CN208674326U - Electric vehicle power battery temperature management system - Google Patents

Abstract

The utility model provides a kind of electric automobile power battery temperature management system, including motor compressor, compressor controller, high-voltage relay, power battery, battery management control modules, 12V power supply, the first ventilation shaft, the second ventilation shaft and Battery case；Wherein, the inside of Battery case is separated into different sections by partition, is separately installed with battery in each section, temperature sensor is provided with around battery；Second ventilation shaft is separately mounted in each section, second ventilation shaft is connected to the first ventilation shaft, first ventilation shaft is connected to the air outlet of motor compressor, the air inlet of motor compressor is connected to by air-conditioning duct with air conditioning for automobiles, it is equipped in air-conditioning duct by the solenoid valve of solenoid valve controller control opening and closing, temperature-sensing wax type volume damper is installed in the second ventilation shaft.The consistency of battery temperature after the utility model is cooled down using the synchronism and holding for realizing different battery pack coolings.

Description

Electric vehicle power battery temperature management system

technical field

The utility model relates to the technical field of electric vehicle power battery thermal management, more particularly, to an electric vehicle power battery temperature management system.

Background technique

The consistency of electric vehicle power battery is the main factor to ensure the discharge performance and service life of the battery, and it has a significant impact on the power and economy of electric vehicles. Although the power battery has undergone strict consistency screening, during the actual use of the vehicle, due to driving needs, frequent high-current discharge work exists for a long time, the temperature of the battery increases significantly, and there is temperature imbalance between the battery cells. Discharge performance, safety, and life are difficult to guarantee.

At present, there are many researches on thermal management methods of power batteries for electric vehicles, and the thermal management schemes are different, but the purpose is to establish a cooling system inside the battery box, take away the heat released by the battery through the operation of the cooling system, and reduce the battery temperature to ensure The battery is maintained within the normal operating temperature range to improve consistency and ensure discharge performance, life and safety.

More public information shows that the discharge capacity, cycle life and safety of the battery cells vary greatly depending on the temperature of the battery cells. The greater the temperature difference between the cells, the greater the performance difference. Consistency is the main factor to ensure similar performance of battery cells such as discharge capacity and safety. Therefore, the goal of thermal management development of electric vehicle power batteries is not only to reduce battery temperature, but also to achieve the control of battery cell temperature consistency. Including the temperature consistency of battery cells after thermal management, and the synchronization of battery cell cooling during thermal management.

Although the existing power battery thermal management methods can effectively solve the problem of temperature rise during battery discharge, it ignores whether the cooling system can achieve the temperature consistency or uniformity of all single cells. There are mainly two types of existing battery thermal management systems. Management method:

The first is the centralized cooling method. When the battery management control module detects that the temperature of some batteries rises to the upper limit of the safety threshold (take 50°C as an example), the cooling system is turned on, and the cold air directly enters the entire battery box, and the battery box is cooled by the cold air. When the internal temperature falls below the lower limit of the safety threshold (take 35°C as an example), the disadvantage of this method is that the consistency of the battery temperature rise is not considered. , although the temperature of all batteries can be reduced to the normal operating range (below 35°C) after thermal management, due to differences in the temperature rise of battery cells, the temperature range between the battery cells after thermal management spans a lot, such as some drop When the temperature reaches 20°C, and some are 35°C, the battery temperature consistency cannot be achieved after thermal management.

The second method is to thermally manage the batteries inside the battery box in groups, and control the cooling of each group of batteries through solenoid valves, so that the battery pack with high temperature is cooled, and the battery pack with low temperature is not cooled. Although this method can solve the problem of battery temperature consistency after thermal management, it ignores the synchronization of temperature reduction during thermal management. Because the solenoid valve only controls whether each branch is thermally managed or not, and has no cooling air volume adjustment ability, and the cooling capacity of the first and second branches is the same, the cooling process of the first and second branches is obviously fast. sex.

Utility model content

In view of the above problems, the purpose of the present invention is to provide an electric vehicle power battery temperature management system to solve the problem that the existing power battery thermal management methods cannot achieve the consistency of the battery temperature after thermal management and cannot guarantee the synchronization of temperature reduction. question.

The electric vehicle power battery temperature management system provided by the utility model includes: an electric compressor, a compressor controller, a high-voltage relay, a power battery, a battery management control module, a 12V power supply, a first ventilation duct, a second ventilation duct and a battery box The interior of the battery box is divided into different sections by partitions, the two ends of each section are respectively provided with an air inlet and an air outlet, and batteries arranged in a matrix are installed in each section. A temperature sensor is arranged between the row batteries; the second ventilation ducts are respectively installed in each section of the battery box, and each second ventilation duct respectively includes a second main pipeline and a second branch pipeline communicated with the second main pipeline, The outlet of the second branch pipeline is located at the front end of the first row of batteries, the second main pipeline extends out of the battery box through the air inlet, and a temperature-sensing wax type air volume regulating valve is installed in the second main pipeline; the first ventilation pipeline includes The first main pipeline and the first branch pipeline communicated with the first main pipeline, the first branch pipeline is in communication with the second main pipeline, the first main pipeline is in communication with the air outlet of the electric compressor, and the air inlet of the electric compressor passes through The air conditioning pipeline is connected with the automobile air conditioner, and a solenoid valve controlled by the solenoid valve controller is installed in the air conditioning pipeline; the battery management control module includes n sensor pins, one solenoid valve controller pin, and two compressors. Controller pins, one high-voltage relay pin and two power pins, where n=the number of temperature sensors, each of the n sensor pins is connected to a temperature sensor, and the two power pins are connected to the positive and negative poles of the 12V power supply, respectively Connection; the solenoid valve controller includes five pins, the first pin is connected with the solenoid valve controller pin, the second pin is connected with the positive pole of the 12V power supply, the third pin is connected with the negative pole of the 12V power supply, the fourth and The fifth pin is connected to the solenoid valve; the compressor controller includes nine pins, the first pin is connected to the positive pole of the 12V power supply after being connected in series with the car air conditioner switch, the first pin is connected to the negative pole of the 12V power supply, the third and the third are connected to the negative pole of the 12V power supply. The six pins are connected to two compressor controller pins, the fifth pin is connected to the negative pole of the power battery, and the seventh to ninth pins are respectively connected to the electric compressor; the high-voltage relay includes two coil pins and two Relay pins, one of the coil pins is connected to the negative pole of the 12V power supply, and the other coil pin is connected to the high-voltage relay pin; one of the relay pins is connected to the fourth pin of the compressor controller, and the relay pin Connect to the positive terminal of the power battery.

In addition, a preferred structure is that the temperature-sensing wax type air volume control valve includes: an upper valve body, a lower valve body, a push rod, a valve disc, and a temperature-sensing package; wherein, the temperature-sensing package is sealed at the bottom of the lower valve body through a sealing cover, and is located at the bottom of the lower valve body. The temperature-sensing package is encapsulated with temperature-sensing wax; the upper valve body is buckled on the lower valve body, and the interior of the upper valve body is divided into two cavities through the inner wall according to the air inlet direction, an opening is opened on the inner wall, and the valve disc is sleeved At the top of the push rod, the bottom end of the push rod is inserted into the temperature wax through the opening downward, and the valve disc at the top of the push rod opens or closes the opening; A pre-compression spring is sleeved on the rod, and the pre-compression spring is limited between the boss and the lower valve body.

Compared with the prior art, the electric vehicle power battery temperature management system provided by the utility model controls the air intake volume of the cold air of each branch independently through the temperature-sensing wax-type air volume regulating valve of each branch and the temperature sensor, thereby realizing the synchronization of cooling of different battery packs. and maintain the consistency of battery temperature after cooling.

To achieve the above and related objects, one or more aspects of the present invention include the features described in detail hereinafter. The following description and accompanying drawings illustrate certain exemplary aspects of the invention in detail. These aspects are indicative, however, of but a few of the various ways in which the principles of the present disclosure may be employed. Furthermore, this disclosure is intended to include all such aspects and their equivalents.

Description of drawings

Other objects and results of the present invention will become clearer and easier to understand by referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention. In the attached image:

1 is a schematic structural diagram of an electric vehicle power battery temperature management system according to an embodiment of the present invention;

2 is an electrical schematic diagram of an electric vehicle power battery temperature management system according to an embodiment of the present invention;

3 is a schematic structural diagram of a temperature-sensing wax type air volume regulating valve according to an embodiment of the present invention.

The reference signs include: electric compressor A, compressor controller B, high voltage relay C, automotive air conditioner switch D, power battery E, battery management control module F, 12V power supply G, solenoid valve controller H, first ventilation Pipe 1, second ventilation duct 2, battery box 3, partition 31, air inlet 32, air outlet 33, battery 4, temperature sensor 5, air conditioning pipeline 6, temperature-sensing wax type air volume control valve 7, upper valve body 71 , Lower valve body 72 , push rod 73 , boss 731 , valve disc 74 , temperature bulb 75 , temperature wax 76 , pre-compression spring 77 , sealing cover 78 , solenoid valve 8 .

Detailed ways

In order to better illustrate the technical solutions of the present invention, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 respectively show the structure and electrical principle of the electric vehicle power battery temperature management system according to the embodiment of the present invention.

As shown in Figure 1 and Figure 2 together, the electric vehicle power battery temperature management system provided by the present invention includes: an electric compressor A, a compressor controller B, a high-voltage relay C, an automobile air conditioner switch D, a power battery E, a battery The management control module F, the 12V power supply G, the first ventilation duct 1, the second ventilation duct 2 and the battery box 3; wherein, the interior of the battery box 3 is divided into different sections by partitions 31, and three are shown in FIG. 1 . Each section is provided with air inlets 32 and air outlets 33 at both ends of each section. Batteries 4 arranged in a matrix are installed in each section. In FIG. 1 , batteries 4 arranged in a 4*3 matrix are installed in each section. The battery 4 (the battery 4 arranged in a 4*3 matrix is described below), a temperature sensor 5 is arranged between two adjacent columns of batteries 4, that is, two temperature sensors 5 are arranged in each interval, and the temperature sensor 5 The middle position is preferred.

The second ventilation ducts 2 are respectively installed in each section of the battery case 3 , and each second ventilation duct 2 includes a second main pipeline and a second branch pipeline communicated with the second main pipeline. The number is the same as the number of sections. The outlet of the second branch pipeline is located at the front end of the first row of batteries near the air inlet 32. The second main pipeline passes through the air inlet 32 and extends out of the battery box 3, from the second main pipeline to the section. Cold air is introduced into the battery 4 to cool down the battery 4, and the hot air after heat exchange is discharged from the air outlet 33. A temperature-sensing wax-type air volume regulating valve 7 is installed in each second main pipeline, and the temperature-sensing wax type air volume regulating valve 7 is based on the preset. The set initial expansion critical temperature value is automatically opened or closed, and the opening of the temperature-sensing wax type air volume control valve 7 is adaptively adjusted according to the temperature of the battery 4 in the interval, thereby realizing the air volume adjustment function of the second branch pipeline.

Taking the two sections in Fig. 1 as an example, the batteries 4 in the two sections are independent of each other, and independent thermal management can be achieved in each section. If the temperature in section 1 rises more than If the temperature rises in section 2, the temperature-sensing wax of the temperature-sensing wax type air volume control valve 7 in section 1 is in a relatively high temperature environment. The opening degree of the wax-type air volume control valve 7 is smaller than the opening degree of the temperature-sensing wax-type air volume control valve 7 in section 1, then the flow of cold air entering section 1 is greater than the flow of cold air entering section 2, therefore, the cooling effect of branch 1 is stronger . The temperature-sensing wax type air volume control valve 7 can automatically realize that the flow rate of the cold air entering the area with a large temperature rise is large, and the flow rate of the cold air entering the area with a small temperature rise is small, so as to realize the synchronization of different temperature rise and fall, and avoid the occurrence of various sections. The problem of obvious difference in cooling time.

The first ventilation duct 1 includes a first main pipeline and a first branch pipeline that communicates with the first main pipeline. The branch pipeline is connected with a second main pipeline, the first main pipeline is connected with the air outlet of the electric compressor A, and the air inlet of the electric compressor A is connected with the automobile air conditioner through the air conditioning pipeline 6. Solenoid valve 8, the solenoid valve 8 is controlled by the solenoid valve controller H to open and close, the solenoid valve is used to control the opening or closing of the air conditioning pipeline 6, and the electric compressor A disperses the cold air of the automobile air conditioning and air conditioning through the first ventilation duct 1. The second ventilation duct 2 is then introduced into each section of the battery box 3 through each temperature-sensing wax type air volume regulating valve 7 to cool the batteries in each section. Whether the battery 4 in each section needs to be cooled and the amount of cold air flow is controlled by the temperature-sensing wax-type air volume control valve 7 and the temperature sensor 5 in each branch (only the temperature-sensing wax-type air volume control valve 7 is required to be controlled separately when the air conditioner is turned on). Thermal management and thermal management capability), the cold air exchanges heat with the air around the battery 4, and takes away the hot air, so that the temperature of the air around the battery 4 is lowered.

The battery management control module F includes: 1, 2...2n+6 pins, of which pins 1-2n are all sensor pins, which are respectively connected with 2n temperature sensors 5, and n is the interval after the battery box 3 is separated. Since there are two temperature sensors 5 installed in an interval, the total number of temperature sensors 5 is 2n; pin 2n+1 is the solenoid valve controller pin, which is connected to the solenoid valve controller H; pin 2n +2 and pin 2n+3 are compressor controller pins respectively, connected with compressor controller B; pin 2n+4 is high voltage relay pin, connected with high voltage relay C; pin 2n+5 and pin 2n+6 are two power pins, which are connected to the positive and negative poles of the 12V power supply G respectively.

Solenoid valve controller H includes pins 1-5, pin 1 is connected with pin 2n+1 of battery management control module F, pin 2 is connected with the positive pole of 12V power supply G, and pin 3 is connected with the negative pole of 12V power supply G , pins 4 and 5 are connected to the solenoid valve 8 respectively.

Compressor controller B includes pins 1-9. Pin 1 is connected to the positive pole of the 12V power supply G after being connected in series with the car air conditioner switch D, the first pin is connected to the negative pole of the 12V power supply G, and pin 3 is connected to the battery management control module F. The 2n+3 pin of the battery is connected, the pin 5 is connected with the negative pole of the power battery E, the pin 6 is connected with the pin 2n+2 of the battery management control module F, and the pins 7-9 are connected with the electric compressor A respectively.

High voltage relay C includes pin 30 and pin 85-87, pin 30 and pin 87 are relay pins, while pins 85 and 86 are coil pins, pin 30 is with pin 4 of compressor controller B Connection, pin 85 is connected to the negative pole of the 12V power supply G, pin 86 is connected to the pin 2n+4 of the battery management control module F, and pin 87 is connected to the negative pole of the power battery E.

When the air conditioner needs to be turned on, manually turn on the car air conditioner switch D, then the pin 1 of the compressor controller B gets 12V+, so that the pins 1 and 2 of the compressor controller B form a 12V power supply, then the compressor controller B Pin 6 sends a 0V low level signal to pin 2n+2 of the battery management control module F, and pin 2n+1 of the battery management control module F sends a 0V low level enable signal, the solenoid valve controller H works, the solenoid The valve 8 is opened, and then the pin 2n+4 of the battery management control module sends a 12V+ high level signal to the coil pin 86 of the high-voltage relay C, then the coil pins 85 and 86 are powered by 12V, and the relay pins 30 and 87 are connected , the pins 4 and 5 of the electric compressor A get the power of the power battery E, the electric compressor A starts to work, and the air conditioning system runs.

When the air conditioner is running, if the temperature rise of a certain battery branch exceeds the preset threshold (assuming 50°C), the temperature-sensing wax-type air volume control valve 7 in this branch is automatically opened. At this time, the temperature sensor 5 is not required to participate in the work. The air enters this branch to cool the surrounding air of the battery 4 , and when the air temperature of the branch drops to 35° C., the temperature-sensitive wax type air volume regulating valve 7 is automatically closed.

When the air conditioner is in the stopped state, the electric compressor A does not work, and the battery management control module F monitors the temperature of the battery 4 in real time through the temperature sensor 5. The temperature sensors 1 and 2 are responsible for the temperature monitoring of the battery 4 in branch 1, and the temperature sensor 2n -1, 2n are responsible for the temperature monitoring of the battery 4 of branch n. When the air temperature monitoring near any branch battery (take branch 1 as an example) exceeds 50°C, the battery management control module F receives the corresponding temperature sensor signal input and exceeds the safety threshold (sensor signal 0-5V, set 3V corresponding to 50℃), then the pin 2n+4 of the battery management control module F sends a 12V+ high-level signal to the coil pin 86 of the high-voltage relay C, then the coil pins 85 and 86 are powered 12V, relay pins 30 and 87 are connected, pins 4 and 5 of compressor controller B get the power of power battery E, electric compressor A works, because there is no need to turn on the air conditioner, pin 2n of battery management control module F +1 does not send a 0V low level enable signal, then the battery management control module F controls the solenoid valve 8 to not work at this time, then there is no wind at the air outlet of the air conditioner, and all the cold air enters the first ventilation duct 1, because the temperature exceeds 50 ℃ , then the temperature-sensing wax-type air volume regulating valve 7 of branch 1 is opened, and branch 1 is used for battery cooling. Since the ambient air temperature of branch 2 and 3 batteries is lower than 50°C, only the temperature-sensing wax-type air volume regulating valve 7 of branch 1 is opened, and finally Realize the battery thermal management of branch 1. When the battery management control module F receives the output signal of the temperature sensor 5 around the battery 4 of the branch 1 is lower than 35 ℃, the pin 2n+4 of the battery management control module F sends a 0V low level signal To the coil pin 86 of the high-voltage relay C, the coil pins 85 and 86 lose 12V power, the relay pins 30 and 87 are disconnected, the pins 4 and 5 of the electric compressor A have no power, and the electric compressor A stops working. , the battery thermal management of branch one ends.

When the air conditioner is not turned on and the battery thermal management has a special situation, for example, the battery management control module F receives the output signal of the temperature sensor 5 around the battery 4 in the branch 1 is higher than 50°C, and the temperature sensing wax type air volume control valve 7 of the branch 1 senses the temperature sensor. The failure of the warm wax causes the temperature-sensing wax type air volume control valve 7 to close. At this time, the electric compressor A is still working, and the air pressure in the pipeline rises. When the air pressure safety threshold is reached, the pin 3 of the compressor controller B sends out 0V low The level signal is sent to pin 2n+3 of the battery management control module F, then the pin 2n+4 of the battery management control module F sends a 0V low level signal to the coil pin 86 of the high-voltage relay C, then the coil pin 85, 86 loses power at 12V, relay pins 30 and 87 are disconnected, pins 4 and 5 of electric compressor A have no power supply, electric compressor A stops working, and battery management control module F reports the temperature-sensing wax type air volume adjustment of branch 1 The valve 7 fails, so as to realize the system protection when the temperature-sensing wax fails.

FIG. 3 shows the structure of the temperature-sensing wax type air volume regulating valve according to the embodiment of the present invention.

As shown in FIG. 3, the temperature-sensing wax type air volume regulating valve includes: an upper valve body 71, a lower valve body 72, a push rod 73, a valve disc 74, a temperature-sensing bulb 75 and a pre-compression spring 77; wherein the temperature-sensing bulb 75 passes through The sealing cover 78 is sealed at the bottom of the lower valve body 72, and the temperature sensing wax 76 is encapsulated in the temperature sensing package 75. The temperature sensing wax 76 is characterized by thermal expansion and cooling shrinkage; the upper valve body 71 is buckled on the lower valve body 72, The interior of the upper valve body 71 is divided into two cavities through the inner wall according to the air inlet direction, an opening is provided on the inner wall, the valve flap 74 is sleeved on the top of the push rod 73, and the bottom end of the push rod 73 passes downward through the inner wall. The opening is inserted into the temperature-sensitive wax 76. When the temperature-sensitive wax 76 is heated and expanded, the push rod 73 is pushed upward, and the valve flap 74 at the top of the push rod 73 opens the opening. When the temperature wax 76 cools and contracts, the valve flap 74 at the top of the push rod 73 closes the opening; a ring of bosses 731 protrudes from the middle of the push rod 73, and the pre-compression spring 77 is sleeved on the push rod 73 upper, and is limited between the boss 731 and the lower valve body 72, the pre-compression spring 77 is used to provide a downward elastic force to the push rod 73, when the temperature-sensing wax 76 is not heated to expand or push the push rod downward 3, the valve flap 74 can close the opening.

The initial expansion critical temperature of the temperature-sensing wax 76 is set to 35°C (the temperature-sensing wax 76 can be proportioned to achieve different critical temperatures according to different needs). The battery actually needs to be set), the battery management control module F controls the electric compressor A to start, because the air temperature around the branch battery 4 is 50°C (which has exceeded the initial expansion critical temperature of 35°C), the temperature-sensing wax type air volume of this branch is The regulating valve 7 has been opened before the electric compressor A is started, and cold air enters this branch. When the temperature in this area is less than or equal to 35°C, the battery management control module F controls the electric compressor A to close, because the temperature in this area drops. When the initial expansion critical temperature is 35°C, the temperature-sensitive wax type air volume regulating valve 7 of this branch is closed.

If two or more branches reach 50°C, take branches 1 and 2 as an example, the battery management control module F controls the electric compressor A to start. The temperature-sensing wax-type air volume control valves 7 of 1 and 2 are both opened, and the cold air enters branches 1 and 2 respectively. During the process, since the temperature of branch 1 is higher than that of branch 2, the opening degree of the temperature-sensing wax type air volume control valve 7 of branch 1 is larger than that of the temperature-sensing wax type air volume control valve 7 of branch 2, and the inlet air volume of branch 1 is larger than that of branch 1. The large inlet air volume of the second branch makes the cooling of branch 1 and branch 2 tend to be synchronized, avoiding the problem of slow cooling of branch 1 and rapid cooling of branch 2. When the first and second branches reach 35°C, the battery management control module F controls the electric compressor A to turn off.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field disclosed by the present invention can easily think of changes or replacements. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (2)

1. An electric vehicle power battery temperature management system, characterized in that it comprises: an electric compressor, a compressor controller, a high-voltage relay, a power battery, a battery management control module, a 12V power supply, a first ventilation duct, a second ventilation duct and battery case; of which, The interior of the battery box is divided into different sections by partitions, and both ends of each section are respectively provided with an air inlet and an air outlet, and batteries arranged in a matrix are installed in each section. A temperature sensor is arranged between; The second ventilation ducts are respectively installed in each section of the battery box, and each second ventilation duct respectively includes a second main pipeline and a second branch pipeline communicated with the second main pipeline. The outlet of the two branch pipelines is located at the front end of the first row of batteries, the second main pipeline extends out of the battery box through the air inlet, and a temperature-sensing wax type air volume adjustment is installed in the second main pipeline valve; The first ventilation duct includes a first main pipeline and a first branch pipeline in communication with the first main pipeline, the first branch pipeline is in communication with the second main pipeline, and the first main pipeline is connected with the second main pipeline. The air outlet of the electric compressor is communicated, and the air inlet of the electric compressor is communicated with the air conditioner of the automobile through an air conditioning pipeline, and a solenoid valve whose opening and closing is controlled by a solenoid valve controller is installed in the air conditioning pipeline; The battery management control module includes n sensor pins, one solenoid valve controller pin, two compressor controller pins, one high-voltage relay pin and two power supply pins; wherein, n=the temperature sensor The number of n sensor pins are respectively connected with a temperature sensor, and the two power pins are respectively connected with the positive and negative poles of the 12V power supply; The solenoid valve controller includes five pins, the first pin is connected with the solenoid valve controller pin, the second pin is connected with the positive pole of the 12V power supply, and the third pin is connected with the positive pole of the 12V power supply. The negative pole is connected, and the fourth and fifth pins are connected with the solenoid valve; The compressor controller includes nine pins, the first pin is connected to the positive pole of the 12V power supply after being connected in series with the car air conditioner switch, the first pin is connected to the negative pole of the 12V power supply, and the third and sixth pins are connected. connected with two compressor controller pins, the fifth pin is connected with the negative pole of the power battery, and the seventh to ninth pins are respectively connected with the electric compressor; The high-voltage relay includes two coil pins and two relay pins, one of which is connected to the negative pole of the 12V power supply, and the other coil pin is connected to the high-voltage relay pin; The pin is connected with the fourth pin of the compressor controller, and the relay pin is connected with the positive pole of the power battery. 2. The electric vehicle power battery temperature management system according to claim 1, wherein the temperature-sensing wax type air volume regulating valve comprises: an upper valve body, a lower valve body, a push rod, a valve disc, and a temperature sensing bag; Wherein, the temperature sensing package is sealed at the bottom of the lower valve body through a sealing cover, and the temperature sensing wax is encapsulated in the temperature sensing package; the upper valve body is buckled on the lower valve body, and the The interior of the upper valve body is divided into two cavities through the inner wall according to the air inlet direction, an opening is opened on the inner wall, the valve flap is sleeved on the top end of the push rod, and the bottom end of the push rod faces toward the top of the push rod. The valve is inserted into the temperature-sensing wax through the opening, and the valve flap at the top of the push rod opens or closes the opening; a ring of bosses protrudes from the middle of the push rod, A pre-compression spring is sleeved on the rod, and the pre-compression spring is limited between the boss and the lower valve body.