A battery pack and an electric device

Abstract

The utility model discloses a kind of battery pack and electrical equipment, belong to battery technical field.The length direction of the battery pack is first direction, the battery pack includes: battery cell module and end plate, the end plate is set to the end of the battery cell module along the first direction, at least two heat preservation cavities are spaced apart in the end plate along the first direction, at least two the heat preservation cavities are sequentially arranged along first direction, the first direction is the thickness direction of the end plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack and an electrical device. Background Technology

[0002] In electric vehicles, the battery pack serves as the core energy storage unit, and its performance determines the vehicle's driving range and lifespan. The battery pack comprises multiple cell modules and end plates, with the end plates connected to the ends of the cell modules, providing structural support and protection for the entire battery pack.

[0003] In actual operation, the battery pack's cell modules exhibit significant uneven temperature distribution. This is primarily because the cells in the center are surrounded by those at the edges, creating a relatively enclosed thermal environment where heat is difficult to dissipate. Meanwhile, the cells at the edges are in direct contact with the end plate, and the excellent thermal conductivity of the metal end plate allows heat from these edge cells to dissipate rapidly to the external environment. This results in a temperature difference between the cells in the center and those at the edges, affecting not only the consistency of battery performance but also accelerating the overall performance degradation of the battery pack.

[0004] In related technologies, the end plate is typically actively heated to increase its temperature and reduce heat loss from the cells located at the edges, thereby narrowing the temperature difference between the cells. However, this method requires continuous energy consumption to maintain the heating effect, making it complex to operate. Utility Model Content

[0005] This utility model discloses a battery pack and electrical equipment to solve the problem of energy consumption caused by actively heating the end plate to increase the end plate temperature and reduce heat loss of the edge cells in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] In a first aspect, this utility model discloses a battery pack, wherein the length direction of the battery pack is a first direction, and the battery pack includes: a cell module; an end plate, wherein the end plate is disposed at the end of the cell module along the first direction, and at least two heat insulation cavities are disposed at intervals along the first direction in the end plate, wherein the at least two heat insulation cavities are arranged sequentially along the first direction, and the first direction is the thickness direction of the end plate.

[0008] Optionally, the insulation cavity includes a first insulation cavity and a second insulation cavity, and the end plate includes: an end plate body having a first side and a second side disposed opposite to each other along the first direction, the first side having a first groove and the second side having a second groove; a first cover plate connected to the first side and enclosing the first groove to form the first insulation cavity; and a second cover plate connected to the second side and enclosing the second groove to form the second insulation cavity.

[0009] Optionally, the battery pack further has a second direction and a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the first groove includes a plurality of first grooves, which are arranged along the second direction in the end plate body; and / or, the second groove includes a plurality of groups of second grooves, which are arranged along the second direction in the end plate body, each group of second grooves includes a plurality of second grooves, which are arranged along the third direction.

[0010] Optionally, a buckle is provided on the second side of the end plate body, and a slot is provided on the edge of the second cover plate, and the buckle is engaged with the slot.

[0011] Optionally, a groove is provided on the first side of the end plate body, the groove extends along the second direction, the first cover plate is inserted into the groove and slidably connected with the end plate body; and / or, an annular frame is provided on the side of the first cover plate away from the end plate body, and the end of the battery cell module is embedded in the annular frame.

[0012] Optionally, the end plate body has a first through hole, which connects the first insulation cavity and the second insulation cavity; the second cover plate has a second through hole, which connects to the second insulation cavity; the battery pack further includes a pump body, which is disposed on the side of the second cover plate away from the first cover plate and connects to the second through hole; the pump body is used to deliver gas into the first insulation cavity and the second insulation cavity.

[0013] Optionally, the battery cell module includes a battery management component electrically connected to the pump body. The battery management component is used to detect the temperature difference of the battery cell module and control the pump body to deliver gas into the first insulation cavity and the second insulation cavity based on the temperature difference.

[0014] Optionally, it further includes: a first seal disposed between a first side of the end plate body and the first cover plate; and / or a second seal disposed between a second side of the end plate body and the second cover plate.

[0015] Optionally, the first groove is a rectangular structure, and the second groove is a square structure or a honeycomb structure.

[0016] A second aspect of this utility model also provides an electrical device, including the battery pack and the device body, wherein the battery pack is connected to the device body.

[0017] This utility model discloses a battery pack, wherein the length direction of the battery pack is a first direction, and the battery pack includes: a cell module; and an end plate disposed at the end of the cell module along the first direction. At least two heat-insulating cavities are spaced apart within the end plate along the first direction. The battery pack disclosed in this utility model includes a cell module and an end plate connected to the end of the cell module. At least two heat-insulating cavities are disposed within the end plate along its thickness direction. The inner heat-insulating cavity closer to the cell module can retain the heat generated by the cell module inside the battery pack; the outer heat-insulating cavity away from the cell module is closer to the external environment, which can reduce the heat loss rate of the cell module, thereby improving the temperature uniformity of the battery pack and enhancing the overall performance and lifespan of the battery module. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the structure of the battery pack described in an embodiment of the present invention;

[0019] Figure 2 This diagram illustrates the structure of the end plate described in this embodiment of the present invention. Figure 1 ;

[0020] Figure 3 This indicates the explosion of the end plate described in the embodiment of this utility model. Figure 1 ;

[0021] Figure 4 This indicates the explosion of the end plate described in the embodiment of this utility model. Figure 2 ;

[0022] Figure 5 This diagram illustrates the structure of the end plate described in this embodiment of the present invention. Figure 2 .

[0023] Figure label:

[0024] 1. Battery cell module; 11. Battery management components;

[0025] 2. End plate; 21. End plate body; 211. First groove; 212. Second groove; 213. Buckle; 214. First through hole; 22. First cover plate; 23. Second cover plate; 231. Slot; 232. Second through hole;

[0026] 3. Insulation cavity; 31. First insulation cavity; 32. Second insulation cavity;

[0027] 4. Pump body;

[0028] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the fixed scope of the present utility model.

[0030] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0032] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the present invention.

[0033] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0034] This utility model discloses a battery pack having a first direction X, where X is the length direction of the battery pack. For example... Figure 1As shown, the battery pack includes a cell module 1 and an end plate 2. The length direction of the cell module 1 is the same as the length direction of the battery pack, and the thickness direction of the end plate 2 is the same as the first direction X. The end plate 2 is disposed at the end of the cell module 1 along the first direction X. At least two heat insulation cavities 3 are disposed at intervals along the first direction X in the end plate 2. That is, at least two heat insulation cavities 3 are sequentially disposed in the end plate 2 along the first direction X.

[0035] In this embodiment, the battery pack includes a cell module 1 and an end plate 2 connected to the end of the cell module 1. The end plate 2 is provided with at least two heat preservation cavities 3, which are arranged sequentially along the first direction X, that is, the thickness direction of the end plate 2.

[0036] For example, along the first direction X, two, three, four, five, or six heat-insulating cavities 3 can be sequentially arranged inside the end plate 2. In this embodiment, the specific number of heat-insulating cavities 3 is not limited. In practical applications, technicians can set the specific number of heat-insulating cavities 3 as needed.

[0037] It should be noted that the insulation cavity 3 in this embodiment is a sealed cavity filled with air, utilizing the low thermal conductivity of air to achieve heat insulation. In specific applications, the inner insulation cavity 3 near the cell module 1 can block heat transfer to the outside, retaining the heat generated by the cell module 1 during operation within the battery pack, thereby maintaining the temperature stability of the cell module during operation and ensuring that the cell module 1 is at a suitable temperature during operation. The outer insulation cavity 3, facing away from the cell module 1, faces the external environment, slowing down the rate of heat loss from the inside to the outside environment, especially reducing heat loss from the battery pack in low-temperature environments, thereby improving the temperature uniformity of the battery pack and enhancing the reliability of the battery pack during operation.

[0038] Furthermore, in this embodiment, the stacked arrangement of multiple insulation cavities 3 enables the end plate 2 to form at least two insulation layers along the first direction X. This not only improves the overall insulation performance of the end plate 2, but also helps to improve the uniformity of the internal temperature of the battery pack, reduce local overheating or overcooling of the battery cell, thereby improving the working efficiency and cycle life of the battery cell module 1.

[0039] In some embodiments, such as Figures 2-4As shown, the insulation cavity 3 includes a first insulation cavity 31 and a second insulation cavity 32. The end plate 2 includes an end plate body 21, a first cover plate 22 and a second cover plate 23. The end plate body 21 has a first side and a second side disposed opposite to each other along the first direction X. The first side is provided with a first groove 211 and the second side is provided with a second groove 212. The first cover plate 22 is connected to the first side and surrounds the first groove 211 to form the first insulation cavity 31. The second cover plate 23 is connected to the second side and surrounds the second groove 212 to form the second insulation cavity 32.

[0040] In this embodiment, the heat insulation cavity 3 includes a first heat insulation cavity 31 and a second heat insulation cavity 32, and the end plate 2 includes an end plate body 21, a first cover plate 22, and a second cover plate 23. The end plate body 21 has a first side and a second side arranged opposite to each other along a first direction X, with the first side facing the battery module 1. A first groove 211 is formed on the first side, and the first cover plate 22 is connected to the opening of the first groove 211 on the first side of the end plate body 21, so that the first cover plate 22 and the first groove 211 on the first side of the end plate body 21 can enclose and form a sealed first heat insulation cavity 31. Exemplarily, the first groove 211 may include multiple grooves, and the multiple first grooves 211 and the first cover plate 22 enclose and form multiple spaced heat insulation cavities.

[0041] The second side of the end plate body 21 faces the external environment, and a second groove 212 is provided on the second side of the end plate body 21. The second cover plate 23 is connected to the opening of the second groove 212 on the second side of the end plate body 21, so that the second cover plate 23 and the second groove 212 on the second side of the end plate body 21 can be enclosed to form a sealed second heat-insulating cavity 32. For example, the second groove 212 may include multiple grooves, and multiple grooves 212 and the second cover plate 23 enclose multiple heat-insulating cavities that are spaced apart.

[0042] Furthermore, the first insulation cavity 31, as an inner heat insulation barrier, can lock in the heat generated by the cell and reduce the heat loss to the outside of the end plate 2; the second insulation cavity 32 further blocks the heat from being conducted to the external environment through the end plate 2, which can reduce the overall heat loss of the battery pack, especially in low temperature environments.

[0043] It should be noted that the end plate body 21, the first cover plate 22, and the second cover plate 23 can be made of aluminum alloy to reduce the overall weight of the battery pack while ensuring its strength. Alternatively, the end plate body 21, the first cover plate 22, and the second cover plate 23 can also be made of plastic to further reduce the thermal conductivity of the end plate 2.

[0044] The end plate body 21 can be connected to the first cover plate 22 and the second cover plate 23 by means of laser welding, sealing adhesive, or bolt tightening to ensure the airtightness and mechanical strength of the first insulation cavity 31 and the second insulation cavity 32. Of course, the above are only individual examples of specific connection methods between the end plate body 21 and the first cover plate 22 and the second cover plate 23, and are not intended to limit this application. In practical applications, those skilled in the art can also choose appropriate connection methods as needed.

[0045] In some embodiments, such as Figure 3 As shown, the battery pack also has a second direction Y and a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. Multiple first grooves 211 are included, arranged along the second direction Y within the end plate body 21; and / or, multiple sets of second grooves 212 are included, arranged along the second direction Y within the end plate body 21, with each set of second grooves 212 including multiple second grooves, arranged along the third direction Z.

[0046] In this embodiment, the battery pack also has a second direction Y and a third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other and together form a spatial coordinate system.

[0047] For example, the second direction Y can be the width direction of the battery pack, and the third direction Z can be the height direction of the battery pack. Alternatively, the second direction Y can be the height direction of the battery cells, and the third direction Z can be the width direction of the battery pack.

[0048] The following will use the second direction Y as the width direction of the battery pack and the third direction Z as the height direction of the battery pack as an example to explain this application.

[0049] Inside the end plate body 21, multiple first grooves 211 can be provided and arranged sequentially along the second direction Y. For example, 8, 9, 10, 11, 12, or 13 first grooves 211 can be sequentially provided along the second direction Y on the first side of the end plate body 21. This embodiment of the application does not impose specific limitations on this; in practical applications, those skilled in the art can set the specific number of first grooves 211 as needed.

[0050] In other embodiments, the second groove 212 may be designed as multiple groups, with multiple groups of second grooves 212 arranged sequentially along the second direction Y within the second side of the end plate body 21, and each group including multiple second grooves 212 arranged sequentially along the third direction Z. For example, 8, 9, 10, 11, 12, or 13 groups of second grooves 212 are sequentially provided along the second direction Y within the second side of the end plate body 21, with each group 212 including 2, 3, or 4 second grooves arranged sequentially along the third direction Z.

[0051] The differentiated layout of this groove arrangement is determined based on the different heat insulation requirements of the first and second sides of the end plate body 21. Specifically, the first side of the end plate body 21 that is close to the cell module 1 usually needs uniform heat insulation, so multiple first grooves 211 are arranged in parallel along the second direction Y to form a continuous and stable air insulation layer in the second direction Y; while the second side of the end plate body 21 that is away from the cell module 1 faces the external environment, so the second grooves 212 are arranged in an array along the second direction Y and the third direction Z, which can further improve the heat insulation capability of the second insulation cavity 32 in the third direction Z.

[0052] In addition, in order to provide grooves on the first and second sides of the end plate body 21, partitions made of metal or engineering plastic can be provided at intervals on the first and second sides of the end plate body 21. The partitions are connected to the bottom surface and side wall of the end plate body 21 by welding, insert injection molding or threaded connection, so that the partitions and the bottom of the end plate body 21 enclose to form a first groove 211 or a second groove 212.

[0053] In some embodiments, the first groove 211 is configured as a rectangular structure, and the second groove 212 is configured as a square structure or a honeycomb structure.

[0054] For example, multiple partitions are provided along the third direction Z on the first side of the end plate body 21, and the multiple partitions are arranged at intervals along the second direction Y to divide the first side of the end plate body 21 into multiple first grooves 211 with rectangular structures. Alternatively, multiple partitions can be provided on the second side of the end plate body 21, intersecting each other along the third direction Z and the second direction Y, to divide the second side of the end plate body 21 into multiple second grooves 212 with square structures. Furthermore, several identical partitions can be spliced ​​together on the second side of the end plate body 21 to form a honeycomb structure, thereby dividing the second side of the end plate body 21 into second grooves 212 with honeycomb structures.

[0055] In some embodiments, a buckle 213 is provided on the second side of the end plate body 21, and a slot 231 is provided on the edge of the second cover plate 23, with the buckle 213 engaging with the slot 231.

[0056] In this embodiment, as Figure 4 As shown, the second sidewall of the end plate body 21 is provided with multiple buckles 213, and the edge of the second cover plate 23 is provided with multiple slots 231. The buckles 213 are square in shape, and their shapes match the slots 231. The size of the buckles 213 is slightly larger than the opening of the slots 231. When installing the second cover plate 23, the buckles 213 are pressed into the slots 231 to achieve a snap-fit ​​fixation between the second sidewall of the end plate body 21 and the second cover plate 23.

[0057] The buckle 213 and the second cover plate 23 can be made of plastic. The buckle 213 and the slot 231 are locked together using the elastic deformation of the plastic itself. Assembly is convenient, requiring no welding, gluing, or additional fasteners, thus improving production efficiency and reducing costs. Furthermore, because the connection between the buckle 213 and the slot 231 has a certain degree of mobility, it can provide appropriate displacement tolerance when the battery pack undergoes slight deformation during charging and discharging, helping to release internal stress and improve the structural reliability of the battery pack.

[0058] In some embodiments, a sliding groove is provided on the first side of the end plate body 21, the sliding groove extends along the second direction Y, and the first cover plate 22 is inserted into the sliding groove and slidably connected to the end plate body 21.

[0059] In this embodiment, a sliding groove is provided on the first side of the end plate body 21. The sliding groove extends along the second direction Y, and the groove openings are positioned opposite each other along the third direction Z. The first cover plate 22 is inserted into the sliding groove along its two sides along the second direction Y, thereby achieving a sliding connection between the first cover plate 22 and the first side of the end plate body 21. This assembly operation is simple and intuitive, enabling rapid positioning and alignment, and improving production assembly efficiency. In addition, after the first cover plate 22 is slidably positioned on the second side of the end plate body 21, final fastening can be achieved by methods such as applying adhesive, welding, or installing end fasteners to improve the stability of the end plate 2 structure and meet sealing requirements.

[0060] In other embodiments, an annular frame is provided on the side of the first cover plate 22 away from the end plate body 21, and the end of the battery cell module 1 is embedded in the annular frame. Specifically, an annular frame is provided on the side of the first cover plate 22 away from the end plate body 21 (i.e., the side facing the battery cell module 1). The annular frame protrudes from the surface of the first cover plate 22 along the first direction X towards the battery cell module 1, and its inner contour shape matches the end sidewall of the battery cell module 1, so that the end of the battery cell module 1 can be fitted into the annular frame, realizing the connection between the end of the battery cell module 1 and the first cover plate 22, thereby realizing the assembly of the battery cell module 1 and the end plate 2.

[0061] In addition, a buffer material can be filled between the annular frame and the cell module 1 to further improve the thermal insulation performance of the end plate 2. The buffer material can be silicone foam or aerogel felt. Taking silicone foam as an example, it possesses excellent elastic recovery and high / low temperature resistance, providing continuous buffer stress during the volume expansion generated by the cell's charge-discharge cycles, preventing mechanical fatigue damage. Simultaneously, its closed-cell structure gives it low thermal conductivity, effectively blocking heat exchange between the cell module 1 and the external environment, reducing heat loss under extreme temperature conditions. Aerogel felt, as a nanoporous material, also has low thermal conductivity, achieving excellent thermal insulation even with a very thin thickness. This embodiment improves the overall rigidity and shock resistance of the end plate 2 by filling the gap between the end of the cell module 1 and the annular frame with buffer material. More importantly, it constructs a thermal isolation barrier, reducing internal temperature fluctuations in the battery pack and helping to improve the uniformity of the internal temperature of the battery pack.

[0062] In addition, the ring frame can be made of plastic. Since the end of the battery cell module 1 needs to be embedded in the ring frame, when the ring frame has a moderate elastic deformation capability, it can buffer the expansion pressure generated by the battery cell module 1 during charging and discharging, thereby improving the stability and safety performance of the battery cell module 1.

[0063] In some embodiments, such as Figure 5 As shown, the end plate body 21 has a first through hole 214, which connects the first insulation cavity 31 and the second insulation cavity 32; the second cover plate 23 has a second through hole 232, which connects to the second insulation cavity 32. The battery pack also includes a pump body 4, which is located on the side of the second cover plate 23 away from the first cover plate 22 and connects to the second through hole 232. The pump body 4 is used to deliver gas into the first insulation cavity 31 and the second insulation cavity 32.

[0064] In this embodiment, a first through hole 214 is provided on the end plate body 21, which penetrates the end plate body 21 along a first direction, allowing the first insulation cavity 31 and the second insulation cavity 32 to communicate with each other. Simultaneously, a second through hole 232 is provided on the second cover plate 23, which communicates with the second insulation cavity 32. The battery pack is also equipped with a pump body 4, which is installed on the outside of the second cover plate 23 and connected to the second through hole 232. The pump body 4 is used to pump gas into the first insulation cavity 31 and the second insulation cavity 32.

[0065] In practical applications, when air or other gases are injected into the first insulation cavity 31 and the second insulation cavity 32 via the pump body 4, the gas density within the first insulation cavity 31 and the second insulation cavity 32 is increased. As the gas density within the first insulation cavity 31 and the second insulation cavity 32 increases, collisions between gas molecules become more frequent, which can suppress heat convection and weaken heat conduction, thereby improving the thermal insulation performance of the first insulation cavity 31 and the second insulation cavity 32. Especially in low-temperature environments, increasing the gas density within the first insulation cavity 31 and the second insulation cavity 32 can suppress heat convection and weaken heat conduction, thereby enhancing thermal insulation performance, reducing heat loss from the battery pack, and improving the temperature uniformity of the cell module 1 within the battery pack.

[0066] Pump body 4 can be a small pneumatic pump such as a miniature diaphragm pump or a low-noise oil-free piston pump. These pumps are compact, easy to integrate, and can provide stable airflow and controllable pressure. It is important to note that the pumped air must be dried. Specifically, a drying ball can be added to the connecting air pipe between the air outlet of pump body 4 and the second through hole 232. The drying ball is filled with a drying material such as activated alumina or molecular sieves. After the air output from pump body 4 flows through the drying ball, moisture can be effectively removed, preventing moisture from entering the insulation cavity 3 and causing condensation, thereby preventing corrosion of the end plate 2 and the battery module 1.

[0067] In some embodiments, the battery cell module 1 includes a battery management unit 11, which is electrically connected to the pump body 4. The battery management unit 11 is used to detect the temperature difference of the battery cell module 1 and control the pump body 4 to deliver gas into the first insulation chamber 31 and the second insulation chamber 32 based on the temperature difference.

[0068] In this embodiment, the battery cell module 1 also includes a battery management component 11. The battery management component 11 can detect the temperature distribution and temperature difference inside the battery cell module 1 in real time. The battery management component 11 is electrically connected to the pump body 4 and can control the pump body 4 to deliver gas to the heat preservation cavity 3 based on the temperature difference.

[0069] In specific applications, the battery management component 11 includes a temperature sensor and a control component. The temperature sensor is electrically connected to the control component. The temperature sensor can be located at the cells in the middle, at the cells at the edge, or outside the battery pack to detect the temperature of the external environment. The temperature sensor continuously acquires the temperature of each cell and the external environment and feeds the temperature back to the control component. The control component receives the temperature collected by the temperature sensor and calculates the temperature difference. When the control component detects that the temperature difference between the cells is too large or the external environment temperature is too low, the control component sends a command to the pump body 4 to start working. After being controlled, the pump body 4 pumps dry gas into the insulation cavity 3 through the second through hole 232 to enhance its heat insulation performance by increasing the air density in the insulation cavity 3, thereby suppressing the heat loss from the inside of the battery pack and promoting the uniform temperature distribution of the cell module 1.

[0070] In some embodiments, the device further includes: a first seal disposed between a first side of the end plate body 21 and a first cover plate 22; and / or a second seal disposed between a second side of the end plate body 21 and a second cover plate 23.

[0071] In this embodiment, the battery pack further includes a first seal and / or a second seal. The first seal is disposed at the interface between the first side of the end plate body 21 and the first cover plate 22, and the second seal is disposed at the interface between the second side of the end plate body 21 and the second cover plate 23. The first and second seals can be O-rings or gaskets made of aging-resistant, highly elastic silicone or rubber, etc., to utilize the elastic deformation of the seals under pressure to fill the microscopic assembly gaps between the end plate body 21 and the first cover plate 22 or the second cover plate 23, thereby further improving the airtightness of the first insulation cavity 31 and the second insulation cavity 32. Furthermore, during installation, care should be taken to ensure that the seals are evenly compressed to avoid localized twisting or damage, ensuring the integrity and durability of the sealing effect.

[0072] In addition, the advantages of setting the first and second seals are that they can effectively prevent external humid air, dust or corrosive gas from entering the insulation cavity 3, ensuring the purity of the dry air in the insulation cavity 3 and stable heat insulation performance; at the same time, for the aforementioned embodiment with pump body 4 for pressurization, the seals can also maintain the gas pressure in the insulation cavity 3, prevent pressure leakage, and avoid the decrease in heat insulation performance due to pressure loss.

[0073] This application also provides an electrical device, including a battery pack and an electrical device body, wherein the battery pack is connected to the electrical device body.

[0074] In this embodiment, the electrical device includes the battery pack and the device body as described in the previous embodiments. The battery pack is connected and installed on the device body as a power supply unit and provides the necessary electrical energy for its normal operation. The electrical device here includes, but is not limited to, electric vehicles, electric bicycles, drones, portable energy storage power supplies, power tools, or various consumer electronics products.

[0075] It should be noted that the battery pack included in the electrical equipment disclosed in this application embodiment has the same structure as the battery pack described in the above embodiment, and its beneficial effects are also similar, so it will not be repeated here.

[0076] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized in that, The length direction of the battery pack is a first direction (X), and the battery pack includes: Battery cell module (1); End plate (2), the end plate (2) is disposed at the end of the battery cell module (1) along the first direction, and at least two heat preservation cavities (3) are disposed in the end plate (2) along the first direction (X) at intervals.

2. The battery pack according to claim 1, characterized in that, The heat insulation cavity (3) includes a first heat insulation cavity (31) and a second heat insulation cavity (32); The end plate (2) includes: End plate body (21), the end plate body (21) has a first side and a second side disposed opposite to each other along the first direction (X), the first side is provided with a first groove (211), and the second side is provided with a second groove (212). The first cover plate (22) is connected to the first side and surrounds the first groove (211) to form the first heat preservation cavity (31). The second cover plate (23) is connected to the second side and surrounds the second groove (212) to form the second heat preservation cavity (32).

3. The battery pack according to claim 2, characterized in that, The battery pack also has a second direction (Y) and a third direction (Z), wherein the first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other; The first groove (211) includes a plurality of first grooves (211), and the plurality of first grooves (211) are arranged in the end plate body (21) along the second direction (Y); And / or, the second groove (212) includes multiple sets, and multiple sets of the second groove (212) are arranged in the end plate body (21) along the second direction (Y). Each set of the second groove (212) includes multiple sets, and multiple sets of the second groove (212) are arranged along the third direction (Z).

4. The battery pack according to claim 2, characterized in that, The second side of the end plate body (21) is provided with a buckle (213), and the edge of the second cover plate (23) is provided with a slot (231), and the buckle (213) is engaged with the slot (231).

5. The battery pack according to claim 4, characterized in that, The battery pack also has a second direction (Y), which is perpendicular to the first direction (X). The end plate body (21) has a sliding groove on its first side, the sliding groove extends along the second direction (Y), and the first cover plate (22) is inserted into the sliding groove and is slidably connected to the end plate body (21); And / or, The first cover plate (22) has an annular frame on the side away from the end plate body (21), and the end of the battery cell module (1) is embedded in the annular frame.

6. The battery pack according to claim 2, characterized in that, The end plate body (21) is provided with a first through hole (214), which connects the first heat preservation cavity (31) and the second heat preservation cavity (32). The second cover plate (23) has a second through hole (232), which communicates with the second insulation cavity (32). The battery pack also includes: Pump body (4), the pump body (4) is disposed on the side of the second cover plate (23) away from the first cover plate (22) and communicates with the second through hole (232), the pump body (4) is used to deliver gas into the first heat preservation cavity (31) and the second heat preservation cavity (32).

7. The battery pack according to claim 6, characterized in that, The battery cell module (1) includes a battery management component (11). The battery management unit (11) is electrically connected to the pump body (4). The battery management unit (11) is used to detect the temperature difference of the battery cell module (1) and control the pump body (4) to deliver gas into the first heat preservation cavity (31) and the second heat preservation cavity (32) based on the temperature difference.

8. The battery pack according to claim 4, characterized in that, Also includes: The first sealing element is disposed between the first side of the end plate body (21) and the first cover plate (22); And / or, The second seal is disposed between the second side of the end plate body (21) and the second cover plate (23).

9. The battery pack according to claim 3, characterized in that, The first groove (211) is a rectangular structure, and the second groove (212) is a square structure or a honeycomb structure.

10. An electrical appliance, characterized in that, It includes a battery pack as described in any one of claims 1-9 and an electrical device body, wherein the battery pack is connected to the electrical device body.

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