CN212343370U - Lithium battery pack capable of realizing safe charging - Google Patents
Lithium battery pack capable of realizing safe charging Download PDFInfo
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- CN212343370U CN212343370U CN202021172012.XU CN202021172012U CN212343370U CN 212343370 U CN212343370 U CN 212343370U CN 202021172012 U CN202021172012 U CN 202021172012U CN 212343370 U CN212343370 U CN 212343370U
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Abstract
The utility model discloses a lithium battery pack capable of realizing safe charging, which comprises two lithium battery packs and an overcharge detection switching circuit, wherein the overcharge detection switching circuit comprises a single-pole double-throw switching circuit, a voltage conversion circuit, a first signal detection processing circuit and a filter circuit, the voltage conversion circuit converts the anode voltage of a second lithium battery pack into voltage output representing that any one lithium battery pack has overcharge, the first signal detection processing circuit judges whether any one lithium battery pack has overcharge in the first lithium battery pack, and then outputs an overcharge signal or a non-overcharge signal based on the determination result, and when the first signal detection processing circuit outputs the overcharge signal, the switching circuit is connected with a control signal output by the charger at the ID, and the single-pole double-throw switching circuit outputs the voltage converted by the voltage conversion circuit at the moment; the advantage is that can not frequently carry out the switch and switch, and the noise of charging is less, and life is longer, reduces the risk that takes place the incident.
Description
Technical Field
The utility model relates to a lithium cell package especially relates to a can realize safe lithium cell package that charges.
Background
With the rapid development of the lithium battery power supply industry and the expansion of the application field, the safety of lithium battery power supply is also widely concerned. As shown in fig. 1, an existing lithium battery pack generally includes two lithium battery packs and an overcharge detection switching circuit, where each lithium battery pack includes 5 lithium batteries (more than two lithium batteries are connected in parallel and also counted as one lithium battery), an anode of the 5 th lithium battery is used as an anode of the lithium battery pack, an anode of the j th lithium battery is connected to a cathode of the j +1 th lithium battery, and j is 1,2,3,4, and a cathode of the 1 st lithium battery is used as a cathode of the lithium battery pack; the overcharge detection switching circuit consists of two relays, each relay respectively comprises a coil and a double-pole double-throw switch, the double-pole double-throw switch respectively comprises two public ends and two groups of switching ends, each group of switching ends consists of two switching ends, the two public ends correspond to the two groups of switching ends one by one, the two public ends of the double-pole double-throw switch are respectively called a first public end and a second public end, the two switching ends of the group of switching ends corresponding to the first public end are respectively called a first switching end and a second switching end, the two switching ends of the group of switching ends corresponding to the second public end are respectively called a third switching end and a fourth switching end, the two lithium battery groups are respectively called a first lithium battery group and a second lithium battery group, the two relays are respectively called a first relay and a second relay, the positive electrode of the 4 th lithium battery group in the second battery group is connected with the first switching end of the double-pole double-throw switch of the first relay K1, the positive electrode of the 3 rd lithium battery in the second lithium battery pack is connected with the third switching end of the double-pole double-throw switch of the first relay K1, the positive electrode of the 2 nd lithium battery in the second lithium battery pack is connected with the first switching end of the double-pole double-throw switch of the second relay K2, the positive electrode of the 1 st lithium battery in the second lithium battery pack is connected with the third switching end of the double-pole double-throw switch of the second relay K2, the positive electrode of the 4 th lithium battery in the first lithium battery pack is connected with the second switching end of the double-pole double-throw switch of the first relay K1, the positive electrode of the 3 rd lithium battery in the first lithium battery pack is connected with the fourth switching end of the double-pole double-throw switch of the first relay K1, the positive electrode of the 2 nd lithium battery in the first lithium battery pack is connected with the second switching end of the double-pole double-throw switch of the second relay K2, the positive electrode of the 1 st lithium battery pack is connected with the fourth switching end of the double-pole double-throw switch of the second relay K2, the one end of the negative pole of the 1 st section of lithium cell in the second lithium cell group, the coil of first relay K1 and the one end of the coil of second relay K2 are connected the back ground connection, the negative pole of the 1 st section of lithium cell in the first lithium cell group is ground connection alone, the other end of the coil of first relay K1 and the other end of the coil of second relay K2 are connected and its link is as the overcharge detection control end of lithium cell package.
As shown in fig. 2, nine connection ports for connecting with a lithium battery pack are provided on an existing lithium battery charger, the charger collects voltages of each section of lithium battery in the lithium battery pack after being connected with the lithium battery pack through the nine connection ports, an overcharge voltage threshold is stored in the charger, when the voltage of a certain section of lithium battery is greater than the overcharge voltage threshold, it is indicated that the section of lithium battery is overcharged, and charging of the lithium battery pack is stopped at this time. The nine connection ports are respectively marked as C1, C2, C3, C4, ID, B1+, B2+, B1-and B2-, wherein the C1 is connected with a second common end of a double-pole double-throw switch of a second relay in the lithium battery pack, the C2 is connected with a first common end of a double-pole double-throw switch of the second relay in the lithium battery pack, the C3 is connected with a second common end of a double-pole double-throw switch of a first relay in the lithium battery pack, the C4 is connected with a first common end of a double-pole double-throw switch of a first relay in the lithium battery pack, the ID is connected with an overcharge detection control end of the lithium battery pack, the B1+ is connected with an anode of a first lithium battery pack of the lithium battery pack, the B2+ is connected with an anode of a second battery pack of the lithium battery pack, the B1-is connected with a cathode of the first lithium battery pack, and the B2-is connected with a cathode of the second battery pack of the lithium battery pack. When the lithium battery pack is charged, the charger outputs a control signal at the ID, the control signal enables the first common terminal and the first switching terminal and the second common terminal and the third switching terminal of the double-pole double-throw switch in the two relays and the first common terminal and the second switching terminal and the second common terminal and the fourth switching terminal to be alternately conducted, when the first common terminal and the first switching terminal, and the second common terminal and the third switching terminal of the double-pole double-throw switch in the two relays are conducted, the charger collects the voltage of 5 lithium batteries in the second lithium battery pack in the lithium battery pack, the overcharge detection is carried out on the second lithium battery pack, when the first common end and the second switching end as well as the second common end and the fourth switching end of the double-pole double-throw switch in the two relays are conducted, the charger collects the voltage of 5 lithium batteries in the first lithium battery pack in the lithium battery pack and carries out overcharge detection on the first lithium battery pack.
The existing charger alternately carries out overcharge detection on two lithium battery packs in a lithium battery pack, so that the lithium battery pack is frequently switched along with alternate detection of the charger in two relays in the lithium battery pack when charging, charging noise is high, loss of the two relays is accelerated by frequent switching, the service life of the lithium battery pack is finally shortened, and the risk of safety accidents is increased.
Disclosure of Invention
The utility model aims to solve the technical problem that a can not frequently carry out the switch switching, the noise of charging is less, and life is longer, can realize the safe lithium cell package that charges.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a lithium battery pack capable of realizing safe charging comprises two lithium battery packs and an overcharge detection switching circuit, wherein each lithium battery pack comprises 5 lithium batteries respectively, the anode of the 5 th lithium battery pack is used as the anode of the lithium battery pack, the anode of the j th lithium battery pack is connected with the cathode of the j +1 th lithium battery pack, j is 1,2,3 and 4, the cathode of the 1 st lithium battery pack is used as the cathode of the lithium battery pack, the two lithium battery packs are respectively called as a first lithium battery pack and a second lithium battery pack, the overcharge detection switching circuit comprises a single-pole double-throw switching circuit, a voltage conversion circuit, a first signal detection processing circuit and a filter circuit, the voltage conversion circuit is used for converting the anode voltage of the second lithium battery pack into a voltage larger than the overcharge voltage threshold of the single lithium battery stored in a charger, the filter circuit is used for filtering and outputting the positive electrode voltage of 5 lithium batteries in the first lithium battery pack, the first signal detection processing circuit is used for acquiring the positive electrode voltage of the 5 lithium batteries in the first lithium battery pack after being filtered by the filter circuit, judging whether any lithium battery in the first lithium battery pack is overcharged or not, and then outputting an overcharged signal or a non-overcharged signal based on a judgment result, the switch circuit is used for accessing a control signal output by a charger at an ID (identity) and a signal output by the first signal detection processing circuit, the switch circuit has a conducting state and a stopping state, the current state of the switch circuit is determined by the signal output by the first signal detection processing circuit, the single-pole double-throw switching circuit has a default state and an overcharged state, and when the single-pole double-throw switching circuit is in the default state, the single-pole double-throw switching circuit outputs the voltage of the positive pole of the 1 st lithium battery in the second lithium battery pack, when the single-pole double-throw switching circuit is in an overcharged state, the single-pole double-throw switching circuit outputs the voltage converted by the voltage conversion circuit, the initial state of the single-pole double-throw switching circuit is a default state, when a charger outputs a control signal for detecting the overcharge of the first lithium battery pack at ID, if the signal output by the first signal detection processing circuit is an overcharged signal, the switching circuit is in a conducting state, the control signal output by the charger controls the single-pole double-throw switching circuit to switch after passing through the switching circuit, so that the single-pole double-throw switching circuit is switched from the default state to the overcharged state, and the overcharged voltage output by the voltage conversion circuit is output, if the signal output by the first signal detection processing circuit is a non-overcharging signal, the switch circuit is in a cut-off state at the moment, and the single-pole double-throw switching circuit keeps a default state unchanged.
The overcharge detection switching circuit also comprises a second signal detection processing circuit and an output circuit, the output circuit outputs output signals with set magnitude in an initial state, the second signal detection processing circuit is used for acquiring the positive voltage of 5 lithium batteries in the first lithium battery pack after being filtered by the filter circuit and judging whether any one lithium battery in the first lithium battery pack is overcharged, when the overcharged lithium battery does not exist in the first lithium battery pack, the second signal detection processing circuit outputs a non-overcharge signal, the output signal of the output circuit keeps the set magnitude unchanged, when the overcharged lithium battery exists in the first lithium battery pack, the second signal detection processing circuit outputs an overcharge signal, and the output signal of the output circuit changes in magnitude, the charger can judge whether the first lithium battery pack is overcharged according to the output signal of the output circuit. This lithium cell package is through increasing second signal detection processing circuit and output circuit, can set up the control signal that can control the switching of single-pole double-throw switching circuit and obtain output circuit's output signal's control signal in the charger, when carrying out the overcharge detection to first lithium cell group, the charger exports two control signals that set up in turn, realizes the detection of overcharging through first signal detection processing circuit and second signal detection processing circuit in turn from this and judges, accords with the emergence single failure that new standard IEC 62841-1 provided to the charging safety nature of lithium cell package and charges the detection standard still safe.
The voltage conversion circuit comprises a first chip with model number ME6203, a first capacitor and a second capacitor, the 3 rd pin of the first chip is connected with one end of the first capacitor, the connection end of the first capacitor is the input end of the voltage conversion circuit, the input end of the voltage conversion circuit is connected with the anode of the second lithium battery pack, the 1 st pin of the first chip is connected with one end of the second capacitor, and the connecting end of the first chip is the output end of the voltage conversion circuit, the output end of the voltage conversion circuit is used for outputting the converted voltage, the other end of the first capacitor, the other end of the second capacitor and the No. 2 pin of the first chip are connected, the connecting end of the first capacitor and the No. 2 pin of the second capacitor is the grounding end of the voltage conversion circuit, and the grounding end of the voltage conversion circuit is connected with the negative electrode of the second lithium battery pack.
The single-pole double-throw switching circuit comprises a relay and a first diode, the relay comprises a coil and a single-pole double-throw switch, the single-pole double-throw switch is provided with a public end, a first switching end and a second switching end, the first switching end of the single-pole double-throw switch is the first input end of the single-pole double-throw switching circuit, the first input end of the single-pole double-throw switching circuit is connected with the voltage conversion circuit and is connected with the overcharge voltage, the second switching end of the single-pole double-throw switch is the second input end of the single-pole double-throw switching circuit, the second input end of the single-pole double-throw switching circuit is connected with the positive electrode of the 1 st lithium battery of the second lithium battery pack, the public end of the single-pole double-throw switch is the output end of the single-pole double-throw switching circuit, and the output end of the single-pole double-throw switching circuit is used for outputting the overcharge voltage or the positive electrode of the 1 st lithium battery of the second lithium battery pack The pole voltage, the one end of coil with the positive pole of first diode connect and its link do single-pole double-throw converting circuit's earthing terminal, single-pole double-throw converting circuit's earthing terminal be connected with the negative pole of second lithium cell group, the other end of coil with the negative pole of first diode connect and its link do single-pole double-throw converting circuit's control end, at initial state, single-pole double-throw converting circuit's public end switch and second switching end switch on, work as single-pole double-throw converting circuit's control end insert the charger when the ID output carries out the control signal that overcharges the detection at first lithium cell group, single-pole double-throw converting circuit's public end switch over to switch on with first switching end.
The switch circuit comprises a first MOS tube, a first resistor, a second resistor and a second diode, wherein the drain electrode of the first MOS tube is a first connecting end of the switch circuit, the first connecting end of the switch circuit is connected with the single-pole double-throw switching circuit, the source electrode of the first MOS tube is connected with one end of the second resistor, the connecting end of the first MOS tube is a second connecting end of the switch circuit, the second connecting end of the switch circuit is used for accessing a control signal output by a charger at an ID (identity), the grid electrode of the first MOS tube, the other end of the second resistor are connected with one end of the first resistor, the other end of the first resistor is connected with the anode of the second diode, the cathode of the second diode is a control end of the switch circuit, and the control end of the switch circuit is connected with the first signal detection processing circuit, and accessing the overcharge signal or the non-overcharge signal output by the first signal detection processing circuit.
The first signal detection processing circuit comprises a second chip with the model of CW1051, wherein the 1 st pin of the second chip is a power supply end of the first signal detection processing circuit and is used for accessing working voltage, the 2 nd pin of the second chip is a first input end of the first signal detection processing circuit and is used for accessing the positive electrode voltage of the 5 th lithium battery in the first lithium battery pack filtered by the filter circuit, the 3 rd pin of the second chip is a second input end of the first signal detection processing circuit and is used for accessing the positive electrode voltage of the 4 th lithium battery in the first lithium battery pack filtered by the filter circuit, the 4 th pin of the second chip is a third input end of the first signal detection processing circuit and is used for accessing the positive electrode voltage of the 3 rd lithium battery in the first lithium battery pack filtered by the filter circuit, the 5 th pin of the second chip is the fourth input end of the first signal detection processing circuit, used for accessing the positive electrode voltage of the 2 nd lithium battery in the first lithium battery pack after being filtered by the filter circuit, the 6 th pin of the second chip is the fifth input end of the first signal detection processing circuit, used for connecting the positive electrode voltage of the 1 st lithium battery in the first lithium battery pack filtered by the filter circuit, the 7 th pin of the second chip is the grounding end of the first signal detection processing circuit, the grounding end of the first signal detection processing circuit is connected with the negative electrode of the first lithium battery pack, the 8 th pin of the second chip is the output end of the first signal detection processing circuit, and the output end of the first signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
The filter circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor, one end of the third resistor is connected with the anode of the first lithium battery pack, the other end of the third resistor is connected with one end of the third capacitor, the other end of the third capacitor is connected with the cathode of the first lithium battery pack, one end of the fourth resistor is connected with the anode of the first lithium battery pack, the other end of the fourth resistor and one end of the fourth capacitor, and the connection end of the fourth resistor and one end of the fourth capacitor is the first output end of the filter circuit, the first output end of the filter circuit is used for outputting the anode voltage of the 5 th lithium battery of the first lithium battery pack after filtering, one end of the fifth resistor is connected with the anode of the 4 th lithium battery of the first lithium battery pack, the other end of the fifth resistor, one end of the fifth capacitor and the connecting end of the fifth capacitor are the second output end of the filter circuit, the second output end of the filter circuit is used for outputting the positive voltage of the 4 th lithium battery of the first filtered lithium battery pack, one end of the sixth resistor is connected with the positive electrode of the 3 rd lithium battery of the first filtered lithium battery pack, the other end of the sixth resistor, one end of the sixth capacitor and the connecting end of the sixth capacitor are the third output end of the filter circuit, the third output end of the filter circuit is used for outputting the positive voltage of the 3 rd lithium battery of the first filtered lithium battery pack, one end of the seventh resistor is connected with the positive electrode of the 2 nd lithium battery of the first lithium battery pack, the other end of the seventh resistor, one end of the seventh capacitor and the connecting end of the seventh capacitor are the fourth output end of the filter circuit, the fourth output end of the filter circuit is used for outputting the filtered positive voltage of the 2 nd lithium battery of the first lithium battery pack, one end of the eighth resistor is connected with the positive electrode of the 1 st lithium battery of the first lithium battery pack, the other end of the eighth resistor and one end of the eighth capacitor, and the connecting end of the eighth resistor and one end of the eighth capacitor is the fifth output end of the filter circuit, the fifth output end of the filter circuit is used for outputting the filtered positive voltage of the 1 st lithium battery of the first lithium battery pack, the other end of the fourth capacitor is connected with one end of the fifth capacitor, the other end of the fifth capacitor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the seventh capacitor, the other end of the seventh capacitor is connected with one end of the eighth capacitor, and the other end of the eighth capacitor is connected with the negative electrode of the first lithium battery pack.
The second signal detection processing circuit comprises a third chip with the model of CW1051, wherein the 1 st pin of the third chip is a power supply end of the second signal detection processing circuit and is used for accessing working voltage, the 2 nd pin of the third chip is a first input end of the second signal detection processing circuit and is used for accessing the positive voltage of the 5 th lithium battery in the first lithium battery pack filtered by the filter circuit, the 3 rd pin of the third chip is a second input end of the second signal detection processing circuit and is used for accessing the positive voltage of the 4 th lithium battery in the first lithium battery pack filtered by the filter circuit, the 4 th pin of the third chip is a third input end of the second signal detection processing circuit and is used for accessing the positive voltage of the 3 rd lithium battery in the first lithium battery pack filtered by the filter circuit, the 5 th pin of the third chip is the fourth input end of the second signal detection processing circuit, used for accessing the positive electrode voltage of the 2 nd lithium battery in the first lithium battery pack after being filtered by the filter circuit, the 6 th pin of the third chip is the fifth input end of the second signal detection processing circuit, used for connecting the positive electrode voltage of the 1 st lithium battery in the first lithium battery pack filtered by the filter circuit, the 7 th pin of the third chip is the grounding end of the second signal detection processing circuit, the grounding end of the second signal detection processing circuit is connected with the negative electrode of the first lithium battery pack, the 8 th pin of the third chip is the output end of the second signal detection processing circuit, and the output end of the second signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
The output circuit comprises a ninth resistor, a tenth resistor and a third diode, one end of the ninth resistor is connected with one end of the tenth resistor, the connection end of the ninth resistor is connected with the output end of the output circuit, the output end of the ninth resistor is used for outputting an output signal, the other end of the tenth resistor is connected with the negative electrode of the second lithium battery pack, the other end of the ninth resistor is connected with the positive electrode of the third diode, the negative electrode of the third diode is the input end of the output circuit, and the third diode is used for being connected with an overcharge signal or a non-overcharge signal output by the second signal detection processing circuit.
Compared with the prior art, the utility model has the advantages that the overcharge detection switching circuit is constructed by the single-pole double-throw switching circuit, the switch circuit, the voltage conversion circuit, the first signal detection processing circuit and the filter circuit, the voltage conversion circuit converts the anode voltage of the second lithium battery pack into a voltage which is larger than the overcharge voltage threshold value of the single lithium battery stored in the charger and represents that any one lithium battery is overcharged in the first lithium battery pack, the filter circuit is used for outputting the anode voltage of 5 lithium batteries in the first lithium battery pack after being subjected to filter pressing, the first signal detection processing circuit is used for acquiring the anode voltage of 5 lithium batteries in the first lithium battery pack after being filtered by the filter circuit, judging whether any one lithium battery is overcharged in the first lithium battery pack or not, then outputting an overcharge signal or a non-overcharge signal based on the judgment result, the switch circuit is used for accessing a control signal output by the charger at ID and a signal output by the first signal detection processing circuit, the switch circuit has a conducting state and a cut-off state, the current state of the switch circuit is determined by the signal output by the first signal detection processing circuit, the single-pole double-throw switching circuit has a default state and an overcharged state, when the single-pole double-throw switching circuit is in the default state, the single-pole double-throw switching circuit outputs the positive electrode voltage of the 1 st lithium battery in the second lithium battery pack, when the single-pole double-throw switching circuit is in the overcharged state, the single-pole double-throw switching circuit outputs the overcharged voltage output by the voltage conversion circuit, the initial state of the single-pole double-throw switching circuit is the default state, when the charger outputs the control signal for detecting overcharging of the first lithium battery pack at ID, if the signal output by the first signal detection processing circuit is the overcharged signal, the switch circuit is in the conducting state, the control signal output by the charger controls the single-pole double-throw switching circuit to switch after passing through the switch circuit, the single-pole double-throw switching circuit is switched from a default state to an overcharged state, the voltage converted by the voltage conversion circuit is output, the charger can judge that the first lithium battery pack is overcharged according to the overcharged voltage output by the voltage conversion circuit, if the signal output by the first signal detection processing circuit is a non-overcharged signal, the switch circuit is in an off state, the single-pole double-throw switching circuit keeps the default state unchanged, when the charger charges the lithium battery pack of the utility model, C1 is connected with the single-pole double-throw switch, C2 is connected with the anode of the 2 nd lithium battery of the second lithium battery pack, C3 is connected with the anode of the 3 rd lithium battery of the second lithium battery pack, C4 is connected with the anode of the 4 th lithium battery of the second lithium battery pack, ID is connected with the switch circuit, B1+ is connected with the anode of the first lithium battery pack, B2+ is connected with the anode of the second lithium battery pack, b1-is connected with the negative pole of the first lithium battery pack, B2-is connected with the negative pole of the second lithium battery pack, when the first lithium battery pack is overcharged, the charger outputs a control signal under ID, if the signal output by the first signal detection processing circuit is an overcharging signal at the moment, the switch circuit is in a conducting state, the control signal reaches the single-pole double-throw switching circuit through the switch circuit, the single-pole double-throw switching circuit is controlled to carry out switch switching, the overcharging voltage is output, therefore, the charger can judge that the first lithium battery pack is overcharged when receiving the overcharging voltage, the lithium battery pack is stopped being charged, the overcharge protection is realized, if the signal output by the first signal detection processing circuit is a non-overcharging signal at the moment, the switch circuit is in a stopping state, even if the charger outputs the control signal under ID at the moment, the control signal can not reach the single-pole double-throw switching circuit, the single-pole double-throw switching circuit keeps the original state unchangeable, from this the utility model discloses a single-pole double-throw switching circuit, switch circuit, voltage conversion circuit, the overcharge that first signal detection processing circuit and filter circuit found detects two relays among the switching circuit replacement prior art, on the basis of compatible original charger, only just switch over when first lithium cell group exists overcharge, can not frequently carry out switch over, charging noise can be ignored, improve the life of lithium cell package, reduce the risk of taking place the incident.
Drawings
Fig. 1 is a circuit diagram of a conventional lithium battery pack;
FIG. 2 is a schematic diagram of a connection port for connecting a conventional charger to a lithium battery pack;
fig. 3 is a block diagram of a first embodiment of a lithium battery pack capable of realizing safe charging according to the present invention;
fig. 4 is a block diagram of a second embodiment of the lithium battery pack of the present invention, which can realize safe charging;
fig. 5 is a circuit diagram of a second embodiment of the lithium battery pack of the present invention capable of realizing safe charging.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows: as shown in fig. 3, a lithium battery pack capable of realizing safe charging includes two lithium battery packs and an overcharge detection switching circuit, each lithium battery pack includes 5 lithium batteries, the positive electrode of the 5 th lithium battery pack is used as the positive electrode of the lithium battery pack, the positive electrode of the j th lithium battery pack is connected with the negative electrode of the j +1 th lithium battery pack, j is 1,2,3,4, the negative electrode of the 1 st lithium battery pack is used as the negative electrode of the lithium battery pack, the two lithium battery packs are respectively called a first lithium battery pack BT1 and a second lithium battery pack BT2, the overcharge detection switching circuit includes a single-pole double-throw switching circuit, a voltage conversion circuit, a first signal detection processing circuit and a filter circuit, the voltage conversion circuit is used for converting the positive electrode voltage of the second lithium battery pack into a voltage larger than the overcharge voltage threshold of the single lithium battery pack stored in the charger, the filter circuit is used for filter-pressing and outputting the positive electrode voltage of the 5 th lithium battery pack 1, the first signal detection processing circuit is used for acquiring the positive voltage of 5 lithium batteries in the first lithium battery pack after being filtered by the filter circuit, judging whether overcharged lithium batteries exist in the first lithium battery pack BT1 or not, outputting an overcharging signal or a non-overcharging signal based on a judgment result, the switch circuit is used for accessing a control signal output by the charger at the ID and a signal output by the first signal detection processing circuit, the switch circuit has a conducting state and a stopping state, the current state of the switch circuit is determined by the current signal output by the first signal detection processing circuit, the single-pole double-throw switching circuit has a default state and an overcharging state, when the single-pole double-throw switching circuit is in the default state, the single-pole double-throw switching circuit outputs the positive voltage of the 1 lithium battery in the second lithium battery pack BT2, and when the single-pole double-throw switching circuit is in the overcharging state, the single-pole double-throw switching circuit outputs the overcharging voltage output by the voltage conversion circuit, the initial state of the single-pole double-throw switching circuit is a default state, when the charger outputs a control signal for detecting overcharge of the first lithium battery BT1 at the ID, if the signal output by the first signal detection processing circuit is an overcharge signal, the switching circuit is in a conducting state at the moment, the control signal output by the charger controls the single-pole double-throw switching circuit to switch after passing through the switching circuit, so that the single-pole double-throw switching circuit is switched from the default state to the overcharge state, the voltage converted by the voltage conversion circuit is output, and if the signal output by the first signal detection processing circuit is a non-overcharge signal, the switching circuit is in a cut-off state at the moment, and the single-pole double-throw switching circuit keeps the default state unchanged.
Example two: as shown in fig. 4, the present embodiment is different from the first embodiment in that: in this embodiment, the overcharge detection switching circuit further includes a second signal detection processing circuit and an output circuit, the output circuit outputs an output signal with a set magnitude in an initial state, the second signal detection processing circuit is configured to obtain the positive voltage of 5 lithium batteries in the first lithium battery pack BT1 filtered by the filter circuit, determine whether overcharged lithium batteries exist in the first lithium battery pack BT1, when the overcharged lithium battery does not exist in the first lithium battery set BT1, the second signal detection processing circuit outputs a non-overcharging signal, the output signal of the output circuit keeps the set size unchanged, when the overcharged lithium battery exists in the first lithium battery pack BT1, the second signal detection processing circuit outputs an overcharging signal, the output signal of the output circuit changes, and the charger can judge whether the first lithium battery pack BT1 is overcharged according to the output signal of the output circuit.
As shown in fig. 5, in this embodiment, the voltage conversion circuit includes a first chip U1, a first capacitor C1, and a second capacitor C2, where the 3 rd pin of the first chip U1 is connected to one end of the first capacitor C1, and the connection end thereof is an input end of the voltage conversion circuit, the input end of the voltage conversion circuit is connected to the positive electrode of the second lithium battery BT2, the 1 st pin of the first chip U1 is connected to one end of the second capacitor C2, and the connection end thereof is an output end of the voltage conversion circuit, the output end of the voltage conversion circuit is used for the converted voltage, the other end of the first capacitor C1, the other end of the second capacitor C2 is connected to the 2 nd pin of the first chip U1, and the connection end thereof is a ground end of the voltage conversion circuit, and the ground end of the voltage conversion circuit is connected to the negative electrode of the second lithium battery BT 2. The nominal voltage of each lithium battery in the first lithium battery group BT1 is generally 3.6V, and the overcharge voltage output by the voltage conversion circuit is 4.4V, which is absolutely greater than the general overcharge voltage of each lithium battery in the first lithium battery group BT1, namely 4.2V.
As shown in fig. 5, in this embodiment, the single-pole double-throw switching circuit includes a relay K1 and a first diode D1, the relay K1 includes a coil and a single-pole double-throw switch, the single-pole double-throw switch has a common terminal, a first switching terminal and a second switching terminal, the first switching terminal of the single-pole double-throw switch is a first input terminal of the single-pole double-throw switching circuit, the first input terminal of the single-pole double-throw switching circuit is connected to the voltage converting circuit and is connected to the overcharge voltage, the second switching terminal of the single-pole double-throw switch is a second input terminal of the single-pole double-throw switching circuit, the second input terminal of the single-pole double-throw switching circuit is connected to the positive electrode of the 1 st lithium battery of the second lithium battery BT2, the common terminal of the single-pole double-throw switching circuit is an output terminal of the single-pole double-throw switching circuit, the output terminal of the single-pole double-throw switching circuit is used for outputting the overcharge voltage or the positive electrode voltage of the 1 st, one end of the coil is connected with the anode of the first diode D1, the connecting end of the coil is the grounding end of the single-pole double-throw switching circuit, the grounding end of the single-pole double-throw switching circuit is connected with the cathode of the second lithium battery group BT2, the other end of the coil is connected with the cathode of the first diode D1, the connecting end of the coil is the control end of the single-pole double-throw switching circuit, in an initial state, the common end of the single-pole double-throw switching circuit is conducted with the second switching end, and when the control end of the single-pole double-throw switching circuit is connected with a control signal which is output by a charger at an ID and used for carrying out overcharge detection on the first lithium battery group BT1, the common end of the single-pole double-throw switching circuit is switched.
As shown in fig. 5, in this embodiment, the switch circuit includes a first MOS transistor Q1, a first resistor R1, the charging circuit comprises a second resistor R2 and a second diode D2, the drain of a first MOS transistor Q1 is a first connection end of the switching circuit, the first connection end of the switching circuit is connected with the single-pole double-throw switching circuit, the source of the first MOS transistor Q1 is connected with one end of a second resistor R2, the connection end of the first MOS transistor Q1 is a second connection end of the switching circuit, the second connection end of the switching circuit is used for connecting a control signal output by the charger at the ID, the grid of the first MOS transistor Q1 and the other end of the second resistor R2 are connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with the anode of a second diode D2, the cathode of the second diode D2 is a control end of the switching circuit, and the control end of the switching circuit is connected with a first signal detection processing circuit and is connected with an overcharge signal or a non-overcharge signal output by the first signal detection processing circuit.
As shown in fig. 5, in this embodiment, the first signal detection processing circuit includes a second chip U2 with the type CW1051, a pin 1 of the second chip U2 is a power supply terminal of the first signal detection processing circuit and is used for accessing an operating voltage, a pin 2 of the second chip U2 is a first input terminal of the first signal detection processing circuit and is used for accessing a positive voltage of a lithium battery of the section 5 in the first lithium battery pack BT1 filtered by the filter circuit, a pin 3 of the second chip U2 is a second input terminal of the first signal detection processing circuit and is used for accessing a positive voltage of a lithium battery of the section 4 in the first lithium battery pack BT1 filtered by the filter circuit, a pin 4 of the second chip U2 is a third input terminal of the first signal detection processing circuit and is used for accessing a positive voltage of a lithium battery of the section 3 in the first battery pack BT1 filtered by the filter circuit, a pin 5 of the second chip U2 is a fourth input terminal of the first signal detection processing circuit, the second chip U2 is a fifth input end of the first signal detection processing circuit and is used for accessing the positive voltage of the 2 nd lithium battery in the first lithium battery pack BT1 filtered by the filter circuit, the 6 th pin of the second chip U2 is a fifth input end of the first signal detection processing circuit and is used for accessing the positive voltage of the 1 st lithium battery in the first lithium battery pack BT1 filtered by the filter circuit, the 7 th pin of the second chip U2 is a grounding end of the first signal detection processing circuit, the grounding end of the first signal detection processing circuit is connected with a negative electrode of the first lithium battery pack BT1, the 8 th pin of the second chip U2 is an output end of the first signal detection processing circuit, and the output end of the first signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
As shown in fig. 5, in the present embodiment, the filter circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8, one end of the third resistor R3 is connected to the positive electrode of the first lithium battery BT1, the other end of the third resistor R3 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is connected to the negative electrode of the first lithium battery BT1, one end of the fourth resistor R4 is connected to the positive electrode of the first lithium battery BT1, the other end of the fourth resistor R4 is connected to one end of the fourth capacitor C4, and the connection end of the fourth resistor R4 is a first output end of the filter circuit, a first output end of the filter circuit is used for outputting the positive voltage of the first BT battery BT 847 of the filter circuit, and the positive electrode 1 of the first lithium battery BT 58 is connected to the first lithium battery BT 8744, the other end of the fifth resistor R5 and one end of the fifth capacitor C5 are connected to form a second output end of the filter circuit, the second output end of the filter circuit is used for outputting the filtered positive voltage of the 4 th lithium battery of the first lithium battery pack BT1, one end of the sixth resistor R6 is connected to the positive electrode of the 3 rd lithium battery of the first lithium battery pack BT1, the other end of the sixth resistor R6 and one end of the sixth capacitor C6 are connected to form a third output end of the filter circuit, the third output end of the filter circuit is used for outputting the filtered positive voltage of the 3 rd lithium battery of the first lithium battery pack BT1, one end of the seventh resistor R7 is connected to the positive electrode of the 2 nd lithium battery of the first lithium battery pack BT1, the other end of the seventh resistor R7 and one end of the seventh capacitor C7 are connected to form a fourth output end of the filter circuit, and the fourth output end of the filter circuit is used for outputting the filtered positive voltage of the 2 nd lithium battery of the first lithium battery pack BT1, one end of an eighth resistor R8 is connected with the positive electrode of the 1 st lithium battery of the first lithium battery pack BT1, the other end of the eighth resistor R8 is connected with one end of an eighth capacitor C8, and the connection end of the eighth resistor R8 is a fifth output end of a filter circuit, the fifth output end of the filter circuit is used for outputting the filtered positive electrode voltage of the 1 st lithium battery of the first lithium battery pack BT1, the other end of a fourth capacitor C4 is connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is connected with one end of a sixth capacitor C6, the other end of a sixth capacitor C6 is connected with one end of a seventh capacitor C7, the other end of a seventh capacitor C7 is connected with one end of the eighth capacitor C8, and the other end of the eighth capacitor C8 is connected with the negative electrode of the first lithium battery pack BT 1.
As shown in fig. 5, in this embodiment, the second signal detection processing circuit includes a third chip U3 with the model number CW1051, a pin 1 of the third chip U3 is a power supply terminal of the second signal detection processing circuit and is used for accessing an operating voltage, a pin 2 of the third chip U3 is a first input terminal of the second signal detection processing circuit and is used for accessing a positive electrode voltage of a lithium battery of a section 5 in the first lithium battery pack BT1 filtered by the filter circuit, a pin 3 of the third chip U3 is a second input terminal of the second signal detection processing circuit and is used for accessing a positive electrode voltage of a lithium battery of a section 4 in the first lithium battery pack BT1 filtered by the filter circuit, a pin 4 of the third chip U3 is a third input terminal of the second signal detection processing circuit and is used for accessing a positive electrode voltage of a lithium battery of a section 3 in the first lithium battery pack BT1 filtered by the filter circuit, and a pin 5 of the third chip U3 is a fourth input terminal of the second signal detection processing circuit, the power supply circuit is used for accessing the positive voltage of the 2 nd lithium battery in the first lithium battery pack BT1 filtered by the filter circuit, the 6 th pin of the third chip U3 is the fifth input end of the second signal detection processing circuit and is used for accessing the positive voltage of the 1 st lithium battery in the first lithium battery pack BT1 filtered by the filter circuit, the 7 th pin of the third chip U3 is the grounding end of the second signal detection processing circuit, the grounding end of the second signal detection processing circuit is connected with the negative electrode of the first lithium battery pack BT1, the 8 th pin of the third chip U3 is the output end of the second signal detection processing circuit, and the output end of the second signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
As shown in fig. 5, in this embodiment, the output circuit includes a ninth resistor R9, a tenth resistor R10, and a third diode D3, one end of the ninth resistor R9 is connected to one end of the tenth resistor R10, and a connection end of the ninth resistor R9 is an output end of the output circuit, and is used for outputting an output signal, another end of the tenth resistor R10 is connected to a negative electrode of the second lithium battery BT2, another end of the ninth resistor R9 is connected to an anode of the third diode D3, and a cathode of the third diode D3 is an input end of the output circuit, and is used for accessing an overcharge signal or a non-overcharge signal output by the second signal detection processing circuit.
Claims (9)
1. A lithium battery pack capable of realizing safe charging comprises two lithium battery packs and an overcharge detection switching circuit, wherein each lithium battery pack comprises 5 lithium batteries connected in series, the anode of the 5 th lithium battery is used as the anode of the lithium battery pack, the anode of the j th lithium battery is connected with the cathode of the j +1 th lithium battery, j is 1,2,3,4, the cathode of the 1 st lithium battery is used as the cathode of the lithium battery pack, the two lithium battery packs are respectively called a first lithium battery pack and a second lithium battery pack, the overcharge detection switching circuit comprises a single-pole double-throw switching circuit, a voltage conversion circuit, a first signal detection processing circuit and a filter circuit, the voltage conversion circuit is used for converting the anode voltage of the second lithium battery pack into a voltage larger than the overcharge voltage threshold of the single lithium battery stored in a charger, the filter circuit is used for filtering and outputting the positive electrode voltage of 5 lithium batteries in the first lithium battery pack, the first signal detection processing circuit is used for acquiring the positive electrode voltage of the 5 lithium batteries in the first lithium battery pack after being filtered by the filter circuit, judging whether any lithium battery in the first lithium battery pack is overcharged or not, and then outputting an overcharged signal or a non-overcharged signal based on a judgment result, the switch circuit is used for connecting a control signal output by a charger at an ID (identity) and a signal output by the first signal detection processing circuit, the switch circuit has a conducting state and a stopping state, the current state of the switch circuit is determined by the signal output by the first signal detection processing circuit, the single-pole double-throw switching circuit has a default state and an overcharged state, and when the single-pole double-throw switching circuit is in the default state, the single-pole double-throw switching circuit outputs the voltage of the positive pole of the 1 st lithium battery in the second lithium battery pack, when the single-pole double-throw switching circuit is in an overcharged state, the single-pole double-throw switching circuit outputs the voltage converted by the voltage conversion circuit, the initial state of the single-pole double-throw switching circuit is a default state, when a charger outputs a control signal for detecting overcharge of the first lithium battery pack at ID, if the signal output by the first signal detection processing circuit is an overcharged signal, the switching circuit is in a conducting state, the control signal output by the charger controls the single-pole double-throw switching circuit to switch after passing through the switching circuit, so that the single-pole double-throw switching circuit is switched from the default state to the overcharged state, the voltage converted by the voltage conversion circuit is output, and if the signal output by the first signal detection processing circuit is a non-overcharged signal, at this time, the switch circuit is in an off state, and the single-pole double-throw switching circuit keeps a default state unchanged.
2. The lithium battery pack capable of realizing safe charging according to claim 1, wherein the overcharge detection switching circuit further comprises a second signal detection processing circuit and an output circuit, the output circuit outputs an output signal with a predetermined magnitude in an initial state, the second signal detection processing circuit is configured to obtain the positive voltage of 5 lithium batteries in the first lithium battery pack filtered by the filter circuit and determine whether there is overcharge of any lithium battery in the first lithium battery pack, when there is no overcharged lithium battery in the first lithium battery pack, the second signal detection processing circuit outputs a non-overcharge signal, when the output signal of the output circuit keeps the predetermined magnitude, when there is overcharge of any lithium battery in the first lithium battery pack, the second signal detection processing circuit outputs an overcharge signal, at the moment, the output signal of the output circuit changes, and the charger can judge whether the first lithium battery pack is overcharged according to the output signal of the output circuit.
3. The lithium battery pack capable of realizing safe charging according to claim 1 or 2, wherein the voltage converting circuit comprises a first chip with model number ME6203, a first capacitor and a second capacitor, pin 3 of the first chip is connected to one end of the first capacitor, and the connection end thereof is the input end of the voltage converting circuit, the input end of the voltage converting circuit is connected to the positive electrode of the second lithium battery pack, pin 1 of the first chip is connected to one end of the second capacitor, and the connection end thereof is the output end of the voltage converting circuit, the output end of the voltage converting circuit is used for outputting the converted voltage, the other end of the first capacitor, the other end of the second capacitor is connected to pin 2 of the first chip, and the connection end thereof is the ground end of the voltage converting circuit, and the grounding end of the voltage conversion circuit is connected with the negative electrode of the second lithium battery pack.
4. The lithium battery pack capable of realizing safe charging according to claim 1 or 2, wherein the single-pole double-throw switching circuit comprises a relay and a first diode, the relay comprises a coil and a single-pole double-throw switch, the single-pole double-throw switch has a common terminal, a first switching terminal and a second switching terminal, the first switching terminal of the single-pole double-throw switch is a first input terminal of the single-pole double-throw switching circuit, a first input terminal of the single-pole double-throw switching circuit is connected with the voltage converting circuit to switch in the overcharge voltage, a second switching terminal of the single-pole double-throw switch is a second input terminal of the single-pole double-throw switching circuit, a second input terminal of the single-pole double-throw switching circuit is connected with an anode of a 1 st lithium battery of a second battery pack, and the common terminal of the single-pole double-throw switch is an output terminal of the single-pole double-throw switching circuit, the output end of the single-pole double-throw switching circuit is used for outputting the overcharge voltage or the positive voltage of the 1 st lithium battery in the second lithium battery pack, one end of the coil is connected with the anode of the first diode, and the connecting end of the coil is the grounding end of the single-pole double-throw switching circuit, the grounding end of the single-pole double-throw switching circuit is connected with the negative electrode of the second lithium battery pack, the other end of the coil is connected with the cathode of the first diode, the connecting end of the coil is the control end of the single-pole double-throw switching circuit, in an initial state, the common end of the single-pole double-throw switching circuit is conducted with the second switching end, and when the control end of the single-pole double-throw switching circuit is connected with a control signal which is output by a charger at an ID and used for carrying out overcharge detection on the first lithium battery pack, the common end of the single-pole double-throw switching circuit is switched to be conducted with the first switching end.
5. The lithium battery pack capable of realizing safe charging according to claim 1 or 2, wherein the switch circuit comprises a first MOS transistor, a first resistor, a second resistor and a second diode, a drain of the first MOS transistor is a first connection end of the switch circuit, the first connection end of the switch circuit is connected to the single-pole double-throw switching circuit, a source of the first MOS transistor is connected to one end of the second resistor, a connection end of the first MOS transistor is a second connection end of the switch circuit, the second connection end of the switch circuit is used for receiving a control signal output by a charger at an ID, a gate of the first MOS transistor, the other end of the second resistor is connected to one end of the first resistor, the other end of the first resistor is connected to an anode of the second diode, and a cathode of the second diode is a control end of the switch circuit, the control end of the switch circuit is connected with the first signal detection processing circuit and is connected to the overcharge signal or the non-overcharge signal output by the first signal detection processing circuit.
6. The lithium battery pack capable of realizing safe charging according to claim 1 or 2, wherein the first signal detection processing circuit includes a second chip with a model number CW1051, a pin 1 of the second chip is a power supply terminal of the first signal detection processing circuit for accessing an operating voltage, a pin 2 of the second chip is a first input terminal of the first signal detection processing circuit for accessing a positive voltage of a 5 th lithium battery in the first lithium battery pack filtered by the filter circuit, a pin 3 of the second chip is a second input terminal of the first signal detection processing circuit for accessing a positive voltage of a 4 th lithium battery in the first lithium battery pack filtered by the filter circuit, a pin 4 of the second chip is a third input terminal of the first signal detection processing circuit, the second chip has a pin 5 as a fourth input terminal of the first signal detection processing circuit, and is configured to access a positive voltage of a lithium battery of the first lithium battery pack filtered by the filter circuit, a pin 6 as a fifth input terminal of the first signal detection processing circuit, and is configured to access a positive voltage of a lithium battery of the first lithium battery pack filtered by the filter circuit, a pin 7 as a ground terminal of the first signal detection processing circuit, a ground terminal of the first signal detection processing circuit being connected to a negative terminal of the first lithium battery pack, and a pin 8 as an output terminal of the first signal detection processing circuit, the output end of the first signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
7. The lithium battery pack capable of realizing safe charging according to claim 1, wherein the filter circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor, one end of the third resistor is connected to a positive electrode of the first lithium battery pack, the other end of the third resistor is connected to one end of the third capacitor, the other end of the third capacitor is connected to a negative electrode of the first lithium battery pack, one end of the fourth resistor is connected to a positive electrode of the first lithium battery pack, the other end of the fourth resistor and one end of the fourth capacitor are connected to a first output end of the filter circuit, and the first output end of the filter circuit is used for outputting a filtered positive electrode voltage of the 5 th lithium battery pack of the first battery pack, one end of the fifth resistor is connected with the positive electrode of the 4 th lithium battery of the first lithium battery pack, the other end of the fifth resistor, one end of the fifth capacitor and the connecting end of the fifth resistor are the second output end of the filter circuit, the second output end of the filter circuit is used for outputting the positive electrode voltage of the 4 th lithium battery of the first lithium battery pack after filtering, one end of the sixth resistor is connected with the positive electrode of the 3 rd lithium battery of the first lithium battery pack, the other end of the sixth resistor, one end of the sixth capacitor and the connecting end of the sixth capacitor are the third output end of the filter circuit, the third output end of the filter circuit is used for outputting the positive electrode voltage of the 3 rd lithium battery of the first lithium battery pack after filtering, one end of the seventh resistor is connected with the positive electrode of the 2 nd lithium battery of the first lithium battery pack, and the other end of the seventh resistor, one end of the seventh capacitor and the connecting end of the seventh capacitor are the filter circuit A fourth output terminal of the filter circuit, wherein the fourth output terminal of the filter circuit is used for outputting the filtered positive voltage of the 2 nd lithium battery of the first lithium battery pack, one end of the eighth resistor is connected with the positive electrode of the 1 st lithium battery of the first lithium battery pack, the other end of the eighth resistor and one end of the eighth capacitor, and the connection end of the eighth resistor and one end of the eighth capacitor is the fifth output terminal of the filter circuit, the fifth output terminal of the filter circuit is used for outputting the filtered positive voltage of the 1 st lithium battery of the first lithium battery pack, the other end of the fourth capacitor is connected with one end of the fifth capacitor, the other end of the fifth capacitor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the seventh capacitor, and the other end of the seventh capacitor is connected with one end of the eighth capacitor, the other end of the eighth capacitor is connected with the negative electrode of the first lithium battery pack.
8. The lithium battery pack capable of realizing safe charging according to claim 2, wherein the second signal detection processing circuit includes a third chip with a type CW1051, a pin 1 of the third chip is a power supply terminal of the second signal detection processing circuit for accessing an operating voltage, a pin 2 of the third chip is a first input terminal of the second signal detection processing circuit for accessing a positive voltage of a lithium battery of a section 5 in the first lithium battery pack filtered by the filter circuit, a pin 3 of the third chip is a second input terminal of the second signal detection processing circuit for accessing a positive voltage of a lithium battery of a section 4 in the first lithium battery pack filtered by the filter circuit, a pin 4 of the third chip is a third input terminal of the second signal detection processing circuit, the voltage detection circuit is used for receiving the positive voltage of the 3 rd lithium battery in the first lithium battery pack filtered by the filter circuit, the pin 5 of the third chip is the fourth input end of the second signal detection processing circuit and is used for receiving the positive voltage of the 2 nd lithium battery in the first lithium battery pack filtered by the filter circuit, the pin 6 of the third chip is the fifth input end of the second signal detection processing circuit and is used for receiving the positive voltage of the 1 st lithium battery in the first lithium battery pack filtered by the filter circuit, the pin 7 of the third chip is the grounding end of the second signal detection processing circuit, the grounding end of the second signal detection processing circuit is connected with the negative electrode of the first lithium battery pack, and the pin 8 of the third chip is the output end of the second signal detection processing circuit, the output end of the second signal detection processing circuit is used for outputting an overcharge signal or a non-overcharge signal.
9. The lithium battery pack capable of realizing safe charging according to claim 2, wherein the output circuit comprises a ninth resistor, a tenth resistor and a third diode, one end of the ninth resistor is connected with one end of the tenth resistor, and the connection end of the ninth resistor is the output end of the output circuit for outputting an output signal, the other end of the tenth resistor is connected with the negative electrode of the second lithium battery pack, the other end of the ninth resistor is connected with the anode of the third diode, and the cathode of the third diode is the input end of the output circuit for accessing the overcharge signal or the non-overcharge signal output by the second signal detection processing circuit.
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| CN114336864A (en) * | 2021-12-31 | 2022-04-12 | 宁波锂想电子有限公司 | Charger capable of realizing safe charging of lithium battery pack |
| CN114336864B (en) * | 2021-12-31 | 2024-03-29 | 宁波锂想电子有限公司 | Charger capable of realizing safe charging of lithium battery pack |
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