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CN-122003775-A - Battery monomer, battery, energy storage device and electricity utilization device

CN122003775ACN 122003775 ACN122003775 ACN 122003775ACN-122003775-A

Abstract

A battery cell (20), a battery (100), an energy storage device and an electric device. The battery unit (20) comprises a shell (1), an electrode assembly (2), an electrode terminal (3), a pressure release mechanism (4) and a blocking part (5), wherein the shell (1) is provided with a containing cavity, the shell (1) comprises a first shell wall (11), the electrode assembly (2) is at least partially arranged in the containing cavity, the electrode terminal (3) is arranged on the first shell wall (11) and is electrically connected with the electrode assembly (2), the pressure release mechanism (4) is arranged on the first shell wall (11), the blocking part (5) is arranged on the first shell wall (11), and at least part of the blocking part (5) protrudes out of the surface, facing away from the containing cavity, of the first shell wall (11) and is positioned between the pressure release mechanism (4) and the electrode terminal (3). The battery cell (20), the battery (100), the energy storage device and the electricity utilization device have high volume energy density and low short circuit probability.

Inventors

  • Nie Xianzhen
  • Meng Wanqiu
  • GAO ZIJUN
  • ZHOU WENLIN
  • CHEN WEI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240624

Claims (20)

  1. A battery cell comprising: a housing having a receiving cavity, the housing comprising a first housing wall; an electrode assembly at least partially disposed in the receiving chamber; An electrode terminal provided at the first case wall and electrically connected to the electrode assembly; the pressure release mechanism is arranged on the wall of the first shell; The separation part is arranged on the first shell wall, at least part of the separation part protrudes out of the surface of the first shell wall, which is opposite to the accommodating cavity, and is positioned between the pressure release mechanism and the electrode terminal.
  2. The battery cell according to claim 1, wherein, on a projection plane perpendicular to an arrangement direction of the pressure release mechanism and the electrode terminals, orthographic projections of the electrode terminals all fall within orthographic projection ranges of the blocking portions.
  3. The battery cell of claim 1, wherein at least a portion of the barrier is an insulating material.
  4. The battery cell of any one of claims 1 to 3, wherein at least a portion of the barrier has a material melting point above 400 ℃.
  5. The battery cell of any one of claims 1 to 4, wherein at least a portion of the barrier is a ceramic material or a plastic material.
  6. The battery cell according to any one of claims 1 to 5, wherein the blocking portion is provided entirely on a side of the first housing wall facing away from the accommodation chamber.
  7. The battery cell of claim 6, wherein the barrier is welded to the first housing wall.
  8. The battery cell according to any one of claims 1 to 5, wherein the first housing wall is provided with a mounting hole through which the blocking portion passes, one end of the blocking portion extending into the accommodation chamber, and the other end extending in a direction away from the accommodation chamber and protruding from a surface of the first housing wall facing away from the accommodation chamber.
  9. The battery cell of claim 8, wherein the barrier is riveted to the first housing wall.
  10. The battery cell of claim 8, wherein the first housing wall and the electrode assembly have an insulator therebetween, the barrier being heat fused to the insulator.
  11. The battery cell according to any one of claims 1 to 10, wherein the first case wall is provided with a liquid filling hole, and the blocking portion is provided between the liquid filling hole and the electrode terminal.
  12. The battery cell of claim 11, wherein the fill port is disposed between the barrier and the pressure relief mechanism.
  13. The battery cell of claim 12, wherein the closest distance of the pressure relief mechanism from the fluid injection hole along the length of the first housing wall is not less than 20mm.
  14. The battery cell according to claim 12 or 13, wherein a closest distance between the liquid injection hole and the electrode terminal closest to the liquid injection hole is not less than 20mm in a length direction of the first case wall.
  15. The battery cell according to any one of claims 11 to 14, wherein the size of the liquid injection hole is in a range of 6mm to 20mm along the length direction of the first housing wall.
  16. The battery cell according to any one of claims 1 to 15, wherein a closest distance between the electrode terminal closest to the barrier and the barrier is not less than 5mm.
  17. The battery cell according to claim 16, wherein a closest distance between the electrode terminal closest to the blocking portion and the blocking portion is in a range of 10mm to 20mm.
  18. The battery cell according to any one of claims 1 to 17, wherein a distance between the electrode terminal and an edge of the first case wall is not less than 5mm in a length direction of the first case wall.
  19. The battery cell of any one of claims 1 to 18, wherein a closest distance between the pressure relief mechanism and an edge of the first housing wall along a length of the first housing wall is not less than 10mm.
  20. The battery cell according to any one of claims 1 to 19, wherein a dimension of the blocking portion protruding from a surface of the first housing wall facing away from the accommodation chamber in a wall thickness direction of the first housing wall is in a range of 4.7mm to 30 mm.

Description

Battery monomer, battery, energy storage device and electricity utilization device Technical Field The disclosure relates to the technical field of batteries, in particular to a battery monomer, a battery, an energy storage device and an electric device. Background New energy batteries are increasingly used in life and industry, for example, new energy automobiles having a battery mounted therein have been widely used, and in addition, batteries are increasingly used in the field of energy storage and the like. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the energy storage field, the battery may be mounted in an energy storage case or directly on the user side. When the battery monomer is subjected to thermal runaway pressure release, the sprayed objects such as gas or liquid sprayed from the pressure release valve are easy to diffuse to the pole, and the pole and the shell are electrically conducted through the sprayed objects, so that short circuit is caused, and the performance and the service life of the battery are influenced. In addition, the industry is continually placing higher demands on the volumetric energy density of the battery. Disclosure of Invention In view of the foregoing, it is desirable to provide a battery cell, a battery, an energy storage device, and an electrical device having a high volumetric energy density and a low probability of short circuit. In order to achieve the above purpose, the present disclosure adopts the following technical solutions. The first aspect of the disclosure provides a battery cell, which comprises a housing, an electrode assembly, an electrode terminal, a pressure release mechanism and a blocking part, wherein the housing is provided with a containing cavity, the housing comprises a first housing wall, the electrode assembly is at least partially arranged in the containing cavity, the electrode terminal is arranged on the first housing wall and is electrically connected with the electrode assembly, the pressure release mechanism is arranged on the first housing wall, the blocking part is arranged on the first housing wall, and at least part of the blocking part protrudes out of the surface of the first housing wall, which is opposite to the containing cavity, and is positioned between the pressure release mechanism and the electrode terminal. The pressure release mechanism and the electrode terminal are arranged on the wall of the first shell, so that occupation of space in the accommodating cavity is reduced, and the volume energy density of the battery cell is improved. And be equipped with separation portion between relief mechanism and electrode terminal, separation portion can stop spouting the leakage thing that discharges from relief mechanism, reduces spouting the leakage thing and diffuses to the probability that contacts electrode terminal to reduce the risk of taking place the short circuit, and then improve the performance of battery and prolong the life-span of battery. In some embodiments, on a projection plane perpendicular to the arrangement direction of the pressure relief mechanism and the electrode terminals, the orthographic projection of the electrode terminals all falls within the orthographic projection range of the blocking portion. Therefore, the spraying and leaking object can be better prevented from diffusing towards the electrode terminal, the probability that the spraying and leaking object diffuses to be contacted with the electrode terminal can be reduced to a greater extent, the risk of short circuit is further reduced, the performance of the battery is further improved, and the service life of the battery is prolonged. In some embodiments, at least a portion of the barrier is an insulating material. The insulating material enables the blocking portion to have a better electrical isolation effect, so that the risk of short circuit is reduced, the performance of the battery is improved, and the service life of the battery is prolonged. In some embodiments, at least a portion of the barrier has a material melting point above 400 ℃. Therefore, the blocking effect of the blocking part 5 on the sprayed leakage object can be influenced by the fact that the blocking part 5 is melted due to the fact that the temperature of the sprayed leakage object is too high, the blocking effect can be better exerted by the blocking part, the risk of short circuit is further reduced, the performance of the battery is improved, and the service life of the battery is prolonged. In some embodiments, at least a portion of the barrier is a ceramic material or a plastic material. The ceramic material or the plastic material is a material with good insulating property and high melting point, so that the probability of melting of the blocking part can be reduced, and the insulating property can better play a role in electric insulation, so that the risk of short circuit is reduced, the perform