Battery cell assembly and battery

Abstract

The application provides an electric cell assembly and a battery. The electric cell assembly comprises an electric cell body, an insulation film, the insulation film comprises at least two connected first insulation surfaces and second insulation surfaces, the first insulation surfaces and the second insulation surfaces wrap different sides of the electric cell body, the first insulation surfaces extend along the length direction of the electric cell body, the second insulation surfaces extend along the width direction of the electric cell body, and the height of the second insulation surfaces is higher than the height of the first insulation surfaces along the height direction of the electric cell body. The application avoids the insulation film from falling off, and the welding quality of the insulation film and the insulation piece is good.

Description

Technical Field

[0001] This application relates to a battery cell assembly and a battery, belonging to the field of new energy battery technology. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy. It is widely used in daily life, and with the development of the battery industry, the requirements for battery performance are becoming increasingly stringent.

[0003] In conceiving and implementing this application, the applicant discovered at least the following problems: The battery includes a cell, a casing, an insulating component, an insulating film, and a cover plate. The insulating film wraps around the cell and is then placed inside the casing. The insulating film is welded to the insulating component for positioning, and finally, the cover plate is welded to the casing to complete the encapsulation. However, during the welding and positioning of the insulating film and the insulating component, the sides of the insulating film are prone to collapse, causing the insulating film to detach and resulting in poor welding performance.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] This application provides a cell assembly and battery that prevents the insulating film from falling off and ensures good welding quality between the insulating film and the insulating component.

[0006] This application provides a battery cell assembly, including:

[0007] Battery cell body;

[0008] The insulating film includes at least two connected first insulating surfaces and second insulating surfaces, which wrap different sides of the battery cell body.

[0009] The first insulating surface extends along the length of the cell body, and the second insulating surface extends along the width of the cell body. The height of the second insulating surface is higher than that of the first insulating surface along the height of the cell body.

[0010] In addition, this application also provides a battery, including a casing and the aforementioned cell assembly;

[0011] The housing has a receiving cavity, in which the battery cell assembly is housed.

[0012] The beneficial effects of this application are: by designing the height of the second insulating surface to be higher than that of the first insulating surface, it can be ensured that the contact area between the insulating film and the insulating component is increased during the welding process, which helps to improve the strength and stability of the welding and prevent the insulating film from falling off during use. Attached Figure Description

[0013] The above and other objects, features, and advantages of embodiments of this application will become more readily understood through the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application will be described by way of example and non-limitation, wherein:

[0014] Figure 1 This is a first-view structural diagram of the battery according to an embodiment of this application;

[0015] Figure 2 This is a first-view exploded view of a battery according to an embodiment of this application;

[0016] Figure 3 for Figure 2 A magnified view of a portion of point I in the middle;

[0017] Figure 4 This is a second-view exploded view of the battery according to an embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the structure of the battery cell assembly according to an embodiment of this application;

[0019] Figure 6 for Figure 5 A magnified view of a section at point II;

[0020] Figure 7 This is a cross-sectional view of the insulating film in the battery cell assembly according to an embodiment of this application;

[0021] Figure 8 This is a schematic diagram of the structure of the second insulating surface in the battery cell assembly according to an embodiment of this application.

[0022] Figure label:

[0023] 100-Battery Cell Assembly;

[0024] 110 - Battery cell body;

[0025] 120 - Insulating film;

[0026] 121 - First insulating surface;

[0027] 122 - Second insulating surface;

[0028] 1221 - First Floor;

[0029] 1222 - Second layer;

[0030] 123 - Flexible support component;

[0031] 124 - Insulation layer;

[0032] 200-battery;

[0033] 210 - Casing;

[0034] 220-Pole Column;

[0035] 230 - Insulating components;

[0036] 240 - Cover plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. All other obtained embodiments are within the scope of protection of this application. In the absence of conflict, the following embodiments and features can be combined with each other.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] In conceiving and implementing this application, the applicant discovered at least the following problems: The battery includes a cell, a casing, an insulating component, an insulating film, and a cover plate. The insulating film wraps around the cell and is then placed inside the casing. The insulating film is welded to the insulating component for positioning, and finally, the cover plate is welded to the casing to complete the encapsulation. However, during the welding and positioning of the insulating film and the insulating component, the sides of the insulating film are prone to collapse, causing the insulating film to detach and resulting in poor welding performance.

[0042] The battery cell assembly proposed in this application, by designing the height of the second insulating surface to be higher than that of the first insulating surface, can ensure that the contact area between the insulating film and the insulating component is increased during the welding process, which helps to improve the strength and stability of the welding and prevents the insulating film from falling off during use.

[0043] A battery cell is the smallest charging and discharging unit. A battery cell consists of a positive electrode, a negative electrode, and a separator between them, which are formed by winding or stacking to form the battery cell body. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metal materials such as aluminum foil, nickel foil, and stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, conductive agent, binder, etc. The main positive active material includes one or more of the following lithium-containing positive active materials: lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0044] Similarly, the negative electrode sheet includes a negative current collector and a negative active material. The negative current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite foil material formed by combining metals and insulating materials. The negative active material includes the negative active material, conductive agent, binder, etc. The negative active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0045] The tab serves as the current output terminal of the battery cell. The tab is either integrated with or separately connected to the positive or negative electrode.

[0046] The separator, as an insulating layer, prevents short circuits within the battery cell caused by contact between the positive and negative electrodes. It also acts as a semi-permeable layer, preventing larger molecules from passing through while allowing smaller charged ions to pass. The base of the tab is the edge of the active material coating area of ​​the electrode.

[0047] The battery cell assembly provided in this application will be described in detail below with reference to specific embodiments.

[0048] Figure 1 This is a first-view structural diagram of the battery according to an embodiment of this application. Figure 2 This is a first-view exploded view of the battery according to an embodiment of this application. Figure 3 for Figure 2 A magnified view of a portion of point I in the middle. Figure 4 This is a second-view exploded view of the battery according to an embodiment of this application. Figure 5 This is a schematic diagram of the structure of the battery cell assembly according to an embodiment of this application. Figure 6 for Figure 5 A magnified view of a portion of point II.

[0049] like Figures 1 to 6 As shown in the figure, this application provides a battery cell assembly 100, comprising:

[0050] Battery cell body 110;

[0051] Insulating film 120, the insulating film 120 includes at least two connected first insulating surfaces 121 and second insulating surfaces 122, the first insulating surfaces 121 and second insulating surfaces 122 wrap around different sides of the battery cell body 110.

[0052] The first insulating surface 121 extends along the length direction of the cell body 110, and the second insulating surface 122 extends along the width direction of the cell body 110. The height of the second insulating surface 122 is higher than the height of the first insulating surface 121 along the height direction of the cell body 110.

[0053] It should be noted that the cell body 110 is the core component of the battery 200, responsible for the storage and release of electrical energy.

[0054] In some embodiments, the cell body 110 includes a positive electrode, a separator, and a negative electrode. In this invention, the positive electrode includes a positive current collector and a positive active layer disposed on at least one functional surface of the positive current collector. The negative electrode includes a negative current collector and a negative active layer disposed on at least one functional surface of the negative current collector.

[0055] In this invention, the positive electrode, separator, and negative electrode can be stacked to form a stacked cell body 110, or the positive electrode, separator, and negative electrode can be stacked and then wound to form a wound cell body 110.

[0056] It should be noted that after the insulating film 120 wraps the cell body 110, it needs to be welded to the insulating component 230 of the battery 200 for positioning. During welding, especially for the wound structure cell body 110, the cell body 110 is curved near the second insulating surface 122, and the second insulating surface 122 is difficult to fit against this curved surface. The side of the cell body 110 provides poor support for the second insulating surface 122, which makes the second insulating surface 122 prone to collapse. Therefore, along the height direction of the cell body 110, the design of the second insulating surface 122 being higher than the height of the first insulating surface 121 allows the second insulating surface 122 to be better welded to the insulating component 230, ensuring welding strength, preventing the insulating film 120 from falling off, and ensuring the insulation effect.

[0057] It should be noted that the cell body 110 includes a first surface and a second surface, wherein the first surface extends along the length direction of the cell body 110 and the second surface extends along the width direction of the cell body 110.

[0058] In this design, the first insulating surface 121 wraps around the first surface, and the second insulating surface 122 wraps around the second surface. The first surface can be a large surface with a relatively flat surface, so the first insulating surface 121 has a high degree of fit when wrapping around the first surface. However, the second surface is generally curved, making it difficult for the second insulating surface 122 to fit snugly against it. The poor support from the second surface to the second insulating surface 122 causes the second insulating surface 122 to easily collapse. Therefore, by designing the height of the second insulating surface 122 to be higher than the height of the first insulating surface 121, the excess height is used to compensate for the collapse problem, allowing the second insulating surface 122 to be better welded to the insulating component 230.

[0059] Specifically, due to the higher height of the second insulating surface 122, it can be better welded to the insulating component 230. This design ensures the strength of the weld joint, reduces potential collapse problems during welding, and thus improves the overall structural reliability. By ensuring the stable positioning of the insulating film 120, the risk of electrical contact between different sides of the cell body 110 is reduced, improving the insulation performance of the cell assembly 100, reducing the possibility of short circuits, and enhancing the safety of the battery 200.

[0060] It should be noted that X represents the length direction of the battery cell body 110, Y represents the width direction of the battery cell body 110, and Z represents the height direction of the battery cell body 110.

[0061] By setting the height of the second insulating surface 122 higher than that of the first insulating surface 121, the contact area between the insulating film 120 and the insulating component 230 can be increased during the welding process, which helps to improve the strength and stability of the welding and prevents the insulating film 120 from falling off during use.

[0062] like Figures 2 to 6 As shown, in some optional embodiments, along the height direction of the cell body 110, the difference H between the height of the second insulating surface 122 and the height of the first insulating surface 121 is greater than or equal to 0.2 mm and less than or equal to 7 mm.

[0063] It should be noted that by designing a reasonable H value, the stability of the insulating film 120 on the cell body 110 can be ensured, reducing the risk of short circuits caused by film displacement or detachment, thereby improving the safety of the battery 200.

[0064] Specifically, if H is too large, the melting of the insulating film 120 will affect the welding quality between the cover plate 240 and the housing 210. If H is too small, the second insulating surface 122 may not be able to effectively contact the insulating component 230, resulting in the inability to perform effective welding. This will reduce the positioning stability of the insulating film 120, increase the risk of the cell assembly 100 falling off during use, and thus affect the insulation performance and safety of the battery 200.

[0065] like Figure 5 As shown, in some embodiments, along the height direction of the cell body 110, the height of the second insulating surface 122 is H1, wherein H1 is greater than or equal to 70 mm and less than or equal to 260 mm.

[0066] In some embodiments, H1 can be 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, or any value thereof.

[0067] In some embodiments, along the height direction of the cell body 110, the height of the first insulating surface 121 is H2, wherein H2 is greater than or equal to 65mm and less than or equal to 255mm.

[0068] In some embodiments, H2 can be 65mm, 75mm, 85mm, 95mm, 105mm, 115mm, 125mm, 135mm, 145mm, 155mm, 165mm, 175mm, 185mm, 195mm, 205mm, 215mm, 225mm, 235mm, 245mm, 255mm, or any value thereof.

[0069] It should be noted that H = H1 - H2.

[0070] In some embodiments, H can be 0.2mm, 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, or any value thereof.

[0071] Therefore, based on the above, setting a lower limit value can ensure that the second insulating surface 122 can effectively contact the insulating component 230. This is to ensure that the insulating film 120 can be firmly welded to the lower plastic or other insulating component 230, avoiding welding failure due to poor contact.

[0072] Setting an upper limit can prevent excessive height difference and avoid problems such as reduced welding quality between cover plate 240 and shell 210 due to excessive dimensional protrusion during welding. This helps maintain a good connection between cover plate 240 and shell 210 and ensures the stability of the overall structure.

[0073] In some alternative embodiments, the cell body 110 has a wound structure, and the radius of curvature R and the difference H of the cell body 110 satisfy the following: 1.5 mm 2 ≤H×R≤180mm 2 .

[0074] It should be noted that if the H×R ratio is too large, the insulating film 120 may not be able to form a good contact with the insulating component 230 during welding. This is because an excessive height difference will cause the insulating film 120 to melt, affecting the welding quality between the cover plate 240 and the housing 210.

[0075] If the H×R ratio is too small, the second insulating surface 122 may not be able to effectively contact the insulating component 230, resulting in the inability to perform effective welding. This will reduce the positioning stability of the insulating film 120, increase the risk of the cell assembly 100 falling off during use, and thus affect the insulation performance and safety of the battery 200.

[0076] A larger R value results in a flatter cell side surface, making the insulating film 120 less prone to collapse during wrapping, thus improving the stability and welding quality of the insulating film 120. However, it also makes it harder to fit the cell into the housing 210. A smaller R value results in a more curled cell, which may cause the insulating film 120 to collapse more easily during wrapping, increasing the uncertainty in the welding process.

[0077] In some embodiments, R is greater than or equal to 4 mm and less than or equal to 30 mm.

[0078] For example, R can be 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 28mm, 30mm or any value therein.

[0079] In some embodiments, H×R can be 1.5 mm. 2 10mm 2 20mm 2 30mm 2 40mm 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 110mm 2 120mm 2 130mm 2 140mm 2 150mm 2 160mm 2 170mm 2 180mm 2 Or any of the values ​​therein.

[0080] In some alternative embodiments, the insulating film 120 has a single-layer structure;

[0081] The thickness of the insulating film 120 is greater than or equal to 0.03 mm and less than or equal to 0.35 mm. It should be noted that by limiting the thickness of the insulating film 120, it is ensured that the insulating film 120 has sufficient strength to withstand the mechanical stress that may be encountered during manufacturing and handling. This helps prevent the film from tearing or being damaged during handling, installation, or use.

[0082] In some embodiments, the thickness of the insulating film 120 can be 0.03 mm, 0.05 mm, 0.07 mm, 0.09 mm, 0.11 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.19 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.32 mm, 0.35 mm, or any value thereof.

[0083] In some embodiments, the insulating film 120 may be polyethylene (PE), which has good chemical stability and mechanical properties and is commonly used in lithium-ion battery separators 200. Its heat-melting properties can provide additional safety protection in case the battery 200 overheats.

[0084] In some embodiments, the insulating film 120 may be polypropylene (PP), which has good heat resistance and is typically used in batteries 200 that require higher temperature stability.

[0085] In some embodiments, the insulating film 120 can combine the advantages of PE and PP to form a multilayer structure to improve the overall performance of the separator. This structure can optimize different properties, such as mechanical strength and thermal stability, in different layers.

[0086] In other embodiments, a ceramic material (such as alumina, silica, etc.) is coated onto the polyolefin membrane to improve its thermal stability and safety. This coating can provide additional protection at high temperatures, preventing membrane shrinkage and failure.

[0087] Figure 7 This is a cross-sectional view of the insulating film in the battery cell assembly according to an embodiment of this application.

[0088] like Figure 7 As shown, in some optional embodiments, the insulating film 120 has a multilayer structure;

[0089] The insulating film 120 includes a flexible support 123 and at least two insulating layers 124, with the at least two insulating layers 124 respectively disposed on opposite sides of the flexible support 123.

[0090] It should be noted that the flexible support 123 provides additional mechanical support, making the insulating film 120 less prone to tearing or deformation during manufacturing, installation, and operation. The flexibility of the support allows the film to adapt to the deformation of the battery cell to a certain extent without compromising its structural integrity.

[0091] By providing insulating layers 124 on both sides of the flexible support 123, the thermal stability of the membrane can be improved. This structure helps prevent membrane shrinkage when the battery 200 overheats, thereby reducing the risk of thermal runaway.

[0092] Insulating layers 124 are provided on both sides of the support, which can effectively improve the insulation effect between the positive and negative electrodes of the battery cell and reduce the risk of short circuit.

[0093] By selecting different combinations of materials, the chemical stability of the insulating film 120 in the electrolyte can be improved, extending the lifespan of the battery 200. This multilayer structure allows for customized design based on specific application requirements. For example, different combinations of materials can be selected to optimize specific properties, such as heat resistance, mechanical strength, or chemical stability.

[0094] In some embodiments, different materials can be used to form the insulating layer 124 and the flexible support 123. For example, a ceramic coating can be used to improve thermal stability, or a polymer material can be used to enhance mechanical strength.

[0095] In some embodiments, a functional coating, such as a fire-retardant coating or an antioxidant coating, is added to the insulation layer 124 to improve safety and durability.

[0096] In some embodiments, the flexible support 123 and the insulating layer 124 are bonded together with an adhesive.

[0097] In some embodiments, the adhesive is formed after curing under conditions including but not limited to heating, moisture, air drying, or light exposure.

[0098] In one possible implementation, the adhesive is a flowable adhesive, such as an insulating adhesive, a solid adhesive, or a quick-drying adhesive.

[0099] In some alternative implementations, the flexible support 123 is a plate-like structure.

[0100] It should be noted that the plate-like structure provides a larger surface area and contact area, making the insulating film 120 more stable under mechanical stress and effectively resisting tearing and deformation, especially during the manufacturing and handling of the battery 200.

[0101] In some embodiments, the plate-like structure can optimize ion permeability by precisely controlling the thickness and porosity, thereby ensuring the efficient charge and discharge performance of the battery 200.

[0102] In addition, the plate-like support provides a robust foundation to support other functional layers of the multilayer structure, which helps to improve the durability and reliability of the insulating film 120 under various operating conditions.

[0103] Figure 8 This is a schematic diagram of the structure of the second insulating surface in the battery cell assembly according to an embodiment of this application.

[0104] like Figure 8As shown, in some optional embodiments, the second insulating surface 122 includes a first layer 1221 and a second layer 1222, the second layer 1222 wrapping the cell body 110, and the first layer 1221 wrapping the second layer 1222.

[0105] It should be noted that by providing two insulating layers 124 on the side of the cell body 110, the overall insulation effect can be significantly improved. The combination of the first layer 1221 and the second layer 1222 provides double protection, reducing the risk of internal short circuits within the cell.

[0106] The second layer 1222 directly wraps around the cell body 110, providing basic protection, while the first layer 1221 serves as an outer layer of protection, further enhancing the overall protection effect and providing better adaptability under different operating conditions.

[0107] In some alternative implementations, the height of the first layer 1221 is greater than the height of the first insulating surface 121.

[0108] It should be noted that when the second insulating surface 122 is welded to the insulating component 230, the contact area between the insulating film 120 and the insulating component 230 is increased, which helps to achieve more uniform heat conduction and pressure distribution during the welding process, thereby improving the welding quality.

[0109] By increasing the contact area, the bonding strength of the welded area is enhanced. This enhanced bonding strength can improve the mechanical strength of the weld, reduce the risk of weld detachment or failure during use, and thus improve the overall safety of the battery cell.

[0110] Furthermore, the fact that the height of the first layer 1221 is higher than that of the first insulating surface 121 means that the first layer 1221 can provide additional coverage and protection at the edge of the cell. And when the second layer 1222 collapses, it is still protected by the first layer 1221, which can also complete the welding of the first layer 1221 to the insulating component 230 to ensure the welding quality.

[0111] In addition, the extra height of the first layer 1221 can provide better insulation at the top and bottom of the cell, reducing electrical interference and short-circuit risk between the cell and the external environment.

[0112] In some alternative embodiments, the heights of both the first layer 1221 and the second layer 1222 are higher than the height of the first insulating surface 121.

[0113] It should be noted that both the first layer 1221 and the second layer 1222 are higher than the height of the first insulating surface 121, providing double-layer extended protection. Because the height of both layers exceeds the first insulating surface 121, the contact area between the insulating film 120 and the insulating component 230 is significantly increased during welding. This increased contact area helps improve the strength and stability of the weld, ensuring the reliability of the weld joint during use.

[0114] Furthermore, the extended height of the two layers provides additional insulation protection, reducing electrical interference and short-circuit risks between the battery cell and the external environment.

[0115] The battery cell assembly provided in this application includes a battery cell body; an insulating film, the insulating film including at least two connected first insulating surfaces and second insulating surfaces, the first insulating surfaces and the second insulating surfaces covering different sides of the battery cell body; the first insulating surface extends along the length direction of the battery cell body, the second insulating surface extends along the width direction of the battery cell body, wherein, along the height direction of the battery cell body, the height of the second insulating surface is higher than the height of the first insulating surface.

[0116] By designing the height of the second insulating surface to be higher than that of the first insulating surface, the contact area between the insulating film and the insulating component can be increased during the welding process, which helps to improve the strength and stability of the weld and prevent the insulating film from falling off during use.

[0117] In addition, such as Figures 1 to 4 As shown, this application embodiment also provides a battery 200, including a housing 210 and the above-described cell assembly 100;

[0118] The housing 210 has a receiving cavity in which the battery cell assembly 100 is housed.

[0119] In some examples, the housing 210 can be a rectangular structure, and the size of the housing 210 can be greater than or equal to the size of the cell assembly 100, so that the housing 210 can support the cell assembly 100.

[0120] It is understandable that the function of the receiving cavity is to house the battery cell assembly 100. It is easy to understand that the receiving cavity is sealed to prevent side reactions from occurring in the internal system of the battery cell assembly 100, which would affect the performance of the battery cell assembly 100.

[0121] For example, the size or shape of the receiving cavity is matched with the size and shape of the battery cell assembly 100. Specifically, it can be adjusted according to the actual situation, and the embodiments of this application do not impose too many limitations here.

[0122] In this embodiment, the battery cell assembly 100 can be configured as a rectangular structure. The battery cell assembly 100 can be located inside the housing 210.

[0123] Understandably, the housing 210 can be used to support the battery cell assembly 100.

[0124] The dimensions of the aforementioned housing 210 can be set according to actual needs, and this embodiment of the application does not impose any restrictions on them.

[0125] In addition, it should be noted that the shape of the shell 210 is not limited in this embodiment. For example, the shell 210 can be a regular shape such as a cuboid or a cylinder. Of course, the shell 210 can also be other irregular shapes.

[0126] In some embodiments, the housing 210 protects the battery cell assembly 100 therein. The housing 210 may be composed of two parts joined together for easy installation. The housing 210 may be a metal shell. Specifically, the material of the housing 210 may be stainless steel, which is sturdy and corrosion-resistant. Of course, the housing 210 may also be made of other materials, and this embodiment does not impose any specific limitations on this.

[0127] In some embodiments, there are at least two cell assemblies 100, and the at least two cell assemblies 100 are arranged along the width direction of the battery 200.

[0128] It should be noted that the tab and the post 220 are usually connected by an adapter, which is used to conduct the electricity from the tab to the post 220.

[0129] It should be noted that the battery 200 also includes a terminal post 220, which is inserted through the housing 210 and electrically connected to the tabs of the cell assembly 100. The main function of the terminal post 220 is to conduct the electrical current on the tabs of the cell assembly 100 to the outside of the housing 210 for easy use.

[0130] In some embodiments, the electrode post 220 is generally made of a material with good electrical conductivity, such as copper or aluminum.

[0131] In some embodiments, the battery 200 further includes an insulating member 230 and a cover plate 240, the insulating member 230 being disposed on the side of the cover plate 240 facing the cell assembly 100.

[0132] In some embodiments, the cover plate 240 is generally a metal part, and the insulating part 230 is located between the cover plate 240 and the cell assembly 100 for insulation.

[0133] It should be noted that the addition of cover plate 240 provides an additional protective layer for battery 200, enhancing the integrity of the overall structure.

[0134] The cover 240 effectively protects the battery cell assembly 100 from external environmental influences such as moisture, dust, and physical impact, thereby improving the durability and reliability of the battery 200. The cover 240 not only provides physical protection but also acts as a protective barrier for the battery 200, reducing the risk of internal short circuits and other potential safety hazards.

[0135] It should be noted that the specific structure of the battery cell assembly 100 will not be limited here, but can be referred to the above.

[0136] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0137] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electric cell assembly (100), characterized by, include: Battery cell body (110); An insulating film (120) includes at least two connected first insulating surfaces (121) and second insulating surfaces (122), the first insulating surfaces (121) and the second insulating surfaces (122) covering different sides of the battery cell body (110); The first insulating surface (121) extends along the length direction of the cell body (110), and the second insulating surface (122) extends along the width direction of the cell body (110). The height of the second insulating surface (122) is higher than the height of the first insulating surface (121) along the height direction of the cell body (110).

2. The electric cell assembly (100) according to claim 1, characterized in that Along the height direction of the cell body (110), the difference H between the height of the second insulating surface (122) and the height of the first insulating surface (121) is greater than or equal to 0.2 mm and less than or equal to 7 mm.

3. The electric cell assembly (100) of claim 2, characterized in that The electric core body (110) is a winding structure, and a relationship between a curvature radius R of the electric core body (110) and the difference value H satisfies: 1.5mm 2 ≤H×R≤180mm 2 .

4. The cell assembly (100) according to any one of claims 1 to 3, characterized in that The insulating film (120) has a single-layer structure; The thickness of the insulating film (120) is greater than or equal to 0.03 mm and less than or equal to 0.35 mm.

5. The cell assembly (100) according to any one of claims 1 to 3, characterized in that The insulating film (120) has a multilayer structure; The insulating film (120) includes a flexible support (123) and at least two insulating layers (124), with the at least two insulating layers (124) respectively disposed on opposite sides of the flexible support (123).

6. The electric cell assembly (100) of claim 5, characterized in that The flexible support (123) is a plate-like structure.

7. The cell assembly (100) according to any one of claims 1 to 3, characterized in that The second insulating surface (122) includes a first layer (1221) and a second layer (1222), the second layer (1222) wraps the cell body (110), and the first layer (1221) wraps the second layer (1222).

8. The electric cell assembly (100) of claim 7, characterized in that The height of the first layer (1221) is higher than the height of the first insulating surface (121).

9. The electric cell assembly (100) of claim 7, wherein, The heights of the first layer (1221) and the second layer (1222) are both higher than the height of the first insulating surface (121).

10. A battery (200) characterized by, Includes a housing (210) and a cell assembly (100) as described in any one of claims 1 to 9; The housing (210) has a receiving cavity in which the battery cell assembly (100) is received.

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