Battery cells, batteries and electrical devices

Abstract

The battery cell, battery, and electrical device are related to the technical field of batteries. The battery cell includes a casing assembly and a battery core assembly. The casing assembly includes a casing with mounting holes and a first pole mounted in the mounting hole. The battery core assembly includes an active material coated portion provided in the casing and a conductive portion electrically connecting the active material coated portion and the first pole. The first pole includes a first pole portion and a second pole portion molded separately, at least a portion of the first pole portion is fitted outside the casing, at least a portion of the second pole portion is fitted inside the casing, and the second pole portion is connected to the conductive portion.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is filed based on a Chinese patent application bearing application number 202321132714.9 and filed on May 11, 2023, and claims priority to the above-mentioned Chinese patent application, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, and more particularly to battery cells, batteries, and electrical devices. [Background technology]

[0003] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, batteries play an irreplaceable and important role as the power source of electric vehicles. Typically, a battery includes a plurality of battery cells, each of which includes a casing and a battery core assembly housed in the casing, and poles electrically connected to the battery core assembly are riveted to the casing, and the poles are electrically connected to bus members outside the casing to realize the electrical connection between the plurality of battery cells. However, there are limitations to the application of such poles. Summary of the Invention [Means for solving the problem]

[0004] The embodiments of the present application provide a battery cell, a battery, and an electric device that are advantageous in improving the design versatility of the battery cell by improving the design versatility of the first pole and enriching the application scenarios of the first pole.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell including a casing assembly and a battery core assembly, the casing assembly including a casing having mounting holes and a first pole drilled in the mounting hole, the battery core assembly including an active material application portion provided in the casing and a conductive portion electrically connecting the active material application portion and the first pole, wherein the first pole includes a first pole portion and a second pole portion molded separately and connected and installed, at least a portion of the first pole portion is engaged outside the casing, at least a portion of the second pole portion is engaged inside the casing, and the second pole portion is connected to the conductive portion.

[0006] In the above technical solution, the first pole is configured to include a first pole portion and a second pole portion that are formed separately. At least a portion of the first pole portion is engaged outside the casing, and at least a portion of the second pole portion is engaged inside the casing, and the second pole portion is connected to the conductive portion. This allows the structural shapes and materials of the first pole portion and the second pole portion to be designed and selected independently, which is advantageous for improving the design diversity of the first pole and expanding the application scenarios of the first pole. Specifically, the structural shape and material of the second pole portion can be configured to be advantageous for connection to the conductive portion, and the structural shape and material of the first pole portion can be configured to be suitable for direct or indirect connection to the bus member. This allows the first pole to better meet the needs for good connection with both the conductive portion and the bus member. This therefore allows for more flexible design of the first pole and broadens the application scenarios, which is advantageous for improving the design diversity of battery cells.

[0007] In some embodiments, the second electrode pillar portion includes a first connection portion, a cavity is formed in the first electrode pillar on a side of the first connection portion away from the active material application portion and / or on a side of the first connection portion toward the active material application portion, at least a portion of the conductive portion is housed in the cavity and connected to the first connection portion, and the hardness of at least the first connection portion of the second electrode pillar portion is greater than the hardness of the first electrode pillar portion.

[0008] In the above technical solution, it is relatively difficult for the first connection portion and the cavity to reliably support the casing, making them relatively susceptible to deformation. The present application proposes that the hardness of at least the first connection portion of the second pole portion is greater than that of the first pole portion, thereby reducing deformation of the first connection portion to some extent, thereby improving the connection reliability between the first connection portion and the conductive portion and improving the conductivity yield. The first pole portion, which has a relatively low hardness, is advantageous for improving the yield of the electrical connection between the first pole portion and the bus member. Furthermore, by providing a cavity to accommodate at least a portion of the conductive portion, at least a portion of the conductive portion can occupy the space within the first pole, thereby reducing the space occupied by the conductive portion within the casing. This frees up space within the casing to accommodate a larger active material-coated portion, thereby improving the volumetric energy density of the battery cell.

[0009] In some embodiments, the second pole portion further includes a second connecting portion drilled in the mounting hole, the second connecting portion being formed in a ring-shaped structure arranged to surround the inner wall of the mounting hole, the first connecting portion being provided in the ring-shaped region of the second connecting portion and being connected to an inner end portion of the second connecting portion that is adjacent to the active material application portion, the second connecting portion together with the first connecting portion surrounding a cavity, the cavity being open in a direction away from the active material application portion, a through-hole formed in the first connecting portion that communicates with the cavity, and a portion of the conductive portion passing through the through-hole is accommodated in the cavity.

[0010] In the above technical solution, the second pole portion includes a second connecting portion drilled into the mounting hole, which facilitates assembly of the second pole portion and the casing. The annular second connecting portion and the first connecting portion connected to the inner end of the second connecting portion jointly define a cavity, which simplifies the structure of the second pole portion and increases the cavity's storage volume. Furthermore, because the cavity is open in the direction away from the active material-coated portion, a portion of the conductive portion can be inserted into the cavity through the through-hole of the first connecting portion, facilitating connection between the conductive portion and the first connecting portion from outside the casing, facilitating manufacture of the battery cell.

[0011] In some embodiments, the through-hole is provided at an edge location where the first connector and the second connector are connected.

[0012] In the above technical proposal, the through hole is installed at a position close to the second connection part of the first connection part, so that when at least a part of the conductive part inserted into the cavity is connected to the first connection part, the first connection part can have a relatively large area connected to the conductive part, and by increasing the connection area between the conductive part and the first connection part, it is advantageous for increasing the connection reliability and conductive area between the conductive part and the first connection part.

[0013] In some embodiments, the active material application portion includes a current collector and an active material layer provided on the current collector, the conductive portion includes a tab portion electrically connected to the current collector, the tab portion including a plurality of tab sheets, the plurality of tab sheets gathering at a position close to the current collector to form a first converging portion, and the plurality of tab sheets gathering at a position away from the current collector and connecting to form a second converging portion, the first converging portion connecting the second converging portion and the active material application portion, wherein the conductive portion is made of a tab portion, and at least a portion of the second converging portion passes through the through hole and is housed in the cavity, or the conductive portion includes a tab portion and an adapter sheet, and at least a portion of the adapter sheet passes through the through hole and is housed in the cavity, and the adapter sheet is connected between the second converging portion and the first connection portion.

[0014] In the above technical solution, if the conductive part is a tab part, the tab part may include a second converging part formed by gathering and connecting multiple tab sheets, which allows at least a portion of the second converging part to pass through the through hole and be easily accommodated in the cavity, and is advantageous in simplifying the configuration and processing of the conductive part. If the conductive part includes a tab part and an adapter sheet, using the adapter sheet to pass through the through hole makes it easier to operate, and using the adapter sheet to achieve an indirect electrical connection between the second converging part and the first connecting part allows the adapter sheet to be connected to the first connecting part through a portion that avoids the second converging part, which improves the reliability of the welding between the adapter sheet and the first connecting part, making the problem of weld cracking less likely to occur, and further improving the reliability and stability of the battery cell.

[0015] In some embodiments, the first pole portion is located outside the casing and has an annular structure, the second pole portion includes a second connecting portion drilled into the mounting hole, the second connecting portion is formed in an annular structure installed so as to surround the inner wall of the mounting hole, and one end of the second connecting portion remote from the active material application portion extends so as to be connected to the inner periphery of the first pole portion.

[0016] In the above technical solution, the first pole portion is located outside the casing and has a ring structure, and the second connecting portion is also a ring structure installed to surround the inner wall of the mounting hole, and its outer end can extend to the inner circumference of the first pole portion, thereby simplifying the structure of the first pole, reducing the number of parts, and improving processing production efficiency. Furthermore, because the first pole portion and the second connecting portion both have a ring structure, the first pole portion and the second connecting portion can be easily connected from the outside of the casing and the inner circumference of the first pole portion, reducing the difficulty of processing.

[0017] In some embodiments, the end of the second connection portion away from the active material application portion is the outer end, and the outer end extends to the side of the inner periphery that is close to the central axis of the mounting hole, and the inner surface of the inner periphery that faces the central axis of the mounting hole is welded to the outer surface of the outer end that faces away from the central axis of the mounting hole.

[0018] In the above technical solution, the weld seam between the inner surface of the inner circumferential portion and the outer surface of the outer end portion can be located on the outer surface away from the active material application portion of the first pole, so that it can be easily welded from the outside of the casing, which is advantageous in reducing the difficulty of welding and improving the welding yield.

[0019] In some embodiments, the casing assembly further includes a pole cover plate located outside the casing and covering the first pole portion, and the pole cover plate has a recess formed therein corresponding to the welding position between the outer end and the inner periphery to accommodate the welding mark.

[0020] In the above technical solution, the weld marks formed after welding the outer end and the inner periphery can be at least partially accommodated in the relief groove, thereby improving the interference between the weld marks and the pole cover plate. After welding the outer end and the inner periphery, the pole cover plate can be smoothly assembled to the first pole part, improving the compactness and reliability of the connection between the pole cover plate and the first pole part.

[0021] In some embodiments, the pole cover plate includes an inner fitting portion extending into the inner annular region of the second connection portion, and an outer peripheral surface of the inner fitting portion and an inner surface of the outer end portion are spaced apart to form a first gap.

[0022] In the above technical proposal, by setting the inner fitting portion so that there is a first gap between the outer peripheral surface and the outer end, the inner peripheral portion of the first pole portion and the outer end of the second pole portion are welded together, thereby reducing the inner dimension of the ring of the second connecting portion, thereby solving the problem that the pole cover plate cannot be attached to the first pole portion, and the pole cover plate can be smoothly attached after welding the outer end and inner peripheral portion together.

[0023] In some embodiments, the end of the second connection portion away from the active material application portion is the outer end, the inner peripheral portion abuts the side of the outer end away from the active material application portion, and the inner end surface of the inner peripheral portion facing the active material application portion is welded to the outer end surface of the outer end away from the active material application portion.

[0024] In the above technical solution, the weld seam between the inner end surface of the inner circumferential portion and the outer end surface of the outer end portion may be located in the inner ring region of the first pole portion and the inner ring region of the second connecting portion, i.e., a horn may be inserted into the inner ring region of the first pole portion and the inner ring region of the second connecting portion to perform welding. The weld marks formed after welding have a relatively small effect on the flatness of the outer surface away from the active material-coated portion of the first pole, which is advantageous for subsequent welding of the first pole to a cover plate or bus member carrying the pole.

[0025] In some embodiments, the casing assembly further includes a pole cover plate located outside the casing and covering the first pole portion, a portion of the pole cover plate being fitted into the annular region of the inner periphery, and the pole cover plate and the inner periphery being spaced apart to form a second gap.

[0026] In the above technical solution, by installing the pole cover plate and the inner peripheral portion so that there is a second gap between them, the pole cover plate can be smoothly attached after welding the first pole portion and the second pole portion, and the compactness and reliability of the connection between the pole cover plate and the first pole portion can be improved.

[0027] In some embodiments, the first pole post is welded to the second pole post.

[0028] In the above technical proposal, by installing the first pole portion so that it is welded to the second pole portion, the configuration of the first pole can be simplified and the first pole can be easily attached to the casing, which is advantageous in further reducing production costs and improving assembly efficiency.

[0029] In some embodiments, the first pole has a recessed groove at the welding position between the first pole portion and the second pole portion to accommodate a weld mark formed after welding the first pole portion and the second pole portion.

[0030] In the above technical solution, a recessed groove for accommodating weld marks is installed at the location on the first pole corresponding to the welding position between the first pole portion and the second pole portion, thereby solving the problem of the weld marks protruding from the surface of the welding position and affecting the subsequent assembly of the first pole with other components such as the pole cover plate.

[0031] In some embodiments, the casing assembly further includes an insulating seal assembly that insulates the casing and the first pole, the insulating seal assembly including an insulating member and an insulating seal member having a heat resistance capability stronger than that of the insulating member, and the insulating seal member is located between the welding position of the first pole portion and the second pole portion and the casing.

[0032] In the above technical solution, the insulating seal assembly includes an insulating seal member that has a tight seal and relatively strong heat resistance, and the insulating seal member is installed between the welding position of the first and second electrode posts and the casing. This allows the insulating member to be installed away from the welding position of the first and second electrode posts relative to the insulating seal member, thereby reducing the impact of welding temperature on the insulating member. Furthermore, the insulating seal assembly is installed to include an insulating member with a relatively weak heat resistance, thereby ensuring the insulating seal effect and reducing the cost of the insulating seal assembly.

[0033] In some embodiments, the welding position of the first electrode post portion and the second electrode post portion is located outside the mounting hole, the insulating member includes an outer insulating member interposed between the first electrode post portion and the outer wall of the casing, and an inner insulating member interposed between the second electrode post portion and the inner wall of the casing, and the insulating seal member includes an inner step portion extending into the mounting hole and having both ends in the axial direction of the mounting hole abutting the first electrode post portion and the inner insulating member, respectively, and an outer step portion extending outside the mounting hole and having a radially inner end in the radial direction of the mounting hole connected to the inner step portion and a radially outer end abutting the outer insulating member.

[0034] In the above technical solution, the insulating seal assembly is easy to assemble, and due to the structural distribution position of the insulating seal member, both the inner insulating member and the outer insulating member can better obtain the heat insulating protective effect of the seal insulating member.

[0035] In some embodiments, a plurality of poles are provided on the casing, at least one of which is the first pole.

[0036] In the above technical solution, by installing at least one of all the poles of the casing assembly as a first pole, some or all of the entire battery cells may be separately molded first poles, so that poles can be flexibly selected and combined according to manufacturing needs, cost needs, etc.

[0037] In a second aspect, embodiments of the present application further provide a battery comprising the battery cell described above.

[0038] In the above technical solution, the design of the battery cell is diverse, which is advantageous for improving the diversity of the battery design.

[0039] In a third aspect, embodiments of the present application further provide an electrical device comprising the battery described above.

[0040] In the above technical solution, the battery can have various designs, which is advantageous for flexibly designing different batteries according to the actual needs of the electrical devices and optimizing the power supply needs of the electrical devices.

[0041] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings used in the embodiments. However, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0042] [Figure 1] 1 is a structural schematic diagram of an electric device, which is a vehicle, provided by some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery cell used in a battery provided in accordance with some embodiments of the present application. FIG. [Figure 3] 1 is a perspective view of a battery cell provided in accordance with some embodiments of the present application. [Figure 4] FIG. 4 is an exploded view of the structure of the battery cell shown in FIG. 3. [Figure 5] FIG. 4 is an orthographic view of the battery cell shown in FIG. 3. [Figure 6] FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] FIG. 7 is an enlarged view of a portion B shown in FIG. 6. [Figure 8] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 9] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 10] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 11] 1 is a perspective view of a first pole provided in accordance with some embodiments of the present application. FIG. [Figure 12] FIG. 12 is an orthographic view of the battery cell shown in FIG. 11. [Figure 13] FIG. 13 is a cross-sectional view taken along line CC in FIG. [Figure 14] FIG. 13 is a cross-sectional view taken along line DD in FIG. [Figure 15] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 16] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0043] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments of the present application. All other embodiments obtained based on the embodiments of the present application without the need for creative work by those skilled in the art fall within the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application, and the terms "comprises" and "has" and any variations thereof in the specification, claims, and drawings of this application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects and are not used to describe a particular order or priority.

[0045] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase in various locations in the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments of other embodiments.

[0046] The term "and / or" in this application is simply a relational relationship that describes related objects, and indicates that three types of relationships can exist. For example, A and / or B can represent three situations: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0047] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various components in the embodiments of the present application shown in the accompanying drawings, and the overall thickness, length, width, etc. of the integrated device, are merely exemplary and should not be construed as limitations of the present application.

[0048] The term "plurality" as used herein refers to 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, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0050] For example, a battery cell may typically include a casing, a battery core assembly, and an electrolyte. The casing is used to house the battery core assembly and the electrolyte. The casing is provided with poles, which typically include a plurality of poles, including at least one positive pole and at least one negative pole. The battery core assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative pole pieces and separator films.

[0051] The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer being a positive electrode tab sheet, and multiple positive electrode tab sheets are stacked and electrically connected to the positive electrode post. For example, multiple stacked positive electrode tab sheets can be directly welded to the positive electrode post to form the electrical connection, or the battery core assembly can include a positive electrode adapter sheet, and multiple stacked positive electrode tab sheets can be welded to one end of the positive electrode adapter sheet and the other end of the positive electrode adapter sheet to electrically connect the positive electrode tab sheet and the positive electrode post.

[0052] The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer being used as a negative electrode tab sheet, and multiple negative electrode tab sheets are stacked together and electrically connected to the negative electrode post. For example, the multiple negative electrode tab sheets stacked together can be directly welded to the negative electrode post to form the electrical connection, or the battery core assembly can include a negative electrode adapter sheet, and the multiple negative electrode tab sheets stacked together can be welded to one end of the negative electrode adapter sheet and the other end of the negative electrode adapter sheet to the negative electrode post, thereby electrically connecting the negative electrode tab sheet and the negative electrode post.

[0053] The material of the separator film is not particularly limited, and may be, for example, polypropylene or polyethylene.

[0054] At the same time, battery cells primarily rely on the movement of metal ions between the positive and negative electrodes to function. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon. During charging and discharging, Li+ ions are repeatedly inserted and extracted between the two electrodes. During charging, Li+ ions are extracted from the positive electrode and inserted into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state, and vice versa during discharging.

[0055] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a case for enclosing one or more battery cells or one or more battery modules. The case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0056] In a battery, multiple battery cells can be connected in series, parallel, or series-parallel, and a series-parallel connection refers to multiple battery cells being connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or series-parallel, and the entire battery cell set can be housed in a case. Alternatively, a battery can also be configured such that multiple battery cells are first connected in series, parallel, or series-parallel to form a battery module, and the multiple battery modules are further connected in series, parallel, or series-parallel to form an integrated battery module and housed in a case.

[0057] Batteries in the related art further include bus members for achieving electrical connection between multiple battery cells. During battery manufacturing, the bus members are welded to the electrode posts of the battery cells to achieve electrical connection between the bus members and the electrode posts, and the electrode posts are electrically connected to the battery core assembly by welding to conductive parts such as tab sheets or adapter sheets. Typically, electrode posts are integrally molded and attached to the casing by riveting. Therefore, the shape of the electrode post must meet the requirements of riveting, and the entire electrode post must be made of the same material. This limits the structural shape and material of such electrode posts, making it difficult to flexibly modify them into other new structures or to use various materials, making it difficult to meet the needs of more applications.

[0058] Based on the above considerations, the present application proposes a battery cell design in which the electrode post is configured to include at least two separately molded sections, and the structural shapes and materials of each section are designed independently, thereby improving the design diversity of the electrode post and its adaptability to a variety of situations. This is advantageous for flexible design of the electrode post into various new shapes, and at least a portion of the electrode post can be provided outside the casing and configured to be suitable for direct or indirect connection with the bus member, while at least a portion of the remaining electrode post can be provided inside the casing and configured to be suitable for connection with the conductive portion of the battery core assembly, thereby better satisfying the need for the electrode post to be well connected to both the conductive portion and the bus member, and improving the design diversity of the electrode post and its adaptability to a variety of situations.

[0059] The present embodiment further provides an electric device that uses the battery of the present application as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric scooter, an electric car, a boat, a spacecraft, etc. Among them, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric boat toy, and an electric plane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0060] For the sake of convenience, in the following embodiments, a vehicle, which is an electric device, will be used as an example to describe in detail the structure of the electric device, battery, and battery cell of the present application.

[0061] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an electric device 1000, which is a vehicle provided by some embodiments of the present application. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed in the vehicle, and the battery 100 may be installed at the bottom, head, or tail of the vehicle. The battery 100 is used to supply power to the vehicle. For example, the battery 100 can function as an operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs for starting, navigating, and driving the vehicle. In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle but also as a driving power source for the vehicle, and can provide driving power to the vehicle in place of or partially replacing fuel or natural gas.

[0062] Referring to FIG. 2, FIG. 2 is an exploded view of the structure of a battery cell 10 used in a battery 100 provided according to some embodiments of the present application. The battery 100 includes a case 20 and a plurality of battery cells 10 housed within the case 20. The case 20 provides an assembly space for the battery cells 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first case 201 and a second case 202, which cover each other and jointly define an assembly space for housing the battery cells 10. The second case 202 may have a hollow structure with one end open, and the first case 201 may have a plate-like structure, with the first case 201 covered by the open side of the second case 202 so that the first case 201 and the second case 202 jointly define an assembly space, or the first case 201 and the second case 202 may both have a hollow structure with one end open (for example, as shown in FIG. 2), with the open side of the first case 201 covered by the open side of the second case 202. Of course, the case 20 formed by the first case 201 and the second case 202 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0063] Referring to Figure 3, Figure 3 is a schematic diagram of a battery cell 10 provided according to some embodiments of the present application. The battery cell 10 has a rectangular parallelepiped shape, and the height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, and the thickness direction of the battery cell 10 is a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other two by two. However, this is not limited thereto, and in other embodiments of the present application, the battery cell 10 may also have other shapes, such as a cylindrical, flat, or prismatic structure.

[0064] Please refer to Figure 4, which is an exploded view of the structure of the battery cell shown in Figure 3. In the embodiment of the present application, the battery cell 10 includes a casing assembly 1 and a battery core assembly 2. The casing assembly 1 includes a casing 11 and a first pole 12 installed in the casing 11. The shape of the casing 11 can be adjusted according to the type of the battery cell 10, and the type of the battery cell 10 in the embodiment of the present application is not particularly limited. For example, if the battery cell 10 is a prismatic battery, the casing 11 will be prismatic, and if the battery cell 10 is a cylindrical battery, the casing 11 will be cylindrical. In the embodiment of the present application, the casing 11 will be prismatic.

[0065] The casing 11 is provided with poles for electrical connection with the battery core assembly 2 to ensure normal charging and discharging of the battery cells 10. Generally, there are at least two poles, specifically, at least one positive pole and at least one negative pole. For example, if there are two poles, one is a positive pole and the other is a negative pole, which are electrically connected to the positive and negative output positions of the battery core assembly 2, respectively. Alternatively, if there are four poles, two may be positive poles and the remaining two may be negative poles. In this case, both of the two positive poles are electrically connected to the positive output positions of the battery core assembly 2, and both of the two negative poles are electrically connected to the negative output positions of the battery core assembly 2.

[0066] In the embodiment of the present application, at least one of the plurality of poles in the casing 11 is a first pole 12, which may be a positive pole or a negative pole, and which is formed separately and then connected. In other words, all of the poles in the casing 11 may be first poles 12 that are formed separately, or only some of the poles in the casing 11 may be first poles 12 that are formed separately. If some of the poles in the casing 11 are first poles 12 that are formed separately, the remaining poles in the casing 11 are second poles (not shown) that are integrally formed.

[0067] Regardless of whether the pole in the casing 11 is the first pole 12 or the second pole, both the first pole 12 and the second pole can be electrically connected to the battery core assembly 2 to ensure that the charging and discharging process of the battery cell 10 is performed normally. Of course, in other embodiments of the present application, only one pole may be further provided in the casing assembly 1, and this pole may be the first pole 12. In this case, the first pole 12 may include one portion that is insulated and connected and used as a positive pole, and the other portion that is used as a negative pole. For ease of explanation, the following description will mainly focus on an example in which there are multiple poles in the casing 11, and all of the poles are first poles 12.

[0068] 5 to 7, Fig. 5 is an orthographic view of the battery cell shown in Fig. 3, Fig. 6 is a cross-sectional view taken along line AA in Fig. 5, and Fig. 7 is an enlarged view of a portion B shown in Fig. 6. In the embodiment of the present application, the battery core assembly 2 includes an active material-applied portion 21 and a conductive portion 22. The active material-applied portion 21 is provided within the casing 11 and is the portion of the battery core assembly 2 to which the active material is applied, and can assist in the detachment of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material-applied portion 21 and the electrode post, which is not coated with the active material. Both the first electrode post 12 and the second electrode post 12 may be electrically connected to the active material-applied portion 21 via the conductive portion 22 so that the charging and discharging of the battery cell 10 can be performed. For example, the conductive portion 22 may include only a tab sheet that is directly electrically connected to the pole, or, for example, the conductive portion may include a tab sheet and an adapter sheet that is welded to the tab sheet, and the tab sheet is indirectly electrically connected to the pole via the adapter sheet.

[0069] As will be understood, the active material-coated portion 21 is divided into a positive electrode active material-coated portion and a negative electrode active material-coated portion, the positive electrode active material-coated portion including a portion where a positive electrode active material layer is coated on a positive electrode current collector, and the negative electrode active material-coated portion including a portion where a negative electrode active material layer is coated on a negative electrode current collector. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion, the positive electrode conductive portion electrically connecting the positive electrode active material-coated portion and the positive electrode pole, and the negative electrode conductive portion electrically connecting the negative electrode active material-coated portion and the negative electrode pole.

[0070] 4, 6, and 7, in the embodiment of the present application, the casing 11 has a mounting hole 111, and the first pole 12 is drilled through the mounting hole 111. The first pole 12 includes a first pole section 121 and a second pole section 122 that are separately molded and connected to each other. That is, the first pole section 121 is independently molded, and the second pole section 122 is also independently molded. The first pole section 121 and the second pole section 122 are not integrally molded, but are directly or indirectly connected by a process such as welding or adhesive. This allows the structural shape and material of the first pole section 121 and the structural shape and material of the second pole section 122 to be independently designed, which is advantageous for flexibly designing the first pole 12 into various novel shapes and increasing the design diversity of the first pole 12.

[0071] In the embodiment of the present application, at least a portion of the first electrode pillar portion 121 is engaged outside the casing 11, at least a portion of the second electrode pillar portion 122 is engaged inside the casing 11, and the second electrode pillar portion 122 is connected to the conductive portion 22. Referring again to Fig. 7 , the first electrode pillar portion 121 includes a first stopper portion 1211 that directly or indirectly abuts against the outside of the casing 11 to prevent the first electrode pillar portion 121 from entering the inside of the casing 11 through the mounting hole 111. The second electrode pillar portion 122 includes a second stopper portion 1221 that directly or indirectly abuts against the inside of the casing 11 to prevent the second electrode pillar portion 122 from moving out of the casing 11 through the mounting hole 111.

[0072] The second pole 122 and the conductive part 22 are electrically connected by welding or other means. At least a portion of the second pole 122 is fitted inside the casing 11 and connected to the conductive part 22, so that the structural shape and material of the second pole 122 can be set to be suitable for connection with the conductive part 22. At the same time, at least a portion of the first pole 121 is fitted outside the casing 11, so that the first pole 121 can be directly or indirectly connected to a bus member. The structural shape and material of the first pole 121 can be set to be suitable for direct or indirect connection with a bus member. This better satisfies the needs for good connection between the first pole 12 and both the conductive part 22 and the bus member, thereby improving the applicability of the first pole 12 to various situations.

[0073] In the above technical solution, the first pole 12 is configured to include a first pole section 121 and a second pole section 122 that are formed separately, so that at least a portion of the first pole section 121 is fixed outside the casing 11, and at least a portion of the second pole section 122 is fixed inside the casing 11, and the second pole section 122 is connected to the conductive section 22. This allows the structural shapes and materials of the first pole section 121 and the second pole section 122 to be designed and selected independently, which is advantageous for flexible design of poles into various new shapes, thereby improving the design diversity of the first pole 12 and the first This is advantageous in expanding the range of applications for the electrode post 12. Specifically, the structural shape and material of the second electrode post portion 122 can be set to be advantageous for connection to the conductive part 22, and the structural shape and material of the first electrode post portion 121 can be set to be suitable for direct or indirect connection to the bus member. This allows the first electrode post 12 to better meet the needs for good connection with both the conductive part 22 and the bus member. This therefore makes the design of the first electrode post 12 more flexible and broadens the range of applications, which is advantageous in improving the design diversity of the battery cell 10.

[0074] 7 again, in some embodiments of the present application, the second electrode post portion 122 includes a first connection portion 1222, and the first electrode post 12 has a cavity 123 formed on the side of the first connection portion 1222 that faces away from the active material coated portion 21, and at least a portion of the conductive portion 22 is housed in the cavity 123 and connected to the first connection portion 1222. Thus, by providing the cavity 123 that houses at least a portion of the conductive portion 22, at least a portion of the conductive portion 22 can occupy space within the first electrode post 12, thereby reducing the space occupied by the conductive portion 22 within the casing 11. This frees up some space within the casing 11 to house a larger active material coated portion 21, thereby improving the volumetric energy density of the battery cell 10.

[0075] In the embodiment of the present application, the hardness of at least the first connecting portion 1222 of the second pole portion 122 is greater than the hardness of the first pole portion 121. In other words, only the first connecting portion 1222 may have a greater hardness than the first pole portion 121, or the entire second pole portion 122 may have a greater hardness than the first pole portion 121.

[0076] It should be noted that the materials of the first connecting portion 1222 and the first pole portion 121 are not limited, and there are many types that can be selected. For example, they may be two types of copper materials with different hardness, or two types of aluminum materials with different hardness. For example, the first pole portion 121 and the first connecting portion 1222 are both selected from the aluminum materials Al3003-H14, Al3003-H18, Al3003-H112, Al1060-H14, Al1060-H18, and Al1060-H112 (it should be understood that the hardness of H14 is lower than that of H18, and the hardness of H18 is lower than that of H112). The selected material may be any material as long as the hardness of the first connecting portion 1222 is greater than the hardness of the first pole portion 121. For example, if the first connecting portion 1222 is made of Al1060-H112 or Al3003-H112, the first pole portion 121 may be made of any one of Al3003-H14, Al3003-H18, Al1060-H14, and Al1060-H18. Alternatively, if the first connecting portion 1222 is made of Al1060-H18 or Al3003-H18, the first pole portion 121 may be made of Al3003-H14 or Al1060-H14.

[0077] The following briefly describes the hardness measurement procedure. 1) The power was turned on and the testing equipment (e.g., a Vickers hardness tester) was checked for normal operation. 2) The sheared test sample was placed under the lens of the Vickers hardness tester, the test line was returned to zero through the eyepiece, and the lifting rod was adjusted so that the sample surface could be clearly observed through the eyepiece. 3) After adjusting the lifting rod, the start key was pressed to begin loading the sample. 4) After loading was completed, the lengths of both diagonal lines of the indentation were measured through the eyepiece and entered into the device. The device automatically displayed the Vickers hardness value and recorded the measurement results. The hardness measurement allows the relationship between the hardness of the first connecting portion 1222 and the first pole portion 121 to be determined.

[0078] In the above technical proposal, a cavity 123 is formed on the side of the first connection portion 1222 away from the active material application portion 21, so that it is unable to obtain support from the casing 11 and is relatively prone to deformation. However, in the present application, by installing at least the first connection portion 1222 of the second pole portion 122 so that its hardness is greater than that of the first pole portion 121, it is possible to reduce deformation of the first connection portion 1222 to some extent, thereby improving the connection reliability between the first connection portion 1222 and the conductive portion 22 and improving the conductivity yield.

[0079] The first electrode post portion 121, which has a relatively low hardness, is advantageous in improving the yield of electrical connection between the first electrode post portion 121 and the bus members. Referring again to Figure 7, if the first electrode post portion 121 has a hollow structure, the electrode post of the cover plate 13 may be welded onto the first electrode post portion 121, and bus members may be further welded onto the electrode post cover plate 13. The relatively low hardness of the first electrode post portion 121 is advantageous in improving the welding yield between the first electrode post portion 121 and the electrode post cover plate 13 and further improving the yield of electrical connection between the first electrode post portion 121 and the bus members. Referring to FIG. 9, FIG. 9 is a local cross-sectional view of a battery cell 10 provided by some embodiments of the present application. When the first electrode post portion 121 has a solid structure, the bus members can be directly welded to the first electrode post portion 121. Since the hardness of the first electrode post portion 121 is relatively low, this is advantageous for improving the welding yield between the first electrode post portion 121 and the bus members, and further improving the electrical connection yield between the first electrode post portion 121 and the bus members.

[0080] In the related art, the terminal post is a single-piece molded product and riveted to the casing. If the terminal post has a relatively high hardness, it is difficult to meet the extensibility requirements of the riveted flange, making the process more difficult. If the terminal post has a relatively low hardness, the terminal post will correspond to a cavity, and the portion connected to the conductive part will be easily deformed, resulting in insufficient strength and making it difficult to securely connect to the conductive part. In the present application, the first terminal post 12 includes a second terminal post portion 122 and a first terminal post portion 121 that are independently processed and formed. The second terminal post portion 122 and the first terminal post portion 121 have different hardnesses. The second terminal post portion 122, which has a relatively high hardness, is less likely to deform, which is advantageous for securely connecting to the conductive part 22. The first terminal post portion 121, which has a relatively low hardness, has a good welding yield and is advantageous for direct or indirect electrical connection to bus members.

[0081] The first stopper portion 1211 of the first terminal post portion 121 may be formed directly when the first terminal post portion 121 is processed, or may be formed after the first terminal post portion 121 is riveted to the casing 11. However, since the first terminal post portion 121 has a relatively low hardness, it has excellent ductility so that the first terminal post portion 121 can be easily riveted. To simplify the processing, the first stopper portion 1211 may be provided so as to be formed directly when the first terminal post portion 121 is processed, and the second terminal post 12 is fixed to the casing 11 by welding the first terminal post portion 121 and the second terminal post portion 122. In this case, the first terminal post portion 121 does not need to be connected to the casing 11 by riveting, which simplifies the assembly process and improves assembly efficiency.

[0082] It should be noted that the relative position of the cavity 123 with respect to the first connection portion 1222 is not limited to the above description. For example, referring again to FIG. 9, the first pole 12 may also have a cavity 123 formed on the side of the first connection portion 1222 facing the active material application portion 21. This is advantageous in increasing the volume of the conductive portion 22 accommodated in the cavity 123, and the cavity 123 can be arranged in a sealed form to alleviate the problem of electrolyte and the like in the casing 11 leaking out of the first pole 12. 10, which is a local cross-sectional view of a battery cell 10 according to some embodiments of the present application, the first pole 12 may further have cavities 123 formed on the side of the first connection portion 1222 facing the active material-coated portion 21 and on the side away from the active material-coated portion 21, respectively, and the first connection portion 1222 has through-holes 12221 communicating with the cavities 123 on both sides of the first connection portion 1222, and a portion of the conductive portion 22 is inserted into the cavity 123 outside the first connection portion 1222 through the through-holes 12221, thereby facilitating connection between the conductive portion 22 and the first connection portion 1222 from the outside. Here, the "outside" refers to the side away from the active material-coated portion 21.

[0083] 7 , in some embodiments, the through hole 12221 is provided at an edge position where the first connection portion 1222 and the second connection portion 1224 are connected. In the above technical solution, the through hole 12221 is provided at a position close to the second connection portion 1224 of the first connection portion 1222. Therefore, when at least a portion of the conductive portion 22 inserted into the cavity 123 is connected to the first connection portion 1222, the first connection portion 1222 can have a relatively large area connected to the conductive portion 22. This increases the connection area between the conductive portion 22 and the first connection portion 1222, which is advantageous for improving the connection reliability and conductive area between the conductive portion 22 and the first connection portion 1222.

[0084] In some embodiments, referring again to FIG. 7 , the active material application portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211, the conductive portion 22 includes a tab portion 221 electrically connected to the current collector 211 and including a plurality of tab sheets 2210, the plurality of tab sheets 2210 gathering at a position close to the current collector 211 to form a first converging portion 2211, the plurality of tab sheets 2210 gathering and connecting at a position away from the current collector 211 to form a second converging portion 2212, and the first converging portion 2211 connecting the second converging portion 2212 and the active material application portion 21.

[0085] In the above technical solution, the multiple tab sheets 2210 simply converge (i.e., converge toward each other) but are not connected when forming the first converging portion 2211, but when forming the second converging portion 2212, the multiple tab sheets 2210 not only converge but also connect to form an integral structure. For example, the multiple tab sheets 2210 can be connected to an integral plate-like structure by welding (e.g., ultrasonic welding) to form the second converging portion 2212, or the multiple tab sheets 2210 can be gathered and connected by a method such as bonding with a conductive adhesive to form the second converging portion 2212, and the description thereof will be omitted here.

[0086] For illustrative purposes, in the present embodiment, the tab sheet 2210 is divided into a positive electrode tab sheet and a negative electrode tab sheet, and the positive electrode tab sheets that need to be converged are stacked and ultrasonically pre-welded to form a positive electrode second convergence portion, thereby reducing the interlayer gap and forming a plate-like structure with a certain rigidity from the plurality of puffed positive electrode tab sheets. Similarly, the negative electrode tab sheets that need to be converged are stacked and ultrasonically pre-welded to form a negative electrode second convergence portion, thereby reducing the interlayer gap and forming a plate-like structure with a certain rigidity from the plurality of puffed negative electrode tab sheets.

[0087] In the above technical solution, "a plurality of tab sheets 2210 gather at a position close to the current collector 211 to form a first converging portion 2211, and a plurality of tab sheets 2210 gather at a position away from the current collector 211 and connect to form a second converging portion 2212" means that the first converging portion 2211 and the second converging portion 2212 are sequentially arranged along the extending direction of the tab sheets 2210 in a direction away from the current collector 211, but the specific positions of the first converging portion 2211 and the second converging portion 2212 are not limited, that is, there is no requirement as to how close the first converging portion 2211 is to the current collector 211 or how far the second converging portion 2212 is from the current collector 211. In some alternative embodiments, the current collector 211 and tab sheet 2210 may be a unitary member, such as an aluminum foil integrally molded onto the positive electrode piece, or a copper foil integrally molded onto the negative electrode piece.

[0088] 7 , in some alternative embodiments, the conductive part 22 is configured with a tab part 221, and at least a portion of the second convergent part 2212 passes through the through hole 12221 and is accommodated in the cavity 123. In the above technical solution, the tab part 221 includes the second convergent part 2212 formed by gathering and connecting a plurality of tab sheets 2210. This makes it easier for at least a portion of the second convergent part 2212 to pass through the through hole 12221 and be accommodated in the cavity 123, and is advantageous in simplifying the configuration and processing of the conductive part 22.

[0089] In some other optional embodiments, refer to FIG. 8, which is a local cross-sectional view of a battery cell provided by some embodiments of the present application, in which the conductive portion 22 includes a tab portion 221 and an adapter sheet 222 at least partially penetrating the through-hole 12221 and housed in the cavity 123, and the adapter sheet 222 is connected between the second converging portion 2212 and the first connection portion 1222. In the above technical solution, the conductive part 22 includes the tab part 221 and the adapter sheet 222, and the adapter sheet 222 passes through the through hole 12221, making it easy to operate. Furthermore, by using the adapter sheet 222 to realize an indirect electrical connection between the second converging part 2212 and the first connecting part 1222, the adapter sheet 222 can be connected to the first connecting part 1222 through a portion that avoids the second converging part 2212. This ensures good welding reliability between the adapter sheet 222 and the first connecting part 1222, making it less likely to cause welding cracks, and further improving the reliability and stability of the battery cell 10.

[0090] 7 and 11 to 14, FIG. 11 is a perspective view of a first pole 12 provided by some embodiments of the present application, FIG. 12 is an orthographic view of the battery cell 10 shown in FIG. 11, FIG. 13 is a cross-sectional view taken along line CC in FIG. 12, and FIG. 14 is a cross-sectional view taken along line DD in FIG. 12. In some embodiments of the present application, the second pole part 122 further includes a second connecting part 1224 drilled in the mounting hole 111, and the second connecting part 1224 is disposed so as to surround the inner wall of the mounting hole 111. The first connecting portion 1222 is provided in the inner ring region of the second connecting portion 1224 and is connected to the inner end of the second connecting portion 1224 that is close to the active material applied portion 21. The second connecting portion 1224, together with the first connecting portion 1222, surrounds a cavity 123. The cavity 123 is open in a direction away from the active material applied portion 21. A through-hole 12221 that communicates with the cavity 123 is formed in the first connecting portion 1222. A part of the conductive portion 22 passes through the through-hole 12221 and is accommodated in the cavity 123.

[0091] The second connecting portion 1224 has a ring-shaped structure that matches the shape of the mounting hole 111. It should be noted that the ring-shaped structure according to the present application is not limited to a circular ring, and may be, for example, a rectangular ring, a racetrack, or an elliptical ring.

[0092] In the above technical solution, the second pole portion 122 includes a second connecting portion 1224 drilled into the mounting hole 111, thereby facilitating assembly of the second pole portion 122 and the casing 11. The annular second connecting portion 1224 and the first connecting portion 1222 connected to the inner end of the second connecting portion 1224 jointly define the cavity 123, thereby simplifying the structure of the second pole portion 122 and increasing the storage volume of the cavity 123. Furthermore, because the cavity 123 is open in the direction away from the active material-coated portion 21, a portion of the conductive portion 22 can be inserted into the cavity 123 through the through-hole 12221 of the first connecting portion 1222, facilitating connection between the conductive portion 22 and the first connecting portion 1222 from outside the casing 11, facilitating manufacture of the battery cell 10.

[0093] It should be noted that the number, position, and shape of the through holes 12221 are not limited, and may be, for example, one or at least two, may be, for example, located at the center or edge of the first connection portion 1222, and may be, for example, rectangular, oval, or elliptical.

[0094] 7 again, in some embodiments of the present application, the first electrode pillar portion 121 is located outside the casing 11 and has an annular structure, and the second electrode pillar portion 122 includes a second connecting portion 1224 drilled in the mounting hole 111, the second connecting portion 1224 having an annular structure installed to surround the inner wall of the mounting hole 111, and one end of the second connecting portion 1224 away from the active material coated portion 21 extends to be connected to the inner circumferential portion 12111 of the first electrode pillar portion 121. As will be understood, when the first electrode pillar portion 121 includes the annular first stopper portion 1211, the inner end of the first stopper portion 1211 constitutes the inner circumferential portion 12111 of the first electrode pillar portion 121.

[0095] In the above technical solution, the first pole portion 121 is located outside the casing 11 and has a ring structure, and the second connecting portion 1224 has a ring structure installed to surround the inner wall of the mounting hole 111, and its outer end portion 12241 can extend to the inner peripheral portion 12111 of the first pole portion 121, thereby simplifying the structure of the first pole 12, reducing the number of parts, and improving processing production efficiency. Furthermore, because the first pole portion 121 and the second connecting portion 1224 both have a ring structure, operations such as welding the first pole portion 121 and the second connecting portion 1224 can be easily performed from the outside of the casing 11 and the inner peripheral portion of the first pole portion 121, improving welding reliability and reducing welding difficulty.

[0096] It should be noted that the method of connecting the first pole portion 121 and the second pole portion 122 is not limited and may be, for example, welding, adhesive, etc. Also, in other embodiments of the present application, the first pole portion 121 and the second pole portion 122 may also be indirectly connected, for example, the first pole 12 may further include a third pole portion (not shown) that is independently processed and formed, the third pole portion is drilled in the mounting hole 111, and the outer end of the third pole portion is welded to the first pole portion 121, and the inner end of the third pole portion is welded to the second pole portion 122, etc.

[0097] In other embodiments of the present application, the first electrode pillar portion 121 may not necessarily be configured as an annular structure located outside the casing 11. For example, referring again to FIG. 9, the first electrode pillar portion 121 may be a solid cover plate structure, in which case the first electrode pillar portion 121 and the second electrode pillar portion 122 may be laser welded from the outside or inside of the casing 11. Alternatively, for example, the first electrode pillar portion 121 may be configured to include a third connecting portion (not shown) drilled in the mounting hole 111. In this case, the second electrode pillar portion 122 may be located inside the casing 11, and the third connecting portion may extend to the second electrode pillar portion 122 in a direction approaching the active material coated portion 21 and be welded to the second electrode pillar portion 122.

[0098] In the case where "one end of the second connecting portion 1224 away from the active material coated portion 21 extends to and is connected to the inner circumferential portion 12111 of the first pole portion 121," in some alternative embodiments, referring again to FIG. 10 , the end of the second connecting portion 1224 away from the active material coated portion 21 is defined as an outer end portion 12241, and the outer end portion 12241 extends to the side of the inner circumferential portion 12111 that is closer to the central axis of the mounting hole 111, that is, in the radial direction of the mounting hole 111, The outer end 12241 is disposed close to the central axis of the mounting hole 111 relative to the inner circumferential portion 12111, and the inner surface S12 of the inner circumferential portion 12111 and the outer surface S22 of the outer end 12241 are disposed opposite each other and welded together, with the inner surface S12 of the inner circumferential portion 12111 being the surface of the inner circumferential portion 12111 facing the central axis of the mounting hole 111, and the outer surface S22 of the outer end 12241 being the surface of the outer end 12241 facing away from the central axis of the mounting hole 111. This allows the weld seam between the inner surface S12 of the inner circumferential portion 12111 and the outer surface S22 of the outer end 12241 to be located on the outer surface away from the active material-coated portion 21 of the first electrode post 12, making welding easy from outside the casing 11, which is advantageous for reducing the difficulty of welding and improving welding yield.

[0099] Referring again to FIG. 10 , in some embodiments of the present application, the casing assembly 1 further includes a pole cover plate 13 located outside the casing 11 and covering the first pole portion 121. The pole cover plate 13 has a recess 131 formed therein corresponding to the welding position between the outer end 12241 and the inner periphery 12111 to accommodate the welding mark. That is, the welding mark formed after welding the outer end 12241 and the inner periphery 12111 can be at least partially accommodated within the recess 131, thereby solving the problem of interference between the welding mark and the pole cover plate 13. Even after welding the outer end 12241 and the inner periphery 12111, the pole cover plate 13 can still be smoothly assembled with the first pole portion 121, improving the compactness and reliability of the connection between the pole cover plate 13 and the first pole portion 121.

[0100] For example, laser welding can be adopted between the inner peripheral portion 12111 and the outer end portion 12241, and there is a welding mark at the welding point, which is a welding mark protruding from the surface of the welding point, and an escape groove 131 for accommodating the welding mark is provided at the position corresponding to the welding mark on the pole post cover plate 13, thereby improving the interference of the welding mark with the installation of the pole post cover plate 13, improving the compactness of the fit between the pole post cover plate 13 and the first pole post portion 121, and improving the reliability of the connection between the pole post cover plate 13 and the first pole post portion 121.

[0101] The method of connecting the first pole portion 121 and the pole cover plate 13 is not limited, and may be, for example, welding, adhesive bonding, or flange attachment. By installing the pole cover plate 13, the first pole portion 121 is covered, which improves the leakage of electrolyte and the like from the inner ring area of ​​the first pole portion 121 and provides a sealing effect.

[0102] 7, the first pole portion 121 may further include an extension portion 1212, which may extend from an end face of the outer circumferential portion 12112 of the first stopper portion 1211 that faces away from the casing 11 in a direction away from the first stopper portion 1211, so that a recessed groove 125 is formed between the extension portion 1212 and the first stopper portion 1211 in the first pole portion 121, and the pole cover plate 13 may be fitted into the recessed groove 125. This may improve the assembly efficiency, connection reliability, and fitting compactness of the pole cover plate 13 and the first pole portion 121.

[0103] Furthermore, the pole cover plate 13 can be made of a conductive material so as to electrically connect the pole cover plate 13 and the first pole part 121, and the bus member can be welded to the pole cover plate 13 to achieve electrical connection between the first pole 12 and the bus member through the pole cover plate 13. If the first pole part 121 and the bus member are made of the same material, the pole cover plate 13 can be installed as a one-piece cover and configured to be made of the same material as the bus member. If the first pole part 121 and the bus member are made of different materials, the pole cover plate 13 can be installed as a two-part composite cover, one part made of the same material as the bus member for easy welding, and the other part made of the same material as the first pole part 121 for easy welding.

[0104] For example, referring to FIG. 10 , the depth Z1 of the relief groove 131 may be 0.2 mm or more, so that after the first pole portion 121 and the second pole portion 122 are welded together, the pole cover plate 13 can be smoothly and easily attached to the first pole portion 121, thereby effectively avoiding welding marks; and the depth Z1 of the relief groove 131 can be set to 0.4 mm or less to prevent the relief groove 131 from being too deep, thereby increasing the thickness of the corresponding relief groove 131 of the pole cover plate 13, and further increasing the structural strength and current passing efficiency of the pole cover plate 13 at that local position.

[0105] Referring to Figure 10, for example, the pole cover plate 13 includes an inner fitting portion 132 extending into the inner ring region of the second connection portion 1224, and the outer peripheral surface 1321 of the inner fitting portion 132 and the inner surface S23 of the outer end portion 12241 are spaced apart to form a first gap 14. Specifically, when the inner peripheral portion 12111 of the first pole portion 121 and the outer end portion 12241 of the second pole portion 122 are welded together, the inner ring dimension of the second connecting portion 1224 is easily reduced, making it impossible for the inner fitting portion 132 to be inserted into the inner ring area of ​​the second connecting portion 1224. However, the present application provides a first gap 14 between the outer peripheral surface 1321 of the inner fitting portion 132 and the inner surface S23 of the outer end portion 12241. Therefore, after the first pole portion 121 and the second pole portion 122 are welded together, the inner ring area of ​​the second connecting portion 1224 still has space for the inner fitting portion 132 to be inserted, thereby ensuring that the pole cover plate 13 can be smoothly attached to the first pole portion 121.

[0106] For example, referring to FIG. 10, the dimension Z2 of the first gap 14 may be 0.2 mm or more, which allows the inner ring area of ​​the second connection portion 1224 to have sufficient space to be inserted into the internal fitting portion 132 after welding the first pole portion 121 and the second pole portion 122 together, thereby improving the smoothness with which the pole cover plate 13 is attached to the first pole portion 121. By setting the dimension Z2 of the first gap 14 to 0.4 mm or less, it is possible to prevent the first gap 14 from being too large, which is advantageous for increasing the volume of the internal fitting portion 132 as much as possible, reducing resistance, and improving current passage efficiency.

[0107] The present application is not limited thereto, and may have several other alternative embodiments when "one end of the second connection portion 1224 away from the active material coated portion 21 extends to and is connected to the inner circumferential portion 12111 of the first pole portion 121." For example, refer to FIG. 15, which is a local cross-sectional view of a battery cell 10 provided by several embodiments of the present application. In the figure, the end of the second connection portion 1224 away from the active material coated portion 21 is the outer end 12241, and the inner circumferential portion 12111 of the first pole portion 121 is the active material of the outer end 12241. It abuts against the side away from the application portion 21, that is, in the axial direction of the mounting hole 111, the inner peripheral portion 12111 is positioned away from the active material application portion 21 relative to the outer end portion 12241, and the inner end surface S11 of the inner peripheral portion 12111 and the outer end surface S21 of the outer end portion 12241 are positioned opposite each other and are welded together, and of these, the inner end surface S11 of the inner peripheral portion 12111 is the end surface of the inner peripheral portion 12111 that faces toward the active material application portion 21, and the outer end surface S21 of the outer end portion 12241 is the end surface of the outer end portion 12241 that is away from the active material application portion 21.

[0108] This allows the horn to be inserted into the annular region of the first pole portion 121 and the annular region of the second connecting portion 1224 and welded, and the weld marks formed after welding have a relatively small effect on the flatness of the outer surface away from the active material application portion 21 of the first pole 12, which is advantageous for subsequent welding of the first pole 12 to the pole cover plate 13 or bus member.

[0109] For example, referring again to Figure 15, the casing assembly 1 further includes a pole cover plate 13 located outside the casing 11 and covering the first pole portion 121, a portion of the pole cover plate 13 is fitted into the annular region of the inner periphery 12111, and the pole cover plate 13 and the inner periphery 12111 are spaced apart to form a second gap 15.

[0110] Specifically, after welding the inner peripheral portion 12111 of the first pole column portion 121 and the outer end portion 12241 of the second pole column portion 122, the weld seam formed between the inner ring region of the first pole column portion 121 and the inner ring region of the second connecting portion 1224 protrudes radially, and the inner peripheral portion 12111 tends to protrude in a direction away from the active material application portion 21. By providing second gaps 15 at these two locations, it is possible to ensure that the pole cover plate 13 can be smoothly assembled to the first pole column portion 121 after welding the first pole column portion 121 and the second pole column portion 122. Therefore, in the above technical solution, by installing the pole cover plate 13 so that there is a second gap 15 between the pole cover plate 13 and the inner peripheral portion 12111, it is possible to ensure that the pole cover plate 13 is smoothly installed after welding the first pole portion 121 and the second pole portion 122, thereby improving the compactness and reliability of the connection between the pole cover plate 13 and the first pole portion 121.

[0111] In some embodiments of the present application, the first pole portion 121 is welded to the second pole portion 122. This simplifies the structure of the first pole portion 12 and makes it easy to attach it to the casing 11, which is advantageous in reducing production costs and improving assembly efficiency.

[0112] 16, which is a local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application, exemplarily shows that when a first electrode post portion 121 and a second electrode post portion 122 are welded together, the first electrode post 12 has a recess 124 at the welding position between the first electrode post portion 121 and the second electrode post portion 122 to accommodate a welding mark formed after welding the first electrode post portion 121 and the second electrode post portion 122. This can alleviate the problem of the welding mark protruding from the surface of the welding position and affecting the subsequent assembly of the first electrode post 12 with other components, such as the electrode post cover plate 13.

[0113] Referring again to Figures 4 and 7, in some embodiments of the present application, the casing assembly 1 further includes an insulating seal assembly 16 that insulates the casing 11 and the first pole 12, and the insulating seal assembly 16 includes an insulating member 161 and an insulating seal member 162 having a heat resistance capability stronger than that of the insulating member 161, and the insulating seal member 162 is located between the welding position of the first pole portion 121 and the second pole portion 122 and the casing 11.

[0114] The insulating seal assembly 16 is assembled between the casing 11 and the first pole 12, and the casing 11 and the first pole 12 are in an insulating relationship. The insulating seal assembly 16 includes an insulating member 161 and an insulating seal member 162, which has a sealing function in addition to an insulating function, and has a stronger heat resistance than the insulating member 161.

[0115] In the above technical solution, the insulating seal assembly 16 is configured to include an insulating member 161 having a relatively weak heat resistance and an insulating seal member 162 having a tight seal and a relatively strong heat resistance. The insulating seal member 162 is installed between the casing 11 and the welding position of the first electrode post 121 and the second electrode post 122, and the insulating member 161 is installed farther away from the welding position of the first electrode post 121 and the second electrode post 122 than the insulating seal member 162. This makes it possible to reduce the influence of the welding temperature on the insulating member 161 by using the insulating seal member 162, and further reduce the cost of the insulating seal assembly 16 while ensuring the insulating seal effect.

[0116] For example, the insulating member 161 is made of a plastic material and has a heat resistance temperature of approximately 250° C., and the insulating seal member 162 is made of a rubber material and has a heat resistance temperature of approximately 400° C. This allows for low cost and excellent insulating and sealing effects, and the insulating seal member 162 can effectively reduce the influence of welding temperature on the insulating member 161.

[0117] Referring again to FIG. 7 , in some embodiments of the present application, the welding position of the first electrode pillar portion 121 and the second electrode pillar portion 122 is located outside the mounting hole 111, the insulating member 161 includes an outer insulating member 1611 interposed between the first electrode pillar portion 121 and the outer wall of the casing 11, and an inner insulating member 1612 interposed between the second electrode pillar portion 122 and the inner wall of the casing 11, and the insulating seal member 162 includes an inner step portion 1622 extending into the mounting hole 111 and having both ends in the axial direction of the mounting hole 111 abutting the first electrode pillar portion 121 and the inner insulating member 1612, respectively, and an outer step portion 1621 extending outside the mounting hole 111 and having a radially inner end in the radial direction of the mounting hole 111 connected to the inner step portion 1622 and a radially outer end abutting the outer insulating member 1611.

[0118] This simplifies assembly of the insulating seal assembly 16, and the structural distribution of the insulating seal member 162 allows both the inner insulating member 1612 and the outer insulating member 1611 to better obtain the heat insulating protective effect of the insulating seal member 161. The arrangement of the insulating seal member 162 also provides excellent sealing effect while maintaining volume and keeping costs low.

[0119] Of course, the present application is not limited to this. For example, in another optional embodiment of the present application, the volume of the insulating seal member 162 may be further increased slightly, and the inner step portion 1622 of the insulating seal member 162 abuts against the first pole portion 121 and the second pole portion 122 at both ends in the axial direction of the mounting hole 111, respectively, and the inner insulating member 1612 abuts against the side of the inner step portion 1622 that is away from the central axis of the mounting hole 111 (this embodiment is not shown).

[0120] 3 to 7 and 11 to 14, a battery cell 10 according to a specific embodiment of the present invention will be described.

[0121] The battery cell 10 includes a casing assembly 1 and a battery core assembly 2. The casing assembly 1 includes a casing 11 including a casing body 112 and a bottom cover 113. One positive electrode post and one negative electrode post are provided on the side of the casing body 112 away from the bottom cover 113, and both the positive electrode post and the negative electrode post are first electrode posts 12, which are drilled in mounting holes 111 in the casing body 112. The battery core assembly 2 includes an active material-coated portion 21 coated with an insulating film 17 and provided within the casing 11, and a conductive portion 22 that electrically connects the active material-coated portion 21 and the first electrode post 12.

[0122] The first pole 12 includes a first pole portion 121 and a second pole portion 122 that are molded separately, the hardness of the second pole portion 122 being greater than the hardness of the first pole portion 121, at least a portion of the first pole portion 121 being engaged outside the casing 11, and at least a portion of the second pole portion 122 being engaged inside the casing 11. The second pole portion 122 includes a first connecting portion 1222 and a second connecting portion 1224, the second connecting portion 1224 being drilled in the mounting hole 111, and the second connecting portion 1224 being formed in a ring-shaped structure that is installed to surround the inner wall of the mounting hole 111. The first connection portion 1222 is provided in the inner ring region of the second connection portion 1224 and is connected to the inner end portion of the second connection portion 1224 that is close to the active material application portion 21. A cavity 123 that is open in a direction away from the active material application portion 21 is defined between the second connection portion 1224 and the first connection portion 1222. A through hole 12221 is formed in the first connection portion 1222, and a portion of the conductive portion 22 passes through the through hole 12221 and is stored in the cavity 123 and is connected to the first connection portion 1222.

[0123] The first pole column portion 121 is located outside the casing 11 and has a ring structure, with one end away from the active material application portion 21 of the second connection portion 1224 being the outer end portion 12241, which extends to the side of the inner circumferential portion 12111 close to the central axis of the mounting hole 111, and the inner surface S12 of the inner circumferential portion 12111 facing the central axis of the mounting hole 111 is welded to the outer surface S22 of the outer end portion 12241 away from the central axis of the mounting hole 111.

[0124] The casing assembly 1 further includes a pole cover plate 13 that covers the first pole portion 121, and an insulating seal assembly 16 that insulates and connects the casing 11 and the first pole 12, and the pole cover plate 13 has an escape groove 131 formed in it that corresponds to the welding position between the outer end portion 12241 and the inner peripheral portion 12111 to accommodate welding marks, the pole cover plate 13 includes an inner fitting portion 132 that extends into the annular region of the second connecting portion 1224, and has a first gap 14 between the outer peripheral surface 1321 of the inner fitting portion 132 and the inner surface S23 of the outer end portion 12241, and the insulating seal assembly 16 includes an insulating member 161 and an insulating seal member 162 that has a heat resistance capability stronger than that of the insulating member 161, and the insulating seal member 162 is located between the welding position of the first pole portion 121 and the second pole portion 122 and the casing 11.

[0125] In the above technical solution, it is relatively difficult for the first connecting portion 1222 and the cavity 123 to securely support the casing 11, and therefore deformation is relatively likely to occur. In the present application, the first pole 12 is configured to include a first pole portion 121 and a second pole portion 122 which are formed separately, and the hardness of the second pole portion 122 is configured to be greater than that of the first pole portion 121. This reduces deformation of the first connecting portion 1222 to a certain extent, improves the connection reliability between the first connecting portion 1222 and the conductive portion 22, and improves the conductivity yield. The first pole portion 121, which has a relatively low hardness, is advantageous in improving the welding yield between the first pole portion 121 and the pole cover plate 13.

[0126] According to some embodiments of the present application, the present application further provides a battery 100 including the battery cell 10 of any one of the above embodiments.

[0127] In the above technical solution, since the battery 100 is provided with the battery cells 10 and the battery cells 10 have various designs, it is advantageous for improving the design diversity of the battery 100.

[0128] According to some embodiments of the present application, the present application further provides an electric device 1000 including the battery 100 of the above embodiments, wherein the battery 100 is used to supply electric energy to the electric device 1000.

[0129] In the above technical solution, the battery 100 is installed in the electrical device 1000, and the battery 100 can have various designs, which is advantageous for flexibly designing various batteries 100 according to the actual needs of the electrical device 1000 and optimizing the power supply needs of the electrical device 1000.

[0130] It should be noted that the embodiments and features of the embodiments of the present application can be combined with each other unless there is a contradiction.

[0131] The above is merely a preferred embodiment of the present application, and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application without departing from the spirit and principles of the present application should be included in the scope of the claims of the present application. [Explanation of symbols]

[0132] Electric device 1000, battery 100, controller 200, motor 300, case 20, first case 201, second case 202, battery cell 10, casing assembly 1, casing 11, mounting hole 111, casing main body 112, bottom cover 113, first pole 12, first pole portion 121, first stopper portion 1211, inner circumferential portion 12111, inner end surface S11 of inner circumferential portion, inner side surface S12 of inner circumferential portion, outer circumferential portion 12112, extension portion 1212, second pole portion 122, second stopper portion 1221, first connecting portion 1222, through hole 12221, second connecting portion 1224, outer end portion 12241, outer end surface S21 of outer end portion, outer side surface S22 of outer end portion, inner side surface S2 of outer end portion 3, cavity 123, sinking groove 124, recessed groove 125, pole cover plate 13, escape groove 131, internal fitting portion 132, outer peripheral surface 1321 of internal fitting portion, first gap 14, second gap 15, insulating seal assembly 16, insulating member 161, outer insulating member 1611, inner insulating member 1612, insulating seal member 162, outer step portion 1621 of insulating seal member, inner step portion 1622 of insulating seal member, insulating film 17, battery core assembly 2, active material application portion 21, current collector 211, active material layer 212, conductive portion 22, tab portion 221, tab sheet 2210, first converging portion 2211, second converging portion 2212, adapter sheet 222, first direction Z, second direction X, third direction Y.

Claims

1. A battery cell, a casing assembly including a casing having a mounting hole and a first pole drilled in the mounting hole; a battery core assembly including an active material applied portion provided within the casing and a conductive portion electrically connecting the active material applied portion and the first electrode pole; The first pole includes a first pole portion and a second pole portion which are formed separately and connected to each other, at least a portion of the first pole portion is fixed to the outside of the casing, at least a portion of the second pole portion is fixed to the inside of the casing, and the second pole portion is connected to the conductive portion. Battery cell.

2. the second electrode pillar portion includes a first connection portion, a cavity is formed in the first electrode pillar on a side of the first connection portion away from the active material application portion and / or a side of the first connection portion toward the active material application portion, at least a part of the conductive portion is accommodated in the cavity and is connected to the first connection portion, and the hardness of at least the first connection portion of the second electrode pillar portion is greater than the hardness of the first electrode pillar portion; The battery cell according to claim 1 .

3. the second pole portion further includes a second connection portion drilled in the mounting hole, the second connection portion having an annular structure disposed so as to surround the inner wall of the mounting hole, the first connection portion being provided in an inner ring region of the second connection portion and connected to an inner end of the second connection portion adjacent to the active material application portion, the second connection portion together with the first connection portion surrounding the cavity, the cavity being open in a direction away from the active material application portion, a through hole communicating with the cavity being formed in the first connection portion, and a portion of the conductive portion passing through the through hole is accommodated in the cavity. The battery cell according to claim 2 .

4. the through-hole is provided at an edge position where the first connection portion and the second connection portion are connected; The battery cell according to claim 3 .

5. the active material coated portion includes a current collector and an active material layer provided on the current collector, the conductive portion includes a tab portion electrically connected to the current collector, the tab portion includes a plurality of tab sheets, the plurality of tab sheets gather at a position close to the current collector to form a first converging portion, the plurality of tab sheets gather at a position away from the current collector and are connected to form a second converging portion, and the first converging portion is connected to the second converging portion and the active material coated portion, the conductive portion is composed of the tab portion, and at least a portion of the second convergent portion passes through the through hole and is housed in the cavity, or the conductive portion includes the tab portion and an adapter sheet, and at least a portion of the adapter sheet passes through the through hole and is housed in the cavity, and the adapter sheet is connected between the second convergent portion and the first connection portion. The battery cell according to claim 3 or 4.

6. the first pole portion is located outside the casing and has an annular structure, the second pole portion includes a second connection portion drilled in the mounting hole, the second connection portion is formed in an annular structure installed so as to surround the inner wall of the mounting hole, and one end of the second connection portion remote from the active material coated portion extends so as to be connected to the inner periphery of the first pole portion; The battery cell according to any one of claims 1 to 4.

7. an end of the second connection portion away from the active material-coated portion is defined as an outer end, and the outer end extends to a side of the inner circumferential portion that is close to the central axis of the mounting hole, and an inner surface of the inner circumferential portion that faces the central axis of the mounting hole is welded to an outer surface of the outer end that faces away from the central axis of the mounting hole; The battery cell according to claim 6 .

8. The casing assembly further includes a pole cover plate located outside the casing and covering the first pole portion, and a relief groove is formed in the pole cover plate corresponding to a welding position between the outer end portion and the inner circumferential portion to accommodate a welding mark. The battery cell according to claim 7 .

9. The pole cover plate includes an inner fitting portion extending into an inner annular region of the second connection portion, and an outer peripheral surface of the inner fitting portion and an inner surface of the outer end portion are spaced apart to form a first gap. The battery cell of claim 8 .

10. an end portion of the second connecting portion away from the active material application portion is defined as an outer end portion, the inner circumferential portion abuts against the side of the outer end portion away from the active material application portion, and an inner end surface of the inner circumferential portion facing the active material application portion is welded to an outer end surface of the outer end portion away from the active material application portion; The battery cell according to claim 6 .

11. the casing assembly further includes a pole cover plate located outside the casing and covering the first pole portion, a portion of the pole cover plate being fitted into an annular region of the inner periphery, and the pole cover plate and the inner periphery being spaced apart to form a second gap; The battery cell of claim 10.

12. the first pole portion is welded to the second pole portion; The battery cell according to any one of claims 1 to 4.

13. the first pole is provided with a recess at a welding position between the first pole portion and the second pole portion to accommodate a welding mark formed after welding the first pole portion and the second pole portion; The battery cell of claim 12.

14. the casing assembly further includes an insulating seal assembly that insulates the casing and the first pole, the insulating seal assembly including an insulating member and an insulating seal member having a heat resistance capability stronger than that of the insulating member, the insulating seal member being positioned between the casing and welding positions of the first pole portion and the second pole portion; The battery cell of claim 12.

15. the welding positions of the first electrode post portion and the second electrode post portion are located outside the mounting hole, the insulating member includes an outer insulating member interposed between the first electrode post portion and the outer wall of the casing, and an inner insulating member interposed between the second electrode post portion and the inner wall of the casing, and the insulating seal member includes an inner step portion extending into the mounting hole and having both ends in the axial direction of the mounting hole abutting against the first electrode post portion and the inner insulating member, respectively, and an outer step portion extending outside the mounting hole and having a radially inner end in the radial direction of the mounting hole connected to the inner step portion and a radially outer end abutting against the outer insulating member. The battery cell of claim 14.

16. A plurality of poles are provided on the casing, at least one of which is the first pole; The battery cell according to any one of claims 1 to 4.

17. A battery cell according to any one of claims 1 to 4, battery.

18. 18. A battery comprising the battery of claim 17. Electrical equipment.

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