Electrochemical device and electronic device

Patent metadata

Field	Value
Publication number	US-2024063502-A1
Application number	US-202318450709-A
Country	US
Kind code	A1
Filing date	Aug 16, 2023
Priority date	Aug 16, 2022
Publication date	Feb 22, 2024
Grant date	—

Abstract

A first sidewall of a housing includes a first wall face and a second wall face. The first sidewall includes a penetrative mounting hole. An insulation assembly is snugly connected to the first wall face or the second wall face. A first insulator includes a penetrative first through-hole. The first through-hole communicates with the mounting hole. An electrode post is disposed in the mounting hole and the first through-hole. When a temperature in an accommodation cavity rises to a first threshold, the first insulator is melted and generates, under an action of a gas pressure in the accommodation cavity of the housing, a pressure relief channel that communicates the accommodation cavity to the outside of the housing. The insulation assembly serves functions of both insulation and pressure relief, thereby not only reducing the material cost, but also improving the energy density of the electrochemical device.

First claim

What is claimed is:

1 . An electrochemical device, comprising:
a housing, wherein the housing defines an accommodation cavity, the housing comprises a first sidewall, the first sidewall comprises a first wall face oriented toward the accommodation cavity and a second wall face oriented away from the accommodation cavity, and the first sidewall comprises a mounting hole that runs through the first wall face and the second wall face; an insulation assembly, snugly connected to the first wall face or the second wall face, the insulation assembly comprises a first insulator, the first insulator comprises a penetrative first through-hole, and the first through-hole communicates with the mounting hole; an electrode post, comprising a first part and a second part, the first part is snugly connected to an end face of the insulation assembly, the end face of the insulation assembly is oriented away from the first sidewall, the first part covers the first through-hole, the second part is disposed in the mounting hole and the first through-hole, one end of the second part is connected to an end face of the first part, and the end face of the first part is oriented toward the first sidewall; and the first insulator is configured to be melted when a temperature in the accommodation cavity rises to a first threshold, and generate, under an action of a gas pressure in the accommodation cavity, a pressure relief channel that communicates the accommodation cavity to an outside of the housing.

2 . The electrochemical device according to claim 1 , wherein the insulation assembly further comprises a second insulator; in a thickness direction of the first sidewall, the first insulator and the second insulator are stacked together; the second insulator comprises a penetrative second through-hole, the penetrative second through-hole communicates with the first through-hole and the mounting hole, and a melting point of the second insulator is higher than the first threshold.

3 . The electrochemical device according to claim 2 , wherein the insulation assembly further comprises a third insulator; in the thickness direction of the first sidewall, the first insulator, the second insulator, and the third insulator are stacked together; the second insulator is disposed between the first insulator and the third insulator; the third insulator comprises a penetrative third through-hole; the penetrative third through-hole communicates with the first through-hole, the penetrative second through-hole, and the mounting hole; and a melting point of the third insulator is lower than the melting point of the second insulator.

4 . The electrochemical device according to claim 3 , wherein a melting point of the first insulator is in the range of 100° C. to 130° C., the melting point of the third insulator is in the range of 100° C. to 130° C., and the melting point of the second insulator is in the range of 140° C. to 190° C.

5 . The electrochemical device according to claim 1 , further comprising a connecting plate, the insulation assembly is connected to the first wall face or the second wall face of the housing through the connecting plate, the connecting plate comprises a fourth through-hole, and the fourth through-hole communicates with the mounting hole and the first through-hole.

6 . The electrochemical device according to claim 5 , wherein the insulation assembly is bonded between the first part and the connecting plate by hot pressing.

7 . The electrochemical device according to claim 1 , wherein the insulation assembly is snugly connected to the first wall face, the second part comprises a protruding portion oriented away from the first part, the protruding portion protrudes from the mounting hole, the protruding portion is located on a side of the first sidewall, and the side of the first sidewall is oriented away from the accommodation cavity.

8 . The electrochemical device according to claim 7 , wherein the protruding portion is bent toward a direction parallel to the second wall face.

9 . The electrochemical device according to claim 1 , wherein, viewed along a direction perpendicular to the first sidewall, the second part is located in a region of the first through-hole and the mounting hole, a first annular clearance is provided between the second part and a wall of the mounting hole, a second annular clearance is provided between the second part and a wall of the first through-hole, and both the first annular clearance and the second annular clearance are disposed around the second part.

10 . The electrochemical device according to claim 9 , wherein the insulation assembly is snugly connected to the first wall face, a first blind hole is created on an end face of the second part, the end face of the second part is oriented away from the first part, and the first blind hole extends toward the first part; or
the insulation assembly is snugly connected to the second wall face, a second blind hole is created on an end face of the first part, the end face of the first part is oriented away from the second part, and the second blind hole extends toward the second part.

11 . The electrochemical device according to claim 3 , wherein, along a direction from the insulation assembly to the first sidewall, a thickness of the second insulator is 50% to 300% of a thickness of the first insulator, and the thickness of the second insulator is 50% to 300% of a thickness of the third insulator.

12 . The electrochemical device according to claim 1 , wherein the electrochemical device satisfies at least one of the following conditions:
along a direction from the insulation assembly to the first sidewall, a thickness of the insulation assembly is 0.05 mm to 1 mm; along a direction from the insulation assembly to the first sidewall, a thickness of the first part is 0.1 mm to 2 mm, and a thickness of the second part is 0.1 mm to 1 mm; or along a thickness direction of the first sidewall in the insulation assembly, a thickness of the first sidewall is 0.05 mm to 0.5 mm.

13 . The electrochemical device according to claim 12 , wherein,
along the direction from the insulation assembly to the first sidewall, the thickness of the insulation assembly is 0.1 mm to 0.3 mm; along the direction from the insulation assembly to the first sidewall, the thickness of the first part is 0.1 mm to 0.5 mm, and the thickness of the second part is 0.1 mm to 0.3 mm; or along a thickness direction of the first sidewall in the insulation assembly, the thickness of the first sidewall is 0.075 mm to 0.2 mm.

14 . The electrochemical device according to claim 2 , wherein the insulation assembly is snugly connected to the first wall face, the second part comprises a protruding portion oriented away from the first part, the protruding portion protrudes from the mounting hole, the protruding portion is located on a side of the first sidewall, and the side is oriented away from the accommodation cavity.

15 . The electrochemical device according to claim 3 , wherein the insulation assembly is snugly connected to the first wall face, the second part comprises a protruding portion oriented away from the first part, the protruding portion protrudes from the mounting hole, the protruding portion is located on a side of the first sidewall, and the side is oriented away from the accommodation cavity.

16 . The electrochemical device according to claim 4 , wherein the insulation assembly is snugly connected to the first wall face, the second part comprises a protruding portion oriented away from the first part, the protruding portion protrudes from the mou

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang Guowen

Classifications

• H01M50/375 Primary

  Vent means sensitive to or responsive to temperature · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M50/198

  characterised by physical properties, e.g. adhesiveness or hardness · CPC title

• H01M50/103 Primary

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title