Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery, and belongs to the technical field of new energy. The battery cell comprises a positive plate, a negative plate and an insulating adhesive layer, the positive plate and the negative plate are wound or laminated to form the battery cell, at the end part of the battery cell, the negative plate extends out relative to the positive plate, the part, extending out relative to the positive plate, of the negative plate is set as an external suspension part, and a first gap is defined by the adjacent external suspension parts; the insulating rubber layer is located at the end part of the battery cell, the insulating rubber layer comprises a first insulating part connected with the positive plate and a second insulating part connected with the negative plate, the first insulating part is located in the first gap and is respectively propped against the external suspension parts at the two sides, and the insulating rubber layer is arranged to wrap the end part of the battery cell, so that the condition of short circuit caused by puncturing the diaphragm by burrs is avoided. Besides, the first insulating part is respectively abutted against the external suspension parts on the two sides, so that the external suspension parts of the negative plate are supported, and the problem of deformation of the external suspension parts in the production or use process is solved.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a battery cell and battery. Background Technology

[0002] In existing lithium-ion battery manufacturing technology, electrode cutting is usually carried out using metal dies or laser cutting. Due to the wear of the die or the fluctuation of laser power during the production process, metal burrs are prone to appear on the current collector at the edge of the electrode. When the metal burrs are too large, they can puncture the separator. If the metal burrs come into contact with the electrode of the other polarity, it will cause a short circuit between the positive and negative electrodes, which will seriously affect the safety of the cell. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell that avoids short circuits caused by burrs puncturing the separator by providing an insulating adhesive layer to wrap the ends of the battery cell.

[0004] This utility model also proposes a battery having the above-mentioned battery cell.

[0005] The battery cell according to a first aspect embodiment of the present invention includes a positive electrode plate, a negative electrode plate, and an insulating adhesive layer, wherein:

[0006] The positive electrode and the negative electrode are wound or stacked to form the battery cell. At the edge of the battery cell, the negative electrode extends outward relative to the positive electrode. The portion of the negative electrode that extends outward relative to the positive electrode is defined as an overhang. Adjacent overhangs define a first gap.

[0007] The insulating adhesive layer is located at the end of the battery cell. The insulating adhesive layer includes a first insulating member connected to the positive electrode plate and a second insulating member connected to the negative electrode plate. The first insulating member is located in the first gap and abuts against the outer overhangs on both sides.

[0008] The battery cell according to the embodiments of this utility model has at least the following beneficial effects:

[0009] By placing a first insulating element along the edge of the positive electrode and a second insulating element along the edge of the negative electrode, the edges of the positive and negative electrodes are effectively wrapped by these two elements. Even if burrs exist along the edges of the electrodes, they are covered by the insulating elements, preventing burrs from puncturing the separator and causing a short circuit. Furthermore, the first insulating element abuts against the outer suspension portions on both sides, providing support for the outer suspension portion of the negative electrode. This improves the problem of deformation of the outer suspension portion during production or use, reduces the battery failure rate, and increases battery life.

[0010] According to some embodiments of the present invention, the edge of the positive electrode sheet is provided with a first blank area where no active material is coated, and the first insulating member is disposed in the first blank area; and / or, the edge of the negative electrode sheet is provided with a second blank area where no active material is coated, and the second insulating member is disposed in the second blank area.

[0011] According to some embodiments of the present invention, the positive electrode includes a first current collector and a first active layer coated on both sides of the first current collector. The first insulating member includes a first connecting portion and a second connecting portion located on both sides of the first current collector, and a third connecting portion connected to the first connecting portion and the second connecting portion. The first connecting portion is connected to the first active layer on one side, and the second connecting portion is connected to the first active layer on the other side.

[0012] And / or, the negative electrode includes a second current collector and a second active layer coated on both sides of the second current collector, the second insulating member includes a fourth connecting portion and a fifth connecting portion located on both sides of the second current collector, and a sixth connecting portion connected to the fourth connecting portion and the fifth connecting portion, the fourth connecting portion being connected to the second active layer on one side, and the fifth connecting portion being connected to the second active layer on the other side.

[0013] According to some embodiments of the present invention, along the direction in which the negative electrode extends from the positive electrode, the size of the first insulating member is larger than the size of the second insulating member.

[0014] According to some embodiments of the present invention, along the direction in which the negative electrode extends from the positive electrode, the size of the first insulating member is greater than or equal to the size of the first gap.

[0015] According to some embodiments of the present invention, the battery cell further includes a separator, wherein any positive electrode sheet and the adjacent negative electrode sheet are separated by the separator, and the separator extends outward relative to the negative electrode sheet at the edge of the battery cell.

[0016] Wherein, two separators adjacent to any of the positive electrode plates are connected by the first insulating member, and / or, two separators adjacent to any of the negative electrode plates are connected by the second insulating member.

[0017] According to some embodiments of the present invention, along the direction in which the negative electrode extends from the positive electrode, the diaphragm extends relative to the second insulating member, and the distance from the edge of the second insulating member to the edge of the diaphragm is not less than 0.5 mm.

[0018] According to some embodiments of the present invention, along the direction in which the negative electrode extends from the positive electrode, the second insulating member extends relative to the first insulating member, and the distance from the edge of the second insulating member to the edge of the first insulating member is not greater than 1 mm.

[0019] According to some embodiments of the present invention, the thickness of the positive electrode sheet is not less than the thickness of the first insulating member, and the difference between the thickness of the positive electrode sheet and the thickness of the first insulating member is not greater than 0.01 mm.

[0020] And / or, the thickness of the negative electrode sheet is not less than the thickness of the second insulating member, and the difference between the thickness of the negative electrode sheet and the thickness of the second insulating member is not greater than 0.01 mm.

[0021] The battery according to a second aspect of the present invention includes the battery cell described in any of the above embodiments.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the positive electrode sheet used to form a wound battery cell according to an embodiment of the present invention;

[0025] Figure 2 This is a partially enlarged cross-sectional view of the positive electrode sheet according to an embodiment of the present invention;

[0026] Figure 3 This is a side view of the battery cell according to an embodiment of the present utility model;

[0027] Figure 4 for Figure 3 Enlarged schematic diagram of area A in the middle (the current collector has a blank area);

[0028] Figure 5 for Figure 4 Enlarged view of region B in the middle;

[0029] Figure 6 for Figure 4 A schematic diagram of another embodiment (the current collector does not have a blank area);

[0030] Figure 7 for Figure 6 A magnified view of region C in the middle.

[0031] Figure label:

[0032] 10 cells; 20 casings;

[0033] Positive electrode 100; First current collector 110; First active layer 120; Tab 130; Empty foil region 140;

[0034] Negative electrode 200; Second current collector 210; Second active layer 220; Suspended portion 230; Main body portion 240;

[0035] Diaphragm 300;

[0036] First insulating component 400; first connecting part 410; second connecting part 420; third connecting part 430;

[0037] Second insulating component 500; Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] In existing lithium-ion battery manufacturing technology, electrode cutting is usually carried out using metal dies or laser cutting. Due to the wear of the die or the fluctuation of laser power during the production process, metal burrs are prone to appear on the current collector at the edge of the electrode. When the metal burrs are too large, they can puncture the separator. If the metal burrs come into contact with the electrode of the other polarity, it will cause a short circuit between the positive and negative electrodes, which will seriously affect the safety of the cell.

[0044] In addition, to reduce the risk of edge lithium plating, the negative electrode is often made larger than the positive electrode, so that the negative electrode protrudes relative to the positive electrode at the edge of the cell, providing enough lithium intercalation sites to receive lithium ions. For ease of description, the portion of the negative electrode protruding relative to the positive electrode is called the overhang, and the overhangs of adjacent negative electrodes are spaced apart. Because the overhang lacks the support of the positive electrode, electrode deformation or displacement is prone to occur during production or use.

[0045] To solve the above problems, such as Figures 1 to 5 As shown, a first aspect of this application discloses a battery cell 10, which includes a positive electrode 100, a negative electrode 200, and an insulating adhesive layer. Both the positive and negative electrodes include a current collector and an active material layer. The active material layer is used to undergo an electrochemical reaction with the electrolyte, and the current collector is used to collect the current generated by the electrochemical reaction to form a larger current output. The active material layer is coated on the surface of the current collector along its thickness direction. In some electrodes, the active material layer is coated on one side of the current collector, while in other electrodes, the active material layer is coated on both sides of the current collector. The insulating adhesive layer is located at the end of the battery cell 10 and includes a first insulating member 400 connected to the positive electrode 100 and a second insulating member 500 connected to the negative electrode 200.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, the positive electrode 100 includes a first current collector 110 and a first active layer 120 coated on both sides of the first current collector 110. The first current collector 110 is typically aluminum foil, but it can also be other composite foil materials. The first active layer 120 is the positive electrode active material, such as lithium cobalt oxide, lithium manganese oxide, and ternary materials. Similarly, refer to... Figure 1 , Figure 2 as well as Figure 5 As shown, the negative electrode 200 includes a second current collector 210 and a second active layer 220 coated on both sides of the second current collector 210. The second current collector 210 is usually copper foil, or it can be other composite foil materials. The second active layer 220 is the negative electrode active material, such as carbon-based materials, silicon-based materials, etc.

[0047] The battery cell 10 in this embodiment can be a wound battery cell 10 or a stacked battery cell 10. If the battery cell 10 is a wound battery cell 10, then the battery cell 10 includes a positive electrode 100 and a negative electrode 200, which are wound together to form the battery cell 10. At the edge of the battery cell 10, that is, at both ends of the width direction of any electrode, such as... Figures 3 to 5 As shown, the negative electrode 200 extends beyond the positive electrode 100 to provide more lithium insertion sites at the edge of the cell 10, thus preventing lithium deposition at the edge. For ease of description, as... Figure 5 As shown, the portion of the negative electrode 200 that extends beyond the positive electrode 100 is named the overhang portion 230, and the portion of the negative electrode 200 that abuts against the positive electrode 100 is named the main body portion 240. It should be noted that in... Figure 5 The dashed lines on the negative electrode 200 are only for convenient illustration of the outer suspension portion 230 and the main body portion 240, and do not represent a clear dividing line between the outer suspension portion 230 and the main body portion 240 on the negative electrode 200. It can be understood that, along the thickness direction of the wound cell 10, the main body portion 240 of the negative electrode 200 and the positive electrode 100 are alternately stacked. Thus, the outer suspension portions 230 of adjacent layers of the negative electrode 200 are spaced apart, and a first gap is defined between two outer suspension portions 230. The first insulating member 400 is located in the first gap and abuts against the outer suspension portions 230 on both sides respectively.

[0048] If cell 10 is a laminated cell 10, refer to Figure 5 As shown, the battery cell 10 includes multiple positive electrode plates 100 and multiple negative electrode plates 200, which are alternately stacked to form the battery cell 10. At the edges of the battery cell 10, that is, at both ends of the length direction and / or the width direction of the battery cell 10, the negative electrode plates 200 extend beyond the positive electrode plates 100. For ease of subsequent description, the direction in which the negative electrode plates 200 extend beyond the positive electrode plates 100 is defined as the first direction. Thus, the main body portion 240 of the negative electrode plate 200 is alternately stacked with the positive electrode plates 100, and the overhang portions 230 of adjacent negative electrode plates 200 are spaced apart, defining a first gap between the overhang portions 230. The first insulating member 400 is located in the first gap and abuts against the overhang portions 230 on both sides.

[0049] Understandably, the first insulating component 400 abuts against the outer suspension portion 230 on both sides, providing support for the outer suspension portion 230 of the negative electrode sheet 200, thereby improving the problem of deformation of the outer suspension portion 230 during production or use, reducing the battery failure rate, and increasing the battery life.

[0050] In summary, the first insulating member 400 serves both to cover the edge burrs of the positive electrode 100 and to support the outer suspension portion 230 of the negative electrode 200. Therefore, to increase the contact area between the first insulating member 400 and the outer suspension portion 230, such as... Figure 5 As shown, the width (i.e., the length along the first direction) of the first insulating member 400 on the positive electrode 100 is greater than the width (i.e., the length along the first direction) of the second insulating member 500 on the negative electrode 200. It should be explained that the second insulating member 500 of the negative electrode 200 does not need to provide support. Therefore, while ensuring the coverage of the edge burrs of the current collector, the size of the second insulating member 500 is smaller than the size of the first insulating member 400 to avoid the second insulating member 500 occupying too much space within the battery casing 20, thereby affecting the energy density of the battery.

[0051] It should be noted that in some embodiments, an insulating element is first formed on the electrode sheet (for example, a first insulating element 400 is formed on the edge of the positive electrode sheet 100 and a second insulating element 500 is formed on the edge of the negative electrode sheet 200), and then the electrode sheets are stacked or wound to form the battery cell 10, so that the insulating adhesive layer is located at the end of the battery cell 10.

[0052] Specifically, such as Figure 1 and Figure 2 As shown, the positive electrode 100 is coated with a first active layer 120. The first active layer 120 does not completely cover the first current collector 110. When viewed along the thickness direction of the positive electrode 100, there is a certain distance between the edge of the first active layer 120 and the edge of the first current collector 110, so that a first blank area without positive active material is formed at the edge of the positive electrode 100. The first insulating member 400 is disposed in the first blank area. Similarly, the edge of the negative electrode 200 is also provided with a second blank area without active material, and the second insulating member 500 is disposed in the second blank area.

[0053] Based on the foregoing, burrs are prone to appear on the current collector at the edge of the electrode. In this application, by providing a first insulating member 400 at the edge of the positive electrode 100 and a second insulating member 500 at the edge of the negative electrode 200, the edges of the positive electrode 100 and the negative electrode 200 are respectively wrapped by the first insulating member 400 and the second insulating member 500. Even if there are burrs on the edge of the electrode, they are covered by the insulating member, thus avoiding the situation where burrs puncture the separator 300 and cause a short circuit.

[0054] Furthermore, the first insulating element 400 covers the first current collector 110 and is connected to the positive electrode active material thereon. More specifically, such as Figure 2 As shown, the first insulating member 400 includes a first connecting portion 410, a second connecting portion 420, and a third connecting portion 430. The first connecting portion 410 and the second connecting portion 420 are located on opposite sides of the thickness direction of the first current collector 110. The first connecting portion 410 is connected to the first active layer 120 on one side, and the second connecting portion 420 is connected to the first active layer 120 on the other side, thereby covering the cross-section of the edge of the first active layer 120 to improve the problem of powder shedding from the edge of the positive electrode 100. The third connecting portion 430 is located at the edge of the first current collector 110 and is connected to the first connecting portion 410 and the second connecting portion 420, respectively. Thus, the first insulating member 400 wraps around the edge of the first current collector 110 to prevent burrs from being exposed.

[0055] Similarly, the second insulating member 500 covers the second current collector 210 and is connected to the negative electrode active material thereon. More specifically, the second insulating member 500 includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion (not shown in the figure, see reference). Figure 2 The structure of the first insulating member 400 is as follows: the fourth and fifth connecting portions are located on both sides of the second current collector 210, and the fourth connecting portion is connected to the second active layer 220 on one side, and the fifth connecting portion is connected to the second active layer 220 on the other side, thereby covering the end face of the edge of the second active layer 220 to improve the problem of powder shedding from the edge of the negative electrode 200. The sixth connecting portion is located at the edge of the second current collector 210 and is connected to the fourth and fifth connecting portions respectively, so that the second insulating member 500 wraps around the edge of the second current collector 210 to prevent burrs from being exposed.

[0056] In other embodiments, the positive electrode 100 and the negative electrode 200 are first formed into the battery cell 10, and then an insulating adhesive layer is formed at the end of the battery cell 10. For example... Figure 6 and Figure 7 As shown, a first insulating member 400 is formed at the end of the positive electrode 100. The first insulating member 400 is connected to the end face of the positive electrode 100, and there is no need to provide a first blank area for connecting the first insulating member 400. A second insulating member 500 is formed at the end of the negative electrode 200. The second insulating member 500 is connected to the end face of the negative electrode 200, and there is no need to provide a second blank area for connecting the second insulating member 500.

[0057] In some embodiments, the direction in which the negative electrode 200 extends from the positive electrode 100 is as follows: Figure 5In the first direction shown, the size of the first insulating member 400 is greater than or equal to the size of the first gap, so that the entire area of ​​the outer suspension 230 can be supported by the first insulating member 400, thereby giving the edge of the negative electrode 200 better support and reducing the risk of deformation.

[0058] It is understood that the battery cell 10 also includes a separator 300, separating any positive electrode 100 and its adjacent negative electrode 200 to prevent direct contact between irregularly shaped electrodes and potential short circuits. At the edge of the battery cell 10, the separator 300 extends beyond the negative electrode 200 to enclose it and prevent contact with the battery casing 20. It should be noted that, in cases such as... Figure 5 In the illustrated embodiment, two separators 300 adjacent to any positive electrode 100 are connected by a first insulating member 400, and / or two separators 300 adjacent to any negative electrode 200 are connected by a second insulating member 500.

[0059] Specifically, the first insulating element 400 and the second insulating element 500 also have an adhesive function. After the electrode sheets are wound or stacked to form the battery cell 10, the first insulating element 400 bonds the separators 300 on both sides into a single structure, and the second insulating element 500 bonds the separators 300 on both sides into a single structure. It can be understood that, as... Figure 4 and Figure 5 As shown, any first insulating member 400 and its adjacent second insulating member 500 are bonded to different sides of the same separator 300 and sequentially bonded along the thickness direction of the cell 10. Thus, all layers of separator 300 in the entire cell 10 are bonded together by the first insulating member 400 and the second insulating member 500, which realizes the fixation of the electrode position, avoids electrode displacement during production or use, improves the overall robustness of the cell 10, and enhances the safety performance of the cell 10.

[0060] In some embodiments, along the first direction, the diaphragm 300 extends beyond the second insulating member 500; in other words, the second insulating member 500 does not extend beyond the diaphragm 300 to avoid affecting the dimensions of the cell 10 along the first direction, thereby affecting the energy density of the cell 10. Furthermore, the distance from the edge of the second insulating member 500 to the edge of the diaphragm 300 is not less than 0.5 mm to reduce the impact of the second insulating member 500 on the energy density of the cell 10. That is, as... Figure 5 The dimension A shown is not less than 0.5 mm.

[0061] In some embodiments, along a first direction, the second insulating member 500 extends relative to the first insulating member 400, and the distance from the edge of the second insulating member 500 to the edge of the first insulating member 400 is not greater than 1 mm, that is, as... Figure 5The dimension B shown is no greater than 1 mm, so as to ensure that neither the first insulating member 400 nor the second insulating member 500 protrudes from the diaphragm 300, thereby enabling the diaphragm 300 to be bonded.

[0062] In some embodiments, the thickness of the positive electrode 100 is not less than the thickness of the first insulating member 400, and the difference between the thickness of the positive electrode 100 and the thickness of the first insulating member 400 is not greater than 0.01 mm. And / or, the thickness of the negative electrode 200 is not less than the thickness of the second insulating member 500, and the difference between the thickness of the negative electrode 200 and the thickness of the second insulating member 500 is not greater than 0.01 mm. Thus, the first insulating member 400 provides sufficient support strength for the negative electrode 200 without affecting the overall thickness of the cell 10.

[0063] In addition, such as Figure 1 As shown, when viewed along the thickness direction of the positive electrode 100, the first insulating member 400 is a closed ring. And / or, when viewed along the thickness direction of the negative electrode 200, the second insulating member 500 is a closed ring. It can be understood that the ring-shaped insulating member can provide all-around protection for the edges of the electrode, preventing burrs from puncturing the separator 300. Furthermore, in... Figure 1 In the positive electrode sheet 100 shown for the winding core, at one end of the positive electrode sheet 100 along its length direction, the first insulating member 400 does not completely cover the first blank area. The first insulating member 400 is provided at the edge of the first blank area, and the remaining part forms an empty foil area 140. A tab 130 is welded on the empty foil area 140 to form a port for concentrated current input or output.

[0064] A second aspect of this application provides a battery comprising the cell 10 mentioned in any of the foregoing embodiments. This battery can be a pouch battery or a steel-cased battery, such as... Figure 3 As shown, the battery cell 10 is housed within the casing 20. Since this battery incorporates the technical solutions of any of the above embodiments, it should also possess the technical effects of that embodiment, and will not be elaborated further here.

[0065] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery cell, characterized in that, It includes a positive electrode sheet, a negative electrode sheet, and an insulating adhesive layer, wherein: The positive electrode and the negative electrode are wound or stacked to form the battery cell. At the end of the battery cell, the negative electrode extends outward relative to the positive electrode. The portion of the negative electrode that extends outward relative to the positive electrode is defined as an overhang. Adjacent overhangs define a first gap. The insulating adhesive layer is located at the end of the battery cell. The insulating adhesive layer includes a first insulating member connected to the positive electrode plate and a second insulating member connected to the negative electrode plate. The first insulating member is located in the first gap and abuts against the outer overhangs on both sides.

2. The battery cell according to claim 1, characterized in that, The positive electrode has a first blank area without active material coating on its edge, and the first insulating member is disposed in the first blank area; and / or, the negative electrode has a second blank area without active material coating on its edge, and the second insulating member is disposed in the second blank area.

3. The battery cell according to claim 2, characterized in that, The positive electrode includes a first current collector and a first active layer coated on both sides of the first current collector. The first insulating member includes a first connecting portion and a second connecting portion located on both sides of the first current collector, and a third connecting portion connected to the first connecting portion and the second connecting portion. The first connecting portion is connected to the first active layer on one side, and the second connecting portion is connected to the first active layer on the other side. And / or, the negative electrode includes a second current collector and a second active layer coated on both sides of the second current collector, the second insulating member includes a fourth connecting portion and a fifth connecting portion located on both sides of the second current collector, and a sixth connecting portion connected to the fourth connecting portion and the fifth connecting portion, the fourth connecting portion being connected to the second active layer on one side, and the fifth connecting portion being connected to the second active layer on the other side.

4. The battery cell according to claim 1, characterized in that, Along the direction in which the negative electrode extends from the positive electrode, the size of the first insulating member is larger than the size of the second insulating member.

5. The battery cell according to claim 1, characterized in that, Along the direction in which the negative electrode extends from the positive electrode, the size of the first insulating member is greater than or equal to the size of the first gap.

6. The battery cell according to claim 1, characterized in that, The battery cell also includes a separator, wherein any positive electrode and the adjacent negative electrode are separated by the separator, and the separator extends outward relative to the negative electrode at the edge of the battery cell. Wherein, two separators adjacent to any of the positive electrode plates are connected by the first insulating member, and / or, two separators adjacent to any of the negative electrode plates are connected by the second insulating member.

7. The battery cell according to claim 6, characterized in that, Along the direction in which the negative electrode extends from the positive electrode, the separator extends relative to the second insulating member, and the distance from the edge of the second insulating member to the edge of the separator is not less than 0.5 mm.

8. The battery cell according to claim 1, characterized in that, Along the direction in which the negative electrode extends from the positive electrode, the second insulating member extends relative to the first insulating member, and the distance from the edge of the second insulating member to the edge of the first insulating member is not greater than 1 mm.

9. The battery cell according to claim 1, characterized in that, The thickness of the positive electrode sheet is not less than the thickness of the first insulating component, and the difference between the thickness of the positive electrode sheet and the thickness of the first insulating component is not greater than 0.01 mm. And / or, the thickness of the negative electrode sheet is not less than the thickness of the second insulating member, and the difference between the thickness of the negative electrode sheet and the thickness of the second insulating member is not greater than 0.01 mm.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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