CN103837831A - Battery effectiveness analyzing model - Google Patents

Battery effectiveness analyzing model Download PDF

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Publication number
CN103837831A
CN103837831A CN201210505481.2A CN201210505481A CN103837831A CN 103837831 A CN103837831 A CN 103837831A CN 201210505481 A CN201210505481 A CN 201210505481A CN 103837831 A CN103837831 A CN 103837831A
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CN
China
Prior art keywords
lithium ion
voltage
ion battery
battery
cpu
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Application number
CN201210505481.2A
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Chinese (zh)
Inventor
仝利锋
李亚军
张昉
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凯迈(洛阳)电子有限公司
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Priority to CN201210505481.2A priority Critical patent/CN103837831A/en
Publication of CN103837831A publication Critical patent/CN103837831A/en

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Abstract

A lithium ion battery effectiveness analyzing model comprises a voltage monitoring and controlling unit. The voltage monitoring and controlling unit is mainly composed of an MOSFET tube Q and an acquisition resistor R. A current monitoring and controlling unit is mainly composed of a shunt T and an operational amplifier N. The MOSFET tube Q controls connection or disconnection of a voltage measurement node and achieves switching of the node to be acquired, the shunt T achieves the effect of converting a current signal in a return circuit of a lithium ion battery into a voltage signal, and a corresponding voltage signal output and amplified by the operational amplifier is used for being acquired by a single-chip microcomputer. In the battery effectiveness analyzing model, the single-chip microcomputer used for controlling the MOSFET tube Q to be switched on or switched off and switching the battery measurement node is arranged. According to the lithium ion battery effectiveness analyzing model, by means of the effectiveness analysis on the lithium ion battery, a lithium ion battery with large individual difference is screened in time, application efficiency of the whole set of battery is improved, and the problems of a short service life of the whole set of battery and even damage to the battery caused by the individual difference of the lithium ion battery in the use process of the lithium ion battery are solved.

Description

A kind of battery Validity Analysis Model

Technical field

The present invention relates to a kind of lithium ion battery management system, particularly relate to a kind of battery Validity Analysis Model.

Background technology

The application of lithium ion battery in new forms of energy product is more and more, and its management system, as control core, is a considerable link in lithium ion battery applications system.Lithium ion battery now exist individual difference large, discharge and recharge low self-defect of life-span, thereby can be because the otherness that discharges and recharges of single battery causes the whole Battery pack life-span all to reduce even damage in the time of a Battery pack serial or parallel connection application, in order better rationally to utilize lithium ion battery, will be to its application process Real-Time Monitoring, and then it is carried out to charge-discharge performance efficiency analysis, excessive or too low individual lithium ion battery load voltage value, the excessive too high lithium ion battery of own loss that causes of internal resistance are screened to replacing.Thereby realize the performance monitoring in lithium ion battery applications process by lithium ion battery Validity Analysis Model.

Because the defect that above-mentioned existing touch-control system electric power controller exists, practical experience and the professional knowledge of the inventor based on being engaged in this type of product design manufacture and enriching for many years, actively research and innovation in addition, makes it have more practicality to founding a kind of battery Validity Analysis Model.

summary of the invention

The object of the invention is to, overcome existing ion battery and have the defect that individual difference is large, discharge and recharge low self-defect existence of life-span, and provide a kind of battery Validity Analysis Model of new structure, technical matters to be solved is to make its voltage monitoring control, current monitoring control of passing through lithium ion battery applications process ensure that it in use can not damage, make lithium ion battery applications more reasonable, extended serviceable life.

The object of the invention to solve the technical problems realizes by the following technical solutions.The effective analytical model of a kind of battery proposing according to the present invention, it comprises: voltage monitoring control module, current monitoring control module two parts; Single-chip microcomputer gathers control by universal I/O port to voltage monitoring control and current monitoring control, and after gathering, the voltage of lithium ion battery, current signal access on Chip Microcomputer A/D mouth and gather after A/D conversion.

The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.

The effective analytical model of aforesaid battery, wherein said voltage monitoring control module is mainly made up of photoelectricity MOSFET pipe Q, collection resistance R; U1, U2 are that lithium ion battery voltage is measured node, are connected to the both positive and negative polarity of lithium ion battery; CPU_K1, CPU_K2, CPU_KAH, CPU_KBL connect controller general IO mouth as control, in the time that we need to monitor between U1, U2 voltage, Single-chip Controlling CPU_K1, CPU_K2 output high level control photoelectricity MOSFET pipe Q1, Q2 conducting, make U1 connect A node, and U2 connects B node.

The effective analytical model of aforementioned battery, wherein said U1 connects the positive pole of lithium ion battery, U2 connects lithium ion battery negative, so the voltage-to-ground of U1 is greater than U2 voltage-to-ground, the voltage acquisition value that the collection magnitude of voltage of A node deducts B node is the relative voltage between U1, U2, be that high-order AD voltage acquisition mouth CPU_ADH goes up by A node access single-chip microcomputer default setting, otherwise on the AD voltage acquisition mouth CPU_ADL that is low level by B node access single-chip microcomputer default setting.

The effective analytical model of aforementioned battery, wherein said current monitoring control module is mainly shunt T1, operational amplifier N1 composition; Wherein symbol represent the device systems that lithium ion battery is supplied, by it, lithium ion battery is formed to current return, shunt T1 is connected in current return, output voltage is V1, and V1 carries out voltage acquisition by voltage amplification to accessing Chip Microcomputer A/D mouth after within the scope of the safe collection value of Chip Microcomputer A/D mouth through operational amplifier N1.

The effective analytical model of aforementioned battery, wherein said operational amplifier voltage amplification factor computing method are V1out=(1+Rf/Ri) * V1.

The effective analytical model of aforementioned battery, wherein said lithium ion battery is that multiple lithium ion batteries are composed in series lithium ion battery group.

The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, the voltage of the present invention by lithium ion battery use procedure, current monitoring control and to its efficiency analysis, filtering out in time the lithium ion battery that wherein individual difference is larger changes, significantly improve whole Battery pack application efficiency, solved and caused reducing in whole Battery pack serviceable life the result that damage is set because of lithium ion battery individual difference in lithium ion battery use procedure.Thereby extend the serviceable life of lithium ion battery, there is feature reasonable in design, cost is low.

Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.

Brief description of the drawings

Fig. 1 is voltage monitoring control module principle of work schematic diagram of the present invention;

Fig. 2 is current monitoring control module principle of work schematic diagram of the present invention;

Fig. 3 is the Validity Analysis Model principle of work schematic diagram of multiple lithium ion battery groups;

Fig. 4 is the system chart of lithium ion battery Validity Analysis Model;

In figure: Q1, Q2, Qn, Qah, Qal, Qbh, Qbl: photoelectricity MOSFET pipe

Rx: common current-limiting resistance or pull down resistor;

R1, R2, Rn, Rah, Ral, Rbh, Rbl: gather resistance

Ri, Rf: operational amplifier amplifying parameters resistance

T1, T2, Tn: shunt

N1, Nn: operational amplifier

CPU_K1, CPU_K2, CPU_Kn, CPU_KAH, CPU_KBH, CPU_KAL, CPU_KBL: controller general IO controls delivery outlet

CPU_ADH, CPU_ADL: Chip Microcomputer A/D Gather and input mouth

U1, U2, U3, Un, Un+1: required collection lithium ion battery is measured node

B: control required collection any two measured voltage node

V1, V2, Vn: the current signal of lithium ion battery in loop isolated voltage signal after shunt T1, T2, Tn;

V1out, Vnout:V1, the output voltage of Vn after operational amplifier N1, Nn amplify;

VCC: the supply voltage of operational amplifier N1, Nn.

Embodiment

Technological means and effect of taking for reaching predetermined goal of the invention for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to a kind of battery Validity Analysis Model proposing according to the present invention, its embodiment, structure, feature and effect thereof, be described in detail as follows.

Refer to shown in Fig. 4, the effective analytical model of a kind of battery, it comprises: effectively analytical model comprises voltage monitoring control module, current monitoring control module two parts; Single-chip microcomputer gathers control by universal I/O port to voltage monitoring control and current monitoring control.After gathering, lithium ion battery voltage, current signal access on Chip Microcomputer A/D mouth and gather after A/D conversion.

Refer to shown in Fig. 1, for voltage monitoring control module is mainly made up of photoelectricity MOSFET pipe Q, collection resistance R; Described voltage monitoring control module is mainly by photoelectricity MOSFET pipe Q1, Q2, Qah, Qbl, sampling resistor R1, R2, Rah, Rbl composition; Wherein U1, U2 are that lithium ion battery voltage is measured node, are connected to the both positive and negative polarity of lithium ion battery; CPU_K1, CPU_K2, CPU_KAH, CPU_KBL connect controller general IO mouth as control.In the time that we need to monitor between U1, U2 voltage, Single-chip Controlling CPU_K1, CPU_K2 output high level control photoelectricity MOSFET pipe Q1, Q2 conducting, make U1 connect A node, and U2 connects B node.The anodal U2 that connects lithium ion battery due to U1 connects lithium ion battery negative, so the voltage-to-ground of U1 is greater than U2 voltage-to-ground, the voltage acquisition value that the collection magnitude of voltage of A node deducts B node is the relative voltage between U1, U2, therefore need be on high-order AD voltage acquisition mouth CPU_ADH by A node access single-chip microcomputer default setting, otherwise the AD voltage acquisition mouth CPU_ADL that is low level by B node access single-chip microcomputer default setting is upper, be used for preventing that calculating voltage from being the situation generation of negative value.Therefore still need two groups of photoelectricity MOSFET pipes Qah, Qbl, sampling resistor Rah, Rbl.Qah conducting in the time of Single-chip Controlling CPU_KAH output high level, A node access single-chip microcomputer default setting is on high AD voltage acquisition mouth CPU_ADH, Qbl conducting in the time of Single-chip Controlling CPU_KBL output high level, B node access single-chip microcomputer default setting is on low AD voltage acquisition mouth CPU_ADL.In figure, Rx is common current-limiting resistance.So far complete the voltage monitoring control to a lithium ion battery.

Referring to shown in Fig. 2, is current monitoring control module principle of work schematic diagram of the present invention, and described current monitoring control is mainly shunt T1, operational amplifier N1 composition; The device systems that wherein symbology lithium ion battery is supplied, forms current return by it by lithium ion battery, and shunt T1 is connected in current return, and output voltage is V1.V1 carries out voltage acquisition by voltage amplification to accessing Chip Microcomputer A/D mouth after within the scope of the safe collection value of Chip Microcomputer A/D mouth through operational amplifier N1.Wherein operational amplifier voltage amplification factor computing method are V1out=(1+Rf/Ri) * V1.In figure, Rx is common pull down resistor.So far complete the current monitoring control to a lithium ion battery.

As shown in Figure 2, for current monitoring control module is mainly made up of shunt T1, operational amplifier N1; Described photoelectricity MOSFET pipe Q is arranged in voltage monitoring control module, plays the effect that is switched on or switched off circuit, thereby realizes the switching to required collection node; Described shunt T1 is arranged in current monitoring control module, play the effect that the current signal on single lithium ion battery loop is changed into voltage signal, corresponding operational amplifier N1 is provided with reference voltage V CC, and Vnout is for the timely collection analysis of single-chip microcomputer in output; Described voltage monitoring control module, current monitoring control module are by Single-chip Controlling.

Refer to shown in Fig. 3, it is the Validity Analysis Model principle of work schematic diagram of multiple lithium ion battery groups, it is composed in series lithium ion battery group by multiple lithium ion batteries, and its voltage, current monitoring control principle of work and single lithium ion battery voltage, current monitoring control principle of work are identical.Just formed by N single lithium ion battery voltage, current monitoring control module.It should be noted that: in the time of second lithium ion battery voltage of monitoring, it is the difference of U2 node voltage-to-ground and U3 node voltage-to-ground, Single-chip Controlling CPU_K2, CPU_K3 output high level control photoelectricity MOSFET pipe Q2, Q3 conducting, make U2 connect B node, and U3 connects A node.The anodal U3 that connects lithium ion battery due to U2 connects lithium ion battery negative, so Single-chip Controlling CPU_KBH output high level Qbh conducting, B node access single-chip microcomputer default setting is on high AD voltage acquisition mouth CPU_ADH, same Single-chip Controlling CPU_KAL output high level Qal conducting, A node access single-chip microcomputer default setting is on low AD voltage acquisition mouth CPU_ADL.By that analogy, single-chip microcomputer completes the voltage monitoring control to lithium ion battery group.In figure, Rx is common current-limiting resistance or pull down resistor.

In the time that lithium ion battery normally uses, by Single-chip Controlling photoelectricity MOSFET pipe Q conducting, carry out voltage acquisition through gathering resistance R by accessing Chip Microcomputer A/D mouth after voltage stabilization is within the scope of the safe collection value of Chip Microcomputer A/D mouth, complete the voltage monitoring control to lithium ion battery.Current monitoring control is series connection access shunt T in cell circuit, and current signal is converted to after voltage signal through operational amplifier voltage amplification is gathered to accessing Chip Microcomputer A/D mouth within the scope of the safe collection value of Chip Microcomputer A/D mouth.

Be that multiple serial or parallel connections become lithium ion battery group when application at described lithium ion battery, corresponding lithium ion battery group arranges respectively voltage monitoring control device and current monitoring control device; Described lithium ion battery group is multiple lithium ion battery serial or parallel connection compositions; Described voltage monitoring control device is to be made up of multiple voltage monitoring control modules; Described current monitoring control device is to be made up of multiple current monitoring control modules; Corresponding each lithium ion battery voltage Monitoring and Controlling unit is provided with photoelectricity MOSFET pipe Q and sampling resistor R; Corresponding each lithium ion battery electric current Monitoring and Controlling unit is provided with shunt T and operational amplifier N.

A kind of lithium ion battery Validity Analysis Model that the present invention proposes, analyze in time the application performance parameter of each battery by the voltage monitoring control to lithium ion battery, current monitoring control, thereby further detect lithium ion battery that one group of individual difference in lithium ion battery is large in time by its replacing.Make lithium ion battery applications more reasonable, extended serviceable life.The battery Validity Analysis Model that the present invention proposes has feature reasonable in design, cost is low.

The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (6)

1. the effective analytical model of battery, is characterized in that comprising: voltage monitoring control module, current monitoring control module two parts; Single-chip microcomputer gathers control by universal I/O port to voltage monitoring control and current monitoring control, and after gathering, the voltage of lithium ion battery, current signal access on Chip Microcomputer A/D mouth and gather after A/D conversion.
2. the effective analytical model of battery according to claim 1, it is characterized in that described voltage monitoring control module mainly by photoelectricity MOSFET pipe Q, gather resistance R and form; U1, U2 are that lithium ion battery voltage is measured node, are connected to the both positive and negative polarity of lithium ion battery; CPU_K1, CPU_K2, CPU_KAH, CPU_KBL connect controller general IO mouth as control, in the time that we need to monitor between U1, U2 voltage, Single-chip Controlling CPU_K1, CPU_K2 output high level control photoelectricity MOSFET pipe Q1, Q2 conducting, make U1 connect A node, and U2 connects B node.
3. the effective analytical model of battery according to claim 2, it is characterized in that described U1 connects the positive pole of lithium ion battery, U2 connects lithium ion battery negative, so the voltage-to-ground of U1 is greater than U2 voltage-to-ground, the voltage acquisition value that the collection magnitude of voltage of A node deducts B node is the relative voltage between U1, U2, be that high-order AD voltage acquisition mouth CPU_ADH goes up by A node access single-chip microcomputer default setting, otherwise on the AD voltage acquisition mouth CPU_ADL that is low level by B node access single-chip microcomputer default setting.
4. the effective analytical model of battery according to claim 1, is characterized in that described current monitoring control module is mainly shunt T1, operational amplifier N1 composition; Wherein symbol represent the device systems that lithium ion battery is supplied, by it, lithium ion battery is formed to current return, shunt T1 is connected in current return, output voltage is V1, and V1 carries out voltage acquisition by voltage amplification to accessing Chip Microcomputer A/D mouth after within the scope of the safe collection value of Chip Microcomputer A/D mouth through operational amplifier N1.
5. the effective analytical model of battery according to claim 4, is characterized in that described operational amplifier voltage amplification factor computing method are V1out=(1+Rf/Ri) * V1.
6. the effective analytical model of battery according to claim 1, is characterized in that described lithium ion battery is that multiple lithium ion batteries are composed in series lithium ion battery group.
CN201210505481.2A 2012-11-30 2012-11-30 Battery effectiveness analyzing model CN103837831A (en)

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Application publication date: 20140604