CN201975767U - Temperature protective device for charging and discharging lithium battery - Google Patents
Temperature protective device for charging and discharging lithium battery Download PDFInfo
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- CN201975767U CN201975767U CN2010206855142U CN201020685514U CN201975767U CN 201975767 U CN201975767 U CN 201975767U CN 2010206855142 U CN2010206855142 U CN 2010206855142U CN 201020685514 U CN201020685514 U CN 201020685514U CN 201975767 U CN201975767 U CN 201975767U
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Abstract
The utility model disclose a temperature protective device for charging and discharging a lithium battery, which comprises a circuit board with a temperature protective circuit for charging and discharging the lithium battery, a temperature protector and a temperature sensor, and is characterized in that the temperature protector and the temperature sensor are respectively positioned on the outer surface of the lithium battery to be protected, signal lines of the temperature protector and the temperature sensor are connected with the circuit board of the temperature protection circuit for charging and discharging the lithium battery, the temperature protector is connected with the input end TS of the temperature protection circuit for charging and discharging the lithium battery, and the temperature sensor is connected with the input end THI of the temperature protection circuit for charging and discharging the lithium battery. The temperature protective device for charging and discharging the lithium battery has the advantages that the structure is simple, the self electricity consumption is low, the reliability is high, the cost is low, and the temperature during the charging and discharging of the lithium battery can be controlled, so that the lithium battery can be more safely and reliably applied.
Description
Technical field
The utility model relates to a kind of temperature protective device, particularly a kind of temperature protective device of lithium cell charging discharge.
Background technology
Lithium ion battery is known as green energy resource.Its volume is little, and is in light weight, and capacity is big, pollution-free.Be familiar with by everybody gradually, be applied to every field.Though lithium ion battery has many good qualities, it also has a big shortcoming.In use promptly, as not protected, can make over-charging of battery, cross put, overcurrent, excess temperature, cause cell damage, the lost of life can explosive combustion when serious.Serious threat people's life security.Everybody often use special chip control the overcharging of battery, cross put, overcurrent, and ignored the situation of excess temperature.During too high the or low temperature of battery temperature, very big to the charging and discharging influence, can destroy the inside battery structure, the damage battery.Can constitute injury to human body when serious.
The utility model content
The purpose of this utility model be provide in order to solve above-mentioned the deficiencies in the prior art a kind of simple in structure, low from power consumption, reliability is high, cost is low; and can control lithium cell charging, the temperature when discharging, make the temperature protective device of safer in application, the more reliable lithium cell charging discharge of lithium battery.
To achieve these goals; the temperature protective device of a kind of lithium cell charging discharge that the utility model is designed; it comprises the circuit board of the temperature protection circuit that is provided with the lithium cell charging discharge; temperature protector and temperature sensor; it is characterized in that temperature protector and temperature sensor are positioned at respectively on the protected lithium battery outer surface; the holding wire of temperature protector and temperature sensor is connected with the circuit board of the temperature protection circuit of lithium cell charging discharge; wherein temperature protector is connected with the temperature protector input TS of the temperature protection circuit of lithium cell charging discharge, and temperature sensor is connected with the temperature sensor inputs THI of the temperature protection circuit of lithium cell charging discharge.
The temperature protection circuit of the described lithium cell charging discharge that is provided with on circuit board comprises battery charge/discharge control circuit and the chip U1 that is made up of switch MOS pipe Q4, Q1, Q2 and peripheral circuit, is connected with charging temperature control circuit unit and discharge over-temperature protection unit at the control end Q4-4 of battery charge/discharge control circuit; Described discharge over-temperature protection unit mainly is made up of U1, Q1, Q2 and the temperature protector that is connected with temperature protector input TS; Described charging temperature control circuit unit comprises reference voltage supply circuit, temperature sampling circuit, voltage comparator and Q5, Q6, and wherein voltage comparator is made up of U2 and peripheral circuit; U2 is made up of U2A and U2B, and the reference voltage supply circuit is made up of respectively R20, R21 and R22, R23, and temperature sampling circuit is made up of with the temperature sensor that temperature sensor inputs THI is connected R19; The output of voltage comparator is connected with Q5, and Q5 is connected in series with Q6, and is connected with control end Q4-4 by Q6 output.
The utility model is formed the reference voltage supply circuit respectively and reference voltage is provided by R20, R21 and R22, R23, by R19, temperature sensor is formed temperature sampling circuit that sampled voltage is provided, and adopts temperature sensor directly to detect battery temperature, converts voltage signal in circuit to, obtain sampled voltage, reference voltage and sampled voltage through U2 relatively after, when U2 output high level, control Q5 conducting, Q6 conducting, make DC+ directly arrive Q4-4, Q4 is ended, stop charging, finish cell charge protection; When the U2 output low level, Q5 conducting, Q6 are in cut-off state, and Q4 is in former operating state.
The described discharge over-temperature protection unit of mainly forming by U1, Q1, Q2 and temperature protector; its temperature protector is connected the CTL end of the U1-11 of chip U1; when battery temperature is higher than 70 ℃; temperature protector disconnects; the U1-11 current potential is raise, the DOP end output high level of U1-3, Q1, Q2 end; stop discharge, finish battery discharge protection.
The temperature protective device of lithium cell charging that the utility model provides discharge is when over-charge of lithium battery, cross and put, during overcurrent, finished by chip U1 control Q4, Q1, Q2; When excess temperature, will use temperature sensor, U2, Q5, Q6, temperature protector TS and its peripheral cell, relend with U1, Q4, Q1, Q2 and finish.
Wherein temperature protection divides two parts to carry out, and the one, by the circuit that U2, Q5, Q6, temperature sensor and other elements are formed, during mainly to battery charge, cross high temperature and the protection of low temperature excessively; The 2nd, the usefulness temperature protector cooperates with U1, the high temperature protection excessively during to battery discharge.
The temperature protective device of the lithium cell charging discharge that the utility model obtains is with the protection control core of battery protection chip U1 as the battery charge discharge.U1 realizes the charging to battery, the control of discharge by control Q4, Q1, Q2.To the height of battery temperature, we adopt the thermistor sampling, and according to the characteristics of thermistor, temperature is high more, and the resistance of thermistor is low more.Otherwise temperature is low more, and resistance is high more.We utilize voltage comparator U2, temperature sensor and some components and parts built-up circuits, by sampling, benchmark, comparison, output control U1, utilize U1 control Q4, Q1, Q2, the temperature control when being implemented in lithium cell charging, discharge.Temperature when final control lithium cell charging, discharge makes lithium battery safer in application, more reliable.This circuit structure is simple, low from power consumption, reliability is high, cost is low.By components and parts such as U1, Q1, Q2, to the temperature protection of lithium battery.According to above-mentioned condition, we have researched and developed this simple and practical temperature protection circuit.Make lithium ion battery safer in application, more reliable, more perfect.
Description of drawings
Fig. 1 is battery charge/discharge control circuit and discharge over-temperature protection element circuit schematic diagram;
Fig. 2 is a charging temperature control circuit unit local circuit schematic diagram;
Fig. 3 is the utility model structural representation.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Embodiment:
As shown in Figure 3; the temperature protective device of a kind of lithium cell charging discharge that present embodiment provided; it comprises the circuit board 111 of the temperature protection circuit that is provided with the lithium cell charging discharge; temperature protector 112 and temperature sensor 113; temperature protector 112 and temperature sensor 113 are positioned at respectively on the protected lithium battery outer surface; the holding wire of temperature protector 112 and temperature sensor 113 and lithium cell charging; the circuit board 111 of the temperature protection circuit of discharge connects; wherein temperature protector 112 and lithium cell charging; the temperature protector input TS of the temperature protection circuit of discharge connects, and temperature sensor 113 is connected with the temperature sensor inputs THI of the temperature protection circuit of lithium cell charging discharge.
As shown in Figure 1 and Figure 2, wherein the A point among Fig. 1 and Fig. 2 is a tie point, forms the circuit theory diagrams of an integral body.The temperature protection circuit of the described lithium cell charging discharge that is provided with on circuit board 111 comprises battery charge/discharge control circuit and the chip U1 that is made up of switch MOS pipe Q4, Q1, Q2 and peripheral circuit, is connected with charging temperature control circuit unit and discharge over-temperature protection unit at the control end Q4-4 of battery charge/discharge control circuit; Described discharge over-temperature protection unit mainly is made up of U1, Q1, Q2 and the temperature protector 112 that is connected with temperature protector input TS; Described charging temperature control circuit unit comprises reference voltage supply circuit, temperature sampling circuit, voltage comparator and Q5, Q6, and wherein voltage comparator is made up of U2 and peripheral circuit; U2 is made up of U2A and U2B, and the reference voltage supply circuit is made up of respectively R20, R21 and R22, R23, and temperature sampling circuit is made up of the temperature sensor 113 that R19 is connected with temperature sensor inputs THI; The output of voltage comparator is connected with Q5, and Q5 is connected in series with Q6, and is connected with control end Q4-4 by Q6 output.
At this, voltage comparator U2 can select LW358 for use, and temperature sensor can adopt thermistor.
Wherein, form the reference voltage supply circuit respectively and reference voltage is provided by R20, R21 and R22, R23, by R19, temperature sensor 113 is formed temperature sampling circuit that sampled voltage is provided, adopt temperature sensor 113 directly to detect battery temperature, in circuit, convert voltage signal to, obtain sampled voltage, reference voltage and sampled voltage through U2 relatively after, when U2 output high level, control Q5 conducting, Q6 conducting make DC+ directly arrive Q4-4, and Q4 is ended, stop charging, finish cell charge protection; When the U2 output low level, Q5 conducting, Q6 are in cut-off state, and Q4 is in former operating state; The main discharge over-temperature protection unit of forming by U1, Q1, Q2 and temperature protector 112; its temperature protector 112 is connected the CTL end of the U1-11 of chip U1; when battery temperature is higher than 70 ℃; temperature protector 112 disconnects; the U1-11 current potential is raise, the DOP end output high level of U1-3, Q1, Q2 end; stop discharge, finish battery discharge protection.
During operate as normal, Q4, Q1, Q2 conducting, battery charge; Q1, Q2 conducting, battery regular picture.
Control and management process when charging normal: DC+, DC-insert charge power supply, directly four batteries serial connection is charged by Q4, D1, D1-1, Q1, Q2, in this four batteries charging process, as long as wherein a batteries reaches the 4.2V deboost,, insert U1 by the VC1-VC4 of U1, make the COP control terminal of U1 become high impedance, be high level by drawing on R25, the R14, charging becomes OFF with Q4, and stops charging.
When battery temperature is too high or too low, also can protect battery, stop charging.
We form the charging temperature control circuit unit with U2, Q5, Q6, temperature sensor 113 and other elements.Form reference voltage by R20, R21, R22, R23.Dividing potential drop between R20 and the R21 is added to U2A-2; Dividing potential drop between R22 and the R23 is added to U2B-5.Form sample circuit by R19 and temperature sensor 113, the dividing potential drop of R19 and temperature sensor 113 is added to U2-3 and U2-6 respectively, compares with reference voltage, and the output high level is effective.We utilize the characteristic of temperature sensor 113, and when temperature was high, resistance diminished.When temperature was hanged down, resistance uprised.
When battery temperature was higher than 45 ℃, temperature sensor 113 resistances diminished, the dividing potential drop of R19 and temperature sensor 113 promptly: the voltage of U2B-6 is lower than the voltage of U2B-5, U2B-7 exports high level, make the Q5 conducting by D4, R16, be added to Q6-B, make the Q6 conducting by R45, R17 dividing potential drop.DC+ can directly be added to Q4-4 like this, and Q4 is ended fully, stops charging.
When battery temperature was lower than below 0 ℃, it is big that temperature sensor 113 resistances become, the dividing potential drop of R19 and temperature sensor 113 promptly: the voltage of U2A-3 is higher than the voltage of U2A-2, U2A-1 exports high level, make the Q5 conducting by D3, R16, be added to Q6-B, make the Q6 conducting by R45, R17 dividing potential drop.DC+ can directly be added to Q4-4, and Q4 is ended fully, stops charging.
Control and management process during regular picture:
P+, P-insert load (motor), and Q1, Q2 are in conducting state, and load has electric current to flow through, and motor rotates.
Over:
In the four batteries discharge processes,,, insert U1, make the DOP control terminal of U1 become high potential, by R7 Q1, Q2 are ended, and stop discharge by the VC1-VC4 of U1 as long as wherein a batteries is reduced to the 2.5V deboost.
Overcurrent protection:
During excessive or short circuit, the VMP terminal becomes the VDD current potential by the voltage that internal resistance RVMD is pulled to the DOP terminal of VDD.U1 when load current, and Q1, the Q2 of discharge usefulness end, and stop discharge.
Over-temperature protection:
Mainly form discharge over-temperature protection unit by U1, Q1, Q2 and temperature protector TS; in the battery regular picture process; if temperature too high (more than 70 ℃); temperature protector 112 meeting automatic disconnections; the CTL current potential of U1 is raise, and the DOP that facilitates U1 is a high level, is added to Q1, the Q2 control utmost point by R7; Q1, Q2 are ended, stop discharge.
Claims (2)
1. the temperature protective device of lithium cell charging discharge; it comprises the circuit board (111) of the temperature protection circuit that is provided with the lithium cell charging discharge; temperature protector (112) and temperature sensor (113); it is characterized in that temperature protector (112) and temperature sensor (113) are positioned at respectively on the protected lithium battery outer surface; the holding wire of temperature protector (112) and temperature sensor (113) is connected with the circuit board (111) of the temperature protection circuit of lithium cell charging discharge; wherein temperature protector (112) and lithium cell charging; the temperature protector input TS of the temperature protection circuit of discharge connects, and temperature sensor (113) is connected with the temperature sensor inputs THI of the temperature protection circuit of lithium cell charging discharge.
2. the temperature protective device of lithium cell charging discharge according to claim 1, the temperature protection circuit that it is characterized in that the described lithium cell charging discharge that is provided with on circuit board (111) comprises battery charge/discharge control circuit and the chip U1 that is made up of switch MOS pipe Q4, Q1, Q2 and peripheral circuit, is connected with charging temperature control circuit unit and discharge over-temperature protection unit at the control end Q4-4 of battery charge/discharge control circuit; Described discharge over-temperature protection unit mainly is made up of U1, Q1, Q2 and the temperature protector (112) that is connected with temperature protector input TS; Described charging temperature control circuit unit comprises reference voltage supply circuit, temperature sampling circuit, voltage comparator and Q5, Q6, and wherein voltage comparator is made up of U2 and peripheral circuit; U2 is made up of U2A and U2B, and the reference voltage supply circuit is made up of respectively R20, R21 and R22, R23, and temperature sampling circuit is made up of the temperature sensor (113) that R19 is connected with temperature sensor inputs THI; The output of voltage comparator is connected with Q5, and Q5 is connected in series with Q6, and is connected with control end Q4-4 by Q6 output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206855142U CN201975767U (en) | 2010-12-28 | 2010-12-28 | Temperature protective device for charging and discharging lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206855142U CN201975767U (en) | 2010-12-28 | 2010-12-28 | Temperature protective device for charging and discharging lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201975767U true CN201975767U (en) | 2011-09-14 |
Family
ID=44580864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206855142U Expired - Fee Related CN201975767U (en) | 2010-12-28 | 2010-12-28 | Temperature protective device for charging and discharging lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201975767U (en) |
-
2010
- 2010-12-28 CN CN2010206855142U patent/CN201975767U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20191228 |