Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment. The battery device comprises a battery box body, a plurality of battery monomers and a connecting plate, an accommodating cavity is formed in the battery box body; the battery box body comprises an upper box body; the plurality of single batteries are arranged in the accommodating cavity; the connecting plate is arranged on one side, close to the upper box body, of the battery monomer; the connecting plate is connected with the plurality of single batteries; wherein the connecting plate is fixedly connected with the upper box body. Through the arrangement, the position between the single battery connected with the connecting plate and the upper box body is relatively fixed, so that the probability that the single battery shifts or shakes in the battery box body is reduced, the abnormal sound of the battery device is reduced, and the dominant frequency function of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical equipment. Background Art

[0002] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. The battery device can be a power battery, and the battery device can also be an energy storage battery.

[0003] The battery device may sometimes make unusual noises during use. Utility Model Content

[0004] The main technical problem solved by the present application is to provide a battery device and electrical equipment to reduce abnormal noise of the battery device.

[0005] In order to solve the above technical problems, the first technical solution adopted in this application is: to provide a battery device, including a battery case, multiple battery cells and a connecting plate; the battery case is formed with a accommodating cavity; the battery case includes an upper case; multiple battery cells are arranged in the accommodating cavity; the connecting plate is arranged on the side of the battery cell close to the upper case; the connecting plate is connected to the multiple battery cells; wherein the connecting plate is fixedly connected to the upper case.

[0006] The connecting plate is connected to multiple battery cells, and the position between the battery cells and the connecting plate is relatively fixed; the connecting plate is fixedly connected to the upper box body, and the position between the connecting plate and the upper box body is relatively fixed, thereby making the position between the battery cells connected to the connecting plate and the upper box body relatively fixed, reducing the probability of the battery cells shifting or shaking in the battery box, reducing abnormal noise in the battery device, and improving the function of the main frequency of the battery cells.

[0007] In one embodiment, the upper box body is provided with a first connecting structure, and the connecting plate is provided with a second connecting structure; one of the first connecting structure and the second connecting structure is a card slot, and the other of the first connecting structure and the second connecting structure is a card block, and the first connecting structure is card-engaged and connected with the second connecting structure.

[0008] By setting a snap connection between the first connecting structure and the second connecting structure, the stability of the connection between the first connecting structure and the second connecting structure is maintained, and the position between the battery cell and the upper box body is relatively fixed, which reduces the probability of the battery cell shifting or shaking in the battery box body, which is beneficial to improving the main frequency function of the battery cell and reducing abnormal noise.

[0009] In one embodiment, the upper box body includes a cover body and a first convex block disposed on the surface of the cover body close to the connecting plate; the connecting plate includes a plate body and a second convex block disposed on the surface of the plate body close to the upper box body; the end of the first convex block close to the connecting plate has a card slot, and the second convex block serves as a clamping block, and the clamping block is clamped in the card slot; or, the first convex block serves as a clamping block, the end of the second convex block close to the upper box body has a card slot, and the clamping block is clamped in the card slot.

[0010] By providing that the upper box body includes a cover body and a first convex block disposed on the surface of the cover body close to the connecting plate, the clamping connection with the connecting plate is realized through the first convex block. Compared with directly providing a card slot on the cover body, the upper box body has a relatively high strength, which can play a good protective effect on the battery cell and is beneficial to improving the performance of the battery device. By providing that the connecting plate includes a plate body and a second convex block disposed on the surface of the plate body close to the upper box body, the clamping connection with the upper box body is realized through the second convex block, the connecting plate has a relatively high strength, which is beneficial to reducing the deformation of the connecting plate and is conducive to maintaining the stability of the electrical connection of multiple battery cells through the connecting plate.

[0011] In one embodiment, the upper box body includes a cover body and a first convex block disposed on the surface of the cover body close to the connecting plate, and the first convex block serves as a clamping block; the connecting plate includes a plate body, and the surface of the plate body close to the upper box body has a card slot, and the clamping block is clamped in the card slot.

[0012] By providing that the first convex block is disposed in the card slot of the plate body, the cover body and the plate body can be directly attached, enhancing the connection strength and reliability between the upper box body and the connecting plate; in addition, by providing that the upper box body includes a cover body and a first convex block disposed on the surface of the cover body close to the connecting plate, the clamping connection with the connecting plate is realized through the first convex block, the upper box body has a relatively high strength, which can play a good protective effect on the battery cell and is beneficial to improving the performance of the battery device.

[0013] In one embodiment, a first limiting structure is provided on the side surface of the clamping block, a second limiting structure is provided on the side surface of the card slot, and the first limiting structure cooperates with the second limiting structure.

[0014] By providing a first limiting structure on the side surface of the clamping block and a second limiting structure on the side surface of the card slot, the probability of the clamping block falling off from the card slot is reduced, the stability of the connection between the upper box body and the connecting plate is maintained, which is beneficial to maintaining the relative fixation of the position between the battery cell and the upper box body, reducing abnormal noise, and enhancing the function of the main frequency of the battery cell.

[0015] In one embodiment, the port of the card slot is a reduced-opening structure; the end of the clamping block is a thickened structure and has a tip.

[0016] By setting the port of the card slot to a constricted structure, the constricted structure forms a first limiting structure. By setting the end of the card block to a thickened structure, the thickened structure forms a second limiting structure. The constricted structure of the card slot cooperates with the thickened structure of the card block, reducing the probability of the card block falling off from the card slot, making the connection more firm and reliable, maintaining the stability of the connection between the upper box body and the connecting plate, facilitating the relative fixation of the position between the battery cell and the upper box body, reducing abnormal noise, and enhancing the function of the main frequency of the battery cell. In addition, by setting the end of the card block to have a tip, it is easier for the card block to find the position and start the insertion operation when inserted into the corresponding card slot.

[0017] In one embodiment, the card slot includes a first sub-card slot and a second sub-card slot that communicate with each other. The second sub-card slot is located on the side of the first sub-card slot close to the card block; along the direction pointing to the card block, the cross-sectional area of the first sub-card slot gradually increases; the cross-sectional area of the end of the first sub-card slot close to the second sub-card slot is larger than the cross-sectional area of the second sub-card slot; the card block includes a first sub-card block and a second sub-card block that are connected to each other. The second sub-card block is located on the side of the first sub-card block close to the card slot; along the direction pointing to the card slot, the cross-sectional area of the second sub-card block gradually decreases; the cross-sectional area of the end of the second sub-card block close to the first sub-card block is larger than the cross-sectional area of the first sub-card block.

[0018] By setting the cross-sectional area of the end of the first sub-card slot close to the second sub-card slot to be larger than the cross-sectional area of the second sub-card slot, a constricted structure is formed at the port of the card slot. By setting the cross-sectional area of the end of the second sub-card block close to the first sub-card block to be larger than the cross-sectional area of the first sub-card block, the end of the card block is a thickened structure; by setting the cross-sectional area of the second sub-card block to gradually decrease along the direction pointing to the card slot, the end of the card block has a tip. By making the above settings for the structures of the card slot and the card block, the snap connection between the card block and the card slot is achieved.

[0019] In one embodiment, along the direction pointing to the card block, the cross-sectional area of the card slot first gradually increases and then gradually decreases; the card block includes a first sub-card block and a second sub-card block that are connected to each other. The second sub-card block is located on the side of the first sub-card block close to the card slot; along the direction pointing to the card slot, the cross-sectional area of the second sub-card block first gradually increases and then gradually decreases; the cross-sectional area of the end of the second sub-card block close to the first sub-card block is larger than the cross-sectional area of the first sub-card block.

[0020] By setting the cross-sectional area of the card slot to first gradually increase and then gradually decrease along the direction pointing to the card block, a constricted structure is formed at the port of the card slot. By setting the cross-sectional area of the end of the second sub-card block close to the first sub-card block to be larger than the cross-sectional area of the first sub-card block, the end of the card block is a thickened structure; by setting the cross-sectional area of the second sub-card block to first gradually increase and then gradually decrease along the direction pointing to the card slot, the end of the card block has a tip. By making the above settings for the structures of the card slot and the card block, the snap connection between the card block and the card slot is achieved.

[0021] In one embodiment, the connecting plate further includes a reinforcing piece, which is arranged between the plate body and the second bump; the orthographic projection of the second bump on the reinforcing piece is located within the contour of the reinforcing piece; the end surface of the first bump is attached to the reinforcing piece.

[0022] By arranging a reinforcing piece between the plate body and the second bump, and attaching the end surface of the first bump of the upper box body to the reinforcing piece, while realizing the snap connection between the connecting plate and the upper box body, the connecting plate has relatively high strength, which is beneficial to maintaining the stability and reliability of the connection between the connecting plate and the upper box body.

[0023] In one embodiment, the upper box body is an integrally formed structure; and / or, the connecting plate is an integrally formed structure.

[0024] By setting the upper box body to be an integrally formed structure, and / or the connecting plate to be an integrally formed structure, the connection stability of the snap connection between the upper box body and the connecting plate is maintained, and at the same time, it is convenient for assembly and reduces the assembly complexity.

[0025] In one embodiment, the connecting plate is provided with a plurality of second connecting structures; the upper box body has a plurality of first connecting structures that are arranged in cooperation with the plurality of second connecting structures; the plurality of second connecting structures are arranged in an array; or, the connecting plate includes an edge area, a center area, and an intermediate area, the edge area surrounds the intermediate area, the intermediate area surrounds the center area, and the distribution density of the second connecting structures in the edge area and the center area is greater than the distribution density of the second connecting structures in the intermediate area.

[0026] By arranging a plurality of second connecting structures on the connecting plate, a plurality of first connecting structures on the upper box body, and making the above settings for the distribution of the second connecting structures, the stability and consistency of the connection between the upper box body and the connecting plate at each place are maintained, the relative position between the upper box body and the connecting plate is kept fixed, the relative position between the upper box body and the battery cell is kept fixed, the function of improving the main frequency of the battery cell is enhanced, and abnormal noise is reduced.

[0027] In one embodiment, the second connecting structure straddles two adjacent battery cells.

[0028] By arranging the second connection structure to span across two adjacent battery cells, the relative positions between the two adjacent battery cells and between the battery cells and the upper box body are kept relatively fixed, enabling multiple battery cells to form a more stable overall structure. This reduces the possibility of relative displacement or loosening between the battery cells due to external forces such as vibration and impact during use, thereby improving the overall stability and reliability of the battery device. Additionally, by arranging the second connection structure to span across two adjacent battery cells, when the second connection structure engages with the first connection structure or when the upper box body is subjected to external impact, the force can be more evenly distributed to multiple battery cells, avoiding excessive stress on a single battery cell and thus reducing the risk of damage to the battery cell due to excessive local stress.

[0029] In one embodiment, the battery cell includes a terminal post and a safety valve; the second connection structure is arranged in a staggered manner with respect to the terminal post and the safety valve.

[0030] By arranging the second connection structure in a staggered manner with respect to the terminal post and the safety valve, the interference of the second connection structure on the functions of structural components such as the terminal post and the safety valve is reduced, and while maintaining the snap - fit connection between the connecting plate and the upper box body, the impact on the battery cell is also reduced.

[0031] The second technical solution provided by this application is: to provide an electrical equipment, including an equipment main body and a battery device as described in any one of the above, and the battery device is arranged on the equipment main body. The electrical equipment has at least the same advantages as the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following - described drawings are only some embodiments of this application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of the electrical equipment provided by the embodiment of this application;

[0034] Figure 2 is a schematic structural diagram of the battery device provided by the embodiment of this application;

[0035] Figure 3 is a schematic side - view structural diagram of the upper box body of the battery device and multiple assembled battery cells provided by the embodiment of this application;

[0036] Figure 4 is a schematic cross - sectional structural diagram of the upper box body of the battery device and multiple assembled battery cells provided by the embodiment of this application;

[0037] Figure 5It is a schematic structural diagram of the upper box body and multiple battery cells in the first perspective state provided by an embodiment of the present application;

[0038] Figure 6 It is a schematic structural diagram of the upper box body and multiple battery cells in the second perspective state provided by an embodiment of the present application;

[0039] Figure 7 It is a schematic structural diagram of another connection method between the upper box body and the connecting plate provided by an embodiment of the present application;

[0040] Figure 8 It is a schematic structural diagram of yet another connection method between the upper box body and the connecting plate provided by an embodiment of the present application;

[0041] Figure 9 It is a schematic structural diagram of an embodiment of the clamping block and the clamping groove provided by an embodiment of the present application;

[0042] Figure 10 It is a schematic structural diagram of another embodiment of the clamping block and the clamping groove provided by an embodiment of the present application;

[0043] Figure 11 It is a schematic cross-sectional structural diagram of the connecting plate and the battery cell after assembly provided by an embodiment of the present application;

[0044] Figure 12 It is a schematic structural diagram of the battery cell provided by an embodiment of the present application.

[0045] In the figure: 1. Battery device; 11. Battery box body; 110. Accommodation cavity; 111. Upper box body; 111a. Cover body; 111b. First convex block; 1111. First connection structure; 112. Lower box body; 12. Battery cell; 121. Connection member; 122. Cover plate; 123. Pole column; 124. Safety valve; 125. Electrode assembly; 126. Shell; 13. Connecting plate; 131. Second connection structure; 13a. Plate body; 13b. Second convex block; 132. Reinforcing piece; 14. Clamping block; 14a. First sub-clamping block; 14b. Second sub-clamping block; 141. First limiting structure; 15. Clamping groove; 15a. First sub-clamping groove; 15b. Second sub-clamping groove; 151. Second limiting structure; 2. Equipment main body. Detailed implementation manners

[0046] The following will describe the solutions of the embodiments of the present application in detail with reference to the accompanying drawings of the specification.

[0047] In the following description, specific details such as specific system structures, interfaces, and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the present application.

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0049] The terms "first", "second", and "third" in the present application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include unlisted steps or units, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0050] Referring to "embodiments" herein means that a specific feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] Currently, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. The battery device can be a power battery. A power battery is a power source that provides power for tools. A power battery mostly refers to a storage battery that provides power for means of transportation such as electric vehicles, electric trains, electric bicycles, and golf carts, and for aerospace. Of course, the battery device can also be an energy storage battery. An energy storage battery refers to a storage battery used for storing energy from renewable energy sources such as hydroelectric power plants, thermal power plants, wind power plants, and solar power plants. With the continuous expansion of the application fields of battery devices, the market demand for them is also constantly increasing.

[0052] During the use of the battery device, abnormal noises sometimes occur, affecting the performance of the battery device. This is caused by the shaking and collision of battery cells within the battery box. In the prior art, multiple battery cells are fixedly connected through straps or connection plates, but the fixed multiple battery cells still shake within the battery box.

[0053] To solve the above technical problems, an embodiment of the present application provides a battery device, which includes multiple battery cells, a battery box, and a connection plate; the battery box forms a receiving cavity; the battery box includes an upper box body; multiple battery cells are arranged in the receiving cavity; the connection plate is arranged on the side of the battery cells close to the upper box body; the connection plate is connected to the multiple battery cells; wherein, the connection part is fixedly connected to the upper box body. In this embodiment, by setting the fixed connection between the connection part and the upper box body, and the connection plate is connected to the multiple battery cells, the relative position between the upper box body and the battery cells is kept fixed, reducing the probability of the battery cells shaking within the battery box, reducing the occurrence of abnormal noises in the battery device, and enhancing the function of the main frequency of the battery cells.

[0054] An embodiment of the present application provides an electrical device. Refer to Figure 1 , Figure 1 which is a schematic structural diagram of the electrical device provided by the embodiment of the present application.

[0055] The electrical device may include a device main body 2 and a battery device 1, and the battery device 1 is arranged on the device main body 2. The battery device 1 is used to supply power to the electrical components of the device main body 2 so that the device main body 2 can operate.

[0056] The electrical components can be elements that can consume electricity; for example, the electrical components can be a controller and electronic components, etc. The controller can be a central processing unit (Central Processing Unit, abbreviated as CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0057] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a power planer, etc. For the convenience of description in the following embodiments, the electrical device is taken as an example of a vehicle for illustration.

[0058] In some examples, the electrical device can be a vehicle, the device body 2 can be a vehicle frame, and the battery device 1 is installed on the vehicle frame. The electrical components can be the lights of the vehicle (such as the front lights, rear lights, etc.), a display screen, an instrument panel, a control system (such as a controller), etc. The electrical components are installed on the vehicle body.

[0059] An embodiment of the present application further provides a battery device. Refer to Figures 2 - 6 , Figure 2 which is a schematic structural diagram of the battery device provided by the embodiment of the present application; Figure 3 which is a side view structural diagram of the upper box body of the battery device provided by the embodiment of the present application after being assembled with a plurality of battery cells; Figure 4 which is a cross-sectional structural diagram of the upper box body of the battery device provided by the embodiment of the present application after being assembled with a plurality of battery cells; Figure 5 which is a structural diagram of the upper box body and a plurality of battery cells in a first perspective state provided by the embodiment of the present application; Figure 6 which is a structural diagram of the upper box body and a plurality of battery cells in a second perspective state provided by the embodiment of the present application.

[0060] Refer to Figure 2 , Figure 3 and Figure 4 , the battery device 1 includes a battery box body 11, a plurality of battery cells 12 and a connecting plate 13. The battery box body 11 forms a receiving cavity 110. The battery box body 11 includes an upper box body 111. A plurality of battery cells 12 are received in the receiving cavity 110. The connecting plate 13 is disposed on one side of the battery cells 12 close to the upper box body 111. The connecting plate 13 is connected to the plurality of battery cells 12. Among them, the connecting plate 13 is fixedly connected to the upper box body 111.

[0061] The battery box 11 can protect the battery cells 12 and also facilitate the concentration of multiple battery cells 12 together. In some examples, the battery box 11 may include an upper box body 111 and a lower box body 112. The upper box body 111 covers the lower box body 112, and the upper box body 111 and the lower box body 112 jointly define a receiving cavity 110 for receiving the battery cells 12.

[0062] The shape of the battery box 11 can be specifically set according to needs; for example, the shape of the battery box 11 can be cylindrical, and the corresponding battery device 1 can be called a circular battery; or for another example, the shape of the battery box 11 can be rectangular, and the corresponding battery device 1 can be called a rectangular battery.

[0063] In the battery device 1, the battery cell 12 refers to the smallest unit that makes up the battery device 1. There can be multiple battery cells 12, and multiple battery cells 12 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells 12. Multiple battery cells 12 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by multiple battery cells 12 is received in the battery box 11; of course, it can also be that multiple battery cells 12 are first connected in series, parallel, or in a mixed connection to form a battery module form, and multiple battery modules are then connected in series, parallel, or in a mixed connection to form a whole and are received in the battery box 11.

[0064] Each battery cell 12 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0065] The connection plate 13 is a structural member provided between the battery cell 12 and the upper box body 111; in other words, the connection plate 13 is provided on the side of the battery cell 12 close to the upper box body 111. The connection plate 13 is connected to multiple battery cells 12, and the position between the battery cell 12 and the connection plate 13 is relatively fixed; the connection plate 13 is fixedly connected to the upper box body 111, and the position between the connection plate 13 and the upper box body 111 is relatively fixed. As a result, the position between the battery cell 12 connected to the connection plate 13 and the upper box body 111 is relatively fixed, reducing the probability of the battery cell 12 shifting or shaking in the battery box 11, reducing abnormal noises in the battery device 1, and enhancing the main frequency function of the battery cell 12.

[0066] In one embodiment, the connecting plate 13 may be a CCS (Cell Contact System), which is an electrical connection structural member of the battery cell 12 in the battery device 1. The CCS can electrically connect multiple battery cells 12, and it plays the role of connecting each battery cell 12 in series, in parallel, or in a mixed connection, so that the battery device 1 can output a suitable voltage and current according to the design requirements. Optionally, the CCS may be an integrated product that integrates information acquisition components (for example, one of a wiring harness, a PCB (Printed Circuit Board), an FPC (Flexible Printed Circuit), an FFC (Flexible Flat Cable), etc.), a plastic structural member, an aluminum bus (or a copper bus) and other components into a module, which can realize the functions of connecting the battery cells 12 in series, in parallel or in a mixed connection, temperature sampling of the battery cells 12, voltage sampling of the battery cells 12, and overcurrent fusing.

[0067] In one embodiment, the connection method between the connecting plate 13 and the battery cell 12 includes, but is not limited to, gluing, snap connection, welding, riveting, etc.

[0068] In one embodiment, the connection plate 13 and the upper box body 111 are fixedly connected by adhesive bonding, magnetic connection, riveting, or the like.

[0069] In one embodiment, if Figures 4 - 6 As shown, the upper box body 111 is provided with a first connecting structure 1111, and the connecting plate 13 is provided with a second connecting structure 131; one of the first connecting structure 1111 and the second connecting structure 131 is a card slot 15, and the other of the first connecting structure 1111 and the second connecting structure 131 is a card block 14, and the first connecting structure 1111 is engaged with the second connecting structure 131.

[0070] By setting a snap connection between the first connection structure 1111 and the second connection structure 131, the stability of the connection between the first connection structure 1111 and the second connection structure 131 is maintained, and the position between the battery cell 12 and the upper box body 111 is relatively fixed, which reduces the probability of the battery cell 12 shifting or shaking in the battery box body 11, which is beneficial to improving the main frequency function of the battery cell 12 and reducing abnormal noise. For example, Figures 4 - 6 As shown, the upper box body 111 is provided with a card slot 15, and the connecting plate 13 is provided with a card block 14.

[0071] In one embodiment, the upper box body 111 includes a cover body 111a and a first convex block 111b provided on the surface of the cover body 111a close to the connecting plate 13; the connecting plate 13 includes a plate body 13a and a second convex block 13b provided on the surface of the plate body 13a close to the upper box body 111. The end of the first convex block 111b close to the connecting plate 13 has a clamping groove 15, and the second convex block 13b serves as a clamping block 14, and the clamping block 14 is clamped in the clamping groove 15 (as shown in Figure 5 and Figure 6 ); alternatively, the first convex block 111b serves as a clamping block 14, the end of the second convex block 13b close to the upper box body 111 has a clamping groove 15, and the clamping block 14 is clamped in the clamping groove 15 (as shown in Figure 7 shown, Figure 7 is a schematic structural diagram of another connection method between the upper box body and the connecting plate provided by the embodiment of the present application).

[0072] The first convex block 111b is a structural member protruding from the surface of the cover body 111a; optionally, the surface of the cover body 111a close to the connecting plate 13 is a plane. The second convex block 13b is a structural member protruding from the surface of the plate body 13a; optionally, the surface of the plate body 13a close to the upper box body 111 is a plane. When the end of the first convex block 111b close to the connecting plate 13 has a clamping groove 15 and the second convex block 13b serves as a clamping block 14, the structure and dimensions of the clamping groove 15 of the first convex block 111b are arranged in cooperation with the structure and dimensions of the second convex block 13b, so that the first convex block 111b and the second convex block 13b can be clamped and connected. When the first convex block 111b serves as a clamping block 14 and the end of the second convex block 13b close to the upper box body 111 has a clamping groove 15, the structure and dimensions of the first convex block 111b are arranged in cooperation with the structure and dimensions of the clamping groove 15 on the second convex block 13b, so that the first convex block 111b and the second convex block 13b can be clamped and connected.

[0073] By providing that the upper box body 111 includes a cover body 111a and a first convex block 111b provided on the surface of the cover body 111a close to the connecting plate 13, and realizing the clamping connection with the connecting plate 13 through the first convex block 111b, compared with directly providing a clamping groove 15 on the cover body 111a, the upper box body 111 has higher strength, can play a good protection effect on the battery cell 12, and is beneficial to improving the performance of the battery device 1.

[0074] By providing that the connecting plate 13 includes a plate body 13a and a second convex block 13b provided on the surface of the plate body 13a close to the upper box body 111, and realizing the clamping connection with the upper box body 111 through the second convex block 13b, the connecting plate 13 has higher strength, is beneficial to reducing the deformation of the connecting plate 13, and is beneficial to maintaining the stability of the electrical connection of multiple battery cells 12 through the connecting plate 13.

[0075] In one embodiment, as shown in Figure 8As shown Figure 8 FIG. Figure 8 is a schematic structural diagram of another connection method between the upper box body and the connecting plate provided in the embodiment of the present application. The upper box body 111 includes a cover body 111a and a first convex block 111b provided on the surface of the cover body 111a close to the connecting plate 13. The first convex block 111b serves as a clamping block 14. The connecting plate 13 includes a plate body 13a, and a clamping groove 15 is provided on the surface of the plate body 13a close to the upper box body 111. The clamping block 14 is clamped in the clamping groove 15.

[0076] The first convex block 111b is a structural member protruding from the surface of the cover body 111a. Optionally, the surface of the cover body 111a close to the connecting plate 13 is a plane. The structure and dimensions of the clamping groove 15 on the surface of the plate body 13a close to the upper box body 111 are set in cooperation with the structure and dimensions of the first convex block 111b, so that the first convex block 111b can be clamped and connected with the clamping groove 15 of the plate body 13a.

[0077] By arranging the first convex block 111b in the clamping groove 15 of the plate body 13a, the cover body 111a and the plate body 13a can be directly attached, enhancing the connection strength and reliability between the upper box body 111 and the connecting plate 13. In addition, by arranging the upper box body 111 to include the cover body 111a and the first convex block 111b provided on the surface of the cover body 111a close to the connecting plate 13, the clamping connection with the connecting plate 13 is realized through the first convex block 111b, keeping the upper box body 111 with high strength, which can play a good protective effect on the battery cell 12 and is beneficial to improving the performance of the battery device 1.

[0078] Please refer to Figure 9 and Figure 10 , Figure 9 FIG. Figure 9 is a schematic structural diagram of an embodiment of the clamping block and the clamping groove provided in the embodiment of the present application, Figure 10 FIG. Figure 10 is a schematic structural diagram of another embodiment of the clamping block and the clamping groove provided in the embodiment of the present application.

[0079] In one embodiment, a first limiting structure 141 is provided on the side surface of the clamping block 14, and a second limiting structure 151 is provided on the side surface of the clamping groove 15. The first limiting structure 141 cooperates with the second limiting structure 151.

[0080] By arranging the first limiting structure 141 on the side surface of the clamping block 14 and the second limiting structure 151 on the side surface of the clamping groove 15, the probability of the clamping block 14 falling off from the clamping groove 15 is reduced, the connection stability between the upper box body 111 and the connecting plate 13 is maintained, which is beneficial to keeping the relative fixation of the position between the battery cell 12 and the upper box body 111, reducing abnormal noise, and improving the function of the main frequency of the battery cell 12.

[0081] In one embodiment, first limiting structures 141 are provided on opposite side surfaces of the clamping block 14, and second limiting structures 151 are provided on opposite side surfaces of the clamping groove 15. The clamping connection between the clamping block 14 and the clamping groove 15 is restricted from two opposite directions, and can more effectively resist external forces from different directions, making the connection between the clamping block 14 and the clamping groove 15 more stable.

[0082] In one embodiment, the port of the clamping groove 15 is a reduced-opening structure; the end of the clamping block 14 is a thickened structure and has a tip.

[0083] The port of the clamping groove 15 is a reduced-opening structure, that is, the size of the port of the clamping groove 15 is smaller than the size inside the main body of the clamping groove 15. The end of the clamping block 14 is a thickened structure, that is, the end of the clamping block 14 presents a thickened form, and the cross-sectional area of the end of the clamping block 14 is larger than the cross-sectional area of other parts of the clamping block 14. The end of the clamping block 14 is a thickened structure and has a tip, that is, along the direction in which the clamping block 14 is away from the clamping groove 15, the cross-sectional area of the end of the clamping block 14 gradually increases or gradually increases and then gradually decreases to form a thickened structure; the cross-sectional area of the part of the end of the clamping block 14 close to the clamping groove 15 is smaller than the maximum cross-sectional area of the end of the clamping block 14 to form a tip. Herein, the cross-sectional area refers to the area of the section perpendicular to the direction in which the clamping block 14 points to the clamping groove 15.

[0084] By setting the port of the clamping groove 15 to be a reduced-opening structure, the reduced-opening structure forms the first limiting structure 141. By setting the end of the clamping block 14 to be a thickened structure, the thickened structure forms the second limiting structure 151. The reduced-opening structure of the clamping groove 15 cooperates with the thickened structure of the clamping block 14 to reduce the probability of the clamping block 14 falling out of the clamping groove 15, making the connection more firm and reliable, maintaining the stability of the connection between the upper box body 111 and the connecting plate 13, being beneficial to maintaining the relative fixation of the position between the battery cell 12 and the upper box body 111, reducing abnormal noises, and enhancing the function of the main frequency of the battery cell 12. In addition, by setting the end of the clamping block 14 to have a tip, the clamping block 14 is easier to find the position and start the insertion operation when inserting into the corresponding clamping groove 15.

[0085] In one embodiment, as Figure 9As shown, the card slot 15 includes a first sub-card slot 15a and a second sub-card slot 15b that are interconnected. The second sub-card slot 15b is located on the side of the first sub-card slot 15a closer to the card block 14. Along the direction pointing to the card block 14, the cross-sectional area of the first sub-card slot 15a gradually increases. The cross-sectional area of the end of the first sub-card slot 15a close to the second sub-card slot 15b is larger than the cross-sectional area of the second sub-card slot 15b. The card block 14 includes a first sub-card block 14a and a second sub-card block 14b that are connected to each other. The second sub-card block 14b is located on the side of the first sub-card block 14a closer to the card slot 15. Along the direction pointing to the card slot 15, the cross-sectional area of the second sub-card block 14b gradually decreases. The cross-sectional area of the end of the second sub-card block 14b close to the first sub-card block 14a is larger than the cross-sectional area of the first sub-card block 14a.

[0086] Among them, the cross-sectional area of the end of the first sub-card slot 15a close to the second sub-card slot 15b being larger than the cross-sectional area of the second sub-card slot 15b means that the cross-sectional area of the end of the first sub-card slot 15a close to the second sub-card slot 15b is larger than the cross-sectional area at each part of the second sub-card slot 15b. The cross-sectional area of the end of the second sub-card block 14b close to the first sub-card block 14a being larger than the cross-sectional area of the first sub-card block 14a means that the cross-sectional area of the end of the second sub-card block 14b close to the first sub-card block 14a is larger than the cross-sectional area at each part of the first sub-card block 14a.

[0087] By setting the cross-sectional area of the end of the first sub-card slot 15a close to the second sub-card slot 15b to be larger than the cross-sectional area of the second sub-card slot 15b, a necking structure is formed at the port of the card slot 15. By setting the cross-sectional area of the end of the second sub-card block 14b close to the first sub-card block 14a to be larger than the cross-sectional area of the first sub-card block 14a, the end of the card block 14 is made into a thickened structure. By setting the cross-sectional area of the second sub-card block 14b to gradually decrease along the direction pointing to the card slot 15, the end of the card block 14 has a tip, which facilitates the insertion of the second sub-card block 14b from the second sub-card slot 15b into the first sub-card slot 15a. Through the above settings of the structures of the card slot 15 and the card block 14, the engaging connection between the card block 14 and the card slot 15 is achieved.

[0088] Optionally, the cross-sectional areas of each part of the second sub-card slot 15b are the same along the direction pointing to the card block 14. Exemplarily, the longitudinal cross-sectional shape of the first sub-card slot 15a is an isosceles triangle, and the longitudinal cross-sectional shape of the second sub-card slot 15b is a rectangle (as Figure 9 shown). It should be noted that the longitudinal cross-section refers to the cross-section along the direction from the card block 14 to the card slot 15.

[0089] Optionally, the cross-sectional areas of each part of the first sub-card block 14a are the same along the direction pointing to the card slot 15. Exemplarily, the longitudinal cross-sectional shape of the first sub-card block 14a is a rectangle, and the longitudinal cross-sectional shape of the second sub-card block 14b is an isosceles triangle (asFigure 9 as shown

[0090] In one embodiment, as Figure 10 shown, along the direction pointing to the locking block 14, the cross-sectional area of the slot 15 gradually increases first and then gradually decreases. The locking block 14 includes a first sub-locking block 14a and a second sub-locking block 14b connected to each other, and the second sub-locking block 14b is located on the side of the first sub-locking block 14a close to the slot 15; along the direction pointing to the slot 15, the cross-sectional area of the second sub-locking block 14b gradually increases first and then gradually decreases; the cross-sectional area of the end of the second sub-locking block 14b close to the first sub-locking block 14a is larger than the cross-sectional area of the first sub-locking block 14a.

[0091] Wherein, the cross-sectional area of the end of the second sub-locking block 14b close to the first sub-locking block 14a being larger than the cross-sectional area of the first sub-locking block 14a means that the cross-sectional area of the end of the second sub-locking block 14b close to the first sub-locking block 14a is larger than the cross-sectional area of each part of the first sub-locking block 14a.

[0092] By setting that along the direction pointing to the locking block 14, the cross-sectional area of the slot 15 gradually increases first and then gradually decreases, a reduced opening structure is formed at the port of the slot 15. By setting that the cross-sectional area of the end of the second sub-locking block 14b close to the first sub-locking block 14a is larger than the cross-sectional area of the first sub-locking block 14a, a thickened structure is realized at the end of the locking block 14; by setting that along the direction pointing to the slot 15, the cross-sectional area of the second sub-locking block 14b gradually increases first and then gradually decreases, a pointed end is realized at the end of the locking block 14. By making the above settings for the structures of the slot 15 and the locking block 14, the snap connection between the locking block 14 and the slot 15 is realized.

[0093] Optionally, along the direction pointing to the slot 15, the cross-sectional areas of each part of the first sub-locking block 14a are the same. Exemplarily, the longitudinal cross-sectional shape of the first sub-locking block 14a is a rectangle, and the longitudinal cross-sectional shape of the second sub-locking block 14b is a major arc; the longitudinal cross-sectional shape of the slot 15 is a major arc (as Figure 10 shown). The major arc can be a major arc of a circle or a major arc of an ellipse. Figure 10 Shown is the major arc of an ellipse.

[0094] In one embodiment, the locking block 14 and the slot 15 are in interference fit, so as to reduce the probability of the locking block 14 falling off from the slot 15, maintain the stability of the connection between the upper box body 111 and the connecting plate 13, be beneficial to maintaining the relative fixation of the position between the battery cell 12 and the upper box body 111, reduce abnormal noise, and improve the function of the main frequency of the battery cell 12. It should be noted that when designing the interference fit between the locking block 14 and the slot 15, the first limiting structure 141 is arranged on the side of the locking block 14 and the second limiting structure 151 is arranged on the side of the slot 15 are optional structures and can be selected according to needs.

[0095] In one embodiment, as Figure 6 shown, the connecting plate 13 further includes a reinforcing piece 132, and the reinforcing piece 132 is disposed between the plate body 13a and the second bump 13b; the orthographic projection of the second bump 13b on the reinforcing piece 132 is located within the contour of the reinforcing piece 132; the end surface of the first bump 111b is attached to the reinforcing piece 132.

[0096] The reinforcing piece 132 is a sheet-like structural member. A sheet generally has a flat shape, with two dimensions (length and width) being relatively large in three-dimensional space, while the third dimension (thickness) is relatively small.

[0097] By providing the reinforcing piece 132 between the plate body 13a and the second bump 13b, and attaching the end surface of the first bump 111b of the upper box body 111 to the reinforcing piece 132, while achieving snap connection between the connecting plate 13 and the upper box body 111, the connecting plate 13 has relatively high strength, which is beneficial to maintaining the stability and reliability of the connection between the connecting plate 13 and the upper box body 111.

[0098] In one embodiment, the upper box body 111 is an integrally formed structure; and / or, the connecting plate 13 is an integrally formed structure.

[0099] When the upper box body 111 includes a cover body 111a and a first bump 111b disposed on the surface of the cover body 111a close to the connecting plate 13, the cover body 111a and the first bump 111b are an integrally formed structure. Optionally, by injection molding, the cover body 111a and the first bump 111b are simultaneously formed in the same process step to form the integrally formed upper box body 111.

[0100] When the connecting plate 13 includes a plate body 13a and a second bump 13b disposed on the surface of the plate body 13a close to the upper box body 111, the plate body 13a and the second bump 13b are an integrally formed structure. Optionally, by injection molding, the plate body 13a and the second bump 13b are simultaneously formed in the same process step to form the integrally formed connecting plate 13.

[0101] By setting the upper box body 111 to be an integrally formed structure, and / or the connecting plate 13 to be an integrally formed structure, the connection stability of the snap connection between the upper box body 111 and the connecting plate 13 is maintained, while facilitating assembly and reducing assembly complexity.

[0102] In one embodiment, the upper box body 111 and the connecting plate 13 are made of thermoplastic materials, which are recyclable and have the advantage of low carbon.

[0103] In one embodiment, a plurality of second connection structures 131 are provided on the connection plate 13; the upper box body 111 has a plurality of first connection structures 1111 that are arranged in cooperation with the plurality of second connection structures 131; the plurality of second connection structures 131 are arranged in an array; alternatively, the connection plate 13 includes an edge area, a central area, and an intermediate area. The edge area surrounds the intermediate area, and the intermediate area surrounds the central area. The distribution density of the second connection structures 131 in the edge area and the central area is greater than that in the intermediate area.

[0104] By providing a plurality of second connection structures 131 on the connection plate 13, a plurality of first connection structures 1111 on the upper box body 111, and making the above settings for the distribution of the second connection structures 131, the stability and consistency of the connection between the upper box body 111 and the connection plate 13 are maintained, the relative position between the upper box body 111 and the connection plate 13 is kept fixed, the relative position between the upper box body 111 and the battery cell 12 is kept fixed, the function of increasing the main frequency of the battery cell 12 is achieved, and abnormal noise is reduced.

[0105] In one embodiment, as Figure 6 and Figure 11 shown, where Figure 11 is a schematic cross-sectional structure diagram of the assembly of the connection plate and the battery cell provided by the embodiment of the present application. The second connection structure 131 straddles two adjacent battery cells 12.

[0106] The second connection structure 131 straddling two adjacent battery cells 12 means that the second connection structure 131 includes a first part and a second part. The first part covers a part of the surface of one battery cell 12, and the second part covers a part of the surface of another battery cell 12. Optionally, the second connection structure 131 straddles two adjacent battery cells 12 arranged along the thickness direction of the battery cell 12. Optionally, the battery cell 12 is flat.

[0107] By setting the second connection structure 131 to straddle two adjacent battery cells 12, the relative position between the two adjacent battery cells 12 and the relative position between the battery cell 12 and the upper box body 111 are maintained, so that the plurality of battery cells 12 form a more stable overall structure, reducing the possibility of relative displacement or loosening between the battery cells 12 due to external forces such as vibration and impact during use, and improving the overall stability and reliability of the battery device 1. In addition, by setting the second connection structure 131 to straddle two adjacent battery cells 12, when the force generated by the engagement of the second connection structure 131 and the first connection structure 1111 or when the upper box body 111 is impacted by an external force, the force can be more evenly distributed to the plurality of battery cells 12, avoiding excessive stress on a single battery cell 12, thereby reducing the risk of damage to the battery cell 12 due to excessive local stress.

[0108] Please refer to Figure 12 , Figure 12 which is a schematic structural diagram of a battery cell provided by an embodiment of the present application.

[0109] The battery cell 12 can be a secondary battery, which refers to a battery cell 12 that can be activated by charging after discharging to continue use. The battery cell 12 can include, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0110] The battery cell 12 can include a housing 126, an electrode assembly 125, and a cover plate 122. The housing 126 has a communicating cavity and an installation opening. The number of electrode assemblies 125 can be one or more; the electrode assembly 125 is installed in the cavity of the housing 126. The cover plate 122 is connected to the housing 126 and covers the installation opening. The housing 126 is filled with an electrolyte, such as an electrolytic solution.

[0111] The electrode assembly 125 can include an anode plate and a cathode plate, and a separator disposed between the anode plate and the cathode plate. During the charge and discharge process of the battery cell 12, active ions (such as lithium ions) are embedded and extracted back and forth between the anode plate and the cathode plate. The separator can play a role in preventing the anode plate from short-circuiting with the cathode plate to a certain extent, and at the same time allowing active ions to pass through.

[0112] The battery cell 12 can further include a safety valve 124 (which can also be called a pressure relief valve), two pole posts 123, and two connection members 121. The safety valve 124 can be disposed on the cover plate 122, for example, the safety valve 124 is fixed on the cover plate 122, and the safety valve 124 is used to actuate to discharge the internal electrolytic solution when the internal pressure or temperature of the battery cell 12 reaches a threshold value to reduce the internal pressure or temperature of the battery cell 12. For example, the safety valve 124 can be a temperature-sensitive valve, a pressure-sensitive valve, etc. The two pole posts 123 can be disposed on the cover plate 122. The pole post 123 can be an electrode terminal. The two pole posts 123 are respectively a positive electrode terminal and a negative electrode terminal, and one pole post 123 is correspondingly connected to one connection member 121. The connection member 121 is located between the cover plate 122 and the electrode assembly 125 and is used to electrically connect the electrode assembly 125 and the pole post 123. The housing 126 is a hollow structure, and the material of the housing 126 can be metal or plastic; for example, the material of the housing 126 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0113] The terminal post 123 may refer to a conductive component outside the battery cell 12, which is used to connect to the positive and negative electrodes of the internal electrode assembly 125 of the battery cell 12 and to provide an interface for current to enter and exit outside the battery cell 12. The terminal post 123 may be a metal sheet or a metal rod, and the material may include but is not limited to copper, aluminum, or other metals with good electrical conductivity. Among them, the cross-section of the terminal post 123 may include but is not limited to a rectangle, a circle, an ellipse, etc.

[0114] In one embodiment, referring to Figure 6 and Figure 12 , the second connection structure 131 is arranged offset from the terminal post 123 and the safety valve 124, reducing the interference of the second connection structure 131 on the functions of structural components such as the terminal post 123 and the safety valve 124, and reducing the impact on the battery cell 12 while maintaining the snap connection between the connection plate 13 and the upper box body 111.

[0115] In one embodiment, referring to Figure 6 , the connection plate 13 is provided with through holes (not labeled in the figure) corresponding to the terminal posts 123 of each battery cell 12, and the orthographic projection of the through holes on the battery cell 12 covers the terminal posts 123.

[0116] By providing through holes in the connection plate 13 corresponding to the terminal posts 123 of each battery cell 12, the terminal posts 123 can be directly connected to the connection points on the connection plate 13 through the through holes, reducing the intermediate connection links, reducing the resistance, and reducing the power loss.

[0117] The above are only the embodiments of the present application, and do not limit the patent protection scope of the present application. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery box is formed with a receiving cavity; the battery box comprises an upper box; A plurality of battery cells are arranged in the accommodation cavity; A connecting plate is provided on a side of the battery monomer close to the upper box body; the connecting plate is connected to a plurality of the battery monomers; Among them, the connecting plate is fixedly connected to the upper box body; the upper box body is provided with a first connecting structure, and the connecting plate is provided with a second connecting structure; one of the first connecting structure and the second connecting structure is a card slot, and the other of the first connecting structure and the second connecting structure is a card block, and the first connecting structure is card-engaged with the second connecting structure.

2. The battery device according to claim 1, characterized in that: The upper box body comprises a cover body and a first protrusion disposed on a surface of the cover body close to the connecting plate; the connecting plate comprises a plate body and a second protrusion disposed on a surface of the plate body close to the upper box body; The first protrusion has the slot at the end close to the connecting plate, and the second protrusion serves as the block, which is locked in the slot; or, The first protrusion serves as the clamping block, and the end of the second protrusion close to the upper box body has the clamping groove, and the clamping block is clamped in the clamping groove.

3. The battery device according to claim 1, characterized in that: The upper box body comprises a cover body and a first protrusion provided on a surface of the cover body close to the connecting plate, wherein the first protrusion serves as the clamping block; The connecting plate comprises a plate body, a surface of the plate body close to the upper box body is provided with the card slot, and the card block is arranged in the card slot.

4. The battery device according to any one of claims 1 to 3, characterized in that: A first limiting structure is disposed on the side of the card block, and a second limiting structure is disposed on the side of the card slot, and the first limiting structure cooperates with the second limiting structure.

5. The battery device according to claim 4, characterized in that: The port of the card slot is a shrinkage structure; the end of the card block is a thickening structure and has a pointed end.

6. The battery device according to claim 5, characterized in that: The card slot comprises a first sub-card slot and a second sub-card slot which are connected to each other, wherein the second sub-card slot is located at a side of the first sub-card slot close to the card block; along the direction pointing to the card block, the cross-sectional area of ​​the first sub-card slot gradually increases; and the cross-sectional area of ​​the end of the first sub-card slot close to the second sub-card slot is larger than the cross-sectional area of ​​the second sub-card slot; The card block includes a first sub-card block and a second sub-card block connected to each other, the second sub-card block is located on a side of the first sub-card block close to the card slot; the cross-sectional area of ​​the second sub-card block gradually decreases along the direction pointing to the card slot; the cross-sectional area of ​​the end of the second sub-card block close to the first sub-card block is larger than the cross-sectional area of ​​the first sub-card block.

7. The battery device according to claim 5, characterized in that: Along the direction pointing to the card block, the cross-sectional area of ​​the card slot first gradually increases and then gradually decreases; The card block includes a first sub-card block and a second sub-card block connected to each other, the second sub-card block is located on a side of the first sub-card block close to the card slot; along the direction pointing to the card slot, the cross-sectional area of ​​the second sub-card block first gradually increases and then gradually decreases; the cross-sectional area of ​​the end of the second sub-card block close to the first sub-card block is larger than the cross-sectional area of ​​the first sub-card block.

8. The battery device according to claim 2, characterized in that: The connecting plate further comprises a reinforcing sheet, which is arranged between the plate body and the second protrusion; the orthographic projection of the second protrusion on the reinforcing sheet is located within the contour of the reinforcing sheet; The end surface of the first protrusion is arranged in contact with the reinforcing sheet.

9. The battery device according to claim 2, 3 or 8, characterized in that: The upper box body is an integrally formed structure; and / or, The connecting plate is an integrally formed structure.

10. The battery device according to any one of claims 1 to 3, characterized in that: The connecting plate is provided with a plurality of the second connecting structures; the upper box body is provided with a plurality of the first connecting structures which are arranged in cooperation with the plurality of the second connecting structures; A plurality of the second connecting structures are distributed in an array; or, the connecting plate includes an edge area, a central area and a middle area, the edge area is arranged around the middle area, the middle area is arranged around the central area, and the distribution density of the second connecting structures in the edge area and the central area is greater than the distribution density of the second connecting structures in the middle area.

11. The battery device according to any one of claims 1 to 3, characterized in that: The second connection structure spans across two adjacent battery cells.

12. The battery device according to any one of claims 1 to 3, characterized in that: The battery cell comprises a pole and a safety valve; the second connection structure is staggered with the pole and the safety valve.

13. An electrical equipment, characterized in that: It comprises a device body and a battery device according to any one of claims 1 to 12, wherein the battery device is arranged on the device body.

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