CN216563313U

CN216563313U - Power battery system

Info

Publication number: CN216563313U
Application number: CN202123300833.4U
Authority: CN
Inventors: 刘瑞
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-05-17
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a power battery system, which relates to the technical field of power batteries and comprises a box body, a separation beam, a module bus output bar, an insulation base and a bus bar, wherein the separation beam is arranged on the box body; the separation beam is fixedly connected inside the box body, and divides the internal cavity of the box body into a plurality of module placing cavities; placing a module in each module placing cavity, wherein the separation beam is used as an end plate of the module; the positive and negative poles of each module are led out through the module busbar output bar, an insulating base is installed at the connecting position of the corresponding two adjacent modules on the separation beam, and the busbar is installed on the insulating base and fixedly connected with the corresponding two module busbar output bars. The utility model has the advantages that: the module design is simplified, the module grouping efficiency is improved, the volume utilization rate in the battery pack can be effectively improved, and therefore the volume energy density is improved.

Description

Power battery system

Technical Field

The utility model relates to the technical field of power batteries, in particular to a power battery system.

Background

In the prior art, the grouping efficiency of the conventional battery pack is a bottleneck for improving the energy density of the battery system. In the traditional technical scheme, the number of modules is large, and the number of parts is large, so that the grouping efficiency is reduced; and the more parts will cause the more complicated degree of the process and the high manufacturing cost. Traditional module adopts aluminium end plate and electric core fixed connection, and the produced power of electric core inflation bears the weight of the object as, has caused module spare part quantity and kind more to the positive negative pole that traditional module was drawn forth is by overflowing piece direct fixed connection on the module, and these all cause the efficiency in groups of module to be lower.

Patent document No. CN109742281A discloses a battery box, which is provided with a reinforcing beam on a pair of opposite side plates of a lower box body, so that the strength of the side plates of the lower box body can be effectively enhanced, and battery cells are directly placed in the lower box body in a row.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a power battery system which improves module grouping efficiency.

The utility model solves the technical problems through the following technical means: the power battery system comprises a box body, a separation beam, a module bus output bar, an insulation base and a bus bar; the separation beam is fixedly connected inside the box body to separate the internal cavity of the box body into a plurality of module placing cavities; one module is placed in each module placing cavity, and the separation beam is used as an end plate of the module; the positive and negative poles of each module are led out through the module busbar output bar, an insulating base is installed at the connecting position of the corresponding two adjacent modules on the separation beam, and the busbar is installed on the insulating base and fixedly connected with the corresponding two module busbar output bars. The module adopts a scheme that a large module is close to a non-module, and the traditional aluminum end plate fixedly connected with the battery core is replaced by the separation beam, so that the types and the number of parts are reduced; the separation beam ensures the separation between the modules and serves as a bearing object for the module under the force generated by the expansion of the battery core, and the diffusion of thermal runaway on the module layer is effectively inhibited; meanwhile, the bus bars are installed on the insulating base, the insulating base is fixedly connected to the separating beams, the positive and negative electrodes led out by adjacent modules are connected to the separating beams through the bus bars, the bus bars are different from the traditional direct fixed connection on the modules, the bearing performance of the box body is effectively utilized, the module design is further simplified, the module grouping efficiency is improved, the module lightweight is improved, the process flow is saved, the module manufacturing cost is reduced, the volume utilization rate in a battery pack can be effectively improved, and the volume energy density is improved.

As an optimized technical scheme, the box body comprises a box cover, a box body frame and a bottom plate; the box cover and the bottom plate are respectively and fixedly connected to two sides of the box body frame to form a closed box body; the separation beam and the box body frame are of an integral structure.

As an optimized technical scheme, the power battery system further comprises a liquid cooling plate, a water cooling inlet and a water cooling outlet; the liquid cooling plate is fixedly connected between the box body frame and the bottom plate; one end of the water cooling inlet is positioned outside the box body, and the other end of the water cooling inlet penetrates into the box body and is fixedly connected with the liquid cooling plate; one end of the water-cooling outlet is positioned outside the box body, and the other end of the water-cooling outlet penetrates into the box body and is fixedly connected with the liquid cooling plate; the water-cooling inlet and the water-cooling outlet are communicated with the liquid-cooling plate.

As an optimized technical scheme, the module is bonded with the box body and the liquid cooling plate through heat-conducting structural adhesive or heat-conducting encapsulating structural adhesive.

As an optimized technical scheme, heat-insulating cotton is filled in the inner cavity of the bottom plate.

As an optimized technical scheme, the inner surface of the box cover is coated with a heat-insulating fireproof coating and attached with mica sheets. Can effectively inhibit heat diffusion

As an optimized technical scheme, the bottom plate is coated with an anti-stone-hitting coating.

As the optimized technical scheme, the module comprises a plurality of battery cores arranged together, aerogel pads and plastic end plates between the battery cores, and a metal packing belt and a plastic packing belt for packing the battery cores into a group.

As an optimized technical scheme, a BMS host, a BMS slave, a BDU assembly, a high-voltage input connector, a first high-voltage output connector, a second high-voltage output connector and a low-voltage output connector are mounted on the box body, and all modules connected in series are connected with the BMS host and the BMS slave in series through a low-voltage wiring harness assembly.

As an optimized technical scheme, an explosion-proof valve is installed on the box body.

The utility model has the advantages that: the module design is simplified, the module grouping efficiency is improved, the module lightweight is improved, the process flow is saved, the module manufacturing cost is reduced, the volume utilization rate in the battery pack can be effectively improved, and the volume energy density is improved.

Drawings

FIG. 1 is an exploded view of a power battery system according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of an insulating base of a power battery system according to an embodiment of the present invention.

FIG. 3 is a schematic top view of a power cell system in accordance with an embodiment of the present invention.

FIG. 4 is a schematic top view of a power battery system of an embodiment of the present invention with the cover removed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, the power battery system includes a box 1, a partition beam 2, a module 3, a module bus bar output 4, an insulating base 5, a bus bar 6, a liquid cooling plate 7, a water cooling inlet 8, a water cooling outlet 9, a BMS host 10, a BMS slave 11, a BDU assembly 12, a high voltage input connector 13, a first high voltage output connector 14, a second high voltage output connector 15, a low voltage output connector 16, and an explosion-proof valve 17.

The box body 1 comprises a box cover 101, a box body frame 102 and a bottom plate 103; the box cover 101 is made of alloy steel, and the inner surface of the box cover 101 is coated with a heat-insulating fireproof coating and attached with mica sheets, so that heat diffusion can be effectively inhibited; the box body frame 102 is made of aluminum profiles; the bottom plate 103 is coated with an anti-stone-hit coating; the cover 101 and the base plate 103 are fixedly attached to both sides of the case frame 102, respectively, to form a closed case 1.

The separation beam 2 is fixedly connected inside the box body 1 and is integrated with the box body frame 102 into a whole; the partition beam 2 comprises longitudinal beams and transverse beams and divides the inner cavity of the box body 1 into a plurality of module placing cavities which are arranged according to the size of the modules; the partition beam 2 adopts a reinforcing structure, and the structural strength of the box body 1 is fully ensured and high-strength bearing capacity capable of replacing the original module end plate is provided by applying aluminum materials with different strengths at different stress positions.

A module 3 is arranged in each module placing cavity, and each module 3 comprises a plurality of battery cells which are arranged together, aerogel pads among the battery cells, plastic end plates, and a metal packing belt and a plastic packing belt which pack the battery cells into a group; the module 3 adopts a design of removing end plates, and the partition beam 2 is used as an end plate of the module 3; the module 3 is bonded with the box body 1 and the liquid cooling plate 7 integrated at the bottom of the box body 1 through heat-conducting structural adhesive or heat-conducting encapsulating structural adhesive, and is different from a traditional bolt connecting structure; the front module and the rear module 3 are connected in series by signal acquisition and are uniformly output by the rear module 3, so that the arrangement difficulty of the wire harness in the system is reduced, the utilization rate of the wire harness is reduced, and the hidden danger caused by long-term use and abrasion of the wire harness is reduced.

The positive and negative poles of each module 3 are led out through a module bus output bar 4; the partition beam 2 is provided with an insulating base 5 corresponding to the connection position of two adjacent modules in an inserted manner, the busbar 6 is arranged on the insulating base 5 and fixedly connected with the busbar output bars 4 of the two corresponding modules, and the modules 3 are connected in series through the busbar 6 to ensure the electric connection of the whole system; the module busbar output bar 4 adopts a local copper-aluminum composite piece, and the busbar 6 adopts a copper bar, so that the electrochemical corrosion reaction generated by electric connection can be effectively inhibited.

The box body 1 adopts an integrated liquid cooling scheme, a liquid cooling plate 7 is fixedly connected between a box body frame 102 and a bottom plate 103 through an FDS (fully drawn yarn) process, and heat-insulating cotton is filled in an inner cavity of the bottom plate 103; one end of the water-cooling inlet 8 is positioned outside the box body 1, and the other end of the water-cooling inlet penetrates into the box body 1 and is fixedly connected with the liquid cooling plate 7; one end of the water-cooling outlet 9 is positioned outside the box body 1, and the other end penetrates into the box body 1 and is fixedly connected with the liquid cooling plate 7; the water-cooling inlet 8 and the water-cooling outlet 9 are both communicated with the liquid cooling plate 7.

The BMS host 10, the BMS slave 11, the BDU assembly 12, the high-voltage input connector 13, the first high-voltage output connector 14, the second high-voltage output connector 15, the low-voltage output connector 16 and the explosion-proof valve 17 are mounted on the box body 1; each module 3 connected in series is connected with the BMS host 10 and the BMS slave 11 in series through a low-voltage wire harness assembly, so that low-voltage information is transmitted; the high-voltage input connector 13 is used for inputting external high voltage, the first high-voltage output connector 14 and the second high-voltage output connector 15 are respectively used for outputting high voltage to the front wheel and the rear wheel, and the low-voltage output connector 16 is used for outputting low voltage to the whole vehicle.

The working principle of the power battery system is as follows: the module 3 adopts a scheme that a large module is close to a non-module, and the traditional aluminum end plate fixedly connected with the battery core is replaced by the separation beam 2, so that the types and the number of parts are reduced; the separation beam 2 ensures the separation between the modules 3 and serves as a bearing object for the module 3 under the force generated by the expansion of the battery core, and the diffusion of thermal runaway on the layer of the module 3 is effectively inhibited; meanwhile, the busbar 6 is installed on the insulating base 5, the insulating base 5 is fixedly connected on the separating beam 2, the positive and negative poles led out by the adjacent modules 3 are connected on the separating beam 2 through the busbar 6, the traditional direct fixed connection on the modules 3 is distinguished, the bearing performance of the box body 1 is effectively utilized, the module design is further simplified, the module grouping efficiency is improved, the module lightweight is improved, the process flow is saved, the module manufacturing cost is reduced, the volume utilization rate in a battery pack can be effectively improved, and therefore the volume energy density is improved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A power battery system, characterized in that: the device comprises a box body, a separation beam, a module bus output bar, an insulating base and a bus bar; the separation beam is fixedly connected inside the box body to separate the internal cavity of the box body into a plurality of module placing cavities; one module is placed in each module placing cavity, and the separation beam is used as an end plate of the module; the positive and negative poles of each module are led out through the module busbar output bar, an insulating base is installed at the connecting position of the corresponding two adjacent modules on the separation beam, and the busbar is installed on the insulating base and fixedly connected with the corresponding two module busbar output bars.

2. The power cell system of claim 1, wherein: the box body comprises a box cover, a box body frame and a bottom plate; the box cover and the bottom plate are respectively and fixedly connected to two sides of the box body frame to form a closed box body; the separation beam and the box body frame are of an integral structure.

3. The power cell system of claim 2, wherein: the power battery system also comprises a liquid cooling plate, a water cooling inlet and a water cooling outlet; the liquid cooling plate is fixedly connected between the box body frame and the bottom plate; one end of the water cooling inlet is positioned outside the box body, and the other end of the water cooling inlet penetrates into the box body and is fixedly connected with the liquid cooling plate; one end of the water-cooling outlet is positioned outside the box body, and the other end of the water-cooling outlet penetrates into the box body and is fixedly connected with the liquid cooling plate; the water-cooling inlet and the water-cooling outlet are communicated with the liquid-cooling plate.

4. The power cell system of claim 3, wherein: the module passes through heat conduction structure glue or heat conduction embedment structure glue with the box and the bonding of liquid cooling board.

5. The power cell system of claim 3, wherein: and heat insulation cotton is filled in the inner cavity of the bottom plate.

6. The power cell system of claim 2, wherein: the inner surface of the box cover is coated with a heat-insulating fireproof coating and attached with a mica sheet.

7. The power cell system of claim 2, wherein: the bottom plate is coated with an anti-stone-hitting coating.

8. The power cell system of claim 1, wherein: the module comprises a plurality of battery cells arranged together, an aerogel pad and a plastic end plate between the battery cells, and a metal packing belt and a plastic packing belt which pack the battery cells into a group.

9. The power cell system of claim 1, wherein: the BMS main machine, the BMS slave machine, the BDU assembly, the high-voltage input connector, the first high-voltage output connector, the second high-voltage output connector and the low-voltage output connector are mounted on the box body, and all modules connected in series are connected with the BMS main machine and the BMS slave machine in series through the low-voltage wiring harness assembly.

10. The power cell system of claim 1, wherein: and the box body is provided with an explosion-proof valve.