A sorting and assembly system based on the dynamic characteristics of double-string lithium batteries

Abstract

The present invention belongs to the field of electrochemical energy storage application technology, and specifically relates to a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries. Based on the fact that the charging and discharging of lithium-ion batteries in electrochemical energy storage is a dynamic process of electrochemical reactions, the charging and discharging electronic systems of two battery strings are exchanged with electric energy to complete the energy-saving charging and discharging process, and the dynamic monitoring and statistical analysis data of each battery cell are compared, so that the battery string assembly can meet the product performance standards and the dynamic consistency error range requirements allowed by the application scenario, breaking through the conventional means of static detection and sorting based on the existing technology, and innovating a new system of dynamic assembly and sorting, reducing the inconsistency in the operation of the energy storage system, improving resource utilization and application efficiency, and more importantly, greatly reducing the damage to the battery cells and improving the inconsistency of the battery string, thereby improving the efficiency and safety of the energy storage system operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical energy storage application, and in particular relates to a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries. Background Art

[0002] Large-scale electrochemical battery energy storage systems, especially lithium-ion batteries, require a large number of small-capacity single cells connected in series and parallel with PCS and BMS to form an energy storage unit system, and are mostly integrated and applied in the form of installation in a dedicated container room. As we all know, the safety of lithium-ion batteries is the fundamental guarantee for the application of energy storage systems. Without safety, the application value of energy storage systems is lost; and the consistency of the electrical performance of lithium-ion batteries is one of the important conditions to ensure the safe application of a large number of small-capacity lithium-ion battery cells in series. Inconsistency not only affects resource utilization and efficiency, but more seriously, it will cause damage to battery cells and aggravate their inconsistency, causing great safety hazards.

[0003] In the prior art, before lithium battery cells are connected in series to form a battery string, the static voltage and internal resistance of each battery cell are measured, and the battery string is sorted accordingly. Since the charging and discharging of lithium-ion batteries for electrochemical energy storage is a dynamic process of electrochemical reaction, there is a significant difference between the static consistency and dynamic consistency. For energy storage systems, dynamic operation is a normal state, and the depth control of battery charging and discharging is mainly based on dynamic parameters. Dynamic consistency is the fundamental guarantee for the safety of lithium-ion battery string operation. Therefore, the prior art adopts static detection and lithium battery string sorting, which is not suitable for energy storage system applications with frequent charging and discharging, and has obvious technical defects. Summary of the invention

[0004] To ensure the safe, healthy and efficient application of large-scale electrochemical battery energy storage systems, especially lithium-ion battery energy storage systems, it is necessary to break through the conventional means of static detection and grouping and sorting based on the existing technology, and innovate a new system of dynamic grouping and sorting. Therefore, the present invention proposes a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries, which mainly includes: a system control module, a system control bus, a power grid, an AC power line, a power grid access disconnect switch, a first battery parameter signal acquisition module, a first single battery of the first battery string, a second single battery of the first battery string, an nth single battery of the first battery string, a first signal acquisition line of the first battery string, a second signal acquisition line of the first battery string, a third signal acquisition line of the first battery string, an nth signal acquisition line of the first battery string, an n+1th signal acquisition line of the first battery string, a positive connection terminal of the first battery string, a negative connection terminal of the first battery string, a positive DC protection and an electric control switch of the first battery string, a negative DC protection and an electric control switch of the first battery string, and a 1 energy storage bidirectional inverter module, AC output protection and electronically controlled switch of the first energy storage bidirectional inverter module, the second battery parameter signal acquisition module, the first single battery of the second battery string, the second single battery of the second battery string, the nth single battery of the second battery string, the first signal acquisition line of the second battery string, the second signal acquisition line of the second battery string, the third signal acquisition line of the second battery string, the nth signal acquisition line of the second battery string, the n+1th signal acquisition line of the second battery string, the positive connection terminal of the second battery string, the negative connection terminal of the second battery string, the positive DC protection and electronically controlled switch of the second battery string, the negative DC protection and electronically controlled switch of the second battery string, the second energy storage bidirectional inverter module, AC output protection and electronically controlled switch of the second energy storage bidirectional inverter module, wherein:

[0005] The positive and negative electrodes of the adjacent single cells in the first battery string, the second battery in the first battery string, and the nth battery in the first battery string are sequentially connected in series to form a first battery series string, wherein the positive electrode of the battery string is sequentially connected to the positive electrode of the DC side of the first energy storage bidirectional inverter module through the positive electrode connection terminal of the first battery string, the positive electrode DC protection of the first battery string, and the electric control switch, and the negative electrode of the battery string is sequentially connected to the negative electrode of the DC side of the first energy storage bidirectional inverter module through the negative electrode connection terminal of the first battery string, the negative electrode DC protection of the first battery string, and the electric control switch, and then the first energy storage bidirectional inverter module is connected to the AC power line through the AC output protection and the electric control switch of the first energy storage bidirectional inverter module and connected to the grid through the grid access disconnect switch, forming a power path for the charging and discharging electronic system of the first battery string to charge and discharge through the grid;

[0006] The positive and negative electrodes of the adjacent single cells in the first single cell of the second battery string, the second single cell of the second battery string, and the nth single cell of the second battery string are sequentially connected in series to form a second battery series string, wherein the positive electrode of the battery string is sequentially connected to the positive electrode of the DC side of the second energy storage bidirectional inverter module through the positive electrode connection terminal of the second battery string, the positive electrode DC protection of the second battery string, and the electric control switch, and the negative electrode of the battery string is sequentially connected to the negative electrode of the DC side of the second energy storage bidirectional inverter module through the negative electrode connection terminal of the second battery string, the negative electrode DC protection of the second battery string, and the electric control switch, and then the second energy storage bidirectional inverter module is connected to the AC power line through the AC output protection and the electric control switch of the second energy storage bidirectional inverter module and connected to the grid through the grid access disconnect switch, forming a power path for the second battery string charging and discharging electronic system to charge and discharge through the grid;

[0007] At the same time, the power path for charging and discharging the first battery string charging and discharging electronic system is connected to the power path for charging and discharging the second battery string charging and discharging electronic system through an AC power line, forming a power path for mutual charging and discharging between the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system;

[0008] A battery string having n single batteries connected in series is configured with n+1 signal acquisition lines, ensuring that the positive and negative electrodes of each battery cell are connected to a battery parameter signal acquisition module by a signal acquisition line, that is, the first battery parameter signal acquisition module is connected to the first single battery of the first battery string, the second single battery of the first battery string, and the nth single battery of the first battery string in sequence through the first signal acquisition line of the first battery string, the second signal acquisition line of the first battery string, the third signal acquisition line of the first battery string, the nth signal acquisition line of the first battery string, and the n+1th signal acquisition line of the first battery string, respectively, to form an information link for the first battery parameter signal acquisition module to collect information of each battery cell of the first battery string;

[0009] At the same time, the second battery parameter signal acquisition module is connected to the first single battery of the second battery string, the second single battery of the second battery string, and the nth single battery of the second battery string in sequence through the first signal acquisition line of the second battery string, the second signal acquisition line of the second battery string, the third signal acquisition line of the second battery string, the nth signal acquisition line of the second battery string, and the n+1th signal acquisition line of the second battery string, respectively, to form an information link for the second battery parameter signal acquisition module to collect information from each battery cell of the second battery string;

[0010] The system control module is connected to the first battery parameter signal acquisition module, the first battery string positive pole DC protection and electric control switch, the first battery string negative pole DC protection and electric control switch, the first energy storage bidirectional inverter module, the first energy storage bidirectional inverter module AC output protection and electric control switch, the second battery parameter signal acquisition module, the second battery string positive pole DC protection and electric control switch, the second battery string negative pole DC protection and electric control switch, the second energy storage bidirectional inverter module, the second energy storage bidirectional inverter module AC output protection and electric control switch through the system control bus, forming a communication link for the system control module to perform real-time monitoring of battery cells, process lithium battery group sorting information, and control system operation;

[0011] An operation control method of a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries is:

[0012] All lithium batteries are grouped in strings before use, and each time two strings are charged and discharged dynamically, they are sorted and grouped, that is, in each of the two strings, the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system are used to exchange electric energy for energy-saving charging and discharging, and at the same time, the voltage, current, power, temperature and corresponding changing information data of each battery cell are monitored and signal data is collected. The system control module monitors the information of each battery cell of the first battery string and the second battery string through the first battery parameter signal acquisition module and the second battery parameter signal acquisition module respectively. When the operating conditions are normal, the system control module controls the operating modes of the first energy storage bidirectional inverter module and the second energy storage bidirectional inverter module respectively, one of which is a voltage source V / F operating mode and the other is a current source In the P / Q operation mode, the system control module adjusts the power of the energy storage bidirectional inverter module in the current source P / Q operation mode to implement the charging and discharging process that meets the battery characteristics, and monitors and records the voltage, current, power, temperature and corresponding change information data of each battery cell in real time, and completes at least one charging and discharging cycle. The system control module statistically analyzes the voltage, current, power, temperature and corresponding change information data of each battery cell collected in real time according to the corresponding processing method of the preset program, compares the dynamic monitoring and statistical analysis data of each single battery of the two battery strings, and performs grouping and sorting according to the consistency error range of product standards and application scenario requirements, so that the battery string assembly can meet and achieve the consistency error range requirements of product standards and application scenario requirements;

[0013] Since the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system perform energy-saving charging and discharging by exchanging electric energy, a small amount of electric energy loss will be generated, and electric power is supplemented by the power grid. The system control module controls the energy storage bidirectional inverter module in the voltage source V / F operation mode to control the standby of the corresponding battery string when the power of the battery string reaches the protection value, so that the energy storage bidirectional inverter module in the current source P / Q operation mode and the corresponding battery string exchange electric energy with the power grid to complete the whole process of charging and discharging.

[0014] A sorting and assembly system based on the dynamic characteristics of double-string lithium batteries, the system control module mainly includes: an embedded controller, a data storage circuit, a clock circuit, a power supply circuit, a communication management circuit, an I / O management circuit, a control module bus, and a preset program module, wherein:

[0015] The embedded controller is connected to the data storage circuit, clock circuit, power circuit, communication management circuit, I / O management circuit and preset program module respectively through the control module bus to form the monitoring information link and system module of the system control module.

[0016] A sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries, wherein the battery parameter signal acquisition module is characterized in that when the number of single cells in a battery string is greater than the maximum signal acquisition line of the battery parameter signal acquisition module minus 1, two or more battery parameter signal acquisition modules are used to jointly form an information link using each battery cell in the battery string, and the number of battery parameter signal acquisition modules is greater than the number of single cells in the battery string / an integer of the maximum signal acquisition line number of the battery parameter signal acquisition module minus 1.

[0017] The present invention discloses a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries. According to the fact that the charging and discharging of lithium-ion batteries in electrochemical energy storage is a dynamic process of electrochemical reaction, and actual application practice has proved that the dynamic operation of the energy storage system is a normal state, two battery string charging and discharging electronic systems are exchanged with electric energy to complete the energy-saving charging and discharging process, and the dynamic monitoring and statistical analysis data of each battery cell are compared. The battery string is assembled and sorted according to the battery product characteristic standard and the dynamic consistency error range allowed by the application scenario, so that the battery string assembly can meet and reach the product performance standard and the dynamic consistency error range requirement allowed by the application scenario. The conventional means of static detection and assembly and sorting based on the static detection in the prior art is broken through, and a new system of dynamic assembly and sorting is innovated, which reduces the inconsistency in the operation of the energy storage system, not only improves the resource utilization and use efficiency, but more importantly greatly reduces the damage of the battery cell and improves the inconsistency of the battery string, thereby improving the safety and efficiency of the operation of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic block diagram of the principle of a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries.

[0019] Figure 2 This is a schematic diagram of the composition principle of the system control module. DETAILED DESCRIPTION

[0020] As an implementation example, a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries is described in conjunction with the accompanying drawings. However, the technology and solution of the present invention are not limited to the contents given in this implementation example.

[0021] like Figure 1 As shown, a sorting and assembly system based on the dynamic characteristics of a double-string lithium battery mainly comprises: a system control module (011), a system control bus (012), a power grid (013), an AC power line (014), a power grid access disconnect switch (015), a first battery parameter signal acquisition module (10), a first single battery (101) of a first battery string, a second single battery (102) of a first battery string, an nth single battery (10n) of a first battery string, and a first signal signal collection line (111), a second signal collection line (112) of the first battery string, a third signal collection line (113) of the first battery string, an nth signal collection line (11n) of the first battery string, an n+1th signal collection line (11n+1) of the first battery string, a positive electrode connection terminal (11) of the first battery string, a negative electrode connection terminal (12) of the first battery string, a positive electrode DC protection and electric control switch (13) of the first battery string, and a negative electrode DC protection and electric control switch (14) of the first battery string , a first energy storage bidirectional inverter module (15), an AC output protection and electric control switch of the first energy storage bidirectional inverter module (16), a second battery parameter signal acquisition module (20), a first single battery (201) of a second battery string, a second single battery (202) of a second battery string, an nth single battery (20n) of a second battery string, a first signal acquisition line (211) of a second battery string, a second signal acquisition line (212) of a second battery string, and a third signal acquisition line (213) of a second battery string. 213), the nth signal acquisition line (21n) of the second battery string, the n+1th signal acquisition line (21n+1) of the second battery string, the positive connection terminal (21) of the second battery string, the negative connection terminal (22) of the second battery string, the positive DC protection and electric control switch (23) of the second battery string, the negative DC protection and electric control switch (24) of the second battery string, the second energy storage bidirectional inverter module (25), the AC output protection and electric control switch (26) of the second energy storage bidirectional inverter module, wherein:

[0022] The first single storage battery (101) of the first storage battery string, the second single storage battery (102) of the first storage battery string, and the adjacent single storage battery in the nth single storage battery (10n) of the first storage battery string are connected in series in sequence to form a first storage battery series string. The positive electrode of the storage battery string is connected to the positive electrode of the DC side of the first energy storage bidirectional inverter module (15) in sequence through the positive electrode connection terminal (11) of the first storage battery string and the positive electrode DC protection and electric control switch (13) of the first storage battery string. At the same time, the negative electrode of the storage battery string is connected in sequence to the positive electrode of the DC side of the first energy storage bidirectional inverter module (15). The first battery string negative electrode is connected to the negative electrode of the DC side of the first energy storage bidirectional inverter module (15) through the negative electrode connection terminal (12) of the first battery string and the negative electrode DC protection and electric control switch (14), and then the first energy storage bidirectional inverter module (15) is connected to the AC power line (014) through the first energy storage bidirectional inverter module AC output protection and electric control switch (16) and connected to the power grid (013) through the power grid access disconnect switch (015), thereby forming a power path for the first battery string charging and discharging electronic system to charge and discharge through the power grid;

[0023] The first single storage battery (201) of the second storage battery string, the second single storage battery (202) of the second storage battery string, and the adjacent single storage battery positive and negative electrodes in the nth single storage battery (20n) of the second storage battery string are sequentially connected in series to form a second series storage battery string. The positive electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the second energy storage bidirectional inverter module (25) through the second storage battery string positive electrode connection terminal (21) and the second storage battery string positive electrode DC protection and electric control switch (23). At the same time, the negative electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the second energy storage bidirectional inverter module (25). The negative pole of the DC side of the second energy storage bidirectional inverter module (25) is connected to the negative pole of the second battery string through the negative pole connection terminal (22) and the negative pole DC protection and electric control switch (24) of the second battery string, and then the second energy storage bidirectional inverter module (25) is connected to the AC power line (014) through the second energy storage bidirectional inverter module AC output protection and electric control switch (26) and connected to the power grid (013) through the power grid access disconnect switch (015), thereby forming a power path for the second battery string charging and discharging electronic system to charge and discharge through the power grid;

[0024] At the same time, the power path for charging and discharging the first battery string charging and discharging electronic system is connected to the power path for charging and discharging the second battery string charging and discharging electronic system via an AC power line (014), forming a power path for mutual charging and discharging between the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system;

[0025] A battery string having n single storage batteries connected in series is provided with n+1 signal acquisition lines, ensuring that the positive pole and the negative pole of each storage battery single battery are connected to a battery parameter signal acquisition module by a signal acquisition line, that is, the first storage battery parameter signal acquisition module (10) is connected to the first single storage battery (101) of the first storage battery string, the second single storage battery (102) of the first storage battery string, and the nth single storage battery (10n) of the first storage battery string in sequence through the first signal acquisition line (111) of the first storage battery string, the second signal acquisition line (112) of the first storage battery string, the third signal acquisition line (113) of the first storage battery string, the nth signal acquisition line (11n) of the first storage battery string, and the n+1th signal acquisition line (11n+1) of the first storage battery string, respectively, to form an information link for the first storage battery parameter signal acquisition module (10) to collect information of each storage battery single battery of the first storage battery string;

[0026] At the same time, the second battery parameter signal acquisition module (20) is connected to the first single battery (201) of the second battery string, the second single battery (202) of the second battery string, and the nth single battery (20n) of the second battery string in sequence through the first signal acquisition line (211) of the second battery string, the second signal acquisition line (212) of the second battery string, the third signal acquisition line (213) of the second battery string, the nth signal acquisition line (21n) of the second battery string, and the n+1th signal acquisition line (21n+1) of the second battery string, respectively, to form an information link for the second battery parameter signal acquisition module (20) to collect information of each single battery of the second battery string;

[0027] The system control module (011) is respectively connected to the first battery parameter signal acquisition module (10), the first battery string positive pole DC protection and electric control switch (13), the first battery string negative pole DC protection and electric control switch (14), the first energy storage bidirectional inverter module (15), the first energy storage bidirectional inverter module AC output protection and electric control switch (16), the second battery parameter signal acquisition module (20), the second battery string positive pole DC protection and electric control switch (23), the second battery string negative pole DC protection and electric control switch (24), the second energy storage bidirectional inverter module (25), and the second energy storage bidirectional inverter module AC output protection and electric control switch (26) through the system control bus (012), forming a communication link for the system control module (011) to perform real-time monitoring on battery cells, process lithium battery group sorting information, and control system operation;

[0028] An operation control method of a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries is:

[0029] All lithium batteries are grouped in strings before use and are dynamically monitored for charging and discharging of two strings each time, and are sorted and grouped for processing. That is, in each of the two strings, the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system are used to exchange electric energy to perform energy-saving charging and discharging. At the same time, the voltage, current, quantity, temperature and corresponding information data of each battery cell are monitored and signal data collected. The system control module (011) monitors the information of each battery cell of the first battery string and the second battery string through the first battery parameter signal collection module (10) and the second battery parameter signal collection module (20). When the operating conditions are normal, the system control module (011) controls the operating modes of the first energy storage bidirectional inverter module (15) and the second energy storage bidirectional inverter module (25) respectively, wherein a voltage source V / F operating mode is used. , the other is a current source P / Q operation mode, the system control module (011) implements a charge and discharge process that meets the battery characteristics by adjusting the power of the energy storage bidirectional inverter module in the current source P / Q operation mode, and simultaneously monitors and records the voltage, current, power, temperature and corresponding change information data of each battery cell in real time, and completely performs at least one charge and discharge cycle, and the system control module (011) statistically analyzes the voltage, current, power, temperature and corresponding change information data of each battery cell collected in real time according to the corresponding processing method of the preset program, compares the dynamic monitoring and statistical analysis data of each single battery of the two battery strings, and performs grouping and sorting according to the consistency error range of the product standard and the application scenario requirements, so that the battery string grouping can meet and achieve the consistency error range requirements of the product standard and the application scenario requirements;

[0030] Since the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system perform energy-saving charging and discharging by exchanging electric energy, a small amount of electric energy loss will be generated, and electric power will be supplemented through the power grid (013). The system control module (011) controls the energy storage bidirectional inverter module in the voltage source V / F operation mode to control the corresponding battery string to standby when the power of the battery string reaches the protection value, so that the energy storage bidirectional inverter module in the current source P / Q operation mode and the corresponding battery string exchange electric energy with the power grid (013), completing the entire charging and discharging process.

[0031] like Figure 2 As shown, a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries, the system control module (011) mainly includes: an embedded controller (301), a data storage circuit (302), a clock circuit (303), a power supply circuit (304), a communication management circuit (305), an I / O management circuit (306), a control module bus (307), and a preset program module (308), wherein:

[0032] The embedded controller (301) is respectively connected to the data storage circuit (302), the clock circuit (303), the power circuit (304), the communication management circuit (305), the I / O management circuit (306), and the preset program module (308) through the control module bus (307), thereby forming a monitoring information link and a system module of the system control module (011).

[0033] A sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries, wherein the battery parameter signal acquisition module is characterized in that when the number of single cells in a battery string is greater than the maximum signal acquisition line of the battery parameter signal acquisition module minus 1, two or more battery parameter signal acquisition modules are used to jointly form an information link using each battery cell in the battery string, and the number of battery parameter signal acquisition modules is greater than the number of single cells in the battery string / an integer of the maximum signal acquisition line number of the battery parameter signal acquisition module minus 1.

[0034] The present invention discloses a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries. According to the fact that the charging and discharging of lithium-ion batteries in electrochemical energy storage is a dynamic process of electrochemical reaction, and actual application practice has proved that the dynamic operation of the energy storage system is a normal state, two battery string charging and discharging electronic systems are exchanged with electric energy to complete the energy-saving charging and discharging process, and the dynamic monitoring and statistical analysis data of each battery cell are compared. The battery string is assembled and sorted according to the battery product characteristic standard and the dynamic consistency error range allowed by the application scenario, so that the battery string assembly can meet and reach the product performance standard and the dynamic consistency error range requirement allowed by the application scenario. The conventional means of static detection and assembly and sorting based on the static detection in the prior art is broken through, and a new system of dynamic assembly and sorting is innovated, which reduces the inconsistency in the operation of the energy storage system, not only improves the resource utilization and use efficiency, but more importantly greatly reduces the damage of the battery cell and improves the inconsistency of the battery string, thereby improving the safety and efficiency of the operation of the energy storage system.

Claims

1. A sorting and assembly system based on the dynamic characteristics of double-string lithium batteries, mainly including: A system control module (011), a system control bus (012), a power grid (013), an AC power line (014), a power grid access disconnect switch (015), a first battery parameter signal acquisition module (10), a first battery string first single battery (101), a first battery string second single battery (102), a first battery string nth single battery (10n), a first battery string first signal acquisition line (111), a first battery string second signal acquisition line (112), a first battery string second signal acquisition line (113), a first battery string second signal acquisition line (114), a first battery string second signal acquisition line (115), a first battery string second signal acquisition line (116), a first battery string second signal acquisition line (117), a first battery string second signal acquisition line (118), a first battery string second signal acquisition line (119), a first battery string second signal acquisition line (120), a first battery string second signal acquisition line (121), a first battery string second signal acquisition line (122), a first battery string second signal acquisition line (123), a first battery string second signal acquisition line (124), a first battery string second signal acquisition line (125), a first battery string first signal acquisition line A collection line (112), a third signal collection line (113) of the first battery string, an nth signal collection line (11n) of the first battery string, an n+1th signal collection line (11n+1) of the first battery string, a positive connection terminal (11) of the first battery string, a negative connection terminal (12) of the first battery string, a positive DC protection and electric control switch (13) of the first battery string, a negative DC protection and electric control switch (14) of the first battery string, and a first energy storage bidirectional inverter module (15) , a first energy storage bidirectional inverter module AC output protection and electric control switch (16), a second battery parameter signal acquisition module (20), a first single battery (201) of a second battery string, a second single battery (202) of a second battery string, an nth single battery (20n) of a second battery string, a first signal acquisition line (211) of a second battery string, a second signal acquisition line (212) of a second battery string, a third signal acquisition line (213) of a second battery string, The nth signal acquisition line (21n) of the battery string, the n+1th signal acquisition line (21n+1) of the second battery string, the positive connection terminal (21) of the second battery string, the negative connection terminal (22) of the second battery string, the positive DC protection and electric control switch (23) of the second battery string, the negative DC protection and electric control switch (24) of the second battery string, the second energy storage bidirectional inverter module (25), and the AC output protection and electric control switch (26) of the second energy storage bidirectional inverter module, wherein: The first single storage battery (101) of the first storage battery string, the second single storage battery (102) of the first storage battery string, and the adjacent single storage battery positive and negative electrodes in the nth single storage battery (10n) of the first storage battery string are sequentially connected in series to form a first storage battery series string. The positive electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the first energy storage bidirectional inverter module (15) through the positive electrode connection terminal (11) of the first storage battery string and the positive electrode DC protection and electric control switch (13) of the first storage battery string. At the same time, the negative electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the first energy storage bidirectional inverter module (15). The first battery string negative electrode is connected to the negative electrode of the DC side of the first energy storage bidirectional inverter module (15) through the negative electrode connection terminal (12) of the first battery string and the negative electrode DC protection and electric control switch (14), and then the first energy storage bidirectional inverter module (15) is connected to the AC power line (014) through the first energy storage bidirectional inverter module AC output protection and electric control switch (16) and connected to the power grid (013) through the power grid access disconnect switch (015), thereby forming a power path for the first battery string charging and discharging electronic system to charge and discharge through the power grid; The first single storage battery (201) of the second storage battery string, the second single storage battery (202) of the second storage battery string, and the adjacent single storage battery positive and negative electrodes in the nth single storage battery (20n) of the second storage battery string are sequentially connected in series to form a second series storage battery string. The positive electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the second energy storage bidirectional inverter module (25) through the second storage battery string positive electrode connection terminal (21) and the second storage battery string positive electrode DC protection and electric control switch (23). At the same time, the negative electrode of the storage battery string is sequentially connected to the positive electrode of the DC side of the second energy storage bidirectional inverter module (25). The negative pole of the DC side of the second energy storage bidirectional inverter module (25) is connected to the negative pole of the second battery string through the negative pole connection terminal (22) of the second battery string and the negative pole DC protection and electric control switch (24), and then the second energy storage bidirectional inverter module (25) is connected to the AC power line (014) through the second energy storage bidirectional inverter module AC output protection and electric control switch (26) and connected to the power grid (013) through the power grid access disconnect switch (015), thereby forming a power path for the second battery string charging and discharging electronic system to charge and discharge through the power grid; At the same time, the power path for charging and discharging the first battery string charging and discharging electronic system is connected to the power path for charging and discharging the second battery string charging and discharging electronic system via an AC power line (014), forming a power path for mutual charging and discharging between the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system; A battery string having n single storage batteries connected in series is provided with n+1 signal acquisition lines, ensuring that the positive pole and the negative pole of each storage battery single battery are connected to a battery parameter signal acquisition module by a signal acquisition line, that is, the first storage battery parameter signal acquisition module (10) is connected to the first single storage battery (101) of the first storage battery string, the second single storage battery (102) of the first storage battery string, and the nth single storage battery (10n) of the first storage battery string in sequence through the first signal acquisition line (111) of the first storage battery string, the second signal acquisition line (112) of the first storage battery string, the third signal acquisition line (113) of the first storage battery string, the nth signal acquisition line (11n) of the first storage battery string, and the n+1th signal acquisition line (11n+1) of the first storage battery string, respectively, to form an information link for the first storage battery parameter signal acquisition module (10) to collect information of each storage battery single battery of the first storage battery string; At the same time, the second battery parameter signal acquisition module (20) is connected to the first single battery (201) of the second battery string, the second single battery (202) of the second battery string, and the nth single battery (20n) of the second battery string in sequence through the first signal acquisition line (211) of the second battery string, the second signal acquisition line (212) of the second battery string, the third signal acquisition line (213) of the second battery string, the nth signal acquisition line (21n) of the second battery string, and the n+1th signal acquisition line (21n+1) of the second battery string, respectively, to form an information link for the second battery parameter signal acquisition module (20) to collect information of each single battery of the second battery string; The system control module (011) is respectively connected to the first battery parameter signal acquisition module (10), the first battery string positive pole DC protection and electric control switch (13), the first battery string negative pole DC protection and electric control switch (14), the first energy storage bidirectional inverter module (15), the first energy storage bidirectional inverter module AC output protection and electric control switch (16), the second battery parameter signal acquisition module (20), the second battery string positive pole DC protection and electric control switch (23), the second battery string negative pole DC protection and electric control switch (24), the second energy storage bidirectional inverter module (25), and the second energy storage bidirectional inverter module AC output protection and electric control switch (26) through the system control bus (012), forming a communication link for the system control module (011) to perform real-time monitoring on battery cells, process lithium battery group sorting information, and control system operation; An operation control method of a sorting and assembly system based on the dynamic characteristics of double-string lithium batteries is: All lithium batteries are grouped in strings before use and are dynamically monitored for charging and discharging of two strings each time, and are sorted and grouped for processing. That is, in each of the two strings, the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system are used to exchange electric energy to perform energy-saving charging and discharging. At the same time, the voltage, current, quantity, temperature and corresponding information data of each battery cell are monitored and signal data collected. The system control module (011) monitors the information of each battery cell of the first battery string and the second battery string through the first battery parameter signal collection module (10) and the second battery parameter signal collection module (20). When the operating conditions are normal, the system control module (011) controls the operating modes of the first energy storage bidirectional inverter module (15) and the second energy storage bidirectional inverter module (25) respectively, wherein a voltage source V / F operating mode is used. , the other is a current source P / Q operation mode, the system control module (011) implements a charge and discharge process that meets the battery characteristics by adjusting the power of the energy storage bidirectional inverter module in the current source P / Q operation mode, and simultaneously monitors and records the voltage, current, power, temperature and corresponding change information data of each battery cell in real time, and completely performs at least one charge and discharge cycle, and the system control module (011) statistically analyzes the voltage, current, power, temperature and corresponding change information data of each battery cell collected in real time according to the corresponding processing method of the preset program, compares the dynamic monitoring and statistical analysis data of each single battery of the two battery strings, and performs grouping and sorting according to the consistency error range of the product standard and the application scenario requirements, so that the battery string grouping can meet and achieve the consistency error range requirements of the product standard and the application scenario requirements; Since the first battery string charging and discharging electronic system and the second battery string charging and discharging electronic system perform energy-saving charging and discharging by exchanging electric energy, a small amount of electric energy loss will be generated, and electric power will be supplemented through the power grid (013). The system control module (011) controls the energy storage bidirectional inverter module in the voltage source V / F operation mode to control the corresponding battery string to standby when the power of the battery string reaches the protection value, so that the energy storage bidirectional inverter module in the current source P / Q operation mode and the corresponding battery string exchange electric energy with the power grid (013), completing the entire charging and discharging process.

2. According to the system for sorting and assembling double-string lithium batteries based on dynamic characteristics of claim 1, the system control module (011) mainly comprises: An embedded controller (301), a data storage circuit (302), a clock circuit (303), a power supply circuit (304), a communication management circuit (305), an I / O management circuit (306), a control module bus (307), and a preset program module (308), wherein: The embedded controller (301) is respectively connected to the data storage circuit (302), the clock circuit (303), the power circuit (304), the communication management circuit (305), the I / O management circuit (306), and the preset program module (308) through the control module bus (307), thereby forming a monitoring information link and a system module of the system control module (011).

3. According to a sorting and assembly system based on the dynamic characteristics of dual-string lithium batteries as described in claim 1, the characteristic of the battery parameter signal acquisition module is that when the number of single cells in a battery string is greater than the maximum signal acquisition line of the battery parameter signal acquisition module minus 1, 2 or more battery parameter signal acquisition modules are used to jointly form an information link using each battery cell in the battery string, and the number of battery parameter signal acquisition modules is greater than the number of single cells in the battery string / an integer of the maximum signal acquisition line number of the battery parameter signal acquisition module minus 1.

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