CN210669575U

CN210669575U - Lithium battery

Info

Publication number: CN210669575U
Application number: CN201921783270.9U
Authority: CN
Inventors: 孙富; 董杉木
Original assignee: Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
Current assignee: Qingdao Institute of Bioenergy and Bioprocess Technology of CAS
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-06-02
Anticipated expiration: 2029-10-23

Abstract

The utility model relates to a lithium battery, which comprises a shell, a charging circuit, a lithium battery body and a chip, wherein the charging circuit, the lithium battery body and the chip are arranged in the shell; the shell is provided with a positive electrode lug and a negative electrode lug which are connected with a charging circuit, the chip is respectively connected with the charging circuit and a USB interface arranged on the shell, the charging circuit is connected with the lithium battery body, and the lithium battery body is charged and discharged through the charging circuit. The lithium battery body comprises a diaphragm, an anode and a cathode, the charging circuit comprises an adjustable voltage stabilizing circuit, an adjustable constant current circuit, a charging indicating circuit and an AC/DC circuit, and further comprises an SD card or an LED display screen arranged on the shell and a digital temperature sensor used for measuring the internal and external temperatures of the lithium battery. The utility model discloses a lithium cell promotes convenient to use nature and further promotes the development in lithium cell market to the use and the efficiency that promote the lithium cell and has the significance.

Description

Lithium battery

Technical Field

The utility model relates to an energy storage and utilization technique especially relates to a structural design is reasonable, the extensive lithium cell of range of application.

Background

In the last 90 th century, lithium ion batteries successfully applied commercially by sony corporation have been widely used in various mobile consumer electronics products, such as smart phones, notebook computers and digital cameras, due to their advantages of high energy density, high open-circuit voltage, large output power, low self-discharge rate, wide working temperature range, and the like. With the development of the times and the progress of science and technology, besides traditional consumer electronics, the application field of lithium ion batteries is gradually expanded into some newly emerging industries, such as unmanned aerial vehicles, intelligent robots, intelligent sound boxes, wearable devices, electric hand tools, electric bicycles, pure electric vehicles, large green energy storage power stations, aerospace devices and the like. Lithium ion batteries have become an indispensable energy storage and supply system in modern society.

However, in actual use, serious consequences occur occasionally because a user cannot accurately know some important parameters of the lithium ion battery. The event that the electric vehicle is suddenly anchored on the expressway and a car accident occurs due to the fact that the battery management system of the electric vehicle cannot accurately predict the residual capacity of the battery has been reported in the news. The phenomenon that the mobile phone is suddenly turned off in the using process happens occasionally because the mobile phone battery management system cannot reliably judge the residual capacity of the mobile phone battery. Because the user can not know the use history, the actual battery capacity, the actual residual battery capacity, the instant battery health state, the actual residual battery service life and other important parameters of the lithium battery, the user can not use the lithium battery reasonably and efficiently. Therefore, it is important to accurately and reliably know the detailed usage record of the lithium battery and accurately determine the actual remaining battery capacity, the instant health status and the actual remaining battery life of the lithium battery.

Taking a smart phone battery as an example, a smart phone sold in the market basically relies on an independent battery management system to perform real-time monitoring and management on a lithium battery. The method can avoid redesign of the lithium battery and simplify the complexity of the internal circuit of the battery. However, this method makes the software algorithm of the battery management system on the mobile phone side very complicated, and cannot detect the self-discharge behavior of the battery itself in real time. However, since the capacity and performance of the lithium battery may change with the conditions such as the temperature of the battery working environment, the number of charging and discharging times, and the service time, the battery management system at the mobile phone side cannot accurately predict the remaining service life of the battery at present. According to the above analysis, currently, the battery management system separated from the lithium battery cannot accurately and reliably judge important parameters of the lithium battery, such as the actual remaining battery capacity, the instant health state, the actual remaining battery service life, and the like.

Integrating the battery management system with the lithium battery may solve this problem. Chinese CN 109038708A patent discloses an intelligent lithium battery, which comprises a plurality of intelligent lithium battery units for controlling a battery pack, and an intelligent battery pack management module for managing and controlling the intelligent lithium battery units. In the patent, the intelligent management module in each intelligent lithium battery unit is only limited to independently charge and discharge and monitor input and output voltages of the battery unit. Parameters such as the ambient temperature of the battery, the internal temperature of the battery, the magnitude of charging and discharging current, the magnitude of charging and discharging electric quantity, the charging and discharging working time, the health state of the battery and the like of the battery unit in each charging and discharging process cannot be monitored and managed. And the patent does not propose to arrange a data processing center to calculate important parameters such as the actual remaining battery capacity, the instant health state and the actual remaining battery service life of the lithium battery. In addition, the patent does not provide a special data storage and reading device for reading and utilizing the parameters, so that the user cannot effectively read the recorded data. How to intelligently realize the high-efficient integration of battery management system and lithium cell and realize that accurate, reliably judge important parameters such as the actual residual battery capacity, the instant health status and the actual residual battery life of lithium cell, to promoting the use and the utilization efficiency of lithium cell, promote user's convenient to use nature and further promote the development of lithium cell market and have important practical application meaning.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can't the accurate, judge the actual residual battery capacity and the actual residual battery life scheduling problem of lithium cell reliably for overcoming existence in the current lithium cell use, the utility model provides a structural design is reasonable, reliable degree height and the extensive novel intelligent chargeable lithium cell of range of application.

In order to achieve the above object, the utility model adopts the following technical scheme: a lithium battery, comprising: the shell, a charging circuit, a lithium battery body and a chip are arranged in the shell; the shell is provided with a positive electrode lug and a negative electrode lug which are connected with a charging circuit, the chip is respectively connected with the charging circuit and a USB interface arranged on the shell, the charging circuit is connected with the lithium battery body, and the lithium battery body is charged and discharged through the charging circuit to realize the storage and the release of electric energy.

The lithium battery body comprises a diaphragm, a positive electrode and a negative electrode.

The charging circuit includes: the charging circuit comprises an adjustable voltage stabilizing circuit, an adjustable constant current circuit and a charging indicating circuit.

The adjustable voltage stabilizing circuit and the adjustable constant current circuit comprise: 3 branches connected in parallel between the positive pole and the negative pole of the input end and the output end: the first branch circuit comprises a resistor R3 and a triode Q2 which are connected in parallel and then connected with a controllable precision voltage-stabilizing source TL431, the second branch circuit is an adjustable resistor W1, and the third branch circuit is a triode Q3, an adjustable resistor W2 and a resistor R5 which are connected in sequence.

The charge indication circuit includes: the positive electrode of the input end is connected with the collector of a triode Q2 through a resistor R1, the positive electrode of the input end is connected with the emitter of a triode Q1, the base of the triode Q1 is connected with the collector of a triode Q2 through a resistor R2, and the collector of a triode Q1 is connected with the positive electrode of the output end through a light-emitting diode LED and a resistor R4.

And an AC/DC circuit for converting 220V commercial power into direct current is connected between the input end of the charging circuit and the positive and negative electrode lugs.

The AC/DC circuit includes: the 220V mains supply is connected with the bridge rectifier circuit after being reduced in voltage through the transformer T, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4 are connected between the bridge rectifier circuit and the output end in parallel, a three-terminal voltage regulator LM7805 is further connected between the capacitor C2 and the capacitor C3, and the other end of the three-terminal voltage regulator LM7805 is grounded.

The LED display screen is arranged on the shell and electrically connected with the chip.

Still including setting up the inside digital temperature sensor who is used for measuring the inside temperature of lithium cell in the shell respectively and setting up the outside digital temperature sensor who is used for measuring ambient temperature outside the shell, inside digital temperature sensor, outside digital temperature sensor and chip electric connection.

The utility model has the advantages that:

the traditional mode of separating the lithium battery from the battery management system is avoided, and the lithium battery and the battery management system are integrated efficiently and intelligently. The utility model discloses a charge-discharge current of intelligent battery ability accurate record in the charge-discharge process each time, the charge-discharge time, the inside and outside operating temperature of charge-discharge in-process battery, charge-discharge number of times isoparametric, the actual electric quantity size of charge-discharge in-process, battery charge-discharge efficiency and prepare and judge important parameters such as actual battery residual capacity and actual residual battery life. The data storage SD card or the data LED display screen and the external data reading USB interface are newly added, so that a battery user can conveniently know important parameters such as the use history of the lithium battery, the instant health state of the battery, the actual service life of the remaining battery and the like in time.

Drawings

FIG. 1 is a schematic diagram of a lithium battery;

FIG. 2 is a schematic diagram of a lithium battery charging curve;

fig. 3 is a circuit diagram of a change from mains voltage to dc charging current;

FIG. 4 is a charging circuit diagram;

FIG. 5 is a circuit diagram of a processing chip;

FIG. 6 is a circuit diagram of power management of a processing chip;

FIG. 7 is a circuit diagram of current sampling of the processing chip;

FIG. 8 is a circuit diagram of the connection of the charge completion read of the processing chip;

FIG. 9 is a circuit diagram of an SD card connected to a processing chip;

FIG. 10 is a circuit diagram of a liquid crystal display connected to the smart chip;

in the figure: 1. a negative tab of a lithium battery; 2. a positive tab of a lithium battery; 3. a lithium battery case; 4. a data storage SD card or a data LED display screen; 5. an external data reading USB interface; 6. an intelligent chip; 7. a charging circuit; 9. a lithium battery separator; 8. a lithium battery positive electrode; 10. a negative electrode of a lithium battery; 11. an internal digital temperature sensor; 12. an external digital temperature sensor; 13. lithium cell body.

Detailed Description

In order to make the objects and technical solutions of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. The raw materials used in the examples are all those commonly used in the art, and the methods used in the examples are all those conventional in the art, unless otherwise specified.

As shown in fig. 1, the present example discloses a lithium battery, specifically including: lithium battery negative pole ear 1 and positive ear 2, lithium battery shell 3, data storage SD card or data LED display screen 4, external data read USB interface 5, lithium battery intelligent chip 6, charging circuit 7, lithium battery diaphragm 9, the anodal 8 of lithium battery and lithium battery negative pole 10, inside digital temperature sensor 11 and outside digital temperature sensor 12, lithium cell body 13.

The positive and negative electrode lugs 1 and 2 are arranged on the lithium battery shell 3, are connected with the positive and negative electrodes in the lithium battery and serve as leads for charging and discharging of the lithium battery.

The lithium battery shell 3 is made of aluminum-plastic film or stainless steel and is used for sealing and protecting the whole lithium battery.

And the data storage SD card or the data LED display screen 4 is arranged on the lithium battery shell 3 and is connected with the lithium battery intelligent chip 6. The data storage SD card or the data LED display screen 4 is used to store or display data generated during the charging and discharging process, such as charging and discharging current, charging and discharging time, working temperature inside and outside the battery during the charging and discharging process, charging and discharging frequency, electric quantity during the charging and discharging process of the battery, efficiency during the charging and discharging process, and important parameters for determining the actual remaining capacity of the battery, the instant health state of the battery, and the actual service life of the remaining battery.

And the external data reading USB interface 5 is arranged on the lithium battery shell 3 and is connected with the lithium battery intelligent chip 6. The external data reading USB interface 5 is used for reading data generated in the charging process, such as charging and discharging current, charging and discharging time, internal and external working temperatures of the battery in the charging and discharging process, charging and discharging times, electric quantity of the battery in the charging and discharging process, efficiency in the charging and discharging process, and external reading of important parameters such as the actual remaining capacity of the battery, the instant health state of the battery, and the actual service life of the remaining battery, by using a USB connection.

The lithium battery intelligent chip 6 is installed inside the lithium battery and mainly used for executing intelligent charging and discharging management, intelligent battery state monitoring and intelligent data processing. The main function is for carrying out intelligent charging to the lithium cell, carries out real-time detection and record to the service behavior of lithium cell to judge the health status of lithium cell.

The lithium battery diaphragm 9 is made of a polypropylene PP film and is mainly used for separating the positive electrode 8 and the negative electrode 10 of the lithium battery and preventing the internal short circuit of the battery.

The materials of the lithium battery anode 8 and the lithium battery cathode 10 are respectively lithium cobaltate and graphite, and the main function is to ensure that the lithium battery provides normal voltage.

The internal digital temperature sensor 11 and the external digital temperature sensor 12 mainly function to detect the external ambient temperature and the internal temperature of the battery during the operation of the battery, and provide a factual support for determining the health status of the battery.

And the data storage SD card or the data LED display screen 4 is used for storing and displaying data in the charging and discharging process.

The charging curve of the lithium battery is shown in fig. 2.

The circuit diagram for changing from mains voltage to dc charging current is shown in fig. 3. The input end is connected with the mains supply, and N1 and N2 are the turns of the voltage transformer. The circuit after voltage reduction is connected with a bridge rectifier circuit, and aims to rectify a sine alternating current voltage with alternating positive and negative into a unidirectional pulse voltage. The filter capacitor C1 is connected in parallel with the bridge rectifier and mainly used for filtering the rectified ripple waveform into a direct current voltage with a small ripple waveform. The self-excited capacitor C2 is prevented from being connected in parallel with C1, and the main purpose is to further provide stable direct current voltage for LM 7805. The three-terminal voltage regulator LM7805 is connected with the filter capacitors C3 and C4 in parallel, and the purpose is to output direct-current output voltage with high precision and good stability. The specific structure of the AC/DC circuit for converting 220V commercial power into direct current comprises: the 220V mains supply is connected with a bridge rectifier circuit after being reduced in voltage through a transformer T, a filter capacitor C1, a self-excitation capacitor C2, a filter capacitor C3 and a filter capacitor C4 are connected between the bridge rectifier circuit and the output end in parallel, a three-terminal voltage regulator LM7805 is further connected between the self-excitation capacitor C2 and the filter capacitor C3, and the other end of the three-terminal voltage regulator LM7805 is grounded.

Fig. 4 is a charging circuit diagram. Q2, R3, TL431 and W1 form a precise adjustable voltage stabilizing circuit which is regulated and controlled by the voltage of the charged battery. Q3, W2 and R5 form an adjustable constant current circuit to share the charging current of the charged battery. Q1, R2, R1, LED and R4 are charging indicating circuits for indicating the working state of the charger. When the voltage of the charged battery is gradually increased, the voltage of the voltage stabilizing circuit consisting of the Q2, the R3, the TL431 and the W1 is also gradually increased, so that the voltage of the R1 is gradually reduced, and finally the Q1 is cut off, and the LED lamp is changed. The circuit structure specifically comprises an adjustable voltage stabilizing circuit 71, an adjustable constant current circuit 72 and a charging indicating circuit 73. The adjustable voltage stabilizing circuit 71 and the adjustable constant current circuit 72 include: 3 branches connected in parallel between the positive pole and the negative pole of the input end and the output end: the first branch circuit comprises a resistor R3, wherein the two ends of the resistor R3 are respectively connected with a collector and a base of a triode Q2, the base of a triode Q2 is grounded through a controllable precision voltage-stabilizing source TL431, the emitter of the triode Q2 is respectively connected with an emitter of an adjustable resistor W1 and an emitter of a triode Q3, the other end of the adjustable resistor W1 is grounded, the base of the triode Q3 is grounded through an adjustable resistor W2 and a resistor R5, and the collector of the triode Q3 is connected with an output end. The charge instruction circuit 73 includes: the positive electrode of the input end is connected with the collector of a triode Q2 through a resistor R1, the positive electrode of the input end is connected with the emitter of a triode Q1, the base of the triode Q1 is connected with the collector of a triode Q2 through a resistor R2, and the collector of a triode Q1 is connected with the positive electrode of the output end through a light-emitting diode LED and a resistor R4.

The control circuit includes: the core processor adopts STM32F103C8T6 as a processing chip (as shown in fig. 5), a power management unit (as shown in fig. 6) for supplying power to the processing chip, a current sampling unit (as shown in fig. 7) of the intelligent processing chip, a charging completion reading unit (as shown in fig. 8) of the processing chip, an SD card storage unit (as shown in fig. 9) connected with the processing chip, and an LCD1602 liquid crystal display unit (as shown in fig. 10) connected with the processing chip.

In fig. 5, pin 1 of the processing chip is connected to a 3.3V power supply, a crystal oscillator Y1 is connected in parallel between

pins

3 and 4, pin 3 is grounded through a capacitor C2, and pin 4 is grounded through C3. A crystal oscillator Y2 and a resistor R2 are connected between the

pins

5 and 6 in parallel, the pin 5 is grounded through a capacitor C6, and the pin 6 is grounded through a capacitor C7. Pin 8 is connected to ground, and pin 9 is connected to 3.3V power supply and then to ground through capacitor C8. Pin 11(ADC1 signal) is connected to the ADC1 signal (current sample signal) in fig. 7. Pin 13(PA3 signal) is connected to the PA3 signal (charge complete read signal) in fig. 8. Pins 14-17

connect pins

1, 2, 5, and 7, respectively, of the SD card memory unit in fig. 10. Pins 20-22 are connected to pins 4-6, respectively, of the LCD1602 LCD unit of fig. 10. Pin 23 is connected to ground, pin 24 is connected to a 3.3V power supply, and a capacitor C10 is connected between pin 23 and pin 24. Pin 35 is connected to ground, pin 36 is connected to a 3.3V power supply, and a capacitor C5 is connected between pin 35 and pin 36.

In fig. 6, the processing chip STM32F103C8T6 is powered by adjusting the 5 volt input voltage to a 3.3 volt regulated output voltage using voltage regulator ASM 1117. The ASM1117 pin 3 is connected with an input 5V voltage, the pin 1 is grounded, and the pin 2 and the pin 4 are connected with an auxiliary circuit. The auxiliary circuit comprises a capacitor C15, a capacitor C16, an LED indicator light D4, a resistor R6 and a 3.3V voltage output end. The 3.3V voltage output is connected to the 3.3V input in fig. 5.

In fig. 7, in the current sampling unit of the processing chip, the terminal P2 is connected to the 3.3V power supply through the sliding resistor R4 via the diode D1, is grounded through the diode D2, and outputs the ADC1 signal to the pin 11 of the processing chip, and the terminal P2 is also connected in series with the output terminal in fig. 4. In fig. 8, the charge completion read unit, PA3 signal (charge completion read signal) is connected to terminal P4, and terminal P4 is also connected in parallel to the output terminal in fig. 4. Fig. 9 is a circuit diagram showing the connection between the memory unit of the SD card and the processing chip. Fig. 10 is a circuit diagram of the LCD1602 with the LCD unit connected to the processing chip.

The utility model discloses a number of times that charges of this lithium cell can be updated automatically to the lithium cell, and battery operational environment temperature when the record charges calculates the electric quantity of charging through charging current and charge time, calculates this time charge capacity and last charge capacity's capacity etc.. And judging the actual battery capacity according to all the charging records, predicting the actual service life of the remaining battery and the like. The above parameters can be read by the data storage SD card or the data LED display screen 4, and can also be read by the external data reading USB interface 5. The parameters provide real and reliable battery parameters for users, so that the use experience of the users is greatly improved, and the work use efficiency of the intelligent lithium battery is improved.

The preferred embodiments described above are merely exemplary of the disclosed examples, and all changes and modifications that can be made to the disclosed examples by equivalent substitutions or by equivalent changes and modifications are intended to be within the scope of the claims.

Claims

1. A lithium battery, comprising: the lithium battery comprises a shell (3), and a charging circuit (7), a lithium battery body (13) and a chip (6) which are arranged in the shell; the shell (3) is provided with a positive electrode tab (1) and a negative electrode tab (2) which are connected with the charging circuit (7), the chip (6) is respectively connected with the charging circuit (7) and the USB interface (5) arranged on the shell, the charging circuit (7) is connected with the lithium battery body (13), and the lithium battery body (13) is charged and discharged through the charging circuit (7) to realize the storage and the release of electric energy.

2. A lithium battery as claimed in claim 1, characterized in that the lithium battery body (13) comprises a separator (9) and a positive electrode (8) and a negative electrode (10).

3. A lithium battery as claimed in claim 1, characterized in that the charging circuit (7) comprises: the charging circuit comprises an adjustable voltage stabilizing circuit (71), an adjustable constant current circuit (72) and a charging indicating circuit (73).

4. A lithium battery according to claim 3, characterized in that the adjustable voltage regulation circuit (71) and the adjustable constant current circuit (72) comprise: 3 branches connected in parallel between the positive pole and the negative pole of the input end and the output end: the first branch circuit comprises a resistor R3 and a triode Q2 which are connected in parallel and then connected with a controllable precision voltage-stabilizing source TL431, the second branch circuit is an adjustable resistor W1, and the third branch circuit is a triode Q3, an adjustable resistor W2 and a resistor R5 which are connected in sequence.

5. A lithium battery as claimed in claim 3, characterized in that said charge indication circuit (73) comprises: the positive electrode of the input end is connected with the collector of a triode Q2 through a resistor R1, the positive electrode of the input end is connected with the emitter of a triode Q1, the base of the triode Q1 is connected with the collector of a triode Q2 through a resistor R2, and the collector of a triode Q1 is connected with the positive electrode of the output end through a light-emitting diode LED and a resistor R4.

6. A lithium battery as claimed in claim 3, characterized in that an AC/DC circuit for converting 220V mains to direct current is connected between the input of the charging circuit (7) and the positive and negative electrode lugs.

7. A lithium battery as claimed in claim 6, characterized in that the AC/DC circuit comprises: the 220V mains supply is connected with the bridge rectifier circuit after being reduced in voltage through the transformer T, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4 are connected between the bridge rectifier circuit and the output end in parallel, a three-terminal voltage regulator LM7805 is further connected between the capacitor C2 and the capacitor C3, and the other end of the three-terminal voltage regulator LM7805 is grounded.

8. The lithium battery according to any one of claims 1 to 7, further comprising an SD card or an LED display screen disposed on the housing, wherein the SD card or the LED display screen is electrically connected to the chip (6).

9. A lithium battery according to any of claims 1-7, characterized in that it further comprises an internal digital temperature sensor (11) for measuring the internal temperature of the lithium battery and an external digital temperature sensor (12) for measuring the ambient temperature, which are respectively arranged inside the housing, the internal digital temperature sensor (11) and the external digital temperature sensor (12) being electrically connected to the chip (6).