WO2019205572A1 - Method and device for determining battery pack temperature difference of new energy vehicle, and control method - Google Patents

Abstract

A method and device for determining a battery pack temperature difference of a new energy vehicle, and a control method. The method comprises: arranging multiple temperature sensors at multiple predetermined positions of a battery pack; receiving detection values respectively provided by the multiple temperature sensors, and performing first discarding processing on the detection values, the first discarding processing comprising: discarding a detection value greater than a first predetermined threshold value or less than a second predetermined threshold value; calculating a first mean value of the remaining detection values after the first discarding processing, calculating a first standard difference on the basis of the first mean value, and performing additional processing on the remaining detection values after the first discarding processing, the additional processing comprising: performing second discarding processing, i.e., discarding a detection value of which the absolute value of a difference from the first mean value is greater than a predetermined times of the first standard difference; and determining a difference between a maximum value and a minimum value in the remaining detection values after the additional processing as a temperature difference of the battery pack.

Description

Method, device and control method for determining battery pack temperature difference of new energy vehicles

Cross-reference to related applications

This application requires Beijing Great Wall Huaguan Automotive Technology Co., Ltd. to apply for the method, device and control method for determining the temperature difference of the battery pack of new energy vehicles submitted on April 24, 2018. China Patent Application No. 201810371214.8 "Priority."

Technical field

The present application relates to the field of automotive technology, and more particularly to a method, apparatus and control method for determining a battery pack temperature difference of a new energy vehicle.

Background technique

Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. Countries around the world are actively developing new energy technologies. New energy vehicles that reduce oil consumption, low pollution and low noise are considered to be important ways to solve the energy crisis and environmental degradation.

New energy vehicles refer to the use of unconventional vehicle fuels as a power source (or the use of conventional vehicle fuels, the use of new vehicle power units), integrated vehicle power control and drive advanced technology, the formation of advanced technology, with New technology, new structure of the car. New energy vehicles usually include four types, hybrid electric vehicles (HEV), pure electric vehicles (BEV), fuel cell electric vehicles (FCEV) and other new energy sources (such as supercapacitors, flywheels and other high-efficiency energy storage vehicles).

In new energy vehicles, the power battery drive motor generates power, so the performance and life of the power battery are the key factors affecting the performance of the car. Due to the limited space on the vehicle, a large amount of heat generated by the battery during operation is accumulated by the space, resulting in uneven temperature and affecting the consistency of the battery cells, thereby reducing the charging and discharging cycle efficiency of the battery and affecting the power and energy of the battery. In severe cases, it will also lead to thermal runaway, affecting the safety and reliability of the system. In order to optimize the performance and life of the power battery, it is necessary to optimize the structure of the battery pack, and use a thermal management system to keep the battery temperature in an appropriate range and ensure that the temperature of each part of the battery is balanced. The thermal management system provides cooling to the battery pack by providing coolant to each battery compartment water through the system piping.

In the prior art, temperature data is obtained everywhere by temperature sensors disposed throughout the battery pack, and based on the obtained raw temperature data, the maximum value T _max and the minimum value T _{min are} found therein, and the battery pack is obtained by subtracting them. Temperature difference. When the maximum value T _max and the minimum value T _min exceed a certain fixed threshold, the system considers that the data is incorrect and discards it to ensure the accuracy of the temperature difference calculation.

However, although the existing scheme avoids the temperature measurement error caused by the sensor failure, the error caused by the sensor itself cannot be judged, thereby reducing the accuracy of the temperature difference calculation.

Application content

The purpose of the present application is to propose a method, device and control method for determining the temperature difference of a battery of a new energy vehicle, thereby improving the accuracy of the temperature difference calculation.

Embodiments of the application include:

A method for determining a temperature difference of a battery pack of a new energy vehicle, comprising:

Arranging a plurality of temperature sensors at a plurality of predetermined locations of the battery pack;

Receiving a detection value provided by each of the plurality of temperature sensors, and performing a first discarding process on the detected value, the first discarding process comprising: discarding a value greater than a first predetermined threshold or lower than a second predetermined gate The detected value of the limit;

Calculating a first mean value of the detected values remaining after the first discarding process, calculating a first standard deviation based on the first mean value, and performing additional processing on the detected values remaining after the first discarding process, the additional processing The method includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple;

The difference between the maximum value and the minimum value among the detected values remaining after the additional processing is determined as the battery pack temperature difference.

In an embodiment, after performing the second discarding process, the additional processing further includes:

Calculating a second mean value of the detection values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and performing a third discarding process on the remaining detected values after the second discarding process The third discarding process includes: discarding the detected value of the second standard deviation whose absolute value of the difference from the second mean is greater than a predetermined multiple.

In one embodiment, the predetermined multiple is three.

A device for determining a temperature difference of a battery pack of a new energy vehicle, comprising:

a receiving module, configured to receive a detection value provided by each of a plurality of temperature sensors disposed at a plurality of predetermined positions of the battery pack, and perform a first discarding process on the detected value, where the first discarding process includes : discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold;

a calculation module, configured to calculate a first average value of the detection values remaining after the first discarding process, calculate a first standard deviation based on the first mean value, and perform additional processing on the remaining detection values after the first discarding process The additional processing includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple;

And a determining module, configured to determine a difference between a maximum value and a minimum value among the detected values remaining after the additional processing as the battery pack temperature difference.

In one embodiment, the calculating module is configured to further calculate a second mean value of the detection values remaining after the second discarding process after performing the second discarding process, and calculate a second value based on the second mean value Standard deviation, and performing a third discarding process on the detection value remaining after the second discarding process, the third discarding process comprising: discarding the absolute value of the difference from the second mean value greater than a predetermined multiple The detected value of the second standard deviation is described.

A control method for a series of thermal management pipelines for a new energy vehicle, the thermal management pipeline comprising: a water pump; a heating element, a water inlet of the heating element being connected in series with a water outlet of the water pump; a battery comprising a plurality of batteries a group comprising a first coolant interface disposed on a first side of the battery pack and a second coolant interface disposed on an opposite side of the first side, the respective water in the battery pack for heating each battery The respective pipelines of the chamber are connected in series; the reversing valve is respectively connected with the water outlet of the heating element, the water return port of the water pump, the first coolant interface and the second coolant interface; the method comprises:

Detecting a temperature difference of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values respectively provided by the plurality of temperature sensors, and performing the first time on the detected values The discarding process, the first discarding process includes: discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold; and calculating the first mean of the remaining detected values after the first discarding process, based on The first mean calculates a first standard deviation, and performs additional processing on the detected values remaining after the first discarding process, the additional processing comprising: performing an absolute value of the discarding difference from the first mean value greater than a predetermined value a second rejection processing of the detection value of the first standard deviation of the multiple; determining a difference between the maximum value and the minimum value of the detection values remaining after the additional processing as the temperature difference;

The reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold;

The reversing valve maintains a waterway direction from the first coolant interface to a second coolant interface based on the hold command, and converts a waterway direction from the second coolant interface based on the commutation command Flow to the first coolant interface.

In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold value, including:

The reversing valve controller generates the reversing command when the temperature difference is greater than the predetermined temperature difference threshold, and continuously generates a holding command within a predetermined time after the reversing command is generated.

In one embodiment, after converting the waterway direction to flow from the second coolant interface to the first coolant interface based on the commutation command, the method further includes:

The reversing valve controller generates a second reversing command when the temperature difference first decreases and then increases and when the temperature difference is greater than the predetermined temperature difference threshold;

The diverter valve converts a waterway direction from the first coolant interface to the second coolant interface based on the second commutation command.

A control method for a series of thermal management pipelines for a new energy vehicle, the thermal management pipeline comprising: a water pump; a cooling element, the water inlet of the refrigeration component is connected in series with the water outlet of the water pump; a battery pack comprising a first coolant interface disposed on a first side of the battery pack and a second coolant interface disposed on an opposite side of the first side, the battery pack for cooling each battery The respective pipelines of the respective water chambers are connected in series; the reversing valve is respectively connected to the water outlet of the refrigeration element, the water return port of the water pump, the first coolant interface and the second coolant interface; the method comprises:

Detecting a temperature difference of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving a detection value respectively provided by the plurality of temperature sensors, performing a first discarding on the detection value Processing, the first discarding process includes: discarding a detection value that is greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the remaining detection values after the first discarding process, and based on The first mean calculates a first standard deviation, and performs additional processing on the detected values remaining after the first discarding process, the additional processing comprising: performing an absolute value of the discarding difference from the first mean value greater than a predetermined value a second rejection processing of the detection value of the first standard deviation of the multiple; determining a difference between the maximum value and the minimum value of the detection values remaining after the additional processing as the temperature difference;

The reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold;

The reversing valve maintains a waterway direction from the first coolant interface to a second coolant interface based on the hold command, and converts a waterway direction from the second coolant interface based on the commutation command Flow to the first coolant interface.

In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold: when the temperature difference is greater than the predetermined temperature difference threshold, Generating a reversing valve controller to generate a reversing command, and continuously generating a holding command within a predetermined time after generating the reversing command;

After converting the waterway direction to flow from the second coolant interface to the first coolant interface based on the commutation command, the method further includes:

The reversing valve controller generates a second reversing command when the temperature difference first decreases and then increases and when the temperature difference is greater than the predetermined temperature difference threshold;

The diverter valve converts a waterway direction from the first coolant interface to the second coolant interface based on the second commutation command.

As can be seen from the above technical solution, in the embodiment of the present application, a plurality of temperature sensors are arranged at a plurality of predetermined positions of the battery pack; the detection values respectively provided by the plurality of temperature sensors are received, and the first discarded processing is performed on the detected values. The first discarding process includes: discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold; and calculating the first mean of the remaining detected values after the first discarding process, based on the first mean a first standard deviation, and performing additional processing on the detected values remaining after the first discarding process, the additional processing comprising: performing a second of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple The discarding process is performed; the difference between the maximum value and the minimum value among the detected values remaining after the additional processing is determined as the battery pack temperature difference. The statistical parameters are used to eliminate the measurement value of the sensor failure, and the correctness of the temperature difference is improved.

Moreover, the embodiment of the present application implements a pipeline scheme of the tandem thermal management system to ensure flow uniformity.

In addition, the embodiment of the present application controls the flow direction of the series water channel by using the reversing valve, thereby reducing the temperature difference of the battery system.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows.

DRAWINGS

1 is a flow chart of a method for determining a battery pack temperature difference of a new energy vehicle in accordance with the present application.

2 is a block diagram of a device for determining a battery pack temperature difference of a new energy vehicle according to the present application.

3 is a first exemplary structural diagram of a tandem thermal management system for a new energy vehicle in accordance with the present application.

4 is a schematic view of the heat management water path after the reversing operation of the reversing valve of FIG.

FIG. 5 is a schematic diagram of a first control flow of a tandem thermal management system for a new energy vehicle according to the present application.

6 is a second exemplary structural diagram of a tandem thermal management system for a new energy vehicle in accordance with the present application.

Fig. 7 is a schematic view showing the heat management water path after the reversing operation of the reversing valve of Fig. 6.

8 is a schematic diagram of a second control flow of a tandem thermal management system for a new energy vehicle according to the present application.

detailed description

The specific embodiments of the present application are described with reference to the accompanying drawings, and the same reference numerals

For the sake of brevity and clarity of description, the aspects of the present application are set forth below by describing several representative embodiments. A large number of the details in the embodiments are only used to help understand the solution of the present application. However, it is obvious that the technical solution of the present application can be implemented without being limited to these details. In order to avoid unnecessarily obscuring the aspects of the present application, some embodiments are not described in detail, but only the framework is given. Hereinafter, "including" means "including but not limited to", and "according to" means "at least according to ..., but not limited to only based on". Due to the language habit of Chinese, the number of one component is not specifically indicated below, which means that the component may be one or more, or may be understood as at least one.

The embodiment of the present application proposes a temperature difference (ie, temperature difference) calculation method that can automatically eliminate the temperature sensor error, and reduces the influence of the temperature sensor's own error on the temperature difference that the system will output. In the embodiment of the present application, the statistical error parameter is used to calculate the dynamic error limit in the current state of the system, and when the temperature sensor measurement exceeds the dynamic threshold, it is discarded, and when the temperature sensor measurement exceeds the determined threshold, the same is discarded.

1 is a flow chart of a method for determining a battery pack temperature difference of a new energy vehicle in accordance with the present application.

As shown in Figure 1, the method includes:

Step 101: Arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack.

Step 102: Receive a detection value provided by each of the plurality of temperature sensors, and perform a first discarding process on the detection value, where the first discarding process includes: discarding greater than a first predetermined threshold or lower than The detected value of the second predetermined threshold.

Step 103: Calculate a first mean value of the detection values remaining after the first discarding process, calculate a first standard deviation based on the first mean value, and perform additional processing on the detected values remaining after the first discarding process. The additional processing includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple.

Step 104: Determine a difference between a maximum value and a minimum value among the detected values remaining after the additional processing as the battery pack temperature difference.

In one embodiment, after performing the second discarding process, the additional processing further includes: calculating a second mean value of the detected values remaining after the second discarding process, and calculating the second mean value based on the second mean value a second standard deviation, and performing a third discarding process on the detection value remaining after the second discarding process, the third discarding process comprising: discarding the absolute value of the difference from the second mean value greater than a predetermined multiple The detected value of the second standard deviation. Preferably, the predetermined multiple is three.

The embodiments of the present application are described below in conjunction with specific formulas and mathematical definitions.

Assuming that there are N sensors arranged in the battery pack, the measured temperature values are: T1, T2, ... TN. Tn is used herein to refer to the measured value of any of the sensors.

Calculate the temperature difference of the battery pack by the following process:

Step 1: Discard the measured value beyond the determined threshold:

When Tn>Tb0 or Tn<Ta0, Tn is discarded; where Tb0 and Ta0 are both threshold values determined based on predetermined empirical values, wherein by comparing with Tb0 to screen out excessive temperature values, by comparing with Ta0 Screen out too small a temperature value.

Assuming that x measurements are discarded, the remaining temperature values are:

Ta1, Ta2, ..., Ta(N-x);

Step 2: Calculate the system mean μ _a after initial processing, where:

The third step: calculating the initial standard deviation σ _{a of the} system, where:

Step 4: Discard measurements that exceed 3 standard deviations:

Specifically, when

When you discard Tan, suppose you have discarded y measurements and the remaining temperature values are:

Tb1, Tb2, ..., Tb(N-x-y);

Step 5: Calculate the system mean μ _b after the secondary treatment, where:

The sixth step: the standard deviation σ _{b of the} second calculation system, and define the standard deviation of 3 times as the dynamic error limit of the system;

Step 7: Discard more than 3 standard deviations (ie

The measured value.

when

When you discard Tbn, assume that z measurements are discarded and the remaining temperature values are:

Tc1, Tc2, ..., Tc(N-x-y-z);

Step 8: Sort Tc1, Tc2, ..., Tc(Nxyz) to obtain the maximum value Tc _max and the minimum value Tc _min , and subtract the two to obtain the temperature difference ΔT of the battery pack, wherein:

ΔT = T _cmax -T _cmin

It can be seen that the embodiment of the present application uses the statistical parameter to calculate the error limit of the current state of the system, and can automatically exclude the sensor measurement value of the fault itself, and ensure the correctness of the calculated system temperature difference.

Based on the above description, the embodiment of the present application also proposes a device for determining the temperature difference of the battery of the new energy vehicle.

2 is a block diagram of a device for determining a battery pack temperature difference of a new energy vehicle according to the present application.

As shown in Figure 2, the device comprises:

The receiving module 201 is configured to receive a detection value provided by each of the plurality of temperature sensors disposed at a plurality of predetermined positions of the battery pack, and perform a first discarding process on the detected value, where the first discarding process includes: Discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold;

The calculating module 202 is configured to calculate a first mean value of the detection values remaining after the first discarding process, calculate a first standard deviation based on the first mean value, and perform an attaching on the remaining detected values after the first discarding process Processing, the additional processing includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple;

The determining module 203 is configured to determine a difference between a maximum value and a minimum value of the detected values remaining after the additional processing as the battery pack temperature difference.

In an embodiment, the calculating module 202 is configured to further calculate a second mean value of the detection values remaining after the second discarding process after performing the second discarding process, and calculate the second mean value based on the second mean value a second standard deviation, and performing a third discarding process on the detection value remaining after the second discarding process, the third discarding process comprising: discarding the absolute value of the difference from the second mean value greater than a predetermined multiple The detected value of the second standard deviation.

The method of determining the battery pack temperature difference of a new energy vehicle proposed by the embodiment of the present application can be applied to various thermal management examples.

In addition, the applicant found that the current thermal management system of new energy vehicles usually adopts a parallel cooling system, which is difficult to ensure flow uniformity, and the flow uniformity will be bent, pressed or internally fouled in the actual use. The cause was destroyed.

In addition, the applicant also found that the existing serial piping scheme has an unchangeable flow direction of the internal liquid, which results in the current battery module using the series thermal management system scheme, and the internal temperature difference is difficult to be effectively controlled, resulting in temperature difference. is too big. In extreme cases, due to the different temperatures throughout the pipeline, the thermal management system may even increase the original temperature difference of the battery system, which adversely affects the temperature uniformity of the battery system.

In the embodiment of the present application, a new energy vehicle series thermal management system is proposed to overcome the problem of flow non-uniformity of the parallel cooling system.

Moreover, in the embodiment of the present application, when the battery thermal management system needs to work, the reversing valve is used to adjust the flow direction of the pipeline according to the temperature difference between the pipelines, thereby achieving the purpose of reducing the internal temperature difference of the battery.

3 is a first exemplary structural diagram of a tandem thermal management system for a new energy vehicle in accordance with the present application.

As shown in Figure 3, the system includes:

Water pump P1;

a heating element; a water inlet of the heating element is connected in series with a water outlet of the water pump P1;

a battery pack including a plurality of batteries, comprising a first coolant interface K disposed on a first side of the battery pack and a second coolant interface M disposed on an opposite side of the first side; a battery pack for heating each battery The respective pipes of the respective water chambers are connected in series with each other (for example, in FIG. 3, the pipes of the water chamber 1, the water chamber 2 to the water chamber n are connected in series, wherein the water chamber 1 is connected to the first coolant interface K, and the water chamber n is connected. The second coolant interface M, n is the number of batteries);

The reversing valve V1 is respectively connected to the water outlet of the heating element, the water return port of the water pump P1, the first coolant interface K and the second coolant interface M;

a temperature difference detecting component for detecting a battery temperature difference between the battery on the first side of the battery pack and the battery on the opposite side;

a reversing valve controller for generating a hold command or a reversing command based on a comparison result of the battery temperature difference and the predetermined temperature difference threshold;

Wherein the reversing valve flows from the first coolant interface K to the second coolant interface M based on the hold command to maintain the water path direction, and converts the water path direction from the second coolant interface M to the first coolant based on the reversing command Interface K.

It can be seen that the battery pack of the embodiment of the present application includes a plurality of batteries, and the respective pipelines for heating each water chamber of each battery in the battery pack are connected in series with each other. Therefore, the present application implements a tandem thermal management system for a new energy vehicle, which can Overcome the problem of flow non-uniformity in parallel cooling systems.

In one embodiment, the reversing valve V1 can be implemented as an electromagnetic reversing valve, a motorized reversing valve, an electro-hydraulic reversing valve or a manual reversing valve, and the like.

Preferably, the reversing valve V1 is implemented as a two-position four-way electromagnetic reversing valve, a two-position six-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve or a three-position six-way electromagnetic reversing valve, and the like.

The above exemplarily shows a specific example of the reversing valve, and those skilled in the art will appreciate that the description is merely exemplary and is not intended to limit the scope of the embodiments of the present application.

In one embodiment, the reversing valve controller is configured to generate a hold command when the battery temperature difference is less than or equal to a predetermined temperature difference threshold, and generate a commutation command when the battery temperature difference is greater than a predetermined temperature difference threshold, and generate The hold command is continuously generated within a predetermined time after the commutation command. Therefore, by continuously generating the hold command for a predetermined time after the generation of the commutation command, the frequency switching of the reversing valve can be prevented.

Preferably, after the water direction is changed based on the commutation command to flow from the second coolant interface M to the first coolant interface K, when the battery temperature difference occurs, the battery temperature difference first decreases and then increases, and when the battery temperature difference is greater than When the temperature difference threshold is predetermined, the reversing valve controller generates a second reversing command, and the reversing valve changes the water path direction from the first coolant interface K to the second coolant interface M based on the second reversing command.

Preferably, the heating element can be embodied as a PTC heater. When the heating element is embodied as a PTC heater, the battery water path of the new energy vehicle shown in FIG. 1 includes a P1 water pump, a heating element, a reversing valve V1, a battery pack, and a pipeline, wherein the battery pack includes a plurality of batteries, and the battery pack The respective pipes for heating the respective water chambers of the respective batteries are connected in series to each other. At this point, the work process is as follows:

At the initial moment when the thermal management system is started, the water pump P1 and the PTC heater operate, while the reversing valve V1 remains in an initial state, and the thermal management system can provide heat to the battery pack. At this time, the flow sequence of the coolant is as shown in FIG. 1 , specifically: the water outlet of the water pump P1 → the PTC heater → the A port of the reversing valve V1 → the C port of the reversing valve V1 → the first coolant of the battery pack Interface K → second coolant interface M of the battery pack → D port of the reversing valve V1 → B port of the reversing valve V1 → the water return port of the water pump P1. In the configuration shown in Figure 1, the coolant is first heated in the PTC heater and then flows through the first coolant interface K of the battery pack and then through the second coolant interface M of the battery pack. That is, the battery on the first coolant interface K side of the battery pack is first heated, and then the battery on the second coolant interface M side of the battery pack is heated. After heating for a period of time, due to the non-uniformity of the internal temperature of the series pipeline, temperature unevenness also appears inside the battery pack, which is characterized by high temperature near the water inlet of the battery pack and low temperature near the water outlet, that is, the first coolant interface The battery temperature on the K side is relatively high, and the battery temperature on the side of the second coolant interface M is relatively low.

The temperature difference detecting element continuously detects the battery temperature difference in the battery pack. Among them, the battery temperature difference can be understood as an absolute value. When the battery temperature difference (referred to as the temperature difference) detected by the temperature difference detecting element is less than or equal to the predetermined threshold value a, the switching valve controller generates a hold command, at which time the reversing valve does not perform the reversing operation. When the temperature difference detected by the temperature difference detecting element is greater than the predetermined threshold value a, the reversing valve controller generates a reversing command to reverse the reversing valve V1 to exchange the battery inlet and outlet ports.

The specific process of the temperature difference detecting component continuously detecting the battery temperature difference in the battery pack includes: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving the detection values respectively provided by the plurality of temperature sensors, and performing the detected values on the detected values For the first discarding process, the first discarding process includes: discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold; and calculating the first mean of the remaining detected values after the first discarding process, Calculating a first standard deviation based on the first mean value, and performing additional processing on the detected value remaining after the first discarding process, the additional processing comprising: performing an absolute value of the difference between the discarding and the first mean value being greater than And a second rejection processing of the detection value of the first standard deviation of the predetermined multiple; the difference between the maximum value and the minimum value among the detection values remaining after the additional processing is determined as the temperature difference. Preferably, after performing the second discarding process, the additional processing further includes: calculating a second mean value of the detected values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and Performing a third discarding process on the detected values remaining after the second discarding process, the third discarding process comprising: discarding the second criterion that the absolute value of the difference from the second mean is greater than a predetermined multiple Poor detection value.

4 is a schematic view of the heat management water path after the reversing operation of the reversing valve of FIG.

It can be seen from Fig. 4 that after the commutation operation is performed, the flow order of the coolant is adjusted to: the water outlet of the water pump P1 → the heating element (such as a PTC heater) → the A port of the reversing valve V1 → the D of the reversing valve V1 Port→The second coolant interface M of the battery pack→the first coolant port K of the battery pack→the C port of the reversing valve V1→the B port of the reversing valve V1→the water return port of the water pump P1. At this time, the coolant is first heated in the PTC heater, then flows through the second coolant interface M of the battery pack, and then flows through the first coolant interface K of the battery pack. That is, the battery on the second coolant interface M side of the battery pack is first heated, and then the battery on the side of the first coolant interface K of the battery pack is heated. After heating for a period of time, due to the non-uniformity of the internal temperature of the series pipeline, after such a period of operation, the temperature difference of the battery inside the battery pack will be reduced (ie, the temperature of the battery on the side of the first coolant interface K and the second coolant interface) The battery temperature on the M side is gradually approaching), and the state shown in Fig. 4 is maintained to continue. Then, the temperature difference will become zero, that is, the battery temperature on the first coolant interface K side is the same as the battery temperature on the second coolant interface M side, and at this time, the state continues to operate, and the temperature difference will increase from zero (the first The temperature of the battery on the side of the coolant interface M gradually starts to be greater than the temperature of the battery on the side of the first coolant interface M. When the temperature difference reaches a certain threshold value a, the commutation operation is performed again, so that the thermal management system is turned off. .

Based on the above description, the embodiment of the present application proposes a control method for a series-type thermal management pipeline of a new energy vehicle. The heat management pipeline includes: a water pump; a heating element, a water inlet of the heating element is connected in series with a water outlet of the water pump; a battery pack including a plurality of batteries, including a first coolant interface disposed on the first side of the battery pack and disposed at the first a second coolant interface on the opposite side of one side, the respective tubes of the water cells in the battery pack for heating each battery are connected in series; the reversing valve, the water outlet of the heating element, the water return of the water pump, the first cooling The liquid interface and the second coolant interface are respectively connected; the method comprises:

The first step: the temperature difference detecting element detects the battery temperature difference of the battery pack. For the specific detection method, refer to the method flow shown in FIG.

The second step: the reversing valve controller generates a hold command or a reversing command based on a comparison result between the battery temperature difference and the predetermined temperature difference threshold;

The third step: the reversing valve keeps the water flow direction from the first coolant interface to the second coolant interface based on the hold command, and converts the water path direction from the second coolant interface to the first coolant based on the commutation command interface.

In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison result of the battery temperature difference and the predetermined temperature difference threshold value, including: when the battery temperature difference is less than or equal to the predetermined temperature difference threshold, the reversing valve control The generator generates a hold command.

In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison of the battery temperature difference and the predetermined temperature difference threshold: the reversing valve when the battery temperature difference is greater than the predetermined temperature difference threshold The controller generates a commutation command and continuously generates a hold command within a predetermined time after the commutation command is generated.

In one embodiment, after converting the waterway direction to flow from the second coolant interface to the first coolant interface based on the commutation command, the method further includes: when the battery temperature difference occurs, first decreasing and then increasing the change The reversing valve controller generates a second reversing command when the battery temperature difference is again greater than the predetermined temperature difference threshold; the reversing valve changes the water direction to flow from the first coolant interface to the first based on the second reversing command Two coolant interface.

FIG. 5 is a schematic diagram of a first control flow of a tandem thermal management system for a new energy vehicle according to the present application.

The flow shown in FIG. 5 can be applied to the switching process shown in FIGS. 3 and 4. The heating element can be embodied as a PTC heater.

As shown in FIG. 5, the method includes:

Step 501: Detect the temperature T of the battery pack, for example, the temperature T may be the average temperature of the battery pack.

Step 502: When the temperature T of the battery pack is greater than the predetermined threshold A, it may be determined that the heat treatment is not required for the battery pack, and step 508 and subsequent steps are performed; when the temperature T of the battery pack is less than the predetermined threshold At time A, it can be determined that the heat treatment needs to be performed for the battery pack, and at this time, step 503 and subsequent steps are performed.

Step 503: Turn on the water pump P1 and start the PTC heater. At this time, the water pump P1 and the PTC heater operate, while the reversing valve V1 maintains the initial state, and the thermal management system can supply heat to the battery pack. At this time, the flow order of the cooling liquid is the water outlet of the water pump P1 → the PTC heater → the A port of the reversing valve V1 → the C port of the reversing valve V1 → the first coolant interface K of the battery pack → the second of the battery pack The coolant port M → the D port of the reversing valve V1 → the B port of the reversing valve V1 → the water return port of the water pump P1. The coolant is first heated in the PTC heater and then flows through the first coolant interface K of the battery pack and then through the second coolant interface M of the battery pack. That is, the first coolant interface K side battery of the battery pack is first heated, and then the battery of the second coolant interface M side of the battery pack is heated. After heating for a period of time, due to the non-uniformity of the internal temperature of the series pipeline, temperature unevenness also appears inside the battery pack, which is characterized by high temperature near the water inlet of the battery pack and low temperature near the water outlet, that is, the first coolant interface The battery temperature on the K side is high, and the battery temperature on the second coolant interface M side is low.

Step 504: The temperature difference detecting element continuously detects the battery temperature difference dT of the battery pack (for example, detecting a battery temperature difference between the battery closest to the first coolant interface K and the battery detecting the closest to the second coolant interface). Among them, the battery temperature difference dT is understood to be an absolute value. The specific temperature difference detecting method of the temperature difference detecting element can be referred to the flow shown in FIG.

Step 505: When the temperature difference dT detected by the temperature difference detecting element is less than the predetermined threshold value B, the switching valve controller generates a hold command, and performs step 507: when the temperature difference dT detected by the temperature difference detecting element is greater than or equal to a predetermined value When the threshold value a, the reversing valve controller generates a reversing command, and performs step 506;

Step 506: The reversing valve V1 is reversing based on the reversing command, so that the battery inlet and outlet ports are interchanged. That is, the flow order of the cooling liquid is the water outlet of the water pump P1 → the PTC heater → the A port of the reversing valve V1 → the D port of the reversing valve V1 → the second coolant interface M of the battery pack → the first cooling of the battery pack Liquid interface K → C port of the reversing valve V1 → B port of the reversing valve V1 → water return port of the water pump P1. Then, return to step 501.

Step 507: The reversing valve V1 does not perform the reversing operation based on the hold command, and maintains the V1 direction, that is, the flow order of the coolant is still the water outlet of the water pump P1 → the PTC heater → the A port of the reversing valve V1 → the reversing valve V1 Port C → the first coolant interface K of the battery pack → the second coolant interface M of the battery pack → the D port of the reversing valve V1 → the B port of the reversing valve V1 → the return port of the water pump P1. Then, return to step 501.

Step 508: Turn off the PTC, turn off the water pump P1, and return to step 501.

Based on the above description, the present application also proposes a control device for a tandem thermal management pipeline of a new energy vehicle. The heat management pipeline includes: a water pump; a heating element, a water inlet of the heating element is connected in series with the water outlet of the water pump; and a battery pack including a plurality of batteries, including a first coolant interface disposed on the first side of the battery pack And a second coolant interface disposed on an opposite side of the first side, the respective tubes of the battery pack for heating respective water chambers of the respective batteries are connected in series; the reversing valve, and the outlet of the heating element a nozzle, a water return port of the water pump, a first coolant interface, and a second coolant interface are respectively connected; the control device includes: a temperature difference detecting component, configured to detect a battery and a location on the first side of the battery pack a battery temperature difference between the batteries on the opposite side; a reversing valve controller for generating a hold command or a reversing command based on a comparison result of the battery temperature difference and a predetermined temperature difference threshold; wherein the reversing valve is based on The hold command maintains a water path direction from the first coolant interface to a second coolant interface, and converts a waterway direction to flow from the second coolant interface based on the commutation command A cooling fluid interface.

It should be noted that Figures 3 and 4 are only one typical configuration of the present application, and all solutions in which a series waterway plus a reversing valve are considered to be included in the application embodiment. Moreover, the working conditions shown in Figures 31 and 4 are only a typical working condition, all of which are connected in series with a reversing valve, and regardless of whether the thermal management system has heating, cooling, or only liquid circulation function, it should be It is considered to be included in the application implementation.

6 is a second exemplary structural diagram of a tandem thermal management system for a new energy vehicle in accordance with the present application.

As shown in Figure 6, the system includes:

Water pump P1;

a cooling element; a water inlet of the cooling element is connected in series with a water outlet of the water pump P1;

a battery pack including a plurality of batteries, including a first coolant interface K disposed on a first side of the battery pack and a second coolant interface M disposed on an opposite side of the first side; a battery pack for cooling each battery The respective pipes of the respective water chambers are connected in series with each other (for example, in FIG. 4, the pipes of the water chamber 1, the water chamber 2 to the water chamber n are connected in series, wherein the water chamber 1 is connected to the first coolant interface K, and the water chamber n is connected. The second coolant interface M, n is the number of batteries);

The reversing valve V1 is respectively connected to the water outlet of the cooling element, the water return port of the water pump P1, the first coolant interface K and the second coolant interface M;

a temperature difference detecting component for detecting a battery temperature difference between the battery on the first side of the battery pack and the battery on the opposite side;

a reversing valve controller for generating a hold command or a reversing command based on a comparison result of the battery temperature difference and the predetermined temperature difference threshold;

Wherein the reversing valve flows from the first coolant interface K to the second coolant interface M based on the hold command to maintain the water path direction, and converts the water path direction from the second coolant interface M to the first coolant based on the reversing command Interface K.

It can be seen that the battery pack of the embodiment of the present application includes a plurality of batteries, and the respective pipelines for cooling each water chamber of each battery in the battery pack are connected in series with each other. Therefore, the present application implements a tandem thermal management system for a new energy vehicle, which can Overcome the problem of flow non-uniformity in parallel cooling systems.

In one embodiment, the reversing valve V1 can be implemented as an electromagnetic reversing valve, a motorized reversing valve, an electro-hydraulic reversing valve or a manual reversing valve, and the like. Preferably, the reversing valve V1 is implemented as a two-position four-way electromagnetic reversing valve, a two-position six-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve or a three-position six-way electromagnetic reversing valve, and the like.

The above exemplarily shows a specific example of the reversing valve, and those skilled in the art will appreciate that the description is merely exemplary and is not intended to limit the scope of the embodiments of the present application.

In one embodiment, the reversing valve controller is configured to generate a hold command when the battery temperature difference is less than or equal to a predetermined temperature difference threshold, and generate a commutation command when the battery temperature difference is greater than a predetermined temperature difference threshold, and generate The hold command is continuously generated within a predetermined time after the commutation command.

Therefore, by continuously generating the hold command for a predetermined time after the generation of the commutation command, the frequency switching of the reversing valve can be prevented.

Preferably, the refrigeration element can be embodied as a chiller. When the heating element is embodied as a chiller, the battery water path of the new energy vehicle shown in FIG. 4 includes a P1 water pump, a chiller, a reversing valve V1, a battery pack, and a pipeline, wherein the battery pack includes a plurality of batteries, and the battery pack The respective pipes for cooling the respective water chambers of the respective batteries are connected in series to each other. At this point, the work process is as follows:

At the initial moment when the thermal management system is started, the water pump P1 and the chiller operate, while the reversing valve V1 maintains the initial state, and the thermal management system can supply the refrigerant to the battery pack. At this time, the flow sequence of the coolant is as shown in FIG. 4, specifically: the water outlet of the water pump P1 → the chiller → the port A of the reversing valve V1 → the C port of the reversing valve V1 → the first coolant interface of the battery pack K → the second coolant interface M of the battery pack → the D port of the reversing valve V1 → the B port of the reversing valve V1 → the water return port of the water pump P1. At this time, the coolant is first cooled in the chiller, and then flows through the first coolant interface K of the battery pack and then through the second coolant interface M of the battery pack. That is, the first coolant interface K side battery of the battery pack is first cooled, and then the battery on the second coolant interface M side of the battery pack is cooled. After a period of cooling, due to the non-uniformity of the internal temperature of the series pipeline, temperature unevenness also appears inside the battery pack, which is characterized by low temperature near the water inlet of the battery pack and high temperature near the water outlet, that is, the first coolant interface The battery temperature on the K side is relatively low, and the battery temperature on the side of the second coolant interface M is relatively high.

The temperature difference detecting element continuously detects a battery temperature difference of the battery pack (for example, detecting a battery temperature difference between the battery closest to the first coolant interface K and the battery closest to the second coolant interface). Among them, the battery temperature difference can be understood as an absolute value. Specifically, the process of continuously detecting the battery temperature difference of the battery pack by the temperature difference detecting component includes: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values respectively provided by the plurality of temperature sensors, and detecting the detected values Performing a first discarding process, the first discarding process includes: discarding a detection value that is greater than a first predetermined threshold value or lower than a second predetermined threshold value; and calculating a number of detection values remaining after the first discarding process a mean value, and calculating a first standard deviation based on the first mean value, and performing additional processing on the detected value remaining after the first discarding process, the additional processing comprising: performing a discarding difference from the first mean value The second discarding process of the detected value of the first standard deviation whose absolute value is greater than a predetermined multiple; the difference between the maximum value and the minimum value among the detected values remaining after the additional processing is determined as the temperature difference.

When the battery temperature difference (referred to as the temperature difference) detected by the temperature difference detecting element is less than or equal to the predetermined threshold value a, the switching valve controller generates a hold command, at which time the reversing valve does not perform the reversing operation. When the temperature difference detected by the temperature difference detecting element is greater than the predetermined threshold value a, the reversing valve controller generates a reversing command to reverse the reversing valve V1 to exchange the battery inlet and outlet ports.

Fig. 7 is a schematic view showing the heat management water path after the reversing operation of the reversing valve of Fig. 6.

It can be seen from Fig. 7 that after the commutation operation is performed, the flow order of the coolant is adjusted to: the water outlet of the water pump P1 → the chiller → the port A of the reversing valve V1 → the D port of the reversing valve V1 → the battery pack The second coolant interface M→the first coolant interface K of the battery pack→the C port of the reversing valve V1→the B port of the reversing valve V1→the water return port of the water pump P1. At this time, the coolant is first cooled in the chiller, then flows through the second coolant interface M of the battery pack, and then flows through the first coolant interface K of the battery pack. That is, the battery on the second coolant interface M side of the battery pack is first cooled, and then the battery on the side of the first coolant interface K of the battery pack is cooled. After a period of cooling, due to the non-uniformity of the internal temperature of the series pipeline, after such a period of operation, the battery temperature difference inside the battery pack will be reduced (ie, the battery temperature on the K side of the first coolant interface and the second coolant interface) The battery temperature on the M side is gradually approaching), and this state continues to run. Then the temperature difference will become zero, that is, the battery temperature on the first coolant interface K side is the same as the battery temperature on the second coolant interface M side, and at this time, the state continues to operate, and the temperature difference will increase from zero (second The battery temperature on the coolant interface M side gradually starts to be lower than the battery temperature on the first coolant interface M side. When the temperature difference reaches a certain threshold value a, the commutation operation is performed again, so that the thermal management system is turned off. .

Based on the above description, the present application also proposes a control method for a series of thermal management pipelines for new energy vehicles. The heat management pipeline includes: a water pump; a cooling element, a water inlet of the cooling element is connected in series with a water outlet of the water pump; and a battery pack including a plurality of batteries, including a first side disposed on the battery pack a first coolant interface and a second coolant interface disposed on an opposite side of the first side, wherein each of the tubes of the battery pack for cooling each water chamber of each battery is connected in series; a reversing valve, and The water outlet of the refrigeration element, the water return port of the water pump, the first coolant interface and the second coolant interface are respectively connected; the method comprises:

The first step: the temperature difference detecting component detects the battery temperature difference of the battery pack, and the specific method can refer to the method flow shown in FIG.

The second step: the reversing valve controller generates a hold command or a reversing command based on a comparison result of the battery temperature difference and the predetermined temperature difference threshold.

The third step: the reversing valve maintains the water path direction from the first coolant interface to the second coolant interface based on the hold command, and converts the water path direction from the first based on the commutation command The second coolant interface flows to the first coolant interface.

In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison result of the battery temperature difference and a predetermined temperature difference threshold value: when the battery temperature difference is less than or equal to the predetermined temperature difference gate The limit valve controller generates a hold command when the limit is reached. In one embodiment, the reversing valve controller generates a hold command or a reversing command based on a comparison result of the battery temperature difference and a predetermined temperature difference threshold value: when the battery temperature difference is greater than the predetermined temperature difference threshold At the time of the value, the reversing valve controller generates a reversing command and continuously generates a holding command for a predetermined time after the reversing command is generated.

In one embodiment, after converting the waterway direction to flow from the second coolant interface to the first coolant interface based on the commutation command, the method further comprises: first decreasing when the battery temperature difference occurs a further change and when the battery temperature difference is again greater than the predetermined temperature difference threshold, the reversing valve controller generates a second commutation command; the reversing valve is based on the second reversing command The water path direction is changed to flow from the first coolant interface to the second coolant interface.

8 is a schematic diagram of a second control flow of a tandem thermal management system for a new energy vehicle according to the present application.

The flow shown in FIG. 8 can be applied to the switching process shown in FIGS. 6 and 7. At this time, the refrigeration element can be embodied as a chiller.

As shown in Figure 8, the method includes:

Step 801: Detect the temperature T of the battery pack, for example, the temperature T may be the average temperature of the battery pack.

Step 802: When the temperature T of the battery pack is less than the predetermined threshold A, it may be determined that the cooling process is not required to be performed for the battery pack. At this time, step 808 is performed; when the temperature T of the battery pack is greater than or equal to the predetermined threshold A, It is determined that the cooling process needs to be performed for the battery pack, and step 803 and its subsequent steps are performed at this time.

Step 803: Turn on the water pump P1 and start the chiller. At this time, the water pump P1 and the chiller operate, while the reversing valve V1 maintains the initial state, and the thermal management system can supply the refrigerant to the battery pack. At this time, the flow order of the coolant is the water outlet of the water pump P1 → the chiller → the port A of the reversing valve V1 → the C port of the reversing valve V1 → the first coolant interface K of the battery pack → the second cooling of the battery pack Liquid interface M → D port of the reversing valve V1 → B port of the reversing valve V1 → water return port of the water pump P1. At this time, the coolant is first cooled in the chiller, and then flows through the first coolant interface K of the battery pack and then through the second coolant interface M of the battery pack. That is, the first coolant interface K side battery of the battery pack is first cooled, and then the battery on the second coolant interface M side of the battery pack is cooled. After a period of cooling, due to the non-uniformity of the internal temperature of the series pipeline, temperature unevenness also appears inside the battery pack, which is characterized by low temperature near the water inlet of the battery pack and high temperature near the water outlet, that is, the first coolant interface The battery temperature on the K side is low, and the battery temperature on the second coolant interface M side is high.

Step 804: The temperature difference detecting element continuously detects the temperature difference dT of the battery pack (for example, detecting a battery temperature difference between the battery closest to the first coolant interface K and the battery detecting the closest to the second coolant interface). Among them, the temperature difference can be understood as an absolute value.

Step 805: When the temperature difference dT detected by the temperature difference detecting element is less than the predetermined threshold value B, the switching valve controller generates a hold command, and performs step 807: when the temperature difference dT detected by the temperature difference detecting element is greater than or equal to a predetermined value When the threshold value a, the reversing valve controller generates a reversing command, and performs step 806;

Step 806: The reversing valve reversing command reverses the reversing valve V1 to exchange the battery inlet and outlet ports. That is, the flow order of the coolant is the water outlet of the water pump P1 → the chiller → the port A of the reversing valve V1 → the D port of the reversing valve V1 → the second coolant interface M of the battery pack → the first coolant of the battery pack Interface K → C port of the reversing valve V1 → B port of the reversing valve V1 → water return port of the water pump P1. Then, return to step 801.

Step 807: The reversing valve does not perform the reversing operation based on the hold command, and maintains the V1 direction, that is, the flow order of the coolant is still the water outlet of the water pump P1 → the chiller → the port A of the reversing valve V1 → the C of the reversing valve V1 Port→The first coolant interface K of the battery pack→the second coolant interface M of the battery pack→the D port of the reversing valve V1→the B port of the reversing valve V1→the water return port of the water pump P1. Then, return to step 601.

Step 808: Turn off the chiller, turn off the water pump P1, and return to step 801.

Based on the above description, the embodiment of the present application also proposes a control device for a series-type thermal management pipeline of a new energy vehicle. The heat management pipeline includes: a water pump; a cooling element, a water inlet of the cooling element is connected in series with a water outlet of the water pump; and a battery pack including a plurality of batteries, including a first side disposed on the first side of the battery pack a coolant interface and a second coolant interface disposed on an opposite side of the first side, wherein respective tubes of the battery pack for cooling respective water chambers of the respective batteries are connected in series; a reversing valve, and the a water outlet of the refrigeration element, a water return port of the water pump, a first coolant interface, and a second coolant interface are respectively connected; the device includes: a temperature difference detecting component, configured to detect the first side of the battery pack a battery temperature difference between the battery and the battery on the opposite side; a reversing valve controller for generating a hold command or a reversing command based on a comparison result of the battery temperature difference and a predetermined temperature difference threshold; Reversing valve maintains a waterway direction from the first coolant interface to a second coolant interface based on the hold command, and converts a waterway direction to flow from the second coolant interface based on the commutation command To the first coolant interface.

It should be noted that Figures 6 and 7 are only one typical configuration of the present application, and all solutions in which a series waterway plus a reversing valve are considered to be included in the application embodiment. Moreover, the working conditions shown in Figures 6 and 7 are only a typical working condition, all of which are connected in series with a reversing valve, and regardless of whether the thermal management system has heating, cooling, or only liquid circulation function, it should be It is considered to be included in the application implementation.

The tandem thermal management system proposed by the embodiment of the present application can be applied to various new energy vehicles, such as hybrid electric vehicles (HEV), pure electric vehicles (BEV), fuel cell electric vehicles (FCEV), and other new energy sources ( Such as supercapacitors, flywheels and other high-efficiency energy storage devices) cars.

In summary, in the embodiment of the present application, a plurality of temperature sensors are disposed at a plurality of predetermined positions of the battery pack; receiving detection values respectively provided by the plurality of temperature sensors, and performing a first discarding process on the detected values, first The sub-disposal process includes: discarding the detection value that is greater than the first predetermined threshold value or lower than the second predetermined threshold value; calculating a first mean value of the remaining detection values after the first discarding process, and calculating the first criterion based on the first mean value Poor, and performing additional processing on the detected values remaining after the first discarding process, the additional processing includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple The difference between the maximum value and the minimum value among the detection values remaining after the additional processing is determined as the battery pack temperature difference. The statistical parameters are used to eliminate the measurement value of the sensor failure, and the correctness of the temperature difference is improved.

Moreover, the embodiment of the present application implements a pipeline scheme of the tandem thermal management system to ensure flow uniformity.

In addition, the embodiment of the present application controls the flow direction of the series water channel by using the reversing valve, thereby reducing the temperature difference of the battery system.

The detailed descriptions set forth above are merely illustrative of the possible embodiments of the present application, and are not intended to limit the scope of the application, Changes, such as combinations, divisions, or repetitions of features, are intended to be included within the scope of the present application.

Claims (10)

1. A method for determining a temperature difference of a battery pack of a new energy vehicle, comprising:

   Arranging a plurality of temperature sensors at a plurality of predetermined locations of the battery pack;

   Receiving a detection value provided by each of the plurality of temperature sensors, and performing a first discarding process on the detected value, the first discarding process comprising: discarding a value greater than a first predetermined threshold or lower than a second predetermined gate The detected value of the limit;

   Calculating a first mean value of the detected values remaining after the first discarding process, calculating a first standard deviation based on the first mean value, and performing additional processing on the detected values remaining after the first discarding process, the additional processing The method includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple;

   The difference between the maximum value and the minimum value among the detected values remaining after the additional processing is determined as the battery pack temperature difference.
2. The method for determining a temperature difference of a battery of a new energy vehicle according to claim 1, wherein after the performing the second discarding process, the additional processing further comprises:

   Calculating a second mean value of the detection values remaining after the second discarding process, calculating a second standard deviation based on the second mean value, and performing a third discarding process on the remaining detected values after the second discarding process The third discarding process includes: discarding the detected value of the second standard deviation whose absolute value of the difference from the second mean is greater than a predetermined multiple.
3. The method of determining a temperature difference of a battery pack of a new energy vehicle according to claim 1 or 2, wherein said predetermined multiple is three.
4. A device for determining a temperature difference of a battery of a new energy vehicle, comprising:

   a receiving module, configured to receive a detection value provided by each of a plurality of temperature sensors disposed at a plurality of predetermined positions of the battery pack, and perform a first discarding process on the detected value, where the first discarding process includes : discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold;

   a calculation module, configured to calculate a first average value of the detection values remaining after the first discarding process, calculate a first standard deviation based on the first mean value, and perform additional processing on the remaining detection values after the first discarding process The additional processing includes: performing a second discarding process of discarding the detected value of the first standard deviation whose absolute value of the difference from the first mean is greater than a predetermined multiple;

   And a determining module, configured to determine a difference between a maximum value and a minimum value among the detected values remaining after the additional processing as the battery pack temperature difference.
5. The apparatus for determining a temperature difference of a battery pack of a new energy vehicle according to claim 4, wherein

   a calculation module, configured to further calculate a second mean value of the detection values remaining after the second discarding process after performing the second discarding process, calculate a second standard deviation based on the second mean value, and calculate a second standard deviation The detection value remaining after the second discarding process performs a third discarding process, and the third discarding process includes: discarding the second standard deviation of the difference between the absolute value of the difference with the second mean greater than a predetermined multiple Detected value.
6. A method for controlling a tandem heat management pipeline of a new energy vehicle, characterized in that the heat management pipeline comprises: a water pump; a heating element, the water inlet of the heating element is connected in series with the water outlet of the water pump; a battery pack of a battery, comprising a first coolant interface disposed on a first side of the battery pack and a second coolant interface disposed on an opposite side of the first side, the battery pack for heating each The respective pipelines of each water chamber of the battery are connected in series; the reversing valve is respectively connected to the water outlet of the heating element, the water return port of the water pump, the first coolant interface and the second coolant interface; the method comprises:

   Detecting a temperature difference of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values respectively provided by the plurality of temperature sensors, and performing the first time on the detected values The discarding process, the first discarding process includes: discarding the detected value that is greater than the first predetermined threshold or lower than the second predetermined threshold; and calculating the first mean of the remaining detected values after the first discarding process, based on The first mean calculates a first standard deviation, and performs additional processing on the detected values remaining after the first discarding process, the additional processing comprising: performing an absolute value of the discarding difference from the first mean value greater than a predetermined value a second rejection processing of the detection value of the first standard deviation of the multiple; determining a difference between the maximum value and the minimum value of the detection values remaining after the additional processing as the temperature difference;

   The reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold;

   The reversing valve maintains a waterway direction from the first coolant interface to a second coolant interface based on the hold command, and converts a waterway direction from the second coolant interface based on the commutation command Flow to the first coolant interface.
7. The method for controlling a tandem thermal management pipeline of a new energy vehicle according to claim 6, wherein the reversing valve controller generates a hold command or a commutation based on a comparison result of the temperature difference and a predetermined temperature difference threshold value. The commands include:

   The reversing valve controller generates the reversing command when the temperature difference is greater than the predetermined temperature difference threshold, and continuously generates a holding command within a predetermined time after the reversing command is generated.
8. The method for controlling a tandem thermal management pipeline of a new energy vehicle according to claim 7, wherein the waterway direction is changed to flow from the second coolant interface to the first coolant based on the commutation command After the interface, the method further includes:

   The reversing valve controller generates a second reversing command when the temperature difference first decreases and then increases and when the temperature difference is greater than the predetermined temperature difference threshold;

   The diverter valve converts a waterway direction from the first coolant interface to the second coolant interface based on the second commutation command.
9. A control method for a series of thermal management pipelines for a new energy vehicle, characterized in that: the heat management pipeline comprises: a water pump; a cooling element, wherein a water inlet of the refrigeration component is connected in series with a water outlet of the water pump; a battery pack including a plurality of batteries, including a first coolant interface disposed on a first side of the battery pack and a second coolant interface disposed on an opposite side of the first side, the battery pack being used in Cooling each tube of each water chamber of each battery in series; the reversing valve is respectively connected with the water outlet of the cooling element, the water return port of the water pump, the first coolant interface and the second coolant interface; Methods include:

   Detecting a temperature difference of the battery pack, comprising: arranging a plurality of temperature sensors at a plurality of predetermined positions of the battery pack; receiving detection values respectively provided by the plurality of temperature sensors, performing a first discarding on the detected values Processing, the first discarding process includes: discarding a detection value that is greater than a first predetermined threshold value or lower than a second predetermined threshold value; calculating a first mean value of the remaining detection values after the first discarding process, and based on The first mean calculates a first standard deviation, and performs additional processing on the detected values remaining after the first discarding process, the additional processing comprising: performing an absolute value of the discarding difference from the first mean value greater than a predetermined value a second rejection processing of the detection value of the first standard deviation of the multiple; determining a difference between the maximum value and the minimum value of the detection values remaining after the additional processing as the temperature difference;

   The reversing valve controller generates a hold command or a reversing command based on a comparison result of the temperature difference and a predetermined temperature difference threshold;

   The reversing valve maintains a waterway direction from the first coolant interface to a second coolant interface based on the hold command, and converts a waterway direction from the second coolant interface based on the commutation command Flow to the first coolant interface.
10. The control method for a series-type thermal management pipeline of a new energy vehicle according to claim 9, wherein the reversing valve controller generates a hold command or a commutation based on a comparison result of the temperature difference and a predetermined temperature difference threshold value. The command includes: when the temperature difference is greater than the predetermined temperature difference threshold, the reversing valve controller generates a reversing command, and continuously generates a holding command within a predetermined time after generating the reversing command;

    After converting the waterway direction to flow from the second coolant interface to the first coolant interface based on the commutation command, the method further includes:

    The reversing valve controller generates a second reversing command when the temperature difference first decreases and then increases and when the temperature difference is greater than the predetermined temperature difference threshold;

    The diverter valve converts a waterway direction from the first coolant interface to the second coolant interface based on the second commutation command.

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