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CN-224217662-U - Battery monomer and battery package

CN224217662UCN 224217662 UCN224217662 UCN 224217662UCN-224217662-U

Abstract

The utility model relates to the technical field of new energy batteries and discloses a battery cell and a battery pack, wherein the battery cell is provided with a first direction, a second direction and a third direction which are perpendicular to each other, the battery cell comprises a shell, a containing cavity, a cover plate fixedly connected with the shell and sealing the containing cavity, an electrode assembly arranged in the containing cavity, an insulating film arranged in the containing cavity and wrapping the electrode assembly, the insulating film comprises a bottom film arranged opposite to the cover plate along the first direction and a side film connected with the bottom film, a plurality of convex parts are arranged on one side of the side film facing the shell along the second direction or the third direction at intervals, the side film forms concave parts between the convex parts, and exhaust passages extending along the first direction are formed by surrounding the convex parts, the concave parts and the shell. When the battery monomer is out of control, the exhaust passage can discharge the gas gathered at the cover plate to the explosion-proof valve at the bottom of the shell along the first direction for quick pressure relief, so that the risk of bursting of the cover plate is reduced, and the safety of the battery monomer is improved.

Inventors

  • LI MINJIAN
  • YANG WEI
  • HU MINGJIANG

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (10)

  1. 1. A battery cell, wherein the battery cell has a first direction, a second direction, and a third direction that are perpendicular to each other in pairs, the battery cell comprising: A housing provided with a receiving chamber; The cover plate is fixedly connected with the shell and seals the accommodating cavity; An electrode assembly provided in the receiving chamber; the insulating film is arranged in the accommodating cavity, the insulating film wraps the electrode assembly, the insulating film comprises a bottom film and a side film, the bottom film is arranged opposite to the cover plate along the first direction, the side film is connected with the bottom film, a plurality of protruding portions are arranged on the side of the side film, facing the shell along the second direction or the third direction, at intervals, the side film forms concave portions between the protruding portions, and the protruding portions, the concave portions and the shell enclose each other to form an exhaust channel extending along the first direction.
  2. 2. The battery cell of claim 1, wherein the recess is provided with a first frangible portion.
  3. 3. The battery cell of claim 2, wherein the recess is provided with a first score extending in the first direction or the second direction, the first score forming the first frangible portion.
  4. 4. A battery cell according to any one of claims 1 to 3, wherein the protrusion comprises an elongate boss extending in the first direction, the side film forming the recess between adjacent two of the elongate bosses.
  5. 5. The battery cell as defined in claim 4, wherein the elongated boss is provided with a groove recessed toward the case at a side thereof adjacent to the electrode assembly, the elongated boss including a first sidewall facing the case in the second direction or the third direction and a second sidewall connected between the first sidewall and the recess, the second sidewall further being provided with a second weak portion.
  6. 6. The battery cell of claim 5, wherein the second sidewall is provided with a second score extending in the first direction or the second direction, the second score forming the second frangible portion.
  7. 7. The battery cell of claim 5, wherein the second sidewall is further provided with an air hole that extends through the second sidewall in the second direction or the third direction.
  8. 8. A battery cell according to any one of claims 1 to 3, wherein the protrusion comprises a plurality of circular bosses, a plurality of the circular boss arrays being arranged, the side film forming the recess between adjacent two of the circular bosses.
  9. 9. A battery cell according to any one of claims 1 to 3, wherein the cover plate comprises a top cover sheet and a lower insulating member connected to the top cover sheet, the top cover sheet being fixedly connected to the housing, the lower insulating member being provided on a side of the top cover sheet facing the electrode assembly in the first direction, the lower insulating member being provided with a first port located on a side of the side film facing the electrode assembly, a second port located on a side of the side film facing the housing, and an air passage communicating the first port with the second port.
  10. 10. A battery pack comprising the battery cell of any one of claims 1-9.

Description

Battery monomer and battery package Technical Field The utility model relates to the technical field of new energy batteries, in particular to a battery monomer and a battery pack. Background If the lithium ion battery is subjected to impact damage or internal short circuit during use, a thermal runaway phenomenon can occur, and in order to improve the safety of the lithium ion battery, an explosion-proof valve can be arranged on the lithium ion battery, and when the internal pressure is increased due to the thermal runaway of the lithium ion battery, the explosion-proof valve can be broken to rapidly reduce the internal pressure of the lithium ion battery. Conventional lithium ion batteries include a housing, a top cover, an insulating film, an electrode assembly disposed within the housing, the top cover closing the housing, and an explosion-proof valve surrounding the electrode assembly to isolate the electrode assembly from the housing, the explosion-proof valve being disposed on the top cover or the housing. The top cover of the lithium ion battery is provided with a pole, and when the scheme of arranging the explosion-proof valve on the top cover encounters abuse or extreme conditions of a battery core, double failures of electric insulation and thermal runaway are easy to occur. With the gradual improvement of the safety performance requirements of the power battery, the design of thermoelectric separation is becoming more and more common in order to avoid reducing the risk of double failures of the design scheme. The common thermoelectric separation design is to cancel an explosion-proof valve on the top cover, and the explosion-proof valve is arranged at the bottom of the shell, so that the functions of electric connection and thermal runaway explosion without interference under the condition of misuse of a battery core are realized. But set up the explosion-proof valve on the aluminum hull after, when the electric core takes place thermal runaway, gaseous upward gathers in top cap position under high temperature, and the internal pressure of top cap position rises and can cause the top cap to burst, and high temperature gas erupts from the weak department of top cap, probably can ignite other electric cores, enlarges thermal runaway scope, influences lithium ion battery's security. Disclosure of utility model The utility model aims to provide a battery cell to solve the problem that a top cover is broken when a lithium ion battery is out of control in the prior art, and also provides a battery pack using the battery cell. In order to achieve the above object, the present utility model provides a battery cell having a first direction, a second direction, and a third direction perpendicular to each other in pairs, the battery cell comprising: A housing provided with a receiving chamber; The cover plate is fixedly connected with the shell and seals the accommodating cavity; An electrode assembly provided in the receiving chamber; the insulating film is arranged in the accommodating cavity, the insulating film wraps the electrode assembly, the insulating film comprises a bottom film and a side film, the bottom film is arranged opposite to the cover plate along the first direction, the side film is connected with the bottom film, a plurality of protruding portions are arranged on the side of the side film, facing the shell along the second direction or the third direction, at intervals, the side film forms concave portions between the protruding portions, and the protruding portions, the concave portions and the shell enclose each other to form an exhaust channel extending along the first direction. In some embodiments, the recess is provided with a first frangible portion. In some embodiments, the recess is provided with a first score extending in the first direction or the second direction, the first score forming the first frangible portion. In some embodiments, the protrusions comprise elongated bosses extending in the first direction, and the side film forms the recesses between adjacent two of the elongated bosses. In some embodiments, a groove recessed toward the case is provided at a side of the elongated boss adjacent to the electrode assembly, the elongated boss including a first sidewall facing the case in the second direction or the third direction and a second sidewall connected between the first sidewall and the recess, the second sidewall further being provided with a second weak portion. In some embodiments, the second sidewall is provided with a second score extending in the first direction or the second direction, the second score forming the second frangible portion. In some embodiments, the second sidewall is further provided with air holes extending through the second sidewall in the second direction or the third direction. In some embodiments, the protrusion comprises a plurality of circular bosses, a plurality of the circular boss arrays are arranged, and the side film forms the