Battery device, battery pack and electric equipment

Abstract

The utility model provides a battery device, a battery pack and electric equipment, and relates to the technical field of batteries. The battery device comprises a supporting frame, an elastic structure, a driving structure and a battery cell group, the driving structure is arranged on the supporting frame and comprises a telescopic part, and the telescopic part abuts against the first end, in the first direction, of the battery cell set; the first end of the elastic structure is arranged on the supporting frame, the second end of the elastic structure can stretch out and draw back in the first direction, and the second end of the elastic structure abuts against the second end, in the first direction, of the battery cell set; the driving structure and the elastic structure are configured as follows: when the length of the battery cell group in the first direction is reduced, the elastic structure extends, and the telescopic part moves towards the battery cell group; when the length of the battery cell group is increased along the first direction, the elastic structure is shortened, and the telescopic part moves away from the battery cell group. According to the battery device provided by the embodiment of the invention, the deformation difference can be dynamically compensated according to the thickness change of the battery cell group, and the stability of the restraining force is dynamically ensured.

Description

Technical Field

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

[0002] During charge-discharge cycles, the volume of electrode materials changes due to lithium-ion insertion and extraction, generating periodic expansion forces. Without effective restraint, these expansion forces can cause cell deformation, interface peeling, or module structural failure, directly impacting the safety, cycle life, and energy density of the battery system.

[0003] Existing technologies primarily control expansion forces through the restraint beams of the module structure or the structural strength of the enclosure itself. For example, aluminum alloy end plates are used in conjunction with bolts to press the battery cells into the module frame; or the closed structure of the enclosure frame is used to constrain overall deformation, relying on the yield strength of the enclosure material to resist the expansion stress of the battery cells.

[0004] However, the thickness of the battery cell changes during the charging and discharging process. The rigid constraint method mentioned above is difficult to dynamically adjust according to the real-time status of the battery cell, which can easily lead to insufficient or excessive restraint force. Utility Model Content

[0005] This application provides a battery device, battery pack, and electrical equipment that can dynamically compensate for deformation differences based on changes in the thickness of the battery cell, thereby dynamically ensuring the stability of the restraint force.

[0006] In a first aspect, this application provides a battery device, including a support frame, an elastic structure, a drive structure, and a battery cell assembly;

[0007] The drive structure is placed on the support frame, and the drive structure includes a telescopic part, which abuts against the first end of the battery cell assembly along the first direction.

[0008] The first end of the elastic structure is disposed on the support frame, the second end of the elastic structure can extend and retract along the first direction, and the second end of the elastic structure abuts against the second end of the battery cell assembly along the first direction;

[0009] The driving structure and the elastic structure are configured such that when the length of the battery cell assembly decreases along the first direction, the elastic structure extends and the telescopic portion moves toward the battery cell assembly; when the length of the battery cell assembly increases along the first direction, the elastic structure shortens and the telescopic portion moves away from the battery cell assembly.

[0010] As an optional implementation, the elastic structure is a disc spring.

[0011] As an optional implementation, the number of disc springs is multiple, and the multiple disc springs are stacked along the first direction.

[0012] As an optional implementation, the inner side of the disc spring protrudes towards the battery cell assembly, and the outer edge of the disc spring abuts against the support frame.

[0013] As an optional implementation, the disc spring has an abutment area on its inner side, the battery cell assembly has a contact surface, and the abutment area is disposed toward the contact surface.

[0014] As an optional implementation, the outer edge area of ​​the abutment region is less than or equal to the area of ​​the contact surface;

[0015] Alternatively, the area of ​​the abutting region is larger than the area of ​​the contact surface.

[0016] As an optional implementation, a separator is provided at the second end of the battery cell assembly, the contact surface contacts the first surface of the separator, and the abutment area contacts the second surface of the separator.

[0017] As an optional implementation, a detection element is also included, which is disposed on the telescopic portion and is used to detect the pressure between the telescopic portion and the first end of the battery cell assembly.

[0018] As an optional implementation, both the detection element and the driving structure are electrically connected to the battery cell assembly.

[0019] Secondly, this application provides a battery pack, including a frame and any of the above-mentioned battery devices;

[0020] The support frame is disposed within the border.

[0021] As an optional implementation, the number of battery devices is multiple, and the multiple battery devices are arranged at intervals along the second direction;

[0022] The second direction is perpendicular to the first direction.

[0023] Thirdly, this application provides an electrical device, including a vehicle body and any of the above-mentioned battery devices, wherein the battery device is used to supply power to the vehicle body;

[0024] Alternatively, it may include a vehicle body and any of the aforementioned battery packs, the battery packs being used to power the vehicle body.

[0025] As an alternative implementation, the electrical device includes a battery pack, a frame that can be reused to form the vehicle body, and the frame that can support the electrical components of the vehicle body.

[0026] The battery device, battery pack, and electrical equipment provided in this application embodiment include a support frame, an elastic structure, a drive structure, and a battery cell assembly. The drive structure is placed in the support frame and includes a telescopic portion that abuts against a first end of the battery cell assembly along a first direction. The first end of the elastic structure is disposed in the support frame, and the second end of the elastic structure is telescopic along the first direction, abutting against a second end of the battery cell assembly along the first direction. The drive structure and the elastic structure are configured such that when the length of the battery cell assembly along the first direction decreases, the elastic structure extends and the telescopic portion moves toward the battery cell assembly; when the length of the battery cell assembly along the first direction increases, the elastic structure shortens and the telescopic portion moves away from the battery cell assembly.

[0027] The elastic structure can automatically adjust its length according to the real-time status of the battery pack, reducing stress concentration caused by thickness changes and providing necessary buffering and compensation for the battery pack. The drive structure, through its telescopic section, provides active mechanical support for the battery pack, ensuring that the battery pack is effectively restrained when it expands or contracts.

[0028] Through the synergistic effect of the elastic structure and the driving structure, this battery device can dynamically adapt to the thickness changes of the cell pack during charging and discharging, effectively reducing the risk of stress concentration and structural failure, and possessing good reliability and stability. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application;

[0031] Figure 2 for Figure 1 Cross-section of a moderately elastic structure Figure 1 ;

[0032] Figure 3 for Figure 1 Cross-section of a moderately elastic structure Figure 2 ;

[0033] Figure 4 A schematic diagram of the connection structure of the elastic structure, separator and cell assembly in the battery device provided in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the battery pack provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100-Support frame;

[0037] 200 - Elastic structure;

[0038] 210 - Disc spring; 211 - Contact area;

[0039] 300-Drive Structure;

[0040] 310 - Telescopic part;

[0041] 400-cell pack;

[0042] 410 - Contact surface;

[0043] 500-partition;

[0044] 600 - Inspection Items;

[0045] 700 - Border.

[0046] 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

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0048] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0050] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0051] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0052] As the background technology knows, battery cells generate periodic expansion forces during charge-discharge cycles. Without effective restraint, these expansion forces can cause cell deformation, interface peeling, or module structure failure, directly affecting the safety, cycle life, and energy density of the battery system.

[0053] Existing technologies primarily control expansion forces through the structural strength of the module restraint beams or the enclosure itself. For example, aluminum alloy end plates are used in conjunction with bolts to press the battery cells into the module frame; or the closed structure of the enclosure frame is used to constrain overall deformation, relying on the yield strength of the enclosure material to resist the expansion stress of the battery cells.

[0054] However, the thickness of the battery cell changes during the charging and discharging process. The rigid constraint method mentioned above is difficult to dynamically adjust according to the real-time status of the battery cell, which can easily lead to insufficient or excessive restraint force.

[0055] Furthermore, the thickness change of the battery cell during charging and discharging has nonlinear characteristics. Traditional rigid constraints cannot dynamically compensate for the deformation differences, which can easily lead to stress concentration or constraint failure in local areas, ultimately affecting the long-term performance and safety of the battery pack.

[0056] In view of the above, this application provides a battery device, a battery pack, and a vehicle body. The battery device includes a support frame, an elastic structure, a drive structure, and a cell assembly. The drive structure is placed in the support frame and includes a telescopic portion that abuts against a first end of the cell assembly along a first direction. The first end of the elastic structure is disposed in the support frame, and the second end of the elastic structure is telescopic along the first direction, abutting against a second end of the cell assembly along the first direction. The drive structure and the elastic structure are configured such that when the length of the cell assembly along the first direction decreases, the elastic structure extends and the telescopic portion moves toward the cell assembly; when the length of the cell assembly along the first direction increases, the elastic structure shortens and the telescopic portion moves away from the cell assembly.

[0057] The drive structure provides active mechanical support to the battery pack through its telescopic section. When the battery pack expands, the telescopic section of the drive structure moves away from the battery pack, reducing the pressure on the battery pack; when the battery pack contracts, the telescopic section moves towards the battery pack, increasing the support for the battery pack. This dynamic adjustment mechanism ensures that the battery pack remains in a safe stress state throughout the entire charge and discharge cycle.

[0058] The thickness of the battery cell pack changes during charging and discharging. The elastic structure adapts to these changes through its stretchability, providing effective buffering and compensation for the battery cell pack. This prevents the battery cell pack from being subjected to excessive mechanical stress when it expands or contracts, thus protecting the structural integrity of the battery cell pack.

[0059] Through the synergistic effect of the elastic structure and the driving structure, the battery device can dynamically adapt to the thickness changes of the cell pack during charging and discharging, so that the battery pack remains in a stable stress state, effectively reducing the risk of stress concentration and structural failure, and has good reliability and stability.

[0060] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0061] Combination Figure 1As shown, a first aspect of this application provides a battery device, including a support frame 100, an elastic structure 200, a drive structure 300, and a cell assembly 400. The drive structure 300 is placed in the support frame 100 and includes a telescopic portion 310, which abuts against a first end of the cell assembly 400 along a first direction. The first end of the elastic structure 200 is disposed in the support frame 100, and the second end of the elastic structure 200 is telescopic along the first direction, abutting against a second end of the cell assembly 400 along the first direction. The drive structure 300 and the elastic structure 200 are configured such that when the length of the cell assembly 400 along the first direction decreases, the elastic structure 200 extends, and the telescopic portion 310 moves toward the cell assembly 400; when the length of the cell assembly 400 along the first direction increases, the elastic structure 200 shortens, and the telescopic portion 310 moves away from the cell assembly 400.

[0062] It should be noted that the first direction is... Figure 1 The direction indicated by the middle arrow X is parallel.

[0063] Understandably, the cell pack 400 is the core component of the battery device, responsible for storing and releasing electrical energy. The cell pack 400 typically includes multiple cells, which are arranged along a first direction within the support frame 100.

[0064] The support frame 100 is disposed on the outside of the cell assembly 400 to limit and support the cell assembly 400. During the charging process of the cell assembly 400, the volume of the cell may expand, and when the cell expands, the total length of the cell assembly 400 within the support frame 100 along the first direction will increase; during the discharging process of the cell assembly 400, the volume of the cell may shrink, and when the cell shrinks, the total length of the cell assembly 400 within the support frame 100 along the first direction will decrease.

[0065] The elastic structure 200 is disposed within the support frame 100 and abuts against the second end of the battery cell assembly 400 along the first direction.

[0066] One end of the elastic structure 200 is fixed to the support frame 100, and the other end can extend and retract along the first direction. Therefore, when the total length of the battery cell assembly 400 changes along the first direction, the elastic structure 200 can adaptively extend and retract to accommodate the changes in the battery cell assembly 400, providing dynamic buffering and compensation for the battery cell assembly 400. This ensures that the battery cell assembly 400 is not subjected to excessive mechanical stress during expansion or contraction, protecting the structural integrity of the battery cell assembly 400.

[0067] The drive structure 300 can be disposed inside the support frame 100, and the telescopic portion 310 of the drive structure 300 abuts against the first end of the battery cell assembly 400 along the first direction. Alternatively, the drive structure 300 can be disposed outside the support frame 100, and the telescopic portion 310 of the drive structure 300 extends to the inside of the support frame 100 and abuts against the first end of the battery cell assembly 400 along the first direction.

[0068] The drive structure 300 includes a telescopic portion 310 that abuts against one end of the battery cell assembly 400. The drive structure 300 can be adjusted according to the real-time state of the battery cell assembly 400. When the battery cell assembly 400 expands, the telescopic portion 310 of the drive structure 300 moves outward from the support frame 100 to reduce the pressure on the battery cell assembly 400; when the battery cell assembly 400 contracts, the telescopic portion 310 moves inward from the support frame 100 to increase support for the battery cell assembly 400, ensuring appropriate constraint force under different charge and discharge states. This dynamic adjustment mechanism ensures that the battery cell assembly 400 remains in a safe stress state throughout the entire charge and discharge cycle.

[0069] Specifically, the battery cell assembly 400 undergoes volume changes during charging and discharging. The elastic structure 200 provides necessary buffering and compensation, automatically adjusting its length according to the real-time state of the battery cell assembly 400 to reduce stress concentration caused by thickness changes. The drive structure 300, through its telescopic portion 310, provides active mechanical support, ensuring that the battery cell assembly 400 remains in a safe stress state during expansion or contraction.

[0070] Through the synergy of the elastic structure 200 and the drive structure 300, the cell assembly 400 can remain stable under these changes, effectively reducing the risk of stress concentration and structural failure. This design ensures that the cell assembly 400 can effectively convert energy under different operating conditions while maintaining structural stability.

[0071] Combination Figure 2 As shown, in some embodiments, the elastic structure 200 is a disc spring 210.

[0072] Understandably, the disc spring 210 is a spring with a special shape, typically conical or disc-shaped, possessing high load capacity and low deformation. Due to its shape and characteristics, the disc spring 210 can provide a large elastic force within a small space, contributing to the compact design of battery devices.

[0073] The disc spring 210 can withstand a large load and provide sufficient reaction force when the battery cell assembly 400 expands, ensuring that the battery cell assembly 400 is properly constrained during the expansion process. Similarly, the disc spring 210 can also provide necessary support when the battery cell assembly 400 contracts, preventing the battery cell assembly 400 from loosening or deforming due to lack of support.

[0074] In summary, by setting the disc spring 210, different elastic characteristics are exhibited under different load conditions, enabling the battery device to dynamically respond to the real-time state of the cell pack 400 and maintain a stable stress state.

[0075] It should be noted that the inner cone height and material thickness of the disc spring 210 can be determined in conjunction with the actual restraint force required by the battery pack 400, and this application embodiment does not impose any restrictions on this.

[0076] Combination Figure 3 As shown, in some embodiments, there are multiple disc springs 210, and the multiple disc springs 210 are stacked along the first direction.

[0077] Understandably, by stacking multiple disc springs 210, the overall structure can withstand a greater load. This can cope with the large expansion force generated by the battery cell assembly 400 during charging and discharging.

[0078] The stacked disc springs 210 can evenly distribute the load across the entire elastic structure 200, reducing the pressure on a single disc spring 210 and extending its service life. The use of multiple disc springs 210 improves the stability and reliability of the structure and reduces the risk of overall failure due to single-point failure.

[0079] By adjusting the number of layers and arrangement of the disc springs 210, the battery device can dynamically adjust its elastic response to adapt to the thickness changes of the cell pack 400 at different charging and discharging stages.

[0080] It should be noted that the number of disc springs 210 can be determined in conjunction with the actual restraint force required by the battery pack 400, and this application embodiment does not impose any restrictions on this.

[0081] Since the stacked disc springs 210 have a longer length in the first direction, they may affect the compactness of the battery device. In order to ensure sufficient constraint force, the battery device can be provided with multiple sets of elastic structures 200, each set of elastic structures 200 is provided with several stacked disc springs 210. In this way, the compactness of the battery device can be guaranteed, and the necessary buffer and compensation can be provided for the cell assembly 400, reducing the risk of stress concentration and structural failure.

[0082] Combination Figures 1 to 3 As shown, in some embodiments, the inner side of the disc spring 210 protrudes towards the battery cell assembly 400, and the outer edge of the disc spring 210 abuts against the support frame 100.

[0083] By having the disc spring 210 protrude from the inside toward the cell assembly 400 and its outer edge abut against the support frame 100, the battery device can achieve more efficient force transmission and support.

[0084] Specifically, when the battery cell assembly 400 expands, it will compress the inner side of the disc spring 210, causing the disc spring 210 to deform and its height along the first direction to decrease, while storing rebound force inside; when the battery cell assembly 400 contracts, under the action of the rebound force, the height of the disc spring 210 along the first direction gradually recovers, and the disc spring 210 can always maintain contact with the battery cell assembly 400.

[0085] In some embodiments, the disc spring 210 has an abutment region 211 on its inner side, and the battery cell assembly 400 has a contact surface 410, with the abutment region 211 disposed toward the contact surface 410.

[0086] The contact area 211 can ensure more effective contact between the disc spring 210 and the battery cell assembly 400, optimize the force transmission path, ensure the contact stability between the disc spring 210 and the battery cell assembly 400, and reduce the risk of functional failure due to poor contact.

[0087] The contact area 211 is the outer edge of the end of the disc spring 210 facing the cell assembly 400, and the contact area 211 is annular. In the cell assembly 400, the contact surface 410 is disposed on the surface of the cell closest to the disc spring 210, and the contact area 211 facing the contact surface 410 can achieve effective force transmission.

[0088] The specific location of the contact surface 410 is related to the arrangement direction of the battery cells, and the contact surface 410 is located on the side of the battery cell facing its expansion direction. The contact surface 410 can be the side of the battery cell with a larger surface area or the side of the battery cell with a smaller surface area.

[0089] In some embodiments, when the contact surface 410 is the side with a larger cell surface area, the outer edge area of ​​the abutment region 211 may be less than or equal to the area of ​​the contact surface 410. When the contact surface 410 is the side with a smaller cell surface area, the area of ​​the abutment region 211 may be greater than the area of ​​the contact surface 410.

[0090] By controlling the area relationship between the contact area 211 and the contact surface 410, it is helpful to ensure the uniform distribution of force and reduce local stress concentration.

[0091] Combination Figure 4 As shown, in some embodiments, a separator 500 is provided at the second end of the battery cell assembly 400, the contact surface 410 contacts the first surface of the separator 500, and the abutment area 211 contacts the second surface of the separator 500.

[0092] The area of ​​the first surface of the partition 500 can be greater than or equal to the area of ​​the contact surface 410, and the area of ​​the second surface of the partition 500 can be greater than the area of ​​the abutment region 211.

[0093] Understandably, the separator 500, as an intermediate layer, can effectively disperse and transmit the force from the disc spring 210, ensuring that the force is applied evenly to the cell assembly 400.

[0094] Furthermore, the separator 500 can act as a buffer layer, reducing the mechanical stress directly applied to the cell assembly 400 and protecting the structural integrity of the cell assembly 400.

[0095] The partition 500 increases the contact stability between the battery cell assembly 400 and the disc spring 210, reducing wear and damage caused by direct contact.

[0096] In practice, during the expansion of the cell assembly 400, the expansion force generated will push the partition 500 towards the disc spring 210 to compress the disc spring 210; during the contraction of the cell assembly 400, its volume decreases, and the rebound force accumulated inside the disc spring 210 will act on the partition 500, pushing the partition 500 towards the cell assembly 400, thereby maintaining a certain restraint force in the cell assembly 400 and ensuring the positional stability of each cell in the cell assembly 400.

[0097] Combination Figure 1 As shown, in some embodiments, the battery device further includes a detection element 600 disposed on the telescopic portion 310, which is used to detect the pressure between the telescopic portion 310 and the first end of the cell assembly 400.

[0098] The detection element 600 can acquire pressure data applied to the cell assembly 400 by the telescopic part 310. Through the detection element 600, the battery device can monitor the stress state of the cell assembly 400 in real time, identify abnormal situations in advance, such as excessive expansion or contraction, and adjust the action of the drive structure 300 to achieve dynamic support and protection for the cell assembly 400.

[0099] In practice, the battery cell assembly 400 is constrained by the drive structure 300 and pressed to provide a preset preload force. The force exerted by the drive structure 300 on the battery cell assembly 400 can be transmitted to the disc spring 210 through the battery cell assembly 400, causing the disc spring 210 to deform.

[0100] During the discharge process of the battery cell assembly 400, the battery cells gradually shrink, and the total length of the battery cell assembly 400 in the first direction gradually decreases. At this time, the actual pre-tightening force of the drive structure 300 on the battery cell assembly 400 decreases. When the detection component 600 detects that the pressure between the telescopic part 310 and the first end of the battery cell assembly 400 is less than the preset pre-tightening force, the drive structure 300 runs to extend the telescopic part 310 towards the battery cell assembly 400 to adapt to the shrinkage of the battery cell assembly 400 and maintain the preset pre-tightening force on the battery cell assembly 400.

[0101] During the charging process of the battery cell assembly 400, the battery cells gradually expand, and the total length of the battery cell assembly 400 in the first direction gradually increases. At this time, the actual pre-tightening force of the drive structure 300 on the battery cell assembly 400 increases. When the detection component 600 detects that the pressure between the telescopic part 310 and the first end of the battery cell assembly 400 is greater than the preset pre-tightening force, the drive structure 300 operates to retract the telescopic part 310 away from the battery cell assembly 400 to adapt to the expansion of the battery cell assembly 400 and maintain the preset pre-tightening force on the battery cell assembly 400.

[0102] During the charging and discharging process of the battery cell assembly 400, the disc spring 210 can adapt to the volume change of the battery cell assembly 400 by undergoing elastic deformation, so as to buffer and adjust the battery cell assembly 400, and enable the battery cell assembly 400 to remain within the restraint force requirement range within the reaction time of the drive structure 300, thereby achieving "stepless" adjustment of the restraint force.

[0103] For example, the detection element 600 can be a patch pressure sensor that acquires the expansion force data of the battery cell assembly 400 during operation, and transmits and feeds it back to the drive structure 300 through the battery management system so as to dynamically adjust the motor power of the drive structure 300 and control the extension and retraction of the telescopic part 310 to ensure that the process expansion force is kept within the required range of the preset preload.

[0104] In some embodiments, both the detection element 600 and the drive structure 300 are electrically connected to the battery pack 400.

[0105] Understandably, the battery cell assembly 400 can directly power the drive structure 300 and the detection device 600, reducing energy transmission loss and improving the overall energy efficiency of the battery device.

[0106] Combination Figure 5 As shown, a second aspect of this application provides a battery pack, including a frame 700 and a battery device provided in any of the above embodiments, with a support frame 100 disposed within the frame 700.

[0107] The battery device has been described in detail in the above embodiments and will not be repeated here.

[0108] Both the drive structure 300 and the support frame 100 can directly abut against the inner wall of the frame 700 on the side closest to the elastic structure 200, so that the frame 700 can bear the expansion force from the battery cell.

[0109] In some embodiments, the number of battery devices is multiple, and the multiple battery devices are arranged at intervals along a second direction; the second direction is perpendicular to the first direction.

[0110] It should be noted that the first direction is... Figure 5 The X direction is consistent with the second direction. Figure 5 The Y-axis is consistent.

[0111] By integrating multiple battery devices into a battery pack, the total capacity and energy density of the battery pack can be significantly increased. Arranging multiple battery devices perpendicularly along a second direction allows for an increase in the number of battery devices within a limited cross-sectional area, thereby improving the overall capacity.

[0112] The spaced arrangement of multiple battery units can provide better ventilation and thermal management conditions, help improve airflow between battery units, thereby enhancing heat dissipation performance and reducing heat buildup between battery units.

[0113] Combination Figure 5 As shown, a third aspect of this application provides an electrical device, including a vehicle body and any of the above-described battery devices, wherein the battery device is used to supply power to the vehicle body.

[0114] Alternatively, the electrical equipment may include the vehicle body and any of the aforementioned battery packs, with the battery packs used to power the vehicle body.

[0115] The battery device and battery pack have been described in detail in the above embodiments and will not be repeated here.

[0116] For example, the electrical equipment could be an electric vehicle. The vehicle body forms the main structure of the electrical equipment and includes various electrical components, such as control modules and sensors.

[0117] Understandably, traditional rigid constraints can only meet the requirements of conventional expansion forces. For higher levels of preload (such as scenarios exceeding the stiffness of structural components or the yield strength of materials), conventional structures are no longer able to effectively constrain cell deformation due to insufficient strength, leading to a significant increase in the risk of structural failure.

[0118] In some embodiments, the electrical equipment includes a battery device, a support frame 100 of the battery device is disposed on the vehicle body, and the drive structure 300 and the side of the support frame 100 near the elastic structure 200 can directly abut against the frame of the vehicle body.

[0119] This configuration allows the steel frame of the vehicle body to bear the expansion force from the battery cells. Compared with traditional constraint methods, it can better cope with scenarios that exceed the stiffness of structural components or the yield strength of materials. It can effectively withstand the high-level expansion force from the battery cell assembly and reduce the risk of structural failure.

[0120] Furthermore, by directly abutting the battery device support frame 100 and drive structure 300 against the vehicle frame, and using the vehicle frame structure to support the battery cell assembly 400, the integration of the vehicle body is improved, achieving the integration of structure and function.

[0121] In some embodiments, the electrical equipment includes a battery pack, the frame 700 can be reused to form a vehicle body, and the frame 700 can support electrical components of the vehicle body.

[0122] The frame 700 of the battery pack is used to form the body, so the steel structure of the body can bear the expansion force from the battery cells. Compared with the traditional constraint method, it can better cope with the scenario that exceeds the stiffness of the structural components or the yield strength of the material. It can effectively withstand the high-level expansion force from the battery cell group 400 and reduce the risk of structural failure.

[0123] Furthermore, the vehicle body also serves as the frame for the battery pack 700, which improves the integration of the vehicle body and helps optimize the utilization of the interior space.

[0124] In summary, the battery device provided in this application embodiment utilizes the detection element 600 to monitor the stress state of the cell assembly 400 in real time, and provides active mechanical support to the cell assembly 400 through the expansion and contraction performance of the drive structure 300. Simultaneously, the disc spring 210 can adaptively undergo elastic deformation with changes in the volume of the cell assembly 400, thereby buffering and adjusting the cell assembly 400, ensuring that the cell assembly 400 remains within the required restraint force range within the reaction time of the drive structure 300. This battery device can dynamically adapt to the thickness changes of the cell assembly 400 during charging and discharging, maintaining the cell assembly 400 in a stable stress state, effectively reducing the risk of stress concentration and structural failure, and exhibiting good reliability and stability.

[0125] Finally, it should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of the present application. The embodiments of this application are intended to cover any variations, uses, or adaptations of the embodiments of this application that follow the general principles of the embodiments of this application and include common knowledge or customary technical means in the art not disclosed in the embodiments of this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the embodiments of this application are indicated by the following claims.

[0126] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

Claims

1. A battery device, characterized in that, It includes a support frame (100), an elastic structure (200), a drive structure (300), and a battery cell assembly (400); The drive structure (300) is placed on the support frame (100), and the drive structure (300) includes a telescopic part (310), which abuts against the first end of the battery cell assembly (400) along the first direction; The first end of the elastic structure (200) is disposed on the support frame (100), the second end of the elastic structure (200) can extend and retract along the first direction, and the second end of the elastic structure (200) abuts against the second end of the battery cell assembly (400) along the first direction; The drive structure (300) and the elastic structure (200) are configured such that when the length of the battery cell assembly (400) decreases along the first direction, the elastic structure (200) extends and the telescopic portion (310) moves toward the battery cell assembly (400); when the length of the battery cell assembly (400) increases along the first direction, the elastic structure (200) shortens and the telescopic portion (310) moves away from the battery cell assembly (400).

2. The battery device according to claim 1, characterized in that, The elastic structure (200) is a disc spring (210).

3. The battery device according to claim 2, characterized in that, The number of disc springs (210) is multiple, and the multiple disc springs (210) are stacked along the first direction.

4. The battery device according to claim 2, characterized in that, The inner side of the disc spring (210) protrudes towards the battery cell assembly (400), and the outer edge of the disc spring (210) abuts against the support frame (100).

5. The battery device according to claim 4, characterized in that, The disc spring (210) has an abutment area (211) on its inner side, and the battery cell assembly (400) has a contact surface (410), with the abutment area (211) facing the contact surface (410).

6. The battery device according to claim 5, characterized in that, The outer edge area of ​​the abutting region (211) is less than or equal to the area of ​​the contact surface (410); Alternatively, the area of ​​the contact area (211) is greater than the area of ​​the contact surface (410).

7. The battery device according to claim 6, characterized in that, The second end of the battery cell assembly (400) is provided with a separator (500), the contact surface (410) is in contact with the first surface of the separator (500), and the abutment area (211) is in contact with the second surface of the separator (500).

8. The battery device according to any one of claims 1-7, characterized in that, It also includes a detection element (600) disposed on the telescopic part (310), the detection element (600) being used to detect the pressure between the telescopic part (310) and the first end of the battery cell assembly (400).

9. The battery device according to claim 8, characterized in that, Both the detection element (600) and the driving structure (300) are electrically connected to the battery cell assembly (400).

10. A battery pack, characterized in that, Includes a frame (700) and a battery device as described in any one of claims 1-9; The support frame (100) is disposed within the border (700).

11. The battery pack according to claim 10, characterized in that, The number of battery devices is multiple, and the multiple battery devices are arranged at intervals along the second direction; The second direction is perpendicular to the first direction.

12. An electrical appliance, characterized in that, The vehicle includes a body and a battery device as described in any one of claims 1-9, the battery device being used to power the vehicle body; Alternatively, it may include a vehicle body and a battery pack as described in claim 10 or 11, the battery pack being used to power the vehicle body.

13. The electrical equipment according to claim 12, characterized in that, The electrical equipment includes a battery pack, and the frame (700) can be reused to form the vehicle body, the frame (700) supporting the electrical components of the vehicle body.

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