Output control circuit of a battery system

Abstract

The present application discloses an output control circuit of a battery system, the circuit comprising: a battery control unit, for outputting a first control signal according to the state of the battery system; a temperature control unit, for outputting a second control signal according to the state of the battery system; an emergency stop unit, for outputting an emergency stop signal by manual operation; an output control module, for controlling the on and off of the output terminal of the battery system according to any one of the first control signal and the second control signal, and controlling the disconnection of the output terminal of the battery system according to the emergency stop signal; when the battery system is normal, the output control module controls the conduction of the output terminal of the battery system; when the battery system is abnormal, the output control module controls the disconnection of the output terminal of the battery system. In the output control circuit of the battery system of the present application, the battery control unit, the temperature control unit and the emergency stop unit independently control the output terminal of the battery system through the output control module, which greatly expands the emergency stop control scheme of the output terminal of the battery system.

Description

Technical Field

[0001] The present application relates to the technical field of battery system control, and in particular to an output control circuit of a battery system. Background Art

[0002] Battery systems are widely used in various industries, such as energy storage, new energy and other fields that require battery power supply. The output control of traditional battery systems is to directly control the on and off of output relays through the BMS (Battery Management System) output control signal. The emergency stop control of the battery system is also through closing the emergency stop switch, thereby outputting the emergency stop signal to the BMS of the battery system, and then the BMS outputs a control signal to directly control the output relay to disconnect. Specifically, the output relay is controlled by the BCU (Battery Control Unit, BCU) belonging to the BMS outputting a control signal to control the on and off of the output relay.

[0003] The problem with traditional battery systems is that the output relays can only be controlled by the BCU, which is too simple a control method. In addition, software control such as the BCU also has the risk of software failure, which in turn leads to failure of the output relay control. Summary of the invention

[0004] In view of the above problems, the present application provides an output control circuit of a battery system to solve the above technical problems.

[0005] In a first aspect, the present application provides an output control circuit of a battery system, comprising:

[0006] A battery control unit, configured to output a first control signal according to a state of the battery system;

[0007] a temperature control unit, configured to output a second control signal according to a state of the battery system;

[0008] Emergency stop unit, used to output emergency stop signal by manual operation;

[0009] An output control module, used to control the on and off of the output terminal of the battery system according to any one of the first control signal and the second control signal, and to control the disconnection of the output terminal of the battery system according to the emergency stop signal;

[0010] The status of the battery system includes a normal battery system and an abnormal battery system. When the battery system is normal, the output control module controls the output end of the battery system to be turned on; when the battery system is abnormal, the output control module controls the output end of the battery system to be turned off.

[0011] In some embodiments, in the output control circuit of the battery system provided by the present application, the output control module includes:

[0012] A first output control unit, connected to the battery control unit, to control the on and off of the output end of the battery system according to a first control signal;

[0013] The second output control unit is connected to the temperature control unit and the emergency stop unit to drive the first output control unit to control the on and off of the output end of the battery system according to the second control signal, and to drive the first output control unit to control the disconnection of the output end of the battery system according to the emergency stop signal.

[0014] In some embodiments, in the output control circuit of the battery system provided in the present application, the first output control unit includes:

[0015] A first relay, the normally closed end of which is connected to the battery control unit, the common end of which is connected to the negative relay at the output end of the battery system, and the two ends of the coil are respectively connected to the positive power supply and the second output control unit;

[0016] A second relay, the normally closed end of which is connected to the battery control unit, the common end of which is connected to the positive relay at the output end of the battery system, and the two ends of the coil are respectively connected to the positive power supply and the second output control unit;

[0017] The second output control unit comprises:

[0018] The third relay has a normally closed end connected to the temperature control unit, a normally open end connected to the negative power supply, a common end connected to the first relay, and two ends of the coil connected to the emergency stop unit and the ground respectively;

[0019] The fourth relay has a normally closed end connected to the temperature control unit, a normally open end connected to the negative power supply, a common end connected to the second relay, and two ends of the coil are respectively connected to the emergency stop unit and the ground.

[0020] In some embodiments, in the output control circuit of the battery system provided by the present application, the emergency stop unit includes:

[0021] A first normally open switch is arranged close to the battery system, one end of which is connected to the power supply, and the other end of which is connected to the output control module;

[0022] The second normally open switch is arranged far away from the battery system, one end of which is connected to the power supply, and the other end of which is connected to the output control module.

[0023] In some embodiments, in the output control circuit of the battery system provided in the present application, the first normally open switch is a double normally open contact switch, and the remaining two ends of the first normally open switch are connected to the battery control unit to form a loop with the battery control unit to output an emergency stop signal when closed. The battery control unit drives the output control module to control the output end of the battery system to disconnect according to the emergency stop signal.

[0024] In some embodiments, in the output control circuit of the battery system provided by the present application, the emergency stop unit further includes:

[0025] A first diode, with an anode connected to the first normally open switch and a cathode connected to the output control module;

[0026] The second diode has an anode connected to the second normally open switch and a cathode connected to the output control module.

[0027] In some embodiments, in the output control circuit of the battery system provided in the present application, the battery control unit outputs a first control signal when the battery system is normal, and stops outputting the first control signal when the battery system is abnormal; the temperature control unit outputs a second control signal when the battery system is abnormal, and stops outputting the second control signal when the battery system is normal.

[0028] In some embodiments, the output control circuit of the battery system provided by the present application further includes:

[0029] The DC converter has input ends connected to the power supply and the ground respectively, and is used to convert the power supply voltage into the positive voltage and the negative voltage of the power supply to provide them to the battery control unit, the temperature control unit and the output control module.

[0030] The output control circuit of the battery system provided in the present application, the output control module independently implements the on-off control of the output end of the battery system according to the first control signal output by the battery control unit (BCU), the second control signal output by the temperature control unit (TCU) and the emergency stop signal output by the emergency stop unit, thereby expanding the emergency stop control scheme of the output end of the battery system and improving the safety and stability of the battery system.

[0031] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A module schematic diagram of an output control circuit of a battery system provided in an embodiment of the present application is shown.

[0034] Figure 2 Another module schematic diagram of the output control circuit of the battery system provided in an embodiment of the present application is shown.

[0035] Figure 3A schematic diagram of the structure of an output control circuit of a battery system provided in an embodiment of the present application is shown.

[0036] Figure 4 Another structural schematic diagram of the output control circuit of the battery system provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0038] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0039] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0040] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0041] The present application embodiment provides an output control circuit of a battery system. Figure 1 The module schematic diagram of the output control circuit of the battery system provided by the embodiment of the present application is shown as follows: Figure 1 As shown, the output control circuit of the battery system includes a battery control unit (BCU) 100 , a temperature control unit (TCU) 200 , an emergency stop unit 300 and an output control module 400 .

[0042] The battery control unit 100 is used to output a first control signal according to the state of the battery system. Optionally, for the battery system, the battery control unit 100 has a self-detection function after power-on, which is usually used to detect some operating conditions of the BMS and can output a first control signal according to whether a fault is detected in the battery system.

[0043] The temperature control unit 200 is used to output a second control signal according to the state of the battery system. Optionally, for the battery system, the temperature control unit 200 also has a self-detection function after power-on, and is usually used to detect the battery temperature, voltage, etc. of the battery system, and can output a second control signal based on whether a fault is detected.

[0044] The emergency stop unit 300 is used to output an emergency stop signal by manual operation. Optionally, in some scenarios where an emergency stop is required, the output end of the battery system is disconnected by manually controlling the emergency stop unit.

[0045] The output control module 400 is used to control the on / off of the output terminal of the battery system according to any one of the first control signal and the second control signal, and to control the disconnection of the output terminal of the battery system according to the emergency stop signal.

[0046] In some embodiments, when the battery control unit 100 self-detects and finds no errors, it outputs a first control signal to the output control module 400 to make the output end of the battery system normally conductive. When the battery control unit 100 self-detects and finds a fault, it stops outputting the first control signal, thereby disconnecting the output end of the battery system.

[0047] In some embodiments, when the temperature control unit 200 self-detects and finds no error, it does not output the second control signal. At this time, the output end of the battery system is turned on and operates according to the first control signal output by the battery control unit 100. When the temperature control unit 200 self-detects and finds a fault, or the battery control unit 100 fails, the temperature control unit 200 outputs the second control signal to the output control module 400 to disconnect the output end of the battery system.

[0048] Among them, the status of the battery system includes a normal battery system and an abnormal battery system, that is, for the battery control unit 100 and the temperature control unit 200, the battery system is considered to be normal after the self-detection is correct, otherwise it is considered to be abnormal. If the battery system is normal, the output control module 400 controls the output end of the battery system to be turned on, and the battery system is in a normal working state at this time; if the battery system is abnormal, the output control module 400 controls the output end of the battery system to be disconnected, and the battery system is in a state of being disconnected by the battery control unit 100 or the temperature control unit 200.

[0049] It can be understood that the battery control unit (BCU) and the temperature control unit (TCU) belong to two different modules of the battery system, which are used to perform different functions. The detection items for the battery system and the means of determining whether the corresponding detection items are normal can be customized, so the embodiments of the present application will not be repeated here.

[0050] The output control circuit of the battery system provided in the embodiment of the present application, the battery control unit, the temperature control unit and the emergency stop unit are independently arranged, and the output control module can control the output end of the battery system according to different signals, thereby realizing the independent control of the output end of the battery system by the battery control unit, the temperature control unit and the emergency stop unit. Compared with the traditional battery system that controls the output end of the battery system through the BMS, the output control circuit of the battery system provided in the embodiment of the present application expands the emergency stop control scheme of the output end of the battery system, and further improves the safety and stability of the battery system.

[0051] In some embodiments, Figure 2 Another module schematic diagram of the output control circuit of the battery system provided in the embodiment of the present application is shown, such as Figure 2 As shown, in the output control circuit of the battery system provided in the embodiment of the present application, the output control module 400 includes a first output control unit 410 and a second output control unit 420 .

[0052] The first output control unit 410 is connected to the battery control unit 100 , so as to control the on and off of the output terminal of the battery system according to the first control signal.

[0053] In some embodiments, after the battery control unit 100 self-detects and finds no errors, it outputs a first control signal to the first output control unit 410 to make the output end of the battery system normally turned on. When the battery control unit 100 self-detects and finds a fault, it stops outputting the first control signal. The first output control unit does not receive the first control signal, thereby disconnecting the output end of the battery system.

[0054] The second output control unit 420 is connected to the temperature control unit 200 and the emergency stop unit 300 to drive the first output control unit 410 to control the on and off of the battery system output terminal according to the second control signal, and to drive the first output control unit 410 to control the disconnection of the battery system output terminal according to the emergency stop signal.

[0055] In some embodiments, when the temperature control unit 200 self-detects and finds no error, it does not output the second control signal. At this time, the output end of the battery system is turned on and operated according to the first control signal output by the battery control unit 100. When the temperature control unit 200 self-detects and finds a fault, or the battery control unit 100 fails, the temperature control unit 200 outputs a second control signal to the second output control unit 420, and the second control unit 420 drives the first output control unit 410 to disconnect the output end of the battery system. Similarly, when the second output control unit 420 receives an emergency stop signal, it will also drive the first output control unit 410 to disconnect the output end of the battery system.

[0056] In the output control circuit of the battery system provided in the embodiment of the present application, the battery control unit controls the on-off of the output terminal of the battery system by controlling the first output control unit, and the temperature control unit and the emergency stop unit control the first output control unit by the second output control unit, thereby indirectly controlling the on-off of the output terminal of the battery system. The embodiment of the present application thus realizes that the battery control unit, the temperature control unit and the emergency stop unit independently control the output terminal of the battery system, expands the emergency stop control scheme of the output terminal of the battery system, and further improves the safety and stability of the battery system.

[0057] In some embodiments, Figure 3 The structure diagram of the output control circuit of the battery system provided in the embodiment of the present application is shown as follows: Figure 3 As shown, in the output control circuit of the battery system provided in the embodiment of the present application, the first output control unit includes a first relay U1 and a second relay U2.

[0058] The normally closed end (4) of the first relay U1 is connected to the output end (BCU-OUT2-) of the battery control unit 100, the common end (3) is connected to the negative relay of the battery system output end, the normally open end (5) is not connected, and the two ends (1 and 2) of the coil are respectively connected to the positive power supply (DC+) and the second output control unit 420.

[0059] The normally closed end (4) of the second relay U2 is connected to the output end (BCU-OUT1-) of the battery control unit 100, the common end (3) is connected to the positive relay at the output end of the battery system, the normally open end (5) is not connected, and the two ends (1 and 2) of the coil are respectively connected to the positive power supply (DC+) and the second output control unit 420.

[0060] The second output control unit includes a third relay U3 and a fourth relay U4.

[0061] The normally closed end (4) of the third relay U3 is connected to the output end (TCU-OUT2-) of the temperature control unit, the normally open end (5) is connected to the negative power supply (DC-), the common end (3) is connected to the coil (2) of the first relay U1, and the two ends (1 and 2) of the coil are respectively connected to the emergency stop unit 300 and the ground (GND).

[0062] The normally closed end (4) of the fourth relay U4 is connected to the output end (TCU-OUT1) of the temperature control unit, the normally open end (5) is connected to the negative power supply (DC-), the common end (3) is connected to the coil (2) of the second relay U2, and the two ends (1 and 2) of the coil are respectively connected to the emergency stop unit 300 and the ground (GND).

[0063] In the output control circuit of the battery system provided in the embodiment of the present application, after power-on, the battery control unit 100 and the temperature control unit 200 work normally. After detecting that there is no fault, the output end (BCU-OUT1- and BCU-OUT2-) of the battery control unit 100 respectively outputs two first control signals to the second relay U2 and the first relay U1 to respectively control the positive level relay and the negative relay at the output end of the battery system to close, and at this time, the output end of the battery system outputs DC high voltage electricity. When the battery control unit 100 detects a fault, its output end (BCU-OUT1- and BCU-OUT2-) stops outputting, so that the positive relay and the negative relay at the output end of the battery system are disconnected. If the battery control unit 100 does not detect a fault or failure, but the temperature control unit 200 detects a fault, the output end (TCU-OUT1- and TCU-OUT2-) of the temperature control unit 200 outputs a second control signal to the normally closed end (4) of the fourth relay U4 and the normally closed end (4) of the third relay U3, respectively, and the third relay U3 and the fourth relay U4 are turned on, so that the coils of the first relay U1 and the second relay U2 are energized, respectively, and then the first relay U1 and the second relay U2 are switched to the normally open end (5) because the coils are energized, and the normally open ends (5) of the first relay U1 and the second relay U2 are not connected, so the first relay U1 and the second relay U2 are disconnected, thereby achieving the disconnection of the positive relay and the negative relay at the output end of the battery system. When the battery control unit 100 and the temperature control unit 200 detect no abnormality or both fail, and manual operation is required to disconnect the battery system urgently, the emergency stop unit outputs an emergency stop signal to the coils of the third relay U3 and the fourth relay U4, thereby turning on the normally open ends (5) of the third relay U3 and the fourth relay U4, and then energizing the coils of the first relay U1 and the second relay U2 and switching to their normally open ends (5), thereby disconnecting the first relay U1 and the second relay U2, and disconnecting the positive relay and the negative relay at the output end of the battery system.

[0064] It can be understood that, in the embodiment of the present application, the first control signal, the second control signal and the emergency stop signal are electrical signals used to supply power to the relay.

[0065] The output control circuit of the battery system provided in the embodiment of the present application, the battery control unit, the temperature control unit and the emergency stop unit respectively control the output end of the battery system through relays, so that different modules are respectively controlled through the hard-wired battery system output end, and each module is independent of each other. Compared with the traditional battery system that controls the output end of the battery system through BMS software, the embodiment of the present application expands the emergency stop control scheme of the battery system output end, and further improves the safety and stability of the battery system.

[0066] In some embodiments, Figure 3 As shown, in the output control circuit of the battery system provided in the embodiment of the present application, the emergency stop unit 300 includes a first normally open switch 310 and a second normally open switch 320 .

[0067] The first normally open switch 310 is disposed close to the battery system, with one end connected to the power supply and the other end connected to the output control module 400 , namely, connected to the coil ( 1 ) of the third relay U3 and the fourth relay U4 .

[0068] The second normally open switch 320 is disposed away from the battery system, with one end connected to the power supply and the other end connected to the output control module 400 , namely, connected to the coil ( 1 ) of the third relay U3 and the fourth relay U4 .

[0069] The output control circuit of the battery system provided in the embodiment of the present application can achieve an emergency stop near the battery system through the first normally open switch 310, and can achieve an emergency stop far away from the battery system through the second normally open switch 320, thereby expanding the emergency stop solution of the battery system.

[0070] In some embodiments, the output control circuit of the battery system of the embodiment of the present application is characterized in that the first normally open switch 310 is a double normally open contact switch, and the remaining two ends of the first normally open switch 310 are connected to the battery control unit 100, so that the first normally open switch 310 can form a loop with the battery control unit when closed, thereby outputting an emergency stop signal to the battery control unit 100, and the battery control unit stops outputting the first control signal according to the emergency stop signal, thereby driving the output control module 400 to control the output end of the battery system to disconnect.

[0071] In some embodiments, Figure 4 Another structural schematic diagram of the output control circuit of the battery system provided in the embodiment of the present application is shown. Figure 4 As shown, in the output control circuit of the battery system provided in the embodiment of the present application, the emergency stop unit 400 further includes a first diode D1 and a second diode D2.

[0072] The positive electrode of the first diode D1 is connected to the first normally open switch 310, and the negative electrode is connected to the output control module 400, that is, connected to the coil (1) of the third relay U3 and the fourth relay U4; the positive electrode of the second diode D2 is connected to the second normally open switch 320, and the negative electrode is connected to the output control module 400, the coil (1) of the third relay U3 and the fourth relay U4.

[0073] In some embodiments, Figure 3 and Figure 4 As shown, the output control circuit of the battery system provided in the embodiment of the present application also includes a direct current converter (DCDC), the input ends of which are respectively connected to the power supply and the ground, for filtering and stabilizing the power supply voltage, and converting it into a positive power supply voltage and a negative power supply voltage to provide to the battery control unit 100, the temperature control unit 200 and the output control module 400.

[0074] It can be understood that in the embodiment of the present application, the direct current converter (DCDC) is not a necessary circuit module. In fact, the output control circuit of the battery system provided in the embodiment of the present application, the positive voltage and negative voltage received by the battery control unit 100, the temperature control unit 200 and the output control module 400 can also come directly from the power supply.

[0075] The output control circuit of the battery system provided in the embodiment of the present application, the battery control unit, the temperature control unit and the emergency stop unit respectively control the output end of the battery system through relays, thereby realizing that different independent modules control the output end of the battery system through hard lines. Compared with the traditional battery system that controls the output end of the battery system through software through BMS, the embodiment of the present application expands the emergency stop control scheme of the output end of the battery system, further improving the safety and stability of the battery system.

[0076] The above contents are further detailed descriptions of the present application in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be regarded as the protection scope of the present application.

Claims

1. An output control circuit of a battery system, characterized in that: include: A battery control unit, configured to output a first control signal according to a state of the battery system; a temperature control unit, configured to output a second control signal according to a state of the battery system; Emergency stop unit, used to output emergency stop signal by manual operation; An output control module, used to control the on / off of the output terminal of the battery system according to any one of the first control signal and the second control signal, and to control the disconnection of the output terminal of the battery system according to the emergency stop signal; The state of the battery system includes a normal battery system and an abnormal battery system. If the battery system is normal, the output control module controls the output end of the battery system to be turned on; if the battery system is abnormal, the output control module controls the output end of the battery system to be turned off; The output control module comprises: A first output control unit, connected to the battery control unit, to control the on and off of the output end of the battery system according to the first control signal; a second output control unit, connected to the temperature control unit and the emergency stop unit, to drive the first output control unit to control the on and off of the output terminal of the battery system according to the second control signal, and to drive the first output control unit to control the disconnection of the output terminal of the battery system according to the emergency stop signal; The first output control unit comprises: A first relay, a normally closed end connected to the battery control unit, a common end connected to a negative relay at the output end of the battery system, and two ends of the coil connected to a positive power supply and the second output control unit, respectively; A second relay, a normally closed end of which is connected to the battery control unit, a common end of which is connected to a positive relay at the output end of the battery system, and two ends of a coil of which are respectively connected to the positive power supply and the second output control unit; The second output control unit comprises: A third relay, wherein a normally closed end is connected to the temperature control unit, a normally open end is connected to the negative power supply, a common end is connected to the first relay, and two ends of the coil are respectively connected to the emergency stop unit and the ground; The fourth relay has a normally closed end connected to the temperature control unit, a normally open end connected to the negative power supply, a common end connected to the second relay, and two ends of the coil are respectively connected to the emergency stop unit and the ground.

2. The output control circuit of the battery system according to claim 1, characterized in that: The emergency stop unit comprises: A first normally open switch, disposed close to the battery system, with one end connected to the power supply and the other end connected to the output control module; The second normally open switch is arranged far away from the battery system, one end of which is connected to the power source, and the other end of which is connected to the output control module.

3. The output control circuit of the battery system according to claim 2, characterized in that: The first normally open switch is a double normally open contact switch, and the remaining two ends of the first normally open switch are connected to the battery control unit to form a loop with the battery control unit to output an emergency stop signal when closed. The battery control unit drives the output control module to control the output end of the battery system to be disconnected according to the emergency stop signal.

4. The output control circuit of the battery system according to claim 2, characterized in that: The emergency stop unit also includes: A first diode, with an anode connected to the first normally open switch and a cathode connected to the output control module; The second diode has an anode connected to the second normally open switch and a cathode connected to the output control module.

5. The output control circuit of the battery system according to claim 1, characterized in that: The battery control unit outputs the first control signal when the battery system is normal, and stops outputting the first control signal when the battery system is abnormal; the temperature control unit outputs the second control signal when the battery system is abnormal, and stops outputting the second control signal when the battery system is normal.

6. The output control circuit of the battery system according to claim 1, characterized in that: Also includes: A DC converter, whose input ends are respectively connected to a power supply and a ground, is used to convert the power supply voltage into a positive power supply voltage and a negative power supply voltage to provide the voltage to the battery control unit, the temperature control unit and the output control module.

Images