Electric bicycle battery power monitoring method and system

Abstract

The present invention discloses a method and system for monitoring the power level of an electric bicycle battery, relates to the field of power batteries, and solves the problem of poor monitoring effect of existing electric bicycle battery power monitoring methods. The method comprises the following steps: step S1: respectively obtaining a cycle charge level deviation and a battery cycle charge capacity deviation to obtain electric vehicle charging monitoring data; step S2: respectively obtaining a cycle discharge level deviation and a battery average discharge rate deviation to obtain electric vehicle discharge monitoring data; and step S3: judging the battery status based on the electric vehicle discharge monitoring data and the electric vehicle charging monitoring data, and issuing an early warning based on the judgment result. The present invention can improve the accuracy of power monitoring results and the safety of electric bicycle batteries.

Description

Technical Field

[0001] The present invention belongs to the field of power batteries and relates to data analysis technology, in particular to a method and system for monitoring the power level of an electric bicycle battery. Background Art

[0002] The existing electric bicycle power monitoring method has the following specific defects:

[0003] 1. Existing electric bicycle power monitoring methods often only monitor a single power data point for power feedback, and are unable to combine multiple different power data points for comprehensive feedback, resulting in inaccurate monitoring results.

[0004] 2. Existing electric bicycle power monitoring methods cannot perform comprehensive battery fault monitoring, and cannot avoid short circuits during driving, thus failing to provide safety protection against personal injury and property loss.

[0005] To this end, we propose a method and system for monitoring the power level of an electric bicycle battery. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide a method and system for monitoring the power of an electric bicycle battery, and the present invention aims to improve the accuracy of the method for monitoring the power of an electric bicycle battery.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: a method for monitoring the power of an electric bicycle battery, comprising the following specific steps:

[0008] Step S1: Obtain a charging monitoring cycle, and divide the charging monitoring cycle into multiple charging monitoring periods. Monitor the actual charging amount in each charging monitoring period to obtain the actual charging amount deviation of the cycle. Monitor the period charging deviation in each charging monitoring period to obtain the battery cycle charging capacity deviation, and obtain the electric vehicle charging monitoring data.

[0009] Step S2: Obtain a discharge monitoring cycle, and divide the discharge monitoring cycle into multiple discharge monitoring periods. Monitor the actual discharge amount in each charge monitoring period to obtain a cycle discharge amount deviation. Perform a correlation analysis between the discharge amount and the discharge power in each charge monitoring period to obtain a battery average discharge rate deviation. The cycle discharge amount deviation and the battery average discharge rate deviation are defined as electric vehicle discharge monitoring data.

[0010] Step S3: Evaluate the battery status based on the electric vehicle discharge monitoring data and the electric vehicle charge monitoring data.

[0011] Furthermore, the step S1 further includes the following specific steps:

[0012] Step S11: marking the time point when the electric bicycle starts charging as a first charging characteristic time point, marking the time point when the electric bicycle completes charging as a second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as a charging monitoring period;

[0013] Step S12: Divide the charging monitoring cycle into a plurality of charging monitoring periods of equal duration, and name the marked charging monitoring periods as the first charging monitoring period to the ath charging monitoring period in chronological order;

[0014] Step S13: performing battery charging monitoring during the first charging monitoring period to obtain an actual charging capacity and a first charging capacity deviation during the first period;

[0015] Step S14: respectively obtaining the charge capacity deviations corresponding to the second charge monitoring period to the ath charge monitoring period, and obtaining the second charge capacity deviation to the ath charge capacity deviation;

[0016] Step S15: Calculate the average of the first charge capacity deviation to the ath charge capacity deviation to obtain the actual charge capacity deviation of the period;

[0017] Step S16: Obtaining battery cycle charging capacity deviation;

[0018] Step S17: defining the cycle actual charging capacity deviation and the battery cycle charging capacity deviation as electric vehicle charging monitoring data.

[0019] A power monitoring system for an electric bicycle battery, comprising:

[0020] Charging data module: used to obtain the actual charging amount deviation of the cycle and the battery cycle charging capacity deviation respectively, and obtain the electric vehicle charging monitoring data;

[0021] Discharge data module: used to obtain the cycle discharge deviation and battery average discharge rate deviation respectively, and obtain electric vehicle discharge monitoring data;

[0022] Power monitoring module: used to evaluate the battery status based on electric vehicle discharge monitoring data and electric vehicle charging monitoring data.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The present invention monitors the power of electric bicycles and trams by comprehensively analyzing the deviation of the actual charging capacity of the cycle, the deviation of the battery cycle charging capacity, the deviation of the cycle discharge capacity and the deviation of the average discharge rate of the battery, thereby ensuring the accuracy of the monitoring results;

[0025] 2. The present invention obtains the power monitoring evaluation coefficient to monitor the fault of the electric bicycle battery and issues a battery capacity warning based on the monitoring results, which can improve the safety of the electric bicycle battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1 It is a diagram of the implementation steps of the present invention;

[0028] Figure 2 is a block diagram of the overall system of the present invention;

[0029] Figure 3 It is a discharge rate deviation line graph of the present invention. DETAILED DESCRIPTION

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 The present invention provides a technical solution: a method for monitoring the power of an electric bicycle battery, comprising the following specific steps:

[0033] Step S1: respectively obtaining the cycle actual charging amount deviation and the battery cycle charging capacity deviation to obtain the electric vehicle charging monitoring data;

[0034] The step S1 further includes the following specific steps:

[0035] Step S11: marking the time point when the electric bicycle starts charging as a first charging characteristic time point, marking the time point when the electric bicycle completes charging as a second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as a charging monitoring period;

[0036] Step S12: Divide the charging monitoring cycle into a plurality of charging monitoring periods of equal duration, and name the marked charging monitoring periods as the first charging monitoring period to the ath charging monitoring period in chronological order;

[0037] Step S13: performing battery charging monitoring during the first charging monitoring period to obtain an actual charging capacity and a first charging capacity deviation during the first period;

[0038] The step S13 further includes the following specific steps:

[0039] Step S131: Obtaining a battery capacity value corresponding to the start time point of the first charging monitoring period to obtain a first battery capacity value; obtaining a battery capacity value corresponding to the end time point of the first charging monitoring period to obtain a second battery capacity value; calculating a difference between the first battery capacity value and the second battery capacity value, and taking an absolute value of the obtained difference to obtain an actual charge capacity corresponding to the first charging monitoring period, and naming the actual charge capacity of the first period;

[0040] Step S132: In the first charging monitoring period, mark a number of charging monitoring time points, obtain the charging power value of the battery corresponding to each charging monitoring time point, obtain multiple charging power values, and average the obtained multiple charging power values ​​to obtain the average charging power of the period;

[0041] Step S133: Obtain the time length of the first charging monitoring period to obtain the charging time length of the period;

[0042] Step S134: Calculating the actual charging capacity, the average charging power, and the charging duration of the first period to obtain a charging capacity deviation for the first charging monitoring period, and naming it the first charging capacity deviation;

[0043] The first charge capacity deviation is calculated using the following formula:

[0044] ;

[0045] Wherein, Cdp1 is the first charge capacity deviation, Sc1 is the actual charge capacity in the first period, Cgl is the average charging power in the period, and Csc is the charging duration in the period;

[0046] Step S14: respectively obtaining the charge capacity deviations corresponding to the second charge monitoring period to the ath charge monitoring period, and obtaining the second charge capacity deviation to the ath charge capacity deviation;

[0047] Step S15: Calculate the average of the first charge capacity deviation to the ath charge capacity deviation to obtain the actual charge capacity deviation of the period;

[0048] Step S16: Obtaining battery cycle charging capacity deviation;

[0049] The step S16 further includes the following specific steps:

[0050] Step S161: acquiring the actual charging capacity of the time periods corresponding to the second charging monitoring time period to the ath charging monitoring time period, and obtaining the actual charging capacity of the second time period to the ath time period;

[0051] Step S162: summing the actual charge capacity from the first period to the actual charge capacity from the ath period to obtain the cumulative charge capacity of the battery cycle;

[0052] Step S163: obtaining the battery capacity of the electric bicycle, calculating the difference between the cumulative charge capacity of the battery cycle and the battery capacity of the electric bicycle, and taking the absolute value of the obtained difference to obtain the battery cycle charge capacity deviation;

[0053] Step S17: defining the cycle actual charging capacity deviation and the battery cycle charging capacity deviation as electric vehicle charging monitoring data;

[0054] Step S2: respectively obtaining the cycle discharge amount deviation and the battery average discharge rate deviation to obtain the electric vehicle discharge monitoring data;

[0055] The step S2 further includes the following specific steps:

[0056] Step S21: marking the time point when the electric bicycle drive motor is started as a first discharge characteristic time point, marking the time point when the electric bicycle drive motor is turned off as a second discharge characteristic time point, obtaining the interval between the first discharge characteristic time point and the second discharge characteristic time point to obtain a characteristic discharge duration, obtaining a reference characteristic discharge duration, and when the characteristic discharge duration is greater than or equal to the reference characteristic discharge duration, marking the period between the first discharge characteristic time point and the second discharge characteristic time point as a discharge monitoring period;

[0057] Step S22: dividing the discharge monitoring cycle into a plurality of discharge monitoring time periods of equal duration, and naming the marked plurality of discharge monitoring time periods as the first discharge monitoring time period to the bth discharge monitoring time period in chronological order;

[0058] Step S23: performing battery discharge monitoring in the first discharge monitoring period to obtain the discharge power, the first discharge capacity deviation, and the actual discharge capacity in the first period;

[0059] The step S23 further includes the following specific steps:

[0060] Step S231: obtaining a battery capacity value corresponding to the start time point of the first discharge monitoring period to obtain a first battery capacity value; obtaining a battery capacity value corresponding to the end time point of the first discharge monitoring period to obtain a second battery capacity value; calculating the difference between the first battery capacity value and the second battery capacity value, and taking the absolute value of the obtained difference to obtain an actual discharge capacity corresponding to the first discharge monitoring period, and naming the actual discharge capacity of the first period;

[0061] Step S232: In the first discharge monitoring period, mark several discharge monitoring time points, obtain the discharge power value of the battery corresponding to each discharge monitoring time point, obtain multiple discharge power values, and average the obtained multiple discharge power values ​​to obtain the period average discharge power. The obtained period average discharge power is named the first period discharge power.

[0062] Step S233: Acquire the time length of the first discharge monitoring period to obtain the discharge duration of the period;

[0063] Step S234: Calculating the actual discharge amount, the average discharge power, and the discharge duration of the first period to obtain a discharge amount deviation for the first discharge monitoring period, and naming it the first discharge amount deviation;

[0064] The first discharge amount deviation is calculated using the following formula:

[0065] ;

[0066] Wherein, Fdp1 is the first discharge capacity deviation, Fc1 is the actual discharge capacity in the first period, Fgl is the average discharge power in the period, and Fsc is the discharge duration in the period;

[0067] Step S24: respectively obtaining discharge amount deviations corresponding to the second discharge monitoring period to the bth discharge monitoring period to obtain the second discharge amount deviation to the bth discharge amount deviation;

[0068] Step S25: Calculating the average of the first discharge amount deviation to the bth discharge amount deviation to obtain a period discharge amount deviation;

[0069] Step S26: acquiring the discharge powers corresponding to the second discharge monitoring period to the bth discharge monitoring period respectively, and obtaining the discharge powers from the second period to the bth period;

[0070] Step S27: acquiring the actual discharge amounts corresponding to the second discharge monitoring period to the bth discharge monitoring period respectively, and obtaining the actual discharge amounts from the second period to the bth period;

[0071] Step S28: Obtaining the average discharge rate deviation of the battery corresponding to the discharge monitoring period;

[0072] The step S28 further includes the following specific steps:

[0073] Step S281: In a plane rectangular coordinate system, the discharge power from the first period to the bth period is marked as the horizontal axis, and the actual discharge amount from the first period to the bth period is marked as the vertical axis;

[0074] Step S282: Mark the coordinate point corresponding to the discharge power in the first period as the first coordinate point, mark the coordinate point corresponding to the discharge power in the second period as the second coordinate point, and so on, mark the coordinate point corresponding to the discharge power in the bth period as the bth coordinate point;

[0075] Step S283: Name the line connecting the first coordinate point and the second coordinate point as the first coordinate line, name the line connecting the second coordinate point and the third coordinate point as the second coordinate line, and so on, name the line connecting the b-1th coordinate point and the bth coordinate point as the b-1th coordinate line, to obtain a discharge rate line graph;

[0076] Step S284: In the discharge rate line graph, the slopes of the line connecting the first coordinate to the b-1th coordinate are respectively obtained to obtain multiple line slopes, and the average of the obtained multiple line slopes is calculated to obtain the average discharge rate of the battery;

[0077] Step S285: obtaining the battery average discharge reference rate, calculating the difference between the battery average discharge rate and the battery average discharge reference rate, and taking the absolute value of the obtained difference to obtain the battery average discharge rate deviation;

[0078] Step S29: defining the cycle discharge amount deviation and the battery average discharge rate deviation as electric vehicle discharge monitoring data;

[0079] Step S3: performing battery status evaluation based on the electric vehicle discharge monitoring data and the electric vehicle charging monitoring data;

[0080] The step S3 further includes the following specific steps:

[0081] Step S31: Acquire the electric vehicle charging monitoring data, and acquire the cycle actual charging capacity deviation and the battery cycle charging capacity deviation according to the electric vehicle charging monitoring data;

[0082] Step S32: obtaining the electric vehicle discharge monitoring data, and obtaining the cycle discharge amount deviation and the battery average discharge rate deviation according to the electric vehicle discharge monitoring data;

[0083] Step S33: Calculating the actual charge capacity deviation of the cycle, the battery cycle charge capacity deviation, the cycle discharge capacity deviation, and the battery average discharge rate deviation to obtain a power monitoring evaluation coefficient;

[0084] The power monitoring evaluation coefficient is calculated as follows:

[0085] ;

[0086] Where Dlp is the power monitoring evaluation coefficient, Cdp is the actual charge capacity deviation of the cycle, Fdp is the cycle discharge capacity deviation, Rlp is the battery cycle charge capacity deviation, and Fds is the battery average discharge rate deviation;

[0087] Step S34: obtaining a power monitoring assessment coefficient threshold, comparing the power monitoring assessment coefficient with the power monitoring assessment coefficient threshold, and issuing a battery capacity warning based on the comparison result;

[0088] The step S34 further includes the following specific steps:

[0089] Step S341: respectively obtaining a cycle actual charge capacity deviation threshold, a battery cycle charge capacity deviation threshold, a cycle discharge capacity deviation threshold, and a battery average discharge rate deviation threshold;

[0090] Step S342: Calculating the actual charge capacity deviation threshold, the battery cycle charge capacity deviation threshold, the cycle discharge capacity deviation threshold, and the battery average discharge rate deviation threshold to obtain a power monitoring evaluation coefficient threshold;

[0091] The power monitoring evaluation coefficient threshold is calculated using the following formula:

[0092] ;

[0093] Among them, Dlpy is the power monitoring evaluation coefficient threshold, Cdpy is the cycle actual charge capacity deviation threshold, Fdpy is the cycle discharge capacity deviation threshold, Rlpy is the battery cycle charge capacity deviation threshold, and Fdsy is the battery average discharge rate deviation threshold;

[0094] Step S343: If the power monitoring evaluation coefficient is greater than or equal to the power monitoring evaluation coefficient threshold, it is determined that there is a fault in the electric bicycle battery and an early warning is issued;

[0095] Step S344: If the power monitoring evaluation coefficient is less than the power monitoring evaluation coefficient threshold, it is determined that there is no fault in the electric bicycle battery, and no warning is issued.

[0096] In this application, if a corresponding calculation formula appears, the above calculation formula is dimensionless and its numerical calculation is performed. The weight coefficient, proportional coefficient and other coefficients in the formula are set to a result value obtained by quantifying each parameter. Regarding the size of the weight coefficient and the proportional coefficient, as long as it does not affect the proportional relationship between the parameter and the result value, it is acceptable.

[0097] Example 2

[0098] See also Figure 2Based on another concept of the same invention, a power monitoring system for an electric bicycle battery is proposed, comprising a charging data module, a discharging data module, a power monitoring module, and a server. The charging data module, the discharging data module, and the power monitoring module are respectively connected to the server, and the server controls the charging data module, the discharging data module, and the power monitoring module respectively.

[0099] The charging data module obtains the actual charging amount deviation of the cycle and the battery cycle charging capacity deviation respectively to obtain the electric vehicle charging monitoring data;

[0100] The details are as follows:

[0101] Marking the time point when the electric bicycle starts charging as a first charging characteristic time point, marking the time point when the electric bicycle completes charging as a second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as a charging monitoring period;

[0102] It should be noted here that:

[0103] The charging monitoring cycle involved here is a complete charging cycle of the electric bicycle, that is, the battery of the electric bicycle is fully charged at the second characteristic charging time point;

[0104] Divide the charging monitoring cycle into a number of charging monitoring periods of equal time, and name the marked multiple charging monitoring periods as the first charging monitoring period to the ath charging monitoring period in chronological order;

[0105] It should be noted here that:

[0106] In this application, a referred to herein is a numerical value corresponding to a charging monitoring period, and a is an integer greater than 0;

[0107] Performing battery charging monitoring during a first charging monitoring period to obtain an actual charging capacity during the first period and a first charging capacity deviation;

[0108] The details are as follows:

[0109] Obtaining a battery capacity value corresponding to a start time point of a first charging monitoring period to obtain a first battery capacity value; obtaining a battery capacity value corresponding to an end time point of the first charging monitoring period to obtain a second battery capacity value; calculating a difference between the first battery capacity value and the second battery capacity value, and taking an absolute value of the obtained difference to obtain an actual charge capacity of the period corresponding to the first charging monitoring period, and naming the actual charge capacity of the period as the first actual charge capacity;

[0110] In a first charging monitoring period, several charging monitoring time points are marked, and the charging power value corresponding to each charging monitoring time point is obtained to obtain multiple charging power values. The obtained multiple charging power values ​​are averaged to obtain an average charging power for the period;

[0111] Obtaining the duration of the first charging monitoring period to obtain the charging duration of the period;

[0112] The actual charging capacity of the first period, the average charging power of the period, and the charging time of the period are calculated to obtain the charging capacity deviation of the first charging monitoring period, and the first charging capacity deviation is named;

[0113] The first charge capacity deviation is calculated using the following formula:

[0114] ;

[0115] Wherein, Cdp1 is the first charge capacity deviation, Sc1 is the actual charge capacity in the first period, Cgl is the average charging power in the period, and Csc is the charging duration in the period;

[0116] Repeat the process of obtaining the first charge capacity deviation, respectively obtain the charge capacity deviations corresponding to the second charge monitoring period to the ath charge monitoring period, and obtain the second charge capacity deviation to the ath charge capacity deviation;

[0117] Calculate the average of the first charge capacity deviation to the ath charge capacity deviation to obtain the actual charge capacity deviation of the period;

[0118] Repeat the process of obtaining the actual charge capacity of the first time period, and obtain the actual charge capacity of the time periods corresponding to the second charging monitoring time period to the a-th charging monitoring time period, to obtain the actual charge capacity of the second time period to the a-th time period;

[0119] Sum the actual charging capacity from the first period to the actual charging capacity of the ath period to obtain the cumulative charging capacity of the battery cycle;

[0120] Obtain the battery capacity of the electric bicycle, calculate the difference between the cumulative charge capacity of the battery cycle and the battery capacity of the electric bicycle, and take the absolute value of the obtained difference to obtain the battery cycle charge capacity deviation;

[0121] The deviation of the actual charging amount of the cycle and the deviation of the battery cycle charging capacity are defined as the electric vehicle charging monitoring data;

[0122] The charging data module acquires the electric vehicle charging monitoring data and transmits it to the power monitoring module;

[0123] The discharge data module obtains the cycle discharge deviation and the battery average discharge rate deviation respectively to obtain the electric vehicle discharge monitoring data;

[0124] Marking the time point when the electric bicycle drive motor is started as the first discharge characteristic time point, marking the time point when the electric bicycle drive motor is turned off as the second discharge characteristic time point, obtaining the interval between the first discharge characteristic time point and the second discharge characteristic time point to obtain a characteristic discharge duration, obtaining a benchmark characteristic discharge duration, and when the characteristic discharge duration is greater than or equal to the benchmark characteristic discharge duration, marking the period between the first discharge characteristic time point and the second discharge characteristic time point as a discharge monitoring period;

[0125] It should be noted here that:

[0126] The discharge monitoring cycle involved here is the discharge monitoring cycle with the shortest time interval with the charge monitoring cycle;

[0127] Divide the discharge monitoring period into a number of discharge monitoring periods of equal time, and name the marked multiple discharge monitoring periods as the first discharge monitoring period to the bth discharge monitoring period in chronological order;

[0128] It should be noted here that:

[0129] In this application, b referred to herein is a numerical value corresponding to the discharge monitoring period, and b is an integer greater than 0;

[0130] Performing battery discharge monitoring in a first discharge monitoring period to obtain a discharge power in the first period, a first discharge amount deviation, and an actual discharge amount in the first period;

[0131] The details are as follows:

[0132] Obtaining a battery capacity value corresponding to a start time point of a first discharge monitoring period, obtaining a first battery capacity value; obtaining a battery capacity value corresponding to an end time point of the first discharge monitoring period, obtaining a second battery capacity value; calculating a difference between the first battery capacity value and the second battery capacity value, and taking an absolute value of the obtained difference to obtain an actual discharge capacity of the period corresponding to the first discharge monitoring period, and naming the actual discharge capacity of the period as the first actual discharge capacity;

[0133] In a first discharge monitoring period, several discharge monitoring time points are marked, and the discharge power value corresponding to each discharge monitoring time point is obtained to obtain multiple discharge power values. The multiple discharge power values ​​obtained are averaged to obtain the period average discharge power, and the obtained period average discharge power is named the first period discharge power.

[0134] Acquire the time length of the first discharge monitoring period to obtain the discharge duration of the period;

[0135] The actual discharge amount, average discharge power and discharge duration of the first period are calculated to obtain the discharge amount deviation of the first discharge monitoring period, which is named the first discharge amount deviation;

[0136] The first discharge amount deviation is calculated using the following formula:

[0137] ;

[0138] Wherein, Fdp1 is the first discharge capacity deviation, Fc1 is the actual discharge capacity in the first period, Fgl is the average discharge power in the period, and Fsc is the discharge duration in the period;

[0139] Repeat the process of obtaining the first discharge amount deviation, respectively obtain the discharge amount deviations corresponding to the second discharge monitoring period to the bth discharge monitoring period, and obtain the second discharge amount deviation to the bth discharge amount deviation;

[0140] Calculate the average of the first discharge amount deviation to the bth discharge amount deviation to obtain the period discharge amount deviation;

[0141] Repeat the process of obtaining the discharge power of the first time period, and obtain the discharge power of the time periods corresponding to the second discharge monitoring time period to the bth discharge monitoring time period, to obtain the discharge power of the second time period to the bth time period;

[0142] Repeat the process of obtaining the actual discharge amount in the first time period, and obtain the actual discharge amount in the time periods corresponding to the second discharge monitoring time period to the bth discharge monitoring time period, to obtain the actual discharge amount in the second time period to the bth time period;

[0143] Obtain the average battery discharge rate deviation corresponding to the discharge monitoring period;

[0144] The details are as follows:

[0145] In the existing plane rectangular coordinate system, the discharge power from the first period to the bth period is marked as the horizontal axis, and the actual discharge amount from the first period to the bth period is marked as the vertical axis;

[0146] Mark the coordinate point corresponding to the discharge power in the first period as the first coordinate point, mark the coordinate point corresponding to the discharge power in the second period as the second coordinate point, and so on, mark the coordinate point corresponding to the discharge power in the bth period as the bth coordinate point;

[0147] See also Figure 3 , name the line connecting the first coordinate point and the second coordinate point as the first coordinate line, name the line connecting the second coordinate point and the third coordinate point as the second coordinate line, and so on, name the line connecting the b-1th coordinate point and the bth coordinate point as the b-1th coordinate line, and obtain the discharge rate line graph;

[0148] In the discharge rate broken line graph, the slopes of the line connecting the first coordinate to the b-1th coordinate are obtained respectively to obtain multiple line slopes, and the average of the obtained multiple line slopes is calculated to obtain the average discharge rate of the battery;

[0149] Obtaining an average discharge reference rate of the battery, calculating the difference between the average discharge rate of the battery and the average discharge reference rate of the battery, and taking the absolute value of the obtained difference to obtain the average discharge rate deviation of the battery;

[0150] The cycle discharge deviation and battery average discharge rate deviation are defined as electric vehicle discharge monitoring data;

[0151] The power monitoring module evaluates the battery status based on the electric vehicle discharge monitoring data and the electric vehicle charging monitoring data;

[0152] The details are as follows:

[0153] Obtaining electric vehicle charging monitoring data, and obtaining cycle actual charging capacity deviation and battery cycle charging capacity deviation based on the electric vehicle charging monitoring data;

[0154] Obtaining electric vehicle discharge monitoring data, and obtaining cycle discharge amount deviation and battery average discharge rate deviation based on the electric vehicle discharge monitoring data;

[0155] The power monitoring evaluation coefficient is obtained by calculating the actual charge capacity deviation of the cycle, the battery cycle charge capacity deviation, the cycle discharge capacity deviation and the battery average discharge rate deviation;

[0156] The power monitoring evaluation coefficient is calculated as follows:

[0157] ;

[0158] Where Dlp is the power monitoring evaluation coefficient, Cdp is the actual charge capacity deviation of the cycle, Fdp is the cycle discharge capacity deviation, Rlp is the battery cycle charge capacity deviation, and Fds is the battery average discharge rate deviation;

[0159] Obtaining a power monitoring assessment coefficient threshold, performing a numerical comparison between the power monitoring assessment coefficient and the power monitoring assessment coefficient threshold, and issuing a battery capacity warning based on the numerical comparison result;

[0160] The details are as follows:

[0161] Obtain the cycle actual charge capacity deviation threshold, battery cycle charge capacity deviation threshold, cycle discharge capacity deviation threshold, and battery average discharge rate deviation threshold respectively;

[0162] It should be noted here that:

[0163] The cycle actual charge capacity deviation threshold, battery cycle charge capacity deviation threshold, cycle discharge capacity deviation threshold and battery average discharge rate deviation threshold involved here are respectively the maximum cycle actual charge capacity deviation, maximum battery cycle charge capacity deviation, maximum cycle discharge capacity deviation and maximum battery average discharge rate deviation corresponding to the electric bicycle battery without faults;

[0164] The power monitoring evaluation coefficient threshold is obtained by calculating the cycle actual charge capacity deviation threshold, the battery cycle charge capacity deviation threshold, the cycle discharge capacity deviation threshold and the battery average discharge rate deviation threshold;

[0165] It should be noted here that:

[0166] The calculation of the power monitoring evaluation coefficient threshold involved here is as follows:

[0167] ;

[0168] Among them, Dlpy is the power monitoring evaluation coefficient threshold, Cdpy is the cycle actual charge capacity deviation threshold, Fdpy is the cycle discharge capacity deviation threshold, Rlpy is the battery cycle charge capacity deviation threshold, and Fdsy is the battery average discharge rate deviation threshold;

[0169] The numerical comparison process is as follows:

[0170] If the power monitoring evaluation coefficient is greater than or equal to the power monitoring evaluation coefficient threshold, it is determined that the electric bicycle battery has a fault and an early warning is issued;

[0171] If the power monitoring evaluation coefficient is less than the power monitoring evaluation coefficient threshold, it is determined that there is no fault in the electric bicycle battery and no warning is issued.

[0172] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for monitoring the power of an electric bicycle battery, characterized in that: include: Step S1: Obtain a charging monitoring cycle, and divide the charging monitoring cycle into multiple charging monitoring periods. Monitor the charging amount in each charging monitoring period to obtain the actual charging amount deviation of the cycle. Monitor the charging amount deviation in each charging monitoring period to obtain the battery cycle charging capacity deviation, and obtain the electric vehicle charging monitoring data. Step S2: Obtain a discharge monitoring cycle, and divide the discharge monitoring cycle into multiple discharge monitoring periods. Monitor the discharge amount in each charge monitoring period to obtain a cycle discharge amount deviation. Perform a correlation analysis between the discharge amount and the discharge power in each charge monitoring period to obtain a battery average discharge rate deviation. The cycle discharge amount deviation and the battery average discharge rate deviation are defined as electric vehicle discharge monitoring data. Step S3: performing battery status evaluation based on the electric vehicle discharge monitoring data and the electric vehicle charging monitoring data; The step S2 further includes the following specific steps: Step S21: marking the time point when the electric bicycle drive motor is started as a first discharge characteristic time point, marking the time point when the electric bicycle drive motor is turned off as a second discharge characteristic time point, obtaining the interval between the first discharge characteristic time point and the second discharge characteristic time point to obtain a characteristic discharge duration, obtaining a reference characteristic discharge duration, and if the characteristic discharge duration is greater than or equal to the reference characteristic discharge duration, marking the period between the first discharge characteristic time point and the second discharge characteristic time point as a discharge monitoring period; Step S22: dividing the discharge monitoring cycle into a plurality of discharge monitoring time periods of equal duration, and naming the marked plurality of discharge monitoring time periods as the first discharge monitoring time period to the bth discharge monitoring time period in chronological order; Step S23: performing battery discharge monitoring in the first discharge monitoring period to obtain the discharge power, the first discharge capacity deviation, and the actual discharge capacity in the first period; Step S24: respectively obtaining discharge amount deviations corresponding to the second discharge monitoring period to the bth discharge monitoring period to obtain the second discharge amount deviation to the bth discharge amount deviation; Step S25: Calculating the average of the first discharge amount deviation to the bth discharge amount deviation to obtain a period discharge amount deviation; Step S26: acquiring the discharge powers corresponding to the second discharge monitoring period to the bth discharge monitoring period respectively, and obtaining the discharge powers from the second period to the bth period; Step S27: acquiring the actual discharge amounts corresponding to the second discharge monitoring period to the bth discharge monitoring period respectively, and obtaining the actual discharge amounts from the second period to the bth period; Step S28: Obtaining the average discharge rate deviation of the battery corresponding to the discharge monitoring period; The step S28 further includes the following specific steps: Step S281: In a plane rectangular coordinate system, the discharge power from the first period to the bth period is marked as the horizontal axis, and the actual discharge amount from the first period to the bth period is marked as the vertical axis; Step S282: Mark the coordinate point corresponding to the discharge power in the first period as the first coordinate point, mark the coordinate point corresponding to the discharge power in the second period as the second coordinate point, and so on, mark the coordinate point corresponding to the discharge power in the bth period as the bth coordinate point; Step S283: Name the line connecting the first coordinate point and the second coordinate point as the first coordinate line, name the line connecting the second coordinate point and the third coordinate point as the second coordinate line, and so on, name the line connecting the b-1th coordinate point and the bth coordinate point as the b-1th coordinate line, to obtain a discharge rate line graph; Step S284: In the discharge rate line graph, the slopes of the line connecting the first coordinate to the b-1th coordinate are respectively obtained to obtain multiple line slopes, and the average of the obtained multiple line slopes is calculated to obtain the average discharge rate of the battery; Step S285: obtaining the battery average discharge reference rate, calculating the difference between the battery average discharge rate and the battery average discharge reference rate, and taking the absolute value of the obtained difference to obtain the battery average discharge rate deviation.

2. The method for monitoring the power of an electric bicycle battery according to claim 1, characterized in that: The step S1 further includes the following specific steps: Step S11: marking the time point when the electric bicycle starts charging as a first charging characteristic time point, marking the time point when the electric bicycle completes charging as a second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as a charging monitoring period; Step S12: Divide the charging monitoring cycle into a plurality of charging monitoring time periods of equal duration, and name the marked plurality of charging monitoring time periods as the first charging monitoring time period to the ath charging monitoring time period in chronological order.

3. The method for monitoring the power of an electric bicycle battery according to claim 2, characterized in that: The step S1 further includes the following specific steps: Step S13: performing battery charging monitoring during the first charging monitoring period to obtain an actual charging capacity and a first charging capacity deviation during the first period; Step S14: respectively obtaining the charge capacity deviations corresponding to the second charge monitoring period to the ath charge monitoring period, and obtaining the second charge capacity deviation to the ath charge capacity deviation; Step S15: Calculate the average of the first charge capacity deviation to the ath charge capacity deviation to obtain the period actual charge capacity deviation.

4. The method for monitoring the electric quantity of an electric bicycle battery according to claim 3, characterized in that: The step S1 further includes the following specific steps: Step S16: Obtaining battery cycle charging capacity deviation; Step S17: defining the cycle actual charging capacity deviation and the battery cycle charging capacity deviation as electric vehicle charging monitoring data.

5. The method for monitoring the power of an electric bicycle battery according to claim 4, characterized in that: The step S13 further includes the following specific steps: Step S131: Obtain the battery capacity value corresponding to the start time point of the first charging monitoring period to obtain the first battery capacity value, obtain the battery capacity value corresponding to the end time point of the first charging monitoring period to obtain the second battery capacity value, calculate the difference between the first battery capacity value and the second battery capacity value, and take the absolute value of the obtained difference to obtain the actual charging capacity of the period corresponding to the first charging monitoring period, and name it the actual charging capacity of the first period.

6. The method for monitoring the power level of an electric bicycle battery according to claim 5, characterized in that: The step S13 further includes the following specific steps: Step S132: In the first charging monitoring period, marking a plurality of charging monitoring time points, obtaining a charging power value corresponding to each charging monitoring time point, obtaining a plurality of charging power values, and averaging the obtained plurality of charging power values ​​to obtain an average charging power for the period; Step S133: Obtain the time length of the first charging monitoring period to obtain the charging time length of the period; Step S134: Calculating the actual charging capacity, the average charging power, and the charging duration of the first period to obtain a charging capacity deviation for the first charging monitoring period, and naming it the first charging capacity deviation; A first charge amount deviation is calculated.

7. The method for monitoring the power level of an electric bicycle battery according to claim 6, characterized in that: The step S16 further includes the following specific steps: Step S161: acquiring the actual charging capacity of the time periods corresponding to the second charging monitoring time period to the ath charging monitoring time period, and obtaining the actual charging capacity of the second time period to the ath time period; Step S162: summing the actual charge capacity from the first period to the actual charge capacity from the ath period to obtain the cumulative charge capacity of the battery cycle; Step S163: obtaining the battery capacity of the electric bicycle, calculating the difference between the cumulative charge capacity of the battery cycle and the battery capacity of the electric bicycle, and taking the absolute value of the obtained difference to obtain the battery cycle charge capacity deviation.

8. The method for monitoring the power level of an electric bicycle battery according to claim 1, wherein: The step S3 further includes the following specific steps: Step S31: Acquire the electric vehicle charging monitoring data, and acquire the cycle actual charging capacity deviation and the battery cycle charging capacity deviation according to the electric vehicle charging monitoring data; Step S32: obtaining the electric vehicle discharge monitoring data, and obtaining the cycle discharge amount deviation and the battery average discharge rate deviation according to the electric vehicle discharge monitoring data; Step S33: Calculating the actual charge capacity deviation of the cycle, the battery cycle charge capacity deviation, the cycle discharge capacity deviation, and the battery average discharge rate deviation to obtain a power monitoring evaluation coefficient; Calculate the power monitoring evaluation coefficient; Step S34: obtaining a power monitoring assessment coefficient threshold, performing a numerical comparison between the power monitoring assessment coefficient and the power monitoring assessment coefficient threshold, and issuing a battery capacity warning based on the numerical comparison result.

9. An electric bicycle battery power monitoring system, applicable to an electric bicycle battery power monitoring method according to any one of claims 1 to 8, characterized in that: The power monitoring system includes: Charging data module: used to obtain the actual charging amount deviation of the cycle and the battery cycle charging capacity deviation respectively, and obtain the electric vehicle charging monitoring data; Discharge data module: used to obtain the cycle discharge deviation and battery average discharge rate deviation respectively, and obtain electric vehicle discharge monitoring data; Power monitoring module: used to evaluate the battery status based on electric vehicle discharge monitoring data and electric vehicle charging monitoring data.

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