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CN-224232685-U - Battery cell, battery device and electricity utilization device

CN224232685UCN 224232685 UCN224232685 UCN 224232685UCN-224232685-U

Abstract

The application provides a battery cell, a battery device and an electric device, wherein the battery cell is an alkali metal battery, the battery cell comprises a shell, an electrode assembly, an electrode terminal and a first supporting piece, a containing cavity is formed in the shell, the shell comprises a first wall, a second wall and a third wall, the first wall and the second wall are oppositely arranged, the third wall is arranged between the first wall and the second wall, one end of the third wall is connected with the first wall, the other end of the third wall is connected with the second wall, the electrode assembly is contained in the containing cavity and is positioned between the first wall and the second wall, the electrode assembly comprises a pole piece, the electrode terminal is arranged on the third wall, the electrode terminal is electrically connected with the electrode assembly, the first supporting piece is arranged between the first wall and the electrode assembly, a first cavity is formed between the first supporting piece and the first wall and/or between the first supporting piece and the electrode assembly, and the space where the first cavity and the pole piece are located is communicated.

Inventors

  • HU CHUNYONG
  • LI CAN
  • XING CHENGYOU
  • YANG DAOWEI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250303

Claims (20)

  1. 1. A battery cell that is an alkali metal battery, the battery cell comprising: A housing having a receiving cavity therein, the housing including a first wall, a second wall, and a third wall, the first wall and the second wall being disposed opposite to each other, the third wall being disposed between the first wall and the second wall, one end of the third wall being connected to the first wall and the other end being connected to the second wall; an electrode assembly received in the receiving cavity and positioned between the first wall and the second wall, the electrode assembly including a pole piece; an electrode terminal disposed at the third wall, the electrode terminal being electrically connected to the electrode assembly; The first support piece is arranged between the first wall and the electrode assembly, a first cavity is formed between the first support piece and the first wall and/or between the first support piece and the electrode assembly, and the first cavity is communicated with a space where the pole piece is located.
  2. 2. The battery cell according to claim 1, wherein the first support member includes a plate body for supporting the electrode assembly and a protrusion portion provided to the plate body and protruding toward the first wall, the first cavity being formed between the plate body and the first wall by the protrusion portion in a first direction, the first direction being a direction perpendicular to the first wall.
  3. 3. The battery cell of claim 2, wherein the protrusion is a hollow structure.
  4. 4. The battery cell of claim 3, wherein the electrode assembly comprises at least two of the pole pieces, the pole pieces being wound about a winding axis extending in the first direction therebetween, or the pole pieces being stacked therebetween; The hollow part of the protruding part penetrates through the protruding part along the first direction, the plate body is provided with a first communication hole corresponding to the protruding part, and the space where the pole piece is located is communicated with the first cavity through the first communication hole and the hollow part.
  5. 5. The battery cell of claim 2, wherein the electrode assembly comprises at least two of the pole pieces, the pole pieces being wound about a winding axis extending in the first direction therebetween, or the pole pieces being stacked therebetween; The plate body is also provided with a second communication hole, and the space where the pole piece is located is communicated with the first cavity through the second communication hole.
  6. 6. The battery cell of claim 2, wherein the electrode assembly comprises at least two pole pieces, the pole pieces being wound between about a winding axis extending in a second direction or stacked between the pole pieces, the second direction intersecting the first direction; the third wall is arranged on at least one side of the shell along the second direction, the lug of the electrode assembly faces the third wall and is provided with a gap along the second direction, and the first cavity is communicated with the space where the pole piece is located through the gap.
  7. 7. The battery cell of claim 6, wherein the housing comprises a shell comprising the first wall and the second wall, the shell being provided with an opening on at least one side in a second direction, and an end cap assembly covering the opening and forming the third wall; The electrode terminals comprise a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal are arranged on the end cover assembly, and the electrode lugs and the end cover assembly are provided with gaps.
  8. 8. The battery cell as defined in claim 7, wherein the housing is provided with an opening on one side in a second direction, the first electrode terminal and the second electrode terminal being both provided on the same end cap assembly; Or openings are formed in two sides of the shell in the second direction, and the first electrode terminal and the second electrode terminal are respectively arranged on the end cover assemblies on two sides.
  9. 9. The battery cell of claim 6, wherein the housing comprises a shell comprising the first wall, the second wall, and the third wall, the shell being provided with an opening on one side in a second direction, and an end cap assembly covering the opening and disposed opposite the third wall; The electrode terminals include a first electrode terminal and a second electrode terminal, at least one of the first electrode terminal and the second electrode terminal is disposed on a third wall of the case, the first support extends at least partially between the third wall and the electrode assembly, and the tab forms the gap through between the first support and the third wall.
  10. 10. The battery cell according to any one of claims 7 to 9, wherein the end cap assembly includes a cap body, and an insulating member provided at a side of the cap body facing the receiving chamber; the insulating member and the first support are partially folded onto and overlapped with one another, and the insulating member and the first support are connected in an overlapped area.
  11. 11. The battery cell as recited in claim 10, wherein the first support is provided with a connection hole in the overlap region, and the insulating member at least partially extends into the connection hole and is fixedly connected with the first support.
  12. 12. The battery cell according to any one of claims 2 to 9, wherein the number of the protruding portions is two or more, and the two or more protruding portions are provided on the plate body at intervals.
  13. 13. The battery cell according to any one of claims 2 to 9, wherein a maximum protruding distance of the protruding portion of the first support in the first direction is 4mm or more and 50mm or less.
  14. 14. The battery cell of any one of claims 2 to 9, further comprising a second support disposed between the second wall and the electrode assembly, wherein a second cavity is provided between the second support and the second wall and/or between the second support and the electrode assembly, wherein the second cavity is in communication with a space in which the pole piece is located.
  15. 15. The battery cell as recited in claim 14, wherein the second support has a structure identical to the first support, the protrusion of the second support is disposed on the plate and protrudes toward the second wall, and the second cavity is formed between the plate of the second support and the second wall in a first direction by the protrusion; The sum of the maximum protruding distance of the protruding part of the first support piece in the first direction and the maximum protruding distance of the protruding part of the second support piece in the first direction is more than or equal to 4mm and less than or equal to 50mm.
  16. 16. The battery cell of claim 15, wherein a maximum protrusion distance of the protrusion of the first support in the first direction and a maximum protrusion distance of the protrusion of the second support in the first direction are each 2mm or more and 25mm or less.
  17. 17. The battery cell according to claim 15, wherein a cell capacity a of the battery cell is 10Ah ∈a ∈50Ah, and a maximum protruding distance of the protruding portion of at least one of the first support member and the second support member in the first direction is 2mm or more and 8mm or less; Or the battery cell capacity A of the battery cell is more than or equal to 50Ah and less than or equal to 100Ah, and the maximum protruding distance of the protruding part of at least one of the first supporting piece and the second supporting piece along the first direction is more than or equal to 5mm and less than or equal to 18mm; Or the battery cell capacity A of the battery cell is more than or equal to 100Ah and less than or equal to 250Ah, and the maximum protruding distance of the protruding part of at least one of the first supporting piece and the second supporting piece along the first direction is more than or equal to 5mm and less than or equal to 25mm.
  18. 18. The battery cell of claim 15, wherein a ratio a of a volume of at least one of the first cavity and the second cavity to a volume of the receiving cavity is greater than or equal to 2% and less than or equal to 16%; The volume of the first cavity is the difference obtained by subtracting the self volume of the protruding part from the product of the protruding distance of the protruding part of the first support part along the first direction and the area of the plate body, and the volume of the second cavity is the difference obtained by subtracting the self volume of the protruding part from the product of the protruding distance of the protruding part of the second support part along the first direction and the area of the plate body.
  19. 19. The battery cell of claim 18, wherein the battery cell has a cell capacity a of 10Ah +.a +.50ah, and a ratio a of a volume of at least one of the first cavity and the second cavity to a volume of the receiving cavity satisfies 2+≤a +≤12%; or the electric core capacity A of the battery monomer is more than or equal to 50Ah and less than or equal to 100Ah, and the ratio a of the volume of at least one of the first cavity and the second cavity to the volume of the accommodating cavity is more than or equal to 5% and less than or equal to 14%; Or the cell capacity A of the battery cell is not less than 100Ah and not more than 250Ah, and the ratio a of the volume of at least one of the first cavity and the second cavity to the volume of the accommodating cavity is not less than 5% and not more than 16%.
  20. 20. The battery cell according to any one of claims 2 to 9, wherein a maximum dimension of the plate body of the first support member in the first direction is 0.3mm or more.

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. In order to improve the energy density of the battery, the internal space of the battery adopts a limit design so as to enable the group margin of the electrode assembly to reach more than 90 percent. However, the above-described structure may result in limited internal space of the battery, which is too small for a battery cell having a large gas production amount, and may easily cause an increase in internal pressure during use, affecting the service life of the battery. Disclosure of utility model In view of the above, the present application provides a battery cell, a battery device, and an electric device, which can increase the space for accommodating gas and electrolyte inside the battery and improve the service life of the battery. In a first aspect, the application provides a battery cell, which is an alkali metal battery, the battery cell comprises a housing, an electrode assembly, an electrode terminal and a first support member, a containing cavity is formed in the housing, the housing comprises a first wall, a second wall and a third wall, the first wall and the second wall are oppositely arranged, the third wall is arranged between the first wall and the second wall, one end of the third wall is connected with the first wall, the other end of the third wall is connected with the second wall, the electrode assembly is contained in the containing cavity and is positioned between the first wall and the second wall, the electrode assembly comprises a pole piece, the electrode terminal is arranged on the third wall, the electrode terminal is electrically connected with the electrode assembly, the first support member is arranged between the first wall and the electrode assembly, a first cavity is formed between the first support member and the first wall and/or between the first support member and the electrode assembly, and a space where the first cavity and the pole piece are located is communicated. In the embodiment of the application, the first cavity is arranged between the first supporting piece and the first wall and/or between the first supporting piece and the electrode assembly, so that enough space can be reserved in the accommodating cavity to accommodate gas generated by chemical reaction of the battery monomer, the internal air pressure of the battery monomer in the using process is reduced, and the long-term performance and the service life of the battery monomer are improved. In some embodiments, the first support includes a plate body for supporting the electrode assembly and a protrusion disposed at the plate body and protruding toward the first wall, and a first cavity is formed between the plate body and the first wall by the protrusion along a first direction, the first direction being a direction perpendicular to the first wall. In some embodiments, the protruding portion is a hollow structure, so that the weight of the first supporting piece can be reduced, the weight of the battery cell can be further reduced, and the performance of the battery cell can be improved. In some embodiments, the electrode assembly includes at least two pole pieces that are wound about a winding axis extending in a first direction between the pole pieces, or stacked between the pole pieces. The hollow part of bulge runs through the bulge along first direction setting, and the plate body corresponds the bulge and is provided with first communication hole, and the space that the pole piece is located is linked together with first cavity through first communication hole and hollow part to the transfer of gas and electrolyte improves the infiltration effect to the pole piece. In some embodiments, the electrode assembly includes at least two pole pieces that are wound about a winding axis extending in a first direction between the pole pieces, or stacked between the pole pieces. The plate body is also provided with a second communication hole, and the space where the pole piece is located is communicated with the first cavity through the second communication hole so as to facilitate the transfer of gas and electrolyte and improve the infiltration effect on the pole piece. In some embodiments, the electrode assembly includes at least two pole pieces wound about a winding axis extending in the second direction between the pole pieces, or stacked between th