CN104597404A - Automatic marking method of actual battery capacity, SOC (state of charge) and SOH (state of health) - Google Patents
Automatic marking method of actual battery capacity, SOC (state of charge) and SOH (state of health) Download PDFInfo
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Abstract
The invention discloses an automatic marking method of actual battery capacity. The automatic marking method of the actual battery capacity includes the following steps: recording accumulated discharge AH, accumulated charge AH and accumulated ampere-hour electric quantity during the battery working process; determining the initial time and finish time of the battery discharging process according to the accumulated ampere-hour electric quantity; calculating the actual battery capacity according to the accumulated discharge AH and the accumulated charge AH at initial time and finish time, wherein the actual capacity is equal to /A12-A11/-A22-A21/, and A 12 is the accumulated discharge AH at the finish time, and A11 is the accumulated discharge AH at the initial time; A22 is the accumulated charge AH at the finish time, and A21 is the accumulated charge AH at the initial time. The automatic marking method of the actual battery capacity is good in both instantaneity and universality and suitable for various batteries. The invention further discloses an automatic marking method of a battery SOC (state of charge) and an automatic marking method of a battery SOH (state of health).
Description
Technical field
The present invention relates to technical field of battery management, particularly relate to the automatic calibration method of a kind of battery actual capacity, SOC and SOH.
Background technology
Battery is that user needs accurately to understand the information grasped as its performance quality of energy supply device.The new battery Shi Douhui that dispatches from the factory marks a capability value and nominal capacity.Nominal capacity is not identical with the actual capacity of battery.Some producer in order to the actual capacity of the ratio battery that nominal capacity can mark by the security that uses little, but also the ratio actual capacity that marked by nominal capacity in order to number one of some producer is high.And battery in use can occur aging, the actual capacity of battery also can be more and more less.In traditional battery management, mostly the estimation of battery actual capacity is that, for a kind of and single battery, its versatility is poor, and can not real-time be realized.In actual application, the health status (State of Health, SOH) of battery and state-of-charge (State of Charge, SOC) are the two indices evaluating battery quality outbalance.Wherein, the nominal capacity of the actual capacity/battery of SOH=battery; The actual capacity of the residual capacity/battery of SOC=battery.
Summary of the invention
Based on this, be necessary for the problems referred to above, provide a kind of versatility good and there is the automatic calibration method of the battery actual capacity of real-time.
A kind of automatic calibration method of battery SOC is also provided.
The automatic calibration method of a kind of battery SOH is also provided.
An automatic calibration method for battery actual capacity, comprises the following steps: the accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity; Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity; The actual capacity of described battery is calculated according to the accumulated discharge ampere-hour number of initial time, finish time and accumulative charging ampere-hour number,
Actual capacity=| A12-A11|-|A22-A21|
Wherein, A12 is the accumulated discharge ampere-hour number of finish time, and A11 is the accumulated discharge ampere-hour number of initial time, and A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time.
Wherein in an embodiment, after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity, also comprise step: the accumulative ampere-hour electric quantity curve of drawing battery according to described accumulative ampere-hour electricity.
Wherein in an embodiment, described battery is single battery or electric battery.
An automatic calibration method for battery SOC, comprises the following steps: the accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity; Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity; According to the accumulated discharge ampere-hour number of initial time, finish time and the actual capacity of accumulative charging ampere-hour number calculating battery, actual capacity=| A12-A11|-|A22-A21|, wherein, A12 is the accumulated discharge ampere-hour number of finish time, A11 is the accumulated discharge ampere-hour number of initial time, A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time; According to the accumulated discharge ampere-hour number of the battery of current time and the SOC value of accumulative charging ampere-hour number calculating battery,
SOC=[actual capacity-(| A13-A11|-|A23-A21|)]/actual capacity
Wherein, A13 is the accumulated discharge ampere-hour number of current time, and A23 is the accumulative charging ampere-hour number of current time.
Wherein in an embodiment, after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity, also comprise step: the accumulative ampere-hour electric quantity curve of drawing battery according to described accumulative ampere-hour electricity.
Wherein in an embodiment, described battery is single battery or electric battery.
An automatic calibration method of battery SOH, comprises the following steps: the accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity; Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity; The actual capacity of described battery is calculated according to the accumulated discharge ampere-hour number of initial time, finish time and accumulative charging ampere-hour number, actual capacity=| A12-A11|-|A22-A21|, wherein, A12 is the accumulated discharge ampere-hour number of finish time, A11 is the accumulated discharge ampere-hour number of initial time, A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time; Calculate the SOH value of battery, the nominal capacity of the actual capacity/battery of described SOH=battery.
Wherein in an embodiment, after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity, also comprise step: the accumulative ampere-hour electric quantity curve of drawing battery according to described accumulative ampere-hour electricity.
Wherein in an embodiment, described battery is single battery or electric battery.
Wherein in an embodiment, after the step of the SOH value of described calculating battery, also comprise step: judge that whether described SOH value is lower than preset value, if it is give the alarm and export described SOH value.
The automatic calibration method of above-mentioned battery actual capacity, SOC and SOH, carry out recording the automatic Calibration that can realize battery actual capacity to the accumulated discharge ampere-hour number in battery operated and accumulative charging ampere-hour number by real-time, there is good real-time and versatility, be applicable to various battery.Meanwhile, in the process record accumulated discharge ampere-hour number and accumulative charging ampere-hour number, can't be subject to the restriction of specific environment, the applicability of environment is better, and antijamming capability is stronger.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the automatic calibration method of battery actual capacity in an embodiment;
Fig. 2 be embodiment illustrated in fig. 1 in battery actual capacity automatic calibration method in the accumulative ampere-hour electric quantity curve figure that formed;
Fig. 3 is the process flow diagram of the automatic calibration method of battery SOC in an embodiment;
Fig. 4 is the process flow diagram of the automatic calibration method of battery SOH in an embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
An automatic calibration method for battery actual capacity, it can carry out automatic Calibration to the actual capacity comprising lithium battery etc.Figure 1 shows that the process flow diagram of the automatic calibration method of the battery actual capacity in an embodiment, comprise the following steps.
S110, the accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity.
Also may discharge because battery may charge in practical work process, therefore to cell operations, record be carried out to its accumulated discharge ampere-hour number and accumulative charging ampere-hour number.In the present embodiment, the accumulated discharge ampere-hour number in system meeting real time record cell operations and accumulative charging ampere-hour number.In other examples, system also can accumulated discharge ampere-hour number in periodic logging cell operations and accumulative charging ampere-hour number.In the present embodiment, also accumulative ampere-hour electric quantity curve figure can be formed according to the accumulative ampere-hour electricity of record battery, as shown in Figure 2.
S120, determines initial time and the finish time of battery discharge procedure.
According to the initial time of the accumulative ampere-hour electricity determination battery discharge procedure of battery.In the present embodiment, the initial time of battery discharge refers to that battery is charged to cannot when charging, and namely battery has the moment of largest cumulative ampere-hour electricity.The finish time of battery discharge then refers to that battery discharge is to the moment that cannot discharge again, and namely now battery has minimum accumulative ampere-hour electricity.In the present embodiment, initial time A and the finish time B of battery discharge procedure can be confirmed very intuitively from the accumulative ampere-hour electric quantity curve Fig. 2.
S130, according to the accumulated discharge ampere-hour number of initial time, finish time and the actual capacity of accumulative charging ampere-hour number calculating battery.
Go to obtain the accumulated discharge ampere-hour number in corresponding moment and accumulative charging ampere-hour number according to the initial time determined and finish time.In the present embodiment, the accumulated discharge ampere-hour number of initial time is A11, and the accumulated discharge ampere-hour number of finish time is A12, and the accumulative charging ampere-hour number of initial time is A21, and the accumulative charging ampere-hour number of finish time is A22.According to the actual capacity of the correlation value calculation battery got.The computing formula of the actual capacity of battery is:
Actual capacity=| A12-A11|-|A22-A21|
After calculating actual capacity, both can realize the automatic Calibration of the actual capacity to battery.
The automatic calibration method of above-mentioned battery actual capacity, carry out recording the automatic Calibration that can realize battery actual capacity to the accumulated discharge ampere-hour number in battery operated and accumulative charging ampere-hour number by real-time, there is good real-time and versatility, be applicable to various battery.Meanwhile, in the process record accumulated discharge ampere-hour number and accumulative charging ampere-hour number, can't be subject to the restriction of specific environment, the applicability of environment is better, and antijamming capability is stronger.
In the present embodiment, battery can be single battery, and can be whole heap, whole bunch, the electric battery of whole bag, it goes for various battery system, without the need to manual intervention.The automatic calibration method of the actual capacity of above-mentioned battery can be used in onboard system, also may be used for large-scale accumulator system.And calibration process is just carried out in real time in the course of work of battery, do not need specifically to send instruction, or manufacture special environment, save time, man power and material so greatly.
In the present embodiment, after calculating the actual capacity value obtaining battery, also can calculate according to different times the actual capacity obtained draw calibration curve, thus intuitively the actual capacity situation of change of battery be monitored and managed.When the state of the actual capacity display battery of battery is comparatively bad, system initiatively can apply for manual maintenance, ensures that battery system puts into operation with a kind of state of health.
Fig. 3 is the automatic calibration method of the battery SOC in an embodiment, and it comprises step S310 ~ S340.Due to the personal calibration process of battery SOC in the present invention be the automatic calibration method of actual capacity based on battery basis on carry out, therefore, step S310 ~ S340 is the automatic Calibration process of the actual capacity of battery, does not repeat herein.
S340, according to the accumulated discharge ampere-hour number of the battery of current time and the SOC value of accumulative charging ampere-hour number calculating battery.
SOC value is the index parameter of the residual capacity of characterizing battery, therefore needs the accumulated discharge ampere-hour number of the battery obtaining current time and accumulative charging ampere-hour number.In the present embodiment, the accumulated discharge ampere-hour number got is A13, and accumulative charging ampere-hour number is A23.After the accumulated discharge ampere-hour number and accumulative charging ampere-hour number of the battery of acquisition current time, calculate the SOC value of battery.
In this enforcement, the formula calculating the SOC value of battery is:
SOC=[actual capacity-(| A13-A11|-|A23-A21|)]/actual capacity
Wherein, (| A13-A11|-|A23-A21|) be the clean electric discharge ampere-hour number of battery from initial time to current time.
The automatic calibration method of above-mentioned battery SOC, the current time accumulative charging ampere-hour number of battery and accumulated discharge ampere-hour number all can directly get, and precision is higher.By first demarcating the actual capacity of battery, then calculating current clean electric discharge ampere-hour number thus the last residual capacity obtaining battery, making the battery remaining power demarcating out have higher precision.It is all become one-to-one relationship according to SOC with open-circuit voltage OCV (Open Circuit Voltage) that traditional battery capacity is demarcated, thus utilizes the SOC value of battery open circuit voltage estimating battery.This method is not also suitable for each battery, and due to the OCV curve of battery comparatively smooth, make the estimation of SOC value inaccurate.In addition, the ultimate principle of open-circuit voltage method is by battery sufficient standing, and make battery terminal voltage return to open-circuit voltage, time of repose generally, more than 1 hour, is not suitable for real time on-line monitoring.And the present invention can be good at overcoming these problems, realize the accurately automatic real-time calibration of SOC value.
Fig. 4 is the automatic calibration method of the battery SOH in an embodiment, comprises step S410 ~ S440.
Because the automatic calibration method of battery SOH is that basis based on the automatic calibration method of battery real time capacity is carried out, step S410 ~ S430 is the automatic Calibration process of battery real time capacity, does not repeat herein.
S440, calculates the SOH value of battery.
The formula calculating the SOH of battery is: the nominal capacity of the actual capacity/battery of SOH=battery.
By the demarcation of the actual capacity to battery thus the automatic Calibration realized battery SOH parameter, be convenient to the timely health status of electrolytic cell of user, Timeliness coverage battery failures and problem.
In the present embodiment, when battery SOH value is lower than preset value, also can automatically gives the alarm and SOH value be exported to user, thus the current health status of reminding user battery be poor, safeguards in time or change battery.In the present embodiment, default settings is 70%.Namely when SOH value lower than 70% time, namely assert that the life-span of this battery completes, automatically judge that it damages, thus reminding user carries out battery altering or maintenance, to ensure that battery puts into operation with the most healthy a kind of state.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an automatic calibration method for battery actual capacity, comprises the following steps:
Accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity;
Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity;
The actual capacity of described battery is calculated according to the accumulated discharge ampere-hour number of initial time, finish time and accumulative charging ampere-hour number,
Actual capacity=| A12-A11|-|A22-A21|
Wherein, A12 is the accumulated discharge ampere-hour number of finish time, and A11 is the accumulated discharge ampere-hour number of initial time, and A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time.
2. the automatic calibration method of battery actual capacity according to claim 1, is characterized in that, also comprises step after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity:
The accumulative ampere-hour electric quantity curve of battery is drawn according to described accumulative ampere-hour electricity.
3. the automatic calibration method of battery actual capacity according to claim 1, is characterized in that, described battery is single battery or electric battery.
4. an automatic calibration method for battery SOC, comprises the following steps:
Accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity;
Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity;
According to the accumulated discharge ampere-hour number of initial time, finish time and the actual capacity of accumulative charging ampere-hour number calculating battery, actual capacity=| A12-A11|-|A22-A21|, wherein, A12 is the accumulated discharge ampere-hour number of finish time, A11 is the accumulated discharge ampere-hour number of initial time, A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time;
According to the accumulated discharge ampere-hour number of the battery of current time and the SOC value of accumulative charging ampere-hour number calculating battery,
SOC=[actual capacity-(| A13-A11|-|A23-A21|)]/actual capacity
Wherein, A13 is the accumulated discharge ampere-hour number of current time, and A23 is the accumulative charging ampere-hour number of current time.
5. the automatic calibration method of battery SOC according to claim 4, is characterized in that, also comprises step after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity:
The accumulative ampere-hour electric quantity curve of battery is drawn according to described accumulative ampere-hour electricity.
6. the automatic calibration method of battery SOC according to claim 4, is characterized in that, described battery is single battery or electric battery.
7. an automatic calibration method of battery SOH, comprises the following steps:
Accumulated discharge ampere-hour number in record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity;
Initial time and the finish time of described battery discharge procedure is determined according to described accumulative ampere-hour electricity; Described initial time is the moment that battery has largest cumulative ampere-hour electricity; Described finish time is the moment that battery has minimum accumulative ampere-hour electricity;
The actual capacity of described battery is calculated according to the accumulated discharge ampere-hour number of initial time, finish time and accumulative charging ampere-hour number, actual capacity=| A12-A11|-|A22-A21|, wherein, A12 is the accumulated discharge ampere-hour number of finish time, A11 is the accumulated discharge ampere-hour number of initial time, A22 is the accumulative charging ampere-hour number of finish time, and A21 is the accumulative charging ampere-hour number of initial time;
Calculate the SOH value of battery, the nominal capacity of the actual capacity/battery of described SOH=battery.
8. the automatic calibration method of battery SOH according to claim 7, is characterized in that, also comprises step after the step of the accumulated discharge ampere-hour number in described record cell operations, accumulative charging ampere-hour number and accumulative ampere-hour electricity:
The accumulative ampere-hour electric quantity curve of battery is drawn according to described accumulative ampere-hour electricity.
9. the automatic calibration method of battery SOH according to claim 7, is characterized in that, described battery is single battery or electric battery.
10. the automatic calibration method of battery SOH according to claim 7, is characterized in that, also comprises step after the step of the SOH value of described calculating battery:
Judge that whether described SOH value is lower than preset value, if it is give the alarm and export described SOH value.
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