CN117791812A - Active equalization control method and system for charging and discharging of sodium battery pack - Google Patents
Active equalization control method and system for charging and discharging of sodium battery pack Download PDFInfo
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- CN117791812A CN117791812A CN202311854431.XA CN202311854431A CN117791812A CN 117791812 A CN117791812 A CN 117791812A CN 202311854431 A CN202311854431 A CN 202311854431A CN 117791812 A CN117791812 A CN 117791812A
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 52
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 52
- 239000011734 sodium Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000007599 discharging Methods 0.000 title claims description 10
- 239000000178 monomer Substances 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 9
- 230000005669 field effect Effects 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 15
- 229910001415 sodium ion Inorganic materials 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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Abstract
The invention discloses a method and a system for actively balancing charge and discharge of a sodium battery pack, which relate to the technical field of battery balancing, and are characterized in that firstly, battery parameters of the sodium battery pack are collected, and the sodium battery pack comprises a plurality of sodium battery monomers connected in series; estimating the charge state of each single battery according to the battery parameters; obtaining a target single battery which needs to be actively balanced in charge and discharge according to the charge state of each single battery; acquiring charge and discharge records of a target single battery, and determining the health state of the target single battery; taking the health state and the charge state as balance indexes to obtain an active balance strategy; and executing the active equalization strategy by adopting an active equalization circuit on the target single battery to be charged and the target single battery to be discharged until the charge state of the target single battery meets the preset requirement. The invention provides a novel active equalization method for sodium batteries by taking the state of charge and the state of health as equalization indexes, and improves the charge and discharge efficiency in the equalization process.
Description
Technical Field
The invention relates to the technical field of battery equalization, in particular to a method and a system for actively equalizing charge and discharge of a sodium battery pack.
Background
The lithium battery is unstable in discharge when working at low temperature, however, the discharge performance of the sodium battery is less affected by temperature, and the sodium battery has the advantages of rich raw materials, lower price, long service life, high energy density and the like, is an energy storage battery with application potential in the aspect of large-scale electric energy storage technology, is widely applied to mobile phones, notebook computers, electric tools, electric vehicles, street lamp standby power supplies, navigation lights and household small appliances, and occupies very important energy positions in various large fields.
The active equalization of the sodium battery means that the voltage of each single battery in the sodium battery is monitored and balanced and regulated through a specific equalization circuit or an equalization strategy so as to ensure that each single battery in the battery pack can work in an equalized state, thereby improving the safety and reliability of the battery pack.
The active equalization has the main advantages that adverse effects caused by the difference of different single batteries can be reduced to a certain extent, and the overall service life of the battery pack is prolonged. Meanwhile, the active equalization can also improve the safety of the battery pack and avoid the safety problem caused by overcharging or overdischarging of the single battery.
In the existing active equalization process of the battery, the state of charge is mostly only used as an equalization index, and the factors such as the self-health state of each single battery are not considered, especially for sodium batteries, how to actively equalize the sodium batteries and improve the charge and discharge efficiency is a problem to be solved by the person skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a method and a system for actively balancing and controlling charge and discharge of a sodium battery pack.
In order to achieve the above object, the present invention provides the following technical solutions:
a sodium battery pack charge-discharge active equalization control method comprises the following steps:
step 1, collecting battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery monomers connected in series;
step 2, analyzing and filtering the battery parameters, and estimating the state of charge (SOC) of each single battery;
step 3, obtaining a target single battery which needs to be charged and discharged actively according to the state of charge (SOC) of each single battery;
step 4, acquiring charge and discharge records of a target single battery, and determining the state of health SOH of the target single battery;
step 5, taking the health state SOH and the state of charge SOC as balance indexes to obtain an active balance strategy and send out a balance control instruction;
and 6, executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged until the state of charge (SOC) of the target single battery meets the preset requirement.
Optionally, the battery parameters include at least temperature, voltage, and current.
Alternatively, the state of charge SOC of the battery cell is estimated by a kalman filter method.
Optionally, the method for obtaining the target single battery to be actively balanced in charge and discharge according to the SOC of each single battery in the step 3 includes:
calculating the SOC average value of all the single batteries;
calculating the difference between the SOC of each single battery and the SOC average value;
if the difference value of the single batteries is larger than the preset value, determining the single batteries as target single batteries which need to be charged and discharged actively and uniformly.
Optionally, in step 5, the method for acquiring the active equalization policy includes:
determining whether the target single battery is a target single battery to be charged or a target single battery to be discharged according to the size relation between the SOC and the SOC average value of the target single battery;
and inputting the difference value between the SOC and the SOC mean value of the target single battery and the SOH in a pre-established active equalization model to obtain an active equalization strategy, wherein the active equalization strategy comprises the charging time and the charging current of the target single battery to be charged, and the discharging time and the discharging current of the target single battery to be discharged.
Optionally, in the step 6, the preset requirements are: and the difference value between the SOC of the target single battery and the SOC average value is smaller than a preset value.
A sodium battery pack charge-discharge active equalization control system comprising:
the parameter acquisition module is used for acquiring battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery monomers connected in series;
the charge state calculation module is used for analyzing and filtering the battery parameters and estimating the charge state SOC of each single battery;
the target single battery determining module is used for obtaining target single batteries which need to be charged and discharged actively according to the state of charge (SOC) of each single battery;
the health state calculation module is used for acquiring charge and discharge records of the target single battery and determining the health state SOH of the target single battery;
the strategy acquisition module is used for obtaining an active balancing strategy by taking the health state SOH and the state of charge SOC as balancing indexes and sending a balancing control instruction;
and the active equalization module is used for executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged until the state of charge (SOC) of the target single battery meets the preset requirement.
Optionally, the state of charge calculation module, the target unit cell determination module, the state of health calculation module, and the policy acquisition module are integrated in one data processor.
Optionally, the active equalization circuit comprises an equalization battery, an equalization circuit, a change-over switch, a switching network and a field effect transistor; the equalizing battery is used for increasing or supplementing the capacity of the single battery in the sodium battery pack, the switch network is connected with the equalizing battery or the equalizing circuit through the change-over switch, the equalizing circuit is used for reducing the voltage drop in the loop, and the field effect tube is used for adjusting the output current of the equalizing circuit.
According to the technical scheme, the invention provides a method and a system for actively balancing and controlling the charge and the discharge of a sodium battery pack, which have the following beneficial effects compared with the prior art:
according to the invention, firstly, a target single battery is obtained by taking the state of charge (SOC) of the single battery as an index for judging whether the single battery needs to be charged or discharged; and then taking the SOC and SOH as balance indexes to determine the balance strategy of each target single battery, and actively balancing the target single battery. According to the invention, the state of charge (SOC) and the state of health (SOH) are used as the equalization indexes of active equalization, so that not only is the state of charge (SOC) considered, but also the self-health state of each single battery is considered, a novel active equalization method for the sodium battery is provided, and the charge and discharge efficiency in the equalization process is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the method steps of the present invention;
FIG. 2 is a schematic diagram of a system module according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a method for actively balancing and controlling charge and discharge of a sodium battery pack, which is shown in fig. 1 and comprises the following steps:
and step 1, collecting battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery cells connected in series, and the battery parameters at least comprise temperature, voltage and current.
And 2, analyzing and filtering the battery parameters, and estimating the state of charge (SOC) of each single battery by a Kalman filtering method.
The method for acquiring the state of charge by the Kalman filtering method comprises the following steps:
firstly, acquiring sodium ion battery data in a preset sampling interval, and determining external characteristic parameters of a battery;
based on the battery external characteristic parameters, determining a first sodium ion battery state of charge estimation value by using a table look-up method;
acquiring a state of charge of a sodium ion battery, and determining a second state of charge estimation value of the sodium ion battery by utilizing an ampere-hour integration method based on the sodium ion battery data and the state of charge of the sodium ion battery;
determining a third sodium ion battery state-of-charge estimation value by using an extended Kalman filtering method based on the sodium ion battery state-of-charge quantity;
and acquiring preset weights, and determining a sodium ion battery state of charge estimation value based on the first sodium ion battery state of charge estimation value, the second sodium ion battery state of charge estimation value, the third sodium ion battery state of charge estimation value and the preset weights.
In addition, the state of charge of the sodium battery can be estimated by an integration method, an equivalent circuit method and the like, and the invention is not limited to this.
Step 3, obtaining a target single battery which needs to be charged and discharged actively according to the state of charge (SOC) of each single battery, and specifically:
step 3.1, calculating the SOC average value of all the single batteries;
step 3.2, calculating the difference value between the SOC of each single battery and the SOC average value;
and 3.3, if the difference value of the single batteries is larger than a preset value, determining the single battery as a target single battery which needs to be charged and discharged actively and uniformly.
Step 4, acquiring charge and discharge records of a target single battery, and determining the state of health SOH of the target single battery; the charge-discharge record includes the number of charge or discharge times, the charge or discharge state, the charge or discharge time, and the charge or discharge temperature.
The method for acquiring the SOH of the health state of the target single battery comprises the following steps:
based on historical test data of the sodium ion battery, a wavelet analysis method is adopted to construct an SOH global attenuation trend model and a local capacity regeneration fluctuation autoregressive model, and a voltage-based characteristic extraction method is adopted to construct an available capacity model;
acquiring historical cycle data of a sodium ion battery to be predicted, and respectively calculating SOH attenuation trend, local capacity information and available capacity information of the sodium ion battery under the current cycle based on the SOH global attenuation trend model, the local capacity regeneration fluctuation autoregressive model and the available capacity model;
and carrying out information fusion on the SOH attenuation trend, the local capacity information and the available capacity information to obtain a final battery health state predicted value.
In addition, the state of health SOH of the sodium battery can be estimated by other methods, which is not limited by the present invention.
Step 5, taking the health state SOH and the state of charge SOC as balance indexes to obtain an active balance strategy and send out a balance control instruction;
the method for acquiring the active equalization strategy comprises the following steps:
determining whether the target single battery is a target single battery to be charged or a target single battery to be discharged according to the size relation between the SOC and the SOC average value of the target single battery;
and inputting the difference value between the SOC and the SOC mean value of the target single battery and the SOH in a pre-established active equalization model to obtain an active equalization strategy, wherein the active equalization strategy comprises the charging time and the charging current of the target single battery to be charged, and the discharging time and the discharging current of the target single battery to be discharged.
The pre-established active equalization model is obtained by training a network model by taking an SOC difference value and an SOH in a data set as input characteristics and taking time and current as output characteristics, wherein the SOC difference value is the difference value between the SOC and the SOC mean value of the target single battery. After the SOC difference value and the SOH are input, the model outputs the corresponding optimal time and current. And then charging and discharging for corresponding time according to whether the target single battery is in a state to be charged or in a state to be discharged.
And 6, executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged, judging that the state of charge (SOC) of each target single battery meets the preset requirement after the control instruction is executed, and returning to the step 1 if the state of charge (SOC) of each target single battery does not meet the preset requirement until the state of charge (SOC) of each target single battery meets the preset requirement. The preset requirements are as follows: and the difference value between the SOC of the target single battery and the SOC average value is smaller than a preset value.
The invention further discloses a sodium battery pack charge-discharge active equalization control system, which comprises a parameter acquisition module, a data processing module and an active equalization module, wherein the data processing module comprises a charge state calculation module, a target single battery determination module, a health state calculation module and a strategy acquisition module, and is used for carrying out data processing and issuing related instructions. Specific:
the parameter acquisition module is used for acquiring battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery monomers connected in series;
the charge state calculation module is used for analyzing and filtering the battery parameters and estimating the charge state SOC of each single battery;
the target single battery determining module is used for obtaining target single batteries which need to be charged and discharged actively according to the state of charge (SOC) of each single battery;
the health state calculation module is used for acquiring charge and discharge records of the target single battery and determining the health state SOH of the target single battery;
the strategy acquisition module is used for obtaining an active balancing strategy by taking the health state SOH and the state of charge SOC as balancing indexes and sending a balancing control instruction;
and the active equalization module is used for executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged until the state of charge (SOC) of the target single battery meets the preset requirement. The active equalization circuit comprises an equalization battery, an equalization circuit, a change-over switch, a switching network and a field effect transistor; the equalizing battery is used for increasing or supplementing the capacity of the single battery in the sodium battery pack, the switch network is connected with the equalizing battery or the equalizing circuit through the change-over switch, the equalizing circuit is used for reducing the voltage drop in the loop, and the field effect tube is used for adjusting the output current of the equalizing circuit.
For the system module disclosed in the embodiment, since the system module corresponds to the method disclosed in the embodiment, the description is simpler, and the relevant points refer to the description of the method section.
The invention also discloses a computer readable storage medium having stored thereon a computer program to be loaded by a processor for performing the steps of the above method.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The active equalization control method for the charge and discharge of the sodium battery pack is characterized by comprising the following steps of:
step 1, collecting battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery monomers connected in series;
step 2, analyzing and filtering the battery parameters, and estimating the state of charge (SOC) of each single battery;
step 3, obtaining a target single battery which needs to be charged and discharged actively according to the state of charge (SOC) of each single battery;
step 4, acquiring charge and discharge records of a target single battery, and determining the state of health SOH of the target single battery;
step 5, taking the health state SOH and the state of charge SOC as balance indexes to obtain an active balance strategy and send out a balance control instruction;
and 6, executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged until the state of charge (SOC) of the target single battery meets the preset requirement.
2. The method for actively equalizing charge and discharge of a sodium battery according to claim 1, wherein said battery parameters comprise at least temperature, voltage, and current.
3. The method for actively equalizing charge and discharge of a sodium battery pack according to claim 1, wherein the state of charge SOC of the unit cell is estimated by a kalman filter method.
4. The method for actively balancing charge and discharge of a sodium battery pack according to claim 1, wherein the method for obtaining the target single battery to be actively balanced in charge and discharge according to the SOC of each single battery in step 3 comprises the following steps:
calculating the SOC average value of all the single batteries;
calculating the difference between the SOC of each single battery and the SOC average value;
if the difference value of the single batteries is larger than the preset value, determining the single batteries as target single batteries which need to be charged and discharged actively and uniformly.
5. The method for actively equalizing charge and discharge of a sodium battery pack according to claim 4, wherein in step 5, the method for obtaining an active equalization strategy comprises:
determining whether the target single battery is a target single battery to be charged or a target single battery to be discharged according to the size relation between the SOC and the SOC average value of the target single battery;
and inputting the difference value between the SOC and the SOC mean value of the target single battery and the SOH in a pre-established active equalization model to obtain an active equalization strategy, wherein the active equalization strategy comprises the charging time and the charging current of the target single battery to be charged, and the discharging time and the discharging current of the target single battery to be discharged.
6. The method for actively equalizing charge and discharge of a sodium battery pack according to claim 4, wherein in the step 6, the preset requirements are: and the difference value between the SOC of the target single battery and the SOC average value is smaller than a preset value.
7. The active equalization control system for charging and discharging of the sodium battery pack is characterized by comprising the following components:
the parameter acquisition module is used for acquiring battery parameters of a sodium battery pack, wherein the sodium battery pack comprises a plurality of sodium battery monomers connected in series;
the charge state calculation module is used for analyzing and filtering the battery parameters and estimating the charge state SOC of each single battery;
the target single battery determining module is used for obtaining target single batteries which need to be charged and discharged actively according to the state of charge (SOC) of each single battery;
the health state calculation module is used for acquiring charge and discharge records of the target single battery and determining the health state SOH of the target single battery;
the strategy acquisition module is used for obtaining an active balancing strategy by taking the health state SOH and the state of charge SOC as balancing indexes and sending a balancing control instruction;
and the active equalization module is used for executing the active equalization strategy and the equalization control instruction by adopting an active equalization circuit to the target single battery to be charged and the target single battery to be discharged until the state of charge (SOC) of the target single battery meets the preset requirement.
8. The active equalization control system of sodium battery charge and discharge of claim 7, wherein the state of charge calculation module, the target cell determination module, the state of health calculation module, and the policy acquisition module are integrated into one data processor.
9. The active equalization control system of claim 7, wherein the active equalization circuit comprises an equalization battery, an equalization circuit, a change-over switch, a switching network and a field effect transistor; the equalizing battery is used for increasing or supplementing the capacity of the single battery in the sodium battery pack, the switch network is connected with the equalizing battery or the equalizing circuit through the change-over switch, the equalizing circuit is used for reducing the voltage drop in the loop, and the field effect tube is used for adjusting the output current of the equalizing circuit.
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| CN118198543A (en) * | 2024-05-17 | 2024-06-14 | 湖南麦格米特电气技术有限公司 | Battery equalization control method, system, terminal and computer readable storage medium |
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| CN118198543A (en) * | 2024-05-17 | 2024-06-14 | 湖南麦格米特电气技术有限公司 | Battery equalization control method, system, terminal and computer readable storage medium |
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