CN111092471B - Using method of overcharge and overdischarge protection circuit for energy storage battery pack - Google Patents
Using method of overcharge and overdischarge protection circuit for energy storage battery pack Download PDFInfo
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- CN111092471B CN111092471B CN201911385246.4A CN201911385246A CN111092471B CN 111092471 B CN111092471 B CN 111092471B CN 201911385246 A CN201911385246 A CN 201911385246A CN 111092471 B CN111092471 B CN 111092471B
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- battery pack
- energy storage
- storage battery
- contactor
- control module
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a use method of an overcharge and overdischarge protection circuit for an energy storage battery pack, which comprises the steps of judging the electric quantity of the energy storage battery pack and a state signal of a power grid end through a control module, controlling a discharge detection loop or a charge detection loop in a detection loop to be conducted, judging a signal of a current sensor, supplying power to a power grid end or charging the energy storage battery pack, effectively avoiding the overcharge or overdischarge of the energy storage battery pack, and effectively prolonging the service life of the energy storage battery pack.
Description
Technical Field
The invention relates to a high-voltage system of an energy storage power station, in particular to a use method of an overcharge and overdischarge protection circuit for an energy storage battery pack.
Background
In recent years, as an emerging power supply system, the popularity of energy storage power stations is continuously increasing. The energy storage battery pack is an important component of the energy storage power station, the energy storage power station is used for providing energy output under the condition that the power grid end is powered off, but the service life of the battery pack is shortened due to overcharge and overdischarge of the battery pack, and in order to prolong the service life of the battery pack, the battery pack is reasonably subjected to charge and discharge protection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a use method of an overcharge and overdischarge protection circuit for an energy storage battery pack, which is used for protecting the service life of the battery pack.
The application method of the overcharge and overdischarge protection circuit for the energy storage battery pack comprises the following steps:
step one, connecting a high-voltage circuit, wherein the specific connection circuit is as follows: the positive electrode of the energy storage battery pack end is sequentially connected with the fuse, the detection circuit, the power grid use end, the third contactor, the current sensor and the negative electrode of the energy storage battery pack end through a high-voltage cable to form a high-voltage power utilization circuit, and the energy storage battery pack end is used for outputting standby electric energy;
the detection circuit comprises a discharge detection circuit and a charge detection circuit, the discharge detection circuit is formed by sequentially connecting a fuse cathode, a first contactor, a resistor, a rectifying tube module right side diode and an anode of a power grid using end by a high-voltage cable, the rectifying tube module comprises a left side diode and a right side diode, and the anodes of the left side diode and the right side diode are connected by a lead;
the charging detection loop is formed by sequentially connecting a positive electrode of a power grid use end, a second contactor, a resistor, a diode on the left side of a rectifying tube module, a positive electrode of a fuse and a positive electrode of an energy storage battery pack by a high-voltage cable;
a control module is respectively connected with signal input ends of all the electric elements in the high-voltage power utilization loop through control wires, and the discharge detection loop and the charge detection loop are controlled through the control module;
if the voltage of the power grid using end normally supplies power and the battery pack electric quantity of the energy storage battery pack end is more than 90%, the control module outputs a control signal to enable the first contactor to be in a closed state, the second contactor is in an open state, the third contactor is in a closed state, and the discharge detection loop in the high-voltage power utilization loop is conducted;
if the control module receives a power-off state signal of the power grid using end, the energy storage battery pack supplies power to the power grid using end, the first contactor and the third contactor are in a closed state, the discharge detection loop in the high-voltage power utilization loop is conducted in a discharge-only state, and when the current sensor detects discharge current, the control module outputs a closed signal to the second contactor according to the signal output by the read current sensor, so that the high-voltage power utilization loop is in a high-current discharge state;
when the electric quantity of the energy storage battery pack is monitored by the control module to be lower than 5% in the discharging process, the control module outputs an opening signal to the first contactor, the charging detection loop enables the energy storage battery pack to be charged only, when the current sensor detects charging current in the waiting process, the control module outputs a closing signal to the first contactor according to the signal output by the read current sensor to charge the energy storage battery pack with large current, when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs an opening signal to the second contactor according to the read electric quantity of the energy storage battery pack, the energy storage battery pack is not charged any more, and the discharging detection loop in the high-voltage electricity utilization loop is conducted;
in the self-discharging process of the energy storage battery pack, if the control module detects that the electric quantity of the energy storage battery pack is below 90%, an opening signal is output to the first contactor, a closing signal is output to the second contactor, the charge detection circuit in the high-voltage power utilization circuit is conducted and is in a charging state only, when the current sensor detects charging current, the control module outputs the closing signal to the first contactor according to the read signal output by the current sensor, the energy storage battery pack is charged with large current, and when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs the opening signal to the second contactor, so that the discharge detection circuit in the high-voltage power utilization circuit is conducted.
The method has the beneficial effects that: the method combines the control method of the contactor with the unidirectional conductivity of the diode to effectively protect the use safety and the service life of the battery pack. In general, a battery pack of an energy storage power station is connected in parallel with a power grid using end for a long time, and in order to prevent the battery pack from being overcharged and overdischarged, the service life of the battery pack is protected by monitoring the electric quantity of the battery pack and closing the sequence of contactors.
Drawings
Fig. 1 is a schematic diagram of a method for using an overcharge and overdischarge protection circuit for an energy storage battery pack according to the present invention.
Detailed Description
The invention is further illustrated by the following specific examples with reference to fig. 1:
as shown in fig. 1, the application method of the overcharge and overdischarge protection circuit for the energy storage battery pack of the invention comprises the following steps:
step one, connecting a high-voltage circuit, wherein the specific connection circuit is as follows: the positive electrode of the energy storage battery pack end is sequentially connected with the fuse, the detection circuit, the power grid use end, the third contactor S3, the current sensor and the negative electrode of the energy storage battery pack end through a high-voltage cable to form a high-voltage power utilization circuit, and the energy storage battery pack end is used for outputting standby electric energy;
the detection circuit comprises a discharge detection circuit and a charge detection circuit, the discharge detection circuit is formed by sequentially connecting a fuse cathode, a first contactor S1, a resistor, a rectifying tube module right side diode and an anode of a power grid using end by a high-voltage cable, the rectifying tube module comprises a left side diode and a right side diode, and the anodes of the left side diode and the right side diode are connected by a lead;
the charging detection loop is formed by sequentially connecting a positive electrode of a power grid use end, a second contactor S2, a resistor, a diode on the left side of a rectifying tube module, a positive electrode of a fuse and a positive electrode of an energy storage battery pack by a high-voltage cable.
A control module is respectively connected with signal input ends of all the electric elements in the high-voltage power utilization loop through control wires, and the discharge detection loop and the charge detection loop are controlled through the control module.
And step two, if the voltage of the power grid using end normally supplies power and the battery pack electric quantity of the energy storage battery pack end is more than 90%, the control module outputs a control signal to enable the first contactor S1 to be in a closed state, the second contactor S2 to be in an open state, the third contactor S3 to be in a closed state, and the discharge detection loop in the high-voltage power utilization loop is conducted.
If the control module receives a power-off state signal of the power grid using end, the energy storage battery pack supplies power to the power grid using end, the first contactor S1 and the third contactor S3 are in a closed state, the discharge detection loop in the high-voltage power utilization loop is conducted and is in a discharge-only state, and when the current sensor detects discharge current, the control module outputs a closed signal to the second contactor S2 according to a signal output by the read current sensor, so that the high-voltage power utilization loop is in a high-current discharge state;
when the electric quantity of the energy storage battery pack is monitored by the control module to be lower than 5% in the discharging process, the control module outputs an opening signal to the first contactor S1, the charging detection loop enables the energy storage battery pack to be charged only, when the current sensor detects charging current in the waiting process, the control module outputs a closing signal to the first contactor S1 according to the signal output by the read current sensor to charge the energy storage battery pack with large current, when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs an opening signal to the second contactor S2 according to the read electric quantity of the energy storage battery pack, the energy storage battery pack is not charged any more, and the discharging detection loop in the high-voltage electricity utilization loop is conducted.
In the self-discharging process of the energy storage battery pack, if the control module detects that the electric quantity of the energy storage battery pack is below 90%, an opening signal is output to the first contactor S1, a closing signal is output to the second contactor S2, the charge detection circuit in the high-voltage power utilization circuit is conducted and is in a charging state only, when the current sensor detects a charging current, the control module outputs the closing signal to the first contactor S1 according to the read signal output by the current sensor, the energy storage battery pack is charged with large current, and when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs the opening signal to the second contactor S2, so that the discharge detection circuit in the high-voltage power utilization circuit is conducted.
Claims (1)
1. The application method of the overcharge and overdischarge protection circuit for the energy storage battery pack is characterized by comprising the following steps of:
step one, connecting a high-voltage circuit, wherein the specific connection circuit is as follows: the positive electrode of the energy storage battery pack end is sequentially connected with the fuse, the detection circuit, the power grid use end, the third contactor, the current sensor and the negative electrode of the energy storage battery pack end through a high-voltage cable to form a high-voltage power utilization circuit, and the energy storage battery pack end is used for outputting standby electric energy;
the detection circuit comprises a discharge detection circuit and a charge detection circuit, the discharge detection circuit is formed by sequentially connecting a fuse cathode, a first contactor, a resistor, a rectifying tube module right side diode and an anode of a power grid using end by a high-voltage cable, the rectifying tube module comprises a left side diode and a right side diode, and the anodes of the left side diode and the right side diode are connected by a lead;
the charging detection loop is formed by sequentially connecting a positive electrode of a power grid use end, a second contactor, a resistor, a diode on the left side of a rectifying tube module, a positive electrode of a fuse and a positive electrode of an energy storage battery pack by a high-voltage cable;
a control module is respectively connected with signal input ends of all the electric elements in the high-voltage power utilization loop through control wires, and the discharge detection loop and the charge detection loop are controlled through the control module;
if the voltage of the power grid using end normally supplies power and the battery pack electric quantity of the energy storage battery pack end is more than 90%, the control module outputs a control signal to enable the first contactor to be in a closed state, the second contactor is in an open state, the third contactor is in a closed state, and the discharge detection loop in the high-voltage power utilization loop is conducted;
if the control module receives a power-off state signal of the power grid using end, the energy storage battery pack supplies power to the power grid using end, the first contactor and the third contactor are in a closed state, the discharge detection loop in the high-voltage power utilization loop is conducted in a discharge-only state, and when the current sensor detects discharge current, the control module outputs a closed signal to the second contactor according to the signal output by the read current sensor, so that the high-voltage power utilization loop is in a high-current discharge state;
when the electric quantity of the energy storage battery pack is monitored by the control module to be lower than 5% in the discharging process, the control module outputs an opening signal to the first contactor, the charging detection loop enables the energy storage battery pack to be charged only, when the current sensor detects charging current in the waiting process, the control module outputs a closing signal to the first contactor according to the signal output by the read current sensor to charge the energy storage battery pack with large current, when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs an opening signal to the second contactor according to the read electric quantity of the energy storage battery pack, the energy storage battery pack is not charged any more, and the discharging detection loop in the high-voltage electricity utilization loop is conducted;
in the self-discharging process of the energy storage battery pack, if the control module detects that the electric quantity of the energy storage battery pack is below 90%, an opening signal is output to the first contactor, a closing signal is output to the second contactor, the charge detection circuit in the high-voltage power utilization circuit is conducted and is in a charging state only, when the current sensor detects charging current, the control module outputs the closing signal to the first contactor according to the read signal output by the current sensor, the energy storage battery pack is charged with large current, and when the electric quantity of the energy storage battery pack reaches 100%, the control module outputs the opening signal to the second contactor, so that the discharge detection circuit in the high-voltage power utilization circuit is conducted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911385246.4A CN111092471B (en) | 2019-12-28 | 2019-12-28 | Using method of overcharge and overdischarge protection circuit for energy storage battery pack |
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| CN201911385246.4A CN111092471B (en) | 2019-12-28 | 2019-12-28 | Using method of overcharge and overdischarge protection circuit for energy storage battery pack |
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| CN112383119A (en) * | 2020-12-02 | 2021-02-19 | 珠海格力电器股份有限公司 | Method for preventing energy storage system from over-discharging and energy storage system |
| CN114156971A (en) * | 2021-11-10 | 2022-03-08 | 珠海格力电器股份有限公司 | Energy storage charging and discharging control method, device and equipment and energy storage system |
Citations (3)
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| JPH0946925A (en) * | 1995-08-01 | 1997-02-14 | Japan Storage Battery Co Ltd | Distributed power unit |
| CN204668986U (en) * | 2015-04-23 | 2015-09-23 | 广州智光电机有限公司 | A kind of battery charging and discharging device |
| CN109245189A (en) * | 2017-07-10 | 2019-01-18 | 中兴通讯股份有限公司 | A kind of battery management system and a kind of circuit for battery set charge/discharge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6196466B2 (en) * | 2013-05-10 | 2017-09-13 | Fdk株式会社 | Power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0946925A (en) * | 1995-08-01 | 1997-02-14 | Japan Storage Battery Co Ltd | Distributed power unit |
| CN204668986U (en) * | 2015-04-23 | 2015-09-23 | 广州智光电机有限公司 | A kind of battery charging and discharging device |
| CN109245189A (en) * | 2017-07-10 | 2019-01-18 | 中兴通讯股份有限公司 | A kind of battery management system and a kind of circuit for battery set charge/discharge |
Non-Patent Citations (1)
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| 蔚兰.一种新型智能铅酸蓄电池充/ 放电装置的设计.蓄电池.2008,(第4期),1-4. * |
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