# US 10,873,109 B2 · Secondary battery, battery pack, electric vehicle, electric power storage system, electric tool, and electronic apparatus

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- Number: US 10,873,109 B2
- Document ID: US10873109B2
- Status: Granted
- Kind: B2
- Application number: 15/993,919
- Filed: 2018-05-31
- Published: 2018-12-06
- Granted: 2020-12-22
- Earliest claimed: 2017-05-31
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Takaaki Matsui; Takashi Kokubun; Kazuki Honda; Taichi Kogure; Naoko Yamakawa
- Web page: https://patentgrep.com/patent/US10873109B2

## CPC

- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- B60L 50/64: Constructional details of batteries specially adapted for electric vehicles
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/139: Processes of manufacture
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries}
- B60K 6/28: characterised by the electric energy storing means, e.g. batteries or capacitors
- B60Y 2200/91: Electric vehicles
- B60Y 2200/92: Hybrid vehicles
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y10S 903/907: Electricity storage, e.g. battery, capacitor
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A secondary battery includes a cathode terminal; an anode terminal; a wound electrode body; and a step reducing member. The step reducing member is attached to one or both of a first cathode wound portion and a first anode wound portion in one or more of a first region, a second region and a third region. The first region is in a major axis direction outside the cathode terminal in a wound direction of a cathode, and the second region is in the major axis direction outside the anode terminal in the wound direction of an anode and the third region between the cathode terminal and the anode terminal.

## Claims

### Claim 1

A secondary battery comprising:
a cathode terminal;
an anode terminal;
a wound electrode body; and
a step reducing member,
wherein
in the wound electrode body,
a cathode and an anode are provided with a separator interposed between the cathode and the anode while being wound around a winding axis;
a section intersecting with the winding axis has a flat shape defined by a major axis and a minor axis;
the cathode includes a cathode current collector and a cathode active material layer provided on a part of the cathode current collector;
the anode includes an anode current collector and an anode active material layer provided on a part of the anode current collector;
the cathode includes an end portion on a wound inner side in a wound direction with a first cathode wound portion that extends in a major axis direction and the cathode terminal is attached to the end portion of the cathode; and
the anode includes an end portion on the wound inner side in the wound direction with a first anode wound portion that extends in the major axis direction while facing the first cathode wound portion across the separator, and the anode terminal is attached to the end portion of the anode and the anode terminal does not overlap with the cathode terminal in a minor axis direction,
wherein the step reducing member is attached to one or both of the first cathode wound portion and the first anode wound portion in one or more of a first region, a second region and a third region,
wherein the first region is in the major axis direction outside the cathode terminal in the wound direction of the cathode, and the second region is in the major axis direction outside the anode terminal in the wound direction of the anode and the third region between the cathode terminal and the anode terminal,
wherein the cathode current collector of the first cathode wound portion includes a first cathode exposed portion in which the cathode active material layer is not provided, and the step reducing member is attached to the first cathode exposed portion, and
wherein a cathode terminal protective member is attached to the first cathode exposed portion and covers the cathode terminal and a periphery of the cathode terminal, and the step reducing member is attached on the cathode terminal protective member.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, wherein
the step reducing member is attached to one or both of an inner peripheral side and an outer peripheral side of the first cathode wound portion, and
the step reducing member is attached to one or both of an inner peripheral side and an outer peripheral side of the first anode wound portion.

### Claim 3 (depends on 1)

The secondary battery according to claim 1, wherein
the anode current collector of the first anode wound portion includes a first anode exposed portion in which the anode active material layer is not provided, and
the step reducing member is attached to the first anode exposed portion.

### Claim 4 (depends on 3)

The secondary battery according to claim 3, wherein
an anode terminal protective member is attached to the first anode exposed portion and covers the anode terminal and a periphery of the anode terminal, and
the step reducing member is attached on the anode terminal protective member.

### Claim 5 (depends on 1)

The secondary battery according to claim 1, wherein
the cathode further includes a second cathode wound portion that is disposed outside the first cathode wound portion in the wound direction of the cathode and extends in the major axis direction while facing the first cathode wound portion across the separator,
the cathode current collector of the second cathode wound portion includes a second cathode exposed portion without the cathode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the second cathode exposed portion.

### Claim 6 (depends on 1)

The secondary battery according to claim 1, wherein
the anode further includes a second anode wound portion that is disposed outside the first anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the first anode wound portion across the separator,
the anode current collector of the second anode wound portion includes a second anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the second anode exposed portion.

### Claim 7 (depends on 6)

The secondary battery according to claim 6, wherein
the anode further includes a third anode wound portion that is disposed outside the second anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the second anode wound portion across the separator,
the anode current collector of the third anode wound portion includes a third anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the third anode exposed portion.

### Claim 8 (depends on 1)

The secondary battery according to claim 1, wherein
the anode further includes a fourth anode wound portion that is disposed inside the first anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the first anode wound portion across the separator,
the anode current collector of the fourth anode wound portion includes a fourth anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the fourth anode exposed portion.

### Claim 9 (depends on 1)

The secondary battery according to claim 1, wherein a ratio of a thickness of the step reducing member to a thickness of each of the cathode terminal and the anode terminal is 15% or more and 80% or less.

### Claim 10 (depends on 1)

The secondary battery according to claim 1, wherein
the step reducing member is disposed in the third region, and
a ratio of a width of the step reducing member to a distance between the cathode terminal and the anode terminal is 50% or more and 90% or less.

### Claim 11 (depends on 1)

The secondary battery according to claim 1, wherein a ratio of a height of the step reducing member to a height of each of the cathode current collector and the anode current collector is 20% or more and 105% or less.

### Claim 12 (depends on 1)

The secondary battery according to claim 1, wherein the step reducing member includes one or more of polypropylene, polyethylene terephthalate and polyimide.

### Claim 13 (depends on 1)

The secondary battery according to claim 1, wherein the secondary battery includes a lithium ion secondary battery.

### Claim 14 (depends on 1)

A battery pack comprising:
the secondary battery according to claim 1;
a controller configured to control operation of the secondary battery; and
a switch configured to switch the operation of the secondary battery according to an instruction from the controller.

### Claim 15 (depends on 1)

An electric vehicle comprising:
the secondary battery according to claim 1;
a converter configured to convert electric power supplied from the secondary battery into a driving force;
a driver configured to drive in accordance with the driving force; and
a controller configured to control operation of the secondary battery.

### Claim 16 (depends on 1)

An electric power storage system comprising:
the secondary battery according to claim 1;
at least one electric apparatus to which electric power is configured to be supplied from the secondary battery; and
a controller configured to control power supply from the secondary battery to the electric apparatus.

### Claim 17 (depends on 1)

An electric tool comprising:
the secondary battery according to claim 1; and
a movable part to which power is configured to be supplied from the secondary battery.

### Claim 18 (depends on 1)

An electronic apparatus comprising the secondary battery according to claim 1 as a power supply source.

### Claim 19

A secondary battery comprising:
a cathode terminal;
an anode terminal;
a wound electrode body; and
a step reducing member,
wherein
in the wound electrode body,
a cathode and an anode are provided with a separator interposed between the cathode and the anode while being wound around a winding axis;
a section intersecting with the winding axis has a flat shape defined by a major axis and a minor axis;
the cathode includes a cathode current collector and a cathode active material layer provided on a part of the cathode current collector;
the anode includes an anode current collector and an anode active material layer provided on a part of the anode current collector;
the cathode includes an end portion on a wound inner side in a wound direction with a first cathode wound portion that extends in a major axis direction and the cathode terminal is attached to the end portion of the cathode; and
the anode includes an end portion on the wound inner side in the wound direction with a first anode wound portion that extends in the major axis direction while facing the first cathode wound portion across the separator, and the anode terminal is attached to the end portion of the anode and the anode terminal does not overlap with the cathode terminal in a minor axis direction,
wherein the step reducing member is attached to one or both of the first cathode wound portion and the first anode wound portion in one or more of a first region, a second region and a third region,
wherein the first region is in the major axis direction outside the cathode terminal in the wound direction of the cathode, and the second region is in the major axis direction outside the anode terminal in the wound direction of the anode and the third region between the cathode terminal and the anode terminal,
wherein the anode current collector of the first anode wound portion includes a first anode exposed portion in which the anode active material layer is not provided, and the step reducing member is attached to the first anode exposed portion, and
wherein an anode terminal protective member is attached to the first anode exposed portion and covers the anode terminal and a periphery of the anode terminal, and the step reducing member is attached on the anode terminal protective member.

### Claim 20 (depends on 19)

The secondary battery according to claim 19, wherein
the step reducing member is attached to one or both of an inner peripheral side and an outer peripheral side of the first cathode wound portion, and
the step reducing member is attached to one or both of an inner peripheral side and an outer peripheral side of the first anode wound portion.

### Claim 21 (depends on 19)

The secondary battery according to claim 19, wherein
the cathode current collector of the first cathode wound portion includes a first cathode exposed portion in which the cathode active material layer is not provided, and
the step reducing member is attached to the first cathode exposed portion.

### Claim 22 (depends on 19)

The secondary battery according to claim 19, wherein
the cathode further includes a second cathode wound portion that is disposed outside the first cathode wound portion in the wound direction of the cathode and extends in the major axis direction while facing the first cathode wound portion across the separator,
the cathode current collector of the second cathode wound portion includes a second cathode exposed portion without the cathode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the second cathode exposed portion.

### Claim 23 (depends on 19)

The secondary battery according to claim 19, wherein
the anode further includes a second anode wound portion that is disposed outside the first anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the first anode wound portion across the separator,
the anode current collector of the second anode wound portion includes a second anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the second anode exposed portion.

### Claim 24 (depends on 23)

The secondary battery according to claim 23, wherein
the anode further includes a third anode wound portion that is disposed outside the second anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the second anode wound portion across the separator,
the anode current collector of the third anode wound portion includes a third anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the third anode exposed portion.

### Claim 25 (depends on 19)

The secondary battery according to claim 19, wherein
the anode further includes a fourth anode wound portion that is disposed inside the first anode wound portion in the wound direction of the anode and extends in the major axis direction while facing the first anode wound portion across the separator,
the anode current collector of the fourth anode wound portion includes a fourth anode exposed portion without the anode active material layer in one or more of the first region, the second region, and the third region, and
the step reducing member is attached to the fourth anode exposed portion.

### Claim 26 (depends on 19)

The secondary battery according to claim 19, wherein a ratio of a thickness of the step reducing member to a thickness of each of the cathode terminal and the anode terminal is 15% or more and 80% or less.

### Claim 27 (depends on 19)

The secondary battery according to claim 19, wherein
the step reducing member is disposed in the third region, and
a ratio of a width of the step reducing member to a distance between the cathode terminal and the anode terminal is 50% or more and 90% or less.

### Claim 28 (depends on 19)

The secondary battery according to claim 19, wherein a ratio of a height of the step reducing member to a height of each of the cathode current collector and the anode current collector is 20% or more and 105% or less.

### Claim 29 (depends on 19)

The secondary battery according to claim 19, wherein the step reducing member includes one or more of polypropylene, polyethylene terephthalate and polyimide.

### Claim 30 (depends on 19)

The secondary battery according to claim 19, wherein the secondary battery includes a lithium ion secondary battery.

### Claim 31 (depends on 19)

A battery pack comprising:
the secondary battery according to claim 19;
a controller configured to control operation of the secondary battery; and
a switch configured to switch the operation of the secondary battery according to an instruction from the controller.

### Claim 32 (depends on 19)

An electric vehicle comprising:
the secondary battery according to claim 19;
a converter configured to convert electric power supplied from the secondary battery into a driving force;
a driver configured to drive in accordance with the driving force; and
a controller configured to control operation of the secondary battery.

### Claim 33 (depends on 19)

An electric power storage system comprising:
the secondary battery according to claim 19;
at least one electric apparatus to which electric power is configured to be supplied from the secondary battery; and
a controller configured to control power supply from the secondary battery to the electric apparatus.

### Claim 34 (depends on 19)

An electric tool comprising:
the secondary battery according to claim 19; and
a movable part to which power is configured to be supplied from the secondary battery.

### Claim 35 (depends on 19)

An electronic apparatus comprising the secondary battery according to claim 19 as a power supply source.