Battery management system, battery pack and vehicle

Abstract

The utility model relates to a battery management system, a battery pack and a vehicle, and is applied to the technical field of batteries. The battery management system comprises a control unit, a power supply chip and a switching device, the output end of the control unit is connected with the enabling end of the power supply chip through the switching device, the input end of the control unit is connected with the output end of the sampling device, and the output end of the power supply chip is connected with the input end of the sampling device. By adopting the method, the sampling equipment can be powered off and restarted when the sampling equipment is abnormal in sampling, and the use stability of a new energy product where the sampling equipment is located can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery management system, a battery pack, and a vehicle. Background Art

[0002] With the widespread application of new energy products, in order to ensure the stability of new energy products, sampling equipment on new energy products is an indispensable equipment. Based on the parameters sampled by the sampling equipment, the new energy products can be adaptively controlled to operate within the safe parameter operating range, thereby improving the stability of use.

[0003] However, if the sampling equipment malfunctions, the stability of new energy products will be reduced. Utility Model Content

[0004] Based on this, it is necessary to address the above technical issues and provide a battery management system, battery pack and vehicle that can improve the stability of the new energy products in which the sampling equipment is located.

[0005] In a first aspect, the present application provides a battery management system, which includes: a control unit, a power supply chip, and a switching device; the output end of the control unit is connected to the enable end of the power supply chip through the switching device, the input end of the control unit is connected to the output end of a sampling device, and the output end of the power supply chip is connected to the input end of the sampling device; wherein, the control unit controls the switching device to enable the power supply chip to supply power to the sampling device.

[0006] In the above embodiment, when the sampling device is sampling normally, the switching device is in the disconnected state, so that the power supply chip can supply power to the sampling device normally. When the sampling device is sampling abnormally, the control unit can stop the power supply chip from supplying power to the sampling device by controlling the switching device to close, and then when the switching device is disconnected, the power supply chip can supply power to the sampling device again. Therefore, the control unit can realize power-off restart of the sampling device by controlling the conduction or disconnection of the switching device, thereby improving the stability of the use of new energy products.

[0007] In one embodiment, the switching device includes a switching tube, a first end of the switching tube is connected to the output end of the control unit, a second end of the switching tube is connected to the enable end of the power supply chip, and a third end of the switching tube, a ground end of the control unit, and a ground end of the power supply chip are grounded.

[0008] In the above embodiment, by setting a switch tube, when the switch tube is turned on, the power supply chip stops supplying power to the sampling device, and when the switch tube is turned off, the power supply chip restarts to supply power to the sampling device. Therefore, the control unit can realize power-off restart of the sampling device by controlling the conduction or disconnection of the switch tube, thereby improving the stability of the use of new energy products.

[0009] In one embodiment, the switch tube is an NMOS transistor, the first end of the switch tube is the gate of the NMOS transistor, the second end of the switch tube is the drain of the NMOS transistor, and the third end of the switch tube is the source of the NMOS transistor.

[0010] In the above embodiment, by configuring the switch tube as an NMOS transistor, when the control unit outputs a high-level signal, the NMOS transistor is turned on based on the high-level signal, thereby reducing the voltage at the enable terminal of the power supply chip to shut off the power supply voltage output of the power supply chip. Furthermore, when the control unit outputs a low-level signal, the NMOS transistor is turned off based on the low-level signal, and the power supply chip can resume outputting the power supply voltage to the sampling device. Thus, by controlling the conduction or disconnection of the NMOS transistor, the control unit can achieve a power-off restart of the sampling device, thereby improving the operational stability of the new energy product.

[0011] In one embodiment, the switch tube is a PMOS transistor, the first end of the switch tube is the gate of the PMOS transistor, the second end of the switch tube is the source of the PMOS transistor, and the third end of the switch tube is the drain of the PMOS transistor.

[0012] In the above embodiment, by configuring the switch tube as a PMOS transistor, when the control unit outputs a low-level signal, the PMOS transistor is turned on based on the low-level signal, thereby reducing the voltage at the enable terminal of the power supply chip to shut off the power supply voltage output of the power supply chip. Furthermore, when the control unit outputs a high-level signal, the PMOS transistor is turned off based on the high-level signal, and the power supply chip can resume outputting the power supply voltage to the sampling device. Thus, by controlling the conduction or disconnection of the PMOS transistor, the control unit can achieve a power-off restart of the sampling device, thereby improving the operational stability of the new energy product.

[0013] In one embodiment, the control unit includes an analog-to-digital converter, and the input end of the control unit includes a first input end and a second input end of the analog-to-digital converter, the first input end of the analog-to-digital converter is connected to the output end of the sampling device, and the second input end of the analog-to-digital converter and the enable end of the power supply chip are connected to the first power supply.

[0014] In the above embodiment, an analog-to-digital converter is connected to the sampling device, so that the analog-to-digital converter can obtain the sampling parameters sampled by the sampling device by performing analog-to-digital conversion processing on the sampling signal sampled by the sampling device. Then, the analog-to-digital converter can send the sampling parameters to the control unit, so that the control unit can monitor and control the battery status based on the sampling parameters, thereby improving the safety of the battery of the new energy product.

[0015] In one embodiment, the battery management system further includes a current limiting device, which is connected between the first power supply and the enable terminal of the power supply chip, and the second end of the switch tube is connected between the current limiting device and the enable terminal of the power supply chip.

[0016] In the above embodiment, by providing a current limiting device between the first power supply and the enable terminal of the power supply chip, it is possible to avoid the situation where the current in the circuit is too large and the device is burned out, thereby improving the safety and stability of the battery management system.

[0017] In one embodiment, an input terminal of the power supply chip is connected to a second power source.

[0018] In the above embodiment, the power supply chip can be powered based on the second power supply so that the power supply chip can work normally. Furthermore, when the sampling device performs sampling abnormalities, the sampling device can be powered off and restarted based on the power supply chip, thereby improving the stability of the battery management system.

[0019] In one embodiment, the supply voltage output by the second power supply is greater than the supply voltage output by the first power supply, and the supply voltage output by the power supply chip to the sampling device is the same as the supply voltage output by the first power supply.

[0020] In the above embodiment, by setting the power supply voltage output by the power supply chip to the sampling device to be the same as the power supply voltage output by the first power supply, even if the power supply sent by the first power supply fluctuates, the sampling process of the sampling device is consistent with the power supply process of the power supply chip, thereby improving the stability of the sampling process.

[0021] In a second aspect, the present application provides a battery pack, comprising the battery management system and sampling device according to the first aspect or any one of the first aspects.

[0022] In one embodiment, the sampling device includes: a current sensor or a voltage sensor.

[0023] In one embodiment, the current sensor is a Hall current sensor.

[0024] In a third aspect, the present application provides a vehicle comprising the battery pack according to the second aspect or any one of the second aspects.

[0025] In the above-mentioned battery management system, battery pack and vehicle, when the sampling device is sampling normally, the switching device is in the disconnected state, so that the power supply chip can supply power to the sampling device normally. When the sampling device is sampling abnormally, the control unit can stop the power supply chip from supplying power to the sampling device by controlling the switching device to close, and then when the switching device is controlled to disconnect, the power supply chip can supply power to the sampling device again. Therefore, the control unit can realize power-off restart of the sampling device by controlling the conduction or disconnection of the switching device, thereby improving the stability of the use of new energy products. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a structural block diagram of a battery management system in one embodiment;

[0028] Figure 2 is a structural block diagram of a battery management system in another embodiment;

[0029] Figure 3 is a structural block diagram of a battery management system in another embodiment;

[0030] Figure 4 is a structural block diagram of a battery management system in another embodiment;

[0031] Figure 5 is a structural block diagram of a battery management system in another embodiment;

[0032] Figure 6 is a structural block diagram of a battery management system in one embodiment;

[0033] Figure 7 is a schematic structural diagram of a battery pack in one embodiment;

[0034] Figure 8 FIG. 4 is a flow chart of a battery control method in one embodiment. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may 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 refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0039] When designing new energy products, in order to reduce the impact of power supply jitter on power supply accuracy, the sampling device and processor in the new energy product are usually configured to use the same power supply. Therefore, when designing new energy products, the focus is on how to configure the same power supply to power the sampling device and the processor at the same time. However, this ignores the fact that when the sampling device samples abnormally, even if the power supply powers the sampling device, the sampling device cannot sample normally. The sampling device does not have a power-off and restart function when sampling abnormally, which will cause the sampling device to be in a faulty state and unable to sample.

[0040] For example, if a new energy product is a new energy electric vehicle and the sampling device is a current sensor, the current sensor can be configured during vehicle design to detect the current in the battery pack circuit. To reduce the impact of power supply jitter on power supply accuracy, the vehicle's control unit and current sensor can be configured to use the same power supply. Similarly, if the current sensor sampling is abnormal, the current sensor will not be able to automatically power off and restart.

[0041] In view of this, if Figure 1As shown, the present application provides a block diagram of a battery management system. The battery management system 100 includes a control unit 102, a power supply chip 104, and a switch device 106. The output of the control unit 102 is connected to the enable terminal of the power supply chip 104 via the switch device 106. The input of the control unit 102 is connected to the output of the sampling device 200, and the output of the power supply chip 104 is connected to the input of the sampling device 200. The control unit 102 controls the switch device 106 to cause the power supply chip 104 to supply power to the sampling device 200. Consequently, the power supply chip 104 can supply power to the sampling device 200, and the sampling device 200 can send a detected sampling signal to the control unit 102. The control unit 102 performs analog-to-digital conversion on the sampling signal to obtain the sampling parameters detected by the sampling device 200. The control unit 102 controls the power supply chip 104 to the sampling device 200 via the switch device 106. Thus, by controlling the switching device to be turned on or off, the control unit can restart the sampling device, improving the stability of the new energy product.

[0042] In some embodiments, the sampling device is a device that detects a sampled parameter on a battery pack circuit. The sampling device may include a current sensor or a voltage sensor. For example, if the sampling device is a current sensor, the sampled parameter refers to current; if the sampling device is a voltage sensor, the sampled parameter refers to voltage.

[0043] In some embodiments, the control unit 102 may be implemented by any control chip or central processing unit that can implement a control function, including but not limited to a microcontroller unit (MCU) chip, a central processing unit (CPU), and the like.

[0044] A current sensor is a device used to detect and measure current, including but not limited to Hall effect current sensors, fluxgate current sensors, or Rogowski coil current sensors. A voltage sensor is a device used to detect and measure voltage, including but not limited to resistive voltage sensors, capacitive voltage sensors, inductive voltage sensors, thermistor voltage sensors, and relay voltage sensors.

[0045] It should be understood that when the current sensor is a Hall current sensor, when the measured current flows through the wire in the Hall current sensor, a magnetic field is generated around it. This magnetic field acts on the Hall element integrated in the Hall current sensor, thereby generating an electromotive force signal. The signal is amplified and output as a voltage. Therefore, the Hall current sensor outputs a sampling signal for representing the voltage. The control unit 102 performs analog-to-digital conversion on the sampling signal to obtain a voltage, that is, the sampling parameter sampled by the Hall current sensor is voltage.

[0046] In some cases, when the sampling device 200 is sampling normally, the switch device 106 is in an off state, so that the power supply chip 104 can realize the power supply process for the sampling device 200 by outputting a power supply voltage to the sampling device 200 .

[0047] In some cases, when sampling device 200 experiences sampling anomalies, control unit 102 may output a first control signal to switch device 106 to close switch device 106. When switch device 106 is closed, the voltage at the enable terminal of power supply chip 104 is reduced to shut off the output of the power supply voltage from power supply chip 104, thereby stopping power supply from power supply chip 104 to sampling device 200. After power supply is stopped, control unit 102 outputs a second control signal to switch device 106 to open switch device 106. Power supply chip 104 can then resume supplying the power supply voltage to sampling device 200, thus powering off and restarting sampling device 200. That is, when sampling device 200 experiences sampling anomalies, the second control signal can be used to reset sampling device 200.

[0048] Among them, when the switching devices are different, the meanings of the first control signal and the second control signal are different, which can be set according to the actual application scenario and are not specifically limited in this embodiment.

[0049] The control unit 102 may adopt various possible implementations to determine whether the sampling device 200 has sampling abnormality. Several possible implementations are exemplarily described below.

[0050] In one implementation, the battery management system 100 may further include a preset sampling device, wherein the sampling accuracy of the preset sampling device is greater than the sampling accuracy of the sampling device 200, and the sampling positions of the preset sampling device and the sampling device 200 are consistent. Thus, the control unit 102 may obtain target sampling parameters based on the preset sampling device, and determine that sampling by the sampling device 200 is abnormal when the parameter difference between the target sampling parameter and the sampling parameter sampled by the sampling device 200 is outside a preset range and persists for longer than a first preset duration. When the parameter difference between the target sampling parameter and the sampling parameter is within a preset range and persists for longer than a second preset duration, the sampling by the sampling device 200 is determined to be normal.

[0051] Among them, the reasons for abnormal sampling of the sampling device 200 may include: partial damage to internal components of the sampling device, environmental factors (such as mechanical vibration, corrosion, electromagnetic interference and noise, etc.), unstable power supply or poor power supply quality of the sampling device, and long usage time of the sampling device.

[0052] Among them, the first preset time length and the second preset time length can be the same or different. The specific values ​​of the first preset time length and the second preset time length can be set based on the actual application scenario, and this embodiment does not make specific limitations.

[0053] In another implementation, when the control unit 102 does not receive a sampling signal from the sampling device 200 within a third preset time period, it determines that sampling by the sampling device 200 is abnormal. The specific value of the third preset time period can be set based on actual application scenarios and is not specifically limited in this embodiment.

[0054] It should be understood that after the sampling device 200 samples and obtains the sampling signal, it will send the sampling signal to the control unit 102 immediately or within the third preset time length, and the fourth preset time length is less than the third preset time length; when the control unit 102 does not receive the sampling signal within the third preset time length, it means that the sampling device 200 has not started the sampling process due to its own fault. Therefore, the control unit 102 can determine that the sampling of the sampling device 200 is abnormal.

[0055] In another implementation, when the control unit 102 determines that the zero drift of the sampling device 200 is too large, it determines that the sampling device 200 has a sampling abnormality. The zero drift of the sampling device refers to a slight drift in the current or voltage at the output of the circuit due to factors such as temperature changes and unstable power supply voltage in the absence of an input signal.

[0056] In some cases, the sampling device 200 is deployed on a high-voltage bus. Theoretically, when the vehicle is in a dormant state, there is no high-voltage input on the high-voltage bus. At this time, the sampling parameter of the sampling device 200 is a preset value, which is used to characterize the value when the sampling device 200 does not have zero drift. When the vehicle is in a dormant state, if the detected sampling parameter is inconsistent with the preset value, it is determined that the sampling device 200 has zero drift, and then when the difference between the sampling parameter and the preset value is outside the preset range, it is determined that the zero drift of the sampling device 200 is too large.

[0057] In one embodiment, the switch device 106 includes a switch tube 1061, such as Figure 2 As shown, a first end of the switch 1061 is connected to the output end of the control unit 102, a second end of the switch 1061 is connected to the enable end of the power supply chip 104, and a third end of the switch 1061, a ground end of the control unit 102, and a ground end of the power supply chip 104 are grounded. Thus, by providing the switch, when the switch is on, the power supply chip can stop supplying power to the sampling device, and when the switch is off, the power supply chip can resume supplying power to the sampling device. Thus, by controlling the on / off state of the switch, the control unit can power the sampling device off and on, thereby improving the stability of the new energy product.

[0058] In some cases, the switch tube can be an N-type metal-oxide-semiconductor (NMOS) transistor, in which case the first end of the switch tube is the gate of the NMOS transistor, the second end of the switch tube is the drain of the NMOS transistor, and the third end of the switch tube is the source of the NMOS transistor.

[0059] When the switch tube can be an NMOS transistor, the first control signal can be a high-level signal. Based on the high-level signal, the NMOS transistor can be turned on, and the voltage at the enable terminal of the power supply chip 104 can be reduced to shut down the output of the power supply voltage of the power supply chip 104, thereby stopping the power supply chip 104 from supplying power to the sampling device 200. The second control signal can be a low-level signal. Based on the low-level signal, the NMOS transistor can be turned off, and the power supply chip 104 can resume outputting the power supply voltage to the sampling device 200, thus achieving a power-off restart of the sampling device 200 and improving the operational stability of the new energy product.

[0060] In some cases, the switch tube may be a P-channel metal oxide semiconductor (PMOS) transistor, in which case the first end of the switch tube is the gate of the PMOS transistor, the second end of the switch tube is the source of the PMOS transistor, and the third end of the switch tube is the drain of the PMOS transistor.

[0061] When the switch tube can be a PMOS transistor, the first control signal can be a low-level signal. Based on the low-level signal, the PMOS transistor can be turned on, which can reduce the voltage at the enable terminal of the power supply chip 104 to shut down the output of the power supply voltage of the power supply chip 104, thereby stopping the power supply chip 104 from supplying power to the sampling device 200. The second control signal can be a high-level signal. Based on the high-level signal, the PMOS transistor can be turned off, and the power supply chip 104 can resume supplying the power supply voltage to the sampling device 200, thus achieving a power-off restart of the sampling device 200 and improving the operational stability of the new energy product.

[0062] In one embodiment, Figure 2 On the basis of Figure 3 As shown, the control unit 102 includes an analog-to-digital converter (ADC) 1021. The input terminals of the control unit 102 include a first input terminal and a second input terminal of the ADC 1021. The first input terminal of the ADC 1021 is connected to the output terminal of the sampling device 200. The second input terminal of the ADC 1021 and the enable terminal of the power supply chip 104 are connected to the first power supply 302. Thus, the first power supply 302 can supply power to the ADC 1021 to provide the reference voltage (VRef) required for the ADC 1021 to perform analog-to-digital conversion. The first power supply 302 is connected to the enable terminal of the power supply chip 104, so that the power supply voltage output by the power supply chip 104 to the sampling device 200 can be adjusted based on the power supply voltage output by the first power supply 302. Moreover, the sampling signal detected by the sampling device 200 can be sent to the analog-to-digital converter 1021. The analog-to-digital converter 1021 can obtain the sampling parameters sampled by the sampling device 200 by performing analog-to-digital conversion on the sampling signal. Furthermore, the analog-to-digital converter 1021 can send the sampling parameters to the control unit 102, so that the control unit can monitor and control the battery status based on the sampling parameters, thereby improving the safety of the battery of new energy products.

[0063] In some cases, because the enable terminals of the analog-to-digital converter 1021 and the power supply chip 104 are both connected to the first power supply 302, when power jitter occurs in the first power supply 302, the reference voltage output by the first power supply 302 to the analog-to-digital converter 1021 will change synchronously, and the power supply voltage output by the power supply chip 104 to the sampling device 200 will also change synchronously. Therefore, when the power supply chip 104 supplies power to the sampling device 200, the sampling process of the sampling device 200 will be affected. However, the sampling process of the sampling device 200 and the reference voltage of the analog-to-digital converter 1021 will change synchronously due to the power jitter. Therefore, when the analog-to-digital converter 1021 performs analog-to-digital conversion on the sampling signal detected by the sampling device 200 based on the changed reference voltage to obtain sampling parameters, its processing process matches the actual sampling process of the sampling device 200, which can improve the accuracy of the obtained sampling parameters.

[0064] In one embodiment, the battery management system 100 further includes a current limiting device connected between the first power source 302 and the enable terminal of the power supply chip 104. The second terminal of the switch 1061 is connected between the current limiting device and the enable terminal of the power supply chip 104. Thus, by providing the current limiting device, it is possible to prevent excessive current in the circuit from burning out components, thereby improving the safety and stability of the battery management system.

[0065] The current limiting device may include, but is not limited to, a superconducting current limiter, a magnetic element current limiter, a solid-state current limiter, or a resistor. Therefore, when the current limiting device is a superconducting current limiter, the current limiting can be achieved by utilizing the properties of the superconducting material; when the current limiting device is a magnetic element current limiter, the magnetic element can be used to regulate the current; when the current limiting device is a solid-state current limiter, including a power electronic current limiter, a semiconductor device can be used instead of a switching device to achieve current limiting impedance switching; when the current limiting device is a resistor, the resistor can be used to achieve current limiting.

[0066] exist Figure 3 Based on the above, taking the current limiting device as a resistor as an example, Figure 4 As shown, the battery management system 100 further includes a resistor 402, which is connected between the first power source 302 and the enable terminal of the power supply chip 104. The second end of the switch tube 1061 is connected between the resistor 402 and the enable terminal of the power supply chip 104. Therefore, by providing the resistor 402, the situation in which excessive current in the circuit may burn out the components can be avoided, thereby improving the safety and stability of the battery management system.

[0067] In one embodiment, Figure 4 As shown on the basis of Figure 5As shown, the input end of the power supply chip 104 is connected to the second power supply 502, so that the power supply chip 104 can be powered by the second power supply 502. Furthermore, the power supply chip 104 can power the sampling device 200 based on the power supply voltage output by the second power supply 502. Furthermore, when the sampling device performs sampling abnormalities, the sampling device can be powered off and restarted based on the power supply chip, thereby improving the stability of the battery management system.

[0068] In some cases, the supply voltage output by the second power supply 502 is greater than the supply voltage output by the first power supply 302, and the supply voltage output by the power supply chip 104 to the sampling device 200 is the same as the supply voltage output by the first power supply 302. Therefore, by setting the supply voltage output by the power supply chip 104 to the sampling device 200 to be the same as the supply voltage output by the first power supply 302, even if the first power supply 302 generates power jitter, the sampling process of the sampling device 200 remains consistent with the power supply process of the power supply chip, thereby improving the stability of the sampling process.

[0069] In combination with the above, in one embodiment, Figure 6 , a structural block diagram of a battery pack is provided, wherein the battery pack 600 includes a battery management system 602 and a sampling device 200. The battery management system 602 is used to supply power to the sampling device 200. The sampling device 200 is used to output a sampling signal to the battery management system 602 after sampling the battery pack, so that the battery management system 602 performs analog-to-digital conversion on the sampling signal to obtain sampling parameters related to the battery pack 600 detected by the sampling device 200.

[0070] In combination with the above content, taking the sampling device 200 as a Hall current sensor 2001 and the switch tube 1061 as an NMOS transistor as an example, Figure 7 , a schematic diagram of the structure of a battery pack is provided, wherein the battery pack 600 includes: a control unit 102 , a power supply chip 104 , a switch tube 1061 and a resistor 402 . The control unit 102 includes an analog-to-digital converter 1021 .

[0071] The gate of the NMOS transistor is connected to the output of the control unit 102, the drain of the NMOS transistor is connected to the enable terminal of the power supply chip 104, and the source of the NMOS transistor, the ground of the control unit 102, and the ground of the power supply chip 104 are grounded. A first input of the analog-to-digital converter 1021 is connected to the output of the Hall current sensor 2001, an input of the Hall current sensor 2001 is connected to the output of the power supply chip 104, an input of the power supply chip 104 is connected to the second power supply 502, a second input of the analog-to-digital converter 1021 and the enable terminal of the power supply chip 104 are connected to the first power supply 302, a resistor 402 is connected between the first power supply 302 and the enable terminal (i.e., ADJ / EN terminal) of the power supply chip 104, and a drain of the NMOS transistor is connected between the resistor 402 and the enable terminal of the power supply chip 104.

[0072] exist Figure 7 In the embodiment, the first power supply 302 is used to supply power to the analog-to-digital converter 1021, thereby outputting a reference voltage required for analog-to-digital conversion to the analog-to-digital converter 1021. The reference voltage is the same as the supply voltage V2 output by the first power supply 302. The first power supply 302 is connected to the enable terminal of the power supply chip 104 via a resistor 402, so that the supply voltage V3 output by the power supply chip 104 to the Hall current sensor 2001 can be adjusted based on the supply voltage V2 output by the first power supply 302. The second power supply 502 is used to supply power to the power supply chip 104, so that the power supply chip 104 outputs the supply voltage V3 to the Hall current sensor 2001 based on the supply voltage V1 output by the second power supply 502, thereby providing power to the Hall current sensor 2001.

[0073] In this case, the supply voltage V1 is greater than the supply voltage V3, and the supply voltage V3 is the same as the supply voltage V2. By setting the supply voltage V2 and the supply voltage V3 to be the same, even if the first power supply 302 experiences power jitter, because the enable terminals of the analog-to-digital converter 1021 and the power supply chip 104 are both connected to the first power supply 302, the reference voltage output by the first power supply 302 to the analog-to-digital converter 1021 will change synchronously, and the supply voltage V3 output by the power supply chip 104 to the Hall current sensor 2001 will also change synchronously. When the analog-to-digital converter 1021 performs analog-to-digital conversion processing on the sampling signal detected by the sampling device 200 based on the changing reference voltage to obtain sampling parameters, its processing process matches the actual sampling process of the sampling device 200, thereby improving the accuracy of the obtained sampling parameters.

[0074] When Hall current sensor 2001 is sampling normally and the NMOS transistor is off, power supply chip 104 can normally output supply voltage V3 to Hall current sensor 2001 to power it, allowing Hall current sensor 2001 to perform sampling. If Hall current sensor 2001 is sampling abnormally, control unit 102 can output a high-level signal to the NMOS transistor to turn it on. When the NMOS transistor is on, the output of supply voltage V3 can be turned off by reducing the voltage at the enable terminal of power supply chip 104, thereby stopping power supply chip 104 from supplying power to Hall current sensor 2001. After the power supply is stopped for a set period of time, control unit 102 can output a low-level signal to the NMOS transistor to turn it off. When the NMOS transistor is off, power supply chip 104 can resume outputting supply voltage V3 to sampling device 200 to power it, thereby resetting Hall current sensor 2001. Alternatively, after stopping power supply for a set period of time, the power supply chip 104 may again output the supply voltage V3 to the sampling device 200 for powering.

[0075] In combination with the above, in one embodiment, Figure 8 As shown, a battery control method is provided, which is described by taking the application of the method to a battery management system as an example, and includes the following steps:

[0076] S802: Acquire a sampling signal from a sampling device.

[0077] When the power supply chip outputs power to the sampling device to power the sampling device, the sampling device can detect the battery pack to obtain a sampling signal. In some cases, the sampling signal can represent a current or voltage signal.

[0078] S804: Perform analog-to-digital conversion on the sampled signal to obtain sampling parameters of the sampling device.

[0079] In some embodiments, the battery management system includes a control unit, and the control unit performs analog-to-digital conversion on the sampling signal to obtain sampling parameters of the sampling device.

[0080] In some embodiments, the battery management system includes an analog-to-digital converter provided in the control unit. The sampling parameters sampled by the sampling device can be obtained by performing analog-to-digital conversion processing on the sampling signal based on the analog-to-digital converter.

[0081] S806: Determine whether the sampling device has sampling abnormality based on the sampling parameters.

[0082] If it is determined based on the sampling parameters that the sampling device is sampling normally, the process returns to S802 ; if it is determined based on the sampling parameters that the sampling device is sampling abnormally, the process executes S808 .

[0083] In some embodiments, target sampling parameters are obtained based on a preset sampling device; when the parameter difference between the target sampling parameters and the sampling parameters is outside a preset range and lasts for more than a first preset time, it is determined that the sampling of the sampling device is abnormal; when the parameter difference between the target sampling parameters and the sampling parameters is within a preset range and lasts for more than a second preset time, it is determined that the sampling of the sampling device is normal.

[0084] In some embodiments, when the control unit determines that the zero drift of the sampling device is too large, it determines that the sampling of the sampling device is abnormal.

[0085] S808 , outputting a first control signal to the switch device to close the switch device and causing the power supply chip to stop supplying power to the sampling device.

[0086] In some embodiments, the switching device includes an NMOS transistor, and the first control signal can be a high-level signal. Based on the high-level signal, the NMOS transistor can be turned on, and the voltage of the enable terminal of the power supply chip can be reduced to shut off the output of the power supply voltage of the power supply chip, thereby realizing the process of the power supply chip stopping powering the sampling device.

[0087] In some embodiments, the switching device includes a PMOS transistor, and the first control signal can be a low-level signal. Based on the low-level signal, the PMOS transistor can be turned on, and the voltage of the enable terminal of the power supply chip can be reduced to shut off the output of the power supply voltage of the power supply chip, thereby realizing the process of the power supply chip stopping powering the sampling device.

[0088] S810 : When the duration for which the power supply chip stops supplying power to the sampling device reaches a set duration, a second control signal is sent to the switch device to enable the power supply chip to supply power to the sampling device again.

[0089] In some embodiments, the switching device includes an NMOS transistor, and the second control signal can be a low-level signal. Based on the low-level signal, the NMOS transistor can be disconnected, and the power supply chip can output the power supply voltage to the sampling device again, thereby realizing power-off restart of the sampling device.

[0090] In some embodiments, the switching device includes a PMOS transistor, and the second control signal can be a high-level signal. Based on the high-level signal, the PMOS transistor can be disconnected, and the power supply chip can output the power supply voltage to the sampling device again, thereby realizing power-off restart of the sampling device.

[0091] based on Figure 8The content of the illustrated embodiment can determine whether the sampling device has sampling abnormalities based on the sampling parameters sampled by the sampling device. Therefore, when the sampling device has sampling abnormalities, the power supply chip can stop supplying power to the sampling device by controlling the switch device to close, and then when the switch device is disconnected, the power supply chip can supply power to the sampling device again. Therefore, by controlling the conduction or disconnection of the switch device, the sampling device can be powered on and restarted, thereby improving the stability of the use of new energy products.

[0092] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A battery management system, characterized in that: The battery management system includes: a control unit, a power supply chip and a switch device; The output end of the control unit is connected to the enable end of the power supply chip through the switch device, the input end of the control unit is connected to the output end of the sampling device, and the output end of the power supply chip is connected to the input end of the sampling device; The control unit controls the switch device to enable the power supply chip to supply power to the sampling device.

2. The battery management system according to claim 1, characterized in that: The switching device includes a switching tube, a first end of the switching tube is connected to the output end of the control unit, a second end of the switching tube is connected to the enable end of the power supply chip, and a third end of the switching tube, a ground end of the control unit, and a ground end of the power supply chip are grounded.

3. The battery management system according to claim 2, characterized in that: The switch tube is an NMOS transistor, the first end of the switch tube is the gate of the NMOS transistor, the second end of the switch tube is the drain of the NMOS transistor, and the third end of the switch tube is the source of the NMOS transistor.

4. The battery management system according to claim 2, characterized in that: The switch tube is a PMOS transistor, the first end of the switch tube is the gate of the PMOS transistor, the second end of the switch tube is the source of the PMOS transistor, and the third end of the switch tube is the drain of the PMOS transistor.

5. The battery management system according to any one of claims 2 to 4, characterized in that: The control unit includes an analog-to-digital converter, and the input end of the control unit includes a first input end and a second input end of the analog-to-digital converter, the first input end of the analog-to-digital converter is connected to the output end of the sampling device, and the second input end of the analog-to-digital converter and the enable end of the power supply chip are connected to the first power supply.

6. The battery management system according to claim 5, characterized in that: The battery management system further includes a current limiting device connected between the first power source and the enable terminal of the power supply chip, and the second end of the switch tube is connected between the current limiting device and the enable terminal of the power supply chip.

7. The battery management system according to claim 6, characterized in that: The input end of the power supply chip is connected to the second power supply.

8. The battery management system according to claim 7, characterized in that: The supply voltage output by the second power supply is greater than the supply voltage output by the first power supply, and the supply voltage output by the power supply chip to the sampling device is the same as the supply voltage output by the first power supply.

9. A battery pack, characterized in that: The battery pack includes a battery management system and a sampling device according to any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that: The sampling device includes: a current sensor or a voltage sensor.

11. The battery pack according to claim 10, wherein: The current sensor is a Hall current sensor.

12. A vehicle, characterized in that: The vehicle includes the battery pack according to any one of claims 9 to 11.

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