Cooperative control system for series formation and capacity grading of cylindrical batteries

Abstract

The invention discloses a cooperative control system for series formation and capacity grading of cylindrical batteries. The cooperative control system comprises a bidirectional conversion circuit, a plurality of battery switching circuits and a control system. The input end of the bidirectional conversion circuit is connected with the formation and capacity grading power supply, and when the cylindrical battery is charged, the bidirectional conversion circuit is used for converting the voltage of the formation and capacity grading power supply into the charging voltage for charging the cylindrical battery. When the cylindrical battery is discharged, the bidirectional conversion circuit is used for converting direct current of the cylindrical battery into formation and capacity grading power supply voltage; and the plurality of battery switch circuits are connected with the bidirectional conversion circuit. And the control system is used for controlling the bidirectional conversion circuit and the battery switch circuit to work. Wherein each battery switch circuit is used for connecting a plurality of cylindrical batteries in series so as to form a series loop for series formation and capacity grading; the battery switching circuit can connect any one cylindrical battery into the series loop and can quit any one cylindrical battery from the series loop.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical battery production, and in particular to a coordinated control system for connecting cylindrical batteries in series to form a capacity-enhancing system. Background Art

[0002] Large cylindrical batteries are favored by the market due to their excellent performance and cost advantages, attracting many companies to actively deploy. 18650 and 21700 cylindrical batteries are widely used. In recent years, large cylindrical batteries are becoming a new focus in the field of power batteries. With the rapid development of large cylindrical power batteries, the demand for efficient and reliable chemical composition and capacity detection equipment has also increased significantly.

[0003] Compared with the traditional parallel capacity-splitting technology, the series capacity-splitting technology is to connect multiple batteries in series and use the same set of charging and discharging power supply for production operations. The series capacity-splitting technology has significant advantages such as high charging and discharging efficiency, good battery consistency, and fast calibration and measurement. It has been widely used in square shell (including blade) and soft pack battery production lines and is an industry-leading technology.

[0004] However, since large cylindrical batteries are smaller in size than square shell batteries and soft pack batteries, the number of large cylindrical batteries in a single tray of split capacity on the automated production line of cylindrical batteries is greater. The number of batteries in a single tray is commonly 256, 324, 576, etc. This poses a huge challenge to the design of the split capacity system architecture. Summary of the invention

[0005] In order to overcome the above technical defects, the present invention provides a coordinated control system for connecting cylindrical batteries in series to generate different capacities.

[0006] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0007] The present invention provides a coordinated control system for cylindrical batteries connected in series to form a capacity-enhancing system, comprising:

[0008] A bidirectional conversion circuit, wherein the input end of the bidirectional conversion circuit is connected to a power supply for splitting the capacity. When charging the cylindrical battery, the bidirectional conversion circuit is used to convert the voltage of the power supply for splitting the capacity into a charging voltage for charging the cylindrical battery; when discharging the cylindrical battery, the bidirectional conversion circuit is used to convert the direct current of the cylindrical battery into the voltage of the power supply for splitting the capacity;

[0009] A plurality of battery switch circuits, wherein the plurality of battery switch circuits are connected to the bidirectional conversion circuit;

[0010] A control system, wherein the control system is connected to the bidirectional conversion circuit and the battery switch circuit respectively, and the control system is used to control the operation of the bidirectional conversion circuit and the plurality of battery switch circuits;

[0011] Each of the battery switch circuits is used to connect a plurality of cylindrical batteries in series to form a series circuit for series connection and capacity division; the battery switch circuit can connect any cylindrical battery to the series circuit and can remove any cylindrical battery from the series circuit.

[0012] Preferably, each battery switch circuit can connect 2 to 160 cylindrical batteries in series.

[0013] Preferably, the battery switch circuit comprises:

[0014] A plurality of switch control circuits, the plurality of switch control circuits are used to connect a plurality of batteries in series to form a series circuit; each of the switch control circuits comprises a straight-circuit switch and a bypass switch, a straight-circuit switch is connected in series with a cylindrical battery, and the bypass switch is connected in parallel with the straight-circuit switch and the cylindrical battery connected in series;

[0015] Among them, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding cylindrical battery is connected to the series circuit;

[0016] When the direct switch of a switch control circuit is opened and the bypass switch is closed, the corresponding cylindrical battery exits the series circuit.

[0017] Preferably, the battery switch circuit includes a plurality of detection modules, and one detection module is used to detect the voltage and temperature of 16 cylindrical batteries.

[0018] Preferably, the battery switch circuit comprises:

[0019] A voltage boosting unit, the voltage boosting unit is connected in the series circuit, and the voltage boosting unit is used to boost the voltage of the series circuit;

[0020] Wherein, the control system controls the voltage boosting unit according to the operating state of the battery switch circuit.

[0021] Preferably, the collaborative control system further includes:

[0022] A press control device, the press control device is connected to the control system; the press control device has at least one press;

[0023] The press has multiple sets of probes, and the press is used to place and connect cylindrical batteries through the probes; the probes of the press are connected to the battery switch circuit;

[0024] Wherein, the control system cooperatively controls the press control unit and the plurality of battery switch circuits.

[0025] Preferably, the collaborative control system further includes:

[0026] A control bus is used for the control system to connect the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device, so that the control system can coordinately control the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device.

[0027] Preferably, the bidirectional conversion circuit includes an AC module and a plurality of DC modules connected to the AC module, and one DC module is correspondingly connected to one battery switch circuit;

[0028] Among them, the collaborative control system also includes an AC / DC monitoring system, which is used to send the working status of the bidirectional conversion circuit to the control system in real time. The control system collaboratively controls the operation of multiple battery switch circuits according to the working status of the bidirectional conversion circuit.

[0029] Preferably, the collaborative control system further includes:

[0030] A monitoring center is connected to the control system and is used to monitor the operating status of the detection system.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention provides a coordinated control system for connecting cylindrical batteries in series to form a capacity split, comprising a bidirectional conversion circuit, a plurality of battery switch circuits and a control system. The input end of the bidirectional conversion circuit is connected to a capacity splitting power supply. When charging the cylindrical battery, the bidirectional conversion circuit is used to convert the voltage of the capacity splitting power supply into a charging voltage for charging the cylindrical battery. When discharging the cylindrical battery, the bidirectional conversion circuit is used to convert the direct current of the cylindrical battery into the capacity splitting power supply voltage; a plurality of the battery switch circuits are connected to the bidirectional conversion circuit. The control system is respectively connected to the bidirectional conversion circuit and the battery switch circuit, and the control system is used to control the operation of the bidirectional conversion circuit and the battery switch circuit. Each of the battery switch circuits is used to connect a plurality of cylindrical batteries in series to form a series circuit for connecting a plurality of cylindrical batteries in series to form a series circuit; the battery switch circuit can connect any cylindrical battery to the series circuit, and can remove any cylindrical battery from the series circuit.

[0033] The present invention adopts an innovative combination of bidirectional conversion circuit, multiple battery switch circuits and control system to meet the effective series connection and unified charging and discharging of a large number of large cylindrical batteries. The collaborative control system can manage a large number of cylindrical batteries that are connected in series and divided into capacities, and significantly improve the charging and discharging efficiency, which is suitable for the capacity division requirements of large-scale cylindrical battery production lines.

[0034] The present invention manages multiple battery switch circuits through the same control system to control two or more series circuits for multiple cylindrical batteries to be connected in series to form a capacity. The same control system is used to achieve high-precision control of multiple currents and voltages, ensuring that each cylindrical battery maintains consistency throughout the entire charging and discharging process, and immediately exits when any cylindrical battery meets the cut-off condition without affecting the normal operation of other cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 This is a schematic diagram of the structure framework of the collaborative control system of the present invention. Figure 1 ;

[0037] Figure 2 This is a schematic diagram of the structure framework of the collaborative control system of the present invention. Figure 2 ;

[0038] Figure 3 It is a schematic diagram of the local structural connection of the cooperative control system of the present invention;

[0039] Figure 4 It is a structural connection diagram of a single battery switch circuit of the present invention under an AC bus;

[0040] Figure 5 It is a schematic diagram of the structural connection of a single battery switch circuit of the present invention under a DC bus;

[0041] Figure 6 and Figure 7 It is a schematic diagram of the electrical principle of the cylindrical battery of the present invention under two different placement conditions;

[0042] Figure 8 and Fig. 9 It is a circuit diagram of the specific implementation of the cylindrical battery of the present invention under two different placement conditions. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] Compared with the traditional parallel capacity-splitting technology, the series capacity-splitting technology is to connect multiple batteries in series and use the same set of charging and discharging power supply for production operations. The series capacity-splitting technology has significant advantages such as high charging and discharging efficiency, good battery consistency, and fast calibration and measurement. It has been widely used in square shell (including blade) and soft pack battery production lines and is an industry-leading technology.

[0045] However, because large cylindrical batteries are smaller in size than square shell batteries and soft pack batteries, the number of large cylindrical batteries corresponding to the same size of the split capacity equipment has increased sharply. When performing series split capacity, conventional technology is difficult to meet the effective series connection and unified charging and discharging of a large number of large cylindrical batteries, which brings great challenges to the design of the split capacity system architecture. Therefore, there is an urgent need for a new control system that can overcome the technical difficulties of series split capacity of cylindrical batteries and achieve more efficient battery management.

[0046] To this end, the present invention adopts an innovative combination of bidirectional conversion circuits, multiple battery switch circuits and control systems to meet the effective series connection and unified charging and discharging of a large number of large cylindrical batteries. The collaborative control system can manage a large number of cylindrical batteries that are connected in series and split into capacities, and significantly improve the charging and discharging efficiency, which is suitable for the splitting capacity requirements of large-scale cylindrical battery packs.

[0047] Embodiment 1

[0048] like Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a coordinated control system for cylindrical batteries connected in series to form a capacity-splitting circuit, including a bidirectional conversion circuit, a plurality of battery switch circuits and a control system. The input end of the bidirectional conversion circuit is connected to a capacity-splitting power supply. When charging the cylindrical battery, the bidirectional conversion circuit is used to convert the voltage of the capacity-splitting power supply into a charging voltage for charging the cylindrical battery. When discharging the cylindrical battery, the bidirectional conversion circuit is used to convert the direct current of the cylindrical battery into the capacity-splitting power supply voltage; a plurality of the battery switch circuits are connected to the bidirectional conversion circuit. The control system is respectively connected to the bidirectional conversion circuit and the battery switch circuit, and the control system is used to control the operation of the bidirectional conversion circuit and the battery switch circuit. Each of the battery switch circuits is used to connect a plurality of cylindrical batteries in series to form a series circuit for series-connecting and forming a capacity-splitting circuit; the battery switch circuit can connect any cylindrical battery to the series circuit, and can remove any cylindrical battery from the series circuit.

[0049] The present invention manages multiple battery switch circuits through the same control system to control two or more series circuits for multiple cylindrical batteries to be connected in series to form a capacity. The same control system is used to achieve high-precision control of multiple currents and voltages, ensuring that each cylindrical battery maintains consistency throughout the entire charging and discharging process, and immediately exits when any cylindrical battery meets the cut-off condition without affecting the normal operation of other cylindrical batteries.

[0050] In a preferred implementation, each battery switch circuit can connect 2 to 160 cylindrical batteries in series. This technology can achieve the capacity division of up to 160 cylindrical batteries in series, can manage a large number of series-connected batteries, significantly improve the charging and discharging efficiency, and is suitable for the capacity division needs of large-scale battery packs.

[0051] Each series circuit in the architecture can support up to 160 batteries, and multiple series circuits can achieve coordinated control. The system adopts a modular design, with a series control and sampling module (lower computer) for every 16 channels. All modules work closely with the middle computer to ensure that the charging and discharging process of the entire battery pack is stable and efficient.

[0052] It is understandable that the coordinated control technology of multiple series circuits can manage two or more series circuits through the same control system to ensure the accuracy and consistency of the cylindrical battery pack during the capacity division operation. The cylindrical batteries in each series circuit are charged and discharged in strict accordance with the same process flow, and the system can ensure the synchronous execution of all steps, so that the cylindrical batteries in the entire capacity division production line maintain consistent performance.

[0053] In a specific implementation, the battery switch circuit includes:

[0054] A plurality of switch control circuits, the plurality of switch control circuits are used to connect a plurality of batteries in series to form a series circuit; each of the switch control circuits comprises a straight-circuit switch and a bypass switch, a straight-circuit switch is connected in series with a cylindrical battery, and the bypass switch is connected in parallel with the straight-circuit switch and the cylindrical battery connected in series;

[0055] Among them, when the direct switch of a switch control circuit is closed and the bypass switch is disconnected, the corresponding cylindrical battery is connected to the series circuit; when the direct switch of a switch control circuit is disconnected and the bypass switch is closed, the corresponding cylindrical battery exits the series circuit.

[0056] In a specific implementation, the battery switch circuit includes a plurality of detection modules, and one detection module is used to detect the voltage and temperature of 16 cylindrical batteries.

[0057] like Figure 1 As shown, the battery switch circuit includes a voltage boosting unit, which is connected to the series circuit and is used to boost the voltage of the series circuit. The control system controls the voltage boosting unit according to the operating state of the battery switch circuit.

[0058] It is understandable that the control system will decide whether to adjust the operation of the voltage boosting unit according to the operating status of the circuit, such as turning the boosting unit on or off, to adapt to different working conditions.

[0059] Furthermore, the collaborative control system also includes a press control device, which is connected to the control system; the press control device has at least one press. The press has multiple sets of probes, and the press is used to place and connect cylindrical batteries through the probes; the probes of the press are connected to the battery switch circuit. The control system collaboratively controls the press control unit and the multiple battery switch circuits.

[0060] In the art, a press is a piece of equipment used to load batteries and contact the batteries through probes.

[0061] Preferably, the collaborative control system also includes a control bus, which is used for the control system to connect the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device, so that the control system can collaboratively control the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device.

[0062] Through the control bus, the control system is able to control multiple different circuits and devices at the same time to achieve more efficient and coordinated operations.

[0063] In a specific implementation, the bidirectional conversion circuit includes an AC module and a plurality of DC modules connected to the AC module, and one DC module is correspondingly connected to one battery switch circuit;

[0064] Among them, the collaborative control system also includes an AC / DC monitoring system, which is used to send the working status of the bidirectional conversion circuit to the control system in real time. The control system collaboratively controls the operation of multiple battery switch circuits according to the working status of the bidirectional conversion circuit.

[0065] The collaborative control principle adopted by the present invention is: the system monitors the various working values ​​of the battery in real time through the sampling module, and compares them with the preset cut-off conditions. When a battery in a branch meets the preset cut-off condition, the series branch to which the battery belongs is controlled through the high-speed communication architecture to immediately exit the charging and discharging process without affecting other branches or other batteries in the same branch, ensuring that the battery is charged and discharged strictly according to the set process. Through the collaborative control of multiple loops, the system can maintain efficient operation under different process conditions, improve production efficiency, and reduce production energy consumption.

[0066] In the present invention, the capacity-splitting power supply includes an AC power grid, a power distribution cabinet and a bus bar connected to each other, and the bus bar is connected to a bidirectional conversion circuit.

[0067] In a specific implementation, the bus includes an AC bus and a DC bus. When the bus is AC power, the bidirectional conversion circuit includes: an AC-DC module and multiple DC-DC modules, the DC-DC module is connected to the AC-DC module, and one DC-DC module is connected to a battery switch circuit. When the bus is DC power, the bidirectional conversion circuit includes: multiple DC-DC modules, and one DC-DC module is directly connected to a battery switch circuit. The bidirectional conversion circuit supports a high-voltage bus voltage range of 600V to 800V, thereby adapting to different application requirements.

[0068] Embodiment 2

[0069] The second embodiment provides a cooperative control system, and its system architecture and working principle are completely the same as those of the first embodiment. The second embodiment is based on the first embodiment and provides a cooperative control system including a plurality of polarity switching circuits.

[0070] In a preferred embodiment, the present invention further includes a plurality of polarity switching circuits, each of which has two input terminals and two output terminals, and the two input terminals of the polarity switching circuit are connected to the two output terminals of the bidirectional conversion circuit.

[0071] Wherein, two output ends of one of the polarity switching circuits are correspondingly connected to an input end of one of the battery switch circuits; the polarity switching circuit has a first working state and a second working state;

[0072] In the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit for the cylindrical batteries in the series circuit to be used for discharging into different capacities;

[0073] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit for use in the cylindrical batteries with opposite polarities in the series circuit to separate the capacities.

[0074] The polarity switching circuit of the present invention is used to make the collaborative control system suitable for occasions where the polarity of the entire tray or part of the cylindrical batteries caused by the cylindrical battery replacement or cylindrical battery assembly is opposite to the design, and adapts to the needs of large-scale manufacturing on the production line. The docking mode of the cylindrical battery and the needle bed is divided into positive polarity and negative polarity working modes. In the case of reverse connection of the cylindrical battery, there is no need to re-switch the direction of the cylindrical battery, but the capacity conversion process will be completed according to the positive and negative polarities of the cylindrical battery. It can be understood that the present invention can be used to convert positive and negative polarity cylindrical batteries into capacity respectively under the same set of equipment. When the polarity of the cylindrical battery is reversed, there is no need to adjust the polarity, which saves time and equipment investment. It can effectively solve the compatibility problem of the reverse polarity of the entire tray or part of the cylindrical battery during the cylindrical battery replacement or assembly process, and improve work efficiency.

[0075] In a specific implementation of the present invention, the polarity switching circuit includes:

[0076] A first bridge arm, the first bridge arm comprising an upper half bridge arm K1 and a lower half bridge arm K3 connected in series;

[0077] The second bridge arm comprises an upper bridge arm K2 and a lower bridge arm K4 connected in series, and the second bridge arm is connected in parallel with the first bridge arm.

[0078] In a preferred implementation, the upper half bridge arm and the lower half bridge arm of the first bridge arm are both relays or controllable switch tubes; wherein, when the controllable switch tube contains a diode, the upper half bridge arm and the lower half bridge arm of the first bridge arm are connected in series in the same direction, and the diodes of the upper half bridge arm and the lower half bridge arm of the first bridge arm are in the same direction.

[0079] In a preferred embodiment, the upper half bridge arm and the lower half bridge arm of the second bridge arm are both relays or controllable switch tubes. Wherein, when the controllable switch tube contains a diode, the upper half bridge arm and the lower half bridge arm of the second bridge arm are connected in series in the same direction, and the diodes of the upper half bridge arm and the lower half bridge arm of the second bridge arm are connected in the same direction.

[0080] Specifically, the first bridge arm and the second bridge arm are both controllable switch tubes with anti-parallel diodes, and the upper bridge arm K1 and the lower bridge arm K3 of the first bridge arm are connected in series in the same direction;

[0081] The upper bridge arm K2 and the lower bridge arm K4 of the second bridge arm are both controllable switch tubes with anti-parallel diodes, and the upper bridge arm K2 and the lower bridge arm K4 of the second bridge arm are connected in series in the same direction.

[0082] Among them, Figure 4-Figure 6 As shown, one output end of the bidirectional conversion circuit is connected to a connection point between the upper half bridge arm K1 and the lower half bridge arm K3 of the first bridge arm; the other output end of the bidirectional conversion circuit is connected to a connection point between the upper half bridge arm K2 and the lower half bridge arm K4 of the second bridge arm;

[0083] One input end of the battery switch circuit is connected to the connection point between the upper half bridge arm K1 of the first bridge arm and the upper half bridge arm K2 of the second bridge arm; the other input end of the battery switch circuit is connected to the connection point between the lower half bridge arm K3 of the first bridge arm and the lower half bridge arm K3 of the second bridge arm.

[0084] Regarding the use principle of the polarity switching circuit of the present invention, in the first working state, the upper half of the first bridge arm and the lower half of the second bridge arm are turned on, and the lower half of the first bridge arm and the upper half of the second bridge arm are disconnected, so as to output a positive voltage to the battery switch circuit. In the second working state, the lower half of the first bridge arm and the upper half of the second bridge arm are turned on, and the upper half of the first bridge arm and the lower half of the second bridge arm are disconnected, so as to output a negative voltage to the battery switch circuit.

[0085] In a preferred implementation, the control system of the present invention is connected to a plurality of polarity switching circuits and a plurality of battery switch circuits respectively.

[0086] Furthermore, the battery switch circuit includes a plurality of detection modules, and the detection modules are used to detect the voltage and temperature of the cylindrical battery. The control system is used to control the polarity switching circuit to switch between the first working state and the second working state according to the cylindrical battery voltage signal sent by the detection module.

[0087] In a specific implementation, the detection module includes a voltage detection circuit, a temperature sensor, etc., which are conventional technical means in the art. One detection module is used to detect the voltage and temperature of 16 cylindrical batteries.

[0088] Specifically, the control system is used to control the polarity switching circuit, specifically, by instructing the upper half bridge arm K1 and the lower half bridge arm K3 of the first bridge arm to be turned on / closed, and instructing the upper half bridge arm K2 and the lower half bridge arm K4 of the second bridge arm to be turned on / closed.

[0089] In a specific implementation, the bidirectional conversion circuit is used to connect the AC bus, and the bidirectional conversion circuit includes an AC-DC module and a DC-DC module, and the DC-DC module is connected to the AC-DC module. Specifically, the DC-DC module is correspondingly connected to a polarity switching circuit, and the polarity switching circuit is connected to the battery switch circuit.

[0090] In this field, when the bus connected to the bidirectional conversion circuit is three-phase alternating current, the function of the AC-DC module is to convert alternating current (AC) into direct current (DC), and it also plays the role of overcurrent protection and overvoltage protection; the main function of the DC-DC module is to convert one DC voltage into another DC voltage; the DC-DC module increases or decreases the input DC voltage to the required output voltage level, which enables the equipment to adapt to different power requirements or load requirements, providing a flexible, stable and reliable power supply solution for the detection system, and meeting the application requirements of different voltage requirements.

[0091] In a specific implementation, multiple switch control circuits are used to connect multiple cylindrical batteries in series to form a series circuit; each of the switch control circuits includes a straight-circuit switch and a bypass switch, one straight-circuit switch is connected in series with one cylindrical battery, and the bypass switch is connected in parallel with the straight-circuit switch and the cylindrical battery in series;

[0092] Among them, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding cylindrical battery is connected to the series circuit;

[0093] When the direct switch of a switch control circuit is opened and the bypass switch is closed, the corresponding cylindrical battery exits the series circuit.

[0094] like Figure 4-Figure 7 As shown, the battery switch circuit of the present invention includes a plurality of direct switches Kn1-K11 and a plurality of bypass switches Kn2-K12.

[0095] Among them, a bypass switch corresponds to an adjacent straight-circuit switch and a cylindrical battery in parallel. When a cylindrical battery corresponds to an adjacent straight-circuit switch closed and the corresponding bypass switch is disconnected, the cylindrical battery is connected to the series circuit. When a cylindrical battery corresponds to an adjacent straight-circuit switch disconnected and the corresponding bypass switch closed, the cylindrical battery exits the series circuit.

[0096] In a specific implementation, the direct switch and the bypass switch can use relays, electronic switches, etc. to achieve the connection and exit of the cylindrical battery.

[0097] The control system is connected to the battery switch circuit, and the control system controls the direct switch and the bypass switch of the battery switch circuit to realize the connection and exit of the cylindrical battery from the series circuit.

[0098] In a specific implementation, in the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit, and some cylindrical batteries with opposite polarity to the positive voltage exit the series circuit by disconnecting the corresponding direct circuit switch and closing the corresponding bypass switch; some cylindrical batteries with the same polarity as the positive voltage continue to work normally.

[0099] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit, and some cylindrical batteries with opposite polarity to the negative voltage exit the series circuit by disconnecting the corresponding direct circuit switch and closing the corresponding bypass switch; some cylindrical batteries with the same polarity as the negative voltage continue to work normally.

[0100] In a specific implementation, the control system is provided with a cut-off condition. When the cut-off condition is reached, the direct switch corresponding to a cylindrical battery is disconnected, and the corresponding bypass switch is closed, so that the cylindrical battery exits the series circuit. The cut-off condition includes but is not limited to the voltage reaching the set voltage, the time reaching the set time, a fault occurring, or reaching the alarm condition. After closing the bypass switch, the cylindrical battery to be subjected to the capacity test exits the series circuit.

[0101] In the specific implementation, the detection system also includes a monitoring center, which is connected to the control system and is used to monitor the operating status of the detection system. When a fault occurs during the operation of the detection system, an alarm will be issued in time.

[0102] In a specific implementation of the present invention, the detection system also includes a pressing device, which includes a probe or a clamp, which is connected to the control system through a cable, and the control system probe or clamp is connected to the cylindrical battery to be tested for capacity so as to connect the cylindrical battery to be tested for capacity into a series circuit. It can be understood that the pressing device is used to contact the cylindrical battery to form an electrical circuit so as to realize the connection between the above-mentioned functional circuits and the cylindrical battery.

[0103] A collaborative control system of the present invention, when the collaborative control system is running, the control system controls the pressing device to contact the cylindrical battery to be chemically converted and tested for capacity, and connects the cylindrical battery to be chemically converted and tested for capacity into a series circuit. At the same time, the detection module in the cylindrical battery series circuit detects the voltage of the cylindrical battery and sends the detection result to the control system. The control system controls the bridge arm action of the polarity switching circuit according to the detection result.

[0104] In this way, no matter which end the positive electrode of the cylindrical battery to be tested for capacity is at, the positive output end of the bidirectional conversion circuit can be connected to the positive electrode of the cylindrical battery to be tested for capacity, and the negative output end can be connected to the negative electrode of the cylindrical battery to be tested for capacity, so that the polarity can be switched during actual use, which is suitable for occasions where the polarity of the cylindrical battery is opposite to the design due to the replacement of the cylindrical battery or the cylindrical battery pack, and meets the needs of large-scale manufacturing on the production line.

[0105] The working principle of a collaborative control system of the present invention is: the control system controls the probe or clamp of the pressing device to connect the electrode of the cylindrical battery, the detection module detects the voltage of the cylindrical battery and sends the detection result to the control system, the control system sends the control instruction to the polarity switching circuit, and the polarity conversion cable controls different bridge arms to open and close according to the different polarities of the cylindrical battery. At the same time, all direct switches are closed and bypass switches are disconnected, and the bidirectional conversion circuit charges and discharges the cylindrical battery. When the voltage reaches the set voltage or the time reaches the set time, the bypass switch is closed and the direct switch is disconnected, the cylindrical battery exits the series main circuit, and the control system controls the probe or clamp to separate from the electrode of the cylindrical battery.

[0106] During the whole process, the set voltage or set time of the cylindrical battery voltage is set by the control system, which controls the whole process. At the same time, the monitoring unit monitors to ensure the normal operation of the system. In the case of reverse connection of the cylindrical battery, there is no need to re-reverse the direction of the cylindrical battery. The equipment automatically determines the positive and negative polarity of the cylindrical battery and completes the capacity division process, saving time and improving efficiency.

[0107] The control system can realize the functional regulation of the entire detection system. The functions of the control system include but are not limited to system control and information collection, information interaction with the monitoring center, and interactive control and command sending with the bidirectional conversion circuit, cylindrical battery series circuit, pressing device, etc.

[0108] In the specific implementation, refer to Figure 6 and Figure 7 , are two different ways of placing cylindrical batteries. It can be seen that in different placements of cylindrical batteries, by closing the corresponding switch, the positive electrode of the cylindrical battery can always be connected to the positive terminal of the bidirectional conversion circuit, such as Figure 6 As shown, when the cylindrical batteries are pressed together, the detection module detects the voltage of the cylindrical batteries in each channel. When the voltage of all cylindrical batteries is positive, the cylindrical batteries are positive polarity. At this time, the control system controls the polarity switching module to close the first switch K1 and the fourth switch K4, and the current flows as shown in FIG. Figure 6 As shown, the positive electrode connection end of the bidirectional conversion circuit is connected to the positive electrode of the cylindrical battery, the cylindrical batteries to be converted into capacity are BATn~BAT1, each cylindrical battery BATn~BAT1 is connected in series with a straight-circuit switch Kn1~K11, the positive electrode of the bidirectional conversion circuit charges and discharges the cylindrical batteries of BATn~BAT1 by closing the straight-circuit switches Kn1~K11, each cylindrical battery and the straight-circuit switch are connected in parallel with a bypass switch, the function of the bypass switches Kn2~K12 is that when the voltage of the cylindrical battery reaches the cut-off condition, the cylindrical battery will exit the series main circuit, that is, disconnect the main circuit switches Kn1~K11 and close Kn2~K12; the same is true when the cylindrical battery discharge reaches the cut-off condition, the cut-off condition includes but is not limited to the voltage reaching the set voltage, or the time reaching the set time, or reaching a fault or alarm condition.

[0109] like Fig. 9 As shown in FIG. 1 , another arrangement of cylindrical batteries is shown. When the cylindrical batteries are pressed together, the voltage of the cylindrical batteries in each channel is detected by the detection module. When the voltage of all cylindrical batteries is negative, the cylindrical batteries are of negative polarity. At this time, the control system controls the polarity switching module to close the second switch K2 and the third switch K3, and the current flows as shown in FIG. Fig. 9 As shown, the positive electrode connection end of the bidirectional conversion circuit is still connected to the positive electrode of the cylindrical battery.

[0110] A collaborative control system of the present invention is suitable for occasions where the polarity of cylindrical batteries is opposite to the design due to the change of cylindrical battery type or cylindrical battery assembly, and meets the needs of large-scale manufacturing of production lines. The docking mode of cylindrical batteries and needle beds is divided into positive polarity and negative polarity working modes. When the cylindrical batteries are pressed together, the internal detection module of the switch module detects whether the voltage of the cylindrical battery is positive or negative. After the detection is completed, the detection result is sent to the control system, and the control system sends the control logic of the switch to the switch module and the polarity switching module. The switch control block and the polarity switching module open or close the switch. Compared with the prior art, in the case of reverse connection of cylindrical batteries, the design does not need to re-switch the direction of the cylindrical battery. The equipment automatically determines the positive and negative polarity of the cylindrical battery and completes the capacity separation process; the same set of equipment can separate the positive and negative polarity cylindrical batteries, and there is no need to adjust the polarity when the polarity of the cylindrical battery is reversed, which saves time and equipment investment; the collaborative control system provided by the present invention can effectively solve the compatibility problem of reverse polarity of the entire tray or part of the cylindrical battery during the change of cylindrical battery type or assembly, and improve work efficiency.

[0111] The core of this system architecture is the control system of the central computer. Each circuit module collects the information of a single battery in real time, including voltage, temperature, etc. The control system communicates through the field bus, so that the central computer can collect the voltage, current, temperature and other data of each battery in the series battery pack in real time, ensuring accurate constant current and constant voltage control of each battery under any working conditions, and coordinating the charging and discharging operations of multiple battery series branches. The central computer also has the function of detecting abnormal conditions such as overvoltage, overcurrent, and overheating, and can respond quickly when necessary to protect the safety of the battery and the system.

[0112] On the other hand, the present invention adopts a modular design to make the system highly scalable. According to different application requirements, the scale and configuration of the system can be flexibly adjusted by adding or reducing the corresponding battery switch circuits, etc. This system is particularly suitable for the chemical composition and capacity process of large-scale cylindrical batteries. In practical applications, the system can be flexibly configured according to the scale and characteristics of the battery pack to meet various complex charging and discharging requirements. In addition, the modular design of the system also supports future technology updates, such as adding new power modules or optimizing control algorithms to further improve system performance.

[0113] For other structures of the collaborative control system for serially connecting cylindrical batteries into capacity components described in this embodiment, refer to the prior art.

[0114] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A coordinated control system for cylindrical batteries connected in series to form a capacity, characterized in that: include: A bidirectional conversion circuit, wherein the input end of the bidirectional conversion circuit is connected to a power supply for splitting the capacity. When charging the cylindrical battery, the bidirectional conversion circuit is used to convert the voltage of the power supply for splitting the capacity into a charging voltage for charging the cylindrical battery; when discharging the cylindrical battery, the bidirectional conversion circuit is used to convert the direct current of the cylindrical battery into the voltage of the power supply for splitting the capacity; A plurality of battery switch circuits, wherein the plurality of battery switch circuits are connected to the bidirectional conversion circuit; A control system, wherein the control system is connected to the bidirectional conversion circuit and the battery switch circuit respectively, and the control system is used to control the operation of the bidirectional conversion circuit and the plurality of battery switch circuits; Each of the battery switch circuits is used to connect a plurality of cylindrical batteries in series to form a series circuit for series connection and capacity division; the battery switch circuit can connect any cylindrical battery to the series circuit and can remove any cylindrical battery from the series circuit.

2. A coordinated control system for cylindrical batteries connected in series to form a capacity distribution system according to claim 1, characterized in that: Each battery switch circuit can connect 2 to 160 cylindrical batteries in series.

3. A coordinated control system for cylindrical batteries connected in series to form a capacity distribution system according to claim 1, characterized in that: The battery switch circuit comprises: A plurality of switch control circuits, the plurality of switch control circuits are used to connect a plurality of batteries in series to form a series circuit; each of the switch control circuits comprises a straight-circuit switch and a bypass switch, a straight-circuit switch is connected in series with a cylindrical battery, and the bypass switch is connected in parallel with the straight-circuit switch and the cylindrical battery connected in series; Among them, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding cylindrical battery is connected to the series circuit; When the direct switch of a switch control circuit is opened and the bypass switch is closed, the corresponding cylindrical battery exits the series circuit.

4. A coordinated control system for serially connecting cylindrical batteries to separate capacities according to claim 3, characterized in that: The battery switch circuit includes a plurality of detection modules, one of which is used to detect the voltage and temperature of 16 cylindrical batteries.

5. A coordinated control system for serially connecting cylindrical batteries to separate capacities according to claim 4, characterized in that: The battery switch circuit comprises: A voltage boosting unit, the voltage boosting unit is connected in the series circuit, and the voltage boosting unit is used to boost the voltage of the series circuit; Wherein, the control system controls the voltage boosting unit according to the operating state of the battery switch circuit.

6. A coordinated control system for serially connecting cylindrical batteries to separate capacities according to claim 5, characterized in that: The collaborative control system further includes: A press control device, the press control device is connected to the control system; the press control device has at least one press; The press has multiple sets of probes, and the press is used to place and connect cylindrical batteries through the probes; the probes of the press are connected to the battery switch circuit; Wherein, the control system cooperatively controls the press control unit and the plurality of battery switch circuits.

7. A coordinated control system for serially connecting cylindrical batteries to separate capacities according to claim 6, characterized in that: The collaborative control system further includes: A control bus is used for the control system to connect the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device, so that the control system can coordinately control the bidirectional conversion circuit, multiple battery switching circuits, the voltage boosting unit of the battery switching circuit and the press control device.

8. A coordinated control system for cylindrical batteries connected in series to separate capacities according to claim 7, characterized in that: The bidirectional conversion circuit includes an AC module and a plurality of DC modules connected to the AC module, and one DC module is correspondingly connected to one battery switch circuit; Among them, the collaborative control system also includes an AC / DC monitoring system, which is used to send the working status of the bidirectional conversion circuit to the control system in real time. The control system collaboratively controls the operation of multiple battery switch circuits according to the working status of the bidirectional conversion circuit.

9. A coordinated control system for cylindrical batteries connected in series to separate capacities according to claim 1, characterized in that: Also includes: A monitoring center is connected to the control system and is used to monitor the operating status of the detection system.

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