CN112531849A - Storage battery pack voltage-sharing device - Google Patents
Storage battery pack voltage-sharing device Download PDFInfo
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- CN112531849A CN112531849A CN202011451299.4A CN202011451299A CN112531849A CN 112531849 A CN112531849 A CN 112531849A CN 202011451299 A CN202011451299 A CN 202011451299A CN 112531849 A CN112531849 A CN 112531849A
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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 storage battery pack voltage-sharing device. The storage battery pack voltage-sharing device is connected to the positive end and the negative end of a single battery in the storage battery pack; the storage battery voltage-sharing device comprises: the circuit comprises a sampling comparison circuit, a current amplification circuit and an indication circuit; the first end and the second end of the sampling comparison loop are respectively connected to the positive end and the negative end of the single battery, and the sampling comparison loop is used for collecting the positive voltage and the negative voltage of the single battery and controlling the working state of the current amplification loop; the current amplification loop includes: the current amplification circuit comprises a first end, a second end, a control end and an indication signal output end, wherein the first end and the second end of the current amplification circuit are respectively connected to the positive end and the negative end of the single battery; the indicating circuit is used for indicating the working state of the storage battery pack voltage-sharing device. The storage battery pack voltage-sharing device provided by the invention achieves the effects of high reliability and long service life of the storage battery pack.
Description
Technical Field
The embodiment of the invention relates to a storage battery charging technology, in particular to a storage battery pack voltage-sharing device.
Background
At present, a transformer substation generally adopts a storage battery pack with 52 or 104 single batteries and 2V voltage to form a 110V or 220V station storage battery pack in series connection. When the storage battery is under-voltage or over-voltage in the operation process, operation and maintenance personnel are required to check the storage battery on site, and corresponding measures such as storage battery activation, storage battery replacement, operation parameter change and the like are taken according to the check result to process, so that the operation and maintenance pressure is increased greatly.
The reasons of the storage battery production process often lead to the fact that the internal structure and the material of each single storage battery are not completely consistent, and further, certain performance difference exists among the single storage batteries. Due to the influence of the inconsistency of the single storage batteries, the voltage, the internal resistance, the capacity, the service life and other properties of different storage battery packs composed of different single storage batteries have great difference, and the inconsistency of the single storage batteries is accumulated along with the continuous charging and discharging of the storage battery packs in the running process, so that the property difference of each single storage battery is gradually enlarged, the property of the single storage battery is accelerated to be attenuated under certain conditions, the storage battery pack is finally caused to fail prematurely, and the operation and maintenance pressure of a transformer substation is increased greatly.
Disclosure of Invention
The invention provides a storage battery pack voltage-sharing device, which is used for delaying the attenuation speed of a storage battery pack, prolonging the service life of the storage battery pack and achieving the effects of high reliability and long service life of the storage battery pack.
The embodiment of the invention provides a storage battery pack voltage-sharing device, which is connected to the positive end and the negative end of a single battery in a storage battery pack;
the storage battery pack voltage-sharing device comprises: the circuit comprises a sampling comparison circuit, a current amplification circuit and an indication circuit; the sampling comparison circuit comprises a first end, a second end and a control quantity output end, the first end and the second end of the sampling comparison circuit are respectively connected to the positive end and the negative end of the single battery, and the sampling comparison circuit is used for collecting the positive and negative voltages of the single battery and controlling the working state of the current amplification circuit;
the current amplification loop comprises: the current amplification circuit comprises a first end, a second end, a control end and an indication signal output end, wherein the first end and the second end of the current amplification circuit are respectively connected to the positive end and the negative end of the single battery;
the indicating circuit comprises a power supply end and a control end, the power supply end of the indicating circuit is connected with the anode of the single battery, the control end of the indicating circuit is connected with the indicating signal output end of the current amplifying circuit, and the indicating circuit is used for indicating the working state of the storage battery pack voltage-sharing device.
Optionally, the sampling comparison circuit further comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; the first end of the first resistor is used as the first end of the sampling comparison loop, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is used as the second end of the sampling comparison loop, the third resistor and the fourth resistor are connected in series between the second end of the first resistor and the second end of the sampling comparison loop, and the common connecting end of the third resistor and the fourth resistor is used as the control quantity output end of the sampling comparison loop.
Optionally, the current amplification loop further comprises: a first amplification circuit and a second amplification circuit;
the first amplification loop comprises a first triode, a fifth resistor and a sixth resistor; a base electrode of the first triode is used as a control end of the current amplification circuit, a first pole of the first triode is connected with one end of the fifth resistor, the other end of the fifth resistor is used as a first end of the current amplification circuit, a second pole of the first triode is connected with one end of the sixth resistor, and the other end of the sixth resistor is used as a second end of the current amplification circuit;
the second amplification loop comprises a second triode, a seventh resistor and a first diode, a first pole of the second triode is connected with a first end of the current amplification loop through the first diode and the seventh resistor, a second pole of the second triode is connected with a second end of the current amplification loop, and the base voltage of the second triode is controlled by the first triode.
Optionally, the current amplification loop further comprises an additional control circuit;
the additional control circuit comprises a third triode, an eighth resistor and a ninth resistor, a first pole of the third triode is connected with the first end of the current amplification loop through the eighth resistor, a second pole of the third triode is connected with the base electrode of the second triode through the ninth resistor, and the additional control circuit is used for controlling the conduction and the disconnection of the second amplification loop.
Optionally, the first amplification loop further includes a second diode and a tenth resistor, and the second diode and the tenth resistor are connected in series and then connected in parallel to two ends of the sixth resistor.
Optionally, the sampling comparison circuit further includes a third diode and an eleventh resistor, and the third diode and the eleventh resistor are connected in series and then connected in parallel to two ends of the first resistor.
Optionally, the sampling comparison circuit further includes a fourth diode and a twelfth resistor, and the fourth diode and the twelfth resistor are connected in series and then connected in parallel to two ends of the second resistor.
Optionally, the turn-on voltages of the first diode, the second diode, the third diode and the fourth diode are all 0.5V.
Optionally, the indication circuit further comprises: the cathode of the light-emitting diode is connected with one end of the thirteenth resistor, the anode of the light-emitting diode is used as the power supply end of the indicating circuit, and the other end of the thirteenth resistor is used as the control end of the indicating circuit.
Optionally, the first transistor, the second transistor, and the third transistor are respectively 2N222, 2N3904, and 2N2906 in model number.
The invention collects the voltage at two ends of the single battery by arranging the sampling comparison circuit, controls the working state of the current amplification circuit according to the voltage at two ends of the single battery to change the total current passing through the storage battery pack voltage equalizing device, and after the electric quantity of the storage battery reaches a fixed value, the higher the electric quantity of the storage battery is, the larger the flow rate of the storage battery pack voltage equalizing device is, so that the charging speed of the single battery with high electric quantity in the storage battery pack is greatly reduced, the whole storage battery pack keeps uniform charging until all the single batteries in the storage battery pack are fully charged, and the storage battery pack is converted from uniform charging to floating charging, thereby realizing the electric quantity balance of the single batteries in the storage battery pack, reducing the performance difference of the single batteries, delaying the attenuation speed of the storage battery pack, prolonging the service.
Drawings
Fig. 1 is a schematic diagram of a battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another battery pack voltage equalizing device according to an embodiment of the present invention;
fig. 8 is a circuit diagram of another battery pack voltage equalizing device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a storage battery pack voltage equalizing device 100. Fig. 1 is a schematic diagram of a battery pack voltage equalizing device 100 according to an embodiment of the present invention, and referring to fig. 1, the battery pack voltage equalizing device 100 is connected to positive and negative ends of a single cell in a battery pack; the storage battery pack voltage equalizing device 100 includes: a sampling comparison circuit 101, a current amplification circuit 102 and an indication circuit 103; the sampling comparison circuit 101 comprises a first end 104, a second end 105 and a controlled quantity output end 106, the first end 104 and the second end 105 of the sampling comparison circuit 101 are respectively connected to the positive end and the negative end of the single battery, and the sampling comparison circuit 101 is used for collecting the positive and negative voltages of the single battery and controlling the working state of the current amplification circuit 102; the current amplification circuit 102 includes: the current amplification circuit 102 comprises a first end 107, a second end 108, a control end 109 and an indication signal output end 110, wherein the first end 107 and the second end 108 of the current amplification circuit 102 are respectively connected to the positive end and the negative end of a single battery, the control end 109 is connected with a controlled quantity output end 106 of the sampling comparison circuit 101, and the current amplification circuit 102 is used for providing different current paths according to the voltage of the controlled quantity output end 106; the indicating circuit 103 comprises a power supply end and a control end 109, the power supply end of the indicating circuit 103 is connected with the positive electrode of the single battery, the control end 109 of the indicating circuit 103 is connected with an indicating signal output end 110 of the current amplifying circuit 102, and the indicating circuit 103 is used for indicating the working state of the storage battery pack voltage-sharing device 100.
The first end 104 and the second end 105 of the sampling comparison circuit 101 are respectively connected to the positive end and the negative end of the single battery, and the working state of the current amplification circuit 102 can be controlled according to the collected voltages at the two ends of the single battery, so as to change the resistance between the first end 107 and the second end 108 of the current amplification circuit 102; in different states of the sampling comparison circuit 101, the resistance between the first end 107 and the second end 108 of the current amplification circuit 102 is different, so that the total current passing through the storage battery pack voltage-sharing device 100 is changed; the instruction circuit 103 is controlled by the current amplification circuit 102, and the instruction circuit 103 is turned on when the resistance between the first end 107 and the second end 108 of the current amplification circuit 102 is minimum.
For example, in the process of charging the storage battery pack, as the electric quantity of each single battery increases, the voltages at the two ends of each single battery also increase, and the voltage value acquired by the sampling comparison circuit 101 also increases, if the voltage at the two ends of one single battery reaches 93% of the float charging voltage, the voltage at the control quantity output end 106 of the sampling comparison circuit 101 increases, and the control current amplification circuit 102 is in the first conduction state; when the voltage at the two ends of the single battery is continuously increased to the floating charge voltage, the voltage at the control quantity output end 106 of the sampling comparison circuit 101 is continuously increased, and the current amplification circuit 102 is controlled to be in a second conduction state; the total resistance of the control current amplification circuit 102 in the second conduction state is greater than the total resistance of the control current amplification circuit 102 in the first conduction state, and the control current amplification circuit 102 in the second conduction state can provide a larger path for the current flowing through the single battery; as the voltage across the individual cells continues to increase, the total current flowing through the battery pack voltage equalizing device 100 increases, and the total current flowing through the battery pack voltage equalizing device 100 is 0.3A at maximum. In the process, although the voltage of some single batteries reaches the floating charging voltage, due to the shunting action of the storage battery pack voltage equalizing device 100 connected to the two ends of the single batteries, the voltage of the whole storage battery pack does not reach the condition of converting from uniform charging to floating charging, the storage battery pack still continues to be uniformly charged, the charging current of the fully charged single batteries is shunted by the storage battery pack voltage equalizing device 100, the charging speed is greatly reduced until all the single batteries of the whole storage battery pack are fully charged, and the storage battery pack is converted from uniform charging to floating charging.
The storage battery pack voltage-sharing device 100 provided by the embodiment of the invention is provided with the sampling comparison circuit 101 for collecting the voltages at two ends of the single batteries, and the working state of the current amplification circuit 102 is controlled according to the voltages at the two ends of the single batteries to change the total current passing through the storage battery pack voltage-sharing device 100, after the electric quantity of the storage battery reaches a fixed value, the electric quantity of the storage battery is higher, the shunt quantity of the storage battery pack voltage-sharing device 100 is higher, so that the charging speed of the single batteries with high electric quantity in the storage battery pack is greatly reduced, the whole storage battery pack keeps uniform charging until all the single batteries in the storage battery pack are fully charged, and the storage battery pack is converted from uniform charging to floating charging, so that the electric quantity balance of the single batteries in the storage battery pack is realized, the performance difference of the, Long service life.
Fig. 2 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 2, optionally, the sampling comparison circuit 101 further includes: a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the first end of the first resistor R1 is used as the first end 104 of the sampling comparison loop 101, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is used as the second end 105 of the sampling comparison loop 101, the third resistor R3 and the fourth resistor R4 are connected in series between the second end of the first resistor R1 and the second end 105 of the sampling comparison loop 101, and the common connection end 106 of the third resistor R3 and the fourth resistor R4 is used as the control quantity output end 106 of the sampling comparison loop 101.
The voltage of the common connection end 106 of the third resistor R3 and the fourth resistor R4 is a control signal input to the current amplification circuit 102, and the current amplification circuit 102 switches different working states according to the difference of the control signal.
Illustratively, in the process of equalizing the charge of the storage battery pack, the voltage of the control quantity output end 106 of the sampling comparison circuit 101 of each single battery is continuously increased, if the voltage of two ends of one single battery reaches 93% of the float charge voltage, the voltage of the control quantity output end 106 of the sampling comparison circuit 101 controls the current amplification circuit 102 to conduct the first amplification circuit, when the voltage of two ends of the single battery is continuously increased to the float charge voltage, the voltage of the control quantity output end 106 of the sampling comparison circuit 101 controls the current amplification circuit 102 to conduct the second amplification circuit, the second amplification circuit is conducted while the indicating circuit 103 is conducted, the indicating circuit 103 is used for indicating the working state of the storage battery pack voltage equalizing device 100, and the larger the total current passing through the storage battery pack voltage equalizing device 100 is, the higher the brightness of; with the first amplification circuit and the second amplification circuit being conducted, the total current flowing through the battery pack voltage-sharing device 100 increases step by step, and the maximum total current flowing through the battery pack voltage-sharing device 100 is 0.3A. In the process, although the voltage of some single batteries reaches the float charging voltage, due to the shunting action of the storage battery pack voltage equalizing device 100, the voltage of the whole storage battery pack does not reach the condition of changing from uniform charging to float charging, the storage battery pack still continues to be uniformly charged, the charging current of the fully charged single batteries is shunted by the storage battery pack voltage equalizing device 100, the charging speed is greatly reduced until all the single batteries of the whole storage battery pack are fully charged, and the storage battery pack is changed from uniform charging to float charging.
According to the storage battery pack voltage equalizing device 100 provided by the embodiment of the invention, the sampling comparison circuit 101 is used for collecting the voltages at the two ends of the single battery, and the working state of the current amplification circuit 102 is controlled according to the voltages at the two ends of the single battery, so that the electricity balance of the single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the storage battery pack are achieved.
Fig. 3 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 3, optionally, the current amplifying circuit 102 further includes: a first amplification circuit 114 and a second amplification circuit 115; the first amplifying circuit 114 includes a first transistor Q1, a fifth resistor R5, and a sixth resistor R6; a base electrode of the first triode Q1 is used as a control end 109 of the current amplification loop 102, a first pole of the first triode Q1 is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is used as a first end 107 of the current amplification loop 102, a second pole of the first triode Q1 is connected with one end of a sixth resistor R6, and the other end of the sixth resistor R6 is used as a second end 108 of the current amplification loop 102; the second amplifying circuit 115 includes a second transistor Q3, a seventh resistor R7, and a first diode D1, a first pole of the second transistor Q3 is connected to the first end of the current amplifying circuit 102 through the first diode D1 and the seventh resistor R7, a second pole of the second transistor Q3 is connected to the second end of the current amplifying circuit 102, and a base voltage of the second transistor Q3 is controlled by the first transistor Q1.
The first amplification loop 114 can be conducted when the voltage at the two ends of the single battery reaches 93% of the floating charging voltage, and the second amplification loop 115 can be conducted when the voltage at the two ends of the single battery reaches the floating charging voltage, so that a path is provided for the charging current of the single battery with the higher charging speed in the storage battery pack, the charging speed of the single battery with the higher charging speed is reduced, the electric quantity balance of each single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the storage battery pack are achieved.
Fig. 4 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 4, optionally, the current amplifying circuit 102 further includes an additional control circuit 116; the additional control circuit 116 includes a third transistor Q3, an eighth resistor R8, and a ninth resistor R9, a first pole of the third transistor Q3 is connected to the first end of the current amplifying circuit 102 via the eighth resistor R8, a second pole of the third transistor Q3 is connected to the base of the second transistor Q3 via the ninth resistor R9, and the additional control circuit 116 is configured to control the second amplifying circuit 115 to turn on and off.
The on and off of the additional control circuit 116 is controlled by the first voltage of the first transistor Q1, and the additional control circuit 116 may be turned on when the voltage across the battery cell reaches 98% of the float charge voltage, and further controls the second amplification circuit 115 to be turned on when the voltage across the battery cell reaches the float charge voltage. According to the storage battery pack voltage-sharing device 100 provided by the embodiment of the invention, the additional control circuit 116 is arranged, so that the conduction control of the second amplification loop 115 is more accurate, a path is provided for the charging current of the single battery with the higher charging speed in the storage battery pack, the charging speed of the single battery with the higher charging speed is reduced, the electric quantity balance of each single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the storage battery pack are achieved.
Fig. 5 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 5, optionally, the first amplifying circuit 114 further includes a second diode D2 and a tenth resistor R10, and the second diode D2 and the tenth resistor R10 are connected in series and then connected in parallel to two ends of the sixth resistor R6.
When the voltage across the second diode D2 reaches the turn-on voltage, the second diode D2 turns on, the total resistance of the first amplifying circuit 114 decreases, and the current that can pass through the first amplifying circuit 114 increases. According to the storage battery pack voltage-sharing device 100 provided by the embodiment of the invention, the two ends of the resistor in the first amplification loop 114 are connected with the branches with the diodes in parallel, so that the resistance of the first amplification loop 114 is reduced, the current passing through the first amplification loop 114 is increased, a path is provided for the charging current of the single battery with the higher charging speed in the storage battery pack, the charging speed of the single battery with the higher charging speed is reduced, the electric quantity balance of each single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the storage battery pack are achieved.
Fig. 6 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 6, optionally, the sampling comparison circuit 101 further includes a third diode D3 and an eleventh resistor R11, and the third diode D3 is connected in series with the eleventh resistor R11 and then connected in parallel across the first resistor R1.
When the voltage across the third diode D3 reaches the turn-on voltage, the third diode D3 is turned on, the total resistance of the sampling comparison circuit 101 decreases, and the total current that can pass through increases. According to the storage battery pack voltage-sharing device 100 provided by the embodiment of the invention, the two ends of the first resistor R1 are connected with the branches with the diodes in parallel, so that the total resistance of the sampling comparison circuit 101 is reduced, the current passing through the sampling comparison circuit 101 is increased, a path is provided for the charging current of the single battery with the higher charging speed in the storage battery pack, the charging speed of the single battery with the higher charging speed is reduced, the electric quantity balance of each single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the.
Fig. 7 is a schematic diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 7, optionally, the sampling comparison circuit 101 further includes a fourth diode D4 and a twelfth resistor R12, and the fourth diode D4 and the twelfth resistor R12 are connected in series and then connected in parallel to two ends of the second resistor R2.
When the voltage across the fourth diode D4 reaches the turn-on voltage, the fourth diode D4 is turned on, the total resistance of the sampling comparison circuit 101 decreases, and the total current that can pass through increases. According to the storage battery pack voltage-sharing device 100 provided by the embodiment of the invention, the two ends of the second resistor R2 are connected with the branches with the diodes in parallel, so that the total resistance of the sampling comparison circuit 101 is reduced, the current passing through the sampling comparison circuit 101 is increased, a path is provided for the charging current of the single battery with the higher charging speed in the storage battery pack, the charging speed of the single battery with the higher charging speed is reduced, the electric quantity balance of each single battery in the storage battery pack is realized, the performance difference of the single battery is reduced, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the.
Optionally, the turn-on voltages of the first diode D1, the second diode D2 and the third diode D3 are all 0.5V.
Fig. 8 is a circuit diagram of another battery pack voltage equalizing device 100 according to an embodiment of the present invention, referring to fig. 8, optionally, the indicating circuit 103 further includes: a light emitting diode L and a thirteenth resistor R13, wherein the cathode of the light emitting diode L is connected to one end of the thirteenth resistor R13, the anode of the light emitting diode L is used as the power supply terminal of the indicating circuit 103, and the other end of the thirteenth resistor R13 is used as the control terminal 109 of the indicating circuit 103.
The light emitting diode L is turned on when the second amplification circuit 115 is turned on, and the light emitting diode L has higher brightness as the current flowing through the second amplification circuit 115 is larger.
For example, in the charging process of the storage battery pack, if the voltage across one single battery is lower than 90% of the float charging voltage, all diodes and triodes in the storage battery pack voltage equalizing device 100 connected with the single battery are not conducted; along with the increase of the electric quantity of the single battery, when the voltages at the two ends of the single battery reach 91% -93% of the floating charging voltage, the third diode D3 and the fourth diode D4 are sequentially conducted, the resistance of the sampling comparison circuit 101 is sequentially reduced, a better path is provided for the charging current of the single battery, and the charging speed of the single battery is reduced; when the voltage at the two ends of the single battery reaches 93% of the floating charging voltage, the first triode Q1 is conducted, the current flows through the first amplification loop 114, if the voltage at the two ends of the single battery continues to increase, the second diode D2 is conducted, and the resistance of the first amplification loop 114 is further reduced; when the voltage across the cell reaches 98% of the float charge voltage, the second transistor Q3 is turned on, but no current flows in the additional control circuit 116; when the voltage across the single battery reaches the floating charge voltage, the second triode Q2 is turned on, at this time, the first diode in the second amplification loop 115 is also turned on, and the second amplification loop 115 has current flowing through; the light emitting diode emits light L when the second triode Q2 is conducted, and the light emitting diode is used for indicating that the single battery reaches the float charging voltage; at this time, although the voltage at the two ends of the single battery reaches the float charging voltage, if other single batteries do not reach the float charging voltage, the storage battery pack is still in the uniform charging state, and the charging mode of the storage battery pack is not converted into the float charging mode until all the single batteries in the storage battery pack reach the float charging voltage.
With continued reference to fig. 8, optionally, the first transistor Q1, the second transistor Q3, and the third transistor Q3 are each 2N222, 2N3904, and 2N 2906.
The storage battery pack voltage-sharing device 100 provided by the embodiment of the invention is provided with a sampling comparison circuit 101 for acquiring the voltage at two ends of a single battery, and controls the operating state of the current amplifying circuit 102 according to the voltages across the unit cells to change the total current passing through the battery pack voltage equalizing device 100, after the battery capacity reaches a fixed value, the higher the battery capacity is, the larger the branch flow of the battery pack voltage equalizing device 100 is, therefore, the charging speed of the single battery with high electric quantity in the storage battery pack is greatly reduced, the whole storage battery pack is uniformly charged until all the single batteries in the storage battery pack are fully charged, the storage battery pack is changed from uniform charging to floating charging, the electric quantity balance of the single batteries in the storage battery pack is realized, the attenuation speed of the storage battery pack is delayed, the service life of the storage battery pack is prolonged, and the effects of high reliability and long service life of the storage battery pack are achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A voltage-sharing device for a storage battery pack is characterized in that,
the storage battery pack voltage equalizing device is connected to the positive end and the negative end of a single battery in the storage battery pack;
the storage battery pack voltage-sharing device comprises: the circuit comprises a sampling comparison circuit, a current amplification circuit and an indication circuit; the sampling comparison circuit comprises a first end, a second end and a control quantity output end, the first end and the second end of the sampling comparison circuit are respectively connected to the positive end and the negative end of the single battery, and the sampling comparison circuit is used for collecting the positive and negative voltages of the single battery and controlling the working state of the current amplification circuit;
the current amplification loop comprises: the current amplification circuit comprises a first end, a second end, a control end and an indication signal output end, wherein the first end and the second end of the current amplification circuit are respectively connected to the positive end and the negative end of the single battery;
the indicating circuit comprises a power supply end and a control end, the power supply end of the indicating circuit is connected with the anode of the single battery, the control end of the indicating circuit is connected with the indicating signal output end of the current amplifying circuit, and the indicating circuit is used for indicating the working state of the storage battery pack voltage-sharing device.
2. The battery pack voltage equalizing apparatus according to claim 1, wherein the sampling comparison circuit further comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor; the first end of the first resistor is used as the first end of the sampling comparison loop, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is used as the second end of the sampling comparison loop, the third resistor and the fourth resistor are connected in series between the second end of the first resistor and the second end of the sampling comparison loop, and the common connecting end of the third resistor and the fourth resistor is used as the control quantity output end of the sampling comparison loop.
3. The battery pack voltage equalizing device according to claim 1, wherein said current amplifying circuit further comprises: a first amplification circuit and a second amplification circuit;
the first amplification loop comprises a first triode, a fifth resistor and a sixth resistor; a base electrode of the first triode is used as a control end of the current amplification circuit, a first pole of the first triode is connected with one end of the fifth resistor, the other end of the fifth resistor is used as a first end of the current amplification circuit, a second pole of the first triode is connected with one end of the sixth resistor, and the other end of the sixth resistor is used as a second end of the current amplification circuit;
the second amplification loop comprises a second triode, a seventh resistor and a first diode, a first pole of the second triode is connected with a first end of the current amplification loop through the first diode and the seventh resistor, a second pole of the second triode is connected with a second end of the current amplification loop, and the base voltage of the second triode is controlled by the first triode.
4. The battery pack voltage equalizing apparatus according to claim 3, wherein said current amplification circuit further comprises an additional control circuit;
the additional control circuit comprises a third triode, an eighth resistor and a ninth resistor, a first pole of the third triode is connected with the first end of the current amplification loop through the eighth resistor, a second pole of the third triode is connected with the base electrode of the second triode through the ninth resistor, and the additional control circuit is used for controlling the conduction and the disconnection of the second amplification loop.
5. The storage battery pack voltage equalizing device according to claim 3, wherein the first amplifying circuit further comprises a second diode and a tenth resistor, and the second diode and the tenth resistor are connected in series and then connected in parallel to two ends of the sixth resistor.
6. The storage battery pack voltage equalizing device according to claim 2, wherein the sampling comparison circuit further comprises a third diode and an eleventh resistor, and the third diode and the eleventh resistor are connected in series and then connected in parallel to two ends of the first resistor.
7. The storage battery pack voltage equalizing device according to claim 2, wherein the sampling comparison circuit further comprises a fourth diode and a twelfth resistor, and the fourth diode and the twelfth resistor are connected in series and then connected in parallel to two ends of the second resistor.
8. The battery pack voltage equalizing device according to any one of claims 3 and 5 to 7, wherein the turn-on voltages of the first diode, the second diode, the third diode and the fourth diode are all 0.5V.
9. The battery pack voltage equalizing apparatus according to claim 1, wherein the indication circuit further comprises: the cathode of the light-emitting diode is connected with one end of the thirteenth resistor, the anode of the light-emitting diode is used as the power supply end of the indicating circuit, and the other end of the thirteenth resistor is used as the control end of the indicating circuit.
10. The battery pack voltage equalizing device according to claim 1, wherein the first transistor, the second transistor, and the third transistor are of types 2N222, 2N3904, and 2N2906, respectively.
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| CN112531849B CN112531849B (en) | 2023-06-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116461387A (en) * | 2023-04-04 | 2023-07-21 | 常州汉姆智能科技有限公司 | Unmanned aerial vehicle battery serial connection charge balance circuit |
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| CN101425694A (en) * | 2008-12-10 | 2009-05-06 | 吕成学 | Equalized charging apparatus used for series batteries |
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| CN112039169A (en) * | 2020-09-22 | 2020-12-04 | 上海空间电源研究所 | Automatic equalization circuit of single storage battery |
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| CN101425694A (en) * | 2008-12-10 | 2009-05-06 | 吕成学 | Equalized charging apparatus used for series batteries |
| CN204068354U (en) * | 2014-08-12 | 2014-12-31 | 安徽安凯汽车股份有限公司 | A kind of electric automobile power battery charge and discharge balancing system |
| CN112039169A (en) * | 2020-09-22 | 2020-12-04 | 上海空间电源研究所 | Automatic equalization circuit of single storage battery |
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| CN112531849B (en) | 2023-06-20 |
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