CN211743225U

CN211743225U - Shell of battery module

Info

Publication number: CN211743225U
Application number: CN202020389129.7U
Authority: CN
Inventors: 黄森; 黎文; 黎远进; 陈能合; 郭军; 丁永华
Original assignee: Zhuhai Penghui Energy Co ltd
Current assignee: Zhuhai Penghui Energy Co ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-10-23
Anticipated expiration: 2030-03-24

Abstract

The utility model discloses a shell of battery module, including curb plate and end plate, the end plate is equipped with two, the curb plate is equipped with two, two curb plate and two the end plate is around establishing into upside open-ended installation cavity down, the curb plate both ends are equipped with the tip hem portion of buckling towards end plate one side, tip hem portion overlap joint in the end plate outside, tip hem portion with welded connection between the end plate. The utility model discloses an improve the connected mode of shell upper side board, the pulling force that the welding department received on the curb plate when electric core inflation reduces for the solder joint keeps firmly being difficult to drop lastingly, has prolonged the life-span of battery module normal use.

Description

Shell of battery module

Technical Field

The utility model discloses a shell of battery module belongs to the power battery field.

Background

With the gradual maturity of the power battery manufacturing technology, the electric automobile has the competitive strength with the traditional fuel automobile. Electric passenger cars, electric logistics vehicles, electric bus vehicles and electric low-speed vehicles are increasingly present in cities, rural areas and daily lives of everyone. The technical direction and the energy density of the power battery system need to be improved, and the problem needs to be solved from two aspects; one is from the aspect of cell design, and the other is from the aspect of battery PACK (battery PACK) design.

The Battery PACK System is formed by connecting a plurality of single Battery cells in series and parallel by using a mechanical structure, and considering the problems of mechanical strength, thermal Management, BMS (Battery Management System) matching and the like of the System. Because battery PACK system volume restriction, require small to the size of battery and battery module, compact structure to work under the adaptation long-term vibration condition and use. Because the lithium cell characteristic, current battery module long-term work back electricity core can 7% thickness inflation, the shell that leads to battery module receives the extrusion force increase in electricity core inflation direction, but its shell of battery module on the existing market adopts side welded mode to connect at the curb plate of electricity core inflation direction, this kind of connected mode's curb plate is great in solder joint department atress, long-term use probably appears the solder joint and drops, leads to the curb plate not hard up to drop even, influences normal use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shell of battery module, through the connected mode who improves shell upper side plate, the pulling force that the welding department received on the curb plate when electric core inflation reduces for the solder joint keeps firmly being difficult to drop lastingly, has prolonged the life-span of battery module normal use.

The utility model relates to a shell of battery module, including curb plate and end plate, the end plate is equipped with two, the curb plate is equipped with two, two curb plate and two the end plate is around establishing into down upside open-ended installation cavity, the curb plate both ends are equipped with the tip hem portion of buckling towards end plate one side, tip hem portion overlap joint in the end plate outside, tip hem portion with welded connection between the end plate.

Further, the end hem portion is formed by bending the end portion of the side plate by not less than 90 degrees.

Further, the side plate is made of an aluminum plate, and a side insulating plate is arranged on the inner side of the side plate.

Further, the end plate is an aluminum plate, and an end insulating plate is arranged on the inner side of the end plate.

Further, the side insulating plates and the end insulating plates are both PC boards.

Furthermore, the shell is provided with a cushioning rubber pad or a heating sheet at an opening at the lower side of the installation cavity.

Furthermore, a plurality of heat dissipation holes are formed in the side plate.

Furthermore, an upper side edge folding part and a lower side edge folding part which are bent towards one side of the installation cavity are respectively arranged on the upper side and the lower side of the side plate, the lower side edge folding part is used for being connected with the cushioning rubber pad or the heating sheet, and the upper side edge folding part is flush with the upper end of the end insulating plate.

Furthermore, the end plate is provided with a connecting structure for fixing the shell, and the connecting structure comprises a connecting hole arranged on the end plate and a connecting bolt arranged in the connecting hole.

Further, the shell also comprises a top plate, and the top plate is covered at the opening at the upper side of the installation cavity.

The utility model has the advantages as follows:

the utility model discloses a welded connection between tip hem portion and the end plate that curb plate both ends were buckled to be used in curb plate length direction's pulling force when expanding electric core and be decomposed into two component, and only have one of them component can be used in the welding department. Through the connected mode of improving shell curb plate, the pulling force that the welding department received on the curb plate reduces when electric core inflation for the solder joint keeps firmly to be difficult to drop lastingly, has prolonged the life-span of battery module normal use.

Drawings

Fig. 1 is a perspective view of a housing of a battery module according to the present invention;

fig. 2 is an exploded view of a housing of a battery module according to the present invention;

fig. 3 is a structural diagram of a side plate of a housing of a battery module according to the present invention when the side plate is connected to an end plate;

fig. 4 is a structural diagram of a battery module according to the present invention when a side plate and an end plate of a housing are disassembled;

fig. 5 is a diagram illustrating a connection relationship between a side plate and a side insulating plate of a housing of a battery module according to the present invention;

fig. 6 is a connection relationship diagram of the end plate and the end insulating plate of the housing of the battery module according to the present invention.

Names and designations of parts

1: a side plate;

2: an end plate;

3: a cushioning rubber pad;

4: a top plate;

5: a connecting bolt;

10: a mounting cavity;

11: an end hem portion;

12: an upper hem portion;

13: a lower hem portion;

14: heat dissipation holes;

101: a side insulating plate;

201: an end insulating plate.

Detailed description of the preferred embodiments

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

Examples

Referring to fig. 1-6, an embodiment of the utility model discloses a shell of battery module, including curb plate 1 and end plate 2, end plate 2 is equipped with two, curb plate 1 is equipped with two, two curb plate 1 and two side plate 2 is around establishing lower side open-

ended installation cavity

10, 1 both ends of curb plate are equipped with the tip hem portion 11 towards 2 lateral buckling of end plate, tip hem portion 11 overlap joint in the end plate 2 outside, tip hem portion 11 with welded connection between the end plate 2.

The mounting cavity 10 is used for mounting the battery cell of the battery module, and the shell is used for wrapping the plurality of battery cells at the outer side to enable the battery cells to be connected into a whole and play a role in protection. The electric core is installed in the installation cavity and must be guaranteed to be in close contact with the electric core in order to prevent the electric core from moving in a dislocation way caused by vibration in the use process. However, because aluminum battery's characteristic, the battery core has 7% thickness inflation after the long-term work of battery module, and this just causes originally the installation cavity variation volume that closely fills up the battery core inadequately, makes between battery core and the battery core, forms the power of mutual extrusion between battery core and the shell, and this power is exerted on curb plate 1 when mainly embodying along the tension of 1 length direction of curb plate, when acting on end plate 2, represents the pulling force between curb plate 1 and the end plate 2.

Because the end folding parts 11 are arranged at the two ends of the side plate 1, the outer sides of the end plates 2 are overlapped through the end folding parts 11 and are welded, so that the pulling force is decomposed into two component forces at the joint position of the side plate 1 and the end plates 2, wherein one component force is along the length direction of the side plate 1, the other component force is along the extending direction of the end folding parts 11, and only the component force along the extending direction of the end folding parts 11 can act on the welding position, and therefore, the acting force applied to the welding position is reduced compared with the prior art.

In addition, the magnitude of the component force acting in the extending direction of the end hem portion 11 can be changed by designing the angle at which the end hem portion 11 is bent, and the component force is smaller as the bending angle is larger. In this embodiment, the end portion hem 11 is formed by bending the end portion of the side panel 1 by 90 degrees, that is, the bending angle of the end portion hem 11 is 90 degrees, and a corresponding position where the end panel 2 overlaps the end portion hem 11 is set to be a vertically flush surface. In other embodiments, the end portion hem portion 11 may be formed by bending the end portion of the side panel 1 by more than 90 degrees, that is, the bending angle of the end portion hem portion 11 is more than 90 degrees, in which case the magnitude of the component force acting in the extending direction of the end portion hem portion 11 is smaller, but in this case, a vertically inclined surface is provided at a position where the end panel 2 overlaps the end portion hem portion 11 to be adapted to the end portion hem portion 11.

In this embodiment, the side plate 1 is made of an aluminum plate, and a side insulating plate 101 is provided on the inner side of the side plate 1. Aluminum plate has advantages such as light, intensity height, but aluminum plate has electric conductivity, consequently, makes with aluminum plate curb plate 1 can improve the intensity of shell, alleviates the weight of shell, sets up lateral part insulating board 101 in the inboard of curb plate 1 in addition, plays insulating effect, reduces the risk that battery module takes place the electric leakage. Similarly, the end plate 2 is made of aluminum plate, and the inner side of the end plate 2 is provided with an end insulating plate 201.

The side insulating plate 101 and the end insulating plate 201 are used for insulation, and electric conduction between the electric core and the aluminum side plate 1 and between the electric core and the aluminum end plate 2 is avoided when the electric core is installed in the installation cavity. Therefore, the side insulating plates 101 and the end insulating plates 201 are both made of PC board, which is a thin sheet of polycarbonate material and has excellent E (120 ℃) class insulating properties, and in addition, it has particularly good impact strength, thermal stability and flame retardant properties, so that the use of PC board for insulation between the side plates 1 and the cells and between the end plates 2 and the cells improves the overall performance of the case.

The shell further comprises a top plate 4, and the top plate 4 covers the opening at the upper side of the installation cavity. The top plate 4 is provided with a PC sheet for insulating the top of the housing.

A plurality of heat dissipation holes 14 are formed in the side plate 1, and the heat dissipation holes 14 are beneficial to outward heat dissipation of the installation cavity. Further, an upper side folded edge portion 12 and a lower side folded edge portion 13 which are bent towards one side of the installation cavity are respectively arranged on the upper side and the lower side of the side plate 1, and the upper side folded edge portion 12 is flush with the upper end of the end insulating plate 201. Wherein, the lower folded edge part 13 is used for connecting the components at the lower opening of the installation cavity 10; upside hem portion 12 and tip insulation board 201 upper end parallel and level, locate when roof 4 lid during the upside opening part of installation cavity, the board lid downside butt respectively on upside hem portion 12 and tip insulation board 201 upper end, and upside hem portion 12 and tip insulation board 201 support jointly the board lid.

In this embodiment, the shell is provided with a cushioning rubber pad 3 at the lower opening of the installation cavity 10, wherein the cushioning rubber pad 3 is attached with glue on one side and is adhered to the bottom of the lower hem part 13; in other embodiments, the housing is provided with a heating sheet at the lower opening of the mounting cavity 10, and the heating sheet is overlapped on the lower hem part 13.

Be equipped with on the end plate 2 and be used for fixing the connection structure of shell, connection structure is including locating connecting hole on the end plate 2 and locating connecting bolt 5 in the connecting hole. When the shell is fixed, the threaded end of the connecting bolt 5 is matched and connected with the corresponding threaded structure.

To sum up, the utility model discloses a welded connection between tip hem portion 11 and the end plate 2 that the 1 both ends of curb plate were buckled to be used in 1 length direction's of curb plate pulling force when expanding electric core and be decomposed into two component, and only one of them component can be used in the welding department. Through improving the connected mode of shell curb plate 1, the pulling force that the welding department received on curb plate 1 reduces when electric core inflation for the solder joint keeps firmly to be difficult to drop lastingly, has prolonged the life-span of battery module normal use.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a shell of battery module, includes curb plate and end plate, the end plate is equipped with two, the curb plate is equipped with two, two curb plate and two the end plate is around establishing into upside open-ended installation cavity down, its characterized in that, the curb plate both ends are equipped with the tip hem portion of buckling towards end plate one side, tip hem portion overlap joint in the end plate outside, tip hem portion with welded connection between the end plate.

2. The battery module case according to claim 1, wherein the end beading portions are formed by bending the side plate ends by not less than 90 degrees.

3. The battery module case according to claim 1 or 2, wherein the side plates are provided as aluminum plates, and side insulating plates are provided at the inner sides of the side plates.

4. The battery module case according to claim 3, wherein the end plates are formed of an aluminum plate, and end insulating plates are provided on the inner sides of the end plates.

5. The battery module case according to claim 4, wherein the side insulating plates and the end insulating plates are each provided as a PC board.

6. The battery module case according to claim 4 or 5, wherein the case is provided with a cushion rubber pad or a heating sheet at a lower opening of the mounting cavity.

7. A housing for a battery module as set forth in claim 1, wherein said side plate is provided with a plurality of heat dissipation holes.

8. The battery module case according to claim 6, wherein the side plates are provided at upper and lower sides thereof with upper and lower folded edges, respectively, which are folded toward the mounting cavity, the lower folded edge being used to connect the cushion rubber gasket or the heating sheet, and the upper folded edge being flush with the upper end of the end insulating plate.

9. The battery module case according to claim 1, wherein the end plates are provided with coupling structures for fixing the case, the coupling structures including coupling holes provided in the end plates and coupling bolts provided in the coupling holes.

10. The battery module case of claim 1, wherein the case further comprises a top plate covering the upper opening of the mounting cavity.