Electrochemical device, electric equipment and method for manufacturing electrochemical device

Abstract

The embodiment of the invention relates to an electrochemical device, electric equipment and a method for manufacturing the electrochemical device, the electrochemical device comprises a first pole piece, a second pole piece, a diaphragm and a first insulating part, and the first pole piece, the diaphragm and the second pole piece are sequentially superposed along a first direction; the first pole piece comprises a first main body part, a first head part and a first tab, one end of the first head part is connected to the first main body part along a second direction, the first tab is arranged on one side of the first head part along a third direction, and a first insulating part and a second insulating part of the first insulating part are arranged on a first surface of the first tab; the first insulating part of the first insulating part is arranged at one end, close to the first main body part, of the first surface in the second direction, and the second insulating part of the first insulating part is arranged at one end, close to the first head part, of the first surface in the third direction. In this way, the risk that the electrochemical device is short-circuited when being impacted can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a method for manufacturing a battery cell, and an electrochemical device. Background Technology

[0002] With the rapid development of electronic information technology, electronic devices are becoming increasingly intelligent, with more and more functions, and are increasingly popular with users. The application scenarios for electronic devices are also increasing.

[0003] In actual use, electronic devices inevitably encounter scenarios such as drops and impacts, which can also cause the battery cells inside the electronic devices to fall or be impacted. How to reduce the risk of short circuits in battery cells under such scenarios has become an important research topic. Summary of the Invention

[0004] The main technical problem solved by the embodiments of this application is to provide an electrochemical device, an electrical device, and a method for manufacturing an electrochemical device, which can reduce the risk of short circuit when the electrochemical device is subjected to impact.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application embodiment is: providing an electrochemical device, including a first electrode, a diaphragm, a second electrode, and a first insulating member; the first electrode and the second electrode are alternately stacked along a first direction, a diaphragm is disposed between adjacent first and second electrodes, the first electrode includes a first main body and a first head, one end of the first head is connected to the first main body along a second direction, a first tab is disposed on one side of the first head along a third direction, and the second electrode is disposed with a second tab; the first insulating member includes a first insulating part and a second insulating part connected to each other, both the first insulating part and the second insulating part are disposed on the first surface of the first tab; the first insulating part of the first insulating member is disposed on the side of the first surface along the second direction close to the first main body, and the second insulating part of the first insulating member is disposed on the side of the first surface along the third direction close to the first head, the first direction, the second direction, and the third direction are perpendicular to each other.

[0006] In this embodiment, by providing a first insulating part and a second insulating part, on the one hand, the first electrode tab can provide a buffering effect when it is impacted, which helps to reduce the bending deformation or displacement of the first electrode tab and reduce the risk of the first electrode tab contacting the adjacent second electrode piece, thereby reducing the risk of short circuit; on the other hand, by providing the first insulating part, even if the first electrode tab is impacted and bent or displaced, the first insulating part can also prevent the first electrode tab from forming an electrical connection with the adjacent second electrode piece, further reducing the risk of short circuit.

[0007] In some embodiments, the first electrode tab is connected to the first head via a second insulating portion.

[0008] In some embodiments, there are multiple first electrodes, diaphragms, second electrodes, and first insulating members. Multiple first electrodes and multiple second electrodes are alternately stacked along a first direction. A diaphragm is disposed between adjacent first and second electrodes, and a first insulating member is disposed on the first surface of a first electrode tab. A first insulating portion of the first insulating member is disposed on the side of the first surface near the first main body along a second direction, and a second insulating portion of the first insulating member is disposed on the side of the first surface near the first head along a third direction. By providing multiple first electrodes and multiple second electrodes, the capacity of the electrochemical device can be increased.

[0009] In some embodiments, along a third direction, the width of the first head is smaller than the width of the first body portion, the first head and the first body portion together form a first notch, and one end of a first electrode tab is connected to the sidewall of the first head at the first notch; along a second direction, there is a first gap between the first electrode tab and the first body portion, and a first insulating portion is at least partially disposed in the first gap.

[0010] In this embodiment, by forming a first gap between the first electrode tab and the first main body, it is convenient to weld the ends of each first electrode tab away from the first head to each other, reducing the welding difficulty between each first electrode tab, reducing the risk of tearing at the edges when each first electrode tab is gathered together, and helping to improve production efficiency.

[0011] In some embodiments, along a third direction, one end of the first insulating portion is aligned with one end of the first electrode tab, and the other end of the first insulating portion extends along a third direction; along a third direction, at least a portion of the first insulating portion protrudes from the second electrode adjacent to the first insulating portion.

[0012] In this embodiment, by making at least a portion of the first insulating portion protrude beyond the second electrode adjacent to the first insulating portion, the first insulating portion can block the contact between the first electrode tab and the second electrode, thereby reducing the risk of short circuit.

[0013] In some embodiments, the first insulating member includes a third insulating portion disposed on the second surface of the first body portion, and along the second direction, the third insulating portion is located on the side of the second surface near the first gap, and the third insulating portion is connected to the second insulating portion.

[0014] In this embodiment, by providing a third insulating part and connecting the third insulating part with the second insulating part, the buffering effect of the first insulating member on the first electrode tab when it is impacted can be enhanced, and the third insulating part can also enhance the insulation effect between the first main body and the second electrode, reducing the risk of short circuit between the first main body and the second electrode.

[0015] In some embodiments, along a third direction, one end of the third insulating portion is connected to the second insulating portion, and the other end of the third insulating portion protrudes from the second electrode adjacent to the third insulating portion. This configuration improves the insulation performance between the first body portion and the adjacent second electrode, reducing the risk of a short circuit between the first body portion and the second electrode.

[0016] In some embodiments, the first insulating portion and the second insulating portion are integrally formed; and / or, the second insulating portion and the third insulating portion are integrally formed. Integral forming can improve the strength of the first insulating member, thereby enhancing its ability to buffer the first electrode tab when impacted, and reducing the risk of short circuits in the electrochemical device.

[0017] In some embodiments, the third insulating portion and the second insulating portion are disposed separately along the second direction. This reduces the risk of tearing caused by the edges of multiple first tabs being pulled apart by the third and second insulating portions when they are retracted. Separation means that the third and second insulating portions may have a gap or simply a cutting line, allowing them to separate in the second direction, while their ends in the third direction can be connected by the first insulating portion.

[0018] In some embodiments, the second electrode is provided with a first clearance opening; when viewed along a first direction, the first clearance opening and the first notch at least partially overlap, and along the first direction, the projection of the second electrode onto the wall of the first clearance opening is located within the first insulating member.

[0019] In this embodiment, by providing a first clearance opening to avoid the first electrode tab, the risk of the first electrode tab contacting the second electrode plate can be reduced, thereby reducing the risk of short circuit, and facilitating the welding and fixing of the first electrode tabs of the first electrode plate to each other.

[0020] In some embodiments, along a third direction, the first electrode tab protrudes at least partially from the first body portion, thereby providing more operating space for welding connections between the first electrode tabs, which helps to reduce the difficulty of welding operations and improve production efficiency.

[0021] In some embodiments, the first electrode includes a first current collector and a first active material layer. The first current collector includes a first current collector body and a first current collector head. The first active material layer includes a first active material layer body and a first active material layer head. The first active material layer body is disposed on the first current collector body, and the first active material layer head is disposed on the first current collector head. The first current collector body and the first active material layer body together constitute a first main body, and the first current collector head and the first active material layer head together constitute a first head. The first electrode tab is obtained by extending from the first current collector head in a third direction.

[0022] In some embodiments, the second electrode includes a second body portion and a second head portion, one end of the second head portion is connected to the second body portion along a second direction, one end of the second electrode tab is connected to the second head portion, and the other end of the second electrode tab portion extends along a third direction; the projection of the second electrode tab portion along the second direction at least partially overlaps with the second body portion; the electrochemical device further includes a second insulating member, the second insulating member including a fourth insulating portion and a fifth insulating portion connected to each other, the fourth insulating portion and the fifth insulating portion being disposed on the third surface of the second electrode tab portion; the fourth insulating portion of the second insulating member is disposed on the side of the third surface of the second surface of the second body portion along the second direction, and the fifth insulating portion of the second insulating member is disposed on the side of the third surface of the third surface of the second head portion along the third direction.

[0023] In this embodiment, by providing the fourth and fifth insulating parts, on the one hand, the second electrode tab can provide a buffering effect when it is impacted, which helps to reduce the bending deformation or displacement of the second electrode tab and reduce the risk of the second electrode tab contacting the adjacent first electrode piece, thereby reducing the risk of short circuit; on the other hand, by providing the second insulating member, even if the second electrode tab is bent or displaced by impact, the second insulating member can also prevent the second electrode tab from forming an electrical connection with the adjacent first electrode piece, further reducing the risk of short circuit.

[0024] In some embodiments, when there are multiple first electrodes, diaphragms, and second electrodes, there are also multiple second insulating members, with one second insulating member disposed on the third surface of a second electrode tab. A fourth insulating portion of the second insulating member is disposed on the side of the third surface along a second direction near the second main body, and a fifth insulating portion of the second insulating member is disposed on the side of the third surface along a third direction near the second head. By providing multiple second insulating members, and with one second insulating member disposed on the third surface of a second electrode tab, the risk of the second electrode tab forming an electrical connection with an adjacent first electrode can be prevented, thereby reducing the risk of a short circuit.

[0025] In some embodiments, along a third direction, the width of the second head is less than the width of the second body portion, the second head and the second body portion are jointly constructed with a second notch, and one end of a second electrode is connected to the sidewall of the second head at the second notch; along a second direction, there is a second gap between the second electrode and the second body portion.

[0026] In this embodiment, by forming a second gap between the second electrode tab and the second main body, it is convenient to weld the ends of each second electrode tab away from the second head to each other, which can reduce the welding difficulty between each second electrode tab and reduce the risk of tearing at the edges when each first electrode tab is gathered together, thus improving production efficiency.

[0027] In some embodiments, the second insulating member includes a sixth insulating portion disposed on the fourth surface of the second body portion, and along the second direction, the sixth insulating portion is located at one end of the fourth surface near the second gap, and the sixth insulating portion is connected to the fifth insulating portion.

[0028] In this embodiment, by providing a sixth insulating part and connecting the sixth insulating part with the fifth insulating part, the buffering effect of the second insulating member on the second electrode tab when it is impacted can be enhanced. Furthermore, the sixth insulating part can also enhance the insulation effect between the second main body and the first electrode, reducing the risk of short circuit between the second main body and the first electrode.

[0029] In some embodiments, the first electrode sheet is further provided with a second clearance opening; viewed along a first direction, the second clearance opening and the second notch at least partially overlap, and along the first direction, the projection of the first electrode sheet onto the wall of the second clearance opening is located within the second insulating member. In this embodiment, the second clearance opening is used to avoid the second electrode tab, which can reduce the risk of the second electrode tab contacting the first electrode sheet, thereby reducing the risk of short circuit, and facilitates the welding and fixing of the second electrode tabs of multiple second electrode sheets together.

[0030] The beneficial effects of this application embodiment are as follows: Unlike the prior art, in this application embodiment, by providing a first insulating part and a second insulating part, on the one hand, when the first electrode is impacted, it can provide a buffering effect, which helps to reduce the bending deformation or displacement of the first electrode, reduce the risk of the first electrode contacting the adjacent second electrode, and thus reduce the risk of short circuit; on the other hand, by providing a first insulating member, even if the first electrode is impacted and bent or displaced, the first insulating member can also prevent the first electrode from forming an electrical connection with the adjacent second electrode, further reducing the risk of short circuit.

[0031] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide an electrical device, including the above-mentioned electrochemical device.

[0032] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is: providing a method for manufacturing an electrochemical device, comprising: A first electrode, a diaphragm, a second electrode, and a first insulating member are provided. The first electrode includes a first body portion and a first head portion. One end of the first head portion is connected to the first body portion along a second direction. A first electrode tab is disposed on one side of the first head portion along a third direction. The first insulating member includes a first insulating portion and a second insulating portion connected to each other. The first insulating member is disposed on a first surface of the first electrode tab portion. The first insulating portion of the first insulating member is disposed on one end of the first surface along the second direction near the first body portion, and the second insulating portion is disposed on one end of the first surface along the third direction near the first head portion. The first direction, the second direction, and the third direction are perpendicular to each other. The first electrode and the second electrode are alternately stacked along a first direction, wherein a diaphragm is disposed between adjacent first and second electrodes.

[0033] In this embodiment, both the first insulating portion and the second insulating portion are disposed on the first surface of the first electrode tab. Along the second direction, the first insulating portion is located on the side of the first surface closer to the first main body, and the second insulating portion is located on the side of the first surface along the third direction closer to the first head. The first insulating portion and the second insulating portion are connected. On the one hand, when the first electrode tab is impacted, the first insulating portion and the second insulating portion can provide a buffering effect, which helps to reduce the bending deformation or displacement of the first electrode tab and reduce the risk of the first electrode tab contacting the adjacent second electrode piece, thereby reducing the risk of short circuit. On the other hand, even if the first electrode tab is impacted and bent or displaced, the first insulating portion and the second insulating portion can also prevent the first electrode tab from forming an electrical connection with the adjacent second electrode piece, further reducing the risk of short circuit.

[0034] In some embodiments, the step of providing the first electrode and the first insulating member further includes: Provide the first fluid-collecting fabric and the first active material; The first active material is coated onto the first current collector fabric to form the first electrode panel; A portion of the first active material on the first electrode panel is peeled off to form a plurality of first grooves on the first electrode panel. The plurality of first grooves are arranged in an array, and the first electrode panel has two first walls and one second wall in each of the first grooves. The two ends of the second wall are respectively connected to the two first walls. A plurality of first insulating materials are provided, and one of the first insulating materials is disposed in a first groove, the first insulating material covering all of the second wall and at least a portion of the two first walls; The first insulating material and the first electrode panel are cut to obtain multiple first electrode plates and multiple first insulating components.

[0035] In this embodiment, by first coating the first active material onto the first current collector fabric and then peeling off a portion of the first active material, a plurality of first grooves are formed on the first electrode panel, which is simple to operate. In addition, by cutting the first insulating material and the first electrode panel, a plurality of first electrodes and a plurality of first insulating components are obtained, which is more efficient than processing the first electrodes and first insulating components one by one, thereby saving costs.

[0036] In some embodiments, the step of cutting the first insulating material and the first electrode panel to obtain a plurality of first electrodes and a plurality of first insulating elements further includes: The first electrode panel is cut along the first tangent H to divide the first electrode panel into multiple first electrode strips. The first tangent H passes through the second wall, cuts the first groove to form two first half-grooves, and cuts the first insulating material to form two L-shaped first insulating sheets. One first insulating sheet is located in one first half-groove, and the two first half-grooves in the first groove are respectively located in two adjacent first electrode strips. For each first electrode strip, cut along the edge of the first half groove on the first electrode strip that is not covered by the first insulating sheet, and then cut each first electrode strip along the second tangent line F to obtain multiple first die-cut electrode sheets, wherein the second tangent line F is aligned with the junction of the first wall of the first half groove where the first insulating sheet is provided and where the first insulating sheet is not provided. Along the direction parallel to the second wall of the first half-groove, the portion of the first current collector fabric located in the first half-groove is cut to obtain multiple first electrode sheets. The portion of the first current collector fabric located in the first half-groove constitutes the first electrode tab. The cutting also divides the first insulating sheet located on the second wall of the first half-groove into a first insulating part and a third insulating part. The first insulating part is located on the first electrode tab, and the third insulating part is located in the first half-groove. The portion of the first insulating sheet that abuts against the second wall constitutes the third insulating part.

[0037] In this embodiment, by cutting the portion of the first current collector fabric located in the first half-groove, a plurality of first electrode plates are obtained, and the portion of the first current collector fabric located in the first half-groove constitutes a first electrode tab. This allows the first electrode tab to form the aforementioned first gap with the first main body, which facilitates welding the ends of each first electrode tab away from the first head to each other, reduces the welding difficulty between each first electrode tab, and helps to improve production efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0039] Figure 1 This is a schematic diagram of the electrochemical device provided in the embodiments of this application; Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of AA in the middle section; Figure 3 yes Figure 2 An enlarged view of the area shown in section A; Figure 4 This is a schematic diagram of the structure of the first electrode and the first insulating element provided in the embodiments of this application; Figure 5This is an exploded structural diagram of the first electrode and the first insulating element provided in the embodiments of this application; Figure 6 This is an exploded structural diagram of the first electrode, the first insulating element, the diaphragm, and the second electrode provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the second electrode and the second insulating element provided in the embodiments of this application; Figure 8 This is an exploded structural diagram of the first electrode, the first insulating element, the diaphragm, and the second electrode provided in the embodiments of this application; Figure 9 This is a flowchart of the manufacturing of the electrochemical device provided in the embodiments of this application; Figure 10 yes Figure 9 Detailed flowchart of step 01; Figure 11 yes Figure 10 Detailed flowchart of step 015; Figure 12 This is a schematic diagram of the structure of the first electrode panel provided in this application embodiment when the first groove is not formed; Figure 13 This is a schematic diagram of the structure of the first electrode panel after the first groove is formed in the embodiment of this application; Figure 14 This is a schematic diagram of the structure of the first electrode panel after the first insulating material is formed in the embodiment of this application; Figure 15 yes Figure 14 An enlarged view of the area shown in section B; Figure 16 This is a schematic diagram of the structure of the first electrode strip provided in the embodiments of this application; Figure 17 yes Figure 16 A schematic diagram of the cutting position in the diagram; Figure 18 This is a schematic diagram of the structure of the first die-cut electrode sheet provided in the embodiments of this application; Figure 19 This is a schematic diagram of the structure of the first electrode provided in the embodiments of this application.

[0040] Attached icon number Detailed Implementation

[0041] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0043] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0044] Please see Figure 1 , Figure 2 and Figure 3 The electrochemical device 1 includes a first electrode 11, a diaphragm 12, and a second electrode 13. The first electrode 11 and the second electrode 13 are stacked along a first direction X. The diaphragm 12 is disposed between the first electrode 11 and the second electrode 13. The diaphragm 12 is used to insulate and isolate the first electrode 11 and the second electrode 13 to reduce the risk of short circuit.

[0045] In some embodiments, please refer to Figure 4The first electrode 11 includes a first main body 111, a first head 112, and a first tab 113. One end of the first head 112 is connected to the first main body 111 along a second direction Y, which is perpendicular to the first direction X. One end of the first tab 113 is connected to the first head 112, and the other end of the first tab 113 extends along a third direction Z. That is, the first tab 113 is formed by extending the first head 112 along the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. Along the second direction Y, the projection of the first tab 113 at least partially overlaps with the first main body 111. The first tab 113 is used to realize the electrical connection between the first electrode 11 and other components. Figure 6 The second electrode 13 extends with a second electrode tab 133, which is used to realize the electrical connection between the second electrode 13 and other components.

[0046] It is worth noting that in related technologies, when the electrochemical device 1 is subjected to an impact, the tab is more prone to displacement than other parts, making it easy for the tab to insert into an adjacent electrode, thereby causing a short circuit. To solve the above problem, in some embodiments, please refer to... Figure 3 , Figure 4 and Figure 5 The electrochemical device 1 further includes a first insulating member 14, which includes a first insulating portion 141 and a second insulating portion 142 connected to each other. A first electrode tab 113 has a first surface 1131, and both the first insulating portion 141 and the second insulating portion 142 are disposed on the first surface 1131. The first insulating portion 141 of the first insulating member 14 is disposed on the side of the first surface 1131 along the second direction Y near the first body portion 111, and the second insulating portion 142 of the first insulating member 14 is disposed on the side of the first surface 1131 along the third direction Z near the first head 112. In this embodiment, by providing the first insulating part 141 and the second insulating part 142, on the one hand, the first electrode tab 113 can provide a buffering effect when it is impacted, which helps to reduce the bending deformation or displacement of the first electrode tab 113, reduce the risk of the first electrode tab 113 contacting the adjacent second electrode piece 13, and thus reduce the risk of short circuit; on the other hand, by providing the first insulating member 14, even if the first electrode tab 113 is bent or displaced by impact, the first insulating member 14 can also prevent the first electrode tab 113 from forming an electrical connection with the adjacent second electrode piece 13, further reducing the risk of short circuit.

[0047] In this application, the fact that component A is disposed on one side of the surface of component B along direction C means that component A covers the edge of component B, and the position of component A is between one side of the surface of component B along direction C and the center of the component.

[0048] It is worth noting that in this application, the number of the first electrode 11, diaphragm 12, second electrode 13, and first insulating member 14 can be one, such as... Figure 6 and Figure 8 As shown; in addition, the number of the first electrode 11, diaphragm 12, second electrode 13, and first insulating member 14 can also be multiple, such as Figures 1 to 3 As shown, at this time, multiple first electrode plates 11 and multiple second electrode plates 13 are alternately stacked along the first direction X, and a diaphragm 12 is disposed between adjacent first electrode plates 11 and second electrode plates 12. The diaphragm 12 is used to insulate and isolate adjacent first electrode plates 11 and second electrode plates 13. A first insulating member 14 is disposed on the first surface 1131 of a first electrode tab 113. Specifically, please refer to... Figure 4 A first insulating portion 141 of a first insulating member 14 is disposed on a first surface 1131 along the second direction Y near the first main body 111, and a second insulating portion 142 of a first insulating member 14 is disposed on a first surface 1131 along the third direction Z near the first head 112. By providing multiple first electrodes 11, diaphragms 12, second electrodes 13, and first insulating members 14, the capacity of the electrochemical device 100 can be increased. In addition, when the first electrode tab 113 is impacted and bent or displaced, the first insulating member 14 can prevent the first electrode tab 113 from forming an electrical connection with the adjacent second electrode tab 13, thereby reducing the risk of short circuit.

[0049] In some embodiments, please refer to Figure 4 Along the third direction Z, the width of the first head 112 is smaller than the width of the first body 111, and the first head 112 and the first body 111 together form a first notch 114. One end of a first tab 113 is connected to the sidewall of the first head 112 at the first notch 114, and the other end of the first tab 113 extends along the third direction Z. Along the second direction Y, there is a first gap 115 between the first tab 113 and the first body 111. In the production process of the electrochemical device 1, it is necessary to weld the first tabs 113 of each first electrode 11 together to form an electrical connection. In this embodiment, by forming a first gap 115 between the first tab 113 and the first body 111, it is convenient to weld the ends of each first tab 113 away from the first head 112 together, reducing the welding difficulty between the first tabs 113 and improving production efficiency.

[0050] In some embodiments, please refer to Figure 4 Along the third direction Z, at least a portion of the first tab 113 protrudes from the first main body 111, thereby providing more operating space for welding connections between the first tabs 113, which helps to reduce the difficulty of welding operations and improve production efficiency.

[0051] In some embodiments, please refer to Figure 6 Along the third direction Z, one end of the first insulating portion 141 is aligned with the end of the first tab 113 near the first head 112, and the other end of the first insulating portion 141 extends along the third direction Z. At least a portion of the first insulating portion 141 protrudes beyond the second electrode 13 adjacent to it. If the length of the first insulating portion 141 is too short along the third direction Z, it will be difficult for the first insulating portion 141 to prevent contact between the first tab 113 and the second electrode 13. Therefore, in this embodiment, by making at least a portion of the first insulating portion 141 protrude beyond the second electrode 13 adjacent to it, the first insulating portion 141 can prevent contact between the first tab 113 and the second electrode 13, reducing the risk of short circuit.

[0052] In some embodiments, please refer to Figure 5 and Figure 6 The first insulating member 14 includes a third insulating portion 143. The first main body 111 has a second surface 1111, and the third insulating portion 143 is disposed on the second surface 1111 along the second direction Y. The third insulating portion 143 is located on the side of the second surface 1111 near the first gap 115, and one end of the third insulating portion 143 is connected to the second insulating portion 142. In this embodiment, by providing the third insulating portion 143 and connecting the third insulating portion 143 to the second insulating portion 142, the buffering effect of the first insulating member 14 on the first electrode tab 113 when it is impacted can be enhanced. Furthermore, the third insulating portion 143 can also enhance the insulation effect between the first main body 111 and the second electrode 13, reducing the risk of short circuit between the first main body 111 and the second electrode 13.

[0053] In some embodiments, please refer to Figure 4 and Figure 6 Along the third direction Z, one end of the third insulating part 143 is connected to the second insulating part 142, and the other end of the third insulating part 143 protrudes from the second electrode 13 adjacent to the third insulating part 143. With this configuration, the third insulating part 143 can improve the insulation performance between the first main body 111 and the adjacent second electrode 13, and reduce the risk of short circuit between the first main body 111 and the second electrode 13.

[0054] In some embodiments, please refer to Figure 6 Each second electrode 13 is provided with a first clearance opening 138. When viewed along the first direction X, the first clearance opening 138 and the first notch 114 overlap at least partially. The first clearance opening 138 is used to avoid the first electrode tab 113, so as to reduce the risk of the first electrode tab 113 contacting the second electrode 13, thereby reducing the risk of short circuit, and facilitating the welding and fixing of the first electrode tabs 113 of the first electrode 11 to each other.

[0055] In some embodiments, along the first direction X, the projection of the second electrode 13 onto the wall of the first clearance opening 138 is located within the first insulating member 14. With this configuration, when the first electrode tab 113 is impacted and bent or displaced, the first insulating member 14 can prevent the first electrode tab 113 from contacting the second electrode 13, thereby reducing the risk of short circuit in the electrochemical device 1.

[0056] In some embodiments, along the first direction X, the projection of the first tab 113 of the first electrode 11 is completely contained within the projection of the first clearance opening 138, thereby reducing the risk of short circuit between the first tab 113 and the second electrode 13.

[0057] In some embodiments, the first insulating portion 141 and the second insulating portion 142 are integrally formed, thereby increasing the strength of the first insulating member 14 and thus improving the buffering capacity of the first insulating member 14 for the first tab 113 when it is impacted, reducing the risk of short circuit in the electrochemical device 1.

[0058] In some embodiments, the second insulating portion 142 and the third insulating portion 143 are integrally formed, thereby increasing the strength of the first insulating member 14 and thus improving the buffering capacity of the first insulating member 14 for the first tab 113 when it is impacted, reducing the risk of short circuit in the electrochemical device 1.

[0059] In some embodiments, the third insulating portion 143 and the second insulating portion 142 are separately disposed along the second direction Y. This reduces the risk of tearing caused by the third insulating portion 143 and the second insulating portion 142 pulling the edges of the first tab when it is closed. Separation means that the third insulating portion 143 and the second insulating portion 142 may have a gap or simply a cutting line, allowing them to separate in the second direction Y, while their ends in the third direction Z can be connected by the first insulating portion 141.

[0060] In some embodiments, please refer to Figure 5The first electrode 11 includes a first current collector 116 and a first active material layer 117. The first current collector 116 includes a first current collector body 1161 and a first current collector head 1162. The first active material layer 117 includes a first active material layer body 1171 and a first active material layer head 1172. The first active material layer body 1171 is disposed on the first current collector body 1161, and the first active material layer head 1172 is disposed on the first current collector head 1162. The first current collector body 1161 and the first active material layer body 1171 together constitute the aforementioned first main body 111, and the first current collector head 1162 and the first active material layer head 1172 together constitute the aforementioned first head 112. The first electrode tab 113 extends from the first current collector head 1162 in a third direction Z. The second surface 1111 of the aforementioned first main body 111 is disposed on the first current collector body 1161, and the aforementioned first active material layer body 1171 is disposed on the second surface 1111.

[0061] In some embodiments, please refer to Figure 7 The second electrode 13 includes a second main body 131 and a second head 132. One end of the second head 132 is connected to the second main body 131 along a second direction Y. One end of the aforementioned second tab 133 is connected to the second head 132, and the other end of the second tab 133 extends along a third direction Z. That is, the second tab 133 is obtained by extending the second head 132 along a third direction Z. Along the second direction Y, the projection of the second tab 133 at least partially overlaps with the second main body 131. The second tab 133 is used to realize the electrical connection between the second electrode 13 and other components. The fact that the projection of the second tab 133 at least partially overlaps with the second main body 131 can prevent the second tab 133 from extending beyond the second head 132 and occupying the head space of the electrochemical device 1.

[0062] In some embodiments, please refer to Figure 7 and Figure 8The electrochemical device 1 further includes a second insulating member 15, which includes a fourth insulating portion 151 and a fifth insulating portion 152 connected to each other. The second electrode tab 133 has a third surface 1331, and both the fourth insulating portion 151 and the fifth insulating portion 152 are disposed on the third surface 1331. The fourth insulating portion 151 of the second insulating member 15 is disposed on the side of the third surface 1331 of the second electrode tab 133 along the second direction Y, close to the second body portion 131, and the fifth insulating portion 152 of the second insulating member 15 is disposed on the side of the third surface 1331 of the second electrode tab 133 along the third direction Z, close to the second head 132. In this embodiment, by providing the fourth insulating part 151 and the fifth insulating part 152, on the one hand, the second electrode 133 can provide a buffering effect when it is impacted, which helps to reduce the bending deformation or displacement of the second electrode 133 and reduce the risk of the second electrode 133 contacting the adjacent first electrode 11, thereby reducing the risk of short circuit; on the other hand, by providing the second insulating member 15, even if the second electrode 133 is impacted and bent or displaced, the second insulating member 15 can also prevent the second electrode 133 from forming an electrical connection with the adjacent first electrode 11, further reducing the risk of short circuit.

[0063] It is worth noting that when there is only one first electrode 11, diaphragm 12, and second electrode 13, there is also only one second insulating member 15; and when there are multiple first electrode 11, diaphragm 12, and second electrode 13, there are also multiple second insulating members 15. In this case, a second insulating member 15 is disposed on the third surface 1331 of a second electrode tab 133. Specifically, a fourth insulating portion 151 of a second insulating member 15 is disposed on the side of the third surface 1331 of a second electrode tab 133 along the second direction Y close to the second main body portion 131, and a fifth insulating portion 152 of a second insulating member 15 is disposed on the side of the third surface 1331 of a second electrode tab 133 along the third direction Z close to the second head 132. By providing a second insulating member 15 on the third surface 1331 of a second electrode 133, when the second electrode 133 is impacted and bent or displaced, the second insulating member 15 can prevent the second electrode 133 from forming an electrical connection with the adjacent first electrode 11, thereby reducing the risk of short circuit.

[0064] In some embodiments, please refer to Figure 7Along the third direction Z, the width of the second head 132 is smaller than the width of the second body portion 131, and the second head 132 and the second body portion 131 together form a second notch 134. Along the third direction Z, the second notch 134 and the aforementioned first clearance opening 138 are located on opposite sides of the second head 132. One end of a second electrode tab 133 is connected to the sidewall of the second head 132 at the second notch 134, and the other end of the second electrode tab 133 extends along the third direction Z. Along the second direction Y, there is a first and second gap 135 between the second electrode tab 133 and the second body portion 131. In the production process of the electrochemical device 1, it is necessary to weld the second electrode tabs 133 of each second electrode 13 together to form an electrical connection. In this embodiment, by forming a second gap 135 between the second electrode tab 133 and the second body portion 131, it is convenient to weld the ends of each second electrode tab 133 away from the second head 132 together, which can reduce the welding difficulty between the second electrode tabs 133 and improve production efficiency.

[0065] In some embodiments, please refer to Figure 7 Along the third direction Z, at least a portion of the second tab 133 protrudes from the second main body 131, thereby providing more operating space for welding connections between the second tabs 133, which helps to reduce the difficulty of welding operations and improve production efficiency.

[0066] In some embodiments, please refer to Figure 7 and Figure 8 One end of the fourth insulating portion 151 is aligned with the end of the second tab 133 near the second head 132, and the other end of the fourth insulating portion 151 extends along the third direction Z. Along the third direction Z, at least a portion of the fourth insulating portion 151 protrudes beyond the first electrode 11 adjacent to it. If the length of the fourth insulating portion 151 is too short along the third direction Z, it will be difficult for it to prevent contact between the second tab 133 and the first electrode 11. Therefore, in this embodiment, by making at least a portion of the fourth insulating portion 151 protrude beyond the first electrode 11 adjacent to it, the fourth insulating portion 151 can prevent contact between the second tab 133 and the first electrode 11, reducing the risk of short circuit.

[0067] In some embodiments, please refer to Figure 7 and Figure 8The second insulating member 15 includes a sixth insulating portion 153. The second main body 131 has a fourth surface 1311, and the sixth insulating portion 153 is disposed on the fourth surface 1311. Along the second direction Y, the sixth insulating portion 153 is located on the side of the fourth surface 1311 near the second gap 135, and one end of the sixth insulating portion 153 is connected to the fifth insulating portion 152. In this embodiment, by providing the sixth insulating portion 153 and connecting the sixth insulating portion 153 to the fifth insulating portion 152, the buffering effect of the second insulating member 15 on the second electrode tab 133 when it is impacted can be enhanced. Furthermore, the sixth insulating portion 153 can also enhance the insulation effect between the second main body 131 and the first electrode 11, reducing the risk of short circuit between the second main body 131 and the first electrode 11.

[0068] In some embodiments, please refer to Figure 7 and Figure 8 Along the third direction Z, one end of the sixth insulating part 153 is connected to the fifth insulating part 152, and the other end of the sixth insulating part 153 protrudes from the first electrode 11 adjacent to the sixth insulating part 153. With this arrangement, the sixth insulating part 153 can improve the insulation performance between the second main body 131 and the adjacent first electrode 11, and reduce the risk of short circuit between the second main body 131 and the first electrode 11.

[0069] In some embodiments, please refer to Figure 7 and Figure 8 Each first electrode 11 is provided with a second clearance opening 118. Along the third direction Z, the second clearance opening 118 and the aforementioned first notch 114 are located on both sides of the first head 112. When viewed along the first direction X, the second clearance opening 118 and the second notch 134 at least partially overlap. The second clearance opening 118 is used to avoid the second electrode tab 133, thereby reducing the risk of the second electrode tab 133 contacting the first electrode 11, thus reducing the risk of short circuit, and facilitating the welding and fixing of the second electrode tabs 133 of multiple second electrodes 13 together.

[0070] In some embodiments, along the first direction X, the projection of the first electrode 11 onto the wall of the second clearance opening 118 is located within the second insulating member 15. With this configuration, when the second electrode tab 133 is impacted and bent or displaced, the second insulating member 15 can prevent the second electrode tab 133 from contacting the first electrode 11, thereby reducing the risk of short circuit in the electrochemical device 1.

[0071] In some embodiments, along the first direction X, the projection of the second tab 133 of the second electrode 13 is completely contained within the second clearance opening 118, thereby reducing the risk of short circuit between the second tab 133 and the first electrode 11.

[0072] In some embodiments, the fourth insulating portion 151 and the fifth insulating portion 152 are integrally formed, thereby increasing the strength of the second insulating member 15 and thus improving the buffering capacity of the second insulating member 15 for the second electrode tab 133 when it is impacted, reducing the risk of short circuit in the electrochemical device 1.

[0073] In some embodiments, the fifth insulating portion 152 and the sixth insulating portion 153 are integrally formed, thereby increasing the strength of the second insulating member 15 and thus improving the buffering capacity of the second insulating member 15 for the second tab 133 when it is impacted, reducing the risk of short circuit in the electrochemical device 1.

[0074] In some embodiments, the fourth insulating portion 151 and the sixth insulating portion 153 can be separated. Separation means that there can be a gap between the fourth insulating portion 151 and the sixth insulating portion 153, or it can be just a cutting line, so that the fourth insulating portion 151 and the sixth insulating portion 153 can be separated in the second direction Y, and the ends of the fourth insulating portion 151 and the sixth insulating portion 153 in the third direction Z can be connected by the fifth insulating portion 152.

[0075] In some embodiments, please refer to Figure 7 and Figure 8 The second electrode 13 includes a second current collector 136 and a second active material layer 137. The second current collector 136 includes a second current collector body 1361 and a second current collector head 1362. The second active material layer 137 includes a second active material layer body 1371 and a second active material layer head 1372. The second active material layer body 1371 is disposed on the second current collector body 1361, and the second active material layer head 1372 is disposed on the second current collector head 1362. The second current collector body 1361 and the second active material layer body 1371 together constitute the aforementioned second main body 131, and the second current collector head 1362 and the second active material layer head 1372 together constitute the aforementioned second head 132. The second electrode tab 133 extends from the second current collector head 1362 in a third direction Z. The fourth surface 1311 of the aforementioned second main body 131 is disposed on the second current collector body 1361, and the aforementioned second active material layer body 1371 is disposed on the fourth surface 1311.

[0076] In this embodiment, by providing both the first insulating portion 141 and the second insulating portion 142 on the first surface 1131 of the first electrode tab 113, and along the second direction Y, the first insulating portion 141 is located on the side of the first surface 1131 closer to the first main body portion 111, and the second insulating portion 142 is located on the side of the first surface 1131 along the third direction Z closer to the first head 112, and the first insulating portion 141 and the second insulating portion 142 are connected, on the one hand, when the first electrode tab 113 is impacted, the first insulating portion 141 and the second insulating portion 142 can provide a buffering effect, which helps to reduce the bending deformation or displacement of the first electrode tab 113, reduce the risk of the first electrode tab 113 contacting the adjacent second electrode piece 13, and thus reduce the risk of short circuit; on the other hand, even if the first electrode tab 113 is impacted and bent or displaced, the first insulating portion 141 and the second insulating portion 142 can also prevent the first electrode tab 113 from forming an electrical connection with the adjacent second electrode piece 13, further reducing the risk of short circuit.

[0077] This application also provides an embodiment of an electrical device, which includes the electrochemical device 1 described above. For the specific structure and function of the electrochemical device 1, please refer to the above embodiments, which will not be repeated here.

[0078] This application also provides a method for manufacturing the electrochemical device 1. Please refer to [link to relevant documentation]. Figure 9 The method includes: Step 01: Provide a first electrode 11, a diaphragm 12, a second electrode 13, and a first insulating member 14. The first electrode 11 includes a first main body 111 and a first head 112. One end of the first head 112 is connected to the first main body 111 along the second direction Y. A first tab 113 is connected to the first head 112 of the first electrode 11 along the third direction Z. The first insulating member 14 includes a first insulating part 141 and a second insulating part 142 connected to each other. The first insulating member 14 is disposed on the first surface 1131 of the first tab 113. The first insulating part 141 of the first insulating member 14 is located on the side of the first surface 1131 along the second direction Y close to the first main body 111, and the second insulating part 142 is disposed on the side of the first surface 1131 along the third direction Z close to the first head 112. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Step 02: The first electrode 11 and the second electrode 13 are alternately stacked along the first direction X, wherein the diaphragm 12 is disposed between the first electrode 11 and the second electrode 13 to obtain the electrochemical device 1.

[0079] In this embodiment, the first insulating part 141 and the second insulating part 142 are both disposed on the first surface 1131 of the first electrode tab 113. Along the second direction Y, the first insulating part 141 is located on the side of the first surface 1131 closer to the first main body 111, and the second insulating part 142 is located on the side of the first surface 1131 along the third direction Z closer to the first head 112. The first insulating part 141 and the second insulating part 142 are connected. On the one hand, when the first electrode tab 113 is impacted, the first insulating part 141 and the second insulating part 142 can provide a buffering effect, which helps to reduce the bending deformation or displacement of the first electrode tab 113, reduce the risk of the first electrode tab 113 contacting the adjacent second electrode piece 13, and thus reduce the risk of short circuit. On the other hand, even if the first electrode tab 113 is impacted and bent or displaced, the first insulating part 141 and the second insulating part 142 can also prevent the first electrode tab 113 from forming an electrical connection with the adjacent second electrode piece 13, further reducing the risk of short circuit.

[0080] In some embodiments, please refer to Figure 10 The steps of providing the first electrode 11 and the first insulating member 14 further include: Step 011: Provide the first current collector fabric and the first active material; Step 012: Coat the first active material onto the first current collector fabric to form the first electrode panel 2, such as... Figure 12 As shown; Step 013: Peel off a portion of the first active material from the first electrode panel 2 to form a plurality of first grooves 21 on the first electrode panel 2, such as... Figure 13 As shown, a plurality of first grooves 21 are arranged in an array, and the first electrode panel 2 has two first walls 211 and one second wall 212 in each of the first grooves 21, with the two ends of the second wall 212 respectively connected to the two first walls 211. Step 014: Provide a plurality of first insulating materials 22, and place one first insulating material 22 in a first groove 21, the first insulating material 22 covering all of the second wall 212 and at least a portion of the two first walls 211, such as Figure 14 As shown; Step 015: Cut the first insulating material 22 and the first electrode panel 2 to obtain multiple first electrode plates 11 and multiple first insulating components.

[0081] In this embodiment, by first coating the first active material onto the first current collector fabric and then peeling off a portion of the first active material, a plurality of first grooves 21 are formed on the first electrode panel 2, which is simple to operate. In addition, by cutting the first insulating material 22 and the first electrode panel 2, a plurality of first electrodes 11 and a plurality of first insulating components are obtained. Compared with the method of processing the first electrodes 11 and the first insulating components one by one, the efficiency is higher, thereby saving costs.

[0082] In some embodiments, please refer to Figure 11 as well as Figures 14 to 19 The step of cutting the first insulating material 22 and the first electrode panel 2 to obtain the plurality of first electrode sheets 11 and the plurality of first insulating components further includes: Step 0151: Cut the first electrode panel 2 along the first tangent line H to divide the first electrode panel 2 into multiple first electrode strips 3. The first tangent line H passes through the second wall 212, cuts the first groove 21 to form two first half-grooves 213, and cuts the first insulating material 22 to form two L-shaped first insulating sheets 23. One first insulating sheet 23 is located in one first half-groove 213. The two first half-grooves 213 in the first groove 21 are respectively located in two adjacent first electrode strips 3. Step 0152: Cut along the edge of the first half-groove 213 on each first electrode strip 3 that does not cover the first insulating sheet 23, and then cut each first electrode strip 3 along the second tangent line F to obtain multiple first die-cut electrode sheets 4, wherein the second tangent line F is aligned with the junction of the first wall 211 of the first half-groove 213 where the first insulating sheet 23 is provided and where the first insulating sheet 23 is not provided; Step 0153: Cut the portion of the first current collector fabric located in the first half-groove 213 along the direction parallel to the second wall 212 of the first half-groove 213 to obtain multiple first electrode sheets 11. The portion of the first current collector fabric located in the first half-groove 213 constitutes the first electrode tab 113. The cutting also divides the first insulating sheet 23 located in the second wall 212 of the first half-groove 213 into a first insulating part 141 and a third insulating part 143. The first insulating part 141 is located in the first electrode tab 113, and the third insulating part 143 is located in the first half-groove 213. The portion of the first insulating sheet 23 that abuts against the second wall 212 constitutes the third insulating part 143.

[0083] In this embodiment, by cutting the portion of the first current collector fabric located in the first half-groove 213, a plurality of first electrode plates 11 are obtained, and the portion of the first current collector fabric located in the first half-groove 213 constitutes a first electrode tab 113. This allows the first gap mentioned above to be formed between the first electrode tab 113 and the first main body, which facilitates welding the ends of each first electrode tab 113 away from the first head to each other, reduces the welding difficulty between each first electrode tab 113, and helps to improve production efficiency.

[0084] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An electrochemical device comprising a first electrode, a diaphragm, and a second electrode, wherein the first electrode and the second electrode are stacked along a first direction, the diaphragm is disposed between the first electrode and the second electrode, the first electrode comprising a first body portion and a first head portion, one end of the first head portion being connected to the first body portion along a second direction, and a first tab being disposed on one side of the first head portion along a third direction, and the second electrode portion comprising a second tab, characterized in that, The projection of the first electrode along the second direction at least partially overlaps with the first body; The electrochemical device further includes a first insulating element, which includes a first insulating portion and a second insulating portion connected to each other, and the first insulating portion and the second insulating portion are both disposed on the first surface of the first electrode tab; The first insulating portion of the first insulating member is disposed on the side of the first surface near the first main body along the second direction, and the second insulating portion of the first insulating member is disposed on the side of the first surface near the first head along the third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

2. The electrochemical device according to claim 1, characterized in that, The first electrode tab is connected to the first head through the second insulating part.

3. The electrochemical device according to claim 1, characterized in that, The number of the first electrode, the diaphragm, the second electrode, and the first insulating member are all multiple. The multiple first electrode and the multiple second electrode are alternately stacked along the first direction. A diaphragm is disposed between adjacent first electrode and second electrode. A first insulating member is disposed on the first surface of a first electrode tab. Wherein, a first insulating portion of the first insulating member is disposed on a side of the first surface along the second direction near the first main body portion, and a second insulating portion of the first insulating member is disposed on a side of the first surface along the third direction near the first head.

4. The electrochemical device according to claim 3, characterized in that, Along the third direction, the width of the first head is smaller than the width of the first body portion, the first head and the first body portion are jointly constructed with a first notch, and one end of the first electrode is connected to the side wall of the first head at the first notch. Along the second direction, there is a first gap between the first electrode tab and the first main body portion, and the first insulating portion is at least partially disposed in the first gap.

5. The electrochemical device according to claim 4, characterized in that, Along the third direction, one end of the first insulating portion is aligned with one end of the first electrode tab, and the other end of the first insulating portion extends along the third direction; Along the third direction, at least a portion of the first insulating portion protrudes from the second electrode adjacent to the first insulating portion.

6. The electrochemical device according to claim 4, characterized in that, The first insulating member includes a third insulating portion disposed on the second surface of the first main body portion and along the second direction, the third insulating portion is located at one end of the second surface near the first gap, and the third insulating portion is connected to the second insulating portion.

7. The electrochemical device according to claim 6, characterized in that, Along the third direction, one end of the third insulating part is connected to the second insulating part, and the other end of the third insulating part protrudes from the second electrode adjacent to the third insulating part.

8. The electrochemical device according to claim 6, characterized in that, The first insulating portion and the second insulating portion are integrally formed; and / or, the second insulating portion and the third insulating portion are integrally formed.

9. The electrochemical device according to claim 6, characterized in that, Along the second direction, the third insulating portion and the second insulating portion are disposed separately.

10. The electrochemical device according to claim 1, characterized in that, The second electrode is provided with a first clearance opening; When viewed along the first direction, the first clearance opening and the first notch at least partially overlap, and along the first direction, the projection of the second electrode onto the wall of the first clearance opening is located within the first insulating member.

11. The electrochemical device according to claim 3, characterized in that, Along the third direction, the first electrode tab at least partially protrudes from the first body portion.

12. The electrochemical device according to any one of claims 1-11, characterized in that, The first electrode includes a first current collector and a first active material layer. The first current collector includes a first current collector body and a first current collector head. The first active material layer includes a first active material layer body and a first active material layer head. The first active material layer body is disposed on the first current collector body, and the first active material layer head is disposed on the first current collector head. The first current collector body and the first active material layer body together constitute the first main body. The first current collector head and the first active material layer head together constitute the first head. The first electrode tab extends from the first current collector head in a third direction.

13. The electrochemical device according to any one of claims 1-11, characterized in that, The second electrode includes a second main body and a second head. One end of the second head is connected to the second main body along a second direction, one end of the second electrode tab is connected to the second head, and the other end of the second electrode tab extends along a third direction. The projection of the second electrode ear along the second direction at least partially overlaps with the second main body portion; The electrochemical device further includes a second insulating component, which includes a fourth insulating portion and a fifth insulating portion connected to each other, both of which are disposed on the third surface of the second electrode tab; The fourth insulating portion of the second insulating member is disposed on the side of the third surface near the second main body portion along the second direction, and the fifth insulating portion of the second insulating member is disposed on the side of the third surface near the second head along the third direction.

14. The electrochemical device according to claim 13, characterized in that, When there are multiple first electrode plates, diaphragms, and second electrode plates, there are multiple second insulating members, and one second insulating member is disposed on the third surface of a second electrode tab; Wherein, a fourth insulating portion of the second insulating member is disposed on the third surface along the second direction near the second main body portion, and a fifth insulating portion of the second insulating member is disposed on the third surface along the third direction near the second head.

15. The electrochemical device according to claim 14, characterized in that, Along the third direction, the width of the second head is smaller than the width of the second body portion, the second head and the second body portion are jointly constructed with a second notch, and one end of a second electrode is connected to the side wall of the second head at the second notch; Along the second direction, there is a second gap between the second electrode tab and the second main body portion.

16. The electrochemical device according to claim 15, characterized in that, The second insulating member includes a sixth insulating portion disposed on the fourth surface of the second main body portion and along the second direction, the sixth insulating portion is located at one end of the fourth surface near the second gap, and the sixth insulating portion is connected to the fifth insulating portion.

17. The electrochemical device according to claim 15, characterized in that, The first electrode is also provided with a second clearance opening; When viewed along the first direction, the second clearance opening and the second notch at least partially overlap, and along the first direction, the projection of the first electrode onto the wall of the second clearance opening is located within the second insulating member.

18. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1-17.

19. A method for manufacturing an electrochemical device as described in any one of claims 1-17, characterized in that, include: A first electrode, a diaphragm, a second electrode, and a first insulating member are provided. The first electrode includes a first body portion and a first head. One end of the first head is connected to the first body portion along a second direction. A first electrode tab is disposed on one side of the first head along a third direction. The first insulating member includes a first insulating portion and a second insulating portion connected to each other. The first insulating member is disposed on a first surface of the first electrode tab. The first insulating portion of the first insulating member is disposed on one end of the first surface along the second direction near the first body portion, and the second insulating portion is disposed on one end of the first surface along the third direction near the first head. The first direction, the second direction, and the third direction are perpendicular to each other. The first electrode and the second electrode are stacked along a first direction, wherein the diaphragm is disposed between the first electrode and the second electrode.

20. The method according to claim 19, characterized in that, The step of providing the first electrode and the first insulating element further includes: Provide the first fluid-collecting fabric and the first active material; The first active material is coated onto the first current collector fabric to form the first electrode panel; A portion of the first active material on the first electrode panel is peeled off to form a plurality of first grooves on the first electrode panel. The plurality of first grooves are arranged in an array, and each of the first grooves on the first electrode panel has two first walls and one second wall, with the two ends of the second wall respectively connected to the two first walls. A plurality of first insulating materials are provided, and one of the first insulating materials is disposed in a first groove, the first insulating materials covering all of the second wall and at least a portion of the two first walls; The first insulating material and the first electrode panel are cut to obtain a plurality of first electrode sheets and a plurality of first insulating components.

21. The method according to claim 20, characterized in that, The step of cutting the first insulating material and the first electrode panel to obtain a plurality of first electrode sheets and a plurality of first insulating components further includes: The first electrode panel is cut along the first tangent line to divide the first electrode panel into multiple first electrode strips. The first tangent line passes through the second wall, cuts the first groove to form two first half-grooves, and cuts the first insulating material to form two L-shaped first insulating sheets. One first insulating sheet is located in one first half-groove, and the two first half-grooves in the first groove are respectively located in two adjacent first electrode strips. For each of the first electrode strips, cut along the edge of the first half groove on the first electrode strip that does not cover the first insulating sheet, and then cut each of the first electrode strips along the second tangent to obtain a plurality of first die-cut electrode sheets, wherein the second tangent is aligned with the junction of the first wall of the first half groove where the first insulating sheet is provided and where the first insulating sheet is not provided; Along the direction parallel to the second wall of the first half-groove, the portion of the first current collector fabric located in the first half-groove is cut to obtain a plurality of first electrode sheets. The portion of the first current collector fabric located in the first half-groove constitutes the first electrode tab. The cutting also divides the first insulating sheet located on the second wall of the first half-groove into a first insulating part and a third insulating part. The first insulating part is located on the first electrode tab, and the third insulating part is located in the first half-groove. The portion of the first insulating sheet that abuts against the second wall constitutes the third insulating part.

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