Battery module expansion pre-tightening structure

Abstract

The utility model relates to lithium ion battery technical field, concretely provides a kind of battery module expansion pre-tightening structure for pre-tightening to battery module, including mounting bracket, pressure plate, drive assembly and reset component;Wherein, mounting bracket has a bottom plate, and battery module is set on the surface of bottom plate;Pressure plate is slidably installed on mounting bracket, and it is located at the side of battery module away from bottom plate;Drive assembly is set on the side of mounting bracket away from bottom plate, and drive assembly is connected with pressure plate by reset component, and provides sliding driving force for pressure plate.The utility model effectively solves the problem that battery module is unevenly stressed, resulting in excessive or insufficient stress on some battery cells, and the electrical performance of battery module cannot be fully utilized by using fasteners to apply pre-tightening force to battery module.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically providing a battery module expansion pre-tightening structure. Background Technology

[0002] A lithium battery consists of a set of positive and negative electrodes, a separator, and an electrolyte. However, the output voltage and current density of a single cell are relatively low when it is working. In order to obtain high voltage and power, multiple single cells are usually connected in series to form a battery module. Adjacent single cells are separated by bipolar plates, and the battery stack is installed in a circular or rectangular pressure device.

[0003] The battery module is in a sealed environment. During use, gas is generated inside the lithium battery, causing individual lithium batteries to expand during charging and contract during discharging. In order to fully utilize the charging and discharging performance of the cells, a preload force must be applied to the battery module or individual cells.

[0004] The current method of applying preload to battery modules involves setting multiple fasteners and fine-tuning them to achieve uniform force distribution on the cell surface. However, the equipment used in existing technologies is relatively simple, and the micro-control precision of the fasteners is limited, making it difficult to achieve uniform force distribution. This results in some cells experiencing excessive or insufficient force, preventing the battery module from fully realizing its electrical performance. Utility Model Content

[0005] This utility model provides a battery module expansion pre-tightening structure, which solves the problem in the prior art that the battery module is subjected to uneven force when applying pre-tightening force to the battery module using fasteners, resulting in some cells being subjected to excessive or insufficient force, and the battery module's electrical performance not being fully utilized.

[0006] This utility model provides a battery module expansion pre-tightening structure, including: a mounting frame, a pressure plate, a driving assembly, and a reset assembly; wherein, the mounting frame has a base plate, and the battery module is disposed on the surface of the base plate; the pressure plate is slidably mounted on the mounting frame and is located on the side of the battery module away from the base plate; the driving assembly is disposed on the side of the mounting frame away from the base plate, and the driving assembly is connected to the pressure plate through the reset assembly, and provides a sliding driving force for the pressure plate.

[0007] Optionally, the drive assembly includes: a housing, a movable plate, an airbag, and a blower; wherein, the housing is mounted on the end of the mounting bracket away from the base plate and located on the side of the pressure plate opposite to the battery module; the movable plate is slidably mounted in the housing in a direction perpendicular to the pressure plate; the airbag is disposed in the housing and located on the side of the movable plate opposite to the pressure plate; the blower is disposed on the outer wall of the housing and communicates with the airbag.

[0008] Optionally, the reset assembly includes: a connecting rod, a limiting plate, and an elastic element; wherein, at least one connecting rod is provided, one end of the connecting rod is connected to the movable plate, and the other end is connected to the pressure plate; the limiting plate is fixedly connected to the inner sidewall of the housing and is located between the movable plate and the pressure plate; the elastic element is sleeved on the connecting rod, and one end of the elastic element abuts against the movable plate, and the other end abuts against the limiting plate; a through hole is provided on the surface of the limiting plate, and the connecting rod passes through the through hole.

[0009] Optionally, the battery module includes: individual battery cells and an elastic plate; wherein, the plurality of individual battery cells are disposed on the base plate and are stacked; the elastic plate is disposed between two adjacent individual battery cells; the elastic plate is a silicone plate.

[0010] Optionally, the inner wall of the housing is provided with a sliding groove, and the movable plate is provided with a slider that is adapted to the sliding groove.

[0011] Optionally, a pressure sensing plate is provided between the battery module and the pressure plate.

[0012] Optionally, the mounting frame includes: uprights and epoxy board; wherein, the plurality of uprights are vertically arranged on the base plate and symmetrically arranged along the length direction of the individual battery cell; An epoxy board is disposed between two adjacent uprights along the width direction of the individual battery cell; The upright has a limiting groove, and the epoxy board is installed in the limiting groove.

[0013] Optionally, the epoxy board has multiple slots, and each individual battery cell extends into the corresponding slot.

[0014] Optionally, the pressure plate and / or the base plate are aluminum alloy plates.

[0015] Optionally, the pressure plate and / or the base plate are provided with a plurality of through holes.

[0016] This utility model provides a battery module expansion pre-tightening structure. By adding an adjustable drive component to a traditional pre-tightening structure, the pre-tightening force on the battery module can be adjusted. This effectively solves the problem in existing technologies where fasteners are used to apply pre-tightening force to the battery module, resulting in uneven force on the battery module, causing some cells to experience excessive or insufficient force, and preventing the battery module from fully utilizing its electrical performance. Specifically: The pressure plate and mounting bracket provide an initial preload to the battery module. The drive assembly can compress the pressure plate, thereby adjusting the initial preload and maximizing the battery module's discharge performance. The reset assembly allows for adjustment and reset of the drive assembly, reducing the pressure exerted on the pressure plate and maximizing the battery module's charging performance.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the disassembled battery module expansion pre-tightening structure provided by this utility model; Figure 2 This is a three-dimensional structural diagram of the battery module pre-tightening structure provided by this utility model from a first-view perspective; Figure 3 This is a two-dimensional structural diagram of the battery module pre-tightening structure provided by this utility model from a second perspective. Figure 4 This is a schematic diagram of the longitudinally cut oblique three-dimensional structure of the battery module pre-tightening structure provided by this utility model; Figure 5 This is a three-dimensional structural diagram of the disassembled pre-tightening structure drive assembly provided by this utility model; Figure 6 This is a schematic diagram of the longitudinally sliced ​​three-dimensional structure of the pre-tightening structure provided by this utility model; Figure 7 This is a three-dimensional structural diagram of the expansion pre-tightening structure provided by this utility model from a third-view perspective; Figure 8 This is a three-dimensional structural diagram of the battery module provided by this utility model; Figure 9 This is a three-dimensional structural diagram of the pre-tightening structure reset assembly provided by this utility model; Figure 10 This is a top-view three-dimensional structural diagram of the pre-tightening structure provided by this utility model, showing a transverse planing process. Figure 11 yes Figure 10 Enlarged view at point A; Figure 12 This is a three-dimensional structural disassembly diagram of the pre-tightening structure provided by this utility model.

[0020] Figure label: 1. Battery module; 101. Single cell; 102. Elastic plate; 2. Mounting bracket; 201. Base plate; 202. Upright pole; 203. Epoxy board; 2031. Slot; 204. Limiting slot; 3. Pressure plate; 301. Through hole; 4. Drive assembly; 401. Housing; 4011. Slide groove; 4012. Slider; 402. Movable plate; 403. Airbag; 404. Blower; 5. Reset assembly; 501. Connecting rod; 502. Limiting plate; 503. Elastic element; 6. Pressure sensing plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., 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 embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0024] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The following is combined with Figures 1 to 12 The embodiments shown illustrate the technical solution of this utility model: This utility model embodiment provides a battery module expansion pre-tightening structure for pre-tightening the battery module 1, such as... Figures 1 to 4 As shown, the battery module expansion pre-tightening structure may include: mounting bracket 2, pressure plate 3, drive assembly 4, and reset assembly 5; The mounting bracket 2 has a base plate 201, and the battery module 1 is disposed on the surface of the base plate 201; the pressure plate 3 is slidably mounted on the mounting bracket 2 and is located on the side of the battery module 1 away from the base plate 201; the drive assembly 4 is disposed on the side of the mounting bracket 2 away from the base plate 201, and the drive assembly 4 is connected to the pressure plate 3 through the reset assembly 5 to provide sliding driving force for the pressure plate 3.

[0027] In some embodiments, the shape of the pressure plate 3 can be a rectangle, a rounded rectangle, a square, or a regular polygon, etc., which can be used by the drive component 4 to give the battery module 1 an initial preload. In this embodiment, as shown in the figure, the pressure plate 3 is preferably square in shape. The pressure plate 3 is placed on the side of the battery module 1 away from the base plate 201 by the mounting bracket 2, so as to give the battery module 1 an initial preload. The drive component 4 can adjust the magnitude of the preload given to the battery module 1 by the pressure plate 3, thereby achieving the effect of changing the initial preload. The reset component 5 is disposed between the pressure plate 3 and the drive component 4, and is used to reset the drive component 4 to reduce the preload applied to the battery module 1.

[0028] The battery module expansion pre-tightening structure provided in this embodiment of the utility model, by adding an adjustable drive component 4 to the traditional pre-tightening structure, makes the pre-tightening force on the battery module 1 adjustable. This effectively solves the problem in the prior art where the battery module 1 is subjected to uneven force when applying pre-tightening force using fasteners, resulting in some cells experiencing excessive or insufficient force and the battery module 1's electrical performance not being fully utilized. Specifically: The pressure plate 3 and mounting bracket 2 provide an initial preload to the battery module 1. The drive assembly 4 can compress the pressure plate 3, thereby adjusting the initial preload of the battery module 1 and maximizing its discharge performance. The reset assembly 5 can adjust the drive assembly 4 to reset it, thereby reducing the pressure exerted by the drive assembly 4 on the pressure plate 3 and maximizing the charging performance of the battery module 1.

[0029] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 , Figure 5 and Figure 6 As shown, the drive assembly 4 may include: a housing 401, a movable plate 402, an airbag 403, and a blower 404; The housing 401 is mounted on the mounting bracket 2 at one end away from the base plate 201 and is located on the side of the pressure plate 3 away from the battery module 1; the movable plate 402 is slidably mounted inside the housing 401 in a direction perpendicular to the pressure plate 3; the airbag 403 is located inside the housing 401 and is located on the side of the movable plate 402 away from the pressure plate 3; the blower 404 is located on the outer wall of the housing 401 and is connected to the airbag 403.

[0030] In some embodiments, the movable plate 402 can be a rectangle, square, regular polygon, etc., which can enable the blower 404 to inflate the airbag 403, so that the airbag 403 squeezes the movable plate 402, and the movable plate 402 drives the reset component 5 to squeeze the pressure plate 3, so that the pressure plate 3 further compresses the battery module 1, thereby changing the initial preload of the battery module 1. In this embodiment, the housing 401 is provided with an airbag 403, a movable plate 402, and a reset assembly 5. The airbag 403 abuts against the movable plate 402. When the battery module 1 discharges, the blower 404 is adjusted to be in inflation mode, inflating the airbag 403. The housing 401 can constrain the expansion of the airbag 403, causing it to deform axially towards the movable plate 402. The airbag 403 drives the movable plate 402 to move towards the pressure plate 3. The reset assembly 5 causes the movable plate 402 to drive the pressure plate 3 towards the battery. The direction of module 1 moves, thereby compressing battery module 1 and allowing battery module 1 to fully perform its discharge performance. When battery module 1 is charging, the blower 404 is adjusted to the air extraction mode to extract the air from the airbag 403, reducing the pressure on the reset component 5. The reset component 5 drives the movable plate 402 away from the pressure plate 3, so that when battery module 1 expands, the movable pressure plate 3 applies only a small pressure to battery module 1, allowing sufficient space for the gas generated by battery module 1 to expand and allowing battery module 1 to fully perform its charging performance.

[0031] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 and Figure 9 As shown, the reset assembly 5 may include: a connecting rod 501, a limiting plate 502, and an elastic element 503; Among them, at least one connecting rod 501 is provided, one end of the connecting rod 501 is connected to the movable plate 402, and the other end is connected to the pressure plate 3; the limiting plate 502 is fixedly connected to the inner side wall of the housing 401 and is located between the movable plate 402 and the pressure plate 3; the elastic element 503 is sleeved on the connecting rod 501, and one end of the elastic element 503 abuts against the movable plate 402, and the other end abuts against the limiting plate 502; The limiting plate 502 has a through hole on its surface, through which the connecting rod 501 passes.

[0032] In some embodiments, the elastic element 503 can be a metal spring or a non-metallic composite spring, and multiple connecting rods 501 can be provided to enable the driving force on the driving assembly 4 to be transmitted to the pressure plate 3. In this embodiment, the elastic element 503 is sleeved on the connecting rod 501. One end of the connecting rod 501 abuts against the pressure plate 3, and the other end abuts against the movable plate 402. When the battery module 1 is discharging, the driving component 4 drives the connecting rod 501 to move towards the pressure plate 3, further squeezing the battery module 1, thereby increasing the pre-tightening force of the battery module 1 and fully utilizing the battery's discharge performance. When the battery module 1 is charging, the blower 404 is adjusted to be in the suction mode to extract the gas from the airbag 403, reducing the pressure on the elastic element 503. Through the setting of the limiting plate 502, the elastic force of the elastic element 503 acts in the opposite direction on the movable plate 402, causing the movable plate 402 to move upward, thereby reducing the pressure on the battery module 1 and fully utilizing the charging performance of the battery module 1.

[0033] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 and Figure 7 As shown, the battery module 1 may include: a single battery cell 101 and a flexible plate 102; Multiple individual battery cells 101 are disposed on the base plate 201, and the multiple individual battery cells 101 are stacked; an elastic plate 102 is disposed between two adjacent individual battery cells 101; the elastic plate 102 is a silicone plate.

[0034] In some embodiments, the elastic plate 102 can be a rubber-like material, and its shape can be rectangular, square, circular or regular polygonal, as long as it can provide elasticity between individual battery cells 101. In this embodiment, multiple individual battery cells 101 are stacked and arranged on the base plate 201 to form a large battery pack. The elastic plate 102 provides elasticity between the individual battery cells 101, which can transmit the pressure on the pressure plate 3 to the individual battery cells 101, thereby ensuring that each individual battery cell 101 is compressed and the electrical performance of the battery module 1 is fully utilized. The elastic plate 102 is preferably a silicone plate, which has better deformation recovery ability. When the battery module 1 is charging, the individual battery cells 101 expand and compress the elastic plate 102, which can transmit the compressive force between the individual battery cells 101. At the same time, it can compress itself to a greater extent, so that there is more expansion space between the individual battery cells 101. When the battery module 1 is discharging, the individual battery cells 101 contract. At this time, the force on the elastic plate 102 decreases. Relying on its own recovery ability, it can compress the individual battery cells 101 and make its discharge performance fully utilized.

[0035] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figures 10 to 11 As shown, a sliding groove 4011 is provided on the inner side wall of the housing 401, and a slider 4012 adapted to the sliding groove 4011 is provided on the movable plate 402.

[0036] In this embodiment, a groove 4011 is provided on the inner side wall of the housing 401, which meshes with the slider 4012 on the movable plate 402. The airbag 403 is inflated by the blower 404, causing the airbag 403 to expand and deform, which drives the movable plate 402 and the slider 4012 on the movable plate 402 to move along the groove 4011 on the housing 401 toward the pressure plate 3, thereby changing the preload of the battery module 1. Through the design of the groove 4011 and the slider 4012, the thrust generated by the deformation of the airbag 403 can easily drive the movable plate 402 to move.

[0037] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 , Figure 9 and Figure 12 As shown, a pressure sensing plate 6 is provided between the battery module 1 and the pressure plate 3.

[0038] In some embodiments, the pressure sensing sheet 6 can be rectangular, square, circular, regular polygonal, etc., and is disposed between individual battery cells 101, which can detect the pressure between the pressure plate 3 and the battery module 1. In this embodiment, the pressure sensor 6 is disposed between the battery module 1 and the pressure plate 3. The pressure sensor 6 can detect the change in the initial preload between the pressure plate 3 and the battery module 1 when the battery module 1 is charging and discharging, thereby adjusting the state of the blower 404, causing the drive assembly 4 and the reset assembly 5 to operate, changing the pressure between the pressure plate 3 and the battery module 1, and thus changing the preload on the battery module 1, so that the electrical performance of the battery module 1 can be fully utilized.

[0039] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 and Figure 12 As shown, the mounting bracket 2 may include: a pole 202 and an epoxy board 203; Multiple uprights 202 are vertically arranged on the base plate 201 and symmetrically arranged along the length direction of the individual battery cell 101; epoxy board 203 is arranged between two adjacent uprights 202 along the width direction of the individual battery cell 101; a limiting groove 204 is opened on the upright 202, and the epoxy board 203 is installed in the limiting groove 204.

[0040] In this embodiment, the upright 202 is used to initially install and fix the individual battery cells 101, preventing them from tipping over. The epoxy plate 203 ensures that the compressive force generated by the expansion of the individual battery cells 101 during charging is mostly applied between the individual battery cells 101, allowing the battery module 1 to fully utilize its charging and discharging performance. The limiting groove 204 on the mounting bracket 2 is used to further install and fix the individual battery cells 101. The epoxy plate 203 is placed within the limiting groove 204. During the use of the individual battery cells 101, the gas expansion force generated inside the individual battery cells 101 occurs to the maximum extent along the axial direction of the battery module 1. This allows the preload of the pressure plate 3 to be adjusted by the drive component 4, ensuring that the electrical performance of the individual battery cells 101 is fully utilized.

[0041] According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 , Figure 8 and Figure 12 As shown, the epoxy board 203 has multiple slots 2031, and each individual battery cell 101 extends into the corresponding slot 2031.

[0042] In this embodiment, the individual battery cells 101 can be stacked through the slots 2031 on the epoxy board 203, so that there is an expansion space between the individual battery cells 101, ensuring that the individual battery cells 101 have enough space to expand when the battery module 1 is charging, so that the battery module 1 can work normally. According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 and Figure 12 As shown, the pressure plate 3 and / or the base plate 201 are aluminum alloy plates.

[0043] In this embodiment, the pressure plate 3 is preferably an aluminum alloy plate, or the base plate 201 is preferably an aluminum alloy plate, or both the pressure plate 3 and the base plate 201 are aluminum alloy plates. Aluminum alloy plates are cheaper and lighter. Compared with aluminum materials, aluminum alloys have stronger hardness and are less prone to damage. According to the battery module expansion pre-tightening structure provided in the embodiments of this utility model, such as Figure 1 and Figure 12 As shown, the pressure plate 3 and / or the base plate 201 have multiple through holes 301.

[0044] In this embodiment, a through hole 301 is provided on the pressure plate 3, or a through hole 301 is provided on the bottom 201, or both the pressure plate 3 and the bottom plate 201 are provided with through holes 301, so that the pressure plate 3 and the bottom plate 201 are lighter and can also have a heat dissipation effect.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery module expansion pre-tightening structure for pre-tightening a battery module, characterized by, include: The mounting bracket has a base plate, and the battery module is disposed on the surface of the base plate; A pressure plate is slidably mounted on the mounting bracket and located on the side of the battery module away from the base plate; A drive assembly is disposed on the side of the mounting bracket away from the base plate, and the drive assembly is connected to the pressure plate through a reset assembly and provides sliding drive force to the pressure plate.

2. The battery module expansion pre-tightening structure according to claim 1, characterized by, The driving component includes: The housing is mounted on the end of the mounting bracket away from the base plate and is located on the side of the pressure plate opposite to the battery module; A movable plate is slidably installed inside the housing in a direction perpendicular to the pressure plate; An airbag is disposed within the housing and located on the side of the movable plate opposite to the pressure plate; A blower is located on the outer wall of the housing and is in communication with the airbag.

3. The battery module expansion pre-tightening structure according to claim 2, characterized by, The reset component includes: At least one connecting rod is provided, with one end of the connecting rod connected to the movable plate and the other end connected to the pressure plate; A limiting plate is fixedly connected to the inner wall of the housing and is located between the movable plate and the pressure plate; An elastic element is sleeved on the connecting rod, with one end of the elastic element abutting against the movable plate and the other end abutting against the limiting plate; The limiting plate has a through hole on its surface, and the connecting rod passes through the through hole.

4. The battery module expansion pre-tightening structure according to claim 1, characterized by, The battery module includes: Multiple individual battery cells are disposed on the base plate, and the multiple individual battery cells are stacked in layers; An elastic plate is disposed between two adjacent individual battery cells; The elastic plate is a silicone plate.

5. The battery module expansion pre-tension structure according to claim 2, wherein The inner wall of the housing is provided with a sliding groove, and the movable plate is provided with a slider that is adapted to the sliding groove.

6. The battery module expansion pre-tension structure according to claim 1, wherein A pressure sensing plate is provided between the battery module and the pressure plate.

7. The battery module expansion pre-tension structure according to claim 4, characterized by, The mounting bracket includes: Multiple uprights are vertically mounted on the base plate and symmetrically arranged along the length of the individual battery cell; An epoxy board is disposed between two adjacent uprights along the width direction of the individual battery cell; The upright has a limiting groove, and the epoxy board is installed in the limiting groove.

8. The battery module expansion pre-tension structure according to claim 7, characterized by, The epoxy board has multiple slots, and each individual battery cell extends into the corresponding slot.

9. The battery module expansion pre-tension structure according to claim 1, wherein The pressure plate and / or the base plate are made of aluminum alloy.

10. The battery module expansion pre-tension structure according to claim 9, characterized by, The pressure plate and / or the base plate have multiple through holes.

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