A lithium battery integrated system replacing a lead-acid battery and a control method thereof

Abstract

The application discloses a lithium battery integrated system for replacing lead-acid batteries, which comprises a lithium battery module, a battery management system connected to the lithium battery module, a special charger, a vehicle controller, a power correction module connected to the vehicle controller and a vehicle instrument, and a smart detector connected to the lithium battery module, wherein the battery management system is provided with a charger identification module which can identify the special charger and a non-matching charger during charging. The lithium battery module and the special charger are matched through a charging and discharging loop communication method, the safe use of the battery module during charging is ensured, and the power correction module is added for matching the electric vehicle, so that the accurate power display of the original instrument can be realized without damaging the vehicle instrument and circuit, the unsafe wire harness modification is eliminated, and the running safety after the lead-acid batteries are replaced by the lithium batteries is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and in particular relates to a lithium battery integration system for replacing lead-acid batteries and a control method thereof. BACKGROUND

[0002] Lead-acid batteries are widely used as power energy for power demand ends (such as electric bicycles, electric light motorcycles, electric motorcycles, electric forklifts, AGVs, etc.) due to mature development technology, stable performance, and high safety. However, improper handling during the production process or after disposal of lead-acid batteries can easily pollute the environment, and it has become a mainstream to replace lead-acid batteries with lithium batteries with higher energy density and no pollution after the existing lead-acid batteries of power demand ends reach the service life.

[0003] However, the traditional replacement method mostly needs to substantially modify multiple electric vehicles, such as replacing the whole-vehicle circuit wire connector due to the inconsistency between the lithium battery product interface and the lead-acid battery, externally connecting a display instrument or replacing the vehicle instrument due to the inability of the original battery instrument to correctly display the power, the construction process is complicated, the safety performance of the whole vehicle is reduced, and there is a serious safety hazard of misusing a lead-acid battery charger to charge a lithium battery. These are problems that need to be solved urgently when replacing lead-acid batteries with lithium batteries. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to provide a lithium battery integration system for replacing lead-acid batteries and a control method thereof, so as to avoid the troubles of poor performance and safety hazards of the previous lead-acid batteries.

[0005] In order to solve the above technical problems, the present application discloses a lithium battery integration system for replacing lead-acid batteries, which comprises:

[0006] a lithium battery module, the lithium battery module comprising a lithium battery pack and a battery management system, the lithium battery pack having lithium battery strings connected in series or in parallel inside; the battery management system being connected to the lithium battery pack;

[0007] a special charger, the special charger being powered for the lithium battery module;

[0008] a whole-vehicle controller, the whole-vehicle controller being connected to the lithium battery module;

[0009] a power correction module, the power correction module being connected to the whole-vehicle controller and a vehicle instrument; and

[0010] an intelligent detection instrument connected to the lithium battery module;

[0011] The battery management system has a charger identification module, which can identify the special charger and the non-matching charger during charging.

[0012] According to an embodiment of the present application, the special charger has a charging and discharging line communication module for matching with the charger identification module of the battery management system.

[0013] According to an embodiment of the present application, the battery management system can increase a storage unit or an independent communication interface, record daily use data in the storage unit, and transmit or update system software externally through the independent communication interface when necessary.

[0014] A control method of a lithium battery integrated system for replacing a lead-acid battery, comprising:

[0015] Step 1: integrating the lithium battery pack and the battery management system according to the capacity and voltage range;

[0016] Step 2: obtaining the nonlinear electrical characteristics of the open-circuit voltage and the remaining capacity SOC of the lead-acid battery type, and the equivalent circuit parameter model, and storing them into the system;

[0017] Step 3: judging the system state, if the system is stopped, stopping the output and entering the low-power storage mode according to the predetermined control strategy, ending the control process, if the system is normally running, executing Step 4;

[0018] Step 4: judging whether the system can complete the communication handshake, if yes, executing Step 4-1, otherwise, executing Step 5;

[0019] Step 4-1: sending the battery SOC condition, historical operation data and other key information to the intelligent detector, and receiving the detection strategy issued by the intelligent detector, and cooperating to complete the battery detection or maintenance action as needed;

[0020] Step 4-2: determining the health state of the battery pack according to the detection data by the intelligent detector, if the determination is healthy, continuing to Step 1, if the determination is abnormal, locking the battery charging and discharging function and ending the control;

[0021] Step 5: judging whether the system is connected to a charging device, if yes, executing Step 5-1, otherwise, executing Step 6;

[0022] Step 5-1: reading the identification information sent by the charger and comparing it with the preset information, judging whether it is a special charger, if yes, executing Step 5-2, otherwise, executing Step 5-3; Step 5-2: the battery management system opens the charging MOSFET, executes the charging function, and is responsible for executing the related charging protection strategy, after the charging is completed, the battery management system determines the health state of the battery pack, if the determination is healthy, continuing to Step 1, if the determination is abnormal, locking the battery charging and discharging function and ending the control;

[0023] Step 5-3: the battery management system continuously closes the MOSFET, performs the charging function, and is responsible for performing the related protection strategy, while continuously monitoring the health of the battery pack and the battery management system, if it is determined to be healthy, it continues to step 1, if it is determined to be abnormal, it locks the battery pack charging and discharging function and ends the control;

[0024] Step 6: normally execute the protection strategy and run by the battery management system, while monitoring whether the standby time is overdue, if so, execute step 7, otherwise execute step 6-1;

[0025] Step 6-1: read the battery state by the power correction module, calculate the matched lead-acid battery voltage, output the simulated lead-acid battery voltage to the vehicle instrument, and the battery management system is responsible for executing the related protection strategy, while continuously monitoring the health of the battery pack and the battery management system, if it is determined to be healthy, it continues to step 1, if it is determined to be abnormal, it locks the battery pack charging and discharging function and ends the control;

[0026] Step 7: execute the storage mode control strategy by the battery management system.

[0027] Compared with the prior art, the present application can obtain the following technical effects:

[0028] The present application realizes the matching of the lithium battery pack and the special charger through the charging and discharging circuit communication method, ensures the safe use of the battery pack charging process, and at the same time adds a power correction module for the matching of the electric vehicle, which can realize the accurate power display of the original instrument without damaging the vehicle instrument and circuit, eliminates the unsafe wire harness modification, and improves the running safety after replacing the lead-acid battery with the lithium battery.

[0029] Of course, any product implementing the present application does not necessarily need to achieve all the technical effects described above. DETAILED DESCRIPTION

[0030] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0031] Figure 1 A lithium battery integrated system framework for replacing a lead-acid battery provided by the embodiment of the present application is shown;

[0032] Figure 2 A control flowchart of a control method for replacing a lead-acid battery provided by the embodiment of the present application is shown.

[0033] REFERENCE NUMERALS

[0034] Vehicle instrument 1, electric quantity correction module 2, vehicle controller 3, lithium battery pack 4, battery management system 5, special charger 6, intelligent detector 7. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail with reference to the drawings and examples, so that the realization process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0036] Please refer to Figure 1 , Figure 1 The figure shows the lithium battery integrated system framework for replacing lead-acid battery provided by the embodiment of the present application.

[0037] As shown in the figure, a lithium battery integrated system for replacing lead-acid battery comprises: a lithium battery module, the lithium battery module comprising a lithium battery pack 4 and a battery management system 5, the lithium battery pack 4 having lithium battery strings connected in series or in parallel inside; the battery management system 5 connected to the lithium battery pack 4; a special charger 6, the special charger 6 providing power for the lithium battery module; a vehicle controller 3, the vehicle controller 3 connected to the lithium battery module; an electric quantity correction module 2, the electric quantity correction module 2 connected to the vehicle controller 3 and a vehicle instrument 1; and an intelligent detector 7 connected to the lithium battery module; wherein the battery management system 5 has a charger identification module, the charger identification module being able to identify the special charger 6 and a non-matching charger when charging.

[0038] In an embodiment of the present application, the lithium battery pack 4 obtains the same voltage and required battery capacity as the lead-acid battery pack to be replaced by connecting the lithium battery strings in parallel inside, so as to provide power for an electric vehicle.

[0039] The battery management system 5 is responsible for collecting real-time information such as voltage and current of the lithium battery pack 4, implementing necessary protection for the whole process of charging and discharging of the lithium battery pack 4, and having a special charger identification module to protect the battery pack from being charged by a non-matching charger.

[0040] The special charger 6 is responsible for charging the lithium battery pack 4 and has a charging and discharging line communication function for matching with the battery management system 5.

[0041] The electric quantity correction module 2 is responsible for simulating the discharge characteristics of the lithium battery pack 4 into similar characteristics of lead-acid battery to ensure that the lead-acid battery electric quantity calculation instrument can accurately reflect the state of the lithium battery pack, and is used for connecting in the circuit between the vehicle controller 3 and the vehicle instrument 1.

[0042] The intelligent detector 7 is responsible for periodic or non-periodic detection and maintenance of the battery system, and has the ability of battery system state detection and analysis.

[0043] The special charger 6 has a charge-discharge circuit communication module, which is used to match the charger identification module of the battery management system 5, and can open the charging MOS after receiving the matching signal of the special charger 6, and real-time acquisition of lithium battery pack parameter information is provided to the central processing unit according to the corresponding management strategy to manage the charge-discharge process of the lithium battery pack 4.

[0044] The battery management system 5 can increase the storage unit or independent communication interface, record the daily use data in the storage unit, and transmit or update the system software through the independent communication interface when necessary.

[0045] Next, please continue to refer to Figure 2 The application also provides a control method of a lithium battery integrated system replacing a lead-acid battery, comprising:

[0046] Step 1: integrate the lithium battery pack and the battery management system according to the capacity and voltage range;

[0047] Step 2: obtain the nonlinear electrical characteristics of the open-circuit voltage and the remaining capacity SOC of the lead-acid battery type, and the equivalent circuit parameter model, and store them in the system;

[0048] Step 3: judge the system state, if the system is stopped, stop output and enter the low-power storage mode according to the established control strategy, and end the control process, if the system is normally running, execute step 4;

[0049] Step 4: judge whether the system can complete the communication handshake, if yes, execute step 4-1, otherwise execute step 5;

[0050] Step 4-1: send the battery SOC condition, historical operation data and other key information to the intelligent detector, and receive the detection strategy issued by the intelligent detector, and complete the battery detection or maintenance action as needed;

[0051] Step 4-2: the intelligent detector determines the health state of the battery pack according to the detection data, if the determination is healthy, continue to step 1, if the determination is abnormal, lock the charge-discharge function of the battery pack and end the control;

[0052] Step 5: judge whether the system is connected to the charging device, if yes, execute step 5-1, otherwise execute step 6;

[0053] Step 5-1: read the identification information sent by the charger and compare with the preset information, judge whether it is a special charger, if yes, execute step 5-2, otherwise execute step 5-3; Step 5-2: the battery management system opens the charging MOSFET, executes the charging function, and is responsible for executing the related charging protection strategy, and after the charging is completed, the battery management system judges the battery pack health status, if it is healthy, it continues to step 1, if it is abnormal, it locks the battery pack charging and discharging function and ends the control;

[0054] Step 5-3: the battery management system continuously closes the MOSFET, executes the charging function, and is responsible for executing the related protection strategy, while continuously monitoring the battery pack and battery management system health status, if it is healthy, it continues to step 1, if it is abnormal, it locks the battery pack charging and discharging function and ends the control;

[0055] Step 6: normally execute the protection strategy by the battery management system and run, while monitoring whether the standby time is overdue, if yes, execute step 7, otherwise execute step 6-1;

[0056] Step 6-1: read the battery state by the power correction module, calculate the lead-acid battery voltage matched with it, then output the simulated lead-acid battery voltage to the vehicle instrument, and the battery management system is responsible for executing the related protection strategy, while continuously monitoring the battery pack and battery management system health status, if it is healthy, it continues to step 1, if it is abnormal, it locks the battery pack charging and discharging function and ends the control;

[0057] Step 7: execute the storage mode control strategy by the battery management system.

[0058] The application provides a lithium battery integrated system and control method for simulating the electrical characteristics of lead-acid batteries; the idea of calculating the output characteristics of the simulated lead-acid battery according to the equivalent circuit of the lead-acid battery can not only simulate the open-circuit voltage characteristics, but also simulate the output characteristics under charging and discharging.

[0059] In summary, the application realizes the matching of the lithium battery pack and the special charger through the charging and discharging circuit communication method, ensures the safe use of the battery pack during charging, and adds a power correction module for the electric vehicle matching, which can realize accurate power display of the original instrument without damaging the vehicle instrument and circuit, eliminates unsafe wiring modification, and improves the running safety after replacing the lead-acid battery with the lithium battery.

[0060] The foregoing description illustrates and describes several preferred embodiments of the present application, but it is to be understood that the application is not limited to the above-described forms, and that it should not be seen as excluding other embodiments, but rather as being applicable in a variety of other combinations, modifications and environments, and capable of being altered in various ways within the scope of the inventive concept as described herein, by means of the teachings contained herein or knowledge of the relevant art. Any alterations and further modifications in the described embodiments are to be considered as falling within the scope of the present application as defined by the appended claims, provided that such alterations and further modifications do not depart from the spirit and scope of the present application.

Claims

1. A control method of a lithium battery integrated system based on replacement of a lead acid battery, characterized by, The lithium battery integrated system for replacing lead-acid battery comprises a lithium battery module, a special charger, a vehicle controller, a power correction module, and a smart detector connected to the lithium battery module, wherein the lithium battery module comprises a lithium battery pack and a battery management system, the lithium battery pack has lithium battery strings connected in series or in parallel inside, and the battery management system is connected to the lithium battery pack; the special charger supplies power to the lithium battery module; the vehicle controller is connected to the lithium battery module; the power correction module is connected to the vehicle controller and vehicle instruments; and the battery management system has a charger identification module that can identify the special charger and non-matching chargers during charging. The control method comprises: Step 1: integrating the lithium battery pack and the battery management system according to the capacity and voltage range; Step 2: obtaining the nonlinear electrical characteristics of the open-circuit voltage and the remaining power SOC of the lead-acid battery type, and the equivalent circuit parameter model, and storing them to the system; Step 3: judging the system state, if the system is stopped, stopping output and entering the low-power storage mode according to the established control strategy, ending the control process, if the system is normally running, executing Step 4; Step 4: judging whether the system can complete the communication handshake, if yes, executing Step 4-1, otherwise, executing Step 5; Step 4-1: sending the battery SOC status, historical operation data and other key information to the smart detector, and receiving the detection strategy issued by the smart detector, and cooperating to complete the battery detection or maintenance action as needed; Step 4-2: judging the battery pack health state by the smart detector according to the detection data, if the battery pack is healthy, continuing to Step 1, if the battery pack is abnormal, locking the battery pack charging and discharging function and ending the control; Step 5: judging whether the system is connected to a charging device, if yes, executing Step 5-1, otherwise, executing Step 6; Step 5-1: reading the identification information sent by the charger and comparing it with the preset information to judge whether it is a special charger, if yes, executing Step 5-2, otherwise, executing Step 5-3; Step 5-2: the battery management system opens the charging MOSFET, executes the charging function, and is responsible for executing the related charging protection strategy, after the charging is completed, the battery management system judges the battery pack health state, if the battery pack is healthy, continuing to Step 1, if the battery pack is abnormal, locking the battery pack charging and discharging function and ending the control; Step 5-3: the battery management system continuously closes the MOSFET, executes the charging function, and is responsible for executing the related protection strategy, while continuously monitoring the battery pack and the battery management system health state, if the battery pack and the battery management system are healthy, continuing to Step 1, if the battery pack and the battery management system are abnormal, locking the battery pack charging and discharging function and ending the control; Step 6: the battery management system normally executes the protection strategy and runs, while monitoring whether the standby time is overdue, if yes, executing Step 7, otherwise, executing Step 6-1; Step 7: the battery management system enters the low-power storage mode according to the established control strategy, ending the control process. Step 6-1: reading the battery state by the electricity correction module, calculating the matched lead-acid battery voltage, outputting the simulated lead-acid battery voltage to the vehicle instrument, and executing the relevant protection strategy by the battery management system, while continuously monitoring the battery pack and the battery management system health, if the health is determined, continue to step 1, if the abnormality is determined, lock the battery pack charging and discharging function and end the control; Step 7: executing the warehouse mode control strategy by the battery management system.

2. The control method of the lithium battery integrated system based on a replacement lead-acid battery according to claim 1, characterized by, The special charger has a charging and discharging circuit communication module, which is matched with the charger identification module of the battery management system.

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