Laminated cells and batteries

Abstract

The utility model provides a laminated battery cell and a battery. The laminated battery cell comprises a negative electrode sheet, a positive electrode sheet and a diaphragm stacked on each other. The diaphragm is an insulator, and the diaphragm separates the positive electrode sheet and the negative electrode sheet. At least a portion of the peripheral edge of the negative electrode sheet is covered by a glue layer, and the peripheral edge of the positive electrode sheet is exposed outside the glue layer. The glue layer of the laminated battery cell can cover or wrap the burrs at the edge of the negative electrode sheet, thereby reducing the risk of the burrs piercing the aluminum-plastic film, and improving the safety of the laminated battery cell and the battery using the battery cell. In addition, since the glue layer is provided at the edge of the negative electrode sheet, the distance between the edge of the diaphragm and the edge of the negative electrode sheet can be set to be smaller, thereby reducing the volume of the laminated battery cell.

Description

Technical Field

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

[0002] The laminated battery cell is composed of a stack of positive electrode sheets, negative electrode sheets and separators, and neither the separators nor the electrode sheets need to be wound. In the prior art, the size of the negative electrode sheet of the laminated battery cell is usually slightly larger than that of the positive electrode sheet to reduce the risk of lithium plating. In the production process of the battery cell, a single electrode sheet is usually cut from a parent electrode sheet roll, and burrs may exist on the edges of the electrode sheets obtained after cutting. The burrs may affect the safety of the battery. For example, if the battery cell is used in a soft-pack battery, the burrs of the negative electrode sheet pierce the aluminum-plastic film, thereby causing a high risk of leakage of the soft-pack battery. 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 laminated battery cell, at least a portion of the edge of the negative electrode sheet of which is covered with a glue layer, thereby reducing the impact of burrs on the safety of the battery.

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

[0005] The stacked battery cell according to the first aspect of the present invention includes: a positive electrode sheet; a negative electrode sheet; a diaphragm, wherein the diaphragm is an insulator, the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked on each other, and the diaphragm separates the positive electrode sheet and the negative electrode sheet; a glue layer, wherein at least a portion of the outer peripheral edge of the negative electrode sheet is covered by the glue layer, and at least one of the outer peripheral edge of the positive electrode sheet and the outer peripheral edge of the diaphragm is not covered by the glue layer.

[0006] The laminated battery cell according to the first embodiment of the utility model has at least the following beneficial effects: at least a portion of the burrs on the outer peripheral edge of the negative electrode sheet can be wrapped by the glue layer, so there are fewer burrs directly exposed at the edge of the negative electrode sheet, and the laminated battery cell is conducive to improving the safety of the battery. In addition, since the outer peripheral edge of the positive electrode sheet and / or the outer peripheral edge of the diaphragm does not need to be coated with glue, the amount of glue required for the laminated battery cell is less, and the cost of the laminated battery cell is lower.

[0007] According to some embodiments of the present invention, the edge of the positive electrode sheet and the peripheral edge of the separator are not covered by the glue layer. The advantage of this embodiment is that the amount of glue required for the laminated battery cell can be further reduced.

[0008] According to some embodiments of the utility model, the laminated battery cell further includes a negative electrode ear, one end of the negative electrode sheet in its own length direction is connected to the negative electrode ear, the peripheral edge of the negative electrode sheet includes a first side edge and a second side edge, the first side edge and the second side edge are spaced apart along the width direction of the negative electrode sheet, any two of the length direction, the width direction and the thickness direction of the negative electrode sheet are perpendicular to each other, and the first side edge and the second side edge are both covered by the adhesive layer. The advantage of this embodiment is that the adhesive layer can reduce the risk of burrs at the first side edge and the second side edge damaging the aluminum-plastic film or damaging the battery shell, thereby improving the safety of the battery.

[0009] According to some embodiments of the utility model, the outer peripheral edge of the negative electrode sheet further includes a third side edge, the two ends of the third side edge are respectively connected to the first side edge and the second side edge, the third side edge is located at an end of the negative electrode sheet away from the negative electrode ear, and the third side edge is exposed outside the glue layer. The advantage of this embodiment is that the amount of glue required for the laminated battery cell can be further reduced.

[0010] According to some embodiments of the utility model, the outer peripheral edge of the negative electrode sheet also includes a fourth side, the two ends of the fourth side are respectively connected to the first side and the second side, the fourth side is located at one end of the negative electrode sheet close to the negative electrode ear, and the fourth side is exposed outside the glue layer. The advantage of this embodiment is that it is conducive to further reducing the amount of glue required for the laminated battery cell, thereby reducing the cost of the laminated battery cell. In addition, since the negative electrode ear and the positive electrode ear both protrude forward relative to the fourth side of the negative electrode sheet, if the glue layer needs to cover the fourth side, then the negative electrode ear and the positive electrode ear may hinder the glue coating process of the fourth side. Therefore, not coating the fourth side with glue is also conducive to reducing the manufacturing difficulty of the laminated battery cell.

[0011] According to some embodiments of the utility model, the width of the negative electrode sheet is greater than the width of the positive electrode sheet, and the width of the separator is greater than the width of the negative electrode sheet. The advantage of this embodiment is that it can reduce the risk of lithium plating of the laminated battery cell and reduce the part of the negative electrode sheet directly exposed to the outside, thereby improving the safety of the laminated battery cell and the battery using the battery cell.

[0012] According to some embodiments of the utility model, the width of the negative electrode sheet is W1, the width of the positive electrode sheet is W2, 0.5mm≤W1-W2≤2mm. This embodiment can prevent the size of the negative electrode sheet from being too large, thereby reducing the waste of negative electrode active materials and reducing the volume of the laminated battery cell.

[0013] According to some embodiments of the utility model, the width of the separator is W3, the width of the negative electrode sheet is W1, 1mm≤W3-W1≤6mm. This embodiment can prevent the separator from being too wide, thereby preventing the separator from being wasted and causing the laminated battery cell to be too large.

[0014] According to some embodiments of the utility model, the adhesive layer is an insulator. The advantage of this embodiment is that even if the adhesive layer directly contacts the aluminum-plastic film or a battery casing made of metal, the battery core and the aluminum-plastic film or the battery casing will not form a circuit, and the aluminum-plastic film or the battery casing will not be corroded (electrochemical corrosion).

[0015] The battery according to the second embodiment of the utility model comprises the laminated battery cell as described in the first embodiment. The battery can be a soft pack battery (the battery cell is encapsulated by an aluminum plastic film) or a hard shell battery (the battery cell is encapsulated by a hard metal shell).

[0016] The battery according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: the negative electrode sheet of the battery cell has fewer burrs directly exposed, so the battery is safer.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned 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 three-dimensional diagram of a laminated battery cell according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of region A;

[0021] Figure 3 A top view of a negative electrode sheet and a negative electrode ear connected to each other;

[0022] Figure 4 for Figure 1 Cross-sectional view of a laminated battery cell.

[0023] Reference numerals:

[0024] 100 - laminated battery cell, 101 - positive electrode sheet, 102 - negative electrode sheet, 103 - separator, 104 - positive electrode ear, 105 - negative electrode ear, 106 - adhesive layer, 107 - first side, 108 - second side, 109 - third side, 110 - fourth side. DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0027] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] 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.

[0029] Figure 1 FIG. 1 shows a laminated battery cell 100 according to an embodiment of the present invention, and the laminated battery cell 100 may be a lithium-ion battery cell. Figure 2As shown, the laminated battery cell 100 includes a positive electrode sheet 101, a negative electrode sheet 102 and a separator 103 stacked on each other. The separator 103 is an insulator, and the separator 103 is arranged between the positive electrode sheet 101 and the negative electrode sheet 102. The separator 103 separates the positive electrode sheet 101 and the negative electrode sheet 102 to prevent the positive electrode sheet 101 and the negative electrode sheet 102 from directly contacting each other and causing a short circuit. The positive electrode sheet 101 includes a positive electrode collector and a positive electrode active material layer arranged on the surface of the positive electrode collector (the positive electrode collector and the positive electrode active material layer are not specifically shown), the positive electrode collector can be set as aluminum foil, and the material of the positive electrode active material layer includes at least one of the following materials: lithium cobalt oxide, lithium nickel manganese cobalt oxide, lithium manganese iron phosphate, sodium iron phosphate, lithium vanadium phosphate, sodium vanadium phosphate, lithium vanadium phosphate, sodium vanadium phosphate, lithium vanadate, lithium manganate, lithium nickel oxide, lithium nickel cobalt manganate, lithium-rich manganese-based materials, lithium nickel cobalt aluminum oxide or lithium titanate. The negative electrode sheet 102 includes a negative electrode current collector and a negative electrode active material layer disposed on the surface of the negative electrode current collector (the negative electrode current collector and the negative electrode active material layer are not specifically shown), the negative electrode current collector can be set to copper foil, and the material of the negative electrode active material layer can be set to graphite. The material of the separator 103 can be set to PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).

[0030] The size of the negative electrode sheet 102 is larger than that of the positive electrode sheet 101, for example Figure 2 or Figure 4 As shown, the width of the negative electrode sheet 102 is greater than that of the positive electrode sheet 101. For lithium-ion batteries, the fact that the negative electrode sheet 102 is larger than the positive electrode sheet 101 is beneficial to reducing the risk of lithium plating. Specifically, during the charging process of the battery, lithium ions will be deintercalated from the positive electrode sheet 101 (cathode) and embedded in the negative electrode sheet 102 (anode); however, when some abnormal conditions occur, if the lithium ions deintercalated from the positive electrode sheet 101 cannot be embedded in the negative electrode sheet 102, the lithium ions can only be precipitated on the surface of the negative electrode sheet 102 to form a layer of gray substance. This situation is "lithium plating". The larger size of the negative electrode sheet 102 means that the total amount of negative active material on the negative electrode sheet 102 is larger, and the negative electrode sheet 102 can absorb more lithium ions. In this way, the risk of lithium plating in the battery is lower.

[0031] like Figure 2As shown, the laminated battery 100 also includes a glue layer 106, at least a portion of the peripheral edge of the negative electrode sheet 102 is covered by the glue layer 106, and at least one of the peripheral edge of the positive electrode sheet 101 and the peripheral edge of the diaphragm 103 is not covered by the glue layer 106. That is, at least one of the peripheral edge of the positive electrode sheet 101 and the peripheral edge of the diaphragm 103 does not need to be coated with glue. At least a portion of the burrs located at the peripheral edge of the negative electrode sheet 102 can be wrapped by the glue layer 106 (the burrs are not shown), so there are fewer directly exposed burrs at the edge of the negative electrode sheet 102, the risk of the burrs directly contacting the aluminum-plastic film is lower, and the risk of the negative electrode sheet 102 piercing the aluminum-plastic film is lower, and the laminated battery 100 is conducive to improving the safety of the battery. In addition, since the peripheral edge of the positive electrode sheet 101 and / or the peripheral edge of the diaphragm 103 do not need to be coated with glue, the amount of glue required to use the laminated battery 100 of the utility model is less, and the cost of the laminated battery 100 is lower.

[0032] The glue layer 106 may completely cover the outer edge of the negative electrode sheet 102, or may not completely cover the outer edge of the negative electrode sheet 102 (eg, Figure 2 As shown in FIG. 1 ). Compared with the prior art in which the outer peripheral edge of the negative electrode sheet 102 is completely exposed, the adhesive layer 106 of the present invention can cover at least a portion of the burrs at the edge of the negative electrode sheet 102, thereby reducing the safety risks caused by the burrs.

[0033] It should be noted that the laminated battery cell 100 of the present invention is not only suitable for soft-pack batteries, but also for hard-shell batteries. Soft-pack batteries encapsulate the battery cells with an aluminum-plastic film, while hard-shell batteries encapsulate the battery cells with a relatively hard outer shell, which can be made of metal materials such as steel and aluminum alloy. In hard-shell batteries, a layer of insulating film is usually provided between the outer surface of the battery cell and the inner wall surface of the outer shell to prevent direct contact between the battery cell and the outer shell. The reduction of directly exposed burrs of the battery cell helps to reduce the risk of puncture of the insulating film, thereby improving the safety of the battery. Therefore, applying the laminated battery cell 100 to hard-shell batteries can also improve the safety of hard-shell batteries.

[0034] In some embodiments, the glue layer 106 can be set as an insulator, for example, the glue layer 106 is solidified by insulating glue. The advantage of this arrangement is that even if the glue layer 106 directly contacts the aluminum-plastic film or the battery shell made of metal, the battery cell and the aluminum-plastic film or the battery shell will not form a circuit, and the aluminum-plastic film or the battery shell will not be corroded (electrochemical corrosion).

[0035] In addition, in the prior art, in order to improve the safety of the battery cell, the size of the diaphragm 103 is usually slightly larger than the size of the electrode, and the edge of the diaphragm 103 will extend beyond the edge of the electrode. For the laminated battery cell 100 of the present invention, since the outer peripheral edge of the negative electrode sheet 102 is provided with a glue layer 106, the glue layer 106 itself can protect the edge of the electrode, so the protruding distance of the edge of the diaphragm 103 relative to the outer peripheral edge of the negative electrode sheet 102 can be reduced (compared to the prior art), so as to reduce the total area of ​​the diaphragm 103 required for the laminated battery cell 100, thereby reducing the cost of the laminated battery cell 100. The distance between the edge of the diaphragm 103 and the edge of the negative electrode sheet 102 can refer to the description of W1 and W3 below.

[0036] exist Figure 2 In the embodiment, the glue layer 106 disposed at the peripheral edge of the negative electrode sheet 102 is in the shape of a wavy line. However, in other embodiments, the glue layer 106 located at the peripheral edge of the negative electrode sheet 102 may also be set to other shapes, for example, the glue layer 106 is in a straight line shape, and the glue layer 106 is composed of a plurality of glue dots arranged at intervals. The shape of the glue layer 106 is not specifically limited here, as long as at least a portion of the peripheral edge of the negative electrode sheet 102 is covered by the glue layer 106. In order for the glue layer 106 to have a better wrapping effect on the burrs, the thickness of the glue layer 106 may be 0.5mm-3mm. It should be noted that the thickness of the glue layer 106 mentioned here is not the size of the glue layer 106 in the thickness direction of the negative electrode sheet 102, and the thickness of the glue layer 106 refers to the size of the glue layer 106 in the width direction of the negative electrode sheet 102. The width direction and thickness direction of the negative electrode sheet 102 will be explained in detail below. If the thickness of the glue layer 106 is Figure 2 The thickness of the glue layer 106 is the size of the glue layer 106 in the left-right direction. The size of the glue layer 106 in the thickness direction (up-down direction) of the negative electrode sheet 102 may be equal to the thickness of the negative electrode sheet 102 itself.

[0037] like Figure 2 or Figure 4 As shown, in some embodiments, in order to make the size of the negative electrode sheet 102 larger than the size of the positive electrode sheet 101, the negative electrode sheet 102 and the positive electrode sheet 101 are configured such that the width of the negative electrode sheet 102 is larger than the width of the positive electrode sheet 101. Accordingly, the width of the separator 103 is larger than the width of the negative electrode sheet 102, so that the separator 103 shields the protruding portion of the negative electrode sheet 102 relative to the positive electrode sheet 101, and reduces the portion of the negative electrode sheet 102 directly exposed to the outside, thereby improving the safety of the laminated battery cell 100 and the battery using the battery cell.

[0038] The width of the negative electrode sheet 102, the width of the positive electrode sheet 101 and the width of the separator 103 are explained below. Figure 1As shown, the laminated battery cell 100 further includes a positive electrode tab 104 and a negative electrode tab 105. One end of the negative electrode sheet 102 in its length direction is connected to the negative electrode tab 105 (eg, Figure 3 As shown), one end of the positive electrode sheet 101 in its length direction is connected to the positive electrode ear 104, and the positive electrode ear 104 and the negative electrode ear 105 are arranged at the same end of the laminated battery cell 100 (as shown Figure 1 As shown). In the embodiment shown in the accompanying drawings, the stacked battery cell 100 adopts a multi-pole ear design, that is, each negative electrode sheet 102 is connected to a negative electrode ear 105, and each positive electrode sheet 101 is connected to a positive electrode ear 104. The multi-pole ear design is conducive to reducing the internal resistance and improving the charging and discharging speed of the battery cell. Any two of the width direction of the negative electrode sheet 102, the length direction of the negative electrode sheet 102, and the thickness direction of the negative electrode sheet 102 are perpendicular to each other. The thickness direction of the negative electrode sheet 102 is also the direction in which the negative electrode sheet 102, the positive electrode sheet 101 and the separator 103 are stacked on each other. More specifically, in the accompanying drawings, the width direction of the negative electrode sheet 102 is the left-right direction, the length direction of the negative electrode sheet 102 is the front-to-back direction, and the thickness direction of the negative electrode sheet 102 is the top-to-bottom direction. The width of the negative electrode sheet 102 is the dimension of the negative electrode sheet 102 in its own width direction, the width of the positive electrode sheet 101 is the dimension of the positive electrode sheet 101 in the width direction of the negative electrode sheet 102 , and the width of the separator 103 is the dimension of the separator 103 in the width direction of the negative electrode sheet 102 .

[0039] In some embodiments, the width of the negative electrode sheet 102 is W1, the width of the positive electrode sheet 101 is W2, and W1 and W2 satisfy: 0.5mm≤W1-W2≤2mm. It should be noted that W1, W2 and W3 mentioned below are not shown in the accompanying drawings. The utility model adopts these symbols for the convenience of referring to these widths. The difference between the width of the negative electrode sheet 102 and the width of the positive electrode sheet 101 is not less than 0.5mm in order to allow the negative electrode sheet 102 to have a larger area to reduce the risk of lithium precipitation. The difference between the width of the negative electrode sheet 102 and the width of the positive electrode sheet 101 is not greater than 2mm in order to prevent the size of the negative electrode sheet 102 from being too large, thereby reducing the waste of negative electrode active materials and reducing the volume of the laminated battery cell 100.

[0040] In some embodiments, the width of the diaphragm 103 is W3, and W1 and W3 satisfy: 1mm≤W3-W1≤6mm. Accordingly, the difference in single-side width between the diaphragm 103 and the negative electrode sheet 102 is between 0.5mm-3mm, that is, the distance between the left side of the diaphragm 103 and the left side of the negative electrode sheet 102 is 0.5mm-3mm, and the distance between the right side of the diaphragm 103 and the right side of the negative electrode sheet 102 is 0.5mm-3mm. When the width of the diaphragm 103 and the width of the negative electrode sheet 102 meet the above conditions, the width of the diaphragm 103 is greater than the width of the negative electrode sheet 102 so that the diaphragm 103 can fully shield the negative electrode sheet 102, and the width of the diaphragm 103 will not be too large, so as to avoid wasting the diaphragm 103 and the excessive volume of the laminated battery cell 100.

[0041] In some embodiments, in order to further reduce the amount of glue required for the laminated battery 100, the outer peripheral edge of the separator 103 and the outer peripheral edge of the positive electrode sheet 101 are not covered by the glue layer 106 (eg, Figure 2 shown). Figure 2 The laminated battery cell 100 shown includes a plurality of separators 103, and the laminated battery cell 100 can be made by a bag-making lamination process. Figure 2 In the manufacturing process of the laminated battery cell 100 shown, the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 may be stacked on each other before the edge of the negative electrode sheet 102 is coated with glue to form a glue layer 106. Alternatively, the edge of the negative electrode sheet 102 may be coated with glue to form a glue layer 106, and then the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 may be stacked on each other, which is conducive to reducing the difficulty of coating glue, thereby reducing the manufacturing difficulty of the laminated battery cell 100. In other embodiments not shown in the drawings, the laminated battery cell 100 adopts a Z-type laminate design. In this case, the edge of the negative electrode sheet 102 may be coated with glue to form a glue layer 106, and then the positive electrode sheet 101, the negative electrode sheet 102 and the separator 103 may be stacked on each other.

[0042] like Figure 3 As shown, in some embodiments, the edge of the negative electrode sheet 102 includes a first side edge 107 and a second side edge 108, and the first side edge 107 and the second side edge 108 are spaced apart in the width direction of the negative electrode sheet 102, and the first side edge 107 and the second side edge 108 are both covered by the glue layer 106. More specifically, the first side edge 107 is the left side of the negative electrode sheet 102, and the second side edge 108 is the right side of the negative electrode sheet 102. In the case where the width of the negative electrode sheet 102 is greater than the width of the positive electrode sheet 101, the first side edge 107 and the second side edge 108 will protrude relative to the edge of the positive electrode sheet 101 (such as Figure 2As shown in FIG. 1 , the first side edge 107 and the second side edge 108 are more likely to contact the aluminum-plastic film or the battery housing. Therefore, the adhesive layer 106 can reduce the risk of the burrs at the first side edge 107 and the second side edge 108 damaging the aluminum-plastic film or the battery housing, thereby improving the safety of the battery.

[0043] like Figure 3 As shown, in some embodiments, the edge of the negative electrode sheet 102 further includes a third side 109, the two ends of the third side 109 are respectively connected to the first side 107 and the second side 108, the third side 109 is located at the end of the negative electrode sheet 102 away from the negative electrode ear 105, and the third side 109 is exposed outside the glue layer 106 (that is, the third side 109 is not covered by the glue layer 106). More specifically, the third side 109 is the rear side of the negative electrode sheet 102. Such a configuration is conducive to further reducing the amount of glue required for the laminated battery cell 100, thereby reducing the cost of the laminated battery cell 100.

[0044] like Figure 3 As shown, in some embodiments, the edge of the negative electrode sheet 102 further includes a fourth side 110, and the two ends of the fourth side 110 are respectively connected to the first side 107 and the second side 108, and the fourth side 110 is located at one end of the negative electrode sheet 102 close to the negative electrode ear 105, and the fourth side 110 is also exposed outside the glue layer 106 (that is, the fourth side 110 is not covered by the glue layer 106). More specifically, the fourth side 110 is the front side of the negative electrode sheet 102. The fourth side 110 being exposed outside the glue layer 106 means that the fourth side 110 does not need to be coated with glue, which is conducive to further reducing the amount of glue required for the laminated battery 100, thereby reducing the cost of the laminated battery 100. In addition, since the negative electrode tab 105 and the positive electrode tab 104 both protrude forward relative to the fourth side 110 of the negative electrode sheet 102, if the glue layer 106 needs to cover the fourth side 110, the negative electrode tab 105 and the positive electrode tab 104 may hinder the glue coating process on the fourth side 110. Therefore, not coating the fourth side 110 with glue is conducive to reducing the manufacturing difficulty of the laminated battery cell 100.

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

Claims

1. A laminated battery cell, characterized in that: include: Positive electrode; Negative electrode; A diaphragm, wherein the diaphragm is an insulator, the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked on each other, and the diaphragm separates the positive electrode sheet from the negative electrode sheet; A glue layer, at least a portion of the outer peripheral edge of the negative electrode sheet is covered by the glue layer, and at least one of the outer peripheral edge of the positive electrode sheet and the outer peripheral edge of the separator is not covered by the glue layer.

2. The laminated battery cell according to claim 1, characterized in that: The edge of the positive electrode sheet and the peripheral edge of the separator are not covered by the glue layer.

3. The laminated battery cell according to claim 1, characterized in that: The stacked battery cell also includes a negative electrode ear, one end of the negative electrode sheet in its length direction is connected to the negative electrode ear, the outer peripheral edge of the negative electrode sheet includes a first side edge and a second side edge, the first side edge and the second side edge are spaced apart along the width direction of the negative electrode sheet, any two of the length direction, the width direction and the thickness direction of the negative electrode sheet are perpendicular to each other, and the first side edge and the second side edge are both covered by the glue layer.

4. The laminated battery cell according to claim 3, characterized in that: The outer peripheral edge of the negative electrode sheet also includes a third side, the two ends of the third side are respectively connected to the first side and the second side, the third side is located at one end of the negative electrode sheet away from the negative electrode ear, and the third side is exposed outside the glue layer.

5. The laminated battery cell according to claim 3, characterized in that: The outer peripheral edge of the negative electrode sheet also includes a fourth side, both ends of which are respectively connected to the first side and the second side, the fourth side is located at one end of the negative electrode sheet close to the negative electrode ear, and the fourth side is exposed outside the glue layer.

6. The laminated battery cell according to claim 1, characterized in that: The width of the negative electrode sheet is greater than that of the positive electrode sheet, and the width of the separator is greater than that of the negative electrode sheet.

7. The laminated battery cell according to claim 6, characterized in that: The width of the negative electrode sheet is W1, the width of the positive electrode sheet is W2, and 0.5 mm ≤ W1 - W2 ≤ 2 mm.

8. The laminated battery cell according to claim 6, characterized in that: The width of the separator is W3, the width of the negative electrode sheet is W1, and 1mm≤W3-W1≤6mm.

9. The laminated battery cell according to any one of claims 1 to 8, characterized in that: The adhesive layer is an insulator.

10. A battery, characterized in that It comprises the laminated battery cell as claimed in any one of claims 1 to 9.

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