CN106451582A - Method and apparatus to control the power charge and power discharge - Google Patents
Method and apparatus to control the power charge and power discharge Download PDFInfo
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- CN106451582A CN106451582A CN201510489907.3A CN201510489907A CN106451582A CN 106451582 A CN106451582 A CN 106451582A CN 201510489907 A CN201510489907 A CN 201510489907A CN 106451582 A CN106451582 A CN 106451582A
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 208000028659 discharge Diseases 0.000 claims abstract description 211
- 238000007599 discharging Methods 0.000 claims description 218
- 239000000446 fuel Substances 0.000 claims description 105
- 230000005764 inhibitory process Effects 0.000 claims description 53
- 238000012545 processing Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 description 102
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 33
- 238000006243 chemical reaction Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a method and apparatus to realize the control of power charge and discharge. The method comprises the following steps: according to a preset priority strategy, setting the priority of power charge and discharge for each battery group in a system; and according to a preset power charge and discharge control state corresponding to the power charge and discharge stage of each battery group, carrying out the power charge and discharge based on the priority sequence of the battery groups. In the invention, firstly, a priority of power charge and discharge for each battery group in a system is set according to a priority strategy and then according to a preset power charge and discharge control state corresponding to the power charge and discharge state of each battery group, the power charge and discharge of each battery group can be controlled respectively so as to avoid inappropriate power charge and discharge control that might compromise the service lifetime of the batteries.
Description
Technical Field
The invention relates to a new energy technology, in particular to a method and a device for realizing charge and discharge point control.
Background
With the development of new energy technologies, the role of batteries in communication base stations (including communication devices or communication stations) is changing silently: originally used as a backup battery, the battery is increasingly used in daily work to circularly supply power. Meanwhile, based on the difference between the types of batteries and application scenes, new application schemes are formed by the configuration and use of different batteries, and a common scheme is that a plurality of batteries are selected from lithium batteries, quick-charging batteries, fuel batteries, solar batteries and the like to be configured and matched according to the working characteristics of the batteries. Additionally, some communication devices or stations may be equipped with other types of batteries, such as lead-acid batteries, that may continue to be used based on cost or engineering considerations, where it is common to add one or more other types of batteries to provide power or to configure the same type of old and new batteries for use while retaining their use.
Because different types of batteries and batteries with different old and new degrees have different charging and discharging performances, the charging and discharging control is unreasonable when different types of batteries are used in a mixed manner at present, so that partial types of batteries cannot exert the characteristics of the batteries or the service life of the batteries is influenced; and the mixed use of batteries with different old and new degrees can cause the degradation acceleration of the new battery due to unreasonable charge and discharge control, for example, the same charge and discharge control parameters are set, so that the degradation acceleration of the new battery is caused, and the stability of the system is influenced.
In conclusion, the battery is unreasonable in charging and discharging, and the service life of the battery is easily shortened; in addition, the new and old batteries are used simultaneously, so that the charging and discharging are unreasonable, and the stability of the system is influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for realizing charge and discharge control, which can reasonably control the charge and discharge of a battery in a system and prolong the service life of the battery.
In order to achieve the purpose of the invention, the invention provides a method for realizing charge and discharge control, which comprises the following steps:
setting the charging and discharging priority of each group of batteries in the system according to a preset priority strategy;
and respectively carrying out charging and discharging treatment on each group of batteries according to the priority order according to the corresponding charging and discharging control states of each group of batteries set in each charging and discharging stage in advance.
Further, the method also comprises before;
respectively collecting related parameter information of each group of batteries in the system, and determining the charge and discharge stage of each group of batteries;
the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
Further, the preset priority policy is:
and the priority strategy of the charging and discharging sequence of each group of batteries is set according to the charging and discharging speed of the batteries, and/or the freshness and the cost of the batteries, and/or whether the batteries can be charged.
Further, the related parameter information includes: current value, and/or voltage value, and/or battery temperature.
Further, the charge and discharge phase comprises:
a charging phase, a full charge phase and a discharging phase.
Further, the charge and discharge control state is:
charging and discharging are allowed; or,
charge permission and discharge prohibition; or,
charge disabled, discharge enabled; or,
charging is prohibited and discharging is prohibited.
Further, setting the charge and discharge control state specifically includes:
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
the diode connected in series to the discharge circuit is in an open state by turning on a preset relay, and discharge inhibition is set.
Further, when the system includes a fuel cell stack, the method further includes:
when the fuel stock of the fuel cell is less than a preset alarm threshold, alarm information is generated and fed back to perform fuel replenishment.
On the other hand, the present application further provides a device for implementing charge and discharge control, including: a priority unit and a control unit; wherein,
the priority unit is used for setting the charging and discharging priorities of each group of batteries in the system according to a preset priority strategy;
and the control unit is used for respectively carrying out charging and discharging processing on each group of batteries according to the priority order according to the corresponding charging and discharging control state which is set in each charging and discharging stage by each group of batteries in advance.
Furthermore, the device also comprises an acquisition unit which is used for respectively acquiring the relevant parameter information of each group of batteries in the system and determining the charging and discharging stage of each group of batteries;
the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
Further, the control unit is specifically adapted to,
according to the preset each group of batteries in each charging and discharging stage,
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
a preset relay is turned on, so that a diode connected in series on a discharge loop is in a broken state, and discharge prohibition is set;
and respectively carrying out charging and discharging treatment on each group of batteries according to the setting and the priority order.
Further, the device also comprises an alarm unit which is used for generating and feeding back alarm information to carry out fuel supplement when the fuel battery pack of the fuel battery is contained in the system and if the fuel stock of the fuel battery is less than a preset alarm threshold value.
Compared with the prior art, the technical scheme of the application comprises the following steps: setting the charging and discharging priority of each group of batteries in the system according to a preset priority strategy; and respectively carrying out charging and discharging treatment on each group of batteries according to the priority order according to the corresponding charging and discharging control states of each group of batteries set in each charging and discharging stage in advance. After the priority of each group of batteries is determined through the priority strategy, the method respectively controls the charging and discharging of each group of batteries according to the corresponding charging and discharging control states of each preset group of batteries at each charging and discharging stage, thereby avoiding the influence on the service life of the batteries due to unreasonable charging and discharging control.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of implementing charge and discharge control in accordance with the present invention;
FIG. 2 is a structural diagram of an apparatus for implementing charge and discharge control according to the present invention;
FIG. 3 is a block diagram of a system according to a fifth embodiment of the present invention;
FIG. 4 is a flow chart of a method of a fifth embodiment of the present invention;
fig. 5 is a flowchart of a method according to a sixth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1 is a flowchart of a method for implementing charge and discharge control according to the present invention, as shown in fig. 1, including:
step 100, setting the charging and discharging priorities of each group of batteries in the system according to a preset priority strategy;
in this step, the preset priority policy is:
and the priority strategy of the charging and discharging sequence of each group of batteries is set according to the charging and discharging speed of the batteries, and/or the freshness and the cost of the batteries, and/or whether the batteries can be charged.
It should be noted that, the charging and discharging sequence can be set according to the charging and discharging speed, and/or the old and new degree, and/or the cost, and/or whether the battery can be charged or not, and can be determined and set according to the experience of the skilled person on the battery performance, cost, service environment, etc.; for the same battery, the parameters may be the same, such as the old and new degree and the cost, and different technicians may perform different priority order settings.
The method also comprises the following steps:
respectively collecting related parameter information of each group of batteries in the system, and determining the charge and discharge stage of each group of batteries; here, the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
Preferably, the related parameter information includes: current value, and/or voltage value, and/or battery temperature.
It is common technical means for those skilled in the art to determine the charge/discharge phase based on the current value, and/or the voltage value, and/or the battery temperature.
The charging and discharging stage comprises:
a charging phase, a full charge phase and a discharging phase.
And 101, respectively carrying out charging and discharging treatment on each group of batteries according to the priority order according to the corresponding charging and discharging control states of each preset group of batteries in each charging and discharging stage.
In this step, the charge and discharge control state is:
charging and discharging are allowed; or,
charge permission and discharge prohibition; or,
charge disabled, discharge enabled; or,
charging is prohibited and discharging is prohibited.
Preferably, the setting of the charge/discharge control state specifically includes:
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
the diode connected in series to the discharge circuit is in an open state by turning on a preset relay, and discharge inhibition is set.
When the system comprises a fuel cell stack, the method further comprises:
when the fuel stock of the fuel cell is less than a preset alarm threshold, alarm information is generated and fed back to perform fuel replenishment.
After the priority of each group of batteries is determined through the priority strategy, the method respectively controls the charging and discharging of each group of batteries according to the corresponding charging and discharging control states of each preset group of batteries at each charging and discharging stage, thereby avoiding the influence on the service life of the batteries due to unreasonable charging and discharging control.
On the other hand, when new and old batteries exist in the system and are used simultaneously, the stability of the system can be improved through reasonable control of charging and discharging.
Fig. 2 is a structural diagram of an apparatus for implementing charge and discharge control according to the present invention, as shown in fig. 2, including:
a priority unit and a control unit; wherein,
the priority unit is used for setting the charging and discharging priorities of each group of batteries in the system according to a preset priority strategy;
and the control unit is used for respectively carrying out charging and discharging processing on each group of batteries according to the priority order according to the corresponding charging and discharging control state which is set in each charging and discharging stage by each group of batteries in advance.
The control unit is specifically adapted to,
according to the preset each group of batteries in each charging and discharging stage,
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
a preset relay is turned on, so that a diode connected in series on a discharge loop is in a broken state, and discharge prohibition is set;
and respectively carrying out charging and discharging treatment on each group of batteries according to the setting and the priority order.
The device also comprises an acquisition unit, a charge-discharge unit and a charge-discharge unit, wherein the acquisition unit is used for respectively acquiring the relevant parameter information of each group of batteries in the system and determining the charge-discharge stage of each group of batteries;
the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
The device also comprises an alarm unit which is used for generating and feeding back alarm information to replenish fuel if the fuel stock of the fuel cell is less than a preset alarm threshold when the system comprises a battery pack of the fuel cell.
The process of the present invention is illustrated in clear detail below by means of specific examples, which are only intended to illustrate the invention and are not intended to limit the scope of the process of the invention.
Example 1
The system of the embodiment comprises a group of quick charge batteries and a group of fuel batteries, and the two groups of batteries are mixed in the working process of the system.
In the embodiment, after reactants such as hydrogen and the like are added according to the mode of acquiring energy by the fuel cell, electric energy is acquired by utilizing chemical reaction and is not chargeable; the quick-charging battery can be charged, so that the quick-charging battery is preferentially used for charging and discharging according to a preset priority strategy; and in combination with the characteristic that the fuel cell is not chargeable, the system only charges the quick-charge battery when charging, and preferentially adopts the quick-charge battery to discharge to realize power supply to the system load when discharging. And only after the quick charge battery finishes discharging and the direct power supply module of the system cannot supply power to the system load, the fuel cell supplies power to the system load.
Specifically, the method comprises the steps of respectively collecting relevant parameter information of each group of batteries in the system, and determining the charging and discharging stage of each group of batteries; here, the relevant parameter information includes a current value, and/or a voltage value, and/or a battery temperature, and the determined charge and discharge phase includes: a charging phase, a full charge phase and a discharging phase.
It should be noted that, various types of batteries are analyzed according to the relevant parameter information, and the charging and discharging stages can be determined through measurement and analysis, which belongs to the common general knowledge of those skilled in the art.
After the setting of the charging and discharging priorities of the battery groups in the system and the judgment of the charging and discharging phases of the batteries are carried out through the above embodiment, the charging and discharging processing is respectively carried out on the battery groups according to the corresponding charging and discharging control states preset for the battery groups in the charging and discharging phases; in particular, the method comprises the following steps of,
in the charging stage, setting the charge-discharge control state of the quick charging battery as follows: charge permission and discharge permission; the charge and discharge control states of the fuel cell are: charge inhibition and discharge inhibition;
further, the air conditioner is provided with a fan,
if the discharge stage of the fast charging battery is switched to the battery charging stage, the charge-discharge control state is carried out through the working state of the charge-discharge loop, specifically,
the charging loop of the quick charging battery keeps conducting;
the discharging loop of the quick charging battery keeps conducting;
the charging circuit of the fuel cell remains open;
the discharge circuit of the fuel cell remains open.
If the discharge stage of the fuel cell is converted into the charge stage of the quick charge cell, the charge-discharge control state is as follows through the working state of the charge-discharge loop:
the discharge circuit of the fuel cell is disconnected;
the charging loop of the quick charging battery is conducted;
the discharge loop of the quick-charging battery is conducted;
the charging circuit of the fuel cell remains open.
Preferably, the switching of the operating states of the charge and discharge circuits is sequentially performed;
here, if the quick charge battery is fully charged, entering a battery full charge stage;
it should be noted that, when the fast charging battery is fully charged, and the charging current of the fast charging battery is detected to be greater than the set charging current threshold according to the related parameter information, the charging loop of the fast charging battery is disconnected, so as to prevent the battery from being overcharged.
In the full-charging stage, the charge and discharge control state of the quick-charging battery is as follows: charge disabled, discharge enabled; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
the working state conversion of the charge and discharge loop is sequentially executed as follows:
disconnecting a charging loop of the quick charging battery; the discharge loop of the quick-charging battery is conducted;
the charging circuit of the fuel cell is disconnected; the discharge circuit of the fuel cell is disconnected.
In the discharging stage, when the direct power supply module cannot supply power to the system load, the system supplies power through the quick charge battery and the fuel cell. The quick-charging battery is discharged to supply power to the system load preferentially; at this moment, in order to ensure that the quick charging battery can be charged at the first time when the direct power supply module recovers power supply, the charging loop of the quick charging battery needs to be converted into charging permission from the charging prohibition at the full charging stage of the battery, and the working state conversion of the charging and discharging loop is sequentially executed:
the charging loop of the quick charging battery is conducted;
the discharging loop of the quick charging battery keeps conducting;
the charging circuit of the fuel cell remains open;
the discharge circuit of the fuel cell remains open;
during the discharging process of the quick charge battery, if the discharging current of the quick charge battery exceeds the set discharging current threshold value according to the relevant parameter information, the discharging loop of the quick charge battery is disconnected, and the discharging loop is converted into the discharging of the fuel battery, so that the over-discharging of the battery is prevented;
when the quick charge battery finishes discharging or over-discharges protection, the power module directly supplying power still cannot supply power to the system load, and the fuel battery is required to discharge to supply power to the load; the working state conversion of the charge and discharge loop is sequentially executed as follows:
disconnecting a charging loop of the quick charging battery;
the discharge loop of the fuel cell is conducted;
disconnecting a discharge loop of the quick charge battery;
the charging circuit of the fuel cell remains open.
Here, the reason why the charging loop of the quick charge battery is switched from on to off is to prevent the fuel cell from charging the quick charge battery;
no matter the battery is in the charging stage, or in the full charge stage and the discharging stage, when the fuel stock such as hydrogen of the fuel battery is less than the preset alarm threshold, the fuel battery sends alarm information to the unit for collecting the relevant parameter information of the battery, and the alarm information of the fuel stock is fed back to the user through the system background so as to add the fuel of the fuel battery; here, the sending of the alarm information may be implemented by wired communication means such as RS232, RS485, CAN, IP, and the like, and wireless communication means such as GPRS, bluetooth, 3G, and the like.
Example 2
The system of the embodiment comprises a group of lead-acid batteries and a group of lithium iron batteries, and the two groups of batteries are mixed in the working process of the system.
According to the characteristic that the lithium iron battery can be charged and discharged with large current, the lithium iron battery is preferentially used for charging and discharging according to the preset priority strategy, namely, the lead-acid battery is charged after the lithium iron battery is fully charged; during discharging, the lithium iron battery is used for discharging preferentially, and the lead-acid battery is used for discharging after the lithium iron battery is discharged.
In this embodiment, the commercial power is used as the direct power supply module of the system (site), if the system can be powered by the commercial power, the commercial power is used for supplying power, otherwise, the lead-acid battery and the lithium iron battery of this embodiment are used for supplying power.
If the mains supply is recovered from the power failure, the capacity of supplying power to the system load and the battery is recovered; namely, the lithium iron battery is switched from a discharging stage to a charging stage due to the recovery of the power supply of the mains supply.
For lead-acid batteries and lithium iron batteries, in the charging stage,
in the charging stage, the charging and discharging control states of the lithium iron battery are set as follows: charging and discharging are allowed; the charge and discharge control state of the lead-acid battery is as follows: charge inhibition, discharge inhibition; after the lithium iron battery is fully charged, if the lead-acid battery is judged not to need to be charged according to the related parameter information, the system directly enters a battery full charging stage; if the lead-acid battery needs to be charged due to the factors of long-term placement, self-discharge and the like, the system charges the lead-acid battery, and the battery is fully charged after the charging is finished;
when the mains supply is recovered from power failure, if the lead-acid battery discharges, the system enters a battery charging stage from a lead-acid battery discharging stage; the discharging priority of the lithium iron battery is higher than that of the lead-acid battery, which indicates that the lithium iron battery is completely discharged at the moment and needs to be charged; according to the charging and discharging priority of each battery group, the lithium iron battery is firstly charged, and then the lead-acid battery is charged. After the lithium iron battery is fully charged, the lithium iron battery is switched to the lead-acid battery for charging, and in order to prevent mutual charging and discharging between the batteries, the working state conversion of the charging and discharging loop is sequentially executed:
disconnecting a charging loop of the lithium iron battery;
conducting a discharging loop of the lead-acid battery;
disconnecting a discharging loop of the lithium iron battery;
and the charging loop of the lead-acid battery is conducted.
In the charging stage of the lead-acid battery, the charging and discharging control state of the lithium iron battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control state of the lead-acid battery is as follows: charging and discharging are allowed;
when the lead-acid battery is fully charged, the battery enters a full charging stage;
when the lead-acid battery is fully charged, the charging current of the lead-acid battery is detected to be larger than the set charging current threshold according to the related parameter information, and then a charging loop of the lead-acid battery is disconnected to prevent the battery from being overcharged.
In the filling stage: after the lead-acid battery is fully charged, the lead-acid battery enters a battery full charging stage, at the moment, the charging and discharging loop of the lithium iron battery is disconnected, the lithium iron battery can be preferentially used, the charging and discharging loop of the lithium iron battery pack needs to be switched, and in order to prevent mutual charging between the batteries, the working state conversion of the charging and discharging loop of each battery pack is sequentially executed:
disconnecting a charging loop of the lead-acid battery;
the discharging loop of the lithium iron battery is conducted;
disconnecting a discharge loop of the lead-acid battery;
and the charging loop of the lithium iron battery is conducted.
Namely, in the full-charge stage of the battery, the charge and discharge control state of the lithium iron battery is as follows: charging and discharging are allowed; the charge and discharge control state of the lead-acid battery is as follows: charging is prohibited and discharging is prohibited.
After the lithium iron battery is fully charged, if the lead-acid battery does not need to be charged according to the detection and judgment of relevant parameter information, the system enters a battery full charging stage, and the working state of the original charging and discharging loop is kept, namely, the charging and discharging control state of the lithium iron battery is as follows: charging and discharging are allowed; the charge and discharge control state of the lead-acid battery is as follows: charge inhibition, discharge inhibition;
when the current battery pack is switched to other battery packs to work in a charge-discharge control state, and abnormal discharge of the fully charged batteries is detected according to the related parameter information, the discharge loop of the batteries in the loop can be disconnected as required, and mutual charging among the battery packs is prevented.
In the discharging stage and the discharging stage of the lithium iron battery, the charging and discharging control state of the lithium iron battery is as follows: charging and discharging are allowed; the charge and discharge control state of the lead-acid battery is as follows: charge inhibition, discharge inhibition;
after the lithium iron battery is discharged, if the commercial power still has no electric energy output, the lead-acid battery continues to discharge, at this time, the lead-acid battery enters a discharging stage, and in order to prevent the batteries from being charged mutually, the working state conversion of the charging and discharging loop is sequentially executed as follows:
disconnecting a charging loop of the lithium iron battery;
conducting a discharging loop of the lead-acid battery;
disconnecting a discharging loop of the lithium iron battery;
the charging loop of the lead-acid battery is conducted;
namely, in the discharging stage of the lead-acid battery, the charging and discharging control states of the lithium iron battery are as follows: charge inhibition, discharge inhibition; the charge and discharge control state of the lead-acid battery is as follows: charging and discharging are allowed;
in the discharging stage, when the discharging current is detected to exceed the set discharging current threshold according to the relevant parameter information, the discharging loop of the battery in the path is disconnected, and the over-discharging of the battery is prevented.
Example 3
The system of the embodiment comprises two groups of rechargeable batteries with the same type and different freshness. The two groups of batteries are mixed in the working process of the system. In this embodiment, since the old and new degrees of the batteries are different, if the same charging coefficient is used for charging, the loss degree of the old battery may be accelerated, so that different charging coefficients are used for the old and new batteries during charging; and if discharged simultaneously, causes the new battery to be worn out too fast, so that the new and old batteries are respectively subjected to respective charging and discharging processes.
The following two cases are included in the charging phase:
in the first case: in the charging stage of the new battery, the charging and discharging control state of the new battery is as follows: charging and discharging are allowed; the charge and discharge control states of the old battery are as follows: charge inhibition, discharge inhibition;
in the second case: after the new battery is fully charged, if the old battery also needs to be charged, the charging stage of the old battery is entered, when the current battery pack is switched to other battery packs to work in a charging and discharging control state, in order to prevent the batteries from being charged mutually, the working state conversion of the charging and discharging loop of each battery is sequentially executed as:
the charging circuit of the new battery is disconnected;
the discharging loop of the old battery is conducted;
the discharging loop of the new battery is disconnected;
the charging loop of the old battery is conducted.
That is, in the charging stage of the old battery, the charging and discharging control states of the new battery are as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the old battery are as follows: charging and discharging are allowed;
after the new battery is fully charged, if the old battery does not need to be charged, the battery fully charging stage is directly started;
after the old battery is fully charged, entering a battery full charging stage;
in the charging stage of the battery, when the charging current of the new battery or the old battery is detected to be larger than the set charging current threshold according to the related parameter information, the charging loop of the breaker is disconnected, and the overcharge of the battery is prevented.
In the filling phase, two situations are involved:
in the first case: after the new battery is fully charged, if the old battery does not need to be charged, the battery full charging stage is entered, and the charge and discharge control state is kept unchanged, namely, the charge and discharge control state of the new battery is as follows: charging and discharging are allowed; the charge and discharge control states of the old battery are as follows: charge inhibition, discharge inhibition;
in the second case: after the old battery is fully charged, the battery full charging stage is started, the charging and discharging loops of the new battery are all disconnected, the charging and discharging control state conversion of the battery is needed to be carried out in order to enable the new battery to be preferentially used, and the working state conversion of the charging and discharging loops of each group of batteries is sequentially executed in order to prevent the batteries from being charged with each other:
the charging loop of the old battery is disconnected;
the discharging loop of the new battery is conducted;
the discharging loop of the old battery is disconnected;
the charging loop of the new battery is turned on.
That is, in the full-charge stage of the battery, the charge and discharge control state of the new battery is as follows: charging and discharging are allowed; the charge and discharge control states of the old battery are as follows: charge inhibition, discharge inhibition;
when the current battery pack is switched to other battery packs to work in a charge-discharge control state, and abnormal discharge of the fully charged batteries is detected according to the related parameter information, the discharge loop of the batteries can be disconnected as required, and mutual charge among the batteries is prevented.
And (3) a discharging stage: the new battery and the old battery are respectively discharged to supply power to the load; in order to fully develop the battery performance, the discharge priority of the new battery is higher than that of the old battery.
In the discharging stage of the new battery, the charge and discharge control state of the new battery is as follows: charging and discharging are allowed; the charge and discharge control states of the old battery are as follows: charging is prohibited and discharging is prohibited.
After the new battery is discharged, if the direct power supply module still has no electric energy output, the old battery continues to discharge, at this time, the old battery enters the discharging stage, when the current battery pack is switched to other battery packs to work in the charging and discharging control state, in order to prevent the batteries from being charged mutually, the working state conversion of the charging and discharging loop of the new battery and the old battery is implemented according to the sequence:
the charging circuit of the new battery is disconnected;
the discharging loop of the old battery is conducted;
the discharging loop of the new battery is disconnected;
the charging loop of the old battery is conducted.
That is, in the discharge stage of the old battery, the charge and discharge control states of the new battery are: charge inhibition, discharge inhibition; the charge and discharge control states of the old battery are as follows: charging and discharging are allowed;
and in the discharging stage of the new battery and the old battery, if the discharging current of the quick-charge battery exceeds the set discharging current threshold value according to the relevant parameter information, the discharging loop of the quick-charge battery is disconnected, and the over-discharge of the battery is prevented.
Example 4
The system of the embodiment comprises a group of fuel cells, a group of new lead-acid cells and a group of old lead-acid cells, and the three groups of cells are mixed in the working process of the system.
In this embodiment, the new lead-acid battery and the old lead-acid battery adopt different charging coefficients, and the lead-acid battery is preferentially used during discharging, and the fuel battery is finally considered for discharging, and the specific process is as follows:
the charging phase includes two cases:
in the first case: in the charging stage of the new lead-acid battery, the charge and discharge control state of the new lead-acid battery is as follows: charging and discharging are allowed; the charging and discharging control states of the old lead-acid battery are as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
in the second case: after the new lead-acid battery is fully charged, if the old lead-acid battery also needs to be charged, entering the charging stage of the old lead-acid battery, and when the current battery pack is switched to other battery packs to work in a charging and discharging control state, the working state conversion of the charging and discharging loops of the battery packs is sequentially executed as follows:
disconnecting the charging loop of the new lead-acid battery;
the discharge loop of the old lead-acid battery is conducted;
disconnecting a discharge loop of the new lead-acid battery;
the charging loop of the old lead-acid battery is conducted;
the charge-discharge loop of the fuel cell is kept unchanged;
namely, in the charging stage of the old lead-acid battery, the charging and discharging control states of the old lead-acid battery are as follows: charging and discharging are allowed; the charge and discharge control state of the novel lead-acid battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
after the new lead-acid battery is fully charged, if the old lead-acid battery does not need to be charged, the battery is directly charged; otherwise, after the old lead-acid battery is fully charged, entering a battery full charging stage;
if the system is switched from the discharge stage of the fuel cell to the charge stage of the new lead-acid cell, the working state switching of the charge-discharge loop of each group of cells is sequentially executed as:
conducting a discharge loop of the new lead-acid battery;
the discharge circuit of the fuel cell is disconnected;
the charging loop of the new lead-acid battery is conducted;
the charging circuit of the fuel cell remains open;
the state of the charging and discharging control unit of the old lead-acid battery is kept unchanged.
In the charging stage of the battery, when the charging current of the battery is detected to be larger than the set charging current threshold according to the related parameter information, a charging loop of the lead-acid battery is disconnected, and the overcharge of the battery is prevented.
The filling phase involves two cases:
in the first case: after the new lead-acid battery is fully charged, if the old lead-acid battery does not need to be charged, entering a battery full charging stage, wherein the charging and discharging loops of the old lead-acid battery are all disconnected, and the charging and discharging loops of the fuel battery are all disconnected; in order to fully exert the performance of the new lead-acid battery, the new lead-acid battery is preferentially used, and the charge-discharge control state of the new lead-acid battery is kept unchanged;
namely, in the full-charge stage of the battery, the charge and discharge control state of the new lead-acid battery is as follows: charging and discharging are allowed; the charge and discharge control state of the old lead-acid battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
in the second case: after the old lead-acid battery is fully charged, entering a battery full charging stage, wherein the charging and discharging loops of the new lead-acid battery are disconnected, and the charging and discharging loops of the fuel battery are disconnected; in order to fully exert the performance of the new lead-acid battery, the new lead-acid battery is preferentially used, the charging and discharging control state conversion of the battery is required, and in order to prevent mutual charging between the batteries, the operation state conversion of the charging and discharging loop of each battery group is sequentially executed as follows:
disconnecting a charging loop of the old lead-acid battery;
conducting a discharge loop of the new lead-acid battery;
disconnecting a discharge loop of the old lead-acid battery;
the charging loop of the new lead-acid battery is conducted;
the charge-discharge control state of the fuel cell is kept unchanged;
namely, in the full-charge stage of the battery, the charge and discharge control state of the new lead-acid battery is as follows: charging and discharging are allowed; the charge and discharge control state of the old lead-acid battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
when the charging and discharging control state of the battery is switched, and the abnormal discharging condition of the fully charged battery is detected according to the related parameter information, the discharging loop of the battery can be disconnected according to the requirement, so that the mutual charging among all the battery groups is prevented.
The discharge phase comprises three cases:
in the first case: in the discharging stage of the new lead-acid battery, the charging and discharging control state of the new lead-acid battery is as follows: charging and discharging are allowed; the charge and discharge control state of the old lead-acid battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
in the second case: after the new lead-acid battery is discharged, if the power module directly supplying power still has no electric energy output, the old lead-acid battery continues to discharge, at this time, the discharge stage of the new lead-acid battery needs to be switched to the discharge stage of the old lead-acid battery, when the current battery pack is switched to other battery packs to work in a charge-discharge control state, in order to prevent the batteries from being charged mutually, the working state switching of the charge-discharge loops of the batteries of each group is implemented according to the sequence:
disconnecting the charging loop of the new lead-acid battery;
the discharge loop of the old lead-acid battery is conducted;
disconnecting a discharge loop of the new lead-acid battery;
the discharge loop of the old lead-acid battery is conducted;
the charge-discharge control state of the fuel cell remains unchanged;
namely, in the discharging stage of the old lead-acid battery, the charging and discharging control states of the new lead-acid battery are as follows: charge inhibition, discharge inhibition; the charge and discharge control state of the old lead-acid battery is as follows: charging and discharging are allowed; the charge and discharge control states of the fuel cell are: charge inhibition, discharge inhibition;
in the discharging stage, when the discharging current is detected to exceed the set discharging current threshold according to the relevant parameter information, the discharging loop of the battery in the path is disconnected, and the over-discharging of the battery is prevented.
In the third case: if the old lead-acid battery is discharged, if the power module directly supplying power still has no energy output, the fuel battery continues to discharge, at this time, the discharge stage of the old lead-acid battery needs to be switched to the discharge stage of the fuel battery, when the charge-discharge control state is switched, in order to prevent the batteries from being charged mutually, the working state switching of the charge-discharge loops of each group of batteries is executed according to the sequence:
disconnecting a charging loop of the old lead-acid battery;
the discharge circuit of the fuel cell (system) is conducted;
disconnecting a discharge loop of the old lead-acid battery;
the charging circuit of the fuel cell remains open;
the charge control state of the new lead-acid battery is kept unchanged;
that is, in the discharge stage of the fuel cell, the charge/discharge control state of the fuel cell is: charge disabled, discharge enabled; the charge and discharge control state of the novel lead-acid battery is as follows: charge inhibition, discharge inhibition; the charge and discharge control state of the old lead-acid battery is as follows: charging is prohibited and discharging is prohibited.
In order to illustrate the operation state transition process of the battery charging circuit and the battery discharging circuit, the invention is described in detail in the following by the embodiment 5 and the embodiment 6.
Example 5
Fig. 3 is a block diagram of a system structure according to a fifth embodiment of the present invention, and as shown in fig. 3, the system includes a power module for directly supplying power, two sets of batteries, a system load, and a detection circuit, where one set of batteries is a fast charging battery, and the other set of batteries is a fuel battery, and the fast charging battery and the fuel battery are connected in series with the system load, and are respectively connected with two diodes and two relays for controlling states of charge prohibition, charge permission, discharge permission, and discharge prohibition.
In this embodiment, when the power module directly supplies power, the power module directly supplies power to the system load, fig. 4 is a flowchart of a method according to a fifth embodiment of the present invention, and as shown in fig. 4, a charging process for a fast charging battery includes:
step 400, determining whether to convert a charging stage from a discharging process of the fuel cell according to the charging and discharging control states of the fuel cell and the quick-charging cell; specifically, whether the fuel cell is discharged and converted before the quick charge battery is charged is judged according to the related parameter information of the fuel cell and the quick charge battery, if not, the step 401 is carried out, and whether the quick charge battery needs to be charged is judged; if yes, indicating that the quick charge battery is completely discharged, and entering step 402;
step 401, judging whether the quick charge battery needs to be charged; if charging is required, go to step 402; otherwise, ending the charging process.
Step 402, disconnecting a fuel cell discharging loop and connecting a quick charge battery charging loop; taking the circuit of fig. 3 as an example, assuming that the battery pack 1 in fig. 3 is a fast charge battery and the battery pack 2 is a fuel cell, the relay K of the fuel cell discharging circuit is turned offD2Relay K for closing charging loop of quick-charging batteryC1The conduction of the charging loop of the quick charging battery is realized, and meanwhile, the fuel battery is prevented from charging the quick charging battery.
Step 403, turning on a discharge loop of the quick charge battery, and keeping a charge loop of the fuel battery disconnected; relay K for closing charging loop of quick-charging batteryD1Here, the relay K is closedD1The discharging loop of the quick-charging battery can be in a discharging permission state (a pre-conduction state), and the quick-charging battery can be immediately charged when the power module directly supplying power recovers to supply power; ensuring fuel cell charging circuit KC2Off, the fuel cell does not need to be charged.
And step 404, charging is completed when the quick charge battery is judged to be fully charged according to the battery related parameter information of the quick charge battery.
It should be noted that, in the charging process of the fast charging battery, in order to ensure that the system does not power down when the power supply module cannot supply power, the discharging loop of the fast charging battery is always in the state of allowing discharging.
Example 6
In this embodiment, two groups of batteries are respectively a fast charge battery and a fuel battery, which are taken as an example to clearly and specifically describe the discharging process of the fast charge battery and the fuel battery, and when the power module directly supplying power cannot supply power to the system load, the fast charge battery and the fuel battery supply power to the system load. Fig. 5 is a flowchart of a method according to a sixth embodiment of the present invention, as shown in fig. 5, including:
500, when the power supply module directly supplying power supplies power to the system load, conducting a discharging loop and a charging loop of the quick-charging battery, and when the power supply module directly supplying power is powered off, using the quick-charging battery to supply power to the system load; taking the circuit of fig. 3, the battery 1 is a fast charging battery and the battery 2 is a fuel cell as an example, the relay K is turned offD1The relay K of the charging loop of the quick-charging battery can charge the quick-charging battery for the first time when the power module for direct power supply recovers power supplyC1Keeping a closed state;
after step 500 is executed, the control of the charge and discharge control state of the fuel cell is sequentially executed;
step 501, the discharging loop and the charging loop of the fuel cell are kept disconnected; in order to prevent mutual charging between batteries in the charging process of the quick-charging battery, a discharging loop of the fuel battery is kept disconnected, the fuel battery does not need to be charged, and a charging loop is kept disconnected;
step 502, in the discharging process of the quick-charging battery, judging whether the power module directly supplying power recovers power supply, if so, ending the discharging stage of the quick-charging battery; otherwise, go to step 503 to judge the completion of discharging;
step 503, judging whether the quick charge battery is completely discharged or not according to the relevant parameter information of the battery, namely whether the quick charge battery reaches a discharge voltage threshold or not, if not, continuing to discharge, and meanwhile, continuously determining whether the power supply module directly supplying power in the step 502 recovers power supply or not; when the discharge voltage threshold is reached, switching to the discharge phase 504 of the fuel cell;
step 504, switching to a discharge phase of the fuel cell; specifically, the charging circuit of the quick charge battery is disconnected, the discharging circuit of the fuel battery is conducted, the discharging circuit of the quick charge battery is disconnected, and the charging circuit of the fuel battery is kept disconnected; specifically, a charge circuit relay K for a fast-charging batteryC1Disconnecting to prevent the fuel cell from charging the quick charge battery; relay K for closing fuel cell discharge circuitD2(ii) a Relay K for disconnecting discharge loop of quick-charging batteryD1Relay K for disconnecting fuel cell charging circuitC2Preventing the quick-charging battery from over-discharging;
505, when the fuel cell discharges, judging that the power supply module directly supplying power recovers power supply, and ending the discharging stage; if the directly powered power module does not resume power, go to step 506;
step 506, judging whether the discharge of the fuel cell is finished; when the discharging is not completed, step 505 is executed while discharging; when the discharging is completed, step 507 is executed;
and step 507, ending the discharge of the fuel cell.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A method for realizing charge and discharge control is characterized by comprising the following steps:
setting the charging and discharging priority of each group of batteries in the system according to a preset priority strategy;
and respectively carrying out charging and discharging treatment on each group of batteries according to the priority order according to the corresponding charging and discharging control states of each group of batteries set in each charging and discharging stage in advance.
2. The method of claim 1, further comprising, prior to the method;
respectively collecting related parameter information of each group of batteries in the system, and determining the charge and discharge stage of each group of batteries;
the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
3. The method according to claim 1 or 2, wherein the preset priority policy is:
and the priority strategy of the charging and discharging sequence of each group of batteries is set according to the charging and discharging speed of the batteries, and/or the freshness and the cost of the batteries, and/or whether the batteries can be charged.
4. The method of claim 2, wherein the related parameter information comprises: current value, and/or voltage value, and/or battery temperature.
5. The method of claim 4, wherein the charging and discharging phase comprises:
a charging phase, a full charge phase and a discharging phase.
6. Method according to claim 1 or 2, characterized in that the charge-discharge control state is:
charging and discharging are allowed; or,
charge permission and discharge prohibition; or,
charge disabled, discharge enabled; or,
charging is prohibited and discharging is prohibited.
7. The method according to claim 6, wherein the setting of the charge-discharge control state specifically comprises:
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
the diode connected in series to the discharge circuit is in an open state by turning on a preset relay, and discharge inhibition is set.
8. The method of claim 1 or 2, wherein when the system comprises a stack of fuel cells, the method further comprises:
when the fuel stock of the fuel cell is less than a preset alarm threshold, alarm information is generated and fed back to perform fuel replenishment.
9. An apparatus for implementing charge and discharge control, comprising: a priority unit and a control unit; wherein,
the priority unit is used for setting the charging and discharging priorities of each group of batteries in the system according to a preset priority strategy;
and the control unit is used for respectively carrying out charging and discharging processing on each group of batteries according to the priority order according to the corresponding charging and discharging control state which is set in each charging and discharging stage by each group of batteries in advance.
10. The device of claim 9, further comprising an acquisition unit for respectively acquiring the relevant parameter information of each battery in the system and determining the charging and discharging stage of each battery;
the battery includes: the batteries of different types and the batteries of different old and new degrees are charged.
11. The device according to claim 9 or 10, characterized in that the control unit is specifically adapted to,
according to the preset each group of batteries in each charging and discharging stage,
by closing a preset relay, a diode connected in series on a charging loop is in a forward conduction state, and charging permission is set;
the method comprises the steps that a preset relay is turned on, so that a diode connected in series on a charging loop is in an open circuit state, and charging prohibition is set;
by closing a preset relay, a diode connected in series on a discharge loop is in a forward conduction state, and discharge permission is set;
a preset relay is turned on, so that a diode connected in series on a discharge loop is in a broken state, and discharge prohibition is set;
and respectively carrying out charging and discharging treatment on each group of batteries according to the setting and the priority order.
12. The apparatus according to claim 9 or 10, further comprising an alarm unit for generating and feeding back an alarm message for refueling if a fuel stock of the fuel cell is less than a preset alarm threshold when a stack of fuel cells is included in the system.
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| CN201510489907.3A CN106451582A (en) | 2015-08-11 | 2015-08-11 | Method and apparatus to control the power charge and power discharge |
| PCT/CN2016/085152 WO2017024883A1 (en) | 2015-08-11 | 2016-06-07 | Method and apparatus for implementing charge and discharge control |
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| CN201510489907.3A CN106451582A (en) | 2015-08-11 | 2015-08-11 | Method and apparatus to control the power charge and power discharge |
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| WO2018233556A1 (en) * | 2017-06-23 | 2018-12-27 | 中兴通讯股份有限公司 | Power monitoring system, communication device |
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| CN110535208A (en) * | 2019-09-11 | 2019-12-03 | 杭州协能科技股份有限公司 | The major loop control circuit of energy storage device |
| CN113489106B (en) * | 2021-07-16 | 2022-10-21 | 同济大学 | Fuel cell and lithium cell hybrid control method and system for offshore platform |
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| WO2017024883A1 (en) | 2017-02-16 |
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Application publication date: 20170222 |