Bottom protection plate and battery pack

Abstract

The utility model provides a bottom protection plate and a battery pack, and relates to the technical field of batteries, the bottom protection plate is applied to the battery pack, and comprises an anti-corrosion layer, a metal layer and a heat insulation layer; the anti-corrosion layer and the heat insulation layer are attached to the two opposite sides of the metal layer respectively. The metal layer is coated between the anti-corrosion layer and the heat insulation layer; and the heat insulation layer is arranged towards a battery cell in the battery pack. The metal layer is wrapped between the anti-corrosion layer and the heat insulation layer, the influence of external factors on the metal layer can be reduced, the bottom protection plate has good structural strength and heat insulation performance, meanwhile, the anti-corrosion capacity of the bottom protection plate is improved, the risk that the metal layer is rusted and corroded is reduced, and the service life of the bottom protection plate is prolonged. In addition, the mode that the metal layer is coated with the anti-corrosion layer and the heat insulation layer is adopted, the surface treatment process of the metal layer can be omitted, the anti-corrosion capacity of the bottom protection plate is improved, and meanwhile the production cost of the bottom protection plate is reduced.

Description

Technical Field

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

[0002] In the prior art, the underbody shield assembly of a power battery pack typically utilizes a composite design of metal plates, PVC coatings, and mica sheets. To ensure the underbody shield assembly meets the requirements of the 720°C salt spray test, the metal plate surface undergoes pre-processing by electrophoresis and powder coating. However, this increases the risk of surface corrosion and rust over time. Utility Model Content

[0003] The embodiments of the present application provide a bottom guard plate and a battery pack, which reduce the risk of corrosion and rust on the metal plate surface and extend the service life of the bottom guard plate.

[0004] In a first aspect, an embodiment of the present application provides a bottom guard plate applied to a battery pack, comprising an anti-corrosion layer, a metal layer, and a heat-insulating layer;

[0005] The anti-corrosion layer and the heat-insulating layer are respectively attached to opposite sides of the metal layer;

[0006] The metal layer is coated between the anti-corrosion layer and the heat insulation layer;

[0007] The thermal insulation layer is used to be arranged toward the battery cells in the battery pack.

[0008] In some embodiments, the anti-corrosion layer, the metal layer, and the thermal insulation layer are bonded by thermocompression.

[0009] In some embodiments, the bottom guard plate further comprises a first adhesive layer and a second adhesive layer;

[0010] The first adhesive layer is disposed between the anti-corrosion layer and the metal layer;

[0011] The second adhesive layer is disposed between the metal layer and the heat insulation layer.

[0012] In some embodiments, the edge of the anti-corrosion layer is circumferentially connected to the edge of the thermal insulation layer so as to enclose the metal layer between the anti-corrosion layer and the thermal insulation layer.

[0013] In some embodiments, a plurality of connection holes penetrating the anti-corrosion layer and the heat insulation layer are provided on the circumferential edge of the bottom guard plate.

[0014] In some embodiments, the corrosion protection layer comprises a glass fiber reinforced polypropylene sheet;

[0015] and / or, the metal layer comprises a steel plate;

[0016] And / or, the thermal insulation layer comprises mica board.

[0017] In some embodiments, a clearance hole is opened on the bottom guard plate, which passes through the anti-corrosion layer, the metal layer and the thermal insulation layer.

[0018] In some embodiments, the evacuation holes include a first evacuation hole opened on the anti-corrosion layer, a second evacuation hole opened on the metal layer, and a third evacuation hole opened on the thermal insulation layer.

[0019] In some embodiments, the circumferential edge of the first evacuation hole and the circumferential edge of the third evacuation hole are connected in a fitting manner to enclose the metal layer between the anti-corrosion layer and the heat insulation layer.

[0020] In a second aspect, an embodiment of the present application provides a battery pack comprising the bottom guard plate as described above.

[0021] Beneficial effects of the embodiments of the present application:

[0022] In an embodiment of the present application, the bottom guard plate applied to the battery pack includes an anti-corrosion layer, a metal layer and a thermal insulation layer, wherein the anti-corrosion layer and the thermal insulation layer are respectively laminated on opposite sides of the metal layer so that the metal layer is sandwiched between the anti-corrosion layer and the thermal insulation layer, and the metal layer is coated between the anti-corrosion layer and the thermal insulation layer. The anti-corrosion layer can provide corrosion resistance and improve the corrosion resistance of the metal layer. The thermal insulation layer is used to be arranged toward the battery cells in the battery pack, so that it can play a heat-insulating role and reduce the impact of high-temperature and high-pressure gas on the bottom guard plate when the battery cells in the battery pack are in thermal runaway. The metal layer has a high structural strength and can ensure the structural stability of the bottom guard plate. By coating the metal layer between the anti-corrosion layer and the thermal insulation layer, the influence of external factors on the metal layer can be reduced, so that the bottom guard plate has both good structural strength and thermal insulation performance, while improving the corrosion resistance of the bottom guard plate, reducing the risk of rust and corrosion of the metal layer, and extending the service life of the bottom guard plate. In addition, the method of covering the metal layer with an anti-corrosion layer and a heat-insulating layer can also eliminate the surface treatment process of the metal layer, thereby improving the anti-corrosion ability of the bottom guard plate and reducing the production cost of the bottom guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the exploded structure of the bottom guard plate provided in an embodiment of the present application;

[0025] Figure 2 Schematic diagram of the structure of a composite structure formed by stacking an anti-corrosion layer and a metal layer provided in an embodiment of the present application;

[0026] Figure 3 Schematic diagram of the structure of the composite structure and the thermal insulation layer provided in the embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the top view of the bottom guard plate provided in an embodiment of the present application;

[0028] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0029] Figure 6 yes Figure 4 Cross-sectional view at AA in the middle;

[0030] Figure 7 It is a schematic structural diagram of the battery pack provided in an embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Anti-corrosion layer; 11. First clearance hole; 2. Metal layer; 21. Second clearance hole; 3. Heat insulation layer; 31. Third clearance hole; 100. Bottom guard plate; 110. Clearance hole; 120. Connection hole; 200. Battery pack; 210. Battery cell. DETAILED DESCRIPTION

[0033] 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 part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0034] like Figure 1As shown, an embodiment of the present application provides a bottom guard plate 100, which is applied to a battery pack 200, wherein the anti-corrosion layer 1 and the thermal insulation layer 3 are respectively bonded and arranged on opposite sides of the metal layer 2; the metal layer 2 is coated between the anti-corrosion layer 1 and the thermal insulation layer 3, and the thermal insulation layer 3 is used to be arranged toward the battery cells 210 in the battery pack 200. That is, the anti-corrosion layer 1, the metal layer 2 and the thermal insulation layer 3 are stacked in sequence, the metal layer 2 is sandwiched between the anti-corrosion layer 1 and the thermal insulation layer 3, and the metal layer 2 is coated by the anti-corrosion layer 1 and the thermal insulation layer 3, and the anti-corrosion layer 1 and the thermal insulation layer 3 are respectively bonded and connected to opposite sides of the metal layer 2, thereby forming a whole. Since the metal layer 2 is coated between the anti-corrosion layer 1 and the thermal insulation layer 3, it is possible to avoid direct contact between the metal layer 2 and the outside world, thereby improving the corrosion resistance of the metal layer 2 and reducing the risk of corrosion and rust of the metal layer 2.

[0035] Among them, the anti-corrosion layer 1 can adopt a plate with protective function, which is used to improve the corrosion resistance, aging resistance, acid and alkali resistance and other properties of the bottom guard plate 100, reduce the impact of the outside world on the battery pack 200 during storage and operation of the battery pack 200, and protect the metal layer 2, reducing or avoiding the risk of rust and corrosion of the metal layer 2.

[0036] The metal layer 2 can be made of a metal plate with high strength and strong plastic deformation ability to provide higher structural strength for the bottom guard plate 100, so that the bottom guard plate 100 can resist external impact and reduce the impact of external bumps on the battery cells 210 in the battery pack 200.

[0037] The thermal insulation layer 3 can be made of a plate material with high thermal insulation performance, high temperature resistance, and both insulation performance and mechanical strength. It can reduce the impact of high-temperature and high-pressure gas on the bottom guard plate 100 when the battery cells 210 in the battery pack 200 are in thermal runaway, and help to improve the structural strength of the bottom guard plate 100.

[0038] Exemplarily, the cross-sectional areas of the anti-corrosion layer 1 and the thermal insulation layer 3 in the first direction X are both larger than the cross-sectional area of the metal layer 2 in the first direction X. When the anti-corrosion layer 1, the metal layer 2 and the thermal insulation layer 3 are stacked, a receiving portion for accommodating the metal layer 2 can be formed between the anti-corrosion layer 1 and the thermal insulation layer 3, thereby encapsulating the metal layer 2 in the above-mentioned receiving portion to achieve encapsulation of the metal layer 2.

[0039] In an embodiment of the present application, the bottom guard plate 100 applied to the battery pack 200 includes an anti-corrosion layer 1, a metal layer 2 and a thermal insulation layer 3, wherein the anti-corrosion layer 1 and the thermal insulation layer 3 are respectively adhered to opposite sides of the metal layer 2, so that the metal layer 2 is sandwiched between the anti-corrosion layer 1 and the thermal insulation layer 3, and the metal layer 2 is coated between the anti-corrosion layer 1 and the thermal insulation layer 3. The anti-corrosion layer 1 can provide corrosion resistance and improve the corrosion resistance of the metal layer 2. The thermal insulation layer 3 is used to be arranged toward the battery cells 210 in the battery pack 200, so as to play a heat insulating role and reduce the impact of high-temperature and high-pressure gas on the bottom guard plate 100 when the battery cells 210 in the battery pack 200 are in thermal runaway. The metal layer 2 has a high structural strength and can ensure the structural stability of the bottom guard plate 100. By encasing the metal layer 2 between the anti-corrosion layer 1 and the thermal insulation layer 3, the effects of external factors on the metal layer 2 can be reduced, allowing the bottom guard plate 100 to have both good structural strength and thermal insulation properties while improving the corrosion resistance of the bottom guard plate 100, reducing the risk of rust and corrosion of the metal layer 2, and extending the service life of the bottom guard plate 100. In addition, by encasing the metal layer 2 with the anti-corrosion layer 1 and the thermal insulation layer 3, the surface treatment process of the metal layer 2 can be eliminated, thereby improving the corrosion resistance of the bottom guard plate 100 while reducing the production cost of the bottom guard plate 100.

[0040] In some embodiments, the anti-corrosion layer 1, metal layer 2, and thermal insulation layer 3 are joined by hot pressing. This hot pressing method allows for a tight bond between the anti-corrosion layer 1, metal layer 2, and thermal insulation layer 3, made of different materials, through high temperature and high pressure. This method also improves mechanical properties such as strength, hardness, and toughness, enhancing the structural strength of the bottom guard plate 100. After hot pressing, the anti-corrosion layer 1, metal layer 2, and thermal insulation layer 3 are seamless, improving the stability and durability of the bottom guard plate 100.

[0041] For example, the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 can be connected by heating and rolling. That is, during the rolling process, the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 are heated to a desired temperature by a heating system, thereby improving the connection strength.

[0042] In this embodiment, the anti-corrosion layer 1 and the thermal insulation layer 3 arranged on the opposite sides of the metal layer 2 replace the pre-processing treatments such as electrophoresis and powder spraying performed on the bottom guard plate 100 in the related art, thereby avoiding the risk of corrosion and rust on the surface of the bottom guard plate 100 caused by the easy falling off of electrophoresis and powder spraying during use, and ensuring the thermal insulation and corrosion resistance of the bottom guard plate 100.

[0043] In some embodiments, the bottom guard plate 100 further includes a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed between the anti-corrosion layer 1 and the metal layer 2, and the second adhesive layer is disposed between the metal layer 2 and the thermal insulation layer 3. In other words, the anti-corrosion layer 1 and the metal layer 2 are bonded via the first adhesive layer, and the metal layer 2 and the thermal insulation layer 3 are bonded via the second adhesive layer. This allows the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 to form a more integrated whole, thereby improving bonding strength.

[0044] When the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 are thermoformed, the presence of the first and second adhesive layers allows the first and second adhesive layers to be thermoformed together with the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 to form a single unit. While the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 are bonded together as a single unit by the first and second adhesive layers, thermoforming further enhances the tightness of the connection, thereby increasing the structural strength of the bottom guard plate 100.

[0045] In some embodiments, the circumferential edge of the anti-corrosion layer 1 is circumferentially bonded to the circumferential edge of the thermal insulation layer 3, so that the metal layer 2 is enclosed between the anti-corrosion layer 1 and the thermal insulation layer 3. The circumferential edge of the anti-corrosion layer 1 is circumferentially bonded to the circumferential edge of the thermal insulation layer 3, thereby forming a closed space between the anti-corrosion layer 1 and the thermal insulation layer 3, enclosing the metal layer 2 in the space, thereby improving the protection capability of the metal layer 2.

[0046] For example, the anti-corrosion layer 1, the metal layer 2 and the heat-insulating layer 3 may be in a rectangular, circular or other shape.

[0047] like Figure 1 As shown, the anti-corrosion layer 1, the metal layer 2 and the heat-insulating layer 3 are all rectangular, and the cross-sectional areas of the anti-corrosion layer 1 and the heat-insulating layer 3 in the first direction X are the same and larger than the cross-sectional area of the metal layer 2 in the first direction X. Figure 2 As shown, when the anti-corrosion layer 1 and the metal layer 2 are stacked, since the cross-sectional area of the anti-corrosion layer 1 in the first direction X is larger than the cross-sectional area of the metal layer 2 in the first direction X, the metal layer 2 does not cover the peripheral area of the anti-corrosion layer 1. Figure 3 As shown, the area of the thermal insulation layer 3 is the same as that of the anti-corrosion layer 1. When the thermal insulation layer 3 is stacked on the metal layer 2 so that the thermal insulation layer 3 and the anti-corrosion layer 1 are located on opposite sides of the metal layer 2, the edge circumferential areas of the anti-corrosion layer 1 and the thermal insulation layer 3 that are not covered by the metal layer 2 are bonded together, thereby forming a receiving portion for receiving the metal layer 2. The metal layer 2 is enclosed in the receiving portion, thereby preventing the metal layer 2 from direct contact with the outside world.

[0048] like Figure 6 As shown, the metal layer 2 is enclosed in the accommodation portion formed by the anti-corrosion layer 1 and the heat insulation layer 3 .

[0049] The anti-corrosion layer 1, the metal layer 2 and the heat-insulating layer 3 can also be circular. When they are circular, the overall arrangement is similar to that of a rectangle, which will not be described in detail here.

[0050] It is understandable that the anti-corrosion layer 1 , the metal layer 2 and the thermal insulation layer 3 may also be set to other shapes according to the shape of the battery pack 200 .

[0051] In some embodiments, as Figure 5 As shown, a plurality of connection holes 120 penetrating the anti-corrosion layer 1 and the thermal insulation layer 3 are provided on the circumferential direction of the edge of the bottom guard plate 100. The connection holes 120 can be used to connect the bottom guard plate 100 to other components in the battery pack 200. The connection holes 120 are provided on the circumferential direction of the edge of the bottom guard plate 100, penetrating the anti-corrosion layer 1 and the thermal insulation layer 3. When the bottom guard plate 100 is connected to other components in the battery pack 200, the connection stability of the anti-corrosion layer 1 and the thermal insulation layer 3 can be further improved. Moreover, since the connection holes 120 penetrate the metal layer 2, the metal layer 2 will not be exposed to the outside world from the inner side wall of the connection holes 120, thereby improving the protection performance of the metal layer 2.

[0052] In some embodiments, the anti-corrosion layer 1 comprises a glass fiber reinforced polypropylene sheet. Glass fiber reinforced polypropylene sheet is a composite material sheet made by adding glass fiber to enhance the performance of polypropylene. It combines the lightweight, corrosion-resistant, and impact-resistant properties of polypropylene with the high strength and high modulus of glass fiber, resulting in excellent overall performance. When applied to the underbody guard 100, it can enhance the corrosion resistance of the underbody guard 100, help increase its strength, and contribute to lightweighting the underbody guard 100.

[0053] In some embodiments, the metal layer 2 includes a steel plate. The steel plate has high strength and hardness, enabling the bottom guard plate 100 to effectively withstand the pressure generated inside the battery pack 200 and the impact of the external environment, thereby ensuring the stability and safety of the bottom guard plate 100. Furthermore, compared to metal plates made of other materials, the steel plate has a lower manufacturing cost and a higher cost-performance ratio.

[0054] For example, the steel plate may be of type DP780 or DP590. Both DP780 and DP590 are high-strength dual-phase steels with excellent mechanical properties and impact resistance, as well as good ductility and formability.

[0055] In some embodiments, the thermal insulation layer 3 includes a mica board. The main component of the mica board is silicate minerals, which has a very low thermal conductivity and excellent thermal insulation performance. The structure of the mica board has many spaced air pockets, which can block heat conduction and play a role in reflecting heat, further enhancing its thermal insulation effect, so that the mica board can still maintain good thermal insulation performance in a high temperature environment, thereby reducing the impact of high-temperature and high-pressure gas on the bottom guard plate 100 when the battery cell 210 in the battery pack 200 thermal runaway. At the same time, the mica board also has high high-temperature resistance. When the battery cell 210 in the battery pack 200 thermal runaway occurs, the mica board will not deform or melt, ensuring the stability of its thermal insulation performance.

[0056] In some embodiments, as Figure 1 and Figure 4 As shown, the bottom guard plate 100 is provided with a clearance hole 110 that penetrates the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3. The clearance hole on the bottom guard plate 100 can make way for the mounting components of the battery pack 200, allowing the mounting components to pass through the clearance hole 110 and then connect to the frame of the battery pack 200, thereby mounting the battery pack 200 and improving the connection stability of the battery pack 200.

[0057] Furthermore, the clearance holes 110 include a first clearance hole 11 formed on the anti-corrosion layer 1, a second clearance hole 21 formed on the metal layer 2, and a third clearance hole 31 formed on the thermal insulation layer 3. That is, the anti-corrosion layer 1, the metal layer 2, and the thermal insulation layer 3 are respectively provided with a group of first clearance holes 11, second clearance holes 21, and third clearance holes 31, with each group of first clearance holes 11, second clearance holes 21, and third clearance holes 31 positioned correspondingly to form a through-hole structure of the clearance holes 110.

[0058] For example, Figure 1-4 As shown, the first clearance hole 11, the second clearance hole 21 and the third clearance hole 31 are all circular hole structures. Each group of corresponding first clearance holes 11, second clearance holes 21 and third clearance holes 31 are coaxially arranged. After the anti-corrosion layer 1, the metal layer 2 and the thermal insulation layer 3 are stacked and fitted, a clearance hole 110 with a through hole structure is formed.

[0059] It is understood that the first clearance holes 11, the second clearance holes 21, and the third clearance holes 31 may also be shaped like squares or triangles, depending on the application scenario. Furthermore, the same set of first clearance holes 11, second clearance holes 21, and third clearance holes 31 may also be shaped differently, as long as they can form the clearance holes 110 of the through-hole structure.

[0060] In some embodiments, the circumferential edge of the first evacuation hole 11 and the circumferential edge of the third evacuation hole 31 are connected to each other so as to enclose the metal layer 2 between the anti-corrosion layer 1 and the thermal insulation layer 3 .

[0061] Exemplarily, when the first evacuation hole 11, the second evacuation hole 21 and the third evacuation hole 31 are all circular holes, each group of the first evacuation hole 11, the second evacuation hole 21 and the third evacuation hole 31 can be coaxially arranged, and the diameter of the second evacuation hole 21 is larger than the diameters of the first evacuation hole 11 and the third evacuation hole 31, so that when the anti-corrosion layer 1, the metal layer 2 and the thermal insulation layer 3 are stacked, the circumferential edge of the first evacuation hole 11 and the circumferential edge of the third evacuation hole 31 can be in direct contact, and then fit and connect, so as to completely cover the metal layer 2 between the anti-corrosion layer 1 and the thermal insulation layer 3, thereby preventing the metal layer 2 from being exposed to the outside from the inner wall of the evacuation hole 110, and reducing the risk of corrosion and rust of the metal layer 2.

[0062] For example, Figure 2 As shown, when the metal layer 2 is stacked on the anti-corrosion layer 1 to form a composite structure, each second clearance hole 21 is coaxially arranged with the first clearance hole 11, and the diameter of the second clearance hole 21 is larger than the diameter of the first clearance hole 11. There is an area of the anti-corrosion layer 1 at the second clearance hole 21 that is not covered by the metal layer 2. Figure 3 As shown, the diameter of the second relief hole 21 is also larger than the diameter of the third relief hole 31. When the thermal insulation layer 3 is stacked on the composite structure formed by the anti-corrosion layer 1 and the metal layer 2, the area of the anti-corrosion layer 1 not covered by the metal layer 2 at the second relief hole 21 is directly bonded and connected to the thermal insulation layer 3, so that the metal layer 2 is completely covered between the anti-corrosion layer 1 and the thermal insulation layer 3, avoiding direct contact between the metal layer 2 and the outside world, reducing or avoiding the risk of corrosion and rust of the metal layer 2, and extending the service life of the bottom guard plate 100.

[0063] It should be noted that the first paving holes 11 , the second paving holes 21 and the third paving holes 31 are arranged in groups, and can be one group or multiple groups. Those skilled in the art can arrange them according to actual needs.

[0064] To facilitate the description of the technical solution of the present application, the preparation process of the midsole guard plate 100 of the present application is exemplarily described as follows:

[0065] First, lay the anti-corrosion layer 1 on the jig and apply a layer of glue on one side of the anti-corrosion layer 1; clean the surface of the metal layer 2, and then stack the cleaned metal layer 2 on the anti-corrosion layer 1 so that the side of the anti-corrosion layer 1 coated with glue is in contact with the metal layer 2; lay the thermal insulation layer 3 flat on the jig and apply a layer of glue on one side; stack the thermal insulation layer 3 on the metal layer 2 so that the side coated with glue is in contact with the metal layer 2; transfer the stacked anti-corrosion layer 1, metal layer 2 and thermal insulation layer 3 to a rolling device, perform heating and rolling treatment, and let it cool to obtain the bottom guard plate 100.

[0066] The bottom guard plate 100 provided in the embodiment of the present application adopts a method in which the metal layer 2 is sandwiched between the anti-corrosion layer 1 and the thermal insulation layer 3. There is no need to adopt preparation processes such as electrophoresis and powder spraying, thereby simplifying the preparation process of the bottom guard plate 100, reducing production costs, and improving the production efficiency of the bottom guard plate 100, that is, the product yield, and has strong feasibility.

[0067] It is understandable that the preparation process of the bottom guard plate 100 provided in this embodiment is merely an illustrative description and is not intended to limit the scope of protection of this application.

[0068] In a second aspect, an embodiment of the present application provides a battery pack 200 including the bottom guard plate 100 as described above.

[0069] like Figure 7 As shown, the bottom guard plate 100 is disposed at the bottom of the battery pack 200 to provide protection for the battery pack 200, enhance its overall structural strength, reduce the impact of external bumps and scratches on the battery cells 210 within the battery pack 200, and effectively reduce the impact of high-temperature, high-pressure gases on the battery cells 210 during thermal runaway. The bottom guard plate 100 is disposed at the bottom of the battery pack 200, with the side with the anti-corrosion layer 1 facing the outside of the battery pack 200 and the side with the thermal insulation layer 3 facing the inside of the battery pack 200. The anti-corrosion layer 1 has high corrosion resistance and helps to strengthen the bottom guard plate 100, reducing the risk of corrosion and rust. The thermal insulation layer 3 has strong thermal insulation properties. When the battery cells 210 within the battery pack 200 experience thermal runaway, the thermal insulation layer 3 can effectively block the impact of high-temperature, high-pressure gases, reducing the impact of thermal runaway on the bottom guard plate 100.

[0070] It is understandable that the battery cells 210 in the battery pack 200 can be cylindrical battery cells or square battery cells.

[0071] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A bottom guard plate, applied to a battery pack, characterized in that: Including anti-corrosion layer, metal layer and thermal insulation layer; The anti-corrosion layer and the heat-insulating layer are respectively attached to opposite sides of the metal layer; The metal layer is coated between the anti-corrosion layer and the heat insulation layer; The heat insulation layer is used to be arranged toward the battery cells in the battery pack; The edge of the anti-corrosion layer is circumferentially connected to the edge of the thermal insulation layer so that the metal layer is wrapped between the anti-corrosion layer and the thermal insulation layer.

2. The bottom guard plate according to claim 1, characterized in that The anti-corrosion layer, the metal layer and the heat insulation layer are connected by hot pressing.

3. The bottom guard plate according to claim 1, characterized in that Also comprising a first adhesive layer and a second adhesive layer; The first adhesive layer is provided between the anti-corrosion layer and the metal layer; The second adhesive layer is disposed between the metal layer and the heat insulation layer.

4. The bottom guard plate according to claim 1, characterized in that A plurality of connection holes penetrating the anti-corrosion layer and the heat insulation layer are provided on the circumferential direction of the edge of the bottom guard plate.

5. The bottom guard plate according to any one of claims 1 to 4, characterized in that: The anti-corrosion layer includes a glass fiber reinforced polypropylene plate; and / or, the metal layer comprises a steel plate; And / or, the thermal insulation layer includes a mica board.

6. The bottom guard plate according to any one of claims 1 to 4, characterized in that: The bottom guard plate is provided with a clearance hole that passes through the anti-corrosion layer, the metal layer and the heat insulation layer.

7. The bottom guard plate according to claim 6, characterized in that: The relief holes include a first relief hole opened on the anti-corrosion layer, a second relief hole opened on the metal layer, and a third relief hole opened on the heat insulation layer.

8. The bottom guard plate according to claim 7, characterized in that: The circumferential edge of the first evacuation hole and the circumferential edge of the third evacuation hole are connected to each other so as to wrap the metal layer between the anti-corrosion layer and the heat insulation layer.

9. A battery pack, characterized in that: Comprising the bottom guard plate as described in any one of claims 1-8.

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