A battery module

Abstract

This utility model discloses a battery module in the field of battery pack technology, including a cell assembly, a separator, side plates, and binding straps. The cell assembly includes multiple cells arranged in a rectangular array. The separator has multiple spacers 1 spaced apart in a first direction, and spacers 2 and 3 spacers at both ends in a second direction. Each spacer 1, spacer 2, and spacer 3 constitutes a positioning space for a single cell. The first direction is perpendicular to the second direction. The side plates are arranged around the periphery of the cell assembly. The binding straps are tied to the periphery of the side plates to restrain the multiple cells in the cell assembly. This utility model features rapid assembly and a simple structure, while effectively improving the assembly efficiency of the battery module and ensuring the safety and reliability of the battery module.

Description

Technical Field

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

[0002] In recent years, with the continuous development of the lithium battery energy storage industry, the application scenarios of energy storage technology have gradually covered two major areas: end-user support and energy systems. On the end-user side, this includes backup power for communication base stations, home energy storage, and data center energy storage; on the energy system side, it encompasses large-scale wind and solar integrated energy storage, grid peak-shaving energy storage, and boosting and expanding energy storage. Its application modes are also becoming increasingly diverse, mainly including grid voltage and frequency regulation, emergency power supply, power backup, transmission system stability control, load balancing regulation, new energy fluctuation mitigation, and peak shaving and valley filling, leading to rapid growth in market demand.

[0003] At the same time, the market's requirements for the structure and appearance of energy storage systems are becoming increasingly diversified. In particular, in different application fields, it is often necessary to customize the entire energy storage system from the cell level - this demand has greatly increased the manufacturing cost of energy storage systems.

[0004] Currently, significant technical challenges remain in the practical application of battery cell modules: First, cells are prone to displacement during module extrusion; second, after extrusion, individual or multiple cells may experience unexpected displacement during subsequent handling, vibration, charge / discharge cycles, or temperature changes. These issues are typical and high-risk hazards in module stacking scenarios, directly resulting in misalignment between the cell terminals and the connecting aluminum busbars. For hard connections formed by laser or ultrasonic welding, this misalignment can induce significant internal stress, leading to solder joint cracking, poor connections, and other malfunctions. Solder joint failure causes a sharp increase in contact resistance, triggering localized overheating, which can lead to fuse burnout or even fire. In severe cases, it can completely disconnect the circuit, causing the entire module to fail. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model discloses a battery module that features rapid assembly and a simple structure, while effectively improving the assembly efficiency of the battery module and ensuring its safety and reliability.

[0006] The specific technical solution of this utility model is as follows: A battery module, comprising: A battery cell assembly, comprising a plurality of battery cells arranged in a rectangular array; The middle partition has multiple partition pieces 1 spaced apart in a first direction, and partition pieces 2 and 3 spaced at both ends in a second direction. Each partition piece 1, partition piece 2, and partition piece 3 constitutes the positioning space of a single battery cell. The first direction is perpendicular to the second direction. Side plates, the side plates being disposed around the periphery of the cell assembly; and Bundling straps are attached to the periphery of the side panel to restrain multiple cells in the cell assembly.

[0007] The partition plate, partition 1, partition 2, and partition 3 can form a positioning space for the battery cell, so that when the strapping strap is binding the battery cell, the individual battery cell is always located in the positioning space of the battery cell, thereby avoiding the displacement of the battery cell causing a large deviation in the relative position with the aluminum busbar, which could lead to electrical connection failure or safety hazards.

[0008] Preferably, the side plate has a bent flange portion that engages with the battery cell assembly.

[0009] The flanged portion can fit the battery cell assembly well, so that the battery cell can work with the middle partition to ensure the restraint stability after the binding strap is tightened.

[0010] Preferably, the side plate includes two side plates arranged opposite each other, the side plates cooperating with the battery cell assembly in a third direction, the third direction being perpendicular to the first direction and perpendicular to the second direction; The flange portion of the side plate includes flange one and flange two disposed on opposite sides in the second direction, and flange one and flange two engage the battery cell in the third direction.

[0011] The first and second flanges enable the battery cell assembly to remain stable in the third direction, compensate for insufficient positioning space, and prevent the battery cell assembly from being worn by the strapping.

[0012] Preferably, the side plate one is provided with spacers four at intervals in the first direction, and the spacers four correspond to the spacers one.

[0013] This structure is simple and can effectively divide the positioning space.

[0014] Preferably, a rib is provided on one side of the side plate away from the battery cell assembly, and the rib is arranged along a first direction.

[0015] The ribs can strengthen the side plate and improve the rigidity of the battery module.

[0016] Preferably, the side plate includes two side plates two disposed opposite to each other, and the side plates two cooperate with the battery cell assembly in a first direction; The flange portion of the second side plate includes flange three and flange four arranged opposite each other in the second direction, and flange three and flange four engage the battery cell in the first direction; and / or, the flange portion of the second side plate includes flange five and / or flange six in the third direction, and flange five and / or flange six engage the battery cell in the first direction.

[0017] In the first direction, any adjacent cells are limited by the spacer. However, for the cells at both ends in the first direction, there is a limitation defect. Therefore, the second side plate can also supplement the positioning space and avoid the wear of the cell assembly caused by the strapping.

[0018] Preferably, foam 1 is attached to the side of the second side plate away from the battery cell assembly, and an end plate is provided on the side of the foam 1 away from the second side plate; The foam has the ability to deform; the strapping and the end plate work together.

[0019] Because foam has the ability to deform, it can be used to adjust the displacement of the battery cells when using strapping to restrain them, thereby improving the compactness of the battery cells.

[0020] Preferably, the end plate is provided with a positioning groove, the bottom of the positioning groove is arc-shaped, and the strapping strap cooperates with the end plate in the positioning groove.

[0021] This structure enables the proper positioning of the strapping, allowing the strapping to bind the battery cells with appropriate force, thereby meeting the stability requirements of the entire battery module.

[0022] Preferably, the projected length of the separator on the projection surface is less than the length of the battery cell on the projection surface, and the projection surface is perpendicular to the first direction.

[0023] The first spacer isolates adjacent cells in the first direction, so that each cell is located in an independent positioning space. Since the first spacer is small in size, it allows the cells to swing predictably during the binding process, thereby better fixing the cell group.

[0024] Preferably, in the first direction, a second foam with deformable capability is disposed between any adjacent cells, and the thickness of the second foam is greater than the thickness of the first spacer.

[0025] The second type of foam can achieve electrical insulation and ensure electrical safety. The second type of foam itself has the ability to deform, so it can ensure the binding stability of the strapping and can effectively absorb shock when subjected to external impact. At the same time, it can avoid potential electrical hazards caused by possible contact of the battery cells.

[0026] Compared with the prior art, this utility model can effectively avoid the unexpected displacement of the relative positions of one or more battery cells during the extrusion molding and process transfer process; at the same time, it can fully ensure the safety and reliability of the subsequent welding process, that is, by preventing the displacement of the battery cells, it can ensure that the battery cell terminals and the connecting aluminum busbars always maintain a stable relative position. Attached Figure Description

[0027] Figure 1This is a schematic diagram of an embodiment of the present utility model; Figure 2 for Figure 1 Exploded view; Figure 3 This is a schematic diagram of the partition plate in an embodiment of this utility model; Figure 4 This is a schematic diagram of side plate one in an embodiment of the present utility model; Figure 5 This is a schematic diagram of side plate two in an embodiment of the present utility model; Figure 6 for Figure 2 Enlarged view of point A; Figure 7 This is a schematic diagram of the arrangement of foam 2 in an embodiment of this utility model.

[0028] In the diagram: 1-Middle partition; 2-Bundling strap; 3-Battery cell; 4-Separator 1; 5-Separator 2; 6-Separator 3; 7-Side plate 1; 8-Side plate 2; 9-Separator 4; 10-Flange 1; 11-Flange 2; 12-Flange 3; 13-Flange 4; 14-Flange 5; 15-Rib; 16-Matching part; 17-Foam 1; 18-End plate; 19-Positioning groove; 20-Foam 2. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] like Figures 1-5 As shown, a battery module includes a cell assembly, a separator 1, side plates, and strapping 2. The cell assembly includes multiple cells 3 arranged in a rectangular array. The separator 1 has multiple spacers 4 spaced apart in a first direction, and spacers 5 and 6 spacers at both ends in a second direction. Each spacer 4, spacer 5, and spacer 6 constitutes a positioning space for a single cell 3. The first direction is perpendicular to the second direction. The side plates are arranged around the periphery of the cell assembly. The strapping 2 is tied to the periphery of the side plates to restrain the multiple cells 3 in the cell assembly.

[0031] The battery cell assembly can be configured as component one and component two. Component one and component two each have multiple battery cells 3 arranged along a first direction. Component one and component two are arranged side by side, so that all battery cells 3 are arranged in a rectangular array. Component one and component two are separated by a middle partition 1. There are multiple partitions 4. Therefore, multiple partitions 4, partitions 5, and partitions 6 can form multiple positioning spaces corresponding to the number of battery cells 3. This allows each battery cell 3 to be pre-placed in a positioning space. Then, after the side plates block all positioning spaces, it is bound and restrained by strapping 2. This structure can effectively position the battery cells 3, thereby better achieving the final fixation of the battery cells 3.

[0032] like Figure 4 and Figure 5As shown, in this embodiment, the side plate has a bent flange that engages with the battery cell assembly. Further, the side plate includes two opposing side plates 7, which engage with the battery cell assembly in a third direction, perpendicular to both the first and second directions; the side plate also includes two opposing side plates 8, which engage with the battery cell assembly in the first direction. To better separate the positioning space, the side plates 7 are spaced apart by partitions 4 and 5, corresponding to partitions 4. The two side plates 7 limit the positioning space in the third direction, and the two side plates 8 limit the positioning space in the first direction, thus ensuring that each battery cell 3 can be displaced or fixed within its predetermined positioning space. In other words, regardless of the binding result of the strapping 2 on the battery cell assembly, the battery cell 3 remains in its corresponding positioning space, ensuring that the terminal post of the battery cell 3 and the connecting aluminum busbar maintain a stable relative position during subsequent processing. Furthermore, the flange portion of the side plate 7 includes flange 10 and flange 21 arranged opposite each other in the second direction. Flanged flange 10 and flange 21 engage the battery cell 3 in the second direction. In this embodiment, the two ends of the spacer 4 9 are respectively connected to flange 10 and flange 2 11. In other embodiments, the end of the spacer 4 9 may also have a gap with the corresponding flange 10 or flange 2 11. The flange portion of the side plate 2 8 includes flange 3 12 and flange 4 13 arranged opposite each other in the second direction. Flanged flange 3 12 and flange 4 13 engage the battery cell 3 in the third direction. The flanges 10, 11, 12, and 13 enable the locking and limiting of the battery cell assembly, achieving positioning between the side plate 7, the side plate 8, and the battery cell assembly. In a preferred embodiment, the distance between flanges 10 and 11 matches the length of the battery cell 3 in the second direction, and the distance between flanges 3 and 13 matches the length of the battery cell 3 in the third direction. Matching means that they can be precisely locked onto the battery cell 3, even if there is a gap between the battery cell 3 and the corresponding flange, this gap is negligible. In different embodiments, flanges 5 and / or 6 can be optionally provided. That is, in some embodiments, the flange portion of the side plate 8 includes flanges 5 and 14 and / or 6 in the third direction, which lock the battery cell 3 in the second direction. If flanges 5 and 14 and 6 are provided simultaneously, they are positioned opposite each other. This structure results in higher structural stability. Thus, the two side plates 7 and the two side plates 8 are used to enclose the battery cell group 3, providing binding and restraint conditions for the strapping 2. As can be seen from the above, the two side plates 7 cooperate with the battery cell group in the third direction, and the two side plates 8 cooperate with the battery cell group in the first direction.It should be noted that in this embodiment, side plate 7 and side plate 8 are configured as insulating components; while in this embodiment, only one of flange 5 14 and flange 6 is provided.

[0033] Since the length of the battery cell assembly is relatively long in the first direction, in order to avoid deformation of the side plate 7 which would be detrimental to restraint, in this embodiment, a rib 15 is provided on the side of the side plate 7 away from the battery cell assembly, and the rib 15 is provided along the first direction.

[0034] Obviously, in order for side panel 7 and side panel 8 to achieve a good fit, such as Figure 4 As shown, side plate 7 and / or side plate 8 can be provided with a stepped mating part 16, or a clearance part similar to a notch, similar to the assembly of the central partition 1. This structure is actually quite conventional, so it will not be described in detail here.

[0035] like Figure 1 and Figure 2 As shown, in this embodiment, a foam 17 is provided on the side of the second side plate 8 away from the cell assembly, and an end plate 18 is provided on the side of the foam 17 away from the second side plate 8; the foam 17 has deformation capability; the binding strap 2 and the end plate 18 cooperate. The end plate 18 is mainly used for the fixed installation of the battery module as a whole in the battery system, located at both ends in the first direction, thereby connecting the second side plate 8, the foam 17, and the end plate 18 sequentially on the cell assembly, and then using the binding strap 2 to bind and restrain the cell 3. This structure can utilize the compression of the foam 17 to achieve displacement drive of the cell 3, thereby better meeting the fixing requirements. Further, as Figure 6 As shown, the end plate 18 is provided with a positioning groove 19, the bottom of which is arc-shaped. The binding strap 2 fits into the end plate 18 within the positioning groove 19. The position of the positioning groove 19 can be matched with the position of the reinforcing rib 15, thereby better achieving the positioning and binding of the binding strap 2, and thus better meeting the fixing requirements of the battery cell assembly.

[0036] like Figure 2 and Figure 7 As shown, in this embodiment, the projected length of the spacer 4 on the projection plane is less than the length of the battery cell 3 on the projection plane, and the projection plane is perpendicular to the first direction. Furthermore, in the first direction, a deformable foam 20 is disposed between any adjacent battery cells 3, and the thickness of the foam 20 is greater than the thickness of the spacer 4. It should be noted that both the foam 17 and the foam 20 have insulating properties.

[0037] For a single positioning space, the separator 4 and its adjacent foam 20 constitute one sidewall of the positioning space. Before being restrained by the strapping 2, foam 20 is in a normal state. During restraint, foam 20 is compressed, and after restraint, foam 20 remains compressed, similar to foam 17. Therefore, after restraint, in the first direction, cell 3 will be squeezed by foam 20 on both sides, or by side plate 8 and foam 20 (indirectly squeezed by foam 17). Thus, after binding with the strapping 2, the cell assembly has excellent structural compactness, ensuring that the force of the strapping 2 is applied evenly and fully to the cell assembly, thereby making the entire battery module a stable and rigid whole. Based on this, it can effectively avoid unexpected relative positional displacement between the cell 3 electrode and the connecting aluminum busbar in subsequent processes. Especially for hard connections formed by laser welding or ultrasonic welding, it can further prevent internal stress caused by positional displacement, thereby avoiding risks such as weld cracking and poor connection. It is evident that once the potential for solder joint failure is eliminated, the problem of a sharp increase in contact resistance at the connection point is also resolved, thereby effectively preventing localized overheating and thus preventing the entire module from failing. In summary, this embodiment can effectively prevent fuse blowout, fundamentally avoiding such safety risks.

[0038] Therefore, in this embodiment, the battery module adopts a rectangular array layout of two rows of multiple battery cells 3 to form a battery cell group. In the first direction, the battery cells 3 are isolated from each other by foam 20. The foam 20 has double-sided adhesive 21 and is pasted on the upper and lower positions of the battery cells 3. The foam 20 has a compression buffer function. In the middle position of the two rows of battery cells 3, the battery cells 3 are fixed and limited by the positioning surfaces on both sides of the high-strength insulating partition 1. In the third direction, the battery cell group adopts a high-strength insulating side plate 7. The side plate 7 is directly fixed to the battery cell group to enhance the structural stability. In the first direction, side plates 2 8 are installed at both ends of the battery cell assembly to protect the battery cell 3 body. Insulating tape is partially applied to the contact surface between the side plate 2 8 and the battery cell 3, and a stable connection is achieved by the tape. The outer side of the side plate 2 8 is attached and fixed to foam 17. Foam 17 is also equipped with double-sided adhesive and has compression cushioning properties. Based on this, an end plate 18 made of metal or high-strength insulating material is installed on the outer side of foam 17. Thus, by using metal or high-strength insulating material binding straps 2, which are arranged along the upper and lower positions around the battery cell assembly and embedded in the positioning grooves 19 of the end plate 18, the entire module is finally fastened into a rigid whole.

[0039] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A battery module, characterized in that, include: A battery cell assembly, comprising a plurality of battery cells arranged in a rectangular array; The middle partition has multiple partition pieces 1 spaced apart in a first direction, and partition pieces 2 and 3 spaced at both ends in a second direction. Each partition piece 1, partition piece 2, and partition piece 3 constitutes the positioning space of a single battery cell. The first direction is perpendicular to the second direction. Side plates, the side plates being disposed around the periphery of the cell assembly; and Bundling straps are attached to the periphery of the side panel to restrain multiple cells in the cell assembly.

2. A battery module as described in claim 1, characterized in that, The side plate has a bent flange that engages with the battery cell assembly.

3. A battery module as described in claim 2, characterized in that, The side plate includes two side plates arranged opposite each other. The side plate cooperates with the battery cell assembly in a third direction. The third direction is perpendicular to the first direction and perpendicular to the second direction. The flange portion of the side plate includes flange one and flange two disposed on opposite sides in the second direction, and flange one and flange two engage the battery cell in the third direction.

4. A battery module as described in claim 3, characterized in that, The side plate 1 is provided with partition 4 at intervals in the first direction, and the partition 4 corresponds to the partition 1.

5. A battery module as described in claim 3, characterized in that, A rib is provided on one side of the side plate away from the battery cell assembly, and the rib is arranged along a first direction.

6. A battery module as described in any one of claims 2 to 5, characterized in that, The side plate includes two side plates two arranged opposite to each other, and the side plates two cooperate with the battery cell assembly in a first direction; The flange portion of the second side plate includes flange three and flange four arranged opposite each other in the second direction, and flange three and flange four engage the battery cell in the first direction; and / or, the flange portion of the second side plate includes flange five and / or flange six in the third direction, and flange five and / or flange six engage the battery cell in the first direction.

7. A battery module as described in claim 6, characterized in that, A foam is attached to the side of the second side panel away from the battery cell assembly, and an end plate is provided on the side of the foam that is away from the second side panel. The foam has the ability to deform; the strapping and the end plate work together.

8. A battery module as described in claim 7, characterized in that, The end plate is provided with a positioning groove, the bottom of which is arc-shaped, and the strapping band cooperates with the end plate within the positioning groove.

9. A battery module as described in claim 1, characterized in that, The projected length of the separator on the projection surface is less than the length of the battery cell on the projection surface, and the projection surface is perpendicular to the first direction.

10. A battery module as described in claim 9, characterized in that, In the first direction, a second foam with deformable capability is disposed between any two adjacent cells, and the thickness of the second foam is greater than the thickness of the first spacer.

Images