CN-113410545-B - Power battery with temperature control function and temperature control method thereof

Abstract

The invention discloses a power battery with a temperature control function and a temperature control method thereof. The power battery with the temperature control function comprises a battery pack and an extreme temperature control unit, wherein the extreme temperature control unit comprises an outer bin, an inner bin, at least one differential pressure pipeline and a temperature and pressure regulating assembly. The inner bin is positioned between the outer bin and the battery pack, and the outer bin and the inner bin are respectively and correspondingly provided with an accommodating outer cavity and an accommodating inner cavity which can accommodate the refrigerant. The differential pressure pipeline is respectively communicated with the inner bin and the outer bin, so that the air pressure difference of the inner bin and the outer bin can be maintained. The temperature and pressure regulating assembly has a low pressure inlet and a high pressure outlet. One of the high-pressure outlet and the low-pressure inlet of the temperature-regulating pressure assembly is communicated with the accommodating outer cavity, and the other is communicated with the accommodating inner cavity so as to regulate the air pressure of the inner bin and the outer bin, so that the form of the refrigerant accommodated in the inner bin and the outer bin is converted, and the temperature of the battery pack is maintained at the normal temperature. According to the power battery with the temperature control function and the temperature control method thereof, the temperature of the battery pack can be effectively controlled.

Inventors

• CHEN ZHIXIANG
• ZHANG WEILING
• CHEN YAN

Assignees

• 陈志翔
• 陈岩

Dates

Publication Date

20260512

Application Date

20210722

Claims (10)

1. 1. The power battery with the temperature control function is characterized by comprising a battery pack and an extreme temperature control unit, wherein the extreme temperature control unit comprises: the outer bin and the inner bin are positioned between the outer bin and the battery pack, and an accommodating outer cavity and an accommodating inner cavity which can accommodate the refrigerant are correspondingly formed respectively; At least one differential pressure pipeline which is respectively communicated with the accommodating inner cavity and the accommodating outer cavity and can maintain the air pressure difference of the accommodating inner cavity and the accommodating outer cavity, and The temperature and pressure regulating assembly is provided with a high-pressure outlet and a low-pressure inlet, the extreme temperature control unit is configured to have an extremely high-temperature working mode and an extremely low-temperature working mode, when the temperature and pressure regulating assembly is in the extremely high-temperature working mode, the high-pressure outlet of the temperature and pressure regulating assembly is communicated with the accommodating outer cavity, the low-pressure inlet of the temperature and pressure regulating assembly is communicated with the accommodating inner cavity so as to increase the air pressure of the accommodating outer cavity to liquefy the refrigerant and reduce the air pressure of the accommodating inner cavity to gasify the refrigerant to maintain the temperature of the battery pack at a set normal temperature, and when the temperature and pressure regulating assembly is in the extremely low-temperature working mode, the high-pressure outlet of the temperature and pressure regulating assembly is communicated with the accommodating inner cavity so as to increase the air pressure of the accommodating inner cavity to gasify the refrigerant and reduce the air pressure of the accommodating outer cavity to maintain the temperature of the battery pack at the set normal temperature.
2. 2. The power cell with temperature control function according to claim 1, wherein the temperature-regulating pressure assembly comprises a compressor and a reversing assembly, the compressor is provided with the high-pressure outlet and the low-pressure inlet, the reversing assembly comprises first to fourth valves, one ends of the first valve and the second valve are communicated with the low-pressure inlet, one of the other ends of the first valve and the other ends of the second valve is connected with the outer bin, the other ends of the first valve and the other ends of the second valve are connected with the inner bin, one ends of the third valve and the fourth valve are communicated with the high-pressure outlet, one of the other ends of the third valve and the other ends of the fourth valve is connected with the outer bin, and the other ends of the third valve and the other ends of the fourth valve are connected with the inner bin.
3. 3. The power cell with temperature control function as claimed in claim 1, wherein the differential pressure pipe is constructed in a spiral shape.
4. 4. The power cell with temperature control function as recited in claim 1, wherein the outer wall of the inner compartment is made of electrochromic material, the outer wall of the inner compartment being configured to be white in the very low temperature mode and transparent in the very high temperature mode.
5. 5. The power cell with temperature control function as claimed in claim 1, wherein the inner compartment is arranged in a ring shape around the outside of the battery pack and an inner wall of the inner compartment covers an outer wall of the battery pack.
6. 6. The power cell with temperature control function as claimed in claim 1, further comprising a normal temperature control unit, the normal temperature control unit comprising: the heat conduction bin is arranged between the inner bin and the outer bin, a heat conduction cavity is formed in the heat conduction bin, and a heat conduction port communicated with the heat conduction cavity is formed in the heat conduction bin; a brine bin in which a brine cavity is formed, and The normal temperature control unit is configured to have a heat conduction operation mode and a heat insulation operation mode, when the normal temperature control unit is in the heat conduction operation mode, the saline water cavity is communicated with the heat conduction cavity, the air pipeline is not communicated with the heat conduction cavity to conduct heat, when the normal temperature control unit is in the heat insulation operation mode, the saline water cavity is not communicated with the heat conduction cavity, and the air pipeline is communicated with the heat conduction cavity to insulate heat.
7. 7. The power cell with temperature control function as recited in claim 6, further comprising a heat exchange assembly, wherein the heat exchange assembly comprises a first heat exchange valve and a second heat exchange valve, wherein one end of each of the first heat exchange valve and the second heat exchange valve is communicated with the heat conducting cavity, one of the other end of the first heat exchange valve and the other end of the second heat exchange valve is connected with the air pipeline, and the other end of the first heat exchange valve and the other end of the second heat exchange valve are connected with the brine bin.
8. 8. The power cell with temperature control function as recited in claim 6, wherein the thermally conductive cartridge has a wall made of electrochromic material, the thermally conductive cartridge wall being configured to be transparent when in a thermally conductive mode of operation and white when in an thermally insulating mode of operation.
9. 9. The power cell with temperature control function as claimed in claim 6, wherein the battery pack includes a main battery, a first sub-battery and a second sub-battery, the main battery being connected to the first sub-battery to charge the first sub-battery and the second sub-battery, the first sub-battery being for supplying power to the extreme temperature control unit, and the second sub-battery being for supplying power to the normal temperature control unit.
10. 10. A temperature control method based on the power battery of any one of claims 1 to 9, comprising the steps of: When the external temperature is at the set extremely high temperature, the temperature regulating pressure assembly increases the air pressure of the accommodating outer cavity and simultaneously reduces the air pressure of the accommodating inner cavity, so that the refrigerant in the accommodating outer cavity is converted from the gas state to the liquid state to release heat, and the refrigerant in the accommodating inner cavity is converted from the liquid state to the gas state to absorb heat, and the temperature of the battery pack is maintained at the set normal temperature; When the external temperature is at the set extremely low temperature, the temperature-regulating pressure component increases the air pressure in the accommodating inner cavity and reduces the air pressure in the accommodating outer cavity at the same time, so that the refrigerant in the accommodating inner cavity is converted from the gas state to the liquid state to release heat and the refrigerant in the accommodating outer cavity is converted from the liquid state to the gas state to absorb heat, the temperature value of the set extremely high temperature is larger than the set normal temperature, and the temperature value of the set normal temperature is larger than the set extremely low temperature.

Description

Power battery with temperature control function and temperature control method thereof Technical Field The invention relates to the field of batteries, in particular to a power battery with a temperature control function and a temperature control method thereof. Background With the development of social economy, new energy vehicles gradually become important vehicles for people to travel. The power battery plays a vital role as an energy center of a new energy automobile. The comprehensive performance of power batteries, particularly energy efficiency performance in some extreme weather and environmental conditions, is the most important part in new energy vehicle design. Currently, the mainstream power battery design is considered to be safe in use, and certain temperature control measures are mainly used for preventing spontaneous combustion caused by accumulation of a large amount of heat energy generated by the use of the power battery in a high-temperature environment. However, the existing battery has few consideration on the use condition in the severe environment, thereby causing the following problems: (1) Under severe cold conditions, the effective capacity of the battery is reduced sharply due to low temperature, and meanwhile, the effective output power is reduced sharply, and even the battery core is damaged permanently. (2) In a continuous high temperature environment, because the temperature of the battery cell is too high, the cooling system is still supplied with power to reduce the temperature of the battery, and at the moment, the inside of the battery cell is extremely easy to generate local extremely high temperature, so that permanent damage and even spontaneous combustion occur. At this time, a brand new design scheme for controlling the temperature of the power battery is needed, and the problems of all-weather use performance and safety are solved. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a power battery and a temperature control method thereof capable of effectively controlling the internal temperature of the battery in an environment of extreme high and low temperatures. The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a power battery and a temperature control method thereof that can effectively control the internal temperature of the battery in all weather conditions, such as extremely high temperature, extremely low temperature, and normal temperature. The invention further provides a power battery with a temperature control function, which comprises a battery pack and an extreme temperature control unit, wherein the extreme temperature control unit comprises an outer bin and an inner bin, the inner bin is located between the outer bin and the battery pack, an accommodating outer cavity and an accommodating inner cavity which can accommodate refrigerant are respectively formed in the outer bin and the inner bin correspondingly, at least one differential pressure pipeline is respectively communicated with the accommodating inner cavity and the accommodating outer cavity and can maintain the air pressure difference between the accommodating inner cavity and the accommodating outer cavity, a temperature regulating pressure assembly is provided with a high-pressure outlet and a low-pressure inlet, the temperature regulating pressure assembly is configured to have an extremely high temperature operation mode and an extremely low temperature operation mode, when the temperature regulating pressure assembly is in the extremely high temperature operation mode, the high-pressure outlet of the temperature regulating pressure assembly is communicated with the accommodating outer cavity, the low-pressure inlet of the temperature regulating pressure assembly is communicated with the accommodating inner cavity so as to increase the air pressure of the accommodating outer cavity, the air pressure of the refrigerant is respectively communicated with the accommodating inner cavity, the air pressure of the battery is reduced while the air pressure of the accommodating inner cavity is increased, the air pressure of the temperature regulating assembly is simultaneously communicated with the low-pressure of the battery is arranged in the low-pressure assembly, the temperature regulating assembly is simultaneously maintained in the normal operation mode, and the temperature regulating assembly is in the air pressure regulating assembly is communicated with the high-pressure inlet of the air pressure assembly. In addition, the power battery with the temperature control function according to the invention can also have the following additional technical characteristics: According to some embodiments of the invention, the temperature