Bottom plate, battery pack and electric device

Abstract

The utility model provides a base plate, battery pack and electricity utilization device, the base plate is used for being connected with the upper box body of battery pack, battery pack can be replaced through the battery changing equipment, the battery changing equipment and the battery pack generate relative displacement along the first direction, and one side of the base plate back to the upper box body is provided with a convex rib and a plane part. The convex ribs comprise first convex ribs used for making contact with the battery replacing equipment, the first convex ribs extend in the first direction, and the Z-direction height of the first convex ribs in the first direction is not changed or gradually changed. The Z-direction position of the force bearing point of the battery replacing equipment and the bottom plate does not change suddenly in the process that the battery replacing equipment moves relative to the bottom plate, the problem of stress concentration caused by sudden change of the Z-direction position of the force bearing point of the battery replacing equipment and the bottom plate can be avoided, and therefore the abrasion risk of the bottom plate is reduced. And meanwhile, the problem of abnormal sound caused by sudden change of the Z-direction position of a stress point between the battery replacement equipment and the bottom plate can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical device technology, specifically providing a base plate, a battery pack, and an electrical device. Background Technology

[0002] New energy vehicles have shown a rapid development trend in recent years due to their sustainable development and environmental friendliness. However, their insufficient range compared to gasoline vehicles is one of the most important reasons restricting their development.

[0003] With the rapid development of new energy sources, energy replenishment systems have become an unavoidable issue. Currently, there are two main ways to replenish pure electric vehicles in China: one is the more common method of building charging piles, and the other is the deployment of battery swapping stations. On the one hand, battery swapping offers a significant advantage in energy replenishment efficiency compared to charging piles. On the other hand, due to the unified management of battery swapping stations, all users no longer need to worry about battery degradation and safety issues, as battery checks can be performed every time a battery is swapped to ensure vehicle safety.

[0004] However, the battery packs circulating in the battery swapping station have exposed metal plates on their bottom plates, which pose a risk of corrosion. Utility Model Content

[0005] To address the issue of exposed metal plates on the bottom plate of a battery pack, this invention provides a bottom plate for connecting to the upper housing of the battery pack. The battery pack can be replaced by a battery swapping device, which moves relative to the battery pack along a first direction. The bottom plate has a raised rib and a flat surface on its side facing away from the upper housing. The raised rib includes a first raised rib for contacting the battery swapping device. The first raised rib extends along the first direction, and its Z-direction height remains constant or gradually changes along the first direction.

[0006] By setting the first rib, which contacts the battery swapping equipment, to have a constant or gradually varying height along the Z-direction, the Z-direction position of the stress points on both the battery swapping equipment and the base plate will not change abruptly during relative movement. This avoids stress concentration caused by sudden changes in the Z-direction position of the stress points between the battery swapping equipment and the base plate, thereby reducing the risk of base plate wear. It also prevents abnormal noise caused by sudden changes in the Z-direction position of the stress points between the battery swapping equipment and the base plate.

[0007] In an optional embodiment of this invention, the first rib includes a continuous support portion extending continuously along a first direction, the size of which is equal to the size of the base plate. Optionally, the first rib may also include an intermittent support portion extending along the first direction.

[0008] The raised ribs on the base plate are generally formed by stamping. It is easier to ensure that the Z-axis height of the first raised rib does not change abruptly by setting continuous support sections with the same dimensions as the base plate, especially when preparing continuous support sections with the same Z-axis height. In addition to the continuous support sections that can support the battery swapping equipment, the first raised rib also includes intermittent support sections, which can further reduce the risk of wear.

[0009] In an optional technical solution of this utility model, the aforementioned first rib includes a first row of intermittent support portions and a second row of intermittent support portions extending discontinuously along a first direction. A planar portion disposed within the first intermittent support portion is the first planar portion, and a planar portion disposed within the second intermittent support portion is the second planar portion. Along the second direction, the ribs of the first planar portion and the second row of intermittent support portions overlap, and the Z-direction heights of the first and second rows of intermittent support portions are the same. When the power swapping equipment moves to the end of a rib of the first row of intermittent support portions, it can safely transition to being supported by the ribs of the second row of support portions; similarly, when the power swapping equipment moves to the end of a rib of the second row of support portions, it can safely transition to being supported by the ribs of the first row of support portions. This also ensures that the Z-direction position of the stress points between the power swapping equipment and the base plate does not change abruptly, avoiding stress concentration problems caused by abrupt changes in the Z-direction position of the stress points between the power swapping equipment and the base plate, thereby reducing the risk of base plate wear.

[0010] In an optional technical solution of this utility model, the aforementioned first rib includes two continuous support portions extending along a first direction, and a planar portion extending continuously along the first direction is provided between the two continuous support portions extending along the first direction. The two continuous support portions extending along the first direction can support the power swapping equipment, and the continuously extending planar portion between the two continuous support portions avoids the structure of the power swapping equipment, while also improving the rigidity of the base plate.

[0011] In an optional technical solution of this utility model, the planar portion that extends continuously along the first direction is surrounded by the first rib.

[0012] In an optional technical solution of this utility model, the length L1 of the first rib along the second direction satisfies: L1≥280mm. Setting L1 within the above-mentioned value range can increase the contact area between the base plate and the power swapping equipment during movement, further reducing the risk of wear on the base plate.

[0013] In the optional technical solution of this utility model, along the second direction, the length of the first rib is greater than or equal to 50% of the length of the power swapping equipment, ensuring that the base plate and the power swapping equipment have sufficient contact area when moving relative to each other, and further reducing the risk of wear on the base plate.

[0014] In an optional embodiment of this invention, the aforementioned rib further includes a second rib that is not used for contacting the battery swapping equipment. The addition of the second rib increases the rigidity of the base plate and provides greater resistance to external impacts.

[0015] In an optional technical solution of this utility model, the side of the base plate facing away from the upper housing is provided with a coating. The material of the 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, and PVC solvent-based coating, which can improve the wear resistance of the base plate.

[0016] This utility model also provides a battery pack, including an upper housing, a battery cell, and the aforementioned base plate.

[0017] This utility model also provides an electrical device, including the aforementioned battery pack. Attached Figure Description

[0018] Figure 1 This is a top view of the battery pack;

[0019] Figure 2 A schematic diagram of one embodiment of the base plate;

[0020] Figure 3 This is a schematic diagram of another embodiment of the base plate;

[0021] Figure Labels

[0022] Base plate 100;

[0023] convex rib 110;

[0024] First protruding rib 111;

[0025] Continuous support section 1111, discontinuous support section 1112;

[0026] First column intermittent support 1113, second column intermittent support 1114;

[0027] Second rib 112;

[0028] Planar part 120;

[0029] First planar part 121, second planar part 122. Detailed Implementation

[0030] The following describes optional embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] In the description of this utility model, it should be understood that the terms "distance", "width", "thickness", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly defined.

[0033] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In recent years, the new energy vehicle market has shown a rapid growth trend. With the rapid development of new energy, the energy replenishment system has become an unavoidable issue. Currently, there are two main ways to replenish energy for pure electric vehicles in China: one is the more common method of building charging piles, and the other is the deployment of battery swapping stations. On the one hand, battery swapping undoubtedly has an advantage in energy replenishment efficiency; on the other hand, due to the unified management of battery swapping stations, all users no longer need to worry about battery degradation and safety issues, and can receive a battery check-up every time they swap batteries.

[0035] During charging, the battery pack bottom protector achieves its mechanical properties solely through rib design and corrosion resistance through a spray coating. However, during battery swapping, the battery pack is transported via chains or rollers, inevitably causing the bottom protector to come into contact with these components, resulting in friction. Chains and rollers are typically located in four compartments: the connection point, buffer area, lifting point, and battery compartment. As the battery pack moves from one compartment to another, sliding friction occurs between the chain, rollers, and the bottom protector. The rib design at the bottom of the bottom protector causes excessive pressure in some areas. With repeated transfers, the coating thins in some areas, sometimes even exposing the metal base plate, increasing the risk of corrosion and further exposing the metal. Given the relatively high maintenance costs of battery packs and the negative impact of repairs on user experience, there is an urgent need to improve the wear resistance of the battery pack bottom protector.

[0036] To address the issue of exposed metal plates on the base plate of the battery pack, such as Figure 1 As shown, this utility model provides a base plate 100 and a battery pack. The base plate 100 is used to connect to the upper housing of the battery pack. The battery pack can be replaced by a battery swapping device. The battery swapping device (e.g., rollers and chains) moves relative to the battery pack along a first direction. The side of the base plate 100 facing away from the housing is provided with a rib 110 and a flat surface 120. The rib 110 includes a first rib 111 for contacting the battery swapping device. The first rib 111 extends along the first direction, and its height in the Z-direction (i.e., the direction perpendicular to the base plate) remains constant or gradually changes. By setting the height of the first rib 111 for contacting the battery swapping device to remain constant or gradually change along the first direction Z-direction, the Z-direction position of the stress point between the battery swapping device and the base plate will not change abruptly during the relative movement of the battery swapping device and the base plate 100. This avoids stress concentration problems caused by abrupt changes in the Z-direction position of the stress point between the battery swapping device and the base plate, thereby reducing the risk of wear on the base plate 100. This also avoids abnormal noise problems caused by sudden changes in the Z-axis position of the stress point between the power swapping equipment and the base plate 100.

[0037] In optional embodiments of this utility model, such as Figure 1 As shown, the first rib 111 includes a continuous support portion 1111 extending continuously along a first direction, the size of which is equal to the size of the bottom of the base plate 100. Ribs on the base plate 100 are generally formed by stamping. By providing a continuous support portion 1111 with the same size as the bottom of the base plate 100, it is easier to ensure that the height of the first rib 111 in the Z-direction does not change abruptly. In particular, fabricating a continuous support portion with the same Z-direction height simplifies the manufacturing process.

[0038] Optionally, the first rib 111 may also include an intermittent support portion 1112 extending along the first direction. In addition to the continuous support portion 1111 serving to support the power swapping equipment, the intermittent support portion 1112 can also serve to support the power swapping equipment. This further increases the contact area between the first rib and the power swapping equipment, which can further reduce the risk of wear and increase the rigidity of the base plate.

[0039] In optional embodiments of this utility model, such as Figure 1 As shown, the first rib 111 includes two continuous support portions 1111 extending along a first direction, and a planar portion 120 extending continuously along the first direction is disposed between the two continuous support portions 1111. The two continuous support portions 1111 extending along the first direction can support the power swapping equipment, and the planar portion 120 extending continuously between the two continuous support portions 1111 avoids obstructing the structure of the power swapping equipment, while also improving the rigidity of the base plate 100. Optionally, the planar portion extending continuously along the first direction can be surrounded by the first rib 111.

[0040] In optional embodiments of this utility model, such as Figure 1 As shown, the rib 110 also includes a second rib 112 that is not used for contact with the battery swapping equipment. The second rib 112 increases the overall rigidity of the base plate 100, provides greater resistance to external impacts, and better ensures the safety of the battery pack.

[0041] In optional embodiments of this utility model, such as Figure 2 As shown, the first protruding rib of the base plate does not include, for example... Figure 1 The continuous support portion extending along the first direction shown includes a first rib 111 comprising a first row of intermittent support portions 1113 and a second row of intermittent support portions 1114 extending discontinuously along the first direction. A planar portion within the first row of intermittent support portions is a first planar portion 121, and a planar portion within the second row of intermittent support portions is a second planar portion 122. Along the second direction, the first planar portion 121 overlaps with the ribs in the second row of intermittent support portions, and the second planar portion 122 overlaps with the ribs in the first row of intermittent support portions. The Z-direction height of the first and second rows of intermittent support portions is the same. When the power swapping equipment moves to the end of a rib in the first row of intermittent support portions, it can safely transition to being supported by the ribs in the second row of support portions; similarly, when the power swapping equipment moves to the end of a rib in the second row of support portions, it can safely transition to being supported by the ribs in the first row of support portions. Similarly, this ensures that the Z-axis position of the stress points between the battery swapping equipment and the base plate does not change abruptly, avoiding stress concentration problems caused by sudden changes in the Z-axis position of the stress points between the battery swapping equipment and the base plate, thereby reducing the risk of base plate wear. Figure 2 and Figure 3As shown, the width of each rib in the first column of intermittent support 1113 and the second column of intermittent support 1114 can be the same or different, and can be modified according to actual needs.

[0042] In optional embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the length L1 of the first rib 111 along the second direction satisfies: L1 ≥ 280 mm. Setting L1 within the above value range increases the contact area between the base plate and the power swapping equipment during movement, further reducing the risk of base plate wear. Optionally, along the second direction, the length of the first rib is greater than or equal to 50% of the length of the power swapping equipment, ensuring sufficient contact area between the base plate and the power swapping equipment during relative movement, further reducing the risk of base plate wear. During the relative movement of the base plate and the power swapping equipment, the dimension in contact with the power swapping equipment (e.g., rollers) changes, that is, the dimension of the first rib 111 along the first direction changes. Therefore, it is understood that the minimum dimension of the first rib along the first direction is greater than or equal to 280 mm. It is understood that the minimum dimension of the first rib along the first direction is greater than or equal to 50% of the length of the power swapping equipment.

[0043] In an optional embodiment of this utility model, the side of the base plate 100 facing away from the housing is provided with a coating material 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, and PVC solvent-based coating, which can improve the wear resistance of the base plate 100.

[0044] This utility model also provides an electrical device. The electrical device of this utility model includes a battery pack in an optional embodiment. This electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0045] The technical solution of this utility model has been described in conjunction with the optional embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A bottom plate for connection with an upper case of a battery pack, the battery pack being replaced by a battery replacing device, the battery replacing device being relatively displaced along a first direction and the battery pack, characterized in that, The one side of the bottom plate facing away from the upper box is provided with a convex rib and a flat part, the convex rib includes a first convex rib for contacting the battery swapping device, the first convex rib extends along a first direction, and the Z-direction height of the first convex rib along the first direction is constant or gradually changes.

2. The base plate of claim 1, wherein The first convex rib includes a continuous support part continuously extending along the first direction, and the size of the continuous support part along the first direction is equal to the size of the bottom plate.

3. The base plate of claim 1, wherein The first convex rib includes a first column of intermittent support parts and a second column of intermittent support parts intermittently extending along the first direction, the flat part provided in the first column of intermittent support parts is a first flat part, the flat part provided in the second column of intermittent support parts is a second flat part, along a second direction, the convex rib of the first flat part and the second column of intermittent support parts overlap, the convex rib of the second flat part and the first column of intermittent support parts overlap, and the Z-direction height of the first column of intermittent support parts is the same as the Z-direction height of the second column of intermittent support parts.

4. The base plate of claim 2, wherein, The first convex rib further includes an intermittent support part extending along the first direction.

5. The base plate of claim 2, wherein, The first convex rib includes two continuous support parts extending along the first direction, and a flat part continuously extending along the first direction is arranged between the two continuous support parts extending along the first direction.

6. The base plate of claim 5, wherein, The flat part continuously extending along the first direction is surrounded by the first convex rib.

7. The base plate of claim 2 or 3, wherein The length L1 of the first convex rib along the second direction satisfies: L1≥280mm.

8. The base plate of claim 7, wherein, Along the second direction, the length of the first convex rib is greater than or equal to 50% of the length of the battery swapping device.

9. The baseplate of claim 1, wherein, The convex rib further includes a second convex rib not used for contacting the battery swapping device.

10. The baseplate of claim 1, wherein, The one side of the bottom plate facing away from the upper box is provided with a coating, and the material of the coating is selected from any one of polyamide powder coating, polyester powder coating, epoxy powder coating, solvent type coating of epoxy, solvent type coating of polyurea, solvent type coating of acrylic, solvent-free type coating of epoxy, solvent-free type coating of polyurea, solvent-free type coating of acrylic, and PVC solvent type coating.

11. A battery pack, characterized by, The battery pack includes an upper box, a battery monomer, and the bottom plate as claimed in any one of claims 1 to 10.

12. An electrical device, characterized by The battery pack includes the battery pack as claimed in claim 11. The battery pack includes the battery pack as claimed in claim 11.

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