Electric connector, battery monomer, battery pack and electric equipment

Abstract

The utility model discloses an electric connector, a battery monomer, a battery pack and electric equipment. The electric connecting piece comprises a connecting part and a clamping part. And the connecting part is used for being connected with a pole of the battery monomer. And the clamping part is connected with the connecting part. And the clamping parts can be used for clamping tabs of the single batteries. Therefore, according to the embodiment of the invention, the electrode lug is clamped by the clamping part, so that the connection of the electric connecting piece and the electrode lug is compounded on one connecting process, the ultrasonic pre-welding on the electrode lug is not needed, the connecting process can be simplified, the connecting process is relatively simple, and the welding efficiency is relatively good.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to an electrical connector, a battery cell, a battery pack, and an electrical device. Background Art

[0002] In the related art, the connection piece of the battery cover plate is often connected to the battery tab by a combination of ultrasonic pre-welding + laser welding. That is, the battery tab needs to be ultrasonically pre-welded first, then cut, and finally the cut battery tab is laser welded to the electrical connector of the battery cover plate to realize the connection between the connection piece of the battery cover plate and the battery tab. The connection process is relatively complex and the welding efficiency is poor. Summary of the Utility Model

[0003] In view of this, the present utility model aims to solve at least one of the problems in the related art to some extent. For this reason, the purpose of the present utility model is to provide an electrical connector, a battery cell, a battery pack, and an electrical device.

[0004] The present application provides an electrical connector for a battery cell. The electrical connector includes a connection portion and a clamping portion. The connection portion is used to connect to the pole column of the battery cell. The clamping portion is connected to the connection portion. The clamping portion can clamp the tab of the battery cell.

[0005] In some embodiments, the clamping portion includes two clip pieces arranged oppositely, and the two clip pieces jointly clamp the tab of the battery cell.

[0006] In some embodiments, the two clip pieces are respectively a first clip piece and a second clip piece. The first clip piece includes a first sub-clip piece and a second sub-clip piece. The second clip piece includes a third sub-clip piece and a fourth sub-clip piece. The first sub-clip piece and the third sub-clip piece are arranged oppositely on one side of the connection portion. The second sub-clip piece and the fourth sub-clip piece are arranged oppositely on the other side of the connection portion. The first sub-clip piece, the third sub-clip piece, the second sub-clip piece, and the fourth sub-clip piece jointly clamp the tab of the battery cell.

[0007] In some embodiments, the first sub-clip piece is arranged closer to the end cover of the battery cell than the third sub-clip piece, and the second sub-clip piece is arranged closer to the end cover of the battery cell than the fourth sub-clip piece. A protrusion is provided on the side of the first sub-clip piece and the second sub-clip piece and / or the third sub-clip piece and the fourth sub-clip piece facing the tab of the battery cell. The protrusion is used to abut against the tab of the battery cell.

[0008] In some embodiments, the third sub-clip piece can rotate relative to the first sub-clip piece, and the fourth sub-clip piece can rotate relative to the second sub-clip piece.

[0009] In some embodiments, the protrusions are arranged linearly.

[0010] In some embodiments, the height range of the protrusions is 0.5 mm to 10 mm.

[0011] In some embodiments, the sum of the projected areas of all the protrusions provided on one side of the first sub-clamping piece and the second sub-clamping piece and / or the third sub-clamping piece and the fourth sub-clamping piece facing the tab of the battery cell projected on the tab of the battery cell is greater than or equal to a predetermined over-current area.

[0012] In some embodiments, a ring-shaped protrusion is formed at one end of the connecting portion facing the pole column of the battery cell, and the connecting portion abuts against the pole column of the battery cell through the ring-shaped protrusion.

[0013] This application provides a battery cell. The battery cell includes an end cap, an electrode assembly provided on one side of the end cap, a pole column provided on the end cap, and an electrical connector as described in any of the above embodiments connected to the pole column. The electrode assembly includes a plurality of stacked tabs. The electrical connector clamps the tabs.

[0014] In some embodiments, the electrical connector includes a connecting portion and a clamping portion connected to the connecting portion, the connecting portion

[0015] In some embodiments, the battery cell further includes a terminal. One end of the pole column is connected to the electrical connector, and the other end of the pole column is connected to the terminal and passes through the end cap.

[0016] In some embodiments, the battery cell further includes a seal. The seal is sleeved on the pole column and is located between the end cap and the pole column.

[0017] In some embodiments, the battery cell further includes a first insulating member, and the first insulating member is provided between the electrical connector and the end cap.

[0018] In some embodiments, the clamping portion of the electrical connector is resistance welded to the tab.

[0019] In some embodiments, the battery cell further includes a second insulating member, and the second insulating member is sleeved on the terminal and is located between the terminal and the end cap.

[0020] This application further provides a battery pack. The battery pack includes a plurality of battery cells as described in any of the above embodiments.

[0021] The present application also provides an electrical device. The electrical device includes the battery pack described in any of the above embodiments, or includes the battery cell described in any of the above embodiments.

[0022] In the electrical connection member, battery cell, battery pack and electrical device according to the embodiments of the present application, the tab is clamped by the clamping portion, so that the connection between the electrical connection member and the tab is combined in one connection process, and ultrasonic pre-welding of the tab is not required, which can simplify the connection process, make the connection process relatively simple, and have good welding efficiency.

[0023] Some of the additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0025] Figure 1 is an axonometric view of a battery cell according to an embodiment of the present application;

[0026] Figure 2 is an axonometric view of a battery cell without a tab placed on the electrical connection member according to an embodiment of the present application;

[0027] Figure 3 is an axonometric view of a battery cell with a tab placed on the electrical connection member according to an embodiment of the present application;

[0028] Figure 4 is a structural diagram of an electrical connection member according to an embodiment of the present application;

[0029] Figure 5 is a structural diagram of the assembly of the electrical connection member and the pole column according to an embodiment of the present application;

[0030] Figure 6 is an exploded view of a battery cell according to an embodiment of the present application;

[0031] Figure 7 is a structural diagram of a battery cell according to an embodiment of the present application;

[0032] Figure 8 is Figure 7 a cross-sectional view of the battery cell;

[0033] Figure 9 is a structural diagram of an adapter according to an embodiment of the present application.

[0034] Main reference numerals of the main elements:

[0035] Battery cell 100;

[0036] End cover 10; electrode assembly 20, tab 21; terminal 30, first sub-terminal 31, second sub-terminal 33; electrical connector 40; connecting portion 41; clamping portion 43; clip 431; first clip 433, first sub-clip 4331, second sub-clip 4333; second clip 435, third sub-clip 4351, fourth sub-clip 4353, protrusion 437; annular protrusion 45; terminal 50; seal 60; second insulating member 70; first insulating member 80; explosion-proof valve 90; protection sheet 110. Detailed implementation manners

[0037] The following describes in detail the implementation manners of the present utility model. Examples of the implementation manners are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as a limitation of the present utility model.

[0038] In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. It may refer to a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] The following disclosure provides many different implementation manners or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various implementation manners and / or settings discussed.

[0041] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0042] Please refer to Figure 1 and Figure 2 , the present application provides an electrical connector 40 for a battery cell 100. The electrical connector 40 includes a connecting portion 41 and a clamping portion 43. The connecting portion 41 is used to connect with the terminal 30 of the battery cell 100. The clamping portion 43 is connected to the connecting portion 41. The clamping portion 43 can clamp the tab 21 of the battery cell 100.

[0043] Specifically, as Figure 2 shown, the clamping portions 43 can be respectively arranged at both ends of the connecting portion 41 by an integral molding method to reduce the production cost. One end of the connecting portion 41 can be connected to the terminal 30 by a snap-fit method to facilitate the installation and disassembly of the electrical connector 40.

[0044] When the tab 21 needs to be assembled, as Figure 3 shown, the tab 21 of the battery cell 100 can be first placed on the clamping portion 43, and then the clamping portion 43 is changed from the unfolded state as Figure 3 shown to the folded state as Figure 1 shown, so that the clamping portion 43 clamps the tab 21 of the battery cell 100, facilitating subsequent connection of the electrical connector 40 to the tab 21 of the battery cell 100 by resistance welding or pressure fusion welding. The processes of ultrasonic pre-welding the tab 21 of the battery cell 100 and cutting the tab 21 of the battery cell 100 before assembly can be omitted, enabling the connection of the tab 21, the terminal 30, and the electrical connector 40 of the battery cell 100 to be completed in the same process, simplifying the connection process and having good welding efficiency.

[0045] In this way, the electrical connector 40 in the embodiment of the present application clamps the tab 21 through the clamping portion 43, enabling the connection between the electrical connector 40 and the tab 21 to be combined in one connection process, eliminating the need for ultrasonic pre-welding of the tab 21, simplifying the connection process, making the connection process relatively simple, and having good welding efficiency.

[0046] Please refer to Figures 1 to 3, in some embodiments, the clamping portion 43 includes two relatively arranged clamping pieces 431. The two clamping pieces 431 jointly clamp the tab 21 of the battery cell 100. That is, when the tab 21 needs to be assembled, the embodiments of the present application can cooperate with two relatively arranged clamping pieces 431 to jointly clamp the tab 21, so that the processes of ultrasonic pre-welding and cutting the tab 21 before assembling the tab 21 can be omitted, and the connection between the tab 21 and the electrical connector 40 can be completed in the same process, simplifying the connection process, with better welding efficiency. And since the electrical connector 40 in the embodiments of the present application is a deployable and foldable structure, compared with the connection piece of the battery cover plate in the related art, the assembly of the tab 21 and the electrical connection piece is simpler, and the tolerance rate of the assembly position dimension is higher.

[0047] In some embodiments, the two clamping pieces 431 are respectively a first clamping piece 433 and a second clamping piece 435. The first clamping piece 433 includes a first sub-clamping piece 4331 and a second sub-clamping piece 43333. The second clamping piece 435 includes a third sub-clamping piece 4351 and a fourth sub-clamping piece 4353. The first sub-clamping piece 4331 and the third sub-clamping piece 4351 are relatively arranged on one side of the connecting portion 41, and the second sub-clamping piece 4333 and the fourth sub-clamping piece 4353 are relatively arranged on the other side of the connecting portion 41. The first sub-clamping piece 4331, the third sub-clamping piece 4351, the second sub-clamping piece 4333 and the fourth sub-clamping piece 4353 jointly clamp the tab 21 of the battery cell 100.

[0048] Specifically, the first sub-clamping piece 4331 and the third sub-clamping piece 4351 can be relatively arranged on one side of the connecting portion 41 by screwing or clamping, and the second sub-clamping piece 4333 and the fourth sub-clamping piece 4353 can also be relatively arranged on the other side of the connecting portion 41 by screwing or clamping. The first sub-clamping piece 4331 and the second sub-clamping piece 4333 can form the first clamping piece 433, and the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 can form the second clamping piece 435.

[0049] When the tab 21 of the battery cell 100 needs to be assembled, the tab 21 can be placed between the two groups of clamping pieces, so that the first sub-clamping piece 4331, the third sub-clamping piece 4351, the second sub-clamping piece 4333 and the fourth sub-clamping piece 4353 cooperate with each other to jointly clamp the tab 21 of the battery cell 100, so that the processes of ultrasonic pre-welding and cutting the tab 21 before assembling the tab 21 can be omitted, and the connection between the tab 21, the pole column 30 and the electrical connector 40 can be completed in the same process, simplifying the connection process, with better welding efficiency. And since the electrical connector 40 in the embodiments of the present application is a deployable and foldable structure, compared with the connection piece of the battery cover plate in the related art, the assembly of the tab 21 and the electrical connection piece is simpler, and the tolerance rate of the assembly position dimension is higher.

[0050] In addition, in the embodiment of the present application, by clamping the tab 21 between the first clamping piece 433 and the second clamping piece 435, the tab 21 of the battery cell 100 can act on the electrical connector 40, reducing the risk of breaking the first-layer tab 21 during subsequent resistance welding or pressure fusion welding.

[0051] Please refer to Figures 2 to 4 , in some embodiments, the first sub-clamping piece 4331 is disposed closer to the end cap 10 of the battery cell 100 than the third sub-clamping piece 4351, and the second sub-clamping piece 4333 is disposed closer to the end cap 10 of the battery cell 100 than the fourth sub-clamping piece 4353. A protrusion 437 is provided on one side of the first sub-clamping piece 4331 and the second sub-clamping piece 4333 and / or the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 facing the tab 21 of the battery cell 100, and the protrusion 437 is used to abut against the tab 21 of the battery cell 100.

[0052] Specifically, when the first sub-clamping piece 4331 is disposed on one side of the connecting portion 41, it can be disposed closer to the end cap 10 than the third sub-clamping piece 4351, and when the second sub-clamping piece 4333 is disposed on the other side of the connecting portion 41, it can be disposed closer to the end cap 10 than the fourth sub-clamping piece 4353. The third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 can include an unfolded state as shown in Figure 2 and a folded state as shown in Figure 1 so that the electrical connector 40 can be in a butterfly shape, thereby reducing spatter during the connection process of the electrical connector 40 and the tab 21 by resistance welding or pressure fusion welding and improving the connection strength.

[0053] The protrusion 437 provided on one side of the first sub-clamping piece 4331 and the second sub-clamping piece 4333 and / or the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 facing the tab 21 of the battery cell 100 can include the following three cases: (1) protrusions 437 are provided on one side of the first sub-clamping piece 4331 and the second sub-clamping piece 4333 facing the tab 21; (2) protrusions 437 are provided on one side of the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 facing the tab 21. (3) protrusions 437 are provided on one side of the first sub-clamping piece 4331 and the second sub-clamping piece 4333 and the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 facing the tab 21.

[0054] In one embodiment, as shown in Figure 4 , the protrusion 437 can be provided on the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353. When the tab 21 needs to be assembled, as shown in Figure 3 , the tab 21 can be first placed on the first sub-clamping piece 4331 and the second sub-clamping piece 4333, and then the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 are changed from the unfolded state as shown in Figure 3 to the folded state as shown in Figure 1In the folded state, while the first sub-clamping piece 4331, the third sub-clamping piece 4351, the second sub-clamping piece 4333, and the fourth sub-clamping piece 4353 jointly clamp the tab 21, the protrusion 437 abuts against the tab 21. When the tab 21 and the electrical connector 40 can be welded by resistance welding or pressure fusion welding, the unit area pressure and current density can be increased through the protrusion 437, so as to utilize the resistance heat generated by the current passing through the welding contact surface, and at the same time apply pressure to locally heat the electrical connector 40 and the tab 21 to the melting or plastic state to form a solder joint, realizing the welding of the tab 21 and the electrical connector 40, reducing the current shunt effect and spatter, and improving the welding efficiency.

[0055] It should be noted that the protrusion 437 provided on the side of the clamping piece 431 facing the tab 21 can be integrally formed to reduce the production cost. The number and size of the protrusions 437 provided on the side of the clamping piece 431 facing the tab 21 can be set according to the current-carrying area requirement of the tab 21, and no limitation is made here. The number of the protrusions 437 provided on the side of the clamping piece 431 facing the tab 21 can be, for example, 1, 2, 3, 4, 5, 6, 7, or 8, and no limitation is made here. The cross-section of the protrusion 437 can be spherical, hemispherical, cylindrical, conical, polygonal, etc., and no limitation is made here.

[0056] In addition, the number of the pole columns 30 can be one or more. When the number of the pole columns 30 is multiple, for example, it can be two. That is, when there are two pole columns 30, one pole column 30 can be correspondingly arranged with the third sub-clamping piece 4351 provided at one end of the connecting portion 41, and the other pole column 30 can be correspondingly arranged with the fourth sub-clamping piece 4353 provided at the other end of the connecting portion 41.

[0057] In some embodiments, the third sub-clamping piece 4351 can rotate relative to the first sub-clamping piece 4331. The fourth sub-clamping piece 4353 can rotate relative to the second sub-clamping piece 4333. That is, when the tab 21 needs to be assembled, the embodiment of the present application can place the tab 21 on the first sub-clamping piece 4331 and the second sub-clamping piece 4333, and by rotating the third sub-clamping piece 4351 relative to the first sub-clamping piece 4331 and the fourth sub-clamping piece 4353 relative to the second sub-clamping piece 4333, the third sub-clamping piece 4351 and the fourth sub-clamping piece 4353 are changed from the unfolded state to the folded state, so that the first sub-clamping piece 4331, the third sub-clamping piece 4351, the second sub-clamping piece 4333, and the fourth sub-clamping piece 4353 jointly clamp the tab 21, facilitating the connection between the tab 21 and the electrical connector 40.

[0058] In some embodiments, the protrusions 437 are arranged linearly. That is, in one embodiment, the protrusions 437 provided on the clip 431 may be linearly arranged at equal or unequal intervals. In another embodiment, the protrusions 437 provided on the clip 431 may be arranged in any shape such as a circular arrangement or an annular arrangement. That is, the user can select the specific arrangement of the protrusions 437 according to the actual application situation, which is not limited herein. It should be noted that the distance between any two protrusions can be any value in the range of 1 cm to 30 cm, which is not limited herein.

[0059] Please refer to Figure 4 , in some embodiments, the height range of the protrusions 437 is 0.5 mm to 10 mm. That is, the height H of the protrusions 437 provided on the clip 431 can be any value in the range of 0.5 mm to 10 mm, which is not limited herein.

[0060] In some embodiments, the sum of the projected areas of all the protrusions 437 provided on the side of the clip 431 facing the tab 21 of the battery cell 100 projected onto the tab 21 of the battery cell 100 is greater than or equal to a predetermined overcurrent area. It should be noted that the predetermined overcurrent area may refer to the overcurrent area required for the connection between the tab 21 of the battery cell 100 and the clamping portion 43. The overcurrent area required for the connection between the tab 21 of the battery cell 100 and the clamping portion 43 can be any value in the range of 10 mm 2 -300 mm 2 and is not limited herein.

[0061] Please refer to Figures 4 to 6 , in some embodiments, a ring-shaped protrusion 45 is formed at one end of the connecting portion 41 facing the pole column 30 of the battery cell 100, and the connecting portion 41 abuts against the pole column 30 of the battery cell 100 through the ring-shaped protrusion 45.

[0062] Specifically, in one embodiment, as Figure 4 shown, the ring-shaped protrusion 45 can be provided on the side of the connecting portion 41 facing the pole column 30 of the battery cell 100. When the electrical connector 40 is assembled with the pole column 30 of the battery cell 100, the ring-shaped protrusion 45 can abut against the pole column 30 of the battery cell 100. When the electrical connector 40 and the pole column 30 of the battery cell 100 are welded by resistance welding or pressure fusion welding, the unit area pressure and current density can be increased through the ring-shaped protrusion 45, so that the connecting portion 41 and the pole column 30 of the battery cell 100 can be locally heated to the melting or plastic state to form a solder joint by using the resistance heat generated when the current passes through the welding contact surface and applying pressure at the same time, realizing the welding of the electrical connector 40 and the pole column 30 of the battery cell 100 and improving the welding efficiency. It should be noted that the ring-shaped protrusion 45 and the connecting portion 41 can be integrally formed to reduce the production cost.

[0063] In another embodiment, the annular protrusion 45 may be provided on the side of the pole column 30 of the battery cell 100 facing the adapter 50. When the electrical connector 40 is assembled with the pole column 30 of the battery cell 100, the annular protrusion 45 can be abutted against the connecting portion 41, so that when the electrical connector 40 and the pole column 30 of the battery cell 100 are welded by resistance welding or pressure fusion welding, the unit area pressure and current density can be increased through the annular protrusion 45, thereby utilizing the resistance heat generated by the current passing through the welding contact surface and applying pressure at the same time to locally heat the connecting portion 41 and the pole column 30 of the battery cell 100 to a molten or plastic state to form a solder joint, realizing the welding of the electrical connector 40 and the pole column 30 of the battery cell 100 and improving the welding efficiency. It should be noted that the annular protrusion 45 and the pole column 30 of the battery cell 100 can be integrally formed to reduce the production cost.

[0064] In addition, the annular protrusion 45 may not be provided between the connecting portion 41 and the pole column 30 of the battery cell 100, and the connecting portion 41 and the pole column 30 of the battery cell 100 can be connected by laser welding.

[0065] Please refer to Figures 1 to 3 、 Figure 6 and Figure 7 , the present application provides a battery cell 100. The battery cell 100 includes an end cap 10, an electrode assembly 20 provided on one side of the end cap 10, a pole column 30 provided on the end cap 10, and the electrical connector 40 described above connected to the pole column 30. The electrode assembly 20 includes a plurality of stacked tab ears 21. The electrical connector 40 clamps the tab ears 21.

[0066] Specifically, the electrode assembly 20 and the electrical connector 40 can be provided on one side of the end cap 10, and the pole column 30 can be provided on the other side of the end cap 10. The electrical connector 40 can be connected to the pole column 30 by clamping or welding. The electrode assembly 20 can include a plurality of stacked tab ears 21. The electrical connector 40 can clamp the tab ears 21 and be connected to the tab ears 21 by resistance welding or pressure fusion welding, so that the connection of the end cap 10, the electrical connector 40 and the tab ears 21 can be welded at the same station, and ultrasonic pre-welding of the tab ears 21 is not required in advance, which can simplify the connection process and improve the welding efficiency and the battery transfer efficiency.

[0067] It should be noted that the end cap 10 can be made of metal or plastic. That is, when the end cap 10 is made of plastic, the production cost can be reduced. When the end cap 10 is made of metal, the service life of the end cap 10 can be extended. The electrical connector 40 can be made of metal so that the electrical connector 40 has electrical conductivity.

[0068] Thus, the battery cell 100 according to the embodiment of the present application clamps the tab 21 through the clamping portion 43 and is connected to the terminal post 30 through the connecting portion 41, so that the connection of the end cap 10, the terminal post 30, the electrical connector 40 and the tab 21 is combined in one connection process. There is no need to perform ultrasonic pre-welding on the tab 21, which can simplify the connection process, make the connection process relatively simple, and have good welding efficiency.

[0069] It can be understood that since the embodiment of the present application can clamp the tab 21 through the electrical connector 40 connected to the terminal post 30, so that the connection of the end cap 10, the electrical connector 40 and the tab 21 is realized on the same station. Therefore, in the embodiment of the present application, there is no need to be equipped with multiple welding devices, which can save the site occupied by the welding devices, and the production cost is relatively low. And since the connection method adopted in the present application is resistance welding or pressure fusion welding, the processes of ultrasonic pre-welding the tab 21 in advance and cutting the tab 21 can be omitted, so that the connection of the tab 21, the terminal post 30 and the electrical connector 40 can be completed in the same process. While simplifying the connection process, there is no need to introduce a shielding gas during welding like laser welding, which can further save the production cost.

[0070] Please refer to Figure 6 and Figure 8 , in some embodiments, the battery cell 100 further includes a terminal 50. One end of the terminal post 30 is connected to the electrical connector 40, and the other end of the terminal post 30 is connected to the terminal 50 and penetrates through the end cap 10.

[0071] That is to say, when assembling the battery cell 100, the terminal post 30 can penetrate through the end cap 10. One end of the terminal post 30 can be connected to the electrical connector 40 by laser welding, resistance welding or pressure fusion welding, and the other end of the terminal post 30 can be connected to the terminal 50 by welding, so that when the electrical device needs power, it can be electrically connected to the battery cell 100 through the terminal 50.

[0072] It should be noted that when the tab 21 is the positive electrode, the terminal post 30 can be made of aluminum. When the tab 21 is the negative electrode, as Figure 8 shown, the terminal post 30 can be welded by the first sub-terminal post 31 and the second sub-terminal post 33. The first sub-terminal post 31 and the second sub-terminal post 33 can be made of different metal materials, that is, the first sub-terminal post 31 can be made of copper, and the second sub-terminal post 33 can be made of aluminum.

[0073] Please refer to Figure 1 and Figure 6, in some embodiments, the battery cell 100 further includes a seal 60. The seal 60 is sleeved on the pole post 30 and is located between the end cap 10 and the pole post 30. That is, in the embodiments of the present application, by sleeving the seal 60 on the pole post 30 and locating it between the end cap 10 and the pole post 30, a sealing effect can be achieved, thereby preventing external contaminants from polluting the interior of the end cap 10 and the pole post 30. It should be noted that the seal 60 can be made of plastic or rubber to reduce production costs.

[0074] In some embodiments, the battery cell 100 further includes a first insulating member 80. The first insulating member 80 is disposed between the electrical connector 40 and the end cap 10. That is, in the embodiments of the present application, by disposing the first insulating member 80 between the electrical connector 40 and the end cap 10, it is possible to prevent the electrical connector 40 from coming into direct contact with the end cap 10, which may cause a short circuit of the battery cell 100. It should be noted that the first insulating member 80 can be made of a non-conductive material such as plastic or rubber, and is not limited herein.

[0075] In some embodiments, the clamping portion 43 of the electrical connector 40 is resistance welded to the tab 21. That is, in the embodiments of the present application, the clamping portion 43 of the electrical connector 40 clamps the tab 21, and the tab 21 is connected to the clamping portion 43 of the electrical connector 40 by resistance welding, so that the connection of the pole post 30, the electrical connector 40, and the tab 21 can be welded at the same station, and it is not necessary to perform ultrasonic pre-welding on the tab 21 in advance, which can simplify the connection process and improve the welding efficiency and the battery transfer efficiency.

[0076] In some embodiments, the battery cell 100 further includes a second insulating member 70. The second insulating member 70 is sleeved on the terminal 50 and is located between the terminal 50 and the end cap 10. That is, in the embodiments of the present application, by sleeving the second insulating member 70 on the terminal 50 and locating it between the terminal 50 and the end cap 10, it is possible to prevent the terminal 50 from coming into direct contact with the end cap 10, which may cause a short circuit of the battery cell 100. It should be noted that the second insulating member 70 can be made of a non-conductive material such as plastic or rubber, and is not limited herein.

[0077] It can be understood that since the electrical connector 40 in the embodiments of the present application is thinner and lighter in weight than the connecting piece of the battery cover plate in the related art, accordingly, the thickness and weight of the second insulating member 70 disposed between the terminal 50 and the end cap 10 can be reduced, thereby improving the space utilization rate inside the battery cell 100.

[0078] Please refer back to Figure 1 and Figure 6, in some embodiments, the battery cell 100 further includes an explosion-proof valve 90. The explosion-proof valve 90 is disposed on the end cap 10. That is, the explosion-proof valve 90 can be disposed on the end cap 10 by welding or screwing. When the pressure inside the battery cell 100 is too high, the explosion-proof valve 90 can be used to release the pressure, preventing the battery cell 100 from exploding due to excessive internal pressure.

[0079] In some embodiments, the battery cell 100 further includes a protection sheet 110. The protection sheet 110 covers the explosion-proof valve 90. That is, in the embodiment of the present application, by covering the explosion-proof valve 90 with the protection sheet 110, while protecting the explosion-proof valve 90, it can prevent external contaminants from polluting the explosion-proof valve 90.

[0080] In summary, the connection and assembly steps of the end cap 10, the tab 21, the terminal 30, and the electrical connector 40 are specifically as follows:

[0081] (1) The explosion-proof valve 90 is disposed on the end cap 10 by welding.

[0082] (2) The electrical connector 40 is connected to the terminal 30 by resistance welding or pressure fusion welding.

[0083] (3) As shown in Figure 6 , the terminal 50, the second insulating member 70, the end cap 10, the sealing member 60, the first insulating member 80, the terminal 30, and the electrical connector 40 can be assembled into one body in sequence by riveting, and then as shown in Figure 3 , the tab 21 is lapped on the clamping portion 43 of the electrical connector 40, and then as shown in Figure 1 , the clamping portion 43 of the electrical connector 40 is folded so that the clamping portion 43 of the electrical connector 40 clamps the tab 21.

[0084] (4) The tab 21 is connected to the electrical connector 40 by resistance welding or pressure fusion welding, thereby completing the connection and assembly of the end cap 10, the tab 21, the terminal 30, and the electrical connector 40.

[0085] The present application also provides a battery pack. The battery pack includes a plurality of the battery cells 100 described above. The specific structure of the battery cell 100 is as described above. For the sake of brevity of the article, it will not be described in detail here. It should be noted that the battery cell 100 can be a blade battery or the like, and is not limited herein.

[0086] In this way, the battery pack of the embodiment of the present application clamps the tab 21 through the clamping portion 43 and is connected to the terminal 30 through the connecting portion 41, so that the connection of the end cap 10, the terminal 30, the electrical connector 40, and the tab 21 is combined in one connection process, without ultrasonic pre-welding of the tab 21, which can simplify the connection process, make the connection process relatively simple, and have good welding efficiency.

[0087] The present application further provides an electrical device. The electrical device includes the battery pack described above, or the battery cell 100 described above. The specific structures of the specific battery pack and the battery cell 100 are as described above. For the sake of brevity of the article, they will not be elaborated here. It should be noted that the electrical device can be a vehicle, a household appliance, a mobile phone, etc., and there is no limitation here.

[0088] In this way, the electrical device according to the embodiment of the present application clamps the tab 21 through the clamping portion 43 and is connected to the terminal 30 through the connecting portion 41, so that the connection of the end cap 10, the terminal 30, the electrical connector 40 and the tab 21 is combined in one connection process, and there is no need to perform ultrasonic pre-welding on the tab 21, which can simplify the connection process, make the connection process relatively simple, and have good welding efficiency.

[0089] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An electrical connector, characterized in that: For a battery cell, the electrical connector comprises: A connecting portion, the connecting portion being used to connect to a pole of the battery cell; and A clamping portion is connected to the connecting portion, and the clamping portion can clamp the tab of the battery cell.

2. The electrical connector according to claim 1, characterized in that: The clamping portion includes two clamping pieces arranged opposite to each other, and the two clamping pieces clamp the tabs of the battery cell together.

3. The electrical connector according to claim 2, characterized in that: The two clips are respectively a first clip and a second clip, the first clip includes a first sub-clip and a second sub-clip, the second clip includes a third sub-clip and a fourth sub-clip, the first sub-clip and the third sub-clip are relatively arranged on one side of the connecting portion, the second sub-clip and the fourth sub-clip are relatively arranged on the other side of the connecting portion, and the first sub-clip, the third sub-clip, the second sub-clip and the fourth sub-clip jointly clamp the tabs of the battery cell.

4. The electrical connector according to claim 3, characterized in that: The first sub-clip is arranged relative to the third sub-clip close to the end cover of the battery cell, the second sub-clip is arranged relative to the fourth sub-clip close to the end cover of the battery cell, and the first sub-clip and the second sub-clip and / or the third sub-clip and the fourth sub-clip are provided with protrusions on one side facing the pole ear of the battery cell, and the protrusions are used to abut against the pole ear of the battery cell.

5. The electrical connector according to claim 3, characterized in that: The third sub-clip is rotatable relative to the first sub-clip, and the fourth sub-clip is rotatable relative to the second sub-clip.

6. The electrical connector according to claim 4, characterized in that: The protrusions are arranged linearly.

7. The electrical connector according to claim 4, characterized in that: The height of the protrusion ranges from 0.5 mm to 10 mm.

8. The electrical connector according to claim 1, characterized in that: An annular protrusion is formed on one end of the connecting portion facing the pole of the battery cell, and the connecting portion abuts against the pole of the battery cell through the annular protrusion.

9. A battery cell, characterized in that: The battery cell comprises: End caps; An electrode assembly disposed on one side of the end cover, the electrode assembly comprising a plurality of stacked tabs; A pole disposed on the end cover; and The electrical connector according to any one of claims 1 to 8 connected to the pole, wherein the electrical connector clamps the pole lug.

10. The battery cell according to claim 9, characterized in that: The battery cell further includes a terminal, one end of the pole is connected to the electrical connector, and the other end of the pole is connected to the terminal and is passed through the end cover.

11. The battery cell according to claim 9, characterized in that: The battery cell further comprises a sealing member, which is sleeved on the pole and located between the end cover and the pole.

12. The battery cell according to claim 9, characterized in that: The battery cell further includes a first insulating member disposed between the electrical connector and the end cover.

13. The battery cell according to claim 9, characterized in that: The clamping portion of the electrical connector is connected to the tab by resistance welding.

14. The battery cell according to claim 10, characterized in that: The battery cell further includes a second insulating member, which is sleeved on the terminal and located between the terminal and the end cover.

15. A battery pack, characterized in that: The battery pack comprises the battery cell according to any one of claims 9 to 14.

16. An electrical equipment, characterized in that: The electrical equipment includes the battery pack according to claim 15, or includes the battery cell according to any one of claims 9-14.

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