CN113589188A - Battery life evaluation method, device and system - Google Patents
Battery life evaluation method, device and system Download PDFInfo
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- CN113589188A CN113589188A CN202110925249.3A CN202110925249A CN113589188A CN 113589188 A CN113589188 A CN 113589188A CN 202110925249 A CN202110925249 A CN 202110925249A CN 113589188 A CN113589188 A CN 113589188A
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- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000013075 data extraction Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The invention discloses a method, a device and a system for evaluating the service life of a battery. The battery life evaluation method comprises the following steps: acquiring historical charging capacity, historical discharging capacity and nominal capacity throughput of the battery module; and determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity, and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput. The battery life evaluation method provided by the invention determines the service life of the battery module through the charging and discharging capacity of the battery module, and can directly acquire the charging capacity and the discharging capacity through components such as the BMS and the like in the use process of the battery module, so that the service life of the battery module is rapidly determined, the BMS can master the health state of the battery module in real time, the battery management of the whole service life cycle of the battery module is well done, the reasonable utilization of power resources is finally achieved, and the maximum economic benefit is realized.
Description
Technical Field
The present invention relates to battery technologies, and in particular, to a method, an apparatus, and a system for estimating a battery life.
Background
SOH (State of Health) research is beneficial to mastering the influence factors of battery aging and provides theoretical guidance for the use and maintenance of the battery. When a BMS (Battery Management System) estimates the state of charge of a Battery, it is usually necessary to refer to the remaining power, the capacity of the Battery, and the aging state, and if the Battery Management System can grasp the aging rule and the health state of the Battery, it is helpful to perform Battery Management of the Battery in a full life cycle. In short, SOH is the second core parameter in the BMS algorithm except for SOC (State of Charge), and is significant for battery echelon utilization and fault detection.
Currently, there are many methods for estimating the lifetime of a new cell or battery module, generally classified into two categories: data-driven based methods and model-based methods. The method generally determines the service life of the battery based on the direct current impedance of the battery or the equivalent cycle number of the battery, and the calculation process is complex.
In addition, in the prior art, the methods for estimating the service life of the battery pack including the new and old battery modules are few, and the SOH of the battery pack including only the old battery module is generally used as the SOH of the battery pack including the new and old battery modules, so the accuracy of service life estimation is poor.
Disclosure of Invention
The invention provides a method, a device and a system for evaluating the service life of a battery, which are used for achieving the purposes of rapidly determining the service life of a battery module and enabling a BMS to master the health state of the battery module in real time.
In a first aspect, an embodiment of the present invention provides a method for evaluating a battery life, which obtains a historical charging capacity, a historical discharging capacity, and a nominal capacity throughput of a battery module;
and determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity, and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
Further, acquiring the charging times and the charging capacity of each charging;
and calculating the historical charging capacity of the battery module according to the charging times and the charging capacity of each time.
Further, obtaining the discharge times and the discharge capacity of each discharge;
and calculating the historical discharge capacity of the battery module according to the discharge times and the discharge capacity of each discharge.
Further, the formula for calculating the historical charging capacity is as follows:
wherein m is the number of charges, aiFor charging in one stepCapacity.
Further, the formula adopted for calculating the historical discharge capacity is as follows:
wherein n is the number of discharges, biThe charge capacity of one discharge.
Further, the method also comprises the following steps:
determining the number of the battery modules, and determining the capacity throughput of the battery pack according to the capacity throughput of each battery module;
determining the nominal capacity throughput of the battery pack according to the nominal capacity throughput of each battery module;
and determining the service life of the battery pack according to the capacity throughput of the battery pack and the nominal capacity throughput of the battery pack.
Further, acquiring the nominal cycle number and the nominal capacity of the battery module;
and determining the nominal capacity throughput according to the nominal cycle times and the nominal capacity.
Further, judging whether the capacity throughput of the battery module reaches the nominal capacity throughput;
and if the capacity throughput of the battery module reaches the nominal capacity throughput, marking the battery module as a module to be retired.
In a second aspect, an embodiment of the present invention further provides a battery life evaluation apparatus, including a data extraction unit and a life calculation unit;
the data extraction unit is used for acquiring historical charging capacity, historical discharging capacity and nominal capacity throughput of the battery module;
the service life calculating unit is used for determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
In a third aspect, an embodiment of the present invention further provides a battery life evaluation system, which includes a controller, where the controller is configured with an executable program, and the executable program is used to implement the battery life evaluation method described in the embodiment of the present invention when running.
Compared with the prior art, the invention has the beneficial effects that: the battery life evaluation method provided by the invention determines the service life of the battery module through the charging and discharging capacity of the battery module, and can directly acquire the charging capacity and the discharging capacity through components such as the BMS and the like in the use process of the battery module, so that the service life of the battery module is rapidly determined, the BMS can master the health state of the battery module in real time, the battery management of the whole service life cycle of the battery module is well done, the reasonable utilization of power resources is finally achieved, and the maximum economic benefit is realized.
Drawings
FIG. 1 is a flow chart of a battery life assessment method in an embodiment;
FIG. 2 is a flow chart of another battery life assessment method in an embodiment;
fig. 3 is a schematic diagram of a battery life evaluation device in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a battery life evaluation method in an embodiment, and referring to fig. 1, the battery life evaluation method includes:
s101, obtaining historical charging capacity, historical discharging capacity and nominal capacity throughput of the battery module.
For example, in the present embodiment, the historical charging capacity and the historical discharging capacity of the battery module may be recorded by the BMS. When the life of the battery module needs to be calculated, the required historical charging capacity and historical discharging capacity are obtained from the BMS.
For example, in this embodiment, the historical charging capacity represents the amount of electricity charged after the battery module is shipped and assembled in the power utilization system; the historical discharge capacity represents the accumulated discharged electric quantity after the battery module is delivered and assembled in an electric system.
Illustratively, the BMS may be configured to calculate the historical charging capacity and the historical discharging capacity in addition to being configured to store the historical charging capacity and the historical discharging capacity.
Illustratively, taking calculation of historical charging capacity as an example, in the charging process of the battery module, the BMS may be configured to collect the charging current of the battery module, integrate the charging current in the charging process, and obtain the charging capacity in the current charging process after the current charging process is finished;
if the current charging process is the first charging process of the battery module, storing the charging capacity of the current charging process, wherein the stored charging capacity is the historical charging capacity;
and if the current charging process is not the first charging process of the battery module, overlapping the charging capacity of the current charging process with the stored historical charging capacity to finish updating the historical charging capacity.
For example, in this embodiment, the method for calculating the charging capacity and the discharging capacity of the BMS is not particularly limited, and a corresponding charging and discharging capacity calculation method in the prior art may be configured according to different requirements for the operation speed or the operation accuracy.
And S102, determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity, and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
In this embodiment, the capacity throughput is used to represent the sum of the accumulated charged and discharged electric quantities of the battery module, and in this step, the capacity throughput may be determined by the sum of the historical charging capacity and the historical discharging capacity.
For example, in this embodiment, the nominal capacity throughput is the sum of the accumulated charged and discharged electric quantities of the battery module determined before the battery module leaves the factory.
For example, the nominal capacity throughput may be determined by a manufacturer of the battery module through a calibration test, and the embodiment is not particularly limited to the manner of determining the nominal capacity throughput.
For example, in this embodiment, the nominal capacity throughput may be used as a basis for determining whether the battery module is discarded (i.e., the battery module is out of service), and when the sum of the accumulated charging amount and the accumulated discharging amount of the battery module reaches the nominal capacity throughput, the battery module is determined to be discarded.
For example, in the present embodiment, the life of the battery module may be determined as follows:
Qm＝Qc+Qd
in the formula, QncFor nominal capacity throughput, QcFor historical charging capacity, QdIs the historical discharge capacity.
The battery life evaluation method provided by the embodiment determines the service life of the battery module through the charging and discharging capacity of the battery module, can directly acquire the charging capacity and the discharging capacity through components such as the BMS in the use process of the battery module, further quickly determines the service life of the battery module, enables the BMS to master the health state of the battery module in real time, well manages the battery of the whole life cycle of the battery module, finally achieves reasonable utilization of power resources, and achieves the maximum economic benefit.
Example two
Fig. 2 is a flow chart of another battery life evaluation method in the example, and referring to fig. 2, as an implementation, the battery life evaluation method may further include:
s201, determining the number of the battery modules, and determining the capacity throughput of the battery pack according to the capacity throughput of each battery module.
For example, the battery pack may include a plurality of battery modules as a power source of an electric device (e.g., an electric vehicle), and the battery life evaluation method provided in this embodiment is mainly used for determining the life of the battery pack.
For example, the type of the battery pack used by the same electric device is generally fixed, and correspondingly, the number of the battery modules is relatively fixed. When the BMS of the battery pack is configured, one register in the BMS can be configured to correspond to one battery module, and the BMS determines the number of the battery modules according to the number of the configured registers for recording the data of the battery modules.
For example, the loss conditions of different battery modules in one battery pack have a certain difference, and in this step, the capacity throughput of each battery module is calculated respectively, and then the capacity throughput of the battery pack is further determined.
For example, in this embodiment, the manner of determining the capacity throughput of one battery module includes:
acquiring the charging times and the charging capacity of each time, and calculating the historical charging capacity of the battery module according to the charging times and the charging capacity of each time;
acquiring the discharge times and the discharge capacity of each discharge, and calculating the historical discharge capacity of the battery module according to the discharge times and the discharge capacity of each discharge;
and determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity of the battery module.
Specifically, the formula for calculating the historical charging capacity of the battery module is as follows:
wherein m is the number of charges, aiA charging capacity for one charge.
The formula for calculating the historical discharge capacity of the battery module is as follows:
wherein n is the number of discharges, biThe charge capacity of one discharge.
The formula for calculating the capacity throughput of the battery module is as follows:
Qm＝Qc+Qd
the formula for calculating the capacity throughput of the battery pack is:
wherein k is the number of battery modules, Qm_iIndicating the capacity throughput of the ith battery module.
S202, determining the nominal capacity throughput of the battery pack according to the nominal capacity throughput of each battery module.
Illustratively, in this step, the sum of the nominal capacity throughputs of each battery module in one battery pack is taken as the nominal capacity throughput of the battery pack.
For example, if the manufacturer does not give the nominal capacity throughput of the battery module before the factory shipment, the nominal capacity throughput of the battery module may be determined as follows.
And acquiring the nominal cycle times and the nominal capacity of the battery module, and determining the nominal capacity throughput according to the nominal cycle times and the nominal capacity.
For example, in this embodiment, the nominal capacity may be determined according to the amount of electricity discharged when the battery module is discharged to the empty state according to a certain discharge current (e.g., 0.2C to 1C) in the full-electricity state.
For example, in the present embodiment, the nominal cycle number is used to indicate the theoretical life of the battery module, and when the full-empty cycle number of the battery module reaches the nominal cycle number, the life of the battery module is theoretically used up.
For example, the nominal cycle number is directly provided by the manufacturer of the battery module, and the embodiment does not specifically limit the manner of determining the nominal cycle number.
Specifically, the formula for determining the nominal capacity throughput according to the nominal cycle number and the nominal capacity is as follows:
Qnc＝K×Q
wherein K is the nominal cycle number of the battery module, and Q is the nominal capacity of the battery module.
Illustratively, the formula used to determine the nominal capacity throughput of a battery pack is as follows:
wherein k is the number of battery modules, Qnc_iIndicating the nominal capacity throughput of the ith battery module.
And S203, determining the service life of the battery pack according to the capacity throughput of the battery pack and the nominal capacity throughput of the battery pack.
In this step, the formula for calculating the life of the battery pack is as follows:
as an implementable embodiment, in this embodiment, after determining the capacity throughput of the battery module, the method further includes determining whether the capacity throughput of the battery module reaches the nominal capacity throughput, and if the capacity throughput of the battery module reaches the nominal capacity throughput, marking the battery module as a to-be-retired module.
For example, in a battery pack, if there is a battery module whose capacity throughput has reached the factory-set nominal capacity throughput, the battery module needs to be decommissioned and replaced with a new battery module of the same type.
For example, if one or more new battery modules are replaced in the battery pack, the new battery module and the old battery module exist in the battery at the same time, at this time, if the service life of the battery pack is calculated immediately, the capacity throughput of the new battery module can be directly marked as 0, correspondingly, a register for storing data of the new battery module is initialized, and the historical charging capacity and the historical discharging capacity which are stored in the register are cleared.
On the basis of the beneficial effects of the first proposed scheme, the battery life evaluation method provided by the embodiment can be used for determining the life of the battery pack. Particularly, when the service life of the battery pack is determined, the battery pack can simultaneously contain a new battery module and an old battery module, the service life of the battery pack containing the new battery module and the old battery module can be conveniently determined by the battery life assessment method provided by the embodiment, the battery management of the whole service life cycle of the battery pack is facilitated, and the method has important significance for the step utilization of the subsequent battery pack.
EXAMPLE III
Fig. 3 is a schematic diagram of a battery life evaluation apparatus in an embodiment, and referring to fig. 3, the battery life evaluation apparatus includes a data extraction unit 100 and a life calculation unit 200.
The data extraction unit 100 is configured to: and acquiring the historical charging capacity, the historical discharging capacity and the nominal capacity throughput of the battery module.
The lifetime calculation unit 200 is configured to: and determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity, and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
For example, the battery life evaluation method described in the first embodiment can be implemented by the battery life evaluation device, and the specific implementation process and the beneficial effects thereof are the same as those described in the first embodiment.
As an implementable embodiment, the data extraction unit 100 may be further configured to: acquiring the number of the battery modules, and acquiring the historical charging capacity, the historical discharging capacity and the nominal capacity throughput of each battery module;
the lifetime calculation unit 200 may further be configured to: determining the capacity throughput of the battery pack according to the capacity throughput of each battery module; determining the nominal capacity throughput of the battery pack according to the nominal capacity throughput of each battery module; and determining the service life of the battery pack according to the capacity throughput of the battery pack and the nominal capacity throughput of the battery pack.
For example, in this solution, the battery life evaluation apparatus may implement the battery life evaluation method described in the second embodiment, and the specific implementation process and the beneficial effects thereof are the same as those described in the second embodiment.
Example four
For example, the battery life evaluation methods provided in the first and second embodiments may be implemented in a software manner.
The present embodiment provides a battery life evaluation system, which includes a controller, where the controller is configured with an executable program, and the executable program is used to implement any one of the battery life evaluation methods described in the first embodiment or the second embodiment when the executable program runs.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A battery life assessment method, comprising:
acquiring historical charging capacity, historical discharging capacity and nominal capacity throughput of the battery module;
and determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity, and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
2. The battery life evaluation method according to claim 1, wherein the number of times of charging and the charging capacity per charging are acquired;
and calculating the historical charging capacity of the battery module according to the charging times and the charging capacity of each time.
3. The battery life evaluation method according to claim 1, wherein the number of discharges and the discharge capacity per discharge are obtained;
and calculating the historical discharge capacity of the battery module according to the discharge times and the discharge capacity of each discharge.
4. The battery life assessment method of claim 2, wherein the historical charge capacity is calculated using the formula:
wherein m is the number of charges, aiA charging capacity for one charge.
5. The battery life evaluation method of claim 3, wherein the formula used to calculate the historical discharge capacity is:
wherein n is the number of discharges, biThe charge capacity of one discharge.
6. The battery life assessment method of claim 1, further comprising:
determining the number of the battery modules, and determining the capacity throughput of the battery pack according to the capacity throughput of each battery module;
determining the nominal capacity throughput of the battery pack according to the nominal capacity throughput of each battery module;
and determining the service life of the battery pack according to the capacity throughput of the battery pack and the nominal capacity throughput of the battery pack.
7. The battery life evaluation method of claim 1, wherein a nominal cycle number and a nominal capacity of the battery module are obtained;
and determining the nominal capacity throughput according to the nominal cycle times and the nominal capacity.
8. The battery life assessment method of claim 1, further comprising determining whether a capacity throughput of the battery module reaches a nominal capacity throughput;
and if the capacity throughput of the battery module reaches the nominal capacity throughput, marking the battery module as a module to be retired.
9. A battery life evaluation device is characterized by comprising a data extraction unit and a life calculation unit;
the data extraction unit is used for acquiring historical charging capacity, historical discharging capacity and nominal capacity throughput of the battery module;
the service life calculating unit is used for determining the capacity throughput of the battery module according to the historical charging capacity and the historical discharging capacity and determining the service life of the battery module according to the capacity throughput and the nominal capacity throughput.
10. A battery life assessment system comprising a controller configured with an executable program which when run is operable to implement the battery life assessment method of any one of claims 1 to 8.
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