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CN-224217573-U - Battery monomer and battery package

CN224217573UCN 224217573 UCN224217573 UCN 224217573UCN-224217573-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 comprises a shell, an electrode assembly and a cover plate, the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the cover plate comprises a top cover plate and lower plastic, the top cover plate is provided with a liquid injection hole, the lower plastic comprises a body and an abutting platform, the abutting platform comprises a side plate and a bottom plate connected with the side plate, the body is fixedly connected with the side plate, the bottom plate abuts against the electrode assembly along a first direction, the side plate, the bottom plate and the top cover plate form a slow flow cavity in a surrounding mode, the slow flow cavity is communicated with the liquid injection hole, the liquid injection hole is opposite to the bottom plate along the first direction, and the side plate is further provided with an opening which is communicated with the slow flow cavity and the containing cavity. When electrolyte is injected, the electrolyte impacts the bottom plate along the first direction, and enters the accommodating cavity through the opening after decelerating in the slow flow cavity, so that the electrolyte is prevented from directly impacting the electrode assembly, and the bottom plate is abutted against the electrode assembly along the first direction, so that enough electrolyte buffering space can be ensured, and the phenomenon of overflowing is avoided.

Inventors

  • LI MINJIAN
  • YANG WEI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250523

Claims (11)

  1. 1. A battery cell having first, second and third directions intersecting one another in pairs, the battery cell comprising: a housing having a receiving cavity; An electrode assembly provided in the receiving chamber; The cover plate is fixedly connected with the shell and seals the accommodating cavity, the cover plate comprises a top cover plate and lower plastic fixedly connected with the top cover plate, and the top cover plate is provided with a liquid injection hole penetrating through the top cover plate along the first direction; The lower plastic comprises a body and an abutting platform which are mutually connected, the abutting platform comprises a side plate and a bottom plate connected with the side plate, the body is fixedly connected with the side plate, the bottom plate is in the first direction, the bottom plate is in abutting connection with the electrode assembly, the side plate, the bottom plate and the top cover sheet are surrounded to form a slow flow cavity, the slow flow cavity is communicated with the liquid injection hole, the liquid injection hole and the bottom plate are oppositely arranged in the first direction, the side plate is further provided with an opening, the opening penetrates through the side plate in the second direction and/or the third direction, and the opening is communicated with the slow flow cavity and the accommodating cavity.
  2. 2. The battery cell of claim 1, further comprising a turbulence member disposed within the slow flow cavity.
  3. 3. The battery cell according to claim 2, wherein the turbulence member comprises a protrusion fixedly connected to the bottom plate, the protrusion being provided at an end of the bottom plate adjacent to the opening, the protrusion extending in the second direction or the third direction.
  4. 4. A battery cell according to claim 3, wherein the connection of the protrusion and the base plate is further provided with an R-angle.
  5. 5. The battery cell according to claim 2, wherein the turbulence member comprises a bump fixedly connected to the bottom plate, the bump is disposed at an end of the bottom plate near the opening, and the bump is provided with a plurality of bumps at intervals along the second direction and/or the third direction.
  6. 6. The battery cell of claim 2, wherein the turbulence member comprises an annular convex hull fixedly connected to the bottom plate, the annular convex hull being disposed opposite the liquid injection hole in the first direction, the annular convex hull being disposed in plurality.
  7. 7. The battery cell of any one of claims 1-6, wherein the abutment further comprises a first bead and a second bead, the first bead and the second bead being disposed at intervals along the second direction or the third direction, and the bottom plate, the side plate, the first bead, and the second bead are enclosed to form the slow flow cavity.
  8. 8. The battery cell according to claim 7, wherein a distance between the first bead and the second bead is L mm along the second direction or the third direction, a groove extending around the liquid injection hole is further formed in a side of the top cover sheet facing the abutment table, and an outer diameter of the groove is D mm, so that L > D is satisfied.
  9. 9. The battery cell of claim 7, wherein the abutment further comprises a third bead, the third bead being fixedly connected between the first bead and the side plate, and between the second bead and the side plate.
  10. 10. The battery cell of any one of claims 1-6, further comprising a protective tape attached to a side of the electrode assembly facing the lower plastic, the side plate provided with the opening covering a portion of the protective tape in the front projection of the electrode assembly in the first direction.
  11. 11. A battery pack comprising the battery cell of any one of claims 1-10.

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 The lithium ion battery is generally formed by a shell, a cover plate and an electrode assembly, the electrode assembly is installed in the shell, a liquid injection hole is formed in the cover plate, electrolyte is injected into the shell through the liquid injection hole, a closed space is formed after the cover plate is connected with the shell, the electrode assembly and the like are sealed in the shell, and leakage of the electrolyte is avoided. The cover plate of the conventional lithium ion battery is provided with lower plastic to insulate and isolate the cover plate from the electrode assembly, and the lower plastic at the position of the liquid injection hole is provided with a through hole which is opposite to the liquid injection hole. However, when the lithium ion battery is injected, electrolyte does not have any barrier after entering the shell through the injection hole and the through hole, the electrolyte impacts the electrode assembly at high pressure and high speed, so that the electrode assembly is easy to bend, fall off powder and the like, the internal resistance of the battery core is overlarge, the phenomenon of short circuit can occur under extreme conditions, and potential safety hazards exist. Disclosure of utility model The utility model aims to provide a battery monomer to solve the problem that potential safety hazards exist in the lithium ion battery in the prior art when the lithium ion battery is injected, 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 a first direction, a second direction, and a third direction intersecting with each other, the battery cell comprising: a housing having a receiving cavity; An electrode assembly provided in the receiving chamber; The cover plate is fixedly connected with the shell and seals the accommodating cavity, the cover plate comprises a top cover plate and lower plastic fixedly connected with the top cover plate, and the top cover plate is provided with a liquid injection hole penetrating through the top cover plate along the first direction; The lower plastic comprises a body and an abutting platform which are mutually connected, the abutting platform comprises a side plate and a bottom plate connected with the side plate, the body is fixedly connected with the side plate, the bottom plate is in the first direction, the bottom plate is in abutting connection with the electrode assembly, the side plate, the bottom plate and the top cover sheet are surrounded to form a slow flow cavity, the slow flow cavity is communicated with the liquid injection hole, the liquid injection hole and the bottom plate are oppositely arranged in the first direction, the side plate is further provided with an opening, the opening penetrates through the side plate in the second direction and/or the third direction, and the opening is communicated with the slow flow cavity and the accommodating cavity. In some embodiments, the battery cell further comprises a turbulence member, and the turbulence member is disposed in the slow flow cavity. In some embodiments, the turbulence member includes a protrusion, the protrusion is fixedly connected with the bottom plate, the protrusion is disposed at an end of the bottom plate near the opening, and the protrusion extends along the second direction or the third direction. In some embodiments, the connection of the protrusion and the bottom plate is further provided with an R angle. In some embodiments, the turbulence member includes a bump fixedly connected to the bottom plate, the bump is disposed at an end of the bottom plate near the opening, and the bump is disposed at intervals along the second direction and/or the third direction. In some embodiments, the turbulence member includes an annular convex hull fixedly connected to the bottom plate, the annular convex hull being disposed opposite the liquid injection hole along the first direction, the annular convex hull being provided with a plurality of annular convex hulls. In some embodiments, the abutment further includes a first rib and a second rib, the first rib and the second rib are disposed at intervals along the second direction or the third direction, and the bottom plate, the side plate, the first rib and the second rib are enclosed to form the slow flow cavity. In some embodiments, along the second direction or the third direction, a distance between the first rib and the second rib is L mm, a groove extending around the liquid injection hole is further formed on a side of the top cover sheet facing the abutting table, and an outer diameter of the groove is D mm, so that L > D is satisfied. In some embodiments, the abutment further comprises a third rib, and