A new type of lead-acid lithium battery troubleshooting device and method

Abstract

The application discloses a novel lead-acid modified lithium battery fault troubleshooting device and method, characterized by comprising a lithium battery thermal management module, a lithium battery pack, a lithium battery power management module, a lithium battery external output and charging control module, a lithium battery fault information acquisition and display module, a lithium battery power-on control module, a lithium battery communication debugging interface and a lithium battery information display and fault reminding module; the lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output and charging control module and the lithium battery power management module; the lithium battery power management module is electrically connected with the lithium battery external output and charging control module, the lithium battery fault information acquisition and display module, the lithium battery power-on control module, the lithium battery communication debugging interface and the lithium battery information display and fault reminding module; and the lithium battery external output and charging control module is electrically connected with the lithium battery fault information acquisition and display module. The cause of the fault line can be directly analyzed, and the problem can be accurately located.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lithium batteries, and particularly relates to a novel lead-acid modified lithium battery fault troubleshooting device and method. BACKGROUND

[0002] Due to the long cycle life and light weight of the lithium battery system, more and more non-road vehicles use the lithium battery system, and various problems will inevitably occur in the research and development process, for example, power failure in the whole vehicle driving process and the like, and it is necessary to troubleshoot the faults to provide a solution for the power failure or other abnormal conditions in the power-on process. The traditional troubleshooting method is relatively cumbersome, the troubleshooting efficiency is low, it is not conducive to rapid diagnosis and maintenance of the lithium battery, and in the troubleshooting process, new faults may occur in other circuits in the battery circuit. SUMMARY

[0003] In order to make up for the shortcomings of the prior art, the application provides a novel lead-acid modified lithium battery fault troubleshooting device and method.

[0004] The novel lead-acid modified lithium battery fault troubleshooting device is characterized by comprising a lithium battery thermal management module, a lithium battery pack, a lithium battery power management module, a lithium battery external output and charging control module, a lithium battery fault information acquisition and display module, a lithium battery power-on control module, a lithium battery communication debugging interface and a lithium battery information display and fault reminding module. The lithium battery pack is electrically connected with the lithium battery thermal management module, the lithium battery external output and charging control module and the lithium battery power management module. The lithium battery power management module is electrically connected with the lithium battery external output and charging control module, the lithium battery fault information acquisition and display module, the lithium battery power-on control module, the lithium battery communication debugging interface and the lithium battery information display and fault reminding module. The lithium battery external output and charging control module is electrically connected with the lithium battery fault information acquisition and display module.

[0005] The novel lead-acid modified lithium battery fault troubleshooting device is characterized in that the lithium battery external output and charging control module comprises a pre-charging circuit, a charge-discharge relay K4, a discharge positive interface DC+ and a discharge negative interface DC-.

[0006] The novel lead-acid modified lithium battery fault troubleshooting device is characterized in that the pre-charging circuit comprises a pre-charging resistor R1 and a pre-charging relay K3.

[0007] The novel lead-acid modified lithium battery fault troubleshooting device is characterized in that the lithium battery power-on control module comprises a starting relay K1, a starting switch K7, a stopping switch K8 and a controllable voltage conversion power supply DCDC1.

[0008] The new lead-acid modified lithium battery troubleshooting device, characterized in that the lithium battery fault information acquisition and display module includes a plurality of acquisition channels, high-precision voltage acquisition equipment and an upper computer, the high-precision voltage acquisition equipment is connected with the upper computer through coaxial data transmission, and the acquisition channel is connected to the high-precision voltage acquisition equipment.

[0009] The new lead-acid modified lithium battery troubleshooting device, characterized in that the lithium battery information display and fault reminding module includes a display screen, an audible and visual buzzer and a communication display.

[0010] The new lead-acid modified lithium battery troubleshooting device, characterized in that the lithium battery communication debugging interface includes a whole vehicle debugging interface and an internal network debugging interface.

[0011] The new lead-acid modified lithium battery troubleshooting device, characterized in that the lithium battery thermal management module includes a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.

[0012] The new lead-acid modified lithium battery troubleshooting device, characterized in that the lithium battery power management module includes a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.

[0013] A new lead-acid modified lithium battery troubleshooting method, characterized in that

[0014] A high-precision voltage acquisition equipment is used to acquire the voltages of points A, B, C, D, E, F, G and H, and the voltages between points AB, CD, EF and CH are acquired and recorded, respectively. The acquisition period of the acquisition equipment can reach a microsecond level, which is less than the crystal vibration period of the BMS operation.

[0015] The voltage between the two points AB is the driving end voltage of the starting relay K1, the voltage between the two points CD is the voltage of the load end of the starting relay, the voltage between the two points EF is the driving end voltage of the discharge relay K4, and the voltage between the two points GH is the load end voltage of the discharge relay.

[0016] Uab and Uef are the relay driving voltages generated by the BMS after driving the internal switch through internal communication, which are generally 12V or 24V. During operation, K1 is in a closed state, so the voltage at point D is the same as the positive voltage of the battery, and Ucd is the total voltage at the battery end. In addition, K4 is in a closed state, so the voltage at point H is the same as the positive voltage of the battery, and Uch is the total voltage at the battery end.

[0017] If a fault occurs during operation, the fault point can be determined according to the corresponding displayed voltage.

[0018] If other voltages are normal, and the voltage between Uch disappears first, the fault is caused by mechanical failure of the discharge relay K4 due to vibration or the like;

[0019] If the voltage of Ucd becomes 0 first, and then the voltage of Uch becomes 0, it is caused by mechanical failure of the K1 starting relay due to vibration or the like;

[0020] If the voltage of Uab disappears first, and then the voltages of Ucd and Uch disappear, the power-off reason is caused by the BMS closing output or the wiring harness hardware, and since the wiring harness has high reliability, it can be analyzed that the fault is caused by the BMS driving.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The high-precision acquisition and recording device is used to troubleshoot, increase the accuracy of data, and increase the possibility of problem positioning;

[0023] 2. The coil and load end voltages of the low-voltage power supply relay and the main relay are directly positioned by time to increase the possibility of positioning problems;

[0024] 3. Some power-off problems caused by relay driving are provided for reference, and only need to arrange the sampling points at the corresponding working principle positions, thereby increasing the means of solving problems;

[0025] 4. The data is stored to increase the convenience of problem analysis;

[0026] 5. The coaxial data transmission between the acquisition device and the upper computer is selected to increase the accuracy of data;

[0027] 6. Each voltage point is led out of the box through the wiring harness hardware and connected to the high-precision acquisition device, thereby increasing the convenience of device acquisition;

[0028] 7. The data of each external device, such as a display screen, is analyzed to provide the possibility of analyzing problems;

[0029] 8. When the sampling lines are led out, each sampling line is insulated and protected to avoid short circuit and other faults, thereby increasing the safety of the system. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 It is a schematic diagram of connection of each module in the present application;

[0031] Fig. 2 It is a circuit principle diagram of the device of the present application;

[0032] Fig. 3 It is a principle schematic diagram of the lithium battery fault information acquisition and display module in the present application. DETAILED DESCRIPTION

[0033] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figs. 1-3 As shown, a novel lead-acid-to-lithium battery fault diagnosis device includes a lithium battery thermal management module 1, a lithium battery pack 2, a lithium battery power management module 3, a lithium battery external output and charging control module 4, a lithium battery fault information acquisition and display module 5, a lithium battery power-on control module 6, a lithium battery communication debugging interface 7, and a lithium battery information display and fault reminder module 8. The lithium battery pack is electrically connected to the lithium battery thermal management module, the lithium battery external output and charging control module, and the lithium battery power management module. The lithium battery power management module is electrically connected to the lithium battery external output and charging control module, the lithium battery fault information acquisition and display module, the lithium battery power-on control module, the lithium battery communication debugging interface, and the lithium battery information display and fault reminder module. The lithium battery external output and charging control module is electrically connected to the lithium battery fault information acquisition and display module.

[0036] The lithium battery output and charging control module includes a pre-charging circuit, a charging and discharging relay K4, a positive discharge interface DC+, and a negative discharge interface DC-.

[0037] The pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay K3.

[0038] The lithium battery power-on control module includes a start relay K1, a start switch K7, a stop switch K8, and a controllable voltage conversion power supply DCDC1.

[0039] The lithium battery fault information acquisition and display module includes several acquisition channels, a high-precision voltage acquisition device, and a host computer. The high-precision voltage acquisition device is connected to the host computer via coaxial data transmission, and the acquisition channels are connected to the high-precision voltage acquisition device. The high-precision voltage acquisition device is a high-precision oscilloscope.

[0040] The lithium battery information display and fault reminder module includes a display screen, an audio-visual buzzer, and a communication display.

[0041] The lithium battery communication debugging interface includes a vehicle debugging interface CANH / CANL, an internal network debugging interface CANH / CANL and a charging debugging CANH / CANL.

[0042] The lithium battery thermal management module includes a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.

[0043] The lithium battery power management module includes a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.

[0044] The lead-acid battery troubleshooting device is further described as follows: B1 and B2 are batteries, and currently, a module composed of 2 parallel and 25 series lithium iron phosphate battery groups is taken as an example, and the number and capacity can be increased or decreased; H1 and H2 are heating films, which are resistive loads, and heat can be generated by using the principle that the resistance of special materials can generate heat, so as to heat the module, so that the project can be applied to a wider temperature range; K2 and K5 are heating positive and negative relays, which are used to control the opening and closing of the heating film load; K4 is a charging and discharging relay, which is used to control the opening and closing of the battery output in discharging and the opening and closing of the charging branch in charging; K3 and R1 form a pre-charge branch, which protects the main relay during power-on discharging; K7 is a self-resetting start switch; K1 is a start relay, and the two switches are connected in parallel to jointly control the opening and closing of DC; K8 is a stop switch, after power-on is completed, the stop switch is turned off, the DC control end is de-energized, the BMS stops outputting, and when the lithium battery is started, DC / DC1 is a controllable backup power supply, which is used to supply power to the BMS, and the charging and discharging process is as follows.

[0045] Power-on discharging: DCDC1 is powered on by the self-resetting K7 switch, the all-in-one BMS is powered on, the BMS drive output pin closes the K1 start relay after the all-in-one machine is powered on, the self-resetting switch is opened, K1 remains closed, the all-in-one machine is powered on, the power supply is supplied to the BMS through the KEYON pin activated by the BMS, although it is a self-resetting switch, but the internal holding relay can keep the battery in the power-on state, it is noted that the K8 stop switch must be in the on state in order to power on, otherwise the input positive of DCDC1 has no power supply input, and power-on cannot be realized, when it wants to power off, K8 is turned off, K8 can be realized by a two-gear rotary switch, this method is an emergency solution, which is not often used according to user habits. The main power-off form is to continuously supply 5A, and automatically power off after 30 minutes, because the vehicle key and the battery key are separated, according to the habit of the lead-acid battery, the battery does not need to be turned off, so this function is often used, the display screen transmits the information of the battery to the display screen through 485 communication, and displays the current, capacity, single body, temperature and other information.

[0046] A new type of lead-acid modified lithium battery troubleshooting method, specifically, the BMS is the analysis and collection center of the whole battery, and the running period and processing capacity relationship If the vehicle power failure and other failures occur, the following methods can be used to troubleshoot, using high-precision voltage acquisition equipment, the voltage of points A, B, C, D, E, F, G, H shown in the figure is collected.

[0047] Collect and record the voltage between AB, CD, EF, CH points respectively, the collection period of the collection equipment can reach the microsecond level, which is less than the running crystal period of the BMS, the voltage between AB two points is the drive end voltage of the starting relay K1, the voltage between CD two points is the voltage of the starting relay load end, EF is the voltage of the discharge relay K4 drive end, GH is the voltage of the discharge relay load end, These four voltages have a certain relationship, Uab and Uef are the relay drive voltages generated after the BMS drives the internal switch through internal communication, generally 12V or 24V, K1 is in a closed state during operation, so the voltage at point D is the same as the positive voltage of the battery, so Ucd is the total voltage at the battery end, and due to the closing of K4, the voltage at point H is the same as the positive voltage of the battery, so Uch is the total voltage at the battery end, If a fault occurs during operation, there are many situations, if other voltages are normal, and the voltage between Uch disappears first, then the fault is caused by mechanical failure of the discharge relay K4 due to vibration and other reasons, if the voltage of Ucd becomes 0 first, and then the voltage of Uch becomes 0, it is caused by mechanical failure of the K1 starting relay due to vibration and other reasons, if Uab voltage disappears first, and then Ucd and Uch voltages disappear, then the power failure is caused by BMS output or wiring harness hardware, and due to the high reliability of the wiring harness, it can be analyzed that it is caused by the BMS drive.

[0048] Therefore, by this method, the cause of the fault can be directly analyzed, and whether it is affected by other external devices can be analyzed by checking the message data of other external devices, so that the problem can be accurately located.

[0049] The present application has the following advantages:

[0050] 1. The high-precision acquisition and recording equipment is used to troubleshoot, increase the accuracy of data, and increase the possibility of problem positioning.

[0051] 2. The coil and load end voltage of the low-voltage power supply relay and the main relay are collected and recorded, and the problem is located in time, which increases the possibility of problem positioning.

[0052] 3. This method provides a reference for some power failure problems caused by relay drive, which only needs to arrange the sampling points at the corresponding working principle position, and increases the means to solve the problem.

[0053] 4. Data is stored to increase the convenience of problem analysis.

[0054] 5. Coaxial data transmission is selected between the acquisition device and the host computer to increase data accuracy.

[0055] 6. Each voltage point is led out of the box through a wire harness hardware and connected to a high-precision acquisition device to increase the convenience of device acquisition.

[0056] 7. Analyzing the data of each external device, such as a display screen, provides the possibility of analyzing problems.

[0057] 8. When the sampling lines are led out, insulation protection is provided between each sampling line to avoid short circuiting and other faults, increasing system safety.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device, characterized in that, The fault diagnosis device includes a lithium battery thermal management module (1), a lithium battery pack (2), a lithium battery power management module (3), a lithium battery external output and charging control module (4), a lithium battery fault information acquisition and display module (5), a lithium battery power-on control module (6), a lithium battery communication debugging interface (7), and a lithium battery information display and fault reminder module (8). The lithium battery pack (2) is electrically connected to the lithium battery thermal management module (1), the lithium battery external output and charging control module (4), and the lithium battery power management module (3), respectively. The lithium battery power management module (3) is electrically connected to the lithium battery external output and charging control module (4), the lithium battery fault information acquisition and display module (5), the lithium battery power-on control module (6), the lithium battery communication debugging interface (7), and the lithium battery information display and fault reminder module (8), respectively. The lithium battery external output and charging control module (4) is electrically connected to the lithium battery fault information acquisition and display module (5). The lithium battery output and charging control module (4) includes a pre-charging circuit, a charging and discharging relay K4, a positive discharge interface DC+, and a negative discharge interface DC-; the lithium battery fault information acquisition and display module (5) includes several acquisition channels, a voltage acquisition device, and a host computer. The voltage acquisition device is connected to the host computer via coaxial data transmission, and the acquisition channels are connected to the voltage acquisition device; the lithium battery power-on control module (6) includes a start relay K1, a start switch K7, a stop switch K8, and a controllable voltage conversion power supply DCDC1; The troubleshooting method includes the following: Voltage acquisition equipment is used to acquire the voltages at points A, B, C, D, E, F, G, and H. The voltages between points AB, CD, EF, and CH are also acquired and recorded. The acquisition period of this equipment is on the order of microseconds, which is less than the crystal oscillator period of the BMS. The voltage between points A and B is the driving voltage of the starting relay K1, the voltage between points C and D is the load voltage of the starting relay, EF is the driving voltage of the charging and discharging relay K4, and CH is the load voltage of the charging and discharging relay K4. Uab and Uef are the driving voltages of the start relay K1 and charge / discharge relay K4 generated by the BMS through internal communication to drive the internal switch. They are 12V or 24V. During operation, the start relay K1 is in the closed state, so the voltage at point D is the same as the positive voltage of the battery. Therefore, Ucd is the total voltage at the battery terminal. Since the charge / discharge relay K4 is in the closed state, the voltage at point H is the same as the positive voltage of the battery. Therefore, Uch is the total voltage at the battery terminal. If a fault occurs during operation, the fault point can be determined based on the corresponding displayed voltage. If other voltages are normal, but the voltage between Uch disappears first, the fault is caused by the mechanical failure of the charge / discharge relay K4. If the voltage of Ucd first becomes 0, and then the voltage of Uch also becomes 0, it is due to the mechanical failure of the K1 starting relay. If the Uab voltage disappears first, followed by the Ucd and Uch voltages, the power outage is caused by a BMS driver failure or a wiring harness hardware failure.

2. The fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device according to claim 1, characterized in that, The pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay K3.

3. The fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device according to claim 1, characterized in that, The lithium battery information display and fault reminder module includes a display screen, an audio-visual buzzer, and a communication display.

4. The fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device according to claim 1, characterized in that, The lithium battery communication debugging interface includes a vehicle debugging interface and an intranet debugging interface.

5. The fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device according to claim 1, characterized in that, The lithium battery thermal management module includes a heating film H1, a heating film H2, a positive heating relay K2, and a negative heating relay K5.

6. The fault diagnosis method for a lead-acid-to-lithium battery fault diagnosis device according to claim 1, characterized in that, The lithium battery power management module includes a heating film H1, a heating film H2, a positive heating relay K2, and a negative heating relay K5.

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