CN115020848A - Method and device for determining position of battery pack temperature sensor and electronic equipment - Google Patents
Method and device for determining position of battery pack temperature sensor and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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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
Technical Field
The invention relates to the technical field of battery pack design, in particular to a method and a device for determining the position of a battery pack temperature sensor and electronic equipment.
Background
The battery modules are important components of the battery pack, and generally, two temperature sensors are arranged on each module so as to accurately acquire the highest temperature and the lowest temperature in the application process of the battery pack and further perform corresponding heat management or charge-discharge control.
However, in the practical application process, the temperatures collected by the two temperature sensors arranged in the battery module may not be the lowest temperature or the highest temperature of the battery pack, and therefore, the reliability of the thermal management or charge-discharge control strategy executed based on the collected temperatures is not high, and the use safety of the battery pack is affected.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for determining a location of a temperature sensor of a battery pack, and an electronic device, so as to solve the technical problem of poor safety and reliability of the battery pack in use by determining an accurate location of the sensor capable of acquiring a highest temperature of the battery pack under a high temperature condition and a lowest temperature of the battery pack under a low temperature condition.
In a first aspect, an embodiment provides a method for determining a location of a battery pack temperature sensor, where the method includes:
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;
under the conditions of a high-temperature working condition and a low-temperature working condition of the battery pack, respectively comparing a first temperature corresponding to the temperature verification position with a second temperature of a preset position of a temperature sensor;
and if the first temperature corresponding to the temperature verification position is not higher than the second temperature and is higher than a first temperature threshold partially under the high-temperature working condition, and the first temperature corresponding to the temperature verification position is not lower than the second temperature and is lower than the second temperature threshold partially under the low-temperature working condition, determining the arrangement position of the temperature sensors based on the preset position of the temperature sensors.
In an alternative embodiment, the method further comprises:
and if the first temperature corresponding to the temperature verification position is higher than the second temperature and is higher than a part of the first temperature threshold value under the high-temperature working condition, or the first temperature corresponding to the temperature verification position is lower than the second temperature and is lower than the part of the first temperature threshold value, 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 under the low-temperature working condition until the arrangement position of the temperature sensor is determined.
In an alternative 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 partially higher than a first temperature threshold value under the high-temperature working condition, determining that the temperature of the temperature sensor is influenced by key components of the battery pack under the high-temperature working condition; redesigning, re-selecting or adjusting 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 of the first temperature is larger than a second temperature threshold value under the low-temperature working condition, determining that the temperature of the temperature sensor is influenced by key components of the battery pack under the low-temperature working condition; redesigning, re-selecting or adjusting key components in the battery pack.
In an optional embodiment, 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 the temperature verification position higher than the second temperature and partially higher than the first temperature threshold exists under the high-temperature working condition, or if the temperature verification position lower than the second temperature and partially higher than the second temperature threshold exists under the low-temperature working condition, the central position of the target module where the temperature sensor preset position with abnormal temperature is located is used as a reference point, and the temperature sensor preset position of the target module is symmetrically adjusted.
In an alternative embodiment, the step of determining the temperature verification location of the battery pack based on the predicted high temperature point and the predicted low temperature point of the battery pack includes:
determining key components in the battery pack according to influences of the components in the battery pack on temperature acquisition of a temperature sensor at a preset position under high-temperature working conditions and low-temperature working conditions;
determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the influence caused by key components in the battery pack;
and determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
In an alternative embodiment, the step of determining the temperature verification location of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack includes:
establishing a simulation model of the battery module according to the temperature parameter of the battery pack;
determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the simulation model;
and determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
In an optional embodiment, under the high-temperature condition and the low-temperature condition of the battery pack, the step of comparing the first temperature corresponding to the temperature verification position with the second temperature at the preset position of the temperature sensor respectively includes:
arranging a temperature sensor at each temperature verification position to acquire a first temperature;
under the condition 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;
and under the condition of the low-temperature working condition of the battery pack, comparing the lowest first temperature in the temperature verification position with the lowest second temperature in the preset position of the temperature sensor.
In a second aspect, an embodiment provides an apparatus for determining a location of a temperature sensor of a battery pack, the apparatus comprising:
the first determination module is used for 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;
the comparison module is used for comparing a first temperature corresponding to the temperature verification position with a second temperature at a preset position of the temperature sensor under the conditions of a high-temperature working condition and a low-temperature working condition of the battery pack;
and the second determining module is used for determining the layout position of the temperature sensor based on the preset position of the temperature sensor 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 partially exceeds a first temperature threshold, 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 partially exceeds a second temperature threshold.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
The embodiment of the invention provides a method and a device for determining the position of a temperature sensor of a battery pack and electronic equipment, determining a temperature verification position of the battery pack by predicting a temperature high point and a temperature low point of the battery pack, checking a preset position of a temperature sensor in the battery pack based on the temperature verification position, comparing the first temperature of the temperature verification position under the high-temperature working condition and the low-temperature working condition with the second temperature of the preset position of the temperature sensor, if the first temperature higher than the second temperature and exceeding the first temperature threshold does not exist under the high-temperature working condition, and the first temperature lower than the second temperature and exceeding the second temperature threshold value does not exist under the low-temperature working condition, the arrangement of the temperature sensors can be determined according to the current preset position of the temperature sensors, the highest point and the lowest point of the battery pack in the using process can be determined according to the arrangement position, and the use safety and reliability of the battery pack can be guaranteed.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for determining a location of a battery pack temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a test condition of a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic temperature diagram 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;
fig. 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;
fig. 5 is a schematic layout view of a temperature sensor of a battery pack module according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an arrangement of temperature sensors of another battery pack module according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a temperature rise curve of a corresponding overall process under a working condition according to an embodiment of the present invention;
FIG. 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 an overall temperature rise curve corresponding to a second operating condition according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a temperature difference curve corresponding to a second operating condition according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a temperature rise curve in the whole process corresponding to the third operating condition according to the embodiment of the present invention;
FIG. 12 is a schematic diagram of a temperature difference curve corresponding to a third operating condition according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a temperature rise curve of the whole process corresponding to the working condition four according to the embodiment of the present invention;
fig. 14 is a schematic diagram of a temperature difference curve corresponding to a working condition four according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of a temperature rise curve of the whole process corresponding to the working condition five according to the embodiment of the present invention;
FIG. 16 is a schematic diagram of a temperature difference curve corresponding to a fifth operating condition according to an embodiment of the present invention;
fig. 17 is a functional block diagram of an apparatus for determining a location of a temperature sensor of a battery pack according to 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 Description
To make the objects, 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, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Two temperature sensors preset in each module in the current battery pack may not collect the lowest temperature or the highest temperature of the battery pack in the actual application process, that is, the battery pack has a lower temperature or a higher temperature than that collected by the current temperature sensor.
In practical application, in a high-temperature working condition, a thermal management strategy or a charge-discharge strategy is generally executed according to the highest collection temperature of the battery pack; and in a low-temperature working condition, executing a thermal management strategy or a charge-discharge strategy according to the lowest acquisition temperature of the battery pack. At this time, the control is performed only according to the temperature collected by the current sensor, which may cause errors in thermal management and charge-discharge control, and further affect the safety of the battery pack.
Based on this, according to the method and the device for determining the position of the temperature sensor of the battery pack and the electronic device provided by the embodiment of the invention, the accurate position of the sensor, which can acquire the highest temperature of the battery pack under the high-temperature working condition and the lowest temperature of the battery pack under the low-temperature working condition, is determined by checking the arrangement position of the temperature sensor.
In order to facilitate understanding of the embodiment, a detailed description is first given of a method for determining a position of a battery pack temperature sensor disclosed in the embodiment of the present invention, and the method can be applied to intelligent devices such as an upper computer, a server, a controller, and the like.
Fig. 1 is a flowchart of a method for determining a location of a battery pack temperature sensor according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
and step S102, 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.
The predicted temperature high point and the predicted temperature low point are respectively position points which are possibly higher or lower than the temperature collected by the temperature sensor at the preset position in the battery pack under the high-temperature working condition and the low-temperature working condition; as an alternative embodiment, the locations of the predicted temperature high point and the predicted temperature low point may be used as the temperature verification locations of the battery pack.
And step S104, respectively comparing the first temperature corresponding to the temperature verification position with the second temperature of the preset position of the temperature sensor under the high-temperature working condition and the low-temperature working condition of the battery pack.
The battery pack comprises a high-temperature working condition and a low-temperature working condition, and under the two working conditions, a first temperature at a predicted temperature high point and a predicted temperature low point can be compared with a second temperature acquired by a preset position sensor.
And S106, 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 part of the first temperature threshold, 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 part of the first temperature threshold and is higher than the second temperature threshold, determining the layout position of the temperature sensors based on the preset position of the temperature sensors.
It can be understood that if under the high temperature working condition and the low temperature working condition, the second temperature collected by the temperature sensor at the preset position is the highest temperature or the lowest temperature all the time, the preset position of the temperature sensor is considered to be more accurate, and the temperature sensor can be installed and arranged based on the preset position.
In a preferred embodiment of practical application, a temperature verification position of a battery pack is determined by predicting a temperature high point and a temperature low point of the battery pack, a preset position of a temperature sensor in the battery pack is checked based on the temperature verification position, namely, a first temperature of the temperature verification position under a high-temperature working condition and a second temperature of the preset position of the temperature sensor are compared, if a first temperature higher than the second temperature and exceeding a first temperature threshold does not exist under the high-temperature working condition and a first temperature lower than the second temperature and exceeding a second temperature threshold does not exist under the low-temperature working condition, the arrangement of the temperature sensor can be determined according to the current preset position of the temperature sensor, the arrangement position can determine the highest point and the lowest point in the use process of the battery pack, and the use safety and reliability of the battery pack can be guaranteed.
In some embodiments, if the first temperature of the temperature verification position exceeds the second temperature of the temperature sensor preset position by a temperature threshold value at any time of the battery pack under the high-temperature condition or the low-temperature condition, the temperature sensor preset position needs to be adjusted to meet the use safety of the battery pack, specifically, the method further includes:
step 1.1), if the first temperature corresponding to the temperature verification position is higher than the second temperature and exceeds a first temperature threshold under the high-temperature working condition, or the first temperature corresponding to the temperature verification position is lower than the second temperature and exceeds a second temperature threshold under the low-temperature working condition, adjusting the preset position of the temperature sensor, and comparing the first temperature corresponding to the temperature verification position with the third temperature of the adjusted preset position of the temperature sensor until the arrangement position of the temperature sensor is determined.
As an alternative embodiment, the high-temperature condition may include a charge-discharge cycle condition, a constant-power discharge condition, a high-temperature exposure condition, and the like, and there are three conditions in the relationship between the preset position Tmax and the non-NTC position (temperature verification position) Tmax of the temperature sensor (NTC):
A. if the NTC preset position Tmax is larger than the non-NTC position Tmax, the maximum temperature of the battery cell can be acquired by the NTC preset arrangement position in the working condition; the preset position of the temperature sensor can be used as a 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 ℃ (the first temperature threshold), the NTC preset arrangement position is considered to be capable of acquiring the highest temperature of the battery cell in the working condition; the preset position of the temperature sensor can be used as the layout position;
the acquisition error of a single NTC is +/-0.5 ℃, the difference value of the acquisition error and the difference value is a first temperature threshold value 1 ℃, namely the first temperature threshold value can be set according to the acquisition error of a single temperature sensor, so that the reliability of the battery pack is ensured.
C. If the NTC preset position Tmax is smaller than the non-NTC position Tmax and the difference is larger than 1 ℃ (the second temperature threshold), the NTC arranged at the preset position cannot acquire the highest temperature of the battery cell in the working condition, and the NTC position of the module group is reselected according to the test result.
It is understood that the second temperature threshold may be equal to the first temperature threshold.
Based on the foregoing embodiment, as another alternative embodiment, the low-temperature condition may include low-temperature exposure, low-temperature heating, and so on, and there are three cases of the size relationship between the NTC preset position Tmin and the non-NTC position (temperature verification position) Tmin:
D. if the NTC preset position Tmin is smaller than the non-NTC position Tmin, the situation shows that the lowest temperature of the battery cell can be acquired by the NTC currently arranged preset position in the working condition, and the temperature sensor can be installed according to the preset position;
E. if the NTC preset position Tmin is slightly larger than the non-NTC position Tmin and the difference is less than or equal to 1 ℃ (the first temperature threshold), the NTC preset position is considered to be capable of acquiring the lowest temperature of the battery cell in the working condition, and the temperature sensor can be installed according to the preset position;
F. if the NTC preset position Tmin is larger than the non-NTC position Tmin and the difference is larger than 1 ℃ (the second temperature threshold), the NTC arranged at the preset position cannot acquire the lowest temperature of the battery cell in the working condition, and the NTC arrangement position of the module is reselected according to the test result.
In some embodiments, since the battery pack may involve high-temperature conditions and low-temperature conditions, there may be some components that affect the temperature of the temperature sensor, and the influence of the components is analyzed to predict the high temperature point and the low temperature point that may exist in the battery; illustratively, step S102 includes:
and 2.1) determining key components in the battery pack according to influences of the components in the battery pack on temperature acquisition of a temperature sensor at a preset position under high-temperature working conditions and low-temperature working conditions.
The key components are components which have large influence on the temperature acquisition of the temperature sensor at the preset position, and can comprise long copper bars, end plates, water cooling plates and the like.
According to the influence of the long copper bar and the end plate in fig. 3 and the influence of the water flow of the water cooling plate in fig. 4, the positions where the cell temperature is abnormal, such as the edge position of the cell module, under the high-temperature working condition or the low-temperature working condition are marked by rectangular frames; under the high-temperature working condition, the temperatures of the long copper bar and the end plate are higher and are influenced by the heating of the upper water cooling plate and the copper bar, and the temperature of the battery cell connected with the long copper bar is higher under the influence of thermal radiation, namely, the temperature of the edge position of the battery cell module marked by the rectangular frame is higher, and the temperature of the side of the water outlet is higher; under the low-temperature working condition, the end plate is connected with the lower box body, the temperature of the battery cell connected with the end plate is low, and the battery cell can be guided to the shell through the heat of the end plate, namely, the battery cell is close to the end plate and the external environment, and the temperature of the battery cell position marked by the rectangular frame is low; the temperature of the battery core at the water outlet side is lower.
And 2.2) determining a predicted temperature high point and a predicted temperature low point of the battery pack according to influences caused by key components in the battery pack.
Here, the point at which the temperature rises under the influence of the critical component is referred to as the predicted temperature high point, and conversely, the predicted temperature low point.
And 2.3) determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
The predicted temperature high point and the predicted temperature low point can be used as temperature verification positions, 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, a high temperature point and a low temperature point which may exist in the battery can be predicted through a simulation model of the battery module; exemplarily, step S102 further includes:
and 3.1) establishing a simulation model of the battery module according to the temperature parameters of the battery pack.
The temperature parameters can include inlet water temperature, heat exchange boundary conditions, ambient temperature, natural convection heat exchange coefficient and the like, and a simulation model of each module in the battery pack can be established based on the temperature parameters.
And 3.2) determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the simulation model.
Here, the temperature of each point of the module can be known based on the temperature cloud chart output by the simulation model, and a predicted temperature high point and a predicted temperature low point are selected.
And 3.3) determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
It should be noted that each battery pack includes a plurality of modules, and in order to prevent thermal runaway of the modules and detect the influence deviation of the thermal runaway as soon as possible, each module includes two preset positions of the temperature sensor. In practical applications, the battery pack in the embodiment of the present invention has twenty-four modules, each module is provided with an NTC at each of the middle position and the outer edge position, i.e., forty-eight preset positions of the common temperature sensor of the battery pack, such as T1-T48, and twelve predicted temperature high points and twelve predicted temperature low points determined by the previous embodiment, as shown in fig. 5 and 6.
In some embodiments, the first temperature of the temperature verification position in the whole process of the battery pack application needs to be compared with the second temperature of the preset position of the temperature sensor to ensure the application reliability of the battery pack, and step S104 may be further implemented by the following steps, specifically including:
and 4.1) arranging a temperature sensor at each temperature verification position to acquire a first temperature.
The temperature at each temperature verification position can be acquired by arranging a sensor at the position, and the arrangement position (temperature verification position) of the temperature sensor is shown as a black bold rectangle in fig. 6.
It should be noted that, the positions 1, 2, 3, 8, 10, and 12 shown by the black thickened rectangular square frame are influenced by the long copper bar under the high-temperature working condition, and the temperature is higher; under the low-temperature working condition, the temperature is close to the end plate and the external environment and is lower; positions 4 and 5 shown by the black thickened rectangular boxes are influenced by the heat generated by the upper water-cooling plate and the copper bar under the high-temperature working condition, and the temperature is higher; positions 6, 7, 9 and 11 shown by the black thickened rectangular frame are influenced by the side of the water outlet under the high-temperature working condition, and the temperature is higher; under the low-temperature working condition, the temperature is lower under the influence of the water outlet side.
And 4.2) comparing the highest first temperature in the temperature verification positions with the highest second temperature in the preset positions of the temperature sensor under the high-temperature working condition of the battery pack.
It will be appreciated that in order to know whether the preset position of the temperature sensor can capture the maximum temperature under high temperature conditions, the maximum temperature in the first temperature is compared with the maximum temperature in the second temperature.
And 4.3) comparing the lowest first temperature in the temperature verification positions with the lowest second temperature in the preset positions of the temperature sensor under the low-temperature working condition of the battery pack.
The low-temperature working condition and the high-temperature working condition are the same, and are not described herein again.
In some embodiments, if the preset position of the temperature sensor in step 1.1) of the foregoing embodiments does not acquire the highest temperature or the lowest temperature in the application process of the battery pack, the preset position of the temperature sensor may be adjusted, which specifically includes:
step 5.1), if the first temperature corresponding to the temperature verification position is higher than the second temperature and is higher than a part of the first temperature and is larger than a first temperature threshold value under the high-temperature working condition, determining key components of the battery pack, which influence the temperature acquisition of the temperature sensor under the high-temperature working condition; redesigning, re-selecting or adjusting key components in the battery pack.
If the high-temperature working condition exists, the high-point temperature which cannot be acquired by the temperature sensor at the preset position exists, and the additional heat source (key component) which possibly influences the temperature of the battery cell, such as a relay and a copper bar, is redesigned or reselected.
Step 5.2), if the first temperature corresponding to the temperature verification position is lower than the second temperature and the lower part of the first temperature is larger than a second temperature threshold value under the low-temperature working condition, determining key components of the battery pack which influence the temperature acquisition of the temperature sensor under the low-temperature working condition; redesigning, re-selecting or adjusting key components in the battery pack.
If the low-point temperature which cannot be acquired by the temperature sensor at the preset position exists under the low-temperature working condition, the key components which possibly influence the temperature of the battery core, such as a liquid cooling system, are redesigned or reselected.
In some embodiments, after the adjustment for the key component in the foregoing steps 5.1) -5.2), there is still a low temperature point or a high temperature point that cannot be acquired by the temperature sensor in the predicted position, the adjusting the preset position of the temperature sensor may further include:
and 6.1) replacing the positive electrode and the negative electrode of each module in the battery pack.
As shown in fig. 6, it can be seen that each module includes a positive electrode and a negative electrode, and the adjustment can be performed in a manner that the original positive electrode is replaced by the negative electrode and the negative electrode is replaced by the positive electrode, and the first temperature and the second temperature of the adjusted module are compared again.
Or,
and 6.2) if a temperature verification position higher than the second temperature and partially higher than the first temperature threshold exists under the high-temperature working condition, or if a temperature verification position lower than the second temperature and partially higher than the second temperature threshold exists under the low-temperature working condition, taking the central position of the target module where the temperature sensor preset position with abnormal temperature is located as a reference point, and symmetrically adjusting the temperature sensor preset position of the target module.
Taking the module where the temperature sensors T13 and T14 are located as an example for explanation, the current T14 is disposed on the bottom side of the module, and the T13 is disposed on the right side of the module; if there is a temperature anomaly in the module under high or low temperature conditions, the positions of the temperature sensors T13 and T14 can be adjusted symmetrically with respect to the center position G of the module as a reference point, such as T14 on the top side of the module, T13 on the left side of the module, and so on.
It can be understood that the preset position of the temperature sensor can be adjusted by adopting the adjusting mode of the steps until the comparison condition of the first temperature of the temperature verification position of the adjusted module and the second temperature of the preset temperature position meets the requirement, and the arrangement position of the temperature sensor, at which the predicted temperature high point and the predicted temperature low point can be collected, is determined.
The embodiment of the invention can ensure that the NTC can accurately acquire the temperature of the battery at any time of various working conditions of the battery, namely the highest temperature of the battery pack can be acquired under the high-temperature working condition and the lowest temperature can be acquired under the low-temperature working condition, thereby ensuring the reliability of the battery thermal management and charge-discharge control strategy.
In some embodiments, in order to ensure that the temperature sensor position determining method provided in the above embodiments has the effect Of accurately acquiring the battery temperature at any time, that is, the highest temperature Of the battery pack can be acquired in the high-temperature condition and the lowest temperature can be acquired in the low-temperature condition, the test is performed according to the product Specification Requirements (sor) issued by the customer on the supplier under five test conditions shown in fig. 2.
The working condition I is as follows: a 35KW discharge + charge cycle condition, as can be seen from the temperature rise curve in the whole process shown in fig. 7, in the whole process of the discharge and charge cycle, the NTC position Tmax is greater than the non-NTC position Tmax, which indicates that the arrangement position of the NTC can acquire the highest temperature of the battery cell in this condition; and comparing the NTC position Tmax with the non-NTC position Tmax to obtain a temperature difference curve of the NTC position Tmax and the non-NTC position Tmax, wherein the temperature difference curve is shown in FIG. 8, and the NTC can acquire the highest temperature of the battery cell under the discharge and charge cycle working condition.
Working condition 2: under the 61.5KW discharging condition, comparing the NTC position Tmax with the non-NTC position Tmax according to the whole process temperature rise curve shown in FIG. 9, and obtaining a temperature difference curve of the two positions as shown in FIG. 10.
In the whole process of 61.5KW discharge, the Tmax at the NTC position in the early stage of discharge is slightly smaller than the Tmax at the non-NTC position, the difference is less than 0.4 ℃, and the difference is considered to be reasonable when the difference is less than or equal to 1 ℃ because the acquisition error of NTC is +/-0.5 ℃ and the error of temperature difference is +/-1 ℃; and in the later discharging period, the NTC position Tmax is larger than the non-NTC position Tmax, which shows that the maximum temperature of the battery cell can be acquired by the arrangement position of the NTC in the working condition.
Therefore, under the 61.5KW discharge working condition, the NTC can acquire the highest temperature of the battery cell.
Working conditions are as follows: under the high-temperature exposure condition, according to the temperature rise curve in the whole process shown in fig. 11, in the whole discharge and charge cycle process, the NTC position Tmax is greater than the non-NTC position Tmax, which indicates that the arrangement position of the NTC can acquire the highest temperature of the battery cell under the condition. Comparing the NTC position Tmax with the non-NTC position Tmax to obtain a temperature difference curve, as shown in fig. 12. Therefore, under the high-temperature exposure working condition, the NTC can acquire the highest temperature of the battery core.
Working conditions are as follows: under the low-temperature exposure condition, according to the whole-process temperature rise curve shown in fig. 13, in the whole low-temperature exposure process, the NTC position Tmin at the early stage is less than the non-NTC position Tmin, the NTC position Tmin at the later stage is slightly greater than the non-NTC position Tmin, and the difference is not less than 0.2 ℃. Comparing the NTC position Tmin with the non-NTC position Tmin to obtain a temperature difference curve of the two positions, as shown in fig. 14, it is indicated that the arrangement position of the NTC can acquire the lowest temperature of the battery cell in this working condition, that is, the NTC can acquire the lowest temperature of the battery cell in the low-temperature exposure working condition.
Working condition five: under the low-temperature heating condition, according to the temperature rise curve in the whole process shown in fig. 15, in the whole low-temperature heating process, the NTC position Tmin is less than the non-NTC position Tmin, which indicates that the arrangement position of the NTC can acquire the lowest temperature of the battery cell in the working condition. Comparing the NTC position Tmin with the non-NTC position Tmin to obtain a temperature difference curve of the two, as shown in fig. 16, that is, under the low-temperature heating condition, the NTC can acquire the lowest temperature of the battery cell.
As shown in fig. 17, an embodiment of the present invention further provides an apparatus 200 for determining a location of a battery pack temperature sensor, where the apparatus includes:
the first determining module 201 determines 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;
the comparison module 202 is used for comparing a first temperature corresponding to the temperature verification position with a second temperature of a preset position of the temperature sensor under the conditions of a high-temperature working condition and a low-temperature working condition of the battery pack;
and a second determining module 203, configured to determine the layout position of the temperature sensor based on a preset position of the temperature sensor if the first temperature corresponding to the temperature verification position is not higher than the second temperature and exceeds a first temperature threshold under the high-temperature working condition, and the first temperature corresponding to the temperature verification position is not lower than the second temperature and exceeds a second temperature threshold under the low-temperature working condition.
In some embodiments, the second determining module 203 is further specifically configured to, if the first temperature corresponding to the temperature verification position is higher than the second temperature and exceeds a first temperature threshold under a high-temperature working condition, or the first temperature corresponding to the temperature verification position is lower than the second temperature and exceeds a second temperature threshold under a low-temperature working condition, 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 until the arrangement position of the temperature sensor is determined.
In some embodiments, the second determining module 203 is further specifically configured to determine, if the first temperature corresponding to the temperature verification position is higher than the second temperature and partially higher than a first temperature threshold value under the high-temperature operating condition, a critical component of the battery pack, which affects temperature acquisition by the temperature sensor, under the high-temperature operating condition; redesigning, re-selecting or adjusting 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 of the first temperature is larger than a second temperature threshold value under the low-temperature working condition, determining that the temperature of the temperature sensor is influenced by key components of the battery pack under the low-temperature working condition; redesigning, re-selecting or adjusting key components in the battery pack.
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 the temperature verification position higher than the second temperature and partially higher than the first temperature threshold exists under the high-temperature working condition, or if the temperature verification position lower than the second temperature and partially higher than the second temperature threshold exists under the low-temperature working condition, the central position of the target module where the temperature sensor preset position with abnormal temperature is located is used as a reference point, and the temperature sensor preset position of the target module is symmetrically adjusted.
In some embodiments, the first determining module 201 is further specifically configured to determine a key component in the battery pack according to an influence of each component in the battery pack on temperature acquisition of a temperature sensor at a preset position under a high-temperature working condition and a low-temperature working condition; determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the influence caused by key components in the battery pack; determining a temperature verification location for the battery pack based on the predicted temperature high point and the predicted temperature low point for the battery pack.
In some embodiments, the first determining module 201 is further specifically configured to establish a simulation model of the battery module according to the temperature parameter of the battery pack; determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the simulation model; determining a temperature verification location for the battery pack based on the predicted temperature high point and the predicted temperature low point for the battery pack.
In some embodiments, the comparing module 202 is further specifically configured to set a temperature sensor at each of the temperature verification locations to acquire a first temperature; under the condition 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; and under the condition of the low-temperature working condition of the battery pack, comparing the lowest first temperature in the temperature verification position with the lowest second temperature in the preset position of the temperature sensor.
Fig. 18 is a schematic hardware architecture diagram of an electronic device 300 according to an embodiment of the present invention. Referring to fig. 18, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may further include a non-volatile storage medium 303, a communication interface 304, and a bus 305; the machine-readable storage medium 301, the processor 302, the nonvolatile storage medium 303, and the communication interface 304 communicate with each other via a bus 305. The processor 302 may perform the method of determining the location of the battery pack temperature sensor described in the above embodiments by reading and executing machine executable instructions of the determination of the location of the battery pack temperature sensor in the machine readable storage medium 301.
A machine-readable storage medium as referred to herein may 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: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, 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 step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program, and when executed, the computer program code may implement the method for determining a position of a temperature sensor of a battery pack according to any of the embodiments described above, and specific implementation may refer to the method embodiments, which are not described herein again.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working process of the system and the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method of determining a location of a battery pack temperature sensor, the method comprising:
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;
under the conditions of a high-temperature working condition and a low-temperature working condition of the battery pack, respectively comparing a first temperature corresponding to the temperature verification position with a second temperature of a preset position of a temperature sensor;
and if the first temperature corresponding to the temperature verification position is not higher than the second temperature and is higher than a part of the first temperature threshold value under the high-temperature working condition, and the first temperature corresponding to the temperature verification position is not lower than the second temperature and is lower than the part of the first temperature threshold value and is higher than the second temperature threshold value under the low-temperature working condition, determining the layout position of the temperature sensors based on the preset position of the temperature sensors.
2. The method of claim 1, further comprising:
and if the first temperature corresponding to the temperature verification position is higher than the second temperature and is higher than a part of the first temperature threshold value under the high-temperature working condition, or the first temperature corresponding to the temperature verification position is lower than the second temperature and is lower than the part of the first temperature threshold value, 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 under the low-temperature working condition until the arrangement position of the temperature sensor is determined.
3. The method of 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 partially higher than a first temperature threshold value under the high-temperature working condition, determining that the temperature of the temperature sensor is influenced by key components of the battery pack under the high-temperature working condition; redesigning, re-selecting or adjusting 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 of the first temperature is larger than a second temperature threshold value under the low-temperature working condition, determining that the temperature of the battery pack acquired by the temperature sensor is influenced under the low-temperature working condition; redesigning, re-selecting or adjusting key components in the battery pack.
4. The method of claim 3, wherein the step of adjusting the preset position of the temperature sensor further comprises:
replacing the positive electrode and the negative electrode of each module in the battery pack;
or,
if the temperature verification position higher than the second temperature and partially higher than the first temperature threshold exists under the high-temperature working condition, or if the temperature verification position lower than the second temperature and partially higher than the second temperature threshold exists under the low-temperature working condition, the central position of the target module where the temperature sensor preset position with abnormal temperature is located is used as a reference point, and the temperature sensor preset position of the target module is symmetrically adjusted.
5. The method of claim 1, wherein the step of determining the temperature verification location of the battery pack based on the predicted high temperature point and the predicted low temperature point of the battery pack comprises:
determining key components in the battery pack according to influences of the components in the battery pack on temperature acquisition of a temperature sensor at a preset position under high-temperature working conditions and low-temperature working conditions;
determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the influence caused by key components in the battery pack;
and determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
6. The method of claim 1, wherein the step of determining the temperature verification location of the battery pack based on the predicted high temperature point and the predicted low temperature point of the battery pack comprises:
establishing a simulation model of the battery module according to the temperature parameter of the battery pack;
determining a predicted temperature high point and a predicted temperature low point of the battery pack according to the simulation model;
and determining the temperature verification position of the battery pack based on the predicted temperature high point and the predicted temperature low point of the battery pack.
7. The method according to claim 1, wherein 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 under the high-temperature working condition and the low-temperature working condition of the battery pack respectively comprises:
arranging a temperature sensor at each temperature verification position to acquire a first temperature;
under 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;
and under the condition of the low-temperature working condition of the battery pack, comparing the lowest first temperature in the temperature verification position with the lowest second temperature in the preset position of the temperature sensor.
8. An apparatus for determining a location of a temperature sensor of a battery pack, the apparatus comprising:
the first determination module is used for 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;
the comparison module is used for comparing a first temperature corresponding to the temperature verification position with a second temperature at a preset position of the temperature sensor under the conditions of a high-temperature working condition and a low-temperature working condition of the battery pack;
and the second determining module is used for determining the layout position of the temperature sensor based on the preset position of the temperature sensor 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 partially exceeds a first temperature threshold, 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 partially exceeds a second temperature threshold.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.
10. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 7.
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