Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a first electrode terminal and a second electrode terminal, wherein the first electrode terminal and the second electrode terminal are opposite in polarity. The shell is provided with a first wall, the first wall is made of steel, and the thickness of the first wall is larger than or equal to 0.2 mm and smaller than or equal to 1.5 mm. The electrode assembly is arranged in the shell. The first electrode terminal and the second electrode terminal are arranged on the first wall in a spaced mode in the first direction, the first electrode terminal and the second electrode terminal are electrically connected with the electrode assembly, and the first direction is the length direction of the first wall. In the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, the length of the first wall is b, and a / b is larger than or equal to 40% and smaller than or equal to 90%. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery cell, a battery device and an electrical device. The technical solution provided in the present application can effectively improve the reliability of the battery device.

[0005] In a first aspect, some embodiments of the present application provide a battery cell, comprising a housing, an electrode assembly, and a first electrode terminal and a second electrode terminal with opposite polarities. The housing has a first wall, the material of the first wall is steel, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly is disposed in the housing. Along a first direction, the first electrode terminal and the second electrode terminal are spaced apart from each other on the first wall, and the first electrode terminal and the second electrode terminal are electrically connected to the electrode assembly, respectively, and the first direction is the length direction of the first wall. Particularly, along the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, and the length of the first wall is b, satisfying 40%≤a / b≤90%.

[0006] In the above scheme, on the one hand, the thickness of the first wall of the shell is set to be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall is thin, which can reduce the influence of the thickness of the shell on the volume of the battery monomer, improve the space utilization of the electrode assembly, and thus facilitate the improvement of the volumetric energy density of the battery monomer; on the other hand, by arranging the first electrode terminal and the second electrode terminal with opposite polarities on the same wall part, the electrode terminal single-side tab can effectively improve the space utilization of the electrode assembly compared with the double-side tab scheme, thereby facilitating the improvement of the volumetric energy density of the battery monomer; on the other hand, under the condition of limiting the thickness of the first wall, through multiple tests and comparisons, by limiting the center distance of the first electrode terminal and the second electrode terminal, the ratio between the center distance and the length of the first wall is greater than or equal to 40% and less than or equal to 90%, which can effectively improve the anti-deformation ability under the condition of thin thickness of the first wall, thereby reducing the risk of mutual separation of the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly caused by the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0007] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and along the first direction, the center distance a of the first electrode terminal and the second electrode terminal is greater than or equal to 105 mm and less than or equal to 160 mm.

[0008] In some battery monomers in which the length of the first wall is greater than or equal to 170 mm and less than 210 mm, by limiting the value of the center distance of the first electrode terminal and the second electrode terminal, the value is greater than or equal to 105 mm and less than or equal to 160 mm, which can effectively improve the anti-deformation ability under the condition of thin thickness of the first wall and the condition that the length of the first wall is greater than or equal to 170 mm and less than 210 mm, thereby reducing the risk of mutual separation of the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly caused by the impact of the internal expansion force of the battery monomer on the first wall, thereby improving the reliability of the battery monomer, and further improving the reliability of the battery device.

[0009] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and satisfies 50%≤a / b≤85%.

[0010] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 170 mm and less than 210 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the ratio of the center distance to the length of the first wall is greater than or equal to 50% and less than or equal to 85%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 170 mm and less than 210 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal and the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0011] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 210 mm and less than 240 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 120 mm and less than or equal to 190 mm.

[0012] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the center distance is greater than or equal to 120 mm and less than or equal to 190 mm, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0013] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, satisfying 50%≤a / b≤82%.

[0014] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the ratio of the center distance to the length of the first wall is greater than or equal to 50% and less than or equal to 82%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal from the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0015] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 240 mm and less than 270 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 135 mm and less than or equal to 213 mm.

[0016] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 240 mm and less than 270 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the center distance is greater than or equal to 135 mm and less than or equal to 213 mm, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal from the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0017] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 240 mm and less than 270 mm, satisfying 50%≤a / b≤79%.

[0018] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 240 mm and less than 270 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the ratio of the center distance to the length of the first wall is greater than or equal to 50% and less than or equal to 79%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal and the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0019] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 170 mm and less than or equal to 230 mm.

[0020] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the center distance is greater than or equal to 170 mm and less than or equal to 230 mm, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal from the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0021] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, satisfying 50%≤a / b≤75%.

[0022] In the above scheme, in some battery cells where the length of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the ratio of the center distance to the length of the first wall is greater than or equal to 55.5% and less than or equal to 71.9%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall, resulting in separation of the electrode terminal from the first wall or disconnection of the circuit between the electrode terminal and the electrode assembly, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0023] According to some embodiments of the present application, the first wall is made of steel, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

[0024] In the above solution, by setting the material of the first wall to steel with greater structural strength, on the one hand, the anti-expansion ability of the shell can be improved, and on the other hand, the thickness of the first wall can be further reduced, so that the space utilization of the battery cell is improved, thereby making the volume energy density of the battery cell high, and further making the volume energy density of the battery device high.

[0025] According to some embodiments of the present application, the housing includes a shell and an end cap, the shell having a first opening, the end cap being connected to the shell and closing the first opening, the first wall being the end cap, and the thickness of the first wall being greater than the thickness of the shell.

[0026] In the above scheme, by setting the thickness of the first wall to be greater than the thickness of the shell, on the one hand, the structural strength lost due to the opening of the first wall to set the electrode terminal can be compensated for, so that the reliability of the battery monomer is high, on the other hand, the thickness of the shell can be made thinner, the space utilization rate of the electrode assembly can be improved, thereby facilitating the improvement of the volumetric energy density of the battery monomer, and further facilitating the improvement of the volumetric energy density of the battery device.

[0027] According to some embodiments of the present application, the material of the shell is steel, the thickness of the shell is not less than 0.075mm and not more than 0.35mm.

[0028] In the above scheme, by setting the material of the shell to be steel with high structural strength, on the one hand, the expansion resistance of the shell can be improved, on the other hand, the thickness of the shell can be further thinned to improve the space utilization rate of the battery monomer, thereby improving the volumetric energy density of the battery monomer, and further improving the volumetric energy density of the battery device.

[0029] According to some embodiments of the present application, the material of the shell is steel, the thickness of the shell is not less than 0.15mm and not more than 0.25mm.

[0030] According to some embodiments of the present application, the battery monomer further comprises a first connecting piece, the first connecting piece is at least partially disposed on the outer periphery of the first electrode terminal, and the first connecting piece is used to fix the first electrode terminal to the first wall.

[0031] In the above scheme, by setting the first connecting piece on the outer periphery of the first electrode terminal, on the one hand, the first electrode terminal can be effectively fixed to the first wall, reducing the risk of the first electrode terminal separating from the first wall and causing the internal circuit of the battery monomer to be disconnected, so that the reliability of the battery monomer is high; on the other hand, by fixing the first electrode terminal to the first wall through the first connecting piece, the assembly difficulty of the battery monomer can be effectively reduced, and the assembly rhythm of the first electrode terminal can be improved, thereby facilitating the improvement of the manufacturing efficiency of the battery monomer.

[0032] According to some embodiments of the present application, along the thickness direction of the first wall, the first connecting piece is located on the side of the first wall away from the electrode assembly.

[0033] In the above scheme, the first connecting piece is located on the outside of the first wall, on the one hand, facilitating assembly operation, so that the robot or other assembly equipment can efficiently fix the first electrode terminal to the first wall through the first connecting piece; on the other hand, the occupation of the internal space of the battery monomer by the first connecting piece can be reduced, so that the space utilization rate of the electrode assembly is high, thereby facilitating the improvement of the volumetric energy density of the battery monomer and the battery device.

[0034] According to some embodiments of the present application, the first connecting member is connected to the first wall, and a first groove is formed on the side of the first wall away from the electrode assembly along the thickness direction of the first wall, and the first groove is used to accommodate a portion of the first connecting member.

[0035] In the above solution, a first groove is provided on the outer side of the first wall to accommodate part of the first connector, so that the first connector can reasonably utilize the space in the thickness direction of the first wall to reduce the occupation of the external space by the first connector, which is beneficial to the control of the overall volume of the battery cell, thereby facilitating the improvement of the volume energy density of the battery cell, and further facilitating the improvement of the volume energy density of the battery device.

[0036] According to some embodiments of the present application, the first wall includes a first through hole, the first electrode terminal includes a first terminal body and a first flange, the first flange protrudes from the outer peripheral surface of the first terminal body, at least a portion of the first terminal body is disposed in the first through hole, and along the thickness direction of the first wall, at least a portion of the first flange is located between the first connecting member and the first wall.

[0037] In the above scheme, the first electrode terminal has a simple structure and is easy to manufacture. The first connecting member and the first wall constrain the first flange, which can limit the displacement of the first electrode terminal along the thickness direction of the first wall, thereby effectively fixing the first electrode terminal to the first wall and reducing the risk of separation between the first wall and the electrode terminal, thereby facilitating the improvement of the reliability of the battery cell and, in turn, the improvement of the reliability of the battery device.

[0038] According to some embodiments of the present application, the battery cell further includes a first sealant, at least a portion of which is disposed between the first terminal body and a hole wall of the first through hole.

[0039] In the above scheme, by arranging a first seal between the first terminal body and the hole wall of the first wall, on the one hand, the risk of electrolyte leakage from between the first terminal body and the hole wall of the first wall can be reduced, thereby improving the reliability of the battery cell; on the other hand, the first terminal body and the first wall can be insulated and isolated by the first seal, thereby reducing the risk of internal short circuit in the battery cell, thereby facilitating the improvement of the reliability of the battery cell.

[0040] According to some embodiments of the present application, the battery cell further includes a first insulating member, at least a portion of which is disposed between the first connecting member and the first electrode terminal.

[0041] In the above solution, by arranging a first insulating member between the first connecting member and the electrode terminal, the risk of the first electrode terminal being connected to the first outer wall through the first connecting member, causing an internal short circuit in the battery cell, can be reduced, thereby improving the reliability of the battery cell and further benefiting the reliability of the battery cell.

[0042] According to some embodiments of the present application, the first wall and the first connecting member are integrally formed.

[0043] In the above solution, by arranging the first wall and the first connecting member to be integrally formed, on the one hand, the structural strength of the first wall and the first connecting member can be increased, which is beneficial to improving the structural stability of the battery cell and making the reliability of the battery cell high; on the other hand, since the first wall and the first connecting member are an integral structure, the process of assembling parts can be reduced, the manufacturing rhythm of the battery cell can be improved, and the manufacturing efficiency of the battery cell can be improved.

[0044] According to some embodiments of the present application, the first wall has a first through hole, the first electrode terminal includes a first pole and a first conductive member, along the thickness direction of the first wall, the first conductive member is located on the side of the first wall away from the electrode assembly, a portion of the first pole is located on the side of the first wall facing the electrode assembly, and another portion of the first pole is passed through the through hole and connected to the first conductive member.

[0045] In the above solution, the first electrode terminal includes a first pole and a first conductive member. By connecting the first pole and the first conductive member to each other, the first electrode terminal can be firmly mounted on the first wall, thereby reducing the risk of separation between the first wall and the first electrode terminal, thereby making the battery cell have higher reliability, and further making the battery device have higher reliability.

[0046] According to some embodiments of the present application, the battery cell further includes a first sealant, at least a portion of which is disposed between the first electrode and a wall of the first through hole.

[0047] In the above scheme, by arranging a first seal between the first pole and the wall of the first through hole, on the one hand, the risk of electrolyte leakage from between the first pole and the wall of the first through hole can be reduced, thereby improving the reliability of the battery cell; on the other hand, the first pole and the first wall can be insulated and isolated by the first seal, thereby reducing the risk of internal short circuit in the battery cell, thereby facilitating the improvement of the reliability of the battery cell.

[0048] According to some embodiments of the present application, the battery cell further includes a first insulating member, at least a portion of which is disposed between the first wall and the first conductive member.

[0049] In the above solution, by arranging the first insulating member between the first wall and the first conductive member, the risk of the first electrode terminal being connected to the first wall shell and causing an internal short circuit in the battery cell can be reduced, thereby improving the reliability of the battery cell and further facilitating the reliability of the battery cell.

[0050] In a second aspect, some embodiments of the present application further provide a battery device comprising the battery cell provided in the first aspect.

[0051] In a third aspect, some embodiments of the present application further provide a power utilization device, comprising the battery cell provided in the first aspect and / or the battery device provided in the second aspect, the battery cell being configured to provide electric energy.

[0052] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0054] Figure 1 A structural schematic diagram of a vehicle in some embodiments of the present application;

[0055] Figure 2 A perspective exploded view of a battery device in some embodiments of the present application;

[0056] Figure 3 A perspective exploded view of a battery cell in some embodiments of the present application;

[0057] Figure 4 A structural schematic diagram of a first wall and an electrode terminal in some embodiments of the present application;

[0058] Figure 5 A structural schematic diagram of a first wall, an electrode terminal and a first connecting member in some embodiments of the present application;

[0059] Figure 6 A perspective exploded view of a first wall and an electrode terminal in some embodiments of the present application;

[0060] Figure 7 A structural schematic diagram of an internal structure of a first wall and a first electrode terminal in some embodiments of the present application;

[0061] Figure 8 A perspective exploded view of a first wall and an electrode terminal in some other embodiments of the present application;

[0062] Figure 9 A structural schematic diagram of a first wall and an electrode terminal in some other embodiments of the present application;

[0063] Figure 10 A perspective exploded view of a first wall and an electrode terminal in some other embodiments of the present application;

[0064] Figure 11Schematic diagram of the internal structure of the first wall and the first electrode terminal in some other embodiments of the present application.

[0065] Icons: 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-battery cell; 20-housing; 21-first housing portion; 22-second housing portion; 11-housing; 110-first wall; 111-housing; 1100-first through hole; 1101-second through hole; 1102-first groove; 1103-second groove; 12-electrode assembly; 120-first adapter; 121-second adapter; 13-electrode terminal; 14-first electrode terminal; 140- First terminal body; 141-first flange; 142-first pole; 1420-columnar body; 1421-plate base; 143-first conductive member; 15-second electrode terminal; 150-second pole; 151-second conductive member; 16-first connecting member; 160-first connecting section; 161-second connecting section; 162-third connecting section; 17-second connecting member; 18-first sealing member; 18a-second sealing member; 19-first insulating member; z-thickness direction of the first wall; x-first direction. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0072] The term "plurality" used in this application refers to two or more (including two).

[0073] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0074] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0075] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0076] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0077] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0078] In some embodiments, the electrode assembly further comprises a separator disposed between the positive electrode and the negative electrode.

[0079] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film with good chemical stability and mechanical stability can be used.

[0080] In some embodiments, the battery cell further comprises an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The electrolyte can be in a liquid state, a gel state, or a solid state. In some embodiments, the electrolyte can be an electrolytic solution.

[0081] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0082] In some embodiments, the electrode assembly is in a stack structure.

[0083] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0084] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked, and one positive electrode sheet is sandwiched between adjacent folded segments.

[0085] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are stacked.

[0086] As an example, a plurality of separators can be provided, and each of the plurality of separators is disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0087] As an example, the separators can be continuously provided, and are disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0088] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0089] In some embodiments, the electrode assembly is provided with a tab, which can lead current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0090] In some embodiments, the battery cell can comprise a housing. The housing is used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0091] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0092] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0093] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0094] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0095] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0096] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0097] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0098] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0099] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0100] In some embodiments, the battery device can refer to an energy storage device, which includes a box body, at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0101] For example, the battery device includes a beam assembly and a battery monomer assembly. The beam assembly can include a mounting beam and a hanging beam arranged with each other. The mounting beam is used to mount and fix the battery monomer assembly, and the hanging beam is used to hang the battery on the body of the power utilization device to supply power to the body of the power utilization device. In some embodiments, the beam assembly can be a partial structural member of the box body.

[0102] The battery device has the advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, small self-discharge coefficient, etc., and is an important part of the development of new energy today. The development of battery technology needs to consider many design factors, such as cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the energy density and reliability of the battery device also need to be considered.

[0103] In the battery monomer technology, the battery monomer includes a shell, an electrode assembly, and an electrode terminal. The electrode terminal is electrically connected with the electrode assembly to realize the input and output of electric energy. The electrode terminal can include first and second electrode terminals with opposite polarities, such as positive and negative electrode terminals. In the related art, the positive and negative electrode terminals can be respectively mounted on a first wall of the shell. To mount the positive and negative electrode terminals, corresponding through holes are usually arranged on the first wall. In the related art, to improve the volumetric energy density of the battery, the first wall can be made of steel with high structural strength, and the thickness of the first wall can be made thin, for example, the thickness of the first wall is 0.2-1.5 mm.

[0104] However, under the condition that the through holes are arranged on the first wall to mount the electrode terminals, the thickness of the first wall is set to be thin, which will affect the structural strength of the first wall. With the increase of the number of charge-discharge cycles of the battery, the first wall is deformed by the internal expansion force of the battery monomer, and the separation between the electrode terminal and the first wall or the disconnection of the circuit between the electrode terminal and the electrode assembly is caused due to the low structural strength of the first wall, which increases the risk of the battery monomer and the battery device.

[0105] In view of this, in order to improve the problem of low reliability of the battery cell caused by the low structural strength of the first wall, some embodiments of the present application provide a battery cell, which includes a shell, an electrode assembly, and a first electrode terminal and a second electrode terminal with opposite polarities. The shell has a first wall, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly is arranged in the shell. Along the first direction, the first electrode terminal and the second electrode terminal are spaced apart on the first wall, and the first electrode terminal and the second electrode terminal are electrically connected to the electrode assembly respectively, and the first direction is the length direction of the first wall. Wherein, along the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, and the length of the first wall is b, which satisfies 40%≤a / b≤90%.

[0106] In the above scheme, on the one hand, the thickness of the first wall of the shell is set to be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall is relatively thin, which can reduce the impact of the thickness of the shell on the volume of the battery cell, improve the space utilization of the electrode assembly, and thus facilitate the improvement of the volume energy density of the battery cell; on the other hand, by arranging the first electrode terminal and the second electrode terminal of opposite polarity on the same wall portion, the electrode terminal has a single-sided tab, which can effectively improve the space utilization of the electrode assembly compared to the scheme with double-sided tabs, thereby facilitating the improvement of the volume energy density of the battery cell; on the other hand, under the condition of the limited range of the first wall thickness, after multiple tests and comparisons, by limiting the center distance between the first electrode terminal and the second electrode terminal so that the center distance is greater than or equal to 50% and less than or equal to 90% of the length of the first wall, the deformation resistance under the condition of a thinner first wall can be effectively improved, thereby reducing the risk of the internal expansion force of the battery cell impacting the first wall and causing the circuit between the electrode terminal and the electrode assembly to be disconnected, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0107] The battery devices disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery devices disclosed in this application can be used to alleviate the problem of short circuits in the battery devices during use, thereby improving the reliability of the battery devices. It can also help increase the volumetric energy density of the battery devices and extend the operating time of the electrical devices.

[0108] The present invention provides an electrical device that uses a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0109] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0110] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the vehicle in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 can be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0111] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0112] See Figure 2 , Figure 2 1 is an exploded perspective view of the battery device 100 in some embodiments of the present application.

[0113] The battery device 100 includes a battery cell 10 and a housing 20, with the battery cell 10 housed within the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 can have various structures. In some embodiments, the housing 20 can include a first housing portion 21 and a second housing portion 22, which cover each other and together define a storage space for the battery cell 10. The second housing portion 22 can be a hollow structure with one end open, and the first housing portion 21 can be a plate-like structure, with the first housing portion 21 covering the open side of the second housing portion 22, so that the first housing portion 21 and the second housing portion 22 together define a storage space. The first housing portion 21 and the second housing portion 22 can also be hollow structures with one end open, with the open side of the first housing portion 21 covering the open side of the second housing portion 22. Of course, the box body 20 formed by the first box body portion 21 and the second box body portion 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0114] In the battery, there may be one or more battery cells 10 , and each battery cell 10 may be fixed to the case 20 by a connector (such as a bolt), or each battery cell 10 may be fixed to the case 20 by bonding.

[0115] In some embodiments, the battery cells 10 in the housing 20 can be electrically connected via a busbar, allowing the battery cells 10 in the housing 20 to be connected in series, in parallel, or in mixed series. For example, the housing 20 includes multiple battery cell assemblies, each of which includes multiple stacked battery cells 10, and the multiple battery cells 10 are connected in series via a busbar. In some embodiments, the multiple battery cell assemblies can be connected in series via a busbar.

[0116] According to some embodiments of the present application, a battery cell 10 is provided. Figure 3 and Figure 4 , Figure 3 This is a three-dimensional exploded view of a battery cell 10 in some embodiments of the present application. Figure 4 Schematic diagram of the structure of the first wall 110 and the electrode terminal 13 in some embodiments of the present application.

[0117] The battery cell 10 includes a housing 11, an electrode assembly 12, and a first electrode terminal 14 and a second electrode terminal 15 with opposite polarities. The housing 11 has a first wall 110, and the thickness of the first wall 110 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly 12 is disposed in the housing 11. Along the first direction x, the first electrode terminal 14 and the second electrode terminal 15 are spaced apart from each other on the first wall 110. The first electrode terminal 14 and the second electrode terminal 15 are electrically connected to the electrode assembly 12, respectively. The first direction x is the length direction of the first wall 110. Among them, along the first direction x, the center distance between the first electrode terminal 14 and the second electrode terminal 15 is a, and the length of the first wall 110 is b, satisfying 40%≤a / b≤94.4%.

[0118] In some embodiments, the battery cell 10 includes a housing 11 and an electrode assembly 12. The electrode assembly 12 and the electrolyte can be enclosed in the enclosed space of the housing 11. In some embodiments, the number of electrode assemblies 12 can be one or more. Figure 3 The battery cell 10 includes two electrode assemblies 12 , which are stacked in a housing 111 .

[0119] In some embodiments, the housing 11 may be made of a metal material, such as aluminum, steel, or a composite metal. In some embodiments, the materials of the different wall portions of the housing 11 may be the same or different. For example, the housing 11 may include a shell 111 and an end cap. The shell 111 has a first opening. The electrode assembly 12 may be placed in the shell 111 through the first opening. The end cap may cover the first opening of the shell 111 so that the electrode assembly 12 is located in a closed space. The end cap may be made of one metal material, and the shell 111 may be made of another metal material. The end cap and the shell 111 may be made of the same metal material.

[0120] In some embodiments, the housing 11 may be a square housing, a cylindrical housing, or a polygonal prism housing. In some embodiments of the present application, the housing 11 is illustrated as a square housing.

[0121] The shell 11 has a first wall 110, which is one of the different wall portions of the shell 11. Optionally, the first wall 110 can be an end cover of the shell 11; or the first wall 110 can also be a wall portion of other parts of the shell 11, for example, the first wall 110 is the bottom wall or side wall of the shell 11.

[0122] The first wall 110 may be mounted with an electrode terminal 13 for electrically connecting to the electrode assembly 12 to enable input or output of electrical energy. For example, one end of the electrode terminal 13 is electrically connected to the electrode assembly 12 and the other end is electrically connected to an external busbar.

[0123] The electrode terminals 13 include a first electrode terminal 14 and a second electrode terminal 15. The first electrode terminal 14 and the second electrode terminal 15 have opposite polarities, one of which is a positive electrode terminal 13 and the other is a negative electrode terminal 13. Taking the example of the first electrode terminal 14 corresponding to the positive electrode and the second electrode terminal 15 corresponding to the negative electrode, the end of the first electrode terminal 14 located inside the housing 11 is electrically connected to the positive electrode tab of the electrode assembly 12. The two can be connected directly or indirectly. For example, the first electrode terminal 14 is connected to the positive electrode tab through a first adapter 120, and the end of the first electrode terminal 14 located outside the housing 11 is connected to an external current collector. The second electrode terminal 15 is electrically connected to the negative electrode tab of the electrode assembly 12 at one end inside the housing 11. The two can be connected directly or indirectly. For example, the second electrode terminal 15 is connected to the negative electrode tab through a second adapter 121, and the end of the second electrode terminal 15 located outside the housing 11 is connected to an external current collector.

[0124] In some embodiments, the electrode terminal 13 is made of a metal material, such as aluminum, copper, iron, steel, an alloy, or a composite metal.

[0125] In some embodiments, a first through hole 1100 and a second through hole 1101 are provided on the first wall 110. The first through hole 1100 and the second through hole 1101 correspond to the first electrode terminal 14 and the second electrode terminal 15, respectively. The first through hole 1100 and the second through hole 1101 penetrate the first wall 110 along the thickness direction z of the first wall. For example, the first electrode terminal 14 passes through the first through hole 1100 so that a portion located on the inner side of the first wall 110 can be electrically connected to the electrode assembly 12, and a portion located on the outer side of the first wall 110 can be electrically connected to an external busbar component.

[0126] In some embodiments, the connection relationship between the electrode terminal 13 and the first wall 110 is diverse. The electrode terminal 13 and the first wall 110 can be directly or indirectly connected, and the connection forms include but are not limited to riveting, welding, bonding, or screw connection. For example, taking the connection relationship between the first electrode terminal 14 and the first wall 110 as an example, the first electrode terminal 14 includes a first conductive member 143 and a first pole 142. A portion of the first pole 142 is located on the inner side of the first wall 110 to electrically connect to the electrode assembly 12. Another portion of the first pole 142 passes through the first through hole 1100 and is riveted to the first conductive member 143. The first conductive member 143 is located on the outer side of the first wall 110 and can be used to electrically connect to an external busbar component. Alternatively, illustratively, the first electrode terminal 14 passes through the first through hole 1100 and is fixed to the first wall 110 by the first connecting member 16. For example, the first connecting member 16 includes a welding ring, which is along the circumference of the first electrode terminal 14. The welding ring presses the first electrode terminal 14 onto the first wall 110 and is welded to the first wall 110. An insulating structure can be provided between the welding ring and the first electrode terminal 14 to insulate and isolate the first electrode terminal 14 and the welding ring.

[0127] Optionally, the first wall 110 may be an integral structure with other wall portions of the housing 11 , for example, the first wall 110 and other wall portions of the housing 11 may be integrally formed.

[0128] Optionally, the first wall 110 and other walls of the housing 11 are separate structures. For example, the first wall 110 is an end cap, which is connected to the housing 111 and closes the first opening of the housing 111. Taking the first wall 110 as an end cap as an example, the electrode terminal 13 is mounted on the first wall 110, and the first wall 110 can be directly or indirectly connected to the housing 111 to close the first opening of the housing 111. The connection relationship between the first wall 110 and the housing 111 is diverse, for example, the connection relationship between the first wall 110 and the housing 111 includes but is not limited to welding, bonding, riveting, or screw connection.

[0129] In some embodiments provided in the present application, the material of the first wall 110 is steel, and the thickness of the first wall 110 can be greater than or equal to 0.2 mm and less than or equal to 1.5 mm. For example, the thickness of the first wall 110 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or any value between two adjacent values.

[0130] In some embodiments, the larger the volume of the battery cell 10 , the larger the thickness of the first wall 110 may be, and the smaller the volume of the battery cell 10 , the smaller the thickness of the first wall 110 may be.

[0131] In some embodiments, the first direction x may be the length direction of the first wall 110 . The length direction of the first wall 110 may be understood as follows: the outer contour of the first wall 110 may be a rectangle, and the length direction is the direction in which the first wall 110 has the largest size.

[0132] “Along the first direction x, the first electrode terminal 14 and the second electrode terminal 15 are spaced apart on the first wall 110 ” can be understood as the first electrode terminal 14 and the second electrode terminal 15 are spaced apart in the first direction x, with a distance therebetween to reduce the risk of short circuit between the positive and negative electrodes.

[0133] The "center distance between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x" can be understood as the distance between the central axis of the first electrode terminal 14 and the central axis of the second electrode terminal 15 in the first direction x. The central axis of the first electrode terminal 14 and the central axis of the second electrode terminal 15 can be parallel to the thickness direction z of the first wall.

[0134] In some embodiments, a / b can be understood as the ratio of the center distance a between the first electrode terminal 14 and the second electrode terminal 15 to the length b of the first wall 110 along the first direction x. The value of a / b can be greater than or equal to 40% and less than or equal to 90%. For example, the value of a / b can be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%...80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90% or any value between two adjacent values.

[0135] Optionally, the value of a / b may be greater than or equal to 50%, or less than or equal to 90%, that is, the value of a / b may be 50%, 90%, or any value between the two values.

[0136] Optionally, the value of a / b may be greater than or equal to 50%, or less than or equal to 85%, that is, the value of a / b may be 50%, 85%, or any value between the two values.

[0137] Optionally, the value of a / b may be greater than or equal to 50%, or less than or equal to 82%, that is, the value of a / b may be 50%, 82%, or any value between the two values.

[0138] Optionally, the value of a / b may be greater than or equal to 50%, or less than or equal to 79%, that is, the value of a / b may be 50%, 79%, or any value between the two values.

[0139] Optionally, the value of a / b may be greater than or equal to 50%, or less than or equal to 75%, that is, the value of a / b may be 50%, 75%, or any value between the two values.

[0140] In some embodiments, the length of the first wall 110 may be measured by a laser ranging method, a direct ranging method, a projection ranging method, or the like.

[0141] In some embodiments, the measurement method of "the center distance between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x" can include laser ranging method, direct method or projection ranging method and other methods.

[0142] In the above scheme, on the one hand, the thickness of the first wall 110 of the shell 11 is set to be greater than or equal to 0.2 mm and less than or equal to 1.5 mm, so that the thickness of the first wall 110 is thinner, which can reduce the influence of the thickness of the shell 11 on the volume of the battery cell 10, and can improve the space utilization rate of the electrode assembly 12, thereby facilitating the improvement of the volume energy density of the battery cell 10; on the other hand, by arranging the first electrode terminal 14 and the second electrode terminal 15 with opposite polarities on the same wall portion, so that the electrode terminal 13 has a single-sided tab, compared with the double-sided tab scheme, it can effectively improve the space utilization rate of the electrode assembly 12, thereby facilitating the improvement of the volume energy density of the battery cell 10. The volume energy density of the single cell 10 is improved; on the other hand, under the condition of the limited range of the thickness of the first wall 110, after multiple tests and comparisons, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15, so that the center distance is greater than or equal to 40% and less than or equal to 90% of the length of the first wall 110, the deformation resistance under the condition of thinner thickness of the first wall 110 can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery single cell 10 on the first wall 110, thereby improving the reliability of the battery single cell 10, and then improving the reliability of the battery device 100.

[0143] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 170 mm and less than 210 mm, and along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 105 mm and less than or equal to 160 mm.

[0144] In some embodiments, the length of the first wall 110 of some battery cells 10 is greater than or equal to 170 mm and less than 210 mm. For example, the length b of the first wall 110 is 170 mm, 171 mm, 172 mm, 173 mm, 174 mm, 175 mm, 176 mm, 177 mm, 178 mm, 179 mm, 180 mm, ... 208 mm, 209 mm, or a value less than 210 mm, or any value between two adjacent values. In some battery cells 10 of these specifications, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be greater than or equal to 105 mm and less than or equal to 160 mm. For example, the value of a can be 105 mm, 106 mm, 107 mm, 108 mm, 109 mm, 110 mm, ... 156 mm, 157 mm, 158 mm, 159 mm, 160 mm, or any value between two adjacent values.

[0145] For example, in some battery cells 10 with a first wall 110 having a length of 188 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 155 mm.

[0146] In the above scheme, in some battery cells 10 where the length of the first wall 110 is greater than or equal to 170 mm and less than 210 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 to a value greater than or equal to 105 mm and less than or equal to 160 mm, the deformation resistance under the conditions of the thinner thickness of the first wall 110 and the length of the first wall 110 being greater than or equal to 170 mm and less than 210 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery cell 10 on the first wall 110, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery device 100.

[0147] According to some embodiments of the present application, the length b of the first wall is greater than or equal to 170 mm and less than 210 mm, satisfying 50%≤a / b≤85%.

[0148] In some embodiments, the length of the first wall 110 of some specifications of the battery cell 10 is greater than or equal to 170 mm and less than 210 mm. For example, the length b of the first wall 110 is 170 mm, 171 mm, 172 mm, 173 mm, 174 mm, 175 mm, 176 mm, 177 mm, 178 mm, 179 mm, 180 mm, ... 208 mm, 209 mm, or a value less than 210 mm, or any value between two adjacent values. In some specifications of the battery cell 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x to the length b of the first wall 110 can be 50%, 51%, 52%, 53%, 54% ... 81%, 82%, 83%, 84%, 85%, or any value between two adjacent values.

[0149] For example, in some battery cells 10 with a specification in which the length b of the first wall 110 is 177 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 may be 135 mm.

[0150] For example, in some battery cells 10 with a specification in which the length b of the first wall 110 is 170 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 may be 120 mm.

[0151] In the above scheme, in some battery cells where the length of the first wall 110 is greater than or equal to 177 mm and less than 210 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the ratio of the center distance to the length of the first wall 110 is greater than or equal to 50.4% and less than or equal to 76.2%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 177 mm and less than 210 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0152] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, and along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 120 mm and less than or equal to 190 mm.

[0153] In some embodiments, the length of the first wall 110 of some battery cells 10 is greater than or equal to 210 mm and less than 240 mm. For example, the length b of the first wall 110 is 210 mm, 211 mm, 212 mm, 213 mm, ..., 238 mm, 239 mm, or a value less than 240 mm, or any value between two adjacent values. In some battery cells 10 of these specifications, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be greater than or equal to 120 mm and less than or equal to 190 mm. For example, the value of a can be 120 mm, 121 mm, 122 mm, 123 mm, 124 mm, 125 mm, 126 mm, 127 mm, 128 mm, 129 mm, ..., 190 mm, or any value between two adjacent values.

[0154] For example, in some battery cells 10 with a first wall 110 having a length of 220 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 188 mm.

[0155] For example, in some battery cells 10 with a first wall 110 having a length of 210 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 150 mm.

[0156] In the above scheme, in some battery cells 10 where the length of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 to a value greater than or equal to 120 mm and less than or equal to 190 mm, the deformation resistance under the conditions of the thinner thickness of the first wall 110 and the length of the first wall 110 being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery cell 10 on the first wall 110, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery device 100.

[0157] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, satisfying 56.2%≤a / b≤80.9%.

[0158] In some embodiments, the length of the first wall 110 of some battery cell specifications 10 is greater than or equal to 210 mm and less than 240 mm. For example, the length b of the first wall 110 is 210 mm, 211 mm, 212 mm, 213 mm, ... 238 mm, 239 mm, or a value less than 240 mm, or any value between two adjacent values. In some battery cell specifications 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x to the length b of the first wall 110 can be 50%, 51%, 52%, 53%, 54% ... 81%, 82%, or any value between two adjacent values.

[0159] In the above scheme, in some battery cells where the length of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the ratio of the center distance to the length of the first wall 110 is greater than or equal to 50% and less than or equal to 82%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 210 mm and less than 240 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0160] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, and along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 135 mm and less than or equal to 213 mm.

[0161] In some embodiments, the length of the first wall 110 of some battery cells 10 is greater than or equal to 240 mm and less than 270 mm. For example, the length b of the first wall 110 is 240 mm, 241 mm, 242 mm, 243 mm, ... 268 mm, 269 mm, or a value less than 270 mm, or any value between two adjacent values. In some battery cells 10 of these specifications, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be greater than or equal to 135 mm and less than or equal to 213 mm. For example, the value of a can be 135 mm, 136 mm, 137 mm, 138 mm, 139 mm, ... 209 mm, 210 mm, 211 mm, 212 mm, 213 mm, or any value between two adjacent values.

[0162] For example, in some battery cells 10 with a first wall 110 having a length of 240 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 190 mm.

[0163] In the above scheme, in some battery cells 10 where the length of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the center distance is greater than or equal to 135 mm and less than or equal to 213 mm, the deformation resistance under the conditions of thinner thickness of the first wall 110 and the length of the first wall 110 being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery cell 10 on the first wall 110, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery device 100.

[0164] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, satisfying 50%≤a / b≤79%.

[0165] In some embodiments, the length of the first wall 110 of some battery cell specifications 10 is greater than or equal to 240 mm and less than 270 mm. For example, the length b of the first wall 110 is 240 mm, 241 mm, 242 mm, 243 mm, ... 268 mm, 269 mm, or a value less than 270 mm, or any value between two adjacent values. In these battery cell specifications 10, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 along the first direction x to the length b of the first wall 110 can be 50%, 51%, 52%, 53%, 54% ... 77%, 78%, 79%, or any value between two adjacent values.

[0166] For example, in some battery cells 10 with a first wall 110 having a length of 240 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 190 mm.

[0167] In the above scheme, in some battery cells where the length of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the ratio of the center distance to the length of the first wall 110 is greater than or equal to 50% and less than or equal to 79%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 240 mm and less than 270 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0168] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, and along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 170 mm and less than or equal to 230 mm.

[0169] In some embodiments, the length of the first wall 110 of some specifications of the battery cell 10 is greater than or equal to 270 mm and less than or equal to 320 mm. For example, the length b of the first wall 110 is 270 mm, 271 mm, 272 mm, 273 mm, ... 318 mm, 319 mm, 320 mm, or any value between two adjacent values. In some specifications of the battery cell 10, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x can be greater than or equal to 170 mm and less than or equal to 230 mm. For example, the value of a can be 170 mm, 171 mm, 172 mm, 173 mm, 174 mm, ... 209 mm, 227 mm, 228 mm, 229 mm, 230 mm, or any value between two adjacent values.

[0170] For example, in some battery cells 10 with a first wall 110 having a length of 280 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 210 mm.

[0171] In the above scheme, in some battery cells 10 where the length of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the center distance is greater than or equal to 170 mm and less than or equal to 230 mm, the anti-deformation ability under the conditions of thinner thickness of the first wall 110 and the length of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal 13 and the electrode assembly 12 being disconnected due to the impact of the internal expansion force of the battery cell 10 on the first wall 110, thereby improving the reliability of the battery cell 10 and further improving the reliability of the battery device 100.

[0172] According to some embodiments of the present application, the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, satisfying 50%≤a / b≤75%.

[0173] In some embodiments, the length of the first wall 110 of some battery cells 10 is greater than or equal to 270 mm and less than or equal to 320 mm. For example, the length b of the first wall 110 is 270 mm, 271 mm, 272 mm, 273 mm, ... 318 mm, 319 mm, 320 mm, or any value between two adjacent values. In these battery cells 10, along the first direction x, the ratio a / b between the center distance a of the first electrode terminal 14 and the second electrode terminal 15 to the length b of the first wall 110 can be 50%, 51%, 52%, 53%, 54% ... 71%, 72%, 73%, 74%, 75%, or any value between two adjacent values.

[0174] For example, in some battery cells 10 with a first wall 110 having a length of 270 mm, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 along the first direction x may be 190 mm.

[0175] In the above scheme, in some battery cells where the length of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, by limiting the center distance between the first electrode terminal 14 and the second electrode terminal 15 so that the ratio of the center distance to the length of the first wall 110 is greater than or equal to 50% and less than or equal to 75%, the deformation resistance under the conditions of thinner thickness of the first wall and the length of the first wall being greater than or equal to 270 mm and less than or equal to 320 mm can be effectively improved, thereby reducing the risk of the circuit between the electrode terminal and the electrode assembly being disconnected due to the impact of the internal expansion force of the battery cell on the first wall, thereby improving the reliability of the battery cell and further improving the reliability of the battery device.

[0176] According to some embodiments of the present application, the thickness of the first wall 110 is greater than or equal to 0.5 mm and less than or equal to 1.3 mm.

[0177] In some embodiments, the material of the first wall 110 is steel, and the thickness of the first wall 110 can be greater than or equal to 0.5 mm and less than or 1.3 mm. For example, the thickness of the first wall 110 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm or any value between two adjacent values.

[0178] In the above solution, by setting the material of the first wall 110 to steel with greater structural strength, on the one hand, the anti-expansion ability of the shell 11 can be improved, and on the other hand, the thickness of the first wall 110 can be further reduced, so that the space utilization of the battery cell 10 is improved, thereby making the volume energy density of the battery cell 10 high, and further making the volume energy density of the battery device 100 high.

[0179] According to some embodiments of this application, see Figure 3 The housing 11 includes a shell 111 and an end cover. The shell 111 has a first opening. The end cover is connected to the shell 111 and closes the first opening. The first wall 110 is the end cover. The thickness of the first wall 110 is greater than that of the shell 111.

[0180] In some embodiments, the housing 11 includes a separate shell 111 and an end cap. The shell 111 has a first opening, and the electrode assembly 12 can be placed into the shell 111 through the first opening. The end cap is connected to the shell 111 and closes the first opening. The end cap can be a first wall 110, and the first wall 110 can be connected to the shell 111 by welding or other connection relationships.

[0181] In some embodiments, the first wall 110 and the shell 111 are made of the same material. For example, the first wall 110 and the shell 111 are respectively made of steel. The thickness of the first wall 110 may be greater than the thickness of the shell 111 .

[0182] In some embodiments, the first wall 110 and the shell 111 may be made of different materials. For example, the first wall 110 may be made of aluminum and the shell 111 may be made of steel. The thickness of the first wall 110 may be greater than the thickness of the shell 111 .

[0183] In the above scheme, by setting the thickness of the first wall 110 to be greater than the thickness of the shell 111, on the one hand, the structural strength lost due to the opening of the first wall 110 to set the electrode terminal 13 can be compensated, so that the reliability of the battery cell 10 is high. On the other hand, the thickness of the shell 111 can be made thinner, which can improve the space utilization of the electrode assembly 12, thereby facilitating the improvement of the volume energy density of the battery cell 10, and further facilitating the improvement of the volume energy density of the battery device 100.

[0184] According to some embodiments of the present application, the shell 111 is made of steel, and the thickness of the shell 111 is not less than 0.075 mm and not more than 0.35 mm.

[0185] In some embodiments, the shell 111 is made of steel, and the thickness of the shell 111 can be 0.075 mm, 0.080 mm, 0.085 mm, 0.090 mm, 0.095 mm, 0.1 mm…0.340 mm, 0.345 mm, 0.35 mm or any value between two adjacent values.

[0186] In the above solution, by setting the material of the shell 111 to steel with greater structural strength, on the one hand, the anti-expansion ability of the shell 11 can be improved, and on the other hand, the thickness of the shell 111 can be further reduced, so that the space utilization of the battery cell 10 is improved, thereby making the volume energy density of the battery cell 10 high, and further making the volume energy density of the battery device 100 high.

[0187] According to some embodiments of the present application, the thickness of the housing 111 is not less than 0.15 mm and not more than 0.25 mm.

[0188] In some embodiments, the shell 111 is made of steel, and the thickness of the shell 111 can be no less than 0.15 mm and no more than 0.25 mm. For example, the thickness of the shell 111 can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm or any value between two adjacent values.

[0189] In the above solution, by setting the material of the shell 111 to steel with greater structural strength, on the one hand, the anti-expansion ability of the shell 11 can be improved, and on the other hand, the thickness of the shell 111 can be further reduced, so that the space utilization of the battery cell 10 is improved, thereby making the volume energy density of the battery cell 10 high, and further making the volume energy density of the battery device 100 high.

[0190] According to some embodiments of this application, see Figure 5-Figure 7 , Figure 5 This is a structural diagram of the first wall 110, the electrode terminal 13, and the first connecting member 16 in some embodiments of the present application. Figure 6 This is a three-dimensional exploded view of the first wall 110, the electrode terminal 13, and the first connecting member 16 in some embodiments of the present application. Figure 7 Schematic diagram of the internal structure of the first wall 110 , the first connecting member 16 and the first electrode terminal 14 in some embodiments of the present application.

[0191] The battery cell 10 further includes a first connector 16 . The first connector 16 is at least partially disposed on the periphery of the first electrode terminal 14 . The first connector 16 is used to fix the first electrode terminal 14 to the first wall 110 .

[0192] In some embodiments, the first electrode terminal 14 is secured by a first connector 16. The first connector 16 can be connected to the first wall 110 to positionally secure the first electrode terminal 14 to the first wall 110. For example, a first through-hole 1100 is formed in the first wall 110, through which the first electrode terminal 14 passes. The first connector 16 is connected to the first wall 110, and the first connecting portion presses the first electrode terminal 14 against the first wall 110 to restrict the position of the first electrode terminal 14 in the thickness direction z of the first wall.

[0193] “The first connecting member 16 is at least partially arranged on the outer periphery of the first electrode terminal 14” can be understood as that the first connecting member 16 is arranged along the circumference of the first electrode terminal 14 to fix the first electrode terminal 14 to the first wall 110 in the circumferential direction of the first electrode terminal 14. Optionally, the first connecting member 16 can be annular, the inner periphery of the first connecting member 16 can act on the first electrode terminal 14, and the outer periphery can be connected to the first wall 110.

[0194] In some embodiments, along the thickness direction z of the first wall, the first connecting member 16 can be disposed on the outside or inside of the first wall 110. Figure 7 The first connecting member 16 includes a first connecting segment 160, a second connecting segment 161 and a third connecting segment 162. The first connecting segment 160 is connected to the outer side surface of the first wall 110, and the third connecting segment 162 is connected to the first connecting segment 160 through the second connecting segment 161. The third connecting segment 162 is bent compared to the first connecting segment 160 to clamp a portion of the first electrode terminal 14 together with the first wall 110, thereby limiting the first electrode terminal 14 from falling out of the first through hole 1100.

[0195] In some embodiments, the first connecting member 16 may be made of metal, such as aluminum, steel, or composite metal. In other embodiments, the first connecting member 16 may be made of non-metallic material, such as plastic.

[0196] In some embodiments, the first connector 16 and the first wall 110 can be separate structures, connected by welding, bonding, riveting, or screw connection. In other embodiments, the first connector 16 and the first wall 110 can be an integrally formed structure. For example, when the first electrode terminal 14 is not assembled, the first connector 16 can be protruded from the outer side of the first wall 110 and bent to form a third connecting section 162 to secure the first electrode terminal 14.

[0197] In the above scheme, by arranging the first connecting member 16 on the periphery of the first electrode terminal 14, on the one hand, the first electrode terminal 14 can be effectively fixed to the first wall 110, reducing the risk of the first electrode terminal 14 being separated from the first wall 110 and causing the internal circuit of the battery cell 10 to be disconnected, so that the battery cell 10 has high reliability; on the other hand, by fixing the first electrode terminal 14 to the first wall 110 through the first connecting member 16, the difficulty of assembling the battery cell 10 can be effectively reduced, and the assembly rhythm of the first electrode terminal 14 can be improved, thereby facilitating the improvement of the manufacturing efficiency of the battery cell 10.

[0198] In some embodiments, the second electrode terminal 15 may also be fixed to the first wall 110 via a second connecting member 17. The structure of the second connecting member 17 is similar to that of the first connecting member 16 described above. For example, the first wall 110 has a second through-hole 1101, the second electrode terminal 15 is passed through the second through-hole 1101, and the second connecting member 17 is connected to the first wall 110. The second connecting portion presses the second electrode terminal 15 against the first wall 110 to limit the position of the second electrode terminal 15 in the thickness direction z of the first wall.

[0199] According to some embodiments of the present application, along the thickness direction z of the first wall, the first connecting member 16 is located on a side of the first wall 110 away from the electrode assembly 12 .

[0200] The outer side of the first wall 110 may be along the thickness direction z of the first wall, and the first wall 110 is away from the electrode assembly 12. In some embodiments, the first connector 16 may be located outside the first wall 110 so as not to occupy space inside the housing 11.

[0201] In the above scheme, the first connecting member 16 is located on the outside of the first wall 110. On the one hand, it is convenient for assembly operation, so that a robot or other assembly equipment can efficiently fix the first electrode terminal 14 to the first wall 110 through the first connecting member 16; on the other hand, it can reduce the occupation of the internal space of the battery cell 10 by the first connecting member 16, thereby making the space utilization rate of the electrode assembly 12 high, and further facilitating the improvement of the volume energy density of the battery cell 10 and the battery device 100.

[0202] According to some embodiments of the present application, the first connecting member 16 is connected to the first wall 110 , and a first groove 1102 is formed on the side of the first wall 110 facing away from the electrode assembly 12 along the thickness direction z of the first wall, and the first groove 1102 is used to accommodate a portion of the first connecting member 16 .

[0203] See Figure 6 The first connector 16 and the first wall 110 are separate structures, and the first connector 16 is disposed on the outside of the first wall 110. In some embodiments, a first groove 1102 is formed on the outer side of the first wall 110. The shape of the first groove 1102 can correspond to the shape of the first connector 16. Optionally, the first connector 16 is annular, and the first groove 1102 can be an annular groove and disposed around the first through hole 1100. A portion of the first connector 16 can be located in the first groove 1102 and welded to the bottom wall and / or sidewalls of the first groove 1102.

[0204] Alternatively, see Figure 6 A second groove 1103 is formed on the outer side of the first wall 110. The shape of the second groove 1103 may correspond to the shape of the second connecting member 17. Optionally, the second connecting member 17 is annular, and the second groove 1103 may be an annular groove disposed around the second through hole 1101. A portion of the second connecting member 17 may be located in the second groove 1103 and welded to the bottom wall and / or sidewalls of the second groove 1103.

[0205] In the above scheme, a first groove 1102 is provided on the outer side of the first wall 110 to accommodate a portion of the first connector 16, so that the first connector 16 can reasonably utilize the space in the thickness direction z of the first wall to reduce the occupation of the external space by the first connector 16, which is beneficial to the control of the overall volume of the battery cell 10, thereby facilitating the improvement of the volume energy density of the battery cell 10, and further facilitating the improvement of the volume energy density of the battery device 100.

[0206] According to some embodiments of this application, see Figure 6 and Figure 7 The first wall 110 includes a first through hole 1100, the first electrode terminal 14 includes a first terminal body 140 and a first flange 141, the first flange 141 protrudes from the outer peripheral surface of the first terminal body 140, at least a portion of the first terminal body 140 is arranged in the first through hole 1100, and along the thickness direction z of the first wall, at least a portion of the first flange 141 is located between the first connecting member 16 and the first wall 110.

[0207] The first through hole 1100 penetrates the first wall 110 along the thickness direction z of the first wall.

[0208] In some embodiments, the first electrode terminal 14 includes a first terminal body 140 and a first flange 141. The first terminal body 140 can be the main part of the first electrode terminal 14. Along the circumference of the first terminal body 140, the first flange 141 is arranged around and protrudes from the outer periphery of the first terminal body 140.

[0209] Alternatively, as Figure 6 , the first terminal body 140 is generally cylindrical. Figure 8 , Figure 8 This is a perspective exploded view of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application. Figure 8 In the embodiment, the first terminal body 140 may be substantially square.

[0210] In some embodiments, the first terminal body 140 and the first flange 141 can be an integral structure, for example, the first terminal body 140 and the first flange 141 are made by casting, die-casting or other integral molding processes. In other embodiments, the first terminal body 140 and the first flange 141 can be separate structures, for example, the first terminal body 140 and the first flange 141 are connected to each other by welding, bonding, riveting or screw connection.

[0211] “At least a portion of the first terminal body 140 is disposed in the first through hole 1100” means that the first terminal body 140 can be entirely located in the first through hole 1100, the end of the first terminal body 140 facing the interior of the outer shell 11 can be electrically connected to the electrode assembly 12, and the end of the first terminal body 140 facing away from the interior of the outer shell 11 can be directly or indirectly connected to the external busbar component.

[0212] Alternatively, see Figure 7 Along the thickness direction z of the first wall, part of the first terminal body 140 is located in the first through hole 1100, the end of the first terminal body 140 facing away from the electrode assembly 12 extends beyond the outer side surface of the first wall 110, and the end of the first terminal body 140 facing the electrode assembly 12 extends beyond the inner side surface of the first wall 110.

[0213] “At least a portion of the first flange 141 is located between the first connecting member 16 and the first wall 110 along the thickness direction z of the first wall” can be understood as, along the thickness direction z of the first wall, the portion of the first flange 141 is clamped and fixed by the first connecting member 16 and the first wall 110. Figure 7 The first flange 141 is located on the outside of the first wall 110 , and the third connecting section 162 of the first connecting member 16 is located on the side of the first flange 141 away from the first wall 110 .

[0214] In the above scheme, the first electrode terminal 14 has a simple structure and is easy to manufacture. The first connecting member 16 and the first wall 110 constrain the first flange 141, which can limit the displacement of the first electrode terminal 14 along the thickness direction z of the first wall, thereby effectively fixing the first electrode terminal 14 to the first wall 110, reducing the risk of separation between the first wall 110 and the electrode terminal 13, thereby facilitating the improvement of the reliability of the battery cell 10, and further facilitating the improvement of the reliability of the battery device 100.

[0215] In some embodiments of the present application, the second electrode terminal 15 may include a second terminal body and a second flange, similar to that described above, the second flange protrudes from the outer peripheral surface of the second terminal body, at least a portion of the second terminal body is disposed in the second through hole 1101, and along the thickness direction z of the first wall, at least a portion of the second flange is located between the second connecting member 17 and the second wall.

[0216] In some embodiments, the first electrode terminal 14 is secured to the first wall 110 via a first connector 16, and the second electrode terminal 15 is secured to the first wall 110 via a second connector 17. Taking the first electrode terminal 14 as an example, compared to electrode terminals assembled by riveting in related art, the size of the first through-hole 1100 is designed to be larger, taking into account both overcurrent energy and assembly performance. This significantly impacts the structural strength of the first wall 110. By limiting the values ​​of the center distance a between the first and second electrode terminals 14, 15 and the length b of the first wall 110 along the first direction x, the deformation resistance of the first wall 110 can be effectively improved under conditions of a thin thickness and a large opening size. This reduces the risk of the internal expansion force of the battery cell 10 impacting the first wall 110, leading to a disconnection between the electrode terminal 13 and the electrode assembly 12. This improves the reliability of the battery cell 10, and, consequently, the reliability of the battery device 100.

[0217] According to some embodiments of this application, see Figure 6 and Figure 7 The battery cell 10 further includes a first seal 18 , at least a portion of which is disposed between the first terminal body 140 and a wall of the first through hole 1100 .

[0218] The first sealing member 18 is a structural member for forming a seal between the first terminal body 140 and the first through hole 1100. In some embodiments, the first sealing member 18 can be a sealing ring.

[0219] “At least part of the first seal 18 is arranged between the first terminal body 140 and the wall of the first through hole 1100” can be understood as, a part of the first seal 18 can be located between the first terminal body 140 and the wall of the first through hole 1100; or the entire first seal 18 is located between the first terminal body 140 and the wall of the first through hole 1100.

[0220] Alternatively, see Figure 7 A portion of the first seal 18 may be located between the first terminal body 140 and the wall of the first through hole 1100, and another portion of the first seal 18 may be located between the first wall 110 and the first flange 141. In some embodiments, a concave-convex structure is formed between the first seal 18 and the first wall 110 to provide a limiting and positioning function.

[0221] In the above scheme, by setting the first seal 18 between the first terminal body 140 and the hole wall of the first wall 110, on the one hand, the risk of electrolyte leakage from between the first terminal body 140 and the hole wall of the first wall 110 can be reduced, thereby improving the reliability of the battery cell 10; on the other hand, the first seal 18 can be used to insulate and isolate the first terminal body 140 and the first wall 110, thereby reducing the risk of internal short circuit in the battery cell 10, thereby facilitating the improvement of the reliability of the battery cell 10.

[0222] In some embodiments of the present application, the battery cell 10 further includes a second sealant 18 a , at least a portion of which is disposed between the second terminal body and a wall of the second through hole 1101 .

[0223] According to some embodiments of this application, see Figure 6 and Figure 7 The battery cell 10 further includes a first insulating member 19 , at least a portion of which is disposed between the first connecting member 16 and the first electrode terminal 14 .

[0224] The first insulating member 19 is a structural member having insulating properties and serves to insulate and isolate the first connector 16 from the first electrode terminal 14. Exemplary materials for the first insulating member 19 include, but are not limited to, polyphenylene sulfide, polytetrafluoroethylene, polypropylene, and polycarbonate. In some embodiments, the first insulating member 19 may be made of plastic.

[0225] Optionally, the first insulating member 19 can be integrally arranged between the first connecting member 16 and the first electrode terminal 14 , for example, the first insulating member 19 can be arranged between the first connecting section 160 and the first flange 141 , between the second connecting section 161 and the first flange 141 , and between the third connecting section 162 and the first flange 141 .

[0226] Optionally, a portion of the first insulating member 19 can be arranged between the first connecting member 16 and the first electrode terminal 14, and another portion of the first insulating member 19 wraps the portion of the first terminal body 140 exposed to the outside and wraps the first connecting member 16 away from the outer periphery of the first terminal body 140.

[0227] In the above solution, by providing the first insulating member 19 between the first connecting member 16 and the electrode terminal 13, the risk of the first electrode terminal 14 being connected to the first outer wall through the first connecting member 16, causing an internal short circuit in the battery cell 10, can be reduced, thereby improving the reliability of the battery cell 10 and further benefiting the reliability of the battery cell 10.

[0228] In some embodiments, the battery cell 10 further includes a second insulating member, at least a portion of which is disposed between the second connector 17 and the second electrode terminal 15 .

[0229] According to other embodiments of the present application, the first wall 110 and the first connecting member 16 are integrally formed.

[0230] In other embodiments of the present application, the first wall 110 and the first connector 16 are integrally formed by casting, die-casting, stamping, etc. Optionally, the first connector 16 is bent to form the third connecting segment 162 to fix the first electrode terminal 14 to the first wall 110 .

[0231] In the above solution, by setting the first wall 110 and the first connecting member 16 to be integrally formed, on the one hand, the structural strength of the first wall 110 and the first connecting member 16 can be high, which is beneficial to the improvement of the structural stability of the battery cell 10 and the high reliability of the battery cell 10; on the other hand, since the first wall 110 and the first connecting member 16 are an integral structure, the process of assembling parts can be reduced, the manufacturing rhythm of the battery cell 10 can be improved, and the manufacturing efficiency of the battery cell 10 can be improved.

[0232] According to other embodiments of the present application, see Figures 9-11 , Figure 9 Schematic diagram of the structure of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application, Figure 10 This is a perspective exploded view of the first wall 110 and the electrode terminal 13 in some other embodiments of the present application. Figure 11 Schematic diagram of the internal structure of the first wall 110 and the first electrode terminal 14 in some other embodiments of the present application.

[0233] The first wall 110 has a first through hole 1100, and the first electrode terminal 14 includes a first pole 142 and a first conductive member 143. Along the thickness direction z of the first wall, the first conductive member 143 is located on the side of the first wall 110 away from the electrode assembly 12, and a portion of the first pole 142 is located on the side of the first wall 110 facing the electrode assembly 12, and the other portion of the first pole 142 is passed through the through hole and connected to the first conductive member 143.

[0234] In some embodiments, the first electrode terminal 14 includes a first post 142 and a first conductive member 143 connected to each other. Along the thickness direction z of the first wall, the end of the first post 142 facing away from the first conductive member 143 is used to electrically connect to the electrode assembly 12. For example, the end of the first post 142 facing away from the first conductive member 143 is connected to the tab of the electrode assembly 12 through the first adapter 120. The first conductive member 143 is located on the side of the first wall 110 facing away from the electrode assembly 12. The first conductive member 143 can be used to prevent the first post 142 from being separated from the first wall 110.

[0235] Optionally, the first electrode 142 may include a columnar body 1420 and a plate-shaped base 1421. The columnar body 1420 may be disposed through the first through-hole 1100, and the plate-shaped base may be larger than the first through-hole 1100. The plate-shaped base is located inside the first wall 110 to be electrically connected to the electrode assembly 12. The first conductive member 143 may be a plate-shaped member, and the first conductive member 143 may be larger than the first through-hole 1100. The columnar body 1420 passes through the first through-hole 1100 and is connected to the first conductive member 143.

[0236] In some embodiments, the connection between the first pole 142 and the first conductive member 143 includes, but is not limited to, bonding, welding, riveting, or screw connection. Optionally, the first conductive member 143 is provided with a rivet hole, through which the first pole passes and is riveted to the first conductive member 143.

[0237] In the above solution, the first electrode terminal 14 includes a first pole 142 and a first conductive member 143. By interconnecting the first pole 142 and the first conductive member 143, the first electrode terminal 14 can be firmly mounted on the first wall 110, thereby reducing the risk of separation between the first wall 110 and the first electrode terminal 14, so that the battery cell 10 has higher reliability, and thus the battery device 100 has higher reliability.

[0238] In some embodiments, the structure of the second electrode terminal 15 is similar to the structure of the first electrode terminal 14 described above. The second electrode terminal 15 includes a second pole 150 and a second conductive member 151. Along the thickness direction z of the first wall, the second conductive member 151 is located on the side of the first wall 110 away from the electrode assembly 12, a portion of the second pole 150 is located on the side of the first wall 110 facing the electrode assembly 12, and another portion of the second pole 150 is passed through the second through hole 1101 and connected to the second conductive member.

[0239] According to some embodiments of this application, see Figure 10 and Figure 11 The battery cell 10 further includes a first seal 18 , at least a portion of which is disposed between the first electrode 142 and the wall of the first through hole 1100 .

[0240] The first sealing member 18 is a structural member used to form a seal between the first pole 142 and the first through hole 1100. In some embodiments, the first sealing member 18 can be a sealing ring.

[0241] “At least a portion of the first seal 18 is disposed between the first pole 142 and the wall of the first through hole 1100” can be understood as that a portion of the first seal 18 can be located between the first pole 142 and the wall of the first through hole 1100; or the entire first seal 18 is located between the first pole 142 and the wall of the first through hole 1100.

[0242] Alternatively, see Figure 11 A portion of the first seal 18 may be located between the columnar body 1420 and the wall of the first through hole 1100 , and another portion of the first seal 18 may be located between the inner side of the first wall 110 and the plate-shaped base 1421 of the first pole 142 .

[0243] In the above scheme, by setting the first sealant 18 between the first pole 142 and the wall of the first through hole 1100, on the one hand, the risk of electrolyte leakage between the first pole 142 and the wall of the first through hole 1100 can be reduced, thereby improving the reliability of the battery cell 10; on the other hand, the first pole 142 and the first wall 110 can be insulated and isolated by the first sealant 18, thereby reducing the risk of internal short circuit in the battery cell 10, thereby facilitating the improvement of the reliability of the battery cell 10.

[0244] According to some embodiments of the present application, the battery cell 10 further includes a first insulating member 19 , and at least a portion of the first insulating member 19 is disposed between the first wall 110 and the first conductive member 143 .

[0245] The first insulating member 19 is a structural member having insulating properties, which serves to insulate and isolate the first conductive member 143 from the first wall 110. Exemplary materials for the first insulating member 19 include, but are not limited to, polyphenylene sulfide, polytetrafluoroethylene, polypropylene, and polycarbonate. In some embodiments, the first insulating member 19 may be made of plastic.

[0246] Optionally, the first insulating member 19 may be entirely disposed between the first conductive member 143 and the first wall 110 .

[0247] Optionally, a portion of the first insulating member 19 may be disposed between the first conductive member 143 and the first wall 110 , and another portion of the first insulating member 19 may surround at least a portion of the outer circumference of the first conductive member 143 .

[0248] In the above solution, by arranging the first insulating member 19 between the first wall 110 and the first conductive member 143, the risk of the first electrode end being connected to the shell of the first wall 110, resulting in an internal short circuit of the battery cell 10, can be reduced, thereby improving the reliability of the battery cell 10 and further benefiting the reliability of the battery cell 10.

[0249] According to some embodiments of the present application, some embodiments of the present application further provide a battery device 100 , comprising the battery cell 10 provided in the first aspect.

[0250] According to some embodiments of the present application, some embodiments of the present application further provide an electrical device, including the battery cell 10 provided in the first aspect and / or the battery device 100 provided in the second aspect, wherein the battery cell 10 is used to provide electrical energy.

[0251] According to some embodiments of the present application, a battery device 100 is further provided. The battery device 100 includes the battery cell 10 described above.

[0252] See Figure 2 The battery device 100 includes a battery cell 10 and a box body 20 , and the battery cell 10 is accommodated in the box body 20 .

[0253] Optionally, multiple battery cell assemblies are provided in the housing 20, each battery cell assembly comprising multiple stacked battery cells 10, which are connected in series via a busbar. In some embodiments, multiple battery cell assemblies may be connected in series via a busbar.

[0254] According to some embodiments of the present application, an electrical device is further provided, comprising the battery cell 10 provided above and / or the battery device 100 provided above. The battery cell 10 provided above and / or the battery device 100 provided above are used to provide electrical energy.

[0255] Optionally, the electrical device is a vehicle 1000 , and the battery cell 10 can serve as a driving power source and / or a control power source for the vehicle 1000 .

[0256] According to some embodiments of the present application, a battery cell 10 is provided. Figure 3-Figure 11 .

[0257] The battery cell 10 includes a shell 11, an electrode assembly 12 and an electrode terminal 13. The electrode terminal 13 includes a first electrode terminal 14 and a second electrode terminal 15 with opposite polarities. The shell 11 has a first wall 110. The material of the first wall 110 can be steel. The thickness of the first wall 110 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm. The electrode assembly 12 is arranged in the shell 11. Along the first direction x, the first electrode terminal 14 and the second electrode terminal 15 are spaced apart from each other on the first wall 110. The first electrode terminal 14 and the second electrode terminal 15 are electrically connected to the electrode assembly 12 respectively. The first direction x is the length direction of the first wall 110. Among them, along the first direction x, the center distance between the first electrode terminal 14 and the second electrode terminal 15 is a, and the length of the first wall 110 is b, satisfying a / b≤94.4%.

[0258] In battery cells 10 of different specifications, the length b of the first wall 110 is different. Correspondingly, the range of the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is also different.

[0259] Illustratively, in specification one, when the length b of the first wall 110 is greater than or equal to 177 mm and less than 210 mm, a / b ≤ 94.4% is satisfied; optionally, along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 106 mm and less than or equal to 160 mm; optionally, in some embodiments, 50.4% ≤ a / b ≤ 76.2% can be satisfied.

[0260] Specification two: when the length b of the first wall 110 is greater than or equal to 210 mm and less than 240 mm, a / b ≤ 92.4% is satisfied; optionally, along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 135 mm and less than or equal to 194 mm. Optionally, in some embodiments, 56.2% ≤ a / b ≤ 80.9% can be satisfied.

[0261] Specification three: when the length b of the first wall 110 is greater than or equal to 240 mm and less than 270 mm, a / b ≤ 88.8% is satisfied; optionally, along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 156 mm and less than or equal to 213 mm. Optionally, in some embodiments, 57.7% ≤ a / b ≤ 78.9% can be satisfied.

[0262] Specification four: when the length b of the first wall 110 is greater than or equal to 270 mm and less than or equal to 320 mm, a / b≤85.2% is satisfied, and along the first direction x, the center distance a between the first electrode terminal 14 and the second electrode terminal 15 is greater than or equal to 170 mm and less than or equal to 230 mm. Optionally, in some embodiments, 55.5%≤a / b≤71.9% can be satisfied.

[0263] In some embodiments, in the four specifications of battery cells 10 provided above, along the first direction x, the ratio a / b of the center distance a between the first electrode terminal 14 and the second electrode terminal 15 and the length b of the first wall 110 can satisfy 40%≤a / b≤90%, 50%≤a / b≤85%, 50%≤a / b≤82%, 50%≤a / b≤79% or 50%≤a / b≤75%.

[0264] In some embodiments, the first wall 110 may be an end cover of the housing 11 , and the first wall 110 is connected to the shell 111 of the housing 11 to close the first opening of the shell 111 , so that the electrode assembly 12 is in a closed space.

[0265] In some embodiments, the electrode terminal 13 may be fixed to the first wall 110 via a connector, such as a welding ring. In other embodiments, the electrode terminal 13 may include a pole and a conductive member, which are fixed to the first wall 110 by riveting the pole and the conductive member.

[0266] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: The housing has a first wall, the first wall is made of steel, and the thickness of the first wall is greater than or equal to 0.2 mm and less than or equal to 1.5 mm; an electrode assembly, disposed in the housing; a first electrode terminal and a second electrode terminal with opposite polarities, the first electrode terminal and the second electrode terminal being spaced apart and arranged on the first wall along a first direction, the first electrode terminal and the second electrode terminal being electrically connected to the electrode assembly, respectively, the first direction being the length direction of the first wall; Wherein, along the first direction, the center distance between the first electrode terminal and the second electrode terminal is a, the length of the first wall is b, and 40%≤a / b≤90% is satisfied.

2. The battery cell according to claim 1, wherein: The length b of the first wall is greater than or equal to 170 mm and less than 210 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 105 mm and less than or equal to 160 mm.

3. The battery cell according to claim 1, wherein: The length b of the first wall is greater than or equal to 170 mm and less than 210 mm, satisfying 50%≤a / b≤85%.

4. The battery cell according to claim 1, wherein: The length b of the first wall is greater than or equal to 210 mm and less than 240 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 120 mm and less than or equal to 190 mm.

5. The battery cell according to claim 1, characterized in that The length b of the first wall is greater than or equal to 210 mm and less than 240 mm, satisfying 50%≤a / b≤82%.

6. The battery cell according to claim 1, characterized in that The length b of the first wall is greater than or equal to 240 mm and less than 270 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 135 mm and less than or equal to 213 mm.

7. The battery cell according to claim 1, characterized in that The length b of the first wall is greater than or equal to 240 mm and less than 270 mm, satisfying 50%≤a / b≤79%.

8. The battery cell according to claim 1, wherein: The length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, and along the first direction, the center distance a between the first electrode terminal and the second electrode terminal is greater than or equal to 170 mm and less than or equal to 230 mm.

9. The battery cell according to claim 1, characterized in that The length b of the first wall is greater than or equal to 270 mm and less than or equal to 320 mm, satisfying 50%≤a / b≤75%.

10. The battery cell according to claim 1, characterized in that The thickness of the first wall is greater than or equal to 0.5 mm and less than or equal to 1.3 mm.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The housing comprises a shell and an end cover, the shell having a first opening, the end cover being connected to the shell and closing the first opening; The first wall is the end cover, and the thickness of the first wall is greater than the thickness of the shell.

12. The battery cell according to claim 11, characterized in that The shell is made of steel, and the thickness of the shell is not less than 0.075 mm and not more than 0.35 mm.

13. The battery cell according to claim 12, characterized in that: The thickness of the shell is not less than 0.15 mm and not more than 0.25 mm.

14. The battery cell according to claim 1, characterized in that The battery cell further includes a first connecting member, which is at least partially disposed on an outer periphery of the first electrode terminal and is used to fix the first electrode terminal to the first wall.

15. The battery cell according to claim 14, characterized in that Along the thickness direction of the first wall, the first connecting member is located on a side of the first wall away from the electrode assembly.

16. The battery cell according to claim 15, characterized in that The first connecting member is connected to the first wall. A first groove is formed on a side of the first wall away from the electrode assembly along the thickness direction of the first wall. The first groove is used to accommodate a portion of the first connecting member.

17. The battery cell according to claim 14, characterized in that The first wall includes a first through hole, the first electrode terminal includes a first terminal body and a first flange, the first flange protrudes from the outer peripheral surface of the first terminal body, at least a portion of the first terminal body is arranged in the first through hole, and along the thickness direction of the first wall, at least a portion of the first flange is located between the first connecting member and the first wall.

18. The battery cell according to claim 17, characterized in that The battery cell further includes a first sealant, at least a portion of which is disposed between the first terminal body and a hole wall of the first through hole.

19. The battery cell according to claim 14, characterized in that The battery cell further includes a first insulating member, at least a portion of which is disposed between the first connecting member and the first electrode terminal.

20. The battery cell according to claim 14, characterized in that The first wall and the first connecting member are integrally formed.

21. The battery cell according to claim 1, characterized in that The first wall has a first through hole, and the first electrode terminal includes a first pole and a first conductive member. Along the thickness direction of the first wall, the first conductive member is located on the side of the first wall away from the electrode assembly, a portion of the first pole is located on the side of the first wall facing the electrode assembly, and the other portion of the first pole is passed through the first through hole and connected to the first conductive member.

22. The battery cell according to claim 21, characterized in that The battery cell further includes a first sealant, at least a portion of which is disposed between the first electrode post and a wall of the first through hole.

23. The battery cell according to claim 21, characterized in that The battery cell further includes a first insulating member, at least a portion of which is disposed between the first wall and the first conductive member.

24. A battery device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 23.

25. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 23, and / or the battery device according to claim 24, wherein the battery cell is used to provide electrical energy.

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