Temperature detection control method and device for new energy battery pack

Abstract

The invention relates to the technical field of batteries, in particular to a temperature detection control method and device for a new energy battery pack, and the method comprises the steps: obtaining the temperature control power of the new energy battery pack at the current moment; according to the current data at each moment, determining a change trend parameter of a current sequence formed by the current data at each moment; according to the temperature control power and the change trend parameter of the new energy battery pack at the current moment, determining the temperature control power of the new energy battery pack at the next moment; and determining an opening degree index of a heat source output branch pipeline control valve of each cooling fin according to the temperature data of the battery pack. According to the invention, the temperature control power and the opening degree index at the next moment are adaptively determined, so that the influence of a current heat effect and uneven temperature distribution in the battery pack on temperature control can be overcome to a certain extent, and the accuracy of temperature detection control of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a temperature detection control method and device of new energy battery pack. BACKGROUND

[0002] The new energy battery pack refers to the battery pack used in new energy vehicles. The new energy battery pack is usually composed of multiple battery units, which can provide the required power for the vehicle. The main function is to store and release electric energy to drive the electric motor and then push the vehicle to move. When the battery pack works at a continuously high temperature, it may affect the service life and power supply efficiency of the battery, and even cause a fire accident due to uncontrolled battery. Therefore, the temperature detection and control of the new energy battery pack is particularly important.

[0003] In the prior art, when the temperature of the new energy battery pack is controlled, the internal temperature is monitored according to the temperature detection device arranged inside the new energy battery pack. When the monitored battery temperature reaches the preset temperature range of the heat dissipation system, heat dissipation treatment is performed. When the monitored battery temperature reaches the preset temperature range of the heating system, heating treatment is performed. However, in the battery pack temperature control process, the thermal effect of the current will affect the battery temperature to some extent. For example, when the battery pack is cooled, the current of the battery pack continuously increases, which will cause insufficient cooling of the battery and reduce the overall cooling efficiency. At the same time, due to the influence of the position and material of the parallel battery pack inside the battery pack, the temperature distribution uniformity of the battery pack at different positions may be low, which will also affect the battery temperature to some extent, for example, the local temperature control effect of the battery pack is low. Therefore, the existing temperature detection control method of the battery pack is affected by the thermal effect of the current and the poor temperature distribution uniformity inside the battery pack, and the temperature detection control accuracy of the new energy battery pack is low. SUMMARY

[0004] In order to solve the above-mentioned technical problem of low temperature detection control accuracy of the existing new energy battery pack, the purpose of the present application is to provide a temperature detection control method and device of new energy battery pack, and the technical scheme adopted is as follows:

[0005] One embodiment of the present application provides a temperature detection control method and device of new energy battery pack, which comprises the following steps:

[0006] Obtain the temperature control power of the new energy battery pack at the current time, which is used to control the internal temperature of the new energy battery pack;

[0007] Obtain the current data of the current period of the new energy battery pack in the running process; according to the current data of each time, determine the change trend parameter of the current sequence composed of the current data of each time.

[0008] determining the temperature control power of the new energy battery pack at the next moment according to the temperature control power of the new energy battery pack at the current moment and the change trend parameter, the next moment referring to the next moment of the current moment;

[0009] determining the opening degree index of the heat source output branch pipeline control valve of each heat dissipation fin according to the temperature data of the battery groups on both sides of each heat dissipation fin in the new energy battery pack at the current moment;

[0010] combining the temperature control power and the opening degree index, performing temperature detection control on the new energy battery pack at the next moment.

[0011] Further, the determining of the opening degree index of the heat source output branch pipeline control valve of each heat dissipation fin according to the temperature data of the battery groups on both sides of each heat dissipation fin in the new energy battery pack at the current moment comprises:

[0012] obtaining the temperature data of the battery groups on both sides of each heat dissipation fin in the new energy battery pack at the current moment;

[0013] determining the heat dissipation flow index of each heat dissipation fin at the next moment according to the temperature data of the battery groups on both sides of each heat dissipation fin;

[0014] determining the opening degree index of the heat source output branch pipeline control valve of each heat dissipation fin based on the heat dissipation flow index.

[0015] Further, the determining of the heat dissipation flow index of each heat dissipation fin at the next moment according to the temperature data of the battery groups on both sides of each heat dissipation fin comprises:

[0016] for any heat dissipation fin, calculating the absolute value of the temperature mean value of the battery groups on both sides of the heat dissipation fin;

[0017] taking the ratio of the absolute value to the battery temperature comprehensive value as the heat dissipation flow index of the heat dissipation fin at the next moment;

[0018] wherein the battery temperature comprehensive value is equal to the cumulative value of the absolute values of the temperature mean values of all the battery groups on both sides of the heat dissipation fin.

[0019] Further, the obtaining of the temperature control power of the new energy battery pack at the current moment comprises:

[0020] obtaining the temperature data of each battery group in the new energy battery pack at the current moment;

[0021] determining the temperature control factor of the new energy battery pack at the current moment according to the temperature data of each battery group and a battery temperature reference value;

[0022] The product of the absolute value of the temperature control factor and a preset power conversion hyperparameter is taken as the temperature control power of the new energy battery pack at the current moment.

[0023] Further, the temperature control factor of the new energy battery pack at the current moment is determined according to the temperature data of each battery pack and a battery temperature reference value, and the temperature control factor of the new energy battery pack at the current moment comprises:

[0024] The maximum temperature value and the minimum temperature value of the battery pack during normal operation are obtained, and the average value of the maximum temperature value and the minimum temperature value is taken as the battery temperature reference value;

[0025] The ratio of the temperature data of each battery pack to the battery temperature reference value is calculated, and the average value of all the ratios is taken as an initial temperature control factor;

[0026] The initial temperature control factor is subtracted by 1 to obtain a first difference value, and the first difference value is taken as the temperature control factor of the new energy battery pack at the current moment.

[0027] Further, the change trend parameter of the current sequence composed of the current data of each moment is determined according to the current data of each moment, and the change trend parameter of the current sequence composed of the current data of each moment comprises:

[0028] For all adjacent current data, the current data of the next moment is subtracted from the current data of the previous moment to obtain a second difference value;

[0029] The average value of all the second difference values is calculated, and the average value of all the second difference values is taken as the change trend parameter of the current sequence.

[0030] Further, the temperature control power of the new energy battery pack at the next moment is determined according to the temperature control power of the new energy battery pack at the current moment and the change trend parameter, and the temperature control power of the new energy battery pack at the next moment comprises:

[0031] The absolute value of the change trend parameter is determined, and a normalized value is obtained by normalizing the absolute value of the change trend parameter; the product of the normalized value and the temperature control power of the new energy battery pack at the current moment is taken as a power adjustment value;

[0032] The temperature control power of the new energy battery pack at the next moment is obtained by adjusting the temperature control power of the new energy battery pack at the current moment by using the power adjustment value in combination with the attribute of the temperature control power at the current moment and the positive and negative situation of the change trend parameter.

[0033] Further, the attribute of the temperature control power at the current time and the positive or negative case of the change trend parameter are combined, and the temperature control power of the new energy battery pack at the next time is obtained by adjusting the temperature control power of the new energy battery pack at the current time using the power adjustment value, including:

[0034] The attribute of the temperature control power is heating power and heat dissipation power.

[0035] When the attribute of the temperature control power is heating power, the change trend parameter is compared with 0.

[0036] When the change trend parameter is greater than 0, the difference between the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0037] When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current time is taken as the temperature control power of the new energy battery pack at the next time.

[0038] When the change trend parameter is less than 0, the sum of the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0039] Further, the temperature control power of the new energy battery pack at the next time is obtained, further including:

[0040] When the attribute of the temperature control power is heat dissipation power, the change trend parameter is compared with 0.

[0041] When the change trend parameter is greater than 0, the sum of the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0042] When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current time is taken as the temperature control power of the new energy battery pack at the next time.

[0043] When the change trend parameter is less than 0, the difference between the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0044] A temperature detection control device of a new energy battery pack includes a processor and a memory, and the processor is used to process instructions stored in the memory to realize a temperature detection control method of a new energy battery pack.

[0045] The present application has the following advantages:

[0046] The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art and the advantages thereof, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0048] Figure 1 The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0049] Figure 2 The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0050] Figure 3 The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0051] Figure 4 The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0052] Figure 5 The present application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current time, then determines the change trend parameter of the current time period of the current, and combines the change trend parameter and the temperature control power of the new energy battery pack at the current time to determine the temperature control power of the new energy battery pack at the next time, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; according to the temperature data of the battery group on both sides of each heat sink in the new energy battery pack at the current time, the heat source output branch pipeline control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0053] The reference signs are explained as follows:

[0054] 1 is the battery temperature analysis and control main body, 2 is the heat source output pipeline, 3 is the heat source return pipeline, 4 is the first return branch pipeline, 5 is the second return branch pipeline, 6 is the third return branch pipeline, 7 is the first heat source output branch pipeline control valve, 8 is the second heat source output branch pipeline control valve, 9 is the third heat source output branch pipeline control valve, 10 is the first heat source output branch pipeline, 11 is the second heat source output branch pipeline, 12 is the third heat source output branch pipeline, 13 is the first parallel battery pack, 14 is the second parallel battery pack, 15 is the third parallel battery pack, 16 is the fourth parallel battery pack, 17 is the first heat sink, 18 is the second heat sink, 19 is the third heat sink, 20 is the temperature detection probe. DETAILED DESCRIPTION

[0055] In order to further illustrate the technical means and effects taken by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects of the technical solutions according to the present application are described in detail below in combination with the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0057] Embodiment one of a temperature detection control method for a new energy battery pack

[0058] The embodiment provides a temperature detection control method for a new energy battery pack, as shown in Figure 1 The embodiment provides a temperature detection control method for a new energy battery pack, as shown in

[0059] S1, acquiring the temperature control power of the new energy battery pack at the current time.

[0060] In the embodiment, the temperature control power is used to control the temperature condition inside the new energy battery pack. The properties of the temperature control power can be divided into heating power and heat dissipation power. The greater the heating power, the higher the temperature inside the battery pack will be. The greater the heat dissipation power, the lower the temperature inside the battery pack will be. Usually, the temperature control power is determined by the temperature condition of each battery pack in the real-time battery pack. Therefore, when determining the temperature control power at the current time, the temperature data of each battery pack at the current time can be used to determine the temperature control power. The specific implementation steps are realized by the following steps S11 to S13 (not shown in the figure):

[0061] S11, acquiring the temperature data of each battery pack in the new energy battery pack at the current time.

[0062] Specifically, the temperature detection probe arranged in each battery pack in the new energy battery pack is used to monitor the temperature of the surface of each battery pack in real time, so as to obtain the temperature data of each battery pack in the new energy battery pack at the current time. Each battery pack has its corresponding temperature data.

[0063] S12, determining the temperature control factor of the new energy battery pack at the current time according to the temperature data of each battery pack and the battery temperature reference value.

[0064] In this embodiment, the temperature control factor is an index obtained by quantifying the temperature condition of the new energy battery pack at the current time. The greater the temperature control factor, the worse the temperature condition inside the new energy battery pack at the current time, and the higher the necessity of temperature control. Specifically, the necessity of temperature control inside the new energy battery pack is analyzed according to the difference between the temperature data and the battery temperature reference value.

[0065] When the temperature data is much greater than the battery temperature reference value, it indicates that the temperature inside the battery pack is too high, and the battery pack needs to be cooled by determining the temperature control power to avoid serious accidents caused by high temperature of the battery pack. The necessity of temperature control is greater; when the temperature data is much less than the battery temperature reference value, it indicates that the temperature inside the battery pack is too low, which is not conducive to the charging and discharging operation of the battery pack, and the battery pack needs to be heated by determining the temperature control power. The necessity of temperature control is greater.

[0066] The above step S12 can be realized by the following steps S121 to S123 (not shown in the figure):

[0067] S121, obtaining the maximum temperature value and the minimum temperature value of the battery pack during normal operation, and taking the average value of the maximum temperature value and the minimum temperature value as the battery temperature reference value.

[0068] Specifically, first, set the temperature interval [T1, T2] of the new energy battery pack during normal operation, wherein T1 represents the minimum temperature value of the battery pack during normal operation, and T1 takes the experience value of 0 degrees; T2 represents the maximum temperature value of the battery pack during normal operation, and T2 takes the experience value of 25 degrees. The specific temperature interval during normal operation can be set according to actual needs, which is not limited. Then, the middle temperature value of the temperature interval is selected as the reference value, that is, the battery temperature reference value is equal to the average value of the maximum temperature value and the minimum temperature value.

[0069] Of course, the implementer can also determine the size of the battery temperature reference value by other ways, and the determination method of the battery temperature reference value is not limited, for example, the battery temperature reference value can be set artificially based on historical experience value.

[0070] S122, calculate the ratio of the temperature data of each battery pack to the battery temperature reference value, and take the average of all ratios as the initial temperature control factor.

[0071] S123, subtract 1 from the initial temperature control factor to obtain a first difference value, and take the first difference value as the temperature control factor of the new energy battery pack at the current moment.

[0072] As an example, the calculation formula of the temperature control factor of the new energy battery pack at the s-th moment can be:

[0073] In the formula, K s represents the temperature control factor of the new energy battery pack at the s-th moment, m represents the number of battery packs, r represents the serial number of the battery pack, T sr represents the temperature data of the r-th battery pack of the new energy battery pack at the s-th moment, T c represents the battery temperature reference value, represents the initial temperature control factor of the r-th battery pack of the new energy battery pack at the s-th moment, which can also be represented as the first difference value of the r-th battery pack of the new energy battery pack at the s-th moment.

[0074] In the calculation formula of the temperature control factor, represents the ratio of the temperature data of the r-th battery pack at the s-th moment to the battery temperature reference value, the larger the ratio, the larger the temperature data of the r-th battery pack relative to the battery temperature reference value, and the more power it may need to dissipate heat; The larger the first difference value, the greater the difference between the overall temperature of the new energy battery pack at the s-th moment and the battery temperature reference value, and the range value after subtracting 1 from the first difference value is equivalent to the range value of the battery pack temperature exceeding the normal temperature. The range value has the possibility of being a positive number or a negative number. When it is a positive number, the greater the heat dissipation power required by the battery pack, and when it is a negative number, the greater the heating power required by the battery pack.

[0075] Therefore, when the temperature control factor K s is greater than or equal to 1, the battery pack needs to be cooled; when the temperature control factor K s is less than -1, the battery pack needs to be heated; and when the temperature control factor K s is located in the interval (-1, 1), the battery pack inside the battery pack is not temperature controlled.

[0076] S13, take the product of the absolute value of the temperature control factor and the preset power conversion hyperparameter as the temperature control power of the new energy battery pack at the current moment.

[0077] In this embodiment, when controlling the battery pack temperature, the temperature control power of the new energy battery pack at the current moment can be obtained through the temperature control factor obtained in step S12. The temperature control factor can represent the power control status of the heating or cooling equipment.

[0078] As an example, the calculation formula for the temperature control power of the new energy battery pack at the sth moment can be:

[0079] P s =k×|K s |; Where, P s represents the temperature control power of the new energy battery pack at the sth moment, k represents the preset power conversion hyperparameter, k specifically refers to the hyperparameter of heating or cooling power conversion, the empirical value of the hyperparameter can be 3, || represents the absolute value function, K s Represents the temperature control factor.

[0080] In the calculation formula of temperature control power, when K s ≥1 for heat dissipation, when K s <-1, heating is performed; the specific size of the preset power conversion hyperparameter can be determined by the size of the battery pack and the power of the heating or cooling system; |K s | represents the absolute value of the temperature control factor of the battery pack at the sth moment, |K s The larger the value, the greater the power of the heating or cooling system when the control system regulates the battery temperature inside the battery pack.

[0081] It should be noted that the temperature control power determined by the battery pack temperature can have a real-time feedback effect. It can adjust the power size in real time according to the current battery pack temperature changes. For example, if the battery pack temperature drops at the current moment, the heat dissipation process may not continue, which can effectively save energy.

[0082] So far, this embodiment has obtained the temperature control power of the new energy battery pack at the current moment.

[0083] S2, obtaining the current data of the new energy battery pack at each moment during operation in the current period; and determining the change trend parameter of the current sequence composed of the current data at each moment based on the current data at each moment.

[0084] In the process of controlling the battery temperature, the heat effect of the current will have an impact on the battery temperature to some extent in the embodiment. For example, when heating or cooling the battery pack, in order to avoid the battery pack temperature from being cooled in time during the cooling process, it is necessary to increase the cooling power to some extent. When analyzing the heat effect of the current, it is necessary to determine the change trend parameter of the current sequence, and the change trend parameter is used to analyze the change trend of the current data of the battery pack at the current time. When the change trend parameter is greater than 0, it indicates that the current of the battery pack at the current time period is in an ascending state; when the change trend parameter is equal to 0, it indicates that the current of the battery pack at the current time period is in a stable state; and when the change trend parameter is less than 0, it indicates that the current of the battery pack at the current time period is in a descending state. The change trend parameter can be used to determine the temperature control power of the new energy battery pack at the next time.

[0085] The above step S2 can be implemented by the steps shown in the following table: Figure 2

[0086] S21, acquiring the current data of the new energy battery pack at each time during the running process of the current time period.

[0087] In the embodiment, the current time period refers to a time period composed of the current time and a plurality of times before the current time. The number of times in the current time period can be set to 10, and the implementer can set the current time period according to the actual situation. The current data of the new energy battery pack at each time during the running process of the current time period is collected, and the current data is also the working current of the new energy battery pack. The current data at each time is the reference data for subsequent analysis of the change trend parameter.

[0088] S22, for all adjacent time current data, subtracting the current data of the previous time from the current data of the next time to obtain a second difference value.

[0089] S23, calculating the average value of all second difference values, and taking the average value of all second difference values as the change trend parameter of the current sequence.

[0090] As an example, the calculation formula of the change trend parameter of the battery sequence can be:

[0091] In the formula, X n′ represents the change trend parameter of the current sequence of the current time period, g represents the number of current data in the current sequence, i represents the serial number of the current data, F n′(i+1) represents the current data at the i+1 time in the current sequence of the current time period, F n′i represents the current data at the i time in the current sequence of the current time period, and n' represents the current time period containing the current time.

[0092] ​In the calculation formula of the change trend parameter, each pair of current data in the current sequence is composed of the current data at the later time and the current data at the earlier time, the difference between each pair of current data is a negative value, that is, the change trend parameter of the battery sequence is less than zero, which indicates that the current data at the continuous time in the battery sequence generally presents a downward trend, and the absolute value of the change trend parameter can represent the downward amplitude; the difference between each pair of current data is a positive value, that is, the current data at the later time in the current sequence can be greater than the current data at the earlier time, which indicates that the current data at the continuous time in the battery sequence generally presents an upward trend, and the change trend parameter can represent the upward amplitude. The later time and the earlier time refer to two adjacent times.

[0093] At this point, the change trend parameter of the current period of the current sequence is obtained.

[0094] S3, determining the temperature control power of the new energy battery pack at the next time according to the temperature control power of the new energy battery pack at the current time and the change trend parameter.

[0095] In the embodiment, when the battery is heated or cooled, the working current of the battery pack will affect the control of the surface temperature of the battery pack. For example, when the battery is cooled or heated, the working current of the battery continuously increases, and the heat generated inside the battery pack also continuously increases, and vice versa. Therefore, when the battery pack is cooled, the working current of the battery continuously increases, and the cooling power at this time can be appropriately increased to avoid the situation that the cooling effect is poor due to the current heat effect, that is, to avoid the hidden danger caused by insufficient battery cooling; when the battery pack is heated, the working current of the battery continuously increases, and the heating power at this time can be appropriately reduced, and the current heat effect can be used to improve the surface temperature of the battery. The next time refers to the next time of the current time.

[0096] The above step S3 can be realized by the steps shown in the following table: Figure 3

[0097] S31, determining the absolute value of the change trend parameter, and obtaining a normalized value by normalizing the absolute value of the change trend parameter; and taking the product of the normalized value and the temperature control power of the new energy battery pack at the current time as the power adjustment value.

[0098] In the embodiment, the change trend parameter can be negative, so when the temperature control power is adjusted by using the change trend parameter, the absolute value of the change trend parameter needs to be obtained as the power adjustment amplitude. After obtaining the power adjustment amplitude, the power adjustment amplitude is normalized by using a linear normalization function, and the product of the normalized value and the temperature control power of the new energy battery pack at the current time is taken as the power adjustment value.

[0099] ​S32, in combination with the attribute of the temperature control power at the current time and the positive or negative situation of the change trend parameter, adjusting the temperature control power of the new energy battery pack at the current time by using the power adjustment value to obtain the temperature control power of the new energy battery pack at the next time.

[0100] In the embodiment, the attribute of the temperature control power is heating power and heat dissipation power. The adjustment mode of the temperature control power corresponding to different attributes of the temperature control power is different, so it needs to be divided into two cases to determine the temperature control power of the new energy battery pack at the next time.

[0101] Case one, when the attribute of the temperature control power is heating power, comparing the change trend parameter with 0.

[0102] When the change trend parameter is greater than 0, the difference between the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0103] When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current time is taken as the temperature control power of the new energy battery pack at the next time.

[0104] When the change trend parameter is less than 0, the sum of the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0105] The expression of the power adjustment during heating can be:

[0106] In the formula, P n+1 represents the heating power of the new energy battery pack at the next time, P n represents the heating power of the new energy battery pack at the current time, norm represents a linear normalization function, X n represents the change trend parameter of the current current sequence, P n Xnorm(X n ) and P n Xnorm(|X n |) are both power adjustment values of the heating power, || represents an absolute value function, n represents the current time, and n+1 represents the next time.

[0107] Case two, when the attribute of the temperature control power is heat dissipation power, comparing the change trend parameter with 0.

[0108] When the change trend parameter is greater than 0, the sum of the temperature control power of the new energy battery pack at the current time and the power adjustment value is taken as the temperature control power of the new energy battery pack at the next time.

[0109] When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current moment is used as the temperature control power of the new energy battery pack at the next moment.

[0110] When the change trend parameter is less than 0, the difference between the temperature control power of the new energy battery pack at the current moment and the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment.

[0111] The expression for power regulation during heat dissipation can be:

[0112] Where P′ n+1 Indicates the heat dissipation power of the new energy battery pack at the next moment, P′ n Indicates the heat dissipation power of the new energy battery pack at the current moment, P′ n ×norm(X n ) and P′ n ×norm(|X n |) are all power adjustment values ​​of heat dissipation power.

[0113] At this point, this embodiment can determine the power adjustment value of heating power or heat dissipation power by analyzing the influence of temperature control power and current thermal effect on temperature control at the current moment. Based on the power adjustment value, more accurate and reliable battery pack temperature detection and control can be achieved, which to a certain extent overcomes the defect of low efficiency of battery pack temperature control caused by current thermal effect, that is, it improves the accuracy of current pack temperature control.

[0114] S4, determining an opening degree index of a heat source output branch pipe control valve of each heat sink based on the temperature data of the battery packs on both sides of each heat sink in the new energy battery pack at the current moment.

[0115] In this embodiment, due to the influence of the position and material of the parallel battery packs in the battery pack, the temperature distribution uniformity of the battery packs at different positions may be low. For example, compared with the temperature heat dissipation of the battery packs at the edge of the battery pack, the temperature heat dissipation of the battery packs at the middle of the battery pack is relatively poor, and the battery temperature is relatively high. During the use of the battery pack, the temperature of the battery pack has a relatively important impact on its performance and service life. In order to better control the temperature of the battery packs inside the battery pack, it is necessary to determine the opening index of the heat source output branch pipe control valve based on the temperature data of the heat sink at different positions. Among them, the larger the opening index, the greater the flow rate of the thermal fluid flowing in the heat sink, and the better the heat dissipation effect.

[0116] The above step S4 can be Figure 4 The steps shown are implemented:

[0117] S41, acquire the temperature data of the battery groups on both sides of each heat sink in the new energy battery pack at the current time.

[0118] In this embodiment, the temperature detection probe is used to collect the temperature data of the battery groups on both sides of each heat sink in the new energy battery pack at the current time.

[0119] It should be noted that based on the temperature of the batteries on both sides of each heat sink, the heat dissipation flow index of the corresponding heat sink can be adaptively quantified. When the battery temperature is large, the heat dissipation flow index of the corresponding heat sink should be large, and vice versa.

[0120] S42, determine the heat dissipation flow index of each heat sink at the next time according to the temperature data of the battery groups on both sides of each heat sink.

[0121] In this embodiment, the temperature data of the battery groups and the heat dissipation flow are positively correlated. When the temperature data is larger, in order to avoid danger caused by high temperature, the flow of the heat conduction liquid of the heat sink should be larger; when the temperature data is smaller, in order to avoid unnecessary waste of resources, the flow of the heat conduction liquid of the heat sink should be smaller.

[0122] The above step S42 can be realized by steps S421 to S422:

[0123] S421, for any heat sink, calculate the absolute value of the temperature mean of the battery groups on both sides of the heat sink.

[0124] In this embodiment, the temperature data of the battery groups can be negative, so the temperature mean of the battery groups on both sides needs to be processed by taking the absolute value.

[0125] S422, take the ratio of the absolute value and the battery temperature comprehensive value as the heat dissipation flow index of the heat sink at the next time.

[0126] As an example, the calculation formula of the heat dissipation flow index of the heat sink at the next time can be:

[0127] q (n+1)u represents the heat dissipation flow index of the heat sink at the next time, represents the temperature mean of the battery groups on both sides of the u-th heat sink at the current time, || represents the absolute value function, and z represents the number of heat sinks, represents the battery temperature comprehensive value, which is equal to the cumulative value of the absolute values of the temperature means of the battery groups on both sides of all heat sinks, and the battery temperature comprehensive value in this embodiment does not consider the case of zero.

[0128] In the calculation formula of the heat dissipation flow index, the greater the heat dissipation flow index, the greater the flow of heat conduction liquid obtained by the corresponding heat dissipation fin, and the better the efficiency of battery heat dissipation; the heat dissipation flow index can be used to control the opening of the heat source output branch pipe control valve corresponding to the heat dissipation fin, and the greater the heat dissipation flow index, the greater the opening of the heat source output branch pipe control valve should be in order to ensure the heat dissipation requirement, so as to provide enough heat conduction liquid for the heat dissipation fin to dissipate heat for the battery pack. Among them, each heat dissipation fin has its corresponding heat dissipation flow index at the next moment.

[0129] S43, determine the opening degree index of the heat source output branch pipe control valve of each heat dissipation fin based on the heat dissipation flow index.

[0130] Specifically, the heat dissipation flow index is mapped to a value between 0 and 1 to obtain a mapped value, the mapped value is taken as the opening degree index, and it is specified that the heat source output branch pipe control valve is fully opened as 1 and half opened as 0.5; after obtaining the heat dissipation flow index, the control system controls the heat source output branch pipe control valve corresponding to the heat dissipation fin to open to a certain degree according to the opening degree index, and then circulates the heat conduction liquid to achieve heat dissipation of the battery pack.

[0131] Of course, the opening degree index can also adjust the opening degree of the valve through a PID (Proportion-Integral-Derivative) control algorithm. Specifically, according to the heat dissipation flow index, an appropriate control signal can be calculated to adjust the valve opening degree to achieve precise control. The implementation process of the PID control algorithm is prior art and is not within the protection scope of the present application, and will not be described in detail here.

[0132] It should be noted that the present embodiment adaptively controls the local temperature based on the actual temperature of the battery pack around the heat dissipation fin, which can effectively overcome the defect of different temperature distribution of the battery pack inside the battery pack and improve the overall heat dissipation efficiency.

[0133] S5, combine the temperature control power and the opening degree index to control the temperature detection of the new energy battery pack at the next moment.

[0134] In the present embodiment, after obtaining the temperature control power and the opening degree index at the next moment, the temperature detection control is performed according to the temperature control power and the opening degree index of the new energy battery pack at the next moment. The interval between the adjacent two moments can be set by the implementer according to the specific actual situation, for example, set to 30 seconds.

[0135] After the temperature detection control of the next moment is completed, the temperature data and the current data of the battery pack surface can be continuously collected, and the temperature control power and the opening degree index of the new energy battery pack at the next moment are determined according to the temperature detection control method of the new energy battery pack, so as to realize real-time and accurate detection control of the temperature of the new energy battery pack.

[0136] So far, the temperature detection control of the new energy battery pack is completed.

[0137] A second embodiment of a new energy battery pack temperature detection control device

[0138] The application provides a new energy battery pack temperature detection control device, which can include three modules, namely a data acquisition module, a heating and heat dissipation module and an analysis and control module, the data acquisition module is signal connected with the analysis and control module, and the analysis and control module is signal connected with the heating and heat dissipation module. The data acquisition module includes a current detection submodule and a temperature detection submodule.

[0139] A structure diagram of a new energy battery pack temperature detection control device is shown in Figure 5 The temperature control process of the new energy battery pack in the temperature detection control device is as follows:

[0140] Firstly, the current data and the temperature data of the battery pack during the working process are collected by using the current detection submodule built in the battery temperature analysis and control main body 1 and the temperature detection probe arranged in the middle of each parallel battery pack.

[0141] Secondly, the collected data is analyzed and calculated by using the analysis and control module in the battery temperature analysis and control main body 1, and based on the analysis result, the heating and heat dissipation module integrated in the battery temperature analysis and control main body 1 is used to control the circulating heat conduction liquid to perform heating or cooling treatment.

[0142] Then, the heat conduction liquid is transmitted through the heat source output pipeline 2, and then transmitted to the corresponding first heat dissipation fin 17, second heat dissipation fin 18 and third heat dissipation fin 19 through the first heat source output branch pipeline 10, second heat source output branch pipeline 11 and third heat source output branch pipeline 12, and the heat dissipation fin transmits the temperature of the liquid in the pipeline to the surrounding battery pack, so as to change the temperature of the battery pack.

[0143] Then, after the heat conduction liquid circulates through the first heat dissipation fin 17, the second heat dissipation fin 18 and the third heat dissipation fin 19, the first backflow branch pipeline 4, the second backflow branch pipeline 5 and the third backflow branch pipeline 6 connected with the outlet are used to converge into the heat source backflow pipeline 3.

[0144] Finally, the above temperature control steps are repeated to circulate the heat conduction liquid, so as to control the temperature of the battery.

[0145] It should be noted that the first heat source output branch pipe control valve 7, the second heat source output branch pipe control valve 8 and the second heat source output branch pipe control valve 9 are connected with the analysis and control module of the battery temperature analysis and control main body 1, and the opening degree of different valves is controlled to heat or cool the battery packs at different positions, which can solve the problem of uneven temperature distribution, so as to realize accurate temperature control of the first parallel battery pack 13, the second parallel battery pack 14, the third parallel battery pack 15 and the fourth parallel battery pack 16 in the battery pack.

[0146] The power of the integrated battery temperature heating and cooling module in the battery temperature analysis and control main body 1 and the opening degree of the first heat source output branch pipe control valve 7, the second heat source output branch pipe control valve 8 and the second heat source output branch pipe control valve 9.

[0147] Therefore, the temperature detection control device for the new energy battery pack provided in the embodiment is essentially a processor device realized by the internal temperature detection control method, and since the implementation process of the temperature detection control method has been described in detail in the above-mentioned temperature detection control method for the new energy battery pack embodiment one, it will not be repeated here.

[0148] The application provides a temperature detection control method and device for a new energy battery pack, which first acquires the temperature control power of the new energy battery pack at the current moment, then determines the change trend parameter of the current period current sequence, combines the change trend parameter and the temperature control power of the new energy battery pack at the current moment to determine the temperature control power of the new energy battery pack at the next moment, which improves the accuracy of battery temperature control and the energy efficiency ratio of the temperature detection control device; and the heat source output branch pipe control valve is controlled according to the temperature data of the battery packs on both sides of each heat dissipation fin in the new energy battery pack at the current moment, which to some extent overcomes the defect of uneven temperature distribution in the battery pack and improves the accuracy of temperature detection control.

[0149] The above-mentioned embodiments are only used to illustrate the technical solutions of the application, rather than limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not change the essence of the corresponding technical solutions out of the scope of the technical solutions of the embodiments of the application, and should be included in the protection scope of the application.

Claims

1. A temperature detection and control method for a new energy battery pack, characterized in that: The following steps are involved: Obtaining the temperature control power of the new energy battery pack at the current moment, where the temperature control power is used to control the internal temperature of the new energy battery pack; Obtain the current data of the new energy battery pack at each moment during operation in the current period; Determining, based on the current data at each moment, a change trend parameter of a current sequence composed of the current data at each moment; determining the temperature control power of the new energy battery pack at a next moment according to the temperature control power of the new energy battery pack at the current moment and the change trend parameter, where the next moment refers to a moment after the current moment; Determine the opening degree index of the heat source output branch pipe control valve of each heat sink based on the temperature data of the battery pack on both sides of each heat sink in the new energy battery pack at the current moment; In combination with the temperature control power and the opening degree index, the temperature of the new energy battery pack at the next moment is detected and controlled.

2. The temperature detection and control method of a new energy battery pack according to claim 1, characterized in that: The method of determining the opening degree index of the heat source output branch pipe control valve of each heat sink according to the temperature data of the battery packs on both sides of each heat sink in the new energy battery pack at the current moment includes: Get the temperature data of the battery pack on both sides of each heat sink in the new energy battery pack at the current moment; determining a heat dissipation flow index of each heat sink at a next moment according to the temperature data of the battery packs on both sides of each heat sink; The opening degree index of the heat source output branch pipeline control valve of each heat sink is determined based on the heat dissipation flow index.

3. The temperature detection and control method of a new energy battery pack according to claim 2, characterized in that: The step of determining the heat dissipation flow index of each heat sink at a next moment based on the temperature data of the battery packs on both sides of each heat sink comprises: For any heat sink, calculate the absolute value of the average temperature of the battery pack on both sides of the heat sink; The ratio of the absolute value to the comprehensive value of the battery temperature is used as the heat dissipation flow index of the heat sink at the next moment; The comprehensive battery temperature value is equal to the cumulative value of the absolute value of the average temperature of all battery packs on both sides of the heat sink.

4. The temperature detection and control method of a new energy battery pack according to claim 1, characterized in that: The obtaining of the temperature control power of the new energy battery pack at the current moment includes: Get the temperature data of each battery pack in the new energy battery pack at the current moment; Determining a temperature control factor of the new energy battery pack at a current moment according to the temperature data of each battery pack and a battery temperature reference value; The product of the absolute value of the temperature control factor and the preset power conversion hyperparameter is used as the temperature control power of the new energy battery pack at the current moment.

5. The temperature detection and control method of a new energy battery pack according to claim 4, characterized in that: The determining of the temperature control factor of the new energy battery pack at the current moment according to the temperature data of each battery pack and the battery temperature reference value includes: Obtaining a maximum temperature value and a minimum temperature value of the battery pack when the battery pack is operating normally, and taking an average of the maximum temperature value and the minimum temperature value as the battery temperature reference value; Calculating the ratio of the temperature data of each battery pack to the battery temperature reference value, and using the average of all ratios as the initial temperature control factor; Subtract 1 from the initial temperature control factor to obtain a first difference, and use the first difference as the temperature control factor of the new energy battery pack at the current moment.

6. The temperature detection and control method of a new energy battery pack according to claim 1, characterized in that: The step of determining, based on the current data at each moment, a change trend parameter of a current sequence composed of the current data at each moment, includes: For all current data at adjacent moments, subtract the current data at the previous moment from the current data at the next moment to obtain a second difference; An average value of all the second differences is calculated, and the average value of all the second differences is used as a change trend parameter of the current sequence.

7. The temperature detection and control method of a new energy battery pack according to claim 1, characterized in that: The determining the temperature control power of the new energy battery pack at a next moment according to the temperature control power of the new energy battery pack at the current moment and the change trend parameter includes: determining an absolute value of the change trend parameter, normalizing the absolute value of the change trend parameter to obtain a normalized value; and multiplying the normalized value by the temperature control power of the new energy battery pack at a current moment as a power adjustment value; Combined with the properties of the temperature control power at the current moment and the positive or negative condition of the change trend parameter, the temperature control power of the new energy battery pack at the current moment is adjusted using the power adjustment value to obtain the temperature control power of the new energy battery pack at the next moment.

8. The temperature detection and control method of a new energy battery pack according to claim 7, characterized in that: The step of combining the attribute of the temperature control power at the current moment and the positive or negative condition of the change trend parameter, and adjusting the temperature control power of the new energy battery pack at the current moment using the power adjustment value to obtain the temperature control power of the new energy battery pack at the next moment includes: The attributes of the temperature control power are heating power and heat dissipation power; When the attribute of the temperature control power is heating power, comparing the change trend parameter with 0; When the change trend parameter is greater than 0, the difference between the temperature control power of the new energy battery pack at the current moment and the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment; When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current moment is used as the temperature control power of the new energy battery pack at the next moment; When the change trend parameter is less than 0, the value obtained by adding the temperature control power of the new energy battery pack at the current moment to the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment.

9. The temperature detection and control method of a new energy battery pack according to claim 8, characterized in that: The obtaining of the temperature control power of the new energy battery pack at the next moment also includes: When the attribute of the temperature control power is heat dissipation power, comparing the change trend parameter with 0; When the change trend parameter is greater than 0, the value obtained by adding the temperature control power of the new energy battery pack at the current moment to the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment; When the change trend parameter is equal to 0, the temperature control power of the new energy battery pack at the current moment is used as the temperature control power of the new energy battery pack at the next moment; When the change trend parameter is less than 0, the difference between the temperature control power of the new energy battery pack at the current moment and the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment.

10. A temperature detection and control device for a new energy battery pack, characterized in that: It comprises a processor and a memory, wherein the processor is used to process instructions stored in the memory to implement a temperature detection and control method for a new energy battery pack as claimed in any one of claims 1 to 9.

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