Fixing structure of battery module, battery pack and energy storage device

By adopting the fixing structure of end plates and side plates in the battery module, the assembly process of the battery module is simplified by using the top tightening parts and positioning structure, solving the problem of cumbersome fixing process in the traditional structure, improving production efficiency and reducing Cost, while improving heat dissipation and expansion performance through thermal insulation buffers.

CN222168580UActive Publication Date: 2024-12-13SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202420121749.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-17
Publication Date
2024-12-13
Estimated Expiration
2034-01-17

AI Technical Summary

Technical Problem

In traditional battery module structures, the fixing process of stacking battery cells is complicated and requires a variety of materials such as steel strips and screws, resulting in high manufacturing costs and low production efficiency.

Method used

The fixing structure of the end plate and the side plate is adopted, and the battery cell group is fixed between the end plate and the side plate through the top tightening member, and the positioning structure and thermal insulation buffers are used to simplify the assembly process and reduce the type of material and process.

Benefits of technology

It realizes simplified assembly of battery modules, improves production efficiency, reduces production costs, and improves heat dissipation and expansion performance through thermal insulation buffers.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a fixing structure of a battery module, a battery pack and an energy storage device. The fixing structure of the battery module comprises an end plate, a side plate of a battery pack box body arranged opposite to the end plate, and a jacking piece, the battery module comprises a battery cell group formed by stacking a plurality of battery cells, the two ends, in the stacking direction of the battery cells, of the battery cell group abut against an end plate and a side plate respectively, the end plate is connected to a box body cross beam in the battery pack box body through a jacking part, and the end plate can be close to the side plate along with pushing of the jacking part; and the battery cell group is fixed between the end plate and the side plate. According to the fixing structure of the battery module disclosed by the utility model, the pushing force on the end plate is formed through the pushing of the pushing piece, so that the end plate is close to the side plate, and the battery module is fixed between the end plate and the side plate, so that the battery module can be put into a box and fixed only by the end plate on one side, and the battery module can be stacked without extrusion force; therefore, assembly procedures can be simplified, production efficiency is improved, and production cost is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a fixing structure of a battery module. The utility model also relates to a battery pack provided with the fixing structure of the battery module. At the same time, the utility model also relates to an energy storage device provided with the battery pack. Background Art

[0002] In the traditional battery module structure, the stacked cells are fixed by steel strips and end plates, and then the end plates are fixed to the box beams of the battery pack by long screws. In addition, when the cells are stacked and installed with steel strips, tooling extrusion is required, and the process is complicated. At the same time, the fixed structure of the battery module includes steel strips, end plates, and screws, and there are many types of materials, which increases the manufacturing cost. Utility Model Content

[0003] In view of this, the utility model aims to provide a fixing structure of a battery module, so as to simplify assembly, improve production efficiency and reduce production costs.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A fixing structure of a battery module, the battery module comprising a battery cell group formed by stacking a plurality of battery cells, the fixing structure comprising an end plate, a side plate of a battery pack box arranged opposite to the end plate, and a tightening member;

[0006] The two ends of the cell group along the cell stacking direction are respectively abutted against the end plate and the side plate, and the end plate is connected to the box crossbeam in the battery pack box through the fastening member, and the end plate can be approached to the side plate as pushed by the fastening member, thereby fixing the cell group between the end plate and the side plate.

[0007] Furthermore, a positioning structure is provided between the end plate and the box body cross beam, and the positioning structure is used to position the end plate on the box body cross beam.

[0008] Furthermore, the positioning structure includes a positioning column arranged on the end plate, and a positioning hole arranged on the box cross beam, and the positioning column is located in the positioning hole.

[0009] Furthermore, a first connecting hole is provided on the box crossbeam, and a second connecting hole is provided on the end plate; the tightening member is screwed to the first connecting hole and the second connecting hole in sequence, and as the tightening member is screwed in, the end plate is pushed and moves toward the side plate.

[0010] Furthermore, a first thermal insulation buffer is provided between two adjacent battery cells in the battery cell group; and / or a second thermal insulation buffer is provided between the battery cell group and the end plate, and between the battery cell group and the side plate.

[0011] Furthermore, the first thermal insulation buffer component and / or the second thermal insulation buffer component includes foam.

[0012] Furthermore, the interior of the battery pack box is divided into an electrical compartment and a module compartment by the box crossbeam; the battery module includes a plurality of battery cell groups arranged in the module compartment.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The fixing structure of the battery module described in the utility model is such that the battery cell group in the battery module is clamped between the end plate and the side plate by the end plate arranged on the cross beam of the box body and the side plate of the battery pack box body, and the end plate is pushed toward the side plate by the top fastener, and the battery module is fixed between the end plate and the side plate. The fixing structure of the battery module of this embodiment only requires the end plate on one side to complete the fixing of the battery module into the box. In addition, the stacking of the battery modules does not require extrusion force, thereby simplifying the assembly process, improving production efficiency, reducing production costs, and having a good use effect.

[0015] In addition, the positioning structure is provided to ensure the positioning effect of the end plate on the box crossbeam. The positioning column and the positioning hole are used in combination, which has the characteristics of simple structure and convenient design and implementation. The first connecting hole and the second connecting hole are provided, and the top fastener is screwed in the first connecting hole and the second connecting hole in sequence. By screwing the top fastener into the first connecting hole, the end plate is pushed to move toward the side where the side plate is located, so that the battery pack, that is, the battery module, is clamped between the end plate and the side plate and is better fixed.

[0016] In addition, the first heat-insulating buffer is filled between two adjacent battery cells, which can play a role in heat dissipation and buffering expansion. The second heat-insulating buffer is filled between the battery cell group and the end plate, and between the battery cell group and the side plate, which can also play a role in heat dissipation and buffering expansion. The first heat-insulating buffer and the second heat-insulating buffer are made of foam, which has the characteristics of wide application and easy material acquisition.

[0017] Another object of the present invention is to provide a battery pack, in which the above-mentioned fixing structure of the battery module is provided.

[0018] Another object of the present invention is to provide an energy storage device, wherein the energy storage device has the above-mentioned battery module fixing structure; or, the energy storage device is provided with the above-mentioned battery pack.

[0019] The battery pack and energy storage device of the present invention and the fixing structure of the battery module as described above have the same beneficial effects as those of the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 A structural schematic diagram of a first-viewing angle of a fixing structure of a battery module according to an embodiment of the utility model;

[0022] Figure 2 A structural schematic diagram of a second viewing angle of the fixing structure of the battery module according to an embodiment of the utility model;

[0023] Figure 3 It is a partial enlarged view of the fixing structure of the battery module according to the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the battery pack according to an embodiment of the utility model;

[0025] Description of reference numerals:

[0026] 1. Battery pack box; 2. Box crossbeam; 3. Battery pack; 4. End plate; 5. Fastening member; 6. First thermal insulation buffer; 7. Second thermal insulation buffer;

[0027] 101, side panel; 102, bottom panel; 21, first connection hole; 31, battery cell; 41, second connection hole; 10, electrical compartment; 20, module compartment. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] Embodiment 1

[0033] The present embodiment relates to a fixing structure of a battery module, which is used to fix the battery module. The fixing structure of the battery module can simplify assembly, improve production efficiency and reduce production costs.

[0034] In terms of overall structure, Figures 1 to 3 As shown, the fixing structure of the battery module of this embodiment, hereinafter referred to as the fixing structure, mainly includes an end plate 4, a side plate 101 of the battery pack case 1 arranged opposite to the end plate 4, and a fastening member 5. Among them, the battery module includes a battery cell group 3 formed by stacking a plurality of battery cells 31. The two ends of the battery cell group 3 along the stacking direction of the battery cells 31 are respectively abutted against the end plate 4 and the side plate 101, and the end plate 4 is connected to the box crossbeam 2 in the battery pack case 1 through the fastening member 5, and the end plate 4 can be pushed toward the side plate 101 by the fastening member 5, so as to fix the battery cell group 3 between the end plate 4 and the side plate 101.

[0035] At this time, the pushing force on the end plate 4 is formed through the pushing of the pushing piece, so that the end plate 4 is close to the side plate 101, and the battery module is fixed between the end plate 4 and the side plate 101. In this way, only one side of the end plate 4 is needed to complete the fixing of the battery module into the box, and the battery module stacking does not require extrusion force, thereby simplifying the assembly process, improving production efficiency and reducing production costs.

[0036] For more details, see Figures 1 to 3 As shown, in this embodiment, the battery pack box 1 structurally includes a bottom plate 102 and a plurality of side plates 101 arranged on the bottom plate 102, and the plurality of side plates 101 are connected end to end in sequence to form a frame structure. The box crossbeam 2 is arranged on the bottom plate 102, and separates the interior of the battery pack box 1 into an electrical compartment 10 and a module compartment 20. Among them, the electrical compartment 10 is used to accommodate electrical components such as BMS and high-voltage copper busbars, and the module compartment 20 is used to accommodate battery modules.

[0037] Continue to view Figures 1 to 3As shown, in this embodiment, the end plate 4 is arranged on the box cross beam 2, and can be close to or away from the box cross beam 2. Specifically, the end plate 4 is connected to the box cross beam 2 through a tightening member 5. To ensure the positioning effect of the end plate 4 on the box cross beam 2, in this embodiment, a positioning structure is provided between the end plate 4 and the box cross beam 2, and the positioning structure is used to position the end plate 4 on the box cross beam 2.

[0038] As a preferred implementation method, Figure 3 As shown, the positioning structure of this embodiment specifically includes a positioning column provided on the end plate 4 and a positioning hole provided on the box cross beam 2, and the positioning column is located in the positioning hole. Through the cooperation of the positioning column and the positioning hole, the end plate 4 can be well positioned on the box cross beam 2, and the structure is simple and easy to design and implement.

[0039] To facilitate the installation of the jacking member 5, in this embodiment, a first connection hole 21 is provided on the box cross beam 2, and a second connection hole 41 is provided on the end plate 4. The jacking member 5 is screwed to the first connection hole 21 and the second connection hole 41 in sequence. At this time, as the jacking member 5 is screwed in, the end plate 4 is pushed and moves toward the side plate 101, that is, close to the side plate 101, so that the distance between the end plate 4 and the side plate 101 becomes smaller, and a clamping force is formed on the battery pack 3.

[0040] In specific implementation, as a preferred embodiment, a first rivet nut is fixedly connected to the box cross beam 2, and the first rivet nut is arranged corresponding to the positioning hole. A second rivet nut is also fixedly connected to the positioning column of the end plate 4. The first rivet nut, the positioning hole and the second rivet nut are coaxially arranged. At this time, the first connection hole 21 is also the first internal threaded hole on the first rivet nut, and the second connection hole 41 is also the second internal threaded hole on the second rivet nut. The top fastener 5 is preferably a bolt. In this way, the end plate 4 is connected to the box cross beam 2 by screwing the bolt with the first internal threaded hole and the second internal threaded hole.

[0041] Moreover, as the bolts are screwed in, that is, as the jacking member 5 moves, the jacking end plate 4 moves relative to the box cross beam 2 to approach the oppositely arranged side plate 101, thereby fixing the battery module between the end plate 4 and the side plate 101. It can be understood that the clamping force applied to the battery module can be adjusted by screwing in different lengths of the bolts, that is, the jacking member 5.

[0042] It is understandable that the first connecting hole 21 can also be a threaded hole directly set on the box cross beam 2, and the second connecting hole 41 can be a threaded hole directly set on the end plate 4. That is to say, the settings of the first connecting hole 21 and the second connecting hole 41 are designed separately from the above-mentioned positioning structure, which is also feasible.

[0043] See also Figure 4As shown, in this embodiment, a first heat-insulating buffer 6 is provided between two adjacent cells 31 in the cell group 3, and a second heat-insulating buffer 7 is provided between the cell group 3 and the end plate 4, and between the cell group 3 and the side plate 101. The first heat-insulating buffer 6 is filled between two adjacent cells 31, which can play a role in heat dissipation and buffering expansion, and the second heat-insulating buffer 7 is filled between the cell group 3 and the end plate 4, and between the cell group 3 and the side plate 101, which can also play a role in heat dissipation and buffering expansion.

[0044] Moreover, in a specific implementation, the first heat-insulating buffer member 6 and the second heat-insulating buffer member 7 are preferably made of foam, which has the characteristics of wide application and easy material acquisition.

[0045] It should be noted that, in addition to the first thermal insulation buffer 6 and the second thermal insulation buffer 7 in the above structure, the first thermal insulation buffer 6 can also be provided only between two adjacent battery cells 31, or the second thermal insulation buffer 7 can be provided only between the battery cell group 3 and the end plate 4, and between the battery cell group 3 and the side plate 101. It should also be noted that, in addition to using foam, the first thermal insulation buffer 6 and the second thermal insulation buffer 7 can also be made of a sheet made of silicone material.

[0046] In this embodiment, the battery module includes a plurality of battery cell groups 3 arranged in the module compartment 20, and the plurality of battery cell groups 3 are arranged side by side, and the same end of the plurality of battery cell groups 3 abuts against the end plate 4, and the other opposite end abuts against the side wall of the box. Moreover, the top fasteners 5 are also arranged in a plurality of intervals on the end plate 4 and the box cross beam 2. By tightening the top fasteners 5, i.e., bolts, thrust and tightening are formed on the end plate 4, and the plurality of battery cell groups 3 are fixed between the end plate 4 and the side plate 101 opposite to the end plate 4.

[0047] The fixing structure of the battery module of this embodiment only needs one end plate 4 to complete the fixing of the battery module into the box. In addition, the stacking of the battery modules does not require squeezing force, thereby simplifying the assembly process, improving production efficiency, reducing production costs, and having a good use effect.

[0048] Embodiment 2

[0049] This embodiment relates to a battery pack, in which the fixing structure of the battery module of Embodiment 1 is provided. The battery pack of this embodiment, by adopting the fixing structure of the battery module of Embodiment 1, can help improve the assembly efficiency of the battery pack and reduce the production cost of the battery pack.

[0050] In addition, this embodiment also relates to an energy storage device, in which the fixing mechanism of the battery module described in Embodiment 1 is provided, or the above-mentioned battery pack is provided in the energy storage device. The energy storage device of this embodiment also helps to improve the assembly efficiency of the battery pack and reduce the production cost of the battery pack by adopting the fixing structure of the battery module of Embodiment 1 or the above-mentioned battery pack.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixing structure of a battery module, wherein the battery module comprises a battery cell group formed by stacking a plurality of battery cells, characterized in that: The fixing structure includes an end plate, a side plate of the battery pack box arranged opposite to the end plate, and a tightening member; The two ends of the cell group along the cell stacking direction are respectively abutted against the end plate and the side plate, and the end plate is connected to the box crossbeam in the battery pack box through the fastening member, and the end plate can be approached to the side plate as pushed by the fastening member, thereby fixing the cell group between the end plate and the side plate.

2. The fixing structure of the battery module according to claim 1, characterized in that: A positioning structure is provided between the end plate and the box cross beam, and the positioning structure is used to position the end plate on the box cross beam.

3. The fixing structure of the battery module according to claim 2, characterized in that: The positioning structure includes a positioning column arranged on the end plate and a positioning hole arranged on the box crossbeam, and the positioning column is located in the positioning hole.

4. The fixing structure of the battery module according to claim 1, characterized in that: The box crossbeam is provided with a first connection hole, and the end plate is provided with a second connection hole; The pressing member is screwed to the first connection hole and the second connection hole in sequence, and as the pressing member is screwed in, the end plate is pushed and moves toward the side plate.

5. The fixing structure of the battery module according to claim 1, characterized in that: A first heat-insulating buffer is provided between two adjacent cells in the cell group; and / or, A second heat-insulating buffer is provided between the battery cell group and the end plate, and between the battery cell group and the side plate.

6. The fixing structure of the battery module according to claim 5, characterized in that: The first thermal insulation buffer component and / or the second thermal insulation buffer component include foam.

7. The fixing structure of the battery module according to any one of claims 1 to 6, characterized in that: The interior of the battery pack box is separated into an electrical compartment and a module compartment by the box crossbeam; The battery module includes a plurality of battery cell groups arranged in the module compartment.

8. A battery pack, characterized in that: The battery pack is provided with a fixing structure of the battery module according to any one of claims 1 to 7.

9. An energy storage device, characterized in that: The energy storage device is provided with a fixing structure of the battery module according to any one of claims 1 to 7; or, The energy storage device is provided with the battery pack described in claim 8.