Liquid cooling bottom plate, battery box, battery pack and engineering machinery

Abstract

The invention relates to the field of battery box manufacturing, and discloses a liquid-cooled bottom plate, a battery box, a battery pack and engineering machinery, the battery box comprises the liquid-cooled bottom plate, a first end plate and a second end plate, the liquid-cooled bottom plate is an integrally formed part and comprises a bottom plate body serving as the bottom wall of the battery box and internally provided with a liquid-cooled channel penetrating in the first direction, two channel openings of the liquid cooling channel are correspondingly arranged on two opposite end surfaces of the bottom plate body along the first direction; and the two side beams are separately formed at the two ends of the bottom plate body in the second direction. The first end plate comprises a first end plate body and a first plug, one channel opening is plugged by the first plug, the second end plate comprises a second end plate body and a second plug, the other channel opening is plugged by the second plug, and the first end plate body, the second end plate body and the two side beams form a circumferential annular frame surrounding the bottom plate body. According to the liquid cooling bottom plate, the battery box, the battery pack and the engineering machinery, the space utilization rate and the battery integration degree of the battery pack can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery box manufacturing, and specifically relates to a liquid cooling base plate, a battery box, a battery pack and engineering machinery. Background Art

[0002] In the prior art, a liquid cooling plate is usually installed in the battery box of new energy engineering machinery to dissipate heat from the battery cells to ensure the safety of battery operation. However, the battery box and the liquid cooling plate are generally processed and manufactured separately, and then the liquid cooling plate is assembled into the battery box. The liquid cooling plate occupies a large space in the battery box, reducing the space utilization rate of the battery pack and the battery capacity density. Summary of the invention

[0003] The purpose of this application is to provide a liquid-cooled base plate, a battery box, a battery pack and engineering machinery, which are conducive to improving the space utilization and battery integration of the battery pack.

[0004] In order to achieve the above-mentioned object, the first aspect of the present application provides a liquid cooling base plate, which is used for a battery box, and the liquid cooling base plate is an integrally formed part and includes:

[0005] A bottom plate body, serving as the bottom wall of the battery box and provided with a liquid cooling channel extending along a first direction, wherein two channel openings of the liquid cooling channel are correspondingly arranged on two opposite end surfaces of the bottom plate body along the first direction;

[0006] Two side beams extend along the first direction and are arranged at intervals along the second direction. The two side beams are correspondingly formed on two end portions of the bottom plate body along the second direction.

[0007] In a specific embodiment, the liquid-cooled base plate also includes a plurality of flow channel partition portions located in the liquid cooling channel, the top and bottom ends of the flow channel partition portions are correspondingly connected to the top wall and bottom wall of the liquid cooling channel, and the plurality of flow channel partition portions extend along the first direction and are arranged at intervals along the second direction.

[0008] In a specific embodiment, a flow dividing baffle portion extending along the first direction is further provided between any two adjacent flow channel baffle portions;

[0009] and / or, for the plurality of flow channel baffle portions, the thickness of the flow channel baffle portion located in the middle along the second direction is greater than the thickness of the remaining flow channel baffle portions;

[0010] And / or, along the second direction, two plate ends of the flow channel baffle portion with an odd number along the first direction are staggered with two plate ends of the flow channel baffle portion with an even number along the second direction.

[0011] In a specific embodiment, the liquid cooling base plate is an integrally formed extrusion;

[0012] And / or, the side beam is cylindrical, and a weight-reducing hole is provided on the peripheral wall of the side beam;

[0013] And / or, the cross-section of the side beam is a rounded trapezoid.

[0014] A second aspect of the present application provides a battery box, which includes the above-mentioned liquid-cooled base plate.

[0015] In a specific embodiment, the battery box also includes a first end plate and a second end plate arranged at intervals along a first direction, the first end plate includes a first end plate body and a first plug arranged along the first direction and integrally formed, the first plug is inserted into and matched with one of the channel openings to block one of the channel openings, the second end plate includes a second end plate body and a second plug arranged along the first direction and integrally formed, the second plug is inserted into and matched with another channel opening to block the other channel opening, the first end plate body, the second end plate body and the two side beams form a circumferential ring frame surrounding the bottom plate body.

[0016] In a specific embodiment, the first end plate also includes a first connecting plate portion integrally formed between the first end plate body and the first plug, and the first connecting plate portion is spliced ​​with the bottom plate body when the first plug is plugged into one of the channel openings. The second end plate also includes a second connecting plate portion integrally formed between the second end plate body and the second plug, and the second connecting plate portion is spliced ​​with the bottom plate body when the second plug is plugged into another of the channel openings.

[0017] In a specific embodiment, the battery box also includes a first bottom beam member, which is arranged above the bottom plate body and is used to support one end of the battery module along the first direction, and the second end plate also includes a second bottom beam portion integrally formed between the second plug and the second end plate body, the top surface height of the second bottom beam portion is flush with the top surface height of the first bottom beam member, and is used to support the other end of the battery module along the first direction.

[0018] In a specific embodiment, the first end plate and the second end plate are respectively integrally formed parts;

[0019] And / or, the battery box further comprises two adapter blocks having adapter channels, the first end plate body is provided with a first inlet hole and a first outlet hole at intervals along the second direction, the top wall of the end of the bottom plate body close to the first end plate is provided with a second inlet hole and a second outlet hole communicating with the liquid cooling channel, one end of one of the adapter blocks passes through the first inlet hole and communicates with the liquid cooling channel through the second inlet hole, and one end of the other adapter block passes through the first outlet hole and communicates with the liquid cooling channel through the second outlet hole;

[0020] And / or, the battery box further includes an upper cover, the upper cover is connected to the circumferential ring frame, and the upper cover, the liquid-cooled bottom plate, the first end plate and the second end plate jointly define a cavity for accommodating the battery module.

[0021] A third aspect of the present application provides a battery pack, which includes the above-mentioned battery box, and a battery module is provided in the cavity of the battery box.

[0022] A fourth aspect of the present application provides an engineering machine comprising the above-mentioned battery pack.

[0023] Through the above technical solution, the bottom plate body of the liquid-cooled bottom plate serves as the bottom wall of the battery box, eliminating the need for a separate liquid cooling plate, effectively reducing the overall cost of the battery pack, making the battery pack lighter and the overall structure more compact, and also improving the space utilization of the battery pack and the battery capacity density. In addition, the bottom plate body of the liquid-cooled bottom plate and the two side beams are integrally formed, which can reduce the number of connection points, improve the rigidity and stability of the overall structure, and reduce the risks caused by loose connections or failures. Moreover, the bottom plate body of the liquid-cooled bottom plate and the two side beams are integrally formed, which can also reduce assembly steps, simplify the production process, and save manpower and time costs.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 A structural exploded diagram of a battery pack according to a specific embodiment of the present application is shown;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the liquid cooling base plate, the first end plate and the second end plate;

[0028] Figure 3 for Figure 1 A schematic structural diagram of the first end plate in FIG.

[0029] Figure 4 for Figure 1 A schematic structural diagram of the second end plate in FIG.

[0030] Figure 5 for Figure 1 A cross-sectional view of the liquid cooling base plate in FIG.

[0031] Figure 6 for Figure 1 A cross-sectional view of the first bottom beam member in FIG.

[0032] Description of Reference Numerals

[0033] 100 battery box 1 liquid cooling base plate

[0034] 11 floor plate body 12 side beam

[0035] 121 weight reduction hole 122 fixed installation part

[0036] 13 flow channel partition part 14 flow dividing partition part

[0037] 2a First end plate 21a First end plate body

[0038] 22a first plug 23a first connecting plate portion

[0039] 2b Second end plate 21b Second end plate body

[0040] 22b second plug 23b second connecting plate portion

[0041] 24b Second bottom beam portion 3 First bottom beam member

[0042] 4 adapter block 5 upper cover

[0043] 51 window 52 explosion-proof valve installation hole

[0044] 200 battery module 300 thermal conductive layer

[0045] 400 electrical integrated panel 500 explosion-proof valve

[0046] 600 seal ring DETAILED DESCRIPTION

[0047] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0048] In the prior art, the battery box and the liquid cooling plate are generally processed and manufactured separately, and then the liquid cooling plate is assembled into the battery box. This structural method has the following problems: First, after the heat of the battery cell is absorbed by the liquid cooling plate, the heat of the liquid cooling plate needs to be transferred to the outside air through the box, which reduces the heat dissipation efficiency of the battery box; second, the separate design of the liquid cooling plate and the box will increase the overall weight of the battery pack and increase the cost; third, the separate design of the liquid cooling plate and the box reduces the space utilization of the battery pack and the battery integration is low.

[0049] In view of this, if Figure 1 and Figure 2 As shown, the present application provides a liquid-cooling base plate 1 for a battery box, which is an integrally formed part and includes a base plate body 11 and two side beams 12. The base plate body 11 serves as the bottom wall of the battery box 100, and is provided with a liquid cooling channel that runs through along a first direction, and two channel openings of the liquid cooling channel are correspondingly arranged on two opposite end surfaces of the base plate body 11 along the first direction. Since the liquid cooling channel runs through the base plate body 11 along the first direction, two oppositely arranged channel openings are formed at the two ends of the base plate body 11 along the first direction, and the two channel openings connect the liquid cooling channel. The two side beams 12 extend along the first direction and are arranged at intervals along the second direction, and the two side beams 12 are correspondingly formed on the two ends of the base plate body 11 along the second direction.

[0050] Among them, the bottom plate body 11 of the liquid cooling bottom plate 1 serves as the bottom wall of the battery box 100, eliminating the need for a separate liquid cooling plate or the outer peripheral wall of the bottom of the box, effectively reducing the overall cost of the battery pack, making the battery pack lighter and more compact in overall structure, and also improving the space utilization of the battery pack and the battery capacity density. In addition, since the bottom plate body 11 of the liquid cooling bottom plate 1 directly serves as the bottom wall of the battery box 100, the heat transfer link is reduced, and the heat of the battery cell is directly transferred to the external air after being absorbed by the battery box, thereby improving the heat dissipation efficiency of the battery box.

[0051] In addition, the liquid cooling channel is used for circulation of the cooling liquid. The liquid cooling channel passes through the base plate body 11 along the first direction. The liquid cooling channel is a straight channel and the cross-sectional shape is equal everywhere. In this way, the liquid cooling channel does not have a complex bending and shielding structure, so that the liquid cooling channel can be directly processed on the base plate body 11 along the first direction without being assembled through multiple peripheral walls, thereby making the structure and processing technology of the liquid cooling base plate 1 simpler, and further allowing the liquid cooling base plate 1 to be formed as an integral molded part.

[0052] In addition, the liquid-cooled base plate 1 is an integrally formed part, that is, the base plate body 11 and the two side beams 12 are manufactured in one piece. No additional welding connection processing is required between the base plate body 11 and the side beams 12, which can reduce the number of parts and the number of welds, simplify the structure, facilitate processing, reduce the number of molds, reduce the weight of finished products, improve volume utilization and assembly efficiency, achieve lightweight and easy processing of the box structure, and avoid the box stress concentration problem caused by traditional bending forming processes, effectively improve the main structural strength of the battery box and the reliability of core components, improve the service safety and service life of the battery pack, and be suitable for more application scenarios.

[0053] It should be noted that the first direction and the second direction may be arranged at an angle or perpendicularly. The structural shapes of the bottom plate body 11 and the side beam 12 may be various, for example, the cross section of the bottom plate body 11 is rectangular, trapezoidal, etc., and the side beam 12 is a solid beam body or a hollow beam body, etc. The liquid-cooled bottom plate 1 may be manufactured by at least one of extrusion molding and machining molding. For example, the liquid-cooled bottom plate 1 may be an integrally molded extrusion part, or an integrally molded part formed by machining, or an integrally molded part formed by extrusion molding and then machining, etc. These structural forms should also fall within the scope of protection of this application.

[0054] like Figure 1 As shown, the second aspect of the present application provides a battery box, which includes the above-mentioned liquid cooling base plate 1. Since the battery box includes the above-mentioned liquid cooling base plate 1, it also has all the technical effects brought by the liquid cooling base plate 1.

[0055] Optionally, the battery box further includes a first end plate 2a and a second end plate 2b extending in the second direction and arranged at intervals in the first direction. The first end plate 2a and the second end plate 2b are arranged at intervals on both sides of the liquid cooling bottom plate 1 in the first direction, and correspondingly block two channel openings of the liquid cooling channel arranged oppositely in the first direction. The first end plate 2a, the second end plate 2b and the two side beams 12 are connected to form a circumferential ring frame surrounding the bottom plate body 11.

[0056] Specifically, Figure 1 and Figure 2 As shown, the first end plate 2a blocks one of the channel openings of the liquid cooling channel, and the second end plate 2b blocks the other channel opening of the liquid cooling channel, so that the two channel openings of the liquid cooling channel can be closed. In addition, the liquid cooling bottom plate 1, the first end plate 2a and the second end plate 2b are connected by welding to form the lower box body of the battery box 100, and the first end plate 2a, the second end plate 2b and the two side beams 12 are connected to form a circumferential ring frame around the bottom plate body 11. The circumferential ring frame can serve as the main frame of the lower box body of the battery box 100, so that the battery box 100 has sufficient structural strength.

[0057] Alternatively, if Figure 2 As shown, the first end plate 2a may include a first end plate body 21a and a first plug 22a arranged along a first direction and formed in one piece, and the first plug 22a is inserted and matched with one of the channel openings to block one of the channel openings. The second end plate 2b includes a second end plate body 21b and a second plug 22b arranged along a first direction and formed in one piece, and the second plug 22b is inserted and matched with another channel opening to block another channel opening. The first end plate body 21a, the second end plate body 21b and the two side beams 12 form a circumferential ring frame around the bottom plate body 11. In this way, the first end plate body 21a and the first plug 22a are formed in one piece, and the second end plate body 21b and the second plug 22b are formed in one piece, which can reduce the welding connection structure between the box frame and the liquid cooling plate plug, improve the overall strength of the battery box, and reduce additional connection processing costs and material costs.

[0058] Optionally, the battery box further includes an upper cover 5, which is connected to the circumferential ring frame. The upper cover 5, the liquid cooling bottom plate 1, the first end plate 2a and the second end plate 2b together define a cavity for accommodating the battery module 200. Figure 1 As shown, upper cover connecting parts extend horizontally from the top ends of the first end plate body 21a and the second end plate body 21b respectively, and a plurality of upper cover connecting holes for connecting with the upper cover 5 are respectively provided on the upper cover connecting parts and the side beams 12, so that the upper cover 5 can be connected with the circumferential ring frame through the upper cover connecting holes.

[0059] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, the first end plate 2a may further include a first connecting plate portion 23a integrally formed between the first end plate body 21a and the first plug 22a, and the first connecting plate portion 23a is spliced ​​with the bottom plate body 11 when the first plug 22a is plugged and matched with one of the channel openings. The second end plate 2b may further include a second connecting plate portion 23b integrally formed between the second end plate body 21b and the second plug 22b, and the second connecting plate portion 23b is spliced ​​with the bottom plate body 11 when the second plug 22b is plugged and matched with another channel opening. In this way, it is convenient to weld the first end plate 2a and the second end plate 2b to the liquid cooling bottom plate 1, avoiding structural interference during welding, and increasing the distance between the weld along the first direction and the weld along the third direction, reducing processing deformation.

[0060] Furthermore, if Figure 1 and Figure 6As shown, the battery box also includes a first bottom beam 3, which is arranged above the bottom plate body 11 and is used to support one end of the battery module 200 along the first direction. The second end plate 2b also includes a second bottom beam 24b integrally formed between the second plug 22b and the second end plate body 21b, and the top surface height of the second bottom beam 24b is flush with the top surface height of the first bottom beam 3, and is used to support the other end of the battery module 200 along the first direction. In this way, the second bottom beam 24b is integrally formed with the second connecting plate 23b, the second plug 22b and the second end plate body 21b, respectively, without the need to match and assemble multiple independent components, so that the battery box 100 has a higher degree of integration, can reduce the number of parts, simplify the structure, and is easy to process, reducing the number of open mold parts, reducing the weight of the finished product, and can improve the volume utilization and assembly efficiency. Among them, the second bottom beam 24b can be provided with an avoidance groove to prevent the weld scar from interfering with the adjacent battery module 200 in the third direction and the second direction.

[0061] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, the first end plate body 21a, the first connecting plate portion 23a and the first plug 22a are connected in sequence, and the second end plate body 21b, the second bottom beam portion 24b, the second connecting plate portion 23b and the second plug 22b are connected in sequence. In order to facilitate the welding connection of the liquid-cooled bottom plate 1 with the first connecting plate portion 23a and the second connecting plate portion 23b, the first connecting plate portion 23a and the second connecting plate portion 23b are respectively provided with fillet grooves at both ends along the second direction. After the first connecting plate portion 23a and the second connecting plate portion 23b are spliced ​​with the bottom plate body 11, the top surfaces of the first connecting plate portion 23a, the second connecting plate portion 23b and the bottom plate body 11 are flush. The first bottom beam 3 can be welded to the bottom plate body 11, and the second bottom beam 24b and the first bottom beam 3 are respectively provided with fixed connection holes for fixed connection with the battery module 200. The second bottom beam 24b and the second connecting plate portion 23b are hollow inside to form a weight-reducing cavity to reduce the weight of the battery pack and reduce material costs.

[0062] Optionally, in order to facilitate manufacturing and reduce manufacturing costs, the liquid cooling bottom plate 1, the first end plate 2a, and the second end plate 2b can be extruded parts of an integral molded part. The liquid cooling bottom plate 1, the first end plate 2a, the second end plate 2b, and the first bottom beam 3 together constitute a lower box body that accommodates the battery module 200. The interior of the lower box body is spliced ​​by welding welds, and at the same time, an internal sealing effect is achieved to ensure the sealing of the battery box.

[0063] Alternatively, if Figure 1 , Figure 2 and Figure 3As shown, the battery box may also include two adapter blocks 4 with adapter channels, the first end plate body 21a is provided with a first inlet hole and a first outlet hole at intervals along the second direction, and the top wall of the end of the bottom plate body 11 close to the first end plate 2a is provided with a second inlet hole and a second outlet hole connected to the liquid cooling channel, one end of one adapter block 4 passes through the first inlet hole and is connected to the liquid cooling channel through the second inlet hole, and one end of the other adapter block 4 passes through the first outlet hole and is connected to the liquid cooling channel through the second outlet hole. In this way, the coolant can enter the liquid cooling channel from one adapter block 4 and the second inlet hole, and flow out of the liquid cooling channel from the second outlet hole and the other adapter block 4, forming a circulating flow of the coolant, which can cool down the battery module 200 in the battery box 100. The adapter block 4 is used to realize the connection between the coolant supply device outside the battery box 100 and the liquid cooling bottom plate 1 inside the battery box 100, and it is no longer necessary to set a liquid cooling adapter hose, which can reduce the mold opening fee and material fee, and the overall strength is higher and the corrosion resistance is better.

[0064] Specifically, Figure 2 As shown, the two adapter blocks 4 respectively include an outer joint part and an inner adapter part arranged along the first direction, the two outer joint parts are pipe joints and are correspondingly located outside the first inlet hole and the first outlet hole, the tube wall of the inner adapter part is provided with a flat cut portion and the end portion has an end wall, the flat cuts of the two inner adapter parts are correspondingly buckled on the second inlet hole and the second outlet hole, and are correspondingly welded and sealed with the peripheral edges of the hole openings of the second inlet hole and the second outlet hole, and the overall structure is simple and compact.

[0065] In some specific embodiments, Figure 5 As shown, the liquid cooling base plate 1 also includes a plurality of flow channel baffle portions 13 located in the liquid cooling channel, and the plurality of flow channel baffle portions 13 extend along the first direction and are arranged at intervals along the second direction. In this way, the channel cavity of the liquid cooling channel can be divided into small flow channels, which is conducive to sufficient heat exchange of the coolant in the liquid cooling channel and good heat dissipation effect. Among them, the top and bottom ends of the flow channel baffle portions 13 can be connected to the top wall and bottom wall of the liquid cooling channel correspondingly, so that the structural strength of the liquid cooling base plate 1 is higher and the structure is more reasonable.

[0066] Optionally, along the second direction, the flow channel baffle parts 13 with odd numbers and the flow channel baffle parts 13 with even numbers are staggered in the second direction. The staggered protruding outer ends of the flow channel baffle parts 13 with odd numbers abut against one of the first end plate 2a and the second end plate 2b, and the staggered protruding outer ends of the flow channel baffle parts 13 with even numbers abut against the other of the first end plate 2a and the second end plate 2b, so that a flow channel arranged in a circuitous manner along the first direction is formed in the channel cavity of the liquid cooling channel.

[0067] Specifically, since the first end plate 2a has a first plug 22a for blocking the channel opening, and the second end plate 2b has a second plug 22b for blocking the channel opening, the staggered protruding outer ends of different flow channel partition parts 13 correspondingly abut against the first plug 22a and the second plug 22b.

[0068] Furthermore, a flow dividing baffle portion 14 extending along the first direction is further provided between any two adjacent flow channel baffle portions 13, so that the coolant can be evenly distributed in the flow channel, and the cooling effect is more balanced.

[0069] Furthermore, for the multiple flow channel baffle portions 13, the thickness of the flow channel baffle portion 13 located in the middle along the second direction is greater than the thickness of the other flow channel baffle portions 13. In this way, the flow channel baffle portion 13 located in the middle can serve as a structural reinforcement rib of the base plate body 11, ensuring that the liquid-cooled base plate 1 has sufficient structural strength.

[0070] Alternatively, if Figure 2 As shown, the side beam 12 may be cylindrical, and a weight-reducing hole 121 is provided on the peripheral wall of the side beam 12, so that the battery box 100 can be made lighter. In addition, the cross-sectional shape of the side beam 12 is a rounded trapezoid, so that the side beam 12 has two inclined surfaces, so that the side beam 12 can meet the requirements of lightweight while ensuring sufficient strength. In addition, a fixed mounting portion 122 for fixed connection with the vehicle body can be welded on the side beam 12.

[0071] The third aspect of the present application provides a battery pack, which includes the battery box 100 described above, and a battery module 200 is arranged in the cavity of the battery box 100. Since the battery pack includes the battery box 100 described above, it also has all the technical effects brought by the battery box 100.

[0072] Alternatively, if Figure 1 As shown, the battery pack may also include a heat-conducting layer 300, an electrical integrated panel 400, an explosion-proof valve 500 and a sealing ring 600. The heat-conducting layer 300 is arranged between the battery module and the liquid-cooled base plate for heat conduction. A window 51 and an explosion-proof valve mounting hole 52 are provided on the upper cover 5. The explosion-proof valve 500 is arranged on the upper cover 5 of the battery box through the explosion-proof valve mounting hole 52. The electrical integrated panel 400 is installed on the inner edge of the window 51, and the plug-in interface of the electrical integrated panel 400 extends outward from the window 51. Among them, the electrical integrated panel 400 includes a high-voltage maintenance switch, high and low voltage connectors and a balancing interface.

[0073] It should be noted that the structural principles of components such as the battery module 200 and the explosion-proof valve 500 are well known to those skilled in the art, and do not belong to the core improvement part of the present application, so they will not be repeated here.

[0074] The fourth aspect of the present application provides an engineering machine, which includes the above-mentioned battery pack. Since the engineering machine includes the above-mentioned battery pack, it also has all the technical effects brought by the battery pack. The engineering machine can be a new energy engineering machine.

[0075] In summary, the first end plate 2a, the second end plate 2b and the liquid cooling base plate 1 of the present application are respectively manufactured by integrated molding technology, which can greatly improve the overall strength of the battery box, the reliability of the core components, the sealing performance, the vibration resistance, the service safety and service life of the battery pack, and the protection effect of the external impact and vibration of the battery box is good. It can well protect the normal operation of the components inside the battery box, ensure the safety performance of the battery pack, and adapt to the use scenarios of harsh working conditions. In addition, the design of the first end plate 2a, the second end plate 2b and the liquid cooling base plate 1 are respectively integrated, with high integration, reducing the number of mold openings, the number of parts, the number of connection parts, the number of welds and the welding links, simplifying the structure, and being easy to process, improving the overall structural rigidity and stability of the battery box 100, and reducing the risk caused by loose connection or failure. In addition, the integrated molding process does not require matching and assembly between multiple independent components, and the assembly efficiency is high, which can achieve higher dimensional accuracy and lower assembly error; at the same time, it avoids the problem of box stress concentration caused by the traditional bending forming process, and reducing the connection points will also reduce potential failure points, improve durability and service life; the integrated design can also optimize space utilization and reduce weight.

[0076] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A liquid cooling base plate, characterized in that: For a battery box, the liquid cooling base plate (1) is an integrally formed part and comprises: A bottom plate body (11) serving as the bottom wall of the battery box and provided with a liquid cooling channel extending along a first direction, wherein two channel openings of the liquid cooling channel are correspondingly arranged on two opposite end surfaces of the bottom plate body (11) along the first direction; Two side beams (12) extend along the first direction and are arranged at intervals along the second direction. The two side beams (12) are correspondingly formed on two end portions of the bottom plate body (11) along the second direction.

2. The liquid cooling base plate according to claim 1, characterized in that: The liquid cooling base plate (1) further comprises a plurality of flow channel baffle portions (13) located in the liquid cooling channel, the top and bottom ends of the flow channel baffle portions (13) being connected to the top wall and the bottom wall of the liquid cooling channel respectively, and the plurality of flow channel baffle portions (13) extending along the first direction and being arranged at intervals along the second direction.

3. The liquid cooling base plate according to claim 2, characterized in that: A flow dividing baffle portion (14) extending along the first direction is further provided between any two adjacent flow channel baffle portions (13); And / or, for the plurality of flow channel baffle portions (13), the thickness of the flow channel baffle portion (13) located in the middle along the second direction is greater than the thickness of the other flow channel baffle portions (13); And / or, along the second direction, two plate ends of the flow channel baffle portion (13) with an odd number along the first direction are staggered with two plate ends of the flow channel baffle portion (13) with an even number along the first direction.

4. The liquid cooling base plate according to claim 1, characterized in that: The liquid cooling base plate (1) is an integrally formed extruded part; And / or, the side beam (12) is cylindrical, and a weight-reducing hole is provided on the peripheral wall of the side beam (12); And / or, the cross-section of the side beam (12) is in the shape of a rounded trapezoid.

5. A battery box, characterized in that: It comprises the liquid cooling base plate (1) as claimed in any one of claims 1 to 4.

6. The battery box according to claim 5, characterized in that: The battery box also includes a first end plate (2a) and a second end plate (2b) extending along the second direction and arranged at intervals along the first direction, the first end plate (2a) including a first end plate body (21a) and a first plug (22a) arranged along the first direction and formed as one piece, the first plug (22a) being inserted and matched with one of the channel openings to block one of the channel openings, the second end plate (2b) including a second end plate body (21b) and a second plug (22b) arranged along the first direction and formed as one piece, the second plug (22b) being inserted and matched with another of the channel openings to block another of the channel openings, the first end plate body (21a), the second end plate body (21b) and the two side beams (12) forming a circumferential ring frame surrounding the bottom plate body (11).

7. The battery box according to claim 6, characterized in that: The first end plate (2a) further comprises a first connecting plate portion (23a) integrally formed between the first end plate body (21a) and the first plug (22a), and the first connecting plate portion (23a) is spliced ​​with the bottom plate body (11) when the first plug (22a) is plugged and matched with one of the channel openings; the second end plate (2b) further comprises a second connecting plate portion (23b) integrally formed between the second end plate body (21b) and the second plug (22b), and the second connecting plate portion (23b) is spliced ​​with the bottom plate body (11) when the second plug (22b) is plugged and matched with the other channel opening; And / or, the battery box further comprises a first bottom beam member (3), the first bottom beam member (3) being arranged above the bottom plate body (11) and being used to support one end of the battery module (200) along the first direction, the second end plate (2b) further comprising a second bottom beam portion (24b) integrally formed between the second plug (22b) and the second end plate body (21b), the top surface height of the second bottom beam portion (24b) being flush with the top surface height of the first bottom beam member (3), and being used to support the other end of the battery module (200) along the first direction.

8. The battery box according to claim 6, characterized in that: The first end plate (2a) and the second end plate (2b) are respectively integrally formed parts; And / or, the battery box further comprises two adapter blocks (4) having adapter channels, the first end plate body (21a) is provided with a first inlet hole and a first outlet hole spaced apart along the second direction, the top wall of the end of the bottom plate body (11) close to the first end plate (2a) is provided with a second inlet hole and a second outlet hole connected to the liquid cooling channel, one end of one of the adapter blocks (4) passes through the first inlet hole and is connected to the liquid cooling channel through the second inlet hole, and one end of the other adapter block (4) passes through the first outlet hole and is connected to the liquid cooling channel through the second outlet hole; And / or, the battery box further comprises an upper cover (5), the upper cover (5) is connected to the circumferential ring frame, and the upper cover (5), the liquid-cooled base plate (1), the first end plate (2a) and the second end plate (2b) jointly define a cavity for accommodating the battery module (200).

9. A battery pack, characterized in that: The battery box (100) comprises the battery box (100) as claimed in any one of claims 5 to 8, wherein a battery module (200) is provided in a cavity of the battery box (100).

10. An engineering machine, characterized in that: A battery pack comprising the battery pack of claim 9.

Images