A discharge system for battery nuclear containment

Abstract

The application discloses a kind of discharging systems for battery nuclear capacity, specifically relates to battery nuclear capacity field, and its technical key points are: including discharging module, charging module, standby power module and control processing module;Discharging module is used for the discharge operation of battery nuclear capacity, charging module is used to charge for standby power module, standby power module is used to provide electrical energy when the voltage loss of external DC bus, control processing module is used to output control instruction control discharging module, charging module and standby power module run;One end of discharging module is connected with the discharge end of external battery pack through discharging cable, the other end of discharging module is connected with one end of charging module, the other end of charging module away from discharging module is connected with one end of standby power module, the other end of standby power module is connected with external DC bus through standby power cable;First detection module is provided in external battery pack, second detection module is provided in discharging module.

Description

Technical Field

[0001] The present invention relates to the field of battery core capacity, and in particular to a discharge system for battery core capacity. Background Art

[0002] Batteries, as energy storage devices, play a vital role in many fields, such as power systems and communications. The primary purpose of battery capacity verification is to accurately determine the battery's actual capacity and ensure it can reliably provide power when needed. Specifically, this involves verifying whether the battery's performance meets requirements and determining whether it can continuously power the load within the specified timeframe. It also ensures that any issues with battery aging or damage are promptly identified to facilitate maintenance or replacement, ensuring stable system operation.

[0003] The battery capacity verification of the DC power supply system of the substation mainly adopts offline verification. In the offline verification process, if the DC power supply system of the substation is only equipped with one battery group, the battery group cannot be shut down, so the full capacity verification discharge cannot be performed. Only I 10 The current (10-hour rate discharge current) is discharged at 50% of the rated capacity for evaluation, which cannot truly test the actual capacity of the current battery pack; if a full-capacity verification discharge is performed, a DC power emergency system or a backup battery pack must be connected, which is cumbersome and complicated. At the same time, during the full-capacity verification discharge of the battery, if the station's AC power supply or rectifier module fails and there is no load capacity for DC load, the verified battery pack cannot quickly exit the verification discharge and cannot be instantly put into the DC bus as a backup power supply, and the DC load in the station is at risk of power failure.

[0004] Therefore, the present invention aims to provide a discharge system for battery core capacity to solve the above-mentioned related problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the full-capacity verification discharge operation in the existing technology is relatively cumbersome, and the battery pack under verification cannot quickly exit the verification discharge, and cannot be instantly put into the DC bus as a backup power supply, and the DC load in the station is at risk of power failure. The purpose is to provide a discharge system for battery verification, by using the charging module to charge the backup power module with the electric energy output by the battery pack at the initial stage of discharge, and then controlling the discharge of the battery pack by using the discharge module after the backup power module is charged; at the same time, by setting the backup power module to be connected to the battery pack through the backup power cable, when the station AC power supply or rectifier module fails, resulting in no load DC load capacity, the backup power module can continuously put the backup current into the DC bus; at the same time, when the battery fails to discharge at half capacity, after connecting to the backup module, the full-capacity discharge can be continued; at the same time, through the first detection module and the second detection module, the battery pack and each module of the discharge system are monitored and data is collected and input into the control processing module. The control processing module automatically controls the entire discharge system by judging the collected data information and combining the control instructions input by the staff.

[0006] The present invention is achieved through the following technical solutions:

[0007] A discharge system for battery capacity verification, the discharge system comprising a discharge module, a charging module, a backup power module and a control processing module; the discharge module is used for discharging the verified battery, the charging module is used for charging the backup power module, the backup power module is used for providing electrical energy when an external DC bus loses voltage, and the control processing module is used to output control instructions to control the operation of the discharge module, the charging module and the backup power module; one end of the discharge module is connected to the discharge end of an external battery pack via a discharge cable, the other end of the discharge module is connected to one end of the charging module, the other end of the charging module away from the discharge module is connected to one end of the backup power module, and the other end of the backup power module is connected to the external DC bus via the backup power cable; a first detection module is provided in the external battery pack, a second detection module is provided in the discharge module, and both the first detection module and the second detection module are connected to the control processing module.

[0008] Furthermore, the discharge module includes a first quick-connect plug, a second quick-connect plug, a first control switch, a discharge load unit and a second control switch. One end of the first quick-connect plug is connected to the discharge end of the external battery pack through a discharge cable, and the other end of the first quick-connect plug is connected to the first control switch. The end of the first control switch away from the first quick-connect plug is respectively connected to the input end of the discharge load unit and one end of the second control switch. The other end of the second control switch is connected to one end of the second quick-connect plug. One end of the second quick-connect plug is connected to the charging module, and the control end of the discharge load unit is connected to the control processing module.

[0009] Furthermore, the charging module includes a third quick-connect plug, a fourth quick-connect plug, a first DC-DC converter and a third control switch. One end of the third quick-connect plug is connected to one end of the second quick-connect plug through a connecting cable, the other end of the third quick-connect plug is connected to one end of the first DC-DC converter, the other end of the first DC-DC converter is connected to one end of the third control switch, and the other end of the third control switch is connected to one end of the backup power module.

[0010] Furthermore, the backup power module includes a fifth quick-connect plug, a sixth quick-connect plug, a fourth control switch, a fifth control switch, a BMS module and a backup battery device. One end of the fifth quick-connect plug is connected to the external DC bus via a backup power cable, the other end of the fifth quick-connect plug is connected to one end of the fourth control switch, the other end of the fourth control switch is connected to one end of the backup battery device, the other end of the backup battery is connected to one end of the fifth control switch, the other end of the fifth control switch is connected to one end of the sixth quick-connect plug, the other end of the sixth quick-connect plug is connected to an end of the third control switch away from the first DC-DC converter, one end of the BMS module is connected to the backup battery device, and the other end of the BMS module is connected to the control and processing module.

[0011] Furthermore, the first detection module adopts a battery monitoring device, which includes a temperature monitoring unit, a voltage monitoring unit and a current monitoring unit.

[0012] Furthermore, the second detection module includes a first current detection device, which is arranged between the first quick-connect plug and the first control switch.

[0013] Furthermore, the backup power module also includes two second DC-DC converters, one end of the two second DC-DC converters is connected to the backup battery device, and the other end of the two second DC-DC converters is connected to the fourth control switch.

[0014] Furthermore, the discharge module also includes a discharge meter, which is arranged between the control end of the discharge load unit and the control processing module.

[0015] Furthermore, the discharge load unit adopts a PTC thermistor.

[0016] Furthermore, the backup battery device adopts a lithium iron phosphate battery pack.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] In the present invention, the electric energy output by the battery pack is used to charge the backup power module by using the charging module at the initial stage of discharge, and the discharge module is controlled to discharge the battery pack after the charging of the backup power module is completed; at the same time, the backup power module is connected to the battery pack through a backup power cable, so that when the station AC power supply or the rectifier module fails, resulting in no load DC load capacity, the backup power module can continuously input the backup current to the DC bus; at the same time, when the battery fails to discharge at half capacity, the backup module can be connected to continue the full capacity discharge; at the same time, the first detection module and the second detection module are used to monitor the battery pack and each module of the discharge system, collect data and input them into the control processing module, and the control processing module automatically controls the entire discharge system by judging the collected data information and combining the control instructions input by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the connection between a discharge system for battery core capacity and an external DC power supply cabinet in this embodiment;

[0021] Figure 2 Schematic diagram of the structure of a discharge system for a battery core capacity in this embodiment;

[0022] Figure 3 Schematic diagram of communication connection of a discharge system for a battery core capacity in this embodiment;

[0023] Figure 4 This is a schematic diagram of power distribution between a charging module and a discharging module of a discharge system for a battery core capacity in this embodiment;

[0024] Figure 5 This is a control principle diagram of a discharge system for a battery core capacity in this embodiment;

[0025] Figure 6 This is a control flow chart of a discharge system for a battery core capacity in this embodiment. DETAILED DESCRIPTION

[0026] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0027] In this disclosure, unless otherwise specified, the use of terms such as "first" and "second" to describe various elements is not intended to limit the positional relationship, temporal relationship, or importance relationship of these elements. Such terms are only used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of the element, while in some cases, based on the context of the description, they may also refer to different instances.

[0028] The terms used in the descriptions of various examples in this disclosure are for the purpose of describing specific examples only and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element may be one or more. In addition, the term "and / or" used in this disclosure encompasses any one and all possible combinations of the listed items.

[0029] Example

[0030] See also Figure 1 As shown in the figure, a 220V DC power supply cabinet of a substation is used as an example, which includes a DC busbar and a battery pack. The battery pack consists of 104 lead-acid batteries with a capacity of 200AH. Figure 2 As shown, this embodiment provides a discharge system for battery capacity, the discharge system includes a discharge module, a charging module, a backup power module and a control processing module; the discharge module is used for the discharge operation of the battery under capacity, the charging module is used to charge the backup power module, the backup power module is used to provide power when the external DC bus loses voltage, and the control processing module is used to output control instructions to control the operation of the discharge module, the charging module and the backup power module; one end of the discharge module is connected to the discharge end of the external battery pack through a discharge cable, the other end of the discharge module is connected to one end of the charging module, the other end of the charging module away from the discharge module is connected to one end of the backup power module, and the other end of the backup power module is connected to the external DC bus via the backup power cable; a first detection module is provided in the external battery pack, a second detection module is provided in the discharge module, and the first detection module and the second detection module are both connected to the control processing module.

[0031] It should be noted that, in this embodiment, the external battery pack refers to the external battery pack, and the external DC bus refers to the DC bus in the DC220V DC power supply cabinet of the substation; Figure 3 As shown, the discharge module, the charging module and the backup power module are connected by prefabricated power cables and communication cables; at the same time, the control processing module adopts a terminal device with a 7-inch display touch screen, and the control processing module adopts a communication line of RS485 communication protocol to connect with the second detection module and the discharge meter in the discharge module, the first DC-DC converter in the charging module and the BMS module in the backup power module, and after protocol conversion, it is connected to the first detection module in the external battery pack through the communication line of IEC-61850 communication protocol; the control processing module includes a display unit, an alarm unit, a voltage comparison unit, a current comparison unit, a temperature comparison unit and a control unit; the display unit adopts an LCD display screen for displaying the current voltage, current, temperature and charge / discharge status of the battery pack and the backup module; the alarm unit is used to alarm when the battery voltage is close to or lower than the set threshold An alarm signal is issued to alert the user; the voltage comparison unit is used to compare the detected voltage signal with a preset voltage threshold, and output a voltage comparison signal to the control unit to monitor and control the voltage of the external battery pack, discharge module, charging module and backup power module; the current comparison unit is used to compare the detected current signal with a preset current threshold, and output a current comparison signal to the control unit to monitor and control the current of the external battery pack, discharge module, charging module and backup power module; the temperature comparison unit is used to compare the detected temperature signal with a preset temperature threshold, and output a current comparison signal to the control unit to monitor the ambient temperature of the external battery pack to prevent the battery pack from overheating; the control unit adopts a control processor with stable performance and low power consumption, which is used to output a control signal to control the corresponding module connection to disconnect when an abnormal comparison signal is detected.

[0032] At the same time, it should be noted that overcurrent protection circuits and short-circuit detection circuits are also provided in the discharge module and the charging module. When the current exceeds the set value and a short circuit is detected, the corresponding circuit connection will be automatically cut off; at the same time, an overtemperature protection circuit is provided in the backup power module. When the temperature of the backup power module is too high, the corresponding circuit will be cut off to prevent thermal runaway.

[0033] Specifically, in this embodiment, the discharge module is used to meet the full-capacity verification discharge of lead-acid battery packs with a capacity of 300Ah and below; the charging module is used to meet the charging requirements of the backup power module of the 4.96kWh lithium iron phosphate battery; the backup power module is used to continuously output current into the DC bus as a backup power supply when the station AC power supply or rectifier module fails during the full-capacity verification discharge of the battery pack, resulting in no DC load capacity.

[0034] As a possible implementation, the discharge module includes a first quick-connect plug, a second quick-connect plug (not shown in the figure), a first control switch K1, a discharge load unit, and a second control switch K2. One end of the first quick-connect plug is connected to the discharge end of the external battery pack via a discharge cable, and the other end of the first quick-connect plug is connected to the first control switch K1. The end of the first control switch K1 away from the first quick-connect plug is respectively connected to the input end of the discharge load unit and one end of the second control switch K2. The other end of the second control switch K2 is connected to one end of the second quick-connect plug. One end of the second quick-connect plug is connected to the charging module, and the control end of the discharge load unit is connected to the control processing module.

[0035] It should be noted that, in this embodiment, the rated current of the first control switch K1 is 63A, the rated current of the second control switch K2 is 25A, and the maximum discharge current of the discharge load unit is 50A; the discharge module adopts an independent system device, which also includes an independent single-chip microcomputer control system and a mobile shell structure, one end of the independent single-chip microcomputer control system is connected to the first detection module, the first control switch K1 and the second control switch K2, and the other end of the independent single-chip microcomputer control system is connected to the control processing module, and the first quick-connect plug and the second quick-connect plug are respectively fixed on the outside of the mobile shell to facilitate the connection of other modules; it can record and store various parameters in the discharge process in real time, such as battery The total voltage of the battery pack, single-cell voltage, single-cell internal resistance, discharge current, discharge time and cumulative capacity will not be lost even if the power is off. When the set "stop discharge" condition is met, the discharge module automatically stops discharging (the discharge module stops discharging only when the entire battery pack reaches the termination voltage (half-capacity termination voltage = 1.95V * number of batteries; full-capacity termination voltage = 1.8V * number of batteries)) and records the reason for the end of discharge. At the same time, the discharge load unit also has a discharge meter, the output end of the discharge meter is connected to the discharge load unit, and the control end of the discharge meter is connected to the control processing module. The control processing module outputs a control instruction to control the discharge of the discharge load unit.

[0036] Specifically, in this embodiment, the first quick-connect plug is used to connect to the external battery pack, the second quick-connect plug is used to connect to the charging module, the first control switch K1 is used to control the on and off of the discharge module, and the discharge load unit is used to discharge the external battery pack; the second control switch K2 is used to control the connection with the charging module.

[0037] As a possible embodiment, the charging module includes a third quick-connect plug (not shown in the figure), a fourth quick-connect plug (not shown in the figure), a first DC-DC converter and a third control switch K3. One end of the third quick-connect plug is connected to one end of the second quick-connect plug through a connecting cable, the other end of the third quick-connect plug is connected to one end of the first DC-DC converter, the other end of the first DC-DC converter is connected to one end of the third control switch K3, and the other end of the third control switch K3 is connected to one end of the backup power module.

[0038] It should be noted that, in this embodiment, the input voltage range of the first DC-DC converter is 187-286VDC, the input voltage is typically 220VDC, the output voltage is adjustable in the range of 176-286VDC, the output is typically 234VDC, and the rated current of the third control switch K3 is 16A; before the lead-acid battery of the substation is discharged for verification, the control processing module parameters can be set to "full discharge load capacity" or "lithium battery charging priority", where the "lithium battery charging priority" function principle is to use the discharge energy of the lead-acid battery, and use the first DC-DC converter to convert it to charge the backup power module at the initial stage of discharge. After charging is completed, all the discharge current is automatically converted to the discharge load unit (PTC) for absorption. For logic control, see Figure 4 As shown in the figure, during the charging process of the backup power module, as the charge is transferred to the positive electrode material (lithium iron phosphate), the battery voltage will gradually increase. In the early stage of charging, due to the needs of the chemical reaction inside the battery, the current may be relatively large, but as the charging progresses, the current will gradually decrease until the charging is completed.

[0039] At the beginning of charging, the voltage rises rapidly because the chemical reaction inside the battery is active, requiring a large current to drive it. As charging progresses, the rate of voltage rise gradually slows, entering the constant voltage charging phase. During this phase, the charger maintains the battery voltage constant while reducing the charging current to ensure the battery is safely fully charged. As the battery approaches full charge, the voltage stabilizes, and the charging current is very low, possibly even close to zero.

[0040] At the beginning of charging, the current is high to quickly replenish the battery. As the battery charge increases, the current gradually decreases to avoid excessive damage to the battery. During the constant voltage charging stage, the current continues to decrease until charging is completed.

[0041] Specifically, in this embodiment, the third quick-connect plug is used to connect to the discharge module, the fourth quick-connect plug is used to connect to the backup power module, the first DC-DC converter is used to convert the electrical energy of the discharge module into the electrical energy of the charging module, and the third control switch K3 is used to control the connection with the backup power module.

[0042] As a possible implementation, the backup power module includes a fifth quick-connect plug, a sixth quick-connect plug (not shown in the figure), a fourth control switch K4, a fifth control switch K5, a BMS module, and a backup battery device. One end of the fifth quick-connect plug is connected to the external DC bus via a backup power cable, the other end of the fifth quick-connect plug is connected to one end of the fourth control switch K4, the other end of the fourth control switch K4 is connected to one end of the backup battery device, the other end of the backup battery is connected to one end of the fifth control switch K5, the other end of the fifth control switch K5 is connected to one end of the sixth quick-connect plug, the other end of the sixth quick-connect plug is connected to the end of the third control switch K3 away from the first DC-DC converter, one end of the BMS module is connected to the backup battery device, and the other end of the BMS module is connected to the control and processing module.

[0043] It should be noted that, in this embodiment, two second DC-DC converters are further provided in the backup power module for converting the electrical energy of the backup power module. The two second DC-DC converters are connected in parallel. At the same time, the fifth control switch K5 adopts a contactor with a rated current of 50A, and the rated current of the fourth control switch K4 is 32A. The main function of the backup power module is that during the full-capacity verification discharge of the battery pack, if the station AC power supply or the rectifier module fails, resulting in no DC load capacity, the lithium iron phosphate battery in the backup power module will continuously input current to the DC bus, which serves as a backup power supply to carry the DC load in the station for about 1 hour (4.96kW); by real-time monitoring of key parameters such as the voltage, charge and discharge current, and ambient temperature of the battery pack, the battery is ensured to operate within a safe range.

[0044] At the same time, it should be noted that in this embodiment, when the battery fails to discharge at half capacity, the full capacity discharge of the core capacity battery pack can be continued by connecting the lithium iron phosphate battery of the backup module of this system.

[0045] Specifically, in this embodiment, the fifth quick-connect plug is used to connect to the external DC bus, the sixth quick-connect plug is used to connect to the charging module, the fourth control switch K4 is used to control the connection between the backup power module and the external DC bus, the fifth control switch K5 is used to control the connection between the backup power module and the charging module, the BMS module is used to perform life cycle management of the backup battery device of the backup power module, and the backup battery device is used to store electrical energy.

[0046] As a possible implementation, the first detection module adopts a battery monitoring device, which includes a temperature monitoring unit, a voltage monitoring unit, and a current monitoring unit.

[0047] It should be noted that, in this embodiment, the battery monitoring device adopts conventional battery monitoring equipment. The technical content is a conventional technical means in this field and will not be elaborated here.

[0048] Specifically, in this embodiment, the temperature detection unit is used to monitor the external temperature of the battery pack, the voltage detection unit is used to monitor the input voltage and output voltage of the battery pack, and the current monitoring unit is used to monitor the input current and output current of the battery pack.

[0049] As a possible implementation, the second detection module includes a first current detection device, which is provided between the first quick-connect plug and the first control switch K1.

[0050] It should be noted that, in this embodiment, the first current detection device uses a Hall sensor or a shunt to perform current detection, and the first current detection device is used to detect the input current of the charging module.

[0051] As a possible implementation, the discharge load unit uses a PTC thermistor.

[0052] Specifically, in this embodiment, a temperature controller is provided to control the temperature of the discharge load unit. The discharge load unit utilizes a PTC ceramic resistor, a PTC thermistor element, which is highly reliable and does not glow red. It also possesses a positive temperature coefficient and a Curie temperature, automatically limiting current in the event of a temperature controller (fan) failure. This ensures safety and reliability without damaging the device. The use of a PTC ceramic resistor to discharge the lead-acid battery is primarily based on its nonlinear impedance characteristics. This allows the PTC resistor to change its impedance value with temperature changes, thereby enabling control of the discharge current.

[0053] At the same time, the terminal voltage of the battery pack continuously decreases during discharge. For example, the voltage of a fully charged battery cell is 2.4V, and at the end of discharge, the termination voltage is 1.80V. According to the basic principle of electrical engineering: I = U / R, to maintain a constant current I, the equivalent impedance of the discharge module must be reduced as the voltage U decreases to compensate for the voltage drop. Otherwise, as the battery voltage U decreases, the discharge current I will also decrease. To maintain a constant current value, the equivalent resistance value must decrease as the battery voltage decreases.

[0054] By utilizing the nonlinear impedance characteristics exhibited by the positive temperature coefficient of PTC and controlling the temperature of the PTC surface, the impedance of PTC can be indirectly adjusted, thereby achieving constant current during the discharge process. The current setting is the set discharge current value. The current setting value and the actual current value detected are sent to the error amplifier. The output voltage of the error amplifier controls the drive voltage of the fan, thereby controlling the speed of the fan, thereby controlling the impedance and discharge current of the PTC.

[0055] If the detected current value is less than the set current value, the output voltage of the error amplifier increases, thereby increasing the fan's drive voltage and speed, increasing the air volume received by the PTC surface and reducing the surface temperature. Due to the positive temperature coefficient of the PTC, its equivalent impedance decreases, increasing the discharge current. When the discharge current reaches the set current value, the error amplifier output maintains a stable voltage, thereby maintaining a stable discharge current. If the detected current value is greater than the set current value, the output voltage of the error amplifier decreases, thereby reducing the fan's drive voltage and speed, reducing the air volume received by the PTC surface and increasing the surface temperature of the PTC. Due to the positive temperature coefficient of the PTC, its equivalent impedance increases, thereby reducing the discharge current. When the discharge current reaches the set current value, the error amplifier output maintains a stable voltage, thereby maintaining a stable discharge current.

[0056] As a possible implementation, the backup battery device uses a lithium iron phosphate battery pack.

[0057] Specifically, in this embodiment, the backup battery device is composed of 62 3.2V lithium iron phosphate batteries, forming a backup battery pack with a capacity of 25AH / 4.96KWh.

[0058] See also Figure 4-6 As shown, in this embodiment, a discharge system for battery core capacity is provided with an idle state (the discharge load unit stops discharging and the fifth control switch K5 is disconnected) and three operating states. At the same time, seven judgment events are provided to control the switching between different operating states:

[0059] State1 idle state: the discharge load unit is turned off and the fifth control switch K5 is disconnected;

[0060] State2. Full discharge load core capacity state: the discharge load unit is turned on (discharge load 30A), and the fifth control switch K5 is disconnected;

[0061] State 3. Lithium battery charging priority. When the core capacity backup battery is not fully charged: the discharge load unit is turned on, and the first DC-DC converter current is up to 10A;

[0062] State 4. Station AC power supply or rectifier module fault state: discharge load unit is closed.

[0063] event1. Fully discharged load core capacity start command;

[0064] event2. Backup battery device charging priority core capacity start command;

[0065] event3. Backup battery charging is complete: the charging current is less than the set current;

[0066] Event 4. Station AC power supply or rectifier module failure: The current of the backup power cable is greater than 0.1A and lasts for more than 10 seconds.

[0067] Event 5. Capacity verification result: If the voltage of the battery pack is greater than the termination voltage and reaches the capacity verification time limit, the result is successful; otherwise, it fails.

[0068] Event 6. The single cell of the nuclear capacity battery pack loses pressure;

[0069] Event 7. Manually check for any problems.

[0070] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A discharge system for battery core capacity, characterized in that: The discharge system includes a discharge module, a charging module, a backup power module and a control processing module; the discharge module is used for discharging the battery under nuclear capacity, the charging module is used to charge the backup power module, the backup power module is used to provide power when the external DC bus loses voltage, and the control processing module is used to output control instructions to control the operation of the discharge module, the charging module and the backup power module; one end of the discharge module is connected to the discharge end of the external battery pack through a discharge cable, the other end of the discharge module is connected to one end of the charging module, the other end of the charging module away from the discharge module is connected to one end of the backup power module, and the other end of the backup power module is connected to the external DC bus via a backup power cable; a first detection module is provided in the external battery pack, a second detection module is provided in the discharge module, and both the first detection module and the second detection module are connected to the control processing module; The charging module includes a third quick-connect plug, a fourth quick-connect plug, a first DC-DC converter, and a third control switch. One end of the third quick-connect plug is connected to one end of the second quick-connect plug via a connecting cable. The other end of the third quick-connect plug is connected to one end of the first DC-DC converter. The other end of the first DC-DC converter is connected to one end of the third control switch. The other end of the third control switch is connected to one end of the backup power module. The backup power module includes a fifth quick-connect plug, a sixth quick-connect plug, a fourth control switch, a fifth control switch, a BMS module, and a backup battery device. One end of the fifth quick-connect plug is connected to the external DC bus via a backup power cable, the other end of the fifth quick-connect plug is connected to one end of the fourth control switch, the other end of the fourth control switch is connected to one end of the backup battery device, the other end of the backup battery is connected to one end of the fifth control switch, the other end of the fifth control switch is connected to one end of the sixth quick-connect plug, the other end of the sixth quick-connect plug is connected to an end of the third control switch away from the first DC-DC converter, one end of the BMS module is connected to the backup battery device, and the other end of the BMS module is connected to the control processing module. The backup power module also includes two second DC-DC converters, one end of each of the two second DC-DC converters is connected to the backup battery device, and the other end of each of the two second DC-DC converters is connected to the fourth control switch. When the core capacity discharge begins, the control processing module preferentially controls the charging module to use the discharged power of the core capacity battery group to charge the backup power module; when the backup power module is fully charged, the control processing module automatically switches to the full discharge load core capacity state, and all the power of the core capacity battery group is fully discharged through the discharge load unit; if the station AC power supply or rectifier module fails during the full capacity discharge process, the control processing module immediately shuts down the discharge module and controls the backup power module to provide uninterrupted power to the DC bus through the dual second DC-DC converter.

2. A discharge system for battery core capacity according to claim 1, characterized in that: The discharge module includes a first quick-connect plug, a second quick-connect plug, a first control switch, a PTC thermistor and a second control switch. One end of the first quick-connect plug is connected to the discharge end of the external battery pack through a discharge cable, and the other end of the first quick-connect plug is connected to the first control switch. The end of the first control switch away from the first quick-connect plug is respectively connected to the input end of the PTC thermistor and one end of the second control switch. The other end of the second control switch is connected to one end of the second quick-connect plug. One end of the second quick-connect plug is connected to the charging module, and the control end of the PTC thermistor is connected to the control processing module.

3. A discharge system for battery core capacity according to claim 1, characterized in that: The first detection module adopts a battery monitoring device, which includes a temperature monitoring unit, a voltage monitoring unit and a current monitoring unit.

4. A discharge system for battery core capacity according to claim 2, characterized in that: The second detection module includes a first current detection device, which is arranged between the first quick-connect plug and the first control switch.

5. A discharge system for battery core capacity according to claim 2, characterized in that: The discharge module also includes a discharger, which is arranged between the control end of the PTC thermistor and the control processing module.

6. A discharge system for battery core capacity according to claim 1, characterized in that: The backup battery device uses a lithium iron phosphate battery pack.

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