Battery device and vehicle

Abstract

The present disclosure relates to a battery device and a vehicle, the battery device comprising a battery box body, a battery pack comprising a plurality of single batteries arranged in the battery box body, an electrical connector and a crimping structure, the single battery comprising a battery body and an electrode arranged on a first surface of the battery body, the electrical connector being arranged on a side of the first surface of the single battery; the crimping structure being arranged at a position close to the electrode of the electrical connector and crimping the electrical connector on the electrode. Through the above structure design, the present disclosure adopts the crimping mode of the electrical connector and the electrode to realize the fixation and electrical contact of the two, replaces the existing welding scheme, can provide better crimping fixation strength, and has the advantages of convenient disassembly, low process precision requirement and the like, avoids many problems such as thermal stress or deformation, insufficient welding strength or welding defects, welding stress or corrosion, environmental pollution in the process and the like caused by the welding scheme.

Description

Technical Field

[0001] This disclosure relates to the field of automotive power battery technology, and more particularly to a battery device and a vehicle. Background Technology

[0002] In existing battery device designs, the electrodes of individual cells are connected to the busbar via welding to achieve electrical contact. However, battery devices suffer from numerous problems due to the welding process between the electrodes and the busbar, including thermal stress or deformation, insufficient welding strength or defects, difficulty in disassembly, welding stress or corrosion, environmental pollution during the process, high precision requirements, and wasted time and costs. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a battery device and a vehicle.

[0004] According to a first aspect of the present disclosure, a battery device is provided, including a battery housing, a battery pack comprising a plurality of individual cells, an electrical connector, and a pressing structure disposed within the battery housing. The individual cell includes a battery body and an electrode disposed on a first surface of the battery body. The electrical connector is located on one side of the first surface of the individual cell. The pressing structure is disposed near the electrode of the electrical connector and presses the electrical connector onto the electrode.

[0005] In some exemplary embodiments of this disclosure, the single cell is a liquid battery, the pressing structure includes an elastic member that elastically presses the electrical connector onto the electrode of the liquid battery; the battery device is provided with a pressure mechanism for applying pressure toward the electrode to the electrical connector.

[0006] In some exemplary embodiments of this disclosure, the elastic element is a disc spring, which is disposed between the electrical connector and the first surface, and the electrical connector and the electrode are in electrical contact via the disc spring; the convex surface of the disc spring faces the electrical connector, the first concave surface of the disc spring faces the battery body, and the disc spring contacts the electrode via the first concave surface and contacts the electrical connector via the convex surface.

[0007] In some exemplary embodiments of this disclosure, a first spacer is provided between the disc spring and the electrical connector. The first spacer is made of a conductive material, and the convex surface of the disc spring and the electrical connector are at least partially in indirect electrical contact via the first spacer.

[0008] In some exemplary embodiments of this disclosure, wherein: the first spacer is a gasket, the side surface of which faces the disc spring is a second concave surface and its shape matches the shape of the convex surface of the disc spring, and the side surface of the first spacer facing the electrical connector is a plane; or, the first spacer is a washer, which is located between the peripheral region of the convex surface of the disc spring and the electrical connector.

[0009] In some exemplary embodiments of this disclosure, the elastic modulus of the material of the first spacer is less than that of the material of the electrical connector.

[0010] In some exemplary embodiments of this disclosure, the first spacer is made of molybdenum or silver.

[0011] In some exemplary embodiments of this disclosure, the disc spring has a first end facing the electrical connector; the first spacer has a first inner limiting protrusion and a first outer limiting protrusion protruding on one side surface facing the disc spring, the first inner limiting protrusion being located inside the periphery of the first end and the first outer limiting protrusion being located outside the periphery of the first end, to limit the lateral displacement of the first end, thereby limiting the longitudinal deformation of the disc spring.

[0012] In some exemplary embodiments of this disclosure, a second spacer is provided between the disc spring and the single battery cell. The second spacer is made of a conductive material, and the first concave surface of the disc spring is in at least partially in indirect electrical contact with the electrode via the second spacer.

[0013] In some exemplary embodiments of this disclosure, wherein: the second spacer is a gasket, the side surface of which facing the electrode is a third concave surface and its shape matches the shape of the electrode, and the side surface of the second spacer facing the disc spring is a plane; or, the second spacer is a washer, which is located between the peripheral region of the first concave surface of the disc spring and the electrode.

[0014] In some exemplary embodiments of this disclosure, the elastic modulus of the material of the second spacer is less than that of the material of the electrode.

[0015] In some exemplary embodiments of this disclosure, the second spacer is made of molybdenum or silver.

[0016] In some exemplary embodiments of this disclosure, the disc spring has a second end facing the electrode; the second spacer protrudes with a second inner limiting protrusion and a second outer limiting protrusion, the second inner limiting protrusion being located inside the periphery of the second end and the second outer limiting protrusion being located outside the periphery of the second end, to limit the lateral displacement of the second end, thereby limiting the longitudinal deformation of the disc spring.

[0017] In some exemplary embodiments of this disclosure, wherein: the region of the convex surface of the disc spring adjacent to the central hole is provided with an arc-shaped transition structure; and / or, the region of the first concave surface of the disc spring adjacent to the periphery is provided with an arc-shaped transition structure.

[0018] In some exemplary embodiments of this disclosure, wherein: the disc spring has a first end facing the electrical connector; the electrical connector has a first inner limiting protrusion and a first outer limiting protrusion protruding on one side surface facing the disc spring, the first inner limiting protrusion being located inside the periphery of the first end and the first outer limiting protrusion being located outside the periphery of the first end, for limiting the lateral displacement of the first end, thereby limiting the longitudinal deformation of the disc spring; and / or, the disc spring has a second end facing the electrode; the electrode has a second inner limiting protrusion and a second outer limiting protrusion protruding, the second inner limiting protrusion being located inside the periphery of the second end and the second outer limiting protrusion being located outside the periphery of the second end, for limiting the lateral displacement of the second end, thereby limiting the longitudinal deformation of the disc spring.

[0019] In some exemplary embodiments of this disclosure, the disc spring is made of molybdenum or silver.

[0020] In some exemplary embodiments of this disclosure, the single cell is an all-solid-state battery; the battery device further includes a support body, and the battery pack is disposed in the support body; the pressing structure includes a pressure plate, the pressure plate is located on the side of the electrical connector facing away from the single cell, the pressure plate is connected to the support body, and rigidly presses the electrical connector onto the electrode of the all-solid-state battery.

[0021] In some exemplary embodiments of this disclosure, the electrode protrudes from the surface of the all-solid-state battery to form a boss structure, and the pressure plate rigidly presses the electrical connector onto the boss structure.

[0022] In some exemplary embodiments of this disclosure, the battery body has two first surfaces arranged at intervals along a first direction and facing opposite directions, and the electrodes disposed on the two first surfaces are respectively the positive electrode and the negative electrode of the single cell; wherein, the single cell is provided with electrical connectors on both sides in the first direction, and the pressing structure is disposed on the electrical connectors on both sides near the electrodes.

[0023] In some exemplary embodiments of this disclosure, the single cell is a cylindrical cell.

[0024] In some exemplary embodiments of this disclosure, the first surface of the battery body is provided with two electrodes, which are respectively the positive electrode and the negative electrode of the single cell; wherein, the single cell is provided with two electrical connectors on one side of the first surface, the two electrical connectors are respectively arranged corresponding to the two electrodes, and the two electrical connectors are respectively provided with the pressing structure near the electrodes.

[0025] In some exemplary embodiments of this disclosure, the single battery cell further includes a reinforcement structure disposed within the battery body for supporting the housing of the battery body.

[0026] According to a second aspect of the present disclosure, a vehicle is provided, wherein the vehicle includes the battery device proposed in the present disclosure and described in the above embodiments.

[0027] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The battery device proposed in this disclosure includes a battery housing and a battery pack comprising multiple individual cells, an electrical connector, and a pressing structure disposed within the battery housing. Each individual cell includes a battery body and an electrode disposed on a first surface of the battery body. The electrical connector of the battery device is located on one side of the first surface of the individual cell. The pressing structure is disposed near the electrode of the electrical connector, pressing the electrical connector onto the electrode. Through the above structural design, this disclosure uses the pressing of the electrical connector and the electrode to achieve fixation and electrical contact, replacing the existing welding scheme. This provides superior pressing fixation strength and has advantages such as easy assembly and disassembly, lower process precision requirements, and avoids many problems caused by welding schemes, such as thermal stress or deformation, insufficient welding strength or welding defects, welding stress or corrosion, and environmental pollution during the process.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0030] Figure 1 This is a perspective view of a portion of the structure of a battery device according to an exemplary embodiment of the present disclosure; Figure 2 yes Figure 1 A three-dimensional exploded view; Figure 3 yes Figure 2 A plan view of part of the structure is shown; Figure 4 It is along Figure 3A schematic diagram of the cross-section constructed by line AA in the diagram; Figure 5 yes Figure 4 An enlarged schematic diagram of the disc spring is shown; Figure 6 and Figure 7 They are Figure 1 A schematic cross-sectional view of the battery device at two different locations is shown; Figure 8 and Figure 9 These are exploded perspective views of partial structures of the battery device according to two other exemplary embodiments; Figure 10 This is a cross-sectional schematic diagram of the disc spring of a battery device shown in another exemplary embodiment; Figure 11 This is a cross-sectional schematic diagram of a single cell shown in another exemplary embodiment; Figure 12 This is a cross-sectional schematic diagram of a portion of the structure of a battery device, as shown in another exemplary embodiment.

[0031] Explanation of reference numerals in the attached figures: 100. Single cell battery; 110. Battery body; 1101. First surface; 120. Electrode; 121. Second inner limiting protrusion; 122. Second outer limiting protrusion; 130. Reinforce the structure; 200. Electrical connectors; 310. Disc spring; 311. Convex surface; 3111. Arc-shaped transition structure; 312. First concave surface; 3121. Arc-shaped transition structure; 313. Center hole; 314. First end; 315. Second end; 320. First spacer; 321. The second concave surface; 322. First inner limiting protrusion; 323. First outer limiting protrusion; 330. Second spacer; 340. Pressure plate; 400. Support body. Detailed Implementation

[0032] Some embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The embodiments described in the following examples of this disclosure are not representative of all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0034] See Figure 1 This illustration shows a three-dimensional schematic diagram of a portion of the structure of the battery device proposed in this disclosure. In this exemplary embodiment, the battery device proposed in this disclosure is illustrated using an on-board power battery as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of this disclosure to other types of battery devices, and these changes are still within the scope of the principles of the battery device proposed in this disclosure.

[0035] like Figure 1 As shown, in one embodiment of this disclosure, the battery device proposed in this disclosure includes a battery housing (not shown in the drawings), a battery pack, an electrical connector 200, and a pressing structure. The battery pack includes multiple individual cells 100, and the battery pack, electrical connector 200, and pressing structure are disposed within the battery housing. See also... Figures 2 to 7 , Figure 2 China representatively shows Figure 1 A three-dimensional exploded view; Figure 3 China representatively shows Figure 2 The diagram shown is a partial plan view of the structure, in which parts are hidden. Figure 2 The two electrical connectors 200; Figure 4 The middle section represents the direction along Figure 3 A schematic diagram of the cross-section constructed by line AA in the diagram; Figure 5 China representatively shows Figure 4 An enlarged schematic diagram of the disc spring 310 is shown; Figure 6 and Figure 7The figures above represent cross-sectional views of the battery device at two different locations. The structure, connection methods, and functional relationships of the main components of the battery device proposed in this disclosure will be described in detail below with reference to the figures.

[0036] like Figures 1 to 5 As shown, in one embodiment of this disclosure, a single cell 100 includes a battery body 110 and an electrode 120. The electrode 120 is disposed on a first surface 1101 of the battery body 110 (e.g., the end face of a cylindrical battery shown in the figure), and an electrical connector 200 is located on one side of the first surface 1101 of the single cell 100. A press-fit structure is disposed near the electrode 120 of the electrical connector 200, and the press-fit structure can press the electrical connector 200 onto the electrode 120, thereby achieving fixation and electrical contact between the electrical connector 200 and the electrode 120. Through the above structural design, this disclosure uses the press-fit method of the electrical connector 200 and the electrode 120 to achieve fixation and electrical contact between the two, replacing the existing welding scheme. This provides better press-fit fixing strength and has advantages such as easy disassembly and assembly, lower process precision requirements, and avoids many problems caused by the use of welding schemes, such as thermal stress or deformation, insufficient welding strength or welding defects, welding stress or corrosion, and environmental pollution in the process.

[0037] In one embodiment of this disclosure, the single-cell battery 100 is a liquid battery, and the pressing structure may include an elastic member that elastically presses the electrical connector 200 onto the electrode 120 of the liquid battery. The battery device may also be provided with a pressure mechanism for applying pressure to the electrical connector 200 toward the electrode 120. Through the above structural design, this disclosure utilizes an elastic member to achieve elastic pressing between the electrical connector 200 and the electrode 120.

[0038] like Figures 2 to 5 As shown, in one embodiment of this disclosure, the elastic element can be a disc spring 310, which is disposed between the electrical connector 200 and the first surface 1101, and the electrical connector 200 and the electrode 120 are in electrical contact via the disc spring 310. Specifically, the convex surface 311 of the disc spring 310 faces the electrical connector 200, and the first concave surface 312 of the disc spring 310 faces the battery body 110. The disc spring 310 contacts the electrode 120 via the first concave surface 312 and contacts the electrical connector 200 via the convex surface 311. Through the above structural design, this disclosure can utilize the disc spring 310 to achieve elastic pressing function, improving the stability and reliability of electrical contact, especially under vibration conditions. Among them, the disc spring 310 has better pressure resistance than ordinary springs, and it can withstand greater pressure (e.g., several times the pressure of MPa, specifically 30kPa~400MPa) to ensure that the battery body 110 does not deform or get damaged during the pressing process.

[0039] In one embodiment of this disclosure, the disc spring 310 can be made of molybdenum. Based on the material properties of molybdenum, this disclosure offers the following advantages through the above design: improved electrical connection and heat dissipation; reduced thermomechanical stress, lowering thermomechanical stress and sintering residual stress without significantly increasing the heat treatment temperature; reduced impact of thermal stress on the battery cell, thereby improving the overall performance and reliability of the device (e.g., IGBT module); improved mechanical pressure at the edge of the electrode 120, ensuring consistent mechanical pressure on the chip surface, which is crucial for maintaining device performance; enhanced thermal fatigue resistance of the electrode 120, which is important for controlling electrode temperature under high-power operating conditions; and facilitated double-sided heat dissipation of the device, which is highly beneficial for controlling junction temperature under high-power operating conditions. In other embodiments of this disclosure, the first spacer 320 can also be made of silver, thereby effectively improving the problem of excessively high contact resistance caused by crimping.

[0040] like Figure 2 and Figure 3 As shown, in one embodiment of this disclosure, a first spacer 320 may be provided between the disc spring 310 and the electrical connector 200. The first spacer 320 is made of a conductive material. The convex surface 311 of the disc spring 310 and the electrical connector 200 are at least partially in indirect electrical contact via the first spacer 320. That is, the first spacer 320 provides a spacer and current-passing function between the disc spring 310 and the electrical connector 200. Through the above structural design, this disclosure can reduce or avoid wear caused by direct contact between the disc spring 310 and the electrical connector 200, extend the service life of the components, and improve the stability and reliability of the electrical contact. In another embodiment of this disclosure, a spacer structure may not be provided between the disc spring 310 and the electrical connector 200, that is, the disc spring 310 and the electrical connector 200 can be in direct contact, and this is not limited to this embodiment.

[0041] like Figures 2 to 4As shown, based on the structural design of a first spacer 320 between the disc spring 310 and the electrical connector 200, in one embodiment of this disclosure, the first spacer 320 can be a gasket. The surface of the gasket facing the disc spring 310 is a second concave surface 321, and the shape of the second concave surface 321 matches the shape of the convex surface 311 of the disc spring 310. The surface of the first spacer 320 facing the electrical connector 200 is a plane, that is, the plane is in full contact with the surface of the electrical connector 200 (e.g., surface contact). Through the above structural design, this disclosure can increase the contact area when the disc spring 310 and the electrical connector 200 are indirectly contacted through the first spacer 320, and achieve full contact between the first spacer 320 and the disc spring 310 and the electrical connector 200 respectively. This is beneficial for more fully transmitting the pressure from the pressure mechanism to the disc spring 310 so that it can produce more full deformation, and optimize the fixing and electrical contact effect of the press-fitting form. In addition, the sheet-like structure of the first separator 320 has advantages such as simple structure and easy processing. In some other embodiments of this disclosure, the first separator 320 can also be a washer, which is located between the peripheral area of ​​the convex surface 311 of the disc spring 310 and the electrical connector 200. Accordingly, while realizing the functions of separator and current flow, this disclosure can reduce the amount of raw materials used in the first separator 320, reduce material costs, and reduce the weight of components, further meeting the lightweight design requirements of battery devices, and reducing costs and increasing efficiency.

[0042] Based on the structural design of a first spacer 320 between the disc spring 310 and the electrical connector 200, in one embodiment of this disclosure, the elastic modulus of the material of the first spacer 320 can be less than the elastic modulus of the material of the electrical connector 200. Through this design, this disclosure can further reduce wear between the disc spring 310 and the first spacer 320, further extend the service life of the components, and further improve the stability and reliability of the electrical contact.

[0043] In one embodiment of this disclosure, the first spacer 320 may be made of molybdenum or silver. Furthermore, the electrical connector 200 may be made of copper or aluminum.

[0044] like Figure 6As shown, based on the structural design of a first spacer 320 between the disc spring 310 and the electrical connector 200, in one embodiment of this disclosure, the disc spring 310 has a first end 314 facing the electrical connector 200. A first inner limiting protrusion 322 and a first outer limiting protrusion 323 protrude from the surface of the first spacer 320 facing the disc spring 310. The first inner limiting protrusion 322 is located inside the periphery of the first end 314, and the first outer limiting protrusion 323 is located outside the periphery of the first end 314, to limit the lateral displacement of the first end 314, thereby limiting the longitudinal deformation of the disc spring 310. In the circumferential direction of the first spacer 320, the first inner limiting protrusion 322 and the first outer limiting protrusion 323 can be a closed annular structure, or an intermittent point-like or line-like structure. Through the above structural design, since the disc spring 310 will deform longitudinally (e.g., in a direction perpendicular to the first surface 1101) when compressed, and each of the two ends of the disc spring 310 will displace laterally, this disclosure can use the limiting protrusion provided in the first spacer 320 to limit one end of the disc spring 310 laterally, thereby limiting the longitudinal deformation amplitude of the disc spring 310, avoiding excessive compression of the disc spring 310 that could cause structural damage or even breakage, and at the same time avoiding excessive rebound of the disc spring 310 that could affect the fixing and electrical contact effect of the crimping structure. In some other embodiments of this disclosure, when the disc spring 310 is in direct contact with the electrical connector 200, the above-mentioned first inner limiting protrusion 322 and first outer limiting protrusion 323 may also protrude from the side surface of the electrical connector 200 facing the disc spring 310, and are not limited to this embodiment.

[0045] like Figure 2 and Figure 7As shown, in one embodiment of this disclosure, the disc spring 310 is in direct contact with the electrode 120. The disc spring 310 has a second end portion 315 facing the electrode 120. The electrode 120 has a second inner limiting protrusion 121 and a second outer limiting protrusion 122. The second inner limiting protrusion 121 is located inside the periphery of the second end portion 315, and the second outer limiting protrusion 122 is located outside the periphery of the second end portion 315, to limit the lateral displacement of the second end portion 315, thereby limiting the longitudinal deformation of the disc spring 310. In the circumferential direction of the electrode 120, the second inner limiting protrusion 121 and the second outer limiting protrusion 122 can be a closed annular structure, or an intermittent point-like or line-like structure. Through the above structural design, this disclosure can utilize the limiting protrusion provided in the second spacer 330 to limit the other end of the disc spring 310 in the lateral direction, thereby limiting the longitudinal deformation of the disc spring 310, preventing the disc spring 310 from being over-compressed and causing structural damage or even breakage, and at the same time preventing the disc spring 310 from excessively rebounding and affecting the fixing and electrical contact effect of the crimping structure. In some other embodiments of this disclosure, when a spacer structure (such as the second spacer 330 described below) is provided between the disc spring 310 and the electrical connector 200, the second inner limiting protrusion 121 and the second outer limiting protrusion 122 may also protrude from the side surface of the spacer structure facing the disc spring 310, and are not limited to this embodiment.

[0046] See Figure 8 , Figure 8 The diagram shows a representative exploded perspective view of a portion of the structure of a battery device that embodies the principles of this disclosure in another exemplary embodiment.

[0047] like Figure 8 As shown, in one embodiment of this disclosure, a second spacer 330 may be provided between the disc spring 310 and the single battery cell 100. The second spacer 330 is made of a conductive material. The first concave surface 312 of the disc spring 310 and the electrode 120 are at least partially electrically contacted indirectly through the second spacer 330. That is, the second spacer 330 provides a spacer and current-passing function between the disc spring 310 and the electrode 120. In addition, a first spacer 320 is also provided between the disc spring 310 and the electrical connector 200, as detailed above. Figures 2 to 4 The illustrated embodiment describes the first spacer 320. Through the above structural design, this disclosure can reduce or avoid wear caused by direct contact between the disc spring 310 and the electrode 120, extend the service life of components, and improve the stability and reliability of electrical contact. In another embodiment of this disclosure (e.g.) Figure 1In the embodiment shown, the disc spring 310 and the electrode 120 may not have a spacer structure, that is, the disc spring 310 and the electrical connector 200 can be in direct contact, and this is not limited to this embodiment.

[0048] like Figure 8 As shown, based on the structural design of a second separator 330 between the disc spring 310 and the single cell 100, in one embodiment of this disclosure, the second separator 330 can be a washer located between the peripheral region of the first concave surface 312 of the disc spring 310 and the electrode 120. Furthermore, when the disc spring 310 is deformed under pressure, a portion of it indirectly contacts the electrode 120 via the second separator 330, while another portion of the disc spring 310 can pass through the opening of the washer and directly contact the electrode 120. Through the above structural design, while achieving the functions of separator and current flow, this disclosure can reduce the amount of raw materials used in the second separator 330, lower material costs, and reduce component weight, further meeting the lightweight design requirements of the battery device, thus reducing costs and increasing efficiency. In some other embodiments of this disclosure, the second spacer 330 may also be a gasket, that is, the first concave surface 312 of the disc spring 310 is indirectly in contact with the electrode 120 through the gasket. Accordingly, this disclosure can expand the contact area when the disc spring 310 and the electrode 120 are indirectly in contact through the second spacer 330, and achieve sufficient contact between the second spacer 330 and the disc spring 310 and the electrode 120 respectively, thereby optimizing the fixing and electrical contact effect of the pressing form.

[0049] Based on the structural design of a second spacer 330 between the disc spring 310 and the electrode 120, in one embodiment of this disclosure, the elastic modulus of the material of the second spacer 330 can be less than the elastic modulus of the material of the electrode 120. Through this design, this disclosure can further reduce wear between the disc spring 310 and the second spacer 330, further extend the service life of the components, and further improve the stability and reliability of electrical contact.

[0050] In one embodiment of this disclosure, the second spacer 330 may be made of molybdenum or silver. Furthermore, the electrical connector 200 may be made of copper or aluminum.

[0051] See Figure 9 , Figure 9 The diagram shows a representative exploded perspective view of a portion of the structure of a battery device that embodies the principles of this disclosure in another exemplary embodiment.

[0052] like Figure 9As shown, in one embodiment of this disclosure, the convex surface 311 of the disc spring 310 can directly contact the electrical connector 200, that is, no spacer structure is required between the disc spring 310 and the electrical connector 200. Furthermore, the first concave surface 312 of the disc spring 310 can directly contact the electrode 120, that is, no spacer structure is required between the disc spring 310 and the electrode 120.

[0053] See Figure 10 , Figure 10 The diagram shows a cross-sectional schematic of a disc spring 310 in another exemplary embodiment of a battery device that embodies the principles of this disclosure.

[0054] like Figure 10 As shown, in one embodiment of this disclosure, the area of ​​the convex surface 311 of the disc spring 310 adjacent to the central hole 313 can be provided with an arc-shaped transition structure 3111. For example, the opening of the central hole 313 of the disc spring 310 on the first end 314 can be rounded to form the arc-shaped transition structure 3111. Through the above structural design, this disclosure utilizes the arc-shaped transition structure 3111 to improve the strength of electrical contact under vibration conditions.

[0055] like Figure 10 As shown, in one embodiment of this disclosure, an arc-shaped transition structure 3121 may be provided in the region adjacent to the periphery of the first concave surface 312 of the disc spring 310. For example, the inner periphery of the disc spring 310 at the second end 315 may be rounded to form the arc-shaped transition structure 3121. Through the above structural design, this disclosure utilizes the arc-shaped transition structure 3121 to improve the strength of electrical contact under vibration conditions.

[0056] See Figure 11 , Figure 11 The diagram shows a cross-sectional schematic of a single cell 100 in another exemplary embodiment of a battery device that embodies the principles of this disclosure.

[0057] like Figure 11As shown, in one embodiment of this disclosure, the single cell 100 is an all-solid-state battery. Based on this, the battery device may further include a support body 400, in which the battery pack is disposed. The pressing structure may include a pressure plate 340, which is located on the side of the electrical connector 200 facing away from the single cell 100 (e.g., connected by bolts or other connectors), and the pressure plate 340 is connected to the support body 400 (e.g., the position of the support body 400 connected to the pressure plate 340 may be slightly lower than the height of the top surface of the electrical connector 200). The pressure plate 340 rigidly presses the electrical connector 200 onto the electrode 120 of the all-solid-state battery. Through the above structural design, this disclosure utilizes the pressure plate 340, which cooperates with the support body 400, to achieve rigid pressing of the electrical connector 200 and the electrode 120, suitable for all-solid-state batteries that require high pressure and a certain level of conductivity to operate.

[0058] like Figure 11 As shown, in one embodiment of this disclosure, the electrode 120 protrudes from the surface of the all-solid-state battery to form a boss structure, and the pressure plate 340 rigidly presses the electrical connector 200 onto the boss structure. Through the above structural design, this disclosure can utilize the boss structure to enhance the pressing effect, increase the contact surface, and further adapt to all-solid-state batteries.

[0059] like Figure 1 , Figure 2 , Figure 8 or Figure 9 As shown, in some embodiments of this disclosure, the battery body 110 may have two first surfaces 1101 arranged at intervals along a first direction and facing opposite directions. This first direction may be, for example, the longitudinal direction shown in the figures. The electrodes 120 disposed on these two first surfaces 1101 are respectively the positive electrode and the negative electrode of the single cell 100. Based on this, electrical connectors 200 are respectively disposed on both sides of the single cell 100 in the first direction, and the electrical connectors 200 on both sides are respectively disposed with a pressing structure (e.g., a disc spring 310) near the electrode 120.

[0060] Based on the structural design of the battery body 110 having two first surfaces 1101 opposite to each other along a first direction, in one embodiment of this disclosure, the battery housing may include a top plate (e.g., a top cover) and a bottom plate (e.g., a bottom support plate or a bottom protective plate) arranged at intervals, with the first direction perpendicular to the top plate or the bottom plate. The top plate and the bottom plate are each provided with a pressure mechanism. In other words, taking the cylindrical battery shown in the accompanying drawings as an example, the cylindrical battery in this embodiment is arranged in a "vertical" form in the battery device. In other embodiments of this disclosure, the battery may also be arranged in a "lying" form, in which case the pressure mechanism may be provided on the frame or beam structure of the battery housing, and is not limited to this embodiment.

[0061] like Figure 1 , Figure 2 , Figure 8 or Figure 9 As shown, based on the structural design of the battery body 110 having two first surfaces 1101 opposite to each other along the first direction, in some embodiments of this disclosure, the single cell 100 can be a cylindrical cell, that is, the cross-section of the battery body 110 can be circular. In other embodiments of this disclosure, the single cell 100 can be a battery with other structural forms, for example, the cross-section of the battery body 110 can also be rectangular (e.g., blade battery), and is not limited to this embodiment.

[0062] In other embodiments not illustrated in this disclosure, unlike the design where the positive and negative electrodes are respectively disposed on two opposite surfaces, the battery body 110 can have two electrodes 120 disposed on a first surface 1101. In other words, the positive and negative electrodes of a single cell 100 (e.g., a square-shell battery with positive and negative electrodes led out on the same side) can be disposed on the same surface of the battery body 110. The single cell 100 is provided with two electrical connectors 200 on one side of the first surface 1101. The two electrical connectors 200 are respectively arranged corresponding to the two electrodes 120. The two electrical connectors 200 are respectively provided with a crimping structure near the electrodes 120.

[0063] In one embodiment of this disclosure, the pressure mechanism may be a pressure output structure using a spring, or it may be other specific structures such as a disc spring or a crimping bolt.

[0064] See Figure 12 , Figure 12 The diagram shows a cross-sectional schematic of a portion of the structure of a battery device that embodies the principles of this disclosure in another exemplary embodiment.

[0065] like Figure 12As shown, in one embodiment of this disclosure, the single-cell battery 100 may further include a reinforcing structure 130 disposed within the battery body 110, which supports the casing of the battery body 110. Specifically, the reinforcing structure 130 may be a metal bracket or a locally reinforced structure using composite materials. Through the above structural design, this disclosure utilizes the reinforcing structure 130 to ensure that the single-cell battery 100 does not deform or become damaged during the pressing process. The single-cell battery 100 with the reinforcing structure 130 may be a cylindrical battery, a prismatic battery, or a pouch battery. Furthermore, in addition to the reinforcing structure 130, such as a bracket, disposed within the battery body 110, the single-cell battery 100 may be further reinforced. Cylindrical batteries, due to their inherent high strength, do not require additional reinforcement. Prismatic batteries, due to their inherent strength, may also not require additional reinforcement, or they may be reinforced by using a structure such as a frame as a constraint device for the prismatic all-solid-state battery before pressing. Because pouch batteries lack structural strength, they require separate structural reinforcement at the outer tabs (battery terminals) to prevent damage to the pouch battery body. In addition, the outer tabs and the battery body should not be on the same stress line.

[0066] It should be noted that the battery devices shown in the accompanying drawings and described in this specification are merely a few examples among many battery devices capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the battery devices shown in the accompanying drawings or described in this specification.

[0067] Based on the above detailed description of several exemplary embodiments of the battery device proposed in this disclosure, an exemplary embodiment of the vehicle proposed in this disclosure will be described below.

[0068] In one embodiment of this disclosure, the vehicle proposed in this disclosure includes the battery device proposed in this disclosure and described in detail in the above embodiments.

[0069] It should be noted that the battery packs shown in the accompanying drawings and described in this specification are merely a few examples among many battery packs capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the battery packs shown in the accompanying drawings or described in this specification.

[0070] Based on the above detailed description of an exemplary embodiment of the battery pack disclosed herein, an exemplary embodiment of the vehicle disclosed herein will be described below.

[0071] In one embodiment of this disclosure, the vehicle proposed in this disclosure includes the battery pack proposed in this disclosure and described in the above embodiments.

[0072] The vehicles disclosed herein can be hybrid vehicles, electric vehicles, or other types of vehicles. The vehicles can be autonomous vehicles, semi-autonomous vehicles, or non-autonomous vehicles.

[0073] It should be noted that the vehicles shown in the accompanying drawings and described in this specification are merely a few examples among many vehicles capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the vehicles shown in the accompanying drawings or described in this specification.

[0074] The battery device disclosed herein includes a single cell 100, which includes a battery body 110 and an electrode 120 disposed on a first surface 1101 of the battery body 110. An electrical connector 200 of the battery device is located on one side of the first surface 1101 of the single cell 100. A disc spring 310 is disposed between the electrical connector 200 and the first surface 1101. The convex surface of the disc spring 310 faces the electrical connector 200, and the first concave surface of the disc spring 310 faces the battery body 110. The disc spring 310 contacts the electrode 120 via the first concave surface and contacts the electrical connector 200 via the convex surface. The battery device is provided with a pressure mechanism for applying pressure toward the electrode 120 to the electrical connector 200, so that the electrical connector 200 presses the disc spring 310 onto the electrode 120, and the electrical connector 200 and the electrode 120 are in electrical contact via the disc spring 310. Through the above structural design, this disclosure uses the electrical connector 200 and the electrode 120 to achieve fixation and electrical contact, replacing the existing welding scheme. It can provide better pressure fixing strength and has the advantages of easy disassembly and assembly and lower process precision requirements. It avoids many problems caused by the use of welding scheme, such as thermal stress or deformation, insufficient welding strength or welding defects, welding stress or corrosion, and environmental pollution in the process.

[0075] Specifically, by employing the above-mentioned disc spring-based pressing scheme to achieve the fixation and electrical contact between the electrical connector and the electrode, the battery device proposed in this disclosure has the following beneficial effects: Overcoming thermal impact issues: The crimping technology does not involve high-temperature processes, so it will not cause thermal damage to sensitive components such as battery cells, thus protecting battery performance and lifespan.

[0076] Improving welding quality consistency: Crimping technology forms a connection through mechanical pressure, avoiding defects that may occur during the welding process, such as incomplete welding or over-welding, thus ensuring the consistency of the connection quality.

[0077] Reduced structural limitations: Crimping technology does not require additional welding space or maintenance access, has lower requirements for product structure, and provides greater design flexibility.

[0078] Reduced welding deformation: Since crimping does not involve high temperatures, it reduces material deformation caused by thermal expansion, maintaining the dimensional accuracy and assembly performance of the battery pack.

[0079] Solving material compatibility issues: Crimping technology does not depend on the melting point of materials, so it can be used to join different materials (such as aluminum and copper) without the need for special welding techniques and materials.

[0080] Cost reduction: Crimping technology reduces the process and material costs associated with welding. Especially in automated production, crimping is fast and easy to operate, which helps to reduce overall production costs.

[0081] Improved connection reliability: Crimping technology provides stable and reliable electrical and mechanical connections, especially demonstrating high reliability in high vibration and thermal cycling environments.

[0082] Improved production efficiency: The crimping operation is simple, quick, and easy to automate, which improves the efficiency of the production line and reduces the time cost when producing large quantities of products.

[0083] Environmental stability: Crimping technology can maintain the stability of the connection under various harsh environmental conditions, and is not affected by environmental factors such as temperature and humidity.

[0084] Enhanced flexibility and adaptability: Crimping technology can accommodate wires of different sizes, providing greater flexibility and applicability to a variety of different battery pack designs and application scenarios.

[0085] In summary, this disclosure provides an effective alternative to welding in the field of battery pack assembly using press-fit electrical connection technology. It overcomes the shortcomings of welding technology and brings many benefits such as improved reliability, reduced costs, and enhanced flexibility.

[0086] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0087] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous for any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0088] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0089] It should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein according to the specific circumstances.

[0090] Although terms such as “first” and “second” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0092] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery device, characterized in that, The device includes a battery housing and a battery pack comprising multiple individual cells (100), an electrical connector (200), and a pressing structure disposed within the battery housing. Each individual cell (100) includes a battery body (110) and an electrode (120) disposed on a first surface (1101) of the battery body (110). The electrical connector (200) is located on one side of the first surface (1101) of the individual cell (100). The pressing structure is disposed near the electrode (120) of the electrical connector (200) and presses the electrical connector (200) onto the electrode (120).

2. The battery device according to claim 1, characterized in that, The single cell (100) is a liquid battery. The pressing structure includes an elastic element that elastically presses the electrical connector (200) onto the electrode (120) of the liquid battery. The battery device is provided with a pressure mechanism that applies pressure to the electrical connector (200) toward the electrode (120).

3. The battery device according to claim 2, characterized in that, The elastic element is a disc spring (310), which is disposed between the electrical connector (200) and the first surface (1101). The electrical connector (200) and the electrode (120) are in electrical contact via the disc spring (310). The convex surface (311) of the disc spring (310) faces the electrical connector (200), and the first concave surface (312) of the disc spring (310) faces the battery body (110). The disc spring (310) contacts the electrode (120) via the first concave surface (312) and contacts the electrical connector (200) via the convex surface (311).

4. The battery device according to claim 3, characterized in that, A first spacer (320) is provided between the disc spring (310) and the electrical connector (200). The first spacer (320) is made of a conductive material. The convex surface (311) of the disc spring (310) and the electrical connector (200) are at least partially in indirect electrical contact via the first spacer (320).

5. The battery device according to claim 4, characterized in that: The first spacer (320) is a gasket, the side of which faces the disc spring (310) is a second concave surface (321) and its shape matches the shape of the convex surface (311) of the disc spring (310), and the side of the first spacer (320) facing the electrical connector (200) is a flat surface; or The first spacer (320) is a washer located between the peripheral area of ​​the convex surface (311) of the disc spring (310) and the electrical connector (200).

6. The battery device according to claim 4, characterized in that, The elastic modulus of the material of the first spacer (320) is less than that of the material of the electrical connector (200).

7. The battery device according to claim 6, characterized in that, The first spacer (320) is made of molybdenum or silver.

8. The battery device according to claim 4, characterized in that, The disc spring (310) has a first end (314) facing the electrical connector (200); the first spacer (320) has a first inner limiting protrusion (322) and a first outer limiting protrusion (323) protruding on one side surface facing the disc spring (310). The first inner limiting protrusion (322) is located inside the periphery of the first end (314), and the first outer limiting protrusion (323) is located outside the periphery of the first end (314) to limit the lateral displacement of the first end (314), thereby limiting the longitudinal deformation of the disc spring (310).

9. The battery device according to claim 3, characterized in that, A second spacer (330) is provided between the disc spring (310) and the single cell (100). The second spacer (330) is made of conductive material. The first concave surface (312) of the disc spring (310) is in at least partially electrically contacted with the electrode (120) via the second spacer (330).

10. The battery device according to claim 9, characterized in that: The second spacer (330) is a gasket, the surface of which facing the electrode (120) is a third concave surface, and its shape matches the shape of the electrode (120). The surface of the second spacer (330) facing the disc spring (310) is a flat surface; or The second spacer (330) is a washer located between the peripheral region of the first concave surface (312) of the disc spring (310) and the electrode (120).

11. The battery device according to claim 9, characterized in that, The elastic modulus of the material of the second spacer (330) is less than that of the material of the electrode (120).

12. The battery device according to claim 11, characterized in that, The material of the second spacer (330) is molybdenum or silver.

13. The battery device according to claim 9, characterized in that, The disc spring (310) has a second end (315) facing the electrode (120); the second spacer (330) has a second inner limiting protrusion (121) and a second outer limiting protrusion (122), the second inner limiting protrusion (121) is located inside the periphery of the second end (315), and the second outer limiting protrusion (122) is located outside the periphery of the second end (315), in order to limit the lateral displacement of the second end (315), thereby limiting the longitudinal deformation of the disc spring (310).

14. The battery device according to claim 3, characterized in that: The area of ​​the convex surface (311) of the disc spring (310) adjacent to the central hole (313) is provided with an arc-shaped transition structure (3111); and / or The first concave surface (312) of the disc spring (310) adjacent to the periphery is provided with an arc-shaped transition structure (3111).

15. The battery device according to claim 3, characterized in that: The disc spring (310) has a first end (314) facing the electrical connector (200); the electrical connector (200) has a first inner limiting protrusion (322) and a first outer limiting protrusion (323) protruding on one side surface facing the disc spring (310), the first inner limiting protrusion (322) being located inside the periphery of the first end (314), and the first outer limiting protrusion (323) being located outside the periphery of the first end (314), to limit the lateral displacement of the first end (314), thereby limiting the longitudinal deformation of the disc spring (310); and / or The disc spring (310) has a second end (315) facing the electrode (120); the electrode (120) has a second inner limiting protrusion (121) and a second outer limiting protrusion (122), the second inner limiting protrusion (121) is located inside the periphery of the second end (315), and the second outer limiting protrusion (122) is located outside the periphery of the second end (315), in order to limit the lateral displacement of the second end (315), thereby limiting the longitudinal deformation of the disc spring (310).

16. The battery device according to claim 3, characterized in that, The disc spring (310) is made of molybdenum or silver.

17. The battery device according to claim 1, characterized in that, The single cell (100) is an all-solid-state battery; the battery device also includes a support body (400), and the battery pack is disposed in the support body (400); the pressing structure includes a pressure plate (340), the pressure plate (340) is located on the side of the electrical connector (200) facing away from the single cell (100), the pressure plate (340) is connected to the support body (400), and the electrical connector (200) is rigidly pressed onto the electrode (120) of the all-solid-state battery.

18. The battery device according to claim 17, characterized in that, The electrode (120) protrudes from the surface of the all-solid-state battery to form a boss structure, and the pressure plate (340) rigidly presses the electrical connector (200) onto the boss structure.

19. The battery device according to any one of claims 1 to 18, characterized in that, The battery body (110) has two first surfaces (1101) arranged at intervals along a first direction and facing opposite directions. The electrodes (120) provided on the two first surfaces (1101) are respectively the positive electrode and the negative electrode of the single cell (100). The single cell (100) is provided with electrical connectors (200) on both sides in the first direction, and the electrical connectors (200) on both sides are provided with the pressing structure near the electrode (120).

20. The battery device according to claim 19, characterized in that, The single cell (100) is a cylindrical cell.

21. The battery device according to any one of claims 1 to 18, characterized in that, The first surface (1101) of the battery body (110) is provided with two electrodes (120), which are respectively the positive electrode and the negative electrode of the single cell (100); wherein, the single cell (100) is provided with two electrical connectors (200) on one side of the first surface (1101), the two electrical connectors (200) are respectively arranged corresponding to the two electrodes (120), and the two electrical connectors (200) are respectively provided with the crimping structure near the electrodes (120).

22. The battery device according to claim 1, characterized in that, The single battery cell (100) also includes a reinforcing structure (130), which is disposed within the battery body (110) and is used to support the housing of the battery body (110).

23. A vehicle, characterized in that, The vehicle includes the battery device according to any one of claims 1 to 22.

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