CN201478415U

CN201478415U - Waterproof mobile phone battery

Info

Publication number: CN201478415U
Application number: CN200920307108XU
Authority: CN
Inventors: 贝林杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-30
Filing date: 2009-07-30
Publication date: 2010-05-19
Anticipated expiration: 2019-07-30

Abstract

The utility model provides a waterproof mobile phone battery. A humidity sensor is mounted on a battery shell; a switch triode and a battery protection integrated circuit are connected to the output end of the battery; the switch triode is controlled by the humidity sensor; the source electrodes of two metal oxide-type semi-conductor field-effect transistors are connected in series to the output return circuit of the cathode of the battery; the source electrodes and the drain electrodes of the semi-conductor field-effect transistors are arranged in a reversed manner; one diode is connected to each of the source electrodes and the drain electrodes of the semi-conductor field-effect transistors; the grid electrode of one of the semi-conductor field-effect transistors is connected to the charging control end of the battery protection integrated circuit; the grid electrode of the other semi-conductor field-effect transistor is connected with the discharging control end of the battery protection integrated circuit; and the output end of the switch triode is connected with the grid electrode and the drain electrode of the semi-conductor field-effect transistor which is connected to the discharging return circuit. Compared with the prior art, the battery not only can conduct constant-current constant-voltage charging on a lithium ion battery, but also has the characteristics of simple structure and reliable operation.

Description

The waterproof mobile phone battery

Technical field

The utility model relates to mobile phone and uses the battery technology field, especially a kind of battery with humidity or water inlet defencive function.

Background technology

In the prior art, the battery that mobile phone uses does not have water-proof function, and when mobile phone was intake accidentally, the current supply circuit of battery can automatic disconnection, and mobile phone is still in running order, and this situation causes mobile phone to damage easily.In the prior art, Chinese patent " a kind of waterproof mobile phone battery " is arranged, and (patent No. is 200320117860.0, Granted publication day is on May 25th, 2005), this technical scheme is to be connected to a control integrated circuit and a switch integrated circuit at the battery output, input in control integrated circuit is connected to a MOS field-effect transistor, between the grid of MOS field-effect transistor and anode, be connected to electrode as the narrow slit structure of humistor, switching signal input control integrated circuit by the MOS field-effect transistor, and the output control switch integrated circuit by control integrated circuit, the break-make of switch integrated circuit battery cathode.This technical scheme can not provide constant-current constant-voltage charging to lithium ion battery owing to the negative pole with battery directly is connected with load end.Another prior art is Chinese patent " an electronics waterproof mobile phone ", (patent No. is 200320116487.7, Granted publication day is on December 29th, 2004), this technical scheme is: comprise circuit board of mobile phone, field effect transistor, bistable circuit, water circuits for triggering and reset circuit, field effect transistor, bistable circuit, water circuits for triggering and reset circuit are contained on the circuit board of mobile phone, the source electrode of field effect transistor is as the input of battery, the drain electrode of field effect transistor is as the feeder ear of mobile phone circuit, the grid of the control termination field effect transistor of bistable circuit, the trigger end water receiving circuits for triggering of bistable circuit, reset circuit connects the drain electrode of field effect transistor or the control end of bistable circuit.This technical scheme structure is complicated, and manufacturing cost is higher.

The utility model content

Problem to be solved in the utility model provides a kind ofly can carry out constant-current constant-voltage charging to lithium ion battery, and has the into waterproof mobile phone battery of water safeguard function.

For addressing the above problem, this waterproof mobile phone battery includes housing and is encapsulated in the interior battery core body of this housing,

On described housing, humidity sensor is installed, output at described battery core body is connected to a battery protection integrated circuit, field effect transistor and the field effect transistor as discharge switch as charge switch is arranged, the drain electrode of these two field effect transistor is joined in the negative pole output loop that is connected on described battery core body, the source electrode of these two field effect transistor and drain electrode all are connected to fast recovery diode, the grid of described field effect transistor as charge switch is connected on the charging control end of described battery protection integrated circuit, and another grid as the field effect transistor of discharge switch is connected on the discharge control end of described battery protection integrated circuit; Have an input to be connected to the switch triode of described humidity sensor, the output of this switch triode connects the grid and the source electrode of described semiconductor field as discharge switch.

In the such scheme, the model of described battery protection integrated circuit can be any of S-8211C or S-8211D or S-8241 or S-8261 or SL1051 or CN3052 or DW01; Described humidity sensor can be made of a pair of close electrode mutually.

Owing to adopted such scheme, the utility model compared with prior art: the one, can carry out constant-current constant-voltage charging to lithium ion battery, the 2nd, circuit structure is comparatively simple, moves very reliable.

Description of drawings

Fig. 1 is the external structure schematic diagram of the utility model embodiment.

Fig. 2 is the circuit theory diagrams of the utility model embodiment.

Embodiment

Below in conjunction with the accompanying drawing example the utility model is specified:

Among Fig. 1, be packaged with battery in the housing 2 of battery, post the humidity sensor 1 that the electrode by a pair of narrow slit structure constitutes on the housing 2 of battery, the electrode of humidity sensor 1 presents high-ohmic when drying, and when humidity or submergence have water, be low resistance characteristic.In the housing 2 of battery, also be coated with the circuit board of battery protection controller.

Figure 2 shows that the electrical schematic diagram of the circuit board of battery protection controller; this waterproof mobile phone battery protection controller is by resistance R 1 Hope 5; capacitor C 1; C2; triode Q3; source electrode and drain electrode all are connected to the metal oxide semiconductor field effect tube Q1 of fast recovery diode; Q2; humidity sensor W1 (being the humidity sensor 1 among Fig. 1) and model are that the battery protection integrated circuit U1 (can be S-8211C or S-8211D or S-8241 or S-8261 or SL1051 or the replacement of CN3052 integrated circuit with model in other embodiments) of DW01 is connected into; wherein field effect transistor Q2 is as charge switch usefulness, and field effect transistor Q1 uses as discharge switch.

Battery core body B1 is by resistance R 1, capacitor C 1 provides vdd terminal from power supply to battery protection integrated circuit U1 and VSS end, battery protection integrated circuit U1 has the discharge control end OD and the charging control end OC who is used to connect the metal oxide semiconductor field effect tube grid that are used to connect the metal oxide semiconductor field effect tube grid, discharge control end OD connects the grid G 1 of field effect transistor Q1 by resistance R 3, charging control end OC connects the grid G 2 of field effect transistor Q2, the drain D 1 of two field effect transistor, D2 joins, the source S 1 of field effect transistor Q1 connects the negative pole of battery core body B1, and the source S 2 of field effect transistor Q2 connects the electrode (negative pole) of protection output; The collector and emitter that also connects a switch triode Q3 between the grid G 1 of field effect transistor Q1 and the source S 1, the input of switch triode Q3 are provided with the biasing circuit that is made of humidity sensor W1 and resistance R 2.

When humidity sensor W1 is moist, its resistance value descends, the base potential of switch triode Q3 raises and conducting, make between the grid G 1 of field effect transistor Q1 and the source S 1 and connect, the drain D 1 and the source S 1 that are used as the field effect transistor Q1 of discharge control switch are turn-offed, cut off discharge loop, with the safety of protection as the mobile phone of load; And under the battery drying regime; humidity sensor W1 is in high resistance state; switch triode Q3 ends because of its base stage is in electronegative potential; its collector and emitter is in high resistance state, and battery protection integrated circuit U1 may command field effect transistor Q1 and Q1 open charge circuit or the discharge loop to the battery core body.

Claims

1. waterproof mobile phone battery, include housing and be encapsulated in the interior battery core body of this housing, humidity sensor (W1) is installed on described housing, it is characterized in that: the output at described battery core body (B1) is connected to a battery protection integrated circuit (U1), field effect transistor as charge switch (Q2) and a field effect transistor as discharge switch (Q1) are arranged, the drain electrode of these two field effect transistor is joined in the negative pole output loop that is connected on described battery core body, the source electrode of these two field effect transistor and drain electrode all are connected to fast recovery diode, the grid of described field effect transistor as charge switch (Q2) is connected on the charging control end of described battery protection integrated circuit (U1), and the grid of another field effect transistor as discharge switch (Q1) is connected on the discharge control end of described battery protection integrated circuit (U1); Have an input to be connected to the switch triode of described humidity sensor (W1) (Q3), the output of this switch triode (Q3) connects the grid and the source electrode of described semiconductor field as discharge switch (Q1).

2. waterproof mobile phone battery according to claim 1 is characterized in that: the model of described battery protection integrated circuit (U1) is any of S-8211C or S-8211D or S-8241 or S-8261 or SL1051 or CN3052 or DW01; Described humidity sensor (W1) is made of a pair of close electrode mutually.