CN113401005A - Novel troubleshooting device and method for lead-acid-to-lithium battery - Google Patents

Novel troubleshooting device and method for lead-acid-to-lithium battery Download PDF

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Publication number
CN113401005A
CN113401005A CN202110584985.7A CN202110584985A CN113401005A CN 113401005 A CN113401005 A CN 113401005A CN 202110584985 A CN202110584985 A CN 202110584985A CN 113401005 A CN113401005 A CN 113401005A
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China
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lithium battery
voltage
lithium
relay
module
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CN202110584985.7A
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Chinese (zh)
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李晓侠
梁龙
许奇
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Hangzhou Pengcheng New Energy Technology Co ltd
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Hangzhou Pengcheng New Energy Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a novel device and a method for troubleshooting of a lead-acid-modified lithium battery, which are 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 and a lithium battery power-on control module, lithium cell communication debugging interface and lithium cell information display and trouble remind the module, lithium cell group respectively with lithium cell thermal management module, the external output of lithium cell and charging control module, lithium cell power management module electricity is connected, lithium cell power management module respectively with the external output of lithium cell and the control module that charges, lithium cell trouble information acquisition and display module, electric control module on the lithium cell, lithium cell communication debugging interface and lithium cell information display and trouble remind the module electricity to be connected, the lithium cell is connected with lithium cell trouble information acquisition and display module electricity to the external output and the control module that charges. The reason of the fault outgoing line can be directly analyzed, and the problem can be accurately positioned.

Description

Novel troubleshooting device and method for lead-acid-to-lithium battery
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a novel device and a method for troubleshooting of a lead-acid-modified lithium battery.
Background
Because the lithium battery system has the advantages of long cycle life, light weight and the like, the lithium battery system is used by more and more non-road vehicles, various problems can be avoided in the research and development process, for example, the faults need to be checked under the conditions of power failure and the like in the driving process of the whole vehicle, and a solution is provided for the power failure or other abnormal conditions in the power-on process. The traditional checking method is complex, low in checking efficiency, not beneficial to rapid diagnosis and maintenance of the lithium battery, and may cause new faults of other circuits in the battery circuit in the checking process.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a novel device and a method for troubleshooting of a lead-acid-modified lithium battery.
The novel troubleshooting device for the lead-acid-to-lithium battery 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 respectively and electrically connected with the lithium battery thermal management module, the lithium battery external output and charging control module and the lithium battery power supply management module, the lithium battery power supply management module is respectively and 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.
The novel troubleshooting device for the lead-acid-to-lithium battery is characterized in that the lithium battery external output and charging control module comprises a pre-charging circuit, a charging and discharging relay K4, a discharging positive interface DC + and a discharging negative interface DC-.
The novel troubleshooting device for the lead-acid-to-lithium battery is characterized in that the pre-charging circuit comprises a pre-charging resistor R1 and a pre-charging relay K3.
The novel troubleshooting device for changing lead acid into lithium batteries is characterized in that the lithium battery charging control module comprises a starting relay K1, a starting switch K7, a stopping switch K8 and a controllable voltage conversion power supply DCDC 1.
Novel lead acid change lithium cell troubleshooting device, its characterized in that lithium cell trouble information acquisition and display module include a plurality of collection passageways, high accuracy voltage acquisition equipment and host computer high accuracy voltage acquisition equipment through coaxial data transmission with host computer signal connection, the collection passageway is connected on the high accuracy voltage acquisition equipment.
Novel lead acid change lithium cell troubleshooting device, its characterized in that lithium cell information display and trouble prompt module include display screen, reputation bee calling organ and communication display.
Novel lead acid change lithium cell troubleshooting device, its characterized in that lithium cell communication debugging interface includes whole car debugging interface and intranet debugging interface.
The novel troubleshooting device for the lead-acid-to-lithium battery is characterized in that the lithium battery thermal management module comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
The novel troubleshooting device for the lead-acid-to-lithium battery is characterized in that the lithium battery power supply management module comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
A novel troubleshooting method for changing lead acid into lithium batteries is characterized in that
Collecting the voltages of points A, B, C, D, E, F, G and H by using high-precision voltage collecting equipment, and respectively collecting and recording the voltages among the points AB, CD, EF and CH, wherein the collecting period of the collecting equipment can reach microsecond level and is less than the crystal oscillator period of the BMS in operation;
the voltage between the two points AB is the voltage of the driving end of the starting relay K1, the voltage of the two ends of the CD is the voltage of the load end of the starting relay, EF is the voltage of the driving end of the discharging relay K4, and GH is the voltage of the load end of the discharging relay;
uab and Uef are relay driving voltage generated after the BMS drives the internal switch through internal communication, generally 12V or 24V, and K1 is in a closed state during operation, so voltage at a point D is the same as positive voltage of the battery, so Ucd is total voltage high at the battery terminal, and since K4 is in a closed state, voltage at a point H is the same as positive voltage of the battery, Uch is total voltage at the battery terminal;
if a fault occurs in the operation process, judging a fault point according to the correspondingly displayed voltage;
if other voltages are normal and the voltage between Uch disappears firstly, the fault is caused by mechanical failure of the discharge relay K4 due to vibration and the like;
if the voltage of Ucd becomes 0 first, then the voltage of Uch becomes 0 again, it is caused by mechanical failure of K1 start relay due to vibration and the like;
if it is that Uab voltage disappears earlier, Ucd, Uch voltage disappears, then the reason of falling the power supply is closed output or pencil hardware by the BMS and is caused, because the pencil reliability is higher again, can separate out it and cause the trouble because of BMS driven reason.
Compared with the prior art, the invention has the following advantages:
1. the high-precision acquisition and recording equipment is used for troubleshooting, so that the data accuracy is increased, and the possibility of problem positioning is increased;
2. the possibility of positioning problems is increased by collecting the sequential positioning problem of the direct time of the coil and load end voltages of the low-voltage power supply relay and the main relay;
3. the method provides reference for problems such as power failure caused by relay driving, and only needs to arrange sampling points at the positions of corresponding working principles, so that problem solving means are added;
4. the data are stored, so that the problem analysis convenience is improved;
5. coaxial data transmission is selected between the acquisition equipment and the upper computer, so that the data accuracy is improved;
6. each voltage point is led out of the box through the wire harness hardware and connected to high-precision acquisition equipment, so that the acquisition convenience of the equipment is improved;
7. analyzing data of each external device, such as a display screen and the like, and providing possibility for analyzing problems;
8. when the sampling lines are led out, insulation protection is performed among the sampling lines, so that other faults caused by short circuit of the outgoing lines are avoided, and the safety of the system is improved.
Drawings
FIG. 1 is a schematic diagram of the connection of modules in the present invention;
FIG. 2 is a schematic circuit diagram of the apparatus of the present invention;
fig. 3 is a schematic diagram of a lithium battery fault information acquisition and display module according to the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The invention will be further explained with reference to the drawings.
As shown in fig. 1-3, a novel troubleshooting device for changing lead-acid into lithium battery comprises 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 charging control module 6, a lithium battery communication debugging interface 7 and a lithium battery information display and fault reminding module 8, wherein 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 respectively, 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 charging control module, the lithium battery communication debugging interface and the lithium battery information display and fault reminding module respectively, and the lithium battery external output and charging control module is electrically connected with the lithium battery fault information acquisition and display module And (6) connecting.
The lithium battery external output and charging control module comprises a pre-charging circuit, a charging and discharging relay K4, a discharging positive interface DC + and a discharging negative interface DC-.
The pre-charging circuit comprises a pre-charging resistor R1 and a pre-charging relay K3.
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 DCDC 1.
Lithium cell fault information gathers and display module includes a plurality of collection passageways, high accuracy voltage acquisition equipment and host computer high accuracy voltage acquisition equipment through coaxial data transmission with host computer signal connection, gather the access connection and be in on the high accuracy voltage acquisition equipment. The high-precision voltage acquisition equipment is a high-precision oscilloscope.
The lithium battery information display and fault reminding module comprises a display screen, an acousto-optic buzzer and a communication display.
The lithium battery communication debugging interface comprises a whole vehicle debugging interface CANH/CANL, an internal network debugging interface CANH/CANL and a charging debugging interface CANH/CANL.
The lithium battery thermal management module comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
The lithium battery power supply management module comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
The invention further discloses a lead-acid battery troubleshooting device, wherein B1 and B2 are batteries, a module group formed by 2 parallel 25 series batteries of lithium iron phosphate is taken as an example at present, the number and the capacity can be increased or reduced, H1 and H2 are heating films which are resistive loads, heat can be generated by applying the principle that a resistor made of special materials can generate heat and used for heating the module group, so that the project can be suitable for a wider temperature range, K2.K5 is a heating positive relay and a heating negative relay and used for controlling the on and off of the heating film load, K4 is a charge and discharge relay, is used for controlling the on and off of the external output of the battery during discharging, is used for controlling the on and off of a charging branch during charging, K3 and R1 form a pre-charging branch circuit, correspondingly protects a main relay during discharging and electrifying, K7 is a self-resetting starting switch, K1 is a starting relay, and two switches are connected in parallel to control the on and off of DC, k8 is a stop switch, and after the power-on is completed, the switch is turned off to enable the commercial power of the DC control end, the BMS stops outputting, when the lithium battery is turned on, the DC/DC1 is a controllable standby power supply for supplying power to the BMS, and the charging and discharging processes are as follows.
Discharging and electrifying: the method comprises the steps that DCDC1 is controlled to be electrified by clicking a self-reset switch K7 to supply power to the all-in-one machine BMS, after the all-in-one machine supplies power, a BMS drives an output pin to close a K1 starting relay, after the self-reset switch is disconnected, a K1 is kept closed to keep supplying power to the all-in-one machine, the power is supplied to the BMS through a KEYON pin activated by the BMS, although the all-in-one machine BMS is a self-reset switch, an internal holding relay can keep a battery in an electrified state, it is noted that the stopping switch of the K8 needs to be in a conducting state when power is needed to be electrified, otherwise, the input of the DCDC1 has no power input, electrification cannot be realized, when the battery needs to be electrified, the K8 is turned off, the K8 can be realized through a two-gear knob switch, the method is an emergency scheme, and is not used frequently according to the habit of users. The main form of cutting off the electricity is for lasting 5A, and the automatic point of cutting off after 30MIN because whole car key separates with the battery key, need not turn off the battery according to lead acid battery's custom, so this function frequently uses, and the display screen passes through the 485 communication with the information biography of battery to the display screen in, information such as display current, electric quantity, monomer, temperature.
A novel fault troubleshooting method for a lead-acid-to-lithium battery is characterized in that a BMS is used as an analysis, acquisition and calculation center of a whole battery, if faults such as power failure of a whole vehicle occur in relation of operation period and processing capacity of the BMS, the faults can be debugged through the following method, and high-precision voltage acquisition equipment is used for acquiring voltages of points A, B, C, D, E, F, G and H of a graph.
Respectively collecting and recording voltages between points AB, CD, EF and CH, wherein the collecting period can reach microsecond level and is less than the crystal oscillation period of BMS operation, the voltage between the points AB is the voltage at the driving end of a starting relay K1, the voltage at two ends of CD is the voltage at the load end of the starting relay, EF is the voltage at the driving end of a discharging relay K4, GH is the voltage at the load end of the discharging relay, the four voltages have a certain relation, Uab and Uef are the relay driving voltage generated after the BMS drives an internal switch through internal communication, generally 12V or 24V, when in operation, K1 is in a closed state, so the voltage at a point D is the same as the positive voltage of a battery, so Ucd is the total voltage high voltage of the battery end, and because K4 is in the closed state, the voltage at the point H is the same as the positive voltage of the battery, Uch is the total voltage of the battery end, and if faults occur in the operation process, various conditions exist, if other voltages are normal and the voltage between Uch disappears firstly, the fault is caused by mechanical failure of the discharging relay K4 due to vibration and the like, if the voltage of Ucd becomes 0 firstly and then the voltage of Uch becomes 0 again, the fault is caused by mechanical failure of the K1 starting relay due to vibration and the like, if the voltage of Uab disappears firstly and then Ucd, the voltage of Uch disappears, the power failure reason is caused by BMS closed output or harness hardware, and the harness reliability is higher, so that the fault can be analyzed to be caused by BMS driving reasons.
Therefore, the method can directly analyze the reason of the fault outgoing line, and can check whether the message data of other external devices are influenced by the data of other external equipment or not, so that the problem can be accurately positioned.
The invention has the following advantages:
1. the high-precision acquisition and recording equipment is used for troubleshooting, data accuracy is increased, and probability of problem positioning is increased.
2. The possibility of positioning problems is increased by collecting the sequence of direct time use of the coil and load end voltages of the low-voltage power supply relay and the main relay.
3. The method provides reference for problems such as power failure caused by relay driving, and only needs to arrange sampling points at positions of corresponding working principles, so that problem solving means are added.
4. And the data is stored, so that the problem analysis convenience is improved.
5. Coaxial data transmission is selected between the acquisition equipment and the upper computer, and data accuracy is improved.
6. Each voltage point is led out outside the box through the wire harness hardware and is connected to high-precision acquisition equipment, so that the acquisition convenience of the equipment is improved.
7. And analyzing data of each external device, such as a display screen and the like, so as to provide possibility for analyzing problems.
8. When the sampling lines are led out, insulation protection is performed among the sampling lines, so that other faults caused by short circuit of the outgoing lines are avoided, and the safety of the system is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A novel troubleshooting device for changing lead acid into lithium batteries 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 respectively and electrically connected with the lithium battery thermal management module, the lithium battery external output and charging control module and the lithium battery power supply management module, the lithium battery power supply management module is respectively and 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.
2. The novel troubleshooting device for the lead-acid-modified lithium battery as claimed in claim 1, wherein the external output and charging control module of the lithium battery comprises a pre-charging circuit, a charging and discharging relay K4, a discharging positive interface DC + and a discharging negative interface DC-.
3. The novel troubleshooting device for lead-acid-modified lithium batteries of claim 2, characterized in that said pre-charging circuit comprises a pre-charging resistor R1 and a pre-charging relay K3.
4. The novel device for troubleshooting of lithium ion batteries modified by lead-acid according to claim 1, characterized in that the power-on control module of lithium ion batteries comprises a starting relay K1, a starting switch K7, a stopping switch K8 and a controllable voltage conversion power source DCDC 1.
5. The novel device for troubleshooting of lithium ion batteries modified by lead-acid according to claim 1, wherein the lithium ion battery failure information acquisition and display module comprises a plurality of acquisition channels, a high-precision voltage acquisition device and an upper computer, the high-precision voltage acquisition device is in signal connection with the upper computer through coaxial data transmission, and the acquisition channels are connected to the high-precision voltage acquisition device.
6. The novel troubleshooting device for lead-acid-to-lithium batteries as claimed in claim 1, characterized in that said lithium battery information display and failure prompt module comprises a display screen, an acousto-optic buzzer and a communication display.
7. The novel troubleshooting device for the lead-acid-to-lithium battery of claim 1, wherein the communication debugging interface of the lithium battery comprises a vehicle debugging interface and an internal network debugging interface.
8. The novel device for troubleshooting of lithium ion batteries modified by lead-acid according to claim 1, characterized in that the thermal management module of lithium batteries comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
9. The novel device for troubleshooting of lithium ion batteries modified by lead-acid according to claim 1, characterized in that the power management module of lithium batteries comprises a heating film H1, a heating film H2, a heating positive relay K2 and a heating negative relay K5.
10. A novel method for troubleshooting a lead-acid modified lithium battery as defined in any one of claims 1 to 9 wherein
Collecting the voltages of points A, B, C, D, E, F, G and H by using high-precision voltage collecting equipment, and respectively collecting and recording the voltages among the points AB, CD, EF and CH, wherein the collecting period of the collecting equipment can reach microsecond level and is less than the crystal oscillator period of the BMS in operation;
the voltage between the two points AB is the voltage of the driving end of the starting relay K1, the voltage of the two ends of the CD is the voltage of the load end of the starting relay, EF is the voltage of the driving end of the discharging relay K4, and GH is the voltage of the load end of the discharging relay;
uab and Uef are relay driving voltage generated after the BMS drives the internal switch through internal communication, generally 12V or 24V, and K1 is in a closed state during operation, so voltage at a point D is the same as positive voltage of the battery, so Ucd is total voltage high at the battery terminal, and since K4 is in a closed state, voltage at a point H is the same as positive voltage of the battery, Uch is total voltage at the battery terminal;
if a fault occurs in the operation process, judging a fault point according to the correspondingly displayed voltage;
if other voltages are normal and the voltage between Uch disappears firstly, the fault is caused by mechanical failure of the discharge relay K4 due to vibration and the like;
if the voltage of Ucd becomes 0 first, then the voltage of Uch becomes 0 again, it is caused by mechanical failure of K1 start relay due to vibration and the like;
if it is that Uab voltage disappears earlier, Ucd, Uch voltage disappears, then the reason of falling the power supply is closed output or pencil hardware by the BMS and is caused, because the pencil reliability is higher again, can separate out it and cause the trouble because of BMS driven reason.
CN202110584985.7A 2021-05-27 2021-05-27 Novel troubleshooting device and method for lead-acid-to-lithium battery Pending CN113401005A (en)

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Application Number Priority Date Filing Date Title
CN202110584985.7A CN113401005A (en) 2021-05-27 2021-05-27 Novel troubleshooting device and method for lead-acid-to-lithium battery

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CN113401005A true CN113401005A (en) 2021-09-17

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