CN211653096U - Lithium battery charger with battery health monitoring function - Google Patents
Lithium battery charger with battery health monitoring function Download PDFInfo
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- CN211653096U CN211653096U CN202020049018.1U CN202020049018U CN211653096U CN 211653096 U CN211653096 U CN 211653096U CN 202020049018 U CN202020049018 U CN 202020049018U CN 211653096 U CN211653096 U CN 211653096U
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Abstract
The utility model relates to a take battery health degree monitoring function's lithium battery charger belongs to lithium battery charger technical field. The device comprises a front-stage AC/DC converter, a first control loop, an auxiliary power supply, a rear-stage DC/DC converter, a second control loop, a key module and a digital display; the first control loop is connected with the control end of the front-stage AC/DC converter; the output end of the front-stage AC/DC converter is respectively connected with the auxiliary power supply and the input end of the rear-stage DC/DC converter; the second control loop is connected with the control end of the rear-stage DC/DC converter; the second control loop comprises an MCU microprocessor; the output end of the key module is connected with the input end of the MCU microprocessor; the output end of the MCU microprocessor is connected with the input end of the digital display. The utility model discloses realize the health degree monitoring to the lithium cell at the in-process to lithium battery charging, convenience of customers in time masters battery health. The service life of the lithium battery is prolonged.
Description
Technical Field
The utility model relates to a take battery health degree monitoring function's lithium battery charger belongs to lithium battery charger technical field.
Background
The lithium battery is an energy storage device which is widely applied in the current market. Compared with a lead-acid storage battery, the lithium battery has higher energy density and longer service life. The service life of the lithium battery is closely related to a charging management system, and the system is required to accurately control the charging process of the lithium battery so as to meet the optimal charging curve of the lithium battery. The high-performance lithium battery chargers in the current market mostly adopt a two-stage charging mode, namely, constant-current charging is adopted when the battery voltage is lower, constant-voltage charging is adopted when the battery voltage is close to the rated upper limit, and the mode is very attached to the optimal charging curve of the lithium battery, so that the battery is well protected. There are some professional lithium battery health status detectors, and in terms of hardware structure, a special voltage sensor, a hall current sensor and a temperature sensor are adopted to monitor various data of the battery. The health degree of the battery is estimated through complex operation, the circuit is complex, and the cost is relatively high; in the monitoring principle, many designs focus on the accuracy of a single measurement result, and have high requirements on the performance of measurement equipment and the measurement environment. (e.g., a lithium battery health status detector for pure electric vehicles, application number: 201320637707.4). In some application fields, such as garden tool lawn mowers and the like, equipment needs to satisfy the conditions of light weight and long-term high-power output, and the size and capacity of lithium batteries are restricted. This results in the frequent and rapid charging and discharging of the lithium battery for a long time, so that the aging and degradation problems of the battery become more prominent and the endurance of the device is significantly reduced. This has influenced user's use experience to a certain extent, and if the battery works for a long time under the state of performance excessive attenuation, there is certain potential safety hazard simultaneously, threatens equipment and personnel's safety.
Disclosure of Invention
The utility model aims at letting the user in time master the health information of lithium cell in the one hand, remind the user to avoid letting the lithium cell work for a long time in the state of the excessive decay of performance, avoidd the safety problem that probably causes from this to a certain extent. On the other hand, monitoring data can also be as the user to the manufacturer propose the reference condition who changes the lithium cell, simultaneously the utility model discloses the initialization button that sets up, convenience of customers is after changing the battery, and quick initialization charger monitoring data realizes the complete monitoring to each new battery, so has proposed a take battery health degree monitoring function's lithium battery charger.
In order to achieve the above purpose, the utility model adopts the following technical solutions:
a lithium battery charger with a battery health degree monitoring function comprises a front-stage AC/DC converter, a first control loop, an auxiliary power supply, a rear-stage DC/DC converter, a second control loop, a key module and a digital display; the first control loop is connected with a control end of the front-stage AC/DC converter; the output end of the front-stage AC/DC converter is respectively connected with the auxiliary power supply and the input end of the rear-stage DC/DC converter; the second control loop is connected with the control end of the rear-stage DC/DC converter; the second control loop comprises an MCU microprocessor; the output end of the key module is connected with the input end of the MCU microprocessor; and the output end of the MCU microprocessor is connected with the input end of the digital display.
Further as the preferred technical solution of the present invention, the first control loop adopts a control loop based on the UCC28019A chip, and is used for providing a stable voltage for the post-stage DC/DC converter.
Further, as a preferred technical solution of the present invention, the second control loop adopts a control loop based on an L6599A chip; the MCU microprocessor is connected with the L6599A chip; the L6599A chip is used for regulating output power; and the MCU microprocessor acquires output voltage and output current information and is used for protecting the charger.
Further as the preferred technical scheme of the utility model, the MCU microprocessor includes digital-to-analog converter, arithmetic unit, data memory cell; the digital-to-analog converter is used for performing digital-to-analog conversion on the output voltage and output current information and respectively sending the converted output voltage and output current information to the operation unit and the data storage unit; the data storage unit is used for storing output voltage and output current information and charging electric quantity information; the operation unit is used for analyzing the charging electric quantity information in each charging process of the external lithium battery according to the output voltage and the output current information and sending the charging electric quantity information to the data storage unit; and analyzing the battery health degree information according to the charging electric quantity information obtained in the charging process for multiple times, and sending the battery health degree information to a digital display.
Further as a preferred technical solution of the present invention, the key module includes first to third buttons; the first button, the second button, the third button and the fourth button are all connected with the input end of the MCU microprocessor.
Further as the utility model discloses a preferred technical scheme, digital display adopts two nixie tube displayers for show battery health degree information.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
(1) the health degree monitoring of the lithium battery is realized in the process of charging the lithium battery, and a user can conveniently and timely master the health state of the battery.
(2) The service life of the lithium battery is prolonged.
(3) The lithium battery is prevented from working under the condition of excessive performance attenuation for a long time, and the safety of equipment and personnel is guaranteed.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is an external view of the present invention;
FIG. 3 is a schematic block diagram of the MCU microprocessor connection of the present invention;
FIG. 4 is a schematic diagram of a half-bridge resonant DC/DC closed-loop circuit of the present invention;
FIG. 5 is a schematic diagram of the AC/DC closed loop circuit of the present invention;
FIG. 6 is a schematic diagram of an auxiliary power supply circuit of the present invention;
fig. 7 is a schematic diagram of the display circuit and the key circuit of the present invention.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
as shown in fig. 1 and 2, a lithium battery charger with a battery health monitoring function includes a front-stage AC/DC converter, a first control loop, an auxiliary power supply, a rear-stage DC/DC converter, a second control loop, a key module, and a digital display; the first control loop is connected with the control end of the front-stage AC/DC converter; the output end of the front-stage AC/DC converter is respectively connected with the auxiliary power supply and the input end of the rear-stage DC/DC converter; the second control loop is connected with the control end of the rear-stage DC/DC converter; the second control loop comprises an MCU microprocessor; the output end of the key module is connected with the input end of the MCU microprocessor; the output end of the MCU microprocessor is connected with the input end of the digital display. As shown in fig. 5, the first control loop adopts a control loop based on the UCC28019A chip for providing a stable voltage for the DC/DC converter of the later stage. As shown in fig. 4, the second control loop adopts a control loop based on an L6599A chip; the MCU microprocessor is connected with the L6599A chip; the L6599A chip is used for regulating output power; the MCU microprocessor collects the output voltage and output current information for protecting the charger. As shown in fig. 3, the MCU microprocessor includes a digital-to-analog converter, an arithmetic unit, and a data storage unit; the digital-to-analog converter is used for performing digital-to-analog conversion on the output voltage and output current information and respectively sending the converted output voltage and output current information to the operation unit and the data storage unit; the data storage unit is used for storing output voltage and output current information and charging electric quantity information; the operation unit is used for analyzing the charging electric quantity information in each charging process of the external lithium battery according to the output voltage and the output current information and sending the charging electric quantity information to the data storage unit; and analyzing the battery health degree information according to the charging electric quantity information obtained in the charging process for multiple times, and sending the battery health degree information to a digital display. As shown in fig. 6, it is a schematic diagram of the auxiliary power circuit of the present invention. As shown in fig. 7, the key module includes first to third buttons; the first button, the second button, the third button and the fourth button are connected with the input end of the MCU microprocessor. The digital display adopts a two-digit nixie tube display and is used for displaying the health degree information of the battery.
The utility model discloses a preceding stage power circuit topology adopts the Boost converter, can adopt the control scheme based on UCC28019A chip, realizes 380v output, provides stable voltage for back level DC/DC converter to realize the unit power factor correction of input side. The rear-stage DC-DC converter adopts a half-bridge isolation type LLC resonant converter, a control scheme based on an L6599A chip can be adopted, and the L6599A chip is used for adjusting output power and realizing control over direct-current output voltage or output current. The second control circuit of the charger rear-stage DC/DC converter comprises an MCU microprocessor; the MCU microprocessor is connected with the L6599A chip; the MCU microprocessor collects the output voltage and output current information for protecting the charger. The MCU microprocessor in the second control circuit of the DC/DC converter at the rear stage of the charger acquires the output voltage and output current information of the charger, stores the information in a storage unit of the MCU microcontroller after analog-to-digital conversion, and correspondingly calculates through an arithmetic unit to obtain the electric quantity output to the lithium battery in each charging process. And then, the health degree of the lithium battery is evaluated by the estimation method of the SOC (state of charge) and the SOH (state of health) of the lithium battery according to the information. Three buttons and a two-digit nixie tube display are arranged on the charger. The three buttons are respectively connected with the MCU, and different functions can be realized after the buttons are pressed by a user. The nixie tube display is output and controlled by the MCU microcontroller and is used for displaying information such as battery health degree and the like.
During specific implementation, when a user uses the device for the first time, the input end of the charger is connected to the commercial power, the output end of the charger is connected to the lithium battery, and the charger enters a standby state. The user is then required to simultaneously press the first button and the second button to initialize the charger data. The charger defaults to 99% initial health of the battery due to first use. The user presses the first button and the charger begins the charging process. In the process, the MCU microprocessor accurately monitors and records the voltage and current data output by the charger in detail, the voltage data is used for estimating the residual capacity of the battery, and the current data calculates the energy obtained in the charging process by an ampere-hour integration method
These data are stored in the MCU microcontroller. During each subsequent charging process, these operations are performed and compared to estimate battery health. For example, the following steps are carried out: assuming that during the first charge of the battery (the battery charge is charged from a% to b%), the actual charge is measured and calculated as q1The corresponding electric quantity of each 1% is
The SOC value of the battery is generally estimated from the open-circuit voltage of the battery, but in two different charging processes, the actual electric quantity output by the charger to the lithium battery is different due to different degrees of battery attenuation. If the nth charging process (the battery capacity is charged from c% to d%), the actual charging capacity is q%nThen, every 1% of the corresponding electric quantity is, and the difference between the two charging processes is compared with the first time, the battery health degree can be estimated as:
for more accurate data, corresponding estimation is carried out on each charging, and an average value is obtained to be used as a final health degree estimation value (SOH) of the lithium battery. After charging is completed each time, when the user presses the third button, the lithium battery health degree information (SOH) can be displayed on the nixie tube. According to the IEEEStd1188-1996 related regulations, when the battery capacity is below 80% of the design capacity, replacement is required. After the user replaces the new battery, the first button and the second button can be pressed simultaneously before the initial charging, the charger monitoring data is initialized, and the health degree monitoring is started for the new battery.
The utility model discloses an aspect lets the user in time master the health information of lithium cell, reminds the user to avoid letting the lithium cell work for a long time in the state of the excessive decay of performance, has avoidd the safety problem that probably causes from this to a certain extent. On the other hand, monitoring data can also be as the user to the manufacturer propose the reference condition who changes the lithium cell, simultaneously, the utility model discloses the initialization button that sets up, convenience of customers is after changing the battery, and quick initialization charger monitoring data realizes the complete monitoring to each new battery.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A lithium battery charger with a battery health degree monitoring function is characterized by comprising a front-stage AC/DC converter, a first control loop, an auxiliary power supply, a rear-stage DC/DC converter, a second control loop, a key module and a digital display; the first control loop is connected with a control end of the front-stage AC/DC converter; the output end of the front-stage AC/DC converter is respectively connected with the auxiliary power supply and the input end of the rear-stage DC/DC converter; the second control loop is connected with the control end of the rear-stage DC/DC converter; the second control loop comprises an MCU microprocessor; the output end of the key module is connected with the input end of the MCU microprocessor; and the output end of the MCU microprocessor is connected with the input end of the digital display.
2. The lithium battery charger with the battery health monitoring function according to claim 1, wherein the first control loop adopts a control loop based on a UCC28019A chip for providing a stable voltage for a post-stage DC/DC converter.
3. The lithium battery charger with battery health monitoring function according to claim 1, wherein the second control loop is a control loop based on an L6599A chip; the MCU microprocessor is connected with the L6599A chip; the L6599A chip is used for regulating output power; and the MCU microprocessor acquires output voltage and output current information and is used for protecting the charger.
4. The lithium battery charger with the battery health monitoring function according to claim 3, wherein the MCU microprocessor comprises a digital-to-analog converter, an arithmetic unit, and a data storage unit; the digital-to-analog converter is used for performing digital-to-analog conversion on the output voltage and output current information and respectively sending the converted output voltage and output current information to the operation unit and the data storage unit; the data storage unit is used for storing output voltage and output current information and charging electric quantity information; the operation unit is used for analyzing the charging electric quantity information in each charging process of the external lithium battery according to the output voltage and the output current information and sending the charging electric quantity information to the data storage unit; and analyzing the battery health degree information according to the charging electric quantity information obtained in the charging process for multiple times, and sending the battery health degree information to a digital display.
5. The lithium battery charger with battery health monitoring function according to claim 1, wherein the button module includes first to third buttons; the first button, the second button, the third button and the fourth button are all connected with the input end of the MCU microprocessor.
6. The lithium battery charger with battery health monitoring function according to claim 4, wherein the digital display is a two-digit digital display for displaying battery health information.
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| CN202020049018.1U CN211653096U (en) | 2020-01-10 | 2020-01-10 | Lithium battery charger with battery health monitoring function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113525117A (en) * | 2021-08-13 | 2021-10-22 | 泉州市贝瓦电子技术有限公司 | System and method for intelligently feeding back battery health state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113525117A (en) * | 2021-08-13 | 2021-10-22 | 泉州市贝瓦电子技术有限公司 | System and method for intelligently feeding back battery health state |
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Effective date of registration: 20230814 Address after: Building 1, No. 18 Xiangfeng Road, Jiangning Street, Jiangning District, Nanjing City, Jiangsu Province, 211162 Patentee after: Nanjing Dingrui Technology Co.,Ltd. Address before: No.219, ningliu Road, Jiangbei new district, Nanjing, Jiangsu Province, 210032 Patentee before: Nanjing University of Information Science and Technology |
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