A temperature detection control method and device for a new energy battery pack

Abstract

The present application relates to the technical field of battery, in particular to a temperature detection control method and device for new energy battery pack, comprising: obtaining the temperature control power of the new energy battery pack at the current time; determining the change trend parameter of the current sequence composed of the current data of each time according to the current data of each time; 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; 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 pack. The present application can overcome the influence of current thermal effect and uneven temperature distribution in the battery pack on temperature control to a certain extent by the adaptively determined temperature control power at the next time and opening degree index, which helps to improve the accuracy of temperature detection control of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and specifically to a method and device for temperature detection and control of a new energy battery pack. Background Technology

[0002] A new energy battery pack refers to the battery pack used in new energy vehicles. It typically consists of multiple battery cells that provide the vehicle with the necessary power. Its main function is to store and release electrical energy to drive the electric motor, thereby propelling the vehicle. When the battery pack operates at consistently high temperatures, it may affect the battery's lifespan and power efficiency, and could even lead to fires due to battery runaway. Therefore, temperature monitoring and control of new energy battery packs are particularly important.

[0003] Currently, temperature control of new energy battery packs typically relies on temperature detection devices installed inside the battery pack to monitor the internal temperature. When the detected battery temperature reaches the preset temperature range of the cooling system, heat dissipation is initiated; when it reaches the preset temperature range of the heating system, heating is initiated. However, during battery pack temperature control, the thermal effect of the current can influence the battery temperature to some extent. For example, during heat dissipation, the continuously increasing current in the battery pack can lead to insufficient heat dissipation and reduced overall cooling efficiency. Simultaneously, the location and materials of the parallel battery packs within the pack can result in uneven temperature distribution across different locations, further impacting battery temperature; for instance, it can lead to poor localized temperature control. Therefore, existing battery pack temperature detection and control methods suffer from low accuracy due to the thermal effect of the current and the poor uniformity of internal temperature distribution. Summary of the Invention

[0004] To address the aforementioned technical problem of low accuracy in temperature detection and control of existing new energy battery packs, the present invention aims to provide a method and apparatus for temperature detection and control of new energy battery packs. The specific technical solution adopted is as follows:

[0005] One embodiment of the present invention provides a temperature detection and control method and apparatus for a new energy battery pack, the method comprising the following steps:

[0006] The temperature control power of the new energy battery pack at the current moment is obtained, and the temperature control power is used to control the internal temperature of the new energy battery pack.

[0007] Acquire the current data of the new energy battery pack at each moment during the current period; based on the current data at each moment, determine the changing trend parameters of the current sequence composed of the current data at each moment;

[0008] Based on the temperature control power of the new energy battery pack at the current moment and the changing trend parameters, the temperature control power of the new energy battery pack at the next moment is determined, where the next moment refers to the moment after the current moment.

[0009] 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, determine the opening degree index of the heat source output branch pipe control valve of each heat sink.

[0010] By combining 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.

[0011] Furthermore, the step of determining the opening degree index of the heat source output branch pipe control valve for 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 includes:

[0012] Obtain the temperature data of the battery pack on both sides of each heat sink in the new energy battery pack at the current moment;

[0013] Based on the temperature data of the battery pack on both sides of each heat sink, determine the heat dissipation flow rate index of each heat sink at the next moment;

[0014] The opening degree index of the control valve of the heat source output branch pipe for each heat sink is determined based on the heat dissipation flow rate index.

[0015] Further, determining the heat dissipation flow rate index of each heat sink at the next moment based on the temperature data of the battery pack on both sides of each heat sink includes:

[0016] For any heat sink, calculate the absolute value of the average temperature of the battery pack on both sides of the heat sink;

[0017] The ratio of the absolute value to the comprehensive value of the battery temperature is used as the heat dissipation flow rate index of the heat sink at the next moment.

[0018] The overall battery temperature value is equal to the sum of the absolute values ​​of the average temperatures of the battery packs on both sides of the heat sink.

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

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

[0021] Based on the temperature data and battery temperature reference values ​​of each battery pack, the temperature control factor of the new energy battery pack at the current moment is determined.

[0022] The absolute value of the temperature control factor is multiplied by the preset power conversion hyperparameter, which is used as the temperature control power of the new energy battery pack at the current moment.

[0023] Further, determining the temperature control factor of the new energy battery pack at the current moment based on the temperature data of each battery pack and the battery temperature reference value includes:

[0024] The maximum and minimum temperature values ​​of the battery pack during normal operation are obtained, and the average value of the maximum and minimum temperature values ​​is used as the battery temperature reference value.

[0025] Calculate the ratio of the temperature data of each battery pack to the battery temperature reference value, and use the average of all ratios as the initial temperature control factor;

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

[0027] Further, determining the trend parameter of the current sequence composed of the current data at each time moment based on the current data at each time moment includes:

[0028] For all adjacent time intervals, the second difference is obtained by subtracting the current data of the previous time interval from the current data of the next time interval.

[0029] Calculate the average of all the second differences, and use the average of all the second differences as the trend parameter of the current sequence.

[0030] Further, determining the temperature control power of the new energy battery pack at the next moment based on the current temperature control power of the new energy battery pack and the changing trend parameters includes:

[0031] The absolute value of the trend parameter is determined, and the absolute value of the trend parameter is normalized to obtain a normalized value; the product of the normalized value and the temperature control power of the new energy battery pack at the current moment is used as the power adjustment value.

[0032] By combining the attributes of the temperature control power at the current moment and the positive or negative status of the 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.

[0033] Furthermore, the step of adjusting the temperature control power of the new energy battery pack at the current moment by combining the attributes of the temperature control power at the current moment and the positive or negative sign of the change trend parameter, and using the power adjustment value to obtain the temperature control power of the new energy battery pack at the next moment, includes:

[0034] The attributes of the temperature control power are heating power and heat dissipation power.

[0035] When the attribute of the temperature control power is heating power, compare the trend parameter with 0;

[0036] When the 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 taken as the temperature control power of the new energy battery pack at the next moment.

[0037] When the 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.

[0038] When the trend parameter is less than 0, the temperature control power of the new energy battery pack at the current moment is added to the power adjustment value, and the result is used as the temperature control power of the new energy battery pack at the next moment.

[0039] Furthermore, obtaining the temperature control power of the new energy battery pack at the next moment also includes:

[0040] When the attribute of the temperature control power is heat dissipation power, compare the changing trend parameter with 0;

[0041] When the trend parameter is greater than 0, the temperature control power of the new energy battery pack at the current moment is added to the power adjustment value, and the result is used as the temperature control power of the new energy battery pack at the next moment.

[0042] When the 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.

[0043] When the 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.

[0044] A temperature detection and control device for a new energy battery pack includes a processor and a memory. 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.

[0045] The present invention has the following beneficial effects:

[0046] This invention provides a temperature detection and control method and device for a new energy battery pack. First, the temperature control power of the new energy battery pack at the current moment is acquired. Then, the changing trend parameters of the current sequence during the current period are determined. Combining the changing trend parameters and the temperature control power of the new energy battery pack at the current moment, the temperature control power of the new energy battery pack at the next moment is determined. This improves the accuracy of battery temperature control while also increasing the energy efficiency ratio of the temperature detection and control device. 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, the heat source output branch pipe control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution inside the battery pack and improves the accuracy of temperature detection and control. Attached Figure Description

[0047] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a flowchart illustrating the implementation of a temperature detection and control method for a new energy battery pack according to the present invention.

[0049] Figure 2 This is a flowchart illustrating the implementation of step S2 in an embodiment of the present invention;

[0050] Figure 3 This is a flowchart illustrating the implementation of step S3 in an embodiment of the present invention;

[0051] Figure 4 This is a flowchart illustrating the implementation of step S4 in an embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the structure of a temperature detection and control device for a new energy battery pack according to the present invention;

[0053] The annotations in the attached figures are explained as follows:

[0054] 1 is the main body for battery temperature analysis and control; 2 is the heat source output pipe; 3 is the heat source return pipe; 4 is the first return branch pipe; 5 is the second return branch pipe; 6 is the third return branch pipe; 7 is the control valve for the first heat source output branch pipe; 8 is the control valve for the second heat source output branch pipe; 9 is the control valve for the third heat source output branch pipe; 10 is the first heat source output branch pipe; 11 is the second heat source output branch pipe; 12 is the third heat source output branch pipe; 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; and 20 is the temperature detection probe. Detailed Implementation

[0055] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the technical solution proposed according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, 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 invention pertains.

[0057] Example 1 of a temperature detection and control method for a new energy battery pack:

[0058] This embodiment provides a temperature detection and control method for a new energy battery pack, such as... Figure 1 As shown, it includes the following steps:

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

[0060] In this embodiment, the temperature control power is used to control the temperature inside the new energy battery pack. 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. Typically, the temperature control power is determined by the real-time temperature of each battery group within the battery pack. Therefore, when determining the temperature control power at the current moment, it can be determined using the temperature data of each battery group at the current moment. The specific implementation steps are achieved through the following steps S11 to S13 (not shown in the figure):

[0061] S11: Obtain the temperature data of each battery pack in the new energy battery pack at the current moment.

[0062] Specifically, temperature detection probes are installed in each battery pack within the new energy battery pack to monitor the surface temperature of each battery pack in real time, thereby obtaining the temperature data of each battery pack in the current new energy battery pack. Each battery pack has its own corresponding temperature data.

[0063] S12, based on the temperature data of each battery pack and the battery temperature reference value, determines the temperature control factor of the new energy battery pack at the current moment.

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

[0065] When the temperature data is much higher than the battery temperature reference value, it indicates that the internal temperature of the battery pack is too high. It is necessary to determine the temperature control power to dissipate heat from the battery pack in order to avoid serious accidents caused by excessively high battery pack temperature. Temperature control is therefore quite necessary. When the temperature data is much lower than the battery temperature reference value, it indicates that the internal temperature of the battery pack is too low, which is not conducive to the charging and discharging operation of the battery pack. It is necessary to determine the temperature control power to heat the battery pack in order to dissipate heat from the battery pack. Temperature control is also quite necessary.

[0066] Step S12 above can be achieved through the following steps S121 to S123 (not shown in the figure):

[0067] S121, obtain the maximum and minimum temperature values ​​when the battery pack is working normally, and use the average of the maximum and minimum temperature values ​​as the battery temperature reference value.

[0068] Specifically, first, the normal operating temperature range [T1, T2] of the new energy battery pack is set, where T1 represents the minimum normal operating temperature of the battery pack, which is empirically set to 0 degrees Celsius; T2 represents the maximum normal operating temperature of the battery pack, which is empirically set to 25 degrees Celsius. The specific normal operating temperature range can be set according to actual needs and is not specifically limited. Next, the midpoint of the temperature range is selected as a reference value, i.e., the battery temperature reference value, which is equal to the average of the maximum and minimum temperature values.

[0069] Of course, implementers can also determine the battery temperature reference value in other ways, and there is no limitation on how the battery temperature reference value is determined. For example, the battery temperature reference value can be set manually based on historical experience values.

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

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

[0072] As an example, the formula for calculating the temperature control factor of the new energy battery pack at time s can be:

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

[0074] In the formula for calculating the temperature control factor, This represents the ratio of the temperature data of the r-th battery pack at time s 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, the greater the difference between the overall temperature of the new energy battery pack at time s and the battery temperature reference value. The first difference after subtracting 1 is equivalent to the range of the battery pack temperature exceeding the normal temperature. The range value may be positive or negative. When it is positive, the heat dissipation power required by the battery pack is greater. When it is negative, the heating power required by the battery pack is greater.

[0075] Therefore, when the temperature control factor K s When the temperature control factor K is greater than or equal to 1, heat dissipation treatment is required for the battery pack; when the temperature control factor K... s When the temperature control factor K is less than -1, the battery pack needs to be heated; when the temperature control factor K is less than -1, the battery pack needs to be heated. s When the battery is located in the (-1,1) range, no temperature control is performed on the battery pack inside the battery pack.

[0076] S13, the absolute value of the temperature control factor is multiplied by the preset power conversion hyperparameter, and the product is used 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 factor obtained in step S12 can be used to obtain the temperature control power of the new energy battery pack at the current moment. The temperature control factor can characterize the power control status of the heating or heat dissipation equipment.

[0078] As an example, the formula for calculating the temperature control power of the new energy battery pack at time s can be:

[0079] P s =k×|K s |;In the formula, P s K represents the temperature control power of the new energy battery pack at time s, k represents the preset power conversion hyperparameter, specifically referring to the hyperparameter for heating or cooling power conversion. The hyperparameter can be taken as an empirical value of 3, and || represents the absolute value function. s This indicates the temperature control factor.

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

[0081] It should be noted that the temperature control power determined by the battery pack temperature can provide real-time feedback. It can adjust the power level in real time according to the current changes in the battery pack temperature. For example, if the battery pack temperature drops at the current moment, it may stop heat dissipation, which can effectively save energy.

[0082] Thus, this embodiment obtains the temperature control power of the new energy battery pack at the current moment.

[0083] S2, acquire the current data of the new energy battery pack at each moment during the current period; based on the current data at each moment, determine the changing trend parameters of the current sequence composed of the current data at each moment.

[0084] In this embodiment, the thermal effect of current will influence the battery temperature to some extent during battery temperature control. For example, when heating or cooling the battery pack, the cooling power needs to be increased to avoid insufficient heat dissipation. Analyzing the thermal effect of current requires determining the trend parameter of the current sequence. This trend parameter is used to analyze the trend of the battery pack's current data at the current moment. When the trend parameter is greater than 0, it indicates that the battery pack current is rising; when the trend parameter is equal to 0, it indicates that the battery pack current is stable; and when the trend parameter is less than 0, it indicates that the battery pack current is falling. This trend parameter can be used to determine the temperature control power of the new energy battery pack at the next moment.

[0085] The above step S2 can be achieved through Figure 2 The steps shown are to be implemented as follows:

[0086] S21, acquire the current data of the new energy battery pack at each moment during the current period.

[0087] In this embodiment, the current time period refers to the time period consisting of the current moment and several moments preceding the current moment. The number of moments within the current time period can be set to 10, and the implementer can set the current time period according to the specific actual situation. Current data is collected at each moment during the operation of the new energy battery pack in the current time period. This current data represents the operating current of the new energy battery pack, and the current data at each moment serves as the benchmark data for subsequent analysis of trend parameters.

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

[0089] S23, calculate the average of all second differences, and use the average of all second differences as the trend parameter of the current sequence.

[0090] As an example, the formula for calculating the changing trend parameter of the battery sequence can be:

[0091] In the formula, X n′ The parameter represents the trend of the current sequence during the current period, g represents the number of current data points in the current sequence, i represents the sequence number of the current data points, and F represents the current sequence number. n′(i+1) F represents the current data at time i+1 in the current sequence of the current period. n′i This represents the current data at the i-th moment in the current sequence of the current time period, and n′ represents the current time period including the current moment.

[0092] In the formula for calculating the trend parameter, the current data from the next moment in the current sequence are paired. If the difference between each pair of current data is negative, meaning the trend parameter is less than zero, it indicates that the current data in the consecutive moments of the battery sequence generally shows a downward trend; the absolute value of the trend parameter represents the magnitude of this decrease. Conversely, if the difference between each pair of current data is positive, it means the current data at a later moment in the current sequence may be greater than the current at a previous moment; this indicates that the current data in the consecutive moments of the battery sequence generally shows an upward trend, and the trend parameter represents the magnitude of this increase. Here, "next moment" and "previous moment" refer to two adjacent moments.

[0093] Thus, this embodiment has obtained the trend parameters of the current sequence during the current period.

[0094] S3, based on the temperature control power and trend parameters of the new energy battery pack at the current moment, determine the temperature control power of the new energy battery pack at the next moment.

[0095] In this embodiment, the operating current of the battery pack affects the control of the battery pack surface temperature when the battery is heating or cooling. For example, when the battery is cooling or heating, the battery operating current continuously increases, and the heat generated inside the battery pack also continuously increases, and vice versa. Therefore, when cooling the battery pack, the battery operating current continuously increases, so the cooling power can be appropriately increased to avoid poor heat dissipation due to the current heating effect, that is, to avoid potential hazards due to insufficient battery cooling; when heating the battery pack, the battery operating current continuously increases, so the heating power can be appropriately reduced, and the current heating effect can be used to increase the battery surface temperature. Here, "next moment" refers to the moment after the current moment.

[0096] The above step S3 can be achieved through Figure 3 The steps shown are to be implemented as follows:

[0097] S31, determine the absolute value of the trend parameter, normalize the absolute value of the trend parameter to obtain the normalized value; multiply the normalized value by the temperature control power of the new energy battery pack at the current moment as the power adjustment value.

[0098] In this embodiment, the trend parameter may be negative. Therefore, when adjusting the temperature control power using the trend parameter, the absolute value of the trend parameter needs to be obtained as the power adjustment range. After obtaining the power adjustment range, a linear normalization function is used to normalize the power adjustment range, and the product of the normalized value and the temperature control power of the new energy battery pack at the current moment is used as the power adjustment value.

[0099] S32, combining the attributes and trend parameters of the temperature control power at the current moment, adjusts 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.

[0100] In this embodiment, the attributes of temperature control power are heating power and heat dissipation power. The adjustment methods for temperature control power differ depending on the attribute of the temperature control power, so it is necessary to determine the temperature control power of the new energy battery pack in two different scenarios for the next moment.

[0101] Case 1: When the attribute of the temperature control power is heating power, compare the changing trend parameter with 0.

[0102] When the trend parameter is greater than 0, the difference between the temperature control power and the power adjustment value 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.

[0103] When the 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.

[0104] When the trend parameter is less than 0, the temperature control power of the new energy battery pack at the current moment is added to the power adjustment value, and the result is used as the temperature control power of the new energy battery pack at the next moment.

[0105] The expression for power regulation during heating can be:

[0106] In the formula, P n+1 P represents the heating power of the new energy battery pack at the next moment. n X represents the heating power of the new energy battery pack at the current moment, norm represents the linear normalization function, and X represents the heating power of the new energy battery pack at the current moment. n P represents the parameter indicating the trend of the current sequence during the current period. n ×norm(X n ) and P n ×norm(|X n |) are all power adjustment values ​​for heating power, || represents the absolute value function, n represents the current time, and n+1 represents the next time.

[0107] Scenario 2: When the attribute of temperature control power is heat dissipation power, compare the changing trend parameter with 0.

[0108] When the trend parameter is greater than 0, the temperature control power of the new energy battery pack at the current moment is added to the power adjustment value, and the result is used as the temperature control power of the new energy battery pack at the next moment.

[0109] When the 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 trend parameter is less than 0, the difference between the temperature control power and the power adjustment value 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.

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

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

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

[0114] S4. 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, determine the opening degree index of the heat source output branch pipe control valve of each heat sink.

[0115] In this embodiment, due to the influence of the position and material of the parallel battery packs within the battery pack, the temperature distribution uniformity of the battery packs at different locations may be low. For example, compared to the temperature dissipation of battery packs located at the edges of the battery pack, the temperature dissipation of battery packs located in the middle of the battery pack is relatively poor, and their battery temperatures are relatively higher. During use, the temperature of the battery packs has a significant impact on their performance and lifespan. To achieve better control over the temperature of the battery packs inside, it is necessary to determine the opening degree index of the heat source output branch pipe control valve based on the temperature data of the heat sinks at different locations. A larger opening degree index results in a larger flow rate of the heat transfer fluid within the heat sink, leading to better heat dissipation.

[0116] The above step S4 can be achieved through Figure 4 The steps shown are to be implemented as follows:

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

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

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

[0120] S42 determines the heat dissipation flow rate index of each heat sink at the next moment based on the temperature data of the battery pack on both sides of each heat sink.

[0121] In this embodiment, the temperature data of the battery pack is positively correlated with the heat dissipation flow rate. When the temperature data is higher, the flow rate of the heat transfer fluid in the heat sink should be higher in order to avoid the danger caused by excessive temperature. When the temperature data is lower, the flow rate of the heat transfer fluid in the heat sink should be lower in order to avoid unnecessary waste of resources.

[0122] The above step S42 can be achieved through steps S421 to S422:

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

[0124] In this embodiment, the temperature data of the battery pack may be negative, so it is necessary to take the absolute value of the average temperature of the battery packs on both sides.

[0125] S422 uses the ratio of the absolute value to the overall battery temperature as the heat dissipation flow rate of the heat sink at the next moment.

[0126] As an example, the formula for calculating the heat dissipation flow rate of the heat sink at the next moment can be:

[0127] q (n+1)u This indicates the heat dissipation flow rate of the heat sink at the next moment. Let || represent the average temperature of the battery pack on both sides of the u-th heat sink at the current moment, || denotes the absolute value function, and z represents the number of heat sinks. This represents the overall battery temperature value, which is equal to the sum of the absolute values ​​of the average temperatures of the battery pack on both sides of all heat sinks. In this embodiment, the overall battery temperature value is not considered to be zero.

[0128] In the formula for calculating the heat dissipation flow rate index, a larger index indicates a greater flow rate of heat transfer fluid to the corresponding heat sink, resulting in better battery cooling efficiency. The heat dissipation flow rate index can be used to control the opening of the control valve on the heat source output branch pipe corresponding to the heat sink. A larger index requires a larger opening of the control valve on the heat source output branch pipe to ensure sufficient heat dissipation, thus providing enough heat transfer fluid to the heat sink for cooling the battery pack. Each heat sink has its own corresponding heat dissipation flow rate index at any given time.

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

[0130] Specifically, the heat dissipation flow rate index is mapped to a value between 0 and 1 to obtain the mapped value. The mapped value is used as the opening degree index, and it is defined that a fully open heat source output branch pipe control valve is 1, and a half-open valve is 0.5. After obtaining the heat dissipation flow rate index, the control system controls the corresponding heat source output branch pipe control valve of the heat sink to open to a certain extent according to the opening degree index, and then circulates the heat transfer fluid to achieve heat dissipation of the battery pack.

[0131] Of course, the valve opening degree can also be adjusted using a PID (Proportional-Integral-Derivative) control algorithm. Specifically, based on the heat dissipation flow rate, an appropriate control signal can be calculated to adjust the valve opening and achieve precise control. The implementation process of the PID control algorithm is existing technology and is not within the scope of this invention; therefore, it will not be described in detail here.

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

[0133] S5 combines temperature control power and opening degree indicators to perform temperature detection and control of the new energy battery pack at the next moment.

[0134] In this embodiment, after obtaining the temperature control power and opening degree indicators for the next moment, relevant instructions are executed according to the temperature control power and opening degree indicators of the new energy battery pack at the next moment to complete the temperature detection and control. The interval between two adjacent moments can be set by the implementer according to specific circumstances, for example, set to 30 seconds.

[0135] After completing the temperature detection and control for the next moment, temperature and current data on the surface of the battery pack can continue to be collected. Following the temperature detection and control method for a new energy battery pack described above, the temperature control power and opening degree index of the new energy battery pack for the next moment can be determined to achieve real-time and accurate temperature detection and control of the new energy battery pack.

[0136] Thus, this embodiment completes the temperature detection and control of the new energy battery pack.

[0137] Example 2 of a temperature detection and control device for a new energy battery pack:

[0138] This invention provides a temperature detection and control device for a new energy battery pack, which may include three modules: a data acquisition module, a heating and heat dissipation module, and an analysis and control module. The data acquisition module is signal-connected to the analysis and control module, and the analysis and control module is signal-connected to the heating and heat dissipation module. The data acquisition module includes a current detection submodule and a temperature detection submodule.

[0139] A schematic diagram of a temperature detection and control device for a new energy battery pack is shown below. Figure 5 As shown, the temperature control process of the new energy battery pack in the temperature detection and control device is as follows:

[0140] First, the current detection submodule built into the battery temperature analysis and control main body 1 and the temperature detection probes deployed in the middle of each parallel battery pack are used to collect the current and temperature data of the battery pack during operation.

[0141] Secondly, the collected data is analyzed and calculated using the analysis and control module in the battery temperature analysis and control unit 1. Based on the analysis results, the circulating heat transfer fluid is controlled to be heated or cooled by the heating and heat dissipation module integrated in the battery temperature analysis and control unit 1.

[0142] Then, the heat transfer fluid is transmitted through the heat source output pipe 2, and then through the first heat source output branch pipe 10, the second heat source output branch pipe 11 and the third heat source output branch pipe 12 to the corresponding first heat sink 17, second heat sink 18 and third heat sink 19. The heat sink transfers the temperature of the liquid in the pipe to the surrounding battery pack, thereby changing the temperature of the battery pack.

[0143] Next, the heat-conducting liquid circulates through the first heat sink 17, the second heat sink 18 and the third heat sink 19, and then flows into the heat source return pipe 3 through the first return branch pipe 4, the second return branch pipe 5 and the third return branch pipe 6 connected to the outlet.

[0144] Finally, the temperature control steps described above are repeated to circulate the heat transfer fluid, thereby controlling the battery temperature.

[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 to the analysis and control module of the battery temperature analysis and control main body 1. By controlling the opening degree of different valves, the battery packs at different locations are heated or cooled, which can solve the problem of uneven temperature distribution, thereby achieving precise 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] Among them, the power of the integrated battery temperature heating and heat dissipation module in the battery temperature analysis and control main body 1, as well as 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 and control device for a new energy battery pack provided in this embodiment is essentially a processor device, implemented by an internal temperature detection and control method. Since the implementation process of the temperature detection and control method has been described in detail in the above embodiment one of the temperature detection and control methods for a new energy battery pack, it will not be repeated here.

[0148] This invention provides a temperature detection and control method and device for a new energy battery pack. First, the temperature control power of the new energy battery pack at the current moment is acquired. Then, the changing trend parameters of the current sequence during the current period are determined. Combining the changing trend parameters and the temperature control power of the new energy battery pack at the current moment, the temperature control power of the new energy battery pack at the next moment is determined. This improves the accuracy of battery temperature control while also increasing the energy efficiency ratio of the temperature detection and control device. 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, the heat source output branch pipe control valve is controlled, which to some extent overcomes the defect of uneven temperature distribution inside the battery pack and improves the accuracy of temperature detection and control.

[0149] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A temperature detection control method of a new energy battery pack, characterized in that, Includes the following steps: The temperature control power of the new energy battery pack is obtained at the current moment. 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 its operation in the current period; Based on the current data at each moment, determine the trend parameters of the current sequence composed of the current data at each moment; Based on the temperature control power and trend parameters of the new energy battery pack at the current moment, determine the temperature control power of the new energy battery pack at the next moment. The next moment refers to the moment after the current moment. 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, determine the opening degree index of the heat source output branch pipe control valve of each heat sink. By combining temperature control power and opening degree indicators, the temperature of the new energy battery pack is detected and controlled at the next moment; 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, determine the opening degree index of the heat source output branch pipe control valve of each heat sink, including: obtaining 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 the heat dissipation flow rate index of each heat sink at the next moment based on the temperature data of the battery pack on both sides of each heat sink; and determining the opening degree index of the heat source output branch pipe control valve of each heat sink based on the heat dissipation flow rate index. Based on the temperature data of the battery packs on both sides of each heat sink, determine the heat dissipation flow rate index of each heat sink at the next moment, including: for any heat sink, calculate the absolute value of the average temperature of the battery packs on both sides of the heat sink; use the ratio of the absolute value to the comprehensive battery temperature value as the heat dissipation flow rate index of the heat sink at the next moment; wherein, the comprehensive battery temperature value is equal to the sum of the absolute values ​​of the average temperature of the battery packs on both sides of all heat sinks. Based on the current temperature control power and trend parameters of the new energy battery pack, determine the temperature control power of the new energy battery pack at the next moment, including: determining the absolute value of the trend parameters, normalizing the absolute value of the trend parameters to obtain a normalized value; multiplying the normalized value by the current temperature control power of the new energy battery pack as the power adjustment value; and adjusting the temperature control power of the new energy battery pack at the next moment using the power adjustment value, taking into account the attributes of the current temperature control power and the positive or negative status of the trend parameters, to obtain the temperature control power of the new energy battery pack at the next moment, including the attributes of the temperature control power being heating power and heat dissipation power. When the temperature control power attribute is heating power, the trend parameter is compared with 0; when the trend parameter is greater than 0, the difference between the current temperature control power of the new energy battery pack and the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment; when the trend parameter is equal to 0, the current temperature control power of the new energy battery pack is used as the temperature control power of the new energy battery pack at the next moment; when the trend parameter is less than 0, the sum of the current temperature control power of the new energy battery pack and the power adjustment value is used as the temperature control power of the new energy battery pack at the next moment. Obtaining 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 changing trend parameter with 0; when the changing trend parameter is greater than 0, adding the current temperature control power of the new energy battery pack to the power adjustment value, and using this value as the temperature control power of the new energy battery pack at the next moment; when the changing trend parameter is equal to 0, using the current temperature control power of the new energy battery pack as the temperature control power of the new energy battery pack at the next moment; when the changing trend parameter is less than 0, using the difference between the current temperature control power of the new energy battery pack and the power adjustment value as the temperature control power of the new energy battery pack at the next moment.

2. The temperature detection and control method for a new energy battery pack according to claim 1, characterized in that, Obtain the temperature control power of the new energy battery pack at the current moment, including: Obtain the temperature data of each battery pack in the new energy battery pack at the current moment; Based on the temperature data and battery temperature reference values ​​of each battery pack, determine the temperature control factor of the new energy battery pack at the current moment; The absolute value of the temperature control factor is multiplied by the preset power conversion hyperparameter, which is used as the temperature control power of the new energy battery pack at the current moment.

3. The temperature detection and control method for a new energy battery pack according to claim 2, characterized in that, Based on the temperature data and battery temperature reference values ​​for each battery pack, the temperature control factor for the new energy battery pack at the current moment is determined, including: Obtain the maximum and minimum temperature values ​​when the battery pack is operating normally, and use the average of the maximum and minimum temperature values ​​as the battery temperature reference value; Calculate the ratio of the temperature data of each battery pack to the battery temperature reference value, and use the average of all ratios as the initial temperature control factor; The initial temperature control factor is subtracted by 1 to obtain the first difference, which is then used as the temperature control factor of the new energy battery pack at the current moment.

4. The temperature detection and control method for a new energy battery pack according to claim 1, characterized in that, Based on the current data at each time point, determine the trend parameters of the current sequence composed of the current data at each time point, including: For all adjacent time intervals, the second difference is obtained by subtracting the current data of the previous time interval from the current data of the next time interval. Calculate the average of all second differences and use the average of all second differences as the trend parameter of the current sequence.

5. A temperature detection and control device for a new energy battery pack, characterized in that, It includes 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 described in any one of claims 1-4.

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