Anti-corrosion liquid cooling assembly and battery pack

Abstract

The invention relates to the technical field of electric energy storage, and particularly discloses an anti-corrosion liquid cooling assembly and a battery pack, the anti-corrosion liquid cooling assembly comprises a liquid cooling plate and a bottom protection plate arranged opposite to the liquid cooling plate; the surface, close to the bottom protection plate, of the liquid cooling plate is coated with a bottom face insulation anti-corrosion coating in a spraying mode. According to the anti-corrosion liquid cooling assembly and the battery pack provided by the invention, the problem that the liquid cooling plate is easily corroded after the air tightness between the liquid cooling plate and the bottom protection plate is reduced can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to an anti-corrosion liquid cooling component and a battery pack. Background Art

[0002] A battery pack typically includes:

[0003] A battery box, the battery box comprising a box frame and a bottom guard plate located at the bottom of the box frame;

[0004] A liquid cooling plate, the liquid cooling plate being located above the bottom guard plate;

[0005] A plurality of battery cells, each of which is located above the liquid cooling plate.

[0006] Among them, the liquid cooling plate is a common battery heat exchange component, which is usually formed by welding an upper cold plate and a lower cold plate. A liquid flow channel is provided between the upper cold plate and the lower cold plate. When cooling liquid (such as water, ethylene glycol aqueous solution or other coolants) is sent into the liquid flow channel, the heat released by the battery cell can be effectively absorbed and transferred.

[0007] In order to prevent external water vapor from corroding the bottom surface of the liquid cooling plate, sealing rings are generally provided at the edges of the liquid cooling plate and the bottom guard plate. However, after a long period of use, the sealing ring will age, and the air tightness between the liquid cooling plate and the bottom guard plate will decrease; or the bumps and vibrations caused by the car driving will cause the fasteners to loosen, and the air tightness between the liquid cooling plate and the bottom guard plate will also decrease. At this time, external water vapor will enter the space between the liquid cooling plate and the bottom guard plate, and then corrode the liquid cooling plate.

[0008] Once corrosion occurs in the liquid flow channel, high-pressure cooling liquid will easily leak out, causing a short circuit in the battery at the very least, or even an explosion or other safety accident at the worst.

[0009] Therefore, it is necessary to improve the existing battery pack to solve the problem that the liquid cooling plate is susceptible to corrosion after the air tightness between the liquid cooling plate and the bottom guard plate decreases.

[0010] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0011] An object of the present invention is to provide an anti-corrosion liquid cooling assembly and a battery pack, which can effectively solve the problem that the liquid cooling plate is susceptible to corrosion after the air tightness between the liquid cooling plate and the bottom guard plate decreases.

[0012] To achieve the above objectives, on the one hand, the present invention provides an anti-corrosion liquid cooling assembly, comprising a liquid cooling plate, and a bottom guard plate arranged opposite to the liquid cooling plate;

[0013] Wherein, the surface of the liquid cooling plate close to the bottom guard plate is sprayed with a bottom insulating anti-corrosion coating.

[0014] Optionally, the coating thickness of the insulating anti-corrosion coating on the bottom surface at the edge of the liquid cooling plate is a, and the coating thickness of the insulating anti-corrosion coating on the bottom surface at the middle of the liquid cooling plate is b; a and b satisfy: a>b.

[0015] Optionally, a is 0.06mm-0.35mm, and b is 0.06mm-0.15mm.

[0016] Optionally, a top surface insulating anti-corrosion coating is sprayed on the surface of the liquid cooling plate away from the bottom guard plate;

[0017] Wherein, the coating thickness dimension c of the top surface insulating anti-corrosion coating is 0.15mm±0.05mm.

[0018] Optionally, a supporting foam for supporting the liquid cooling plate is provided between the liquid cooling plate and the bottom guard plate, and the supporting foam is sealed with the liquid cooling plate on one side facing the liquid cooling plate to form a first sealing surface, and the supporting foam is sealed with the bottom guard plate on one side away from the liquid cooling plate to form a second sealing surface.

[0019] Optionally, an elastic portion is provided at an edge of the bottom guard plate, and a middle position of the elastic portion protrudes in a direction away from the liquid cooling plate and forms a shrinkage space with the supporting foam.

[0020] Optionally, an inclined surface is provided at an edge of a side surface of the supporting foam away from the liquid cooling plate, one end of the inclined surface is connected to the second sealing surface, and the other end abuts against the elastic part to form the shrinkage space.

[0021] Optionally, a connecting portion is further provided at the edge of the bottom guard plate, and a sealing ring is provided between the connecting portion and the liquid cooling plate;

[0022] A chamfered portion is connected between the connecting portion and the elastic portion, and the chamfered portion protrudes toward the liquid cooling plate so as to form a deformation space enclosed by the supporting foam, the sealing ring, the liquid cooling plate, and the chamfered portion.

[0023] Optionally, the liquid cooling plate includes an upper cooling plate and a lower cooling plate.

[0024] The lower cold plate is provided with a flow channel area for cooperating with the upper cold plate to surround and form a liquid flow channel, and a welding area for welding and fixing with the upper cold plate;

[0025] At least the flow channel region is provided with the bottom surface insulating anti-corrosion coating.

[0026] Optionally, sealing rings are provided at the edges of both the liquid cooling plate and the bottom guard plate.

[0027] On the other hand, a battery pack is provided, comprising a box frame, the anti-corrosion liquid cooling assembly located at the bottom of the box frame, a box top cover located at the top of the box frame, and electrical components located within the box frame.

[0028] The beneficial effects of the present invention are: providing an anti-corrosion liquid cooling assembly and a battery pack. When the air tightness between the liquid cooling plate and the bottom guard plate decreases, causing external water vapor to enter between the liquid cooling plate and the bottom guard plate, since the surface of the liquid cooling plate close to the bottom guard plate is sprayed with a bottom insulating anti-corrosion coating, the external water vapor cannot directly corrode the liquid cooling plate. This can solve the problem that the liquid cooling plate is susceptible to corrosion after the air tightness between the liquid cooling plate and the bottom guard plate decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 An exploded schematic diagram of a battery pack provided in an embodiment;

[0031] Figure 2 A schematic cross-sectional view of a battery pack provided in an embodiment;

[0032] Figure 3 A bottom view of a liquid cooling plate provided in an embodiment.

[0033] In the figure:

[0034] 1. Box frame;

[0035] 2. Anticorrosive liquid cooling assembly; 201. Liquid cooling plate; 2011. Upper cold plate; 2012. Lower cold plate; 2012a. Flow channel area; 2012b. Welding area; 2012c. Liquid flow channel; 202. Bottom guard plate; 2021. Elastic part; 2022. Feedback space; 2023. Connecting part; 2024. Chamfered part; 203. Sealing ring; 204. Support foam; 2041. First sealing surface; 2042. Second sealing surface; 2043. Inclined surface; 205. Deformation space;

[0036] 3. Top cover of the box. DETAILED DESCRIPTION

[0037] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The word "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0038] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0039] In the description of the present invention, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0040] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0041] Without further restrictions, in the present invention, the words "include", "comprises", "has" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0042] Similar to the understanding in the Examination Guidelines, in the present invention, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of the present invention, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0043] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0044] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms such as "install", "connect", "connect", "fix", "set" and the like used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the technical field to which the present invention belongs, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0045] The present invention provides an anti-corrosion liquid cooling assembly and a battery pack, which are suitable for a battery system requiring high anti-corrosion performance and reliable heat dissipation, and can effectively solve the problem that the liquid cooling plate is susceptible to corrosion after the air tightness between the liquid cooling plate and the bottom guard plate decreases.

[0046] See also Figure 1 and Figure 2 In this embodiment, the battery pack includes a box frame 1, an anti-corrosion liquid cooling assembly 2 located at the bottom of the box frame 1, a box top cover 3 located at the top of the box frame 1, and electrical components located in the box frame 1. Specifically, the electrical components include battery cells and a BMS management system, etc., which is not the focus of the present invention and will not be described in detail.

[0047] In this embodiment, the anti-corrosion liquid cooling assembly 2 includes a bottom guard plate 202 fastened to the bottom of the box frame 1, a liquid cooling plate 201 arranged opposite to the liquid cooling plate 201 and located above the bottom guard plate 202, and a sealing ring 203 located at the edge of the liquid cooling plate 201 and the bottom guard plate 202. The surface of the liquid cooling plate 201 close to the bottom guard plate 202 is sprayed with a bottom insulating anti-corrosion coating.

[0048] The corrosion-resistant liquid cooling assembly 2 and battery pack provided in this embodiment, when the air tightness between the liquid cooling plate 201 and the bottom guard plate 202 decreases and causes external water vapor to enter between the liquid cooling plate 201 and the bottom guard plate 202, since the surface of the liquid cooling plate 201 close to the bottom guard plate 202 is sprayed with a bottom insulating anti-corrosion coating, the external water vapor cannot directly corrode the liquid cooling plate 201, thereby solving the problem that the liquid cooling plate 201 is susceptible to corrosion after the air tightness between the liquid cooling plate 201 and the bottom guard plate 202 decreases.

[0049] The erosion of external water vapor is a process that gradually spreads from the edge of the liquid cooling plate 201 to the middle. Figure 3 , the coating thickness of the bottom surface insulating anti-corrosion coating at the edge of the liquid cooling plate 201 can be increased, thereby effectively improving the anti-corrosion effect while properly controlling the spraying cost. That is, the coating thickness of the bottom surface insulating anti-corrosion coating at the edge of the liquid cooling plate 201 is defined as a (i.e., the coating thickness of region A is a), and the coating thickness of the bottom surface insulating anti-corrosion coating at the middle of the liquid cooling plate 201 is defined as b (i.e., the coating thickness of region B is a); then, a and b satisfy: a>b.

[0050] The width dimension d of the area A with a coating thickness of a depends on the size of the liquid cooling plate 201. Generally, d is between 50 mm and 250 mm. It can be understood that d is the minimum distance from the outer edge of area A to the outer edge of area B. By setting the width dimension d, it is avoided that d is too small to reduce the insulation effect, and it is also avoided that d is too large to increase the cost. Optionally, the width dimension d of area A is smaller than the width dimension of the box frame 1. Figure 2 As shown, the area A can be extended to the bottom of the box frame 1, thereby ensuring the insulation and anti-corrosion effect to the greatest extent possible.

[0051] Optionally, the surface of the liquid cooling plate 201 away from the bottom guard plate 202 is sprayed with a top insulating anti-corrosion coating, thereby providing anti-corrosion protection for the top surface of the liquid cooling plate 201. The thickness dimension c of the insulating anti-corrosion coating on the top surface can be equal to the coating thickness dimension b of area B, that is, c=b, at this time a>c=b; optionally, in order to improve economic benefits, b<c can be set.

[0052] In this embodiment, it is found through research that when the following spraying requirements are met, it can have good anti-corrosion performance and high economic benefits:

[0053] ①a is 0.06mm-0.35mm, b is 0.06mm-0.15mm, and c is 0.15mm±0.05mm. The above coating thickness range ensures that the coating can play a good anti-corrosion role without increasing the cost or affecting the heat dissipation performance of the liquid cooling plate 201 due to excessive thickness;

[0054] ② The color of the top surface insulation anti-corrosion coating and / or the bottom surface insulation anti-corrosion coating is black (RAL9005) or off-white (RAL7035);

[0055] ③ Insulation withstand voltage: Use a good conductor close to the actual size of the liquid cooling plate 201 for large-surface testing, insulation resistance ≥ 550mΩ, withstand voltage level < 1mA@1500VDC;

[0056] ④ Adhesion: ISO2409 adhesion test meets level 0;

[0057] ⑤ Flame retardant requirements: meet UL94-V0 grade requirements;

[0058] ⑥The surface is smooth, without any sag, scratches, or other defects;

[0059] ⑦ Welding joints, assembly holes, back edges and other areas that do not require spraying must be shielded as necessary;

[0060] ⑧ The insulation paint spraying area should be ≥30mN / m. Optional, see Figure 2 A supporting foam 204 for supporting the liquid cooling plate 201 is provided between the liquid cooling plate 201 and the bottom guard plate 202. The supporting foam 204 is a hard material, and the supporting foam 204 is provided to enhance the supporting and impact resistance of the liquid cooling plate 201, which is beneficial to protect the liquid cooling plate 201 from damage during transportation and use.

[0061] The side of the support foam 204 facing the liquid cooling plate 201 is sealed with the liquid cooling plate 201 to form a first sealing surface 2041, and the side of the support foam 204 away from the liquid cooling plate 201 is sealed with the bottom guard plate 202 to form a second sealing surface 2042. The first sealing surface 2041 is conformally conformed to the bottom surface of the liquid cooling plate 201, and the second sealing surface 2042 is conformally conformed to the top surface of the bottom guard plate 202, thereby further improving the overall sealing effect and preventing water vapor from contacting the bottom surface of the liquid cooling plate 201. At the same time, the support foam 204 is filled between the liquid cooling plate 201 and the bottom guard plate 202, reducing the space for accommodating water vapor and further improving the sealing effect.

[0062] Furthermore, an elastic portion 2021 is provided at the edge of the bottom guard plate 202 at a position corresponding to the first sealing surface 2041, and the end position of the elastic portion 2021 is used to elastically push the supporting foam 204, so that the first sealing surface 2041 is in close contact with the liquid cooling plate 201. The elastic portion 2021 can elastically push the supporting foam 204, so that the first sealing surface 2041 is in close contact with the liquid cooling plate 201, further improving the sealing performance, and preventing water vapor from entering along the gap between the supporting foam 204 and the bottom of the liquid cooling plate 201 and then contacting the bottom of the liquid cooling plate 201.

[0063] Optionally, the middle position of the elastic portion 2021 protrudes in a direction away from the liquid cooling plate 201 and forms a shrinkage space 2022 with the supporting foam 204, which is beneficial for resisting deformation when subjected to external pressure and improving impact resistance.

[0064] An inclined surface 2043 is provided at the edge of one side of the supporting foam 204 away from the liquid cooling plate 201, one end of the inclined surface 2043 is connected to the second sealing surface, and the other end abuts against the elastic part 2021 to form the shrinkage space 2022. The shrinkage space 2022 is formed by the inclined surface 2043 and the elastic part 2021 to ensure that there is sufficient space to resist deformation. Since the elastic part 2021 protrudes in the direction away from the liquid cooling plate 201, when impacted, it first contacts the external structure through the protruding structure, and then resists the external structure through the deformation of the shrinkage space 2022. After that, the supporting foam 204 can further resist the external structure to minimize the impact on the liquid cooling plate 201 and prevent the liquid cooling plate 201 from deformation and damage.

[0065] Furthermore, the inclined surface 2043 is arranged around the second sealing surface so that a collapse space 2022 is formed between the supporting foam 204 and the bottom guard plate 202, surrounding the bottom edges of the entire liquid cooling plate 201. This ensures that the liquid cooling plate 201 can be protected from external impacts on all sides, thereby ensuring the overall impact resistance of the liquid cooling plate 201.

[0066] The edge of the bottom guard plate 202 is also provided with a connection portion 2023, and a sealing ring 203 is provided between the connection portion 2023 and the liquid cooling plate 201. The connection portion 2023 is also used to connect and fix with the box frame 1, so that the sealing ring 203 is clamped by fixing to the box frame 1 to improve the sealing effect. Figure 2 As shown, the connection part 2023, the liquid cooling plate 201 and the bottom of the box frame 1 are all arranged in parallel to improve the connection stability and sealing. It should be noted that the sealing ring 203 is arranged on the outside of the supporting foam 204, that is, the first sealing surface 2041 is in contact with the liquid cooling plate 201, and the contact area between the two is on the inner side of the sealing ring 203, which serves the purpose of secondary protection and effectively reduces the risk of external water vapor entering. When the sealing ring 203 fails and the airtightness between the bottom guard plate 202 and the cold plate is poor, the first sealing surface 2041 is in contact with the liquid cooling plate 201, which can effectively isolate the intrusion of external water vapor.

[0067] It should be noted that when the width of the sealing ring 203 is small, resulting in poor sealing effect, a>c>b, so as to take into account the insulation effect of the top and bottom surfaces of the liquid cooling plate 201; when the width of the sealing ring 203 is large and can meet the sealing effect, c>a>b can be set, which is conducive to reducing costs and improving economic benefits.

[0068] Furthermore, a chamfered portion 2024 is connected between the connecting portion 2023 and the elastic portion 2021, and the chamfered portion 2024 protrudes in the direction close to the liquid cooling plate 201, so as to enclose a deformation space 205 through the supporting foam 204, the sealing ring 203, the liquid cooling plate 201, and the chamfered portion 2024. The deformation space 205 provides a deformation space for the supporting foam 204, and can ensure a certain structural strength. When the convex elastic portion 2021 is subjected to an external impact and the collapse space 2022 is deformed, causing the supporting foam 204 to deform, the supporting foam 204 can be deformed toward the deformation space 205, avoiding the deformation of the liquid cooling plate 201 due to direct squeezing of the liquid cooling plate 201 due to the lack of space, so that the force is more uniform, and the overall rigidity and strength are improved. At the same time, the chamfered portion 2024 can be used to elastically push the supporting foam 204, increase the support and constraint of the supporting foam 204, improve the strength of the edge of the supporting foam 204, and also prevent external water vapor from entering the collapse space 2022, further improve the sealing effect, and avoid the problem of sealing failure due to vibration and other reasons. The elastic portion 2021 can be formed by bending the bottom guard plate 202 toward the liquid cooling plate 201 to form a space for accommodating the supporting foam 204, and can cooperate with the inclined surface 2043 of the supporting foam 204 to form the collapse space 2022. Specifically, the two ends of the elastic portion 2021 can respectively abut the two ends of the inclined surface 2043 to ensure the uniformity of the force of the collapse space 2022 and improve the overall strength.

[0069] Optionally, the liquid cooling plate 201 includes an upper cooling plate 2011 and a lower cooling plate 2012. The lower cooling plate 2012 is provided with a flow channel region 2012a for cooperating with the upper cooling plate 2011 to surround and form a liquid flow channel 2012c, and a welding region 2012b for welding and fixing to the upper cooling plate 2011; at least the flow channel region 2012a is provided with the bottom surface insulating anti-corrosion coating.

[0070] There is no high-pressure cooling liquid in the welding area 2012b, so even if it is corroded, it will not cause the cooling liquid to leak. Therefore, in order to reduce the cost of spraying materials, the bottom surface insulation anti-corrosion coating can be sprayed only in the flow channel area 2012a.

[0071] Of course, in some other embodiments, the bottom insulating anti-corrosion coating may be sprayed on both the flow channel area 2012a and the welding area 2012b to simplify the spraying process and improve the spraying efficiency.

[0072] In summary, the anti-corrosion liquid cooling assembly 2 and battery pack provided in this embodiment have the following advantages:

[0073] ① The anti-corrosion performance is significantly improved: By spraying the bottom insulating anti-corrosion coating on the surface of the liquid cooling plate 201 close to the bottom guard plate 202, the corrosion of the liquid cooling plate 201 by external water vapor is effectively prevented, thereby improving the service life of the liquid cooling plate 201 and the overall safety of the battery pack;

[0074] ② Cost-effectiveness optimization: By increasing the coating thickness at the edge of the liquid cooling plate 201 and keeping a thinner coating in the middle, the stepped coating thickness design not only ensures the anti-corrosion effect but also avoids unnecessary cost increase;

[0075] ③ Enhanced support and impact resistance: The setting of the supporting foam 204 protects the safety of the liquid cooling plate 201 during transportation and use, and reduces the risk of damage;

[0076] ④ Improved sealing performance: The design of the first sealing surface 2041 and the second sealing surface 2042 provides secondary protection, effectively reducing the risk of external water vapor entering, and even if the sealing ring 203 fails, it can maintain good sealing performance;

[0077] ⑤ Elastic sealing design: The elastic part 2021 of the bottom guard plate 202 is designed to ensure that the first sealing surface 2041 is in close contact with the liquid cooling plate 201, thereby improving the sealing performance and preventing water vapor from intruding, and also to form a shrinkage space 2022, thereby enhancing the impact resistance and maintaining the sealing performance;

[0078] ⑥ Targeted anti-corrosion treatment: The bottom surface insulating anti-corrosion coating is sprayed only on the flow channel area 2012a of the liquid cooling plate 201, which not only ensures the anti-corrosion effect but also reduces the spraying cost.

[0079] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An anti-corrosion liquid cooling component, characterized in that: It comprises a liquid cooling plate (201) and a bottom guard plate (202) arranged opposite to the liquid cooling plate (201); Wherein, a bottom surface insulating anti-corrosion coating is sprayed on the surface of the liquid cooling plate (201) close to the bottom guard plate (202).

2. The anti-corrosion liquid cooling assembly according to claim 1, characterized in that: The coating thickness dimension of the insulating anti-corrosion coating on the bottom surface of the edge position of the liquid cooling plate (201) is a, and the coating thickness dimension of the insulating anti-corrosion coating on the bottom surface of the middle position of the liquid cooling plate (201) is b; a and b satisfy: a>b.

3. The anti-corrosion liquid cooling assembly according to claim 2, characterized in that: a is 0.06mm-0.35mm, b is 0.06mm-0.15mm.

4. The anti-corrosion liquid cooling assembly according to claim 1, characterized in that: A top surface insulating anti-corrosion coating is sprayed on a surface of the liquid cooling plate (201) away from the bottom guard plate (202); Wherein, the coating thickness dimension c of the top surface insulating anti-corrosion coating is 0.15mm±0.05mm.

5. The anti-corrosion liquid cooling assembly according to claim 1, characterized in that: A supporting foam (204) for supporting the liquid cooling plate (201) is provided between the liquid cooling plate (201) and the bottom guard plate (202); a side of the supporting foam (204) facing the liquid cooling plate (201) is sealed to the liquid cooling plate (201) to form a first sealing surface (2041); and a side of the supporting foam (204) away from the liquid cooling plate (201) is sealed to the bottom guard plate (202) to form a second sealing surface (2042).

6. The anti-corrosion liquid cooling assembly according to claim 5, characterized in that: An elastic portion (2021) is provided at the edge of the bottom guard plate (202), and a middle position of the elastic portion (2021) protrudes in a direction away from the liquid cooling plate (201) and forms a shrinkage space (2022) with the supporting foam (204).

7. The anti-corrosion liquid cooling assembly according to claim 6, characterized in that: An inclined surface (2043) is provided at the edge of a side surface of the supporting foam (204) away from the liquid cooling plate (201); one end of the inclined surface (2043) is connected to the second sealing surface (2042), and the other end abuts against the elastic portion (2021) to form the shrinkage space (2022).

8. The anti-corrosion liquid cooling assembly according to claim 7, characterized in that: A connecting portion (2023) is also provided at the edge of the bottom guard plate (202), and a sealing ring (203) is provided between the connecting portion (2023) and the liquid cooling plate (201); A chamfered portion (2024) is connected between the connecting portion (2023) and the elastic portion (2021), and the chamfered portion (2024) protrudes in a direction close to the liquid cooling plate (201), so as to enclose a deformation space (205) through the supporting foam (204), the sealing ring (203), the liquid cooling plate (201), and the chamfered portion (2024).

9. The anti-corrosion liquid cooling assembly according to claim 1, characterized in that: The liquid cooling plate (201) comprises an upper cooling plate (2011) and a lower cooling plate (2012). The lower cold plate (2012) is provided with a flow channel area (2012a) for cooperating with the upper cold plate (2011) to surround and form a liquid flow channel (2012c), and a welding area (2012b) for being welded and fixed to the upper cold plate (2011); At least the flow channel area (2012a) is provided with the bottom surface insulating anti-corrosion coating.

10. A battery pack, characterized in that: The invention comprises a box frame (1), an anti-corrosion liquid cooling assembly (2) as claimed in any one of claims 1 to 9 located at the bottom of the box frame (1), a box top cover (3) located at the top of the box frame (1), and electrical components located within the box frame (1).

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