Tensioning assembly of battery, battery pack and assembling method of battery

Abstract

The invention provides a tensioning assembly of a battery, a battery pack and an assembling method of the battery, and the tensioning assembly comprises a driving device and a horizontal moving device; the driving device is connected with the horizontal moving device and used for driving the moving part of the horizontal moving device to move horizontally, and the horizontal moving device is used for providing force in the horizontal direction for the battery module. The battery pack has the beneficial effects that the battery module can be directly arranged between the battery accommodating cavities, the battery module does not need to be assembled after being arranged into a module, the assembly process of the battery pack is saved, in addition, a process structure for forming the module is saved, the internal space of the battery pack is saved, the overall space utilization rate of the battery pack is improved, and the production cost is reduced. And thus, the energy capacity of the battery pack in unit volume is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a battery tensioning assembly, a battery pack, and a battery assembly method. Background Art

[0002] With the vigorous development of the new energy industry, the battery module system has attracted much attention as a core component of new energy vehicles. Consumers have put forward further demands on the safety, low cost, high energy density, and high grouping efficiency of the battery module system. At present, the new energy battery module adopts a structural method in which the battery module monomers are assembled into modules and then installed and fastened on the box. The battery module monomers are stacked into modules, and the modules are wrapped with shells and end plates. The shells and end plates are defined by fixtures and assembled by bolts or welding processes. The pre-tightening force is applied to the battery cells by the expansion force of the foam. The modules, shells and end plates form a module, and the modules are placed and fixed in the battery pack box. However, this method increases the process of assembling modules into modules, which is more complicated. At the same time, the assembled modules are placed in the battery pack box, and the structure will occupy a part of the space for bolting and fastening, which affects the volume utilization and grouping efficiency of the entire battery module, and affects the energy of the battery module system. Summary of the Invention

[0003] The main purpose of the present invention is to provide a battery tensioning assembly, a battery pack and a battery assembly method, aiming to solve the problem of complex assembly process of traditional battery packs.

[0004] The present invention provides a battery tensioning assembly for fixing a battery module, comprising: a driving device and a horizontal moving device;

[0005] The driving device is connected to the horizontal moving device and is used to drive the moving part of the horizontal moving device to move horizontally. The horizontal moving device is used to provide a horizontal clamping force to the battery module.

[0006] Furthermore, the horizontal moving device further comprises a vertical moving beam and a guide device, and the moving portion is a horizontal moving beam;

[0007] The driving device is connected to the vertical moving beam and is used to apply a vertical force to move the vertical moving beam in the vertical direction. The horizontal moving beam is provided with a first inclined surface on a side close to the vertical moving beam. The vertical moving beam is in contact with and connected to the first inclined surface of the horizontal moving beam. The guide device is slidably connected to the horizontal moving beam so that the horizontal moving beam moves horizontally on the guide device.

[0008] Furthermore, the driving device is a pressing block, which is connected to the vertical moving beam and applies a vertical force to move the vertical moving beam in the vertical direction.

[0009] Furthermore, the driving device is a tensioning bolt, which is sleeved on the vertical moving beam and applies vertical force to the vertical moving beam through the bolt head of the tensioning bolt, so that the vertical moving beam moves in the vertical direction. The side of the tensioning bolt away from the bolt head is fixedly connected to the bottom plate of the box body that accommodates the battery module.

[0010] Furthermore, it also includes a fixing beam, which is fixed on the bottom plate of the box body accommodating the battery module, and the tensioning bolt is fixedly connected to the bottom plate of the box body of the battery module by connecting the fixing beam.

[0011] Furthermore, an inclined structure is provided on a side of the vertical moving beam close to the horizontal moving beam, and the first inclined surface is in contact with and connected to the inclined structure.

[0012] Furthermore, the inclination angle of the first inclined surface is the same as the inclination angle of the inclined structure, and the first inclined surface fits the inclined structure.

[0013] Furthermore, at least one cavity is provided on the vertical moving beam and / or the horizontal moving beam.

[0014] Furthermore, the shape of the vertical movable beam is any one of a pyramid, a truncated pyramid, a cone, and a truncated cone.

[0015] Furthermore, the horizontal moving beams include two, which are mirror-imaged and arranged on both sides of the vertical moving beam and are respectively in contact with and connected to the vertical moving beam.

[0016] Furthermore, the guide device is a guide shaft or a guide rib.

[0017] Furthermore, a first limiting structure is provided on the side of the vertical moving beam close to the horizontal moving beam, and a second limiting structure is provided on the side of the horizontal moving beam close to the vertical moving beam. When the vertical moving beam moves up and down, the vertical moving beam is limited by the contact between the first limiting structure and the second limiting structure.

[0018] The present invention also provides a battery pack, comprising: a battery module, a box body, and the above-mentioned battery tensioning assembly;

[0019] The horizontal movement device is arranged between the battery accommodating cavities and is in contact with and connected to the battery modules;

[0020] The box body is provided with a plurality of battery accommodating cavities, the battery modules are arranged in the battery accommodating cavities and are in contact with and connected to the cavity wall of the battery accommodating cavities on a side away from the horizontal moving device.

[0021] Furthermore, the cavity wall is a reinforcement beam.

[0022] Furthermore, the guide device is a guide rib;

[0023] The guide rib is fixed on the cavity wall of the battery accommodating cavity.

[0024] Furthermore, it also includes: a battery module cover, the battery module is arranged in the battery accommodating cavity, and the battery module cover is connected to the box body and is used to cover the battery accommodating cavity.

[0025] Furthermore, the box body includes an upper cover and a lower cover, the battery accommodating cavity is arranged in the lower cover, and the upper cover is used to cover the lower cover.

[0026] Furthermore, it also includes a heat conducting plate, which is arranged in the battery accommodating cavity and between the battery module and the box body, and is in contact with and connected to the battery module.

[0027] The present invention also provides a battery assembly method, comprising:

[0028] Place the battery module in the battery receiving cavity of the box body;

[0029] A tensioning assembly for placing a battery between the battery receiving cavities;

[0030] activating a driving device in the battery tensioning assembly to move the horizontal moving device toward the battery module;

[0031] When the vertical movable beam moves to the point where its first limiting structure contacts the second limiting structure of the horizontal movable beam, the clamping assembly of the battery module is completed.

[0032] The beneficial effects of the present invention are as follows: horizontal tension is provided to the battery module through the tensioning module, and a pre-tightening force is applied to the battery module together with the cavity wall of the battery accommodating cavity, so that the battery module can be directly loaded into the battery accommodating cavity without the need to arrange the battery module into a module and then assemble it, thus saving the assembly process of the battery pack. In addition, the process structure brought about by the assembly of the module is saved, thereby saving the space inside the battery pack, improving the overall space utilization of the battery pack, and thereby improving the energy capacity per unit volume of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a tensioning assembly of a battery according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

[0035] Figure 3 is a structural cross-sectional view of a battery pack according to an embodiment of the present invention;

[0036] Figure 4 This is a partial structural diagram of a battery module according to an embodiment of the present invention;

[0037] Figure 5 yes Figure 4 Schematic diagram of the structural explosion;

[0038] Figure 6 is a structural schematic diagram of a tensioning module of a battery module according to an embodiment of the present invention;

[0039] Figure 7 This is a schematic exploded view of the structure of a tensioning module of a battery module according to one embodiment of the present invention;

[0040] Figure 8 is a structural cross-sectional view of a tensioning module of a battery module according to an embodiment of the present invention;

[0041] Figure 9 yes Figure 8 Schematic diagram of the structural explosion;

[0042] Figure 10 is a schematic cross-sectional view of the structure of a tensioning module of a battery module according to an embodiment of the present invention;

[0043] Figure 11 yes Figure 10 Schematic diagram of the structural explosion.

[0044] Figure 1-11 middle:

[0045] 1. Box body; 2. Tensioning module; 11. Reinforcement beam; 12. Battery accommodating cavity; 13. Heat conducting plate; 14. Battery module cover; 15. Upper cover; 16. Fixed beam; 21. Vertical movable beam; 22. Tensioning bolt; 23. Horizontal movable beam; 24. Guide shaft; 25. Pressing block; 26. Guide rib; 100. Battery module; 211. First limiting structure; 231. Second limiting structure.

[0046] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0049] The term "and / or" in this article is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0050] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] Reference Figure 1-2 , the present invention proposes a battery tensioning assembly, comprising: a driving device and a horizontal moving device;

[0052] The driving device is connected to the horizontal moving device and is used to drive the moving part of the horizontal moving device to move horizontally. The horizontal moving device is used to provide horizontal force to the battery module 100.

[0053] In this embodiment, the horizontal moving device is driven by a driving device so that the moving part of the horizontal moving device moves horizontally, providing a horizontal force to the battery module 100. The driving device can be a spring, a V-shaped device, an electric device, etc. As a result, the battery module 100 can be directly installed between the battery accommodating cavities 12, and there is no need to set the battery module 100 into a module and then assemble it, which saves the assembly process of the battery pack. In addition, it saves the process structure brought by the module assembly, thereby saving space inside the battery pack, improving the overall space utilization of the battery pack, and thus increasing the energy capacity per unit volume of the battery pack. Among them, the battery module 100 refers to a plurality of battery cells stacked together, which can also be called a battery cell stack. It should be noted that the battery modules 100 at this time do not form a battery module, but are individual battery cells.

[0054] Reference Figure 3 as well as Figure 6-11 In one embodiment, the horizontal moving device includes a vertical moving beam 21 and a guide device, wherein the moving portion is a horizontal moving beam 23; the driving device is connected to the vertical moving beam 21 and is used to apply a vertical force to the vertical moving beam 21 to move the vertical moving beam in the vertical direction; the horizontal moving beam 23 is provided with a first inclined surface on the side close to the vertical moving beam 21, and the vertical moving beam 21 is in contact with the first inclined surface of the horizontal moving beam 23; the guide device is slidably connected to the horizontal moving beam 23 to allow the horizontal moving beam 23 to move horizontally on the guide device. The driving device can specifically be a tensioning bolt 22 or a clamping block 25, the purpose of which is to limit the vertical moving beam 21 in the vertical direction. The driving device is connected to the vertical moving beam 21 and is used to apply a vertical force to the vertical moving beam 21 to move the vertical moving beam in the vertical direction. The guide device can specifically be a guide shaft 24 or a guide rib 26.

[0055] In one embodiment, the driving device is a tensioning bolt 22, which is sleeved on the vertical moving beam 21 and applies vertical force to the vertical moving beam 21 through the bolt head of the tensioning bolt 22, so that the vertical moving beam moves in the vertical direction. The side of the tensioning bolt 22 away from the bolt head is threadedly connected to the bottom of the battery accommodating cavity 12.

[0056] In this embodiment, by sleeved the tensioning bolt 22 on the vertical moving beam 21, and limiting the vertical moving beam 21 by the bolt head of the tensioning bolt 22, the side of the tensioning bolt 22 away from the bolt head is fixedly connected to the bottom plate of the box body accommodating the battery module 100, so that the vertical moving beam 21 can only move in the vertical direction, and then the vertical moving beam 21 is in contact and connected with the horizontal moving beam 23. Since the horizontal moving beam 23 is provided with a first inclined surface on the side close to the vertical moving beam, when the vertical moving beam 21 moves up and down, the horizontal moving beam 23 is in contact and connected with the horizontal moving beam 23, so that the horizontal moving beam 23 can be moved horizontally, thereby realizing the horizontal force exerted by the horizontal moving beam 23 to cooperate with the cavity wall, and then tightening the battery module 100. Specifically, if the first inclined plane is set above the horizontal moving beam 23, the vertical moving beam 21 will be moved downward, which can cause the horizontal moving beam 23 to move away from the vertical moving beam 21. If the first inclined plane is set below the horizontal moving beam 23, the vertical moving beam 21 will be moved upward, which can cause the horizontal moving beam 23 to move away from the vertical moving beam 21.

[0057] In one embodiment, the driving device is a pressing block 25 , which is connected to the vertical moving beam 21 and is used to apply a vertical force to the vertical moving beam 21 to move the vertical moving beam in the vertical direction.

[0058] In one embodiment, the tensioning bolt 22 includes one or more. Since a single tensioning bolt 22 may exert uneven downward force or even become loose during use, it is preferred to provide multiple tensioning bolts 22. The specific number can be set according to actual conditions.

[0059] In one embodiment, the vertical movable beam 21 is provided with a bolt hole through which the bolt is limited. That is, the tensioning bolt 22 is threadedly connected to the bottom of the battery accommodating cavity 12 through the bolt hole. The limiting effect of the bolt head and the bolt hole allows the vertical movable beam 21 to move only up and down. Thus, the vertical movable beam 21 can move up and down. When tightening the battery module 100, it is only necessary to tighten the bolt to move the vertical movable beam 21 downward, thereby driving the horizontal movable beam 23 to move toward both ends, thereby achieving the effect of tightening the battery module 100.

[0060] In one embodiment, an inclined structure is provided on a side of the vertical moving beam close to the horizontal moving beam, and the first inclined surface is in contact with and connected to the inclined structure.

[0061] The contact point between the vertical moving beam 21 and the horizontal moving beam 23 is provided with an inclined structure. It should be noted that it is necessary to ensure that the inclined structure can contact the first inclined surface. That is, if the first inclined surface is provided above the horizontal moving beam 23, the inclined structure should be provided below the vertical moving beam 21. If the first inclined surface is provided below the horizontal moving beam 23, the inclined structure should be provided above the vertical moving beam 21. The inclined structure can increase the contact area. On the one hand, it can reduce the unit force and effectively reduce the probability of deformation of the vertical moving beam 21 and the horizontal moving beam 23. On the other hand, the cooperation between the inclined structure and the first inclined surface can also make the vertical moving beam 21 and the horizontal moving beam 23 better move relative to each other. In addition, the inclination angle of the first inclined surface and the inclined structure is preferably the same, so that the first inclined surface and the inclined structure can be better fitted. In a specific embodiment, if the shape of the vertical moving beam 21 is a pyramid or a truncated cone, the inclined structure is specifically an inclined surface. If the shape of the vertical moving beam 21 is a cone or a truncated cone, the inclined structure is specifically an inclined line.

[0062] In one embodiment, a fixed beam 16 is further fixed to the bottom of the battery compartment 12. The fixed beam 16 is provided with threaded holes corresponding to the tensioning bolts, through which the tensioning bolts are threadedly connected. The fixed beam 16 also serves to limit the horizontal position of the horizontally movable beam 23. The tensioning bolts are fixedly connected to the bottom plate of the battery module 100 housing by connecting the fixed beam 16.

[0063] In a specific embodiment, the horizontal moving beams 23 include two, which are mirror-imaged on both sides of the vertical moving beam 21 and are respectively in contact with and connected to the vertical moving beam 21. The horizontal moving beams 23 can include two. If the horizontal moving beam 23 only includes one, the vertical moving beam 21 moves downward, which can only drive the horizontal moving beam 23 to apply clamping and tightening force in one direction. In order to save resources, the vertical moving beam 21 can be set to drive two horizontal moving beams 23 at the same time, applying pre-tightening force in different directions. Therefore, the inclined surface between the two horizontal moving beams 23 can form a V-shaped groove, and the bottom of the vertical moving beam 21 is set to a V-shaped structure, and the V-shaped structure can fit with the V-shaped groove.

[0064] In one embodiment, at least one cavity is provided on the vertical moving beam 21 and / or the horizontal moving beam 23 , and the cavity is specifically a weight-reducing hole or an internal hollow structure.

[0065] In order to reduce the weight of the battery pack and save resources, one or more weight-reducing holes / internal hollow structures may be provided on the vertical moving beam 21 and / or the horizontal moving beam 23. Preferably, such holes are provided on both the vertical moving beam 21 and the horizontal moving beam 23. The specific setting method is not limited, and any setting that does not affect the functions of the vertical moving beam 21 and the horizontal moving beam 23 is acceptable.

[0066] In one embodiment, the tensioning bolts 22 and the vertical moving beam 21 may also include multiple ones to make the force on the horizontal moving beam 23 more uniform. The specific number needs to be set according to the size of the battery pack or the size of the horizontal moving beam 23.

[0067] In one embodiment, the shape of the vertical moving beam 21 can be a pyramid or a truncated pyramid; or a cone or a frustum.

[0068] In one embodiment, the cavity wall is a reinforcing beam 11. The reinforcing beam 11 increases the beam's load-bearing capacity and rigidity, making it more stable under load. It also extends the structure's service life and reduces deformation and cracking. Reinforcing and strengthening the battery pack structure can improve its seismic resistance. By reinforcing the beam 11, the overall performance of the original structure can be improved, enhancing its reliability and safety, and ensuring the reliability of applying preload to the battery module 100.

[0069] In one embodiment, the guide device is a guide shaft 24 or a guide rib 26 .

[0070] In one embodiment, a first limiting structure 211 is provided on the side of the vertical moving beam close to the horizontal moving beam, and a second limiting structure 231 is provided on the side of the horizontal moving beam close to the vertical moving beam. When the vertical moving beam moves up and down, the first limiting structure 211 and the second limiting structure 231 are in contact with each other to limit the vertical moving beam.

[0071] Reference Figure 2 , the present invention also provides a battery pack, comprising: a battery module 100, a box body 1 and the above-mentioned battery tensioning assembly;

[0072] The horizontal movement device is disposed between the battery accommodating cavities 12 and is in contact with and connected to the battery module 100;

[0073] The box body 1 is provided with a plurality of battery accommodating cavities 12 , and the battery modules are arranged in the battery accommodating cavities 12 and are in contact with and connected to the cavity wall of the battery accommodating cavities 12 on a side away from the horizontal moving device.

[0074] In this embodiment, by arranging multiple battery accommodating cavities 12 on the box body 1 and then arranging the tensioning module 2 between the battery accommodating cavities 12, when the battery module 100 is placed in the battery accommodating cavity 12, the tensioning module 2 can provide horizontal tension to the battery module 100, and apply a pre-tightening force to the battery module 100 together with the cavity wall of the battery accommodating cavity 12. Specifically, the tensioning module 2 applies a horizontal force to both ends, which can specifically be two horizontal moving beams 23 and a driving device for the horizontal moving beam 23. The driving device can drive the horizontal moving beam 23 to apply horizontal force to both ends, that is, the horizontal moving beam 23 can apply a horizontal force to the side close to the battery accommodating cavity 12.

[0075] In this embodiment, the cavity wall is a reinforcing beam 11 .

[0076] Reference Figure 4-5 In one embodiment, the guide device is a guide rib 26 fixed to the wall of the battery compartment. Alternatively, the guide device can be a rib attached to the box body 1. Specifically, the guide rib 26 is integrally formed with the box body 1. Because the guide rib 26 is slidably connected to the horizontal movable beam 23, this method can limit the vertical position of the horizontal movable beam 23. The horizontal movable beam 23 is provided with a guide groove that matches the guide rib 26, and is slidably connected to the guide rib 26 via the guide groove.

[0077] In some embodiments, the vertical moving beam 21 can also be limited by an interference fit, that is, an interference structure corresponding to the vertical moving beam 21 is provided on the horizontal moving beam 23. When a downward force is applied to the vertical moving beam 21, the vertical moving beam 21 moves downward and is limited to the horizontal moving beam 23 by the interference structure. At this time, the horizontal force transmitted by the horizontal moving beam 23 can also make the interference structure more stable. The vertical moving beam 21 can also be limited by an external electric drive, that is, a continuous downward force is applied to the vertical moving beam 21 by an external electric drive, so that the vertical moving beam 21 moves downward, pushing the horizontal moving beam 23 to move to both ends.

[0078] In one embodiment, a battery module cover 14 is further included. The battery module cover 14 is connected to the box body 1 and is used to cover the battery accommodating cavity 12 .

[0079] In this embodiment, the battery module 100 is placed in the battery accommodating cavity 12 and connected to the box body 1 through the battery module cover 14. The cover is set on the battery accommodating cavity 12 to protect the battery module 100 in the battery accommodating cavity 12.

[0080] In one embodiment, the box body 1 includes an upper cover 15 and a lower cover, the battery accommodating cavity 12 is disposed in the lower cover, and the upper cover 15 is used to cover the lower cover.

[0081] In this embodiment, the box body 1 includes an upper cover 15 and a lower cover. The battery accommodating cavity 12 is disposed within the lower cover, and the upper cover 15 is used to cover the lower cover. The upper cover 15 covering the lower cover facilitates assembly of the battery pack and enhances the appearance of the assembled battery pack.

[0082] In one embodiment, a heat conducting plate 13 is further included. The heat conducting plate 13 is disposed in the battery accommodating cavity 12 and between the battery module 100 and the box body 1 , and is in contact with and connected to the battery module 100 .

[0083] In this embodiment, since the battery module 100 releases heat during the charging and discharging process, a heat conducting plate 13 can be provided. It is arranged in the battery accommodating cavity 12 and between the battery module 100 and the box body 1, in contact with the battery module 100, so that the heat generated by the battery module 100 during the charging and discharging process can be released.

[0084] The present invention also provides a battery assembly method, comprising:

[0085] S1: Place the battery module in the battery receiving cavity of the box body;

[0086] S2: placing a battery tensioning assembly between the battery accommodating cavities;

[0087] S3: starting the driving device in the battery tensioning assembly to move the horizontal moving device toward the battery module;

[0088] S4: When the vertical movable beam 21 moves until the first limiting structure 211 thereof contacts the second limiting structure 231 of the horizontal movable beam 23 , the clamping assembly of the battery module 100 is completed.

[0089] As described in the above steps S1-S4, by arranging multiple battery accommodating cavities 12 on the box body 1 and then arranging the tensioning module 2 between the battery accommodating cavities 12, when the battery module 100 is placed in the battery accommodating cavity 12, the tensioning module 2 can provide horizontal tension to the battery module 100, and apply a pre-tightening force to the battery module 100 together with the cavity wall of the battery accommodating cavity 12. When the vertical moving beam 21 moves to its first limiting structure 211 and contacts the second limiting structure 231 of the horizontal moving beam 23, the limiting action between the first limiting structure 211 and the second limiting structure 231 and the limiting action of the tensioning bolt 22 are used to complete the vertical limitation of the vertical moving beam 21, thereby completing the clamping assembly of the battery module 100.

[0090] Beneficial effects of the present invention: horizontal tension is provided to the battery module 100 through the tensioning module 2, and a pre-tightening force is applied to the battery module 100 together with the cavity wall of the battery accommodating cavity 12, so that the battery module 100 can be directly loaded into the battery accommodating cavity 12, without the need to set the battery module 100 into a module and then assemble it, thus saving the assembly process of the battery pack. In addition, the process structure brought by the assembly of the module is saved, thereby saving the space inside the battery pack, improving the overall space utilization of the battery pack, and thus improving the energy capacity per unit volume of the battery pack.

[0091] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A battery tensioning assembly for fixing a battery module, characterized in that: include: Driving device and horizontal moving device; The driving device is connected to the horizontal moving device and is used to drive the moving part of the horizontal moving device to move horizontally. The horizontal moving device is used to provide horizontal force to the battery module.

2. The battery tensioning assembly according to claim 1, characterized in that: The horizontal moving device also includes a vertical moving beam and a guide device, and the moving part is a horizontal moving beam; The driving device is connected to the vertical moving beam and is used for applying a vertical force to move the vertical moving beam in the vertical direction. A first inclined surface is provided on a side of the horizontal moving beam close to the vertical moving beam. The vertical moving beam is in contact with and connected to the first inclined surface of the horizontal moving beam. The guiding device is slidably connected to the horizontal moving beam so that the horizontal moving beam moves horizontally on the guiding device.

3. The battery tensioning assembly according to claim 2, characterized in that: The driving device is a pressing block, which is connected to the vertical moving beam and applies a force in the vertical direction to move the vertical moving beam in the vertical direction.

4. The battery tensioning assembly according to claim 2, characterized in that: The driving device is a tensioning bolt, which is sleeved on the vertical moving beam and applies vertical force to the vertical moving beam through the bolt head of the tensioning bolt, so that the vertical moving beam moves in the vertical direction. The side of the tensioning bolt away from the bolt head is fixedly connected to the bottom plate of the box body accommodating the battery module.

5. The battery tensioning assembly according to claim 4, characterized in that: It also includes a fixing beam, which is fixed on the bottom plate of the box body accommodating the battery module, and the tensioning bolt is fixedly connected to the bottom plate of the box body of the battery module by connecting the fixing beam.

6. The battery tensioning assembly according to claim 2, characterized in that: A tilted structure is provided on one side of the vertical moving beam close to the horizontal moving beam, and the first inclined surface is in contact with and connected to the tilted structure.

7. The battery tensioning assembly according to claim 6, characterized in that: The inclination angle of the first inclined surface is the same as the inclination angle of the inclined structure, and the first inclined surface fits the inclined structure.

8. The battery tensioning assembly according to claim 2, characterized in that: At least one cavity is arranged on the vertical moving beam and / or the horizontal moving beam.

9. The battery tensioning assembly according to claim 2, characterized in that: The shape of the vertical moving beam is any one of a pyramid, a truncated pyramid, a cone and a truncated cone.

10. The battery tensioning assembly according to claim 9, characterized in that: The horizontal moving beams include two, which are mirror-imaged and arranged on both sides of the vertical moving beam and are respectively in contact with and connected to the vertical moving beam.

11. The battery tensioning assembly according to claim 2, characterized in that: The guide device is a guide shaft or a guide rib.

12. The battery tensioning assembly according to claim 2, characterized in that: A first limiting structure is provided on the side of the vertical moving beam close to the horizontal moving beam, and a second limiting structure is provided on the side of the horizontal moving beam close to the vertical moving beam. When the vertical moving beam moves up and down, the first limiting structure contacts with the second limiting structure to limit the vertical moving beam.

13. A battery pack, characterized in that: include: A battery module, a box body, and a battery tensioning assembly as claimed in any one of claims 1 to 12; The horizontal moving device is arranged between the battery accommodating cavities and is in contact and connected with the battery module; The box body is provided with a plurality of battery accommodating cavities, the battery modules are arranged in the battery accommodating cavities and are in contact with and connected to the cavity wall of the battery accommodating cavities on a side away from the horizontal moving device.

14. The battery pack according to claim 13, wherein: The cavity wall is a reinforcing beam.

15. The battery pack according to claim 13, characterized in that: The battery tensioning assembly is the battery tensioning assembly as claimed in claim 2; the guide device is a guide rib; The guide rib is fixed on the cavity wall of the battery accommodating cavity.

16. The battery pack according to claim 13, characterized in that: Also includes: A battery module cover, wherein the battery module is disposed in the battery accommodating cavity, and the battery module cover is connected to the box body and is used to cover the battery accommodating cavity.

17. The battery pack according to claim 13, wherein: The box body comprises an upper cover and a lower cover, the battery accommodating cavity is arranged in the lower cover, and the upper cover is used to cover the lower cover.

18. The battery pack according to claim 17, wherein: It also includes a heat conducting plate, which is arranged in the battery accommodating cavity and between the battery module and the box body, and is in contact with and connected to the battery module.

19. A battery assembly method, characterized in that: include: Placing the battery module in the battery receiving cavity of the box body; A tensioning assembly for placing a battery between the battery receiving cavities; Starting the driving device in the tensioning assembly of the battery to move the horizontal moving device toward the direction close to the battery module; When the vertical movable beam moves to the point where the first limiting structure thereof contacts the second limiting structure of the horizontal movable beam, the clamping assembly of the battery module is completed.

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