Battery management system, single-board computer chip and battery pack

Abstract

The utility model provides a battery management system, a single board computer chip and a battery pack, the battery management system comprises a time delay unit, a logic unit and a driving unit, the time delay unit is used for outputting a time delay signal with a preset duration when a control unit satisfies a first condition; the logic unit is respectively connected with the delay unit and the control unit and is used for receiving a control signal provided by the control unit and a delay signal provided by the delay unit and generating a driving signal; and the driving unit is used for controlling the working state of the driving unit according to the driving signal, and the working state comprises connection or disconnection. Therefore, the situation that the driving signal is suddenly disconnected when the control unit is reset can be avoided, and the running safety of the electric automobile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery management system, a single-board computer chip and a battery pack. Background Art

[0002] Relays are the most important actuators in the battery management system (BMS) of electric vehicles. Relays act as switches to control the on and off of high-voltage circuits, and their reliability is related to the safety of the entire vehicle.

[0003] However, if the microcontroller unit (MCU) connected to the relay is abnormally reset during the operation of the electric vehicle, the signal output by the microcontroller unit will also be interrupted, causing the relay to immediately change from a closed state to an open state, thereby cutting off the high-voltage circuit, causing the vehicle to be in an uncontrollable state and easily causing an accident. Summary of the invention

[0004] The utility model mainly provides a battery management system, a single-board computer chip and a battery pack, which can avoid the situation where a driving signal is suddenly disconnected when a control unit is reset, thereby improving the safety of electric vehicle operation.

[0005] The technical solution of the utility model is achieved in this way:

[0006] In a first aspect, an embodiment of the utility model provides a battery management system, the battery management system includes a delay unit, a logic unit and a drive unit, wherein:

[0007] A delay unit, configured to output a delay signal having a preset duration when the control unit meets a first condition;

[0008] The logic unit is connected to the delay unit and the control unit respectively, and is used to receive the control signal provided by the control unit and the delay signal provided by the delay unit, and generate a driving signal;

[0009] The driving unit is used to control the working state of the driving unit according to the driving signal, wherein the working state includes on or off.

[0010] Through the above technical means, when the control unit meets the first condition, the delay unit outputs a delay signal to the logic unit, so that the logic unit can generate a drive signal according to the delay signal and continue to output it to the drive unit. This avoids the situation where the drive signal is suddenly disconnected when the control unit is reset, continues to maintain the state of the relay, and improves the safety of the operation of the electric vehicle.

[0011] In some embodiments, the logic unit includes a first logic circuit, and the driving unit includes a high-side driving unit, wherein: a first input end of the first logic circuit is connected to an output end of the delay unit, a second input end of the first logic circuit is connected to an output end of the control unit, and an output end of the first logic circuit is connected to the high-side driving unit, for receiving a first control signal provided by the control unit and a first delay signal provided by the delay unit, and generating a first driving signal; the high-side driving unit is used to control a working state of the high-side driving unit according to the first driving signal.

[0012] Through the above technical means, when the control unit is reset, the high-side drive unit is controlled by setting the delay unit and the first logic circuit to avoid the negative impact of sudden changes in the state of the control unit on the relay, thereby improving the stability of the battery management system and the safety of driving.

[0013] In some embodiments, the logic unit includes a second logic circuit, and the driving unit includes a low-side driving unit, wherein: a first input end of the second logic circuit is connected to an output end of the delay unit, a second input end of the second logic circuit is connected to an output end of the control unit, and an output end of the second logic circuit is connected to the low-side driving unit, for receiving a second control signal provided by the control unit and a second delay signal provided by the delay unit, and generating a second driving signal; the low-side driving unit is used to control a working state of the low-side driving unit according to the second driving signal.

[0014] Through the above technical means, when the control unit is reset, the low-side drive unit is controlled by setting a delay unit and a second logic circuit to avoid the negative impact of sudden changes in the state of the control unit on the relay, thereby improving the stability of the battery management system and the safety of driving.

[0015] In some embodiments, the logic unit includes a first logic circuit and a second logic circuit, and the driving unit includes a high-side driving unit and a low-side driving unit, wherein: the first input end of the first logic circuit is connected to the second output end of the delay unit, the second input end of the first logic circuit is connected to the first output end of the control unit, and the output end of the first logic circuit is connected to the high-side driving unit, for receiving a first control signal provided by the control unit and a first delay signal provided by the delay unit, and performing logic operations on the first control signal and the first delay signal to generate a first driving signal; the first input end of the second logic circuit is connected to the first output end of the delay unit, the second input end of the second logic circuit is connected to the second output end of the control unit, and the output end of the second logic circuit is connected to the low-side driving unit, for receiving a second control signal provided by the control unit and a second delay signal provided by the delay unit, and performing logic operations on the second control signal and the second delay signal to generate a second driving signal.

[0016] Through the above-mentioned technical means, from the perspective of functional safety, the high-side and low-side drive units can be used together in the driving relay circuit. When the control unit is reset, the high / low-side drive unit is controlled by setting a delay unit, a first logic circuit and a second logic circuit, so that the relay will not be accidentally disconnected and cause the power of the entire vehicle to be disconnected, thereby improving the stability of the battery management system and the safety of driving.

[0017] In some embodiments, the battery management system also includes a pull-up circuit, wherein: the pull-up circuit is respectively connected to the second output terminal of the control unit and the second input terminal of the second logic circuit, and is used to pull up the second control signal to the first level when the second control signal output from the second output terminal of the control unit is a second level; wherein the second level is the reverse level of the first level.

[0018] Through the above technical means, by setting the pull-up circuit, the second logic circuit can still output the second drive signal of the first level when the second control signal output by the control unit is switched to the second level, thereby avoiding the situation where the low-side drive unit is suddenly powered off.

[0019] In some embodiments, the delay unit is used to output a first delay signal having a first preset duration when the control unit is reset, and the signal is at a first level within the first preset duration; the first logic circuit is used to perform a logic operation on the first control signal and the first delay signal, and output a first drive signal at a first level within the first preset duration to control the high-side drive unit to remain turned on.

[0020] Through the above-mentioned technical means, when the control unit is reset, the first delay signal is output so that the high-side drive unit maintains the state before reset within the first preset time period, thereby avoiding the negative impact of sudden changes in the state of the control unit on the relay, thereby improving the stability of the battery management system and driving safety.

[0021] In some embodiments, the delay unit is used to output a second delay signal having a second preset time length when the control unit is reset, and is at a first level within the second preset time length; the second logic circuit is used to perform logical operations on the second control signal and the second delay signal, and output a second drive signal at the first level within the second preset time length to control the low-side drive unit to remain turned on.

[0022] Through the above-mentioned technical means, when the control unit is reset, the second delay signal is output to keep the low-side drive unit in the state before reset within the second preset time period, thereby avoiding the negative impact of sudden changes in the state of the control unit on the relay, thereby improving the stability of the battery management system and driving safety.

[0023] In some embodiments, the delay unit is used to output a first delay signal having a first preset time length and being at a first level within the first preset time length when the control unit is reset; and output a second delay signal having a second preset time length and being at a first level within the second preset time length; the first logic circuit is used to perform logic operations on the first control signal and the first delay signal, and output a first drive signal at the first level within the first preset time length to control the high-side drive unit to remain turned on; the second logic circuit is used to perform logic operations on the second control signal and the second delay signal, and output a second drive signal at the first level within the second preset time length to control the low-side drive unit to remain turned on.

[0024] Through the above-mentioned technical means, when the control unit is reset, the high-side drive unit maintains the state before reset within the first preset time period by outputting the first delay signal; and the low-side drive unit maintains the state before reset within the second preset time period by outputting the second delay signal, thereby avoiding the negative impact of sudden changes in the state of the control unit on the relay, thereby improving the stability of the battery management system and the safety of driving.

[0025] In some embodiments, the delay unit is used to output a first delay signal having a third preset time length when the control unit is powered off, and the first delay signal is at a first level within the third preset time length; the first logic circuit is used to perform logical operations on the first control signal and the first delay signal, output a first drive signal at a first level within the third preset time length to control the high-side drive unit to remain turned on, and output a first drive signal at a second level after the third preset time length to turn off the high-side drive unit.

[0026] Through the above-mentioned technical means, when the control unit is powered off, the delay unit outputs a first delay signal having a third preset time length to the first logic circuit, so that the high-side drive unit is turned off after the third preset time length after the control unit is powered off. This delayed shutdown method can protect the components of the electric vehicle, extend its life, reduce the failure rate of the vehicle, and improve the stability of the battery management system.

[0027] In some embodiments, the delay unit is used to output a second delay signal having a fourth preset time length when the control unit is powered off, and the second delay signal is at the first level within the fourth preset time length; the second logic circuit is used to perform logical operations on the second control signal and the second delay signal, output a second drive signal at the first level within the fourth preset time length to control the low-side drive unit to remain turned on, and output a second drive signal at the second level after the fourth preset time length to turn off the low-side drive unit.

[0028] Through the above-mentioned technical means, when the control unit is powered off, the delay unit outputs a second delay signal with a fourth preset time length to the second logic circuit, so that the low-side drive unit is turned off after the fourth preset time length after the control unit is powered off. This delayed shutdown method can protect the components of the electric vehicle, extend its life, and reduce the failure rate of the vehicle.

[0029] In some embodiments, the delay unit is used to output a first delay signal having a third preset time length and being at a first level within the third preset time length when the control unit is powered off; and output a second delay signal having a fourth preset time length and being at a first level within the fourth preset time length; the first logic circuit is used to perform logic operations on the first control signal and the first delay signal, output a first drive signal at the first level within the third preset time length to control the high-side drive unit to remain turned on, and output the first drive signal at the second level after the third preset time length to turn off the high-side drive unit; the second logic circuit is used to perform logic operations on the second control signal and the second delay signal, output a second drive signal at the first level within the fourth preset time length to control the low-side drive unit to remain turned on, and output the second drive signal at the second level after the fourth preset time length to turn off the low-side drive unit.

[0030] Through the above-mentioned technical means, when the control unit is powered off, the delay unit outputs a first delay signal with a third preset time length to the first logic circuit, so that the high-side drive unit is turned off after the third preset time length after the control unit is powered off, and the delay unit outputs a second delay signal with a fourth preset time length to the second logic circuit, so that the low-side drive unit is turned off after the fourth preset time length after the control unit is powered off. This delayed shutdown method can protect the components of the electric vehicle, extend its service life, and reduce the failure rate of the vehicle.

[0031] In some embodiments, when the third preset time length is equal to the fourth preset time length, the high-side driving unit and the low-side driving unit are turned off at the same time; when the third preset time length is greater than the fourth preset time length, the low-side driving unit is turned off earlier than the high-side driving unit; when the third preset time length is less than the fourth preset time length, the high-side driving unit is turned off earlier than the low-side driving unit.

[0032] By means of the above technical means, the off time of the high-side driving unit and the low-side driving unit is configured, thereby controlling the off sequence of the high-side driving unit and the low-side driving unit to protect the components of the battery management system.

[0033] In some embodiments, the battery management system further includes a high-side freewheeling circuit, wherein: the high-side driving unit is further used to control the energy of the relay to be released through the high-side freewheeling circuit when the high-side driving unit is turned off.

[0034] Through the above-mentioned technical means, when the control unit is powered off, the delay unit outputs a first delay signal with a third preset time length to the first logic circuit, so that the energy of the relay is released through the high-side freewheeling circuit. This delayed shutdown method can protect the components of the electric vehicle, extend its life, reduce the failure rate of the vehicle, and improve the stability of the battery management system.

[0035] In some embodiments, the battery management system further includes a low-side freewheeling circuit, wherein: the low-side driving unit is further used to control the energy of the relay to be released through the low-side freewheeling circuit when the low-side driving unit is turned off.

[0036] Through the above-mentioned technical means, when the control unit is powered off, the delay unit outputs a second delay signal with a fourth preset time length to the second logic circuit, and releases the energy of the relay through the low-side freewheeling circuit. This delayed shutdown method can protect the components of the electric vehicle, extend its life, and reduce the failure rate of the vehicle.

[0037] In some embodiments, the battery management system also includes a high-side freewheeling circuit and a low-side freewheeling circuit, wherein: the drive unit is also used to control the release of energy of the relay through the high-side freewheeling circuit and the low-side freewheeling circuit when the high-side drive unit and the low-side drive unit are turned off at the same time; the drive unit is also used to control the release of energy of the relay through the high-side freewheeling circuit when the high-side drive unit is turned off earlier than the low-side drive unit; the drive unit is also used to control the release of energy of the relay through the low-side freewheeling circuit when the low-side drive unit is turned off earlier than the high-side drive unit.

[0038] Through the above technical means, by configuring the duration of the first delay signal and the second delay signal, the disconnection order of the high-side drive unit and the low-side drive unit is controlled, and then the energy is automatically selected to be released from the high-side freewheeling or the low-side freewheeling when the relay is disconnected, thereby protecting the components of the electric vehicle, extending its service life, and reducing the failure rate of the vehicle.

[0039] In some embodiments, the high-side freewheeling circuit includes a first breakdown diode and a first diode, and the low-side freewheeling circuit includes a second breakdown diode, wherein: the first end of the high-side driving unit is connected to the first power supply, the second end of the high-side driving unit is respectively connected to the first end of the relay and the second end of the first breakdown diode, the first end of the first breakdown diode is connected to the first end of the first diode, and the second end of the first diode is connected to the second end of the relay; the second end of the relay is also respectively connected to the first end of the low-side driving unit and the first end of the second breakdown diode, the second end of the second breakdown diode is connected to the second end of the low-side driving unit, and the second end of the low-side driving unit is grounded.

[0040] Through the above-mentioned technical means, based on the high-side freewheeling circuit and / or the low-side freewheeling circuit, the energy of the relay can be consumed in the loop in a freewheeling manner, protecting components from being penetrated or burned by excessive voltage, thereby improving the safety of the battery management system.

[0041] In some embodiments, the first logic circuit has an OR logic operation function, and the second logic circuit has an AND logic operation function.

[0042] Through the above technical means, when the control unit is reset or powered off, an OR operation is performed through the first logic circuit and an AND operation is performed through the second logic circuit to ensure that the first drive signal and the second drive signal are output normally, thereby avoiding the sudden disconnection of the relay.

[0043] In some embodiments, the first logic circuit is used to output a first drive signal at a first level when the first control signal is at a first level, or the first delay signal is at a first level; or, the first logic circuit is used to output a first drive signal at a second level when the first control signal is at a second level and the first delay signal is at a second level; wherein the second level is a reverse level of the first level, and the high-side drive unit is used to turn on when receiving the first drive signal at the first level; and turn off when receiving the first drive signal at the second level.

[0044] Through the above technical means, the flexibility of the battery management system control is improved by flexibly configuring the high and low levels of the first control signal and the first delay signal.

[0045] In some embodiments, the second logic circuit is used to output a second drive signal at the first level when the second control signal is at the first level and the second delay signal is at the first level; or, the second logic circuit is used to output a second drive signal at the second level when the second control signal is at the second level or the second delay signal is at the second level; wherein the second level is the reverse level of the first level, and the low-side drive unit is used to turn on when receiving the second drive signal at the first level; and turn off when receiving the second drive signal at the second level.

[0046] Through the above technical means and by flexibly configuring the first logic unit and the second logic unit, the flexibility of the battery management system control is improved.

[0047] In some embodiments, the delay unit is integrated on a single board computer chip (Single Board Computer Chip, SBC).

[0048] Through the above technical means, by integrating the delay unit in the SBC, the circuit is made simpler, the interference of the peripheral circuit is reduced, and the cost is saved.

[0049] In some embodiments, the battery management system further includes a relay, wherein: the relay is connected to the drive unit and is used to control the conduction or disconnection of the relay according to the working state of the drive unit.

[0050] By using the above technical means, the delay unit is integrated into the SBC, which can simplify the circuit. While achieving relay retention, the order of disconnection of the high-side drive unit and the low-side drive unit can be controlled by the logic unit and the delay unit. The freewheeling circuit of the relay disconnection can be selected from the high side or the low side by configuring the delay time.

[0051] In a second aspect, an embodiment of the utility model provides a single-board computer chip, on which a delay unit as described in any one of the first aspects is integrated, wherein:

[0052] The delay unit is used to output a delay signal with a preset duration to the logic unit when the control unit meets the first condition.

[0053] Through the above technical means, a delay unit is integrated on the single-board computer chip, which can simplify the circuit. When the control unit meets the first condition, the delay unit outputs a delay signal to the logic unit, thereby avoiding the situation where the drive signal is suddenly disconnected when the control unit is reset, continuing to maintain the state of the relay, and improving the safety of the operation of the electric vehicle.

[0054] In a third aspect, an embodiment of the utility model provides a battery pack, the battery pack comprising a battery and a battery management system as described in any one of the first aspects, wherein:

[0055] The relay is connected to the drive unit in the battery management system and is used to control the conduction or disconnection of the relay according to the working state of the drive unit;

[0056] The battery is connected to the battery management system and is used to control the output power supply state of the battery according to the conduction or disconnection of the relay in the battery management system.

[0057] Through the above-mentioned technical means, when the control unit of the battery management system meets the first condition, a delay signal with a preset duration is output, so that the battery management system can continue to control the battery to output a power supply signal when the control unit is reset, thereby improving the safety of the electric vehicle operation.

[0058] The utility model provides a battery management system, a single-board computer chip and a battery pack. When a control unit meets a first condition, a delay unit outputs a delay signal to a logic unit, so that the logic unit can generate a drive signal according to the delay signal to control the on / off of the drive unit, thereby avoiding the situation where the drive signal is suddenly disconnected when the control unit is reset, continuing to maintain the state of the relay, and improving the safety of the operation of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 1 ;

[0060] Figure 2 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 2 ;

[0061] Figure 3 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 3 ;

[0062] Figure 4 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 4 ;

[0063] Figure 5 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 5 ;

[0064] Figure 6 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 6 ;

[0065] Figure 7 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 7 ;

[0066] Figure 8 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 8 ;

[0067] Fig. 9 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 9 ;

[0068] Fig.10 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 10 ;

[0069] Fig.11 A schematic diagram of the structure of a single-board computer chip provided by an embodiment of the utility model;

[0070] Fig.12 A schematic diagram of the structure of a battery pack provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0071] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0073] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0074] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0075] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0076] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0077] In the embodiments of the utility model, the battery may be a battery cell. A battery cell refers to a basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited to this.

[0078] In the embodiment of the utility model, the battery can also be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0079] It is understandable that the power output of electric vehicles is to control the voltage and power output of the high-voltage circuit in the battery pack by using the relay as a switch. For electric vehicles in operation, unexpected interruption of the relay is a more serious relay failure mode, which may cause the relay to change from a closed state to an open state, resulting in the disconnection of the voltage output of the battery pack, posing a great safety hazard to the vehicle.

[0080] The reason for the unexpected interruption of the relay may be due to an abnormal reset of the MCU. In the relevant technology, the MCU is used to provide a continuous drive signal to the relay to keep the relay in a closed state. If the MCU is abnormally reset, the output of the drive signal will be briefly interrupted, causing the relay to disconnect, thereby paralyzing the power system of the electric vehicle.

[0081] Based on this, in order to solve the problem of unexpected interruption of the above-mentioned relay, the embodiment of the utility model provides a battery management system, a single-board computer chip and a battery pack. When the control unit meets the first condition, the delay unit outputs a delay signal to the logic unit, so that the logic unit can generate a drive signal according to the delay signal and continue to output it to the drive unit. This avoids the situation where the drive signal is suddenly disconnected when the control unit is reset, continues to maintain the state of the relay, and improves the safety of the operation of the electric vehicle.

[0082] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0083] Figure 1 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 1 .like Figure 1 As shown, the battery management system 1 includes a delay unit 12 , a logic unit 13 and a drive unit 14 .

[0084] In the embodiment of the utility model, the input end of the delay unit 12 is connected to the output end of the control unit 11 , and the output end of the drive unit 14 is connected to the input end of the relay 15 .

[0085] The delay unit 12 is used to output a delay signal with a preset duration when the control unit 11 meets the first condition.

[0086] In the embodiment of the present utility model, the control unit 11 may be an MCU, that is, a main control chip of a BMS.

[0087] It should be noted that when the control unit 11 is in normal working state, the control unit 11 continuously outputs a control signal to the delay unit 12, and further the logic unit 13 continuously outputs a drive signal to the drive unit 14 according to the signals output by the control unit 11 and the delay unit 12, so that the drive unit 14 continuously outputs a signal to the relay 15 to maintain the relay 15 in a closed state.

[0088] In the embodiment of the utility model, the control unit 11 may be an MCU. The control unit 11 satisfies the first condition, which may refer to the state in which the control unit 11 is abnormally reset and is in a power-off state. In this case, the control unit 11 temporarily stops outputting control signals to the delay unit 12 and the logic unit 13. In order to avoid the interruption of the signal output by the logic unit 13 to the drive unit 14, which causes the interruption of the drive signal output by the drive unit 14 to the relay 15, the delay unit 12 may output a delay signal with a preset duration to the logic unit 13, so as to maintain the logic unit 13 to continue to output the drive signal to the drive unit 14, and maintain the relay 15 in a closed state within the preset duration after the MCU is powered off.

[0089] The delay unit 12 may be a circuit that uses the charging and discharging effect of a capacitor for delay, wherein a capacitor may be set. When the MCU is working normally, the delay unit 12 may receive a control signal output by the MCU to charge the capacitor until it is fully charged. When the MCU is reset, the capacitor in the delay unit 12 is discharged to output a delay signal with a preset duration to the logic unit 13. It can be understood that the specific time of the preset duration can be determined according to the capacity of the capacitor, and the preset duration generally needs to be greater than the duration of power failure when the MCU is reset.

[0090] The logic unit 13 is connected to the delay unit 12 and the control unit 11 respectively, and is used to receive the control signal provided by the control unit 11 and the delay signal provided by the delay unit 12, and generate a driving signal.

[0091] In the embodiment of the utility model, the logic unit 13 may include one of an "AND" gate and an "OR" gate, or a combination of any two of them. According to the delay signal output by the delay unit 12 and the control signal output by the control unit 11, the corresponding driving signal can be output to the driving unit 14 through an "AND" operation or an "OR" operation.

[0092] When the control unit 11 is in normal working state, the control unit 11 outputs a control signal to the delay unit 12, so that the delay unit 12 outputs a continuous delay signal to the logic unit 13, and at the same time outputs a continuous control signal to the logic unit 13, so that the logic unit 13 can perform logical operations on the input delay signal and control signal, and output a continuous drive signal to the drive unit 14, thereby maintaining the relay 15 in a closed state.

[0093] When the control unit 11 is reset and power is cut off, the control unit 11 stops outputting control signals to the delay unit 12 and the logic unit 13, and the delay unit 12 outputs a delay signal with a preset duration to the logic unit 13. In this case, the delay unit 12 may perform logic operations based on the input delay signal, which in some optional embodiments may also include some voltage signals provided by an external continuous power supply, and output a drive signal with the same level state before the reset to the drive unit 14, so that the relay 15 continues to maintain a closed state within the preset duration.

[0094] The driving unit 14 is used to control the working state of the driving unit 14 according to the driving signal.

[0095] The working state includes on or off.

[0096] In the embodiment of the utility model, the driving unit 14 can be connected to the load, that is, the relay 15. After the logic unit 13 outputs the driving signal to the driving unit 14, the driving unit 14 can be used to drive the relay 15 according to the driving signal, wherein the working state of the relay 15 is the same as the working state of the driving unit 14.

[0097] It should be noted that if the drive signal stops outputting, that is, the MCU is not reset after a preset time, or the MCU is powered off, the drive unit 14 is powered off and enters a disconnected working state, and the relay 15 is also disconnected; if the drive signal continues to be outputting, that is, within a preset time after the MCU is reset, or when the MCU is working normally, the drive unit 14 works normally and is in a conducting working state, and the relay 15 remains closed.

[0098] The embodiment of the utility model provides a battery management system, when the control unit meets the first condition, the delay unit outputs a delay signal to the logic unit, so that the logic unit can generate a drive signal according to the delay signal and continue to output it to the drive unit. This avoids the situation where the drive signal is suddenly disconnected when the control unit is reset, continues to maintain the state of the relay, and improves the safety of the operation of the electric vehicle.

[0099] In another embodiment of the present invention, Figure 2 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 2 , Figure 3 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 3 .like Figure 2 , Figure 3 As shown, the logic unit 13 includes a first logic circuit 131 , and the driving unit 14 includes a high-side driving unit 141 .

[0100] Among them, the first input end of the first logic circuit 131 is connected to the output end of the delay unit 12, the second input end of the first logic circuit 131 is connected to the output end of the control unit 11, and the output end of the first logic circuit 131 is connected to the high-side driver unit 141, which is used to receive the first control signal provided by the control unit 11 and the first delay signal provided by the delay unit 12, and generate a first drive signal.

[0101] In the embodiment of the present utility model, Figure 3 As shown, the first logic circuit 131 can be an "OR" gate circuit or an "AND" gate circuit. It can be understood that when the first logic circuit 131 specifically uses different gate circuits, the connection method of the circuit may be slightly different. The embodiment of the utility model takes the first logic circuit 131 as an "OR" gate circuit as an example for description. If the first logic circuit 131 is an "AND" gate circuit, its connection method can refer to the following embodiment.

[0102] As in the above embodiment, when the control unit 11 works normally, the first logic circuit 131 receives the first delay signal input by the delay unit 12 through port 1, and at the same time receives the first control signal input by the control unit 11 through port 2, and generates a first drive signal to the high-side drive unit 141 through the OR operation of the first logic circuit 131. The high-side drive unit 141 can be used to drive the high side of the relay 15 to open and close.

[0103] When the control unit 11 is reset, the control unit 11 stops inputting the first control signal to the first logic circuit 131, and the delay unit 12 outputs the first delay signal to the first logic circuit 131. Since the first logic circuit 131 is an "OR" gate circuit, according to the characteristics of the "OR" gate circuit, the first logic circuit 131 can continue to generate a first drive signal with the same level state as before the control unit 11 is reset, and transmit it to the high-side drive unit 141.

[0104] The high-side driving unit 141 is used to control the working state of the high-side driving unit 141 according to the first driving signal.

[0105] After receiving the first drive signal, the high-side drive unit 141 continues to maintain the on working state when the control unit 11 is reset to close the relay 15; and after the delay unit 12 stops outputting the first delay signal, that is, after the first logic circuit 131 stops outputting the first drive signal, it switches to the off working state, and the relay 15 is disconnected.

[0106] In some embodiments, continue to refer to Figure 3 The delay unit 12 is used to output a first delay signal with a first preset duration when the control unit 11 is reset, and is at a first level within the first preset duration.

[0107] In the embodiment of the utility model, the first level may be a high level. When the control unit 11 is reset, the delay unit 12 outputs a first delay signal of a first preset duration and a first level to the first logic circuit 131 based on the charge and discharge effect of the capacitor.

[0108] It should be noted that when the control unit 11 is in a normal working state, the control unit 11 continuously outputs a control signal to the delay unit 12 , so that the delay unit 12 continuously outputs a signal of the first level to the first logic circuit 131 .

[0109] The first logic circuit 131 is used to perform a logic operation on the first control signal and the first delay signal, and output a first driving signal at a first level within a first preset time period to control the high-side driving unit 141 to remain turned on.

[0110] As mentioned above, the first logic circuit 131 is taken as an "OR" gate circuit for example. For the "OR" gate circuit, port 1 inputs a first delay signal of a first level and port 2 inputs a control signal of a first level. As long as one of the conditions is met, the first drive signal of the first level can be output.

[0111] Therefore, when the control unit 11 is working normally, the control unit 11 outputs a first control signal of a first level to the first logic circuit 131. At the same time, the delay unit 12 outputs a first delay signal of a first level to the first logic circuit 131. After calculation, the "OR" gate circuit outputs a first drive signal of a first level to the high-side drive unit 141, so that the high-side drive unit 141 remains in a conductive working state and the relay 15 is closed.

[0112] When the control unit 11 is reset, the first control signal output by the control unit 11 becomes the second level, the delay unit 12 starts to output the first delay signal of the first level to the first logic circuit 131 within the first preset time length, and the "OR" gate circuit outputs the first drive signal of the first level after calculation, so that the drive unit 14 continues to maintain the on working state within the first preset time length after the control unit 11 is reset, and the relay 15 remains closed within the first preset time length.

[0113] It should also be noted that if Figure 3 As shown, current limiting resistors R1, R2 and R3 can be connected to the output end of the control unit 11, current limiting resistor R5 can be connected to the output end of the delay unit 12, and current limiting resistor R6 can be connected to the output end of the first logic circuit 131 to avoid damage to the device caused by excessive output current, and the resistance value can be determined according to needs. Exemplarily, the resistance value of the current limiting resistor R1 can be 1KΩ, the resistance value of the current limiting resistor R2 can be 1KΩ, the resistance value of the current limiting resistor R3 can be 1KΩ, the resistance value of the current limiting resistor R5 can be 1KΩ, and the resistance value of the current limiting resistor R6 can be 1KΩ.

[0114] In addition, the control unit 11 can be powered by the V1 voltage signal, the high-side drive unit 141 can be powered by receiving the voltage signal output by the external long lead-acid battery V3, and the delay unit 12 can be powered by receiving the voltage signal output by the external lead-acid battery V2.

[0115] The embodiment of the utility model provides a battery management system. When a control unit is reset, a delay unit and a first logic circuit are set so that a high-side drive unit maintains a state before the reset within a first preset time period, thereby avoiding the negative impact of a sudden change in the state of the control unit on the relay, thereby improving the stability of the battery management system and the safety of driving.

[0116] In another embodiment of the present invention, Figure 4 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 4 , Figure 5 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 5 .like Figure 4 , Figure 5As shown, the logic unit 13 includes a second logic circuit 132 , and the driving unit 14 includes a low-side driving unit 142 .

[0117] Among them, the first input end of the second logic circuit 132 is connected to the output end of the delay unit 12, the second input end of the second logic circuit 132 is connected to the output end of the control unit 11, and the output end of the second logic circuit 132 is connected to the low-side drive unit 142, which is used to receive the second control signal provided by the control unit 11 and the second delay signal provided by the delay unit 12, and generate a second drive signal.

[0118] In the embodiment of the present utility model, Figure 5 As shown, the second logic circuit 132 can be an "AND" gate circuit or an "OR" gate circuit. It can be understood that when the second logic circuit 132 specifically uses different gate circuits, the connection method of the circuit may be slightly different. The embodiment of the utility model takes the second logic circuit 132 as an "AND" gate circuit as an example for description. If the second logic circuit 132 is an "OR" gate circuit, its connection method can refer to the above embodiment.

[0119] As mentioned above, when the control unit 11 works normally, the second logic circuit 132 receives the second delay signal input by the delay unit 12 through port 3, and at the same time, receives the second control signal input by the control unit 11 through port 4, and generates a second drive signal to the low-side drive unit 142 through the AND operation of the second logic circuit 132. The low-side drive unit 142 can be used to drive the low side of the relay 15 to open and close.

[0120] When the control unit 11 is reset, the control unit 11 stops inputting the second control signal to the second logic circuit 132, and the delay unit 12 outputs the second delay signal to the second logic circuit 132. Since the second logic circuit 132 is an "AND" gate circuit, according to the characteristics of the "AND" gate circuit, an external power supply is required to continue inputting a signal to port 4 of the second logic circuit 132 so that the second logic circuit 132 can continue to generate a second drive signal with the same level state as before the control unit 11 is reset, and transmit it to the low-side drive unit 142.

[0121] The low-side driving unit 142 is used to control the working state of the low-side driving unit 142 according to the second driving signal.

[0122] After receiving the second drive signal, the low-side drive unit 142 continues to maintain the on working state when the control unit 11 is reset, so that the relay 15 is closed; and after the delay unit 12 stops outputting the second delay signal, that is, after the second logic circuit 132 stops outputting the second drive signal, it switches to the off working state, and the relay 15 is disconnected.

[0123] In some embodiments, see Figure 4 , Figure 5 The battery management system 1 also includes a pull-up circuit, wherein the pull-up circuit is respectively connected to the second output end of the control unit 11 and the second input end of the second logic circuit 132, and is used to pull up the second control signal to the first level when the second control signal output from the second output end of the control unit 11 is at the second level.

[0124] The second level is a reverse level of the first level.

[0125] In the embodiment of the utility model, after the control unit 11 is reset, the external power supply of the first level provided to the second logic circuit 132 through the port 4 can be as follows: Figure 5 The pull-up circuit shown in the figure may include a long power supply V5 and a pull-up resistor R8, wherein the resistance value of the current limiting resistor R8 may be 33KΩ.

[0126] As mentioned above, the first level may be a high level, and the second level may be a low level.

[0127] When the control unit 11 is in normal working state, the signal output by the long power supply V5 and the second control signal output by the control unit 11 are both at the first level, so that the signal input to the port 4 is at the first level; when the control unit 11 is reset, the second control signal becomes the second level, but due to the pull-up effect of the long power supply V5, the signal input to the port 4 is still kept at the first level.

[0128] In some embodiments, Figure 4 , Figure 5 As shown, the delay unit 12 is used to output a second delay signal with a second preset time length when the control unit 11 is reset, and is at the first level within the second preset time length.

[0129] As mentioned above, when the control unit 11 is reset, the delay unit 12 outputs a second delay signal of a second preset duration and at a first level to the second logic circuit 132 based on the charge and discharge effect of the capacitor.

[0130] It should be noted that when the control unit 11 is in a normal working state, the control unit 11 continuously outputs a control signal to the delay unit 12 , so that the delay unit 12 continuously outputs a signal of the first level to the second logic circuit 132 .

[0131] The second logic circuit 132 is used to perform a logic operation on the second control signal and the second delay signal, and output a second driving signal at a first level within a second preset time period to control the low-side driving unit 142 to remain turned on.

[0132] As mentioned above, the second logic circuit 132 is taken as an "AND" gate circuit for example. For the "AND" gate circuit, port 3 inputs a first delayed signal of a first level, and port 4 inputs a signal of a first level. If and only if both conditions are met, a second drive signal of a first level can be output.

[0133] Therefore, when the control unit 11 is working normally, the control unit 11 can output a second control signal of the first level to the second logic circuit 132, and at the same time satisfy the delay unit 12 to output a second delay signal of the first level to the second logic circuit 132. In this way, the "AND" gate circuit outputs a first drive signal of the first level to the low-side drive unit 142 after calculation, so that the low-side drive unit 142 remains in a conductive working state and the relay 15 is closed.

[0134] When the control unit 11 is reset, the second control signal output by the control unit 11 becomes the second level, and the delay unit 12 starts to output the second delay signal of the first level to the second logic circuit 132 within the second preset time length. In order to prevent the "AND" gate circuit from outputting the second drive signal of the second level after calculation, in the embodiment of the utility model, a pull-up circuit is connected to the line for outputting the second control signal from the control unit 11, so that the signal input to the port 4 of the second logic circuit 132 is still the first level, and then the second drive signal output by the "AND" gate circuit is still the first level, so that the drive unit 14 continues to maintain the on working state within the second preset time length after the control unit 11 is reset, and the relay 15 remains closed within the first preset time length.

[0135] It should also be noted that if Figure 5 As shown, the low-side drive unit 142 is powered by V4, wherein the V4 voltage signal can be provided by the control unit 11 to the low-side drive unit 142, or can be provided by an external power supply to power the low-side drive unit 142. A current limiting resistor R4 can also be connected to the output end of the delay unit 12, and a current limiting resistor R7 can be connected to the output end of the second logic circuit 132 to avoid damage to the device caused by excessive output current, and the resistance value can be determined as needed. For example, the resistance value of the current limiting resistor R4 can be 1KΩ, and the resistance value of the current limiting resistor R7 can be 1KΩ.

[0136] The embodiment of the utility model provides a battery management system. When a control unit is reset, a delay unit and a second logic circuit are set to enable a low-side drive unit to maintain a state before the reset within a second preset time period, thereby avoiding the negative impact of a sudden change in the state of the control unit on the relay, thereby improving the stability of the battery management system and the safety of driving.

[0137] In yet another embodiment of the present invention, Figure 6Schematic diagram of the composition structure of a battery management system provided by an embodiment of the present utility model Figure 6 , Figure 7 Schematic diagram of the composition structure of a battery management system provided by an embodiment of the present utility model Figure 7 . As Figure 6 , Figure 7 shown, the battery management system further includes a relay 15, wherein the relay 15 is connected to the driving unit and is used to control the conduction or disconnection of the relay 15 according to the working state of the driving unit.

[0138] It should be noted that the process of the above driving circuit from power-on to power-off is as follows:

[0139] 1. Before power-on, the delay unit in the SBC is used to configure the delay time for the low-side driving unit as the first preset duration, i.e., t1, and the delay time for the high-side driving unit as the second preset duration, i.e., t2.

[0140] 2. After power-on, when the control unit is abnormally reset, the enable signals of the first logic circuit, i.e., port 2 of the "OR" gate circuit, and the second logic circuit, i.e., port 4 of the "AND" gate circuit, i.e., the aforementioned control signals will be lost. Because the delay unit has configured the delays of the first preset duration and the second preset duration respectively, at this time, port 1 maintains a high level for t2 time. When a high level and a low level pass through the "OR" gate circuit, the output port 5 is still at a high level, and the high-side driving unit will continue to work without disconnecting; at the same time, the port 4 of the "AND" gate circuit is a pull-up high-level signal, port 3 maintains a high level for t2 time, and the output port 6 of the two high levels passing through the "AND" gate circuit is still at a high level, and the low-side driving unit will continue to work without disconnecting. After the control unit is reset, ports 2 and 4 are normally powered, and the relay 15 continues to work.

[0141] 3. When powering off, the delay times t1, i.e., the aforementioned third preset duration, and t2, i.e., the aforementioned fourth preset duration, are configured for the delay unit. When t1 = t2, the high-side driving unit and the low-side driving unit are disconnected simultaneously, and the freewheeling loop passes through two channels, i.e., the energy of the relay 15 goes through the high-side freewheeling circuit and the low-side freewheeling circuit at the same time; when t1 > t2, the high-side driving unit is disconnected first, and the low-side driving unit is disconnected later, and the freewheeling passes through the high-side freewheeling circuit; when t1 < t2, the low-side driving unit is disconnected first, and the high-side driving unit is disconnected later, and the freewheeling passes through the low-side freewheeling circuit.

[0142] The embodiment of the present utility model provides a battery management system, which integrates the delay unit into the SBC, simplifies the circuit, and while realizing the relay hold, controls the disconnection sequence of the high-side driving unit and the low-side driving unit through the logic unit and the delay unit, and can also select the freewheeling loop for the relay disconnection to freewheel from the high side or the low side by configuring the delay time.

[0143] In another embodiment of the present invention, Figure 6 , Figure 7 As shown, the logic unit includes a first logic circuit 131 and a second logic circuit 132 , and the driving unit 14 includes a high-side driving unit 141 and a low-side driving unit 142 .

[0144] Among them, the first input end of the first logic circuit 131 is connected to the second output end of the delay unit 12, the second input end of the first logic circuit 131 is connected to the first output end of the control unit 11, and the output end of the first logic circuit 131 is connected to the high-side driver unit 141, which is used to receive the first control signal provided by the control unit 11 and the first delay signal provided by the delay unit 12, and perform logical operations on the first control signal and the first delay signal to generate a first drive signal.

[0145] As in the above-mentioned embodiment, the first logic circuit 131 can be an AND gate circuit or an OR gate circuit; the second logic circuit 132 can be an AND gate circuit or an OR gate circuit. Therefore, the logic unit 13 can include two AND gate circuits, or two OR gate circuits, or one AND gate circuit and one OR gate circuit, which is determined according to specific usage requirements. Among them, the connection mode of different logic units 13 will adapt to changes.

[0146] In the embodiment of the present invention, the first logic circuit 131 is an “OR” gate circuit, and the second logic circuit 132 is an “AND” gate circuit.

[0147] When the control unit 11 works normally, the first logic circuit 131 receives the first delay signal input by the delay unit 12 through port 1, receives the first control signal input by the control unit 11 through port 2, and generates a first drive signal to the high-side drive unit 141 through the OR operation of the first logic circuit 131, so that the high-side drive unit 141 remains in a conductive working state and the relay 15 remains closed.

[0148] The first input end of the second logic circuit 132 is connected to the first output end of the delay unit 12, the second input end of the second logic circuit 132 is connected to the second output end of the control unit 11, and the output end of the second logic circuit 132 is connected to the low-side driving unit 142, and is used to receive the second control signal provided by the control unit 11 and the second delay signal provided by the delay unit 12, and perform logic operations on the second control signal and the second delay signal to generate a second driving signal.

[0149] When the control unit 11 operates normally, the second logic circuit 132 receives the second delay signal input by the delay unit 12 through port 3, receives the second control signal input by the control unit 11 through port 4, and generates a second drive signal to the low-side drive unit 142 through the AND operation of the second logic circuit 132, so that the low-side drive unit 142 maintains a conductive working state and the relay 15 remains closed.

[0150] In some embodiments, the delay unit 12 is used to output a first delay signal having a first preset duration and being at a first level within the first preset duration when the control unit 11 is reset; and to output a second delay signal having a second preset duration and being at a first level within the second preset duration.

[0151] The first logic circuit 131 is used to perform a logic operation on the first control signal and the first delay signal, and output a first driving signal at a first level within a first preset time period to control the high-side driving unit 141 to remain turned on.

[0152] The first preset time length and the second preset time length may be configured for the delay unit 12 before the driving module is powered on, and may be configured by determining an appropriate capacitance based on the corresponding relationship between capacitance and release time.

[0153] In the embodiment of the utility model, the first level can be a high level. When the control unit 11 is reset, the first control signal output by the control unit 11 is switched from the first level to the second level, and the delay circuit outputs a first delay signal having a first preset duration and a first level to the first logic circuit 131. Since the first logic circuit 131 is an "OR" gate circuit, as long as the signal input to at least one of the ports 1 or 2 is at the first level, the output first drive signal is at the first level. Therefore, in this case, after the first logic circuit 131 undergoes an OR operation, it outputs a first drive signal having a first preset duration to the high-side drive unit 141, so that the high-side drive unit 141 continues to remain on within the first preset duration, and thereby the relay 15 also remains closed within the first preset duration, waiting for the reset of the control unit 11 to be completed.

[0154] The second logic circuit 132 is used to perform a logic operation on the second control signal and the second delay signal, and output a second driving signal at a first level within a second preset time period to control the low-side driving unit 142 to remain turned on.

[0155] When the control unit 11 is reset, the second control signal output by the control unit 11 is switched from the first level to the second level, but due to the effect of the pull-up circuit, the signal input to the port 4 of the second logic circuit 132 is still the first level. At the same time, the delay unit 12 outputs a second drive signal with a second preset duration and a first level to the port 3 of the second logic circuit 132. Since the second logic circuit 132 is an AND gate circuit, the signals input to the ports 3 and 4 need to be both at the first level, and the output second drive signal can be the first level. Therefore, in this case, after the AND operation, the second logic circuit 132 outputs a second drive signal with a second preset duration to the low-side drive unit 142, so that the low-side drive unit 142 continues to remain on within the second preset duration, and then the relay 15 also remains closed within the second preset duration, waiting for the reset of the control unit 11 to be completed.

[0156] The embodiment of the utility model provides a battery management system. From the perspective of functional safety, high-side and low-side drivers are used together in a driving relay circuit. When the control unit is reset, a delay unit and a first logic circuit are set so that the high-side driving unit maintains a conductive working state within a first preset time after the control unit is disconnected; and a delay unit and a second logic circuit are set so that the low-side driving unit maintains a conductive working state within a second preset time after the control unit is disconnected, thereby preventing the relay from being accidentally disconnected and causing the power of the entire vehicle to be disconnected, thereby improving the stability of the battery management system and the safety of driving.

[0157] In another embodiment of the present invention, Figure 2 , Figure 3 As shown, the delay unit 12 is used to output a first delay signal with a third preset time length when the control unit 11 is powered off, and is at a first level within the third preset time length.

[0158] In the embodiment of the present utility model, the third preset time length may be equal to the first preset time length, determined according to the capacity of the capacitor in the delay unit 12, or may be other values ​​set by the user.

[0159] In the above-mentioned embodiment, when the control unit 11 is reset, the control unit 11 briefly stops outputting the control signal, that is, the control signal switches from the first level to the second level, and the duration is generally 2 to 3 seconds. In the embodiment of the utility model, when the control unit 11 is powered off, the duration for which the control unit 11 stops outputting the control signal is generally longer, which is specifically determined according to the user's needs.

[0160] When the control unit 11 is powered off, the delay unit 12 can output a first delay signal having a third preset duration and a first level to the first logic circuit 131, so that the first logic circuit 131 remains in a conductive working state within the third preset duration after the control unit 11 is powered off.

[0161] The first logic circuit 131 is used to perform logic operations on the first control signal and the first delay signal, output a first drive signal at a first level within a third preset time period to control the high-side drive unit 141 to remain turned on, and output a first drive signal at a second level after the third preset time period to turn off the high-side drive unit 141.

[0162] In the embodiment of the utility model, after the first logic circuit 131 receives the first delayed signal of the first level through the port 1, since the first logic circuit 131 is an "OR" gate circuit, after performing the OR operation, it outputs the first drive signal with the third preset duration to the high-side drive unit 141, so that the high-side drive unit 141 maintains the on working state within the third preset duration, and thereby the relay 15 continues to remain closed within the third preset duration after the control unit 11 is powered off.

[0163] After the third preset time, the delay unit 12 stops outputting the first delay signal, and the first logic circuit 131 switches the output first drive signal to the second level because the signals input from port 1 and port 2 are both at the second level, so that the high-side drive unit 141 enters the shutdown working state, and the relay 15 is disconnected.

[0164] In some embodiments, Figure 8 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 8 .like Figure 8 As shown, the battery management system 1 further includes a high-side freewheeling circuit 17 , wherein the high-side driving unit 141 is further used to control the energy of the relay 15 to be released through the high-side freewheeling circuit 17 when the high-side driving unit 141 is turned off.

[0165] In the embodiment of the utility model, the two ends of the high-side freewheeling circuit 17 are respectively connected to the relay 15 to form a closed loop with the relay 15. When the high-side driving unit 141 stops outputting the signal of the first level, the direction of the current is used to take advantage of the situation and suppress the increase of the self-inductance voltage generated by the relay 15 at the moment of power failure, thereby providing a release path for the high voltage of the coil in the relay 15.

[0166] An embodiment of the utility model provides a battery management system. When the control unit is powered off, the delay unit outputs a first delay signal with a third preset time length to the first logic circuit, so that the high-side drive unit is turned off after the third preset time length after the control unit is powered off, and the energy of the relay is released through the high-side freewheeling circuit. This delayed shutdown method can protect the components of the electric vehicle, extend its service life, reduce the failure rate of the vehicle, and improve the stability of the battery management system.

[0167] In another embodiment of the present invention, Figure 4 , Figure 5 As shown, the delay unit 12 is used to output a second delay signal with a fourth preset time length when the control unit 11 is powered off, and is at the first level within the fourth preset time length.

[0168] In the embodiment of the present utility model, the fourth preset time length may be equal to the second preset time length, determined according to the capacity of the capacitor in the delay unit 12, or may be other values ​​set by the user.

[0169] When the control unit 11 is powered off, the delay unit 12 can output a second delay signal having a fourth preset duration and a first level to the second logic circuit 132, so that the second logic circuit 132 remains in a conductive working state within the fourth preset duration after the control unit 11 is powered off.

[0170] The second logic circuit 132 is used to perform logic operations on the second control signal and the second delay signal, output a second drive signal at the first level within a fourth preset time period to control the low-side drive unit 142 to remain turned on, and output a second drive signal at the second level after the fourth preset time period to turn off the low-side drive unit 142.

[0171] In the embodiment of the utility model, after receiving the second delay signal of the first level through port 3, the second logic circuit 132 also receives the first level signal provided by the pull-up circuit through port 4. Since the second logic circuit 132 is an "AND" gate circuit, after performing the AND operation, it outputs a second drive signal with a fourth preset duration to the low-side drive unit 142, so that the low-side drive unit 142 maintains a conductive working state within the fourth preset duration, and thereby the relay 15 continues to remain closed within the fourth preset duration after the control unit 11 is powered off.

[0172] After the fourth preset time length, the delay unit 12 stops outputting the first delay signal. Even if the pull-up circuit continues to provide the first level signal, the second logic circuit 132 switches the output second drive signal to the second level through an AND operation, so that the low-side drive unit 142 enters the shutdown working state and the relay 15 is disconnected.

[0173] In some embodiments, Fig. 9 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 9 .like Fig. 9 As shown, the battery management system 1 further includes a low-side freewheeling circuit 18 , wherein the low-side driving unit 142 is further used to control the energy of the relay 15 to be released through the low-side freewheeling circuit 18 when the low-side driving unit 142 is turned off.

[0174] In the embodiment of the utility model, one end of the low-side freewheeling circuit 18 is connected to the relay 15 and the low-side driving unit 142, and the other end is connected to the low-side driving unit and grounded, forming a closed loop with the relay 15. When the low-side driving unit 142 stops outputting the first level signal, the direction of the current is used to take advantage of the situation and suppress the increase of the self-inductance voltage generated by the relay 15 at the moment of power failure, thereby providing a release path for the high voltage of the coil in the relay 15.

[0175] An embodiment of the utility model provides a battery management system. When the control unit is powered off, the delay unit outputs a second delay signal with a fourth preset time length to the second logic circuit, so that the low-side drive unit is turned off after the fourth preset time length after the control unit is powered off, and the energy of the relay is released through the low-side freewheeling circuit 18. This delayed shutdown method can protect the components of the electric vehicle, extend its life, and reduce the failure rate of the vehicle.

[0176] In another embodiment of the utility model, the delay unit 12 is used to output a first delay signal having a third preset time length and being at a first level within the third preset time length when the control unit 11 is powered off; and to output a second delay signal having a fourth preset time length and being at the first level within the fourth preset time length.

[0177] In an embodiment of the utility model, when the relay 15 is driven by the high-side driving unit 141 and the low-side driving unit 142 at the same time, after the control unit 11 is powered off, the delay unit 12 can also output a first delay signal of a third preset duration and a first level to the high-side driving unit 141 to the first logic circuit 131, and at the same time, output a second delay signal of a fourth preset duration and a first level to the low-side driving unit 142 to the second logic circuit 132, so that the high-side driving unit 141 maintains a conductive working state within the third preset duration after the control unit 11 is powered off, and the low-side driving unit 142 maintains a conductive working state within the fourth preset duration after the control unit 11 is powered off.

[0178] The first logic circuit 131 is used to perform logic operations on the first control signal and the first delay signal, output a first drive signal at a first level within a third preset time period to control the high-side drive unit 141 to remain turned on, and output a first drive signal at a second level after the third preset time period to turn off the high-side drive unit 141.

[0179] As mentioned above, after the third preset time length, the delay unit 12 stops outputting the first delay signal, and the first logic circuit 131 switches the output first drive signal to the second level because the signals input from port 1 and port 2 are both at the second level, so that the high-side drive unit 141 enters the shutdown working state, and the relay 15 is disconnected.

[0180] The second logic circuit 132 is used to perform logic operations on the second control signal and the second delay signal, output a second drive signal at the first level within a fourth preset time period to control the low-side drive unit 142 to remain turned on, and output a second drive signal at the second level after the fourth preset time period to turn off the low-side drive unit 142.

[0181] As mentioned above, after the fourth preset time length, the delay unit 12 stops outputting the first delay signal. Even if the pull-up circuit continues to provide the first level signal, the second logic circuit 132 switches the output second drive signal to the second level through an AND operation, causing the low-side drive unit 142 to enter the shutdown working state, and the relay 15 is disconnected.

[0182] In some embodiments, when the third preset time length is equal to the fourth preset time length, the high-side driving unit 141 and the low-side driving unit 142 are turned off at the same time; when the third preset time length is greater than the fourth preset time length, the low-side driving unit 142 is turned off earlier than the high-side driving unit 141; when the third preset time length is less than the fourth preset time length, the high-side driving unit 141 is turned off earlier than the low-side driving unit 142.

[0183] It should be noted that if the third preset time length is equal to the fourth preset time length, the first drive signal and the second drive signal stop being output at the same time, and the high-side drive unit 141 and the low-side drive unit 142 are turned off at the same time. It can be understood that, in general, due to slight errors between devices, even if the configured capacitors are the same, there may be slight differences in the duration of the output of the first delay signal and the second delay signal, resulting in the high-side drive unit 141 and the low-side drive unit 142 not being turned off at the same time.

[0184] It should also be noted that when the third preset time length is greater than the fourth preset time length, the first delay signal is disconnected later than the second delay signal, so that the high-side driver unit 141 is turned off later than the low-side driver unit 142; when the third preset time length is less than the fourth preset time length, the first delay signal is disconnected earlier than the second delay signal, so that the low-side driver unit 142 is turned off later than the high-side driver unit 141.

[0185] In some embodiments, Fig.10 A schematic diagram of the structure of a battery management system provided in an embodiment of the utility model Figure 10 ,like Fig.10As shown, the battery management system 1 further includes a high-side freewheeling circuit 17 and a low-side freewheeling circuit 18, wherein:

[0186] The driving unit 14 is also used to control the energy of the relay 15 to be released through the high-side freewheeling circuit 17 and the low-side freewheeling circuit 18 when the high-side driving unit 141 and the low-side driving unit 142 are turned off at the same time.

[0187] As mentioned above, when the third preset duration is equal to the fourth preset duration, the high-side drive unit 141 and the low-side drive unit 142 are turned off at the same time. In this case, the energy of the relay 15 can go through two freewheeling circuits at the same time, and is released from the high-side freewheeling circuit 17 and the low-side freewheeling circuit 18 at the same time. It can be understood that, in general, even if the third preset duration is configured to be equal to the fourth preset duration, the time when the high-side drive unit 141 and the low-side drive unit 142 are turned off may not be synchronized. Therefore, in specific use, according to the difference in the turn-off time, the energy of the relay 15 may also be released by turning off the freewheeling circuit on one side first.

[0188] The driving unit 14 is further used to control the energy of the relay 15 to be released through the high-side freewheeling circuit 17 when the high-side driving unit 141 is turned off earlier than the low-side driving unit 142 .

[0189] It should be noted that when the third preset time length is less than the fourth preset time length, the high-side drive unit 141 is disconnected first, and the low-side drive unit 142 is disconnected later. In this case, the energy of the relay 15, that is, the freewheeling current, can be released by the high-side drive unit 141 that is disconnected first, thereby avoiding the phenomenon of contact rebound and vibration of the relay 15, which may cause circuit failure.

[0190] The driving unit 14 is further used to control the energy of the relay 15 to be released through the low-side freewheeling circuit 18 when the low-side driving unit 142 is turned off earlier than the high-side driving unit 141 .

[0191] It should also be noted that when the third preset time is greater than the fourth preset time, the low-side drive unit 142 is disconnected first, and the high-side drive unit 141 is disconnected later. In this case, the energy of the relay 15, that is, the freewheeling current, can be released through the low-side drive unit 142 that is disconnected first, thereby avoiding contact rebound, vibration, etc. of the relay 15, which may cause circuit failure.

[0192] In some embodiments, the high-side freewheeling circuit 17 includes a first breakdown diode 171 and a first diode 172, and the low-side freewheeling circuit 18 includes a second breakdown diode 181, wherein:

[0193] The first end of the high-side driving unit 141 is connected to the first power supply, the second end of the high-side driving unit 141 is respectively connected to the first end of the relay 15 and the second end of the first breakdown diode 171, the first end of the first breakdown diode 171 is connected to the first end of the first diode 172, and the second end of the first diode 172 is connected to the second end of the relay 15.

[0194] In the embodiment of the present invention, the first breakdown diode 171 and the first diode 172 are devices that only allow current to flow in one direction.

[0195] It should be noted that when the relay 15 is driven by the high-side drive unit 141 and the low-side drive unit 142 at the same time, and the high-side drive unit 141 is disconnected first, or the relay 15 is driven by the high-side drive unit 141 only, after the high-side drive unit 141 is disconnected, the energy of the relay 15 can be released through the high-side drive unit 141. In the process of release, first, the first breakdown diode 171 is connected in parallel to both ends of the relay 15, and forms a loop with the relay 15, and consumes the energy released by the coil when the relay 15 is turned off when it is broken down. Then, the first diode 172 is reversely connected to the first breakdown diode 171, which can be used to prevent reverse connection of the loop, and consume the energy released by the coil when the relay 15 is turned off in a freewheeling manner, so as to protect the components from being penetrated or burned by excessively high voltage.

[0196] In addition, the high side driving unit 141 may be powered by a first power supply V3, wherein the first power supply V3 may be a long power supply.

[0197] The second end of the relay 15 is also connected to the first end of the low-side driving unit 142 and the first end of the second breakdown diode 181 respectively, the second end of the second breakdown diode 181 is connected to the second end of the low-side driving unit 142, and the second end of the low-side driving unit 142 is grounded.

[0198] It should be noted that when the relay 15 is driven by the high-side drive unit 141 and the low-side drive unit 142 at the same time, and the low-side drive unit 142 is disconnected first, or the relay 15 is driven by only the low-side drive unit 142, after the low-side drive unit 142 is disconnected, the energy of the relay 15 can be released through the low-side drive unit 142. During the release process, one end of the first breakdown diode 171 is connected to the output end of the relay 15, and one end is grounded, forming a loop with the relay 15, and consuming the energy passing through the relay 15 when being broken down.

[0199] It should also be noted that the high-side freewheeling circuit 17 can be a structure including only one breakdown diode, or a structure including one breakdown diode and one diode. In an optional embodiment, the low-side freewheeling circuit 18 can be a structure including only one breakdown diode, or a structure including one breakdown diode and one diode, depending on the specific needs of the user.

[0200] The embodiment of the utility model provides a battery management system, which controls the disconnection sequence of the high-side drive unit and the low-side drive unit by configuring the duration of the first delay signal and the second delay signal, and then automatically selects whether the energy is released from the high-side freewheeling or the low-side freewheeling when the relay is disconnected, thereby protecting the components of the electric vehicle, extending the service life, and reducing the failure rate of the vehicle.

[0201] In another embodiment of the present invention, the first logic circuit 131 has an OR logic operation function, and the second logic circuit 132 has an AND logic operation function.

[0202] As mentioned above, the second logic circuit 132 may be an AND gate circuit having an AND logic operation function, such as Fig.10 As shown, the AND gate circuit may have two input ports, including input port 3 and input port 4, and one output port 6. For the AND gate circuit, when the signals inputted from input port 3 and input port 4 are both at the first level, the second driving signal outputted from output port 6 is at the first level, otherwise, the second driving signal outputted from output port 6 is at the second level.

[0203] It should be noted that the first logic circuit 131 may also be an “AND” gate circuit having an AND logic operation function, or the second logic circuit 132 may also be an “OR” gate circuit having an OR logic operation function.

[0204] In some embodiments, the first logic circuit 131 is used to output a first driving signal at a first level when the first control signal is at a first level or the first delay signal is at a first level.

[0205] As mentioned above, the first logic circuit 131 may be an “OR” gate circuit having an OR logic operation function, such as Fig.10As shown, the "OR" gate circuit may have two input ports, including input port 1 and input port 2, and one output port 5. For the "OR" gate circuit, as long as the signal input to one or both input ports is at the first level, that is, a high level, the first drive signal output through the output port 5 is at the first level, so that the high-side drive unit 141 enters the on working state. Only when the signals input to the input port 1 and the input port 2 are both at the second level, the first drive signal output through the output port 5 is at the second level, that is, a low level, so that the high-side drive unit 141 enters the off working state.

[0206] Alternatively, the first logic circuit 131 is configured to output the first driving signal at the second level when the first control signal is at the second level and the first delay signal is at the second level.

[0207] The second level is a reverse level of the first level, and the high-side driving unit 141 is configured to be turned on when receiving a first driving signal of the first level, and to be turned off when receiving a first driving signal of the second level.

[0208] In some optional embodiments, the first logic circuit 131 may also be an AND gate circuit, which has the function of AND logic operation. The AND gate circuit may have at least two input ports, which are respectively connected to the delay unit 12 and the control unit 11, and the AND gate circuit may also have an output port, which is connected to the high-side driver unit 141. For the AND gate circuit, when the signals input from the two input ports are both at the first level, the first drive signal output from the output port to the high-side driver unit 141 is the first level, so that the high-side driver unit 141 enters the on working state; otherwise, the first drive signal output from the output port to the high-side driver unit 141 is the second level, that is, the low level, so that the high-side driver unit 141 enters the off working state.

[0209] In some embodiments, the second logic circuit 132 is used to output a second driving signal at a first level when the second control signal is at a first level and the second delay signal is at a first level.

[0210] As mentioned above, the second logic circuit 132 may be an AND gate circuit having an AND logic operation function. Fig.10As shown, the AND gate circuit may have at least two input ports, including input port 3 and input port 4, which are respectively connected to the delay unit 12 and the control unit 11. The AND gate circuit may also have an output port 6, which is connected to the low-side driver unit 142. For the AND gate circuit, when the second delay signal input from the input port 3 and the second control signal input from the input port 4 are both at the first level, the second drive signal output from the output port 6 to the high-side driver unit 141 is the first level, so that the low-side driver unit 142 enters the on working state; otherwise, the second drive signal output from the output port 6 to the low-side driver unit 142 is the second level, that is, the low level, so that the low-side driver unit 142 enters the off working state.

[0211] Alternatively, the second logic circuit 132 is used to output a second driving signal at a second level when the second control signal is at a second level or the second delay signal is at a second level.

[0212] The second level is a reverse level of the first level, and the low-side driving unit 142 is configured to be turned on when receiving a second driving signal of the first level, and turned off when receiving a second driving signal of the second level.

[0213] In some optional embodiments, the second logic circuit 132 can also be an "OR" gate circuit, which has an OR logic operation function. The "OR" gate circuit can have two input ports, which are respectively connected to the output end of the delay unit 12 and the output end of the control unit 11, and the "OR" gate circuit can have an output port, which is connected to the input end of the low-side drive unit 142. For the "OR" gate circuit, as long as the signal input by one or both input ports is the first level, that is, a high level, the first level output by the output port causes the low-side drive unit 142 to enter a conducting working state. Only when the signals input by the two input ports are both the second level, the first drive signal output by the output port is the second level, that is, a low level, causing the low-side drive unit 142 to enter a shutoff working state.

[0214] The embodiment of the utility model provides a battery management system, wherein the first logic circuit has an OR operation function or an AND operation function, and the second logic circuit has an AND operation function or an OR operation function. The flexibility of the battery management system is improved through the combination of multiple gate circuits.

[0215] In yet another embodiment of the present invention, Fig.10 As shown, the delay unit 12 is integrated on a single board computer chip (Single Board Computer Chip, SBC).

[0216] In the embodiment of the utility model, the single board computer chip is a single board computer chip, which can be an independent chip including power supply, communication, monitoring diagnosis, safety monitoring and other features and GPIO. The single board computer chip has a built-in delay unit 12, which can be configured to delay power off for a certain time.

[0217] It should be noted that, from the perspective of functional integration, the delay unit is integrated into the SBC chip, so that before the battery management system 1 is powered on, the delay unit 12 in the SBC can be used to configure the first preset time length for the high-side driver unit 141 and the second preset time length for the low-side driver unit 142.

[0218] The embodiment of the utility model provides a battery management system, which integrates a delay unit in an SBC, simplifies the circuit, reduces the interference of peripheral circuits, and saves costs.

[0219] In yet another embodiment of the present application, Fig.11 The following is a schematic diagram of the structure of a single-board computer chip provided by the embodiment of the utility model. Fig.11 As shown, the embodiment of the utility model further provides a single-board computer chip 19, on which is integrated the delay unit 12 provided in the aforementioned embodiment, wherein: the delay unit 12 is used to output a delay signal with a preset duration to the logic unit 13 when the control unit 11 meets the first condition.

[0220] like Fig.10 As shown, the delay unit 12 in the aforementioned battery management system can be integrated on the single board computer chip 19, or, in some optional embodiments, can also be a separate delay chip. If the delay unit 12 is integrated on the single board computer chip 19, before the battery management system is powered on, the duration of the delay signal can be configured by configuring the single board computer chip 19, so that the single board computer chip 19 outputs a delay signal with a preset duration to the logic unit 13.

[0221] Through the above technical means, a delay unit is integrated on the single-board computer chip, which can simplify the circuit. When the control unit meets the first condition, the delay unit outputs a delay signal to the logic unit, thereby avoiding the situation where the drive signal is suddenly disconnected when the control unit is reset, continuing to maintain the state of the relay, and improving the safety of the operation of the electric vehicle.

[0222] In yet another embodiment of the present application, Fig.12 A schematic diagram of the structure of a battery pack provided by an embodiment of the utility model is shown in FIG. Fig.12 As shown, the embodiment of the utility model provides a battery pack 2, the battery pack 2 includes a battery 21 and the aforementioned battery management system 1, wherein:

[0223] The relay 15 is connected to the driving unit in the battery management system 1 and is used to control the conduction or disconnection of the relay 15 according to the working state of the driving unit;

[0224] The battery 21 is connected to the battery management system 1 and is used to control the output power supply state of the battery according to the on or off state of the relay 15 in the battery management system 1 .

[0225] In the embodiment of the present application, the relay 15 in the battery management system 1 can be used as a switch to control the signal output of the battery 21.

[0226] When the control unit 11 works normally, the control unit 11 outputs a control signal to the delay unit, so that the delay unit 12 outputs a continuous signal, and the logic unit 13 continuously outputs a drive signal to the drive unit 14, so that the drive unit 14 continuously outputs a signal to the relay, keeps the relay 15 closed, and thereby enables the battery 21 to maintain normal output of the power supply signal.

[0227] When the control unit 11 is reset, the delay unit 12 outputs a delay signal with a preset duration to the logic unit 13, and the logic unit 13 still outputs a drive signal to the drive unit 14 within the preset duration, so that the drive unit 14 keeps the relay 15 closed within the preset duration, and maintains the battery 21 to continue to output the power supply signal within the preset duration.

[0228] When the control unit 11 is powered off, the delay unit 12 outputs a delay signal logic unit 13 with a preset time length. The logic unit 13 still outputs a drive signal to the drive unit 14 within the preset time length, so that the drive unit 14 still drives the relay 15 to close within the preset time length, maintaining the battery 21 to continue to output the power supply signal within the preset time length; and disconnects the relay 15 after the preset time length, so that the battery 21 stops outputting the power supply signal after the preset time length.

[0229] Through the above-mentioned technical means, when the control unit of the battery management system meets the first condition, a delay signal with a preset duration is output, so that the battery management system can continue to control the battery to output a power supply signal when the control unit is reset, thereby improving the safety of the electric vehicle operation.

[0230] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in one embodiment" or "in some embodiments" appearing throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the utility model, the size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the utility model. The above-mentioned sequence numbers of the embodiments of the utility model are for description only and do not represent the advantages and disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between the embodiments, and the same or similar aspects can be referenced to each other. For the sake of brevity, this article will not repeat them.

[0231] It should also be noted that, in the present invention, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0232] The serial numbers of the above-mentioned embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0233] The methods disclosed in the several method embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments.

[0234] The features disclosed in several product embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new product embodiments.

[0235] The features disclosed in several method or device embodiments provided by the present invention can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0236] The above description is only a preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A battery management system, characterized in that: The battery management system includes a delay unit, a logic unit and a drive unit, wherein: The delay unit is used to output a delay signal with a preset duration when the control unit meets the first condition; The logic unit is connected to the delay unit and the control unit respectively, and is used to receive the control signal provided by the control unit and the delay signal provided by the delay unit, and generate a driving signal; The driving unit is used to control a working state of the driving unit according to the driving signal, wherein the working state includes on or off.

2. The system according to claim 1, characterized in that The logic unit includes a first logic circuit, and the driving unit includes a high-side driving unit, wherein: The first input end of the first logic circuit is connected to the output end of the delay unit, the second input end of the first logic circuit is connected to the output end of the control unit, and the output end of the first logic circuit is connected to the high-side driving unit, for receiving the first control signal provided by the control unit and the first delay signal provided by the delay unit, and generating a first driving signal; The high-side driving unit is used to control the working state of the high-side driving unit according to the first driving signal.

3. The system according to claim 1, characterized in that The logic unit includes a second logic circuit, and the driving unit includes a low-side driving unit, wherein: The first input end of the second logic circuit is connected to the output end of the delay unit, the second input end of the second logic circuit is connected to the output end of the control unit, and the output end of the second logic circuit is connected to the low-side driving unit, for receiving the second control signal provided by the control unit and the second delay signal provided by the delay unit, and generating a second driving signal; The low-side driving unit is used to control the working state of the low-side driving unit according to the second driving signal.

4. The system according to claim 1, characterized in that The logic unit includes a first logic circuit and a second logic circuit, and the driving unit includes a high-side driving unit and a low-side driving unit, wherein: The first input end of the first logic circuit is connected to the second output end of the delay unit, the second input end of the first logic circuit is connected to the first output end of the control unit, and the output end of the first logic circuit is connected to the high-side driving unit, and is used to receive a first control signal provided by the control unit and a first delay signal provided by the delay unit, and perform a logic operation on the first control signal and the first delay signal to generate a first driving signal; The first input end of the second logic circuit is connected to the first output end of the delay unit, the second input end of the second logic circuit is connected to the second output end of the control unit, and the output end of the second logic circuit is connected to the low-side drive unit, and is used to receive the second control signal provided by the control unit and the second delay signal provided by the delay unit, and perform logic operations on the second control signal and the second delay signal to generate a second drive signal.

5. The system according to claim 3 or 4, characterized in that: The battery management system further comprises a pull-up circuit, wherein: The pull-up circuit is connected to the second output terminal of the control unit and the second input terminal of the second logic circuit respectively, and is used for pulling up the second control signal to the first level when the second control signal outputted from the second output terminal of the control unit is at the second level; The second level is a reverse level of the first level.

6. The system according to claim 2, characterized in that The delay unit is used to output the first delay signal having a first preset time length when the control unit is reset, and is at a first level within the first preset time length; The first logic circuit is used to perform a logic operation on the first control signal and the first delay signal, and output the first drive signal at a first level within the first preset time period to control the high-side drive unit to remain turned on.

7. The system according to claim 3, characterized in that The delay unit is used to output the second delay signal with a second preset time length when the control unit is reset, and is at the first level within the second preset time length; The second logic circuit is used to perform a logic operation on the second control signal and the second delay signal, and output the second drive signal at the first level within the second preset time period to control the low-side drive unit to remain turned on.

8. The system according to claim 4, characterized in that The delay unit is used to output the first delay signal having a first preset time length when the control unit is reset, and is at a first level within the first preset time length; and outputting the second delayed signal having a second preset time length, and being at the first level within the second preset time length; The first logic circuit is used to perform a logic operation on the first control signal and the first delay signal, and output the first drive signal at a first level within the first preset time length, so as to control the high-side drive unit to remain turned on; The second logic circuit is used to perform a logic operation on the second control signal and the second delay signal, and output the second drive signal at the first level within the second preset time period to control the low-side drive unit to remain turned on.

9. The system according to claim 2, characterized in that The delay unit is used to output the first delay signal having a third preset time length when the control unit is powered off, and is at the first level within the third preset time length; The first logic circuit is used to perform a logic operation on the first control signal and the first delay signal, output the first drive signal at a first level within the third preset time length to control the high-side drive unit to remain turned on, and output the first drive signal at a second level after the third preset time length to turn off the high-side drive unit.

10. The system according to claim 3, characterized in that The delay unit is used to output the second delay signal having a fourth preset time length when the control unit is powered off, and is at the first level within the fourth preset time length; The second logic circuit is used to perform a logic operation on the second control signal and the second delay signal, output the second drive signal at the first level within the fourth preset time length to control the low-side drive unit to remain turned on, and output the second drive signal at the second level after the fourth preset time length to turn off the low-side drive unit.

11. The system according to claim 4, characterized in that The delay unit is used to output the first delay signal having a third preset time length when the control unit is powered off, and is at the first level within the third preset time length; and outputting the second delayed signal having a fourth preset time length, and being at the first level within the fourth preset time length; The first logic circuit is used to perform a logic operation on the first control signal and the first delay signal, output the first drive signal at a first level within the third preset time length to control the high-side drive unit to remain turned on, and output the first drive signal at a second level after the third preset time length to turn off the high-side drive unit; The second logic circuit is used to perform a logic operation on the second control signal and the second delay signal, output the second drive signal at the first level within the fourth preset time length to control the low-side drive unit to remain turned on, and output the second drive signal at the second level after the fourth preset time length to turn off the low-side drive unit.

12. The system according to claim 11, characterized in that When the third preset time length is equal to the fourth preset time length, the high-side driving unit and the low-side driving unit are turned off at the same time; When the third preset time length is greater than the fourth preset time length, the low-side driving unit is turned off earlier than the high-side driving unit; When the third preset time length is shorter than the fourth preset time length, the high-side driving unit is turned off earlier than the low-side driving unit.

13. The system according to claim 2 or 4, characterized in that: The battery management system further comprises a high-side freewheeling circuit, wherein: The high-side driving unit is further used to control the energy of the relay to be released through the high-side freewheeling circuit when the high-side driving unit is turned off.

14. The system according to claim 3 or 4, characterized in that: The battery management system further comprises a low-side freewheeling circuit, wherein: The low-side driving unit is further used to control the energy of the relay to be released through the low-side freewheeling circuit when the low-side driving unit is turned off.

15. The system according to claim 4, characterized in that The battery management system further includes a high-side freewheeling circuit and a low-side freewheeling circuit, wherein: The driving unit is further used to control the energy of the relay to be released through the high-side freewheeling circuit and the low-side freewheeling circuit when the high-side driving unit and the low-side driving unit are turned off at the same time; The driving unit is further used to control the energy of the relay to be released through the high-side freewheeling circuit when the high-side driving unit is turned off earlier than the low-side driving unit; The driving unit is further configured to control the energy of the relay to be released through the low-side freewheeling circuit when the low-side driving unit is turned off earlier than the high-side driving unit.

16. The system according to claim 15, characterized in that The high-side freewheeling circuit includes a first breakdown diode and a first diode, and the low-side freewheeling circuit includes a second breakdown diode, wherein: The first end of the high-side drive unit is connected to the first power supply, the second end of the high-side drive unit is respectively connected to the first end of the relay and the second end of the first breakdown diode, the first end of the first breakdown diode is connected to the first end of the first diode, and the second end of the first diode is connected to the second end of the relay; The second end of the relay is also connected to the first end of the low-side drive unit and the first end of the second breakdown diode respectively, the second end of the second breakdown diode is connected to the second end of the low-side drive unit, and the second end of the low-side drive unit is grounded.

17. The system according to any one of claims 1 to 4, characterized in that The first logic circuit has an OR logic operation function, and the second logic circuit has an AND logic operation function.

18. The system according to claim 17, characterized in that The first logic circuit is used to output a first driving signal at a first level when the first control signal is at a first level or the first delay signal is at a first level; or The first logic circuit is used to output the first driving signal at the second level when the first control signal is at the second level and the first delay signal is at the second level; The second level is a reverse level of the first level, and the high-side driving unit is used to be turned on when receiving the first driving signal at the first level; and turned off when receiving the first driving signal at the second level.

19. The system according to claim 17, characterized in that The second logic circuit is used to output a second driving signal at the first level when the second control signal is at the first level and the second delay signal is at the first level; or, The second logic circuit is used to output the second driving signal at the second level when the second control signal is at the second level or the second delay signal is at the second level; The second level is a reverse level of the first level, and the low-side driving unit is used to be turned on when receiving the second driving signal at the first level; and turned off when receiving the second driving signal at the second level.

20. The system according to any one of claims 1 to 4, characterized in that The delay unit is integrated on a single-board computer chip.

21. The system according to any one of claims 1 to 4, characterized in that The battery management system further comprises a relay, wherein: The relay is connected to the driving unit and is used to control the on or off of the relay according to the working state of the driving unit.

22. A single board computer chip, characterized in that: The single-board computer chip is integrated with a delay unit in a battery management system according to any one of claims 1 to 21, wherein: The delay unit is used to output a delay signal with a preset duration to the logic unit when the control unit meets the first condition.

23. A battery pack, characterized in that: The battery pack comprises a battery and a battery management system according to any one of claims 1 to 21, wherein: The relay is connected to the driving unit in the battery management system and is used to control the conduction or disconnection of the relay according to the working state of the driving unit; The battery is connected to the battery management system and is used to control the output power supply state of the battery according to the on or off of the relay in the battery management system.

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