A passivated corrosion-resistant power battery cooling plate, power battery and vehicle

Abstract

The utility model belongs to vehicle parts technical field relates to a passivation anticorrosion's power battery cooling plate, power battery and vehicle, power battery cooling plate includes the even temperature board and flow channel board of mutual adhesion, the even temperature board and flow channel board between form the flow channel cavity of cooling medium, at least one side surface of even temperature board and / or flow channel board forms the passivation film in situ, the utility model discloses a passivation film is formed in situ on the surface of cooling plate, not only realizes anticorrosion function, and replaced the anticorrosion coating that traditional adopted, lightened the weight of parts, guaranteed lightweight design.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle parts technology, and relates to a power battery cooling plate, and more particularly to a passivated and corrosion-resistant power battery cooling plate, a power battery, and a vehicle. Background Technology

[0002] The power battery cooling plate (hereinafter referred to as "cooling plate") is a core component of the electric vehicle battery thermal management system. It is equipped with channels for the flow of cooling medium. The flow of cooling medium realizes heat exchange between the cooling plate and the battery, thereby regulating the temperature of the battery cells. In order to ensure that the cooling plate does not leak during use, corrosion prevention needs to be a key consideration in the design of the cooling plate.

[0003] Generally speaking, corrosion of cooling plates is divided into internal corrosion and external corrosion. As the name suggests, internal corrosion occurs inside the cooling plate and is usually caused by corrosive ions such as chloride ions and fluoride ions in the cooling medium; external corrosion occurs on the outside of the cooling plate and is usually caused by sewage entering the battery pack after the vehicle has driven through water.

[0004] Currently, commonly used cooling plates consist of an upper heat spreader plate and a lower flow channel plate, which are connected by brazing to form a flow channel cavity. The cooling medium flows in the cavity and exchanges heat with the battery through the heat spreader plate. The heat spreader plate is covered with an insulating coating.

[0005] However, the above-mentioned anti-corrosion design scheme for cooling plates has the following defects: (1) To prevent external corrosion, technicians usually add an anti-corrosion coating to the outside of the flow channel plate, but the anti-corrosion coating will generate additional costs and weight, which is not conducive to the lightweight design of the battery system and the improvement of product competitiveness. (2) To prevent internal corrosion, technicians either add corrosion inhibitors to the cooling medium to delay the corrosion of the cooling medium on the cooling plate, or increase the wall thickness of the cooling plate to provide corrosion margin. However, adding corrosion inhibitors will increase the conductivity of the cooling medium and reduce insulation. In extreme cases, it may even lead to coolant leakage and short circuit fire. Increasing the wall thickness of the cooling plate will also generate additional costs and weight, and there is still a lot of room for improvement.

[0006] Therefore, how to improve the existing power battery cooling plate to achieve corrosion resistance while ensuring lightweight design has become an urgent problem that needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a passivated and anti-corrosion power battery cooling plate, power battery and vehicle. By forming a passivation film in situ on the surface of the cooling plate, not only is the anti-corrosion function achieved, but it also replaces the traditional anti-corrosion coating, reduces the weight of the parts and ensures lightweight design.

[0008] To achieve the objective of this utility model, the following technical solution is adopted:

[0009] In a first aspect, the present invention provides a passivated and corrosion-resistant power battery cooling plate, comprising a heat spreader plate and a flow channel plate that are attached to each other, wherein a flow channel cavity for cooling medium is formed between the heat spreader plate and the flow channel plate, and a passivation film is formed in situ on at least one side surface of the heat spreader plate and / or the flow channel plate.

[0010] This invention forms a passivation film in situ on the surface of the cooling plate that requires corrosion protection, isolating the metal from the corrosive medium. This not only achieves corrosion protection and reduces the risk of leakage of the cooling medium, but also replaces the traditional anti-corrosion coating, reduces the weight of the components, and ensures a lightweight design.

[0011] Furthermore, compared to anti-corrosion coatings, the passivation film used in this invention typically uses recyclable raw materials during the passivation process, resulting in a significant cost advantage.

[0012] Preferably, the in-situ formation method of the passivation film includes any one of chemical passivation, electrochemical passivation, physical passivation, or thermal passivation.

[0013] Optionally, a passivation film is formed in situ on the inner surface of the heat spreader and the inner surface of the flow channel plate.

[0014] Optionally, a passivation film is formed in situ on the outer surface of the flow channel plate.

[0015] Optionally, a passivation film is formed in situ on the inner surface of the heat spreader and the inner and outer surfaces of the flow channel plate.

[0016] Preferably, the passivation film avoids the bonding area between the heat spreader and the flow channel plate.

[0017] Preferably, the thickness of the passivation film is 100-1000 nm.

[0018] Preferably, the outermost surface of the heat spreader away from the flow channel plate is further provided with an insulating coating.

[0019] Preferably, the thickness of the insulating coating is 50-250 μm.

[0020] Preferably, the thickness of the heat spreader is 0.8-1.5 mm.

[0021] Preferably, the thickness of the flow channel plate is 0.8-1.5 mm.

[0022] Secondly, this utility model provides a power battery, which includes a power battery cooling plate as described in the first aspect.

[0023] Thirdly, this utility model provides a vehicle that includes the power battery as described in the second aspect.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) This utility model forms a passivation film in situ on the surface of the cooling plate that requires corrosion protection, thereby isolating the metal from the corrosive medium. This not only achieves the corrosion protection function and reduces the risk of leakage of the cooling medium, but also replaces the traditional anti-corrosion coating, reduces the weight of the parts, and ensures a lightweight design.

[0026] (2) Compared with anti-corrosion coatings, the passivation film used in this utility model can usually be recycled in the passivation process, which has a significant cost advantage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the cross-section of the power battery cooling plate provided by this utility model;

[0028] Figure 2 This is a schematic diagram showing the brazing areas of the flow channel plate (a) and the heat spreader plate (b) before passivation.

[0029] Figure 3 This is a schematic diagram of the inlet and outlet of the passivation fluid in the cooling plate;

[0030] Figure 4 This is a schematic diagram of the cross-section of the power battery cooling plate provided in Comparative Example 1.

[0031] Wherein: 1-heat spreader; 2-flow channel plate; 3-flow channel cavity; 4-passivation film; 5-insulating coating; 6-passivation zone; 7-shielding zone; 8-inlet; 9-outlet; 10-anti-corrosion coating. Detailed Implementation

[0032] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.

[0033] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The technical solution of this utility model will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0035] One embodiment of this utility model provides a passivated and corrosion-resistant power battery cooling plate, such as... Figure 1 As shown, the power battery cooling plate includes a heat spreader plate 1 and a flow channel plate 2 that are attached to each other. A flow channel cavity 3 for cooling medium is formed between the heat spreader plate 1 and the flow channel plate 2. A passivation film 4 is formed in situ on at least one side surface of the heat spreader plate 1 and / or the flow channel plate 2.

[0036] This invention forms a passivation film 4 in situ on the surface of the cooling plate where corrosion protection is required, isolating the metal from the corrosive medium. This not only achieves corrosion protection and reduces the risk of cooling medium leakage, but also replaces the traditional anti-corrosion coating 10 (see...). Figure 4 This reduces the weight of components and ensures a lightweight design.

[0037] Furthermore, compared to the anti-corrosion coating 10, the passivation film 4 used in this invention typically uses recyclable raw materials during the passivation process, resulting in a significant cost advantage.

[0038] Taking aluminum and sodium chloride solution as an example of metal corrosion, since the electrode potential of aluminum is lower than that of sodium chloride solution, a potential difference exists between the two, forming a galvanic cell. The lower-potential aluminum acts as the anode, and the higher-potential sodium chloride solution acts as the cathode. Current flows from the lower-potential anode to the higher-potential cathode. During this process, aluminum loses electrons and undergoes oxidation, continuously dissolving in the sodium chloride solution, thus causing corrosion. In the cooling plates of power batteries, the metal cooling plates come into contact with the electrolyte solution, resulting in corrosion. The internal and external corrosion mechanisms are the same as above and will not be elaborated upon here.

[0039] To address the aforementioned corrosion phenomenon, this invention performs passivation treatment on the cooling plate, forming a dense thin film in situ on the surface requiring corrosion resistance. This effectively isolates the underlying metal from contact with the corrosive medium. The process of forming this film is called passivation, and the resulting film is the passivation film 4. This passivation film 4 adheres tightly to the metal surface, altering the metal surface state and causing a jump in the metal's electrode potential from negative to positive (the more negative the electrode potential, the easier it is to corrode; the more positive the electrode potential, the more difficult it is to corrode), thus creating a corrosion-resistant passive state.

[0040] In some embodiments, the in-situ formation of the passivation film 4 includes any one of chemical passivation, electrochemical passivation, physical passivation, or thermal passivation, as detailed below:

[0041] (1) Chemical passivation: A passivation film is formed by the contact between the metal surface and a chemical solution of a certain concentration (sulfuric acid, nitric acid, chromic acid, etc.).

[0042] (2) Electrochemical passivation: using an applied current (connecting the metal to the positive terminal of a DC power supply) to anoly polarize it and form a passivation film 4.

[0043] (3) Physical passivation: The metal surface is treated by mechanical means (sandblasting, polishing, coating, etc.) to form a passivation film 4.

[0044] (4) Heat treatment passivation: The metal is subjected to high temperature treatment, and the formation of passivation film 4 is accelerated under the combined action of water and oxygen.

[0045] In practical applications, the specific passivation process can be determined according to the anti-corrosion requirements. As long as a passivation film 4 can be formed, no specific passivation conditions are specified here.

[0046] In some embodiments, when there are high requirements for corrosion prevention against internal corrosion, the passivation film 4 can be formed in situ on the surface that is in contact with the cooling medium, that is, the inner surface of the heat spreader 1 and the inner surface of the flow channel plate 2 are both formed in situ with the passivation film 4.

[0047] In some embodiments, when there are high requirements for corrosion protection against external corrosion, the passivation film 4 can be formed in situ on the surface that is in contact with the external environment, that is, the passivation film 4 is formed in situ on the outer surface of the flow channel plate 2.

[0048] In some embodiments, when there are high requirements for corrosion prevention against both internal and external corrosion, a passivation film 4 is formed in situ on the inner surface of the temperature distribution plate 1 and the inner and outer surfaces of the flow channel plate 2.

[0049] In this invention, since the outer surface of the heat spreader 1 is in direct contact with the battery pack, there is usually no harsh corrosive environment, so there is no need to form a passivation film 4 in situ on the outer surface of the heat spreader 1.

[0050] The inner surface refers to one side surface located inside the flow channel cavity 3, and the outer surface refers to one side surface located outside the flow channel cavity 3.

[0051] In some embodiments, the passivation film 4 avoids the contact area between the heat spreader 1 and the flow channel plate 2.

[0052] Generally, the bonding method between the heat spreader 1 and the flow channel plate 2 is mainly brazing. When the flow channel cavity 3 inside the cooling plate needs to be passivated for corrosion protection (i.e., both the inner surface of the heat spreader 1 and the inner surface of the flow channel plate 2 need to be passivated), the passivation will interfere with the brazing. This problem can be solved by adopting either of the following two solutions:

[0053] (A) Passivate first, then braze: For example Figure 2 As shown in the shaded area, before brazing, the brazing areas of the heat spreader 1 and the flow channel plate 2 are shielded respectively, and the cooling plate is divided into a passivation area 6 and a shielding area 7 to ensure that the brazing area is not passivated, thereby avoiding the passivation film 4 from affecting the brazing process.

[0054] (B) Brazing followed by passivation: For example... Figure 3 As shown by the dashed lines, the heat spreader 1 and the flow channel plate 2 are first brazed. Then, passivation liquid is introduced into the cooling plate through the inlet 8 and flows out through the outlet 9. This passivates the wall of the flow channel cavity 3 inside the cooling plate without affecting the brazing area, thus achieving corrosion protection on the inner surface of the cooling plate. Since passivation liquid needs to be introduced into the cooling plate, chemical passivation is preferred in this scheme.

[0055] In some embodiments, the thickness of the passivation film 4 is 100-1000 nm, for example, it can be 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 750 nm, 800 nm, 850 nm, 900 nm, 950 nm or 1000 nm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0056] This invention effectively balances the corrosion resistance of the cooling plate and production costs by limiting the thickness range of the passivation film 4. When the thickness of the passivation film 4 is less than 100 nm, the excessively thin passivation film 4 cannot provide good corrosion protection and may even lead to leakage of the cooling medium; when the thickness of the passivation film 4 is greater than 1000 nm, the improvement in the corrosion resistance of the cooling plate is not significant, and it results in an unnecessary increase in production costs.

[0057] In some embodiments, the outermost surface of the heat spreader 1 away from the flow channel plate 2 is provided with an insulating coating 5 to prevent the electrolyte from contacting the heat spreader 1 and causing a short circuit.

[0058] Specifically, when selecting the passivation process and passivation parameters, it is necessary to ensure that the passivated metal can tightly adhere to the insulating coating 5. The shear strength test of the adhesive interface is carried out in accordance with the national standard GB / T 7124-2008. The shear force is required to be ≥10MPa at -40℃, ≥10MPa at 25℃, and ≥5MPa at 70℃. Separation should occur between the adhesive and the insulating coating 5, and the insulating coating 5 should not fall off the metal surface.

[0059] In this invention, although the insulating coating 5 can also achieve anti-corrosion function to a certain extent, its main function is to prevent short circuits caused by contact between the electrolyte and the heat spreader 1. After all, the outer surface of the heat spreader 1 is in direct contact with the battery pack and is usually not in a harsh corrosive environment. Compared with the in-situ formed passivation film 4, the insulating coating 5 needs to be additionally provided, and the method of application can be spraying or coating. Since both the cooling plate with the traditional anti-corrosion coating 10 and the cooling plate with the in-situ formed passivation film 4 of this invention are provided with the insulating coating 5, the presence of the insulating coating 5 does not contribute to the weight difference and cost difference between the two types of cooling plates, that is, it does not affect the lightweight design of the battery system.

[0060] In some embodiments, the thickness of the insulating coating 5 is 50-250 μm, for example, it can be 50 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, 200 μm, 220 μm, 240 μm or 250 μm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0061] In some embodiments, the thickness of the heat spreader 1 is 0.8-1.5 mm, for example, it can be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0062] In some embodiments, the thickness of the flow channel plate 2 is 0.8-1.5 mm, for example, it can be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, but is not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0063] In some embodiments, the heat spreader 1 and the flow channel plate 2 are made of aluminum alloy and / or stainless steel, respectively.

[0064] The aluminum alloys include, but are not limited to, 3-series aluminum alloys (Al-Mn alloys), 5-series aluminum alloys (Al-Mg alloys), and 6-series aluminum alloys (Al-Si-Mg alloys); the stainless steel is suitable for applications requiring high structural strength.

[0065] One embodiment of this utility model provides a power battery, which includes the power battery cooling plate described in any of the above embodiments.

[0066] One embodiment of this utility model provides a vehicle that includes the power battery described in any of the above embodiments.

[0067] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the numerical range that are not listed. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list all the specific point values ​​included in the range.

[0068] Example 1

[0069] This embodiment provides a passivated and corrosion-resistant power battery cooling plate, such as... Figure 1 As shown, the power battery cooling plate includes a heat spreader plate 1 and a flow channel plate 2 that are attached to each other. A flow channel cavity 3 for cooling medium is formed between the heat spreader plate 1 and the flow channel plate 2. A passivation film 4 with a thickness of 500 nm is formed in situ on the inner surface of the heat spreader plate 1 and the inner and outer surfaces of the flow channel plate 2. The passivation film 4 is formed by chemical passivation. The passivation solution is an 8 wt% chromic acid solution. The passivation film 4 avoids the contact area between the heat spreader plate 1 and the flow channel plate 2 by means of brazing first and then passivation.

[0070] In this embodiment, the outermost surface of the heat spreader 1 away from the flow channel plate 2 is provided with an insulating coating 5 with a thickness of 150μm to prevent the electrolyte from contacting the heat spreader 1 and causing a short circuit. The insulating coating 5 is made of epoxy powder. The thickness of the heat spreader 1 and the flow channel plate 2 is 1.2mm, and the material is 3-series Al-Mn alloy.

[0071] Example 2

[0072] This embodiment provides a passivated and corrosion-resistant power battery cooling plate. The power battery cooling plate includes a heat spreader plate 1 and a flow channel plate 2 that are attached to each other. A flow channel cavity 3 for cooling medium is formed between the heat spreader plate 1 and the flow channel plate 2. A passivation film 4 with a thickness of 500nm is formed in situ on the outer surface of the flow channel plate 2. That is, the passivation film 4 is formed in situ only on the outer wall surface of the cooling plate. The passivation film 4 is formed by sandblasting. The sandblasting material is quartz sand. The passivation film 4 is formed by first brazing and then passivating to ensure that the passivation film 4 avoids the inner surface of the heat spreader plate 1 and the flow channel plate 2.

[0073] In this embodiment, the outermost surface of the heat spreader 1 away from the flow channel plate 2 is provided with an insulating coating 5 with a thickness of 250μm to prevent the electrolyte from contacting the heat spreader 1 and causing a short circuit. The insulating coating 5 is made of epoxy powder. The thickness of the heat spreader 1 is 0.8mm, the thickness of the flow channel plate 2 is 1.5mm, and both are made of 5-series Al-Mg alloy.

[0074] Example 3

[0075] This embodiment provides a passivated and corrosion-resistant power battery cooling plate, which includes a heat spreader plate 1 and a flow channel plate 2 that are attached to each other. A flow channel cavity 3 for cooling medium is formed between the heat spreader plate 1 and the flow channel plate 2. A passivation film 4 with a thickness of 500 nm is formed in situ on the inner surface of both the heat spreader plate 1 and the inner surface of the flow channel plate 2. That is, the passivation film 4 is formed in situ only on the inner wall surface of the flow channel cavity 3. The passivation film 4 is formed by chemical passivation, and the passivation solution is an 8wt% chromic acid solution. The passivation film 4 is formed by first brazing and then passivating to ensure that the passivation film 4 avoids the contact area between the heat spreader plate 1 and the flow channel plate 2.

[0076] In this embodiment, the outermost surface of the heat spreader 1 away from the flow channel plate 2 is provided with an insulating coating 5 with a thickness of 50μm to prevent the electrolyte from contacting the heat spreader 1 and causing a short circuit. The insulating coating 5 is made of epoxy powder. The thickness of the heat spreader 1 and the flow channel plate 2 is 1.2mm, and the material is stainless steel.

[0077] Example 4

[0078] This embodiment provides a passivated and corrosion-resistant power battery cooling plate, which includes a heat spreader plate 1 and a flow channel plate 2 that are attached to each other. A flow channel cavity 3 for cooling medium is formed between the heat spreader plate 1 and the flow channel plate 2. A passivation film 4 with a thickness of 500nm is formed in situ on the outer surface of the flow channel plate 2. That is, the passivation film 4 is formed in situ only on the outer wall surface of the cooling plate. The passivation film 4 is formed by heat treatment passivation. The passivation film 4 avoids the inner surface of the heat spreader plate 1 and the flow channel plate 2 by brazing first and then passivating.

[0079] In this embodiment, the outermost surface of the heat spreader 1 away from the flow channel plate 2 is provided with an insulating coating 5 with a thickness of 150μm to prevent the electrolyte from contacting the heat spreader 1 and causing a short circuit. The insulating coating 5 is made of epoxy powder. The thickness of the heat spreader 1 and the flow channel plate 2 is 1.2mm, and the material is 6-series Al-Si-Mg alloy.

[0080] Example 5

[0081] This embodiment provides a passivated and corrosion-resistant power battery cooling plate. Except for adjusting the chemical passivation time to change the thickness of the passivation film 4 to 80nm, the rest of the structure and conditions are the same as in Embodiment 1, so they will not be described in detail here.

[0082] Example 6

[0083] This embodiment provides a passivated and corrosion-resistant power battery cooling plate. Except for adjusting the chemical passivation time to change the thickness of the passivation film 4 to 100nm, the other structures and conditions are the same as in Embodiment 1, so they will not be described in detail here.

[0084] Example 7

[0085] This embodiment provides a passivated and corrosion-resistant power battery cooling plate. Except for adjusting the chemical passivation time to change the thickness of the passivation film 4 to 1000 nm, the other structures and conditions are the same as in Embodiment 1, so they will not be described in detail here.

[0086] Example 8

[0087] This embodiment provides a passivated and corrosion-resistant power battery cooling plate. Except for adjusting the chemical passivation time to change the thickness of the passivation film 4 to 1200nm, the other structures and conditions are the same as in Embodiment 1, so they will not be described in detail here.

[0088] Comparative Example 1

[0089] This comparative example provides a power battery cooling plate, such as... Figure 4 As shown, the power battery cooling plate does not form a passivation film 4 in situ on either side of the heat exchange plate 1 and the flow channel plate 2. Instead, a 150μm thick anti-corrosion coating 10 is provided on the outer surface of the flow channel plate 2. The anti-corrosion coating 10 is made of epoxy coating. The remaining structure and conditions are the same as in Example 1, so they will not be described in detail here.

[0090] Corrosion tests were conducted on the power battery cooling plates obtained in Examples 1-8 and Comparative Example 1, and no leakage of the cooling medium was observed, indicating that the power battery cooling plates obtained in the above examples and comparative examples all have good anti-corrosion function.

[0091] However, compared to Example 1, the corrosion depth ratio of the cooling plate obtained in Example 5 is relatively high, indicating that an excessively thin passivation film will have a certain degree of adverse effect on the anti-corrosion function. The corrosion depth ratio of the cooling plate obtained in Example 8 is basically consistent with that in Example 7, indicating that the anti-corrosion functions of the two are basically the same. However, the excessively thick passivation film in Example 8 unnecessarily increases the production cost.

[0092] In addition, compared to Example 1, Comparative Example 1 uses an anti-corrosion coating to avoid metal corrosion. Although it can also achieve the anti-corrosion effect, since the anti-corrosion coating is not formed in situ, it will inevitably generate additional costs and weight, which is not conducive to the lightweight design of the battery system and the improvement of product competitiveness.

[0093] As can be seen, this utility model forms a passivation film in situ on the surface of the cooling plate that requires corrosion protection, thus isolating the metal from the corrosive medium. This not only achieves the corrosion protection function and reduces the risk of leakage of the cooling medium, but also replaces the traditional anti-corrosion coating, reduces the weight of the parts, and ensures a lightweight design.

[0094] Furthermore, compared to anti-corrosion coatings, the passivation film used in this invention typically uses recyclable raw materials during the passivation process, resulting in a significant cost advantage.

[0095] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A passivated and corrosion-resistant power battery cooling plate, comprising a heat spreader plate and a flow channel plate that are bonded together, wherein a flow channel cavity for a cooling medium is formed between the heat spreader plate and the flow channel plate, characterized in that, A passivation film is formed in situ on at least one side surface of the heat spreader and / or flow channel plate.

2. The passivated and corrosion-resistant power battery cooling plate according to claim 1, characterized in that, The in-situ formation of the passivation film includes any one of chemical passivation, electrochemical passivation, physical passivation, or thermal passivation.

3. The passivated and corrosion-resistant power battery cooling plate according to claim 1, characterized in that, Both the inner surface of the heat spreader and the inner surface of the flow channel plate are formed with passivation films in situ.

4. The passivated and corrosion-resistant power battery cooling plate according to claim 1, characterized in that, A passivation film is formed in situ on the outer surface of the flow channel plate.

5. The passivated and corrosion-resistant power battery cooling plate according to claim 1, characterized in that, The inner surface of the heat spreader and the inner and outer surfaces of the flow channel plate are both in situ formed with passivation films.

6. The passivated and corrosion-resistant power battery cooling plate according to any one of claims 1-5, characterized in that, The passivation film avoids the bonding area between the heat spreader and the flow channel plate.

7. The passivated and corrosion-resistant power battery cooling plate according to any one of claims 1-5, characterized in that, The passivation film has a thickness of 100-1000 nm.

8. The passivated and corrosion-resistant power battery cooling plate according to any one of claims 1-5, characterized in that, The outermost surface of the heat spreader away from the flow channel plate is provided with an insulating coating. The thickness of the insulating coating is 50-250 μm.

9. A power battery, characterized in that, The power battery includes a power battery cooling plate as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the power battery as described in claim 9.

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