CN113507147A - PCU-NG and pre-charging method for connecting PCU-NG with lithium ion storage battery pack - Google Patents
PCU-NG and pre-charging method for connecting PCU-NG with lithium ion storage battery pack Download PDFInfo
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- CN113507147A CN113507147A CN202110660935.2A CN202110660935A CN113507147A CN 113507147 A CN113507147 A CN 113507147A CN 202110660935 A CN202110660935 A CN 202110660935A CN 113507147 A CN113507147 A CN 113507147A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 89
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 22
- KISUPFXQEHWGAR-RRKCRQDMSA-N 4-amino-5-bromo-1-[(2r,4s,5r)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one Chemical compound C1=C(Br)C(N)=NC(=O)N1[C@@H]1O[C@H](CO)[C@@H](O)C1 KISUPFXQEHWGAR-RRKCRQDMSA-N 0.000 claims abstract description 98
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 241001175904 Labeo bata Species 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012936 correction and preventive action Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a PCU-NG and a pre-charging method thereof connected with a lithium ion storage battery pack, wherein the PCU-NG comprises M groups of BCDR modules, each group of BCDR modules comprises N BCDR modules connected in parallel, and each BCDR module comprises a first input port and a first input port; m is more than or equal to 1, and N is more than or equal to 1; each group of BCDR modules is correspondingly connected with one group of lithium ion storage batteries, and the lithium ion storage battery pack realizes bus regulation and charging through the BCDR modules; in the same group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the lithium ion storage battery pack in parallel; and a pre-charging node is arranged in an output port of the PCU-NG, and a pre-charging resistor is connected between the pre-charging node and the common grounding end of 2N parallel BCDR modules and is used for pre-charging the lithium ion storage battery.
Description
Technical Field
The invention relates to a PCU-NG and a pre-charging method for connecting the PCU-NG with a lithium ion storage battery pack, and belongs to the technical field of electrical engineering.
Background
Compared with DFH-4PCU, PCU-NG effectively provides 100v bus, quality is reduced by 30%, conversion efficiency and other performances are effectively improved, cost is saved by 15% -20%, solar wing power efficiency improvement requirements and lithium ion storage battery use requirements can be effectively met, and PCU-NG is adopted in the DFH-4E platform. The new generation of power supply control adopts a modular design, and has four types of modules: the system comprises a SUN module, a TMTC module, a BCDR module and a CAPA module. One SUN module comprises three S3R circuits, power loss of a solar cell array caused by single-point faults (bus diode parallel redundancy and shunt MOSFET series redundancy) can be effectively prevented, an S3R protection circuit is designed, and meanwhile, the matching degree of the protection circuit with a GaAs solar cell is higher, and no capacitor is discharged. Based on the above advantages, PCU-NG replaces PCU for the satellite to perform the power bus regulation function.
However, unlike the conventional PCU, the PCU-NG integrates the function of a storage battery access relay, and does not need to be additionally provided with a storage battery access control relay, because the input interface of the BCDR module has a large capacitance and the voltage of the lithium ion storage battery pack is high, if the PCU-NG and the lithium ion storage battery pack are directly connected without measures, the ignition phenomenon occurs at the interfaces of the PCU-NG and the lithium ion storage battery pack, so that the problem that how to safely and reliably connect the PCU-NG and the lithium ion storage battery pack in a matching manner is a problem to be solved, and the PCU-NG and the lithium ion storage battery pack are ensured to be safe and reliable, and the application reliability of a power supply system is ensured.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the PCU-NG and the pre-charging method for connecting the PCU-NG and the lithium ion storage battery pack are provided for the geosynchronous orbit long-life satellite power supply system provided with the PCU-NG, so that the PCU-NG and the lithium ion storage battery pack are reliably and safely connected, and the safety of the satellite power supply system is improved.
The technical scheme of the invention is as follows: a PCU-NG, the PCU-NG comprising M groups of BCDR modules, each group of BCDR modules comprising N BCDR modules in parallel, each BCDR module comprising a first input port, a first input port; m is more than or equal to 1, and N is more than or equal to 1;
each group of BCDR modules is correspondingly connected with one group of lithium ion storage batteries, and the lithium ion storage battery pack realizes bus regulation and charging through the BCDR modules; in the same group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the lithium ion storage battery pack in parallel;
a pre-charging node is arranged in an output port of the PCU-NG, and a pre-charging resistor is connected between the pre-charging node and a common grounding end of 2N parallel BCDR modules.
Preferably, the BCDR module further includes an input filter for filtering input interference and stabilizing bus voltage; the input filter comprises a capacitor C1 and a resistor R1, one end of the capacitor C1 is connected with the first input port, the other end of the capacitor C1 is connected with the resistor R1, the other end of the resistor R1 is grounded and connected with the second input port, and the capacitance value of the capacitor C1 reaches us level.
Preferably, the pre-charge resistance is 95-105 ohms.
Preferably, the positive end of the lithium ion storage battery pack is connected with the first input ports of the N BCDR modules in the PCU-NG through a positive end shunt plug; the negative end of the lithium ion storage battery pack is connected with the second input ports of the N BCDR modules in the PCU-NG through a negative end shunt plug;
the positive side branch plug and the negative side branch plug are 1-branch N plugs and comprise an input branch and N output branches, the input branch is connected with the positive side and the negative side of the lithium ion storage battery pack, and the N output branches can be independently plugged into a first input port or a second input port of the BCDR module on the PCU-NG.
The other technical scheme of the invention is as follows: the method for pre-charging the connection between the PCU-NG and the lithium ion storage battery pack comprises the following steps:
s1, after the whole satellite cable network is laid in place, before the lithium ion storage battery is installed, leading the output port of the PCU-NG to a plug installed on the satellite surface through cable connection;
s2, keeping the lithium ion battery pack connector not inserted, and keeping all nodes on the connector in a suspended state to ensure that the nodes are not connected to a satellite ground;
s3, connecting the input branch of the branching plug of the positive end with the positive end of the lithium ion storage battery pack, and connecting the N input branches with the first input port of the BCDR module corresponding to the PCU-NG;
s4, one end of a pre-charging cable is connected with a plug on the surface of the satellite, and the other end of the pre-charging cable is connected with one output branch of the negative terminal shunt plug, so that a pre-charging node in an output port of the PCU-NG is connected with the negative terminal of the lithium ion storage battery pack;
s5, waiting for a preset charging time until the pre-charging is completed, and entering the step S6;
s6, connecting the plug on the surface of the satellite and the rest output branches of the negative side shunt plug to a second input port of the BCDR module corresponding to the PCU-NG;
s7, disconnecting the pre-charging cable from the lithium ion battery pack, and connecting the branch of the negative terminal shunt plug for pre-charging to the port corresponding to PCU-NG;
and S8, disconnecting the pre-charging cable from the plug on the surface of the satellite, and ending the pre-charging process.
Preferably, the preset charging time is theoretically not less than 1 s.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention sets the pre-charging interface of the PCU-NG aiming at the characteristic of large filter capacitance of the configured PCU-NG, and regulates the size of the pre-charging resistor, thereby ensuring that the surge current is effectively inhibited when the lithium ion storage battery is connected.
(2) The invention sets a safe access method of the PCU-NG-lithium ion storage battery for the PCU-NG which needs to be pre-charged, stipulates the pre-charging time, avoids striking sparks when the PCU-NG is connected with the lithium ion storage battery, harms the safety of a single machine and operators, and guarantees the safety and reliability of system connection.
(3) The method can be applied to multiple models, and related research results can be popularized to the application of a space high-orbit satellite power supply system with a PCU-NG-lithium ion storage battery pack.
Drawings
FIG. 1 is a diagram of a PCU-NG module configuration according to an embodiment of the present invention;
FIG. 2 is a block diagram of the PCU-NG module according to an embodiment of the present invention;
FIG. 3 shows the BCDR and battery pack interface relationship according to an embodiment of the present invention;
FIG. 4 is a diagram of a PCU-NG and battery pre-charge interface according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the precharge of the north battery pack according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the precharge of the south-coupled battery pack according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a PCU-NG and a pre-charging method thereof connected with a lithium ion storage battery pack.
As shown in fig. 1, a PCU-NG provided by the present invention includes M groups of BCDR modules, each group of BCDR modules includes N BCDR modules connected in parallel, each BCDR module includes a first input port, a first input port; m is more than or equal to 1, and N is more than or equal to 1;
each group of BCDR modules is correspondingly connected with one group of lithium ion storage batteries, and the lithium ion storage battery pack realizes bus regulation and charging through the BCDR modules; in the same group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the lithium ion storage battery pack in parallel;
a pre-charging node is arranged in an output port of the PCU-NG, and a pre-charging resistor is connected between the pre-charging node and a common grounding end of 2N parallel BCDR modules.
The positive end of the storage battery of the lithium ion storage battery pack is connected with the first input ports of the N BCDR modules in the PCU-NG through a positive end shunt plug; the negative end of the lithium ion storage battery pack is connected with the second input ports of the N BCDR modules in the PCU-NG through a negative end shunt plug;
the positive side branch plug and the negative side branch plug are 1-branch N plugs and comprise an input branch and N output branches, the input branch is connected with the positive side and the negative side of the lithium ion storage battery pack, and the N output branches can be independently plugged into a first input port or a second input port of the BCDR module on the PCU-NG.
Preferably, the pre-charge resistance is 95-105 ohms.
The method for pre-charging the connection between the PCU-NG and the lithium ion storage battery pack comprises the following steps:
s1, after the whole satellite cable network is laid in place, before the lithium ion storage battery is installed, leading the output port of the PCU-NG to a plug installed on the satellite surface through cable connection;
s2, keeping the lithium ion battery pack connector not inserted, and keeping all nodes on the connector in a suspended state to ensure that the nodes are not connected to a satellite ground;
s3, connecting the input branch of the branching plug of the positive end with the positive end of the lithium ion storage battery pack, and connecting the N input branches with the first input port of the BCDR module corresponding to the PCU-NG;
s4, one end of a pre-charging cable is connected with a plug on the surface of the satellite, and the other end of the pre-charging cable is connected with one output branch of the negative terminal shunt plug, so that a pre-charging node in an output port of the PCU-NG is connected with the negative terminal of the lithium ion storage battery pack;
s5, waiting for a preset charging time until the pre-charging is completed, and entering the step S6; the preset charging time is not less than 1 s.
S6, connecting the plug on the surface of the satellite and the rest output branches of the negative side shunt plug to a second input port of the BCDR module corresponding to the PCU-NG;
and S7, disconnecting the pre-charging cable from the lithium ion storage battery pack, and connecting the branch of the negative side shunt plug for pre-charging to a port corresponding to the PCU-NG.
And S8, disconnecting the pre-charging cable from the plug on the surface of the satellite, and ending the pre-charging process.
Example (b):
in one embodiment of the invention, the PCU-NG is 14.4kW PCU-NG, the 14.4kW PCU-NG realizes weight reduction and performance improvement by highly integrating a BCR module and a BDR module into one module, and realizes power expansion by parallel connection of a charge and discharge regulation module (BCDR). The system comprises 1 capacitor module, 2 TMTC modules, 6 SUN modules and two groups of BCDR modules. Each group of BCDR modules comprises 5 BCDR modules connected in parallel, and each BCDR module comprises a first input port, an input filter circuit, an input switch ISW, an auxiliary power supply APS, a BDR module, a BCR module, an output switch OSW, an output filter circuit and an output port.
Connected to the solar array are 6 SUN modules, which contain a total of 18S 3R shunt regulator circuits. The 14.4kW PCU-NG expansion block diagram is shown in FIG. 1, and it can be seen from FIG. 1 that the number of SUN modules increases gradually from the middle of the PCU outwards. Each SUN module is adjacent to two BCDR modules.
When the power of the local shadow season or the solar cell array is insufficient, the bus regulation of each group of lithium ion battery packs is realized through 5 hot backup BCDR modules. When the power of the solar cell array is sufficient, the charging of the battery pack is realized through 5 hot backup BCDR modules.
The BDR module and the BCR module work at the switching frequency of 150kHz, each BCDR module adopts an independent power supply, and when the voltage of a power supply bus is greater than the minimum input voltage (generally 95V) and a disconnection instruction is not sent, the BCDR module starts to work in a soft start mode. The BCDR principle is shown in fig. 2.
The BDR module works in a current source mode, so that a plurality of BDR regulators can work in parallel to realize power expansion, and current balance among the BDR modules can be ensured through uniform MEA control signals. In addition, the BCR also works in a current source mode, and a charging control point is set through a battery charging management module (BCM), so that the parallel operation of a plurality of BCR modules is realized, and the storage battery pack is charged.
The BCDR module is provided with an input switch and an output switch, so that overload and short circuit of a bus or a battery pack can be avoided under any fault condition.
Meanwhile, the complete isolation between the storage battery pack and the whole satellite during the AIT period can be realized, so that the power-off function of the whole satellite in an emergency situation is ensured.
The energy of the storage battery pack is transmitted to a BCR circuit or a BDR circuit through an input filter and a switch ISW to perform power conversion, 100V is formed, and is transmitted to a bus through a switch OSW and an output filter capacitor to form a stable 100V bus. The input filter is used for stabilizing an input source and avoiding external electrical interference, and the output filter capacitor is used for stabilizing a bus. The switches ISW and OSW are internal protection switches provided for the BCDR module. The BCR circuit is a voltage reduction circuit, converts the bus voltage into the storage battery voltage and charges the storage battery pack; the BDR circuit is a booster circuit, converts the voltage of the storage battery into stable bus voltage and supplies power to a load. The bus voltage is 100V, and the storage battery pack voltage is 55-98.5V. In each BCDR module, the input filter comprises a capacitor C1 and a resistor R1, one end of the capacitor C1 is connected with the first input port, the other end of the capacitor C1 is connected with the resistor R1, the other end of the resistor R1 is grounded and connected with the second input port, and the capacitor is in the us level.
In the first group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the north lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the north lithium ion storage battery pack in parallel; the north lithium ion storage battery pack realizes bus regulation and charging through the first group of BCDR modules;
in the second group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the south lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the south lithium ion storage battery pack in parallel; the south lithium ion storage battery pack realizes bus regulation and charging through the first group of BCDR modules;
because the capacitance C1 at the input interface of the BCDR module is us grade and the voltage of the lithium ion storage battery pack is higher, if the PCU-NG and the lithium ion storage battery pack are directly connected without measures, the ignition phenomenon can occur at the interfaces of the PCU-NG and the lithium ion storage battery pack.
The PCU-NG internally configures an ISW (power MOS) to implement a battery isolation function, as shown in fig. 3. A large BCDR module input filter capacitor exists between the storage battery and the storage battery isolation power MOS tube. If the battery is directly connected to the PCU-NG during the installation of the battery (process or prototype battery), a large inrush current exists in the circuit from the battery to the input capacitor, and ignition may occur. Therefore, the design inside the PCU-NG adds a pre-charging resistor and is connected with a 100 omega current-limiting resistor in series (red circles in the figure). As shown in fig. 4, a precharge node is provided in the output port of the PCU-NG, and a precharge resistor is connected between the precharge node and the common ground of the 2N BCDR modules connected in parallel. The precharge resistor is 100 ohms in this embodiment.
The positive end of a storage battery of the north lithium ion storage battery pack is connected with first input ports of N BCDR modules in the PCU-NG through a first positive end shunt plug; the negative end of the storage battery of the north lithium ion storage battery pack is connected with second input ports of the N BCDR modules in the PCU-NG through a first negative end shunt plug;
the positive end of the storage battery of the south lithium ion storage battery pack is connected with first input ports of the N BCDR modules in the PCU-NG through a second positive end shunt plug; the negative end of the storage battery of the south lithium ion storage battery pack is connected with second input ports of the N BCDR modules in the PCU-NG through a second negative end shunt plug;
the first positive end shunt plug, the second positive end shunt plug, the first negative end shunt plug and the second negative end shunt plug are 1-minute N plugs and comprise an input branch and N output branches, and the N output branches can be independently plugged into an input port of a BCDR module on the PCU-NG.
As shown in fig. 5 and 6, the PCU-NG input capacitor needs to be charged before the installation of the process or the positive battery, and therefore the present embodiment also provides the above-mentioned method of precharging the PCU-NG in connection with the lithium ion battery pack, the method including the steps of:
s1, after the cable network of the whole satellite is laid in place, before the lithium ion storage battery is installed, in order to facilitate the operation and the test requirement, the output port of the PCU-NG is connected and led to a plug installed on the surface of the satellite through a cable;
in the embodiment, the output port of the PCU-NG is J30, a pre-charging contact is arranged on the J30 of the PCU-NG, and a north-south storage battery pre-charging interface on the J30 end of the PCU-NG is led to the contact of a star-table plug X16B- (Z);
s2, the south lithium ion storage battery pack and the north lithium ion storage battery pack are not plugged, all nodes on the connectors are in a suspended state, and the nodes are not connected to a satellite ground;
in the embodiment, the PCU-NG BCDR 1A-5A BATa + end is not spliced, and the BCDR 1B-5 BBATb + end is not spliced, namely N01A-J04A, N01A-J09A, N01A-J14A, N01A-J16A, N01A-J21A, N01A-J04B, N01A-J09B, N01A-J14B, N01A-J16B and N01A-J21B are not spliced; the power series cable in the storage battery pack is inserted, the battery positive terminal bat + is inserted firstly, and then the battery negative terminal bat is inserted;
s3, connecting one end of the first positive end shunt plug with the positive end of the north lithium ion battery pack, and connecting the other end of the first positive end shunt plug with a port corresponding to the PCU-NG; connecting a second positive end shunt plug with the positive end of the south lithium ion storage battery pack, and connecting the other end of the second positive end shunt plug with a port corresponding to the PCU-NG;
in the embodiment, a power supply positive end cable (PLW01001) of the whole satellite cable north storage battery pack is plugged, a PCU-NG BCDR 1A-5 ABATa + end (N01A-J04A, N01A-J09A, N01A-J14A, N01A-J16A and N01A-J21A) is plugged, and a north storage battery positive end (N0302A-X02) is plugged after 5 connectors of the PCU end are plugged.
The power supply positive end cable (PLW01003) of the whole star cable south storage battery pack is plugged, PCU-NG BCDR 1B-5B BATb + (N01A-J04B, N01A-J09B, N01A-J14B, N01A-J16B and N01A-J21B) are plugged, and the positive end (N0402A-X02) of the south storage battery is plugged after 5 connectors at the PCU end are plugged.
S4, one end of a pre-charging cable is connected with a plug on the surface of the satellite, the other end of the pre-charging cable is divided into two branches, the first branch is connected with one output branch of the second branch plug, the second branch is connected with one branch of the fourth branch plug, and a pre-charging node in an output port of the PCU-NG is connected with the negative terminals of the south lithium ion storage battery pack and the north lithium ion storage battery pack;
in this embodiment, a precharge dedicated cable is developed to connect the precharge interface of the star table X16B- (Z) and the battery negative terminal connector, and the precharge operation before battery installation is started.
Plugging a power supply negative terminal cable (PLW01002) of the whole star cable for the north storage battery pack, connecting a cable connector to a negative terminal (N0301A-X01) of the north storage battery pack, plugging a power supply negative terminal cable (PLW01004) of the whole star cable for the south storage battery pack, and connecting the cable connector to a negative terminal (N0401A-X01) of the south storage battery pack;
connecting a special pre-charging cable, plugging the special pre-charging cable to a pre-charging interface (blue solid line) of X16B- (Z), plugging a cable end BCDR1ABATa- (N01A-J05A) of a north storage battery pack power supply negative end cable (PLW01002) to the special pre-charging cable, and plugging a cable end BCDR1B BATb- (N01A-J05B) of a south storage battery pack power supply negative end cable (PLW01004) to the special pre-charging cable. At the moment, the storage battery charges the PCU BCDR input capacitor, the energy of the lithium ion storage battery pack is transferred to the input capacitor, only a unique charging path can be established through a pre-charging circuit, due to the arrangement of a pre-charging resistor, the maximum charging current of the input capacitor is Vbat/100 omega < 0.985A, the current is small, the ignition risk is avoided, and the operation safety is improved;
s5, waiting for a preset charging time until the pre-charging is completed, and entering the step S5; in this embodiment, wait for 1 min;
s6, connecting the plugs on the surface of the satellite and the other output branches of the second branch plug and the fourth branch plug to the corresponding ports of the PCU-NG;
in this embodiment, a cable of a north battery pack power supply loop (PLW01002) is connected to the PCU-NG, and the cable is plugged into 4 connectors (N01A-J10A, N01A-J15A, N01A-J17A, and N01A-J22A) of the PCU end BCDR 2A-5A BATa-.
The cable of the power supply loop line of the south storage battery pack (PLW01004) is connected with the PCU-NG, and the cable is plugged into 4 connectors (N01A-J10B, N01A-J15B, N01A-J17B and N01A-J22B) of the BCDR 2B-5B BATb-.
And S7, disconnecting the pre-charging cable from the south lithium ion storage battery pack and the north lithium ion storage battery pack, and connecting branches for pre-charging in the second branch plug and the fourth branch plug to a port corresponding to the PCU-NG.
In this embodiment, the cable dedicated for precharging is disconnected, the X16B- (Z) terminal is disconnected, and then the connector with the negative terminal of the battery is disconnected (N01A-J05A and N01A-J05B);
inserting BCDR1A BATa- (N01A-J05A) of a north battery pack power supply loop cable (PLW01002) into PCU-NG BCDR1A BATa-, inserting BCDR1B BATb- (N01A-J05B) of a south battery pack power supply loop cable (PLW01004) into PCU-NG BCDR1B BATb-, and inserting all connectors at the PCU BCDR end into positions;
and S8, disconnecting the pre-charging cable from the plug on the surface of the satellite, and ending the pre-charging process.
And finally, sequentially connecting other connectors of the storage battery pack: the module comprises a module A and a module B (X03, X04, X05 and X06), and X07 of the module A (X07 of the module B is an empty connector, a cable is not plugged, and 3M adhesive tape is adopted for plugging).
Note: the north-south storage battery pack can be simultaneously or respectively pre-charged.
The embodiment is applied to a domestic new generation PCU-NG high-power and high-orbit satellite for the first time, and the connection safety risk of the PCU-NG and the lithium ion storage battery pack is identified by analyzing the technical characteristics of the PCU-NG, so that a pre-charging method suitable for the connection of the PCU-NG and the lithium ion storage battery pack is designed, and the safety of a power supply system is further improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (6)
1. A PCU-NG is characterized by comprising M groups of BCDR modules, wherein each group of BCDR modules comprises N BCDR modules connected in parallel, and each BCDR module comprises a first input port and a first input port; m is more than or equal to 1, and N is more than or equal to 1;
each group of BCDR modules is correspondingly connected with one group of lithium ion storage batteries, and the lithium ion storage battery pack realizes bus regulation and charging through the BCDR modules; in the same group of BCDR modules, a first input port of each BCDR module is used for being connected to the positive end of the lithium ion storage battery pack in parallel; the second input port of each BCDR module is used for being connected to the negative end of the lithium ion storage battery pack in parallel;
a pre-charging node is arranged in an output port of the PCU-NG, and a pre-charging resistor is connected between the pre-charging node and a common grounding end of 2N parallel BCDR modules.
2. The PCU-NG according to claim 1, wherein the BCDR module further includes an input filter for filtering input interference and stabilizing a bus voltage; the input filter comprises a capacitor C1 and a resistor R1, one end of the capacitor C1 is connected with the first input port, the other end of the capacitor C1 is connected with the resistor R1, the other end of the resistor R1 is grounded and connected with the second input port, and the capacitance value of the capacitor C1 reaches us level.
3. The PCU-NG according to claim 2 wherein said pre-charge resistor is 95-105 ohms.
4. A PCU-NG according to claim 3, characterized in that: the positive end of the lithium ion storage battery pack is connected with first input ports of the N BCDR modules in the PCU-NG through a positive end shunt plug; the negative end of the lithium ion storage battery pack is connected with the second input ports of the N BCDR modules in the PCU-NG through a negative end shunt plug;
the positive side branch plug and the negative side branch plug are both 1-branch N plugs and comprise an input branch and N output branches, the input branch is connected with the positive side or the negative side of the lithium ion storage battery pack, and the N output branches can be independently plugged into a first input port or a second input port of the BCDR module on the PCU-NG.
5. A method of pre-charging a PCU-NG in connection with a lithium ion battery pack as claimed in claim 4, characterized by comprising the steps of:
s1, after the whole satellite cable network is laid in place, before the lithium ion storage battery is installed, leading the output port of the PCU-NG to a plug installed on the satellite surface through cable connection;
s2, keeping the lithium ion battery pack connector not inserted, and keeping all nodes on the connector in a suspended state to ensure that the nodes are not connected to a satellite ground;
s3, connecting the input branch of the branching plug of the positive end with the positive end of the lithium ion storage battery pack, and connecting the N input branches with the first input port of the BCDR module corresponding to the PCU-NG;
s4, one end of a pre-charging cable is connected with a plug on the surface of the satellite, and the other end of the pre-charging cable is connected with one output branch of the negative terminal shunt plug, so that a pre-charging node in an output port of the PCU-NG is connected with the negative terminal of the lithium ion storage battery pack;
s5, waiting for a preset charging time until the pre-charging is completed, and entering the step S6;
s6, connecting the plug on the surface of the satellite and the rest output branches of the negative side shunt plug to a second input port of the BCDR module corresponding to the PCU-NG;
s7, disconnecting the pre-charging cable from the lithium ion battery pack, and connecting the branch of the negative terminal shunt plug for pre-charging to the port corresponding to PCU-NG;
and S8, disconnecting the pre-charging cable from the satellite surface plug and finishing the pre-charging process.
6. A method of pre-charging a PCU-NG connection to a Li-ion battery pack as claimed in claim 4, characterised in that the pre-set charging time is theoretically not less than 1 s.
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| CN114285115A (en) * | 2021-12-06 | 2022-04-05 | 中国空间技术研究院 | BCDR module autonomous fault diagnosis, isolation and recovery method suitable for PCU-NG |
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