# US 12,224,457 B2 · Secondary battery

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- Number: US 12,224,457 B2
- Document ID: US12224457B2
- Status: Granted
- Kind: B2
- Application number: 17/506,792
- Filed: 2021-10-21
- Published: 2022-02-10
- Granted: 2025-02-11
- Earliest claimed: 2019-04-25
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Naoto Akizuki; Masahiro Otsuka; Morimichi Ozaki
- Web page: https://patentgrep.com/patent/US12224457B2

## CPC

- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/463: Separators, membranes or diaphragms characterised by their shape
- H01M 50/474: characterised by their position inside the cells
- H01M 50/477: characterised by their shape
- H01M 50/543: Terminals
- H01M 50/545: formed by the casing of the cells (cup shaped terminals adapted for cells having curved cross-section H01M50/56)
- H01M 50/55: on the same side of the cell
- H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells
- H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes
- H01M 50/593: Spacers; Insulating plates
- H01M 2004/026: {characterised by the polarity}
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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

## Abstract

Provided is a secondary battery including an electrode assembly and an electrolyte enclosed in an exterior case. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The secondary battery includes a spacer positioned between the electrode assembly and an exterior case, and the electrode assembly includes current collecting tabs of a positive electrode and a negative electrode each protruding from the same end face. The spacer is positioned between an end face, of the electrode assembly, from which the current collecting tab protrudes and the exterior case, and at least one of the current collecting tabs of the positive electrode or the negative electrode has a bent shape between the electrode assembly and the spacer.

## Claims

### Claim 1

A secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte enclosed in an exterior case, wherein
the secondary battery includes a spacer positioned between the electrode assembly and the exterior case, wherein
the electrode assembly includes current collecting tabs of the positive electrode and the negative electrode each protruding from a same end face of the electrode assembly, wherein
the spacer is positioned between an end face of the electrode assembly, from which the current collecting tabs each protrude, and the exterior case, wherein
at least one of the current collecting tabs of the positive electrode or the negative electrode has a bent shape between the electrode assembly and the spacer, wherein
the electrode assembly has a separator extension portion in which the separator extends outward of the positive electrode and the negative electrode at the end face from which the current collecting tabs each protrude, and a portion having the bent shape of each of the current collecting tabs is in contact with the separator extension portion, wherein
the electrode assembly includes a wound electrode assembly, and the positive electrode, the negative electrode, and the separator are wound, wherein
at least part of the separator extension portion has a bent shape convex toward an outer periphery of the wound electrode assembly, and wherein
the electrode assembly has a convergence portion at which the separator extension portion converges, and a portion having the bent shape of the at least one current collecting tab is in contact with the convergence portion.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, wherein the bent shape between the electrode assembly and the spacer includes a bowed shape bent in an arch shape.

### Claim 3 (depends on 1)

The secondary battery according to claim 1, wherein the current collecting tabs extend to meander in sectional view in a separation space between the electrode assembly and the spacer.

### Claim 4 (depends on 1)

The secondary battery according to claim 1, wherein the portion having the bent shape of the at least one current collecting tab is in contact with the spacer.

### Claim 5 (depends on 1)

The secondary battery according to claim 1, wherein the current collecting tabs extend from a face, of the spacer, toward the electrode assembly to a face of the spacer toward the exterior case to straddle opposing faces of the spacer.

### Claim 6 (depends on 5)

The secondary battery according to claim 5, wherein the at least one current collecting tab extends to be in contact with the opposing faces of the spacer.

### Claim 7 (depends on 1)

The secondary battery according to claim 1, wherein between the electrode assembly and the spacer, at least one of the current collecting tabs is in contact with both the spacer and the separator.

### Claim 8 (depends on 7)

The secondary battery according to claim 7, wherein at least two bent portions of the at least one current collecting tab are provided, and wherein one of the bent portions of the at least one current collecting tab is in contact with the spacer, and wherein the other of the bent portions of the at least one current collecting tab is in contact with the separator.

### Claim 9 (depends on 1)

The secondary battery according to claim 1, wherein an insulating material is provided at least at a portion having the bent shape in each of the current collecting tabs.

### Claim 10 (depends on 1)

The secondary battery according to claim 1, wherein at least one current collecting tab extends in a meandering manner while being in contact with the separator of the electrode assembly and the spacer in a separation space between the electrode assembly and the spacer, and extends further outward beyond the spacer.

### Claim 11 (depends on 10)

The secondary battery according to claim 10, wherein the exterior case further includes an electrode terminal structure of one of a positive electrode terminal and a negative electrode terminal, and part of each of the current collecting tabs is positioned between the spacer and the electrode terminal structure.

### Claim 12 (depends on 11)

The secondary battery according to claim 11, wherein the exterior case is a conductive case type exterior case, and assumes a charge whose polarity is opposite to a polarity of the electrode terminal structure.

### Claim 13 (depends on 1)

The secondary battery according to claim 1, wherein the positive electrode and the negative electrode are capable of absorbing and releasing lithium ions.

### Claim 14 (depends on 1)

The secondary battery according to claim 1, wherein the secondary battery is included in a mobile device.

### Claim 15 (depends on 1)

The secondary battery according to claim 1, wherein the portion having the bent shape of at least one of the current collecting tabs bends in a different shape than the at least part of the separator extension portion having a bent shape.

### Claim 16 (depends on 1)

The secondary battery according to claim 1, wherein at least one of the current collecting tabs includes an area approaching the separator and an area away from the separator.

### Claim 17 (depends on 1)

The secondary battery according to claim 1, wherein at least one of the current collecting tabs includes an area configured to project toward the separator.