Electric quantity monitoring method and system for battery of electric bicycle

Abstract

The invention discloses an electric quantity monitoring method and system for an electric bicycle battery, relates to the field of power batteries, and solves the problem of poor monitoring effect of the existing electric bicycle battery electric quantity monitoring method, and the method comprises the following steps: S1, respectively obtaining periodic charging quantity deviation and battery periodic charging capacity deviation to obtain electric bicycle charging monitoring data, s2, respectively acquiring a periodic discharge capacity deviation and a battery average discharge rate deviation to obtain electric vehicle discharge monitoring data, and S3, performing battery state judgment according to the electric vehicle discharge monitoring data and the electric vehicle charge monitoring data, and issuing an early warning according to a judgment result. The accuracy of the electric quantity monitoring result and the use safety of the battery of the electric bicycle can be improved.

Description

Technical Field

[0001] The 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 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 for power feedback, and cannot combine multiple different power data for comprehensive feedback, resulting in a lack of accuracy in the monitoring results;

[0004] 2. The existing electric bicycle power monitoring method cannot perform comprehensive fault monitoring of the battery, and cannot avoid short circuits during driving of the electric bicycle, 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 battery capacity of an electric bicycle. Summary of the invention

[0006] In view of the deficiencies in 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 obtain the charging monitoring cycle into multiple charging monitoring time periods, obtain the actual charging amount deviation of the cycle by monitoring the actual charging amount in each charging monitoring time period, and obtain the battery cycle charging capacity deviation by monitoring the charging deviation of each charging monitoring time period, and obtain the electric vehicle charging monitoring data;

[0009] Step S2: Obtain a discharge monitoring cycle, and obtain the discharge monitoring cycle into multiple discharge monitoring periods, obtain the cycle discharge amount deviation by monitoring the actual discharge amount in each charging monitoring period, and obtain the battery average discharge rate deviation by performing a correlation analysis between the discharge amount and the discharge power in each charging monitoring period, and define the cycle discharge amount deviation and the battery average discharge rate deviation as electric vehicle discharge monitoring data;

[0010] Step S3: Evaluate the battery status according to 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 the first charging characteristic time point, marking the time point when the electric bicycle completes charging as the second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as the charging monitoring cycle;

[0013] Step S12: dividing the charging monitoring cycle into a plurality of charging monitoring time periods of equal duration, and naming 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;

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

[0015] Step S14: respectively acquiring 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 cycle actual charge capacity deviation;

[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 capacity 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 the electric vehicle discharge monitoring data;

[0022] Power monitoring module: used to evaluate the battery status based on the electric vehicle discharge monitoring data and the 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, so as to ensure the accuracy of the monitoring results;

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

[0026] In order 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 the overall system block diagram of the present invention;

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

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

[0031] Embodiment 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 the first charging characteristic time point, marking the time point when the electric bicycle completes charging as the second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as the charging monitoring cycle;

[0036] Step S12: dividing the charging monitoring cycle into a plurality of charging monitoring time periods of equal duration, and naming 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;

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

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

[0039] Step S131: obtaining a battery capacity value corresponding to a start time point of the first charging monitoring period, obtaining a first battery capacity value; obtaining a battery capacity value corresponding to an end time point of the first charging 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, obtaining an actual charge capacity of the period corresponding to the first charging monitoring period, and naming it as the first period actual charge capacity;

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

[0041] Step S133: Acquire 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 of the first time period, the average charging power of the time period, and the charging duration of the time period to obtain the charging capacity deviation of the first charging monitoring time period, and naming it the first charging capacity deviation;

[0043] The first charge amount deviation is calculated, and the specific formula is as follows:

[0044] Cdp1= | Sc1-(Cgl×Csc) | ;

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

[0046] Step S14: respectively acquiring 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 cycle actual charge capacity deviation;

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

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

[0050] Step S161: respectively 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 charging capacity from the first period to the ath period to obtain the cumulative charging 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 driving motor is started as the first discharge characteristic time point, marking the time point when the electric bicycle driving motor is turned off as the second discharge characteristic time point, acquiring the interval between the first discharge characteristic time point and the second discharge characteristic time point to obtain the characteristic discharge time, and obtaining the reference characteristic discharge time. When the characteristic discharge time is greater than or equal to the reference characteristic discharge time, marking the period between the first discharge characteristic time point and the second discharge characteristic time point as the 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 in the first period, the first discharge amount deviation and the actual discharge amount in the first period;

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

[0060] Step S231: obtaining a battery capacity value corresponding to a start time point of the 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, obtaining an actual discharge amount of the period corresponding to the first discharge monitoring period, and naming it as the first period actual discharge amount;

[0061] Step S232: In the first discharge monitoring period, mark a number of discharge monitoring time points, respectively obtain the discharge power value corresponding to each discharge monitoring time point of the battery, obtain multiple discharge power values, and average the obtained multiple discharge power values ​​to obtain the period average discharge power, and name the obtained period average discharge power as the first period discharge power;

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

[0063] Step S234: calculating the actual discharge amount in the first time period, the average discharge power in the time period, and the discharge duration in the time period to obtain the discharge amount deviation in the first discharge monitoring time period, and naming it the first discharge amount deviation;

[0064] The first discharge amount deviation is calculated, and the specific formula is as follows:

[0065] Fdp1 = |Fc1 - (Fgl × Fsc)|;

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

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

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

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

[0070] Step S27: respectively acquiring the actual discharge amounts corresponding to the second discharge monitoring period to the bth discharge monitoring period, 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 coordinate, and the actual discharge amount from the first period to the bth period is marked as the vertical coordinate;

[0074] Step S282: marking the coordinate point corresponding to the discharge power in the first period as the first coordinate point, marking the coordinate point corresponding to the discharge power in the second period as the second coordinate point, and so on, marking 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, and obtain a discharge rate line graph;

[0076] Step S284: in the discharge rate line graph, respectively obtain the slopes of the first coordinate line to the b-1th coordinate line to obtain a plurality of line slopes, and average the obtained plurality of line slopes to obtain the average discharge rate of the battery;

[0077] Step S285: obtaining the 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;

[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: evaluating the battery status according to 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: Calculate 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, and the specific formula is as follows:

[0085]

[0086] Wherein, D lp is the power monitoring evaluation coefficient, Cdp is the actual charge capacity deviation of the cycle, Fdp is the cycle discharge capacity deviation, R lp 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 according to 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: Calculate 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, and the specific formula is as follows:

[0092]

[0093] Wherein, D l py is the power monitoring evaluation coefficient threshold, Cdpy is the cycle actual charge capacity deviation threshold, Fdpy is the cycle discharge capacity deviation threshold, R l py 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 the electric bicycle battery has a fault 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 corresponding calculation formulas appear, the above calculation formulas are all dimensionless and take their numerical calculations. The weight coefficients, proportional coefficients and other coefficients in the formulas are set to a result value obtained by quantifying each parameter. The size of the weight coefficient and the proportional coefficient can be determined as long as it does not affect the proportional relationship between the parameter and the result value.

[0097] Embodiment 2

[0098] See also Figure 2 Based on another concept of the same invention, a power monitoring system for an electric bicycle battery is now proposed, comprising a charging data module, a discharging data module, a power monitoring module and a server, wherein 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] Mark the time point when the electric bicycle starts charging as the first charging characteristic time point, mark the time point when the electric bicycle completes charging as the second charging characteristic time point, and mark the period between the first charging characteristic time point and the second charging characteristic time point as the charging monitoring cycle;

[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 time periods of equal time, and name the marked multiple charging monitoring time periods as the first charging monitoring time period to the ath charging monitoring time 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 the charging monitoring period, and a is an integer greater than 0;

[0107] Performing battery charging monitoring in a first charging monitoring period to obtain an actual charging amount in the first period and a first charging amount 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, obtaining a first battery capacity value; obtaining a battery capacity value corresponding to an end time point of the first charging monitoring period, obtaining a second battery capacity value; calculating a difference between the first battery capacity value and the second battery capacity value, taking an absolute value of the obtained difference, obtaining an actual charge amount of the period corresponding to the first charging monitoring period, and naming it as the first period actual charge amount;

[0110] In the first charging monitoring period, several charging monitoring time points are marked, and the charging power value corresponding to each charging monitoring time point of the battery is obtained respectively to obtain multiple charging power values, and the average of the obtained multiple charging power values ​​is calculated to obtain the average charging power of the period;

[0111] Acquire the time length of the first charging monitoring period to obtain the charging time length of the period;

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

[0113] The first charge amount deviation is calculated, and the specific formula is as follows:

[0114] Cdp1 = |Sc1 - (Cgl × Csc) |;

[0115] Wherein, Cdp1 is the first charge amount deviation, Sc1 is the actual charge amount in the first period, Cg l 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 cycle;

[0118] Repeat the process of obtaining the actual charging capacity of the first time period, and obtain the actual charging capacity of the time periods corresponding to the second charging monitoring time period to the ath charging monitoring time period, so as to obtain the actual charging capacity of the second time period to the ath time period;

[0119] The actual charging capacity of the first period to the actual charging capacity of the ath period are summed 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 actual charge amount deviation of the cycle and the battery cycle charge capacity deviation 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] The time point when the electric bicycle driving motor is started is marked as the first discharge characteristic time point, and the time point when the electric bicycle driving motor is turned off is marked as the second discharge characteristic time point, the interval between the first discharge characteristic time point and the second discharge characteristic time point is obtained to obtain the characteristic discharge time, and the benchmark characteristic discharge time is obtained. When the characteristic discharge time is greater than or equal to the benchmark characteristic discharge time, the period between the first discharge characteristic time point and the second discharge characteristic time point is marked as the 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 cycle into a plurality of discharge monitoring time periods of equal duration, and name 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;

[0128] It should be noted here that:

[0129] In the present 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 the 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, taking an absolute value of the obtained difference, obtaining an actual discharge amount of the period corresponding to the first discharge monitoring period, and naming it as the first period actual discharge amount;

[0133] In the first discharge monitoring period, several discharge monitoring time points are marked, and the discharge power value corresponding to each discharge monitoring time point of the battery is obtained respectively to obtain multiple discharge power values, and the average of the obtained multiple discharge power values ​​is calculated to obtain the period average discharge power, and the obtained period average discharge power is named as the first period discharge power;

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

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

[0136] The first discharge amount deviation is calculated, and the specific formula is as follows:

[0137] Fdp1 = |Fc1 - (Fgl × Fsc)|;

[0138] Wherein, Fdp1 is the first discharge amount deviation, Fc1 is the actual discharge amount in the first period, Fg l 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 acquiring the discharge power in the first time period, and respectively acquire the discharge power in the time periods corresponding to the second discharge monitoring time period to the bth discharge monitoring time period, to obtain the discharge power in the second time period to the bth time period;

[0142] Repeat the process of acquiring the actual discharge amount in the first time period, and respectively acquire the actual discharge amounts in the time periods corresponding to the second discharge monitoring time period to the bth discharge monitoring time period, to obtain the actual discharge amounts 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 coordinate, and the actual discharge amount from the first period to the bth period is marked as the vertical coordinate;

[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 a discharge rate line graph;

[0148] In the discharge rate line graph, the slopes of the first coordinate line to the b-1th coordinate line 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;

[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 an average discharge rate deviation of the battery;

[0150] The cycle discharge amount 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 the electric vehicle charging monitoring data, and obtaining the cycle actual charging amount deviation and the battery cycle charging capacity deviation according to the electric vehicle charging monitoring data;

[0154] 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;

[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, and the specific formula is as follows:

[0157]

[0158] Wherein, D lp is the power monitoring evaluation coefficient, Cdp is the actual charge capacity deviation of the cycle, Fdp is the cycle discharge capacity deviation, R lp is the battery cycle charge capacity deviation, and Fds is the battery average discharge rate deviation;

[0159] 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;

[0160] The details are as follows:

[0161] Obtaining a cycle actual charge amount deviation threshold, a battery cycle charge capacity deviation threshold, a cycle discharge amount deviation threshold, and a battery average discharge rate deviation threshold respectively;

[0162] It should be noted here that:

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

[0164] The power monitoring evaluation coefficient threshold is obtained by calculating the cycle actual charge amount deviation threshold, the battery cycle charge capacity deviation threshold, the cycle discharge amount 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] Wherein, D l py is the power monitoring evaluation coefficient threshold, Cdpy is the cycle actual charge capacity deviation threshold, Fdpy is the cycle discharge capacity deviation threshold, R l py 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 assessment coefficient is less than the power monitoring assessment 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 only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. 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 obtain the charging monitoring cycle into multiple charging monitoring periods, obtain the actual charging amount deviation of the cycle by monitoring the charging amount in each charging monitoring period, and obtain the battery cycle charging capacity deviation by monitoring the charging amount deviation in each charging monitoring period, and obtain the electric vehicle charging monitoring data; Step S2: Obtain a discharge monitoring cycle, and obtain the discharge monitoring cycle into multiple discharge monitoring periods, obtain a cycle discharge amount deviation by monitoring the discharge amount in each charging monitoring period, obtain a battery average discharge rate deviation by performing a correlation analysis between the discharge amount and the discharge power in each charging monitoring period, and define the cycle discharge amount deviation and the battery average discharge rate deviation as electric vehicle discharge monitoring data; Step S3: Evaluate the battery status according to the electric vehicle discharge monitoring data and the electric vehicle charge monitoring data.

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 the first charging characteristic time point, marking the time point when the electric bicycle completes charging as the second charging characteristic time point, and marking the period between the first charging characteristic time point and the second charging characteristic time point as the charging monitoring cycle; 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 battery capacity of an electric bicycle according to claim 2, characterized in that: The step S1 further includes the following specific steps: Step S13: performing battery charging monitoring in the first charging monitoring period to obtain an actual charging capacity in the first period and a first charging capacity deviation; Step S14: respectively acquiring 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 cycle actual charge capacity deviation.

4. The method for monitoring the power 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 as the actual charging capacity of the first period.

6. The method for monitoring the power 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, respectively obtaining a charging power value corresponding to each charging monitoring time point of the battery, obtaining a plurality of charging power values, and averaging the obtained plurality of charging power values ​​to obtain an average charging power of the period; Step S133: Acquire 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 of the first time period, the average charging power of the time period, and the charging duration of the time period to obtain the charging capacity deviation of the first charging monitoring time period, and naming it the first charging capacity deviation; A first charge amount deviation is calculated.

7. The method for monitoring the battery capacity of an electric bicycle according to claim 6, characterized in that: The step S16 further includes the following specific steps: Step S161: respectively 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 charging capacity from the first period to the ath period to obtain the cumulative charging capacity of the battery cycle; Step S163: obtaining the battery capacity of the electric bicycle, calculating the difference between the cumulative charge amount 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 of an electric bicycle battery according to claim 1, characterized in that: The step S2 further includes the following specific steps: Step S21: marking the time point when the electric bicycle driving motor is started as the first discharge characteristic time point, marking the time point when the electric bicycle driving motor is turned off as the second discharge characteristic time point, acquiring the interval between the first discharge characteristic time point and the second discharge characteristic time point to obtain the characteristic discharge time, and obtaining the reference characteristic discharge time. If the characteristic discharge time is greater than or equal to the reference characteristic discharge time, marking the period between the first discharge characteristic time point and the second discharge characteristic time point as the 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 in the first period, the first discharge amount deviation and the actual discharge amount in the first period; Step S24: respectively acquiring the discharge amount deviations corresponding to the second discharge monitoring period to the bth discharge monitoring period, and obtaining the second discharge amount deviation to the bth discharge amount deviation; Step S25: Calculate the average of the first discharge amount deviation to the bth discharge amount deviation to obtain a period discharge amount deviation; Step S26: respectively acquiring the discharge powers corresponding to the second discharge monitoring period to the bth discharge monitoring period, and obtaining the discharge powers from the second period to the bth period; Step S27: respectively acquiring the actual discharge amounts corresponding to the second discharge monitoring period to the bth discharge monitoring period, and obtaining the actual discharge amounts from the second period to the bth period; Step S28: Obtain the battery average discharge rate deviation corresponding to the discharge monitoring period.

9. The method for monitoring the power of an electric bicycle battery according to claim 1, characterized in that: 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: Calculate 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 according to the numerical comparison result.

10. An electric bicycle battery power monitoring system, applicable to an electric bicycle battery power monitoring method according to any one of claims 1 to 9, characterized in that: The power monitoring system comprises: Charging data module: used to obtain the actual charging capacity 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 the electric vehicle discharge monitoring data; Power monitoring module: used to evaluate the battery status based on the electric vehicle discharge monitoring data and the electric vehicle charging monitoring data.

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