# US 11,909,059 B2 · Battery box

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,909,059 B2
- Document ID: US11909059B2
- Status: Granted
- Kind: B2
- Application number: 17/112,803
- Filed: 2020-12-04
- Published: 2021-03-25
- Granted: 2024-02-20
- Earliest claimed: 2019-08-14
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Tianming Chen; Zhiming Chen
- Web page: https://patentgrep.com/patent/US11909059B2

## CPC

- C09J 175/04: Polyurethanes
- H01M 50/233: characterised by physical properties of casings or racks, e.g. dimensions
- C09J 7/10: without carriers
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 7/385: {Acrylic polymers}
- C09J 11/04: inorganic
- C09J 133/04: Homopolymers or copolymers of esters {(C09J143/04 takes precedence)}
- C09J 163/00: Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C09K 5/14: Solid materials, e.g. powdery or granular
- H01M 10/613: Cooling or keeping cold
- H01M 10/625: Vehicles
- H01M 10/653: characterised by electrically insulating or thermally conductive materials
- H01M 10/6556: Solid parts with flow channel passages or pipes for heat exchange (closed pipes H01M10/6552)
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/124: having a layered structure
- H01M 50/1245: {characterised by the external coating on the casing}
- H01M 50/202: Casings or frames around the primary casing of a single cell or a single battery
- H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells
- H01M 50/209: adapted for prismatic or rectangular cells (H01M50/216 takes precedence)
- H01M 50/229: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64)
- H01M 50/264: for cells or batteries, e.g. straps, tie rods or peripheral frames
- H01M 50/271: Lids or covers for the racks or secondary casings
- C09J 2203/33: for batteries or fuel cells
- C09J 2301/408: additives as essential feature of the adhesive layer
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2463/00: Presence of epoxy resin
- C09J 2475/00: Presence of polyurethane
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

This application discloses a battery box, including a battery case and a plurality of batteries accommodated in the battery case. The batteries are bonded to an inner wall of the battery case by using an adhesive, a coefficient of thermal expansion of the adhesive is α in units of ppm/° C., a coefficient of thermal conductivity of the adhesive is β in units of W/mK, and a ratio of α and β meet a relation of 15≤α/β≤80. In the battery box in this application, the battery case and the plurality of batteries accommodated in the battery case are bonded by using the adhesive. When the coefficient of thermal conductivity of the adhesive matches the coefficient of thermal expansion, heat conduction requirements of the battery box can be satisfied, and the adhesive can also be prevented from cracking or peeling off under heat stress due to alternating temperatures during use of the battery box, thereby improving safety performance of the battery box.

## Claims

### Claim 1

A battery box, comprising a battery case and a plurality of batteries accommodated in the battery case, wherein the batteries are bonded to an inner wall of the battery case by using an adhesive, a coefficient of thermal expansion of the adhesive is α in units of ppm/° C., a coefficient of thermal conductivity of the adhesive is β in units of W/mK, and a ratio of α and β meets a relation of 1.5≤α/β80, wherein each battery comprises a battery housing and an insulation layer, the battery housing has an outer surface, the outer surface further comprises a first surface on a side of the battery housing, the insulation layer is disposed on the outer surface and has an opening, at least a portion of the first surface is exposed from the insulation layer through the opening and bonded to the inner wall of the battery case by using the adhesive, and the opening is smaller than the first surface in size.

### Claim 2 (depends on 1)

The battery box according to claim 1, wherein the ratio of the coefficient of thermal expansion α and the coefficient of thermal conductivity β of the adhesive meets a relation of 25≤α/β≤45, wherein the coefficient of thermal expansion α is in units of ppm/° C. and the coefficient of thermal conductivity β is in units of W/mK.

### Claim 3 (depends on 1)

The battery box according to claim 1, wherein the coefficient of thermal expansion α of the adhesive is 30 ppm/° C. to 55 ppm/° C.; and the coefficient of thermal conductivity β of the adhesive is 0.6 W/mK to 1.9 W/mK.

### Claim 4 (depends on 1)

The battery box according to claim 1, wherein the adhesive comprises a substrate and a filler.

### Claim 5 (depends on 4)

The battery box according to claim 4, wherein the substrate is selected from the group consisting of polyurethane, acrylic acid, and epoxy resin, or any combination thereof; a percentage of the substrate in the adhesive by weight is 30% to 90%; the filler is aluminum oxide or boron nitride, and a percentage of the filler in the adhesive by weight is 10% to 70%.

### Claim 6 (depends on 4)

The battery box according to claim 4, wherein a particle size of the filler is 10 micrometers to 80 micrometers.

### Claim 7 (depends on 1)

The battery box according to claim 1, wherein a thickness of the adhesive is 0.5 millimeters to 1.5 millimeters.

### Claim 8 (depends on 1)

The battery box according to claim 1, wherein an electrode assembly is accommodated in the battery housing, a battery top cover is hermetically connected to the battery housing, an electrode terminal is disposed on the battery top cover, and an electrode terminal is electrically connected to the electrode assembly.

### Claim 9 (depends on 8)

The battery box according to claim 8, wherein the battery housing is made of a metal material, and the insulation layer is an insulation film wrapping the outer surface.

### Claim 10 (depends on 1)

The battery box according to claim 1, wherein an area of the opening of the insulation layer is A1, an area of the first surface is A2, and a ratio of A1 to A2 meets 30%≤A1/A2≤80%.

### Claim 11 (depends on 8)

The battery box according to claim 8, wherein the battery housing is made of a metal material, and the insulation layer is an insulation coating coated onto the outer surface.

### Claim 12 (depends on 1)

The battery box according to claim 1, wherein the battery case comprises a lower case and a box cover that is hermetically connected to the lower case; and the batteries are bonded to an inner wall of the lower case by using the adhesive, and/or the batteries are bonded to an inner wall of the box cover by using the adhesive.

### Claim 13 (depends on 12)

The battery box according to claim 12, wherein the lower case comprises a base plate and a side plate that encloses a periphery of the base plate, and the batteries are bonded to the base plate of the lower case by using the adhesive.

### Claim 14 (depends on 13)

The battery box according to claim 13, wherein the lower case further comprises a fixing plate, the fixing plate is fixedly connected to the base plate or the side plate, and the batteries are bonded to the fixing plate of the lower case by using the adhesive.

### Claim 15 (depends on 14)

The battery box according to claim 14, wherein a fluid passage is provided in the fixing plate, and the fluid passage contains a heat transfer fluid.

### Claim 16 (depends on 12)

The battery box according to claim 12, wherein the box cover comprises a top plate and a surrounding plate that encloses a periphery of the top plate, and the batteries are bonded to the top plate of the box cover by using the adhesive.

### Claim 17

An apparatus, comprising a battery box configured to supply electric energy to the apparatus, the battery box comprising a battery case and a plurality of batteries accommodated in the battery case, wherein the batteries are bonded to an inner wall of the battery case by using an adhesive, a coefficient of thermal expansion of the adhesive is α in units of ppm/° C., a coefficient of thermal conductivity of the adhesive is β in units of W/mK, and a ratio of α and β meets a relation of 1.5≤α/β80, wherein each battery comprises a battery housing and an insulating insulation layer, the battery housing has an outer surface, the outer surface further comprises a first surface on a side of the battery housing, the insulation layer is disposed on the outer surface and has an opening, at least a portion of the first surface is exposed from the insulation layer through the opening and bonded to the inner wall of the battery case by using the adhesive, and the opening is smaller than the first surface in size.