CN212303763U

CN212303763U - Battery thermal management device of thermoelectric cooling coupling liquid cooling

Info

Publication number: CN212303763U
Application number: CN202020178551.8U
Authority: CN
Inventors: 唐爱坤; 刘朝阳; 李宝民; 沙红军; 熊双元
Original assignee: JIANGSU JIAHE THERMAL SYSTEM RADIATOR CO Ltd; Jiangsu University
Current assignee: JIANGSU JIAHE THERMAL SYSTEM RADIATOR CO Ltd; Jiangsu University
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2021-01-05
Anticipated expiration: 2030-02-17

Abstract

The utility model relates to a battery heat management device of thermoelectric cooling coupling liquid cooling, including liquid cooling module and thermoelectric module, thermoelectric module links to each other with the liquid cooling module, and the battery links to each other with thermoelectric module, thermoelectric module puts cold junction and battery contact, thermoelectric module's hot junction and liquid cooling module contact. The utility model discloses a battery heat management device compares in simple liquid cooling, and battery low temperature rise and high temperature drop all can be greatly improved, have stabilized the temperature of battery pack module in the very big degree, and this kind of refrigeration and the design that the heating integrates have realized the effective rational utilization in automobile space.

Description

Battery thermal management device of thermoelectric cooling coupling liquid cooling

Technical Field

The utility model relates to an electric automobile power battery thermal management heat management field especially relates to a battery thermal management device of thermoelectric cooling coupling liquid cooling.

Background

The existing new energy automobile mainly comprises three types, namely hybrid electric, pure electric and fuel cell electric automobiles, and compared with the traditional internal combustion engine automobile, the new energy automobile is simpler in structure and can realize low emission and even zero emission. However, no matter what new energy automobile, the power supply system of the new energy automobile emits a large amount of heat in continuous discharge, and the high-temperature operating environment can reduce the performance of the new energy automobile and even bring safety threat in severe cases, so that the heat management of the new energy automobile is very important. In order to ensure that the module works safely and efficiently in a proper temperature range, the temperature of the module generally needs to be raised or lowered by means of a heat exchange device.

In the current vehicle-mounted battery thermal management system, the mainstream cooling mode is still liquid cooling, and the thermal management of the battery is realized only by means of a liquid cooling plate and a liquid cooling medium. The existing battery cooling device is generally a micro-channel water plate formed by extrusion in one step, such as the device described in patent application No. CN201721171741 (the patent name is "a battery water cooling plate"), and the device described in patent application No. CN201710363624 (the patent name is "a parallel micro-channel water cooling substrate"), which are all flat plate type liquid cooling devices.

However, in hot summer, the battery is in a high-temperature natural environment for a long time, and due to the use of high-power equipment such as an air conditioner and the like, the battery is in a high-rate discharge working condition, the temperature rise is fast, and the heat accumulated in the battery is also high; in cold winter, the low temperature state can cause the battery to charge slowly, reducing the battery power; meanwhile, the traditional bottom cooling mode can cause the temperature difference between the battery packs to be increased due to the existence of the temperature gradient of the cooling liquid. In these cases, conventional liquid cooling is insufficient to meet the battery thermal management requirements. Therefore, there is a need for more rational thermal management devices to be developed to address the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to this problem, designed a battery thermal management device based on thermoelectric cooling coupling liquid cooling, can realize quick temperature drop under high temperature environment, realize preheating of battery under low temperature environment.

The specific contents of the utility model are as follows: the utility model provides a battery heat management device of thermoelectric cooling coupling liquid cooling, includes liquid cooling module and thermoelectric module, and thermoelectric module links to each other with the liquid cooling module, and the battery links to each other with thermoelectric module, and thermoelectric module's cold junction and battery contact put, thermoelectric module's hot junction and liquid cooling module contact.

Furthermore, the number of the thermoelectric modules is consistent with the number of the batteries.

Further, the thermoelectric module is located at the midpoint of the bottom of the battery.

Further, the liquid cooling module includes the liquid cooling board, and the left side of liquid cooling board is equipped with the coolant liquid import, and the right side of liquid cooling board is equipped with the coolant liquid export.

Furthermore, the liquid cooling plate is an aluminum alloy part, and the material of the cold and hot surfaces of the thermoelectric module is a high-heat-conductivity ceramic material.

Furthermore, the contact parts between the battery and the thermoelectric module and between the thermoelectric module and the liquid cooling module are formed by adopting heat-conducting silicone grease adhesion or welding.

The utility model discloses a battery thermal management device of thermoelectric cooling coupling liquid cooling compares in simple liquid cooling, and battery low temperature rise and high temperature drop can all be greatly improved, have stabilized the temperature of battery group module in the very big degree for group battery work has ensured the work efficiency and the battery cycle life of group battery in stable temperature environment, and this kind of refrigeration and the design that the heating integrates, has realized the effective rational utilization in infrastructure space.

Drawings

The following further explains the embodiments of the present invention with reference to the drawings.

Fig. 1 is a schematic diagram of a thermoelectric cooling coupled liquid-cooled battery thermal management apparatus of the present invention;

fig. 2 is a front view of the thermoelectric cooling coupled liquid-cooled battery thermal management apparatus of the present invention;

FIG. 3 is a top view of a coupling portion of a thermoelectric module and a liquid cooling module according to the present invention;

FIG. 4 is a schematic diagram of temperature of an experimental test curve under an equivalent voltage condition and a differential voltage condition;

FIG. 5 is a diagram of temperature difference of experimental test curves under an equivalent voltage condition and a differential voltage condition;

FIG. 6 is a schematic diagram of experimental test curve temperatures under a differential condition and a segment voltage condition;

FIG. 7 is a schematic diagram of temperature difference of experimental test curves under a difference working condition and a segment voltage working condition.

Detailed Description

In the description of the present embodiment, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present embodiment and simplifying the description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1-3, this embodiment discloses a thermoelectric cooling coupled liquid-cooled battery thermal management device, which includes a liquid-cooled module and a thermoelectric module, where the thermoelectric module is connected to the liquid-cooled module, the battery is connected to the thermoelectric module, a cold end of the thermoelectric module is in contact with the battery, and a hot end of the thermoelectric module is in contact with the liquid-cooled module.

Preferably, in this embodiment, the number of the thermoelectric modules is equal to the number of the batteries, in this embodiment, the number of the batteries is 3, and the number of the batteries is the first battery 1, the second battery 2, and the third battery 3, and the corresponding thermoelectric modules are the first thermoelectric module 4, the second thermoelectric module 5, and the third thermoelectric module 6, respectively.

Preferably, the thermoelectric module is located at the midpoint of the bottom of the cell. The battery thermal management device of the embodiment is not limited to cooling the bottom of the battery pack module as the bottom plate, and can be widely applied to cooling the side and front surfaces of the battery, and can be selected according to specific needs.

Preferably, the liquid cooling module includes liquid cooling plate 9, and the left side of liquid cooling plate 9 is equipped with coolant liquid import 7, and the right side of liquid cooling plate 9 is equipped with coolant liquid export 8. Liquid-cooled board 9 is once stamped by aluminum plate and forms in this embodiment, and coolant liquid import 7 and coolant liquid export 8 link to each other with the water pump through rubber conduit respectively.

In this embodiment, the liquid cooling plate is preferably an aluminum alloy member, and the material of the cold and hot surfaces of the thermoelectric module is a high thermal conductivity ceramic material.

In the preferred embodiment, the contact portions between the battery and the thermoelectric module and between the thermoelectric module and the liquid cooling module are bonded or welded by using heat-conducting silicone grease.

When the device works, the thermoelectric module carries the heat of the battery to the hot end of the thermoelectric module from the bottom of the battery, and then the cooling liquid in the liquid cooling plate is taken away from the battery module, so that the cooling of the battery pack is realized; in the heating mode, the cold and hot surface exchange is realized by changing the current direction of the thermoelectric module, and the battery is heated from the bottom of the battery.

Based on the voltage regulation and control strategy of the thermoelectric cooling coupling liquid cooling of the device, the battery is connected with the thermoelectric module, the thermoelectric module is connected with the liquid cooling module, and the differential voltage of the thermoelectric module is controlled to be sequentially increased in the flowing direction of the liquid cooling module coolant.

The equivalent voltage with a smaller voltage value is selected to control the refrigerating capacity of the thermoelectric module in the early stage and the middle stage of battery discharge, and the differential voltage with a larger voltage value is selected to control the refrigerating capacity of the thermoelectric module in the later stage of battery discharge.

When the battery is in a low-temperature environment, the thermoelectric module realizes cold-hot surface exchange by adjusting the current direction, and the low-temperature battery is preheated in the charging or discharging process.

As shown in fig. 4 and 5, the thermoelectric cooling/liquid cooling coupling based battery thermal management apparatus is obtained by testing curves experimentally under an equivalent voltage condition (Ueq, i.e., the operating voltage value of each thermoelectric module is equal) and a differential voltage condition (Udiff, i.e., the operating voltage value of the thermoelectric module increases in the flow direction of the coolant). The thermoelectric module comprises a schematic diagram of the temperature and the temperature difference of the battery pack, wherein U1, U2 and U3 are voltages of a first thermoelectric module 4, a second thermoelectric module 5 and a third thermoelectric module 6 respectively. As shown, U1, U2 and U3 of the equivalent voltages Ueq4, Ueq5 and Ueq6 are set to be 4V, 5V and 6V, respectively, and U1-4V, U2-5V and U3-6V in the case of the difference voltage. As can be seen in 0-3600s, for the equivalent voltage working condition, the temperature of the battery pack is lower when the voltage value is larger, and the temperature difference is smaller. And the temperature difference of the battery pack are lower than the equivalent voltage under the working condition of the differential voltage.

As can be seen from fig. 4 and 5, compared with the equivalent voltage condition, the maximum average temperature of the battery pack is lower under the differential voltage condition, and the temperature difference between the battery packs is smaller, but in the middle stage of battery discharge, the battery temperature is excessively cooled, which causes unnecessary power loss.

On the basis, a regulation test of segmented voltage (a smaller equivalent voltage is selected in the early stage and the middle stage of discharge, and a larger difference voltage is selected in the later stage of discharge with higher temperature to control the temperature of the battery) is carried out. We then performed a comparison test of the time-phased control voltage and the difference voltage. Specifically, the equivalent voltage Ueq2 and Ueq 3U 1, and U2 and U3 are both 2V and 3V, the difference voltage is set to be U1-4V, U2-5V and U3-6V, the equivalent voltage Ueq3 is selected for the pre-discharge period (0-1200s) for the segment voltage upee, the equivalent voltage Ueq2 is selected for the middle discharge period (1200-2400s), and the difference voltage is selected for the post-discharge period (2400-3600 s).

As shown in fig. 6 and 7, different voltage modes are selected at different moments, so that the temperature rise curve of the battery can be well controlled, the temperature rise of the battery tends to be more gentle in the discharging process of the battery, and the temperature rise is only 2 ℃ at the discharging finishing moment; although the temperature difference between the battery packs fluctuates for 2 times due to the change of voltage, the fluctuation of the temperature at each time is about 1 ℃, and the maximum temperature difference between the battery packs does not exceed 2.2 ℃ in the discharging process. Therefore, the sectional voltage regulation meets the heat dissipation requirement in the battery discharge process.

By using the voltage regulation and control strategy of the embodiment, when the battery is in a high-rate discharge working condition or a high-temperature working condition, the thermoelectric cooling module can realize the rapid management and control of the battery temperature; when the vehicle is in a low temperature environment, the thermoelectric module can realize the exchange of cold and hot surfaces by adjusting the current direction, and preheat the low-temperature battery in the charging/discharging process; and the temperature difference between the battery packs can be reduced.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a battery thermal management device of thermoelectric cooling coupling liquid cooling which characterized in that: including liquid cooling module and thermoelectric module, thermoelectric module links to each other with the liquid cooling module, and the battery links to each other with thermoelectric module, and thermoelectric module puts cold junction and battery contact, and thermoelectric module's hot junction and liquid cooling module contact.

2. The device of claim 1, wherein the thermoelectric cooling coupling liquid-cooled battery thermal management device comprises: the number of the thermoelectric modules is consistent with the number of the batteries.

3. The device of claim 1, wherein the thermoelectric cooling coupling liquid-cooled battery thermal management device comprises: the thermoelectric module is located at the very center of the bottom of the cell.

4. The device of claim 1, wherein the thermoelectric cooling coupling liquid-cooled battery thermal management device comprises: the liquid cooling module comprises a liquid cooling plate, a cooling liquid inlet is formed in the left side of the liquid cooling plate, and a cooling liquid outlet is formed in the right side of the liquid cooling plate.

5. The device of claim 1, wherein the thermoelectric cooling coupling liquid-cooled battery thermal management device comprises: the liquid cooling plate is an aluminum alloy part, and the material of the cold and hot surfaces of the thermoelectric module is a high-heat-conductivity ceramic material.

6. The device of claim 1, wherein the thermoelectric cooling coupling liquid-cooled battery thermal management device comprises: the contact parts between the battery and the thermoelectric module and between the thermoelectric module and the liquid cooling module are formed by adopting heat conduction silicone grease adhesion or welding.