Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery, which belong to the technical field of batteries, the battery cell comprises a cathode piece, an anode piece, a tab, a first protective glue and a second protective glue, the first protective glue is connected to the cathode piece or the anode piece, and the second protective glue is connected to another pole piece opposite to the first protective glue; the diaphragm is arranged between the cathode plate and the anode plate, the close ends of the first protection glue and the second protection glue are provided with positioning structures which are matched with each other, and the diaphragm is clamped between the positioning structures. According to the utility model, the close ends of the first protection glue and the second protection glue are provided with the mutually matched positioning structures to clamp the diaphragm, so that the diaphragm can be positioned and limited when the battery falls or the diaphragm shrinks, OH deficiency caused by diaphragm shrinkage and displacement is prevented, and the improvement of the quality of a battery cell is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core and a battery. Background Art

[0002] In the wound battery structure, the connection form of the pole ear is divided into MTT structure and MTS structure. Among them, the MTT structure is to set a fake pole ear on the pole piece, and the pole ear is welded to the fake pole ear, so the pole ear does not enter the stacking area of ​​the cathode and anode sheets; the MTS structure is to clean out the empty foil area on the pole piece, and weld the pole ear to the empty foil area, so the pole ear will enter the stacking area of ​​the cathode and anode sheets. In the battery with MTS structure, the diaphragm between two adjacent pole pieces used to separate the two pole pieces is easily deviated due to the battery falling or the shrinkage of the diaphragm itself, resulting in insufficient OH (overhang). Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell that can improve the stability and position accuracy of the diaphragm and solve the problem of insufficient OH that may be caused by battery falling or diaphragm shrinkage.

[0004] The utility model also provides a battery using the battery core.

[0005] According to the battery cell of the first embodiment of the utility model, it includes a cathode sheet, an anode sheet, a tab, a first protective glue and a second protective glue. The anode sheet is stacked and wound with the cathode sheet; the tab portion is arranged between the cathode sheet and the anode sheet, and is connected to the cathode sheet or the anode sheet; the first protective glue is connected to the cathode sheet or the anode sheet, and covers the portion of the tab located between the cathode sheet and the anode sheet; the second protective glue is connected to the other electrode sheet opposite to the first protective glue; the diaphragm is stacked and wound between the cathode sheet and the anode sheet, and is used to separate the cathode sheet and the anode sheet; wherein the near ends of the first protective glue and the second protective glue are provided with mutually matching positioning structures, and the diaphragm is clamped between the positioning structures.

[0006] The battery cell according to the embodiment of the utility model has at least the following beneficial effects: the battery cell of this embodiment has mutually matching positioning structures arranged at the near ends of the first protective glue and the second protective glue to clamp the diaphragm, which can position and limit the diaphragm when the battery falls or the diaphragm shrinks, preventing the diaphragm from shrinking or shifting and causing OH deficiency, and helping to improve the quality of the battery cell.

[0007] According to some embodiments of the present invention, the positioning structure includes a protrusion and a groove, one of which is arranged at an end of the first protective glue away from the pole ear, and the other is arranged at an end of the second protective glue close to the first protective glue.

[0008] According to some embodiments of the utility model, the first protective adhesive includes a first adhesive surface, a second adhesive surface and a third adhesive surface connected in sequence along a first direction, the first adhesive surface and the third adhesive surface are located on both sides of the pole ear, the second adhesive surface is attached to the pole ear, and the second adhesive surface protrudes from the first adhesive surface and the third adhesive surface, thereby forming the protrusion.

[0009] According to some embodiments of the present invention, the width of the groove along the first direction is D, the width of the pole ear along the first direction is d, the thickness of the first protective glue is h1, the thickness of the diaphragm is h2, and the battery cell satisfies: D=d+2*h1+2*h2.

[0010] According to some embodiments of the present invention, the depth of the groove is H, the thickness of the tab is I, and the battery cell satisfies: H=I.

[0011] According to some embodiments of the present invention, the first protective glue and the second protective glue are respectively bonded to the proximal ends of the cathode sheet and the anode sheet, and the proximal ends of the first protective glue and the second protective glue are non-glue surfaces.

[0012] According to some embodiments of the present invention, the cathode sheet or the anode sheet is provided with an empty foil area, and the electrode tab is welded to the empty foil area.

[0013] According to some embodiments of the present invention, the first protective adhesive completely covers the empty foil area.

[0014] According to some embodiments of the present invention, the electrode tab includes a negative electrode tab and a positive electrode tab, the negative electrode tab is connected to the anode sheet, and the positive electrode tab is connected to the cathode sheet.

[0015] The battery according to the embodiment of the second aspect of the utility model is applied with the battery cell of any of the above embodiments.

[0016] The battery according to the embodiment of the utility model has at least the following beneficial effects: the battery of this embodiment, by applying the above-mentioned battery cell, can clamp the diaphragm through the positioning structure between the first protective glue and the second protective glue, and can position and limit the diaphragm when the battery falls or the diaphragm shrinks, preventing the diaphragm from shrinking or shifting and causing OH deficiency, thereby improving the quality of the battery.

[0017] Additional aspects and advantages of the present invention will be partially given in the following description, and some of the additional aspects and advantages will become apparent from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 A schematic diagram of the structure of the first protective glue and the second protective glue in the utility model;

[0020] Figure 2 A schematic diagram of matching the first protective glue and the second protective glue in the utility model;

[0021] Figure 3 A schematic diagram of a setting of the hollow foil area of ​​the utility model;

[0022] Figure 4 The utility model is a schematic diagram of a winding structure of the battery core.

[0023] In the figure:

[0024] 100- cathode sheet, 101- positive electrode ear,

[0025] 200-diaphragm,

[0026] 300- anode sheet, 301- cathode ear,

[0027] 400-second protective glue, 401-groove,

[0028] 500-first protective adhesive, 501-protrusion, 502-first adhesive surface, 503-second adhesive surface, 504-third adhesive surface,

[0029] 600 - empty foil area. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] In the wound battery structure, the connection form of the pole ear is mainly divided into MTT structure and MTS structure. Among them, the MTT structure is to set a fake pole ear on the pole piece, and the pole ear is welded to the fake pole ear, so the pole ear does not enter the stacking area of ​​the cathode and anode sheets; the MTS structure is to clean out the empty foil area on the pole piece, and weld the pole ear to the empty foil area, so the pole ear will enter the stacking area of ​​the cathode and anode sheets. In the battery with MTS structure, the diaphragm between two adjacent pole pieces used to separate the two pole pieces is prone to insufficient OH (overhang) due to battery falling or the shrinkage of the diaphragm itself.

[0035] To this end, the utility model proposes a battery cell, which can improve the stability and position accuracy of the diaphragm and solve the problem of OH deficiency that may be caused by battery falling or diaphragm shrinkage.

[0036] Reference Figures 1 to 4As shown, a battery cell of an embodiment of the utility model includes a cathode sheet 100, an anode sheet 300, a pole ear, a first protective glue 500 and a second protective glue 400. The anode sheet 300 and the cathode sheet 100 are arranged to be stacked and wound with each other. Usually, the cathode sheet 100 and the anode sheet 300 of the battery cell are wound. During the stacking process, the cathode sheet 100 and the anode sheet 300 are stacked and wound into a winding core. The pole ear part is located between the cathode sheet 100 and the anode sheet 300, and is connected to the cathode sheet 100 or the anode sheet 300. Since the utility model is mainly for MTS structure batteries, that is, the cathode sheet 100 or the anode sheet 300 is not provided with a false pole ear, the pole ear needs to enter the area where the cathode sheet 100 and the anode sheet 300 are stacked to connect the pole sheets. The first protective glue 500 is connected to the cathode sheet 100 or the anode sheet 300 corresponding to the pole ear, and is used to cover the part of the pole ear located between the cathode sheet 100 and the anode sheet 300. It is understandable that when the tab is connected to the cathode sheet 100, the first protective glue 500 is disposed on the cathode sheet 100, and when the tab is connected to the anode sheet 300, the first protective glue 500 is disposed on the anode sheet 300, thereby covering the portion of the tab between the cathode sheet 100 and the anode sheet 300. The second protective glue 400 is connected to the other tab opposite to the first protective glue 500. It can be understood that the second protective glue 400 is provided on the electrode sheet facing the first protective glue 500, that is, when the electrode ear is connected to the cathode sheet 100, the first protective glue 500 is provided on the cathode sheet 100 and covers the electrode ear, and the second protective glue 400 is provided on the end face of the anode sheet 300 facing the first protective glue 500; when the electrode ear is connected to the anode sheet 300, the first protective glue 500 is provided on the anode sheet 300 and covers the electrode ear, and the second protective glue 400 is provided on the end face of the cathode sheet 100 facing the first protective glue 500. The diaphragm 200 is provided between the cathode sheet 100 and the anode sheet 300, and is used to separate the stacked cathode sheet 100 and the anode sheet 300. Since the first protective glue 500 and the second protective glue 400 are respectively provided on the cathode sheet 100 and the anode sheet 300, the diaphragm 200 also passes through between the first protective glue 500 and the second protective glue 400. The first protective glue 500 and the second protective glue 400 are provided with mutually matching positioning structures at their proximal ends, and the diaphragm 200 is clamped between the positioning structures.

[0037] It is understandable that the battery cell of this embodiment can be protected by the first protective glue 500 and the second protective glue 400 on the two end faces of the diaphragm 200 to prevent the diaphragm 200 from being damaged due to the connection of the tabs. At the same time, in the related prior art, when the battery with the MTS structure falls, it is easy for the diaphragm 200 to shift or shrink, resulting in insufficient battery OH, and the diaphragm 200 itself is also easy to shrink due to factors such as temperature changes, resulting in insufficient battery OH. The battery cell of this embodiment is provided with mutually matching positioning structures at the near end of the first protective glue 500 and the second protective glue 400 to clamp the diaphragm 200, which can position and limit the diaphragm 200 when the battery falls or the diaphragm 200 shrinks, alleviate the shrinkage and movement of the diaphragm 200, and even completely prevent the diaphragm 200 from shrinking and shifting to cause insufficient OH, which helps to improve the quality of the battery cell.

[0038] Reference Figure 1 and Figure 2 In some embodiments of the utility model, the positioning structure includes a protrusion 501 and a groove 401, one of which is provided at an end of the first protective glue 500 away from the pole ear, and the other is provided at an end of the second protective glue 400 close to the first protective glue 500. When the protrusion 501 is provided on the first protective glue 500, the groove 401 is provided on the second protective glue 400 corresponding to the protrusion 501; when the protrusion 501 is provided on the second protective glue 400, the groove 401 is provided on the first protective glue 500 corresponding to the protrusion 501. Since the diaphragm 200 passes between the first protective glue 500 and the second protective glue 400, when the protrusion 501 is fitted into the groove 401, the diaphragm 200 will be pressed between the two, thereby clamping the diaphragm 200. The protrusion 501 and the groove 401 match each other, that is, the shapes and sizes of the two match each other. The first protective glue 500 and the second protective glue 400 are usually made of polyester or PET+rubber system materials or materials with similar physical properties, and have soft physical properties. Therefore, when the protrusion 501 is fitted into the groove 401 to compress the diaphragm 200, the conformal matching of the protrusion 501 and the groove 401 will not cause shear damage to the diaphragm 200, and the material properties of the first protective glue 500 and the second protective glue 400 can be effectively utilized to protect the diaphragm 200.

[0039] It is understandable that a plurality of mutually matching protrusions 501 and grooves 401 may be provided between the first protective glue 500 and the second protective glue 400 to improve the clamping effect on the diaphragm 200. For example, a protrusion 501 and a groove 401 are provided at the end of the first protective glue 500 away from the tab, and a matching groove 401 and a protrusion 501 are provided at the end surface of the second protective glue 400 close to the first protective glue 500.

[0040] In some embodiments of the present invention, the first protective adhesive 500 includes a first adhesive surface 502, a second adhesive surface 503 and a third adhesive surface 504 connected in sequence along the first direction, the first adhesive surface 502 and the third adhesive surface 504 are located on both sides of the pole ear, the second adhesive surface 503 is attached to the pole ear, and the second adhesive surface 503 protrudes from the first adhesive surface 502 and the third adhesive surface 504, thereby forming a protrusion 501. Figures 1 to 3 As shown, the first direction is the width direction of the pole ear, and the first protective glue 500 is provided with a first glue surface 502, a second glue surface 503, and a third glue surface 504, that is, the pole ear is completely covered along the length direction of the pole ear, and extends to both sides of the pole ear. It can be understood that since the pole ear is connected to the end surface of the pole piece, when the first protective glue 500 is attached, the second glue surface 503 is attached to the pole ear, and it will naturally protrude from the first glue surface 502 and the third glue surface 504, so there is no need to process and set the first protective glue 500 separately, that is, the protrusion 501 in this embodiment is provided on the first protective glue 500, and the protrusion 501 is naturally formed by the first protective glue 500 being attached and covered to both sides of the pole ear. By adopting the structural setting of this embodiment, the first protective glue 500 can completely cover the connection between the pole ear and the pole piece to prevent the diaphragm 200 from being punctured by burrs and the like, and the height difference between the end faces of the pole ear and the pole piece can be used to naturally form the protrusion 501, which will not cause new difficulties in the battery production process and can improve the production quality while taking into account the production efficiency. It can be understood that the protrusion 501 in this embodiment is provided on the first protective glue 500, and the groove 401 is provided on the end of the second protective glue 400 close to the first protective glue 500.

[0041] In some embodiments of the present invention, the width of the groove 401 along the first direction is D, the width of the pole ear along the first direction is d, the thickness of the first protective glue 500 is h1, the thickness of the diaphragm 200 is h2, and the battery cell satisfies: D=d+2*h1+2*h2. In combination with the setting of the first protective glue 500 in the aforementioned embodiment, it can be seen that since the first protective glue 500 extends to both sides of the pole ear along the width direction of the pole ear, the width value of the protrusion 501 is the width value of the pole ear plus the thickness value of the first protective glue 500 on both sides. Similarly, since the diaphragm 200 is clamped between the first protective glue 500 and the second protective glue 400, if the width of the groove 401 is just equal to the width value of the protrusion 501, it is easy to apply a shear force to the diaphragm 200 during the process of the protrusion 501 being pressed into the groove 401. Although the first protective glue 500 and the second protective glue 400 have soft physical properties, it is difficult to completely avoid the diaphragm 200 from being damaged during this process. Therefore, the width of the groove 401 is further compatible with the two thickness values ​​of the diaphragm 200 based on the width of the protrusion 501, which can effectively prevent the protrusion 501 and the groove 401 from damaging the diaphragm 200 during the mutual fitting process, thereby avoiding shear damage to the diaphragm 200 and ensuring the clamping and positioning effect of the diaphragm 200.

[0042] Combined with the setting of the first protective glue 500 in the above-mentioned embodiment, the protrusion 501 is based on the end face height difference between the pole ear and the connected pole piece, and is naturally formed during the glue application process. Therefore, the protruding height of the second glue surface 503 relative to the first glue surface 502 and the third glue surface 504 is actually the protruding height of the pole ear relative to the end face of the connected pole piece, that is, the thickness of the pole ear. When the diaphragm 200 is pressed on the first protective glue 500, the protruding height of the diaphragm 200 on the second glue surface 503 relative to the diaphragm 200 on the first glue surface 502 and the third glue surface 504 on both sides is also the thickness of the pole ear. Therefore, in some embodiments of the utility model, the depth of the groove 401 is H, the thickness of the pole ear is I, and the battery cell satisfies: H=I. With the structural setting of this embodiment, the depth of the groove 401 is controlled to be consistent with the thickness of the pole ear, which can just accommodate the protrusion 501 and cooperate with the protrusion 501 to press the diaphragm 200.

[0043] In some embodiments of the present invention, the first protective glue 500 and the second protective glue 400 are respectively bonded to the near ends of the cathode sheet 100 and the anode sheet 300. When the tab is a positive tab 101, that is, the tab is connected to the cathode sheet 100, the first protective glue 500 is correspondingly arranged on the cathode sheet 100, and the second protective glue 400 is correspondingly arranged on the opposite anode sheet 300; when the tab is a negative tab 301, that is, the tab is connected to the anode sheet 300, the first protective glue 500 is correspondingly arranged on the anode sheet 300, and the second protective glue 400 is correspondingly arranged on the opposite cathode sheet 100. The near ends of the first protective glue 500 and the second protective glue 400 are non-adhesive surfaces. Since the first protective glue 500 and the second protective glue 400 are attached to the electrode, in this embodiment, the near ends of the first protective glue 500 and the second protective glue 400 are set as non-glue surfaces, that is, the near ends of the first protective glue 500 and the second protective glue 400 do not have an adhesive layer, so that the diaphragm 200 will not be adhered and wrinkled when passing through, which is beneficial to ensure the production quality of the diaphragm 200.

[0044] Reference Figure 3 In some embodiments of the present invention, the cathode sheet 100 or the anode sheet 300 is provided with an empty foil area 600, and the tab is welded to the empty foil area 600. Specifically, when the tab is a negative tab 301, an empty foil area 600 is provided on the anode sheet 300, and the tab is welded to the empty foil area 600. Conversely, when the tab is a positive tab 101, an empty foil area 600 is provided on the cathode sheet 100, and the tab is welded to the empty foil area 600. It can be understood that both the cathode sheet 100 and the anode sheet 300 include a substrate and an active material layer coated on the surface of the substrate, and the empty foil area 600 can be formed by laser cleaning the active material layer on the surface of the substrate.

[0045] Continue to refer to Figure 3 In order to ensure the welding effect of the pole ear, the size of the empty foil area 600 is larger than the size of the pole ear, so as to ensure that the pole ear is completely welded to the substrate of the pole piece. Correspondingly, in some embodiments of the utility model, the first protective glue 500 completely covers the empty foil area 600. The structural setting of this embodiment can ensure that the first protective glue 500 protects the diaphragm 200.

[0046] In some embodiments of the present invention, the battery cell is provided with a negative electrode ear 301 and a positive electrode ear 101, wherein the negative electrode ear 301 is connected to the anode sheet 300, and the positive electrode ear 101 is connected to the cathode sheet 100. The anode sheet 300 is laser cleaned to remove an empty foil area 600 in the area set for connecting the negative electrode ear 301, and then the negative electrode ear 301 is welded. The cathode sheet 100 is laser cleaned to remove an empty foil area 600 in the area set for connecting the positive electrode ear 101, and then the positive electrode ear 101 is welded.

[0047] In some embodiments, the battery cell is provided with a cathode sheet 100 and an anode sheet 300, the cathode sheet 100 and the anode sheet 300 are stacked and wound, a separator 200 is arranged between the cathode sheet 100 and the anode sheet 300, and a separator 200 is also arranged at one end of the anode sheet 300 away from the cathode sheet 100, and the two separators 200 are stacked and wound together with the cathode sheet 100 and the anode sheet 300, so that in any winding section, there is a separator 200 between two adjacent electrode sheets. Among them, the cathode sheet 100 is provided with an empty foil area 600 at the middle position of its own winding length, and the empty foil area 600 is located at one end face of the cathode sheet 100, and a positive electrode ear 101 is welded to the empty foil area 600. The anode sheet 300 is provided with an empty foil area 600 at the middle position of its own winding length, and the empty foil area 600 is located at one end face of the anode sheet 300, and a negative electrode ear 301 is welded to the empty foil area 600. A distance is maintained between the positive electrode tab 101 and the negative electrode tab 301 .

[0048] For the negative electrode ear 301, a first protective glue 500 covering the empty foil area 600 is attached to the anode sheet 300, and the first protective glue 500 forms a protrusion 501 by covering the negative electrode ear 301. A second protective glue 400 is attached to the cathode sheet 100 facing the first protective glue 500, and the second protective glue 400 is provided with a groove 401 corresponding to the protrusion 501 of the first protective glue 500.

[0049] For the positive electrode ear 101, a first protective glue 500 covering the empty foil area 600 is attached to the cathode sheet 100, and the first protective glue 500 forms a protrusion 501 by covering the positive electrode ear 101. A second protective glue 400 is attached to the anode sheet 300 facing the first protective glue 500, and the second protective glue 400 is provided with a groove 401 corresponding to the protrusion 501 of the first protective glue 500.

[0050] With the structural setting of this embodiment, the diaphragm 200 between the two pole pieces has a pair of protective glue for matching and clamping, which can effectively prevent the diaphragm 200 from being offset due to the battery falling, and prevent the diaphragm 200 from shrinking due to factors such as temperature changes, thereby effectively ensuring the battery OH amount.

[0051] The utility model further proposes a battery, which is applied with the battery cell of any of the above embodiments. It is understandable that the battery of this embodiment can clamp the diaphragm 200 through the positioning structure between the first protective glue 500 and the second protective glue 400 by applying the above battery cell, and can position and limit the diaphragm 200 when the battery falls or the diaphragm 200 shrinks, so as to prevent the diaphragm 200 from shrinking and shifting to cause OH deficiency, thereby improving the quality of the battery.

[0052] Reference Figures 1 to 4A battery of this embodiment includes a wound cell. The wound cell is made by stacking a cathode sheet 100, a separator 200, an anode sheet 300, and a separator 200 and winding them into a core. Both the cathode sheet 100 and the anode sheet 300 are structural forms made of a substrate coated with an active material layer. A negative electrode ear 301 is arranged at the middle layer position of the winding of the anode sheet 300, and a positive electrode ear 101 is arranged at the middle layer position of the winding of the cathode sheet 100, and the negative electrode ear 301 and the positive electrode ear 101 are kept staggered left and right, or distributed at both ends of the wound cell. Among them, the anode sheet 300 and the cathode sheet 100 are respectively provided with an empty foil area 600 corresponding to the negative electrode ear 301 and the positive electrode ear 101, and the negative electrode ear 301 and the positive electrode ear 101 correspond to the empty foil area 600 welded on the anode sheet 300 and the cathode sheet 100. The empty foil area 600 is the substrate area exposed by laser cleaning of the active material layer. The wound cell is provided with a first protective glue 500 for the positive pole ear 101 and the negative pole ear 301, respectively. The first protective glue 500 completely covers the empty foil area 600 along the length direction of the pole ear and also completely covers the empty foil area 600 along the winding direction. The first protective glue 500 extends on both sides of the pole ear along the winding direction, and forms a protrusion 501 based on the protruding height of the pole ear relative to the pole piece. The wound cell is provided with a second protective glue 400 on the other pole piece directly opposite to the first protective glue 500, and the second protective glue 400 is provided with a groove 401 corresponding to the protrusion 501. Among them, the width of the groove 401 along the winding direction is D, the width of the pole ear along the winding direction is d, the thickness of the first protective glue 500 is h1, the thickness of the separator 200 is h2, the depth of the groove 401 is H, the thickness of the pole ear is I, and the cell satisfies: D = d + 2*h1 + 2*h2, and H = I. Furthermore, along the winding direction, the length of the first protective glue 500 is the same as that of the second protective glue 400 , and along the width direction of the wound battery cell, the length of the first protective glue 500 is also the same as that of the second protective glue 400 .

[0053] In the battery of this embodiment, the first protective glue 500 and the second protective glue 400 are provided for the positive electrode ear 101 and the negative electrode ear 301, so as to prevent the diaphragm 200 from being damaged and protect the electrode ears at the same time. On this basis, the protrusion 501 and the groove 401 are further provided to clamp the diaphragm 200, prevent the diaphragm 200 from shrinking and shifting to cause OH deficiency, and help improve the quality of the battery.

[0054] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A battery cell, characterized in that: include: Cathode sheet; An anode sheet, stacked and wound with the cathode sheet; A tab, partly disposed between the cathode sheet and the anode sheet, and connected to the cathode sheet or the anode sheet; A first protective glue connected to the cathode sheet or the anode sheet and covering a portion of the electrode tab located between the cathode sheet and the anode sheet; A second protective adhesive, connected to another pole piece opposite to the first protective adhesive; A separator, stacked and wound between the cathode sheet and the anode sheet, for separating the cathode sheet and the anode sheet; Wherein, the proximal ends of the first protective glue and the second protective glue are provided with mutually matching positioning structures, and the diaphragm is clamped between the positioning structures.

2. The battery cell according to claim 1, characterized in that: The positioning structure includes a protrusion and a groove, one of which is arranged at an end of the first protective glue away from the tab, and the other is arranged at an end of the second protective glue close to the first protective glue.

3. The battery cell according to claim 2, characterized in that: The first protective adhesive includes a first adhesive surface, a second adhesive surface and a third adhesive surface connected in sequence along a first direction, the first adhesive surface and the third adhesive surface are located on both sides of the pole ear, the second adhesive surface is attached to the pole ear, and the second adhesive surface protrudes from the first adhesive surface and the third adhesive surface, thereby forming the protrusion.

4. The battery cell according to claim 2, characterized in that: The width of the groove along the first direction is D, the width of the tab along the first direction is d, the thickness of the first protective glue is h1, the thickness of the diaphragm is h2, and the battery cell satisfies: D=d+2*h1+2*h2.

5. The battery cell according to claim 2, characterized in that: The depth of the groove is H, the thickness of the tab is I, and the battery cell satisfies: H=I.

6. The battery cell according to claim 1, characterized in that: The first protective glue and the second protective glue are respectively bonded to the proximal ends of the cathode sheet and the anode sheet, and the proximal ends of the first protective glue and the second protective glue are non-glue surfaces.

7. The battery cell according to claim 1, characterized in that: The cathode sheet or the anode sheet is provided with an empty foil area, and the electrode tab is welded to the empty foil area.

8. The battery cell according to claim 7, characterized in that: The first protective glue completely covers the empty foil area.

9. The battery cell according to claim 1, characterized in that: The electrode tabs include a negative electrode tab and a positive electrode tab, wherein the negative electrode tab is connected to the anode sheet, and the positive electrode tab is connected to the cathode sheet.

10. A battery, characterized in that: The battery cell according to any one of claims 1 to 9 is used.

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