CN210839031U - Lithium battery protection circuit and protection board - Google Patents
Lithium battery protection circuit and protection board Download PDFInfo
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- CN210839031U CN210839031U CN201922444755.1U CN201922444755U CN210839031U CN 210839031 U CN210839031 U CN 210839031U CN 201922444755 U CN201922444755 U CN 201922444755U CN 210839031 U CN210839031 U CN 210839031U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 99
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 230000005669 field effect Effects 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 238000013473 artificial intelligence Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a lithium battery protection circuit and protection shield, this protection circuit includes lithium battery charging protection chip, lithium battery charging protection chip's power end concatenates current-limiting protection resistance and the power anodal electricity of lithium battery and power supply terminal that charges and is connected, lithium battery charging protection chip's earthing terminal is established ties self-resuming fuse and is connected with the negative pole electricity of lithium battery that charges, still establish the filter capacitance who is used for steady voltage and filtering between lithium battery charging protection chip's power end and the earthing terminal, lithium battery charging protection chip's charge control port and discharge control port electricity respectively connect the grid of the charge control MOS pipe of field effect transistor and the grid of discharge control MOS pipe; an overcurrent detection port of the lithium battery charging protection chip is connected in series with a current-limiting resistor and is electrically connected with a power supply cathode of a power supply terminal and a source electrode of a charging control MOS tube; the source electrode of the charging control MOS tube is also coupled and electrically connected with a temperature detection sensor for temperature detection and an over-current detection resistor for over-discharge detection.
Description
Technical Field
The utility model belongs to the technical field of the lithium cell protection technique and specifically relates to lithium cell protection circuit and protection shield.
Background
With the development of technology, products of artificial intelligence are more and more brought into the visual field of people. Such as artificial intelligence robots, intelligent furniture. At present, the artificial intelligent robot and the intelligent furniture are powered by rechargeable lithium batteries. Because the lithium battery is made of materials, the lithium battery cannot be overcharged, overdischarged, overcurrent, short-circuited and charged and discharged at ultrahigh temperature, and if a protection circuit is not arranged on the lithium battery, the performance and the service life of the lithium battery are seriously influenced; moreover, a large amount of gas is generated in the process of overcharge, overdischarge, overcurrent, short circuit and ultrahigh-temperature charge and discharge, so that the internal pressure of the lithium battery is rapidly increased and then the lithium battery explodes to cause safety problems.
In the related art, a better technical solution for solving the above problems is still lacking.
SUMMERY OF THE UTILITY MODEL
The technical problem of the solution of the utility model is to the defect of existence among the above-mentioned prior art, provide a lithium cell protection circuit and protection shield, thereby with dynamic monitoring lithium cell voltage with fill the circuit of charge-discharge flow, prevent that the lithium cell from taking place abominable damage.
In order to solve the technical problem, the utility model discloses a technical scheme as follows, lithium battery protection circuit, including HY2510 lithium battery charging protection chip U1, HY2510 lithium battery charging protection chip U1's power end VDD concatenates current-limiting protection resistance R1 and is connected with the power supply positive pole electricity of lithium cell and power supply terminal that charges, HY2510 lithium battery charging protection chip U1's earthing terminal VSS is established ties self-resuming fuse P1 with the negative pole electricity of lithium cell that charges is connected, still establish between HY2510 lithium battery charging protection chip U1's power end VDD and earthing terminal VSS and be used for steady voltage and filtering filter capacitance C1, HY2510 lithium battery charging protection chip U1's charge control port COUT and discharge control port DODODOUT are connected the grid G2 of the charge control MOS pipe of field effect transistor Q1 and the grid G1 of discharge control MOS pipe respectively; an overcurrent detection port V-series current limiting resistor R2 of the HY2510 lithium battery charging protection chip U1 is electrically connected with a power supply cathode of the power supply terminal and a source S2 of the charging control MOS tube; the source S2 of the charging control MOS tube is also coupled and electrically connected with a temperature detection sensor R3 for temperature detection and an over-current detection resistor R4 for over-discharge detection.
As a further elaboration of the above technical solution:
in the above technical solution, the self-healing fuse P1 is a SMD1210P550SLR type patch self-healing fuse.
In the above technical solution, the fet Q1 is a dual-power fet CJAE 2002.
In the above technical solution, the temperature detection sensor is an MF72 thermistor.
In the above technical solution, the resistance value of the over-current detection resistor R4 is 99K Ω to 101K Ω.
In the above technical solution, the resistance value of the current limiting protection resistor R1 is 100 Ω -200 Ω.
In the above technical solution, the resistance value of the current limiting resistor R2 is 1000 Ω -2000 Ω.
In the above technical solution, the capacitance of the filter capacitor C1 is 0.01 μ F to 1 μ F.
In order to solve the technical problem, the utility model discloses another kind of technical scheme who takes as follows, a protection shield, including the PCB circuit board, the system has protection circuit on the PCB circuit board, protection circuit is as above-mentioned arbitrary lithium battery protection circuit.
Compared with the prior art, the utility model has the advantages that the lithium battery charging and discharging protection circuit protects overcharge, overdischarge, overcurrent and short circuit in the lithium battery charging and discharging process by adopting an HY2510 lithium battery charging protection chip, and the protection circuit and the self-recovery fuse are completed in a coordinated manner by adding the self-recovery fuse in the protection circuit, dynamically monitors the voltage of the lithium battery and the current of the charging and discharging loop in the environment of-40 ℃ to +85 ℃, and immediately controls the on-off of the current loop; the recovery fuse prevents severe damage of the battery under high temperature environment.
Drawings
Fig. 1 is a schematic circuit diagram of the charge and discharge protection circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a lesser level than the second feature
Referring to the attached drawing 1, the utility model discloses a lithium battery protection circuit is that the charge-discharge that is used for the lithium cell of artificial intelligence robot carries out the protection, thereby in order to solve dynamic monitoring lithium cell voltage and the circuit of charging-discharging backward flow, prevents that the lithium cell from taking place abominable damage. Referring to fig. 1, the lithium battery protection circuit of this embodiment includes an HY2510 lithium battery charging protection chip U1, a power source terminal VDD of the HY2510 lithium battery charging protection chip U1 is connected in series with a current-limiting protection resistor R1 to be electrically connected with a lithium battery (B +) charged and a power source anode (P +) of a power supply terminal, a line protection resistor R1 is used to provide a reference power supply resistor, the power supply terminal is used for inputting electric energy during charging, the power supply terminal is used to output electric energy to supply a control board of an artificial intelligent robot during discharging, a VSS grounding terminal of the HY2510 lithium battery charging protection chip U1 is connected in series with a self-recovery fuse P1 to be electrically connected with a cathode (B-) of the lithium battery charged, a filter capacitor C1 used for voltage stabilization and filtering is further disposed between the power source terminal VDD of the HY2510 lithium battery charging protection chip U1 and the grounding terminal VSS, a charging control port COUT and a discharging control port DOUT of the HY2510 lithium battery charging protection chip U2 are respectively electrically connected with A grid G1 of the discharge control MOS tube; an overcurrent detection port V-series current limiting resistor R2 of the HY2510 lithium battery charging protection chip U1 is electrically connected with a power supply cathode (P-) of the power supply terminal and a source S2 of the charging control MOS tube, namely, an electrode of the current limiting resistor R2, the power supply cathode (P-) of the power supply terminal and the source S2 of the charging control MOS tube are electrically connected, the electric connection point is a negative output/input port of a lithium battery protection circuit, and the resistor R2 is used for overcurrent detection; the source S2 of the charging control MOS tube (namely, the negative output/input port of the lithium battery protection circuit) is also coupled and electrically connected with a temperature detection sensor R3 for temperature detection and an over-current detection resistor R4 for over-discharge detection, in practice, the temperature detection sensor R3 and the over-current detection resistor R4 are electrically connected with a control board of the artificial intelligent robot, and the protection circuit is monitored and controlled through the control board.
It can be understood that, in order to realize the charge and discharge protection of the lithium battery, the self-recovery fuse P1 is a patch self-recovery fuse of an SMD1210P550SLR model; the field effect tube Q1 is a double-power field effect tube CJAE 2002; the temperature detection sensor R3 is an MF72 thermistor, the nominal resistance of the thermistor R3 is 100K omega +/-1%, the thermistor index B is 3435K, the thermistor R3 is used for measuring temperature, controlling temperature and compensating the temperature of elements, devices and circuits, and the temperature is controlled to be 20-30%; the resistance value of the over-current detection resistor R4 is 99K omega-101K omega, preferably 100K omega, the resistance value of the current-limiting protection resistor R1 is 100 omega-200 omega, preferably 100 omega, the resistance value of the current-limiting resistor R2 is 1000 omega-2000 omega, preferably 2000 omega, and the capacitance of the filter capacitor C1 is 0.01 muF-1 muF, preferably 0.1 muF.
It should be noted that the HY2510 lithium battery charging protection chip U1 is the main control of the protection circuit, and when charging and discharging are actually protected, the voltage of the charging lithium battery is sampled first, and then various instructions are sent by judgment, and the field effect transistor Q1 performs on-off control on the charging or discharging process. The utility model discloses a protection circuit has following function, firstly, overcharges protect function: the overcharge protection function is a function of prohibiting a charger from continuing charging when a certain voltage (hereinafter referred to as overcharge detection voltage) is reached, that is, stopping charging by turning off a charge control MOS transistor of a field effect transistor Q1 for controlling overcharge; secondly, the over-discharge protection function: the over-discharge protection function is that when the voltage of the battery becomes low, the discharge of the electric energy output along the power supply terminal is stopped, the discharge control MOS tube for controlling the over-discharge enters a turn-off state, and the discharge is forbidden, and the process is just opposite to the action during the over-charge detection; thirdly, the overcurrent protection function: the overcurrent protection function is to stop discharging the load when consuming large current, and the function is to protect the lithium battery and the field effect transistor Q1, ensure the safety of the battery in the working state, and after the overcurrent detection, the lithium battery is recovered to the normal state after being separated from the load, and can be recharged or discharged; fourthly, the short-circuit protection function is the same as the overcurrent protection function.
The following operating states of the protection circuit are explained below:
normal operation of the protection circuit
The HY2510 lithium battery charging protection chip U1 continuously detects the battery voltage between VDD and VSS and the voltage difference between V-and VSS to control charging and discharging. When the voltage of the lithium battery is above the over-discharge detection voltage and below the over-charge detection voltage and the voltage of the V-terminal is above the charge over-current detection voltage and below the discharge over-current detection voltage, both the OC and OD ports of the HY2510 lithium battery charge protection chip U1 output high levels to turn on the charge control MOSFET and the discharge control MOSFET simultaneously, and in this state, both charge and discharge can be performed freely.
Protection circuit overcharge protection
A charging power supply is connected to a P + and a P-, the positive pole of the power supply is connected with a B +, the negative pole of the power supply is connected with a B-, after the power supply is connected, the lithium battery starts to charge, the current direction starts from the positive pole of the power supply, the current flows through the lithium battery, D1 and the charging control MOS tube to the negative pole of the power supply (at the moment, the discharging control MOS tube is short-circuited by D1), an HY2510 lithium battery charging protection chip U1 samples the voltage value of the lithium battery through a capacitor, when the voltage of the lithium battery reaches 4.3, the HY2510 lithium battery charging protection chip U1 sends an instruction to enable a port CO to be at a low level, at the moment, the current starts from the positive pole of the power supply, flows through the lithium battery, D1 and reaches the charging control MOS tube, as the grid of the charging control MOS tube is connected with the CO and is also
After the P + and the P-are connected with a load, the lithium battery starts to discharge current from the anode of the lithium battery to the cathode of the lithium battery through the load, the D2 and the discharge control MOS tube (at this time, the charge control MOS tube is short-circuited by the D2); when the lithium battery discharges to 2.85, the HY2510 lithium battery charging protection chip U1 samples and sends an instruction to cut off the discharge control MOS transistor, so that the discharge loop is cut off, the battery cannot discharge the load any more, and the overdischarge protection effect is achieved.
Overcurrent protection of protection circuit
In the normal discharge process of the lithium battery to the load, when the discharge current passes through the charging control MOS tube and the discharging control MOS tube which are connected in series, a voltage can be generated at two ends of the charging control MOS tube and the discharging control MOS tube due to the on-resistance of the charging control MOS tube and the discharging control MOS tube, a voltage value is detected by a 'V' -pin on a HY2510 lithium battery charging protection chip U1, if the load is abnormal due to some reason, the loop current is increased, when the loop current is large enough to enable U to be larger than 0.105V, the 'DOut' pin is converted from high voltage to zero voltage, and G1 and S1 are switched from on to off, so that the discharging loop is cut off, the current in the loop is zero, and the overcurrent protection effect is achieved.
Short-circuit protection of protection circuit
After the P + and the P-are connected with an empty load, the lithium battery starts to discharge current, the current flows from the positive electrode of the lithium battery to the negative electrode of the lithium battery through the load, the D2 and the discharge control MOS tube (at this time, the charge control MOS tube is short-circuited by the D2), the HY2510 lithium battery charging protection chip U1 samples the voltage generated by suddenly increasing the current through the VM pin, the HY2510 lithium battery charging protection chip U1 samples and sends out an instruction, the discharge control MOS tube is cut off, the loop is disconnected, and the lithium battery is protected.
When the battery discharges to the load, if the loop current is large enough to enable U to be more than 0.6V, the HY2510 lithium battery charging protection chip U1 judges that the load is short-circuited, the DOUT pin of the chip is rapidly changed from high voltage to zero voltage, and G1 and S1 are switched from on to off, so that the discharging loop is cut off, and the short-circuit protection effect is achieved
In the working process of the protection circuit, the self-recovery fuse P1(PTC), the thermistor R3(NTC) and the over-current detection resistor R4 detect the temperature and current conditions in the protection circuit, so that the protection circuit can be effectively protected.
The embodiment further provides a protection circuit, which includes a PCB (not shown in the drawings), where the PCB is provided with the protection circuit, and the protection circuit is a lithium battery protection circuit as described above.
The above is not intended to limit the technical scope of the present invention, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are all within the scope of the technical solution of the present invention.
Claims (9)
1. The lithium battery protection circuit is used for an artificial intelligent robot and is characterized by comprising an HY2510 lithium battery charging protection chip U1, wherein a power supply end VDD of the HY2510 lithium battery charging protection chip U1 is connected with a current-limiting protection resistor R1 in series and is electrically connected with a power supply anode of a rechargeable lithium battery and a power supply terminal, a grounding end VSS of the HY2510 lithium battery charging protection chip U1 is connected with a self-recovery fuse P1 in series and is electrically connected with a cathode of the rechargeable lithium battery, a filter capacitor C1 for voltage stabilization and filtering is further arranged between the power supply end VDD and the VSS grounding end of the HY2510 lithium battery charging protection chip U1, and a charging control port COUT and a discharging control port DOUT of the HY2510 lithium battery charging protection chip U1 are respectively and electrically connected with a grid G2 of a charging control MOS tube and a grid G1 of a discharging control MOS tube; an overcurrent detection port V-series current limiting resistor R2 of the HY2510 lithium battery charging protection chip U1 is electrically connected with a power supply cathode of the power supply terminal and a source S2 of the charging control MOS tube; the source S2 of the charging control MOS tube is also coupled and electrically connected with a temperature detection sensor R3 for temperature detection and an over-current detection resistor R4 for over-discharge detection.
2. The lithium battery protection circuit of claim 1, wherein the self-healing fuse P1 is a SMD1210P550SLR model patch self-healing fuse.
3. The lithium battery protection circuit of claim 1, wherein the fet Q1 is a dual power fet CJAE 2002.
4. The lithium battery protection circuit of claim 1, wherein the temperature detection sensor is an MF72 thermistor.
5. The lithium battery protection circuit of claim 1, wherein the over-current detection resistor R4 has a resistance value of 99K Ω -101K Ω.
6. The lithium battery protection circuit of claim 1, wherein the resistance value of the current limiting protection resistor R1 is 100 Ω -200 Ω.
7. The lithium battery protection circuit of claim 1, wherein the resistance value of the current limiting resistor R2 is 1000 Ω -2000 Ω.
8. The lithium battery protection circuit as claimed in claim 1, wherein the filter capacitor C1 has a capacitance of 0.01 μ F to 1 μ F.
9. A protection board, comprising a PCB circuit board, wherein a protection circuit is manufactured on the PCB circuit board, and the protection circuit is the lithium battery protection circuit as claimed in claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922444755.1U CN210839031U (en) | 2019-12-28 | 2019-12-28 | Lithium battery protection circuit and protection board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922444755.1U CN210839031U (en) | 2019-12-28 | 2019-12-28 | Lithium battery protection circuit and protection board |
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| CN210839031U true CN210839031U (en) | 2020-06-23 |
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| CN201922444755.1U Active CN210839031U (en) | 2019-12-28 | 2019-12-28 | Lithium battery protection circuit and protection board |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142543A (en) * | 2020-09-04 | 2022-03-04 | 北京小米移动软件有限公司 | Battery charging and discharging loop, charging method and device and electronic equipment |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
| CN114335763A (en) * | 2021-12-08 | 2022-04-12 | 西安航空学院 | Method for repairing waste lithium ion battery |
-
2019
- 2019-12-28 CN CN201922444755.1U patent/CN210839031U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142543A (en) * | 2020-09-04 | 2022-03-04 | 北京小米移动软件有限公司 | Battery charging and discharging loop, charging method and device and electronic equipment |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
| CN114243806B (en) * | 2020-09-09 | 2024-05-14 | 高创(苏州)电子有限公司 | Battery charge and discharge control system and electronic equipment |
| CN114335763A (en) * | 2021-12-08 | 2022-04-12 | 西安航空学院 | Method for repairing waste lithium ion battery |
| CN114335763B (en) * | 2021-12-08 | 2023-05-09 | 西安航空学院 | A kind of repairing method of waste lithium-ion battery |
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