Battery management unit, battery management system, battery pack and electric device

Abstract

The utility model provides a battery management unit, a battery management system, a battery pack and an electric device, and belongs to the technical field of batteries. The battery management unit comprises a control circuit, a first reset circuit and a second reset circuit, the control circuit is used for outputting a control signal, and the first reset circuit is connected with a control signal output port of the control circuit and used for receiving the control signal sent by the control circuit and sending an optical signal based on the control signal; and the second reset circuit is connected with a reset signal receiving port of the control circuit, and is used for receiving the optical signal sent by the first reset circuit, sending a reset signal to the control circuit in response to the situation that the second reset circuit does not receive the optical signal within a preset duration, and controlling the control circuit to reset.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery management unit, a battery management system, a battery pack and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] During the use of the battery, a battery management unit needs to be used to manage the battery. How to reduce the power consumption of battery management is an important research direction in the use of the battery. UTILITY MODEL CONTENT

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery management unit, a battery management system, a battery pack and a power utilization device to improve the problem of high power consumption in the related art.

[0005] The embodiment of the first aspect of the present application provides a battery management unit, which comprises a control circuit, a first reset circuit and a second reset circuit. The control circuit is used to output a control signal. The first reset circuit is connected with the control signal output port of the control circuit, used to receive the control signal sent by the control circuit and send an optical signal based on the control signal. The second reset circuit is connected with the reset signal receiving port of the control circuit, used to receive the optical signal sent by the first reset circuit, and send a reset signal to the control circuit in response to the second reset circuit not receiving the optical signal within a preset time length, to control the reset of the control circuit.

[0006] In the technical scheme of the embodiment of the present application, the reset control of the battery management unit is realized by the first reset circuit, the second reset circuit and the optical signal, so that the battery management unit is restored to the initialization state. When the control circuit fails due to abnormality, the probability of program loop and crash caused by the fact that the battery management unit is still in the working state is reduced. At the same time, the first reset circuit and the second reset circuit can effectively reduce the power consumption compared with the watchdog circuit. In addition, this implementation scheme has strong anti-interference ability, reliable and stable circuit, simple implementation, low cost, and wide application prospect.

[0007] In some embodiments, the first reset circuit comprises a signal emitter and a MOS tube, the signal emitter is connected in series with the MOS tube, and the MOS tube receives a control signal sent by the control circuit to control the period of the light signal sent by the signal emitter. The MOS tube receives the control signal sent by the control circuit, which can efficiently and reliably control the period of the light signal sent by the signal emitter based on the received control signal sent by the control circuit.

[0008] In some embodiments, the first reset circuit further comprises a current limiting device, the current limiting device, the signal emitter and the MOS tube are connected in series, and the current limiting device is used to limit the current flowing through the first reset circuit. By setting the current limiting device, it can prevent the current from being too large to burn out the components connected in series in the first reset circuit, thereby improving the stability and life of the first reset circuit, and further improving the stability and life of the battery management unit.

[0009] In some embodiments, the first reset circuit further comprises a first filter component, the first filter component is connected in series with the MOS tube, and the first filter component is used to filter the interference signal in the first reset circuit. The first filter component can filter the interference signal in the first reset circuit, so that the signal transmitted by the first reset circuit is more accurate.

[0010] In some embodiments, the second reset circuit comprises a signal receiver, the signal receiver is used to receive the light signal sent by the signal emitter, and the period of the light signal received by the signal receiver is the same as the period of the light signal emitted by the signal emitter. By making the period of the light signal received by the signal receiver the same as the period of the light signal emitted by the signal emitter, the signal receiver can timely receive the light signal emitted by the signal emitter, so that it can timely send a reset signal to the control circuit when no light signal is received, control the reset of the control circuit, and reduce the probability of the battery management unit being dead.

[0011] In some embodiments, the second reset circuit further comprises an operational amplifier, the operational amplifier is connected in series with the signal receiver, and the operational amplifier is used to adjust the intensity of the reset signal. By adjusting the intensity of the reset signal through the operational amplifier, the transmission of the reset signal can be more stable.

[0012] In some embodiments, the second reset circuit further comprises a second filter component, the second filter component is connected with the input port of the operational amplifier, and the second filter component is used to filter out the interference signal existing in the input port of the operational amplifier. By filtering out the interference signal existing in the input port of the operational amplifier, the purity of the signal of the input amplifier and the stability of the system are improved.

[0013] In some embodiments, the second reset circuit further comprises a third filtering component connected to the output port of the operational amplifier, and the third filtering component is configured to filter out interference signals existing in the output port of the operational amplifier. By filtering out the interference signals existing in the output port of the operational amplifier, the purity of the reset signal of the input control circuit and the stability of the system are improved.

[0014] In some embodiments, the control signal sent by the control circuit is a square wave signal. By setting the control signal sent by the control circuit as a square wave signal, the first reset circuit can more accurately send the light signal, thereby more accurately controlling the reset of the control circuit.

[0015] In some embodiments, the light signal is infrared. By setting the light signal as infrared, the light signal has strong anti-interference ability during transmission.

[0016] Embodiments of the second aspect of the application provide a battery management system, which comprises the battery management unit in the foregoing embodiments.

[0017] Embodiments of the third aspect of the application provide a battery pack, which comprises a battery and the battery management system in the foregoing embodiments.

[0018] Embodiments of the fourth aspect of the application provide a power consumption device, which comprises the battery pack in the foregoing embodiments.

[0019] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] In the drawings, like reference numerals refer to same or similar components throughout the several views. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments in accordance with the present disclosure and should not be considered limiting of the scope of the application.

[0021] Fig. 1 a schematic diagram of the battery management unit of some embodiments of the application;

[0022] Fig. 2 a schematic diagram of the first reset circuit of some embodiments of the application;

[0023] Fig. 3 a schematic diagram of the second reset circuit of some embodiments of the application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1000, battery management unit;

[0026] 110, control circuit; 120, first reset circuit; 130, second reset circuit;

[0027] 111, control signal output port; 112, reset signal receiving port;

[0028] 121, signal transmitter; 122, MOS tube; 123, current limiting device; 124, first filter component;

[0029] 131, signal receiver; 132, operational amplifier; 133, second filter component; 134, third filter component. DETAILED DESCRIPTION

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0033] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects before and after it.

[0035] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0039] With the increase of functions of a device or a system powered by a battery, the device or the system becomes more and more complex, and the program run by a single-chip microcomputer, a central processing unit (CPU) or a microcontroller unit (MCU) is more and more large. Thus, the system or the device is easily affected by abnormal program running, at this time, the system needs to be restarted by resetting the hardware to restore the normal running state. Therefore, in the related art, a watchdog is usually used to reset the hardware to restart the system. The watchdog has the advantages of being different from the implementation of the source program, not being damaged by software, and having stability and reliability. However, the use of the watchdog causes high power consumption of the system.

[0040] Therefore, the embodiments of the present application disclose a battery management unit, which comprises a control circuit, a first reset circuit and a second reset circuit. The control circuit is configured to output a control signal. The first reset circuit is connected with a control signal output port of the control circuit and configured to receive the control signal output by the control circuit and send an optical signal based on the control signal. The second reset circuit is connected with a reset signal receiving port of the control circuit and configured to receive the optical signal sent by the first reset circuit and send a reset signal to the control circuit in response to the second reset circuit not receiving the optical signal within a preset time length, so as to reset the control circuit. The reset control of the battery management unit is realized by the first reset circuit, the second reset circuit and the optical signal, so that the battery management unit is restored to an initial state. When the control circuit is abnormally caused to fail, the probability of program loop and system crash caused by the battery management unit still being in a working state is reduced. At the same time, the first reset circuit and the second reset circuit can effectively reduce the power consumption compared with the watchdog circuit. In addition, the implementation scheme has strong anti-interference ability, the circuit is reliable and stable, the implementation manner is simple, the cost is low, and has wide application prospect.

[0041] The battery management unit disclosed by the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto.

[0042] The embodiments of the present application provide a battery management unit, Fig. 1 a schematic diagram of the battery management unit of some embodiments of the present application, Fig. 2 a schematic diagram of the first reset circuit of some embodiments of the present application, Fig. 3 a schematic diagram of the second reset circuit of some embodiments of the present application, and Figs. 1 to 3As shown, the battery management unit 1000 includes a control circuit 110, a first reset circuit 120 and a second reset circuit 130. The control circuit 110 is configured to output a control signal. The first reset circuit 120 is connected to a control signal output port 111 of the control circuit 110 and configured to receive the control signal output by the control circuit 110 and send an optical signal based on the control signal. The second reset circuit 130 is connected to a reset signal receiving port 112 of the control circuit 110 and configured to receive the optical signal sent by the first reset circuit 120. In response to the second reset circuit 130 not receiving the optical signal within a preset time period, the second reset circuit 130 sends a reset signal to the control circuit 110 to control the control circuit 110 to reset.

[0043] In the embodiment of the present application, the control circuit 110 can be any single-chip microcomputer, CPU or microcontroller (MCU) used for controlling the battery in the related art. The control circuit 110 can be configured to implement communication or control functions. The control circuit 110 can include a control signal output port 111 and a reset signal receiving port 112. The control signal output port 111 is connected to the first reset circuit 120, and the reset signal receiving port 112 is connected to the second reset circuit 130. The control circuit 110 can send a control signal to the first reset circuit 120 through the control signal port. The control circuit 110 can receive a reset signal sent by the second reset circuit 130 through the reset signal receiving port 112. The control circuit 110 can also set the time for sending the control signal. According to the set time, the control circuit 110 outputs the control signal at intervals, for example, the control signal can be a square wave signal.

[0044] The first reset circuit 120 can include a signal transmitter 121. After receiving the control signal sent by the control circuit 110, the signal transmitter 121 sends an optical signal based on the control signal. The optical signal can be infrared light.

[0045] The second reset circuit 130 can include a signal receiver 131 configured to receive the optical signal sent by the first reset circuit 120. In theory, the optical signal should be received within a preset time period. If the second reset circuit 130 does not receive the optical signal sent by the first reset circuit 120 within the preset time period, it means that the control circuit 110 is out of control and needs to be reset. At this time, the second reset circuit 130 sends a reset signal to the control circuit 110 to control the control circuit 110 to reset.

[0046] For example, the control signal sent by the control circuit 110 can be a square wave signal with different duty cycles, and the first reset circuit 120 can send the light signal at a preset period based on the square wave signal with different duty cycles to detect whether the signals of the input port and the output port of the control circuit 110 are normal. When the duty cycle of the control signal is set to 1S, 2S or 3S, the first reset circuit 120 sends the light signal at intervals of 1S, 2S or 3S. In response to the fact that the second reset circuit 130 does not receive the light signal within 1S, 2S or 3S, the second reset circuit 130 sends a reset signal to the control circuit 110 to control the control circuit 110 to reset, and proves that the signals of the input and output ports of the control circuit 110 are abnormal.

[0047] In the embodiments of the present application, the reset control of the battery management unit 1000 is realized by the first reset circuit 120, the second reset circuit 130 and the light signal, so that the battery management unit 1000 is restored to the initialization state. When the control circuit 110 is abnormal and the control circuit 110 fails, the probability of program loop and system crash caused by the fact that the battery management unit 1000 is still in the working state is reduced. At the same time, the first reset circuit 120 and the second reset circuit 130 can effectively reduce the power consumption compared with the watchdog circuit. In addition, the implementation scheme has strong anti-interference ability, reliable and stable circuit, simple implementation, low cost and wide application prospect.

[0048] According to some embodiments of the present application, the first reset circuit 120 includes a signal transmitter 121 and a MOS tube 122, the signal transmitter 121 is connected in series with the MOS tube 122, and the MOS tube 122 receives the control signal sent by the control circuit 110 to control the period of the light signal sent by the signal transmitter 121.

[0049] The MOS tube 122 is a circuit constructed by using the principle that the MOS tube 122 gate controls the on-off of the MOS tube 122 source and drain. The MOS tube 122 is divided into N-channel and P-channel, so the switching circuit is also mainly divided into two kinds. The N-channel MOS tube 122 is turned on when the gate voltage is higher than the source voltage, and is turned off when the gate voltage is lower than the source voltage; while the P-channel MOS tube 122 is turned on when the gate voltage is lower than the source voltage, and is turned off when the gate voltage is higher than the source voltage. The MOS tube 122 can be connected according to the type of the electronic components used according to the concept of the present application. In addition, the MOS tube 122 in the embodiments of the present application can be an N-channel MOS tube 122 or a P-channel MOS tube 122.

[0050] In the embodiments of the present application, the first reset circuit 120 can receive the control signal sent by the control circuit 110 through the MOS tube 122. The MOS tube 122 can control the on-off of the first reset circuit 120 based on the control signal, so as to control the period of the light signal sent by the signal transmitter 121. The period of the light signal sent by the signal transmitter 121 is consistent with the period of the control signal sent by the control circuit 110.

[0051] The signal transmitter 121 can be an infrared transmitter for generating and emitting infrared signals.

[0052] In the embodiments of the present application, the MOS tube 122 is used to receive the control signal sent by the control circuit 110, which can efficiently and reliably control the period of the light signal sent by the signal transmitter 121 based on the received control signal sent by the control circuit 110.

[0053] According to some embodiments of the present application, the first reset circuit 120 further includes a current limiting device 123, the current limiting device 123, the signal transmitter 121 and the MOS tube 122 are connected in series, and the current limiting device 123 is used to limit the current flowing through the first reset circuit 120.

[0054] In the embodiments of the present application, the current limiting device 123 can be a current limiting resistor. The current limiting device 123 is used to limit the current flowing through the first reset circuit 120, so as to prevent the current from being too large to burn out the components connected in series in the first reset circuit 120. The specification of the current limiting resistor can be selected according to the specification parameters of the signal transmitter 121.

[0055] In the embodiments of the present application, by setting the current limiting device 123, it can be prevented that the current is too large to burn out the components connected in series in the first reset circuit 120, so as to improve the stability and life of the first reset circuit 120, and further improve the stability and life of the battery management unit 1000.

[0056] According to some embodiments of the present application, the first reset circuit 120 further includes a first filter component 124, the first filter component 124 is connected in series with the MOS tube 122, and the first filter component 124 is used to filter the interference signal in the first reset circuit 120.

[0057] In this embodiment, the first filtering component 124 can be an RC filter. The principle of an RC filter circuit is based on a combination of capacitors and resistors. The charging and discharging characteristics of the capacitor are used to filter out high-frequency components in the signal, retaining only low-frequency components. When the input signal passes through the RC filter, the resistor and capacitor form a voltage divider network. High-frequency signals require extremely frequent changes in current and voltage within a short period. The capacitor exhibits high resistance for very high-frequency signals, effectively acting as an open circuit, allowing the current of the high-frequency signal to bypass the capacitor, and the output terminal receives no high-frequency components. For low-frequency signals, the changes are slow, and the capacitor exhibits low resistance, effectively acting as a closed circuit, allowing the low-frequency signal to flow to the output terminal through the capacitor. In this way, the RC low-pass filter successfully filters out high-frequency signals, retaining only low-frequency components. Interference signals in the first reset circuit 120 can be filtered by changing the parameters of the resistor and capacitor.

[0058] In this embodiment, the first filtering component 124 can filter the interference signal in the first reset circuit 120, making the signal transmitted by the first reset circuit 120 more accurate.

[0059] According to some embodiments of this application, the second reset circuit 130 includes a signal receiver 131, which is used to receive optical signals sent by the signal transmitter 121. The period of the optical signal received by the signal receiver 131 is the same as the period of the optical signal transmitted by the signal transmitter 121.

[0060] In this embodiment, the signal receiver 131 can be an infrared receiver for receiving infrared signals. The period at which the signal receiver 131 receives the light signal can be set based on the period at which the signal transmitter 121 transmits the light signal.

[0061] In addition, such as Fig. 3 As shown, the second reset circuit 130 also includes resistors R2 and R3, and capacitor C2. R2 can serve as a grounding resistor to prevent the port of the control circuit 110 from being left floating; R3 can serve as a feedback resistor, and by adjusting its resistance value to be the same as the internal resistance of the signal source, it can reduce the output offset voltage and improve the tracking accuracy; C2 can serve as a filter capacitor to reduce the impact of power supply noise on the second reset circuit 130.

[0062] In this embodiment, the period of receiving the optical signal by the signal receiver 131 is the same as the period of transmitting the optical signal by the signal transmitter 121. The signal receiver 131 can receive the optical signal transmitted by the signal transmitter 121 in a timely manner, so that when no optical signal is received, a reset signal can be sent to the control circuit 110 in a timely manner to control the control circuit 110 to reset, thereby reducing the probability of the battery management unit 1000 crashing.

[0063] According to some embodiments of the present application, the second reset circuit 130 further comprises an operational amplifier 132, which is connected in series with the signal receiver 131, and is configured to adjust the intensity of the reset signal.

[0064] The operational amplifier 132 is a circuit unit with high amplification, which is mainly used for adjusting mathematical operation of signals. In response to the second reset circuit 130 not receiving the optical signal within a preset time length, the reset signal is sent to the control circuit 110 to reset the control circuit 110. The intensity of the control signal may be too large or too small, and the operational amplifier 132 can adjust the intensity of the reset signal to be suitable for the control circuit 110. The appropriate signal intensity can reduce the power required by the control circuit 110 when receiving the reset signal, thereby prolonging the service life of the control circuit 110. As shown in FIG. 1, the operational amplifier 132 is connected in series with the signal receiver 131. Fig. 3

[0065] At the same time, the operational amplifier 132 can also act as a voltage follower, which isolates the input and output circuits to protect the front-stage circuit from the output circuit. This helps to prevent the load circuit from having a negative impact on the signal source, and at the same time, the input signal voltage fluctuates greatly, which is easy to cause the performance of the circuit to decline, and the operational amplifier 132 can limit these influences within its internal, without transmitting to the subsequent circuit.

[0066] In the embodiments of the present application, the intensity of the reset signal is adjusted by the operational amplifier 132, which can make the transmission of the reset signal more stable.

[0067] According to some embodiments of the present application, the second reset circuit 130 further comprises a second filter component 133, which is connected with the input port of the operational amplifier 132, and is configured to filter out the interference signals existing in the input port of the operational amplifier 132.

[0068] ​In the embodiments of the present application, the second filter component 133 can be an RC filter. The principle of the RC filter circuit is based on the combination of a capacitor and a resistor, and the high-frequency components in the signal are filtered out through the charging and discharging characteristics of the capacitor, and only the low-frequency components are retained. When the input signal passes through the RC filter, the resistor and the capacitor form a voltage divider network. The high-frequency signal requires the current and voltage to change very frequently in a short time, while the capacitor exhibits a very high resistance to the signal with a very high frequency, which is equivalent to an open circuit, so that the current of the high-frequency signal bypasses the capacitor, and the output end cannot receive the high-frequency component. For the low-frequency signal, it changes slowly, and the capacitor exhibits a low resistance to it, which is equivalent to a closed circuit, and the low-frequency signal flows to the output end through the capacitor. In this way, the RC low-pass filter successfully filters out the high-frequency signal and only retains the low-frequency component. The second filter component 133 can filter out the interference signals existing at the input port of the operational amplifier 132.

[0069] In the embodiments of the present application, by filtering out the interference signals existing at the input port of the operational amplifier 132, the purity of the input signal of the input amplifier and the stability of the system are improved.

[0070] According to some embodiments of the present application, the second reset circuit 130 further includes a third filter component 134, the third filter component 134 is connected with the output port of the operational amplifier 132, and the third filter component 134 is used for filtering out the interference signals existing at the output port of the operational amplifier 132.

[0071] In the embodiments of the present application, the second filter component 133 can be an RC filter. The principle of the RC filter circuit is based on the combination of a capacitor and a resistor, and the high-frequency components in the signal are filtered out through the charging and discharging characteristics of the capacitor, and only the low-frequency components are retained. When the input signal passes through the RC filter, the resistor and the capacitor form a voltage divider network. The high-frequency signal requires the current and voltage to change very frequently in a short time, while the capacitor exhibits a very high resistance to the signal with a very high frequency, which is equivalent to an open circuit, so that the current of the high-frequency signal bypasses the capacitor, and the output end cannot receive the high-frequency component. For the low-frequency signal, it changes slowly, and the capacitor exhibits a low resistance to it, which is equivalent to a closed circuit, and the low-frequency signal flows to the output end through the capacitor. In this way, the RC low-pass filter successfully filters out the high-frequency signal and only retains the low-frequency component. The third filter component 134 can filter out the interference signals existing at the output port of the operational amplifier 132.

[0072] In the embodiments of the present application, by filtering out the interference signals existing at the output port of the operational amplifier 132, the purity of the reset signal of the input control circuit 110 and the stability of the system are improved.

[0073] According to some embodiments of the present application, the control signal sent by the control circuit 110 is a square wave signal.

[0074] The square wave signal is a periodic electrical signal, which is characterized by instantaneous jump between maximum and minimum, forming a sawtooth shape. The rising edge and the falling edge of the square wave signal are very steep, almost vertical. In a cycle of the square wave signal, the ratio of the time when the voltage is in the high state to the total cycle time is the duty cycle of the square wave. The square wave signal can be efficiently transmitted in the circuit system, especially without distortion from the source end to the receiving end in the required time.

[0075] In the embodiment of the application, the control signal sent by the control circuit 110 can be a square wave signal with different duty cycles, and the first reset circuit 120 can send the light signal based on the square wave signal with different duty cycles at a preset period to detect whether the signals of the input port and the output port of the control circuit 110 are normal.

[0076] For example, the duty cycle of the control signal is set to 1S, 2S or 3S, and the first reset circuit 120 sends the light signal at intervals of 1S, 2S or 3S. In response to the fact that the second reset circuit 130 does not receive the light signal within 1S, 2S or 3S, the second reset circuit 130 sends a reset signal to the control circuit 110 to control the control circuit 110 to reset, and proves that the input and output port signals of the control circuit 110 are abnormal.

[0077] In the embodiment of the application, the control signal sent by the control circuit 110 is set to a square wave signal, and the square wave signal can be used to more accurately control the first reset circuit 120 to send the light signal, so as to more accurately control the control circuit 110 to reset.

[0078] According to some embodiments of the application, the light signal is infrared.

[0079] In the embodiment of the application, the infrared is also called infrared radiation, which is an electromagnetic wave with a wavelength range of 0.76-1000 microns in the infrared waveband between visible light and microwaves. It is invisible light with a lower frequency than red light. At the same time, infrared has strong penetration ability and can penetrate certain opaque substances. Infrared transmission also has good concealment and security, and the environmental light has little effect on it, and it has strong anti-interference ability.

[0080] In the embodiment of the application, by setting the light signal as infrared, the light signal transmission process has strong anti-interference ability.

[0081] The embodiment of the second aspect of the application provides a battery management system, which comprises the battery management unit in the foregoing embodiment.

[0082] In the embodiment of the application, the specific content of the battery management unit can be referred to the related description in the foregoing embodiment, which will not be repeated here.

[0083] The battery management system in the embodiment can have all the beneficial effects of the battery management unit described above, which will not be repeated here.

[0084] The embodiment of the third aspect of the application provides a battery pack, which comprises a battery and the battery management system in the above-described embodiments.

[0085] In the embodiment of the application, the specific content of the battery management system can be referred to the related description in the above-described embodiments, which will not be repeated here.

[0086] In the embodiment of the application, for example, the battery can comprise a shell, a battery cell and the battery management system of any of the above-described embodiments. The shell forms an accommodating cavity for accommodating the battery cell. The battery management system is fixed on the shell and is in communication connection with the battery cell. Specifically, the shell can be a closed shell or a shell with an opening, and the shape, size and detailed structure of the shell are not specifically limited in the embodiment. The battery cell can be one or more and is accommodated in the accommodating cavity of the shell in any manner. The two adjacent battery cells can be in direct contact or be spaced apart to form a heat dissipation air duct. The battery management system can be fixed on the shell in any existing manner. The structure, function and effect of the battery management system are the same as those of the above-described embodiments, and the specific details can be referred to the above-described embodiments, which will not be repeated here.

[0087] The battery of the embodiment has the battery management system, which is electrically connected between the operation switch and the controller through the delay control circuit. The delay control circuit outputs the reset trigger signal to the controller according to the length of the duration of the control signal input by the operation switch, so as to reset the hardware of the battery. In this way, the disadvantage of separately setting the reset button is avoided, and the cost is saved. Moreover, since the control signal needs to exceed the first preset time to make the delay control circuit generate the reset trigger signal, the hardware reset function will not be triggered by mistake.

[0088] The battery pack in the embodiment can have all the beneficial effects of the battery management system described above, which will not be repeated here.

[0089] The embodiment of the fourth aspect of the application provides a power consumption device, which comprises the battery pack in the above-described embodiments.

[0090] The power consumption device in the embodiment can have all the beneficial effects of the battery pack described above, which will not be repeated here.

[0091] The application will be described below by means of a specific embodiment, as shown in Figs. 1 to 3

[0092] ​The battery management unit 1000 comprises a control circuit 110, a first reset circuit 120 and a second reset circuit 130, the control circuit 110 is configured to output a control signal, the first reset circuit 120 is connected with a control signal output port 111 of the control circuit 110, configured to receive the control signal sent by the control circuit 110, and send an optical signal based on the control signal, the second reset circuit 130 is connected with a reset signal receiving port 112 of the control circuit 110, configured to receive the optical signal sent by the first reset circuit 120, and send a reset signal to the control circuit 110 in response to that the second reset circuit 130 does not receive the optical signal within a preset time length, and control the control circuit 110 to reset, wherein the control signal sent by the control circuit 110 is a square wave signal, and the optical signal is infrared ray.

[0093] The first reset circuit 120 comprises a signal transmitter 121, a MOS tube 122, a current limiting device 123 and a first filter assembly 124, the signal transmitter 121, the MOS tube 122, the current limiting device 123 and the first filter assembly 124 are connected in series, the MOS tube 122 receives the control signal sent by the control circuit 110, so as to control the period of sending the optical signal by the signal transmitter 121, the current limiting device 123 is configured to limit the current flowing through the first reset circuit 120, and the first filter assembly 124 is configured to filter the interference signal in the first reset circuit 120.

[0094] The second reset circuit 130 comprises a signal receiver 131, an operational amplifier 132, a second filter assembly 133 and a third filter assembly 134, the signal receiver 131 is configured to receive the optical signal sent by the signal transmitter 121, and the period of receiving the optical signal by the signal receiver 131 is the same as the period of emitting the optical signal by the signal transmitter 121, the operational amplifier 132 is connected with the signal receiver 131 in series, and the operational amplifier 132 is configured to adjust the intensity of the reset signal, the second filter assembly 133 is connected with an input port of the operational amplifier 132, and the second filter assembly 133 is configured to filter the interference signal existing in the input port of the operational amplifier 132, and the third filter assembly 134 is connected with an output port of the operational amplifier 132, and the third filter assembly 134 is configured to filter the interference signal existing in the output port of the operational amplifier 132.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management unit, characterized by, The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit.

2. The battery management unit of claim 1, wherein, The application relates to a battery management unit.

3. The battery management unit of claim 2, wherein, The application relates to a battery management unit.

4. The battery management unit of claim 2, wherein, The application relates to a battery management unit.

5. The battery management unit of claim 2, wherein, The application relates to a battery management unit.

6. The battery management unit of claim 5, wherein, The application relates to a battery management unit.

7. The battery management unit of claim 6, wherein, The application relates to a battery management unit.

8. The battery management unit of claim 6, wherein, The application relates to a battery management unit.

9. The battery management unit of any one of claims 1 to 8, wherein, The application relates to a battery management unit.

10. The battery management unit of any one of claims 1 to 8, wherein, The application relates to a battery management unit.

11. A battery management system, characterized by, The application relates to a battery management unit.

12. A battery pack, characterized by The application relates to a battery management unit.

13. An electrical device, characterized by The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. The application relates to a battery management unit. 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