Battery pack upper cover and battery pack

Abstract

The utility model provides a battery pack upper cover and a battery pack, and relates to the technical field of batteries. The battery pack upper cover is used for being connected with a box body, the battery pack upper cover comprises a cover body, an electrophoretic paint layer and an isolation assembly, the electrophoretic paint layer comprises a first surface and a second surface which are opposite to each other, the first surface is attached to the side, opposite to the box body, of the cover body, and the isolation assembly completely covers the second surface. The isolation assembly completely covers the second surface, which enables the isolation assembly to prevent the electrophoretic paint layer from contacting the air. And when the battery pack is subjected to thermal runaway, the electrophoretic paint layer is not in contact with air, so that the risk that the electrophoretic paint layer is on fire is reduced.

Description

Technical Field

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

[0002] With the development of battery technology, battery packs are becoming increasingly popular. A battery pack generally consists of a battery cover, a housing, and battery cells. The cells are housed in the housing, and the battery cover is attached to the housing to protect the cells from the external environment. Electrophoretic paint is a commonly used coating in the battery technology field. By forming a uniform layer of electrophoretic paint on the outer surface of the battery cover, the corrosion resistance and appearance of the battery cover can be improved.

[0003] However, if the battery pack experiences problems such as overcharging, over-discharging, or short-circuiting during use, it can cause thermal runaway. When this happens, the battery cells will eject high-temperature, high-pressure gas. Under the influence of high temperatures, the electrophoretic paint on the outside of the battery pack cover comes into contact with air, potentially igniting the paint and posing a safety risk.

[0004] To prevent electrophoretic paint from catching fire, a heat-resistant, air-insulating material is typically attached to the inner surface of the battery pack cover to reduce the amount of heat transferred to the cover, thereby preventing the electrophoretic paint from catching fire. However, existing heat-resistant, air-insulating materials often fail to maintain good stability in high-temperature environments. When a battery pack experiences thermal runaway, the high-temperature, high-pressure gas impact damages the heat-resistant, air-insulating material, rendering it ineffective and potentially damaging the insulation. This poses a significant risk of electrophoretic paint catching fire. Utility Model Content

[0005] In view of this, the present application provides a battery pack cover and a battery pack to solve, to a certain extent, the problem that when the battery pack suffers thermal runaway, the heat-resistant air-isolating material will be damaged by the impact of high-temperature and high-pressure gas, the thermal insulation effect cannot be achieved, and the electrophoretic paint still has a high risk of fire.

[0006] According to one aspect of the present application, a battery pack cover is provided, which is used to be connected to a box body. The battery pack cover includes a cover body, an electrophoretic paint layer and an isolation component. The electrophoretic paint layer includes a first surface and a second surface opposite to each other. The first surface is in contact with the side of the cover body facing away from the box body, and the isolation component completely covers the second surface.

[0007] Preferably, the isolation component includes an isolation adhesive layer, and the isolation adhesive layer is bonded to the second surface to completely cover the second surface.

[0008] Preferably, the isolation assembly further comprises a metal layer, the metal layer is bonded to the side of the isolation adhesive layer facing away from the second surface, and the metal layer completely covers the isolation adhesive layer.

[0009] Preferably, the thickness of the isolation adhesive layer is greater than the thickness of the metal layer.

[0010] Preferably, the thickness of the isolation component is 0.1 mm to 5 mm.

[0011] Preferably, the ratio of the thickness of the isolation adhesive layer to the thickness of the metal layer is 2-25.

[0012] Preferably, the battery pack upper cover further includes a heat insulating member, which is in contact with the side of the cover body facing away from the isolation assembly, and the thermal conductivity of the heat insulating member is smaller than the thermal conductivity of the cover body.

[0013] Preferably, the cover body includes a main body and a protruding portion, the main body includes a placement surface facing away from the box body, and the protruding portion is arranged on the placement surface to divide the placement surface into multiple placement areas, and the multiple placement areas are all covered by the isolation assembly.

[0014] Preferably, the battery pack cover includes a plurality of isolation components, the plurality of isolation components correspond one-to-one to the plurality of placement areas, and the isolation components cover the corresponding placement areas.

[0015] According to another aspect of the present application, a battery pack is provided, comprising the above-mentioned battery pack upper cover.

[0016] In the battery pack cover of this application, the first surface of the electrophoretic paint layer is in contact with the side of the cover body facing away from the box body, and the isolation assembly completely covers the second surface. This allows the isolation assembly to prevent the electrophoretic paint layer from coming into contact with air. In the event of thermal runaway of the battery pack, the electrophoretic paint layer will not come into contact with air, thereby reducing the risk of fire in the electrophoretic paint layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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. 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.

[0018] Figure 1 A schematic structural diagram showing a battery pack cover from one perspective according to an embodiment of the present invention;

[0019] Figure 2A schematic structural diagram showing another perspective of a battery pack cover according to an embodiment of the present invention;

[0020] Figure 3 A diagram showing the relative positions of the isolation components;

[0021] Figure 4 Shows an enlarged cross-sectional view of the battery pack cover.

[0022] Icon: 1-cover; 11-main body; 12-protrusion; 2-electrophoretic paint layer; 3-isolation component; 31-isolation adhesive layer; 32-metal layer; 4-thermal insulation. DETAILED DESCRIPTION

[0023] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0024] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0025] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0028] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0031] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] According to one aspect of the present application, a battery pack cover is provided, which is used to connect with the box body. Figures 1 to 4As shown, the battery pack cover includes a cover 1, an electrophoretic paint layer 2, and an isolation component 3. The electrophoretic paint layer 2 includes a first surface (the lower surface of the electrophoretic paint layer 2) and a second surface (the upper surface of the electrophoretic paint layer 2) facing each other. The first surface is in contact with the side of the cover 1 facing away from the box, and the isolation component 3 completely covers the second surface. The isolation component 3 prevents the electrophoretic paint layer 2 from contacting the air. In the event of thermal runaway of the battery pack, the electrophoretic paint layer 2 will not come into contact with the air, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0033] In addition, the electrophoretic paint layer 2 may be a layered structure formed by coating the cover 1 with electrophoretic paint on the side facing away from the box body. The electrophoretic paint layer 2 can protect the cover 1 from corrosion.

[0034] In the embodiments of the present application, Figure 4 As shown, the isolation assembly 3 includes an isolation adhesive layer 31. The isolation adhesive layer 31 itself has adhesive properties, allowing the isolation adhesive layer 31 to adhere to the second surface of the electrophoretic paint layer 2, thereby fixing the isolation assembly 3 to the cover body 1. The isolation adhesive layer 31 completely covers the second surface, so that the electrophoretic paint layer 2 is completely covered, thereby isolating the electrophoretic paint layer 2 from the air and reducing the risk of fire in the electrophoretic paint layer 2.

[0035] Optionally, the isolation rubber layer 31 may be made of materials such as butyl damping rubber, ceramic silicone rubber, etc.

[0036] Preferably, the isolation rubber layer 31 is a butyl damping rubber layer, which is bonded to the second surface of the electrophoretic paint layer 2, thereby providing a sealed environment for the electrophoretic paint layer 2, preventing the electrophoretic paint layer 2 from contacting air, thereby reducing the risk of fire in the electrophoretic paint layer 2. At the same time, the butyl damping rubber layer has excellent high-temperature resistance and good stability in high-temperature environments, which can prevent the butyl damping rubber layer from failing in the event of thermal runaway, ensuring that the butyl damping rubber layer effectively covers the electrophoretic paint layer 2.

[0037] Furthermore, the isolation component 3 also includes a metal layer 32. Since the isolation adhesive layer 31 itself is sticky, the metal layer 32 can be bonded to the side of the isolation adhesive layer 31 facing away from the electrophoretic paint layer 2. By providing the metal layer 32, the structural strength of the isolation component 3 is improved, and the isolation adhesive layer 31 is prevented from being separated from the second surface of the electrophoretic paint layer 2 when subjected to external impact, thereby ensuring the covering effect of the isolation component 3 on the electrophoretic paint layer 2, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0038] Optionally, the metal layer 32 may be aluminum foil, copper foil, etc. Preferably, the metal layer 32 is aluminum foil.

[0039] In the embodiment of the present application, the thickness of the isolation adhesive layer 31 is greater than the thickness of the metal layer 32 , thereby ensuring the covering effect of the isolation adhesive layer 31 on the electrophoretic paint layer 2 .

[0040] Optionally, the thickness of the isolation component 3 is 0.1mm to 5mm, that is, the total thickness of the isolation rubber layer 31 and the metal layer 32 can be 0.1mm, 1.0mm, 1.5mm, 1.6mm, 2.0mm, 2.5mm, 3.0mm, 3.2mm, 4.0mm, 4.5mm or 5.0mm, etc.

[0041] Furthermore, the ratio of the thickness of the isolation adhesive layer 31 to the thickness of the metal layer 32 is 2 to 25. For example, the ratio of the thickness of the isolation adhesive layer 31 to the thickness of the metal layer 32 can be 2, 3, 5, 8, 10, 12, 15, 18, 20 or 25.

[0042] Preferably, the isolation rubber layer 31 is a butyl damping rubber layer, the metal layer 32 is aluminum foil, the thickness of the isolation assembly 3 is 1.6 mm, and the ratio of the thickness of the butyl damping rubber layer to the thickness of the aluminum foil is 15. In this case, the thickness of the butyl damping rubber layer is 1.5 mm, and the thickness of the aluminum foil is 0.1 mm. This ensures that the butyl damping rubber layer can tightly bond to the second surface of the electrophoretic paint layer 2, while the aluminum foil has sufficient strength to prevent the butyl damping rubber layer from failing.

[0043] In the embodiment of the present application, the cover 1 includes a main body 11 and a protruding portion 12. The main body 11 is flat and includes a placement surface facing away from the housing. The protruding portion 12 is disposed on the placement surface. The protruding portion 12 divides the portion of the placement surface not provided with the protruding portion 12 into multiple placement areas. The areas of the multiple placement areas can be the same or different. Each placement area is provided with an electrophoretic paint layer 2, and the multiple placement areas are covered by an isolation assembly 3. The isolation assembly 3 covers the multiple placement areas, thereby covering the electrophoretic paint layer 2 and isolating the electrophoretic paint layer 2 from the air, thereby reducing the risk of electrophoretic paint ignition.

[0044] Furthermore, in a battery pack including a battery pack cover, the placement area corresponds to the area in the box where the battery cells are placed. When thermal runaway occurs in the battery pack, the high-temperature and high-pressure gas ejected from the battery cells will impact the position corresponding to the placement area of ​​the cover 1. By covering the electrophoretic paint layer 2 on the placement area with the isolation component 3, the electrophoretic paint layer 2 can be isolated from the air, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0045] Optionally, the battery pack cover may include one or more isolation components 3. When the battery pack cover includes an isolation component 3, the side of the cover body 1 facing away from the box body may be covered by the isolation component 3, that is, multiple placement areas and the side of the protrusion 12 facing away from the box body are all covered by the isolation component 3. At this time, the electrophoretic paint layer 2 arranged on the placement area can be covered by the isolation component 3, thereby isolating the electrophoretic paint layer 2 from the air.

[0046] When the battery pack cover includes multiple isolation assemblies 3, the number of isolation assemblies 3 is the same as the number of placement areas, and the multiple isolation assemblies 3 correspond to the multiple placement areas one-to-one. The area of ​​the surface of the isolation assembly 3 facing the corresponding placement area is greater than or equal to the area of ​​the corresponding placement area, so that the placement area can be covered by the corresponding isolation assembly 3. Optionally, the shapes of the multiple isolation assemblies 3 can be the same or different, and the specific shape of the isolation assembly 3 can be adjusted based on the shape of the installation area.

[0047] In addition, the battery pack cover may further include a thermal insulation member 4, which is bonded to the side of the cover body 1 facing away from the isolation assembly 3, and the thermal conductivity of the thermal insulation member 4 is less than that of the cover body 1. By providing the thermal insulation member 4, the amount of heat transferred to the cover body 1 during thermal runaway can be reduced, thereby further reducing the risk of fire in the electrophoretic paint layer 2. When thermal runaway occurs and the thermal insulation member 4 is not damaged, the thermal insulation member 4 can reduce the amount of heat transferred to the electrophoretic paint layer 2, while the isolation assembly 3 can prevent the electrophoretic paint layer 2 from contacting the air, thereby reducing the risk of fire in the electrophoretic paint layer 2; when high-temperature and high-pressure gas impacts the thermal insulation member 4, causing the thermal insulation member 4 to be damaged, the isolation assembly 3 can still prevent the electrophoretic paint layer 2 from contacting the air, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0048] Optionally, the thermal insulation member 4 may be a mica sheet or the like.

[0049] In the battery pack cover of the present application, the first surface of the electrophoretic paint layer 2 is in contact with the side of the cover 1 facing away from the box, and the isolation component 3 completely covers the second surface. The isolation component 3 can prevent the electrophoretic paint layer 2 from coming into contact with air. When a battery pack including the battery pack cover of the present application experiences thermal runaway, the electrophoretic paint layer 2 will not come into contact with air, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0050] According to another aspect of the present application, a battery pack is provided, comprising the aforementioned battery pack cover, a housing, and a plurality of battery cells. The plurality of battery cells are disposed within the housing, and the battery pack cover is disposed on the housing to protect the battery cells. In the event of thermal runaway of the battery pack, the isolation assembly 3 can isolate the electrophoretic paint layer 2 from the air, thereby reducing the risk of fire in the electrophoretic paint layer 2.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, 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 invention.

Claims

1. A battery pack cover, which is used to connect to a box body, characterized in that: The battery pack cover includes a cover body, an electrophoretic paint layer and an isolation component. The electrophoretic paint layer includes a first surface and a second surface opposite to each other. The first surface is in contact with the side of the cover body facing away from the box body, and the isolation component completely covers the second surface.

2. The battery pack cover according to claim 1, characterized in that: The isolation component includes an isolation adhesive layer, and the isolation adhesive layer is bonded to the second surface to completely cover the second surface.

3. The battery pack cover according to claim 2, characterized in that: The isolation assembly further includes a metal layer, which is bonded to the side of the isolation adhesive layer facing away from the second surface, and the metal layer completely covers the isolation adhesive layer.

4. The battery pack cover according to claim 3, characterized in that: The thickness of the isolation adhesive layer is greater than the thickness of the metal layer.

5. The battery pack cover according to claim 3 or 4, characterized in that: The thickness of the isolation component is 0.1 mm to 5 mm.

6. The battery pack cover according to claim 5, characterized in that: The ratio of the thickness of the isolation adhesive layer to the thickness of the metal layer is 2-25.

7. The battery pack cover according to claim 1, characterized in that: The battery pack upper cover also includes a heat insulating member, which is in contact with the side of the cover body facing away from the isolation assembly. The thermal conductivity of the heat insulating member is smaller than the thermal conductivity of the cover body.

8. The battery pack cover according to claim 1, characterized in that: The cover includes a main body and a protruding portion. The main body includes a placement surface facing away from the box body. The protruding portion is arranged on the placement surface to divide the placement surface into multiple placement areas. The multiple placement areas are all covered by the isolation assembly.

9. The battery pack cover according to claim 8, characterized in that: The battery pack cover includes a plurality of isolation components, each of which corresponds to each of the plurality of placement areas, and the isolation components cover the corresponding placement areas.

10. A battery pack, characterized in that: The battery pack includes the battery pack cover according to any one of claims 1 to 9.

Images