CN214957063U

CN214957063U - Thermal management system of PACK battery box

Info

Publication number: CN214957063U
Application number: CN202122543815.2U
Authority: CN
Inventors: 杨书廷; 李垒; 李秋洋; 杨多胜
Original assignee: Henan Power Battery Innovation Center Co ltd; Battery Research Institute Of Henan Co ltd
Current assignee: Henan Power Battery Innovation Center Co ltd; Battery Research Institute Of Henan Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2021-11-30
Anticipated expiration: 2031-10-22

Abstract

The utility model discloses a heat management system of a PACK battery box, which comprises a first circulating system and a second circulating system; the micro compressor in the first circulating system is connected with a PACK external heat exchanger through a first interface and a second interface of a four-way reversing valve, and the PACK external heat exchanger, a drying and filtering liquid storage device, an electronic expansion valve and a first heat exchange channel of an intermediate heat exchanger are connected in sequence and then connected with a third interface of the four-way reversing valve; the fourth interface of the four-way reversing valve is connected with a gas-liquid separator. The second circulating system comprises a circulating pump, an expansion container, a battery cold plate, a phase change heat storage regenerator, a three-way reversing valve and a second heat exchange channel of the intermediate heat exchanger which are connected in a closed loop manner in sequence; and a third interface of the three-way reversing valve is communicated with the battery cold plate. The utility model discloses a thermal management system of PACK battery box can adjust the group battery to best operating temperature fast, has reduced the reliance to whole car temperature control system and external environment.

Description

Thermal management system of PACK battery box

Technical Field

The utility model belongs to the technical field of the battery box, especially, relate to a thermal management system of PACK battery box.

Background

The power battery has poor adaptability to low-temperature environment and high-temperature environment, and after the battery is placed in the low-temperature environment, the battery needs to be heated to the working temperature of the battery before use; during the rapid charging process of the battery in a high-temperature environment, the battery pack needs to be cooled to prevent the battery from being damaged or causing safety accidents due to the overhigh temperature of the battery.

In the prior art, the temperature rise of the battery at low temperature mainly utilizes an external power supply, such as a charging pile and the like, or consumes the electric quantity of the battery to use a PTC heating film and the like. The heating mode by using the charging pile is limited by the facility of the charging pile; and the PTC heating mode consuming the electric quantity of the battery is low in energy efficiency ratio and has large influence on battery endurance. At present, an air conditioning system of a whole vehicle or an external cold source is mainly adopted for cooling the battery, and the battery is greatly limited by the adaptation of the whole vehicle and the adaptation of an environmental cold source. And the work of the PACK battery box is started when the environmental temperature is too low or too high, which is not beneficial to the performance of the battery core and has potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: provided is a thermal management system of a PACK battery box, which can rapidly cool or heat the battery box and reduce the dependence on an overall vehicle temperature control system and the external environment.

The technical scheme of the utility model is that:

a thermal management system of a PACK battery box comprises a first circulating system and a second circulating system; the first circulating system comprises a micro compressor, a four-way reversing valve, a PACK external heat exchanger, a drying and filtering liquid storage device, an electronic expansion valve and an intermediate heat exchanger; the intermediate heat exchanger is a heat exchanger arranged in the PACK battery box body, and a first heat exchange channel and a second heat exchange channel which are not communicated are arranged in the intermediate heat exchanger; the micro compressor is communicated with a first interface of the four-way reversing valve, a second interface of the four-way reversing valve is connected with the PACK external heat exchanger, and first heat exchange channels of the PACK external heat exchanger, the drying and filtering liquid storage device, the electronic expansion valve and the intermediate heat exchanger are connected in sequence and then connected with a third interface of the four-way reversing valve; the fourth interface of the four-way reversing valve is communicated with a gas-liquid separator connected with the other end of the micro compressor; the second circulating system comprises a circulating pump, an expansion container, a battery cold plate, a phase change heat storage regenerator, a three-way reversing valve and a second heat exchange channel of the intermediate heat exchanger which are connected in a closed loop manner in sequence; the battery cold plate is a plate-tube heat exchanger arranged on the side edge of the battery pack; the inlet of the battery cold plate is connected with the expansion container, and the outlet of the battery cold plate is respectively communicated with the third interface of the three-way reversing valve and the phase-change heat storage regenerator.

Preferably, the micro compressor, the drying and filtering liquid storage device, the electronic expansion valve, the intermediate heat exchanger, the circulating pump, the expansion container, the battery cold plate, the phase change heat storage regenerator, the gas-liquid separator and the three-way reversing valve are all installed in the PACK battery box body.

Preferably, the circulating working medium in the second circulating system is glycol-type cooling liquid.

The utility model has the advantages that: the heat management system of the PACK battery box of the utility model is mutually matched by the first circulating system and the second circulating system, so that the PACK battery box is in a running state with low power and high energy efficiency ratio for most of time and stores cold or heat; the stored cold energy or heat can quickly adjust the battery PACK which is kept still in an overheated or supercooled environment for a long time to the optimal working temperature, and the dependence of the PACK battery box on a finished automobile temperature control system and an external environment is reduced.

Drawings

FIG. 1 is the battery box structure schematic diagram of the thermal management system of PACK battery box of using the utility model discloses a.

Fig. 2 is an exploded view of the structure of fig. 1.

FIG. 3 is the utility model discloses a thermal management system working principle of PACK battery box is shown.

In the figure:

1. a micro compressor; 2. a four-way reversing valve; 3. a PACK external heat exchanger; 4. drying and filtering the liquid storage device; 5. an electronic expansion valve; 6. an intermediate heat exchanger; 61. a first heat exchange passage; 62. a second heat exchange passage; 7. a circulation pump; 8. an expansion vessel; 9. a battery cold plate; 10. a phase-change heat storage regenerator; 11. a three-way reversing valve; 12. a gas-liquid separator; 13. a battery pack; 14. PACK battery box.

Detailed Description

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

Fig. 1 is the use the utility model discloses a battery box structural schematic of thermal management system of PACK battery box, fig. 2 is the structure explosion chart of fig. 1, and fig. 3 is the utility model discloses a thermal management system working principle diagram of PACK battery box.

As shown in fig. 1, 2 and 3, the thermal management system of a PACK battery box of the present invention includes a first circulation system and a second circulation system; the first circulating system comprises a micro compressor 1, a four-way reversing valve 2, a PACK external heat exchanger 3, a drying and filtering liquid storage device 4, an electronic expansion valve 5 and an intermediate heat exchanger 6; the intermediate heat exchanger 6 is a heat exchanger arranged in the PACK battery box 14, and a first heat exchange channel 61 and a second heat exchange channel 62 which are not communicated are arranged in the intermediate heat exchanger 6; the micro compressor 1 is communicated with a first interface of the four-way reversing valve 2, a second interface of the four-way reversing valve 2 is connected with the PACK external heat exchanger 3, and the PACK external heat exchanger 3, the drying and filtering liquid storage device 4, the electronic expansion valve 5 and a first heat exchange channel 61 of the intermediate heat exchanger 6 are connected with a third interface of the four-way reversing valve 2 after being sequentially connected; the fourth interface of the four-way reversing valve 2 is communicated with a gas-liquid separator 12 connected with the other end of the micro compressor 1; the second circulating system comprises a circulating pump 7, an expansion container 8, a battery cold plate 9, a phase change heat storage regenerator 10, a three-way reversing valve 11 and a second heat exchange channel 62 of the intermediate heat exchanger 6 which are sequentially connected in a closed loop; the battery cold plate 9 is a plate-tube heat exchanger arranged on the side of the battery pack 13; the inlet of the battery cold plate 9 is connected with the expansion container 8, and the outlet of the battery cold plate 9 is respectively communicated with the third interface of the three-way reversing valve 11 and the phase-change heat storage regenerator 10.

The working principle is as follows:

the utility model discloses a thermal management system of PACK battery box includes first circulation system and second circulation system, wherein:

the circulation flow direction of the working medium in the first circulation system during refrigeration is as follows:

the micro-compressor 1 → the four-way selector valve 2 → the PACK outer heat exchanger 3 → the filter drier 4 → the electronic expansion valve 5 → the intermediate heat exchanger 6 in the first heat exchange passage 61 → the four-way selector valve 2 → the gas-liquid separator 12 → the micro-compressor 1.

The circulation flow direction of the working medium in the first circulation system during heating is as follows:

the micro-compressor 1 → the first heat exchange passage 61 of the intermediate heat exchanger 6 → the electronic expansion valve 5 → the dry filter 4 → the PACK outer side heat exchanger 3 → the four-way selector valve 2 → the gas-liquid separator 12 → the micro-compressor 1.

The working medium in the first circulating system is Freon or carbon dioxide and the like.

The working medium circulation of the second circulation system has two flow paths which are respectively:

phase change flow path: the circulating pump 7 → the second heat exchange passage 62 of the intermediate heat exchanger 6 → the three-way reversing valve 11 → the phase change heat storage regenerator 10 → the battery cold plate 9 → the expansion vessel 8 → the circulating pump 7;

non-phase change flow path: the circulation pump 7 → the second heat exchange passage 62 of the intermediate heat exchanger 6 → the three-way selector valve 11 → the battery cold plate 9 → the expansion vessel 8 → the circulation pump 7.

When the PACK battery box is operated in a higher temperature environment, the temperature in the PACK battery box 14 needs to be lowered to lower the temperature of the battery PACK 13, and the following operations are performed: under the control of the four-way reversing valve 2, the first circulating system circulates according to the circulating flow direction of the working medium during refrigeration, forced refrigeration is carried out on the first heat exchange channel 61 by forced heat dissipation to the external environment through the PACK outer side heat exchanger 3, and heat exchange is carried out between the first heat exchange channel 61 and the second heat exchange channel 62; meanwhile, the three-way reversing valve 11 is switched to a non-phase change flow path in the second circulation system, the second heat exchange channel 62 of the intermediate heat exchanger 6 cools the circulation working medium in the circulation process, the circulation working medium cools the battery cold plate 9, and the battery cold plate 9 cools the battery pack 13 to a required proper temperature. When the PACK battery box is cooled to a required proper temperature area and continues to work, the three-way reversing valve 11 is switched to the phase change flow path in the second circulating system, and the working medium in the phase change heat storage and cold storage device 10 performs phase change cold storage while the PACK battery box is kept at a proper working temperature.

When the PACK battery box needs to be started when being statically arranged in a temperature region higher than the working temperature of the battery for a long time, the battery is in a high-temperature environment for a long time, the battery can also generate heat when being started, and the battery is required to be cooled down quickly at the moment so as to ensure the safety of the battery. At this time, the second circulation system is switched to the phase change flow path through the three-way reversing valve 11, and the first circulation system is started to perform forced cooling. On one hand, after the first circulation system forcibly refrigerates the first heat exchange channel 61, the second heat exchange channel 62 exchanges heat with the first heat exchange channel 61 and then cools the first heat exchange channel 61, the second heat exchange channel 62 cools the circulation working medium in the circulation process, and the circulation working medium cools the battery cold plate 9 in the second circulation system; on the other hand, the phase-change heat storage regenerator 10 absorbs heat from the phase-change cold storage working medium to perform phase-change refrigeration, so that the cooling speed of the battery cold plate 9 is accelerated, the battery PACK 13 is rapidly cooled to a working temperature region, the battery PACK 13 is favorable for rapidly entering a safe working state, and the safety of the PACK battery box during rapid starting at high temperature is enhanced.

When the PACK battery box is operated in a low-temperature environment, it is necessary to raise the temperature in the PACK battery box 14 to raise the temperature of the battery PACK 13, as follows: under the control of the four-way reversing valve 2, the first circulating system circulates according to the circulating flow direction of the working medium during heating, the first heat exchange channel 61 is heated by forcibly absorbing heat from the external environment through the PACK outer side heat exchanger 3, and the first heat exchange channel 61 and the second heat exchange channel 62 exchange heat; meanwhile, the three-way reversing valve 11 is switched to a non-phase change flow path in the second circulation system, the second heat exchange channel 62 of the intermediate heat exchanger 6 heats the circulation working medium in the circulation process, the circulation working medium heats the battery cold plate 9, and the battery cold plate 9 heats the battery pack 13 to a required proper temperature. When the PACK battery box rises to a required proper temperature area to continue working, the three-way reversing valve 11 is switched to the phase change flow path in the second circulating system, and the working medium in the phase change heat storage regenerator 10 performs phase change heat storage while the PACK battery box is kept at a proper working temperature.

When the PACK battery box needs to be started when being statically placed below a battery working temperature region for a long time, the battery is already in a low-temperature environment for a long time, the battery activity is low, the electrical property of the battery cannot be well exerted, and the starting is difficult. At this time, the second circulation system is switched to the phase change flow path through the three-way reversing valve 11, and the first circulation system is started to forcibly heat. On one hand, after the first heat exchange channel 61 is heated by the first circulating system, the temperature is raised after heat exchange is carried out between the first heat exchange channel 61 and the second heat exchange channel 62, the temperature of the circulating working medium is raised by the second heat exchange channel 62 in the circulating process, and the battery cold plate 9 is heated by the circulating working medium; on the other hand, the phase-change heat storage regenerator 10 performs phase-change heat release on the phase-change heat storage working medium, so that the heating speed of the battery cold plate 9 is accelerated, the battery pack 13 is rapidly heated to a working temperature region, the rapid start of the battery pack 13 is facilitated, and the optimal electrical performance of the battery is fully exerted.

The utility model discloses a thermal management system of PACK battery box mutually supports through first circulation system and second circulation system, get into through second circulation system phase transition heat-retaining or cold-storage when normal operating temperature scope at the PACK battery box, make its most time be in miniwatt and high energy efficiency ratio state operation, and can heat up when needs rapid heating and can cool down, can be fast with the group battery adjustment to the best operating temperature of standing for a long time in overheated or supercooled environment, the dependence of PACK battery box to whole car temperature control system and external environment has been reduced.

Preferably, the micro compressor 1, the drying and filtering liquid storage device 4, the electronic expansion valve 5, the intermediate heat exchanger 6, the circulating pump 7, the expansion container 8, the battery cold plate 9, the phase change heat storage cold accumulator 10, the gas-liquid separator 12 and the three-way reversing valve 11 are all installed in the PACK battery box 14. The components are arranged in the PACK battery box body 14, so that the thermal management system of the PACK battery box is compact in structure and more suitable for modularized manufacture.

It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. The above-described technical features may be combined with each other as long as they do not conflict with each other. In addition, the above embodiments are only some embodiments, not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention based on the embodiments of the present invention.

Claims

1. The thermal management system of the PACK battery box is characterized by comprising a first circulating system and a second circulating system; the first circulating system comprises a micro compressor, a four-way reversing valve, a PACK external heat exchanger, a drying and filtering liquid storage device, an electronic expansion valve and an intermediate heat exchanger; the intermediate heat exchanger is a heat exchanger arranged in the PACK battery box body, and a first heat exchange channel and a second heat exchange channel which are not communicated are arranged in the intermediate heat exchanger; the micro compressor is communicated with a first interface of the four-way reversing valve, a second interface of the four-way reversing valve is connected with the PACK external heat exchanger, and first heat exchange channels of the PACK external heat exchanger, the drying and filtering liquid storage device, the electronic expansion valve and the intermediate heat exchanger are connected in sequence and then connected with a third interface of the four-way reversing valve; the fourth interface of the four-way reversing valve is communicated with a gas-liquid separator connected with the other end of the micro compressor; the second circulating system comprises a circulating pump, an expansion container, a battery cold plate, a phase change heat storage regenerator, a three-way reversing valve and a second heat exchange channel of the intermediate heat exchanger which are connected in a closed loop manner in sequence; the battery cold plate is a plate-tube heat exchanger arranged on the side edge of the battery pack; the inlet of the battery cold plate is connected with the expansion container, and the outlet of the battery cold plate is respectively communicated with the third interface of the three-way reversing valve and the phase-change heat storage regenerator.

2. The PACK battery box thermal management system of claim 1, wherein the micro compressor, the dry filtration reservoir, the electronic expansion valve, the intermediate heat exchanger, the circulation pump, the expansion vessel, the battery cold plate, the phase change heat storage regenerator, the gas-liquid separator and the three-way reversing valve are all mounted in the PACK battery box.

3. The thermal management system for a PACK battery box according to claim 1, wherein the circulating fluid in the second circulation system is a glycol-type coolant.