Lower box body of battery pack, battery pack and vehicle

Abstract

According to the lower box body of the battery pack, the battery pack and the vehicle, on one hand, the box body of the lower box body is of an integrally-formed structure and is light and thin, and on the other hand, due to the fact that a runner plate assembling face is arranged on the bottom face of a bottom plate of the box body, when an upper runner plate is assembled on the runner plate assembling face, the runner plate can be assembled on the runner plate assembling face; according to the lower box body, a cooling medium channel is formed between the flow channel plate and the bottom surface of the bottom plate, so that a plate matched with the flow channel plate does not need to be additionally arranged, the weight of the plate matched with the flow channel plate is saved, the weight of the lower box body is light due to the two aspects, and the light weight requirement of some vehicle types on the lower box body can be met; and the production process is simpler and the airtight yield is higher. Besides, a protective structure and a runner plate can be flexibly assembled according to actual requirements on the basis of the lower box body, so that different requirements of different vehicle types on the strength, the weight and the heat dissipation of the lower box body can be flexibly met.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a lower housing of a battery pack, a battery pack, and a vehicle. Background Technology

[0002] A battery pack consists of the battery, a lower housing, and a top cover. The lower housing and top cover together form the space to house the battery. Currently, the lower housing of commonly available battery packs is constructed by welding a frame and a water-cooling plate. The frame forms the side walls of the lower housing, and the water-cooling plate forms the bottom wall. The frame is relatively thick and heavy, resulting in a high overall strength and weight for the lower housing. This cannot meet the lightweight requirements of some vehicle models, nor can it flexibly adapt to the different strength, weight, and heat dissipation requirements of various vehicle models.

[0003] Therefore, how to improve the adaptability of the lower casing of the battery pack to different vehicle models, so as to meet the lightweight requirements of some models, is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a lower housing of a battery pack. The lower housing includes a housing body, which is an integrally formed structure. The housing body includes a bottom plate and side plates. The side plates surround the bottom plate, and the side plates and the bottom plate together form a receiving compartment with an open top. A battery mounting surface is provided on the top surface of the bottom plate, and a flow channel plate mounting surface is provided on the bottom surface of the bottom plate. When the flow channel plate is mounted on the flow channel plate mounting surface, a cooling medium channel is formed between the flow channel plate and the bottom plate.

[0005] In one embodiment of the lower housing, the housing body includes a top flange surrounding the top edge of the side panel.

[0006] In one embodiment of the lower housing, the housing body includes a beam member disposed within the receiving compartment and connected between two opposing side walls of the receiving compartment.

[0007] In one embodiment of the lower housing, the lower housing includes a flow channel plate located at the bottom of the base plate, the flow channel plate being mounted on the flow channel plate mounting surface, and a cooling medium channel being formed between the flow channel plate and the base plate.

[0008] In one embodiment of the lower housing, the lower housing includes a side guard attached to the outside of the side panel.

[0009] In one embodiment of the lower housing, the side protective member is a frame structure fitted onto the outside of the side plate, including a frame body and a protruding rib. The protruding rib is disposed on the outside of the frame edge of the frame body, and the top surface of the protruding rib is lower than the top surface of the frame edge, thereby forming a stepped structure.

[0010] In one embodiment of the lower housing, the lower housing includes a bottom protective member connected to the bottom of the base plate, and the flow channel plate is located between the base plate and the bottom protective member.

[0011] This application also provides a battery pack, the battery pack including the lower housing described in any of the above claims.

[0012] In one embodiment of the battery pack, the battery pack further includes a top cover and a battery. The top cover is connected to the top of the housing body and seals the top opening of the housing body's receiving compartment. The top cover and the housing body enclose a battery receiving cavity, the receiving compartment being at least a part of the battery receiving cavity, and the battery being located within the battery receiving cavity.

[0013] This application also provides a vehicle that includes the battery pack described in any of the preceding claims.

[0014] The lower housing provided in this application is lightweight and thinner due to its one-piece molded structure and the influence of the processing technology. Furthermore, the bottom plate of the housing body has a flow channel plate mounting surface. When the flow channel plate is mounted on this surface, a cooling medium channel is formed between the flow channel plate and the bottom plate. Therefore, the bottom plate of the housing body not only contributes to the construction of the battery compartment but also to the construction of the cooling medium channel. This eliminates the need for additional plates that mate with the flow channel plate, thus saving weight. For these two reasons, the weight of the lower housing is lighter than that of lower housings constructed by welding a frame and a water-cooled plate in related technologies, thereby meeting the lightweight requirements of some vehicle models.

[0015] In addition, the one-piece molded box body has fewer airtightness testing steps compared to the lower box body which is welded together from a frame and a water-cooled plate in related technologies. Therefore, the production process is simpler and the airtightness yield is higher.

[0016] In addition, the lower housing can be flexibly expanded based on actual requirements. If the strength requirement is high but the weight reduction requirement is low, a protective structure can be further assembled on the basis of the lower housing. If the heat dissipation requirement is high, a flow channel plate can be further assembled on the basis of the lower housing. Therefore, the lower housing can flexibly adapt to the different requirements of different vehicle models for the strength, weight and heat dissipation of the lower housing.

[0017] The battery pack and vehicle provided in this application also have the aforementioned technical effects because they include the aforementioned lower housing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery pack provided in this application;

[0019] Figure 2 for Figure 1 Exploded view;

[0020] Figure 3 This is a schematic diagram of the structure of the first embodiment of the battery pack provided in this application;

[0021] Figure 4 for Figure 3 A partial cross-sectional view of the assembled box body, battery, and flow channel plate;

[0022] Figure 5 An exploded view of the second embodiment of the battery pack provided in this application;

[0023] Figure 6 for Figure 5 A partial cross-sectional view of the assembled box body, battery, and side protective components;

[0024] Figure 7 An exploded view of the third embodiment of the battery pack provided in this application;

[0025] Figure 8 for Figure 7 A partial sectional view of the assembled box body, battery, flow channel plate, side protection components, and bottom protection components.

[0026] The annotations in the attached figures are explained as follows:

[0027] 100. Container body, 101. Bottom plate, 102. Side plate, 103. Top flange, 104. Beam component, 105. Storage compartment;

[0028] 200 flow channel plate, 201 plate body, 202 convex part;

[0029] 300 cooling medium channel;

[0030] 400 Side guard, 401 Frame body, 402 Raised rib, 402a Mounting hole;

[0031] 500 Bottom protective component, 501 Bottom wall portion, 502 First side wall portion, 503 Top connecting flange;

[0032] 600 Top cover, 601 Top wall, 602 Second side wall, 603 Bottom connecting flange;

[0033] 700 battery. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 and Figure 2 As shown, the battery pack provided in this application includes a lower housing, and further includes an upper cover 600 and a battery 700.

[0036] The lower enclosure includes at least a enclosure body 100. The enclosure body 100 is a one-piece molded structure. Exemplarily, it can be a one-piece stamped structure or a one-piece molded structure. This application does not limit the material of the enclosure body 100, for example, it can be a metal material or a composite material. Exemplarily, the enclosure body 100 can be one-piece stamped from an aluminum plate, or one-piece stamped from a steel plate, or one-piece molded from a composite material.

[0037] The housing body 100 includes at least a bottom plate 101 and side plates 102. The side plates 102 surround the bottom plate 101, and their bottom ends are connected to the bottom plate 101. Together, the side plates 102 and the bottom plate 101 form a top-opening receiving compartment 105. A battery mounting surface is provided on the top surface of the bottom plate 101, onto which the battery 700 is mounted. A flow channel plate mounting surface is provided on the bottom surface of the bottom plate 101. When a flow channel plate 200 is mounted on the flow channel plate mounting surface, a cooling medium channel 300 is formed between the flow channel plate 200 and the bottom plate 101.

[0038] The top cover 600 is attached to the top of the casing body 100, sealing the top opening of the receiving compartment 105. The top cover 600 and the casing body 100 together form a battery receiving cavity, within which the battery 700 is located. The receiving compartment 105 is at least a part of the battery receiving cavity. The connection method between the top cover 600 and the casing body 100 is not limited; for example, it can be adhesive bonding, welding, or threaded fastener connection.

[0039] The aforementioned lower housing is relatively lightweight and thin due to the integrated molding structure of the housing body 100 and the influence of the processing technology. Furthermore, the bottom surface of the base plate 101 of the housing body 100 has a flow channel plate mounting surface. When the flow channel plate 200 is mounted on the flow channel plate mounting surface, a cooling medium channel 300 is formed between the flow channel plate 200 and the bottom surface of the base plate 101. Therefore, the base plate 101 of the housing body 100 not only participates in constructing the battery 700's housing 105 but also in constructing the cooling medium channel 300. This eliminates the need for additional plates that mate with the flow channel plate 200, thus saving weight. These two factors make the weight of the aforementioned lower housing lighter than that of lower housings constructed by welding a frame and a water-cooled plate in related technologies, thereby meeting the lightweight requirements of some vehicle models for lower housings.

[0040] In addition, the one-piece molded box body 100 has fewer airtightness testing steps compared to the lower box body which is welded together from a frame and a water-cooled plate in related technologies. Therefore, the production process is simpler and the airtightness yield is higher.

[0041] In addition, the lower housing can be flexibly expanded according to actual requirements. If the strength requirement is high but the weight requirement is low, a protective structure can be further assembled on the basis of the lower housing. If the heat dissipation requirement is high, a flow channel plate 200 can be further assembled on the basis of the lower housing. Therefore, the lower housing can flexibly adapt to the different requirements of different vehicle models for the strength, weight and heat dissipation of the lower housing.

[0042] Specifically, in the illustrated embodiments, such as Figure 1 and Figure 2 As shown, the base plate 101 is roughly rectangular, and the side plates 102 are disposed on the two long sides and two short sides of the base plate 101. The junctions between the side plates 102 on the long sides and the adjacent side plates 102 on the short sides have rounded corners, and the junctions between the side plates 102 and the base plate 101 also have rounded corners. The side plates 102 are roughly perpendicular to the base plate 101. Of course, in actual implementation, the shape of the base plate 101 can be flexibly adjusted as needed, and when the shape of the base plate 101 is adjusted, the shape of the side plates 102 must also be adjusted accordingly.

[0043] Specifically, in the illustrated embodiments, such as Figure 1 and Figure 2 As shown, the box body 100 also includes a top flange 103, which surrounds the top edge of the side panel 102. The top flange 103 is approximately perpendicular to the side panel 102. The top flange 103 can increase the support area of ​​the box body 100 on the top cover 600, which helps to reduce the deformation of the top cover 600 and helps to ensure the connection strength and sealing between the top cover 600 and the box body 100.

[0044] Specifically, in the illustrated embodiments, such as Figure 1 and Figure 2 As shown, the top cover 600 is a one-piece molded structure. The top cover 600 includes a top wall portion 601, a second side wall portion 602, and a bottom connecting flange 603. The second side wall portion 602 surrounds the top wall portion 601, with its top end connected to the top wall portion 601. The second side wall portion 602 is approximately perpendicular to the top wall portion 601. The bottom connecting flange 603 surrounds the bottom end of the second side wall portion 602, and is approximately perpendicular to the second side wall portion 602. The bottom connecting flange 603 of the top cover 600 is supported on the top flange 103 of the box body 100. This type of top cover 600 has high structural strength and is not easily deformed. Alternatively, the top cover 600 can also be a flat plate structure.

[0045] Specifically, in the illustrated embodiments, such as Figure 2 As shown, the box body 100 also includes a beam member 104, which is disposed within the receiving compartment 105 of the box body 100 and connected between two opposing side walls of the receiving compartment 105, serving a reinforcing function. Simultaneously, it can divide the receiving compartment 105 into several appropriately sized small compartments, each holding a battery module. For example, Figure 2 In the middle, the beam member 104 is connected between the side plates 102 on the two long sides of the two base plates 101, that is, between the two relatively long side walls of the storage compartment 105, that is, it divides the storage compartment 105 into two small compartments.

[0046] In some embodiments, such as Figure 3 and Figure 4 As shown, the lower housing also includes a flow channel plate 200, which is connected to the bottom of the base plate 101 of the housing body 100, forming a cooling medium channel 300 between the flow channel plate 200 and the base plate 101. This improves the heat dissipation capacity of the lower housing, enabling the battery pack to be used in vehicles with high heat dissipation requirements.

[0047] Specifically, this application does not limit the material of the flow channel plate 200; for example, it can be a metal plate or a non-metal plate. It also does not limit the connection method between the flow channel plate 200 and the base plate 101; for example, it can be bonded, welded, riveted, or connected by a snap-fit ​​joint.

[0048] Specifically, in the illustrated embodiments, such as Figure 4 As shown, the flow channel plate 200 has a plate body 201 and a protrusion 202. The protrusion 202 protrudes downward relative to the plate body 201 (that is, it protrudes away from the bottom plate 101 relative to the plate body 201). The plate body 201 is connected in parallel with the bottom surface of the bottom plate 101. The cooling medium channel 300 is formed between the protrusion 202 and the bottom surface of the bottom plate 101.

[0049] In some embodiments, such as Figure 5 and Figure 6 As shown, the lower housing also includes a side protection component 400, which is connected to the outside of the side panel 102 (i.e., the side of the side panel 102 away from the receiving compartment 105). This design can improve the side strength of the lower housing, enabling the battery pack to be used in vehicles with high requirements for frontal and side impact strength.

[0050] Specifically, this application does not limit the connection method between the side protection component 400 and the side plate 102, for example, it can be glued, welded, etc.

[0051] Specifically, in the illustrated embodiments, such as Figure 5 and Figure 6 As shown, the side protection component 400 is a frame structure fitted onto the outside of the side panel 102. This design can comprehensively improve the side strength of the lower housing. Alternatively, the side protection component 400 can also be a structure set locally on the side panel 102, for example, a strip structure set on the outside of the side panel 102 on the long side of the bottom plate 101.

[0052] Specifically, this application does not limit the material and forming method of the side protection component 400 of the frame structure. For example, it can be an aluminum profile welded frame, a roll-formed steel welded frame, an integral die-cast frame, etc.

[0053] Specifically, in the illustrated embodiments, such as Figure 5 and Figure 6 As shown, the side guard 400 of the frame structure includes a frame body 401 and protruding ribs 402 disposed on the outer side of the frame edge of the frame body 401. In the figure, a protruding rib 402 is provided on the outer side of each of the two relatively longer frame edges of the frame body 401. The protruding ribs 402 increase the local strength of the frame body 401. The protruding ribs 402 are provided with mounting holes 402a, through which they can be connected to the vehicle frame. The top surface of the protruding rib 402 is lower than the top surface of the frame edge of the frame body 401, thus forming a stepped structure. The head of the fastener passing through the mounting hole 402a can be accommodated within the height difference space between the top surface of the protruding rib 402 and the top surface of the frame edge.

[0054] In some embodiments, such as Figure 7 and Figure 8 As shown, the lower housing also includes a bottom protective component 500, which is connected to the bottom of the base plate 101. This design improves the bottom strength of the lower housing, allowing the battery pack to be used in vehicles with high requirements for the bottom strength of the lower housing.

[0055] Specifically, such as Figure 8As shown, when both the bottom protective component 500 and the flow channel plate 200 are provided, the flow channel plate 200 is located between the bottom protective component 500 and the bottom plate 101. The bottom protective component 500, the flow channel plate 200 and the side protective component 400 can be selected as one, any two of them can be selected, or all of them can be selected.

[0056] Specifically, such as Figure 8 As shown, when both bottom protective member 500 and side protective member 400 are provided, the bottom protective member 500 can be connected to the side protective member 400. Figure 8 In this design, the bottom protective component 500 is an integrally formed structure, including a bottom wall portion 501, a first side wall portion 502, and a top connecting flange 503. The first side wall portion 502 surrounds the bottom wall portion 501, and its bottom end is connected to the bottom wall portion 501. The first side wall portion 502 is approximately perpendicular to the bottom wall portion 501. The top connecting flange 503 surrounds the top end of the first side wall portion 502, and its top connecting flange 503 is approximately perpendicular to the first side wall portion 502. The top connecting flange 503 is connected parallel to the bottom surface of the frame body 401 of the side protective component 400 of the frame structure. This application does not limit the connection method between the bottom protective component 500 and the side protective component 400, such as bonding or welding.

[0057] The above embodiments can be freely combined without conflict.

[0058] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A lower casing for a battery pack, characterized in that, The lower housing includes a housing body (100), which is an integrally formed structure. The housing body (100) includes a bottom plate (101) and a side plate (102). The side plate (102) surrounds the bottom plate (101). The side plate (102) and the bottom plate (101) together form a top-opening receiving compartment (105). A battery mounting surface is provided on the top surface of the bottom plate (101), and a flow channel plate mounting surface is provided on the bottom surface of the bottom plate (101). When the flow channel plate (200) is mounted on the flow channel plate mounting surface, a cooling medium channel (300) is formed between the flow channel plate (200) and the bottom plate (101).

2. The lower casing of the battery pack according to claim 1, characterized in that, The box body (100) includes a top flange (103) which surrounds the top of the side panel (102).

3. The lower casing of the battery pack according to claim 1, characterized in that, The box body (100) includes a beam member (104) disposed within the receiving compartment (105) and connected between two opposing side walls of the receiving compartment (105).

4. The lower casing of the battery pack according to any one of claims 1-3, characterized in that, The lower housing includes a flow channel plate (200), which is located at the bottom of the base plate (101). The flow channel plate (200) is mounted on the flow channel plate mounting surface, and a cooling medium channel (300) is formed between the flow channel plate (200) and the base plate (101).

5. The lower casing of the battery pack according to any one of claims 1-3, characterized in that, The lower housing includes a side guard (400) which is connected to the outside of the side panel (102).

6. The lower casing of the battery pack according to claim 5, characterized in that, The side protection component (400) is a frame structure fitted on the outside of the side plate (102), including a frame body (401) and a protrusion (402). The protrusion (402) is located on the outside of the frame edge of the frame body (401), and the top surface of the protrusion (402) is lower than the top surface of the frame edge, thus forming a stepped structure.

7. The lower casing of the battery pack according to any one of claims 1-3, characterized in that, The lower housing includes a bottom protective component (500), which is connected to the bottom of the base plate (101), and the flow channel plate (200) is located between the base plate (101) and the bottom protective component (500).

8. A battery pack, characterized in that, The battery pack includes the lower housing as described in any one of claims 1-7.

9. The battery pack according to claim 8, characterized in that, The battery pack also includes a top cover (600) and a battery (700). The top cover (600) is connected to the top of the box body (100) and seals the top opening of the receiving compartment (105) of the box body (100). The top cover (600) and the box body (100) enclose a battery receiving cavity. The receiving compartment (105) is at least a part of the battery receiving cavity. The battery (700) is located inside the battery receiving cavity.

10. A vehicle, characterized in that, The vehicle includes the battery pack as described in any one of claims 8-9.

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