Battery parallel connection device and method and battery management system

Abstract

The invention provides a battery parallel connection device and method and a battery management system. The battery parallel connection device comprises a control circuit, a first battery circuit, a butt joint terminal and a second battery circuit, wherein the control circuit is connected with the first battery circuit; the control circuit and the first battery circuit are respectively connected with the butt joint terminal; the butt joint terminal is connected with the second battery circuit; the control circuit is used for detecting a circuit signal output by the second battery circuit through the butt-joint terminal so as to judge whether the butt-joint terminal is correctly connected or not, and controlling the control switch in the first battery circuit to be switched on in response to the correct connection; and the butt joint terminal is used for outputting a circuit signal of the second battery circuit to the control circuit and enabling the first battery circuit and the second battery circuit to carry out current flowing under the condition that the control switch is switched on, so that parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit is realized. Through the device, the reliability, the safety and the efficiency of battery parallel connection are improved.

Description

Technical Field

[0001] The present application relates to the field of battery management and electronic control technology, and in particular to a battery parallel connection device, method and battery management system. Background Art

[0002] With the development of life and industry, the electricity consumption of electrical equipment has gradually increased. In the process of new energy development, battery energy storage is one of the important links. Therefore, it is necessary to expand the capacity of the battery, that is, to use multiple groups of batteries in parallel. However, as the voltage level of the battery continues to increase, it may even cause harm to the human body.

[0003] At present, in the existing technology for connecting two groups of batteries in parallel, wire connection and quick plug are usually used to achieve it. Among them, the wire connection method is relatively complicated and slow, which reduces the efficiency of battery parallel connection; and although the quick plug method can quickly connect and disconnect the batteries, due to the high output voltage of the port of the quick plug connector, there is a risk of electric shock to users due to accidental touch, which reduces the reliability and safety of battery parallel connection. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery parallel connection device, method and battery management system, which outputs a circuit signal of a second battery circuit to a control circuit through a docking terminal, and the control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, so as to control the port voltage of the docking terminal. When it is determined that the docking terminal is correctly connected, the control switch in the first battery circuit is controlled to be turned on, so that current flows between the first battery in the first battery circuit and the second battery in the second battery circuit, so as to realize parallel connection between the batteries, thereby improving the reliability and safety of the battery parallel connection, and thus improving the efficiency of the battery parallel connection.

[0005] Based on the above purpose, in a first aspect of the present application, a battery parallel connection device is provided, including a control circuit, a first battery circuit, a docking terminal, and a second battery circuit:

[0006] The control circuit is connected to the first battery circuit; the control circuit and the first battery circuit are respectively connected to the docking terminal; the docking terminal is connected to the second battery circuit;

[0007] The control circuit is used to detect the circuit signal output by the second battery circuit through the docking terminal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, control the control switch in the first battery circuit to turn on;

[0008] The docking terminal is used to output a circuit signal of the second battery circuit to the control circuit, and when the control switch is turned on, current flows between the first battery circuit and the second battery circuit to achieve a parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit.

[0009] In a second aspect of the present application, a battery parallel connection method is provided, comprising:

[0010] Outputting a circuit signal of the second battery circuit to the control circuit through the docking terminal;

[0011] The control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, controls the control switch in the first battery circuit to turn on;

[0012] When the control switch is turned on, the butting terminal allows current to flow between the first battery circuit and the second battery circuit, so as to achieve parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit.

[0013] In a third aspect of the present application, a battery management system is provided, wherein the battery management system includes the battery parallel connection device as described in the first aspect.

[0014] From the above description, it can be seen that a battery parallel connection device, method and battery management system provided in the embodiments of the present application output a circuit signal of the second battery circuit to the control circuit through the docking terminal, and the control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, so as to control the port voltage of the docking terminal. When it is determined that the docking terminal is correctly connected, the control switch in the first battery circuit is controlled to be turned on, so that current flows between the first battery in the first battery circuit and the second battery in the second battery circuit, so as to realize parallel connection between the batteries.

[0015] Compared with the devices in the prior art that adopt wire connection and quick plug-in form, the reliability and safety of battery parallel connection are improved, thereby improving the efficiency of battery parallel connection.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of an exemplary battery parallel connection device according to an embodiment of the present application is shown;

[0019] Figure 2 A second structural schematic diagram of an exemplary battery parallel connection device according to an embodiment of the present application is shown;

[0020] Figure 3 A flow chart of an exemplary battery parallel connection method according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] After research, it was found that, currently, in the existing technology for connecting two groups of batteries in parallel, wire connection and quick plug are usually used to achieve it. Among them, the wire connection method is relatively complicated and slow, which reduces the efficiency of battery parallel connection; and although the quick plug method can quickly connect and disconnect the battery, due to the high output voltage of the port of the quick plug connector, there is a risk of electric shock to the user due to accidental touch, which reduces the reliability and safety of the battery parallel connection.

[0024] Based on this, an embodiment of the present application provides a battery parallel device, which outputs a circuit signal of a second battery circuit to a control circuit through a docking terminal, and the control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, so as to control the port voltage of the docking terminal. When it is determined that the docking terminal is correctly connected, the control switch in the first battery circuit is controlled to be turned on, so that current flows between the first battery in the first battery circuit and the second battery in the second battery circuit, so as to realize parallel connection between the batteries, thereby improving the reliability and safety of the battery parallel connection, and thereby improving the efficiency of the battery parallel connection.

[0025] Figure 1 One of the structural schematic diagrams of an exemplary battery parallel connection device according to an embodiment of the present application is shown.

[0026] like Figure 1 As shown in , the battery parallel connection device provided in an embodiment of the present application may include a control circuit 110 , a first battery circuit 120 , a docking terminal 130 , and a second battery circuit 140 .

[0027] The control circuit 110 is connected to the first battery circuit 120 ; the control circuit 110 and the first battery circuit 120 are respectively connected to the docking terminal 130 ; and the docking terminal 130 is connected to the second battery circuit 140 .

[0028] The control circuit 110 is used to detect the circuit signal output by the second battery circuit 140 through the docking terminal 130 to determine whether the docking terminal 130 is correctly connected, and in response to determining that the docking terminal 130 is correctly connected, control the control switch S1 in the first battery circuit 120 to turn on.

[0029] Here, the circuit signal may include but is not limited to at least one of a voltage signal, a current signal and a temperature signal.

[0030] Figure 2 A second structural schematic diagram of an exemplary battery parallel device according to an embodiment of the present application is shown.

[0031] like Figure 2 As shown in FIG. 1 , the control circuit 110 includes a controller U1 , a first resistor R1 , and a second resistor R2 .

[0032] Among them, the first end of the first resistor R1 and the negative end of the controller U1 are connected to the docking terminal 130; the positive end of the controller U1 is connected to the second end of the first resistor R1; the collector end of the controller U1 is connected to the first end of the second resistor R2; the emitter end of the controller U1 is connected to the first battery circuit 120; the second end of the second resistor R2 is connected to the charging power supply.

[0033] The charging power source may be configured as a DC power source with an output voltage of 12V, and is used to charge the batteries disposed in the first battery circuit 120 and the second battery circuit 140 .

[0034] The controller U1 may include at least one of a microcontroller chip or an application specific integrated circuit.

[0035] The controller U1 is used to detect the circuit signal to determine whether the docking terminal 130 is correctly connected, and in response to determining that the docking terminal 130 is correctly connected, control the control switch S1 in the first battery circuit 120 to be turned on.

[0036] Here, when the circuit signal is a voltage signal, the controller U1 detects a voltage signal corresponding to the port voltage outputted from the second battery circuit 140 outputted by the docking terminal 130, and compares the voltage signal with a preset signal threshold to determine whether the docking terminal 130 is correctly connected.

[0037] Specifically, when the voltage signal is less than or equal to a preset signal threshold, it is determined that the docking terminal 130 is correctly connected; when the voltage signal is greater than the preset signal threshold, it is determined that the docking terminal 130 is abnormally connected.

[0038] Furthermore, the controller U1 is further configured to control the control switch S1 in the first battery circuit 120 to be turned off in response to determining that there is a connection abnormality in the docking terminal 130 , so as to avoid the risk of electric shock caused by the flow of current.

[0039] Here, the connection abnormality may include but is not limited to abnormal conditions such as voltage abnormality, current abnormality, temperature abnormality and disconnection. In response to determining that the docking terminal 130 has a connection abnormality, the controller U1 sends a warning signal to the outside.

[0040] In summary, the control circuit 110 can control the electronic control method of the control switch S1 in the first battery circuit 120 by detecting the circuit signal of the docking terminal 130, and perform real-time control on the port voltage of the docking terminal 130 to ensure that the docking terminal 130 has no voltage output when it is not reliably connected, thereby avoiding the risk of electric shock to personnel due to excessive voltage, and ensuring that the battery management system can operate safely. Since the electronic control method has a high degree of automation, the operating process of battery parallel connection is simplified, the working efficiency of the battery management system is improved, and the need for manual intervention is reduced.

[0041] Further, such as Figure 2 As shown in , the controller U1 includes a transistor Q1 and a diode D1.

[0042] Among them, the emitter (E) of the transistor is connected to the first battery circuit 120; the collector (C) of the transistor Q1 is connected to the first end of the second resistor R2; the base (B) of the transistor Q1 is connected to the second end of the first resistor R1; the positive terminal of the diode D1 is connected to the second end of the first resistor R1; and the negative terminal of the diode D1 is connected to the docking terminal 130.

[0043] The transistor Q1 is used to control the control switch S1 in the first battery circuit 120 to be turned on based on the judgment result of the controller U1, and output the charging current of the charging power supply (12V) to the first battery circuit 120 when the control switch S1 is turned on.

[0044] The diode D1 is used to prevent the current input to the controller U1 from flowing in reverse direction, so as to protect the control circuit 110 .

[0045] In summary, when the controller U1 confirms that the docking terminal 130 has been reliably and correctly connected, the controller U1 will turn on the main power of the circuit by controlling the opening and closing of the control switch S1 in the first battery circuit 120, allowing current to flow; if the controller U1 detects that the docking terminal 130 is not firmly connected or not connected, the controller U1 will keep the control switch S1 closed to prevent current from flowing, thereby avoiding the risk of electric shock.

[0046] The first resistor R1 is used to limit the current input into the controller U1 to prevent the controller U1 from being damaged due to overcurrent. That is, the first resistor R1 can be used as a base resistor in the control circuit 110 .

[0047] Specifically, the first resistor R1 is used to limit the current input to the transistor Q1 in the controller U1 to prevent damage to the transistor Q1 controller caused by overcurrent.

[0048] The second resistor R2 is used to keep the transistor Q1 in the controller U1 at a high potential and in a cut-off state when no external signal is input to the controller U1 , that is, the second resistor R2 can be used as a pull-up resistor in the control circuit 110 .

[0049] Further, such as Figure 1 As shown in , the docking terminal 130 is used to output the circuit signal of the second battery circuit 120 to the control circuit 110, and when the control switch is turned on, current flows between the first battery circuit 120 and the second battery circuit 140 to achieve a parallel connection between the first battery in the first battery circuit 120 and the second battery in the second battery circuit 140.

[0050] Further, such as Figure 2 As shown in , the docking terminal 130 includes an input terminal row 131 and an output terminal row 132 .

[0051] The input terminal row 131 is connected to the control circuit 110 and the first battery circuit 120 respectively; the input terminal row 131 is connected to the output terminal row 132; and the output terminal row 132 is connected to the second battery circuit 140.

[0052] It should be noted that when it is necessary to connect the first battery 121 in the first battery circuit 120 and the second battery 141 in the second battery circuit 140 in parallel, it is necessary to connect the input terminal row 131 and the output terminal row 132 so that the control circuit 110 controls the control switch S1 in the first battery circuit 120 based on the circuit signal detected by the input terminal row 131 output, thereby enabling the first battery 121 and the second battery 141 to be connected in parallel.

[0053] The input terminal block 131 is used to receive the circuit signal output by the output terminal block 132 to output to the control circuit 110 , and output the current output by the first battery circuit 120 to the output terminal block 132 .

[0054] The output terminal row 132 is used to receive the circuit signal output by the second battery circuit 140 to output to the input terminal row 131 , and output the current output by the input terminal row 131 to the second battery circuit 140 .

[0055] Here, the input terminal row 131 and the output terminal row 132 are both quick-plug terminals to improve the connection stability of the docking terminal 130, thereby improving the operability and convenience of the battery management system.

[0056] Thus, by using the input terminal row 131 and the output terminal row 132 of quick-plug terminals, the connection and removal of the first battery 121 and the second battery 141 are made more convenient and quick, while reducing the risk of errors or failures caused by manual connection of the batteries.

[0057] Further, such as Figure 2 As shown in , the input terminal row 131 includes a first terminal interface 1311 and a second terminal interface 1312 , and the output terminal row 132 includes a first terminal docking pin 1321 and a second terminal docking pin 1322 .

[0058] Here, if Figure 2As shown in, the first terminal interface 1311 may include a first port A1, a second port A2 and a third port A3; the second terminal interface 1312 may include a port A4 and a port A5; the first terminal docking pin 1321 may include a first docking pin B1, a second docking pin B2 and a third docking pin B3; the first terminal docking pin 1322 may include a docking pin B4 and a docking pin B5.

[0059] The first port A1 and the second port A2 of the first terminal interface 1311 are respectively connected to the positive terminal and the negative terminal of the first battery circuit 120; the third port A3 of the first terminal interface 1311 is grounded; the second terminal interface 1312 is connected to the control circuit 110; the first terminal interface 1311 is connected to the first terminal docking pin 1321; the first docking pin B1 and the second docking pin B2 of the first terminal docking pin 1321 are respectively connected to the positive terminal and the negative terminal of the second battery circuit 140; the third docking pin B3 of the first terminal docking pin 1321 is grounded; the second terminal interface 1312 is connected to the second terminal docking pin 1322; the first terminal docking pin 1321 and the second terminal docking pin 1322 are respectively connected to the second battery circuit 140.

[0060] The length of the first terminal interface 1311 is greater than the length of the second terminal interface 1312 , and the length of the first terminal docking pin 1321 is greater than the length of the second terminal docking pin 1322 .

[0061] Exemplarily, the length of each port (A1, A2, A3) in the first terminal interface 1311 and the length of each docking pin (B1, B2, B3) in the first terminal docking pin 1321 can be set to 10 cm; the length of each port (A4, A5) in the second terminal interface 1312 and the length of each docking pin (B4, B5) in the second terminal docking pin 1322 can be set to 5 cm.

[0062] The first terminal interface 1311 and the first terminal docking pin 1321 are used to conduct the first battery circuit 120 and the second battery circuit 140, so that the first battery 121 in the first battery circuit 120 and the second battery 141 in the second battery circuit 140 are connected in parallel to realize the main power conduction of the battery parallel device 10.

[0063] The second terminal interface 1312 and the second terminal docking pin 1322 are used to send the circuit signal output by the second battery circuit 140 to the control circuit 110 to detect the connection status of the docking terminal 130 .

[0064] In this way, the docking terminals of the main power with excessive current are designed as long terminals, that is, each port (A1, A2, A3) in the first terminal interface 1311 and each docking pin (B1, B2, B3) in the first terminal docking pin 1321; and the docking terminals for detecting whether the circuit signal is connected are designed as short terminals, that is, each port (A4, A5) in the second terminal interface 1312 and each docking pin (B4, B5) in the second terminal docking pin 1322. When the docked short terminals (A4 and B4, A5 and B5) are connected, the controller U1 detects that the circuit signal meets the requirements, indicating that the first terminal interface 1311 and the first terminal docking pin 1321 have been reliably and correctly connected. At this time, the main power can be further turned on by controlling S1 to realize the parallel connection of the first battery 121 and the second battery 141, ensuring that the docking terminal 130 has no voltage output when it is not reliably connected, avoiding the risk of electric shock, and thereby improving the reliability of the battery parallel connection.

[0065] In summary, by detecting whether the docking terminal 130 is connected through terminal interfaces (first terminal interface 1311 and second terminal interface 1312) and terminal docking pins (first terminal docking pin 1321 and second terminal docking pin 1322) of different lengths, the docking failure problem caused by inaccurate detection circuit signals of the controller U1 can be avoided, thereby improving the reliability of the parallel connection of the batteries. At the same time, due to the different lengths of the terminal interfaces and the terminal docking pins, the connection status of the docking terminal 130 can be more clearly detected, thereby further improving the reliability of the docking terminal 130.

[0066] Further, such as Figure 2 As shown in , the first battery circuit 120 includes a first battery 121 and a control switch S1.

[0067] The positive electrode of the first battery 121 and the second end of the control switch S1 are respectively connected to the docking terminal 130 ; the negative electrode of the first battery 121 is connected to the first end of the control switch S1 .

[0068] The control switch S1 is used to control whether the charging power (12V) of the control circuit 110 is output to the first battery 121 , and to control whether current flows between the first battery circuit 120 and the second battery circuit 140 .

[0069] Here, the control switch S1 may be a semiconductor power device, such as MOSFET or IGBT.

[0070] In this way, by controlling the on-off control of the switch S1, the on-off control of the main power of the first battery circuit 120 is realized, thereby ensuring the safe and stable operation of the battery management system. Specifically, by controlling the control switch S1, after detecting that the docking terminal 130 is reliably connected, the main power of the first battery circuit 120 is turned on, so that the first battery 121 and the second battery 141 are normally connected in parallel and start working. At the same time, when it is detected that the docking terminal 130 is not connected or the connection is faulty, the control switch S1 can disconnect the main power of the first battery circuit 120 to avoid safety risks caused by unreliable connection.

[0071] Further, such as Figure 2 As shown in , the second battery circuit 140 includes a second battery 141 and a power supply circuit 142 .

[0072] The positive electrode and the negative electrode of the second battery 141 and the positive terminal and the negative terminal of the power supply circuit 142 are respectively connected to the docking terminal 130 .

[0073] The power supply circuit 142 is used to output a circuit signal generated by a power supply (3.3V) in the power supply circuit 142 to the docking terminal 130 .

[0074] The battery parallel device provided in the embodiment of the present application outputs a circuit signal of the second battery circuit to the control circuit through the docking terminal, and the control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, so as to control the port voltage of the docking terminal. When it is determined that the docking terminal is correctly connected, the control switch in the first battery circuit is controlled to be turned on, so that current flows between the first battery in the first battery circuit and the second battery in the second battery circuit, so as to realize parallel connection between the batteries, thereby improving the reliability and safety of the battery parallel connection, and further improving the efficiency of the battery parallel connection.

[0075] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0076] For the convenience of description, the above device is described in terms of functions divided into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0077] Based on the same technical concept, corresponding to any of the above-mentioned embodiment devices, the present application also provides a battery parallel connection method.

[0078] Figure 3 FIG. 1 is a flowchart of an exemplary battery parallel connection method according to an embodiment of the present application. Figure 3 , the battery parallel connection method may include the following steps.

[0079] S301, outputting a circuit signal of the second battery circuit to the control circuit through the docking terminal.

[0080] S302, the control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, controls the control switch in the first battery circuit to be turned on;

[0081] S303: When the control switch is turned on, the docking terminal enables current to flow between the first battery circuit and the second battery circuit, so as to achieve parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit.

[0082] Based on the same technical concept, the present application also provides a battery management system, which includes the battery parallel connection device as described in any of the above embodiments.

[0083] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0084] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0085] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0086] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A battery parallel device, characterized in that: The battery parallel connection device comprises a control circuit, a first battery circuit, a docking terminal and a second battery circuit: The control circuit is connected to the first battery circuit; the control circuit and the first battery circuit are respectively connected to the docking terminal; the docking terminal is connected to the second battery circuit; The control circuit is used to detect the circuit signal output by the second battery circuit through the docking terminal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, control the control switch in the first battery circuit to turn on; The docking terminal is used to output a circuit signal of the second battery circuit to the control circuit, and when the control switch is turned on, current flows between the first battery circuit and the second battery circuit to achieve a parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit.

2. The device according to claim 1, characterized in that The control circuit includes a controller, a first resistor and a second resistor: The first end of the first resistor and the negative end of the controller are connected to the docking terminal; the positive end of the controller is connected to the second end of the first resistor; the collector end of the controller is connected to the first end of the second resistor; the emitter end of the controller is connected to the first battery circuit; the second end of the second resistor is connected to the charging power supply; The controller is used to detect the circuit signal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, control the control switch in the first battery circuit to turn on; The first resistor is used to limit the current input into the controller to prevent damage to the controller caused by overcurrent; The second resistor is used to keep the transistor in the controller at a high potential and in a cut-off state when there is no external signal input to the controller.

3. The device according to claim 2, characterized in that The controller is also used to control the control switch in the first battery circuit to close in response to determining that there is a connection abnormality in the docking terminal, so as to avoid the risk of electric shock caused by the flow of current.

4. The device according to claim 2, characterized in that The controller includes a transistor and a diode: The emitter of the transistor is connected to the first battery circuit; the collector of the transistor is connected to the first end of the second resistor; the base of the transistor is connected to the second end of the first resistor; the positive terminal of the diode is connected to the second end of the first resistor; the negative terminal of the diode is connected to the docking terminal; The transistor is used to control the control switch in the first battery circuit to be turned on based on the judgment result of the controller, and output the charging current of the charging power supply to the first battery circuit when the control switch is turned on; The diode is used to prevent the current input to the controller from flowing in reverse, so as to protect the control circuit.

5. The device according to claim 1, characterized in that The docking terminals include an input terminal block and an output terminal block: The input terminal row is connected to the control circuit and the first battery circuit respectively; the input terminal row is connected to the output terminal row; the output terminal row is connected to the second battery circuit; The input terminal block is used to receive the circuit signal output by the output terminal block to output to the control circuit, and output the current output by the first battery circuit to the output terminal block; The output terminal row is used to receive the circuit signal output by the second battery circuit to output to the input terminal row, and output the current output by the input terminal row to the second battery circuit.

6. The device according to claim 5, characterized in that The input terminal row and the output terminal row are both quick-plug terminals to improve the connection stability of the butt terminals.

7. The device according to claim 5, characterized in that The input terminal row includes a first terminal interface and a second terminal interface, and the output terminal row includes a first terminal docking pin and a second terminal docking pin: The first port and the second port of the first terminal interface are respectively connected to the positive terminal and the negative terminal of the first battery circuit; the third port of the first terminal interface is grounded; the second terminal interface is connected to the control circuit; the first terminal interface is connected to the first terminal docking pin; the first docking pin and the second docking pin of the first terminal docking pin are respectively connected to the positive terminal and the negative terminal of the second battery circuit; the third docking pin of the first terminal docking pin is grounded; the second terminal interface is connected to the second terminal docking pin; the first terminal docking pin and the second terminal docking pin are respectively connected to the second battery circuit; Wherein, the length of the first terminal interface is greater than the length of the second terminal interface, and the length of the first terminal docking pin is greater than the length of the second terminal docking pin; The first terminal interface and the first terminal docking pin are used to conduct the first battery circuit and the second battery circuit, so that the first battery in the first battery circuit and the second battery in the second battery circuit are connected in parallel, so as to realize the main power conduction of the battery parallel device; The second terminal interface and the second terminal docking pin are used to send the circuit signal output by the second battery circuit to the control circuit to detect the connection status of the docking terminal.

8. The device according to claim 1, characterized in that The first battery circuit comprises a first battery and a control switch: The positive electrode of the first battery and the second end of the control switch are respectively connected to the docking terminal; the negative electrode of the first battery is connected to the first end of the control switch; The control switch is used to control whether the charging power of the control circuit is output to the first battery, and to control whether current flows between the first battery circuit and the second battery circuit.

9. The device according to claim 1, characterized in that The second battery circuit includes a second battery and a power supply circuit: The positive electrode and the negative electrode of the second battery and the positive terminal and the negative terminal of the power supply circuit are respectively connected to the docking terminal; The power supply circuit is used to output a circuit signal generated by a power supply in the power supply circuit to the docking terminal.

10. A battery parallel connection method, characterized in that: The method comprises: Outputting a circuit signal of the second battery circuit to the control circuit through the docking terminal; The control circuit detects the circuit signal to determine whether the docking terminal is correctly connected, and in response to determining that the docking terminal is correctly connected, controls the control switch in the first battery circuit to turn on; When the control switch is turned on, the butting terminal allows current to flow between the first battery circuit and the second battery circuit, so as to achieve parallel connection between the first battery in the first battery circuit and the second battery in the second battery circuit.

11. A battery management system, characterized in that: The battery management system includes the battery parallel connection device as described in any one of claims 1 to 9.

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