CN211017317U - Battery box - Google Patents

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

a battery box

technical field

The utility model relates to the technical field of lithium battery thermal management, in particular to a battery box.

Background technique

With the consumption of traditional energy and environmental pollution, the country has paid more and more attention to the development of new energy in recent years, especially the rapid development of electric vehicles. The power output of an electric vehicle is a lithium-ion power battery, but the battery life, life and safety of an electric vehicle can only be guaranteed within a suitable temperature range. Therefore, the power battery system needs to be equipped with a corresponding thermal management system, which can not only help lithium-ion power The battery dissipates heat at high temperature, and can also assist the low temperature heating of the lithium-ion power battery. In the traditional thermal management of battery vehicles, the liquid-cooling plate assembly and the box are assembled separately, that is, the liquid-cooling plate assembly is bolted to the bottom of the box, which not only increases the complexity of the box, but also reduces the assembly efficiency. , but also increased the size and weight of the box. More importantly, with the cancellation of the subsidy policy and the increasing requirements for the energy density of the battery pack, the market urgently needs to lighten the structure of the battery pack. To sum up, the current requirements for battery life, safety and cost of lithium-ion battery packs for electric vehicles are getting higher and higher. It is necessary to improve the battery life requirements from the aspects of structural lightweight design and thermal management system regulation.

At present, the mainstream battery pack thermal management system is mainly composed of liquid-cooling plate components, pipelines, main inlet and main outlet nozzles, etc. The liquid-cooling plate components are assembled separately from the box, and the liquid-cooling plate components are bolted and fixed. On the bottom plate of the box, the bottom of the battery module is in close contact with the liquid cooling plate assembly, and thermally conductive materials are usually filled between the two for better heat transfer. The cooling medium flows in the liquid-cooling plate assembly to cool the module, so as to take away the excess heat of the module and ensure the working temperature of the battery. The liquid-cooling plate components are connected by pipelines, which can be used in series and parallel according to the actual application. In the traditional way, there are many assembly processes, the structure is relatively complex, and the separate assembly of the box body and the liquid cold plate assembly reduces the energy density of the entire battery pack, and also increases the risk of failure during the vibration process.

Utility model content

The purpose of the present invention is to provide an improved battery box in view of the problems in the prior art.

In order to achieve the above object, the technical scheme adopted by the present utility model is:

A battery box includes a box body and a cold plate assembly, the cold plate assembly forming the bottom of the box body, the cold plate assembly having a first cavity and a second cavity, the first cavity is located in the Above the second cavity, and the first cavity and the second cavity are not connected to each other, the first cavity is provided with a flow channel for the circulation of the cooling medium, and the second cavity Filled with insulating material.

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

Further, the water inlet and the water outlet are respectively located at both ends of the cold plate assembly in the longitudinal 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 at one side of the water inlet. It is located on one side of the water outlet in the box body.

Further, there are a plurality of the cold plate assemblies, the plurality of the cold plate assemblies are sequentially arranged along the lengthwise extending direction of the box body, and the plurality of the cold plate assemblies are arranged in parallel, and each of the cold plate assemblies is arranged in parallel. The water inlets on the assembly are respectively communicated with the water inlet pipes, and the water outlets on each of the cold plate assemblies are respectively communicated with the water outlet pipes.

Further, the box body includes a bottom beam located at the bottom of the box body, the bottom beam is provided with a plurality of, and the two ends of the cold plate assembly in the width direction are respectively welded with the bottom beam by friction stir welding. connect.

Further, a support portion is provided on the bottom beam, and the cold plate assembly is partially built on the support portion, and the joint surface of the cold plate assembly and the support portion is connected by friction stir welding. .

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

Further, both ends of the cold plate assembly in the longitudinal direction are respectively connected with the side beams on both sides by friction stir welding.

Further, the side beams on each side are provided with a convex portion, the cold plate assembly is provided with a concave portion matched with the convex portion, and the concave portion is located in the first cavity on the cold plate assembly At the transition position between the body and the second cavity, the convex portion is clamped into the concave portion, and the joint surfaces of the convex portion and the concave portion are connected by friction stir welding.

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

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the battery box of the present invention has a simple structure, and the cold plate assembly and the box body are integrated together, which greatly reduces the weight of the entire battery box, and can The energy density of the battery box is effectively improved. The cold plate assembly has two cavities arranged side by side. The upper cavity can circulate the cooling medium to cool the module and dissipate heat. The lower cavity can be filled with heat insulation. Insulation material, thereby improving the cooling effect of the module.

Description of drawings

Accompanying drawing 1 is the structural schematic diagram of the battery box of the present invention;

Accompanying drawing 2 is the structural representation of the first beam of the present utility model;

Accompanying drawing 3 is the structural representation of the second beam of the present utility model;

Accompanying drawing 4 is the structural representation of the side beam of the present utility model;

Accompanying drawing 5 is the structural representation of the bottom beam of the present utility model;

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

Accompanying drawing 7 is the front view of accompanying drawing 6;

Accompanying drawing 8 is the top view of accompanying drawing 6;

Accompanying drawing 9 is the partial enlarged view of A place in accompanying drawing 8;

Figure 10 is a side view of Figure 6 (with the plug removed);

FIG. 11 is a schematic structural diagram of the pipeline system of the present invention.

Detailed ways

The technical solutions of the present utility model will be further elaborated below in conjunction with the accompanying drawings.

As shown in FIG. 1 , the battery box of the present invention includes a box body and a cold plate assembly 1 , 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 includes side beams 21 and transverse beams. The side beams 21 extend along the length direction of the box body, and the transverse beams extend along the width direction of the box body. The side beams 21 are respectively arranged on opposite sides in the width direction of the box body. Opposite sides in the length direction of the box. The side beams 21 and the beams are made of aluminum alloy profiles, and the adjacent ends of each adjacent side beam 21 and the beam are connected by friction stir welding.

The box body also includes a bottom beam 23 at the bottom of the box body, and the bottom beam 23 is used for fixing the module. The bottom beams 23 are provided in multiple groups, and the plurality of bottom beams 23 are arranged at intervals along the longitudinal extension direction of the box body. The bottom beams 23 are also made of aluminum alloy profiles, and both ends of each bottom beam 23 in the longitudinal direction are respectively connected with the side beams 21 on the corresponding side by friction stir welding.

As shown in FIGS. 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 , namely the first cavity 111 . 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 connected to each other. The first cavity 111 is provided with a flow channel for the cooling medium to circulate. The module is placed on the cold plate assembly 1 and located above the first cavity 111 , and the module is cooled by the cooling medium in the first cavity 111 , the second cavity 112 is filled with insulating material to ensure that the cold plate assembly 1 has higher cooling efficiency.

On the one hand, the cold plate assembly 1 serves as a profile at the bottom of the box to support the weight of the module, and on the other hand, the cold plate assembly 1 is used to cool the bottom of the module. 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.

There are multiple flow channels in the first cavity 111 , and the multiple flow channels can be arranged in parallel, or in series, or in a mixture of series and parallel. 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 flow uniformly through the first cavity 111, and the module can be effectively cooled by heat exchange.

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 , and the length extending direction of each reinforcing rib 12 is perpendicular to the length extending direction of the box body. , the interval between two adjacent reinforcing ribs 12 and the interval between the side wall of the cold plate assembly 1 and the adjacent one of the reinforcing ribs 12 all form a flow channel for the cooling medium to flow.

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

A plurality of cold plate assemblies 1 are provided, the plurality of cold plate assemblies 1 are arranged in sequence along the longitudinal extension direction of the box, and the plurality of cold plate assemblies 1 are arranged in parallel.

A plurality of bottom beams 23 are provided, the two ends of the cold plate assembly 1 in the width direction are respectively connected with the bottom beam 23 by friction stir welding, and the two ends in the length direction of the cold plate assembly 1 pass through the side beams 21 respectively. Friction stir welding welded connections.

As shown in FIG. 5 , the bottom beam 23 includes a connecting portion 231 and a supporting portion 232 . The connecting portion 231 is used to support and connect the module. The cold plate assembly 1 is partially built on the supporting portion 232 , and the cold plate assembly 1 and the supporting portion 232 The joint surfaces are connected by friction stir welding.

As shown in FIG. 4 , each side beam 21 is provided with a convex portion 211 , and the cold plate assembly 1 is provided with a concave portion 16 matching with the convex portion 211 , and the concave portion 16 is located in the first cavity on the cold plate assembly 1 . At the transition position between 111 and the second cavity 112 , 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 connected by friction stir welding.

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

The battery box also includes a pipeline system arranged in the box. As shown in FIG. 1 and FIG. 11 , the pipeline system includes a water inlet pipe 31 and a water outlet pipe 32 , and each cold plate assembly 1 is respectively provided with a water inlet 14 and an outlet. The water inlet 15 and the water inlet pipe 31 are provided with a plurality of water inlet joints 33, and each water inlet joint 33 is respectively communicated with the water inlet 14 on each cold plate assembly 1, and the water outlet pipe 32 is provided with a plurality of water outlet joints 34, each water outlet joint 34 respectively communicate 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 both ends of the cold plate assembly 1 in the length direction, the water inlet 14 on each cold plate assembly 1 is located on the same side of the box, and each cold plate assembly 1 is located on the same side of the box. The water outlet 15 is also located on the same side of the box body, the water inlet pipe 31 is located on the side of the water inlet 14 in the box body, and the water outlet pipe 32 is located on the side of the water outlet 15 in the box body.

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

After the welding is completed, each joint can be welded again using fusion welding technology to further improve its sealing and strength properties.

The working principle of the battery box is as follows:

The module is installed on the bottom beam 33 and the cold plate assembly 1, the cooling medium flows into the water inlet pipe 31 from the water inlet nozzle 33 on the first beam 1 and flows in the water inlet pipe 31, and then the cooling medium is respectively arranged on each cold plate. The water inlet 14 on the module 1 flows into the first cavity 111 and flows along a plurality of flow channels arranged in parallel in each first cavity 111. When the cooling medium flows in the flow channels, it cools the bottom of the module, and then the cooling medium passes through each flow channel. The water outlet 15 flows out of the cold plate assembly 1 , enters the water outlet pipe 32 , and finally flows out of the water outlet pipe 32 from the water outlet nozzle 34 on the first beam 1 .

In summary, the battery box integrates the cold plate assembly and the box body, which can avoid damage caused by vibration or shock between the traditional cold plate assembly and the box body; the cold plate assembly adopts a double-layer structure design , which not only ensures the sufficient heat exchange of the module, but also greatly reduces the weight of the battery box, thereby improving the energy density of the battery box and increasing the cruising range; moreover, the cold plate assembly adopts a double-layer structure design to achieve thermal insulation, This effectively improves the cooling efficiency; finally, the battery box is made of aluminum alloy profiles that are connected by friction stir welding, and the cold plate assembly can fully bear the weight of the module, with high structural strength and high safety.

The above-described embodiments are only for illustrating the technical concept and characteristics of the present utility model, and its purpose is to allow those who are familiar with the technology to understand the content of the present utility model and implement it, and cannot limit the scope of protection of the present utility model with this. Equivalent changes or modifications made in the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A battery box, comprising a box body and a cold plate assembly, the cold plate assembly forming the bottom of the box body, characterized in that: the cold plate assembly has a first cavity and a second cavity, the The first cavity is located above the second cavity, and the first cavity and the second cavity are not communicated with each other, and the first cavity is provided with a flow channel for the circulation of the cooling medium, The second cavity is filled with heat insulating material. 2 . The battery box according to claim 1 , wherein the battery box further comprises a pipeline system arranged in the box, the pipeline system comprises a water inlet pipe and a water outlet pipe, and the cold plate assembly A water inlet and a water outlet are respectively provided on the upper part, 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 , wherein the water inlet and the water outlet are respectively located at both ends of the cold plate assembly in the length direction, and the water inlet pipe is located in the box body. 4 . The water outlet pipe is located on the side of the water inlet, and the water outlet pipe is located on the side of the water outlet in the box. 4 . The battery box according to claim 2 , wherein a plurality of the cold plate assemblies are provided, and the plurality of the cold plate assemblies are arranged in sequence along the lengthwise extending direction of the box body, and a plurality of the cold plate assemblies are arranged in sequence. The plate assemblies are arranged in parallel, the water inlets on each of the cold plate assemblies are respectively communicated with the water inlet pipes, and the water outlets on each of the cold plate assemblies are respectively communicated with the water outlet pipes. 5 . The battery box according to claim 4 , wherein the box body comprises a bottom beam located at the bottom of the box body, the bottom beam is provided with a plurality of bottom beams, and the two bottom beams in the width direction of the cold plate assembly are 5 . The ends are respectively connected with the bottom beam by friction stir welding. 6 . The battery box according to claim 5 , wherein a support portion is provided on the bottom beam, the cold plate assembly is partially erected on the support portion, and the cold plate assembly is connected to the support. 7 . The joint surfaces of the parts are connected by friction stir welding. 7 . The battery box according to claim 1 , wherein the box body further comprises side beams located on both sides in the width direction of the box body and two sides located in the length direction of the box body. 8 . The beams, the adjacent side beams and the adjacent ends of the beams are connected by friction stir welding. 8 . The battery box according to claim 7 , wherein both ends of the cold plate assembly in the longitudinal direction are respectively connected to the side beams on both sides by friction stir welding. 9 . 9 . The battery box according to claim 8 , wherein a convex portion is provided on the side beam on each side, the cold plate assembly is provided with a concave portion matched with the convex portion, and the concave portion is located in the The cold plate assembly is located at the transition position between the first cavity and the second cavity, the convex part is clamped into the concave part, and the joint surface between the convex part and the concave part passes through Friction stir welding welded connections. 10 . The battery box according to claim 1 , wherein the cold plate assembly further comprises plugs respectively disposed at both ends of the first cavity in the longitudinal direction. 11 .

Images