CN211507722U

CN211507722U - Air cooling and heat pipe combined power battery heat management device

Info

Publication number: CN211507722U
Application number: CN202020277831.4U
Authority: CN
Inventors: 张淑宇; 迟彦超; 邢志斌; 陈保国; 彭月猛
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-09-15
Anticipated expiration: 2030-03-09

Abstract

The utility model provides a power battery thermal management device of forced air cooling and heat pipe combination, including setting up the heat exchanger in electric automobile air conditioning system and the battery module that communicates through pipeline and heat exchanger, the battery module includes the module shell and sets up a plurality of electric cores in the module shell, is provided with the heat pipe between the two adjacent electric cores, and it is cotton to be provided with the bubble with between the heat pipe that the module shell is adjacent and the module shell. Power battery heat management device with heat pipe and air-cooled radiating mode coupling, utilize the forced air cooling to bring out the heat of heat pipe, guarantee phase change material and remain throughout at the endothermic state, and then maintain the invariant of electric core temperature.

Description

Air cooling and heat pipe combined power battery heat management device

Technical Field

The utility model belongs to the power battery field especially relates to a power battery heat management device of forced air cooling and heat pipe combination.

Background

The key of the electric automobile is a power battery, the electrochemical performance and the cycle life of most batteries are obviously influenced by temperature, and the performance of the batteries is not favorably exerted when the temperature is too high or too low. The purpose of battery thermal management includes reducing the temperature of the battery through heat dissipation, reducing the temperature difference inside the battery, heating or heat preservation of the battery in a low-temperature environment, and meeting the requirements of light weight and compactness of the electric automobile so as to improve the energy density of the battery.

At present, the battery thermal management technology mainly comprises: air cooling, liquid cooling, phase change heat transfer material and the like. The mode of thermally managing the battery by air has the advantages of low cost, simple system structure, convenience in maintenance and the like, but with the improvement of the energy density of the battery, the thermal load of the battery is large, the relaxation time of the thermal conduction is long, the requirement cannot be met only by air cooling, and in addition, the sealing property of the battery box body cannot be guaranteed; the liquid cooling mode has the advantages of high cooling speed, high cooling efficiency and the like, but also has the defects of complex system structure, heavy mass, liquid leakage risk, difficult maintenance and the like; the phase-change material is small in size, the heat dissipation effect is more remarkable, the uniformity of the temperature inside the battery is better, the heat conduction performance of the phase-change material is poorer, the weight is heavier, and the energy density of the battery pack is reduced to a certain extent.

Disclosure of Invention

In view of this, the utility model aims at providing a power battery thermal management device of forced air cooling and heat pipe combination to overcome the problem that exists among the prior art, reduce the bulk temperature of battery operation in-process, and improve the homogeneity of the inside temperature of battery.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a power battery thermal management device of forced air cooling and heat pipe combination, is including setting up the heat exchanger in electric automobile air conditioning system and the battery module that communicates through pipeline and heat exchanger, the battery module includes the module shell and sets up a plurality of electric cores in the module shell, is provided with the heat pipe between two adjacent electric cores, and it is cotton to be provided with the bubble between heat pipe and the module shell adjacent with the module shell.

Further, be provided with air intake and air outlet on the module shell, the air intake intercommunication has the intake stack, and the air outlet intercommunication has the air-out pipeline, intake stack and air-out pipeline all communicate with the heat exchanger.

Further, a heat conduction layer is arranged between the heat pipe and the battery core.

Further, the top of the heat pipe is higher than the top of the battery core.

Further, a gap is arranged between the top of the heat pipe and the top of the module shell.

Further, the bottom in the module shell is provided with the heating film that is used for heating electric core and heat pipe.

Furthermore, four-way valves are arranged on the air inlet pipeline and the air outlet pipeline, and a fan and a one-way valve are further arranged on the air inlet pipeline.

Furthermore, a pipeline is connected between the four-way valve on the air inlet pipeline and the four-way valve on the air outlet pipeline.

Further, the heat conduction layer is a foam metal layer or a heat conduction adhesive layer.

Furthermore, the heat pipe is a gravity type heat pipe, and a gas-liquid phase change material is filled in the heat pipe.

Compared with the prior art, forced air cooling and power battery heat management device of heat pipe combination have following advantage:

(1) device with heat pipe and air-cooled radiating mode coupling, utilize the forced air cooling to bring out the heat of heat pipe, guarantee phase change material and remain throughout at the endothermic state, and then maintain the invariant of electric core temperature.

(2) The device in be equipped with the switching-over valve in the pipeline that links to each other with air intake and air outlet to change the flow direction of air.

(3) Device well module shell bottom set up the heating film, to electric core and heat pipe concurrent heating, the heat pipe temperature rises to the heating of electricity core after a definite value, guarantees electric core temperature's homogeneity, hot-air gets into from the air intake simultaneously, heats from upper portion, guarantees better heating effect.

Drawings

Fig. 1 is a schematic view of an internal structure of a battery module;

FIG. 2 is a schematic diagram of a first working mode of the power battery heat management device with combination of air cooling and heat pipes;

fig. 3 is a schematic diagram of a second working mode of the power battery thermal management device combining air cooling and a heat pipe.

Reference numerals:

1-top cover; 2-side plate; 3, soaking cotton; 4, a heat pipe; 5, an electric core; 6, an air inlet; 7, an air outlet; 8-heating the film; 9-a heat exchanger; 10-one-way valve; 11-a fan; 12-a battery module; 13. 14-a four-way valve; 15. 16, 17, 18, 19, 20, 21, 22-pipes.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

The power battery thermal management device combining air cooling and heat pipes shown in fig. 1-3 comprises a heat exchanger 9 arranged in an air conditioning system of an electric automobile and a battery module communicated with the heat exchanger 9 through a pipeline. The battery module includes module shell and sets up a plurality of electric cores 5 in the module shell.

Specifically, the module shell is provided with an air inlet 6 and an air outlet 7, the air inlet 6 is communicated with an air inlet pipeline, the air outlet 7 is communicated with an air outlet pipeline, and the air inlet pipeline and the air outlet pipeline are both communicated with the heat exchanger 9.

A heat pipe 4 is arranged between two adjacent electric cores, specifically, the heat pipe 4 is a gravity type heat pipe, and a gas-liquid phase change material is filled in the heat pipe.

As preferred scheme, in order to realize the heat preservation of battery module, prevent that the module from carrying out heat exchange with the outside, be provided with the bubble cotton 3 between heat pipe 4 adjacent with the module shell and the module shell, bubble cotton 3 sets up between the curb plate 2 of module shell and the heat pipe in the outside promptly.

Preferably, a heat conducting layer (not shown) is disposed between the heat pipe 4 and the battery cell 5. Such as: a foam metal layer or a heat conducting adhesive layer, in order to reduce the thermal resistance between the cell and the heat pipe.

As a preferred scheme, the top of the heat pipe 4 is higher than the top of the battery cell 5, so that the heat exchange area with air is increased, and the heat exchange effect is improved;

preferably, a gap is provided between the top of the heat pipe 4 and the top cover 1 of the module housing. So that the air circulation is facilitated and the heat dissipation is performed on the inside of the battery.

Preferably, the bottom of the module housing is provided with a heating film 8.

Four-

way valves

13 and 14 are arranged on the air inlet pipeline and the air outlet pipeline, and a fan 11 and a one-way valve 10 are also arranged on the air inlet pipeline. A pipeline is connected between the four-

way valves

13 and 14 on the air inlet pipeline and the air outlet pipeline.

For the real-time control who realizes electric core temperature, the utility model discloses a device still includes the controller, is provided with the temperature sensor who is connected with the controller simultaneously on electric core, transmits the temperature signal of electric core for the controller through wired or wireless mode in real time. The controller also controls the four-way valve, the one-way valve and the fan.

The utility model discloses a concrete working process does:

when the battery is started, the temperature sensor detects the temperature of the battery cell, the controller judges the working state at the moment, and if the temperature of the battery cell is higher than a set maximum value, the heat dissipation mode is started; and if the cell temperature is lower than the set minimum value, starting a heating mode.

A heat dissipation mode: the heat pipe absorbs the heat of the battery core, changes the liquid state into the gas state after reaching the phase change temperature of the phase change material in the heat pipe, rises to the top, changes into the liquid state again after being cooled by air and flows back to the bottom of the heat pipe; the air flows out of the air outlet and enters the heat exchanger, and then enters the module through the air inlet after the temperature is reduced; the controller selects the first working mode and the second working mode after a certain interval time, the opening and the closing of the valve are controlled to change the flow direction of air so as to reduce the temperature difference inside the battery, and the controller can also control the reversing of the reversing valve according to the difference value of different battery core temperatures measured by the temperature sensor.

Heating mode: the heating film is started, the battery cell and the heat pipe are heated simultaneously, when the temperature of the heat pipe is raised to the starting temperature of the heat pipe, the vaporization density of the low-temperature phase change material in the heat pipe is reduced, the low-temperature phase change material moves to the upper part of the heat pipe, the high-temperature phase change material is changed into liquid after exchanging heat with the battery cell with lower temperature and flows back to the bottom again, heat is emitted to heat the battery cell, and the temperature of the battery cell is; simultaneously, hot air enters from the air inlet on the upper part of the module, and exchanges heat with the heat pipe and the battery cell, so that the temperature of the battery cell is ensured to rise quickly. Similar to the heat dissipation mode, the heating mode is also divided into two operation modes, i.e., a first operation mode and a second operation mode.

Specifically, the first operation mode: the four-way valve 13 connects the pipeline 15 with the pipeline 16, the four-way valve 14 connects the

pipelines

19 and 20, air flows through the one-way valve 10, the fan 11 and the four-way valve 13 after being cooled by the vehicle-mounted air conditioner, enters the battery module 12 through the pipeline 16, and flows out through the pipeline 19, the four-way valve 14 and the pipeline 20 after exchanging heat with the battery core and the heat pipe. The second working mode is as follows: the four-way valve 13 connects the pipeline 15 with the pipeline 18 and connects the pipeline 16 with the pipeline 17; the four-way valve 14 connects the pipeline 19 with the pipeline 22, and connects the pipeline 20 with the pipeline 21, and air enters the battery module 12 through the pipeline 15, the four-way valve 13, the pipeline 18, the pipeline 22, the four-way valve 14 and the pipeline 19, exchanges heat with the battery cell 5 and the heat pipe 4, and then flows out of the system through the pipeline 16, the four-way valve 13, the pipeline 17, the pipeline 21 and the four-way valve 14.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a power battery thermal management device of forced air cooling and heat pipe combination which characterized in that: including setting up the heat exchanger in electric automobile air conditioning system and the battery module that passes through pipeline and heat exchanger intercommunication, the battery module includes the module shell and sets up a plurality of electric cores in the module shell, is provided with the heat pipe between two adjacent electric cores, and it is cotton to be provided with the bubble between heat pipe adjacent with the module shell and the module shell.

2. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: the module is characterized in that an air inlet and an air outlet are formed in the module shell, the air inlet is communicated with an air inlet pipeline, the air outlet is communicated with an air outlet pipeline, and the air inlet pipeline and the air outlet pipeline are communicated with the heat exchanger.

3. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: and a heat conduction layer is arranged between the heat pipe and the electric core.

4. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: the top of the heat pipe is higher than the top of the battery core.

5. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: a gap is arranged between the top of the heat pipe and the top of the module shell.

6. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: the bottom in the module shell is provided with a heating film used for heating the battery core and the heat pipe.

7. The combined air cooling and heat pipe power battery thermal management device according to claim 2, characterized in that: the air inlet pipeline and the air outlet pipeline are both provided with a four-way valve, and the air inlet pipeline is also provided with a fan and a one-way valve.

8. The combined air cooling and heat pipe power battery thermal management device according to claim 7, characterized in that: and a pipeline is connected between the four-way valves on the air inlet pipeline and the air outlet pipeline.

9. The combined air cooling and heat pipe power battery thermal management device according to claim 3, characterized in that: the heat conduction layer is a foam metal layer or a heat conduction adhesive layer.

10. The combined air cooling and heat pipe power battery thermal management device according to claim 1, characterized in that: the heat pipe is a gravity type heat pipe, and a gas-liquid phase change material is filled in the heat pipe.