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CN-122029663-A - Battery monomer, related device, energy storage system and charging network

CN122029663ACN 122029663 ACN122029663 ACN 122029663ACN-122029663-A

Abstract

The application is applicable to the technical field of batteries, and provides a battery cell (1), a related device, an energy storage system (1000) and a charging network (2000), wherein the related device comprises a battery device (10), an energy storage device (100) and an electricity utilization device, and the battery cell (1) comprises a shell (12), an electrode assembly (11) and a heat conducting piece (13). The electrode assembly (11) comprises a main body part (111) and a tab (112) connected to the main body part (111), wherein the main body part (111) and the tab (112) are arranged in the shell (12). The heat conductive member (13) is provided in the housing (12) and at least partially surrounds the outer periphery of the main body (111). The heat conduction member (13) has a heat conductivity greater than that of the housing (12). By providing the heat conductive member (13), the rate at which heat inside the main body portion (111) is diffused to the housing (12) to be released further can be increased, and thus the temperature difference between the inside of the main body portion (111) and the housing (12) can be effectively reduced.

Inventors

  • LI QI
  • YU HONGGANG
  • FEI FAN
  • FU CHENGHUA
  • YE YONGHUANG
  • LIAO BAIXIANG
  • XIE YONGFENG
  • Tian Yaxi
  • DU XINXIN
  • HUANG XIAOTENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20240930

Claims (20)

  1. A battery cell (1), comprising: a housing (12); An electrode assembly (11) comprising a main body part (111) and a tab (112) connected to the main body part (111), wherein the main body part (111) and the tab (112) are both arranged in the housing (12); And a heat conduction member (13) provided in the housing (12) and at least partially surrounding the outer periphery of the main body (111), wherein the heat conduction member (13) has a heat conductivity greater than that of the housing (12).
  2. The battery cell (1) according to claim 1, wherein the electrode assembly (11) is a wound structure having a winding axis direction (Z1), the main body portion (111) is provided with the tab (112) along at least one end of the winding axis direction (Z1), and at least part of the heat conductive member (13) is disposed around an outer circumference of the main body portion (111) with respect to the winding axis direction (Z1).
  3. The battery cell (1) according to claim 1 or2, wherein the number of the heat conductive members (13) and the electrode assemblies (11) is plural, and at least part of each of the heat conductive members (13) is disposed around the outer circumference of the main body portion (111) of each of the electrode assemblies (11).
  4. The battery cell (1) according to claim 1 or 2, wherein the number of the electrode assemblies (11) is plural, and at least part of the heat conductive member (13) is disposed around the outer circumference of the main body portion (111) of the plurality of electrode assemblies (11).
  5. The battery cell (1) according to claim 4, wherein the heat conductive member (13) comprises: A first heat conduction part (131) provided around the outer periphery of the main body part (111) of the plurality of electrode assemblies (11); And a second heat conduction part (132) which is provided between the main body parts (111) of the two adjacent electrode assemblies (11), and which is connected to the first heat conduction part (131).
  6. The battery cell (1) according to any one of claims 1-5, wherein the main body portion (111) is provided with the tab (112) along at least one end of a first direction (Z), and at least part of the heat conductive member (13) is disposed around an outer periphery of the main body portion (111) with respect to the first direction (Z); The dimension of the heat conducting piece (13) projected on the first direction (Z) on the main body part (111) is a first dimension (H1), the dimension of the main body part (111) in the first direction (Z) is a second dimension (H2), and the first dimension (H1) is more than or equal to 0.3 x the second dimension (H2).
  7. The battery cell (1) according to claim 6, wherein the first dimension (H1) is 0.8 x or more and the second dimension (H2) is equal to or greater than.
  8. The battery cell (1) according to claim 6 or 7, wherein the thermally conductive member (13) is flush or extends beyond at least one end of the main body portion (111) in the first direction (Z).
  9. The battery cell (1) according to any one of claims 1-8, wherein the battery cell (1) further comprises a first insulating member (14), at least part of the first insulating member (14) being arranged around the outer periphery of the main body portion (111), and the heat conducting member (13) having a heat conductivity greater than that of the first insulating member (14), the first insulating member (14) being arranged between the heat conducting member (13) and the main body portion (111) or the heat conducting member (13) being arranged between the main body portion (111) and the first insulating member (14).
  10. The battery cell (1) according to claim 9, wherein the number of the electrode assemblies (11) is plural, and at least part of the first insulating member (14) is disposed around the outer circumference of the main body portion (111) of the plurality of electrode assemblies (11); The heat conductive member (13) is disposed at least partially around the outer circumference of the main body portion (111) of the plurality of electrode assemblies (11), and the first insulating member (14) is disposed between the heat conductive member (13) and the main body portion (111), or the heat conductive member (13) is disposed between the main body portion (111) and the first insulating member (14).
  11. The battery cell (1) according to any one of claims 1-10, wherein the main body portion (111) is provided with the tab (112) along at least one end of a first direction (Z), and at least part of the heat conductive member (13) is disposed around an outer periphery of the main body portion (111) with respect to the first direction (Z); The battery unit (1) further comprises a second insulating piece (15), and the second insulating piece (15) is arranged at one end of the main body part (111) with the lug (112) in the first direction (Z); A portion of the heat conductive member (13) is provided between the outer periphery of the second insulating member (15) with respect to the first direction (Z) and the housing (12), or a portion of the heat conductive member (13) is provided between the second insulating member (15) and the main body portion (111) in the first direction (Z).
  12. The battery cell (1) according to claim 11, wherein the battery cell (1) further comprises a first insulating member (14), at least part of the first insulating member (14) is disposed around an outer periphery of the main body portion (111) with respect to the first direction (Z), and the heat conductive member (13) has a heat conductivity greater than that of the first insulating member (14); The first insulating member (14) is disposed between the heat conducting member (13) and the main body portion (111), and a portion of the heat conducting member (13) is disposed between the outer periphery of the second insulating member (15) with respect to the first direction (Z) and the housing (12), or the heat conducting member (13) is disposed between the main body portion (111) and the first insulating member (14), and in the first direction (Z), a portion of the heat conducting member (13) is disposed between the second insulating member (15) and the main body portion (111).
  13. The battery cell (1) according to any one of claims 1 to 12, wherein the tab (112) is provided at one end of the main body portion (111) in a first direction (Z), a portion of the heat conductive member (13) is provided around an outer periphery of the main body portion (111) with respect to the first direction (Z), and a portion of the heat conductive member (13) is provided between an end of the main body portion (111) away from the tab (112) in the first direction (Z) and the housing (12).
  14. The battery cell (1) according to claim 13, wherein the battery cell (1) further comprises a third insulating member (16), the third insulating member (16) being provided between an end of the main body portion (111) remote from the tab (112) in the first direction (Z) and the housing (12); In the first direction (Z), the third insulating member (16) is disposed between the main body portion (111) and the heat conducting member (13), or in the first direction (Z), at least part of the heat conducting member (13) is disposed between the third insulating member (16) and the main body portion (111).
  15. The battery cell (1) according to claim 14, wherein the battery cell (1) further comprises a first insulating member (14), at least part of the first insulating member (14) is disposed around an outer periphery of the main body portion (111) with respect to the first direction (Z), and the heat conductive member (13) has a heat conductivity greater than that of the first insulating member (14); The first insulating member (14) is disposed between the heat conducting member (13) and the main body portion (111) and in the first direction (Z), the third insulating member (16) is disposed between the main body portion (111) and the heat conducting member (13), or the heat conducting member (13) is disposed between the main body portion (111) and the first insulating member (14) and in the first direction (Z), at least a portion of the heat conducting member (13) is disposed between the main body portion (111) and the third insulating member (16).
  16. The battery cell (1) according to any one of claims 1-15, wherein the thermally conductive member (13) comprises at least one of a graphene film, a copper foil, an aluminum foil, a graphite heat-dissipating paste, a nanocarbon copper foil, a nanocarbon aluminum foil.
  17. Battery cell (1) according to any of claims 1-16, wherein at least part of the thermally conductive member (13) is of an insulating structure to provide insulation between the main body portion (111) and the housing (12).
  18. The battery cell (1) according to any one of claims 1 to 8, wherein at least one of the side of the heat conductive member (13) near the main body portion (111) and the side of the heat conductive member (13) near the housing (12) is an insulating structure, and the heat conductive member (13) is in contact with the main body portion (111) and the housing (13).
  19. The battery cell (1) according to any one of claims 1-18, wherein the thermally conductive member (13) is of integral connection structure.
  20. The battery cell (1) according to any one of claims 1 to 19, wherein the thermal conductivity of the thermally conductive member (13) is equal to or greater than 100W/m-K.

Description

Battery monomer, related device, energy storage system and charging network Technical Field The application relates to the technical field of batteries, in particular to a battery monomer, a related device, an energy storage system and a charging network. Background In the related art, a battery cell may include a case and an electrode assembly disposed within the case. In some cases, the battery cells generate larger heat in the working process, so that the heat accumulation in the electrode assembly is serious, and the temperature difference between the interior of the electrode assembly and the outer shell is easy to be large, thereby influencing the service performance and the service life of the battery cells. Disclosure of Invention In view of the above, it is an object of embodiments of the present application to provide a battery cell, a related device, an energy storage system, and a charging network capable of reducing a temperature difference between the inside of an electrode assembly and a case of the battery cell. The technical scheme adopted by the embodiment of the application is as follows: in a first aspect, an embodiment of the present application provides a battery cell, including: A housing; the electrode assembly comprises a main body part and a tab connected to the main body part, and the main body part and the tab are both arranged in the shell; the heat conduction member is arranged in the shell and at least partially surrounds the periphery of the main body part, and the heat conduction member has a heat conductivity greater than that of the shell. According to the battery cell provided by the embodiment of the application, the heat conduction piece is arranged in the shell of the battery cell, the heat conductivity of the heat conduction piece is larger than that of the shell, and at least part of the heat conduction piece is arranged around the periphery of the main body part of the electrode assembly, so that heat on the main body part can be efficiently conducted to the heat conduction piece and is conducted to the shell through the heat conduction piece. Like this, can accelerate the inside heat diffusion of main part to the shell in order then the speed of release to can effectively reduce the inside and the shell of main part between the difference in temperature, with promoting battery single heat dispersion, help improving battery single performance and life-span. In some embodiments, the electrode assembly is a wound structure having a winding axis, the body portion is provided with a tab at least one end in the winding axis, and at least a portion of the heat conductive member is disposed around an outer circumference of the body portion with respect to the winding axis. By surrounding at least part of the heat conducting member on the outer periphery of the main body part relative to the winding axial direction, a larger relative area is formed between the heat conducting member and the main body part, and the heat conducting member can better conduct out the heat in the main body part. And the heat conduction piece and the shell are provided with a larger relative area, so that the heat conduction piece can better conduct heat to the shell. So set up, can effectively reduce the inside difference in temperature between the shell of main part, improve battery monomer performance and life-span. In some embodiments, the number of heat conductive members and electrode assemblies is plural, and at least a portion of each heat conductive member is disposed around the outer periphery of the main body portion of each electrode assembly. By arranging the heat conducting members at least partially around the outer periphery of the main body portion of each electrode assembly, each heat conducting member can conduct out the heat inside the main body portion of each electrode assembly in a targeted manner. And in this way, two layers of heat conducting pieces are arranged between the main body parts of two adjacent electrode assemblies, so that heat between the main body parts of the two adjacent electrode assemblies can be conveniently conducted out. By the arrangement, the heat conduction efficiency of the heat conduction piece in the combined structure formed by the electrode assemblies can be improved, so that the temperature difference between the inside of the combined structure formed by the electrode assemblies and the shell can be effectively reduced, and the service performance and the service life of the battery unit are improved. In some embodiments, the number of electrode assemblies is plural, and at least part of the heat conductive member is disposed around the outer circumference of the main body portion of the plurality of electrode assemblies. By the arrangement, the heat conduction piece can conduct out the heat inside the main body part of the electrode assemblies, so that the temperature difference between the inside of the combined structure formed by the ele