CN108923088B - Device and method for improving discharge capacity of storage battery - Google Patents
Device and method for improving discharge capacity of storage battery Download PDFInfo
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- CN108923088B CN108923088B CN201810913745.5A CN201810913745A CN108923088B CN 108923088 B CN108923088 B CN 108923088B CN 201810913745 A CN201810913745 A CN 201810913745A CN 108923088 B CN108923088 B CN 108923088B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a device and a method for improving the discharge capacity of a storage battery. The working battery pack includes a plurality of working battery cells. The energy accumulator comprises an energy accumulator group and a potential booster. A bidirectional electronic switch is associated with each working battery unit. The controller realizes the change of the charging and discharging state of the working battery unit by controlling the charging and discharging switching state of the bidirectional electronic switch. The controller sends out cyclic shift charging signals to the bidirectional electronic switches to realize that the energy continuing device charges the working battery units in turn one by one, and at least one working battery unit is charged each time, but each non-charged working battery unit discharges to the load. The charged working battery cells are charged by receiving the charging voltage, and the discharged working battery cells are discharged from the discharge output interface to the load. The invention effectively prolongs the discharge time and improves the discharge capacity of the storage battery on the premise of not changing the original capacity of the battery.
Description
Technical Field
The invention relates to a device for improving the discharge capacity of a storage battery and a method for improving the discharge capacity of the storage battery based on the device, and belongs to the technical field of improvement of the discharge capacity of the storage battery.
Background
The storage batteries, namely, the storage batteries, which are common in the market at present, mainly comprise lead-acid storage batteries, lithium ion batteries and the like, are widely applied to various energy storage, energy saving and clean energy systems and various electric devices, the capacities and the energy densities of the storage batteries are different, but the storage batteries are very limited, so that the application of the storage batteries in the energy field is greatly limited, and particularly in the field with higher requirements on the discharge capacity or the energy density of the storage batteries, the discharge performance of the storage batteries is far different from the actual use requirements, and the problem is obvious.
The storage battery is an important basic energy component in various electrical devices and equipment, and the defects of weak discharge capacity, low energy density, high cost and the like of the existing storage battery become serious obstacles for limiting the technical progress of the energy industry, so that how to further optimize and improve the discharge performance of the existing storage battery and improve the discharge capacity of the existing storage battery is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a device and a method for improving the discharge capacity of a storage battery, which adopt a mode that working battery units in a working battery pack are charged in turn one by one, and the non-charged working battery units discharge external loads, thereby effectively improving the discharge capacity of the storage battery on the premise of not changing the original capacity of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a battery discharge capacity hoisting device which characterized in that: it includes work group battery, continuation of energy ware, controller and two-way electronic switch, wherein: the working battery pack comprises a plurality of working battery units; the energy accumulator comprises an energy accumulator group and a potential booster; the energy-continuing battery pack supplies power to the potential booster and is connected with the potential booster in series to output a charging voltage higher than the voltage of the working battery cell terminal to the working battery pack; each working battery unit is provided with a bidirectional electronic switch, and the controller realizes the change of the charging and discharging states of the working battery units by controlling the charging and discharging switching states of the bidirectional electronic switch; the controller sends out cyclic shift charging signals to the bidirectional electronic switches to realize that the energy continuing device charges the working battery units in turn one by one, at least one working battery unit is charged each time, and the non-charged working battery units are discharged to the load, wherein the charged working battery units are connected in parallel through the bidirectional electronic switches and then receive charging voltage for charging, and the discharged working battery units are connected in parallel through the bidirectional electronic switches and then are discharged to the load from the discharging output interface.
A method for improving the discharge capacity of a storage battery based on the device for improving the discharge capacity of the storage battery is characterized by comprising the following steps:
1) judging whether the terminal voltage of the energy-continuing battery pack is equal to or less than the terminal voltage of the working battery pack, or whether the terminal voltage of the energy-continuing battery pack reaches a lower threshold value although the terminal voltage of the energy-continuing battery pack is greater than the terminal voltage of the working battery pack and cannot be compensated by charging of the energy-continuing battery pack: if so, stopping the energy charger to charge each working battery unit in turn; if not, turning to 2);
2) if the electric energy of the working battery pack is reduced, the energy charging device is enabled to charge the working battery units of the working battery pack in turn one by one based on the control of the controller on the charging and discharging switching state of the bidirectional electronic switch, and during each charging:
the controller sends a charging instruction to at least one bidirectional electronic switch and a discharging instruction to other bidirectional electronic switches, the bidirectional electronic switch receiving the charging instruction is switched to a charging mode to enable the energy accumulator to charge the working battery unit connected with the bidirectional electronic switch switched to the charging mode, and the bidirectional electronic switch receiving the discharging instruction is switched to a discharging mode to enable the working battery unit connected with the bidirectional electronic switch switched to the discharging mode to discharge to a load;
3) return 1).
The invention has the advantages that:
the invention thoroughly changes the use modes of charging, discharging and charging which are used by the storage battery all the time, adopts a successive alternate charging mode for the working battery units in the working battery pack, realizes the online recovery and supplement of the electric energy of each working battery unit on the basis of not influencing the discharging effect of the whole working battery pack on an external load, simultaneously achieves the purposes of improving the discharging capability of the working battery pack and uninterruptedly discharging outwards, effectively inhibits the adverse effect generated in the storage battery during continuous discharging by using smaller power on the premise of not changing the original capacity of the battery, greatly improves the environment and the working condition of the electrochemical reaction of the storage battery in the charging and discharging process, fully excavates the discharging potential energy of the working battery pack, and obviously improves the equivalent capacity and the energy density of the storage battery.
Drawings
Fig. 1 is a schematic view of a device for improving the discharge capacity of a battery according to a preferred embodiment of the present invention.
Detailed Description
As shown in fig. 1, the device for improving the discharging capability of a storage battery according to the present invention comprises a working battery pack 20, a charger 10, a controller 40, and a bidirectional electronic switch 50, wherein: the working battery pack 20 includes a plurality of working battery cells, such as working battery cells B1 to Bn shown in fig. 1 (n is a positive integer of 1 or more); the energy accumulator 10 comprises an energy accumulator group 11 and a potential raiser 12; the energy-continuing battery pack 11 supplies power to the potential booster 12 and is connected in series with the potential booster 12 to output a charging voltage higher than the voltage of the working battery unit to the working battery pack 20 (it can be regarded that the potential booster 12 carries out potential boosting processing on the energy-continuing battery pack 11), namely the charging voltage output by the energy-continuing battery pack 10 is the sum of the voltage of the terminal of the energy-continuing battery pack 11 and the voltage obtained after internal transformation of the potential booster 12; each working battery unit is provided with a bidirectional electronic switch 50, and the controller 40 realizes the change of the charging and discharging states of the working battery units by controlling the charging and discharging switching states of the bidirectional electronic switch 50; the controller 40 sends out a cyclic shift charging signal to each bidirectional electronic switch 50 to realize that the energy relay 10 charges the working battery units one by turns, and each non-charged working battery unit charges at least one working battery unit to an external load (not shown in the figure), wherein each charged working battery unit is connected in parallel through each corresponding bidirectional electronic switch 50 and then receives a charging voltage for charging, and each discharged working battery unit is connected in parallel through each corresponding bidirectional electronic switch 50 and then discharges to the load from the discharging output interface 80.
In the actual design, as shown in the figure, the cathodes of all the working battery cells are grounded, and the anodes of the working battery cells are independent of each other and are respectively connected to the battery connection terminal (pin 3 shown in fig. 1) of the corresponding bidirectional electronic switch 50. The rechargeable battery pack 11 includes several rechargeable battery cells, such as rechargeable battery cells a1 to Am shown in fig. 1 (m is a positive integer equal to or greater than 1). The negative poles of all the energy-continuing battery units are grounded, the positive poles of all the energy-continuing battery units are divided into two paths, one path is connected with the positive pole of the input side of the potential booster 12, the negative pole of the input side of the potential booster 12 is grounded, and the other path is connected with the negative pole of the output side of the potential booster 12. The positive electrode of the output side of the level booster 12 is used to output a charging voltage and is connected to the charging terminal (pin 1 shown in fig. 1) of each bidirectional electronic switch 50, the discharging terminal (pin 2 shown in fig. 1) of each bidirectional electronic switch 50 is connected to the discharging output interface 80, the discharging output interface 80 is used to connect to a load, and the charging and discharging control terminal (pin 4 shown in fig. 1) of each bidirectional electronic switch 50 is connected to the corresponding charging and discharging control signal output terminal of the controller 40 (the charging and discharging control signal output terminals of the controller 40 are connected to the ports P1 to Pn shown in fig. 1).
In the present invention, the controller 40 includes a microprocessor 41 or a control unit constituted by other digitizing circuits.
In the present invention, the working cell unit is constituted by one storage battery or a plurality of storage batteries of the same capacity connected in series. The energy-sustaining cell unit is composed of one storage battery, or is composed of a plurality of storage batteries with the same capacity in series connection, or is composed of a plurality of storage batteries in series-parallel connection in a series-parallel connection mode.
In the present invention, the operating battery pack 20 and the rechargeable battery pack 11 are independent of each other. Further, the capacities and specifications of the respective storage batteries in the working battery cells are the same, and similarly, the capacities and specifications of the respective storage batteries in the rechargeable battery cells are the same, and the negative electrodes of the respective working battery cells are common to the negative electrodes of the respective rechargeable battery cells.
In the present invention, the level-raising device 12 is an existing mature electronic component such as an isolated voltage-adjustable DC/DC converter, an isolated voltage-stabilized power supply, or a battery pack. An isolated voltage-regulated DC/DC converter is a voltage regulation device with an input side isolated from an output side, which is well known in the art. When the isolated voltage-adjustable DC/DC converter is selected, the balance voltage of the working battery unit is designed to be equal to that of the energy-sustaining battery unit.
In practical design, the bidirectional electronic switch 50 includes a charging electronic switch and a discharging electronic switch, one end of the charging electronic switch is connected to the positive electrode of the output side of the potential booster 12, the other end of the charging electronic switch is divided into two paths, one path is connected to the positive electrode of a corresponding working battery unit, the other path is connected to one end of the discharging electronic switch, the other end of the discharging electronic switch is connected to the discharging output interface 80, the switch control ends of the charging electronic switch and the discharging electronic switch are connected to the same corresponding charging and discharging control signal output end of the controller 40, and an inverter F is connected between any one of the charging electronic switch and the discharging electronic switch and the charging and discharging control signal output end of the controller 40, so that the states of the charging electronic switch and the discharging electronic switch are reversed, and the charging electronic switch and the discharging electronic switch are alternately turned on and off, specifically, when the charging, the discharging electronic switches in the same path are turned off at the same time, and when the discharging electronic switches are turned on, the charging electronic switches in the same path are turned off at the same time.
As in fig. 1, further, the charging electronic switch includes a charging switch transistor Kc1, and the discharging electronic switch includes a discharging switch transistor Kd1, wherein: the charge switch transistor Kc1 and the discharge switch transistor Kd1 are connected in a half bridge, that is, the drain of the charge switch transistor Kc1 is the charge terminal of the bidirectional electronic switch 50, the source thereof is connected to the drain of the discharge switch transistor Kd1, the source of the discharge switch transistor Kd1 is the discharge terminal of the bidirectional electronic switch 50, the common connection terminal of the charge switch transistor Kc1 and the discharge switch transistor Kd1 is connected to the positive electrode of a corresponding operating battery cell, the gates of the charge switch transistor Kc1 and the discharge switch transistor Kd1 are connected to respective driving circuits, and are controlled by the respective driving circuits, and the respective driving circuits are connected to the controller 40, specifically, one driving circuit is directly connected to the controller 40, and the other driving circuit is connected to the controller 40 via the inverter F, that is, the driving signals received by the charge switch transistor and the discharge switch transistor are in opposite phase.
As shown in fig. 1, the driving circuit includes a transistor and a resistor-capacitor element, wherein: the driving circuit connected to the charge switching transistor Kc1 includes a transistor Q1, and the driving circuit connected to the discharge switching transistor Kd1 includes a transistor Q2.
In the present invention, the charge switch transistor Kc1 and the discharge switch transistor Kd1 may be active switching devices such as bipolar transistors, field effect transistors, or IGBT transistors (i.e., insulated gate bipolar transistors), and if the voltage drop of the charge and discharge electronic switches is required to be extremely small or even zero, an electromagnetic relay with a transfer contact may also be used.
As shown in fig. 1, the battery discharging capability improving apparatus of the present invention further includes a process parameter detector 30, wherein: the process parameter detector 30 includes a charging current sensor 31 connected between the positive electrode of the output side of the level booster 12 and the charging terminal of each of the bidirectional electronic switches 50 for detecting a charging current, and a discharging current sensor 32 connected between the discharging terminal of each of the bidirectional electronic switches 50 and the discharging output interface 80 for detecting a discharging current, wherein a detection signal output terminal of the charging current sensor 31 is connected to a corresponding a/D conversion signal terminal of the controller 40 via a first amplifying circuit 33, and a detection signal output terminal of the discharging current sensor 32 is connected to a corresponding a/D conversion signal terminal of the controller 40 via a second amplifying circuit 34.
In practical design, the first amplifying circuit 33 includes an op amp U1, and the second amplifying circuit 34 includes an op amp U2. The charging current sensor 31 and the discharging current sensor 32 are current sensors, and the first amplifier circuit 33 and the second amplifier circuit 34 are common operational amplifier circuits, which are well-known devices or circuits in the art and therefore will not be described in detail here.
As shown in fig. 1, the positive electrode of the energy-continuing battery pack 11 (i.e. the positive electrode of each energy-continuing battery cell), the positive electrode of the working battery pack 20 (i.e. the positive electrode of each working battery cell, which may be designed as the discharging terminal of each bidirectional electronic switch 50 in practical implementation) are connected to the corresponding a/D conversion signal terminal of the controller 40, and the start-stop control terminal and the charging voltage regulation control terminal of the electric potential booster 12 are respectively connected to the corresponding control signal output terminals of the controller 40.
In practical implementation, when the requirement of the device of the present invention on the control of the charging parameters is not high, the discharging current sensor 32 and the second amplifying circuit 34 can be omitted.
In practical design, the device for improving the discharging capability of the storage battery further comprises a battery combination mode switch 90, wherein the positive electrode of the energy-sustaining battery pack 11, the positive electrode of the input side of the potential booster 12 and the discharging output interface 80 are respectively connected with corresponding switching connection ends of the battery combination mode switch 90, and a switching control end of the battery combination mode switch 90 is connected with a corresponding control signal output end of the controller 40, wherein:
it is determined whether the terminal voltage of the continued energy battery pack 11 is equal to or less than the terminal voltage of the operating battery pack, or whether the terminal voltage of the operating battery pack reaches the lower threshold value although the terminal voltage of the continued energy battery pack 11 is greater than the terminal voltage of the operating battery pack and cannot be compensated by the charging of the continued energy battery pack 11: if so, the positive electrode of the rechargeable battery pack 11 is conducted with the discharge output interface 80 through the battery combination mode switch 90, so that the rechargeable battery pack 11 and the working battery pack discharge the load together (at this time, the working battery pack is not charged in turn), otherwise, the positive electrode of the rechargeable battery pack 11 is conducted with the positive electrode of the input side of the potential booster 12 through the battery combination mode switch 90, so that the rechargeable battery pack 11 supplies power to the potential booster 12, and the working battery units are charged in turn by the rechargeable battery 10.
Referring to fig. 1, a preferred structure of the battery pack mode changeover switch 90 is shown, and the battery pack mode changeover switch 90 includes a relay including a changeover switch J-1 and a coil J, wherein: the static contact of the change-over switch J-1 is connected with the positive pole of the energy-continuing battery pack 11, the normally closed movable contact of the change-over switch J-1 is connected with the positive pole of the input side of the potential raiser 12, the normally open movable contact of the change-over switch J-1 is connected with the discharge output interface 80, one end of the coil J is connected with the power supply, and the other end is connected with the corresponding control signal output end of the controller 40 through the triode Q and the resistor.
In actual operation, if the operating battery pack 20 is discharged to cause the terminal voltage thereof to decrease, and the terminal voltage of the continuous energy battery pack 11 is higher than the terminal voltage of the operating battery pack, at this time, the controller 40 does not send a switching instruction to the battery combination mode switch 90, so that the triode Q is turned off, the coil J is not energized, the stationary contact 1 and the normally closed movable contact 2 are kept closed, the continuous energy battery pack 11 supplies power to the potential booster 12, and at the same time, the controller 40 controls the charging and discharging states of the bidirectional electronic switches 50, and the energy charger 10 performs a successive alternate charging process on the operating battery pack 20.
The controller 40 will issue a switching command to the battery combination mode switch 90 when any one of the following conditions occurs:
1. the terminal voltage of the recharging battery pack 11 is equal to or less than the terminal voltage of the working battery pack;
2. although the terminal voltage of the rechargeable battery pack 11 is greater than the terminal voltage of the working battery pack, the terminal voltage of the working battery pack reaches a set lower limit threshold and cannot be compensated by charging of the rechargeable battery pack 11;
after receiving the switching instruction, the triode Q is conducted to electrify the coil J, the transfer switch J-1 acts, the stationary contact 1 is disconnected from the normally closed movable contact 2, the stationary contact 1 is connected with the normally open movable contact 3, the energy-continuing battery pack 11 stops supplying power to the potential booster 12, the anode of the energy-continuing battery pack 11 is connected with the discharge output interface 80, the energy-continuing battery pack 11 and the working battery pack 20 discharge to the load together, meanwhile, the controller 40 sends a discharge instruction to all the bidirectional electronic switches 50 to stop the successive alternate charging process, and all the working battery packs are in a discharge state.
In practical design, the positive electrode of the rechargeable battery pack 11, i.e., the positive electrode of each rechargeable battery unit, is subjected to voltage stabilization processing by the voltage stabilizer 60 and then supplies power to the controller 40, the process parameter detector 30, and the battery combination mode switch 90, as shown in fig. 1, where the power supply voltage is Ve. The positive electrode of the rechargeable battery pack 11 is connected to the boost DC/DC converter 70, and the boost DC/DC converter 70 performs a boost process and supplies power to the bidirectional electronic switches 50, that is, to the collectors of the transistors Q1 and Q2.
Based on the device for improving the discharge capacity of the storage battery, the invention also provides a method for improving the discharge capacity of the storage battery, which comprises the following steps:
1) it is determined whether the terminal voltage of the continued energy battery pack 11 is equal to or less than the terminal voltage of the operating battery pack, or the terminal voltage of the operating battery pack reaches the lower limit threshold value although the terminal voltage of the continued energy battery pack 11 is greater than the terminal voltage of the operating battery pack and cannot be compensated by the charging of the continued energy battery pack 11: if yes, stopping the energy continuing device 10 to charge each working battery unit in turn; if not, turning to 2);
2) if the working battery pack is discharged to cause the electric energy to drop, and the terminal voltage of the continuous energy battery pack 11 should be greater than the terminal voltage of the working battery pack, based on the control of the controller 40 on the charging and discharging switching state of the bidirectional electronic switch 50, the energy charger 10 charges the working battery cells of the working battery pack 20 in turn, and during each charging:
the controller 40 sends a charging instruction to at least one bidirectional electronic switch 50 and a discharging instruction to the other bidirectional electronic switches 50, the bidirectional electronic switch 50 receiving the charging instruction is switched to the charging mode, so that the charger 10 charges the working battery unit connected to the bidirectional electronic switch 50 switched to the charging mode, and meanwhile, the bidirectional electronic switch 50 receiving the discharging instruction is switched to the discharging mode, so that the working battery unit connected to the bidirectional electronic switch 50 switched to the discharging mode is discharged to the load;
3) return 1).
In the present invention, the charging voltage output by the energy continuing device 10 is the sum of the terminal voltage of the energy continuing battery pack 11 and the voltage converted by the inside of the electric potential booster 12, for example, the terminal voltage of the energy continuing battery pack 11 is 12V, the electric potential booster 12 converts the received 12V voltage of the energy continuing battery pack 11 to obtain a voltage 2V, and then the charging voltage output by the energy continuing device 10 is 12V +2V, that is, 14V.
The charge and discharge process will now be described by taking the charging of the working battery cell B1 as an example: the controller 40 sends a charging command to the bidirectional electronic switch 50 correspondingly connected to the working battery cell B1, i.e. sends a high voltage, so that the transistor Q1 is turned on to drive the charging switch transistor Kcl to be turned on, the working battery cell B1 connected to the bidirectional electronic switch 50 is turned on to the charger 10 to receive the charging voltage output by the charger 10 for charging, the high voltage sent by the controller 40 is inverted by the inverter F to become a low voltage, the transistor Q2 is turned off, the discharging switch transistor Kd1 is turned off, and the working battery cell B1 is in a discharge-prohibited state at this time.
Meanwhile, the controller 40 sends a discharging command to the bidirectional electronic switch 50 correspondingly connected with the working battery units B2-Bn, that is, sends a low potential, which becomes a high potential after the phase inversion of the inverter F, so that the transistor Q2 in each of the other bidirectional electronic switches 50 is turned on to drive each discharging switch transistor Kd1 to be turned on, the working battery units B2-Bn are turned on to the discharging output interface 80 to discharge the load, the transistor Q1 is turned off, the charging switch transistor Kc1 is turned off, and the working battery units B2-Bn are not charged at this time.
For the battery discharging capability improving apparatus of the present invention designed with the process parameter detector 30, the step 2) is further executed with the following steps:
the controller 40 controls the start and stop of the potential booster 12 and adjusts the voltage value obtained by transforming the potential booster 12 itself based on the terminal voltage value of the energy-sustaining battery pack 11, the charging current value of the output side of the potential booster 12, and the terminal voltage value and the discharging current value of the working battery pack, thereby realizing the adjustment of the charging voltage value output by the energy-sustaining device 10 so as to enable the working battery unit to be in the optimal charging state all the time.
Further, the method comprises the following steps:
when the respective working battery cells start to be charged in turn one by one, the controller 40 issues a start instruction to the level-raising device 12, and the level-raising device 12 starts to operate.
When the successive alternate charging of the respective working battery cells is stopped, the controller 40 issues a stop instruction to the level-raising device 12, and the level-raising device 12 stops operating.
When detecting that the terminal voltage of the rechargeable battery pack 11 decreases, the controller 40 sends a voltage increasing and converting instruction to the level-raising unit 12, where the instruction is to increase the voltage value converted by the level-raising unit 12 itself, so that the level-raising unit 12 maintains the originally output charging voltage to meet the charging requirement.
When detecting that the charging voltage output by the charger 10 is increased, the controller 40 sends a voltage reduction and conversion command to the level booster 12, where the command is to reduce the voltage value converted by the level booster 12 itself so as to avoid the overcharge problem of the charged working battery unit.
If the control target is set to be the charging current value equal to the discharging current value/n during the step 2), then:
when the charging current value is greater than the discharging current value/n, based on the detected terminal voltage of the rechargeable battery pack 11, the controller 40 sends a voltage reduction and conversion instruction to the potential booster 12, and the voltage value obtained by converting the potential booster 12 per se is reduced as required, so that the charging voltage output by the potential booster 12 is reduced, and the goal that the charging current value is equal to the discharging current value/n is achieved; when the charging current value is smaller than the discharging current value/n, based on the detected terminal voltage of the rechargeable battery pack 11, the controller 40 sends a voltage increasing and converting instruction to the potential booster 12, and the voltage value converted by the potential booster 12 itself is increased as required, so that the charging voltage output by the potential booster 12 is increased to achieve the goal that the charging current value is equal to the discharging current value/n.
In practical design, the control target can be set to have a charging current value larger than a discharging current value/n or a charging current value smaller than the discharging current value/n, which can be flexibly set according to practical requirements without limitation.
In step 1), if the terminal voltage of the energy-continuing battery pack 11 is equal to or less than the terminal voltage of the working battery pack, or the terminal voltage of the energy-continuing battery pack 11 is greater than the terminal voltage of the working battery pack but the terminal voltage of the working battery pack reaches a lower threshold value and cannot be compensated by charging of the energy-continuing battery pack 11, the energy-continuing device 10 is stopped to charge each working battery unit in turn, and the energy-continuing battery pack 11 and the working battery pack are discharged together by switching the switch 90 in a battery combination mode, so that the electric energy of the storage battery is fully utilized.
In the invention, the number of the working battery units charged at each time can be one or more, and the charging method is not limited, and a proper amount of working battery units can be simultaneously charged according to requirements.
The invention can be implemented by dividing the working battery pack and the energy-continuing battery pack of the existing mature storage battery and adding some control and processing components, has low implementation cost, good operation stability, easy operation and control, long service life and light weight of the whole device, and is easy to popularize and apply in various fields.
The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solutions of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.
Claims (8)
1. The utility model provides a battery discharge capacity hoisting device which characterized in that: it includes that work group battery, continuation of energy ware, controller, two-way electronic switch and battery combination mode change over switch, wherein:
the working battery pack comprises a plurality of working battery units; the energy accumulator comprises an energy accumulator group and a potential booster; the energy-continuing battery pack supplies power to the potential booster and is connected with the potential booster in series to output a charging voltage higher than the voltage of the working battery cell terminal to the working battery pack; each working battery unit is provided with a bidirectional electronic switch, and the controller realizes the change of the charging and discharging states of the working battery units by controlling the charging and discharging switching states of the bidirectional electronic switch; the controller sends out cyclic shift charging signals to the bidirectional electronic switches to realize that the energy accumulator charges the working battery units in turn one by one, at least one working battery unit is charged each time, but each non-charged working battery unit discharges to the load, wherein each charged working battery unit receives charging voltage for charging after being connected in parallel through the bidirectional electronic switches, and each discharged working battery unit discharges to the load from the discharging output interface after being connected in parallel through the bidirectional electronic switches;
the positive pole of continuation energy group battery, the input side positive pole of electric potential lifting mechanism, the output interface that discharges are connected with battery combination mode change over switch's corresponding switching connection end respectively, and battery combination mode change over switch's switching control end is connected with the corresponding control signal output part of controller, wherein: judging whether the terminal voltage of the intermittent energy battery pack is equal to or less than the terminal voltage of the working battery pack or whether the terminal voltage of the continuous energy battery pack reaches a lower limit threshold value although the terminal voltage of the continuous energy battery pack is greater than the terminal voltage of the working battery pack so as not to be compensated by charging of the continuous energy battery pack: if so, the continuous battery pack is conducted with the discharge output interface through the battery combination mode change-over switch, so that the continuous battery pack and the working battery pack discharge to the load together, otherwise, the continuous battery pack is conducted with the potential booster through the battery combination mode change-over switch, so that the continuous battery pack supplies power to the potential booster.
2. The battery discharging capability improving apparatus according to claim 1, wherein:
the negative electrodes of all the working battery units are grounded, and the positive electrodes of all the working battery units are independent and are respectively connected with the battery connecting end of the corresponding bidirectional electronic switch;
the energy-continuing battery pack comprises a plurality of energy-continuing battery units, the negative electrodes of all the energy-continuing battery units are grounded, the positive electrodes of all the energy-continuing battery units are divided into two paths, one path is connected with the positive electrode of the input side of the potential booster, and the other path is connected with the negative electrode of the output side of the potential booster;
the positive electrode of the output side of the potential booster is connected with the charging end of each bidirectional electronic switch, the discharging end of each bidirectional electronic switch is connected with the discharging output interface, and the charging and discharging control end of each bidirectional electronic switch is respectively connected with the corresponding charging and discharging control signal output end of the controller.
3. The battery discharging capability improving apparatus according to claim 1, wherein:
two-way electronic switch is including the electronic switch that charges and the electronic switch that discharges, and the one end of the electronic switch that charges is connected the output side of potential lifting mechanism is anodal, and the other end of the electronic switch that charges divides two the tunnel, all the way with corresponding one the anodal of work battery unit is connected, and another way is connected with the one end of the electronic switch that discharges, the other end of the electronic switch that discharges with discharge output interface connection, the electronic switch that charges, the electronic switch that discharges the switch control end with corresponding same charge-discharge control signal output part on the controller is connected, and charge in the electronic switch, discharge in the electronic switch any with be connected with the phase inverter between the controller to make and alternately switch on, turn-off with the opposite phase state between the electronic switch that charges and the electronic switch that discharges.
4. The battery discharging capability improving apparatus according to claim 3, wherein:
the charge electronic switch includes a charge switch transistor, the discharge electronic switch includes a discharge switch transistor, wherein: the charging switch transistor and the discharging switch transistor are connected in a half-bridge mode, the common connecting end of the charging switch transistor and the discharging switch transistor is connected with the positive electrode of the corresponding working battery unit, the charging switch transistor and the discharging switch transistor are respectively connected with the respective driving circuit, and the driving circuits are connected with the controller.
5. The battery discharging capability improving apparatus according to claim 1, wherein:
the potential booster is an isolated voltage-adjustable DC/DC converter.
6. The battery discharging capability improving apparatus according to any one of claims 1 to 5, characterized in that:
the battery discharge capacity improving apparatus includes a process parameter detector, wherein: the process parameter detector comprises a charging current sensor and a discharging current sensor, wherein the charging current sensor is connected between the potential booster and each bidirectional electronic switch and used for detecting charging current, the discharging current sensor is connected between each bidirectional electronic switch and the discharging output interface and used for detecting discharging current, a detection signal output end of the charging current sensor is connected with a corresponding A/D conversion signal end of the controller through a first amplifying circuit, and a detection signal output end of the discharging current sensor is connected with a corresponding A/D conversion signal end of the controller through a second amplifying circuit;
the positive pole of the energy-continuing battery pack and the positive pole of the working battery pack are connected with corresponding A/D conversion signal ends of the controller, and the start-stop control end and the charging voltage regulation control end of the potential booster are respectively connected with corresponding control signal output ends of the controller.
7. A method for improving the discharge capacity of a storage battery, which is implemented based on the device for improving the discharge capacity of a storage battery according to any one of claims 1 to 6, comprising the steps of:
1) judging whether the terminal voltage of the energy-continuing battery pack is equal to or less than the terminal voltage of the working battery pack, or whether the terminal voltage of the energy-continuing battery pack reaches a lower limit threshold value although the terminal voltage of the energy-continuing battery pack is greater than the terminal voltage of the working battery pack and cannot be compensated by charging of the energy-continuing battery pack: if so, stopping the energy charger to charge each working battery unit in turn; if not, turning to 2);
2) if the electric energy of the working battery pack is reduced, the energy charging device is enabled to charge the working battery units of the working battery pack in turn one by one based on the control of the controller on the charging and discharging switching state of the bidirectional electronic switch, and during each charging:
the controller sends a charging instruction to at least one bidirectional electronic switch and a discharging instruction to other bidirectional electronic switches, the bidirectional electronic switch receiving the charging instruction is switched to a charging mode to enable the energy accumulator to charge the working battery unit connected with the bidirectional electronic switch switched to the charging mode, and the bidirectional electronic switch receiving the discharging instruction is switched to a discharging mode to enable the working battery unit connected with the bidirectional electronic switch switched to the discharging mode to discharge to a load;
3) return 1).
8. The method for improving the discharge capacity of a secondary battery according to claim 7, wherein:
the method also comprises the following steps when the step 2) is executed:
the controller controls the start and stop of the potential booster based on the terminal voltage value of the energy-continuing battery pack, the charging current value output by the potential booster, the terminal voltage value of the working battery pack and the discharging current value of the working battery pack, and adjusts the voltage value obtained by converting the potential booster to realize the adjustment of the charging voltage value output by the energy-continuing device.
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