Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a battery shell, a battery cell and a tab insulating layer, and the battery shell comprises steel; the battery cell is at least partially located in the battery shell, the battery cell comprises a positive plate, a negative plate and a single positive tab which are stacked, the single positive tab is connected to one side of the positive plate in a first direction, and the negative plate comprises a negative current collector layer and a negative active material layer located on at least one side of the negative current collector layer; the tab insulating layer is arranged on at least one side surface of the single positive tab, and the tab insulating layer at least covers the end part, close to the positive plate, of the single positive tab; wherein the tab insulating layer is arranged to exceed the negative electrode active material layer in the first direction, the distance between the end part of the negative electrode active material layer in the first direction and the end part of the tab insulating layer in the first direction is 0.1-2mm, the thickness of the battery shell is less than or equal to 0.4 mm, and the battery has relatively high charging speed and relatively high safety and stability.

Description

Technical Field

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

[0002] In the related art, the battery shell can use a steel shell instead of an aluminum shell to improve the strength of the battery shell. However, the thermal conductivity of the steel shell is low, and it is difficult for the battery cell to adjust its temperature through the temperature control structure outside the battery shell. At the same time, the root of the single-piece positive ear is generally provided with an insulating layer to reduce the risk of short circuit between the single-piece positive ear and the negative electrode. During the charging process of the battery, the negative electrode is an endothermic reaction, and the insulating layer will affect the thermal conductivity of the single-piece positive ear and other structures to the negative electrode, thereby affecting the charging efficiency of the battery.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a battery, which can improve the technical problem of low battery charging efficiency.

[0005] Battery Included:

[0006] a battery housing, the battery housing comprising steel;

[0007] A battery cell, at least partially located in a battery housing, the battery cell comprising a stacked positive electrode sheet, a negative electrode sheet, and a single positive electrode tab, the single positive electrode tab is connected to one side of the positive electrode sheet in a first direction, and the negative electrode sheet comprises a negative electrode current collector layer and a negative electrode active material layer located on at least one side of the negative electrode current collector layer;

[0008] A tab insulation layer, which is disposed on at least one side of the single-piece positive tab, and the tab insulation layer at least covers the end of the single-piece positive tab close to the positive electrode sheet;

[0009] The tab insulation layer is arranged beyond the negative electrode active material layer in the first direction, and the distance between the end of the negative electrode active material layer in the first direction and the end of the tab insulation layer in the first direction is 0.1mm-2mm, and the thickness of the battery shell is ≤0.4mm.

[0010] In the present invention, if the distance between the end of the negative electrode active material layer in the first direction and the end of the tab insulation layer in the first direction is too small, there is a risk of short circuit between the positive electrode sheet and the negative electrode sheet; if the distance between the end of the negative electrode active material layer in the first direction and the end of the tab insulation layer in the first direction is too large, the tab insulation layer will block the heat conduction from the positive tab to the negative electrode sheet, thereby affecting the charging efficiency of the battery. The present invention sets the distance between the end of the negative electrode active material layer in the first direction and the end of the tab insulation layer in the first direction to an appropriate size, which can reduce the risk of short circuit between the positive and negative electrode sheets, while also ensuring the charging efficiency of the battery.

[0011] The utility model also provides a battery device, which includes the above-mentioned battery and also has the technical effect of the above-mentioned battery.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0014] in:

[0015] Figure 1 It is a schematic structural diagram of an exemplary embodiment of a battery disclosed in the present invention;

[0016] Figure 2 is a cross-sectional view of a winding core in an exemplary embodiment of a battery disclosed herein;

[0017] Figure 3 A schematic diagram of the stacked structure of positive and negative electrode sheets in an exemplary embodiment of the battery disclosed herein;

[0018] Figure 4 It is a schematic diagram of the stacking structure of positive and negative electrode sheets in an exemplary embodiment of the battery disclosed in the present invention.

[0019] Description of reference numerals:

[0020] 1. Battery case; 2. Battery cell; 21. Positive electrode sheet; 211. Positive electrode current collector layer; 212. Positive electrode active material layer; 22. Negative electrode sheet; 221. Negative electrode current collector layer; 222. Negative electrode active material layer; 24. Single-piece positive electrode ear; 25. Single-piece negative electrode ear; 3. Ear insulation layer. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0022] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0023] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0024] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0025] like Figure 1-4 As shown, Figure 1 It is a schematic structural diagram of an exemplary embodiment of a battery disclosed in the present invention. Figure 2 is a cross-sectional view of a winding core in an exemplary embodiment of a battery disclosed herein, Figure 3 Schematic diagram of the stacked structure of positive and negative electrode sheets in an exemplary embodiment of the battery disclosed herein, Figure 4 This is a schematic diagram of the stacked structure of positive and negative electrodes in an exemplary embodiment of the battery disclosed herein. Figure 4 and Figure 3 The stacked structures of the positive and negative electrodes are the same.

[0026] The battery comprises: a battery case 1, a battery cell 2, and a tab insulating layer 3, wherein the battery case 1 comprises steel; the battery cell 2 is at least partially located in the battery case 1, the battery cell 2 comprises a stacked positive electrode sheet 21, a negative electrode sheet 22, and a single positive electrode tab 24, the single positive electrode tab 24 is connected to one side of the positive electrode sheet 21 in a first direction X, the negative electrode sheet 22 comprises a negative electrode collector layer 221 and a negative electrode active material layer 222 located on at least one side of the negative electrode collector layer 221; the tab insulating layer 3 is arranged on at least one side of the single positive electrode tab 24, and the tab insulating layer 3 at least covers the end of the single positive electrode tab 24 close to the positive electrode sheet 21; wherein the tab insulating layer 3 is arranged beyond the negative electrode active material layer 222 in the first direction X, and the distance d1 between the end of the negative electrode active material layer 222 in the first direction X and the end of the tab insulating layer 3 in the first direction X is 0.1 mm-2 mm, and the thickness of the battery case is ≤0.4 mm.

[0027] In this exemplary embodiment, the distance between the end of the negative active material layer 222 in the first direction X and the end of the tab insulation layer 3 in the first direction X is too small, and there is a risk of short circuit between the positive electrode sheet 21 and the negative electrode sheet 22; the distance between the end of the negative active material layer 222 in the first direction X and the end of the tab insulation layer in the first direction X is too large, and the tab insulation layer 3 will block the heat conduction of the single positive tab 24 to the negative electrode sheet 22, thereby affecting the charging efficiency of the battery. In this exemplary embodiment, the distance between the end of the negative active material layer 222 in the first direction X and the end of the tab insulation layer 3 in the first direction X is set to a suitable size, which can reduce the risk of short circuit between the positive and negative electrode sheets, and at the same time ensure the charging efficiency of the battery.

[0028] In the present exemplary embodiment, the distance d1 between the end of the negative electrode active material layer 222 in the first direction X and the end of the tab insulating layer 3 in the first direction X may be equal to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. The thickness of the battery case may be equal to 0.4 mm, 0.3 mm, 0.2 mm, etc. The battery case may be a steel case.

[0029] In this exemplary embodiment, Figure 1-4As shown, the tab insulation layer 3 also covers the end of the positive electrode sheet 21 close to the single-piece positive tab 24, and the dimension d2 of the tab insulation layer 3 covering the end of the positive electrode sheet 21 in the first direction X is 0.1mm-1mm. For example, d2 can be equal to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. If d2 is too large, the effective area of ​​the positive active material layer 212 is too small, and the energy density of the battery is too low; if d2 is too small, other structures of the battery are likely to transfer heat to the positive electrode sheet 21, thereby causing the positive active material layer 212 to be inactivated. At the same time, if d2 is too large, the tab also has the risk of inverted insertion of the tab. In this exemplary embodiment, d2 is set to a suitable size, which can not only ensure the energy density of the battery, but also reduce the risk of inactivation of the positive active material layer 212 and inverted insertion of the tab into the tab.

[0030] In this exemplary embodiment, Figure 1-4 As shown, in the first direction X, the dimension d3 of the tab insulation layer 3 beyond the negative electrode current collector layer 221 is 0.05mm-1mm. For example, d3 can be equal to 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. If d3 is too large, it is difficult for the negative electrode sheet 22 to absorb heat from other structures such as the positive electrode sheet 21, which will affect the charging efficiency of the battery; if d3 is too small, there is a risk of short circuit between the positive and negative electrode sheets. In this exemplary embodiment, d3 is set to a suitable size, which can not only ensure the charging efficiency of the battery, but also reduce the risk of short circuit between the positive and negative electrode sheets.

[0031] In this exemplary embodiment, the tab insulation layer 3 can be arranged on two opposite sides of the monolithic positive tab 24. The tab insulation layer 3 can be used to insulate the monolithic positive tab 24 and the negative tab 22. The tab insulation layer 3 located on two opposite sides of the monolithic positive tab 24 can effectively reduce the risk of short circuit between the positive and negative tabs of the battery. The tab insulation layer 3 affects the heat transfer between the tab and the battery case. When the tab insulation layer 3 is arranged on two opposite sides of the monolithic positive tab 24, the battery case can be appropriately thinned to dissipate heat from the battery cell. The thickness of the battery case is 0.1mm-0.35mm. For example, the thickness of the battery case can be equal to 0.1mm, 0.2mm, 0.3mm, 0.35mm, etc.

[0032] In this exemplary embodiment, Figure 1-4As shown, the ratio of the thickness of the tab insulation layer 3 to the thickness of the battery shell is 0.0025-0.1. For example, the ratio of the thickness of the tab insulation layer 3 to the thickness of the battery shell is equal to 0.0025, 0.005, 0.0075, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, etc. The ratio of the thickness of the tab insulation layer 3 to the thickness of the battery shell is too large. If the thickness of the tab insulation layer 3 is too large, the tab insulation layer 3 will occupy a large space inside the battery shell, thereby affecting the energy density of the battery; if the thickness of the tab insulation layer 3 is too small, the tab insulation layer 3 is easily damaged, and there is a risk of failure of the tab insulation layer 3. At the same time, if the ratio of the thickness of the tab insulation layer 3 to the thickness of the battery shell is too small, the thickness of the tab insulation layer 3 is too small, and other battery structures are easy to conduct heat to the positive electrode sheet through the tab insulation layer 3, thereby easily causing the positive electrode active material layer 212 to be deactivated. In this exemplary embodiment, the ratio of the thickness of the tab insulation layer 3 to the thickness of the battery shell is set to a suitable size, which can not only ensure the energy density of the battery, but also reduce the risk of failure of the tab insulation layer 3 and deactivation of the positive electrode active material layer 212.

[0033] In this exemplary embodiment, Figure 1-4 As shown, the dimension d4 of the tab insulation layer 3 in the first direction X is 0.8 mm-2 mm. For example, d4 can be equal to 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. If d4 is too small, there is a risk of short circuit between the positive and negative electrode sheets; if d4 is too large, the heat dissipation efficiency of the positive electrode sheet 21 is low, and the positive electrode active material layer 212 is prone to failure. In this exemplary embodiment, d4 is set to a suitable size, which can reduce the risk of short circuit between the positive and negative electrode sheets, and also reduce the risk of deactivation of the positive electrode active material layer 212.

[0034] In this exemplary embodiment, Figure 1-4As shown, the battery cell 2 also includes a separator 23 located between the positive electrode sheet 21 and the negative electrode sheet 22. The battery can be a lithium-ion battery, and the positive electrode active material of the lithium-ion battery can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode active material can be graphite, silicon, etc. The positive electrode collector layer can be aluminum foil, and the negative electrode collector layer can be copper foil. During charging, lithium ions are separated from the positive electrode active material layer, and move to the negative electrode active material layer through the electrolyte. The lithium ions are embedded in the interlayer gaps of the carbon material to complete the battery charging process. During discharge, lithium ions are separated from the negative electrode active material layer, and move to the positive electrode active material layer through the electrolyte to complete the battery discharge process. However, if the negative electrode active material layer does not have a position to accept lithium ions, lithium ions will precipitate on the surface of the negative electrode active material layer to form lithium dendrites, which can easily pierce the separator and cause the battery to short-circuit.

[0035] In this exemplary embodiment, Figure 1-4 As shown, the positive electrode sheet 21 includes a positive electrode current collector layer 211 and a positive electrode active material layer 212 located on at least one side of the positive electrode current collector layer 211, and the negative electrode active material layer 222 is arranged beyond the positive electrode active material layer 212 in the first direction X. This arrangement can reduce the risk of lithium deposition in the negative electrode sheet 22.

[0036] In the present exemplary embodiment, the dimension d5 of the negative electrode active material layer 222 beyond the positive electrode active material layer 212 in the first direction X is 0.55 mm-2.5 mm. For example, d5 may be equal to 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, 0.95 mm, 1.05 mm, 1.15 mm, 1.25 mm, 1.35 mm, 1.45 mm, 1.55 mm, 1.65 mm, 1.75 mm, 1.85 mm, 1.95 mm, 2.05 mm, 2.15 mm, 2.25 mm, 2.35 mm, 2.45 mm, 2.5 mm, etc. If the dimension of the negative electrode active material layer 222 beyond the positive electrode active material layer 212 in the first direction X is too large, the energy density of the battery is too low; if the dimension of the negative electrode active material layer 222 beyond the positive electrode active material layer 212 in the first direction X is too small, there is still a risk of lithium deposition on the negative electrode sheet 22. In this exemplary embodiment, the negative electrode active material layer 222 is set to a suitable size beyond the positive electrode active material layer 212 in the first direction X. This setting can ensure the energy density of the battery and reduce the risk of lithium deposition in the negative electrode sheet 22.

[0037] In this exemplary embodiment, the thermal conductivity of the battery housing 1 is greater than or equal to 15w / (m·k). For example, the thermal conductivity of the battery housing 1 can be equal to 15w / (m·k), 20w / (m·k), 25w / (m·k), 30w / (m·k), 35w / (m·k), 40w / (m·k), 45w / (m·k), 50w / (m·k), etc. In this exemplary embodiment, the thermal conductivity of the battery housing 1 is set to a larger value, which can increase the heat conduction rate of the battery cell and the outside of the battery, so that the temperature of the battery cell can be adjusted by the external temperature control structure of the battery. In this exemplary embodiment, the steel shell can be made of stainless steel, carbon steel, etc.

[0038] In this exemplary embodiment, the thickness of the battery housing 1 is 0.1mm-0.4mm. For example, the thickness of the battery housing 1 can be equal to 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc. If the thickness of the battery housing 1 is too small, the strength of the battery housing 1 is weak, and the battery housing 1 is easily deformed; if the thickness of the battery housing 1 is too large, the battery housing 1 will occupy a larger space inside the battery housing, which will result in a lower energy density of the battery. In this exemplary embodiment, the thickness of the battery housing 1 is set to a suitable size, which can not only ensure the energy density of the battery, but also improve the overall strength of the battery housing.

[0039] In this exemplary embodiment, Figure 1-4 As shown, the battery cell 2 also includes a single negative electrode ear 25, and the single negative electrode ear 25 and the single positive electrode ear 24 are led out from the same end of the battery cell 2. There are multiple single negative electrode ears 25, and the multiple single negative electrode ears 25 can form a negative electrode ear with an integrated structure after being gathered; there are multiple single positive electrode ears 24, and the multiple single positive electrode ears 24 can form a positive electrode ear with an integrated structure after being gathered. In this exemplary embodiment, the single negative electrode ear 25 and the single positive electrode ear 24 are led out from the same end of the battery cell 2. This setting can reduce the space occupied by the single negative electrode ear 25 and the single positive electrode ear 24 in the battery housing, thereby improving the energy density of the battery. When the single negative electrode ear 25 and the single positive electrode ear 24 are led out from the same end of the battery cell 2, the positive and negative electrodes are easily short-circuited, and accordingly, d1 can be set larger. A distance d1 between an end of the negative electrode active material layer 222 in the first direction X and an end of the tab insulating layer 3 in the first direction X may be greater than 0.12 mm. For example, d1 may be equal to 0.121 mm, 0.13 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0040] In this exemplary embodiment, Figure 1-4As shown, the battery cell 2 further includes a single negative electrode ear 25, and the single negative electrode ear 25 and the single positive electrode ear 24 are led out from the same end of the battery cell 2; the distance d1 between the end of the negative electrode active material layer 222 in the first direction X and the end of the ear insulation layer 3 in the first direction X is 0.12mm-2mm, for example, d1 can be equal to 0.12mm, 0.13mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. The thickness of the battery housing 1 is ≤0.38mm, for example, the thickness of the battery housing 1 can be equal to 0.38mm, 0.3mm, 0.2mm, 0.1mm, etc. The current transmission of the positive and negative tabs led out from the same end is concentrated at one end, and the heat generation area is concentrated, thereby reducing the shell thickness and meeting the demand for rapid heat transfer between the battery cell and the battery shell; after being led out on the same side, the size of the tab is relatively small, the tab width is shorter, and the positive tab and the negative electrode sheet are more likely to overlap during the contraction process. By increasing the height of the tab insulation layer, that is, increasing the distance between the end of the tab insulation layer and the negative electrode active material, it can be ensured that the positive tab and the negative electrode sheet will not overlap. Therefore, this setting can reduce the risk of overlapping and short-circuiting the negative electrode sheet after the tab is inverted.

[0041] In this exemplary embodiment, the single positive electrode ear 24 is connected to the positive electrode collector layer in the positive electrode sheet, for example, the single positive electrode ear 24 can be formed by cutting the positive electrode collector material layer; the single negative electrode ear 25 is connected to the negative electrode collector layer in the negative electrode sheet, for example, the single negative electrode ear 25 can be formed by cutting the negative electrode collector material layer. It should be understood that in other exemplary embodiments, the single positive electrode ear 24 and the positive electrode collector layer 211 can be separate structures, for example, the single positive electrode ear 24 can be welded to the positive electrode collector layer 211; similarly, the single negative electrode ear 25 and the negative electrode collector layer 221 can be separate structures, for example, the single negative electrode ear 25 can be welded to the negative electrode collector layer 221.

[0042] In this exemplary embodiment, the negative electrode current collector layer 221 may be only partially coated with the negative electrode active material layer, and the positive electrode current collector layer 211 may also be only partially coated with the positive electrode active material layer 212. It should be understood that in other exemplary embodiments, the negative electrode current collector layer 221 may be coated with the negative electrode active material layer on the entire surface, and the positive electrode current collector layer 211 may be coated with the positive electrode active material layer on the entire surface. In addition, the negative electrode active material layer 222 may be coated on one side or both layers of the negative electrode current collector layer 221, and the positive electrode active material layer 212 may also be coated on one side or both layers of the positive electrode current collector layer 211.

[0043] In this exemplary embodiment, the tab insulation layer 3 may be a tab glue, and the tab insulation layer 3 may be a mixture of polyvinylidene fluoride (PVDF) and boehmite.

[0044] In this exemplary embodiment, the battery may be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, or the like.

[0045] In this exemplary embodiment, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0046] In other exemplary embodiments, the battery may also be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and may be arc transitions.

[0047] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0048] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0049] This exemplary embodiment also provides a battery device, which includes the above-mentioned battery, and the battery device is a battery module or a battery pack.

[0050] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0051] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0052] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0053] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0054] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0055] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: The battery comprises: A battery housing (1), the battery housing (1) comprising steel; A battery cell (2), at least partly located in the battery housing (1), the battery cell (2) comprising a stacked positive electrode sheet (21), a negative electrode sheet (22), and a single positive electrode tab (24), the single positive electrode tab (24) being connected to one side of the positive electrode sheet (21) in a first direction (X), the negative electrode sheet (22) comprising a negative electrode current collector layer (221) and a negative electrode active material layer (222) located on at least one side of the negative electrode current collector layer (221); A tab insulation layer (3), the tab insulation layer (3) being arranged on at least one side of the single-piece positive tab (24), and the tab insulation layer (3) at least covers an end portion of the single-piece positive tab (24) close to the positive electrode sheet (21); The tab insulation layer (3) is arranged beyond the negative electrode active material layer (222) in the first direction (X), and the distance (d1) between the end of the negative electrode active material layer (222) in the first direction (X) and the end of the tab insulation layer (3) in the first direction (X) is 0.1 mm-2 mm, and the thickness of the battery housing (1) is ≤0.4 mm.

2. The battery according to claim 1, characterized in that The tab insulation layer (3) also covers the end of the positive electrode sheet (21) close to the single-piece positive tab (24), and the dimension (d2) of the tab insulation layer (3) covering the end of the positive electrode sheet (21) in the first direction (X) is 0.1 mm-1 mm.

3. The battery according to claim 1, characterized in that In the first direction (X), the dimension (d3) of the tab insulation layer (3) beyond the negative electrode current collector layer (221) is 0.05 mm to 1 mm.

4. The battery according to claim 1, characterized in that The tab insulation layer (3) is arranged on two opposite side surfaces of the single-piece positive tab (24), and the thickness of the battery housing (1) is 0.1 mm-0.35 mm.

5. The battery according to claim 1, characterized in that The ratio of the thickness of the tab insulation layer (3) to the thickness of the battery casing (1) is 0.0025-0.

1.

6. The battery according to claim 1, characterized in that The dimension (d4) of the tab insulation layer (3) in the first direction (X) is 0.8 mm to 2 mm.

7. The battery according to any one of claims 1 to 6, characterized in that: The positive electrode sheet (21) comprises a positive electrode current collector layer (211) and a positive electrode active material layer (212) located on at least one side of the positive electrode current collector layer (211); the negative electrode active material layer (222) is arranged beyond the positive electrode active material layer (212) in the first direction (X); and the dimension (d5) of the negative electrode active material layer (222) exceeding the positive electrode active material layer (212) in the first direction (X) is 0.55 mm-2.5 mm.

8. The battery according to any one of claims 1 to 6, characterized in that: The thermal conductivity of the battery casing (1) is greater than or equal to 15w / (m·k).

9. The battery according to any one of claims 1 to 6, characterized in that: The battery cell (2) further comprises a single negative electrode tab (25), wherein the single negative electrode tab (25) and the single positive electrode tab (24) are led out from the same end of the battery cell (2), and a distance (d1) between an end of the negative electrode active material layer (222) in the first direction (X) and an end of the tab insulation layer (3) in the first direction (X) is greater than 0.12 mm.

10. The battery according to any one of claims 1 to 6, characterized in that: The battery cell (2) further comprises a single-piece negative electrode ear (25), wherein the single-piece negative electrode ear (25) and the single-piece positive electrode ear (24) are led out from the same end of the battery cell (2); The distance (d1) between the end of the negative electrode active material layer (222) in the first direction (X) and the end of the tab insulation layer (3) in the first direction (X) is 0.12 mm-2 mm, and the thickness of the battery housing (1) is ≤0.38 mm.

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