Battery cell

Abstract

The utility model relates to a battery cell, which comprises a shell, a battery cell and a battery cell, wherein a cavity is defined on the inner side of the shell, and the shell is provided with an opening communicated with the cavity; the roll core is accommodated in the cavity; the covering structure comprises a cover body and two groups of pole assemblies, the cover body is mounted at the opening, two accommodating cavities are formed in the cover body at intervals, each accommodating cavity is arranged in a penetrating manner in the thickness direction of the cover body and is provided with a first end and a second end opposite to the first end in the axial direction, and the second end is arranged towards the roll core; the two groups of pole assemblies are embedded in the accommodating cavities in a one-to-one correspondence manner and are conductively connected with the roll core, and a set distance is reserved between each pole assembly and the end face where the first end is located. The battery cell is embedded in the accommodating cavity of the cover body of the covering structure in a one-to-one correspondence manner through the pole column assemblies and is conductively connected with the roll core, and a set distance is reserved between the pole column assemblies and the first end of the accommodating cavity, so that the overall attractive effect of the battery cell is improved, the short circuit risk caused by exposure of the pole columns is avoided, the material and length of the pole columns are reduced, and the manufacturing cost of the pole columns is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery core. Background Art

[0002] The battery cell in the related art usually includes a cover plate and a pole. The cover plate is provided with a receiving cavity for installing the pole. The pole part passes through the receiving cavity, and a part of the surface protruding from the cover plate is usually left. The pole is usually long, which not only affects the appearance, but also easily causes a short circuit between the pole and external metal parts, resulting in safety hazards, and also increases the manufacturing cost. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an improved battery core.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a battery core, including:

[0005] A shell body, the inner side of which defines a cavity and has an opening communicating with the cavity;

[0006] A winding core, accommodated in the cavity;

[0007] A covering structure comprises a cover body and two groups of pole assemblies, wherein the cover body is installed on the opening, and two accommodating cavities are arranged on the cover body at intervals, each of the accommodating cavities is arranged through the thickness direction of the cover body, and has a first end and a second end arranged opposite to the first end in the axial direction, wherein the second end is arranged toward the winding core; the two groups of pole assemblies are embedded in the accommodating cavities one by one, and are conductively connected to the winding core, and a set distance is left between each of the pole assemblies and the end face where the first end is located.

[0008] In some embodiments, the cover body includes a sheet-shaped covering portion and two annular portions; the two annular portions are spaced apart on a side of the covering portion facing the winding core, and each of the annular portions defines a accommodating cavity.

[0009] In some embodiments, a limiting structure is provided at the first end of the accommodating cavity, and the limiting structure is ring-shaped;

[0010] A gap is left between the limiting structure and the pole assembly.

[0011] In some embodiments, the pole assembly includes a pole and a wrapping member sleeved around the outer circumference of the pole.

[0012] In some embodiments, an explosion-proof structure is disposed on the cover body, and the explosion-proof structure is disposed between the two accommodating cavities.

[0013] In some embodiments, a liquid injection hole is provided on the cover body, and the liquid injection hole is provided between the two accommodating cavities.

[0014] In some embodiments, the covering structure further includes a bracket, the bracket is installed in the shell, and a slot matching with the annular portion is provided on the bracket.

[0015] In some embodiments, the battery cell further includes a conductive connector, which is arranged in a one-to-one correspondence with the pole assembly and can be partially inserted into the slot to be connected to the pole assembly; the conductive connector is connected to the winding core.

[0016] In some embodiments, a through hole is provided on the bottom surface of the card slot, and the conductive connector includes a sheet body and a conductive protrusion provided on one side of the sheet body; the sheet body is connected to the winding core, and the conductive protrusion passes through the through hole and is connected to the pole assembly.

[0017] In some embodiments, the covering structure further includes an insulating sheet, which is disposed on a side of the cover body that is opposite to the winding core, and the insulating sheet is provided with vias corresponding to the accommodating cavity.

[0018] The implementation of the battery cell of the utility model has the following beneficial effects: the battery cell is embedded in the accommodating cavity of the cover body of the covering structure through the pole assembly one by one, and is conductively connected to the winding core, and a set distance is left between each pole assembly and the first end of the accommodating cavity, thereby improving the overall aesthetic effect of the battery cell, avoiding the risk of short circuit due to exposure of the pole, reducing the material and length of the pole, reducing the manufacturing cost of the pole, and improving performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1 It is a schematic diagram of the structure of the battery cell in some embodiments of the utility model;

[0021] Figure 2 yes Figure 1 A cross-sectional view of the battery cell shown;

[0022] Figure 3 yes Figure 2 A schematic diagram of the partial structural decomposition of the battery cell shown;

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure of the cover structure in the battery cell shown;

[0024] Figure 5 yes Figure 4 A cross-sectional view of the cover structure shown;

[0025] Figure 6 yes Figure 5 A schematic diagram of the structural decomposition of the cover structure shown;

[0026] Figure 7 yes Figure 6 A schematic diagram of the cover structure of the cover structure shown;

[0027] Figure 8 yes Figure 7 A schematic diagram of the structure of the cover body at another angle;

[0028] Fig. 9 yes Figure 1 Schematic diagram of the pole assembly structure of the covered structure shown. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation", "setting" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.

[0030] Figures 1 to 3 Some preferred embodiments of the battery cell of the utility model are shown. The battery cell can be used to supply power to some electrical equipment. The battery cell has the advantages of overall beauty, high safety performance, easy installation and convenient maintenance.

[0031] like Figures 1 to 3 As shown, the battery cell may include a shell 10, a winding core 20, and a covering structure 30. The shell 10 can be used to accommodate the winding core 20. In some embodiments, the shell 10 may be roughly rectangular, and its inner side is hollow. A cavity 11 may be defined on the inner side of the shell 10. An opening 12 is provided on one side of the shell 10, and the opening 12 may be connected to the cavity 11. The winding core 20 is accommodated in the cavity 11, which can generate electrical energy and output electrical energy. A pole ear 21 may be provided at one end of the winding core 20 facing the opening 12. The covering structure 30 may be provided to cover the opening 12.

[0032] like Figures 4 to 6 As shown, the cover structure 30 may include a cover body 31, a pole assembly 32, and a bracket 33. The cover body 31 may be installed on the opening 12 to cover the opening 12. The pole assembly 32 may be two groups, and the two groups of pole assemblies 32 may be embedded in the cover body 31. The bracket 33 is installed in the housing 10 and is detachably assembled with the cover body 31.

[0033] like Figure 7 and Figure 8 As shown, further, in some embodiments, the cover body 31 can be a plain aluminum sheet. The cover body 31 includes a covering portion 311 and two annular portions 312. The covering portion 311 can be roughly sheet-shaped, and its shape and size can be adapted to the shape and size of the opening 12. In some embodiments, the covering portion 311 can be roughly rectangular. There can be two annular portions 312, and the two annular portions 312 can be spaced apart on the side of the covering portion 311 facing the winding core 20. The annular portion 312 can be annular, and it can be integrally formed with the covering portion 311. In some embodiments, two accommodating cavities 313 can be spaced apart on the cover body 31, and the accommodating cavities 313 can be opened on the covering portion 311, and each accommodating cavity 313 is arranged through the thickness direction of the cover body 31, and it can penetrate to the annular portion 312, that is, a accommodating cavity 313 can be defined on the inner side of each annular portion 312. In some embodiments, the accommodating cavity 313 may have a first end 313a and a second end 313b in the axial direction, wherein the first end 313a and the second end 313b are arranged opposite to each other. The second end 313b may be arranged toward the winding core. The annular portion 312 has an annular support wall 3121 at the second end 313b of the accommodating cavity 313, and the support wall 3121 can be used to support the pole assembly 32.

[0034] In some embodiments, the first end 313a of the accommodating cavity 313 is provided with a limiting structure 3131, and the limiting structure 3131 can be a flange extending radially inwardly along the accommodating cavity 313, and the limiting structure 3131 can be annular, which can be used to prevent the pole assembly 32 from coming out. In some embodiments, a gap 3132 is left between the limiting structure 3131 and the pole assembly 32, that is, a set distance is left between the pole assembly 32 and the end face of the first end 313a, and the gap 3132 can form a slot for inserting the connection terminal of the external device into the accommodating cavity 313 to connect with the pole assembly 32, thereby realizing the electrical connection between the battery cell and the external device, and then it can replace the bolts and laser welding method of the PACK connection used in the related art to connect with the pole assembly 32, thereby improving the connection efficiency, facilitating the realization of automated production, and facilitating maintenance, which is conducive to improving the connection stability.

[0035] In some embodiments, a mounting hole 314 may be provided on the cover body 31 . The mounting hole 314 is provided on a side opposite to the covering portion 311 and the annular portion 312 . The mounting hole 314 may be located between the two accommodating cavities 313 and may be used for installing the explosion-proof structure 35 .

[0036] In some embodiments, the cover body 31 is provided with a liquid injection hole 315, which is specifically provided on the cover portion 311 and located between the two accommodating cavities 313. Specifically, the liquid injection hole 315 can be provided between the mounting hole 314 and one of the accommodating cavities 313. The liquid injection hole 315 can be used to inject electrolyte into the winding core 20.

[0037] like Figure 5 , Figure 6 and Fig. 9 As shown, in some embodiments, the pole assembly 32 is entirely accommodated in the accommodating cavity 313 and supported by the supporting wall 3121. That is, the length of the pole assembly 32 can be reduced while ensuring that the cross section remains unchanged, thereby preventing the risk of short circuit caused by the exposure of the battery cell pole 32, reducing internal resistance, and improving electrical performance; and the material used in the pole assembly 32 can also be reduced, thereby reducing manufacturing costs. The pole assembly 32 may include a pole 321 and a wrapping member 322, and the pole 321 may be roughly cylindrical. The wrapping member 322 may be an insulating member, which may be sleeved on the outer periphery of the pole. When the pole assembly 32 is installed, the wrapping member 322 may be sleeved on the outer periphery of the pole 321, and then the two may be loaded into the accommodating cavity 313 together.

[0038] In some embodiments, the bracket 33 may include a support portion 331 and an embedding portion 332. The support portion 331 may be substantially in the shape of a flat plate, which may be fitted with the covering portion 311, and thus may play a role in supporting the covering portion 311. The embedding portion 332 is disposed on the side of the support portion 331 that is disposed opposite to the covering portion 311. There may be two embedding portions 332, which may be located on two opposite sides of the support portion 331, and may be embedded in the housing 10 from the opening 12. In some embodiments, a slot 333 is provided on the bracket 33, and the slot 333 may be provided on the support portion 331, and may be used for the annular portion 312 of the cover body 31 to be inserted. The cross-sectional shape and size of the slot 333 may be adapted to the cross-sectional shape and size of the annular portion 312. The annular portion 312 may be fixed to the slot 333 by interference fit. In some embodiments, a through hole 3331 is disposed on the bottom surface of the slot 333 , and the through hole 3331 can be used for the conductive connector 37 to penetrate and connect with the pole assembly 32 .

[0039] In some embodiments, the cover structure 30 further includes an insulating sheet 34, which may be in the form of a sheet. In some embodiments, the insulating sheet 34 may be a plastic sheet, and its cross-sectional shape and size may be adapted to the shape and size of the cover portion 311. In some embodiments, the insulating sheet 34 may be disposed on the side of the cover body 31 that is disposed opposite to the winding core 20. The insulating sheet 34 may be provided with a via 341 corresponding to the accommodating cavity 313, and the via 341 may be two, and the two vias 341 may be disposed at intervals and communicate with the accommodating cavity 313 in a one-to-one correspondence.

[0040] In some embodiments, the cover structure 30 further includes an explosion-proof structure 35, which is disposed on the cover body 31 and between the two accommodating cavities 313, and is specifically installed in the installation hole 314. The explosion-proof structure 35 may include an explosion-proof valve.

[0041] In some embodiments, the cover structure 30 may further include a seal 36, which may be a sealing ring, which may be disposed in the gap 3132 between the pole assembly 32 and the limiting structure 3131, and is coaxially disposed with the pole assembly 32. The seal 36 may be in close contact with the pole assembly 32 and the inner wall of the limiting structure 3131.

[0042] In some embodiments, the battery cell may further include a conductive connector 37 connected to the winding core 20, and the conductive connector 37 may be used to connect the pole assembly 32 to the winding core 20. In some embodiments, the conductive connector 37 may be arranged one-to-one with the pole assembly 32, and may be partially inserted into the card slot 333 to connect with the pole assembly 32. In some embodiments, the conductive connector 37 may be generally sheet-shaped. The conductive connector 37 may be a conductive metal sheet, such as a copper sheet. In some embodiments, the conductive connector 37 may include a sheet 371 and a conductive protrusion 372, and the sheet 371 may be connected to the winding core 20, specifically, it may abut against the pole ear 21 on the winding core 20. The conductive protrusion 372 is arranged on one side of the sheet 371, which is located on the side of the sheet 371 facing the bracket 33, and may be inserted into the card slot 333 from the through hole 3331 to connect with the pole assembly 32, thereby realizing the conductive connection between the winding core 20 and the pole assembly 32.

[0043] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A battery cell, characterized in that: include: A housing (10) defining a cavity (11) on its inner side and having an opening (12) communicating with the cavity (11); A winding core (20) is accommodated in the cavity (11); A cover structure (30) comprises a cover body (31) and two groups of pole assemblies (32), wherein the cover body (31) is mounted on the opening (12), and two accommodating cavities (313) are arranged at intervals on the cover body (31), each of the accommodating cavities (313) is arranged to penetrate along the thickness direction of the cover body (31), and has a first end (313a) and a second end (313b) arranged opposite to the first end (313a) in the axial direction, wherein the second end (313b) is arranged toward the winding core (20); the two groups of pole assemblies (32) are embedded in the accommodating cavities (313) in a one-to-one correspondence, and are conductively connected to the winding core (20), and a set distance is left between each of the pole assemblies (32) and the end face where the first end (313a) is located.

2. The battery cell according to claim 1, characterized in that: The cover body (31) comprises a sheet-shaped covering portion (311) and two annular portions (312); the two annular portions (312) are arranged at intervals on a side of the covering portion (311) facing the winding core (20), and each of the annular portions (312) defines a receiving cavity (313).

3. The battery cell according to claim 1, characterized in that: The first end (313a) of the accommodating cavity (313) is provided with a limiting structure (3131), and the limiting structure (3131) is ring-shaped; A gap (3132) is provided between the limiting structure (3131) and the pole assembly (32).

4. The battery cell according to claim 1, characterized in that: The pole assembly (32) comprises a pole (321) and a wrapping member (322) sleeved on the outer circumference of the pole (321).

5. The battery cell according to claim 1, characterized in that: An explosion-proof structure (35) is provided on the cover body (31), and the explosion-proof structure (35) is arranged between the two accommodating cavities (313).

6. The battery cell according to claim 1, characterized in that: The cover body (31) is provided with a liquid injection hole (315), and the liquid injection hole (315) is arranged between the two accommodating cavities (313).

7. The battery cell according to claim 2, characterized in that: The covering structure (30) further comprises a bracket (33), wherein the bracket (33) is installed in the housing (10), and a slot (333) cooperating with the annular portion (312) is provided on the bracket (33).

8. The battery cell according to claim 7, characterized in that: The battery core also includes a conductive connector (37), which is arranged in a one-to-one correspondence with the pole assembly (32) and can partially penetrate the slot (333) to be connected to the pole assembly (32); the conductive connector (37) is connected to the winding core (20).

9. The battery cell according to claim 8, characterized in that: The bottom surface of the slot (333) is provided with a through hole (3331), and the conductive connecting member (37) includes a sheet (371) and a conductive protrusion (372) provided on one side of the sheet (371); the sheet (371) is connected to the winding core (20), and the conductive protrusion (372) penetrates through the through hole (3331) to be connected to the pole assembly (32).

10. The battery cell according to claim 1, characterized in that: The covering structure (30) further comprises an insulating sheet (34), wherein the insulating sheet (34) is arranged on a side of the cover body (31) opposite to the winding core (20), and the insulating sheet (34) is provided with a via hole (341) corresponding to the accommodating cavity (313).

Images