Battery management system, battery system and energy storage device

Abstract

The utility model discloses a battery management system, a battery system and an energy storage device. The battery management system comprises a communication processing chip and a power supply chip. Wherein the communication processing chip is provided with a power supply end; the power supply chip is provided with an anode input end, a voltage conversion circuit and a first reference voltage end; the anode input end is used for connecting an anode of a battery, and the first reference voltage end is connected with the power supply end; the voltage conversion circuit comprises a first voltage conversion branch, a second voltage conversion branch and a first switch tube. Each voltage conversion branch is connected with the positive input end and is used for converting voltage input by the positive input end into first reference voltage; and the first switch tube is used for conducting one of the first voltage conversion branch and the second voltage conversion branch with the first reference voltage end. Stable power supply to the communication processing chip is ensured, and the stability of the system is improved.

Description

Technical Field

[0001] The present application relates to the field of electricity, and more specifically to a battery management system, a battery system and an energy storage device. Background Art

[0002] The battery system of electric two-wheeled vehicles, electric three-wheeled vehicles and other vehicles includes batteries and battery management systems. Among them, the battery management system has functions such as but not limited to real-time collection, processing, and storage of important information during battery operation, as well as information exchange with external devices. In the related art, there is a method of using a 4G communication module to replace the original MCU (micro control unit) module in the battery management system to integrate the 4G communication module into the battery management system, but this solution cannot guarantee the stability of power supply to the 4G communication module. Utility Model Content

[0003] The utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a battery management system is provided, the battery management system includes a communication processing chip and a power chip; wherein the communication processing chip has a power supply terminal; the power supply chip has a positive input terminal, a voltage conversion circuit and a first reference voltage terminal; the positive input terminal is used to connect the positive electrode of the battery, and the first reference voltage terminal is connected to the power supply terminal; the voltage conversion circuit includes: a first voltage conversion branch, a second voltage conversion branch and a first switch tube; each of the voltage conversion branches is connected to the positive input terminal, and is used to convert the voltage input from the positive input terminal into a first reference voltage; the first switch tube is used to make one of the first voltage conversion branch and the second voltage conversion branch conductive with the first reference voltage terminal.

[0004] In one embodiment of the present application, the first end of the first switch tube is connected to the output end of the first voltage conversion branch, the second end of the first switch tube is connected to the first reference voltage end, and the control end of the first switch tube is connected to the output end of the second voltage conversion branch; when the first reference voltage is output at the output end of the second voltage conversion branch, the first switch tube is disconnected; when the output end of the second voltage conversion branch stops outputting the first reference voltage, the first switch tube is turned on.

[0005] In one embodiment of the present application, the first voltage conversion branch includes: a first Zener follower circuit, a second Zener follower circuit and a linear regulator connected in series in sequence; wherein the input end of the first Zener follower circuit is connected to the positive input end, and the output end of the linear regulator is connected to the first reference voltage end through the first switch tube.

[0006] In one embodiment of the present application, the power supply chip also has a second reference voltage terminal; wherein the output terminal of the first Zener follower circuit is also connected to the second reference voltage terminal, for converting the voltage inputted from the positive input terminal into a second reference voltage; the second Zener follower circuit and the linear regulator are used to convert the second reference voltage into the first reference voltage.

[0007] In one embodiment of the present application, the second voltage conversion branch includes: a first BUCK circuit, used to convert the voltage input to the positive input terminal into the first reference voltage; wherein the input terminal of the first BUCK circuit is connected to the positive input terminal, and the output terminal of the BUCK circuit is connected to the first reference voltage terminal.

[0008] In one embodiment of the present application, the power chip also includes: a second switch tube, a first end of the second switch tube is connected to the ground end, a second end of the second switch tube is connected to the positive input end, and the second end of the second switch tube is also connected to the input ends of the first voltage conversion branch and the second voltage conversion branch; the communication processing chip is connected to the control end of the second switch tube, for controlling the conduction and shutdown of the second switch tube; and when the second switch tube is turned on, the first voltage conversion branch and the second voltage conversion branch stop working.

[0009] In one embodiment of the present application, the communication processing chip includes: a power on / off signal input terminal, a third switch tube and a delay circuit; wherein the power on / off signal input terminal is used to receive a power on / off signal; the first end of the third switch tube is connected to the power on / off signal input terminal, and the second end of the third switch tube is connected to the ground terminal; the delay circuit is connected between the power supply terminal and the control end of the third switch tube, and is used to delay turning on the third switch tube when the power supply terminal inputs a power on / off signal to the power on / off signal input terminal.

[0010] In one embodiment of the present application, the delay circuit includes: a fourth switch tube, an RC series circuit, and a first diode and a second capacitor connected in series; wherein the first end of the fourth switch tube is connected to the power supply end, and the second end of the fourth switch tube is connected to the control end of the third switch tube; the RC series circuit includes a first resistor and a first capacitor connected in series; wherein the first resistor is connected between the first capacitor and the power supply end, and the first capacitor is connected between the ground end and the first resistor; the cathode of the first diode is connected to the power supply end, the anode of the first diode is connected to the first end of the second capacitor and the control end of the third switch tube, and the second end of the second capacitor is connected to the ground end.

[0011] In one embodiment of the present application, the delay circuit also includes: an RC parallel circuit, a first end of the RC parallel circuit is connected to the ground end, and a second end of the RC parallel circuit is connected between the second end of the fourth switch tube and the control end of the third switch tube.

[0012] In one embodiment of the present application, the communication processing chip is a 4G chip or a 5G chip.

[0013] According to a second aspect of the present application, a battery system is further provided, comprising: a battery, and any one of the above-mentioned battery management systems, wherein the positive electrode of the battery is connected to the positive electrode input terminal.

[0014] According to a third aspect of the present application, there is also provided an energy storage device, which includes any one of the battery systems described above.

[0015] According to the battery management system, battery system and energy storage device provided in the embodiments of the present application, two voltage conversion branches and a first switch tube are set in the power supply chip for the first reference voltage terminal connected to the power supply terminal of the communication processing chip. The two voltage conversion branches can convert the voltage input from the positive input terminal into a first reference voltage. The first switch tube can make one of the two conversion branches conductive with the first reference voltage terminal. Therefore, when one of the voltage conversion branches cannot stably output the first reference voltage, the first switch tube switches to another voltage conversion branch to output the first reference voltage to the first reference voltage terminal, thereby ensuring stable power supply to the communication processing chip and increasing the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic block diagram of a battery management system according to an embodiment of the present utility model;

[0018] Figure 2 A circuit topology diagram of a power chip according to an embodiment of the present utility model;

[0019] Figure 3 A schematic diagram of a communication processing chip according to an embodiment of the present utility model;

[0020] Figure 4 A circuit topology diagram of a delay circuit shown in an embodiment of the utility model;

[0021] Figure 5 A schematic block diagram of a battery management system according to another embodiment of the present utility model;

[0022] Figure 6 This is a schematic block diagram of an energy storage device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0024] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0025] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0026] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0027] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] Although there is a solution in the related art to integrate the 4G communication module into the battery management system, this solution simply replaces the MCU module in the battery management system with the 4G communication module, and the stability of the power supply to the 4G communication module cannot be guaranteed. The battery management system is BMS, which is used to monitor the battery status and ensure the safe operation of the battery. Among them, the MCU module is a micro control unit (Micro controller Unit), which is used to run software and store operation data, and drive the charge and discharge control MOS circuit according to the collected battery information. The above-mentioned technical problems existing in the related art can be solved by the technical solutions shown in some embodiments of the present application.

[0029] The present application embodiment provides a battery management system, referring to Figure 1 The battery management system includes a communication processing chip and a power supply chip; wherein the communication processing chip has a power supply terminal; the power supply chip has a positive input terminal, a voltage conversion circuit and a first reference voltage terminal; the positive input terminal is used to connect the positive electrode of the battery, and the first reference voltage terminal is connected to the power supply terminal; the voltage conversion circuit includes: a first voltage conversion branch, a second voltage conversion branch and a first switch tube; each voltage conversion branch is connected to the positive input terminal, and is used to convert the voltage input from the positive input terminal into a first reference voltage; the first switch tube is used to make one of the first voltage conversion branch and the second voltage conversion branch conductive with the first reference voltage terminal.

[0030] In the above scheme, for the first reference voltage terminal connected to the power supply terminal of the communication processing chip, two voltage conversion branches and a first switch tube are set in the power supply chip, and the two voltage conversion branches can convert the voltage input from the positive input terminal into the first reference voltage. The first switch tube can make one of the two conversion branches conductive with the first reference voltage terminal, so that when one of the voltage conversion branches cannot stably output the first reference voltage, the first switch tube switches to another voltage conversion branch to output the first reference voltage to the first reference voltage terminal, thereby ensuring stable power supply to the communication processing chip and increasing the stability of the system. The above structures are described in detail below in conjunction with the accompanying drawings.

[0031] When setting the communication processing chip, the communication processing chip can be any chip that has both logical operations and communication with external communication devices. Exemplarily, the communication processing chip can be a 4G chip or a 5G chip, so that the 4G chip or the 5G chip can be integrated into the battery management system. Exemplarily, refer to Figure 5 The communication processing chip used in the battery management system shown is a 4G chip. Of course, in other embodiments, the communication processing chip can be a 5G chip.

[0032] refer to Figure 1A power supply terminal is provided on the communication processing chip, and the power supply terminal can be a connector such as a pin, a pad, or a plug interface on the communication processing chip that can be connected to the outside. The power supply terminal is connected to the first reference voltage terminal on the power chip to supply power to the communication processing chip through the power supply terminal. The power supply terminal can be connected to the Vbus (power bus) in the communication processing chip to supply power to each logic control module of the communication processing chip with the electric energy of the first reference voltage provided by the outside through the power supply terminal, so that the communication processing chip can perform various types of functions such as but not limited to logical operations and external communications.

[0033] When setting up a power chip, the power chip is used to convert the voltage output from the battery output terminal into various types of reference voltages, and use the reference voltages to power various types of loads. That is, the power chip is connected to the battery, and the battery voltage is stepped down to provide power to the battery management system. The power chip is provided with a positive input terminal, a reference voltage, and a positive input terminal. Figure 5 The positive input terminal is used to connect to the positive electrode of the battery. In other embodiments, the power chip may also have a negative input terminal, which is connected to the negative electrode of the battery. The positive input terminal may be a pin, a pad, a plug interface, or other connector on the power chip that can be electrically connected to an external wire or wiring.

[0034] refer to Figure 5 A first reference voltage terminal is provided on the power chip, and the first reference voltage terminal is used to output a first reference voltage. Figure 1 , Figure 2 and Figure 4 The first reference voltage terminal can be connected to the power supply terminal of the communication processing chip to input the power of the first reference voltage to the communication processing chip. Figure 2 , the first reference voltage may be 3.8V. For example, the reference voltage Figure 2 The power chip may also be provided with a second reference voltage terminal, which is used to output a second reference voltage to the outside. Figure 2 , the second reference voltage may be 15V, and the MOS tube driving circuit in the power management system is connected to the second reference voltage. Figure 2 The power chip may also be provided with a third reference voltage terminal, which is used to output a third reference voltage to the outside. Figure 2 , the third reference voltage may be 5 V. When setting each reference voltage terminal, any connector that can be connected to an external wire or wiring may be used, such as but not limited to a pin, a pad, or a plug interface.

[0035] refer to Figure 1 and Figure 2A voltage conversion circuit is provided in the power chip, and the voltage conversion circuit is used to convert the voltage input from the positive input terminal into reference voltages of various types and sizes. For example, the voltage conversion circuit is used to convert the voltage input from the positive input terminal into reference voltages of 3.8V, 5V, 15V, etc., and output them from the first reference voltage terminal, the second reference voltage terminal, and the third reference voltage terminal of the power chip respectively.

[0036] When setting up the voltage conversion circuit, refer to Figure 1 , the voltage conversion circuit includes: a first voltage conversion branch, a second voltage conversion branch and a first switch tube. Among them, each voltage conversion branch in the first voltage conversion branch and the second voltage conversion branch is connected to the positive input terminal. And each voltage conversion branch in the first voltage conversion branch and the second voltage conversion branch is used to convert the voltage input at the positive input terminal into a first reference voltage. That is, two voltage conversion branches are set in the voltage conversion circuit for the conversion of the first reference voltage, and each voltage conversion branch is used to convert the voltage input at the positive input terminal into the first reference voltage. When specifically setting the first voltage conversion branch and the second voltage conversion branch, a variety of methods can be used. The following is an exemplary introduction to several setting methods.

[0037] Exemplary, reference Figure 2 , the first voltage conversion branch may include: a first Zener follower circuit, a second Zener follower circuit and a linear regulator connected in series in sequence. The input end of the first Zener follower circuit is connected to the positive input end of the power chip, and the output end of the linear regulator is connected to the first reference voltage end through the first switch tube. By setting two Zener follower circuits and a linear regulator, and connecting them in series in sequence, the voltage input at the positive input end can be converted into the first reference voltage.

[0038] Exemplary, reference Figure 2 The power chip also has a second reference voltage terminal, the output terminal of the first Zener follower circuit can also be connected to the second reference voltage terminal, and the first Zener follower circuit is used to convert the voltage input from the positive input terminal into the second reference voltage. Figure 2 , the MOS driving circuit in the battery management system can be connected to the third reference voltage terminal. At this time, the second Zener follower circuit and the linear regulator are used to convert the second reference voltage into the first reference voltage. Figure 2, the first Zener follower circuit is used to convert the voltage inputted from the positive input terminal into a second reference voltage of 15V, and the second Zener follower circuit and the linear regulator are used to further reduce the second reference voltage of 15V to a first reference voltage of 3.8V. That is, the first reference voltage is less than the second reference voltage. By adopting this setting mode, the first Zener follower circuit can be reused in different reference voltage conversion processes, thereby improving the utilization efficiency of the device, and at the same time, the number of Zener follower circuits set in the power chip can be reduced, thereby reducing the cost.

[0039] Exemplary, reference Figure 2 , the second voltage conversion branch may include: a first BUCK circuit, the first BUCK circuit is used to convert the voltage input from the positive input terminal into a first reference voltage. Among them, the input terminal of the first BUCK circuit is connected to the positive input terminal, and the output terminal of the BUCK circuit is connected to the first reference voltage terminal. That is, the second voltage conversion branch uses a BUCK circuit to achieve voltage conversion. At this time, the first voltage conversion branch and the second voltage conversion branch use voltage conversion devices with different principles, thereby reducing the probability of the first voltage conversion branch and the second voltage conversion branch failing at the same time, thereby improving the stability of power supply to the communication processing chip.

[0040] When setting up the first BUCK circuit, refer to Figure 2 The first BUCK circuit may be provided with a high-power MOS tube, and the first BUCK circuit converts the voltage outputted from the positive input terminal into the first reference voltage through the switch control of the high-power MOS tube. When specifically connected, the two current-passing terminals of the high-power MOS tube are respectively connected between the positive input terminal and the first BUCK circuit, and the control terminal of the high-power MOS tube is connected to the positive input terminal through the current-limiting resistor R5. For example, reference Figure 2 , the first BUCK circuit can be configured to support a maximum output of 3A.

[0041] Exemplary, reference Figure 2 A second BUCK circuit may be provided between the positive input terminal and the third reference voltage terminal, and the second BUCK circuit is used to convert the voltage inputted from the positive input terminal into the third reference voltage. Figure 2 The second BUCK circuit and the first BUCK circuit can use the same high-power MOS tube to achieve multiplexing of the high-power MOS tube.

[0042] It should be understood that the configuration of the voltage conversion branch is shown only as an example, and other configurations may also be used.

[0043] refer to Figure 1 and Figure 2The conversion circuit is further provided with a first switch tube, and the first switch tube is used to connect one of the first voltage conversion branch and the second voltage conversion branch to the first reference voltage terminal. Figure 2 Q1 in the figure represents the first switch tube. Figure 1 and Figure 2 As shown, the first reference tube is connected to the output end of the first voltage conversion branch and the second voltage conversion branch, and is used to control whether the first voltage conversion branch is connected to the first reference voltage end, or the second voltage conversion branch is connected to the first reference voltage end. For the first reference voltage end connected to the power supply end of the communication processing chip, two voltage conversion branches and a first switch tube are set in the power supply chip. Both voltage conversion branches can convert the voltage input from the positive input end into the first reference voltage. The first switch tube can make one of the two conversion branches connected to the first reference voltage end, so that when one of the voltage conversion branches cannot stably output the first reference voltage, the first switch tube switches to another voltage conversion branch to output the first reference voltage end, thereby ensuring stable power supply to the communication processing chip and increasing the stability of the system. For example, the second voltage conversion branch can be preferentially connected to the first reference voltage end; when the output end of the second voltage conversion branch can no longer output the first reference voltage, the first voltage conversion branch can be connected to the first reference voltage end. To reliably and stably supply power to the communication processing chip. When setting the first switch tube, multiple methods can be used.

[0044] Exemplary, reference Figure 2 The first switch tube has two current-passing ends and a control end, wherein the two current-passing ends are respectively the first end and the second end of the first switch tube. The first end of the first switch tube is connected to the output end of the first voltage conversion branch, the second end of the first switch tube is connected to the first reference voltage end, and the control end of the first switch tube is connected to the output end of the second voltage conversion branch. When the output end of the second voltage conversion branch outputs the first reference voltage, the first switch tube is disconnected, so that the second voltage conversion branch is connected to the first reference voltage end. When the output end of the second voltage conversion branch stops outputting the first reference voltage, the first switch tube is turned on, so that the first voltage conversion branch is connected to the first reference voltage end. Regarding the type of the first switch tube, switching devices such as but not limited to MOS tubes and triodes can be used.

[0045] Exemplary, reference Figure 2 The power chip also includes a second switch tube, such as Figure 2 Q2 in the figure represents a second switch tube. As for the type of the second switch tube, a switch device such as, but not limited to, a MOS tube, a triode, etc. can be used. The second switch tube has two current-passing terminals and a control terminal, wherein the two current-passing terminals are respectively a first terminal and a second terminal. For example, refer to Figure 2, the first end of the second switch tube is connected to the ground end, the second end of the second switch tube is connected to the positive input end, and the second end of the second switch tube is also connected to the input ends of the first voltage conversion branch and the second voltage conversion branch. The communication processing chip is connected to the control end of the second switch tube, and the communication processing chip is also used to control the conduction and shutdown of the second switch tube. When the communication processing chip controls the second switch tube to be turned on, the input ends of the first voltage conversion branch and the second voltage conversion branch, as well as the positive input end, can be turned on to the ground end, thereby enabling the first voltage conversion branch and the second voltage conversion branch to stop working. In application, before the communication processing chip is shut down, the second switch tube can be controlled to be turned on, thereby stopping the first voltage conversion branch and the second voltage conversion branch that supply power to the communication processing chip, thereby reducing the energy consumption of the voltage conversion branch. Exemplarily, refer to Figure 2 , the second end of the second switch tube can also be connected to the input end of the second BUCK circuit, so that when the communication processing chip controls the second switch tube to be turned on, the input end of the second BUCK circuit can also be turned on with the ground end, so that the second BUCK circuit can stop working.

[0046] Exemplary, reference Figure 2 A current limiting resistor R6 may be further provided between the second end of the second switch tube and the current limiting resistor R5, and the control end of the high-power MOS tube is connected between the current limiting resistor R5 and the current limiting resistor R6.

[0047] Exemplarily, the communication processing chip and the control end of the second switch tube can be connected through a current limiting resistor R3. Exemplarily, the communication processing chip and the control end of the second switch tube can be connected through a second diode D2, the positive electrode of the second diode D2 is connected to the communication processing chip, and the negative electrode of the second diode D2 is connected to the control end of the second switch tube, so as to prevent current backflow. Exemplarily, a surge protection circuit can be set between the negative electrode of the second diode and the control end of the second switch tube, and the setting method of the surge protection circuit can adopt a variety of methods. Exemplarily, refer to Figure 2 The surge protection circuit may include a transient voltage suppressor tube TVS and a resistor R4, wherein the transient voltage suppressor tube TVS and the resistor R4 are connected in parallel, wherein a first end formed by the transient voltage suppressor tube TVS and the resistor R4 in parallel is connected between the cathode of the second diode and the control end of the second switch tube, and a second end formed by the transient voltage suppressor tube TVS and the resistor R4 in parallel is connected to the ground end. For example, referring to Figure 2 An isolation capacitor C4 may also be additionally provided between the second end of the second switch tube and the ground end.

[0048] Exemplary, reference Figure 2 and Figure 5, select high-power MOS tubes to control two BUCK circuits to convert voltages of 5V and 3.8V respectively to power the communication module and the 4G chip. The maximum output current of the BUCK3.8V circuit is designed to be 3A to meet the power requirements of the 4G chip and ensure the normal startup and operation of the 4G chip. At the same time, the total voltage of the battery is stepped down to 15V through the first Zener follower circuit to power the MOS drive circuit. In view of the increase in power consumption caused by changes in usage scenarios, the 15V drive voltage may be lowered. The embodiment of the present application further optimizes the power supply scheme, and a second Zener follower circuit and an adjustable linear regulator are added after the 15V voltage to convert the voltage to 3.8V to power the 4G chip. When the first BUCK circuit outputs a 3.8V voltage, the 4G chip uses the 3.8V power of the first BUCK circuit. When the 3.8V voltage of the first BUCK circuit does not exist, the 4G chip will use the first voltage conversion branch, which reduces the risk of abnormal battery charging and discharging caused by the instability of the MOS drive circuit and enhances the reliability of the system.

[0049] Exemplary, reference Figure 3 and Figure 4 The communication processing chip may include: a power on / off signal input terminal, a third switch tube and a delay circuit. The power on / off signal input terminal is used to receive a power on / off signal, such as Figure 4 The PWRKEY in the figure indicates the power on / off signal input terminal. Figure 4Q3 in the figure represents the second switch tube. Regarding the type of the third switch tube, switch devices such as but not limited to MOS tubes and triodes can be used. The third switch tube has two flow-through ends and a control end, wherein the two flow-through ends are respectively a first end and a second end. The first end of the third switch tube is connected to the switch signal input end, and the second end of the third switch tube is connected to the ground end. The delay circuit is connected between the power supply end and the control end of the third switch tube, and is used to delay the conduction of the third switch tube when the power supply end inputs the switch signal to the switch signal input end. That is, when the third switch tube is turned on, so that the switch signal input end and the ground end are turned on, the switch signal input end can identify and consider that the input of the power-on signal or the power-off signal is received, forming a switch signal input structure similar to a press switch. Of course, the third switch tube is not always turned on, but is turned off after a period of time, so that the switch signal input end can receive a pulse signal as the switch signal. Specifically, the first reference voltage end can input the switch signal pulse to the switch signal input end through the power supply end on the communication processing chip. And by adding a delay circuit between the control end and the power supply end of the third switch tube, when the power supply end supplies power to the control end of the third switch tube to input the power on / off signal, the delay circuit can delay the conduction of the third switch tube, thereby delaying and extending the conduction time of the third switch tube, avoiding the power on and off time being too short, causing irreversible damage to the communication processing chip, and increasing the stability of the system. When setting the delay circuit, a variety of methods can be used. The following are exemplary introductions to several setting methods.

[0050] Exemplary, reference Figure 4 The delay circuit may include: a fourth switch tube, an RC series circuit, and a first diode and a second capacitor connected in series. Figure 4 Q4 in the figure represents a fourth switch. Regarding the type of the fourth switch, a switch device such as, but not limited to, a MOS tube, a triode, etc. may be used. The fourth switch has two current-passing terminals and a control terminal, wherein the two current-passing terminals are respectively a first terminal and a second terminal. For example, refer to Figure 4 The first end of the fourth switch tube is connected to the power supply end, and the second end of the fourth switch tube is connected to the control end of the third switch tube. The RC series circuit includes a first resistor and a first capacitor connected in series, such as Figure 4 In the figure, R1 represents a first resistor, C1 represents a first capacitor, the first resistor is connected between the first capacitor and the power supply terminal, and the first capacitor is connected between the ground terminal and the first resistor. The first diode and the second capacitor are connected in series. Figure 4D1 in the figure represents the first diode, C2 represents the second capacitor, the cathode of the first diode is connected to the power supply end, the anode of the first diode is connected to the first end of the second capacitor and the control end of the third switch tube, and the second end of the second capacitor is connected to the ground end. When the power supply end supplies power to the control end of the third switch tube through the delay circuit, the first capacitor in the RC series circuit and the second capacitor in parallel need to be charged first, and only after the first capacitor and the second capacitor are fully charged can the fourth switch tube be triggered to turn on and send a current pulse signal, thereby achieving a delay effect. After the fourth switch tube is turned on, the first capacitor and the second capacitor can be gradually discharged, thereby increasing the duration of the fourth switch tube being turned on, thereby delaying the duration of the fourth switch tube being turned on.

[0051] Exemplary, reference Figure 4 The delay circuit may also include: an RC parallel circuit, wherein the RC parallel circuit is formed by connecting a resistor and a capacitor in parallel. Figure 4 The resistor R2 and the capacitor C3 in the RC parallel circuit constitute the capacitor and the resistor in the RC parallel circuit. The first end of the RC parallel circuit is connected to the ground terminal, and the second end of the RC parallel circuit is connected between the second end of the fourth switch tube and the control end of the third switch tube. That is, the first ends of the resistor R2 and the capacitor C3 are both connected to the ground terminal, and the second ends of the resistor R2 and the capacitor C3 are both connected between the second end of the fourth switch tube and the control end of the third switch tube, so that after the fourth switch tube is turned on to send a current pulse signal, the capacitor C3 needs to be charged first, and after the capacitor C3 in the RC parallel circuit is fully charged, the third switch tube can be turned on to input the switch signal to the switch signal input terminal. And after the third switch tube is turned on, the capacitor C3 in the RC parallel circuit can be gradually discharged, thereby increasing the duration of the third switch tube being turned on, thereby delaying the duration of the third switch tube being turned on.

[0052] Exemplary, reference Figure 4 , an isolation capacitor C5 may also be connected between the switch signal input terminal and the ground terminal. For example, refer to Figure 4 , a current limiting resistor R8 may be connected between the second end of the fourth switch tube and the control end of the third switch tube to limit the current. Figure 4 , a control terminal is also set on the communication processing chip, such as Figure 4 WAKEPWR in the figure represents a control terminal, which is connected to the control terminal of the third switch tube, so that the communication processing chip can automatically input a switch signal to the switch signal input terminal. Exemplarily, the control terminal and the control terminal of the third switch tube can be connected through a current limiting resistor R8 and a third diode D3, the current limiting resistor R8 is connected between the control terminal and the positive electrode of the third diode D3, and the negative electrode of the third diode D3 is connected between the current limiting resistor R8 and the control terminal of the third switch tube.

[0053] Exemplary, reference Figure 4 and Figure 5 , the PWRKEY pin (power on / off signal input terminal) of the 4G chip is recommended to have a pull-up and pull-down time of 2s to complete the power on / off action. For this purpose, a delay circuit is specially added, such as Figure 4 As shown, an RC circuit composed of a capacitor and a resistor is used to control the charging and discharging time of the capacitor and then control the on and off state of the third switch tube to achieve a delay effect, thereby avoiding short power-on and power-off time to cause irreversible damage to the 4G chip and increase system stability.

[0054] In some embodiments, a charger reverse connection protection circuit can be added to reduce the risk of users connecting the positive and negative poles incorrectly and burning fuses or devices during use. Compared with the reverse connection protection circuit composed of traditional reverse-parallel Schottky diodes, when the charger is reversely connected, the reverse connection protection circuit using MOS tubes is sufficient to pass a large current unimpeded while maintaining low loss. By selecting a suitable reverse connection circuit resistance value, the protection action delay is avoided to prevent the fuse from being blown due to excessive melting, thereby having a relatively long service life.

[0055] In some embodiments, a load detection circuit can be added. If the 4G chip is in sleep mode, when the load detection circuit detects the LOAD load access signal, the pre-discharge voltage acquisition circuit is turned on, and the 4G chip is awakened when the current reaches the set value, thereby increasing the convenience of the system.

[0056] Exemplary, reference Figure 5 and Figure 6 In some embodiments, the battery management system provided may also include an integrated system of a 4G Internet of Things module (composed of a 4G chip) and a BMS battery protection module. The 4G Internet of Things module and the BMS battery protection module are modularly integrated, and the Internet of Things management and control system using the Internet and mobile Internet, cloud storage, and big data technologies obtains the status of the power battery to achieve power control of electric vehicles, and achieves timely replacement, maintenance, and full-process tracking and management of shared lithium batteries for electric vehicles. It also includes a cloud platform and a mobile APP client that communicates with the cloud platform using wireless communication; the BMS battery protection module and the 4G chip communicate with the cloud platform through the intelligent Internet of Things.

[0057] For example, Figure 5 and Figure 6The six-in-one modular battery management system for two-wheeled electric vehicles based on the Internet of Things is shown. The BMS battery management module is integrated with the 4G Internet of Things module, and also includes a cloud platform and a mobile APP client for processing the data of each battery for wireless communication, obtaining the status of all batteries to achieve real-time control of the batteries and reasonable resource allocation; the BMS battery management module relies on the 4G module to communicate with the cloud platform for wireless communication to achieve the purpose of data interaction. The BMS battery management module includes an AFE front-end sampling module, a charge and discharge control MOS module, a communication module, and a power module, which are respectively connected to the 4G module; the AFE front-end acquisition module includes voltage acquisition, current acquisition, and temperature acquisition between battery cells; the charge and discharge control module performs charge and discharge control according to the battery voltage, current, and temperature information collected by the acquisition module; the mobile terminal APP is connected to the cloud platform signal.

[0058] Exemplary, reference Figure 5 and Figure 6 This example can effectively manage and warn lithium batteries, effectively preventing risks and theft caused by overcharging, over-discharging, overcurrent, overtemperature, short circuit, and abnormal balance of lithium batteries. The MCU chip is optimized on the existing basis, and the 4G chip replaces the MCU chip, which reduces costs while improving space utilization. In addition, the cloud platform processes battery-related data to achieve remote monitoring and real-time management of lithium batteries, and can provide the background service capability to solve current fault alarms based on operating data. Secondly, the 4G chip and BMS battery management system are remotely upgraded through the cloud platform, and the GPS module and GNSS module improve the accuracy of lithium battery positioning. At the same time, combined with the additional three-axis acceleration sensor, the battery movement status data is shared to the cloud platform, which improves the actual use of the product. Intuitive experience, it can achieve full battery power-off, fall alarm, improve battery utilization, and provide enterprises with the ability to remotely power off and lock the car in extreme abnormal or alarm conditions.

[0059] Exemplary, reference Figure 5 and Figure 6 The battery management system BMS six-in-one modular design system includes a battery management module BMS, an Internet of Things management service cloud platform, a three-axis acceleration sensor, a GPS and GNSS positioning system, a WIFISCAN module and a Bluetooth module; the battery management module BMS and 4G chip integration are realized, and the 4G chip is used to replace the MCU module in the BMS solution, which greatly saves costs; the 4G chip and BMS board are designed and integrated into a circuit board, which greatly reduces the space loss and manpower and material consumption caused by the design of two circuit boards.

[0060] Exemplary, reference Figure 5 and Figure 6The battery management system BMS six-in-one modular design system is equipped with a battery data management cloud platform. The six-in-one integrated system is used to collect the charging and discharging current of the battery pack, the total voltage of the battery pack, the voltage between each cell, the cell temperature and the battery movement information in real time, extract the working information of the charged battery, and collect the GPS location information of each battery; a new 4G chip is selected to replace the MCU module in the battery management system BMS, and a WIFI module is integrated. The collected data is transmitted to the cloud platform through the 4G module. At the same time, the lithium battery is managed and controlled, and the information is exchanged through the MCU module, 4G module and cloud platform in the lithium battery BMS board, and the status parameters of the lithium battery (the status parameters of the lithium battery refer to the voltage, remaining power and estimated standby endurance mileage.) and GPS location are transmitted via WIFI and Bluetooth to realize cloud storage of battery information and information interaction between the battery management system BMS and the mobile phone APP.

[0061] Exemplary, reference Figure 5 and Figure 6 The battery management system BMS six-in-one modular design system adds a three-axis accelerometer sensor, which combines acceleration and speed to obtain the battery status parameters to calculate the actual mileage of the vehicle or judge the battery's drop status; in order to overcome the GPS system's inaccurate mileage calculation and inaccurate spatial positioning, a GNSS module is added to achieve global search coverage.

[0062] Exemplary, reference Figure 5 and Figure 6 The above-mentioned embodiments can achieve data interaction, provide accurate customer services, and remotely solve customer problems in a modular battery management system. One has a lithium battery protection board with intelligent communication and data exchange, which is equipped with accurate voltage acquisition circuit, equalization circuit, temperature protection circuit, overcharge and overdischarge protection circuit, charger / load detection circuit, and communication circuit, etc.; the other has a 4G Bluetooth Internet of Things module integrated in the BMS board, which is equipped with WIFISCAN, GPS and GNSS positioning modules, Bluetooth modules, and cloud platform communication circuits.

[0063] Exemplary, reference Figure 5 and Figure 6, the alarm information of abnormal battery pack conditions is sent to the mobile terminal APP through the cloud platform, and the charging power supply can be remotely shut down and the discharge power supply can be shut down on the mobile terminal APP. The cloud platform concentrates the data of all battery packs in the charging process, driving process and static state of electric vehicles, and the data includes temperature, current, battery pack voltage, power, and single string voltage. The cloud platform can share data and display it on the mobile terminal APP. Secondly, the cloud platform locks the electric vehicle driving data through the mobile phone. Once the battery is abnormal or the electric vehicle fails, or the battery company or car company has a major product technological breakthrough, algorithm optimization, etc., the battery pack and the corresponding electric vehicle can be locked according to the cloud platform. The latest version of the product software can be sent from the cloud platform to solve the faults during customer use. Secondly, according to the factory-set parameters and mileage, after-sales service and store, fixed-point appointment service are provided. Improve the customer's intuitive experience of product use.

[0064] Exemplary, reference Figure 5 and Figure 6 The alarm information of abnormal battery pack conditions (equipment overspeed, electronic fence, high discharge temperature, low discharge temperature, high charge temperature, low charge temperature, full battery charge, battery overdischarge, charge overcurrent, discharge overcurrent, short circuit protection, illegal unloading, battery low voltage, equipment vibration) is sent to the mobile terminal APP through the cloud platform, and the mobile terminal APP can remotely operate the shutdown of the charging power supply and the shutdown of the discharging power supply.

[0065] Exemplary, reference Figure 5 and Figure 6 , the 4G chip integrates GNSS, GPS, WIFI, Bluetooth and cloud platform information interaction, communicates with the electric vehicle dashboard through the BMS communication module (RS485, one-line communication), and wirelessly uploads various information of the battery pack and the electric vehicle to the cloud platform. The 4G communication module can be used to locate the location of the battery pack by GPS, which can help to retrieve stolen electric vehicles. Effective intervention and correction can also be carried out based on the operating data. The analog front end is an analog front end based on the chip set DVC1018-2. The chip model in the 4G chip is preferably the chip EC800G-CN.

[0066] Among them, it needs to be explained that the above-mentioned AFE is the abbreviation of (Analog Front End) analog front end, which is used to collect information such as battery voltage, current, temperature, etc. The power supply part of the above-mentioned BMS board takes power from the highest node of the battery and converts it into low voltage to power the MCU module and the communication module. The above-mentioned communication module uses RS485 and one-line communication, which mainly communicates with the dashboard of the two-wheeled vehicle. The above-mentioned 4G chip communicates with the MCU and cloud platform of the BMS to wirelessly transmit battery information to the cloud platform. The above-mentioned GPS (Global Positioning System) global positioning module and GNSS (Global Navigation Satellite System) global navigation satellite system, including China's Beidou Satellite Navigation System (BDS), the United States' Global Positioning System (GPS), Russia's GLONASS Satellite Navigation System (GLONASS) and the European Union's Galileo Satellite Navigation System (GALILEO), are air-based radio navigation and positioning systems that can provide users with all-weather three-dimensional coordinates, speed and time information at any location on the surface of the earth or in near-Earth space. Obtain the precise positioning of the battery and upload the location to the cloud platform for information processing. The WIFISCAN module above scans WiFi signals to determine the approximate location of the battery for auxiliary positioning.

[0067] Compared with the related art, the solutions shown in some of the above embodiments of the present application have the following advantages:

[0068] (1) The battery management system (BMS) is a six-in-one modular design system that makes lithium battery replacement intelligent for two-wheeled and three-wheeled vehicles used by food delivery boys and couriers. It is a battery management system based on the Internet of Things.

[0069] (2) The battery management system (BMS) is a six-in-one modular design system, which uses the Internet and mobile Internet, cloud storage, and big data technologies to implement an Internet of Things management and control system, enabling timely emergency replacement, maintenance, and full-process tracking and control of shared lithium batteries for two-wheeled electric vehicles.

[0070] (3) Both the battery swap cabinet and the two-wheeled vehicle are equipped with lithium batteries, which are charged in a dedicated charging cabinet. The cloud platform controls the remaining power of the battery and transmits data on its specific location to each user’s APP, so that the number of batteries can be allocated according to the user’s actual needs to meet the user’s normal needs or emergency battery replacement needs.

[0071] (4) The integrated lithium battery provided is equipped with a meter for measuring the main performance parameters of the battery, such as voltage, remaining power, estimated standby mileage and the GPS location of the battery. Through the mobile Internet in the control system installed in the battery and the battery swap cabinet and battery swap vehicle, the above parameters of the battery are transmitted to the cloud platform system and the user's mobile phone. On the one hand, it provides reference for customer operations, and can also help enterprises remotely view the location and operating status of the battery. If an abnormality is found, early warning information can be issued to achieve predictive maintenance. The design of the GPS tracker and GNSS system has a relatively accurate positioning function. If a battery is lost, it can be located and retrieved in time.

[0072] (5) The battery management system based on the Internet of Things is equipped with a dedicated operating APP software for customers. Customers do not have to worry about not being able to find a battery swap station. The APP can locate and view the nearest battery swap station and automatically navigate to the nearest station.

[0073] In the various embodiments shown above, two voltage conversion branches and a first switch tube are provided in the power supply chip for the first reference voltage terminal connected to the power supply terminal of the communication processing chip. Both voltage conversion branches can convert the voltage inputted from the positive input terminal into a first reference voltage. The first switch tube can make one of the two conversion branches conductive with the first reference voltage terminal. Thus, when one of the voltage conversion branches cannot stably output the first reference voltage, the first switch tube switches to another voltage conversion branch to output the first reference voltage to the first reference voltage terminal, thereby ensuring stable power supply to the communication processing chip and increasing the stability of the system.

[0074] Furthermore, an embodiment of the present application also provides a battery system, which includes: a battery, and any one of the above-mentioned battery management systems, wherein the positive electrode of the battery is connected to the positive input terminal. The battery can be a variety of types of batteries. For example, the battery can be a power battery that provides driving force for the vehicle, or it can be an energy storage battery. There are many ways to set up the battery. Exemplarily, the battery can include a battery pack consisting of a plurality of battery cells connected in series or in parallel. The type of battery cell can be, for example, but not limited to, a blade battery cell, a cylindrical battery cell, and the like.

[0075] In addition, the embodiment of the present application further provides an energy storage device, which includes any of the above-mentioned battery systems. The energy storage device can be an electric vehicle such as, but not limited to, a two-wheeled electric bicycle, a three-wheeled electric vehicle, a four-way electric vehicle, etc., and the energy storage device can also be a power station equipment such as a battery swap station and a power station.

[0076] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A battery management system, characterized in that: include: A communication processing chip having a power supply terminal; A power chip, comprising a positive input terminal, a voltage conversion circuit and a first reference voltage terminal; wherein the positive input terminal is used to connect to the positive electrode of the battery, and the first reference voltage terminal is connected to the power supply terminal; The voltage conversion circuit includes: a first voltage conversion branch, a second voltage conversion branch and a first switch tube; each of the voltage conversion branches is connected to the positive input terminal and is used to convert the voltage input from the positive input terminal into a first reference voltage; the first switch tube is used to make one of the first voltage conversion branch and the second voltage conversion branch conductive with the first reference voltage terminal.

2. The battery management system according to claim 1, characterized in that: The first end of the first switch tube is connected to the output end of the first voltage conversion branch, the second end of the first switch tube is connected to the first reference voltage end, and the control end of the first switch tube is connected to the output end of the second voltage conversion branch; When the output end of the second voltage conversion branch outputs the first reference voltage, the first switch tube is turned off; when the output end of the second voltage conversion branch stops outputting the first reference voltage, the first switch tube is turned on.

3. The battery management system according to claim 1, characterized in that: The first voltage conversion branch comprises: a first Zener follower circuit, a second Zener follower circuit and a linear regulator connected in series in sequence; The input end of the first Zener follower circuit is connected to the positive input end, and the output end of the linear regulator is connected to the first reference voltage end through the first switch tube.

4. The battery management system according to claim 3, characterized in that: The power chip also has a second reference voltage terminal; Wherein, the output terminal of the first Zener follower circuit is also connected to the second reference voltage terminal, and is used to convert the voltage inputted from the positive input terminal into a second reference voltage; The second Zener follower circuit and the linear regulator are used to convert the second reference voltage into the first reference voltage.

5. The battery management system according to claim 1, characterized in that: The second voltage conversion branch includes: a first BUCK circuit, used to convert the voltage inputted from the positive input terminal into the first reference voltage; The input end of the first BUCK circuit is connected to the positive input end, and the output end of the BUCK circuit is connected to the first reference voltage end.

6. The battery management system according to claim 1, characterized in that: The power chip also includes: a second switch tube, wherein a first end of the second switch tube is connected to a ground end, a second end of the second switch tube is connected to the positive input end, and the second end of the second switch tube is also connected to the input ends of the first voltage conversion branch and the second voltage conversion branch; the communication processing chip is connected to the control end of the second switch tube, and is used to control the conduction and shutdown of the second switch tube; When the second switch tube is turned on, the first voltage conversion branch and the second voltage conversion branch stop working.

7. The battery management system according to any one of claims 1 to 6, characterized in that: The communication processing chip comprises: The power on / off signal input terminal is used to receive the power on / off signal; a third switch tube, wherein a first end of the third switch tube is connected to the switch signal input end, and a second end of the third switch tube is connected to the ground end; The delay circuit is connected between the power supply end and the control end of the third switch tube, and is used for delaying the turning on of the third switch tube when the power supply end inputs a switch signal to the switch signal input end.

8. The battery management system according to claim 7, characterized in that: The delay circuit comprises: a fourth switch tube, wherein a first end of the fourth switch tube is connected to the power supply end, and a second end of the fourth switch tube is connected to the control end of the third switch tube; The RC series circuit comprises a first resistor and a first capacitor connected in series; wherein the first resistor is connected between the first capacitor and the power supply end, and the first capacitor is connected between the ground end and the first resistor; A first diode and a second capacitor are connected in series, wherein the cathode of the first diode is connected to the power supply end, the anode of the first diode is connected to the first end of the second capacitor and the control end of the third switch tube, and the second end of the second capacitor is connected to the ground end.

9. The battery management system according to claim 8, characterized in that: The delay circuit also includes: An RC parallel circuit, wherein a first end of the RC parallel circuit is connected to the ground end, and a second end of the RC parallel circuit is connected between the second end of the fourth switch tube and the control end of the third switch tube.

10. The battery management system according to claim 1, characterized in that: The communication processing chip is a 4G chip or a 5G chip.

11. A battery system, characterized in that: include: A battery, and a battery management system according to any one of claims 1 to 10, wherein a positive electrode of the battery is connected to the positive electrode input terminal.

12. An energy storage device, characterized in that: Comprising the battery system as claimed in claim 11.

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