Battery box and battery pack

Abstract

The utility model relates to battery technology field discloses a battery box and battery package, including fender, liquid cooling structure, seal ring and box, the box includes box body, first connecting part and second connecting part, and the box body is equipped with the accommodating cavity for accommodating battery and the open end communication with the accommodating cavity, and the first connecting part and second connecting part are connected with the box body and are adjacent to the open end of box body, and the second connecting part surrounds the accommodating cavity and presents the ring structure, and the first connecting part is located the side of second connecting part facing the accommodating cavity, and the liquid cooling structure edge at least part is opposite the first connecting part and is fixedly connected with the first connecting part, and the fender is located the side of liquid cooling structure away from the box, and the fender edge is opposite the second connecting part, and the seal ring is located between the second connecting part and fender, and the second connecting part is fixedly connected with fender to resist the seal ring, and the liquid cooling structure is located the ring of seal ring inside. The utility model can prevent the liquid cooling structure from contacting the water vapor in the external environment and from corroding, and improves the service life of liquid cooling structure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery box and battery pack. Background Technology

[0002] With the rapid development of new energy vehicles, the number of new energy vehicles on the road has increased dramatically. Simultaneously, a large number of new energy vehicles are exported from China to overseas markets, forcing them to face various extreme environments. In recent years, problems unforeseen in the early development of new energy vehicles have gradually surfaced, such as battery pack corrosion, particularly the corrosion of the internal liquid cooling plates. Due to limitations in the early anti-corrosion design of liquid cooling plates, the corrosion resistance of the material itself was relied upon without the addition of other anti-corrosion materials or special designs. However, according to current market feedback, the corrosion resistance of the material itself is insufficient to meet the corrosion resistance requirements under extreme environments. When the liquid cooling plate corrodes, it can lead to a decline in the thermal management performance of the battery pack or leakage of the liquid cooling plate. This can cause internal short circuits in the battery, or even explosions and other safety accidents. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a battery box and battery pack that can improve the corrosion resistance of the liquid cooling structure of the battery box and the service life of the battery pack.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, a battery box is provided, including a protective plate, a liquid cooling structure, a sealing ring, and a box body. The box body includes a box body, a first connecting portion, and a second connecting portion. The box body has a receiving cavity for accommodating a battery and an open end communicating with the receiving cavity. The first connecting portion and the second connecting portion are connected to the box body and adjacent to the open end of the box body. The second connecting portion surrounds the receiving cavity in a ring-shaped structure. The first connecting portion is located on the side of the second connecting portion facing the receiving cavity. The edge of the liquid cooling structure is at least partially opposite to the first connecting portion and is fixedly connected to the first connecting portion. The protective plate is located on the side of the liquid cooling structure away from the box body. The edge of the protective plate is opposite to the second connecting portion. The sealing ring is located between the edge of the second connecting portion and the protective plate. The second connecting portion is fixedly connected to the protective plate to abut against the sealing ring. The liquid cooling structure is located inside the ring of the sealing ring.

[0006] As a further embodiment of the battery box, a fastener is also included, wherein the edge of the protective plate is fixedly connected to the second connecting portion by the fastener.

[0007] As a further embodiment of the battery box, the fastener includes a plurality of bolts that pass through the protective plate, the sealing ring, and are threadedly connected to the second connection portion.

[0008] As a further embodiment of the battery box, the first connecting part has a ring-shaped structure and is welded to the edge of the liquid cooling structure.

[0009] As a further embodiment of the battery box, the second connecting part is fixedly connected to the end of the box body, the first connecting part protrudes from the inside of the box body and is adjacent to the second connecting part, and the edge of the liquid cooling structure is located between the first connecting part and the protective plate.

[0010] As a further embodiment of the battery box, the liquid cooling structure includes a liquid cooling plate, a first insulating and anti-corrosion layer, and a second insulating and anti-corrosion layer. The first insulating and anti-corrosion layer is located on the side of the liquid cooling plate away from the protective plate, and the second insulating and anti-corrosion layer is located on the side of the liquid cooling plate facing the protective plate.

[0011] As a further embodiment of the battery box, the thickness of the first insulating and anti-corrosion layer is greater than the thickness of the second insulating and anti-corrosion layer.

[0012] As a further embodiment of the battery box, the thickness of the first insulating and anti-corrosion layer is not less than 0.2 mm; and / or,

[0013] The thickness of the second insulating and anti-corrosion layer is not less than 0.1 mm.

[0014] As a further embodiment of the battery box, the liquid cooling plate has a first side and a second side facing away from each other along its thickness direction, the second side facing the protective plate, the first side having a first edge region and a first non-edge region other than the first edge region, the second side having a second edge region and a second non-edge region other than the second edge region, the first edge region facing the first connecting portion and welded to the first connecting portion, the first insulating and anti-corrosion layer covering the first non-edge region; the second insulating and anti-corrosion layer includes a sprayed layer and a roller brush layer, the sprayed layer covering the second non-edge region, and the roller brush layer covering the second edge region.

[0015] As a further embodiment of the battery box, the liquid cooling plate includes a flat plate and a flow channel plate. The flow channel plate is fixed to the side of the flat plate away from the box body. The first insulating and anti-corrosion layer is located on the side of the flat plate away from the flow channel plate. The edge of the flat plate is welded to the first connecting part. The second insulating and anti-corrosion layer is located on the side of the flow channel plate away from the flat plate.

[0016] On the other hand, a battery pack is provided, including a battery and the battery housing, wherein the battery is installed inside the battery housing.

[0017] Beneficial effects:

[0018] In this invention, the liquid cooling structure is connected to the first connecting part inside the box body, and the protective plate is connected to the second connecting part at the end of the box body. By setting the sealing ring between the protective plate and the box body, the liquid cooling structure can be located entirely within the sealing ring, and a sealed cavity is formed between the liquid cooling structure and the protective plate. This allows the liquid cooling structure to be located in a relatively sealed space, effectively preventing the external environment from affecting the liquid cooling structure and causing corrosion, thus improving the service life of the liquid cooling structure.

[0019] The liquid cooling structure of the battery box is the main carrier of the battery pack's thermal management performance. This invention, by designing the liquid cooling structure with anti-corrosion features, can ensure that the liquid cooling structure provides reliable thermal management performance throughout its entire life cycle, thereby extending the battery pack's service life. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a partial structural diagram of the battery box described in an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 This is a partially exploded view of the liquid cooling structure described in an embodiment of the present invention;

[0023] Figure 3 This is a partial structural diagram of the battery box described in an embodiment of the present invention. Figure 2 .

[0024] In the picture:

[0025] 100. Protective plate; 200. Liquid cooling structure; 210. Liquid cooling plate; 211. Flat plate; 212. Flow channel plate; 220. First insulating and anti-corrosion layer; 230. Second insulating and anti-corrosion layer; 231. Spray coating layer; 232. Roller brush layer; 300. Sealing ring; 400. Box body; 410. Box body; 420. First connecting part; 430. Second connecting part; 500. Fastener. Detailed Implementation

[0026] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component 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. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0030] like Figures 1 to 3As shown, this embodiment provides a battery box, including a protective plate 100, a liquid cooling structure 200, a sealing ring 300, and a box body 400. The box body 400 includes a box body 410, a first connecting portion 420, and a second connecting portion 430. The box body 410 has a receiving cavity for accommodating batteries and an opening end communicating with the receiving cavity. The first connecting portion 420 and the second connecting portion 430 are connected to the box body 410 and adjacent to the opening end of the box body 410. The second connecting portion 430 surrounds the receiving cavity in a ring-shaped structure. The first connecting portion 420 is located at the second connecting portion 430. 30 faces the side of the receiving cavity; the liquid cooling structure 200 faces the battery, and at least part of the edge of the liquid cooling structure 200 faces the first connecting part 420 and is fixedly connected to the first connecting part 420; the protective plate 100 is located on the side of the liquid cooling structure 200 away from the housing 400, and the edge of the protective plate 100 faces the second connecting part 430; the sealing ring 300 is located between the edge of the second connecting part 430 and the protective plate 100; the second connecting part 430 is fixedly connected to the protective plate 100 to abut against the sealing ring 300; the liquid cooling structure 200 is located inside the sealing ring 300.

[0031] In this embodiment, the liquid cooling structure 200 is connected to the first connecting portion 420 inside the box body 410, and the protective plate 100 is connected to the second connecting portion 430 at the end of the box body 410. The first connecting portion 420 is located on the side of the second connecting portion 430 facing the receiving cavity. By setting the sealing ring 300 between the edge of the protective plate 100 and the second connecting portion 430, the liquid cooling structure 200 can be located inside the sealing ring 300, thereby allowing the liquid cooling structure 200 to be located in a relatively sealed space. This effectively prevents moisture in the external environment from affecting the liquid cooling structure 200 and causing corrosion, thus improving the service life of the liquid cooling structure 200.

[0032] Specifically, the first connecting part 420 is the inner side beam of the housing 400, and the second connecting part 430 is one end plate in the depth direction of the housing body 410. The side of the first connecting part 420 that connects to the liquid cooling structure 200 is flat, which can improve the connection stability.

[0033] In this embodiment, the open end can be used as the bottom end of the box body 410. After the bottom end is sealed by the protective plate 100, the battery is installed in the receiving cavity and comes into contact with the liquid cooling structure 200 to achieve thermal management of the battery. Subsequently, the open end of the top of the box body 410 is sealed to form a closed chamber to prevent the liquid cooling structure 200 from contacting water vapor in the external environment and causing corrosion.

[0034] Furthermore, the battery box also includes fasteners 500, and the edge of the guard plate 100 is fixedly connected to the second connecting part 430 by the fasteners 500; after the fixed connection, the guard plate 100 and the second connecting part 430 squeeze and compress the sealing ring 300 to achieve a seal.

[0035] Furthermore, the fastener 500 includes a plurality of bolts that pass through the guard plate 100, the sealing ring 300 and are threadedly screwed into the second connection portion 430.

[0036] By using bolts as fasteners 500, the bolts pass through the protective plate 100 and the sealing ring 300 and are threaded into the second connecting part 430. By tightening the bolts, the two sides of the sealing ring 300 can abut against the edges of the second connecting part 430 and the protective plate 100 respectively, thereby improving the sealing performance between the second connecting part 430 and the edge of the protective plate 100.

[0037] For example, the edge of the protective plate 100 and the sealing ring 300 are respectively provided with corresponding connecting holes (not shown in the figure), and the second connecting part 430 is provided with a threaded hole corresponding to the connecting hole. The bolt passes through the connecting holes on the edge of the protective plate 100 and the sealing ring 300 and is screwed into the corresponding threaded hole on the second connecting part 430, thereby achieving a sealed connection between the edge of the protective plate 100 and the second connecting part 430. In addition, the through hole through which the bolt passes above the sealing ring 300 can also limit the position of the sealing ring 300, preventing the sealing ring 300 from bending or deforming and affecting the sealing effect.

[0038] Furthermore, the first connecting part 420 has a ring-shaped structure, and the first connecting part 420 is welded to the edge of the liquid cooling structure 200.

[0039] It is understandable that after the first connecting part 420 of the annular structure is welded to the edge of the liquid cooling structure 200, a sealed connection can be achieved, thereby forming a sealed space between the liquid cooling structure 200 and the protective plate 100. The side of the liquid cooling structure 200 facing the protective plate 100 is in the sealed space to isolate the influence of the external environment on this side and improve the corrosion resistance of this side of the liquid cooling structure 200.

[0040] Furthermore, the second connecting part 430 is fixedly connected to the end of the box body 410, the first connecting part 420 protrudes from the inner side of the box body 410 and is adjacent to the second connecting part 430, and the edge of the liquid cooling structure 200 is located between the first connecting part 420 and the protective plate 100.

[0041] In this embodiment, the first connecting part 420 protrudes from the inner side of the box body 410, and the second connecting part 430 is located at the end of the box body 410, so that the first connecting part 420 and the second connecting part 430 are staggered. After the first connecting part 420 is welded to the edge of the liquid cooling structure 200, the bottom surface (the side facing the protective plate 100) of the liquid cooling structure 200 can be sealed and protected against corrosion.

[0042] In this embodiment, a sealing groove (not shown in the figure) corresponding to the sealing ring 300 is provided on the side of the protective plate 100 facing the housing 400. The second connecting part 430 uses fasteners 500 to press the sealing ring 300 against the sealing groove. By providing a sealing groove on the edge of the protective plate 100 corresponding to the sealing ring 300, on the one hand, the sealing ring 300 can be quickly aligned and installed, improving assembly efficiency; on the other hand, the sealing groove limits the sealing ring 300, preventing displacement of the sealing ring 300 and affecting the sealing effect.

[0043] In other embodiments, a sealing groove may also be provided on the second connecting portion 430. For example, the second connecting portion 430 has a sealing groove (not shown in the figure) for the sealing ring 300 on the side facing the protective plate 100, and the protective plate 100 uses fasteners 500 to press the sealing ring 300 against the sealing groove. By providing a sealing groove on the second connecting portion 430 at the position corresponding to the sealing ring 300, on the one hand, quick alignment and installation of the sealing ring 300 can be achieved, improving assembly efficiency; on the other hand, the sealing groove limits the sealing ring 300, preventing displacement that could affect the sealing effect.

[0044] In other embodiments, sealing grooves may be provided on opposite sides of the second connection 430 and the protective plate 100, which can further improve the assembly efficiency of the housing 400, the liquid cooling structure 200 and the protective plate 100.

[0045] Furthermore, such as Figure 2 As shown, the liquid cooling structure 200 includes a liquid cooling plate 210, a first insulating and anti-corrosion layer 220, and a second insulating and anti-corrosion layer 230. The first insulating and anti-corrosion layer 220 is located on the side of the liquid cooling plate 210 away from the protective plate 100, and the second insulating and anti-corrosion layer 230 is located on the side of the liquid cooling plate 210 facing the protective plate 100.

[0046] In this embodiment, a first insulating and anti-corrosion layer 220 is provided on the side of the liquid cooling plate 210 facing away from the protective plate 100. This first insulating and anti-corrosion layer 220 provides high-voltage insulation for the liquid cooling plate 210, preventing it from being broken down by high voltage. In this embodiment, a second insulating and anti-corrosion layer 230 isolates the side of the liquid cooling plate 210 facing the protective plate 100 from the external environment, further preventing corrosion and perforation caused by moisture in the external environment, thus avoiding leakage. Even if the seal between the second connecting part 430 and the protective plate 100 fails, the second insulating and anti-corrosion layer 230 can still prevent external moisture from corroding the liquid cooling plate 210 from the side facing the protective plate 100. Therefore, in this embodiment, the second insulating and anti-corrosion layer 230 on the surface of the liquid cooling plate 210 and the sealing ring 300 located between the protective plate 100 and the second connecting part 430 provide dual anti-corrosion protection for the liquid cooling plate 210, further improving the service life of the liquid cooling plate 210 and the overall safety of the battery pack.

[0047] Furthermore, the liquid cooling plate 210 has a first side and a second side opposite to each other along its thickness direction. The second side faces the protective plate 100. The first side has a first edge region and a first non-edge region other than the first edge region (not shown in the figure). The second side has a second edge region and a second non-edge region other than the second edge region (not shown in the figure). The first edge region faces the first connecting part 420 and is welded to the first connecting part 420. The first insulating and anti-corrosion layer 220 covers the first non-edge region. The second insulating and anti-corrosion layer 230 includes a sprayed layer 231 and a roller brush layer 232. The sprayed layer 231 covers the second non-edge region, and the roller brush layer 232 covers the second edge region.

[0048] After the first edge region is welded to the first connecting part 420, the first edge region is completely covered by the first connecting part 420. The first insulating and anti-corrosion layer 220 only needs to cover the entire first non-edge region to avoid extending to the first edge region and affecting the welding between the first edge region and the first connecting part 420.

[0049] For example, the first edge region and the first connecting part 420 are connected by friction stir welding. To prevent the insulating and anti-corrosion layer from affecting the welding between the first edge region and the first connecting part 420, this embodiment only forms the first insulating and anti-corrosion layer 220 in the first non-edge region and the spraying layer 231 in the second non-edge region before welding to improve spraying efficiency. After the first edge region and the first connecting part 420 are connected by friction stir welding, a weld mark will be left in the second edge region corresponding to the first edge region. This weld mark area is a weak area for corrosion protection. At this time, an insulating and anti-corrosion material is used to form a roller brush layer 232 covering the weld mark in the second edge region by roller brushing. The spraying layer 231 and the roller brush layer 232 together constitute the second insulating and anti-corrosion layer 230. In this embodiment, the spraying layer 231 and the roller brush layer 232 are formed sequentially according to the welding process, which can fully cover the liquid cooling plate 210 to achieve the effect of corrosion protection.

[0050] For example, in this embodiment, both the first insulating and anti-corrosion layer 220 and the second insulating and anti-corrosion layer 230 are made of insulating and anti-corrosion materials. The insulating and anti-corrosion materials can be selected from epoxy materials, and the formed first insulating and anti-corrosion layer 220 and the second insulating and anti-corrosion layer 230 have good insulation and anti-corrosion effects.

[0051] In this embodiment, the liquid cooling plate 210 includes a flat plate 211 and a flow channel plate 212. The flow channel plate 212 is fixed to the side of the flat plate 211 away from the housing 400. The edge of the flat plate 211 is welded to the first connecting part 420. The first insulating and anti-corrosion layer 220 is located on the side of the flat plate 211 away from the flow channel plate 212, and the second insulating and anti-corrosion layer 230 is located on the side of the flow channel plate 212 away from the flat plate 211.

[0052] The edge of the planar plate 211 is welded to the first connecting part 420, meaning the planar plate 211 can directly contact the battery installed inside the housing 400. Compared to the flow channel plate 212 contacting the battery, this increases the contact area between the liquid cooling plate 210 and the battery, improving temperature uniformity. In this embodiment, by providing insulating and anti-corrosion layers on the exposed surface of the planar plate 211 (the side facing away from the flow channel plate 212) and the exposed surface of the flow channel plate 212 (the side facing away from the planar plate 211), the exposed surfaces of both the planar plate 211 and the flow channel plate 212 can be protected against corrosion simultaneously, preventing leakage of the liquid cooling plate 210 due to corrosion of the exposed surfaces.

[0053] Furthermore, the thickness of the first insulating and anti-corrosion layer 220 is greater than the thickness of the second insulating and anti-corrosion layer 230. Since the planar plate 211 is mainly used to bear high voltage insulation, the thickness of the first insulating and anti-corrosion layer 220 on the surface of the planar plate 211 is greater than the thickness of the second insulating and anti-corrosion layer 230 on the surface of the flow channel plate 212, so as to achieve a balance between safety and reliability and heat dissipation performance in the liquid cooling structure 200.

[0054] Furthermore, the thickness of the first insulating and anti-corrosion layer 220 is not less than 0.2 mm.

[0055] In this embodiment, the liquid cooling plate 210 is made of aluminum. Since the first insulating and anti-corrosion layer 220 is located on the side of the flat plate 211 facing the battery, the first insulating and anti-corrosion layer 220 will be in direct contact with the battery. In this embodiment, the thickness of the first insulating and anti-corrosion layer 220 is controlled to be not less than 0.2 mm, which can improve the durability of the first insulating and anti-corrosion layer 220, so as to achieve a good and long-lasting insulation effect, and prevent the first insulating and anti-corrosion layer 220 from being too thin and causing pinholes that lead to electrochemical corrosion.

[0056] Furthermore, the thickness of the second insulating and anti-corrosion layer 230 is not less than 0.1 mm.

[0057] Since the flow channel plate 212 does not need to bear high voltage insulation, the thickness of the second insulating and anti-corrosion layer 230 on its exposed surface is controlled to be not less than 0.1mm, which can significantly reduce the thermal resistance of the entire liquid cooling structure 200 and improve the cooling performance.

[0058] In other embodiments, the liquid cooling structure 200 further includes a third insulating and anti-corrosion layer (not shown in the figure). Specifically, an insulating and anti-corrosion material is sprayed or roller-brushed onto the outer peripheral surface of the liquid cooling plate 210 to form a third insulating and anti-corrosion layer for corrosion protection of the outer peripheral surface of the liquid cooling plate 210.

[0059] This embodiment also provides a battery pack (not shown in the figure), including a battery and a battery case as described in any of the above embodiments, with the battery installed inside the battery case.

[0060] In this embodiment, the liquid cooling structure 200 of the battery box is the main carrier of the battery pack's thermal management performance. By designing the liquid cooling structure 200 to be corrosion-resistant, it can provide reliable thermal management performance throughout its entire life cycle, thereby extending the battery pack's service life.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery box, characterized in that, The device includes a protective plate, a liquid cooling structure, a sealing ring, and a housing. The housing includes a main body, a first connecting portion, and a second connecting portion. The main body has a receiving cavity for accommodating a battery and an open end communicating with the receiving cavity. The first connecting portion and the second connecting portion are connected to the main body and adjacent to the open end of the main body. The second connecting portion surrounds the receiving cavity in a ring-shaped structure, and the first connecting portion is located on the side of the second connecting portion facing the receiving cavity. The edge of the liquid cooling structure is at least partially opposite to the first connecting portion and is fixedly connected to the first connecting portion. The protective plate is located on the side of the liquid cooling structure away from the housing, and the edge of the protective plate is opposite to the second connecting portion. The sealing ring is located between the edge of the second connecting portion and the protective plate. The second connecting portion is fixedly connected to the protective plate to abut against the sealing ring, and the liquid cooling structure is located inside the sealing ring.

2. The battery box according to claim 1, characterized in that, It also includes fasteners, the edge of the guard plate being fixedly connected to the second connecting part by the fasteners.

3. The battery box according to claim 2, characterized in that, The fastener includes a plurality of bolts that pass through the guard plate and the sealing ring and are threadedly connected to the second connection portion.

4. The battery box according to claim 1, characterized in that, The first connecting part has a ring-shaped structure and is welded to the edge of the liquid cooling structure.

5. The battery box according to claim 1, characterized in that, The second connecting part is fixedly connected to the end of the box body, the first connecting part protrudes from the inside of the box body and is adjacent to the second connecting part, and the edge of the liquid cooling structure is located between the first connecting part and the protective plate.

6. The battery box according to any one of claims 1 to 5, characterized in that, The liquid cooling structure includes a liquid cooling plate, a first insulating and anti-corrosion layer, and a second insulating and anti-corrosion layer. The first insulating and anti-corrosion layer is located on the side of the liquid cooling plate away from the protective plate; the second insulating and anti-corrosion layer is located on the side of the liquid cooling plate facing the protective plate.

7. The battery box according to claim 6, characterized in that, The thickness of the first insulating and anti-corrosion layer is greater than the thickness of the second insulating and anti-corrosion layer.

8. The battery box according to claim 6, characterized in that, The thickness of the first insulating and anti-corrosion layer is not less than 0.2 mm; and / or, The thickness of the second insulating and anti-corrosion layer is not less than 0.1 mm.

9. The battery box according to claim 6, characterized in that, The liquid cooling plate has a first side and a second side facing away from each other along its thickness direction. The second side faces the protective plate. The first side has a first edge region and a first non-edge region other than the first edge region. The second side has a second edge region and a second non-edge region other than the second edge region. The first edge region faces the first connecting part and is welded to the first connecting part. The first insulating and anti-corrosion layer covers the first non-edge region. The second insulating and anti-corrosion layer includes a sprayed layer and a roller brush layer. The sprayed layer covers the second non-edge region, and the roller brush layer covers the second edge region.

10. The battery box according to claim 6, characterized in that, The liquid cooling plate includes a flat plate and a flow channel plate. The flow channel plate is fixed to the side of the flat plate away from the housing. The first insulating and anti-corrosion layer is located on the side of the flat plate away from the flow channel plate. The edge of the flat plate is welded to the first connecting part. The second insulating and anti-corrosion layer is located on the side of the flow channel plate away from the flat plate.

11. A battery pack, characterized in that, It includes a battery and a battery case as described in any one of claims 1 to 10, wherein the battery is installed inside the battery case.

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