Liquid cooling assembly and battery system

Abstract

The utility model relates to the technical field of batteries, in particular to a liquid cooling assembly and a battery system, the liquid cooling assembly comprises a liquid cooling plate provided with a cover plate and a flow channel plate, and the flow channel plate and the cover plate are buckled to form a liquid cooling flow channel; the coating is coated on the outer surface of the cover plate and / or the runner plate; the heat preservation coefficient of the coating is less than or equal to 0.04 W / (m.k); the corrosion resistance coefficient of the coating is acid / alkali resistant within 96 hours without performance degradation; the thickness of the coating ranges from 100 micrometers to 350 micrometers. The insulation coefficient of the coating is 4000 VDC, the duration time is 60 s, and the leakage current is smaller than or equal to 0.1 mA. After the liquid cooling plate is coated with the coating, the thickness of the liquid cooling plate ranges from 1 mm to 6 mm. According to the embodiment of the invention, the outer surface of the liquid cooling plate is coated with the coating, and the coating has insulating property and corrosion resistance at the same time, so that the insulating problem and the corrosion problem can be directly solved. And the thickness of the coating is obviously low, so that the space utilization rate in practical application can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a liquid cooling assembly and battery system. BACKGROUND

[0002] At present, the battery system for new energy automobile usually is provided with battery pack and liquid cooling plate, and the liquid cooling flow channel or liquid cooling pipe in the liquid cooling plate is closely arranged with the battery pack, so that the battery pack can be cooled by the liquid cooling plate.

[0003] However, the current cannot completely guarantee the sealing between the battery pack and the liquid cooling plate, which leads to the condensate water in the cold and hot environment, and the condensate water will be accumulated on the flow channel surface of the liquid cooling plate under the long time working condition, so that the condensate water causes corrosion on the surface of the liquid cooling plate, seriously affects the performance of the battery pack, and also increases the after-sales maintenance cost of the battery pack. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a liquid cooling assembly and battery system to solve the problem of corrosion of condensate water on the surface of the liquid cooling plate.

[0005] In a first aspect, the utility model provides a liquid cooling assembly, which comprises:

[0006] The liquid cooling plate is provided with a cover plate and a flow channel plate, and the flow channel plate and the cover plate are buckled to form a liquid cooling flow channel;

[0007] The coating is coated on the outer surface of the cover plate and / or the flow channel plate;

[0008] The thermal insulation coefficient of the coating is less than or equal to 0.04 W / (m.k); the corrosion resistance coefficient of the coating is 96h acid / alkali resistance without performance degradation; the thickness of the coating is between 100um and 350um; the insulation coefficient of the coating is 4000VDC, the duration is 60s, and the leakage current is less than or equal to 0.1mA; after the liquid cooling plate is coated with the coating, the thickness of the liquid cooling plate is between 1mm and 6mm.

[0009] Advantages:

[0010] In actual application process, because the upper part of the liquid cooling plate is usually in contact with the battery pack, although the outside of the battery pack is wrapped with a blue film for insulation protection, after the blue film is damaged, insulation problems will occur between the battery pack and the liquid cooling plate, thereby affecting the normal use of the battery pack. Or when the battery pack leaks, the electrolyte flowing out will cause certain corrosion to the liquid cooling plate. If a separate insulation layer and corrosion-resistant layer are directly arranged on the liquid cooling plate, it is inevitable to be limited by the overall volume of the liquid cooling plate, and the liquid cooling plate and the battery pack need to be installed at the bottom of the vehicle body, and the space reserved at the bottom of the vehicle body is relatively nervous, so if the overall volume of the liquid cooling plate is large, the space of other parts will be occupied, so the space utilization rate is low.

[0011] In the embodiment, by coating the coating on the outer surface of the liquid cooling plate, since the coating has insulation performance and corrosion resistance, the insulation problem and the corrosion problem can be directly solved. Compared with the separate insulation layer and the corrosion-resistant layer, the thickness of the coating is obviously lower, so the space utilization rate in actual application can be improved. Further, since the coating also has a certain heat preservation effect, the heat preservation cotton at the bottom of the liquid cooling plate can be further cancelled, so the space utilization rate can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the specific embodiment of the present application or related technology, the drawings needed to be used in the specific embodiment or related technology description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0013] Fig. 1 An explosion schematic view of a liquid cooling assembly according to an embodiment of the present application;

[0014] Fig. 2 A structure schematic view of a flow channel plate according to an embodiment of the present application.

[0015] Explanation of reference signs:

[0016] 1, liquid cooling plate; 11, cover plate; 12, flow channel plate; 2, coating; 21, first coating; 22, second coating. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside, it can be wireless connection, or it can be wired connection. For ordinary workers in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0020] In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0021] At present, the battery system used in new energy vehicles is usually provided with a battery pack and a liquid cooling plate 1, and the liquid cooling flow channel or liquid cooling pipe in the liquid cooling plate 1 is arranged close to the battery pack, so that the battery pack can be cooled by the liquid cooling plate 1.

[0022] However, at present, the sealing between the battery pack and the liquid cooling plate 1 cannot be completely guaranteed, which leads to the generation of condensed water in cold and hot environments. Under the working condition for a long time, the condensed water will be accumulated on the flow channel surface of the liquid cooling plate 1, so that the condensed water corrodes the surface of the liquid cooling plate 1, seriously affects the performance of the battery pack, and also increases the after-sales maintenance cost of the battery pack.

[0023] Meanwhile, in the actual application process, since the upper side of the liquid cooling plate 1 is usually in contact with the battery pack, although the outside of the battery pack is wrapped with a blue film for insulation protection, after the blue film is damaged, insulation problems will occur between the battery pack and the liquid cooling plate 1, thereby affecting the normal use of the battery pack. Or when the battery pack leaks, the electrolyte flowing out will cause certain corrosion to the liquid cooling plate 1. If a separate insulation layer and anti-corrosion layer are directly arranged on the liquid cooling plate 1, it is inevitable to be limited by the overall volume of the liquid cooling plate 1. And the liquid cooling plate 1 and the battery pack need to be installed at the bottom of the vehicle body, and the space reserved at the bottom of the vehicle body is relatively nervous, so if the overall volume of the liquid cooling plate 1 is large, the space of other parts will be occupied, so the space utilization rate is low.

[0024] In addition, since the upper and lower surfaces of the liquid cooling plate 1 are in contact with the external environment, they are greatly affected by the environment, although the outside of the liquid cooling plate 1 is wrapped with thermal insulation cotton, the thermal insulation cotton has a certain thickness, which also affects the utilization of space, and even affects the installation of the bottom guard plate of the vehicle body. In extreme conditions, the bottom guard plate may even be cancelled, thereby reducing the protection of the liquid cooling plate 1 and the battery pack, which is not conducive to the use of users.

[0025] The embodiments of the present application will be described below in combination with Figs. 1-2 The embodiments of the present application will be described below in combination with

[0026] According to the embodiments of the present application, on the one hand, a liquid cooling assembly is provided, which comprises a liquid cooling plate 1 and a coating 2.

[0027] Specifically, in the present embodiment, the liquid cooling plate 1 is provided with a cover plate 11 and a flow channel plate 12, and a flow channel for flowing liquid cooling medium is formed on the flow channel plate 12. After the flow channel plate 12 is buckled with the cover plate 11, the flow channel and the cover plate 11 form a liquid cooling flow channel.

[0028] Further, in the present embodiment, the coating 2 is coated on the outer surfaces of the cover plate 11 and the flow channel plate 12. Of course, those skilled in the art can coat only the outer surface of the cover plate 11 or the outer surface of the flow channel plate 12 according to the actual situation, and the present embodiment is only an example and can achieve the same technical effect.

[0029] Further, in the present embodiment, the thermal insulation coefficient of the coating 2 is ≤0.04 W / (m.k). In this way, when the thickness of the coating 2 is 1mm to 1.5mm, the thermal insulation performance of the coating 2 is at least equivalent to 2 to 3 times the thermal insulation and anti-condensation performance of ordinary thermal insulation cotton, so the thermal insulation requirement can be met.

[0030] Further, in the embodiment, the corrosion resistance coefficient of the coating 2 is acid / alkali resistance 96h without performance degradation. When the total thickness of the coating 2 is 1.5mm, the coating 2 can keep normal work for more than 3000 hours in the actual working condition of seawater corrosion cold plate in the environment of 85% relative humidity and temperature 85℃. At the same time, the salt spray resistance is more than 4000 hours.

[0031] Further, in the embodiment, the thickness of the coating 2 is between 100um and 350um.

[0032] Further, in the embodiment, the insulation coefficient of the coating 2 is 4000VDC, the duration is 60s, and the leakage current is less than or equal to 0.1mA; the insulation performance and voltage resistance performance can be met, and the leakage current is less than or equal to 0.1mA under the environment of 4000V direct current voltage.

[0033] It should be noted that in the embodiment, the specific material composition of the coating 2 is not limited, and the coating 2 commonly used in the market or in the currently disclosed patents can be used. Of course, layers of materials with different functions can also be coated in sequence, so that the coating coated on the liquid cooling plate 1 has the above parameter conditions.

[0034] For example, the coating 2 is composed of an insulation layer, a thermal insulation layer, and a corrosion resistant layer. From the inside to the outside, the first layer can be coated with an insulation layer, the second layer can be coated with a thermal insulation layer, and the third layer can be coated with a corrosion resistant layer, so that the coating 2 coated on the liquid cooling plate 1 has the above parameter conditions.

[0035] Of course, the embodiment only exemplifies the specific composition of the coating 2, but does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0036] Further, in the embodiment, the thickness of the liquid cooling plate 1 after coating the coating 2 is between 1mm and 6mm. Therefore, the volume of the liquid cooling plate 1 will not be significantly increased, and when the liquid cooling plate 1 is installed on the vehicle body, the space occupied by the current thermal insulation layer material, insulation layer material, and corrosion resistant material can be greatly saved, thereby improving the space utilization in actual application.

[0037] In the embodiment, the coating 2 is coated on the outer surface of the liquid cooling plate 1. Since the coating 2 has insulation performance and corrosion resistance performance, the insulation problem and corrosion problem can be solved directly. Compared with a single insulation layer and a corrosion resistant layer, the thickness of the coating 2 is obviously lower, thereby improving the space utilization in actual application. Further, since the coating 2 also has a certain thermal insulation effect, the thermal insulation cotton at the bottom of the liquid cooling plate 1 can be further cancelled, thereby further improving the space utilization.

[0038] Further, in an optional embodiment, the total thickness of the coating 2 is defined as A, and the thickness of the liquid cooling plate 1 is defined as B, and the value of A / B is between 0.06 and 2.3.

[0039] In this way, the appropriate thickness of the coating 2 can provide good heat preservation effect, insulation effect and corrosion resistance effect. If the coating 2 is too thin, the heat preservation effect, insulation effect and corrosion resistance effect will not be obvious. If the coating 2 is too thick, it may affect the overall volume of the liquid cooling assembly, thereby affecting the space utilization, and may also affect the heat dissipation performance of the liquid cooling assembly. Within the ratio range of 0.06 to 2.3, the best performance balance of the coating 2 can be achieved, and the heat dissipation performance of the liquid cooling assembly will not be affected.

[0040] Further, in an optional embodiment, the total thickness of the battery pack is defined as C, and the value of B / C is between 0.008 and 0.05.

[0041] In this way, the overall space occupied by the coating 2 in the battery pack can be ensured to be not too large, and the internal space of the battery pack can be saved. At the same time that the coating 2 achieves the same performance, the thinner thickness of the coating 2 can significantly improve the space utilization inside the battery pack.

[0042] Further, in an optional embodiment, the coating 2 comprises a first coating 21 and a second coating 22.

[0043] Specifically, the first coating 21 is coated on the outer surface of the cover plate 11, and the second coating 22 is coated on the outer surface of the flow channel plate 12.

[0044] The thickness of the first coating 21 is A1, and A1 is between 200um and 300um. The thickness of the second coating 22 is A2, and A2 is between 1mm and 1.5mm. The value of A1 / A2 is between 0.04 and 3.

[0045] Further, in an optional embodiment, the coating 2 comprises at least an epoxy system material, a foaming system material, and a ceramic aerogel type.

[0046] Further, in an optional embodiment, the liquid cooling assembly further comprises a buffer, and the buffer is wrapped on the outer surface of the liquid cooling plate 1.

[0047] In this way, in actual use, the buffer can isolate the liquid cooling plate 1 from the outside world, so that the buffer not only provides certain protection for the liquid cooling plate 1, but also further provides heat preservation for the liquid cooling plate 1.

[0048] Further, in an alternative embodiment, the buffer is a foam. Of course, the present embodiment is merely an example of a specific type of buffer, but is not limited thereto, and those skilled in the art can change the type of buffer according to actual conditions, as long as the same technical effects can be achieved.

[0049] Further, in an alternative embodiment, the flow channel plate 12 is formed with a recessed surface, and the foam is provided with a protruding portion adapted to be embedded in the recessed surface on the end surface close to the flow channel plate 12, so that the foam is attached to the flow channel plate 12.

[0050] In this way, by embedding the protruding portion of the foam into the recessed surface of the flow channel plate 12, the sealing effect between the two can be significantly improved. Such close attachment can effectively prevent the condensate from accumulating on the flow channel surface of the flow channel plate 12, avoiding corrosion of the surface of the liquid cooling plate 1 by the condensate. Moreover, the cooperation of the protruding portion and the recessed surface can increase the contact area between the foam and the flow channel plate 12, thereby improving the stability and firmness of the overall structure. This helps to reduce loosening or falling caused by vibration or external force during the vehicle form process. At the same time, the foam has good sound absorption and shock absorption performance. By close attachment, the noise and vibration generated by the flow channel plate 12 during operation can be effectively absorbed and attenuated, improving the smoothness of the operation of the liquid cooling plate 1.

[0051] In a second aspect, the utility model also provides a battery system, the battery system includes: battery assembly and the liquid cooling assembly as any above-mentioned embodiment.

[0052] Although the embodiments of the utility model have been described in conjunction with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A liquid-cooled assembly, comprising: The application relates to a liquid cooling assembly. The liquid cooling assembly comprises: a liquid cooling plate (1) provided with a cover plate (11) and a flow channel plate (12), which form a liquid cooling flow channel after being buckled with each other; a coating (2) coated on the outer surface of the cover plate (11) and / or the flow channel plate (12); 2. The liquid-cooling assembly of claim 1, wherein, the thermal conductivity of the coating is less than or equal to 0.04 W / (m.k); the corrosion resistance of the coating is 96h acid / alkali resistance without performance degradation; the thickness of the coating is between 100um and 350um; the insulation coefficient of the coating is 4000VDC, the duration is 60s, and the leakage current is less than or equal to 0.1mA; and the thickness of the liquid cooling plate is between 1mm and 6mm after the coating is coated.

3. The liquid-cooling assembly of claim 2, wherein, The total thickness of the coating (2) is defined as A, the thickness of the liquid cooling plate (1) is defined as B, and the value of A / B is between 0.06 and 2.

3.

4. The liquid cooling assembly of any one of claims 1 to 3, wherein, The total thickness of the battery pack is defined as C, and the value of B / C is between 0.008 and 0.

05. The coating (2) comprises: a first coating (21) coated on the outer surface of the cover plate (11); a second coating (22) coated on the outer surface of the flow channel plate (12); 5. The liquid cooling assembly of claim 4, wherein, the thickness of the first coating (21) is A1, the thickness of the second coating (22) is A2, and the value of A1 / A2 is between 0.04 and 3.

6. The liquid cooling assembly of any one of claims 1 to 3, wherein, A1 is between 80um and 300um, and A2 is between 0.1mm and 2mm.

7. The liquid cooling assembly of any of claims 1 to 3, wherein, The coating (2) at least comprises an epoxy system material, a foaming system material and a ceramic aerogel type material. The liquid cooling assembly further comprises:

8. The liquid cooling assembly of claim 7, wherein, a buffer member wrapped on the outer surface of the liquid cooling plate (1).

9. The liquid cooling assembly of claim 8, wherein, The buffer member is a foam.

10. A battery system characterized by, The flow channel plate (12) is provided with a recessed surface, and the foam is provided with a protruding part suitable for being embedded in the recessed surface on the end surface close to the flow channel plate (12), so that the foam is attached to the flow channel plate (12). The application also relates to a battery assembly and the liquid cooling assembly as claimed in any one of claims 1 to 9.

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