Electrode, cell and battery

Abstract

The utility model discloses a pole piece, comprising: a current collector; an active material layer, coated on the current collector, and a glue groove for pasting adhesive tape is provided on one side of the active material layer away from the current collector; wherein, a foil-exposed area is provided on the bottom wall of the glue groove, and the foil-exposed area exposes part of the current collector for adhesive tape to adhere; or, a reinforcement layer for reinforcing the active material is provided on the bottom wall of the glue groove for adhesive tape to adhere. In the pole piece of the utility model, a foil-exposed area is provided on the bottom wall of the glue groove, and the adhesive tape not only adheres to the active material, but also adheres to the part of the current collector exposed by the foil-exposed area; or, a reinforcement layer is provided on the bottom wall of the glue groove, and the reinforcement layer reinforces the active material on the bottom wall of the glue groove, so that the active materials on the bottom wall of the glue groove are tightly together and not easy to fall off, and the adhesive tape is bonded to the reinforcement layer, which can prevent the adhesive tape from falling with the falling of the active material in the glue groove, thereby improving the adhesive stability of the adhesive tape and making it not easy to fall off.

Description

Technical Field

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

[0002] Lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in the electrochemical system. In recent years, lithium batteries have been widely used in digital products and other fields due to their many advantages such as long cycle life, good safety performance, and rapid charging and discharging.

[0003] Lithium batteries are usually made by using winding or lamination equipment to assemble positive pole pieces, negative pole pieces and diaphragms to form a battery cell, and then encapsulating the battery cell in a shell. Among them, after the pole piece is wound, the burrs on its pole ear may pierce the diaphragm and directly contact the active material of the other pole piece with opposite polarity, resulting in a short circuit due to the connection between the positive and negative poles. Therefore, tape is generally pasted at the position corresponding to the pole ear of the other pole piece with opposite polarity to provide barrier protection.

[0004] At present, the adhesive tape on the electrode is usually laser cleaned to thin it, and then the adhesive tape is pasted on the thinned area. However, the materials in the thinned area after laser cleaning are loose and easy to fall off, which makes the adhesive tape fall off with the materials, affecting the normal use of the battery. Utility Model Content

[0005] The main purpose of the utility model is to provide a pole piece, aiming to solve the technical problem that the adhesive tape used for blocking the burrs of the pole ear on the pole piece is easy to fall off.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a pole piece, which comprises:

[0007] current collector;

[0008] An active material layer is coated on the current collector, and a glue sticking groove for sticking adhesive tape is provided on a side of the active material layer away from the current collector;

[0009] The bottom wall of the glue-applying groove is provided with a foil-exposed area, and the foil-exposed area exposes part of the current collector for adhesive tape bonding; or the bottom wall of the glue-applying groove is provided with a reinforcement layer for reinforcing the active material for adhesive tape bonding.

[0010] In some embodiments, the foil exposed area is disposed adjacent to one side wall of the adhesive pasting groove, and is spaced apart from the other side wall of the adhesive pasting groove; or,

[0011] The foil exposed area is spaced apart from the two side walls of the glue sticking groove.

[0012] In some embodiments, the exposed foil area is provided in plurality;

[0013] The plurality of exposed foil areas are sequentially arranged at intervals along the length direction of the current collector; or, the plurality of exposed foil areas are sequentially arranged at intervals along the width direction of the current collector.

[0014] In some embodiments, when the bottom wall of the glue groove is provided with the reinforcement layer, the bottom wall of the glue groove is provided with a recessed area, and the side of the reinforcement layer facing the bottom wall of the glue groove is provided with a raised portion adapted to the recessed area, and the raised portion is embedded in the recessed area.

[0015] In some embodiments, a plurality of the recessed areas are provided, and the plurality of recessed areas are sequentially spaced apart and distributed along the length direction of the current collector.

[0016] In some embodiments, the recessed area is disposed through the bottom wall of the adhesive groove, so that the current collector is partially exposed and connected to the protruding portion.

[0017] In some embodiments, the reinforcement layer includes an insulating adhesive layer.

[0018] In some embodiments, the pole piece further includes adhesive tape, and the adhesive tape is affixed to the adhesive groove.

[0019] The utility model also provides a battery cell, which comprises a positive electrode sheet, a negative electrode sheet and a diaphragm, wherein the diaphragm is located between the positive electrode sheet and the negative electrode sheet;

[0020] Wherein, the positive electrode plate includes the aforementioned electrode plate; and / or, the negative electrode plate includes the aforementioned electrode plate.

[0021] The utility model also provides a battery, which comprises a shell and a battery core arranged in the shell, and the battery core is the battery core as described above.

[0022] When the pole piece of the utility model is used in practice, adhesive paper is pasted in the adhesive groove of the active material layer on the current collector, wherein the bottom wall of the adhesive groove is provided with a leakage foil area, and the adhesive paper is not only bonded to the active material on the bottom wall of the adhesive groove, but also forms adhesion with the current collector part exposed by the leakage foil area, which can prevent the adhesive paper from falling with the falling of the active material in the adhesive groove, thereby improving the bonding stability of the adhesive paper and preventing it from falling off; or, the bottom wall of the adhesive groove is provided with a reinforcement layer, and the reinforcement layer reinforces the active material on the bottom wall of the adhesive groove, so that the active materials on the bottom wall of the adhesive groove are tightly connected and not easy to fall off, and the adhesive paper is bonded to the reinforcement layer, which can prevent the adhesive paper from falling with the falling of the active material in the adhesive groove, thereby improving the bonding stability of the adhesive paper and preventing it from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a structural schematic diagram of a pole piece in the prior art;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the middle pole piece from another perspective;

[0025] Figure 3 This is a schematic diagram of the structure of a pole piece in one embodiment of the utility model;

[0026] Figure 4 for Figure 3 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0027] Figure 5 for Figure 3 A schematic diagram of the structure in which the electrode is affixed with adhesive tape in the embodiment;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0029] Figure 7 This is a schematic diagram of the structure of a pole piece in another embodiment of the utility model;

[0030] Figure 8 for Figure 7 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0031] Fig. 9 for Figure 7 A schematic diagram of the structure in which the electrode is affixed with adhesive tape in the embodiment;

[0032] Fig.10 for Fig. 9 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0033] Fig.11 This is a schematic diagram of the structure of a pole piece in another embodiment of the utility model;

[0034] Fig.12 for Fig.11 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0035] Fig.13 for Fig.11 A schematic diagram of the structure in which the electrode is affixed with adhesive tape in the embodiment;

[0036] Fig.14 This is a schematic diagram of the structure of a pole piece in yet another embodiment of the utility model;

[0037] Fig.15 This is a schematic diagram of the structure of a pole piece in yet another embodiment of the utility model;

[0038] Fig.16 for Fig.15 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0039] Fig.17 for Fig.15 A schematic diagram of the structure in which the electrode is affixed with adhesive tape in the embodiment;

[0040] Fig.18 for Fig.17 A schematic diagram of the structure of the pole piece in the embodiment at another viewing angle;

[0041] Fig.19 This is a schematic diagram of the structure of a pole piece in yet another embodiment of the utility model;

[0042] Fig. 20 This is a schematic diagram of the structure of a pole piece in yet another embodiment of the utility model;

[0043] Fig.21 This is a schematic diagram of the structure of a pole piece in yet another embodiment of the utility model;

[0044] Description of Figure Numbers:

[0045] Label name Label name 100 current collector L Foil Area 200 Active material layer 400 Reinforcement layer 300 Adhesive tape A Depression area T Glue slot 410 Raised part

[0046] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0050] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0051] After the electrode is wound, the burrs on the pole ear may pierce the diaphragm and directly contact the active material of the other pole with opposite polarity, thus causing a short circuit due to the connection between the positive and negative electrodes. Therefore, adhesive tape is usually pasted on the position corresponding to the pole ear of the other pole with opposite polarity to provide isolation and protection. Figure 1 and Figure 2 As shown, the glue position on the electrode for applying the adhesive tape is usually cleaned by laser to form a glue groove T, and then the adhesive tape is applied in the glue groove T. However, after laser cleaning, the materials in the glue groove T are relatively loose and easy to fall off, which causes the adhesive tape to fall off with the falling of the materials, affecting the normal use of the battery.

[0052] Based on the technical problems existing in the related prior art mentioned above, the embodiment of the utility model proposes a pole piece, which can improve the bonding stability of the adhesive tape, making it difficult to fall off, and ensuring the normal use of the battery. Figures 3 to 21 The electrode sheet includes: a current collector 100 and an active material layer 200, the active material layer 200 is coated on the current collector 100, and a glue groove T for sticking adhesive tape 300 is provided on the side of the active material layer 200 away from the current collector 100; wherein, a foil exposed area L is provided on the bottom wall of the glue groove T, and the foil exposed area L exposes part of the current collector 100 for bonding with the adhesive tape 300; or, a reinforcement layer 400 for reinforcing the active material is provided on the bottom wall of the glue groove T for bonding with the adhesive tape 300.

[0053] The pole piece involved in this embodiment can be a positive pole piece (or cathode pole piece) or a negative pole piece (or anode pole piece), and there is no limitation on this. The pole piece includes a current collector 100 and an active material layer 200, wherein the active material layer 200 is coated on the current collector 100. When the pole piece is a positive pole piece, the current collector 100 can be made of aluminum foil, and the active material layer 200 can be made of a positive electrode active coating material, such as lithium cobalt oxide, etc.; when the pole piece is a negative pole piece, the current collector 100 can be made of copper foil, and the active material layer 200 can be made of a negative electrode active material, such as graphite, etc.

[0054] Specifically, a glue groove T is provided on the current collector 100, and the glue groove T is located on the side of the active material layer 200 away from the current collector 100. The set glue groove T is pre-set for the position of the pole ear on the other pole piece with the opposite polarity to the pole piece in the corresponding battery cell, and correspondingly, the glue groove T is located on one side edge of the pole piece. The glue groove T is used to paste the adhesive tape 300, and the adhesive tape 300 is pasted in the glue groove T to block the pole ear on the other pole piece with the opposite polarity to the pole piece in the battery cell, thereby preventing it from directly contacting the active material of the pole piece, and avoiding the occurrence of a short circuit. The number of glue grooves T can be set according to actual conditions. For example, there are two glue grooves T, and each glue groove T is set corresponding to the position of a pole ear. This is only exemplary and not restrictive. Among them, the glue groove T can be a square groove. Optionally, the length of the glue groove T is greater than or equal to 24mm, and the width of the glue groove T is greater than or equal to 11mm.

[0055] Furthermore, in this embodiment, if Figures 3 to 6 As shown, the bottom wall of the adhesive groove T may be provided with an exposed foil area L, and the exposed foil area L partially exposes the current collector 100. When the adhesive tape 300 is pasted in the adhesive groove T, the adhesive tape 300 not only adheres to the active material on the bottom wall of the adhesive groove T, but also forms an adhesive with the portion of the current collector 100 exposed by the exposed foil area L, which can prevent the adhesive tape 300 from falling with the falling of the active material in the adhesive groove T, thereby improving the bonding stability of the adhesive tape 300 and making it difficult to fall off. Among them, the adhesive groove T and the exposed foil area L can be formed by laser cleaning the active material layer 200. It is easy to understand that when performing laser cleaning, different laser cleaning parameters can be set to achieve different specifications of thinning thickness on the active material layer 200, and then the adhesive groove T and the exposed foil area L located on the bottom wall of the adhesive groove T are cleaned on the active material layer 200. Among them, the area and number of the exposed foil area L can be set according to actual conditions, and this embodiment is not limited to this.

[0056] In addition, if Figures 15 to 18 As shown, the bottom wall of the adhesive groove T may also be provided with a reinforcement layer 400, and the reinforcement layer 400 reinforces the active material on the bottom wall of the adhesive groove T, so that the active material on the bottom wall of the adhesive groove T is tightly and tightly connected and not easy to fall off, and the adhesive tape 300 is bonded to the reinforcement layer 400, which can prevent the adhesive tape 300 from falling with the falling of the active material in the adhesive groove T, thereby improving the bonding stability of the adhesive tape 300 and making it not easy to fall off. Among them, the material of the reinforcement layer 400 can be various, such as glue materials. In addition, when the reinforcement layer 400 is provided on the bottom wall of the adhesive groove T, it is also connected to each side wall of the adhesive groove T (such as bonding), and is not easy to detach from the adhesive groove T, which can ensure the degree of reinforcement of the active material on the bottom wall of the adhesive groove T.

[0057] In some embodiments, reference Figures 3 to 10, the exposed foil area L is connected to one side wall of the adhesive groove T, and is spaced apart from the other side wall of the adhesive groove T; or,

[0058] The exposed foil area L is spaced apart from the two side walls of the glue-applying groove T.

[0059] In this embodiment, there are two types of arrangement of the exposed foil area L on the bottom wall of the adhesive laminating groove T. The first type is as follows: Figure 7 and Figure 8 As shown, the exposed foil area L of the bottom wall of the glue-applying groove T is adjacent to and connected to one side wall of the glue-applying groove T, and is at the same time away from the other side wall of the glue-applying groove T. Correspondingly, as Fig. 9 As shown, when the adhesive tape 300 is pasted in the adhesive slot T, one side area of ​​the adhesive tape 300 is bonded to the exposed foil area L. Figure 3 and Figure 4 As shown, the exposed foil area L of the bottom wall of the adhesive groove T is not adjacent to the two side walls of the adhesive groove T, but is spaced apart from the two. Figure 5 As shown, when the adhesive tape 300 is pasted in the adhesive slot T, the middle area of ​​the adhesive tape 300 is bonded to the exposed foil area L. In practical application, the exposed foil area L on the bottom wall of the adhesive slot T can be arranged in any of the above-mentioned arrangements.

[0060] In some embodiments, reference Figures 11 to 14 , a plurality of exposed foil areas L are provided;

[0061] The plurality of exposed foil areas L are sequentially arranged at intervals along the length direction of the current collector 100 ; or, the plurality of exposed foil areas L are sequentially arranged at intervals along the width direction of the current collector 100 .

[0062] In this embodiment, a plurality of exposed foil areas L are provided, and the area sizes of the plurality of exposed foil areas L may be the same or different, and there is no limitation on this. There are two arrangements of the plurality of exposed foil areas L. In the first arrangement, the plurality of exposed foil areas L are arranged in sequence along the length direction of the current collector 100, for example, Fig.11 As shown, there are five exposed foil areas L, and the length direction of the current collector 100 is used as a reference direction, and the five exposed foil areas L are arranged in sequence. Further, when the multiple exposed foil areas L are distributed one by one in the length direction of the current collector 100, the exposed foil areas L are extended along the width direction of the current collector 100. The second type is that the multiple exposed foil areas L are arranged in sequence along the width direction of the current collector 100, for example, Fig.14As shown, there are four exposed foil areas L, and the length direction of the current collector 100 is used as a reference direction, and the four exposed foil areas L are arranged in sequence. Further, when multiple exposed foil areas L are distributed in the width direction of the current collector 100, the exposed foil areas L are extended along the length direction of the current collector 100. Among them, the spacing distance between any two adjacent exposed foil areas L can be the same or different, and can be set according to actual conditions. In actual application, when the adhesive tape 300 is pasted in the adhesive groove T, it forms adhesion with the corresponding multiple exposed foil areas L, thereby realizing multi-region and multi-position adhesion, which can further improve the adhesion stability of the adhesive tape 300.

[0063] In some embodiments, reference Fig.19 When the bottom wall of the glue groove T is provided with a reinforcement layer 400, a recessed area A is provided on the bottom wall of the glue groove T, and a protrusion 410 adapted to the recessed area A is provided on one side of the reinforcement layer 400 facing the bottom wall of the glue groove T, and the protrusion 410 is embedded in the recessed area A.

[0064] In this embodiment, when the reinforcement layer 400 is arranged on the bottom wall of the glue groove T, the raised portion 410 of the reinforcement layer 400 corresponds to the recessed area A embedded in the bottom wall of the glue groove T to form a concave-convex fit, so that the reinforcement layer 400 and the bottom wall of the glue groove T are more closely fitted, ensuring the degree of reinforcement of the active material of the bottom wall of the glue groove T by the reinforcement layer 400. Optionally, the recessed area A can be formed by laser cleaning the active material layer 200. It is easy to understand that when performing laser cleaning, different laser cleaning parameters can be set to achieve different specifications of thinning thickness on the active material layer 200, and then the glue groove T and the recessed area A located on the bottom wall of the glue groove T are cleaned on the active material layer 200. Among them, the area and number of the recessed area A can be set according to actual conditions, and this embodiment does not limit this.

[0065] In some embodiments, reference Fig. 20 , there are multiple recessed areas A, and the multiple recessed areas A are sequentially spaced and distributed along the length direction of the current collector 100. In this embodiment, there are multiple recessed areas A, and the area sizes of the multiple recessed areas A can be the same or different, and there is no limitation on this. The multiple recessed areas A are sequentially spaced and arranged along the length direction of the current collector 100, for example, Fig. 20As shown, there are three recessed areas A, and the length direction of the current collector 100 is used as a reference direction, and the three recessed areas A are arranged in sequence. Further, when multiple recessed areas A are distributed one by one in the length direction of the current collector 100, the recessed areas A are extended along the width direction of the current collector 100. In actual application, the reinforcement layer 400 is provided with multiple protrusions 410. When the reinforcement layer 400 is arranged on the bottom wall of the adhesive groove T, the multiple protrusions 410 thereof are correspondingly embedded with the multiple recessed areas A, thereby realizing multi-region and multi-position connection with the bottom wall of the adhesive groove T, which can further improve the stability of the reinforcement layer 400, and thereby improve the degree of reinforcement of the active material on the bottom wall of the adhesive groove T.

[0066] In some embodiments, reference Fig.21 , the recessed area A is set through the bottom wall of the adhesive groove T so that the current collector 100 is partially exposed and connected to the raised portion 410. In this embodiment, the recessed area A is set through the bottom wall of the adhesive groove T so that the current collector 100 is partially exposed. When the reinforcement layer 400 is set on the bottom wall of the adhesive groove T, the raised portion 410 of the reinforcement layer 400 corresponds to the recessed area A embedded in the bottom wall of the adhesive groove T and is connected to the raised portion 410. The reinforcement layer 400 is connected to the current collector 100 through its raised portion 410, and is not easy to loosen from the adhesive groove T, which can improve the stability of the setting, thereby improving the degree of reinforcement of the active material on the bottom wall of the adhesive groove T.

[0067] In some embodiments, the reinforcement layer 400 includes an insulating adhesive layer. In this embodiment, an insulating adhesive liquid may be poured into the entire area of ​​the bottom wall of the adhesive groove T to solidify to form an insulating adhesive layer, and the insulating adhesive layer adheres the active substances on the bottom wall of the adhesive groove T to each other, so that the active substances are not easy to loosen. In addition, the insulating adhesive layer can also perform insulation barrier. Even if the burr of the pole ear pierces the adhesive tape 300, it will be blocked by the insulating adhesive layer and cannot directly contact the active substance of the pole piece, which can avoid the occurrence of a short circuit.

[0068] In some embodiments, reference Figure 5 and Figure 6 The electrode sheet further includes adhesive tape 300, which is pasted in the adhesive groove T. In this embodiment, the adhesive tape 300 is pasted in the adhesive groove T to block the electrode ear on the other electrode sheet with opposite polarity to the electrode sheet in the battery cell, thereby preventing it from directly contacting the active material of the electrode sheet, thereby avoiding a short circuit.

[0069] The embodiment of the utility model also proposes a battery cell, which includes a positive electrode sheet, a negative electrode sheet and a separator, and the separator is located between the positive electrode sheet and the negative electrode sheet; wherein the positive electrode sheet includes the electrode sheet as recorded in the above embodiment; and / or the negative electrode sheet includes the electrode sheet as recorded in the above embodiment.

[0070] The specific structure of the pole piece refers to the above-mentioned embodiment. Since the present battery cell adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0071] The utility model also provides a battery, which includes a housing and a battery cell disposed in the housing, and the battery cell is the battery cell described in the above embodiment. The specific structure of the battery cell refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0072] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A pole piece, characterized in that: include: current collector; An active material layer is coated on the current collector, and a glue sticking groove for sticking adhesive tape is provided on a side of the active material layer away from the current collector; The bottom wall of the glue-applying groove is provided with a foil-exposed area, and the foil-exposed area exposes part of the current collector for adhesive tape bonding; or the bottom wall of the glue-applying groove is provided with a reinforcement layer for reinforcing the active material for adhesive tape bonding.

2. The pole piece according to claim 1, characterized in that: The foil exposed area is disposed in contact with one side wall of the adhesive application groove and is spaced apart from the other side wall of the adhesive application groove; or, The foil exposed area is spaced apart from the two side walls of the glue sticking groove.

3. The pole piece according to claim 1, characterized in that: The exposed foil area is provided with a plurality of areas; The plurality of exposed foil areas are sequentially arranged at intervals along the length direction of the current collector; or, the plurality of exposed foil areas are sequentially arranged at intervals along the width direction of the current collector.

4. The pole piece according to claim 1, characterized in that: When the bottom wall of the glue groove is provided with the reinforcement layer, the bottom wall of the glue groove is provided with a recessed area, and a protrusion matched with the recessed area is provided on one side of the reinforcement layer facing the bottom wall of the glue groove, and the protrusion is embedded in the recessed area.

5. The pole piece according to claim 4, characterized in that: A plurality of the recessed areas are provided, and the plurality of recessed areas are sequentially spaced and distributed along the length direction of the current collector.

6. The pole piece according to claim 4, characterized in that: The recessed area is arranged to penetrate the bottom wall of the glue-applying groove, so that the current collector is partially exposed and connected to the protruding portion.

7. The pole piece according to any one of claims 1, 4 to 6, characterized in that: The reinforcement layer includes an insulating adhesive layer.

8. The pole piece according to claim 1, characterized in that: It also includes adhesive tape, which is attached to the adhesive groove.

9. A battery cell, characterized in that: It includes a positive electrode sheet, a negative electrode sheet and a separator, wherein the separator is located between the positive electrode sheet and the negative electrode sheet; Wherein, the positive electrode plate includes the plate as described in any one of claims 1-8; and / or, the negative electrode plate includes the plate as described in any one of claims 1-8.

10. A battery, characterized in that: The invention comprises a shell and a battery cell arranged in the shell, wherein the battery cell is the battery cell as claimed in claim 9.

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