CN209804783U

CN209804783U - Power battery system

Info

Publication number: CN209804783U
Application number: CN201822119285.7U
Authority: CN
Inventors: 孙猛; 王大伟; 潘耀强; 牛月赞
Original assignee: Zhejiang Xinchuang Energy Co Ltd
Current assignee: Zhejiang Xinchuang Energy Co Ltd
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2019-12-17
Anticipated expiration: 2028-12-17

Abstract

The utility model relates to a power battery system, including battery box, the battery module and the battery case lid of establishing ties, the battery module includes monomer electricity core, carries out secondary parallel connection between the monomer electricity core. The utility model discloses a power battery system is in groups through the mode of the many and few clusters of electric core to realize low-voltage high-capacity purpose. The voltage of the battery system is reduced, and the capacity of the battery is improved, so that the energy supply of the battery is ensured, the safe voltage is reduced, the safety of the product in the manufacturing and using processes is improved, and the energy utilization rate is improved to a certain extent.

Description

Power battery system

Technical Field

The utility model relates to a power battery system.

Background

The lithium ion power battery technology is mature at present, and is accepted by more consumers when being applied to the field of passenger vehicles. For consumers, the attention angles are diversified, such as endurance mileage, charging efficiency, safety during use, and the like. The central importance of the method is the guarantee of the safety of the power battery system. Most of electric vehicles in the market at the present stage are provided with a battery system which is a high-voltage low-capacity scheme, the requirement on safety protection measures of a power battery system is relatively high, and under the condition of potential electric leakage, operation workers or driving vehicle personnel are easily electrically injured due to high voltage, the temperature rises rapidly under the condition of short circuit, and even larger explosion sparks are caused to cause serious injury to the personnel.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a power battery system, including battery box, the battery module and the battery case lid of establishing ties, its characterized in that, the battery module includes monomer electricity core, carries out secondary parallel connection between the monomer electricity core.

Furthermore, the single battery cores are connected in parallel through the confluence aluminum bar, and then connected in parallel through the parallel connection connecting sheet.

Further, the aluminum busbar is connected in parallel with the battery cell through laser welding.

Furthermore, the parallel connection connecting piece is a flat copper sheet, waist holes are formed in two ends of the flat copper sheet, and the parallel battery cell modules are connected in parallel through the pressing riveting studs and the nuts on the bus aluminum bars.

Furthermore, the battery modules are connected in series through a series connection piece.

further, still include high-voltage device and BMS management system, high-voltage device and BMS management system all integrate in the box.

further, the battery module of establishing ties is 13, includes 18 monomer electric cores in every battery module, 18 monomer electric cores form 6 groups, carry out parallel connection through the aluminium bar that converges in every group, and the rethread parallel connection piece carries out parallel connection between 6 groups.

The utility model discloses a mode that electric core is many and few cluster is in groups to realize low-voltage high-capacity purpose. The voltage of the battery system is reduced, and the capacity of the battery is improved, so that the energy supply of the battery is ensured, the safe voltage is reduced, the safety of the product in the manufacturing and using processes is improved, and the energy utilization rate is improved to a certain extent.

Drawings

FIG. 1 is an overall structure diagram of a power battery system according to the present invention;

FIG. 2 is a view showing the inside of the battery pack of the present invention;

Fig. 3 is a structural diagram of the battery pack module of the present invention.

Detailed Description

The present invention will be further described with reference to the following detailed description of the embodiments.

Like fig. 1, 2, the utility model relates to a low-voltage motor 48V power battery system adapted for car includes battery box 1, battery module 3, battery case lid 2, high-voltage device and BMS management system. High pressure device and BMS management system all integrate in the box, 13 identical series connection battery module are fixed in the box and arrange through the upper and lower layer that a unified support piece realized the module, use parallelly connected connection piece, different series connection piece and high pressure device to realize the partial loop connection of system's high pressure, improve space utilization. Wherein, the battery box body 1 is internally provided with a fixing hole position and a locking hole position butted with the box cover, the battery module 3 is fixed on the specific fixing hole position in the battery box body 1, and the rear end of the battery pack is provided with an external supporting structure 4 for fixing the upper module. Except the fuse 18 and the shunt 22, other electrical components in the low-voltage power battery pack are directly fixed on the box body, the external output adopts a five-channel shunt mode, power wire bundles are taken as positive and negative electrodes to be led out, and the low-voltage connector 5 is taken as a data output end.

The transverse connection mode is used for the series connection among the modules, the number of the battery modules 3 is 13, and the series connection connecting sheet 13 is used as the total positive output of the rear-end module and is fixedly connected with the press riveting stud on the bus aluminum bar 11 through a nut; the serial connection piece 14 is used as the total negative output of the rear-end module and is fixedly connected with the pressure riveting stud on the bus aluminum bar 11 through a nut; the serial connection sheet 15 is used for upper and lower layer serial connection and is fixedly connected with a press riveting stud on the bus aluminum bar 11 through a nut; the serial connection piece 16 is used as a serial connection piece for realizing the equal-interval arrangement of the modules, and is fixedly connected with the press riveting stud on the bus aluminum bar 11 through a nut. And the series connection between the more distant modules is carried out by using a series connection piece 17 through a fuse 18 for cross-distant series connection and circuit protection. The serial connection sheet 19 is used as the front end module total positive output and is fixedly connected with the press riveting stud on the bus aluminum bar 11 through a nut; the serial connection sheet 20 is used as the total negative output of the front-end module and is fixedly connected with the press riveting stud on the bus aluminum bar 11 through a nut; the series connection of the three modules included in the front module is also performed by using the series-connected pads 16. The total negative output of the front-end module is switched to a shunt 22 through a connecting sheet 21, and then is switched to a total negative bus copper plate 23 through the shunt 22, and the total negative power line 24 is installed to be used as the negative output of the whole battery. The rear-end module total positive output series connection sheet 13, the total positive rotation connection sheet 25 and the relay near module end connection sheet 26 are fixed in series through an insulation fixed support 27, the near module end connection sheet 26 is connected with the total positive relay 28, the far module end connection sheet 29 is locked with the total positive relay 28 and the total positive confluence copper plate 30 respectively, and the total positive power line 31 is installed to be used as the positive output of the whole battery. The utility model discloses single module is inside including 18 monomer electric cores, 18 monomer electric cores form the parallelly connected electric core module of 6 groups, three electric cores in every electric core module connect in parallel through converging aluminium bar 11 and electric core through laser welding, the parallelly connected electric core module of 6 groups passes through parallel connection piece and connects (not shown in the picture), parallel connection piece is a straight copper sheet, open at both ends has the waist hole, it is parallelly connected again with 6 group's electric core modules to rivet double-screw bolt and nut through the pressure on the aluminium bar that converges, realize 18 and 1 string of circuit, its main objective is balanced electric core pressure differential, be convenient for BMS information acquisition, cover at last and insulate the protection with the insulating cover.

As shown in fig. 3, the battery module 3 includes a square aluminum shell battery cell 6, an aluminum side plate 7, an aluminum end plate 8, a plastic photo frame 32, an insulating sheet 9, an insulating cover 10, a bus aluminum bar 11, and foam 12. Need increase the pretightning force of certain size when electric core and end plate transversely pile up, it cushions and the roughness is filled as the module extrusion force in groups to fill a bubble cotton 12 between every 3 electric cores, plastics photo holder frame 32 is as the inside insulating inoxidizing coating in module both sides, rethread aluminium curb plate 7 carries out laser welding fixed module form with aluminium end plate 8, will converge aluminium bar 11 and insulating piece 9 and carry out the pre-installation, cover again in electric core utmost point post top, get up 11 with electric core utmost point post welding of collection flow aluminium bar through laser welding, it corresponds the insulating lid 10 that the double-screw bolt position trompil was riveted to the top pressure again to cover the top and carries out.

The utility model discloses a high-voltage device is including always positive relay, fuse and shunt, always positive relay adopts 3 relay parallel connection, realizes the function of constant voltage reposition of redundant personnel to reduce the requirement of low-voltage high capacity to always positive relay.

As the utility model discloses the adaptation is in the improvement of the power battery of low-voltage motor 48V for the car, battery box is whole, the case lid is by sheet metal material welded forming, and the bottom half is complemented through welded fastening realization battery box's bottom intensity by the several font strengthening ribs that link to each other with hangers is integrative.

Claims

1. The utility model provides a power battery system, includes battery box, the battery module and the battery case lid of establishing ties, its characterized in that, the battery module includes monomer electricity core, carries out secondary parallel connection between the monomer electricity core.

2. The power battery system of claim 1, wherein the individual cells are connected in parallel by aluminum busbars and then connected in parallel by parallel connection tabs.

3. The power cell system of claim 2, wherein the parallel connection via aluminum buss bars is laser welded from the aluminum buss bars to the cells.

4. The power battery system of claim 2, wherein the parallel connection piece is a flat copper sheet with waist holes at both ends, and the parallel cell modules are connected in parallel again through a riveting stud and a nut on the aluminum busbar.

5. The power cell system of claim 4, wherein the series connection between the battery modules is through a series connection tab.

6. The power battery system of any of claims 1-5, further comprising a high voltage device and a BMS management system, both integrated within the housing.

7. The power battery system of any one of claims 1-5, wherein the number of the battery modules connected in series is 13, each battery module comprises 18 single battery cells, the 18 single battery cells form 6 groups, each group is connected in parallel through a busbar, and the 6 groups are connected in parallel through a parallel connecting piece.