Bottom plate, battery pack and electric device

Abstract

The utility model provides a bottom plate, a battery pack and a power utilization device, the bottom plate is used for being connected with an upper box body of the battery pack, the battery pack can be quickly replaced through battery replacement equipment, the bottom plate comprises a first area and a second area, and the first area is used for being in contact with the battery replacement equipment; a first coating is arranged on the first area, and a second coating is arranged on the second area; and the wear resistance of the first coating is greater than that of the second coating. The wear resistance of the first coating of the first area in contact with the battery replacing equipment is greater than that of the second coating of the second area, so that the bottom plate can be prevented from being worn out of the metal plate, the corrosion of the bottom plate is avoided, the long service life of the battery pack can be ensured, and the battery pack can be supported to perform high-frequency battery replacing circulation.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical devices, and specifically provides a bottom plate, a battery pack and an electrical device. Background Art

[0002] Due to the characteristics of sustainable development and environmental friendliness of new energy vehicles, they have shown a rapid development trend in recent years. However, compared with fuel vehicles, the current situation of insufficient endurance is one of the most important reasons restricting their development.

[0003] With the rapid development of new energy, the energy replenishment system has become an inevitable issue. At present, there are two ways to replenish energy for pure electric vehicles in China. One is to build charging piles, which is relatively common, and the other is to layout battery swap stations. On the one hand, the advantage of battery swapping in terms of energy replenishment efficiency is far greater than that of charging piles. On the other hand, due to the unified management of battery swap stations, all users no longer need to worry about battery attenuation and safety issues. A battery inspection can be carried out during each battery swap to ensure the safety of the vehicle being driven.

[0004] However, there is a problem that the metal plate of the bottom plate of the battery pack flowing in the battery swap station is exposed, and there is a risk of corrosion. Summary of the Utility Model

[0005] In order to solve the problem of the exposed metal plate on the bottom plate of the battery pack, the utility model provides a bottom plate, which is used to connect with the upper box body of the battery pack. The battery pack can be replaced by a battery swapping device. The bottom plate includes a first area and a second area. The first area is used to contact with the battery swapping device; a first coating is provided on the first area, and a second coating is provided on the second area; the wear resistance of the first coating is greater than that of the second coating. Making the wear resistance of the first coating in the first area contacting the battery swapping device greater than that of the second coating in the second area can prevent the bottom plate from being worn and leaking the metal plate, thereby avoiding the corrosion of the bottom plate, further ensuring the long life of the battery pack, and supporting the high-frequency battery swapping of the battery pack.

[0006] In an alternative technical solution of the utility model, the materials of the first coating and the second coating are different; the material of the first coating is selected from at least one of polyamide powder coating, polyester powder coating, epoxy powder coating, epoxy solvent-based coating, polyurea solvent-based coating, acrylic solvent-based coating, epoxy solvent-free coating, polyurea solvent-free coating, acrylic solvent-free coating; the material of the second coating is selected from at least one of polyamide powder coating, polyester powder coating, epoxy powder coating, epoxy solvent-based coating, polyurea solvent-based coating, acrylic solvent-based coating, epoxy solvent-free coating, polyurea solvent-free coating, acrylic solvent-free coating, PVC solvent-based coating.

[0007] In an alternative technical solution of the present utility model, the bottom plate further includes a third region, a third coating is provided on the third region, and the material of the third coating is different from the materials of the first coating and the second coating; the material of the third coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, and PVC solvent-based coatings.

[0008] In an alternative technical solution of the present utility model, the thickness of the first coating is greater than the thickness of the second coating.

[0009] In an alternative technical solution of the present utility model, the materials of the first coating and the second coating are the same or different.

[0010] In an alternative technical solution of the present utility model, the material of the first coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, and solvent-free acrylic coatings; the material of the second coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, and PVC solvent-based coatings.

[0011] In an alternative technical solution of the present utility model, the first region includes a first sub-region and a second sub-region, the center line of the first sub-region coincides with the center line of the bottom plate, and the distance L1 from the boundary of the first sub-region to the center line and the distance L2 from the boundary of the bottom plate to the center line satisfy: 0.1 ≤ L1 / L2 ≤ 0.5;

[0012] The distance L3 from the second sub-region to the center line satisfies: 600 mm ≤ L3 ≤ 650 mm, and the width D1 of the second sub-region satisfies: 30 mm ≤ D1 ≤ 45 mm.

[0013] In an alternative technical solution of the present utility model, the outer surface of the bottom plate is provided with a protrusion, the first region includes a protrusion region and a recessed region, and the thickness of the first coating in the protrusion region is greater than the thickness of the first coating in the recessed region.

[0014] In an alternative technical solution of the present utility model, the thickness of the first coating at the edge of the protrusion region is greater than the thickness of the first coating at the middle of the protrusion region.

[0015] The present utility model further provides a battery pack, including the above-mentioned bottom plate.

[0016] The present utility model further provides an electrical device, including the above-mentioned battery pack. Description of the Drawings

[0017] Figure 1 It is an exploded view of the battery pack;

[0018] Figure 2 It is a schematic diagram of an embodiment of the bottom plate;

[0019] Figure 3 It is a schematic diagram of another embodiment of the bottom plate.

[0020] Reference Signs

[0021] Upper box body 100;

[0022] Bottom plate 200;

[0023] First region 210, second region 220, protrusion 230;

[0024] Battery cell 300. Detailed Embodiments

[0025] The optional embodiments of the present utility model will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "distance", "width", "thickness", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0027] In the description of the present utility model, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0028] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] As Figure 1 shown, the battery pack includes an upper box body 100, a bottom plate 200, and battery cells 300. The upper box body 100 and the bottom plate 200 enclose an accommodation cavity, and the battery cells 300 are arranged in the accommodation cavity. After being connected in series and parallel in the accommodation cavity, the total positive and negative electrodes are led out from the battery pack, so as to be electrically connected to the electrical device. In the actual application scenario, the electrical device including the battery pack is mainly impacted on the bottom and side. The bottom plate 200 plays a main protective role for the battery cells 300 in the battery pack, and the quality of the bottom plate 200 has a great impact on the safety of the battery pack. In order to quickly replenish energy, through a battery swapping device, a battery pack with sufficient power can be used to quickly replace the battery pack with depleted power. However, during the battery swapping process, the battery swapping device will contact the bottom plate of the battery pack, and thus there will be friction on the bottom plate 200 of the battery pack. The traditional bottom plate is composed of a metal plate, an electrophoretic paint coated on both sides of the metal plate, and a coating coated on one side of the electrophoretic paint. The coating is composed of micro-foamed PVC. The coating has low hardness, high surface roughness, and poor wear resistance. If the bottom plate 200 is worn and the metal plate is exposed, the bottom plate is easily corroded, affecting the safety of the battery pack, and then the battery pack cannot support multiple battery swaps.

[0030] To solve the problem that the metal plate of the bottom plate 200 is exposed, as Figure 2 shown, the present utility model provides a bottom plate 200. The bottom plate 200 includes a first region 210 and a second region 220. The first region 210 is used to contact the above-mentioned battery swapping device; a first coating is provided on the first region 210, and a second coating is provided on the second region 220; the wear resistance of the first coating is greater than that of the second coating. Making the wear resistance of the first coating on the first region 210 in contact with the battery swapping device greater than that of the second coating on the second region 220 can prevent the bottom plate 200 from being worn and the metal plate from being exposed, thereby avoiding the corrosion of the bottom plate 200, and further ensuring the long life of the battery pack and supporting the high-frequency battery swapping and turnover of the battery pack. The first region can be a continuous region in contact with the battery swapping device as Figure 2 shown, or an intermittent region in contact with the battery swapping device as Figure 3 shown.

[0031] In an alternative embodiment of the present utility model, the materials of the first coating and the second coating are different. The material of the first coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings; the material of the second coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, PVC (Polyvinyl chloride) solvent-based coatings. The wear resistance of the material of the first coating is better than that of the material of the second coating. Making the first coating and the second coating materials with different wear resistances can not only meet the different wear resistance requirements of different regions on the bottom plate 200, but also select and set inexpensive materials in areas where strong wear resistance is not required to save costs. In this embodiment, two material layer coatings are provided on the bottom plate. In another embodiment of the present utility model, the bottom plate further includes a third region, and a third coating is provided on the third region. The material of the third coating is different from both the material of the first coating and the material of the second coating. The optional range of the material of the third coating is the same as the optional range of the material of the second coating, which will not be elaborated here. Of course, it can be understood that three or more different coating materials can also be provided on the bottom plate 200, and the present application does not make any restrictions.

[0032] In an alternative embodiment of the present utility model, the thickness of the first coating is greater than that of the second coating. The selection ranges of the materials of the first coating and the second coating are the same as those in the above embodiment, which will not be elaborated here. For example, the materials of the first coating and the second coating can be set to be the same, and by controlling the larger thickness of the first coating, the wear resistance requirements of the first region in contact with the battery swapping device can be met, preventing the problem of wear and metal leakage in the first region. For the second region that is not in contact with the battery swapping device, the thickness of the second coating can be controlled to be smaller, saving costs while meeting the smaller wear resistance requirements of the second region. Of course, the materials of the first coating and the second coating can also be set to be different, and the thicknesses of different materials can also be different. Moreover, two or more coating materials and two or more coating thicknesses can be combined, and the present application does not make any restrictions, all within the protection scope of the present application.

[0033] In an alternative embodiment of the present utility model, as Figure 3As shown, the first region 210 includes a first sub-region 211 and a second sub-region 212. The center line of the first sub-region 211 coincides with the center line of the bottom plate. The distance L1 from the boundary of the first sub-region 211 to the center line and the distance L2 from the boundary of the bottom plate to the above center line satisfy: 0.1 ≤ L1 / L2 ≤ 0.5. If the value of L1 / L2 is too small or too large, the contact area between the battery swapping device and the bottom plate 200 is too small or too large, which is not conducive to the stability of the battery swapping process. If the value of L1 / L2 is too small, the pressure per unit area of the bottom plate is too large, and local damage is likely to occur. If the value of L1 / L2 is too large, the area to be rubbed is larger, and a coating material with a greater wear resistance is required, resulting in higher costs. Setting L1 and L2 within the above range can balance the battery swapping stability, safety, and cost control. The distance L3 from the second sub-region 212 to the center line satisfies: 600 mm ≤ L3 ≤ 650 mm, and the width D1 of the second sub-region satisfies: 30 mm ≤ D1 ≤ 45 mm. At the first sub-region 211, the rollers and chains of the battery swapping device are in contact with the bottom plate 200. At the second sub-region 212, the chains are in contact with the bottom plate 200. Of course, the first region can also be a continuous region as shown in Figure 2 where the rollers and chains of the battery swapping device are in contact with the bottom plate at the first region, or the battery swapping station can also be in contact with the bottom plate only through the rollers.

[0034] In an alternative embodiment of the present invention, as shown in Figure 3 the outer surface of the bottom plate 200 is provided with protrusions 230. The first region 210 includes a protrusion region and a recessed region, and the thickness of the first coating in the protrusion region is greater than the thickness of the first coating in the recessed region. The setting of the protrusions 230 can improve the rigidity of the bottom plate. When the first region 210 is provided with protrusions, there must be recessed regions. The first region 210 is in contact with the battery swapping device only through the protrusions 230. That is, the contact area between the bottom plate 200 and the battery swapping device becomes smaller, and the frictional force becomes larger. Therefore, the coating in the protrusion region has a higher wear resistance requirement. Setting the thickness of the first coating in the protrusion region to be greater than the thickness of the first coating in the recessed region can save costs while meeting the different wear resistance requirements of different regions. It can be understood that the positions of the protrusions 230 on the outer surface of the bottom plate 200 include but are not limited to the first region 210. The second region 220 can also be provided with protrusions 230, but since the second region 220 is not in contact with the battery swapping device, the wear resistance performance requirement is not high. A coating material with weak wear resistance can be set, or the coating thickness of the second region 220 can be set to be smaller. When the battery swapping device passes over the spaced protrusions 230, there will be relatively large stresses at the edge positions of the protrusions 230. Therefore, the thickness of the first coating at the edge of the protrusion region can be further set to be greater than the thickness of the first coating at the middle of the protrusion region.

[0035] The present invention also provides a battery pack, including the bottom plate 200 of the above alternative embodiment.

[0036] The present utility model also provides an electrical device. The electrical device of the present utility model includes a battery pack of an alternative embodiment. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0037] So far, the technical solutions of the present utility model have been described in conjunction with the alternative embodiments shown in the drawings. However, it is easily understood by those skilled in the art that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A bottom plate for connecting to the upper box body of a battery pack, the battery pack being replaceable by a battery swapping device, characterized in that the bottom plate includes a first area and a second area, and the first area is used for contacting the battery swapping device; a first coating is provided on the first area, and a second coating is provided on the second area; the wear resistance of the first coating is greater than that of the second coating.

2. The base plate according to claim 1, characterized in that, The materials of the first coating and the second coating are different; The material of the first coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, and solvent-free acrylic coatings; The material of the second coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, and PVC solvent-based coatings.

3. The base plate according to claim 2, characterized in that, The bottom plate further includes a third area, and a third coating is provided on the third area, and the material of the third coating is different from the materials of the first coating and the second coating; The material of the third coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, and PVC solvent-based coatings.

4. The base plate according to claim 1, characterized in that The thickness of the first coating is greater than that of the second coating.

5. The base plate according to claim 4, characterized in that, The materials of the first coating and the second coating are the same or different.

6. The base plate according to claim 5, characterized in that, The material of the first coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, and solvent-free acrylic coatings; The material of the second coating is selected from at least one of polyamide powder coatings, polyester powder coatings, epoxy powder coatings, solvent-based epoxy coatings, solvent-based polyurea coatings, solvent-based acrylic coatings, solvent-free epoxy coatings, solvent-free polyurea coatings, solvent-free acrylic coatings, and PVC solvent-based coatings.

7. The base plate according to claim 6, characterized in that, The first area includes a first sub-area and a second sub-area, the center line of the first sub-area coincides with the center line of the bottom plate, and the distance L1 from the boundary of the first sub-area to the center line and the distance L2 from the boundary of the bottom plate to the center line satisfy: 0.1 ≤ L1 / L2 ≤ 0.5; The distance L3 of the second sub-area from the center line satisfies: 600 mm ≤ L3 ≤ 650 mm, and the width D1 of the second sub-area satisfies: 30 mm ≤ D1 ≤ 45 mm.

8. The base plate according to claim 6, characterized in that, The first area includes a raised area and a recessed area, and the thickness of the first coating in the raised area is greater than the thickness of the first coating in the recessed area.

9. The base plate according to claim 6, wherein The thickness of the first coating at the edge of the raised area is greater than the thickness of the first coating at the middle of the raised area.

10. A battery pack, characterized in that, Comprising a bottom plate according to any one of claims 1 to 9.

11. An electrical device, characterized in that, Comprising a battery pack according to claim 10.

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