End cover assembly, battery monomer, battery module and battery

Abstract

The utility model relates to an end cover assembly, a battery monomer, a battery module and a battery, the end cover assembly is used for the battery monomer, the battery monomer comprises a battery cell assembly, the battery cell assembly comprises a positive pole lug and a negative pole lug, and the end cover assembly comprises a cover body, a positive pole post, a negative pole post and a collector plate structure; the positive pole and the negative pole are arranged on the cover body; the collector plate structure comprises a positive collector plate and a negative collector plate which are insulated from each other; wherein the positive pole can be connected to the positive tab by means of a positive collector plate, and the negative pole can be connected to the negative tab by means of a negative collector plate. The space occupation of the other side of the battery can be reduced, the height of the battery is reduced, the assembly and the space layout of the battery are facilitated, and meanwhile, the short circuit risk is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to an end cap assembly, a battery cell, a battery module, and a battery. Background Art

[0002] In traditional cylindrical batteries, the positive electrode tab and the negative electrode tab are respectively led out on both sides of the cylinder, and then cover plate assemblies are respectively arranged on both sides, resulting in a large space occupied by the structures on both sides of the cylindrical battery, which is not conducive to the assembly and spatial layout of the battery. To lead out the positive electrode tab and the negative electrode tab on the same side, the problem of short circuit needs to be overcome. Summary of the Invention

[0003] Based on this, an end cap assembly, a battery cell, a battery module, and a battery are provided, which contribute to the assembly and spatial layout of the battery and reduce the risk of short circuit at the same time.

[0004] According to a first aspect of the present application, an end cap assembly for a battery cell is provided. The battery cell includes a battery core assembly, and the battery core assembly includes a positive electrode tab and a negative electrode tab. The end cap assembly includes:

[0005] A cover body;

[0006] A positive electrode terminal and a negative electrode terminal, both arranged on the cover body; and

[0007] A current collector plate structure, including a first insulating member and a positive current collector plate and a negative current collector plate that are spaced apart and oppositely arranged. The first insulating member is located between the positive current collector plate and the negative current collector plate and connects the positive current collector plate and the negative current collector plate; the first insulating member is configured as an integral structure;

[0008] Wherein, the positive electrode terminal can be connected to the positive electrode tab through the positive current collector plate, and the negative electrode terminal can be connected to the negative electrode tab through the negative current collector plate.

[0009] In some embodiments, the first insulating member is integrally formed by an injection molding method.

[0010] In some embodiments, the positive current collector plate is provided with at least one first bending portion, and the negative current collector plate is provided with at least one second bending portion; each of the first bending portions and one of the second bending portions are arranged opposite to each other along a first direction.

[0011] In some embodiments, the first insulating member is provided with at least one third bending portion; along the first direction, each of the third bending portions is located between one of the first bending portions and one of the second bending portions.

[0012] In some embodiments, the end cap assembly further includes a first fixing member and a second fixing member;

[0013] One end of the positive electrode terminal abuts against the positive current collector plate, and the other end passes through the cover body via the positive current collector plate and is relatively fixed to the cover body by means of the first fixing member;

[0014] One end of the negative electrode terminal abuts against the negative current collector plate, and the other end passes through the cover body via the negative current collector plate and is relatively fixed to the cover body by means of the second fixing member.

[0015] In some embodiments, the first fixing member and the positive electrode terminal are fixedly connected by riveting;

[0016] The second fixing member and the negative electrode terminal are fixedly connected by riveting.

[0017] In some embodiments, the end cover assembly further includes a second insulating member;

[0018] The second insulating member is disposed on a side of the cover body facing away from the current collector plate structure, and both the first fixing member and the second fixing member are disposed on the second insulating member.

[0019] In some embodiments, the second insulating member includes a mounting portion and an insulating portion;

[0020] The mounting portion includes a first part, a second part, and a third part connected in sequence. The insulating portion is disposed on the second part. The first fixing member is located on the first part, and the second fixing member is located on the third part;

[0021] The positive electrode terminal passes through the first part and is connected to the first fixing member, and the negative electrode terminal passes through the third part and is connected to the second fixing member.

[0022] In some embodiments, the second insulating member is provided with a first positioning portion and a second positioning portion, the first fixing member is provided with a first mating portion, and the second fixing member is provided with a second mating portion;

[0023] The positive electrode terminal passes through the second insulating member and is connected to the first fixing member. By means of the cooperation between the first positioning portion and the first mating portion, the positive electrode terminal is fixed relative to the first fixing member;

[0024] The negative electrode terminal passes through the second insulating member and is connected to the second fixing member. By means of the cooperation between the second positioning portion and the second mating portion, the negative electrode terminal is fixed relative to the second fixing member.

[0025] In some of these embodiments, the end cap assembly further includes a third insulating member located on a side of the current collecting plate structure facing away from the cover body; the cover body is insulated from the battery cell assembly by means of the third insulating member; and / or

[0026] The end cap assembly further includes a pressure relief member provided on the cover body.

[0027] According to a second aspect of the present application, there is provided a battery cell including a battery cell assembly and an end cap assembly as described in any one of the foregoing embodiments. The battery cell assembly includes a positive electrode tab and a negative electrode tab. The positive electrode terminal is connected to the positive electrode tab, and the negative electrode terminal is connected to the negative electrode tab.

[0028] According to a third aspect of the present application, there is provided a battery module including a plurality of the battery cells as described above.

[0029] According to a fourth aspect of the present application, there is provided a battery including the battery module as described above.

[0030] In the above-mentioned end cap assembly, battery cell, battery module and battery, the end cap assembly is used for the battery cell. The battery cell includes a battery cell assembly. The battery cell assembly includes a positive electrode tab and a negative electrode tab. The end cap assembly at least includes a cover body, a positive electrode terminal, a negative electrode terminal and a current collecting plate structure. The positive electrode terminal and the negative electrode terminal are both provided on the cover body. The current collecting plate structure includes a first insulating member and a positive current collecting plate and a negative current collecting plate that are spaced apart and oppositely arranged. The first insulating member is located between the positive current collecting plate and the negative current collecting plate and connects the positive current collecting plate and the negative current collecting plate. The positive electrode terminal is connected to the positive electrode tab of the battery cell assembly through the positive current collecting plate, and the negative electrode terminal is connected to the negative electrode tab of the battery cell assembly through the negative current collecting plate. In this way, the positive electrode tab and the negative electrode tab of the battery cell assembly can be led out on the same side of the battery cell, and the positive electrode terminal and the negative electrode terminal can be led out on the same side and insulated from each other through the current collecting plate structure, thereby reducing the space occupied on the other side of the battery cell, reducing the height of the battery cell, facilitating the assembly and spatial layout of the battery cell, and increasing the energy density of the battery cell. In addition, by constructing the first insulating member as an integral structure, the possibility of contact between the positive current collecting plate and the negative current collecting plate can be reduced, thereby reducing the short-circuit risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of an end cap assembly according to an embodiment of the present application.

[0032] Figure 2 is Figure 1 a top view schematic diagram of the end cap assembly in

[0033] Figure 3 is Figure 1 an exploded schematic diagram of the end cap assembly in

[0034] Figure 4 This is a schematic structural view of the current collector plate structure in the end cover assembly of another embodiment of the present application.

[0035] Explanation of reference numerals:

[0036] End cover assembly 10;

[0037] Cover body 11, positive electrode terminal 12, negative electrode terminal 13, current collector plate structure 14, positive current collector plate 141, negative current collector plate 142, first insulating member 143, first bending portion M1, second bending portion M2, third bending portion M3, first fixing member 15, second fixing member 16, second insulating member 17, mounting portion 171, first part 171a, second part 171b, third part 171c, insulating portion 172, first positioning portion 17a, second positioning portion 17b, third insulating member 18, pressure relief member 19, pressure relief valve 191, protection sheet 192, assembly hole Q, fixing hole S, sealing member K. Detailed implementation manners

[0038] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0040] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In this application, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In this application, unless otherwise clearly specified or limited, if there are descriptions such as a first feature being "on" or "under" a second feature, etc., its meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0044] Refer to Figures 1 to 3 , Figure 1 shows a schematic structural view of an end cap assembly in an embodiment of this application, Figure 2 shows Figure 1 a top view schematic of the end cap assembly in Figure 3 shows Figure 1Explosion schematic diagram of the end cap assembly. The end cap assembly 10 provided by an embodiment of the present application is used for a battery cell. The battery cell includes a battery core assembly (not shown in the figure). The battery core assembly includes a positive electrode tab and a negative electrode tab. The end cap assembly 10 includes a cover body 11, a positive electrode terminal 12, a negative electrode terminal 13, and a current collector plate structure 14. The positive electrode terminal 12 and the negative electrode terminal 13 are both provided on the cover body 11. The current collector plate structure 14 includes a positive current collector plate 141 and a negative current collector plate 142 that are spaced apart and oppositely arranged, and a first insulating member 143. The first insulating member 143 is located between the positive current collector plate 141 and the negative current collector plate 142 and connects the positive current collector plate 141 and the negative current collector plate 142. The first insulating member 143 is configured as an integral structure. Wherein, the positive electrode terminal 12 can be connected to the positive electrode tab by means of the positive current collector plate 141, and the negative electrode terminal 13 can be connected to the negative electrode tab by means of the negative current collector plate 142.

[0045] It should be noted that the battery cell further includes a housing (not shown in the figure). The housing has an opening. The battery core assembly is disposed inside the housing, and the end cap assembly 10 is covered on the opening.

[0046] The housing is a component for cooperating with the end cap assembly 10 to form the internal environment of the battery core assembly. The material of the housing can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The present application embodiment does not make special restrictions on this. The shape of the housing can be determined according to the specific shape and size of the battery core assembly. In this embodiment, the specific shape of the battery core assembly can be set as cylindrical. Correspondingly, the shape of the housing can also be set as cylindrical to form a cylindrical battery cell. In addition, the cylindrical battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0047] The cover body 11 is a component for covering the opening of the housing to isolate the internal environment of the battery core assembly from the external environment. Exemplarily, the cover body 11 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover body 11 is not easily deformed when being squeezed and collided. In addition, the material of the cover body 11 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The present application embodiment does not make special restrictions on this. It should be noted that functional components such as the positive electrode terminal 12 and the negative electrode terminal 13 can be provided on the cover body 11.

[0048] The cell component is a component used for electrochemical reactions in a battery cell. The cell component is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the cell component, and the parts of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body of the cell component together or at both ends of the main body respectively. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals (i.e., the electrode posts) to form a current loop. The electrode post can be used to electrically connect to the cell component for outputting or inputting the electrical energy of the cell component. It should be noted that in this embodiment, to reduce the space occupation on the other side of the battery cell, the positive electrode tab and the negative electrode tab are led out on one side of the main body of the cell component.

[0049] The positive electrode post 12 is a component used to form a current loop with the positive electrode tab. The negative electrode post 13 is a component used to form a current loop with the negative electrode tab. One end of the positive electrode post 12 / negative electrode post 13 is connected to the current collector plate structure 14, and the other end is connected to an external conductive component or the negative electrode post 13 / positive electrode post 12 of an adjacent battery cell. Generally, the shape of the positive electrode post 12 / negative electrode post 13 can be a prism or a cylinder, and the specific shape is not limited in this embodiment, and all shapes are within the protection scope of this embodiment.

[0050] The current collector plate structure 14 is a current collecting component used to lead out the current of the cell component to the electrode post. The positive current collector plate 141 is used to collect and lead out the current of the positive electrode tab of the cell component to the positive electrode post 12. The negative current collector plate 142 is used to collect and lead out the current of the negative electrode tab of the cell component to the negative electrode post 13. Exemplarily, one end of the positive current collector plate 141 can be connected to the positive electrode tab by welding, and the other end can be connected to the positive electrode post 12 by riveting or welding. One end of the negative current collector plate 142 can be connected to the negative electrode tab by welding, and the other end can be connected to the negative electrode post 13 by riveting or welding. In this embodiment, the positive current collector plate 141 and the negative current collector plate 142 can be set as a symmetrical structure, and a first insulating member 143 is arranged between the opposite sides of the positive current collector plate 141 and the negative current collector plate 142. The shape of the first insulating member 143 can be a strip shape or a wavy shape, etc., and the material of the first insulating member 143 can be an insulating material such as plastic, resin, rubber or glass, and can be specifically set according to the actual situation, and this embodiment does not limit this.

[0051] Specifically, the positive current collector plate 141 and the negative current collector plate 142 are spaced apart and oppositely arranged. The first insulating member 143 is located between the positive current collector plate 141 and the negative current collector plate 142 and connects the positive current collector plate 141 and the negative current collector plate 142. By setting the first insulating member 143 as an integral structure, there is no gap between the positive current collector plate 141 and the negative current collector plate 142, so that the possibility of contact between the positive current collector plate 141 and the negative current collector plate 142 can be reduced, and the short-circuit risk can be lowered.

[0052] Further, two assembly holes Q are formed in the cover body 11. One of the assembly holes Q allows the positive electrode terminal 12 to pass through, and the other assembly hole Q allows the negative electrode terminal 13 to pass through. The positive current collector plate 141 and the negative current collector plate 142 are respectively provided with an assembly hole Q. The positive electrode terminal 12 can sequentially pass through the assembly hole Q of the positive current collector plate 141 and one of the assembly holes Q of the cover body 11. Since the positive current collector plate 141 is connected to the positive electrode tab, the positive electrode terminal 12 can be connected to the positive electrode tab by means of the positive current collector plate 141. The negative electrode terminal 13 can sequentially pass through the assembly hole Q of the negative current collector plate 142 and the other assembly hole Q of the cover body 11. Since the negative current collector plate 142 is connected to the negative electrode tab, the negative electrode terminal 13 can be connected to the negative electrode tab by means of the negative current collector plate 142. Moreover, the positive current collector plate 141 and the negative current collector plate 142 are in an insulating state, which can reduce the risk of short circuit between the positive electrode terminal 12 and the negative electrode terminal 13, and enable the positive electrode terminal 12 and the negative electrode terminal 13 to be led out on the same side of the battery.

[0053] In this embodiment, the end cap assembly 10 is used for a battery cell. The battery cell includes a cell assembly, and the cell assembly includes a positive electrode tab and a negative electrode tab. The end cap assembly 10 at least includes a cover body 11, a positive electrode terminal 12, a negative electrode terminal 13, and a current collector plate structure 14. The positive electrode terminal 12 and the negative electrode terminal 13 are provided on the cover body 11. The current collector plate structure 14 includes a first insulating member 143, and a positive current collector plate 141 and a negative current collector plate 142 that are spaced apart and oppositely arranged. The first insulating member 143 is located between the positive current collector plate 141 and the negative current collector plate 142 and connects the positive current collector plate 141 and the negative current collector plate 142. The positive electrode terminal 12 is connected to the positive electrode tab of the cell assembly through the positive current collector plate 141, and the negative electrode terminal 13 is connected to the negative electrode tab of the cell assembly through the negative current collector plate 142. In this way, the positive electrode tab and the negative electrode tab of the cell assembly can be led out on the same side of the battery cell, and through the current collector plate structure 14, the positive electrode terminal 12 and the negative electrode terminal 13 can be led out on the same side and insulated from each other, thereby reducing the space occupied on the other side of the battery cell, reducing the height of the battery cell, facilitating the assembly and spatial layout of the battery cell, and increasing the energy density of the battery cell. In addition, compared with constructing the first insulating member 143 as a discontinuous structure, in the embodiment of the present application, the first insulating member 143 is constructed as an integral structure, which can reduce the possibility of contact between the positive current collector plate 141 and the negative current collector plate 142, thereby reducing the short-circuit risk.

[0054] In some embodiments, the first insulating member 143 is integrally formed by an injection molding method. Specifically, the first insulating member 143 can be made of a plastic material. The positive current collector plate 141 and the negative current collector plate 142 are placed relatively spaced apart, and the first insulating member 143 is formed between the positive current collector plate 141 and the negative current collector plate 142 by using an injection molding process. In this way, by integrally forming through an injection molding method, the size of the first insulating member 143 can be reasonably controlled to meet the insulation requirements of the positive current collector plate 141 and the negative current collector plate 142, and the formed first insulating member 143 is not easily detached or damaged, reducing the risk of short circuit between the positive current collector plate 141 and the negative current collector plate 142, and improving the safety performance of the battery cell.

[0055] Referring to Figure 4 , in some embodiments, the positive current collector plate 141 is provided with at least one first bending portion M1, and the negative current collector plate 142 is provided with at least one second bending portion M2. Each first bending portion M1 and a second bending portion M2 are arranged opposite to each other along the first direction F1.

[0056] It should be noted that the current collecting plate structure 14 includes a plurality of bending regions (not shown in the figure) and a plurality of non-bending regions (not shown in the figure), and each bending region connects two adjacent non-bending regions. The bending region refers to a partial region in the current collecting plate structure 14 that can be bent. The non-bending region refers to a partial region in the current collecting plate structure 14 that is not bent. The first bending portion M1 and the second bending portion M2 are both located in the bending region. The first bending portion M1 and the second bending portion M2 located in the same bending region are arranged opposite to each other along the first direction F1. The first bending portion M1 refers to the portion of the positive current collecting plate 141 that can be bent. The second bending portion M2 refers to the portion of the negative current collecting plate 142 that can be bent.

[0057] Specifically, both the first bending portion M1 and the second bending portion M2 can be configured as a stepped structure or a crease structure, which can increase the areas of the first bending portion M1 and the second bending portion M2, leaving a redundant portion for the bending operation, so that when the current collecting plate structure 14 is bent, with the help of the first bending portion M1 and the second bending portion M2, the positive current collecting plate 141 and the negative current collecting plate 142 can be folded smoothly, which helps to reduce the occurrence of breakage or deformation of the current collecting plate structure 14.

[0058] In some embodiments, the first insulating member 143 is provided with at least one third bending portion M3. Along the first direction F1, each third bending portion M3 is located between a first bending portion M1 and a second bending portion M2.

[0059] Specifically, the third bending portion M3 is located in the bending region. In the same bending region, a third bending portion M3 is located between a first bending portion M1 and a second bending portion M2. The third bending portion M3 refers to the portion of the first insulating member 143 that can be bent. The third bending portion M3 can be configured as a stepped structure or a crease structure, which can increase the area of the third bending portion M3, leaving a redundant portion for the bending operation, so that when the current collecting plate structure 14 is bent, with the help of the third bending portion M3, the first insulating member 143 can be folded smoothly, which helps to reduce the occurrence of breakage or deformation of the current collecting plate structure 14.

[0060] Please continue to refer to Figure 3 , in some embodiments, the end cap assembly 10 further includes a first fixing member 15 and a second fixing member 16. One end of the positive electrode terminal 12 abuts against the positive current collecting plate 141, and the other end passes through the cover body 11 via the positive current collecting plate 141 and is relatively fixed to the cover body 11 by means of the first fixing member 15. One end of the negative electrode terminal 13 abuts against the negative current collecting plate 142, and the other end passes through the cover body 11 via the negative current collecting plate 142 and is relatively fixed to the cover body 11 by means of the second fixing member 16.

[0061] Furthermore, the first fixing member 15 is fixedly connected to the positive electrode post 12 by riveting. The second fixing member 16 is fixedly connected to the negative electrode post 13 by riveting.

[0062] It should be noted that the first fixing member 15 is a component for fixing the positive pole 12. The second fixing member 16 is a component for fixing the negative pole 13. The first fixing member 15 and the second fixing member 16 can be plate-shaped or block-shaped, as long as they can meet the fixing requirements. The first fixing member 15 and the second fixing member 16 are both provided with fixing holes S. The cover body 11, the positive current collecting plate 141 and the negative current collecting plate 142 are all provided with assembly holes Q. It should be noted that the positive pole 12 / negative pole 13 includes a column (not shown in the figure) and a base (not shown in the figure) connected to each other, the end of the column has a flange portion (not shown in the figure), and the opening of the fixing hole S has a step portion (not shown in the figure), and the flange portion of the column can be riveted with the step portion of the fixing hole S.

[0063] Specifically, the positive electrode column 12 can pass through the assembly hole Q of the positive current collecting disk 141, one of the assembly holes Q of the cover 11, and the fixing hole S of the first fixing member 15 in sequence, and the positive electrode column 12 can be riveted to the fixing hole S of the first fixing member 15. The negative electrode column 13 can pass through the assembly hole Q of the negative current collecting disk 142, another assembly hole Q of the cover 11, and the fixing hole S of the second fixing member 16 in sequence, and the negative electrode column 13 can be riveted to the fixing hole S of the second fixing member 16. In some embodiments, the first fixing member 15 and the positive electrode column 12 can be welded and fixed at the riveted joint, and the second fixing member 16 and the negative electrode column 13 can be welded and fixed at the riveted joint. In this way, by providing the first fixing member 15 and the second fixing member 16, it is helpful to fix the positive electrode column 12 and the negative electrode column 13 relative to the cover 11 respectively.

[0064] Please continue reading Figure 3 In some embodiments, the end cover assembly 10 further includes a second insulating member 17 , which is disposed on a side of the cover body 11 away from the collecting plate structure 14 , and the first fixing member 15 and the second fixing member 16 are both disposed on the second insulating member 17 .

[0065] It should be noted that the second insulating member 17 is a member used to insulate the end of the column of the positive pole 12 / negative pole 13 from the cover 11. The material of the second insulating member 17 can be a plastic material, or a material such as resin, rubber or glass. The shape of the second insulating member 17 can be square, round or oval, and can be specifically selected according to actual needs. The technicians can call the second insulating member 17 upper plastic.

[0066] Exemplarily, two assembly holes Q are formed in the second insulating member 17. The positive electrode post 12 can sequentially pass through the assembly hole Q of the positive current collector plate 141, the corresponding assembly hole Q of the cover body 11, one of the assembly holes Q of the second insulating member 17, and the fixing hole S of the first fixing member 15, and the positive electrode post 12 is fixed relative to the cover body 11 by the first fixing member 15. The negative electrode post 13 can sequentially pass through the assembly hole Q of the negative current collector plate 142, the corresponding assembly hole Q of the cover body 11, the other assembly hole Q of the second insulating member 17, and the fixing hole S of the second fixing member 16, and the negative electrode post 13 is fixed relative to the cover body 11 by the second fixing member 16. Thus, setting the second insulating member 17 helps to improve the insulation performance of the end cover assembly 10.

[0067] Please continue to refer to Figure 3 , in some embodiments, the second insulating member 17 includes a mounting portion 171 and an insulating portion 172. The mounting portion 171 includes a first part 171a, a second part 171b, and a third part 171c that are sequentially connected. The insulating portion 172 is provided on the second part 171b. The first fixing member 15 is located on the first part 171a, and the second fixing member 16 is located on the third part 171c. The positive electrode post 12 is disposed through the first part 171a and connected to the first fixing member 15. The negative electrode post 13 is disposed through the third part 171c and connected to the second fixing member 16.

[0068] It should be noted that the mounting portion 171 may be a plate-like structure, and the insulating portion 172 may be a block-like structure. The shape of the insulating portion 172 may be square, circular, or other shapes, as long as it can insulate both sides of the mounting portion 171.

[0069] Specifically, an assembly hole Q can be formed in the first part 171a of the mounting portion 171, and an assembly hole Q can be formed in the third part 171c. The insulating portion 172 is located on the surface of the mounting portion 171 facing away from the cover body 11, and the insulating portion 172 is located between the two assembly holes Q. The positive electrode post 12 passes through the assembly hole Q in the first part 171a, and the first fixing member 15 can be installed on the first part 171a. The negative electrode post 13 passes through the assembly hole Q in the third part 171c, and the second fixing member 16 can be installed on the third part 171c. Thus, the positive electrode post 12 and the negative electrode post 13 are insulated by the insulating portion 172, reducing the risk of short circuit.

[0070] Alternatively, in some embodiments, the second insulating member 17 is provided with a first positioning portion 17a and a second positioning portion 17b, the first fixing member 15 is provided with a first mating portion (not shown in the figure), and the second fixing member 16 is provided with a second mating portion (not shown in the figure). The positive electrode terminal 12 passes through the second insulating member 17 and is connected to the first fixing member 15. By means of the cooperation between the first positioning portion 17a and the first mating portion, the positive electrode terminal 12 is fixed relative to the first fixing member 15. The negative electrode terminal 13 passes through the second insulating member 17 and is connected to the second fixing member 16. By means of the cooperation between the second positioning portion 17b and the second mating portion, the negative electrode terminal 13 is fixed relative to the second fixing member 16.

[0071] It should be noted that the first positioning portion 17a and the first mating portion are structures for positioning the first fixing member 15. The second positioning portion 17b and the second mating portion are structures for positioning the second fixing member 16. Among the first positioning portion 17a and the first mating portion, one of them is a concave portion and the other is a convex portion.

[0072] Among the second positioning portion 17b and the second mating portion, one of them is a concave portion and the other is a convex portion. The inner wall of the concave portion and the outer wall of the convex portion are in contact with each other, so that the first fixing member 15 / the second fixing member 16 is connected to the second insulating member 17. In addition. The shape of the convex portion can be cylindrical or prismatic, and its size can be specifically set according to actual needs as long as the positioning requirements can be met.

[0073] Specifically, the first fixing member 15 is covered on the second insulating member 17, and the first positioning portion 17a and the first mating portion are matched. The second fixing member 16 is covered on the second insulating member 17, and the second positioning portion 17b and the second mating portion are matched. Moreover, the first fixing member 15 and the positive electrode terminal 12 are fixed by riveting and / or welding. Combining with the cooperation between the first positioning portion 17a and the first mating portion, the rotation of the positive electrode terminal 12 can be effectively prevented; further, the second fixing member 16 and the negative electrode terminal 13 are fixed by riveting and / or welding. Combining with the cooperation between the second positioning portion 17b and the second mating portion, the rotation of the negative electrode terminal 13 can be effectively prevented.

[0074] Please continue to refer to Figure 3 , in some embodiments, the end cover assembly 10 further includes a third insulating member 18, and the third insulating member 18 is located on the side of the current collector plate structure 14 away from the cover body 11. The cover body 11 is insulated from the battery cell assembly by means of the third insulating member 18.

[0075] It should be noted that the third insulating member 18 is a component for insulating the cover body 11 from the positive and negative electrode tabs of the battery cell assembly. The material of the third insulating member 18 can be a plastic material, or materials such as resin, rubber, or glass. The shape of the third insulating member 18 can be square, circular, or oval, and can be specifically selected according to actual needs. Technicians can refer to the third insulating member 18 as the lower plastic.

[0076] Specifically, the third insulating member 18 is provided with two assembly holes Q. One of the assembly holes Q allows the positive electrode post 12 to pass through, and the other assembly hole Q allows the negative electrode post 13 to pass through. The positive electrode post 12 sequentially passes through one of the assembly holes Q of the third insulating member 18, the assembly hole Q of the positive current collector plate 141, and the corresponding assembly hole Q of the cover body 11. The negative electrode post 13 sequentially passes through the other assembly hole Q of the third insulating member 18, the assembly hole Q of the negative current collector plate 142, and the corresponding assembly hole Q of the cover body 11. In this way, by providing the third insulating member 18, it helps to improve the insulation performance of the end cover assembly 10.

[0077] Or, in some embodiments, the end cover assembly 10 further includes a pressure relief member 19, and the pressure relief member 19 is provided on the cover body 11.

[0078] It should be noted that the pressure relief member 19 is a component for preventing the battery from exploding. Specifically, the pressure relief member 19 can include a pressure relief valve 191 and a protective sheet 192. The pressure relief valve 191 is a component for releasing the internal pressure or temperature of the battery cell. The pressure relief valve 191 can adopt forms such as an explosion-proof valve, a gas valve, a safety valve, or a notch provided on the housing, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure.

[0079] Specifically, when the internal pressure or temperature of the battery cell reaches the threshold value, the pressure relief valve 191 performs an action or a weak structure provided in the pressure relief valve 191 is damaged, thereby forming a pressure relief hole (not shown in the figure) for releasing the internal pressure or temperature of the battery cell. The pressure relief hole refers to a hole formed on the housing that connects the inside and outside of the battery cell when the battery cell undergoes thermal runaway. The pressure relief hole can be formed by actuating the pressure relief valve 191. The actions generated by the pressure relief valve 191 can include but are not limited to: at least a part of the pressure relief valve 191 rupturing, breaking, being torn, or opening, etc. The protective sheet 192 is a component for protecting the pressure relief valve 191. The protective sheet 192 is provided with a ventilation hole (not shown in the figure), and this ventilation hole is used to timely release the pressure or temperature released by the pressure relief valve 191. In this way, by providing the pressure relief member 19 on the cover body 11, it helps to improve the safety performance of the battery.

[0080] Or, in some embodiments, the end cover assembly 10 further includes a sealing member K, and the sealing member K is provided between the cover body 11 and the current collector plate structure 14.

[0081] It should be noted that the seal K is a component used to seal the gap between the positive electrode terminal 12 / negative electrode terminal 13 and the cover 11. Exemplarily, the seal K can be an O-ring. Specifically, there are two seals K. One of the seals K is sleeved on the outer wall of the column body of the positive electrode terminal 12 to fill the space between the column body of the positive electrode terminal 12 and the inner wall of the corresponding assembly hole Q of the cover 11. The other seal K is sleeved on the outer wall of the column body of the negative electrode terminal 13 to fill the space between the column body of the negative electrode terminal 13 and the inner wall of the corresponding assembly hole Q of the cover 11. In this way, the sealing performance between the positive electrode terminal 12 / negative electrode terminal 13 and the cover 11 can be improved.

[0082] Based on the same inventive concept, an embodiment of the present application further provides a battery cell, which includes a cell assembly and the end cover assembly 10 as described in any one of the foregoing embodiments. The cell assembly includes a positive electrode tab and a negative electrode tab, and the end cover assembly 10 can connect the positive electrode tab and the negative electrode tab.

[0083] Based on the same inventive concept, an embodiment of the present application further provides a battery module, which includes a plurality of the foregoing battery cells.

[0084] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0085] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An end cap assembly for a battery cell, wherein the battery cell comprises a battery cell assembly, wherein the battery cell assembly comprises a positive electrode tab and a negative electrode tab, wherein: The end cap assembly comprises: Cover body; The positive electrode column and the negative electrode column are both arranged on the cover body; and A current collecting disc structure, comprising a first insulating member and a positive current collecting disc and a negative current collecting disc that are spaced apart and arranged opposite to each other, wherein the first insulating member is located between the positive current collecting disc and the negative current collecting disc and connects the positive current collecting disc and the negative current collecting disc; the first insulating member is constructed as an integrated structure; The positive electrode column can be connected to the positive electrode tab by means of the positive electrode collector disk, and the negative electrode column can be connected to the negative electrode tab by means of the negative electrode collector disk.

2. The end cap assembly according to claim 1, characterized in that: The first insulating member is integrally formed by injection molding.

3. The end cap assembly according to claim 1, characterized in that: The positive electrode current collecting disc is provided with at least one first bending portion, and the negative electrode current collecting disc is provided with at least one second bending portion; each of the first bending portions and one of the second bending portions are arranged opposite to each other along the first direction.

4. The end cap assembly according to claim 3, characterized in that: The first insulating member is provided with at least one third bending portion; along the first direction, each of the third bending portions is located between one of the first bending portions and one of the second bending portions.

5. The end cap assembly according to any one of claims 1 to 4, characterized in that: The end cap assembly also includes a first fixing member and a second fixing member; One end of the positive electrode post is in contact with the positive current collector, and the other end is passed through the cover body via the positive current collector, and is relatively fixed to the cover body by means of the first fixing member; One end of the negative electrode post is in contact with the negative electrode current collecting disk, and the other end is passed through the negative electrode current collecting disk and is relatively fixed to the cover body by means of the second fixing member.

6. The end cap assembly according to claim 5, characterized in that: The first fixing member is fixedly connected to the positive electrode post by riveting; The second fixing member is fixedly connected to the negative electrode post by riveting.

7. The end cap assembly according to claim 5, characterized in that: The end cap assembly also includes a second insulating member; The second insulating member is disposed on a side of the cover body away from the current collecting plate structure, and the first fixing member and the second fixing member are both disposed on the second insulating member.

8. The end cap assembly according to claim 7, characterized in that: The second insulating member includes a mounting portion and an insulating portion; The mounting portion comprises a first portion, a second portion and a third portion which are connected in sequence, the insulating portion is arranged at the second portion, the first fixing member is located at the first portion, and the second fixing member is located at the third portion; The positive pole is disposed through the first portion and connected to the first fixing member, and the negative pole is disposed through the third portion and connected to the second fixing member.

9. The end cap assembly according to claim 7, characterized in that: The second insulating member is provided with a first positioning portion and a second positioning portion, the first fixing member is provided with a first matching portion, and the second fixing member is provided with a second matching portion; The positive electrode column is passed through the second insulating member and connected to the first fixing member, and the positive electrode column is fixed relative to the first fixing member by means of the cooperation between the first positioning portion and the first matching portion; The negative pole is passed through the second insulating member and connected to the second fixing member, and the negative pole is fixed relative to the second fixing member by means of the cooperation between the second positioning portion and the second matching portion.

10. The end cap assembly according to any one of claims 1 to 4, characterized in that: The end cap assembly further comprises a third insulating member, the third insulating member being located on a side of the collecting plate structure away from the cover body; the cover body is insulated from the battery cell assembly by means of the third insulating member; and / or The end cover assembly further includes a pressure relief member, which is disposed on the cover body.

11. A battery cell, characterized in that: It comprises a battery cell assembly and an end cap assembly as described in any one of claims 1 to 10, wherein the battery cell assembly comprises a positive electrode tab and a negative electrode tab, the positive electrode column is connected to the positive electrode tab, and the negative electrode column is connected to the negative electrode tab.

12. A battery module, characterized in that: The invention comprises a plurality of battery cells as claimed in claim 11.

13. A battery, characterized in that: Comprising the battery module as claimed in claim 12.

Images