Battery cells, batteries, and power consumption devices
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2024-03-11
- Publication Date
- 2026-06-09
AI Technical Summary
【0006】 上記技術案では、第1のケース壁上に突出構造を設置し、注液孔を突出構造上に設置して、注液孔の孔内端が外側向きに第1のケース壁の内面よりもはみ出すようにすることによって、注液孔の高さを上げることができ、注液孔の内側に一部の収容空間が残され、バッファリングする作用を果たすことができる。このように、電池セルの製造、搬送又は使用中に、電解液が外にあふれ出る傾向にあると、外にあふれ出ようとする電解液が該収容空間内に入ることによって、電解液が注液孔からあふれ出る確率を低下させることができ、外にあふれ出た電解液が第1のケース壁及び第1のケース壁上の部品を汚染する問題を改善することに有利であり、それによって製造する時に注液速度を高めて電池セルの製造性を向上させることに有利であるとともに、電池セルの信頼性を向上させることに有利である。そして、注液孔の高さが上げられているため、注入された電解液の高さが注液孔の孔内端に達する時、電解液の注入高さは、第1のケース壁の内面よりも高くなり、それによってケース内の電解液の総注入量を増加させることに有利であり、さらに電池セルのサイクル寿命を向上させることに有利である。理解できるように、電池セルの使用中に、電解液の消費は、電池セルの内部の電解液の減少の引き起こし、電池セルの耐用年数に影響を与え、電解液の総注入量を増加させることにより、電池セルの耐用年数を向上させることに有利である。なお、電池セルの使用中に、電解液が反応に参加した後にガスが発生し、ケース内の圧力の増加を引き起こし、圧力が一定程度に達すると、信頼性の問題をもたらす。ケース内にガスが形成された時、注液孔の内側に残されている収容空間は、ガスをバッファリングする作用を果たすことができ、圧力の増加による信頼性の問題を改善することによって、電池セルの使用信頼性を向上させる。
Smart Images
Figure 2026518699000001_ABST
Abstract
Claims
1. It is a battery cell, A case that defines a housing cavity and includes a first case wall, wherein the surface of the first case wall facing the housing cavity is an inner surface and the surface of the first case wall away from the housing cavity is an outer surface, A battery cell comprising a protruding structure provided on the first case wall, at least a portion of which protrudes toward the side of the outer surface of the first case wall away from the housing cavity, wherein a liquid injection hole is formed on the protruding structure, and both ends of the liquid injection hole are an outer end and an inner end, respectively, and the outer end and the inner end are sequentially arranged along the direction from the outer surface to the inner surface of the first case wall, and the inner end is a protruding structure located toward the side of the inner surface of the first case wall away from the housing cavity.
2. The battery cell according to claim 1, wherein the inner end of the hole is located on the outer surface of the first case wall away from the housing cavity.
3. The aforementioned protruding structure is The battery cell according to claim 1 or 2, comprising a post structure provided on the first case wall, wherein the liquid injection hole is formed on the post structure.
4. The battery cell according to claim 3, wherein the post structure includes a post body and a post cover plate, the post body is provided on the first case wall, the post cover plate is provided covering the post body, a communication channel is formed on the post body that communicates with the housing cavity, and the liquid injection hole is formed on the post cover plate and communicates with the communication channel.
5. The battery cell according to claim 4, wherein the liquid injection hole is installed on the cathode post cover plate, and the material of the cathode post cover plate and the cathode post body are the same.
6. The battery cell according to claim 4, wherein the post cover plate includes a first cover plate portion and a second cover plate portion, the first cover plate portion is connected to the post body, the first cover plate portion and the post body are made of the same material, the second cover plate portion is connected to the first cover plate portion, and the liquid injection hole is installed on the first cover plate portion or the second cover plate portion.
7. The battery cell according to claim 4, wherein the communication channel includes a first housing groove and a liquid passage hole, the first housing groove is open toward the post cover plate and communicates with the liquid injection hole, and the liquid passage hole penetrates the groove wall of the first housing groove and connects the first housing groove and the housing cavity.
8. The battery cell according to claim 7, wherein the groove opening of the first housing groove is located on the side of the first housing groove away from the housing cavity, and the liquid passage hole is located on the side of the first housing groove closer to the housing cavity and penetrates the groove wall on the side of the first housing groove closer to the housing cavity.
9. The battery cell according to claim 7, wherein at least a portion of the post cover plate is fitted into the first housing groove.
10. The battery cell according to claim 7, wherein the edge of the post cover plate has a wrap portion, and the wrap portion wraps around the side of the post body away from the housing cavity.
11. The battery cell according to claim 7, wherein the surface of the post body away from the housing cavity has a counterbore groove that surrounds the first housing groove, and the edge of the post cover plate has an overlapping portion, at least a portion of which is fitted into the counterbore groove.
12. The battery cell according to claim 7, wherein the communicating channel further includes a second housing groove, the second housing groove is located on the side of the first housing groove closer to the housing cavity, the second housing groove is open toward the housing cavity and communicates with the housing cavity, and the liquid passage hole penetrates the groove wall of the second housing groove to connect the first housing groove and the second housing groove.
13. The battery cell according to claim 7, wherein the battery cell includes a battery core assembly, the battery core assembly includes an active material coating portion housed in the housing cavity and a conductive portion connected to the active material coating portion, a communication hole is formed on the post body that connects the first housing groove and the housing cavity, the communication hole is one or more, and at least one of the communication holes is the liquid passage hole, and the conductive portion is drilled in at least one of the communication holes and at least a portion of it is housed in the first housing groove.
14. The battery cell according to claim 13, wherein the communication hole through which the conductive portion is drilled is a first communication hole, and at least the first communication hole is the liquid passage hole.
15. The battery cell according to claim 13, wherein the communication hole through which the conductive portion is drilled is a first communication hole, and the communication hole is a plurality of and further includes at least one second communication hole through which the conductive portion is not drilled, and at least the second communication hole is the liquid passage hole.
16. The battery cell according to claim 13, wherein the groove wall of the first housing groove on the side closer to the housing cavity is a groove bottom wall, the conductive portion and the groove bottom wall are connected to form a first connection portion, and the orthogonal projection of the liquid injection hole onto the groove bottom wall and the first connection portion are offset from each other.
17. The battery cell according to claim 13, wherein the communication hole through which the conductive portion is drilled is a first communication hole, the post body is formed as an elongated structure, and the first communication hole is formed as an elongated hole whose longitudinal direction extends from one end of the length of the post body to the other end of the length.
18. The battery cell according to claim 17, wherein the post cover plate is a long cover plate, and the liquid injection hole is installed eccentrically in the longitudinal direction of the post cover plate.
19. The battery cell according to claim 7, wherein the battery cell includes a battery core assembly, the battery core assembly includes an active material coating portion housed in the housing cavity and a conductive portion connected to the active material coating portion, the conductive portion being connected to the wall surface of the post body facing the housing cavity.
20. The battery cell according to claim 7, wherein the liquid injection hole is installed opposite the liquid passage hole.
21. The battery cell according to claim 3, wherein the post structure includes a post body provided in the first case wall, the liquid injection hole is formed on the post body, and a housing groove communicating with the liquid injection hole is formed on the post body.
22. The battery cell according to claim 21, wherein the housing groove includes a third housing groove whose groove opening is open away from the housing cavity, and the liquid injection hole penetrates the groove wall of the third housing groove on the side closer to the housing cavity.
23. The battery cell according to claim 22, wherein the housing groove further includes a fourth housing groove whose groove opening is open toward the housing cavity, the fourth housing groove is located on the side of the third housing groove closer to the housing cavity, and the liquid injection hole penetrates the groove wall of the fourth housing groove away from the housing cavity, thereby connecting the third housing groove and the fourth housing groove.
24. The battery cell according to claim 22, wherein the post structure further includes a post cover plate that is placed over the post body and seals the groove opening of the third housing groove.
25. The battery cell according to claim 21, wherein the housing groove includes a fifth housing groove whose groove opening is open toward the housing cavity, and the liquid injection hole penetrates the groove wall of the fifth housing groove away from the housing cavity.
26. The aforementioned protruding structure is The battery cell according to claim 1 or 2, comprising a pressure relief structure provided on the first case wall, wherein there is a vulnerable region on the pressure relief structure and / or at the connection portion between the pressure relief structure and the first case wall, and the liquid injection hole is formed on the pressure relief structure.
27. The aforementioned protruding structure is The battery cell according to claim 1 or 2, comprising a boss structure integrally molded with the first case wall, wherein the case has a post structure and a pressure relief structure installed at a distance from the boss structure, and the liquid injection hole is formed on the boss structure.
28. The battery cell according to claim 27, wherein the case includes a third case wall installed on a side opposite to the first case wall, and at least one of the post structure and the pressure relief structure is provided on the third case wall.
29. The battery cell according to claim 1 or 2, wherein the liquid passage area at the outer end of the liquid injection hole is larger than the liquid passage area at the inner end of the liquid injection hole.
30. The battery cell according to claim 1 or 2, wherein the liquid injection hole includes a first hole segment and a second hole segment, the first hole segment is located upstream of the second hole segment along the liquid injection flow direction, the liquid passage area of the first hole segment gradually decreases or remains constant along the direction from the first hole segment to the second hole segment, the liquid passage area of the second hole segment gradually decreases or remains constant along the direction from the first hole segment to the second hole segment, and the liquid passage area at the outlet end of the first hole segment is greater than or equal to the liquid passage area at the inlet end of the second hole segment.
31. The battery cell according to claim 30, wherein the liquid injection hole is composed of a first hole segment and a second hole segment, the liquid passage area of the first hole segment gradually decreases along the direction from the first hole segment to the second hole segment, and the liquid passage area at the outlet end of the first hole segment is equal to the liquid passage area at the inlet end of the second hole segment.
32. The battery cell according to claim 30, wherein the liquid injection hole further includes a third hole segment, the third hole segment is located between the first hole segment and the second hole segment along the liquid injection flow direction, the liquid passage area of the third hole segment gradually decreases along the direction from the first hole segment to the second hole segment, the liquid passage area at the inlet end of the third hole segment is less than or equal to the liquid passage area at the outlet end of the first hole segment, and the liquid passage area at the outlet end of the third hole segment is equal to the liquid passage area at the inlet end of the second hole segment.
33. The battery cell according to claim 1 or 2, further comprising a sealing structure that engages with the protruding structure and seals the liquid injection hole.
34. The aforementioned sealing structure is A first sealing material, at least a portion of which is fitted into the injection hole and which seals the injection hole by interference fit, and / or The battery cell according to claim 33, further comprising a second sealing material provided to cover the outer end of the liquid injection hole and sealed to the protruding structure.
35. The battery cell according to claim 1 or 2, wherein the first case wall is an integrally molded cover plate, or the first case wall is integrally molded with at least one second case wall, the second case wall extends to one side in the thickness direction of the first case wall.
36. A battery comprising a busbar member and a battery cell according to claim 1 or 2, wherein the battery cell is a plurality and at least two are electrically connected via the busbar member.
37. A power consumption device including the battery described in claim 36.