Collector plate structure, end cover assembly, battery monomer and battery

Abstract

The utility model relates to a current collecting plate structure, an end cover assembly, a battery monomer and a battery. The current collecting plate structure comprises a positive current collecting plate and a negative current collecting plate which are opposite in a first direction and are arranged at an interval, the insulating part is positioned between the positive current collecting plate and the negative current collecting plate along the first direction and is connected with the positive current collecting plate and the negative current collecting plate; the collector plate structure comprises a plurality of non-bending areas arranged at intervals in the second direction and at least one bending area capable of being bent. Each bending area is connected with two adjacent non-bending areas; the positive collector plate comprises a first bending part positioned in the bending area, and the negative collector plate comprises a second bending part positioned in the bending area; the first direction is perpendicular to the second direction. According to the technical scheme, the assembly quality of the battery can be improved while the positive pole lug and the negative pole lug are led out from the same side.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting plate structure, an end cover assembly, a battery cell and a battery. Background Art

[0002] At present, cylindrical batteries can choose to lead out the positive and negative electrode tabs on different sides respectively, or can choose to lead out the positive and negative electrode tabs on the same side at the same time. However, the integrated assembly of the components in the end cover of the latter cylindrical battery is more complicated and the assembly quality is lower. Summary of the invention

[0003] Based on this, a current collecting plate structure, an end cover assembly, a battery cell and a battery are provided, which can improve the assembly quality of the battery while meeting the requirement of leading out the positive electrode tab and the negative electrode tab on the same side.

[0004] According to a first aspect of the present application, a current collecting plate structure is provided, comprising:

[0005] A positive electrode current collecting disc and a negative electrode current collecting disc are arranged opposite to each other and spaced apart along a first direction; and

[0006] an insulating member, located between the positive electrode current collecting disk and the negative electrode current collecting disk along a first direction and connecting the positive electrode current collecting disk and the negative electrode current collecting disk;

[0007] The collecting plate structure includes a plurality of non-bending areas spaced apart along the second direction, and at least one bending area capable of bending; each bending area connects two adjacent non-bending areas;

[0008] The positive electrode current collector includes a first bent portion located in the bent area, and the negative electrode current collector includes a second bent portion located in the bent area;

[0009] The first direction and the second direction are perpendicular to each other.

[0010] In one embodiment, the first bending portion and the second bending portion located in the same bending area are arranged opposite to each other along the first direction.

[0011] In one embodiment, a plurality of bending regions are provided, and the plurality of bending regions are spaced apart along the second direction;

[0012] A first bending portion and a second bending portion which are arranged opposite to each other along a first direction are arranged in each bending area.

[0013] In one embodiment, a first avoidance portion is provided on the positive electrode current collector disk, and a second avoidance portion is provided on the negative electrode current collector disk;

[0014] At least a portion of the first avoidance portion and at least a portion of the second avoidance portion are located in the bending zone.

[0015] In one embodiment, the first avoidance portion and the second avoidance portion are arranged opposite to each other along the first direction; and / or

[0016] The first avoidance portion is configured as a notch provided at an edge of the positive electrode current collecting disk facing the negative electrode current collecting disk, and the second avoidance portion is configured as a notch provided at an edge of the negative electrode current collecting disk facing the positive electrode current collecting disk.

[0017] In one embodiment, a plurality of insulating members are provided, and the plurality of insulating members are all located in the non-bending area.

[0018] In one embodiment, an insulating member is disposed in each non-bending region; and / or

[0019] A plurality of insulating members are arranged in sequence along the second direction; and / or

[0020] The insulating member is disposed to extend longitudinally along the second direction.

[0021] In one embodiment, the insulating member is configured as an injection molded member.

[0022] In one embodiment, the positive electrode current collecting disc and the negative electrode current collecting disc are both provided with fixing holes opened along the third direction on one side facing each other;

[0023] At least part of the fixing hole accommodates a portion of the insulating member, and an orthographic projection of the fixing hole on the reference plane is located within the orthographic projection range of the insulating member on the reference plane; the reference plane is a plane perpendicular to the third direction;

[0024] The first direction, the second direction and the third direction are perpendicular to each other.

[0025] In one of the embodiments, a fixing hole located on the positive electrode current collecting disk is defined as a first fixing hole, a plurality of first fixing holes are provided, and the plurality of first fixing holes are arranged at intervals along the second direction; and / or

[0026] The fixing hole located on the negative electrode current collecting disk is defined as a second fixing hole. A plurality of second fixing holes are provided, and the plurality of second fixing holes are arranged at intervals along the second direction.

[0027] In one embodiment, the positive electrode current collecting disk further includes a plurality of positive electrode current collecting sections located in the non-bending area and arranged sequentially along the second direction, and two adjacent positive electrode current collecting sections are connected by means of a first bending portion; the first positive electrode current collecting section is used to be electrically connected to the positive electrode ear, and the last positive electrode current collecting section is used to be electrically connected to the positive electrode column;

[0028] The negative electrode current collecting plate also includes a plurality of negative electrode current collecting sections located in the non-bending area and arranged sequentially along the second direction, and two adjacent negative electrode current collecting sections are connected by means of a second bending portion; the first negative electrode current collecting section is used to be electrically connected to the negative electrode ear, and the last negative electrode current collecting section is used to be electrically connected to the negative electrode column.

[0029] In one embodiment, at least one positive current collecting section is disposed between the first positive current collecting section and the last positive current collecting section, and at least one negative current collecting section is disposed between the first negative current collecting section and the last negative current collecting section.

[0030] According to a second aspect of the present application, an end cap assembly is provided, comprising a positive electrode post, a negative electrode post and a current collecting plate structure as in any of the previous embodiments; the positive electrode post is electrically connected to one end of the positive current collecting plate, and the negative electrode post is electrically connected to one end of the negative current collecting plate.

[0031] According to a third aspect of the present application, a battery cell is provided, comprising a battery cell assembly and an end cover assembly as described in the aforementioned embodiment, wherein the battery cell assembly comprises a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is electrically connected to the other end of the positive electrode collector plate, and the negative electrode tab is electrically connected to the other end of the negative electrode collector plate.

[0032] According to a fourth aspect of the present application, a battery is provided, comprising a plurality of battery cells according to the aforementioned embodiments.

[0033] In the above-mentioned current collecting plate structure, end cover assembly, battery cell and battery, by arranging an insulating part connected between the positive current collecting plate and the negative current collecting plate, the current collecting plate structure can meet the requirements of leading out the positive electrode ear and the negative electrode ear on the same side of the battery cell assembly, and by arranging a first bending portion located in the bending zone on the positive current collecting plate, and arranging a second bending portion located in the bending zone on the negative current collecting plate, the current collecting plate structure can be bent with the help of the first bending portion and the second bending portion, thereby reducing the breakage or deformation of the current collecting plate structure during folding and assembly, thereby helping to improve the assembly quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of a current collecting plate in one embodiment of the present application.

[0035] Figure 2 for Figure 1 Schematic diagram of the back structure of the collecting plate structure.

[0036] Figure 3 for Figure 1 Schematic diagram of the structure of the collecting plate in the folded state.

[0037] Figure 4 for Figure 1 Schematic diagram of the partial structure of the collecting plate structure.

[0038] Figure 5 for Figure 3 Schematic side view of .

[0039] Figure 6 It is a schematic diagram of the explosion structure of a battery cell in one embodiment of the present application.

[0040] Description of Figure Numbers:

[0041] Battery cell 100;

[0042] Battery cell assembly 110, positive electrode tab 1101, negative electrode tab 1102;

[0043] End cap assembly 120, positive electrode column 1201, negative electrode column 1202, first plastic part 1203, cover plate 1204, second plastic part 1205, first rivet 1206, second rivet 1207, sealing part W;

[0044] Housing 130, sealing pin 130a, sealing ring 130b;

[0045] Collecting plate structure 10;

[0046] Bending area u1, non-bending area u2;

[0047] A positive electrode current collecting disc 11, a positive electrode current collecting section 11a, a first positive electrode current collecting section 11a1, a second positive electrode current collecting section 11a2, and a third positive electrode current collecting section 11a3;

[0048] Negative electrode current collecting plate 12, negative electrode current collecting section 12a, first negative electrode current collecting section 12a1, second negative electrode current collecting section 12a2, third negative electrode current collecting section 12a3;

[0049] Insulation member 13;

[0050] A first bending portion M1 and a second bending portion M2;

[0051] A first avoidance portion a1, a second avoidance portion a2;

[0052] A first fixing hole k1 and a second fixing hole k2;

[0053] A first through hole e1 and a second through hole e2;

[0054] A first welding surface s11, a second welding surface s12;

[0055] The first direction F1 and the second direction F2. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0057] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0058] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0062] Figure 1 A schematic diagram of the structure of the current collecting plate in an embodiment of the present application is shown. Figure 2 Shows Figure 1 Schematic diagram of the back structure of the collector plate structure, Figure 3 Shows Figure 1 Schematic diagram of the structure of the collecting plate in the folded state, Figure 4 Shows Figure 1 A partial structural diagram of the collecting plate structure in FIG. 1 is provided, and for ease of explanation, only the part related to the embodiment of the present application is shown.

[0063] See also Figures 1 to 4 , a current collecting disc structure 10 provided in an embodiment of the present application includes a positive current collecting disc 11, a negative current collecting disc 12 and an insulating member 13. The positive current collecting disc 11 and the negative current collecting disc 12 are arranged opposite to each other and spaced apart along a first direction F1. The insulating member 13 is located between the positive current collecting disc 11 and the negative current collecting disc 12 along the first direction F1 and connects the positive current collecting disc 11 and the negative current collecting disc 12. Among them, the current collecting disc structure 10 includes a plurality of non-bending areas u2 spaced apart along a second direction F2, and at least one bending area u1 that can be bent. Each bending area u1 connects two adjacent non-bending areas u2. The positive current collecting disc 11 includes a first bending portion M1 located in the bending area u1, and the negative current collecting disc 12 includes a second bending portion M2 located in the bending area u1. The first direction F1 and the second direction F2 are perpendicular to each other.

[0064] Specifically, the positive current collector 11 refers to a component used to conduct the current of the positive electrode tab in the battery to the positive electrode column. The negative current collector 12 refers to a component used to conduct the current of the negative electrode tab in the battery to the negative electrode column. The insulating member 13 refers to a component used to insulate and isolate the positive current collector 11 and the negative current collector 12. The bending area u1 refers to a partial area of ​​the current collector structure 10 that can be bent. The non-bending area u2 refers to a partial area of ​​the current collector structure 10 that is not bent. The first bending portion M1 refers to a portion of the positive current collector 11 that can be bent. The second bending portion M2 refers to a portion of the negative current collector 12 that can be bent. In this embodiment, the number of bending areas u1 can be one or more, which can be set according to actual conditions, and this embodiment is not limited here.

[0065] In the same bending area u1, the number of the first bending portion M1 can be one or more, and the number of the second bending portion M2 can also be one or more. In addition, the first bending portion M1 can be integral or discontinuous, and the second bending portion M2 can be integral or discontinuous, which can be determined according to actual conditions. Figure 4 As shown, the first bending portion M1 can be constructed as a step structure. The second bending portion M4 can also be constructed as a step structure. By constructing the first bending portion M1 and the second bending portion M2 as a step structure, the area of ​​the bending area u1 can be increased. When the current collecting plate structure 10 is bent, the positive current collecting plate 11 and the negative current collecting plate 12 can be smoothly folded with the help of the first bending portion M1 and the second bending portion M2, and the current collecting plate structure 10 can be reduced from breaking or deformation. In other embodiments, the first bending portion M1 and the second bending portion M2 can also be constructed as a crease structure, which can be specifically set according to actual conditions.

[0066] In the current collecting plate structure 10 of the present embodiment, by providing an insulating member 13 connected between the positive current collecting plate 11 and the negative current collecting plate 12, the current collecting plate structure 10 can meet the requirement of leading out the positive electrode tab and the negative electrode tab on the same side of the battery cell assembly, and a first bending portion M1 located in the bending area u1 is provided on the positive current collecting plate 11, and a second bending portion M2 located in the bending area u1 is provided on the negative current collecting plate 12, which can reduce the breakage or deformation of the current collecting plate structure 10 during folding and assembly, thereby helping to improve the assembly quality of the battery.

[0067] Continue reading Figure 1 In some embodiments, the first bending portion M1 and the second bending portion M2 located in the same bending area u1 are arranged one by one opposite to each other along the first direction F1. Specifically, in the same bending area u1, one first bending portion M1 is provided, and one second bending portion M2 is provided, and along the first direction F1, one end of the first bending portion M1 and one end of the second bending portion M2 are arranged opposite to each other and spaced apart. In this way, when the collecting plate structure 10 is folded and assembled, the first bending portion M1 and the second bending portion M2 located in the same bending area u1 can be bent at the same time, which can reduce the possibility of the collecting plate structure 10 being broken or deformed during the bending process, and improve the assembly quality of the collecting plate structure 10.

[0068] In some embodiments, a plurality of bending zones u1 are provided, and the plurality of bending zones u1 are spaced apart along the second direction F2. A first bending portion M1 and a second bending portion M2 that are relatively arranged along the first direction F1 are provided in each bending zone u1. Specifically, in the present embodiment, the number of bending zones u1 may be two, and the number of non-bending zones u2 may be three. In other embodiments, the arrangement may be made according to actual conditions. A first bending portion M1 and a second bending portion M2 that are relatively arranged along the first direction F1 are provided in each bending zone u1. In this way, when the current collecting plate structure 10 is bent in each bending zone u1, the positive current collecting plate 11 and the negative current collecting plate 12 can be bent at the same time, and a plurality of bending zones u1 are provided, so that the current collecting plate structure 10 can be easily folded and assembled.

[0069] Continue reading Figures 1 to 3 In some embodiments, a first avoidance portion a1 is provided on the positive electrode current collecting disc 11, and a second avoidance portion a2 is provided on the negative electrode current collecting disc 12. At least a portion of the first avoidance portion a1 and at least a portion of the second avoidance portion a2 are located in the bending area u1. Further, the first avoidance portion a1 and the second avoidance portion a2 are arranged one by one opposite to each other along the first direction F1.

[0070] Specifically, the first avoidance portion a1 refers to a structure in which the positive current collector 11 avoids in the bending zone u1. The second avoidance portion a2 refers to a structure in which the negative current collector 12 avoids in the bending zone u1. Further, along the first direction F1, the first avoidance portion a1 and the second avoidance portion a2 are arranged relative to each other. Further, by arranging at least a portion of the first avoidance portion a1 and at least a portion of the second avoidance portion a2, both are located in the bending zone u1. In this way, by arranging the first avoidance portion a1 and the second avoidance portion a2, part of the bending zone u1 can be thinned, so that the positive current collector 11 is bent at the first avoidance portion a1, and the negative current collector 12 is bent at the second avoidance portion a2.

[0071] Further, the first avoidance portion a1 is configured as a notch provided at the edge of the positive electrode current collecting disk 11 facing the negative electrode current collecting disk 12, and the second avoidance portion a2 is configured as a notch provided at the edge of the negative electrode current collecting disk 12 facing the positive electrode current collecting disk 11. Specifically, the first avoidance portion a1 and the second avoidance portion a2 are both configured as notches. In this way, the distance between the first avoidance portion a1 and the second avoidance portion a2 along the first direction F1 is greater than the distance between the positive electrode current collecting disk 11 and the negative electrode current collecting disk 12 along the first direction F1, thereby reducing the risk of contact short circuit between the positive electrode current collecting disk 11 and the negative electrode current collecting disk 12.

[0072] Continue reading Figure 1In some embodiments, a plurality of insulating members 13 are provided, and the plurality of insulating members 13 are all located in the non-bending area u2. Specifically, the plurality of insulating members 13 are arranged at intervals and are all located in the non-bending area u2, and each insulating member 13 connects the positive current collector 11 and the negative current collector 12. Further, an insulating member 13 is provided in each non-bending area u2, so that the positive current collector 11 and the negative current collector 12 are isolated by insulation. Further, the plurality of insulating members 13 are arranged in sequence along the second direction F2, that is, the plurality of insulating members 13 are arranged at intervals along the second direction F2. Further, the insulating member 13 is provided to extend longitudinally along the second direction F2, and the length direction (that is, the longitudinal extension direction) of each insulating member 13 is parallel to the second direction F2. In this way, when the current collector structure 10 is folded and assembled, the insulating member 13 can be avoided from being bent, which helps to improve the assembly quality of the current collector structure 10.

[0073] In some embodiments, the insulating member 13 is configured as an injection molded part. Specifically, the insulating member 13 can be manufactured between the positive current collector 11 and the negative current collector 12 by using an injection molding process, so as to play the role of insulating and isolating the positive current collector 11 and the negative current collector 12, and at the same time, it can enhance the connection strength between the insulating member 13 and the positive current collector 11, and enhance the connection strength between the insulating member 13 and the negative current collector 12.

[0074] In some embodiments, the positive electrode current collector 11 and the negative electrode current collector 12 are provided with fixing holes opened along the third direction (i.e., the thickness direction of the current collector structure 10) on one side facing each other. At least part of the fixing hole accommodates a portion of the insulating member 13, and the orthographic projection of the fixing hole on the reference plane is located within the orthographic projection range of the insulating member 13 on the reference plane. The reference plane is a plane perpendicular to the third direction. The first direction F1, the second direction F2 and the third direction are perpendicular to each other.

[0075] Specifically, the shape of the fixing hole can be a rectangular hole or a cylindrical hole, which can be set according to actual conditions. In this embodiment, the fixing hole is located in the non-bending area u2. When the insulating part 13 is made by the injection molding process, the injection molding slurry is poured between the positive current collector 11 and the negative current collector 12 in the non-bending area u2, and the injection molding slurry is immersed in the fixing hole. In this way, after the integrally formed insulating part 13 is made between the positive current collector 11 and the negative current collector 12, the risk of the insulating part 13 falling off can be reduced by the limiting effect of the fixing hole on the insulating part 13.

[0076] Continue reading Figure 1In some embodiments, the fixing hole located on the positive current collector 11 is defined as a first fixing hole k1, and a plurality of first fixing holes k1 are provided, and the plurality of first fixing holes k1 are arranged at intervals along the second direction F2. Further, the fixing hole located on the negative current collector 12 is defined as a second fixing hole k2, and a plurality of second fixing holes k2 are provided, and the plurality of second fixing holes k2 are arranged at intervals along the second direction F2. Specifically, in the non-bending area u2, a plurality of first fixing holes k1 are provided at intervals along the second direction F2 on the side of the positive current collector 11 facing the negative current collector 12, and a plurality of second fixing holes k2 are provided at intervals along the second direction F2 on the side of the negative current collector 12 facing the positive current collector 11.

[0077] In this way, when the insulating member 13 is manufactured by the injection molding process, by providing the first fixing hole k1 and the second fixing hole k2, the risk of the insulating member 13 falling off can be reduced, and the connection strength between the insulating member 13 and the positive electrode collector 11, and the connection strength between the insulating member 13 and the negative electrode collector 12 can be effectively improved.

[0078] Continue reading Figures 1 to 4 , and combined with Figure 5 In some embodiments, the positive current collecting disk 11 further includes a plurality of positive current collecting segments 11a located in the non-bending area u2 and sequentially arranged along the second direction F2, and two adjacent positive current collecting segments 11a are connected by means of a first bending portion M1; the first positive current collecting segment 11a is used to be electrically connected to the positive electrode ear, and the last positive current collecting segment 11a is used to be electrically connected to the positive electrode column; the negative current collecting disk 12 further includes a plurality of negative current collecting segments 12a located in the non-bending area u2 and sequentially arranged along the second direction F2, and two adjacent negative current collecting segments 12a are connected by means of a second bending portion M2; the first negative current collecting segment 12a is used to be electrically connected to the negative electrode ear, and the last negative current collecting segment 12a is used to be electrically connected to the negative electrode column.

[0079] Specifically, two adjacent positive current collecting segments 11a are connected by means of a first bending portion M1, and two adjacent negative current collecting segments 12a are connected by means of a second bending portion M2, and the first bending portion M1 and the second bending portion M2 are arranged relatively to each other along the first direction F1, so that when the current collecting plate structure 10 is folded and assembled, each positive current collecting segment 11a can be folded under the action of the first bending portion M1, and at the same time, each negative current collecting segment 12a can be folded under the action of the second bending portion M2.

[0080] Furthermore, a first welding surface s11 is provided on the first positive current collecting segment 11a, and a second welding surface s12 is provided on the first negative current collecting segment 12a. The first welding surface s11 of the first positive current collecting segment 11a is welded to the first kneaded surface of the positive electrode ear, and the second welding surface s12 of the first negative current collecting segment 12a is welded to the second kneaded surface of the negative electrode ear, so as to realize that the positive current collecting plate 11 is electrically connected to the positive electrode ear, and the negative current collecting plate 12 is electrically connected to the negative electrode ear.

[0081] Furthermore, a first through hole e1 is provided on the last positive current collecting segment 11a, and a second through hole e2 is provided on the last negative current collecting segment 12a. The first through hole e1 is used for the positive electrode column to pass through, and the second through hole e2 is used for the negative electrode column to pass through, so as to realize that the positive current collecting disc 11 is electrically connected to the positive electrode column, and the negative current collecting disc 12 is electrically connected to the negative electrode column.

[0082] In this way, the positive electrode tab and the negative electrode tab can be led out on the same side of the battery cell assembly, and at the same time, the breakage or deformation of the collecting plate structure 10 during the folding and assembly process can be reduced, which helps to improve the assembly quality of the collecting plate structure 10.

[0083] In some embodiments, continue to refer to Figure 1 and Figure 5 , at least one positive current collecting section 11a (that is, the first positive current collecting section 11a1) and the last positive current collecting section 11a (the third positive current collecting section 11a3) are provided between each other, and at least one negative current collecting section 12a (that is, the second negative current collecting section 12a2) is provided between each other. Specifically, in the present embodiment, a positive current collecting section 11a is provided between the first positive current collecting section 11a and the last positive current collecting section 11a to form a three-section structure. Accordingly, a negative current collecting section 12a may also be provided between the first negative current collecting section 12a and the last negative current collecting section 12a to form a three-section structure. In this way, it is convenient to fold and assemble the collecting plate structure 10 , and it is also helpful to thin the folded collecting plate structure 10 , which is beneficial to the spatial layout of the end cover assembly.

[0084] See also Figure 6 Based on the same inventive concept, an embodiment of the present application also provides an end cover assembly 120, including a positive electrode column 1201, a negative electrode column 1202 and a current collecting plate structure 10 as in any of the previous embodiments; the positive electrode column 1201 is electrically connected to one end of the positive current collecting plate 11, and the negative electrode column 1202 is electrically connected to one end of the negative current collecting plate 12.

[0085] In some embodiments, the end cap assembly 120 further includes a first plastic part 1203, a cover plate 1204, and a second plastic part 1205. The second plastic part 1205, the cover plate 1204, the first plastic part 1203, and the current collecting disk structure 10 are sequentially stacked along the thickness direction of the end cap assembly 120. The positive electrode column 1201 sequentially passes through the first through hole e1 of the positive current collecting disk 11, the first plastic part 1203, the cover plate 1204, and the second plastic part 1205, and a portion of the positive electrode column 1201 is exposed to the second plastic part 1205, and the exposed portion of the positive electrode column 1201 is riveted with a first rivet 1206. The negative pole 1202 passes through the second through hole e2 of the negative current collecting disc 12 , the first plastic part 1203 , the cover plate 1204 and the second plastic part 1205 in sequence, and the negative pole 1202 is exposed from the second plastic part 1205 , and the exposed part of the negative pole 1202 is riveted with a second rivet 1207 .

[0086] Furthermore, the end cap assembly 120 also includes a seal W. The seal W is disposed between the cover plate 1204 and the first plastic part 1203. It should be noted that two seals W are provided, one of which is used to seal the gap between the positive pole 1201 and the cover plate 1204, and the other seal W is used to seal the gap between the negative pole 1202 and the cover plate 1204. Exemplarily, the seal W can adopt a sealing ring structure. One of the seals W is used to be sleeved on the outer wall of the column of the positive pole 1201, so as to fill between the inner wall of the assembly hole corresponding to the column of the positive pole 1201 and the cover plate 1204. Another seal W is sleeved on the outer wall of the column of the negative pole 1202, so as to fill between the inner wall of the assembly hole corresponding to the column of the negative pole 1202 and the cover plate 1204. In this way, the sealing between the positive electrode column 1201 and the cover plate 1204 can be improved, and the sealing between the negative electrode column 1202 and the cover plate 1204 can be improved.

[0087] Continue reading Figure 6 Based on the same inventive concept, the embodiment of the present application also provides a battery cell 100, including a battery cell assembly 110 and an end cover assembly 120 as in the aforementioned embodiment, the battery cell assembly 110 includes a positive electrode tab 1101 and a negative electrode tab 1102, the positive electrode tab 1101 is electrically connected to the other end of the positive electrode collecting plate 11, and the negative electrode tab 1102 is electrically connected to the other end of the negative electrode collecting plate 12.

[0088] In some embodiments, the battery cell 100 further includes a housing 130, and the battery cell assembly 110 is sleeved in the housing 130. Furthermore, a sealing pin 130a and a sealing ring 130b are provided at one end of the battery cell assembly 110 away from the end cap assembly 120. The sealing pin 130a can be inserted into the winding axis of the battery cell assembly 110, and the sealing ring 130b is sleeved on the sealing pin 130a, so as to achieve a sealing protection effect on the battery cell assembly 110.

[0089] Based on the same inventive concept, the present application also provides a battery, comprising a plurality of battery cells 100 as in the above-mentioned embodiment. Figure 1 and Figure 6 As shown, for the current collecting plate structure 10 of each battery cell 100, an insulating member 13 is provided to be connected between the positive current collecting plate 11 and the negative current collecting plate 12, so that the current collecting plate structure 10 can meet the requirement of leading out the positive pole ear 1101 and the negative pole ear 1102 on the same side of the battery cell assembly 110, and a first bending portion M1 located in the bending area u1 is provided on the positive current collecting plate 11, and a second bending portion M2 located in the bending area u1 is provided on the negative current collecting plate 12, which can reduce the breakage or deformation of the current collecting plate structure 10 during folding and assembly, thereby helping to improve the assembly quality of the battery.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A current collecting plate structure, characterized in that: include: A positive electrode current collecting disc and a negative electrode current collecting disc are arranged opposite to each other and spaced apart along a first direction; and an insulating member, located between the positive electrode current collecting disk and the negative electrode current collecting disk along the first direction and connecting the positive electrode current collecting disk and the negative electrode current collecting disk; Wherein, the collecting plate structure comprises a plurality of non-bending areas spaced apart along the second direction, and at least one bending area capable of bending; each of the bending areas connects two adjacent non-bending areas; The positive electrode current collector includes a first bending portion located in the bending area, and the negative electrode current collector includes a second bending portion located in the bending area; The first direction and the second direction are perpendicular to each other.

2. The collecting plate structure according to claim 1, characterized in that: The first bending portion and the second bending portion located in the same bending zone are arranged opposite to each other one by one along the first direction.

3. The collecting plate structure according to claim 2, characterized in that: There are a plurality of bending areas, and the plurality of bending areas are spaced apart along the second direction; Each of the bending regions is provided with a first bending portion and a second bending portion which are arranged opposite to each other along the first direction.

4. The current collecting plate structure according to any one of claims 1 to 3, characterized in that: The positive electrode current collector is provided with a first avoidance portion, and the negative electrode current collector is provided with a second avoidance portion; At least a portion of the first avoidance portion and at least a portion of the second avoidance portion are located in the bending zone.

5. The collecting plate structure according to claim 4, characterized in that: The first avoiding portion and the second avoiding portion are arranged opposite to each other one by one along the first direction; and / or The first avoidance portion is configured as a notch provided at an edge of the positive electrode current collecting disk facing the negative electrode current collecting disk, and the second avoidance portion is configured as a notch provided at an edge of the negative electrode current collecting disk facing the positive electrode current collecting disk.

6. The current collecting plate structure according to any one of claims 1 to 3, characterized in that: A plurality of insulating members are provided, and the plurality of insulating members are all located in the non-bending area.

7. The collecting plate structure according to claim 6, characterized in that: Each of the non-bending areas is provided with an insulating member; and / or The plurality of insulating members are arranged in sequence along the second direction; and / or The insulating member is disposed to extend longitudinally along the second direction.

8. The current collecting plate structure according to any one of claims 1 to 3, characterized in that: The insulating member is configured as an injection molded member.

9. The current collecting plate structure according to any one of claims 1 to 3, characterized in that: The positive electrode current collecting disc and the negative electrode current collecting disc are both provided with fixing holes opened along the third direction on one side facing each other; At least part of the fixing hole accommodates part of the insulating member, and the orthographic projection of the fixing hole on the reference plane is located within the orthographic projection range of the insulating member on the reference plane; the reference plane is a plane perpendicular to the third direction; The first direction, the second direction, and the third direction are perpendicular to each other.

10. The collecting plate structure according to claim 9, characterized in that: The fixing hole located on the positive electrode current collecting disk is defined as a first fixing hole, a plurality of the first fixing holes are provided, and the plurality of the first fixing holes are arranged at intervals along the second direction; and / or The fixing hole located on the negative electrode current collecting plate is defined as a second fixing hole, a plurality of the second fixing holes are provided, and the plurality of the second fixing holes are arranged at intervals along the second direction.

11. The current collecting plate structure according to any one of claims 1 to 3, characterized in that: The positive current collecting plate further comprises a plurality of positive current collecting sections located in the non-bending area and arranged in sequence along the second direction, and two adjacent positive current collecting sections are connected by means of the first bending portion; the first positive current collecting section is used to be electrically connected to the positive electrode ear, and the last positive current collecting section is used to be electrically connected to the positive electrode column; The negative electrode current collecting plate also includes a plurality of negative electrode current collecting segments located in the non-bending area and arranged sequentially along the second direction, and two adjacent negative electrode current collecting segments are connected via a second bending portion; the first negative electrode current collecting segment is used to be electrically connected to the negative electrode ear, and the last negative electrode current collecting segment is used to be electrically connected to the negative electrode column.

12. The current collecting plate structure according to claim 11, characterized in that: At least one positive current collecting section is provided between the first positive current collecting section and the last positive current collecting section, and at least one negative current collecting section is provided between the first negative current collecting section and the last negative current collecting section.

13. An end cap assembly, characterized in that: It comprises a positive electrode column, a negative electrode column and a current collecting plate structure as described in any one of claims 1 to 12; the positive electrode column is electrically connected to one end of the positive current collecting plate, and the negative electrode column is electrically connected to one end of the negative current collecting plate.

14. A battery cell, characterized in that: It comprises a battery cell assembly and an end cap assembly as claimed in claim 13, wherein the battery cell assembly comprises a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is electrically connected to the other end of the positive electrode collector plate, and the negative electrode tab is electrically connected to the other end of the negative electrode collector plate.

15. A battery, characterized in that: The invention comprises a plurality of battery cells as claimed in claim 14.

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