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 connected to 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] The embodiments of the present application relate 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 Art

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

[0003] During actual use, electronic devices are bound to fall or collide, which may cause the battery cells inside the electronic devices to fall or collide. How to reduce the risk of short circuits in battery cells in scenarios such as falling and impact has become an important research topic. Summary of the invention

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

[0005] In order to solve the above technical problems, a technical solution adopted in an embodiment of the present application is: to provide an electrochemical device, including a first pole piece, a diaphragm, a second pole piece and a first insulating member; the first pole piece and the second pole piece are alternately stacked along a first direction, a diaphragm is arranged between adjacent first pole pieces and second pole pieces, the first pole piece 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, the first head extends a first pole ear along a third direction, and the second pole piece extends a second pole ear; the first insulating member includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion and the second insulating portion are both arranged on the first surface of the first pole ear; the first insulating portion of the first insulating member is arranged on a side of the first surface close to the first main body along the second direction, and the second insulating portion of the first insulating member is arranged on a side of the first surface close to the first head along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0006] In this embodiment, by providing the first insulating portion and the second insulating portion, on the one hand, a buffering effect can be provided when the first pole ear is impacted, which is beneficial to reduce the bending deformation or displacement of the first pole ear, and reduce the risk of contact between the first pole ear and the adjacent second pole piece, thereby reducing the risk of short circuit; on the other hand, by providing the first insulating member, even if the first pole ear is impacted and bent, deformed or displaced, the first insulating member can also prevent the first pole ear from forming an electrical connection with the adjacent second pole piece, thereby further reducing the risk of short circuit.

[0007] In some embodiments, the number of the first pole piece, the diaphragm, the second pole piece and the first insulating member are all multiple, the multiple first pole pieces and the multiple second pole pieces are alternately stacked along the first direction, a diaphragm is arranged between adjacent first pole pieces and second pole pieces, and a first insulating member is arranged on the first surface of a first pole ear; wherein the first insulating portion of a first insulating member is arranged on a side of a first surface close to the first main body along the second direction, and the second insulating portion of a first insulating member is arranged on a side of a first surface close to the first head along the third direction. By arranging multiple first pole pieces and multiple second pole pieces, the capacity of the electrochemical device can be increased.

[0008] In some embodiments, along the third direction, the width of the first head portion is smaller than the width of the first main body portion, the first head portion and the first main body portion are jointly configured with a first notch, and one end of a first pole ear is connected to a side wall of the first notch of the first head portion; along the second direction, there is a first gap between the first pole ear and the first main body portion, and the first insulating portion is at least partially disposed in the first gap.

[0009] In this embodiment, by forming a first gap between the first pole ear and the first main body, it is convenient to weld the ends of the first pole ears away from the first head to each other, thereby reducing the difficulty of welding between the first pole ears and the risk of tearing at the edges when the first pole ears are gathered together, which is beneficial to improving production efficiency.

[0010] In some embodiments, along the third direction, one end of the first insulating portion is aligned with one end of the first pole ear, and the other end of the first insulating portion extends along the third direction; along the third direction, at least part of the first insulating portion protrudes from a second pole piece adjacent to the first insulating portion.

[0011] In this embodiment, by making at least a portion of the first insulating portion protrude from the second pole piece adjacent to the first insulating portion, the first insulating portion can block the contact between the first pole tab and the second pole piece, thereby reducing the risk of short circuit.

[0012] In some embodiments, the first insulating member includes a third insulating portion, which is disposed on the second surface of the first main body portion, and along the second direction, the third insulating portion is located on one side of the second surface close to the first gap, and the third insulating portion is connected to the second insulating portion.

[0013] In this embodiment, by providing a third insulating part and connecting the third insulating part to the second insulating part, the buffering effect of the first insulating member on the first pole ear 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 pole piece, thereby reducing the risk of short circuit between the first main body and the second pole piece.

[0014] In some embodiments, along the 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 pole piece adjacent to the third insulating portion. In this way, the third insulating portion can improve the insulation performance between the first main body and the adjacent second pole piece, and reduce the risk of short circuit between the first main body and the second pole piece.

[0015] 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. By integrally forming, the strength of the first insulating member can be improved, thereby improving the buffering ability of the first insulating member to the first tab when it is hit, and reducing the risk of short circuit of the electrochemical device.

[0016] In some embodiments, the third insulating portion and the second insulating portion are separated along the second direction. This can reduce the risk of the edges of the plurality of first tabs being pulled by the third insulating portion and the second insulating portion and causing tearing when they are gathered. The separation arrangement means that there may be a gap between the third insulating portion and the second insulating portion, or there may be only a cutting line, so that the third insulating portion and the second insulating portion can be separated in the second direction, and the ends of the third insulating portion and the second insulating portion in the third direction can be connected by the first insulating portion.

[0017] In some embodiments, the second pole piece is provided with a first avoidance opening; when viewed along the first direction, the first avoidance opening and the first notch at least partially overlap, and along the first direction, the projection of the second pole piece on the wall surface of the first avoidance opening is located within the first insulating member.

[0018] In this embodiment, by providing the first avoidance opening to avoid the first pole ear, the risk of the first pole ear contacting the second pole piece can be reduced, thereby reducing the risk of short circuit and facilitating the welding and fixing of the first pole ears of the first pole piece to each other.

[0019] In some embodiments, along the third direction, the first pole tab at least partially protrudes from the first main body, thereby providing more operating space for welding connections between the first pole tabs, which is beneficial to reducing the difficulty of welding operations and improving production efficiency.

[0020] In some embodiments, the first pole piece 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 arranged on the first current collector body, the first active material layer head is arranged 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, and the first pole ear is obtained by extending from the first current collector head along a third direction.

[0021] In some embodiments, the second pole piece includes a second main body and a second head, one end of the second head is connected to the second main body along the second direction, one end of the second pole ear is connected to the second head, and the other end of the second pole ear extends along the third direction; the projection of the second pole ear along the second direction at least partially overlaps with the second main body; the electrochemical device also includes a second insulating member, the second insulating member includes a fourth insulating portion and a fifth insulating portion connected to each other, and the fourth insulating portion and the fifth insulating portion are both arranged on the third surface of the second pole ear; the fourth insulating portion of the second insulating member is arranged on a side of the third surface along the second direction close to the second main body, and the fifth insulating portion of the second insulating member is arranged on a side of the third surface along the third direction close to the second head.

[0022] In this embodiment, by providing the fourth insulating part and the fifth insulating part, on the one hand, a buffering effect can be provided when the second pole ear is impacted, which is beneficial to reduce the bending deformation or displacement of the second pole ear, and reduce the risk of contact between the second pole ear and the adjacent first pole piece, thereby reducing the risk of short circuit; on the other hand, by providing the second insulating member, even if the second pole ear is impacted and bent, deformed or displaced, the second insulating member can also prevent the second pole ear from forming an electrical connection with the adjacent first pole piece, thereby further reducing the risk of short circuit.

[0023] In some embodiments, when there are multiple first pole pieces, diaphragms, and second pole pieces, there are multiple second insulating members, and a second insulating member is disposed on the third surface of a second pole piece; wherein a fourth insulating portion of a second insulating member is disposed on a side of a third surface close to the second main body along the second direction, and a fifth insulating portion of a second insulating member is disposed on a side of a third surface close to the second head along the third direction. By providing multiple second insulating members, and a second insulating member is disposed on the third surface of a second pole piece, the risk of the second pole piece forming an electrical connection with an adjacent first pole piece can be prevented, thereby reducing the risk of a short circuit.

[0024] In some embodiments, along the third direction, the width of the second head portion is smaller than the width of the second main body portion, the second head portion and the second main body portion are jointly configured with a second notch, and one end of a second pole ear is connected to the side wall of the second notch of the second head portion; along the second direction, there is a second gap between the second pole ear and the second main body portion.

[0025] In this embodiment, by forming a second gap between the second pole ear and the second main body, it is convenient to weld the ends of the second pole ears away from the second head to each other, which can reduce the difficulty of welding between the second pole ears and reduce the risk of tearing at the edges when the first pole ears are gathered together, which is conducive to improving production efficiency.

[0026] In some embodiments, the second insulating member includes a sixth insulating portion, which is 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 close to the second gap, and the sixth insulating portion is connected to the fifth insulating portion.

[0027] In this embodiment, by providing a sixth insulating part and connecting the sixth insulating part to the fifth insulating part, the buffering effect of the second insulating member on the second pole ear when it is impacted can be enhanced, and the sixth insulating part can also enhance the insulation effect between the second main body and the first pole piece, thereby reducing the risk of short circuit between the second main body and the first pole piece.

[0028] In some embodiments, the first pole piece is further provided with a second avoidance opening; when viewed along the first direction, the second avoidance opening and the second notch at least partially overlap, and along the first direction, the projection of the first pole piece on the wall surface of the second avoidance opening is located within the second insulating member. In this embodiment, the second avoidance opening is used to avoid the second pole ear, which can reduce the risk of the second pole ear contacting the first pole piece, thereby reducing the risk of short circuit, and facilitates welding and fixing the second pole ears of multiple second pole pieces to each other.

[0029] The beneficial effects of the embodiments of the present application are as follows: different from the prior art, in the embodiments of the present application, by providing the first insulating portion and the second insulating portion, on the one hand, a buffering effect can be provided when the first pole ear is impacted, which is beneficial to reduce the bending deformation or displacement of the first pole ear, and reduce the risk of contact between the first pole ear and the adjacent second pole piece, thereby reducing the risk of short circuit; on the other hand, by providing the first insulating member, even if the first pole ear is impacted and bent, deformed or displaced, the first insulating member can also prevent the first pole ear from forming an electrical connection with the adjacent second pole piece, thereby further reducing the risk of short circuit.

[0030] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present application is: to provide an electrical equipment, including the above electrochemical device.

[0031] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present application is: providing a method for manufacturing an electrochemical device, comprising:

[0032] A first pole piece, a diaphragm, a second pole piece and a first insulating member are provided, wherein the first pole piece comprises 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 pole ear is connected to the first head of a first pole piece along a third direction, the first insulating member comprises a first insulating portion and a second insulating portion connected to each other, a first insulating member is arranged on a first surface of a first pole ear, a first insulating portion of a first insulating member is arranged on an end of a first surface close to the first main body along the second direction, and a second insulating portion is arranged on an end of a first surface close to the first head along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other;

[0033] The first pole pieces and the second pole pieces are alternately stacked along a first direction, wherein a diaphragm is disposed between adjacent first pole pieces and second pole pieces.

[0034] In this embodiment, the first insulating portion and the second insulating portion are both arranged on the first surface of the first pole ear, and along the second direction, the first insulating portion is located on the side of the first surface close to the first main body portion, and the second insulating portion is located on the side of the first surface close to the first head portion along the third direction, and the first insulating portion and the second insulating portion are connected. On the one hand, when the first pole ear is impacted, the first insulating portion and the second insulating portion can provide a buffering effect, which is beneficial to reduce the bending deformation or displacement of the first pole ear, reduce the risk of contact between the first pole ear and the adjacent second pole piece, and thereby reduce the risk of short circuit; on the other hand, even if the first pole ear is impacted and bent, deformed or displaced, the first insulating portion and the second insulating portion can also prevent the first pole ear from forming an electrical connection with the adjacent second pole piece, further reducing the risk of short circuit.

[0035] In some embodiments, the step of providing a first pole piece and a first insulating member further comprises:

[0036] Providing a first current collector fabric and a first active material;

[0037] Applying the first active material to the first current collector surface to form a first pole panel;

[0038] Peeling off a portion of the first active material on the first pole panel to form a plurality of first grooves on the first pole panel, wherein the plurality of first grooves are arranged in an array, and each of the first grooves of the first pole panel has two first walls and one second wall, and two ends of the second wall are respectively connected to the two first walls;

[0039] Providing a plurality of first insulating materials, and disposing a first insulating material in a first groove, wherein the first insulating material covers the entire second wall and at least a portion of the two first walls;

[0040] The first insulating material and the first pole piece panel are cut to obtain a plurality of first pole pieces and a plurality of first insulating members.

[0041] In this embodiment, the first active material is first coated on the first current collector surface, and then part of the first active material is peeled off to form a plurality of first grooves on the first pole piece panel, and the operation is simple; in addition, a plurality of first pole pieces and a plurality of first insulating parts are obtained by cutting the first insulating material and the first pole piece panel, which is more efficient than processing the first pole pieces and the first insulating parts one by one, thereby saving costs.

[0042] In some embodiments, the step of cutting the first insulating material and the first pole piece panel to obtain a plurality of first pole pieces and a plurality of first insulating members further comprises:

[0043] The first pole piece panel is cut along the first tangent line H to divide the first pole piece panel into a plurality of first pole piece strips, wherein the first tangent line H passes through the second wall, the first groove is cut to form two first half grooves, and the first insulating material is cut to form two L-shaped first insulating sheets, one first insulating sheet is located in one first half groove, and two first half grooves in the first groove are respectively located in two adjacent first pole piece strips;

[0044] Cutting each first electrode strip along the edge of the first half groove on the first electrode strip that is not covered by the first insulating sheet, and then cutting each first electrode strip along the second tangent line F to obtain a plurality of 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;

[0045] The portion of the first current collector surface located in the first half slot is cut along a direction parallel to the second wall of the first half slot to obtain a plurality of first pole pieces, wherein the portion of the first current collector surface located in the first half slot constitutes a first pole ear, and the cutting also divides the first insulating sheet located on the second wall of the first half slot into a first insulating portion and a third insulating portion, the first insulating portion is located in the first pole ear, the third insulating portion is located in the first half slot, and the portion of the first insulating sheet abutting against the second wall constitutes the third insulating portion.

[0046] In this embodiment, a plurality of first pole pieces are obtained by cutting the portion of the first current collector surface located in the first half slot, and the portion of the first current collector surface located in the first half slot constitutes a first pole ear. This allows the formation of the above-mentioned first gap between the first pole ear and the first main body, making it convenient to weld the ends of the first pole ears away from the first head to each other, thereby reducing the difficulty of welding between the first pole ears and helping to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. 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 according to the actual scale.

[0048] Figure 1 is a schematic diagram of the structure of the electrochemical device provided in the embodiments of the present application;

[0049] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure of AA;

[0050] Figure 3 yes Figure 2 A magnified view of the area shown in middle A;

[0051] Figure 4 is a schematic structural diagram of a first pole piece and a first insulating member provided in an embodiment of the present application;

[0052] Figure 5 is a schematic diagram of the exploded structure of the first pole piece and the first insulating member provided in an embodiment of the present application;

[0053] Figure 6 is a schematic diagram of the exploded structure of the first pole piece, the first insulating member, the diaphragm, and the second pole piece provided in an embodiment of the present application;

[0054] Figure 7 is a schematic structural diagram of a second pole piece and a second insulating member provided in an embodiment of the present application;

[0055] Figure 8 is a schematic diagram of the exploded structure of the first pole piece, the first insulating member, the diaphragm, and the second pole piece provided in an embodiment of the present application;

[0056] Fig. 9 is a flow chart for manufacturing an electrochemical device provided in an embodiment of the present application;

[0057] Fig.10 yes Fig. 9 Detailed flowchart of step 01 in ;

[0058] Fig.11 yes Fig.10 A detailed flow chart of step 015;

[0059] Fig.12 is a schematic structural diagram of a first pole piece panel provided in an embodiment of the present application when the first groove is not formed;

[0060] Fig.13 is a schematic structural diagram of a first pole piece panel provided in an embodiment of the present application after a first groove is formed;

[0061] Fig.14 is a schematic structural diagram of a first electrode panel provided in an embodiment of the present application after being formed with a first insulating material;

[0062] Fig.15 yes Fig.14 A magnified view of the area shown in part B;

[0063] Fig.16 is a schematic structural diagram of a first pole piece strip provided in an embodiment of the present application;

[0064] Fig.17 yes Fig.16Schematic diagram of cutting position in;

[0065] Fig.18 is a schematic structural diagram of a first die-cut pole piece provided in an embodiment of the present application;

[0066] Fig.19 It is a schematic diagram of the structure of the first pole piece provided in an embodiment of the present application.

[0067] Reference Numbers

[0068] DETAILED DESCRIPTION

[0069] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with 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 another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application 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 cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0070] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0071] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0072] See also Figure 1 , Figure 2 and Figure 3 The electrochemical device 1 includes a first pole piece 11, a diaphragm 12 and a second pole piece 13. The first pole piece 11 and the second pole piece 13 are stacked along a first direction X. The diaphragm 12 is arranged between the first pole piece 11 and the second pole piece 13. The diaphragm 12 is used to insulate and isolate the first pole piece 11 and the second pole piece 13 to reduce the risk of short circuit.

[0073] In some embodiments, see Figure 4 The first pole piece 11 includes a first main body 111, a first head 112 and a first pole ear 113. One end of the first head 112 is connected to the first main body 111 along a second direction Y, and the second direction Y is perpendicular to the first direction X. One end of the first pole ear 113 is connected to the first head 112, and the other end of the first pole ear 113 extends along a third direction Z, that is, the first pole ear 113 is obtained 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 perpendicular to each other. Along the second direction Y, the projection of the first pole ear 113 at least partially overlaps with the first main body 111, and the first pole ear 113 is used to realize the electrical connection between the first pole piece 11 and other components. Please combine Figure 6 The second pole piece 13 is extended with a second pole ear 133, and the second pole ear 133 is used to realize the electrical connection between the second pole piece 13 and other components.

[0074] It is worth noting that in the related art, when the electrochemical device 1 is hit, the tab is more likely to shift than other parts, so that the tab is easily inserted into the adjacent pole piece, thereby causing a short circuit. To solve the above problem, in some embodiments, refer to Figure 3 , Figure 4 and Figure 5 The electrochemical device 1 further includes a first insulating member 14, the first insulating member 14 includes a first insulating portion 141 and a second insulating portion 142 connected to each other, the first electrode tab 113 has a first surface 1131, and the first insulating portion 141 and the second insulating portion 142 are both disposed on the first surface 1131. The first insulating portion 141 of the first insulating member 14 is disposed on a side of the first surface 1131 close to the first main body portion 111 along the second direction Y, and the second insulating portion 142 of the first insulating member 14 is disposed on a side of the first surface 1131 close to the first head portion 112 along the third direction Z. In this embodiment, by providing the first insulating portion 141 and the second insulating portion 142, on the one hand, a buffering effect can be provided when the first pole ear 113 is impacted, which is beneficial to reduce the bending deformation or displacement of the first pole ear 113, and reduce the risk of contact between the first pole ear 113 and the adjacent second pole piece 13, thereby reducing the risk of short circuit; on the other hand, by providing the first insulating member 14, even if the first pole ear 113 is impacted and bent, deformed or displaced, the first insulating member 14 can also prevent the first pole ear 113 from forming an electrical connection with the adjacent second pole piece 13, thereby further reducing the risk of short circuit.

[0075] In the present application, component A is disposed on one side of the surface of component B along direction C, which means that component A covers the edge of component B and is located between one side of the surface of component B along direction C and the center of the component.

[0076] It is worth noting that, in the present application, the number of the first pole piece 11, the diaphragm 12, the second pole piece 13 and the first insulating member 14 can be one, such as Figure 6 and Figure 8 In addition, the number of the first pole piece 11, the diaphragm 12, the second pole piece 13 and the first insulating member 14 can also be multiple, such as Figures 1 to 3 As shown, at this time, a plurality of first pole pieces 11 and a plurality of second pole pieces 13 are alternately stacked along the first direction X, and a diaphragm 12 is disposed between adjacent first pole pieces 11 and second pole pieces 12, and the diaphragm 12 is used to insulate and isolate the adjacent first pole pieces 11 and second pole pieces 13, and a first insulating member 14 is disposed on a first surface 1131 of a first pole ear 113. Specifically, please refer to Figure 4 The first insulating portion 141 of the first insulating member 14 is disposed on a side of the first surface 1131 close to the first main body 111 along the second direction Y, and the second insulating portion 142 of the first insulating member 14 is disposed on a side of the first surface 1131 close to the first head 112 along the third direction Z. By providing a plurality of first pole pieces 11, diaphragms 12, second pole pieces 13 and first insulating members 14, the capacity of the electrochemical device 100 can be increased; in addition, when the first pole tab 113 is impacted and bent or displaced, the first insulating member 14 can prevent the first pole tab 113 from forming an electrical connection with the adjacent second pole piece 13, thereby reducing the risk of short circuit.

[0077] In some embodiments, see Figure 4 , along the third direction Z, the width of the first head 112 is smaller than the width of the first main body 111, and the first head 112 and the first main body 111 are jointly configured with a first notch 114, one end of a first pole ear 113 is connected to a side wall of the first head 112 at the first notch 114, and the other end of the first pole ear 113 extends along the third direction Z. Along the second direction Y, there is a first gap 115 between the first pole ear 113 and the first main body 111. In the production process of the electrochemical device 1, the first pole ears 113 of each first pole sheet 11 need to be welded to each other to form an electrical connection. In this embodiment, by forming the first gap 115 between the first pole ear 113 and the first main body 111, it is convenient to weld the ends of each first pole ear 113 away from the first head 112 to each other, reducing the difficulty of welding between each first pole ear 113, which is conducive to improving production efficiency.

[0078] In some embodiments, see Figure 4 Along the third direction Z, at least a portion of the first pole tabs 113 protrudes from the first main body portion 111 , thereby providing more operating space for welding connections between the first pole tabs 113 , which is beneficial to reducing the difficulty of welding operations and improving production efficiency.

[0079] In some embodiments, see Figure 6 , along the third direction Z, one end of the first insulating portion 141 is aligned with one end of the first pole tab 113 close to the first head 112, and the other end of the first insulating portion 141 extends along the third direction Z. Along the third direction Z, at least a portion of the first insulating portion 141 protrudes from the second pole piece 13 adjacent to the first insulating portion 141. In the third direction Z, if the length of the first insulating portion 141 is too short, it is difficult for the first insulating portion 141 to block the contact between the first pole tab 113 and the second pole piece 13. Therefore, in this embodiment, by making at least a portion of the first insulating portion 141 protrude from the second pole piece 13 adjacent to the first insulating portion 141, the first insulating portion 141 can block the contact between the first pole tab 113 and the second pole piece 13, thereby reducing the risk of short circuit.

[0080] In some embodiments, see 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, the third insulating portion 143 is arranged on the second surface 1111, and along the second direction Y, the third insulating portion 143 is located on the side of the second surface 1111 close to 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 pole lug 113 when it is impacted can be enhanced, and the third insulating portion 143 can also enhance the insulation effect between the first main body 111 and the second pole piece 13, reducing the risk of short circuit between the first main body 111 and the second pole piece 13.

[0081] In some embodiments, see Figure 4 and Figure 6 Along the third direction Z, one end of the third insulating portion 143 is connected to the second insulating portion 142, and the other end of the third insulating portion 143 protrudes from the second pole piece 13 adjacent to the third insulating portion 143. In this way, the third insulating portion 143 can improve the insulation performance between the first main body portion 111 and the adjacent second pole piece 13, and reduce the risk of short circuit between the first main body portion 111 and the second pole piece 13.

[0082] In some embodiments, see Figure 6 Each second pole piece 13 is provided with a first avoidance opening 138. When observed along the first direction X, the first avoidance opening 138 and the first notch 114 at least partially overlap. The first avoidance opening 138 is used to avoid the first pole ear 113 to reduce the risk of contact between the first pole ear 113 and the second pole piece 13, thereby reducing the risk of short circuit and facilitating the welding and fixing of the first pole ears 113 of the first pole piece 11 to each other.

[0083] In some embodiments, along the first direction X, the projection of the second pole piece 13 on the wall of the first avoidance opening 138 is located within the first insulating member 14. With such a configuration, when the first pole ear 113 is impacted and bent or displaced, the first insulating member 14 can prevent the first pole ear 113 from contacting the second pole piece 13, thereby reducing the risk of short circuit in the electrochemical device 1.

[0084] In some embodiments, along the first direction X, the projection of the first pole ear 113 of the first pole piece 11 is completely contained within the projection of the first avoidance opening 138 , thereby reducing the risk of short circuit between the first pole ear 113 and the second pole piece 13 .

[0085] In some embodiments, the first insulating portion 141 and the second insulating portion 142 are integrally formed, thereby improving the strength of the first insulating member 14 and further improving the buffering ability of the first insulating member 14 on the first electrode tab 113 when it is impacted, thereby reducing the risk of short circuit in the electrochemical device 1 .

[0086] In some embodiments, the second insulating portion 142 and the third insulating portion 143 are integrally formed, thereby improving the strength of the first insulating member 14 and further improving the buffering ability of the first insulating member 14 on the first electrode tab 113 when it is impacted, thereby reducing the risk of short circuit in the electrochemical device 1 .

[0087] In some embodiments, the third insulating portion 143 and the second insulating portion 142 are separated along the second direction Y. This can reduce the risk of the first tab being torn by the third insulating portion 143 and the second insulating portion 142 when the first tab is folded. Separate arrangement means that there may be a gap between the third insulating portion 143 and the second insulating portion 142, or there may be only one cutting line, so that the third insulating portion 143 and the second insulating portion 142 can be separated in the second direction Y, and the ends of the third insulating portion 143 and the second insulating portion 142 in the third direction Z can be connected by the first insulating portion 141.

[0088] In some embodiments, see Figure 5The first pole piece 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 first main body 111, and the first current collector head 1162 and the first active material layer head 1172 together constitute the first head 112. The first pole tab 113 is obtained by extending from the first current collector head 1162 along the third direction Z. The second surface 1111 of the first main body 111 is disposed on the first current collector body 1161, and the first active material layer body 1171 is disposed on the second surface 1111.

[0089] In some embodiments, see Figure 7 The second pole piece 13 includes a second main body 131 and a second head 132, and one end of the second head 132 is connected to the second main body 131 along the second direction Y. One end of the second pole ear 133 is connected to the second head 132, and the other end of the second pole ear 133 extends along the third direction Z, that is, the second pole ear 133 is obtained by extending the second head 132 along the third direction Z. Along the second direction Y, the projection of the second pole ear 133 at least partially overlaps with the second main body 131. The second pole ear 133 is used to realize the electrical connection between the second pole piece 13 and other components. The projection of the second pole ear 133 at least partially overlaps with the second main body 131, which can prevent the second pole ear 133 from exceeding the second head 132 and occupying the head space of the electrochemical device 1.

[0090] In some embodiments, see Figure 7 and Figure 8The electrochemical device 1 further includes a second insulating member 15, the second insulating member 15 includes a fourth insulating portion 151 and a fifth insulating portion 152 connected to each other, the second pole tab 133 has a third surface 1331, and the fourth insulating portion 151 and the fifth insulating portion 152 are both arranged on the third surface 1331. The fourth insulating portion 151 of the second insulating member 15 is arranged on a side of the third surface 1331 of the second pole tab 133 close to the second main body portion 131 along the second direction Y, and the fifth insulating portion 152 of the second insulating member 15 is arranged on a side of the third surface 1331 of the second pole tab 133 close to the second head portion 132 along the third direction Z. In this embodiment, by providing the fourth insulating part 151 and the fifth insulating part 152, on the one hand, a buffering effect can be provided when the second pole ear 133 is impacted, which is beneficial to reduce the bending deformation or displacement of the second pole ear 133, and reduce the risk of the second pole ear 133 contacting the adjacent first pole piece 11, thereby reducing the risk of short circuit; on the other hand, by providing the second insulating member 15, even if the second pole ear 133 is impacted and bent, deformed or displaced, the second insulating member 15 can also prevent the second pole ear 133 from forming an electrical connection with the adjacent first pole piece 11, thereby further reducing the risk of short circuit.

[0091] It is worth noting that when the number of the first pole piece 11, the diaphragm 12 and the second pole piece 13 is one, the number of the second insulating member 15 is also one; and when the number of the first pole piece 11, the diaphragm 12 and the second pole piece 13 is multiple, the number of the second insulating member 15 is also multiple. At this time, a second insulating member 15 is arranged on the third surface 1331 of a second pole ear 133. Specifically, a fourth insulating portion 151 of a second insulating member 15 is arranged on the side of the third surface 1331 of a second pole ear 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 arranged on the side of the third surface 1331 of a second pole ear 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 pole ear 133 , when the second pole ear 133 is impacted and bent or displaced, the second insulating member 15 can prevent the second pole ear 133 from forming an electrical connection with the adjacent first pole piece 11 , thereby reducing the risk of short circuit.

[0092] In some embodiments, see Figure 7, along the third direction Z, the width of the second head 132 is smaller than the width of the second main body 131, and the second head 132 and the second main body 131 are jointly configured with a second notch 134, and along the third direction Z, the second notch 134 and the first avoidance opening 138 are respectively located on two opposite sides of the second head 132. One end of a second pole ear 133 is connected to the side wall of the second head 132 at the second notch 134, and the other end of the second pole ear 133 extends along the third direction Z. Along the second direction Y, there is a first and second gap 135 between the second pole ear 133 and the second main body 131. In the production process of the electrochemical device 1, the second pole ears 133 of each second pole sheet 13 need to be welded to each other to form an electrical connection. In this embodiment, by forming the second gap 135 between the second pole ear 133 and the second main body 131, it is convenient to weld the ends of each second pole ear 133 away from the second head 132 to each other, which can reduce the difficulty of welding between each second pole ear 133, which is conducive to improving production efficiency.

[0093] In some embodiments, see Figure 7 Along the third direction Z, at least a portion of the second pole tabs 133 protrudes from the second main body 131 , thereby providing more operating space for welding connections between the second pole tabs 133 , which is beneficial to reducing the difficulty of welding operations and improving production efficiency.

[0094] In some embodiments, see Figure 7 and Figure 8 , one end of the fourth insulating portion 151 is aligned with one end of the second pole lug 133 close to 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 from the first pole piece 11 adjacent to the fourth insulating portion 151. In the third direction Z, if the length of the fourth insulating portion 151 is too short, it is difficult for the fourth insulating portion 151 to block the contact between the second pole lug 133 and the first pole piece 11. Therefore, in this embodiment, by making at least a portion of the fourth insulating portion 151 protrude from the first pole piece 11 adjacent to the fourth insulating portion 151, the fourth insulating portion 151 can block the contact between the second pole lug 133 and the first pole piece 11, thereby reducing the risk of short circuit.

[0095] In some embodiments, see 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, the sixth insulating portion 153 is disposed on the fourth surface 1311, and along the second direction Y, the sixth insulating portion 153 is located on a side of the fourth surface 1311 close to 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 pole lug 133 when it is impacted can be enhanced, and the sixth insulating portion 153 can also enhance the insulation effect between the second main body 131 and the first pole piece 11, thereby reducing the risk of short circuit between the second main body 131 and the first pole piece 11.

[0096] In some embodiments, see Figure 7 and Figure 8 Along the third direction Z, one end of the sixth insulating portion 153 is connected to the fifth insulating portion 152, and the other end of the sixth insulating portion 153 protrudes from the first pole piece 11 adjacent to the sixth insulating portion 153. In this manner, the sixth insulating portion 153 can improve the insulation performance between the second main body portion 131 and the adjacent first pole piece 11, and reduce the risk of short circuit between the second main body portion 131 and the first pole piece 11.

[0097] In some embodiments, see Figure 7 and Figure 8 Each first pole piece 11 is provided with a second avoidance opening 118. Along the third direction Z, the second avoidance opening 118 and the first notch 114 are respectively located on both sides of the first head 112. Observed along the first direction X, the second avoidance opening 118 and the second notch 134 at least partially overlap. The second avoidance opening 118 is used to avoid the second pole lug 133, so as to reduce the risk of the second pole lug 133 contacting the first pole piece 11, thereby reducing the risk of short circuit, and facilitating the second pole lugs 133 of the plurality of second pole pieces 13 to be welded and fixed to each other.

[0098] In some embodiments, along the first direction X, the projection of the first pole piece 11 on the wall of the second avoidance opening 118 is located within the second insulating member 15. In this way, when the second pole ear 133 is impacted and bent or displaced, the second insulating member 15 can prevent the second pole ear 133 from contacting the first pole piece 11, thereby reducing the risk of short circuit in the electrochemical device 1.

[0099] In some embodiments, along the first direction X, the projection of the second pole ear 133 of the second pole piece 13 is completely contained in the second avoidance opening 118 , thereby reducing the risk of short circuit between the second pole ear 133 and the first pole piece 11 .

[0100] In some embodiments, the fourth insulating portion 151 and the fifth insulating portion 152 are integrally formed, thereby improving the strength of the second insulating member 15 and further improving the buffering ability of the second insulating member 15 on the second electrode tab 133 when it is impacted, thereby reducing the risk of short circuit in the electrochemical device 1 .

[0101] In some embodiments, the fifth insulating portion 152 and the sixth insulating portion 153 are integrally formed, thereby improving the strength of the second insulating member 15 , thereby improving the buffering ability of the second insulating member 15 on the second electrode tab 133 when it is impacted, and reducing the risk of short circuit in the electrochemical device 1 .

[0102] In some embodiments, the fourth insulating part 151 and the sixth insulating part 153 can be separately arranged, and the separated arrangement means that there can be a gap between the fourth insulating part 151 and the sixth insulating part 153, or there can be only a cutting line, so that the fourth insulating part 151 and the sixth insulating part 153 can be separated in the second direction Y, and the ends of the fourth insulating part 151 and the sixth insulating part 153 in the third direction Z can be connected by the fifth insulating part 152.

[0103] In some embodiments, see Figure 7 and Figure 8 The second pole piece 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 second main body 131, and the second current collector head 1362 and the second active material layer head 1372 together constitute the second head 132. The second pole tab 133 is obtained by extending from the second current collector head 1362 along the third direction Z. The fourth surface 1311 of the second main body 131 is disposed on the second current collector body 1361, and the second active material layer body 1371 is disposed on the fourth surface 1311.

[0104] In the embodiment of the present application, the first insulating portion 141 and the second insulating portion 142 are both arranged on the first surface 1131 of the first pole ear 113, and along the second direction Y, the first insulating portion 141 is located on the side of the first surface 1131 close to the first main body portion 111, and the second insulating portion 142 is located on the side of the first surface 1131 close to the first head portion 112 along the third direction Z, and the first insulating portion 141 and the second insulating portion 142 are connected. On the one hand, when the first pole ear 113 is impacted, the first insulating portion 141 and the second insulating portion 142 can provide a buffering effect, which is beneficial to reduce the bending deformation or displacement of the first pole ear 113, reduce the risk of the first pole ear 113 contacting the adjacent second pole piece 13, and thereby reduce the risk of short circuit; on the other hand, even if the first pole ear 113 is impacted and bent, deformed or displaced, the first insulating portion 141 and the second insulating portion 142 can also prevent the first pole ear 113 from forming an electrical connection with the adjacent second pole piece 13, further reducing the risk of short circuit.

[0105] The present application further provides an embodiment of an electrical equipment, the electrical equipment comprising the electrochemical device 1 described above. The specific structure and function of the electrochemical device 1 can be found in the above embodiment, which will not be described one by one here.

[0106] The present application also provides a method for manufacturing an electrochemical device 1, see Fig. 9 , the method comprising:

[0107] Step 01: Provide a first pole piece 11, a diaphragm 12, a second pole piece 13 and a first insulating member 14, the first pole piece 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 pole ear 113 is connected to the first head 112 of a first pole piece 11 along the third direction Z, the first insulating member 14 includes a first insulating portion 141 and a second insulating portion 142 connected to each other, a first insulating member 14 is arranged on a first surface 1131 of a first pole ear 113, the first insulating portion 141 of a first insulating member 14 is located on a side of a first surface 1131 close to the first main body 111 along the second direction Y, and the second insulating portion 142 is arranged on a side of the first surface 1131 close to the first head 112 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other;

[0108] Step 02: Alternately stack the first pole piece 11 and the second pole piece 13 along the first direction X, wherein the diaphragm 12 is disposed between the first pole piece 11 and the second pole piece 13 , to obtain the electrochemical device 1 .

[0109] In this embodiment, the first insulating portion 141 and the second insulating portion 142 are both arranged on the first surface 1131 of the first pole ear 113, and along the second direction Y, the first insulating portion 141 is located on the side of the first surface 1131 close to the first main body portion 111, and the second insulating portion 142 is located on the side of the first surface 1131 close to the first head portion 112 along the third direction Z, and the first insulating portion 141 and the second insulating portion 142 are connected. On the one hand, when the first pole ear 113 is impacted, the first insulating portion 141 and the second insulating portion 142 can provide a buffering effect, which is beneficial to reduce the bending deformation or displacement of the first pole ear 113, reduce the risk of the first pole ear 113 contacting the adjacent second pole piece 13, and thereby reduce the risk of short circuit; on the other hand, even if the first pole ear 113 is impacted and bent, deformed or displaced, the first insulating portion 141 and the second insulating portion 142 can also prevent the first pole ear 113 from forming an electrical connection with the adjacent second pole piece 13, further reducing the risk of short circuit.

[0110] In some embodiments, see Fig.10 , the step of providing the first pole piece 11 and the first insulating member 14 further comprises:

[0111] Step 011: providing a first current collector fabric and a first active material;

[0112] Step 012: Apply the first active material to the first current collector surface to form a first electrode panel 2, such as Fig.12 As shown;

[0113] Step 013: peel off part of the first active material on the first pole panel 2 to form a plurality of first grooves 21 on the first pole panel 2. Fig.13 As shown, a plurality of first grooves 21 are arranged in an array, and the first pole piece panel 2 has two first walls 211 and one second wall 212 in each first groove 21, and both ends of the second wall 212 are respectively connected to the two first walls 211;

[0114] Step 014: Provide a plurality of first insulating materials 22, and place a first insulating material 22 in a first groove 21, wherein the first insulating material 22 covers the entire second wall 212 and at least a portion of the two first walls 211, such as Fig.14 As shown;

[0115] Step 015: Cut the first insulating material 22 and the first pole piece panel 2 to obtain a plurality of first pole pieces 11 and a plurality of first insulating members.

[0116] In this embodiment, the first active material is first coated on the first current collector surface, and then part of the first active material is peeled off to form a plurality of first grooves 21 on the first pole piece panel 2. The operation is simple. In addition, a plurality of first pole pieces 11 and a plurality of first insulating parts are obtained by cutting the first insulating material 22 and the first pole piece panel 2. This is more efficient than processing the first pole pieces 11 and the first insulating parts one by one, thereby saving costs.

[0117] In some embodiments, see Fig.11 as well as Figures 14 to 19 , the step of cutting the first insulating material 22 and the first pole piece panel 2 to obtain the plurality of first pole pieces 11 and the plurality of first insulating members further comprises:

[0118] Step 0151: cutting the first pole piece panel 2 along the first tangent line H to divide the first pole piece panel 2 into a plurality of first pole piece strips 3, wherein the first tangent line H passes through the second wall 212, cutting the first groove 21 to form two first half grooves 213, and cutting 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, and two first half grooves 213 in the first groove 21 are respectively located in two adjacent first pole piece strips 3;

[0119] Step 0152: cutting each first electrode strip 3 along the edge of the first half groove 213 on the first electrode strip 3 that is not covered by the first insulating sheet 23, and then cutting each first electrode strip 3 along the second tangent line F to obtain a plurality of 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;

[0120] Step 0153: Cut the portion of the first current collector surface located in the first half slot 213 along a direction parallel to the second wall 212 of the first half slot 213 to obtain a plurality of first pole sheets 11, wherein the portion of the first current collector surface located in the first half slot 213 constitutes a first pole ear 113, and the cutting also divides the first insulating sheet 23 located on the second wall 212 of the first half slot 213 into a first insulating portion 141 and a third insulating portion 143, wherein the first insulating portion 141 is located in the first pole ear 113, and the third insulating portion 143 is located in the first half slot 213, and the portion of the first insulating sheet 23 abutting against the second wall 212 constitutes the third insulating portion 143.

[0121] In this embodiment, a plurality of first pole sheets 11 are obtained by cutting the portion of the first current collector surface located in the first half groove 213, and the portion of the first current collector surface located in the first half groove 213 constitutes a first pole ear 113, so that the above-mentioned first gap can be formed between the first pole ear 113 and the first main body, which can facilitate the welding of the ends of the first pole ears 113 away from the first head, reduce the difficulty of welding between the first pole ears 113, and help improve production efficiency.

[0122] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An electrochemical device, comprising a first pole piece, a diaphragm, and a second pole piece, wherein the first pole piece and the second pole piece are stacked along a first direction, the diaphragm is disposed between the first pole piece and the second pole piece, the first pole piece comprises 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, the first head has a first pole ear extending along a third direction, and the second pole piece has a second pole ear extending, characterized in that: The projection of the first electrode tab along the second direction at least partially overlaps with the first body; The electrochemical device further includes a first insulating member, the first insulating member 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 a first surface of the first electrode tab; The first insulating portion of the first insulating member is arranged on a side of the first surface close to the first main body along the second direction, and the second insulating portion of the first insulating member is arranged on a side of the first surface close to the first head along the third direction, and 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 number of the first pole piece, the diaphragm, the second pole piece and the first insulating member are all multiple, the multiple first pole pieces and the multiple second pole pieces are alternately stacked along the first direction, a diaphragm is arranged between adjacent first pole pieces and second pole pieces, and a first insulating member is arranged on a first surface of a first pole ear; Among them, a first insulating part of the first insulating member is arranged on a side of the first surface close to the first main body along the second direction, and a second insulating part of the first insulating member is arranged on a side of the first surface close to the first head along the third direction.

3. The electrochemical device according to claim 2, characterized in that Along the third direction, the width of the first head portion is smaller than the width of the first main body portion, the first head portion and the first main body portion are jointly configured with a first notch, and one end of the first electrode tab is connected to a side wall of the first head portion at the first notch; Along the second direction, a first gap is defined between the electrode tab and the first main body portion, and the first insulating portion is at least partially disposed in the first gap.

4. The electrochemical device according to claim 3, 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 a second pole piece adjacent to the first insulating portion.

5. The electrochemical device according to claim 3, characterized in that The first insulating member includes a third insulating portion, which is disposed on the second surface of the first main body portion and is located at one end of the second surface close to the first gap along the second direction. The third insulating portion is connected to the second insulating portion.

6. The electrochemical device according to claim 5, characterized in that Along the 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 pole piece adjacent to the third insulating portion.

7. The electrochemical device according to claim 5, 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.

8. The electrochemical device according to claim 5, characterized in that Along the second direction, the third insulating portion and the second insulating portion are disposed separately.

9. The electrochemical device according to claim 1, characterized in that The second pole piece is provided with a first avoidance opening; When viewed along the first direction, the first avoidance opening and the first notch at least partially overlap, and along the first direction, a projection of the second pole piece on the wall surface of the first avoidance opening is located within the first insulating member.

10. The electrochemical device according to claim 2, characterized in that Along the third direction, the first electrode tab at least partially protrudes from the first main body.

11. The electrochemical device according to any one of claims 1 to 10, characterized in that: The first pole piece 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 arranged on the first current collector body, the first active material layer head is arranged 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, and the first pole ear is obtained by extending from the first current collector head along a third direction.

12. The electrochemical device according to any one of claims 1 to 10, characterized in that: The second pole piece 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 pole ear is connected to the second head, and the other end of the second pole ear extends along a third direction; The projection of the second pole tab along the second direction at least partially overlaps with the second main body; The electrochemical device further includes a second insulating member, the second insulating member includes a fourth insulating portion and a fifth insulating portion connected to each other, and the fourth insulating portion and the fifth insulating portion are both arranged on the third surface of the second electrode tab; The fourth insulating portion of the second insulating member is disposed on a side of the third surface close to the second main body along the second direction, and the fifth insulating portion of the second insulating member is disposed on a side of the third surface close to the second head along the third direction.

13. The electrochemical device according to claim 12, characterized in that When there are multiple first pole pieces, multiple diaphragms and multiple second pole pieces, there are multiple second insulating members, and one second insulating member is disposed on the third surface of one second pole lug; Among them, a fourth insulating portion of the second insulating member is arranged on a side of the third surface along the second direction close to the second main body portion, and a fifth insulating portion of the second insulating member is arranged on a side of the third surface along the third direction close to the second head portion.

14. The electrochemical device according to claim 13, characterized in that Along the third direction, the width of the second head portion is smaller than the width of the second main body portion, the second head portion and the second main body portion are jointly configured with a second notch, and one end of the second pole ear is connected to the side wall of the second notch of the second head portion; Along the second direction, a second gap is defined between the second electrode tab and the second main body.

15. The electrochemical device according to claim 14, characterized in that The second insulating member includes a sixth insulating portion, which is disposed on the fourth surface of the second main body portion and is located at one end of the fourth surface close to the second gap along the second direction. The sixth insulating portion is connected to the fifth insulating portion.

16. The electrochemical device according to claim 14, characterized in that The first pole piece is also provided with a second avoidance opening; When viewed along the first direction, the second avoidance opening and the second notch at least partially overlap, and along the first direction, a projection of the first pole piece on the wall surface of the second avoidance opening is located within the second insulating member.

17. An electrical equipment, characterized in that: Comprising the electrochemical device according to any one of claims 1 to 16.

18. A method for manufacturing an electrochemical device according to any one of claims 1 to 16, characterized in that: include: A first pole piece, a diaphragm, a second pole piece and a first insulating member are provided, wherein the first pole piece comprises 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, the first pole lug is connected to the first head of the first pole piece along a third direction, the first insulating member comprises a first insulating portion and a second insulating portion connected to each other, the first insulating member is arranged on a first surface of the first pole lug, the first insulating portion of the first insulating member is arranged on an end of the first surface close to the first main body along the second direction, and the second insulating portion is arranged on an end of the first surface close to the first head along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The first pole piece and the second pole piece are stacked along a first direction, wherein the diaphragm is disposed between the first pole piece and the second pole piece.

19. The method according to claim 18, characterized in that The step of providing a first pole piece and a first insulating member further comprises: Providing a first current collector fabric and a first active material; Applying the first active material to the first current collector fabric to form a first pole panel; peeling off a portion of the first active material on the first pole piece panel to form a plurality of first grooves on the first pole piece panel, wherein the plurality of first grooves are arranged in an array, and the first pole piece panel has two first walls and one second wall in each of the first grooves, and two ends of the second wall are respectively connected to the two first walls; Providing a plurality of first insulating materials, and disposing one of the first insulating materials in one of the first grooves, wherein the first insulating material covers the entirety of the second wall and at least a portion of the two first walls; The first insulating material and the first pole piece panel are cut to obtain a plurality of the first pole pieces and a plurality of the first insulating members.

20. The method according to claim 19, characterized in that The step of cutting the first insulating material and the first pole piece panel to obtain a plurality of the first pole pieces and a plurality of the first insulating members further comprises: The first pole piece panel is cut along a first tangent line to divide the first pole piece panel into a plurality of first pole piece strips, wherein the first tangent line passes through the second wall, the first groove is cut to form two first half grooves, and the first insulating material is cut to form two L-shaped first insulating sheets, one of the first insulating sheets is located in a first half groove, and two first half grooves in the first groove are respectively located in two adjacent first pole piece strips; Cutting each of the first electrode strips along the edge of the first half groove on the first electrode strip that is not covered by the first insulating sheet, and then cutting each of the first electrode strips along the second tangent line to obtain a plurality of first die-cut electrode sheets, wherein the second tangent line is aligned with the boundary between the first wall of the first half groove where the first insulating sheet is provided and the first wall where the first insulating sheet is not provided; The portion of the first current collector surface located in the first half slot is cut along a direction parallel to the second wall of the first half slot to obtain a plurality of first pole pieces, wherein the portion of the first current collector surface located in the first half slot constitutes a first pole ear, and the cutting also divides the first insulating sheet located on the second wall of the first half slot into a first insulating portion and a third insulating portion, wherein the first insulating portion is located in the first pole ear, the third insulating portion is located in the first half slot, and the portion of the first insulating sheet abutting against the second wall constitutes the third insulating portion.

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