# US 11,309,590 B2 · Battery pack with improved assembly structure

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- Number: US 11,309,590 B2
- Document ID: US11309590B2
- Status: Granted
- Kind: B2
- Application number: 16/606,060
- Filed: 2018-11-06
- Published: 2020-06-18
- Granted: 2022-04-19
- Earliest claimed: 2017-11-06
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hee-Yong Kwon; Jun-Yeob Seong
- Web page: https://patentgrep.com/patent/US11309590B2

## CPC

- B60L 50/64: Constructional details of batteries specially adapted for electric vehicles
- H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)}
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H01M 50/211: adapted for pouch cells
- H01M 50/262: with fastening means, e.g. locks
- H01M 50/271: Lids or covers for the racks or secondary casings
- H01M 50/284: with incorporated circuit boards, e.g. printed circuit boards [PCB]
- H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543)
- H01M 50/503: characterised by the shape of the interconnectors
- H01M 50/569: Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364)
- H01M 50/574: Devices or arrangements for the interruption of current
- B60L 2240/547: Voltage
- B60L 2240/549: Current
- G01R 1/20: Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection
- 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
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- 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
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The battery pack includes a cell module assembly that includes battery cells arranged to be stacked, a cell case accommodating the battery cells, and first positive and negative electrode bus bars electrically connected to the battery cells. The battery pack further includes a battery management system (BMS) assembly that includes a BMS circuit board, a current sensor unit vertically disposed at an edge of the BMS circuit board, and a BMS housing that supports the BMS circuit board. Further, the battery pack includes a pack cover that includes positive and negative electrode terminals and second positive and negative electrode bus bars electrically connected to the positive and negative electrode terminals. The pack cover is configured to cover an upper portion of the BMS housing, and the first negative electrode bus bar and the second negative electrode bus bar respectively have one end vertically connected to the current sensor unit.

## Claims

### Claim 1

A battery pack, comprising:
a cell module assembly that includes:
battery cells arranged to be stacked;
a cell case accommodating the battery cells; and
a first positive electrode bus bar and a first negative electrode bus bar that are electrically connected to the battery cells, wherein an end of the first positive electrode bus bar and an end of the first negative electrode bus bar extend in a longitudinal direction to a location outside of the cell case;
a battery management system (BMS) assembly that includes:
a BMS circuit board;
a current sensor unit disposed at an edge of the BMS circuit board, the current sensor unit having a planar surface in the longitudinal direction; and
a BMS housing that supports the BMS circuit board, wherein a lower portion of the BMS housing is coupled to the cell case; and
a pack cover that includes:
a positive electrode terminal and a negative electrode terminal; and
a second positive electrode bus bar and a second negative electrode bus bar that are electrically connected to the positive electrode terminal and the negative electrode terminal, respectively,
wherein the second negative electrode bus bar is connected to the current sensor unit,
wherein the pack cover is configured to cover an upper portion of the BMS housing,
wherein when the cell module assembly is moved in the longitudinal direction relative to the BMS assembly, the end of the first negative electrode bus bar is arranged to directly engage the current sensor unit.

### Claim 2 (depends on 1)

The battery pack according to claim 1, wherein the current sensor unit includes:
a shunt formed as a plate-shaped metal resistor connected to the first negative electrode bus bar and the second negative electrode bus bar and having a bolt aperture formed at each end thereof; and
a shunt support member configured to clamp the shunt, wherein the shunt support member is fixedly coupled onto the BMS circuit board.

### Claim 3 (depends on 2)

The battery pack according to claim 2, wherein the BMS circuit board has a shunt installation portion formed at one side of the edge thereof and screw-fastened to the shunt support member, and
wherein both side portions of the BMS circuit board with respect to the shunt installation portion are cut out to form an empty space at least by a length of the shunt.

### Claim 4 (depends on 3)

The battery pack according to claim 3, wherein the shunt support member includes:
a clamping portion formed as a slot into which a center portion of the shunt is inserted; and
a mounting portion attached to the shunt installation portion to surround an end of the shunt installation portion.

### Claim 5 (depends on 4)

The battery pack according to claim 4, wherein the mounting portion has an assembling guide pin that extends at a lower surface thereof, and the shunt installation portion has a guide pin aperture into which the assembling guide pin is inserted.

### Claim 6 (depends on 3)

The battery pack according to claim 3, wherein the BMS housing has a horizontal surface on which the BMS circuit board is disposed, and a nut support member is provided at the horizontal surface to support a nut to allow the nut to be disposed at a rear of the bolt aperture of the shunt.

### Claim 7 (depends on 4)

The battery pack according to claim 4, wherein a horizontal surface of the BMS housing has a bus bar access portion formed by opening a lower portion thereof below the shunt to allow the first negative electrode bus bar to be directly coupled to the shunt at a location directly below the shunt.

### Claim 8 (depends on 1)

The battery pack according to claim 1, wherein the pack cover and the BMS housing have a first hooking aperture and a first hooking protrusion, respectively, provided to be snap-fitted with each other along outer peripheries thereof, and
wherein the BMS housing and the cell case have a second hooking aperture and a second hooking protrusion, respectively, provided to be snap-fitted with each other along outer peripheries thereof.

### Claim 9 (depends on 1)

The battery pack according to claim 1, wherein the BMS housing further includes at least one leg formed at a lower surface of the BMS housing to extend downward in the longitudinal direction by a predetermined length, and
wherein the cell case includes a leg insert groove into which the at least one leg is inserted and coupled in one-to-one relationship.

### Claim 10 (depends on 9)

The battery pack according to claim 9, wherein an insertion depth of the leg into the leg insert groove is restricted to allow the BMS housing to be supported and spaced apart from the battery cells with a predetermined interval.

### Claim 11 (depends on 2)

The battery pack according to claim 2, wherein outer peripheries of the BMS housing and the pack cover that correspond to each other in the longitudinal direction are partially recessed to form a fastening window therebetween when the BMS housing and the pack cover are coupled,
wherein the fastening window provides a space in which the first negative electrode bus bar and the second negative electrode bus bar are bolted to both ends of the shunt.

### Claim 12 (depends on 1)

The battery pack according to claim 1, wherein the pack cover has a ridge portion formed to be convex toward an outer direction and includes a space in the ridge portion to allow a current breaking unit configured to obstruct an electric current of the battery cells to be mounted within the ridge portion.

### Claim 13 (depends on 1)

A vehicle, comprising the battery pack according to claim 1.