Cap assembly of power battery

Patent metadata

Field	Value
Publication number	US-2016204397-A1
Application number	US-201614989516-A
Country	US
Kind code	A1
Filing date	Jan 6, 2016
Priority date	Jan 12, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A cap assembly of a power battery comprises: a cap plate, a first electrode terminal provided to the cap plate, a second electrode terminal provided to the cap plate and electrically insulated from the cap plate, and a resistance member electrically connected to the cap plate and the first electrode terminal. The resistance member comprises: a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and a heat-resistant metal layer provided to the heat-resistant insulating base body. The heat-resistant metal layer and the cap plate and the first electrode terminal are electrically connected to form a conductive path, the conductive path passes along the heat-resistant insulating base body positioned between the cap plate and the first electrode terminal. The formed conductive path is a curved path, therefore the resistance value of the resistance member can be controlled by controlling the conductive path.

First claim

What is claimed is:

1 . A cap assembly of a power battery, comprising:
a cap plate; a first electrode terminal provided to the cap plate; a second electrode terminal provided to the cap plate and electrically insulated from the cap plate; and a resistance member electrically connected to the cap plate and the first electrode terminal; the resistance member comprising: a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and a heat-resistant metal layer provided to the heat-resistant insulating base body; the heat-resistant metal layer, the cap plate and the first electrode terminal being electrically connected to form a conductive path, the conductive path passing along the heat-resistant insulating base body positioned between the cap plate and the first electrode terminal.

2 . The cap assembly of the power battery according to claim 1 , wherein the cap assembly of the power battery further comprises:
a circlip positioned above the heat-resistant insulating base body of the resistance member, clipped to and electrically connected to the first electrode terminal, and electrically connected to the heat-resistant metal layer of the resistance member.

3 . The cap assembly of the power battery according to claim 1 , wherein the cap assembly of the power battery further comprises:
a connecting block positioned above the heat-resistant insulating base body of the resistance member, fixed to and electrically connected to the first electrode terminal, and electrically connected to the heat-resistant metal layer of the resistance member.

4 . The cap assembly of the power battery according to claim 1 , wherein the resistance member further comprises: a base body conductor provided to the heat-resistant insulating base body;
the number of the heat-resistant insulating base bodies is at least one; each heat-resistant insulating base body is provided with a receiving hole, and an upper side and a lower side of each heat-resistant insulating base body along an axial direction each are provided with one heat-resistant metal layer; the number of the base body conductors is greater than or equal to the number of the heat-resistant insulating base bodies, each base body conductor is inserted into the receiving hole of the corresponding heat-resistant insulating base body and is electrically connected to the two heat-resistant metal layers respectively provided on the upper side and the lower side of the corresponding heat-resistant insulating base body along the axial direction; when the number of the heat-resistant insulating base bodies is more than one, all the heat-resistant insulating base bodies are provided along a vertical direction, and two adjacent heat-resistant insulating base bodies along the vertical direction share one heat-resistant metal layer provided between the two adjacent heat-resistant insulating base bodies; all the base body conductors, all the heat-resistant metal layers, the cap plate and the first electrode terminal are electrically connected to form the conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal.

5 . The cap assembly of the power battery according to claim 4 , wherein the resistance member further comprises:
a metal coating provided along the vertical direction and electrically connected to an outer side of the heat-resistant metal layer positioned at an outermost side of the resistance member along the vertical direction; all the base body conductors, all the heat-resistant metal layers, all the metal coatings, the cap plate and the first electrode terminal are electrically connected to form the conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal.

6 . The cap assembly of the power battery according to claim 5 , wherein the metal coating is provided with a recessed groove, the recessed groove receives the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction.

7 . The cap assembly of the power battery according to claim 5 , wherein the resistance member further comprises:
an insulative piece correspondingly provided along the vertical direction, provided between the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction and the corresponding metal coating, and provided with an accommodating hole; and an insulative piece conductor inserted into the accommodating hole of the insulative piece and electrically connected to the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction and the corresponding metal coating; all the base body conductors, all the heat-resistant metal layers, all the metal coatings, all the insulative piece conductors, the cap plate and the first electrode terminal are electrically connected to form the conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal.

8 . The cap assembly of the power battery according to claim 7 , wherein the insulative piece is provided with a recessed portion receiving the corresponding heat-resistant metal layer.

9 . The cap assembly of the power battery according to claim 1 , wherein
the number of the heat-resistant insulating base bodies is at least one; a circumferential side of each heat-resistant insulating base body is provided with the heat-resistant metal layer; the heat-resistant metal layer provided at the circumferential side of each heat-resistant insulating base body surrounds the each heat-resistant insulating base body, and when the number of the heat-resistant insulating base bodies is more than one, all the heat-resistant metal layers each provided at the circumferential side of the corresponding heat-resistant insulating base body are electrically connected together; all the heat-resistant metal layers each provided at the circumferential side of the corresponding heat-resistant insulating base body, the cap plate and the first electrode terminal are electrically connected to form the conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal.

10 . The cap assembly of the power battery according to claim 9 , wherein the resistance member further comprises:
an insulating layer, the number of the insulating layers corresponds to the number of the heat-resistant insulating base bodies, each insulating layer surrounds a circumferential side of the corresponding heat-resistant metal layer so as to make each heat-resistant metal layer provided between one corresponding heat-resistant insulating base body and one corresponding insulating layer.

11 . The cap assembly of the power battery according to claim 10 , wherein
the resistance member further comprises an interconnect conductor; the number of the heat-resistant insulating base bodies is at least two, two adjacent heat-resistant insulating base bodies each are provided with a receiving portion, the two receiving portions face each other; the interconnect conductor is received in the two receiving portions of the two adjacent heat-resistant insulating base bodies and electrically connected to the heat-resistant metal layers each positioned at the circumferential side of corresponding one of the two adjacent heat-resistant insulating base bodies; all the heat-resistan

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Cai Rulai
• Li Quankun
• Wang Peng
• Deng Pinghua
• Yu Peng

Classifications

• H01M50/147 Primary

  Lids or covers · CPC title

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M2/0404

  Electricity · mapped topic