Anticorrosive liquid cooling assembly and battery pack

Abstract

The application relates to the technical field of electric energy storage, and particularly discloses a corrosion-proof liquid cooling assembly and a battery pack. The corrosion-proof liquid cooling assembly comprises a liquid cooling plate and a bottom guard plate arranged opposite to the liquid cooling plate; wherein the surface of the liquid cooling plate close to the bottom guard plate is sprayed with a bottom surface insulation corrosion-proof coating. The corrosion-proof liquid cooling assembly and the battery pack can effectively solve the problem that the liquid cooling plate is easily corroded after the air tightness between the liquid cooling plate and the bottom guard plate decreases.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a corrosion-resistant liquid cooling component and battery pack. Background Technology

[0002] Battery packs typically include:

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

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

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

[0006] Liquid cooling plates are common heat exchange components in batteries, typically formed by welding together an upper cooling plate and a lower cooling plate. A liquid flow channel is provided between the upper and lower cooling plates; by introducing a cooling liquid (such as water, ethylene glycol aqueous solution, or other coolants) into the channel, the heat released by the battery cell can be effectively absorbed and transferred.

[0007] To prevent external moisture from corroding the bottom surface of the liquid cooling plate, sealing rings are typically installed at the edges of both the liquid cooling plate and the bottom guard plate. However, over time, these sealing rings can age, reducing the airtightness between the liquid cooling plate and the bottom guard plate. Alternatively, vibrations from vehicle movement can cause fasteners to loosen, further reducing the airtightness between the liquid cooling plate and the bottom guard plate. In such cases, external moisture can enter the space between the liquid cooling plate and the bottom guard plate, eventually corroding the liquid cooling plate.

[0008] If corrosion occurs in the liquid flow channel, the high-pressure coolant is prone to leakage, which may cause internal short circuits in the battery or even explosions and other safety accidents.

[0009] Therefore, existing battery packs need to be improved to address the issue of corrosion of the liquid cooling plate due to decreased airtightness between the liquid cooling plate and the bottom protective plate.

[0010] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0011] One objective of this invention is to provide a corrosion-resistant liquid cooling component and battery pack, which can effectively solve the problem that the liquid cooling plate is easily corroded after the airtightness between the liquid cooling plate and the bottom protective plate decreases.

[0012] To achieve the above objectives, on the one hand, the present invention provides a corrosion-resistant liquid cooling assembly, including a liquid cooling plate and a bottom protective plate disposed opposite to the liquid cooling plate;

[0013] The surface of the liquid cooling plate near the bottom protective plate is coated with a bottom insulating and anti-corrosion coating.

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

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

[0016] Optionally, the surface of the liquid cooling plate away from the bottom protective plate is coated with a top insulating and anti-corrosion coating;

[0017] The thickness c of the top insulating and anti-corrosion coating is 0.15mm ± 0.05mm.

[0018] Optionally, a support foam for supporting the liquid cooling plate is provided between the liquid cooling plate and the bottom protective plate. The side of the support foam facing the liquid cooling plate is fitted and sealed with the liquid cooling plate to form a first sealing surface, and the side of the support foam away from the liquid cooling plate is fitted and sealed with the bottom protective plate to form a second sealing surface.

[0019] Optionally, the bottom guard plate has an elastic part at its edge, and the middle part of the elastic part protrudes away from the liquid cooling plate, forming a shrinkage space with the supporting foam.

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

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

[0022] A chamfered portion is connected between the connecting portion and the elastic portion. The chamfered portion protrudes towards the liquid cooling plate to form a deformation space by being 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 area is provided with the bottom surface insulating and anti-corrosion coating.

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

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

[0028] The beneficial effects of this invention are as follows: It provides a corrosion-resistant liquid cooling component and battery pack. When the airtightness between the liquid cooling plate and the bottom protective plate decreases, causing external moisture to enter between the liquid cooling plate and the bottom protective plate, the liquid cooling plate is coated with a bottom insulating and corrosion-resistant coating on the surface near the bottom protective plate. Therefore, the external moisture cannot directly corrode the liquid cooling plate, thus solving the problem that the liquid cooling plate is easily corroded after the airtightness between the liquid cooling plate and the bottom protective plate decreases. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 An exploded view of the battery pack provided in the embodiment;

[0031] Figure 2 A cross-sectional schematic diagram of the battery pack provided for an embodiment;

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

[0033] In the picture:

[0034] 1. Box frame;

[0035] 2. Corrosion-resistant liquid cooling assembly; 201. Liquid cooling plate; 2011. Upper cooling plate; 2012. Lower cooling plate; 2012a. Flow channel area; 2012b. Welding area; 2012c. Liquid flow channel; 202. Bottom protective plate; 2021. Elastic part; 2022. Feeding 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 Implementation

[0037] In this invention, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the invention. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this invention, as long as there is no technical contradiction or conflict, the 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 meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0039] In the description of this invention, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0040] In this invention, terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0041] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0042] Similar to the understanding in the Examination Guidelines, in this invention, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this invention, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0043] In the description of the embodiments of the present invention, the spatial related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of the present invention or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0044] Unless otherwise explicitly stated or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this invention, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; 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 components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances.

[0045] This invention provides a corrosion-resistant liquid cooling component and battery pack, which is suitable for battery systems that require high corrosion resistance and reliable heat dissipation. It can effectively solve the problem that the liquid cooling plate is easily corroded after the airtightness between the liquid cooling plate and the bottom protective plate decreases.

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

[0047] In this embodiment, the anti-corrosion liquid cooling assembly 2 includes a bottom protective plate 202 fastened to the bottom of the housing frame 1, a liquid cooling plate 201 disposed opposite to and above the bottom protective plate 202, and a sealing ring 203 located at the edges of both the liquid cooling plate 201 and the bottom protective plate 202. The surface of the liquid cooling plate 201 near the bottom protective plate 202 is coated with a bottom insulating and anti-corrosion coating.

[0048] The anti-corrosion liquid cooling component 2 and battery pack provided in this embodiment can prevent external moisture from directly corroding the liquid cooling plate 201 when the airtightness between the liquid cooling plate 201 and the bottom protective plate 202 decreases. This is because the surface of the liquid cooling plate 201 near the bottom protective plate 202 is sprayed with a bottom insulating anti-corrosion coating.

[0049] The erosion by external moisture gradually spreads from the edge of the liquid cooling plate 201 towards the center. Therefore, see... Figure 3 This can increase the coating thickness of the bottom insulating and anti-corrosion coating at the edge of the liquid cooling plate 201, thereby effectively improving the anti-corrosion effect while appropriately controlling the spraying cost. Specifically, let the coating thickness of the bottom insulating and anti-corrosion coating at the edge of the liquid cooling plate 201 be denoted as a (i.e., the coating thickness of region A is a), and the coating thickness of the bottom insulating and anti-corrosion coating at the middle position of the liquid cooling plate 201 be denoted as b (i.e., the coating thickness of region B is b); then a and b satisfy: a > b.

[0050] The width d of region A, where the coating thickness is 'a', depends on the size of the liquid cooling plate 201, and is generally between 50mm and 250mm. It can be understood that d represents the minimum distance between the outer edge of region A and the outer edge of region B. By setting the width d, we avoid both d being too small, which would reduce the insulation effect, and d being too large, which would increase costs. Optionally, the width d of region A can be smaller than the width of the enclosure frame 1, as shown in the reference. Figure 2 As shown, this allows region A to extend to the bottom of the box frame 1, maximizing the insulation and corrosion protection effect.

[0051] Optionally, the surface of the liquid cooling plate 201 away from the bottom protective plate 202 is coated with a top insulating and anti-corrosion coating, thereby providing anti-corrosion protection for the top surface of the liquid cooling plate 201. The thickness c of the top insulating and anti-corrosion coating can be equal to the coating thickness b of region B, i.e., c=b, where a>c=b; optionally, to improve economic efficiency, b<c can be set.

[0052] In this embodiment, research has shown that when the following spraying requirements are met, both good anti-corrosion performance and high economic benefits can be achieved:

[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] ②The top insulating and anti-corrosion coating and / or the bottom insulating and anti-corrosion coating are black (RAL9005) or off-white (RAL7035) products;

[0055] ③ Insulation withstand voltage: A good conductor with a size close to that of the liquid cooling plate 201 is used for large-area testing. The insulation resistance is ≥550mΩ and the withstand voltage rating is <1mA@1500VDC.

[0056] ④ Adhesion: The adhesion test meets level 0 of ISO 2409 adhesion test.

[0057] ⑤ Flame retardant requirements: Meet UL94-V0 level requirements;

[0058] ⑥ The surface is smooth and free from defects such as drips, scratches, and abrasions;

[0059] ⑦ Welded joints, assembly holes, and the surrounding area on the back, etc., which do not require painting, should be masked as necessary;

[0060] ⑧ The surface energy requirement for the area coated with insulating varnish is ≥30mN / m. (Optional, see below) Figure 2 A support foam 204 for supporting the liquid cooling plate 201 is provided between the liquid cooling plate 201 and the bottom protective plate 202. The support foam 204 is made of rigid material. The support foam 204 enhances the support and impact resistance of the liquid cooling plate 201, which helps to protect the liquid cooling plate 201 from damage during transportation and use.

[0061] The supporting foam 204 has one side facing the liquid cooling plate 201, which is sealed to form a first sealing surface 2041. The other side of the supporting foam 204 away from the liquid cooling plate 201 is sealed to form a second sealing surface 2042 with the bottom protective plate 202. The first sealing surface 2041 conforms to the bottom surface of the liquid cooling plate 201, and the second sealing surface 2042 conforms to the top surface of the bottom protective plate 202, thereby further improving the overall sealing effect and preventing moisture from contacting the bottom surface of the liquid cooling plate 201. Simultaneously, the supporting foam 204 fills the space between the liquid cooling plate 201 and the bottom protective plate 202, reducing the space for moisture retention and further improving the sealing effect.

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

[0063] Optionally, the middle position of the elastic part 2021 protrudes away from the liquid cooling plate 201 and forms a shrinkage space 2022 with the supporting foam 204, which helps to resist deformation when subjected to external pressure and improves impact resistance.

[0064] The supporting foam 204 has an inclined surface 2043 on its edge 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 collapsible space 2022. The collapsible space 2022 is formed by the inclined surface 2043 and the elastic part 2021 to ensure sufficient space to resist deformation. Since the elastic part 2021 protrudes away from the liquid cooling plate 201, when impacted, it first contacts the external structure through the protruding structure, then resists the external structure through the deformation of the collapsible space 2022, and then can further resist the external structure through the supporting foam 204, so as to minimize the impact on the liquid cooling plate 201 and prevent the liquid cooling plate 201 from deforming and being damaged.

[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, which surrounds the bottom perimeter of the entire liquid cooling plate 201. This ensures that the liquid cooling plate 201 can resist external impacts from all sides, thus ensuring the overall impact resistance of the liquid cooling plate 201.

[0066] The bottom protective plate 202 is further provided with a connecting portion 2023 at its edge, and a sealing ring 203 is provided between the connecting portion 2023 and the liquid cooling plate 201. The connecting portion 2023 is also used to connect and fix to the frame 1 of the housing, thereby clamping the sealing ring 203 by fixing it to the frame 1 of the housing, thus improving the sealing effect. (Reference) Figure 2 As shown, the bottom of the connecting part 2023, the liquid cooling plate 201, and the frame 1 of the housing are all arranged parallel to each other to improve connection stability and sealing. It should be noted that the sealing ring 203 is located on the outside of the supporting foam 204, meaning the first sealing surface 2041 is in contact with the liquid cooling plate 201, and the contact area between the two is inside the sealing ring 203, serving as secondary protection and effectively reducing the risk of external moisture ingress. When the sealing ring 203 fails, resulting in poor airtightness between the bottom protective plate 202 and the cooling plate, the first sealing surface 2041, in contact with the liquid cooling plate 201, can effectively prevent external moisture intrusion.

[0067] It should be noted that when the width of the sealing ring 203 is small, resulting in poor sealing effect, a > c > b, in order to balance 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 enough to meet the sealing effect, c > a > b can be set, which is conducive to reducing costs and improving economic efficiency.

[0068] Furthermore, a chamfered portion 2024 is connected between the connecting portion 2023 and the elastic portion 2021. The chamfered portion 2024 protrudes towards the liquid cooling plate 201, forming a deformation space 205 through the support foam 204, the sealing ring 203, the liquid cooling plate 201, and the chamfered portion 2024. The deformation space 205 provides deformation space for the support foam 204 while ensuring a certain structural strength. When the outwardly protruding elastic portion 2021 is subjected to external impact, causing the collapse space 2022 to deform, the support foam 204 deforms towards the deformation space 205. This avoids direct compression of the liquid cooling plate 201 due to lack of space, which would cause deformation of the liquid cooling plate 201. This results in more uniform stress distribution and improves overall rigidity and strength. Meanwhile, the chamfered portion 2024 can be used to elastically push against the support foam 204, increasing the support and constraint of the support foam 204, improving the strength of the edge of the support foam 204, and also preventing external moisture from entering the collapse space 2022, further improving the sealing effect and avoiding the problem of seal failure due to vibration or other reasons. The elastic portion 2021 can be formed by bending the bottom guard plate 202 towards the liquid cooling plate 201 to form a space to accommodate the support foam 204, and can also cooperate with the inclined surface 2043 of the support foam 204 to form the collapse space 2022. Specifically, the two ends of the elastic portion 2021 can respectively abut against the two ends of the inclined surface 2043 to ensure the uniformity of force distribution in 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 has a flow channel region 2012a that cooperates 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 has the bottom surface insulating and anti-corrosion coating.

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

[0071] Of course, in some other embodiments, an insulating and anti-corrosion coating can also 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 corrosion-resistant liquid cooling component 2 and battery pack provided in this embodiment have the following advantages:

[0073] ① Significantly improved corrosion resistance: By spraying an insulating anti-corrosion coating on the surface of the liquid cooling plate 201 near the bottom protective plate 202, the corrosion of the liquid cooling plate 201 by external moisture 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 maintaining a thinner coating in the middle, the stepped coating thickness design ensures the anti-corrosion effect while avoiding unnecessary cost increases.

[0075] ③ Enhanced support and impact resistance: The support foam 204 protects the liquid cooling plate 201 during transportation and use, reducing 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 moisture entering. Even if the sealing ring 203 fails, it can still maintain good sealing performance.

[0077] ⑤ Elastic sealing design: The elastic part 2021 of the bottom guard plate 202 can ensure that the first sealing surface 2041 is in close contact with the liquid cooling plate 201, which improves the sealing performance and prevents water vapor from entering. It can also form a shrinkage space 2022, which enhances the impact resistance and maintains the sealing performance.

[0078] ⑥ Targeted anti-corrosion treatment: The bottom insulating anti-corrosion coating is only sprayed 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 text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A battery pack, comprising a housing frame (1) and a corrosion-resistant liquid-cooling assembly (2) located at the bottom of the housing frame (1), characterized in that, The corrosion-resistant liquid cooling assembly includes a liquid cooling plate (201) and a bottom protective plate (202) disposed opposite to the liquid cooling plate (201). The liquid cooling plate (201) near the bottom protective plate (202) is coated with a bottom insulating and anti-corrosion coating. The bottom guard plate (202) is also provided with a connecting part (2023) at the edge position, and a sealing ring (203) is provided between the connecting part (2023) and the liquid cooling plate (201); the bottom guard plate (202) is used to connect and fix to the box frame (1), thereby clamping the sealing ring (203) by fixing it to the box frame (1). The thickness of the bottom insulating and anti-corrosion coating at the edge of the liquid cooling plate (201) is a, and the thickness of the bottom insulating and anti-corrosion coating at the middle position of the liquid cooling plate (201) is b; a and b satisfy: a>b; the width d of the region A with the coating thickness a is smaller than the width of the box frame (1), so that the region A extends to the bottom of the box frame (1).

2. The battery pack according to claim 1, characterized in that, a is 0.06mm-0.35mm, and b is 0.06mm-0.15mm.

3. The battery pack according to claim 1, characterized in that, The surface of the liquid cooling plate (201) away from the bottom protective plate (202) is coated with a top surface insulating and anti-corrosion coating; The thickness c of the top insulating and anti-corrosion coating is 0.15mm ± 0.05mm.

4. The battery pack according to claim 1, characterized in that, A support foam (204) for supporting the liquid cooling plate (201) is provided between the liquid cooling plate (201) and the bottom guard plate (202). The side of the support foam (204) facing the liquid cooling plate (201) is fitted and sealed with the liquid cooling plate (201) to form a first sealing surface (2041). The side of the support foam (204) away from the liquid cooling plate (201) is fitted and sealed with the bottom guard plate (202) to form a second sealing surface (2042).

5. The battery pack according to claim 4, characterized in that, The bottom guard plate (202) has an elastic part (2021) at the edge. The middle part (2021) protrudes away from the liquid cooling plate (201) and forms a shrinkage space (2022) with the support foam (204).

6. The battery pack according to claim 5, characterized in that, The supporting foam (204) has an inclined surface (2043) on the edge of the side 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 part (2021) to form the feed space (2022).

7. The battery pack according to claim 6, characterized in that, A chamfered portion (2024) is connected between the connecting portion (2023) and the elastic portion (2021). The chamfered portion (2024) protrudes towards the liquid cooling plate (201) to form a deformation space (205) by the support foam (204), the sealing ring (203), the liquid cooling plate (201), and the chamfered portion (2024).

8. The battery pack according to claim 1, characterized in that, The liquid cooling plate (201) includes 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 welding and fixing with the upper cold plate (2011). At least the flow channel region (2012a) is provided with the bottom surface insulating and anti-corrosion coating.

9. The battery pack according to any one of claims 1 to 8, characterized in that, It also includes a top cover (3) of the housing located at the top of the housing frame (1), and electrical components located within the housing frame (1).

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