Battery management device and energy storage system

Abstract

This application discloses a battery management device and an energy storage system. The energy storage system includes a battery module. The battery management device includes a battery management chip, a control switch, a power module, a power control module, and a controller. The control switch is connected between the positive terminal of the battery module and the battery management chip and is configured to close upon receiving a first drive signal, so that the battery module can supply power to the battery management chip. The power module is connected to both the battery module and the controller and is configured to supply power to the controller upon receiving a second drive signal. The power control module is connected to the control switch, the power module, and the positive terminal of the battery module. The power control module is configured to provide a first drive signal to the control switch and a second drive signal to the power module, and upon receiving a power-off control command, to stop providing the first and second drive signals to the control switch and the power module, respectively, so that the control switch is turned off and the power module is powered down.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery management device and an energy storage system. Background Technology

[0002] Portable energy storage systems are portable power devices that store electrical energy and power various devices when needed. They are commonly used in outdoor camping, earthquake relief, medical rescue, home backup power, and outdoor operations. Typically, when not in use, portable energy storage products are mostly idle in standby or off states. Because the battery management systems inside portable energy storage products contain electronic components, some consuming power in the tens of mA level (low-power mode) and others in the tens of µA level (traditional shutdown mode, which isn't actually completely shut down), both states continuously consume battery energy. If the product is left idle for an extended period without charging, the electronic components will deplete the battery's energy, causing severe battery depletion, rendering it unusable and ultimately unusable. Utility Model Content

[0003] This application provides a battery management device and an energy storage system. By independently controlling the power supply logic to the battery management chip and controller, it ensures that both are completely shut down upon receiving a shutdown control command, thus avoiding the problem of continuous power consumption by the energy storage system.

[0004] The battery management device according to the embodiments of this application is used in an energy storage system. The energy storage system includes a battery module, and the battery management device includes a battery management chip, a control switch, a power module, a power control module, and a controller.

[0005] The control switch is connected between the positive terminal of the battery module and the battery management chip, and is configured to close when a first drive signal is received, so that the battery module can supply power to the battery management chip.

[0006] The power module is connected to the battery module and the controller respectively, and is configured to supply power to the controller when a second drive signal is received.

[0007] The power control module is connected to the control switch, the power module, and the positive terminal of the battery module, respectively. The power control module is configured to provide a first drive signal to the control switch and a second drive signal to the power module, and, upon receiving a power-off control command, to stop providing the first drive signal and the second drive signal to the control switch and the power module, respectively, so that the control switch is turned off and the power module is powered off.

[0008] In some implementations, the controller is connected to the power control module and is configured to provide a shutdown control command to the power control module upon receiving a shutdown signal.

[0009] In some embodiments, the power control module is further configured to, upon receiving a power-on signal, provide the first drive signal to the control switch and the second drive signal to the power module so that the power module supplies power to the controller.

[0010] In some implementations, the control switch includes a PMOS transistor.

[0011] In some implementations, the gate of the PMOS transistor is connected to the positive terminal of the battery module through the power control module.

[0012] In some embodiments, the battery management device further includes:

[0013] A charge / discharge switch module is provided, through which the battery module is connected to a load or power source, and the battery management chip is also connected to the charge / discharge switch module and the controller.

[0014] The controller is also configured to provide a control signal to the battery management chip upon receiving a power-off signal, and the battery management chip is configured to control the charge / discharge switch module to turn off according to the control signal.

[0015] In some implementations, the battery management chip is also configured to acquire analog signals from the battery module.

[0016] In the energy storage system of this application, the control switch and power module are independently controlled by the first and second drive signals, respectively. This allows for precise regulation of the power supply logic from the battery module to the battery management chip and controller. The power control module can provide drive signals to ensure the normal operation of the energy storage system, and simultaneously cut off the drive to the control switch and power module upon receiving a shutdown control command, thus completely shutting them down. This solves the problem of continuous power consumption of the electronic components of the battery management device in the energy storage system, significantly reduces the power consumption of the energy storage system in idle states, effectively prevents the battery module from failing due to long-term underpowerment, and significantly improves the energy utilization efficiency and service life of the energy storage system. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the energy storage system according to certain embodiments of this application.

[0019] Explanation of icon numbers

[0020] Energy storage system 100, battery management device 10, battery management chip 11, control switch Q1, power module 12, power control module 13, controller 14, battery module 20. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] Portable energy storage systems are portable power devices that can store electrical energy and supply power to various devices when needed. They are often used in outdoor camping, earthquake relief, medical rescue, home backup power, and outdoor operations.

[0023] Typically, portable energy storage products are left idle in standby or off state when not in use. In related technologies, when a portable energy storage product is powered off, only the power to the Battery Management System (BMS) is turned off, thus achieving power-off. However, the circuit module of the Battery Management Component (AFE) chip inside the BMS remains connected to the battery, resulting in a continuous power loss of tens of µA. This continuously consumes the battery's energy. If the product is left idle for an extended period without charging, whether in standby or off state, the battery's energy will be completely depleted, causing severe battery depletion, rendering it unusable and ultimately rendering it unusable.

[0024] In view of this, please refer to Figure 1 This application provides an energy storage system 100, which includes a battery management device 10 and a battery module 20, wherein the battery management device 10 is electrically connected to the battery module 20.

[0025] The battery management device 10 includes a battery management chip 11, a control switch Q1, a power module 12, a power control module 13, and a controller 14. The control switch Q1 is connected between the positive terminal of the battery module 20 and the battery management chip 11, and is configured to close upon receiving a first drive signal, enabling the battery module 20 to supply power to the battery management chip 11. The power module 12 is connected to both the battery module 20 and the controller 14, and is configured to supply power to the controller 14 upon receiving a second drive signal.

[0026] The power control module 13 is connected to the control switch Q1, the power module 12 and the positive terminal of the battery module 20 respectively. The power control module 13 is configured to provide a first drive signal to the control switch Q1 and a second drive signal to the power module 12, and to stop providing the first drive signal and the second drive signal to the control switch Q1 and the power module 12 respectively when a power-off control command is received, so that the control switch Q1 is turned off and the power module 12 is powered off.

[0027] In the energy storage system 100 and battery management device 10 of this application embodiment, by setting the control switch Q1 and the power module 12 to be independently controlled by the first drive signal and the second drive signal output by the power control module 13, respectively, the power supply logic of the battery management device 10 to the battery management chip 11 and the controller 14 can be precisely controlled. This allows the power control module 13 to provide drive signals to ensure the normal operation of the energy storage system 100, and to simultaneously cut off the drive to the control switch Q1 and the power module 12 when receiving the shutdown control command, so that both are completely shut down and the battery management device 10 is completely powered off. This avoids the electronic components in the battery management device 10 from continuously consuming the power of the battery module 20. In this way, the problem of continuous power consumption of the electronic components in the battery management device 10 in the energy storage system 100 is solved, the power consumption of the energy storage system 100 in the idle state is greatly reduced, the battery module 20 is effectively prevented from being scrapped due to long-term power loss, and the energy utilization efficiency and service life of the energy storage system 100 are significantly improved.

[0028] Specifically, the energy storage system 100 can be a portable energy storage system 100. For example, in this embodiment, the energy storage system 100 can be a portable photovoltaic energy storage system. Understandably, the photovoltaic energy storage system 100 can convert light energy into electrical energy and store it, as well as supply electrical energy to the load. That is, the photovoltaic energy storage system 100 takes into account the functions of photoelectric conversion, electrical energy storage, and discharge.

[0029] The battery module 20 is used to store electrical energy. The battery module 20 can be, but is not limited to, lithium iron phosphate batteries, lithium manganese iron phosphate batteries, sodium batteries, etc. The battery management device 10 can be a battery management system (BMS). The battery management device 10 is the core management component of the energy storage system 100. The battery management device 10 can be electrically connected to the battery module 20 to manage the charging and discharging of the battery module 20, ensuring the safe, efficient, and long-life operation of the battery module 20. The battery management device 10 can also collect relevant parameters of the battery module 20, provide safety status estimation for the battery module 20, and implement communication and control functions. These relevant parameters may include, but are not limited to, voltage, current, ambient temperature, battery health status, and state of charge (SOC).

[0030] The battery management device 10 may include a battery management chip 11, a control switch Q1, a power module 12, a power control module 13, and a controller 14.

[0031] The battery management chip 11 can be an analog front end (AFE) that can connect to the battery module 20. It is used for the acquisition, preprocessing, and preliminary conversion of analog signals from the battery module 20, providing accurate battery status data to the controller 14 MCU. The analog signals can be current signals, voltage signals, etc.

[0032] Control switch Q1 is connected between the positive terminal of battery module 20 and battery management chip 11. It controls the electrical connection between battery module 20 and battery management chip 11. When control switch Q1 is closed, battery module 20 can directly supply power to battery management chip 11 through Q1, allowing battery management chip 11 to sample analog signals from battery module 20. When control switch Q1 is closed, battery module 20 disconnects from battery management chip 11, stopping power supply to battery management chip 11. Control switch Q1 can be, but is not limited to, a metal-oxide-semiconductor field-effect transistor (MOSFET), a mechanical relay, or a transistor (such as a bipolar junction transistor, BJT).

[0033] The power module 12 is used to provide a stable, safe, and compliant power supply to various circuits and chips inside the battery management device 10. One end of the power module 12 is connected to the positive terminal of the battery module 20, and the other end is connected to the controller 14. The power module 12 can convert the electricity from the battery module 20 into the voltage required by the controller 14 and supply it to the controller 14, thereby powering the entire battery management device 10.

[0034] The power control module 13 is electrically connected to the positive terminal of the battery module 20, the control switch Q1, and the power module 12. The battery module 20 supplies power to the power control module 13. When the energy storage system 100 is powered on, the power control module 13 provides a first drive signal to the control switch Q1, causing the control switch Q1 to close, and provides a second drive signal to the power module 12, thereby driving the power module 12 to supply power to the controller 14. When the energy storage system 100 needs to be powered off due to pressing the power off button or a malfunction, the power control module 13 receives a power off control command, thereby stopping the output of the first and second drive signals. The control switch Q1 turns off without the first drive signal, and the power module 12 is powered down without the second drive signal, stopping the supply of power to the controller 14. This disconnects the power supply to the entire battery management device 10, completing the power off process. As a result, the energy consumption of the battery management device 10 from the battery module 20 is less than 1uA. This significantly reduces the power consumption of the battery management device 10 in the idle state, effectively prevents the battery module 20 from being scrapped due to long-term power loss, and significantly improves the energy utilization efficiency and service life of the energy storage system 100.

[0035] The controller 14 can be an MCU, responsible for receiving and processing analog signals such as battery voltage, current, and temperature collected by modules such as the battery management chip 11. It estimates key states such as SOC, SOH, and SOP in real time through algorithms, and makes decisions such as charge and discharge control, equalization adjustment, and thermal management coordination based on these states. At the same time, it monitors the status of the battery module 20 to trigger safety protection actions such as overcharge, over-discharge, and over-temperature. It also realizes data interaction with other modules and external systems through internal and external communication interfaces, ultimately achieving intelligent management, safety protection, and performance optimization of the battery module 20.

[0036] In some implementations, the controller 14 is connected to the power control module 13 and is configured to provide a shutdown control command to the power control module 13 upon receiving a shutdown signal.

[0037] It should be noted that the shutdown signal can be generated when the user presses the shutdown button or when the energy storage system 100 malfunctions. For example, in some examples, the battery management device 10 is also equipped with a shutdown button, and the controller 14 is electrically connected to the shutdown button. When the user clicks the shutdown button, the controller 14 can receive the shutdown signal and output a shutdown control command to the power control module 13.

[0038] Thus, by electrically connecting the controller 14 and the power control module 13, when the controller 14 receives a shutdown signal, it can promptly send a shutdown control command to the power control module 13, thereby making the shutdown operation more precise and efficient. It can quickly trigger the power control module 13 to cut off the relevant drive signals, thereby achieving reliable shutdown of the energy storage system 100 and further reducing energy consumption.

[0039] In some embodiments, the power control module 13 is also configured to provide a first drive signal to the control switch Q1 and a second drive signal to the power module 12 upon receiving a power-on signal, so that the power module 12 supplies power to the controller 14.

[0040] Specifically, the power-on signal can be generated by the user pressing the power button or by the energy storage system 100 receiving a charging signal. When the energy storage system 100 is in the off state, pressing the power-on or power-off button or receiving a charging signal will input the power-on signal to the power control module 13. After receiving the power-on signal, the power control module 13 will output a first drive signal to the control switch Q1, turning on the control switch Q1 and activating the battery management chip 11. At the same time, the power control module 13 will also output a second drive signal to wake up the power module 12. The power module 12 will output power to the controller 14, activating the controller 14. After the controller 14 is activated, it can output a power control signal to the power control module 13, enabling the power control module 13 to continuously provide the second drive signal to the power module 12, thus maintaining the operation of the power module 12 and allowing the battery management device 10 to complete the power-on initialization. If there is no fault, the entire energy storage system 100 will be powered on.

[0041] Thus, upon receiving a power-on signal, the power control module 13 can promptly provide a first drive signal to the control switch Q1 and a second drive signal to the power module 12, thereby quickly triggering the control switch Q1 to conduct and connect the power supply circuit between the battery module 20 and the battery management chip 11. Simultaneously, it drives the power module 12 to supply power to the controller 14. This achieves efficient linkage between the power-on command and the power supply path startup, ensuring that the energy storage system 100 can quickly switch from the shutdown state to the operating state, improving the power-on response speed, and guaranteeing the stability and reliability of the energy storage system 100 during the startup process.

[0042] In some implementations, the control switch Q1 includes a PMOS transistor. The first drive signal can be a low-level signal.

[0043] Understandably, the PMOS transistor is connected as a high-side control switch Q1 between the positive terminal of the battery module 20 and the battery management chip 11. By pulling the gate voltage of the PMOS transistor low (relative to the positive terminal of the battery), the PMOS can be easily turned on. Its low on-resistance (Rds(on)) provides the battery management chip 12 with a power supply close to the battery voltage and with virtually no loss. When the gate voltage is pulled high, it is reliably turned off, completely isolating the battery management chip 11 from the positive terminal of the battery module 20, achieving a near-zero power consumption shutdown state. It also relies on its internal body diode to prevent reverse current, making it suitable for battery-powered devices with a simple drive circuit. Furthermore, it reduces standby power consumption and improves the energy efficiency and stability of the energy storage system 100.

[0044] In some embodiments, the gate of the PMOS transistor is connected to the positive terminal of the battery module 20 via the power control module 13. When the energy storage system 100 is in the power-on state, the positive terminal of the battery module 20 is connected to the gate of the PMOS transistor via the power control module 13, thereby providing a high-level signal to the gate of the PMOS transistor, causing the PMOS transistor to conduct; when the energy storage system 100 is in the power-off state, the positive terminal of the battery module 20 is disconnected from the gate of the PMOS transistor, thereby causing the PMOS transistor to turn off.

[0045] Thus, by connecting the gate of the PMOS transistor to the positive terminal of the battery module 20 through the power control module 13, precise control of the PMOS transistor is achieved using the positive voltage of the battery module 20. When the power control module 13 outputs a drive signal, the voltage difference between the gate and source can be adjusted to quickly turn on the PMOS transistor, ensuring a smooth power supply path. When it is necessary to turn off, the power control module 13 stops outputting the drive signal, and the connection between the gate and the positive terminal of the battery module 20 causes the gate voltage to approach the source voltage, satisfying the PMOS transistor's turn-off condition (VGS≥0), thereby quickly cutting off the path. This simplifies the control logic, improves the stability and response speed of the PMOS transistor's on / off control, and further optimizes the system's power consumption control.

[0046] In some embodiments, the battery management device 10 further includes a charge / discharge switch module (not shown in the figure), the battery module 20 is connected to a load or power source through the charge / discharge switch module, and the battery management chip 11 is also connected to the charge / discharge switch module and the controller 14; the controller 14 is also configured to provide a control signal to the battery management chip 11 when a power-off signal is received, and the battery management chip 11 is configured to control the charge / discharge switch module to turn off according to the control signal.

[0047] Thus, when the controller 14 receives a shutdown signal, it sends a control signal to the battery management chip 11. The battery management chip 11 then controls the charging / discharging switch module to shut down based on this signal, thereby cutting off the connection between the battery module 20 and the load or power source. This completely disconnects the charging / discharging circuit of the battery module 20 during the shutdown process of the energy storage system 100, preventing abnormal charging / discharging situations that may occur after shutdown, reducing unnecessary energy loss, and providing more comprehensive protection for the battery module 20, further improving the safety and reliability of the energy storage system 100 in the shutdown state.

[0048] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery management device for an energy storage system, comprising: The energy storage system includes a battery module, and the battery management device includes a battery management chip, a control switch, a power module, a power control module, and a controller. The control switch is connected between the positive terminal of the battery module and the battery management chip, and is configured to close when a first drive signal is received, so that the battery module can supply power to the battery management chip. The power module is connected to the battery module and the controller respectively, and is configured to supply power to the controller when a second drive signal is received. The power control module is connected to the control switch, the power module, and the positive terminal of the battery module, respectively. The power control module is configured to provide a first drive signal to the control switch and a second drive signal to the power module, and, upon receiving a power-off control command, to stop providing the first drive signal and the second drive signal to the control switch and the power module, respectively, so that the control switch is turned off and the power module is powered off.

2. The battery management device of claim 1, wherein, The controller is connected to the power control module and is configured to provide a shutdown control command to the power control module when a shutdown signal is received.

3. The battery management device of claim 1, wherein, The power control module is also configured to, upon receiving a power-on signal, provide the first drive signal to the control switch and the second drive signal to the power module so that the power module supplies power to the controller.

4. The battery management device of claim 1, wherein, The control switch includes a PMOS transistor.

5. The battery management device of claim 4, wherein, The gate of the PMOS transistor is connected to the positive terminal of the battery module through the power control module.

6. The battery management device according to claim 5, characterized in that, The battery management device further includes: A charge / discharge switch module is provided, through which the battery module is connected to a load or power source, and the battery management chip is also connected to the charge / discharge switch module and the controller. The controller is also configured to provide a control signal to the battery management chip upon receiving a power-off signal, and the battery management chip is configured to control the charge / discharge switch module to turn off according to the control signal.

7. The battery management apparatus according to claim 1, characterized by, The battery management chip is also configured to acquire analog signals from the battery module.

8. An energy storage system characterized by, Includes the battery management device and battery module as described in any one of claims 1-7.

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