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CN-122000570-A - Battery cell and battery with same

CN122000570ACN 122000570 ACN122000570 ACN 122000570ACN-122000570-A

Abstract

The invention provides a battery cell and a battery with the battery cell. The battery cell of the invention comprises a shell, a cap assembly and a winding core. The housing is of elongate configuration and has an opening at a top end, and the cap assembly is enclosed at the opening of the housing and defines together with the housing a receiving space in which the winding core is accommodated in a form-fitting manner. The cap assembly and the winding core are in direct contact and fixedly connected so as to realize direct electric conduction between the winding core and the cap assembly. The invention omits the bus bar between the conventional winding core and the cap assembly, thereby saving space. In the case of a certain battery length, this arrangement can enable the winding core to be made long and the capacity to be increased. Because the winding core and the cap component are directly connected in a conductive way, the electronic transmission path is shortened, the internal resistance is reduced, and the power supply efficiency of the battery is improved.

Inventors

  • HUANG XINYUE
  • Yi Dingxing
  • HAN ZHIQING
  • XU GANG

Assignees

  • 创科无线普通合伙

Dates

Publication Date
20260508
Application Date
20241107

Claims (12)

  1. 1. A cell (100) of a battery, the cell (100) comprising: a housing (12) having an elongated configuration and having an opening (125) at a top end; a cap assembly (13), the cap assembly (13) being enclosed at the opening (125) of the housing (12) and defining a receiving space together with the housing, and A winding core (11) which is accommodated in the accommodation space in a form-fitting manner, Wherein the cap assembly (13) and the winding core (12) are in direct contact and fixedly connected to achieve direct electrical conduction between the winding core (11) and the cap assembly (13).
  2. 2. The cell of claim 1, wherein the cap assembly (13) is integrally formed as a flat plate structure, and the entire top surface of the jellyroll (11) is in surface contact with the cap assembly (13).
  3. 3. The cell according to claim 1 or 2, wherein the cap assembly (13) comprises a cap body (131) almost covering the opening (125), an annular plate (133) surrounding the cap body, and an annular seal ring (132) fitted between the annular plate (133) and the cap body (131) and electrically isolating the annular plate (133) and the cap body (131), Wherein the winding core (11) and the cap body (131) are fixedly connected, the side wall (123) of the housing (12) and the annular plate (133) are fixedly connected, in particular, the winding core (11) and the cap body (131) are connected in a welding manner, and the side wall (123) of the housing (12) and the annular plate (133) are connected in a welding manner.
  4. 4. A cell according to claim 3, characterized in that the cap body (131) and the sealing ring (132) are provided with mutually matching structures at the junction, the sealing ring (132) and the annular plate (133) are provided with mutually matching structures at the junction, and the annular plate (133) and the side wall (123) of the housing (12) are provided with mutually matching structures at the junction.
  5. 5. The cell according to claim 3 or 4, wherein a circumferential side surface of the cap body (131) is provided with a first accommodation groove (1311) open toward the outside and extending integrally in the circumferential direction, at least a portion of the seal ring (132) being placed in the first accommodation groove (1311), In particular, the seal ring (132) is provided with a second accommodation groove (1321) opening to the outside along the entire circumference thereof, at least a part of the annular plate (133) is placed in the second accommodation groove (1321), Preferably, a radially inner end (1332) of the annular plate (133) is inserted into the second receiving groove (1321) and into the first receiving groove (1311) together with at least a portion of the sealing ring (132).
  6. 6. The cell of claim 5, wherein the seal ring (132) has a seal ring top wall (1322) defining the second receiving groove (1321), a seal ring bottom wall (1323) and a seal ring side wall (1324) connected between the seal ring top wall and the seal ring bottom wall, wherein the seal ring top wall (1322) and the seal ring bottom wall (1323) each extend radially outwardly beyond the cap body (131), preferably the seal ring top wall (1322), the seal ring bottom wall (1323) and the seal ring side wall (1324) are of equal thickness.
  7. 7. The cell according to claim 5 or 6, wherein the annular plate (133) engages with the sealing ring (132) in an interference fit and/or the sealing ring (132) engages with the cap body (131) in an interference fit, In particular, the annular plate (133) and the cap body (131) are each formed as a flat plate of uniform thickness.
  8. 8. The cell according to any one of claims 3 to 7, wherein a side wall (123) of the housing (12) is formed with a first step structure (122) at an opening end of the housing, a second step structure (1331) is also provided at a bottom circumferential position of the annular plate (133), the first step structure (122) and the second step structure (1331) are in a concave-convex fit, Preferably, the first step structure (122) comprises an outer step (1221) and an inner step (1222) that are radially adjacent, the outer step (1221) protruding towards the top with respect to the inner step (1222).
  9. 9. The cell according to any one of claims 2-8, wherein the cap assembly (13) is provided with an electrolyte inlet (1312) through the cap body (131), the cap assembly (13) further comprising an inlet cover plate (134) for covering the electrolyte inlet (1312), In particular, the winding core (11) and the cap body (131) are welded together along a welding track (1313), the electrolyte inlet (1312) being arranged around the welding track (1313), in particular, the welding track being radial, discrete point-like, spiral or concentric circle-like extending along the cap body, In particular, the electrolyte inlet (1312) is located at the centre of the cap body (131) or near the edge of the cap body.
  10. 10. The cell according to any of the claims 3-9, characterized in that the housing (12) and/or the cap assembly (13) is provided with a thinned area for use as an explosion-proof valve, preferably the thinned area has a thickness of 40-90% of the thickness of its adjoining area, In particular, the side wall (123) of the housing (12) is provided with a circumferentially extending groove (121) as an explosion-proof valve, preferably the groove (121) is located at an axial central position of the side wall (123) of the housing (12), In particular, the cap assembly (13) comprises an inlet cover plate (134) for covering the electrolyte inlet (1312), the thickness of the inlet cover plate (134) being smaller than the thickness of the cap body (131), such that the inlet cover plate (134) acts as an explosion-proof valve.
  11. 11. The cell according to any of the claims 1-10, characterized in that the bottom end of the winding core (11) and the bottom wall (124) of the housing (12) are fixedly connected to achieve a direct electrical conduction between the bottom wall (124) of the housing (12) and the winding core (11), In particular, no bus bar is arranged between the top end of the winding core (11) and the cover cap assembly (13), In particular, no bus bar is present between the bottom end of the winding core (11) and the bottom wall (124) of the housing (12).
  12. 12. Battery, characterized in that it comprises a plurality of cells (100) according to any one of claims 1 to 11, in particular a plurality of said cells being arranged in an array in a plane perpendicular to the axial direction (X) of the cells.

Description

Battery cell and battery with same Technical Field The invention relates to the field of batteries, in particular to a battery cell and a battery with the battery cell. Background Currently, the cells of a battery commonly found on the market comprise a winding core and a casing, the winding core being generally arranged in the casing to prevent the winding core from being damaged. Wherein, the shell is usually composed of a barrel with one side open and a cap assembly for closing the opening of the barrel, and the cap assembly is usually required to be provided with a groove for sealing, namely a rolling groove, on the barrel when the opening of the barrel is closed. Under the fixed condition of battery specification, the accommodation space of barrel is certain, and the existence of parts such as block subassembly, recess has taken up a part accommodation space of barrel, and the space that the core can take up is less than the accommodation space of barrel for the capacity of electric core is restricted. In addition, still be provided with the busbar in the electric core generally, also can occupy the accommodation space of a part of barrel, further extruded the accommodation space of a roll core, influence the promotion of electric core's capacity. Meanwhile, the above structures also make the processing technology of the battery cell more complex, and increase the production cost. In addition, there is also a need for low internal resistance batteries in the market, and the safety performance of existing batteries is also to be improved. Accordingly, there is a need to provide a battery cell and a battery having the same to at least partially solve the above-mentioned problems. Disclosure of Invention The invention aims to provide a battery cell and a battery with the battery cell. The coil core and the cap component of the battery core are directly welded and fixed and realize conductive connection, so that a bus bar between the conventional coil core and the cap component is omitted, and the space is saved. In the case of a certain battery length, this arrangement can enable the winding core to be made long and the capacity to be increased. Because the winding core and the cap component are directly connected in a conductive way, the electronic transmission path is shortened, the internal resistance is reduced, and the power supply efficiency of the battery is improved. Furthermore, the circumference of the cap assembly of the battery cell is provided with a unique sealing structure, and the sealing structure enables the cap assembly to be tightly jointed with the shell, so that the use stability of the battery cell can be effectively improved, and the service life of the battery cell can be prolonged. The invention also provides some preferential settings of the explosion-proof valve and the electrolyte injection hole, which improves the overall performance of the battery core, especially the safety performance in multiple aspects. According to an aspect of the present invention, there is provided a battery cell of a battery, the battery cell including: a housing having an elongated configuration and an opening at a top end; a cap assembly, which is enclosed at the opening of the housing and defines a containing space together with the housing, and A winding core, which is accommodated in the accommodation space in a form-fitting manner, Wherein, the cap assembly and the winding core are in direct contact and fixedly connected so as to realize direct electric conduction between the winding core and the cap assembly. In one embodiment, the cap assembly is integrally formed as a flat plate structure, and the entire top surface of the winding core is in surface contact with the cap assembly. In one embodiment, the cap assembly includes a cap body that almost covers the opening, an annular plate surrounding the cap body, and an annular seal ring fitted between and electrically isolating the annular plate and the cap body, The roll core is fixedly connected with the cap main body, the side wall of the shell is fixedly connected with the annular plate, particularly the roll core is connected with the cap main body in a welding mode, and the side wall of the shell is connected with the annular plate in a welding mode. In one embodiment, the cap body and the sealing ring are provided with mutually matching structures at the junction, the sealing ring and the annular plate are provided with mutually matching structures at the junction, and the annular plate and the side wall of the housing are provided with mutually matching structures at the junction. In one embodiment, the circumferential side surface of the cap body is provided with a first accommodation groove which is open toward the outside and extends integrally in the circumferential direction, at least a part of the seal ring is placed in the first accommodation groove, In particular, the sealing ring is provided with a second accommodation groove w