Battery cell adapter plate, battery cell structure, battery pack and vehicle

Abstract

The utility model relates to a battery cell adapter piece, a battery cell structure, a battery pack and a vehicle. The battery cell adapter piece comprises an adapter piece body and at least one adapter arm, the adapter arm is connected to one side of the adapter sheet body along the first direction; the adapter sheet body is provided with a first welding area used for being welded with a battery cell pole; the adapter arm is provided with a second welding area used for being welded with a battery cell tab, and the first welding area is not connected with the second welding area; wherein the size between the gravity center of the first welding area and the gravity center of the second welding area is a first size; the projection length of the first welding area in the first direction is L1, the projection length of the first welding area in the second direction is L2, and the projection lengths of the second welding area in the first direction and the second direction are L3 and L4 respectively; the first dimension is not greater than (L1 + L2) / 2 + (L3 + L4) / 2. According to the battery cell adapter piece, the transmission path of electrons between the battery cell pole and the battery cell tab can be shortened.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery cells, and specifically, to a battery cell adapter tab, a battery cell structure, a battery pack, and a vehicle. Background Art

[0002] An adapter tab, also known as a connecting piece or a flexible connecting piece, is a key component for connecting the electrode tab of a battery cell and the electrode post of the battery cell, responsible for transmitting the current generated by the wound core. The adapter tab also provides necessary mechanical support for the battery cell to ensure the stable position of the battery cell in the battery pack. In some designs, the adapter tab can also have the function of overcurrent protection. When the current exceeds the safety threshold, the adapter tab may melt to prevent the battery from overheating or being damaged.

[0003] The current generated by the wound core is supplied to the outside through the electrode tab of the battery cell, the adapter tab, and the electrode post of the battery cell in sequence. In the related art, the transmission path of electrons in the electrode tab of the battery cell, the adapter tab, and the electrode post is too long, resulting in too large Ohmic internal resistance of the adapter tab, and further resulting in too large Ohmic internal resistance of the battery cell, high heat dissipation requirements, low power output, and reduced lifespan, etc. Summary of the Utility Model

[0004] To overcome the problems existing in the related art, the present disclosure provides a battery cell adapter tab, a battery cell structure, a battery pack, and a vehicle to solve the technical problems existing in the related art.

[0005] According to the first aspect of the embodiments of the present disclosure, a battery cell adapter tab is provided. The battery cell adapter tab includes an adapter tab body and at least one adapter arm; the adapter arm is connected to one side of the adapter tab body along a first direction; the adapter tab body is provided with a first welding area for welding with the electrode post of the battery cell; the adapter arm is provided with a second welding area for welding with the electrode tab of the battery cell, and the first welding area and the second welding area are not connected;

[0006] Wherein, the dimension between the centroid of the first welding area and the centroid of the second welding area is a first dimension;

[0007] The projection length of the first welding area in the first direction is L1, the projection length of the first welding area in a second direction is L2, the projection length of the second welding area in the first direction is L3, and the projection length of the second welding area in the second direction is L4;

[0008] The first dimension is not greater than (L1 + L2) / 2 + (L3 + L4) / 2, and the first direction and the second direction intersect.

[0009] In some embodiments, the first dimension is not greater than 0.36×(L1 + L4), or the first dimension is not greater than 0.36×(L2 + L3); or the first dimension is not greater than 0.36×(L1 + L4) and not greater than 0.36×(L2 + L3);

[0010] Or,

[0011] the first dimension is not greater than 0.36×(L1 + L2), or the first dimension is not greater than 0.36×(L3 + L4); or the first dimension is not greater than 0.36×(L1 + L2) and not greater than 0.36×(L3 + L4).

[0012] In some embodiments, the first dimension is not greater than 0.5×(L1 + L2 + L3 - L4), or the first dimension is not greater than 0.5×(L2 + L3 + L4 - L1), or the first dimension is not greater than 0.5×(L1 + L2 - L3 + L4), or the first dimension is not greater than 0.5×(L1 - L2 + L3 + L4).

[0013] In some embodiments, two transfer arms are provided. Both of the two transfer arms are connected to the same side of the transfer piece body along the first direction, and the two transfer arms are spaced apart along the second direction and jointly enclose a spacing groove with the transfer piece body;

[0014] The transfer piece body is symmetrically arranged about a first axis extending along the first direction, and the two transfer arms are symmetrically arranged about the first axis;

[0015] Wherein, the first welding area is symmetrically arranged about the first axis, and the two second welding areas of the two transfer arms are symmetrically arranged about the first axis.

[0016] In some embodiments, the projection length L2 of the first welding area in the second direction is greater than the projection length L5 of the spacing groove in the second direction.

[0017] In some embodiments, the projection of the spacing groove in the first direction is located within the projection of the first welding area in the first direction.

[0018] In some embodiments, the projection of the first welding area in the first direction and the projection of the second welding area in the first direction partially overlap.

[0019] According to a second aspect of the present disclosure, a battery cell structure is further provided. The battery cell structure includes a battery cell upper cover, a battery cell body, battery cell poles, battery cell tabs, and the battery cell transfer piece as described above;

[0020] The cell terminal is disposed on the cell upper cover, and the cell tab is disposed on the cell body;

[0021] The cell tab includes a main body plate and at least one bending portion. The bending portions are arranged in one-to-one correspondence with the transfer arms. The bending portion is bent and connected to the main body plate and defines an installation groove with the main body plate. The main body plate is connected to the cell body. The transfer arm is disposed in the installation groove, and the second welding area of the transfer arm is welded to the bending portion.

[0022] According to a third aspect of the embodiments of the present disclosure, there is also provided a battery pack, which includes the cell structure described above.

[0023] According to a fourth aspect of the embodiments of the present disclosure, there is additionally provided a vehicle, which includes the battery pack described above.

[0024] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: By providing a first welding area on the transfer piece body and a second welding area on the transfer arm, and the first welding area is welded to the cell terminal, and the second welding area is welded to the cell tab, that is, the electrical connection between the cell tab and the cell terminal is realized through the cell transfer piece. In addition, since the first welding area and the second welding area are not connected, the problem of overlapping welding can be effectively avoided. In addition, by limiting the first dimension and limiting it to be not greater than (L1 + L2) / 2 + (L3 + L4) / 2, the first welding area and the second welding area can be made to approach each other, effectively shortening the transmission path of electrons between the cell terminal and the cell tab, effectively reducing the ohmic resistance of the cell transfer piece, and further reducing the ohmic resistance of the cell structure, improving the charge and discharge efficiency of the cell structure, reducing the heat dissipation requirement, increasing the power output, extending the service life, and enhancing the low-temperature performance.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0026] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0027] Figure 1 It is a schematic structural diagram of a cell transfer piece according to an embodiment of the present disclosure.

[0028] Figure 2 It is a partial structural schematic diagram of a cell structure according to an embodiment of the present disclosure, in which the cell tab and the cell body are schematically shown in the figure.

[0029] Description of the Reference Numerals

[0030] 1. TAB body; 10. First welding area; 101. First edge; 102. Second edge; 11. First body edge; 12. Second body edge;

[0031] 2. TAB arm; 20. Second welding area; 201. Third edge; 202. Fourth edge; 21. First arm edge; 22. Second arm edge;

[0032] 30. Spacing groove; 100. Battery cell TAB; 200. Battery cell tab; 2001. Main body plate; 2002. Bending part; 2003. Installation groove; 300. Battery cell body;

[0033] A. First direction; B. Second direction; a. First axis. Detailed implementation manners

[0034] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0035] In the present disclosure, unless otherwise stated, the orientation terms such as "first direction, second direction" refer to two intersecting directions, and specifically, reference may be made to Figure 1 as shown. For example, the first direction and the second direction may be perpendicular to each other. The terms such as "first, second" are only used to distinguish one element from another element, and do not have sequence and importance.

[0036] Referring to Figure 1 as shown, the present disclosure provides a battery cell TAB 100, which includes a TAB body 1 and at least one TAB arm 2; the TAB arm 2 is connected to one side of the TAB body 1 along the first direction A; the TAB body 1 is provided with a first welding area 10 for welding with a battery cell pole (not shown); the TAB arm 2 is provided with a second welding area 20 for welding with a battery cell tab 200; the first welding area 10 and the second welding area 20 are not connected.

[0037] Among them, the dimension between the center of gravity of the first welding area 10 and the center of gravity of the second welding area 20 is the first dimension. The projection length of the first welding area 10 in the first direction A is L1, the projection length of the first welding area 10 in the second direction B is L2, the projection length of the second welding area 20 in the first direction A is L3, and the projection length of the second welding area 20 in the second direction B is L4. The first dimension is not greater than (L1 + L2) / 2 + (L3 + L4) / 2.

[0038] It should be noted that when reducing the internal resistance of the battery cell structure, the following effects can be brought:

[0039] 1) Improve the charge and discharge efficiency: The lower the internal resistance of the battery cell structure, the less energy loss during the charge and discharge process, so that the charge and discharge efficiency of the battery cell structure can be improved.

[0040] 2) Reduce heat generation: The heat generated by the battery cell structure during the charge and discharge process is proportional to the internal resistance. Reducing the internal resistance can effectively reduce the heat generation of the battery cell structure during operation, thereby reducing the demand for heat dissipation and improving the thermal management performance.

[0041] 3) Improve power output: The reduction of the internal resistance of the battery cell structure means that under the same current output, the voltage inside the battery cell structure decreases, so a higher power output can be provided.

[0042] 4) Prolong the service life: Due to the improvement of the charge and discharge efficiency and the reduction of heat, the service life of the battery cell structure can be effectively prolonged.

[0043] 5) Enhance low-temperature performance: In a low-temperature environment, the internal resistance of the battery cell structure will increase. Reducing the internal resistance helps to improve the performance of the battery cell structure under low-temperature conditions.

[0044] In the above technical solution, by setting the first welding area 10 on the adapter plate body 1 and the second welding area 20 on the adapter arm 2, and welding the first welding area 10 to the battery cell pole and the second welding area 20 to the battery cell tab 200, that is, the electrical connection between the battery cell tab 200 and the battery cell pole is realized through the battery cell adapter 100. In addition, since the first welding area 10 and the second welding area 20 are not connected, the problem of overlapping welding can be effectively avoided. In addition, by limiting the first dimension and limiting it to not be greater than (L1 + L2) / 2 + (L3 + L4) / 2, the first welding area 10 and the second welding area 20 can be made to approach each other, effectively shortening the transmission path of electrons between the battery cell pole and the battery cell tab 200, effectively reducing the ohmic resistance of the battery cell adapter 100, and further reducing the ohmic resistance of the battery cell structure, improving the charge and discharge efficiency of the battery cell structure, reducing the heat dissipation demand, improving the power output, prolonging the service life, and enhancing the low-temperature performance.

[0045] Optionally, the first dimension is not greater than 0.36 * (L1 + L4), or the first dimension is not greater than 0.36 * (L2 + L3); or the first dimension is not greater than 0.36 * (L1 + L4) and not greater than 0.36 * (L2 + L3); or the first dimension is not greater than 0.36 * (L1 + L2), or the first dimension is not greater than 0.36 * (L3 + L4); or the first dimension is not greater than 0.36 * (L1 + L2) and not greater than 0.36 * (L3 + L4). Or, the first dimension is not greater than 0.5 * (L1 + L2 + L3 - L4), or the first dimension is not greater than 0.5 * (L2 + L3 + L4 - L1), or the first dimension is not greater than 0.5 * (L1 + L2 - L3 + L4), or the first dimension is not greater than 0.5 * (L1 - L2 + L3 + L4).

[0046] By further limiting the size of the first dimension to be smaller, the first welding area 10 and the second welding area 20 can be made closer to each other, further shortening the transmission path of electrons between the cell terminal post and the cell tab 200.

[0047] In one embodiment, referring to Figure 1 As shown, the above-mentioned transfer arms 2 are provided in two, and both of the two transfer arms 2 are connected to the same side of the transfer piece body 1 along the first direction A, and the two transfer arms 2 are spaced along the second direction B and jointly enclose a spacer groove 30 with the transfer piece body 1; wherein, the first direction A intersects with the second direction B. Among them, by providing the transfer arms 2 in two, and each transfer arm 2 is provided with a second welding area 20, the welding area can be effectively increased, and the stability of the cell transfer piece 100 welded to the cell tab 200 can be improved.

[0048] Optionally, referring to Figure 1 As shown, the transfer piece body 1 is symmetrically arranged about a first axis a extending along the first direction A, and the two transfer arms 2 are symmetrically arranged about the first axis a; wherein, the first welding area 10 is symmetrically arranged about the first axis a, and the two second welding areas 20 of the two transfer arms 2 are symmetrically arranged about the first axis a.

[0049] In this embodiment, the transfer piece body 1, the two transfer arms 2, the first welding area 10, and the second welding area 20 are all symmetrically arranged about the first axis a. This symmetrical design can evenly distribute the first welding area 10 and the second welding area 20, improving the welding effect.

[0050] In addition, referring to Figure 1As shown, the projected length L2 of the first welding area 10 in the second direction B can be greater than the projected length L5 of the spacer groove 30 in the second direction B. This can prevent the first welding area 10 from being too small, which would cause a greater temperature rise compared to the second welding area 20 and form an overcurrent bottleneck.

[0051] In other embodiments, referring to Figure 1 As shown, the first welding area 10 includes first edges 101 disposed opposite to each other along the first direction A, and the adapter plate body 1 includes first body edges 11 disposed opposite to each other along the first direction A; wherein, the first edges 101 are arranged to approach the first body edges 11 in the first direction A.

[0052] In this embodiment, by arranging the first edges 101 to approach the first body edges 11 in the first direction A, on the one hand, the first welding area 10 can be arranged to approach the second welding area 20, shortening the path of electrons. On the other hand, the welding area of the first welding area 10 can be increased as much as possible to improve the welding stability. The distance between the first edges 101 and the first body edges 11 in the first direction A can approach 0, but not be 0, to avoid reducing production capacity and the yield rate.

[0053] In another way, referring to Figure 1 As shown, the first welding area 10 includes second edges 102 disposed opposite to each other along the second direction B, and the adapter plate body 1 includes second body edges 12 disposed opposite to each other along the second direction B; wherein, the second edges 102 are arranged to approach the second body edges 12 in the second direction B. Thereby, the welding area of the first welding area 10 can be effectively increased to improve the welding stability. The distance between the second edges 102 and the second body edges 12 in the second direction B can approach 0, but not be 0, to avoid reducing production capacity and the yield rate.

[0054] Optionally, referring to Figure 1 As shown, the transfer arm 2 includes first arm edges 21 disposed opposite to each other along the first direction A, and the second welding area 20 includes third edges 201 disposed opposite to each other along the first direction A; wherein, the third edges 201 are arranged to approach the first arm edges 21 in the first direction A.

[0055] In this embodiment, by arranging the third edges 201 to approach the first arm edges 21 in the first direction A, on the one hand, the second welding area 20 can be arranged to approach the first welding area 10, shortening the path of electrons. On the other hand, the welding area of the second welding area 20 can be increased as much as possible to improve the welding stability. The distance between the third edges 201 and the first arm edges 21 in the first direction A can approach 0, but not be 0, to avoid reducing production capacity and the yield rate.

[0056] In another embodiment, referring toFigure 1 As shown, the transfer arm 2 includes second arm edges 22 oppositely arranged along the second direction B, and the second welding area 20 includes fourth edges 202 oppositely arranged along the second direction B; wherein, the fourth edges 202 are arranged approaching the second arm edges 22 in the second direction B, and the first direction A and the second direction B intersect.

[0057] In this embodiment, by arranging the fourth edges 202 approaching the second arm edges 22, the welding area of the second welding area 20 can be effectively increased, and the welding stability can be improved. The distance between the fourth edges 202 and the second arm edges 22 in the second direction B can approach 0, but not be 0, to avoid reducing production capacity and the yield rate.

[0058] Optionally, the first welding area 10 is used to weld with the cell pole through laser welding, and the second welding area 20 is used to weld with the cell tab 200 through ultrasonic welding. However, the present disclosure does not limit the specific ways of welding the cell adapter 100 to the cell pole and the cell tab. In addition, there is no overlapping part between the first welding area 10 and the second welding area 20, because if the laser welding mark overlaps with the ultrasonic welding mark, the laser welding cannot penetrate the overlapping part, resulting in the failure of laser welding.

[0059] In another embodiment, the projection of the spacer groove 30 in the first direction A is located within the projection of the first welding area 10 in the first direction A, which can shorten the path of electrons transferring between the first welding area 10 and the second welding area 20, improve the charge and discharge efficiency of the cell structure, reduce the heat dissipation requirement, improve the power output, extend the service life, and enhance the low-temperature performance.

[0060] In other embodiments, the projection of the first welding area 10 in the first direction A and the projection of the second welding area 20 in the first direction A partially overlap. This can enable the first welding area 10 and the second welding area 20 to be arranged opposite to each other in the first direction A, shortening the electron transfer path.

[0061] The present disclosure also provides a cell structure, which includes a cell upper cover (not shown), a cell body 300, a cell pole (not shown), a cell tab 200, and the above-mentioned cell adapter 100.

[0062] Among them, the cell terminal is disposed on the cell upper cover, the cell tab 200 is disposed on the cell body 300, the cell tab 200 includes a main body plate 2001 and at least one bent portion 2002, the bent portion 2002 is arranged in one-to-one correspondence with the transfer arm 2, and the bent portion 2002 is bent and connected to the main body plate 2001 and defines an installation groove 2003 with the main body plate 2001; the main body plate 2001 is connected to the cell body 300, the transfer arm 2 is disposed in the installation groove 2003, and the second welding area 20 of the transfer arm 2 is welded to the bent portion 2002.

[0063] In the above technical solution, the first welding area 10 is provided on the adapter plate body 1, the second welding area 20 is provided on the transfer arm 2, and the first welding area 10 is welded to the cell terminal, and the second welding area 20 is welded to the cell tab 200, that is, the electrical connection between the cell tab 200 and the cell terminal is realized through the cell adapter plate 100. In addition, the first welding area 10 and the second welding area 20 are arranged to approach each other in the first direction A, which can effectively shorten the transmission path of electrons between the cell terminal and the cell tab 200, effectively reduce the ohmic resistance of the cell adapter plate 100, and further reduce the ohmic resistance of the cell structure, improve the charge and discharge efficiency of the cell structure, reduce the heat dissipation requirement, improve the power output, extend the service life, and enhance the low-temperature performance.

[0064] In addition, the bent portion 2002 of the cell tab 200 is bent and connected to the main body plate 2001 and defines an installation groove 2003 with the main body plate 2001, and the transfer arm 2 is disposed in the installation groove 2003 and welded to the bent portion 2002. The bent portion 2002 can arrange the second welding area 20 in the installation groove 2003 to avoid the exposure of the second welding area 20, playing a good protective role. In addition, the bent portion 2002 can also play a role in limiting and stopping the transfer arm 2. For example, both the transfer arm 2 and the bent portion 2002 are provided in two, and the bent portion 2002 is connected to both sides of the main body plate 2001 along the second direction B.

[0065] The present disclosure also provides a battery pack, which includes the above-mentioned cell structure.

[0066] The present disclosure further provides a vehicle, which includes the above-mentioned battery pack.

[0067] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include well-known knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0068] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A battery cell adapter, characterized in that: The battery cell adapter comprises an adapter body and at least one adapter arm; the adapter arm is connected to one side of the adapter body along a first direction; the adapter body is provided with a first welding area, the first welding area is used for welding with the battery cell pole; the adapter arm is provided with a second welding area, the second welding area is used for welding with the battery cell tab, and the first welding area is not connected with the second welding area; Wherein, the dimension between the center of gravity of the first welding area and the center of gravity of the second welding area is a first dimension; The projection length of the first welding area in the first direction is L1, the projection length of the first welding area in the second direction is L2, the projection length of the second welding area in the first direction is L3, and the projection length of the second welding area in the second direction is L4; The first size is not greater than (L1+L2) / 2+(L3+L4) / 2, and the first direction is arranged to intersect with the second direction.

2. The battery cell adapter according to claim 1, characterized in that: The first dimension is not greater than (L1+L4)*0.36, or the first dimension is not greater than (L2+L3)*0.36; or the first dimension is not greater than (L1+L4)*0.36 and not greater than (L2+L3)*0.36; or, The first dimension is not greater than (L1+L2)*0.36, or the first dimension is not greater than (L3+L4)*0.36; or the first dimension is not greater than (L1+L2)*0.36 and not greater than (L3+L4)*0.

36.

3. The battery cell adapter according to claim 1, characterized in that: The first size is not greater than (L1+L2+L3-L4)*0.5, or the first size is not greater than (L2+L3+L4-L1)*0.5, or the first size is not greater than (L1+L2-L3+L4)*0.5, or the first size is not greater than (L1-L2+L3+L4)*0.

5.

4. The battery cell adapter according to any one of claims 1 to 3, characterized in that: The two transfer arms are provided with two, and both of the two transfer arms are connected to the same side of the transfer plate body along the first direction, and the two transfer arms are spaced apart along the second direction and together with the transfer plate body form a spacing groove; The adapter plate body is symmetrically arranged about a first axis extending along the first direction, and the two adapter arms are symmetrically arranged about the first axis; The first welding region is symmetrically arranged about the first axis, and the two second welding regions of the two transfer arms are symmetrically arranged about the first axis.

5. The battery cell adapter according to claim 4, characterized in that: A projection length L2 of the first welding area in the second direction is greater than a projection length L5 of the spacing groove in the second direction.

6. The battery cell adapter according to claim 5, characterized in that: The projection of the spacing groove in the first direction is located within the projection of the first welding area in the first direction.

7. The battery cell adapter according to claim 4, characterized in that: A projection of the first welding area in the first direction partially overlaps with a projection of the second welding area in the first direction.

8. A battery cell structure, characterized in that: The battery cell structure comprises a battery cell cover, a battery cell body, a battery cell pole, a battery cell tab, and a battery cell adapter sheet as described in any one of claims 1 to 7; The battery cell pole is arranged on the battery cell upper cover, and the battery cell tab is arranged on the battery cell body; The battery cell tab includes a main body plate and at least one bent portion, the bent portion is arranged in a one-to-one correspondence with the transfer arm, and the bent portion is bently connected to the main body plate and defines a mounting groove with the main body plate; the main body plate is connected to the battery cell body, the transfer arm is arranged in the mounting groove, and the second welding area of ​​the transfer arm is welded to the bent portion.

9. A battery pack, characterized in that: The battery pack includes the battery cell structure according to claim 8.

10. A vehicle, characterized in that: The vehicle includes the battery pack according to claim 9.

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