CN117352934A - Battery box and method of making battery box - Google Patents

Abstract

This application provides a battery box and a manufacturing method of the battery box. The battery box includes at least two welded bottom plates. Each bottom plate is provided with a fourth cavity. The fourth cavity is used to circulate cooling liquid. Each bottom plate includes The first side wall is welded to the adjacent bottom plate, the first side wall has a set width W ₂ , the outermost bottom plate includes a second side wall spaced apart from the first side wall, the second side wall has a set width W ₃ , satisfying 2W ₂ ≥ W ₃ . The battery box of the present application can solve the problem of battery boxes in the prior art that are difficult to manufacture due to the high complexity of the battery box structure.

Description

Battery box and method of making battery box

Technical field

The present application relates to the field of energy storage technology, and in particular, to a battery box and a manufacturing method of the battery box.

Background technique

Energy storage battery is an essential component for storing electrical energy in a solar photovoltaic power generation system. Its main function is to store the electrical energy of the photovoltaic power generation system and provide power to the load when the amount of sunlight is insufficient, at night, and in emergency situations. Energy storage batteries are usually installed inside the battery box. However, the battery box in the prior art has a problem of high manufacturing difficulty due to the high complexity of the battery box structure.

Contents of the invention

In view of this, the present application provides a battery box and a manufacturing method of the battery box to help solve the problem in the prior art that battery boxes are difficult to manufacture due to the high complexity of the battery box structure.

In a first aspect, the present application provides a battery box. The battery box includes at least two welded bottom plates. Each bottom plate is provided with a fourth cavity. The fourth cavity is used for circulating cooling liquid. Each bottom plate includes a corresponding The first side wall welded adjacent to the bottom plate has a set width W ₂ , and the outermost bottom plate includes a second side wall spaced apart from the first side wall, and the second side wall has a set width W ₃ , Satisfies 2W ₂ ≥ W ₃ .

The structural plate located at the bottom of the battery box is used to fix and support the battery located inside the battery box. The structural plate with a large area is composed of at least two bottom plates with relatively small areas. Each bottom plate is provided with a fourth cavity, and the fourth cavity is used for circulating coolant. In detail, the cooling liquid located outside the battery box flows into the fourth cavity. Through heat conduction, the cooling liquid can absorb the heat generated by the battery installed on the bottom plate during operation. The cooling liquid that absorbs the heat then flows into the fourth cavity. The exterior of the base plate. By reciprocating the cooling fluid in the fourth cavity, the battery is allowed to operate within a normal temperature range, thereby increasing the service life of the battery. It can be seen from the above that the bottom plate is not only used as a part of the structural plate of the battery box so that the bottom plate has the function of fixing and supporting the battery. The fourth cavity built in the bottom plate can also be used to circulate coolant so that the bottom plate can also It can be used to achieve heat dissipation. Compared with a separate structural plate for fixing and supporting the battery and a separate heat dissipation plate for heat dissipation, the base plate and battery box provided by this application have a lower structural complexity. The base plate and battery box The production difficulty of the body is relatively low. Secondly, since the bottom plate in contact with the battery has an integrated heat dissipation function, the heat conduction path formed is shorter, and the heat of the battery can be quickly conducted to the coolant located in the bottom plate, resulting in high heat dissipation efficiency. Since the structural plate at the bottom of the battery box has a large area, if a larger-area structural plate is directly produced at one time using the existing manufacturing process, the structural strength and dimensional accuracy of the formed structural plate will be relatively poor. However, the structural plate at the bottom of the battery box of this application is formed by welding at least two bottom plates with a relatively small area. This arrangement allows at least two bottom plates with a relatively small area to be made first during the production process, using the existing manufacturing process. The structural strength and dimensional accuracy of each bottom plate produced are relatively high. The formed bottom plate is then welded to form the bottom structural plate required for the battery box. The structural strength and dimensional accuracy of the formed structural plate are also relatively high, which can Better meet actual use needs. Wherein, each bottom plate includes a first side wall, and the first side wall of each bottom plate is welded to the first side wall of the adjacent bottom plate, that is, the two welded first side walls serve as the connecting structure of the two bottom plates. The welding method has the advantages of high connection structure strength and high connection reliability. The outermost base plate also includes a second side wall, which is a structure used to meet the shape, size or structural strength of the base plate itself. The second side wall is not used for welding with another base plate. The first side wall has a set width W ₂ , and the second side wall also has a set width W ₃ , satisfying 2W ₂ ≥ _{W 3} . Under this setting, since the sum of the widths W ₂ of the two adjacent first side walls is large, the width of the fusion connection area between the two adjacent bottom plates is larger during the welding process. After welding, the width of the two adjacent bottom plates is larger. The width of the welded structure formed between the base plates is larger, the structural strength of the welded structure between two adjacent base plates is higher, and the degree of possibility of structural problems such as cracking, breakage or bending of the welded structure between two adjacent base plates Lower, correspondingly, a higher degree of operational reliability for structural panels consisting of at least two base plates welded together.

Optionally, 7mm≤W ₂ ≤10mm is satisfied, or 3mm≤W ₃ ≤8mm is satisfied.

Optionally, the base plate further includes a second top wall and a second bottom wall, the second top wall is connected to the second bottom wall through the first side wall and the second side wall, and the second top wall, the first side wall and the second The bottom wall is at least part of the structure used to enclose the fourth cavity. The connection between the side of any first side wall away from the adjacent first side wall and the corresponding second top wall includes a first The chamfered portion, and/or, the connection between the side of any first side wall away from the adjacent first side wall and the corresponding second bottom wall includes a second chamfered portion.

Optionally, the first chamfering part has a chamfering circle structure, and the first chamfering part has a set radius R ₁ that satisfies 1mm ≤ R ₁ ≤ 3mm; and/or the second chamfering part has a chamfering circle structure. , the second chamfer portion has a set radius R ₂ that satisfies 1 mm ≤ R ₂ ≤ 3 mm.

Optionally, there is a set height H ₂ between the second top wall and the second bottom wall, satisfying 5 mm ≤ H ₂ ≤ 8 mm.

Optionally, the bottom plate further includes a support portion located in the fourth cavity, and the second bottom wall is connected to the second top wall through the support portion.

Optionally, the support part has a set height H ₃ , which satisfies 5 mm ≤ H ₃ ≤ 8 mm, and/or the support part has a set width W ₄ , which satisfies 3 mm ≤ W ₄ ≤ 5 mm.

Optionally, the connection between the support part and the second top wall includes a third chamfered part, and/or the connection between the support part and the second bottom wall includes a fourth chamfered part.

Optionally, the third chamfering part has a chamfering circle structure, and the third chamfering part has a set radius R ₃ that satisfies 1mm ≤ R ₃ ≤ 3mm; and/or the fourth chamfering part has a chamfering circle structure. , the fourth chamfer portion has a set radius R ₄ that satisfies 1mm ≤ R ₄ ≤ 3mm.

Optionally, the support part is a plate-like structure, and the fourth cavity is separated by the support part to form at least two parallel and connected flow channels.

Optionally, the cross-sectional shape of the flow channel is rectangular, circular, semicircular, elliptical or hexagonal.

Optionally, the bottom plate further includes at least two partitions located in the same flow channel, the partitions are parallel to the plate-shaped support portion, and each partition plate located in the same flow channel is spaced apart along the flow guide direction of the flow channel.

Optionally, each bottom plate is distributed along the width direction or length direction of the battery box, and the fourth cavities of each bottom plate are connected. One of the outermost bottom plates is provided with a liquid inlet, and the other outermost bottom plate is provided with a liquid outlet. .

Optionally, the battery box also includes a liquid inlet connecting pipe and a liquid outlet connecting pipe. The liquid inlet connecting pipe is connected to the liquid inlet. The liquid inlet connecting pipe is sealingly connected to the bottom plate provided with the liquid inlet. The liquid outlet connecting pipe is connected to the outlet. The liquid port is connected, and the liquid outlet connecting pipe is sealingly connected to the bottom plate provided with the liquid outlet; the liquid inlet connecting pipe and the liquid outlet connecting pipe are used to communicate with the corresponding external guide pipe.

Optionally, the bottom plate is provided with a fifth opening communicating with the fourth cavity, and the battery box further includes a first blocking member blocking the fifth opening.

Optionally, the battery box also includes side plates, each bottom plate is distributed along the width direction or length direction of the battery box, and the outermost bottom plate and the side plate are integrally formed or welded.

A second aspect of this application provides a method for manufacturing a battery box, which method includes:

Step S1: Use one-piece molding process to make connected side panels and bottom panels;

Step S2: Use friction welding process to weld at least two base plates.

The one-piece molding process is used to produce the connected outermost bottom plate and side panels. The one-piece molding process has the advantage of reducing the number of molds and improving production efficiency. It also has the advantage of improving the structural strength and dimensional accuracy between the outermost bottom plate and side panels. The advantages. The one-piece molding process can be made by casting process, extrusion molding process or injection molding process. The first side walls of at least two base plates are welded using a friction welding process. In detail, high-speed friction is used to increase the temperature of the first side wall of the bottom plate until at least part of the first side wall is melted, and then the melted parts of the first side walls of the two bottom plates are welded, and the first side wall is After the walls have cooled, a welded structure is formed between the first side walls of the two base plates. Since no other material is required to assist welding during the welding process, the material of the welded structure between the first side walls of the two bottom plates is the same as the material of the bottom plate, that is, the structural strength of the welded structure between the first side walls of the two bottom plates is The structural strength of the bottom plate is the same, and the resulting structural plate located at the bottom of the battery box has a high degree of operational reliability. Among them, the first side walls of the two bottom plates can be rubbed against each other at high speed, or the curved side walls of the high-speed rotating cylinder can be used to rub the first side walls of the two bottom plates at the same time until the first side walls of the two bottom plates are at least partially melted, and then the melted portions of the first side walls of the two bottom plates are fused.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without exerting creative labor.

Figure 1 is a schematic three-dimensional structural diagram of the battery box provided by the present application in a specific embodiment;

Figure 2 is a schematic diagram of the exploded structure of the battery box in Figure 1;

Figure 3 is a partially enlarged schematic diagram of part A in Figure 2;

Figure 4 is a schematic structural diagram of the bottom plate and side plates;

Figure 5 is a partially enlarged schematic diagram of part B in Figure 4;

Figure 6 is a schematic structural diagram of a hook in a specific embodiment;

Figure 7 is a cross-sectional view of the bottom plate and side plates in Figure 2 along the C-C direction;

Figure 8 is a partially enlarged schematic diagram of part D in Figure 7;

Figure 9 is a schematic structural diagram of the I-shaped rib portion in Figure 8;

Figure 10 is a schematic structural diagram of part E in Figure 7;

Figure 11 is a cross-sectional view of the bottom plate, the first blocking member and the second blocking member in Figure 2 along the F-F direction;

Figure 12 is a schematic diagram of the exploded structure of the two base plates;

Figure 13 is a schematic diagram of the explosion structure of three base plates;

Figure 14 is a partial enlarged schematic diagram of part G in Figure 12;

Figure 15 is a schematic structural diagram of the first blocking member in a specific embodiment;

Figure 16 is a schematic structural diagram of the first blocking member in another specific embodiment;

Figure 17 is a partial enlarged schematic diagram of part H in Figure 12;

Figure 18 is a schematic structural diagram of the second blocking member in a specific embodiment;

Figure 19 is a flow chart of a specific embodiment of the manufacturing method of a battery box provided by this application.

10-battery box;

1-side panel;

1a-lateral wall;

1b-top;

1c-bottom;

1d-I-shaped rib;

11-Chute;

111-First top wall;

112-medial wall;

113-First bottom wall;

12-suspended hole;

13-First cavity;

14-First opening;

15-Second cavity;

16-Second opening;

17-Third cavity;

18-Third opening;

181-First chamfer circle structure;

19-Fourth opening;

191-Second chamfer circle structure;

2-Bottom;

21a-Fourth cavity;

211-flow channel;

21b-fifth cavity;

22a-first side wall;

221-First chamfer part;

222-Second chamfer part;

22b-second side wall;

22c-support part;

223-The third chamfer part;

224-The fourth chamfer part;

22d-partition;

22e-Third side wall;

23a-Second top wall;

23b-Second bottom wall;

24a-Liquid inlet;

24b-liquid outlet;

25a-fifth opening;

25b-sixth opening;

25c-seventh opening;

26-First through hole;

3-Front plate;

4-Back plate;

5-upper cover;

6-Liquid inlet connecting pipe;

7-Discharge connecting pipe;

8-The first sealing piece;

81-Protrusion;

82-interval space;

9-Second blocking piece;

91-Second through hole;

20-hook;

201-The outer arc surface of the bending part;

202-Inner arc surface of the bending part.

Detailed ways

In order to better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

The terminology used in the embodiments of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. As used in the embodiments and the appended claims, the singular forms "a," "the" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" used in this article is only an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and A exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

Referring to FIG. 1 , the first aspect of the embodiment of the present application provides a battery box 10 . The battery box is used to store batteries (not shown in the figure) inside, and the battery box is used to protect the batteries. In actual use, the battery box can be stored in a fixed device such as a bracket, box or cabinet. Referring to FIG. 2 , the battery box 10 includes a side plate 1 , a bottom plate 2 , a front plate 3 , a rear plate 4 and an upper cover 5 . The two side plates 1 are connected to the bottom plate 2, the two side plates 1 are arranged oppositely, the front plate 3 is connected to the bottom plate 2, the rear plate 4 is connected to the bottom plate 2, the front plate 3 and the rear plate 4 are arranged oppositely, the side plate 1 and the front plate At least two of the side panels 3 and the rear panel 4 are connected to the upper cover 5. The side panel 1, the bottom panel 2, the front panel 3, the rear panel 4 and the upper cover 5 form a space for accommodating the battery. The following content of this article first introduces the structure of side plate 1, and then introduces the structure of bottom plate 2. The directions X, Y and Z described in this article are perpendicular to each other. The dotted lines in the drawings of this article are structural dividing lines.

Referring to FIG. 3 , the side plate 1 is provided with an inwardly recessed slide groove 11 , and the slide groove 11 is used to slidely cooperate with the slide rail (not shown in the figure). Please refer to Figures 4 and 5. The side wall of the side plate 1 used to enclose the chute 11 is provided with a lifting hole 12. The lifting hole 12 is used to be penetrated by the hanging hook 20 as shown in Figure 6. The side plate 1 is used to connect with the hook 20 .

Referring to Figure 3, the side plate 1 of the battery box 10 can be provided with an inwardly recessed slide groove 11. The fixing device (not shown in the figure) for storing the battery box 10 can include a slide rail and a slide groove. 11 can be slidably matched with the slide rail. This assembly method is convenient for the battery box 10 to be quickly installed on the fixed device in a sliding manner, and the assembly efficiency is high; of course, this assembly method is also convenient for the battery box 10 to be quickly installed in a sliding manner. The ground is separated from the fixing device, and the disassembly efficiency is high. Please refer to Figures 4 and 5. The side plate 1 of the battery box 10 is also provided with a lifting hole 12. The lifting hole 12 is used for the hook 20 of the hoisted device (such as a crane, overhead crane or crane, etc.). (shown in Fig. 6) is inserted so that the side plate 1 is connected to the hook 20, so that the hook 20 of the lifting device can quickly move the battery box 10. For example, the hook 20 can move the battery box 10 to a position where the chute 11 is aligned with the slide rail, so that the chute 11 and the slide rail are slidingly matched, or the hook 20 can move the battery box 10 from the fixture. to other locations. Since the lifting hole 12 is provided in the side plate 1 for enclosing the side wall of the chute 11, this arrangement makes the structure between the chute 11 and the lifting hole 12 more compact. The size of the structure of the slot 11 and the lifting hole 12 (for example, the size along the direction The battery box 10 occupies relatively little space in the fixture, so that a relatively large number of battery boxes 10 can be stored in the fixture space, and the loading rate is high; accordingly, the weight of the side plate 1 is relatively small, making it easier to transport the battery box. Body 10 consumes less energy.

As shown in FIG. 4 , the chute 11 can be disposed along the length direction of the side plate 1 (the direction parallel to the direction Y).

In addition, please refer to FIGS. 7-8 . The shape of the cross section perpendicular to the direction Y of the chute 11 may be a polygon such as a rectangle or an isosceles trapezoid.

Furthermore, the embodiment of the present application does not limit the shape and number of suspension holes 12 .

Optionally, please refer to Figure 8. The chute 11 is provided on the outer side wall 1a of the side plate 1 along the height direction of the battery box 10 (direction parallel to the direction X). Correspondingly, the fixing device (not shown in the figure) The slide rail shown) is also provided in the side wall structure of the fixing device along the height direction of the fixing device (the direction parallel to the direction More simplified. Since the outer wall 1a belongs to the structure of the battery box 10 from a common perspective, the chute 11 is easy for the user to observe, so that the user can quickly and accurately make the chute 11 and the slide rail slide together; similarly, the lifting hole 12 is also convenient for the user to It is observed by the user so that the user can quickly and accurately insert the hook 20 into the lifting hole 12 . Therefore, the above structural arrangement can improve the assembly efficiency and assembly accuracy of the battery box 10 . The lifting hole 12 is provided in the side plate 1 for enclosing the top wall 111 forming the chute 11. Under the gravity of the battery box 10, the hanging hook 20 cannot easily detach from the lifting hole 12. Therefore, the battery box 10 and The connection reliability of the hook 20 is relatively high.

In other embodiments (not shown in the figure), the bottom wall of the side plate 1 may be provided with a chute 11 and a lifting hole 12 . The following content of this article mainly takes the example that the outer wall 1a of the side plate 1 is provided with the chute 11 and the lifting hole 12.

Optionally, please refer to Figure 8. The top 1b of the side plate 1 is also provided with a first cavity 13. The first cavity 13 is connected to the chute 11 through the lifting hole 12. The first cavity 13 is used to accommodate the hoist. At least part of hook 20.

Part of the structure of the hook 20 shown in FIG. 6 can be moved into the first cavity 13 through the chute 11 and the lifting hole 12 shown in FIG. 8 , so that the hook 20 is connected to the side plate 1 . Under this arrangement, the space inside the side panel 1 for accommodating the part of the hook 20 is larger, and there are more locations for connecting the hook 20 in the internal structure of the side panel 1. The connecting area of the hook 20 is relatively large, and the position connected to the hook 20 in the internal structure of the side plate 1 is located in the inner position of the side plate 1. Correspondingly, the length of the structure of the hook 20 located inside the side plate 1 or The volume can be larger, and the structural strength of the hook 20 is larger, so that the connection reliability between the side plate 1 and the hook 20 is higher. The arrangement of the first cavity 13 also makes the weight 1 of the battery box 10 relatively small, and the energy consumption of transporting the battery box 10 is also relatively small.

As shown in FIG. 8 , the first cavity 13 may be disposed along the length direction of the side plate 1 (the direction parallel to the direction Y).

In addition, please refer to FIG. 8 , the shape of the cross section perpendicular to the direction Y of the first cavity 13 may be a polygon such as a rectangle.

Optionally, please refer to Figure 8. The side of the side plate 1 away from the chute 11 is also provided with a second cavity 15. The side plate 1 is provided with a first opening 14. The first opening 14 is connected to the lifting hole 12. , the second cavity 15 communicates with the chute 11 through the first opening 14 , and the second cavity 15 communicates with the first cavity 13 through the first opening 14 .

Part of the structure of the hook 20 as shown in Figure 6 can be located in the first opening 14 and the second cavity 15 as shown in Figure 8. In this arrangement, the portion of the inside of the side plate 1 used to accommodate the hook 20 The space of the structure is larger. There are more positions for connecting the hook 20 in the internal structure of the side panel 1. The area connected to the hook 20 in the internal structure of the side panel 1 is larger. Correspondingly, the hook 20 is located in the side panel. The length or volume of the internal structure of 1 can be larger, and the structural strength of the hook 20 is greater, so that the connection reliability between the side plate 1 and the hook 20 is higher. The arrangement of the second cavity 15 makes the weight 1 of the battery box 10 smaller, and the energy consumption of transporting the battery box 10 is also lower.

As shown in FIG. 8 , the second cavity 15 may be disposed along the length direction of the side plate 1 (the direction parallel to the direction Y).

In addition, please refer to FIG. 8 , the shape of the cross section perpendicular to the direction Y of the second cavity 15 may be a polygon such as a rectangle.

Optionally, please refer to 8, the bottom 1c of the side plate 1 is also provided with a third cavity 17, the side plate 1 is provided with a second opening 16, the second opening 16 is connected with the first opening 14, and the second opening 16 Also connected to the chute 11 , the third cavity 17 is connected to the second cavity 15 through the second opening 16 , and the third cavity 17 is connected to the chute 11 through the second opening 16 .

Part of the structure of the hook 20 as shown in Figure 6 can be located in the second opening 16 and the third cavity 17 as shown in Figure 8. In this arrangement, the portion of the interior of the side plate 1 used to accommodate the hook 20 The space of the structure is larger. There are more positions for connecting to the hook 20 in the internal structure of the side panel 1. The area connected to the hook 20 in the internal structure of the side panel 1 is larger. Correspondingly, there are more places in the internal structure of the side panel 1 to connect to the hook 20. The length or volume of the structure located inside the side plate 1 is greater, and the structural strength of the hook 20 is greater, so that the connection reliability between the side plate 1 and the hook 20 is even higher. The provision of the third cavity 17 makes the weight 1 of the battery box 10 smaller, and the energy consumption of transporting the battery box 10 is smaller.

As shown in FIG. 8 , the third cavity 17 may be disposed along the length direction of the side plate 1 (direction parallel to the direction Y).

In addition, please refer to FIG. 8 , the shape of the cross section perpendicular to the direction Y of the third cavity 17 may be a polygon such as a rectangle.

Optionally, please refer to Figure 8. The outer side wall 1a of the side plate 1 is provided with a third opening 18. The third opening 18 is connected with the second opening 16. The third opening 18 is used to avoid the hoist as shown in Figure 6. The outer arc surface 201 of the bent portion of the hook 20.

At least part of the outer arc surface 201 of the bending portion of the hook 20 as shown in FIG. 6 can be moved to the chute 11 or other internal spaces of the side plate 1 via the third opening 18 as shown in FIG. 8 , thereby facilitating the lifting of the hook. Part of the structure of 20 is connected to the internal structure of the side plate 1. The setting of the third opening 18 can reduce the possibility of the structure of the hook 20 and the side plate 1 getting stuck during the connection process, and facilitate the user to quickly connect the hook 20. and side panel 1.

5, the surface of the outer side wall 1a of the side plate 1 used to enclose the third opening 18 includes a first chamfered circle structure 181. The arrangement of the first chamfered circle structure 181 can lower the side wall. The degree of stress concentration in the structure used to form the third opening 18 in 1. Therefore, the structure used to form the third opening 18 in the side panel 1 is less likely to suffer from cracking problems.

In addition, the embodiment of the present application does not limit the shape and area of the third opening 18 .

Optionally, as shown in FIG. 8 , the side plate 1 includes an I-shaped rib portion 1 d to form a first cavity 13 , a second cavity 15 , a third cavity 17 and a slide groove 11 . Under this arrangement, not only the weight of the side panel 1 is relatively small, but also the structural strength of the side panel 1 is high, and the possibility of structural problems such as bending deformation of the side panel 1 is small. The lifting hole 12, the first opening 14 and the second opening 16 are provided in the I-shaped rib portion 1d to form the chute 11, the lifting hole 12, the first cavity 13, the first opening 14, the second cavity 15, the second The opening 16 and the third cavity 17 are interconnected, so that part of the structure of the hook 20 can be located respectively in the chute 11, the lifting hole 12, the first cavity 13, the first opening 14, the second cavity 15, and the third cavity 17. In the second opening 16 and the third cavity 17, the above-mentioned technical effect of improving the reliability of the connection between the side plate 1 and the hook 20 is achieved, which will not be described again here.

As shown in FIG. 8 , a part of the first opening 14 is provided in the structure between the first cavity 13 and the second cavity 15 in the side plate 1 , and the other part of the first opening 14 is provided in the side plate 1 The structure located between the second cavity 15 and the chute 11 .

In addition, please refer to FIG. 9 , the I-shaped rib portion 1 d includes a first top wall 111 , an inner side wall 112 and a first bottom wall 113 for enclosing and forming the chute 11 . The first top wall 111 is used to separate the chute 11 and the first cavity 13 , the inner wall 112 is used to separate the chute 11 and the second cavity 15 , and the first bottom wall 113 is used to separate the chute 11 and the third cavity. 17.

Optionally, please refer to Figure 8. The outer side wall 1a of the side plate 1 is provided with a fourth opening 19. The fourth opening 19 is connected to the lifting hole 12. The fourth opening 19 is used to avoid the hanging hook as shown in Figure 6. The inner arc surface 202 of the bending part 20.

At least part of the inner arc surface 202 of the bending portion of the hook 20 as shown in FIG. 6 can be moved to the chute 11 or other internal spaces of the side plate 1 via the fourth opening 19 as shown in FIG. 8 , thereby facilitating the hook 20 Part of the structure is connected to the internal structure of the side panel 1. The provision of the fourth opening 19 can reduce the possibility of the structure of the hook 20 and the side panel 1 getting stuck during the connection process, and facilitate the user to quickly connect the hook 20 and the side panel 1. Side panels 1.

5, the surface of the outer side wall 1a of the side plate 1 for enclosing the fourth opening 19 includes a second chamfered circle structure 191. The arrangement of the second chamfered circle structure 191 can lower the side wall. The degree of stress concentration of the structure used to form the fourth opening 19 in 1. Therefore, the structure used to form the fourth opening 19 in the side panel 1 is less likely to suffer from cracking problems.

The above-mentioned number of the first opening 14 , the second opening 16 , the third opening 18 and the fourth opening 19 is the same as the number of the lifting holes 12 , that is, each lifting hole 12 corresponds to the first opening 14 , the second opening 16 , The third opening 18 and the fourth opening 19.

Optionally, please refer to Figure _{8. The} chute 11 has a set width W ₁ (dimension along the direction 13mm, 14mm, 15mm.

Please refer to Figure 8. If _W1 is less than 10mm, the width _W1 of the slide groove 11 is smaller. Correspondingly, the width of the slide rail of the fixing device (not shown in the figure) is also smaller, and the structural strength of the slide rail is smaller. Low, so that the connection reliability between the battery box 10 and the fixing device is low. If the width W ₁ of the chute 11 is greater than 15 mm, the width W ₁ of the chute 11 is larger, the height of the side plate 1 (dimension along the direction The fixed device has more space, and the number of battery boxes 10 stored in the fixed device is small, that is, the loading rate is low; the weight of the side plate 1 is also large, and the energy consumption of transporting the battery boxes 10 is high. Therefore, the width W ₁ of the chute 11 is preferably in the range of 10 mm to 15 mm.

Optionally, please refer to Figure 8. The chute 11 has a set depth H ₁ (dimension along direction Z) that satisfies 8mm ≤ H ₁ ≤ 12mm, where H ₁ can specifically be 8mm, 9mm, 10mm, 11mm, 12mm.

Please refer to Figure 8. If _H1 is less than 8mm, the depth _H1 of the chute 11 is small, and the space of the chute 11 for accommodating the slide rail of the fixing device (not shown in the figure) is less, and the slide rail is easy to Without the chute 11 , the sliding fit between the chute 11 and the slide rail is prone to failure, that is, the connection between the battery box 10 and the fixing device is prone to failure. If H ₂ is greater than 12 mm, the depth H ₁ of the chute 11 is deeper, the structural strength of the side plate 1 is lower, and the side plate 1 is prone to deformation and other structural problems. Therefore, the depth H ₁ of the chute 11 is preferably in the range of 8 mm to 12 mm.

The following content of this article introduces the structure of base plate 2.

Referring to Figure 2, the structural plate located at the bottom of the battery box 10 is used to fix and support the battery (not shown in the figure) located inside the battery box 10. This structural plate with a large area is composed of at least two areas facing each other. Consists of 2 smaller base plates. Referring to FIGS. 10 and 11 , each bottom plate 2 is provided with a fourth cavity 21 a , and the fourth cavity 21 a is used to circulate cooling liquid (not shown in the figures). In detail, the cooling liquid located outside the battery box 10 flows into the fourth cavity 21a. Through heat conduction, the cooling liquid can absorb the heat generated by the battery (not shown in the figure) disposed on the bottom plate 2 during the operation. The heat is absorbed by the cooling liquid and then flows to the outside of the base plate 2 . By reciprocating the cooling fluid in the fourth cavity 21a, the battery is allowed to operate within a normal temperature range, thereby increasing the service life of the battery. It can be seen from the above that the bottom plate 2 is not only used as a part of the structural plate of the battery box 10 so that the bottom plate 2 has the function of fixing and supporting the battery. The fourth cavity 21a built in the bottom plate 2 can also be used to circulate coolant. , so that the bottom plate 2 can also be used to achieve heat dissipation. Compared with a separate structural plate for fixing and supporting the battery and a separate heat dissipation plate for heat dissipation, the bottom plate 2 and the battery box 10 provided by the embodiment of the present application are The structural complexity is low, and the production of the base plate 2 and the battery box 10 is relatively low. Secondly, since the bottom plate 2 in contact with the battery has an integrated heat dissipation function, the heat conduction path formed is shorter, and the heat of the battery can be quickly conducted to the coolant located in the bottom plate 2, resulting in high heat dissipation efficiency. Since the structural plate at the bottom of the battery box 10 has a large area, if a larger-area structural plate is directly produced at one time using existing manufacturing processes, the structural strength and dimensional accuracy of the formed structural plate will be relatively poor. However, the structural plate at the bottom of the battery box 10 in the embodiment of the present application is formed by welding at least two bottom plates 2 with relatively small areas. This arrangement allows at least two bottom plates 2 with relatively small areas to be made first during the production process. The structural strength and dimensional accuracy of each bottom plate 2 produced by the existing manufacturing process are relatively high. The formed bottom plate 2 is then welded to form the bottom structural plate required for the battery box 10. The structural strength and dimensional accuracy of the formed structural plate are The dimensional accuracy is also relatively high, which can better meet the needs of actual use. Wherein, each bottom plate 2 includes a first side wall 22a, and the first side wall 22a of each bottom plate 2 is welded to the first side wall 22a of the adjacent bottom plate 2, that is, the two welded first side walls 22a serve as two The connection structure of base plate 2. The welding method has the advantages of high connection structure strength and high connection reliability. Please refer to Figure 8, the outermost base plate 2 also includes a second side wall 22b. The second side wall 22b is used as a structure to meet the shape, size or structural strength of the base plate 2 itself. The second side wall 22b is not used for Welded with another base plate 2. The first side wall 22a has a set width W ₂ (dimension along direction Z), and the second side wall 22b also has a set width W ₃ (dimension along direction Z), satisfying 2W ₂ ≥ _{W 3} . In this setting, since the sum of the widths W ₂ of the two adjacent first side walls 22 a is larger, the width of the fusion connection area between the two adjacent bottom plates 2 is larger during the welding process. The width of the welded structure formed between adjacent base plates 2 is relatively large, and the structural strength of the welded structure between two adjacent base plates 2 is relatively high. The welded structure between two adjacent base plates 2 may crack, break or bend. The degree of possibility of problems is low and accordingly the degree of operational reliability of a structural panel consisting of at least two base plates 2 welded is high.

12, if the structural plate at the bottom of the battery box 10 is composed of two bottom plates 2, then each bottom plate 2 includes a first side wall 22a and a second side wall 22b arranged at intervals. The side wall 22a is welded, the second side wall 22b is not used for welding, and the fourth cavity 21a is located between the first side wall 22a and the second side wall 22b. Referring to FIG. 13 , if the structural plate at the bottom of the battery box 10 is composed of at least three bottom plates 2 , the at least three bottom plates 2 are distributed along the width direction of the battery box 10 (direction parallel to the direction Z). The outermost bottom plate 2 may include a first side wall 22a and a second side wall 22b that are spaced apart, and the corresponding fourth cavity 21a is located between the first side wall 22a and the second side wall 22b; located in the middle of the two bottom plates 2 The bottom plate 2 includes two spaced apart first side walls 22a, and the corresponding fourth cavity 21a is located between the two first side walls 22a. The two first side walls 22a between each two adjacent bottom plates 2 are welded, and the second side walls 22b are not used for welding.

In other embodiments (not shown in the figure), at least three bottom plates 2 are distributed along the length direction of the battery box 10 (the direction parallel to the direction Y).

Optionally, please refer to Figure 8 to satisfy 3mm≤W ₃ ≤8mm. The width W ₃ can specifically be 3mm, 4mm, 5mm, 6mm, 7mm or 8mm.

Please refer to FIG. 8 . If the width W ₃ of the second side wall 22 b is less than 3 mm, the width of the second side wall 22 b is too small, and the structural strength of the second side wall 22 b is low, and it is easy to crack, break or bend. and other structural issues. If the width _W3 of the second side wall 22b is greater than 10 mm, the width of the second side wall 22b is too large. Under the condition that the size of the single bottom plate 2 along the direction Z is limited and the distance between the second side wall 22b and the first side wall 22a Under the condition that the distance between them is limited, the size of the fourth cavity 21a along the direction Z is relatively small, the amount of cooling liquid that the fourth cavity 21a can accommodate is relatively small, and the heat dissipation efficiency is poor. Therefore, the width W ₂ of the first side wall 22a is preferably in the range of 3 mm to 8 mm.

Optionally, please refer to Figure 10 to satisfy 7mm ≤ W ₂ ≤ 10mm. The width W ₂ can specifically be 7mm, 8mm, 9mm or 10mm.

Please refer to FIG. 10 . If the width W ₂ of the first side wall 22 a is less than 7 mm, the width of the first side wall 22 a is too small, and the width of part of the welding structure used to form the bottom plate 2 is small. The resulting welding structure The structural strength is low, and the resulting welded structure is prone to structural problems such as cracking, fracture, and bending deformation. If the width W ₂ of the first side wall 22 a is greater than 10 mm, the width of the first side wall 22 a is too large. Under the condition that the size of the single bottom plate 2 along the direction Z is limited, the size of the fourth cavity 21 a along the direction Z is relatively small. Small, the amount of cooling liquid that the fourth cavity 21a can hold is relatively small, resulting in poor heat dissipation efficiency. Therefore, the width W ₂ of the first side wall 22a is preferably in the range of 7 mm to 10 mm.

Optionally, please refer to Figure 10, the base plate 2 also includes a second top wall 23a and a second bottom wall 23b, the second top wall 23a is connected to the second bottom wall through the first side wall 22a and the second side wall 22b. 23b, the second top wall 23a, the first side wall 22a and the second bottom wall 23b are at least part of the structure used to enclose the fourth cavity 21a. In this arrangement, the structure of the base plate 2 is less complex and easy to manufacture.

If the structural plate at the bottom of the battery box 10 is composed of two bottom plates 2, each bottom plate 2 also includes a second side wall 22b spaced apart from the first side wall 22a, and the second top wall 23a is also connected to the second top wall 23a through the second side wall 22b. The second bottom wall 23b is connected. The second top wall 23a, the first side wall 22a, the second bottom wall 23b and the second side wall 22b serve as structures for enclosing and forming the fourth cavity 21a.

If the structural plate at the bottom of the battery box 10 is composed of at least three bottom plates 2, the outermost bottom plate 2 also includes a second side wall 22b spaced apart from the first side wall 22a, and the second top wall 23a also passes through the second side wall. 22b is connected to the second bottom wall 23b. The second top wall 23a, the first side wall 22a, the second bottom wall 23b and the second side wall 22b serve as structures for enclosing and forming the corresponding fourth cavity 21a; located on both sides The bottom plate 2 in the middle of the two bottom plates 2 includes two spaced apart first side walls 22a. The second top wall 23a is connected to the second bottom wall 23b through two spaced apart first side walls 22a. The first side walls 22a, The second bottom wall 23b and the two second side walls 22b serve as structures for enclosing and forming the corresponding fourth cavity 21a.

The second top wall 23a is used to fix and support the battery (not shown in the figure). The battery box 10 may also include thermally conductive glue disposed between the second top wall 23a and the battery. The adhesive is connected to the battery, and the thermally conductive adhesive can quickly conduct the heat of the battery to the second top wall 23a.

In addition, the material of the second top wall 23a can be metal, which has higher heat conduction efficiency. The second top wall 23a can quickly conduct heat to the cooling liquid located in the fourth cavity 21a.

Furthermore, the battery box may also include a heat-absorbing layer (not shown in the figure) disposed in the second top wall 23a facing away from the second bottom wall 23b. The material of the heat-absorbing layer may be a carbonitriding layer, a nitrogen-oxygen layer, or a carbonitriding layer. Co-infiltrated layer, carbon-oxygen co-infiltrated layer or carbon-oxygen co-infiltrated layer, any of the above-mentioned materials can make at least part of the color of the heat-absorbing layer black or a deep color close to black. Compared with other colors (such as silvery white of stainless steel or aluminum), the heat-absorbing layer with a black appearance or a deep color close to black has a higher efficiency in absorbing thermal radiation electromagnetic waves, and the appearance is black or a deep color close to black. The heat-absorbing layer can absorb a large frequency range of thermal radiation electromagnetic waves. Therefore, the heat-absorbing layer can quickly and massively absorb the thermal radiation electromagnetic waves generated by the battery during operation. That is, the heat-absorbing layer uses the principle of thermal radiation to quickly absorb the heat of the battery, and the second top wall 23a in contact with the heat-absorbing layer then The heat absorbed by the heat-absorbing layer is conducted to the cooling liquid located in the fourth cavity 21a.

Optionally, please refer to FIG. 10 , the connection between the side of any first side wall 22 a away from the adjacent first side wall 22 a and the corresponding second top wall 23 a includes a first chamfer 221 The provision of the first chamfer 221 can reduce the stress concentration at the connection between the first side wall 22a and the second top wall 23a, and reduce the occurrence of cracking and cracking at the connection between the first side wall 22a and the second top wall 23a. The degree of possibility of structural problems such as breakage or deformation.

Optionally, please refer to FIG. 10 , the connection between the side of any first side wall 22 a away from the adjacent first side wall 22 a and the corresponding second bottom wall 23 b includes a second chamfer 222 , the provision of the second chamfer 222 can reduce the stress concentration at the connection between the first side wall 22a and the second bottom wall 23b, and reduce the occurrence of cracking and cracking at the connection between the first side wall 22a and the second bottom wall 23b. The degree of possibility of structural problems such as breakage or deformation.

Optionally, please refer to FIG. 10 . The first chamfer portion 221 has a chamfer circle structure, and the first chamfer portion 221 has a set radius R ₁ that satisfies 1 mm ≤ R ₁ ≤ 3 mm. The radius R ₁ may specifically be 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

Please refer to FIG. 10 . If the radius R ₁ is less than 1 mm, the radius R ₁ of the first chamfer 221 is smaller. On the one hand, the stress concentration at the connection between the first side wall 22 a and the second top wall 23 a is relatively large. High, the connection between the first side wall 22a and the second top wall 23a is prone to structural problems such as cracking, fracture or deformation; on the other hand, under the condition of ensuring dimensional accuracy, the first chamfer with a smaller radius R ₁ Part 221 is more difficult to produce. If the radius R ₁ is greater than 3 mm, the radius R ₁ of the first chamfer 221 is relatively large, and the volume of the connection between the first side wall 22 a and the second top wall 23 a is relatively large. When the volume of the single bottom plate 2 remains unchanged, Under the conditions, the volume of the fourth cavity 21a is relatively small, the amount of cooling liquid that the fourth cavity 21a can hold is small, and the heat dissipation efficiency is poor. Therefore, the radius R ₁ is preferably in the range of 1 mm to 3 mm.

In other embodiments (not shown in the figure), the first chamfer portion 221 may be a right-angle structure.

Optionally, please refer to FIG. 10 . The second chamfering part 222 has a chamfering circle structure, and the second chamfering part 222 has a set radius R ₂ that satisfies 1 mm ≤ R ₂ ≤ 3 mm. The radius R ₂ can specifically be 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

Please refer to FIG. 10 . If the radius R ₂ is less than 1 mm, the radius R ₂ of the second chamfer 222 is smaller. On the one hand, the stress concentration at the connection between the first side wall 22 a and the second bottom wall 23 b is relatively large. High, the connection between the first side wall 22a and the second bottom wall 23b is prone to structural problems such as cracking, fracture or deformation; on the other hand, under the condition of ensuring dimensional accuracy, the second chamfer with a smaller radius R ₂ Part 222 is more difficult to produce. If the radius R ₂ is greater than 3 mm, the radius R ₂ of the second chamfered portion 222 is larger, and the volume of the connection between the first side wall 22 a and the second bottom wall 23 b is relatively large, and the volume of the single bottom plate 2 remains unchanged. Under the conditions, the volume of the fourth cavity 21a is relatively small, the amount of cooling liquid that the fourth cavity 21a can hold is small, and the heat dissipation efficiency is poor. Therefore, the radius _R2 is preferably in the range of 1 mm to 3 mm.

In other embodiments (not shown in the figure), the second chamfer portion 222 may have a right-angle structure.

Optionally, please refer to Figure 10. There is a set height H ₂ between the second top wall 23a and the second bottom wall 23b, which satisfies _{5mm≤H2≤8mm} . The height H ₂ can specifically be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm.

Please refer to Figure 10, if the height _H2 is less than 5mm, the height of the fourth cavity 21a located between the second top wall 23a and the second bottom wall 23b is relatively small, and the cooling capacity that the fourth cavity 21a can accommodate The amount of liquid is small, and the heat dissipation efficiency is poor; if the height H ₂ is greater than 8 mm, the thickness of the bottom plate 2 is relatively large, the weight of the battery box 10 is also relatively large, and the energy consumption of moving the battery box 10 is large. Therefore, the height H ₂ is preferably in the range of 5 mm to 8 mm.

Optionally, please refer to FIG. 10 , the bottom plate 2 further includes a support portion 22c located in the fourth cavity 21a, and the second bottom wall 23b is connected to the second top wall 23a through the support portion 22c. Under this arrangement, the support portion 22c plays a role in improving the structural strength of the bottom plate 2, and the possibility of structural problems such as bending deformation, cracking or breakage of the second top wall 23a and the second bottom wall 23b is low.

The supporting part 22c may be rod-shaped, columnar, plate-shaped or disk-shaped. The following content of this article will mainly take the plate-shaped supporting part 22c as an example. The embodiment of the present application also does not limit the number of supporting parts 22c.

Optionally, please refer to FIG. 10 . The support portion 22c has a set height H ₃ (dimension parallel to the direction X), which satisfies 5 mm ≤ H ₃ ≤ 8 mm. Among them, the height H ₃ can be specifically 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm.

Please refer to Figure 10. The height _H2 between the second top wall 23a and the second bottom wall 23b is the same as the height _H3 of the support portion 22c. The technical effects brought about by setting the numerical range of the height _H3 include the above. The technical effects brought about by setting the numerical range of the height H ₂ described will not be described again here.

Optionally, please refer to FIG. 10 . The support portion 22c has a set width W ₄ (dimension parallel to the direction Z), which satisfies 3mm ≤ W ₄ ≤ 5mm. Among them, the width W ₄ can be specifically 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

Please refer to FIG. 10 . If the width W ₄ of the support part 22 c is less than 3 mm, the structural strength of the support part 22 c is low, and the effect of the support part 22 c on improving the structural strength of the bottom plate 2 is poor. The second top wall 23 a The possibility of structural problems such as bending deformation, cracking or breakage with the second bottom wall 23b is relatively high. If the width W ₄ of the support part 22c is greater than 5 mm, the support part 22c occupies a relatively large space in the fourth cavity 21a, so that the amount of cooling liquid that the fourth cavity 21a can accommodate is relatively small, and the heat dissipation efficiency is poor. Therefore, the width W ₄ of the support portion 22c is preferably in the range of 3 mm to 5 mm.

Optionally, please refer to FIG. 10 , the connection between the support part 22c and the second top wall 23a includes a third chamfered part 223. The provision of the third chamfered part 223 can reduce the distance between the support part 22c and the second top wall 23a. The degree of stress concentration at the connection between the support portion 22c and the second top wall 23a reduces the possibility of structural problems such as cracking, fracture or deformation at the connection between the support portion 22c and the second top wall 23a.

Optionally, please refer to FIG. 10 , the connection between the support part 22c and the second bottom wall 23b includes a fourth chamfered part 224. The provision of the fourth chamfered part 224 can lower the support part 22c and the second bottom wall 23b. The degree of stress concentration at the connection between the support portion 22c and the second bottom wall 23b reduces the possibility of structural problems such as cracking, fracture or deformation at the connection between the support portion 22c and the second bottom wall 23b.

Optionally, please refer to FIG. 10 . The third chamfer portion 223 has a chamfer circle structure, and the third chamfer portion 223 has a set radius R ₃ that satisfies 1 mm ≤ R ₃ ≤ 3 mm. The radius R ₃ can specifically be 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

Please refer to FIG. 10 . If the radius R ₃ is less than 1 mm, the radius R ₃ of the third chamfer portion 223 is smaller. On the one hand, the stress concentration at the connection between the support portion 22 c and the second top wall 23 a is relatively high. The connection between the support portion 22c and the second top wall 23a is prone to structural problems such as cracking, fracture or deformation; on the other hand, under the condition of ensuring dimensional accuracy, the production of the third chamfered portion 223 with a smaller radius _R3 The difficulty level is higher. If the radius R ₃ is greater than 3 mm, the radius R ₃ of the third chamfer portion 223 is larger, and the volume of the connection between the support portion 22 c and the second top wall 23 a is larger. Under the condition that the volume of the single bottom plate 2 remains unchanged, The volume of the fourth cavity 21a is relatively small, the amount of cooling liquid that the fourth cavity 21a can accommodate is relatively small, and the heat dissipation efficiency is poor. Therefore, the radius _R3 is preferably in the range of 1 mm to 3 mm.

In other embodiments (not shown in the figure), the third chamfer portion 223 has a right-angled structure.

Optionally, please refer to FIG. 10 . The fourth chamfered portion 224 has a chamfered circle structure, and the fourth chamfered portion 224 has a set radius R ₄ that satisfies 1 mm ≤ R ₄ ≤ 3 mm. The radius R ₄ can specifically be 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

Please refer to FIG. 10 . If the radius R ₄ is less than 1 mm, the radius R ₄ of the fourth chamfer portion 224 is smaller. On the one hand, the stress concentration at the connection between the support portion 22 c and the second bottom wall 23 b is relatively high. The connection between the support part 22c and the second bottom wall 23b is prone to structural problems such as cracking, fracture or deformation; on the other hand, under the condition of ensuring dimensional accuracy, the production of the fourth chamfered part 224 with a smaller radius _R4 is required. The difficulty level is higher. If the radius R ₄ is greater than 3 mm, the radius R ₄ of the fourth chamfered portion 224 is larger, and the volume of the connection between the support portion 22 c and the second bottom wall 23 b is larger. Under the condition that the volume of the single bottom plate 2 remains unchanged, The volume of the fourth cavity 21a is relatively small, the amount of cooling liquid that the fourth cavity 21a can accommodate is relatively small, and the heat dissipation efficiency is poor. Therefore, the radius R ₄ is preferably in the range of 1 mm to 3 mm.

In other embodiments (not shown in the figure), the fourth chamfer portion 224 has a right-angle structure.

Optionally, please refer to FIG. 11 , the support part 22 c is a plate-like structure, and the fourth cavity 21 a is separated by the support part 22 c to form at least two parallel and connected flow channels 211 . Under this arrangement, the flow channel 211 is used to guide the cooling liquid to flow in an orderly manner along the extension direction of the flow channel 211 (the direction parallel to the direction Y), so as to improve the circulation efficiency of the cooling liquid. Secondly, the flow channel 211 is also used to separate the cooling liquid to form at least two streams of fluids flowing separately. Each fluid is used to absorb the heat of the corresponding part of the base plate 2. The efficiency of each part of the base plate 2 to transfer heat to the cooling liquid is proportional to The degree of difference is small. Therefore, the arrangement of the flow channel 211 can improve the heat dissipation efficiency.

The greater the number of supporting portions 22c, the greater the number of flow channels 211 formed.

Optionally, the cross-sectional shape of the flow channel 211 is rectangular (as shown in FIG. 10 ), circular, semicircular, elliptical or hexagonal. The flow channel 211 with any of the above cross-sectional shapes can meet the requirements for circulating coolant.

Optionally, please refer to Figure 11, the bottom plate 2 also includes at least two partitions 22d located in the same flow channel 211. The partitions 22d are parallel to the plate-shaped support portion 22c, and are located in each of the same flow channel 211. The partition plates 22d are spaced apart along the flow guiding direction of the flow channel 211 (the direction parallel to the direction Y).

Please refer to FIG. 11 . When the cooling liquid flows in the flow channel 211 , it is easy to form multiple stratospheres that are stacked and arranged along the flow direction of the flow channel 211 . The stratosphere in the cooling liquid close to the support part 22 c is easy to absorb the support. The heat of portion 22c, or the stratosphere in the coolant close to the second top wall 23a can easily absorb the heat of the second top wall 23a, but the heat conduction efficiency between the stratospheres is poor, and the heat is difficult to transfer to the inner stratosphere in the coolant. , poor heat dissipation efficiency. However, the spaced arrangement of two adjacent partitions 22d can easily cause the coolant to form turbulent flow in the space between the two adjacent partitions 22d. The turbulent flow can break the stratosphere of the coolant to redistribute the heat in the coolant. , that is, the heat outside the coolant is more easily transferred to the inside of the coolant, thereby improving the heat dissipation efficiency.

Wherein, the height of the partition 22d may be less than the height _H2 of the fourth cavity 21a or the height _H3 of the support part 22c. The partition 22d may only be connected to the second top wall 23a or the partition 22d may only be connected to the second bottom wall. 23b connection. The height of the partition 22d may be equal to the height _H2 of the fourth cavity 21a or the height _H3 of the support part 22c. For example, the partition 22d is not only connected to the second top wall 23a, but the partition 22d is also connected to the second bottom wall 23b. . The width of the partition 22d (dimension along direction Z) is relatively smaller than the width of the flow channel 211 (dimension along direction Z). The ratio of the width of the partition 22d to the width of the flow channel 211 is between 1:10 and 2: Within 10 range. The length of the partition 22d (dimension along direction Y) is relatively smaller than the length of the support portion 22c (dimension along direction Y), and the ratio of the length of the partition 22d to the length of the support portion 22c is between 1:20 and 2: Within 20 range.

In addition, neither the position of the partition plate 22d in the direction Z nor the position of the partition plate 22d in the flow channel 211 is limited.

Optionally, as shown in FIG. 12 , each bottom plate 2 is distributed along the width direction of the battery box 10 (direction parallel to the direction Z). The fourth cavities 21 a of each bottom plate 2 are connected, and one of the outermost bottom plates is connected to the fourth cavity 21 a of the bottom plate 2 . 2 is provided with a liquid inlet 24a, and the other outermost bottom plate 2 is provided with a liquid outlet 24b. Under this setting, the cooling liquid outside the base plate 2 can flow into the fourth cavity 21a of the corresponding base plate 2 from the liquid inlet 24a of one of the outermost base plates 2. The fourth cavities 21a of each base plate 2 are connected in sequence to form a The cooling passage guides the one-way flow of coolant. The coolant can pass through each fourth cavity 21a one by one. The coolant can flow from the fourth cavity 21a of the other outermost bottom plate 2 to the bottom plate 2 through the corresponding liquid outlet 24b. external. The above arrangement allows the cooling liquid to flow in one direction from the liquid inlet 24a to the liquid outlet 24b, and the difficulty of controlling the flow of the cooling liquid is relatively low.

11 and 14, each base plate 2 is provided with a sixth opening 25b connected to the fourth cavity 21a, and the sixth openings 25b of every two adjacent and welded base plates 2 are connected. That is, the cooling liquid located in the fourth cavity 21a of one of the bottom plates 2 can flow to the fourth cavity 21a of the other bottom plate 2 through the sixth opening 25b. The second top wall 23a, the first side wall 22a and the second bottom wall 23b surround and form a sixth opening 25b.

In other embodiments (not shown in the figure), each bottom plate 2 may be distributed along the length direction of the battery box 10 (the direction parallel to the direction Y).

Optionally, please refer to Figure 2. The battery box 10 also includes a liquid inlet connection pipe 6. The liquid inlet connection pipe 6 is connected to the liquid inlet 24a as shown in Figure 12. The liquid inlet connection pipe 6 is used to communicate with the liquid inlet 24a. Corresponding external flow tubes (not shown in the figure) are connected. Under this arrangement, the cooling liquid can flow into the fourth cavity 21a of the base plate 2 from the external guide pipe through the liquid inlet connecting pipe 6 and the liquid inlet 24a. The liquid inlet connection pipe 6 is sealingly connected to the base plate 2 provided with the liquid inlet 24a (for example, welded or sealed with sealant) to reduce the possibility of coolant leakage between the liquid inlet connection pipe 6 and the base plate 2 .

Optionally, please refer to Figure 2. The battery box 10 also includes a liquid outlet connection pipe 7. The liquid outlet connection pipe 7 is connected to the liquid outlet 24b as shown in Figure 12. The liquid outlet connection pipe 7 is used to communicate with the liquid outlet 24b as shown in Figure 12. Corresponding external flow tubes (not shown in the figure) are connected. Under this arrangement, the cooling liquid can flow from the fourth cavity 21a of the base plate 2 through the liquid outlet 24b and the liquid outlet connecting pipe 7 into the corresponding external guide pipe. The liquid outlet connecting pipe 7 is sealingly connected to the base plate 2 provided with the liquid outlet 24b (for example, welded or sealed with sealant) to reduce the possibility of coolant leakage between the liquid outlet connecting pipe 7 and the base plate 2 .

Optionally, as shown in FIG. 14 , the bottom plate 2 is provided with a fifth opening 25 a that communicates with the fourth cavity 21 a. This arrangement facilitates the use of extrusion molding process to produce a plastic with the fifth opening 25 a and the fourth cavity 21 a. Base plate 2. Referring to FIGS. 15 and 16 , the battery box 10 may also include a first blocking member 8 . The first blocking member 8 is used to block the fifth opening 25a. The first blocking member 8 has a blocking effect on the coolant located in the fourth cavity 21a and reduces the leakage of the coolant to the base plate 2 through the fifth opening 25a. degree of external possibility.

Among them, the first blocking member 8 can be welded to the base plate 2 or bonded using sealant.

In addition, fifth openings 25a are provided at both opposite ends of the bottom plate 2 along the direction 25a.

Furthermore, please refer to FIGS. 15 and 16 . The first blocking member 8 includes at least two protruding portions 81 spaced apart along the direction Z. The protruding portions 81 penetrate and block the fifth opening 25 a. The height of the protruding portion 81 in the direction X is the same as the height H ₂ of the fourth cavity 21 a in the direction X.

Referring to FIGS. 15 and 16 , a separation space 82 is provided between every two protrusions 81 . The embodiment of the present application does not limit the number of protrusions 81 and spacing spaces 82 provided. Some of the separation spaces 82 are embedded in the support portion 22c, so that some of the support portions 22c and some of the protrusions 81 are connected. Some of the separation spaces 82 are embedded in the first side walls 22a, so that some of the first side walls 22a and some of the first side walls 22a are connected. There are raised portions 81 connected. The above arrangement further increases the reliability of the connection between the first blocking member 8 and the base plate 2 . Furthermore, each first blocking member 8 is connected to at least two bottom plates 2 to further improve the structural strength of the structural board composed of at least two bottom plates 2 .

Some fifth openings 25a and sixth openings 25b are connected. Correspondingly, some protrusions 81 also pass through the sixth openings 25b, but the sixth openings 25b are not blocked by the protrusions 81.

Optionally, please refer to FIG. 8 , the outermost bottom plate 2 may also include a third side wall 22e spaced apart from the second side wall 22b, that is, the second side wall 22b is located between the first side wall 22a and the third side. Between the walls 22e, the second top wall 23a is also connected to the second bottom wall 23b through the third side wall 22e. The second top wall 23a, the third side wall 22e, the second bottom wall 23b and the second side wall 22b enclose a fifth cavity 21b provided in the outermost bottom plate 2. Under this arrangement, the weight of the outermost bottom plate 2 is smaller, and accordingly, the weight of the battery box 10 is also smaller, and less energy is required to move the battery box 10 .

Among them, please refer to FIG. 11 , the fifth cavity 21b is provided along the direction Y.

Optionally, please refer to FIG. 17 , the outermost bottom plate 2 is also provided with a seventh opening 25c that communicates with the fifth cavity 21b. Referring to FIG. 18 , the battery box 10 may also include a second blocking member 9 . The second blocking member 9 blocks the seventh opening 25c. Correspondingly, at least part of the second blocking member 9 is located in the fifth cavity 21b. The outermost bottom plate 2 is also provided with a first through hole 26 that penetrates the second top wall 23a and the second bottom wall 23b. When the second blocking member 9 is not blocked in the seventh opening 25c, the first through hole 26 It can also be connected to the fifth all-time 21b. The second blocking member 9 is also provided with a second through hole 91. When the second blocking member 9 blocks the seventh opening 25c and at least part of the second blocking member 9 is located in the fifth cavity 21b, the second blocking member 9 is The through hole 91 is connected with the first through hole 26 to form a hole that can play a positioning or connecting role. The connection between the second blocking member 9 and the bottom plate 2 can enhance the location of the first through hole 26 in the bottom plate 2 The role of structural strength.

Optionally, as shown in Figure 4, the outermost bottom plate 2 and the side plate 1 are integrally connected or welded.

If the outermost bottom plate 2 and the side plate 1 are integrally formed and connected (for example, using a casting process, an extrusion molding process, or an injection molding process), it has the advantage of reducing the number of molds to be made, and also has the advantage of improving production efficiency, and also has the advantage of improving Advantages of structural strength and dimensional accuracy between the outermost base plate 2 and side plate 1.

Referring to FIG. 19 , a second aspect of the embodiment of the present application provides a method for manufacturing a battery box. Referring to Figure 2, the manufactured battery box 10 includes two side plates 1 and at least two bottom plates 2. Each bottom plate 2 is distributed along the width direction of the battery box 10 (parallel to the direction Z), and the outermost bottom plate 2 Connect to the corresponding side panel 1. The manufacturing method of the battery box provided by the embodiment of the present application includes:

Step S1: Use the one-piece molding process to make the side panels 1 and the bottom panel 2;

Step S2: Weld at least two bottom plates 2 using friction welding technology.

The one-piece molding process is used to produce the connected outermost base plate 2 and side plate 1 as shown in Figure 4. The one-piece molding process has the advantage of reducing the number of molds and improving production efficiency. It also has the advantage of improving the outermost base plate 2 and the side plate 1. Advantages of structural strength and dimensional accuracy between side panels 1. The one-piece molding process can be made by casting process, extrusion molding process or injection molding process.

The first side walls 22a of at least two base plates 2 as shown in Figure 10 are welded using a friction welding process. In detail, high-speed friction is used to increase the temperature of the first side wall 22a of the bottom plate 2 until at least part of the first side wall 22a is melted, and then the melted parts of the first side walls 22a of the two bottom plates 2 are fused. , after the first side walls 22a are cooled, a welded structure is formed between the first side walls 22a of the two bottom plates 2. Since no other material is needed to assist the welding during the welding process, the material of the welding structure between the first side walls 22a of the two bottom plates 2 is the same as the material of the bottom plate 2, that is, the welding between the first side walls 22a of the two bottom plates 2 The structural strength of the structure is the same as that of the base plate 2 , and the resulting structural plate located at the bottom of the battery box 10 has a high degree of operational reliability.

Among them, the first side walls 22a of the two bottom plates 2 can be rubbed against each other at high speed, or the curved side walls of the high-speed rotating cylinder can be used to rub the first side walls 22a of the two bottom plates 2 at the same time, until the two bottom plates 2 At least part of the first side walls 22a of the two bottom plates 2 is melted, and then the melted parts of the first side walls 22a of the two bottom plates 2 are fused.

Claims (17)

1. A battery box, characterized in that the battery box (10) comprises at least two welded bottom plates (2), each bottom plate (2) is provided with a fourth cavity (21 a), the fourth cavities (21 a) are used for circulating cooling liquid, each bottom plate (2) comprises a first side wall (22 a) welded with the adjacent bottom plate (2), and the first side wall (22 a) has a set width W ₂ The outermost bottom plate (2) includes a second side wall (22 b) spaced from the first side wall (22 a), the second side wall (22 b) having a set width W ₃ Satisfy 2W ₂ ≥W ₃ 。

2. The battery case according to claim 1, wherein 7mm +.w is satisfied ₂ Less than or equal to 10mm, or less than or equal to 3mm and less than or equal to W ₃ ≤8mm。

3. The battery box according to claim 1, wherein the bottom plate (2) further comprises a second top wall (23 a) and a second bottom wall (23 b), the second top wall (23 a) being connected to the second bottom wall (23 b) by the first side wall (22 a) and the second side wall (22 b), the second top wall (23 a), the first side wall (22 a) and the second bottom wall (23 b) being at least part of a structure for enclosing the fourth cavity (21 a), a junction of a side of any one of the first side walls (22 a) facing away from an adjacent first side wall (22 a) and the corresponding second top wall (23 a) comprising a first chamfer (221), and/or a junction of a side of any one of the first side walls (22 a) facing away from an adjacent first side wall (22 a) and the corresponding second bottom wall (23 b) comprising a second chamfer (222).

4. A battery case according to claim 3, wherein the first chamfer portion (221) has a chamfer circular structure, and the first chamfer portion (221) has a set radius R ₁ Satisfies R of 1mm or less ₁ Less than or equal to 3mm; and/or the second chamfer part (222) is in a chamfer round structure, and the second chamferThe portion (222) has a set radius R ₂ Satisfies R of 1mm or less ₂ ≤3mm。

5. A battery compartment according to claim 3, characterized in that the second top wall (23 a) and the second bottom wall (23 b) have a set height H therebetween ₂ Satisfies H of 5mm or less ₂ ≤8mm。

6. A battery compartment according to claim 3, wherein the base plate (2) further comprises a support portion (22 c) located in the fourth cavity (21 a), the second bottom wall (23 b) being connected to the second top wall (23 a) by the support portion (22 c).

7. The battery case according to claim 6, wherein the support portion (22 c) has a set height H ₃ Satisfies H of 5mm or less ₃ Less than or equal to 8mm, and/or the support part (22 c) has a set width W ₄ Meet the W of 3mm or less ₄ ≤5mm。

8. The battery box according to claim 6, characterized in that the connection of the support portion (22 c) with the second top wall (23 a) comprises a third chamfer portion (223) and/or the connection of the support portion (22 c) with the second bottom wall (23 b) comprises a fourth chamfer portion (224).

9. The battery case according to claim 8, wherein the third chamfer portion (223) has a chamfer round structure, and the third chamfer portion (223) has a set radius R ₃ Satisfies R of 1mm or less ₃ Less than or equal to 3mm; and/or the fourth chamfer part (224) is in a chamfer round structure, and the fourth chamfer part (224) has a set radius R ₄ Satisfies R of 1mm or less ₄ ≤3mm。

10. The battery box according to claim 6, wherein the support portion (22 c) has a plate-like structure, and the fourth cavity (21 a) is partitioned by the support portion (22 c) to form at least two parallel and communicating flow passages (211).

11. The battery case according to claim 10, wherein the cross-sectional shape of the flow channel (211) is rectangular, circular, semicircular, elliptical, or hexagonal.

12. The battery box according to claim 10, wherein the bottom plate (2) further includes at least two separators (22 d) located in the same flow channel (211), the separators (22 d) are parallel to the plate-like support portion (22 c), and the separators (22 d) located in the same flow channel (211) are arranged at intervals along the flow guiding direction of the flow channel (211).

13. The battery box according to any one of claims 1 to 12, wherein each bottom plate (2) is distributed along the width direction or the length direction of the battery box (10), and the fourth cavities (21 a) of each bottom plate (2) are communicated, wherein one outermost bottom plate (2) is provided with a liquid inlet (24 a), and the other outermost bottom plate (2) is provided with a liquid outlet (24 b).

14. The battery box according to claim 13, wherein the battery box (10) further comprises a liquid inlet connecting pipe (6) and a liquid outlet connecting pipe (7), the liquid inlet connecting pipe (6) is communicated with the liquid inlet (24 a), and the liquid inlet connecting pipe (6) is in sealing connection with the bottom plate (2) provided with the liquid inlet (24 a);

the liquid outlet connecting pipe (7) is internally communicated with the liquid outlet (24 b), and the liquid outlet connecting pipe (7) is in sealing connection with the bottom plate (2) provided with the liquid outlet (24 b);

the liquid inlet connecting pipe (6) and the liquid outlet connecting pipe (7) are used for being communicated with corresponding external flow guide pipes.

15. Battery compartment according to any of claims 1-12, characterized in that the bottom plate (2) is provided with a fifth opening (25 a) communicating with the fourth cavity (21 a), the battery compartment (10) further comprising a first closure member (8) closing off the fifth opening (25 a).

16. The battery box according to any one of claims 1 to 12, wherein the battery box (10) further comprises side plates (1), each of the bottom plates (2) is disposed in a distributed manner along a width direction or a length direction of the battery box (10), and an outermost bottom plate (2) and the side plates (1) are integrally formed or welded.

17. A method for manufacturing a battery box body, wherein the battery box body (10) comprises a side plate (1) and a bottom plate (2), and the method comprises the following steps:

manufacturing the connected side plate (1) and the bottom plate (2) by utilizing an integral molding process;

at least two of the bottom plates (2) are welded using a friction welding process.