CN218039552U

CN218039552U - Battery assembly and vehicle

Info

Publication number: CN218039552U
Application number: CN202220874557.8U
Authority: CN
Inventors: 吴迪; 胡恺鹏; 肖聪; 史智宏
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-12-13
Anticipated expiration: 2032-04-08

Abstract

An embodiment of the utility model provides a battery assembly and vehicle. The battery assembly comprises a battery core stack, a first cooling plate and a lower box body, wherein the battery core stack is composed of a plurality of cylindrical battery cores, the first cooling plate is arranged above the battery core stack and is rigidly connected with the cylindrical battery cores in the battery core stack, and the lower box body is provided with a plurality of accommodating cavities for accommodating the battery core stack. The battery cell stack composed of a plurality of cylindrical battery cells is directly accommodated in the accommodating cavity of the lower box body, so that a side plate structure and an end plate structure in the traditional module are omitted, and the space utilization rate and the energy density in the battery assembly are improved.

Description

Battery assembly and vehicle

Technical Field

The utility model relates to a new energy automobile makes technical field, in particular to battery assembly and a vehicle.

Background

With the gradual development of new energy automobiles, the integration requirement of the power battery assembly of the new energy automobile is higher and higher. At present, the integration mode of the power battery assembly generally adopts a plurality of independent VDA (v band DER auto automotive association) standard modules for integration. However, the VDA standard module has a complicated structure, many parts, and a battery assembly having a low space utilization rate and a low energy density.

Disclosure of Invention

In view of the above, embodiments of the present invention provide a battery assembly and a vehicle that at least partially solve the above problems.

In a first aspect, an embodiment of the present invention provides a battery assembly, including:

the battery cell stack consists of a plurality of cylindrical battery cells;

the first cooling plate is arranged above the cell stack and is rigidly connected with the cylindrical cells in the cell stack;

and the lower box body is provided with a plurality of accommodating cavities for accommodating the electric core stacks.

In a second aspect, embodiments of the present invention provide a vehicle, including the battery assembly of the above embodiments.

The utility model discloses the technical scheme of each embodiment can realize at least one in the following advantage: the battery cell stack composed of a plurality of cylindrical battery cells is directly accommodated in the accommodating cavity of the lower box body, so that a side plate structure and an end plate structure in the traditional module are omitted, and the space utilization rate and the energy density in the battery assembly are improved.

In addition, the first cooling plate is arranged above the cell stack and is rigidly connected with the cylindrical cell in the cell stack, so that on one hand, the cylindrical cell and the connecting piece at the upper part of the cell stack are cooled by the first cooling plate, the damage to the battery assembly caused by the heat released by the battery assembly due to charging and discharging can be avoided, and the use safety and the service life of the battery assembly are improved; on the other hand, the first cooling plate is rigidly connected with the cylindrical battery cell in the battery cell stack, so that the rigidity of the whole structure of the battery cell stack is improved, and the mechanical performance and the anti-vibration capability of the battery assembly are improved.

Drawings

Fig. 1 is an exploded view of a battery assembly according to an embodiment of the present invention;

fig. 2 is one of the schematic views of a lower case of an embodiment of the present invention;

fig. 3 is a second schematic view of a lower case according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a cell stack according to an embodiment of the present invention.

Description of reference numerals:

100-electric core stack, 200-first cooling plate, 400-second cooling plate, 500-third cooling plate;

300-lower box body, 310-containing cavity, 320-longitudinal beam, 330-cross beam, 340-side frame beam, 350-rear frame beam, 360-lower box body front end and 370-lower box body rear end.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1, an exploded schematic view of a battery assembly according to an embodiment of the present invention is shown. The embodiment of the utility model provides an in battery assembly including core stack 100, first cooling plate 200 and lower box 300, core stack 100 comprises a plurality of cylinder electric cores, and first cooling plate 200 is located core stack 100 top, and with the cylinder electric core rigid connection in the core stack 100, like the utmost point post rigid connection of the cylinder electric core in first cooling plate 200 and the core stack 100 to promote core stack 100 overall structure rigidity. The lower case 300 is provided with a plurality of accommodating cavities 310, and the plurality of cell stacks 100 are respectively accommodated in the accommodating cavities 310 of the lower case 300.

The embodiment of the utility model provides an in, the electric core that comprises a plurality of cylinder electricity core is piled 100 and is directly held in the chamber 310 that holds of lower box 300, has saved curb plate structure, end plate structure in the traditional module, has improved space utilization and energy density in the battery assembly.

In addition, the first cooling plate 200 is disposed above the electric core stack 100 and rigidly connected to the cylindrical electric core in the electric core stack 100, on one hand, the cylindrical electric core and the upper connecting piece of the electric core stack 100 are cooled by the first cooling plate 200, so that damage to the battery assembly due to heat released by charging and discharging of the battery assembly can be avoided, for example, under working conditions such as overcharge of the battery 4C, the temperature of the electric core pole and the upper connecting piece (such as an aluminum bar, a Flexible Printed Circuit (FPC), a nickel plate, etc.) of the electric core stack 100 is higher, and the upper part and peripheral structures of the electric core are cooled by adding the first cooling plate 200, so that the use safety and the service life of the battery assembly are improved; on the other hand, the first cooling plate 200 is rigidly connected to the cylindrical cells in the cell stack 100, so that the overall structural rigidity of the cell stack 100 is improved, and the mechanical performance and the anti-vibration capability of the battery assembly are improved.

In an embodiment of the present invention, the first cooling plate 200 can adopt an integrated brazing plate scheme or a split brazing plate scheme, and the first cooling plate 200 and the cylindrical battery cell in the battery cell stack 100 are rigidly connected through the heat conducting structure glue, so as to realize the heat transfer of the first cooling plate 200 and the battery cell stack 100.

The utility model discloses an in the example, the lower box can adopt section bar, cast aluminium's mode to realize, also can adopt panel beating tailor-welding, combined material or cast aluminium's mode to realize, the utility model discloses do not limit to this.

Referring to fig. 2, one of the schematic views of a lower case of an embodiment of the present invention is shown. The lower box 300 comprises side frame beams 340, longitudinal beams 320 and cross beams 330, and the plurality of accommodating cavities 310 are formed by the combination of the longitudinal beams 320, the cross beams 330 and the side frame beams 340. As an example, based on the vehicle width of 1600mm to 1800mm, the battery width can be determined to be 1450mm to 1550mm in consideration of collision clearance, threshold beams and the like, and profile cross beams 330 with the width of 30mm to 35mm are respectively arranged at the front and the back to ensure the safety of vehicle side collision; based on the whole vehicle wheel base being 2500mm to 2700mm, battery assembly length size is 2100mm to 2200mm between, and two width are section bar longerons 320 between 20mm to 35mm to inside arrangement to promote performance index such as battery assembly mode, intensity. So that three grid-shaped accommodating cavities 310 are formed inside the battery assembly to place the electric core stacks 100, and then the three electric core stacks 100 are integrated by adopting cylindrical electric cores with the diameters of 40-50 mm and the heights of 80-100 mm and are placed in the three accommodating cavities 310 of the lower box 300.

Referring to fig. 3, a second schematic diagram of a lower case of the embodiment of the present invention is shown. The battery assembly further includes a second cooling plate 400 and a third cooling plate 500 (refer to fig. 4). The second cooling plate 400 is disposed at the bottom of the lower case 300, and is used to replace the bottom plate of the lower case 300, and the second cooling plate 400 is rigidly connected to the cylindrical cells in the cell stack 100, so as to fix the cell stack 100 in the accommodating cavity 310 of the lower case 300. As an example, the second cooling plate 400 may adopt an integrated brazing plate scheme or a split brazing plate scheme, the thickness may be between 5mm and 8mm, the second cooling plate 400 and the frame and the cross beam 330 of the profile of the lower case 300 may be connected by using an FDS (Flow Drill screen, spin tapping and riveting) process, sealed by using a sealant, and fixedly connected to the cylindrical cells in the cell stack 100 and the second cooling plate 400 by using a heat conducting structure glue, so as to achieve heat transfer between the second cooling plate 400 and the cylindrical cells in the cell stack 100.

The third cooling plate 500 is located between the cylindrical cells, and the third cooling plate 500 is perpendicular to the first cooling plate and the second cooling plate. As an example, the third cooling plate 500 may have a serpentine shape, and is located between two adjacent rows of cylindrical battery cores to be matched with the side radian of the cylindrical battery cores, and the cylindrical battery cores are connected with the third cooling plate 500 by gluing so as to cool the cylindrical battery cores through the third cooling plate.

In the embodiment of the present invention, because in the process of charging and discharging the battery, the temperature of the battery is too high due to heat release, the battery capacity is attenuated, and the risk of thermal runaway is increased, so that the cylindrical battery core in the battery core stack 100 and the upper connecting member (such as aluminum bar, flexible connecting plate (FPC), nickel plate, etc.) of the battery core stack 100 can be cooled by the first cooling plate 200 disposed above the battery core stack 100, the second cooling plate 400 disposed below the battery core stack 100, and the third cooling plate 500 disposed between the cylindrical battery cores, thereby avoiding the damage of the battery due to too high temperature, and improving the safety and service life of the battery assembly; in addition, when the ambient temperature is too low, the battery capacity and performance are attenuated, and if the battery is charged at this time, the risk of thermal runaway (for example, the risk of thermal runaway caused by internal short circuit due to lithium separation) is increased, so that the cylindrical battery core can be preheated by the first cooling plate 200, the second cooling plate 400 and the third cooling plate 500, so as to reduce the risk caused by thermal runaway; and, the first cooling plate 200 and the second cooling plate 400 are respectively and rigidly connected with the cylindrical cells in the cell stack 100, so that the overall structural rigidity of the cell stack 100 and the overall structural rigidity of the battery assembly are improved, and the mechanical performance and the anti-vibration capability of the cell stack 100 and the battery assembly are improved.

In an embodiment of the present invention, the battery assembly further includes a cellular board, and the cellular board is disposed below the second cooling plate 400 and used as a protection bottom plate of the battery assembly. As an example, the bottom of the battery assembly adopts a honeycomb plate with the thickness of 5mm to 10mm to serve as a bottom protection plate of the battery assembly, so that the bottom of the battery is protected from impact, the safety of the battery is improved, and the advantage of light weight is obvious compared with a common steel plate protection scheme. It should be noted that the protection bottom plate may be made of other metal or alloy plate besides the honeycomb plate, for example, a steel plate, which is not limited by the present invention.

The utility model discloses an in the embodiment, the Battery assembly still includes BDU (Battery Disconnect Unit, battery package outage Unit) -BMS (Battery Management System), main control collection module, DCDC (DC-to-DC converter, direct current-direct current converter) -OBC (On-board Charger) collection module, intelligent fuse drive plate and a plurality of distributing type follow accuse collection module.

The BMS is a system for managing the battery, and generally has a function of measuring a voltage of the battery to prevent or avoid abnormal situations such as overdischarge, overcharge, and over-temperature of the battery; the BDU is also called a battery power distribution unit, a high-voltage device is integrated in the BDU, the BDU comprises a pre-charging loop and a charging and discharging loop, has the functions of current detection, voltage detection and the like, is used for controlling the on-off of a power battery loop and plays the roles of system overload and short-circuit protection; DCDC is an electrical energy conversion circuit or an electromechanical device that can convert a Direct Current (DC) power source into a direct current (or nearly direct current) power source of different voltages, and the power range can be from very small (small battery) to very large (high voltage power conversion); the OBC is a charger fixedly arranged on the electric automobile and has the capability of safely and automatically charging the power battery of the electric automobile, and the charger can dynamically adjust charging current or voltage parameters according to data provided by the BMS, execute corresponding actions and complete the charging process; the intelligent fuse driver board is used for fusing according to the acquired battery state so as to disconnect the internal connection of the battery assembly; and the slave control acquisition module is used for acquiring voltage, current and temperature data of each cylindrical battery cell and transmitting the data to the BDU-BMS master control integrated module.

Specifically, the BDU-BMS main control integrated module, the DCDC-OBC integrated module, and the intelligent fuse driving board are located between the back frame beam 350 of the lower case 300 and the receiving cavity 310, and the plurality of distributed slave control acquisition modules are located below the BDU-BMS main control integrated module, the DCDC-OBC integrated module, and the intelligent fuse driving board. The electric core stack 100 is located at the bottommost part of the battery assembly, and the heights of the BDU-BMS master control integrated module, the DCDC-OBC integrated module, the intelligent fuse drive plate and the slave control acquisition module are all larger than the height of the position of the electric core stack 100, so that when the cylindrical electric core is out of thermal control, leaked substances are prevented from being soaked in the BDU-BMS master control integrated module, the DCDC-OBC integrated module, the intelligent fuse drive plate and the slave control acquisition module, and the battery assembly is damaged greatly.

The embodiment of the utility model provides an in, with BMS, the two unifications of BDU, DCDC, OBC two unifications are integrated respectively to same module and are connected with the battery assembly, compare in BMS, BDU, DCDC and OBC dispersed arrangement, and it is more convenient to manage the battery assembly, can also simplify the line connection simultaneously, reduces the use of pencil, improves space utilization, has higher integrated nature, reduce cost.

It should be noted that, the utility model discloses well BDU can be integrated, perhaps partially integrated with BMS, DCDC, OBC and intelligent fuse drive plate, specifically can set up according to actual need, the utility model discloses do not limit to this.

The utility model discloses an in one embodiment, the battery assembly still includes the box, goes up the box and is equipped with the maintenance flap that corresponds with the position that BDU-BMS collection moulding piece and DCDC-OBC collection moulding piece were located, when there is the trouble in BDU-BMS collection moulding piece and DCDC-OBC collection moulding piece, can maintain BDU-BMS collection moulding piece and DCDC-OBC collection moulding piece through opening the maintenance flap.

The utility model discloses an in the example, go up the box and can adopt panel beating punching press scheme to form, also can punch other schemes and form, the utility model discloses do not limit to this.

The utility model discloses an in the embodiment, be equipped with the sealing strip between maintenance flap and the last box and between last box and the lower box 300 to guarantee the leakproofness of battery assembly through the sealing strip.

The utility model discloses an in the embodiment, the front end 360 of lower box is equipped with forerunner's high-pressure interface and maintenance switch, and the rear end 370 of lower box is equipped with rear-guard high-pressure interface, whole car communication interface and fills the interface soon.

The embodiment of the utility model provides a vehicle is still provided, including aforementioned battery assembly. The battery assembly includes: the battery cell stack consists of a plurality of cylindrical battery cells; the first cooling plate is arranged above the cell stack and is rigidly connected with the cylindrical cells in the cell stack; the lower box body is provided with a plurality of accommodating cavities for accommodating the electric core stacks.

In an embodiment of the present invention, the lower box body includes a side frame beam, a longitudinal beam, and a cross beam; the plurality of accommodating cavities are formed by combining the longitudinal beams, the cross beams and the side frame beams.

The utility model discloses an embodiment, still include: the second cooling plate is arranged at the bottom of the lower box body and used as a bottom plate of the lower box body; when the cell stack is accommodated in the accommodating cavity, the second cooling plate is rigidly connected with the cylindrical cells in the cell stack; a third cooling plate located between the cylindrical cells, the third cooling plate being perpendicular to the first cooling plate and the second cooling plate.

In an embodiment of the present invention, the first cooling plate and the second cooling plate are connected to the cylindrical battery cell in the battery cell stack through a heat-conducting adhesive, and the third cooling plate is connected to the cylindrical battery cell through an adhesive.

In one embodiment of the utility model, the intelligent fuse protector also comprises a BDU-BMS main control integrated module, a DCDC-OBC integrated module, an intelligent fuse driver board and a slave control acquisition module; the BDU-BMS main control integrated module, the DCDC-OBC integrated module and the intelligent fuse drive board are positioned between the rear frame beam and the accommodating cavity, and the slave control acquisition module is positioned below the BDU-BMS main control integrated module, the DCDC-OBC integrated module and the intelligent fuse drive board; wherein the height of the position of the slave control acquisition module is greater than that of the electric core stack.

The utility model discloses an in the embodiment, still include the upper box body, the upper box body be equipped with BDU-BMS collection moulding piece with the maintenance flap that the position that DCDC-OBC collection moulding piece was located corresponds.

The utility model discloses an embodiment, the maintenance flap with go up between the box with go up the box with be equipped with the sealing strip down between the box.

In an embodiment of the present invention, the battery module further includes a honeycomb plate disposed below the second cooling plate, and the honeycomb plate is used as the protection bottom plate of the battery assembly.

The utility model relates to an embodiment, the front end of box is equipped with forerunner's high-pressure interface and maintenance switch down, the rear end of box is equipped with rear-guard high-pressure interface, whole car communication interface and fills the interface soon down.

The above detailed description is made on the battery assembly and the vehicle provided by the present invention, and the specific examples are applied herein to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be changes in the specific embodiments and the application range, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A battery assembly, comprising:

the battery cell stack consists of a plurality of cylindrical battery cells;

the lower box body is provided with a plurality of accommodating cavities for accommodating the electric core stacks;

the second cooling plate is arranged at the bottom of the lower box body and used as a bottom plate of the lower box body; when the cell stack is accommodated in the accommodating cavity, the second cooling plate is rigidly connected to the cylindrical cells in the cell stack.

2. The battery assembly of claim 1, wherein the lower box includes side frame beams, longitudinal beams, and cross beams; and the plurality of accommodating cavities are formed by combining the longitudinal beams, the transverse beams and the side frame beams.

3. The battery assembly of claim 1, further comprising:

a third cooling plate located between the cylindrical cells, the third cooling plate being perpendicular to the first cooling plate and the second cooling plate.

4. The battery assembly of claim 3, wherein the first cooling plate and the second cooling plate are coupled to the cylindrical cells in the cell stack by a thermally conductive adhesive, and the third cooling plate is coupled to the cylindrical cells by an adhesive.

5. The battery assembly of claim 1, further comprising a BDU-BMS master control integrated module, a DCDC-OBC integrated module, an intelligent fuse driver board, and a slave acquisition module, wherein the lower case further comprises a back frame beam;

the BDU-BMS master control integrated module, the DCDC-OBC integrated module and the intelligent fuse drive board are positioned between the back frame beam and the accommodating cavity, and the slave control acquisition module is positioned below the BDU-BMS master control integrated module, the DCDC-OBC integrated module and the intelligent fuse drive board; wherein the slave control acquisition module is located at a position with a height larger than that of the electric core stack.

6. The battery assembly of claim 5, further comprising an upper case provided with a service flap corresponding to a position where the BDU-BMS integrated module and the DCDC-OBC integrated module are located.

7. The battery assembly of claim 6, wherein sealing strips are disposed between the service flap and the upper box and between the upper box and the lower box.

8. The battery assembly of claim 1, further comprising a honeycomb panel disposed below the second cooling panel, the honeycomb panel configured to act as a protective floor for the battery assembly.

9. The battery assembly according to claim 1, wherein the front end of the lower box body is provided with a front-drive high-voltage interface and a maintenance switch, and the rear end of the lower box body is provided with a rear-drive high-voltage interface, a whole vehicle communication interface and a quick charging interface.

10. A vehicle characterized by comprising the battery assembly of any one of claims 1 to 9.