Battery cells, batteries, and electrical devices

Abstract

A battery cell (102), a battery (100), and an electric device belonging to the field of battery technology are provided. Here, the battery cell (102) comprises a first housing wall (11), an electrode column (2), and a sealing insulation assembly (3), wherein the first housing wall (11) is provided with a mounting hole (12), and the electrode column (2) comprises a through-hole (21) penetrating the mounting hole (12), and a first contact portion (22) and a second contact portion (23) connected to the through-hole (21) and contacted to both sides of the first housing wall (11), wherein the first contact portion (22) is contacted to the first housing wall (11) through riveting, and the sealing insulation assembly (3) is insulatingly coupled between the electrode column (2) and the first housing wall (11), and comprises a first insulating member (31) installed at least partially between the first contact portion (22) and the first housing wall (11), and a second insulating member (32) installed at least partially between the second contact portion (23) and the first housing wall (11), and the first insulating The elastic modulus of member (31) is less than or equal to the elastic modulus of the second insulating member (32).

Description

Technology Field

[0001] The present application claims priority to a Chinese patent application with application number 202420031881.2 and filing date January 5, 2024, and all contents of said Chinese application are incorporated into the present application by reference.

[0002] This application relates to the field of battery technology, and in particular to battery cells, batteries, and electric devices. Background Technology

[0003] In recent years, new energy vehicles have made rapid progress, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. Here, power batteries include multiple battery cells, but the reliability of the battery cells must be improved.

[0004] The embodiments of the present application provide a battery cell, a battery, and an electric device capable of improving the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a first housing wall, an electrode column, and a sealing insulation assembly, wherein the first housing wall is provided with a mounting hole, and the electrode column comprises a through-hole penetrating the mounting hole, and a first contact portion and a second contact portion connected to the through-hole and contacted to both sides of the first housing wall, wherein the first contact portion contacts the first housing wall through riveting, and the sealing insulation assembly is insulatingly coupled between the electrode column and the first housing wall and comprises a first insulating member installed at least partially between the first contact portion and the first housing wall, and a second insulating member installed at least partially between the second contact portion and the first housing wall, wherein the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, and the first insulating member is elastically compressed between the first contact portion and the first housing wall to seal between the first contact portion and the first housing wall.

[0006] In the above technical solution, when an electrode column is riveted to the first housing wall, the deformed first joint applies a force to the first insulating member. Since the elastic modulus of the first insulating member is smaller than or equal to the elastic modulus of the second insulating member, the first insulating member has a relatively stronger deformation capacity or relatively smaller stiffness compared to the second insulating member. Consequently, the first insulating member can absorb the force applied to the first joint deformed by riveting through deformation, thereby reducing the risk of cracking of the first insulating member. This is advantageous for improving the sealing reliability between the first housing wall and the electrode column and for improving the reliability of the battery cell.

[0007] In some embodiments, the first insulating member comprises a first main body portion and a first extension portion, the first main body portion is located on one side of a first contact portion facing a first housing wall, and the first extension portion is connected to the first main body portion and protrudes in a direction away from the first housing wall relative to the first main body portion and stops at one side of the first contact portion away from the center axis of the mounting hole.

[0008] In the above technical solution, since a short circuit problem can easily occur when a metal wire, etc. is formed during the riveting process and overflows from the edge of the first joint and comes into contact with the first housing wall, the reliability of the battery cell can be further improved by installing a first extension in the overflow path to block it, thereby reducing the risk of a short circuit caused by the metal wire overflow.

[0009] In some embodiments, the first insulating member comprises a first main body portion and a second extension portion, the first main body portion is located on one side of a first contact portion facing a first housing wall, and the second extension portion is connected to the first main body portion and extends into a mounting hole.

[0010] In the above technical solution, since the first insulating member includes a second extension extending into the mounting hole, the second extension can be used to insulatingly block the hole wall of the through-hole and the mounting hole, thereby further reducing the risk of a short circuit between the electrode column and the housing and reducing the difficulty of insulating between the through-hole and the housing, thus reducing the use of the insulating member. Additionally, since the first insulating member includes a second extension extending into the mounting hole, when assembling the first insulating member to the wall of the first housing, the second extension can be used to perform an assembly positioning function, thereby improving the assembly efficiency of the first insulating member and enhancing the assembly stability of the first insulating member, which is advantageous for the assembly of the electrode column.

[0011] In some embodiments, a first corner is formed at the connection portion between the second extension and the first main body, facing the first housing wall, and the first corner is formed as a chamfer.

[0012] In the above technical solution, when assembling an electrode column on the first housing wall, the second corner compresses the first corner, making it prone to cracking at the location of the first corner. Therefore, if the first corner is installed in a chamfered shape, the area of ​​force received by the first corner is increased when the second corner applies force to the first corner, thereby dispersing the force received at the location of the first corner and reducing the risk of cracking at the location of the first corner.

[0013] In some embodiments, a first corner is formed in the connection portion between the second extension and the first main body portion, which is installed toward the first housing wall, and the first housing wall includes a second corner installed to correspond to the first corner, and the second corner is formed as a chamfer.

[0014] In the above technical solution, when assembling an electrode column on the first housing wall, the second corner compresses the first corner, making it easy for the first insulating member to crack at the location of the first corner. Therefore, if the second corner is installed in a chamfered shape, the area of ​​force applied by the second corner to the first corner can be increased, thereby dispersing the location where the force is applied. This reduces the concentration of the applied force on the location of the first corner, thereby reducing the risk of the first insulating member cracking at the location of the first corner.

[0015] In some embodiments, the second insulating member includes a second main body portion and a third extension portion, the second main body portion is located on one side of a second contact portion facing the first housing wall, and the third extension portion is connected to the second main body portion and extends into a mounting hole.

[0016] In the above technical solution, since the second insulating member includes a third extension extending into the mounting hole, the third extension can be used to insulatingly block the hole wall of the penetration and the mounting hole, thereby further reducing the risk of a short circuit between the electrode column and the housing and reducing the difficulty of insulating between the penetration and the housing, thus reducing the use of the insulating member. Additionally, since the second insulating member includes a third extension extending into the mounting hole, when assembling the second insulating member to the wall of the first housing, the third extension can be used to perform an assembly positioning function, thereby improving the assembly efficiency of the second insulating member and enhancing the assembly stability of the second insulating member, which is advantageous for the assembly of the electrode column.

[0017] In some embodiments, the second contact portion is installed on the inner side of the first housing wall, and the second insulating member includes a second main body portion and a fourth extension portion, the second main body portion is located on one side of the second contact portion facing the first housing wall; the fourth extension portion is connected to one side of the second main body portion away from the electrode column and is installed with a gap between the first housing wall and the active material coating portion located on the inner side of the first housing wall.

[0018] In the above technical solution, since the second insulating member has a wide range, it can not only serve to insulate between the second contact portion and the first housing, but also serve to insulate between the first housing wall and the active material coating portion, thereby simplifying the structure of the battery cell, reducing production costs, and improving production efficiency.

[0019] In some embodiments, the second insulating member is elastically compressed between the second contact portion and the first housing wall to seal the space between the second contact portion and the first housing wall.

[0020] In the above technical solution, since the second insulating member also has elastic deformation capability, it is possible to achieve a seal between the second contact part and the first housing wall through elastic compression. This allows for not only achieving a seal between the first contact part and the first housing wall through elastic compression of the first insulating member, but also achieving a seal between the second contact part and the first housing wall through elastic compression of the second insulating member, thereby further enhancing the sealing effect of the sealing insulating assembly between the first housing wall and the electrode column.

[0021] In some embodiments, the elastic modulus of the first insulating member is 6 MPa or less, and the compressibility of the first insulating member is 10% to 50%.

[0022] In the above technical solution, by setting the elastic modulus of the first insulating member to 6 MPa or less and the compression ratio of the first insulating member to 10% to 50%, the problem of cracking of the first insulating member can be prevented relatively effectively.

[0023] In some embodiments, the compression ratio of the first insulating member is 32% to 38%.

[0024] In the above technical solution, by setting the elastic modulus of the first insulating member to 6 MPa or less and the compression ratio of the first insulating member to 32% to 38%, not only can the requirement for no cracking be satisfied, but a good sealing effect can also be satisfied.

[0025] In some embodiments, the material of the first insulating member comprises one of fluororubber, perfluoroalkylate, polypropylene, and ethylene propylene diene monomer.

[0026] In the above technical solution, the material of the first insulating member is simple, universal, and easy to mass-produce.

[0027] In some embodiments, in the radial direction of the mounting hole, the extension dimension of the second contact portion is greater than or equal to the extension dimension of the first contact portion.

[0028] In the above technical method, when riveting an electrode column to the first housing wall, when processing the first joint portion through the riveting process, the radial extension dimension of the second joint portion is greater than or equal to the radial extension dimension of the first joint portion, so the second joint portion can be reliably joined to the first housing wall and is not easily detached from the mounting hole, thereby allowing the riveting to proceed smoothly and ensuring that the first joint portion is properly riveted, thereby improving the bonding stability with the first housing after riveting the electrode column.

[0029] In some embodiments, the first contact portion is contacted to the outside of the first housing wall, and the second contact portion is contacted to the inside of the first housing wall.

[0030] In the above technical solution, the first contact portion is contacted to the outside of the first housing wall, and the first insulating member is mounted to the outside of the first housing wall so that at least a portion of it may be exposed to the outside of the first housing wall. Therefore, since the mounting status of the first insulating member can be directly observed from the outside of the first housing wall, the omission of the first insulating member can be detected without the need for a gas leak inspection process, which is advantageous for improving the production efficiency of the battery cell.

[0031] In some embodiments, a battery cell has a receiving cavity formed on the inner side of a first housing wall, and an electrode column has a receiving groove formed that is open in a direction away from the receiving cavity, and the electrode column is provided with a communication hole, and the communication hole penetrates one side of the groove wall of the receiving groove near the receiving cavity to communicate with the receiving cavity and the receiving groove.

[0032] In the above technical solution, when an electrolyte is injected into a battery cell, the electrolyte can be injected into a receiving groove and then flow into a receiving cavity through a connecting hole. Here, the receiving groove can serve to buffer and store the electrolyte, thereby improving the problem of the electrolyte splashing or overflowing. Additionally, the side wall of the receiving groove (i.e., the groove wall extending from the opening of the receiving groove toward the receiving cavity) prevents the electrolyte from splashing to some extent, thereby reducing contamination of the electrolyte into the external environment and facilitating rapid injection. Furthermore, since there is no need to install a separate liquid injection channel in the housing, special processing of the housing is not required, which is advantageous for reducing the structural complexity and processing difficulty of the housing.

[0033] In some embodiments, the battery cell comprises a battery cell assembly, the battery cell assembly comprises an active material coating portion received in a receiving cavity and a conductive portion connected to the active material coating portion, and the conductive portion is received at least partially in a receiving groove by passing through a communication hole.

[0034] In the above technical solution, at least a portion of the conductive part is accommodated in a receiving groove so that at least a portion of the conductive part occupies space within the receiving groove, thereby reducing the space occupied by the conductive part within the receiving cavity and saving space within the receiving cavity, so that a larger volume of active material coating part can be accommodated, which is advantageous for improving the energy density of the battery cell or reducing the size of the battery cell without changing the energy density of the battery cell.

[0035] In some embodiments, the battery cell includes a cover plate covering a receiving groove, and the cover plate has a liquid injection hole formed therein that communicates with the receiving groove, and the battery cell further includes a sealing structure for sealing the liquid injection hole.

[0036] In the above technical solution, by processing the liquid injection hole in the cover plate, the opening is made relatively small and located externally, allowing reliable sealing of the liquid injection port to be achieved relatively easily through the sealing structure, thereby improving the operational reliability of the battery cell and enabling a flexible and diversified design of the sealing structure.

[0037] In a second aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any one of the above methods.

[0038] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is advantageous for improving the performance of the battery.

[0039] In a third aspect, an embodiment of the present application further provides an electric device comprising a battery according to any one of the above methods.

[0040] In the above technical solution, since the performance of the battery is improved, it is advantageous for improving the operating electrical performance of the electric device. Brief explanation of the drawing

[0041] In order to more clearly explain the technical method of the embodiments of the present application, the drawings to be used in the embodiments below will be briefly introduced. Since the attached drawings illustrate only some embodiments of the present application, they should not be considered as limiting the scope, and those skilled in the art will understand that other related drawings can be obtained based on these drawings without creative labor. FIG. 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application. FIG. 2 is an exploded view of the structure of a battery provided in some embodiments of the present application. FIG. 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Figure 4 is an exploded view of the structure of the battery cell shown in Figure 3. FIG. 5 is an orthographic schematic diagram of a battery cell provided in some embodiments of the present application. Figure 6 is a cross-sectional view along line AA of Figure 5. Figure 7 is a partial enlarged view of part B, which is circled in Figure 6. Figure 8 is a partial enlarged view of part C, which is circled in Figure 7. Figure 9 is a schematic diagram of the electrode column and sealed insulation assembly shown in Figure 4. FIG. 10 is a partial cross-sectional view of a battery cell according to some embodiments of the present application. FIG. 11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. FIG. 12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. Specific details for implementing the invention

[0042] To clarify the purpose, technical solution, and advantages of the embodiments of the present application, the technical solution of the embodiments of the present application is explained below in conjunction with the drawings of the embodiments of the present application. The described embodiments are not all embodiments but some embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary knowledge in the art without creative labor fall within the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as generally understood by those skilled in the art to which this application is applied; terms used in the specification of this application are used only for the purpose of describing specific embodiments and are not intended to limit this application. In the specification, claims, and description of the drawings above, the terms “comprising,” “having,” and any variations thereof are intended to encompass non-exclusive inclusions. In the specification and claims of this application or in the drawings above, terms such as “first,” “second,” etc., are not intended to describe a specific order or primary and secondary relationship, but are intended to distinguish different objects.

[0044] In this application, references to "Examples" mean that specific features, structures, or characteristics described in relation to the Examples may be included in at least one Example of this application. The relevant phrases appearing at each location in the specification do not necessarily refer to the same Example, nor are they independent or alternative Examples mutually exclusive from other Examples.

[0045] It should be noted that in the description of this application, terms such as “mounting,” “connecting,” “linking,” and “attaching” should be understood in a broad sense unless otherwise specified and limited, for example, they may be fixed connections, detachable connections or integral connections, or direct connections, indirect connections through an intermediate medium, or internal communication between two components. A person skilled in the art will understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0046] In this application, the term "and / or" merely describes an association describing related objects and implies that there may be three types of relationships; for example, A and / or B means three cases where A exists alone, A and B exist simultaneously, or B exists alone. Additionally, in this application, the symbol " / " generally indicates that the related objects are in an "or" relationship.

[0047] In the embodiments of the present application, the same reference numerals denote the same components, and for brevity, detailed descriptions of the same components in other embodiments are omitted. It should be understood that the thickness, length, width, and size of the various components of the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and size of the integrated device are merely illustrative descriptions and should not constitute any limitation to the configuration of the present application.

[0048] In this application, "plural" means two or more (including two).

[0049] In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and the embodiments of this application are not limited thereto. The battery cell may be formed in a cylindrical, flat, rectangular, or other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to the packaging method: cylindrical battery cells, rectangular battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto.

[0050] The battery referred to in the embodiments of the present application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. A battery module generally comprises a plurality of battery cells. A battery pack generally comprises a box body for packaging one or more battery cells or one or more battery modules. The box body can prevent liquid or other foreign substances from affecting the charging or discharging of the battery cells.

[0051] A battery cell comprises a housing, a battery cell assembly, and an electrolyte, and the housing is used to accommodate the battery cell assembly and the electrolyte. The battery cell assembly comprises at least one electrode assembly, and the electrode assembly is composed of a positive plate, a negative plate, and a separator; the electrode assembly may have a wound structure, a stacked structure, etc. The battery cell operates primarily by relying on the movement of metal ions between the positive plate and the negative plate.

[0052] The positive plate may generally include a positive current collector and a positive active material layer, and the positive active material layer is coated directly or indirectly on the positive current collector. A positive current collector not coated with the positive active material layer protrudes from the positive current collector coated with the positive active material layer, and the positive current collector not coated with the positive active material layer is used as a positive tab. Taking a lithium-ion battery as an example, the positive current collector material may be aluminum, and the positive active material layer material may be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0053] The cathode plate may generally include a cathode current collector and a cathode active material layer, and the cathode active material layer is coated directly or indirectly on the cathode current collector. A cathode current collector without the cathode active material layer coating protrudes from the cathode current collector coated with the cathode active material layer, and the cathode current collector without the cathode active material layer coating is used as a cathode tab. The material of the cathode current collector may be copper, and the material of the cathode active material layer may be carbon or silicon, etc.

[0054] To prevent melting when a high current passes, multiple positive tabs are stacked together to form a positive tab portion, and multiple negative tabs are stacked together to form a negative tab portion. An electrode column is installed in the housing, and the positive tab portion is electrically connected to the positive electrode column, and the negative tab portion is electrically connected to the negative electrode column. For example, the tab portion can be connected to the electrode column to form a direct electrical connection between the tab portion and the electrode column. Alternatively, for example, the battery cell assembly may include a connecting piece, the tab portion is connected to the connecting piece, and the connecting piece is connected to the electrode column to form an indirect electrical connection between the tab portion and the electrode column.

[0055] The material of the separator is not limited and may be, for example, polypropylene or polyethylene.

[0056] In some battery cells of related technology, electrode columns are mounted to a housing via a riveting method. To ensure an insulating seal between the housing and the electrode columns, insulating plastic is typically installed between the electrode columns and the housing before riveting. However, when the electrode columns are riveted, they deform under force and compress the insulating plastic. Consequently, weaker parts of the insulating plastic are susceptible to cracking. If cracks occur in the insulating plastic, it affects the reliability of the insulating seal between the housing and the electrode columns, thereby degrading the reliability of the battery cell.

[0057] Accordingly, embodiments of the present application provide a battery cell comprising a housing, an electrode column, and a sealing insulation assembly, wherein the housing comprises a first housing wall, the first housing wall is provided with a mounting hole, the electrode column comprises a through-hole penetrating the mounting hole, and a first contact portion and a second contact portion connected to the through-hole and contacted to both sides of the first housing wall, the first contact portion contacted to the first housing wall through riveting, and the sealing insulation assembly is insulatingly coupled between the electrode column and the first housing wall and comprises a first insulating member installed at least partially between the first contact portion and the first housing wall, and a second insulating member installed at least partially between the second contact portion and the first housing wall, wherein the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, and the first insulating member is elastically compressed between the first contact portion and the first housing wall to seal between the first contact portion and the first housing wall.

[0058] Therefore, when riveting an electrode column to the first housing wall, since the first joint is formed by riveting, the deformed first joint applies a force to the first insulating member during the riveting process, making the first insulating member prone to cracking. However, by setting the elastic modulus of the first insulating member to be smaller than or equal to the elastic modulus of the second insulating member, the first insulating member has a relatively stronger deformation capacity or relatively smaller stiffness compared to the second insulating member. Consequently, the first insulating member can absorb the force applied to the first joint deformed by riveting through deformation, thereby reducing the risk of cracking in the first insulating member. This is advantageous for improving the reliability of the insulating sealing joint between the first housing wall and the electrode column and for improving the reliability of the battery cell.

[0059] Embodiments of the present application provide an electric device that uses a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, battery car, electric vehicle, ship, aircraft, etc. Here, electric toys may include stationary or mobile electric toys such as game consoles, electric vehicle toys, electric ship toys, electric airplane toys, etc., and aerospace devices may include airplanes, rockets, space shuttles, spacecraft, etc.

[0060] In the following embodiments, for convenience of explanation, a vehicle (1000) is described as an example of an electric device according to an embodiment of the present application.

[0061] Referring to FIG. 1, FIG. 1 is a schematic diagram of the structure of a vehicle (1000) provided in some embodiment of the present application. The vehicle (1000) may be a fuel vehicle, a gasoline vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A battery (100) is installed inside the vehicle (1000), and the battery (100) may be installed in the bottom part, the head part, or the tail part of the vehicle (1000). The battery (100) may be used to supply power to the vehicle (1000), and for example, the battery (100) may be used as the operating power of the vehicle (1000). The vehicle (1000) may further include a controller (200) and a motor (300), and the controller (200) is used to control the battery (100) to supply power to the motor (300) (e.g., used for power demands during operation, navigation, and driving of the vehicle (1000)).

[0062] In some embodiments of the present application, the battery (100) can be used not only as an operating power source for the vehicle (1000), but also as a driving power source for the vehicle (1000), and completely or partially replaces fuel oil or natural gas to provide driving power to the vehicle (1000).

[0063] Referring to FIG. 2, FIG. 2 is an exploded view of the structure of a battery (100) provided in some embodiments of the present application. The battery (100) includes a box body (101) and a plurality of battery cells (102), and the battery cells (102) are accommodated within the box body (101). Here, the box body (101) provides an assembly space for the battery cells (102), and the box body (101) may adopt various structures. In some embodiments, the box body (101) may include a first box body (1011) and a second box body (1012), the first box body (1011) is coupled to the second box body (1012) in a covering manner, and the first box body (1011) and the second box body (1012) together define an assembly space for accommodating the battery cells (102). The second box body (1012) may be a hollow structure with one end open, and the first box body (1011) may be a plate-shaped structure, and the first box body (1011) is coupled to the open side of the second box body (1012) in a cover manner, so that the first box body (1011) and the second box body (1012) together define an assembly space; the first box body (1011) and the second box body (1012) may both be hollow structures with one side open, and the open side of the first box body (1011) is coupled to the open side of the second box body (1012) in a cover manner. Of course, the box body (101) formed by the first box body (1011) and the second box body (1012) may be of various shapes, such as a cylinder or a rectangular prism.

[0064] In the battery (100), a plurality of battery cells (102) may be connected in series, parallel, or mixed, and a mixed connection means a connection in which both series and parallel exist simultaneously among the plurality of battery cells (102). A plurality of battery cells (102) may be directly connected in series, parallel, or mixed so that the entire assembly composed of the plurality of battery cells (102) can be accommodated within a box body (101); of course, the battery (100) may first form the shape of a battery module by connecting the plurality of battery cells (102) in series, parallel, or mixed, and then the plurality of battery modules may be connected in series, parallel, or mixed to form a single whole and accommodated within the box body (101). The battery (100) may further include other structures, for example, the battery (100) may further include a bus member for implementing an electrical connection between the plurality of battery cells (102).

[0065] Here, each battery cell (102) may be a secondary battery or a primary battery; it may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell (102) may be a cylinder, a flattened shape, a rectangular prism, etc. For example, FIG. 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application, and referring to the embodiment illustrated in FIG. 3, the length direction of the battery cell (102) is the first direction (X), the width direction of the battery cell (102) is the second direction (Y), the height direction of the battery cell (102) is the third direction (Z), and the first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other.

[0066] FIG. 4 is an exploded view of the structure of the battery cell (102) shown in FIG. 3, FIG. 5 is an orthographic schematic view of the battery cell (102) provided in some embodiment of the present application, FIG. 6 is a cross-sectional view along line AA of FIG. 5, and FIG. 7 is a partial enlarged view of part B marked with a circle in FIG. 6. In some embodiment of the present application, FIG. 3, FIG. 4 and FIG. 7 combined, the battery cell (102) includes a housing (1) and an electrode column (2), the electrode column (2) is installed in the housing (1), and a receiving cavity (10) is formed inside the housing (1). For example, the battery cell (102) may include a battery cell assembly (4), and the battery cell assembly (4) may include an active material coating portion (41) and a conductive portion (42) connected to the active material coating portion (41), the active material coating portion (41) may be received in a receiving cavity (10), and the conductive portion (42) may be welded to an electrode column (2) so that the conductive portion (42) is electrically connected between the active material coating portion (41) and the electrode column (2). It may be understood that the active material coating portion (41) may include a current collector coated with an active material layer, and the conductive portion (42) may include only a tab portion, or may include a tab portion and a connecting piece electrically connected to the tab portion, but is not limited thereto.

[0067] FIG. 8 is a partial enlarged view of part C marked with a circle in FIG. 7, and FIG. 9 is a schematic diagram of the electrode column (2) and the sealing insulation assembly (3) shown in FIG. 4. When FIG. 4, FIG. 8 and FIG. 9 are combined, the housing (1) includes a first housing wall (11), the first housing wall (11) is provided with a mounting hole (12), and the electrode column (2) is mounted on the first housing wall (11) by passing through the mounting hole (12). Here, the electrode column (2) includes a penetration portion (21), and the penetration portion (21) penetrates the mounting hole (12), that is, at least a portion of the penetration portion (21) is located within the mounting hole (12), and if the axial direction of the mounting hole (12) is set as the projection direction and a plane perpendicular to the axial direction of the mounting hole (12) is set as the projection plane, then the projection of the penetration portion (21) in the projection plane is within the projection range of the mounting hole (12) in the projection plane, so that the penetration portion (21) can penetrate the mounting hole (12).

[0068] When combining FIGS. 8 and FIGS. 9, the electrode column (2) further includes a first contact portion (22) and a second contact portion (23) connected to the penetration portion (21) and contacted to both sides of the first housing wall (11). Specifically, both the first contact portion (22) and the second contact portion (23) are connected to the penetration portion (21), and the first contact portion (22) and the second contact portion (23) are each contacted to both sides in the wall thickness direction of the first housing wall (11). For example, the two surfaces in the wall thickness direction of the first housing wall (11) are each an outer surface and an inner surface, the inner surface is the surface of the first housing wall (11) facing the receiving cavity (10), the outer surface is the surface of the first housing wall (11) moving away from the receiving cavity (10), one side of the outer surface moving away from the receiving cavity (10) is the outer side of the outer surface, and one side of the inner surface facing the receiving cavity (10) is the inner side of the inner surface. The first contact portion (22) is connected to the penetration portion (21) and extends in a direction away from the center axis (L) of the mounting hole (12) with respect to the penetration portion (21), and the second contact portion (23) is connected to the penetration portion (21) and extends in a direction away from the center axis (L) of the mounting hole (12) with respect to the penetration portion (21), and the first contact portion (22) extends outward to the outer surface of the first housing wall (11) and the second contact portion (23) extends inward to the inner surface of the first housing wall (11), or the first contact portion (22) extends inward to the inner surface of the first housing wall (11) and the second contact portion (23) extends outward to the outer surface of the first housing wall (11).

[0069] Here, since the first contact portion (22) and the second contact portion (23) are each in contact with the first housing wall (11), the contact does not need to be direct contact, and can be indirect contact as long as there is a stopping and position limiting effect. Accordingly, at least a portion of the first contact portion (22) faces the first housing wall (11) to prevent the electrode column (2) from moving toward the second contact portion (23) relative to the first housing wall (11), and at least a portion of the second contact portion (23) faces the first housing wall (11) to prevent the electrode column (2) from moving toward the first contact portion (22) relative to the first housing wall (11). If the axial direction of the mounting hole (12) is set as the projection direction and the plane perpendicular to the axial direction of the mounting hole (12) is set as the projection plane, then the projection of the first joint part (22) in the projection plane and the projection of the first housing wall (11) in the projection plane have an intersection area, and the part of the first joint part (22) corresponding to the intersection area faces the first housing wall (11), and the projection of the second joint part (23) in the projection plane and the projection of the first housing wall (11) in the projection plane have an intersection area, and the part of the second joint part (23) corresponding to the intersection area faces the first housing wall (11).

[0070] In an embodiment of the present application, the first contact portion (22) is contacted to the first housing wall (11) through riveting. For example, the shape of the through portion (21) and the second contact portion (23) of the electrode column (2) corresponds to the first housing wall (11) before and after assembly, but the shape of the first contact portion (22) changes before and after assembly. After mounting the electrode column (2) into the mounting hole (12) through the through portion (21), the second contact portion (23) is contacted to the first housing wall (11), and the first contact portion (22) is manufactured using a flange riveting process, thereby realizing the contact between the first contact portion (22) and the first housing wall (11). Accordingly, the assembly of the electrode column (2) and the first housing wall (11) is convenient, and the contact is reliable.

[0071] Referring again to FIGS. 7 through 9, the battery cell (102) further comprises a sealed insulating assembly (3) insulatingly coupled between the electrode column (2) and the first housing wall (11), that is, at least a portion of the sealed insulating assembly (3) is sandwiched between the first housing wall (11) and the electrode column (2) so that the electrode column (2) and the first housing wall (11) are indirectly coupled through the sealed insulating assembly (3), thereby providing insulation and sealing between the first housing wall (11) and the electrode column (2). Here, the sealing insulation assembly (3) includes a first insulation member (31) and a second insulation member (32), at least a portion of the first insulation member (31) is installed between the first contact portion (22) and the first housing wall (11) to provide insulation between the first contact portion (22) and the first housing wall (11), and at least a portion of the second insulation member (32) is installed between the second contact portion (23) and the first housing wall (11) to provide insulation between the second contact portion (23) and the first housing wall (11).

[0072] In an embodiment of the present application, the elastic modulus of the first insulating member (31) is less than or equal to the elastic modulus of the second insulating member (32), and the first insulating member (31) is elastically compressed between the first contact portion (22) and the first housing wall (11) to seal the space between the first contact portion (22) and the first housing wall (11). Since the first contact portion (22) and the first housing wall (11) are sealed together, it can be understood that the requirement for the space between the electrode column (2) and the first housing wall (11) to be sealed through the sealing insulating assembly (3) can be satisfied, whether or not the space between the second contact portion (23) and the first housing wall (11) is sealed.

[0073] Since the first insulating member (31) can be made of an electrolyte-resistant material, when the first insulating member (31) is elastically compressed between the first joint (22) and the first housing wall (11) to seal the space between the first joint (22) and the first housing wall (11), it can be understood that the problem of the electrolyte inside the housing (1) leaking from the connection part can be effectively improved by forming a sealing surface.

[0074] In an embodiment of the present application, when an electrode column (2) is riveted to a first housing wall (11), the deformed first joint (22) applies a force to the first insulating member (31). Since the elastic modulus of the first insulating member (31) is smaller than or equal to the elastic modulus of the second insulating member (32), the first insulating member (31) has a relatively stronger deformation capacity or relatively smaller rigidity compared to the second insulating member (32). Therefore, the first insulating member (31) can absorb the force applied to the first joint (22) deformed by riveting through deformation, thereby reducing the risk of cracking of the first insulating member (31), which is advantageous for improving the sealing reliability between the first housing wall (11) and the electrode column (2) and improving the reliability of the battery cell (102).

[0075] In addition, if the elastic modulus of the second insulating member (32) is greater than the elastic modulus of the second insulating member (32), the second insulating member (32) has greater rigidity than the first insulating member (31) and can perform a supporting role to some extent, thereby making it easier to control the overall compression ratio of the sealing insulating assembly (3), so that the difficulty of processing and production and production efficiency can be lowered and production efficiency improved under the premise of securing the sealing requirement between the electrode column (2) and the first housing wall (11).

[0076] In some embodiments of the present application, referring again to FIGS. 7 and FIGS. 8, the first insulating member (31) comprises a first main body portion (311) and a first extension portion (312), the first main body portion (311) is located on one side of the first contact portion (22) facing the first housing wall (11), the first extension portion (312) is connected to the first main body portion (311), and the first extension portion (312) protrudes in a direction away from the first housing wall (11) relative to the first main body portion (311) and stops at one side of the first contact portion (22) away from the center axis line (L) of the mounting hole (12).

[0077] In the above technical method, since a short circuit problem can easily occur when a metal wire is formed during the riveting process and overflows from the edge of the first joint (22) and comes into contact with the first housing wall (11), the reliability of the battery cell (102) can be further improved by installing a first extension (312) in the overflow path to block it, thereby reducing the risk of a short circuit caused by the metal wire overflow.

[0078] In some embodiments of the present application, referring again to FIGS. 7 and FIGS. 8, the first insulating member (31) comprises a first main body portion (311) and a second extension portion (313), the first main body portion (311) is located on one side of the first contact portion (22) facing the first housing wall (11), and the second extension portion (313) is connected to the first main body portion (311) and extends into the mounting hole (12).

[0079] In the above technical method, the first insulating member (31) includes a second extension (313) that extends into the mounting hole (12). By using the second extension (313), the hole wall of the mounting hole (12) and the penetration part (21) can be insulatingly blocked, thereby further reducing the risk of a short circuit between the electrode column (2) and the housing (1), and reducing the difficulty of insulating between the penetration part (21) and the housing (1), thus reducing the use of the insulating member. Additionally, since the first insulating member (31) includes a second extension (313) that extends into the mounting hole (12), when assembling the first insulating member (31) to the first housing wall (11), the second extension (313) can be used to perform an assembly position determination function, thereby improving the assembly efficiency of the first insulating member (31) and improving the assembly stability of the first insulating member (31), which is advantageous for the assembly of the electrode column (2).

[0080] For example, in the production process, the first insulating member (31) and the second insulating member (32) are each mounted on the first housing wall (11), and then the electrode column (2) is passed through the mounting hole (12), and then the electrode column (2) can be riveted. Since the first insulating member (31) and the first housing wall (11) are joined to the mounting hole (12) through the second extension (313), the relative positional stability of the first insulating member (31) and the first housing wall (11) can be improved, thereby reducing the probability that the first insulating member (31) will deviate from the mounting position when the electrode column (2) is subsequently passed through the mounting hole (12), and thus increasing the assembly success rate.

[0081] In some embodiments of the present application, referring again to FIG. 8, a first corner (314) is formed in the connection portion between the second extension portion (313) and the first main body portion (311) and is installed toward the first housing wall (11), and the first housing wall (11) includes a second corner (111) installed corresponding to the first corner (314), and the first corner (314) is formed as a chamfer, wherein the chamfer may be a round chamfer or an inclined chamfer.

[0082] In the above technical method, when assembling the electrode column (2) to the first housing wall (11), the second corner (111) presses against the first corner (314), and since the first insulating member (31) is prone to cracking at the location of the first corner (314), if the first corner (314) is installed in a chamfered shape, the area of ​​force received by the first corner (314) when the second corner (111) applies force to the first corner (314) is increased, thereby dispersing the force received at the location of the first corner (314), and thus reducing the risk of cracking in the first insulating member (31) at the location of the first corner (314).

[0083] In some embodiments of the present application, referring again to FIG. 8, a first corner (314) is formed in the connection portion between the second extension portion (313) and the first main body portion (311) and is installed toward the first housing wall (11), and the first housing wall (11) includes a second corner (111) installed corresponding to the first corner (314), and the second corner (111) is formed as a chamfer, wherein the chamfer may be a round chamfer or an inclined chamfer.

[0084] In the above technical method, when assembling the electrode column (2) to the first housing wall (11), the second corner (111) compresses the first corner (314), and the first insulating member (31) is prone to cracking at the location of the first corner (314). Therefore, if the second corner (111) is installed in a chamfered shape, the area of ​​force applied by the second corner (111) to the first corner (314) can be increased to disperse the location where the force is applied, thereby reducing the concentrated compression of the location of the first corner (314) by the applied force and reducing the risk of cracking at the location of the first insulating member (31) at the location of the first corner (314).

[0085] In some embodiments of the present application, referring again to FIG. 8, a first corner (314) is formed in the connection portion between the second extension portion (313) and the first main body portion (311) and is installed toward the first housing wall (11), and the first housing wall (11) includes a second corner (111) installed corresponding to the first corner (314), the first corner (314) is formed as a rounded chamfer or an inclined chamfer, and the second corner (111) is formed as a rounded chamfer or an inclined chamfer.

[0086] In the above technical method, when assembling the electrode column (2) to the first housing wall (11), the second corner (111) compresses the first corner (314), and since the first insulating member (31) is prone to cracking at the location of the first corner (314), if both the first corner (314) and the second corner (111) are installed in a chamfered shape, the area of ​​force applied by the second corner (111) to the first corner (314) can be increased to disperse the location where the force is applied, thereby reducing the concentrated compression of the location of the first corner (314) by the applied force, and the area of ​​force received by the first corner (314) when the second corner (111) applies force to the first corner (314) can be increased to disperse the force received at the location of the first corner (314), thereby reducing the risk of cracking at the location of the first insulating member (31) in these two aspects.

[0087] In some embodiments of the present application, referring again to FIG. 8, regardless of whether at least one of the second corner (111) and the first corner (314) is processed into a chamfered shape, the second corner (111) and the first corner (314) can be installed to have a coupling gap between them, thereby reducing the compression of the second corner (111) against the first corner (314) to some extent, thus reducing the risk of the first insulating member (31) cracking at the location of the first corner (314).

[0088] In some embodiments of the present application, referring again to FIG. 8, the second insulating member (32) comprises a second main body portion (321) and a third extension portion (322), the second main body portion (321) is located on one side of the second contact portion (23) facing the first housing wall (11), and the third extension portion (322) is connected to the second main body portion (321) and extends into the mounting hole (12).

[0089] In the above technical method, the second insulating member (32) includes a third extension (322) that extends into the mounting hole (12). By using the third extension (322), the hole wall of the mounting hole (12) and the penetration part (21) can be insulatingly blocked, thereby further reducing the risk of a short circuit between the electrode column (2) and the housing (1), and reducing the difficulty of insulating between the penetration part (21) and the housing (1), thus reducing the use of the insulating member. Additionally, since the second insulating member (32) includes a third extension (322) that extends into the mounting hole (12), when assembling the second insulating member (32) to the first housing wall (11), the third extension (322) can be used to perform an assembly position determination function, thereby improving the assembly efficiency of the second insulating member (32) and improving the assembly stability of the second insulating member (32), which is advantageous for the assembly of the electrode column (2).

[0090] For example, in the production process, the first insulating member (31) and the second insulating member (32) are each mounted on the first housing wall (11), and then the electrode column (2) is passed through the mounting hole (12), and then the electrode column (2) can be riveted. Since the second insulating member (32) and the first housing wall (11) are joined to the mounting hole (12) through the third extension (322), the relative positional stability of the second insulating member (32) and the first housing wall (11) can be improved, thereby reducing the probability that the second insulating member (32) will deviate from the mounting position when the electrode column (2) is subsequently passed through the mounting hole (12), and thus increasing the assembly success rate.

[0091] FIG. 10 is a partial cross-sectional view of a battery cell (102) according to some embodiment of the present application. In some embodiment of the present application, referring to FIG. 10, a second contact portion (23) is installed inside the first housing wall (11), and a second insulating member (32) includes a second main body portion (321) and a fourth extension portion (323). The second main body portion (321) is located on one side of the second contact portion (23) facing the first housing wall (11), and the fourth extension portion (323) is connected to one side of the second main body portion (321) moving away from the electrode column (2) and is installed with a gap between the first housing wall (11) and the active material coating portion (41) located inside the first housing wall (11).

[0092] In the above technical method, since the second insulating member (32) has a wide range, it can not only serve to insulate between the second contact portion (23) and the first housing (1), but also serve to insulate between the first housing wall (11) and the active material coating portion (41), thereby simplifying the structure of the battery cell (102), reducing production costs, and improving production efficiency.

[0093] In the related technology, an insulating support must be installed between the active material coating portion and the first housing wall. This is equivalent to integrating the second insulating member and the insulating support as a single unit in the above-mentioned technology, thereby saving parts, improving assembly efficiency, and reducing production costs. Additionally, the cost of the electrode column (2) can be reduced by decreasing the radial extension dimension (W2) of the second contact portion (23) in the mounting hole (12), and at the same time, the pressure resistance of the electrode column (2) can be improved by reducing the surface area of ​​the electrode column (2).

[0094] Of course, the present application is not limited thereto, and for example, in another embodiment of the present application, when looking at FIG. 8 again, the second insulating member (32) may not include the fourth extension (323), in which case an insulating support (33) installed separately from the second insulating member (32) can perform an insulating role between the first housing wall (11) and the active material coating part (41).

[0095] In some embodiments of the present application, the second insulating member (32) is elastically compressed between the second bonding portion (23) and the first housing wall (11) to seal the space between the second bonding portion (23) and the first housing wall (11).

[0096] In the above technical method, since the second insulating member (32) also has elastic deformation capability, sealing between the second contact portion (23) and the first housing wall (11) can be achieved through elastic compression. In this way, not only is sealing between the first contact portion (22) and the first housing wall (11) achieved through elastic compression of the first insulating member (31), but sealing between the second contact portion (23) and the first housing wall (11) can also be achieved through elastic compression of the second insulating member (32), thereby further enhancing the sealing effect of the sealing insulating assembly (3) between the first housing wall (11) and the electrode column (2).

[0097] It should be noted that regardless of whether the second insulating member (32) includes a fourth extension (323), the second insulating member (32) may have elastic deformation capability and be installed to be elastically compressed between the second contact portion (23) and the first housing wall (11).

[0098] In some embodiments of the present application, when a second insulating member (32) is elastically compressed between the second bonding portion (23) and the first housing wall (11) to seal the space between the second bonding portion (23) and the first housing wall (11), if the elastic modulus of the second insulating member (32) is equal to the elastic modulus of the first insulating member (31), the second insulating member (32) and the first insulating member (31) can be made of the same material, thereby reducing the difficulty of production. If the elastic modulus of the second insulating member (32) is greater than the elastic modulus of the first insulating member (31), the problem of cracking of the first insulating member (31) can be effectively improved, and it is advantageous to reduce the difficulty of controlling the compression ratio of the sealed insulating assembly (3).

[0099] In some embodiments of the present application, the elastic modulus of the first insulating member (31) is 6 MPa or less, and the compression ratio of the first insulating member (31) is 10% to 50%. For example, the elastic modulus of the first insulating member (31) is 4 MPa, 5 MPa, 6 MPa, etc., and the compression ratio of the first insulating member (31) is 10%, 20%, 30%, 40%, 50%, etc. As verified by experiments, by setting the elastic modulus of the first insulating member (31) to 6 MPa or less and setting the compression ratio of the first insulating member (31) to 10% to 50%, no cracking problem occurs when riveting the electrode column (2). If the elastic modulus of the first insulating member (31) is set to be greater than 6 MPa and the compression ratio of the first insulating member (31) is set to be less than 10%, cracks are likely to occur in the first insulating member (31) when riveting the electrode column (2).

[0100] For example, when the elastic modulus of the first insulating member (31) is 6 MPa or less, the compression ratio of the first insulating member (31) can be set to 32% to 38%, for example, 32%, 35%, 38%, etc., so that not only can the requirement for no cracking be satisfied, but a good sealing effect can also be satisfied.

[0101] Regarding materials, it should be noted that the elastic modulus is the ratio of deformation to stress that occurs when a force is applied to the material, signifying the degree of elastic deformation. For example, in the case of rubber materials, the elastic modulus indicates the degree of deformation when the material is subjected to force; a smaller elastic modulus implies greater elasticity and a higher deformation capacity, while a larger elastic modulus implies a lower deformation capacity. Rubber materials deform to a certain extent when subjected to force. Compression ratio refers to the amount of deformation that occurs when a material is subjected to pressure. Due to their specific structure and properties, rubber materials exhibit a wide range of variation in compression ratio. Generally, a higher elastic modulus corresponds to a lower compression ratio. Therefore, during the production and application of rubber products, the required performance can be achieved by controlling the elastic modulus and compression ratio of the rubber material according to various demands.

[0102] In some embodiments of the present application, the material of the first insulating member (31) is not limited. For example, soft rubber may be used, and since the material of soft rubber is relatively soft, it is advantageous for improving cracking problems during the riveting process. For example, the material of the first insulating member (31) may include one of fluororubber, perfluoroalkylate, polypropylene (PP), and ethylene propylene diene monomer (i.e., EPDM). Thus, the material of the first insulating member is simple, universal, and easy to mass-produce. In related technology, PPS (i.e., polyphenylene sulfide, a novel high-performance thermoplastic resin) is commonly used in the position of the first insulating member, and its elastic modulus is about 20 GPa, which is much greater than the stiffness of the first insulating member (31) of the present embodiment, which has an elastic modulus of 6 MPa or less, but there is a risk of cracking.

[0103] For example, when the first insulating member (31) is manufactured using FKM (i.e., fluororubber) or PFA (i.e., perfluoroalkylate), it has been verified through experiments that no cracking problem occurs when riveting the electrode column (2), because these two materials not only have resistance to the electrolyte, but also have a corresponding compression ratio of 10% to 50% and an elastic modulus of about 6 MPa.

[0104] It can be understood that sealing reliability requirements can be met by controlling the riveting stroke of the first contact portion (22) of the electrode column (2) so that the compression ratio of the first insulating member (31) meets the requirements. The wall thickness of the first main body portion (311) of the first insulating member (31) is X, and the thickness after riveting changes to Y, where the compression ratio is (XY) / Y, for example, if X is 1.1 mm and Y is 0.7 mm, the compression ratio is (1.1-0.7) / 1.1 It can be understood that it is 36%.

[0105] Additionally, when the elastic modulus of the second insulating member (32) and the first insulating member (31) match, the two may use the same material or different materials. When the elastic modulus of the second insulating member (32) is greater than that of the first insulating member (31), the second insulating member (32) may use PPS (i.e., polyphenylene sulfide, a novel high-performance thermoplastic resin) or LCP (i.e., liquid crystal polymer), thereby allowing the second insulating member (32) to have high rigidity and act as a support, so that the compression ratio of the sealing insulating assembly (3) can be better controlled and the sealing performance can be improved.

[0106] In some embodiments of the present application, referring to FIG. 8, in the radial direction of the mounting hole (12), the line connecting the center of the mounting hole (12) and any point on the edge of the mounting hole (12) is in the radial direction, and the extension dimension (W2) of the second joint (23) is greater than or equal to the extension dimension (W1) of the first joint (22), that is, W2 ≥ W1.

[0107] In the above technical method, when the first joint (22) is processed through a riveting process, the extension dimension (W2) of the second joint (23) is greater than or equal to the extension dimension (W1) of the first joint (22), so the second joint (23) can be reliably joined to the first housing wall (11) and is not easily detached from the mounting hole (12), thereby facilitating the smooth progress of riveting and ensuring that the first joint (22) is properly riveted, thereby improving the bonding stability with the first housing (1) after riveting the electrode column (2).

[0108] In some embodiments of the present application, with reference to FIG. 8, the first contact portion (22) is contacted to the outside of the first housing wall (11), and the second contact portion (23) is contacted to the inside of the first housing wall (11). Here, "inside" is one side of the first housing wall (11) facing the receiving cavity (10), and the opposite side is "outside," that is, one side away from the receiving cavity (10).

[0109] In the above technical method, the first contact portion (22) is contacted to the outside of the first housing wall (11), and the first insulating member (31) is mounted to the outside of the first housing wall (11) so that at least a portion of it can be exposed to the outside of the first housing wall (11). Therefore, the mounting status of the first insulating member (31) can be directly observed from the outside of the first housing wall (11), and the omission of the first insulating member (31) can be detected without the need for a gas leak inspection process, which is advantageous for improving the production efficiency of the battery cell (102).

[0110] In some embodiments of the present application, as illustrated in FIG. 11, a battery cell (102) has a receiving cavity (10) formed inside a first housing wall (11), and an electrode column (2) has a receiving groove (24) formed that is open in a direction away from the receiving cavity (10). The electrode column (2) is provided with a communication hole (25), and the communication hole (25) penetrates one side of the receiving groove (24) near the receiving cavity (10) to communicate with the receiving cavity (10) and the receiving groove (24). For example, if the through-hole (21) is annular, the receiving groove (24) is located in the inner annular region of the through-hole (21), and for example, the through-hole (21) and the support member (26) located in the inner annular region of the through-hole (21) can together define the receiving groove (24).

[0111] Accordingly, when an electrolyte is injected into the battery cell (102), the electrolyte can be injected into the receiving groove (24) and then flow into the receiving cavity (10) through the connecting hole (25). Here, the receiving groove (24) can serve to buffer and store the electrolyte, thereby improving the problem of the electrolyte splashing or overflowing. Additionally, the side wall of the receiving groove (24) (i.e., the groove wall extending from the opening of the receiving groove (24) toward the receiving cavity (10)) prevents the electrolyte from splashing to some extent, thereby reducing contamination of the electrolyte into the external environment and facilitating rapid injection. Furthermore, since there is no need to open and install a separate liquid injection channel in the housing (1), special processing is not required on the housing (1), which is advantageous for reducing the structural complexity and processing difficulty of the housing (1).

[0112] In some embodiments of the present application, as illustrated in FIG. 11, a battery cell (102) comprises a battery cell assembly (4), the battery cell assembly (4) comprises an active material coating portion (41) received in a receiving cavity (10), and a conductive portion (42) connected to the active material coating portion (41), and the conductive portion (42) passes through a communication hole (25) and is at least partially received in a receiving groove (24).

[0113] It should be noted that there may be one or more communication holes (25), and the conductive part (42) may pass through at least one of the communication holes (25). For example, at least one communication hole (25) may pass electrolyte, and for example, at least one communication hole (25) may be empty (i.e., the conductive part (42) may not pass through it), so that electrolyte may pass through without hindrance to the conductive part (42), and for example, at least one communication hole (25) may still pass electrolyte even after the conductive part (42) has passed through it.

[0114] Accordingly, by accommodating at least a portion of the conductive part (42) within the receiving groove (24) so ​​that at least a portion of the conductive part (42) occupies space within the receiving groove (24), the space occupied by the conductive part (42) within the receiving cavity (10) is reduced, thereby saving space within the receiving cavity (10) and allowing a larger volume of active material coating part (41) to be accommodated, which is advantageous for improving the energy density of the battery cell (102) or reducing the size of the battery cell (102) without changing the energy density of the battery cell (102).

[0115] In some embodiments, the conductive part (42) and the electrode column (2) are welded and electrically connected so that the battery cell assembly (4) is output from the electrode of the electrode column (2). For example, as shown in FIG. 11, the conductive part (42) is welded to one side of the groove wall of the receiving groove (24) near the receiving cavity (10), thereby improving the bonding tightness and facilitating the welding operation between the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive part (42) may be installed to form an electrical connection by being welded to the cover plate (5), but is not limited thereto.

[0116] In some embodiments, as illustrated in FIG. 12, the battery cell (102) includes a cover plate (5) covering a receiving groove (24), and the cover plate (5) has a liquid injection hole (51) formed therein that communicates with the receiving groove (24), and the battery cell (102) further includes a sealing structure (6) for sealing the liquid injection hole (51). Thus, when it is necessary to inject an electrolyte into the battery cell (102), the sealing structure (6) is not installed in the liquid injection hole (51), or the sealing structure (6) is in a state where the liquid injection hole (51) is open, and the electrolyte can be injected into the receiving groove (24) through the liquid injection hole (51). In addition, after injecting the liquid, a sealing structure (6) is installed in the liquid injection hole (51), or the sealing structure (6) is switched to a closed state so that the liquid injection hole (51) is sealed and closed to prevent the electrolyte from overflowing and to prevent external foreign substances from entering the receiving cavity (10) from the liquid injection hole (51), thereby improving the reliability of the battery cell (102).

[0117] Accordingly, by processing the liquid injection hole (51) in the cover plate (5), the opening is relatively small and located externally, so that reliable sealing of the liquid injection port can be achieved relatively easily through the sealing structure (6), thereby improving the operational reliability of the battery cell (102) and enabling flexible and diverse designs of the sealing structure (6).

[0118] In some embodiments, as shown in FIG. 12, the cover plate (5) has no stopping portion on the outer side of the sealing structure (6) (i.e., one side away from the receiving cavity (10)), so the sealing structure (6) is suitable for mounting on the cover plate (5) from the outer side of the cover plate (5) (i.e., one side away from the receiving cavity (10)). Thus, the sealing structure (6) is installed to be mounted on the cover plate (5) from the outer side of the cover plate (5) to seal the liquid injection hole (51), thereby ensuring the sealability of the liquid injection hole (51) by mounting the sealing structure (6) after liquid injection, and since the mounting position is close to the outer side, it facilitates the rapid assembly of the sealing structure (6). In addition, mounting the sealing structure (6) does not have a negative effect on the connection between the electrode column (2) and the cover plate (5), thereby ensuring the reliability of the connection between the cover plate (5) and the electrode column (2).

[0119] Here, the sealing structure (6) may be in a detachable form or in a fixed form that is not detachable. For example, if the sealing structure (6) is in a detachable form, it is advantageous for maintenance of the liquid injection hole (51). For example, when the electrolyte needs to be replenished, the sealing structure (6) is detached, the liquid injection hole (51) is opened, and the electrolyte is injected into the receiving cavity (10) through the liquid injection hole (51) to replenish it, and then the sealing structure (6) is reassembled. For example, the sealing structure (6) can be detachably connected to the cover plate (5) using a method such as a screw thread or a turnbuckle, making disassembly and assembly easy.

[0120] For example, if the sealing structure (6) is in a non-removable fixed form, the sealing structure (6) can be fixed to the cover plate (5) using methods such as welding or riveting, thereby improving the sealing reliability of the sealing structure (6) for the liquid injection hole (51). For example, the liquid injection hole (51) may be in a multi-stage form, and the sealing structure (6) may include a first sealing member (61) that is press-fitted to the liquid injection hole (51), and a second sealing member (62) that covers the first sealing member (61) and is welded to the cover plate (5). Alternatively, in some embodiments, the second sealing member (62) may be installed so as to be detachably connected to the cover plate (5) via a turnbuckle method to restrict the first sealing member (61) to a position that is press-fitted to the liquid injection hole (51).

[0121] In some embodiments of the present application, as shown in FIG. 12, at least a portion of the sealing structure (6) is inserted into the liquid injection hole (51). That is, the sealing structure (6) may be fully inserted into the liquid injection hole (51), or only a portion of the sealing structure (6) may be inserted into the liquid injection hole (51). Thus, on the one hand, the sealing reliability of the sealing structure (6) for the liquid injection hole (51) can be improved by fully utilizing the space within the liquid injection hole (51), and on the other hand, the height of the sealing structure (6) protruding out of the liquid injection hole (51) can be reduced so that the sealing structure (6) occupies space other than the cover plate (5), thereby reducing interference with the bus member and increasing the connection area between the bus member and the cover plate (5), which is advantageous for improving flow efficiency.

[0122] In some embodiments of the present application, the first housing wall (11) is a cover plate (5) formed integrally, or the housing (1) further comprises a second housing wall (13), the first housing wall (11) is formed integrally with at least one second housing wall (13), and the second housing wall (13) extends to one side in the thickness direction of the first housing wall (11). Accordingly, the structural position of the electrode column (2) can be flexibly designed to expand the range of application of the battery cell (102) according to the embodiments of the present application.

[0123] It should be noted that the second housing wall (13) may extend from the edge of the first housing wall (11), and if the first housing wall (11) is rectangular, at least one of the four edges of the first housing wall (11) may extend to the second housing wall (13). For example, the first housing wall (11) may have only one edge extending to the second housing wall (13), the first housing wall (11) may have only two edges extending to the second housing wall (13), the first housing wall (11) may have three edges each extending to the second housing wall (13), or all four edges of the first housing wall (11) may extend to the second housing wall (13). For example, if the housing (1) is a rectangular housing, any wall surface of the rectangular housing may be used as the first housing wall (11).

[0124] For example, the housing (1) may include a housing body and a cover plate (5), the housing body defines a space with one side open, and the cover plate (5) is installed on the open side of the housing body to form a receiving cavity (10) between the housing body and the cover plate (5). In this case, the surface of the housing body facing the cover plate (5) is a first housing wall (11), and the wall surface of the housing body connected between the first housing wall (11) and the cover plate (5) is a second housing wall (13), or the surface of the housing body facing the cover plate (5) is a second housing wall (13), and the wall surface of the housing body connected between the second housing wall (13) and the cover plate (5) is a first housing wall (11), and the cover plate (5) is a first housing wall (11). All of the above cases are possible.

[0125] According to an embodiment of the second aspect of the present application, the embodiment of the present application further provides a battery (100) comprising a battery cell (102) according to any one of the above methods. It should be noted that the battery (100) according to the embodiment of the present application may include a box body (101) or may not include a box body (101). Accordingly, since the reliability of the battery cell (102) according to the embodiment of the present application is improved, it is advantageous for improving the performance of the battery (100).

[0126] For example, the battery (100) may further include a bus member, and the battery cells (102) are multiple, with at least two being electrically connected through the bus member. Thus, a series and / or parallel connection of multiple battery cells (102) can be implemented. For example, when multiple battery cells (102) are connected in series, the positive cover plate (5) of one battery cell (102) is connected to the negative cover plate (5) of the next battery cell (102) through one bus member, and at the same time, the negative cover plate (5) of the battery cell (102) is connected to the positive cover plate (5) of the previous battery cell (102) through another bus member.

[0127] According to an embodiment of the third aspect of the present application, the embodiment of the present application further provides an electric device comprising a battery (100) according to any one of the above methods, wherein the battery (100) provides electric energy to the electric device. The electric device may be any device or system that applies the aforementioned battery (100). Since the performance of the battery (100) is improved, it is advantageous to improve the operating electrical performance of the electric device.

[0128] Below, a battery cell (102) according to a specific embodiment of the present application is described.

[0129] A battery cell (102) comprises a housing (1), an electrode column (2), and a sealing insulation assembly (3). A first housing wall (11) of the housing (1) is provided with a mounting hole (12). The electrode column (2) includes a through-hole (21) penetrating the mounting hole (12), and a first contact portion (22) and a second contact portion (23) connected to the through-hole (21) and contacted to both sides of the first housing wall (11). The first contact portion (22) is contacted to the outside of the first housing wall (11), and the second contact portion (23) is contacted to the inside of the first housing wall (11). The first contact portion (22) is contacted to the first housing wall through riveting. The sealed insulation assembly (3) is insulatingly coupled between the electrode column (2) and the first housing wall (11) and includes a first insulating member (31) installed at least partially between the first contact portion (22) and the first housing wall (11), and a second insulating member (32) installed at least partially between the second contact portion (23) and the first housing wall (11).

[0130] The first insulating member (31) includes a first main body part (311), a first extension part (312), and a second extension part (313). The first main body part (311) is located on one side of the first contact part (22) facing the first housing wall (11), and the first extension part (312) is connected to the first main body part (311) and protrudes in a direction away from the first housing wall (11) relative to the first main body part (311), and stops at one side of the first contact part (22) away from the center axis line (L) of the mounting hole (12), and the second extension part (313) is connected to the first main body part (311) and extends into the mounting hole (12). The second insulating member (32) includes a second main body part (321) and a third extension part (322), the second main body part (321) is located on one side of the second contact part (23) facing the first housing wall (11), and the third extension part (322) is connected to the second main body part (321) and extends into the mounting hole (12).

[0131] The elastic modulus of the first insulating member (31) is smaller than the elastic modulus of the second insulating member (32), and the first insulating member (31) is elastically compressed between the first bonding portion (22) and the first housing wall (11) to seal the space between the first bonding portion (22) and the first housing wall (11). In the above technical method, when an electrode column (2) is riveted to the first housing wall (11), the deformed first joint (22) applies a force to the first insulating member (31). Since the elastic modulus of the first insulating member (31) is smaller than or equal to the elastic modulus of the second insulating member (32), the first insulating member (31) has a relatively stronger deformation capacity or relatively smaller rigidity compared to the second insulating member (32). Therefore, the first insulating member (31) can absorb the force applied to the first joint (22) deformed by riveting through deformation, thereby reducing the risk of cracking of the first insulating member (31), which is advantageous for improving the sealing reliability between the first housing wall (11) and the electrode column (2) and improving the reliability of the battery cell (102).

[0132] It should be noted that the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

[0133] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the application; a person skilled in the art may make various modifications and changes to the present application. All modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present application are included within the scope of protection of the present application. Explanation of the symbols

[0134] Vehicle (1000); 1st direction (X); 2nd direction (Y); 3rd direction (Z); Battery (100); Controller (200); Motor (300); Box body (101); 1st box body (1011); 2nd box body (1012); Battery cell (102); Housing (1); Receiving cavity (10); 1st housing wall (11); 2nd corner (111); Mounting hole (12); Center axis line (L); 2nd housing wall (13); Electrode column (2); Penetration part (21); 1st contact part (22); 2nd contact part (23); Receiving groove (24); Communication hole (25); Support part (26); Sealing insulation assembly (3); 1st insulating member (31); 1st main body part (311); 1st extension part (312); 2nd extension part (313); 1st corner (314); 2nd insulating member (32); 2nd main body part (321); Third extension (322); fourth extension (323); insulating support (33); battery cell assembly (4); active material coating part (41); conductive part (42); cover plate (5); liquid injection hole (51); sealing structure (6); first sealing member (61); second sealing member (62).

Claims

Claim 1 A battery cell comprising: a first housing wall having a mounting hole; a penetration portion penetrating the mounting hole, a first contact portion and a second contact portion connected to the penetration portion and contacted to both sides of the first housing wall, wherein the first contact portion contacts the first housing wall through riveting; a sealing insulation assembly comprising a first insulating member insulatedly coupled between the electrode column and the first housing wall and installed at least partially between the first contact portion and the first housing wall, and a second insulating member installed at least partially between the second contact portion and the first housing wall, wherein the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, and the first insulating member is elastically compressed between the first contact portion and the first housing wall to seal the first contact portion and the first housing wall. Claim 2 A battery cell according to claim 1, wherein the first insulating member comprises a first main body portion and a first extension portion, the first main body portion is located on one side of the first contact portion facing the first housing wall, the first extension portion is connected to the first main body portion and protrudes in a direction away from the first housing wall relative to the first main body portion, and stops at one side of the first contact portion away from the center axis of the mounting hole. Claim 3 A battery cell according to claim 1 or 2, wherein the first insulating member comprises a first main body portion and a second extension portion, the first main body portion is located on one side of the first contact portion facing the first housing wall, and the second extension portion is connected to the first main body portion and extends into the mounting hole. Claim 4 A battery cell according to paragraph 3, wherein a first corner installed toward the first housing wall is formed at the connection portion of the second extension portion and the first main body portion, and the first corner is formed as a chamfer. Claim 5 A battery cell according to claim 3 or 4, wherein a first corner installed toward the first housing wall is formed at the connection portion of the second extension portion and the first main body portion, and the first housing wall includes a second corner installed corresponding to the first corner, and the second corner is formed as a chamfer. Claim 6 A battery cell according to any one of claims 1 to 5, wherein the second insulating member comprises: a second main body portion located on one side of the second contact portion facing the first housing wall; and a third extension portion connected to the second main body portion and extending into the mounting hole. Claim 7 A battery cell according to any one of claims 1 to 6, wherein the second contact portion is installed on the inner side of the first housing wall, and the second insulating member comprises: a second main body portion located on one side of the second contact portion facing the first housing wall; and a fourth extension portion connected to one side of the second main body portion moving away from the electrode column and installed with a gap between the first housing wall and the active material coating portion located on the inner side of the first housing wall. Claim 8 A battery cell according to any one of claims 1 to 7, wherein the second insulating member is elastically compressed between the second contact portion and the first housing wall to seal between the second contact portion and the first housing wall. Claim 9 A battery cell according to any one of claims 1 to 8, wherein the elastic modulus of the first insulating member is 6 MPa or less and the compressibility of the first insulating member is 10% to 50%. Claim 10 A battery cell according to claim 9, wherein the compression ratio of the first insulating member is 32% to 38%. Claim 11 A battery cell according to any one of claims 1 to 10, wherein the material of the first insulating member comprises one of fluororubber, perfluoroalkylate, polypropylene, and ethylene propylene diene monomer. Claim 12 A battery cell according to any one of claims 1 to 11, wherein, in the radial direction of the mounting hole, the extension dimension of the second contact portion is greater than or equal to the extension dimension of the first contact portion. Claim 13 A battery cell according to any one of claims 1 to 12, wherein the first contact portion is in contact with the outside of the first housing wall and the second contact portion is in contact with the inside of the first housing wall. Claim 14 A battery cell according to any one of claims 1 to 13, wherein the battery cell has a receiving cavity formed on the inner side of the first housing wall, a receiving groove formed in the electrode column that is open in a direction away from the receiving cavity, and a communication hole provided in the electrode column, wherein the communication hole penetrates the groove wall on one side of the receiving groove close to the receiving cavity and communicates the receiving cavity and the receiving groove. Claim 15 In claim 14, the battery cell comprises a battery cell assembly, wherein the battery cell assembly comprises an active material coating portion received in the receiving cavity and a conductive portion connected to the active material coating portion, and wherein the conductive portion penetrates the communication hole and is at least partially received in the receiving groove. Claim 16 A battery cell according to claim 14 or 15, wherein the battery cell comprises a cover plate covering the receiving groove, and the cover plate has a liquid injection hole formed therein that communicates with the receiving groove, and the battery cell further comprises a sealing structure for sealing the liquid injection hole. Claim 17 A battery comprising a battery cell according to any one of paragraphs 1 to 16. Claim 18 An electric device including a battery according to paragraph 17.

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