Battery module

Abstract

The invention belongs to the technical field of energy storage equipment, and discloses a battery module, which comprises a frame body, a battery cell assembly and a cover plate, the frame body is provided with an inner cavity, and one end of the inner cavity is provided with a push plate; the battery cell assembly comprises a plurality of battery cell main bodies and a plurality of refrigeration sheets, the plurality of refrigeration sheets are arranged at intervals in the length direction of the inner cavity, a temperature control area is formed between every two adjacent refrigeration sheets, and the battery cell main bodies and the temperature control areas are arranged in a one-to-one correspondence mode and clamped in the temperature control areas; the cover plate is detachably connected with the frame body to seal the opening of the inner cavity, the cover plate is provided with a confluence assembly, and the confluence assembly abuts against the multiple battery cells to enable the multiple battery cells to be connected in series or in parallel. The battery cell main body is fixed and limited by the push plate and the cover plate, so that the traditional battery cell welding step is omitted, the welding problem is avoided, and the conductive stability of the battery module is ensured. And the plurality of refrigeration sheets are arranged to refrigerate each battery cell main body, so that the consistency of the battery cell main bodies is effectively improved, and the cycle life of the battery cell main bodies is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery module. Background Technology

[0002] Existing energy storage cabinets contain multiple battery modules, each containing multiple battery cells. These cells are typically bundled together and then directly welded to an aluminum plate to form the module. This assembly method has the following drawbacks: 1. The welding assembly process is complex and labor costs are high; 2. When welding the battery cells to the busbar, problems such as incomplete soldering, poor welding, and explosion points are prone to occur; 3. Existing modules lack temperature control and can only rely on air cooling and liquid cooling after subsequent PACK assembly. The heat dissipation surface is mostly the bottom and sides (thickness surface) of the battery cells, resulting in poor heat dissipation. The heat dissipation problems accumulate after subsequent battery cell assembly, greatly reducing the cycle life of the module. Summary of the Invention

[0003] The purpose of this invention is to provide a battery module that is easy to install and remove, requires fewer welding steps, and has excellent heat dissipation.

[0004] To achieve this objective, the present invention adopts the following technical solution: a battery module, comprising a frame, a cell assembly, and a cover plate. The frame has a top-opening inner cavity. Along the length direction of the inner cavity, one end of the inner cavity is provided with a push plate, which is movable along the length direction of the inner cavity. The cell assembly is located between the push plate and the inner wall of the frame. The cell assembly includes multiple cell bodies and multiple cooling chips. The multiple cooling chips are arranged at intervals along the length direction of the inner cavity, and a temperature control zone is formed between two adjacent cooling chips. The cell bodies and the temperature control zones are correspondingly arranged and sandwiched within the temperature control zones. The cover plate is detachably connected to the frame to close the opening of the inner cavity. The cover plate is provided with a busbar assembly, which abuts against the multiple cell bodies to connect the multiple cell bodies in series or in parallel.

[0005] Preferably, along the length of the inner cavity, a screw is connected to one side of the frame, the screw is threaded into the frame, and one end of the screw is located outside the inner cavity, while the other end is located inside the inner cavity and connected to the push plate.

[0006] Preferably, the length of the screw along the length of the inner cavity is less than the thickness of the battery cell body.

[0007] Preferably, the cross-section of the push plate and the cross-section of the inner cavity coincide in a cross-section perpendicular to the length direction of the inner cavity.

[0008] Preferably, in a cross-section perpendicular to the length direction of the inner cavity, the cross-section of the battery cell body and the cross-section of the cooling chip coincide.

[0009] Preferably, the cooling chip includes a semiconductor cooling layer and a heating layer that are bonded together. A temperature sensing line is provided at the center of the semiconductor cooling layer or the heating layer along the thickness direction of the cooling chip. A control line is provided at the edge of the cooling chip. A wire hole is provided at the end of the frame away from the push plate. The temperature sensing lines and control lines of the multiple cooling chips are all passed through the wire hole and are all connected to an external controller.

[0010] Preferably, the cooling element is connected to a fire detection tube, and the fire detection tubes of the multiple cooling elements are all inserted through the wire hole and are all connected to an external alarm.

[0011] Preferably, the busbar assembly has a first outlet and a second outlet. The first outlet extends along the length of the inner cavity and is suspended above the end of the frame away from the push plate. The second outlet extends along the width of the inner cavity and is suspended above the frame.

[0012] Preferably, heat dissipation holes are provided on both sides of the frame along the width direction of the inner cavity, and the heat dissipation holes are in communication with the inner cavity.

[0013] Preferably, each side has multiple heat dissipation holes, and the heat dissipation holes on the same side correspond one-to-one with the battery cell body.

[0014] The beneficial effects of this invention are as follows: During battery module assembly, multiple battery cell bodies and multiple cooling chips are first placed alternately between the push plate and the inner wall of the frame. Then, the push plate is moved to press the battery cell bodies and cooling chips together. Afterward, the cover plate and the frame are connected so that the busbar assembly abuts against the battery cell body, thus realizing multi-cell module assembly. The use of a push plate and cover plate to fix and limit the battery cell bodies results in a simple structure and convenient operation, effectively improving the ease of battery module assembly and disassembly. The contact between the busbar assembly of the cover plate and the battery cell body enables circuit conduction, eliminating the traditional cell welding step, avoiding welding problems, and ensuring the electrical stability of the battery module. By setting multiple cooling chips to cool each battery cell body, cell-level temperature control is achieved, ensuring that all battery cell bodies operate at the same temperature, effectively improving the consistency of the battery cell bodies and extending their cycle life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the battery module structure according to an embodiment of the present invention;

[0016] Figure 2 This is an exploded view of the pool module according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the frame structure according to an embodiment of the present invention;

[0018] Figure 4This is a structural schematic diagram of the frame from another angle according to an embodiment of the present invention.

[0019] In the diagram: 1. Frame; 11. Inner cavity; 12. Push plate; 13. Screw; 14. Heat dissipation hole; 15. Wire hole; 2. Battery cell assembly; 21. Battery cell body; 22. Cooling chip; 221. Temperature sensing wire; 222. Control wire; 3. Cover plate; 31. Busbar assembly; 311. First lead-out part; 312. Second lead-out part; 32. Fastening screw. Specific Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] Reference Figures 1 to 4As shown, a battery module according to an embodiment of this application includes a frame 1, a cell assembly 2, and a cover plate 3. The frame 1 is rectangular and has a top-opening inner cavity 11. Along the length direction of the inner cavity 11, a push plate 12 is provided at one end of the inner cavity 11, and the push plate 12 can move along the length direction of the inner cavity 11. In this embodiment, the end of the inner cavity 11 with the push plate 12 is defined as the rear end, and the other end as the front end. This is specifically mentioned here and will not be repeated hereafter.

[0025] The battery cell assembly 2 is located between the push plate 12 and the inner wall of the frame 1. The battery cell assembly 2 includes multiple square battery cell bodies 21 and multiple cooling chips 22. The multiple cooling chips 22 are arranged at intervals along the length direction of the inner cavity 11. A temperature control zone is formed between two adjacent cooling chips 22. The battery cell bodies 21 and the temperature control zones are arranged in a one-to-one correspondence and sandwiched in the temperature control zone.

[0026] The cover plate 3 matches the shape of the frame 1 and is detachably connected to the cover to close the opening of the inner cavity 11. The cover plate 3 is provided with a busbar assembly 31. Part of the busbar assembly 31 is located on the side of the cover plate 3 away from the frame 1, and the other part passes through the cover plate 3 and abuts against multiple battery cell bodies 21 to connect the multiple battery cell bodies 21 in series or in parallel. In this embodiment, the cover plate 3 is connected to the frame 1 by multiple fastening screws 32. Optionally, when the portion of the busbar assembly 31 located on the side of the cover plate 3 away from the frame 1 is configured as two long strip copper busbars (or aluminum busbars, which will be used as an example in the following description), the multiple battery cells 21 are connected in parallel when a single busbar assembly 31 is in contact with the same end (positive or negative) of multiple battery cell bodies 21; when the portion of the busbar assembly 31 located on the side of the cover plate 3 away from the frame 1 is configured as multiple connecting copper busbars, the different ends of two adjacent battery cell bodies 21 are connected through the battery cell bodies 21 (the two opposite ends of the battery cell bodies 21 at both ends are connected to copper busbars separately), the multiple battery cell bodies 21 are connected in series.

[0027] Understandably, during battery module assembly, multiple battery cell bodies 21 and multiple cooling chips 22 are first placed alternately between the push plate 12 and the inner wall of the frame 1. Then, the push plate 12 is moved to press the battery cell bodies 21 and cooling chips 22 together. After that, the cover plate 3 and the frame 1 are connected so that the busbar assembly 31 abuts against the battery cell body 21. The push plate 12 limits the battery cell body 21 along the thickness direction of the battery cell body 21, and the busbar assembly 31 limits the battery cell body 21 along the circumferential direction of the battery cell body 21, ensuring that the battery cell assembly 2 is installed stably and realizing multi-cell module assembly.

[0028] The cell body 21 is fixed and limited by a push plate 12 and a cover plate 3, which is simple in structure and easy to operate, effectively improving the ease of installation and removal of the battery module. The current-carrying component 31 of the cover plate 3 abuts against the cell body 21 to achieve circuit conduction, eliminating the traditional cell welding step, avoiding welding problems and ensuring the conductivity stability of the battery module. By setting multiple cooling chips 22 to cool each cell body 21, cell-level temperature control is achieved, ensuring that all cell bodies 21 operate at the same temperature, effectively improving the consistency of the cell bodies 21, extending the cycle life of the cell bodies 21, and reducing the probability of problems such as electrothermal runaway.

[0029] Reference Figure 2 As shown, the cooling element 22 includes a semiconductor cooling layer and a heating layer that are disposed opposite to each other and bonded together. Along the thickness direction of the cooling element 22 (i.e., the length direction of the inner cavity 11), a temperature sensing line 221 is provided at the center of one side of the cooling element 22, and a control line 222 is provided at the top edge of the cooling element 22. A wire hole 15 is provided at the end of the frame 1 away from the push plate 12. In this embodiment, the wire hole 15 is square. The temperature sensing lines 221 and control lines 222 of the multiple cooling elements 22 all pass through the wire holes 15 and are all connected to an external controller. Specifically, along the curling direction of the inner cavity 11, the width of the cooling element 22 is 1 mm smaller than the width of the inner cavity 11, so that the temperature sensing lines 221 and control lines 222 can be accommodated in the gap between the sidewall of the cooling element 22 and the sidewall of the inner cavity 11. Optionally, in this embodiment, the semiconductor cooling layer and heating layer are made of the same material, both consisting of a large number of thermocouples connected in series. Each thermocouple is constructed by connecting a P-type semiconductor material (bismuth telluride material doped with an excess of bismuth) and an N-type semiconductor material (bismuth telluride material doped with an excess of tellurium) with a metal connecting piece (usually a copper sheet or a copper-plated ceramic sheet). Cooling or heating is achieved by utilizing the property that the P-type and N-type semiconductor materials absorb and release heat at the junction when energized (Peltier effect).

[0030] By setting temperature sensing line 221 and control line 222, temperature sensing line 221 can detect the temperature of the cooling chip 22 in real time and feed it back to the external controller. The controller can then determine the working status of the battery cell based on the acquired temperature information, or adjust the power of the cooling chip 22 in real time to achieve high-precision temperature control. Specifically, if the controller senses that the temperature of the battery cell body 21 is too high based on the detection signal from temperature sensing line 221, it will activate the semiconductor cooling layer of the cooling chip 22 to cool down the battery cell body 21. If it senses that the temperature is too low, it will activate the heating layer of the cooling chip 22 to heat the battery cell. This allows the battery cell assembly 2 to operate under constant temperature conditions, improving the cycle performance of the battery cell module.

[0031] By setting a semiconductor cooling layer and a heating layer, which are relatively close together, the cooling chip 22 can not only dissipate heat to the battery cell bodies 21 on both sides when the temperature is high (the heat inside the cooling chip 22 is dissipated through the air cooling or liquid cooling system of the battery thermal management), but also heat the battery cell bodies 21 on both sides when the temperature is low, so as to ensure that the inner cavity 11 always maintains a suitable reaction temperature and effectively improves the charging and discharging efficiency of the battery module.

[0032] By setting the wire hole 15, the temperature sensing wires 221 and control wires 222 of multiple cooling chips 22 can be centrally managed, reducing the wiring length. The wire hole 15 is set on the side of the frame 1 away from the push plate 12 to avoid interference between the control wires 222 or temperature sensing wires 221 and the push plate 12, which would affect the disassembly and assembly of the battery module.

[0033] In some embodiments, each cooling element 22 is connected to a fire detection tube, which is a non-metallic flexible tube (such as polyimide) pre-filled with a fire extinguishing agent such as high-pressure nitrogen. This tube is capable of bursting and releasing the fire extinguishing agent when the temperature reaches a set threshold. The fire detection tubes of multiple cooling elements 22 are all inserted through wire holes 15 and connected to an external alarm. Optionally, the alarm can be a pressure switch, a relay, a warning light of a control system, etc., which will not be described in detail here.

[0034] By setting a fire detector tube, it can quickly explode when the temperature of the battery cell body 21 runs out of control, that is, when the temperature sensing line 221 detects that the temperature has reached the set threshold (usually 100℃~170℃), releasing the fire extinguishing agent and triggering the alarm, thereby protecting the battery cell body 21 and the cooling chip 22 and avoiding further losses.

[0035] Furthermore, in a cross-section perpendicular to the length direction of the inner cavity 11, the cross-section of the battery cell body 21 and the cross-section of the cooling chip 22 coincide, that is, the sidewalls of the battery cell body 21 and the sidewalls of the cooling chip 22 have the same shape and the same size.

[0036] The specifications of the battery cell body 21 and the side wall of the cooling element 22 are set to ensure that the cooling element 22 covers all positions of the side wall of the battery cell body 21, so that there will be no problem of uneven local heating or cooling temperature, and at the same time, it is convenient to align the battery cell body 21 and the cooling element 22.

[0037] Reference Figure 3 and Figure 4 As shown, it can be understood that a screw 13 is connected to one side of the frame 1 along the length direction of the inner cavity 11. The screw 13 is located at the center of the side wall of the frame 1, that is, along the vertical direction, the distance from the screw 13 to both sides of the frame 1 is the same, and along the width direction of the inner cavity 11, the distance from the screw 13 to both sides of the frame 1 is also the same. The screw 13 is threaded into the frame 1, and one end of the screw 13 is located outside the inner cavity 11 and has a head, while the other end is located inside the inner cavity 11 and is connected to the push plate 12.

[0038] By setting the screw 13 to drive the push plate 12 to move, on the one hand, the connection structure between the push plate 12 and the frame 1 can be simplified, the layout cost of the push plate 12 can be reduced, and the operation can be more convenient for users; on the other hand, the threaded structure between the screw 13 and the frame 1 can provide pressure to press the cell assembly 2, and the user can also precisely adjust the pressure of the push plate 12 by rotating the screw 13 to prevent the cell assembly 2 from loosening and ensure the stability of the battery module structure.

[0039] In other embodiments, a rigid block or elastic block may be provided between the side of the push plate 12 away from the cell assembly 2 and the inner wall of the frame 1 to provide pressure, which will not be described in detail here.

[0040] Furthermore, along the length direction of the inner cavity 11, the length of the screw 13 is less than the thickness of the battery cell body 21.

[0041] By limiting the length of the screw 13, the stroke of the push plate 12 can be limited, thereby limiting the maximum length of the space between the push plate 12 and the inner wall of the frame 1 for accommodating the cell assembly 2. Setting the length of the screw 13 to be less than the thickness of the cell body 21 limits the number of cell bodies 21 in the inner cavity 11 before and after the push plate 12 moves, preventing the addition of excess cell bodies 21. This ensures that the frame 1 of a fixed size corresponds to a specific number of cell bodies 21. Users do not need to consider spatial changes caused by the movement of the push plate 12 when assembling the battery module, further improving the ease of assembly and disassembly of the battery module.

[0042] Furthermore, in a cross-section perpendicular to the length direction of the inner cavity 11, the cross-section of the push plate 12 coincides with the cross-section of the inner cavity 11.

[0043] The push plate 12 is set to coincide with the cross section of the inner cavity 11, so that the push plate 12 can contact and cover the side wall of the battery cell assembly 2 (i.e. the side wall of the last end of the cooling chip 22 facing the push plate 12), so as to evenly distribute the pressure and ensure that the push plate 12 and the inner wall of the frame 1 cooperate to clamp the battery cell assembly 2, while avoiding the push plate 12 from crushing or damaging the battery cell assembly 2.

[0044] Reference Figure 1 and Figure 3 As shown, it can be understood that heat dissipation holes 14 are provided on both sides of the frame 1 along the width direction of the inner cavity 11, and the heat dissipation holes 14 are connected to the inner cavity 11. Optionally, the heat dissipation holes 14 can be a grid structure, honeycomb structure, etc. that penetrate the side wall of the frame 1, which will not be described in detail here.

[0045] By setting the heat dissipation holes 14, the heat in the inner cavity 11 can be further released, thereby improving the heat dissipation efficiency of the frame 1.

[0046] Furthermore, each side has multiple heat dissipation holes 14, and the heat dissipation holes 14 on the same side correspond one-to-one with the battery cell body 21. Specifically, the heat dissipation holes 14 are rectangular, and the multiple heat dissipation holes 14 on the same side correspond to the multiple battery cell bodies 21, and the orthographic projection of the heat dissipation hole 14 on the side wall of the corresponding battery cell body 21 is located inside the side wall of the battery cell body 21.

[0047] By setting the heat dissipation holes 14 one-to-one with the cell body 21, on the one hand, each cell body 21 can dissipate heat independently through the heat dissipation holes 14 on both sides, corresponding to cell-level temperature control, and further improving the heat dissipation efficiency of the cell body 21; on the other hand, it is convenient for users to observe the status of each cell body 21 during subsequent battery module maintenance and recycling, improving the user experience.

[0048] Reference Figure 1 and Figure 2 As shown, it can be understood that when the busbar assembly 31 consists of two strip copper busbars, i.e., multiple battery cell bodies 21 connected in parallel, one strip copper busbar has a first lead-out portion 311, and the other strip copper busbar has a second lead-out portion 312. The first lead-out portion 311 is connected to one of the terminals of the foremost battery cell body 21, and the second lead-out portion 312 is connected to one of the terminals of the rearmost battery cell body 21. The first lead-out portion 311 and the second lead-out portion 312 have different polarities. The first lead-out portion 311 extends along the length direction of the inner cavity 11 and is suspended above the end of the frame 1 away from the screw 13. The first lead-out portion 311 and the wire hole 15 are spaced apart along the width direction of the inner cavity 11. The second lead-out portion 312 extends along the width direction of the inner cavity 11 and is suspended above the frame 1. The second lead-out portion 312 and the wire hole 15 are located on the same side of the frame 1 along the width direction of the inner cavity 11. When the busbar assembly 31 consists of multiple connecting copper busbars, the two independent connecting copper busbars at both ends form the first lead-out portion 311 and the second lead-out portion 312 respectively. The arrangement of the first lead-out portion 311 and the second lead-out portion 312 can be referred to the previous description and will not be repeated here.

[0049] Because the rear end of the frame 1 is equipped with a screw 13, when multiple battery modules are assembled, the battery modules to be assembled later are usually located on either side of the previously assembled battery modules in the vertical direction or on either side of the width direction of the inner cavity 11. By setting the first lead-out portion 311, which is located at the top front end of the entire battery module, the first lead-out portion 311 can be regarded as the total positive or negative connection copper plate of the entire battery module, depending on the polarity of the terminal connected to the first lead-out portion 311, making it convenient for users to determine the battery arrangement and polarity distribution of the battery module. The second lead-out portion 312 protrudes and is suspended above the side wall where the long side of the battery module is located, which facilitates the assembly and arrangement of multiple battery modules along the width direction of the inner cavity 11.

[0050] It should be added that the wire hole 15 and the first lead-out portion 311 are arranged at intervals along the width direction of the inner cavity 11 to avoid interference between the control line 222 or temperature sensing line in the wired control and the first lead-out portion 311 or the external conductive structure connected to the first lead-out portion 311, thereby improving the structural rationality of the battery module.

[0051] Specifically, refer to Figure 1 As shown, the left terminal at the top of the frontmost battery body is defined as the positive terminal, and the right terminal as the negative terminal. Therefore, depending on the terminal connected to the first lead 311, the battery module has two different forms. Specifically, when the first lead 311 is connected to the positive terminal of the frontmost battery body, the battery module is a positive module, the second lead 312 is located on the right side of the frame 1, and the wired control is located at the upper right end of the front side of the frame 1. Similarly, when the first lead 311 is connected to the negative terminal of the frontmost battery body, the battery module is a negative module, the second lead 312 is located on the left side of the frame 1, and the wired control is located at the upper left end of the front side of the frame 1.

[0052] The following section uses a square battery cell body 21 with dimensions of 72mm×173mm×204mm (thickness×width×height)-280Ah (energy 896Wh) / 314Ah (energy 1004.8Wh) as an example to explain in detail the dimensions of each component of the positive module having the above-mentioned battery cell body 21.

[0053] The push plate 12 is 20mm thick, and its height is equal to the height of the battery cell body 21 plus 43mm, which is 247mm. The screw 13 is located at the center of the rear end of the mold frame 1. The screw 13 and its corresponding screw hole are M30 with a pitch of 3mm. The wire hole 15 is located on the upper right side of the front end of the frame 1 (the wire hole 15 of the negative module is on the upper left side of the front end of the frame 1). The center of the wire hole 15 is 31.5mm from the top edge of the frame 1, and the center of the wire hole 15 is 31.5mm from the side edge of the frame 1. The wire hole 15 is a square with a side length of 23mm. The center-to-center spacing of the heat dissipation holes 14 is 74mm. The center distance of the frontmost heat dissipation hole 14 from the front of the frame 1 is 58mm, the center distance of the rearmost heat dissipation hole 14 from the back of the frame 1 is 128mm, the center distance of the heat dissipation hole 14 from the top surface of the frame 1 is 146mm, and the center distance of the heat dissipation hole 14 from the bottom surface of the frame 1 is 112mm. The height of the heat dissipation hole 14 is 100mm, and the width is 36mm. The height of the inner cavity 11 of the frame 1 is equal to the height of the push plate 12, which is 247mm. The width of the inner cavity 11 of the frame 1 is equal to the width of the battery cell body 21 + 1mm = 173mm + 1mm = 174mm. The length of the inner cavity 11 of the frame 1 is equal to the thickness of the battery cell body 21 × the number of battery cell bodies 21 + the number of cooling chips 22 × the number of cooling chips 22 + the thickness of the pad + 50mm = 72 × 9mm + 2 × 10mm + 20mm + 50mm = 738mm (the number of cooling chips 22 = the number of battery cell bodies 21 + 1). Frame 1 height = 247mm + base plate thickness = 247mm + 10mm. Frame 1 width = inner cavity 11 width + side plate thickness = 174mm + 2 × 20mm = 214mm. Frame 1 length = inner cavity 11 length + side plate thickness = 738mm + 2 × 20mm = 778mm. Frame 1 has 35 M8 screw holes on its top surface, with 2mm threads. All screw holes are located at the center of frame 1. Along the width direction of inner cavity 11, the center holes of the two screw holes at the front end of frame 1 are 10mm from the outer wall of frame 1 and 97mm from the center screw. Along the length direction of inner cavity 11, the distance between the first and second screw holes at the front end of frame 1 is 48mm. The distance between the first and second screw holes at the rear end of frame 1 is 42mm. The remaining screw holes are evenly spaced at 74mm intervals.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery module, characterized by, The application relates to a battery box. The battery box comprises a box body (1) provided with an open top cavity (11), wherein one end of the cavity (11) is provided with a push plate (12) which can move along the length direction of the cavity (11); an electric cell assembly (2) is arranged between the push plate (12) and the inner wall of the box body (1), wherein the electric cell assembly (2) comprises a plurality of electric cell bodies (21) and a plurality of refrigeration sheets (22), the refrigeration sheets (22) are arranged at intervals along the length direction of the cavity (11), and a temperature control area is formed between two adjacent refrigeration sheets (22), the electric cell body (21) and the temperature control area are arranged one by one and are arranged in the temperature control area; a cover plate (3) is detachably connected with the box body (1) to close the opening of the cavity (11), and the cover plate (3) is provided with a current collection assembly (31) which is in abutment with the electric cell bodies (21) to make the electric cell bodies (21) be connected in series or parallel. One side of the box body (1) is connected with a screw rod (13) along the length direction of the cavity (11), the screw rod (13) is in threaded connection with the box body (1), one end of the screw rod (13) is located outside the cavity (11), and the other end is located inside the cavity (11) and is connected with the push plate (12). The length of the screw rod (13) is smaller than the thickness of the electric cell body (21) along the length direction of the cavity (11).

2. The battery module of claim 1, wherein, The cross section of the push plate (12) coincides with the cross section of the cavity (11) in the cross section perpendicular to the length direction of the cavity (11).

3. The battery module of claim 2, wherein, The cross section of the electric cell body (21) coincides with the cross section of the refrigeration sheet (22) in the cross section perpendicular to the length direction of the cavity (11).

4. The battery module according to any one of claims 1 to 3, characterized in that The refrigeration sheet (22) comprises a semiconductor refrigeration layer and a heating layer which are in abutment with each other, a temperature sensing wire (221) is arranged at the center of the semiconductor refrigeration layer or the heating layer, a control wire (222) is arranged at the edge of the refrigeration sheet (22), one end of the box body (1) away from the push plate (12) is provided with a wire hole (15), and the temperature sensing wires (221) and the control wires (222) of the refrigeration sheets (22) are arranged in the wire hole (15) and are connected with an external controller.

5. The battery module of any one of claims 1-3, wherein, The refrigeration sheet (22) is connected with a fire detecting tube, and the fire detecting tubes of the refrigeration sheets (22) are arranged in the wire hole (15) and are connected with an external alarm.

6. The battery module of claim 5, wherein, The current collection assembly (31) is provided with a first leading-out part (311) and a second leading-out part (312), the first leading-out part (311) is arranged along the length direction of the cavity (11) and is suspended above one end of the box body (1) away from the push plate (12), and the second leading-out part (312) is arranged along the width direction of the cavity (11) and is suspended above the box body (1).

7. The battery module of claim 6, wherein, Both sides of the box body (1) are provided with heat dissipation holes (14) along the width direction of the cavity (11), and the heat dissipation holes (14) are in communication with the cavity (11).

8. The battery module of claim 1, wherein, ​ 9. The battery module of any one of claims 1-3, wherein, ​ 10. The battery module of claim 9, wherein, The heat dissipation holes (14) are provided in multiple on each side, and the heat dissipation holes (14) and the cell main body (21) are provided one by one on the same side.

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