Discharging system for capacity checking of storage battery

Abstract

The invention discloses a discharging system for capacity checking of a storage battery, and particularly relates to the field of capacity checking of storage batteries, and the discharging system is technically characterized by comprising a discharging module, a charging module, a standby power module and a control processing module, the discharging module is used for discharging a capacity-checked storage battery, the charging module is used for charging the standby power module, the standby power module is used for providing electric energy when an external direct-current bus loses voltage, and the control processing module is used for outputting a control instruction to control the discharging module, the charging module and the standby power module to operate; one end of the discharging module is connected with the discharging end of an external storage battery pack through a discharging cable, the other end of the discharging module is connected with one end of the charging module, the other end, away from the discharging module, of the charging module is connected with one end of the standby power module, and the other end of the standby power module is connected with an external direct-current bus through a standby power cable. A first detection module is arranged in the external storage battery pack, and a second detection module is arranged in the discharging module.

Description

Technical Field

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

[0002] As an energy storage device, batteries play a vital role in many fields, such as power systems and communication systems. The main purpose of battery capacity verification is to accurately grasp the actual capacity of the battery and ensure that it can reliably provide power when needed. Specifically, it includes: checking whether the performance of the battery meets the requirements and judging whether it can continuously supply power to the load within the specified time; timely discovering problems such as battery aging and damage so as to carry out maintenance or replacement to ensure the stable operation of the system.

[0003] The battery capacity verification of the DC power supply system of the substation mainly adopts the offline verification method. 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) discharges 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 DC load capacity, 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 is relatively cumbersome in the prior art, and the verified capacity battery group 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 has the 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 group at the initial stage of discharge, and then controlling the discharge module to discharge the battery group after the backup power module is charged; at the same time, by setting the backup power module to be connected to the battery group through the backup power cable, when the station AC power supply or the rectifier module fails, resulting in no load-carrying DC load capacity, the backup power module can continuously put the backup current into the DC bus; at the same time, when the half-capacity discharge of the battery is unqualified, 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 group and each module of the discharge system are monitored and data is collected and input 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.

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

[0007] A discharge system for battery capacity control, the discharge system comprises 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 control, the charging module is used for charging the backup power module, the backup power module is used for providing electric energy when an external DC bus loses voltage, and the control processing module is used for outputting 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 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 through 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, the other end of the first quick-connect plug is connected to the first control switch, an 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] Further, 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 one 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.

[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, and the first current detection device 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 are connected to the backup battery device, and the other end of the two second DC-DC converters are connected to the fourth control switch.

[0014] Furthermore, the discharge module also includes a discharge instrument, 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 group is charged to the backup power module by the charging module at the initial stage of discharge, and the discharge module is controlled to discharge the battery group after the charging of the backup power module is completed; at the same time, the backup power module is connected to the battery group through the backup power cable, so that when the station AC power supply or the rectifier module fails, resulting in no DC load capacity, the backup power module can continuously input the backup current to the DC bus; at the same time, when the half-capacity discharge of the battery is unqualified, the full-capacity discharge can be continued after the backup module is connected; at the same time, the first detection module and the second detection module are used to monitor the battery group and each module of the discharge system for data collection and input 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 embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 This is a schematic diagram of the connection between a discharge system for a 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 This is a communication connection diagram 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 discharging 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 is a description of exemplary embodiments of the present disclosure 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 recognized by those of ordinary skill 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, the description of well-known functions and structures is omitted in the following description.

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

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

[0029] Example

[0030] See also Figure 1 As shown, taking the DC220V DC power supply cabinet of the substation as an example, it includes a DC busbar and a nuclear capacity battery group, which is composed of 104 lead-acid batteries with a capacity of 200AH; see Figure 2 As shown, this embodiment provides a discharge system for battery core 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 core capacity battery, 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 through 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; see 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 discharger 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 the preset voltage threshold, and output the voltage comparison signal to the control unit to monitor and control the voltage of the external battery pack, the discharge module, the charging module and the backup power module; the current comparison unit is used to compare the detected current signal with the preset current threshold, and output the current comparison signal to the control unit to monitor and control the current of the external battery pack, the discharge module, the charging module and the backup power module; the temperature comparison unit is used to compare the detected temperature signal with the preset temperature threshold, and output the 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 the comparison signal is detected to be abnormal.

[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 groups 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 group, 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 through a discharge cable, and the other end of the first quick-connect plug is connected to the first control switch K1. An 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 control system and a mobile shell structure, one end of the independent single-chip 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 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, the voltage of a single battery cell, the internal resistance of a single battery cell, the discharge current, the discharge time and the accumulated 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 when the entire battery pack reaches the termination voltage (the termination voltage of half-capacity = 1.95V*number of batteries; the termination voltage of full-capacity = 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, the control end of the discharge meter is connected to the control processing module, and 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 for discharging the external battery pack; the second control switch K2 is used to control the connection with the charging module.

[0037] As a possible implementation, 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 typical input voltage is 220VDC, the adjustable output voltage range is 176-286VDC, the typical output value is 234VDC, and the rated current of the third control switch K3 is 16A; before the verification discharge of the lead-acid battery of the substation, the "full discharge load core capacity" or "lithium battery charging priority" can be set through the control processing module parameter, wherein the "lithium battery charging priority" function principle is to use the discharge electric 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 rise. 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 same time, at the beginning of charging, the voltage rises quickly because the chemical reaction inside the battery is active and requires a large current to drive it. As charging progresses, the rate of voltage rise gradually slows down and enters the constant voltage charging stage. In this stage, the charger will keep the battery voltage constant while reducing the charging current to ensure that the battery is safely fully charged. When the battery is close to full charge, the voltage will tend to stabilize, and the charging current is very small, or even close to zero;

[0040] At the beginning of charging, the current is large to quickly replenish the battery. As the battery power increases, the current gradually decreases to avoid excessive damage to the battery. During the constant voltage charging stage, the current will continue to decrease until the 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 electric energy of the discharge module into the electric 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 one 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 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 electric energy of the backup power module. The two second DC-DC converters are in parallel relationship. 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 1h (4.96kW); by real-time monitoring of key parameters such as the voltage of the single cell, the charge and discharge current, and the ambient temperature of the battery pack, the battery is ensured to operate within a safe range.

[0044] At the same time, it should also be noted that in this embodiment, when the half-capacity discharge of the battery fails, 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 the system.

[0045] Specifically, in this embodiment, the fifth quick-connect plug is used to connect to an external DC bus, the sixth quick-connect plug is used to connect to a 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 on 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, and the technical content is a conventional technical means in this field, which 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, and the first current detection device is arranged between the first quick-connect plug and the first control switch K1.

[0050] It should be noted that, in the present embodiment, the first current detection device uses a Hall sensor or a shunt to detect the current, 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 adopts a PTC thermistor.

[0052] Specifically, in this embodiment, in order to control the temperature of the discharge load unit, a temperature controller is also provided accordingly; the discharge load unit specifically adopts the PTC ceramic resistor in the PTC thermistor, which has good reliability and does not turn red; it also has a "positive temperature coefficient" and a "Curie temperature" point, and will automatically limit the current when the temperature controller (fan) fails, which is safe and reliable and will not damage the equipment; the use of the PTC ceramic resistor to discharge the lead-acid battery is mainly based on the nonlinear impedance characteristics of the PTC ceramic resistor. This characteristic enables the PTC resistor to change its impedance value as the temperature changes, thereby realizing the control of the discharge current.

[0053] At the same time, during the discharge process, the terminal voltage of the battery pack is constantly decreasing. For example, the voltage of a fully charged battery cell is 2.4V, and when the discharge is terminated, the termination voltage is 1.80V. According to the basic principle of electrical engineering: I = U / R, in order to keep the current I constant, as the voltage U decreases, the equivalent impedance of the discharge module must be reduced to compensate for the voltage decrease. Otherwise, as the battery voltage U decreases, the discharge current I will decrease accordingly. If the current value is to be kept constant, 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 driving 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 current given value, the output voltage of the error amplifier increases, thereby increasing the drive voltage and speed of the fan, 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 current given value, the error amplifier output is maintained at a stable voltage, thereby maintaining the discharge current stable. If the detected current value is greater than the current given value, the output voltage of the error amplifier decreases, thereby reducing the drive voltage and speed of the fan, 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 current given value, the error amplifier output is maintained at a stable voltage, thereby maintaining the discharge current stable.

[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 to form 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, and seven judgment events are also provided for controlling 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] state3. Lithium battery charging priority nuclear 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] state4. Station AC power supply or rectifier module fault state: discharge load unit is turned off.

[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 10s;

[0067] event5. The result of capacity verification is generated: if the voltage of the battery pack is greater than the termination voltage and reaches the capacity verification time limit, it is successful, otherwise it fails;

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

[0069] event7. Manually check if there are 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 the discharge operation of the nuclear capacity battery, 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 through 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.

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 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. An 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.

3. A discharge system for battery core capacity according to claim 2, characterized in that: 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.

4. A discharge system for battery core capacity according to claim 3, characterized in that: 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 one 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.

5. 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.

6. 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.

7. A discharge system for battery core capacity according to claim 4, characterized in that: The backup power module also includes two second DC-DC converters, one end of the two second DC-DC converters are connected to the backup battery device, and the other end of the two second DC-DC converters are connected to the fourth control switch.

8. 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 discharge load unit and the control processing module.

9. A discharge system for battery core capacity according to claim 2, characterized in that: The discharge load unit adopts PTC thermistor.

10. A discharge system for battery core capacity according to claim 4, characterized in that: The backup battery device uses a lithium iron phosphate battery pack.

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