Power supply device, battery management device and method thereof, battery system and power consuming device

Abstract

The application relates to a power supply device, a battery management device and a method thereof, a battery system and a power consumption device, and belongs to the field of electronic circuits. The power supply device comprises a first power supply and a second power supply; the first power supply and the second power supply are configured to be electrically connected with a power supply chip and supply power to the power supply chip. The output voltage of the first power supply is smaller than the output voltage of the second power supply, and the first power supply and the second power supply satisfy at least any one of the following conditions: i) when the second power supply supplies power to the power supply chip, the first power supply is in a sleep mode; ii) the first power supply is woken up in response to a failure of the second power supply and supplies power to the power supply chip.

Description

Technical Field

[0001] This application belongs to the field of electronic circuits, specifically relating to a power supply device, a battery management device and method thereof, a battery system and an electrical device. Background Technology

[0002] Currently, in high-voltage energy storage systems, when the system is off-grid, the internal working modules can be powered by auxiliary power sources (such as internal batteries). However, this continuously consumes the auxiliary power source's energy, reducing its lifespan. To improve the lifespan of the auxiliary power source, it is implemented using replaceable components for easy maintenance and replacement, or a redundant backup power supply scheme is adopted, i.e., using two auxiliary power sources. Summary of the Invention

[0003] Therefore, the purpose of this application is to provide a power supply device, a battery management device and method thereof, a battery system and an electrical device to improve the service life of the auxiliary power supply.

[0004] In a first aspect, embodiments of this application provide a power supply device, including: a first power supply and a second power supply. The first power supply is configured to be electrically connected to a power chip and supply power to the power chip, and the second power supply is configured to be electrically connected to the power chip and supply power to the power chip. The output voltage of the first power supply is less than the output voltage of the second power supply, and the first power supply and the second power supply satisfy at least one of the following conditions: i) when the second power supply supplies power to the power chip, the first power supply is in a sleep mode; ii) the first power supply is awakened in response to a fault in the second power supply and supplies power to the power chip.

[0005] In this embodiment, the output voltage of the first power supply is lower than the output voltage of the second power supply. When both the first and second power supplies power the power chip, the second power supply wins the competition for power supply with the first power supply and supplies power to the power chip. While the second power supply is supplying power to the power chip, the first power supply is in a sleep mode instead of being in an operating state. This reduces the power consumption of the first power supply and extends its lifespan. When the second power supply fails, the first power supply is woken up to supply power to the power chip, ensuring the power chip remains operational and thus enhancing power supply reliability.

[0006] One embodiment in conjunction with the first aspect is as follows: The first power supply includes a flyback controller. The second power supply includes a DC / DC converter and a first transformer, the DC / DC converter being electrically connected to the primary side of the first transformer, and the secondary side of the first transformer being configured to be electrically connected to the power chip; or, the second power supply includes an AC / DC converter and a second transformer, the AC / DC converter being electrically connected to the primary side of the second transformer, and the secondary side of the second transformer being configured to be electrically connected to the power chip.

[0007] In this embodiment, the first power supply is implemented using a flyback controller. By adjusting the frequency of the flyback controller, the first power supply can be controlled to be in a sleep state or a wake-up state (the first power supply starts working after being woken up and can supply power to the power chip), thereby enabling the switching of the first power supply's state. The second power supply is implemented using a DC / DC converter or an AC / DC converter, which enhances the applicability of the solution while achieving its inventive purpose.

[0008] In one embodiment of the first aspect, the second power supply includes a DC / DC converter, a first transformer, and a first switch. A first terminal of the first switch is configured to be electrically connected to the positive terminal of the battery module, a second terminal of the first switch is electrically connected to the DC / DC converter, and a control terminal of the first switch is configured to receive a drive signal, the drive signal being used to instruct the first switch to perform on or off operations.

[0009] In this embodiment of the application, a controlled first switch is added between the positive terminal of the battery module and the DC / DC converter, thereby enhancing the safety of the second power supply.

[0010] Secondly, embodiments of this application also provide a battery management device, including the aforementioned power supply device, further comprising: a power chip, a second switch, a microcontroller, and a latch. The power supply terminal of the power chip is electrically connected to its enable terminal via the second switch. The power supply terminal of the power chip is also electrically connected to the output terminals of the first and second power supplies, respectively. The voltage output terminal of the power chip is electrically connected to the microcontroller, and the microcontroller is electrically connected to the enable terminal of the power chip via the latch.

[0011] In this embodiment of the invention, the battery management device with the above-described structure can meet the power-on and power-off requirements of the power chip and the requirements for battery management, thereby achieving the purpose of the invention while reducing costs and the complexity of the solution.

[0012] In one embodiment of the second aspect, the second switch is a tactile switch.

[0013] In this embodiment of the application, a tactile switch is selected, which can reduce costs and complexity of the solution while achieving the purpose of the invention, and is conducive to increasing the applicability of the solution.

[0014] In one embodiment of the second aspect, the circuit further includes: a first voltage divider branch and / or a second voltage divider branch. The first voltage divider branch includes at least two resistors connected in series, the at least two resistors connected in series between the output terminal of the first power supply and ground, and a first node between the at least two resistors connected in series is electrically connected to the microcontroller. The second voltage divider branch includes at least two resistors connected in series, the at least two resistors connected in series between the output terminal of the second power supply and ground, and a second node between the at least two resistors connected in series is electrically connected to the microcontroller.

[0015] In this embodiment, the microcontroller uses a first voltage divider branch to detect the output voltage of the first power supply, and / or uses a second voltage divider branch to detect the output voltage of the second power supply. This allows the microcontroller to detect any abnormalities in the first power supply and / or the second power supply, facilitating timely adjustment of control measures.

[0016] In one embodiment of the second aspect, the device further includes: a first unidirectional conduction device and / or a second unidirectional conduction device. The first unidirectional conduction device has its output terminal electrically connected to a first terminal, and its second terminal electrically connected to a power supply terminal of the power chip. The second unidirectional conduction device has its output terminal electrically connected to a first terminal, and its second terminal electrically connected to a power supply terminal of the power chip.

[0017] In this embodiment of the application, a first unidirectional conduction device is added between the first power supply and the power terminal of the power chip, and / or a second unidirectional conduction device is added between the second power supply and the power terminal of the power chip, so that the first power supply and the second power supply are isolated from each other and avoid mutual interference.

[0018] In one embodiment of the second aspect, the power supply device includes a DC / DC converter, a first transformer, and a first switch. A first terminal of the first switch is configured to be electrically connected to the positive terminal of a battery module, and a second terminal of the first switch is electrically connected to the DC / DC converter. The battery management device further includes an isolation drive module. The isolation drive module is electrically connected to the control terminals of the microcontroller and the first switch, respectively. The isolation drive module is configured to receive a control signal and output a drive signal to the control terminal of the first switch to drive the first switch to perform on or off operations.

[0019] In this embodiment, an isolation driver module is added to transmit the control signal sent by the microcontroller, driving the first switch to perform on or off operations.

[0020] In one embodiment of the second aspect, the device further includes a third unidirectional conduction device. A first end of the third unidirectional conduction device is connected to the output terminal of the second power supply, and a second end of the third unidirectional conduction device is electrically connected to the enable terminal of the power chip.

[0021] In this embodiment of the application, a third unidirectional conduction device is added between the output terminal of the second power supply and the enable terminal of the power chip to prevent the signal of the enable terminal of the power chip from being fed back into the second power supply.

[0022] In one embodiment of the second aspect, the device further includes a fourth unidirectional conduction device. A first terminal of the fourth unidirectional conduction device is electrically connected to a latch, and a second terminal of the fourth unidirectional conduction device is electrically connected to the enable terminal of the power chip.

[0023] In this embodiment, a fourth unidirectional conduction device is added between the latch and the enable terminal of the power chip to prevent the signal from the enable terminal of the power chip from flowing back into the latch.

[0024] Thirdly, embodiments of this application also provide a battery system, including: a battery module and a battery management device as described above. The battery module is electrically connected to the battery management device, and the battery management device is used to control the charging and / or discharging of the battery module.

[0025] In one embodiment of the third aspect, the second power supply includes an AC / DC converter and a second transformer. The AC / DC converter is configured to be electrically connected to an external AC power source.

[0026] In one embodiment of the third aspect, the second power supply includes: a DC / DC converter, a first transformer, and a first switch. A first terminal of the first switch is electrically connected to the positive terminal of the battery module, and a second terminal of the first switch is electrically connected to the DC / DC converter. The input terminal of the DC / DC converter is electrically connected to the positive terminal of the battery module via the first switch.

[0027] Fourthly, embodiments of this application also provide an electrical device, including: a load and the aforementioned battery system, wherein the battery system supplies power to the load.

[0028] Fifthly, embodiments of this application also provide a battery management device power supply method, applied to the battery system as described above, comprising the following steps: Step S1: In response to the operation of pressing the second switch, the power chip operates and supplies power to the microcontroller; Step S2: i) In response to the battery system receiving an external AC power supply, the external AC power supply supplies power to the power chip through the AC / DC converter and the second transformer of the second power supply, and the power chip operates and supplies power to the microcontroller; or, ii) the battery module supplies power to the power chip through the DC / DC converter, the first transformer and the first switch of the second power supply, and the power chip operates and supplies power to the microcontroller.

[0029] In one embodiment of the fifth aspect, the method further includes: step S3: the microcontroller operates and controls the latch to latch the signal at the enable terminal of the power chip to an effective level, the effective level being used to indicate that the power chip maintains its operating state.

[0030] In one possible implementation of the fifth aspect embodiment, it further includes: step S4: the first power supply is in a sleep state; step S5: in response to an abnormality in the second power supply, the first power supply is woken up and enters a working state, and the first power supply supplies power to the power chip.

[0031] In one embodiment of the fifth aspect, the method further includes: step S6: in response to the power-down of the battery system, the microcontroller controls the latch to latch the signal at the enable terminal of the power chip to an invalid level, the invalid level being used to indicate that the power chip is powered down. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be described in detail below. Obviously, the drawings described below are only some embodiments of this application. The above and other objects, features, and advantages of this application will become clearer through the accompanying drawings.

[0033] Figure 1 This illustration shows a schematic diagram of a power supply device connected to a power chip according to an embodiment of this application.

[0034] Figure 2 A schematic diagram of a first power supply provided in an embodiment of this application is shown.

[0035] Figure 3 A schematic diagram of the first type of second power supply provided in an embodiment of this application is shown.

[0036] Figure 4A schematic diagram of the principle of the second power source provided in the embodiments of this application is shown.

[0037] Figure 5 A schematic diagram of the principle of the third second power source provided in the embodiments of this application is shown.

[0038] Figure 6 A schematic diagram of the structure of a battery management device provided in an embodiment of this application is shown.

[0039] Figure 7 A schematic diagram of a battery management device provided in an embodiment of this application is shown.

[0040] Figure 8 A schematic flowchart of a power supply method for a battery management device provided in an embodiment of this application is shown. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following embodiments are provided as examples to more clearly illustrate the technical solutions of this application, and should not be used to limit the scope of protection of this application. Those skilled in the art will understand that, without conflict, the following embodiments and features can be combined with each other.

[0042] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "electrical connection" can refer to a direct electrical connection or an indirect electrical connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances. In the absence of a specified order, the steps or methods in the embodiments of this application can be understood as not implying a strict execution order and thus not constituting any limitation on the implementation process. Sometimes two consecutive steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order. The specific execution order of each step should be determined by its function and possible internal logic.

[0044] Given the shortcomings of the two current solutions for improving the lifespan of auxiliary power supplies—for example, the solution using replaceable components for the auxiliary power supply results in high maintenance costs due to the dispersed installation of the system, while the redundant backup power supply solution, where both auxiliary power supplies are constantly in operation, although this can mitigate the problem of random auxiliary power supply failures, does not extend their lifespan—this approach addresses these issues.

[0045] To improve the lifespan of power supplies, such as auxiliary power supplies, embodiments of this application provide a power supply device that allows another power supply, such as an auxiliary power supply, to enter a sleep mode when one power supply is supplying power to the load or when the load is powered off. This not only extends the lifespan of the auxiliary power supply but also reduces its power consumption and improves its reliability.

[0046] Combination Figure 1 The power supply device includes a first power supply and a second power supply. In some specific implementations of this application, the first power supply and the second power supply can be disposed on the same circuit board. Both the first power supply and the second power supply are configured to be electrically connected to and supply power to the electrical load. For example, the electrical load can be a power supply chip, and both the first power supply and the second power supply are configured to be electrically connected to and supply power to the power supply chip.

[0047] The output voltage of the first power supply is lower than the output voltage of the second power supply. For example, the output voltage of the first power supply can be 11.5V, and the output voltage of the second power supply can be 13.5V. The output voltages of the first and second power supplies can be set according to the operating voltage required by the electrical load, and this application does not impose specific limitations on this.

[0048] The first power source and the second power source satisfy at least one of the following conditions:

[0049] i) When the second power supply is supplying power to the power chip or when the power chip is powered off, the first power supply is in sleep mode;

[0050] ii) The first power supply is awakened in response to a failure of the second power supply and supplies power to the power chip.

[0051] In this embodiment, the output voltage of the first power supply is lower than that of the second power supply. This allows the second power supply to win the competition for power supply with the first power supply when both the first and second power supplies are powered by the power chip, and thus supply power to the power chip. Simultaneously, while the second power supply is supplying power to the power chip, the first power supply is in sleep mode. In sleep mode, its power consumption can be less than 5mW, extending the lifespan of the second power supply and reducing power consumption. When the second power supply fails, the first power supply is awakened and enters the working state to supply power to the power chip, enhancing the reliability of the power supply.

[0052] In some specific implementations of this application, the second power supply can be the main power supply for the power supply device to supply power to the outside, and the first power supply can be the auxiliary power supply for the power supply device to supply power to the outside. The first power supply only starts to work and supply power to the power chip when the second power supply is abnormal.

[0053] The first power supply can adjust its operating frequency, such as lowering the operating frequency to reduce its power consumption and enter a sleep state, or increasing the operating frequency to wake it up from the sleep state and put it into working state.

[0054] For example, the first power supply includes a flyback controller, and by adjusting the frequency of the flyback controller, the first power supply is controlled to be in a sleep state or an operating state. In some specific implementations of this application, when the switching frequency of the flyback controller is ≤50Hz, the first power supply is in a sleep state; when the switching frequency of the flyback controller is >50Hz, the first power supply is in an operating state. For example, the first power supply may include a flyback control chip UCC28730, which has a maximum switching frequency of 83kHz and a minimum switching frequency of 30Hz.

[0055] The frequency of the flyback controller can be used to regulate the output current of the first power supply. A higher frequency corresponds to a higher output current, and a lower frequency corresponds to a lower output current. Furthermore, the frequency of the flyback controller is also related to the output voltage of the first power supply; adjusting the frequency can stabilize the output voltage of the first power supply.

[0056] For example, the first power supply may also include a monitoring circuit for detecting the output voltage of the first power supply. When the voltage drop of the output voltage of the first power supply is detected to be lower than a preset threshold, for example, when the voltage drop of the output voltage of the first power supply is detected to be lower than 3%, a wake-up signal is sent to the flyback controller. The flyback controller responds to the wake-up signal and adjusts the switching frequency to put the flyback controller into a working state.

[0057] The monitoring circuit may include a monitoring chip, such as a UCC24650 chip, which periodically monitors the output voltage of the first power supply. For example, when a 3% voltage drop is detected in the output voltage of the first power supply relative to the previous reading, a wake-up signal is sent to the flyback controller.

[0058] Understandably, when the second power supply is normally supplying power to the power chip, the first power supply is in a dormant state. At this time, the output current of the first power supply is small and it does not have the ability to supply power to the load, that is, it does not have the ability to carry a load. When the second power supply fails or malfunctions, the first power supply supplies power to the load. Since the first power supply does not have the ability to carry a load at this time, when the load switches to be powered by the first power supply, it will pull down the output voltage of the first power supply. Therefore, by monitoring the voltage drop of the output voltage of the first power supply, the abnormal situation of the second power supply can be detected, thereby waking up the first power supply to supply power to the load.

[0059] Some optional embodiments of this application are illustrated in the schematic diagram of the first power supply as follows: Figure 2 As shown, it includes a flyback controller and a monitoring circuit.

[0060] Monitoring chip U2 monitors the voltage on the secondary side of the transformer. When the voltage drop on the secondary side falls below 3%, it sends a wake-up signal via the "WAKE" pin. Flyback control chip U1 detects this wake-up signal via its VS pin and increases the off-frequency of switch Q1 to wake up the first power supply. When both the first and second power supplies simultaneously power the power chip, the second power supply wins the competition for power supply because its output voltage (e.g., 11.5V) is lower than the second power supply's output voltage (e.g., 13.5V). At this time, flyback control chip U1 detects the current change on the primary side of the transformer via its CS pin. If the current decreases, it decreases the off-frequency of switch Q1 to put the first power supply into a sleep state. When the first power supply has no load, the current on its transformer primary side decreases. The HV pin of flyback control chip U1 is configured to be electrically connected to a battery, which provides the operating voltage for the flyback control chip.

[0061] Understandable, Figure 2 The schematic diagram shown is only for when the flyback controller uses the UCC28730 and the monitoring circuit uses the UCC24650 chip. When other chips are used for the flyback controller and / or monitoring circuit, the corresponding circuit diagram will be different. Therefore, it cannot be directly applied to the UCC28730. Figure 2 The schematic diagram shown is intended to define the first power supply. In some embodiments of this application, the first power supply may further include a filter capacitor C2.

[0062] In some embodiments of this application, the second power supply may include a DC / DC converter and a first transformer. The DC / DC converter is electrically connected to the primary side of the first transformer, and the secondary side of the first transformer is configured to be electrically connected to a power supply chip. The DC / DC converter is also configured to be electrically connected to an external battery module. To stabilize the output voltage of the second power supply, the second power supply may also include a filter capacitor C3, the schematic of which is shown below. Figure 3 As shown. Figure 3 The "Battery-side DC Input" is used for electrical connection to an external battery module. Figure 3 The “13.5V” in the figure refers to the output voltage of the second power supply.

[0063] In other embodiments of this application, the second power source may include a DC / DC converter, a first transformer, and a first switch. A first terminal of the first switch is configured to be electrically connected to the positive terminal of the battery module, a second terminal of the first switch is electrically connected to the DC / DC converter, and a control terminal of the first switch is configured to receive a drive signal. This drive signal is used to instruct the first switch to perform on or off operations. The schematic diagram is shown below. Figure 4 As shown. Figure 4 In this context, "K1" represents the first switch. Adding a first switch facilitates enhanced management of the second power source by controlling its on / off state, thereby improving its safety. In one specific implementation of this application, the second power source is electrically connected to the battery module, which provides power to the second power source. When the battery management system detects a low battery level, its microcontroller sends a shutdown signal to the control terminal of the first switch. The first switch then shuts off, disconnecting the battery module from the second power source and preventing over-discharge of the battery module.

[0064] The first switch can be a controlled switch that can receive a drive signal to turn on or off, such as various relays, transistor switches, IGBTs (Insulated Gate Bipolar Transistors), etc.

[0065] In some other embodiments of this application, the second power supply may include an AC / DC converter and a second transformer. The AC / DC converter is electrically connected to the primary side of the second transformer, and the secondary side of the second transformer is configured to be electrically connected to a power supply chip. The AC / DC converter is also configured to be electrically connected to an external AC power supply, and its schematic diagram is similar to... Figure 5 As shown.

[0066] This application also provides a battery management device, such as... Figure 6As shown, the battery management device includes a Battery Management System (BMS) and the aforementioned power supply device. The BMS may include a power chip, a second switch, a microcontroller, and a latch. The power supply terminal and the enable terminal of the power chip are electrically connected via the second switch. The power supply terminal is also electrically connected to the output terminals of a first power supply and a second power supply, respectively. The voltage output terminal of the power chip is electrically connected to the microcontroller, and the microcontroller is electrically connected to the enable terminal of the power chip via a latch. In one specific implementation of this application, the battery management system is presented as a first circuit board, on which the power chip, the second switch, the microcontroller, and the latch are arranged. The first and second power supplies are presented as a second circuit board. The first and second circuit boards are independent devices and can be electrically connected via wiring harnesses or connectors. In another specific implementation of this application, the battery management system and the power supply device can also be integrated on the same circuit board.

[0067] In some embodiments of this application, the second switch may be a tactile switch (push-button switch), which is turned on or off by applying pressure to the button. For example, by pressing the second switch, an effective level is input to the enable terminal of the power chip, enabling the power chip to power on, operate, and supply power to the microcontroller. The effective level is used to indicate that the power chip maintains its operating state.

[0068] The microcontroller can maintain the power supply chip's power-on or power-off state by controlling a latch. By pressing the second switch, a valid level is input to the power supply chip's enable pin, enabling the chip to operate and supply power to the microcontroller. Once powered on, the microcontroller controls the latch to hold the signal at the power supply chip's enable pin at a valid level, thus maintaining the power supply chip's operational state. When the microcontroller controls the latch to hold the signal at the power supply chip's enable pin at an invalid level, it can control the power supply chip to power off; the invalid level indicates that the power supply chip has been powered off.

[0069] The aforementioned effective and ineffective power levels are both voltage level signals. In some embodiments, the effective power level can be a high-level signal to indicate that the power chip is maintaining its operating state. The ineffective power level can be a low-level signal to indicate that the power chip is powered down.

[0070] A latch can be a device with signal latching function, such as an SR (Set Reset) latch or a D (Data) latch.

[0071] In some optional embodiments of this application, the battery management device further includes a first voltage divider branch and / or a second voltage divider branch. By adding the first voltage divider branch and / or the second voltage divider branch, the output voltage of the first power supply and / or the second power supply can be quickly obtained, thereby determining the state of the first power supply and / or the second power supply.

[0072] The first voltage divider branch includes at least two resistors connected in series. These at least two series-connected resistors are connected between the output terminal of the first power supply and ground. The first node between these at least two series-connected resistors is electrically connected to a microcontroller. The microcontroller can acquire the voltage of the first node to determine the state of the first power supply. It is understood that when the first power supply is in a low-power state or in an active state (powering the power chip), the voltage value of the first node is relatively stable. When the first power supply is woken up from a low-power state and enters the active state, the voltage value of the first node suddenly changes and is acquired by the microcontroller.

[0073] The second voltage divider branch includes at least two resistors connected in series. These at least two series-connected resistors are connected between the output terminal of the second power supply and ground. The second node between these at least two series-connected resistors is electrically connected to the microcontroller. The microcontroller can acquire the voltage of the second node to determine the state of the second power supply. Understandably, when the second power supply is in operation (powering the power chip), the voltage value of the second node is relatively stable. When a fault or abnormality occurs during the operation of the second power supply, the voltage value of the second node suddenly changes and is detected by the microcontroller.

[0074] In some optional embodiments of this application, the battery management device further includes: a first unidirectional conduction device and / or a second unidirectional conduction device. By adding a first unidirectional conduction device between the first power source and the power terminal of the power chip, and / or adding a second unidirectional conduction device between the second power source and the power terminal of the power chip, the first power source and the second power source are isolated from each other to avoid mutual interference.

[0075] The output terminal of the first power supply is electrically connected to the first terminal of the first unidirectional conducting device, and the second terminal of the first unidirectional conducting device is electrically connected to the power supply terminal of the power chip. The first unidirectional conducting device can be a device or component with unidirectional conductivity, for example, a diode. Specifically, the anode of the diode is electrically connected to the output terminal of the first power supply, and the cathode of the diode is electrically connected to the power supply terminal of the power chip.

[0076] The output terminal of the second power supply is electrically connected to the first terminal of the second unidirectional conducting device, and the second terminal of the second unidirectional conducting device is electrically connected to the power supply terminal of the power chip. The second unidirectional conducting device can be a device or component with unidirectional conductivity, for example, a diode. Specifically, the anode of the diode is electrically connected to the output terminal of the second power supply, and the cathode of the diode is electrically connected to the power supply terminal of the power chip.

[0077] In one optional embodiment, the battery management device further includes a third unidirectional conduction device. By adding a third unidirectional conduction device between the output terminal of the second power supply and the enable terminal of the power chip, the signal from the enable terminal of the power chip is prevented from flowing back into the second power supply.

[0078] The first terminal of the third unidirectional conducting device is connected to the output terminal of the second power supply, and the second terminal of the third unidirectional conducting device is electrically connected to the enable terminal of the power supply chip. The third unidirectional conducting device can be a device or component with unidirectional conduction, for example, it can be a diode. Specifically, the anode of the diode is electrically connected to the output terminal of the second power supply, and the cathode of the diode is electrically connected to the enable terminal of the power supply chip.

[0079] In one alternative embodiment, the battery management device further includes a fourth unidirectional conduction device. By adding a fourth unidirectional conduction device between the latch and the enable terminal of the power chip, the signal from the enable terminal of the power chip is prevented from flowing back into the latch.

[0080] The first terminal of the fourth unidirectional conducting device is electrically connected to the latch, and the second terminal of the fourth unidirectional conducting device is electrically connected to the enable terminal of the power supply chip. The fourth unidirectional conducting device can be a device or component with unidirectional conduction, for example, it can be a diode. Specifically, the anode of the diode is electrically connected to the output terminal of the latch, and the cathode of the diode is electrically connected to the enable terminal of the power supply chip.

[0081] In one alternative implementation, when the second power source included in the battery management device is as described above... Figure 4 When the second power source is shown, i.e., when the second power source includes a DC / DC converter, a first transformer, and a first switch, the battery management device further includes an isolation drive module. By adding the isolation drive module, it receives control signals sent by the microcontroller and outputs drive signals to the first switch to turn it on or off. The isolation drive module is electrically connected to the control terminals of both the microcontroller and the first switch. In this embodiment, the microcontroller sends control signals to the isolation drive module, and the isolation drive module, upon receiving the control signals, outputs drive signals to the control terminals of the first switch to turn it on or off.

[0082] The isolation driver module may include isolation driver devices, such as optocouplers. Specifically, the light-emitting diode inside the optocoupler is electrically connected to the microcontroller, and the phototransistor inside the optocoupler is electrically connected to the control terminal of the first switch.

[0083] For example, a schematic diagram of a battery management device can be shown as follows: Figure 7 As shown, it is understandable that Figure 7The battery management device shown is only one of the many embodiments of this application, and therefore should not be construed as a limitation on the embodiments of this application. Figure 7 R5 and R6 form the first voltage divider circuit, R7 and R8 form the second voltage divider circuit, K2 is the second switch, D3 is the first unidirectional conduction device, D4 ​​is the second unidirectional conduction device, D5 is the third unidirectional conduction device, and D6 is the fourth unidirectional conduction device.

[0084] To better understand how battery management devices work, the following explanations will cover different scenarios.

[0085] The first type, where the second power source includes a DC / DC converter, a first transformer, and a first switch, corresponds to the following working principle of the battery management device:

[0086] During the BMS system startup phase, pressing the second switch enables the power chip's enable pin, allowing the power chip to operate normally and supply power to the microcontroller. The microcontroller controls the first switch to turn on via the isolation driver module. Since the output voltage of the second power supply is greater than that of the first power supply, the power chip is powered by the second power supply, and the first power supply is in a sleep state. After the first switch is turned on, on the one hand, the enable pin of the power chip is maintained at an effective level through D5, and on the other hand, the enable pin of the power chip is latched to an effective level through a latch.

[0087] When the second power supply fails, the first power supply quickly enters the wake-up state from the sleep state to supply power to the power chip. When the BMS system powers down, the control latch needs to latch the enable pin of the power chip to an invalid level. When the power chip powers down, the first power supply automatically enters sleep mode.

[0088] The second type, where the second power source includes an AC / DC converter and a second transformer, and the corresponding battery management device operates on the following principle:

[0089] (i) If mains power is unavailable, during the BMS system startup phase, pressing the second switch enables the power chip's enable pin, allowing the power chip to operate normally and supply power to the microcontroller. After the microcontroller powers on, the control latch latches the enable pin of the main power chip to an active level, at which point the first power supply provides power. When the power chip powers off, the microcontroller controls the latch to latch the enable pin of the power chip to an inactive level, the power chip powers off, and the first power supply automatically enters sleep mode.

[0090] (ii) If mains power is available, the power chip is enabled via both D5 and the latch. The power chip operates normally, supplying power to the microcontroller. Since the output voltage of the second power supply is greater than that of the first power supply, the power chip is powered by the second power supply, and the first power supply automatically enters sleep mode. When the second power supply fails, the first power supply automatically and quickly enters wake-up mode to power the power chip. When the power chip is powered down, the latch needs to be controlled to latch the enable pin of the power chip to an invalid level. Upon power-down, the first power supply automatically enters sleep mode.

[0091] The power supply device in the battery management device embodiment has the same implementation principle and the same technical effect as the aforementioned power supply device embodiment. For the sake of brevity, any parts not mentioned in the battery management device embodiment can be referred to the corresponding content in the aforementioned power supply device embodiment.

[0092] This application also provides a battery system, including a battery module and the aforementioned battery management device. The battery module is electrically connected to the battery management device, which controls the charging and / or discharging of the battery module.

[0093] In some embodiments of this application, the battery module may include multiple individual battery cells, which can be connected in series, parallel, or series-parallel to form the battery module. In other embodiments of this application, the battery module may include multiple battery modules, each battery module including multiple individual battery cells, which can be connected in series, parallel, or series-parallel to form the battery module, and the multiple battery modules can be connected in series, parallel, or series-parallel to form the battery module. The individual battery cell may be a rechargeable battery, such as a lithium-ion battery, sodium-ion battery, magnesium-ion battery, etc., and may also be a solid-state battery, but is not limited thereto.

[0094] During use, batteries need to be charged and discharged, and the operation of the battery can be controlled by the battery management system.

[0095] The battery management device in the battery system embodiment has the same implementation principle and the same technical effect as the aforementioned battery management device embodiment. For the sake of brevity, any parts not mentioned in the battery system embodiment can be referred to the corresponding content in the aforementioned battery management device embodiment.

[0096] This application also provides an electrical device, which includes a load and the aforementioned battery system, wherein the battery system supplies power to the load. Different electrical devices correspond to different loads.

[0097] The electrical equipment can be a battery energy storage system, or it can be an electric train, electric car, ship, electric two-wheeler (such as electric car, electric bicycle, etc.), electric motorcycle, electric tricycle, etc.

[0098] The principle and technical effects of the battery system provided in the electrical equipment embodiment are the same as those in the aforementioned battery system embodiment. For the sake of brevity, any parts not mentioned in the electrical equipment embodiment can be referred to the corresponding content in the aforementioned battery system embodiment.

[0099] This application also provides a method for powering a battery management device, which can be applied to the aforementioned battery system. The following will be combined with... Figure 8 The present application describes a power supply method for a battery management device provided in an embodiment. This power supply method may include steps S1 and S2.

[0100] S1: In response to the second switch being pressed, the power chip operates and supplies power to the microcontroller.

[0101] By pressing the second switch, an effective level is input to the enable pin of the power chip, which then powers on and supplies power to the microcontroller.

[0102] Step S2: i) In response to the battery system receiving an external AC power source, the external AC power source supplies power to the power chip through the AC / DC converter and the second transformer of the second power source, and the power chip operates and supplies power to the microcontroller; or, ii) the battery module supplies power to the power chip through the DC / DC converter, the first transformer and the first switch of the second power source, and the power chip operates and supplies power to the microcontroller.

[0103] When the power chip is powered on, the battery management device responds to the battery system receiving external AC power. This external AC power supplies the power chip through the AC / DC converter and second transformer of the second power supply, enabling the power chip to operate and power the microcontroller. Alternatively, the battery module supplies the power chip through the DC / DC converter, first transformer, and first switch of the second power supply, enabling the power chip to operate and power the microcontroller. Because the output voltage of the first power supply is lower than the output voltage of the second power supply, when both the first and second power supplies are normally supplying power to the power chip, the second power supply can win the competition for power supply with the first power supply and supply power to the power chip.

[0104] In some embodiments, the power supply method for the battery management device further includes step S3: the microcontroller operates and controls the latch to latch the signal at the enable terminal of the power chip to an effective level, the effective level being used to indicate that the power chip maintains its operating state.

[0105] In some embodiments, the battery management device power supply method further includes steps S4 and S5. Step S4: The first power supply is in a sleep state; Step S5: In response to an abnormality in the second power supply, the first power supply is woken up and enters a working state, and the first power supply supplies power to the power chip.

[0106] In some embodiments, the battery management device power supply method further includes step S6: in response to the battery system being powered down, the microcontroller controls the latch to latch the signal at the enable terminal of the power chip to an invalid level, the invalid level being used to indicate that the power chip is powered down.

[0107] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0108] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0109] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery management device, comprising: Power supply equipment, including a first power supply and a second power supply; A power chip and a second switch, wherein the power supply terminal of the power chip and the enable terminal of the power chip are electrically connected through the second switch; The power supply terminal of the power chip is also electrically connected to the output terminal of the first power supply and the output terminal of the second power supply, respectively. The power chip's voltage output terminal is electrically connected to the microcontroller. and A latch, wherein the microcontroller is electrically connected to the enable terminal of the power chip via the latch; The microcontroller is configured to control the latch to latch the signal at the enable terminal of the power chip to an active level after power-on, so that the power chip maintains its operating state.

2. The battery management device according to claim 1, wherein, The output voltage of the first power supply is less than the output voltage of the second power supply, and the first power supply and the second power supply satisfy at least one of the following conditions: i) When the second power supply is supplying power to the power chip, the first power supply is in sleep mode; ii) The first power supply is awakened in response to a failure of the second power supply and supplies power to the power chip.

3. The battery management device according to claim 1 or 2, wherein, The first power supply includes a flyback controller; The second power supply includes a DC / DC converter and a first transformer. The DC / DC converter is electrically connected to the primary side of the first transformer, and the secondary side of the first transformer is configured to be electrically connected to the power supply chip. or, The second power supply includes an AC / DC converter and a second transformer. The AC / DC converter is electrically connected to the primary side of the second transformer, and the secondary side of the second transformer is configured to be electrically connected to the power supply chip.

4. The battery management device according to claim 3, wherein the second power supply includes a DC / DC converter, a first transformer and a first switch, a first terminal of the first switch is configured to be electrically connected to the positive terminal of the battery module, a second terminal of the first switch is electrically connected to the DC / DC converter, and a control terminal of the first switch is configured to receive a drive signal; in, The drive signal is used to instruct the first switch to turn on or off.

5. The battery management device according to any one of claims 1 to 4, wherein the second switch is a tactile switch.

6. The battery management device according to any one of claims 1 to 5, further comprising: The first voltage divider branch includes at least two resistors connected in series, the at least two resistors connected in series are connected between the output terminal of the first power supply and ground, and the first node between the at least two resistors connected in series is electrically connected to the microcontroller. And / or, The second voltage divider branch includes at least two resistors connected in series. The at least two resistors connected in series are connected between the output terminal of the second power supply and ground. The second node between the at least two resistors connected in series is electrically connected to the microcontroller.

7. The battery management device according to any one of claims 1 to 6, further comprising: The first unidirectional conduction device, wherein the output terminal of the first power supply is electrically connected to the first terminal of the first unidirectional conduction device, and the second terminal of the first unidirectional conduction device is electrically connected to the power supply terminal of the power chip. And / or, The second unidirectional conduction device has its output terminal electrically connected to the first terminal of the second unidirectional conduction device, and its second terminal electrically connected to the power terminal of the power chip.

8. The battery management device according to any one of claims 1 to 7, wherein, The second power supply includes: a DC / DC converter, a first transformer, and a first switch, wherein a first terminal of the first switch is configured to be electrically connected to the positive terminal of the battery module, and a second terminal of the first switch is electrically connected to the DC / DC converter; The battery management device further includes: an isolation drive module; The isolation drive module is electrically connected to the control terminals of the microcontroller and the first switch, respectively. The isolation drive module is configured to receive a control signal and output a drive signal to the control terminal of the first switch to drive the first switch to perform on or off operations.

9. The battery management device according to any one of claims 1 to 8, further comprising: Third unidirectional conduction device; The first end of the third unidirectional conduction device is connected to the output end of the second power supply, and the second end of the third unidirectional conduction device is electrically connected to the enable end of the power chip.

10. The battery management device according to any one of claims 1 to 9, further comprising: Fourth unidirectional conduction device; The first end of the fourth unidirectional conduction device is electrically connected to the latch, and the second end of the fourth unidirectional conduction device is electrically connected to the enable terminal of the power chip.

11. A battery system, comprising: Battery module and battery management device as described in any one of claims 1 to 10; The battery module is electrically connected to the battery management device, which is used to control the charging and / or discharging of the battery module.

12. The battery system of claim 11, wherein the second power source comprises: AC / DC converter and second transformer; The AC / DC converter is configured to be electrically connected to an external AC power source.

13. The battery system of claim 11, wherein the second power source comprises: The DC / DC converter, the first transformer, and the first switch are provided, wherein the first terminal of the first switch is electrically connected to the positive terminal of the battery module, and the second terminal of the first switch is electrically connected to the DC / DC converter. The input terminal of the DC / DC converter is electrically connected to the positive terminal of the battery module via the first switch.

14. An electrical appliance, comprising: The load and the battery system as described in any one of claims 11 to 13; The battery system supplies power to the load.

15. A method for supplying power to a battery management device, applied to a battery system as described in any one of claims 11 to 13, comprising the following steps: Step S1: In response to the operation of pressing the second switch, the power chip operates and supplies power to the microcontroller; Step S2: i) In response to the battery system receiving an external AC power source, the external AC power source supplies power to the power chip via an AC / DC converter and a second transformer of the second power source, the power chip operates and supplies power to the microcontroller; or ii) The battery module supplies power to the power chip through the DC / DC converter of the second power source, the first transformer and the first switch, and the power chip operates and supplies power to the microcontroller.

16. The power supply method for the battery management device according to claim 15, further comprising: Step S3: The microcontroller operates and controls the latch to latch the signal at the enable terminal of the power chip to an effective level; The effective level is used to indicate that the power chip maintains its operating state.

17. The battery management device power supply method according to claim 15 or 16, further comprising: Step S4: The first power supply is in sleep mode; Step S5: In response to the second power supply failure, the first power supply is woken up and enters the working state, and the first power supply supplies power to the power chip.

18. The battery management device power supply method according to any one of claims 14 to 17, further comprising: Step S6: In response to the power-down of the battery system, the microcontroller controls the latch to latch the signal at the enable terminal of the power chip to an invalid level; The invalid level is used to indicate that the power chip is powered down.

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