CN209560038U - A kind of maximum potential detection circuit of lithium battery group charge protector - Google Patents

A kind of maximum potential detection circuit of lithium battery group charge protector Download PDF

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Publication number
CN209560038U
CN209560038U CN201822056619.0U CN201822056619U CN209560038U CN 209560038 U CN209560038 U CN 209560038U CN 201822056619 U CN201822056619 U CN 201822056619U CN 209560038 U CN209560038 U CN 209560038U
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China
Prior art keywords
lithium battery
detection circuit
maximum potential
potential detection
charge protector
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CN201822056619.0U
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Chinese (zh)
Inventor
於锋
王金波
徐锦林
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Ningbo Li Li Electronics Co Ltd
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Ningbo Li Li Electronics Co Ltd
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Abstract

The utility model discloses a kind of maximum potential detection circuits of lithium battery group charge protector; including m resistance; m is the integer more than or equal to 2; one end of m resistance connects and its connecting pin is the input terminal of maximum potential detection circuit, and the other end of m resistance connects and its connecting pin is the output end of maximum potential detection circuit;Advantage is that the second protection chip that not will lead to lithium battery group charge protector erroneous judgement situation occurs, and judgement reliability of the lithium battery group charge protector under single failure conditions can be improved.

Description

A kind of maximum potential detection circuit of lithium battery group charge protector
Technical field
The utility model relates to a kind of potential detecting circuits, most more particularly, to a kind of lithium battery group charge protector High potential detection circuit.
Background technique
Lithium battery group charge protector is mainly used in the security protection in lithium battery group charging process.Lithium battery group by One section lithium battery group at perhaps connected by multisection lithium battery formed each section lithium battery be made of an independent lithium battery or It is formed by multiple lithium battery parallel connections.Just extremely its maximum potential end of lithium battery group, the cathode of lithium battery group are its potential minimum End.When charger charges to lithium battery group, lithium battery group charge protector passes through in lithium battery group in detection charging process It respectively saves the voltage signal of lithium battery and whether accordingly generate allows charging signals to be sent to charger, charger is according to lithium battery group The output signal of charge protector controls whether its charge inside circuit charges to lithium battery group.When lithium battery group charges The output signal for protecting circuit is when not allowing charging signals, and charger controls its charge inside circuit and lithium battery group disconnects, Stopping charges to lithium battery group, avoids lithium battery group from overcharging and leads to safety accident, when lithium battery group charge protector Output signal be allow charging signals when, charger controls its charge inside circuit and charges to lithium battery group.
With the fast development and the expansion of application field of lithium battery power supply industry, the safety of lithium battery group power supply is also obtained The extensive concern arrived.Currently, charger is controlled whether charging according to the output signal of lithium battery group charge protector.But It is lithium battery group caused by being malfunctioned due to output signal of lithium battery group charge protector itself in actual use Explosion accident is overcharged also to happen occasionally.For this purpose, being filled in industry to the reliability and lithium battery group of lithium battery group charge protector Higher requirements are also raised for the safety of electricity.At the same time, industry new standard IEC 62841-1 is directed to the charging of lithium battery group Safety is put forward new requirements: it is required that under lithium battery group charge protector single failure conditions, lithium battery group charger Protection circuit, which still can be generated and be exported, reliably overcharges judgement signal.
Existing lithium battery group charge protector generally includes n potential detecting circuit and decision circuit, and n is equal to lithium electricity The joint number for the lithium battery for including in group, specific structure are as shown in Figure 1.Decision circuit generally use model CW1051, BM3051, The similar second protection chip and its peripheral circuit of OZ2605 or S-8215 etc. is realized.Every section lithium battery is being just in lithium battery group Pole is connected by a potential detecting circuit with a voltage acquisition end of second protection chip, we will connect lithium battery group That potential detecting circuit of anode and second protection chip is known as maximum potential detection circuit, will be with maximum potential detection circuit One voltage acquisition end of the second protection chip of connection is known as ceiling voltage collection terminal.Maximum potential detection circuit includes at present One resistance, circuit diagram is as shown in Fig. 2, the anode of lithium battery group passes through this with the ceiling voltage collection terminal of second protection chip Resistance connection.It could be theoretically argued that lithium battery group is filled at this time when open circuit conditions occurs in the resistance failure of any potential detecting circuit There is failure in electric protection circuit, and second protection chip, which should export not, allows charging signals to be sent to charger, but current In the market in the internal structure of mature second protection chip, ceiling voltage collection terminal accesses the power end of operating voltage with it Between all there is internal circuit connection, that is to say, that when open circuit conditions occurs in the resistance failure as maximum potential detection circuit When, the ceiling voltage collection terminal of second protection chip will have the voltage signal input from its power end, thus secondary guarantor Shield chip will judge by accident at this time, and output allows charging signals to be sent to charger, and there are security risks.
Summary of the invention
The technical problem to be solved by the utility model is to provide a kind of maximum potentials of lithium battery group charge protector Detection circuit, the maximum potential detection circuit not will lead to second protection chip and erroneous judgement situation occur, and lithium battery group can be improved Judgement reliability of the charge protector under single failure conditions.
Technical solution adopted by the utility model to solve the above technical problems is as follows: a kind of lithium battery group charge protector Maximum potential detection circuit, including m resistance, m is the integer more than or equal to 2, one end connection of the m resistance and its Connecting pin is the input terminal of the maximum potential detection circuit, and the other end of the m resistance connects and its connecting pin is The output end of the maximum potential detection circuit.
Compared with prior art, the utility model has the advantage of highest electricity is made up of at least two resistance in parallel Position detection circuit, even if single open circuit failure occurs in maximum potential detection circuit, (one of resistance interruption, other resistance are just Often), other resistance at this time in maximum potential detection circuit are still within normal operating conditions, the highest electricity of second protection chip Pressure collection terminal remains to the voltage signal at the maximum potential end by maximum potential detection circuit normal acquisition lithium battery group, secondary guarantor Shield chip not will receive its power end signal interference and judge by accident, it is possible thereby to improve lithium battery group charge protector in list Judgement reliability under secondary failure conditions.
Detailed description of the invention
Fig. 1 is the structure chart of existing lithium battery group charge protector;
Fig. 2 is the circuit diagram of the maximum potential detection circuit of existing lithium battery group charge protector;
Fig. 3 is the circuit diagram of the maximum potential detection circuit of the lithium battery group charge protector of the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
Embodiment: as shown in figure 3, a kind of maximum potential detection circuit of lithium battery group charge protector, including two Two resistance are referred to as first resistor R1 and second resistance R2 by resistance, one end of first resistor R1 and second resistance R2's One end connection and its connecting pin are the input terminal of maximum potential detection circuit, the other end of first resistor R1 and second resistance R2's Other end connection and its connecting pin are the output end of maximum potential detection circuit.
In the work of lithium battery group charge protector, the single open circuit failure conditions of the maximum potential detection circuit have two Kind: the first is first resistor R1 open circuit, and second resistance R2 is normal, and second is that first resistor R1 is normal, and second resistance R2 is disconnected Road.In the case of the first, although first resistor R1 open circuit, second resistance R2 can still work normally, the maximum potential The work of detection circuit is unaffected, and under same second situation, although second resistance R2 open circuit, first resistor R1 is still It can so work normally, the work of the maximum potential detection circuit is also unaffected, and the single of the maximum potential detection circuit is disconnected Road failure conditions not will cause the erroneous judgement of second protection protection chip in lithium battery group charge protector.

Claims (1)

1. a kind of maximum potential detection circuit of lithium battery group charge protector, it is characterised in that including m resistance, m is big It is connected in one end of the integer for being equal to 2, the m resistance and its connecting pin is the input of the maximum potential detection circuit The other end at end, the m resistance connects and its connecting pin is the output end of the maximum potential detection circuit.
CN201822056619.0U 2018-12-07 2018-12-07 A kind of maximum potential detection circuit of lithium battery group charge protector Active CN209560038U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201822056619.0U CN209560038U (en) 2018-12-07 2018-12-07 A kind of maximum potential detection circuit of lithium battery group charge protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201822056619.0U CN209560038U (en) 2018-12-07 2018-12-07 A kind of maximum potential detection circuit of lithium battery group charge protector

Publications (1)

Publication Number Publication Date
CN209560038U true CN209560038U (en) 2019-10-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201822056619.0U Active CN209560038U (en) 2018-12-07 2018-12-07 A kind of maximum potential detection circuit of lithium battery group charge protector

Country Status (1)

Country Link
CN (1) CN209560038U (en)

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