A polarity-switching series component capacity detection system

Abstract

The present invention discloses a polarity-switching series-connected capacity detection system, comprising a bidirectional conversion circuit, a polarity switching circuit, and a battery switching circuit. The input end of the bidirectional conversion circuit is connected to a busbar, and the bidirectional conversion circuit is used to rectify the alternating current transmitted by the busbar into direct current. The polarity switching circuit has two input ends and two output ends, and 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 switching circuit are connected to the two output ends of the polarity switching circuit, and the battery switching circuit is used to connect multiple batteries in series to form a series circuit. The battery switching circuit can connect any battery to the series circuit and can remove any battery from the series circuit. The polarity-switching series-connected capacity detection system provided by the present invention can effectively solve the compatibility problem of reverse polarity of batteries in a whole tray during battery replacement or tray assembly, thereby improving work efficiency.

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] Lithium battery production involves numerous steps. Among the post-processing steps after filling, formation and capacity separation are key processes in battery production, requiring testing equipment for charging and discharging. The formation process activates the battery, while the capacity separation process allows for capacity sorting and performance screening and grading.

[0003] The technology of serial capacity division has the technical advantages of significantly improving the efficiency of power conversion, making the current of equipment 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, pallets are usually used as carriers 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 poles of the battery are correctly connected to the positive and negative probes docked on 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 probe in the circuit, and the negative pole of the battery is connected to the original positive probe in the circuit, resulting in direct operation. Summary of the Invention

[0004] In order to overcome the above technical defects, the present invention provides a polarity-switchable series-connected 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 includes:

[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 switching circuit, wherein the two input terminals of the battery switching circuit are connected to the two output terminals of the polarity switching circuit, the battery switching circuit being used to connect multiple batteries in series to form a series circuit, and the battery switching circuit being capable of connecting any battery into the series circuit and removing 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 switching circuit for discharging the batteries in the series circuit into different capacities;

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

[0012] Preferably, the polarity switching circuit includes:

[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, the second bridge arm being connected in parallel with the first bridge arm;

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

[0016] One input end of the battery switching 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 switching 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 switching 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, thereby outputting a negative voltage to the battery switching circuit.

[0023] Preferably, the battery switch circuit includes:

[0024] Multiple switch control circuits, each of which is 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, wherein each direct switch is connected in series with each battery, and the bypass switch is connected in parallel with the series direct switch and battery;

[0025] Among them, 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 series circuit by opening the corresponding direct circuit switch and closing the corresponding bypass switch;

[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 are disconnected from the series circuit by opening the corresponding direct switches and closing the corresponding bypass switches.

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

[0030] a control system, the control system being 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 includes:

[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 busbar is AC power, the bidirectional conversion circuit includes:

[0036] AC-DC modules;

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

[0038] Preferably, when the busbar is direct current, the bidirectional conversion circuit includes:

[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 switching 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 switching circuit are connected to the two output ends of the polarity switching circuit. The battery switching circuit is used to connect multiple batteries in series to form a series circuit. The battery switching 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 polarity 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 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 will be further described in detail below with reference to 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 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 a 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 with reference to 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 following description, suffixes such as "module," "component," or "unit" used to represent elements are used only to facilitate the description of the present invention and have no specific meaning. Therefore, "module," "component," or "unit" may be used interchangeably.

[0052] Lithium battery production involves numerous steps. Among the post-processing steps after filling, formation and capacity grading are the most critical, requiring testing equipment to monitor charging and discharging. The formation process activates the battery, while the capacity grading process performs capacity sorting and performance screening and grading. Traditional formation and capacity grading testing systems utilize a parallel technology solution, meaning each battery formation and capacity grading step utilizes an independent charging and discharging power supply. This solution has struggled to achieve significant improvements in performance, such as energy efficiency and accuracy.

[0053] Series cell-to-cell technology offers significant advantages, including significantly improved power conversion efficiency, reduced power cable consumption, and reduced floor space. It has been widely used in power and energy storage battery production. During series cell-to-cell processing, lithium batteries are typically transported via automated logistics to a press on a cell-to-cell testing machine. The press mechanism then correctly connects the battery's positive and negative tabs to the positive and negative probes on a needle bed. Charging and discharging are then performed according to the designated formation or cell-to-cell process. During production, due to battery type changes or assembly, the battery's polarity may be reversed relative to the original production battery. This can cause the battery's positive and negative poles to be connected to the current probes, with the positive pole connecting to the previously negative probe in the circuit and the negative pole to the previously positive probe in the circuit, resulting in direct failure. To ensure adaptability during production line changes and reduce the complexity and time required to manually change the positive and negative current probes, a polarity switching circuit is designed to address compatibility issues caused by reversed polarity on entire or partial cell trays during battery type changes or assembly.

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

[0055] Reference Figure 1 The present invention provides a series connection capacity detection system for battery production, comprising a bidirectional conversion circuit, a polarity switching circuit and a battery switching 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 switching circuit are connected to the two output ends of the polarity switching circuit. The battery switching circuit is used to connect multiple batteries in series to form a series circuit. The battery switching 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 busbar includes an AC busbar and a DC busbar. When the busbar is AC, the bidirectional rectifier circuit and bidirectional conversion circuit include an AC-DC module and a DC-DC module, with the DC-DC module connected to the AC-DC module. When the busbar is DC, the bidirectional conversion circuit includes a DC-DC module, which is connected between the busbar 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 includes an upper half bridge arm K2 and a lower half bridge arm K4 connected in series, and the second bridge arm is connected in parallel with the first bridge arm.

[0061] In a preferred embodiment, 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 half bridge arm K1 and the lower half 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, such as Figure 2-Figure 4 As shown, one output end of the bidirectional conversion circuit is connected to the 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 the 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 switching 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 switching 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 operating principle of the polarity switching circuit of the present invention, in a first operating state, the upper half of the first bridge arm and the lower half of the second bridge arm are conductive, while the lower half of the first bridge arm and the upper half of the second bridge arm are disconnected, thereby outputting a positive voltage to the battery switching circuit. In a second operating state, the lower half of the first bridge arm and the upper half of the second bridge arm are conductive, while the upper half of the first bridge arm and the lower half of the second bridge arm are disconnected, thereby outputting a negative voltage to the battery switching circuit.

[0068] In a preferred embodiment, the series-connected capacity detection system includes a control system connected to the polarity switching circuit and the battery switching circuit, respectively. The battery switching circuit includes a detection module configured to detect battery voltage and temperature. The control system is configured to control the polarity switching circuit to switch between a first operating state and a second operating state based on a battery voltage signal transmitted 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 this field.

[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 to 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 AC, the function of the AC-DC module is to convert AC into DC, while also providing overcurrent protection and overvoltage protection. The main function of the DC-DC module is to convert one DC voltage into another. 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 battery;

[0074] Among them, 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] A bypass switch is connected in parallel to an adjacent in-line switch and a battery. When the in-line switch corresponding to a battery is closed and the corresponding bypass switch is open, the battery is connected to the series circuit. When the in-line switch corresponding to a battery is open and the corresponding bypass switch is closed, the battery is removed from the series circuit.

[0078] In a specific implementation, the direct switch and the bypass switch can adopt relays, electronic switches, etc. to realize 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 into 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. Some batteries with opposite polarity to the positive voltage are disconnected from the series circuit by opening the corresponding direct switch and closing the corresponding bypass switch; some batteries with the same polarity as the positive voltage continue to operate normally.

[0081] In the second working state, the polarity switching circuit outputs a negative voltage to the battery switching circuit. Some batteries with opposite polarity to the negative voltage are disconnected from the series circuit by opening the corresponding direct switch and closing the corresponding bypass switch; some batteries with the same polarity as the negative voltage continue to operate normally.

[0082] In one specific implementation, the control system is configured with a cutoff condition. When the cutoff condition is met, the direct-line switch corresponding to a battery is opened and the corresponding bypass switch is closed, causing the battery to exit the series circuit. Cutoff conditions include, but are not limited to, voltage reaching a set voltage, time reaching a set time, a fault occurring, or an alarm condition being met. When the bypass switch is closed, the battery to be tested for capacity is removed from the series circuit.

[0083] In a 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 a timely manner.

[0084] In a specific implementation of the present invention, the detection system also includes a pressing device, which includes a probe or a clamp, and the probe or the clamp is connected to the control system through a cable. The control system probe or the 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 to realize the connection between the above-mentioned functional circuits and the battery.

[0085] The present invention discloses a polarity-switchable series capacity detection system. When the series capacity detection system is in operation, a control system controls a pressing device to contact a battery to be tested for capacity, connecting the battery to be tested for capacity into a series circuit. Simultaneously, a 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 action of a bridge arm of a polarity switching circuit based on the detection result.

[0086] In this way, no matter which end the positive pole 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 pole of the battery to be tested for capacity, and the negative output end can be connected to the negative pole of the battery to be tested for capacity. Polarity switching can be achieved during actual use, which is suitable for situations 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 capacity detection system of the present invention is as follows: the control system controls the probe or clamp of the pressing device to connect to 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 direct switches are closed and the bypass switches are disconnected, and 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 and 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 entire process, the battery voltage setting voltage or setting time is set by the control system, which controls the entire 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 battery direction. 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 under different battery placement conditions, 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 terminal of the bidirectional conversion circuit is connected to the positive terminal of the battery. The batteries to be converted into fractional capacity are BATn-BAT1. Each battery BATn-BAT1 is connected in series with a direct-circuit switch Kn1-K11. The positive terminal of the bidirectional conversion circuit charges and discharges the batteries BATn-BAT1 by closing the direct-circuit switches Kn1-K11. Each battery and the direct-circuit switch are connected in parallel with a bypass switch. The function of the bypass switches Kn2-K12 is to remove the battery from the series main circuit when the battery voltage reaches the cut-off condition, that is, to open the main circuit switches Kn1-K11 and close Kn2-K12. The same applies when the battery discharge reaches the cut-off condition. The cut-off conditions include but are not limited to the voltage reaching a set voltage, the time reaching a set time, or the reaching of a fault or alarm condition.

[0091] like Figure 5 As shown in the figure, another arrangement of the batteries is shown. When the batteries are pressed together, the detection module detects the battery voltage of each channel. When all battery voltages are negative, the battery is 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 the figure. Figure 5 As shown, the positive terminal of the bidirectional conversion circuit is still connected to the positive terminal of the battery.

[0092] The polarity-switchable serial capacity detection system of the present invention is suitable for situations where the battery polarity is opposite to the design due to battery replacement or battery assembly, and is adapted to the needs of large-scale production on the production line. 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. 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 existing technology, this design does not need to re-switch the battery direction in the case of reverse connection of the battery. The equipment automatically determines the positive and negative polarity of the battery and completes the capacity-switch process. The same set of equipment can separately perform capacity-switch on positive and negative polarity batteries. When the battery polarity is reversed, there is no need to adjust the polarity, which saves time and equipment investment. The polarity-switchable serial capacity 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 merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of 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 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 switching circuit, wherein the two input terminals of the battery switching circuit are connected to the two output terminals of the polarity switching circuit, the battery switching circuit being used to connect multiple batteries in series to form a series circuit, and the battery switching circuit being capable of connecting any battery into the series circuit and removing 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 switching circuit for discharging the batteries in the series circuit into different capacities; In the second working state, the polarity switching circuit outputs a negative voltage to the battery switching circuit for isolating the batteries with opposite polarities in the series circuit.

2. The 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, the second bridge arm being connected in parallel with the first bridge arm; Wherein, one output end of the bidirectional conversion circuit is connected to the connection point between the upper half bridge arm and the lower half bridge arm of the first bridge arm; the other output end of the bidirectional conversion circuit is connected to the connection point between the upper half bridge arm and the lower half bridge arm of the second bridge arm; One input end of the battery switching 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 switching 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. The 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, thereby outputting a negative voltage to the battery switching circuit.

5. The polarity-switchable serial component capacity detection system according to claim 1, characterized in that: The battery switch circuit includes: Multiple switch control circuits, each of which is 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, wherein each direct switch is connected in series with each battery, and the bypass switch is connected in parallel with the series direct switch and battery; Among them, 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. The 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 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 are disconnected from the series circuit by opening the corresponding direct 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, the control system being 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 busbar 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 busbar 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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