Pole piece, battery cell and battery
By providing the first main body region in the insulating layer of the lithium-ion battery electrode sheet, the problem of recessing of the electrode sheet during the thermal pressing process is solved, and the adhesion of the edge of the electrode sheet and the cycling performance of the battery cell are improved.
Patent Information
- Application Number
- CN202421499410.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-06-27
AI Technical Summary
During the process of thermal compression forming of the lithium-ion battery electrode sheet, the depression at the electrode ear region of the battery cell connection leads to a decrease in the adhesion of the electrode sheet edge, affecting the cycling performance of the battery cell.
By providing the first main body region in the insulating layer of the electrode sheet, the thickness is thicker, thereby increasing the thickness of the edge of the electrode sheet, reducing the accumulation of thickness differences, and improving the overall thickness uniformity of the electrode sheet.
It effectively reduces the depression at the electrode area of the battery cell connection, makes the overall stress of the battery cell more uniform, improves the adhesion at the edge of the electrode sheet, and improves the structural stability and cycling performance of the battery cell.
Smart Images
Figure CN222995412U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and particularly to an electrode sheet, an electric core, and a battery. Background Art
[0002] A battery is a component that converts chemical energy into electrical energy and has a very wide range of applications in daily life and work. For example, lithium-ion batteries are often used in various electronic devices such as mobile phones, cameras, laptops, and tablets to provide power for the electronic devices. They play a very important role in people's life and work.
[0003] A lithium-ion battery includes an electrode sheet. The electrode sheet includes a current collector and an active layer coated on the current collector. Generally, during the process of coating the active layer on the current collector, the portion of the active layer near the edge has a thinning area, and the thickness of the thinning area is usually relatively thin. The thickness of the thinning area usually differs from the thickness of the main body area of the active layer by several micrometers. After multiple winding or stacking processes, the thickness difference will accumulate, making the thickness difference between the edge and the main body area of the electrode sheet reach several millimeters. During the hot pressing and forming process of the electrode sheet, a depression will appear on one side where the electric core is connected to the tab, that is, the side where the thinning area is located, causing less pressure on the edge of the electrode sheet and reducing the adhesiveness at the edge of the electrode sheet, seriously affecting the cycle performance of the electric core. Summary of the Utility Model
[0004] The present application provides an electrode sheet, an electric core, and a battery, which can effectively reduce the depression at the tab connection area of the electric core, make the stress of the whole electric core more uniform, and improve the adhesiveness at the edge of the electrode sheet.
[0005] One aspect of the present application provides an electrode sheet, including a current collector and an active layer located on the current collector;
[0006] The insulating layer includes a first main body area and a first side area close to the active layer;
[0007] The thickness of the first side area of the insulating layer is less than the thickness of the main body area of the insulating layer;
[0008] The current collector includes a connected electrode piece area and a tab area. The active layer is located in the electrode piece area, and the first main body area of the insulating layer is located in the tab area.
[0009] In an embodiment of the present application, the first main region of the insulating layer can be located in the tab region. The first main region of the insulating layer is the thickest part of the insulating layer. Since the first main region is located in the tab region and has a relatively large thickness, the thickness at the edge of the electrode can be increased. By making the difference between the thickness at the edge region of the electrode and the thickness at the middle of the electrode smaller, the overall thickness uniformity of the electrode can be effectively improved. In this way, after the electrode is wound or stacked, the accumulation of thickness differences can be effectively reduced, and the thickness difference between the middle main part and the edge of the battery cell can be effectively reduced. During the hot pressing and forming process of the electrode, the depression at the tab connection region of the battery cell can be reduced, making the overall stress of the battery cell more uniform, thereby effectively improving the adhesiveness at the edge of the electrode, enhancing the overall structural stability of the battery cell, and further improving the cycle performance of the battery cell.
[0010] In a possible implementation manner, the ratio of the thickness of the first side region of the insulating layer to the thickness of the first main region of the insulating layer is 0.95 - 1.
[0011] In a possible implementation manner, the insulating layer further includes a second side region, which is located on the side of the first main region away from the active layer, and the thickness of the second side region is less than the thickness of the first main region.
[0012] In a possible implementation manner, the thickness of the insulating layer gradually decreases from the highest point of the first main region towards the direction close to the active layer; and / or
[0013] The thickness of the insulating layer gradually decreases from the highest point of the first main region towards the direction away from the active layer.
[0014] In a possible implementation manner, the active layer includes a connected second main region and an edge region, and the edge region is located between the second main region and the insulating layer;
[0015] The ratio of the thickness of the second main region to the average thickness of the edge region is 0.95 - 1.05.
[0016] In a possible implementation manner, the ratio of the height of the highest point of the first main region to the thickness of the highest point of the second main region of the active layer is 1:1 - 1:4.
[0017] In a possible implementation manner, from one end of the edge region close to the second main region to the other end of the edge region away from the second main region, the thickness of the edge region gradually decreases, and the ratio of the maximum thickness of the edge region to the thickness of the second main region is 0.98 - 1.03.
[0018] In a possible implementation manner, it further includes a miscible region, which is located between the edge region and the first side region of the insulating layer;
[0019] The ratio of the width of the edge region to the thickness of the miscible region is 1 to 5.
[0020] In a possible implementation, the ratio of the distance from the highest point of the first main region to the edge region to the width of the edge region is 1 to 3.
[0021] In a possible implementation, the ratio of the thickness of the miscible region to the thickness of the second main region is 0.95 to 1.03.
[0022] In a possible implementation, the ratio of the width of the miscible region to the thickness of the highest point of the first main region is 2 to 10.
[0023] The second aspect of the present application provides an electric core, which includes a first electrode tab, a second electrode tab and a separator, and the first electrode tab is the electrode tab described in any one of the above.
[0024] In a possible implementation, along the first direction of the electric core, the edge of the miscible region of the first electrode tab does not exceed the edge of the second electrode tab;
[0025] And / or, the highest point of the insulating layer of the first electrode tab is located outside the second electrode tab.
[0026] The third aspect of the present application provides a battery, including the electric core described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0028] Figure 1 It is a schematic structural diagram of an electrode tab provided by an embodiment of the present application;
[0029] Figure 2 It is a schematic structural diagram of a current collector provided by an embodiment of the present application;
[0030] Figure 3 It is a cross-sectional view of an electrode tab provided by an embodiment of the present application;
[0031] Figure 4 It is a physical diagram of an electrode tab provided by an embodiment of the present application.
[0032] REFERENCE NUMERALS
[0033] 100 - electrode tab;
[0034] 110 - current collector;
[0035] 111 - Current collector area;
[0036] 112 - Tab area;
[0037] 120 - Active layer;
[0038] 121 - Second main area;
[0039] 122 - Edge area;
[0040] 130 - Insulating layer;
[0041] 131 - First main area;
[0042] 132 - First side area;
[0043] 133 - Second side area;
[0044] 140 - Miscible zone. Detailed implementation manners
[0045] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0046] As described in the background art above, a lithium-ion battery includes an electrode sheet, and the electrode sheet includes a current collector and an active layer coated on the current collector. Usually, during the process of coating the active layer on the current collector, the portion of the active layer near the edge has a thinning area, and the thickness of the thinning area is usually relatively thin, and the thickness of the thinning area usually differs from that of the main area of the active layer by several micrometers.
[0047] After multiple winding or laminating operations, the thickness difference will accumulate, resulting in a difference in thickness between the edge and the main area of the electrode sheet reaching several millimeters. During the hot pressing and forming process of the electrode sheet, a depression will appear on one side of the cell connection tab area, causing less pressure on the edge of the electrode sheet and reducing the adhesiveness at the edge of the electrode sheet.
[0048] Moreover, after the electrode sheet is wound or stacked, a depression will be generated on one side of the cell connection tab area, which has an adverse effect on the appearance of the cell.
[0049] To solve the above problems, an embodiment of the present application provides a pole piece. By making the first main region of the insulating layer located in the tab region and the thickness of the first main region being relatively thick, the thickness at the edge of the pole piece can be increased. Making the difference between the thickness of the edge region of the pole piece and the thickness in the middle of the pole piece smaller can effectively improve the thickness uniformity of the overall pole piece. In this way, after the pole piece is wound or stacked, the accumulation of the thickness difference can be effectively reduced, and the thickness difference between the middle main part and the edge of the battery cell can be effectively reduced. During the hot pressing and forming process of the pole piece, the depression at the tab connection region of the battery cell can be reduced, making the force on the overall battery cell more uniform, thereby effectively improving the adhesiveness at the edge of the pole piece and enhancing the overall structural stability of the battery cell.
[0050] The following will describe in detail the pole piece provided by the embodiment of the present application with reference to the accompanying drawings.
[0051] Figure 1 It is a schematic structural diagram of a pole piece provided by an embodiment of the present application. Figure 2 It is a schematic structural diagram of a current collector provided by an embodiment of the present application. Figure 3 It is a cross-sectional view of a pole piece provided by an embodiment of the present application.
[0052] An embodiment of the present application provides a pole piece 100. The pole piece 100 can be a positive pole piece, and the positive pole piece can be stacked with a negative pole piece to form a battery cell. Refer to Figure 1 As shown, the pole piece 100 may include a current collector 110, an active layer 120, and an insulating layer 130 located on the current collector 110.
[0053] Among them, the insulating layer 130 may include a first main region 131 and a first side region 132 close to the active layer 120. The thickness of the first side region 132 of the insulating layer 130 is less than the thickness of the first main region 131 of the insulating layer 130.
[0054] For example, the demarcation point between the first side region 132 and the first main region 131 can be determined in the following way: in the direction from the first side region 132 of the insulating layer 130 to the first main region 131 of the insulating layer 130, every 50 μm is used as a test point, and the position where the thickness increase rate between two adjacent test points is less than 1% is the demarcation point between the first side region 132 and the first main region 131.
[0055] Refer to Figure 2 As shown, the current collector 110 may include a pole piece region 111 and a tab region 112 connected to each other. For example, the tab region 112 can be cut out on the current collector 110 by means such as cutting. For example, after the insulating layer 130 is dot - set on the current collector 110, the pole piece 100 can be cut or trimmed to form the tab region 112.
[0056] Combined with Figure 3As shown, the active layer 120 can be located in the tab area 111, and the first main area 131 of the insulating layer 130 can be located in the tab ear area 112. The first main area 131 of the insulating layer 130 can be understood as the thickest part of the insulating layer 130. The first main area 131 is located in the tab ear area 112 and has a relatively large thickness, which can increase the thickness at the edge of the electrode plate 100. Making the difference in thickness between the edge area and the middle thickness of the electrode plate 100 smaller can effectively improve the overall thickness uniformity of the electrode plate 100. In this way, after the electrode plate 100 is wound or stacked, the accumulation of thickness differences can be effectively reduced, and the thickness difference between the middle main part and the edge of the battery cell can be effectively reduced. During the hot pressing and forming process of the electrode plate 100, the depression at the tab ear area 112 where the battery cells are connected can be reduced, making the force on the overall battery cell more uniform, thereby effectively improving the adhesiveness at the edge of the electrode plate 100 and enhancing the overall structural stability of the battery cell.
[0057] For example, the forming material of the insulating layer 130 can be any one of boehmite, alumina, or polyimide. The above materials all have good insulation properties, which can effectively improve the insulation performance of the insulating layer 130, effectively reduce or avoid battery short circuits, and thus effectively improve the safety of the battery.
[0058] Among them, the ratio of the thickness of the first side area 132 of the insulating layer 130 to the thickness of the first main area 131 of the insulating layer 130 can be 0.95 - 1. This can effectively reduce the thickness difference between the first main area and the first side area of the insulating layer, and can effectively improve the overall thickness uniformity of the insulating layer. It helps to improve the thickness uniformity and consistency of the overall electrode plate, thereby effectively improving the stability and reliability of the adhesion at the edge of the electrode plate.
[0059] Continue to refer to Figure 3 As shown, the insulating layer 130 can further include a second side area 133. The second side area 133 can be located on the side of the first main area 131 away from the active layer 120, and the thickness of the second side area 133 can be less than the thickness of the first main area 131.
[0060] Correspondingly, the demarcation point between the second side area 133 and the first main area can also be determined by the demarcation point determination method between the first side area and the first main area, which will not be elaborated here.
[0061] It can be understood that the insulating layer 130 slides downwards from the first main area 131 to the surroundings. Moreover, a first side area 132 is formed on the side of the first main area 131 close to the active layer 120, and a second side area 133 is formed on the side of the first main area 131 away from the active layer 120.
[0062] For example, the thickness of the insulating layer 130 may gradually decrease from the highest point of the first main region 131 towards the active layer 120. And / or, the thickness of the insulating layer 130 may gradually decrease from the highest point of the first main region 131 away from the active layer 120.
[0063] For example, the insulating layer 130 may be dropped onto the current collector 110 by means of dispensing. After the insulating layer 130 is dropped onto the current collector 110, the insulating layer 130 may extend around, and as the insulating layer 130 extends outwards, the thickness of the insulating layer 130 will gradually thin. The thickness of the middle part of the insulating layer 130 is relatively the thickest, and the insulating layer 130 forms a first side region 132 with a relatively thin thickness at the edge on the side close to the active layer 120. A second side region 133 with a relatively thin thickness is formed at the edge on the side away from the active layer 120. The part with the largest middle thickness of the insulating layer 130 is the first main region 131 of the insulating layer 130, where the highest point of the first main region 131 is the highest point of the entire insulating layer 130.
[0064] For example, when the insulating layer 130 is provided by means of dispensing, the insulating layer 130 may be dropped onto the tab region 112 so that the first main region 131 of the insulating layer 130 falls on the tab region 112, so that the thickest part of the insulating layer 130 falls on the tab region 112, thereby effectively reducing the thickness difference between the edge region and the middle region of the electrode sheet 100, and effectively improving the thickness uniformity of the entire electrode sheet 100.
[0065] Continue to refer to Figure 3 As shown, the active layer 120 may include a second main region 121 and an edge region 122. The edge region 122 may be provided at at least one side edge of the second main region 121. For example, the edge region may be at least located between the second main region 121 and the insulating layer 130.
[0066] Among them, the demarcation point between the second main region 121 and the edge region 122 may also refer to the above method. For example, in the direction from the edge region 122 of the active layer 120 to the second main region 121 of the active layer 120, every 50 μm is used as a test point, and the position where the thickness increase rate between two adjacent test points is less than 1% is the demarcation point between the second main region 121 and the edge region 122.
[0067] The ratio of the thickness of the second main region 121 to the average thickness of the edge region 122 is 0.95 to 1.05. That is, the difference between the thickness of the edge region 122 and the thickness of the second main region 121 is relatively small.
[0068] For example, the active layer 120 can be disposed on the current collector 110 by coating. Specifically, before coating the active layer 120 on the current collector, two rows of tapes can be pasted on the current collector 110 with a gap therebetween. The active layer 120 is coated between the two rows of tapes so that the active layer 120 fills the gap between the two rows of tapes. During the coating process of the active layer 120, the active layer 120 can be coated more evenly at the part between the two tapes, such that the thinner thinning area on the active layer 120 is located on the tapes.
[0069] After the coating and drying of the active layer 120 are completed, the tapes can be torn off, leaving only the active layer 120 on the current collector 110. During the process of tearing off the tapes, the thinner area of the active layer 120 located on the tapes will be removed from the current collector 110 together with the tapes, leaving only the second main body area 121 and the edge area 122 of the active layer 120.
[0070] Among them, the thickness difference between the edge area 122 and the second main body area 121 is small, which can effectively improve the overall uniformity of the active layer 120. In this way, the thickness difference between the second main body area 121 and the edge area 122 of the active layer 120 can be effectively reduced, making the thickness of the active layer 120 on the current collector 110 more uniform. After the electrode sheet 100 is wound or stacked, the accumulation of the thickness difference can be effectively reduced, and the thickness difference between the middle main body part and the edge of the battery cell can be effectively reduced. During the hot pressing and forming process of the electrode sheet 100, the depression at the battery cell connection tab area 112 can be reduced, making the force on the whole battery cell more uniform, thereby effectively improving the adhesiveness at the edge of the electrode sheet 100 and enhancing the overall structural stability of the battery cell.
[0071] Moreover, the reduction of the depression on one side of the battery cell connection tab area 112 can also reduce the adverse impact on the appearance of the battery cell, which is beneficial to improving the aesthetics of the battery cell.
[0072] Continue to refer to Figure 3 As shown, the height d4 of the highest point of the first main body area 131 and the thickness d4 ratio of the highest point of the second main body area 121 of the active layer 120 are 1:1 - 1:4. Among them, the thickness of the second main body area 121 of the active layer 120 is relatively uniform. Therefore, the thickness of the highest point of the second main body area 121 can be understood as the thickness d4 of the second main body area 121. In this way, the thickness of the coating on the current collector can be made more uniform. During the hot pressing and forming process of the electrode sheet 100, the depression at the battery cell connection tab area 112 can be reduced, making the force on the whole battery cell more uniform, thereby effectively improving the adhesiveness at the edge of the electrode sheet 100 and enhancing the overall structural stability of the battery cell.
[0073] Continue to refer to Figure 3As shown, from one end of the edge region 122 of the active layer 120 close to the second main region 121 to the end of the edge region 122 far from the second main region 121, the thickness of the edge region 122 can gradually decrease. Among them, referring to Figure 2 As shown, the maximum thickness of the edge region 122 can be d2, the thickness of the second main region 121 can be d1, and the ratio between d2 and d1 can be 0.98 to 1.03. Among them, the maximum thickness of the edge region 122 is the thickness of the edge region 122 at the end close to the second main region 121. In this way, the difference in thickness between the highest point of the edge region 122 and the thickness of the second main region 121 can be small, which can improve the overall thickness uniformity of the active layer 120, thereby effectively improving the adhesiveness at the edge of the electrode sheet 100 and enhancing the overall structural stability of the battery cell.
[0074] Figure 4 This is a physical diagram of an electrode sheet provided by an embodiment of the present application.
[0075] Continue to refer to Figure 1 and Figure 3 As shown, the electrode sheet 100 may further include a miscible region 140. Combining Figure 4 As shown, the miscible region 140 may be located between the edge region 122 of the active layer 120 and the insulating layer 130, and the miscible region 140 is a region where the active layer 120 and the insulating layer 130 are mixed. For example, when the insulating layer 130 drips onto the current collector 110, it will spread around and extend to the edge of the active layer 120. After the insulating layer 130 extends to the edge of the active layer 120, it will be mixed with the active layer 120 to form the miscible region 140.
[0076] Combining Figure 1 and Figure 3 As shown, w1 may be the width of the active layer 120, w4 may be the width from the highest point of the insulating layer 130 (i.e., the highest point of the first main region 131) to the miscible region 140, and w5 may be the width from the highest point of the insulating layer 130 (i.e., the highest point of the first main region 131) to the end of the insulating layer 130 far from the miscible region 140. It can be understood that the intersecting part between w4 and w5 is the highest point of the insulating layer 130, that is, the intersecting part of w4 and w5 is located on the tab region 112. By making the first main region 131 of the insulating layer 130 located on the tab region 112, that is, the highest point of the insulating layer 130 is located on the tab region 112, in this way, the amount of the insulating layer 130 material extending to the miscible region 140 can be small, which can increase the proportion of the active layer 120 material in the miscible region 140 and contribute to improving the energy density of the battery.
[0077] Among them, continue to refer to Figure 3As shown, the width of the edge region 122 can be w2, the thickness of the miscible region 140 can be d3, and the ratio between w2 and d3 can be 1 to 5. This can make the width of the edge region 122 of the active layer 120 smaller, reducing or avoiding the problem that the negative electrode cannot completely cover the positive electrode plate 100 due to an overly large edge region 122, and thus preventing the problem of lithium deposition, which helps to improve the service life and safety of the battery.
[0078] See Figure 3 As shown, the distance from the highest point of the first main region 131 to the edge region 122 of the active layer 120 can be w4 + w3, the width of the edge region 122 can be w2, and the ratio between w4 + w3 and w2 can be 1 to 3. That is, the ratio of the distance from the dispensing position of the insulating layer 130 to the edge region 122 to the width of the edge region 122 is 1 to 3. By controlling the dispensing position of the insulating layer 130, the width of the miscible region 140 can be controlled to be smaller, which helps to improve the overall flatness and energy density of the battery cell.
[0079] Continue to refer to Figure 3 As shown, the thickness of the miscible region 140 can be d3, the thickness of the second main region 121 of the active layer 120 can be d1, and the ratio between d3 and d1 can be 0.95 to 1.03. This can reduce the thickness difference between the miscible region 140 and the second main region 121, making the overall thickness of the electrode plate 100 more uniform, which helps to further improve the bonding effect at the edge of the battery cell and enhance the overall structural stability of the battery cell.
[0080] Moreover, the thickness of the miscible region 140 is relatively close to the thickness of the second main region 121 of the active layer 120. During the hot pressing and forming process, the overall pressing of the battery cell can be made more uniform, effectively reducing and avoiding the phenomenon of edge bulging of the battery, thereby effectively improving the cycle performance of the battery cell.
[0081] Continue to refer to Figure 2 As shown, the width of the miscible region 140 can be w3, the thickness of the highest point of the insulating layer 130 can be d4, and the ratio between w3 and d4 can be 2 to 10. This can effectively reduce the width of the miscible region 140 and improve the flatness of the battery cell.
[0082] The embodiments of the present application can also provide a battery cell, which can include a first electrode plate, a second electrode plate, and a separator. The first electrode plate can be the electrode plate 100 in any of the above scenarios. For example, the electrode plate 100 can be a positive electrode plate, and the second electrode plate can be a negative electrode plate. By making the battery cell include the above-mentioned electrode plate, the concave parts in the battery cell can be effectively reduced, the overall thickness uniformity of the battery cell can be effectively improved, the overall adhesiveness of the battery cell can be enhanced, and thus the structural stability of the battery cell can be effectively improved.
[0083] Among them, the negative electrode tab can include a negative electrode current collector and a negative electrode active layer located on the negative electrode current collector. Along the first direction of the battery cell, the edge of the miscibility region 140 of the first tab (i.e., tab 100) does not exceed the edge of the second tab (i.e., the negative electrode tab). Herein, the first direction can be the length direction of the battery cell, and it can be understood that the first direction is from the active layer 120 to the insulating layer 130.
[0084] In other words, it can be understood that the boundary between the insulating layer 130 and the miscibility region 140 does not exceed the boundary of the negative electrode active layer.
[0085] This can increase the coverage area of the negative electrode tab and the positive electrode tab (i.e., tab 100), effectively reducing or avoiding the occurrence of lithium plating due to the overly small coverage area of the negative electrode tab on the positive electrode tab, which helps to improve the service life and safety of the battery.
[0086] Among them, the highest point of the insulating layer 130 can be located outside the negative electrode tab. In this way, on the premise that the negative electrode tab exceeds the positive electrode tab, the edge of the negative electrode tab can be relatively close to the edge of the positive electrode tab, effectively reducing the size difference between the negative electrode tab and the positive electrode tab, which helps to improve the overall energy density of the battery cell.
[0087] The embodiment of the present application can also provide a battery, which can include the above-mentioned battery cell. By making the battery include the above-mentioned battery cell, the battery cell has better flatness and structural stability, which can effectively improve the overall flatness and structural stability of the battery, and helps to extend the service life of the battery.
[0088] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0089] In the description of the present invention, it should be understood that the terms "include" and "have" used herein and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.
[0090] Unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a direct connection or an indirect connection through an intermediate medium, and can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.
[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.
Claims
1. A pole piece, characterized in that: It includes a current collector and an active layer and an insulating layer located on the current collector; The insulating layer includes a first main region and a first side region close to the active layer; The thickness of the first side region of the insulating layer is smaller than the thickness of the main region of the insulating layer; The current collector includes a connected pole piece region and a pole lug region, the active layer is located in the pole piece region, and the first main body region of the insulating layer is located in the pole lug region.
2. The pole piece according to claim 1, characterized in that: A ratio of a thickness of the first side region of the insulating layer to a thickness of the first main region of the insulating layer is 0.95-1.
3. The pole piece according to claim 1 or 2, characterized in that: The insulating layer further includes a second side region, the second side region is located at a side of the first main region away from the active layer, and a thickness of the second side region is smaller than a thickness of the first main region.
4. The pole piece according to claim 3, characterized in that: The thickness of the insulating layer gradually decreases from the highest point of the first main region toward the active layer; and / or The thickness of the insulating layer gradually decreases from the highest point of the first main region toward a direction away from the active layer.
5. The pole piece according to claim 1 or 2, characterized in that: The active layer comprises a second main body region and an edge region connected to each other, wherein the edge region is located between the second main body region and the insulating layer; The ratio of the thickness of the second main body region to the average thickness of the edge region is 0.95-1.
05.
6. The pole piece according to claim 5, characterized in that: The ratio of the height of the highest point of the first main body region to the thickness of the highest point of the second main body region of the active layer is 1:1-1:
4.
7. The pole piece according to claim 5, characterized in that: The thickness of the edge region gradually decreases from one end of the edge region close to the second main region to the other end of the edge region far from the second main region, and the ratio of the maximum thickness of the edge region to the thickness of the second main region is 0.98-1.
03.
8. The pole piece according to claim 5, characterized in that: Also included is a miscible region, the miscible region being located between the edge region and the first side region of the insulating layer; The ratio of the width of the edge zone to the thickness of the miscible zone is 1-5.
9. The pole piece according to claim 5, characterized in that: The ratio of the distance from the highest point of the first main region to the edge region to the width of the edge region is 1-3.
10. The pole piece according to claim 8, characterized in that: The ratio of the thickness of the miscible region to the thickness of the second main region is 0.95 to 1.
03.
11. The pole piece according to claim 8 or 10, characterized in that: The ratio of the width of the miscible zone to the thickness of the highest point of the first main body zone is 2-10.
12. A battery cell, characterized in that: The battery cell comprises a first pole piece, a second pole piece and a diaphragm, and the first pole piece is the pole piece according to any one of claims 1 to 11.
13. The battery cell according to claim 12, characterized in that: Along the first direction of the battery cell, the edge of the miscible region of the first pole piece does not exceed the edge of the second pole piece; And / or, the highest point of the insulating layer of the first pole piece is located outside the second pole piece.
14. A battery, characterized in that: A battery cell comprising any one of claims 12 to 13.