Battery with adjustable pre-tightening force

Abstract

The utility model discloses a battery capable of adjusting pretightening force, which comprises a battery shell, a battery cell module and an elastic mechanism, the battery cell module is formed by stacking a plurality of battery cells, the battery cell module is arranged in the battery shell, one end of the battery cell module abuts against the side wall of one side of the battery shell, and the other end of the battery cell module abuts against the side wall of the other side of the battery shell. A gap is reserved between the other end of the battery cell module and the side wall of the other side of the battery shell, the elastic assembly is arranged in the gap and is in contact with the battery cell module so as to generate pre-tightening force on the battery cell module, and the elastic mechanism moves towards a first direction or a second direction along with expansion or reduction of the volume of the battery cell module so as to enable the battery cell module to be in contact with the battery cell module. Therefore, the pre-tightening force on the battery cell module is adjusted. The pre-tightening force of the battery capable of adjusting the pre-tightening force can be adjusted along with the volume change of the battery cell module.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery, specifically relates to a kind of adjustable pre-tightening force battery. BACKGROUND

[0002] As the smallest battery unit, cell needs to be stacked into module when using, generally through electrical connection piece to connect single cell in series / parallel.

[0003] The plug-in of cell and electrical connection piece is to align the pole of cell with the insertion end of electrical connection piece, and let the pole extrusion press into electrical connection piece. When battery pack has too large pre-tightening force, cell internal pressure increases, and it is not easy to disassemble cell when maintaining;When pre-tightening force is too small, cell is easy to displace in cycle process, and foam cannot absorb cell expansion.

[0004] In prior art, battery cannot adjust the pre-tightening force of cell module along with the expansion or shrinkage of cell module, which leads to the problems that cell internal pressure increases and is easy to cause thermal runaway, or cell is easy to displace in cycle process. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems existing in prior art, provides a kind of adjustable pre-tightening force battery, and the adjustable pre-tightening force battery can adjust the pre-tightening force of cell module along with the volume change of cell module.

[0006] In order to solve the above problems, the utility model adopts the following technical scheme:

[0007] A kind of adjustable pre-tightening force battery, including battery shell, cell module, elastic mechanism, the cell module is stacked by multiple cells, the cell module is arranged in the battery shell, and one end is in abutment with the side wall of the side of the battery shell, the other end of the cell module and the side wall between the other side of the battery shell leave gap, the elastic component is arranged in gap, and it is in contact with the cell module, to generate pre-tightening force to cell module, along with the expansion or shrinkage of cell module volume, the elastic mechanism moves towards first direction or second direction, to adjust the pre-tightening force of cell module.

[0008] Preferably, the elastic mechanism comprises a steel sheet spring and a baffle, one end of the steel sheet spring is fixed on the side of the baffle away from the battery cell module, the other end is fixed on the side wall of the battery shell, the other side of the baffle abuts against the battery cell module, providing pre-tightening force to the battery cell module, when the volume of the battery cell module expands, the baffle moves towards the side wall of the battery shell, thereby extruding the steel sheet spring to bend, and then increasing the pre-tightening force to the battery cell module; when the volume of the battery cell module shrinks, the steel sheet spring rebounds, driving the baffle to move away from the side wall of the battery shell, and reducing the pre-tightening force to the battery cell module.

[0009] Preferably, the elastic mechanism comprises a support plate, the support plate is perpendicular to the bottom plate of the battery shell, the bottom end is fixedly installed on the bottom plate of the battery shell, and the upper end is a free end, which can rotate around the bottom end as a rotating shaft, and the support plate is in contact with the battery cell module to provide pre-tightening force to the battery cell module, when the volume of the battery cell module expands, the support plate rotates towards the side wall of the battery shell, thereby increasing the pre-tightening force to the battery cell module; when the volume of the battery cell module shrinks, the support plate rebounds, and the pre-tightening force to the battery cell module is reduced.

[0010] Preferably, the support plate is a cantilever structure.

[0011] Preferably, the material of the support plate is AL6061.

[0012] Preferably, the elastic mechanism comprises a push plate, a bolt and a spring, the side wall of the battery shell is provided with a threaded groove, the threaded rod of the bolt is threadedly connected with the threaded groove, the head of the bolt abuts against one side of the push plate, and the other side of the push plate abuts against the battery cell module, thereby providing pre-tightening force to the battery cell module, when the pre-tightening force to the battery cell module is too large, the bolt is twisted towards the side wall of the battery shell, the push plate moves towards the side wall of the battery shell under the expansion and extrusion of the battery cell module, thereby reducing the pre-tightening force to the battery cell module; when the pre-tightening force to the battery cell module is too small, the bolt is twisted away from the side wall of the battery shell, thereby driving the push plate to move away from the side wall of the battery shell, thereby increasing the pre-tightening force to the battery cell module, and the spring is sleeved on the threaded rod of the bolt.

[0013] Preferably, the head of the bolt is a hexagonal shank.

[0014] Preferably, the elastic mechanism is provided with multiple groups, the multiple groups of elastic mechanisms are arranged in parallel and can be independently adjusted.

[0015] Preferably, the battery cell module is provided with foam between adjacent two battery cells.

[0016] Preferably, a fireproof plate is provided between two adjacent battery cells in the battery cell module.

[0017] The battery with adjustable preload in this utility model can adjust its preload as the volume of the cell module changes, thereby flexibly adjusting the preload on the cell module, thereby better controlling the expansion of the cell module and facilitating the easy disassembly of the cell module, thereby improving disassembly efficiency. In addition, it can effectively prevent the cell module from easily causing thermal runaway due to increased internal pressure of the cell, or the cell from shifting during cycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a battery with adjustable preload in Example 1 of the present utility model;

[0019] Figure 2 1 is a top view of a battery with adjustable preload in Example 1 of the present utility model;

[0020] Figure 3 2 is a cross-sectional view of the elastic mechanism of the battery with adjustable preload in Example 1 of the present utility model;

[0021] Figure 4 This is a schematic structural diagram of a battery with adjustable preload in Example 2 of the present utility model;

[0022] Figure 5 1 is a top view of a battery with adjustable preload in Example 2 of the present utility model;

[0023] Figure 6 is a cross-sectional view of a support plate of a battery with adjustable preload in Example 2 of the present utility model;

[0024] Figure 7 This is a schematic structural diagram of a battery with adjustable preload in Example 3 of the present utility model;

[0025] Figure 8 1 is a top view of a battery with adjustable preload in Example 3 of the present utility model;

[0026] Figure 9 It is a cross-sectional view of the elastic mechanism of the battery with adjustable preload in Example 3 of the present utility model.

[0027] In the figure: 100 - battery housing, 110 - bottom plate, 120 - side wall, 200 - battery cell module, 300 - elastic mechanism, 310 - steel plate spring, 320 - baffle, 330 - support plate, 340 - push plate, 350 - bolt, 360 - spring, 370 - thread groove. DETAILED DESCRIPTION

[0028] With reference to the accompanying drawings, the technical solutions in the utility model will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of the utility model.

[0029] In the description of the utility model, it should be explained that the terms such as "upper" indicate the orientation or positional relationship shown in the drawings, and are only for the convenience and simplification of description, and are not indicative or suggestive of the device or element indicated must be provided with a particular orientation, constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the utility model.

[0030] In the description of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or suggesting relative importance.

[0031] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "connection", "setting", "installation", "fixing" and the like should be understood broadly, for example, can be fixedly connected or can be detachably connected, or integrally connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] The utility model provides a kind of adjustable pre-tightening force battery, including battery shell, electric core module, elastic mechanism, electric core module is stacked by multiple electric core, electric core module is set in battery shell, its one end and the side wall of the side of battery shell abuts, and the other end of electric core module and the side wall between the other side of battery shell leave gap, and elastic component is set in gap, and mutually contact with electric core module, to generate pre-tightening force to electric core module, with the expansion or shrinkage of electric core module volume, elastic mechanism moves towards first direction or second direction, to adjust the pre-tightening force to electric core module.

[0033] Embodiment 1

[0034] As Figures 1-3As shown, this embodiment discloses a battery with adjustable preload, comprising a battery housing 100, a cell module 200, and an elastic mechanism 300. The battery housing 100 is drawer-shaped, and the cell module 200 is composed of a plurality of stacked cells. The cell module 200 is arranged in the battery housing 100, with one end thereof abutting against the side wall of one side of the battery housing 100, and a gap is left between the other end of the cell module 200 and the side wall of the other side of the battery housing 100. The elastic component is arranged in the gap and contacts the cell module 200 to generate a preload on the cell module 200. As the volume of the cell module 200 expands or contracts, the elastic mechanism 300 moves in a first direction or a second direction to adjust the preload on the cell module 200. The first direction and the second direction are directions toward or away from the side wall of the battery housing.

[0035] like Figure 1 、 2 As shown, in this embodiment, the elastic mechanism 300 includes a steel plate spring 310 and a baffle 320. One end of the steel plate spring 310 is fixed to the side of the baffle 320 away from the battery module 200, and the other end is fixed to the side wall 120 of the battery housing 100. The baffle 320 is a plate-shaped structure, which is arranged in a vertical direction (perpendicular to the bottom plate 110 of the battery housing 100). The other side of the baffle 320 abuts against the battery module 200 to provide a pre-tightening force on the battery module 200.

[0036] like Figure 3 As shown, the steel plate spring piece 310 is composed of a plurality of thin spring pieces stacked together to form a strip-like structure, so that the steel plate spring piece 310 can bend when subjected to a pre-tightening force, and the pre-tightening force can be elastically adjusted, thereby better controlling the expansion of the battery cell module 200. When the battery cell module 200 expands in volume, it drives the baffle 320 to move toward the side wall 120 of the battery housing 100, thereby squeezing the steel plate spring piece 310 to bend, thereby increasing the pre-tightening force on the battery cell module 200. When the battery cell module 200 shrinks in volume, the steel plate spring piece 310 rebounds, driving the baffle 320 to move toward the direction away from the side wall 120 of the battery housing 100, and reducing the pre-tightening force on the battery cell module 200.

[0037] like Figure 1 As shown, specifically, two groups of parallel battery cell modules 200 are provided in the battery housing 100, and an elastic mechanism 300 is provided in the gap between each group of battery cell modules 200 and the side wall 120 of the battery housing 100. The elastic mechanism 300 includes a baffle 320 and two steel plate springs 310. The two steel plate springs 310 are arranged in parallel between the baffle 320 and the side wall 120 of the battery housing 100. Specifically, the two ends of the steel plate springs 310 can be fixed by welding, bonding, or screwing.

[0038] Optionally, the adjacent two battery cells in the battery cell module 200 are provided with foam and fireproof plate for absorbing the expansion of the battery cells and isolating the heat of the adjacent battery cells, so as to stabilize the performance of the battery cells.

[0039] The working principle of the battery with adjustable pre-tightening force in the embodiment is shown as follows:

[0040] When the battery cell module 200 is installed, one end of the battery cell module 200 abuts against the side wall 120 on one side of the battery shell 100, and the other end leaves a gap with the side wall 120 on the other side of the battery shell 100;

[0041] The baffle 320 and the steel plate spring 310 are installed in the gap, and one side of the baffle 320 is in contact with the battery cell module 200, and the two ends of the steel plate spring 310 are respectively fixed on the side of the baffle 320 away from the battery cell module 200 and the side wall 120 of the battery shell 100, and the steel plate spring 310 has a certain bending amount in the initial position, so that the baffle 320 exerts a pre-tightening force on the battery cell module 200;

[0042] When the volume of the battery cell module 200 expands, the battery cell module 200 drives the baffle 320 to move towards the side wall 120 of the battery shell 100, so as to squeeze the steel plate spring 310 to bend, thereby increasing the pre-tightening force on the battery cell module 200; when the volume of the battery cell module 200 shrinks, the steel plate spring 310 rebounds, driving the baffle 320 to move away from the side wall 120 of the battery shell 100, and reducing the pre-tightening force on the battery cell module 200.

[0043] The battery with adjustable pre-tightening force in the embodiment can automatically adjust the pre-tightening force on the battery cell module 200 with the change of the volume of the battery cell module 200, so as to better control the expansion of the battery cell module 200. At the same time, it can ensure that the battery cell does not loosen or is not disturbed by external force during operation, and the steel plate spring 310 can change the shape of bending to meet the needs of different battery cells. And the battery cell module 200 can be easily disassembled, improving the disassembly efficiency. In addition, it can also effectively avoid the problems that the battery cell module 200 is prone to increase the internal pressure of the battery cell and is prone to thermal runaway or displacement during the cycle process.

[0044] Embodiment 2

[0045] As Figures 3-6As shown, the difference between this embodiment and Example 1 is that a different elastic mechanism 300 is used. In this embodiment, the elastic mechanism 300 includes a support plate 330, which is perpendicular to the bottom plate 110 of the battery housing 100 (arranged along the vertical direction), with its bottom end fixedly mounted on the bottom plate 110 of the battery housing 100, and its upper end being a free end. The upper end of the support plate 330 can rotate with its bottom end as the rotation axis, and one side of the support plate 330 contacts and squeezes the battery cell module 200 to provide a pre-tightening force on the battery cell module 200, and the other side of the support plate 330 leaves room for movement with the side wall 120 of the battery housing 100.

[0046] When the volume of the battery cell module 200 expands, the upper end of the support plate 330 is driven to rotate toward the direction close to the side wall 120 of the battery housing 100, thereby increasing the pre-tightening force on the battery cell module 200; when the volume of the battery cell module 200 shrinks, the support plate 330 rebounds and reduces the pre-tightening force on the battery cell module 200.

[0047] like Figure 4 As shown, the battery housing 100 is a drawer-like structure, with its bottom being its base plate 110 and its side being its side wall 120. Specifically, the support plate 330 is a cantilever structure, and its material is made of elastic AL6061. The bottom end of the support plate 330 is fixed to the base plate 110, and the other end is a free end. Space is left inside the battery housing 100 for the support plate 330 to move. The resistance inside the material of the support plate 330 can resist the preload and bending moment applied by the battery module 200, and can provide support for the upper cover of the battery housing 100. When it is necessary to disassemble the battery cell assembly, the upper end of the support plate 330 is moved toward the side wall 120 of the battery housing 100 to reserve space for disassembly of the battery cell module 200, thereby easily completing the disassembly of the battery cell module 200.

[0048] Specifically, two groups of parallel battery cell modules 200 are disposed in the battery housing 100 , and a support plate 330 is disposed in the gap between each group of battery cell modules 200 and the side wall 120 of the battery housing 100 .

[0049] Optionally, foam and a fireproof plate are provided between two adjacent battery cells in the battery cell module 200 to absorb the expansion of the battery cells and isolate the heat of adjacent battery cells, thereby stabilizing the performance of the battery cells.

[0050] The working principle of the battery with adjustable preload in this embodiment is as follows:

[0051] When installing the battery cell module 200, one end of the battery cell module 200 abuts against the side wall 120 on one side of the battery housing 100, and a gap is left between the other end and the side wall 120 on the other side of the battery housing 100;

[0052] The bottom of the support plate 330 is fixed on the bottom plate 110 of the battery shell 100, and the support plate 330 is kept perpendicular to the bottom plate 110 of the battery shell 100;

[0053] The support plate 330 is in contact with the battery cell module 200 and is extruded, so that the support plate 330 can provide a pre-tightening force for the battery cell module 200 in the initial state;

[0054] When the volume of the battery cell module 200 expands, the upper end of the support plate 330 is driven to rotate towards the side wall 120 of the battery shell 100, thereby increasing the pre-tightening force on the battery cell module 200; when the volume of the battery cell module 200 shrinks, the support plate 330 rebounds and reduces the pre-tightening force on the battery cell module 200.

[0055] The battery with adjustable pre-tightening force in the embodiment can automatically adjust the pre-tightening force on the battery cell module 200 as the volume of the battery cell module 200 changes, thereby better controlling the expansion of the battery cell module 200. Moreover, the battery cell module 200 can be easily disassembled, improving the disassembly efficiency. At the same time, it can ensure that the battery cell does not loosen or is not disturbed by external forces during operation, and can also effectively avoid problems such as easy increase of internal pressure of the battery cell, easy thermal runaway of the battery cell module 200, and easy displacement of the battery cell during the cycle process.

[0056] Embodiment 3

[0057] The difference between the embodiment and the embodiments 1 and 2 is that different elastic mechanisms 300 are used. In the embodiment, as shown in Figures 7-9 the elastic mechanism 300 includes a push plate 340, a bolt 350, and a spring 360. The side wall 120 of the battery shell 100 is provided with a threaded groove 370, the screw rod part of the bolt 350 is threadedly connected with the threaded groove 370, the threaded groove 370 provides a space for the movement of the screw rod part of the bolt 350, the head of the bolt 350 abuts against one side of the push plate 340, and the other side of the push plate 340 abuts against the battery cell module 200, thereby providing a pre-tightening force for the battery cell module 200.

[0058] When the pre-tightening force on the battery cell module 200 is too large, the bolt 350 is twisted towards the side wall 120 of the battery shell 100, and the expansion of the battery cell module 200 drives the push plate 340 to move towards the side wall 120 of the battery shell 100, thereby providing a larger space for the battery cell module 200 and reducing the pre-tightening force of the elastic mechanism 300 on the battery cell module 200.

[0059] When the pre-tightening force on the battery cell module 200 is too small, the bolt 350 is screwed in a direction away from the side wall 120 of the battery casing 100 to drive the push plate 340 to move in a direction away from the side wall 120 of the battery casing 100, thereby reducing the space of the battery cell module 200 and increasing the pre-tightening force on the battery cell module 200. The spring 360 is sleeved on the screw part of the bolt 350.

[0060] The spring 360 can increase the stability of the bolt 350, reduce impact, extend the service life of the bolt 350, and also prevent the screw portion of the bolt 350 from being screwed to the end, thereby preventing the screw portion from falling out and being damaged.

[0061] like Figure 7 As shown, specifically, two groups of parallel battery cell modules 200 are provided in the battery casing 100, and an elastic mechanism 300 is provided in the gap between each group of battery cell modules 200 and the side wall 120 of the battery casing 100. An elastic mechanism 300 includes a push plate 340, two bolts 350 and two springs 360. The two springs 360 are respectively mounted on the two bolts 350, and the two bolts 350 are arranged in parallel between the push plate 340 and the side wall 120 of the battery casing 100, and each bolt 350 can move independently to realize multi-point adjustment of the push plate 340, which helps to control the preload force of the battery cell module 200.

[0062] Optionally, the head of the bolt 350 is a hexagonal screw handle, so that the wrench can be easily operated in the narrow space inside the battery housing 100.

[0063] Optionally, foam and a fireproof plate are provided between two adjacent battery cells in the battery cell module 200 to absorb the expansion of the battery cells and isolate the heat from the adjacent batteries, thereby stabilizing the performance of the battery cells.

[0064] The working principle of the battery with adjustable preload in this embodiment is as follows:

[0065] When installing the battery cell module 200, one end of the battery cell module 200 abuts against the side wall 120 on one side of the battery housing 100, and a gap is left between the other end and the side wall 120 on the other side of the battery housing 100;

[0066] Install the push plate 340 and the bolt 350 in the gap so that one side of the baffle 320 contacts the battery cell module 200, the head end of the bolt 350 abuts against the other side of the baffle 320, the screw portion of the bolt 350 is threadedly connected to the thread groove 370 provided on the side wall 120 of the battery housing 100, and the spring 360 is sleeved on the screw portion of the bolt 350;

[0067] When the pre-tightening force on the battery cell module 200 is too large, the bolt 350 is screwed in the direction of the side wall 120 of the battery shell 100, the expansion of the battery cell module 200 pushes the push plate 340 to move in the direction of the side wall 120 of the battery shell 100, thereby providing more space for the battery cell module 200, and reducing the pre-tightening force of the elastic mechanism 300 on the battery cell module 200;

[0068] When the pre-tightening force on the battery cell module 200 is too small, the bolt 350 is screwed in the direction away from the side wall 120 of the battery shell 100 to drive the push plate 340 to move in the direction away from the side wall 120 of the battery shell 100, thereby reducing the space of the battery cell module 200, and increasing the pre-tightening force on the battery cell module 200, and the spring 360 is sleeved on the screw rod part of the bolt 350.

[0069] The battery with adjustable pre-tightening force in the embodiment can adjust the pre-tightening force on the battery cell module 200 by adjusting the position of the bolt 350, thereby better controlling the expansion of the battery cell module 200. At the same time, it can ensure that the battery cell will not loosen or be disturbed by external force during work, and the battery cell module 200 can be easily disassembled, improving the disassembly efficiency. In addition, it can also effectively avoid the problems that the battery cell module 200 is prone to increase the internal pressure of the battery cell and easily cause thermal runaway, or the battery cell is prone to displacement during the cycle process.

[0070] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. A battery with adjustable preload, characterized in that: The invention comprises a battery housing (100), a battery cell module (200), and an elastic mechanism (300), wherein the battery cell module (200) is formed by stacking a plurality of battery cells, the battery cell module (200) is arranged in the battery housing (100), one end of the battery cell module is against the side wall of one side of the battery housing (100), and a gap is left between the other end of the battery cell module (200) and the side wall of the other side of the battery housing (100), the elastic mechanism (300) is arranged in the gap and contacts the battery cell module (200) to generate a pre-tightening force on the battery cell module (200), and as the volume of the battery cell module (200) expands or contracts, the elastic mechanism (300) moves in a first direction or a second direction to adjust the pre-tightening force on the battery cell module (200).

2. The battery with adjustable preload according to claim 1, characterized in that: The elastic mechanism (300) includes a steel plate spring (310) and a baffle (320), one end of the steel plate spring (310) is fixed to a side of the baffle (320) away from the battery module (200), and the other end is fixed to the side wall (120) of the battery housing (100), the other side of the baffle (320) is pressed against the battery module (200), and provides a pre-tightening force to the battery module (200), when the volume of the battery module (200) expands, the baffle (320) is driven to move toward the side wall (120) of the battery housing (100), thereby squeezing the steel plate spring (310) to bend, thereby increasing the pre-tightening force on the battery module (200); when the volume of the battery module (200) shrinks, the steel plate spring (310) rebounds, The baffle (320) is driven to move in a direction away from the side wall (120) of the battery housing (100), and the pre-tightening force on the battery cell module (200) is reduced.

3. The battery with adjustable preload according to claim 1, characterized in that: The elastic mechanism (300) includes a support plate (330), the support plate (330) is perpendicular to the bottom plate (110) of the battery housing (100), the bottom end of the support plate is fixedly mounted on the bottom plate (110) of the battery housing (100), the upper end of the support plate (330) is a free end, and the bottom end can be rotated as a rotation axis, and the support plate (330) and the battery module (200) are in contact and squeezed with each other, providing a pre-tightening force on the battery module (200); when the volume of the battery module (200) expands, the support plate (330) is driven to rotate in a direction close to the side wall (120) of the battery housing (100), thereby increasing the pre-tightening force on the battery module (200); when the volume of the battery module (200) shrinks, the support plate (330) rebounds and reduces the pre-tightening force on the battery module (200).

4. The battery with adjustable preload according to claim 3, characterized in that: The support plate (330) is a cantilever structure.

5. The battery with adjustable preload according to claim 4, characterized in that: The material of the support plate (330) is AL6061.

6. The battery with adjustable preload according to claim 1, characterized in that: The elastic mechanism (300) includes a push plate (340), a bolt (350), and a spring (360). A threaded groove (370) is provided on the side wall (120) of the battery housing (100). The screw portion of the bolt (350) is threadedly connected to the threaded groove (370). The head of the bolt (350) abuts against one side of the push plate (340), and the other side of the push plate (340) abuts against the battery cell module (200), thereby providing a pre-tightening force to the battery cell module (200). When the pre-tightening force on the battery cell module (200) is too large, the bolt (350) is screwed toward the side wall (120) of the battery housing (100). Under the expansion and compression of the battery cell module (200), the push plate (340) moves toward the battery housing (100). The push plate (340) moves in the direction of the side wall (120) of the battery housing (100), thereby reducing the pre-tightening force on the battery module (200); when the pre-tightening force on the battery module (200) is too small, the bolt (350) is screwed in the direction away from the side wall (120) of the battery housing (100) to drive the push plate (340) to move in the direction away from the side wall (120) of the battery housing (100), thereby increasing the pre-tightening force on the battery module (200), and the spring (360) is sleeved on the screw portion of the bolt (350).

7. The battery with adjustable preload according to claim 6, characterized in that: The head of the bolt (350) is a hexagonal screw shank.

8. The battery with adjustable preload according to claim 6, characterized in that: The elastic mechanisms (300) are provided in multiple groups, and the multiple groups of elastic mechanisms (300) are arranged in parallel and can be adjusted independently.

9. The battery with adjustable preload according to any one of claims 1 to 8, characterized in that: Foam is provided between two adjacent battery cells in the battery cell module (200).

10. The battery with adjustable preload according to any one of claims 1 to 8, characterized in that: A fireproof plate is provided between two adjacent battery cells in the battery cell module (200).

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