Battery module and energy storage equipment

Abstract

The embodiment of the utility model relates to the technical field of batteries, and discloses a battery module and energy storage equipment, the battery module comprises at least two batteries and a conductive piece, the at least two batteries are superposed along a first direction, and each battery is provided with two pole columns; the conductive piece comprises a conductive body, at least two welding parts and at least two first connecting parts, the conductive body is provided with at least two mounting ports, one welding part and one first connecting part are both located in one mounting port, one end of one first connecting part is connected with one welding part, the other end of one first connecting part is connected with the conductive body, and in the second direction, the first connecting part is connected with the conductive body; the first connecting part is located between the welding part and the conductive body, and the second direction is perpendicular to the first direction; wherein one welding part is welded with one pole of one battery, and the other welding part is welded with one pole of the other battery. According to the embodiment of the utility model, the risk that the battery is separated from the conductive piece can be reduced.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of energy storage, and particularly to a battery module and an energy storage device. Background Art

[0002] Existing battery modules generally include multiple stacked batteries. A series connection, a parallel connection, or a hybrid connection is formed between the multiple batteries through aluminum bars, thereby constituting a battery module with a large capacity.

[0003] The aluminum bar is fixed and electrically connected to the positive electrode or the negative electrode of the battery by welding. As the usage time of the battery module increases, each battery (square battery) will inevitably expand, resulting in an increase in the thickness of the battery, generating a large tensile force between the battery and the aluminum bar, and thus easily causing the aluminum bar to fall off from the battery. Summary of the Utility Model

[0004] The main technical problem to be solved by the embodiments of the present utility model is to provide a battery module and an energy storage device, which can reduce the tensile force between the battery and the conductive part after the battery expands, and further reduce the risk of detachment between the conductive part and the battery.

[0005] To solve the above technical problem, one technical solution adopted by the embodiments of the present utility model is: to provide a battery module, including at least two batteries and a conductive part. The at least two batteries are stacked along a first direction, and each battery has two pole columns; the conductive part includes a conductive body, at least two welding parts, and at least two first connection parts. The conductive body is provided with at least two installation openings. A welding part and a first connection part are both located in an installation opening. One end of a first connection part is connected to a welding part, and the other end of the first connection part is connected to the conductive body. And along a second direction, a first connection part is located between a welding part and the conductive body, and the second direction is perpendicular to the first direction; one of the welding parts is welded to one pole column of one battery, and the other welding part is welded to one pole column of another battery.

[0006] In some embodiments, there are multiple first connection parts between each welding part and the conductive body. The multiple first connection parts are spaced apart along the first direction. One ends of the multiple first connection parts are all connected to the welding part, and the other ends of the multiple first connection parts are all connected to the conductive body.

[0007] In some embodiments, the first connection part is bent along the second direction.

[0008] In some embodiments, there is an activity space between the welding part and the side wall of the installation opening along the first direction.

[0009] In some embodiments, the conductive body is provided with installation positioning holes for positioning between the conductive part and the battery.

[0010] In some embodiments, the number of installation positioning holes is multiple, and the multiple installation positioning holes are spaced along a first direction. The multiple installation positioning holes are all used for positioning between the conductive member and the battery.

[0011] In some embodiments, the conductive body is provided with welding positioning holes, and the welding positioning holes are used for positioning between the welding part and the battery.

[0012] In some embodiments, the conductive member further includes at least two second connection parts. One end of a second connection part is connected to a welding part, and the other end of the second connection part is connected to the conductive body. And along a second direction, the second connection part and the first connection part are respectively located on both sides of the welding part.

[0013] In some embodiments, the number of conductive members is multiple, and the multiple conductive members are all used for welding with the pole columns of multiple batteries.

[0014] To solve the above technical problems, another technical solution adopted in the embodiments of the present utility model is: to provide an energy storage device including the above-mentioned battery module.

[0015] The beneficial effects of the embodiments of the present utility model are: different from the prior art, in the embodiments of the present utility model, by providing at least two installation openings in the conductive body of the conductive member, a welding part and a first connection part are both located in an installation opening. A welding part is connected to the conductive body through a first connection part, and along a second direction, a first connection part is located between a welding part and the conductive body; one of the welding parts is welded to a pole column of one of the batteries, and the other welding part is welded to a pole column of another battery, so as to realize the series or parallel connection between two batteries. When at least two batteries stacked along the first direction expand, the welding part can move relative to the conductive body, and the first connection part can deform, so as to form a buffering effect, thereby reducing the tension between the battery and the conductive member, and further reducing the risk of detachment between the conductive member and the battery. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual ratio.

[0017] Figure 1 is a schematic structural diagram of a battery module in the prior art;

[0018] Figure 2 is a schematic structural diagram of an aluminum row in the prior art;

[0019] Figure 3 It is a schematic structural diagram of a battery module provided in an embodiment of the present utility model;

[0020] Figure 4 is Figure 3 an enlarged view of the area shown in part A in

[0021] Figure 5 It is a schematic structural diagram of the conductive member including the second connecting portion in an embodiment of the present utility model. Detailed implementation manners

[0022] For the convenience of understanding the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0024] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] To enable readers to better understand the concept of this application, the prior art will be described first below.

[0026] As described in the background art, please refer to Figure 1, a battery module 100' composed of multiple batteries connected in series, parallel or in a combined series-parallel configuration. Electrical connection between each battery 1' needs to be achieved through an aluminum busbar 2'. The aluminum busbar 2' is fixed to the battery 1' by welding. However, as the usage time of the battery module 100' increases, the batteries 1' are prone to swelling, resulting in an increase in the thickness of each battery 1' along the stacking direction of the batteries 1'. Consequently, the tensile force between each battery 1' and the aluminum busbar 2' gradually increases, easily leading to the detachment of the aluminum busbar 2' from the battery 1', and further causing damage to the battery module 100'.

[0027] Please refer to Figure 1 and Figure 2 , in the prior art, to solve the above problems, the aluminum busbar 2' is usually set in a "ji" shape. When the battery 1' swells, along the stacking direction of the battery 1', the "ji" shape structure of the aluminum busbar 2' allows it to generate a stretching distance, thereby forming a buffer distance, and reducing the risk of detachment between the aluminum busbar 2' and the battery 1'. However, even when the aluminum busbar 2' is set in a "ji" shape structure, along the stacking direction of the battery 1', a relatively large tensile force still exists between the battery 1' and the aluminum busbar 2', and the risk of detachment between the aluminum busbar 2' and the battery 1' remains relatively high.

[0028] Therefore, to solve the above problems, the present application provides a battery module and an energy storage device, which can reduce the tensile force between the battery and the conductive component after the battery swells, thereby reducing the risk of detachment between the conductive component and the battery. The following provides a detailed description of the present application.

[0029] Please refer to Figure 3 and Figure 4 , the battery module 100 includes a conductive component 2 and at least two batteries 1. The at least two batteries 1 are stacked along the first direction X. Each battery 1 is provided with two terminal posts 11, one of the terminal posts 11 being the anode and the other being the cathode. The conductive component 2 is respectively welded and fixed to one of the terminal posts 11 of the two batteries 1, thereby achieving series or parallel connection between the two batteries 1. Among them, when the conductive component 2 is connected to the same pole of the two batteries 1, the two batteries 1 form a parallel battery module 100; when the conductive component 2 is connected to different poles of the two batteries 1, the two batteries 1 form a series battery module 100.

[0030] Regarding the above-mentioned conductive component 2, please refer to Figure 3 and Figure 4, the conductive member 2 includes a conductive body 21, at least two welding portions 22, and at least two first connection portions 23. The conductive body 21 is provided with at least two mounting openings 211. The at least two mounting openings 211 correspond to the at least two welding portions 22 one by one. One welding portion 22 and one first connection portion 23 are both located within one mounting opening 211. One end of one first connection portion 23 is connected to one welding portion 22, and the other end of one first connection portion 23 is connected to the conductive body 21. And along the second direction Y, one first connection portion 23 is located between one welding portion 22 and the conductive body 21, where,

[0031] the second direction Y is perpendicular to the first direction X. One of the welding portions 22 is welded to a pole 11 of one of the batteries 1, and the other welding portion 22 is welded to a pole 11 of the other battery 1, so as to realize the series or parallel connection between the two batteries 1. In this embodiment, by providing at least two mounting openings 211 in the conductive body 21 of the conductive member 2, one welding portion 22 and one first connection portion 23 are both located within one mounting opening 211. One welding portion 22 and the conductive body 21 are connected through one first connection portion 23. And along the second direction Y, one first connection portion 23 is located between one welding portion 22 and the conductive body 21. One of the welding portions 22 is welded to a pole 11 of one of the batteries 1, and the other welding portion 22 is welded to a pole 11 of the other battery 1, so as to realize the series or parallel connection between the two batteries 1. When at least two batteries 1 stacked along the first direction X expand, the welding portion 22 can move relative to the conductive body 21 in the first direction X, and the first connection portion 23 can deform, thereby forming a buffering effect, so that the tension between the battery 1 and the conductive member 2 can be reduced, and further the risk of detachment between the conductive member 2 and the battery 1 is reduced.

[0032] In some embodiments, please refer to Figure 3 and Figure 4, there are multiple first connection parts 23 between each welding part 22 and the conductive body 21. Along the first direction X, the multiple first connection parts 23 are spaced apart. One ends of the multiple first connection parts 23 are all connected to the welding part 22, and the other ends of the multiple first connection parts 23 are all connected to the conductive body 21. And in the second direction Y, the multiple first connection parts 23 are all located between the welding part 22 and the conductive body 21. In this embodiment, when the battery 1 expands, the welding part 22 can generate displacement relative to the conductive body 21 in the first direction X, so that one end of the first connection part 23 generates swing relative to the other end in the first direction X. By arranging multiple first connection parts 23 between each welding part 22 and the conductive body 21, on the one hand, the connection strength between the welding part 22 and the conductive body 21 can be increased, and the risk of disconnection of the first connection part 23 during the swing process can be reduced. On the other hand, the connection area between the welding part 22 and the conductive body 21 can be increased, which is beneficial to reducing the resistance between the welding part 22 and the conductive body 21, and thus the current-carrying capacity of the conductive part 2 can be increased.

[0033] In some embodiments, please refer to Figure 3 and Figure 4 , along the second direction Y, the multiple first connection parts 23 are bent. Compared with setting the first connection part 23 as a straight line, bending the first connection part can, in the first aspect, improve the buffering capacity of the first connection part 23. When the battery 1 expands, the pulling force transmitted from the welding part 22 to the conductive body 21 can be reduced, thereby reducing the risk of the welding part 22 detaching from the pole 11 of the battery 1. In the second aspect, bending the first connection part 23 can increase the length of the first connection part 23, thereby increasing the displacement distance of the welding part 22 relative to the conductive body 21 in the first direction X, and further reducing the risk of the welding part 22 detaching from the pole 11. In the third aspect, due to the assembly error of the multiple batteries 1 in the second direction Y, when the first connection part 23 is bent, the welding part 22 can generate displacement relative to the conductive body 21 in the second direction Y, so as to compensate for the assembly error of the multiple batteries 1 in the second direction Y.

[0034] In some embodiments, please refer to Figure 3 and Figure 4 , along the first direction X, there is an activity space 25 between the welding part 22 and the side wall of the mounting opening 211. When the battery 1 expands, the activity space 25 can avoid the movement of the welding part 22 relative to the conductive body 21 in the first direction X, reducing the risk of the welding part 22 directly contacting the side wall of the mounting opening 211, thereby reducing the pulling force generated between the welding part 22 and the battery 1, and further reducing the risk of the welding part 22 detaching from the pole 11 of the battery 1.

[0035] In some embodiments, please refer to Figure 5, the conductive body 21 is provided with mounting and positioning holes 212, and the mounting and positioning holes 212 are used to achieve the positioning between the conductive member 2 and the battery 1. Specifically, when installing the conductive member 2, the conductive member 2 needs to be placed on a jig (not shown in the figure) first. The jig is provided with positioning posts, and the positioning posts are inserted and matched with the mounting and positioning holes 212 to achieve the positioning between the conductive member 2 and the jig. Then, the jig and the conductive member are assembled together onto a battery pack formed by a plurality of batteries 1, so as to achieve the positioning between the battery pack and the conductive member 2. And after the conductive member 2 is welded and fixed to the pole post 11 of the battery 1, the jig can be removed from the battery pack to obtain the battery module 100.

[0036] Further, the number of the mounting and positioning holes 212 is multiple, and the multiple mounting and positioning holes 212 are spaced along the first direction X. Correspondingly, the jig is provided with a plurality of positioning posts, and the plurality of positioning posts correspond to the plurality of mounting and positioning holes 212 one by one. By providing a plurality of mounting and positioning holes 212, the positioning accuracy between the conductive member 2 and the jig can be improved, and further the positioning accuracy between the conductive member 2 and the battery pack can be improved.

[0037] In some embodiments, please refer to Figure 5 , the conductive body 21 is provided with at least two welding positioning holes 213, and the at least two welding positioning holes 213 correspond to the welding parts 22 one by one. The welding positioning holes 213 are used to adjust the position between the welding parts 22 and the pole post 11. Specifically, a marking point can be set on the pole post 11. When the naked eye can see the marking point through the welding positioning hole 213, it indicates that the position between the welding part 22 and the pole post 11 is accurate. At this time, the welding part 22 and the pole post 11 can be welded and fixed.

[0038] In some embodiments, please refer to Figure 5 , the conductive member 2 further includes at least two second connecting parts 24. One second connecting part 24 corresponds to one welding part 22. One end of one second connecting part 24 is connected to one welding part 22, and the other end of one second connecting part 24 is connected to the conductive body 21. And along the second direction Y, the first connecting parts 23 are respectively located on both sides of the welding part 22. In this embodiment, by providing the second connecting parts 24, the second connecting parts 24 connect the conductive body 21 and the welding parts 22, thereby increasing the connection strength between the welding parts 22 and the conductive body 21, and increasing the area for current to pass between the welding parts 22 and the conductive body 21, thereby reducing the resistance between the welding parts 22 and the conductive body 21, which is beneficial to increasing the current-carrying capacity of the conductive member 2.

[0039] In some embodiments, please refer to Figure 5, there are multiple second connecting parts 24 between each welding part 22 and the conductive body 21. Along the first direction X, the multiple second connecting parts 24 are spaced apart. One ends of the multiple second connecting parts 24 are all connected to the welding part 22, and the other ends of the multiple second connecting parts 24 are all connected to the conductive body 21. And in the second direction Y, the multiple second connecting parts 24 are all located between the welding part 22 and the conductive body 21, and the multiple second connecting parts 24 are all located on the side of the welding part 22 away from the first connecting part 23. In this embodiment, by arranging multiple second connecting parts 24 between each welding part 22 and the conductive body 21, the connection strength between the welding part 22 and the conductive body 21 can be further enhanced, and the resistance between the welding part 22 and the conductive body 21 can be further reduced, thereby increasing the current-carrying capacity of the conductive part 2.

[0040] In some embodiments, please refer to Figure 3 , the number of conductive parts 2 is multiple. The welding parts 22 of the multiple conductive parts 2 are respectively welded and fixed to the pole columns 11 in different batteries 1, so that a series or parallel or mixed connection state is formed between the multiple batteries 1, and then a battery module 100 is formed. By arranging multiple conductive parts 2, the number of batteries 1 can be increased, and thus the capacity of the battery module 100 can be increased.

[0041] In the embodiment of the present utility model, by providing at least two mounting openings 211 in the conductive body 21 of the conductive part 2, a welding part 22 and a first connecting part 23 are both located in a mounting opening 211. A welding part 22 is connected to the conductive body 21 through a first connecting part 23. And along the second direction Y, a first connecting part 23 is located between a welding part 22 and the conductive body 21. One of the welding parts 22 is welded to a pole column 11 of one of the batteries 1, and the other welding part 22 is welded to a pole column 11 of another battery 1, so as to realize the series or parallel connection between two batteries 1. When at least two batteries 1 stacked along the first direction X expand, the welding part 22 can move relative to the conductive body 21, and the first connecting part 23 can be deformed, thereby forming a buffering effect, so that the pulling force between the battery 1 and the conductive part 2 can be reduced, and further the risk of detachment between the conductive part 2 and the battery 1 can be reduced.

[0042] The present utility model further provides an embodiment of an energy storage device. The energy storage device includes the above-mentioned battery module 100. For the specific structure and function of the battery module 100, reference can be made to the above-mentioned embodiment, and details will not be described herein one by one.

[0043] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A battery module, characterized in that: include: At least two batteries, the at least two batteries are stacked along a first direction, and each of the batteries has two poles; A conductive member, comprising a conductive body, at least two welding parts and at least two first connecting parts, wherein the conductive body is provided with at least two mounting openings, wherein a welding part and a first connecting part are both located in a mounting opening, wherein one end of a first connecting part is connected to a welding part, and the other end of a first connecting part is connected to the conductive body, and along a second direction, a first connecting part is located between a welding part and the conductive body, and the second direction is perpendicular to the first direction; One of the welding parts is welded to a pole of one of the batteries, and the other welding part is welded to a pole of another of the batteries.

2. The battery module according to claim 1, characterized in that: There are multiple first connection parts between each welding part and the conductive body. The multiple first connection parts are spaced apart along the first direction. One end of the multiple first connection parts is connected to the welding part, and the other end of the multiple first connection parts is connected to the conductive body.

3. The battery module according to claim 1, characterized in that: The first connection portion is bent along the second direction.

4. The battery module according to claim 1, characterized in that: Along the first direction, there is a movable space between the welding portion and the side wall of the installation opening.

5. The battery module according to claim 1, characterized in that: The conductive body is provided with an installation positioning hole, and the installation positioning hole is used for positioning the conductive member and the battery.

6. The battery module according to claim 5, characterized in that: There are multiple installation positioning holes, and the multiple installation positioning holes are distributed at intervals along the first direction. The multiple installation positioning holes are all used for positioning the conductive member and the battery.

7. The battery module according to claim 1, characterized in that: The conductive body is provided with a welding positioning hole, and the welding positioning hole is used for positioning the welding portion and the battery.

8. The battery module according to claim 1, characterized in that: The conductive member also includes at least two second connection parts, one end of a second connection part is connected to a welding part, and the other end of a second connection part is connected to the conductive body, and along the second direction, the second connection part and the first connection part are respectively located on both sides of the welding part.

9. The battery module according to any one of claims 1 to 8, characterized in that: There are multiple conductive members, and each of the multiple conductive members is used for welding with the poles of the multiple batteries.

10. An energy storage device, characterized in that: Comprising a battery module as described in any one of claims 1 to 9.

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