Battery pack, battery pack and electric equipment

Abstract

The utility model relates to a battery pack, a battery pack and electric equipment. The battery pack comprises a first battery cell and a second battery cell, wherein a first pole is arranged on the end surface of the first battery cell; a second pole is arranged on the end face of the second battery cell, and the second pole is arranged opposite to the first pole; the electric connecting piece comprises a first connecting part, a second connecting part and a third connecting part connected with the first connecting part and the second connecting part; the first connecting part is electrically connected with the first pole, and the second connecting part is electrically connected with the second pole; and the elastic body is arranged between the first connecting part and the second connecting part and is in a compressed state. According to the electric connecting piece, space can be effectively saved, the elastic body plays a role in supporting the electric connecting piece so that the electric connecting piece can be tightly attached to the pole columns, meanwhile, the distance and parallelism tolerance between the two pole columns can be absorbed, and the stability and reliability of electric connection are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack, a battery package and electrical equipment. Background Art

[0002] The battery pack is the main power source for new energy vehicles. There are multiple battery cells inside the battery pack, and the battery cells need to be connected in series or in parallel to form an electrical connection circuit to power the vehicle. The battery cells are electrically connected through electrical connectors. However, the current electrical connectors take up a large space, especially when the poles of two battery cells are arranged relative to each other. Moreover, the electrical stability and reliability of the current connection between the electrical connector and the battery pole need to be further improved. Utility Model Content

[0003] The present application provides a battery pack, a battery package and an electrical device to solve or at least improve the above-mentioned technical problems, so as to save space and improve the stability of electrical connection.

[0004] One aspect of the present application provides a battery pack, comprising: a first battery cell, a first electrode being provided on an end surface of the first battery cell; a second battery cell, a second electrode being provided on an end surface of the second battery cell, the second electrode being arranged opposite to the first electrode; an electrical connector, the electrical connector comprising a first connecting portion and a second connecting portion, and a third connecting portion connecting the first connecting portion and the second connecting portion; the first connecting portion is electrically connected to the first electrode, and the second connecting portion is electrically connected to the second electrode; and an elastomer, the elastomer being arranged between the first connecting portion and the second connecting portion and being in a compressed state.

[0005] The electrical connector of the present application can effectively save space, and laser welding with the pole can be achieved in a smaller space through the first connecting part and the second connecting part, which simplifies the welding process and improves the welding performance; and the elastomer in a compressed state supports the electrical connector so that the electrical connector and the pole fit tightly, and at the same time the elastomer can absorb the spacing and parallelism tolerance between the two poles, thereby improving the stability and reliability of the electrical connection.

[0006] Furthermore, the first connecting portion and the second connecting portion are arranged in parallel.

[0007] Furthermore, the elastic body is provided with a through hole, and the axis of the through hole is parallel to the plane where the first connecting portion is located.

[0008] Furthermore, the elastic body includes a main body and a convex rib arranged on the outer surface of the main body; the convex rib abuts against the first connecting portion, and / or the convex rib abuts against the second connecting portion.

[0009] Furthermore, the material of the elastomer is rubber.

[0010] Furthermore, the third connecting portion is a flexible structure.

[0011] Furthermore, the electrical connector includes multiple layers of metal foils stacked together; wherein the layers of metal foils in the regions where the first connecting portion and the second connecting portion are located are welded, and the layers of metal foils in the region where the third connecting portion is located are not welded.

[0012] Furthermore, the first connection portion and the second connection portion are both plate-shaped; the first connection portion is welded to the first pole, and the second connection portion is welded to the second pole.

[0013] Furthermore, both the first pole and the second pole are provided with chamfers.

[0014] In some specific embodiments, the third connection portion is X-shaped and has four connection ends, two connection ends close to the first pole are connected to the first connection portion, and two connection ends close to the second pole are connected to the second connection portion.

[0015] In some specific embodiments, the third connection portion is connected to an end of the first connection portion and an end of the second connection portion, and is arc-shaped or V-shaped.

[0016] In some specific embodiments, the third connecting portion is connected to a middle portion of the first connecting portion and a middle portion of the second connecting portion.

[0017] Furthermore, the electrical connector also includes a first extension portion extending from the first connection portion to the first battery cell, and a second extension portion extending from the second connection portion to the second battery cell; the first extension portion is electrically connected to the first pole, and the second extension portion is electrically connected to the second pole.

[0018] In addition, the present application also provides a battery pack, which includes a battery pack according to any of the above technical solutions.

[0019] Finally, the present application also provides an electrical device, which includes the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the battery pack of Example 1 of the present application.

[0021] Figure 2 It is a schematic diagram of the structure of the electrical connector in Example 1 of the present application.

[0022] Figure 3It is a schematic diagram of the structure of the battery pack of the second embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the structure of the electrical connector in the second embodiment of the present application.

[0024] Figure 5 It is a schematic diagram of the structure of the battery pack of the third embodiment of the present application.

[0025] Figure 6 It is a schematic diagram of the structure of the electrical connector in the third embodiment of the present application.

[0026] Figure 7 It is a schematic diagram of the structure of the battery pack of the fourth embodiment of the present application.

[0027] Figure 8 It is a schematic diagram of the structure of the electrical connector in the fourth embodiment of the present application.

[0028] Fig. 9 It is a schematic diagram of the structure of the battery pack of the fifth embodiment of the present application.

[0029] Fig.10 It is a schematic diagram of the structure of the electrical connector in the fifth embodiment of the present application.

[0030] Fig.11 It is a schematic diagram of the structure of the battery pack of Example 6 of the present application.

[0031] Fig.12 It is a schematic diagram of the structure of the electrical connector in Example 6 of the present application.

[0032] FIG. 13 is a schematic diagram of the structure of the elastomer in an embodiment of the present application. DETAILED DESCRIPTION

[0033] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation methods" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0037] Embodiment 1

[0038] See also Figure 1 to Figure 2 , provides a battery pack, including: a first battery cell 100 and a second battery cell 200 arranged in a direction, an electrical connector 300 connecting the first battery cell 100 and the second battery cell 200 , and an elastic body 400 disposed in the electrical connector 300 .

[0039] Specifically, the end surface of the first battery cell 100 is provided with a first pole 110, and the end surface of the second battery cell 200 is provided with a second pole 220, and the second pole 220 is arranged opposite to the first pole 110. Exemplarily, the first battery cell 100 and the second battery cell 200 are blade batteries, and the positive and negative poles are respectively arranged on their two opposite end surfaces. For example, one of the first pole and the second pole is a positive pole, and the other is a negative pole. Of course, in some other embodiments, the battery cell can also be a square shell battery cell or a cylindrical battery cell.

[0040] The electrical connector 300 connects the first pole 110 and the second pole 220. Specifically, the electrical connector 300 includes a first connection portion 310 and a second connection portion 320, and a third connection portion 330 connecting the first connection portion 310 and the second connection portion 320. Among them, the first connection portion 310 is electrically connected to the first pole 110, and the second connection portion 320 is electrically connected to the second pole 200. For example, the electrical connector 300 is electrically connected to the pole by laser welding. When the electrical connector 300 is assembled in place, the laser reaches the junction of the electrical connector and the pole from the gap formed between the two battery cells to fuse the two. In this embodiment, in order to facilitate welding and increase the current-carrying area, the first connection portion 310 and the second connection portion are arranged in parallel, and the first connection portion 310 and the second connection portion 320 are plate-like structures that fit the outer surface of the pole. For example, the material of the electrical connector 300 is aluminum or copper.

[0041] Continue to see Figure 2In this embodiment, the third connection part 330 is X-shaped to form four connection ends, two connection ends close to the first pole 110 are connected to the first connection part 310, and two connection ends close to the second pole 220 are connected to the second connection part 320. In other words, the electrical connector 300 has two upper and lower first connection parts 310 and two upper and lower second connection parts 320, and the first connection part 310 and the second connection part 320 are respectively located on the left and right sides. Exemplarily, the electrical connector 300 can be integrally formed by an extrusion process. Of course, the electrical connector 300 can also be made by welding multiple parts into one.

[0042] The elastic body 400 is disposed between the first connection part 310 and the second connection part 320 and is in a compressed state. Specifically, in this embodiment, there are two elastic bodies 400, one of which is disposed between the upper first connection part 310 and the second connection part 320, and the other is disposed between the lower first connection part 310 and the second connection part 320, so that the force of the electrical connector is more balanced.

[0043] In this way, the above-mentioned design of the electrical connector can effectively save space, and laser welding with the pole can be achieved in a smaller space through the first connecting part and the second connecting part, which simplifies the welding process and improves the welding performance; and the elastomer in a compressed state supports the electrical connector so that the electrical connector and the pole fit tightly, and at the same time the elastomer can absorb the spacing and parallelism tolerance between the two poles, thereby improving the stability and reliability of the electrical connection.

[0044] In a specific embodiment, see Fig.13a The elastic body 400 is a block-shaped solid structure made of rubber to ensure elasticity requirements and has good insulation and durability.

[0045] In another specific embodiment, see Fig.13b The elastic body 400 is provided with a through hole 410, and the axis of the through hole 410 is parallel to the plane where the first connecting portion 310 is located, that is, it is also parallel to the plane where the second connecting portion 320 is located. Exemplarily, there are a plurality of through holes 410 arranged at intervals. Therefore, the provision of the through holes makes it easier for the elastic body 400 to be assembled between the first connecting portion 310 and the second connecting portion 320, and the deformation is more uniform and controllable.

[0046] In yet another specific embodiment, see Fig.13cThe elastic body 400 includes a main body 420 and a convex rib 430 disposed on the outer surface of the main body 420. The convex rib 430 is the main deformation part, so it improves the controllability of the deformation. The convex rib 430 is disposed on the left and right sides of the main body 420, so that the convex rib on one side abuts against the first connecting part 310, and the convex rib on the other side abuts against the second connecting part 320. Exemplarily, each side of the convex rib 430 has two spaced apart ribs to improve the uniformity of the force.

[0047] In addition, in order to absorb tolerance and impact on the weld during vibration, the third connection part 330 of the electrical connector 300 is flexibly set. Exemplarily, the electrical connector 300 includes multiple layers of metal foils stacked, wherein the layers of metal foils in the area where the first connection part 310 and the second connection part 320 are located are welded, and the layers of metal foils welded as one can ensure reliable welding with the pole, and the multiple layers of metal foils in the area where the third connection part 330 is located are not welded, thereby ensuring good flexibility. For example, the metal foil is aluminum foil. It can be understood that in this embodiment, the electrical connector can be welded by multiple parts.

[0048] Continue to see Figure 1 During welding, the top of the first connecting part 310 and the second connecting part 320 are flush with the upper surface of the pole, and the bottom of the first connecting part 310 and the second connecting part 320 are flush with the lower surface of the pole, thereby improving welding performance. Furthermore, the first pole 110 and the second pole 220 are both provided with chamfers, and during welding, the electrical connector 300 melts and fills the chamfers, making the connection between the electrical connector 300 and the pole more secure.

[0049] In addition, the explosion-proof valve of the battery cell is arranged on the upper surface or the lower surface of the battery cell to prevent it from interfering with the pole or the electrical connector.

[0050] Embodiment 2

[0051] See also Figure 3 and Figure 4, the difference between this embodiment and the first embodiment is that the structure of the electrical connector is different. In this embodiment, an electrical connector 500 is arranged between the first pole 110 and the second pole 220. In addition to having the same structure as the electrical connector 300 in the first embodiment, the electrical connector 500 also includes a first extension portion 511 extending from the first connection portion 510 to the first battery cell 100, and a second extension portion 521 extending from the second connection portion 520 to the second battery cell 200, wherein the first extension portion 511 is also electrically connected to the first pole 110, and the second extension portion 521 is also electrically connected to the second pole 220, for example, by laser welding. Exemplarily, the first extension portion 511 has two spaced apart, and the spacing between the two is equivalent to the width of the pole; the second extension portion 521 has two spaced apart, and the spacing between the two is equivalent to the width of the pole. In this way, the electrical connector can wrap the pole during assembly, further increasing the current-carrying area and the length of the weld between the pole and the pole, so as to improve the reliability of welding.

[0052] Embodiment 3

[0053] See also Figure 5 and Figure 6 , the difference between this embodiment and the first embodiment is that the structure of the electrical connector is different. In this embodiment, an electrical connector 600 is arranged between the first pole 110 and the second pole 220, which includes a first connecting portion 610 and a second connecting portion 620 arranged in parallel, and a third connecting portion 630 connecting the first connecting portion 610 and the second connecting portion 620. Among them, the first connecting portion 610 is electrically connected to the first pole 110, and the second connecting portion 620 is electrically connected to the second pole 200. The first connecting portion 610 and the second connecting portion 620 are plate-like structures, which are in contact with the outer surface of the pole.

[0054] The third connection part 630 is connected to the end of the first connection part 610 and the end of the second connection part 620 and is arc-shaped, for example, its cross section is semicircular. In this embodiment, only one third connection part 630 is provided, so that the electrical connector 600 is U-shaped as a whole.

[0055] The U-shaped electrical connector 600 has a variable structural advantage. Specifically, in the initial state, that is, during welding, the first connection portion 610 and the second connection portion 620 of the electrical connector 600 are first at a preset angle, for example, 90°, 60°, 45°, 30°, etc., so that there is a larger opening between the first battery cell 100 and the second battery cell 200 to facilitate welding and improve the welding process. When the welding is completed, the two battery cells are rotated to be parallel, that is, the first connection portion 610 and the second connection portion 620 are in a parallel state, thereby completing the production of the battery cell group. Optionally, in the embodiment, the third connection portion 630 of the electrical connector 600 is flexibly arranged to facilitate the rotation of the battery cell. For example, the electrical connector is made of a stacked multi-layer metal foil, and the layers of metal foil in the area where the first connection portion and the second connection portion are located are welded as a whole, and the multi-layer metal foil in the area where the third connection portion is located is not welded to ensure good flexibility.

[0056] In addition, illustratively, two elastic bodies 400 are also disposed between the first connection portion 610 and the second connection portion 620 .

[0057] Of course, it is understandable that, on the basis of the electrical connector 600, a first extension portion and a second extension portion as in the second embodiment may be further provided, which will not be elaborated here and will not deviate from the essence of the present application.

[0058] Embodiment 4

[0059] See also Figure 7 and Figure 8 The only difference between this embodiment and the third embodiment is that there are two third connecting parts 730, so that the electrical connector 700 is in a track shape as a whole.

[0060] Embodiment 5

[0061] See also Fig. 9 and Fig.10 , the difference between this embodiment and the fourth embodiment is that the third connection part 830 in the electrical connector 800 is different in form. The third connection part 830 is connected to the end of the first connection part 810 and the end of the second connection part 820, and is V-shaped. Exemplarily, there are two third connection parts 830, which are respectively connected to the upper ends of the first connection part 810 and the second connection part 820 and the lower ends of the first connection part 810 and the second connection part 820, and the two third connection parts 830 are respectively in a positive V shape and an inverted V shape.

[0062] Of course, it is understandable that only one third connecting portion may be provided, which does not deviate from the essence of the present application.

[0063] Embodiment 6

[0064] See also Fig.11 and Fig.12, the difference between this embodiment and the first embodiment is that the structure of the electrical connector is different. In this embodiment, an electrical connector 900 is provided between the first pole 110 and the second pole 220, and includes a first connecting portion 910 and a second connecting portion 920 arranged in parallel, and a third connecting portion 930 connecting the first connecting portion 910 and the second connecting portion 920. Among them, the first connecting portion 910 is electrically connected to the first pole 110, and the second connecting portion 920 is electrically connected to the second pole 200. The first connecting portion 910 and the second connecting portion 920 are plate-like structures, which are in contact with the outer surface of the pole.

[0065] The third connection part 930 is connected to the middle of the first connection part 910 and the middle of the second connection part 920. Exemplarily, the third connection part 930 is a rectangular block structure. Of course, in some other embodiments, the third connection part 930 can also be other shapes, such as X-shaped, N-shaped, etc. It can be understood that the electrical connector 900 can be made in one piece by an extrusion process, or by welding multiple parts into one piece.

[0066] Exemplarily, elastic bodies 400 are disposed on both upper and lower sides of the third connection portion 930 and between the first connection portion 910 and the second connection portion 920 .

[0067] Of course, it is understandable that, on the basis of the electrical connector 900, a first extension portion and a second extension portion as in the second embodiment may be further provided, which will not be elaborated here and will not deviate from the essence of the present application.

[0068] In addition, the present application also provides a battery pack, which includes the battery pack as described above. Exemplarily, the battery pack includes a plurality of battery packs, which are connected in series or in parallel to form an electrical connection circuit of the entire battery pack.

[0069] Finally, the present application also provides an electric device, which includes the above-mentioned battery pack. For example, the electric device is a vehicle.

[0070] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.

Claims

1. A battery pack, characterized in that: include: A first battery cell, wherein a first pole is provided on an end surface of the first battery cell; A second battery cell, wherein a second pole is disposed on an end surface of the second battery cell, and the second pole is disposed opposite to the first pole; An electrical connector, the electrical connector comprising a first connecting portion and a second connecting portion, and a third connecting portion connecting the first connecting portion and the second connecting portion; the first connecting portion is electrically connected to the first pole, and the second connecting portion is electrically connected to the second pole; An elastic body is arranged between the first connecting portion and the second connecting portion and is in a compressed state.

2. The battery pack according to claim 1, characterized in that: The first connecting portion and the second connecting portion are arranged in parallel.

3. The battery pack according to claim 2, characterized in that: The elastic body is provided with a through hole, and the axis of the through hole is parallel to the plane where the first connecting portion is located.

4. The battery pack according to claim 2, characterized in that: The elastic body comprises a main body and convex ribs arranged on the outer surface of the main body; The convex rib abuts against the first connecting portion, and / or the convex rib abuts against the second connecting portion.

5. The battery pack according to claim 1, characterized in that: The material of the elastic body is rubber.

6. The battery pack according to claim 1, characterized in that: The third connecting portion is a flexible structure.

7. The battery pack according to claim 6, characterized in that: The electrical connector includes multiple layers of metal foils stacked in layers; The metal foil layers in the regions where the first connection portion and the second connection portion are located are welded, and the metal foil layers in the region where the third connection portion is located are not welded.

8. The battery pack according to claim 2, characterized in that: The first connecting portion and the second connecting portion are both plate-shaped; The first connection portion is welded to the first pole, and the second connection portion is welded to the second pole.

9. The battery pack according to claim 8, characterized in that: The first pole and the second pole are both provided with chamfers.

10. The battery pack according to claim 8, characterized in that: The third connection portion is X-shaped and has four connection ends, two connection ends close to the first pole are connected to the first connection portion, and two connection ends close to the second pole are connected to the second connection portion; Alternatively, the third connection portion is connected to an end of the first connection portion and an end of the second connection portion, and is arc-shaped or V-shaped; Alternatively, the third connection portion is connected to a middle portion of the first connection portion and a middle portion of the second connection portion.

11. The battery pack according to any one of claims 1 to 10, characterized in that: The electrical connector further includes a first extension portion extending from the first connection portion toward the first battery cell, and a second extension portion extending from the second connection portion toward the second battery cell; The first extension portion is electrically connected to the first pole, and the second extension portion is electrically connected to the second pole.

12. A battery pack, characterized in that: The battery pack comprises a battery pack according to any one of claims 1-11.

13. An electrical equipment, characterized in that: The electric device comprises the battery pack according to claim 12.

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