Battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-11894510-B2
Application number	US-202218080082-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Jun 27, 2019
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A battery pack and a vehicle, wherein the battery pack includes a box assembly, a battery unit, a constraint component and an outer cover, the box assembly includes a box body and a fixed beam, the fixed beam is fixed in the box body; the battery unit is arranged in the box body; the constraint component covers the battery unit and is fixed with the fixed beam; and the outer cover is arranged on one side of the constraint component away from the box body to seal an open end of the box body.

First claim

What is claimed is:

1. A battery pack, comprising:
a box assembly; and
a plurality of battery units arranged in the box assembly, wherein the battery units are divided into a plurality of battery unit groups;

wherein the box assembly comprises:
a box body; and
a plurality of fixed beams arranged in parallel in the box body, wherein one or more battery unit groups are placed between two fixed beams;
a plurality of constraint components, wherein each constrain component covers the one or more battery unit groups placed between the two fixed beams, and is attached to the two fixed beams; and
an outer cover attached to the box body, covering the constraint components;

wherein each battery unit comprises:
a shell; and
an electrode assembly arranged in the shell;

wherein the electrode assembly comprises a first pole piece, a second pole piece, and a diaphragm arranged between the first pole piece and the second ole piece; and
wherein
the electrode assembly is of a wound structure and is flat, the outer surface of the electrode assembly comprises two flat surfaces, and the two flat surfaces are oppositely arranged along a height direction of the battery pack; or
the electrode assembly is of a laminated structure, and the first pole piece and the second pole piece are stacked along a height direction of the battery pack.

2. The battery pack according to claim 1 , wherein each of the battery unit groups has at least two battery units.

3. The battery pack according to claim 1 , wherein the plurality of battery units are divided into several battery unit groups along a length direction of the battery pack, and the fixed beam extends along a width direction of the battery pack.

4. The battery pack according to claim 1 , wherein the plurality of battery units are divided into several battery unit groups along a width direction of the battery pack, and the fixed beam extends along a length direction of the battery pack.

5. The battery pack according to claim 1 , wherein the constraint components respectively cover different groups of the battery units.

6. The battery pack according to claim 5 , wherein each constraint component comprises:
a limiting portion covering the same group of battery units; and
two mounting portions, respectively connected to the both sides of the limiting portion along a grouping direction of the battery units,

wherein the two mounting portions are respectively fixed with the fixed beams on the both sides of the same group of battery units.

7. The battery pack according to claim 6 , wherein the limiting portion protrudes relative to the mounting portion toward a direction away from the battery units.

8. The battery pack according to claim 6 , wherein there is only one fixed beam arranged between two adjacent groups of battery units, each of the two adjacent mounting portions fixed with the fixed beam comprises a plurality of mounting blocks, the plurality of mounting blocks are arranged along an extension direction of the fixed beam at intervals, and the plurality of mounting blocks of the two adjacent mounting portions are alternately arranged.

9. The battery pack according to claim 1 , wherein at least one constraint component is of a split structure covering at least part of the surface of the corresponding battery units.

10. The battery pack according to claim 1 , wherein there is a gap between an inner surface of the outer cover and an outer surface of the constraint components.

11. The battery pack according to claim 10 , wherein the gap ranges from 2 mm to 100 mm.

12. The battery pack according to claim 6 , wherein the box assembly further comprises:
a depression bar and a fastener,

wherein the mounting portions are arranged between the depression bar and the fixed beam, and the fastener passes through the depression bar and the mounting portions, and is fixed with the fixed beam to fix the mounting portions to the fixed beam.

13. The battery pack according to claim 1 , further comprising a sealing member, wherein the sealing member is arranged between the outer cover and the box body to seal the open end of the box body.

14. The battery pack according to claim 1 , wherein a bonding layer is arranged between the battery units on the bottommost layer and an inner bottom surface of the box body.

15. The battery pack according to claim 1 , wherein a bonding layer is arranged between two adjacent battery units in each group of battery units.

16. The battery pack according to claim 1 , wherein a bonding layer is arranged between the constraint component and the battery units on the topmost layer.

17. A vehicle, comprising:
the battery pack according to claim 1 ; and
a vehicle body provided with the battery pack.

18. A device powered by a secondary battery, wherein the secondary battery comprises the battery pack according to claim 1 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• You Kaijie
• Wang Yongguang
• Tang Yu
• Lin Weilong
• Ma Jun

Classifications

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/20

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title

• H01M50/249

  specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) · CPC title

• H01M50/271

  Lids or covers for the racks or secondary casings · CPC title