Pole piece, battery cell, single battery and battery pack

Abstract

The application relates to the technical field of energy storage devices, and discloses a pole piece, a battery cell, a single battery and a battery pack. The pole piece comprises a main body, a tab and a leg. The main body has opposite first and second ends. The tab is connected to the first end of the main body and extends outward. The leg is connected to the second end of the main body. The first end can be referred to as a tab end, and the second end can be referred to as a non-tab end. The leg extends a certain length from one side of the main body in a direction perpendicular to the extension direction of the tab. Therefore, the leg of the pole piece protrudes from one side of the main body. After the pole piece and a diaphragm are stacked to form a battery cell, the leg can limit the diaphragm in the extension direction of the tab, effectively preventing the movement of the pole pieces in the direction of the tab. After the battery cell is installed in the shell of a single battery, the leg can be used to support the shell, supporting the second end (non-tab end) of the main body, thereby avoiding suspension, and thus helping to enhance stability and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, in particular to a pole piece, a battery cell, a single battery and a battery pack. BACKGROUND

[0002] With the development of new energy power batteries, new energy power batteries are widely used in electric vehicles. As the main power source of electric vehicles, how to efficiently use limited space and improve energy density is the key to meet the long endurance demand of new energy electric vehicles. At present, the related technology adopts a CTP whole-pack design scheme, which can improve the utilization rate of the internal space of the battery pack. The single battery matched with it adopts a long battery structure with pole lugs at both ends of the laminated sheet. By increasing the length of the single battery, the single battery is designed to be flat and long, forming a long battery structure. The energy and grouping efficiency of the single battery of the long battery structure are improved. However, the single battery of the long battery structure in the current battery cell design process adopts a laminated structure. One end of each pole piece with a lug is welded and fixed with a pole column on the top cover, and the other end of the pole piece is fixed by adhesive bonding through the diaphragm coating. This structure forms a suspension at the non-lug end of the pole piece, which has risks in safety and reliability. In addition, in the actual application working condition of the battery in the later stage, the pole pieces are easily displaced in the lug direction under the action of vibration and impact, which affects the performance and safety of the battery. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a pole piece, which is provided with a supporting leg, which can be used to limit the diaphragm and avoid displacement of the pole pieces in the lug direction, thereby helping to enhance the stability and safety of the structure.

[0004] The present application also provides a battery cell having the above-mentioned pole piece and a single battery comprising the same.

[0005] The present application also provides a battery pack comprising the single battery.

[0006] The pole piece of the first aspect embodiment of the present application comprises:

[0007] a main body having opposite first and second ends;

[0008] a lug connected to the first end and extending outwardly;

[0009] a supporting leg connected to the second end of the main body, and the supporting leg extends a certain length from one side edge of the main body along a direction perpendicular to the extension direction of the lug, so that the supporting leg can serve as a supporting point of the pole piece.

[0010] The tab of the first aspect embodiment of the present application has at least the following beneficial effects: the leg of the tab extends a certain length along a side of the main body perpendicular to the extension direction of the tab, so that after the battery is incorporated into the shell, the leg can be used as a support point of the tab to resist the shell, thereby supporting the second end (non-tab end) of the main body, thereby avoiding the second end from being suspended. Moreover, since the leg extends along a side of the main body perpendicular to the extension direction of the tab, when applied in a battery, the leg can resist the diaphragm in the extension direction of the tab to limit the position, effectively preventing the relative movement of the tabs in the direction of the tab, thereby helping to enhance the stability and safety of the battery.

[0011] According to some embodiments of the present application, the second end of the main body has an insulating area, and the leg is connected to the insulating area, and the insulating area and the leg are coated with an insulating layer.

[0012] According to some embodiments of the present application, the insulating layer is a ceramic insulating layer.

[0013] According to some embodiments of the present application, the insulating area has an overhang area on one side towards the first end.

[0014] According to some embodiments of the present application, the insulating area has a first edge on one side towards the first end, and the leg has a second edge on one side towards the first end, the distance h1 between the first edge and the first end is less than the distance h2 between the second edge and the first end, and the part of the insulating area between the first edge and the second edge forms the overhang area.

[0015] The battery of the second aspect embodiment of the present application comprises a diaphragm and a plurality of the above-mentioned first aspect embodiment tabs, wherein:

[0016] Some of the plurality of tabs are positive tabs, and the other are negative tabs, the tab ear of the positive tab is a positive tab ear, and the tab ear of the negative tab is a negative tab ear;

[0017] The diaphragm is folded to form a plurality of layers of gaps, the positive tabs and the negative tabs are alternately arranged in the gaps, and the main body of the positive tab and the main body of the negative tab are parallel along the folding direction of the diaphragm and separated by the diaphragm;

[0018] The positive tab ear and the negative tab ear respectively extend out of the two ends of the diaphragm, the leg of the positive tab and the leg of the negative tab are respectively located at the two ends of the diaphragm along the extension direction of the tab ear, and protrude out of the diaphragm along a direction perpendicular to the extension direction of the tab ear.

[0019] The electric core of the second aspect embodiment of the present application has at least the following beneficial effects: the feet of the positive electrode sheets and the feet of the negative electrode sheets can be used to support the shell, thus the second end (non-tab end) of the main body of each electrode sheet can be supported, thereby avoiding the second end of the electrode sheet being suspended, and the separator is located between the feet of the positive electrode sheets and the feet of the negative electrode sheets, thus the feet at both ends of the separator can limit the two ends of the separator in the direction in which the tabs extend, effectively avoiding the relative movement between the electrode sheets in the direction of the tabs, thereby enhancing the stability and safety of the electric core.

[0020] According to the electric core of some embodiments of the present application, the portions of the feet of each of the positive electrode sheets that protrude outside the separator along a direction perpendicular to the extension direction of the tabs are fixed together by a first connecting piece, and the portions of the feet of each of the negative electrode sheets that protrude outside the separator along a direction perpendicular to the extension direction of the tabs are fixed together by a second connecting piece.

[0021] According to the electric core of some embodiments of the present application, the first connecting piece is a bundling adhesive tape, and the first connecting piece bundles and fixes the feet of each of the positive electrode sheets together; the second connecting piece is a bundling adhesive tape, and the second connecting piece bundles and fixes the feet of each of the negative electrode sheets together.

[0022] The monomer battery of the third aspect embodiment of the present application comprises:

[0023] The shell has an inner cavity, and the shell is provided with openings at both ends that communicate with the inner cavity;

[0024] The electric core of the second aspect embodiment described above is accommodated in the inner cavity, and the positive tab and the negative tab are respectively located at the openings at both ends of the shell; the feet of each of the positive electrode sheets are supported on the bottom wall of the shell, and the feet of each of the negative electrode sheets are supported on the bottom wall of the shell.

[0025] The monomer battery of the third aspect embodiment of the present application has at least the following beneficial effects: the feet of the positive electrode sheets and the feet of the negative electrode sheets are supported on the bottom wall of the shell, thus in the electric core of the monomer battery, the second end (non-tab end) of the main body of each electrode sheet can be supported on the shell, thereby avoiding the electrode sheet being suspended, and the stability and safety of the structure of the monomer battery are enhanced.

[0026] The battery pack of the fourth aspect embodiment of the present application comprises a box body and a plurality of monomer batteries of the third aspect embodiment described above, and the monomer batteries are accommodated in the box body.

[0027] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below in conjunction with the drawings and embodiments, in which:

[0029] Figure 1 is a structural schematic diagram of a positive plate and a negative plate in a conventional long battery structure;

[0030] Figure 2 is a structural schematic diagram of a single battery formed by laminating and assembling the plate shown in Figure 1

[0031] Figure 3 is a structural schematic diagram of a positive plate of one embodiment of the application;

[0032] Figure 4 is a structural schematic diagram of a negative plate of one embodiment of the application;

[0033] Figure 5 is a structural schematic diagram of an electric core of one embodiment of the application;

[0034] Figure 6 is a structural schematic diagram of a single battery of one embodiment of the application. Figure 5

[0035] Figure 7 is a sectional view of the electric core of the embodiment shown in

[0036] Reference signs:

[0037] positive plate 1, negative plate 2, positive tab 3, negative tab 4, diaphragm 5, shell 6;

[0038] plate 100, main body 110, first end 111, second end 112, insulating area 113, first edge 114, overhang area 115, tab 120, leg 130, second edge 131, positive plate 101, negative plate 102, positive tab 121, negative tab 122;

[0039] electric core 200, diaphragm 210, gap 211, first connecting piece 220, second connecting piece 230;

[0040] single battery 300, shell 310, inner cavity 311, opening 312, bottom wall 313, mylar film 320. DETAILED DESCRIPTION

[0041] The embodiments of the application are described in detail below, examples of which are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application. ​​

[0042] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and cannot be understood as 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 limiting the present application.

[0043] In the description of the present application, if the above, the following, within, etc. are understood as including the number. If there is a description of the first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0044] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Figure 1 is a schematic view of the structure of the positive and negative electrode sheets in the conventional long battery structure, Figure 2 is a schematic view of the structure of the positive and negative electrode sheets in the conventional long battery structure, Figure 1 is a schematic view of the process of forming a single battery of the conventional long battery structure by laminating the electrode sheets shown, Figure 1 and Figure 2 At present, in the design of the single battery of the conventional long battery structure, the electrode sheet adopts a conventional structure, the main body of the electrode sheet is approximately rectangular, the tab is located at one end of the main body of the electrode sheet, the electrode sheet is divided into a positive electrode sheet 1 and a negative electrode sheet 2, and the electrode sheet is stacked with a separator 5 to form a battery cell. The positive tab 3 and the negative tab 4 are respectively located at the two ends, the battery cell is inserted into the shell from one end of the shell 6, the positive tab 3 and the negative tab 4 are respectively located at the two end openings of the shell, one end of each electrode sheet containing the tab is welded and fixed to the pole of the top cover, and the other end of the electrode sheet is fixed by the adhesive of the separator coating. However, this structure forms a suspension at the non-tab end of the electrode sheet, which has a risk of safety and reliability. In the later vibration and impact working conditions, the electrode sheets are prone to displacement in the direction of the tab, which affects the performance and safety of the battery.

[0047] This application addresses the aforementioned issues by improving the structure of the electrode, enabling it to limit the position of the diaphragm, preventing displacement between electrodes in the tab direction, and effectively supporting the non-tab ends of the electrodes, thereby enhancing the stability and safety of the structure. Figure 3 This is a schematic diagram of the structure of a positive electrode sheet according to an embodiment of this application. Figure 4 This is a schematic diagram of the negative electrode sheet according to an embodiment of this application. (Refer to...) Figure 3 and Figure 4 The electrode 100 of the first aspect of this application includes a main body 110, an electrode tab 120, and a support leg 130. The main body 110 has a first end 111 and a second end 112. The electrode tab 120 is connected to the first end 111 of the main body 110 and extends outward. The support leg 130 is connected to the second end 112 of the main body 110. The first end 111 can be referred to as the electrode tab end, and the second end 112 can be referred to as the non-electrode tab end. The support leg 130 extends a predetermined length from one side edge of the main body 110 along a direction perpendicular to the extension of the electrode tab 120. Therefore, the support leg 130 can serve as a support point for the electrode 100. After being applied in a battery cell and installed in a housing, the support leg 130 can be used to support the housing, thereby supporting the second end 112 (non-electrode tab end) of the main body 110 and preventing the second end 112 from being suspended. Figure 5 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application. Figure 6 for Figure 5 The illustrated embodiment is a cross-sectional view of the battery cell along section AA. Figure 7 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application, with reference to... Figures 3 to 7 In this embodiment, the electrode 100 can be used to be laminated and assembled with the separator 210 to form a cell 200. The cell 200 is then installed in a casing to form a long battery structure single cell 300. The electrode 100 can be divided into a positive electrode 101 (e.g., ...). Figure 3 ) and negative electrode 102 (such as Figure 4 The positive electrode 101 and negative electrode 102 are only functionally different; both adopt the structure of the electrode 100 described in the above embodiment. The positive electrode 101, negative electrode 102, and Z-folded separator 210 form the battery cell 200 (e.g., Figure 5 and Figure 6 The second ends 112 of the positive electrode 101 and the negative electrode 102, and the supports 130 of the positive electrode 101 and the negative electrode 102 respectively connected to the second ends 112 are all located outside the separator 210; after the cell 200 is installed into the housing 310 (as shown in the image), the second ends 112 of the positive electrode 101 and the negative electrode 102 are all located outside the separator 210. Figure 7), the foot 130 can be used to resist on the bottom wall of the shell 310, achieving the support of the second end 112 (non-tab end) of the main body 110, thereby avoiding suspension, and the foot 130 extends from the edge of the main body 110, so that the diaphragm 210 can be limited in the tab extension direction in the battery cell 200. The one end of the positive plate 101 provided with the foot 130 and the one end of the negative plate 102 provided with the foot 130 are respectively located on both sides of the length direction of the battery cell 200, and the feet 130 on both sides clasp the diaphragm 210 therebetween to limit the diaphragm 210, at the same time, the diaphragm 210 is also limited in turn, so that the positive plate 101 and the negative plate 102 are difficult to move along the length direction of the battery cell 200, thereby effectively avoiding the dislocation of any two of the positive plate 101, the diaphragm 210 and the negative plate 102, and helping to enhance the stability and safety of the battery cell 200.

[0048] With reference to Figure 3 and Figure 4 , in the plate 100 of some embodiments of the present application, the second end 112 has an insulating area 113, the foot 130 is connected to the insulating area 113 and protrudes from one side of the long edge of the main body 110, and the insulating area 113 and the foot 130 are coated with an insulating layer (such as a ceramic insulating film layer), which can effectively guarantee the insulation performance.

[0049] With reference to Figure 3 and Figure 4 , in the plate 100 of some embodiments of the present application, the insulating area 113 has an overhang area 115 (the overhang area refers to the part of the length and width of the negative plate for winding that is outside the positive plate) on the side toward the first end 111, and the overhang area 115 is located on the side of the insulating area 113 toward the first end 111, which can ensure that the foot 130 is located on the side of the diaphragm 210 after lamination, thereby being able to limit the diaphragm 210, avoiding the displacement of the plate 100 in the tab 120 direction under the actual application working condition of the battery in the later stage, and affecting the battery performance and safety.

[0050] With reference to Figure 3 and Figure 4In some embodiments of the application, the tab 100 has a first edge 114 on the side of the insulating area 113 facing the first end 111, and the leg 130 has a second edge 131 on the side of the leg 130 facing the first end 111. The distance h1 between the first edge 114 and the first end 111 is less than the distance h2 between the second edge 131 and the first end 111. Thus, the portion of the insulating area 113 between the first edge 114 and the second edge 131 forms an overhang area 115, and the leg 130 is located on the side of the overhang area 115 away from the first end 111. After the tab 100 is stacked into the battery cell 200, the second edge 131 of the leg 130 can limit the position of the separator 210 in the direction in which the tab 120 extends.

[0051] In some embodiments of the application, the tab 100 has a first edge 114 on the side of the insulating area 113 facing the first end 111, and the leg 130 has a second edge 131 on the side of the leg 130 facing the first end 111. The distance h1 between the first edge 114 and the first end 111 is less than the distance h2 between the second edge 131 and the first end 111. Thus, the portion of the insulating area 113 between the first edge 114 and the second edge 131 forms an overhang area 115, and the leg 130 is located on the side of the overhang area 115 away from the first end 111. After the tab 100 is stacked into the battery cell 200, the second edge 131 of the leg 130 can limit the position of the separator 210 in the direction in which the tab 120 extends.

[0052] Figure 5 A structural schematic diagram of a battery cell according to an embodiment of the application, Figure 6 A structural schematic diagram of a battery cell according to an embodiment of the application, Figure 5 A sectional view of the battery cell along the A-A plane according to the embodiment shown in FIG. 4, Figure 5 A sectional view of the battery cell along the A-A plane according to the embodiment shown in FIG. 4, Figure 6The second aspect embodiment of the present application provides an electric core 200, comprising a diaphragm 210 and a plurality of the above-mentioned first aspect embodiment of the pole piece 100. According to the connection requirement of the positive electrode terminal and the negative electrode terminal, the plurality of pole pieces 100 are divided into positive pole pieces 101 and negative pole pieces 102, that is, part of the plurality of pole pieces 100 are positive pole pieces 101, and the other part are negative pole pieces 102. As can be known from the above-mentioned embodiment, the pole piece 100 has a tab 120, for the sake of convenience, the tab 120 of the positive pole piece 101 is a positive tab 121, and the tab 120 of the negative pole piece 102 is a negative tab 122. The diaphragm 210 can be folded into multiple layers of gaps 211 by using a laminating machine. The positive pole piece 101 and the negative pole piece 102 are alternately arranged in the gap 211 of the diaphragm 210. The main body 110 of the positive pole piece 101 and the main body 110 of the negative pole piece 102 are parallel along the folding direction of the diaphragm 210 and are separated by the diaphragm 210. Thus, the electric core 200 is stacked. The positive tab 121 and the negative tab 122 of the electric core 200 respectively protrude from both ends of the diaphragm 210. The leg 130 of the positive pole piece 101 and the leg 130 of the negative pole piece 102 are respectively located at both ends of the diaphragm 210 along the protruding direction of the tab 120, and protrude outward from the diaphragm 210 along a direction perpendicular to the protruding direction of the tab 120. Therefore, the diaphragm 210 is located between the leg 130 of the positive pole piece 101 and the leg 130 of the negative pole piece 102. The legs 130 on both sides of the diaphragm 210 clamp the diaphragm 210 therebetween to limit the diaphragm 210. At the same time, the diaphragm 210 is also limited, which in turn makes the positive pole piece 101 and the negative pole piece 102 difficult to move along the length direction of the electric core 200. Thus, it is effectively avoided that any two of the positive pole piece 101, the diaphragm 210 and the negative pole piece 102 are dislocated. This helps to enhance the stability and safety of the electric core 200.

[0053] In addition, in the electric core 200, the leg 130 of each positive pole piece 101 protrudes from the same side of the diaphragm 210 perpendicular to the protruding direction of the tab 120, and is stacked. Therefore, after the electric core 200 is put into the shell 310, the leg 130 of each positive pole piece 101 can be used to abut against the shell 310. Similarly, the leg 130 of each negative pole piece 102 protrudes from the same side of the diaphragm 210 perpendicular to the protruding direction of the tab 120, and is stacked. After the electric core 200 is put into the shell 310, the leg 130 of each negative pole piece 102 can be used to abut against the shell 310. Therefore, the second end 112 (non-tab end) of the main body 110 of each pole piece 100 can be supported by the leg 130, so as to avoid the non-tab end from being suspended, and the structural stability of the electric core 200 is enhanced.

[0054] Reference Figure 6 In the electric core 200 of some embodiments of the present application, the leg 130 of the positive pole piece 101 and the leg 130 of the negative pole piece 102 protrude from the same side of the diaphragm 210 perpendicular to the protruding direction of the tab 120, for example Figure 6In the middle, the support legs 130 of the positive electrode 101 and the support legs 130 of the negative electrode 102 both protrude from the lower side of the separator 210. Therefore, after the cell 200 is installed in the casing, all the support legs 130 of the positive electrode 101 and all the support legs 130 of the negative electrode 102 can be used to abut against the inner wall of the casing on the same side, which facilitates the structural design of the cell 200 and the casing 310. Moreover, the non-pole ends of the positive electrode 101 and the negative electrode 102 are subjected to basically the same force, ensuring that the forces on both ends of the cell 200 are balanced.

[0055] Figure 7 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application, with reference to... Figure 7 The third aspect of this application provides a single-cell battery 300, including a housing 310 and a cell 200 as described in the second aspect embodiment. The housing 310 has an inner cavity 311, and openings 312 at both ends of the housing 310 communicating with the inner cavity 311. The cell 200 is housed in the inner cavity 311 of the housing 310. The outer surface of the cell 200 is covered with a mylar film 320. A positive electrode tab 121 and a negative electrode tab 122 extend out of the mylar film 320 and are located at the openings 312 at both ends of the housing 310 to facilitate connection to the terminal blocks. In the cell 200, the legs 130 of each positive electrode 101 abut against the bottom wall 313 of the housing 310, and the legs 130 of each negative electrode 102 abut against the bottom wall 313 of the housing 310. Therefore, the second end 112 (non-tab end) of the main body 110 of each electrode 100 is supported by the legs 130 on the bottom wall 313 of the housing 310, thereby avoiding suspension and enhancing the stability and safety of the cell 200 structure, thereby improving the safety and reliability of the single cell 300.

[0056] refer to Figure 6 and Figure 7 In some embodiments of the single-cell battery 300, the supports 130 of each positive electrode 101 are bound and fixed by a first connector 220, and the supports 130 of each negative electrode 102 are bound and fixed by a second connector 230. The first connector 220 and the second connector 230 can be made of insulating adhesive tape. Binding multiple supports 130 increases strength, thereby ensuring support and preventing the supports 130 from becoming loose and affecting their support strength or their ability to limit the position of the separator 210.

[0057] A fourth aspect of this application provides a battery pack (not shown, but some structures can be referenced). Figures 1 to 7), including a box and a plurality of the single battery 300 of the third aspect embodiment described above, and the single battery 300 is accommodated in the box. The plurality of single batteries 300 can be assembled in the box in the form of a module after being assembled into a module, or the plurality of single batteries 300 can also be directly assembled into the box in the CTP mode. As described above, the safety and reliability of the single battery 300 are improved by optimizing the structure of the tab 100, and therefore the battery pack with the single battery 300 also has the advantages described above.

[0058] The single battery and the battery pack of the embodiments of the present application can be applied to a power battery system, for example, can be used as the main power source of an electric vehicle. The structure of the single battery has a significant influence on the energy density and safety of the power battery. As described above, the single battery of the embodiments of the present application adopts the long battery structure with the pole post arranged at two ends, which can effectively improve the energy and grouping efficiency, and the structure of the tab and the battery cell is optimized to effectively improve the safety and reliability of the single battery, thereby realizing a stable and safe battery pack.

[0059] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A pole piece characterized by, The application relates to a battery cell, comprising: a main body having opposite first and second ends; a tab connected to the first end and extending outwardly; a foot connected to the second end of the main body, the main body and the foot being an integral structure, and the foot extending from a side edge of the main body by a certain length along a direction perpendicular to the extending direction of the tab, so that the foot can serve as a support point of the tab; the foot has a second edge towards the first end, and the second edge is used for limiting a diaphragm in the extending direction of the tab.

2. The pole piece of claim 1, wherein The second end of the main body has an insulating area, and the foot is connected to the insulating area; the insulating area and the foot are coated with an insulating layer.

3. The pole piece of claim 2, wherein The insulating layer is a ceramic insulating layer.

4. The pole piece of claim 2, wherein The insulating area has an overhang area towards the first end.

5. The pole piece of claim 4, wherein The insulating area has a first edge towards the first end, and the distance h1 between the first edge and the first end is smaller than the distance h2 between the second edge and the first end; the part of the insulating area between the first edge and the second edge forms the overhang area.

6. An electric cell, characterized by The application further relates to a battery, comprising a diaphragm and a plurality of the battery cells as claimed in any one of claims 1 to 5, wherein: a part of the plurality of battery cells are positive battery cells, and the other part are negative battery cells; the tab of the positive battery cell is a positive tab, and the tab of the negative battery cell is a negative tab; the diaphragm is folded to form a plurality of layers of gaps; the positive battery cells and the negative battery cells are arranged alternately in the gaps; the main body of the positive battery cell and the main body of the negative battery cell are parallel along the folding direction of the diaphragm and are separated by the diaphragm; the positive tab and the negative tab extend from two ends of the diaphragm respectively; the foot of the positive battery cell and the foot of the negative battery cell are respectively located at the two ends of the diaphragm along the extending direction of the tab and protrude out of the diaphragm along a direction perpendicular to the extending direction of the tab.

7. The electric cell of claim 6, wherein, The parts of the foot of each positive battery cell, which protrude out of the diaphragm along the direction perpendicular to the extending direction of the tab, are fixed together by a first connecting member; the parts of the foot of each negative battery cell, which protrude out of the diaphragm along the direction perpendicular to the extending direction of the tab, are fixed together by a second connecting member.

8. The electric cell of claim 7, wherein, The first connecting member is a bundling adhesive tape, which bundles and fixes the feet of the positive battery cells together; the second connecting member is a bundling adhesive tape, which bundles and fixes the feet of the negative battery cells together.

9. A single cell characterized by The application further relates to a battery pack, comprising: a shell having an inner cavity, and the shell is provided with openings at two ends of the shell, which communicate with the inner cavity; the battery cell as claimed in any one of claims 6 to 8 is accommodated in the inner cavity, and the positive tab and the negative tab are respectively located at the openings at the two ends of the shell; the foot of each positive battery cell abuts against a bottom wall of the shell, and the foot of each negative battery cell abuts against the bottom wall of the shell.

10. A battery pack, characterized by, The application further relates to a battery pack, comprising a box and a plurality of the battery cells as claimed in claim 9, and the plurality of battery cells are accommodated in the box.

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