Circuit, control method and storage medium for automatically waking up battery system

Abstract

This application discloses a circuit, control method, and storage medium for automatically waking up a battery system. The circuit includes a main circuit: the positive electrode of the battery is connected in series with a charging MOSFET and a discharging MOSFET, and ultimately connected to the positive electrode of an energy storage inverter, while the negative electrode of the battery is connected to the negative electrode of the energy storage inverter; a low-power wake-up circuit: one end is connected to the positive electrode of the battery, and is connected in series with a first diode, a second diode, and a normally closed relay, and ultimately connected to the positive electrode of the energy storage inverter; a battery management system (BMS): the first end of the BMS is connected to the battery cell voltage acquisition sensor, the second end of the BMS is connected to the battery cell temperature acquisition sensor, the third end of the BMS is connected to the normally closed relay, the fourth end of the BMS is connected between the first and second diodes, and the fifth end of the BMS is connected to the negative electrode of the battery. This application can achieve low-power automatic wake-up and safe activation of the battery system.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a circuit, a control method, and a storage medium for automatically waking up a battery system. Background Art

[0002] After a battery system is deeply discharged, to reduce power consumption and protect the battery from permanent damage, the battery management system (BMS) usually controls the battery to enter a dormant state. After dormancy, existing methods for waking up the battery generally require sufficient power inside the battery to power the battery management system (BMS). The battery system is then awakened through external communication, voltage activation, or restarting the battery. Once the battery does not have sufficient power to power the battery management system (BMS), the above activation methods will become ineffective. At this point, the only way is to manually charge the battery system directly, bypassing the charge and discharge control switch, and then wake up the battery system after the power is sufficient for the BMS to operate normally. These methods greatly increase manual maintenance costs and add additional risks of manual charging. Summary of the Invention

[0003] In response to the above problems, the purpose of this application is to provide a circuit, control method and storage medium for automatically waking up the battery system, which can achieve low-power wake-up and safe activation of the battery system through a low-power wake-up loop and BMS logic.

[0004] According to one aspect of the present application, a circuit for automatically waking up a battery system is provided, the circuit comprising:

[0005] Main circuit: The positive pole of the battery is connected in series with the charging MOSFET and the discharging MOSFET and finally connected to the positive pole of the energy storage inverter, and the negative pole of the battery is connected to the negative pole of the energy storage inverter;

[0006] Low-power wake-up circuit: One end is connected to the positive pole of the battery, and is connected in series with the first diode, the second diode, and the normally closed relay, and finally connected to the positive pole of the energy storage inverter;

[0007] Battery Management System (BMS): Its first end is connected to the battery cell voltage acquisition sensor, its second end is connected to the battery cell temperature acquisition sensor, its third end is connected to the normally closed relay, its fourth end is connected between the first diode and the second diode, and its fifth end is connected to the negative electrode of the battery;

[0008] The energy storage inverter is set to:

[0009] Self-start and command battery discharge;

[0010] When the energy storage inverter issues a discharge command but detects no voltage output from the battery, the energy storage inverter outputs an initial voltage through the normally closed relay and the second diode to wake up the battery management system BMS;

[0011] The battery management system BMS is set to:

[0012] After detecting the initial voltage, the energy storage inverter is controlled to prohibit the battery from discharging and force the energy storage inverter to charge the battery through the main circuit. The charging current is not greater than the current limit value.

[0013] When it is detected that the battery power reaches the power supply threshold of the battery management system BMS, the normally closed relay is controlled to disconnect, cutting off the power supply channel from the energy storage inverter to the battery management system BMS. The battery supplies power to the battery management system BMS and the battery system is automatically activated.

[0014] Preferably, in some embodiments of the present application, the drain of the charging MOSFET is connected to the drain of the discharging MOSFET.

[0015] Preferably, in some embodiments of the present application, the anode of the first diode is connected to the anode of the second diode.

[0016] Preferably, in some embodiments of the present application, the current limiting value is 1A.

[0017] Preferably, in some embodiments of the present application, the current limit value is dynamically corrected in real time based on the battery cell temperature and / or the remaining battery capacity, and the correction formula is as follows:

[0018] ;

[0019] Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

[0020] According to another aspect of the present application, the present application further provides a circuit control method for automatically waking up a battery system, including the circuit of any one of the above embodiments, the control method comprising:

[0021] The energy storage inverter starts automatically and instructs the battery to discharge;

[0022] When the energy storage inverter issues a discharge command but detects no voltage output from the battery, the energy storage inverter outputs an initial voltage through the normally closed relay and the second diode to wake up the battery management system BMS;

[0023] After the battery management system (BMS) detects the initial voltage, it controls the energy storage inverter to prohibit the battery from discharging and forces the energy storage inverter to charge the battery through the main circuit. The charging current is not greater than the current limit value.

[0024] When the battery management system BMS detects that the battery power reaches the power supply threshold of the battery management system BMS, it controls the normally closed relay to disconnect, cuts off the power supply channel from the energy storage inverter to the battery management system BMS, and the battery supplies power to the battery management system BMS, and the battery system is automatically activated.

[0025] Preferably, in some embodiments of the present application, the current limit value is dynamically corrected in real time based on the battery cell temperature and / or the remaining battery capacity, and the correction formula is as follows:

[0026] ;

[0027] Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

[0028] According to another aspect of the present application, the present application further provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, the control method of any one of the above embodiments can be implemented.

[0029] It should be understood that within the scope of this application, the above-mentioned technical features of this application and the technical features described in detail below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be listed here one by one.

[0030] Compared with the existing technology, this application has the following technical effects:

[0031] This application can automatically activate a deep-dormant battery system. When the battery system is connected to an external charging and discharging device, it can automatically and intelligently wake up the battery system, avoiding manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0033] Figure 1 A schematic diagram of a circuit for automatically waking up a battery system according to an embodiment of the present application is shown.

[0034] Figure numerals: 1 Battery cell voltage acquisition sensor; 2 Battery cell temperature acquisition sensor; 3 First diode; 4 Second diode; 5 Charging MOSFET; 6 Normally closed relay; 7 Energy storage inverter; 8 Discharging MOSFET; 9 Battery management system BMS; 10 Battery. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, beneficial effects, and significant improvements of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, all the embodiments described are only some of the embodiments of this application, not all of them; based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] The present application will be further described below in conjunction with specific implementations. It should be understood that these embodiments are only used to illustrate the present application and are not intended to limit the scope of the present application.

[0037] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment herein. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor does it limit mutually exclusive independent or alternative embodiments. Those skilled in the art will appreciate that an embodiment herein may be combined with other embodiments as long as no structural conflicts arise.

[0038] In the description herein, unless otherwise specified or limited, the technical terms "installed," "connected," and "connected" should be understood broadly, and may refer to a movable connection, a fixed connection or integration, or connection via a connector. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on the specific circumstances.

[0039] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "horizontal", "vertical", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to having a specific orientation, being installed or operated in a specific orientation, and should not be understood as limiting the embodiments in this document.

[0040] In the description herein, terms such as "first" and "second" are used only to distinguish different objects and should not be understood to indicate relative importance or to limit the quantity, specific order, or primary and secondary relationship of the described technical features. In the description herein, "plurality" means at least two.

[0041] Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts.

[0042] Figure 1 FIG. 1 is a schematic diagram showing a circuit for automatically waking up a battery system according to an embodiment of the present application. Figure 1 As shown, a circuit for automatically waking up a battery system of the present application includes:

[0043] Main circuit: The positive electrode of the battery 10 is connected in series with the charging MOSFET 5 and the discharging MOSFET 8, and finally connected to the positive electrode of the energy storage inverter 7. The negative electrode of the battery 10 is connected to the negative electrode of the energy storage inverter 7.

[0044] Low-power wake-up circuit: one end is connected to the positive electrode of the battery 10, and is connected in series with the first diode 3, the second diode 4, the normally closed relay 6, and finally connected to the positive electrode of the energy storage inverter 7;

[0045] Battery management system BMS9: Its first end is connected to the cell voltage acquisition sensor 1 of the battery 10, its second end is connected to the cell temperature acquisition sensor 2 of the battery 10, its third end is connected to the normally closed relay 6, its fourth end is connected between the first diode 3 and the second diode 4, and its fifth end is connected to the negative electrode of the battery 10;

[0046] The energy storage inverter 7 is set as follows:

[0047] Self-starting and instructing battery 10 to discharge;

[0048] When the energy storage inverter 7 issues a discharge command but does not detect that the battery 10 has a voltage output, the energy storage inverter 7 outputs an initial voltage through the normally closed relay 6 and the second diode 4 to wake up the battery management system BMS9;

[0049] The battery management system BMS9 is set to:

[0050] After detecting the initial voltage, the energy storage inverter 7 is controlled to prohibit the instruction battery 10 from discharging and force the energy storage inverter 7 to charge the battery 10 through the main circuit, and the charging current is not greater than the current limit value;

[0051] When it is detected that the power level of the battery 10 reaches the power supply threshold of the battery management system BMS9, the normally closed relay 6 is controlled to be disconnected, cutting off the power supply channel from the energy storage inverter 7 to the battery management system BMS9. The battery 10 then supplies power to the battery management system BMS9, and the battery system is automatically activated.

[0052] As those skilled in the art will appreciate, even if the remaining power of the battery 10 is 0, the low-power wake-up circuit can still directly wake up the battery management system BMS9 through the voltage of the energy storage inverter 7 (such as 48V). After 1,000 sample tests by the inventors, the wake-up success rate was 100%. However, in the traditional wake-up solution, when there is less than 2% residual pressure in the battery 10, the wake-up failure rate exceeds 30%. In the case of no residual pressure, it is necessary to manually charge the battery 10 of the battery system directly by skipping the charge and discharge control switch, and then wake up the battery system after the power is sufficient for the BMS to operate normally.

[0053] Furthermore, the battery management system BMS9 of the present application automatically cuts off the low-power wake-up circuit when the power level of the battery 10 reaches the power supply threshold, and switches to independent power supply by the battery 10. The voltage fluctuation during the switching process is less than 50mV (measured by an oscilloscope), which can avoid restarting the load device.

[0054] Preferably, in some embodiments of the present application, the drain of the charging MOSFET 5 is connected to the drain of the discharging MOSFET 8 .

[0055] Preferably, in some embodiments of the present application, the anode of the first diode 3 is connected to the anode of the second diode 4 .

[0056] Preferably, in some embodiments of the present application, the current limiting value is 1A.

[0057] Preferably, in some embodiments of the present application, the current limit value is dynamically corrected in real time based on the battery cell temperature and / or the remaining power of the battery 10, and the correction formula is as follows:

[0058] ;

[0059] Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

[0060] Furthermore, in the formula, Indicates the temperature correction part, Indicates the SOC correction part.

[0061] As those skilled in the art will appreciate, at the current limit value I limit During the real-time dynamic correction calculation process: the maximum allowable charging current I of the battery 10 maxThe real-time temperature T of the battery 10 is obtained in real time by the battery cell temperature acquisition sensor 2, T mid For the optimal temperature of the battery, battery manufacturers usually clearly recommend an operating temperature range (such as 0°C~45°C) in technical documents and mark the optimal performance temperature (such as 25°C); the remaining power SOC is obtained in real time through the battery management system BMS9; SOC high The SOC current limiting starting point, i.e., the starting battery power threshold for triggering the SOC current limiting, can be preset by those skilled in the art as needed;

[0062] Temperature correction slope coefficient k T Used to control temperature deviation (TT mid ) for the current limit value I limit The impact strength, SOC correction slope coefficient k s Used to control the SOC range (SOC−SOC high ) affects the attenuation of the current limit value, k T and k s It can be obtained through experiments and mathematical fitting based on different types of batteries. The limiting law of temperature and SOC on current can be found through experiments, and then the coefficient k can be calculated in reverse using the formula T and k s .

[0063] For example, in some embodiments of the present application, k T and k s You can obtain it in the following ways:

[0064] k T It can be obtained through the following methods:

[0065] At a specific temperature, gradually increase the battery charging current until the battery triggers a protection condition (such as voltage over-limit, temperature surge, lithium deposition, etc.). The current at this time is the I limit ; At this time, through the formula: , perform data fitting, and reversely calculate k T .

[0066] k s It can be obtained through the following methods:

[0067] Under the selected SOC, gradually increase the battery charging current until the battery triggers a protection condition (such as voltage over limit, temperature rise, lithium deposition, etc.). The current at this time is the I limit ; At this time, through the formula: , perform data fitting, and reversely calculate k S .

[0068] According to another aspect of the present application, the present application further provides a circuit control method for automatically waking up a battery system, including the circuit of any one of the above embodiments, the control method comprising:

[0069] The energy storage inverter 7 starts itself and instructs the battery 10 to discharge;

[0070] When the energy storage inverter 7 issues a discharge command but does not detect that the battery 10 has a voltage output, the energy storage inverter 7 outputs an initial voltage through the normally closed relay 6 and the second diode 4 to wake up the battery management system BMS9;

[0071] After the battery management system BMS9 detects the initial voltage, it controls the energy storage inverter 7 to prohibit the instruction battery 10 from discharging and forces the energy storage inverter 7 to charge the battery 10 through the main circuit, and the charging current is not greater than the current limit value;

[0072] When the battery management system BMS9 detects that the power level of the battery 10 reaches the power supply threshold of the battery management system BMS9, it controls the normally closed relay 6 to disconnect, cutting off the power supply channel from the energy storage inverter 7 to the battery management system BMS9, and the battery 10 supplies power to the battery management system BMS9, and the battery system is automatically activated.

[0073] Preferably, in some embodiments of the present application, the current limit value is dynamically corrected in real time based on the battery cell temperature and / or the remaining power of the battery 10, and the correction formula is as follows:

[0074] ;

[0075] Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

[0076] Furthermore, in the formula, Indicates the temperature correction part, Indicates the SOC correction part.

[0077] Specifically, in some embodiments of the present application, after the energy storage inverter is connected, the low-power wake-up circuit supplies power to the battery management system BMS9 through the normally closed relay 6 and the second diode, and the battery management system BMS9 wakes up.

[0078] For example, if the real-time detection temperature of the battery cell is -10°C and the SOC is 3%, and the power supply threshold of the battery management system BMS9 is 5%, the battery management system BMS9 detects a temperature of -10°C and an SOC of 3%, the dynamically calculated current limit value is:

[0079] ;

[0080] That is, the battery management system (BMS9) adjusts the current energy storage inverter to charge at 0.15A in real time. When the SOC reaches 5%, the relay is disconnected, switching to battery 10 for independent power supply. At this point, only 0.15A of current is required to maintain the BMS in standby mode, reducing power consumption by 85% compared to traditional wake-up circuits (typically >1A).

[0081] According to another aspect of the present application, the present application further provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, the control method of any one of the above embodiments can be implemented.

[0082] The present application discloses a circuit, control method and storage medium for automatically waking up a battery system, which has a relatively simple structure and low cost. After the battery system is deeply discharged, the battery management system (BMS) can be powered by an external inverter, so that the BMS can restore its control capability and realize intelligent automatic wake-up of the battery system. At the same time, the charging current limit value of the battery after deep discharge can be dynamically corrected in real time based on the battery cell temperature and / or the remaining battery power. By selecting the highest current limit value within the threshold of the charging current limit value to slowly charge the battery, the charging efficiency is improved and permanent damage to the battery caused by high current charging is avoided.

[0083] The above describes the preferred embodiments of the present application. It should be understood that the present application is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present application without departing from the scope of the technical solutions of the present application, or modify them into equivalent embodiments with equivalent changes, which does not affect the substantive content of the present application. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application that do not depart from the content of the technical solutions of the present application are still within the scope of protection of the technical solutions of the present application.

Claims

1. A circuit for automatically waking up a battery system, characterized in that: The circuit comprises: Main circuit: The positive pole of the battery is connected in series with the charging MOSFET and the discharging MOSFET and finally connected to the positive pole of the energy storage inverter, and the negative pole of the battery is connected to the negative pole of the energy storage inverter; Low-power wake-up circuit: one end is connected to the positive electrode of the battery, and is connected in series with a first diode, a second diode, and a normally closed relay, and finally connected to the positive electrode of the energy storage inverter; Battery management system BMS: a first end of which is connected to the battery cell voltage acquisition sensor, a second end of which is connected to the battery cell temperature acquisition sensor, a third end of which is connected to the normally closed relay, a fourth end of which is connected between the first diode and the second diode, and a fifth end of which is connected to the negative electrode of the battery; The energy storage inverter is configured as follows: Self-starting and instructing the battery to discharge; when the energy storage inverter issues a discharge instruction but does not detect that the battery has a voltage output, the energy storage inverter outputs an initial voltage through the normally closed relay and the second diode to wake up the battery management system BMS; The battery management system BMS is configured as follows: After detecting the initial voltage, the energy storage inverter is controlled to prohibit the battery from being discharged and to force the energy storage inverter to charge the battery through the main circuit, with the charging current not exceeding the current limit value. When it is detected that the battery power reaches the power supply threshold of the battery management system BMS, the normally closed relay is controlled to be disconnected, thereby cutting off the power supply channel from the energy storage inverter to the battery management system BMS. The battery supplies power to the battery management system BMS, and the battery system is automatically activated.

2. The circuit according to claim 1, wherein: The drain of the charging MOSFET is connected to the drain of the discharging MOSFET.

3. The circuit according to claim 1, wherein: An anode of the first diode is connected to an anode of the second diode.

4. The circuit according to claim 1, wherein: The current limiting value is 1A.

5. The circuit according to claim 1, wherein: The current limit value is dynamically modified in real time based on the battery cell temperature and / or the remaining battery capacity. The modification formula is as follows: ， Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

6. A circuit control method for automatically waking up a battery system, characterized in that: The circuit according to any one of claims 1 to 5, wherein the control method comprises: The energy storage inverter starts itself and instructs the battery to discharge; When the energy storage inverter issues a discharge instruction but does not detect that the battery has a voltage output, the energy storage inverter outputs an initial voltage through the normally closed relay and the second diode to wake up the battery management system BMS; After detecting the initial voltage, the battery management system BMS controls the energy storage inverter to prohibit discharging of the battery and forces the energy storage inverter to charge the battery through the main circuit, with the charging current being no greater than a current limit value; When the battery management system BMS detects that the power level of the battery reaches the power supply threshold of the battery management system BMS, it controls the normally closed relay to disconnect, cuts off the power supply channel from the energy storage inverter to the battery management system BMS, and the battery supplies power to the battery management system BMS, and the battery system is automatically activated.

7. The control method according to claim 6, characterized in that: The current limit value is dynamically modified in real time based on the battery cell temperature and / or the remaining battery capacity. The modification formula is as follows: ， Among them, I limit is the current limit value, I max is the maximum allowable charging current of the battery, k T is the temperature correction slope coefficient, T is the real-time temperature of the battery, T mid is the optimal temperature of the battery, SOC is the remaining capacity, k s SOC correction slope coefficient, SOC high It is the starting point of SOC current limiting.

8. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the control method according to any one of claims 6 to 7 is implemented.

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