CN217445057U - Lithium battery protection plate's isolating device and lithium battery unit that charges - Google Patents
Lithium battery protection plate's isolating device and lithium battery unit that charges Download PDFInfo
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- CN217445057U CN217445057U CN202221409843.3U CN202221409843U CN217445057U CN 217445057 U CN217445057 U CN 217445057U CN 202221409843 U CN202221409843 U CN 202221409843U CN 217445057 U CN217445057 U CN 217445057U
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Abstract
The utility model provides a charging isolation device of a lithium battery protection plate and a lithium battery device, wherein the charging isolation device comprises a main control chip and a charging control circuit which are electrically connected; the charging control circuit is electrically connected with a charging control pin of the lithium battery protection board, and the lithium battery protection board is electrically connected with the charger; the main control chip is used for sending a first driving signal to the charging control circuit and driving a charging loop in the charging control circuit to be conducted so as to charge the lithium battery; the charging control circuit is also used for sending a first charging signal to the main control chip after the charging loop is conducted; the main control chip is also used for driving the charging loop in the charging control circuit to be closed or opened based on the first charging signal; the utility model discloses an isolating device charges compares in traditional diode isolation design, need not to upgrade the machine that charges, has expanded isolating device's that charges use scene, has reduced the input cost, has realized the mouth isolation protection and the excess temperature protect function that charge, has effectively guaranteed battery security performance.
Description
Technical Field
The utility model relates to a lithium cell technical field, in particular to lithium battery protection shield's isolating device and lithium cell device that charge.
Background
Lithium ion batteries (lithium batteries for short) are used as new-generation batteries and have been applied in various fields; however, in the current design of the lithium battery protection board, most manufacturers do not design the isolation of the charging interface by default.
In the existing design of isolating a charging interface, a diode is arranged at the charging interface of a lithium battery protection board, and the unidirectional conductivity of the diode is utilized to enable a charging loop of a lithium battery to be charged only and not to be discharged so as to control the charging process.
Although the diode is added to the prior art as a charging interface isolation design, the lithium battery cannot be discharged to the outside through CH +/CH- (namely a charging interface), but simultaneously, because the diode needs a minimum voltage drop of about 0.7V for unidirectional conduction, if the lithium battery needs to be fully charged, the charging voltage of the charger must be designed to be about 0.7V greater than the full charging voltage of the lithium battery, and for part of users who want to upgrade the function, the charger must be upgraded synchronously when the lithium battery is upgraded, so that the cost requirement is extremely high. In addition, because the heat loss of the diodes is relatively high, when the current is large, even though the heat generation can be reduced as much as possible by connecting a plurality of diodes in parallel, the heat is generated, so that the lithium battery is easy to trigger the over-temperature protection during the charging process.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an isolating device and a lithium battery device of lithium battery protection shield in order to overcome prior art and not have the interface isolation design that charges or regard as the interface isolation design that charges with the diode, must upgrade the machine that charges, and the applied scene is limited, and the machine that charges upgrade cost is higher, and diode heat loss is great, leads to the condition such as the excess temperature that the lithium cell takes place easily, the defect of the security performance of unable guarantee battery.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
in a first aspect, a charging isolation device for a lithium battery protection board is provided, which is used for isolating a charging interface of the lithium battery protection board, and the charging isolation device comprises a main control chip and a charging control circuit which are electrically connected;
the charging control circuit is electrically connected with a charging control pin of the lithium battery protection board, and the lithium battery protection board is electrically connected with a charger;
the main control chip is used for sending a first driving signal to the charging control circuit and driving a charging circuit in the charging control circuit to be conducted so as to charge the lithium battery;
when the charging loop is conducted and is in a conducting state, the voltage signal of the charging control pin conforms to a preset voltage value;
the charging control circuit is also used for sending a first charging signal to the main control chip after the charging loop is conducted;
the main control chip is also used for driving the charging loop in the charging control circuit to be closed or opened based on the first charging signal;
when the first charging signal indicates that the lithium battery is fully charged, the charging loop is disconnected to isolate the charging interface.
Preferably, the charging isolation device further comprises a power supply module;
the power supply module is electrically connected with the main control chip;
the power supply module is used for receiving the first power supply voltage of the charging interface and converting and outputting the first working voltage so as to supply power to the main control chip.
Preferably, the charging isolation device further comprises a charging current amplifying circuit;
the charging current amplifying circuit is electrically connected with the power supply module, the charging control circuit and the main control chip respectively;
the power supply module is used for supplying power to the main control chip and the charging current amplifying circuit;
the charging control circuit is used for outputting an actual charging current signal to the charging current amplifying circuit after the charging loop is conducted;
the charging current amplifying circuit is used for amplifying and converting the received actual charging current signal to obtain the first charging signal and outputting the first charging signal to the main control chip.
Preferably, the charging current amplifying circuit includes a differential operational amplifying circuit.
Preferably, the differential operational amplifier circuit includes a first amplification power supply pin, a first amplification ground pin, a first amplification input pin, a second amplification input pin, and a first amplification output pin;
the first amplification power supply pin is electrically connected with a first power output pin of the power supply module and used for receiving the first working voltage;
the first amplification grounding pin is electrically connected with a first power grounding pin of the power supply module;
the first amplifying input pin is used for receiving the actual charging current signal;
the second amplification input pin is electrically connected with a first power grounding pin of the power supply module;
the first amplification output pin is used for outputting the first charging signal.
Preferably, the main control chip includes an MCU (micro controller Unit, micro control Unit, also called as a single chip microcomputer, abbreviated as MCU); the MCU comprises a first main control power supply pin, a first main control grounding pin, a first main control signal pin and a second main control signal pin;
the first master control power supply pin is electrically connected with a first power output pin of the power supply module and used for receiving the first working voltage;
the first master control grounding pin is electrically connected with a first power grounding pin of the power module;
the first master control signal pin is used for sending the first driving signal to the charging control circuit;
the second master control signal pin is used for receiving the first charging signal.
Preferably, the power supply module includes an LDO (low dropout regulator) buck power supply circuit.
Preferably, the LDO buck power supply circuit includes a first power supply pin, a first power ground pin, and a first power output pin;
the first power supply pin is electrically connected with a first charging pin of the charging interface and used for receiving the first power supply voltage;
the first power supply grounding pin is electrically connected with a second charging pin of the charging interface;
the first power output pin is used for outputting the first working voltage.
Preferably, the charge control circuit includes a first MOS Transistor (Metal-Oxide-semiconductor Field-Effect Transistor, MOS Transistor for short), a second MOS Transistor, a first triode, a second triode, a first diode, and a plurality of resistors disposed on connecting wires between the first MOS Transistor, the second MOS Transistor, the first triode, the second triode, and the first diode;
the drain electrode of the second MOS tube and the anode of the first diode are electrically connected with a second charging pin of the charging interface;
an emitter of the first triode is electrically connected with the charging control pin;
the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube;
the grid electrode of the first MOS tube is electrically connected with the grid electrode of the second MOS tube, and the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are both connected with the collector electrode of the first triode;
the source electrode of the second MOS tube is electrically connected with the cathode of the first diode, and the cathode of the first diode is used for outputting the actual charging current signal;
the base electrode of the first triode is electrically connected with the collector electrode of the second triode, the emitter electrode of the second triode is electrically connected with the base electrode, the base electrode of the second triode is electrically connected with the anode of the first diode, and the base electrode of the second triode is used for receiving the first driving signal.
In a second aspect, a lithium battery device is provided, which includes a lithium battery and a lithium battery protection board, where the lithium battery protection board includes any one of the above-mentioned charging isolation devices for the lithium battery protection board.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses, compare in the traditional isolation design of charging that uses the diode to keep apart, need not the machine that charges that upgrades, expanded the use scene of isolating device that charges, reduced the input cost, realized the mouth isolation protection and the excess temperature protect function that charge, effectively guaranteed battery security performance.
Drawings
Fig. 1 is a schematic structural view of a charging isolation device for a lithium battery protection plate according to embodiment 1 of the present invention;
fig. 2 is a schematic circuit structure diagram of a differential operational amplifier circuit in a charging isolation device for a lithium battery protection board according to embodiment 1 of the present invention;
fig. 3 is a schematic circuit structure diagram of an MCU in a charging isolation device for a lithium battery protection board according to embodiment 1 of the present invention;
fig. 4 is a schematic circuit structure diagram of an LDO step-down power supply circuit in a charging isolation device of a lithium battery protection board according to embodiment 1 of the present invention;
fig. 5 is a schematic circuit structure diagram of a charge control circuit in a charge isolation device for a lithium battery protection board according to embodiment 1 of the present invention;
fig. 6 is a schematic circuit structure diagram of a connection relationship between a charging control circuit and a lithium battery protection board in a charging isolation device for a lithium battery protection board according to embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a lithium battery device provided in embodiment 2 of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a charging isolation device of a lithium battery protection board, which is used for isolating a charging interface of the lithium battery protection board.
Fig. 1 is a schematic structural diagram of a charging isolation device for a lithium battery protection board according to this embodiment, and as shown in fig. 1, the charging isolation device includes a main control chip 1 and a charging control circuit 2 that are electrically connected; the charging control circuit 2 is electrically connected with a charging control pin of the lithium battery protection board 3, and the lithium battery protection board 3 is electrically connected with a charger; the main control chip 1 is used for sending a first driving signal to the charging control circuit 2 and driving a charging loop in the charging control circuit 2 to be conducted so as to charge the lithium battery; when the charging loop is conducted and is in a conducting state, the voltage signal of the charging control pin conforms to a preset voltage value; the charging control circuit 2 is also used for sending a first charging signal to the main control chip 1 after the charging loop is conducted; the main control chip 1 is further configured to drive a charging loop in the charging control circuit 2 to be closed or opened based on the first charging signal; when the first charging signal represents that the lithium battery is fully charged, the charging loop is disconnected to isolate the charging interface.
In an alternative embodiment, as shown in fig. 1, the charging isolation device further includes a power module 4; the power module 4 is electrically connected with the main control chip 1; the power module 4 is used for receiving a first power supply voltage of the charging interface and converting and outputting a first working voltage so as to supply power to the main control chip 1.
In an alternative embodiment, as shown in fig. 1, the charging isolation device further includes a charging current amplifying circuit 5; the charging current amplifying circuit 5 is respectively and electrically connected with the power module 4, the charging control circuit 2 and the main control chip 1; the power module 4 is used for supplying power to the main control chip 1 and the charging current amplifying circuit 5; the charging control circuit 2 is used for outputting an actual charging current signal to the charging current amplifying circuit 5 after the charging loop is conducted; the charging current amplifying circuit 5 is configured to amplify and convert the received actual charging current signal to obtain a first charging signal and output the first charging signal to the main control chip 1.
In an alternative embodiment, the charging current amplifying circuit 5 includes, but is not limited to, a differential operational amplifying circuit.
When the differential operational amplifier circuit is selected as the charging current amplifier circuit, the differential operational amplifier circuit comprises a first amplification power supply pin, a first amplification grounding pin, a first amplification input pin, a second amplification input pin and a first amplification output pin; the first amplification power supply pin is electrically connected with a first power output pin of the power module and used for receiving the first working voltage; the first amplification grounding pin is electrically connected with a first power grounding pin of the power module; the first amplification input pin is used for receiving an actual charging current signal; the second amplification input pin is electrically connected with a first power grounding pin of the power module; the first amplification output pin is used for outputting the first charging signal.
Fig. 2 is a schematic circuit structure diagram of a differential operational amplifier circuit in a charging isolation device of a lithium battery protection board according to the present embodiment; as shown in fig. 2, the first amplification power supply pin of the differential operational amplifier circuit corresponds to the pin a4, the first amplification ground pin corresponds to the pin A3, the first amplification input pin corresponds to the pin a1, the second amplification input pin corresponds to the pin a2, the first amplification output pin corresponds to the pin a5, and the first operating voltage is 5V; pin a4 is electrically connected to a first power output pin of the power module for receiving a 5V voltage; pin A3 is electrically connected to a first power ground pin, pin CH-, of the power module; pin a1 is used to receive the actual charging current signal I _ DET; the pin a2 is electrically connected to a pin corresponding to the first power ground pin, and is finally connected to a second ground pin CH-pin of the charging interface, and the pin a5 is used for outputting a first charging signal DET.
The pin a2 of the differential operational amplifier circuit amplifies and converts the received actual charging current signal I _ DET to obtain a first charging signal DET, and sends the first charging signal DET to the main control chip.
It should be noted that, the differential operational amplifier circuit is an existing circuit structure, and therefore, the components and connection relationships inside the differential operational amplifier circuit, and the specific principles of implementation thereof are not described herein again.
According to the charging isolation device of the lithium battery protection board, the actual charging current signal of the charging control circuit is amplified and converted through the differential operation amplification circuit, the small current signal is converted into the voltage signal, the identification of the main control chip is facilitated, and the identification precision of the main control chip on the first charging signal is improved.
In an optional embodiment, the main control chip includes, but is not limited to, an MCU.
When the MCU is selected as a main control chip, the MCU comprises a first main control power supply pin, a first main control grounding pin, a first main control signal pin and a second main control signal pin; the first master control power supply pin is electrically connected with a first power output pin of the power module and used for receiving a first working voltage; the first master control grounding pin is electrically connected with a first power supply grounding pin of the power supply module; the first master control signal pin is used for sending a first driving signal to the charging control circuit; the second master control signal pin is used for receiving the first charging signal.
Fig. 3 is a schematic circuit structure diagram of an MCU in a charging isolation device of a lithium battery protection board according to this embodiment; as shown in fig. 3, the first operating voltage is 5V, the first charging signal corresponds to the DET signal, and the first driving signal corresponds to the ON/OFF signal; the first main control power supply pin of the MCU corresponds to a pin VDD, the first main control grounding pin corresponds to a pin VSS, the first main control signal pin corresponds to a pin P01, and the second main control signal pin corresponds to a pin P02.
The pin VDD is electrically connected with a first power output pin of the power module and used for receiving 5V voltage; the pin VSS is electrically connected with a pin CH-of the power supply module; the pin P01 is used to send an ON/OFF signal to the charge control circuit and the pin P02 is used to receive the first charge signal DET.
Specifically, when the voltage signal of the charging control pin conforms to a preset voltage value, the lithium battery protection board allows the charger to charge the lithium battery, and when the charging control circuit receives the ON signal, a charging loop in the charging control circuit is conducted to charge the lithium battery. The charging control circuit sends a first charging signal DET to the main control chip after the charging loop is switched on, when the first charging signal DET represents that the lithium battery is fully charged, for example, the numerical value of DET accords with a preset value within a certain time, namely, the lithium battery is fully charged, at the moment, the main control chip sends an OFF signal to the charging control circuit, the charging loop is disconnected to isolate a charging interface, so that the effect of stopping charging is achieved, and the charging loop in the charging control circuit is driven to be closed or disconnected based on the first charging signal.
The charging isolation device of the lithium battery protection board of the embodiment controls the opening and the disconnection of the charging loop in the charging control circuit connected with the lithium battery protection board through the MCU, so that the lithium battery is controlled to be charged or stopped to be charged, and the effect of isolating the charging interface of the lithium battery protection board is achieved.
In an alternative embodiment, the power module includes, but is not limited to, an LDO buck supply circuit. The LDO step-down power supply circuit comprises a first power supply pin, a first power grounding pin and a first power output pin; the first power supply pin is electrically connected with a first charging pin of the charging interface and used for receiving a first power supply voltage; the first power supply grounding pin is electrically connected with a second charging pin of the charging interface; the first power output pin is used for outputting a first working voltage.
Fig. 4 is a schematic circuit structure diagram of an LDO buck power supply circuit in a charging isolation device of a lithium battery protection board according to this embodiment; as shown in fig. 4, the first power supply pin of the LDO step-down power supply circuit corresponds to pin VIN, the first power ground pin corresponds to pin VSS, the first power output pin corresponds to pin VOU, the first pin of the charging interface corresponds to pin CH +, and the second pin of the charging interface corresponds to pin CH-.
The pin VIN is electrically connected with a pin CH + of the charging interface and used for receiving a first power supply voltage; pin VSS is electrically connected to pin CH-and pin VOU is used to output 5V.
When the multi-string lithium batteries are connected in series, the first power supply voltage corresponding to the charging pin CH + of the lithium battery protection board is large, so that the first voltage needs to be reduced by using the LDO voltage reduction power supply circuit, and the first working voltage required by the work of the main control chip is output.
The lithium battery protection board charging isolation device of the embodiment steps down the first voltage of the lithium battery protection board through the LDO step-down power supply circuit, and then outputs the voltage required by the work of the main control chip, thereby ensuring the stability of the first working voltage and improving the working stability of the main control chip.
In an alternative embodiment, fig. 5 is a schematic circuit structure diagram of a charging control circuit in a charging isolation device of a lithium battery protection board provided in this embodiment; as shown in fig. 5, the charging control circuit includes a first MOS transistor M2, a second MOS transistor M3, a first transistor Q1, a second transistor Q2, a first diode D2, and a plurality of resistors disposed on connecting wires among the first MOS transistor, the second MOS transistor, the first transistor, the second transistor, and the first diode; the drain electrode of the second MOS tube is electrically connected with a second charging pin CH-of the charging interface through a resistor R20; the anode of the first diode is electrically connected with a second charging pin CH-of the charging interface; an emitter of the first triode is electrically connected with the charging control pin; the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube; the grid electrode of the first MOS tube is electrically connected with the grid electrode of the second MOS tube and is connected with the collector electrode of the first triode through a resistor R15; the drain electrode of the second MOS tube is electrically connected with the cathode of the first diode, and the cathode of the first diode is used for outputting an actual charging current signal I _ DET; the base of the first triode is electrically connected with the collector of the second triode through a resistor R17, the emitter of the second triode is electrically connected with the base, the base of the second triode is electrically connected with the anode of the first diode through a resistor R19, and the base of the second triode is used for receiving a first driving signal ON/OFF signal.
Specifically, when the received first driving signal is an ON signal, the first MOS transistor, the second MOS transistor, the first triode and the second triode are all switched ON to charge the lithium battery, and when the received first driving signal is an OFF signal, the first MOS transistor, the second MOS transistor, the first triode and the second triode are all switched OFF to stop charging the lithium battery.
According to the charging isolation device for the lithium battery protection board, the charging control circuit is closed or opened through the first MOS tube, the second MOS tube, the first triode and the second triode, the charging interface of the lithium battery protection board is isolated, and therefore charging or stopping charging of the lithium battery is achieved.
The following specifically describes the implementation principle of the charging isolation device for a lithium battery protection board of the present embodiment:
fig. 6 is a schematic circuit structure diagram of a connection relationship between a charging control circuit and a lithium battery protection board in a charging isolation device for a lithium battery protection board according to this embodiment.
As shown in fig. 6, when the charger is not used, the voltage of the pin CH + and the pin CH-of the charging interface of the lithium battery protection board is 0V, at this time, the power module does not work, the main control chip and the charging current amplification circuit do not work, at this time, the pin P01 of the main control chip is in a suspended state, and there is no ON/OFF signal, at this time, the triodes Q1 and Q2 in the charging control circuit are in an OFF state, the MOS transistor M2 and the MOS transistor M3 are not connected, the charging loop is disconnected, and the charging interface cannot be charged and discharged.
The charger is connected, the power supply module works and outputs 5V voltage to the main control chip and the charging current amplifying circuit, and at the moment, a P01 pin of the main control chip outputs high level to send an ON/OFF signal; meanwhile, the voltage of a detection pin VC1, a pin VC2, a pin VC3, a pin VC4 and a pin GND of the lithium battery protection board is detected, the current at two ends of a resistor R10 and a resistor R11 is detected, when the four voltages of VC1-VC2, VC 2-VC 3, VC3-VC4 and VC4-GND are all smaller than the overcharge protection voltage, and the current at two ends of a resistor R10 and a resistor R11 is smaller than the overcurrent protection value, the charge control pin CO outputs high level; the triodes Q1 and Q2 in the charging control circuit are conducted and are in a saturation state, at the moment, the MOS tube M2 and the MOS tube M3 are conducted, the charging loop is conducted, the charging of the lithium battery is started, at the moment, the charging current amplification circuit detects and amplifies the current (namely an actual charging current signal) at two ends of the resistor R20 in the charging control circuit, the current is converted into a voltage signal (namely a first charging signal) to be sent to a pin P02 of the main control chip, when the main control chip detects that the actual charging current signal lasts for 200ms and is smaller than 100mA, the pin P01 outputs a low level, the triodes Q1 and Q2 in the charging control loop are in a cut-off state, at the moment, the MOS tube M2 and the MOS tube M3 are not conducted, the charging loop is cut off, and the charging interface cannot be charged and discharged. Every 20S, the P01 pin of the main control chip resets to high level again, and the charging is turned on again and the current of the charging control circuit is detected, so that the steps are repeated.
The scaling relationship between the actual charging current signal I _ DET (current signal) and the first charging signal DET (voltage signal) is: i _ DET × R20 (1+ R33/R32) ═ DET.
The actual charging current signal lasts less than 100mA for 200ms, i.e. DET/(R20 · (1+ R33/R32)) < 100mA for 200 ms.
Lithium cell protection board can also detect the temperature of lithium cell through pin RTS pin and the cooperation of pin RTV, and pin VINI can be used for detecting charge-discharge current.
The charging and discharging parameters of the lithium battery are protected through a protection loop of a lithium battery protection board and an MOS (metal oxide semiconductor) tube in a charging control circuit, so that overcharge, overdischarge, over-temperature and charging/discharging overcurrent detection are prevented; the main control chip is powered through the LDO step-down power supply circuit; detecting the charging current I _ DET in real time by the differential operational amplifier circuit and an operational amplifier in the main control chip; the charging MOS tube M2 and the MOS tube M3 are controlled to be conducted through the main control chip and the protection circuit of the lithium battery protection board, and isolation and protection of a charging interface are achieved.
Compared with the traditional diode isolation design, the charging isolation device of the lithium battery protection board does not need to upgrade the charger, the use scene of the charging isolation device is expanded, the input cost is reduced, the functions of charging port isolation protection and over-temperature protection are realized, and the safety performance of a battery is effectively guaranteed.
Example 2
The present embodiment provides a lithium battery device, including a lithium battery and a lithium battery protection board, where the lithium battery protection board includes the charging isolation device of the lithium battery protection board described in any one of embodiments 1. Fig. 7 is a schematic structural diagram of a lithium battery device provided by this embodiment, as shown in fig. 7, the lithium battery device includes a lithium battery protection board 3, a charging isolation device of the lithium battery protection board and a lithium battery, wherein a negative electrode and a positive electrode of a first string of lithium batteries are respectively connected to a pin B-1 and a pin B11 in fig. 7, a negative electrode and a positive electrode of a second string of lithium batteries are respectively connected to a pin B11 and a pin B21, a negative electrode and a positive electrode of a third string of lithium batteries are respectively connected to a pin B21 and a pin B31, and a negative electrode and a positive electrode of a fourth string of lithium batteries are respectively connected to a pin B31 and a pin B + 1.
The charging isolation device of the lithium battery protection board comprises a main control chip 1, a charging control circuit 2, a power module 4 and a charging current amplification circuit 5, wherein the power module 4 is used for receiving a first power supply voltage of a pin CH + of a charging interface, converting and outputting a first working voltage and supplying power to the main control chip 1 and the charging current amplification circuit 5; the charging control circuit 2 is used for outputting an actual charging current signal I _ DET to the charging current amplifying circuit 5 after the charging loop is switched on; the charging current amplifying circuit 5 is configured to amplify and convert the received actual charging current signal I _ DET to obtain a first charging signal DET, and output the first charging signal DET to the main control chip 1.
The charging control circuit 2 is electrically connected with a charging control pin of the lithium battery protection board 3, the charging control pin corresponds to a pin CO in the figure 7, and the lithium battery protection board 3 is electrically connected with a charger; the main control chip 1 is used for sending a first driving signal to the charging control circuit 2 and driving a charging loop in the charging control circuit 2 to be conducted so as to charge the lithium battery; when the charging loop is conducted and is in a conducting state, a voltage signal of the charging control pin accords with a preset voltage value; the charging control circuit 2 is further configured to send a first charging signal DET to the main control chip 1 after the charging loop is turned on; the main control chip 1 is further configured to drive a charging loop in the charging control circuit 2 to be closed or opened based on the first charging signal DET; when the first charging signal DET indicates that the lithium battery is fully charged, the charging loop is disconnected to isolate the charging interface.
The lithium battery device of this embodiment, the interface that charges to the lithium battery protection board is kept apart through the isolating device that charges of lithium battery protection board, compares in traditional diode isolation design, need not to upgrade the machine that charges, has expanded the use scene of isolating device that charges, has reduced the input cost, has realized the interface isolation protection and the excess temperature protect function that charge, has realized the control to lithium battery charging process, has effectively guaranteed the battery security performance, has improved lithium battery device's security.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments can be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A charging isolation device of a lithium battery protection board is used for isolating a charging interface of the lithium battery protection board and is characterized by comprising a main control chip and a charging control circuit which are electrically connected;
the charging control circuit is electrically connected with a charging control pin of the lithium battery protection board, and the lithium battery protection board is electrically connected with a charger;
the main control chip is used for sending a first driving signal to the charging control circuit and driving a charging loop in the charging control circuit to be conducted so as to charge the lithium battery;
when the charging loop is conducted and is in a conducting state, the voltage signal of the charging control pin conforms to a preset voltage value;
the charging control circuit is also used for sending a first charging signal to the main control chip after the charging loop is conducted;
the main control chip is also used for driving the charging loop in the charging control circuit to be closed or opened based on the first charging signal;
when the first charging signal indicates that the lithium battery is fully charged, the charging loop is disconnected to isolate the charging interface.
2. The charging isolation device of claim 1, further comprising a power module;
the power supply module is electrically connected with the main control chip;
the power supply module is used for receiving the first power supply voltage of the charging interface and converting and outputting the first working voltage so as to supply power to the main control chip.
3. The charging isolation device of claim 2, further comprising a charging current amplification circuit;
the charging current amplifying circuit is electrically connected with the power supply module, the charging control circuit and the main control chip respectively;
the power supply module is used for supplying power to the main control chip and the charging current amplifying circuit;
the charging control circuit is used for outputting an actual charging current signal to the charging current amplifying circuit after the charging loop is conducted;
the charging current amplifying circuit is used for amplifying and converting the received actual charging current signal to obtain the first charging signal and outputting the first charging signal to the main control chip.
4. The charging isolation device of claim 3, wherein the charging current amplification circuit comprises a differential operational amplification circuit.
5. The charging isolation device of claim 4, wherein the differential operational amplification circuit comprises a first amplified power supply pin, a first amplified ground pin, a first amplified input pin, a second amplified input pin, and a first amplified output pin;
the first amplification power supply pin is electrically connected with a first power output pin of the power supply module and used for receiving the first working voltage;
the first amplification grounding pin is electrically connected with a first power grounding pin of the power supply module;
the first amplification input pin is used for receiving the actual charging current signal;
the second amplification input pin is electrically connected with a first power grounding pin of the power supply module;
the first amplification output pin is used for outputting the first charging signal.
6. The charging isolation device of claim 3, wherein the main control chip comprises an MCU; the MCU comprises a first master control power supply pin, a first master control grounding pin, a first master control signal pin and a second master control signal pin;
the first master control power supply pin is electrically connected with a first power output pin of the power supply module and used for receiving the first working voltage;
the first master control grounding pin is electrically connected with a first power grounding pin of the power module;
the first master control signal pin is used for sending the first driving signal to the charging control circuit;
the second master control signal pin is used for receiving the first charging signal.
7. The charge isolation device of claim 3, wherein the power module comprises an LDO buck supply circuit.
8. The charge isolation device of claim 7, wherein the LDO buck supply circuit comprises a first power supply pin, a first power ground pin, and a first power output pin;
the first power supply pin is electrically connected with a first charging pin of the charging interface and used for receiving the first power supply voltage;
the first power supply grounding pin is electrically connected with a second charging pin of the charging interface;
the first power output pin is used for outputting the first working voltage.
9. The charging isolation device of any one of claims 3-8, wherein the charging control circuit comprises a first MOS transistor, a second MOS transistor, a first transistor, a second transistor, a first diode, and a plurality of resistors disposed on the connecting wires between the first MOS transistor, the second MOS transistor, the first transistor, the second transistor, and the first diode;
the drain electrode of the second MOS tube and the anode of the first diode are electrically connected with a second charging pin of the charging interface;
an emitter of the first triode is electrically connected with the charging control pin;
the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube;
the grid electrode of the first MOS tube is electrically connected with the grid electrode of the second MOS tube, and the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are both connected with the collector electrode of the first triode;
the drain electrode of the second MOS tube is electrically connected with the cathode of the first diode, and the cathode of the first diode is used for outputting the actual charging current signal;
the base electrode of the first triode is electrically connected with the collector electrode of the second triode, the emitter electrode of the second triode is electrically connected with the base electrode, the base electrode of the second triode is electrically connected with the anode of the first diode, and the base electrode of the second triode is used for receiving the first driving signal.
10. A lithium battery device comprising a lithium battery and a lithium battery protection sheet, characterized in that the lithium battery protection sheet comprises a charge isolating means of the lithium battery protection sheet as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221409843.3U CN217445057U (en) | 2022-05-30 | 2022-05-30 | Lithium battery protection plate's isolating device and lithium battery unit that charges |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221409843.3U CN217445057U (en) | 2022-05-30 | 2022-05-30 | Lithium battery protection plate's isolating device and lithium battery unit that charges |
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| CN217445057U true CN217445057U (en) | 2022-09-16 |
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| CN202221409843.3U Active CN217445057U (en) | 2022-05-30 | 2022-05-30 | Lithium battery protection plate's isolating device and lithium battery unit that charges |
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| Country | Link |
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| CN (1) | CN217445057U (en) |
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Address after: 201414 Building 9, No. 3492 Guangming Qianqian Road, Qingcun Town, Fengxian District, Shanghai Patentee after: Shanghai Paizhi Energy Co.,Ltd. Address before: 201414 Building 9, No. 3492 Guangming Qianqian Road, Qingcun Town, Fengxian District, Shanghai Patentee before: Shanghai paizhi Energy Co.,Ltd. |