CN117013669A - Portable light storage system - Google Patents

Portable light storage system Download PDF

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Publication number
CN117013669A
CN117013669A CN202210465659.9A CN202210465659A CN117013669A CN 117013669 A CN117013669 A CN 117013669A CN 202210465659 A CN202210465659 A CN 202210465659A CN 117013669 A CN117013669 A CN 117013669A
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CN
China
Prior art keywords
battery
energy storage
loop
heating
module
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CN202210465659.9A
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Chinese (zh)
Inventor
季巧
马泽
马中华
苗翠
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Beijing Machinery Equipment Research Institute
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Beijing Machinery Equipment Research Institute
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Application filed by Beijing Machinery Equipment Research Institute filed Critical Beijing Machinery Equipment Research Institute
Priority to CN202210465659.9A priority Critical patent/CN117013669A/en
Publication of CN117013669A publication Critical patent/CN117013669A/en
Pending legal-status Critical Current

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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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to a portable optical storage system, belongs to the field of electrical engineering and the field of new energy, and solves the problems that energy loss of an energy storage battery and power supply of a set of energy storage battery to a fixed load can only be achieved in the prior art. The system comprises an energy storage battery, a PCS energy storage converter, a photovoltaic module, a photovoltaic controller and a control module, wherein the energy storage battery comprises a main loop for charging and discharging and a heating loop for heating the battery; the main loop and the heating loop are connected through a relay S1; the photovoltaic module is connected with the heating loop through a photovoltaic controller and is connected with the main loop through a relay S1 and used for heating or charging the energy storage battery; the PCS energy storage converter is connected with the main loop and is used for charging an energy storage battery or outputting battery electric energy; the control module is used for controlling the on-off of the relay S1, so that the charging or heating control of the energy storage battery is realized. The energy storage battery power supply device has the advantages that the energy consumption of the energy storage battery is reduced, and a set of energy storage battery can supply power for equipment with various voltage levels.

Description

Portable light storage system
Technical Field
The application relates to the field of electrical engineering and new energy, in particular to a portable optical storage system.
Background
The portable optical storage system can provide electric energy in a field severe environment, and is an important technical means for realizing the full-region, full-time-domain and multi-dimensional seamless connection guarantee of power supply guarantee. With the continuous development and maturity of new energy technology, lithium ion batteries are increasingly applied to various fields, and application scenes of energy storage battery systems are also more and more diversified, so that higher requirements are provided for a serial-parallel grouping mode of batteries.
The existing energy storage battery system is generally composed of single batteries in a fixed serial-parallel connection mode, the voltage and the current of the battery system are in a relatively fixed range, the application scene is relatively fixed, and the energy storage battery system can only be used in a specific environment to supply power to relatively fixed loads. If one wants to use the same energy storage battery system to supply loads with different voltage levels, power electronics such as DC/DC are added to change the voltage levels, which not only increases the cost of use, but also increases the complexity of the use and operation of the battery system.
When the portable optical storage module is charged by the photovoltaic under the low-temperature condition, the portable optical storage module needs to be heated firstly, the main loop of the energy storage battery is connected with the heating loop in parallel in the past, the energy storage battery and the photovoltaic are heated together when the energy storage battery is heated, the photovoltaic power is greatly influenced by weather conditions, and the heating power of the energy storage battery is mainly provided by the energy storage battery when the illumination intensity is insufficient, so that unnecessary energy waste is caused.
Disclosure of Invention
In view of the above analysis, the present application is directed to a portable optical storage system, which is used to solve the problems of energy loss of an energy storage battery and power supply of a set of energy storage battery to a fixed load in the prior art.
In one aspect, an embodiment of the application provides a portable optical storage system, which comprises an energy storage battery, a PCS energy storage converter, a photovoltaic module, a photovoltaic controller and a control module, wherein the energy storage battery comprises a main circuit for charging and discharging and a heating circuit for heating the battery; the main loop and the heating loop are connected through a relay S1;
the photovoltaic module is connected with the heating loop through a photovoltaic controller and is connected with the main loop through a relay S1 and used for heating or charging the energy storage battery;
the PCS energy storage converter is connected with the main loop and is used for charging, heating or outputting the electric energy of the energy storage battery;
the control module is connected with the energy storage battery, the PCS energy storage converter and the photovoltaic controller, acquires state parameters of the energy storage battery, the PCS energy storage converter and the photovoltaic module, and controls on-off of the energy storage battery, the PCS energy storage converter and the relay S1 according to the state parameters, so that charging or heating control of the energy storage battery is realized.
Further, the energy storage battery further comprises a battery module, a power module and a BMS energy management system; the battery module comprises m+n battery strings, positive poles and negative poles of all battery strings are sequentially connected end to end, the negative pole of a first battery string is connected with the negative pole of a main loop of the energy storage battery and the negative pole of the power module, the negative pole of the m+1 battery string is connected with the positive pole of the power module through a loop 2, positive poles of the m+1 to m+n battery strings are all connected with a relay Ki and are connected to a loop 1 in parallel through the relay, one end of the loop 1 is connected with the positive pole of the power module, and the other end of the loop 1 is connected with the positive pole of the main loop of the energy storage battery;
the battery module outputs electric energy to the outside through the main loop and provides electric energy for the BMS energy management system through the power supply module.
Further, the energy storage battery also comprises a heating module and a temperature sensor; the heating module is used for heating the battery and is connected between the anode and the cathode of the heating loop; the heating module comprises a resistor disc and a heating relay;
the temperature sensor is used to measure the battery temperature and transmit the battery temperature to the BMS energy management system.
Further, the state parameters of the energy storage battery comprise battery output power, battery voltage and battery temperature; the state parameters of the photovoltaic module comprise photovoltaic power generation power, and the state parameters of the PCS energy storage converter comprise output voltage, output current and power.
Further, the 1 st to m th strings are welded battery strings, and the m+1 th to m+n th strings are welding-free battery strings.
Further, the positive electrode and the negative electrode of each welding-free battery string are connected with each other, and the BMS energy management system judges whether the battery string has voltage or not according to the voltage value measured by the voltage sensor of each battery string, namely whether the battery string can supply power or not.
Further, when the BMS energy management system monitors that the (m+1) -th string to the (m+s) -th string have voltages, s is any positive integer from 1 to n, the relay Ks of the positive electrode of the (m+s) -th string battery string is controlled to be closed, and the rest relays are all opened; at this time, the voltage of the loop 1 is higher than that of the loop 2, and the loop 1 supplies power for the power module and the main loop. Further, the welding-free battery string can be removed to power a small load.
Furthermore, an anti-reflection diode is added at one end of the loop 2 connected with the power module, and is used for limiting the current flow direction and preventing short circuit from occurring when the welding lithium ion battery string and the welding-free lithium ion battery string are connected in series.
Furthermore, each battery string is formed by connecting a plurality of battery cells in parallel, and the number of the single batteries connected in parallel in each battery string is equal.
Compared with the prior art, the application has at least one of the following beneficial effects:
1. the control module controls the relay S1 to open and close, the main loop and the heating loop of the energy storage battery are disconnected under the low-temperature condition, and only the photovoltaic module heats the energy storage battery, so that the energy loss of the energy storage battery is reduced.
2. By setting the battery string of the battery module to be in a welding-free form, the welding-free battery string is accessed or taken out according to the requirement, so that the limitation that the traditional battery system can only supply power to relatively fixed loads in a specific environment is avoided.
3. The battery module is provided with the welding-free battery string, when the load is increased, the control module is connected with the (m+1) -th to (m+s) -th battery strings through the relay for controlling the welding-free battery string, and the battery strings are connected in series to supply power for the load together, when the small load is required to be supplied with power, the welding-free battery string can be directly taken out to supply power for the small load, namely, the energy storage battery can be provided with a plurality of using methods according to the user requirements, so that the energy storage battery is suitable for power supply in load change and has more flexibility.
In the application, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the application, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is an electrical schematic diagram of a portable optical storage system
FIG. 2 is an electrical schematic diagram of the interior of an energy storage battery
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
In one embodiment of the present application, a portable optical storage system is disclosed, as shown in FIG. 1. The optical storage system comprises an energy storage battery, a PCS energy storage converter, a photovoltaic module, a photovoltaic controller and a control module, wherein the energy storage battery comprises a main circuit for charging and discharging and a heating circuit for heating the battery; the main loop and the heating loop are connected through a relay S1;
the photovoltaic module is connected with the heating loop through a photovoltaic controller and is connected with the main loop through a relay S1 and used for heating or charging the energy storage battery;
the PCS energy storage converter is connected with the main loop and is used for charging, heating or outputting the electric energy of the energy storage battery;
the control module is connected with the energy storage battery, the PCS energy storage converter and the photovoltaic controller, acquires state parameters of the energy storage battery, the PCS converter and the photovoltaic module, and controls on-off of the energy storage battery, the PCS energy storage converter and the relay S1 according to the state parameters, so that charging or heating control of the energy storage battery is realized.
In implementation, control electricity of the PCS energy storage converter and the control module is obtained from a main loop of the energy storage battery, and control electricity of the photovoltaic controller is obtained from the photovoltaic module.
Further, the photovoltaic module is a solar power generation plate, solar energy is converted into electric energy, the maximum power generation power is 400W, and the external interface is provided with a photovoltaic output anode and a photovoltaic output cathode;
the energy storage battery has the functions of storing electric energy, and an external interface is provided with CANH and CANL for CAN communication, ON+ and ON-for battery power-ON, an anode and a cathode of a main loop and an anode and a cathode of a heating loop.
Specifically, the state parameters of the energy storage battery include battery output power, battery voltage and battery temperature; the state parameters of the photovoltaic module comprise photovoltaic power generation power; the state parameters of the PCS energy storage converter include output voltage, output current and power.
Further, the photovoltaic power generation power is collected and controlled by a photovoltaic controller. And the photovoltaic controller sends photovoltaic power generation power to the control module, so that the control module can conveniently control the charge and discharge of the battery.
Specifically, as shown in fig. 2, the energy storage battery further includes a battery module, a power module, and a BMS energy management system; the battery module comprises m+n battery strings, positive poles and negative poles of all battery strings are sequentially connected end to end, the negative pole of a first battery string is connected with the negative pole of a main loop of the energy storage battery and the negative pole of the power module, the negative pole of the m+1 battery string is connected with the positive pole of the power module through a loop 2, positive poles of the m+1 to m+n battery strings are all connected with a relay Ki and are connected to a loop 1 in parallel through the relay, one end of the loop 1 is connected with the positive pole of the power module, and the other end of the loop 1 is connected with the positive pole of the main loop of the energy storage battery;
the battery module outputs electric energy to the outside through the main loop and provides electric energy for the BMS energy management system through the power supply module.
Specifically, the power module may be a DC/DC converter for converting a battery voltage into an operating voltage of the BMS energy management system.
Further, the positive poles of the battery strings from the (m+1) th string to the (m+n) th string are also connected with fuses, and the fuses are connected in series with the corresponding relays Ki; the fuse can be timely fused when the battery string connection fails, and plays a role in protecting the battery string.
Specifically, the energy storage battery further comprises a heating module; the heating module comprises a resistor disc and a heating relay. The heating module is connected between the positive pole and the negative pole of the heating loop.
Further, the heating circuit further comprises a fuse, and the fuse can be timely fused when the heating circuit fails, so that the heating circuit is protected.
Specifically, the negative pole of heating circuit is connected to the one end of fuse, and the one end of resistance card is connected to the other end, and the one end of heating relay is connected to the other end of resistance card, and the positive pole of heating circuit is connected to the other end of heating relay.
Specifically, the energy storage battery further comprises a temperature sensor for detecting the temperature of the battery; the temperature sensor is connected with the BMS energy management system and transmits measured temperature data to the BMS energy management system, and meanwhile, the BMS energy management system transmits battery temperature data to the control module through CAN communication.
When the energy storage system is in a discharging or charging mode, the BMS energy management system can control the heating relay to be opened and closed according to the battery temperature data, so that the battery is automatically heated.
The BMS energy management system CAN also detect battery voltage and current, calculate battery output power, and send state parameters (including battery output power, battery voltage and battery temperature) of the energy storage battery to the control module through the CAN bus.
Specifically, the energy storage battery still includes the charging loop, and the charging loop includes charging relay and anti-reverse diode, and two parallel connection charge loop's one end is connected with return circuit 1, and the other end is connected with the positive pole of main loop.
Specifically, the energy storage battery further comprises a pre-discharge loop, and the pre-discharge loop is connected in series between the loop 1 and the charging loop; the pre-discharge loop comprises a positive electrode relay, a pre-discharge relay and a pre-discharge resistor, and the pre-discharge relay and the pre-discharge resistor are connected in series and then connected with the positive electrode relay in parallel.
Further, the pre-discharge loop is used for preventing the overlarge voltage difference between the direct-current bus voltage and the main loop voltage when the energy storage battery discharges, so as to cause overcurrent faults;
specifically, when the battery discharges outwards, the BMS controls the charging relay to be opened, the pre-charging and discharging relay to be closed, the positive relay to be opened, and the battery performs pre-discharge outwards;
when the BMS energy management system detects that the output voltage of the main loop is approximately equal to the voltage of the direct current bus, the positive relay is controlled to be closed, the pre-discharging relay and the charging relay are controlled to be opened, and the voltage is discharged to the outside through the anti-reverse diode.
Specifically, a voltage sensor is arranged at the connection position of the positive electrode and the negative electrode of each welding-free battery string, and the BMS energy management system judges whether the battery string has voltage or not according to the voltage value measured by the voltage sensor of each battery string.
Further, the BMS controls the charging relay and the positive relay to be closed in the charging mode of the energy storage battery.
Specifically, when the energy storage system is in a charging mode, the control module judges whether the photovoltaic power generation power is greater than a set power threshold, if so, the control module judges whether the battery temperature is lower than a heating temperature threshold, and when the battery temperature is lower than the heating temperature threshold, the control module controls the relay S1 to be disconnected, the BMS energy management system controls the heating relay to be closed, and the photovoltaic module heats the energy storage battery through the photovoltaic controller; when the temperature of the energy storage battery rises to a charging temperature threshold value, the BMS energy management system controls the heating relay to be opened, controls the charging relay to be closed, and controls the relay S1 to be closed, and the photovoltaic module charges the energy storage battery through the photovoltaic controller;
if the photovoltaic power generation power is not greater than the set power threshold, when the control module detects that mains supply is connected through PCS, the control module controls the relay S1 to be closed, the BMS controls the heating relay to be closed, the PCS heats the energy storage battery through the mains supply, when the temperature of the energy storage battery rises to the charging temperature threshold, the BMS energy management system controls the heating relay to be opened, controls the charging relay to be closed, the control module controls the relay S1 to be opened, and the PCS charges the energy storage battery through the connection of the mains supply.
It will be appreciated that the battery may be charged directly when the battery temperature is not below the heating temperature threshold.
Specifically, the heating temperature threshold is set to 5 degrees celsius, and the charging temperature threshold is set to 10 degrees celsius. The power threshold of the photovoltaic module refers to the output power of the photovoltaic module when the photovoltaic module can work normally.
When the energy storage system is in a charging mode, the control module firstly judges whether the temperature of the energy storage battery is smaller than a heating temperature threshold, if yes, then judges whether the power of the photovoltaic module is larger than the power threshold, if yes, the control relay S1 is opened, the BMS energy management system controls the heating relay to close the photovoltaic module to heat the energy storage battery through the photovoltaic controller, when the energy storage system is heated to a discharging temperature threshold, the BMS energy management system controls the heating relay to be opened, the control module controls the relay S1 to close, and the photovoltaic module supplies power to a load through the photovoltaic controller;
at this time, if the photovoltaic power generation power is greater than the load power, the photovoltaic module alone supplies power to the load, and the residual power charges the energy storage battery; when the photovoltaic power generation power is smaller than the load power, the control module detects whether commercial power is connected through the PCS, and when the commercial power is connected, the control module supplies power to the load through the PCS; when no mains supply is connected, the BMS controls the pre-discharge relay to be closed, and the energy storage battery and the photovoltaic module supply power for the load.
If the photovoltaic power generation power is not greater than the power threshold, the control module detects whether mains supply is connected through the PCS, and when the mains supply is connected, the control module controls the PCS to supply power for the load; when no mains supply is connected, the BMS controls the pre-discharge relay to be closed, and the energy storage battery supplies power to the load.
When the temperature of the battery is not lower than the discharge temperature threshold, the battery can be directly discharged to the outside without heating.
Specifically, the heating temperature threshold is set to 5 degrees celsius, and the discharge temperature threshold is set to 10 degrees celsius.
Specifically, the PCS is an energy storage converter, namely a bidirectional AC/DC, 220VAC can be converted into direct current to charge a battery, the direct current of the battery can be converted into 220VAC to externally supply power, the rated power is 500W, direct current positive and negative poles DC+, DC-, alternating current inputs GL and GN are arranged at an external interface, alternating current outputs LL and LN (L is a live wire, N is a zero line), and a parallel communication interface CANH2 and CANL2 and CANH1 communicated with a control module are connected;
the PCS rated power in one set of optical storage system is 500W, and when the power supply requirement is larger than the rated power, one set of optical storage system cannot meet the requirement, and at the moment, a plurality of sets of optical storage systems are required to be combined to meet the larger power supply requirement. For example, if the power of the load is 2000W, 4 optical storage systems are needed to be connected in parallel to meet the power supply requirement. At present, at most 12 optical storage systems can be combined, and the power supply requirement of 6kW can be met. The parallel operation needs to combine the parallel operation communication CAN communication of a plurality of PCS to a CAN bus so as to ensure that the amplitude and the phase of 220V alternating current output by each PCS are consistent. And the parallel CAN communication of the control module is the same.
The alternating current output and the alternating current input of each PCS are sequentially connected, the parallel operation communication ports CANH2 and CANL2 are sequentially connected, the CANH and the CANL of each control module are sequentially connected, each PCS is connected with the corresponding control module CANH1 port and the CANL1 port, parallel operation is completed, and the alternating current output of the last PCS is connected with a load. During parallel operation, 4 corresponding PCS and control modules are used as a group of parallel operation modules, the 4 modules are connected in parallel, and the parallel alternating current output and the outputs of other groups supply power to the load through the bus.
When the online number of the parallel operation modules is less than 5, a competition master-slave mode is adopted, and when the online number of the modules is greater than or equal to 5, 4 modules are set to be in the competition master-slave mode, the other modules are set to be in the master-slave mode, and the other modules are set to be slaves. When the modules are connected in parallel, the host sends the set value of the slave current loop through the parallel CAN frame, and the set value of the slave current loop is the same as the set value of the host, so that the effect that the output power of each module is the same is achieved.
The maximum load of the energy band of a group of parallel operation modules is 2.4kW, the rated current of the alternating current output is 10A, and when the number of the groups exceeds 4 in the parallel operation process, the alternating current output port can be possibly damaged, so that a 10A fuse is added before the alternating current output for protection.
Specifically, the 1 st to m th strings of battery strings are welded battery strings, and the m+1 th to m+n th strings of battery strings are welding-free battery strings.
Further, the energy storage battery further comprises a local power-on switch connected between the power module and the BMS energy management system.
The local power-on switch is pressed down, the contacts of the main loop of the default relays K1-Kn are in an off state, and at the moment, current is supplied to the BMS through the power module from the loop 2 through the welded battery string; BMS is electrified and self-tests, and the BMS can work normally after the self-tests are completed.
Specifically, a voltage sensor is arranged at the connection position of the positive electrode and the negative electrode of each welding-free battery string, and the BMS energy management system judges whether the battery string has voltage or not according to the voltage value measured by the voltage sensor of each battery string.
When the BMS energy management system monitors that the (m+1) -th string to the (m+s) -th string have voltages, wherein s is any positive integer from 1 to n, controlling the relays Ks corresponding to the (m+s) -th string battery string to be closed, and opening the rest relays; at this time, the voltage of the loop 1 is higher than that of the loop 2, and the loop 1 supplies power for the power module and the main loop.
In particular, the welding-free battery string can be taken out to supply power for a small load.
Further, when the welding-free battery string is disassembled, it should be ensured that the energy storage battery is in a stopped state, and the disassembly should be started from the last, i.e., m+n-th battery string. If only the (m+n) -th string of welding-free battery strings is removed, the BMS energy management system only controls the relay Kn-1 of the (m+n) -th string of battery strings to be closed, other relays are all opened, at the moment, the energy storage battery is connected with the (m+n) -th string of battery strings in series to supply power to the outside, and the (m+n) -th string of welding-free battery strings can also independently supply power for loads with small voltage levels. If the two battery strings of the (m+n) -th string and the (m+n-1) -th string are disassembled, the BMS controls the relay Kn-2 of the (m+n-2) -th string to be closed, and other relays are all opened; the rest and so on.
Further, when the detached welding-free battery string is mounted, it should be ensured that the SOC of the energy storage battery is the same and the energy storage system is in a stopped state, and the mounting should be started from the forefront end, i.e., the (m+1) th battery string. If only 1 welding-free battery string is installed, the access part of the (m+1) th battery string should be placed, the BMS energy management system controls the relay K1 of the (m+1) th battery string to be closed, and the rest relays are all opened. If the battery strings are installed with 2 welding-free battery strings, the battery strings are respectively placed at the access positions of the (m+1) th battery string and the (m+2) th battery string, the BMS energy management system controls the relay K2 of the (m+2) th battery string to be closed, and other relays are opened. The rest and so on.
Further, when the BMS energy management system monitors that the m+1th string to the m+s th string have voltages, and the m+s+1th string has no voltage, the BMS energy management system only controls the relay Ks to be closed no matter whether the welding-free battery string is connected after the m+s th string. The BMS energy management system always allows only consecutive groups of welding-free batteries to be accessed after being mounted to a welding battery string.
Further, the portable optical storage system further comprises a battery string charging module for charging the detached welding-free battery string.
Furthermore, when the detached welding-free battery string is installed, the welding battery string and the welding-free battery string are charged to the same state of charge of the batteries, so that the condition that a certain battery string is overcharged or overdischarged during combined use is avoided, and the service life of the whole energy storage battery system is prolonged.
Further, the BMS energy management system may be powered by a welding-free battery string and a welding-battery string two-part battery string.
Specifically, an anti-reflection diode is added at one end of the loop 2 connected with the power module, and is used for limiting the current flow direction and preventing short circuit from occurring when the welding lithium ion battery string and the welding-free lithium ion battery string are connected in series.
Specifically, each battery string is formed by connecting a plurality of battery cells in parallel, and the number of the single batteries connected in parallel in each battery string is equal.
Compared with the prior art, the portable light storage system provided by the embodiment is provided with a welding battery string and a welding-free battery string serial system, and the same light storage system can supply power to loads with different voltage levels without external power electronic equipment by connecting or disconnecting the welding-free battery string: the whole light storage system can supply power to a load with high voltage level, and a certain group or a plurality of groups of battery strings can be taken out independently to supply power to a load with low voltage level; through setting up relay S1 between main circuit and heating circuit, with main circuit and heating circuit separation, avoid the battery to utilize self energy to reduce the electric energy loss of energy storage battery self for the battery heating to reduce unnecessary energy loss, further promote energy utilization efficiency.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.

Claims (10)

1. A portable optical storage system, characterized by: the optical storage system comprises an energy storage battery, a PCS energy storage converter, a photovoltaic module, a photovoltaic controller and a control module, wherein the energy storage battery comprises a main circuit for charging and discharging and a heating circuit for heating the battery; the main loop and the heating loop are connected through a relay S1;
the photovoltaic module is connected with the heating loop through a photovoltaic controller and is connected with the main loop through a relay S1 and used for heating or charging the energy storage battery;
the PCS energy storage converter is connected with the main loop and is used for charging, heating or outputting the electric energy of the energy storage battery;
the control module is connected with the energy storage battery, the PCS energy storage converter and the photovoltaic controller, acquires state parameters of the energy storage battery, the PCS energy storage converter and the photovoltaic module, and controls on-off of the energy storage battery, the PCS energy storage converter and the relay S1 according to the state parameters, so that charging or heating control of the energy storage battery is realized.
2. A portable light storage system as defined in claim 1, wherein: the energy storage battery further comprises a battery module, a power module and a BMS energy management system; the battery module comprises m+n battery strings, positive poles and negative poles of all battery strings are sequentially connected end to end, the negative pole of a first battery string is connected with the negative pole of a main loop of the energy storage battery and the negative pole of the power module, the negative pole of the m+1 battery string is connected with the positive pole of the power module through a loop 2, positive poles of the m+1 to m+n battery strings are respectively connected with a relay Ki and are connected to a loop 1 in parallel through the relay, one end of the loop 1 is connected with the positive pole of the power module, and the other end of the loop 1 is connected with the positive pole of the main loop of the energy storage battery;
the battery module outputs electric energy to the outside through the main loop and supplies power to the BMS energy management system through the power supply module.
3. The portable light storage system of claim 2 wherein the energy storage battery further comprises a heating module and a temperature sensor; the heating module is used for heating the battery and is connected between the anode and the cathode of the heating loop; the heating module comprises a resistor disc and a heating relay;
the temperature sensor is used to measure the battery temperature and transmit the battery temperature to the BMS energy management system.
4. A portable light storage system as recited in claim 3, wherein said state parameters of said energy storage battery include battery output power, battery voltage, battery temperature; the state parameters of the photovoltaic module comprise photovoltaic power generation power, and the state parameters of the PCS energy storage converter comprise output voltage, output current and power.
5. The portable optical storage system of claim 2, wherein the 1 st to m th strings of cells are welded strings of cells, and the m+1 th to m+n th strings of cells are welding-free strings of cells.
6. The portable light storage system of claim 5 wherein a voltage sensor is provided at the positive and negative connection of each welding-free battery string, and the BMS energy management system determines whether the battery string has a voltage based on the voltage value measured by the voltage sensor of each battery string.
7. The portable light and storage system of claim 6 wherein when the BMS energy management system monitors that the m+1st to m+s th strings each have a voltage, wherein s is any one of positive integers from 1 to n, the relays Ks controlling the anodes of the m+s th strings are closed and the remaining relays are opened; at this time, the voltage of the loop 1 is higher than that of the loop 2, and the loop 1 supplies power for the power module and the main loop.
8. The portable light storage system of claim 7 wherein the welding-free battery string is removable to power a small load.
9. The portable optical storage system of claim 7, wherein an anti-reflection diode is added to the end of the loop 2 connected to the power module.
10. The portable light storage system of claim 8 wherein each battery string is formed by a plurality of battery cells connected in parallel, and the number of cells connected in parallel in each battery string is equal.
CN202210465659.9A 2022-04-29 2022-04-29 Portable light storage system Pending CN117013669A (en)

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Application Number Priority Date Filing Date Title
CN202210465659.9A CN117013669A (en) 2022-04-29 2022-04-29 Portable light storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210465659.9A CN117013669A (en) 2022-04-29 2022-04-29 Portable light storage system

Publications (1)

Publication Number Publication Date
CN117013669A true CN117013669A (en) 2023-11-07

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CN202210465659.9A Pending CN117013669A (en) 2022-04-29 2022-04-29 Portable light storage system

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