Battery discharge control method, device, medium, and program product

Abstract

The application provides a battery discharge control method, device, medium and program product. The method comprises: periodically collecting the working state of the battery during the process of battery discharge; determining the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period; if the state change amount is greater than or equal to a preset threshold, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period; and controlling the battery to discharge by using the maximum discharge current in the current collection period. According to the method, the maximum discharge current can be determined according to the impedance value of the battery when the working state of the battery changes greatly, so that the maximum discharge current can be adjusted in time to avoid triggering the lower limit protection voltage set by the battery control system during the discharge of the battery, and the battery can be normally discharged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, and in particular to a battery discharge control method, device, medium and program product. BACKGROUND

[0002] Lithium ion batteries are widely used in electronic products, including smart phones, notebook computers, wearable devices, electric vehicles, etc., due to their high energy density, thinness and other characteristics.

[0003] Lithium batteries are prone to aging. In actual application, as the use time increases, the impedance of the battery gradually increases. In addition, the decrease of the application environment temperature also causes the impedance of the battery to temporarily increase. Under the premise that the fixed voltage of the battery is unchanged, large power discharge of the battery will cause the discharge current to increase. When the battery is aged to a certain extent or applied in a low temperature environment, the battery will have a serious polarization reaction when it is discharged at a large power due to the large impedance, causing the loss voltage inside the battery to increase. The increase of the loss voltage inside the battery will reduce the discharge voltage of the battery, which is easy to touch the lower limit protection voltage set by the battery control system. At this time, the battery control system will determine that the battery is in an empty state or over-discharged, and control the battery to stop discharging, resulting in that the battery cannot be normally used.

[0004] However, the existing battery control method cannot solve the problems caused by the above battery discharge. SUMMARY

[0005] The present application provides a battery discharge control method, device, medium and program product to solve the problem that the lower limit protection voltage is easily touched during battery discharge, resulting in that the battery cannot be normally discharged.

[0006] In a first aspect, the present application provides a battery discharge control method, comprising:

[0007] periodically collecting the working state of the battery during the discharge of the battery;

[0008] determining a state change amount between the working state of the battery in the current collection period and the working state of the battery in the previous collection period;

[0009] if the state change amount is greater than or equal to a preset threshold, determining a maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period;

[0010] using the maximum discharge current to control the battery to discharge in the current collection period.

[0011] In a possible implementation, the working state of the battery includes one or more of temperature, voltage, battery cycle number and battery storage time length.

[0012] Correspondingly, the determination of the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period specifically includes:

[0013] The determination of the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period includes one or more of a temperature difference value, a voltage difference value, a battery cycle number difference value, and a battery storage time length difference value.

[0014] In a possible implementation, if the state change amount is greater than or equal to a preset threshold value, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period, specifically including:

[0015] If any state change amount is greater than or equal to a preset threshold value corresponding to the state change amount, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period;

[0016] Or,

[0017] If each state change amount is greater than or equal to a preset threshold value corresponding to each state change amount, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period.

[0018] Or,

[0019] The weighted state change amount is determined according to each state change amount and a weight corresponding to each state change amount, and if the sum of the weighted state change amounts is greater than or equal to a preset threshold value, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period.

[0020] In a possible implementation, the determination of the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period specifically includes:

[0021] The voltage value and the impedance value of the battery in the current collection period are obtained.

[0022] The maximum discharge current of the battery is determined by using the following formula:

[0023]

[0024] Wherein, the I max represents the maximum discharge current, the DCIR1 represents the impedance value of the battery in the current collection period, the U1 represents the voltage value of the battery in the current collection period, the U0 represents a preset lower limit protection voltage value, and the a represents a preset control margin value, a>0.

[0025] In a possible implementation, the impedance value of the battery in the current collection cycle is calculated by using the following formula:

[0026] DCIR1=DCIR2(1+k)

[0027] wherein k represents the impedance growth rate, DCIR2 represents the design impedance value of the battery, DCIR2=aU1+bT1+c, T1 represents the temperature value of the battery in the current collection cycle, and a, b and c represent coefficients.

[0028] In a possible implementation, the impedance growth rate k is calculated by using the following formula:

[0029]

[0030] wherein DCIR3 represents the design impedance value of the battery at the beginning of the discharge in the previous collection cycle, DCIR3=aU2+bT2+c, U2 represents the voltage value of the battery at the beginning of the discharge in the previous collection cycle, and T2 represents the temperature value of the battery at the beginning of the discharge in the previous collection cycle; DCIR4 represents the impedance value of the battery after the first time length of discharge in the previous collection cycle, DCIR4=(|U3-U2|) / I, U3 represents the voltage value of the battery after the first time length of discharge in the previous collection cycle, and I represents the discharge current of the battery in the previous collection cycle.

[0031] In a possible implementation, after the battery is discharged by using the maximum discharge current, the method further includes:

[0032] outputting current update prompt information according to the maximum discharge current.

[0033] In a second aspect, the present application provides a battery discharge control device, comprising a processor and a memory connected with the processor in communication;

[0034] the memory stores computer execution instructions;

[0035] the processor executes the computer execution instructions stored in the memory to implement the method described above.

[0036] In a third aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to implement the method described above.

[0037] In a fourth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the method described above.

[0038] The battery discharge control method provided in the application can periodically collect the working state of the battery during the battery discharge process; determine the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period; if the state change amount is greater than or equal to a preset threshold, determine the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period; and control the battery to discharge by using the maximum discharge current in the current collection period. By determining the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period, the state change of the battery can be periodically determined. When the state change amount of the battery is greater than or equal to the preset threshold, it indicates that the working state of the battery changes greatly, and the actual impedance of the battery increases greatly. Therefore, the maximum discharge current corresponding to the current collection period needs to be determined according to the impedance value of the battery in the current collection period, and the battery is controlled to discharge by using the maximum discharge current in the current collection period. Through such a setting, when the actual impedance of the battery increases greatly, the maximum discharge current can be determined according to the impedance value of the battery, the discharge current of the battery is limited, the serious polarization reaction of the battery due to the too large discharge current is avoided, the loss voltage in the battery is reduced, and the lower limit protection voltage set by the battery control system is avoided when the battery is discharged due to the too large discharge current, so that the battery can be normally discharged. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0040] Figure 1 The system architecture diagram of an embodiment of the application;

[0041] Figure 2 The flowchart of the battery discharge control method of an embodiment of the application;

[0042] Figure 3 The flowchart of the battery discharge control method of another embodiment of the application;

[0043] Figure 4 The battery discharge control result schematic diagram of an embodiment of the application;

[0044] Figure 5 The structural schematic diagram of the battery discharge control device of an embodiment of the application.

[0045] Reference signs: 1, mobile phone; 2, battery; 3, battery control system.

[0046] The specific embodiments of the application have been shown by way of example in the above figures, and will be described in greater detail below. These figures and this written description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by reference to specific embodiments. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail with reference to the drawings, of which like reference numerals indicate like elements throughout the various figures. The following detailed description is not intended to restrict the scope of the application, as claimed, but rather to explain the concepts as set forth in the appended claims.

[0048] The discharge current of a lithium battery is related to the power of the application device, and the greater the power of the application device, the greater the discharge current of the battery. In the actual application process of the battery, the impedance of the battery gradually increases with the increase of the use time; in addition, the temporary increase of the impedance of the battery caused by the decrease of the application environment temperature. When the impedance of the battery is large, the battery will have a serious polarization reaction when discharging at a large current, resulting in a large internal loss voltage of the battery. The increase of the internal loss voltage of the battery will reduce the discharge voltage of the battery, and it is easy to touch the lower limit protection voltage set by the battery control system. At this time, the battery control system will determine that the battery is in an empty state or over-discharged, and control the battery to stop discharging, resulting in that the battery cannot be used normally.

[0049] However, in the prior art, the increase of the impedance of the battery during discharging cannot be monitored in real time. Moreover, since the power of the application device is fixed, the maximum discharge current of the battery of the application device is also fixed, and cannot be adjusted in time according to the change of the impedance of the battery, so that the maximum discharge current can be adjusted, which often leads to that the battery cannot be discharged normally in the actual application process.

[0050] The battery discharge control method provided in the application aims to solve the above technical problems of the prior art. The method can periodically collect the working state of the battery during the discharge of the battery; determine the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period; if the state change amount is greater than or equal to a preset threshold, determine the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period; and control the battery to discharge by using the maximum discharge current in the current collection period. By determining the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period, the state change of the battery can be periodically determined. When the state change amount of the battery is greater than or equal to the preset threshold, it indicates that the working state of the battery changes greatly, and the actual impedance of the battery increases greatly. Therefore, the maximum discharge current corresponding to the current collection period needs to be determined according to the impedance value of the battery in the current collection period, and the battery is controlled to discharge by using the maximum discharge current in the current collection period. Through such a setting, when the actual impedance of the battery increases greatly, the maximum discharge current can be determined according to the impedance value of the battery, the discharge current of the battery is limited, the serious polarization reaction of the battery due to the excessive discharge current is avoided, the loss voltage in the battery is reduced, and the lower limit protection voltage set by the battery control system is avoided when the battery is discharged, so that the battery can be normally discharged.

[0051] The technical solutions of the application and how the technical solutions solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the application will be described below with reference to the drawings.

[0052] Figure 1 is a system architecture diagram of an embodiment of the application, as Figure 1 shown in the figure, 1 is a mobile phone, 2 is a battery of the mobile phone, and 3 is a battery control system. During the process of discharging the battery 2 to provide power for the mobile phone 1, the battery control system 3 periodically collects the working state of the battery 2; determines the state change amount between the working state of the battery 2 in the current collection period and the working state in the previous collection period; if the state change amount is greater than or equal to a preset threshold, determines the maximum discharge current corresponding to the current collection period according to the impedance value of the battery 2 in the current collection period; and controls the battery 2 to discharge by using the maximum discharge current in the current collection period, and outputs current update prompt information to the mobile phone 1 according to the maximum discharge current to prompt the user that the battery control system is intelligently regulating and controlling the discharge current of the battery based on the battery life and the application environment, so that the user can take corresponding measures in time.

[0053] Embodiment one

[0054] Figure 2is a flowchart of a battery discharge control method provided by an embodiment of the present application. The execution subject of the battery discharge control method provided by the embodiment of the present application can be a battery control system or a server. The embodiment takes the battery control system as the execution subject to describe the battery discharge control method.

[0055] As shown in Figure 2 , the battery discharge control method can include the following steps.

[0056] S101: periodically collecting the working state of the battery during the battery discharge.

[0057] In the embodiment, the collection period of the working state of the battery can be flexibly set by the person skilled in the art according to the actual situation. For example, the collection period can be 10 minutes or 20 minutes, which is not limited herein.

[0058] S102: determining the state change amount between the working state of the battery in the current collection period and the working state of the battery in the previous collection period.

[0059] In one possible implementation, the working state of the battery can include one or more of the temperature, the voltage, the battery cycle number and the battery storage duration. Correspondingly, the above step S102 can include: determining the state change amount between the working state of the battery in the current collection period and the working state of the battery in the previous collection period, the state change amount including one or more of the temperature difference, the voltage difference, the battery cycle number difference and the battery storage duration difference.

[0060] In the embodiment, the application environment temperature of the battery directly affects the impedance value of the battery; and the voltage, the battery cycle number and the battery storage duration of the battery affect the service life of the battery, thereby affecting the impedance value of the battery. Therefore, the state change amount of the battery can be determined by the temperature difference, the voltage difference, the battery cycle number difference or the battery storage duration difference of the battery in adjacent collection periods, so as to subsequently determine whether the actual impedance value of the battery has a large increase according to the state change amount.

[0061] It should be noted that the temperature refers to the temperature of the application environment of the battery. The voltage refers to the voltage during the discharge of the battery. The battery cycle number refers to the number of times of using up the entire battery capacity. The battery storage duration refers to the duration of not using the battery.

[0062] S103: if the state change amount is greater than or equal to a preset threshold, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period. In the embodiment, the person skilled in the art can flexibly set the preset threshold according to the actual situation, which is not limited herein.

[0063] In a possible implementation, the step S103 can include: if any state change amount is greater than or equal to a preset threshold corresponding to the state change amount, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period.

[0064] In the embodiment, as long as any state change amount is greater than or equal to a preset threshold corresponding to the state change amount, it indicates that the working state of the battery changes greatly, which is simple and convenient, and has high efficiency.

[0065] In the embodiment, the state change amount can be one of a temperature difference, a voltage difference, a battery cycle difference and a battery storage time difference, or can be multiple. When the state change amount is one, if the state change amount is greater than or equal to a preset threshold corresponding to the state change amount, the maximum discharge current corresponding to the current collection period can be determined according to the impedance value of the battery in the current collection period. When the state change amount is multiple, as long as any state change amount is greater than or equal to a preset threshold corresponding to the state change amount, the maximum discharge current corresponding to the current collection period can be determined according to the impedance value of the battery in the current collection period, which is simple and convenient, and has high efficiency.

[0066] In another possible implementation, the step S103 can further include: if each state change amount is greater than or equal to a preset threshold corresponding to each state change amount, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period.

[0067] In the embodiment, only when each state change amount is greater than or equal to a preset threshold corresponding to each state change amount, it indicates that the working state of the battery changes greatly. The working state of the battery is determined by comprehensively considering multiple conditions, and the accuracy of the determination of the working state of the battery is improved.

[0068] In yet another possible implementation, the step S103 can further include: determining a weighted state change amount according to each state change amount and a weight corresponding to each state change amount, and if the sum of the weighted state change amounts is greater than or equal to a preset threshold, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period.

[0069] In the embodiment, not only the working state of the battery is determined by comprehensively considering multiple conditions, but also different state change amounts are weighted, and the accuracy of the determination of the working state of the battery is further improved. In the embodiment, the weight corresponding to each state change amount can be flexibly set by those skilled in the art, which is not limited herein.

[0070] In the embodiment, when the state change amount of the battery is greater than or equal to the preset threshold, it indicates that the actual impedance value of the battery increases greatly, and the maximum discharge current of the battery needs to be adjusted in time according to the impedance value of the battery in the current collection period, the discharge current of the battery is limited, the serious polarization reaction of the battery due to the too large discharge current is avoided, the loss voltage in the battery is reduced, and the battery can be normally discharged without triggering the lower limit protection voltage set by the battery control system due to the too large discharge current.

[0071] In the embodiment, the specific manner of determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period is described in detail in Embodiment Two.

[0072] S104: In the current collection period, the battery is discharged by using the maximum discharge current.

[0073] In one possible implementation, after the battery is discharged by using the maximum discharge current in the above step S104, the method can further include: outputting current update prompt information according to the maximum discharge current.

[0074] In the embodiment, after the maximum discharge current is changed, the battery control system can also output the current update prompt information on the display screen of the battery application device to prompt the user that the battery control system is intelligently regulating the discharge current of the battery based on the battery life condition and the application environment, so that the user can take corresponding measures in time.

[0075] In the embodiment, by determining the state change amount between the working state of the battery in the current collection period and the working state in the previous collection period, the impedance value growth of the battery can be periodically determined. Moreover, when the impedance value of the battery grows greatly, the maximum discharge current of the battery can be adjusted according to the impedance value of the battery in the current collection period, the discharge current of the battery is limited, the discharge of the battery due to the too large discharge current is avoided, the lower limit protection voltage set by the battery control system is not triggered, and the battery can be normally discharged.

[0076] The specific content of determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period in step S103 of Embodiment One is described in detail in Embodiment Two.

[0077] Embodiment Two

[0078] Figure 3 is a flowchart of the battery discharge control method provided by an embodiment of the application. The execution subject of the battery discharge control method provided by the embodiment of the application can be a battery control system or a server. The embodiment takes the battery control system as the execution subject to describe the battery discharge control method.

[0079] AsFigure 3 As shown, the battery discharge control method can include the following steps:

[0080] S201: Obtain the voltage value and impedance value of the battery in the current collection period.

[0081] In one possible implementation, the impedance value of the battery in the current collection period can be calculated using the following formula (1):

[0082] DCIR1 = DCIR2 (1 + k) (1)

[0083] Wherein, DCIR1 represents the impedance value of the battery in the current collection period, k represents the impedance growth rate, DCIR2 represents the design impedance value of the battery, DCIR2 = aU1 + bT1 + c, T1 represents the temperature value of the battery in the current collection period, and a, b and c represent coefficients.

[0084] In this embodiment, the impedance value of the battery increases as the use time of the battery increases or the ambient temperature decreases. Therefore, the impedance value of the battery in the current collection period can be determined according to the design impedance value when the battery starts to discharge and the impedance growth rate of the battery in the previous collection period, which is simple and convenient to operate and improves the accuracy of the impedance value of the battery in the current collection period.

[0085] In this embodiment, the impedance growth rate of the battery is equal as the voltage value increases over time or changes with temperature.

[0086] In this embodiment, the design impedance value of the battery refers to the design impedance value when the battery starts to discharge, at which time the impedance value of the battery cannot be obtained in real time. Since the impedance value of the battery is related to the voltage value and temperature value of the battery, the staff can first test the impedance value of the battery at different temperature values and different voltage values, then use linear regression to arrange the linear regression equation DCIR2 = aU1 + bT1 + c between the impedance value and the voltage value and the temperature value, and load this mathematical formula into the battery control system, and finally the battery control system determines the design impedance value of the battery according to the mathematical formula and the voltage value and temperature value of the battery in the current collection period. The coefficients a, b and c can be flexibly set by the person skilled in the art according to the actual situation, which is not limited herein.

[0087] In this embodiment, the linear regression equation DCIR2 = aU1 + bT1 + c between the impedance value and the voltage value and the temperature value can be one mathematical formula, or multiple mathematical formulas divided according to different temperature values, which is not limited herein.

[0088] In one specific embodiment, the impedance values corresponding to different temperature values and voltage values of the battery are collected: a set of initial voltage values U0 and temperature values T are recorded, the battery is controlled to discharge using a fixed current I for 1s, the voltage value U after discharging is recorded, and the impedance value DCIR=(|U-U0|) / I is determined according to the initial voltage value and the voltage value after discharging.

[0089] Through testing, the impedance values corresponding to different temperature values and voltage values of the battery are shown in Table 1 below:

[0090] Table 1

[0091]

[0092] Based on the above data, linear regression is performed, and when the temperature value is between -10℃ and 15℃, the linear regression equation is DCIR2=-19.12U1-3.404T1+209.8; and when the temperature value is between 16℃ and 60℃, the linear regression equation is DCIR2=-3.75U1-0.7027T1+103.86.

[0093] S202: determining the maximum discharge current of the battery according to the voltage value and the impedance value of the battery in the current collection period.

[0094] In one possible embodiment, the above step S202 can include determining the maximum discharge current of the battery using the following formula (2):

[0095]

[0096] wherein I max represents the maximum discharge current, DCIR1 represents the impedance value of the battery in the current collection period, U1 represents the voltage value of the battery in the current collection period, U0 represents the preset lower limit protection voltage value, a represents the preset control margin value, and a>0.

[0097] In this embodiment, the maximum discharge current of the battery is calculated according to the preset lower limit protection voltage value, the preset control margin value, and the impedance value of the battery in the current collection period, so as to avoid triggering the lower limit protection voltage set by the battery control system due to the excessively large discharge current when the battery is discharging, and enable the battery to normally discharge.

[0098] In this embodiment, the skilled person in the art can flexibly set the preset control margin value according to the actual situation, for example, the preset control margin value a=0.2, as long as a>0, which is not limited herein.

[0099] In one possible embodiment, the impedance growth rate k is calculated using the following formula (3):

[0100]

[0101] DCIR3 = aU2 + bT2 + c, U2 represents the voltage value of the battery at the beginning of the previous collection cycle, and T2 represents the temperature value of the battery at the beginning of the previous collection cycle; DCIR4 represents the impedance value of the battery after discharging for a first duration in the previous collection cycle, DCIR4 = (|U3-U2|) / I, U3 represents the voltage value of the battery after discharging for a first duration in the previous collection cycle, and I represents the discharging current of the battery in the previous collection cycle.

[0102] In the embodiment, the impedance growth rate of the battery is determined by the design impedance value of the battery at the beginning of the previous collection cycle and the voltage value of the battery after discharging for a first duration in the previous collection cycle, which is simple and convenient to calculate and has high accuracy.

[0103] In the embodiment, the first duration can be flexibly set by the person skilled in the art according to the actual situation, which is not limited herein.

[0104] The battery discharging control method of the application will be described below with reference to a specific embodiment.

[0105] Embodiment three

[0106] In a specific embodiment, the lithium battery on the mobile phone starts discharging, the battery control system determines the maximum discharging current of the battery according to the working state of the battery, and controls the battery to discharge according to the maximum discharging current:

[0107] Firstly, in the process of discharging the battery, the battery control system collects the ambient temperature of the battery every 20 min, the ambient temperature in the previous collection cycle is 8℃, the voltage at the beginning of discharging is 3.77V, the discharging current is 3600mA, and the voltage after discharging for 1s is 3.30V; the ambient temperature in the current collection cycle is 0℃, the voltage at the beginning of discharging is 3.77V;

[0108] Secondly, the ambient temperature of the battery in the current collection cycle is 0℃, and the ambient temperature of the battery in the previous collection cycle is 8℃, so the state change amount is 8℃;

[0109] Thirdly, since the state change amount 8℃ is greater than the preset threshold 3℃, the maximum discharging current corresponding to the current collection cycle is determined according to the impedance value of the battery in the current collection cycle.

[0110] Fourth step, determine the impedance growth rate of the battery in the previous collection cycle: the ambient temperature of the battery in the previous collection cycle is 8℃, the voltage when starting discharging is 3.77V, the discharging current is 3600mA, and the voltage after discharging for 1s is 3.30V. The calculation formula of the designed impedance value of the battery is DCIR=-19.12U-3.404T+209.8. The designed impedance value of the battery when starting discharging in the previous collection cycle is DCIR3=-19.12U1-3.404T1+209.8=-19.12×3.77-3.404×8+209.8=110.48mΩ. The impedance value of the battery after discharging for the first duration in the previous collection cycle is DCIR4=(|U3-U2|) / I=|3.30-3.77| / 3.6=130.5mΩ. The impedance growth rate k of the battery in the previous collection cycle is (130.5-110.48) / 110.48×100%=18.1%.

[0111] Fifth step, determine the impedance value of the battery in the current collection cycle: the ambient temperature of the battery in the current collection cycle is 0℃, the voltage is 3.77V, and the designed impedance value of the battery is DCIR2=-19.12U1-3.404T1+209.8=-19.12×3.77-3.404×0+209.8=137.7mΩ. The impedance value of the battery in the current collection cycle is DCIR1=DCIR2(1+k)=137.7×(1+18.1%)=162.6mΩ.

[0112] Sixth step, determine the maximum discharging current of the battery: the maximum discharging current I max =(U1-U0-a) / DCIR1=(3.77-3.0-0.2) / 0.1626=3.50A.

[0113] Seventh step, in the current collection cycle, control the battery to discharge according to the maximum discharging current 3.50A.

[0114] Eighth step, the battery control system outputs current update prompt information to the mobile phone to prompt the user that the battery control system is intelligently regulating the discharging current of the battery based on the battery life condition and the application environment, so that the user can take corresponding measures in time.

[0115] Figure 4 The battery discharging control result diagram of an embodiment of the present application is shown in FIG. 1, where the ambient temperature is 0℃, the lower limit protection voltage of the battery is 3.0V, the 3.6A discharging curve refers to the discharging curve when the maximum discharging current is not limited, and the 1.8A discharging curve refers to the discharging curve when the maximum discharging current is limited to 1.8A. Figure 4 Figure 4 ​It can be seen that when the maximum discharge current is not limited, the voltage suddenly drops from 3.77V to 3.18V at the discharge moment (about 1S), which is less than the sum of the lower limit protection voltage 3.0V and the design control margin value 0.2V, i.e. 3.2V, and directly touches the protection voltage in less than 1min (about 12S), which causes the battery to be unable to be normally used. After limiting the maximum discharge current to 1.8A, the voltage suddenly drops from 3.77V to 3.47V, which is greater than the sum of the lower limit protection voltage 3.0V and the design control margin value 0.2V, i.e. 3.2V, and can continue to discharge for about 25min, and the battery is normally discharged.

[0116] Figure 5 The structure diagram of the battery discharge control device of an embodiment of the present application is shown in FIG. 1, which comprises a processor 101 and a memory 102 connected with the processor 101; the memory 102 stores computer execution instructions; the processor 101 executes the computer execution instructions stored in the memory 102 to realize the steps of the battery discharge control method in the above-mentioned method embodiments. Figure 5

[0117] The battery discharge control device can be independent or a part of a battery control system, and the processor 101 and the memory 102 can adopt the existing hardware of the battery control system.

[0118] In the above-mentioned battery discharge control device, the memory 102 and the processor 101 are directly or indirectly electrically connected to realize the transmission or interaction of data. For example, these elements can be electrically connected with each other through one or more communication buses or signal lines, such as bus connection. The memory 102 stores computer execution instructions for realizing the data access control method, including at least one software function module stored in the memory 102 in the form of software or firmware, and the processor 101 executes various function applications and data processing by running the software program and the module stored in the memory 102.

[0119] ​The memory 102 can be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electric Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 102 is configured to store programs. The processor 101 executes the programs after receiving an execution instruction. Further, the software programs and modules in the memory 102 can also include an operating system, which can include various software components and / or drivers for managing system tasks, such as memory management, storage device control, power management, etc., and can communicate with various hardware or software components to provide an operating environment for other software components.

[0120] The processor 101 can be an integrated circuit chip having a processing capability of signals. The processor 101 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc. The processor 101 can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0121] An embodiment of the present application further provides a computer readable storage medium, and the computer readable storage medium stores computer execution instructions. The computer execution instructions are executed by the processor to implement the steps of the method embodiments of the present application.

[0122] An embodiment of the present application further provides a computer program product, and the computer program product includes a computer program. The computer program is executed by the processor to implement the steps of the method embodiments of the present application.

[0123] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the application are indicated by the following claims.

[0124] It is to be understood that the application is not limited to the precise construction herein described and as shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A battery discharge control method characterized by, The method comprises: periodically collecting the working state of the battery during the discharging process of the battery; the working state of the battery comprises one or more of temperature, voltage, battery cycle number and battery storage time length; determining the state change amount between the working state of the battery in the current collection period and the working state of the battery in the previous collection period, specifically comprising: determining the state change amount between the working state of the battery in the current collection period and the working state of the battery in the previous collection period, the state change amount comprising one or more of temperature difference, voltage difference, battery cycle number difference and battery storage time length difference; if the state change amount is greater than or equal to a preset threshold, determining the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period; in the current collection period, controlling the battery to discharge by using the maximum discharge current; the determination of the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period specifically comprises: obtaining the voltage value and impedance value of the battery in the current collection period; determining the maximum discharge current of the battery by using the following formula: Wherein, the represents the maximum discharge current, the represents the impedance value of the battery in the current collection cycle, the represents the voltage value of the battery in the current collection cycle, the represents the preset lower limit protection voltage value, the represents the preset control margin value, ; the impedance value of the battery in the current collection period is calculated by using the following formula: wherein the represents an impedance growth rate, the represents a design impedance value of the battery, , the represents a temperature value of the battery at a current collection period, the , and represent coefficients.

2. The method of claim 1, wherein, the determination of the maximum discharge current corresponding to the current collection period according to the impedance value of the battery in the current collection period specifically comprises: if any state change amount is greater than or equal to the preset threshold corresponding to the state change amount, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period; or, if each state change amount is greater than or equal to the preset threshold corresponding to each state change amount, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period; or, determining the weighted state change amount according to each state change amount and the weight corresponding to each state change amount, if the sum of the weighted state change amounts is greater than or equal to a preset threshold, the maximum discharge current corresponding to the current collection period is determined according to the impedance value of the battery in the current collection period.

3. The method of claim 1, wherein, The impedance growth rate is calculated using the following equation: Wherein, the battery represents the design impedance value of the battery at the beginning of discharging in the previous collection cycle, , the battery represents the voltage value of the battery at the beginning of discharging in the previous collection cycle, the battery represents the temperature value of the battery at the beginning of discharging in the previous collection cycle; the battery represents the impedance value of the battery after discharging for a first duration in the previous collection cycle, , the battery represents the voltage value of the battery after discharging for a first duration in the previous collection cycle, the battery represents the discharging current of the battery in the previous collection cycle.

4. The method of claim 1, wherein, after controlling the battery to discharge by using the maximum discharge current, the method further comprises: outputting current update prompt information according to the maximum discharge current.

5. A battery discharge control device, comprising a processor and a memory connected with the processor in communication; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to realize the method of any one of claims 1-4.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to realize the method of any one of claims 1-4.

7. A computer program product, comprising a computer program, which, when executed by a processor, realizes the method of any one of claims 1-4.

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