Circuit for automatically awakening battery system, control method and storage medium

Abstract

The invention discloses a circuit for automatically waking up a battery system, a control method and a storage medium, and the circuit comprises a main loop: the positive electrode of a battery is sequentially connected in series with a charging Mos tube and a discharging Mos tube, and is finally connected to the positive electrode of an energy storage inverter, and the negative electrode of the battery is connected to the negative electrode of the energy storage inverter; one end of the low-power-consumption wake-up loop is connected to the positive electrode of the battery, is sequentially connected in series with a first diode, a second diode and a normally-closed relay, and is finally connected to the positive electrode of the energy storage inverter; the first end of the BMS is connected to the cell voltage acquisition sensor of the battery, the second end of the BMS is connected to the cell temperature acquisition sensor of the battery, the third end of the BMS is connected to the normally closed relay, the fourth end of the BMS is connected between the first diode and the second diode, and the fifth end of the BMS is connected to the negative electrode of the battery. According to the invention, low-power-consumption automatic wakeup and safe activation of the battery system can be realized.

Description

Technical Field

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

[0002] After the battery system is deeply discharged, in order to reduce power consumption and at the same time protect the battery from permanent damage, usually the battery management system BMS will control the battery to enter the sleep state. After entering the sleep state, for the existing methods of waking up the battery, basically enough power inside the battery is required to supply power to the battery management system BMS, and then the battery system is woken up by external communication, voltage activation or restarting the battery. Once there is not enough power inside the battery to supply power to the battery management system BMS, the above activation methods will all lose their effects. At this time, only by manually bypassing the charge and discharge control switch to directly charge the battery of the battery system, and waiting until the power is sufficient for the BMS to work properly, and then waking up the battery system. These methods greatly increase the manual maintenance cost and increase the additional risk of manual charging. Summary of the Invention

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

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

[0005] Main circuit: The positive electrode of the battery is sequentially connected in series with a charging Mos tube and a discharging Mos tube and finally connected to the positive electrode of the energy storage inverter, and the negative electrode of the battery is connected to the negative electrode of the energy storage inverter;

[0006] Low-power wake-up circuit: One end is connected to the positive electrode of the battery, and is sequentially 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;

[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 configured to:

[0009] Self-start and command the battery to discharge;

[0010] When the energy storage inverter issues a discharge command but does not detect a 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, control the energy storage inverter to prohibit the battery from discharging and force the energy storage inverter to charge the battery through the main circuit, and the charging current shall not be greater than the current limiting value;

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

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

[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 limiting value is dynamically corrected in real time based on the cell temperature and / or the remaining battery power, and the correction formula is as follows:

[0018] ;

[0019] Wherein, I limit is the current limiting 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 power, k s is the SOC correction slope coefficient, SOC high is the SOC current limiting starting point.

[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, and the control method includes:

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

[0022] When the energy storage inverter issues a discharge command but no voltage output of the battery is detected, 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, with the charging current not exceeding the current limit value.

[0024] When the BMS detects that the battery's power reaches the power supply threshold of the BMS, it controls the normally closed relay to disconnect, cutting off the power supply channel from the energy storage inverter to the BMS, and the battery powers the 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 cell temperature and / or the remaining battery power, and the correction formula is as follows:

[0026] ;

[0027] Where, 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 power, k s is the SOC correction slope coefficient, SOC high is the SOC current limit starting point.

[0028] According to another aspect of the present application, the present application also 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 the present application, the above technical features of the present application and the technical features specifically described 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 repeated one by one here.

[0030] Compared with the prior art, the present application has the following technical effects:

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

[0032] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more obvious.

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

[0034] Reference numerals: 1 cell voltage acquisition sensor; 2 cell temperature acquisition sensor; 3 first diode; 4 second diode; 5 charging Mos tube; 6 normally closed relay; 7 energy storage inverter; 8 discharging Mos tube; 9 battery management system BMS; 10 battery. Detailed implementation manners

[0035] To make the objectives, technical solutions, beneficial effects and remarkable progress of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, all the described embodiments are only part of the embodiments of the present application, rather than all the embodiments; based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

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

[0037] The mention of "embodiment" in this article means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this article. This phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments in this article can be combined with other embodiments without structural conflicts.

[0038] In the description of this article, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", and "connection" should be understood in a broad sense. It can be a movable connection, a fixed connection or integrated, or it can be connected through a certain connecting piece. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0039] In the description of this article, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "horizontal", "longitudinal", "height", "length", "width", etc. are intended to accurately describe the embodiments and simplify the description, rather than limiting the parts or structures involved to have a specific orientation, be installed or operated in a specific orientation, and should not be construed as a limitation to the embodiments in this article.

[0040] In the description of this article, terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary-secondary relationship of the described technical features. In the description of this article, the meaning of "multiple" is at least two.

[0041] Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present application will now be described in detail, and examples thereof are shown in the drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0042] Figure 1 A schematic diagram of a circuit of an automatic wake-up battery system according to an embodiment of the present application is shown. As Figure 1 shown, a circuit of an automatic wake-up battery system of the present application includes:

[0043] Main circuit: The positive electrode of battery 10 is sequentially connected in series with a charging Mos tube 5 and a discharging Mos tube 8 and finally connected to the positive electrode of an energy storage inverter 7, and the negative electrode of 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 battery 10, and is sequentially connected in series with a first diode 3, a second diode 4, and a 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 a cell voltage acquisition sensor 1 of battery 10, its second end is connected to a cell temperature acquisition sensor 2 of 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 battery 10;

[0046] The energy storage inverter 7 is configured to:

[0047] Self-start and command battery 10 to discharge;

[0048] When the energy storage inverter 7 issues a discharge command but does not detect a voltage output from battery 10, 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 configured to:

[0050] After detecting the initial voltage, control the energy storage inverter 7 to prohibit commanding battery 10 to discharge and force the energy storage inverter 7 to charge battery 10 through the main circuit, and the charging current is not greater than the current limiting value;

[0051] When it is detected that the power of battery 10 reaches the power supply threshold of the battery management system BMS9, control the normally closed relay 6 to disconnect, cut off the power supply channel of the energy storage inverter 7 to the battery management system BMS9, and supply power to the battery management system BMS9 by battery 10, and the battery system is automatically activated.

[0052] As can be understood by those skilled in the art, even when 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 1000 sample tests by the inventor, the wake-up success rate is 100%. In the case of the traditional wake-up scheme where the battery 10 has a residual voltage less than 2%, the wake-up failure rate exceeds 30%. In the case of no residual voltage, it is necessary to charge the battery 10 of the battery system manually by skipping the charge and discharge control switch. After the power is sufficient for the BMS to work properly, then wake up the battery system.

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

[0054] Preferably, in some embodiments of the present application, the drain of the charging Mos tube 5 is connected to the drain of the discharging Mos tube 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 limiting value is dynamically corrected in real time based on the cell temperature and / or the remaining power of the battery 10. The correction formula is as follows:

[0058] ;

[0059] where, I limit is the current limiting 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 power, k s is the SOC correction slope coefficient, SOC high is the SOC current limiting starting point.

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

[0061] As can be understood by those skilled in the art, in the real-time dynamic correction calculation process of the current limiting value I limit : the maximum allowable charging current I maxis the calibrated value at the time of battery factory shipment; the real-time temperature T of the battery 10 is obtained in real time through the battery core temperature acquisition sensor 2, and T mid is the optimal temperature of the battery. Battery manufacturers usually clearly recommend the operating temperature range (such as 0°C to 45°C) in technical documents and mark the optimal performance temperature (such as 25°C); the remaining battery capacity SOC is obtained in real time through the battery management system BMS9; SOC high is the starting point of SOC current limiting, that is, the starting battery capacity threshold for triggering SOC current limiting, which can be preset by those skilled in the art according to needs;

[0062] Temperature correction slope coefficient k T is used to control the influence intensity of the temperature deviation (T - T mid ) on the current limiting value I limit , and the SOC correction slope coefficient k s is used to control the attenuation influence degree of the SOC interval (SOC - SOC high ) on the current limiting value. k T and k s can be obtained through experiments and mathematical fitting based on different types of batteries. By conducting experiments to find the limiting rules of temperature and SOC on current, and then using formulas to calculate the coefficient k T and k s .

[0063] For example, in some embodiments of the present application, k T and k s can be obtained in the following way:

[0064] k T can be obtained in the following way:

[0065] At a specific temperature, gradually increase the charging current of the battery until the battery triggers the protection condition (such as voltage overlimit, temperature sudden rise, lithium plating, etc.). At this time, the current is the I limit under this condition; at this time, through the formula: , data fitting is performed, and k T can be obtained inversely.

[0066] k s can be obtained in the following way:

[0067] At the selected SOC, gradually increase the charging current of the battery until the battery triggers the protection condition (such as voltage overlimit, temperature sudden rise, lithium plating, etc.). At this time, the current is the I limit under this condition; at this time, through the formula: , data fitting is performed, and k S can be obtained inversely.

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

[0069] The energy storage inverter 7 starts self - activation and commands the battery 10 to discharge;

[0070] When the energy storage inverter 7 issues a discharge command but does not detect a voltage output from the battery 10, 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 commanding the battery 10 to discharge 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 - limiting value;

[0072] When the battery management system BMS9 detects that the power 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 of 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 - limiting value is dynamically corrected in real - time based on the cell temperature and / or the remaining power of the battery 10, and the correction formula is as follows:

[0074] ;

[0075] Wherein, I limit is the current - limiting 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 power, k s is the SOC correction slope coefficient, SOC high is the SOC current - limiting starting point.

[0076] Furthermore, in the formula, represents the temperature correction part, represents 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 is woken up.

[0078] For example, when the real-time detected temperature of the battery cell is -10°C (low temperature) and the SOC = 3%, assuming that the power supply threshold of the battery management system BMS9 is 5%, the battery management system BMS9 detects the temperature of -10°C and the SOC = 3%, and dynamically calculates the current limit value as follows:

[0079] ;

[0080] That is, the battery management system BMS9 adjusts the current charging of the current energy storage inverter to 0.15A in real time. After the SOC reaches 5%, the relay is disconnected and switched to the autonomous power supply of the battery 10. At this time, only a current of 0.15A is required to maintain the standby of the BMS, and the power consumption is reduced by 85% compared with the traditional wake-up circuit (usually >1A).

[0081] According to another aspect of the present application, the present application also 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 circuit, control method and storage medium of an automatic wake-up battery system of the present application have 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 ability, and then the intelligent automatic wake-up of the battery system can be realized. 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 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 the permanent damage of the battery caused by large current charging is avoided.

[0083] The preferred embodiments of the present application have been described above. It should be understood that the present application is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications to the technical solution of the present application, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present application, which does not affect the essence of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the protection of the technical solution of the present application.

Claims

1. Circuit for automatically waking up a battery system, characterized in that, The circuit includes: Main circuit: The positive electrode of the battery is sequentially connected in series with a charging MOS transistor and a discharging MOS transistor and finally connected to the positive electrode of the energy storage inverter, and the negative electrode of the battery is connected to the negative electrode of the energy storage inverter; Low-power wake-up circuit: One end is connected to the positive electrode of the battery, and is sequentially 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: Its first end is connected to the cell voltage acquisition sensor of the battery, its second end is connected to the cell temperature acquisition sensor of the battery, 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; The energy storage inverter is set to: Self-start and command the battery to discharge; when the energy storage inverter issues a discharge command but does not detect a 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; The Battery Management System BMS is set to: After detecting the initial voltage, control the energy storage inverter to prohibit commanding the battery to discharge and force the energy storage inverter to charge the battery through the main circuit, and the charging current is not greater than the current limit value; when detecting that the battery power reaches the power supply threshold of the Battery Management System BMS, control the normally-closed relay to disconnect, cut off the power supply channel of the energy storage inverter to the Battery Management System BMS, and supply power to the Battery Management System BMS by the battery, and the battery system is automatically activated.

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

3. The circuit according to claim 1, characterized in that, The anode of the first diode is connected to the anode of the second diode.

4. The circuit according to claim 1, characterized in that, The current limit value is 1A.

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

6. Circuit control method for automatically waking up a battery system, characterized in that, Including the circuit according to any one of claims 1-5, the control method includes: The energy storage inverter self-starts and commands the battery to discharge; When the energy storage inverter issues a discharge command but does not detect a 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; After the Battery Management System BMS detects the initial voltage, control the energy storage inverter to prohibit commanding the battery to discharge and force the energy storage inverter to charge the battery through the main circuit, and the charging current is not greater than the current limit value; When the Battery Management System BMS detects that the battery power reaches the power supply threshold of the Battery Management System BMS, control the normally-closed relay to disconnect, cut off the power supply channel of the energy storage inverter to the Battery Management System BMS, and supply power to the Battery Management System BMS by the battery, and the battery system is automatically activated.

7. The control method according to claim 6, characterized in that, The current limit value is dynamically corrected in real time based on the cell temperature and / or the remaining battery power, and the correction formula is as follows: ， Among them, I limit is the current limiting 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 battery capacity, k s is the SOC correction slope coefficient, SOC high 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 instruction is executed by the processor, implement the control method according to any one of claims 6-7.

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