Charging device and charging system

Abstract

The application relates to the new energy technology field and discloses a charging device and a charging system. The charging device comprises a main charging machine, a slave charging machine and a line assembly. The main charging machine is used for electrically connecting a battery module. The slave charging machine is used for forming a series loop or a parallel loop with the main charging machine to charge the battery module. The line assembly is electrically connected with the main charging machine and the slave charging machine. The main charging machine interacts with the slave charging machine based on the line assembly to detect the line state of the slave charging machine. In one aspect, the series loop or the parallel loop is built by at least two charging machines, the demand of high charging voltage or large charging power is met, and the problem of low charging efficiency of the prior art is improved. In another aspect, the line state of the slave charging machine can be detected, the problem of poor wiring is checked in advance, the safety accidents are avoided, and the problem that the poor wiring is found in the charging process and the charging efficiency is reduced is avoided.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, specifically to a charging device and charging system. Background Technology

[0002] Existing power batteries have a relatively wide charging voltage range, fluctuating between 10V for hybrid vehicles and 100V for some pure electric vehicles. The charger provides this charging voltage to the power battery. However, the maximum output voltage and power of existing chargers are limited. The maximum output voltage of existing chargers does not exceed 100V, and the power does not exceed 3kW. These chargers have relatively low charging efficiency and cannot meet the needs of fast charging scenarios. Summary of the Invention

[0003] One objective of this invention is to provide a charging device and charging system that improves the problem of low charging efficiency in the prior art.

[0004] In a first aspect, embodiments of the present invention provide a charging device, comprising:

[0005] The main charger is used for electrical connection to the battery module;

[0006] The slave charger is used to form a series or parallel circuit with the main charger to charge the battery module;

[0007] The circuit assembly is electrically connected to both the master charger and the slave charger, wherein the master charger interacts with the slave charger based on the circuit assembly to detect the circuit status of the slave charger.

[0008] Optionally, the master charger responds to the mode command, enters the line detection mode corresponding to the series circuit or the parallel circuit, and interacts with the slave charger based on the line components in the line detection mode.

[0009] Optionally, the circuit assembly includes:

[0010] A communication line is electrically connected to the main charger and the slave charger respectively, and the main charger interacts with the slave charger based on the communication line;

[0011] A common line is electrically connected to both the main charger and the slave charger. The slave charger detects the line status based on the reference signal transmitted through the common line.

[0012] Optionally, the master charger broadcasts a detection command based on the communication line, and each slave charger responds to the detection command by performing a line detection operation of the target circuit to detect the line status according to the reference signal transmitted on the common line, wherein the target circuit includes a series circuit or a parallel circuit.

[0013] Optionally, if the target circuit is a series circuit, the reference signal is a series reference signal, the detection command includes a series detection command, the slave charger with the address to be determined responds to the series detection command, and detects the line status between the slave charger with the address to be determined and its connected charger according to the series reference signal, and the address of the master charger on the series circuit is given by default.

[0014] Optionally, if the line status is normal, the slave charger with the pending address determines the address based on the address identifier carried by the serial detection command.

[0015] Optionally, if the line status is normal, the slave charger with the most recently determined address broadcasts a successful connection information based on the communication line, and the master charger detects whether the slave charger with the most recently determined address has reconnected to the battery module based on the successful connection information.

[0016] Optionally, the series reference signal is: a reference signal applied to the common line by the charger whose address is most recently determined in response to the series detection command, relative to the slave charger whose current address is yet to be determined.

[0017] Optionally, each charger includes a positive terminal and a negative terminal;

[0018] The voltage amplitude of the series reference signal is the first voltage difference between the common line and the first terminal. The slave charger with the address to be determined detects the line status between itself and the charger connected to it based on the second voltage difference between the common line and the second terminal and the first voltage difference.

[0019] Optionally, if the second pressure difference is equal to the first pressure difference, the line is in a normal state; if the second pressure difference is not equal to the first pressure difference, the line is in an abnormal state.

[0020] Optionally, if the target circuit is a parallel circuit, the reference signal is a first parallel reference signal, the detection command includes a first parallel detection command, the master charger applies the first parallel reference signal to the common line, and each slave charger responds to the first parallel detection command and, when it determines that the third voltage difference of the common line relative to the first electrode matches the first parallel reference signal, broadcasts a first parallel connection success message based on the communication line.

[0021] Optionally, the detection command includes a second parallel detection command, wherein the master charger applies a second parallel reference signal to the common line, and each slave charger responds to the second parallel detection command and, when it determines that the fourth voltage difference of the common line relative to the second electrode matches the second parallel reference signal, broadcasts a second parallel success message based on the communication line.

[0022] Optionally, the main charger determines the number of slave chargers whose line status is normal based on the first parallel connection success information and the second parallel connection success information.

[0023] In a second aspect, embodiments of the present invention provide a charging system, comprising:

[0024] The aforementioned charging device;

[0025] The battery module is electrically connected to both the main charger and the slave charger.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects: In the charging device provided in the embodiments of the present invention, the main charger is used to electrically connect to the battery module, and the slave charger is used to form a series circuit or a parallel circuit with the main charger to charge the battery module. The circuit components are electrically connected to the main charger and the slave charger respectively. The main charger interacts with the slave charger based on the circuit components to detect the circuit status of the slave charger. On the one hand, this embodiment builds a series circuit or a parallel circuit by using at least two chargers to meet the requirements of high charging voltage or high charging power, which is beneficial to improving the problem of low charging efficiency in the prior art. On the other hand, this embodiment can detect the circuit status of the slave charger, identify wiring problems in advance, and avoid safety accidents and the problem of reduced charging efficiency caused by discovering wiring problems only during the charging process. Attached Figure Description

[0027] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0028] Figure 1 This is a schematic diagram of the structure of a charger provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a charger according to another embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of a charging device provided in an embodiment of the present invention;

[0031] Figure 4This is a schematic diagram of the structure of a charging device provided in another embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of a charging device provided in another embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a charging device provided in another embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of a charging device provided in another embodiment of the present invention;

[0035] Figure 8 A schematic diagram of a first scenario in which three chargers form a series circuit to provide power to a battery module, as provided in an embodiment of the present invention;

[0036] Figure 9 A schematic diagram of a second scenario provided by an embodiment of the present invention, in which three chargers form a series circuit to provide power to a battery module;

[0037] Figure 10 This is a schematic diagram illustrating a scenario where three chargers form a parallel circuit to provide power to a battery module, as provided in an embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of a charging system provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0040] It should be noted that, unless otherwise specified, the various features in the embodiments of this invention can be combined with each other, all of which are within the protection scope of this invention. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. Moreover, the terms "first," "second," and "third" used in this invention do not limit the data or execution order, but only distinguish identical or similar items with essentially the same function and effect.

[0041] This invention provides a charger. Please refer to [link / reference]. Figure 1Each charger 100 includes a main control circuit 10, a power supply circuit 11, a first voltage sampling circuit 12, a second voltage sampling circuit 13, a current sampling circuit 14, a temperature sampling circuit 15, a start-up circuit 16, a low-voltage power supply circuit 17, a communication interface circuit 18, a selector 19, and a third voltage sampling circuit 110. The main control circuit 10 serves as the control core of the charger 100 and is used to process various control logics of the charger 100. The main control circuit 10 can be a microcontroller, a single-chip microcomputer, or other microprocessor.

[0042] The power supply circuit 11 is electrically connected to the main control circuit 10 and is used to provide power to the battery module. Under the control of the main control circuit 10, the power supply circuit 11 can generate a corresponding output voltage or output power. Therefore, the power supply circuit 11 is controlled by the main control circuit 10 and can adjust the output voltage or output power of the charger 100.

[0043] In some embodiments, the power supply circuit 11 may be an AC-DC conversion circuit or a DC-DC conversion circuit. It is understood that the power supply circuits 11 of each charger 100 may form a series circuit or a parallel circuit.

[0044] The first voltage sampling circuit 12 is electrically connected to both the power supply circuit 11 and the main control circuit 10. It samples the output voltage of the power supply circuit 11 and transmits it to the main control circuit 10. The main control circuit 10 then controls the operating state of the power supply circuit 11 based on the output voltage. For example, when the main control circuit 10 detects that the output voltage is greater than a preset voltage threshold, it controls the power supply circuit 11 to stop operating. When the main control circuit 10 detects that the output voltage is less than a target voltage, it controls the output voltage of the power supply circuit 11 to reach the target voltage.

[0045] The second voltage sampling circuit 13 is electrically connected to the battery module and the main control circuit 10 respectively. It is used to sample the charging voltage of the battery module and transmit the charging voltage to the main control circuit 10. The main control circuit 10 controls the working state of the power supply circuit 11 according to the charging voltage, so that the voltage output by the charger 100 to the battery module can meet the battery charging strategy.

[0046] A current sampling circuit 14 is installed in the power supply circuit of the power supply circuit 11. The current sampling circuit 14 is electrically connected to the main control circuit 10 and is used to sample the output current in the power supply circuit and transmit the output voltage to the main control circuit 10. The main control circuit 10 controls the operating state of the power supply circuit 11 based on the output current. For example, when the main control circuit 10 detects that the output current is greater than a preset current threshold, the main control circuit 10 controls the power supply circuit 11 to stop working. When the main control circuit 10 detects that the output current is less than the target current, the main control circuit 10 controls the output current of the power supply circuit 11 to reach the target current.

[0047] It is understandable that the current sampling circuit 14 can be selected as a sampling circuit with any circuit structure, such as a Hall sensor or a current sampling circuit composed of a resistor or a resistor and a capacitor.

[0048] A temperature sampling circuit 15 is installed inside the charger 100. The temperature sampling circuit 15 is electrically connected to the main control circuit 10 and is used to sample the operating temperature of the charger 100 and transmit the operating temperature to the main control circuit 10. The main control circuit 10 then performs corresponding operations based on the operating temperature. For example, when the main control circuit 10 detects that the operating temperature is greater than a preset temperature threshold, the main control circuit 10 controls the power supply circuit 11 to stop working and / or generates a prompt message to alert the user that the charger is in an overheated state.

[0049] The start-up circuit 16 is electrically connected to the main control circuit 10 and is used to respond to start / stop commands by sending start / stop signals to the main control circuit 10. The main control circuit 10 then controls the operating state of the charger 100 according to these signals. For example, when the start-up circuit 16 sends a start signal to the main control circuit 10, the main control circuit 10 starts the charger 100. When the start-up circuit 16 sends a stop signal to the main control circuit 10, the main control circuit 10 stops the charger 100 from operating.

[0050] It is understandable that the start circuit 16 can be a start / stop button set on the charger 100, or it can be a level generating circuit or a communication module.

[0051] In some embodiments, the start-up circuit 16 is a level generating circuit. When the start-up circuit 16 receives a start command, it generates a high-level signal to instruct the charger 100 to operate. When the start-up circuit 16 receives a stop command, it generates a low-level signal to instruct the charger 100 to stop operating.

[0052] The difference from the above embodiments is that, in some embodiments, the startup circuit 16 is a communication module. When the startup circuit 16 receives a startup command, it forwards the startup command to the main control circuit 10. The startup command is used to instruct the charger 100 to start working. When the startup circuit 16 receives a stop command, it forwards a stop command. The stop command is used to instruct the charger 100 to stop working.

[0053] It is understandable that start / stop commands can be sent by external terminals, such as remote controls or mobile phones. In some embodiments, start / stop commands can also be sent by other chargers according to control logic; for example, the main charger can send start / stop commands to the slave charger.

[0054] The low-voltage power supply circuit 17 is electrically connected to the main control circuit 10. When the charger 100 is electrically connected to the battery module, the low-voltage power supply circuit 17 can provide low-voltage power to the battery management chip of the battery module, such as providing 12V low-voltage power.

[0055] The communication interface circuit 18 is electrically connected to the main control circuit 10 and is used to communicate with the battery module or other chargers. The communication interface circuit 18 supports any suitable communication protocol. For example, the communication interface circuit 18 supports the CAN communication protocol. The communication interface circuit 18 of the charger 100 communicates with the communication interface circuits of other chargers based on the CAN bus. Similarly, the communication interface circuit 18 of the charger 100 also communicates with the battery module based on the CAN bus.

[0056] Selector 19 is electrically connected to power supply circuit 11 and main control circuit 10 respectively, and is used to switch the transmission path of reference signal under the control of main control circuit 10. The reference signal is used to detect the line status of the charger.

[0057] In some embodiments, the selector 19 is configured with a first transmission path and a second transmission path. Under the control of the main control circuit 10, the selector 19 selects the corresponding transmission path between the first transmission path and the second transmission path as the target transmission path to transmit the reference signal.

[0058] In some embodiments, the main control circuit 10 sends a first level signal to the selector 19, and the selector 19 selects a first transmission path as the target transmission path based on the first level signal. The main control circuit 10 sends a second level signal to the selector 19, and the selector 19 selects a second transmission path as the target transmission path based on the second level signal. The first level signal and the second level signal are different. When the first level signal is high, the second level signal is low. When the first level signal is low, the second level signal is high.

[0059] When the first transmission path is the target transmission path, the main control circuit 10 can control the power supply circuit 10 to transmit a reference signal of a specified voltage value through the first transmission path with the positive terminal of the power supply circuit as ground. When the second transmission path is the target transmission path, the main control circuit 10 can control the power supply circuit 10 to transmit a reference signal of a specified voltage value through the second transmission path with the negative terminal of the power supply circuit as ground.

[0060] In some embodiments, in order to detect the line status of the charger, a common line 111 may be provided, wherein the common line 111 is electrically connected to the output terminal of the selector 19 of each charger. When the selector 19 selects to output the corresponding reference signal, the reference signal can be applied to the common line 111 and transmitted to each charger 100.

[0061] In some embodiments, please refer to Figure 2 The selector 19 is a single-pole double-throw electronic switch. The selector 19 includes a first stationary terminal 191, a second stationary terminal 192, and a moving terminal 193. The first stationary terminal 191 is electrically connected to the positive terminal of the power supply circuit 11, and the second stationary terminal 192 is electrically connected to the negative terminal of the power supply circuit 41.

[0062] When the moving end 493 is electrically connected to the first stationary end 491, the selector 49 selects the first transmission path as the target transmission path. When the moving end 493 is electrically connected to the second stationary end 492, the selector 49 selects the second transmission path as the target transmission path.

[0063] The third voltage sampling circuit 110 is located at the output of the selector 19 and is used to sample the reference signal. The third voltage sampling circuit 110 is also electrically connected to the main control circuit 10 and transmits the sampled reference signal to the main control circuit 10. The main control circuit 10 controls the power supply circuit 11 according to the reference signal and the specified voltage value.

[0064] In some embodiments, when the main control circuit 10 controls the selector 19 to select the first transmission path as the target transmission path, and the main control circuit 10 detects that the reference signal sampled by the third voltage sampling circuit 110 has not reached the specified voltage value, the main control circuit 10 controls the power supply circuit 11 to output the reference signal that has reached the specified voltage value through the first transmission path with the negative terminal as ground.

[0065] In some embodiments, when the main control circuit 10 controls the selector 19 to select the second transmission path as the target transmission path, and the main control circuit 10 detects that the reference signal sampled by the third voltage sampling circuit 110 has not reached the specified voltage value, the main control circuit 10 controls the power supply circuit 11 to output the reference signal that has reached the specified voltage value through the second transmission path with the positive terminal as ground.

[0066] It is understood that each charger can be configured to enter a corresponding working mode according to a role setting command. In some embodiments, the role setting command is a master role setting command, and the charger enters the master charger working mode according to the master role setting command; that is, the charger is configured as a master charger. In some embodiments, the role setting command is a slave role setting command, and the charger enters the slave charger working mode according to the slave role setting command; that is, the charger is configured as a slave charger.

[0067] It is also understandable that the character setting commands can be set locally by the user by operating the function keys on the charger, or they can be sent remotely by the user through the host computer.

[0068] This invention provides a charging device; please refer to [link / reference]. Figure 3The charging device 300 includes a main charger 31, a slave charger 32, and a line assembly 33.

[0069] The main charger 31 is used to electrically connect to the battery module 34, and the slave charger 32 is used to form a series circuit or a parallel circuit with the main charger 31 to charge the battery module 34.

[0070] It is understandable that the number of chargers is one (e.g., 32). Figure 3 As shown, a series circuit is formed between the charger 32 and the main charger 31 to charge the battery module 34.

[0071] In some embodiments, the number of chargers 32 is two or more, see [link to relevant documentation]. Figure 4 Each slave charger 32 and the main charger 31 form a series circuit to charge the battery module 34.

[0072] In some embodiments, the number of chargers 32 is one; see [link to relevant documentation]. Figure 5 A parallel circuit is formed between the charger 32 and the main charger 31 to charge the battery module 34.

[0073] In some embodiments, the number of chargers 32 is two or more, see [link to relevant documentation]. Figure 6 Each slave charger 32 and the main charger 31 form a parallel circuit to charge the battery module 34.

[0074] Line component 33 is electrically connected to both the main charger 31 and the slave charger 32. For example, the user connects the main charger 31 and the slave charger 32 using line component 33 according to line connection rules. The main charger 31 interacts with the slave charger 32 based on line component 33 to detect the line status of the slave charger 32. The line status refers to the connection status of the slave charger with its adjacent chargers. If the line between the slave charger and its adjacent charger is disconnected, the line status is abnormal. If the line between the slave charger and its adjacent charger is connected, the line status is normal.

[0075] This embodiment uses at least two chargers to build a series or parallel circuit, which meets the battery module's requirements for high charging voltage or high charging power, thus improving the low charging efficiency of existing technologies. Furthermore, this embodiment can detect the wiring status of the chargers, proactively identifying wiring problems and preventing safety accidents or the reduction in charging efficiency caused by discovering faulty wiring during the charging process.

[0076] In some embodiments, the master charger 31 responds to a mode command, enters a line detection mode corresponding to a series circuit or a parallel circuit, and interacts with the slave charger 32 based on the line component 33 in the line detection mode.

[0077] In some embodiments, the mode command is a series mode command. The master charger 31 responds to the series mode command, enters the line detection mode corresponding to the series circuit, and interacts with the slave charger 32 based on the line component 33 in the line detection mode. In some embodiments, the mode command is a parallel mode command. The master charger 31 responds to the parallel mode command, enters the line detection mode corresponding to the parallel circuit, and interacts with the slave charger 32 based on the line component 33 in the line detection mode. The line detection operation for the series circuit is different from that for the parallel circuit.

[0078] It is understandable that mode commands can be generated by the user operating the function keys on the main charger, or mode commands can be sent by the user remotely to the main charger.

[0079] When the main charger 31 and the slave charger 32 form different circuits, such as a series circuit or a parallel circuit, this embodiment can control the main charger 31 to enter the corresponding line detection mode, thereby ensuring that the main charger 31 can be compatible with line detection operations of different circuits, thereby improving the application range of the charging device 300.

[0080] In some embodiments, please refer to Figure 7 The line component 33 includes a communication line 331 and a common line 332.

[0081] Communication line 331 is electrically connected to both the master charger 31 and the slave charger 32. For example, communication line 331 is electrically connected to the communication interface circuits of both the master charger 31 and the slave charger 32. Communication line 331 can support any suitable communication protocol, such as a CAN line. The master charger 31 interacts with the slave charger 32 via communication line 331. For instance, the master charger 31 broadcasts a detection command via communication line 331, and each slave charger 32 can receive the detection command via communication line 331. Alternatively, the slave charger 32 broadcasts a line success message via communication line 331, and the master charger 31 receives the line success message via communication line 331.

[0082] The common line 332 is electrically connected to both the main charger 31 and the slave charger 32. The slave charger 32 detects the line status based on the reference signal transmitted through the common line 332. The main charger 31 can apply a reference signal to the common line 332, which can then transmit the reference signal to each slave charger 32. Alternatively, each slave charger 32 can apply a reference signal to the common line 332, which can then transmit the reference signal to the remaining slave chargers 32 and the main charger 31.

[0083] This embodiment connects the main charger 31 and each slave charger 32 by setting up a communication line 331 and a common line 332, which is beneficial for interaction and detection of line status.

[0084] In some embodiments, the master charger 31 broadcasts a detection command based on the communication line 331, and each slave charger 32 responds to the detection command and performs a line detection operation of the target loop to detect the line status according to the reference signal transmitted by the common line 332, wherein the target loop includes a series loop or a parallel loop.

[0085] The line detection operation is used to detect the line status of the slave chargers. The line detection operation for series circuits differs from that for parallel circuits. If the target circuit is a series circuit, the master charger 31 broadcasts a detection command based on communication line 331 to control each slave charger 32 to perform the series circuit line detection operation according to a reference signal. If the target circuit is a parallel circuit, the master charger 31 broadcasts a detection command based on communication line 331 to control each slave charger 32 to perform the parallel circuit line detection operation according to a reference signal.

[0086] In this embodiment, the main charger 31 coordinates the line detection operations of each slave charger, which helps to improve the efficiency of line detection.

[0087] In some embodiments, if the target loop is a series loop and the reference signal is a series reference signal, the detection command includes a series detection command, wherein the series reference signal is a reference signal applied to a common line in the series loop to detect the line status, and the series detection command is a detection command used to detect the line status in the series loop.

[0088] The slave charger with the pending address responds to the series detection command and detects the line status between the slave charger with the pending address and the charger connected to it according to the series reference signal. The address of the master charger on the series circuit is given by default.

[0089] In some embodiments, the address of the main charger in the series circuit is the starting address.

[0090] In some embodiments, the address of the main charger in the series circuit is the end address.

[0091] A slave charger with an address pending is a slave charger whose address has not yet been determined in the series circuit.

[0092] Please see Figure 8 The 0th charger 80, the 1st charger 81, and the 2nd charger 82 form a series circuit to provide power to the battery module 83, wherein the 0th charger 80 is configured as the main charger, and the 1st charger 81 and the 2nd charger 82 are configured as slave chargers.

[0093] During initialization, the address of charger 0 (80) is given by default; for example, the address of charger 0 (80) in the series circuit is "0", and the address "0" of charger 0 (80) is known. Furthermore, the addresses of charger 1 (81) and charger 2 (82) in the series circuit are unknown during initialization; that is, the addresses of charger 1 (81) and charger 2 (82) are to be determined.

[0094] Both charger 81 and charger 82 receive a series connection detection command via communication line 84. Since charger 80 is connected to charger 81, charger 81 responds to the series connection detection command and checks the line status between charger 81 and charger 80. Similarly, since charger 81 is connected to charger 82, charger 82 responds to the series connection detection command and checks the line status between charger 81 and charger 81.

[0095] In some embodiments, when the highest output voltage of a single charger is lower than the module voltage of the battery module, multiple chargers can be connected in series to increase the output voltage.

[0096] In some embodiments, if the line status is normal, the slave charger with an address pending determines its address based on the address identifier carried by the series detection command. The address identifier is used to mark the slave charger's address in the series circuit.

[0097] In some embodiments, the slave charger with the address to be determined uses the address identifier as the address. For example, if the address identifier is "0012", then the address of the slave charger with the address to be determined is "0012".

[0098] In some embodiments, the address identifier can also be used to mark the number of times the master charger sends a series detection command. As mentioned above, the master charger coordinates the line detection operations of each slave charger. Each time a series detection command is sent, the address of a slave charger on the series circuit can be determined. Therefore, when the i-th series detection command is sent, the i-th series detection command carries the address identifier "i". Thus, the address of the slave charger whose address is to be determined can be "i".

[0099] In some embodiments, if the line status is normal, the slave charger with the most recently determined address broadcasts a successful connection message based on the communication line. The master charger then checks whether the slave charger with the most recently determined address has reconnected to the battery module based on the successful connection message.

[0100] The serial connection success message indicates that the line status of the most recently determined slave charger is normal. Although the line status of the most recently determined slave charger and the preceding charger is normal, the most recently determined slave charger may reconnect to the battery module or continue connecting to the next slave charger with an pending address. If the most recently determined slave charger reconnects to the battery module, it means that the line status detection of all chargers in the series loop has been completed.

[0101] Please continue reading. Figure 8 Since the 0th charger 80 (the main charger) is unaware that the 2nd charger 82 is the last charger in the series circuit, after determining the line status of each slave charger, the 0th charger 80 must check whether each slave charger is reconnected to the battery module. That is, it needs to determine whether the line status of all chargers in the series circuit has been checked.

[0102] Therefore, based on the successful serial connection information, the main charger detects whether the slave charger with the most recently determined address has reconnected to the battery module. Thus, this embodiment can complete the closed-loop, intelligent, and automatic detection of the line status of each slave charger in the serial circuit.

[0103] In some embodiments, when the main charger detects whether the slave charger with the most recently determined address has reconnected to the battery module based on the serial connection success information, after receiving the serial connection success information, the main charger broadcasts a reconnection detection command based on the communication line. The slave charger with the most recently determined address responds to the reconnection detection command by applying a reconnection detection signal to the common line. The main charger detects whether the slave charger with the most recently determined address has reconnected to the battery module based on the voltage difference between the common line and the first terminal. The voltage amplitude of the reconnection detection signal is the third voltage difference between the common line and the first terminal. The third voltage difference, the second voltage difference, and the first voltage difference can be the same or different, for example, all three can be 5V.

[0104] In some embodiments, if the line status is abnormal, the main charger ends the line detection operation and no longer broadcasts the serial detection command based on the communication line.

[0105] In some embodiments, if the master charger does not receive a successful connection message within a preset time period, it determines that the line status of the slave charger with the pending address is abnormal.

[0106] In some embodiments, the master charger is equipped with a timer, which starts counting each time a series detection command is sent. When the master charger detects that the timer has reached a predetermined time, it determines that the line status of the slave charger with the pending address is abnormal.

[0107] In some embodiments, the series reference signal is a reference signal applied to the common line by the charger whose address is most recently determined in response to the series detection command, relative to the slave charger whose current address is yet to be determined.

[0108] For example, please continue reading Figure 8 During initialization, the address of charger 0 (main charger) 80 is the most recently determined relative to the other chargers; for example, during initialization, the address of charger 0 80 is "0". Charger 0 80 sends a first series detection command. Chargers 1 81 and 2 82 both respond to the first series detection command. Charger 0 80 applies a series reference signal to the common line 85, and charger 1 81 detects the line status with charger 0 80, while charger 2 82 detects the line status with charger 1 81.

[0109] If the first charger 81 detects that the line status between it and the 0th charger 80 is normal, and the second charger 82 detects that the line status between it and the first charger 81 is abnormal, then the first charger 81 determines the address according to the address identifier of the first series detection command. For example, the first charger 81 determines its own address in the series circuit as "1".

[0110] The first charger 81 broadcasts a successful serial connection message based on the communication line. The second charger 80, based on the successful serial connection message, checks whether the first charger 81 has reconnected to the battery module. Since the first charger 81 has not reconnected to the battery module, the second charger 80 sends a second serial connection detection command.

[0111] Next, the address of the first charger 81 is the most recently determined relative to the 0th charger 80 and the 2nd charger 82. The 0th charger 80 sends a second serial detection command. Both the 1st charger 81 and the 2nd charger 82 respond to the first serial detection command, wherein the 1st charger 81 applies a reference signal to the common line 85, and the 2nd charger 82 detects the line status with the 1st charger 81.

[0112] If the second charger 82 detects that the line status between it and the first charger 81 is normal, then the second charger 82 determines the address according to the address identifier of the second series detection command. For example, the second charger 82 determines its own address in the series circuit as "2".

[0113] The second charger 82 broadcasts a successful connection message based on the communication line. The first charger 80, based on this message, checks whether the second charger 82 has reconnected to the battery module. Since the second charger 82 has reconnected to the battery module, the first charger 80 terminates the line detection operation.

[0114] In some embodiments, each charger includes a positive terminal and a negative terminal. The voltage amplitude of the series reference signal is a first voltage difference between the common line and the first terminal. The slave charger with the address to be determined detects the line status between itself and the chargers connected to it based on a second voltage difference between the common line and the second terminal and the first voltage difference. In some embodiments, when the first terminal is negative, the second terminal is positive; and when the first terminal is positive, the second terminal is negative.

[0115] In some embodiments, if the second differential pressure is equal to the first differential pressure, the line is in a normal state; if the second differential pressure is not equal to the first differential pressure, the line is in an abnormal state.

[0116] Understandably, the first and second differential pressures can be customized by the designer based on engineering experience, for example, both the first and second differential pressures can be 5V.

[0117] For example, suppose the first electrode is the negative electrode and the second electrode is the positive electrode. See also... Figure 9 During initialization, the 0th charger 90, with its first terminal as ground, applies a 5V first voltage difference to the common line 95 as a series reference signal. For example... Figure 9 As shown, the 0th charger 90 control selector 901 selects to connect to the first transmission path S1.

[0118] When the first charger 91 detects the line status between itself and the zeroth charger 90, it detects whether the second voltage difference between the common line 95 and the second terminal is equal to the first voltage difference. For example... Figure 9 As shown, the first charger 91 controls the selector 911 to connect to the second transmission path S4. Since the first transmission path S1, the common line 95, and the second transmission path S4 are connected, the potential of the first terminal of the first charger 91 is equal to the potential of the second terminal of the zero charger 90. Therefore, the first charger 91 can determine the line status between the first charger 91 and the zero charger 90 based on the second voltage difference and the first voltage difference between the common line 95 and the second terminal.

[0119] If the line between the first charger 91 and the zero charger 90 is in an abnormal state, the second voltage difference will not be equal to the first voltage difference. If the line between the first charger 91 and the zero charger 90 is in a normal state, the second voltage difference will be equal to the first voltage difference, and the first charger 91 will broadcast a successful connection message based on the communication line 94.

[0120] If the circuit between the first charger 91 and the zeroth charger 90 is in a normal state, the zeroth charger 90 checks whether the first charger 91 is reconnected to the battery module 93. Figure 9 As shown, the first charger 91's control selector 911 selects to connect to the first transmission path S3, and applies a 5V back-connection detection signal to the common line 95 with the negative terminal as ground. The second charger 90's control selector 901 selects to connect to the first transmission path S1, and detects that the voltage of the common line 95 relative to the negative terminal is not equal to 5V. Therefore, the second charger 90 determines that the first charger 91 has not back-connected to the battery module 93.

[0121] Next, the first charger 91 controls the selector 911 to select the connection to the first transmission path S3. When the second charger 92 detects the line status between itself and the first charger 91, it detects whether the second voltage difference between the common line 95 and the second terminal is equal to the first voltage difference. Figure 9 As shown, the second charger 92 controls the selector 921 to connect to the second transmission path S6. Since the first transmission path S3, the common line 95, and the second transmission path S6 are connected, the potential of the first terminal of the second charger 92 is equal to the potential of the second terminal of the first charger 91. Therefore, the second charger 92 can determine the line status between the second charger 92 and the first charger 91 based on the second voltage difference and the first voltage difference between the common line 95 and the second terminal.

[0122] If the circuit between the second charger 92 and the first charger 91 is in a normal state, the first charger 90 checks whether the second charger 92 is reconnected to the battery module 93. Figure 9 As shown, the second charger 92 control selector 921 selects to connect to the first transmission path S5, and applies a 5V reconnection detection signal to the common line 95 with the negative terminal as ground. The first charger 90 control selector 901 selects to connect to the first transmission path S1. When it detects that the voltage of the common line 95 relative to the negative terminal is equal to 5V, the first charger 90 determines that the second charger 92 is reconnected to the battery module 93.

[0123] In some embodiments, when the charger with the most recently determined address receives serial connection success information based on the communication line, and the charger with the most recently determined address detects the first stop detection information, it stops applying the serial connection detection signal to the common line.

[0124] In some embodiments, the first stop detection information is a serial connection success information. When the charger with the most recently determined address receives the serial connection success information based on the communication line, it stops applying the serial connection detection signal to the common line.

[0125] In some embodiments, the first stop detection information is information that the first local time has reached a predetermined time. When the charger whose address is most recently determined detects information that the first local time has reached the predetermined time, it stops applying the series detection signal to the common line.

[0126] In some embodiments, the main charger detects a battery module whose address has been most recently determined and broadcasts a detection termination message over the communication line.

[0127] In some embodiments, when the charger with the most recently determined address receives the detection end information based on the communication line, the charger with the most recently determined address stops applying the return connection detection signal to the common line when it detects the detection line end information.

[0128] In some embodiments, the line end information is detection end information. When the charger with the most recently determined address receives the detection end information based on the communication line, it stops applying the reconnection detection signal to the common line.

[0129] In some embodiments, the detection end information is the information that the second local time has reached a predetermined time. When the charger whose address is most recently determined detects the information that the second local time has reached the predetermined time, it stops applying the back-connection detection signal to the common line.

[0130] To elaborate on the circuit detection operation when the target circuit is a series circuit, the following description provides a detailed explanation:

[0131] Step 1. Charger 0 broadcasts the i-th serial detection command based on the communication line, where i is a positive integer. Charger 0 is the master charger, and Charger 0 starts the first timer to begin counting.

[0132] Step 2. According to the i-1 series detection command, the i-1 charger applies a series detection signal with a first voltage difference to the common line. For example, the i-1 slave charger applies a 5V series detection signal to the common line with the negative terminal as ground, and the i-1 charger starts the second timer to start counting.

[0133] Step 3. The address to be determined receives the i-th series detection command from the charger, and detects the second voltage difference between the common line and the second terminal, for example, the second voltage difference between the common line and the positive terminal.

[0134] Step 4. When the slave charger with the pending address determines that the second voltage difference equals the first voltage difference, it broadcasts a successful connection message based on the communication line. The successful connection message indicates that the line status of the i-th slave charger is normal. At the same time, the slave charger with the pending address sets i to its local address, and the slave charger with the pending address is the i-th slave charger.

[0135] Step 5. After the (i-1)th step detects the first stop detection information from the charger, it stops applying the series detection signal to the common line, wherein the first stop detection information is a successful serial connection information or information that the local timer of the second timer has reached a predetermined time.

[0136] Step 6. If the 0th charger receives a successful serialization message via the communication line, proceed to step 8. If the 0th charger does not receive a successful serialization message via the communication line or the local timer of the first timer reaches the predetermined time, proceed to step 7.

[0137] Step 7. Generate line anomaly report information and end the line detection operation.

[0138] Step 8. The 0th charger sends the i-th reconnection detection command based on the communication line and starts the third timer to begin timing.

[0139] Step 9. The i-th charger receives the i-th back-connection detection command based on the communication line, applies a back-connection detection signal to the common line, for example, with the negative terminal as the i-th, applies a 5V back-connection detection signal to the common line, and starts the fourth timer to start timing.

[0140] Step 10. The 0th charger checks whether the i-th slave charger is reconnected to the battery module. For example, the 0th charger checks whether the voltage difference between the common line and the negative terminal is 5V. If yes, jump to step 11; if no, jump to step 13.

[0141] Step 11. Charger 0 broadcasts the detection end information based on the communication line and proceeds to step 12.

[0142] Step 12. After receiving the detection end information or detecting that the local timing of the fourth timer has reached the predetermined time, the i-th charger stops applying the return connection detection signal to the common line.

[0143] Step 13. After the 0th charger detects that the local timing of the third timer has arrived, if the voltage difference between the common line and the negative terminal is not equal to 5V, assign the value i = i + 1 and return to step 1.

[0144] Therefore, when the target circuit is a series circuit, the circuit detection operation is as described above.

[0145] 1.1 Functions of the charger:

[0146] In a series circuit, the main charger acts as the control core of the series circuit and is responsible for the following tasks:

[0147] (1) Communicate with the battery module. Monitor the unit voltage of each charger, the module temperature of the battery module, and the module voltage of the battery module.

[0148] (2) Responsible for testing the lines between each charger to ensure that the high-voltage cables are properly connected.

[0149] (3) Assignment of charging tasks. Ensure that the output power load of each charger is balanced.

[0150] (4) Charging process management. Responsible for charging initiation, charging mode control, output power adjustment, and charging termination.

[0151] (5) Status monitoring between chargers.

[0152] (6) Remotely start the charger.

[0153] Therefore, the charger is responsible for performing the following tasks:

[0154] (1) Detect and monitor the operating environment to ensure its security.

[0155] (2) Start charging according to the needs of the main charger and output electrical energy at the specified voltage.

[0156] (3) Monitor various operating statuses and report the status to the main charger.

[0157] (4) Supports remote start and stop control.

[0158] 1.2 Workflow:

[0159] The workflow of the charger series connection includes several stages: user preparation, startup, charging preparation, charging and termination. The work content of each stage is shown in Table 1:

[0160] Table 1

[0161]

[0162] 1.3 Charging control logic:

[0163] The charging logic is shown in Table 2:

[0164] Table 2

[0165]

[0166] 1.4 Load Regulation

[0167] When adjusting the charging output voltage, if the adjustment amount is small, it can be adjusted on a single charger; otherwise, it can be adjusted on all chargers. When adjusting on a single charger, if it is a boost converter, select the power supply with the lower voltage output; if it is a buck converter, select the power supply with the highest voltage output.

[0168] If the target circuit is a parallel circuit, the reference signal is the first parallel reference signal, the detection command includes the first parallel detection command, the master charger applies the first parallel reference signal to the common line, each slave charger responds to the first parallel detection command, and when it is determined that the third voltage difference of the common line relative to the first electrode matches the first parallel reference signal, it broadcasts the first parallel success information based on the communication line.

[0169] In some embodiments, upon responding to a first parallel detection command, the charger determines that the third voltage difference between the common line and the first electrode does not match the first parallel reference signal, and broadcasts first parallel failure information based on the common line.

[0170] In some embodiments, the detection command includes a second parallel detection command, in which the master charger applies a second parallel reference signal to the common line, and each slave charger responds to the second parallel detection command and, when it determines that the fourth voltage difference of the common line relative to the second electrode matches the second parallel reference signal, broadcasts a second parallel success message based on the communication line.

[0171] In some embodiments, upon responding to a second parallel detection command, the charger determines that the fourth differential voltage between the common line and the second electrode terminal does not match the second parallel reference signal, and broadcasts second parallel failure information based on the common line.

[0172] In some embodiments, the master charger determines the number of slave chargers whose line status is normal based on the first parallel connection success information and the second parallel connection success information.

[0173] In some embodiments, both the first parallel connection success information and the second parallel connection success information carry device information. The master charger determines the number of slave chargers whose line status is normal based on the device information carried in the first parallel connection success information and the device information carried in the second parallel connection success information.

[0174] In some embodiments, the master charger distributes power among slave chargers in a normal line state, based on the number of slave chargers.

[0175] To elaborate on the line detection operation when the target circuit is a parallel circuit, the following description will provide a more detailed explanation:

[0176] Step 1. The main charger broadcasts the first parallel detection command based on the communication line and applies the first parallel reference signal to the common line. For example, with the negative terminal as ground, a 5V first parallel reference signal is applied to the common line, and the fifth timer is started at the same time.

[0177] Step 2. All chargers receive the first parallel detection command via the communication line, detect the third voltage difference between the common line and the negative terminal, and determine whether the third voltage difference is equal to the first parallel reference signal. If yes, broadcast the first parallel success information via the communication line and proceed to step 3. If no, broadcast the first parallel failure information via the common line.

[0178] Step 3. The main charger receives the first parallel connection success information based on the communication line, and registers the slave device detection results according to the first parallel connection success information.

[0179] Step 4. After the local timing of the fifth timer reaches the predetermined time, the main charger broadcasts the second parallel detection command based on the communication line. The main charger applies the second parallel reference signal to the common line, for example, with the positive terminal as ground, applies the second parallel reference signal of 5V to the common line, and at the same time starts the sixth timer.

[0180] Step 5. All devices receiving the second parallel detection command via the communication line detect the fourth voltage difference between the common line and the positive terminal, and determine whether the fourth voltage difference is equal to the second parallel reference signal. If yes, broadcast the second parallel success information via the communication line and execute step 5. If no, broadcast the second parallel failure information via the common line.

[0181] Step 5. After the local timer of the sixth timer reaches the predetermined time, the main charger determines the number of slave chargers with the line status in normal state based on the first parallel connection success information and the second parallel connection success information.

[0182] To further elaborate on the line testing operation when the target circuit is a parallel circuit, the following section will combine... Figure 10 This will be explained in detail below:

[0183] For example, suppose the first electrode is the negative electrode and the second electrode is the positive electrode. See also... Figure 10 During initialization, the 0th charger 500 sends a first parallel detection command based on the communication line, and applies a third voltage difference of 5V to the common line 55 as the first parallel reference signal, with the first terminal as ground. Figure 10 As shown, the 0th charger 500 control selector 501 selects to connect to the first transmission path L1.

[0184] When the first charger 510 detects the line status between itself and the zero charger 500, it detects whether the voltage difference between the common line 55 and the first terminal is equal to the third voltage difference. For example... Figure 10As shown, the first charger 510 controls the selector 511 to connect to the first transmission path L3. Since the first transmission path L1, the common line 55, and the first transmission path L3 are connected, the potential of the first terminal of the first charger 510 is equal to the potential of the first terminal of the zero charger 500. Therefore, the first charger 510 can determine the line status between the first charger 510 and the zero charger 500 based on the voltage difference between the common line 55 and the first terminal and the third voltage difference.

[0185] If the line status between the first charger 510 and the zero charger 500 is abnormal, the voltage difference between the common line 55 and the first terminal is not equal to the third voltage difference. If the line status between the first charger 510 and the zero charger 500 is normal, the voltage difference between the common line 55 and the first terminal is equal to the third voltage difference, and the first charger 510 broadcasts a first parallel connection success message based on the communication line 54.

[0186] Similarly, the circuit status between the second charger 520 and the first charger 500 is as described above, and will not be repeated here.

[0187] When the line status between the first charger 510 and the zero charger 500, and the line status between the second charger 520 and the zero charger 500, are both normal, the zero charger 500 sends a second parallel detection command based on the communication line, and applies a fourth voltage difference of 5V to the common line 55 as a second parallel reference signal, with the second terminal as ground. Figure 10 As shown, the 0th charger 500 control selector 501 selects to connect to the second transmission path L2.

[0188] When the first charger 510 detects the line status between itself and the zeroth charger 500, it detects whether the voltage difference between the common line 55 and the second terminal is equal to the fourth voltage difference. For example... Figure 10 As shown, the first charger 510 controls the selector 511 to connect to the second transmission path L4. Since the second transmission path L2, the common line 55, and the second transmission path L4 are connected, the potential of the second terminal of the first charger 510 is equal to the potential of the second terminal of the zero charger 500. Therefore, the first charger 510 can determine the line status between the first charger 510 and the zero charger 500 based on the voltage difference between the common line 55 and the second terminal and the fourth voltage difference.

[0189] If the line status between the first charger 510 and the zero charger 500 is abnormal, the voltage difference between the common line 55 and the second terminal is not equal to the fourth voltage difference. If the line status between the first charger 510 and the zero charger 500 is normal, the voltage difference between the common line 55 and the second terminal is equal to the fourth voltage difference, and the first charger 510 broadcasts a second parallel connection success message based on the communication line 54. The zero charger 500 determines the number of slave chargers with a normal line status based on the first and second parallel connection success messages.

[0190] In some embodiments, the output voltage of all chargers needs to be kept consistent, and the charging current is distributed evenly. When the main charger determines to adjust the charging current based on the detected temperature, module voltage, and unit voltage, it achieves charging current regulation by uniformly adjusting the output voltage of all power supplies.

[0191] In some embodiments, when high-efficiency charging is required, multiple chargers can be connected in parallel to improve charging efficiency. When chargers are connected in parallel, each charger must output the same voltage; therefore, when regulating the output voltage of the chargers, it is necessary to uniformly regulate all chargers connected in parallel. The workflow of parallel chargers is the same as that of series chargers, as shown in Table 1, but there are differences in line detection and charging load distribution.

[0192] As another aspect of this invention, an embodiment of the invention provides a charging system. Please refer to... Figure 11 The charging system 600 includes a charging device 61 and a battery module 62. The charging device 61 is the charging device described in the above embodiments, and the battery module 62 is electrically connected to both a main charger and a slave charger. The charging device 61 provides power to the battery module, which then charges according to the power supply. The charging device 61 can provide the battery module with a charging voltage of any amplitude or a charging power of any value. The battery module can be a power battery, a storage battery, or a module composed of multiple storage batteries, etc.

[0193] It should be noted that in the above embodiments, there is no necessarily a certain order between the steps. Those skilled in the art can understand from the description of the embodiments of the present invention that the above steps may have different execution orders in different embodiments, that is, they may be executed in parallel or in turn, etc.

[0194] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0195] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A charging device, characterized in that, include: The main charger is used for electrical connection to the battery module; The slave charger is used to form a series or parallel circuit with the main charger to charge the battery module; A line assembly is electrically connected to both the master charger and the slave charger, wherein the master charger interacts with the slave charger based on the line assembly to detect the line status of the slave charger; the line assembly includes: a communication line electrically connected to both the master charger and the slave charger, wherein the master charger interacts with the slave charger based on the communication line; and a common line electrically connected to both the master charger and the slave charger, wherein the slave charger detects the line status based on a reference signal transmitted by the common line. The master charger broadcasts a detection command based on the communication line, and each slave charger responds to the detection command and performs a line detection operation of the target loop to detect the line status according to the reference signal transmitted on the common line. The target circuit includes a parallel circuit, the reference signal is a first parallel reference signal, the detection command includes a first parallel detection command, the master charger applies the first parallel reference signal to the common line, and each slave charger responds to the first parallel detection command and, when it determines that the third voltage difference of the common line relative to the first electrode matches the first parallel reference signal, broadcasts a first parallel connection success message based on the communication line.

2. The apparatus according to claim 1, characterized in that, The master charger responds to the mode command and enters the line detection mode corresponding to the series circuit or the parallel circuit, and interacts with the slave charger based on the line components in the line detection mode.

3. The apparatus according to claim 1, characterized in that, The target circuit includes a series circuit.

4. The apparatus according to claim 3, characterized in that, If the target circuit is a series circuit, the reference signal is a series reference signal, the detection command includes a series detection command, the slave charger with the address to be determined responds to the series detection command, and detects the line status between the slave charger with the address to be determined and its connected charger according to the series reference signal, and the address of the master charger on the series circuit is given by default.

5. The apparatus according to claim 4, characterized in that, If the line status is normal, the slave charger with the pending address determines the address based on the address identifier carried by the serial detection command.

6. The apparatus according to claim 5, characterized in that, If the line status is normal, the slave charger with the most recently determined address broadcasts a successful connection message based on the communication line. The master charger then checks whether the slave charger with the most recently determined address has reconnected to the battery module based on the successful connection message.

7. The apparatus according to claim 4, characterized in that, The series reference signal is: the reference signal applied to the common line by the charger whose address is most recently determined in response to the series detection command, relative to the slave charger whose current address is yet to be determined.

8. The apparatus according to claim 7, characterized in that, Each charger includes a positive terminal and a negative terminal; The voltage amplitude of the series reference signal is the first voltage difference between the common line and the first terminal. The slave charger with the address to be determined detects the line status between itself and the charger connected to it based on the second voltage difference between the common line and the second terminal and the first voltage difference.

9. The apparatus according to claim 8, characterized in that, If the second pressure difference is equal to the first pressure difference, the line is in a normal state; if the second pressure difference is not equal to the first pressure difference, the line is in an abnormal state.

10. The apparatus according to claim 1, characterized in that, The detection command includes a second parallel detection command. The master charger applies a second parallel reference signal to the common line. Each slave charger responds to the second parallel detection command and, when it determines that the fourth voltage difference between the common line and the second electrode matches the second parallel reference signal, broadcasts a second parallel success message based on the communication line.

11. The apparatus according to claim 10, characterized in that, The main charger determines the number of slave chargers whose line status is normal based on the first and second parallel connection success information.

12. A charging system, characterized in that, include: The charging device according to any one of claims 1 to 11; The battery module is electrically connected to both the main charger and the slave charger.

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