Battery cell tab switching structure, battery cell top cover and battery cell

Abstract

The utility model relates to a battery cell tab switching structure, a battery cell top cover and a battery cell. Relates to the technical field of new energy batteries. The device specifically comprises a pole base fixedly provided with a pole and a switching piece used for being connected with a tab, and the pole base is fixedly connected with the switching piece; the switching piece comprises a tab connecting part fixedly connected with the tab and a pole connecting part fixedly connected with the pole base. The cross sectional area of the pole base is larger than that of the pole connecting part, the overlapped projection side lines of the pole connecting part and the pole base form the connecting side line of the pole connecting part and the pole base, the connecting side line is far away from the edge of the pole base, and the laser welding equipment is arranged along the connecting side line of the pole connecting part and the pole base on the basis of the connecting side line of the pole connecting part and the pole base. And the pole base and the pole connecting part are fused together, so that the welding of the switching piece and the pole base is simpler and more convenient and is easy to implement, the production cost is further reduced, and the product yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a battery cell tab adapter structure.

[0002] structure, cell cover and cell. Background Art

[0003] Currently, front-shell lithium-ion batteries are increasingly used in new energy vehicles, and demand is rapidly expanding. Battery safety is the cornerstone of promoting the application of lithium-ion batteries in new energy vehicles. In the existing battery cell assembly process, the tabs of the bare battery cell are usually connected to the terminal base on the battery cover through an adapter, thereby achieving conductivity between the tabs and the terminal. The bare battery cell is then installed into the battery cell housing. Finally, the battery cover is fixedly connected to the battery cell housing, so that the battery cover seals the battery cell housing. The bare battery cell tabs enclosed in the battery cell housing are then led out through the exposed terminal on the battery cover, realizing the charging and discharging functions of the lithium-ion battery cell.

[0004] In the prior art, the connection between the adapter and the pole base is typically achieved through laser welding. During laser welding, the adapter is aligned with the pole base. At a point away from the pole base and the edge of the adapter, the laser welding equipment penetrates the adapter, fusing the pole base and adapter together to form a weld.

[0005] However, this welding method is difficult because there is no clear guidance on the formation position of the weld. (If manual welding is used, the accuracy and consistency of the weld position require a high level of worker proficiency; if machine welding is used, the machine's positioning, detection and other programming are more complex), which leads to increased processing costs and an increase in product defective rates.

[0006] Furthermore, with the advancement of battery technology, cell capacities are increasing, and the internal adapters are becoming thicker to ensure adequate current handling. Thicker adapters require more powerful laser welding equipment to weld to the terminal base. Higher laser welding power generates higher temperatures, which can damage the plastic components near the terminal, potentially causing cell seal failure and compromising safety. Utility Model Content

[0007] The purpose of the present utility model is to address the deficiencies of the above-mentioned prior art and provide a battery cell tab adapter structure, a battery cell top cover and a battery cell, so that the welding of the adapter plate and the pole base is simpler and more convenient, easy to implement, and reduces the power demand for the welding equipment, thereby reducing production costs and improving product yield, while protecting the sealing integrity of the battery cell and ensuring the safety performance of the battery cell.

[0008] The utility model proposes a battery cell tab adapter structure, comprising a pole base with a pole fixedly provided, and an adapter plate for connecting the pole tab, wherein the pole base is fixedly connected to the adapter plate; the adapter plate comprises a pole tab connecting portion fixedly connected to the pole tab, and a pole connecting portion fixedly connected to the pole base, the cross-sectional area of ​​the pole base is larger than the cross-sectional area of ​​the pole connecting portion, the pole extends outside the pole base, and the overlapping projection edge line of the pole connecting portion and the pole base forms a connecting edge line between the two, and the connecting edge line is away from the edge of the pole base.

[0009] Furthermore, a first connection plane is provided on the inner side of the pole base, a second connection plane is provided on the pole connecting portion, and the first connection plane and the second connection plane are on the same horizontal plane.

[0010] Furthermore, a groove is provided on the inner side of the pole base, the pole connecting portion is nested in the groove, the first connecting plane is the top plane of the groove, and the second connecting plane is the top plane of the pole connecting portion.

[0011] Furthermore, the depth of the groove is equal to the thickness of the pole connecting portion, and the thickness of the pole base is equal to the thickness of the tab connecting portion.

[0012] Furthermore, a current column is provided in the groove, a current hole is provided on the pole connecting portion, and the current column is plugged into the current hole.

[0013] The present utility model also provides a battery cell top cover, comprising the above-mentioned battery cell tab transfer structure, and also comprising a cover plate body and a lower plastic. The battery cell tab transfer structure is fixedly mounted on the cover plate body, and the lower plastic is arranged between the battery cell tab transfer structure and the top cover body to insulate the battery cell tab transfer structure.

[0014] Furthermore, the cover body and the lower plastic are provided with through holes for the pole to pass through, and the battery cell top cover also includes a sealing ring provided between the pole and the through hole, and the sealing ring is used to seal the gap between the pole and the through hole.

[0015] Furthermore, the cell top cover further includes a welding ring sleeved on the outside of the pole, and the welding ring is fixedly connected to the cover body to fix the pole on the cover body.

[0016] Furthermore, a limiting groove is provided in the welding ring, one end of the sealing ring extends in the through hole and the other end extends outside the through hole, and the end of the sealing ring extending outside the through hole is inserted into the limiting groove.

[0017] The present invention also provides a battery cell, comprising the above-mentioned battery cell top cover, a shell, and a bare battery cell arranged in the shell, wherein the cover plate body seals the shell, and the tabs of the bare battery cell are fixedly connected to the tab connecting portion.

[0018] The battery cell tab transfer structure, battery cell top cover, and battery cell proposed in the utility model have the following beneficial effects:

[0019] (1) The cross-sectional area of ​​the pole base of the adapter structure is larger than the cross-sectional area of ​​the pole connection portion. The overlapping projection edge of the pole connection portion and the pole base forms a connecting edge between the two, and the connecting edge is away from the edge of the pole base. With the connecting edge of the two as a reference, the laser welding equipment melts the pole base and the pole connection portion together along the connecting edge, thereby making the welding of the adapter plate and the pole base simpler, more convenient, and easier to implement, thereby reducing production costs and improving product yield;

[0020] (2) When welding the pole base and the adapter plate of the adapter structure, it is not necessary to use laser welding equipment to penetrate the pole connection part. Therefore, for welding the adapter plate with a larger thickness to the pole base, it is possible to avoid using high-power laser welding equipment, thereby reducing the power demand for the welding equipment and preventing the high temperature generated by welding from damaging the plastic parts near the pole base, thereby protecting the sealing integrity of the battery cell and ensuring the safety performance of the battery cell;

[0021] (3) A first connection plane is provided on the inner side of the pole base of the adapter structure, and a second connection plane is provided on the pole connection portion. When the pole connection portion is in contact with the pole base at a position away from the edge, the second connection plane and the first connection plane are on the same horizontal plane. The laser welding equipment melts the intersection of the second connection plane and the first connection plane along the edge line of the second connection plane, thereby making the welding operation of the laser welding equipment easier to achieve;

[0022] (4) A groove is provided on the inner side of the pole base of the adapter structure, and the pole connection part is nested in the groove. The groove can guide the position of the pole connection part and the pole base, making the welding operation simpler and more convenient, and easy to implement. The nesting of the pole connection part and the groove makes the welding of the pole connection part and the pole base more stable, thereby enhancing the stability of the battery cell structure and ensuring the safety performance of the battery cell;

[0023] (5) An overcurrent column is provided in the groove of the transfer structure, and an overcurrent hole is provided on the pole connection part. When the pole connection part is nested in the groove, the overcurrent column is plugged into the overcurrent hole. Since the overcurrent column and the pole base are an integrated structure, the contact area between the pole base and the pole connection part can be increased by plugging the overcurrent column into the overcurrent hole, thereby increasing the overcurrent capacity of the cell tab transfer structure, thereby making the conductivity between the tab and the pole stronger, and ensuring the charge and discharge performance of the cell;

[0024] (6) The cell top cover also includes a sealing ring, which is arranged between the pole and the through hole of the cover body. The sealing ring separates the pole from the cover body. On the one hand, the pole is insulated to further prevent the cover body from being charged; on the other hand, the sealing ring seals the gap between the pole and the through hole on the cover body, thereby enhancing the sealing of the cell and ensuring the safety performance of the cell.

[0025] (7) A limiting groove is provided in the welding ring of the top cover of the battery cell. When the sealing ring is sleeved on the outside of the pole, one end of the sealing ring extends inside the through hole of the cover body, and the other end extends outside the through hole of the cover body. When the welding ring is sleeved on the end of the pole extending outside the cover body, the end of the sealing ring extending outside the through hole of the cover body is inserted into the limiting groove. Thus, through the cooperation between the sealing ring and the limiting groove, the sealing of the battery cell is further enhanced, the safety performance of the battery cell is guaranteed, and the stability of the battery cell structure is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model. In the accompanying drawings, like reference numerals are used to represent like elements.

[0027] Figure 1 This is a structural schematic diagram of a battery cell tab adapter structure according to an embodiment of the utility model;

[0028] Figure 2 This is a structural schematic diagram of a pole base of a battery cell tab adapter structure according to an embodiment of the present utility model;

[0029] Figure 3 This is a structural schematic diagram of an adapter sheet of a battery cell tab adapter structure according to an embodiment of the present utility model;

[0030] Figure 4 This is a cross-sectional schematic diagram of a battery cell tab adapter structure fixedly installed on a battery cell top cover according to an embodiment of the utility model;

[0031] Figure 5 This is a structural schematic diagram of a welding ring of a battery cell top cover according to an embodiment of the utility model;

[0032] Figure 6 This is an exploded view of the assembly of a battery cell according to an embodiment of the present utility model;

[0033] Figure 7 This is a schematic structural diagram of a battery cell according to an embodiment of the present utility model.

[0034] In the figure: 1. Shell; 2. Battery cell top cover; 21. Cover body; 22. Lower plastic; 23. Sealing ring; 24. Welding ring; 241. Limiting groove; 3. Battery cell tab adapter structure; 31. Pole base; 311. Pole; 312. First connection plane; 313. Groove; 314. Current column; 32. Adapter; 321. Tab connection part; 322. Pole connection part; 3221. Second connection plane; 3222. Current hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 7 , a battery cell tab adapter structure 3 of an embodiment of the present invention includes a pole base 31 on which a pole 311 is fixed, and a adapter plate 32 for connecting the pole tab, the pole base 31 is fixedly connected to the adapter plate 32; the adapter plate 32 includes a pole tab connecting portion 321 fixedly connected to the pole tab, and a pole connecting portion 322 fixedly connected to the pole base 31, the cross-sectional area of ​​the pole base 31 is larger than the cross-sectional area of ​​the pole connecting portion 322, the pole 311 extends outside the pole base 31, and the overlapping projection edge line of the pole connecting portion 322 and the pole base 31 forms a connecting edge line between the two, and the connecting edge line is away from the edge of the pole base 31.

[0037] In the present application, the battery cell tab adapter structure 3 includes a pole base 31 and an adapter plate 32. A pole 311 is arranged on the pole base 31, and the pole 311 extends on the outside of the pole base 31. One end of the adapter plate 32 is fixedly connected to the tab of the bare battery cell, and the other end is fixedly connected to the inner side of the pole base 31, so that the pole base 31 and the adapter plate 32 can realize conduction between the tab of the bare battery cell and the pole 311, and then the pole 311 is electrically connected to the external equipment to realize the charging and discharging function of the battery cell.

[0038] Specifically, in the present application, the adapter plate 32 includes a pole ear connection portion 321 and a pole connection portion 322. The pole ear connection portion 321 is used to be fixedly connected to the pole ear of the bare battery cell, and the pole connection portion 322 is used to be fixedly connected to the inner side of the pole base 31, thereby realizing conduction between the pole ear of the bare battery cell and the pole 311 through the pole base 31 and the adapter plate 32, and then electrically connecting with external equipment through the pole 311 to realize the charging and discharging function of the battery cell.

[0039] In the prior art, the cross-sectional area of ​​the adapter plate 32 is equal to that of the pole base 31. During welding, since the pole base 31 is already fixed to the battery cell top cover 2, to prevent damage to the plastic parts near the pole base 31, the adapter plate 32 is usually first aligned with the end of the pole base 31 that covers the inside of the battery cell top cover 2. Then, a laser welding device is used to penetrate the adapter plate 32 at a position away from the edge of the adapter plate 32, fusing the pole base 31 and the adapter plate 32 together to form a weld, thus completing the welding of the adapter plate 32 to the pole base 31.

[0040] This welding method is difficult because there is no clear guidance on the formation position of the weld. (If manual welding is used, the accuracy and consistency of the weld position require a high level of worker proficiency. If machine welding is used, the positioning, detection and other programming of the machine are more complex.) This leads to increased processing costs and an increase in product defect rates.

[0041] As battery technology advances, cell capacities are increasing, and the adapter plates 32 inside the cells are becoming thicker to ensure adequate current flow. The thicker the adapter plate 32, the greater the power required for laser welding equipment to penetrate it. Higher laser welding power, however, generates higher temperatures.

[0042] When the pole base 31 is fixed on the battery cell top cover 2, a plastic part is usually set near the pole base 31 to insulate and seal the pole 311. Therefore, the high temperature generated by the laser welding equipment during welding will cause the plastic part near the pole base 31 to be damaged, which may cause abnormal sealing of the battery cell and affect the safety performance of the battery cell.

[0043] In the present application, the cross-sectional area of ​​the pole base 31 is larger than the cross-sectional area of ​​the pole connection portion 322. It is foreseeable that the pole 311 and the pole base 31 are an integrated structure. When the pole connection portion 322 is fixedly connected to the pole base 31, the pole connection portion 322 can be aligned with the position of the pole base 31 away from the edge, and the overlapping projection edge line of the pole connection portion 322 and the pole base 31 forms the connection edge line of the two. With the connection edge line of the two as a reference, the laser welding equipment is used to melt the pole base 31 and the pole connection portion 322 together along the connection edge line of the two, thereby achieving a fixed connection between the pole connection portion 322 and the pole base 31.

[0044] Since in the present application, the overlapping projection edges of the pole connecting portion 322 and the pole base 31 form the connecting edge between the two, the laser welding equipment melts the pole base 31 and the pole connecting portion 322 together along the connecting edge between the two, thereby making the welding of the adapter 32 and the pole base 31 simpler, more convenient, and easier to implement, thereby reducing production costs and improving product yield.

[0045] In addition, in the present application, when welding the adapter plate 32 and the pole base 31, there is no need for laser welding equipment to penetrate the pole connecting portion 322. Therefore, for welding the adapter plate 32 with a larger thickness and the pole base 31, it is possible to avoid using high-power laser welding equipment, thereby reducing the power demand for the welding equipment and preventing the high temperature generated by welding from damaging the plastic parts near the pole base 31, thereby protecting the sealing integrity of the battery cell and ensuring the safety performance of the battery cell.

[0046] In this application, the cell cover 2 is fixedly mounted on the cell housing 1 from top to bottom. Therefore, in this embodiment, the terms "inside" and "outside" refer to the side inside the housing 1 when the cell cover 2 is mounted on the housing 1, and the side outside the housing 1 is the outside. In this embodiment, welding the adapter 32 to the pole base 31 is not limited to laser welding; other welding methods, such as arc welding and plasma welding, may also be used.

[0047] In this embodiment, a first connection plane 312 is provided on the inner side of the pole base 31, and a second connection plane 3221 is provided on the pole connecting portion 322. When welding the pole connecting portion 322 to the pole base 31, the pole connecting portion 322 is first aligned with a portion of the pole base 31 away from the edge, so that the second connection plane 3221 on the pole connecting portion 322 is on the same horizontal plane as the first connection plane 312 on the inner side of the pole base 31. The overlapping edge line of the second connection plane 3221 and the first connection plane 312 forms the aforementioned connection edge line. Then, a laser welding device is used to fuse the intersection of the second connection plane 3221 and the first connection plane 312 along the connection edge line, thereby completing the welding of the pole connecting portion 322 to the pole base 31.

[0048] The reason why the second connection plane 3221 and the first connection plane 312 are on the same horizontal plane is to make it easier for the laser welding equipment to melt the intersection of the second connection plane 3221 and the first connection plane 312 together, and to further reduce the power of the laser welding equipment required for welding, thereby reducing production costs and improving product yield, while protecting the sealing integrity of the battery cell and ensuring the safety performance of the battery cell.

[0049] In this embodiment, a groove 313 is provided on the inner side of the pole base 31, and the groove 313 is located away from the edge of the pole base 31. The first connection plane 312 is the top plane of the groove 313, and the second connection plane 3221 is the top plane of the pole connecting portion 322. When welding the pole connecting portion 322 to the pole base 31, the pole connecting portion 322 is first nested in the groove 313, so that the inner side surface of the pole connecting portion 322 is on the same horizontal plane as the top plane of the groove 313. Then, a laser welding device is used to fuse the inner side surface of the pole connecting portion 322 and the top plane of the groove 313 along the overlapping edge line of the two, thereby completing the welding of the pole connecting portion 322 to the base.

[0050] The setting of the groove 313 not only guides the position of the pole connecting part 322 and the pole base 31, thereby making the welding operation simpler, more convenient and easier to implement, but also after the welding is completed, the pole connecting part 322 and the groove 313 are nested and matched, making the welding of the pole connecting part 322 and the pole base 31 more stable, thereby enhancing the stability of the battery cell structure and ensuring the safety performance of the battery cell.

[0051] In actual implementation, the groove 313 in the present application can be an arc-shaped groove, and the pole connection part 322 is an arc-shaped structure with the same outer contour as the arc-shaped groove, that is, the overlapping edge line of the inner side surface of the pole connection part 322 and the top plane of the groove 313 is an arc-shaped edge line, and the laser welding equipment melts the intersection of the inner side surface of the pole connection part 322 and the top plane of the groove 313 along the arc-shaped edge line to complete the welding of the pole connection part 322 and the base; the groove 313 in the present application can also be a groove of other forms, and the pole connection part 322 has a structure with the same outer contour as other forms of grooves.

[0052] When the pole connecting portion 322 is welded and fixed to the pole base 31, the pole base 31 located on the inner side of the battery cell top cover 2 is facing upward, and the pole connecting portion 322 is embedded in the groove 313 of the pole base 31 from top to bottom. At this time, the top plane of the groove 313, that is, the first connecting plane 312, is the upper surface of the pole base 31, and the top plane of the pole connecting portion 322, that is, the second connecting plane 3221, is the upper surface of the pole connecting portion 322.

[0053] In this embodiment, the depth of the groove 313 is set to be equal to the thickness of the pole connecting portion 322, so that when the pole connecting portion 322 is nested in the groove 313, the inner side surface of the pole connecting portion 322 is exactly on the same horizontal plane as the top plane of the groove 313, thereby making the welding operation simpler, more convenient and easier to implement, and making the welding between the pole connecting portion 322 and the pole base 31 more stable, further enhancing the stability of the battery cell structure and ensuring the safety performance of the battery cell.

[0054] In this embodiment, an overcurrent column 314 is provided in the groove 313, and an overcurrent hole 3222 is provided on the pole connecting portion 322. When the pole connecting portion 322 is nested in the groove 313, the overcurrent column 314 is inserted into the overcurrent hole 3222. When the pole connecting portion 322 is welded to the pole base 31 by laser welding equipment, the intersection of the inner side surface of the pole connecting portion 322 and the top plane of the groove 313 is melted together along the overlapping edge line of the inner side surface of the pole connecting portion 322 and the top plane of the groove 313. At the same time, the intersection of the overcurrent column 314 and the overcurrent hole 3222 is melted together along the edge line of the overcurrent hole 3222, thereby making the welding between the pole connecting portion 322 and the pole base 31 more stable, further enhancing the stability of the battery cell structure, and ensuring the safety performance of the battery cell.

[0055] In addition, since the overcurrent column 314 and the pole base 31 are an integrated structure, the contact area between the pole base 31 and the pole connecting part 322 can be increased by inserting the overcurrent column 314 into the overcurrent hole 3222 on the pole connecting part 322, thereby increasing the overcurrent capacity of the battery cell tab transfer structure 3, and then making the conductivity between the tab and the pole 311 stronger, thereby ensuring the charging and discharging performance of the battery cell.

[0056] In this embodiment, a cell top cover 2 is also provided, comprising the cell tab adapter structure 3 described above, a cover body 21, and a lower plastic 22. The cell tab adapter structure 3 is fixedly mounted on the cover body 21, and the lower plastic 22 is disposed between the cell tab adapter structure 3 and the cover body 21. The lower plastic 22 insulates the cell tab adapter structure, preventing the cover body 21 from becoming electrically charged, thereby facilitating normal use of the cell.

[0057] In this embodiment, through holes are provided on the cover body 21 and the lower plastic 22. When the battery cell tab adapter structure 3 is installed on the cover body 21, the pole 311 on the pole base 31 passes through the through holes on the lower plastic 22 and the cover body 21 from the inside in sequence, and then extends to the outside of the cover body 21.

[0058] In the present application, the battery cell top cover 2 also includes a sealing ring 23, which is arranged between the pole 311 and the through hole of the cover body 21. The pole 311 is separated from the cover body 21 by the sealing ring 23. On the one hand, the pole 311 is insulated to further prevent the cover body 21 from being charged; on the other hand, the sealing ring 23 seals the gap between the pole 311 and the through hole on the cover body 21, thereby enhancing the sealing of the battery cell and ensuring the safety performance of the battery cell.

[0059] In the present application, the lower plastic 22 can be made of plastic material, so that by arranging the lower plastic 22 between the battery cell transfer structure and the cover body 21, the lower plastic 22 can insulate the battery cell transfer structure and prevent the cover body 21 from being charged; the sealing ring 23 can be made of rubber material, so that by arranging the sealing ring 23 between the pole 311 and the through hole of the cover body 21, the sealing ring 23 can insulate the pole 311, further preventing the cover body 21 from being charged, and can also seal the gap between the pole 311 and the through hole on the cover body 21.

[0060] It can be foreseen that: as mentioned in the above embodiment, preventing the laser welding equipment from damaging the plastic parts near the pole base 31 during welding is to prevent the high temperature generated by the laser welding equipment from damaging the lower plastic 22 and the sealing ring 23 during welding, thereby protecting the sealing integrity of the battery cell and ensuring the safety performance of the battery cell.

[0061] In this embodiment, the cell top cover 2 further includes a welding ring 24. When the cell tab adapter structure 3 is mounted on the cover body 21, the pole 311 on the pole base 31 passes through the lower plastic 22 and the through-holes on the cover body 21 from the inside, and then extends outside the cover body 21. The welding ring 24 is sleeved over the end of the pole 311 extending outside the cover body 21. By welding the welding ring 24 to the cover body 21 and the pole 311, the pole 311 is fixed to the cover body 21, thereby achieving the fixation of the cell tab adapter structure 3 to the cover body 21.

[0062] In this embodiment, a limiting groove 241 is provided within the welding ring 24. When the sealing ring 23 is sleeved over the outer side of the terminal post 311, one end of the sealing ring 23 extends within the through-hole of the cover plate body 21, and the other end extends outside the through-hole of the cover plate body 21. When the welding ring 24 is sleeved over the end of the terminal post 311 extending outside the cover plate body 21, the end of the sealing ring 23 extending outside the through-hole of the cover plate body 21 is inserted into the limiting groove 241. The cooperation between the sealing ring 23 and the limiting groove 241 further enhances the sealing of the battery cell, ensures the safety performance of the battery cell, and enhances the stability of the battery cell structure.

[0063] In this embodiment, a battery cell is also provided, comprising the battery cell top cover 2 described above, and also comprising a shell 1 and a bare battery cell. When assembling the battery cell, the pole base 31 is first installed on the cover body 21, and is welded to the cover body 21 and the pole 311 on the outside of the cover body 21 through the welding ring 24, thereby fixing the pole base 31 on the cover body 21; then, the tab of the bare battery cell is fixedly connected to the tab connection portion 321, and then, on the inside of the cover body 21, the pole connection portion 322 is welded to the pole base 31, and conduction between the pole 311 and the bare battery cell tab is achieved through the pole base 31 and the adapter 32.

[0064] Then, the bare battery cell is inserted into the shell 1 from the top opening of the shell 1, and finally the cover body 21 is fixedly connected to the shell 1 so that the cover body 21 closes the top opening of the shell 1, thereby encapsulating the bare battery cell in the shell 1, and electrically connecting the end of the pole 311 extending outside the cover body 21 to the external equipment to realize the charging and discharging function of the battery cell.

[0065] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the scope of protection of the present invention.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0067] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery cell tab transfer structure, characterized by: The invention comprises a pole base (31) on which a pole (311) is fixedly provided, and an adapter plate (32) for connecting a pole ear, wherein the pole base (31) is fixedly connected to the adapter plate (32); the adapter plate (32) comprises a pole ear connecting portion (321) fixedly connected to the pole ear, and a pole connecting portion (322) fixedly connected to the pole base (31); the cross-sectional area of ​​the pole base (31) is larger than the cross-sectional area of ​​the pole connecting portion (322); the pole (311) extends outside the pole base (31); the overlapping projection edge line of the pole connecting portion (322) and the pole base (31) forms a connecting edge line between the two, and the connecting edge line is away from the edge of the pole base (31).

2. A battery cell tab transfer structure as claimed in claim 1, characterized in that: A first connection plane (312) is provided on the inner side of the pole base (31), and a second connection plane (3221) is provided on the pole connection portion (322), the first connection plane (312) and the second connection plane (3221) are on the same horizontal plane, and the overlapping edge line of the second connection plane (3221) and the first connection plane (312) forms the connection edge line.

3. A battery cell tab transfer structure as claimed in claim 2, characterized in that: A groove (313) is provided on the inner side of the pole base (31), the pole connecting portion (322) is nested with the groove (313), the first connecting plane (312) is the top plane of the groove (313), and the second connecting plane (3221) is the top plane of the pole connecting portion (322).

4. A battery cell tab transfer structure as claimed in claim 3, characterized in that: The depth of the groove (313) is equal to the thickness of the pole connecting portion (322), and the thickness of the pole base (31) is equal to the thickness of the pole lug connecting portion (321).

5. The battery cell tab transfer structure as claimed in claim 3, characterized in that: A flow column (314) is provided in the groove (313), a flow hole (3222) is provided on the pole connecting portion (322), and the flow column (314) is plugged into the flow hole (3222).

6. A battery cell top cover, characterized in that: It comprises a cell tab transfer structure as described in any one of claims 1 to 5, and also comprises a cover body (21) and a lower plastic (22), wherein the cell tab transfer structure is fixedly mounted on the cover body (21), and the lower plastic (22) is arranged between the cell tab transfer structure and the top cover body to insulate the cell tab transfer structure.

7. A battery cell top cover as claimed in claim 6, characterized in that: The cover plate body (21) and the lower plastic (22) are provided with a through hole for the pole (311) to pass through, and the battery cell top cover also includes a sealing ring (23) provided between the pole (311) and the through hole, and the sealing ring (23) is used to seal the gap between the pole (311) and the through hole.

8. A battery cell top cover as claimed in claim 7, characterized in that: The cell top cover further comprises a welding ring (24) sleeved on the outside of the pole (311); the welding ring (24) is fixedly connected to the cover plate body (21) and is used to fix the pole (311) on the cover plate body (21).

9. A battery cell top cover as claimed in claim 8, characterized in that: A limiting groove (241) is provided in the welding ring (24), one end of the sealing ring (23) extends in the through hole and the other end extends outside the through hole, and the end of the sealing ring (23) extending outside the through hole is plugged into the limiting groove (241).

10. A battery cell, characterized in that: The battery cell top cover comprises the battery cell top cover according to any one of claims 6 to 9, further comprising a shell (1), and a bare battery cell arranged in the shell (1), wherein the cover plate body (21) seals the shell (1), and the tab of the bare battery cell is fixedly connected to the tab connection portion (321).

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