Current collector, battery monomer, battery pack and electric device

Abstract

The application provides a current collecting disc, a battery monomer, a battery pack and a power utilization equipment. The current collecting disc comprises a disc body and a conductive part. The conductive part comprises a plurality of lead-out sections which are stacked along the thickness direction of the lead-out sections. The conductive part further comprises at least one lead-out bending part. The lead-out bending part is respectively connected with two adjacent lead-out sections. The lead-out bending part is adapted to be bent so that the two adjacent lead-out sections are stacked along the thickness direction of the lead-out sections. Each lead-out section comprises a first connecting part and a second connecting part. The first connecting part is electrically connected with the disc body. The second connecting part is adapted to be electrically connected with a polarity part of a battery. The conductive part is an integral part. The production process of the current collecting disc is simplified, and the quality of the current collecting disc is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a current collector, a battery cell, a battery pack, and an electrical device. Background Technology

[0002] The current collector is a key internal structure of the battery. It connects the electrode core and the battery terminals. The current collector is mainly used to collect and conduct current, and it also plays a supporting and thermal management role.

[0003] The production of manifolds using related technologies requires complex processing techniques, and dust and burrs are easily generated during the production process, affecting the quality of the manifolds. Utility Model Content

[0004] This application provides a current collector, a battery cell, a battery pack, and an electrical device to simplify the manufacturing process of the current collector and improve its quality.

[0005] The first aspect of this application provides a current collector, including a disk body and a conductive element. The conductive element includes a plurality of lead-out sections, which are stacked along the thickness direction of the lead-out sections. The conductive element also includes at least one lead-out bending portion, which connects to two adjacent lead-out sections respectively. The lead-out bending portion is adapted to bend so that the two adjacent lead-out sections are stacked along the thickness direction of the lead-out sections. Each lead-out section includes a first connecting portion and a second connecting portion. The first connecting portion is electrically connected to the disk body, and the second connecting portion is adapted to be electrically connected to the polarity element of a battery. The conductive element is a single piece.

[0006] In one possible implementation, the lead-out section includes a first lead-out section and at least one second lead-out section. The first lead-out section includes a first end and a second end opposite to each other along the extension direction of the first lead-out section. The first end is connected to the second lead-out section through a lead-out bend, and the second end is connected to the disk body. The first lead-out section and the disk body are integral parts.

[0007] In one feasible manner, along the thickness direction of the disk body, the orthographic projection of the second connecting portion of the second lead-out section lies within the orthographic projection of the disk body.

[0008] In one possible implementation, the second end is connected to the circumferential edge of the disk body, and along the thickness direction of the disk body, the orthographic projection of the first connecting portion of the second lead-out section and the orthographic projection of the second end are offset.

[0009] In one feasible manner, the conductive element and the disk body are disposed separately, and along the thickness direction of the disk body, the orthographic projections of at least a portion of the first connection portion of the lead-out segment at least partially overlap.

[0010] In one feasible manner, the orthographic projections of the second connecting portions of each lead-out segment at least partially overlap along the thickness direction of the disk body.

[0011] In one possible implementation, the lead-out bend extends along the width direction of the conductive element, and the lead-out bend includes two oppositely disposed ends along its extension direction. At least one end of the lead-out bend is provided with a first positioning portion for defining the bending position of the lead-out segment.

[0012] In one feasible manner, along the extending direction of the lead-out bend, the first positioning portion is recessed from the edge provided in the width direction of the conductive element toward the center of the conductive element.

[0013] In one feasible approach, a first positioning part is provided at both ends of the bend along its extension direction.

[0014] In one possible implementation, the conductive element is provided with an encapsulation bend portion disposed between the first connecting portion and the second connecting portion, and the encapsulation bend portion is adapted to bend so that the second connecting portion extends toward the direction close to the disk body.

[0015] In one possible implementation, the encapsulation bending portion includes a first encapsulation bending portion and a second encapsulation bending portion, the first encapsulation bending portion and the second encapsulation bending portion are spaced apart, and the first encapsulation bending portion is closer to the first connecting portion relative to the second encapsulation bending portion, and the second encapsulation bending portion is closer to the second connecting portion relative to the first encapsulation bending portion.

[0016] In one possible implementation, the encapsulation bend extends along the width direction of the conductive element, the encapsulation bend includes two opposing ends along its extension direction, and at least one opposing end of the encapsulation bend is provided with a second positioning portion for defining the bending position of the encapsulation bend.

[0017] In one possible implementation, the second positioning portion is recessed from the edge opposite to the conductive element in the width direction toward the center of the conductive element.

[0018] In one possible implementation, second positioning portions are provided at both opposite ends of the encapsulated bending portion along its extension direction.

[0019] In one feasible approach, each lead-out section is provided with a vent hole that extends through the lead-out section along its thickness direction, and the vent holes on each lead-out section are interconnected.

[0020] In one possible implementation, the lead-out hole is disposed between the second encapsulation bend and the second connection portion.

[0021] In one feasible manner, at least some of the lead-out segments have the same cross-sectional area in the direction of the vertical lead-out segments.

[0022] A second aspect of this application provides a battery cell, comprising:

[0023] Polarized components, suitable for electrical connection with external circuits;

[0024] Extreme core;

[0025] The aforementioned collector plate, the plate body and the pole core are connected, and the second connection part is connected to the polarity component.

[0026] A third aspect of this application provides a battery pack including the battery cells described above.

[0027] A fourth aspect of this application provides an electrical device, including an electrical appliance and a battery cell described above, wherein the battery cell is used to supply power to the electrical appliance.

[0028] Or the battery pack mentioned above, which is used to power electrical devices.

[0029] The conductive component of this application includes multiple lead-out sections, with adjacent lead-out sections connected by lead-out bends. These bends are adapted for bending, allowing adjacent lead-out sections to be stacked together. This creates a multi-layered structure of conductive components, which can be connected to a disk and a polarity component via a first and a second connecting portion, respectively. This conductive component uses lead-out bends to connect multiple lead-out sections into a single unit. Compared to stacking multiple independent lead-out sections, this single-unit conductive component has a simpler manufacturing process and saves costs. Furthermore, this conductive component only requires bending the lead-out bends to stack multiple lead-out sections, eliminating the need for subsequent stamping and trimming. This prevents burrs or dust formation during stamping, ensuring the quality of the conductive component. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 A cross-sectional view of a battery cell provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the first type of collector disk provided in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the second type of collector disk provided in the embodiments of this application;

[0034] Figure 4 This is a schematic diagram of the structure of the third type of collector disk provided in the embodiments of this application;

[0035] Figure 5This is a schematic diagram of the structure of the fourth type of collector disk provided in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Collector plate; 10. Plate body; 11. Liquid flow hole; 12. Connecting surface; 13. Protrusion; 20. Conductive component; 21. Lead-out bend; 22. Lead-out section; 221. First lead-out section; 222. Second lead-out section; 223. First connecting part; 224. Second connecting part; 24. Encapsulation bend; 241. First encapsulation bend; 242. Second encapsulation bend; 26. First positioning part; 27. Second positioning part; 28. Vent; 200. Outer shell; 300. End cap; 301. Polar component; 400. Electrode core.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The battery cell in this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., without specific limitations. A battery cell typically includes a casing, an electrode core, and a cap. The casing has an internal cavity into which the electrode core can be housed. The cap is used to form a sealed connection with the casing to seal the electrode core within the cavity. The cap needs to form an electrical connection with the electrode core, which is usually achieved by welding, thus forming a positive or negative terminal on the cap. To establish the electrical connection between the electrode core and the cap, a current collector is also provided between the electrode core and the cap. One end of the current collector is connected to the electrode core, and the other end is connected to the cap.

[0041] The manifold in related technologies includes a flexible adapter plate and a rigid manifold plate, with a flexible connector plate connecting the manifold plates. Generally, multiple layers of flexible adapter plates need to be manufactured, and the rigid manifold plates are overlapped with these layers to form a semi-finished product. Then, the multiple layers of flexible adapter plates on the semi-finished product need to be stamped to remove excess material, stamping out the required shape and at least one welding hole. The entire assembly is then placed in a mold, and the multiple layers of flexible adapter plates are stamped and flattened to obtain the flexible connector plate. However, the aforementioned manifold requires stamping and compaction flattening processes during manufacturing, resulting in numerous steps, high production costs, and a tendency to generate dust during stamping. Furthermore, burrs easily form on the flexible adapter plates after stamping, affecting the quality of the adapter plates.

[0042] Based on the above-mentioned situation and problems, this application provides a current collector plate. This current collector plate features a structural design for its conductive components that differs from traditional technologies. The conductive components of this application are integrally formed, and the formed conductive components can be bent and stacked to form a multi-layered lead-out section stack structure, eliminating the need to separately produce and stack multiple lead-out sections. This reduces processing steps, increases efficiency, and lowers costs. Furthermore, the conductive components of this application do not require punching or compaction after bending and stacking, avoiding the generation of dust and burrs.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] Figure 1 This is a cross-sectional view of a battery cell provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the first type of collector disk provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of a second type of collector disk provided in an embodiment of this application. Wherein, Figure 2 The X-axis is parallel to the length direction of the conductive component when it is unfolded, the Y-axis is parallel to the width direction of the conductive component when it is unfolded, and the Z-axis is parallel to the thickness direction of the conductive component when it is unfolded.

[0045] It should be noted that when the conductive component 20 is unfolded, the overall thickness direction of the conductive component 20 is parallel to the thickness direction of each lead-out segment 22.

[0046] See Figures 1 to 3As shown, the battery cell provided in this embodiment includes a casing 200, an electrode core 400, an end cap 300, and a current collector 100. The casing 200 serves as a protective structure for the electrode core 400 and can be made of a metal material, such as steel or aluminum. The casing 200 has a receiving cavity inside, and the casing 200 can be designed with openings at both ends or one end. The end cap 300 can be disposed at one end of the casing 200. The electrode core 400 can be placed into the receiving cavity inside the casing 200 from the opening. One end of the current collector 100 is adapted to connect to the electrode core 400, and the other end of the current collector 100 is adapted to draw out the current from the electrode core 400. It should be noted that the battery cell also includes a polarity element 301. The other end of the current collector 100 can be connected to the polarity element 301 to draw out the current from the electrode core 400. It can be understood that the polarity element 301 can be formed by a current-guiding element separately set inside the housing 200, or it can also be formed by the end cover 300, or the polarity element 301 can also be directly formed by the housing 200. The specific way to set the polarity element 301 needs to be determined according to the actual situation, and no special limitation is made here.

[0047] The current collector 100 of this application includes a disk body 10 and a conductive element 20. The disk body 10 is used to connect the electrode core 400. Specifically, one end face of the disk body 10 can be welded to the electrode tabs led out from the electrode core 400. The disk body 10 can be used to guide the current of the electrode tabs, so the disk body 10 needs to be made of a conductive material. For example, in this application, the disk body 10 can be a metal part. However, because the positive electrode tabs and negative electrode tabs of the electrode core 400 in existing battery cells are made of different materials, the positive electrode tabs are often made of aluminum, and the negative electrode tabs are often made of copper. Due to the large differences in the coefficient of thermal expansion, melting point and other physical properties between different metal materials, defects such as cracks and pores are prone to occur during the welding process, affecting the reliability of the connection. In addition, electrochemical corrosion usually occurs at the interface where different metals come into contact, because different metals will form a potential difference in the electrolyte environment, leading to a corrosion reaction. Therefore, in order to ensure the welding stability of the disc body 10 and the electrode tab and to ensure that the connection between the disc body 10 and the electrode tab is not prone to corrosion, the material of the disc body 10 and the corresponding electrode tab need to be consistent. For example, the disc body 10 welded to the positive electrode tab can be made of aluminum, and the disc body 10 welded to the negative electrode tab can be made of copper. In addition, the disc body 10 can also be made of nickel alloy. Therefore, the disc body 10 can be made of aluminum, copper, or nickel alloy.

[0048] The conductive element 20 is a metal part, and the conductive element 20 is made of metal material. The material of the conductive element 20 can be the same as the material of the disk body 10, or it can be a different material from the material of the disk body 10. The conductive element 20 of this application is made of copper, aluminum or nickel alloy material.

[0049] The conductive element 20 of this application has multiple lead-out segments 22, each with a sheet-like structure. The multiple lead-out segments 22 are stacked along their thickness direction. The conductive element 20 also includes at least one lead-out bending portion 21. "At least one" here means that there may be one or more lead-out bending portions 21. Adjacent lead-out segments 22 are connected by the lead-out bending portions 21, forming a single integral structure, i.e., the conductive element 20 is a single piece. The lead-out bending portions 21 are designed to be easily bent. Adjacent lead-out segments 22 can be stacked along their thickness direction by bending the connected lead-out bending portions 21, thus allowing multiple lead-out segments 22 to be stacked together.

[0050] In this application, each lead-out segment 22 includes a first connecting portion 223 and a second connecting portion 224. The first connecting portion 223 of the stacked lead-out segment 22 is adapted to be electrically connected to the disk body 10, and the second connecting portion 224 is adapted to be electrically connected to the polarity member 301 of the battery. The second connecting portion 224 is located at the end of the lead-out segment 22 away from the first connecting portion 223.

[0051] The conductive component 20 of this application includes multiple lead-out segments 22. Adjacent lead-out segments 22 are connected by lead-out bending portions 21. The lead-out bending portions 21 are adapted for bending, allowing adjacent lead-out segments 22 to be stacked together by the bending of the lead-out bending portions 21. In other words, multiple lead-out segments 22 can be stacked together by the bending of the lead-out bending portions 21, forming a structure of multiple layers of lead-out segments 22. The stacked conductive component 20 can be connected to the disk body 10 and the polarity component 301 respectively through the first connecting portion 223 and the second connecting portion 224. The conductive component 20 of this application uses the lead-out bending portions 21 to connect multiple lead-out segments 22 to form a single integrated component. Compared to the stacking of multiple independent lead-out segments 22, the integrated conductive component 20 has a simpler manufacturing process and saves costs. Moreover, the conductive component 20 of this application only needs to be bent by bending the lead-out bending portion 21 to stack multiple lead-out segments 22. After stacking, no subsequent stamping and edge trimming is required, so no burrs or dust will be formed due to stamping, which helps to ensure the quality of the conductive component 20.

[0052] For example, the shape of each lead-out segment 22 may be the same or different, or some lead-out segments 22 may have the same shape while others may have different shapes. There is no specific limitation. The lead-out segments 22 may have various shapes, such as square, ellipse, trapezoid, or triangle. There is no specific limitation. In the embodiments of this application, the shape of each lead-out segment 22 is the same, and the example of each lead-out segment 22 being square is used for illustration.

[0053] It is worth mentioning that the connection positions between any two adjacent lead segments 22 can be the same or different. For example, when the shape of the lead segment 22 is square, some adjacent lead segments 22 can be connected through their two ends in the length direction, that is, one end of the length direction of one lead segment 22 is connected to one end of the lead-out bend 21, and the other end of the lead-out bend 21 is connected to one end in the length direction of another lead segment 22; or some adjacent lead segments 22 can also be connected through their ends in the width direction, that is, one end of the width direction of one lead segment 22 is connected to one end of the lead-out bend 21, and the other end of the lead-out bend 21 is connected to one end in the width direction of another lead segment 22. In this way, the conductive element 20 formed by connecting multiple lead segments 22 and lead-out bends 21 will also have different shapes when unfolded, which need to be determined according to the connection positions between adjacent lead segments 22. It is understandable that when the connection positions of two adjacent lead-out segments 22 are different, the bending method of the two adjacent lead-out segments 22 when they are stacked will also be different, and it needs to be determined according to the actual situation.

[0054] In this application, multiple lead-out segments 22 are arranged along the length direction of the lead-out segments 22, and the ends of two adjacent lead-out segments 22 are connected by lead-out bends 21, so that the length direction of the unfolded conductive member 20 is parallel to the length direction of the lead-out segments 22, and the conductive member 20 forms a long condition.

[0055] In some feasible implementations, the lead-out segment 22 includes a first lead-out segment 221 and at least one second lead-out segment 222. One or more first and second lead-out segments 221 can be provided, and the specific number needs to be determined according to actual requirements. The number of lead-out bends 21 is determined according to the number of lead-out segments 22 that need to be connected, ensuring that at least one lead-out bend 21 can connect two adjacent lead-out segments 22.

[0056] It should be noted that when multiple lead segments 22 are stacked, there are lead segments 22 located at the top and bottom layers of the stacked conductive elements 20. The lead segment 22 located at the bottom layer can be directly connected to the disk body 10 through the first connecting part 223. For ease of description, a first lead segment 221 is provided. The first lead segment 221 includes a first end and a second end in its extension direction. Its first end can be connected to one end of the extension direction of the second lead segment 222 through the lead-out bending part 21. The second end of the first lead segment 221 is connected to the disk body 10.

[0057] It is worth mentioning that the first connecting part 223 of the first lead-out section 221 is located near its second end. The first lead-out section 221 can be connected to the disk body 10 through the first connecting part 223. Specifically, it can be integrated with the disk body 10 or set separately. The following describes the different connection methods between the first lead-out section 221 and the disk body 10.

[0058] When the second end of the first lead-out segment 221 is integrally formed with the disk body 10, that is, the conductive element 20 and the disk body 10 are integrally formed. At this time, multiple second lead-out segments 222 are stacked on top of each other and then stacked on the first lead-out segment 221. In order to ensure that the stacked second lead-out segments 222 and the disk body 10 are connected, the ends of the stacked second lead-out segments 222 with the first connecting portion 223 are at least partially overlapped on the disk body 10. That is, along the thickness direction of the disk body 10, the orthographic projection of the first connecting portion 223 on the stacked second lead-out segments 222 is within the orthographic projection of the disk body 10. Then, the first connecting portion 223 of the second lead-out segments 222 is welded to the disk body 10 by welding, thereby realizing that the ends of the stacked second lead-out segments 222 are electrically connected to the disk body 10.

[0059] It should be noted that the second end of the first lead-out section 221 can be integrally formed on the circumferential edge of the disk body 10. Thus, along the thickness direction of the disk body 10, the orthographic projection of the first connecting portion 223 and the orthographic projection of the second end of the stacked second lead-out section 222 are offset, that is, the first connecting portion 223 and the second end are offset, so that the first connecting portion 223 of the stacked second lead-out section 222 can be directly connected to the disk body 10.

[0060] When the conductive element 20 and the disk body 10 are separately arranged, the first lead-out section 221 and the second lead-out section 222 of the conductive element 20 need to be stacked first, and then the ends of the stacked conductive element 20 are electrically connected to the disk body 10 by welding or bonding or other feasible methods. Specifically, after the first lead-out section 221 and the second lead-out section 222 are stacked, the extension direction of the first lead-out section 221 and the extension direction of the second lead-out section 222 are parallel, and in the thickness direction of the disk body 10, the orthographic projections of the first connecting portions 223 on the stacked first lead-out section 221 and the second lead-out section 222 overlap at least partially. In this way, the overlapping first connecting portions 223 can be connected to the disk body 10 together, and two adjacent lead-out sections 22 can be connected by the overlapping first connecting portions 223 and then connected to the disk body 10 together, which is beneficial to the stability of the connection between each lead-out section 22 and the disk body 10.

[0061] For example, the stacked lead-out segments 22 are connected to the polarity member 301 through the second connecting portion 224. Along the thickness direction of the disk body 10, the orthographic projections of the second connecting portions 224 of the stacked first lead-out segments 221 and second lead-out segments 222 at least partially overlap. This allows two adjacent second lead-out segments 222 to be connected through the overlapping second connecting portions 224 and then connected together to the polarity member 301, which is beneficial to the connection stability of the lead-out segments 22 and the polarity member 301.

[0062] In some embodiments, when multiple second lead-out segments 222 are provided, if the conductive element 20 and the disk body 10 are integrally formed by the first lead-out segment 221, and the multiple second lead-out segments 222 are connected sequentially along their extension direction, and the second lead-out segment 222 located at the end is connected to the end of the first lead-out segment 221 away from the disk body 10 through the lead-out bending portion 21, then it is necessary to set the length of a portion of the second lead-out segment 222 to be greater than the length of the first lead-out segment 221, so that when the second lead-out segment 222 is stacked on the first lead-out segment 221, the end of a portion of the second lead-out segment 222 can extend into the disk body 10 so as to be connected to the disk body 10 through the first connecting portion 223.

[0063] When the conductive element 20 and the disk body 10 are separately arranged, the lengths of the first lead-out segment 221 and the second lead-out segment 222 can be the same or different. However, it is necessary to satisfy that when the first lead-out segment 221 and the second lead-out segment 222 are stacked, along the thickness direction of the disk body 10, the orthographic projections of the first connecting portion 223 on the first lead-out segment 221 and the second lead-out segment 222 overlap at least partially, and the orthographic projections of the second connecting portion 224 on the first lead-out segment 221 and the second lead-out segment 222 overlap at least partially.

[0064] In some embodiments, at least some of the lead-out segments 22 have the same cross-sectional area in the direction perpendicular to the lead-out segments 22. Preferably, the cross-sections of some of the lead-out segments 22 overlap in the direction perpendicular to the lead-out segments 22.

[0065] In some embodiments, to accurately position the lead-out bend 21 and ensure the accuracy of the bend position, the lead-out bend 21 further includes a first positioning portion 26, which defines the bend position of the lead-out segment 22. Specifically, the lead-out bend 21 extends along the width direction of the conductive member 20, and includes two opposing ends along its extension direction, with at least one end provided with the first positioning portion 26. It is understood that the first positioning portion 26 can serve as an identifier, indicating the bend position of the lead-out bend 21 to ensure accurate bend positioning.

[0066] In some embodiments, the first positioning part 26 may be a positioning groove formed at the end of the lead-out bending part 21, or the first positioning part 26 may be a groove formed at the end of the lead-out bending part 21. There is no special limitation on this. Any structure that can play a positioning role can be considered as the first positioning part 26.

[0067] In this embodiment, the first positioning part 26 is recessed from one side of the extension direction of the lead-out bending part 21 toward the center of the conductive member 20 along the width direction of the conductive member 20, so that the first positioning part 26 is a notch structure formed at the end of the lead-out bending part 21, which makes it easy to identify the bending position of the lead-out bending part 21.

[0068] The first positioning part 26 can be of various shapes. For example, along the thickness direction of the conductive member 20, the orthographic projection of the first positioning part 26 can be a square, a triangle, or an isosceles trapezoid, etc. Any shape that is conducive to leading out the bending part 21 can be used as the shape of the first positioning part 26. This application embodiment does not make any special limitation.

[0069] In some embodiments, one or more first positioning portions 26 may be provided at the position of each lead-out bend 21. When one first positioning portion 26 is provided, the first positioning portion 26 may be located at any end of the extension direction of the lead-out bend 21. When multiple first positioning portions 26 are provided, for example, two first positioning portions 26 are provided in this embodiment, and the two first positioning portions 26 are respectively located at opposite ends along the extension direction of the lead-out bend 21. At this time, the two first positioning portions 26 may be completely equal and symmetrically arranged relative to the center of the conductive member 20.

[0070] In some embodiments, each lead-out section 22 is further provided with a vent hole 28. The vent hole 28 is provided through the lead-out section 22 along the thickness direction of the lead-out section 22. The vent hole 28 can be a round hole or an elongated hole. When the lead-out sections 22 are stacked, the vent holes 28 on the stacked lead-out sections 22 are connected.

[0071] The end of the conductive component 20 away from the disk body 10 is used for welding with the polar component 301. The vent 28 is provided on the lead-out section 22 near the second connection part 224. Furthermore, the vent 28 is provided on the second connection part 224. In this way, when the second connection part 224 is connected to the polar component 301, the generated hot air can be discharged through the vent 28 to avoid the risk of high temperature and high pressure.

[0072] Figure 4 This is a schematic diagram of the structure of the third type of collector disk 100 provided in the embodiments of this application.

[0073] See Figure 3 and Figure 4As shown, in some feasible embodiments, the conductive element 20 is further provided with an encapsulation bending portion 24, which is disposed between the first connecting portion 223 and the second connecting portion 224. The encapsulation bending portion 24 is adapted to bend, so that part of the structure of the conductive element 20 can be extended toward the direction close to the disk body 10 through the encapsulation bending portion 24. By providing the encapsulation bending portion 24, the conductive element 20 is adapted to bend, so as to facilitate the adjustment of the relative position of its second connecting portion 224 in space, and facilitate connection with the polarity element 301.

[0074] One or more encapsulation bending portions 24 may be provided, determined according to the bending requirements of the conductive component 20. The encapsulation bending portions 24 of this application include a first encapsulation bending portion 241 and a second encapsulation bending portion 242. The first encapsulation bending portion 241 and the second encapsulation bending portion 242 are provided at intervals, and the first encapsulation bending portion 241 is closer to the first connecting portion 223 relative to the second encapsulation bending portion 242, while the second encapsulation bending portion 242 is closer to the second connecting portion 224 relative to the first encapsulation bending portion 241. In this way, the conductive element 20 can be bent along its position close to the disk body 10, so that the bent part extends toward the disk body 10. After bending at this position, it can also be bent through the second encapsulation bending part 242. The length of the conductive element 20 after being bent through the first encapsulation bending part 241 and the second encapsulation bending part 242 can be reduced so that it can be assembled into the casing 200 of the battery cell. Moreover, by setting the bending of the first encapsulation bending part 241 and the second encapsulation bending part 242, it is easier to adjust the position of the conductive element 20 in space, so that it can be easily connected to the polarity element 301.

[0075] In some embodiments, to accurately position the bend 24 and ensure the accuracy of the bend position, the bend 24 further includes a second positioning portion 27, which defines the bend position of the conductive member 20. Specifically, the bend 24 extends along the width direction of the conductive member 20 and includes two opposing ends along its extension direction, at least one end of which is provided with the second positioning portion 27. It is understood that the second positioning portion 27 can serve as an identifier, indicating the bend position of the bend 24 and ensuring accurate bend positioning.

[0076] In some embodiments, the second positioning part 27 may be a positioning groove formed at the end of the encapsulation bending part 24, or the second positioning part 27 may be a groove provided at the end of the encapsulation bending part 24. There is no special limitation on this. Any structure that can play a positioning role can be considered as the second positioning part 27.

[0077] In this embodiment, the second positioning part 27 is recessed from one side of the extending direction of the encapsulation bending part 24 toward the center of the conductive member 20 along the width direction of the conductive member 20, so that the second positioning part 27 is a notch structure formed at the end of the encapsulation bending part 24, which makes it easy to identify the bending position of the encapsulation bending part 24.

[0078] The second positioning part 27 can be of various shapes. For example, along the thickness direction of the conductive member 20, the orthographic projection of the second positioning part 27 can be a square, a triangle, or an isosceles trapezoid, etc. Any shape that is conducive to the bending of the encapsulation bending part 24 can be used as the shape of the second positioning part 27. This application embodiment does not impose any special limitations.

[0079] In some embodiments, one or more second positioning portions 27 may be provided at the position of each encapsulation bend 24. When one second positioning portion 27 is provided, the second positioning portion 27 may be located at any end of the extension direction of the encapsulation bend 24. When multiple second positioning portions 27 are provided, for example, two second positioning portions 27 are provided in the embodiment of this application. The two second positioning portions 27 are located at opposite ends along the extension direction of the encapsulation bend 24. At this time, the two second positioning portions 27 may be completely equal and symmetrically arranged relative to the center of the conductive member 20.

[0080] In this embodiment, an encapsulation bending portion 24 can be provided between the first connecting portion 223 and the second connecting portion 224 of each lead-out segment 22. Specifically, the second encapsulation bending portion 242 can be positioned close to the second connecting portion 224, and the first encapsulation bending portion 241 can be positioned close to the first connecting portion 223. After multiple lead-out segments 22 are stacked, the orthographic projections of the first encapsulation bending portions 241 of each lead-out segment 22 at least partially overlap along the thickness direction of the disk body 10, and the orthographic projections of the second encapsulation bending portions 242 of each lead-out segment 22 at least partially overlap. In this way, after multiple lead-out segments 22 are stacked, an encapsulation bending portion 24 for bending can be formed on the conductive member 20, so that the conductive member 20 can be bent in the direction toward the disk body 10.

[0081] It should be noted that the thickness of each lead-out segment 22 in this application should not be too thick or too thin. The thickness of the lead-out segment 22 is 0.05mm-0.15mm. When the thickness of the lead-out segment 22 is less than 0.05mm, its strength is low and it is more likely to break during bending. When the thickness of the lead-out segment 22 is greater than 0.15mm, the lead-out segment 22 is too thick and it is difficult to bend it many times. Therefore, the thickness of the lead-out segment 22 is set to 0.05mm-0.15mm, which can ensure both the strength of the lead-out segment 22 and its ease of bending.

[0082] For example, the thickness of the lead-out segment 22 can be 0.05mm, 0.075mm, 0.1mm, 0.125mm, or 0.15mm.

[0083] Figure 5 This is a schematic diagram of the structure of the fourth type of collector disk 100 provided in the embodiments of this application.

[0084] See Figure 1 and Figure 5 As shown, in some embodiments, the conductive element 20 can be integrally formed with the disk body 10, that is, one end of the conductive element 20 is integrally formed with the disk body 10. After bending the conductive element 20, it is only necessary to weld the bent lead-out section 22 to the disk body 10. In this way, the entire structure of the current collector 100 can be processed in one go, which saves processing steps and reduces processing costs.

[0085] Alternatively, the conductive component 20 and the disk body 10 can be separately configured, meaning the conductive component 20 and the disk body 10 can be processed separately. The processed conductive component 20 can be bent and stacked, and then one end of the bent conductive component 20 can be welded to the disk body 10. This allows the conductive component 20 and the disk body 10 to be processed together, shortening processing time and increasing processing efficiency. Moreover, since the conductive component 20 and the disk body 10 are separately configured, the materials of the conductive component 20 and the disk body 10 can be different, thus allowing for flexible material selection for the conductive component 20 and the disk body 10.

[0086] In some possible implementations, the disk body 10 includes two opposing end faces along its thickness direction, one of which forms a connecting surface 12. One end of the conductive element 20 can be connected to the connecting surface 12 via a first connecting portion 223. The end face of the disk body 10 facing away from the connecting surface 12 is used to connect the battery core 400.

[0087] It should be noted that a protrusion 13 is provided on the disc body 10. The protrusion 13 is located at the end of the disc body 10 facing away from the connecting surface 12. The protrusion 13 protrudes away from the connecting surface 12. This protrusion 13 can increase the connection area between the disc body 10 and the pole core 400 to increase the stability of the connection. In addition, the protrusion 13 can also act as a reinforcing rib to increase the strength of the disc body 10. It is worth mentioning that the protrusion 13 can be a protruding structure directly protruding from the disc body 10, or the protrusion 13 can be formed by stamping the disc body 10 to deform part of the structure of the disc body 10.

[0088] In some embodiments, the disk body 10 is further provided with a liquid flow hole 11, which penetrates the disk body 10. When the disk body 10 and the electrode core 400 are connected, the liquid flow hole 11 is used to wet the electrolyte in the battery, which is beneficial to cool the connection between the disk body 10 and the electrode core 400 by the flowing electrolyte.

[0089] This application also provides a battery pack, which may include the aforementioned individual battery cells.

[0090] Specifically, the battery pack may contain multiple battery cells as described above, which may be connected in series and / or in parallel.

[0091] This application also provides an electrical device, which may include the battery cell or battery pack described in the above embodiments.

[0092] For example, when the electrical equipment is a mobile phone, tablet computer, laptop computer, or similar device, the aforementioned individual battery cells can be used as energy storage and supply devices. When the electrical equipment is a vehicle, energy storage cabinet, energy storage container, or similar device, the aforementioned battery pack can be used as an energy storage and supply device.

[0093] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0094] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A collector disk (100), characterized in that, include: Disk body (10); as well as The conductive element (20) includes a plurality of lead-out segments (22), which are stacked along the thickness direction of the lead-out segments (22); the conductive element also includes at least one lead-out bending portion (21), which connects two adjacent lead-out segments (22) respectively, and the lead-out bending portion (21) is adapted to bend so that two adjacent lead-out segments (22) are stacked along the thickness direction of the lead-out segments (22). Each of the lead-out sections (22) includes a first connecting portion (223) and a second connecting portion (224), the first connecting portion (223) being electrically connected to the disk body, and the second connecting portion (224) being adapted to be electrically connected to the polarity of the battery; The conductive component is a single piece.

2. The collector disk (100) according to claim 1, characterized in that, The lead-out section (22) includes a first lead-out section (22) and at least one second lead-out section (23). The first lead-out section (22) includes a first end and a second end that are opposite each other along the extension direction of the first lead-out section. The first end is connected to the second lead-out section (23) through the lead-out bend (21), and the second end is connected to the disk body. The first lead-out section and the disk body (10) are an integral piece.

3. The collector disk (100) according to claim 2, characterized in that, Along the thickness direction of the disk body, the orthographic projection of the second connecting portion (224) of the second lead-out section (23) is within the orthographic projection of the disk body.

4. The collector disk (100) according to claim 3, characterized in that, The second end is connected to the circumferential edge of the disk body. Along the thickness direction of the disk body, the orthographic projection of the first connecting part (223) of the second lead-out section (23) and the orthographic projection of the second end are offset.

5. The collector disk (100) according to claim 1, characterized in that, The conductive element (20) and the disk body (10) are separately disposed, and the orthographic projections of at least a portion of the first connecting portion (223) of the lead-out section (22) overlap along the thickness direction of the disk body.

6. The collector disk (100) according to any one of claims 1-5, characterized in that, Along the thickness direction of the disk body, the orthographic projections of the second connecting portion (224) of each of the lead-out sections (22) at least partially overlap.

7. The collector disk (100) according to claim 1, characterized in that, The lead-out bend (21) extends along the width direction of the conductive member (20), and the lead-out bend (21) includes two opposite ends along its extension direction. At least one end of the lead-out bend (21) is provided with a first positioning part (26) for defining the bending position of the lead-out section (22).

8. The collector disk (100) according to claim 7, characterized in that, Along the extending direction of the lead-out bend, the first positioning part (26) is recessed from the opposite edge of the conductive element (20) in the width direction toward the center of the conductive element (20).

9. The collector disk (100) according to claim 7, characterized in that, The first positioning part (26) is provided at both ends of the lead-out bending part (21) along its extension direction.

10. The collector disk (100) according to any one of claims 1-5, characterized in that, The conductive component is provided with an encapsulation bending portion (24), which is disposed between the first connecting portion (223) and the second connecting portion (224), and the encapsulation bending portion (24) is adapted to bend so that the second connecting portion (224) extends toward the direction close to the disk body.

11. The collector disk (100) according to claim 10, characterized in that, The encapsulation bending portion (24) includes a first encapsulation bending portion and a second encapsulation bending portion. The first encapsulation bending portion and the second encapsulation bending portion are spaced apart. The first encapsulation bending portion is closer to the first connecting portion (223) relative to the second encapsulation bending portion, and the second encapsulation bending portion is closer to the second connecting portion (224) relative to the first encapsulation bending portion.

12. The collector disk (100) according to claim 10, characterized in that, The encapsulation bending portion (24) extends along the width direction of the conductive member (20), and the encapsulation bending portion (24) includes two opposing ends along its extension direction. At least one opposing end of the encapsulation bending portion (24) along its extension direction is provided with a second positioning portion (27) for defining the bending position of the encapsulation bending portion (24).

13. The collector disk (100) according to claim 12, characterized in that, The second positioning part (27) is recessed from the edge of the conductive member (20) that is disposed opposite to it in the width direction towards the center of the conductive member (20) in the width direction.

14. The collector disk (100) according to claim 12, characterized in that, The second positioning part (27) is provided at both ends of the encapsulation bending part (24) along its extension direction.

15. The collector disk (100) according to claim 10, characterized in that, Each of the lead-out sections (22) is provided with a vent (28), which extends through the lead-out section (22) along the thickness direction, and the vents (28) on each lead-out section (22) are connected.

16. The collector disk (100) according to claim 15, characterized in that, The vent (28) is provided on the second connecting part (224).

17. The collector disk (100) according to any one of claims 1-5, characterized in that, In the direction perpendicular to the lead-out segment (22), at least a portion of the lead-out segment (22) has the same cross-sectional area.

18. A single battery cell, characterized in that, include: Polarized components, suitable for electrical connection with external circuits; Extreme Core (400); And, the collector disk (100) according to any one of claims 1-17, wherein the disk body (10) and the pole core (400) are connected, and the second connecting part (224) is connected to the polarity member.

19. A battery pack, characterized in that, Includes the battery cell as described in claim 18.

20. An electrical appliance, characterized in that, Includes an electrical device and a battery cell as described in claim 18, wherein the battery cell is used to supply power to the electrical device; And / or the battery pack of claim 19, wherein the battery assembly is used to power the electrical device.

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