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CN-224217655-U - Battery monomer and battery package

CN224217655UCN 224217655 UCN224217655 UCN 224217655UCN-224217655-U

Abstract

The utility model relates to the technical field of new energy batteries and discloses a battery unit and a battery pack, wherein the battery unit is provided with a first direction and a second direction which are intersected, the battery unit comprises a shell, the shell comprises a side plate and a bottom plate, the side plate and the bottom plate enclose a containing cavity, the bottom plate is provided with a pressure relief hole, the pressure relief hole penetrates through the bottom plate along the first direction, the bottom plate is also provided with a weak part, the weak part and the pressure relief hole are arranged at intervals along the second direction, an explosion-proof valve is fixedly connected with the bottom plate, the explosion-proof valve seals the pressure relief hole, the bottom plate is also provided with a first flow passage, a second flow passage and a third flow passage, the first flow passage is communicated with the containing cavity and the weak part, the second flow passage is communicated with the containing cavity and the pressure relief hole, and the third flow passage is communicated with the weak part and the pressure relief hole. When the gas in the accommodating cavity is accumulated in a short time and cannot be discharged through the explosion-proof valve, the weak part can be broken through by high-temperature and high-pressure gas, and at the moment, the high-temperature and high-pressure gas can be rapidly discharged through the explosion-proof valve and the weak part at the same time, so that explosion of the battery cell is avoided, and the safety of the battery cell is improved.

Inventors

  • HU MINGJIANG
  • QIN JISHENG
  • YANG WEI
  • Hou Zhanrui

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 having intersecting first and second directions, the battery cell comprising: The shell comprises a side plate and a bottom plate, wherein the side plate and the bottom plate enclose a containing cavity, the bottom plate is provided with a pressure relief hole, the pressure relief hole penetrates through the bottom plate along the first direction, one side of the bottom plate, facing the containing cavity, is also provided with a weak part, and the weak part and the pressure relief hole are arranged at intervals along the second direction; The explosion-proof valve is fixedly connected with the bottom plate and seals the pressure relief hole; The bottom plate is towards one side of holding the chamber still is equipped with first runner, second runner and third runner, first runner intercommunication hold the chamber with weak portion, the second runner intercommunication hold the chamber with the pressure release hole, the third runner intercommunication weak portion with the pressure release hole.
  2. 2. The battery cell of claim 1, wherein the bottom plate includes a first plate body and a second plate body that are connected to each other along the second direction, the first plate body having a dimension of L 1 mm and the second plate body having a dimension of L 2 mm,L 1 ＞L 2 along the first direction, such that the bottom plate forms a pressure relief groove at the second plate body, the pressure relief groove forming the frangible portion.
  3. 3. The battery cell according to claim 1, wherein the bottom plate is provided with a groove forming the weak portion, and a profile shape in a cross section of the groove perpendicular to the first direction is at least one of polygonal, annular, and racetrack shape.
  4. 4. A battery cell according to any one of claims 1 to 3, wherein the base plate is further provided with a score, the score being provided on a side of the base plate facing away from the frangible portion in the first direction, the frangible portion being provided opposite the score in the first direction.
  5. 5. The battery cell of claim 4, wherein the score comprises one of a semi-circular shape, an i-shape, or a wave shape.
  6. 6. The battery cell of claim 4, further comprising a protective film attached to the base plate, wherein an orthographic projection of the protective film on the base plate covers the score along the first direction.
  7. 7. The battery cell of claim 6, wherein the protective film is further provided with an air vent that extends through the protective film in the first direction, the air vent partially overlapping the score in the first direction.
  8. 8. A battery cell according to any one of claims 1-3, further comprising a bottom plate, the bottom plate being disposed in the receiving cavity, the bottom plate having a first gap with the side plate in the second direction, the bottom plate having a second gap with the side plate in the third direction, the first flow channel being in communication with the first gap and the second gap, respectively, the second flow channel being in communication with the second gap, the first direction and the second direction intersecting the third direction.
  9. 9. The battery cell of claim 8, wherein the third flow channel extends in the second direction, the second flow channel extends in the third direction, the first flow channel is a plurality of, a portion of the first flow channel extends in the second direction, and a portion of the first flow channel extends in the third direction.
  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 When the lithium ion battery is out of control, the high-temperature and high-pressure gas generated in the lithium ion battery needs to be discharged in time, so that an explosion-proof valve is usually arranged on the lithium ion battery, and the aim of rapid pressure relief is fulfilled. The stability of the exhaust gas when the lithium ion battery is in thermal runaway is a key feature of the safety of the battery cell. The lithium ion battery with high capacity has the characteristic of high gas production during thermal runaway exhaust, a large amount of gas can be accumulated near an explosion-proof valve of the lithium ion battery, the problem that the gas cannot be exhausted in time exists, and if the high-temperature high-pressure gas cannot be exhausted in time, the lithium ion battery has the risk of explosion, so that the safety of the battery is seriously influenced. Disclosure of utility model The utility model aims to provide a battery monomer to solve the problem that the safety is affected by incapability of timely exhausting of a lithium ion battery in the prior art, and also provides a battery pack using the battery monomer. In order to achieve the above object, the present utility model provides a battery cell having intersecting first and second directions, the battery cell comprising: The shell comprises a side plate and a bottom plate, wherein the side plate and the bottom plate enclose a containing cavity, the bottom plate is provided with a pressure relief hole, the pressure relief hole penetrates through the bottom plate along the first direction, one side of the bottom plate, facing the containing cavity, is also provided with a weak part, and the weak part and the pressure relief hole are arranged at intervals along the second direction; The explosion-proof valve is fixedly connected with the bottom plate and seals the pressure relief hole; The bottom plate is towards one side of holding the chamber still is equipped with first runner, second runner and third runner, first runner intercommunication hold the chamber with weak portion, the second runner intercommunication hold the chamber with the pressure release hole, the third runner intercommunication weak portion with the pressure release hole. In some embodiments, the bottom plate includes a first plate body and a second plate body that are connected to each other along a second direction, the first plate body has a dimension L 1 mm and the second plate body has a dimension L 2 mm,L1＞L2 along the first direction, such that the bottom plate forms a pressure relief groove at the second plate body, the pressure relief groove forming the frangible portion. In some embodiments, the base plate is provided with a groove forming the weak portion, and a profile shape of the groove in a section perpendicular to the first direction is at least one of polygonal, annular, and racetrack shape. In some embodiments, the base plate is further provided with a score, the score being disposed on a side of the base plate facing away from the weakened portion along the first direction, the weakened portion being disposed opposite the score along the first direction. In some embodiments, the score comprises one of a semicircle, an i-shape, or a wave. In some embodiments, the battery cell further includes a protective film attached to the base plate, and an orthographic projection of the protective film on the base plate covers the score along the first direction. In some embodiments, the protective film is further provided with an air vent penetrating the protective film along the first direction, the air vent partially overlapping the score along the first direction. In some embodiments, the battery cell further includes a bottom plate, the bottom plate is disposed in the accommodating cavity, the bottom plate and the side plate have a first gap along the second direction, the bottom plate and the side plate have a second gap along the third direction, the first flow channel is respectively communicated with the first gap and the second gap, the second flow channel is communicated with the second gap, and the first direction, the second direction and the third direction are intersected two by two. In some embodiments, the third flow channel extends in the second direction, the second flow channel extends in the third direction, the first flow channel is plural, a portion of the first flow channel extends in the second direction, and a portion of the first flow channel extends in the third direction. The utility model also provides a battery pack, which comprises the battery monomer according to any one of the technical schemes. Compared with the prior art, the battery monomer and the battery pack have the advantages that the weak part which is arranged on th