Battery pack, battery pack manufacturing method, and electric device

Patent metadata

Field	Value
Publication number	US-2024405317-A1
Application number	US-202418679961-A
Country	US
Kind code	A1
Filing date	May 31, 2024
Priority date	Dec 2, 2021
Publication date	Dec 5, 2024
Grant date	—

Abstract

A battery pack includes a housing assembly, a cell assembly, a first circuit board, a first heat sink, a first structural member, and a first insulator. The cell assembly includes a cell. The cell includes a cell housing, an electrode assembly, and an electrode terminal connected to the electrode assembly and led out from the cell housing. The first circuit board is disposed in the housing assembly and connected to the electrode terminal. The first heat sink is disposed in the housing assembly. The first structural member is disposed between the first circuit board and the first heat sink. An outer surface of the first structural member is provided with an insulating material. At least a part of the first insulator is disposed between the first structural member and the first heat sink, and the first structural member and the first heat sink are bonded by the first insulator.

First claim

What is claimed is:

1 . A battery pack, comprising:
a housing assembly; a cell assembly disposed in the housing assembly and comprising a cell; wherein the cell comprises a cell housing, an electrode assembly disposed in the cell housing, and an electrode terminal connected to the electrode assembly and led out from the cell housing; a first circuit board disposed in the housing assembly and connected to the electrode terminal; a first heat sink disposed in the housing assembly; a first structural member disposed between the first circuit board and the first heat sink, an outer surface of the first structural member is provided with an insulating material; and a first insulator, wherein at least a part of the first insulator is disposed between the first structural member and the first heat sink, and the first structural member and the first heat sink are bonded by the first insulator.

2 . The battery pack according to claim 1 , wherein the first insulator is formed by a solidified fluid insulating material injected into the battery pack.

3 . The battery pack according to claim 1 , wherein the housing assembly, the cell assembly, the first circuit board, the first structural member, and the first heat sink are bonded by the first insulator.

4 . The battery pack according to claim 1 , wherein the first insulator covers a part of the electrode terminal outside the cell housing.

5 . The battery pack according to claim 1 , wherein the cell housing comprises a first section and a second section, the first section accommodates the electrode assembly, the second section is connected to the first section, the electrode terminal extends out of the second section, and the first insulator covers at least a part of the second section.

6 . The battery pack according to claim 1 , wherein the housing assembly is provided with a first through-hole and a second through-hole, and the first heat sink is provided with a first passage communicating with the first through-hole and the second through-hole.

7 . The battery pack according to claim 1 , wherein the first heat sink is provided with a first insulation portion, the first insulation portion being disposed between an inner surface of the housing assembly and the first heat sink.

8 . The battery pack according to claim 6 , wherein the housing assembly comprises a first housing, the first housing encloses a first space, and the first heat sink is disposed in the first space;
the first housing comprises a first wall, a second wall, a third wall, and a fourth wall; the first wall and the second wall are opposite to each other in a first direction, the third wall and the fourth wall are opposite to each other in a second direction, and the first heat sink is connected to inner surfaces of the first wall, the second wall, the third wall, and the fourth wall.

9 . The battery pack according to claim 8 , wherein the first through-hole is provided on the first wall and the second through-hole is provided on the second wall.

10 . The battery pack according to claim 8 , further comprising a connecting bracket, wherein the housing assembly further comprises a second housing, a second circuit board is disposed in the second housing, the first housing and the second housing are connected to the connecting bracket, and the connecting bracket is disposed between the second circuit board and the first heat sink.

11 . The battery pack according to claim 10 , wherein the connecting bracket is provided with a bracket through-hole, a second space is formed between the connecting bracket and the first heat sink, and the bracket through-hole communicates with the second space.

12 . A battery pack, comprising:
a housing assembly; a cell assembly disposed in the housing assembly and comprising a plurality of cells; wherein each cell comprises a cell housing, an electrode assembly disposed in the cell housing, and an electrode terminal connected to the electrode assembly and led out from the cell housing, the electrode terminal comprises a welding portion, and welding portions of adjacent cells overlap; a first circuit board disposed in the housing assembly and connected to the welding portion; a first heat sink connected to an inner surface of the housing assembly, wherein the first circuit board and the first heat sink are arranged along a third direction; a first structural member disposed between the first circuit board and the first heat sink, wherein an outer surface of the first structural member is provided with an insulating material, and the first structural member is provided with a fourth communicating hole; along the third direction, a projection of a part of the welding portions of adjacent cells and a projection of the fourth communicating hole overlap; and a first insulator, at least partially located between the first structural member and the first heat sink and at least partially disposed in the fourth communicating hole.

13 . The battery pack according to claim 12 , wherein a fluid insulating material flows in between the first structural member and the first heat sink through the fourth communicating hole and forms the first insulator.

14 . The battery pack according to claim 12 , wherein the first circuit board is further provided with a plurality of first communicating holes, the first communicating holes run through the first circuit board along the third direction, and the first communicating holes allow the first insulator to flow into the battery pack.

15 . The battery pack according to claim 12 , wherein the electrode terminal comprises a first terminal and a second terminal, the first terminal and the second terminal being opposite in polarity, wherein one of the first terminal or the second terminal is a positive electrode terminal and the other one is a negative electrode terminal; and
the first circuit board is provided with a plurality of sets of holes, each set of holes comprises a first hole and a second hole, the first hole and the second hole being arranged along a first direction, the first hole and the second hole extend along a second direction; a first terminal of one of adjacent cells runs through the first hole and a second terminal of the other one of the adjacent cells runs through the second hole, and a welding portion of the first terminal and a welding portion of the second terminal are stacked and then connected to the first circuit board, the first direction is perpendicular to both the second direction and the third direction.

16 . The battery pack according to claim 15 , wherein the first circuit board is provided with a plurality of first conductive sheets, the first conductive sheet being connected to the first circuit board;
a first terminal of one of the adjacent cells runs through the first hole and a second terminal of the other one of the adjacent cells runs through the second hole, and a welding portion of the first terminal and a welding portion of the second terminal are stacked and then welded to the first conductive sheet.

17 . The battery pack according to claim 16 , wherein each set of holes further comprises a third hole, when viewed along the third direction, the third hole is located between the first hole and the second hole;
a projection of the third hole along the third direction is located within a projection of the first conductive sheet along the third direction.

18 . The battery pack according to claim 15 , wherein the housing assembly is provided with a first through-hole and a second through-hole, and the first heat sink is

Assignees

• Dongguan Poweramp Tech Limited

Inventors

• Peng Fanggui
• Yang Dian
• Hu cheng dong
• Yang Pengcheng

Classifications

• H01M10/6562

  with free flow by convection only · CPC title

• H01M10/653

  characterised by electrically insulating or thermally conductive materials · CPC title

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title

• H01M50/516

  by welding, soldering or brazing · CPC title

• H01M50/289

  characterised by spacing elements or positioning means within frames, racks or packs (spacing elements inside cells other than separators, membranes or diaphragms H01M50/471) · CPC title