Battery box body, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery box body, a battery pack and electric equipment, the battery box body comprises a bottom welding sub-part and two lateral welding sub-parts, and the two lateral welding sub-parts are respectively connected to two sides of the bottom welding sub-part to form an accommodating area for accommodating a battery cell; according to the utility model, by reducing the number of aluminum profiles and welding procedures of the battery box body, only the three welding sub-components are mutually welded and connected, so that the situation that the flatness of the battery box body is difficult to guarantee due to excessive use of plates is avoided, the battery box body has good process stability and higher structural strength, and the requirements of extrusion resistance and shock resistance of the battery box body are met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery box body, a battery pack and an electrical equipment. Background Art

[0002] With the rapid expansion of the electric commercial vehicle field, for different types of vehicles, especially heavy trucks with high endurance, the mode of endurance replacement and power supply is becoming more and more popular. In order to ensure the effectiveness and efficiency of this mode, the design of the battery box body not only needs to carry a high amount of electricity, but also must follow certain size standards to achieve seamless adaptation between different vehicle types.

[0003] Currently, the standard battery box body is as Figure 1 shown, which is a structure formed by welding 5 aluminum profiles. Although this design is widely used in the market, the number of molds, tooling fixtures and welding processes required are relatively complex. Due to the large number of welding processes, the battery box body is extremely likely to deform during the welding process, and it is difficult to ensure the flatness of the bottom surface. Seriously, it will lead to the failure of the sealing performance. Moreover, during the extrusion and vibration test processes, the welded joints of the battery box body formed by welding multiple aluminum profiles are prone to failure, affecting the stability of the overall structure. Content of the Utility Model

[0004] To solve the problems existing in the prior art, the first object of the utility model is to provide a battery box body, which improves the structural strength of the battery box body through a suitable welding design, has stronger reliability in the welding process, and ensures the sealing performance and anti-deformation ability of the battery box body.

[0005] The second object of the utility model is to provide a battery pack.

[0006] The third object of the utility model is to provide an electrical equipment.

[0007] According to the first object of the utility model, a battery box body is provided, which includes a bottom welding sub-component and a lateral welding sub-component. The two lateral welding sub-components are respectively connected to both sides of the bottom welding sub-component to form a receiving area for accommodating battery cells.

[0008] Further, the battery box body provided by the utility model may also have the following feature: both the lateral welding sub-component and the bottom welding sub-component are integral structures.

[0009] Further, the battery box body provided by the utility model may also have the following feature: the lateral welding sub-component includes a first branch and a second branch that are perpendicular to each other; the two second branches are respectively connected to both sides of the bottom welding sub-component to form the bottom of the receiving area.

[0010] Further, the battery box body provided by the present utility model may further have the following feature: the area ratio of the second part to the area of the bottom of the accommodating area is not greater than 1 / 10.

[0011] Further, the battery box body provided by the present utility model may further have the following feature: a plurality of flow channels for the coolant to flow through are provided on the bottom welding sub-component.

[0012] Further, the battery box body provided by the present utility model may further have the following feature: a liquid inlet and a liquid outlet are further provided on the bottom welding sub-component, the flow channels include an inlet flow channel communicated with the liquid inlet and an outlet flow channel communicated with the liquid outlet; the inlet flow channel is communicated with the outlet flow channel to form a cooling circuit for cooling the battery cells; the liquid inlet and the liquid outlet are communicated through a plurality of parallel cooling circuits.

[0013] Further, the battery box body provided by the present utility model may further have the following feature: the length direction of the flow channel extends along the length direction of the bottom welding sub-component, and the lengths of the plurality of flow channels are different.

[0014] Further, the battery box body provided by the present utility model may further have the following feature: a cross beam for strengthening the frame strength is provided in the middle of the bottom welding sub-component, and both ends of the cross beam are respectively connected to the two side welding sub-components.

[0015] According to the second aspect of the present utility model, there is provided a battery pack, including the battery box body as described above.

[0016] According to the third aspect of the present utility model, there is provided an electrical equipment, including the battery pack as described above.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. In the present application, by reducing the number of aluminum profiles and welding processes of the battery box body and only using the mutual welding connection of three welding sub-components, it is ensured that the flatness of the battery box body is not difficult to guarantee due to excessive use of plates, and it has good process stability and high structural strength, meeting the anti-extrusion and anti-seismic requirements of the battery box body.

[0019] 2. In the present application, by setting the side welding sub-component to be composed of a first part and a second part that are perpendicular to each other, the sealing performance and structural strength of the battery box body are ensured, and better positioning can be provided during assembly, reducing assembly errors. Moreover, by further restricting the ratio of the second part, the bottom welding sub-component becomes a relatively large continuous weld-free area, which is beneficial to enhancing the overall rigidity of the bottom of the accommodating area and ensuring the flatness of the bottom.

[0020] 3. In this application, the bottom welding sub-component is used to form a liquid cooling structure for cooling the battery cells, and is provided with a plurality of flow channels for the coolant to flow through, so as to cool the bottom of the battery cells and meet the temperature difference requirements under different working conditions. Description of the Drawings

[0021] The drawings incorporated herein and constituting a part of this specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. In these drawings, like reference numerals are used to represent like elements. The drawings in the following description are some embodiments of the present utility model, but not all embodiments. Those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural view of a standard battery box;

[0023] Figure 2 is a schematic structural view of the present utility model;

[0024] Figure 3 is a front view of the present utility model;

[0025] Figure 4 is a bottom view of the present utility model.

[0026] In the figure:

[0027] 1. Aluminum profile welding part; 2. Welding point; 3. Bottom welding sub-component; 4. Lateral welding sub-component; 41. First branch; 42. Second branch; 5. Accommodation area; 61. Inlet flow channel; 62. Outlet flow channel; 71. Inlet; 72. Outlet; 8. Cross beam. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0029] The standard battery box structure is as Figure 1As shown in the figure, it includes five welded aluminum profile welding parts 1. Although this design is widely used in the market, due to the increase in the welding process, it will cause deformation of the battery box during the welding process, which will make it difficult to ensure the flatness of the bottom of the box, thus affecting the sealing performance of the box. Moreover, the use of too many aluminum profile welding parts 1 and the formation of too many welding points 2 will also affect the structural strength of the box. During the extrusion and vibration test process, the welding joints often fail.

[0030] To solve the above problems, the present utility model provides a battery box, and the specific structure is as follows:

[0031] As Figures 2 to 4 shown, the battery box includes a bottom welding sub-part 3 and a side welding sub-part 4. The two side welding sub-parts 4 are respectively connected to both sides of the bottom welding sub-part 3 to form a receiving area 5 for accommodating the battery cells. Compared with the design of welding five aluminum profile welding parts 1 to each other, this application only uses three welding sub-parts, ensuring the flatness of the battery box during processing. Moreover, fewer welding points 2 make the battery box have good process stability and high structural strength, and can meet the anti-extrusion and anti-seismic requirements of the battery box. Preferably, the side welding sub-part 4 and the bottom welding sub-part 3 are welded by friction stir welding to form a high-strength welding joint, making the overall mechanical properties of the battery box further superior to the base material.

[0032] To further ensure the structural strength, both the side welding sub-part 4 and the bottom welding sub-part 3 are integrally formed by extruding aluminum profiles. The integral structure not only avoids forming too many welding points 2 and ensures the structural strength of the box, but also allows the battery box to customize the required cross-sectional profile according to specific heat dissipation requirements and structural strength requirements, so as to achieve the purpose of optimizing the design of the battery box.

[0033] In some embodiments, as Figure 3 shown, the side welding sub-part 4 includes a first part 41 and a second part 42 that are perpendicular to each other; the two second parts 42 are respectively connected to both sides of the bottom welding sub-part 3 to form the bottom of the receiving area 5. By designing the side welding sub-part 4 as the first part 41 and the second part 42 that are perpendicular to each other, this L-shaped design not only has higher sealing performance and structural strength compared with the upright design, but also can provide better positioning during assembly and reduce assembly errors. As a further improvement of this embodiment, the area ratio of the second part 42 to the area of the bottom of the receiving area 5 is not greater than 1 / 10, and preferably the ratio is 1 / 12. By restricting the ratio of the second part 42 to the bottom, the bottom welding sub-part 3 becomes a relatively large continuous weld-free area, which is beneficial to enhancing the overall rigidity of the bottom of the receiving area 5 and ensuring the bottom flatness.

[0034] To cooperate with the common design of opening the bottom of the battery cell in the industry for liquid cooling (the outside of the battery cell is wrapped by a blue film, and the opening means that some areas are not wrapped by the blue film), as Figure 4 shown, several flow channels for the coolant to flow through are provided on the bottom welding sub-component 3 to cool the bottom of the battery cell. In a specific embodiment, in order to form a complete liquid cooling loop on the bottom welding sub-component 3, an inlet 71 and an outlet 72 are also provided on the bottom welding sub-component 3. The flow channels include an inlet flow channel 61 communicated with the inlet 71 and an outlet flow channel 62 communicated with the outlet 72; the inlet flow channel 61 is communicated with the outlet flow channel 62 to form a cooling loop for cooling the battery cell, and the inlet 71 and the outlet 72 are communicated through several parallel cooling loops. The inlet 71 and the outlet 72 are preferably arranged on both sides of the same end face of the bottom welding sub-component 3 to ensure that a U-shaped loop that meets the cooling requirements of the battery cell is formed during liquid cooling. The above flow channel setting method has passed thermal simulation and can meet the requirements that the maximum temperature of the battery cell does not exceed 55°C and the temperature difference does not exceed 5°C.

[0035] As a further improvement of the above embodiment, it is preferred that the length direction of the flow channel extends along the length direction of the bottom welding sub-component 3, and the lengths of several flow channels are different to improve the flow rate of the coolant and meet the requirements of battery cell cooling.

[0036] In some embodiments, as Figure 2 shown, a cross beam 8 for strengthening the structural strength is provided in the middle of the bottom welding sub-component 3. The two ends of the cross beam 8 are respectively connected to two side welding sub-components 4 to form a more stable frame structure, enhance the stiffness of the whole system, and the cross beam 8 can form an installation part for installing other structures of the battery pack such as the BMS master-slave board (not shown in the figure).

[0037] The present utility model also provides a battery pack, including the battery box as described above.

[0038] The present utility model also provides an electrical equipment, including the battery pack as described above.

[0039] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0040] In the description of the present invention, it should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0041] In the description of the present invention, it should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a number of" is two or more.

[0042] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present utility model are only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A battery box body, characterized in that, It includes a bottom welding sub-component (3) and side welding sub-components (4). The two side welding sub-components (4) are respectively connected to both sides of the bottom welding sub-component (3) to form a receiving area (5) for accommodating the battery cells.

2. The battery box according to claim 1, characterized in that, Both the side welding sub-component (4) and the bottom welding sub-component (3) are of integral structure.

3. The battery box according to claim 1, characterized in that, The side welding sub-component (4) includes a first branch (41) and a second branch (42) that are perpendicular to each other; the two second branches (42) are respectively connected to both sides of the bottom welding sub-component (3) to form the bottom of the receiving area (5).

4. The battery box according to claim 3, characterized in that, The area ratio of the second branch (42) to the area of the bottom of the receiving area (5) is not greater than 1 / 10.

5. The battery box according to claim 1, wherein, A number of flow channels for the coolant to flow through are provided on the bottom welding sub-component (3).

6. The battery box according to claim 5, characterized in that, An inlet (71) and an outlet (72) are further provided on the bottom welding sub-component (3). The flow channels include an inlet flow channel (61) communicating with the inlet (71) and an outlet flow channel (62) communicating with the outlet (72); the inlet flow channel (61) communicates with the outlet flow channel (62) to form a cooling circuit for cooling the battery cells; the inlet (71) and the outlet (72) are connected through a number of parallel cooling circuits.

7. The battery box according to claim 5, wherein The length direction of the flow channels extends along the length direction of the bottom welding sub-component (3), and the lengths of the number of flow channels are different.

8. The battery box according to claim 1, wherein A cross beam (8) for strengthening the structural strength is provided in the middle of the bottom welding sub-component (3), and both ends of the cross beam (8) are respectively connected to the two side welding sub-components (4).

9. A battery pack, characterized in that, It includes the battery box as described in any one of claims 1-8.

10. An electrical device, characterized in that, It includes the battery pack as described in claim 9.

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