HK1181553A - Battery pack for electric vehicles - Google Patents

Abstract

The present invention relates to a battery pack for electric vehicles. The battery pack comprises: a housing, in which an area for battery group and an area for accessories are provided, and a heat abstractor is installed on the housing; a battery group, which includes plurality of battery units is placed in the area for battery group, the battery unit is a basic battery module that comprises plurality of single batteries and frames for battery; management component for battery, which is connected with the battery group, is placed in the area for accessories. According to the battery pack for electric vehicles of this invention, the battery group, and kinds of accessories such as the management component for battery can be arranged in the battery pack for electric vehicles, in this way, the battery pack can be provided with more function, moreover, the modularization of the battery units can meet the needs of electric vehicles in size, voltage, volume and safety of the battery pack by assembling the battery units in different way.

Description

Battery pack for electric automobile

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a battery pack for an electric automobile.

Background

The battery is a key component of the electric automobile as a main energy storage element of the electric automobile, and directly influences the performance of the electric automobile. In order to facilitate the arrangement of the battery in the electric vehicle, a plurality of batteries are integrated into one battery pack by manufacturers of the electric vehicle at present in a manner of placing the battery in the battery pack, and then the battery pack is mounted on the electric vehicle to supply power to the electric vehicle. However, the battery pack is only used for accommodating the battery, has a single function, and many components used with the battery pack need to be additionally connected with the battery pack, so that the arrangement of the components in the electric vehicle is complex, the efficiency is low, and the maintenance work is not facilitated.

Therefore, there is a need for a battery pack for an electric vehicle to solve the problems in the prior art.

Disclosure of Invention

In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a battery pack for an electric vehicle, comprising: the battery pack storage device comprises a shell, a battery pack storage area and an auxiliary component storage area are arranged in the shell, and a heat dissipation device is further arranged on the shell; the battery pack comprises a plurality of battery units and is arranged in the battery pack placing area of the shell, and the battery units are basic battery modules comprising a plurality of single batteries and a battery rack; a battery management part connected with the battery pack and disposed within the auxiliary part placement region of the case.

Preferably, the case includes a bottom case and an upper cover, wherein the battery pack placement region and the auxiliary component placement region are provided in the bottom case.

Preferably, a baffle is provided in the battery pack placing region of the bottom case, and a positioning hole is provided in the baffle.

Preferably, a plurality of first positioning pins are provided at both sides of the baffle.

Preferably, a plurality of second positioning pins are provided in the auxiliary component placing region of the bottom case.

Preferably, an interface assembly is further disposed on the side wall of the bottom case, and a junction box used in cooperation with the interface assembly is disposed in the auxiliary component placement area.

Preferably, an emergency brake switch connected with the battery pack is provided on a side wall of the bottom case.

Preferably, the positive electrode and the negative electrode of the unit cell are connected to the cell holder, and an end cap is mounted on the cell holder.

Preferably, a plurality of mounting grooves for mounting a battery pack frame are provided on a side wall of the battery holder.

Preferably, a conductive plate is further provided between the battery holder and the end cap.

Preferably, a copper sheet is disposed at a connection position of the battery holder and the conductive plate.

Preferably, a groove is formed in the top of the battery rack, a connecting block is arranged in the groove, and the copper sheet is mounted on the connecting block.

Preferably, the heat dissipating device includes a plurality of heat dissipating fans and a plurality of air inlet holes.

According to the battery pack for the electric vehicle, the battery pack placing area and the auxiliary component placing area are arranged in the shell, so that the battery pack and various auxiliary components such as a battery management component can be arranged in the battery pack, the battery pack can integrate more functions, and the design method of modularization of the battery units can meet the requirements of different electric vehicles on the size, voltage, capacity, safety and the like of the battery pack through different combinations of the battery units.

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a schematic structural view of a battery pack for an electric vehicle according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a bottom case of a battery pack for an electric vehicle according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a battery pack for an electric vehicle according to an embodiment of the present invention;

FIG. 4 is an exploded view of a battery cell and a battery holder;

FIG. 5 is a schematic diagram of an assembly structure of a single battery and a battery rack;

FIG. 6 is an exploded view of the conductive plate and the battery holder;

fig. 7 is an exploded structural view of the battery cell.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, a detailed construction will be set forth in order to provide a thorough understanding of the present invention. It is apparent that the invention may be practiced without limitation to the specific details known to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

The present invention discloses a battery pack for an electric vehicle, which mainly includes a case, a battery pack 30, and a battery management part (not shown), as shown in fig. 1. The casing may be a separate structure or an integrated structure with a cover, and a heat sink is further provided on the casing to dissipate heat from the battery pack 30. The housing shown in fig. 1 includes a bottom case 10 and an upper cover 50, the bottom case 10 has a bottom plate and a sidewall provided on the bottom plate, and the upper cover 50 is provided on the bottom case 10 to assemble a complete housing. The bottom chassis 10 is configured as shown in fig. 2, a battery pack placing region 11 for placing a battery pack 30 and an auxiliary component placing region 13 for placing auxiliary components such as a battery management component are provided in the bottom chassis 10, and a plurality of heat dissipation fans 15 for discharging heat in the battery pack are further provided on the side walls of the bottom chassis 10. The battery pack 30 is disposed in the battery pack placement region 11 of the bottom case 10, and the battery pack 30 has a structure including a plurality of battery cells 70 as shown in fig. 3. Returning to fig. 1, the battery management part is disposed in the auxiliary part placement region 13 of the bottom case 10, and is connected to the battery pack 30 disposed in the battery pack placement region 11, so as to achieve accurate estimation of the state of charge of the battery pack 30, dynamic monitoring of the operating state of the battery pack 30, and equalizing charge of the battery pack 30. The upper cover 50 is covered on the bottom case 10, and is fixed to the bottom case 10 by screwing into the bottom case 10 through the screw insertion holes 51 of the upper cover 50 using screws, and a plurality of air inlet holes 53 are formed in the upper cover 50, and the air inlet holes 53 allow clean cold air to enter the inside of the battery pack to cool the battery pack 30, while heat generated from the battery pack 30 is discharged to the outside of the battery pack by a plurality of heat dissipation fans 15 provided on the side walls of the bottom case 10. The plurality of heat dissipation fans 15 and the plurality of air inlet holes 53 mentioned herein constitute a heat dissipation device disposed on the housing, and the aforementioned arrangement positions of the plurality of heat dissipation fans 15 and the air inlet holes 53 are merely exemplary, and in practical applications, the plurality of heat dissipation fans 15 may be disposed on the side wall of the bottom housing 10, or may be disposed on the upper cover 50, and similarly, the plurality of air inlet holes 53 may be disposed on the side wall of the bottom housing 10, or may be disposed on the upper cover 50.

In a preferred embodiment of the present invention, as shown in fig. 2, a barrier 17 is provided in the battery pack placement region 11 of the bottom case 10, the barrier 17 dividing the battery pack placement region 11 into two sections, each of which is to place the battery pack 30, so that the arrangement of the battery packs 30 in the battery pack placement region 11 is more orderly. As can also be seen from fig. 2, a plurality of positioning holes 171 for positioning the battery packs 30 are provided on the shutter 17 to facilitate stacking of the battery packs 30.

Still referring to fig. 2, it is further preferable that a plurality of first positioning pins 19 may be further added to both sides of the baffle 17, and these first positioning pins 19 are also used to position the battery pack 30. In this way, the plurality of first positioning pins 19, together with the plurality of positioning holes 171, position the battery packs 30, further ensuring correct and orderly stacking of the battery packs 30 in the battery pack placement region 11.

In order to facilitate the installation of auxiliary components such as battery management components in the auxiliary component placement area 13 of the bottom case 10, it can be seen from fig. 2 that a plurality of second positioning pins 12 are provided in the auxiliary component placement area 13, and these second positioning pins 12 are used for positioning the installation of the auxiliary components such as battery management components in the auxiliary component placement area 13, so that the auxiliary components can be correctly and orderly stacked in the auxiliary component placement area 13.

Referring to fig. 1 again, preferably, in order to provide the battery pack for the electric vehicle provided by the present invention with more functions, an interface assembly may be further added on a sidewall of the bottom case 10, and the interface assembly may specifically include a charging socket 141, a power line connector 143, and a signal line socket 145. The charging socket 141 is used for charging the battery pack 30, the power line connector 143 and the signal line socket 145 are respectively used for connecting with a power line and a signal line to realize power supply and communication of the battery pack, and a protective rubber head (not shown) can be sleeved on the power line connector 143 to prevent danger caused by human hands contacting with metal parts of the power line connector 143. In addition, a terminal box 16 used in cooperation with the interface assembly is further disposed in the auxiliary component placing region 13 of the bottom case 10, so that the wires connected to the charging socket 141, the power line connector 143, and the signal line socket 145 can be accommodated in the terminal box 16, thereby preventing the wires from being randomly arranged in the battery pack and ensuring the tidiness of the inside of the battery pack.

In another preferred embodiment of the present invention, in order to cut off the power supply to the outside in an emergency situation, as shown in fig. 1, an emergency stop switch 18 is provided on a side wall of the bottom case 10, so that the current of the battery pack can be cut off by the emergency stop switch 18 in an emergency situation, thereby ensuring the safety of the battery pack.

The specific structure of the battery pack 30 will be described below with reference to the drawings.

Referring first to fig. 3, the battery pack 30 includes a plurality of battery cells 70, and the battery cells 70 are basic battery modules including a plurality of unit batteries 71 and a battery holder 73 shown in fig. 4. In which adjacent two battery cells 70 are connected first by the top bus bar 31, so that a plurality of battery cells 70 are assembled into the battery pack 30. In order to ensure that the plurality of battery cells 70 are tightly and firmly connected as a whole, a battery frame 33 is provided outside the battery pack 30, and the battery frame 33 surrounds the battery pack 30 to play a role of clamping the connection between the battery cells 70.

The structure of the battery cell 70 and the assembly process of the battery cell 70 will be described next with reference to fig. 4 to 7.

In fig. 4, the unit cell 71 of the battery unit 70 and the battery holder 73 are shown, and both the positive electrode and the negative electrode of the unit cell 71 are connected to the battery holder 73. Specifically, each battery rack 73 is provided with mounting posts 731, wherein one of the mounting posts 731 is formed with a threaded hole, and the other mounting post 731 is formed with a through hole. After the battery holder 73 is mounted to the positive and negative electrodes of the unit battery 71, the mounting posts 731 of the two battery holders 73 are aligned, and the battery holder 73 is fixed to the positive and negative electrodes of the unit battery 71 by using bolts 90 inserted through the mounting posts 731 formed with through holes and screwed into threaded holes of the other mounting post 731. Subsequently, the end caps 20 may be mounted on the two battery holders 73, respectively, according to the embodiment shown in fig. 7, thereby completing the assembly of one battery unit 70.

With respect to a preferred arrangement of the battery rack 73, referring to fig. 3, it is mentioned that after a plurality of battery units 70 are assembled into the battery pack 30, a battery pack frame 33 is arranged on the battery pack 30, and for facilitating the installation of the battery pack frame 33, a plurality of installation grooves 733 may be preferably formed on the side wall of the battery rack 73, so that the parts of the battery pack frame 33 along the longitudinal direction of the battery pack 30 can be installed in the installation grooves 733, thereby ensuring the firmness of the battery pack frame 33 and limiting the relative displacement between the battery pack frame 33 and the battery pack 30.

Preferably, a conductive plate 40 may be provided between the end cap 20 and the battery holder 73 according to the embodiment shown in fig. 6. As to how the conductive plate 40 is disposed between the end cap 20 and the battery holder 73, referring to fig. 6, the plurality of insert pins 41 of the conductive plate 40 are first inserted into the longitudinal grooves 739 of the battery holder 73 and then fixed to the top of the battery holder 73 by screws. The structure of the conductive plate 40 after being connected to the battery holder 73 can be seen in fig. 7.

For two adjacent conductive plates 40 disposed on the same side, the copper sheets 60 shown in fig. 5 may be used for connection. Fig. 5 shows an installation manner of the copper sheet 60, in which a groove 735 is first formed on the battery holder 73, a connection block 737 is then installed in the groove 735, a threaded hole is formed on the connection block 737, and a through hole needs to be processed on the copper sheet 60. In this way, when assembling, the conductive plate 40, the copper sheets 60 and the battery holder 73 are integrally connected by using screws which pass through the conductive plate 40 and the copper sheets 60 from top to bottom and then are screwed into the threaded holes of the connecting block 737.

In summary, the battery pack for an electric vehicle according to the present invention has the battery pack placement region and the auxiliary component placement region disposed in the housing, so that the battery pack and various auxiliary components such as the battery management component can be disposed in the battery pack, the battery pack can integrate more functions, and the design method of the battery unit modularization can meet the requirements of different electric vehicles on the size, voltage, capacity, safety and the like of the battery pack through different combinations of the battery units.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (13)

1. A battery pack for an electric vehicle, comprising:

the battery pack storage device comprises a shell, a battery pack storage area and an auxiliary component storage area are arranged in the shell, and a heat dissipation device is further arranged on the shell;

the battery pack comprises a plurality of battery units and is arranged in the battery pack placing area of the shell, and the battery units are basic battery modules comprising a plurality of single batteries and a battery rack;

a battery management part connected with the battery pack and disposed within the auxiliary part placement region of the case.

2. The battery pack for an electric vehicle according to claim 1, wherein the case includes a bottom case and an upper cover, wherein the battery pack placement region and the auxiliary component placement region are provided in the bottom case.

3. The battery pack for an electric vehicle according to claim 2, wherein a stopper is provided in the battery pack placing region of the bottom case, and positioning holes are provided in the stopper.

4. The battery pack for an electric vehicle according to claim 3, wherein a plurality of first positioning pins are provided at both sides of the blocking plate.

5. The battery pack for an electric vehicle according to claim 2, wherein a plurality of second positioning pins are provided in the auxiliary component placing region of the bottom case.

6. The battery pack for an electric vehicle according to claim 2, wherein an interface assembly is provided on a side wall of the bottom case, and a terminal box used in cooperation with the interface assembly is provided in the auxiliary component placing region.

7. The battery pack for electric vehicles according to claim 2, wherein an emergency brake switch connected to the battery pack is provided on a side wall of the bottom case.

8. The battery pack for electric vehicles according to claim 1, wherein the positive and negative electrodes of the unit cells are attached to the battery holder, and an end cap is mounted on the battery holder.

9. The battery pack for electric vehicles according to claim 8, wherein a plurality of mounting grooves for mounting a battery pack frame are provided on a side wall of the battery holder.

10. The battery pack for an electric vehicle according to claim 8, wherein a conductive plate is further provided between the battery holder and the end cap.

11. The battery pack for electric vehicles according to claim 10, wherein a copper sheet is provided at the junction of the battery holder and the conductive plate.

12. The battery pack for electric vehicles according to claim 11, wherein a groove is provided at the top of the battery holder, a connection block is provided in the groove, and the copper sheet is mounted on the connection block.

13. The battery pack for electric vehicles according to claim 1, wherein the heat dissipating means comprises a plurality of heat dissipating fans and a plurality of air inlet holes.