WO2019019296A1

WO2019019296A1 - On-line checking discharge apparatus and method for storage battery set

Info

Publication number: WO2019019296A1
Application number: PCT/CN2017/101379
Authority: WO
Inventors: 方耿
Original assignee: 深圳市泰昂能源科技股份有限公司
Priority date: 2017-07-24
Filing date: 2017-09-12
Publication date: 2019-01-31
Also published as: CN107219470A; CN107219470B

Abstract

The present invention relates to the technical field of direct current (DC) power supplies, and provides an on-line checking discharge apparatus and method for a storage battery set. The apparatus comprises: a capacity checking module (10) and a capacity checking management module (11) which are communicationally connected to each other. The capacity checking module (10) comprises a DC/DC converter set (23) and a bypass unit (24) connected in parallel; in a non-capacity checking mode, the bypass unit (24) is switched on, and the DC/DC converter set (23) is in a non-working mode; in a capacity checking discharge mode, the bypass unit (24) is switched off, and the DC/DC converter set (23) is in a discharge mode; in a capacity checking charge mode, the bypass unit (24) is switched off, and the DC/DC converter set (23) is in a charge mode; after charging is completed, the DC/DC converter set (23) is switched off, and the bypass unit (24) is switched on; in the capacity checking mode and during voltage loss of a DC bus (22), the bypass unit (24) is automatically switched on according to a received signal so that a storage battery set (21) performs DC output. A storage battery does not disengage from the DC bus when discharging, and the discharge energy is fed back to a system DC load for supplying power.

Description

Battery pack online verification discharge device and method

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. CN201710610005X, entitled "Battery Set Online Verification Discharge Apparatus and Method", filed on July 24, 2017, the entire contents of which is incorporated herein by reference. in.

Technical field

The present invention relates to the field of DC power supply technologies, and in particular, to a battery pack online verification discharge device and method.

Background technique

The DC uninterruptible power supply system for substation or communication base station is the power supply guarantee for the safe operation of all DC loads of the entire substation or base station, and the battery pack is the core component. Once the AC voltage loss occurs, the battery pack becomes the supplier of all loads. Once the battery pack has a problem, the power supply system in the entire station will be paralyzed, causing equipment outages or even major operational accidents. When the DC system is in normal operation, the charger simultaneously supplies the battery pack and the normal load. Since the battery pack cannot be disconnected from the DC bus, it needs to be in a floating state, and long-term float charging may cause deterioration of the battery performance. Therefore, it is necessary to perform a verification discharge on the battery pack to determine whether there is a problem with the battery.

In the existing verification discharge technology, a group of battery packs needs to be disconnected from the DC bus. If an AC power loss occurs at this time, and another battery pack fails, the DC bus will be out of pressure and there is a safety hazard. At the same time, the energy of the discharge during the verification discharge is converted into heat energy consumption by the discharge instrument, resulting in great energy waste, and poor energy conservation and environmental protection.

In view of the safety hazard and energy waste in the prior art, there is no effective solution.

Summary of the invention

In view of this, an object of the present invention is to provide an online verification discharge device and method for a battery pack to reduce safety hazards during the discharge process and save power.

In a first aspect, an embodiment of the present invention provides an online verification discharge device for a battery pack, comprising a nuclear capacity module and a nuclear capacity management module for communication connection; the nuclear capacitance module is disposed between the battery group and the DC bus, and the nuclear capacity module is The battery pack and the DC bus are respectively electrically connected; the nuclear capacity management module is used to control the nuclear capacity module to work in the nuclear capacity mode or the non-nuclear capacity mode; the nuclear capacity mode includes a nuclear capacity discharge mode and a nuclear capacity charging mode; the nuclear capacity module includes a DC connected in parallel. /DC converter group and bypass unit; DC/DC converter group is used to realize charge and discharge conversion between battery pack and DC bus; in non-core mode, bypass unit is connected, DC/DC converter group is not working Mode; in the nuclear capacity discharge mode, the bypass unit is cut off, the DC/DC converter group is in the discharge mode; in the nuclear capacity charging mode, the bypass unit is cut off, and the DC/DC converter group is in the charging mode; after the charging is completed Turning off the DC/DC converter group and connecting the bypass unit; in the nuclear capacity mode and the DC bus is depressurized, the bypass unit automatically communicates according to the received signal to make the battery pack DC Out.

With reference to the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein, in the nuclear capacity mode and the AC voltage loss, the nuclear capacity management module determines the battery pack and other components in the nuclear capacity process. Whether the voltage difference of the battery pack in the nuclear capacity process is less than the parallel threshold; if less, the control bypass unit is connected; if not less, the bypass unit is kept off and the DC/DC converter group is controlled to switch to the non-operation mode.

With reference to the first aspect, or the first possible implementation manner of the first aspect, the embodiment of the present invention provides the second possible implementation manner of the first aspect, wherein the DC/DC converter group includes a bidirectional DC/DC Converter or independent DC/DC converter with two different directions.

With reference to the first aspect and one of the first and second possible implementation manners, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the bypass unit comprises a controllable switch and a control circuit; The circuit is connected to the nuclear management module for controlling the switchable or disconnected controllable switch according to the command of the nuclear management module.

With reference to the first aspect and one of the first, second, and third possible implementation manners, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the foregoing apparatus includes multiple nuclear capacity modules; The nuclear capacity modules are each connected to a battery pack.

With reference to the first aspect and one of the first, second, third, and fourth possible implementation manners, the embodiment of the present invention provides the fifth possible implementation manner of the first aspect, the battery pack online verification discharge device further includes: The patrol module is connected to the nuclear management module for sending a nuclear capacity command to the nuclear management module.

In conjunction with the first aspect and one of the first, second, third, fourth, and fifth possible implementation manners, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, the nuclear capacity module and the battery pack Each of the core modules is connected to one of the battery packs, and each of the core capacity modules is connected to the core capacity management module, and when the core capacity management module receives the nuclear capacity command, it alternates Each of the battery packs is subjected to nuclear capacity.

In conjunction with the first aspect and one of the first, second, third, fourth, fifth, and sixth possible implementation manners, the embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the DC bus connection is The DC load is maintained when the DC/DC converter group is switched to the discharge mode, and the battery pack is connected to the DC bus, and the discharge energy is fed back to the DC load.

In a second aspect, the embodiment of the present invention further provides an on-line verification discharge device for a battery pack, the method being applied to the battery-on-line verification discharge device provided in any one of the first aspect and the possible implementation manner thereof, the method comprising: When receiving the nuclear capacity command, the control bypass unit is turned off, and the DC/DC converter group is controlled to switch to the discharge mode; when the termination condition is reached, the control DC/DC converter group is switched to the charging mode; after the charging is completed, Control turns off the DC/DC converter bank and connects to the bypass unit.

In conjunction with the second aspect, an embodiment of the present invention provides a first possible implementation of the second aspect, the method further comprising: controlling a DC/DC converter group to discharge at a constant current during charging.

With reference to the second aspect, or the first possible implementation manner of the second aspect, the embodiment of the present invention provides the second party In a second possible implementation manner, the method further includes: controlling the bypass unit to communicate when the DC bus is depressurized during the nuclear capacity process, so that the battery pack performs DC output; and when the AC voltage loss occurs during the nuclear capacity process , determining whether the voltage difference between the battery pack in the nuclear capacity process and other battery packs not in the nuclear capacity process is less than the parallel threshold; if not, controlling the bypass unit to communicate; if not less, maintaining the bypass unit off and controlling The DC/DC converter group switches to the non-operation mode.

With reference to the second possible implementation manner of the second aspect, the embodiment of the present invention provides a third possible implementation manner of the second aspect, the performing the maintaining the bypass unit to cut off and controlling the DC/DC conversion After the step of switching to the non-working mode, the method further includes:

Continually monitoring whether a voltage difference between a battery pack connected to the DC/DC converter group switched to the non-operating mode and another battery pack not in the nuclear capacity process is less than the parallel threshold, and if less than the parallel threshold, Controlling the bypass unit to communicate.

With reference to the second aspect and one of the first, second and third possible implementation manners, the embodiment of the present invention provides a fourth possible implementation manner of the second aspect, the method further comprising: calculating and saving the battery pack capacity.

In conjunction with the second aspect and one of the second, third, and fourth possible implementation manners, the embodiment of the present invention provides a fifth possible implementation manner of the second aspect, where the parallel threshold is generated between multiple battery packs The threshold for the charging situation.

In conjunction with the second aspect and one of the first, second, third, fourth, and fifth possible implementation manners, the embodiment of the present invention provides a sixth possible implementation manner of the second aspect, where the termination condition includes a battery pack The voltage of the single cell is lower than 1.8 V, the entire set voltage of the battery pack is lower than N×1.8 V, the discharge time reaches a set value, and the discharge capacity reaches at least one of the set values.

With reference to the second aspect and one of the first, second, third, fourth, fifth, and sixth possible implementation manners, the embodiment of the present invention provides a seventh possible implementation manner of the second aspect, the nuclear capacity module and Each of the plurality of battery modules is connected to one of the battery packs, and each of the core capacity modules is connected to the core capacity management module. When the core capacity management module receives the nuclear capacity command Carrying out the nuclear capacity of each of the battery packs in turn.

In conjunction with the second aspect and one of the first, second, third, fourth, fifth, sixth, and seventh possible implementation manners, the embodiment of the present invention provides an eighth possible implementation manner of the second aspect, the DC bus A DC load is connected, and when the DC/DC converter group is switched to the discharge mode, the battery pack remains connected to the DC bus, and the discharge energy is fed back to the DC load.

In a third aspect, an embodiment of the present invention provides an online verification discharge device for a battery pack, including a nuclear capacity module and a nuclear capacity management module for communication connection;

The nuclear capacity module is electrically connected to the battery pack and the DC bus; the core capacity management module is configured to control the nuclear capacity module to work in a nuclear mode or a non-core mode; and the nuclear capacity mode includes a core a capacitive discharge mode and a nuclear charging mode; the nuclear capacitance module includes a parallel DC/DC converter group and a bypass unit; the DC/DC The converter group is configured to implement charging and discharging conversion between the battery pack and the DC bus;

In the non-core mode, the bypass unit is in communication, and the DC/DC converter group is in a non-operation mode;

In the nuclear capacity mode, the bypass unit is turned off, and the DC/DC converter group is in a discharge mode or a charging mode;

After the charging is completed, the DC/DC converter group is turned off and the bypass unit is connected.

With reference to the third aspect, the embodiment of the present invention provides a first possible implementation manner of the third aspect, in the nuclear capacity mode, when the DC bus is out of voltage, the bypass unit automatically connects according to the received signal. In order to make the battery pack perform DC output.

In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, where the readable storage medium stores program code, and the program code includes instructions that can be used to execute the foregoing method.

The embodiment of the present invention brings about the following beneficial effects: the online verification discharge device and method for the battery pack provided by the embodiment of the present invention, the nuclear capacity module and the nuclear capacity management module are added on the basis of the existing DC power supply system, wherein the nuclear capacity is The module includes a parallel DC/DC converter group and a bypass unit. In the non-core mode, the bypass unit is connected, the DC/DC converter group is in the non-operation mode; in the nuclear capacity discharge mode, the bypass unit is cut off, DC The /DC converter group is in the discharge mode; in the nuclear capacity charging mode, the bypass unit is turned off, the DC/DC converter group is in the charging mode; after the charging is completed, the DC/DC converter group is turned off and the bypass unit is connected; In the nuclear mode and the DC system has a power failure, the bypass unit automatically communicates according to the received signal, and realizes the fully automated control and management of the battery pack full-relay discharge of the DC system at a low cost, thereby reducing production and management costs. Realize online verification of battery discharge, and can accurately control the charge and discharge current, reduce the risk of verification discharge test, realize remotely or near-end automatic verification and charging of the battery. When the battery is discharged, it does not need to leave the DC bus, and the discharge energy is fed back. System DC load power supply, energy saving and environmental protection.

Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention are realized and attained by the invention particularly pointed in

The above described objects, features, and advantages of the invention will be apparent from the description and appended claims appended claims

DRAWINGS

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the specific embodiments or the description of the prior art will be briefly described below, and obviously, the attached in the following description The drawings are some embodiments of the present invention, and other drawings may be obtained from those of ordinary skill in the art without departing from the scope of the invention.

1 is a structural block diagram of an online verification discharge device for a battery pack according to an embodiment of the present invention;

2 is a schematic diagram of connection of a battery pack online verification discharge device according to an embodiment of the present invention;

3 is a flowchart of a method for online verification discharge of a battery pack according to an embodiment of the present invention;

FIG. 4 is a flowchart of another method for online verification discharge of a battery pack according to an embodiment of the present invention.

icon:

10-core capacity module; 11-core capacity management module; 21-battery pack; 22-DC bus; 23-DC/DC converter group; 24-bypass unit; 25-patrol module; 26-AC/DC charging Module; 27-DC load.

Detailed ways

The embodiments of the present invention will be clearly and completely described in detail with reference to the accompanying drawings. An embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

With the rapid development of the national economy and the continuous improvement of people's living standards, people have more and more demand for electricity, and the requirements for the continuous reliability of power supply are getting higher and higher. When the DC system is in normal operation, the charger simultaneously supplies the battery pack and the normal load. Since the battery pack cannot be separated from the DC bus, it needs to be in a floating state, but long-term float charging will cause the plate to be vulcanized and dehydrated, further aggravating the battery. Deterioration and shortened life. Only by verifying the discharge can the problem of the battery be found. According to the inspection regulations, the new battery will be checked every 2 to 3 years after being put into operation. It should be carried out once every year after 6 years of operation. At present, the battery brand and quality of the substation or base station are uneven, and may need to be operated after 2 to 3 years. There is a verification discharge every six months. There are more than 20,000 substations above 110kV in the country, and the number of mobile base stations in each province is more than 30,000. For example, a battery or a base station designed according to two sets of batteries can be used to verify the battery. The standard operation requires at least two operation and maintenance personnel to take 4 working days to complete. It is also necessary to transport the discharge instrument and other equipment to the site to maintain the workload. quite big.

At present, the technology for battery nuclear discharge is very backward, mainly has the following shortcomings:

1. The manual operation method adopted, the degree of automation is too low, and the work efficiency is extremely low.

2. The discharge test instrument is cumbersome, the field wiring is complicated and time-consuming, and it is easy to make mistakes. It is necessary to manually monitor the battery cell voltage in real time, which is easy to cause over-discharge of the unit and low reliability.

3. Taking two sets of battery packs as an example, a group of accumulating batteries need to be disconnected from the DC bus. If AC power loss occurs during the verification discharge, and another group of batteries fails, the DC bus will lose pressure and exist. Security risks.

4. The energy of discharge is converted into heat energy consumption by the discharge instrument. The discharge energy of the two groups of 104 2V/300Ah lead-acid batteries is 132kWh, which is equivalent to the electricity consumption of an ordinary household for two months. The energy lost by the battery against the discharge of the battery is more than one million kWh, and the energy saving and environmental protection are poor.

Based on this, the battery pack online verification discharge device and method provided by the embodiments of the present invention reduce the safety hazard in the discharge process and save power. In order to facilitate the understanding of the embodiment, a battery pack online verification discharge device disclosed in the embodiment of the present invention is first introduced in detail.

Example 1

Embodiment 1 of the present invention provides a battery pack online verification discharge device, and the battery group online verification discharge device is applied to a DC uninterruptible power supply system. Referring to the structural block diagram of the battery pack online verification discharge device shown in FIG. 1, the core capacity module 10 and the nuclear capacity management module 11 are included. The nuclear module 10 and the core management module 11 are in communication with each other.

Referring to the connection diagram of the battery pack online verification discharge device shown in FIG. 2, the nuclear capacity module 10 is disposed between the battery pack 21 and the DC bus 22, and the nuclear capacitor module 10 and the battery pack 21 and the DC bus 22 are shown. Electrically connected separately. The core capacity management module 11 is configured to control the nuclear capacity module 10 to operate in a nuclear mode or a non-core mode. Specifically, the nuclear capacity mode includes a nuclear discharge mode and a nuclear charge mode. The above non-core mode refers to the battery pack 21 being in the normal operating mode.

In this embodiment, the nuclear capacity module 10 is disposed between the battery pack 21 and the DC bus 22, which may refer to a physical relative position relationship. For example, the position of the nuclear capacity module 10 is located in the battery pack 21 and the DC. Between the bus bars 22. The nuclear module 10 is disposed between the battery pack 21 and the DC bus 22, and may only mean that the core module 10 is connected between the battery pack 21 and the DC bus 22, but the relative positions of the three are not limited in the physical sense.

The nuclear capacity module 10 includes a parallel DC/DC converter group 23 and a bypass unit 24; the DC/DC converter group 23 is used to implement charge and discharge conversion between the battery pack 21 and the DC bus 22 . The DC/DC converter group 23 can be a bidirectional DC/DC converter or two independent DC/DC converters (for charging and discharging, respectively).

In the non-core mode, the bypass unit 24 is in communication, the DC/DC converter group 23 is in the non-operation mode; in the nuclear capacity discharge mode, the bypass unit 24 is turned off, and the DC/DC converter group 23 is in the discharge mode; In the charging mode, the bypass unit 24 is turned off, the DC/DC converter group 23 is in the charging mode; after the charging is completed, the DC/DC converter group 23 is turned off and connected to the bypass unit 24; in the nuclear capacity mode and the DC bus 22 When the voltage is lost, the bypass unit 24 automatically communicates based on the received signal to cause the battery pack 21 to perform DC output.

The bypass unit 24 can receive a plurality of signals. For example, a voltage detecting unit can detect the voltage of the DC bus 22, and when the voltage detecting unit detects that the DC bus 22 is out of pressure, the voltage detecting unit sends the signal to the bypass unit 24. A trigger signal is automatically connected to the bypass unit 24 upon receipt of the trigger signal.

Depending on the location of the fault that occurs in the DC uninterruptible power system, DC bus 22 can be included in voltage loss and AC voltage loss. Since the DC uninterruptible power supply system usually includes at least two battery packs 21, when a battery pack 21 performs the nuclear capacity, if the DC bus 22 is out of pressure, it means that not only the AC power supply is partially faulty, but also other uncapacited battery packs 21 are In the event of a failure, the battery pack 21 of the current nuclear power is urgently required to be supplied with power. Therefore, regardless of whether the battery pack 21 is in a discharging or charging process, the bypass unit 24 needs to be immediately connected to perform DC output.

If the AC voltage loss occurs, the DC bus 22 is not under voltage, indicating that the AC power supply is partially faulty, but the other unqualified battery pack 21 can provide a DC output. At this time, the bypass unit of the battery pack 21 that communicates with the current nuclear capacity is connected. 24 make this When the battery pack 21 is connected in parallel with the other battery packs 21, two possible situations may occur: the battery pack 21 of the current core capacity is discharged or is charged by the other battery pack 21. In order to avoid the situation of being charged, the core management module 11 needs to determine whether the voltage difference between the current nuclear battery pack 21 and other battery packs 21 that are not in the nuclear capacity process is less than a parallel threshold, wherein the parallel threshold is a DC uninterruptible power supply. The threshold of the charging condition occurs between the plurality of battery packs 21, and less than the threshold, the charging does not occur. If it is less, the control bypass unit 24 is connected, so that the battery pack 21 of the current nuclear capacity is discharged; if not less, the battery is maintained. The bypass unit 24 is turned off and controls the DC/DC converter group 23 to switch to the non-operation mode, that is, the nuclear capacity process is stopped.

It can be understood that the core capacity management module 11 can continuously monitor the voltage difference between the battery packs 21. As the battery pack 21 discharges, the voltage difference will continuously decrease until it is less than the parallel threshold. The circuit unit 24 is connected to the battery pack 21 connected to the DC/DC converter group switched to the non-operating mode to be supplied in parallel.

Only two battery packs 21 are shown in FIG. 2, and two battery packs 21 are respectively connected to the nuclear capacity module 10, and a plurality of nuclear capacity modules 10 can be arranged according to the number of battery packs 21 actually included in the DC uninterruptible power supply system. Each of the battery modules 21 is connected to a battery pack 21, and when the nuclear capacity management module 11 receives the nuclear capacity command, the battery packs 21 are alternately charged.

Optionally, the bypass unit 24 of the nuclear module 10 includes a controllable switch and control circuitry. The control circuit is connected to the core capacity management module 11 for controlling the switchable or disconnected controllable switch according to the command of the core capacity management module 11.

In order to clarify the battery-on-line nuclear discharge device in the embodiment of the present invention, the nuclear capacity module 10 and the nuclear capacity management module 11 are added to the original DC uninterruptible power supply system in this embodiment. The nuclear module 10 includes a bidirectional DC/DC converter group 23 and a bypass unit 24, which is composed of a controllable switch and a control circuit, and the controllable switch includes a DC contactor or other controllable device. . The bidirectional DC/DC converter set 23 described above can effect charge and discharge power conversion between the battery pack 21 and the DC bus 22, and can be constructed by a basic Buck/Boost or other transform topology.

The core management module 11 can receive the command of the background monitoring system to determine whether to accumulate the battery pack 21, and the user can also perform manual capacity control according to actual conditions, and can also set an automatic timing approval plan. When the battery pack 21 is not in the nuclear capacity, that is, in the normal working state, the nuclear capacity management module 11 controls the nuclear capacity module 10 to operate in the bypass mode: the bypass unit 24, the bidirectional DC/DC converter group 23 does not work, and the DC The main monitoring of the uninterruptible power supply system performs charging management on the battery pack 21.

When the nuclear capacity management module 11 receives the nuclear capacity command, the two battery packs 21 are polled in turn to improve the safety of the entire DC uninterruptible power supply system and reduce the risk of the verification discharge test. When the battery pack 21 is subjected to the nuclear capacity, the online discharge mode is adopted, the battery pack 21 is kept connected to the DC bus 22, the DC bus 22 is connected with the DC load 27, and the discharge energy is fed back to the DC uninterruptible power supply system DC load 27 for power supply, energy saving and environmental protection. .

For example, first, the battery pack 21 connected to the nuclear capacity module I is subjected to nuclear capacity, the bypass unit 24 of the nuclear capacity module I is first turned off, the bidirectional DC/DC converter group 23 is activated, and the bidirectional DC/DC converter group 23 is operated to discharge. Mode, in this case, the nuclear capacity module I discharges the DC bus 22, and the power of the battery pack 21 connected to the nuclear capacity module I is supplied with a DC load 27, thereby avoiding unnecessary energy waste. Alternatively, the discharge current of the battery pack 21 can be accurately controlled by controlling the output power of its internal DC/DC, so that the battery pack 21 is discharged at a constant current, and the discharge is automatically stopped according to the set termination condition. In general, there are four termination conditions: the voltage of the single cell in the battery pack 21 is lower than 1.8V, the whole set voltage is lower than N x 1.8V, the discharge time reaches the set value, and the discharge capacity reaches the set value. According to actual needs, it may be set to stop discharging when any one of the above four termination conditions is satisfied, or to stop discharging when a combination of any of the above four termination conditions is satisfied.

After the termination condition is satisfied, it is determined that the discharge is completed. At this time, the nuclear module I is switched to the charging mode, and the DC bus 22 is taken to charge the battery pack 21 connected thereto. After the charging is completed, the bidirectional DC/DC converter group 23 is turned off, and the bypass unit 24 is closed. The nuclear module I is re-switched to the bypass mode, and the battery pack 21 connected to the core module I is terminated. At the same time, the capacity of the battery pack 21 can be calculated according to the existing calculation method. After the capacity of the battery pack 21 is obtained, it can be determined whether the battery pack 21 has an aging problem, and then whether maintenance is performed. The core management module 11 can receive and save the battery pack 21 core data and results. After the battery pack 21 connected to the nuclear module I is completed, the battery pack 21 connected to the nuclear module II is subjected to the above process. Since the process of accommodating the battery pack 21 connected to the nuclear capacity module II and the process of accommodating the battery pack 21 connected to the nuclear capacity module I are similar, they are not described herein.

In the online verification discharge process of the battery pack 21, if a power failure occurs in an AC or DC bus undervoltage, the nuclear capacity module 10 connected thereto is automatically switched to the bypass operation mode, and the DC output of the DC uninterruptible power supply system is safe and reliable. The method for monitoring whether the DC uninterruptible power supply system has a power supply fault is in the prior art, and is not described here. Through the above device, the battery pack 21 can realize full online automatic verification discharge, which can completely replace the existing battery pack 21 manual nuclear capacity work of the DC uninterruptible power supply system, greatly reduce the operation and maintenance cost of the DC uninterruptible power supply system, and improve production efficiency and safety. Effectively returning the energy discharged by the battery pack 21, the national power station and the base station can save tens of millions of kilowatt-hours of energy per year, while saving energy is also slowing energy consumption, and energy saving and environmental protection is good.

Also shown in FIG. 2 is a patrol module 25, which is in communication with the nucleus management module 11 for transmitting a nuclear capacity command to the nucleus management module 11. At the same time, the inspection module 25 can also receive status information of the battery pack 21. Also shown in FIG. 2 is an AC/DC charging module 26, which is also connected to a DC bus 22 to which the DC load 27 is connected.

The battery pack online verification discharge device provided by the embodiment of the invention adds the nuclear capacity module 10 and the nuclear capacity management module 11 to the existing DC uninterruptible power supply system, wherein the nuclear capacitance module 10 includes parallel DC/DC conversion. Group 23 and bypass unit 24, in the non-nuclear mode, the bypass unit 24 is connected, and the DC/DC converter group 23 is in the non-nuclear mode Operating mode. In the nuclear discharge mode, the bypass unit 24 is turned off and the DC/DC converter group 23 is in the discharge mode. In the nuclear charging mode, the bypass unit 24 is turned off and the DC/DC converter group 23 is in the charging mode. After the charging is completed, the DC/DC converter group 23 is turned off and the bypass unit 24 is connected. In the nuclear mode and the power failure of the DC uninterruptible power supply system, the bypass unit 24 automatically communicates based on the received signal. The low-cost realization of the fully automated control and management of the battery pack 21 of the DC uninterruptible power supply system reduces the production and management costs, realizes the online verification discharge of the battery pack 21, and can accurately control the charge and discharge current and reduce the verification discharge. Test risk, to achieve remote or near-end automatic verification and charging of the battery pack 21, the battery pack 21 does not need to leave the DC bus 22 when discharging, the discharge energy feedback to the DC uninterruptible power supply system DC load 27 power supply, energy saving and environmental protection.

Example 2

Embodiment 2 of the present invention provides a method for online verification discharge of a battery pack, and a flowchart of the online verification discharge method of the battery pack shown in FIG. 3 is applied to the online verification discharge device of the battery pack provided in Embodiment 1 above. The method comprises the following steps:

Step S31, when receiving the nuclear capacity command, the control bypass unit is turned off, and the DC/DC converter group is controlled to switch to the discharge mode.

Step S32, when the termination condition is reached, the DC/DC converter group is controlled to switch to the charging mode.

For specific termination conditions, reference may be made to the content of Embodiment 1 above.

In step S33, after the charging is completed, the DC/DC converter group is controlled to be turned off and connected to the bypass unit.

After the charging is completed, the nuclear module is re-switched to the bypass mode.

Further, referring to the flowchart of the online verification discharge method of the battery pack shown in FIG. 4, the method further includes: Step S41, controlling the bypass unit to communicate when the DC bus is out of pressure during the nuclear capacity process, so that the battery pack is DC. Output.

When the AC voltage loss occurs during the nuclear capacity process, it is judged whether the voltage difference between the battery pack in the nuclear capacity process and other battery packs not in the nuclear capacity process is less than the parallel threshold. If it is less than, the control bypass unit is connected; if not less than Then, the bypass unit is kept off and the DC/DC converter group is controlled to switch to the non-operation mode.

The parallel threshold is a threshold for charging between a plurality of battery packs.

Optionally, after performing the step of maintaining the bypass unit to cut off and controlling the DC/DC converter group to switch to the non-operation mode, the method further includes:

Optionally, the nuclear capacity module and the battery pack are multiple, each of the nuclear capacity modules is respectively connected to one of the battery packs, and each of the nuclear capacity modules is connected to the nuclear capacity management module. The core management module receives When the command is issued, each of the battery packs is polled in turn.

Further, the above method further comprises: controlling the DC/DC converter group to discharge at a constant current during the charging process. Further, the above method further comprises: calculating and saving the capacity of the battery pack.

Optionally, the DC bus is connected with a DC load. When the DC/DC converter group is switched to the discharge mode, the battery pack is connected to the DC bus, and the discharge energy is fed back to the DC load.

In the online verification discharge method of the battery pack provided by the embodiment of the invention, when receiving the nuclear capacity command, the control bypass unit is cut off, and the DC/DC converter group is controlled to switch to the discharge mode. When the termination condition is reached, the control DC/DC converter group is switched to the charging mode. After the charging is completed, the DC/DC converter group is controlled to be closed and connected to the bypass unit, which can automatically control and manage the battery pack full-relay discharge, realize online verification discharge, and can accurately control the charge and discharge current and reduce the verification discharge test. risk. At the same time, it does not need to leave the DC bus during discharge, and the discharge energy is fed back to the DC uninterruptible power supply system for DC load power supply, which is energy-saving and environmentally friendly.

The online verification discharge method of the battery pack provided by the embodiment of the invention has the same technical features as the online verification discharge device of the battery pack provided by the above embodiments, so that the same technical problem can be solved and the same technical effect can be achieved.

Example 3

Embodiment 3 of the present invention provides an online verification discharge device for a battery pack, comprising a nuclear connection module and a nuclear capacity management module for communication connection; the nuclear capacitance module is electrically connected to the battery pack and the DC bus; The core capacity management module is configured to control the nuclear capacity module to operate in a nuclear capacity mode or a non-core capacity mode; the nuclear capacity mode includes a nuclear capacity discharge mode and a nuclear capacity charging mode; and the nuclear capacitance module includes a parallel DC/DC a converter group and a bypass unit; the DC/DC converter group is configured to implement charge and discharge conversion between the battery pack and the DC bus; in the non-core mode, the bypass unit is connected The DC/DC converter group is in a non-operating mode; in the nuclear capacity mode, the bypass unit is turned off, the DC/DC converter group is in a discharging mode or a charging mode; after charging is completed, the DC The /DC converter bank is turned off and the bypass unit is in communication.

In the nuclear capacity mode and the DC bus is depressurized, the bypass unit automatically communicates according to the received signal to cause the battery pack to perform DC output.

On the basis of the above, the embodiment of the present invention further provides a computer program product for a battery pack online verification discharge device and method, comprising a computer readable storage medium storing program code, and the program code includes instructions for executing the foregoing method embodiment. For the specific implementation, refer to the method embodiment, and details are not described herein again.

In addition, in the description of the embodiments of the present invention, the terms "installation", "connected", and "connected" are to be understood broadly, and may be a fixed connection or a detachable connection, unless otherwise explicitly defined and defined. , or connected integrally; may be mechanical connection or electrical connection; may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements. For those skilled in the art, the above terms can be understood in the specific case. The specific meaning of Ming.

The above functions, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

It should be noted that the above embodiments are merely specific embodiments of the present invention for explaining the technical solutions of the present invention, and are not limited thereto, and the scope of protection of the present invention is not limited thereto, although the foregoing embodiments are referred to. The present invention has been described in detail, and those skilled in the art should understand that any one skilled in the art can still modify the technical solutions described in the foregoing embodiments or can easily think of the technical solutions disclosed in the foregoing embodiments. Variations, or equivalents to some of the technical features, and the modifications, variations, or substitutions are not intended to depart from the spirit and scope of the technical solutions of the embodiments of the present invention. Inside. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Industrial applicability

The online verification discharge device and method for the battery pack provided by the embodiment of the invention realizes the full automatic control and management of the battery pack full-review discharge of the DC uninterruptible power supply system at a low cost, reduces the production and management costs, and realizes the online verification of the battery pack. Sexual discharge, and can accurately control the charge and discharge current, reduce the risk of the verification discharge test, realize the remote or near-end automatic verification and charging of the battery pack automatically, the battery pack does not need to leave the DC bus when discharging, and the discharge energy is fed back to DC. Intermittent power supply system DC load power supply, energy saving and environmental protection.

Claims

An online verification discharge device for a battery pack, comprising: a nuclear capacity module and a nuclear capacity management module;

The nuclear capacity module is disposed between the battery pack and the DC bus, the nuclear capacity module is electrically connected to the battery pack and the DC bus, respectively; the nuclear capacity management module is configured to control the nuclear capacity module to operate a nuclear mode or a non-nuclear mode; the nuclear mode includes a nuclear discharge mode and a nuclear charge mode; the nuclear capacitance module includes a parallel DC/DC converter group and a bypass unit; and the DC/DC converter The group is configured to implement a charge and discharge conversion between the battery pack and the DC bus;

In the non-core mode, the bypass unit is in communication, and the DC/DC converter group is in a non-operation mode;

In the nuclear capacity discharge mode, the bypass unit is turned off, and the DC/DC converter group is in a discharge mode;

In the nuclear capacity charging mode, the bypass unit is turned off, the DC/DC converter group is in a charging mode; after charging is completed, the DC/DC converter group is turned off and the bypass unit is connected;

In the nuclear capacity mode and the DC bus is depressurized, the bypass unit automatically communicates according to the received signal to cause the battery pack to perform DC output.
The device of claim 1 wherein:

In the nuclear capacity mode and the AC voltage loss, the nuclear capacity management module determines whether the voltage difference between the battery pack in the nuclear capacity process and other battery packs not in the nuclear capacity process is less than the parallel threshold; if less, the control The bypass unit is in communication; if not less, the bypass unit is kept off and the DC/DC converter group is controlled to switch to the inactive mode.
The apparatus according to claim 1 or 2, wherein said DC/DC converter group comprises a bidirectional DC/DC converter or two independent DC/DC converters of different directions.
The device according to any one of claims 1 to 3, wherein the bypass unit comprises a controllable switch and a control circuit; the control circuit is connected to the nuclear capacity management module, and configured to be according to the core The command of the capacity management module controls the controllable switch to be disconnected or connected.
The apparatus according to any one of claims 1 to 4, wherein said apparatus comprises a plurality of said nuclear capacity modules; each of said nuclear capacitance modules is respectively connected to one of said battery packs.
The device according to any one of claims 1 to 5, wherein the device further comprises: a patrol module; the patrol module is communicably connected to the nucleus management module, and configured to be to the nucleus The management module sends a nuclear command.
The device according to any one of claims 1 to 6, wherein the nuclear capacity module and the battery pack are plural, and each of the nuclear capacitance modules is respectively connected to one of the battery packs, and the cores are respectively Capacitor module and the core The capacity management module is connected, and when the nuclear capacity management module receives the nuclear capacity command, the battery packs are respectively polled.
The apparatus according to any one of claims 1 to 7, wherein said DC bus is connected with a DC load, said battery pack and said DC when said DC/DC converter group is switched to a discharge mode The busbar remains connected and the discharge energy is fed back to the DC load.
An on-line verification discharge device for a battery pack, characterized in that the method is configured as the online verification discharge device for a battery pack according to any one of claims 1-8, the method comprising:

When receiving the nuclear capacity command, the control bypass unit is turned off, and the DC/DC converter group is controlled to switch to the discharge mode;

Controlling the DC/DC converter group to switch to the charging mode when the termination condition is reached;

After the charging is completed, the control turns off the DC/DC converter group and communicates with the bypass unit.
The method of claim 9 wherein the method further comprises:

During the charging process, the DC/DC converter group is controlled to discharge at a constant current.
The method according to claim 9 or 10, wherein the method further comprises:

Controlling the bypass unit to communicate when the DC bus is depressurized during the nuclear capacity process, so that the battery pack performs DC output;

When the AC voltage loss occurs during the nuclear capacity process, it is determined whether the voltage difference between the battery pack in the nuclear capacity process and other battery packs not in the nuclear capacity process is less than the parallel threshold; if less, the bypass unit is controlled to communicate; Not less than, the bypass unit is kept off and the DC/DC converter group is controlled to switch to the inactive mode.
The method according to claim 11, wherein after performing the step of maintaining the bypass unit off and controlling the DC/DC converter group to switch to the non-operation mode, the method further comprises:

Continually monitoring whether a voltage difference between a battery pack connected to the DC/DC converter group switched to the non-operating mode and another battery pack not in the nuclear capacity process is less than the parallel threshold, and if less than the parallel threshold, Controlling the bypass unit to communicate.
The method according to any one of claims 9 to 12, wherein the method further comprises:

Calculate and save the capacity of the battery pack.
The method according to any one of claims 11 to 13, wherein the parallel threshold is a threshold value of a charging situation occurring between a plurality of battery packs.
The method according to any one of claims 9 to 14, wherein the termination condition comprises a voltage of a single battery in the battery pack being lower than 1.8V, a whole set voltage of the battery pack being lower than N x 1.8V, and discharging The time reaches the set value and the release capacity reaches at least one of the set values.
The method according to any one of claims 9 to 15, wherein the nuclear capacity module and the battery pack Each of the core modules is connected to one of the battery packs, and each of the core capacity modules is connected to the core capacity management module, and when the core capacity management module receives the nuclear capacity command, it alternates Each of the battery packs is subjected to nuclear capacity.
The method according to any one of claims 9 to 16, wherein the DC bus is connected with a DC load, and the battery pack and the DC when the DC/DC converter group is switched to the discharge mode. The busbar remains connected and the discharge energy is fed back to the DC load.
An online verification discharge device for a battery pack, comprising: a nuclear capacity module and a nuclear capacity management module;

The nuclear capacity module is electrically connected to the battery pack and the DC bus; the core capacity management module is configured to control the nuclear capacity module to operate in a nuclear mode or a non-core mode; the nuclear capacity mode includes a core a capacitive discharge mode and a nuclear charging mode; the nuclear capacitance module includes a parallel DC/DC converter group and a bypass unit; the DC/DC converter group is configured to implement between the battery pack and the DC bus Charge and discharge conversion;

In the non-core mode, the bypass unit is in communication, and the DC/DC converter group is in a non-operation mode;

In the nuclear capacity mode, the bypass unit is turned off, and the DC/DC converter group is in a discharge mode or a charging mode;

After the charging is completed, the DC/DC converter group is turned off and the bypass unit is connected.
The battery pack online verification discharge device according to claim 18, wherein in the nuclear capacity mode and the DC bus is depressurized, the bypass unit automatically communicates according to the received signal, so as to The battery pack performs DC output.
A computer readable storage medium storing program code, the program code comprising instructions configurable to perform the method of any one of claims 9-17.