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CN-224204213-U - Battery cell, battery device and electricity utilization device

CN224204213UCN 224204213 UCN224204213 UCN 224204213UCN-224204213-U

Abstract

A battery cell (81) comprises a housing (10) comprising a receiving cavity (11), wherein the housing (10) comprises at least one first wall (13), the first wall (13) is provided with a through hole (12), an electrode assembly (20) positioned in the receiving cavity (11), an electrode terminal (30) at least partially arranged in the through hole (12) and electrically connected with the electrode assembly (20), the electrode terminal (30) comprises a first outer wall surface (31) positioned in the through hole (12), the inner wall surface (121) of the through hole (12) and the first outer wall surface (31) are substantially parallel to a first direction (dr 1), the first direction (dr 1) is the thickness direction of the first wall (13), and a sealing member (40) positioned between an inner wall surface (121) of the through hole (12) and the first outer wall surface (31) so as to enable the inner wall surface (121) and the first outer wall surface (31) to be in sealing fit.

Inventors

  • SU HUASHENG
  • KE HAIBO
  • YANG DAOWEI
  • ZHENG YULIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20250116

Claims (19)

  1. 1. A battery cell (81), characterized by comprising: -a housing (10) comprising a receiving cavity (11), said housing (10) comprising at least one first wall (13), said first wall (13) being provided with a through hole (12); An electrode assembly (20) located within the receiving chamber (11); An electrode terminal (30) disposed at least partially in the through hole (12) and electrically connected to the electrode assembly (20), the electrode terminal (30) including a first outer wall surface (31) located in the through hole (12), and both the inner wall surface (121) and the first outer wall surface (31) of the through hole (12) being substantially parallel to a first direction (dr 1) which is a thickness direction of the first wall (13), and And a seal member (40) which is positioned between the inner wall surface (121) and the first outer wall surface (31) so as to seal and mate the inner wall surface (121) and the first outer wall surface (31).
  2. 2. The battery cell (81) according to claim 1, wherein an angle between the inner wall surface (121) and the first direction (dr 1) is 5 ° or less, and/or an angle between the first outer wall surface (31) and the first direction (dr 1) is 5 ° or less.
  3. 3. The battery cell (81) of claim 1 wherein the first outer wall surface (31) is provided with a first groove (311), the seal (40) having a portion located within the first groove (311).
  4. 4. A battery cell (81) according to claim 3 wherein the inner wall surface (121) is provided with a second groove (1211), the seal (40) further having a portion located within the second groove (1211).
  5. 5. The battery cell (81) of claim 4 wherein the first groove (311) is circumferentially continuous on the first outer wall surface (31) and the second groove (1211) is circumferentially continuous on the inner wall surface (121), the seal (40) comprising a sealing ring (41), the sealing ring (41) being respectively embedded in the first groove (311) and the second groove (1211).
  6. 6. The battery cell (81) according to claim 1, wherein the electrode terminal (30) further has a second outer wall surface (32), the second outer wall surface (32) being in contact with the first outer wall surface (31) and being located on a side of the first wall (13) away from the electrode assembly (20), the second outer wall surface (32) being provided with a third groove (321), the battery cell (81) further comprising: A first insulating member (50) disposed on a side of the first wall (13) remote from the electrode assembly (20) and having a first protrusion (51) engaged with the third groove (321).
  7. 7. The battery cell (81) according to claim 6, wherein the third groove (321) is provided continuously in the circumferential direction on the second outer wall surface (32), the first projection (51) includes a first annular fitting portion (511), and the first annular fitting portion (511) is fitted into the third groove (321).
  8. 8. The battery cell (81) of claim 6 wherein the electrode terminal (30) further has a flange (33) on a side of the first wall (13) adjacent the electrode assembly (20), the flange (33) extending outwardly relative to the first outer wall surface (31) in at least one direction perpendicular to the first direction (dr 1) and at least partially beyond an edge of the through hole (12).
  9. 9. The battery cell (81) of claim 6 wherein the first insulator (50) further has a second protrusion (52), the second protrusion (52) being located between the inner wall surface (121) and the first outer wall surface (31).
  10. 10. The battery cell (81) of claim 9 wherein the second protrusion (52) abuts the seal (40) in the first direction (dr 1).
  11. 11. The battery cell (81) according to claim 9, wherein the second protrusion (52) includes a second annular embedded portion (521), the inner wall surface (121) and the first outer wall surface (31) have a gap (g) in at least one direction perpendicular to the first direction (dr 1), a portion of the gap (g) on a side of the sealing member (40) remote from the electrode assembly (20) is defined as a first gap portion, and the second annular embedded portion (521) is fitted with the first gap portion.
  12. 12. The battery cell (81) of claim 6 wherein the first insulator (50) and the electrode terminal (30) are integrally formed to the first wall (13).
  13. 13. The battery cell (81) of claim 1 wherein the electrode terminal (30) further has a flange (33) on a side of the first wall (13) adjacent the electrode assembly (20), the flange (33) extending outwardly relative to the first outer wall surface (31) in at least one direction perpendicular to the first direction (dr 1) and at least partially beyond an edge of the through hole (12); the battery cell (81) further includes: A second insulating member (60) provided on a side of the first wall (13) adjacent to the electrode assembly (20) and located outside the through hole (12) in at least one direction perpendicular to the first direction (dr 1), Wherein the second insulator (60) has a support portion (61) between the first wall (13) and the flange (33) in the first direction (dr 1).
  14. 14. The battery cell (81) of claim 13 wherein the support portion (61) has a circumferentially continuous first chamfer (611) at a location adjacent an edge of the through hole (12).
  15. 15. The battery cell (81) of claim 14 wherein the second insulator (60) conforms to a surface of the first wall (13) outside an edge of the through hole (12), the first wall (13) having a circumferentially continuous second chamfer (131) at a location outside the edge of the through hole (12), the orthographic projection of the first chamfer (611) and the second chamfer (131) on a plane perpendicular to the first direction (dr 1) at least partially coinciding.
  16. 16. The battery cell (81) of claim 13 wherein the second insulator (60) is fixedly connected to the first wall (13) by heat staking.
  17. 17. The battery cell (81) of claim 1 wherein the seal (40) comprises a first seal ring (412), the first seal ring (412) having a ring bottom (4121) and first and second seal ring sides (4122, 4123) connected to the ring bottom (4121), the first seal ring side (4122) being located radially outward of the second seal ring side (4123) along the ring bottom (4121), and an expansion angle being formed between the first and second seal ring sides (4122, 4123), the first and second seal ring sides (4122, 4123) being located on a side of the ring bottom (4121) adjacent the electrode assembly (20).
  18. 18. A battery device (80), characterized by comprising: The battery cell (81) of any of claims 1 to 17.
  19. 19. An electrical device, comprising: the battery device (80) of claim 18.

Description

Battery cell, battery device and electricity utilization device Technical Field The disclosure relates to the field of battery technologies, and in particular, to a battery cell, a battery device and an electric device. Background The secondary battery, especially the lithium ion battery, has the advantages of high voltage, large specific energy, long cycle life, no pollution, wide working temperature range, small self-discharge and the like, is widely applied to the power equipment of portable electronic equipment, energy storage devices and large new energy electric automobiles, and has great significance for solving the pollution of human environment and energy crisis. With the widespread use of lithium ion batteries, the reliability of the use of the batteries is a problem of close concern to manufacturers. Disclosure of utility model In one aspect of the present disclosure, there is provided a battery cell including: a housing comprising a receiving cavity, the housing comprising at least one first wall provided with a through hole; An electrode assembly located within the receiving chamber; an electrode terminal at least partially disposed in the through hole and electrically connected to the electrode assembly, the electrode terminal including a first outer wall surface disposed in the through hole, the inner wall surface and the first outer wall surface of the through hole being substantially parallel to a first direction, the first direction being a thickness direction of the first wall, and And a seal member disposed between the inner wall surface and the first outer wall surface so as to seal the inner wall surface and the first outer wall surface. In this embodiment, the inner wall surface of the through hole and the first outer wall surface of the electrode terminal located in the through hole are set to be substantially parallel to the thickness direction of the first wall, and this relationship substantially parallel to the thickness direction of the first wall is beneficial to reducing the processing difficulty of the electrode terminal and the through hole, improving the processing precision, thereby reducing the processing error, and enabling each position between the electrode terminal and the through hole to still maintain sealing fit through the sealing member under the condition of allowing a certain degree of assembly error, improving the sealing effect, reducing the risk of leakage of electrolyte inside the battery cell or entry of external impurities inside the battery cell, and improving the reliability of the battery cell. In some embodiments, the angle between the inner wall surface and the first direction is less than or equal to 5 °, and/or the angle between the first outer wall surface and the first direction is less than or equal to 5 °. In this embodiment, the angle α1 between the inner wall surface and the first direction and/or α2 between the first outer wall surface and the first direction is 5 ° or less, which is equivalent to limiting the degree of deviation allowed by the substantial parallelism, and is advantageous in that the sealing engagement between the electrode terminal and the through hole is effectively maintained by the sealing member. In some embodiments, the first outer wall surface is provided with a first groove, and the seal has a portion located within the first groove. In this embodiment, the first groove may be used to define the position of the sealing member relative to the electrode terminal before the electrode terminal is mounted in the through hole, so that the holding effect of the sealing member on the electrode terminal can be achieved when the electrode terminal and the sealing member are mounted in the through hole, sliding of the sealing member on the electrode terminal is inhibited, the risk that the sealing member falls off or cannot reach a predetermined sealing position is reduced, and the sealing effect of the sealing structure is improved. In some embodiments, the inner wall surface is provided with a second groove, and the seal further has a portion located within the second groove. In the present embodiment, the first groove may enable the sealing member to be accurately fitted to the set position of the inner wall surface during the installation of the electrode terminal into the through hole. The sealing member is stably and reliably positioned in the assembly process of the electrode terminal by matching with the holding effect of the sealing member on the electrode terminal, so that the sealing effect of the sealing structure is improved. In some embodiments, the first groove is circumferentially continuous on the first outer wall surface and the second groove is circumferentially continuous on the inner wall surface, and the seal includes a seal ring that is respectively embedded in the first groove and the second groove. In this embodiment, the first groove and the second groove that set up in succession along circumference c