CN211603485U - Charge-discharge test equipment with over-charge prevention structure - Google Patents

Charge-discharge test equipment with over-charge prevention structure Download PDF

Info

Publication number
CN211603485U
CN211603485U CN201922120549.5U CN201922120549U CN211603485U CN 211603485 U CN211603485 U CN 211603485U CN 201922120549 U CN201922120549 U CN 201922120549U CN 211603485 U CN211603485 U CN 211603485U
Authority
CN
China
Prior art keywords
resistor
positive
resistance
negative
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN201922120549.5U
Other languages
Chinese (zh)
Inventor
罗万里
廖晓斌
何涛
杜浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Fullde Electric Co Ltd
Guangdong Fullde Electronics Co Ltd
Original Assignee
Hunan Fullde Electric Co Ltd
Guangdong Fullde Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Fullde Electric Co Ltd, Guangdong Fullde Electronics Co Ltd filed Critical Hunan Fullde Electric Co Ltd
Priority to CN201922120549.5U priority Critical patent/CN211603485U/en
Application granted granted Critical
Publication of CN211603485U publication Critical patent/CN211603485U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model relates to a charge and discharge test equipment with prevent overcharging structure, connect resistance R6's one end respectively behind comparator U11B's the positive input series resistance R1 in the equipment and survey the electric positive terminal, resistance R6's the other end is connected with the power supply positive terminal, connect resistance R5's one end and survey the electric negative terminal respectively behind comparator U11B's the negative sense input series resistance R2, resistance R5's the other end is connected with the power supply negative terminal, comparator U11B's positive input and output are connected respectively at resistance R4 both ends, resistance R3 one end ground connection, the other end is connected to comparator U11B's negative sense input, comparator U11B's output is used for exporting the voltage information of external battery, resistance R5's resistance far is less than resistance R2 so that the total that makes both add is located resistance R2's allowable deviation; the resistance of the resistor R6 is much smaller than that of the resistor R1, so that the sum of the two values is within the tolerance of the resistance of the resistor R1.

Description

Charge-discharge test equipment with over-charge prevention structure
Technical Field
The utility model relates to a battery charge and discharge test especially relates to a charge and discharge test equipment with prevent overcharging structure.
Background
As shown in fig. 1, the conventional charge and discharge testing apparatus 1 generally has four external terminals, which are a positive power supply terminal 11, a negative power supply terminal 12, a positive electricity testing terminal 13, and a negative electricity testing terminal 14, wherein the positive power supply terminal 11 and the positive electricity testing terminal 13 are electrically connected to the positive electrode of the battery BAT, the negative power supply terminal 12 and the negative electricity testing terminal 14 are electrically connected to the negative electrode of the battery BAT, respectively, during the charge and discharge testing process, the charge and discharge testing apparatus 1 monitors the electric quantity of the battery BAT in real time through the voltage difference between the positive electricity testing terminal 13 and the negative electricity testing terminal 14, and controls the positive power supply terminal 11 and the negative power supply terminal 12 to output/absorb electric energy from/to the battery BAT according to the electric quantity, thereby implementing charge and discharge control.
The existing charge and discharge test equipment has the defects that:
(1) once the collecting wire 131 between the positive electricity testing terminal 13 and the positive electrode of the battery BAT is broken, the charge and discharge testing device 1 can continuously detect that the voltage difference between the positive electricity testing terminal 13 and the negative electricity testing terminal 14 is nearly zero, and then electric energy is always output to the battery BAT, so that the battery BAT is overcharged and ignited;
(2) once the collecting wire 141 between the electricity measuring negative terminal 14 and the battery BAT negative electrode is broken, the potential on the electricity measuring negative terminal 14 will drift, which causes inaccurate detection of the charge and discharge test equipment 1, and the charge and discharge control will be derailed from the actual requirement.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an improve the weak point among the prior art, and provide a charge-discharge test equipment with prevent overcharging structure, its collection electric wire or survey electric wire between electric negative terminal and the battery negative pole between survey electric positive terminal and the battery positive pole when breaking, can avoid battery BAT to overcharge and catch fire or charge-discharge control and actual demand derail.
Therefore, the charging and discharging test equipment with the overcharge prevention structure comprises a power supply positive terminal and a power testing positive terminal which are respectively connected with the anode of an external battery, a power supply negative terminal and a power testing negative terminal which are respectively connected with the cathode of the external battery, a resistor R1, a resistor R2 and a resistor R3, the device comprises a resistor R4, a resistor R5, a resistor R6 and a comparator U11B, wherein a positive input end of the comparator U11B is connected with a resistor R1 in series and then is connected with one end of a resistor R6 and a positive electricity detection end respectively, the other end of the resistor R6 is connected with a positive electricity supply end, a negative input end of the comparator U11B is connected with a resistor R2 in series and then is connected with one end of a resistor R5 and a negative electricity detection end respectively, the other end of the resistor R5 is connected with the negative electricity supply end, two ends of the resistor R4 are connected with a positive input end and an output end of the comparator U11B respectively, one end of the resistor R3 is grounded, the other end of the resistor R5 is connected with the negative electricity detection end of the comparator U;
the resistance value of the resistor R5 is far smaller than that of the resistor R2, so that the sum of the resistance values of the resistor R5 and the resistor R2 is within the allowable deviation of the resistance value of the resistor R2; the resistance of the resistor R6 is much smaller than that of the resistor R1, so that the sum of the two values is within the allowable deviation of the resistance of the resistor R1.
Further, the resistances of the resistor R1 and the resistor R2 are equal, the resistances of the resistor R3 and the resistor R4 are equal, and the resistances of the resistor R5 and the resistor R6 are equal.
Further, the charging and discharging test equipment further comprises an energy storage bank, a mos tube Q1, a mos tube Q2, a diode D1, a diode D2, an inductor L1, a positive Bus +, a negative Bus and a capacitor;
a branch formed by connecting the mos tube Q1 and the mos tube Q2 in series is connected in parallel with the positive pole and the negative pole of the energy storage group, the diode D1 and the diode D2 are respectively connected in parallel with the mos tube Q1 and the diode Q2, the conduction directions of the diodes point to the positive pole of the energy storage group, a joint between the mos tube Q1 and the diode Q2 is connected in series with the inductor L1 and then is connected to the positive end of power supply through a positive Bus +, the negative pole of the energy storage group is connected to the negative end of the power supply through a negative Bus, and the capacitor is bridged between the positive Bus + and the negative Bus.
Further, the energy storage group is a plurality of energy storage capacitors connected in parallel.
Further, the capacitor has a plurality of, and each capacitor is connected in parallel with each other.
Further, the charge and discharge testing equipment further comprises a controller, and the G pole of the mos tube Q1, the G pole of the mos tube Q2 and the output end of the comparator U11B are respectively connected with the controller.
Further, the positive Bus + IS connected with a fuse IS1 in series.
Further, the positive Bus + is connected in series with a switch SW 1.
Has the advantages that:
the utility model discloses a set up resistance R5, R6, and make resistance R5's resistance far be less than resistance R2's resistance, resistance R6's resistance far is less than resistance R1's resistance, thus, when survey collection electric wire between positive end and the battery positive pole or survey collection electric wire fracture between negative end and the battery negative pole, the measured value of comparator U11B output still can keep unanimous with the output when not splitting, make charge-discharge test equipment's charge-discharge control still accurate, avoid leading to battery BAT to overcharge and discharge or control and actual demand derail.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
FIG. 1 is a schematic diagram of a prior art charging and discharging test device for charging a battery BAT;
FIG. 2 is a circuit diagram of the charging and discharging test device of the present invention;
FIG. 3 is a schematic diagram of a current loop when the mos transistor Q1 is turned on and the mos transistor Q2 is turned off in the embodiment;
FIG. 4 is a schematic diagram of a current loop when the mos tube Q1 is turned off and the mos tube Q2 is turned off in the embodiment;
FIG. 5 is a schematic diagram of a current loop when the mos transistor Q1 is turned off and the mos transistor Q2 is turned on in the embodiment;
fig. 6 is a schematic diagram of a current loop when the energy storage voltage of the inductor L1 is injected into the energy storage bank in the embodiment.
Detailed Description
The invention will be further described with reference to the following examples.
The charge and discharge test apparatus 1 of the present embodiment includes a power supply portion and a power measuring portion, as shown in fig. 2.
The power supply part comprises a plurality of energy storage capacitors CAP1 … CAPn, two mos tubes Q1 … Q2, two diodes D1 … D2, three capacitors C3 … C5 and a controller which is not shown in the figure. The energy storage system comprises an energy storage group formed by mutually connecting a plurality of energy storage capacitors CAP1 … CAPn in parallel, branches formed by connecting mos tubes Q1 and Q2 in series are connected in parallel with the positive pole and the negative pole of the energy storage group, a controller respectively controls the on-off of the mos tubes Q1 and Q2, diodes D1 and D2 are respectively connected in parallel with the mos tubes Q1 and Q2, the conducting directions of the diodes are all directed to the positive pole of the energy storage group, the connection point between the mos tubes Q1 and Q2 is connected with an inductor L1 in series and then connected to the positive power supply end 11 through a positive Bus +, the negative pole of the energy storage group is connected to the negative power supply end 12 through a negative Bus-, and the capacitors C3, C4 and C5 are connected in parallel and then bridged between the positive Bus + and the negative Bus-.
If the battery BAT needs to be charged, the controller controls the mos tube Q2 to be in a cut-off state all the time, and outputs PWM to control the mos tube Q1 to be switched on/off, and the circuit performs the battery charging operation as follows:
when the mos tube Q1 is switched on, the energy storage group discharges, the loop is as shown in fig. 3, the current sequentially passes through the energy storage group-mos tube Q1-inductor L1-battery BAT-energy storage group to form a loop, and at the moment, the energy storage group charges the battery BAT and the inductor L1 stores energy;
when the mos transistor Q1 is turned off, the inductor L1 discharges electricity, the loop is as shown in fig. 4, the current sequentially passes through the inductor L1, the battery BAT-diode D2 and the inductor L1 to form a loop, and the inductor L1 continues current for the battery BAT.
If the battery BAT needs to be discharged, the controller controls the mos tube Q1 to be in a cut-off state all the time, and outputs PWM to control the mos tube Q2 to be switched on/off, and the circuit performs battery discharging operation as follows:
when the mos tube Q2 is turned on, the battery BAT discharges, the loop is as shown in fig. 5, the current sequentially passes through the battery BAT-inductor L1-mos tube Q2-battery BAT to form a loop, at this time, the battery BAT discharges to store energy in the inductor L1, the energy storage voltage of the inductor L1 continuously rises, when the energy storage voltage exceeds the voltage of the energy storage group, the loop becomes as shown in fig. 6, at this time, the inductor L1 discharges, the current sequentially passes through the inductor L1-diode D1-energy storage group-capacitor C3 … C5-inductor L1 to form a loop, and the energy storage voltage of the inductor L1 is injected into the energy storage group.
Referring to fig. 2, the electricity measuring part comprises six resistors R1 … R6 and a comparator U11B, wherein the output end of the comparator U11B is connected to the controller, the positive input end of the comparator is connected with the resistor R1 in series and then is connected with one end of the resistor R6 and the electricity measuring positive terminal 13, and the other end of the resistor R6 is connected with the power supply positive terminal 11; the negative input end of the comparator U11B is connected with the resistor R2 in series and then is connected with one end of the resistor R5 and the electricity measuring negative terminal 14 respectively, the other end of the resistor R5 is connected with the electricity supplying negative terminal 12, the two ends of the resistor R4 are connected with the positive input end and the output end of the comparator U11B respectively, one end of the resistor R3 is grounded, and the other end of the resistor R3 is connected with the negative input end of the comparator U11B.
Through parameter setting, the following steps are carried out:
the resistances of the resistors R1 and R2 are equal, the resistances of the resistors R3 and R4 are equal, and the resistances of the resistors R5 and R6 are equal;
the resistance of the resistor R5 is much smaller than that of the resistor R2, so that the total resistance of the two resistors is within the tolerance of the resistance of the resistor R2, for example, the resistance of the resistor R2 is 100K Ω, the tolerance is ± 0.01%, and then R5+ R2 is within ± 0.01% of 100K Ω.
Similarly, the resistance of the resistor R6 is much smaller than that of the resistor R1, so that the sum of the two values is within the allowable deviation of the resistance of the resistor R2.
For example, R1 ═ R2 ═ 100K Ω, R3 ═ R4 ═ 80K Ω, and R5 ═ R6 ═ 100 Ω, then in the charge and discharge test:
(1) when the collecting wires 131 and 141 are not broken, that is, in a normal state, the power supply wire 111 is short-circuited at two ends of the resistor R6, the current on the positive Bus + is directly transmitted to the positive electrode of the battery BAT along the power supply wire 111, and no current exists on the resistor R6, so that the potential of the junction between the resistor R1 and the resistor R6 is equal to the positive electrode potential of the battery BAT, and similarly, the potential of the junction between the resistor R2 and the resistor R5 is equal to the negative electrode potential of the battery BAT, the comparator U11B collects the voltages at two ends of the battery BAT for difference, and outputs a measured value of V × R3/R2 which is V × 4/5, where V is the voltage drop at two ends of the battery, that is, i.e., the positive electrode potential-negative electrode potential;
(2) when the collecting wire 131 is broken, the resistor R6 starts to function, and at this time, the comparator U11B collects the positive voltage of the battery BAT through the resistor R6 and the power supply wire 111 for differentiation, and the measured value output by the comparator U11B is equal to V × R3/(R2+ R6), and the measured value is still approximately equal to V × 4/5 due to the fact that R2+ R6 is equal to R2;
(3) when the collecting wire 141 is broken, the resistor R5 starts to function, and at this time, the comparator U11B collects the negative voltage of the battery BAT through the resistor R5 and the power supply wire 121, so that it is ensured that no potential shift occurs at the positive input end of the comparator U11B, and the measured value output by the comparator U11B is still approximately equal to V × 4/5.
As can be seen from the above, even if the collecting wire 131 or 141 is broken, the measured value output by the comparator U11B is still consistent with the normal output due to the presence of the resistors R5 and R6, and therefore, the controller is still accurate in performing charge and discharge control based on the measured value, thereby avoiding the overcharge and ignition of the battery BAT or the derailment of the charge and discharge control from the actual demand.
Note that the resistances R5 and R6 cannot be replaced with conductive wires so as not to cause current to flow into the collecting wires 131 and 141.
Further, referring to fig. 2, in the present embodiment, a fuse IS1 IS also connected in series to the positive Bus + to realize surge protection, and a switch SW1 IS also connected in series to the positive Bus + to realize total switch control.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (8)

1. The utility model provides a charge-discharge test equipment with prevent overcharging structure, includes the power supply positive terminal that is used for respectively connecing with external battery positive pole and surveys electric positive terminal, be used for the power supply negative terminal that meets with external battery negative pole respectively and survey electric negative terminal, its characterized in that:
the battery protection circuit also comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a comparator U11B, wherein a positive input end of the comparator U11B is connected with a resistor R1 in series and then is respectively connected with one end of a resistor R6 and a positive electricity detection end, the other end of the resistor R6 is connected with a positive electricity supply end, a negative input end of the comparator U11B is connected with a resistor R2 in series and then is respectively connected with one end of a resistor R5 and a negative electricity detection end, the other end of the resistor R5 is connected with a negative electricity supply end, two ends of the resistor R4 are respectively connected with a positive input end and an output end of the comparator U11B, one end of the resistor R3 is grounded, the other end of the resistor R3 is connected with the negative input end of;
the resistance value of the resistor R5 is far smaller than that of the resistor R2, so that the sum of the resistance values of the resistor R5 and the resistor R2 is within the allowable deviation of the resistance value of the resistor R2; the resistance of the resistor R6 is much smaller than that of the resistor R1, so that the sum of the two values is within the allowable deviation of the resistance of the resistor R1.
2. The charge and discharge test device according to claim 1, wherein the resistances of the resistor R1 and the resistor R2 are equal, the resistances of the resistor R3 and the resistor R4 are equal, and the resistances of the resistor R5 and the resistor R6 are equal.
3. The charge and discharge test device according to claim 1,
the charging and discharging test equipment further comprises an energy storage group, a mos tube Q1, a mos tube Q2, a diode D1, a diode D2, an inductor L1, a positive Bus +, a negative Bus and a capacitor;
a branch formed by connecting the mos tube Q1 and the mos tube Q2 in series is connected in parallel with the positive pole and the negative pole of the energy storage group, the diode D1 and the diode D2 are respectively connected in parallel with the mos tube Q1 and the diode Q2, the conduction directions of the diodes point to the positive pole of the energy storage group, a joint between the mos tube Q1 and the diode Q2 is connected in series with the inductor L1 and then is connected to the positive end of power supply through a positive Bus +, the negative pole of the energy storage group is connected to the negative end of the power supply through a negative Bus, and the capacitor is bridged between the positive Bus + and the negative Bus.
4. The charging and discharging test device according to claim 3, wherein the energy storage bank is a plurality of energy storage capacitors connected in parallel with each other.
5. A charge and discharge test device according to claim 3, wherein there are a plurality of said capacitors, each capacitor being connected in parallel with each other.
6. The charging and discharging test device according to claim 3, further comprising a controller, wherein the G pole of the mos tube Q1, the G pole of the mos tube Q2, and the output end of the comparator U11B are respectively connected to the controller.
7. The charge and discharge test device according to claim 3, wherein the positive Bus + IS connected in series with a fuse IS 1.
8. Charging and discharging test equipment according to claim 3 or 7, characterized in that the positive Bus + is connected in series with a switch SW 1.
CN201922120549.5U 2019-11-29 2019-11-29 Charge-discharge test equipment with over-charge prevention structure Withdrawn - After Issue CN211603485U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922120549.5U CN211603485U (en) 2019-11-29 2019-11-29 Charge-discharge test equipment with over-charge prevention structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922120549.5U CN211603485U (en) 2019-11-29 2019-11-29 Charge-discharge test equipment with over-charge prevention structure

Publications (1)

Publication Number Publication Date
CN211603485U true CN211603485U (en) 2020-09-29

Family

ID=72590017

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922120549.5U Withdrawn - After Issue CN211603485U (en) 2019-11-29 2019-11-29 Charge-discharge test equipment with over-charge prevention structure

Country Status (1)

Country Link
CN (1) CN211603485U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110850314A (en) * 2019-11-29 2020-02-28 湖南福德电气有限公司 Charge-discharge test equipment with over-charge prevention structure
CN110850314B (en) * 2019-11-29 2024-11-05 湖南福德电气有限公司 Charging and discharging test equipment with overcharge prevention structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110850314A (en) * 2019-11-29 2020-02-28 湖南福德电气有限公司 Charge-discharge test equipment with over-charge prevention structure
CN110850314B (en) * 2019-11-29 2024-11-05 湖南福德电气有限公司 Charging and discharging test equipment with overcharge prevention structure

Similar Documents

Publication Publication Date Title
CN203466559U (en) Lithium battery charging and discharging protection circuit
CN103545859A (en) Battery pack
CN108063486B (en) Charger suitable for charging various batteries, charging method thereof and electric energy conversion circuit
CN113315198A (en) Can replace lithium battery device that lead acid battery used
CN103105586A (en) Inspection method for battery pack and battery pack
CN211603485U (en) Charge-discharge test equipment with over-charge prevention structure
CN205608090U (en) Automobile -used group battery developments insulation resistance detection device
CN110850314B (en) Charging and discharging test equipment with overcharge prevention structure
CN105006849A (en) Intelligent switching-off control system of battery charger
CN116699467A (en) Battery pack and broken line detection circuit thereof
CN110850314A (en) Charge-discharge test equipment with over-charge prevention structure
JP4108339B2 (en) Lithium ion secondary battery charging method and apparatus
CN202167893U (en) Combined complementary transient-state high-overload uninterrupted power supply module
CN213069108U (en) Battery pack residual capacity measuring circuit
CN209642357U (en) A kind of lithium battery voltage monitoring and protecting device based on electric resistance partial pressure type
JP2855405B2 (en) Storage battery charge / discharge monitoring method and monitoring device
CN111668908A (en) Lithium battery front end protector
CN110061546A (en) One kind is vehicle-mounted to use lithium battery charge and discharge circuit
CN221042339U (en) Charge-discharge protection circuit and electronic device
CN209930026U (en) Starting power supply
CN216121851U (en) Three-wire system charging structure of two strings of batteries
CN212098519U (en) Power management system of lithium ion battery
CN218633419U (en) Lithium battery low-voltage difference current limiting circuit and corresponding lithium battery charging protection system
CN221378216U (en) Battery pack and broken line detection circuit thereof
CN216290235U (en) Differential pressure repair circuit and differential pressure repair device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20200929

Effective date of abandoning: 20241105

AV01 Patent right actively abandoned

Granted publication date: 20200929

Effective date of abandoning: 20241105