CN209804759U - Battery lower shell and battery pack - Google Patents

Abstract

The utility model discloses a battery lower casing, which comprises a bottom plate and a frame arranged on the bottom plate. The bottom plate and the frame are enclosed to form an accommodating cavity. Extruded profiles with cavities are adopted, and the cavities are simultaneously isolated from the accommodating cavity and the external space; a battery pack is also disclosed, including a battery upper case, a battery module and the aforementioned battery lower case, and the battery module is arranged in the accommodating cavity The battery upper case is covered on the battery lower case, and the frame is provided with a connector electrically connected to the battery module. The main structure of the bottom plate and the frame is made of extruded profiles, which can be lightweight under the premise of meeting the mechanical properties of the battery lower case. The number of extrusion dies is small and the cost is lower. It can meet the anti-corrosion requirements without electrophoresis process. It is beneficial to environmental protection, and also realizes double-layer sealing of the containing cavity, providing better protection for the battery.

Description

Battery lower case and battery pack

technical field

The utility model belongs to the field of automobiles, in particular to a battery lower casing and a battery pack.

Background technique

The on-board energy storage device of new energy vehicles is mainly based on batteries, and batteries are composed of several monomers connected in series and parallel to output high voltage and high current. As the main carrier of the new energy vehicle battery pack, the battery lower case plays an important role in the safety and protection of the battery and internal components. In order to enable the battery to safely output higher effective energy to maximize the power performance of the battery, major battery manufacturers are pursuing battery packs with high energy density, which requires the design of batteries that are lighter in weight and better in protection. case.

The existing battery lower case is formed by tailor-welding a plurality of stamped steel plates, and meets the anti-corrosion performance requirements through surface electrophoresis treatment, and provides effective support and protection for the electrical components inside the battery. However, the spliced stamped steel plates are not exactly the same, and the number of molds required is large, the cost is high, and the density of the steel plates is high, and the weight of the lower case of the battery is heavy. In order to meet the anti-corrosion requirements, surface electrophoresis is required, which is not conducive to environmental protection.

Utility model content

The technical problem to be solved by the utility model is: aiming at the problems of heavy weight and high cost of the existing solutions, a battery lower casing and a battery pack are provided.

In order to solve the above-mentioned technical problems, the embodiment of the utility model provides a battery lower case, which includes a bottom plate and a frame arranged on the bottom plate, the bottom plate and the frame are enclosed to form an accommodation cavity, and the frame includes A plurality of shrouds are sequentially sealed and connected along the circumference of the bottom plate. Both the shrouds and the bottom plate are extruded profiles with cavities, and the cavities are simultaneously isolated from the accommodating chamber and the external space.

Optionally, a support sleeve installed on the frame is also included, and the support sleeve provides a fixing point for the battery lower case to be connected to the vehicle body.

Optionally, a protective coating provided on the bottom of the battery lower case is further included, the protective coating covers the bottom surface of the bottom plate and the lower end of the outer periphery of the frame.

Optionally, the protective coating is a PVC coating sprayed on the assembled bottom plate and the frame, and the extension height of the PVC coating on the frame is 2-10 mm.

Optionally, the enclosure is divided into a front panel, a left panel, a rear panel and a right panel;

Both the left side panel and the right side panel include a first vertical panel, a first inner horizontal panel arranged inside the first vertical panel, and an outer horizontal panel arranged outside the first vertical panel, the The first inner transverse plate is connected to the bottom plate;

Both the front end plate and the rear end plate include a second vertical plate, a second inner horizontal plate arranged inside the second vertical plate, and the second inner horizontal plate is connected to the bottom plate;

The first vertical plate and the second vertical plate are sealed and connected along the circumference of the bottom plate, the first vertical plate, the second vertical plate, the first inner horizontal plate, the outer horizontal plate and The second inner horizontal plate is an extruded profile.

Optionally, the extruded profiles are aluminum profiles, magnesium profiles or magnesium-aluminum alloy profiles;

The supporting sleeve is an aluminum sleeve, a magnesium sleeve or a magnesium-aluminum alloy sleeve.

Optionally, the extruded profile is a harmonica profile.

Optionally, there are multiple support sleeves, a part of which is passed through the outer transverse plate of the left side plate, and another part is passed through the outer transverse plate of the right side plate;

One end of the support sleeve is provided with a flange surface, the outer horizontal plate is provided with a mounting hole, the support sleeve is installed in the mounting hole from top to bottom, and its flange surface is aligned with the corresponding the top surface of the outer transverse plating is in contact, or

The support sleeve is passed through the installation hole from bottom to top, and its flange surface is in contact with the bottom surface of the corresponding outer horizontal plate.

Optionally, the bottom plate includes a middle sub-board and two outer sub-boards, the cross-section of the middle sub-board is T-shaped, the cross-section of the outer sub-board is in-line, and the two upper parts of the middle sub-board are The end protrudes from both ends of the lower part;

One side of the two outer sub-boards is respectively connected to the left and right sides of the middle sub-board, and the other side of the two outer sub-boards is respectively connected to the right side of the first inner horizontal board of the left side board. side and the left side of the first inner transverse panel of the right side panel;

Both ends of the lower part of the middle sub-board are respectively connected to the rear side of the second inner transverse plate of the front end plate and the front side of the second inner transverse plate of the rear end plate, and the middle The two ends of the upper part of the sub-board are overlapped with the top surfaces of the two second inner horizontal plates; the front side of the second inner transverse panel of the rear end panel;

The front end plate, the left side plate, the rear end plate and the right side plate are welded, the middle sub-plate is welded to the outer sub-plate, and the frame is welded to the bottom plate.

The embodiment of the utility model also provides a battery pack, including a battery upper case, a battery module and the aforementioned battery lower case, the battery module is arranged in the accommodating cavity, and the battery upper case is closed On the lower casing of the battery, the frame is provided with a connector electrically connected to the battery module.

The battery lower casing and the battery pack provided by the embodiment of the utility model, the main structure of the bottom plate and the frame are combined by extruded profiles, avoiding the use of steel plate tailor welding, and making it light on the premise of satisfying the mechanical properties of the battery lower casing. Quantification, the number of extrusion dies is small, the cost is lower, and the anti-corrosion requirements can be met without electrophoresis technology, which is conducive to environmental protection; Realize the double-layer sealing of the containing cavity and provide better protection for the battery; the inner side of the lower battery case and the upper battery case can be used as internal electrical components of the battery, such as battery modules, high-voltage electrical boxes, battery management systems, Support and protect the main body of the cooling system, etc., and have a good electromagnetic shielding effect.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the lower case of the battery provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the structure before the bottom plate and frame are assembled in Fig. 1;

Fig. 3 is a top view of the lower casing of the battery shown in Fig. 1;

Fig. 4 is an A-A sectional view of the battery lower case shown in Fig. 3;

Fig. 5 is an enlarged view of an exploded state of the bottom plate in Fig. 4;

Fig. 6 is a B-B sectional view of the battery lower case shown in Fig. 3;

FIG. 7 is a schematic perspective view of the three-dimensional structure of the supporting sleeve in FIG. 6 .

The reference signs in the instructions are as follows:

1. Bottom plate; 11. Middle sub-board; 111. Upper part of middle sub-board; 112. Lower part of middle sub-board; 12. Outer sub-board;

2. Framework;

21. Left panel; 22. Right panel; S1, first vertical panel; S2, first inner horizontal panel; S3, outer horizontal panel;

23. Front end plate; 24. Rear end plate; E1, second vertical plate; E2, second inner horizontal plate;

V1, cavity; V2, support rib;

3. Accommodating cavity;

4. Support sleeve; 41. Flange surface;

5. Protective coating.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figures 1 to 4, the lower case of the battery provided by the embodiment of the present invention includes a bottom plate 1 and a frame 2 arranged on the bottom plate 1, the bottom plate 1 and the frame 2 are enclosed to form an accommodating cavity 3, and the frame 2 includes A plurality of shrouds are hermetically connected sequentially along the circumference of the bottom plate 1 , and both the shrouds and the bottom plate 1 are extruded profiles with a cavity V1 , and the cavity V1 is isolated from the accommodating chamber 3 and the external space at the same time.

The battery lower casing provided by the embodiment of the utility model, the main structure of the bottom plate 1 and the frame 2 are combined by extruded profiles, avoiding the use of steel plate tailor welding, and making it lightweight under the premise of satisfying the mechanical properties of the battery lower casing , the number of extrusion dies is small, the cost is lower, and the anti-corrosion requirements can be met without electrophoresis technology, which is conducive to environmental protection; Realize the double-layer sealing of the accommodating chamber 3 to provide better protection for the battery; the inner side of the lower battery case and the upper battery case can be used as internal electrical components of the battery, such as battery modules, high-voltage electrical boxes, and battery management systems , cooling system, etc. to support and protect the main body, and has a good electromagnetic shielding effect.

Specifically, the extruded profiles are aluminum profiles, magnesium profiles, or magnesium-aluminum profiles, which are light in weight, do not require electrophoresis, are suitable for extrusion processing, and are easy to process hollow structures with complex cross-sections (such as harmonica profiles) to improve mechanical properties , which is conducive to weight reduction and cost reduction.

In one embodiment, as shown in FIG. 6 and FIG. 7 , it further includes a support sleeve 4 installed on the frame 2 , and the support sleeve 4 is used to provide a fixing point for the lower case of the battery to be connected to the vehicle body. The support sleeve 4 plays a supporting role in the assembly of the entire battery pack and the vehicle body, avoiding torsion distortion or stress concentration caused by the hollow and unsupported extruded profile after fastening. Satisfy the mechanical performance and reduce the weight at the same time.

Specifically, the supporting sleeve 4 is an aluminum sleeve, a magnesium sleeve or a magnesium-aluminum alloy sleeve, which is light in weight and does not require electrophoresis, which is beneficial to weight reduction and cost reduction.

In one embodiment, as shown in Fig. 1 and Fig. 4, it also includes a protective coating 5 arranged at the bottom of the battery lower casing, the protective coating 5 covers the bottom surface of the bottom plate 1 and the lower end of the outer periphery of the frame 2, i.e. the protective coating Layer 5 covers the bottom of the battery lower casing and the lower ends of the sides. The protective coating 5 is located at the bottom of the battery pack, which can effectively protect the vehicle from gravel impacts and bottom bumps during driving.

Specifically, the protective coating 5 is a PVC coating sprayed on the assembled bottom plate 1 and frame 2, and the extension height of the PVC coating on the frame 2 is 2-10 mm. The PVC coating is easy to spray evenly, and can be stably attached to the extruded profile, and is not easy to be damaged when being impacted or knocked.

In one embodiment, the extruded profile is a harmonica profile, that is, the cavity V1 of the extruded profile has support ribs V2 (as shown in Figure 4), which has better mechanical properties and can be properly reduced in wall thickness. The case meets the mechanical performance, and it is more lightweight and cost-saving.

In one embodiment, as shown in Figures 1 to 4, the enclosure is divided into a front panel 23, a left panel 21, a rear panel 24 and a right panel 22, that is, the front panel 23, the left panel 21, the rear panel The plate 24 and the right side plate 22 are enclosure plates of different orientations of the battery lower case;

The left side plate 21 and the right side plate 22 both include a first vertical plate S1, a first inner horizontal plate S2 arranged inside the first vertical plate S1, and an outer horizontal plate S3 arranged outside the first vertical plate S1. The transverse plate S2 is connected to the bottom plate 1; that is, the cross-section of the left side plate 21 and the right side plate 22 is “Z-shaped”; the outer transverse plate S3 can be used to connect the vehicle body;

The front end plate 23 and the rear end plate 24 both include a second vertical plate E1, a second inner horizontal plate E2 located inside the second vertical plate E1, and the second inner horizontal plate E2 is connected to the bottom plate 1; that is, the front end plate 23 and the rear end plate The cross-section of the plate 24 is "L-shaped";

The first vertical plate S1 and the second vertical plate S2 are sealed and connected along the circumference of the bottom plate 1. Preferably, the first vertical plate S1, the second vertical plate S2, the first inner horizontal plate, the outer horizontal plate and the second inner horizontal plate are extruded profiles. The structure is simple, and it is convenient for the installation of the frame 2 and the bottom plate 1 as well as the installation of the battery pack and the vehicle body.

Preferably, as shown in FIG. 4 , the first vertical board S1 , the first inner horizontal board S2 , the outer horizontal board S3 , the first vertical board S1 and the first inner horizontal board S2 are all harmonica-shaped profiles.

Preferably, as shown in FIG. 4, the first vertical board S1, the first inner horizontal board S2 and the outer horizontal board S3 of the left side board 21 are integrally structured, and the first vertical board S1, the first inner horizontal board of the right side board 22 The plate S2 and the outer transverse plate S3 are integrally structured, the second vertical plate E1 of the front end plate 23 and the second inner transverse plate E2 are integrally structured, and the second vertical plate E1 and the second inner transverse plate E2 of the rear end plate 24 are integrated structure.

Specifically, when the supporting sleeve 4 is provided, multiple supporting sleeves 4 are provided, and a part of the supporting sleeve 4 passes through the left side plate 21 , and another part passes through the right side plate 22 .

In one embodiment, one end of the support sleeve 4 is provided with a flange surface 41 (as shown in FIG. 7 ), and the left side plate 21 and the right side plate 22 are provided with mounting holes;

The support sleeve 4 is passed through the installation hole from top to bottom and its flange surface 41 is in contact with the top surface of the corresponding left side plate 21 or right side plate 22, or

The supporting sleeve 4 passes through the installation hole (as shown in FIG. 6 ) from bottom to top, and its flange surface 41 is in contact with the bottom surface of the corresponding left side plate 21 or right side plate 22 . The support sleeve 4 is installed from top to bottom or from bottom to top, both of which can optimize the stress concentration of the battery pack subjected to vibration and impact during operation, and realize light weight while satisfying the mechanical performance.

In one embodiment, as shown in Figures 1 to 5, the bottom plate 1 includes a middle sub-board 11 and two outer sub-boards 12; one side of the two outer sub-boards 12 is respectively connected to the left and right sides of the middle sub-board 11, two The other side of the outer sub-board 12 is respectively connected to the first inner horizontal board S2 of the left side board 21 and the first inner horizontal board S2 of the right side board 22; Two inner transverse plates E2 and the second inner transverse plate E2 of the rear end plate 24, the two ends of the outer sub-plate 12 are respectively connected to the second inner transverse plate E2 of the front end plate 23 and the second inner transverse plate E2 of the rear end plate 24 . The bottom plate 1 is simple in structure, easy to process and assemble, and the bottom plate 1 is easy to assemble with the frame 2 .

Preferably, as shown in Figures 1 to 5, the cross-section of the middle sub-board 11 is T-shaped (that is, the upper part 111 of the middle sub-board is perpendicular to the lower part 112 of the middle sub-board), and the cross-section of the outer sub-board 12 is in-line , the two ends of the upper part 111 of the middle sub-board protrude from the two ends of the lower part;

One side of the two outer sub-boards 12 is respectively connected to the left and right sides of the middle sub-board 11, and the other side of the two outer sub-boards 12 is respectively connected to the right side and the right side board of the first inner horizontal board S2 of the left side board 21. 22 on the left side of the first inner horizontal board S2;

The two ends of the lower part 112 of the middle sub-board are respectively connected to the rear side of the second inner horizontal board E2 of the front end plate 23 and the front side of the second inner horizontal board E2 of the rear end board 24, and the two ends of the upper part 111 of the middle sub-board The ends are overlapped on the top surfaces of the two second inner transverse plates E2; the two ends of the outer sub-plate 12 are respectively connected to the rear side of the second inner transverse plate E2 of the front end plate 23 and the second inner transverse plate E2 of the rear end plate 24 the front side.

The structure is simple, easy to process and assemble, more convenient to assemble the bottom plate 1 and the frame 2, and also convenient to set the protective coating 5, and can make the bottom of the bottom plate 1 and the frame 2 flush through reasonable design, which is convenient for the installation of the battery pack and increases the battery life. The stress-bearing area of the large battery pack and the body is conducive to dispersing the force.

Preferably, as shown in FIG. 5 , both the middle sub-panel 11 and the outer sub-panel 12 are harmonica-shaped profiles.

Specifically, each front end plate 23, left side plate 21, rear end plate 24, and right side plate 22 are welded (preferably MIG welding), which is easy to realize the sealed assembly of the frame 2, and the connection is stable, reliable, and durable;

The middle sub-board 11 and the outer sub-board 12 are welded (preferably FSW welding), which is easy to realize the sealed assembly of the bottom plate 1, and the connection is stable, reliable and durable;

The frame 2 is welded to the bottom plate 1 (preferably FSW welding), which is easy to realize the sealed assembly of the bottom plate 1, and the connection is stable, reliable and durable;

The support sleeve 4 is welded to the frame 2 (MIG welding is preferred), which is easy to realize the sealing assembly of the support sleeve 4 and the frame 2, and the connection is stable, reliable and durable.

In order to simplify assembly, it is preferable to weld the front end plate 23, the left side plate 21, the rear end plate 24 and the right side plate 22 to form the frame 2, and after the middle sub-plate 11 and the outer sub-plate 12 are welded to form the bottom plate 1, then the frame 2 and the The bottom plate 1 is welded into the main part of the entire lower case of the battery, and then the support sleeve 4 is assembled in the mounting hole of the frame 2 and the flange surface 41 in contact with the top surface or bottom surface of the frame 2 is welded to the frame 2, and then under the battery The bottom of the shell is sprayed with PVC coating.

The embodiment of the utility model also provides a battery pack, including a battery upper case, a battery module, and the battery lower case mentioned in any one of the foregoing embodiments, the battery module is arranged in the accommodation chamber 3, and the battery upper case The cover is closed on the lower case of the battery, and the frame 2 is provided with a connector electrically connected to the battery module, through which the external electrical equipment is connected. The battery case composed of the battery upper case and the battery lower case can provide support and protection for the battery module set in the accommodating cavity 3, and has good sealing effect and electromagnetic shielding effect. The weight reduction and cost reduction of the casing is conducive to the weight reduction and cost reduction of the battery pack as a whole.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model should be included in the utility model. within the scope of protection.

Claims (10)

1. A battery lower case, comprising a bottom plate and a frame arranged on the bottom plate, the bottom plate and the frame are enclosed to form an accommodating chamber, characterized in that the frame includes a plurality of To the coaming plates that are sequentially sealed and connected, both the coaming plate and the bottom plate are extruded profiles with cavities, and the cavities are isolated from the accommodating cavity and the external space at the same time. 2. The battery lower case according to claim 1, further comprising a support sleeve mounted on the frame, the support sleeve provides a fixed point for the battery lower case to be connected to the vehicle body . 3. The battery lower case according to claim 1, further comprising a protective coating provided on the bottom of the battery lower case, the protective coating covering the bottom surface of the bottom plate and the bottom of the frame. the lower end of the periphery. 4. The battery lower case according to claim 3, wherein the protective coating is a PVC coating sprayed on the assembled bottom plate and the frame, and the PVC coating is on the The extension height on the frame is 2-10mm. 5. The lower case of the battery according to any one of claims 1-4, wherein the enclosure is divided into a front panel, a left panel, a rear panel and a right panel; Both the left side panel and the right side panel include a first vertical panel, a first inner horizontal panel arranged inside the first vertical panel, and an outer horizontal panel arranged outside the first vertical panel, the The first inner transverse plate is connected to the bottom plate; Both the front end plate and the rear end plate include a second vertical plate, a second inner horizontal plate arranged inside the second vertical plate, and the second inner horizontal plate is connected to the bottom plate; The first vertical plate and the second vertical plate are sealed and connected along the circumference of the bottom plate, the first vertical plate, the second vertical plate, the first inner horizontal plate, the outer horizontal plate and The second inner horizontal plate is an extruded profile. 6. The battery lower case according to claim 2, wherein the extruded profile is an aluminum profile, a magnesium profile or a magnesium-aluminum alloy profile; The supporting sleeve is an aluminum sleeve, a magnesium sleeve or a magnesium-aluminum alloy sleeve. 7. The battery lower case according to claim 6, wherein the extruded profile is a harmonica-shaped profile. 8. The lower case of the battery according to claim 2, wherein the enclosure is divided into a front panel, a left panel, a rear panel and a right panel; Both the left side panel and the right side panel include a first vertical panel, a first inner horizontal panel arranged inside the first vertical panel, and an outer horizontal panel arranged outside the first vertical panel, the The first inner transverse plate is connected to the bottom plate; Both the front end plate and the rear end plate include a second vertical plate, a second inner horizontal plate arranged inside the second vertical plate, and the second inner horizontal plate is connected to the bottom plate; The first vertical plate and the second vertical plate are sealed and connected along the circumference of the bottom plate, the first vertical plate, the second vertical plate, the first inner horizontal plate, the outer horizontal plate and The second inner horizontal plate is an extruded profile; There are multiple supporting sleeves, one part of which is passed through the outer horizontal plate of the left side plate, and the other part is passed through the outer horizontal plate of the right side plate; One end of the supporting sleeve is provided with a flange surface, and the outer horizontal plate is provided with a mounting hole, and the supporting sleeve is installed in the mounting hole from top to bottom, and its flange surface is aligned with the corresponding the top surface of the outer transverse plating is in contact, or The support sleeve is passed through the installation hole from bottom to top, and its flange surface is in contact with the bottom surface of the corresponding outer horizontal plate. 9. The battery lower case according to claim 5, wherein the bottom plate comprises a middle sub-plate and two outer sub-plates, the cross-section of the middle sub-plate is T-shaped, and the cross-section of the outer sub-plate is T-shaped. In a straight line, the two ends of the upper part of the middle sub-board protrude from the two ends of the lower part; One side of the two outer sub-boards is respectively connected to the left and right sides of the middle sub-board, and the other side of the two outer sub-boards is respectively connected to the right side of the first inner horizontal board of the left side board. side and the left side of the first inner transverse panel of the right side panel; Both ends of the lower part of the middle sub-board are respectively connected to the rear side of the second inner horizontal board of the front end board and the front side of the second inner horizontal board of the rear end board, and the middle The two ends of the upper part of the sub-board are overlapped with the top surfaces of the two second inner horizontal plates; the front side of the second inner transverse panel of the rear end panel; The front end plate, the left side plate, the rear end plate and the right side plate are welded, the middle sub-plate is welded to the outer sub-plate, and the frame is welded to the bottom plate. 10. A battery pack, comprising a battery upper case and a battery module, further comprising a battery lower case according to any one of claims 1-9, the battery module being arranged in the accommodating cavity, The upper case of the battery is covered on the lower case of the battery, and the frame is provided with a connector electrically connected to the battery module.