Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery. The battery comprises a battery shell, a winding type battery cell and an insulating film, the battery shell comprises a shell metal layer and a shell insulating layer which are laminated, and the shell metal layer and the shell insulating layer are of an integrally formed structure; the winding type battery cell is arranged in the battery shell, the winding type battery cell comprises a battery cell main body, and the battery cell main body is provided with a winding tail end part; the insulating film is at least adhered to the winding tail end part and a part of the outer side surface of the battery cell main body so as to fix the winding tail end part, and the thickness of the insulating film is greater than or equal to 0.02 mm and less than or equal to 0.09 mm. The battery not only ensures that the winding type battery cell is easy to install and enter the battery shell without causing the defects of material falling, short circuit and the like of the first pole piece and the second pole piece, but also is beneficial to improving the space utilization rate and the energy density; and moreover, the insulating layer is prevented from being damaged by friction force when entering the shell, safety risks such as short circuit and the like cannot be caused, and the phenomenon that the winding type battery core is loosened or scattered due to insufficient binding force is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery. Background Art

[0002] At present, the battery shell may include a stacked shell metal layer and a shell insulating layer, and the shell metal layer and the shell insulating layer are an integrally formed structure, which increases the battery shell's resistance to electrochemical corrosion; however, it causes the battery shell's strength to be reduced and is prone to deformation; and the battery cell is difficult to load into the battery shell.

[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 purpose of the present disclosure is to overcome the deficiencies of the above-mentioned related technologies and provide a battery.

[0005] According to one aspect of the present disclosure, there is provided a battery, comprising:

[0006] The battery shell comprises a stacked shell metal layer and a shell insulating layer, wherein the shell metal layer and the shell insulating layer are an integrally formed structure;

[0007] The wound battery cell is arranged in the battery housing, and the wound battery cell comprises a battery cell body, and the battery cell body has a winding tail end portion;

[0008] The insulating film is at least bonded to the winding tail end and a portion of the outer side surface of the battery body to fix the winding tail end, and the thickness of the insulating film is greater than or equal to 0.02 mm and less than or equal to 0.09 mm.

[0009] The battery disclosed in the present invention, on the one hand, fixes the winding tail end of the battery body by an insulating film, minimizes the area and volume of the insulating film, thereby reducing the volume of the wound battery, making it easier to install the wound battery into the battery shell. On the other hand, the thickness of the insulating film is greater than or equal to 0.02mm and less than or equal to 0.09mm, which not only ensures that the wound battery is easy to install into the battery shell, but also does not cause the first pole piece, the isolation film and the second pole piece to wrinkle and cause the first pole piece and the second pole piece to fall off, short circuit and other defects, and is conducive to improving space utilization and energy density; and ensures that the insulating layer will not be damaged by friction when entering the shell, will not cause safety risks such as short circuit, and will not cause insufficient binding force on the wound battery cell to loosen or unwind.

[0010] 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

[0011] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of an exemplary embodiment of the battery disclosed in the present invention.

[0013] Figure 2 A cross-sectional schematic diagram of an exemplary embodiment of a battery disclosed herein.

[0014] Figure 3 for Figure 2 Schematic diagram of the structure of the battery cell body and the insulating film.

[0015] Figure 4 FIG. 4 is a cross-sectional schematic diagram of another exemplary embodiment of a battery disclosed herein.

[0016] Figure 5 It is a structural schematic diagram of the battery cell body in a flattened state.

[0017] Description of reference numerals:

[0018] 1. Battery shell; 11. Shell metal layer; 12. Shell insulation layer; 13. Bottom wall plate; 14. Side plate;

[0019] 2. Wound cell; 21. Cell body; 211. Winding tail end; 212. First pole piece; 213. Isolation film; 214. Second pole piece; 22. First pole ear; 23. Second pole ear; 24. Large surface; 25. Edge; 26. Corner;

[0020] 3. Insulating film; 4. Cover plate; 5. First pole; 6. Second pole. DETAILED DESCRIPTION

[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0022] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0023] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0024] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0025] The present disclosure provides a battery according to an exemplary embodiment. Figure 1-Figure 5 As shown, the battery may include a battery case 1, a wound battery cell 2 and an insulating film 3; the battery case 1 may include a stacked shell metal layer 11 and a shell insulating layer 12, and the shell metal layer 11 and the shell insulating layer 12 are an integrally formed structure; the wound battery cell 2 is arranged in the battery case 1, and the wound battery cell 2 includes a battery cell body 21, and the battery cell body 21 has a winding tail end portion 211; the insulating film 3 is at least bonded to the winding tail end portion 211 and a portion of the outer side surface of the battery cell body 21 to fix the winding tail end portion 211, and the thickness of the insulating film 3 is greater than or equal to 0.02 mm and less than or equal to 0.09 mm.

[0026] The battery disclosed in the present invention, on the one hand, fixes the winding tail end 211 of the battery body 21 by the insulating film 3, minimizes the area and volume of the insulating film 3, thereby reducing the volume of the wound battery 2, making it easier to install the wound battery 2 into the battery housing 1. On the other hand, the thickness of the insulating film 3 is greater than or equal to 0.02mm and less than or equal to 0.09mm, which not only ensures that the wound battery 2 is easily installed into the battery housing 1, but also does not cause the first pole piece 212, the isolation film 213 and the second pole piece 214 to wrinkle and cause the first pole piece 212 and the second pole piece 214 to fall off, short circuit and other defects, and is conducive to improving space utilization and energy density; and ensures that the insulating layer will not be damaged by the friction when entering the shell, will not cause safety risks such as short circuit, and will not cause the winding or loose winding due to insufficient binding force on the wound battery 2.

[0027] In this example embodiment, the battery may be a quadrangular prism battery. Figure 1 As shown, the battery housing 1 of the quadrangular prism battery can be set to a rectangular parallelepiped structure. Specifically, the battery housing 1 may include five wall panels, and the five wall panels are respectively a bottom wall panel 13 and four side panels 14. The four side panels 14 are arranged opposite to each other in pairs; the four side panels 14 are connected end to end in sequence to form a rectangular cylindrical shape. The bottom wall panel 13 is connected to one side of the four side panels 14, so that the bottom wall panel 13 and the four side panels 14 are surrounded to form a accommodating cavity. The cover plate 4 is connected to the other side of the four side panels 14, and the opening of the battery housing 1 is sealed by the cover plate 4.

[0028] Of course, in some other example embodiments of the present disclosure, the bottom wall plate 13 and the cover plate 4 can be set to be circular, elliptical, other polygonal, etc., and the side plate 14 can be set to one or more, and surround to form a cylinder, an elliptical cylinder, other polygonal cylinder, etc., so that the battery housing 1 is formed into a cylindrical shape, an elliptical cylinder shape, other polygonal cylinder shape, etc., so that the battery is a cylindrical battery, an elliptical cylindrical battery, other polygonal prismatic battery, etc.

[0029] Reference Figure 2 and Figure 4 As shown, the battery housing 1 may include a housing metal layer 11 and a housing insulating layer 12 which are stacked, so that the bottom wall plate 13 and four side plates 14 of the battery housing 1 are both a stacked structure including two layers of a metal layer and an insulating layer.

[0030] The outer shell metal layer 11 and the outer shell insulating layer 12 are an integrally formed structure, that is, the outer shell metal layer 11 and the outer shell insulating layer 12 are formed by an integrally formed process. For example, an insulating layer can be formed on a metal plate by bonding, coating, hot melting and other processes, and then the metal plate formed with the insulating layer is subjected to a stamping process or a stretching process, so that the metal plate formed with the insulating layer forms a battery outer shell 1 with a accommodating cavity, that is, the metal plate forms the outer shell metal layer 11, and the insulating layer forms the outer shell insulating layer 12. The integrally formed structure is not to first form the outer shell metal layer 11 with a accommodating cavity by a stamping process or a stretching process on the metal plate, and then form the outer shell insulating layer 12 on the outer shell metal layer 11 by bonding, coating, hot melting and other processes. The integrally formed structure makes the connection between the outer shell metal layer 11 and the outer shell insulating layer 12 tighter, and there is almost no gap between the outer shell metal layer 11 and the outer shell insulating layer 12. Moreover, the preparation process is relatively simple, which is conducive to improving efficiency.

[0031] The outer shell metal layer 11 can be a steel shell, an aluminum shell or an aluminum alloy shell, that is, the material of the outer shell metal layer 11 can be steel (stainless steel (SUS304), cold-rolled carbon steel (SPCC / SPCE)), aluminum or aluminum alloy, etc., of course, it can also be other materials, which are not explained here one by one.

[0032] In order to ensure the space utilization of the battery shell 1 and the energy density of the battery, the wall thickness of the battery shell 1 including the shell metal layer 11 and the shell insulating layer 12 is substantially the same as the wall thickness of the battery shell 1 including only the metal layer. Since the strength of the shell insulating layer 12 is relatively low, the strength of the battery shell 1 including the shell metal layer 11 and the shell insulating layer 12 is reduced and is easily deformed; the wound battery cell 2 is difficult to be loaded into the battery shell 1.

[0033] In this example implementation, refer to Figure 2 and Figure 4 As shown, a wound battery cell 2 is arranged in the accommodating cavity of the battery housing 1. The wound battery cell 2 is arranged as a rectangular parallelepiped adapted to the battery housing 1. The wound battery cell 2 is the smallest unit for charging and discharging the battery.

[0034] Reference Figure 5 As shown, the wound cell 2 may include a cell body 21, a first pole ear 22, and a second pole ear 23. The cell body 21 may include a first pole piece 212, a separator 213, and a second pole piece 214 arranged in layers, that is, the wound cell 2 may include a first pole piece 212 and a second pole piece 214 arranged in layers, and a separator 213 arranged between the first pole piece 212 and the second pole piece 214. The wound cell 2 is formed by winding the stacked structure formed by the first pole piece 212, the separator 213, and the second pole piece 214. Different active materials are coated on the first pole piece 212 and the second pole piece 214.

[0035] The polarity of the first electrode 212 is opposite to that of the second electrode 214. For example, the first electrode 212 can be a positive electrode and the second electrode 214 can be a negative electrode. Of course, the first electrode 212 can also be a negative electrode and the second electrode 214 can be a positive electrode.

[0036] Since the wound battery cell 2 is formed by winding, the battery cell body 21 has a winding tail end 211 , which may be the tail end of a stacked structure formed by the first pole piece 212 , the isolation film 213 and the second pole piece 214 located at the outermost side of the battery cell body 21 .

[0037] Reference Figure 5 As shown, in order to ensure the charging efficiency and service life of the battery, the area of ​​the negative electrode sheet (the second electrode sheet 214) is larger than the area of ​​the positive electrode sheet (the first electrode sheet 212); in order to ensure the insulation effect between the negative electrode sheet and the positive electrode sheet, the area of ​​the isolation film 213 is greater than or equal to the area of ​​the negative electrode sheet (the second electrode sheet 214). When the isolation film 213, the negative electrode sheet and the positive electrode sheet are in a flattened state, the positive projection of the negative electrode sheet (the second electrode sheet 214) on the isolation film 213 covers and is larger than the positive projection of the positive electrode sheet (the first electrode sheet 212) on the isolation film 213, and the isolation film 213 covers and is larger than the negative electrode sheet (the second electrode sheet 214) on the isolation film 213. In the case where the isolation film 213 exceeds the size of the second electrode sheet 214 by a large amount, the winding tail end portion 211 can also be the tail end portion of the isolation film 213 located at the outermost side of the battery body 21.

[0038] The winding tail end portion 211 needs to be fixed to ensure that the wound battery core 2 does not unwind.

[0039] Reference Figure 2 and Figure 3 As shown, Figure 2 In the figure, since the edge of the winding tail end 211 is blocked by the insulating film 3, it is indicated by a dotted line, and the insulating film 3 is at least bonded to the winding tail end 211 and a portion of the outer side surface of the battery body 21 to fix the winding tail end 211. Specifically, the insulating film 3 can be bonded to the winding tail end 211 and a portion of the outer side surface of the battery body 21 adjacent to the winding tail end 211, that is, the winding tail end 211 is bonded and fixed to the outer side surface of the battery body 21 by the insulating film 3 to prevent the wound battery 2 from unwinding. The winding tail end 211 of the battery body 21 is fixed by the insulating film 3, and the area and volume of the insulating film 3 are minimized, thereby reducing the volume of the wound battery 2, so that the wound battery 2 is easier to be loaded into the battery housing 1.

[0040] In this example embodiment, the thickness H1 of the insulating film 3 is greater than or equal to 0.02 mm and less than or equal to 0.09 mm. For example, the thickness H1 of the insulating film 3 can be 0.025 mm, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm, 0.05 mm, 0.055 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.075 mm, 0.08 mm, 0.085 mm, etc.

[0041] If the thickness H1 of the insulating film 3 is too large, the size of the wound battery cell 2 will be too large, and the wound battery cell 2 will be difficult to install into the battery casing 1. Even if it is barely installed into the battery casing 1, the friction force when entering the casing will cause the first pole piece 212, the isolation film 213 and the second pole piece 214 to wrinkle, causing the first pole piece 212 and the second pole piece 214 to fall off, short circuit and other defects; moreover, the wound battery cell 2 will occupy a large space in the battery casing 1, which is not conducive to improving space utilization and energy density.

[0042] If the thickness H1 of the insulating film 3 is too small, resulting in low strength of the insulating film 3, when the wound battery cell 2 is installed into the battery casing 1, the insulating film 3 will be damaged due to friction, which will not only cause safety risks such as short circuits, but also cause the winding of the wound battery cell 2 to be loose or unwound due to insufficient binding force.

[0043] The above numerical range not only ensures that the wound battery cell 2 is easy to install into the battery casing 1, and will not cause the first pole piece 212, the isolation film 213 and the second pole piece 214 to wrinkle and cause the first pole piece 212 and the second pole piece 214 to fall off, short circuit and other defects, but also is beneficial to improving space utilization and energy density; it also ensures that the insulating film 3 will not be damaged by the friction force when entering the shell, will not cause safety risks such as short circuit, and will not cause insufficient binding force on the wound battery cell 2 to loosen or unwind.

[0044] It should be noted that the material falling off of the first pole piece 212 and the second pole piece 214 refers to the falling off of active materials on the first pole piece 212 and the second pole piece 214 .

[0045] In this example embodiment, since the wound battery cell 2 is configured as a rectangular parallelepiped that is compatible with the battery casing 1, the wound battery cell 2 has a large surface 24. The large surface 24 of the wound battery cell 2 refers to an outer surface of the wound battery cell 2 with the largest area. The large surface 24 is basically a plane, and the winding tail end portion 211 is located on the large surface 24, so that the winding tail end portion 211 is also basically a plane. The unfolding force of the winding tail end portion 211 is small, so that the thickness and area of ​​the insulating film 3 that fixes the winding tail end portion 211 can be set smaller to meet the requirements, thereby making it easy for the wound battery cell 2 to be installed into the battery casing 1, which is beneficial to improving space utilization and energy density.

[0046] Moreover, the winding tail end portion 211 is generally provided as one, and the winding tail end portion 211 is located on the large surface 24 , so that at least one large surface 24 is bonded with the insulating film 3 .

[0047] In this example embodiment, the ratio of the area of ​​the insulating film 3 bonded to a large surface 24 to the area of ​​the large surface 24 is greater than or equal to 0.3 and less than or equal to 1.2. For example, the ratio of the area of ​​the insulating film 3 to the area of ​​the large surface 24 can be 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, 0.93, 0.95, 0.98, 1, 1.02, 1.05, 1.07, 1.1, 1.13, 1.15, 1.18, etc.

[0048] Generally, the area of ​​the large surface 24 of the battery is already fixed. If the ratio of the area of ​​the insulating film 3 to the area of ​​the large surface 24 is too small, the area of ​​the insulating film 3 is too small, resulting in a small bonding and fixing area between the winding tail end 211 and the outer side surface of the battery body 21, and the insulating film 3 has insufficient binding force on the wound battery 2, resulting in loose or scattered winding.

[0049] If the ratio of the area of ​​the insulating film 3 to the area of ​​the large surface 24 is too large, the area of ​​the insulating film 3 is too large, and the insulating film 3 slows down the heat transfer rate between the wound battery cell 2 and the battery casing 1, and the gas transmission rate is correspondingly reduced, resulting in the risk of thermal runaway inside the battery.

[0050] The above numerical range not only ensures that the bonding and fixing area between the winding tail end portion 211 and the outer side surface of the battery body 21 is sufficient, and the winding will not be loose or unwound due to insufficient binding force of the insulating film 3 on the wound battery 2; it also ensures the heat transfer rate between the wound battery 2 and the battery casing 1, and does not cause the risk of thermal runaway inside the battery.

[0051] It should be noted that the area of ​​the insulating film 3 refers to the area after the insulating film 3 is unfolded to form a substantially flat surface.

[0052] The insulating film 3 is bonded to the tail end of the isolation film 213, thereby fixing the wound battery cell 2. The isolation film 213 of the wound battery cell 2 is also wound, and the wound isolation film 213 has a certain unfolding force. If the thickness of the insulating film 3 is less than the thickness of the isolation film 213, the strength of the insulating film 3 is relatively small. Under the action of the unfolding force of the isolation film 213, it is easy to drive the insulating film 3 to detach from the side wall of the wound battery cell 2, thereby resulting in insufficient binding force on the wound battery cell 2 and loose winding or unwinding.

[0053] In this example implementation, refer to Figure 3 As shown, the thickness H1 of the insulating film 3 is greater than the thickness H2 of the isolation film 213, so that the strength of the insulating film 3 is relatively large. Even under the action of the unfolding force of the isolation film 213, the insulating film 3 and the side wall of the wound battery cell 2 will not be detached, ensuring that the binding force on the wound battery cell 2 is sufficient and will not loosen or unwind.

[0054] Reference Figure 2 and Figure 4 As shown, the first pole tab 22 and the second pole tab 23 of the wound battery cell 2 can be led out from the same side of the battery cell body 21 . For example, the first pole tab 22 and the second pole tab 23 can be led out from a first end surface of the battery cell body 21 .

[0055] Specifically, the first pole ear 22 is connected to the first pole piece 212, and the first pole ear 22 is located on the side of the first end face away from the battery cell body 21; a portion of the first pole piece 212 may extend out of the battery cell body 21 and bend to the side of the first end face away from the battery cell body 21 to form the first pole ear 22.

[0056] The second pole ear 23 is connected to the second pole piece 214 and is located on the side of the first end surface away from the battery cell body 21 . A portion of the second pole piece 214 may extend out of the battery cell body 21 and bend to the side of the first end surface away from the battery cell body 21 to form the second pole ear 23 .

[0057] It should be noted that the first pole tab 22 and the second pole tab 23 are conductive foil areas without active material coating, that is, no active material coating is coated on the first pole tab 22 and the second pole tab 23, and they are current collecting layers for transmitting current.

[0058] The first pole tab 22 can be connected to the first pole 5 so that the first pole 5 can form the positive pole of the battery; the second pole tab 23 can be connected to the second pole 6 so that the second pole 6 can form the negative pole of the battery.

[0059] In this exemplary embodiment, the insulating film 3 is arranged opposite to the battery casing 1, or it can be said that the insulating film 3 is arranged between the battery casing 1 and the battery cell body 21. In this case, the thickness H1 of the insulating film 3 is less than or equal to 0.085 mm. Further reducing the thickness H1 of the insulating film 3 improves the efficiency of heat transfer between the battery cell body 21 and the battery casing 1. The wound battery cell 2 will generate more heat during the charging and discharging process. The thin insulating film 3 can quickly transfer the heat to the battery casing 1 to prevent the wound battery cell 2 from overheating.

[0060] In this example embodiment, the thermal conductivity of the insulating film 3 is greater than or equal to 0.25w / m·k. For example, the thermal conductivity of the insulating film 3 may be 0.27w / m·k, 0.3w / m·k, 0.33w / m·k, 0.35w / m·k, 0.38w / m·k, 0.4w / m·k, 0.42w / m·k, 0.45w / m·k, 0.47w / m·k, 0.5w / m·k, 0.53w / m·k, 0.55w / m·k, 0.58w / m·k, 0.6w / m·k, etc. Setting the thermal conductivity of the insulating film 3 to be relatively large can improve the heat transfer efficiency between the wound battery cell 2 and the battery housing 1, and timely transfer the heat generated by the wound battery cell 2 to avoid overheating of the wound battery cell 2.

[0061] In this example implementation, refer to Figure 2 As shown, the outer shell insulating layer 12 can be arranged on the inner surface of the outer shell metal layer 11, that is, the outer shell insulating layer 12 is arranged closer to the wound battery core 2 relative to the outer shell metal layer 11. The outer shell insulating layer 12 can increase the ability of the battery shell 1 to resist electrolyte corrosion, and increase the insulation effect between the battery shell 1 and the wound battery core 2.

[0062] In this case, the wall thickness H3 of the outer shell insulating layer 12 is less than or equal to 0.12 mm. For example, the wall thickness H3 of the outer shell insulating layer 12 may be 0.05 mm, 0.08 mm, 0.1 mm, etc. The wall thickness H3 of the outer shell insulating layer 12 is set to be thinner, which increases the heat transfer efficiency between the wound battery core 2 and the battery shell 1, and avoids overheating of the wound battery core 2; and can improve the space utilization of the battery shell 1, thereby improving the energy density of the battery.

[0063] The material of the outer shell insulating layer 12 may be an inorganic non-metallic material, for example, the material of the outer shell insulating layer 12 may be Al2O3, SiC, SiO2, etc.

[0064] The material of the outer shell insulating layer 12 can be a polymer or a resin. For example, the material of the outer shell insulating layer 12 can be polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), LCP plastic material (LIQUID CRYSTAL POLYMER, also known as liquid crystal polymer), soluble polytetrafluoroethylene (PFA), acrylonitrile-butadiene-styrene copolymer (ABS), polyphenylene sulfide (PPS), etc.

[0065] Of course, in some other exemplary embodiments of the present disclosure, reference Figure 4As shown in the figure, the edges 25 and corners 26 of the wound battery cell 2 are covered by the insulating film 3 and are therefore indicated by dotted lines, and the outer shell insulating layer 12 can be arranged on the outer surface of the outer shell metal layer 11, that is, the outer shell insulating layer 12 is arranged farther away from the wound battery cell 2 relative to the outer shell metal layer 11. The outer shell insulating layer 12 can increase the insulation effect between the battery shell 1 and other external components.

[0066] The material of the outer shell insulating layer 12 may be an inorganic non-metallic material, for example, the material of the outer shell insulating layer 12 may be Al2O3, SiC, SiO2, etc.

[0067] The material of the outer shell insulating layer 12 can be a polymer or a resin. For example, the material of the outer shell insulating layer 12 can be polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), LCP plastic material (LIQUID CRYSTAL POLYMER, also known as liquid crystal polymer), soluble polytetrafluoroethylene (PFA), acrylonitrile-butadiene-styrene copolymer (ABS), polyphenylene sulfide (PPS), etc.

[0068] In this case, the outer shell metal layer 11 is arranged on the inner surface of the outer shell insulating layer 12. When the wound battery cell 2 is installed into the battery outer shell 1, the wound battery cell 2 is in direct contact with the outer shell metal layer 11, which will produce a certain amount of friction, especially the edges 25 and corners 26 of the wound battery cell 2, which are most likely to produce friction with the outer shell metal layer 11. The outer shell metal layer 11 is made of metal, which has greater strength and lower compressibility, resulting in the edges 25 and corners 26 of the wound battery cell 2 being easily rubbed, causing the first electrode and the second electrode to fall off or short-circuit.

[0069] The insulating film 3 is bonded to at least a portion of the edge 25 and at least a portion of the corner 26 of the wound battery cell 2. For example, the insulating film 3 can be bonded to all the edges 25 of the wound battery cell 2, or to a portion of the edge 25 of the wound battery cell 2 that is easily rubbed; the insulating film 3 can be bonded to all the corners 26 of the wound battery cell 2, or to a portion of the corner 26 of the wound battery cell 2 that is easily rubbed. The edges 25 and corners 26 of the wound battery cell 2 are protected by the insulating film 3 to prevent the outer shell metal layer 11 from rubbing the edges 25 and corners 26 of the wound battery cell 2, thereby preventing the first electrode and the second electrode from dropping or short-circuiting.

[0070] In this exemplary embodiment, the thermal conductivity of the outer shell metal layer 11 is greater than or equal to 30w / m·k. For example, the thermal conductivity of the outer shell metal layer 11 may be 32w / m·k, 35w / m·k, 37w / m·k, 40w / m·k, 43w / m·k, 45w / m·k, 48w / m·k, 50w / m·k, etc. That is, the thermal conductivity of the outer shell metal layer 11 is relatively large, which can improve the heat transfer efficiency between the wound battery cell 2 and the battery shell 1, and transfer the heat generated by the wound battery cell 2 in time to avoid overheating of the wound battery cell 2.

[0071] The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel or perpendicular, but also can have a certain error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, the two are considered to be parallel to each other; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, the two are considered to be perpendicular to each other.

[0072] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which 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 examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A battery, characterized in that: include: A battery shell, comprising a stacked shell metal layer and a shell insulating layer, wherein the shell metal layer and the shell insulating layer are an integrally formed structure; A wound battery cell is disposed in the battery housing, wherein the wound battery cell comprises a battery cell body having a winding tail end portion; An insulating film is at least bonded to the winding tail end and a portion of the outer side surface of the battery body to fix the winding tail end, and the thickness of the insulating film is greater than or equal to 0.02 mm and less than or equal to 0.09 mm.

2. The battery according to claim 1, characterized in that The wound battery core has a large surface, and the winding tail end is located on the large surface.

3. The battery according to claim 2, characterized in that A ratio of an area of ​​the insulating film bonded to one of the large surfaces to an area of ​​the large surface is greater than or equal to 0.3 and less than or equal to 1.

2.

4. The battery according to claim 1, characterized in that The thermal conductivity of the insulating film is greater than or equal to 0.25w / m·k.

5. The battery according to claim 1, characterized in that The insulating film is arranged opposite to the battery housing, and the thickness of the insulating film is less than or equal to 0.085 mm.

6. The battery according to claim 1, characterized in that The wound battery cell includes a first pole piece, a second pole piece and an isolation film, wherein the isolation film is arranged between the first pole piece and the second pole piece, and the thickness of the insulation film is greater than the thickness of the isolation film.

7. The battery according to any one of claims 1 to 6, characterized in that: The outer shell insulating layer is arranged on the inner surface of the outer shell metal layer, and the wall thickness of the outer shell insulating layer is less than or equal to 0.12 mm.

8. The battery according to any one of claims 1 to 6, characterized in that: The shell insulating layer is arranged on the outer surface of the shell metal layer.

9. The battery according to any one of claims 1 to 6, characterized in that: The thermal conductivity of the outer shell metal layer is greater than or equal to 30w / m·k.

10. The battery according to any one of claims 1 to 6, characterized in that: The battery is a quadrangular prism battery.

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