CN211017317U

CN211017317U - Battery box

Info

Publication number: CN211017317U
Application number: CN201921880118.2U
Authority: CN
Inventors: 吴中旺; 时红海; 刘畅; 胡剑锋; 李继伟
Original assignee: Suzhou Automotive Research Institute of Tsinghua University
Current assignee: Suzhou Automotive Research Institute of Tsinghua University; Nanjing Golden Dragon Bus Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-07-14
Anticipated expiration: 2029-11-04

Abstract

The utility model discloses a battery box, including box and cold drawing subassembly, the cold drawing subassembly forms the bottom of box, the cold drawing subassembly has first cavity and second cavity, first cavity is located the top of second cavity, just first cavity with each other do not communicate between the second cavity, be provided with the runner that supplies the coolant circulation in the first cavity, it has thermal insulation material to fill in the second cavity. This battery box simple structure, cold drawing subassembly and box integration set up together, greatly reduced the weight of whole battery box, can effectual improvement battery box's energy density, two cavitys that the cold drawing subassembly set up side by side from top to bottom, can supply the coolant circulation in the cavity on upper strata to cool off the module, can fill thermal-insulated insulation material in the cavity of lower floor, thereby improve the cooling effect of module.

Description

Battery box

Technical Field

The utility model relates to a lithium cell heat management technical field, concretely relates to battery box.

Background

With the consumption of traditional energy sources and the pollution to the environment and other reasons, in recent years, the development of new energy sources is more and more emphasized in China, and particularly, the development of electric automobiles is rapid. The power output of the electric automobile is a lithium ion power battery, but the endurance, the service life and the safety of the electric automobile can be ensured only in a proper temperature range, so that a power battery system needs to be provided with a corresponding thermal management system, and the lithium ion power battery can be assisted in high-temperature heat dissipation and low-temperature heating. In the traditional battery car heat management, the liquid cooling plate assembly and the box body are separately assembled, namely, the liquid cooling plate assembly is fixed on a bottom plate of the box body through bolts, so that the complexity of the box body is increased, the assembly efficiency is reduced, and the size and the weight of the box body are increased. More importantly, with the cancellation of subsidy policies and the increasing requirements on the energy density of the battery pack, the market urgently needs to lighten the structure of the battery pack. In summary, currently, requirements for endurance, safety and cost of the lithium ion battery pack of the electric vehicle are higher and higher, and the endurance requirement needs to be improved from the aspects of structural lightweight design, thermal management system regulation and control and the like.

At present mainstream battery package thermal management system mainly by liquid cooling board subassembly, pipeline, mainly advance main play to connect the mouth etc. to constitute, wherein liquid cooling board subassembly with the box separately assemble, liquid cooling board subassembly is fixed on the box bottom plate through bolted connection, then with battery module bottom and liquid cooling board subassembly tightly contact, in order better carrying out the heat transfer between the two simultaneously, can fill the heat conduction material usually. The cooling medium flows in the liquid cooling plate assembly to cool the module, so that excessive heat of the module is taken away, and the working range temperature of the battery is guaranteed. The liquid cooling plate assemblies are connected by pipelines, wherein the liquid cooling plate assemblies can be connected in series and in parallel according to practical application. The traditional mode has more assembling processes and relatively complex structure, the energy density of the whole battery pack is reduced due to the separation and assembly of the box body and the liquid cooling plate assembly, and meanwhile, the failure risk is increased in the vibration process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a problem among the prior art provides a modified battery box.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

the utility model provides a battery box, includes box and cold drawing subassembly, the cold drawing subassembly forms the bottom of box, the cold drawing subassembly has first cavity and second cavity, first cavity is located the top of second cavity, just first cavity with each other not communicate between the second cavity, be provided with the runner that supplies the coolant circulation in the first cavity, it has thermal insulation material to fill in the second cavity.

Preferably, the battery box further comprises a pipeline system arranged in the box body, the pipeline system comprises a water inlet pipe and a water outlet pipe, a water inlet and a water outlet are respectively arranged on the cold plate assembly, the water inlet pipe is communicated with the water inlet, and the water outlet pipe is communicated with the water outlet.

Furthermore, the water inlet and the water outlet are respectively located at two end portions of the cold plate assembly in the length direction, the water inlet pipe is located on one side of the water inlet in the box body, and the water outlet pipe is located on one side of the water outlet in the box body.

Furthermore, the cold plate assemblies are arranged in a plurality, the cold plate assemblies are sequentially arranged along the length extending direction of the box body, the cold plate assemblies are arranged in parallel, the water inlet on each cold plate assembly is communicated with the water inlet pipe, and the water outlet on each cold plate assembly is communicated with the water outlet pipe.

Further, the box is including being located the floorbar of bottom half, the floorbar is provided with a plurality ofly, both ends on the cold plate subassembly width direction respectively with the floorbar passes through friction stir welding welded connection.

Furthermore, the bottom beam is provided with a support part, the cold plate assembly is partially erected on the support part, and the joint surfaces of the cold plate assembly and the support part are welded and connected through friction stir welding.

Preferably, the box body further comprises side beams positioned on both sides in the width direction of the box body and cross beams positioned on both sides in the length direction of the box body, and adjacent ends of the adjacent side beams and the adjacent ends of the cross beams are welded by friction stir welding.

Furthermore, two end parts of the cold plate assembly in the length direction are respectively welded and connected with the side beams on two sides through friction stir welding.

Furthermore, a convex part is arranged on each side beam, a concave part matched with the convex part is arranged on the cold plate assembly, the concave part is positioned at the transition position of the first cavity and the second cavity on the cold plate assembly, the convex part is clamped into the concave part, and the joint surfaces of the convex part and the concave part are welded and connected through friction stir welding.

Preferably, the cold plate assembly further includes plugs respectively disposed at two ends of the first cavity in the length direction.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage: the utility model discloses a battery box simple structure, cold drawing subassembly and box integration set up together, greatly reduced the weight of whole battery box, can improve the energy density of battery box effectively, the cold drawing subassembly has two cavitys that set up side by side from top to bottom, can supply the cooling medium circulation in the cavity on upper strata to cool off the heat dissipation to the module, can fill thermal-insulated insulation material in the cavity of lower floor, thereby improve the cooling effect of module.

Drawings

Fig. 1 is a schematic structural diagram of a battery box of the present invention;

fig. 2 is a schematic structural view of a first cross beam of the present invention;

fig. 3 is a schematic structural view of a second cross beam of the present invention;

FIG. 4 is a schematic structural view of a side beam of the present invention;

FIG. 5 is a schematic structural view of the bottom beam of the present invention;

fig. 6 is a perspective view of the cold plate assembly of the present invention;

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a top view of FIG. 6;

FIG. 9 is an enlarged view of a portion of FIG. 8 at A;

FIG. 10 is a side view of FIG. 6 (with the bulkhead removed);

fig. 11 is a schematic structural diagram of the piping system of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

As shown in FIG. 1, the battery box of the present invention comprises a box body and a cold plate assembly 1, wherein the cold plate assembly 1 is integrated on the box body, and the cold plate assembly 1 forms the bottom of the box body.

The box body comprises side beams 21 and cross beams, wherein the side beams 21 extend along the length direction of the box body, the cross beams extend along the width direction of the box body, the side beams 21 are respectively arranged at two opposite sides of the width direction of the box body, and the cross beams are respectively arranged at two opposite sides of the length direction of the box body. The side beams 21 and the cross beams are made of aluminum alloy sections, and one end part of each adjacent side beam 21 and one end part of each adjacent cross beam are welded and connected through friction stir welding.

The box also comprises a bottom beam 23 positioned at the bottom of the box, and the bottom beam 23 is used for fixing the module. The bottom beams 23 are provided with a plurality of groups, and the bottom beams 23 are arranged at intervals along the length extending direction of the box body. The bottom beams 23 are also made of aluminum alloy sections, and both end portions in the longitudinal direction of each bottom beam 23 are respectively connected to the side beams 21 on the corresponding side by friction stir welding.

As shown in fig. 6 to 10, the cold plate assembly 1 includes a plate body 11, the plate body 11 has a first cavity 111 and a second cavity 112, the first cavity 111 is located above the second cavity 112, that is, the first cavity 111 faces the inside of the box body, the second cavity 112 faces the outside of the box body, and the first cavity 111 and the second cavity 112 are independent from each other and are not communicated with each other. Be provided with the runner that supplies the coolant circulation in the first cavity 111, the module is placed on cold drawing subassembly 1 and is located the top of first cavity 111, cools off the module through the coolant in first cavity 111, and it has thermal insulation material to fill in the second cavity 112, guarantees that cold drawing subassembly 1 has higher cooling efficiency.

The cold plate assembly 1 supports the weight of the module as a profile at the bottom of the tank on the one hand, and the cold plate assembly 1 is used to cool the bottom of the module on the other hand. The surface of the cold plate assembly 1 is the same size as the bottom surface of the module, which increases the heat exchange area.

The flow channels in the first cavity 111 are provided in plurality, and the flow channels can be arranged in parallel, in series or in a mixed manner. In this embodiment, a plurality of flow channels are arranged in parallel. After the cooling medium enters the first cavity 111, the cooling medium flows in each flow channel, so that the cooling medium can uniformly flow through the first cavity 111, and heat exchange and cooling can be effectively performed on the module.

Specifically, as shown in fig. 10, a plurality of reinforcing ribs 12 are arranged in parallel in the first cavity 111 of the cold plate assembly 1, the length extending direction of each reinforcing rib 12 is perpendicular to the length extending direction of the tank, and the space between two adjacent reinforcing ribs 12 and the space between the side wall of the cold plate assembly 1 and one adjacent reinforcing rib 12 form a flow channel for the cooling medium to flow.

The cold plate assembly 1 further includes plugs 13 respectively disposed at two ends of the first cavity 111 in the length direction, and the plugs 13 are welded to the plate body 11 by friction stir welding, so that the first cavity 111 forms a sealed cavity.

The cold drawing subassembly 1 is provided with a plurality ofly, and a plurality of cold drawing subassemblies 1 are arranged along the length extending direction of box in proper order, and parallelly connected setting between a plurality of cold drawing subassemblies 1.

The bottom beam 23 is provided with a plurality of, and the both ends on the width direction of cold drawing subassembly 1 pass through friction stir welding welded connection with the bottom beam 23 respectively, and the both ends on the length direction of cold drawing subassembly 1 pass through friction stir welding welded connection with curb girder 21 respectively.

As shown in fig. 5, the bottom beam 23 includes a connection portion 231 and a support portion 232, the connection portion 231 is used for supporting and connecting the module, the cold plate assembly 1 is partially erected on the support portion 232, and the joint surfaces of the cold plate assembly 1 and the support portion 232 are welded and connected by friction stir welding.

As shown in fig. 4, a convex portion 211 is provided on each side beam 21, a concave portion 16 matching with the convex portion 211 is provided on the cold plate assembly 1, the concave portion 16 is located at the transition position of the first cavity 111 and the second cavity 112 on the cold plate assembly 1, the convex portion 211 is clamped into the concave portion 16, and the joint surfaces of the convex portion 211 and the concave portion 16 are welded by friction stir welding.

The connection mode between the cold plate assembly 1 and the bottom beam 23 and the side beam 21 can improve the performances of sealing, strength and the like of welding.

The battery box further comprises a pipeline system arranged in the box body, as shown in fig. 1 and fig. 11, the pipeline system comprises a water inlet pipe 31 and a water outlet pipe 32, a water inlet 14 and a water outlet 15 are respectively arranged on each cold plate assembly 1, a plurality of water inlet connectors 33 are arranged on the water inlet pipe 31, each water inlet connector 33 is respectively communicated with the water inlet 14 on each cold plate assembly 1, a plurality of water outlet connectors 34 are arranged on the water outlet pipe 32, and each water outlet connector 34 is respectively communicated with the water outlet 15 on each cold plate assembly 1.

In this embodiment, the water inlet 14 and the water outlet 15 are respectively located at two end portions of the cold plate assembly 1 in the length direction, the water inlet 14 on each cold plate assembly 1 is located at the same side of the box body, the water outlet 15 on each cold plate assembly 1 is also located at the same side of the box body, the water inlet pipe 31 is located at one side of the water inlet 14 in the box body, and the water outlet pipe 32 is located at one side of the water outlet 15 in the box body.

As shown in fig. 1 to 3, the cross beam includes a first cross beam 1 and a second cross beam 2, the first cross beam 1 is respectively provided with a water inlet connector 35 and a water outlet connector 36, one end of the water inlet pipe 31 is connected to the water inlet connector 35, and one end of the water outlet pipe 32 is connected to the water outlet connector 36.

After welding, welding can be performed again at each joint by using a fusion welding technology so as to further improve the performances of sealing, strength and the like.

The working principle of the battery box is as follows:

the module is installed on floorbar 33 and cold drawing subassembly 1, cooling medium flows into inlet tube 31 and flows in inlet tube 31 from the water inlet connector 33 on first crossbeam 1, then cooling medium flows into first cavity 111 through setting up inlet 14 on each cold drawing subassembly 1 respectively, and flow along a plurality of runners of parallelly connected setting in each first cavity 111, the cooling medium cools off the module bottom when flowing in the runner, then cooling medium flows out cold drawing subassembly 1 through each delivery port 15, get into outlet pipe 32, go out outlet pipe 32 from outlet connector 34 on first crossbeam 1 at last.

In conclusion, the battery box integrates the cold plate assembly with the box body, so that the damage to the traditional cold plate assembly and the box body caused by vibration, impact and other factors can be avoided; the cold plate assembly adopts a double-layer structure design, so that the full heat exchange of the module is ensured, and the weight of the battery box is greatly reduced, thereby improving the energy density of the battery box and increasing the endurance mileage; moreover, the cold plate assembly adopts a double-layer structure design to realize heat preservation and heat insulation, so that the cooling efficiency is effectively improved; finally, this battery box is that the aluminum alloy ex-trusions adopts friction stir welding connection technology to connect, and the module weight can be born completely to the cold plate subassembly, and its structural strength is high, and the security is high.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A battery box, includes box and cold drawing subassembly, the cold drawing subassembly forms the bottom of box, its characterized in that: the cold plate assembly is provided with a first cavity and a second cavity, the first cavity is located above the second cavity, the first cavity and the second cavity are not communicated with each other, a flow channel for circulation of a cooling medium is arranged in the first cavity, and a heat insulating material is filled in the second cavity.

2. The battery box according to claim 1, characterized in that: the battery box further comprises a pipeline system arranged in the box body, the pipeline system comprises a water inlet pipe and a water outlet pipe, a water inlet and a water outlet are respectively formed in the cold plate assembly, the water inlet pipe is communicated with the water inlet, and the water outlet pipe is communicated with the water outlet.

3. The battery box according to claim 2, characterized in that: the water inlet and the water outlet are respectively positioned at two end parts of the cold plate component in the length direction, the water inlet pipe is positioned at one side of the water inlet in the box body, and the water outlet pipe is positioned at one side of the water outlet in the box body.

4. The battery box according to claim 2, characterized in that: the cold drawing subassembly is provided with a plurality ofly, and is a plurality of the cold drawing subassembly is followed the length extending direction of box arranges in order, and is a plurality of parallelly connected setting between the cold drawing subassembly, every on the cold drawing subassembly the water inlet respectively with the inlet tube intercommunication, every on the cold drawing subassembly the delivery port respectively with the outlet pipe intercommunication.

5. The battery box according to claim 4, characterized in that: the box is including being located the floorbar of bottom half, the floorbar is provided with a plurality ofly, the last both ends of cold plate subassembly width direction respectively with the floorbar passes through friction stir welding welded connection.

6. The battery box according to claim 5, characterized in that: the bottom beam is provided with a supporting part, the cold plate component is partially erected on the supporting part, and the cold plate component is connected with the joint surface of the supporting part through friction stir welding.

7. The battery box according to claim 1, characterized in that: the box body further comprises side beams positioned on two sides of the box body in the width direction and cross beams positioned on two sides of the box body in the length direction, and adjacent end parts of the side beams and the cross beams are connected through friction stir welding.

8. The battery box according to claim 7, characterized in that: and two end parts of the cold plate assembly in the length direction are respectively welded and connected with the side beams on two sides through friction stir welding.

9. The battery box according to claim 8, characterized in that: convex parts are arranged on the side beams on each side, concave parts matched with the convex parts are arranged on the cold plate assembly, the concave parts are positioned at the transition positions of the first cavity and the second cavity on the cold plate assembly, the convex parts are clamped into the concave parts, and the joint surfaces of the convex parts and the concave parts are welded and connected through friction stir welding.

10. The battery box according to claim 1, characterized in that: the cold plate component also comprises plugs which are respectively arranged at two end parts of the first cavity in the length direction.