CN212380512U

CN212380512U - Structure for preventing battery of handheld station of digital interphone system from reversely leaking electricity and conducting electricity

Info

Publication number: CN212380512U
Application number: CN202021100757.5U
Authority: CN
Inventors: 粟长春; 付文良
Original assignee: Fujian Kirisun Communications Co ltd
Current assignee: Fujian Kirisun Communications Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-01-19
Anticipated expiration: 2030-06-15

Abstract

The utility model provides a structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity, wherein the battery bottom shell and the battery top shell are integrally formed into a shell through ultrasonic welding, an electric core is embedded in the shell, the positive pole of the electric core is welded to the positive pole of a charging contact piece through the upper lead of a protection plate, and the negative pole of the electric core is welded to the negative pole of the charging contact piece through the upper lead of the protection plate; the four natural-color gold-plated brass column main bodies are embedded in the plastic of the battery bottom shell and are arranged in the through holes of the charging PCB through the positioning columns, and the charging PCB is provided with an isolation circuit; the battery is controlled to be conducted by sending an instruction through an IO port of the MCU of the charger, and the IO port of the MCU of the charger sends the instruction when charging and identifying that a sampling signal is correct. The utility model discloses combine handheld platform of digital intercom, charger, battery tripartite design to guarantee battery and machine equipment safety, reach and prevent that equipment from the reverse electric leakage of end of charging and electrically conductive purpose.

Description

Structure for preventing battery of handheld station of digital interphone system from reversely leaking electricity and conducting electricity

Technical Field

The utility model belongs to the technical field of the intercom, particularly, relate to a prevent reverse electric leakage of handheld platform battery of digital intercom system and electrically conductive structure.

Background

Although the batteries of the handheld stations of the interphone systems on the market are various, although the batteries have a structure which passes the waterproof test of IP67, the batteries can not necessarily prevent reverse electric leakage and electric conduction on a circuit, particularly in a humid or even rain and snow environment, most of water and other liquids in the natural environment are conductors, although the equipment passes the test of IP67 which is waterproof, liquid substances cannot permeate into the batteries, and the batteries are simple structural parts. The battery is provided with a contact exposed outside, the positive electrode of the battery pack is connected with the positive electrode of the battery contact, and the negative electrode of the battery pack is connected with the negative electrode of the battery contact. The battery contact is gold-plated metal and is also a conductor, water or other electric conduction between the positive electrode and the negative electrode by the outside of the shell can enter the battery through the circuit to participate in battery discharge, so that the battery contact is ionized to blacken, the short circuit of equipment discharge is caused, the use and equipment safety are affected once the problem is solved, and parts of the equipment and the like cannot keep stable quality and are easy to deteriorate, so that a safety design technology for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity is urgently needed in the market, and the technology for safely applying the communication equipment of the digital interphone system to various communication scene required services in severe environments is perfected.

SUMMERY OF THE UTILITY MODEL

In order to solve the shortcomings of the prior art, the utility model aims to provide a prevent the reverse electric leakage of digital intercom system handheld station battery and electrically conductive structure to overcome the defect among the prior art.

In order to achieve the above object, the utility model provides a structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity, which comprises a battery, a charger and the handheld station of the digital interphone system; the battery comprises a battery bottom shell, a battery top shell, a battery charging plate and a battery core with a protection plate; the battery bottom shell and the battery top shell are welded into an integrated shell through ultrasonic waves, a battery core with a protection plate and a battery charging plate are embedded in the shell, and the battery charging plate is provided with a charging PCB; a discharging positive plate and a discharging negative plate are embedded on the battery bottom shell, and the battery core is electrically connected with the digital interphone system handheld station through the discharging positive plate and the discharging negative plate; the battery top shell is embedded with four charging contact pieces, the battery core is electrically connected with the charging PCB through a protection plate, and the charging PCB is electrically connected with the charger through the four charging contact pieces; a charging identification control circuit is installed on the charging PCB of the battery charging plate and controls to switch on or switch off a charging loop between the charger and the battery through a P-channel enhanced MOSFET; the battery is controlled to be conducted by sending an instruction through an IO port of the MCU of the charger, and the IO port of the MCU of the charger sends the instruction when charging and identifying that a sampling signal is correct.

Through the technical scheme, the safety of the battery and the mechanical equipment is ensured by combining the design of the handheld station of the digital interphone, the charger and the battery, the P-channel enhanced MOSFET forms an isolation circuit main body which is completely disconnected and has no leakage current to have an isolation effect, and therefore the purposes of preventing the equipment from reversely leaking electricity from a charging end and conducting electricity are achieved. The battery is matched and combined with the charger, and the battery can be identified to be not matched with the charger and can not be charged by other non-standard chargers, so that the battery is protected; the IO port controlled by the charger MCU sends out an instruction to control conduction, the conduction is carried out when the charging and the identification sampling signal is correct, and after the battery is pulled out, the charging end of the battery cannot carry out reverse discharge, so that the condition that people can not discharge and conduct electricity even in a humid environment can be met.

As right prevent the further explanation of the reverse electric leakage of digital intercom system handheld platform battery and electrically conductive structure, preferably, four the contact that charges includes battery positive charging contact, battery temperature detection contact, battery charging control discernment contact and battery negative pole charging contact, each be provided with a true qualities gilt brass post main part, each on the contact that charges the centre of true qualities gold-plated brass post main part is provided with a reference column, four the reference column sets up at the battery charging panel PCB's the downthehole that charges is used for fixing the PCB that charges, and pass through true qualities gold-plated brass post main part makes battery positive charging contact and the anodal intercommunication of electric core, battery negative pole charging contact and the negative pole intercommunication of electric core.

Through above-mentioned technical scheme, the contact that charges draws electricity to electric core in through true qualities gold plating brass post main part, and electric conductivity is better.

As a further explanation of the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity, preferably, the charger is provided with four elastic pieces, namely a negative charging elastic piece, a control recognition elastic piece, a temperature detection control elastic piece and a positive charging elastic piece, and the battery starts to charge after the four elastic pieces are in contact with the four contact pieces; the battery positive charging contact sheet is contacted with a positive charging elastic sheet of the charger and used for transmitting positive voltage; the battery charging control identification contact contacts with the control identification elastic sheet of the charger and is used for transmitting a starting voltage signal; the battery temperature detection contact piece is contacted with the temperature detection control elastic piece of the charger and used for feeding back the temperature of the battery to the MCU of the charger so as to realize high-temperature protection and low-temperature protection; the battery negative charging contact piece is contacted with a negative charging elastic piece of the charger and used for transmitting negative voltage; the charging circuit between the charger and the battery is formed by a battery positive charging contact piece, a charger positive charging elastic piece, a charger negative charging elastic piece and a battery negative charging contact piece, and the battery is charged when the control identification elastic piece of the charger acquires that the voltage and the temperature of the battery are in normal ranges.

Through the technical scheme, under the condition that the battery is inserted into the charger, the four elastic sheets of the charger are in contact with the four elastic sheets of the battery, and the temperature and the voltage information of the battery are sampled. And a starting voltage signal is transmitted to the S end of the battery, a P-channel enhanced MOSFET of an isolation circuit in the battery is conducted, and the positive voltage of the charger is transmitted to a protection plate of the battery so as to ensure that the battery is charged when the voltage and the temperature of the battery are in a normal range, thereby achieving the purposes of preventing the reverse electric leakage of the equipment from a charging end and conducting electricity.

As right prevent that handheld platform battery of digital intercom system from backward leaking electricity and further explanation of electrically conductive structure, preferably, be provided with electric core positive pole pad and electric core negative pole pad on the PCB that charges, the anodal last lead wire that passes through the protection shield of electric core welds to on the electric core positive pole pad, the last lead wire that the negative pole of electric core passes through the protection shield welds to on the electric core negative pole pad.

As right prevent the reverse electric leakage of handheld platform battery of digital intercom system and further explanation of electrically conductive structure, preferably, the handheld bench of digital intercom system is provided with discharge positive plate and discharge negative plate assorted intercom positive pole shell fragment and intercom negative pole shell fragment, the battery with the seamless butt joint of handheld platform of digital intercom system forms a whole to make discharge positive plate with the anodal shell fragment of intercom contacts, discharge negative plate with intercom negative pole shell fragment contacts.

Through the technical scheme, the battery shape accords with and matches the host machine of the handheld station of the digital interphone system for seamless butt joint, the handheld station of the interphone is integrally formed, no gap exists between the handheld station of the interphone and the outside of the handheld station of the interphone, and the electricity supply of the battery core to the interphone is realized through the discharging positive plate and the discharging negative plate.

As a further description of the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity of the present invention, preferably, the control circuit of the protection board comprises a protection IC and a first MOSFET tube; the VDD pin of the protection IC is sequentially connected with a first inductor and a first resistor, the first inductor and the first resistor are grounded through a second capacitor, and the first resistor is respectively connected with the anode of the battery cell and the anode of the charger; a VBL pin of the protection IC is respectively connected with a first capacitor and a second resistor, and the second resistor is connected with a voltage monitoring input pin of the charger; a VSS pin of the protection IC is connected with a second inductor, and the second inductor is respectively connected with a first capacitor, a cathode of a battery cell and a first MOSFET; the DOUT pin of the protection IC is sequentially connected with the third inductor and the first MOSFET; the COUT pin of the protection IC is sequentially connected with the fourth inductor and the first MOSFET; a V-pin of the protection IC is sequentially connected with a fifth inductor, a third resistor and a first MOSFET, and the first MOSFET is connected with the cathode of the battery cell; and a third capacitor and a fourth capacitor are connected in parallel between the positive electrode of the battery cell and the negative electrode of the battery cell.

Through the technical scheme, the control circuit of the protection plate mainly controls the negative pole to realize, the battery is guaranteed not to be charged by overvoltage, the fire hazard is avoided, the circuit is turned off when the short circuit occurs, the P + and the P-have no voltage and current, and the turning off function is realized when the large current is discharged, so that the functions of over-charging/over-discharging/over-current/short circuit are realized.

As a further explanation of the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity according to the present invention, preferably, when the protection IC detects that the voltage is greater than the overcharge protection voltage thereof, the COUT pin of the protection IC receives the overcharge protection signal, and then the COUT pin is switched from the high level to the low level, and the COUT pin controls the first MOSFET tube to be closed; when the protection IC detects that the voltage is smaller than the overcharge protection voltage, the DOUT pin of the protection IC receives a signal of overcharge protection, the DOUT pin is switched from high level to low level, and the DOUT pin controls the first MOSFET to be closed; the protection IC checks that the VSS pin is used as a reference ground, the V-pin is used as a negative terminal input pin of the charger, the protection IC checks that the voltage is smaller than the voltage difference generated on the first MOSFET, the DOUT pin of the protection IC receives a signal of over-discharge current protection, the output of the DOUT pin is converted into low level output, and the DOUT pin controls the first MOSFET to be closed.

Through the technical scheme, the control circuit of the protection board mainly controls the negative pole to realize the functions of overcharge, overdischarge, overcurrent and short circuit.

As a further description of the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity of the present invention, preferably, the charging identification control circuit includes a first magnetic bead, a second MOSFET tube, a thermistor pad and a second magnetic bead; the battery positive charging contact is sequentially connected with the first magnetic bead and the field effect tube, the field effect tube is respectively connected with the positive electrode of the battery cell, a fourth resistor and a fifth resistor, the fourth resistor is connected with the fifth resistor, and the fifth resistor is connected with the second MOSFET tube; the battery temperature detection contact plate is connected with the thermistor bonding pad, and the thermistor bonding pad is respectively connected with the cathode of the battery cell and the second magnetic bead; the battery charging control recognition contact is connected with a sixth resistor, the sixth resistor is respectively connected with a second MOSFET (metal oxide semiconductor field effect transistor) tube and a ninth capacitor, the second MOSFET tube is respectively connected with the cathode of the battery cell and the second magnetic bead, and the ninth capacitor is respectively connected with the cathode of the battery cell and the second magnetic bead; the battery negative pole charging contact piece is connected with the second magnetic bead, and the second magnetic bead is connected with the negative pole of electric core.

As right the utility model discloses a prevent the reverse electric leakage of handheld platform battery of digital intercom system and further explanation of electrically conductive structure, preferably, the diameter of true qualities gilding brass post main part is 4mm, and thickness is 0.8 mm.

As a further explanation of the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity, preferably, the height of the positioning column is 1.7mm, and the diameter is 1.0 mm.

The utility model has the advantages that: the utility model discloses combine handheld platform of digital intercom, charger, battery tripartite relevance design to guarantee battery and machine equipment safety to reach and prevent that equipment from the reverse electric leakage of end of charging and electrically conductive purpose. The battery shape conforms to and matches the host of the handheld station of the digital interphone system for seamless butt joint, so that the whole handheld station of the interphone is formed, and no gap exists outside the whole handheld station; the battery is matched and combined with the charger, and the battery can be identified to be not matched with the charger and can not be charged by other non-standard chargers, so that the battery is protected; the IO mouth that is controlled by charger MCU sends command control and switches on, just switches on when charging and discernment sampling signal are correct, and the back is pulled out to the battery, and the battery end of charging can not reverse discharge, can satisfy people when using, even can not discharge and electrically conduct under humid environment, has passed through military industry waterproof test case rain test, salt fog corrosion test case salt fog test, the high temperature damp and hot test of constant temperature and humidity case of U.S. military standard.

Drawings

Fig. 1 is a schematic structural view of a battery top case side of the battery of the present invention.

Fig. 2 is a schematic structural diagram of the battery bottom case side and the digital interphone system handheld station of the present invention.

Fig. 3 is a perspective view of one side of a battery bottom case of the battery of the present invention.

Fig. 4 is a circuit diagram of the protection board of the present invention.

Fig. 5 is a circuit diagram of the charging identification control circuit of the present invention.

Fig. 6 is a block diagram of the charging process of the battery and the charger of the present invention.

Detailed Description

In order to further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.

Firstly, as shown in fig. 1-3, the structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity of the utility model comprises a battery, a charger and the handheld station of the digital interphone system; the battery comprises a battery bottom shell 1, a battery top shell 2, a battery charging plate 3 and a battery core 4 with a protection plate 5. The battery bottom shell 1 and the battery top shell 2 are welded into a whole through ultrasonic waves to form a shell, and waterproof glue protection needs to be added on the periphery of ultrasonic wave lines to achieve double waterproof effects. A battery core 4 with a protection plate 5 and a battery charging plate 3 are embedded in the shell, and a charging PCB is arranged on the battery charging plate 3; the battery charging PCB is provided with a battery cell positive electrode bonding pad and a battery cell negative electrode bonding pad, the positive electrode of the battery cell 4 is welded on the battery cell positive electrode bonding pad through an upper lead of the protection plate 5, and the negative electrode of the battery cell 4 is welded on the battery cell negative electrode bonding pad through an upper lead of the protection plate 5, so that a structure that the battery cell 4 is electrically connected with the battery charging PCB through the protection plate 5 is formed.

As shown in fig. 1 and 3, four charging contacts are embedded on the battery top shell 2 and comprise a battery positive charging contact 8, a battery temperature detection contact 9, a battery charging control identification contact 10 and a battery negative charging contact 11, each charging contact is provided with a natural-color gold-plated brass column main body, each natural-color gold-plated brass column main body is provided with a positioning column and four positioning columns, the positioning columns are arranged in through holes of the battery charging board 3 of the charging PCB and used for fixing the charging PCB, and the battery positive charging contact 8 is communicated with the positive electrode of the battery core 4 through the natural-color gold-plated brass column main body, and the battery negative charging contact 11 is communicated with the negative electrode of the battery core 4 to form four structures electrically connecting the charging contacts with the battery core 4 through the charging PCB. Preferably, the diameter of the body of the natural-color gold-plated brass cylinder is 4mm, and the thickness is 0.8 mm. The height of reference column is 1.7mm, and the diameter is 1.0 mm.

Four true qualities gold-plated brass post main parts are inlayed in battery drain pan 1's plastic, will charge the PCB board and put and make each on battery drain pan 1 the reference column in the middle of the true qualities gold-plated brass post main part on the contact that charges aligns the via hole of the PCB board that charges, with 4 pads (including electric core positive pole pad with electric core negative pole pad) use the flatiron to weld tin, the last discernment control circuit that charges of installing of charging PCB, the discernment control circuit that charges switches on or breaks through P channel enhancement mode MOSFET control the charger with charging circuit between the battery, the battery passes through the IO port of the MCU of charger sends command control and switches on, the IO port of the MCU of charger is charging and discernment sampling signal is right time give-out the instruction, realizes charging, and the battery positive and negative pole is to the charger positive negative pole after can not charge. Therefore, when the positive electrode and the negative electrode of the charging contact piece exposed outside are connected by water or other conduction outside the shell, the P-channel enhancement type MOSFET is not connected with the charger, and the P-channel enhancement type MOSFET is kept in the cut-off state, so that a power supply forming circuit is not formed to participate in discharging. On the basis that the handheld station and the battery of the digital interphone system are designed through IP67 which is physically waterproof, the aim of preventing the equipment from reversely leaking electricity from the charging end and conducting electricity is fulfilled by adding the design of the non-conductivity of the charging end of the battery with energy in water, namely the design of the reverse electricity-leakage-free conductive circuit of the battery.

As shown in fig. 5, the charge identification control circuit includes a first magnetic bead FB1, a second MOSFET tube Q1, a thermistor pad 14, and a second magnetic bead FB 2; the battery positive charging contact 8 is sequentially connected with the first magnetic bead FB1 and the field-effect tube Q2, the field-effect tube Q2 is respectively connected with the positive electrode of the battery cell 4, the fourth resistor R4 and the fifth resistor R5, the fourth resistor R4 is connected with the fifth resistor R5, and the fifth resistor R5 is connected with the second MOSFET Q1; the battery temperature detection contact plate 9 is connected with the thermistor bonding pad 14, and the thermistor bonding pad 14 is respectively connected with the negative electrode of the battery core 4 and the second magnetic bead FB 2; the battery charging control identification contact 10 is connected with a sixth resistor R6, the sixth resistor R6 is respectively connected with a second MOSFET tube Q1 and a ninth capacitor C9, the second MOSFET tube Q1 is respectively connected with the cathode of the battery cell 4 and a second magnetic bead FB2, and the ninth capacitor C9 is respectively connected with the cathode of the battery cell 4 and the second magnetic bead FB 2; the battery negative electrode charging contact 11 is connected with the second magnetic bead FB2, and the second magnetic bead FB2 is connected with the negative electrode of the battery core 4.

The charger is provided with four elastic pieces, namely a negative charging elastic piece, a control identification elastic piece, a temperature detection control elastic piece and a positive charging elastic piece, and the battery starts to charge after the four charging elastic pieces are contacted with the four elastic pieces; the battery positive charging contact 8 is in contact with a positive charging elastic sheet of the charger and is used for transmitting positive voltage; the battery temperature detection contact piece 9 is contacted with a temperature detection control elastic piece of the charger and used for feeding back the temperature of the battery to the MCU of the charger so as to realize high-temperature protection and low-temperature protection; the battery charging control identification contact 10 contacts the control identification elastic sheet of the charger and is used for transmitting a starting voltage signal; the battery negative charging contact plate 11 is contacted with a negative charging elastic sheet of the charger and used for transmitting negative voltage; so as to form a structure that the charging PCB is electrically connected with the charger through the four charging contact pieces. The battery positive charging contact 8, the positive charging elastic sheet of the charger, the negative charging elastic sheet of the charger and the battery negative charging contact 11 form a charging loop between the charger and the battery, and the control identification elastic sheet of the charger charges the battery when acquiring that the voltage and the temperature of the battery are in normal ranges.

As shown in fig. 2, the digital interphone system hand-held station and the matched battery assembly drawing, the left side is the interphone, the right side is the battery bottom shell side of the battery, the battery bottom shell 1 is embedded with the discharging positive plate 6 and the discharging negative plate 7, the digital interphone system hand-held station is provided with the interphone positive spring plate 12 and the interphone negative spring plate 13 which are matched with the discharging positive plate 6 and the discharging negative plate 7, the battery and the digital interphone system hand-held station are in seamless butt joint to form a whole, so that the discharging positive plate 6 is contacted with the interphone positive spring plate 12, the discharging negative plate 7 is contacted with the interphone negative spring plate 13, the battery cell 4 is electrically connected with the digital interphone system hand-held station through the discharging positive plate 6 and the discharging negative plate 7, and the battery cell supplies power to the interphone through the discharging positive plate and the discharging negative plate, the battery shape conforms to and matches the digital interphone system hand-held station host in seamless butt joint, the whole interphone handhold station is formed, and the whole interphone has no gap structure to the outside.

The main charging circuit of the battery by the abnormal charger is disconnected, and the switch of the charging anode charging circuit is supported by a P-channel enhancement type MOSFET, namely a second MOSFET Q1. The PMOS transistor has a characteristic that a current is not required for the MOS transistor to be turned on, as long as Vgs is lower than a predetermined value, as compared with a bipolar transistor. The low voltage is generated by a charging control charging on-off unit, and before the base charging is not connected to obtain an instruction sent by the MCU, the MOSFET in the battery cannot generate level change or maintain the original high level state. This level comes from the voltage of the cell. In the state that the battery is inserted into the charger, four spring plates of the charger are in contact with four charging contact plates of the battery, and the temperature and voltage information of the battery are sampled. And transmitting a starting voltage signal to the S end of the battery, starting the NMOSFET of the charging control module to drive the NMOSFET to be conducted, pulling down the original high level and outputting the low level. This low level drives the charge positive charge circuit switch P channel enhancement MOSFET on and the positive voltage of the seat charge is delivered to the battery's protection plate 11.

As shown in fig. 4, the control circuit of the protection panel 5 includes a protection ICU1 and a first MOSFET tube U2; the VDD pin of the protection ICU1 is sequentially connected with a first inductor L1 and a first resistor R1, the first inductor L1 and the first resistor R1 are grounded through a second capacitor C2, and a first resistor R1 is respectively connected with the anode of the battery cell 4 and the anode of the charger; a VBL pin of the protection ICU1 is respectively connected with a first capacitor C1 and a second resistor R2, and a second resistor R2 is connected with a voltage monitoring input pin of the charger; a VSS pin of the protection ICU1 is connected with a second inductor L2, and the second inductor L2 is respectively connected with a first capacitor C1, the cathode of the battery cell 4 and a first MOSFET tube U2; the DOUT pin of the protection ICU1 is sequentially connected with a third inductor L3 and a first MOSFET U2; a COUT pin of the protection ICU1 is sequentially connected with a fourth inductor L4 and a first MOSFET U2; a V-pin of the protection ICU1 is sequentially connected with a fifth inductor L5, a third resistor R3 and a first MOSFET U2, and the first MOSFET U2 is connected with the negative electrode of the battery cell 4; a third capacitor C3 and a fourth capacitor C4 are connected in parallel between the positive electrode of the battery cell 4 and the negative electrode of the battery cell 4. In fig. 4, the DOUT pin of the protection ICU1 is used as an output pin (CMOS output) for overdischarge detection and protection, the COUT pin of the protection ICU1 is used as an output pin (CMOS output) for overcharge detection and protection, the VBL pin of the protection ICU1 is connected to a monitoring input pin for intermediate voltage of two batteries connected in series, the VSS pin of the protection ICU1 is used as a ground pin of the protection IC, and the VDD pin of the protection ICU1 is used as a power supply voltage pin, so as to provide a power supply for the protection IC.

Table 1 shows the pin definitions of the first MOSFET U2 (see fig. 4):

foot position	Description of the symbols	Description of the invention
			B1	D1	Drain D1
B2	S1	Source S1
			B3	S1	Source S1
B4	G1	Gate G1
			B5	G2	Gate G2
B6	S2	Source S2
			B7	S2	Source S2
B8	D2	Drain D2

TABLE 1

A MOS FET may be considered as a special switch in an electronic circuit. When the grid G obtains a high level, the switch is closed; current passes between D, S. When gate G gets a low level instead of a high level, the switch between D, S is seen as an open circuit and current cannot pass.

The control circuit of the protection board 5 mainly controls the negative electrode to realize the overcharge/overdischarge/overcurrent/short circuit function. When the protection IC U1 detects that the voltage is greater than the overcharge protection voltage, the COUT pin of the protection IC U1 receives the overcharge protection signal, the COUT pin is switched from high level to low level, and the COUT pin controls the first MOSFET U2 to be closed; when the protection IC U1 detects that the voltage is smaller than the overcharge protection voltage, the DOUT pin of the protection IC U1 receives the overcharge protection signal, the DOUT pin is switched from high level to low level, and the DOUT pin controls the first MOSFET U2 to be closed; the protection IC U1 checks that the VSS pin is used as a reference ground, the V-pin is used as a negative terminal input pin of the charger, the protection IC U1 checks that the voltage is smaller than the voltage difference generated on the first MOSFET U2, the DOUT pin of the protection IC U1 receives an over-discharge current protection signal, the output of the DOUT pin is converted into low-level output, and the DOUT pin controls the first MOSFET U2 to be closed.

During charging, the protection IC U1 continuously measures the battery through the VDD pin and the first resistor R1, and if overcharge is detected in a certain battery, when the battery voltage is detected to be charged to 8.4V (the voltage varies with different ICs), the overcharge detection circuit in the protection IC U1 will detect this signal and convert it into a series of level signals, one of which is sent to the COUT pin at the output terminal, causing the B4 pin of the first MOSFET U2 to turn off, thereby terminating the charging, even if the other battery is detected to be over-discharged or short-circuited, and the COUT pin output will remain "low" due to the overcharge protection mechanism being dominant. If a battery detects overdischarge, the output of the DOUT pin is lowered, if a charger is connected to the battery pack at the moment and the other battery detects overcharge, the internal counter is started, and after the overdischarge release delay time, the DOUT pin is raised, and the normal charging and discharging state is maintained.

While discharging, the over-discharge detection circuit in the protection IC U1 continuously measures the voltage across the battery, and when the battery voltage drops to 6.0V with the increase of the power consumption time (the voltage value varies with different ICs), the detection circuit outputs a signal to make the pin of the output terminal DOUT low, so that the MOS FET of the first MOSFET U2 is turned off to terminate the battery discharge.

Under a special condition, if the current is greater than a rated value when the battery is discharged, the overcurrent detector in the protection IC U1 outputs a low level signal to the DOUT pin, so that the first MOSFET U2 is turned off within a time of 5-15 ms (this value varies with different currents and different internal resistances of the MOS transistors).

Therefore, the control circuit of the protection board 5 ensures that the battery cannot be charged by overvoltage, avoids fire hazard, plays a role in switching off the circuit in short circuit, and has no voltage and current in P + and P-, and plays a role in switching off when large current is discharged.

As shown in fig. 5, the voltage/temperature sampling of the square-frame battery is that the voltage of the battery to be charged is detected in the process of charging the positive and negative electrodes of the battery by the positive and negative electrode shrapnels of the charger, and when the battery is judged to be in a normal range in which the battery can be charged, the charging condition is satisfied: if the battery is between 6.0V and 8.4V, the temperature of the battery is detected to be between 0 ℃ and 47 ℃ normally. Charging can be performed when both conditions are satisfied.

The temperature, voltage, current and whether there is battery are transmitted back to the charger through four spring plates. Charging and identification only occur with the matching charger, and no charging action occurs with the other charger in order to protect the battery. The charging path of the battery is only switched on when in contact with the charger. When the battery is separated from the charger, the charging action and the discharging action of the charging end can not occur, so that the purposes of preventing the battery from reversely leaking electricity and conducting electricity from the charging end are achieved.

The overcharge/overdischarge/overcurrent/protection of the square frame protection board is the function of the combination of the battery core and the battery protection board.

Those not described in detail in this specification are within the skill of the art.

The current of a battery charging plate before improvement is prevented from being discharged reversely by serially connecting diodes in a charging line, generally 1N4001-1N4007 or other diodes, and the reverse current cannot be discharged in a short-time 24-hour or longer damp-heat soaking under normal conditions, but in a long-time damp-heat soaking for more than 10 days, for example, reverse current leakage of the uA level exists.

The utility model discloses combine handheld platform of digital intercom, seat to fill, battery tripartite relevance design assurance battery and mechanical equipment safety to reach and prevent that equipment from filling the reverse electric leakage of end and electrically conductive purpose. The test result is passed through a rain test of a military waterproof test box, a salt spray test of a salt spray corrosion test box and a high-temperature damp-heat test of a constant-temperature constant-humidity box of the American military standard.

It should be noted that the above mentioned embodiments and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims

1. A structure for preventing a battery of a handheld station of a digital interphone system from reversely leaking electricity and conducting electricity is characterized by comprising a battery, a charger and the handheld station of the digital interphone system; wherein the content of the first and second substances,

the battery comprises a battery bottom shell (1), a battery top shell (2), a battery charging plate (3) and a battery core (4) with a protection plate (5); wherein the content of the first and second substances,

the battery top shell and the battery bottom shell (1) are integrally welded into a shell through ultrasonic waves, a battery core (4) with a protection plate (5) and a battery charging plate (3) are embedded in the shell, and the battery charging plate (3) is provided with a charging PCB;

a discharging positive plate (6) and a discharging negative plate (7) are embedded on the battery bottom shell (1), and the battery core (4) is electrically connected with the digital interphone system handheld platform through the discharging positive plate (6) and the discharging negative plate (7);

four charging contact pieces are embedded on the battery top shell (2), the battery core (4) is electrically connected with the charging PCB through a protection plate (5), and the charging PCB is electrically connected with the charger through the four charging contact pieces;

a charging identification control circuit is arranged on the charging PCB of the battery charging plate (3), and the charging identification control circuit controls to switch on or switch off a charging loop between the charger and the battery through a P-channel enhanced MOSFET;

the battery is controlled to be conducted by sending an instruction through an IO port of the MCU of the charger, and the IO port of the MCU of the charger sends the instruction when charging and identifying that a sampling signal is correct.

2. The structure for preventing the battery of the handheld platform of the digital interphone system from reversely leaking electricity and conducting electricity as claimed in claim 1, wherein the four charging contacts comprise a positive charging contact (8), a temperature detecting contact (9), a charging control identifying contact (10) and a negative charging contact (11), each charging contact is provided with a gold plated brass column body, a positioning column is arranged in the middle of each gold plated brass column body, the four positioning columns are arranged in the through holes of the charging PCB of the battery charging board (3) for fixing the charging PCB, the positive charging contact (8) is communicated with the positive electrode of the battery core (4) through the gold plated brass column body, and the negative charging contact (11) is communicated with the negative electrode of the battery core (4).

3. The structure for preventing the battery of the handheld station of the digital interphone system from reversely leaking electricity and conducting electricity as claimed in claim 2, wherein the charger is provided with four spring pieces of a negative charging spring piece, a control recognition spring piece, a temperature detection control spring piece and a positive charging spring piece, and the battery starts to charge after the four spring pieces are contacted with the four spring pieces;

wherein, the battery positive charging contact piece (8) contacts with the positive charging spring piece of the charger and is used for transmitting positive voltage; the battery temperature detection contact piece (9) is in contact with a temperature detection control elastic piece of the charger and is used for feeding back the temperature of the battery to the MCU of the charger so as to realize high-temperature protection and low-temperature protection; the battery charging control identification contact piece (10) is contacted with the control identification elastic piece of the charger and is used for transmitting a starting voltage signal; the battery negative charging contact piece (11) is contacted with a negative charging elastic piece of the charger and used for transmitting negative voltage;

the charging circuit between the charger and the battery is formed by a battery positive charging contact piece (8), a positive charging elastic piece of the charger, a negative charging elastic piece of the charger and a battery negative charging contact piece (11), and the battery is charged when the control identification elastic piece of the charger acquires that the voltage and the temperature of the battery are in a normal range.

4. The structure for preventing the battery of the handheld station of the digital interphone system from leaking electricity reversely and conducting electricity as set forth in claim 1, wherein the charging PCB is provided with a cell positive pad and a cell negative pad, the positive pole of the cell (4) is welded to the cell positive pad through the upper lead of the protection plate (5), and the negative pole of the cell (4) is welded to the cell negative pad through the upper lead of the protection plate (5).

5. The structure for preventing the battery of the handheld station of the digital interphone system from leaking electricity and conducting electricity reversely as claimed in claim 1, wherein the handheld station of the digital interphone system is provided with the interphone positive elastic piece (12) and the interphone negative elastic piece (13) matching with the discharging positive piece (6) and the discharging negative piece (7), the battery and the handheld station of the digital interphone system are seamlessly butted to form a whole, so that the discharging positive piece (6) contacts with the interphone positive elastic piece (12), and the discharging negative piece (7) contacts with the interphone negative elastic piece (13).

6. The structure for preventing reverse leakage and conduction of a battery of a digital interphone system as claimed in claim 1 is characterized in that the control circuit of the protection board (5) comprises a protection IC (U1) and a first MOSFET tube (U2); the VDD pin of the protection IC (U1) is sequentially connected with a first inductor (L1) and a first resistor (R1), the first inductor (L1) and the first resistor (R1) are grounded through a second capacitor (C2), and the first resistor (R1) is respectively connected with the anode of the battery cell (4) and the anode of the charger; a VBL pin of a protection IC (U1) is respectively connected with a first capacitor (C1) and a second resistor (R2), and the second resistor (R2) is connected with a voltage monitoring input pin of the charger; a VSS pin of the protection IC (U1) is connected with a second inductor (L2), and the second inductor (L2) is respectively connected with a first capacitor (C1), the negative electrode of the battery cell (4) and the first MOSFET (U2); the DOUT pin of the protection IC (U1) is sequentially connected with the third inductor (L3) and the first MOSFET (U2); the COUT pin of the protection IC (U1) is sequentially connected with the fourth inductor (L4) and the first MOSFET (U2); a V-pin of the protection IC (U1) is sequentially connected with a fifth inductor (L5), a third resistor (R3) and a first MOSFET (metal-oxide-semiconductor field effect transistor) (U2), and the first MOSFET (U2) is connected with the negative electrode of the battery cell (4); and a third capacitor (C3) and a fourth capacitor (C4) are connected in parallel between the positive electrode of the battery cell (4) and the negative electrode of the battery cell (4).

7. The structure for preventing reverse leakage and conduction of a battery of a handset of a digital interphone system as recited in claim 6, wherein,

when the protection IC (U1) detects that the voltage is greater than the overcharge protection voltage, the COUT pin of the protection IC (U1) receives a signal of overcharge protection, the COUT pin is switched from high level to low level, and the COUT pin controls the first MOSFET (U2) to be closed;

when the protection IC (U1) detects that the voltage is smaller than the overcharge protection voltage, the DOUT pin of the protection IC (U1) receives a signal of overcharge protection, the DOUT pin is switched from high level to low level, and the DOUT pin controls the first MOSFET (U2) to be closed;

the protection IC (U1) checks that the VSS pin is used as a reference ground, the V-pin is used as a negative terminal input pin of the charger, the protection IC (U1) checks that the voltage is smaller than the voltage difference generated on the first MOSFET (U2), the DOUT pin of the protection IC (U1) receives a signal of over-discharge current protection, the output of the DOUT pin is converted into low level output, and the DOUT pin controls the first MOSFET (U2) to be turned off.

8. The structure for preventing reverse leakage and conduction of a battery in a handset of a digital interphone system as claimed in claim 2, wherein said charge recognition control circuit comprises a first magnetic bead (FB1), a second MOSFET tube (Q1), a thermistor pad (14) and a second magnetic bead (FB 2); the battery anode charging contact (8) is sequentially connected with the first magnetic bead (FB1) and the field-effect tube (Q2), the field-effect tube (Q2) is respectively connected with the anode of the battery cell (4), the fourth resistor (R4) and the fifth resistor (R5), the fourth resistor (R4) is connected with the fifth resistor (R5), and the fifth resistor (R5) is connected with the second MOSFET (Q1); the battery temperature detection contact (9) is connected with the thermistor bonding pad (14), and the thermistor bonding pad (14) is respectively connected with the negative electrode of the battery core (4) and the second magnetic bead (FB 2); the battery charging control identification contact (10) is connected with a sixth resistor (R6), the sixth resistor (R6) is respectively connected with a second MOSFET (Q1) and a ninth capacitor (C9), the second MOSFET (Q1) is respectively connected with the cathode of the battery cell (4) and a second magnetic bead (FB2), and the ninth capacitor (C9) is respectively connected with the cathode of the battery cell (4) and the second magnetic bead (FB 2); the battery negative electrode charging contact piece (11) is connected with a second magnetic bead (FB2), and the second magnetic bead (FB2) is connected with the negative electrode of the battery core (4).

9. The structure for preventing reverse leakage and conduction of a battery of a handheld station of a digital interphone system as claimed in claim 2, wherein the diameter of the body of the unbleached gold plated brass cylinder is 4mm and the thickness is 0.8 mm.

10. The structure for preventing reverse leakage and conduction of a battery of a handheld station of a digital interphone system as claimed in claim 2 is characterized in that the height of the positioning column is 1.7mm and the diameter is 1.0 mm.