Search

CN-122029681-A - Battery cell, battery device and electricity utilization device

CN122029681ACN 122029681 ACN122029681 ACN 122029681ACN-122029681-A

Abstract

A battery unit (12), a battery device (100) and an electric device belong to the technical field of batteries. The battery cell (12) includes a housing (121), an electrolyte, an electrode assembly (122), a pressure relief member (125), and a barrier (12), the housing (121) includes a first wall (1210), and the first wall (1210) is provided with a pressure relief hole (126). An electrolyte is disposed within the housing (121). The electrode assembly (122) is disposed within the housing (121). The pressure release part (125) covers the pressure release hole (126), and the pressure release part (125) is in sealing connection with the first wall (1210) to form the connecting part (130). The barrier (12) is connected to the first wall (1210) and the pressure relief member (125) and covers the connection (130). The battery cell (12) has high reliability.

Inventors

  • ZHOU WENLIN
  • WU NINGSHENG
  • XIE YONGFENG
  • ZHENG YULIAN
  • WANG PENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20240729

Claims (20)

  1. A battery cell, comprising: a housing comprising a first wall provided with a pressure relief aperture; An electrolyte disposed within the housing; An electrode assembly disposed within the housing; The pressure release part covers the pressure release hole and is in sealing connection with the first wall to form a connecting part; and a blocking member connected with the first wall and the pressure release member and covering the connection portion.
  2. The battery cell of claim 1, further comprising an insulator positioned between the first wall and the electrode assembly in a thickness direction of the first wall; the blocking member is connected to the insulating member.
  3. The battery cell of claim 2, wherein the insulator has a receiving groove disposed opposite the connecting portion, and at least a portion of the barrier is disposed in the receiving groove.
  4. The battery cell of claim 3, wherein the receiving groove is an annular groove extending in a circumferential direction of the pressure relief hole.
  5. The battery cell according to claim 3 or 4, wherein the receiving groove includes a first groove section, a second groove section, and a third groove section connected in sequence in a thickness direction of the first wall; The second slot segment has a width less than the width of the first slot segment and less than the width of the third slot segment.
  6. The battery cell of any one of claims 3-5, wherein the insulator comprises a boss having a first end face facing the connection portion, the receiving groove being provided in the first end face.
  7. The battery cell according to claim 6, wherein the boss abuts the pressure release member in a thickness direction of the first wall, and a gap exists between the boss and the first wall.
  8. The battery cell according to claim 6 or 7, wherein the orthographic projection of the boss falls within the orthographic projection range of the first wall in the same projection plane perpendicular to the thickness direction of the first wall.
  9. The battery cell according to any one of claims 6 to 8, wherein a projection of an inner peripheral surface of the pressure release hole is located inside a projection of a surface of the boss facing the pressure release hole in the same projection plane perpendicular to a thickness direction of the first wall; Along the radial direction of the pressure relief hole, the minimum distance between the surface of the boss and the inner peripheral surface of the pressure relief hole is D, and D is more than or equal to 0.5mm and less than or equal to 4mm.
  10. The battery cell of any one of claims 6-9, wherein the boss is provided in a plurality, the plurality of bosses being spaced circumferentially about the pressure relief aperture.
  11. The battery cell according to any one of claims 6-10, wherein the boss is an annular boss provided with a channel extending through a peripheral wall of the annular boss in a radial direction of the annular boss.
  12. The battery cell according to any one of claims 1 to 11, wherein the first wall includes a body portion and a protrusion protruding from a side of the body portion facing the electrode assembly, the pressure release hole penetrates the body portion and the protrusion, and the pressure release member is connected with the protrusion to form the connection portion; the connecting portion is closer to the electrode assembly than the body portion in a thickness direction of the first wall.
  13. The battery cell according to claim 12, wherein the protrusion has a first surface facing the electrode assembly, the first surface is provided with a groove, at least a portion of the pressure release member is disposed in the groove, and an outer peripheral surface of the pressure release member is connected with an inner peripheral surface of the groove to form the connection portion.
  14. The battery cell according to any one of claims 1 to 13, wherein the pressure release member is provided with a weak portion, and a projection of the blocking member does not overlap with a projection of the weak portion in the same projection plane perpendicular to the thickness direction of the first wall.
  15. The battery cell of any one of claims 1-14, wherein the barrier is an insulating material.
  16. The battery cell of any one of claims 1-15, wherein the barrier has a melting point of 85 ℃ or greater and 120 ℃ or less.
  17. The battery cell of any one of claims 1-16, wherein the barrier comprises at least one of paraffin wax, rosin, PE wax, polyolefin, stearic acid, and white oil.
  18. A battery device comprising the battery cell of any one of claims 1-17.
  19. The battery device of claim 18, wherein the first wall is located below the electrode assembly in the direction of gravity.
  20. An electrical device comprising a battery cell according to any one of claims 1 to 17, or a battery device according to claim 18 or 19; the battery cell or the battery device is used for providing electric energy.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electricity utilization device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. How to improve the reliability of the battery cell is a problem to be solved in the battery technology. Disclosure of Invention In view of the above, the present application provides a battery cell, a battery device, and an electric device, which can improve the reliability of the battery cell. In a first aspect, the application provides a battery cell comprising a housing, an electrolyte, an electrode assembly, a pressure relief member, and a barrier, the housing comprising a first wall provided with a pressure relief aperture. The electrolyte is disposed in the housing. The electrode assembly is disposed within the housing. The pressure release part covers the pressure release hole, and the pressure release part is connected with the first wall in a sealing way to form a connecting part. A barrier is connected to the first wall and the pressure relief member and covers the connection. According to the technical scheme provided by the embodiment of the application, the blocking piece which is connected with the first wall and the pressure relief part and covers the connecting part is arranged, so that the risk of leakage of electrolyte can be reduced, and the reliability of the battery cell can be improved. In one or more embodiments of the first aspect, the battery cell further includes an insulating member located between the first wall and the electrode assembly in a thickness direction of the first wall. The blocking member is connected to the insulating member. In the scheme, the insulating piece can be used as an attachment interface of the blocking piece, so that the arrangement difficulty of the blocking piece is reduced. Because the insulating part is positioned in the battery monomer, the problem of corrosion of electrolyte in the battery monomer to the connecting part is relieved, thereby improving the reliability of the connecting part and reducing the risk of leakage of the electrolyte. In one or more embodiments of the first aspect, the insulating member has a receiving groove disposed opposite the connecting portion, and at least a portion of the blocking member is disposed in the receiving groove. In the scheme, the accommodating groove can limit the setting position of the blocking piece on one hand, reduces the risk that the pressure release part cannot be actuated in time due to the blocking piece shielding the pressure release part, and on the other hand, the accommodating groove can facilitate the assembly of the blocking piece. In one or more embodiments of the first aspect, the receiving groove is an annular groove extending in a circumferential direction of the pressure relief hole. In the above scheme, because the holding tank is the annular structure that extends along the circumference of pressure release hole, be favorable to arranging and be annular barrier, but the omnidirectional separation electrolyte reduces the probability of electrolyte and connecting portion contact to reduce the electrolyte and flow to the pressure release hole and lead to the risk that electrolyte corrodes connecting portion and make connecting portion inefficacy. In one or more embodiments of the first aspect, the receiving groove includes a first groove section, a second groove section, and a third groove section connected in sequence in a thickness direction of the first wall. The width of the second slot segment is smaller than the width of the first slot segment and smaller than the width of the third slot segment. In the scheme, the containing groove is I-shaped, so that the contact area between the blocking piece arranged in the containing groove and the inner wall of the containing groove is favorably improved, the adhesive force of the blocking piece is improved, and the connection stability between the blocking piece and the insulating piece is improved. On one hand, the risk that the effect of blocking electrolyte is invalid due to dislocation of the blocking piece can be reduced, and on the other hand, the risk that the pressure release part cannot be actuated in time due to the blocking piece moving shielding the pressure release part can be reduced. In one or more embodiments of the first aspect, the insulator includes a boss having a first end face facing the connection portion, and the receiving groove is provided in the first end face. In