Batteries and electrical equipment

Abstract

The present application relates to the field of battery technology, and provides a battery and an electrical device, wherein the battery comprises an electrode assembly, a packaging bag, and a thermal conductive coating. The electrode assembly is provided with a tab, the electrode assembly is accommodated in the packaging bag, and the packaging bag is provided with the thermal conductive coating, which can transfer the heat generated at the tab of the electrode assembly to the rest of the electrode assembly, thereby making the battery temperature evenly distributed, so as to improve the charging speed of the battery.

Description

[Technical field]

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

[0002] In recent years, with the development of new energy technologies, batteries, as efficient, clean and highly recyclable energy sources, have been increasingly widely used. The development of batteries needs to take many factors into full consideration, and fast charging technology for batteries is an important development direction. High-rate charging will lead to a higher current density at the tabs, resulting in a higher temperature rise, a large temperature difference between the battery body and the tabs, and uneven polarization distribution, which seriously affects the charging speed of the battery. At present, the technology to improve battery temperature rise is mainly achieved by reducing heat generation, for example, setting up a multi-tab structure, setting up a battery shell structure to improve heat dissipation, etc., but it will cause a certain loss of battery energy, and the process is also relatively complicated. [Summary of the invention]

[0003] In order to solve the above technical problems, the embodiments of the present application provide a battery and an electrical device, which can evenly disperse the heat generated at the pole ear to the entire battery, so that the battery temperature is evenly distributed and the charging speed is improved.

[0004] The embodiment of the present application solves the technical problem by adopting the following technical solutions:

[0005] A battery is provided, comprising an electrode assembly, a packaging bag and a thermal conductive coating. The electrode assembly is provided with a tab, the packaging bag is used to accommodate the electrode assembly, the thermal conductive coating is arranged in the packaging bag, and the thermal conductive coating is used to conduct heat generated at the tab to the rest of the electrode assembly.

[0006] In some embodiments, the packaging bag includes a first packaging layer, a second packaging layer, and a third packaging layer stacked in sequence, and the first packaging layer is arranged opposite to the electrode assembly.

[0007] In some embodiments, the thermally conductive coating is disposed between the first packaging layer and the electrode assembly, and / or, the thermally conductive coating is disposed between the first packaging layer and the second packaging layer, and / or, the thermally conductive coating is disposed between the second packaging layer and the third packaging layer.

[0008] In some embodiments, the thermal conductive coating includes a first coating and a second coating, the first coating is disposed between the first packaging layer and the second packaging layer, and the second coating is disposed between the second packaging layer and the third packaging layer.

[0009] In some embodiments, the thermally conductive coating further includes a third coating, and the third coating is disposed between the first packaging layer and the electrode assembly.

[0010] In some embodiments, the thermally conductive coating includes a first coating and a second coating, the first coating is disposed between the first packaging layer and the electrode assembly, the second coating is disposed between the first packaging layer and the second packaging layer, or the second coating is disposed between the second packaging layer and the third packaging layer.

[0011] In some embodiments, the thermal conductive coating has a thickness of 10 μm-50 μm.

[0012] In some embodiments, the thermally conductive coating is disposed only on a surface of the first packaging layer opposite to the tab.

[0013] In some embodiments, the thermally conductive coating includes at least one of graphene, polystyrene, epoxy resin adhesive, thermally conductive silicone, thermally conductive graphite sheet, thermally conductive double-sided tape, and nano-carbon copper foil.

[0014] In some embodiments, the thermally conductive coating is a grid coating or a uniform coating.

[0015] In a second aspect, an electrical device is provided, comprising a battery as described in any one of the above items, wherein the battery is used to provide electrical energy.

[0016] Compared with the prior art, the battery and its electrical equipment in the embodiments of the present application house their electrode assemblies in a packaging bag, on which a thermal conductive coating is provided. The thermal conductive coating can transfer the heat generated at the pole ears of the electrode assembly to the rest of the electrode assembly, thereby making the battery temperature evenly distributed to increase the charging speed of the battery.

Brief Description of the Drawings

[0017] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0018] Figure 1 A schematic diagram of the structure of a battery provided in one embodiment of the present application;

[0019] Figure 2 for Figure 1 A schematic structural diagram of an electrode assembly of a battery shown;

[0020] Figure 3 for Figure 1 A schematic cross-sectional view of an electrode assembly and a packaging bag of a battery shown;

[0021] Figure 4 for Figure 1 A schematic cross-sectional view of a battery shown;

[0022] Figure 5 A cross-sectional schematic diagram of a battery provided in another embodiment of the present application;

[0023] Figure 6 A cross-sectional schematic diagram of a battery provided in another embodiment of the present application;

[0024] Figure 7 A cross-sectional schematic diagram of a battery provided in another embodiment of the present application.

[0025] The following is an explanation of the reference numerals:

[0026] [Specific implementation method]

[0027] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0029] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] See also Figure 1One embodiment of the present application provides a battery 100, comprising: an electrode assembly 10, a packaging bag 20, and a thermal conductive coating 30. The electrode assembly 10 is provided with a tab, the packaging bag 20 is used to accommodate the electrode assembly 10, and the thermal conductive coating 30 is disposed in the packaging bag 20, and the thermal conductive coating 30 is used to conduct the heat generated at the tab to the rest of the electrode assembly 10, so that the temperature distribution of the electrode assembly 10 is uniform.

[0031] See also Figure 2 The electrode assembly 10 includes a battery cell body 11 and a tab 12, and the tab 12 extends out of the battery cell body 11 along the length direction of the battery cell body 11. There are two tabs 12, and the two tabs 12 are a positive tab and a negative tab. When the battery 100 is working, heat will be generated at the tab 12 to form a high-temperature area A1, resulting in inconsistent overall temperature of the electrode assembly 10 and uneven polarization distribution, which affects the charging performance of the battery. In addition, the temperature rise at the center of the battery cell body 11 is relatively high, and a high-temperature area A2 will also be formed.

[0032] See also Figure 3 The packaging bag 20 includes a first packaging layer 21, a second packaging layer 22 and a third packaging layer 23 stacked in sequence, and the first packaging layer 21 is arranged opposite to the electrode assembly 10. The first packaging layer 21, the second packaging layer 22 and the third packaging layer 23 protrude from both ends of the battery body 11 along the length direction of the electrode assembly 10, respectively, and the first packaging layer 21, the second packaging layer 22 and the third packaging layer 23 are sequentially coated on the outside of the electrode assembly 10 through top and side sealing and hot pressing processes. Among them, the material of the first packaging layer 21 is polypropylene, the material of the second packaging layer 22 is aluminum, and the material of the third packaging layer 23 is polyamide fiber.

[0033] Please also read Figures 4 to 6 , the thermal conductive coating 30 is formed by coating the thermal conductive material uniformly on the packaging bag 20 through a coating device and then drying. After the packaging bag 20 is coated, it is sealed with the electrode assembly 10 on the top and side and hot pressed. According to the thermal conductivity requirements of the battery, the thermal conductive coating 30 can be coated to form a grid coating or a uniform coating. The thermal conductive material of the thermal conductive coating 30 can be adjusted according to the heat dissipation requirements and energy density requirements. The thickness of the thermal conductive coating 30 can also be designed to be different thicknesses according to different heat generation. Among them, the thermal conductive coating 30 can be graphene, polystyrene, epoxy resin adhesive, thermal conductive silicone, thermal conductive graphite sheet, thermal conductive double-sided tape, nano-carbon copper foil, etc., and the thickness of the thermal conductive coating 30 can be 10μm-50μm. In this embodiment, the thermal conductive coating 30 takes graphene as an example. Graphene can not only provide good heat dissipation, but also improve the mechanical strength of the packaging bag and increase corrosion resistance, so as to achieve the effect of consistent temperature distribution of the electrode assembly and improve the fast charging performance of the battery.

[0034] The thermally conductive coating 30 includes at least one layer of coating, and the thermally conductive coating 30 is arranged between the first packaging layer 21 and the electrode assembly 10, and / or, the thermally conductive coating 30 is arranged between the first packaging layer 21 and the second packaging layer 22, and / or, the thermally conductive coating 30 is arranged between the second packaging layer 22 and the third packaging layer 23.

[0035] In some embodiments, when the electrode assembly 10 generates less heat, the thermally conductive coating 30 may be configured as a single layer coating (eg, Figure 4 ). Specifically, the thermally conductive coating 30 includes a first coating 31, which is disposed between the first packaging layer 21 and the electrode assembly 10, and is formed by coating a thermally conductive material on a side of the first packaging layer 21 facing the electrode assembly 10. Alternatively, the first coating may also be disposed between the first packaging layer 21 and the second packaging layer 22, and is formed by coating the thermally conductive material on the first packaging layer 21 or the second packaging layer 22. Alternatively, the first coating may also be disposed between the second packaging layer 22 and the third packaging layer 23, and is formed by coating the thermally conductive material on the second packaging layer 22 and the third packaging layer 23.

[0036] In some embodiments, when the electrode assembly 10 generates a high amount of heat, the thermally conductive coating 30 may be configured as a double-layer coating (eg, Figure 5 Specifically, the thermal conductive coating 30 includes a first coating 31 and a second coating 32, wherein the first coating 31 is disposed between the first packaging layer 21 and the second packaging layer 22, and the second coating 32 is disposed between the second packaging layer 22 and the third packaging layer 23. Alternatively, the first coating may also be disposed between the electrode assembly 10 and the first packaging layer 21, and the second coating may be disposed between the first packaging layer 21 and the second packaging layer 22 or between the second packaging layer 22 and the third packaging layer 23.

[0037] In some embodiments, when the temperature rise of the electrode assembly 10 is large, the thermal conductive coating 30 can be configured as a three-layer coating (eg Figure 6 ), so as to fill the gaps between the layers of the packaging bag 20. Specifically, the thermal conductive coating 30 includes a first coating 31, a second coating 32 and a third coating 33, wherein the first coating 31 is disposed between the first packaging layer 21 and the second packaging layer 22, the second coating 32 is disposed between the second packaging layer 22 and the third packaging layer 23, and the third coating 33 is disposed between the electrode assembly 10 and the first packaging layer 21. The first coating 31, the second coating 32 and the third coating 33 are evenly distributed between the layers of the packaging bag 20 to increase the heat dissipation thickness and heat dissipation area.

[0038] See also Figure 7In some embodiments, the thermally conductive coating layer may also be disposed only on the surface of the first packaging layer 21 opposite to the pole tab 12. Specifically, the thermally conductive coating layer includes a plurality of first coating layers 31 distributed at intervals, and the plurality of first coating layers 31 are formed by coating the thermally conductive material on the side of the first packaging layer 21 facing the electrode assembly 10. The two pole tabs 12 of the electrode assembly 10 are spaced apart along the width direction of the electrode assembly 10, and the plurality of first coating layers 31 extend from one end of the electrode assembly 10 where the pole tab 12 is disposed toward the other end. Two of the first coating layers 31 are disposed on one side of the electrode assembly 10 along the thickness direction of the electrode assembly 10, and the positions of the two first coating layers 31 correspond to the positions of the two pole tabs 12 respectively; the other two first coating layers 31 are disposed on the other side of the electrode assembly 10 along the thickness direction of the electrode assembly 10, and the positions of the other two first coating layers 31 correspond to the positions of the two pole tabs 12 respectively. It can be understood that in some other embodiments, the two tabs 12 can also extend along the length direction of the electrode assembly 10 toward the two ends of the electrode assembly 10, and the thermal conductive coating can include two first coatings arranged opposite to each other along the thickness direction of the electrode assembly 10, and the two first coatings extend from one end of the electrode assembly 10 to the other end along the length direction of the electrode assembly 10, and the two first coatings respectively correspond to the positions of the two tabs 12. Among them, the length direction, width direction and thickness direction of the electrode assembly 10 are perpendicular to each other.

[0039] It should be noted that the first coating 31, the second coating 32 and the third coating 33 can be graphene, polystyrene, epoxy resin adhesive, thermally conductive silicone, thermally conductive graphite sheet, thermally conductive double-sided adhesive, nano-carbon copper foil, etc., which can be adjusted according to the heat dissipation requirements and energy density requirements. According to the temperature rise of the battery body 11, the first coating 31, the second coating 32 and the third coating 33 can also be set as a uniform coating or a grid coating.

[0040] Another embodiment of the present application further provides an electrical device, which includes the battery 100 described in any of the above embodiments, and the battery 100 is used for supplying power.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: An electrode assembly, wherein the electrode assembly is provided with a tab; A packaging bag, used to contain the electrode assembly; as well as a thermally conductive coating disposed on the packaging bag, the thermally conductive coating being used to conduct heat generated at the electrode tab to the rest of the electrode assembly; the packaging bag comprising a first packaging layer, a second packaging layer and a third packaging layer stacked in sequence, the first packaging layer being disposed opposite to the electrode assembly; The thermal conductive coating is disposed on a surface of the first packaging layer opposite to the tab; The thermally conductive coating is disposed between the first packaging layer and the electrode assembly; and / or, The thermal conductive coating is disposed between the first packaging layer and the second packaging layer; and / or, The thermal conductive coating is disposed between the second packaging layer and the third packaging layer.

2. The battery according to claim 1, characterized in that The thermal conductive coating comprises a first coating and a second coating; The first coating layer is disposed between the first packaging layer and the second packaging layer; The second coating layer is disposed between the second packaging layer and the third packaging layer.

3. The battery according to claim 2, characterized in that The thermally conductive coating further includes a third coating disposed between the first packaging layer and the electrode assembly.

4. The battery according to claim 1, characterized in that The thermal conductive coating comprises a first coating and a second coating; The second coating layer is disposed between the first packaging layer and the second packaging layer, and / or the second coating layer is disposed between the second packaging layer and the third packaging layer.

5. The battery according to any one of claims 1 to 4, characterized in that: The thickness of the thermal conductive coating is 10 μm-50 μm.

6. The battery according to claim 1, characterized in that The thermally conductive coating comprises at least one of graphene, polystyrene, epoxy resin adhesive, thermally conductive silica gel, thermally conductive graphite sheet, thermally conductive double-sided adhesive, and nano-carbon copper foil.

7. The battery according to claim 1, characterized in that The thermal conductive coating is a grid coating or a uniform coating.

8. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 7, wherein the battery is used to provide electrical energy.

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