Tray, battery pack, and electric device

Abstract

The application provides a tray, a battery pack and an electric device. The tray comprises a first fixed plate and a restraint device; the restraint device comprises an elastic component and a movable plate; one end of the elastic component is arranged on the first fixed plate, the other end of the elastic component is connected with the movable plate, and the elastic component is used at least for applying a pushing force to the movable plate towards the battery pack. The application can solve the problem of uneven force of the tray on the battery, the tray can adjust the applied pushing force according to the state of the battery, and proper restraint force can be ensured for the battery in the whole use cycle.

Description

Technical Field

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

[0002] Battery packs are an important component of electric vehicles and other electrical devices, providing energy to other electrical components within these devices. A battery pack includes a tray and batteries housed within the tray, which provides support and protection for the batteries.

[0003] However, the batteries located in the tray will shrink or expand during charging and discharging, resulting in uneven force exerted by the tray on the batteries, which can easily lead to performance degradation. Utility Model Content

[0004] This application provides a tray, a battery pack, and an electrical device to solve the problem of uneven force exerted by the tray on the battery.

[0005] In a first aspect, embodiments of this application provide a tray, including a first fixing plate and a restraint device; the first fixing plate

[0006] The restraint device includes an elastic component and a movable plate;

[0007] One end of the elastic component is disposed on the first fixed plate, and the other end of the elastic component is connected to the movable plate. The elastic component is at least used to apply a pushing force toward the battery pack to the movable plate.

[0008] In some embodiments of this application,

[0009] The elastic component includes at least one first elastic element;

[0010] The first elastic element includes a support element and a first spring;

[0011] The support member is disposed in one of the first fixed plate and the movable plate; the first spring is disposed in the other of the first fixed plate and the movable plate, and the first spring is connected to the support member.

[0012] In some embodiments of this application, the support member is provided with a guide groove;

[0013] The first elastic element further includes a pushing part, one end of which is connected to the movable plate, and the other end of which passes through the guide groove and slides in contact with the support member. The support member is disposed on the first fixed plate, and the first spring is sleeved on the outer periphery of the pushing part. In some embodiments of this application, the first elastic element further includes a second spring;

[0014] The second spring is disposed in the guide groove, and the second spring and the pushing part are connected or spaced apart.

[0015] In some embodiments of this application, the first elastic element is configured as follows:

[0016] When the movable plate is in the first position, the first spring abuts against the support member, and the second spring does not contact the pushing part;

[0017] When the movable plate is in the second position, the second position is closer to the first fixed plate than the first position; the first spring abuts against the support member, and the second spring abuts against the pushing part. In some embodiments of this application, the plurality of elastic members include at least one second elastic member, the first end of the second elastic member is connected to the first fixed plate, and the second end of the second elastic member is connected to the movable plate.

[0018] In some embodiments of this application, the number of the first elastic elements is multiple, and the multiple first elastic elements are spaced apart.

[0019] In some embodiments of this application, the elastic element includes at least one of the first elastic elements. The first elastic element includes a second spring and a pushing portion;

[0020] The second spring and the pushing part are arranged opposite to each other;

[0021] One of the second spring and the pushing part forms the first end of the elastic element and is connected to the first fixed plate; the other of the second spring and the pushing part forms the second end of the elastic element and is connected to the movable plate.

[0022] In some embodiments of this application, the elastic component includes at least one second elastic member connected to the first fixed plate, and one end of the second elastic member away from the first fixed plate is connected to the movable plate.

[0023] The number of the second elastic elements is multiple, and the multiple second elastic elements are arranged around the outside of the first elastic element.

[0024] In some embodiments of this application, the second elastic element is configured as a foldable elastic metal sheet.

[0025] In some embodiments of this application, the elastic component further includes a fixing element and a moving element;

[0026] The fixing member is disposed on the first fixing plate, and the moving member is disposed on the movable plate;

[0027] The support member is disposed on the surface of the fixing member away from the first fixing plate, and the first spring is disposed on the surface of the moving member away from the movable plate;

[0028] One end of the second elastic member is connected to the fixed member, and the other end of the second elastic member is connected to the movable member.

[0029] In some embodiments of this application, a second fixing plate is also included, which is disposed opposite to the first fixing plate;

[0030] The space between the second fixed plate and the movable plate can be used to accommodate the battery pack.

[0031] In some embodiments of this application, a side beam is also included, which is connected to the first fixed plate, and the extension direction of the side beam is parallel to the extension and contraction direction of the elastic component;

[0032] The movable plate is provided with at least one roller, and the side beam is provided with at least one contact part. The roller is correspondingly arranged with the contact part and makes rolling contact.

[0033] In some embodiments of this application, the movable plate is provided with a plurality of the rollers;

[0034] The side beam is provided with a plurality of contact portions, which are arranged at intervals along the height direction of the side beam.

[0035] Secondly, embodiments of this application provide a battery pack, including a battery assembly and a tray as described above.

[0036] The battery pack is located on the side of the movable plate away from the elastic component, and the elastic component is at least used to apply a pushing force to the movable plate toward the battery pack.

[0037] In some embodiments of this application, a second fixing plate is also included, which is disposed opposite to the first fixing plate;

[0038] The battery pack is disposed between the second fixed plate and the movable plate, with the second fixed plate abutting against the first end of the battery pack and the movable plate abutting against the second end of the battery pack.

[0039] Thirdly, embodiments of this application provide an electrical device, including the battery pack described above, the battery pack being used to provide electrical energy to the electrical device.

[0040] The tray, battery pack, and electrical equipment provided in this application embodiment, through the use of elastic components, allow the tray to adjust the applied pressure according to the battery's state, ensuring that the battery receives appropriate restraint force throughout its entire service life; the design of the movable plate and elastic components ensures uniform pressure distribution, reducing battery performance degradation caused by uneven pressure; by providing stable restraint pressure, the tray can effectively reduce battery structural deformation, improving battery safety and cycle performance. 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 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0043] Figure 2 for Figure 1 Cross-sectional view of the battery pack;

[0044] Figure 3 for Figure 2 Schematic diagram of the connection structure between the intermediate elastic component and the first fixed plate;

[0045] Figure 4 for Figure 3 Schematic diagram of the structure of the first elastic element;

[0046] Figure 5 for Figure 2 Enlarged view of section A.

[0047] Explanation of reference numerals in the attached figures:

[0048] 110. Second fixing plate; 120. First fixing plate;

[0049] 200. Restraint device;

[0050] 210. Elastic component; 211. Fixing component; 212. Moving component;

[0051] 2131, Second elastic element; 2132, First elastic element; 21321b, First spring; 21322, Pushing part; 21323, Supporting element; 21323a, Second spring; Guide groove; 21324;

[0052] 220. Movable board;

[0053] 300, edge beam;

[0054] 400. Battery pack.

[0055] 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

[0056] As described in the background section, current liquid lithium-ion batteries are nearing their energy density limits, and their liquid electrolytes pose flammable and explosive risks, resulting in lower battery safety performance. In contrast, lithium-ion batteries offer higher safety and energy density. Furthermore, they possess advantages in power characteristics and temperature adaptability, potentially significantly improving the driving range and charging performance of electric vehicles.

[0057] During charging and discharging, the positive electrode of a battery contracts while the negative electrode expands. Furthermore, long-term use can lead to continuous expansion and internal pressure due to side reactions, affecting battery structure, initial efficiency, and cycle performance. Therefore, batteries need to operate under certain constraint pressures to eliminate the negative effects of expansion. Optimal pressure conditions are required to suit the battery's desired performance (capacity per unit area). Specifically, battery thickness varies depending on the state of charge (SOC), thus requiring pressure conditions appropriate to the SOC.

[0058] Existing battery restraint devices commonly use pressure clamps. These clamps consist of two stacked clamps inserted between two surfaces of the battery cell stack, and a fastening mechanism for securing and fixing the two clamps to each other. However, this pressure application method is prone to uneven pressure application, and it is a static system that can only maintain a fixed initial pressure. Over long-term operation, the battery expands and contracts, reducing the total pressure in traditional pressure structures and negatively impacting battery structure, initial efficiency, and cycle performance.

[0059] In view of this, the tray provided in this application embodiment, through the use of elastic components, can automatically adjust the applied pressure according to the state of the battery, ensuring that the battery receives appropriate restraint force throughout the entire service life; the design of the movable plate and elastic components ensures uniform pressure distribution, reducing battery performance degradation caused by uneven pressure; by providing stable restraint pressure, the tray can effectively reduce battery structural deformation, which not only improves battery safety but also improves initial efficiency and cycle performance.

[0060] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0061] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0062] Combination Figures 1-5 As shown, this application embodiment provides a tray, including a first fixing plate 120 and a restraint device 200;

[0063] The restraint device 200 includes an elastic component 210 and a movable plate 220.

[0064] One end of the elastic component 210 is disposed on the first fixed plate 120, and the other end of the elastic component 210 is connected to the movable plate 220. The elastic component 210 is at least used to apply a pushing force toward the battery pack 400 to the movable plate 220.

[0065] It is understood that the first fixed plate elastic component 210 provides a continuous and dynamic force, enabling the movable plate 220 to apply the necessary pushing force to the battery pack. During the charging and discharging process of the battery pack, the thickness of the battery will change according to the state of charge (SOC). The elastic component 210 can automatically adjust the applied pressure according to the change in the thickness of the battery pack, ensuring that the pressure applied to the battery is always in a dynamic constant pressure state. This dynamic adjustment capability enables the tray to continuously provide uniform pressure when the battery pack expands and contracts, avoiding the problem of pressure reduction and uneven pressure in traditional pressure clamps during long-term use.

[0066] State of Charge (SOC) is an important indicator for measuring the current remaining capacity of a battery. It is usually expressed as a percentage and reflects the ratio of the battery's current capacity to its maximum capacity.

[0067] With the use of the elastic component 210, the tray can automatically adjust the applied pressure according to the state of the battery pack 400, ensuring that the battery receives appropriate pushing restraint force throughout the entire service life; the design of the movable plate 220 and the elastic component 210 ensures uniform pressure distribution, reducing battery performance degradation caused by uneven pressure; by providing stable restraint pressure, the tray can effectively reduce battery pack structural deformation, which not only improves battery safety but also improves initial efficiency and cycle performance.

[0068] First-cycle efficiency (CEE) typically refers to the battery's efficiency during its first charge-discharge cycle, specifically the ratio of the first discharge capacity to the first charge capacity. It reflects the battery's energy utilization efficiency during initial use. CEE is usually expressed as a percentage, and the calculation formula is as follows:

[0069]

[0070] Cyclic performance refers to a battery's ability to maintain its capacity and performance after multiple charge-discharge cycles. It is usually measured by cycle life, which is the number of charge-discharge cycles a battery can undergo before its capacity drops to a certain percentage (e.g., 80%).

[0071] In some possible implementations, the elastic component 210 includes at least one first elastic element 2132.

[0072] The first elastic element 2132 includes a support element 21323 and a first spring 21321b;

[0073] The support member 21323 is disposed in one of the first fixed plate 120 and the movable plate 220; the first spring 21321b is disposed in the other of the first fixed plate 120 and the movable plate 220, and the first spring 21321b is connected to the support member 21323.

[0074] It is known that the support member 21323 is disposed on one of the first fixed plate 120 and the movable plate 220, and can serve as the support base for the first spring 21321b; the first spring 21321b can provide elastic force so as to automatically adjust the applied pressure when the battery pack 400 expands or contracts.

[0075] When the battery pack 400 expands or contracts due to charging, discharging or long-term use, the first spring 21321b will compress or stretch according to the state of the battery pack. The support member 21323 provides a fixed support point, so that the first spring 21321b can effectively apply or release pressure.

[0076] Due to the elastic properties of the first spring 21321b, the tray can automatically adjust the applied pressure according to the expansion or contraction of the battery pack 400.

[0077] In some possible implementations, a guide groove 21324 is provided in the support member 21323.

[0078] The first elastic member 2132 also includes a pushing part 21322. One end of the pushing part 21322 is connected to the movable plate 220, and the other end of the pushing part 21322 passes through the guide groove 21324 and slides in contact with the support member 21323. The support member 21323 is disposed on the first fixed plate 120, and the first spring 21321b is sleeved on the outer periphery of the pushing part 21322.

[0079] It is known that the guide groove 21324 is used to guide the movement of the push part 21322, ensuring that the movement path of the push part 21322 is controlled and stable when pressure is applied. The push part 21322 slides freely in the guide groove 21324, thereby effectively transmitting the elastic force of the spring to the movable plate 220.

[0080] The design of the guide groove 21324 restricts the movement path of the pusher 21322 to a fixed direction, ensuring that the elastic force can be stably transmitted to the movable plate 220, thereby ensuring the application of uniform pressure. The sliding contact design between the pusher 21322 and the support 21323 reduces friction and wear, extends the service life of the device, and also ensures the efficiency of pressure transmission.

[0081] In some possible implementations, the first elastic element 2132 may also include a second spring 21321a.

[0082] The second spring 21321a is provided in the guide groove 21324, and the second spring 21321a and the pushing part 21322 are connected or spaced apart.

[0083] It is known that the second spring 21321a, as an elastic element, provides the necessary elastic force to regulate pressure; the arrangement of the pusher 21322 and the second spring 21321a can transmit and distribute the force generated by the second spring 21321a. This relative arrangement design allows the second spring 21321a and the pusher 21322 to interact when the thickness of the battery pack changes, providing dynamic pressure regulation. When the battery pack expands, it compresses the second spring 21321a. This process increases the pressure applied to the battery pack to restrain the internal pressure caused by the expansion.

[0084] The combination of the second spring 21321a and the pusher 21322 enables uniform pressure to be applied across the entire surface of the battery pack 400, reducing localized stress concentration. This design allows the system to automatically adjust the applied pressure during the charging and discharging process of the battery pack 400 to accommodate changes in the thickness of the battery pack 400, avoiding the shortcomings of traditional static pressurization systems. By maintaining appropriate restraint pressure, the accumulation of internal pressure in the battery pack is reduced, minimizing damage to the battery pack structure and thus extending the service life of the battery pack 400.

[0085] In some possible implementations, the first elastic member 2132 further includes a support member 21323, which is sleeved on the outside of the second spring 21321a;

[0086] At least a portion of the actuating part 21322 is located within the support member 21323, and the actuating part 21322 can approach or move away from the second spring 21321a within the support member 21323.

[0087] It is known that the support member 21323 is sleeved on the outside of the second spring 21321a, providing a stable guide path; the pusher 21322 can move within the support member 21323 in a direction close to or away from the second spring 21321a, so the support member 21323 can keep the pusher 21322 on the required trajectory during movement and prevent lateral deviation.

[0088] The support member 21323 provides a stable guide path, reducing the swaying and offset of the pusher during movement and ensuring uniform pressure distribution. By limiting the range of motion of the pusher 21322, the support member 21323 reduces the risk of component wear and failure, and improves the overall reliability of the system. The use of the support member 21323 enables the pusher 21322 to respond more accurately to changes in battery pack thickness and provide pressure conditions suitable for different charging states.

[0089] In some possible embodiments, there are multiple first elastic elements 2132, and the multiple first elastic elements 2132 are arranged at intervals.

[0090] It is known that each elastic element 2132 can independently adjust the applied pressure according to the expansion or contraction of the battery pack 400, and the multi-point pressure design ensures that uniform restraint pressure is applied to the entire surface of the battery 400.

[0091] Uniform pressure distribution reduces the performance degradation of the battery pack 400 caused by excessive or insufficient local pressure.

[0092] In some possible implementations, the elastic component 210 includes at least one second elastic element 2131.

[0093] The second elastic element 2131 is connected to the first fixed plate 120, and one end of the second elastic element 2131 away from the first fixed plate 120 is connected to the movable plate 220. The second elastic element 2131 is used to provide additional elastic force during the expansion or contraction of the battery pack; one end of it is connected to the first fixed plate 120 to ensure its fixation and stability in the device; the other end is connected to the movable plate 220, so that pressure can be applied or released when the state of the battery pack 400 changes.

[0094] In some possible embodiments, there are multiple second elastic members 2131, which surround the outer side of the first elastic member 2132. It is understood that the multiple first elastic members 2132 are used to provide pressure support in the central region. During the charging and discharging process of the battery pack 400, the thickness variation of the battery may exhibit different characteristics in different regions. The second elastic members 2131 are responsible for providing additional uniform pressure along the circumference, while the first elastic members 2132 focus on pressure regulation in the inner region. The arrangement of the first elastic members 2132 can effectively compensate for the pressure unevenness caused by the expansion or contraction of the central region of the battery.

[0095] By adding a second elastic member 2131 outside the first elastic member 2132, the tray can apply appropriate pressure to the center and peripheral areas of the battery pack 400 simultaneously, further improving the uniformity of pressure and reducing the degradation of battery performance caused by local pressure unevenness; the addition of the second elastic member 2131 enables the tray to better adapt to the deformation of the battery pack in different areas, providing more precise pressure regulation.

[0096] In some possible implementations, the second elastic element 2131 is configured as a folding elastic metal sheet.

[0097] The second elastic element 2131 employs a folded elastic metal sheet. This design allows the sheet to expand or contract under stress, providing dynamic pressure regulation capabilities. Specifically, the folded elastic metal sheet expands when the battery pack expands, providing greater pressure to resist the expansion trend; when the battery pack contracts, the sheet contracts, reducing the applied pressure. This dynamic pressure regulation capability of the second elastic element 2131 enables the tray to maintain appropriate restraint pressure throughout the entire battery pack's lifespan, adapting to changes in battery thickness.

[0098] In some possible implementations, the elastic component 210 may also include a fixing member 211 and a moving member 212.

[0099] The fixing component 211 is disposed on the first fixing plate 120, and the moving component 212 is disposed on the movable plate 220.

[0100] One end of the second elastic member 2131 is connected to the fixed member 211, and the other end of the second elastic member 2131 is connected to the movable member 212.

[0101] It is known that the fixing member 211 is set on the first fixing plate 120, serving as the stable foundation of the entire system; the moving member 212 is set on the movable plate 220, and can move with the expansion or contraction of the battery pack 400; the support member 21323 provides a stable support point; and the first spring 21321b can apply or release pressure when the state of the battery pack 400 changes.

[0102] The fastener 211 provides a stable foundation, ensuring that the entire system does not move or deform unnecessarily when pressure is applied; the movable element 212 is able to automatically adjust the applied pressure when the battery pack 400 expands or contracts, ensuring that the battery pack 400 receives appropriate restraint force throughout its service life.

[0103] In some possible implementations, the second elastic member 2131 and the first elastic member 2132 are configured as follows:

[0104] When the movable member 212 is in the first position, the second elastic member 2131 applies a force to the movable member 212, while the first elastic member 2132 does not apply a force to the movable member 212.

[0105] When the movable member 212 is in the second position, the movable member 212 is closer to the fixed member 211 than the first position. The second elastic member 2131 applies a force to the movable member 212, and the first elastic member 2132 applies a force to the movable member 212.

[0106] It can be understood that when the moving member 212 is in the first position (which can refer to the initial state of the battery pack before the first charge and discharge), it is responsible for applying force to the moving member 212. When the moving member 212 is in the second position, the first elastic member 2132 begins to apply force to the moving member 212, working together with the second elastic member 2131.

[0107] When the movable member 212 is in the first position, the battery pack 400 is subjected to force only by the second elastic member 2131, providing basic restraint pressure.

[0108] During use, the battery pack 400 will continuously charge and discharge. During this process, the battery pack 400 will continuously expand or contract, causing the moving part 212 to move back and forth relative to the battery pack. When the moving part 212 moves to the second position and approaches the fixed part 211, it indicates that the battery pack has expanded significantly. At this time, the first elastic part 2132 also begins to apply force, working together with the second elastic part 2131 to provide greater restraint pressure.

[0109] By designing the second elastic element 2131 and the first elastic element 2132 to function in different positions, the tray can automatically adjust the applied pressure according to the degree of expansion of the battery pack 400. When the battery pack 400 expands significantly, the intervention of the first elastic element 2132 increases the uniform distribution of constraint pressure, and this pressure can be maintained within a suitable range as the battery pack expands. The dynamically adjusted pressure helps maintain the performance of the battery pack.

[0110] In some possible implementations, the tray also includes a second fixing plate 110, which is disposed opposite to the first fixing plate 120.

[0111] The space between the second fixed plate 110 and the movable plate 220 can be used to accommodate the battery pack 400.

[0112] It is known that the first fixing plate 120 and the second fixing plate 110 form a space for accommodating the battery pack 400; the elastic component 210 provides a continuous, dynamic force to move the movable plate 220 toward the first fixing plate 120.

[0113] In some embodiments, the fastener 211 is a bolt. Using the fastener 211 as a bolt allows the fixed distance between the first elastic member 2132 and the first fixing plate 120 to be adjustable. For example, by rotating the bolt, the distance between the first elastic member 2132 and the first fixing plate 120 can be lengthened or shortened, thereby fine-tuning the constraint force on the battery pack outside the range of elastic deformation of the first elastic member 2132.

[0114] Furthermore, the fastener 211 can be a countersunk adjustable bolt, which ensures that the fastener 211 will not affect the installation of the first fixing plate 120 on the equipment during use.

[0115] In some embodiments, the fastener 211 may also be a snap-fit ​​structure, which achieves fixation through a snap-fit ​​mechanism, facilitating quick assembly and adjustment.

[0116] In some embodiments, the fastener 211 may also be a slot or tenon joint. By designing a slot on the first fixing plate 120, the fastener 211 can be inserted and fixed by the tenon, providing a stable mechanical connection.

[0117] It should be noted that as long as the fastener 211 can fix the first fixing plate 120 and the first elastic member 2132, the specific structure and form of the fastener 211 in this embodiment of the application are not subject to too many restrictions.

[0118] In some possible implementations, the pallet also includes a side beam 300 connected to the first fixing plate 120, the side beam 300 extending in a direction parallel to the extension and retraction direction of the elastic component 210.

[0119] The movable plate 220 is provided with at least one roller, and the side beam 300 is provided with at least one contact part. The roller and the contact part are correspondingly arranged and make rolling contact.

[0120] It is known that when the movable plate 220 approaches or moves away from the second fixed plate 110, the roller rolls on the contact part, thereby achieving smooth movement. The rolling contact between the roller and the contact part reduces the friction when the movable plate 220 moves, making the movement of the movable plate 220 more stable and efficient.

[0121] The design of the rollers and contact parts ensures the stability and efficiency of the movement of the movable plate 220, reducing energy loss and component wear due to friction; through the rolling contact, the tray can more effectively adjust the applied pressure to adapt to the expansion and contraction of the battery.

[0122] In some possible implementations, the movable plate 220 is provided with a plurality of rollers.

[0123] The edge beam 300 is provided with multiple contact parts, which are arranged at intervals along the height direction of the edge beam 300.

[0124] The design of multiple rollers and contact points provides multi-point support, enabling the movable plate 220 to move smoothly when pressure is applied or released, avoiding lateral displacement or tilting; the design of multiple rollers and contact points ensures the stability and accuracy of the movement of the movable plate 220, reducing energy loss and component wear due to friction.

[0125] In some embodiments, the pallet also has a limiting member disposed on the side beam 300 to limit the sliding of the rollers on the contact portion, thereby limiting the movement distance of the movable plate 220 toward the first fixed plate 120.

[0126] Furthermore, the limiting member is located at one end of the contact portion near the first fixing plate 120.

[0127] like Figure 3-5As shown, specifically, when the battery pack is installed and stacked, the movable plate 220 is in the first position, the second spring 21321a is not under force, and the second spring 21321a is not in contact with the pushing part 21322. At this time, the battery pack will exert an initial force F on the movable plate 220. The movable plate 220 applies the same force F to the moving part 212 of the elastic component 210. The pushing part 21322 is moved towards the fixed part 211 by the force F1, which drives the first spring 21321b to press towards the fixed part 211. The first spring 21321b applies a spring force F4 opposite to F1. At the same time, the second elastic member 2131 is pressed towards the fixed part 211 by the moving part 212, and the second elastic member 2131 provides a spring force F5 in the opposite direction. At this time, the battery pack is subjected to an initial restraining force, which satisfies the minimum pressure suitable for the battery capacity state at this time.

[0128] During use, the battery pack 400 continuously charges and discharges, causing it to expand and contract, resulting in the back-and-forth movement of the movable plate 220. In the second position, the movable plate 220 moves towards the first fixed plate 120, continuously applying pressure to the elastic component 210. During this process, the moving component 212 drives the pushing part 21322 to continuously move towards the fixed component 211, contacting the second spring 21231a. The second spring 21231a experiences a downward pressure F2 and provides a spring force F3 in the opposite direction. The magnitude of F3 is related to the compressed length of the second spring 21231a. At this time, the forces acting on the movable plate 220 include F4 + F5 (initial state of the battery pack) + F3 (resultant force of the spring force of the second spring 21231a).

[0129] The movement distance of the movable plate 220 is limited. The contact part of its side beam 300 and the limiting member will limit it, ensuring that the force applied to the elastic component 210 generated by the movement distance of the movable plate 220 is within the allowable elastic deformation range of the second spring 21231a and the first spring 21231b. This ensures that the battery pack receives a suitable restraint force throughout its entire life cycle, reducing the negative impact caused by the continuous charging and discharging of the entire battery pack.

[0130] Specifically, the selection and design of the springs in the second elastic element 2131, the second spring 21321a, and the first spring 21321b involved in the elastic component 210 mainly includes the spring constant, stiffness, dimensions, stress, and lifespan. Among these, the calculation of spring dimensions involves parameters such as the wire diameter, number of coils, spring length, and spring diameter, which need to be reasonably matched according to the working conditions and stress. Furthermore, when the spring is subjected to stress, stress and lifespan calculations need to be considered to ensure the spring's safety and reliability during operation and to predict its service life.

[0131] This application provides a battery pack, including a battery pack 400 and the tray described above.

[0132] The battery pack 400 is located on the side of the movable plate 220 away from the elastic component 210, which is at least used to apply a restraining force to the movable plate 220 toward the battery pack.

[0133] In some embodiments, the battery pack further includes a second fixing plate 110, which is disposed opposite to the first fixing plate 120.

[0134] The battery pack 400 is disposed between the second fixed plate 110 and the movable plate 220. The second fixed plate 110 abuts against the first end of the battery pack 400, and the movable plate 220 abuts against the second end of the battery pack 400.

[0135] The second fixed plate 110 abuts against the first end of the battery pack 400 to provide fixed support, and the movable plate 220 abuts against the second end of the battery pack 400 to dynamically adjust its position according to the expansion and contraction of the battery.

[0136] In some embodiments, an insulating buffer layer is provided between the battery pack 400 and the first fixing plate 120. This layer not only provides electrical insulation to prevent electrical short circuits between the battery pack 400 and the fixing plate 120 and ensure the safe operation of the battery pack 400, but also provides mechanical buffering to absorb and disperse the stress generated by the battery pack 400 during charging and discharging.

[0137] In some embodiments, the battery pack 400 is composed of sub-cells, and every few sub-cells, such as between every two sub-cells, there is a flexible buffer layer.

[0138] The flexible buffer layer is typically made of materials with elastic and cushioning properties, such as elastic polymers or foam materials. The flexible buffer layer helps to evenly distribute the pressure generated by the expansion of the battery pack 400, reduce local stress concentration, and prevent damage to the battery pack 400 structure. Through modular design and the use of the buffer layer, the system can more flexibly adapt to changes in the thickness of the sub-cells and provide more stable pressure conditions. The buffer layer reduces direct mechanical contact and friction between sub-cells, thereby reducing the risk of fatigue damage and extending the battery's lifespan.

[0139] This application provides an electrical device, including an electrical appliance and the aforementioned battery pack, wherein the battery pack is used to provide electrical energy to the electrical appliance.

[0140] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0141] In the description of this utility model, it should be understood that the terms "comprising" and "having" as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0142] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a unit. Connections can be direct or indirect, via an intermediate medium, and can refer to internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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. 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 this utility model.

Claims

1. A tray, characterized in that, Includes a first fixing plate (120) and a restraint device (200); The restraint device (200) includes an elastic component (210) and a movable plate (220); One end of the elastic component (210) is disposed on the first fixed plate (120), and the other end of the elastic component (210) is connected to the movable plate (220). The elastic component (210) is at least used to apply a pushing force toward the battery pack (400) to the movable plate (220).

2. The pallet according to claim 1, characterized in that, The elastic component (210) includes at least one first elastic element (2132); The first elastic element (2132) includes a support element (21323) and a first spring (21321b); The support member (21323) is disposed in one of the first fixed plate (120) and the movable plate (220); the first spring (21321b) is disposed in the other of the first fixed plate (120) and the movable plate (220), and the first spring (21321b) is connected to the support member (21323).

3. The pallet according to claim 2, characterized in that, The support member (21323) is provided with a guide groove (21324); The first elastic member (2132) further includes a pushing part (21322), one end of which is connected to the movable plate (220), and the other end of which passes through the guide groove (21324) and slides in contact with the support member (21323). The support member (21323) is disposed on the first fixed plate (120), and the first spring (21321b) is sleeved on the outer periphery of the pushing part (21322).

4. The tray according to claim 3, characterized in that, The first elastic element (2132) further includes a second spring (21321a); The second spring (21321a) is disposed in the guide groove (21324), and the second spring (21321a) and the pusher (21322) are connected or spaced apart.

5. The tray according to claim 4, characterized in that, The first elastic element (2132) is configured as follows: When the movable plate (220) is in the first position, the first spring (21321b) abuts against the support member (21323), and the second spring (21321a) does not contact the pushing part (21322); When the movable plate (220) is in the second position, the second position is closer to the first fixed plate (120) than the first position; the first spring (21321b) abuts against the support member (21323), and the second spring (21321a) abuts against the pushing part (21322).

6. The pallet according to claim 2, characterized in that, The number of the first elastic element (2132) is multiple, and the multiple first elastic elements (2132) are arranged at intervals.

7. The pallet according to claim 2, characterized in that, The elastic component (210) includes at least one second elastic element (2131), which is connected to the first fixed plate (120), and one end of the second elastic element (2131) away from the first fixed plate (120) is connected to the movable plate (220).

8. The tray according to claim 7, characterized in that, The number of the second elastic members (2131) is multiple, and the multiple second elastic members (2131) surround the outside of the first elastic member (2132).

9. The tray according to claim 7, characterized in that, The second elastic element (2131) is configured as a foldable elastic metal sheet.

10. The tray according to claim 7, characterized in that, The elastic component (210) further includes a fixing member (211) and a moving member (212); The fixing member (211) is disposed on the first fixing plate (120), and the moving member (212) is disposed on the movable plate (220); The support member (21323) is disposed on the surface of the fixing member (211) away from the first fixing plate (120), and the first spring (21321b) is disposed on the surface of the moving member (212) away from the movable plate (220); One end of the second elastic member (2131) is connected to the fixed member (211), and the other end of the second elastic member (2131) is connected to the movable member (212).

11. The tray according to claim 1, characterized in that, It also includes a second fixing plate (110), which is disposed opposite to the first fixing plate (120); The second fixed plate (110) and the movable plate (220) can be used to accommodate the battery pack (400).

12. The tray according to any one of claims 1-11, characterized in that, It also includes a side beam (300) connected to the first fixed plate (120), and the extension direction of the side beam (300) is parallel to the extension direction of the elastic component (210); The movable plate (220) is provided with at least one roller, and the side beam (300) is provided with at least one contact part. The roller is provided in correspondence with the contact part and makes rolling contact.

13. The pallet according to claim 12, characterized in that, The movable plate (220) is provided with a plurality of the rollers; The side beam (300) is provided with a plurality of contact portions, which are arranged sequentially at intervals along the height direction of the side beam (300).

14. A battery pack, characterized in that, Includes a battery pack (400) and a tray as described in any one of claims 1-13; The battery pack (400) is located on the side of the movable plate (220) away from the elastic component (210), and the elastic component (210) is at least used to apply a pushing force to the movable plate (220) to move toward the battery pack (400).

15. The battery pack according to claim 14, characterized in that, It also includes a second fixing plate (110), which is disposed opposite to the first fixing plate (120); The battery pack (400) is disposed between the second fixed plate (110) and the movable plate (220), the second fixed plate (110) abuts against the first end of the battery pack (400), and the movable plate (220) abuts against the second end of the battery pack (400).

16. An electrical appliance, characterized in that, It includes an electrical device and a battery pack as described in claim 14 or 15, the battery pack being used to provide electrical power to the electrical device.

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