An electrode sheet, a battery cell, a battery, a battery pack, and an electrical device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-03
AI Technical Summary
The electrolyte has difficulty fully wetting and penetrating the active dressing layer of the electrode sheet, especially the central area of the inner layer, which makes the active dressing layer prone to black spots during the use of the battery cell, affecting the performance of the battery cell.
The surface of the active dressing layer of the electrode sheet facing away from the substrate is divided into a first region and a second region. The first region is provided with multiple first wetting tanks, and the second region is provided with multiple second wetting tanks. By increasing the contact surface area between the active dressing layer and the electrolyte and the capillary action, the electrolyte is fully wetted, reducing the difficulty of wetting.
This method achieves complete electrolyte impregnation of the active dressing layer, reducing the probability of black spots appearing on the active dressing layer during battery cell charging and discharging, and improving the cycle performance and service life of the battery cell.
Smart Images
Figure CN224458101U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to an electrode sheet, a battery cell, a battery, a battery pack, and an electrical device. Background Technology
[0002] Both the positive and negative electrodes of a battery cell are made of electrode sheets. Electrode sheets generally include a substrate and an active coating layer. The active coating layer covers one or two surfaces of the substrate. During the battery cell production process, electrolyte needs to be injected to fully wet the active coating layer.
[0003] Due to the increased size of the electrode sheets and the multiple layers of electrode sheets stacked together, the electrolyte can only naturally penetrate from the edges of the electrode sheets. This makes it difficult for the electrolyte to completely penetrate and wet the inner electrode sheets, especially the central area of the inner electrode sheets. The unwetted active coating layer is prone to black spots during the use of the battery cell, affecting the performance of the battery cell. Utility Model Content
[0004] This application provides an electrode sheet, a battery cell, a battery, a battery pack, and an electrical device to solve the problem that the electrolyte is difficult to completely wet and penetrate the active coating layer of the electrode sheet, which leads to black spots easily appearing on the active coating layer during the use of the battery cell.
[0005] In a first aspect, embodiments of this application provide an electrode sheet, comprising:
[0006] Matrix;
[0007] An active dressing layer covers at least one surface of the substrate. The active dressing layer has a first region and a second region on the surface opposite to the substrate. The second region is surrounded by the second region. The first region is provided with a plurality of first impregnation grooves. The total area of the orthographic projection of all the first impregnation grooves on the substrate surface is M1 of the area of the first region. The second region is provided with a plurality of second impregnation grooves. The total area of the orthographic projection of all the second impregnation grooves on the substrate surface is M2 of the area of the second region.
[0008] Among them, M1>M2.
[0009] Secondly, embodiments of this application provide a battery cell including the electrode sheet described in the first aspect.
[0010] Thirdly, embodiments of this application provide a battery including the cell described in the second aspect.
[0011] Fourthly, embodiments of this application provide a battery pack, including the battery cell described in the second aspect or the battery described in the third aspect.
[0012] Fifthly, embodiments of this application provide an electrical device, including an electrical appliance and a battery as described in the third aspect or a battery pack as described in the fourth aspect, wherein the battery or the battery pack is used to supply power to the electrical appliance.
[0013] The above technical solution has the following beneficial effects: The electrode sheet comprises a substrate and an active dressing layer. The active dressing layer is located on at least one surface of the substrate. The surface of the active dressing layer facing away from the substrate has a first region and a second region. The first region is provided with multiple first wetting grooves, and the second region is provided with multiple second wetting grooves. During electrolyte wetting, the first and second wetting grooves increase the surface area of the active dressing layer in contact with the electrolyte and enhance capillary action, assisting the electrolyte in wetting the active dressing layer. Simultaneously, the percentage of the total area of the first wetting grooves to the area of the first region is greater than the percentage of the total area of the second wetting grooves to the area of the second region. In the electrolyte... When impregnating the active dressing layer, it needs to pass through a second region to reach the first region. That is, the portion of the active dressing layer in the first region is more difficult to impregnate than the portion in the second region. The percentage of the total area of the first impregnation tank to the area of the first region is greater than the percentage of the total area of the second impregnation tank to the area of the second region. While maximizing the cell capacity, the second and first impregnation tanks can be used to reduce the difficulty of the electrolyte impregnating the portions of the active dressing layer in the second and first regions, respectively. This allows the electrolyte to completely impregnate the active dressing layer, reducing the probability of black spots appearing on the active dressing layer during cell charging and discharging. Attached Figure Description
[0014] 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.
[0015] Figure 1 This is a schematic diagram of the structure of a first embodiment of the electrode sheet provided in this application.
[0016] Figure 2 A schematic diagram illustrating the structure of a second embodiment of the electrode sheet provided in this application;
[0017] Figure 3 A side view of one embodiment of the electrode sheet provided in this application;
[0018] Figure 4 A side view of another embodiment of the electrode sheet provided in this application;
[0019] Figure 5 A schematic diagram of the battery cell structure provided in the embodiments of this application. Figure 1 ;
[0020] Figure 6A schematic diagram of the battery cell structure provided in the embodiments of this application. Figure 2 ;
[0021] Figure 7 This is a schematic diagram of the battery structure provided in an embodiment of this application.
[0022] Explanation of reference numerals in the attached figures:
[0023] 100 - Electrode sheet, 110 - Active dressing layer, 111 - First region, 1111 - First impregnation tank, 112 - Second region, 1121 - Second impregnation tank, 113 - Third region, 1131 - Third impregnation tank, 120 - Substrate, 130 - Tab, 140 - Insulating adhesive layer, 200 - Cell, 210 - Separator, 300 - Battery, 310 - Housing, 320 - Terminal post.
[0024] The accompanying drawings have illustrated 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 specific embodiments. Detailed Implementation
[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0026] As described in the background section, whether it is a wound cell or a stacked cell, multiple positive and negative electrodes are usually arranged alternately in sequence, and the positive and negative electrodes are separated by a separator to avoid direct contact between them.
[0027] Both positive and negative electrode plates are made of electrode plates. The difference between the two is that the positive electrode plate is coated with a positive active coating layer on its substrate, while the negative electrode plate is coated with a negative active coating layer on its substrate. After multiple layers of positive and negative electrode plates are alternately arranged, the active coating layer of the middle electrode plate can only be penetrated by electrolyte at its edge. At this time, it is more difficult for electrolyte to penetrate, and the closer to the middle of the electrode plate, the more difficult it is to wet the active coating layer.
[0028] In addition, with the increasing demand for high-capacity batteries, the length and width of the electrode sheets are increasing. Moreover, in order to better ensure the energy density of the battery, the substrate is becoming thinner and thinner, while the thickness of the active coating layer on the substrate is becoming thicker and thicker, which further increases the difficulty of electrolyte wetting.
[0029] If the active coating layer cannot be completely penetrated by the electrolyte, it will have a significant impact on the battery performance. Taking lithium-ion batteries as an example, an electrochemical reaction occurs during the charging and discharging process. Lithium ions migrate between the positive and negative active coating layers, thereby generating current. If there are areas in the active coating layer that are not wetted by the electrode liquid, these unwetted areas cannot participate in the electrochemical reaction, leading to a decrease in local electrochemical performance and the formation of black spots. Black spots not only affect the appearance of the battery but may also lead to a decrease in battery performance, such as capacity loss and shortened cycle life.
[0030] To address this, this application provides an electrode sheet in which the surface of the active dressing layer facing away from the substrate has a first region and a second region. The first region is provided with multiple first wetting grooves, and the second region is provided with multiple second wetting grooves. During electrolyte wetting, the first and second wetting grooves increase the surface area of the active dressing layer in contact with the electrolyte and enhance capillary action, thus assisting the electrolyte in wetting the active dressing layer. Simultaneously, the percentage of the total area of the first wetting grooves to the area of the first region is greater than the percentage of the total area of the second wetting grooves to the area of the second region. This enhances the effectiveness of electrolyte wetting of the active dressing layer. When applying the dressing layer, it needs to pass through a second region to reach the first region. That is, the part of the active dressing layer in the first region is more difficult to wet than the part in the second region. The percentage of the total area of the first wetting tank to the area of the first region is greater than the percentage of the total area of the second wetting tank to the area of the second region. While ensuring the cell capacity as much as possible, the second wetting tank and the first wetting tank can be used to reduce the difficulty of the electrolyte wetting the active dressing layer in the second and first regions, respectively, so that the electrolyte can completely wet the active dressing layer.
[0031] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0032] This application provides an electrode sheet 100, which can be used as a positive or negative electrode sheet for a laminated battery cell, or as a positive or negative electrode sheet for a wound battery cell. Please refer to [link to relevant documentation]. Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the electrode sheet 100 includes a substrate 120 and an active dressing layer 110.
[0033] The substrate 120 is a sheet structure made of common conductive materials such as copper, aluminum, and nickel, and has two large surfaces. The active dressing layer 110 is coated on at least one of the large surfaces of the substrate 120.
[0034] The type of active material selected for the active dressing layer 110 can be determined according to the application of the active electrode sheet 100.
[0035] For example, in the lithium-ion battery 300, when the electrode sheet 100 is used as a negative electrode, the active material used in the active coating layer 110 can be lithium cobalt oxide (…). Lithium iron phosphate () ), lithium manganese oxide ( Nickel cobalt manganese oxide (NCM or NMC) or nickel cobalt aluminum oxide (NCA); when the electrode sheet 100 is used as a positive electrode sheet, the active material used in the active coating layer 110 can be graphite, silicon-based material or hard carbon or soft carbon.
[0036] For example, in the lead-acid battery 300, when the electrode sheet 100 is used as a negative electrode, the active material used in the active coating layer 110 can be lead dioxide (lead oxide). When the electrode sheet 100 is used as a positive electrode sheet, the active material used in the active dressing layer 110 can be spongy lead.
[0037] For example, in the nickel-metal hydride battery 300, when the electrode sheet 100 is used as a negative electrode, the active material used in the active coating layer 110 can be nickel hydroxide ( When the electrode sheet 100 is used as a positive electrode sheet, the active material used in the active dressing layer 110 can be a metal hydride.
[0038] It should be noted that the selection of active materials for the active dressing layer 110 is only an example and not a limitation. The specific selection can be adjusted according to the actual situation.
[0039] An active dressing layer 110 covers at least one surface of a substrate 120. The surface of the active dressing layer 110 facing away from the substrate 120 has a first region 111 and a second region 112. The first region 111 surrounds the second region 112. The first region 111 is provided with a plurality of first impregnation grooves 1111, and the second region 112 is provided with a plurality of second impregnation grooves 1121. The depth direction of the first impregnation grooves 1111 and the second impregnation grooves 1121 is the same as the thickness direction of the active dressing layer 110.
[0040] During electrolyte impregnation, the first impregnation tank 1111 and the second impregnation tank 1121 increase the surface area of the active dressing layer 110 in contact with the electrolyte, making it easier for the electrolyte to penetrate into the active dressing layer 110. Simultaneously, the first impregnation tank 1111 and the second impregnation tank 1121 also enhance capillary action, further reducing the difficulty of electrolyte penetration into the active dressing layer 110. This allows the electrolyte to completely wet the active dressing layer 110, reducing the probability of black spots appearing on the active dressing layer 110 during the charging and discharging process of the battery cell 200, and improving the cycle performance of the battery cell 200. Furthermore, the presence of the first impregnation tank 1111 and the second impregnation tank 1121 also mitigates the volume change of the active dressing layer 110 caused by electrolyte impregnation, providing space for volume changes in the active dressing layer 110, thereby contributing to enhanced mechanical stability and durability of the active dressing layer 110.
[0041] When the electrolyte wets the active dressing layer 110, the electrolyte can only move gradually from the edge of the active dressing layer 110 towards the center. This makes it more difficult for the center of the active dressing layer 110 to be completely wetted by the electrolyte than for the edge of the active dressing layer 110 to be completely wetted by the electrolyte.
[0042] After dividing the active dressing layer 110 into a first region 111 and a second region 112, it can be clearly seen that the first region 111 is closer to the middle region of the active dressing layer 110 than the second region 112, which makes the first region 111 more difficult to be wetted by the electrolyte.
[0043] In this regard, within the first region 111, the percentage of the total area of the orthographic projection of all the first impregnation tanks 1111 onto the surface of the substrate 120 to the total area of the orthographic projection of the first region 111 onto the surface of the substrate 120 is M1 (the percentage of the total area of the openings of the first impregnation tanks 1111 within the first region 111). Similarly, within the second region 112, the percentage of the total area of the orthographic projection of all the second impregnation tanks 1121 onto the surface of the substrate 120 to the total area of the orthographic projection of the second region 112 onto the surface of the substrate 120 is M2 (the percentage of the total area of the openings of the second impregnation tanks 1121 within the second region 112). In the second region 112, M1>M2, meaning that within the same area, the total area of the first wetting tank 1111 in the first region 111 is greater than the total area of the second wetting tank 1121 in the second region 112. This results in a larger surface area for the active dressing layer 110 in the first region 111 to contact the electrolyte, and stronger capillary action. This provides a stronger aid for the electrolyte to wet the active dressing layer 110 in the first region 111, allowing the electrolyte to completely wet the active dressing layer 110, reducing the probability of black spots, and thus improving the cycle performance and service life of the battery cell 200.
[0044] It should be noted that M1 can be achieved by changing the number of first immersion tanks 1111 in the first region 111 and / or the area of a single first immersion tank 1111, and M2 can be achieved by changing the number of second immersion tanks 1121 in the second region 112 and / or the area of the second immersion tanks 1121.
[0045] The substrate 120 can be coated with the active dressing layer 110 on only one large surface or on both large surfaces. When the active dressing layer 110 is coated on both large surfaces, it is more difficult for the electrolyte to completely wet the active dressing layer 110. Therefore, when the active dressing layer 110 is coated on both large surfaces of the substrate 120, the values of M1 and M2 can be appropriately increased.
[0046] For example, for most common-sized electrode sheets, M1 is 35%-60%, while if both large surfaces of the substrate 120 are coated with the active dressing layer 110, then M1 can be adjusted to 40%-60%.
[0047] For example, for most common-sized electrode sheets, M2 is 20%-45%, while if both large surfaces of the substrate 120 are coated with the active dressing layer 110, then M2 can be adjusted to 25%-45%.
[0048] Furthermore, the minimum distance between the second region 112 facing the first region 111 and the edge of the active dressing layer 110 is 10μm-150μm. Within this range, most commonly used electrode sheets 100 can be adapted for electrolyte wetting.
[0049] The range of the first region 111 and the second region 112 can be determined through actual testing. Specifically, it can be divided according to the size of the active dressing layer 110 and the part of the active dressing layer 110 that the electrolyte can enter, i.e. the difficulty of the electrolyte wetting, so as to better assist the electrolyte in completely wetting the active dressing layer 110.
[0050] For example, the second region 112 can be the region from the edge of the active dressing layer 110 to the edge of the second region 112, where the second edge is the remaining region of the surface of the active dressing layer 110 excluding the second region 112.
[0051] For example, the second region 112 has a gap between the side opposite to the first region 111 and the edge of the active dressing layer 110. In the region corresponding to this gap, no groove is provided on the active dressing layer 110. Electrolyte is more easily wetted in this part of the region without the need for assistance through a groove.
[0052] Furthermore, the area of the orthographic projection of the first impregnation tank 1111 onto the surface of the substrate 120 can be made larger than the area of the orthographic projection of the second impregnation tank 1121 onto the surface of the substrate 120, that is, the size of at least a portion of the first impregnation tank 1111 is larger than the size of the second impregnation tank 1121.
[0053] The first region 111 is closer to the middle of the active dressing layer 110, making electrolyte wetting more difficult. The second region 112 is closer to the edge of the active dressing layer 110 than the first region 111, making wetting of the first region 111 significantly more difficult than that of the second region 112. Therefore, making the area of the first wetting tank 1111 larger than that of the second wetting tank 1121 allows for a suitable area for both, meaning it does not occupy too much space, thus preserving as much of the active material content of the active dressing layer 110 as possible. At the same time, it allows for appropriate responses to the different wetting difficulties of the electrolyte, ensuring that the electrolyte can completely wet the active dressing layer 110.
[0054] For some embodiments of this application, please refer to Figure 1 and Figure 2 As shown, the surface of the active dressing layer 110 also has a third region 113, which is located between the first region 111 and the second region 112. The third region 113 is provided with a plurality of third impregnation grooves 1131, and the areas of the first impregnation groove 1111, the third impregnation groove 1131 and the second impregnation groove 1121 on the surface of the substrate 120 decrease sequentially.
[0055] For example, the active dressing layer 110 can be divided into three sequentially nested regions, each region being adapted to the shape of the active dressing layer 110. For instance, if the active dressing layer 110 is rectangular, then the second region 112 is a square frame nested outside the third region 113, and the third region 113 is a square frame nested outside the first region 111. These regions are nested sequentially, thus increasing the difficulty for the second region 112, the third region 113, and the first region 111 to be immersed in the active dressing layer 110.
[0056] The areas of the first immersion tank 1111, the third immersion tank 1131, and the second immersion tank 1121 decrease sequentially, exhibiting a gradient change, which can better match different immersion difficulties and maximize the capacity of the battery cell 200.
[0057] Furthermore, in practical applications, the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131 are mainly formed by extruding the active dressing layer 110 during the processing. For example, the active material is first coated on the substrate 120, and then the active dressing layer 110 is rolled and fixed on the substrate 120 by a pressure roller. During the rolling process, corresponding protrusions can be added to the pressure roller so that after the pressure roller extrudes the active dressing layer 110, the protrusions can extrude grooves, namely the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131, on the surface of the active dressing layer 110. The shape and size of the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131 can be determined by the protrusions. This means that the processing of the electrode sheet 100 does not require additional steps compared to the traditional electrode sheet 100, thereby avoiding additional time and costs.
[0058] The gradual reduction in the area of the first impregnation tank 1111, the third impregnation tank 1131, and the second impregnation tank 1121 also facilitates the design of the size of the protrusions on the pressure roller and reduces the processing difficulty.
[0059] It should be noted that the area of the first impregnation tank 1111 can gradually increase from the edge of the active dressing layer 110 to the center of the active dressing layer 110, the area of the third impregnation tank 1131 can gradually increase, and the area of the second impregnation tank 1121 can gradually increase, that is, the change is linear.
[0060] In addition, the depths of the first impregnation tank 1111, the second impregnation tank 1121 and the third impregnation tank 1131 can all be less than the thickness of the active dressing layer 110, which can prevent the protruding parts from making direct hard contact with the substrate 120, thereby avoiding damage to the substrate 120.
[0061] Meanwhile, the depths of the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131 are all less than the thickness of the active dressing layer 110. This can increase the contact area between the active dressing layer 110 and the electrolyte while reducing the space occupied by the active material of the active dressing layer 110 in the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131, and guide the electrolyte to better penetrate into the active dressing layer 110.
[0062] Of course, in order to match the difficulty of electrolyte wetting in different areas, the depths of the second wetting tank 1121, the third wetting tank 1131 and the first wetting tank 1111 can be increased in a gradient manner, or linearly from the edge to the middle.
[0063] Furthermore, from the active dressing layer 110 to the substrate 120, the dimensions of the first impregnation groove 1111, the second impregnation groove 1121, and the third impregnation groove 1131 gradually decrease. That is, at the end facing the substrate 120, the dimensions of the first impregnation groove 1111, the second impregnation groove 1121, and the third impregnation groove 1131 are the smallest, while at the end away from the substrate 120, the dimensions of the first impregnation groove 1111, the second impregnation groove 1121, and the third impregnation groove 1131 are the largest.
[0064] This makes it easier for the electrolyte to enter the first wetting tank 1111, the second wetting tank 1121 and the third wetting tank 1131. After the first wetting tank 1111, the second wetting tank 1121 and the third wetting tank 1131 contain part of the electrolyte, they can better guide the electrolyte to penetrate into the active dressing layer 110, thereby improving the wetting effect of the electrolyte.
[0065] At the same time, the structure of the first impregnation tank 1111, the second impregnation tank 1121, and the third impregnation tank 1131, which has a large opening and a small bottom, is relatively easy to process.
[0066] In addition, during processing, the first impregnation groove 1111, the second impregnation groove 1121 and the third impregnation groove 1131 are mainly formed by extrusion through the protruding parts on the pressure roller. In order to further reduce the risk of damage to the substrate 120, the first impregnation groove 1111, the second impregnation groove 1121 and the third impregnation groove 1131 can all be curved grooves.
[0067] The curved groove is composed of curved surfaces, such as arcs and spheres. There are no sharp areas inside, and the whole is smoothly transitioned by curved surfaces. Correspondingly, the raised parts are adapted to its shape and are also sharp parts, so they are not easy to scratch the substrate 120.
[0068] In some embodiments of this application, the electrode sheet 100 typically also includes a tab 130, which is located on one side of the substrate 120 and is electrically connected to the substrate 120, for example, by integral molding, welding or adhesive bonding. The tab 130 is mainly used to make electrical connections with the terminal post 320 of the battery 300 to realize the charging and discharging of the cell 200.
[0069] In addition, the size of the negative electrode is usually larger than that of the positive electrode. In some cases, when the electrode 100 is used as the negative electrode, an insulating adhesive layer 140 can be provided between the active coating layer 110 and the tab 130. The insulating adhesive layer 140 covers the substrate 120 and can connect the substrate 120 and the separator 210 to prevent the tab 130 from shifting and contacting the counter electrode, thereby reducing the risk of short circuit. It can also help fix the position of the substrate 120 and the separator 210, which helps to maintain the integrity of the internal structure of the cell 200. Of course, the insulating adhesive layer 140 can also improve the additional sealing ability to prevent electrolyte leakage from the tab 130 area and reduce the safety risk of the battery 300.
[0070] The insulating adhesive layer 140 can be formed using commonly used insulating adhesives, as long as they can effectively bond the substrate 120 and the diaphragm 210.
[0071] Adding the insulating adhesive layer 140 will occupy part of the space on the surface of the substrate 120, which will reduce the size of the active dressing layer 110 relative to the size of the substrate 120. However, the insulating adhesive layer 140 will also close one side of the active dressing layer 110, which will cause the electrolyte to only penetrate into the active dressing layer 110 from the area around the active dressing layer 110 excluding the insulating adhesive layer 140. This will increase the difficulty of the electrolyte penetrating the active dressing layer 110.
[0072] At this point, the values of M1 and M2 can be increased, and / or the areas of the first immersion tank 1111 and the second immersion tank 1121 can be increased, and / or the depths of the first immersion tank 1111 and the second immersion tank 1121 can be increased.
[0073] This application also provides a battery cell 200, please refer to [link to relevant documentation]. Figure 5 and Figure 6 As shown, it includes the electrode sheet 100 in the above embodiments.
[0074] The battery cell 200 also includes a separator 210. By changing the type of active material used in the active coating layer 110 of the electrode sheet 100, positive and negative electrode sheets are formed respectively. The positive and negative electrode sheets are arranged alternately in sequence, and the separator 210 is located between the positive and negative electrode sheets to separate them. That is, a layer of positive electrode sheet, a layer of separator 210, and a layer of negative electrode sheet are placed in sequence. The separator 210 prevents the positive and negative electrode sheets from directly contacting and short-circuiting. Of course, the outermost positive and negative electrode sheets are also covered with the separator 210.
[0075] It should be noted that the separator 210 is usually a microporous polymer membrane that allows ions to pass through while blocking electrons, thereby avoiding direct contact between the positive and negative electrodes.
[0076] This application also provides a battery 300, please refer to... Figure 7 As shown, it includes the battery cell 200 in the above embodiment.
[0077] Of course, the battery 300 usually also includes components such as the housing 310 and the terminal post 320. The battery cell 200 is placed inside the housing 310, and the terminal post 320 is electrically connected to the tab 130 of the battery cell 200.
[0078] This application also provides a battery pack, including the cell 200 or battery 300 in the above embodiments.
[0079] Of course, the battery pack usually also includes components such as a tray and a battery management system. The battery cells 200 or batteries 300 are fixed in the tray, while the battery management system controls the temperature of the battery cells 200 or batteries 300 and monitors various parameters of the battery cells 200 or batteries 300 to ensure the stable operation of the battery pack.
[0080] This application embodiment also provides an electrical device, including an electrical device and the battery 300 or battery pack in the above embodiment, the battery 300 or battery pack being used to supply power to the electrical device.
[0081] It should be noted that electrical equipment includes, but is not limited to, electric vehicles, hybrid vehicles, medical equipment, aerospace equipment, energy storage systems, and home electronic products that require power from batteries or battery packs.
[0082] 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.
[0083] 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. An electrode tab (100) characterized in that, include: Matrix (120); An active dressing layer (110) is provided, which covers at least one surface of the substrate (120). The surface of the active dressing layer (110) facing away from the substrate (120) has a first region (111) and a second region (112). The second region (112) is surrounded by the second region (112). The first region (111) is provided with a plurality of first impregnation grooves (1111). The total area of the orthographic projection of all the first impregnation grooves (1111) on the surface of the substrate (120) is M1 as a percentage of the area of the first region (111). The second region (112) is provided with a plurality of second impregnation grooves (1121). The total area of the orthographic projection of all the second impregnation grooves (1121) on the surface of the substrate (120) is M2 as a percentage of the area of the second region (112). Where M1 > M2.
2. The electrode pad (100) according to claim 1, characterized in that The minimum distance between the second region (112) on the side facing the first region (111) and the edge of the active dressing layer (110) is 10μm-150μm.
3. The electrode pad (100) according to claim 1, characterized in that The area of the first impregnation tank (1111) projected onto the surface of the substrate (120) is greater than the area of the second impregnation tank (1121) projected onto the surface of the substrate (120).
4. The electrode sheet (100) according to claim 3, characterized in that, The surface of the active dressing layer (110) also has a third region (113), which is located between the first region (111) and the second region (112). The third region (113) is provided with a plurality of third impregnation grooves (1131), and the areas of the first impregnation groove (1111), the third impregnation groove (1131) and the second impregnation groove (1121) on the surface of the substrate (120) decrease sequentially.
5. The electrode pad (100) according to claim 4, characterized in that The dimensions of the first impregnation tank (1111), the second impregnation tank (1121), and the third impregnation tank (1131) gradually decrease from the direction from the active dressing layer (110) to the substrate (120).
6. The electrode pad (100) according to claim 5, characterized in that The first immersion tank (1111), the second immersion tank (1121) and the third immersion tank (1131) are all curved grooves.
7. The electrode pad (100) according to any one of claims 1 to 6, characterized in that The value of M1 is 35%-60%.
8. The electrode sheet (100) according to any one of claims 1-6, characterized in that, The M2 ranges from 20% to 45%.
9. An electric core (200), characterized by, Includes the electrode sheet (100) as described in any one of claims 1-8.
10. A battery (300) characterized by Includes the battery cell (200) as described in claim 9.
11. A battery pack, characterized by Includes the cell (200) of claim 9 or the battery (300) of claim 10.
12. An electrical device, characterized by It includes an electrical device, and the battery (300) of claim 10 or the battery pack of claim 11, the battery (300) or the battery pack being used to supply power to the electrical device.