Plate structure assembly, battery pack, electric vehicle, and electric apparatus

Abstract

The present application relates to the field of new energy, and discloses a plate structure assembly, a battery pack, an electric vehicle, and an electric apparatus. The plate structure assembly comprises: a liquid cooling plate, an outer protection plate and a connector; the position where the liquid cooling plate is connected to the outer protection plate is provided with a first nub projecting towards the outer protection plate, and the position where the outer protection plate is connected to the liquid cooling plate is provided with a second nub opposite to and abutting against the first nub and projecting towards the liquid cooling plate; and the first nub is connected to the second nub by means of the connector. According to the plate structure assembly, the battery pack, the electric vehicle, and the electric apparatus in the present application, the rigidity can be improved.

Description

Panel structure components, battery packs, electric vehicles and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese utility model patent application with application number 2023232643447 filed with the China Patent Office on November 30, 2023. The entire contents of the patent application are incorporated into this application by reference. Technical Field

[0003] The present application belongs to the field of new energy technology, and specifically relates to a plate structure component, a battery pack, an electric vehicle and electrical equipment. Background Art

[0004] New energy vehicles (NEVs) use unconventional fuels as their power source (or use conventional fuels with new onboard power units) and incorporate advanced technologies in vehicle power control and drive to create vehicles with advanced technical principles, new technologies, and new structures. New energy vehicles include electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0005] With the development of electric vehicles, the performance of battery packs, as the power source of new energy vehicles, is particularly important.

[0006] In mainstream battery packs, the liquid cooling plate and outer shield are separate components, both connected to the frame beams. Because both the liquid cooling plate and outer shield are large panels, they lack rigidity and are prone to deformation during use.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide a plate structure assembly, battery pack, electric vehicle and electrical equipment that can improve stiffness.

[0009] A plate structure assembly is applied to a battery pack, the plate structure assembly comprising: a liquid cooling plate, an outer protective plate and a connecting piece;

[0010] The connection between the liquid cooling plate and the outer protective plate protrudes toward the outer protective plate to form a first convex bump, and the connection between the outer protective plate and the liquid cooling plate protrudes toward the liquid cooling plate to form a second convex bump that is opposite to and abuts against the first convex bump;

[0011] The first convex hull and the second convex hull are connected through the connecting member.

[0012] In some embodiments, the first convex bump and the second convex bump are both sealed to the connecting member.

[0013] In some embodiments, the connecting member is a friction welding nail, and the friction welding nail includes a nail head and a nail rod. The nail rod passes through the first convex bump and is friction welded with the second convex bump.

[0014] In some embodiments, the first convex hump has an inner concave surface and an outer convex surface that are oppositely disposed, the nail head fits in contact with the lowest position of the inner concave surface, and the outer convex surface abuts against the second convex hump.

[0015] In some embodiments, the thickness of the nail head is smaller than the depth of the inner concave surface.

[0016] In some embodiments, the first convex hull and the second convex hull are in surface contact.

[0017] In some embodiments, the gap between the liquid cooling plate and the outer protective plate is filled with a thermal insulation material.

[0018] In some embodiments, the thermal insulation material is microporous foamed polypropylene.

[0019] In some embodiments, there are a plurality of the first convex hulls, a plurality of the second convex hulls, and the first convex hulls and the second convex hulls are matched in a one-to-one correspondence.

[0020] In some embodiments, the liquid cooling plate includes a first plate and a second plate; the second plate and the outer protective plate are respectively stacked on opposite sides of the first plate along the thickness direction of the first plate, and the gap between the second plate and the first plate forms a liquid cooling channel, and the first bulge is formed on the second plate, the first bulge passes through the first plate, and abuts against the second bulge.

[0021] In some embodiments, the first plate and the second plate are connected by brazing.

[0022] In some embodiments, a avoidance hole is opened on the first plate, and the first convex bump is passed through the avoidance hole.

[0023] In some embodiments, the first plate and the second plate are both made of aluminum.

[0024] In some embodiments, the outer guard plate is made of steel.

[0025] In some embodiments, a surface of the outer protective plate facing away from the liquid cooling plate is covered with a protective layer.

[0026] In some embodiments, the protective layer is a polyvinyl chloride layer.

[0027] A battery pack, comprising:

[0028] A box body, comprising a bottom plate, a top plate, and a plurality of side plates connected between the bottom plate and the top plate, wherein the bottom plate, the top plate, and all the side plates together form a receiving cavity, and at least one of the side plates, the bottom plate, and the top plate is formed by the plate structure assembly structure described in any one of the above; and

[0029] A battery unit is housed in the accommodating cavity;

[0030] The liquid cooling plate is arranged toward the battery unit, and the outer protective plate is located on a side of the liquid cooling plate facing away from the battery unit.

[0031] In some embodiments, the liquid cooling plate is in indirect contact with the battery unit via a thermally conductive structural adhesive.

[0032] An electric vehicle comprises: a battery pack as described in any one of the above embodiments; the electric vehicle utilizes the battery pack to provide electrical energy.

[0033] An electric device, comprising: a battery pack according to any one of the above embodiments; the electric device utilizes the battery pack to provide electrical energy.

[0034] The aforementioned panel structure assembly, battery pack, electric vehicle, and electrical equipment utilizes a first convex bump formed on the liquid cooling plate and a second convex bump formed on the outer shield, with the first and second convex bumps facing and abutting each other. This increases the strength and rigidity of the panel structure assembly and reduces the risk of deformation. The first and second convex bumps are connected by a connector. This connector prevents displacement between the liquid cooling plate and the outer shield, ensuring a secure fixation between the liquid cooling plate and the outer shield, and contributing to the overall strength of the panel structure assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic structural diagram of a box body in one embodiment of the present application, wherein the top plate of the box body is removed and the plate structure assembly forms the bottom plate of the box body;

[0036] FIG2 is an exploded view of the box shown in FIG1 ;

[0037] FIG3 is an exploded view of the liquid cooling plate in the box shown in FIG2 when it is inverted;

[0038] FIG4 is a schematic structural diagram of the outer guard plate in the box shown in FIG2 ;

[0039] FIG5 is a schematic structural diagram of the plate structure assembly in the box shown in FIG1 taken along the AA direction;

[0040] FIG6 is a schematic structural diagram of the cooperation between the second plate member, the outer guard plate and the connecting member in the plate structure assembly shown in FIG5 ;

[0041] FIG7 is a schematic structural diagram of the plate structure assembly cut along direction BB when the plate structure assembly forms a side panel of a box body in one embodiment of the present application;

[0042] FIG8 is a schematic structural diagram of the plate structure assembly cut along the AA direction when the plate structure assembly is constructed to form the top plate of the box body in one embodiment of the present application.

[0043] Figure numbers: 1. Box body; 10. Plate structure assembly; 100. Liquid cooling plate; 200. Outer protective plate; 300. Friction welding nail; 310. Nail head; 320. Nail rod; 400. Insulation material; 110. First convex bump; 111. Inner concave surface; 111a. Lowest position; 112. Outer convex surface; 120. First plate; 130. Second plate; 121. Liquid cooling channel; 122. Avoidance hole; 132. Protective layer; 210. Second convex bump. DETAILED DESCRIPTION

[0044] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0047] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0048] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0050] Below, in conjunction with the accompanying drawings, the plate structure assembly, battery pack, electric vehicle and electrical equipment provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0051] The present application provides a battery pack, which includes a battery cell and a box body 1. The box body 1 includes a bottom plate, a top plate, and multiple side plates connected between the bottom plate and the top plate. The bottom plate, the top plate, and all the side plates enclose a receiving cavity, and the battery cell is accommodated in the receiving cavity.

[0052] Specifically, a battery unit includes a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in a mixed manner to form a battery unit.

[0053] Please refer to Figure 1. The present application also provides a plate structure assembly 10. The plate structure assembly 10 is in contact with the battery cell and can perform heat exchange with the battery cell to achieve cooling or heating of the battery cell. The plate structure assembly 10 is constructed to form at least one of a bottom plate, a top plate and at least one side plate. For example, the plate structure assembly 10 is only constructed to form the bottom plate of the box body 1, or the plate structure assembly 10 is only constructed to form the top plate of the box body 1, or the plate structure assembly 10 is constructed to form a side plate of the box body 1. The specific configuration can be set as needed. When the plate structure assembly 10 is used as a bottom plate, the plate structure assembly 10 is also used to support the battery cell. When the plate structure assembly 10 is used as a side plate or a top plate, the plate structure assembly 10 is also used to limit and protect the battery cell.

[0054] The plate structure assembly 10 and the battery cells can be in direct or indirect contact. For example, indirect contact is achieved by using a thermally conductive adhesive. The thermally conductive adhesive has both adhesive and thermal conductivity properties, not only ensuring relative fixation between the battery cells and the plate structure assembly 10, but also enabling heat transfer between the battery cells and the plate structure assembly 10, thereby enhancing thermal conductivity between the battery cells and the plate structure assembly 10.

[0055] Please refer to Figures 2, 4 to 8. The plate structure assembly 10 includes: a liquid cooling plate 100, an outer protective plate 200, and a connector. The liquid cooling plate 100 is arranged toward the battery cell and is in indirect contact with the battery cell via a thermally conductive structural adhesive. The outer protective plate 200 is located on the side of the liquid cooling plate 100 facing away from the battery cell. The connection between the liquid cooling plate 100 and the outer protective plate 200 protrudes toward the outer protective plate 200 to form a first bulge 110. The connection between the outer protective plate 200 and the liquid cooling plate 100 protrudes toward the liquid cooling plate 100 to form a second bulge 210 that is opposite to and abuts against the first bulge 110. The first bulge 110 and the second bulge 210 are connected by a connector.

[0056] As an example, the first convex bump 110 and the second convex bump 210 are formed by stamping. As an example, the connecting member can be a pin, a screw or other connecting structures.

[0057] In mainstream battery packs, the cooling plate 100 and outer shield 200 are separate components. Both are welded, glued, or riveted to the frame beams of the battery case 1 and together form part of the battery case 1. There is no connection between the cooling plate 100 and outer shield 200. Because both the cooling plate 100 and the bottom shield are large panels, they lack rigidity and are prone to deformation during actual use.

[0058] In the present application, by forming a first bump 110 on the liquid cooling plate 100 and a second bump 210 on the outer cover 200, with the first bump 110 and the second bump 210 facing and abutting each other, the strength and rigidity of the plate structure assembly 10 can be increased, and the risk of deformation of the plate structure assembly 10 can be reduced. The first bump 110 and the second bump 210 are connected by a connector. The provision of the connector can prevent displacement between the liquid cooling plate 100 and the outer cover 200, ensure that the liquid cooling plate 100 and the outer cover 200 are securely fixed, and help improve the overall strength of the plate structure assembly 10.

[0059] Please refer to Figures 2 and 5 to 9 again. In some optional embodiments, the first bump 110 and the second bump 210 are both sealed to the connector to prevent the coolant in the liquid cooling plate 100 from leaking through the gap between the first bump 110 and the connector, and / or the gap between the second bump 210 and the connector.

[0060] In some optional embodiments, the connecting member is a friction welding nail 300 , which includes a nail head 310 and a nail rod 320 . The nail rod 320 passes through the first convex bump 110 and is friction welded to the second convex bump 210 .

[0061] Specifically, the friction welding nail 300 may be a CFF friction welding nail (friction plug rivet welding nail), an SRE friction welding nail (friction welding nail used in a servo drive controller), or the like.

[0062] The friction welding nail 300 is used as a connecting member to connect the first convex bump 110 and the second convex bump 210. On the one hand, it can fasten the liquid cooling plate 100 and the outer protective plate 200. On the other hand, the connection between the friction welding nail 300 and the first convex bump 110 and the connection between the friction welding nail 300 and the second convex bump 210 are both sealed, thereby preventing the coolant in the liquid cooling plate 100 from leaking.

[0063] Furthermore, friction welding nails 300 enable connections in narrow areas, significantly improving the selectivity of connection locations. Furthermore, the volume and mass of the friction elements used in friction welding nails 300 are both smaller than those used in screws for threaded connections, facilitating lightweighting requirements for both the battery pack and the vehicle. Compared to traditional threaded and riveted connections, friction welding nails 300 do not require pre-drilling and tapping of parts, reducing the number of processing steps required. Connections can be made by simply contacting the two sheets, eliminating the need for pre- or post-processing at the connection site, significantly improving connection convenience. Furthermore, unlike traditional threaded and riveted mechanical connections, friction welding nails 300 weld the outer cover 200 and the liquid cooling plate 100 at the molecular level under friction welding pressure, providing greater reliability in vibration conditions and ensuring airtightness.

[0064] The specific process of assembling the friction welding pins 300, the liquid cooling plate 100 and the outer shield 200 is as follows:

[0065] 1. Pre-fit the liquid cooling plate 100 and the outer cover 200, and ensure that the first convex bump 110 and the second convex bump 210 are aligned and fixed in place.

[0066] 2. Use welding equipment to clamp the friction welding pin 300 (made of steel). The welding equipment is running. The friction welding pin 300 is rotated to generate friction force, which first penetrates the lightweight material, that is, penetrates the first convex bump 110 of the liquid cooling plate 100.

[0067] 3. After penetrating the liquid cooling plate 100, the welding equipment will clean and preheat the outer protective plate 200;

[0068] 4. The friction welding pin 300 is rotated to generate heat by friction. Under the axial pressure of the friction welding pin 300 , the outer guard plate 200 melts, thereby achieving welding between the friction welding pin 300 and the outer guard plate 200 .

[0069] It is worth mentioning that since the outer plate 200 plays a protective role and is located outside the liquid cooling plate 100, the strength of the outer plate 200 usually needs to be greater than that of the liquid cooling plate 100. The connection process of the friction welding nail 300 is to first penetrate the light material (for example, the weight is 150N / mm 2 -320N / mm 2 range, and the thickness is within the range of 1.0mm-4.0mm of lightweight metal), and then with relatively strong materials (such as weight of 270N / mm 2 -1800N / mm 2 The friction welding pin 300 is set on one side of the liquid cooling plate 100, and the first convex bump 110 penetrates the second convex bump 210.

[0070] In some optional embodiments, the first convex hump 110 has an inner concave surface 111 and an outer convex surface 112 that are relatively arranged, and the nail head 310 is in contact with the lowest position 111a of the inner concave surface 111 to enable better sealing between the first convex hump 110 and the connecting member, and the outer convex surface 112 is in contact with the second convex hump 210.

[0071] Furthermore, in some optional embodiments, the thickness of the nail head 310 is smaller than the depth of the inner concave surface 111 .

[0072] Specifically, taking the stamping process of the first and second convex bumps 110, 210 as an example, the concave surface 111 of the first convex bump 110 defines a first space, within which the head 310 of the friction welding pin 300 is located. Therefore, the space occupied by the first convex bump 110 overlaps with the space occupied by the head 310, reducing the space required for connecting and fastening the outer cover 200 to the liquid cooling plate 100, thereby improving the energy efficiency of the battery pack. Furthermore, this design prevents the friction welding pin 300 from contacting the battery cell when the liquid cooling plate 100 is in contact, ensuring secure installation of the friction welding pin 300. In some optional embodiments, the first and second convex bumps 110 and 210 form surface-to-surface contact. This surface-to-surface contact between the first and second convex bumps 110 and 210 provides effective operating space for the friction welding pin 300, facilitating its installation.

[0073] Referring to Figures 5 to 9 , in some optional embodiments, the gap between the liquid cooling plate 100 and the outer shield 200 is filled with insulation material 400 to enhance the thermal insulation performance of the panel assembly 10. Furthermore, after being connected by friction welding pins 300, the insulation material 400 between the liquid cooling plate 100 and the outer shield 200 provides support for the liquid cooling plate 100 and the outer shield 200, further enhancing the overall rigidity and load-bearing capacity of the panel assembly 10.

[0074] As an example, the thermal insulation material 400 may be aerogel, foamed polyurethane, microporous foamed polypropylene, etc. Taking the thermal insulation material 400 as microporous foamed polypropylene (MPP) as an example, microporous foamed polypropylene is lightweight, high-strength, clean and environmentally friendly, has good cushioning protection, and thermal insulation properties, so that the panel structure assembly 10 has a lighter weight, higher rigidity, and better thermal insulation properties.

[0075] Referring to Figures 2 and 4 , in some embodiments, there are multiple first bumps 110 and multiple second bumps 210, with each first bump 110 corresponding to each second bump 210. The corresponding first bumps 110 and second bumps 210 are connected by a connector. By properly distributing the first bumps 110 and second bumps 210, the load of the battery cells can be evenly distributed across the liquid cooling plate 100 and the outer cover 200.

[0076] Please refer to Figures 2 to 8. The liquid cooling plate 100 includes a first plate 120 and a second plate 130. The second plate 130 and the outer protective plate 200 are respectively stacked on opposite sides of the first plate 120 along the thickness direction of the first plate 120, and the gap between the second plate 130 and the first plate 120 forms a liquid cooling channel 121. A first convex bulge 110 is formed on the second plate 130. The first convex bulge 110 passes through the first plate 120 and abuts against the second convex bulge 210.

[0077] Specifically, a stamped portion that is recessed toward the outer guard plate 200 is stamped on the first plate 120, and an unstamped portion on the second plate 130 (the first bulge 110 is the stamped portion on the second plate 130, and the portion of the second plate 130 other than the first bulge 110 is the unstamped portion) and the stamped portion of the first plate 120 define a liquid cooling channel 121.

[0078] The liquid cooling channel 121 is used to allow the coolant to flow, and to exchange heat between the coolant and the battery cells. It is worth mentioning that after the plate structure assembly 10 is assembled, the first convex bump 110 and the second convex bump 210 should avoid the liquid cooling channel 121.

[0079] In this embodiment, the plate structure assembly 10 not only has high rigidity, but can also utilize the coolant in the liquid cooling channel 121 to cool down or heat up the battery cells.

[0080] It's worth noting that when the battery cells are placed within the housing 1, the side of the second plate 130 facing away from the first plate 120 faces the battery cells. For example, the side of the second plate 130 facing away from the first plate 120 makes indirect contact with the battery cells via thermally conductive structural adhesive. During actual installation, the second plate 130 faces inward relative to the first plate 120, while the outer protective plate 200 faces outward relative to the first plate 120.

[0081] In some optional embodiments, the first plate 120 and the second plate 130 are connected by brazing. Specifically, the unstamped portion of the second plate 130 and the stamped portion of the first plate 120 define the liquid cooling channel 121, and the unstamped portions of the first and second plates 120, 130 are affixed and brazed to each other. This connection method is reliable and stable, and helps to improve the strength of the connection between the first and second plates 120, 130.

[0082] In some optional embodiments, the first plate 120 is provided with an escape hole 122, and the first convex bump 110 is passed through the escape hole 122 to facilitate installation of the connector. The provision of the escape hole 122 improves the ease and efficiency of installation of the connector.

[0083] In some embodiments, the first plate 120 and the second plate 130 are both made of aluminum, and the outer guard plate 200 is made of steel.

[0084] In the above embodiment, the first and second plates 120, 130 are made of aluminum, which offers rapid heat dissipation and a low weight. The outer shield 200 is made of steel, which offers high strength and strong collision resistance, effectively protecting the battery cells. Furthermore, the friction welding nails 300 eliminate the intermetallic hardening phase, as there is no direct thermal connection between the aluminum and steel, making it more suitable for connecting dissimilar metals. Furthermore, this connection method offers advantages such as lightweight, convenient connection, and reliable connection.

[0085] In some optional embodiments, the surface of the outer shield 200 facing away from the liquid cooling plate 100 is covered with a protective layer 132. The protective layer 132 has buffering and impact protection functions, and can protect the outer shield 200 to increase the service life of the battery pack.

[0086] As shown in Figure 5, protective layer 132 is, for example, a polyvinyl chloride (PVC) layer. PVC layers offer excellent corrosion resistance, stone impact resistance, sound insulation, and heat insulation. For example, in a battery pack used in a new energy vehicle, where the battery pack is mounted on the chassis, the PVC layer can effectively protect the battery pack surface from erosion by road debris, acid rain, and salt, thereby extending the chassis's service life.

[0087] The present application also provides an electric vehicle, which may include the battery pack described in any one of the above embodiments, and the electric vehicle uses the battery pack to provide electrical energy.

[0088] For the convenience and simplicity of description, the specific structure of the electric vehicle described above can refer to the corresponding introduction in the aforementioned battery pack embodiment. The technical problems solved and the technical effects achieved by the battery pack can also be achieved by the electric vehicle, so they will not be repeated here.

[0089] The present application also provides an electric device, which includes the battery pack described in any one of the above embodiments, and the electric device uses the battery pack to provide power. For example, the electric device can be a new energy vehicle.

[0090] For the convenience and simplicity of description, the specific structure of the electrical equipment described above can refer to the corresponding introduction in the aforementioned battery pack embodiment. The technical problems solved and the technical effects achieved by the battery pack can also be achieved by the electrical equipment, so they will not be repeated here.

[0091] Referring to Figures 1, 2, and 8, the aforementioned panel structure assembly 10, battery pack, electric vehicle, and electrical equipment, by forming a first bump 110 on the liquid cooling plate 100 and a second bump 210 on the outer shield 200, with the first bump 110 and the second bump 210 facing and abutting each other, can increase the strength and rigidity of the panel structure assembly 10 and reduce the risk of deformation of the panel structure assembly 10. The first bump 110 and the second bump 210 are connected by a connector. The provision of the connector prevents displacement between the liquid cooling plate 100 and the outer shield 200, ensuring a secure fixation between the liquid cooling plate 100 and the outer shield 200, and contributing to the overall strength of the panel structure assembly 10.

[0092] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A plate structure assembly (10), characterized in that: Applied to a battery pack, the plate structure assembly (10) comprises: a liquid cooling plate (100), an outer protective plate (200) and a connecting piece; The connection between the liquid cooling plate (100) and the outer protective plate (200) protrudes toward the outer protective plate (200) to form a first convex bump (110), and the connection between the outer protective plate (200) and the liquid cooling plate (100) protrudes toward the liquid cooling plate (100) to form a second convex bump (210) that is opposite to and abuts against the first convex bump (110); The first convex hump (110) and the second convex hump (210) are connected via the connecting member.

2. The plate structure assembly (10) according to claim 1, characterized in that The first convex bump (110) and the second convex bump (210) are both sealedly connected to the connecting member.

3. The plate structure assembly (10) according to claim 2, characterized in that The connecting piece is a friction welding nail (300), and the friction welding nail (300) comprises a nail head (310) and a nail rod (320). The nail rod (320) passes through the first convex bump (110) and is friction welded with the second convex bump (210).

4. The plate structure assembly (10) according to claim 3, characterized in that The first convex hump (110) has an inner concave surface (111) and an outer convex surface (112) arranged opposite to each other, the nail head (310) is in contact with the lowest position (111a) of the inner concave surface (111), and the outer convex surface (112) is in contact with the second convex hump (210).

5. The plate structure assembly (10) according to claim 4, characterized in that The thickness of the nail head (310) is smaller than the depth of the concave surface (111).

6. The plate structure assembly (10) according to claim 1, characterized in that The first convex hull (110) and the second convex hull (210) are in surface contact.

7. The plate structure assembly (10) according to claim 1, characterized in that The gap between the liquid cooling plate (100) and the outer protective plate (200) is filled with a thermal insulation material (400).

8. The plate structure assembly (10) according to claim 7, characterized in that The thermal insulation material (400) is microporous foamed polypropylene.

9. The plate structure assembly (10) according to claim 1, characterized in that There are a plurality of the first convex hulls (110), a plurality of the second convex hulls (210), and the first convex hulls (110) and the second convex hulls (210) are matched in a one-to-one correspondence.

10. The plate structure assembly (10) according to claim 1, characterized in that The liquid cooling plate (100) includes a first plate (120) and a second plate (130); the second plate (130) and the outer protective plate (200) are respectively stacked on opposite sides of the first plate (120) along the thickness direction of the first plate (120), and the gap between the second plate (130) and the first plate (120) forms a liquid cooling channel (121), and the first convex bump (110) is formed on the second plate (130), and the first convex bump (110) passes through the first plate (120) and abuts against the second convex bump (210).

11. The plate structure assembly (10) according to claim 10, characterized in that The first plate (120) and the second plate (130) are connected by brazing.

12. The plate structure assembly (10) according to claim 10, characterized in that The first plate (120) is provided with an avoidance hole (122), and the first convex bump (110) is passed through the avoidance hole (122).

13. The plate structure assembly (10) according to claim 10, characterized in that The first plate (120) and the second plate (130) are both made of aluminum.

14. The plate structure assembly (10) according to claim 1, characterized in that The outer guard plate (200) is made of steel.

15. The plate structure assembly (10) according to claim 1, characterized in that A protective layer (132) is provided on the surface of the outer protective plate (200) facing away from the liquid cooling plate (100).

16. The plate structure assembly (10) according to claim 15, characterized in that The protective layer (132) is a polyvinyl chloride layer.

17. A battery pack, characterized in that: The battery pack comprises: A box body (1), comprising a bottom plate, a top plate, and a plurality of side plates connected between the bottom plate and the top plate, wherein the bottom plate, the top plate, and all the side plates together form a receiving cavity, and at least one of the side plates, the bottom plate, and the top plate is formed by the plate structure assembly (10) according to any one of claims 1 to 16; and A battery unit is accommodated in the accommodation cavity; The liquid cooling plate (100) is arranged toward the battery unit, and the outer protective plate (200) is located on a side of the liquid cooling plate (100) facing away from the battery unit.

18. The battery pack according to claim 17, characterized in that: The liquid cooling plate (100) is in indirect contact with the battery unit via a heat-conducting structural adhesive.

19. An electric vehicle, characterized in that: include: The battery pack according to claim 17 or 18; The electric vehicle utilizes the battery pack to provide electrical energy.

20. An electrical equipment, characterized in that: include: The battery pack according to claim 17 or 18; The power-consuming device uses the battery pack to provide electrical energy.

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