Tandem formation and capacity grading detection system with polarity switching function

Abstract

The invention discloses a polarity-switchable serial formation and capacity grading detection system. The polarity-switchable serial formation and capacity grading detection system comprises a bidirectional conversion circuit, a polarity switching circuit and a battery switching circuit, the input end of the bidirectional conversion circuit is connected with a bus, and the bidirectional conversion circuit is used for rectifying alternating current transmitted by the bus into direct current. The polarity switching circuit is provided with two input ends and two output ends, and the two input ends of the polarity switching circuit are connected with the two output ends of the bidirectional conversion circuit. The two input ends of the battery switching circuit are connected with the two output ends of the polarity switching circuit, the battery switching circuit is used for connecting a plurality of batteries in series to form a series loop, and the battery switching circuit can connect any battery into the series loop and can quit any battery from the series loop. The polarity-switchable serial formation and capacity grading detection system provided by the invention can effectively solve the compatibility problem that the polarity of a whole disc of batteries is reverse in the battery type changing or disc assembling process, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery capacity detection, and in particular to a polarity-switchable series capacity detection system. Background Art

[0002] There are many processes in the production of lithium batteries. In the post-processing stage after liquid injection, formation and capacity separation are the key processes in battery production, which require testing equipment for charging and discharging. The formation process is used to activate the battery; the capacity separation process is used to sort the capacity and screen and grade the performance.

[0003] The technology of serial capacity division has the technical advantages of significantly improving the efficiency of power conversion, making the equipment current consistent, and shortening the operation and maintenance time. It has been widely used in the field of power and energy storage battery production. When lithium batteries are serially divided into capacities, a pallet is usually used as a carrier and transported to the press of the capacity division testing equipment through automated logistics. Through the action of the press mechanism, the positive and negative pole ears of the battery are correctly connected to the positive and negative pole probes docked with the needle bed, and then charged and discharged through the set formation process or capacity division process. In the production line, due to battery replacement or assembly, the polarity installation direction of the battery is opposite to the polarity direction of the original battery, that is, the positive and negative poles of the battery are reversed relative to the current probe, that is, the positive pole of the battery is connected to the original negative pole probe in the circuit, and the negative pole of the battery is connected to the original positive pole probe in the circuit, resulting in inability to work directly. Summary of the invention

[0004] In order to overcome the above technical defects, the present invention provides a polarity switchable series component capacity detection system. In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0005] The present invention provides a polarity-switchable series-connected capacity detection system for battery production. The series-connected capacity detection system comprises:

[0006] A bidirectional conversion circuit, wherein the input end of the bidirectional conversion circuit is connected to the bus, and when charging the battery, the bidirectional conversion circuit is used to convert the bus voltage into a charging voltage for charging the battery; when discharging the battery, the bidirectional conversion circuit is used to convert the direct current of the battery into the bus voltage;

[0007] A polarity switching circuit, wherein the polarity switching circuit 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;

[0008] A battery switch circuit, wherein two input ends of the battery switch circuit are connected to two output ends of the polarity switching circuit, and the battery switch circuit is used to connect multiple batteries in series to form a series circuit, and the battery switch circuit can connect any battery to the series circuit and can remove any battery from the series circuit;

[0009] Wherein, the polarity switching circuit has a first working state and a second working state;

[0010] In the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit for the batteries in the series circuit to be used for discharging the batteries;

[0011] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit for isolating the batteries with opposite polarities in the series circuit.

[0012] Preferably, the polarity switching circuit comprises:

[0013] A first bridge arm, the first bridge arm comprising an upper half bridge arm and a lower half bridge arm connected in series;

[0014] A second bridge arm, the second bridge arm comprising an upper half bridge arm and a lower half bridge arm connected in series, and the second bridge arm is connected in parallel with the first bridge arm;

[0015] Wherein, one output end of the bidirectional conversion circuit is connected to a connection point between an upper half bridge arm and a lower half bridge arm of the first bridge arm; another output end of the bidirectional conversion circuit is connected to a connection point between an upper half bridge arm and a lower half bridge arm of the second bridge arm;

[0016] One input end of the battery switch circuit is connected to the connection point between the upper half bridge arm of the first bridge arm and the upper half bridge arm 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 of the first bridge arm and the lower half bridge arm of the second bridge arm.

[0017] Preferably, the upper half bridge arm and the lower half bridge arm of the first bridge arm are both relays or controllable switch tubes;

[0018] Wherein, when the controllable switch tube includes 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;

[0019] The upper half bridge arm and the lower half bridge arm of the second bridge arm are both relays or controllable switch tubes;

[0020] Wherein, when the controllable switch tube includes 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 in the same direction.

[0021] Preferably, 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 turned off, so as to output a positive voltage to the battery switch circuit;

[0022] In the second working state, the lower half bridge arm of the first bridge arm and the upper half bridge arm of the second bridge arm are turned on, and the upper half bridge arm of the first bridge arm and the lower half bridge arm of the second bridge arm are turned off, so as to output a negative voltage to the battery switch circuit.

[0023] Preferably, the battery switch circuit comprises:

[0024] 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 direct switch and a bypass switch, one direct switch is connected in series with one battery, and the bypass switch is connected in parallel with the series direct switch and the battery;

[0025] Wherein, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding battery is connected to the series circuit;

[0026] When the direct switch of a switch control circuit is opened and the bypass switch is closed, the corresponding battery exits the series circuit.

[0027] Preferably, in the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit, and some batteries with opposite polarity to the positive voltage are disconnected from the corresponding direct circuit switch and closed from the corresponding bypass switch, so that the batteries with opposite polarity exit the series circuit;

[0028] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit, and some batteries with opposite polarity to the negative voltage exit the series circuit by disconnecting the corresponding direct circuit switches and closing the corresponding bypass switches.

[0029] Preferably, the serially connected capacity detection system comprises:

[0030] A control system, wherein the control system is connected to the polarity switching circuit and the battery switch circuit respectively;

[0031] Wherein, the battery switch circuit includes a detection module, and the detection module is used to detect the voltage and temperature of the battery;

[0032] The control system is used to control the polarity switching circuit to switch between a first working state and a second working state according to the battery voltage signal sent by the detection module.

[0033] Preferably, the serially connected capacity detection system comprises:

[0034] A monitoring center is connected to the control system and is used to monitor the operating status of the detection system.

[0035] Preferably, when the bus is AC, the bidirectional conversion circuit comprises:

[0036] AC-DC modules;

[0037] A DC-DC module is connected to the AC-DC module.

[0038] Preferably, when the bus is direct current, the bidirectional conversion circuit comprises:

[0039] A DC-DC module is connected between the bus and the polarity switching circuit.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention provides a polarity-switchable series-connected capacity detection system, comprising a bidirectional conversion circuit, a polarity switching circuit and a battery switch circuit. The input end of the bidirectional conversion circuit is connected to the bus. When charging the battery, the bidirectional conversion circuit is used to convert the bus voltage into a charging voltage for charging the battery; when discharging the battery, the bidirectional conversion circuit is used to convert the direct current of the battery into the bus voltage. The polarity switching circuit has two input ends and two output ends. The two input ends of the polarity switching circuit are connected to the two output ends of the bidirectional conversion circuit. The two input ends of the battery switch circuit are connected to the two output ends of the polarity switching circuit. The battery switch circuit is used to connect multiple batteries in series to form a series circuit. The battery switch circuit can connect any battery to the series circuit and can remove any battery from the series circuit.

[0042] Among them, the polarity switching circuit has a first working state and a second working state; in the first working state, the polarity switching circuit outputs a positive voltage to the battery switching circuit for splitting the batteries in the series circuit; in the second working state, the polarity switching circuit outputs a negative voltage to the battery switching circuit for splitting the batteries with opposite polarities in the series circuit.

[0043] The polarity-switchable serial capacity splitting detection system of the present invention is suitable for situations where the polarity of the entire tray or part of the batteries is opposite to the design due to battery replacement or battery assembly, and meets the needs of large-scale manufacturing on the production line. The docking mode of the battery and the needle bed is divided into positive polarity and negative polarity working modes. In the case of reverse connection of the battery, there is no need to readjust the direction of the battery, but the capacity splitting process will be completed according to the positive and negative polarities of the battery; the same set of equipment can split the positive and negative polarity batteries respectively, and there is no need to adjust the polarity when the battery polarity is reversed, saving time and equipment investment; the polarity-switchable serial capacity splitting detection system provided by the present invention can effectively solve the compatibility problem of the reverse polarity of the entire tray or part of the batteries during battery replacement or assembly, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0045] Figure 1 It is a schematic diagram of the structural connection of the detection system of the present invention;

[0046] Figure 2 It is a schematic diagram of the structural connection of the detection system of the present invention under the AC bus;

[0047] Figure 3 It is a schematic diagram of the structural connection of the detection system of the present invention under the DC bus;

[0048] Figure 4 and Figure 5 It is a schematic diagram of the electrical principle of the battery of the present invention under two different placement conditions;

[0049] Figure 6 and Figure 7 It is a circuit diagram of the specific implementation of the battery of the present invention under two different placement conditions. DETAILED DESCRIPTION

[0050] 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.

[0051] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no special meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0052] There are many processes in the production of lithium batteries. In the post-processing link after liquid injection, formation and capacity separation are the most critical processes in the battery post-processing link, and detection equipment is required for charging and discharging. The battery is activated through the formation process; the capacity is sorted and the performance is screened and graded through the capacity separation process. The traditional formation and capacity separation detection system uses a parallel technical solution, that is, each battery formation and capacity separation uses an independent charging and discharging power supply. This solution has been difficult to achieve significant improvements and breakthroughs in energy efficiency, accuracy and other performance.

[0053] The technology of serial connection and capacity division has the technical advantages of significantly improving the efficiency of power conversion, saving power cables, and reducing floor space, and has been widely used in the field of power and energy storage battery production. When lithium batteries are serially connected and divided, a pallet is usually used as a carrier, and it is transported to the press of the capacity division and testing equipment through automated logistics. Through the action of the press mechanism, the positive and negative pole ears of the battery are correctly connected to the positive and negative probes docked with the needle bed, and then charged and discharged through the set formation process or capacity division process. In the production line, due to battery replacement or assembly, the polarity installation direction of the battery is opposite to the polarity direction of the original battery, that is, the positive and negative poles of the battery are reversed relative to the current probe, that is, the positive pole of the battery is connected to the original negative pole probe in the circuit, and the negative pole of the battery is connected to the original positive pole probe in the circuit, resulting in inability to work directly. In order to ensure the adaptability of the production line, reduce the complexity and time of manually changing the direction of the positive and negative current probes of the circuit, a polarity switching circuit is designed to solve the compatibility problem of reverse polarity of the entire tray or part of the battery during battery replacement or assembly.

[0054] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0055] Reference Figure 1 The present invention provides a series-connected capacity detection system for battery production, including a bidirectional conversion circuit, a polarity switching circuit and a battery switch circuit. The input end of the bidirectional conversion circuit is connected to the bus. When charging the battery, the bidirectional conversion circuit is used to convert the bus voltage into a charging voltage for charging the battery; when discharging the battery, the bidirectional conversion circuit is used to convert the direct current of the battery into the bus voltage. The polarity switching circuit has two input ends and two output ends. The two input ends of the polarity switching circuit are connected to the two output ends of the bidirectional conversion circuit. The two input ends of the battery switch circuit are connected to the two output ends of the polarity switching circuit. The battery switch circuit is used to connect multiple batteries in series to form a series circuit. The battery switch circuit can connect any battery to the series circuit, and can remove any battery from the series circuit.

[0056] Among them, the polarity switching circuit has a first working state and a second working state; in the first working state, the polarity switching circuit outputs a positive voltage to the battery switching circuit for splitting the batteries in the series circuit; in the second working state, the polarity switching circuit outputs a negative voltage to the battery switching circuit for splitting the batteries with opposite polarities in the series circuit.

[0057] In the present invention, the bus includes an AC bus and a DC bus. When the bus is AC, the bidirectional rectifier circuit and the bidirectional conversion circuit include: an AC-DC module and a DC-DC module, and the DC-DC module is connected to the AC-DC module. When the bus is DC, the bidirectional conversion circuit includes: a DC-DC module, and the DC-DC module is connected between the bus and the polarity switching circuit.

[0058] In a specific implementation of the present invention, the polarity switching circuit includes:

[0059] 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;

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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;

[0064] 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.

[0065] Among them, Figure 2-Figure 4 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;

[0066] 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.

[0067] 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.

[0068] In a preferred implementation, the series-connected capacity detection system includes a control system, which is connected to the polarity switching circuit and the battery switch circuit respectively; wherein the battery switch circuit includes a detection module, and the detection module is used to detect the voltage and temperature of the 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 battery voltage signal sent by the detection module.

[0069] In a specific implementation, the detection module includes a voltage detection circuit, a temperature sensor, etc., which are conventional technical means in the art.

[0070] 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.

[0071] In a specific implementation, the bidirectional conversion circuit is used to connect an 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.

[0072] 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.

[0073] In a specific implementation, multiple switch control circuits are used to connect multiple batteries in series to form a series circuit; each of the switch control circuits includes a direct switch and a bypass switch, one direct switch is connected in series with one battery, and the bypass switch is connected in parallel with the series direct switch and the battery;

[0074] Wherein, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding battery is connected to the series circuit;

[0075] When the direct switch of a switch control circuit is opened and the bypass switch is closed, the corresponding battery exits the series circuit.

[0076] like Figure 2-Figure 4 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.

[0077] Among them, a bypass switch corresponds to an adjacent straight-circuit switch and a battery in parallel. When a battery corresponds to an adjacent straight-circuit switch closed and the corresponding bypass switch is disconnected, the battery is connected to the series circuit. When a battery corresponds to an adjacent straight-circuit switch disconnected and the corresponding bypass switch closed, the battery exits the series circuit.

[0078] 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 battery.

[0079] 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 battery from the series circuit.

[0080] In a specific implementation, in the first working state, the polarity switching circuit outputs a positive voltage to the battery switching circuit, and some 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 batteries with the same polarity as the positive voltage continue to work normally.

[0081] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit, and some 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 batteries with the same polarity as the negative voltage continue to work normally.

[0082] 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 battery is disconnected, and the corresponding bypass switch is closed, so that the 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, the occurrence of a fault, or the reaching of an alarm condition. After the bypass switch is closed, the battery to be tested for capacity will exit the series circuit.

[0083] 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.

[0084] 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 battery to be tested for capacity so as to connect the battery to be tested for capacity into a series circuit. It can be understood that the pressing device is used to contact the battery to form an electrical circuit so as to realize the connection between the above-mentioned functional circuits and the battery.

[0085] The present invention discloses a polarity-switching serial capacity detection system. When the serial capacity detection system is in operation, the control system controls the pressing device to contact the battery to be detected, and connects the battery to be detected into the series circuit. At the same time, the detection module in the battery series circuit detects the voltage of the 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.

[0086] In this way, no matter which end the positive electrode of the 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 battery to be tested for capacity, and the negative output end can be connected to the negative electrode of the battery to be tested for capacity, so that the polarity can be switched during actual use, which is suitable for occasions where the battery polarity is opposite to the design due to battery replacement or battery pack tray, and meets the needs of large-scale manufacturing on the production line.

[0087] The working principle of the polarity-switchable series-connected capacity detection system of the present invention is: the control system controls the probe or clamp of the pressing device to connect the electrode of the battery, the detection module detects the battery voltage and sends the detection result to the control system, the control system sends the control instruction to the polarity switching circuit, the polarity conversion cable controls different bridge arms to open and close according to the different polarities of the battery, and at the same time, all the direct switches are closed and the bypass switches are disconnected, the bidirectional conversion circuit charges and discharges the battery, when the voltage reaches the set voltage, or the time reaches the set time, the bypass switch is closed, the direct switch is disconnected, the battery exits the series main loop, and the control system controls the probe or clamp to separate from the battery electrode.

[0088] During the whole process, the set voltage or set time of the 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 battery, there is no need to re-reverse the direction of the battery. The equipment automatically determines the positive and negative polarity of the battery and completes the capacity division process, saving time and improving efficiency.

[0089] 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, battery series circuit, pressing device, etc.

[0090] In the specific implementation, refer to Figure 4 and Figure 5 , are two different ways of placing the battery. It can be seen that in different battery placement situations, by closing the corresponding switch, the positive electrode of the battery can always be connected to the positive terminal of the bidirectional conversion circuit, such as Figure 4 As shown, when the battery is pressed, the detection module detects the battery voltage of each channel. When all battery voltages are positive, the battery is 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 4 As shown, the positive electrode connection end of the bidirectional conversion circuit is connected to the positive electrode of the battery, and the batteries to be converted into capacities are BATn~BAT1. Each 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 batteries BATn~BAT1 by closing the straight-circuit switches Kn1~K11. Each 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 battery voltage reaches the cut-off condition, the 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 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.

[0091] like Figure 5 As shown in FIG. 1 , another arrangement of the batteries is shown. When the batteries are pressed together, the battery voltages of each channel are detected by the detection module. When all battery voltages are negative, the 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. Figure 5 As shown, the positive electrode connection end of the bidirectional conversion circuit is still connected to the positive electrode of the battery.

[0092] The polarity-switchable serial capacity-splitting detection system of the present invention is suitable for occasions where the battery polarity is opposite to the design due to battery replacement or battery assembly, and meets the needs of large-scale manufacturing of production lines. The docking mode of the battery and the needle bed is divided into positive polarity and negative polarity working modes. When the battery is pressed together, the internal detection module of the switch module detects whether the battery voltage 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 the battery, the design does not need to re-switch the battery direction, and the equipment automatically determines the positive and negative polarity of the battery and completes the capacity-splitting process; the same set of equipment can separately perform capacity-splitting on positive and negative polarity batteries, and there is no need to adjust the polarity when the battery polarity is reversed, saving time and equipment investment; the polarity-switchable serial capacity-splitting detection system provided by the present invention can effectively solve the compatibility problem of reverse polarity of the entire tray or part of the battery during battery replacement or assembly, and improve work efficiency.

[0093] For other structures of the polarity-switchable serial component capacity detection system described in this embodiment, refer to the prior art.

[0094] 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 polarity-switchable series-connected component capacity detection system for battery production, characterized in that: include: A bidirectional conversion circuit, wherein the input end of the bidirectional conversion circuit is connected to the bus, and when charging the battery, the bidirectional conversion circuit is used to convert the bus voltage into a charging voltage for charging the battery; when discharging the battery, the bidirectional conversion circuit is used to convert the direct current of the battery into the bus voltage; A polarity switching circuit, wherein the polarity switching circuit 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; A battery switch circuit, wherein two input ends of the battery switch circuit are connected to two output ends of the polarity switching circuit, and the battery switch circuit is used to connect multiple batteries in series to form a series circuit, and the battery switch circuit can connect any battery to the series circuit and can remove any battery from the series circuit; Wherein, the polarity switching circuit has a first working state and a second working state; In the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit for the batteries in the series circuit to be used for discharging the batteries; In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit for isolating the batteries with opposite polarities in the series circuit.

2. A polarity-switchable serial component capacity detection system according to claim 1, characterized in that: The polarity switching circuit comprises: A first bridge arm, the first bridge arm comprising an upper half bridge arm and a lower half bridge arm connected in series; A second bridge arm, the second bridge arm comprising an upper half bridge arm and a lower half bridge arm connected in series, and the second bridge arm is connected in parallel with the first bridge arm; Wherein, one output end of the bidirectional conversion circuit is connected to a connection point between an upper half bridge arm and a lower half bridge arm of the first bridge arm; another output end of the bidirectional conversion circuit is connected to a connection point between an upper half bridge arm and a lower half bridge arm of the second bridge arm; One input end of the battery switch circuit is connected to the connection point between the upper half bridge arm of the first bridge arm and the upper half bridge arm 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 of the first bridge arm and the lower half bridge arm of the second bridge arm.

3. A polarity-switchable serial component capacity detection system according to claim 2, characterized in that: 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 includes 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; 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 includes 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 in the same direction.

4. A polarity-switchable serial component capacity detection system according to claim 2 or 3, characterized in that: In a 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 turned off, so as to output a positive voltage to the battery switch circuit; In the second working state, the lower half bridge arm of the first bridge arm and the upper half bridge arm of the second bridge arm are turned on, and the upper half bridge arm of the first bridge arm and the lower half bridge arm of the second bridge arm are turned off, so as to output a negative voltage to the battery switch circuit.

5. The polarity-switchable serial component capacity detection 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 direct switch and a bypass switch, one direct switch is connected in series with one battery, and the bypass switch is connected in parallel with the series direct switch and the battery; Wherein, when the direct switch of a switch control circuit is closed and the bypass switch is opened, the corresponding 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 battery exits the series circuit.

6. A polarity-switchable serial component capacity detection system according to claim 5, characterized in that: In the first working state, the polarity switching circuit outputs a positive voltage to the battery switch circuit, and some batteries with opposite polarity to the positive voltage are disconnected from the series circuit by opening the corresponding direct circuit switch and closing the corresponding bypass switch; In the second working state, the polarity switching circuit outputs a negative voltage to the battery switch circuit, and some batteries with opposite polarity to the negative voltage exit the series circuit by disconnecting the corresponding direct circuit switches and closing the corresponding bypass switches.

7. The polarity-switchable serial component capacity detection system according to claim 1, characterized in that: include: A control system, wherein the control system is connected to the polarity switching circuit and the battery switch circuit respectively; Wherein, the battery switch circuit includes a detection module, and the detection module is used to detect the voltage and temperature of the battery; The control system is used to control the polarity switching circuit to switch between a first working state and a second working state according to the battery voltage signal sent by the detection module.

8. The polarity-switchable serial component capacity detection system according to claim 7, characterized in that: include: A monitoring center is connected to the control system and is used to monitor the operating status of the detection system.

9. The polarity-switchable serial component capacity detection system according to claim 1, characterized in that: When the bus is AC, the bidirectional conversion circuit includes: AC-DC modules; A DC-DC module is connected to the AC-DC module.

10. The polarity-switchable serial component capacity detection system according to claim 1, characterized in that: When the bus is direct current, the bidirectional conversion circuit includes: A DC-DC module is connected between the bus and the polarity switching circuit.

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