A composite water-cooled plate for a battery tray and the battery tray itself.

Abstract

This utility model discloses a composite water-cooled plate for a battery tray and the battery tray itself. The composite water-cooled plate includes: a water-cooled channel plate with a recessed water channel groove on one side; and a water-cooled cover plate, which is a composite plate formed by a first plate layer and a second plate layer. The cover plate covers the water-cooled channel plate, and the first plate layer and the water-cooled channel plate are connected by resist welding. A cooling water flow channel for heat exchange is formed between the water-cooled channel plate and the water-cooled cover plate. This utility model, by using a water-cooled plate composed of stainless steel plate and steel-aluminum composite plate, increases the overall structural strength, solves the problem of poor structural strength in existing all-aluminum liquid cooling plates, improves its load-bearing capacity and the protection level of the battery tray, and ensures the safe operation of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery tray cooling plate technology, specifically to a composite water-cooled plate for a battery tray and a battery tray. Background Technology

[0002] Currently, the cooling of battery packs in the battery trays of new energy electric vehicles is all done by liquid cooling, and aluminum liquid cooling plates are the industry's first choice. However, aluminum liquid cooling plates have low structural strength. Although they perform well in cooling effect, the integration of aluminum liquid cooling plates and steel protective plates is a connection of dissimilar materials, which has poor weldability, complex welding process (mostly brazing), few low-cost welding processes, and aluminum is prone to rapid oxidation and corrosion, and there is a risk of bending and deformation when bearing the weight of the battery. Utility Model Content

[0003] This utility model aims to solve the technical problems of low structural strength, poor corrosion resistance, and complex welding process of existing battery tray liquid cooling plates, and proposes a composite water cooling plate for battery trays with good weldability, corrosion resistance, high strength, and simple welding process.

[0004] A composite water-cooled plate for a battery tray includes: a water-cooled trough plate, one side of which is recessed to form a water channel groove; and a water-cooled cover plate, wherein the water-cooled cover plate is a composite plate formed by a first plate layer and a second plate layer, the water-cooled cover plate covers the water-cooled trough plate, and the first plate layer and the water-cooled trough plate are connected by a resist weld, and a cooling water flow channel for heat exchange is formed between the water-cooled trough plate and the water-cooled cover plate.

[0005] The water-cooled cover plate is a two-layer steel-aluminum composite plate. The first layer is a stainless steel plate, and the water-cooled trough plate is made of stainless steel. The first layer is welded to the water-cooled trough plate with water channel grooves to form a sealed cooling water flow channel.

[0006] Using the above technical solution, the weldable surfaces of the water-cooled trough plate and the water-cooled cover plate are made of the same metal and can be connected and fixed by resist welding or spot welding. The welding process is simple and the manufacturing cost is low. A cooling water flow channel is formed between the steel plate layers of the water-cooled trough plate and the water-cooled cover plate, which has good corrosion resistance, greatly improves the strength of the water-cooled plate, enhances the load-bearing capacity and impact resistance of the water-cooled plate, and is not easy to deform. Due to the low thermal resistance of the water-cooled trough plate, it also has a heat preservation effect on the battery pack in the battery tray.

[0007] Furthermore, the water channel groove is provided with multiple sets of parallel DC section grooves, and the ends of adjacent DC section grooves are connected by arc-shaped grooves. The DC section grooves and arc-shaped grooves form a continuous curved cooling water flow channel, improving heat exchange efficiency.

[0008] Preferably, the water-cooling groove on the water-cooling tank plate is integrally stamped, and the water-cooling cover plate is integrally stamped from a steel-aluminum composite plate. The water-cooling tank plate and the water-cooling cover plate are connected by spot welding or resistance welding.

[0009] Preferably, the second layer is an aluminum layer. The stainless steel layer of the first layer and the aluminum layer of the second layer are combined to form a steel-aluminum composite panel. By utilizing existing steel-aluminum composite panels, the manufacturing cost is greatly reduced.

[0010] Preferably, the thickness of the water-cooled tank plate is 0.6-1.5mm.

[0011] Preferably, the stainless steel layer of the first plate has a thickness of 0.2-0.4 mm, and the aluminum layer of the water-cooled cover plate has a thickness of 0.4-0.6 mm.

[0012] Preferably, the water-cooled cover plate, based on the aluminum plate layer, also includes one of the following structures: the second plate layer of the water-cooled cover plate is an aluminum plate layer, and the first plate layer is a copper plate layer or a titanium plate layer.

[0013] This utility model also provides a battery tray, including the composite water-cooled plate of the aforementioned battery tray. Furthermore, the battery pack on the battery tray is bonded to the second layer of the water-cooled cover for heat conduction.

[0014] The composite water-cooled plate and battery tray provided by this utility model have the following beneficial effects:

[0015] The stainless steel layers of the water-cooled trough and cover plate are highly weldable, allowing for integration using mature processes such as spot welding or resistance welding, thus reducing manufacturing costs. By placing the cooling channels between the stainless steel layers of the trough and cover plate, the problem of easy oxidation and corrosion of existing aluminum liquid cooling plates is effectively solved, while stainless steel generally exhibits superior corrosion resistance compared to aluminum.

[0016] The battery pack dissipates heat by being close to the aluminum plate of the water-cooled cover, and the heat is carried away through the cooling water channel, thus achieving a heat dissipation effect; the stainless steel plate on the outer side has low thermal resistance and also has a heat insulation effect.

[0017] The composite water-cooled plate provided by this utility model is a water-cooled plate composed of stainless steel plate and steel-aluminum composite plate, which increases the overall structural strength, solves the problem of poor structural strength of all-aluminum liquid-cooled plates in the prior art, improves its load-bearing capacity and the protection level of the battery tray, and enables the battery pack to operate safely. Attached Figure Description

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings:

[0019] Figure 1A cross-sectional structural diagram of a composite water-cooled plate for a battery tray provided by this utility model;

[0020] Figure 2 A three-dimensional structural diagram of a composite water-cooled plate for a battery tray provided by this utility model;

[0021] Figure 3 A schematic diagram of the weld seam of the water-cooling trough plate of the composite water-cooling plate of the battery tray provided by this utility model.

[0022] The following are the labels in the diagram: 2. Water-cooled cover plate; 201. First plate layer; 202. Second plate layer; 3. Water-cooled channel plate; 30. Water channel groove; 31. Direct current section groove; 32. Arc-shaped groove; 33. Cooling water flow channel; 4. Circular weld; 5. Weld point. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides a composite water-cooled plate for a battery tray, comprising: a water-cooled trough plate 3, such as... Figure 1 , Figure 2 , Figure 3 As shown, the water-cooled trough plate 3 is made of stainless steel. One side of the water-cooled trough plate 3 has a recessed water channel groove 30. The water channel groove 30 has multiple sets of parallel DC section grooves 31. The ends of adjacent DC section grooves 31 are connected by arc-shaped grooves 32. Multiple parallel DC section grooves 31 and arc-shaped grooves 32 are punched onto the water-cooled trough plate 3 using a stamping die. The ends of adjacent DC section grooves 31 are connected by arc-shaped grooves 32 to form the cooling water flow channels 33 on the entire water-cooled trough plate 3. A water-cooled cover plate 2 is welded to the surface of the water-cooled trough plate 3. Figure 2 As shown, the water-cooled trough plate 3 and the water-cooled cover plate 2 are welded together by an annular weld 4. The cooling water flow channel 33 is located inside the annular weld 4. The annular weld 4 makes the water-cooled trough plate 3 and the water-cooled cover plate 2 form an annular seal, so that the cooling water in the water channel groove 30 will not flow out from between the water-cooled trough plate 3 and the water-cooled cover plate 2 to the outside of the cooling water plate.

[0025] like Figure 1 , Figure 2As shown, it also includes a water-cooled cover plate 2, which covers the bottom surface of the water-cooled trough plate 3 and is connected by resist welding. A cooling water flow channel 33 for heat exchange is formed between the water-cooled trough plate 3 and the water-cooled cover plate 2. In a preferred embodiment, the water-cooled cover plate 2 adopts a two-layer composite plate structure, which includes a first plate layer 201 and a second plate layer 202. The second plate layer 201 is connected to the water-cooled trough plate 3 with water channel grooves by resist welding or spot welding, and a cooling water flow channel 33 is provided between the two. Here, the water-cooled trough plate 3 may be provided with a water nozzle (not shown in the figure) for communicating with the cooling water flow channel.

[0026] Using the above scheme, firstly, the weldable surfaces of the first layer of the water-cooled trough plate 3 and the water-cooled cover plate 2 are made of the same metal, preferably stainless steel; the circumferential weld 4 can be fixed by roll welding, and spot welding is performed on the contact surface outside the water channel groove 30, such as... Figure 2 As shown, the water-cooled trough plate 3 has multiple welding points 5, which are connected to the water-cooled cover plate 2 through roll welding and spot welding processes. This simple welding process reduces manufacturing costs and solves the welding problem between aluminum liquid-cooled plates and rigid protective plates. A combination of spot welding and roll welding can be used for connection. Secondly, a cooling water channel 33 is formed between the first plate layer of the water-cooled trough plate 3 and the water-cooled cover plate 2. Preferably, the water-cooled trough plate 3 and the first plate layer 201 are made of stainless steel, which has good corrosion resistance and high strength, significantly improving the strength of the water-cooled plate, enhancing its load-bearing capacity and impact resistance, and making it less prone to deformation. Thirdly, because the water-cooled trough plate 3 is made of stainless steel, its thermal resistance is relatively higher than that of aluminum, providing insulation for the cooling water and reducing the heat transfer from the external environment to the cooling water. The water-cooled cover plate 2 is made of two composite plates, which makes it have good welding performance and corrosion resistance with the water-cooled tank plate 3, and also achieve good heat exchange with the inside of the battery tray, which facilitates the cooling of the battery inside the battery tray.

[0027] In one embodiment, such as Figure 1As shown, the water-cooled cover plate 2 is integrally stamped from a steel-aluminum composite plate, comprising a first layer 201 and a second layer 202. The first layer 201 is made of stainless steel, and the second layer 202 is made of aluminum. The thickness of the stainless steel layer of the water-cooled cover plate 2 is 0.2-0.4 mm, the thickness of the aluminum layer of the water-cooled cover plate 2 is 0.4-0.6 mm, and the thickness of the water-cooled channel plate 3 is 0.6-1.5 mm. In a preferred embodiment, the thickness of the water-cooled channel plate 3 is 1.5 mm, the overall thickness of the water-cooled cover plate 2 is 1 mm, wherein the thickness of the steel layer of the water-cooled cover plate 2 is 0.4 mm, and the thickness of the aluminum layer of the water-cooled cover plate 2 is 0.6 mm. In this embodiment, the water-cooled cover plate 2 is made of a steel-aluminum composite plate, which not only improves the strength of the water-cooled plate itself but also meets the load-bearing requirements of the battery pack, thus improving the protection level of the water-cooled plate for the battery pack. Furthermore, the steel plate layer of the water-cooled cover plate 2 and the water-cooled channel plate 3 meet the anti-corrosion requirements, exhibiting good corrosion resistance. The manufacturing process of the steel-aluminum composite plate is mature and cost-effective. In this embodiment, the steel plate layer in the water-cooled cover plate 2 should not be too thin, as this could easily lead to melting and damage to the aluminum plate layer of the water-cooled cover plate 2 during welding.

[0028] The present invention proposes a composite cooling plate for a battery tray. The water-cooling cover plate 2 is preferably made of a steel-aluminum composite plate composed of a stainless steel plate and an aluminum plate. In other embodiments, the water-cooling cover plate 2 may also include a copper-aluminum composite plate or a titanium-aluminum composite plate based on the aluminum plate layer. That is, the first plate layer 201 is a copper plate or a titanium plate. It is not limited to the two-layer plate structure of the steel-aluminum composite plate mentioned above. The water-cooling cover plate 2 and the water-cooling tank plate 3 with the same structure in the same position can be welded. All of these are within the protection scope of the present application.

[0029] In other embodiments, the second plate layer 201 in the water-cooled cover plate 2 can also be replaced with other materials with excellent heat dissipation, such as copper plates or graphene. Preferably, the second plate layer 201 is made of aluminum plate, which offers high cost-effectiveness in heat dissipation.

[0030] As a technical solution proposed in this utility model, when applied to the field of battery trays, the aluminum plate layer of the water-cooled cover plate 2 is bonded to the battery pack in the battery tray for cooling. In practical applications, the battery pack conducts the heat generated by itself to the aluminum plate layer of the water-cooled cover plate 2, and then transfers it to the cooling water channel 33 between the water-cooled trough plate 3 and the water-cooled cover plate 2 to carry away the heat generated by the battery pack.

[0031] This utility model provides a composite water-cooled plate for a battery tray. The good weldability of the steel plates of the water-cooled trough plate 3 and the water-cooled cover plate 2 allows for integration using mature processes such as spot welding or resistance welding, reducing manufacturing costs. The cooling water channel 33 is positioned between the stainless steel plates of the water-cooled trough plate 3 and the water-cooled cover plate 2, effectively solving the problem of easy oxidation and corrosion of existing aluminum liquid cooling plates. Furthermore, stainless steel generally exhibits better corrosion resistance than aluminum.

[0032] The battery pack is placed near the aluminum plate layer of the water-cooled cover plate 2 to conduct heat, which can be carried away through the cooling water channel to achieve the heat dissipation effect; since the steel plate has low thermal resistance, it also has the effect of heat insulation.

[0033] The composite water-cooled plate provided by this utility model is a water-cooled plate composed of steel plate and steel-aluminum composite plate, which increases the overall strength of its structure, solves the problem of poor structural strength of all-aluminum liquid-cooled plates in the prior art, improves its load-bearing capacity and the protection level of the battery tray, and enables the battery pack to operate safely.

[0034] The parts not covered in this technical solution can be implemented using existing technologies.

[0035] The foregoing has shown and described the basic principles, main features, and characteristics of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model includes the appended claims and their equivalents.

Claims

1. A composite water-cooled plate for a battery tray, characterized in that: include: A water-cooled tank plate, wherein one side of the water-cooled tank plate is recessed to form a water channel groove; The water-cooled cover plate is a composite plate formed by a first plate layer and a second plate layer. The water-cooled cover plate covers the water-cooled trough plate, and the first plate layer and the water-cooled trough plate are connected by a resist weld. A cooling water flow channel for heat exchange is formed between the water-cooled trough plate and the water-cooled cover plate.

2. The composite water-cooled plate for a battery tray according to claim 1, characterized in that: The water channel groove is provided with multiple sets of parallel DC section grooves, and the ends of adjacent DC section grooves are connected by arc-shaped grooves.

3. The composite water-cooled plate for a battery tray according to claim 1, characterized in that: The first plate is a stainless steel plate, and the water-cooled trough plate is made of stainless steel. The first plate is welded to the water-cooled trough plate with water channel grooves to form a sealed cooling water flow channel.

4. The composite water-cooled plate for a battery tray according to claim 3, characterized in that: The water-cooling groove on the water-cooling trough plate is integrally stamped, and the water-cooling trough plate and the water-cooling cover plate are connected by spot welding or resistance welding.

5. The composite water-cooled plate for a battery tray according to claim 3, characterized in that: The second layer is an aluminum plate layer.

6. The composite water-cooled plate for a battery tray according to claim 5, characterized in that: The thickness of the water-cooled tank plate is 0.6-1.5mm; the thickness of the stainless steel plate layer of the first plate layer is 0.2-0.4mm; and the thickness of the aluminum plate layer of the water-cooled cover plate is 0.4-0.6mm.

7. The composite water-cooled plate for a battery tray according to claim 1, characterized in that: The second layer of the water-cooled cover plate is an aluminum plate layer, and the first layer is a copper plate layer or a titanium plate layer.

8. A battery tray comprising a composite water-cooled plate of any one of claims 1-7.

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