Battery structure

Abstract

The embodiment of the present disclosure relates to the field of energy storage, and provides a battery structure, comprising: a battery body, the battery body comprising a first side and a second side which are opposite, and a third side and a fourth side which are opposite, the first side, the third side, the second side and the fourth side are sequentially connected, and the area of the first side is greater than the area of the third side; a first insulating film, the first insulating film covering at least the first side; and a second insulating film, the second insulating film covering at least the second side. The assembly difficulty of the battery structure can be reduced.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage, and in particular to a battery structure. Background Technology

[0002] With the widespread application of lithium battery energy storage technology, consumer terminals are placing increasingly higher demands on the energy efficiency and cost of energy storage systems. To improve system energy and further reduce costs, the mainstream design approach is to eliminate battery pack structural components and directly integrate the cells into the battery cluster. This not only allows for the inclusion of more cells, increasing system energy, but also reduces system material costs by eliminating battery pack structural components. Furthermore, developing ultra-large capacity (>700Ah) single lithium-ion cells can improve the system's volume utilization rate, further enhancing system energy. To meet these demands, large-size blade batteries have become a major development and application direction for lithium batteries. Firstly, the large-size battery body can serve as the battery pack shell structure for free assembly. Secondly, this cell technology can avoid the capacity bottleneck of wound cells, meeting the demand for larger cell capacities.

[0003] However, assembling large-sized battery modules presents challenges. Utility Model Content

[0004] This disclosure provides a battery structure that can at least reduce the difficulty of manufacturing the battery structure.

[0005] According to some embodiments of this disclosure, one aspect of this disclosure provides a battery structure, including: a battery body, the battery body including a first side and a second side facing each other, and a third side and a fourth side facing each other, the first side, the third side, the second side and the fourth side being connected sequentially, the area of ​​the first side being larger than the area of ​​the third side; a first insulating film, the first insulating film at least covering the first side; and a second insulating film, the second insulating film at least covering the second side.

[0006] In some embodiments, the first insulating film further extends to a portion of the surface of the third side and a portion of the surface of the fourth side.

[0007] In some embodiments, the second insulating film further extends to a portion of the surface of the third side and a portion of the surface of the fourth side.

[0008] In some embodiments, the first insulating film located on the third side partially overlaps with the second insulating film; and / or, the first insulating film located on the fourth side partially overlaps with the second insulating film.

[0009] In some embodiments, the edge of the first insulating film located on the third side is directly opposite and adjacent to the edge of the second insulating film; and / or, the edge of the first insulating film located on the fourth side is directly opposite and adjacent to the edge of the second insulating film.

[0010] In some embodiments, the width of the second insulating film extending to the surface of the third side surface in the direction from the third side surface to the fourth side surface is 12.5 mm to 25 mm.

[0011] In some embodiments, the width of the first insulating film extending to the surface of the third side surface in the direction from the third side surface to the fourth side surface is 12.5 mm to 25 mm.

[0012] In some embodiments, the third insulating film is further included, the third insulating film covering the third side surface.

[0013] In some embodiments, the fourth insulating film is further included, the fourth insulating film covering the fourth side surface.

[0014] In some embodiments, the battery body further includes a top surface and a bottom surface facing each other, wherein the top surface and the bottom surface are provided with electrode posts, and the difference between the length of the first insulating film and the length of the first side surface is 6mm to 20mm, and / or the difference between the length of the second insulating film and the length of the second side surface is 6mm to 20mm.

[0015] The technical solution provided in this disclosure has at least the following advantages: by using a first insulating film and a second insulating film to cover the first side and the second side respectively, the area covered by a single insulating film on the battery body is reduced, thereby improving the tightness of the fit between the first insulating film and the second insulating film and the battery body. At the same time, by using a first insulating film and a second insulating film to cover the first side and the second side respectively, the battery body does not need to be flipped when covering the surface of the battery body with the insulating film, thereby reducing the assembly difficulty of the battery structure. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1An exploded view of a battery structure provided in an embodiment of this disclosure;

[0018] Figure 2 A schematic diagram of a battery structure provided in an embodiment of this disclosure;

[0019] Figure 3 Another schematic diagram of the battery structure provided in one embodiment of this disclosure;

[0020] Figure 4 This is a schematic diagram of the structure of a battery body provided in an embodiment of the present disclosure. Detailed Implementation

[0021] Currently, battery bodies often suffer from poor appearance after the insulating film is applied, such as the presence of bubbles and wrinkles. This is because battery structures with terminals on both sides can only use a loop-shaped wrapping process. However, due to the large wrapping area and the continuous traction and unwinding of the blue film, the insulating blue film does not adhere tightly to the surface of the battery body. In addition, the large capacity battery body is heavy, making it difficult to flip the battery body during the loop-shaped wrapping process, which further reduces production efficiency.

[0022] In this embodiment of the present disclosure, a first insulating film and a second insulating film are used to cover the first side and the second side respectively, so as to reduce the area of ​​the battery body covered by a single insulating film, thereby improving the tightness of the adhesion between the first insulating film and the second insulating film and the battery body. At the same time, by using the first insulating film and the second insulating film to cover the first side and the second side respectively, the battery body does not need to be flipped when covering the surface of the battery body with the insulating film, thereby reducing the assembly difficulty of the battery structure.

[0023] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In the description of the embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0027] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0028] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0029] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0030] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0031] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description and claims of the various embodiments described, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] refer to Figures 1 to 4 , Figure 1 An exploded view of a battery structure provided in an embodiment of this disclosure; Figure 2 A schematic diagram of a battery structure provided in an embodiment of this disclosure; Figure 3 This is another schematic diagram of the battery structure provided in one embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of a battery body according to an embodiment of the present disclosure, wherein, Figure 2 The edges of the first insulating film and the second insulating film are directly opposite and adjacent. Figure 3 This is a schematic diagram showing the structure where the first insulating film and the second insulating film partially overlap.

[0034] In some embodiments, the battery structure may include: a battery body 100, the battery body 100 including a first side 110 and a second side 120 facing each other, and a third side 130 and a fourth side 140 facing each other, the first side 110, the third side 130, the second side 120 and the fourth side 140 being connected in sequence, and the area of ​​the first side 110 being larger than the area of ​​the third side 130.

[0035] The battery structure may further include: a first insulating film 101, the first insulating film 101 covering at least the first side 110.

[0036] The battery structure may also include a second insulating film 102, which at least covers the second side 120.

[0037] In this embodiment of the present disclosure, the first insulating film 101 and the second insulating film 102 are used to cover the first side 110 and the second side 120 respectively, so as to reduce the area of ​​the battery body 100 covered by a single insulating film, thereby improving the tightness of the adhesion between the first insulating film 101 and the second insulating film 102 and the battery body 100. At the same time, by using the first insulating film 101 and the second insulating film 102 to cover the first side 110 and the second side 120 respectively, the battery body 100 does not need to be flipped when covering the surface of the battery body 100 with the insulating film, thereby reducing the assembly difficulty of the battery structure.

[0038] In some embodiments, the thickness of the battery body 100 in the direction from the first side 110 to the second side 120 is 25mm to 40mm, for example, 25mm, 28mm, 30mm, 35mm, 38mm or 40mm, etc.

[0039] In the direction from the third side 130 to the fourth side 140, the width of the battery body 100 is 200mm to 319mm, for example, 200mm, 215mm, 230mm, 250mm, 280mm, 300mm or 319mm, etc.

[0040] In some embodiments, the battery body 100 may further include a top surface 150 and a bottom surface 160 facing each other, with terminals provided on the top surface 150 and the bottom surface 160. In the direction from the top surface 150 to the bottom surface 160, the length of the battery body 100 is 500mm to 1350mm, for example, 500mm, 650mm, 700mm, 850mm, 1000mm, 1200mm or 1350mm, etc.

[0041] In some embodiments, the length-to-thickness ratio of the battery body 100 is 12.5 to 40, for example, 12.5, 14, 18, 20, 30 or 40, etc.

[0042] The length-to-width ratio of the battery body 100 can be 1.57 to 6.75, for example, 1.57, 2, 3, 4, 5, 6 or 6.75, etc.

[0043] The ratio of the width to the thickness of the battery body 100 can be 5 to 13, for example, 5, 6, 7, 8, 9, 10, 11, 12 or 13, etc.

[0044] The first insulating film 101 and the second insulating film 102 serve as insulation protection, preventing the battery body from directly contacting external components, thereby avoiding the risk of short circuit. The insulation resistance of the first insulating film 101 and the second insulating film 102 is as high as 1000MΩ or more, and the withstand voltage rating is generally over 1000V, providing strong protection for the safety performance of the battery.

[0045] The first insulating film 101 and the second insulating film 102 also play a certain role in the thermal management of the battery body. The first insulating film 101 and the second insulating film 102 have good absorption and reflection characteristics of thermal radiation, which helps to achieve a uniform distribution of surface temperature of the battery body and thus reduces the possibility of local overheating.

[0046] The first insulating film 101 and the second insulating film 102 can be blue films. The materials used for the blue films, such as polyimide or PET (polyethylene terephthalate) with a ceramic coating, have extremely high insulation properties. At the same time, ceramic or graphite thermally conductive particles can be added to the blue films to increase the thermal conductivity of the first insulating film 101 and the second insulating film 102, improve heat dissipation efficiency, and the blue films have high ultraviolet reflectivity, reducing temperature rise in outdoor scenarios.

[0047] When selecting blue film, production process and cost factors can be fully considered. As a mature material, blue film has a stable production process, reliable quality, and relatively low cost. In addition, blue film has high contrast in vision inspection systems, which facilitates machine vision positioning and inspection of the integrity of the coating, thereby improving production efficiency.

[0048] In some embodiments, the first insulating film 101 further extends to a portion of the surface of the third side 130 and a portion of the surface of the fourth side 140. In other words, the first insulating film 101 also covers a portion of the third side 130 and a portion of the fourth side 140, thereby protecting and insulating the third side 130 and the fourth side 140 using the first insulating film 101.

[0049] In some embodiments, the second insulating film 102 further extends to a portion of the surface of the third side 130 and a portion of the surface of the fourth side 140. In other words, the second insulating film 102 also covers a portion of the third side 130 and a portion of the fourth side 140, thereby protecting and insulating the third side 130 and the fourth side 140 using the second insulating film 102.

[0050] In some embodiments, the first insulating film 101 and the second insulating film 102 located on the third side 130 partially overlap. That is, the first insulating film 101 also covers part of the surface of the second insulating film 102, or the second insulating film 102 also covers the surface of the first insulating film 101. By setting the first insulating film 101 and the second insulating film 102 located on the third side 130 to partially overlap, it can be ensured that the first insulating film 101 and the second insulating film 102 completely cover the third side 130, thereby improving the protective and insulating capabilities of the first insulating film 101 and the second insulating film 102 for the third side 130.

[0051] In some embodiments, the first insulating film 101 and the second insulating film 102 located on the fourth side 140 partially overlap. That is, the first insulating film 101 also covers part of the surface of the second insulating film 102, or the second insulating film 102 also covers the surface of the first insulating film 101. By setting the first insulating film 101 and the second insulating film 102 located on the fourth side 140 to partially overlap, it can be ensured that the first insulating film 101 and the second insulating film 102 completely cover the fourth side 140, thereby improving the protective and insulating capabilities of the first insulating film 101 and the second insulating film 102 for the fourth side 140.

[0052] In some embodiments, the edge of the first insulating film 101 located on the third side 130 is directly opposite and adjacent to the edge of the second insulating film 102. In other words, both the first insulating film 101 and the second insulating film 102 cover the third side 130, and the edges of the first insulating film 101 and the second insulating film 102 are in contact but do not overlap, thus completely covering the entire third side 130. By using the fact that the edges of the first insulating film 101 and the second insulating film 102 located on the third side 130 are directly opposite and adjacent to each other, the entire third side 130 can be completely covered while avoiding overlap between the first insulating film 101 and the second insulating film 102, thereby avoiding increasing the width of the battery structure.

[0053] It is understandable that if the first insulating film 101 and the second insulating film 102 partially overlap, the battery structure will be wider at the position corresponding to the overlapping part compared to the non-overlapping position. Setting the edge of the first insulating film 101 located on the third side 130 to be directly opposite and adjacent to the edge of the second insulating film 102 can also avoid affecting the installation of the battery structure.

[0054] In some embodiments, the edge of the first insulating film 101 located on the fourth side 140 is directly opposite and adjacent to the edge of the second insulating film 102. In other words, both the first insulating film 101 and the second insulating film 102 cover the fourth side 140, and the edges of the first insulating film 101 and the second insulating film 102 are in contact but do not overlap, thus completely covering the entire fourth side 140. By using the fact that the edges of the first insulating film 101 and the second insulating film 102 located on the fourth side 140 are directly opposite and adjacent, the overlap between the first insulating film 101 and the second insulating film 102 can be avoided while completely covering the entire fourth side 140, thereby avoiding increasing the width of the battery structure.

[0055] In some embodiments, the width of the second insulating film 102 extending to the surface of the third side 130 in the direction from the third side 130 to the fourth side 140 is 12.5 mm to 25 mm, for example, 12.5 mm, 13 mm, 14 mm, 15 mm, 20 mm, or 25 mm. It is understood that the wider the width of the second insulating film 102 extending to the surface of the third side 130, the stronger its ability to cover the third side 130, and the stronger its protective and insulating capabilities. However, if the second insulating film 102 extending to the surface of the third side 130 is too wide, it may cause overlap between the first insulating film 101 and the second insulating film 102, increasing the size of the battery structure and affecting its installation. Furthermore, an excessively wide second insulating film 102 may also cover the first side 110, further increasing the size of the battery structure.

[0056] In some embodiments, the width of the first insulating film 101 extending to the surface of the third side 130 in the direction from the third side 130 to the fourth side 140 is 12.5 mm to 25 mm, for example, 12.5 mm, 13 mm, 14 mm, 15 mm, 20 mm, or 25 mm. It is understood that the wider the width of the first insulating film 101 extending to the surface of the third side 130, the stronger its ability to cover the third side 130, and the stronger its protective and insulating capabilities. However, if the first insulating film 101 extending to the surface of the third side 130 is too wide, it may cause overlap between the first insulating film 101 and the second insulating film 102, increasing the size of the battery structure and affecting its installation. Furthermore, an excessively wide first insulating film 101 may also cover the second side 120, further increasing the size of the battery structure.

[0057] In some embodiments, the width of the first insulating film 101 extending to the surface of the third side 130 and the width of the second insulating film 102 extending to the surface of the third side 130 may be different, and the widths of the first insulating film 101 extending to the surface of the third side 130 and the widths of the second insulating film 102 extending to the surface of the third side 130 may be adjusted according to actual conditions.

[0058] In some embodiments, the width of the second insulating film 102 extending to the surface of the fourth side 140 in the direction from the third side 130 to the fourth side 140 can be 12.5 mm to 25 mm, for example, 12.5 mm, 13 mm, 14 mm, 15 mm, 20 mm or 25 mm.

[0059] In some embodiments, the width of the first insulating film 101 extending to the surface of the fourth side 140 in the direction from the third side 130 to the fourth side 140 can be 12.5 mm to 25 mm, for example, 12.5 mm, 13 mm, 14 mm, 15 mm, 20 mm or 25 mm.

[0060] In some embodiments, the width of the first insulating film 101 extending to the surface of the fourth side 140 may be different from the width of the first insulating film 101 extending to the surface of the third side 130, thereby reducing the difficulty of assembling the battery structure.

[0061] In some embodiments, the width of the second insulating film 102 extending to the surface of the fourth side 140 may be different from the width of the second insulating film 102 extending to the surface of the third side 130, thereby reducing the difficulty of assembling the battery structure.

[0062] In some embodiments, the battery structure may further include a third insulating film (not shown) covering a third side 130. That is, the first insulating film 101 may cover only the first side 110, or the first insulating film 101 may cover the first side 110 and at least a portion of the fourth side 140, and the second insulating film 102 may cover only the second side 120, or the second insulating film 102 may cover the second side 120 and at least a portion of the fourth side 140, thereby reducing the coverage area of ​​the first insulating film 101 and the second insulating film 102, thus facilitating the adaptation of first insulating films 101 and second insulating films 102 of different sizes.

[0063] In some embodiments, the battery structure may further include a fourth insulating film (not shown) covering a fourth side 140. That is, the first insulating film 101 may cover only the first side 110, or the first insulating film 101 may cover the first side 110 and at least a portion of the third side 130, and the second insulating film 102 may cover only the second side 120, or the second insulating film 102 may cover the second side 120 and at least a portion of the third side 130, thereby reducing the coverage area of ​​the first insulating film 101 and the second insulating film 102, thus facilitating the adaptation of first insulating films 101 and second insulating films 102 of different sizes.

[0064] In some embodiments, the difference between the length of the first insulating film 101 and the length of the first side surface 110 is 6mm to 20mm. It is understood that by setting the length of the first insulating film 101 to be longer, it can also cover the top surface 150 and the bottom surface 160 of the battery body 100, thereby controlling the first insulating film 101 to cover the entire first side surface 110, thereby improving the protective and insulating properties of the first insulating film 101 on the first side surface.

[0065] It is understandable that the first insulating film 101 covers the top surface 150 and the bottom surface 160 of the battery body 100. Therefore, the length of the top surface 150 and the bottom surface 160 of the battery body 100 on one side can be 1mm to 15mm, etc.

[0066] In some embodiments, the difference between the length of the second insulating film 102 and the length of the second side surface 120 is 6mm to 20mm. It is understood that by providing a longer length for the second insulating film 102, it can also cover the top surface 150 and bottom surface 160 of the battery body 100, thereby controlling the second insulating film 102 to cover the entire second side surface 120, thus improving the protective and insulating properties of the second insulating film 102 for the second side surface 120.

[0067] It is understandable that the second insulating film 102 covers the top surface 150 and bottom surface 160 of the battery body 100. Therefore, the length of the top surface 150 and bottom surface 160 of the battery body 100 covered on one side can be 1mm to 15mm, etc.

[0068] In some embodiments, the first insulating film 101 and the second insulating film 102 can be wound onto a spool along the length direction. Then, the battery body 100 is placed vertically along the length direction. The first insulating film 101 and the second insulating film 102 are placed on both sides of the first side 110 and the second side 120, respectively. The first insulating film 101 is overlapped and bonded to the first side 110, and the second insulating film 102 is overlapped and bonded to the second side 120. Then, the first insulating film 101 is bonded to the third side 130 and the fourth side 140, and the second insulating film 102 is bonded to the third side 130 and the fourth side 140.

[0069] In some embodiments, the length of the first insulating film 101 is also greater than the length of the first side 110. Therefore, after the first insulating film 101 is attached to the third side 130 and the fourth side 140, the first insulating film 101 is also attached to the top surface 150 and the bottom surface 160. The length of the second insulating film 102 is also greater than the length of the second side 120. Therefore, after the second insulating film 102 is attached to the third side 130 and the fourth side 140, the second insulating film 102 is also attached to the top surface 150 and the bottom surface 160, thereby increasing the surface area of ​​the first insulating film 101 and the second insulating film 102 covering the surface of the battery body 100.

[0070] In this embodiment of the present disclosure, the first insulating film 101 and the second insulating film 102 are used to cover the first side 110 and the second side 120 respectively, so as to reduce the area of ​​the battery body 100 covered by a single insulating film, thereby improving the tightness of the adhesion between the first insulating film 101 and the second insulating film 102 and the battery body 100. At the same time, by using the first insulating film 101 and the second insulating film 102 to cover the first side 110 and the second side 120 respectively, the battery body 100 does not need to be flipped when covering the surface of the battery body 100 with the insulating film, thereby reducing the assembly difficulty of the battery structure.

[0071] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the embodiments of this disclosure. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of this disclosure; therefore, the scope of protection of the embodiments of this disclosure should be determined by the scope defined in the claims.

Claims

1. A battery structure, characterized in that, include: The battery body includes a first side and a second side facing each other, and a third side and a fourth side facing each other. The first side, the third side, the second side and the fourth side are connected in sequence, and the area of ​​the first side is larger than the area of ​​the third side. A first insulating film, the first insulating film at least covering the first side; A second insulating film, wherein the second insulating film at least covers the second side.

2. The battery structure according to claim 1, characterized in that, The first insulating film also extends to a portion of the surface of the third side and a portion of the surface of the fourth side.

3. The battery structure according to claim 2, characterized in that, The second insulating film also extends to a portion of the surface of the third side and a portion of the surface of the fourth side.

4. The battery structure according to claim 3, characterized in that, The first insulating film located on the third side partially overlaps with the second insulating film; and / or, the first insulating film located on the fourth side partially overlaps with the second insulating film.

5. The battery structure according to claim 3, characterized in that, The edge of the first insulating film located on the third side is directly opposite and adjacent to the edge of the second insulating film; and / or, the edge of the first insulating film located on the fourth side is directly opposite and adjacent to the edge of the second insulating film.

6. The battery structure according to claim 3, characterized in that, The width of the second insulating film extending to the surface of the third side along the direction from the third side to the fourth side is 12.5 mm to 25 mm.

7. The battery structure according to claim 2, characterized in that, The width of the first insulating film extending to the surface of the third side along the direction from the third side to the fourth side is 12.5 mm to 25 mm.

8. The battery structure according to claim 1, characterized in that, Also includes: A third insulating film covers the third side surface.

9. The battery structure according to claim 1, characterized in that, Also includes: A fourth insulating film, the fourth insulating film covering the fourth side surface.

10. The battery structure according to claim 1, characterized in that, The battery body also includes a top surface and a bottom surface facing each other, and the top surface and the bottom surface are provided with electrode posts. The difference between the length of the first insulating film and the length of the first side surface is 6mm to 20mm, and / or the difference between the length of the second insulating film and the length of the second side surface is 6mm to 20mm.

Images