Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a battery cell, a battery end plate and a binding belt. The binding belt is used for binding the battery end plate and the battery cell. The battery end plate comprises an end plate body, the end plate body is provided with a mounting portion matched with the binding belt of the battery device; and a first limiting piece is detachably arranged on the end plate body. The first limiting piece is located on one side of the mounting portion, and at least a part of the first limiting piece protrudes from the outer surface of the end plate body, so as to limit the binding belt arranged on the mounting portion. In the technical scheme of the embodiment of the application, the first limiting piece is detachably connected with the end plate body, so that the first limiting piece can be connected with the end plate body after the binding belt is matched with the mounting portion. The battery cell can be prevented from being damaged due to extrusion during the installation of the binding belt, the installation of the binding belt is easier, and the risk of damage of the battery cell can be reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. In related technologies, to secure multiple battery cells with straps, the entire set of battery cells needs to be compressed, which can easily damage the individual cells. Utility Model Content

[0003] In view of the above problems, this application provides a battery device and an electrical device that can solve the problem that individual battery cells are easily damaged during the installation process of the strap.

[0004] In a first aspect, this application provides a battery device, including: a battery cell, a battery end plate, and a strap, the strap being used to secure the battery end plate and the battery cell, the battery end plate including: an end plate body having a mounting portion that cooperates with the strap of the battery device; and a first limiting member detachably disposed on the end plate body, the first limiting member being located on one side of the mounting portion, and at least a portion of the first limiting member protruding from the outer surface of the end plate body to limit the strap disposed on the mounting portion.

[0005] In the technical solution of this application embodiment, by setting a first limiting member that can be detachably connected to the end plate body, the first limiting member can be connected to the end plate body after the strap and the mounting part are engaged. Compared with the solution where the first limiting member and the end plate body are integrally formed, it is not necessary to press multiple battery cells to make the first limiting member avoid the strap. The strap can be smoothly placed on the outer periphery of the battery end plate and the battery cells. This can prevent the battery cells from being damaged due to compression during the installation of the strap, making the installation of the strap easier and reducing the risk of damage to the battery cells.

[0006] According to some embodiments of this application, the first limiting member is engaged with the end plate body.

[0007] In the above technical solution, the first limiting member is engaged with the end plate body, which can ensure the connection effect between the first limiting member and the end plate body, and can ensure the fixing effect of the first limiting member, thereby ensuring the limiting effect of the strap, and is easy to disassemble and maintain.

[0008] According to some embodiments of this application, the first limiting member includes: a rod; a deformable spring arm disposed at one end of the rod, the spring arm having a fixing portion at its free end; and a limiting plate disposed at the other end of the rod, wherein the end plate body has an insertion hole, the rod and the spring arm are adapted to be inserted into the insertion hole, the fixing portion of the spring arm is adapted to cooperate with the end plate body, and the limiting plate is limited to one side of the end plate body.

[0009] In the above technical solution, by setting a first limiting member including a plug rod, the first limiting member can be inserted into the end plate body through the plug rod, which is beneficial to fixing the limiting member. Furthermore, by setting a spring arm and a limiting plate at both ends of the plug rod, the fixing parts of the limiting plate and the spring arm can cooperate to clamp the entire first limiting member onto the end plate body. This can improve the connection effect between the first limiting member and the end plate body, improve the fixing effect of the first limiting member, and improve the limiting effect of the strap.

[0010] In some embodiments, the fixing part is adapted to extend out of the insertion hole, and the fixing part abuts against the side of the end plate body opposite to the limiting plate.

[0011] In the above technical solution, by extending the fixing part out of the insertion hole to abut and cooperate with the end plate body, the fixing parts of the limiting plate and the spring arm can cooperate to clamp the entire first limiting member on the end plate body. This can improve the connection effect between the first limiting member and the end plate body, improve the fixing effect of the first limiting member, and improve the limiting effect of the strap.

[0012] In some embodiments, the thickness of the strap is T2, and the thickness of the limiting plate is T1, wherein T1 ≥ T2.

[0013] In the above technical solution, by limiting the thickness of the limiting plate to a range greater than or equal to the thickness of the strap, it is possible to ensure full contact between the strap and the limiting plate, thereby improving the limiting effect on the strap and preventing the strap from detaching from the mounting part due to force.

[0014] In some embodiments, the spring arms include a plurality of spring arms connected to one end of the insert rod and arranged at circumferential intervals along the insert rod.

[0015] In the above technical solution, by setting multiple spring arms on the insertion rod and arranging the multiple spring arms at intervals along the circumference of the insertion rod, the force on the first limiting member can be more uniform, which can improve the reliability and stability of fixing the first limiting member, improve the limiting effect on the strap, improve the structural strength of the first limiting member, and improve the service life of the first limiting member.

[0016] According to some embodiments of this application, the end plate body is provided with a second limiting member, and the strap is limited between the second limiting member and the first limiting member.

[0017] In the above technical solution, by setting a second limiting member, the second limiting member can cooperate with the first limiting member to limit the strap on both sides of the strap, which can improve the limiting effect of the strap, prevent the strap from detaching from the mounting part of the end plate body after installation, and improve the reliability and stability of the strap after installation.

[0018] In some embodiments, the end plate body has a limiting step, the limiting step including a first segment, a connecting segment and a second segment, the first segment being closer to one side edge of the end plate body in the height direction relative to the second segment and having a smaller cross-sectional area than the second segment, the connecting segment connecting the first segment and the second segment and forming the second limiting member.

[0019] In the above technical solution, by setting a limiting step on the end plate body, the cross-sectional area of ​​the limiting step on the side closer to the end plate body is smaller than the cross-sectional area of ​​the limiting step on the side farther from the end plate body, which facilitates the installation of the strap and makes the fit between the strap and the mounting part of the end plate body smoother, thus improving the smoothness of strap installation. Moreover, the limiting step can cooperate with the first limiting member to limit the strap on both sides, thereby improving the limiting effect of the strap and preventing the strap from detaching from the mounting part of the end plate body after installation, thus improving the reliability and stability of the strap after installation.

[0020] According to some embodiments of this application, the surface at the corner of the first segment located at the end of the end plate body in the length direction is a convex arc surface.

[0021] In the above technical solution, by setting the surface of the first segment at the corner of the end plate body to be a convex arc surface, the contact area between the strap and the bottom wall of the limiting groove can be increased, the local force on the strap can be reduced, the strap can be more evenly stressed, the service life of the strap can be improved, the constraint effect on the end plate body can be improved, the constraint effect on the battery cells can be improved, and the fixing effect on multiple battery cells can be improved.

[0022] According to some embodiments of this application, the end plate body has a plurality of extrusion cavities, the end plate body has a length direction and a height direction, each of the extrusion cavities extends along the length direction of the end plate body, and the plurality of extrusion cavities are arranged in the height direction of the end plate body.

[0023] In the above technical solution, by extruding the end plate body in the length direction, the size of the extrusion die can be reduced, and the processing cost can be lowered.

[0024] In some embodiments, the cross-section of the extrusion cavity perpendicular to the length direction of the end plate body is triangular.

[0025] In the above technical solution, by setting the extrusion cavity inside the end plate body as a triangle, the stability of the extrusion cavity structure can be improved, the structural strength of the end plate body can be improved, the stress on the end plate body can be made more uniform, the end plate body can be prevented from breaking under stress, and the service life of the end plate body can be improved.

[0026] According to some embodiments of this application, the end plate body has a height direction, and in the height direction of the end plate body, the thickness dimension of the middle part of the end plate body is greater than the thickness dimension of the opposite sides of the end plate body in the height direction.

[0027] In the above technical solution, by setting the end plate body with a central thickness greater than the edge thickness, the structural strength of the central part of the end plate body can be improved, the deformation of the central part of the end plate body under stress can be reduced, the end plate body can fully resist the expansion force of the battery cell, the constraint effect on the battery cell can be improved, and the end plate body can be prevented from being damaged and failing due to excessive expansion force of the battery cell.

[0028] In some embodiments, at least a portion of the outer surface of the end plate body is a convex arc surface.

[0029] In the above technical solution, by making at least a portion of the surface of the end plate body a convex arc surface, the thickness of the middle part of the end plate body can be increased, the structural strength of the middle part of the end plate body can be improved, the deformation of the middle part of the end plate body under stress can be reduced, so that the end plate body can fully resist the expansion force of the battery cell, improve the constraint effect on the battery cell, and prevent the end plate body from being damaged and failing due to excessive expansion force of the battery cell.

[0030] In some embodiments, the thickness of the end plate body is T3, where 0.2mm≤T3≤0.5mm.

[0031] In the above technical solution, by limiting the thickness of the end plate body to between 0.2mm and 0.5mm, the structural strength of the end plate body can be guaranteed, so that the end plate body can fully resist the expansion force of the battery cell, improve the constraint effect on the battery cell, and prevent the end plate body from being damaged and failing due to excessive expansion force of the battery cell. At the same time, the mass and volume of the end plate body can be reduced, the space occupied by the end plate body can be reduced, and space can be saved.

[0032] In some embodiments, the thickness of the end plate body is T3, where 0.2mm≤T3≤0.3mm.

[0033] In the above technical solution, by limiting the thickness of the end plate body to between 0.2mm and 0.3mm, the structural strength of the end plate body can be guaranteed, so that the end plate body can fully resist the expansion force of the battery cell, improve the constraint effect on the battery cell, and prevent the end plate body from being damaged and failing due to excessive expansion force of the battery cell. At the same time, the mass and volume of the end plate body can be reduced, the space occupied by the end plate body can be reduced, and space can be saved.

[0034] According to some embodiments of this application, the end plate body is provided with mounting holes for mounting pressure strips; and / or, the end plate body is provided with a foolproof marking.

[0035] In the above technical solution, by setting mounting holes on the end plate body, the pressure strip can be installed and fixed, so that the pressure strip can cooperate with the strap, which can improve the fixing effect of multiple battery cells and prevent multiple battery cells from shifting or loosening when the battery device vibrates or is impacted. By setting anti-foolproof marks on the end plate body, it is beneficial to install battery cells and can prevent the positive and negative terminals of battery cells from being installed incorrectly.

[0036] According to some embodiments of this application, the battery cell includes a casing, and the casing wall thickness is D, which satisfies: 0.1mm≤D≤0.5mm.

[0037] In the above technical solution, by limiting the thickness of the outer shell wall to 0.1mm-0.5mm, it is possible to prevent the straps from squeezing multiple battery cells during installation and to prevent multiple battery cells from being damaged due to squeezing. This makes the installation of the straps easier and reduces the risk of damage to the battery cells.

[0038] In the above technical solution, by setting battery end plates on opposite sides of multiple battery cells, and by setting straps that can be wrapped around the battery end plates and the outer periphery of the battery cells, the constraint effect on the battery cells can be improved, and the fixing effect on multiple battery cells can be improved, preventing multiple battery cells from shifting or loosening when the battery device vibrates or is impacted.

[0039] In some embodiments, the strap is a steel strap.

[0040] In the above technical solution, using steel straps as binding straps can improve the structural strength of the binding straps, increase the constraint force on the battery end plate, improve the constraint effect on the battery cells, improve the fixing effect on multiple battery cells, and prevent the battery cells from shifting or loosening when the battery device vibrates or is impacted.

[0041] Secondly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy. Therefore, by using the aforementioned battery device, damage to individual battery cells due to compression during the installation process with straps can be prevented, thus reducing safety hazards during the operation of the electrical device.

[0042] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 This is a schematic diagram of an electrical device in related technologies;

[0045] Figure 2 This is a schematic diagram of a battery device in related technologies;

[0046] Figure 3 A schematic diagram of the structure of a battery endplate provided in some embodiments of this application from one viewpoint;

[0047] Figure 4 for Figure 3 Enlarged view of the A-structure in the middle;

[0048] Figure 5 A schematic diagram of the battery end plate provided in some embodiments of this application from another perspective;

[0049] Figure 6 This is a schematic diagram of the structure of the first limiting member provided in some embodiments of this application;

[0050] Figure 7 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application.

[0051] Figure label:

[0052] Battery unit 1000, power supply unit 2000.

[0053] Battery housing 100, first section 110, second section 120, individual battery cell 200, battery end plate 300, strapping 400, pressure strip 500.

[0054] End plate body 310, mounting part 311, second limiting member 312, limiting step 313, first section 3131, second section 3132, connecting section 3133, extrusion cavity 314, mounting hole 315, foolproof mark 316, lifting hole 317, positioning hole 318.

[0055] First limiting component 320, insert rod 321, spring arm 322, fixing part 3221, limiting plate 323. Detailed Implementation

[0056] 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 described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0058] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0061] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0062] In this application, "multiple" means two or more (including two).

[0063] In this application, a battery refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery may include a battery housing for encapsulating one or more battery cells or multiple battery modules. The battery housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0064] Battery cells may include lithium-ion rechargeable batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0065] Currently, judging from market trends, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand for them is also constantly increasing.

[0066] In some electrical devices, battery devices are used for power supply. These devices include a battery housing and battery end plates, individual battery cells, and straps housed within the housing. The straps are fitted around the battery end plates and individual battery cells to secure multiple cells. Consequently, the surface of the battery end plates typically has limiting protrusions that restrain the straps, preventing them from detaching from the end plates and individual cells and improving the securing effect. However, existing battery end plates and limiting protrusions are generally integrally molded, resulting in complex manufacturing processes and high costs.

[0067] Furthermore, in order to smoothly fit the straps onto the battery end plate and the outer periphery of the battery cells, the operator needs to use equipment to press multiple battery cells together so that the limiting protrusions avoid the straps. However, due to the large size of the battery cells, their large expansion force, and the small installation space, there is no gap between adjacent battery cells, meaning that the compressibility of multiple battery cells is small. This makes it easy to damage the battery cells, thereby increasing the difficulty and risk of strap installation.

[0068] Based on this, this application proposes a battery device including: a battery end plate, the battery end plate including: an end plate body, the end plate body having a mounting portion that cooperates with the strap of the battery device; a first limiting member, the first limiting member being detachably disposed on the end plate body, the first limiting member being located on one side of the mounting portion, and at least a portion of the first limiting member protruding from the outer surface of the end plate body for limiting the strap disposed on the mounting portion.

[0069] In the technical solution of this application embodiment, by setting a first limiting member that can be detachably connected to the end plate body, the first limiting member can be connected to the end plate body after the strap and the mounting part are engaged. Compared with the solution where the first limiting member and the end plate body are integrally formed, it is not necessary to press multiple battery cells to make the first limiting member avoid the strap. The strap can be smoothly placed on the outer periphery of the battery end plate and the battery cells. This can prevent the battery cells from being damaged due to compression during the installation of the strap, making the installation of the strap easier and reducing the risk of damage to the battery cells.

[0070] The battery device 1000 disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices 2000 such as vehicles, ships or aircraft. The power system of the electrical device 2000 can be composed of the battery device 1000 disclosed in this application, so as to improve the reliability of the electrical device 2000.

[0071] For example, the electrical device 2000 disclosed in this application embodiment may be, but is not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles may be fuel vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0072] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The battery device 1000 can be used to power the vehicle, and the battery device 1000 can be disposed at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to power the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, the controller being used to control the battery device 1000 to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs.

[0073] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the battery structure provided in some embodiments of this application.

[0074] The battery device 1000 includes a battery housing 100 and a battery cell 200. The battery housing 100 includes a first part 110 and a second part 120, and the battery cell 200 is accommodated between the first part 110 and the second part 120.

[0075] A battery cell 200 refers to the smallest unit that makes up a battery. For example, a battery cell 200 may include a casing, an electrode assembly, and an electrolyte. The casing is used to house the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell 200 mainly relies on the movement of metal ions between the positive and negative electrode plates to function. The battery device 1000 may contain multiple battery cells 200, which can be connected in series, parallel, or in a mixed configuration via electrical connectors.

[0076] Below, please refer to the appendix. Figures 3-7The battery device 1000 according to an embodiment of this application includes: a battery cell 200, a battery end plate 300, and a strap 400. The strap is used to fasten the battery end plate 300 and the battery cell 200. The battery end plate 300 includes: an end plate body 310, which has a mounting portion 311 that cooperates with the strap 400 of the battery device 1000; and a first limiting member 320, which is detachably provided on the end plate body 310. The first limiting member 320 is located on one side of the mounting portion 311, and at least a portion of the first limiting member 320 protrudes from the outer surface of the end plate body 310 to limit the strap 400 provided on the mounting portion 311.

[0077] Typically, the battery device 1000 may include a battery housing 100, which may include a first part 110 and a second part 120. The second part 120 may be disposed above the first part 110, and the battery end plate 300, battery cell 200 and strap 400 may be disposed between the first part 110 and the second part 120.

[0078] The number of battery end plates 300 can be two, and the two battery end plates 300 can be in one direction (e.g., Figure 7 The battery cells 200 are arranged opposite each other in the aforementioned direction (as shown in the front-back direction). There can be multiple battery cells 200, which can be positioned between two battery end plates 300, and can be arranged along the aforementioned direction (e.g., front-back direction). Figure 7 The batteries are stacked together in the front-to-back direction shown. The strap 400 can be fitted around the battery end plate 300 and the battery cell 200, which can improve the fixing effect of multiple battery cells 200 and facilitate the installation of multiple battery cells 200 inside the battery box 100.

[0079] The battery end plate 300 may include an end plate body 310 and a first limiting member 320. The end plate body 310 may have a mounting portion 311, and the strap 400 of the battery device 1000 may cooperate with the mounting portion 311. For example, the strap 400 can be attached to the surface of the end plate body 310 through the mounting portion 311, which is beneficial for the installation of the strap 400. The mounting portion 311 can be along the length direction of the end plate body 310 (e.g., ...). Figure 3 Extending in the left and right directions (as shown) can increase the contact area between the strap 400 and the end plate body 310, thereby improving the reliability and stability of the strap 400 after installation.

[0080] It is understandable that the surface of the end plate body 310 may have features along the length direction (e.g., Figure 3 The groove extends in the left-right direction (as shown) to form the mounting portion 311, and the groove is in the height direction of the end plate body 310 (e.g., Figure 3The dimensions in the vertical direction shown can be approximately the same as the width of the strap 400, so that at least a portion of the strap 400 can be inserted into the groove. This prevents the strap 400 from detaching from the end plate body 310 after installation, thereby improving the reliability and stability of the strap 400 after installation.

[0081] It should be added that the battery end plate 300 may have two mounting portions 311, and the two mounting portions 311 may be along the height direction of the end plate body 310 (e.g., Figure 3 The straps are arranged at intervals in the vertical direction shown, and there can be two straps 400. The two straps 400 can cooperate with the two mounting parts 311 respectively, so that the two straps 400 can be respectively fitted on the outer periphery of the battery end plate 300 and the battery cell 200, which can improve the fixing effect of multiple battery cells 200.

[0082] The detachable connection between the first limiting member 320 and the end plate body 310 simplifies the processing technology of the battery end plate 300 and reduces its processing cost. At least a portion of the first limiting member 320 can protrude from the outer surface of the end plate body 310 to be located on one side of the battery end plate 300 (e.g., Figure 3 Taking the mounting portion 311 (shown on the upper side) as an example, the first limiting member 320 can be located on one side of the mounting portion 311 (e.g., the upper side). Figure 3 (as shown on the upper side), and located on the other side of the battery end plate 300 (such as the upper side), and on the other side of the battery end plate 300 (as shown on the upper side). Figure 3 Taking the mounting portion 311 (shown on the lower side) as an example, the first limiting member 320 can be located on the other side of the mounting portion 311 (e.g., the lower side). Figure 3 (as shown on the lower side).

[0083] This allows the first limiting member 320 to contact the strap 400, thereby limiting the strap 400 and preventing it from detaching from the end plate body 310 after installation. This improves the reliability and stability of the strap 400 after installation. Furthermore, if the first limiting member 320 is damaged, the entire battery end plate 300 can be maintained by replacing the damaged first limiting member 320, reducing maintenance costs and facilitating maintenance.

[0084] The first limiting member 320 can be connected to the end plate body 310 after the strap 400 and the mounting part 311 are engaged. This allows the first limiting member 320 to avoid the strap 400 during the installation process. As a result, the strap 400 can be smoothly placed on the outer periphery of the battery end plate 300 and the battery cell 200 without pressing multiple battery cells 200. This can prevent the battery cell 200 from being damaged by compression during the installation process of the strap 400, making the installation of the strap 400 easier and reducing the safety hazards of the installation of the strap 400.

[0085] In the technical solution of this application embodiment, by providing a first limiting member 320 that can be detachably connected to the end plate body 310, the first limiting member 320 can be connected to the end plate body 310 after the strap 400 and the mounting part 311 are engaged. Compared with the solution where the first limiting member 320 and the end plate body 310 are integrally formed, it is not necessary to press multiple battery cells 200 to make the first limiting member 320 avoid the strap 400. The strap 400 can be smoothly fitted onto the outer periphery of the battery end plate 300 and the battery cells 200. This can prevent the battery cells 200 from being damaged due to compression during the installation of the strap 400, making the installation of the strap 400 easier and reducing the risk of damage to the battery cells 200.

[0086] like Figure 3 As shown, according to some embodiments of this application, the first limiting member 320 is engaged with the end plate body 310.

[0087] The first limiting member 320 may have a buckle, and the end plate body 310 may have a slot. Alternatively, the first limiting member 320 may have a slot, and the end plate body 310 may have a buckle. The buckle can engage with the slot for easy assembly and disassembly. Of course, the first limiting member 320 may be fastened to the end plate body 310 by fasteners, which may be screws or bolts. This can improve the connection effect between the first limiting member 320 and the end plate body 310, and improve the reliability and stability of fixing the first limiting member 320.

[0088] Therefore, the first limiting member 320 and the end plate body 310 are engaged to ensure the connection between the first limiting member 320 and the end plate body 310, and to ensure the fixing effect of the first limiting member 320, thereby ensuring the limiting effect of the strap 400, and making it easy to disassemble and maintain.

[0089] like Figure 3 , Figure 4 and Figure 6 As shown, according to some embodiments of this application, the first limiting member 320 includes: a rod 321; a deformable spring arm 322, the spring arm 322 being disposed at one end of the rod 321, the free end of the spring arm 322 being provided with a fixing part 3221; and a limiting plate 323, the limiting plate 323 being disposed at the other end of the rod 321. The end plate body 310 has an insertion hole, the rod 321 and the spring arm 322 are adapted to be inserted into the insertion hole, the fixing part 3221 of the spring arm 322 is adapted to cooperate with the end plate body 310, and the limiting plate 323 is limited to one side of the end plate body 310.

[0090] The first limiting member 320 may include a rod 321, a limiting plate 323, and a spring arm 322 capable of elastic deformation. The spring arm 322 may be disposed at one end of the rod 321 (e.g., Figure 6The limiting plate 323 can be set at the other end of the insertion rod 321 (as shown at the rear end). Figure 6 The front end shown), the spring arm 322 may have a fixed end (such as the front end shown), Figure 6 The back end (as shown) and the free end (as shown) Figure 6 As shown in the front end), the fixed end of the spring arm 322 can be connected to the insertion rod 321, and the free end of the spring arm 322 can be arranged at intervals with the insertion rod 321, that is, in the extending direction of the insertion rod 321 (e.g., the front end is shown in the front end), the fixed end of the spring arm 322 can be connected to the insertion rod 321, and the free end of the spring arm 322 can be arranged at Figure 6 As shown in the direction from back to front, the spring arm 322 can extend away from the insert rod 321, which is conducive to the elastic deformation of the spring arm 322.

[0091] The end plate body 310 may have a socket (not shown in the figure), into which the insertion rod 321 and the spring arm 322 can be inserted, which facilitates the fixing of the limiting member. The limiting plate 323 can limit the end plate body 310 to one side (e.g., Figure 3 As shown in the front side), the limiting plate 323 can contact one side surface of the end plate body 310. The spring arm 322 can elastically deform when inserted into the insertion hole, which facilitates the spring arm 322 passing through the insertion hole and prevents the spring arm 322 from breaking due to insertion into the insertion hole. The free end of the spring arm 322 can be provided with a fixing part 3221. The fixing part 3221 of the spring arm 322 can cooperate with the end plate body 310, that is, the spring arm 322 can return to its initial shape when passing through the insertion hole, so that the fixing part 3221 of the spring arm 322 and the other side of the end plate body 310 (such as the front side) can contact one side surface of the end plate body 310. Figure 3 (The rear side shown) surface contact.

[0092] The limiting plate 323 can apply force to the end plate body 310 through the fixing part 3221, and the fixing part 3221 can apply force to the end plate body 310 through the limiting plate 323. That is, the limiting plate 323 and the fixing part 3221 cooperate to clamp the entire first limiting member 320 on the end plate body 310, which can improve the connection effect between the first limiting member 320 and the end plate body 310, improve the fixing effect of the first limiting member 320, and improve the limiting effect of the strap 400. Furthermore, when the fixing part 3221 of the spring arm 322 cooperates with the end plate body 310, the free end of the spring arm 322 is driven to move so that the entire spring arm 322 undergoes elastic deformation again, which is conducive to the spring arm 322 passing through the insertion hole to separate the first limiting member 320 from the end plate body 310, making it easy to disassemble and maintain.

[0093] Therefore, by providing a first limiting member 320 including a plug rod 321, the first limiting member 320 can be inserted into the end plate body 310 via the plug rod 321, which facilitates the fixing of the limiting member. Furthermore, by providing spring arms 322 and limiting plates 323 at both ends of the plug rod 321, the fixing parts 3221 of the limiting plates 323 and spring arms 322 can cooperate to clamp the entire first limiting member 320 onto the end plate body 310, thereby improving the connection effect between the first limiting member 320 and the end plate body 310, improving the fixing effect of the first limiting member 320, and improving the limiting effect of the strap 400.

[0094] like Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the fixing part 3221 is adapted to extend out of the insertion hole, and the fixing part 3221 abuts against the side of the end plate body 310 opposite to the limiting plate 323.

[0095] The fixing part 3221 can extend out of the insertion hole, that is, the spring arm 322 can pass through the insertion hole so that the fixing part 3221 of the spring arm 322 can cooperate with the end plate body 310, so that the fixing part 3221 can be aligned with the side of the end plate body 310 opposite to the limiting plate 323 (e.g., Figure 3 The rear surface (as shown) abuts against the end plate body 310, and the limiting plate 323 can be limited to one side of the end plate body 310, that is, the limiting plate 323 can be engaged with one side of the end plate body 310 (e.g., the rear side). Figure 3 The front side surface (as shown) abuts against each other.

[0096] Thus, the limiting plate 323 can apply force to the end plate body 310 through the fixing part 3221, and the fixing part 3221 can apply force to the end plate body 310 through the limiting plate 323. That is, the limiting plate 323 and the fixing part 3221 cooperate to clamp the entire first limiting member 320 on the end plate body 310, which can improve the connection effect between the first limiting member 320 and the end plate body 310, improve the fixing effect of the first limiting member 320, and improve the limiting effect of the strap 400.

[0097] Therefore, by extending the fixing part 3221 out of the insertion hole to abut against the end plate body 310, the fixing parts 3221 of the limiting plate 323 and the spring arm 322 can cooperate to clamp the entire first limiting member 320 on the end plate body 310, thereby improving the connection effect between the first limiting member 320 and the end plate body 310, improving the fixing effect of the first limiting member 320, and improving the limiting effect of the strap 400.

[0098] like Figure 6 and Figure 7As shown, in some embodiments, the thickness of the strap 400 is T2, and the thickness of the limiting plate 323 is T1, wherein T1 ≥ T2.

[0099] The thickness of the strap 400 can be T2 (not shown in the figure), and the thickness of the limiting plate 323 can be T1. If the thickness of the limiting plate 323 is too small and the thickness of the strap 400 is too large, the strap 400 is prone to detach from the mounting part 311 when subjected to force, which affects the limiting effect of the strap 400. Therefore, the thickness of the limiting plate 323 can be limited to a range greater than or equal to the thickness of the strap 400, i.e., T1≥T2. This can ensure that the strap 400 and the limiting plate 323 are in full contact, improve the limiting effect of the strap 400, and prevent the strap 400 from detaching from the mounting part 311 due to force.

[0100] Therefore, by limiting the thickness of the limiting plate 323 to a range greater than or equal to the thickness of the strap 400, it is possible to ensure that the strap 400 and the limiting plate 323 are in full contact, thereby improving the limiting effect on the strap 400 and preventing the strap 400 from detaching from the mounting part 311 due to force.

[0101] like Figure 5 and Figure 6 As shown, in some embodiments, the thickness of the end plate body 310 is T3, and the distance between the fixing part 3221 of the spring arm 322 and the end plate body 310 is L, wherein L≥T3.

[0102] The thickness of the end plate body 310 can be T3, and the distance between the fixing part 3221 of the spring arm 322 and the end plate body 310 can be L. If the distance between the fixing part 3221 of the spring arm 322 and the end plate body 310 is too small, and the thickness of the end plate body 310 is too large, the spring arm 322 will have difficulty passing through the insertion hole, and the fixing part 3221 of the spring arm 322 will have difficulty extending out of the insertion hole to abut against the end plate body 310, which will affect the connection effect between the first limiting member 320 and the end plate body 310. Thus, the distance between the fixing part 3221 of the spring arm 322 and the end plate body 310 can be limited to a range greater than or equal to the thickness of the end plate body 310.

[0103] That is, L≥T3, which can ensure that the spring arm 322 passes through the insertion hole, so that the fixing part 3221 of the spring arm 322 extends out of the insertion hole to abut against the end plate body 310. The limiting plate 323 and the fixing part 3221 of the spring arm 322 can cooperate to clamp the entire first limiting member 320 on the end plate body 310. This can improve the connection effect between the first limiting member 320 and the end plate body 310, improve the fixing effect of the first limiting member 320, and improve the limiting effect of the strap 400.

[0104] Therefore, by limiting the distance between the fixing part 3221 of the spring arm 322 and the end plate body 310 to a range greater than or equal to the thickness of the end plate body 310, the fixing part 3221 of the spring arm 322 can extend out of the insertion hole to abut against the end plate body 310, and the limiting plate 323 and the fixing part 3221 of the spring arm 322 can cooperate to clamp the entire first limiting member 320 on the end plate body 310, thereby improving the connection effect between the first limiting member 320 and the end plate body 310, improving the fixing effect of the first limiting member 320, and improving the limiting effect of the strap 400.

[0105] like Figure 6 As shown, in some embodiments, the spring arm 322 includes a plurality of spring arms 322, which are connected to one end of the insertion rod 321 and arranged at intervals along the circumference of the insertion rod 321.

[0106] The spring arm 322 may include multiple spring arms 322, and the fixed ends of the multiple spring arms 322 (such as...) Figure 6 The rear end shown can be connected to one end of the plug 321 (such as...). Figure 6 The rear end shown is connected, and multiple spring arms 322 can be arranged at intervals along the circumference of the insertion rod 321, which can disperse the force between the first limiting member 320 and the end plate body 310, and make the first limiting member 320 more evenly stressed.

[0107] This improves the reliability and stability of fixing the first limiting member 320, prevents the first limiting member 320 from tilting during the limiting of the strap 400, improves the limiting effect of the strap 400, increases the structural strength of the first limiting member 320, and ensures that the first limiting member 320 can still be used normally after a single elastic arm 322 breaks, thus increasing the service life of the first limiting member 320.

[0108] Therefore, by setting multiple spring arms 322 on the insertion rod 321 and arranging the multiple spring arms 322 at intervals along the circumference of the insertion rod 321, the force on the first limiting member 320 can be more evenly distributed, which can improve the reliability and stability of fixing the first limiting member 320, improve the limiting effect on the strap 400, improve the structural strength of the first limiting member 320, and improve the service life of the first limiting member 320.

[0109] like Figure 3 and Figure 4 As shown, according to some embodiments of this application, the end plate body 310 is provided with a second limiting member 312, and the strap 400 is limited between the second limiting member 312 and the first limiting member 320.

[0110] A second limiting member 312 may be provided on the end plate body 310. The second limiting member 312 may be located on the side of the mounting part 311 opposite to the first limiting member 320 (e.g., Figure 4 (as shown on the lower side), so that the second limiting member 312 can contact the strap 400, thereby limiting the strap 400. The first limiting member 320 and the second limiting member 312 can cooperate to limit the strap 400 on opposite sides (e.g., the lower side), allowing the second limiting member 312 to contact the strap 400, thus limiting the strap 400. Figure 7 The upper and lower sides (as shown) limit the strap 400, which can limit the strap 400 between the first limiting member 320 and the second limiting member 312, thereby improving the limiting effect of the strap 400, preventing the strap 400 from detaching from the mounting part 311 of the end plate body 310 after installation, and improving the reliability and stability of the strap 400 after installation.

[0111] Therefore, by providing the second limiting member 312, the second limiting member 312 can cooperate with the first limiting member 320 to provide support on opposite sides of the strap 400 (e.g., ...). Figure 7 The upper and lower sides (as shown) limit the strap 400, which can improve the limiting effect of the strap 400, prevent the strap 400 from separating from the mounting part 311 of the end plate body 310 after installation, and improve the reliability and stability of the strap 400 after installation.

[0112] like Figure 3 and Figure 4 As shown, in some embodiments, the end plate body 310 has a limiting step 313, the limiting step 313 includes a first segment 3131, a connecting segment 3133 and a second segment 3132. The first segment 3131 is closer to one side edge of the end plate body 310 in the height direction relative to the second segment 3132 and has a smaller cross-sectional area than the second segment 3132. The connecting segment 3133 connects the first segment 3131 and the second segment 3132 and forms a second limiting member 312.

[0113] The end plate body 310 may have a limiting step 313, which can contact the strap 400 during installation, and the limiting step 313 and the first limiting member 320 may be located on opposite sides of the strap 400 (e.g., Figure 3 The upper and lower sides (as shown) can improve the limiting effect on the strap 400 and prevent the strap 400 from detaching from the mounting part 311 of the end plate body 310 after installation.

[0114] The limiting step 313 may include two, and the two limiting steps 313 may be located in the height direction of the end plate body 310 respectively (e.g., Figure 3 The opposite sides (as shown in the up and down direction) Figure 3(As shown on the left and right sides), each limiting step 313 may include a first segment 3131, a connecting segment 3133 and a second segment 3132. The connecting segment 3133 may be located between the first segment 3131 and the second segment 3132, and the connecting segment 3133 may be connected to the first segment 3131 and the second segment 3132 respectively to form a second limiting member 312. The second limiting member 312 plays a limiting role for the strap 400 in the entire limiting step 313.

[0115] In the height direction of the end plate body 310 (e.g.) Figure 3 On the vertical direction shown, located on one side of the end plate body 310 (e.g., in the vertical direction shown), Figure 3 Taking the mounting portion 311 (shown on the upper side) and the limiting step 313 located on one side of the end plate body 310 as examples, the first segment 3131 can be located on the side of the end plate body 310 closer to the second segment 3132 (e.g., the upper side) of the mounting portion 311 and the limiting step 313 located on one side of the end plate body 310. Figure 3 (as shown above), and the cross-sectional area of ​​the first segment 3131 in the height direction is smaller than the cross-sectional area of ​​the second segment 3132 in the height direction. That is, on a plane perpendicular to the height direction, the projected area of ​​the first segment 3131 on the aforementioned plane is smaller than the projected area of ​​the second segment 3132 on the aforementioned plane, which facilitates the installation of the strap 400, allowing the strap 400 to be installed from one side of the end plate body 310 (e.g., the upper side), and the cross-sectional area of ​​the first segment 3131 in the height direction is smaller than the cross-sectional area of ​​the second segment 3132 on the aforementioned plane. This facilitates the installation of the strap 400, allowing the strap 400 to be installed from one side of the end plate body 310 (e.g., the upper side). Figure 3 The upper side shown is installed to the mounting part 311, and the connecting section 3133 (such as the second limiting member 312) can contact the strap 400 when the strap 400 is installed, so as to limit the strap 400.

[0116] Located on the other side of the end plate body 310 (e.g.) Figure 3 Taking the mounting portion 311 (shown on the lower side) and the limiting step 313 located on the other side of the end plate body 310 as examples, the first segment 3131 is closer to the other side of the end plate body 310 than the second segment 3132 (as shown on the lower side). Figure 3 (as shown below), and the cross-sectional area of ​​the first segment 3131 is smaller than the cross-sectional area of ​​the second segment 3132, that is, in the arrangement direction perpendicular to the first segment 3131 and the second segment 3132 (as shown below), Figure 3 On the plane (shown in the vertical direction), the projected area of ​​the first segment 3131 on the aforementioned plane is smaller than the projected area of ​​the second segment 3132 on the aforementioned plane, which facilitates the installation of the strap 400, allowing the strap 400 to be installed from the other side of the end plate body 310 (e.g., in the vertical direction). Figure 3 The upper side shown is installed to the mounting part 311, and the connecting section 3133 (such as the second limiting member 312) can contact the strap 400 when the strap 400 is installed, so as to limit the strap 400.

[0117] In each limiting step 313, the connecting segment 3133 can serve as a step surface perpendicular to the height direction, and the step surface can be located on the side of the mounting part 311 opposite to the first limiting member 320, so that the connecting segment 3133 (second limiting member 312) can contact the strap 400 during installation, thereby limiting the strap 400. Furthermore, the first limiting member 320 and the connecting segment 3133 can cooperate to limit the strap 400 on opposite sides (e.g., Figure 7 The upper and lower sides (as shown) limit the strap 400, which can improve the limiting effect of the strap 400, prevent the strap 400 from separating from the mounting part 311 of the end plate body 310 after installation, and improve the reliability and stability of the strap 400 after installation.

[0118] It is understood that the connecting segment 3133 can be a protrusion that protrudes along the height direction on the end plate body 310. The first segment 3131 and the second segment 3132 can be connected by the protrusion, and the stepped surface can be located on the side of the mounting part 311 away from the first limiting member 320, so that the connecting segment 3133 (second limiting member 312) can contact the strap 400 when the strap 400 is installed, thereby limiting the strap 400.

[0119] Therefore, by providing a limiting step 313 on the end plate body 310, the cross-sectional area of ​​the limiting step 313 on the side closer to the end plate body 310 in the height direction is smaller than the cross-sectional area of ​​the limiting step 313 on the side farther from the end plate body 310 in the height direction. This facilitates the installation of the strap 400 and makes the cooperation between the strap 400 and the mounting part 311 of the end plate body 310 smoother, thus improving the smoothness of the strap 400 installation. Furthermore, the limiting step 313 can cooperate with the first limiting member 320 to limit the strap 400 on opposite sides, thereby improving the limiting effect of the strap 400 and preventing the strap 400 from detaching from the mounting part 311 of the end plate body 310 after installation. This also improves the reliability and stability of the strap 400 after installation.

[0120] like Figure 3 and Figure 4 As shown, according to some embodiments of this application, the surface of the first segment 3131 at the corner of the end of the end plate body 310 in the length direction is a convex arc surface.

[0121] The first segment 3131 can be located along the length direction of the end body 310 (e.g., ...). Figure 4 The end (as shown in the left and right directions) on the end (e.g.) Figure 4(As shown at the left or right end), and the surface of the first segment 3131 at the corner of the end of the end plate body 310 in the length direction is a convex arc surface, that is, the two adjacent walls of the end plate body 310 can be connected by a rounded transition at the position of the first segment 3131, which can increase the contact area between the strap 400 and the bottom wall of the limiting groove 313, reduce the local force on the strap 400, make the strap 400 more uniformly stressed, improve the service life of the strap 400, improve the constraint effect on the end plate body 310, improve the constraint effect on the battery cell 200, and improve the fixing effect on multiple battery cells 200.

[0122] Therefore, by setting the surface of the first segment 3131 at the corner of the end plate body 310 to be a convex arc surface, the contact area between the strap 400 and the bottom wall of the limiting groove 313 can be increased, the local force on the strap 400 can be reduced, the strap 400 can be subjected to more uniform force, the service life of the strap 400 can be improved, the constraint effect on the end plate body 310 can be improved, the constraint effect on the battery cell 200 can be improved, and the fixing effect on multiple battery cells 200 can be improved.

[0123] According to some embodiments of this application, at least a portion of the surface of the mounting portion 311 is a convex arc surface.

[0124] The entire surface of the mounting part 311 can be a convex arc surface, or a part of the surface of the mounting part 311 (such as the middle part) can be a convex arc surface. On the one hand, it can increase the contact area between the strap 400 and the mounting part 311 and ensure that the strap 400 and the mounting part 311 fit tightly. On the other hand, it can increase the thickness of the middle part of the mounting part 311, improve the structural strength of the mounting part 311, reduce the amount of deformation of the mounting part 311 under stress, and improve the support effect on the strap 400.

[0125] Therefore, by making at least a portion of the surface of the mounting portion 311 a convex arc surface, the contact area between the strap 400 and the mounting portion 311 can be increased, ensuring that the strap 400 and the mounting portion 311 fit tightly together. At the same time, the thickness of the middle part of the mounting portion 311 can be increased, improving the structural strength of the mounting portion 311, reducing the deformation of the mounting portion 311 under stress, and improving the support effect on the strap 400, thereby improving the reliability and stability of the installation of the strap 400.

[0126] like Figure 3 and Figure 5 As shown, according to some embodiments of this application, the end plate body 310 has a plurality of extrusion cavities 314, the end plate body 310 has a length direction and a height direction, each extrusion cavity 314 extends along the length direction of the end plate body 310, and the plurality of extrusion cavities 314 are arranged in the height direction of the end plate body 310.

[0127] The end plate body 310 may have multiple extrusion cavities 314, and the end plate body 310 may have a length direction (e.g., Figure 3 (as shown in the left and right directions) and height direction (as shown in the figure) Figure 3 (As shown in the vertical direction), each extrusion cavity 314 can extend along the length direction of the end plate body 310, and multiple extrusion cavities 314 can be arranged in the height direction of the end plate body 310. That is, the end plate body 310 is extruded by the extrusion die in the length direction, which can reduce the size of the extrusion die and reduce processing costs.

[0128] Therefore, by extruding the end plate body 310 in the length direction, the size of the extrusion die can be reduced, and the processing cost can be lowered.

[0129] like Figure 3 and Figure 5 As shown, in some embodiments, the cross section of the extrusion cavity 314 perpendicular to the length direction of the end plate body 310 is triangular.

[0130] In the extrusion cavity 314, in the length direction perpendicular to the end plate body 310 (e.g.) Figure 3 The cross section in the left and right directions shown can be triangular, that is, the projection of the extrusion cavity 314 in the length direction perpendicular to the end plate body 310 can be triangular. This can improve the stability of the extrusion cavity 314 structure, improve the structural strength of the end plate body 310, make the end plate body 310 more uniformly stressed, prevent the end plate body 310 from breaking under stress, and improve the service life of the end plate body 310.

[0131] Therefore, by setting the extrusion cavity 314 in the end plate body 310 as a triangle, the stability of the extrusion cavity 314 structure can be improved, the structural strength of the end plate body 310 can be improved, the stress on the end plate body 310 can be made more uniform, the end plate body 310 can be prevented from breaking under stress, and the service life of the end plate body 310 can be improved.

[0132] like Figure 5 As shown, according to some embodiments of this application, the end plate body 310 has a height direction, and in the height direction of the end plate body 310, the thickness dimension of the middle part of the end plate body 310 is greater than the thickness dimension of the opposite sides of the end plate body 310 in the height direction.

[0133] The end plate body 310 may have a height direction (e.g. Figure 5 (as shown in the vertical direction), and in the height direction of the end plate body 310, the thickness of the middle part of the end plate body 310 can be greater than that of the opposite sides of the end plate body 310 in the height direction (e.g., in the vertical direction). Figure 5The thickness of the upper and lower sides (as shown) can improve the structural strength of the middle part of the end plate body 310, reduce the deformation of the middle part of the end plate body 310 under stress, so that the end plate body 310 can fully resist the expansion force of the battery cell 200, improve the constraint effect on the battery cell 200, and prevent the end plate body 310 from being damaged and failing due to excessive expansion force of the battery cell 200.

[0134] Therefore, by setting the end plate body 310 with a central thickness greater than the edge thickness, the structural strength of the central part of the end plate body 310 can be improved, the deformation of the central part of the end plate body 310 under stress can be reduced, the end plate body 310 can fully resist the expansion force of the battery cell 200, the constraint effect on the battery cell 200 can be improved, and the end plate body 310 can be prevented from being damaged and failing due to excessive expansion force of the battery cell 200.

[0135] like Figure 5 As shown, in some embodiments, at least a portion of the outer surface of the end plate body 310 is a convex arc surface.

[0136] The entire outer surface of the end plate body 310 can be a convex arc surface, or a part of the outer surface of the end plate body 310 can be a convex arc surface. This can increase the thickness of the middle part of the end plate body, improve the structural strength of the middle part of the end plate body 310, reduce the deformation of the middle part of the end plate body 310 under stress, so that the end plate body 310 can fully resist the expansion force of the battery cell 200, improve the constraint effect on the battery cell 200, and prevent the end plate body 310 from being damaged and failing due to excessive expansion force of the battery cell 200.

[0137] Therefore, by making at least a portion of the surface of the end plate body 310 a convex arc surface, the thickness of the middle part of the end plate body can be increased, the structural strength of the middle part of the end plate body 310 can be improved, the deformation of the middle part of the end plate body 310 under stress can be reduced, so that the end plate body 310 can fully resist the expansion force of the battery cell 200, improve the constraint effect on the battery cell 200, and prevent the end plate body 310 from being damaged and failing due to excessive expansion force of the battery cell 200.

[0138] like Figure 5 As shown, in some embodiments, the thickness of the end plate body 310 is T3, where 0.2mm≤T3≤0.5mm.

[0139] The thickness of the end plate body 310 can be T3. If the thickness of the end plate body 310 is too large, the mass and volume of the end plate body 310 will be too large, and it will occupy too much space. If the thickness of the end plate body 310 is too small, it will be difficult to ensure the structural strength of the end plate body 310, and it will be difficult to effectively constrain the battery cell 200.

[0140] This allows the thickness of the end plate body 310 to be limited to between 0.2mm and 0.5mm. T3 can be any one of 0.2mm, 0.3mm, 0.4mm, or 0.5mm, or any value between two of them. This ensures the structural strength of the end plate body 310, enabling it to fully resist the expansion force of the battery cell 200. It also improves the constraint effect on the battery cell 200 and prevents the end plate body 310 from being damaged or failing due to excessive expansion force from the battery cell 200. At the same time, it reduces the mass and volume of the end plate body 310, thereby reducing the space occupied by the end plate body 310 and saving space.

[0141] Therefore, by limiting the thickness of the end plate body 310 to between 0.2mm and 0.5mm, the structural strength of the end plate body 310 can be guaranteed, enabling the end plate body 310 to fully resist the expansion force of the battery cell 200, thereby improving the constraint effect on the battery cell 200 and preventing the end plate body 310 from being damaged or failing due to excessive expansion force of the battery cell 200. At the same time, the mass and volume of the end plate body 310 can be reduced, thereby reducing the space occupied by the end plate body 310 and saving space.

[0142] like Figure 5 As shown, in some embodiments, the thickness of the end plate body 310 is T3, where 0.2mm≤T3≤0.3mm.

[0143] The thickness of the end plate body 310 can be T3. If the thickness of the end plate body 310 is too large, the mass and volume of the end plate body 310 will be too large, and it will occupy too much space. If the thickness of the end plate body 310 is too small, it will be difficult to ensure the structural strength of the end plate body 310, and it will be difficult to effectively constrain the battery cell 200.

[0144] This allows the thickness of the end plate body 310 to be limited to between 0.2mm and 0.3mm. T3 can be any one of 0.20mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, or 0.30mm, or any value between two of them. This ensures the structural strength of the end plate body 310, enabling it to fully resist the expansion force of the battery cell 200. It also improves the constraint effect on the battery cell 200 and prevents the end plate body 310 from being damaged or failing due to excessive expansion force from the battery cell 200. At the same time, it reduces the mass and volume of the end plate body 310, thereby reducing the space occupied by the end plate body 310 and saving space.

[0145] Therefore, by limiting the thickness of the end plate body 310 to between 0.2mm and 0.3mm, the structural strength of the end plate body 310 can be guaranteed, enabling the end plate body 310 to fully resist the expansion force of the battery cell 200, thereby improving the constraint effect on the battery cell 200 and preventing the end plate body 310 from being damaged or failing due to excessive expansion force of the battery cell 200. At the same time, the mass and volume of the end plate body 310 can be reduced, thereby reducing the space occupied by the end plate body 310 and saving space.

[0146] like Figure 7 As shown, according to some embodiments of this application, the battery cell 200 includes a casing, the casing wall thickness of which is D, satisfying: 0.1mm≤D≤0.5mm.

[0147] The battery cell 200 may include a casing to protect the battery cell 200 and reduce the risk of damage to the battery cell 200. The casing wall thickness can be D. If the casing wall thickness is too small, the casing is easily deformed due to compression during the installation of the strap 400, making the battery cell 200 susceptible to damage due to compression during the installation of the strap 400, thus increasing the risk of damage to the battery cell 200. If the casing wall thickness is too large, it increases the thickness of multiple battery cells 200 stacked together, requiring operators to use equipment to press multiple battery cells 200 together to install the strap 400, which can easily damage the battery cells 200 and increase the difficulty and risk of strap installation.

[0148] This allows the shell wall thickness to be limited to between 0.1mm and 0.5mm, i.e., 0.1mm≤D≤0.5mm, where D can be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, or any range between two of them. This prevents the strap 400 from squeezing multiple battery cells 200 during installation and also prevents multiple battery cells 200 from being damaged due to squeezing. This makes the installation of the strap 400 easier and reduces the risk of damage to the battery cells 200.

[0149] Therefore, by limiting the thickness of the outer casing wall to 0.1mm-0.5mm, the strap 400 can prevent multiple battery cells 200 from being squeezed during installation, and can also prevent multiple battery cells 200 from being damaged due to compression, making the installation of the strap 400 easier and reducing the risk of damage to the battery cells 200.

[0150] The battery device 1000 also includes: a plurality of battery cells 200 arranged between two battery end plates 300; and a strap 400 wrapped around the outer periphery of the battery end plates 300 and the battery cells 200.

[0151] The battery assembly 1000 may also include a strap 400 and multiple battery cells 200, with two battery end plates 300 positioned in one direction (e.g., Figure 7 Arranged relative to each other in the front-back direction (as shown), multiple battery cells 200 can be arranged between two battery end plates 300. The straps 400 can be wrapped around the battery end plates 300 and the outer periphery of the battery cells 200, which can improve the constraint effect on the battery cells 200 and improve the fixing effect on multiple battery cells 200, and prevent the battery cells 200 from shifting or loosening when the battery device 1000 vibrates or is impacted.

[0152] Therefore, by providing battery end plates 300 on opposite sides of multiple battery cells 200, and by providing straps 400 that can be wrapped around the battery end plates 300 and the outer periphery of the battery cells 200, the constraint effect on the battery cells 200 can be improved, and the fixing effect on the multiple battery cells 200 can be improved, thus preventing the battery cells 200 from shifting or loosening when the battery device 1000 vibrates or is impacted.

[0153] like Figure 3 and Figure 7 As shown, according to some embodiments of this application, the end plate body 310 is provided with mounting holes 315 for mounting pressure strips 500; and / or, the end plate body 310 is provided with anti-foolproof markings 316.

[0154] The battery assembly 1000 may further include a pressure strip 500, which can be arranged along the direction of the arrangement of the multiple battery cells 200 (e.g., Figure 7 Extending in the front-to-back direction (as shown), the end plate body 310 can be provided with mounting holes 315. The two ends of the pressure strip 500 can be connected to the two end plate bodies 310 respectively by fasteners, so that the pressure strip 500 can cooperate with the strap 400, which can improve the fixing effect of multiple battery cells 200 and prevent the battery cells 200 from shifting or loosening when the battery device 1000 vibrates or is impacted. The fasteners can be screws or bolts, which have a good fastening effect and are easy to disassemble and assemble. The end plate body 310 can be provided with a foolproof mark 316 (such as positive and negative markings), which is beneficial to the installation of battery cells 200 and can prevent the positive and negative terminals of battery cells 200 from being installed incorrectly.

[0155] Therefore, by providing mounting holes 315 on the end plate body 310, the pressure strip 500 can be installed and fixed, so that the pressure strip 500 can cooperate with the strap 400, which can improve the fixing effect of multiple battery cells 200 and prevent the battery cells 200 from shifting or loosening when the battery device 1000 vibrates or is impacted. By providing a foolproof mark 316 on the end plate body 310, it is beneficial to install the battery cells 200 and can prevent the positive and negative terminals of the battery cells 200 from being installed incorrectly.

[0156] like Figure 3 As shown, according to some embodiments of this application, the end plate body 310 is provided with a hoisting hole 317 and a positioning hole 318.

[0157] The battery end plate 300 and the outer periphery of the battery cell 200 can be fitted with straps 400 to fix multiple battery cells 200. The end plate body 310 can be provided with lifting holes 317, which is conducive to lifting multiple battery cells 200, that is, it is convenient to lift multiple battery cells 200 into the battery box 100 through the lifting holes 317. The end plate body 310 can also be provided with positioning holes 318, which is conducive to positioning the battery cells 200 and positioning multiple battery cells 200 during the assembly process, making it convenient to install multiple battery cells 200 into the battery box 100.

[0158] Therefore, by providing hoisting holes 317 and positioning holes 318 on the end plate body 310, it is convenient to hoist multiple battery cells 200 and to position multiple battery cells 200, thereby facilitating the installation of multiple battery cells 200 into the battery box 100.

[0159] In some embodiments, the strap 400 is a steel strap.

[0160] The strap 400 can be made of steel, which can improve the structural strength of the strap 400, increase the constraint force on the battery end plate 300, and improve the constraint effect on the battery cell 200.

[0161] Therefore, using steel straps as binding straps 400 can improve the structural strength of binding straps 400, increase the constraint force on battery end plate 300, improve the constraint effect on battery cell 200, improve the fixing effect on multiple battery cells 200, and prevent battery cells 200 from shifting or loosening when the battery device 1000 vibrates or is impacted.

[0162] Secondly, this application provides an electrical device 2000, which includes the battery device 1000 in the above embodiments, and the battery device 1000 is used to provide electrical energy. Therefore, by using the above-mentioned battery device 1000, the battery cells 200 can be prevented from being damaged by compression during the installation process of the strap 400, and the safety hazards of the electrical device 2000 in operation can be reduced.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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 therein. 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 application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell, a battery end plate, and a binding strap, wherein the binding strap is used to secure the battery end plate and the battery cell, and the battery end plate includes: An end plate body having a mounting portion that engages with a strap of a battery device; A first limiting member is detachably disposed on the end plate body. The first limiting member is located on one side of the mounting portion, and at least a portion of the first limiting member protrudes from the outer surface of the end plate body to limit the strap disposed on the mounting portion.

2. The battery device according to claim 1, characterized in that, The first limiting member engages with the end plate body.

3. The battery device according to claim 1, characterized in that, The first limiting member includes: Insert rod; A deformable spring arm is provided at one end of the insert rod, and the free end of the spring arm is provided with a fixing part; A limiting plate is provided at the other end of the insertion rod. The end plate body has an insertion hole, the insertion rod and the spring arm are adapted to be inserted into the insertion hole, the fixing part of the spring arm is adapted to cooperate with the end plate body, and the limiting plate is limited to one side of the end plate body.

4. The battery device according to claim 3, characterized in that, The fixing part is adapted to extend out of the insertion hole, and the fixing part abuts against the side of the end plate body opposite to the limiting plate.

5. The battery device according to claim 3, characterized in that, The thickness of the strap is T2, and the thickness of the limiting plate is T1, wherein T1 ≥ T2.

6. The battery device according to claim 3, characterized in that, The spring arms include a plurality of spring arms, which are connected to one end of the insertion rod and arranged at intervals along the circumference of the insertion rod.

7. The battery device according to claim 1, characterized in that, The end plate body is provided with a second limiting member, and the strap is limited between the second limiting member and the first limiting member.

8. The battery device according to claim 7, characterized in that, The end plate body has a limiting step, which includes a first segment, a connecting segment, and a second segment. The first segment is located near the side edge of the end plate body in the height direction relative to the second segment and has a smaller cross-sectional area than the second segment. The connecting segment connects the first segment and the second segment and forms the second limiting member.

9. The battery device according to claim 8, characterized in that, The surface at the corner of the first segment located at the end of the end plate body along its length is a convex arc surface.

10. The battery device according to claim 1, characterized in that, The end plate body has multiple extrusion cavities, the end plate body has a length direction and a height direction, each of the extrusion cavities extends along the length direction of the end plate body, and the multiple extrusion cavities are arranged in the height direction of the end plate body.

11. The battery device according to claim 10, characterized in that, The cross-section of the extrusion cavity, perpendicular to the length direction of the end plate body, is triangular.

12. The battery device according to claim 1, characterized in that, The end plate body has a height direction, and in the height direction of the end plate body, the thickness of the middle part of the end plate body is greater than the thickness of the opposite sides of the end plate body in the height direction.

13. The battery device according to claim 12, characterized in that, At least a portion of the outer surface of the end plate body is a convex arc surface.

14. The battery device according to any one of claims 1-13, characterized in that, The thickness of the end plate body is T3, where 0.2mm≤T3≤0.5mm.

15. The battery device according to claim 14, characterized in that, The thickness of the end plate body is T3, where 0.2mm≤T3≤0.3mm.

16. The battery device according to claim 1, characterized in that, The end plate body is provided with mounting holes for mounting pressure strips; and / or, The end plate body is equipped with a foolproof marking.

17. The battery device according to claim 1, characterized in that, The battery cell includes a casing, and the casing wall thickness is D, which satisfies: 0.1mm≤D≤0.5mm.

18. The battery device according to claim 1, characterized in that, The straps are made of steel.

19. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1-18, the battery device being used to provide electrical energy.

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