Battery box

Patent metadata

Field	Value
Publication number	US-11909059-B2
Application number	US-202017112803-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Aug 14, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

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.

First claim

What is claimed is:

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.

2. 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.

3. 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.

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

5. 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%.

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

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

8. 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.

9. 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.

10. 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%.

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.

16. 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.

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.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Chen Tianming
• Chen Zhiming

Classifications

• H01M50/233 Primary

  characterised by physical properties of casings or racks, e.g. dimensions · CPC title

• C09J7/10

  without carriers · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• C09J7/385

  Acrylic polymers · CPC title

• C09J11/04 Primary

  inorganic · CPC title