Battery management system digital control quantity output method with diagnosis function

Abstract

The application discloses a battery management system digital control quantity output method with a diagnosis function, and belongs to the field of battery pipeline systems. The application has the following beneficial effects. One control pin of a relay is connected with a digital control quantity output by a battery management system master control, and the relay output digital control quantity is stabilized by an intelligent high-side power switch chip BTT6200-4ESA and a battery management system master control MCU chip, so that the method meets the stable control requirements of the battery system relay, and has the relay driving wire harness state diagnosis and battery management system digital control quantity output module diagnosis functions. Under the premise of meeting the basic control function of the battery management system on the relay, the relay component maintenance efficiency is improved, and the reliability of the battery system product is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of battery pipeline systems, and particularly relates to a digital control quantity output method of a battery management system with a diagnosis function. BACKGROUND

[0002] With the development of the energy storage field, lithium ion battery systems are widely used in the energy storage field, and the matching battery management systems also develop rapidly. The battery management system is more and more powerful, and the requirements are higher. In the battery management control in the prior art, because the input quantity cannot be stabilized, the stability of the relay control is poor. When the relay control is unstable, the state of the relay and the digital control quantity of the battery management system cannot be diagnosed, the relay cannot be maintained in time, and the reliability of the battery management system is reduced. SUMMARY

[0003] (I) Technical problem to be solved

[0004] In order to overcome the defects of the prior art, the present application provides a digital control quantity output method of a battery management system with a diagnosis function to solve the problem that in the battery management control in the prior art, because the input quantity cannot be stabilized, the stability of the relay control is poor, when the relay control is unstable, the state of the relay and the digital control quantity of the battery management system cannot be diagnosed, the relay cannot be maintained in time, and the reliability of the battery management system is reduced.

[0005] (II) Technical scheme

[0006] The application is implemented by the following technical scheme: the application provides a digital control quantity output method of a battery management system with a diagnosis function, which comprises the following steps:

[0007] Step 1: connect two control pins of a relay, one to a 24V negative pole and the other to a digital control quantity output by a battery management system main control, that is, a high-side driving pin;

[0008] Step 2: design a stable relay output digital control quantity;

[0009] First, connect the battery management system main control MCU chip to output the digital control quantity outside through the intelligent high-side power switch chip. The intelligent high-side power switch chip adopts a chip of the BTT6200 series switch, and the intelligent high-side power switch is a BTT6200-4ESA.

[0010] Secondly, the peripheral circuit of the intelligent high-side power switch chip is designed, and the high and low level signals are outputted to the outside combining with the digital output pin of the MCU, which is used to control the closing and opening of the relay. When the digital control quantity outputted by the battery management system is in high level state, that is, 24V positive is outputted, the relay control pin forms current at this time, thereby controlling the closing of the relay. When the digital control quantity outputted by the battery management system is in low level state, that is, 24V negative is outputted, the relay control pin cannot form current at this time, thereby controlling the opening of the relay.

[0011] Finally, the battery management system master MCU is set to output through the chip, and the PD6, PD12, MCU_HSD_IN2 and MCU_HSD_IN3 pins of the battery management system master MCU are connected to the IN0, IN1, IN2 and IN3 pins of the intelligent high-side power switch chip in sequence, respectively. The battery management system master MCU is set to output through the chip, and the output pins are OUT0, OUT1, OUT2 and OUT3, so that the output pins have 1A driving capability and are directly used for the control of the relay.

[0012] Step three: design the state diagnosis of the digital control quantity harness state and the digital quantity output module of the battery management system.

[0013] Firstly, the HSD_IS pin of the intelligent high-side power switch chip is connected to the current limiting resistor, the voltage stabilizing tube and the filter circuit, and then connected to the PF13 pin of the MCU, so that the battery management system master MCU can detect signals.

[0014] Secondly, the OUT0, OUT1 and OUT2 pins of the intelligent high-side power switch chip are connected to the filter circuit, the voltage stabilizing circuit and the triode, and then connected to the PD7, PD5 and PD10 pins of the MCU, respectively, so that the battery management system master MCU can control signals.

[0015] Finally, the PE10, PE8 and PC13 pins of the MCU chip are connected to the DEN, DSEL0 and DSEL1 pins of the intelligent high-side power switch chip through current limiting resistors, respectively, so that the battery management system master MCU can configure the intelligent high-side power switch chip.

[0016] Step four: set the diagnosis logic of the digital control quantity harness state and the digital quantity output module state of the battery management system as follows.

[0017] Firstly, the battery management system master MCU configures the DEN, DSEL1 and DSEL0 states, thereby controlling the output of each channel of the intelligent high-side power switch chip. ISThe order of the signals, the states of DEN, DSEL1 and DSEL0 are all 0, no detection output is performed; the states of DEN, DSEL1 and DSEL0 are 1, 0, 0, the No. 1 channel performs state detection and outputs I IS The order of the signals, the states of DEN, DSEL1 and DSEL0 are all 0, no detection output is performed; the states of DEN, DSEL1 and DSEL0 are 1, 0, 0, the No. 1 channel performs state detection and outputs I IS The order of the signals, the states of DEN, DSEL1 and DSEL0 are all 0, no detection output is performed; the states of DEN, DSEL1 and DSEL0 are 1, 0, 0, the No. 1 channel performs state detection and outputs I IS The order of the signals, the states of DEN, DSEL1 and DSEL0 are all 0, no detection output is performed; the states of DEN, DSEL1 and DSEL0 are 1, 0, 0, the No. 1 channel performs state detection and outputs I

[0018] Secondly, the battery management system master control MCU detects the state of each input of the intelligent high-side power switch chip before the high-level signal is obtained I IS , and detects the state of each input of the intelligent high-side power switch chip after the high-level signal is obtained I IS ;

[0019] Finally, the current chip mode is confirmed according to the input of the intelligent high-side power switch chip before the high-level signal output by the MCU is obtained, and the current chip mode is confirmed according to the input of the intelligent high-side power switch chip after the high-level signal output by the MCU is obtained, if the two modes are consistent, the mode state is output, if the two modes are inconsistent, the normal mode state is fixedly output, and each channel state is detected in turn according to a certain time period.

[0020] (Three) beneficial effects

[0021] One of the above technical solutions has the following advantages or beneficial effects:

[0022] To solve the problem that the existing technology cannot stabilize the input quantity in the battery management control, resulting in poor stability of the relay control, and at the same time, when the relay control is unstable, the relay state and the battery management system digital control quantity cannot be diagnosed, which is not convenient for timely maintenance of the relay, and reduces the reliability of the battery management system, the digital control quantity output by the battery management system master control is connected to one of the control pins of the relay, and the intelligent high-side power switch chip BTT6200-4ESA cooperates with the battery management system master control MCU chip to stabilize the digital control quantity output by the relay, so that the method meets the stable control requirements of the battery system relay, and has the functions of relay driving harness state diagnosis and battery management system digital control quantity output module diagnosis, and improves the relay component maintenance efficiency under the premise of meeting the basic control function of the battery management system to the relay, thereby improving the reliability of the battery system product;

[0023] The application can diagnose the digital control quantity harness state of the battery management system, the harness state including normal state, short circuit to 24V negative, short circuit to 24V positive and open circuit state, and can also diagnose the digital quantity output module state of the battery management system, the digital quantity output module state including normal state and over-temperature state, through diagnosing the harness state and the digital quantity module state, timely alarm is performed, and the stability of the battery system relay is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the following drawings:

[0025] Figure 1 A structural schematic diagram of a battery management system digital control quantity output method with a diagnosis function according to the application;

[0026] Figure 2 A structural schematic diagram according to the application; DETAILED DESCRIPTION

[0027] The application will be further described in detail below with reference to examples, but the embodiments of the application are not limited thereto.

[0028] The application provides a battery management system digital control quantity output method with a diagnosis function, including that a relay has two control pins, one connected to 24V negative and one connected to the digital control quantity output by the main control of the battery management system, i.e. a high-side driving pin;

[0029] I. Design a stable relay output digital control quantity scheme

[0030] A chip BTT6200-4ESA is selected to be used in cooperation with the main control MCU chip of the battery management system to output digital control quantity, the chip BTT6200-4ESA is an intelligent high-side power switch chip produced by Infineon, and a peripheral circuit is designed for the chip;

[0031] Reference Figure 1 , in cooperation with the MCU digital quantity output pin, high and low level signals are outputted to the outside, for controlling the closing and opening of the relay;

[0032] Reference Figure 2 and Figure 1 , Figure 2 The 5, 6, 141 and 28 pins of the main control MCU chip of the battery management system in the Figure 1The four inputs of the BTT6200-4ESA chip correspond to pins 2, 5, 9, and 10 of the BTT6200-4ESA chip, namely IN0, IN1, IN2, and IN3. The main control MCU of the battery management system outputs to the outside through the chip, with output pins 24, 20, 17, and 13, namely OUT0, OUT1, OUT2, and OUT3. The output pins have a 1A drive capability and can be directly used for relay control.

[0033] II. Design of digital control quantity harness status and digital output module status diagnosis for battery management system

[0034] refer to Figure 1 and Figure 2 ,from Figure 1 It is known that pin 7 of the BTT6200-4ESA chip is HSD_IS. This pin is connected to the current limiting resistor, Zener diode, and filter circuit before being connected to... Figure 2 Pin 122 of the MCU, also known as pin PF13 of the MCU, enables the main control MCU of the battery management system to perform signal detection;

[0035] refer to Figure 1 and Figure 2 ,from Figure 1 It can be seen that pins 24, 20, and 17 of the BTT6200-4ESA chip are digital control outputs, namely pins OUT0, OUT1, and OUT2 of the BTT6200-4ESA chip. These pins are then connected to the filter circuit, voltage regulator circuit, and transistor respectively. Figure 2 Pins 13, 16, and 18 of the MCU, namely PD7, PD5, and PD10, enable the main control MCU of the battery management system to perform signal control.

[0036] refer to Figure 1 and Figure 2 , Figure 2 Pins 7, 8, and 2 of the MCU chip, namely pins PE10, PE8, and PC13 of the MCU chip, are all connected via current-limiting resistors. Figure 1 Pins 6, 8, and 11 of the BTT6200-4ESA chip, namely the DEN, DSEL0, and DSEL1 pins of the BTT6200-4ESA chip, enable the main control MCU of the battery management system to configure the BTT6200-4ESA chip.

[0037] III. The design logic for the status diagnosis of the digital control quantity harness and digital output module of the battery management system is as follows:

[0038] The first step, the battery management system master MCU configures the DEN, DSEL1, DSEL0 state, thereby controlling the chip BTT6200-4ES each channel output I IS The order of the signals is as shown in Table 1 below: when the DEN, DSEL1, DSEL0 state is all 0, no detection output is performed; when the DEN, DSEL1, DSEL0 state is 1, 0, 0, the No. 1 channel performs state detection and outputs I IS signal; when the DEN, DSEL1, DSEL0 state is 1, 0, 1, the No. 2 channel performs state detection and outputs I IS signal; when the DEN, DSEL1, DSEL0 state is 1, 1, 0, the No. 3 channel performs state detection and outputs I IS signal;

[0039] Table 1: DEN, DSEL1, DSEL0 state matrix

[0040]

[0041] The second step, the battery management system master MCU respectively detects the chip BTT6200-4ESA each input I IS state before obtaining a high level signal, and then detects the chip BTT6200-4ESA each input I IS state after obtaining a high level signal from the MCU output, wherein the detection of the open circuit state requires the MCU_CH(n)_PU_ON pin of the MCU to control the transistor to pull up the output pin of the chip BTT6200-4ESA being detected.

[0042] The third step, first according to the chip BTT6200-4ESA input before obtaining the high level signal from the MCU output to confirm the current chip mode, and then according to the chip BTT6200-4ESA input after obtaining the high level signal from the MCU output to confirm the current chip mode, if the two modes are consistent, the mode state is outputted; if the two modes are inconsistent, the normal mode state is fixedly outputted;

[0043] For example, the first channel of the chip BTT6200-4ESA, the MCU configures to detect I IS(0) , then the MCU outputs a low level to the chip IN0, and the MCU detects I IS(0) , then according to the detection state value, the first channel current running mode is obtained as shown in Table 2 below; then the MCU outputs a high level to the chip IN0, and the MCU detects I IS(0) , then according to the detection state value, the first channel current running mode is obtained, if the two modes are the same, the current mode is outputted, if they are different, the normal mode is outputted; and according to a certain time period, each channel state is detected in turn;

[0044] Table 2: Channel mode matrix table

[0045]

[0046]

[0047] Wherein, Normal operation is normal state, Short circuit to GND is short circuit to 24V negative state, Overtemperature is chip module overtemperature state, Short circuit to VS is short circuit to 24V positive state, Open load is open circuit state; in each use condition, the criterion parameter value in the figure is different, for example, in 1A driving current condition, GND is 0V, V S is 24V, I IS(FAULT) is 6-35mA, V OL(OFF) is 20-22V, IL is driving load current, taking 1A; k ILIS takes 300, I IS(OL) takes 33uA, then the criterion is as shown in the following table 3.

[0048] Table 3: State criterion (1A driving current)

[0049]

[0050]

[0051] The stable digital control quantity for the relay is realized, the relay is closed and opened, one control pin of the relay is connected through the digital control quantity output by the battery management system master control, and the stable digital control quantity for the relay is output through the intelligent high-side power switch chip BTT6200-4ESA cooperating with the battery management system master control MCU chip, so that the method meets the stable control requirements of the battery system relay, and meanwhile has the relay driving wire harness state diagnosis and battery management system digital control quantity output module diagnosis functions, and under the premise of meeting the basic control function of the battery management system to the relay, the relay component maintenance efficiency is improved, so that the reliability of the battery system product is improved.

[0052] The application can diagnose the battery management system digital control quantity wire harness state, the wire harness state includes normal state, short circuit to 24V negative, short circuit to 24V positive and open circuit state, and can also diagnose the battery management system digital quantity output module state, the digital quantity output module state includes normal state and overtemperature state, through diagnosing the wire harness state and the digital quantity module state, timely alarm is carried out, and the stability of the battery system relay is improved

[0053] Example two

[0054] The embodiment uses analog circuit to diagnose the relay driving wire harness state and the digital control quantity output module state, has the advantages of the first embodiment, and has the disadvantages of high circuit product, poor stability and increased failure rate.

[0055] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A method for digital control quantity output of a battery management system with diagnostic function, characterized in that: Comprise the following steps: Step one: two control pins of the relay, one connects 24V negative, one connects the digital control quantity of the battery management system master output; Step two: design stable output digital control quantity of the relay; First, connect the battery management system master MCU chip through the intelligent high side power switch chip to output digital control quantity; Second, design the peripheral circuit of the intelligent high side power switch chip, combine the MCU digital output pin to output high and low level signal, which is used to control the closing and opening of the relay; Finally, set the battery management system master MCU chip PD6, PD12, MCU_HSD_IN2 and MCU_HSD_IN3 pins to IN0, IN1, IN2 and IN3 of the intelligent high side power switch chip respectively, and set the battery management system master MCU to output through the chip, which is directly used for the control of the relay; Step three: design the battery management system digital control quantity harness state and digital quantity output module state diagnosis; First, connect the current limiting resistor, voltage stabilizing tube and filter circuit to the MCU PF13 pin through the HSD_IS pin of the intelligent high side power switch chip, so that the battery management system master MCU can detect the signal; Second, connect the filter circuit, voltage stabilizing circuit and triode to the MCU PD7, PD5 and PD10 pins through the OUT0, OUT1 and OUT2 pins of the intelligent high side power switch chip, so that the battery management system master MCU can control the signal; Finally, connect the DEN, DSEL0 and DSEL1 pins of the intelligent high side power switch chip through the PE10, PE8 and PC13 pins of the MCU chip, so that the battery management system master MCU can configure the intelligent high side power switch chip; Step four: set the battery management system digital control quantity harness state and digital quantity output module state diagnosis logic as follows: First, the battery management system master MCU configures the DEN, DSEL1, DSEL0 state, so as to control the order of each channel output IIS signal of the intelligent high side power switch chip, DEN, DSEL1, DSEL0 state is all 0, then no detection output; DEN, DSEL1, DSEL0 state is 1, 0, 0, then 1 channel state detection, output IIS signal; DEN, DSEL1, DSEL0 state is 1, 0, 1, then 2 channel state detection, output IIS signal; DEN, DSEL1, DSEL0 state is 1, 1, 0, then 3 channel state detection, output IIS signal; Second, the battery management system master MCU detects the state of IIS before each input of the intelligent high side power switch chip gets high level signal, and then detects the state of IIS after each input of the intelligent high side power switch chip gets high level signal; Finally, according to the input of the intelligent high-side power switch chip, the current chip mode is confirmed before the MCU outputs a high level signal, and then the current chip mode is confirmed after the input of the intelligent high-side power switch chip obtains the high level signal output by the MCU, if the two modes are consistent, the mode state is output, if the two modes are inconsistent, the normal mode state is fixedly output, and each channel state is detected in turn according to a certain time period.

2. The method of claim 1, wherein: In step four, when detecting the open circuit state, the MCU_CH(n)_PU_ON pin of the MCU is required to control the transistor, so that the output pin of the intelligent high-side power switch chip of the detected channel is pulled high.

3. The method of claim 1, wherein: The intelligent high-side power switch chip adopts a chip of a BTT6200 series switch.

4. The method of claim 3, wherein: The intelligent high-side power switch is of a BTT6200-4ESA type.

5. The method of claim 1, wherein: The MCU adopts an STM32MP series.

6. The method of claim 5, wherein: The MCU is of an STM32MP15x type.

7. The method of claim 1, wherein: In step two, the battery management system master MCU has a 1A driving capability through the output pin output by the chip.

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