Battery structure, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a battery structure, a battery pack and electric equipment, the battery structure comprises a composite foil material, the composite foil material comprises a copper foil, an aluminum foil and a PET film, the copper foil is configured on one side of the PET film, and the aluminum foil is configured on the other side of the PET film. The copper foil and the aluminum foil are located on the two opposite sides of the PET film respectively, then the copper foil and the aluminum foil are coated with corresponding materials, the copper foil and the aluminum foil are combined and stacked together to form a complete battery structure, compared with a traditional battery, an isolating membrane can be omitted, the space utilization rate is increased, and then the energy density of the battery structure is increased.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, in addition to improving battery safety, battery energy density is also an issue that cannot be ignored. Therefore, how to improve battery energy density is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery structure, a battery pack and an electrical device, which eliminate the need for an isolation membrane compared to traditional batteries, thereby improving space utilization and thereby increasing the energy density of the battery structure.

[0005] In a first aspect, an embodiment of the present application provides a battery structure, comprising: a composite foil material, wherein the composite foil material comprises copper foil, aluminum foil and a PET film, wherein the copper foil is configured on one side of the PET film, and the aluminum foil is configured on the other side of the PET film.

[0006] In the above implementation process, the copper foil and the aluminum foil are respectively located on opposite sides of the PET film, and then the corresponding materials are coated on the copper foil and the aluminum foil, and they are combined and stacked together to form a complete battery structure. Compared with traditional batteries, the isolation film is eliminated, the space utilization is improved, and the energy density of the battery structure is thereby increased.

[0007] In some embodiments, the battery structure further includes a positive electrode material, which is coated on the side of the aluminum foil facing away from the PET film. Coating the positive electrode material on the aluminum foil not only allows ion migration but also achieves lightweighting, thereby making the cost lower.

[0008] In some embodiments, the battery structure further includes a negative electrode material, which is coated on the side of the copper foil facing away from the PET film. Coating the copper foil with the negative electrode material not only allows for ion migration, but also eliminates the need for a separator compared to traditional batteries, while also achieving a lighter weight and lowering costs.

[0009] In some embodiments, the composite foil is configured in a plurality of ways, and the plurality of composite foils are arranged along a first direction, which allows ions to migrate through the pores of the composite foil while eliminating the need for a separator. Compared with traditional batteries, the composite foil is lighter and more cost-effective.

[0010] In some embodiments, two adjacent composite foils are arranged in reverse in the first direction and coated with the same material, so that the composite foils coated with the material can be stacked, and ions can eventually migrate through the pores, thereby reducing weight and cost.

[0011] In some embodiments, the aluminum foil is electroplated on the side of the PET film facing away from the copper foil, which can ensure that the thickness of the composite foil is thinner, facilitate lightweight design, reduce the space occupied by the composite foil, and thus increase the energy density of the battery structure.

[0012] In some embodiments, the copper foil is electroplated on the side of the PET film facing away from the aluminum foil, which can ensure that the thickness of the composite foil is thinner, facilitate lightweight design, reduce the space occupied by the composite foil, and thus increase the energy density of the battery structure.

[0013] In some embodiments, the copper foil and the aluminum foil at least partially overlap, which facilitates subsequent welding of the composite foil and ensures safety.

[0014] In a second aspect, the present application also provides a battery pack comprising a battery structure as described in any one of the above items.

[0015] Since the battery pack provided in the second aspect includes a battery structure, the battery pack has all the technical effects of the battery structure and will not be described in detail here.

[0016] In a third aspect, the present application also provides an electrical device comprising the battery pack as described above.

[0017] Since the electrical equipment provided in the third aspect includes a battery pack, the electrical equipment has all the technical effects of the battery pack and will not be described in detail here.

[0018] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by practicing the above-mentioned technology of the present disclosure.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the battery structure provided in an embodiment of the present application;

[0022] Figure 2 for Figure 1 CC cross-sectional view;

[0023] Figure 3 A schematic diagram of the structure of the composite foil coated with positive and negative electrode materials of the battery structure provided in an embodiment of the present application;

[0024] Figure 4 for Figure 3 BB cross-sectional view;

[0025] Figure 5 A schematic diagram of the structure of the composite foil material of the battery structure provided in an embodiment of the present application;

[0026] Figure 6 for Figure 5 AA cross-sectional view.

[0027] Reference numerals

[0028] 100. Composite foil; 101. PET film; 102. Copper foil; 103. Aluminum foil; 200. Negative electrode material; 300. Positive electrode material. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0030] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0031] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or point connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0034] Example

[0035] In the design of secondary batteries, the separator and current collector (including copper foil and aluminum foil) are crucial components, directly impacting the battery's production process, electrical performance, and safety. Copper foil, a common current collector for the negative electrode, has high ductility and tensile strength, and is typically used in thicknesses of 5 to 10 μm. Aluminum foil, a common current collector for the positive electrode, has lower ductility and tensile strength than copper foil and is typically used in thicknesses of 10 to 20 μm. The separator is typically 10 to 20 μm thick.

[0036] Currently commercialized secondary batteries are made by assembling positive and negative electrodes and a separator in a stacked or wound form, then injecting an electrolyte and encapsulating the battery. A separator is placed between the positive and negative electrodes to prevent direct connection between the positive and negative electrodes of the battery, which could cause a short circuit. However, this type of battery internal structure design is not only relatively complex to assemble and process, making it difficult to adapt to various ultra-thin or special-shaped sizes, but also because of the large gap between the positive and negative electrodes and the separator, the interfacial impedance between the positive and negative electrodes is large, resulting in poor cycle performance, low battery space utilization, and low energy density.

[0037] In view of this, if Figures 1-6 As shown, in the first aspect, an embodiment of the present application provides a battery structure, including: a composite foil 100, the composite foil 100 includes a copper foil 102, an aluminum foil 103 and a PET film 101, the copper foil 102 is configured on one side of the PET film 101, and the aluminum foil 103 is configured on the other side of the PET film 101.

[0038] For example, the PET film 101 has the excellent properties of high transparency, non-toxic and odorless, high tensile strength, good stiffness, resistance to burning and cracking, not easy to break, excellent electrical and optical properties, good oxygen and moisture resistance, cold resistance, heat resistance, corrosion resistance, and stable shrinkage.

[0039] The thickness of the copper foil 102 and the aluminum foil 103 can be set to be the same or different. For example, the thickness of the copper foil 102 is 1 to 20 μm, the thickness of the aluminum foil 103 is 1 to 20 μm, the pore size of the copper foil 102 and the aluminum foil 103 is 1 to 100 μm, and the porosity is 10 to 80%. Of course, the specific parameters of the copper foil 102 and the aluminum foil 103 can be set according to the battery structure and are not specifically limited here.

[0040] In the above implementation process, the copper foil 102 and the aluminum foil 103 are respectively located on opposite sides of the PET film 101, and then the corresponding materials are coated on the copper foil 102 and the aluminum foil 103, so that they are combined and stacked together to form a complete battery structure. Compared with traditional batteries, the isolation film is eliminated, the space utilization is improved, and the energy density of the battery structure is thereby increased.

[0041] like Figure 1-Figure 4As shown, the battery structure further includes a positive electrode material 300, which is coated on the side of the aluminum foil 103 facing away from the PET film 101. For example, the thickness of the positive electrode material 300 is 50 to 100 μm, although the thickness of the positive electrode material 300 may be set to be greater than 100 μm or less than 50 μm. Coating the positive electrode material 300 on the aluminum foil 103 not only allows the migration of ions (including but not limited to lithium ions), but also achieves lightweighting, thereby reducing costs.

[0042] In some embodiments, the battery structure further includes a negative electrode material 200, which is coated on the side of the copper foil 102 facing away from the PET film 101. For example, the thickness of the negative electrode material 200 is 50 to 100 μm, although the thickness of the negative electrode material 200 may be greater than 100 μm or less than 50 μm. Coating the negative electrode material 200 on the copper foil 102 not only allows for the migration of ions (including but not limited to lithium ions), eliminates the need for a separator compared to traditional batteries, and also achieves lightweight construction, thereby reducing costs.

[0043] like Figure 1 As shown, the composite foil 100 is configured with a plurality of composite foils 100 arranged along a first direction, wherein the first direction includes but is not limited to the vertical direction. Ions can be allowed to migrate through the pores of the composite foil 100 while eliminating the need for a separator. Compared to traditional batteries, the composite foil 100 is lighter and more cost-effective.

[0044] In some embodiments, two adjacent composite foils 100 are arranged facing forward and backward in the first direction, and the same material is coated between the two composite foils 100. This enables the composite foils 100 coated with materials to be stacked, and ultimately ions migrate through the pores, thereby reducing weight and cost.

[0045] Please refer to Figure 1For example, the composite foil material 100 at the top layer is arranged in such a manner that the aluminum foil 103 is connected to the upper end of the PET film 101, and the side of the aluminum foil 103 facing away from the PET film 101 is coated with the positive electrode material 300, and the copper foil 102 is connected to the lower end of the PET film 101, and the side of the copper foil 102 facing away from the PET film 101 is coated with the negative electrode material 200, so as to form a positive arrangement; and the composite foil material 100 adjacent to the top layer is arranged in a positive direction. 0 placement is that the copper foil 102 is connected to the upper end of the PET film 101, and the side of the copper foil 102 facing away from the PET film 101 is coated with the negative electrode material 200, so that the two adjacent composite foils 100 are stacked through two layers of the negative electrode material 200, and the aluminum foil 103 is connected to the upper end of the PET film 101, and the side of the aluminum foil 103 facing away from the PET film 101 is coated with the positive electrode material 300, forming a reverse placement, and this reciprocating.

[0046] In some embodiments, the aluminum foil 103 is electroplated on the side of the PET film 101 facing away from the copper foil 102. This ensures that the composite foil 100 is thinner, facilitates lightweight design, reduces the space occupied by the composite foil 100, and thus improves the energy density of the battery structure.

[0047] In some embodiments, the copper foil 102 is electroplated on the side of the PET film 101 facing away from the aluminum foil 103. This ensures that the composite foil 100 is thinner, facilitates lightweight design, reduces the space occupied by the composite foil 100, and thus improves the energy density of the battery structure.

[0048] like Figures 1-6 As shown, the copper foil 102 and the aluminum foil 103 at least partially overlap in structure; taking the left and right directions as an example, the left side of the PET film 101 can be flush with one of the copper foil 102 and the aluminum foil 103, and the right side of the PET film 101 can be flush with the other of the copper foil 102 and the aluminum foil 103. After the copper foil 102 and the aluminum foil 103 are connected to the PET film 101, at least part of the structure of the copper foil 102 and the aluminum foil 103 is staggered. Therefore, after the positive and negative electrode materials 200 are coated on both, the copper foil 102 and the aluminum foil 103 extend to the outside of the material, which is beneficial to the subsequent welding of the composite foil 100 to ensure safety.

[0049] In a second aspect, the present application also provides a battery pack comprising the battery structure as described above.

[0050] Since the battery pack provided in the second aspect includes a battery structure, the battery pack has all the technical effects of the battery structure and will not be described in detail here.

[0051] In a third aspect, the present application also provides an electrical device comprising the battery pack as described above.

[0052] Exemplarily, the battery pack is used to provide electrical energy to the electrical device, which may be a vehicle, portable device, ship, spacecraft, electric toy, or electric tool. Vehicles may be fuel-powered vehicles, gas-powered vehicles, or new energy vehicles; new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles; spacecraft include aircraft, rockets, space shuttles, and spacecraft; and electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. The present application does not impose any particular restrictions on the aforementioned electrical devices.

[0053] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0054] The vehicle is equipped with a battery pack, which can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle. For example, the battery pack can serve as the vehicle's operating power source and be used in the vehicle's circuit system, such as for starting, navigation, and operating power requirements of the vehicle.

[0055] The vehicle may also include a controller and a motor, where the controller is used to control the battery pack to power the motor, for example, to meet the vehicle's operating power requirements during starting, navigation, and driving.

[0056] In some embodiments of the present application, the battery pack can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0057] Since the electrical equipment provided in the third aspect includes a battery pack, the electrical equipment has all the technical effects of the battery pack and will not be described in detail here.

[0058] In all embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms will not be elaborated in the embodiments of the present application.

[0059] It should be understood that the phrases “in this embodiment,” “in an embodiment of the present application,” or “as an optional implementation” mentioned throughout the specification mean that specific features, structures, or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, “in this embodiment,” “in an embodiment of the present application,” or “as an optional implementation” appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0060] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0061] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A battery structure, characterized in that: include: A composite foil material, comprising copper foil, aluminum foil, and a PET film, wherein the copper foil is disposed on one side of the PET film and the aluminum foil is disposed on the other side of the PET film; The battery structure further includes a positive electrode material, which is coated on a side of the aluminum foil facing away from the PET film; The battery structure further includes a negative electrode material, which is coated on a side of the copper foil facing away from the PET film; There are a plurality of composite foils, and the composite foils are arranged along a first direction; In the first direction, two adjacent composite foils are arranged front to back, and the same material is coated between the two composite foils.

2. The battery structure according to claim 1, characterized in that: The aluminum foil is electroplated on the side of the PET film facing away from the copper foil.

3. The battery structure according to claim 1, characterized in that: The copper foil is electroplated on the side of the PET film facing away from the aluminum foil.

4. The battery structure according to claim 1, characterized in that: The copper foil and the aluminum foil at least partially overlap in structure.

5. A battery pack, characterized in that: The battery structure comprises the battery structure according to any one of claims 1 to 4.

6. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 5.

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