Battery and electric equipment

Abstract

The invention relates to a battery and electric equipment. The battery comprises a plurality of battery units, each battery unit comprises a plurality of battery monomers, the plurality of battery monomers are stacked along a first direction, and the surface of each battery monomer is coated with an insulating layer; each battery monomer comprises a first large side surface and a second large side surface which are oppositely arranged along a first direction, and a first small side surface and a second small side surface which are arranged along a second direction, the areas of the first large side surface and the second large side surface are larger than those of the first small side surface and the second small side surface, the first direction is vertical to the second direction, and the first direction is a vertical direction; the surface of the first large side surface is coated with an insulating layer, the surface of the second large side surface is not coated with an insulating layer, and the first large side surface of one of two adjacent battery monomers in the first direction abuts against the second large side surface of the other battery monomer. According to the arrangement of the battery structure, the number of layers of the whole insulating film of the battery can be remarkably reduced, the space utilization rate is optimized, and the volume energy density of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] With the widespread adoption of new energy vehicles and portable electronic products, battery technology research and innovation have become a key focus in current science and technology. In the field of lithium batteries, in particular, increasing energy density has always been a key factor in improving battery performance. Currently, battery cells typically adopt a square shell design with an insulating film coated on the surface to prevent short circuits between battery cells. However, as the battery cells are arranged more compactly within the battery pack, the isolation layer between adjacent battery cells also increases, resulting in a decrease in the overall space utilization efficiency of the battery system, thereby affecting the battery's energy density.

[0003] In related technologies, the arrangement of battery cells is often optimized to reduce wasted space between cells. For example, a compact arrangement, such as a honeycomb structure or other more compact geometric shapes, is used to reduce the gaps between cells, thereby increasing the overall energy density.

[0004] However, in related technologies, although the use of a compactly arranged battery cell structure can effectively reduce gaps, this approach may make it difficult to dissipate heat within the battery pack, thereby affecting the battery's heat dissipation performance, and may further reduce the battery's cycle life and stability. Summary of the Invention

[0005] Based on this, it is necessary to address the above technical problems and provide a battery and electrical equipment that can reduce the space occupied by the insulating film and thus increase the energy density.

[0006] In a first aspect, the present application provides a battery, comprising:

[0007] A plurality of battery units, each battery unit comprising a plurality of battery cells, the plurality of battery cells being stacked along a first direction, and a surface of each battery cell being coated with an insulating layer;

[0008] Each battery cell includes a first large side surface and a second large side surface arranged opposite to each other along a first direction, and a first small side surface and a second small side surface arranged along a second direction, wherein the first large side surface and the second large side surface are larger in area than the first small side surface and the second small side surface, and the first direction is perpendicular to the second direction, and the first direction is a vertical direction;

[0009] The surface of the first large side surface is covered with an insulating layer, the surface of the second large side surface is not covered with an insulating layer, and the first large side surface of one of the two battery cells adjacent to each other along the first direction abuts against the second large side surface of the other battery cell.

[0010] In one embodiment, each battery cell further includes a bottom surface, a first large side surface, a first small side surface, a second large side surface, and a second small side surface are sequentially connected to form a columnar structure, and the first large side surface, the first small side surface, the second large side surface, and the second small side surface are respectively connected to one side of the bottom surface;

[0011] The surface of the first small side surface, the surface of the second small side surface and the surface of the bottom surface are all covered with an insulating layer.

[0012] In one embodiment, when the plurality of battery cells are distributed along the second direction, the first small side surface of the battery cell of one of the two adjacent battery cells abuts against the second small side surface of the battery cell of the other battery cell.

[0013] In one embodiment, multiple groups of battery cells are arranged along the second direction to form a row of battery cells. The battery cells are arranged in multiple rows, and the bottom surfaces of the battery cells between two adjacent rows of battery cells are arranged opposite to each other. The battery cells in two adjacent rows are arranged at intervals or adjacent to each other.

[0014] In one embodiment, the closing structure of the insulating layer covering the battery cell is arranged on the bottom surface of the battery cell.

[0015] In one embodiment, the battery cells are arranged in multiple rows, and the bottom surfaces of the battery cells in the battery cells face the same direction. The closing structure of the insulation layer covering the battery cells is arranged on the first small side surface and the second small side surface of the battery cells.

[0016] In one embodiment, the insulating layer includes a coated stacking surface, a coated side surface and a coated bottom surface, the coated stacking surface is coated on the surface of the first large side surface, the surface of the first small side surface and the surface of the second small side surface are both coated with the coated side surface, and the coated bottom surface is at least partially coated on the bottom surface.

[0017] In one embodiment, the covering stacking surface, the covering side surface and the covering bottom surface are an integrated structure, a covering side surface is provided on each side of the covering stacking surface, a folding line is provided between the covering stacking surface and the covering side surface, and the covering bottom surface includes a first covering layer, a second covering layer and a third covering layer;

[0018] Among them, the first covering layer, the second covering layer and the third covering layer are an integrated structure, a folding line is set between the first covering layer and the second covering layer, a folding line is set between the second covering layer and the third covering layer, a folding line is set between the second covering layer and the covering stacking surface, and the first covering layer and the third covering layer are not connected to the covering side surface.

[0019] In one embodiment, the covering stacking surface, the covering side surface and the covering bottom surface are an integrated structure, a covering side surface is provided on each side of the covering stacking surface, a folding line is provided between the covering stacking surface and the covering side surface, and the covering bottom surface includes a first covering layer, a second covering layer and a third covering layer;

[0020] Among them, the first cladding layer and the third cladding layer are respectively connected to a cladding side and are provided with a folding line, a folding line is provided between the second cladding layer and the cladding stacking surface, the first cladding layer is not connected to the second cladding layer, and the second cladding layer is not connected to the third cladding layer.

[0021] In a second aspect, the present application provides an electrical device, which includes a battery as described in any of the above embodiments.

[0022] The above-mentioned battery and electrical equipment form a lying battery by stacking multiple battery cells along a first direction, the surface of each battery cell is covered with an insulating layer, and only one layer of insulating film is provided between two adjacent battery cells, which significantly reduces the number of layers of insulating film of the entire battery, thereby optimizing the space utilization of the battery as a whole in the height direction; and by reducing the number of insulating layers between battery cells, the internal space of the battery cell in the height direction of each battery unit can be effectively increased, and more layers of pole pieces can be placed in the battery cell, thereby increasing the volume energy density of the battery cell, thereby increasing the volume energy density of the battery as a whole; at the same time, by closely contacting the first largest side surface of a battery cell with the second largest side surface of another battery cell, space waste is further reduced, the stability of the battery cell is enhanced, and not only the energy density of the battery can be increased, but also the thermal management effect of the battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is one of the structural schematic diagrams of a battery cell provided in one embodiment of the present application;

[0025] Figure 2 This is a second structural diagram of a battery cell provided in one embodiment of the present application;

[0026] Figure 3 A schematic structural diagram of a battery unit provided in one embodiment of the present application;

[0027] Figure 4A schematic structural diagram of an insulating layer provided in one embodiment of the present application;

[0028] Figure 5 A schematic structural diagram of an insulating layer provided in another embodiment of the present application.

[0029] Description of reference numerals:

[0030] 10-battery unit, 20-insulation layer;

[0031] 110-battery monomer;

[0032] 111- first large side surface, 112- second large side surface, 113- first small side surface, 114- second small side surface, 115- bottom surface;

[0033] 210 - covered stacking surface, 220 - covered side surface, 230 - covered bottom surface, 240 - folding line;

[0034] 231 - first cladding layer, 232 - second cladding layer, 233 - third cladding layer. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does 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 this application.

[0037] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0041] The applicant has noticed that when multiple battery cells are assembled into a battery pack, the conductivity of the metal shell may cause adjacent cells to contact, resulting in a short circuit, which in turn causes safety issues such as internal short circuits in the battery pack. In order to prevent this risk, an insulating layer is usually covered on the outer surface of each battery cell to avoid conductive contact between battery cells. When the battery cells are arranged, in order to ensure their safe isolation, a double-layer insulating film is usually required to effectively prevent short circuits. Although this measure can significantly improve safety, it also occupies part of the space in the battery pack, limiting the space utilization of the battery pack, thereby affecting the overall energy density.

[0042] Based on the above situation, in order to avoid the situation where the insulating film takes up too much space and thus affects the energy density, a battery is provided. The battery includes a plurality of battery cells 10, each of which includes a plurality of battery cells 110. The plurality of battery cells 110 are stacked along a first direction, and the surface of each battery cell 110 is covered with an insulating layer 20. Figure 1 and Figure 2 , Figure 1 A perspective of a structural diagram of a battery cell 110 provided in an embodiment of the present application is provided. Figure 2 Another perspective of the structural schematic diagram of a battery cell 110 provided in an embodiment of the present application is provided. Each battery cell 110 includes a first large side surface 111 and a second large side surface 112 distributed along a first direction, and the first large side surface 111 and the second large side surface 112 are arranged opposite each other. Each battery cell 110 also includes a first small side surface 113 and a second small side surface 114 arranged opposite each other along a second direction, wherein the first large side surface 111 and the second large side surface 112 have a larger area than the first small side surface 113 and the second small side surface 114. The surface of the first large side surface 111 is covered with an insulating layer 20, and the surface of the second large side surface 112 is not covered with the insulating layer 20.

[0043] Specifically, the plurality of battery cells 110 in the battery unit 10 are stacked along a first direction, and the thickness direction of the battery cells 110 is the first direction, and the length direction of the battery cells 110 in the battery unit 10 is the second direction.

[0044] In the stacked battery unit 10 , the first large side surface 111 of one of the two adjacent battery cells 110 faces and abuts against the second large side surface 112 of the other battery cell 110 .

[0045] The surface of each battery cell 110 is covered with an insulating layer 20. The main function of the insulating layer 20 is to prevent the battery cell 110 from short-circuiting during operation, thereby ensuring the safety and stability of the battery. The surface of the first large side surface 111 is covered with the insulating layer 20, while the surface of the second large side surface 112 is not covered with the insulating layer 20. As a result, in the battery unit 10 composed of stacked battery cells 110, two adjacent battery cells 110 can contact each other through their first large side surface 111 and second large side surface 112 and form a tight connection. This stacking structure not only helps save space, but also improves the conductivity efficiency between battery cells 110 while ensuring safety. The first large side surface 111 coated with the insulating layer 20 can prevent accidental short circuits and ensure the safety of each battery cell 110 in the entire battery unit 10.

[0046] In the above-mentioned battery, a lying battery is formed by stacking multiple battery cells 110 along a first direction, the surface of each battery cell 110 is covered with an insulating layer 20, and only one layer of insulating film is provided between two adjacent battery cells 110, which significantly reduces the number of layers of the insulating film of the entire battery, thereby optimizing the space utilization of the battery as a whole in the height direction; and by reducing the number of insulating layers 20 between the battery cells 110, the internal space of the battery cell 110 in the height direction of each battery unit 10 can be effectively increased, and more layers of pole pieces can be placed in the battery cell, thereby increasing the volume energy density of the battery cell, thereby increasing the volume energy density of the battery as a whole; at the same time, by closely contacting the first large side surface 111 of one battery cell 110 with the second large side surface 112 of another battery cell 110, space waste is further reduced, the stability of the battery unit 10 is enhanced, and not only the energy density of the battery can be increased, but also the thermal management effect of the battery can be improved.

[0047] Continue reading Figure 1 and Figure 2 Each battery cell 110 further includes a bottom surface 115. A first large side surface 111, a first small side surface 113, a second large side surface 112, and a second small side surface 114 are sequentially connected to form a cylindrical structure. The first large side surface 111, the first small side surface 113, the second large side surface 112, and the second small side surface 114 are respectively connected to one side of the bottom surface 115. The surfaces of the first small side surface 113, the second small side surface 114, and the bottom surface 115 are all covered with an insulating layer 20.

[0048] Each surface of the battery cell 110 is coated with an insulating layer 20, especially the surfaces of the first small side surface 113, the second small side surface 114 and the bottom surface 115, all of which are coated with an insulating layer 20. The main function of the insulating layer 20 is to prevent the battery cell 110 from current leakage or short circuit during use. Specifically, the surfaces of the first small side surface 113 and the second small side surface 114 are effectively isolated from external electrical interference or potential electrical contact risks by being coated with the insulating layer 20. The bottom surface 115 is further enhanced in its anti-interference ability by being coated with the insulating layer 20, thereby ensuring the electrical stability of the battery cell 110 during operation.

[0049] See Figure 3 , Figure 3 A structural schematic diagram of a battery cell 10 provided in an embodiment of the present application is shown. When multiple battery cells 10 are distributed along the second direction, the first small side surface 113 of the battery cell 110 of one battery cell 10 of two adjacent battery cells 10 abuts against the second small side surface 114 of the battery cell 110 of the other battery cell 10.

[0050] In two adjacent battery cells 10, the first small side surface 113 of one battery cell 110 abuts the second small side surface 114 of the other battery cell 110, ensuring efficient connection and stability between the battery cells 110. Specifically, the abutment between the first small side surface 113 and the second small side surface 114 of the battery cells 110 forms a strong contact surface, which can effectively reduce the gap between the battery cells 10, thereby improving the compactness and structural strength of the battery system. This not only helps to enhance the electrical contact of the battery cells 10, but also optimizes heat conduction between the batteries, ensuring the stability and efficiency of the battery system during long-term operation.

[0051] At the same time, the contact surface between the first small side surface 113 and the second small side surface 114 is coated with an insulating layer 20, further ensuring that electrical short circuits or unnecessary current leakage between the battery cells 110 will not occur. This balances electrical safety and conductivity, improving the connection efficiency of the battery cells 10 while avoiding potential safety hazards caused by poor contact.

[0052] Continue reading Figure 3 Multiple groups of battery cells 10 are arranged along the second direction to form a row of battery cells. Multiple rows of battery cells 10 are provided, with the bottom surfaces 115 of the battery cells 110 between two adjacent rows of battery cells 10 facing each other. Adjacent rows of battery cells 10 are spaced apart or adjacent to each other. In one embodiment, the closing structure of the insulating layer 20 covering the battery cells 110 is provided on the bottom surface 115 of the battery cells 110.

[0053] In a preferred embodiment, when two rows of battery cells 110 are arranged at intervals, the closing structure of the insulating layer 20 covering the battery cells 110 is arranged on the bottom surface 115 of the battery cells 110 .

[0054] When two rows of battery cells 110 are spaced apart, the closing structure of the insulating layer 20 covering the battery cells 110 is located on the bottom surface 115 of the battery cells 110, fully considering the safety and stability of the battery. The bottom surface 115, as the contact surface of the battery cells 110, is usually the part most susceptible to external influences. Placing the closing structure of the insulating layer 20 here can effectively prevent the bottom surface 115 of the battery cells 110 from electrical contact or short circuiting with the outside world, thereby enhancing the safety of the battery system. Furthermore, the closing structure of the insulating layer 20 on the bottom surface 115 ensures a stable vertical connection between the battery cells 110.

[0055] Continue reading Figure 3 The battery cells 10 are arranged in multiple rows, and the bottom surfaces 115 of the battery cells 110 in the battery cells 10 face the same direction. The closing structure of the insulating layer 20 covering the battery cells 110 is arranged on the first small side surface 113 and the second small side surface 114 of the battery cells 110.

[0056] In order to ensure the safety and electrical isolation of the battery cells 110, the closing structure of the insulating layer 20 covering the battery cells 110 is arranged on the first small side surface 113 and the second small side surface 114 of the battery cells 110, which can effectively prevent electrical short circuits or poor contact between the battery cells 110, especially in the connection and contact parts between the battery cells 110. In addition, the closing structure of the insulating layer 20 on the first small side surface 113 and the second small side surface 114 can ensure the electrical isolation between the battery cells 110, while preventing the battery cells 110 from being affected by the external environment or other battery cells 110 during use, thereby enhancing the safety of the system. At the same time, the closing structure arranged on the side of the battery cell 110 also helps to improve the mechanical stability and impact resistance of the battery cell 110.

[0057] In some embodiments, the insulating layer 20 includes a coated stacking surface 210, a coated side surface 220 and a coated bottom surface 230, the coated stacking surface 210 is coated on the surface of the first large side surface 111, the surface of the first small side surface 113 and the surface of the second small side surface 114 are both coated with the coated side surface 220, and the coated bottom surface 230 is at least partially coated on the bottom surface 115.

[0058] See Figure 4 , Figure 4The schematic diagram of the structure of the insulating layer 20 provided in one embodiment of the present application is shown. The coating stacking surface 210, the coating side surface 220 and the coating bottom surface 230 are an integrated structure. A coating side surface 220 is provided on each side of the coating stacking surface 210. A folding line 240 is provided between the coating stacking surface 210 and the coating side surface 220. The coating bottom surface 230 includes a first coating layer 231, a second coating layer 232 and a third coating layer 233. Among them, the first coating layer 231, the second coating layer 232 and the third coating layer 233 are an integrated structure. A folding line 240 is provided between the first coating layer 231 and the second coating layer 232, a folding line 240 is provided between the second coating layer 232 and the third coating layer 233, and a folding line 240 is provided between the second coating layer 232 and the coating stacking surface 210. The first coating layer 231 and the third coating layer 233 are not connected to the coating side surface 220. Among them, Figure 4 The middle dotted line is the cutting line.

[0059] The stacking surface 210, side surfaces 220, and bottom surface 230 utilize an integrated structure, ensuring that the intersections between adjacent battery cell surfaces are effectively covered, effectively enhancing the overall stability and safety of the battery cell 110. Side surfaces 220 are positioned on either side of the stacking surface 210, and the stacking surface 210 and side surfaces 220 are connected by fold lines 240, ensuring structural tightness and adjustability. This not only aids in assembly accuracy during the manufacturing process but also enhances the mechanical strength of the battery cell 110 to a certain extent, reducing the impact of external shocks on the battery.

[0060] In the battery cell 110, the second covering layer 232 in the covering bottom surface 230 is covered on the bottom surface 115, and the first covering layer 231 and the third covering layer 233 are bent along the folding line 240 between the second covering layer and covered on the first small side surface 113 and the second small side surface 114, respectively, overlapping with the covering side surfaces 220 on the first small side surface 113 and the second small side surface 114, forming a closing structure on the first small side surface 113 and the second small side surface 114.

[0061] participate Figure 5 , Figure 5The structure of the insulating layer 20 provided in another embodiment of the present application is shown. The cladding stacking surface 210, the cladding side surface 220, and the cladding bottom surface 230 are integrated. A cladding side surface 220 is provided on each side of the cladding stacking surface 210. A folding line 240 is provided between the cladding stacking surface 210 and the cladding side surface 220. The cladding bottom surface 230 includes a first cladding layer 231, a second cladding layer 232, and a third cladding layer 233. The first cladding layer 231 and the third cladding layer 233 are each connected to a cladding side surface 220 and provided with a folding line 240. The second cladding layer 232 is provided with a folding line 240 and the cladding stacking surface 210. The first cladding layer 231 is not connected to the second cladding layer 232, and the second cladding layer 232 is not connected to the third cladding layer 233.

[0062] The cladding side surfaces 220 are provided on both sides of the cladding stacking surface 210, and the cladding stacking surface 210 and the cladding side surfaces 220 are connected by folding lines 240, forming a compact and flexible structure. This not only facilitates assembly during the production process, but also effectively absorbs impact force under external force, thereby improving the compressive resistance of the battery cell 110. The first cladding layer 231 and the third cladding layer 233 are respectively connected to the cladding side surfaces 220, and are provided with folding lines 240, which can ensure that the connection between the cladding side surfaces 220 and the underlying structure is more secure. Figure 5 The middle dotted line is the cutting line.

[0063] In the battery cell 110, the second covering layer 232 in the covering bottom surface 230 is covered on the bottom surface 115, and the first covering layer 231 and the third covering layer 233 are respectively bent along the folding lines 240 corresponding to the covering side surfaces 220, covered on the bottom surface 115, and overlapped with the second covering layer 232 to form a closing structure on the bottom surface 115.

[0064] In an exemplary embodiment, the present application further provides an electrical device, which includes the battery as described in any of the above embodiments.

[0065] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. The schematic descriptions of these terms throughout this specification do not necessarily refer to the same embodiment or example.

[0066] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery, characterized in that: include: A plurality of battery units, each of the battery units comprising a plurality of battery cells, the plurality of battery cells being stacked along a first direction, and a surface of each battery cell being coated with an insulating layer; Each of the battery cells includes a first large side surface and a second large side surface arranged opposite to each other along the first direction, and a first small side surface and a second small side surface arranged along the second direction, wherein the first large side surface and the second large side surface are larger in area than the first small side surface and the second small side surface, and the first direction is perpendicular to the second direction, and the first direction is a vertical direction; The surface of the first large side surface is covered with an insulating layer, the surface of the second large side surface is not covered with the insulating layer, and the first large side surface of one of the two battery cells adjacent to each other along the first direction abuts against the second large side surface of the other battery cell.

2. The battery according to claim 1, characterized in that Each of the battery cells further comprises a bottom surface, wherein the first large side surface, the first small side surface, the second large side surface, and the second small side surface are sequentially connected to form a columnar structure, and the first large side surface, the first small side surface, the second large side surface, and the second small side surface are respectively connected to one side of the bottom surface; The surface of the first small side surface, the surface of the second small side surface and the surface of the bottom surface are all covered with an insulating layer.

3. The battery according to claim 2, characterized in that In the case where the plurality of battery cells are distributed along the second direction, the first small side surface of the battery cell of one of the two adjacent battery cells abuts against the second small side surface of the battery cell of the other battery cell.

4. The battery according to claim 3, characterized in that Multiple groups of battery cells are arranged along the second direction to form a row of battery cells. The battery cells are arranged in multiple rows, and the bottom surfaces of the battery cells between two rows of battery cells are arranged oppositely. The battery cells in two adjacent rows are arranged at intervals or adjacently.

5. The battery according to claim 4, characterized in that The closing structure of the insulating layer covering the battery cell is arranged on the bottom surface of the battery cell.

6. The battery according to claim 3, characterized in that The battery cells are arranged in multiple rows, and the bottom surfaces of the battery cells in the battery cells face the same direction. The closing structure of the insulation layer covering the battery cells is arranged on the first small side surface and the second small side surface of the battery cells.

7. The battery according to claim 2, characterized in that The insulating layer includes a covering stacking surface, a covering side surface and a covering bottom surface. The covering stacking surface is covered on the surface of the first large side surface, the surface of the first small side surface and the surface of the second small side surface are both covered with the covering side surface, and the covering bottom surface is at least partially covered on the bottom surface.

8. The battery according to claim 7, characterized in that The cladding stacking surface, the cladding side surface and the cladding bottom surface are an integrated structure, one cladding side surface is provided on each side of the cladding stacking surface, a folding line is provided between the cladding stacking surface and the cladding side surface, and the cladding bottom surface includes a first cladding layer, a second cladding layer and a third cladding layer; Among them, the first covering layer, the second covering layer and the third covering layer are an integrated structure, a folding line is provided between the first covering layer and the second covering layer, a folding line is provided between the second covering layer and the third covering layer, a folding line is provided between the second covering layer and the covering stacking surface, and the first covering layer and the third covering layer are not connected to the covering side surface.

9. The battery according to claim 7, characterized in that The cladding stacking surface, the cladding side surface and the cladding bottom surface are an integrated structure, one cladding side surface is provided on each side of the cladding stacking surface, a folding line is provided between the cladding stacking surface and the cladding side surface, and the cladding bottom surface includes a first cladding layer, a second cladding layer and a third cladding layer; Among them, the first covering layer and the third covering layer are respectively connected to a covering side surface and are provided with a folding line, a folding line is provided between the second covering layer and the covering stacking surface, the first covering layer is not connected to the second covering layer, and the second covering layer is not connected to the third covering layer.

10. An electrical device, characterized in that: The electric device comprises the battery according to any one of claims 1 to 9, and the battery is used to provide electric energy.

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