Current control method and device for electrical parts in battery pack and controller

Abstract

The invention discloses a current control method for an electrical part in a battery pack, and the method comprises the steps: a controller determines a real-time heat accumulation value of the electrical part under the condition that the real-time current of the electrical part reaches a preset current, and the real-time heat accumulation value is a heat accumulation value from a reference moment to a determination moment of the real-time heat accumulation value; the reference moment is the moment when the real-time current reaches the preset current. And if the real-time heat accumulation value reaches the first preset heat accumulation value, the current of the electrical part can be reduced, so that the real-time heat accumulation value is smaller than the first preset heat accumulation value. Therefore, the problem that the electrical part works at a high temperature for a long time can be effectively avoided, the problems of insulation failure and high-voltage safety failure of the electrical part caused by melting of a plastic shell of the electrical part are further avoided, and the service life of the electrical part is prolonged.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and specifically to a current control method and device, and a controller for electrical components in a battery pack. Background Art

[0002] With the development of new energy vehicles, the battery pack, as the power source of the vehicle, its performance and safety directly determines the safety of the vehicle.

[0003] In the related art, a battery pack may include multiple electrical components. Since temperature monitoring devices are usually not provided in the target electrical components among the multiple electrical components (such as relays and fuses), when the temperature of the target electrical components continues to be high, the continued high temperature may cause the plastic casing of the target electrical components to melt, thereby causing insulation failure and high-voltage safety failure of the target electrical components. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one purpose of the present invention is to propose a current control method for an electrical component in a battery pack, which can effectively avoid the problem of the electrical component working at high temperature for a long time, and the problem of insulation failure and high voltage safety failure of the electrical component caused by high temperature, thereby extending the service life of the electrical component.

[0005] According to an embodiment of the present invention, a current control method for an electrical component in a battery pack includes:

[0006] When the real-time current of the electrical component reaches the preset current, determining the real-time heat accumulation value of the electrical component, the real-time heat accumulation value is the heat accumulation value between the reference time and the time when the real-time heat accumulation value is determined, and the reference time is the time when the real-time current reaches the preset current;

[0007] If the real-time heat accumulation value reaches the first preset heat accumulation value, the current of the electrical component is reduced so that the real-time heat accumulation value is lower than the first preset heat accumulation value.

[0008] In some embodiments of the present invention, after reducing the current of the electrical component, the method further includes:

[0009] If the real-time heat accumulation value reaches a second preset heat accumulation value, the current of the electrical component is stopped from being reduced, and the second preset heat accumulation value is less than the first preset heat accumulation value.

[0010] In some embodiments of the present invention, the method further comprises:

[0011] Obtain the thermal capacity of electrical components and the preset temperature reduction amount;

[0012] determining a heat reduction value based on a product of the heat capacity and a preset temperature reduction amount;

[0013] The difference between the first preset heat accumulation value and the heat reduction value is determined as the second preset heat accumulation value.

[0014] In some embodiments of the present invention, obtaining the heat capacity of an electrical component includes:

[0015] Determining the heat capacity of the electrical component based on a first ratio of a first preset heat accumulation value to a preset temperature rise amount;

[0016] The preset temperature rise amount is the change amount of the temperature of the electrical component from the reference temperature to the thermal equilibrium temperature of the electrical component.

[0017] In some embodiments of the present invention, the method further comprises:

[0018] Obtaining a preset heat dissipation power and heat generated by multiple samples, wherein the heat generated by the multiple samples corresponds to the temperature rise equilibrium time of the multiple samples one by one;

[0019] For each sample temperature rise equilibrium time, determine the product of the sample temperature rise equilibrium time and the preset heat dissipation power to obtain the first sample heat dissipation heat;

[0020] Determine the heat generated by each sample and the difference between the heat generated by the sample and the heat dissipated by the first sample corresponding to the heat generated by the sample, and obtain the heat absorbed by the sample;

[0021] A first preset heat accumulation value is determined based on the heat amounts absorbed by the plurality of samples.

[0022] In some embodiments of the present invention, determining a first preset heat accumulation value based on heat absorbed by a plurality of samples includes:

[0023] Determining a plurality of target sample endothermic heats from a plurality of sample endothermic heats, wherein a minimum value of the plurality of target sample endothermic heats is greater than a minimum value of the plurality of sample endothermic heats;

[0024] A first preset heat accumulation value is determined based on an average value of heat absorbed by a plurality of target samples.

[0025] In some embodiments of the present invention, obtaining a preset heat dissipation power includes:

[0026] For each sample heat generation amount, determine a second sample heat dissipation amount based on the difference between the sample heat generation amount and the target heat absorption amount, and determine the sample heat dissipation power based on a second ratio of the second sample heat dissipation amount to the sample temperature rise equilibrium time corresponding to the sample heat generation amount;

[0027] The preset heat dissipation power is determined based on the multiple sample heat dissipation powers, and the minimum value of the multiple target sample heat dissipation powers is greater than the minimum value of the multiple sample heat dissipation powers.

[0028] In some embodiments of the present invention, determining a preset heat dissipation power based on a plurality of sample heat dissipation powers includes:

[0029] determining a plurality of target sample heat dissipation powers from a plurality of sample heat dissipation powers;

[0030] The preset heat dissipation power is determined based on an average value of the heat dissipation powers of a plurality of target samples.

[0031] In some embodiments of the present invention, after obtaining the heat generated by a plurality of samples, the method further comprises:

[0032] Determine the minimum value of the temperature rise equilibrium time of multiple samples;

[0033] The sample heat generation heat corresponding to the minimum value is determined as the target heat absorption heat.

[0034] In some embodiments of the present invention, obtaining heat generated by a plurality of samples includes:

[0035] Obtain multiple sample currents and multiple sample temperature rise balance times, where each sample temperature rise balance time is the time taken for the electrical component to reach temperature rise balance under the corresponding sample current;

[0036] For each sample current, a sample heat amount generated by the electrical component under the sample current is determined based on the sample current, the resistance value of the electrical component, and a sample temperature rise equilibrium time corresponding to the sample current.

[0037] In some embodiments of the present invention, the method further comprises:

[0038] Determining a third ratio of a preset heat dissipation power to a resistance value of the electrical component;

[0039] Based on the square root of the third ratio, a preset current is determined.

[0040] In some embodiments of the present invention, determining the real-time heat accumulation value of the electrical component includes:

[0041] Obtaining the real-time heat absorption of the electrical component at each of the multiple moments, the reference moment being the earliest moment among the multiple moments, and the determined moment being the latest moment among the multiple moments;

[0042] The sum of the real-time heat absorption heat at multiple moments is determined as the real-time heat accumulation value of the electrical component.

[0043] In some embodiments of the present invention, obtaining the real-time heat absorption amount of the electrical component at each of multiple moments includes:

[0044] For each moment, obtain the real-time current of the electrical components at that moment;

[0045] Based on the time difference, the resistance of the electrical component and the real-time current of the electrical component at time , determine the real-time heat generated by the electrical component at time , the starting time of the time difference is the time before and adjacent to time among the multiple time points, and the ending time of the time difference is time ;

[0046] Determine the real-time heat dissipation heat based on the product of the preset heat dissipation power and the time difference;

[0047] The difference between the real-time heat generation and the real-time heat dissipation is determined as the real-time heat absorption of the electrical component at the moment.

[0048] According to a computer-readable storage medium of an embodiment of the present invention, a computer program is stored thereon, and when the computer program is executed by a processor, the current control method of an electrical component in a battery pack is implemented.

[0049] A controller according to an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the current control method of the electrical components in the battery pack is implemented.

[0050] According to an embodiment of the present invention, a current control device for an electrical component in a battery pack includes:

[0051] A determination module, for determining a real-time heat accumulation value of the electrical component when the real-time current of the electrical component reaches a preset current, the real-time heat accumulation value being a heat accumulation value between a reference time and a determination time of the real-time heat accumulation value, the reference time being a time when the real-time current reaches the preset current;

[0052] The adjustment module is used to reduce the current of the electrical component if the real-time heat accumulation value reaches the first preset heat accumulation value, so that the real-time heat accumulation value is lower than the first preset heat accumulation value.

[0053] In summary, the embodiments of the present invention provide a current control method and device and a controller for an electrical component in a battery pack. In the method, when the real-time current of the electrical component reaches a preset current, the controller can determine that the temperature of the electrical component is high, and thus determine the real-time heat accumulation value of the electrical component. The real-time heat accumulation value is the heat accumulation value between the reference time and the determination time of the real-time heat accumulation value, and the reference time is the time when the real-time current reaches the preset current. If the real-time heat accumulation value reaches the first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, and thus the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of the electrical component working at a high temperature for a long time, and further avoid the problem of the plastic shell of the electrical component melting, resulting in insulation failure of the electrical component and high-voltage safety failure, thereby extending the service life of the electrical component.

[0054] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a flow chart of a current control method of an electrical component in a battery pack provided by an embodiment of the present invention;

[0056] Figure 2 is a flow chart of another current control method of an electrical component in a battery pack provided by an embodiment of the present invention;

[0057] Figure 3 is a flow chart of another current control method of an electrical component in a battery pack provided by an embodiment of the present invention;

[0058] Figure 4 A curve diagram showing the relationship between a sample current and a sample temperature rise equilibrium time of a relay provided in an embodiment of the present invention;

[0059] Figure 5 A sample current of a relay provided by an embodiment of the present invention and a data table corresponding to the sample current;

[0060] Figure 6 A graph showing the relationship between the real-time heat accumulation value and time of a relay provided in an embodiment of the present invention;

[0061] Figure 7 A curve diagram showing the relationship between real-time current and time of a relay provided in an embodiment of the present invention;

[0062] Figure 8 A curve diagram showing the relationship between the real-time temperature and time of a relay provided by an embodiment of the present invention;

[0063] Fig. 9 A schematic diagram of the structure of a controller provided by an embodiment of the present invention;

[0064] Fig.10 is a block diagram of a current control device for an electrical component in a battery pack provided by an embodiment of the present invention;

[0065] Fig.11 It is a block diagram of another current control device for electrical components in a battery pack provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0066] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0067] With the development of new energy vehicles, the battery pack, as the power source of the vehicle, its performance and safety directly determines the safety of the vehicle.

[0068] In the related art, a battery pack may include multiple electrical components. Since temperature monitoring devices are usually not provided in the target electrical components among the multiple electrical components (such as relays and fuses in a distribution box), when the temperature of the target electrical components continues to be high, the continued high temperature may cause the plastic casing of the target electrical components to melt, thereby causing insulation failure and high-voltage safety failure of the target electrical components.

[0069] In addition, the continuous high temperature will cause the fuse in the battery pack to disconnect, thereby cutting off the circuit in the battery pack to ensure high voltage safety. However, this method will require the subsequent replacement of the distribution box.

[0070] In the related art, in another implementation, a temperature monitoring device can be added to the target electrical component, and the temperature monitoring device is used to collect the temperature of the target electrical component. The controller can monitor the temperature collected by the temperature monitoring device, and when the temperature is high, reduce the temperature of the target electrical component. However, since this method requires adding a temperature monitoring device to the target electrical component, the hardware cost is high.

[0071] The embodiment of the present invention provides a current control method and device and a controller for an electrical component in a battery pack. In the method, when the real-time current of the electrical component reaches a preset current, the controller can determine that the temperature of the electrical component is high, and thus determine the real-time heat accumulation value of the electrical component. The real-time heat accumulation value is the heat accumulation value between a reference time and a determination time of the real-time heat accumulation value, and the reference time is the time when the real-time current reaches the preset current. If the real-time heat accumulation value reaches a first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, and thus the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of the electrical component working at a high temperature for a long time, and further avoid the problem of the plastic shell of the electrical component being melted, resulting in insulation failure and high-voltage safety failure of the electrical component, thereby extending the service life of the electrical component.

[0072] Furthermore, if the electrical component is a fuse, by using the method provided by the embodiment of the present invention, the problem of fuse disconnection caused by continuous high temperature can be avoided, thereby avoiding the subsequent replacement of the distribution box and reducing costs.

[0073] Since the controller determines the real-time heat accumulation value of the electrical component and determines whether to reduce the current of the electrical component based on whether the real-time heat accumulation value reaches a first preset heat accumulation value, there is no need to add a temperature monitoring device in the electrical component, and there is no need to judge whether to reduce the current of the electrical component based on the temperature collected by the temperature monitoring device, thereby effectively reducing the cost of temperature monitoring of the electrical component.

[0074] Figure 1 FIG. 1 is a flow chart of a current control method for an electrical component in a battery pack provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0075] Step 101: When the real-time current of the electrical component reaches a preset current, determine the real-time heat accumulation value of the electrical component.

[0076] The controller can obtain the real-time current of the electrical component. When the real-time current of the electrical component reaches a preset current, it can be determined that the temperature of the electrical component is high, and thus the real-time heat accumulation value of the electrical component can be determined.

[0077] The real-time heat accumulation value is the heat accumulation value between the reference time and the determination time of the real-time heat accumulation value, the reference time is the time when the real-time current reaches the preset current, and the determination time can be any time after the reference time.

[0078] Step 102: If the real-time heat accumulation value reaches a first preset heat accumulation value, the current of the electrical component is reduced.

[0079] When the real-time current of the electrical component reaches the preset current, the controller determines the real-time heat accumulation value of the electrical component. If the real-time heat accumulation value reaches the first preset heat accumulation value, it can be determined that the electrical component has been working at high temperature for a long time. Therefore, the current of the electrical component can be reduced to make the real-time heat accumulation value less than the first preset heat accumulation value.

[0080] In summary, an embodiment of the present invention provides a current control method for an electrical component in a battery pack, in which the controller can determine that the temperature of the electrical component is high when the real-time current of the electrical component reaches a preset current, and thus determine the real-time heat accumulation value of the electrical component, the real-time heat accumulation value being the heat accumulation value between a reference moment and a determination moment of the real-time heat accumulation value, the reference moment being the moment when the real-time current reaches the preset current. If the real-time heat accumulation value reaches a first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, and thus the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of the electrical component working at a high temperature for a long time, and further avoid the problem of the plastic shell of the electrical component being melted, resulting in insulation failure and high-voltage safety failure of the electrical component, thereby extending the service life of the electrical component.

[0081] Furthermore, since the controller determines the real-time heat accumulation value of the electrical component and determines whether to reduce the current of the electrical component based on whether the real-time heat accumulation value reaches a first preset heat accumulation value, there is no need to add a temperature monitoring device to the electrical component, and there is no need to determine whether to reduce the current of the electrical component based on the temperature collected by the temperature monitoring device, thereby effectively reducing the cost of temperature monitoring of the electrical component.

[0082] Figure 2 FIG. 1 is a flow chart of another current control method for an electrical component in a battery pack provided by an embodiment of the present invention. Figure 2 As shown, the method may include:

[0083] Step 201: Obtain a preset heat dissipation power, a first preset heat accumulation value, a second preset heat accumulation value, and a preset current of an electrical component.

[0084] The controller can obtain a preset heat dissipation power, a first preset heat accumulation value, a second preset heat accumulation value and a preset current of the electrical component.

[0085] refer to Figure 3 The process in which the controller obtains the preset heat dissipation power, the first preset heat accumulation value and the second preset heat accumulation value of the electrical component may include the following steps A1 to A7.

[0086] Step A1: Obtain heat generated by multiple samples.

[0087] The controller can obtain heat generated by multiple samples, wherein the heat generated by the multiple samples corresponds to the temperature rise equilibrium time of the multiple samples one by one.

[0088] Optionally, the controller may obtain multiple sample currents and multiple sample temperature rise balance times, and the multiple sample currents correspond to the multiple sample temperature rise balance times. For each sample current, the controller may determine the sample heat generated by the electrical component under the sample current based on the sample current, the resistance of the electrical component, and the sample temperature rise balance time corresponding to the sample current.

[0089] The controller may store the resistance of the electrical component in advance, and each sample temperature rise balance time is the time taken by the electrical component to reach temperature rise balance under the corresponding sample current. The controller may determine the sample heat generated by the electrical component under the sample current based on the square of the sample current, the resistance of the electrical component, and the product of the sample temperature rise balance time corresponding to the sample current.

[0090] Optionally, the i-th sample current I among the multiple sample currents Yi The corresponding sample heat generation heat Q Yi satisfy:

[0091] Q Yi=I Yi 2 RT Yi ······(Formula 1)

[0092] Where R is the resistance of the electrical component, T Yi is the value of the i-th sample current I Yi The corresponding sample temperature rise equilibrium time, i is an integer greater than or equal to 1.

[0093] Optionally, after the electrical component starts to pass current, if the temperature rise difference at multiple consecutive moments is less than or equal to a temperature rise threshold, it can be considered that the electrical component has reached temperature rise balance. For example, the temperature rise threshold may be 0.001 degrees Celsius.

[0094] During the test phase, a temperature sensor can be set on the electrical component. For each sample current, the controller controls the current of the electrical component to be the sample current, collects the temperature of the electrical component through the temperature sensor, determines the moment when the temperature reaches the thermal equilibrium temperature of the electrical component as the end moment, determines the moment when the current starts to be provided to the electrical component as the start moment, and determines the difference between the end moment and the start moment as the sample temperature rise equilibrium time corresponding to the sample current. In this way, multiple sample currents and multiple sample temperature rise equilibrium times can be obtained. Among them, when the electrical component reaches temperature rise equilibrium, it can be considered that the electrical component reaches a thermal equilibrium state, that is, the temperature of the electrical component remains unchanged. For example, assuming that the electrical component is a relay, the thermal equilibrium temperature of the relay can be 108 degrees Celsius.

[0095] Figure 4 A curve diagram showing the relationship between a sample current and a sample temperature rise equilibrium time of a relay provided by an embodiment of the present invention. Figure 4 The horizontal axis of the curve is the sample current in amperes (A), and the vertical axis is the sample temperature rise equilibrium time in seconds (s). Figure 4 It can be seen that the larger the sample current, the shorter the corresponding sample temperature rise equilibrium time.

[0096] Figure 5 A sample current of a relay and a data table corresponding to the sample current are provided in an embodiment of the present invention. Figure 5 Only 5 sample currents and 5 sample temperature rise equilibrium times are shown, refer to Figure 5The five sample currents may be 200A, 300A, 400A, 500A and 600A respectively. The sample temperature rise balance time corresponding to the sample current 200A is 360s, the sample temperature rise balance time corresponding to the sample current 300A is 159s, the sample temperature rise balance time corresponding to the sample current 400A is 64.6s, the sample temperature rise balance time corresponding to the sample current 500A is 45.6s, and the sample temperature rise balance time corresponding to the sample current 600A is 25.8s. The resistance of the electrical component is R.

[0097] For each sample current, the controller can determine the sample heat generation corresponding to the sample current based on the resistance of the electrical component, the sample current, the sample temperature rise balance time corresponding to the sample current, and the above formula 1. Figure 5 The controller is based on the resistance R of the electrical components, the sample current is 300A, the sample temperature rise balance time is 159s, and the sample heat generation Q determined by formula 1 Y Therefore, the controller can obtain 5 sample heat generation values ​​corresponding to the 5 sample currents, and the 5 sample heat generation values ​​are 14400000R, 14310000R, 10336000R, 11400000R and 9288000R respectively.

[0098] Step A2: determining the heat dissipation power of multiple samples based on the heat generated by the multiple samples.

[0099] After the controller obtains the heat generated by the multiple samples, it can determine the heat dissipation powers of the multiple samples based on the heat generated by the multiple samples, and the heat generated by the multiple samples correspond to the heat dissipation powers of the multiple samples one by one.

[0100] Optionally, for each sample heat generation amount, the controller may determine a second sample heat dissipation amount based on the difference between the sample heat generation amount and the target heat absorption amount, and determine a sample heat dissipation power corresponding to the sample heat generation amount based on a second ratio of the second sample heat dissipation amount to the sample temperature rise equilibrium time corresponding to the sample heat generation amount. The target heat absorption amount is the heat absorbed by the electrical component to achieve temperature rise equilibrium.

[0101] The controller may determine the difference between the sample heat generation amount and the target heat absorption amount as the second sample heat dissipation amount, and may determine the second ratio as the sample heat dissipation power corresponding to the sample heat generation amount.

[0102] Based on the heat generated by the i-th sample Q Yi The heat dissipated by the second sample is determined to be Q YS2i Can satisfy:

[0103] Q YS2i =Q Yi -Q M······(Formula 2)

[0104] Among them, Q M Absorbs heat for the target.

[0105] Based on the heat dissipation Q of the second sample i YS2i The determined sample heat dissipation power P Yi Can satisfy:

[0106]

[0107] Optionally, after obtaining the heat generated by multiple samples, the controller can determine the minimum value of the temperature rise equilibrium time of multiple samples, and determine the heat generated by the sample corresponding to the minimum value as the target heat absorption heat.

[0108] It is understandable that the smaller the temperature rise balance time of the electrical component is, the smaller the heat dissipation heat of the electrical component is. Therefore, when the temperature rise balance time is small, the heat dissipation heat of the electrical component can be ignored relative to the heat generated by the electrical component, that is, the heat dissipation heat is 0. In the embodiment of the present invention, the sample heat dissipation heat corresponding to the minimum value of the temperature rise balance time of multiple samples is small, so the sample heat dissipation heat can be ignored relative to the sample heat generated by the minimum value. The controller can determine the sample heat generated by the minimum value as the target heat absorption heat, thereby obtaining the heat absorbed by the electrical component to achieve temperature rise balance.

[0109] refer to Figure 5 ,Since the minimum value of the temperature rise balance time of the five samples is 25.8s, the controller can determine the sample heat generation heat of 9288000R corresponding to the sample temperature rise balance time of 25.8s as the target heat absorption heat.

[0110] For each sample heat generation amount, the controller can determine a second sample heat dissipation amount and a sample heat dissipation power corresponding to the sample heat generation amount based on the sample heat generation amount, the target heat absorption amount, Formula 2, and Formula 3. For example, the second sample heat dissipation amount corresponding to the sample heat generation amount 14310000R determined based on Formula 2 is 5022000R, and the sample heat dissipation power determined based on Formula 3 is 31585R.

[0111] Thus, the heat dissipation of the five second samples is obtained, which are 5112000R, 5022000R, 1048000R, 2112000R and 0 respectively, and then the heat dissipation power of the five samples is obtained, which are 14200R, 31584R, 16222R, 46315R and 0 respectively.

[0112] Step A3: determining a preset heat dissipation power of the electrical component based on a plurality of sample heat dissipation powers.

[0113] After determining a plurality of sample heat dissipation powers, the controller may determine a preset heat dissipation power of the electrical component based on the plurality of sample heat dissipation powers.

[0114] In an optional implementation of the embodiment of the present invention, the controller may determine a plurality of target sample heat dissipation powers from a plurality of sample heat dissipation powers, and determine a preset heat dissipation power of the electrical component based on an average value of the plurality of target sample heat dissipation powers.

[0115] The controller may determine the average of the heat dissipation powers of the multiple target samples as the preset heat dissipation power of the electrical component, and after determining the average of the heat dissipation powers of the multiple target samples, if the average is not an integer, the controller may round the average.

[0116] Among them, the minimum value of multiple target sample heat dissipation powers is greater than the minimum value of multiple sample heat dissipation powers. The controller can remove the minimum value of multiple sample heat dissipation powers, and can determine the remaining multiple sample heat dissipation powers as the target sample heat dissipation powers, or can determine some of the remaining multiple sample heat dissipation powers as the target sample heat dissipation powers. This scheme does not make specific limitations, and it can be determined according to actual conditions when actually used.

[0117] refer to Figure 5 , the heat dissipation powers of multiple target samples can be 14200R, 31584R, 16222R and 46315R, and the preset heat dissipation power is 27080R. Alternatively, the heat dissipation powers of multiple target samples can be 31584R, 16222R and 46315R, and the preset heat dissipation power is 31373R.

[0118] In another optional implementation of the embodiment of the present invention, the controller may determine an average value of a plurality of sample heat dissipation powers as a preset heat dissipation power of the electrical component.

[0119] After determining the average of the heat dissipation powers of the multiple samples, the controller may round the average if the average is not an integer. Figure 5 , the heat dissipation powers of multiple samples can be 14200R, 31584R, 16222R, 46315R and 0, and the preset heat dissipation power is 21664R.

[0120] Step A4: determine the heat absorbed by multiple samples.

[0121] After the controller determines the preset heat dissipation power of the electrical component based on the multiple sample heat dissipation powers, the controller can determine the multiple sample heat absorption heats.

[0122] For each sample temperature rise balance time, the controller can determine the product of the sample temperature rise balance time and the preset heat dissipation power to obtain the first sample heat dissipation heat. The heat generated by each sample and the difference between the first sample heat dissipation heat corresponding to the sample heat generated heat are used to obtain the sample heat absorption heat.

[0123] Optionally, the temperature rise equilibrium time T of the i-th sample Yi The corresponding heat dissipation of the first sample is Q YS1i satisfy:

[0124] Q YS1i =P YS T Yi ······(Formula 4)

[0125] Among them, P YS The preset heat dissipation power.

[0126] Optionally, the heat generated by the i-th sample Q Yi The corresponding sample endothermic heat Q Xi satisfy:

[0127] Q Xi =Q Yi -Q YS1i ······(Formula 5)

[0128] refer to Figure 5 For each sample temperature rise balance time, the controller can determine the product of the sample temperature rise balance time and the preset heat dissipation power based on the above formula 4 to obtain 5 first sample heat dissipation heats. The 5 first sample heat dissipation heats are 9749160R, 4305879R, 1749432R, 1234893R, and 698689R respectively.

[0129] Based on the above formula 5, the heat generated by each sample, and the heat dissipated by the first sample corresponding to the heat generated by the sample, the heat absorbed by five samples can be determined. The heat absorbed by the five samples are 4650840R, 10004121R, 8586568R, 10165107R, and 8589311R respectively.

[0130] Step A5: determining a first preset heat accumulation value based on the heat absorbed by the multiple samples.

[0131] After the controller determines the heat absorbed by the multiple samples based on the preset heat dissipation power, it can determine a first preset heat accumulation value based on the heat absorbed by the multiple samples.

[0132] In an optional implementation of the embodiment of the present invention, the controller may determine a plurality of target sample heat absorption quantities from a plurality of sample heat absorption quantities, and determine a first preset heat accumulation value based on an average of the heat absorption quantities of the plurality of target samples.

[0133] Optionally, the controller may determine an average value of the heat absorbed by the plurality of target samples as the first preset heat accumulation value. The minimum value of the heat absorbed by the plurality of target samples is greater than the minimum value of the heat absorbed by the plurality of samples.

[0134] The controller can remove the minimum value of the heat absorption of multiple samples and determine the remaining heat absorption of multiple samples as the target sample heat absorption, or it can determine the heat absorption of some samples among the remaining multiple sample heat absorption as the target sample heat absorption. This scheme does not make specific limitations and can be determined according to actual conditions in actual use.

[0135] After determining the average of the heat absorbed by the plurality of target samples, the controller may round the average if the average is not an integer.

[0136] refer to Figure 5 , the heat absorption of the multiple samples may be 4650840R, 10004121R, 8586568R, 10165107R and 8589311R, the heat absorption of the multiple target samples may be the average of 10004121R, 8586568R, 10165107R and 8589311R, and the first preset heat accumulation value may be 9336277R. Alternatively, the heat absorption of the multiple target samples may be the average of 10004121R, 10165107R and 8589311R, and the first preset heat accumulation value may be 9586180R.

[0137] In another optional implementation of the embodiment of the present invention, the controller may determine the first preset heat accumulation value based on the average of the heat absorbed by multiple samples.

[0138] After determining the average of the heat absorption amounts of the multiple samples, the controller may round the average if the average is not an integer.

[0139] refer to Figure 5 The heat absorption values ​​of the multiple samples may be 4650840R, 10004121R, 8586568R, 10165107R and 8589311R, and the first preset heat accumulation value may be the average of the multiple heat absorption values, that is, the first preset heat accumulation value is 8399189R.

[0140] Step A6: Determine a second preset heat accumulation value.

[0141] After determining the first preset heat accumulation value based on the heat absorbed by the plurality of samples, the controller may determine the second preset heat accumulation value.

[0142] Optionally, the process of the controller determining the second preset heat accumulation value may include the following steps B1 to B3:

[0143] Step B1, obtaining the heat capacity of the electrical component and the preset temperature reduction amount.

[0144] The controller may obtain the heat capacity of the electrical component and a preset temperature reduction amount. The controller may store the preset temperature reduction amount in advance. For example, the temperature reduction amount may be 20 Kelvin (K).

[0145] Optionally, the controller may determine the heat capacity of the electrical component based on a first ratio of a first preset heat accumulation value to a preset temperature rise amount, wherein the preset temperature rise amount is the change in the temperature of the electrical component from a reference temperature to a thermal equilibrium temperature of the electrical component. The controller may store a reference temperature, which may be the current room temperature.

[0146] The heat capacity C can satisfy:

[0147]

[0148] Wherein, Q1 is the first preset heat accumulation value, and ΔT1 is the preset temperature rise amount.

[0149] After determining the thermal capacity value, the controller may round the thermal capacity value if the thermal capacity value is not an integer.

[0150] Step B2: determining a heat reduction value based on the product of the heat capacity and the preset temperature reduction amount.

[0151] After the controller obtains the thermal capacity of the electrical component and the preset temperature reduction amount, the controller may determine the heat reduction value based on the product of the thermal capacity and the preset temperature reduction amount.

[0152] The controller may determine the product of the heat capacity and the preset temperature reduction as the heat reduction value, and the heat reduction value ΔQ may satisfy:

[0153] ΔQ=CΔT2······ (Formula 7)

[0154] Wherein, ΔT2 is the preset temperature reduction amount.

[0155] Step B3: determine the difference between the first preset heat accumulation value and the heat reduction value as the second preset heat accumulation value.

[0156] After the controller determines the heat reduction value based on the product of the heat capacity and the preset temperature reduction amount, the controller can determine the difference between the first preset heat accumulation value and the heat reduction value as the second preset heat accumulation value.

[0157] Optionally, the second preset heat accumulation value Q2 satisfies:

[0158] Q2=Q1-ΔQ ······ (Formula 8)

[0159] Taking the preset temperature rise ΔT1 as 80K, the preset temperature drop ΔT2 as 20K, and the first preset heat accumulation value Q1 as 8399189R as an example, based on Formula 6 and Formula 7, the controller can determine the heat reduction value ΔQ as 2099797R. Based on Formula 8, the controller can determine the second preset heat accumulation value Q2=8399189R-2099797R=6299392R.

[0160] Step A7: Determine the preset current.

[0161] After the controller determines the second preset heat accumulation value, it can determine the preset current.

[0162] Optionally, the controller may determine a third ratio of a preset heat dissipation power to a resistance of the electrical component, and determine a preset current based on a square root of the third ratio.

[0163] Optionally, the controller may determine the square root of the third ratio as a preset current, where the preset current I YS Can satisfy:

[0164]

[0165] After determining the preset current value, the controller may round the preset current value if the preset current value is not an integer.

[0166] For example, assuming that the preset heat dissipation power P YS is 27080R, then based on Formula 9 the controller can determine the preset current I YS It is 164A.

[0167] Based on the preset current I YS , preset heat dissipation power P YS , the first preset heat accumulation value Q1, the resistance value R of the electrical component and the time t0 can be determined by the following formula 10:

[0168] (I YS 2 RP YS )t0=Q1······(Formula 10)

[0169] Based on formula 10, it can be determined that:

[0170] Among them, when t0 tends to infinity, tends to 0, at this point, it can be regarded as Thus, the above formula 9 can be determined. When the current of the electrical component is the preset current, the temperature of the electrical component can be stabilized at its thermal equilibrium temperature.

[0171] In an embodiment of the present invention, the controller can also pre-store the preset heat dissipation power, the first preset heat accumulation value, the second preset heat accumulation value and the preset current of the electrical component, and directly obtain the pre-stored preset heat dissipation power, the first preset heat accumulation value, the second preset heat accumulation value and the preset current during actual use.

[0172] Step 202: Determine whether the real-time current of the electrical component reaches a preset current.

[0173] During the actual use of the battery pack, no temperature sensor is provided in the electrical component. During the discharge or charging process of the battery in the battery pack, the controller can periodically obtain the real-time current of the electrical component and determine whether the real-time current of the electrical component reaches the preset current. If the real-time current of the electrical component reaches the preset current, it can be determined that the temperature of the electrical component is high, so step 203 can be executed. If the real-time current of the electrical component does not reach the preset current, the real-time current of the electrical component can continue to be obtained, and it can be determined whether the real-time current of the electrical component reaches the preset current.

[0174] Step 203: Determine the real-time heat accumulation value of the electrical component.

[0175] When the controller determines that the real-time current of the electrical component reaches the preset current, the real-time heat accumulation value of the electrical component can be determined, wherein the real-time heat accumulation value is the heat accumulation value between the reference time and the time when the real-time heat accumulation value is determined, and the reference time is the time when the real-time current reaches the preset current.

[0176] Optionally, the controller may obtain the real-time heat absorption of the electrical component at each of the multiple moments, and determine the sum of the real-time heat absorption at the multiple moments as the real-time heat accumulation value of the electrical component. The reference moment may be the earliest moment among the multiple moments, and the determination moment may be the latest moment among the multiple moments. The determination moment may be any moment after the reference moment, that is, the controller may determine the real-time heat absorption of the electrical component in real time or periodically after the reference moment.

[0177] For each of the multiple moments, the controller can obtain the real-time current of the electrical component at that moment, determine the real-time heat generation of the electrical component at that moment based on the time difference, the resistance of the electrical component and the real-time current at that moment, determine the real-time heat dissipation heat based on the product of the preset heat dissipation power and the time difference, and determine the difference between the real-time heat generation and the real-time heat dissipation as the real-time heat absorption of the electrical component at that moment. The starting moment of the time difference is the moment before and adjacent to the moment among the multiple moments, and the ending moment of the time difference is the moment.

[0178] The controller can use the product of the square of the real-time current at that moment, the time difference, and the resistance of the electrical component as the first product, the product of the preset heat dissipation power and the time difference as the second product, and determine the difference between the first product and the second product as the real-time heat generation of the electrical component at the moment. That is, the real-time heat generation Q at the moment can satisfy:

[0179]

[0180] Wherein, I may be the real-time current, t1 may be the starting time of the time difference, and t2 may be the ending time of the time difference.

[0181] It is understandable that after the real-time current of the electrical component reaches the preset current, the real-time current of the electrical component will still increase. The time difference between any two adjacent moments in the above multiple moments can be less than the difference threshold, thereby ensuring that the real-time current of the electrical component remains unchanged within the time difference. And the real-time current of the electrical component can be different within different time differences. And, if it is the first moment among multiple moments, the starting moment of the time difference can be 0.

[0182] In the first time period before the real-time current reaches the preset current, since the current of the electrical component is low, it can be considered that the heat absorbed by the electrical component at each moment in the first time period is small, and further it can be considered that before the real-time current reaches the preset current, the heat accumulation value of the electrical component is 0.

[0183] After the real-time current reaches the preset current and in the second period before the real-time current drops to the preset current, it can be seen from the above formula 9 and formula 12 that when the real-time current is equal to the preset current, (I YS 2 RP YS )=0, after the real-time current is greater than the preset current, since the real-time current is greater than the preset current, (I 2 RP YS ) is greater than 0, so at each moment in the second time period, the real-time heat absorption heat of the electrical component is a positive number, so the real-time heat accumulation value calculated at each moment is greater than 0, and the real-time heat accumulation value continues to increase.

[0184] Assuming the preset current of the relay is 164A, Figure 6 A diagram showing the relationship between the real-time heat accumulation value and time of a relay provided by an embodiment of the present invention. Figure 6 The horizontal axis of the relationship diagram is time, and the vertical axis is real-time current. Figure 6 It can be seen that the real-time current of the relay reaches the preset current at time t1, and the real-time heat accumulation value of the relay is determined from time t1.

[0185] Step 204: determine whether the real-time heat accumulation value reaches a first preset heat accumulation value.

[0186] After the controller determines the real-time heat accumulation value of the electrical component, it can determine whether the real-time heat accumulation value reaches the first preset heat accumulation value. If the real-time heat accumulation value reaches the first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, so step 205 can be executed. If the real-time heat accumulation value does not reach the first preset heat accumulation value, step 203 is continued.

[0187] Step 205: Reduce the current of the electrical components.

[0188] If the controller determines that the real-time heat accumulation value reaches the first preset heat accumulation value, the current of the electrical component can be reduced to make the real-time heat accumulation value less than the first preset heat accumulation value.

[0189] After the real-time current drops to the preset current, since the real-time current is less than the preset current, (I 2 RO YS ) is less than 0, so the real-time heat absorption heat calculated at each moment after the real-time current drops to the preset current is less than 0, and accordingly, the real-time heat accumulation value calculated at each moment is lower than that of the moment before and adjacent to the moment. Thus, by reducing the current of the electrical component to below the preset current, the real-time heat accumulation of the electrical component is reduced.

[0190] refer to Figure 6 At time t2, the real-time heat accumulation value of the relay (i.e., Q1) reaches the first preset heat accumulation value. Since the real-time current of the relay continues to increase from time t1 to time t2, the real-time current of the relay is greater than 164A at time t2, and Q1 is greater than 0. The controller starts to reduce the current from time t2.

[0191] Step 206: Determine whether the real-time heat accumulation value reaches a second preset heat accumulation value.

[0192] After reducing the current of the electrical component, the controller can determine whether the real-time heat accumulation value reaches a second preset heat accumulation value, wherein the second preset heat accumulation value is less than the first preset heat accumulation value.

[0193] If the real-time heat accumulation value reaches the second preset heat accumulation value, step 207 may be performed. If the real-time heat accumulation value does not reach the second preset heat accumulation value, step 206 may be performed.

[0194] Step 207: Stop reducing the current of the electrical component.

[0195] If the controller determines that the real-time heat accumulation value reaches the second preset heat accumulation value, it can stop reducing the current of the electrical component. In this way, the use efficiency of the electrical component can be guaranteed, and the electrical component can be prevented from losing the ability to work normally due to too low current, and the situation where the electrical component cannot operate normally or even cannot start can be reduced, so as to avoid affecting the customer experience.

[0196] refer to Figure 6 At time t4, the real-time heat accumulation value of the relay (ie, the sum of Q1, Q2 and Q3) reaches the second preset heat accumulation value, and the current reduction stops from time t4.

[0197] Among them, since the real-time current of the relay is still greater than 164A from time t2 to time t3, the real-time heat accumulation value of the relay from time t2 to time t3 (i.e., Q2) is still greater than 0. From time t3 to time t4, since the real-time current of the electrical component is less than 164A, the heat accumulation value Q3 from time t3 to time t4 is less than 0.

[0198] After the controller stops reducing the current of the electrical component, step 204 can be continued to be executed to continue to determine whether the real-time heat accumulation value reaches the first preset heat accumulation value, so as to avoid the electrical component from having excessive heat again and reduce safety hazards.

[0199] This solution is applicable to both the charging process and the discharging process of the battery pack. In actual use, it is only necessary to adjust the preset heat dissipation power, the first preset heat accumulation value, the second preset heat accumulation value and the preset current of the corresponding electrical components according to actual conditions.

[0200] In the embodiment of the present invention, there is no need to add a temperature monitoring device to the electrical component. The real-time current and real-time heat accumulation of the target electrical component can be monitored only by software monitoring. When the real-time current of the target electrical component reaches the preset current, if the real-time heat accumulation value reaches the first preset heat accumulation value, it can be determined that the electrical component has been working at high temperature for a long time. Therefore, the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of electrical components working at high temperatures for a long time, and further avoid the problem of the plastic shell of the electrical component melting, resulting in insulation failure of the electrical component and high-voltage safety failure, thereby extending the service life of the electrical component. If the electrical component is a fuse, by using the method provided in the embodiment of the present invention, the problem of fuse disconnection caused by continuous high temperature can be avoided, thereby avoiding the subsequent replacement of the distribution box and reducing costs.

[0201] In the embodiment of the present invention, since the real-time current and real-time heat accumulation of the target electrical component can be monitored only by software monitoring, there is no need to select electrical components equipped with temperature monitoring devices when selecting the target electrical components, thereby effectively reducing the hardware cost of the electrical components.

[0202] In the embodiment of the present invention, when the real-time heat accumulation value of the electrical component reaches the second preset heat accumulation value, the current of the electrical component stops being reduced, but the current of the electrical component is not reduced all the time. Thus, while ensuring that the current of the electrical component is within a safe range, the efficiency of the electrical component is also ensured, and the electrical component is prevented from losing its ability to work normally due to too low current, and the situation where the electrical component cannot operate normally or even cannot be started is reduced, thereby avoiding affecting the customer experience.

[0203] The solution provided by the embodiment of the present invention can monitor the temperature of all electrical components of the battery pack (i.e., electrical components with temperature monitoring devices and electrical components without temperature monitoring devices). For example, all electrical components such as fuses, relays, pre-charge resistors and high-voltage connectors with high heat generation can be monitored. Alternatively, only the temperature of electrical components without temperature monitoring devices can be monitored. If it is necessary to monitor the temperature of multiple reference electrical components in the battery pack, the controller can determine the preset current of each reference electrical component in the above step 201, and determine the target reference electrical component with the smallest preset current from the multiple reference electrical components based on the preset currents of the multiple reference electrical components, and then determine the preset heat dissipation power, the first preset heat accumulation value and the second preset heat accumulation value of the target reference electrical component. Since the preset current of the target reference electrical component is the smallest, the electrical component in steps 202 to 207 is the target reference electrical component, and the controller only needs to monitor the temperature of the target reference electrical component among the multiple reference electrical components in the battery pack to achieve the purpose of monitoring the temperature of all reference electrical components.

[0204] Figure 7 A graph showing the relationship between the real-time current and time of a relay provided by an embodiment of the present invention. Figure 7 The horizontal axis of the curve is time, and the vertical axis is real-time current. The curve is obtained by using the method provided by the embodiment of the present invention. Figure 7 As can be seen from the figure, assuming that the preset current is 250A, at the time of 100s, the controller detects that the real-time current is greater than the preset current, so the real-time heat accumulation value can be determined, and when the real-time heat accumulation value reaches the first preset heat accumulation value, the current of the electrical component is reduced, so as to Figure 7 It can be seen that at the time of 200s, the current of the electrical components is reduced to less than 250A.

[0205] Between 200s and 300s, the controller detects again that the real-time current is greater than the preset current, and the real-time heat accumulation value reaches the first preset heat accumulation value, so the controller can reduce the current of the electrical component again, thereby Figure 7It can be seen that at the time of 300s, the current of the electrical component is reduced to less than 250 A again. In this way, the controller can periodically reduce the current of the electrical component in time when the real-time current is greater than the preset current and the real-time heat accumulation value reaches the first preset heat accumulation value.

[0206] Figure 8 A graph showing the relationship between the real-time temperature and time of a relay provided by an embodiment of the present invention. Figure 8 The horizontal axis of the curve is time, and the vertical axis is real-time temperature. The curve is obtained by using the method provided by the embodiment of the present invention. Figure 8 It can be seen that at the time of 390s, the relay starts to cool down.

[0207] In summary, an embodiment of the present invention provides a current control method for an electrical component in a battery pack, in which a controller determines a real-time heat accumulation value of the electrical component when the real-time current of the electrical component reaches a preset current. The real-time heat accumulation value is a heat accumulation value between a reference moment and a determination moment of the real-time heat accumulation value, and the reference moment is the moment when the real-time current reaches the preset current. If the real-time heat accumulation value reaches a first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, so the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of the electrical component working at a high temperature for a long time, and further avoid the problem of the plastic shell of the electrical component melting, resulting in insulation failure of the electrical component and high-voltage safety failure, thereby extending the service life of the electrical component.

[0208] Furthermore, since the controller determines the real-time heat accumulation value of the electrical component and determines whether to reduce the current of the electrical component based on whether the real-time heat accumulation value reaches a first preset heat accumulation value, there is no need to add a temperature monitoring device to the electrical component, and there is no need to determine whether to reduce the current of the electrical component based on the temperature collected by the temperature monitoring device, thereby effectively reducing the cost of temperature monitoring of the electrical component.

[0209] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the current control method of the electrical components in the battery pack shown in the above embodiment is implemented. For example, Figure 1 or Figure 2 A current control method for electrical components in a battery pack is shown.

[0210] Fig. 9 is a schematic diagram of the structure of a controller provided by an embodiment of the present invention, such as Fig. 9As shown, the controller 90 includes a memory 901, a processor 902, and a computer program stored in the memory 901 and executable on the processor 902. When the processor 902 executes the computer program, the current control method of the electrical components in the battery pack of the above embodiment is implemented. For example, Figure 1 or Figure 2 A current control method for electrical components in a battery pack is shown.

[0211] Fig.10 is a block diagram of a current control device for an electrical component in a battery pack provided by an embodiment of the present invention, such as Fig.10 As shown, the device comprises:

[0212] A determination module 1001 is used to determine a real-time heat accumulation value of the electrical component when the real-time current of the electrical component reaches a preset current, the real-time heat accumulation value being a heat accumulation value between a reference time and a determination time of the real-time heat accumulation value, the reference time being a time when the real-time current reaches the preset current;

[0213] The adjustment module 1002 is used to reduce the current of the electrical component if the real-time heat accumulation value reaches the first preset heat accumulation value, so that the real-time heat accumulation value is lower than the first preset heat accumulation value.

[0214] Optionally, after reducing the current of the electrical component, the adjustment module 1002 is used to:

[0215] If the real-time heat accumulation value reaches a second preset heat accumulation value, the current of the electrical component is stopped from being reduced, and the second preset heat accumulation value is less than the first preset heat accumulation value.

[0216] Optional, reference Fig.11 The device may further include an acquisition module 1003, configured to:

[0217] Obtain the thermal capacity of electrical components and the preset temperature reduction amount;

[0218] determining a heat reduction value based on a product of the heat capacity and a preset temperature reduction amount;

[0219] The difference between the first preset heat accumulation value and the heat reduction value is determined as the second preset heat accumulation value.

[0220] Optionally, the acquisition module 1003 is used to:

[0221] Determining the heat capacity of the electrical component based on a first ratio of a first preset heat accumulation value to a preset temperature rise amount;

[0222] The preset temperature rise amount is the change amount of the temperature of the electrical component from the reference temperature to the thermal equilibrium temperature of the electrical component.

[0223] Optionally, the acquisition module 1003 is used to:

[0224] Obtaining a preset heat dissipation power and heat generated by multiple samples, wherein the heat generated by the multiple samples corresponds to the temperature rise equilibrium time of the multiple samples one by one;

[0225] For each sample temperature rise equilibrium time, determine the product of the sample temperature rise equilibrium time and the preset heat dissipation power to obtain the first sample heat dissipation heat;

[0226] Determine the heat generated by each sample and the difference between the heat generated by the sample and the heat dissipated by the first sample corresponding to the heat generated by the sample, and obtain the heat absorbed by the sample;

[0227] A first preset heat accumulation value is determined based on the heat amounts absorbed by the plurality of samples.

[0228] Optionally, the acquisition module 1003 is used to:

[0229] Determining a plurality of target sample endothermic heats from a plurality of sample endothermic heats, wherein a minimum value of the plurality of target sample endothermic heats is greater than a minimum value of the plurality of sample endothermic heats;

[0230] A first preset heat accumulation value is determined based on an average value of heat absorbed by a plurality of target samples.

[0231] Optionally, the acquisition module 1003 is used to:

[0232] For each sample heat generation amount, determine a second sample heat dissipation amount based on the difference between the sample heat generation amount and the target heat absorption amount, and determine the sample heat dissipation power based on a second ratio of the second sample heat dissipation amount to the sample temperature rise equilibrium time corresponding to the sample heat generation amount;

[0233] A preset heat dissipation power of the electrical component is determined based on a plurality of sample heat dissipation powers.

[0234] Optionally, the acquisition module 1003 is used to:

[0235] Determining a plurality of target sample heat dissipation powers from a plurality of sample heat dissipation powers, wherein a minimum value of the plurality of target sample heat dissipation powers is greater than a minimum value of the plurality of sample heat dissipation powers;

[0236] The preset heat dissipation power of the electrical component is determined based on an average value of the heat dissipation powers of a plurality of target samples.

[0237] Optionally, after obtaining the heat generated by multiple samples, the obtaining module 1003 is used to:

[0238] Determine the minimum value of the temperature rise equilibrium time of multiple samples;

[0239] The sample heat generation heat corresponding to the minimum value is determined as the target heat absorption heat.

[0240] Optionally, the acquisition module 1003 is used to:

[0241] Obtain multiple sample currents and multiple sample temperature rise balance times, where each sample temperature rise balance time is the time taken for the electrical component to reach temperature rise balance under the corresponding sample current;

[0242] For each sample current, a sample heat amount generated by the electrical component under the sample current is determined based on the sample current, the resistance value of the electrical component, and a sample temperature rise equilibrium time corresponding to the sample current.

[0243] Optionally, the acquisition module 1003 is used to:

[0244] Determining a third ratio of a preset heat dissipation power to a resistance value of the electrical component;

[0245] Based on the square root of the third ratio, a preset current is determined.

[0246] Optionally, the determination module 1001 is used to:

[0247] Obtaining the real-time heat absorption of the electrical component at each of the multiple moments, the reference moment being the earliest moment among the multiple moments, and the determined moment being the latest moment among the multiple moments;

[0248] The sum of the real-time heat absorption heat at multiple moments is determined as the real-time heat accumulation value of the electrical component.

[0249] Optionally, the determination module 1001 is used to:

[0250] For each moment, obtain the real-time current of the electrical components at that moment;

[0251] Based on the time difference, the resistance of the electrical component and the real-time current of the electrical component at time , determine the real-time heat generated by the electrical component at time , the starting time of the time difference is the time before and adjacent to time among the multiple time points, and the ending time of the time difference is time ;

[0252] Determine the real-time heat dissipation heat based on the product of the preset heat dissipation power and the time difference;

[0253] The difference between the real-time heat generation and the real-time heat dissipation is determined as the real-time heat absorption of the electrical component at the moment.

[0254] In summary, an embodiment of the present invention provides a current control device for an electrical component in a battery pack, in which a controller can determine that the temperature of the electrical component is high when the real-time current of the electrical component reaches a preset current, and thus determine the real-time heat accumulation value of the electrical component, the real-time heat accumulation value being the heat accumulation value between a reference moment and a determination moment of the real-time heat accumulation value, the reference moment being the moment when the real-time current reaches the preset current. If the real-time heat accumulation value reaches a first preset heat accumulation value, it can be determined that the electrical component has been working at a high temperature for a long time, and thus the current of the electrical component can be reduced so that the real-time heat accumulation value is less than the first preset heat accumulation value. This can effectively avoid the problem of the electrical component working at a high temperature for a long time, and further avoid the problem of the plastic shell of the electrical component melting, resulting in insulation failure of the electrical component and high-voltage safety failure, thereby extending the service life of the electrical component.

[0255] Furthermore, since the controller determines the real-time heat accumulation value of the electrical component and determines whether to reduce the current of the electrical component based on whether the real-time heat accumulation value reaches a first preset heat accumulation value, there is no need to add a temperature monitoring device to the electrical component, and there is no need to determine whether to reduce the current of the electrical component based on the temperature collected by the temperature monitoring device, thereby effectively reducing the cost of temperature monitoring of the electrical component.

[0256] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0257] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0258] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0259] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0260] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0261] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific implementation situation.

[0262] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0263] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for controlling current of an electrical component in a battery pack, characterized in that: The method comprises: When the real-time current of the electrical component reaches a preset current, determining a real-time heat accumulation value of the electrical component, the real-time heat accumulation value being a heat accumulation value between a reference time and a time at which the real-time heat accumulation value is determined, the reference time being a time at which the real-time current reaches the preset current; If the real-time heat accumulation value reaches a first preset heat accumulation value, the current of the electrical component is reduced so that the real-time heat accumulation value is lower than the first preset heat accumulation value.

2. The method according to claim 1, characterized in that After reducing the current of the electrical component, the method further includes: If the real-time heat accumulation value reaches a second preset heat accumulation value, the current of the electrical component is stopped from being reduced, and the second preset heat accumulation value is less than the first preset heat accumulation value.

3. The method according to claim 2, characterized in that The method further comprises: Obtaining the thermal capacity and the preset temperature reduction amount of the electrical component; determining a heat reduction value based on a product of the heat capacity and the preset temperature reduction amount; The difference between the first preset heat accumulation value and the heat reduction value is determined as the second preset heat accumulation value.

4. The method according to claim 3, characterized in that Obtaining the heat capacity of the electrical component, comprising: determining, based on a first ratio of the first preset heat accumulation value to a preset temperature rise amount, a heat capacity of the electrical component; The preset temperature rise amount is the change amount of the temperature of the electrical component from the reference temperature to the thermal equilibrium temperature of the electrical component.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Obtaining a preset heat dissipation power and a plurality of sample heat generated, wherein the plurality of sample heat generated corresponds to a plurality of sample temperature rise equilibrium times one by one; For each of the sample temperature rise equilibrium time, determine the product of the sample temperature rise equilibrium time and the preset heat dissipation power to obtain the first sample heat dissipation heat; Determine the heat generated by each sample and the difference between the heat dissipated by the first sample and the heat generated by the sample, and obtain the heat absorbed by the sample; The first preset heat accumulation value is determined based on the heat absorbed by the plurality of samples.

6. The method according to claim 5, characterized in that Determining the first preset heat accumulation value based on the heat absorbed by the plurality of samples includes: Determine a plurality of target sample endothermic heats from the plurality of sample endothermic heats, wherein a minimum value of the plurality of target sample endothermic heats is greater than a minimum value of the plurality of sample endothermic heats; The first preset heat accumulation value is determined based on an average value of the heat absorbed by the plurality of target samples.

7. The method according to claim 5, characterized in that Get the preset heat dissipation power, including: For each of the sample heat generation amounts, determine a second sample heat dissipation amount based on the difference between the sample heat generation amount and the target heat absorption amount, and determine the sample heat dissipation power based on a second ratio of the second sample heat dissipation amount to the sample temperature rise equilibrium time corresponding to the sample heat generation amount; The preset heat dissipation power is determined based on a plurality of the sample heat dissipation powers.

8. The method according to claim 7, characterized in that Determining the preset heat dissipation power based on a plurality of the sample heat dissipation powers includes: Determining a plurality of target sample heat dissipation powers from the plurality of sample heat dissipation powers, wherein a minimum value of the plurality of target sample heat dissipation powers is greater than a minimum value of the plurality of sample heat dissipation powers; The preset heat dissipation power is determined based on an average value of the heat dissipation powers of a plurality of the target samples.

9. The method according to claim 7, characterized in that: After obtaining the heat generated by the multiple samples, the method further includes: Determining a minimum value of the temperature rise equilibrium time of a plurality of the samples; The sample heat generation amount corresponding to the minimum value is determined as the target heat absorption amount.

10. The method according to claim 5, characterized in that Obtain heat generation data for multiple samples, including: Acquire multiple sample currents and multiple sample temperature rise balance times, each sample temperature rise balance time being the time taken for the electrical component to reach temperature rise balance under the corresponding sample current; For each of the sample currents, a sample heat amount generated by the electrical component under the sample current is determined based on the sample current, the resistance value of the electrical component, and a sample temperature rise equilibrium time corresponding to the sample current.

11. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Determining a third ratio of a preset heat dissipation power to a resistance value of the electrical component; The preset current is determined based on the square root of the third ratio.

12. The method according to any one of claims 1 to 4, characterized in that: Determining the real-time heat accumulation value of the electrical component includes: Obtaining the real-time heat absorption amount of the electrical component at each of a plurality of moments, wherein the reference moment is the earliest moment among the plurality of moments, and the determined moment is the latest moment among the plurality of moments; The sum of the real-time heat absorption amounts at the multiple moments is determined as the real-time heat accumulation value of the electrical component.

13. The method according to claim 12, characterized in that Obtaining the real-time heat absorption amount of the electrical component at each of the multiple moments, including: For each of the moments, obtaining the real-time current of the electrical component at the moment; Based on the time difference, the resistance of the electrical component and the real-time current of the electrical component at the time, determine the real-time heat generated by the electrical component at the time, the starting time of the time difference is a time before and adjacent to the time among the multiple times, and the ending time of the time difference is the time; Determine the real-time heat dissipation heat based on the product of the preset heat dissipation power and the time difference; The difference between the real-time heat generation amount and the real-time heat dissipation amount is determined as the real-time heat absorption amount of the electrical component at the moment.

14. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, a current control method for an electrical component in a battery pack according to any one of claims 1-13 is implemented.

15. A controller, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, a current control method for an electrical component in a battery pack according to any one of claims 1 to 13 is implemented.

16. A current control device for an electrical component in a battery pack, characterized in that: The device comprises: a determination module, configured to determine a real-time heat accumulation value of the electrical component when the real-time current of the electrical component reaches a preset current, the real-time heat accumulation value being a heat accumulation value between a reference time and a determination time of the real-time heat accumulation value, the reference time being a time when the real-time current reaches the preset current; The adjustment module is used for reducing the current of the electrical component if the real-time heat accumulation value reaches a first preset heat accumulation value, so that the real-time heat accumulation value is lower than the first preset heat accumulation value.

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