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

Abstract

The present invention provides a method, device and electronic device for determining the position of a battery pack temperature sensor, which relates to the technical field of battery pack design, including: determining the temperature verification position of the battery pack according to a predicted high temperature point and a predicted low temperature point of the battery pack; if under high temperature conditions, there is no temperature verification position corresponding to a first temperature higher than a second temperature and the higher part exceeds a first temperature threshold, and under low temperature conditions, there is no temperature verification position corresponding to a first temperature lower than the second temperature and the lower part exceeds a second temperature threshold, then determining the layout position of the temperature sensor based on a preset position of the temperature sensor; by determining the precise position of the sensor that can collect the highest temperature of the battery pack under high temperature conditions and the lowest temperature of the battery pack under low temperature conditions, the technical problem of poor safety and reliability of the battery pack is solved.

Description

Technical Field

[0001] 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 Art

[0002] The battery module is an important component of the battery pack. Generally, each module is equipped with two temperature sensors to accurately collect the highest and lowest temperatures during the use of the battery pack, and then perform corresponding thermal management or charge and discharge control.

[0003] However, in actual application, the temperature collected by the two temperature sensors set in the battery module may not be the lowest or highest temperature of the battery pack. Therefore, the reliability of the thermal management or charge and discharge control strategy executed based on the collected temperature is not high, which affects the safe use of the battery pack. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method, device and electronic device for determining the position of a battery pack temperature sensor, thereby solving the technical problem of poor safety and reliability of battery pack use by determining the precise position of the sensor that can collect the highest temperature of the battery pack under high temperature conditions and the lowest temperature under low temperature conditions.

[0005] In a first aspect, an embodiment provides a method for determining a position of a battery pack temperature sensor, the method comprising:

[0006] 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;

[0007] Under 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 of the preset position of the temperature sensor;

[0008] If under high temperature conditions, there is no first temperature corresponding to the temperature verification position that is higher than the second temperature and the higher part exceeds the first temperature threshold, and under low temperature conditions, there is no first temperature corresponding to the temperature verification position that is lower than the second temperature and the lower part exceeds the second temperature threshold, then the layout position of the temperature sensor is determined based on the preset position of the temperature sensor.

[0009] In an optional embodiment, the method further comprises:

[0010] If, under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part exceeds the first temperature threshold, or, under low temperature conditions, the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part 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 third temperature of the adjusted preset position of the temperature sensor until the layout position of the temperature sensor is determined.

[0011] In an optional embodiment, the step of adjusting the preset position of the temperature sensor includes:

[0012] If under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher temperature is greater than the first temperature threshold, then determine the key components of the battery pack that affect the temperature acquisition of the temperature sensor under high temperature conditions; redesign, reselect or adjust the key components in the battery pack;

[0013] If under low temperature conditions, 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 the key components of the battery pack that affect the temperature collection of the temperature sensor under low temperature conditions are determined; the key components in the battery pack are redesigned, reselected or adjusted.

[0014] In an optional embodiment, the step of adjusting the preset position of the temperature sensor further includes:

[0015] Replacing the positive electrode and the negative electrode of each module in the battery pack;

[0016] or,

[0017] If there is a temperature verification position that is higher than the second temperature and partly greater than the first temperature threshold under high temperature conditions, or if there is a temperature verification position that is lower than the second temperature and partly greater than the second temperature threshold under low temperature conditions, 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 the temperature abnormality is located as a reference point.

[0018] 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:

[0019] Determine the key components in the battery pack according to the influence of each component in the battery pack on the temperature collection of the temperature sensor at the preset position under the high temperature working condition and the low temperature working condition;

[0020] Determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the influence caused by key components in the battery pack;

[0021] Based on the predicted high temperature point and the predicted low temperature point of the battery pack, a temperature verification position of the battery pack is determined.

[0022] 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:

[0023] Establishing a simulation model of a battery module according to the temperature parameters of the battery pack;

[0024] Determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the simulation model;

[0025] Based on the predicted high temperature point and the predicted low temperature point of the battery pack, a temperature verification position of the battery pack is determined.

[0026] In an optional embodiment, in the case of a high temperature operating condition and a low temperature operating condition of the battery pack, the step of comparing the first temperature corresponding to the temperature verification position with the second temperature of the preset position of the temperature sensor respectively includes:

[0027] A temperature sensor is arranged at each temperature verification position to collect a first temperature;

[0028] In the case of a high temperature operating 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;

[0029] In the case of a low temperature operating 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.

[0030] In a second aspect, an embodiment provides a device for determining a position of a battery pack temperature sensor, the device comprising:

[0031] A first determination module determines a temperature verification position of the battery pack according to a predicted high temperature point and a predicted low temperature point of the battery pack;

[0032] a comparison module, for comparing the first temperature corresponding to the temperature verification position with the second temperature of the preset position of the temperature sensor respectively under the high temperature working condition and the low temperature working condition of the battery pack;

[0033] The second determination module determines the layout position of the temperature sensor based on the preset position of the temperature sensor if, under high temperature conditions, there is no first temperature corresponding to the temperature verification position that is higher than the second temperature and the higher part exceeds the first temperature threshold, and, under low temperature conditions, there is no first temperature corresponding to the temperature verification position that is lower than the second temperature and the lower part exceeds the second temperature threshold.

[0034] 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 run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned implementation methods are implemented.

[0035] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementations.

[0036] A method, device and electronic device for determining the position of a battery pack temperature sensor provided in an embodiment of the present invention determine the temperature verification position of the battery pack by predicting the high temperature point and the low temperature point of the battery pack, and calibrate the preset position of the temperature sensor in the battery pack based on the temperature verification position, that is, compare the first temperature of the temperature verification position under high temperature conditions and low temperature conditions with the second temperature of the preset position of the temperature sensor. If there is no first temperature that is higher than the second temperature by more than the first temperature threshold under the high temperature condition, and there is no first temperature that is lower than the second temperature by more than the second temperature threshold under the low temperature condition, then 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 highest point and the lowest point during the use of the battery pack, and can ensure the safety and reliability of the battery pack.

[0037] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0038] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A flow chart of a method for determining the position of a battery pack temperature sensor provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a battery pack test condition provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the temperature of a battery pack module under the influence of a long copper bar and an end plate provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the temperature of a battery pack module under the influence of water flow on a water cooling plate provided in an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of the arrangement of a temperature sensor of a battery pack module provided by an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the arrangement of temperature sensors of another battery pack module provided by an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of a whole-process temperature rise curve corresponding to a working condition provided in an embodiment of the present invention;

[0047] Figure 8 A schematic diagram of a temperature difference curve corresponding to a working condition provided by an embodiment of the present invention;

[0048] Fig. 9 A schematic diagram of a whole-process temperature rise curve corresponding to a second working condition provided in an embodiment of the present invention;

[0049] Fig.10 A schematic diagram of a temperature difference curve corresponding to a second working condition provided in an embodiment of the present invention;

[0050] Fig.11 A schematic diagram of a full-process temperature rise curve corresponding to three working conditions provided in an embodiment of the present invention;

[0051] Fig.12 A schematic diagram of a temperature difference curve corresponding to three working conditions provided in an embodiment of the present invention;

[0052] Fig.13A schematic diagram of a full-process temperature rise curve corresponding to a fourth working condition provided in an embodiment of the present invention;

[0053] Fig.14 A schematic diagram of a temperature difference curve corresponding to a fourth working condition provided in an embodiment of the present invention;

[0054] Fig.15 A schematic diagram of a whole-process temperature rise curve corresponding to a fifth working condition provided in an embodiment of the present invention;

[0055] Fig.16 A schematic diagram of a temperature difference curve corresponding to a fifth working condition provided in an embodiment of the present invention;

[0056] Fig.17 A functional module diagram of a device for determining the position of a battery pack temperature sensor provided by an embodiment of the present invention;

[0057] Fig.18 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The two temperature sensors preset in each module of the current battery pack may not collect the lowest or highest temperature of the battery pack during actual application, which may cause the battery pack to have a lower or higher temperature than that collected by the current temperature sensor.

[0060] In actual applications, in high-temperature conditions, the thermal management strategy or charge-discharge strategy is generally executed according to the highest collected temperature of the battery pack; in low-temperature conditions, the thermal management strategy or charge-discharge strategy is executed according to the lowest collected temperature of the battery pack. At this time, only performing the above control based on the temperature collected by the current sensor will cause errors in thermal management and charge-discharge control, thereby affecting the safety of the battery pack.

[0061] Based on this, an embodiment of the present invention provides a method, device and electronic device for determining the position of a battery pack temperature sensor. By calibrating the layout position of the temperature sensor, the precise position of the sensor that can collect the maximum temperature of the battery pack under high temperature conditions and the minimum temperature of the battery pack under low temperature conditions is determined.

[0062] To facilitate understanding of this embodiment, a method for determining the position of a battery pack temperature sensor disclosed in an embodiment of the present invention is first introduced in detail. This method can be applied to intelligent devices such as host computers, servers, and controllers.

[0063] Figure 1 A flow chart of a method for determining the position of a battery pack temperature sensor provided in an embodiment of the present invention.

[0064] like Figure 1 As shown, the method comprises the following steps:

[0065] Step S102, determining a temperature verification position of the battery pack according to a predicted high temperature point and a predicted low temperature point of the battery pack.

[0066] Among them, the predicted temperature high point and the predicted temperature low point are the location points in the battery pack that may appear higher or lower than the temperature collected by the temperature sensor at the preset position under high temperature conditions and low temperature conditions, respectively; as an optional implementation, the locations of the predicted temperature high point and the predicted temperature low point can be used as the temperature verification positions of the battery pack.

[0067] Step S104 , under the high temperature condition and the low temperature condition of the battery pack, respectively compare the first temperature corresponding to the temperature verification position with the second temperature of the preset position of the temperature sensor.

[0068] Among them, during the actual application of the battery pack, including high temperature conditions and low temperature conditions, the first temperature at the predicted high temperature point and the predicted low temperature point under these two conditions will be compared with the second temperature collected by the preset position sensor.

[0069] Step S106, if under high temperature conditions, there is no temperature verification position corresponding to a first temperature higher than the second temperature and the higher part exceeds the first temperature threshold, and under low temperature conditions, there is no temperature verification position corresponding to a first temperature lower than the second temperature and the lower part exceeds the second temperature threshold, then determine the layout position of the temperature sensor based on the preset position of the temperature sensor.

[0070] It can be understood that if the second temperature collected by the temperature sensor at the preset position is always 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, and the installation and layout of the temperature sensor can be implemented based on the preset position.

[0071] In a preferred embodiment of actual 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, that is, the first temperature of the temperature verification position under high temperature conditions and low temperature conditions and the second temperature of the preset position of the temperature sensor are compared. If there is no first temperature that is higher than the second temperature by more than the first temperature threshold under high temperature conditions, and there is no first temperature that is lower than the second temperature by more than the second temperature threshold under low temperature conditions, then 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 highest and lowest points of the battery pack during use, and can ensure the safety and reliability of the battery pack.

[0072] In some embodiments, if the battery pack is in a high temperature condition or a low temperature condition at any time, the first temperature of the temperature verification position exceeds the second temperature of the temperature sensor preset position by a portion higher than the temperature threshold, the temperature sensor preset position needs to be adjusted to meet the safety of the battery pack. Specifically, the above method further includes:

[0073] Step 1.1), if under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and exceeds the first temperature threshold, or, under low temperature conditions, the first temperature corresponding to the temperature verification position is lower than the second temperature and exceeds the second temperature threshold, then adjust the temperature sensor preset position, and compare the first temperature corresponding to the temperature verification position with the third temperature of the adjusted temperature sensor preset position until the layout position of the temperature sensor is determined.

[0074] As an optional embodiment, the high temperature condition may include a charge and discharge cycle condition, a constant power discharge condition, a high temperature exposure condition, etc. There are three cases for the relationship between the temperature sensor (NTC) preset position Tmax and the non-NTC position (temperature verification position) Tmax:

[0075] 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 battery cell in this working condition; the preset position of the temperature sensor can be used as the layout position;

[0076] B. If the preset position Tmax of the NTC is slightly less than the non-NTC position Tmax, and the difference is ≤1°C (the first temperature threshold), it is also considered that the preset position of the NTC can collect the highest temperature of the battery cell in this working condition; the preset position of the temperature sensor can be used as the layout position;

[0077] 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.

[0078] C. If the NTC preset position Tmax is less than the non-NTC position Tmax, and the difference is greater than 1°C (the second temperature threshold), the NTC arranged at the preset position cannot collect the highest temperature of the battery cell under this working condition. The NTC position of the module should be reselected based on the test results.

[0079] It can be understood that the second temperature threshold may be equal to the first temperature threshold.

[0080] Based on the above embodiment, as another optional embodiment, the low temperature working condition may include low temperature exposure, low temperature heating, etc., and the size relationship between the NTC preset position Tmin and the non-NTC position (temperature verification position) Tmin also has three cases:

[0081] D. If the NTC preset position Tmin is less than the non-NTC position Tmin, it means that the preset position of the NTC currently arranged can collect the lowest temperature of the battery cell in this working condition, and the temperature sensor can be installed according to the preset position;

[0082] E. If the NTC preset position Tmin is slightly greater than the non-NTC position Tmin, and the difference is ≤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 battery cell in this working condition, and the temperature sensor can be installed according to the preset position;

[0083] F. If the NTC preset position Tmin is greater than the non-NTC position Tmin, and the difference is greater than 1°C (the second temperature threshold), the NTC set at the preset position cannot collect the lowest temperature of the battery cell under this working condition. The NTC layout position of the module should be reselected based on the test results.

[0084] In some embodiments, since the battery pack may involve high temperature and low temperature conditions, there may be some components that affect the temperature of the temperature sensor. By analyzing the influence of such components, the high and low temperature points that may exist in the battery are predicted; illustratively, step S102 includes:

[0085] Step 2.1), determining the key components in the battery pack according to the influence of each component in the battery pack on the temperature collection of the temperature sensor at a preset position under high temperature conditions and low temperature conditions.

[0086] Among them, the key components are components that have a great influence on the temperature collection of the temperature sensor at the preset position. The key components may include long copper bars, end plates, water-cooled plates, etc.

[0087] according to Figure 3 The influence of the middle and long copper bars and end plates and Figure 4 Due to the influence of water flow on the water-cooled plate, the positions where the battery cell temperature will be abnormal under high temperature or low temperature conditions are marked with rectangular frames, such as the edge of the battery cell module; among them, under high temperature conditions, the temperature of the long copper busbar and the end plate is relatively high. Affected by the heat generated by the upper water-cooled plate and the copper busbar, the battery cell connected to the long copper busbar will be affected by thermal radiation and will have a higher temperature, that is, the edge of the battery cell module marked with a rectangular frame has a higher temperature, and the temperature on the water outlet side is also high; under low temperature conditions, the end plate is connected to the lower box body, and the temperature of the battery cell connected to the end plate is relatively low, because the battery cell will conduct heat to the shell through the end plate, that is, because the battery cell is close to the end plate and the external environment, the temperature of the battery cell position marked with a rectangular frame is relatively low; the temperature of the battery cell position on the water outlet side is also relatively low.

[0088] Step 2.2), determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the influence caused by the key components in the battery pack.

[0089] Here, the point where the temperature rises under the influence of key components is called the predicted temperature high point, and the point where the temperature rises is called the predicted temperature low point.

[0090] Step 2.3), 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.

[0091] Among them, the predicted temperature high point and the predicted temperature low point can be used as temperature verification positions, that is, the second temperature collected at the preset position of the temperature sensor can be verified according to the first temperature at the position.

[0092] In other embodiments, the high temperature point and the low temperature point that may exist in the battery can be predicted by the simulation model of the battery module; illustratively, step S102 also includes:

[0093] Step 3.1), establishing a simulation model of the battery module according to the temperature parameters of the battery pack.

[0094] Among them, 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.

[0095] Step 3.2), determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the simulation model.

[0096] 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.

[0097] Step 3.3), 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.

[0098] It should be noted that each battery pack includes multiple modules. In order to avoid thermal runaway of the module and detect the influence deviation of thermal runaway as soon as possible, each module includes two preset positions of temperature sensors. In actual application, the battery pack in the embodiment of the present invention has 24 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 48 preset positions of temperature sensors, such as T1-T48, and the predicted high temperature points and predicted low temperature points determined in the above embodiment are a total of 12, such as Figure 5 and Figure 6 shown.

[0099] In some embodiments, it is necessary to compare the first temperature of the temperature verification position during the entire process of battery pack application with the second temperature of the preset position of the temperature sensor to ensure the application reliability of the battery pack. Step S104 can also be implemented by the following steps, specifically including:

[0100] Step 4.1), a temperature sensor is set at each temperature verification position to collect a first temperature.

[0101] The temperature of each temperature verification position can be collected by setting a sensor at the position where the temperature is verified. The setting position of the temperature sensor (temperature verification position) is as follows: Figure 6 As shown in the black bold rectangle.

[0102] It should be noted that, at positions 1, 2, 3, 8, 10, and 12 shown in the black bold rectangular box, under high temperature conditions, they are affected by the long copper busbar and have a higher temperature; under low temperature conditions, they are close to the end plate and the external environment and have a lower temperature; at positions 4 and 5 shown in the black bold rectangular box, under high temperature conditions, they are affected by the heat generated by the upper water-cooling plate and the copper busbar and have a higher temperature; at positions 6, 7, 9, and 11 shown in the black bold rectangular box, under high temperature conditions, they are affected by the water outlet side and have a higher temperature; under low temperature conditions, they are affected by the water outlet side and have a lower temperature.

[0103] Step 4.2), when the battery pack is in a high temperature condition, the highest first temperature in the temperature verification position is compared with the highest second temperature in the temperature sensor preset position.

[0104] 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.

[0105] Step 4.3), when the battery pack is in low temperature condition, compare the lowest first temperature in the temperature verification position with the lowest second temperature in the temperature sensor preset position.

[0106] Among them, the low temperature working condition is the same as the high temperature working condition, which will not be repeated here.

[0107] In some embodiments, if the preset position of the temperature sensor in step 1.1) of the above embodiment cannot collect the highest temperature or the lowest temperature during the use of the battery pack, the preset position of the temperature sensor can be adjusted, specifically including:

[0108] Step 5.1), if under high temperature conditions, 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, then determine the key components of the battery pack that affect the temperature acquisition of the temperature sensor under high temperature conditions; redesign, reselect or adjust the key components in the battery pack.

[0109] Among them, if there is a high temperature point that cannot be collected by the temperature sensor at the preset position under high temperature conditions, the additional heat sources (key components) that may affect the temperature of the battery cell, such as relays and copper busbars, should be redesigned or reselected first.

[0110] Step 5.2), if under low temperature conditions, 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 acquisition of the temperature sensor under low temperature conditions; redesign, reselect or adjust the key components in the battery pack.

[0111] Among them, if there is a low temperature under low temperature conditions that cannot be collected by the temperature sensor at the preset position, the key components that may affect the temperature of the battery cell, such as the liquid cooling system, should be redesigned or reselected first.

[0112] In some embodiments, if after the adjustment of the 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, the preset position of the temperature sensor can also be adjusted in the following manner, including:

[0113] Step 6.1), replace the positive electrode and the negative electrode of each module in the battery pack.

[0114] like Figure 6 As shown, it can be seen that each module includes a positive electrode and a negative electrode, and can be adjusted by replacing the original positive electrodes with negative electrodes, and replacing the negative electrodes with positive electrodes, and re-comparing the first temperature and the second temperature of the adjusted module.

[0115] or,

[0116] Step 6.2), if there is a temperature verification position that is higher than the second temperature and partly greater than the first temperature threshold under high temperature conditions, or if there is a temperature verification position that is lower than the second temperature and partly greater than the second temperature threshold under low temperature conditions, then the temperature sensor preset position of the target module is symmetrically adjusted with the center position of the target module where the temperature sensor preset position with the temperature abnormality is located as a reference point.

[0117] Among them, the module where the temperature sensors T13 and T14 are located is taken as an example for explanation. 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 point on the module under high or low temperature conditions, the center position G of the module can be used as a reference point to symmetrically adjust the setting positions of the temperature sensors T13 and T14, such as setting T14 on the top side of the module, setting T13 on the left side of the module, and so on.

[0118] 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 temperature verification position of the adjusted module and the second temperature of the temperature preset position meets the requirements, thereby determining the temperature sensor layout position that can collect the predicted temperature high point and the predicted temperature low point.

[0119] The embodiment of the present invention can ensure that the NTC can accurately collect the battery temperature at any time under various battery operating conditions, that is, the highest temperature of the battery pack can be collected under high temperature conditions and the lowest temperature can be collected under low temperature conditions, thereby ensuring the reliability of the battery thermal management and charge and discharge control strategy.

[0120] In some embodiments, in order to ensure that the temperature sensor position determination method provided in the above embodiment has the effect of accurately collecting the battery temperature at any time, that is, the highest temperature of the battery pack can be collected under high temperature conditions and the lowest temperature can be collected under low temperature conditions, according to the product specification requirements (Specification Of Requirements, SOR) issued by the customer to the supplier, Figure 2 The tests were carried out under the five test conditions shown in FIG.

[0121] Working condition 1: 35KW discharge + charging cycle working condition, according to Figure 7 From the temperature rise curve of the whole process shown in the figure, it can be seen that during the whole process of discharge and charge cycle, the NTC position Tmax> non-NTC position Tmax, which means that the NTC layout position can collect the highest temperature of the battery cell under this working condition; and compare the NTC position Tmax with the non-NTC position Tmax to obtain the temperature difference curve between the two as shown in Figure 8 As shown, it can be known that under the discharge-charge cycle condition, the NTC can collect the highest temperature of the battery cell.

[0122] Working condition 2: 61.5KW discharge working condition, according to Fig. 9 The temperature rise curve of the whole process is shown in the figure. Compare the Tmax of the NTC position with the Tmax of the non-NTC position to obtain the temperature difference curve between the two. Fig.10 shown.

[0123] Among them, during the entire 61.5KW discharge process, in the early stage of discharge, the Tmax at the NTC position is slightly smaller than the Tmax at the non-NTC position, with a difference of <0.4°C. Since the NTC acquisition error is ±0.5°C and the temperature difference error is ±1°C, it is considered that a difference ≤1°C is reasonable; and in the later stage of discharge, the NTC position Tmax is greater than the non-NTC position Tmax, indicating that the NTC layout position can collect the highest temperature of the battery cell under this working condition.

[0124] Therefore, under 61.5KW discharge conditions, NTC can collect the highest temperature of the battery cell.

[0125] Working condition 3: High temperature exposure working condition, according to Fig.11 The temperature rise curve of the whole process shown in the figure shows that during the whole process of discharge and charge cycle, the NTC position Tmax> non-NTC position Tmax, indicating that the NTC layout position can collect the highest temperature of the battery cell under this working condition. The NTC position Tmax is compared with the non-NTC position Tmax to obtain the temperature difference curve between the two, as shown in Fig.12 As shown in the figure, it can be seen that under high temperature exposure conditions, NTC can collect the highest temperature of the battery cell.

[0126] Working condition 4: low temperature exposure working condition, according to Fig.13 It can be seen from the temperature rise curve of the whole process that in the whole process of low temperature exposure, in the early stage, the NTC position Tmin is less than the non-NTC position Tmin, and in the later stage, the NTC position Tmin is slightly greater than the non-NTC position Tmin, with a difference of 0.2℃≤1℃. The NTC position Tmin is compared with the non-NTC position Tmin to obtain the temperature difference curve between the two, as shown in Fig.14 As shown, it means that the arrangement position of NTC can collect the lowest temperature of the battery cell in this working condition, that is, in the low temperature exposure condition, NTC can collect the lowest temperature of the battery cell.

[0127] Working condition 5: Low temperature heating working condition, according to Fig.15 The temperature rise curve of the whole process shown in the figure shows that during the whole low-temperature heating process, the NTC position Tmin is less than the non-NTC position Tmin, which means that the NTC position can collect the lowest temperature of the battery cell under this working condition. The NTC position Tmin is compared with the non-NTC position Tmin to obtain the temperature difference curve between the two, as shown in Fig.16 As shown, under low temperature heating conditions, NTC can collect the lowest temperature of the battery cell.

[0128] like Fig.17 As shown, the embodiment of the present invention further provides a device 200 for determining the position of a battery pack temperature sensor, the device comprising:

[0129] A first determination module 201 determines a temperature verification position of the battery pack according to a predicted high temperature point and a predicted low temperature point of the battery pack;

[0130] A comparison module 202, in the case of a high temperature working condition and a low temperature working condition of the battery pack, respectively compares a first temperature corresponding to the temperature verification position with a second temperature at a preset position of the temperature sensor;

[0131] The second determination module 203 determines the layout position of the temperature sensor based on the preset position of the temperature sensor if, under high temperature conditions, there is no first temperature corresponding to the temperature verification position that is higher than the second temperature and exceeds the first temperature threshold, and, under low temperature conditions, there is no first temperature corresponding to the temperature verification position that is lower than the second temperature and exceeds the second temperature threshold.

[0132] In some embodiments, the second determination module 203 is further specifically used to adjust the preset position of the temperature sensor, and compare the first temperature corresponding to the temperature verification position with the third temperature of the adjusted preset position of the temperature sensor, 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 if the first temperature corresponding to the temperature verification position is lower than the second temperature and exceeds the second temperature threshold under low temperature conditions, until the layout position of the temperature sensor is determined.

[0133] In some embodiments, the second determination module 203 is further specifically used to, if under high temperature conditions, 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, then determine the key components of the battery pack that affect the temperature acquisition of the temperature sensor under high temperature conditions; redesign, reselect or adjust the key components in the battery pack; if under low temperature conditions, 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 acquisition of the temperature sensor under low temperature conditions; redesign, reselect or adjust the key components in the battery pack.

[0134] In some embodiments, the second determination module 203 is further specifically used to replace the positive electrode and the negative electrode of each module in the battery pack; or, if there is a temperature verification position 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 that is lower than the second temperature and partly lower than the second temperature threshold under low temperature conditions, then 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 the temperature abnormality is located as a reference point.

[0135] In some embodiments, the first determination module 201 is further specifically used to determine the key components in the battery pack according to the influence of each component in the battery pack on the temperature collection of the temperature sensor at a preset position under high temperature and low temperature conditions; determine the predicted high temperature and predicted low temperature of the battery pack according to the influence caused by the key components in the battery pack; and determine the temperature verification position of the battery pack based on the predicted high temperature and predicted low temperature of the battery pack.

[0136] In some embodiments, the first determination module 201 is further specifically used to establish a simulation model of the battery module according to the temperature parameters of the battery pack; determine the predicted high temperature point and the predicted low temperature point of the battery pack according to the simulation model; and determine 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.

[0137] In some embodiments, the comparison module 202 is further specifically used to set a temperature sensor at each temperature verification position to collect a first temperature; in the case of a high temperature operating condition of the battery pack, the highest first temperature in the temperature verification position is compared with the highest second temperature in the preset position of the temperature sensor; in the case of a low temperature operating 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.

[0138] Fig.18 Schematic diagram of the hardware architecture of the electronic device 300 provided in an embodiment of the present invention. Fig.18 As shown, 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 embodiment 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.

[0139] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical or other physical storage device that can contain or store information, such as executable instructions, data, etc. For example, the machine-readable storage medium can be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as CD, DVD, etc.), or similar storage medium, or a combination thereof.

[0140] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as a CD, DVD, etc.), or a similar non-volatile storage medium, or a combination thereof.

[0141] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0142] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method for determining the position of the battery pack temperature sensor described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be repeated here.

[0143] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0144] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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 it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0145] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0146] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A method for determining the position of a battery pack temperature sensor, characterized in that: 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; wherein the predicted high temperature point and the predicted low temperature point are determined based on the temperature cloud map output by the simulation model, or are determined based on the influence caused by key components in the battery pack; the key components include long copper bars, end plates and water cooling plates; Under 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 of the preset position of the temperature sensor; If, under high temperature conditions, there is no first temperature corresponding to the temperature verification position that is higher than the second temperature and the higher part exceeds the first temperature threshold, and, under low temperature conditions, there is no first temperature corresponding to the temperature verification position that is lower than the second temperature and the lower part exceeds the second temperature threshold, then determine the layout position of the temperature sensor based on the preset position of the temperature sensor; If, under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part exceeds the first temperature threshold, or, under low temperature conditions, the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part 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 third temperature of the adjusted preset position of the temperature sensor until the layout position of the temperature sensor is determined.

2. The method according to claim 1, characterized in that: The step of adjusting the preset position of the temperature sensor comprises: If under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher temperature is greater than the first temperature threshold, then determine the key components of the battery pack that affect the temperature acquisition of the temperature sensor under high temperature conditions; redesign, reselect or adjust the key components in the battery pack; If under low temperature conditions, 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 the key components of the battery pack that affect the temperature collection of the temperature sensor under low temperature conditions are determined; the key components in the battery pack are redesigned, reselected or adjusted.

3. The method according to claim 2, characterized in that The step of adjusting the preset position of the temperature sensor further includes: Replacing the positive electrode and the negative electrode of each module in the battery pack; or, If there is a temperature verification position that is higher than the second temperature and partly greater than the first temperature threshold under high temperature conditions, or if there is a temperature verification position that is lower than the second temperature and partly greater than the second temperature threshold under low temperature conditions, 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 the temperature abnormality is located as a reference point.

4. The method according to claim 1, characterized in that: The steps 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 include: Determine the key components in the battery pack according to the influence of each component in the battery pack on the temperature collection of the temperature sensor at the preset position under the high temperature working condition and the low temperature working condition; Determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the influence caused by key components in the battery pack; Based on the predicted high temperature point and the predicted low temperature point of the battery pack, a temperature verification position of the battery pack is determined.

5. The method according to claim 1, characterized in that The steps 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 include: Establishing a simulation model of a battery module according to the temperature parameters of the battery pack; Determining a predicted high temperature point and a predicted low temperature point of the battery pack according to the simulation model; Based on the predicted high temperature point and the predicted low temperature point of the battery pack, a temperature verification position of the battery pack is determined.

6. The method according to claim 1, characterized in that In the case of a high temperature working condition and a low temperature working condition of the battery pack, the step of respectively comparing a first temperature corresponding to the temperature verification position with a second temperature of a preset position of the temperature sensor comprises: A temperature sensor is arranged at each temperature verification position to collect a first temperature; In the case of a high temperature operating 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 a low temperature operating 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.

7. A device for determining the position of a battery pack temperature sensor, characterized in that: The device comprises: A first determination module determines a temperature verification position of the battery pack according to a predicted high temperature point and a predicted low temperature point of the battery pack; wherein the predicted high temperature point and the predicted low temperature point are determined based on a temperature cloud map output by a simulation model, or are determined based on the influence of key components in the battery pack; the key components include a long copper bus, an end plate, and a water cooling plate; a comparison module, for comparing the first temperature corresponding to the temperature verification position with the second temperature of the preset position of the temperature sensor respectively under the high temperature working condition and the low temperature working condition of the battery pack; A second determination module determines the arrangement position of the temperature sensor based on the preset position of the temperature sensor if, under high temperature conditions, there is no first temperature corresponding to the temperature verification position that is higher than the second temperature and the higher part exceeds the first temperature threshold, and, under low temperature conditions, there is no first temperature corresponding to the temperature verification position that is lower than the second temperature and the lower part exceeds the second temperature threshold; The second determining module is further specifically configured to: If, under high temperature conditions, the first temperature corresponding to the temperature verification position is higher than the second temperature and the higher part exceeds the first temperature threshold, or, under low temperature conditions, the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part 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 third temperature of the adjusted preset position of the temperature sensor until the layout position of the temperature sensor is determined.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of claims 1 to 6.

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