CN115020848A - Method and device for determining position of battery pack temperature sensor and electronic equipment - Google Patents

Abstract

The invention provides a method and a device for determining the position of a temperature sensor of a battery pack and electronic equipment, which relate to the technical field of battery pack design and comprise the following steps: determining a temperature verification position of the battery pack according to the predicted temperature high point and the predicted temperature low point of the battery pack; if the first temperature corresponding to the temperature verification position does not exist under the high-temperature working condition is higher than the second temperature and is higher than a first temperature threshold partially, and the first temperature corresponding to the temperature verification position does not exist under the low-temperature working condition is lower than the second temperature and is lower than the second temperature threshold partially, the arrangement position of the temperature sensors is determined based on the preset position of the temperature sensors; through determining the accurate position of the sensor that can gather the battery package at the highest temperature of high temperature operating mode and the minimum temperature of low temperature operating mode, and then solve the relatively poor technical problem of use fail safe nature of battery package.

Description

Method, device and electronic device for determining position of battery pack temperature sensor

technical field

The present invention relates to the technical field of battery pack design, and in particular, to a method, device and electronic device for determining the position of a battery pack temperature sensor.

Background technique

The battery module is an important part of the battery pack. Generally, each module is equipped with two temperature sensors, so as to accurately collect the maximum and minimum temperatures during the application of the battery pack, and then perform corresponding thermal management or charging. Discharge control.

However, in the actual application process, the temperature collected by the two temperature sensors set by the battery module may not be the minimum temperature or the maximum temperature of the battery pack. Therefore, the thermal management or charge-discharge control strategy executed based on the collected temperature at this time may not be used. The reliability is not high, which affects the safety of the battery pack.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a method, device and electronic device for determining the position of a battery pack temperature sensor, by determining a sensor that can collect the highest temperature of the battery pack in high temperature conditions and the lowest temperature in low temperature conditions Accurate position, and then solve the technical problem of poor safety and reliability of battery pack use.

In a first aspect, the embodiments provide a method for determining the location of a battery pack temperature sensor, the method comprising:

Determine the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack;

In the case of the high temperature working condition and the low temperature working condition of the battery pack, respectively comparing the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor;

If the first temperature corresponding to the temperature verification position is not higher than the second temperature and partially exceeds the first temperature threshold under high temperature conditions, and there is no temperature verification position corresponding to the temperature verification position under low temperature conditions The first temperature of the temperature sensor is lower than the second temperature and the lower part exceeds the second temperature threshold, then the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor.

In an optional embodiment, the method further includes:

If the first temperature corresponding to the temperature verification position is higher than the second temperature and partially exceeds the first temperature threshold under high temperature conditions, or, under low temperature conditions, there is a first temperature corresponding to the temperature verification position When a temperature is lower than the second temperature and partially exceeds the second temperature threshold, the preset position of the temperature sensor is adjusted, and the first temperature corresponding to the temperature verification position is compared with the adjusted preset position of the temperature sensor The third temperature is compared until the arrangement position of the temperature sensor is determined.

In an optional embodiment, the step of adjusting the preset position of the temperature sensor includes:

If the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part is larger than the first temperature threshold under the high temperature condition, it is determined that under the high temperature condition, the temperature acquisition of the temperature sensor is affected. key components of the battery pack; redesign, re-selection or adjustment of the key components in the battery pack;

If the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part is greater than the second temperature threshold under the low temperature condition, it is determined that under the low temperature condition, the temperature acquisition of the temperature sensor is affected. Key components of the battery pack; redesign, remodel or adjust the key components in the battery pack.

In an optional embodiment, the step of adjusting the preset position of the temperature sensor further includes:

Replace the positive and negative electrodes of each module in the battery pack;

or,

If there is a temperature verification location that is higher than the second temperature and partly higher than the first temperature threshold under high temperature conditions, or if there is a temperature verification position lower than the second temperature and lower than the first temperature threshold under low temperature conditions For the temperature verification position of the second temperature threshold, the preset position of the temperature sensor of the target module is symmetrically adjusted with the center position of the target module where the preset position of the temperature sensor with abnormal temperature is located as a reference point.

In an optional embodiment, the step of determining the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack includes:

Determine the key components in the battery pack according to the influence of each component in the battery pack on the temperature acquisition of the temperature sensor at the preset position under high temperature working conditions and low temperature working conditions;

Determine the predicted high temperature point and the predicted low temperature point of the battery pack according to the influence caused by the key components in the battery pack;

Based on the predicted high temperature point and the predicted low temperature point of the battery pack, the temperature verification position of the battery pack is determined.

In an optional embodiment, the step of determining the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack includes:

According to the temperature parameters of the battery pack, a simulation model of the battery module is established;

According to the simulation model, the predicted high temperature point and the predicted low temperature point of the battery pack are determined;

Based on the predicted high temperature point and the predicted low temperature point of the battery pack, the temperature verification position of the battery pack is determined.

In an optional embodiment, in the case of a high temperature working condition and a low temperature working condition of the battery pack, the first temperature corresponding to the temperature verification position is compared with the second temperature at the preset position of the temperature sensor, respectively. steps, including:

Setting a temperature sensor at each temperature verification position to collect the first temperature;

In the case of the high temperature working condition of the battery pack, comparing the highest first temperature in the temperature verification position with the highest second temperature in the preset position of the temperature sensor;

In the case of the low temperature working condition of the battery pack, the lowest first temperature in the temperature verification position is compared with the lowest second temperature in the preset position of the temperature sensor.

In a second aspect, the embodiment provides an apparatus for determining the position of a battery pack temperature sensor, the apparatus comprising:

The first determination module determines the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack;

A comparison module, in the case of a high temperature working condition and a low temperature working condition of the battery pack, respectively comparing the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor;

The second determination module, if the first temperature corresponding to the temperature verification position does not exist under high temperature conditions is higher than the second temperature and partially exceeds the first temperature threshold, and under low temperature conditions, there is no If the first temperature corresponding to the temperature verification position is lower than the second temperature and partially exceeds the second temperature threshold, the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor.

In a third aspect, an embodiment provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be executed on the processor, and the processor implements the foregoing implementation when executing the computer program The steps of any one of the methods.

In a fourth aspect, embodiments provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the machine-executable instructions to process The device implements the steps of the method described in any one of the preceding embodiments.

The embodiments of the present invention provide a method, device, and electronic device for determining the position of a battery pack temperature sensor. By predicting the high and low temperature points of the battery pack, the temperature verification position of the battery pack is determined, and based on the temperature verification position, the The preset position of the temperature sensor in the battery pack is checked, that is, the first temperature of the temperature verification position under high temperature and low temperature conditions is compared with the second temperature of the preset position of the temperature sensor, if it does not exist under high temperature conditions The first temperature that is higher than the second temperature and exceeds the first temperature threshold, and there is no first temperature that is lower than the second temperature and exceeds the second temperature threshold under low temperature conditions, can be determined according to the current preset position of the temperature sensor The layout of the temperature sensor, the layout position can determine the highest point and the lowest point during the use of the battery pack, which can ensure the safety and reliability of the battery pack.

Additional features and advantages of the present disclosure will be set forth in the description that follows, or some may be inferred or unambiguously determined from the description, or may be learned by practicing the above-described techniques of the present disclosure.

In order to make the above-mentioned objects, features and advantages of the present disclosure more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a flowchart of a method for determining the location of a battery pack temperature sensor provided by an embodiment of the present invention;

2 is a schematic diagram of a battery pack test working condition provided by an embodiment of the present invention;

3 is a schematic diagram of the temperature of a battery pack module under the influence of a long copper bar and an end plate according to an embodiment of the present invention;

4 is a schematic diagram of the temperature of a battery pack module under the influence of water flow of a water-cooling plate according to an embodiment of the present invention;

5 is a schematic diagram of the arrangement of a temperature sensor of a battery pack module according to an embodiment of the present invention;

6 is a schematic diagram of the arrangement of a temperature sensor of another battery pack module provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a whole-process temperature rise curve corresponding to a working condition according to an embodiment of the present invention;

8 is a schematic diagram of a temperature difference curve corresponding to a working condition according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a whole-process temperature rise curve corresponding to a working condition 2 provided by an embodiment of the present invention;

10 is a schematic diagram of a temperature difference curve corresponding to a working condition 2 provided by an embodiment of the present invention;

11 is a schematic diagram of a whole-process temperature rise curve corresponding to a working condition three according to an embodiment of the present invention;

12 is a schematic diagram of a temperature difference curve corresponding to a working condition three according to an embodiment of the present invention;

13 is a schematic diagram of a whole-process temperature rise curve corresponding to a working condition four according to an embodiment of the present invention;

14 is a schematic diagram of a temperature difference curve corresponding to a working condition 4 provided by an embodiment of the present invention;

15 is a schematic diagram of a whole-process temperature rise curve corresponding to a working condition five provided by an embodiment of the present invention;

16 is a schematic diagram of a temperature difference curve corresponding to a working condition five according to an embodiment of the present invention;

17 is a functional block diagram of an apparatus for determining the position of a battery pack temperature sensor provided by an embodiment of the present invention;

FIG. 18 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The two preset temperature sensors of each module in the current battery pack may not collect the minimum or maximum temperature of the battery pack during the actual application process, which means that the battery pack has a higher temperature than that collected by the current temperature sensor. low or high temperature.

In practical applications, in high temperature conditions, the thermal management strategy or charging and discharging strategy is generally implemented according to the highest collection temperature of the battery pack; while in low temperature conditions, the thermal management strategy or charging and discharging strategy is implemented according to the lowest collection temperature of the battery pack. discharge strategy. At this time, only performing the above control based on the temperature collected by the current sensor will lead to errors in thermal management and charge-discharge control, thereby affecting the safety of the battery pack.

Based on this, the embodiments of the present invention provide a method, device, and electronic device for determining the position of a battery pack temperature sensor. By checking the arrangement position of the temperature sensor, the highest temperature that can be collected for the battery pack under high temperature conditions is determined. The precise position of the sensor for the lowest temperature in low temperature conditions.

To facilitate understanding of this embodiment, a method for determining the position of a battery pack temperature sensor disclosed in the embodiment of the present invention is first introduced in detail. The method can be applied to intelligent devices such as a host computer, a server, and a controller.

FIG. 1 is a flowchart of a method for determining the location of a battery pack temperature sensor provided by an embodiment of the present invention.

As shown in Figure 1, the method includes the following steps:

Step S102: Determine the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack.

Among them, the predicted high temperature point and the predicted low temperature point are the position points that may appear in the battery pack under high temperature conditions and low temperature conditions, respectively, which are higher or lower than the temperature collected by the preset position temperature sensor; as a possible In an optional embodiment, the locations of the predicted high temperature point and the predicted low temperature point can be used as the temperature verification location of the battery pack.

Step S104 , in the case of the high temperature working condition and the low temperature working condition of the battery pack, respectively compare the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor.

Among them, in the actual application process of the battery pack, including high temperature conditions and low temperature conditions, under these two conditions, the first temperature and preset position sensors for the predicted temperature high point and the predicted temperature low point position may occur. the second temperature for comparison.

Step S106, if there is no first temperature corresponding to the temperature verification position under high temperature conditions that is higher than the second temperature and partially exceeds the first temperature threshold, and, under low temperature conditions, there is no first temperature corresponding to the temperature verification position. When the temperature is lower than the second temperature and the lower part exceeds the second temperature threshold, the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor.

It can be understood that, if the second temperature collected by the temperature sensor at the preset position always collects the highest temperature or the lowest temperature under high temperature and low temperature conditions, it is considered that the preset position of the temperature sensor is more accurate. The installation and layout of the temperature sensor can be realized by the preset position.

In a preferred embodiment of practical application, the temperature verification position of the battery pack is determined by predicting the high temperature point and the low temperature point of the battery pack, and the preset position of the temperature sensor in the battery pack is checked based on the temperature verification position. The first temperature at the temperature verification position under the high temperature working condition and the low temperature working condition is compared with the second temperature at the preset position of the temperature sensor, if there is no first temperature higher than the second temperature and more than the first temperature threshold under the high temperature working condition temperature, and there is no first temperature that is lower than the second temperature and exceeds the second temperature threshold under low temperature conditions, the layout of the temperature sensor can be determined according to the current preset position of the temperature sensor. This layout position can determine the battery The highest and lowest points during the use of the battery pack can ensure the safety and reliability of the battery pack.

In some embodiments, if the battery pack is in a high temperature condition or a low temperature condition at any time, the first temperature at the temperature verification position is higher than the temperature threshold when compared with the excess part of the second temperature at the preset position of the temperature sensor, then The preset position of the temperature sensor needs to be adjusted to meet the use safety of the battery pack. Specifically, the above method further includes:

Step 1.1), if the first temperature corresponding to the temperature verification position is higher than the second temperature and exceeds the first temperature threshold under high temperature conditions, or, under low temperature conditions, there is a temperature verification position corresponding to the temperature. If the first temperature is lower than the second temperature and exceeds the second temperature threshold, the preset position of the temperature sensor is adjusted, and the first temperature corresponding to the temperature verification position is compared with the first temperature of the adjusted preset position of the temperature sensor. The three temperatures are compared until the arrangement position of the temperature sensor is determined.

As an optional embodiment, the high temperature condition may include charge-discharge cycle condition, constant power discharge condition, and high temperature exposure condition, etc. The temperature sensor (NTC) preset position Tmax and the non-NTC position (temperature verification position) ) Tmax size relationship, there are three cases:

A. If the NTC preset position Tmax > non-NTC position Tmax, it means that the preset layout position of the NTC can collect the highest temperature of the cell in this working condition; the preset position of the temperature sensor can be used as the layout position;

B. If the NTC preset position Tmax is slightly less than the non-NTC position Tmax, and the difference is less than or equal to 1°C (the first temperature threshold), it is also considered that the preset layout position of the NTC can collect the highest temperature of the cell in this working condition; The preset position of the temperature sensor can be used as the layout position;

Among them, the acquisition error of a single NTC is ±0.5°C, and the difference between the two is the first temperature threshold of 1°C, that is, the first temperature threshold can be set according to the acquisition error of a single temperature sensor to ensure the reliability of the battery pack.

C. If the NTC preset position Tmax < non-NTC position Tmax, and the difference is > 1°C (the second temperature threshold), then the NTC arranged in the preset position cannot collect the highest temperature of the cell in this working condition, and should be based on Test results, re-select the NTC position of the module.

It can be understood that the second temperature threshold may be equal to the first temperature threshold.

On the basis of the foregoing embodiment, as another optional embodiment, the low temperature working condition may include low temperature exposure, low temperature heating, etc., the magnitude relationship between the NTC preset position Tmin and the non-NTC position (temperature verification position) Tmin, There are also three cases:

D. If the NTC preset position Tmin < non-NTC position Tmin, it means that the preset position of the NTC currently arranged can collect the lowest temperature of the cell in this working condition, and the temperature sensor can be installed according to the preset position;

E. If the NTC preset position Tmin is slightly > the non-NTC position Tmin, and the difference is less than or equal to 1°C (the first temperature threshold), it is also considered that the preset position of the NTC arrangement can collect the lowest temperature of the cell in this working condition, The temperature sensor can be installed according to the preset position;

F. If the NTC preset position Tmin > non-NTC position Tmin, and the difference > 1°C (the second temperature threshold), the NTC set at the preset position cannot collect the minimum temperature of the cell in this working condition. Test results, re-select the NTC layout position of the module.

In some embodiments, since the battery pack will be involved in high temperature and low temperature conditions, there will be some components that affect the temperature of the temperature sensor. By analyzing the influence of the existence of such components, it is possible to predict that the battery may have a high temperature point and temperature low point; exemplarily, step S102, including:

Step 2.1), according to the influence of each component in the battery pack on the temperature acquisition of the temperature sensor at the preset position under high temperature and low temperature conditions, determine the key components in the battery pack.

Among them, the key components are components that have a great influence on the temperature acquisition of the temperature sensor at the preset position, and the key components may include long copper bars, end plates, water cooling plates, and the like.

According to the influence of the long copper bars and end plates in Fig. 3 and the influence of the water flow of the water-cooling plate in Fig. 4, the position where the cell temperature will be abnormal under high temperature or low temperature conditions is marked with a rectangular frame, such as the cell temperature. The edge position of the module; among them, under the high temperature condition, the temperature of the long copper bar and the end plate is relatively high, which is affected by the heating of the upper water cooling plate and the copper bar, and the cells connected to the long copper bar are affected by heat radiation. It will cause its temperature to be high, that is, the edge position of the cell module marked by the rectangular frame has a higher temperature, and the temperature of the water outlet side is also higher; under low temperature conditions, the end plate is connected to the lower box and is connected to the end plate. The temperature of the connected cells is low, because the heat of the cells will be conducted to the shell through the end plate, that is, because the cells are close to the end plates and the external environment, the temperature of the cells marked with a rectangular frame is lower; the water outlet The cell position on the side is also cooler.

Step 2.2), according to the influence caused by the key components in the battery pack, determine the predicted high temperature point and the predicted low temperature point of the battery pack.

Here, the point where the temperature increases under the influence of key components is called the predicted temperature high point, and is the predicted temperature low point anyway.

Step 2.3), determining the temperature verification position of the battery pack based on the predicted high temperature point and the predicted low temperature point of the battery pack.

Wherein, the predicted high temperature point and the predicted low temperature point can be used as the temperature verification position, and the second temperature collected by the preset position of the temperature sensor can be verified according to the first temperature of the position.

In other embodiments, the simulation model of the battery module can also be used to predict possible high temperature points and low temperature points of the battery; exemplarily, step S102 further includes:

Step 3.1), establishing a simulation model of the battery module according to the temperature parameters of the battery pack.

The temperature parameters may include inlet water temperature, heat exchange boundary conditions, ambient temperature, natural convection heat transfer coefficient, etc. Based on the above temperature parameters, a simulation model of each module in the battery pack can be established.

Step 3.2), according to the simulation model, determine the predicted high temperature point and the predicted low temperature point of the battery pack.

Here, based on the temperature cloud map output by the simulation model, the temperature of each point of the module can be known, and then the predicted high temperature point and the predicted low temperature point can be selected.

Step 3.3), determining the temperature verification position of the battery pack based on the predicted high temperature point and the predicted low temperature point of the battery pack.

It should be noted that each battery pack includes multiple modules. In order to avoid thermal runaway of the modules and detect the influence deviation of thermal runaway as soon as possible, each module includes two preset positions of temperature sensors. In the actual application process, the battery pack in the embodiment of the present invention has twenty-four modules, and each module is respectively provided with an NTC at the middle position and the outer edge position, that is, the battery pack has a total of forty-eight temperature sensor preset positions For example, T1-T48, and a total of twelve predicted high temperature points and predicted low temperature points determined in the foregoing embodiment, as shown in FIG. 5 and FIG. 6 .

In some embodiments, it is necessary to compare the first temperature of the temperature verification position in the whole process of application of the battery pack with the second temperature of the preset position of the temperature sensor to ensure the application reliability of the battery pack. In step S104, it is also possible to This is achieved through the following steps, including:

Step 4.1), set a temperature sensor at each temperature verification position to collect the first temperature.

Among them, the temperature collection at each temperature verification position can be realized by setting a sensor at the position, and the setting position (temperature verification position) of the temperature sensor is shown in the black bold rectangle in Fig. 6 .

It should be noted that the positions 1, 2, 3, 8, 10, and 12 indicated by the black bold rectangular box are affected by the long copper bar under high temperature conditions, and the temperature is higher; under low temperature conditions, it is close to the end plate and The external environment, the temperature is low; the positions 4 and 5 shown by the black bold rectangular box are in high temperature conditions, which are affected by the heating of the upper water cooling plate and the copper bar, and the temperature is high; the position 6 shown by the black bold rectangular box , 7, 9, and 11 are affected by the water outlet side in high temperature conditions, and the temperature is higher; in low temperature conditions, affected by the water outlet side, the temperature is lower.

Step 4.2), in the case of the high temperature working condition of the battery pack, compare the highest first temperature in the temperature verification position with the highest second temperature in the preset position of the temperature sensor.

It can be understood that, in order to know whether the preset position of the temperature sensor can collect the highest temperature under high temperature conditions, the highest temperature in the first temperature is compared with the highest temperature in the second temperature.

Step 4.3), in the case of the low temperature working condition of the battery pack, compare the lowest first temperature in the temperature verification position with the lowest second temperature in the preset position of the temperature sensor.

Among them, the low temperature working condition and the high temperature working condition are the same, and will not be repeated here.

In some embodiments, if the preset position of the temperature sensor in step 1.1) of the foregoing embodiment cannot collect the highest temperature or the lowest temperature during the application of the battery pack, the preset position of the temperature sensor can be adjusted, specifically including:

Step 5.1), if the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part is greater than the first temperature threshold under high temperature conditions, then it is determined that under high temperature conditions, the temperature is affected The key components of the battery pack collected by the sensor temperature; the key components in the battery pack are redesigned, re-selected or adjusted.

Among them, if there is a high-point temperature that cannot be collected by the temperature sensor at the preset position under high temperature conditions, first redesign or re-selection of additional heat sources (key components) that may affect the temperature of the cell, such as relays and copper bars.

Step 5.2), if the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part is greater than the second temperature threshold under low temperature conditions, it is determined that under low temperature conditions, the temperature is affected The key components of the battery pack collected by the sensor temperature; the key components in the battery pack are redesigned, re-selected or adjusted.

Among them, if there is a low temperature that cannot be collected by the temperature sensor at the preset position under low temperature conditions, the key components that may affect the temperature of the cell, such as the liquid cooling system, are first redesigned or re-selected.

In some embodiments, after the adjustment of key components in the aforementioned steps 5.1)-5.2), there are still low temperature points or high temperature points that cannot be collected by the temperature sensor at the predicted position, then the following methods can also be used to adjust the temperature sensor preset. location, including:

Step 6.1), replace the positive and negative electrodes of each module in the battery pack.

As shown in Figure 6, it can be seen that each module includes a positive electrode and a negative electrode. It can be adjusted by replacing the original positive electrode with a negative electrode and replacing the negative electrode with a positive electrode. Compare with the second temperature again.

or,

Step 6.2), if there is a temperature verification position that is higher than the second temperature and higher than the first temperature threshold under high temperature conditions, or if there is a temperature verification position lower than the second temperature and lower than the first temperature threshold under low temperature conditions For some temperature verification positions greater than the second temperature threshold, the preset position of the temperature sensor of the target module is symmetrically adjusted with the center position of the target module where the preset position of the temperature sensor with abnormal temperature is located as a reference point.

Among them, the module where the temperature sensors T13 and T14 are located is taken as an example to illustrate. Currently, T14 is set on the bottom edge of the module, and T13 is set on the right side of the module; if there is a temperature abnormality under high temperature or low temperature conditions Click on the module, that is, the center position G of the module can be used as the reference point, and the setting positions of the temperature sensors T13 and T14 can be adjusted symmetrically. For example, set T14 on the top side of the module, and set T13 on the left side of the module. side and so on.

It can be understood that the adjustment method of the above steps can be used to adjust the preset position of the temperature sensor until the comparison between the first temperature of the adjusted temperature verification position of the module and the second temperature of the temperature preset position meets the requirements, and it is determined that The temperature sensor placement positions of the predicted high temperature point and the predicted low temperature point can be collected.

The embodiment of the present invention can ensure that the NTC can accurately collect the battery temperature at any time in various battery operating conditions, that is, the highest temperature of the battery pack can be collected in high temperature operating conditions and the lowest temperature can be collected in low temperature operating conditions, thereby ensuring battery thermal management and charging. Reliability of discharge control strategies.

In some embodiments, in order to ensure that the method for determining the position of the temperature sensor provided by the above embodiments has the effect of accurately collecting the battery temperature at any time, that is, the highest temperature of the battery pack can be collected in high temperature conditions and the lowest temperature can be collected in low temperature conditions, according to customer policies. For the product specification requirements (Specification Of Requirements, sor) issued by the supplier, the test is carried out in the five test conditions shown in Figure 2.

Working condition 1: 35KW discharge + charge cycle condition, according to the whole process temperature rise curve shown in Figure 7, in the whole process of discharge and charge cycle, NTC position Tmax > non-NTC position Tmax, indicating that the NTC layout position is in this working condition. The maximum temperature of the battery cell can be collected in the condition; and the NTC position Tmax is compared with the non-NTC position Tmax, and the temperature difference curve between the two is obtained as shown in Figure 8. It can be known that in the discharge and charge cycle conditions, the NTC can collect the power The maximum temperature of the core.

Condition 2: 61.5KW discharge condition, according to the whole process temperature rise curve shown in Figure 9, the NTC position Tmax is compared with the non-NTC position Tmax, and the temperature difference curve between the two is shown in Figure 10.

Among them, in the whole process of 61.5KW discharge, the NTC position Tmax in the early stage of discharge is slightly smaller than the non-NTC position Tmax, and the difference is less than 0.4°C. Since the NTC acquisition error is ±0.5°C and the temperature difference error is ±1°C, it is considered that the difference is poor. The value ≤ 1°C is reasonable; and in the later stage of discharge, NTC position Tmax > non-NTC position Tmax, indicating that the arrangement position of NTC can collect the highest temperature of the cell in this working condition.

Therefore, in the 61.5KW discharge condition, the NTC can collect the highest temperature of the cell.

Working condition 3: high temperature exposure condition, according to the whole process temperature rise curve shown in Figure 11, in the whole process of discharge and charge cycle, NTC position Tmax > non-NTC position Tmax, indicating that the arrangement position of NTC can be used in this working condition. Collect the highest temperature of the cell. The NTC position Tmax is compared with the non-NTC position Tmax, and the temperature difference curve between the two is obtained, as shown in Figure 12. It can be seen that under high temperature exposure conditions, NTC can collect the highest temperature of the cell.

Working condition 4: low temperature exposure condition, according to the whole process temperature rise curve shown in Figure 13, in the whole process of low temperature exposure, in the early stage NTC position Tmin < non-NTC position Tmin, in the later stage NTC position Tmin is slightly larger than non-NTC position Tmin, the difference is 0.2℃≤1℃. The NTC position Tmin is compared with the non-NTC position Tmin, and the temperature difference curve between the two is obtained, as shown in Figure 14, indicating that the arrangement position of the NTC can collect the lowest temperature of the cell in this working condition, that is, in the low temperature exposure condition, NTC can collect the lowest temperature of the cell.

Condition 5: low temperature heating condition, according to the temperature rise curve of the whole process shown in Figure 15, in the whole process of low temperature heating, NTC position Tmin < non-NTC position Tmin, indicating that the arrangement position of NTC can be collected in this working condition to the minimum temperature of the cell. The NTC position Tmin is compared with the non-NTC position Tmin, and the temperature difference curve between the two is obtained, as shown in Figure 16, that is, in the low temperature heating condition, the NTC can collect the lowest temperature of the cell.

As shown in FIG. 17 , an embodiment of the present invention further provides an apparatus 200 for determining the position of a temperature sensor of a battery pack. The apparatus includes:

The first determination module 201 determines the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack;

The comparison module 202, in the case of the high temperature working condition and the low temperature working condition of the battery pack, respectively compares the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor;

The second determination module 203, if the first temperature corresponding to the temperature verification position does not exist under the high temperature condition is higher than the second temperature and exceeds the first temperature threshold, and the temperature does not exist under the low temperature condition If the first temperature corresponding to the verification position is lower than the second temperature and exceeds the second temperature threshold, the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor.

In some embodiments, the second determination module 203 is further specifically configured to, if the first temperature corresponding to the temperature verification position exists under the high temperature condition is higher than the second temperature and exceeds the first temperature threshold, or, Under low temperature conditions, if the first temperature corresponding to the temperature verification position is lower than the second temperature and exceeds the second temperature threshold, the preset position of the temperature sensor is adjusted, and the first temperature corresponding to the temperature verification position is adjusted. A temperature is compared with the adjusted third temperature at the preset position of the temperature sensor until the arrangement position of the temperature sensor is determined.

In some embodiments, the second determination module 203 is further specifically configured to, if the first temperature corresponding to the temperature verification position exists under the high temperature condition is higher than the second temperature and the higher part is greater than the first temperature threshold , then determine the key components of the battery pack that affect the temperature collection of the temperature sensor under high temperature conditions; redesign, re-select or adjust the key components in the battery pack; If the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part is greater than the second temperature threshold, then determine the key components of the battery pack that affect the temperature collection of the temperature sensor under low temperature conditions; The key components in the battery pack are redesigned, resized or adjusted.

In some embodiments, the second determining module 203 is further specifically configured to replace the positive electrode and the negative electrode of each module in the battery pack; or, if there is a temperature higher than the second temperature under high temperature conditions and higher than part of the temperature verification position greater than the first temperature threshold, or, if there is a temperature verification position lower than the second temperature and lower than part of the temperature verification position greater than the second temperature threshold under low temperature conditions, the abnormal temperature is used. The center position of the target module where the sensor preset position is located is the reference point, and the temperature sensor preset position of the target module is adjusted symmetrically.

In some embodiments, the first determination module 201 is further specifically configured to, according to the influence of each component in the battery pack on the temperature acquisition of the temperature sensor at the preset position under high temperature working conditions and low temperature working conditions, Determine the key components in the battery pack; determine the predicted high temperature point and the predicted low temperature point of the battery pack according to the influence caused by the key components in the battery pack; based on the predicted high temperature point and predicted temperature of the battery pack Low point, determine the temperature verification position of the battery pack.

In some embodiments, the first determining module 201 is further specifically configured to, according to the temperature parameter of the battery pack, establish a simulation model of the battery module; according to the simulation model, determine that the predicted temperature of the battery pack is high point and predicted temperature low point; based on the predicted high temperature point and the predicted low temperature point of the battery pack, determine the temperature verification position of the battery pack.

In some embodiments, the comparison module 202 is further specifically configured to set a temperature sensor at each temperature verification position to collect a first temperature; in the case of a high temperature working condition of the battery pack, set the temperature verification position to The highest first temperature in the temperature sensor is compared with the highest second temperature in the preset position of the temperature sensor; in the case of the low temperature working condition of the battery pack, the lowest first temperature in the temperature verification position is compared with the all The lowest second temperature in the preset position of the temperature sensor is compared.

FIG. 18 is a schematic diagram of a hardware architecture of an electronic device 300 according to an embodiment of the present invention. 18, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may also include a non-volatile storage medium 303, a communication interface 304 and a bus 305; wherein the machine-readable storage medium 301, The processor 302 , the non-volatile storage medium 303 and the communication interface 304 communicate with each other through the bus 305 . The processor 302 can execute the method for determining the location of the battery pack temperature sensor described in the above embodiments by reading and executing the machine-executable instructions for determining the location of the battery pack temperature sensor in the machine-readable storage medium 301 .

A machine-readable storage medium referred to herein can be any electronic, magnetic, optical, or other physical storage device that can contain or store information, such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as optical disk) , DVD, etc.), or similar storage media, or a combination thereof.

The non-volatile medium may be non-volatile memory, flash memory, storage drives (eg, hard drives), storage disks of any type (eg, optical discs, dvds, etc.), or similar non-volatile storage media, or a combination thereof.

It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding steps in the above method embodiment, and details are not repeated here.

A computer-readable storage medium is provided by an embodiment of the present invention, and a computer program is stored in the readable storage medium. When the computer program code is executed, the method for determining the position of a battery pack temperature sensor described in any of the foregoing embodiments can be implemented. , and the specific implementation can refer to the method embodiment, which is not repeated here.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the system and device described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Finally, it should be noted that the above-mentioned embodiments are only specific implementations of the present invention, and are used to illustrate the technical solutions of the present invention, but not to limit them. The protection scope of the present invention is not limited thereto, although referring to the foregoing The embodiment has been described in detail the present invention, those of ordinary skill in the art should understand: any person skilled in the art who is familiar with the technical field within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments. Or can easily think of changes, or equivalently replace some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered in the present invention. within the scope of protection.

Claims (10)

1. A method for determining the position of a battery pack temperature sensor, wherein the method comprises: Determine the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack; In the case of the high temperature working condition and the low temperature working condition of the battery pack, respectively comparing the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor; If the first temperature corresponding to the temperature verification position is not higher than the second temperature and partially exceeds the first temperature threshold under high temperature conditions, and there is no temperature verification position corresponding to the temperature verification position under low temperature conditions The first temperature of the temperature sensor is lower than the second temperature and the lower part exceeds the second temperature threshold, then the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor. 2. The method according to claim 1, wherein the method further comprises: If the first temperature corresponding to the temperature verification position is higher than the second temperature and partially exceeds the first temperature threshold under high temperature conditions, or, under low temperature conditions, there is a first temperature corresponding to the temperature verification position When a temperature is lower than the second temperature and partially exceeds the second temperature threshold, the preset position of the temperature sensor is adjusted, and the first temperature corresponding to the temperature verification position is compared with the adjusted preset position of the temperature sensor The third temperature is compared until the arrangement position of the temperature sensor is determined. 3. The method according to claim 2, wherein the step of adjusting the preset position of the temperature sensor comprises: If the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part is larger than the first temperature threshold under the high temperature condition, it is determined that under the high temperature condition, the temperature acquisition of the temperature sensor is affected. key components of the battery pack; redesign, re-selection or adjustment of the key components in the battery pack; If the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part is greater than the second temperature threshold under the low temperature condition, it is determined that under the low temperature condition, the temperature acquisition of the temperature sensor is affected. Key components of the battery pack; redesign, remodel or adjust the key components in the battery pack. 4. The method according to claim 3, wherein the step of adjusting the preset position of the temperature sensor further comprises: Replace the positive and negative electrodes of each module in the battery pack; or, If there is a temperature verification location that is higher than the second temperature and partly higher than the first temperature threshold under high temperature conditions, or if there is a temperature verification position lower than the second temperature and lower than the first temperature threshold under low temperature conditions For the temperature verification position of the second temperature threshold, the preset position of the temperature sensor of the target module is symmetrically adjusted with the center position of the target module where the preset position of the temperature sensor with abnormal temperature is located as a reference point. 5. The method according to claim 1, wherein the step of determining the temperature verification position of the battery pack according to the predicted temperature high point and the predicted temperature low point of the battery pack comprises: Determine the key components in the battery pack according to the influence of each component in the battery pack on the temperature acquisition of the temperature sensor at the preset position under high temperature working conditions and low temperature working conditions; Determine the predicted high temperature point and the predicted low temperature point of the battery pack according to the influence caused by the key components in the battery pack; Based on the predicted high temperature point and the predicted low temperature point of the battery pack, the temperature verification position of the battery pack is determined. 6. The method according to claim 1, wherein the step of determining the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack comprises: According to the temperature parameters of the battery pack, a simulation model of the battery module is established; According to the simulation model, the predicted high temperature point and the predicted low temperature point of the battery pack are determined; Based on the predicted high temperature point and the predicted low temperature point of the battery pack, the temperature verification position of the battery pack is determined. 7 . The method according to claim 1 , wherein in the case of a high temperature working condition and a low temperature working condition of the battery pack, the first temperature corresponding to the temperature verification position and the temperature sensor preset position are respectively set. 8 . The second temperature comparison step includes: Setting a temperature sensor at each temperature verification position to collect the first temperature; In the case of the high temperature working condition of the battery pack, comparing the highest first temperature in the temperature verification position with the highest second temperature in the preset position of the temperature sensor; In the case of the low temperature working condition of the battery pack, the lowest first temperature in the temperature verification position is compared with the lowest second temperature in the preset position of the temperature sensor. 8. A device for determining the position of a battery pack temperature sensor, wherein the device comprises: The first determination module determines the temperature verification position of the battery pack according to the predicted high temperature point and the predicted low temperature point of the battery pack; A comparison module, in the case of a high temperature working condition and a low temperature working condition of the battery pack, respectively comparing the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor; The second determination module, if the first temperature corresponding to the temperature verification position does not exist under high temperature conditions is higher than the second temperature and partially exceeds the first temperature threshold, and under low temperature conditions, there is no If the first temperature corresponding to the temperature verification position is lower than the second temperature and partially exceeds the second temperature threshold, the arrangement position of the temperature sensor is determined based on the preset position of the temperature sensor. 9. An electronic device comprising a memory and a processor, wherein a computer program that can be run on the processor is stored in the memory, wherein the processor implements claim 1 when executing the computer program The steps of any one of to 7. 10. A machine-readable storage medium, characterized in that the machine-readable storage medium stores machine-executable instructions that, when invoked and executed by a processor, cause the processor to The steps of implementing the method of any one of claims 1 to 7.

Images