Battery tray, battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery tray, a battery pack and electric equipment, and belongs to the technical field of batteries. The battery tray comprises a tray body used for accommodating a battery cell; the pressure applying assembly is arranged in the tray body, and the pressure applying assembly is provided with a cavity; and the pressure regulating assembly is provided with a first pressure cavity and a second pressure cavity which are variable in volume, the sum of the volume of the first pressure cavity and the volume of the second pressure cavity is fixed, and the first pressure cavity is communicated with the cavity, so that the second medium in the first pressure cavity applies pressure to the battery cell through the cavity. Two media with different expansibility are combined, and pressure control is achieved, so that pressure control is more convenient.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery tray, battery pack and electrical equipment. Background Technology

[0002] In batteries, applying a certain pressure to the cell can improve the cell's discharge capacity and effectively suppress cell expansion.

[0003] In the prior art, a pressure-applying component is installed inside the battery tray, the pressure-applying component is slidably engaged with the tray, and the pressure-applying component is connected to the piston of a hydraulic cylinder. The piston of the hydraulic cylinder can apply pressure to the pressure-applying component to drive the pressure-applying component to move relative to the tray, and further apply pressure to the battery cells inside the tray.

[0004] However, this tray design can lead to poor voltage regulation due to the pressure structure of the battery tray. Summary of the Invention

[0005] This application provides a battery tray, a battery pack, and an electrical device to solve the problem of poor voltage regulation effect of the pressure structure in the existing battery tray.

[0006] In a first aspect, embodiments of this application provide a battery tray, comprising:

[0007] The tray body is used to hold the battery cells;

[0008] A pressure application component is disposed within the tray body and has a cavity.

[0009] The pressure regulating component has a first pressure chamber and a second pressure chamber with variable volumes. The sum of the volumes of the first pressure chamber and the second pressure chamber is constant. The first pressure chamber is used to fill a first medium, and the second pressure chamber is used to fill a second medium. The expansion property of the first medium is less than that of the second medium.

[0010] The first pressure chamber is connected to the cavity body so that the first medium in the first pressure chamber applies pressure to the battery cell through the cavity body.

[0011] In one possible implementation, the battery tray provided in this application embodiment includes a voltage regulating component comprising:

[0012] The box body is connected to the pallet body;

[0013] The piston is movable inside the housing and divides the internal space of the housing to form a first pressure chamber and a second pressure chamber.

[0014] The piston slides relative to the housing, causing a relative change in the volume of the first and second pressure chambers.

[0015] In one possible implementation, the battery tray provided in this application embodiment has a piston slidably disposed within the housing, and the piston includes:

[0016] Sliding block, the sliding block slides in conjunction with the housing;

[0017] A sealing ring is fitted around the periphery of the sliding block and seals the outer wall of the sliding block and the inner wall of the housing.

[0018] In one possible implementation, the battery tray provided in this application embodiment has a sliding block with a dimension greater than or equal to 30 mm and less than or equal to 50 mm along its own sliding direction.

[0019] In one possible implementation, the battery tray provided in this application embodiment further includes:

[0020] A pressure detection device is used to detect the pressure inside the second pressure chamber.

[0021] A pressure regulating component is connected to the housing and communicates with the second pressure chamber to drive the volume of the second pressure chamber to increase or decrease.

[0022] The controller is electrically connected to the air pressure detection device and the air pressure regulating device;

[0023] The controller is configured to, when the pressure inside the second pressure chamber is determined by the pressure detector to be lower than the preset pressure, control the pressure regulator to drive the volume of the second pressure chamber to increase accordingly, so as to increase the pressure of the first pressure chamber and the cavity body accordingly; and, when the pressure inside the second pressure chamber is determined by the pressure detector to be higher than the preset pressure, control the pressure regulator to drive the volume of the second pressure chamber to decrease accordingly, so as to decrease the pressure of the first pressure chamber and the cavity body accordingly.

[0024] In one possible implementation, the battery tray provided in this application embodiment includes a pressure application component comprising a first pressure application member, wherein a plurality of first pressure application members are provided, and the plurality of first pressure application members are sequentially and spaced apart from each other on the tray body, and the cavities of each first pressure application member are interconnected.

[0025] A receiving groove is formed between two adjacent first pressure-applying components, and the receiving groove is used to accommodate the battery cell.

[0026] In one possible implementation, the battery tray provided in this application embodiment has a communicating cavity inside the tray body, the communicating cavity communicating with the first pressure cavity and the cavities of each first pressure-applying member.

[0027] In one possible implementation, the battery tray provided in this application embodiment includes a base plate, a communicating cavity located within the base plate, and the rigidity of the base plate is greater than the rigidity of the first pressure-applying member.

[0028] In one possible implementation, the battery tray provided in this application embodiment further includes multiple connecting pipes, each of which is connected to the cavity of two adjacent first pressure-applying components.

[0029] In one possible implementation, the battery tray provided in this application embodiment has a flexible connecting tube.

[0030] In one possible implementation, the battery tray provided in this application embodiment further includes a top cover and a side plate. The side plate is disposed on a bottom plate, and the top cover is disposed on the side of the first pressure member away from the bottom plate and connects the side plate and each of the first pressure members.

[0031] In one possible implementation, the battery tray provided in this application embodiment includes a pressure application component including a second pressure application member, and at least one pressure regulating component is provided, with the second pressure application member and the pressure regulating component being provided in a one-to-one correspondence;

[0032] The second pressure-applying component is slidably connected to the tray body and is used to apply pressure to the outermost cell among the cells.

[0033] In one possible implementation, the battery tray provided in this application embodiment has two second pressure-applying members, which are respectively located on opposite sides of the tray body along the cell stacking direction.

[0034] In one possible implementation, the battery tray provided in this application embodiment has a variable cavity volume for the second pressure member along the sliding direction of the second pressure member.

[0035] In one possible implementation, the battery tray provided in this application includes a base plate and a side plate. The side plate is disposed on the base plate, and a guide portion is provided on at least one of the base plate and the side plate. A sliding portion is provided on the second pressure member, and the sliding portion is slidably connected to the guide portion.

[0036] In one possible implementation, the battery tray provided in this application embodiment further includes multiple pads, which are respectively used to be disposed between two adjacent battery cells and to abut against the battery cells.

[0037] In one possible implementation, the area of ​​the surface on the pressure-applying component of the battery tray provided in this application embodiment for applying pressure to the battery cell is larger than the area of ​​the surface of the battery cell under pressure.

[0038] Secondly, embodiments of this application provide a battery pack, including a battery module and the aforementioned battery tray, wherein the battery module is disposed within the battery tray.

[0039] Thirdly, embodiments of this application provide an electrical device, including a device body and the aforementioned battery tray disposed on the device body; or, including a device body and the aforementioned battery pack disposed on the device body.

[0040] The battery tray, battery pack, and electrical device provided in this application embodiment include a tray body and a pressure-applying component and a voltage-regulating component disposed on the tray body. The voltage-regulating component has a first pressure chamber and a second pressure chamber with a fixed sum of volumes but variable relative volumes. The first pressure chamber is connected to the cavity of the pressure-applying component, and the pressure-applying component can abut against the battery cells contained in the tray body. The first pressure chamber can be filled with a first medium, and the second pressure chamber can be filled with a second medium. The expansion property of the first medium is less than that of the second medium. By injecting or discharging the second medium into the second pressure chamber, or by heating or cooling the second medium in the second pressure chamber, the volume of the second pressure chamber can be increased or decreased accordingly, and the volume of the first pressure chamber relative to the volume of the second pressure chamber can be decreased or increased accordingly. When the volume of the second pressure chamber increases, the volume of the first pressure chamber decreases. Since the total amount of the first medium in the first pressure chamber and the cavity remains unchanged, the pressure of the first medium in the first pressure chamber and the cavity increases, thereby increasing the pressure applied to the battery cells by the pressure-applying component. Conversely, when the volume of the second pressure chamber decreases, the pressure of the first pressure chamber and the first medium within it decreases, thereby reducing the pressure applied to the battery cell by the pressure-applying component, making pressure control simpler. Compared to the prior art where a piston in a piston cylinder pushes the pressure-applying component to apply rigid pressure to the battery cell under hydraulic action, which is not easy to adapt to the expansion changes of the battery cell, this application combines different expansive media. Since the second medium is more easily compressed and expanded than the first medium, when the battery cell expands or is under pressure, the volume change of the second medium can buffer or even absorb this pressure change, ensuring that the first medium always applies stable pressure to the battery cell, forming dynamic adjustment of the applied pressure and improving the pressure regulation effect. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0042] Figure 1 A schematic diagram of the structure of the battery tray provided in the embodiments of this application. Figure 1 ;

[0043] Figure 2 for Figure 1 A schematic diagram showing the interaction between the battery tray and the battery cell;

[0044] Figure 3 for Figure 1 A schematic diagram of the structure of the first pressure chamber, the connecting chamber, and the cavity body of the battery tray;

[0045] Figure 4 for Figure 2 Schematic diagram of the piston structure;

[0046] Figure 5 for Figure 1 Schematic diagram of the sealing structure of the injection port;

[0047] Figure 6 for Figure 2 Schematic diagram of the connection between the upper and middle covers and the pressure application components;

[0048] Figure 7 for Figure 1 A schematic diagram of the battery tray structure and connecting pipe;

[0049] Figure 8 A schematic diagram of the structure of the battery tray provided in the embodiments of this application. Figure 2 ;

[0050] Figure 9 for Figure 8 A schematic diagram showing the connection between the pressure-applying component and the tray body.

[0051] Explanation of reference numerals in the attached figures:

[0052] 100 - Pallet body; 110 - Bottom plate; 111 - Communicating cavity; 120 - Side plate; 121 - Guide section; 130 - Top cover;

[0053] 200 - Pressure application component; 210 - First pressure application element; 211 - Receiving groove; 220 - Second pressure application element; 221 - Telescopic box; 222 - Sliding part; 230 - Cavity;

[0054] 300-Pressure regulating assembly; 310-Box body; 311-First pressure chamber; 312-Second pressure chamber; 313-Injection port; 3131-Sealing ring; 3132-Gland; 320-Piston; 321-Sliding block; 322-Sealing ring;

[0055] 400-Connecting pipe;

[0056] 500-Plate;

[0057] 600-cell.

[0058] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features can be combined with each other.

[0060] In the prior art, a pressure-applying component is provided inside the battery tray. The pressure-applying component slides with the tray and is connected to the piston of a hydraulic cylinder. When the piston moves, pressure can be applied to the pressure-applying component to drive it to move relative to the tray and further apply pressure to the battery cells inside the tray.

[0061] However, because the pressure-applying component is driven by a hydraulic cylinder to apply rigid pressure, it is not easy to adapt to changes in the internal pressure of the battery cell, resulting in poor voltage regulation.

[0062] To overcome the deficiencies in the prior art, this application provides a battery tray, a battery, and an electrical device. The battery tray includes a tray body and a pressure-applying component and a voltage-regulating component disposed on the tray body. The voltage-regulating component has a first pressure chamber and a second pressure chamber with a fixed sum of volumes but variable relative volumes. The first pressure chamber is connected to the cavity of the pressure-applying component, and the pressure-applying component can abut against the battery cell contained in the tray body. The first pressure chamber can be filled with a first medium, and the second pressure chamber can be filled with a second medium. The expansion property of the first medium is less than that of the second medium. By injecting or discharging the second medium into the second pressure chamber, or by heating or cooling the second medium in the second pressure chamber, the volume of the second pressure chamber can be increased or decreased accordingly, and the volume of the first pressure chamber relative to the volume of the second pressure chamber can be decreased or increased accordingly. When the volume of the second pressure chamber increases, the volume of the first pressure chamber decreases. Since the total amount of the first medium in the first pressure chamber and its cavity remains unchanged, the pressure of the first medium in the first pressure chamber and its cavity increases, thereby increasing the pressure applied to the battery cell by the pressure-applying component. Conversely, when the volume of the second pressure chamber decreases, the pressure of the first pressure chamber and the first medium within it decreases, thereby reducing the pressure applied to the battery cell by the pressure-applying component, making pressure control simpler. Compared to the prior art where a piston in a piston cylinder pushes the pressure-applying component to apply rigid pressure to the battery cell under hydraulic action, which is not easy to adapt to the expansion changes of the battery cell, this application combines different expansive media. Since the second medium is more easily compressed and expanded than the first medium, when the battery cell expands or is under pressure, the volume change of the second medium can buffer or even absorb this pressure change, ensuring that the first medium always applies stable pressure to the battery cell, forming dynamic adjustment of the applied pressure and improving the pressure regulation effect.

[0063] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0064] In some embodiments, refer to Figures 1 to 3 ,as well as Figure 8 As shown, this application embodiment provides a battery tray, including:

[0065] Tray body 100, tray body 100 is used to hold battery cell 600;

[0066] Pressure application component 200 is disposed within tray body 100 and has cavity 230;

[0067] The pressure regulating component 300 has a first pressure chamber 311 and a second pressure chamber 312 with variable volumes. The sum of the volumes of the first pressure chamber 311 and the second pressure chamber 312 is constant. The first pressure chamber 311 is used to fill a first medium, and the second pressure chamber 312 is used to fill a second medium. The expansion property of the first medium is less than that of the second medium.

[0068] The first pressure chamber 311 is connected to the cavity 230 so that the first medium in the first pressure chamber 311 applies pressure to the cell 600 through the cavity 230.

[0069] The tray body 100 forms a receiving space for accommodating the battery cell 600. The voltage regulating component 300 is connected to the tray body 100 and located outside the receiving space. The pressure applying component 200 is disposed inside the receiving space and connected to the voltage regulating component 300.

[0070] The pressure regulating component 300 has a first pressure chamber 311 and a second pressure chamber 312. The volumes of the first pressure chamber 311 and the second pressure chamber 312 are relatively variable, and the sum of the volumes of the first pressure chamber 311 and the second pressure chamber 312 is constant. Thus, when the volume of the second pressure chamber 312 increases, the volume of the first pressure chamber 311 decreases accordingly, and when the volume of the second pressure chamber 312 decreases, the volume of the first pressure chamber 311 increases accordingly.

[0071] The expansion property of the first medium is less than that of the second medium. The second medium, specifically a gas such as nitrogen or other inert gases, is filled into the second pressure chamber 312. Its chemical properties are relatively stable, which can improve the safety performance of the battery. The first medium, specifically a liquid such as a mixture of water, oil, or ethylene glycol, isostatic media, is filled into the first pressure chamber 311. When the liquid fills the first pressure chamber 311, since the first pressure chamber 311 is also connected to the cavity 230 of the pressure application component 200, the liquid will further fill into the cavity 230. This facilitates the first pressure chamber 311 applying pressure to the cell 600 through the cavity 230 via the pressure application component 200, placing the cell 600 in a near-isostatic pressure environment. This ensures that the cell 600 receives uniform pressure, improving the charging and discharging effect of the cell 600, stabilizing and suppressing the expansion of the cell 600, and extending the service life of the cell 600. The following description uses a liquid as the first medium and a gas as the second medium to illustrate this application.

[0072] Furthermore, when the volume of the first pressure chamber 311 decreases, due to the low expansibility of the liquid filling the first pressure chamber 311 and the cavity 230, the liquid will push the cavity 230 outward, causing the pressure-applying component 200 to expand outward and thus apply pressure to the battery cell 600. Conversely, when the volume of the first pressure chamber 311 decreases, the pushing effect of the liquid on the cavity 230 weakens, causing the pressure-applying component 200 to expand less and thus reducing the pressure applied to the battery cell 600.

[0073] It should be noted that, in order to facilitate the application of pressure from the first pressure chamber 311 to the cell 600 via the cavity 230, to prevent the first pressure chamber 311 from rupturing due to excessive pressure, or to prevent the liquid from failing to expand due to the need for further reduction in the pressure of the first pressure chamber 311, and to ensure the smooth expansion and change of the gas in the second pressure chamber 312, the pressure applied by the pressure application component 200 to the cell 600 after the first pressure chamber 311 is filled with liquid is exactly at the minimum pressure value required by the cell 600, and correspondingly, the second pressure chamber 312 is filled with gas. Therefore, when the first pressure chamber 311 and the pressure application component 200 need to increase the pressure applied to the battery cell 600, the volume of the second pressure chamber 312 can be increased to squeeze the first pressure chamber 311, so that the pressure application component 200 can further apply pressure to the battery cell 600. When the pressure is too large and needs to be reduced, the volume of the second pressure chamber 312 can be reduced, so that the pressure application component 200 can reduce the pressure applied to the battery cell 600. When the volume of the second pressure chamber 312 is reduced to the pressure value of the pressure application component 200 reaches the preset minimum value, it will not be able to be reduced further, so as to control the pressure value of the pressure application component 200 from falling below the preset minimum value.

[0074] Therefore, the battery tray provided in this application embodiment includes a tray body 100 and a pressure applying component 200 and a voltage regulating component 300 disposed on the tray body 100. The voltage regulating component 300 has a first pressure chamber 311 and a second pressure chamber 312 with a fixed sum of volumes but variable relative volumes. The first pressure chamber 311 is connected to the cavity 230 of the pressure applying component 200, and the pressure applying component 200 can abut against the battery cell 600 contained in the tray body 100. The first pressure chamber 311 can be filled with liquid, and the second pressure chamber 312 can be filled with gas. By injecting or venting gas into the second pressure chamber 312, or by heating or cooling the gas in the second pressure chamber 312, the volume of the second pressure chamber 312 can be increased or decreased accordingly, and the volume of the first pressure chamber 311 relative to the volume of the second pressure chamber 312 can be decreased or increased accordingly.

[0075] When the volume of the second pressure chamber 312 increases, the volume of the first pressure chamber 311 decreases. Since the total amount of liquid in the first pressure chamber 311 and the cavity 230 remains constant, the liquid pressure in the first pressure chamber 311 and the cavity 230 increases, thereby increasing the pressure applied by the pressure applying component 200 to the cell 600. Conversely, when the volume of the second pressure chamber 312 decreases, the liquid pressure in the first pressure chamber 311 and the cavity 230 decreases, thereby decreasing the pressure applied by the pressure applying component 200 to the cell 600.

[0076] This application combines air pressure changes and hydraulic changes, achieving hydraulic changes through air pressure changes, while keeping the total volume of the second pressure chamber 312 and the first pressure chamber 311 constant. Therefore, there is no need to reserve space for the pressure regulating component 300, resulting in a smaller overall footprint. Furthermore, since gas is lighter than liquid, and the corresponding structures of the second pressure chamber 312 and the first pressure chamber 311 are lighter than rigid mechanical structures such as hydraulic cylinders, the pressure regulating component 300 can be made lighter overall. Moreover, since gas is more easily compressed and expanded than liquid, and the temperature change efficiency of gas is greater than that of liquid, pressure control in the pressure regulating component 300 is more convenient, and the corresponding temperature change amplitude during pressure changes is smaller.

[0077] Furthermore, compared to the existing technology where the piston 320 of the piston cylinder pushes the pressure application component 200 to apply rigid pressure to the cell 600 under hydraulic action, which is not easy to adapt to the expansion changes of the cell 600, the voltage regulating component 300 adjusts the pressure applied to the cell 600 in coordination with the second pressure chamber 312 and the first pressure chamber 311. When the cell 600 expands significantly, the pressure applied to the cell 600 by the pressure application component 200 interacts with the outward force of the cell 600's own expansion. This can, to a certain extent, force the gas in the second pressure chamber 312 to shrink through the liquid in the first pressure chamber 311. The second pressure chamber 312 buffers or even absorbs part of the pressure change of the cell 600, so that the liquid in the cavity 230 always applies a stable pressure to the cell 600, so that the pressure and expansion force on the cell 600 reach a dynamic balance, ensuring the safety of the battery and improving the voltage regulation effect of the cell 600.

[0078] Meanwhile, when isostatic pressure is applied to the cell 600 through the first pressure chamber 311 and the second pressure chamber 312, the cell 600 will not come into contact with the liquid in the first pressure chamber 311, making it easier to lead out the positive and negative terminals of the cell 600, and the sealing of the battery tray is also simplified accordingly.

[0079] In some embodiments, refer to Figures 1 to 3 As shown, the voltage regulating assembly 300 includes:

[0080] Box 310, box 310 is connected to pallet body 100;

[0081] Piston 320 is movably disposed within housing 310 and divides the internal space of housing 310 to form a first pressure chamber 311 and a second pressure chamber 312.

[0082] The piston 320 slides relative to the housing 310, so that the relative volumes of the first pressure chamber 311 and the second pressure chamber 312 change.

[0083] The piston 320 moves within the housing 310, specifically by sliding, causing a relative change in the volume of the first pressure chamber 311 and the second pressure chamber 312. Specifically, the expansion or contraction of the gas in the second pressure chamber 312 drives the piston 320 to slide within the housing 310, and further pressurizes the pressure application assembly 200 through the liquid in the first pressure chamber 311. This eliminates the need for mechanical components in the piston 320 control process, making the pressure regulating assembly 300 lighter, simpler in structure, and improving the overall reliability and stability of the pressure regulating assembly 300.

[0084] Furthermore, since gas volume is significantly affected by temperature changes, and temperature changes also affect the charging and discharging performance and expansion degree of cell 600, specifically, the higher the temperature, the easier it is for both the gas and cell 600 to expand. Therefore, when the battery is in a high-temperature environment, the expansion effect of cell 600 is more pronounced. At this time, the gas in the second pressure chamber 312 expands, resulting in a greater pressure applied to cell 600 by the pressure applying component 200, thus effectively suppressing the expansion of cell 600. Conversely, when the battery is in a low-temperature environment, the expansion effect of cell 600 weakens, the gas in the second pressure chamber 312 shrinks, and the pressure applied to cell 600 by the pressure applying component 200 also decreases, but the pressure applied to cell 600 is always maintained.

[0085] Among them, reference Figure 2 and Figure 4 As shown, piston 320 is slidably disposed within housing 310, and piston 320 includes:

[0086] Sliding block 321, sliding block 321 is in sliding engagement with housing 310;

[0087] A sealing ring 322 is fitted around the periphery of the sliding block 321 and seals the outer wall of the sliding block 321 and the inner wall of the housing 310.

[0088] The sliding block 321 slides within the housing 310, allowing it to move freely and smoothly. This enables the piston 320 to flexibly adjust the volumes of the first pressure chamber 311 and the second pressure chamber 312 according to the pressure requirements of the battery cell 600, thereby precisely regulating the pressure applied to the battery cell 600 by the pressure-applying component 200 and ensuring stable battery operation under different operating conditions. It should be noted that because the liquid in the first pressure chamber 311 is not easily compressed or expanded, although the sliding block 321 slides within the housing 310, its movement relative to the housing 310 is relatively small when adjusting the pressure of the battery cell 600.

[0089] The sealing ring 322 is sleeved around the sliding block 321, sealing the outer wall of the sliding block 321 and the inner wall of the housing 310. It can effectively prevent the liquid in the first pressure chamber 311 and the gas in the second pressure chamber 312 from leaking into each other, avoid damaging the pressure regulation mechanism of the voltage regulating component 300, and ensure the stability and reliability of the pressure on the battery cell 600.

[0090] The dimension of the sliding block 321 along its own sliding direction is greater than or equal to 30mm and less than or equal to 50mm.

[0091] It is understandable that this arrangement ensures that the size of the sliding block 321 along the sliding direction is sufficient to support the stability of the sliding, preventing the sliding block 321 from tipping over during the sliding process and causing the second pressure chamber 312 and the first pressure chamber 311 to communicate and leak. It also ensures that the sliding block 321 will not excessively occupy the internal space of the housing 310, and ensures that there is sufficient space for the first pressure chamber 311 and the second pressure chamber 312 inside the housing 310.

[0092] Furthermore, the voltage regulating component 300 also includes:

[0093] A pressure detection device is used to detect the internal pressure of the second pressure chamber 312.

[0094] A pressure regulating component is connected to the housing 310 and communicates with the second pressure chamber 312 to drive the volume of the second pressure chamber 312 to increase or decrease.

[0095] The controller is electrically connected to the air pressure detection device and the air pressure regulating device;

[0096] The controller is configured to, when the pressure inside the second pressure chamber 312 is determined by the pressure detector to be lower than the preset pressure, control the pressure regulator to drive the volume of the second pressure chamber 312 to increase accordingly, so that the pressure of the first pressure chamber 311 and the cavity 230 increases accordingly; and, when the pressure inside the second pressure chamber 312 is determined by the pressure detector to be higher than the preset pressure, control the pressure regulator to drive the volume of the second pressure chamber 312 to decrease accordingly, so that the pressure of the first pressure chamber 311 and the cavity 230 decreases accordingly.

[0097] The housing 310 has a through hole corresponding to the second pressure chamber 312, which communicates with a pressure regulating component. This pressure regulating component can be a compressor, used to control the increase or decrease, or expansion or contraction of gas within the second pressure chamber 312. The pressure detection component can specifically be a pressure sensor, installed on the inner wall of the second pressure chamber 312, capable of accurately detecting the internal pressure in real time and promptly feeding the pressure data back to the controller. The controller compares and analyzes the preset pressure value with the detected actual pressure, and can respond quickly when the internal pressure of the second pressure chamber 312 is lower or higher than the preset pressure.

[0098] Specifically, the preset pressure inside the second pressure chamber 312 can be a preset pressure range. When the pressure inside the second pressure chamber 312 exceeds the maximum value of the preset pressure range, the controller can reduce the gas volume of the second pressure chamber 312 through the gas pressure regulating component, or reduce the gas temperature to reduce the gas volume, so as to adjust the pressure inside the second pressure chamber 312 to the preset pressure range, thereby reducing the pressure applied by the pressure applying component 200 to the cell 600.

[0099] Based on the ideal gas law (ρV=nRT), when the pressure regulating component 300 is operating normally, the pressure inside the second pressure chamber 312 can be within or greater than the preset pressure range. However, when the pressure regulating component 300 experiences a leak or other malfunction, the pressure inside the second pressure chamber 312 will be less than the minimum value of the preset pressure range. In this case, the controller can increase the gas volume in the second pressure chamber 312 through the pressure regulating component or raise the gas temperature to cause the gas to expand, so as to keep the pressure inside the second pressure chamber 312 within the preset pressure range as much as possible, thereby increasing the pressure applied by the pressure applying component 200 to the battery cell 600. The controller can then be used to promptly troubleshoot the malfunction by personnel through the access hole.

[0100] In addition, refer to Figure 1 and Figure 5 As shown, to facilitate the filling of liquid into the first pressure chamber 311, a liquid inlet 313 is provided on one side of the housing 310 corresponding to the first pressure chamber 311, through which liquid can be filled. After filling, a sealing ring 3131 can be provided on the liquid inlet 313, and a pressure cap 3132 can be provided on the liquid inlet 313. The pressure cap 3132 is connected to the housing 310 by bolts, and the pressure cap 3132 presses on at least part of the sealing ring 3131 to ensure the sealing of the liquid inlet 313.

[0101] In specific implementation, refer to Figures 1 to 3 ,and Figure 6 As shown, the pressure application assembly 200 includes a first pressure application member 210. Multiple first pressure application members 210 are provided. The multiple first pressure application members 210 are sequentially and spaced apart from each other on the tray body 100, and the cavities 230 of each first pressure application member 210 are interconnected.

[0102] A receiving groove 211 is formed between two adjacent first pressure-applying members 210, and the receiving groove 211 is used to receive the battery cell 600.

[0103] Since the cavities 230 of each of the first pressure-applying components 210 are interconnected, the liquid pressure in the first pressure chamber 311 and the cavity 230 can be uniformly transmitted to each of the first pressure-applying components 210, so as to apply isostatic pressure to the battery cell 600 through the first pressure-applying components 210. When the volume of the second pressure chamber 312 changes, causing a change in the liquid pressure in the first pressure chamber 311 and the cavity 230, each of the first pressure-applying components 210 can synchronously apply the same amount of pressure to the battery cell 600, ensuring that multiple battery cells 600 are in the same pressure environment, so that each battery cell 600 is subjected to a balanced and consistent pressure, thereby improving the overall charging and discharging effect of the battery cell 600.

[0104] Furthermore, multiple first pressure-applying members 210 are arranged sequentially at intervals, and a receiving groove 211 is formed between two adjacent first pressure-applying members 210 to accommodate the battery cell 600, so that each battery cell 600 can be effectively constrained, so that the first pressure-applying member 210 can apply pressure in time to suppress the excessive expansion of the battery cell 600, stably control the degree of expansion of the battery cell 600, and extend the service life of the battery cell 600.

[0105] Furthermore, each of the first pressure-applying components 210 can also be regarded as a reinforcing rib structure provided on the tray body 100, which improves the overall rigidity of the battery to be manufactured later.

[0106] Among them, reference Figure 3 As shown, the tray body 100 has a communicating cavity 111, which connects the first pressure cavity 311 and the cavity 230 of each first pressure-applying member 210.

[0107] The use of a connecting cavity 111 within the tray body 100 to replace multiple complex connecting pipes 400 makes the layout of the battery module more compact, simplifies the internal structure of the battery tray, reduces the possibility of leakage due to too many connection points, and improves the reliability and sealing of the battery tray.

[0108] The connecting cavity 111 serves as a connection channel between the first pressure chamber 311 and the cavities 230 of each of the first pressure-applying components 210, allowing the liquid to flow freely within it. When a change in the volume of the second pressure chamber 312 causes a change in the pressure of the first pressure chamber 311, the liquid can quickly and evenly transmit the pressure to the cavities 230 of each of the first pressure-applying components 210 through the connecting cavity 111, avoiding uneven pressure distribution that could lead to poor charging and discharging performance or different degrees of expansion in some of the battery cells 600.

[0109] Among them, reference Figure 3 As shown, the pallet body 100 includes a bottom plate 110, a communicating cavity 111 located within the bottom plate 110, and the rigidity of the bottom plate 110 is greater than the rigidity of the first pressure member 210.

[0110] The connecting cavity 111 is located on the base plate 110, and the relatively rigid base plate 110 provides stable support for the connecting cavity 111. When the liquid pressure changes in the first pressure chamber 311 and the cavity 230, the base plate 110 can withstand greater pressure without easily deforming, and guides the deformation to the relatively less rigid first pressure-applying member 210, so that the first pressure-applying member 210 pushes the battery cell 600 under pressure, ensuring the pressure application effect on the battery cell 600 and improving the efficiency and effectiveness of pressure transmission. Furthermore, this can prevent the connecting cavity 111 from rupturing or leaking liquid due to deformation of the base plate 110, thereby ensuring that the pressure can be stably and effectively transmitted through the connecting cavity 111 to the cavities 230 of each first pressure-applying member 210, achieving precise adjustment of the pressure of the battery cell 600.

[0111] In specific implementation, the first pressure-applying component 210 can be made of ternary aluminum. No reinforcing ribs are provided in the cavity 230 of the first pressure-applying component 210 to facilitate expansion and pressure application. The base plate 110 can be made of ternary aluminum porous extrusion profile, thereby forming reinforcing ribs in the connecting cavity 111 of the base plate 110 to improve the rigidity of the base plate 110. The first pressure-applying component 210 and the tray body 100 can be manufactured as a whole through extrusion profile, friction welding, and integral brazing processes.

[0112] Furthermore, in some embodiments, reference is made to Figures 1 to 3 ,and Figure 7 As shown, the battery tray also includes a connecting pipe 400. Multiple connecting pipes 400 are provided, and the multiple connecting pipes 400 respectively connect to the cavities 230 of two adjacent first pressure-applying members 210.

[0113] By setting up a connecting pipe 400, the connecting pipe 400 is further connected to the adjacent first pressure-applying component 210 on the basis of the connecting cavity 111, which shortens the pressure transmission path between the adjacent first pressure-applying components 210 and reduces the time delay of pressure transmission.

[0114] In practice, the connecting pipe 400 is a flexible pipe.

[0115] By setting the connecting pipe 400 as a flexible pipe, when the pressure in the first pressure chamber 311 increases, the flexible pipe can absorb part of the expansion of the first pressure-applying component 210, thus preventing the root position of the first pressure-applying component 210 connected to the connecting chamber 111 from being subjected to excessive pressure and rupture.

[0116] The connecting pipe 400 can be a rubber hose with sufficient structural strength, or a metal corrugated pipe that can be bent or expanded; this application makes no limitation on this.

[0117] Furthermore, refer to Figure 2 and Figure 6 As shown, the pallet body 100 also includes an upper cover 130 and a side plate 120. The side plate 120 is disposed on the bottom plate 110, and the upper cover 130 is disposed on the side of the first pressure member 210 away from the bottom plate 110, and connects the side plate 120 and each of the first pressure members 210.

[0118] The side plate 120 is mounted on the base plate 110, and the top cover 130 is mounted on the side of the first pressure member 210 away from the base plate 110 and connects the side plate 120 and each of the first pressure members 210. The three together form a relatively stable frame structure, which improves the overall mode of the battery so as to effectively resist external impacts and vibrations and protect the internal cells 600 and other components.

[0119] To further improve the reliability of the connection between the upper cover 130 and the first pressure member 210, a protruding ridge is provided on the first pressure member 210, and a groove corresponding to the protruding ridge is provided on the upper cover 130. The groove and the protruding ridge are interlocked and welded together, or bonded by structural adhesive. This application does not limit this.

[0120] In addition, refer to Figure 8 and Figure 9 As shown, the battery tray also has a second embodiment structure, wherein the pressure application component 200 includes a second pressure application member 220, and at least one pressure regulating component 300 is provided, with the second pressure application member 220 and the pressure regulating component 300 being provided in a one-to-one correspondence;

[0121] The second pressure-applying component 220 is slidably connected to the tray body 100 and is used to apply pressure to the outermost cell 600 among the cells 600.

[0122] Since the second pressure-applying member 220 can slide relative to the tray body 100, it only needs to apply pressure to the outermost cell 600 among the cells 600. Through the interaction between adjacent cells 600, the isostatic pressure state of each cell 600 is maintained. Specifically, a telescopic box 221 can be provided on the side of the second pressure-applying member 220 away from the cell 600. A cavity 230 is formed inside the telescopic box 221 to communicate with the first pressure chamber 311 of the voltage regulating assembly 300. The telescopic box 221 expands and contracts by changes in liquid pressure to drive the second pressure-applying member 220 to move. It is understood that in the battery tray structure of this embodiment, the stroke of the piston 320 in the voltage regulating assembly 300 can be greater than the stroke of the piston 320 in the aforementioned battery tray structure.

[0123] Furthermore, refer to Figure 8 As shown, two second pressure-applying components 220 are provided, and the two second pressure-applying components 220 are respectively located on opposite sides of the tray body 100 along the stacking direction of the battery cells 600.

[0124] Two second pressure-applying components 220 apply pressure to the battery cell 600 from opposite sides, ensuring that each battery cell 600 is subjected to uniform and symmetrical pressure in the horizontal direction. This helps to avoid problems such as local deformation and internal structural damage caused by uneven force on one side of the battery cell 600, ensuring that all parts of the battery cell 600 can work under a stable pressure environment, thereby improving the overall charging and discharging performance of the battery cell 600.

[0125] The volume of the cavity 230 of the second pressure-applying member 220 is variable along the sliding direction of the second pressure-applying member 220.

[0126] Specifically, a telescopic box 221 can be provided on the side of the second pressure-applying member 220 away from the battery cell 600. A cavity 230 is formed inside the telescopic box 221 to communicate with the first pressure chamber 311 of the voltage regulating assembly 300. The telescopic box 221 expands and contracts by changes in liquid pressure to drive the second pressure-applying member 220 to move. It is understood that, under the battery tray structure of this embodiment, the travel distance of the piston 320 in the voltage regulating assembly 300 can be greater than the travel distance of the piston 320 in the aforementioned battery tray structure.

[0127] In some embodiments, refer to Figure 8 and Figure 9 As shown, the pallet body 100 includes a bottom plate 110 and a side plate 120. The side plate 120 is disposed on the bottom plate 110. At least one of the bottom plate 110 and the side plate 120 is provided with a guide portion 121. The second pressure member 220 is provided with a sliding portion 222, and the sliding portion 222 is slidably connected to the guide portion 121.

[0128] One of the guide portion 121 and the sliding portion 222 is a groove, and the other is a matching slide rail. The cooperation between the guide portion 121 and the sliding portion 222 includes the sliding of the second pressure member 220, which provides precise guidance. This allows the second pressure member 220 to move along a preset direction when applying pressure to the outermost cell 600, ensuring that the pressure is accurately applied to the cell 600. This avoids uneven force on the cell 600 due to deviation in the pressure direction, thereby improving the charging and discharging performance and service life of the cell 600.

[0129] Furthermore, the battery tray also includes multiple pads 500, which are respectively used to be placed between two adjacent battery cells 600 and to abut against the battery cells 600.

[0130] By setting the pad 500, stable pressure transmission between adjacent cells 600 can be ensured, and direct contact and mutual squeezing between cells 600 can be avoided. In order to ensure uniform pressure transmission between cells 600, the flatness of the pad 500 can be set to be relatively high, specifically, the flatness of the pad 500 can be set to within 0.5.

[0131] Furthermore, in some embodiments, reference is made to Figure 2 , Figure 6 and Figure 8 As shown, the area of ​​the surface on the pressure-applying assembly 200 used to apply pressure to the battery cell 600 is larger than the area of ​​the surface of the battery cell 600 under pressure.

[0132] For the first pressure-applying component 210 and the second pressure-applying component 220, when the surface area of ​​the pressure-applying component 200 is larger than the surface of the battery cell 600, it can completely cover the battery cell 600, which can distribute the pressure more widely to the surface of the battery cell 600, avoid local high pressure, make the battery cell 600 more uniformly stressed, reduce internal damage caused by uneven pressure, and improve the safety and reliability of the battery cell 600.

[0133] Furthermore, the pressure surface area of ​​the first pressure-applying component 210 can be specifically equal to the sum of the pressure-bearing surface area and the adhesive-coated area of ​​the battery cell 600, ensuring the stable installation of the battery cell 600 in the battery tray.

[0134] This application also provides a battery pack, including a battery module and the aforementioned battery tray, wherein the battery module is disposed within the battery tray.

[0135] Furthermore, embodiments of this application also provide an electrical device, including a device body and the aforementioned battery tray disposed on the device body; or, including a device body and the aforementioned battery pack disposed on the device body.

[0136] The battery tray has been described in detail in the above embodiments and will not be repeated here.

[0137] The battery and electrical device provided in this application embodiment, by setting a battery tray, includes a tray body 100 and a pressure applying component 200 and a voltage regulating component 300 disposed on the tray body 100. The voltage regulating component 300 has a first pressure chamber 311 and a second pressure chamber 312 with a fixed sum of volumes but variable relative volumes. The first pressure chamber 311 is connected to the cavity 230 of the pressure applying component 200, and the pressure applying component 200 can abut against the battery cell 600 contained in the tray body 100. The first pressure chamber 311 can be filled with liquid, and the second pressure chamber 312 can be filled with gas. By injecting or discharging gas into the second pressure chamber 312, or by heating or cooling the gas in the second pressure chamber 312, the volume of the second pressure chamber 312 can be increased or decreased accordingly, and the volume of the first pressure chamber 311 relative to the volume of the second pressure chamber 312 can be decreased or increased accordingly.

[0138] When the volume of the second pressure chamber 312 increases, the volume of the first pressure chamber 311 decreases. Since the total amount of liquid in the first pressure chamber 311 and the cavity 230 remains constant, the liquid pressure in the first pressure chamber 311 and the cavity 230 increases, thereby increasing the pressure applied by the pressure applying component 200 to the cell 600. Conversely, when the volume of the second pressure chamber 312 decreases, the liquid pressure in the first pressure chamber 311 and the cavity 230 decreases, thereby decreasing the pressure applied by the pressure applying component 200 to the cell 600.

[0139] Compared to the existing technology where the piston 320 of the piston cylinder pushes the pressure application component 200 to apply rigid pressure to the cell 600 under hydraulic action, which is not easy to adapt to the expansion changes of the cell 600, the voltage regulating component 300 adjusts the pressure applied to the cell 600 through the coordinated regulation of the second pressure chamber 312 and the first pressure chamber 311. When the cell 600 expands significantly, the pressure applied to the cell 600 by the pressure application component 200 interacts with the outward force of the cell 600's own expansion. This can, to a certain extent, force the gas in the second pressure chamber 312 to shrink through the liquid in the first pressure chamber 311. The second pressure chamber 312 buffers or even absorbs part of the pressure change of the cell 600, so that the liquid in the cavity 230 always applies a stable pressure to the cell 600, so that the pressure and expansion force on the cell 600 reach a dynamic balance, ensuring the safety of the battery and improving the voltage regulation effect of the cell 600.

[0140] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments" used in the specification indicate that an embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0141] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "one" can be understood to convey either singular or plural usage.

[0142] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0143] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery tray, characterized by, The application relates to a battery cell pressure applying and adjusting device. The device comprises: a tray body (100) for accommodating a battery cell (600); a pressure applying assembly (200) arranged in the tray body (100), the pressure applying assembly (200) having a cavity (230); a pressure adjusting assembly (300) having a first pressure chamber (311) and a second pressure chamber (312) with variable volumes, the sum of the volumes of the first pressure chamber (311) and the second pressure chamber (312) being constant, the first pressure chamber (311) being filled with a first medium, the second pressure chamber (312) being filled with a second medium, the first medium having a lower swelling property than the second medium; 2. The battery tray of claim 1, wherein, the first pressure chamber (311) being in communication with the cavity (230) so that the first medium in the first pressure chamber (311) applies pressure to the battery cell (600) through the cavity (230). The pressure adjusting assembly (300) comprises: a box body (310) connected to the tray body (100); a piston (320) movably arranged in the box body (310) and separating the internal space of the box body (310) to form the first pressure chamber (311) and the second pressure chamber (312); 3. The battery tray of claim 2, wherein, the piston (320) sliding relative to the box body (310) to change the volumes of the first pressure chamber (311) and the second pressure chamber (312) relatively. The piston (320) is slidingly arranged in the box body (310), and the piston (320) comprises: a sliding block (321) slidingly matched with the box body (310); 4. The battery tray of claim 3, wherein, a sealing ring (322) sleeved on the circumferential side of the sliding block (321) and sealingly connecting the outer side wall of the sliding block (321) and the inner side wall of the box body (310).

5. The battery tray of claim 2, wherein, The dimension of the sliding block (321) along the sliding direction of the sliding block (321) is greater than or equal to 30 mm and less than or equal to 50 mm. The pressure adjusting assembly (300) further comprises: a gas pressure detecting member for detecting the internal pressure of the second pressure chamber (312); a gas pressure adjusting member connected with the box body (310) and in communication with the second pressure chamber (312) to drive the volume of the second pressure chamber (312) to increase or decrease; a controller electrically connected with the gas pressure detecting member and the gas pressure adjusting member. The controller is configured to control the air pressure adjusting member to drive the second pressure cavity (312) to correspondingly increase in volume when the air pressure detecting member determines that the pressure inside the second pressure cavity (312) is lower than the preset pressure, so as to correspondingly increase the pressure of the first pressure cavity (311) and the cavity (230); and control the air pressure adjusting member to drive the second pressure cavity (312) to correspondingly decrease in volume when the air pressure detecting member determines that the pressure inside the second pressure cavity (312) is higher than the preset pressure, so as to correspondingly decrease the pressure of the first pressure cavity (311) and the cavity (230).

6. The battery tray of any one of claims 1-5, wherein, The pressure applying assembly (200) comprises a plurality of first pressure applying members (210), and the plurality of first pressure applying members (210) are sequentially and spacedly connected to the tray body (100), and the cavities (230) of the first pressure applying members (210) are communicated with each other. An accommodating groove (211) is formed between two adjacent first pressure applying members (210), and the accommodating groove (211) is used for accommodating the battery cell (600).

7. The battery tray of claim 6, wherein, The tray body (100) has a communication cavity (111) therein, and the communication cavity (111) communicates the first pressure cavity (311) and the cavity (230) of each first pressure applying member (210).

8. The battery tray of claim 7, wherein, The tray body (100) comprises a bottom plate (110), the communication cavity (111) is located in the bottom plate (110), and the rigidity of the bottom plate (110) is greater than the rigidity of the first pressure applying member (210).

9. The battery tray of claim 7, wherein, The tray body (100) further comprises a plurality of connecting pipes (400), and each connecting pipe (400) corresponds to the cavities (230) of two adjacent first pressure applying members (210).

10. The battery tray of claim 9, wherein, The connecting pipe (400) is a flexible pipe.

11. The battery tray of claim 8, wherein, The tray body (100) further comprises an upper cover (130) and a side plate (120), the side plate (120) is arranged on the bottom plate (110), the upper cover (130) is arranged on the side of the first pressure applying member (210) away from the bottom plate (110), and the upper cover (130) connects the side plate (120) and the first pressure applying member (210).

12. The battery tray of any one of claims 1-5, wherein, The pressure applying assembly (200) comprises a second pressure applying member (220), and the pressure regulating assembly (300) comprises at least one, and the second pressure applying member (220) is arranged in one-to-one correspondence with the pressure regulating assembly (300). The second pressure applying member (220) is slidably connected to the tray body (100) and is used for applying pressure to the outermost battery cell (600) in each battery cell (600).

13. The battery tray of claim 12, wherein, The second pressure applying member (220) comprises two, and the two second pressure applying members (220) are respectively located on opposite sides of the tray body (100) along the stacking direction of the battery cell (600).

14. The battery tray of claim 12, wherein, The volume of the cavity (230) of the second pressure applying member (220) is variable along the sliding direction of the second pressure applying member (220).

15. The battery tray of claim 12, wherein, The tray body (100) comprises a bottom plate (110) and a side plate (120) arranged on the bottom plate (110), a guide portion (121) is arranged on at least one of the bottom plate (110) and the side plate (120), a sliding portion (222) is arranged on the second pressure applying member (220), and the sliding portion (222) is in sliding connection with the guide portion (121).

16. The battery tray of claim 15, wherein, The device further comprises a plurality of spacers (500), each of the plurality of spacers (500) being arranged between two adjacent battery cells (600) and abutting against the battery cells (600).

17. The battery tray of any one of claims 1-5, wherein, An area of a surface of the pressure applying assembly (200) for applying pressure to the battery cells (600) is greater than an area of a surface of the battery cells (600) subjected to pressure.

18. A battery pack, characterized by The device comprises a battery module and a battery tray according to any one of claims 1-17, the battery module being arranged in the battery tray.

19. An electrical device, comprising: The device comprises a device body and a battery tray according to any one of claims 1-17 arranged on the device body, or the device comprises a device body and a battery pack according to claim 18 arranged on the device body.

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