Battery module

Abstract

The utility model discloses a battery module, include: electric core subassembly and limit component, limit component includes first limit board, second limit board, screw piece and limit band, first limit board and second limit board are opposite interval arrangement and form limit cavity, and electric core subassembly is located in limit cavity, and screw piece is connected with first limit board and second limit board respectively, and limit band is bound in the outer circumferential side of first limit board and second limit board away from battery module. Thus, through setting first limit board and second limit board cooperation screw piece, the assembly of electric core subassembly is positioned and fixed, thereby realizes to battery module and adds pre -tightening force, to improve the charge -discharge cycle performance of battery module, further, through limit band further binding fixed, can improve the inflation resistance of battery module, to prevent battery module and produce inflation force because of carrying out charge -discharge cycle, lead to battery module and appear to scatter frame etc. Problem.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module. Background Technology

[0002] A battery module is a unit that combines a certain number of individual batteries through a specific connection method and fixing structure to form an independent power supply unit. Battery modules usually come in various types, such as cylindrical cell modules, cubic cell modules, and pouch battery modules. Each type of battery module requires a corresponding assembly and fixing structure when being assembled into a group.

[0003] Taking pouch battery modules as an example, pouch batteries are prone to expansion during charging and discharging, leading to structural instability in the battery module and even damage from compression, affecting battery performance, safety, and lifespan. Traditional pouch cell module designs typically use a box-like structure. This involves arranging the cells in groups, securing them with plastic cable ties, and then placing the cell groups into the box-like structure for restraint and fixation. However, this box-like structure has several drawbacks, such as insufficient resistance to expansion and the inability to apply pre-tightening force to the battery pack, preventing the battery module from achieving optimal charge-discharge cycles. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery module that can improve the resistance to expansion and also improve the charge-discharge cycle performance.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A battery module includes: a cell assembly and a limiting assembly. The limiting assembly includes a first limiting plate, a second limiting plate, a screw connector, and a limiting band. The first limiting plate and the second limiting plate are arranged at a distance from each other to form a limiting cavity. The cell assembly is located in the limiting cavity. The screw connector is connected to the first limiting plate and the second limiting plate respectively. The limiting band is tied to the outer periphery of the first limiting plate and the second limiting plate away from the battery module.

[0007] In one embodiment, a reinforcing boss is provided on the side of the first limiting plate away from the battery cell assembly.

[0008] In one embodiment, multiple reinforcing bosses are provided, and a limiting groove is formed between two adjacent reinforcing bosses, with the limiting band located within the limiting groove.

[0009] In one embodiment, the screw is a long screw.

[0010] In one embodiment, a press-fit nut post is provided on the second limiting plate, and the long screw passes through the first limiting plate and is connected to the press-fit nut post.

[0011] In one embodiment, the limiting band is a steel band.

[0012] In one embodiment, the battery cell assembly includes a plurality of battery cell supports and a plurality of battery cells, wherein the battery cell supports are stacked and each battery cell support is provided with a battery cell receiving cavity, and each battery cell is placed in the battery cell receiving cavity.

[0013] In one embodiment, the battery cell support is provided with a clearance hole, and the screw connector passes through the clearance hole and is connected to the first limiting plate and the second limiting plate respectively.

[0014] In one embodiment, the cell assembly further includes a heat-conducting sheet that abuts against the side of the cell.

[0015] In one embodiment, the limiting component further includes a first buffer and a second buffer, the first buffer being located between the first limiting plate and the battery cell assembly, and the second buffer being located between the second limiting plate and the battery cell assembly.

[0016] In one embodiment, both the first buffer and the second buffer are cushioning foam pads.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] The battery module of this utility model uses a first limiting plate and a second limiting plate in conjunction with screw fasteners to limit and fix the assembly of the battery cell assembly, thereby applying a pre-tightening force to the battery module to improve the charge and discharge cycle performance of the battery module. In addition, the limiting band is used for further binding and fixing, which can improve the expansion resistance of the battery module to prevent excessive expansion of the battery module during charge and discharge, and thus avoid problems such as the battery module falling apart. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0020] Figure 1 This is an exploded view of the battery module in one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partially enlarged structural diagram of point A of the battery module in the diagram;

[0022] Figure 3 for Figure 1 A schematic diagram of the cell assembly structure of the battery module in the diagram; Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0024] Please see Figure 1 , Figure 2 and Figure 3 As shown, a battery module 10 includes: a cell assembly 100 and a limiting assembly 200. The limiting assembly 200 includes a first limiting plate 210, a second limiting plate 220, a screw connector 230, and a limiting band 240. The first limiting plate 210 and the second limiting plate 220 are arranged at a distance from each other to form a limiting cavity. The cell assembly 100 is located in the limiting cavity. The screw connector 230 is connected to the first limiting plate 210 and the second limiting plate 220 respectively. The limiting band 240 is tied to the outer periphery of the first limiting plate 210 and the second limiting plate 220 away from the battery module 10.

[0025] It should be noted that the first limiting plate 210 and the second limiting plate 220 form a limiting cavity for limiting and fixing the cell assembly 100. Then, the first limiting plate 210 and the second limiting plate 220 are locked and fixed by the screw connector 230, providing the necessary preload force to the cell assembly 100. This ensures that the cell assembly 100 remains tightly connected during charging and discharging, achieving better charge-discharge cycles and thus improving the charge-discharge cycle performance of the battery module 10. Furthermore, by adding a limiting band 240 to bind around the first limiting plate 210 and the second limiting plate 220, excessive expansion of the cell during charging and discharging can be further prevented, improving the anti-expansion force of the battery module 10. Furthermore, the fixing structure composed of the first limiting plate 210, the second limiting plate 220, and the screw connector 230, compared to the traditional box-shaped housing fixing structure, is not limited by size and can therefore be applied to various different cell assembly methods. For example, when the number of cells in a battery pack changes, only the size of the screw connector 230 needs to be changed. This not only improves applicability but also facilitates the assembly of the battery module 10 and improves the installation and assembly efficiency of the battery module 10.

[0026] In one embodiment, both the first limiting plate 210 and the second limiting plate 220 have a U-shaped structure, thereby ensuring the limiting effect on the battery cell assembly 100. Both the first limiting plate 210 and the second limiting plate 220 are sheet metal parts.

[0027] It should also be noted that the connection and fixation between the first limiting plate 210 and the second limiting plate 220 is achieved using a screw connector 230. That is, the first limiting plate 210 and the second limiting plate 220 are connected and locked using a threaded connection. This allows for precise control of the preload applied to the battery cell assembly 100 by rotating the screw connector 230, ensuring that the battery module 10 remains tightly connected during charge and discharge cycles. Preferably, the screw connector 230 is a long screw. In this embodiment, multiple long screws are provided, for example, three long screws, which ensures the uniformity of the locking force and improves the overall structural stability of the battery module 10, reducing the risk of deformation or loosening of the battery module 10 under external force or vibration.

[0028] Furthermore, a press-fit nut post is provided on the second limiting plate 220, and a long screw passes through the first limiting plate 210 and connects with the press-fit nut post. The press-fit nut post is located on the side of the second limiting plate 220 facing the first limiting plate 210, which is equivalent to embedding the press-fit nut post. Compared with the method of extending the long screw to the outside of the second limiting plate 220 and then locking it with a nut, the space occupied by the battery module 10 can be reduced and the space utilization rate of the battery module 10 can be improved.

[0029] In one embodiment, a reinforcing boss 211 is provided on the side of the first limiting plate 210 away from the battery cell assembly 100. This improves the mechanical strength, rigidity, and stability of the first limiting plate 210, effectively preventing deformation and twisting, and enhancing the overall structural stability of the first limiting plate 210. Similarly, a reinforcing boss 211 is also provided on the second limiting plate 220. In this embodiment, multiple reinforcing bosses 211 are provided, and a limiting groove is formed between adjacent reinforcing bosses 211. The limiting band 240 is located within the limiting groove, thus ensuring that the limiting band 240 will not slide, enhancing the fixing effect.

[0030] In one embodiment, the limiting band 240 is a steel strip. During the charge and discharge cycle, the battery module 10 generates more expansion force due to the expansion of the cell volume. Therefore, using a steel strip to bind the battery module 10 can better resist expansion and prevent the expansion force generated by the charge and discharge cycle from damaging the overall structure of the battery module 10, thus preventing the cell assembly 100 from falling apart. Meanwhile, compared to the existing method of binding with plastic straps such as plastic steel straps, which usually leaves some space when binding with plastic steel straps, the module is not subjected to pre-tightening force at the beginning of the charge and discharge cycle. As the charge and discharge cycle continues, the volume of the battery increases and it gradually becomes subject to the compressive force generated by the plastic steel strap binding. As the plastic steel strap changes over time, the material of the plastic steel strap will gradually become brittle and will automatically break when it reaches a certain level. In this embodiment, steel straps are used for binding, which not only avoids the problem of brittleness and breakage, but also applies the required pre-tightening force to the cell assembly 100 in conjunction with the first limiting plate 210, the second limiting plate 220 and the screw connector 230, thereby improving the charge and discharge cycle performance of the battery module 10.

[0031] In one embodiment, the battery cell assembly 100 includes multiple battery cell supports 110 and multiple battery cells 120. The battery cell supports 110 are stacked, and each battery cell support 110 is provided with a battery cell receiving cavity 111, in which each battery cell 120 is placed. Thus, by providing the battery cell supports 110, the protection of the battery cells can be improved. In this embodiment, positioning posts 112 and positioning grooves 113 are respectively provided on both sides of the battery cell supports 110. When the battery cell supports 110 are stacked, the positioning post 112 of one battery cell support 110 is inserted into the positioning groove 113 of the adjacent battery cell support 110, thereby limiting and fixing the battery cell support 110, and facilitating the assembly of the battery cell assembly 100, improving assembly efficiency and assembly accuracy. In this embodiment, four sets of positioning posts 112 and positioning grooves 113 are provided and are respectively located at the four corners of the cell support 110, thereby improving the overall structural stability of the cell assembly 100.

[0032] In one embodiment, the battery cell support 110 is also provided with a tab clearance hole 115, which is connected to the battery cell housing cavity 111, and the tabs on two adjacent batteries are connected through the tab clearance hole 115.

[0033] In one embodiment, the battery cell support 110 is provided with a clearance hole 114, and the screw connector 230 passes through the clearance hole 114 and is connected to the first limiting plate 210 and the second limiting plate 220 respectively.

[0034] It should be noted that the screw connector 230 connects the first limiting plate 210, the second limiting plate 220, and each cell bracket 110 through the clearance hole 114 on the cell bracket 110 to form a stable overall structure, thereby improving the overall stability of the battery module 10. At the same time, in this embodiment, the clearance hole 114 is located between the two cell receiving cavities 111, that is, the clearance hole 114 is located in the area near the center line of the cell bracket 110. In this way, the preload applied by the first limiting plate 210 and the second limiting plate 220 to the cell assembly 100 can be relatively evenly distributed, avoiding excessive or insufficient local stress, thereby improving the overall stability of the battery module 10. In addition, the clearance hole 114 provided on the cell bracket 110 allows the screw 230 to quickly pass through the cell bracket 110 and connect with the first limiting plate 210 and the second limiting plate 220, which simplifies the assembly process of the battery module 10, and also improves the positioning accuracy and reduces the error and adjustment time during the assembly process.

[0035] In one embodiment, the battery cell assembly 100 further includes a heat-conducting sheet 130, which abuts against the side of the battery cell. The heat-conducting sheet 130 can rapidly conduct and dissipate the heat generated by the battery cell during charging and discharging, thereby improving the thermal conductivity of the battery module 10, enhancing its thermal management effect, and ultimately improving its performance, safety, and lifespan. For example, the heat-conducting sheet 130 can be made of graphite, copper foil, or composite materials.

[0036] In one embodiment, the limiting component 200 further includes a first buffer 250 and a second buffer 260. The first buffer 250 is located between the first limiting plate 210 and the cell assembly 100, and the second buffer 260 is located between the second limiting plate 220 and the cell assembly 100. The first buffer 250 and the second buffer 260 indirectly apply a pre-tightening force, and can also absorb and alleviate the expansion force generated by the battery module 10 during charging and discharging to a certain extent, preventing excessive expansion of the cell and damage to the battery module 10 structure. Furthermore, during the use of the battery module 10, the first buffer 250 and the second buffer 260 can absorb externally applied vibrations and impacts, protecting the cell from mechanical damage and improving shock resistance. Further, by providing the first buffer 250 and the second buffer 260, the gap between the limiting plate and the cell assembly 100 can be filled, thereby preventing the cell from loosening or shifting during charging and discharging. Preferably, both the first buffer 250 and the second buffer 260 are cushioning foam pads. In addition, in this embodiment, both the first buffer member 250 and the second buffer member 260 are provided with through holes so that the screw connector 230 can pass through the through holes to connect the first limiting plate 210 and the second limiting plate 220 on both sides.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery module, characterized in that, include: Battery cell assembly; and A limiting component includes a first limiting plate, a second limiting plate, a screw connector, and a limiting band. The first limiting plate and the second limiting plate are arranged at a distance from each other to form a limiting cavity. The battery cell assembly is located in the limiting cavity. The screw connector is connected to the first limiting plate and the second limiting plate respectively. The limiting band is tied to the outer periphery of the first limiting plate and the second limiting plate away from the battery module.

2. The battery module according to claim 1, characterized in that, A reinforcing boss is provided on the side of the first limiting plate away from the battery cell assembly.

3. The battery module according to claim 2, characterized in that, The reinforcing boss is provided in multiple ways, and a limiting groove is formed between two adjacent reinforcing bosses, with the limiting band located within the limiting groove.

4. The battery module according to claim 3, characterized in that, The screw connector is a long screw.

5. The battery module according to claim 4, characterized in that, The second limiting plate is provided with a press-fit nut post, and the long screw passes through the first limiting plate and is connected to the press-fit nut post.

6. The battery module according to claim 1, characterized in that, The limiting band is a steel strip.

7. The battery module according to any one of claims 1-6, characterized in that, The battery cell assembly includes multiple battery cell supports and multiple battery cells. The battery cell supports are stacked and each battery cell support is provided with a battery cell receiving cavity, and each battery cell is placed in the battery cell receiving cavity.

8. The battery module according to claim 7, characterized in that, The battery cell support is provided with clearance holes, and the screw connector passes through the clearance holes and is connected to the first limiting plate and the second limiting plate respectively.

9. The battery module according to claim 7, characterized in that, The battery cell assembly also includes a heat-conducting sheet, which abuts against and contacts the side of the battery cell.

10. The battery module according to any one of claims 1-6, characterized in that, The limiting component further includes a first buffer and a second buffer, wherein the first buffer is located between the first limiting plate and the battery cell assembly, and the second buffer is located between the second limiting plate and the battery cell assembly.

11. The battery module according to claim 10, characterized in that, Both the first and second buffer components are cushioning foam pads.

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