CN202159997U - Lithium battery system - Google Patents

Lithium battery system Download PDF

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Publication number
CN202159997U
CN202159997U CN2011202778654U CN201120277865U CN202159997U CN 202159997 U CN202159997 U CN 202159997U CN 2011202778654 U CN2011202778654 U CN 2011202778654U CN 201120277865 U CN201120277865 U CN 201120277865U CN 202159997 U CN202159997 U CN 202159997U
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CN
China
Prior art keywords
battery
lithium battery
detection circuit
circuit
lithium
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2011202778654U
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Chinese (zh)
Inventor
金鹰
李嘉穗
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WUXI XINWEI BATTERY CO Ltd
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WUXI XINWEI BATTERY CO Ltd
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Priority to CN2011202778654U priority Critical patent/CN202159997U/en
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Publication of CN202159997U publication Critical patent/CN202159997U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model relates to a lithium battery system which comprises a battery module consisting of at least one lithium battery; each lithium battery of the battery module is provided with a lithium battery protection device; each lithium battery protection device comprises a battery abnormality detection circuit for detecting the voltage and temperature of the lithium battery, and the battery abnormality detection circuits are connected with optical coupling circuits; when the operating temperature or voltage of the lithium battery detected by the battery abnormality detection circuit is matched with the preset value of the battery abnormality detection circuit, the battery abnormality detection circuit drives the optical coupling circuit to conduct, otherwise, the battery abnormality detection circuit allows the optical coupling circuit to be cut off in a high-impedance state; and the optical coupling circuits in the battery module are correspondingly connected. The lithium battery system has the advantages of compact structure and reduced use cost, and improves the service reliability of lithium batteries.

Description

A kind of lithium battery system
Technical field
The utility model relates to a kind of power supply protection system, and especially a kind of lithium battery system belongs to the technical field of lithium battery.
Background technology
Lead-acid battery is widely used in various field at present; But compare with lithium battery; Lead-acid battery is because cycle life is shorter; Energy density is lower, and lead still is a kind of heavy metal that very easily causes environmental pollution, the trend that the lithium battery that lead-acid battery is being faced with is not progressively had heavy metal pollution progressively substitutes.
Lithium battery is because its special electrochemical properties, if overtension during charging, battery has the danger that produces blast; When lithium battery discharges,, can have influence on the cycle life of lithium battery if when discharge voltage is lower than a fundamental voltage; In addition, the lithium battery operational environment must be controlled under certain temperature, in order to avoid battery structure is destroyed.Therefore when the practical application lithium battery, must increase power-supply management system (BMS), this system can monitor each series lithium battery voltage, and when detecting any a string lithium battery voltage or temperature anomaly, power-supply management system can cut off the charge or discharge electric current immediately.Lithium battery system comes the voltage of elevator system through the lithium battery quantity that increase is serially connected; Therefore different corresponding to the required lithium battery quantity that is serially connected of different operating voltages, also just need select for use different power-supply management system (BMS) to be complementary with it.
At present standard lead-acid battery system all is that battery module serial connection by 12V forms, its operating voltage be 12V N doubly, N is serial connection lead-acid battery module number.When substituting the lead-acid battery application with lithium battery; At first need be connected in series the lithium battery of some; The operating voltage of guaranteeing lithium battery system meets the requirements; And then select corresponding power-supply management system (BMS) coupling according to the quantity of serial connection lithium battery, guarantee that power-supply management system (BMS) has enough sense channels to detect each series lithium battery voltage.Use this lithium battery system to substitute traditional lead acid batteries and use, it is very loaded down with trivial details that its work becomes, and is unfavorable for applying of lithium battery.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that exists in the prior art, and a kind of lithium battery system is provided, and its compact conformation has improved the reliability that lithium battery uses, and reduces use cost.
According to the technical scheme that the utility model provides, said lithium battery system comprises the battery module that at least one lithium battery constitutes; Be equipped with lithium cell protecting device on the lithium battery in the said battery module; Said lithium cell protecting device comprises the battery abnormal detection circuit that is used to detect lithium battery voltage and temperature, and said battery abnormal detection circuit links to each other with optically coupled circuit; When the working temperature of battery abnormal detection circuit detection lithium battery or voltage and battery abnormal detection circuit preset value coupling, the battery abnormal detection circuit drives the optically coupled circuit conducting; When the battery abnormal detection circuit detected lithium battery temperature or voltage and battery abnormal detection circuit preset value and do not match, the battery abnormal detection circuit ended optically coupled circuit to be in high-impedance state; Optically coupled circuit in the battery module is corresponding to be connected.
Said battery protecting apparatus also comprises and is used for lithium battery is compressed into the balanced equalizing circuit of row.
Said optically coupled circuit comprises the light-emitting diode that links to each other with the battery abnormal detection circuit, and said light-emitting diode is corresponding with phototriode to link to each other.
Said battery module comprises that it is the battery pack of 12V that the lithium battery of four series connection forms output voltage, and the optically coupled circuit in the battery module is connected successively.
Said battery module is electrically connected with control circuit.
Said control circuit comprises the impedance detection circuit that links to each other with optically coupled circuit, and the output of said impedance detection circuit links to each other with the relay switch system, and said relay switch system also is electrically connected with the SOC checkout gear with overcurrent.
Said relay switch system comprises control relay circuit, and the output of said control relay circuit links to each other with relay switch; One end of relay switch is electrically connected with the SOC checkout gear with overcurrent, and overcurrent links to each other with control relay circuit with the output of SOC checkout gear.
Said overcurrent and SOC checkout gear comprise current detection circuit, and said current detection circuit links to each other with processor through the ADC module, and the output of said processor links to each other with the SOC display; The output of current detection circuit also links to each other with over-current detection circuit, and the output of over-current detection circuit links to each other with the relay switch system.
Said processor is single-chip microcomputer, ARM, DSP or FPGA.Said lithium battery is that voltage is the ferric phosphate lithium cell of 3.2V.
The advantage of the utility model: a plurality of lithium battery series connection form battery module; On the lithium battery in the battery module li-ion cell protection module is set all, the li-ion cell protection module comprises equalizing circuit and battery abnormal detection circuit, and the battery abnormal detection circuit links to each other with optically coupled circuit, the phototriode series connection in the optically coupled circuit; When voltage or temperature and the set point that detects lithium battery when the battery abnormal detection circuit do not match, phototriode is in by high-impedance state, can points out the operating state in the battery module, for the safe work state of battery module provides the signal indication; Battery module links to each other with external circuits through control circuit, through the operating state of control circuit ability regulating cell module and external circuits; Compact conformation has improved the reliability that lithium battery uses, and reduces use cost.
Description of drawings
Fig. 1 is the structured flowchart that the utility model lithium battery links to each other with lithium cell protecting device.
Fig. 2 is the structured flowchart of the utility model.
Fig. 3 is the user mode block diagram of the utility model.
Fig. 4 is the structured flowchart of the utility model control circuit.
Fig. 5 is the another kind of user mode figure of the utility model.
Embodiment
Below in conjunction with concrete accompanying drawing and embodiment the utility model is described further.
Like Fig. 1~shown in Figure 5: the utility model comprises lithium battery 1; Lithium cell protecting device 2; Equalizing circuit 3; Battery abnormal detection circuit 4; Optically coupled circuit 5; Light-emitting diode 6; Phototriode 7; Battery module 8; Control circuit 9; Impedance detection circuit 10; Relay switch system 11; Control relay circuit 12; Relay switch 13; Overcurrent and SOC checkout gear 14; Current sensing means 15; Over-current detection circuit 16; ADC module 17; Processor 18; SOC display 19 and external circuits 20.
As depicted in figs. 1 and 2: in order to improve the reliability that lithium battery 1 uses, said lithium battery 1 is provided with lithium cell protecting device 2, and said lithium cell protecting device 2 comprises equalizing circuit 3 and battery abnormal detection circuit 4; When lithium battery 1 when overcharging, equalizing circuit 3 output equalizing signals can make lithium battery 1 discharge, and produce damage to avoid lithium battery 1 to overcharge.Lithium cell protecting device 2 also comprises battery abnormal detection circuit 4; Said battery abnormal detection circuit 4 can detect the voltage and the temperature value of lithium battery 1; When predefined numerical value does not match in said voltage and temperature value and the battery abnormal detection circuit 4, battery abnormal detection circuit 4 meeting output abnormality signals; Particularly; Battery abnormal detection circuit 4 links to each other with optically coupled circuit 5, and said optically coupled circuit 5 comprises light-emitting diode 6 and phototriode 7, and said photodiode 6 links to each other with battery abnormal detection circuit 4; When temperature and voltage and the set point that detects lithium batteries 1 when battery abnormal detection circuit 4 is complementary; Battery abnormal detection circuit 4 makes light-emitting diode 6 luminous, and the irradiate light that light-emitting diode 6 sends makes phototriode 7 conductings on phototriode 7; Simultaneously; When temperature and voltage and the set point that detects lithium batteries 1 when battery abnormal detection circuit 4 do not match; It is luminous that battery abnormal detection circuit 4 can make light-emitting diode 6 stop, and after light-emitting diode 6 stopped outside luminous irradiation phototriode 7, phototriode 7 was in by high-impedance state.
In order to improve lithium battery 1 outside output voltage values, need a plurality of lithium batteries 1 be connected.Particularly, the ferric phosphate lithium cell series connection that the utility model battery module 8 is 3.2V by four average voltages constitutes, and the voltage of battery module 8 is 12V, can be corresponding with various lead-acid batteries.After four lithium battery 1 series connection, the emitter of phototriode 7 links to each other with collector electrode successively, and four phototriodes 7 are serially connected.Among Fig. 2, A end is 12V with voltage between the B end, and the C end equals connecting of phototriode 7 impedances with resistance value between D holds.Therefore, when the voltage that a lithium battery 1 is arranged in the battery module 8 or temperature and set point do not match, can be in high-impedance state with this lithium battery 1 corresponding phototriode 7, the impedance between the C end is held with D also can become very high.
Like Fig. 3 with shown in Figure 4: the user mode figure that links to each other with external circuits 20 for battery module 8; Particularly, battery module 8 links to each other with external circuits 20 through control circuit 9; External circuits 20 can be external load, also can be charger.Control circuit 9 can be according to the status adjustment battery module 8 of battery module 8 and the connection status of external circuits 20.Particularly, control circuit 9 comprises impedance detection circuit 10, and the output of said impedance detection circuit 10 links to each other with relay switch system 11, and said relay switch system 11 links to each other with SOC (state of charge) checkout gear 14 with overcurrent.Overcurrent and SOC checkout gear 14 comprise current detection circuit 15; Said current detection circuit 15 links to each other with relay switch system 11 through over-current detection circuit 16; And current detection circuit 15 links to each other with processor (MCU) 18 through ADC (analog-to-digital conversion) module 17; The output of said processor 18 links to each other with SOC display 19, and said processor 18 can be single-chip microcomputer, ARM (Advanced RISC Machines), DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array) or other microprocessors.Relay switch system 11 comprises control relay circuit 12, and said relay switching circuit 12 links to each other with current detection circuit 15 through relay switch 13, and the other end of relay switch 13 links to each other with external circuits 20.During work, the A of the battery module 8 end back that links to each other with the C end links to each other with external circuits 20, and the B end of battery module 8 and D end link to each other with the E end and the G end of control circuit 9, and the F end of control circuit 9 links to each other with external circuits 20, the control of formation battery module 8 and the loop of working.When external circuits 20 was load circuit, battery module 8 was through control circuit 9 outside output voltages, and when external circuits 20 was charger, external circuits 20 charged through the lithium battery 1 in 9 pairs of battery modules of control circuit 8.When the set point of temperature or voltage and battery abnormal detection circuit 4 did not match when the lithium battery 1 in the battery module 8 was worked, corresponding phototriode 7 can be in by high-impedance state, and then the resistance value between whole C end and D end becomes very high.Resistance value between C end and D end detects through impedance detection circuit 10; When impedance detection circuit 10 detects high impedance value; Impedance detection circuit 10 can be exported signal to relay switch system 11; So that the relay switch 13 in the relay switch system 11 breaks off, be connected with the circuit of 8 of battery modules thereby break off external circuits 20.When impedance detection circuit 10 detects C end and matees with set point with resistance value between the D end, can not influence the connection status of battery module 8 and external circuits 20.When the work that detects external circuits 20 when overcurrent detection module 16 is in overcurrent; External circuits 20 is through the closure state of control relay circuit 12 relay switch 13; When relay switch 13 breaks off; External circuits 20 broke off with being connected also of 8 of battery modules, thereby can guarantee the safety and the reliability of battery module 8 or external circuits 20.Current detection circuit 15 in overcurrent and the SOC checkout gear 14 is measured and is flow through size of current; And convert current signal into a voltage signal and export ADC module 17 to; ADC module 17 is to export processor 18 to after the digital signal with this analog signal conversion; Processor 18 can carry out dynamic estimation through the method for integration to SOC according to the data that collect, and the SOC value that estimates is shown through SOC display 19.
As shown in Figure 5: as to be that three battery modules, 8 series connection backs link to each other with external circuits 20 through control circuit 9, thereby to form 36V lithium battery work loop.Particularly, the phototriode 7 series connection backs in the battery module 8 link to each other with impedance detection circuit 10, and lithium battery 1 series connection in the battery module 8 forms the 36V operating voltage.
Like Fig. 1~Fig. 5: during use, can be according to lithium battery 1 series connection of the needs of relevant work voltage with respective numbers; Li-ion cell protection module 2 is set on the lithium battery 1.After lithium battery 1 series connection, the emitter of the phototriode 7 in the li-ion cell protection module 2 is connected with collector electrode successively.The battery pack that lithium battery 1 series connection back forms links to each other with external circuits 20 through control circuit 9.During work, according to the difference of external circuits 20, lithium battery 1 is in the charge or discharge state.During charging, when lithium battery 1 overcharged, equalizing circuit 3 can make lithium battery 1 discharge.Simultaneously.During discharge, when when the voltage of lithium battery 1 or the set point in temperature and the battery abnormality detection module 4 do not match, corresponding phototriode 7 also can be in by high-impedance state, and the impedance of whole battery group just is in high-impedance state.After impedance detection circuit 10 detects corresponding high-impedance state, break off being connected of battery pack and external circuits 20, thereby can guarantee the reliability of whole connecting circuit through relay switch 13.Over-current detection circuits 16 in the control circuit 9 also can detect the overcurrent operating state of battery pack, when the battery pack overcurrent, also can break off being connected of battery pack and external circuits 20 through relay switch 13, and whole work loop is safe and reliable.
A plurality of lithium battery 1 series connection of the utility model form battery module 8; On the lithium battery 1 in the battery module 8 li-ion cell protection module 2 is set all, li-ion cell protection module 2 comprises equalizing circuit 3 and battery abnormal detection circuit 4, and battery abnormal detection circuit 4 links to each other with optically coupled circuit 5, phototriode 7 series connection in the optically coupled circuit 5; When voltage or temperature and the set point that detects lithium battery 1 when battery abnormal detection circuit 4 do not match; Phototriode 7 is in by high-impedance state; Can point out the operating state in the battery module 8, for the safe work state of battery module 8 provides the signal indication; Battery module 8 links to each other with external circuits 20 through control circuit 9, through the operating state of control circuit 9 ability regulating cell modules 8 with external circuits 20; Compact conformation has improved the reliability that lithium battery uses, and reduces use cost.

Claims (10)

1. a lithium battery system comprises the battery module (8) that at least one lithium battery (1) constitutes; It is characterized in that: be equipped with lithium cell protecting device (2) on the lithium battery (1) in the said battery module (8); Said lithium cell protecting device (2) comprises the battery abnormal detection circuit (4) that is used to detect lithium battery (1) voltage and temperature, and said battery abnormal detection circuit (4) links to each other with optically coupled circuit (5); When the working temperature of battery abnormal detection circuit (4) detection lithium battery (1) or voltage and battery abnormal detection circuit (4) preset value coupling, battery abnormal detection circuit (4) drives optically coupled circuit (5) conducting; Battery abnormal detection circuit (4) detects lithium battery (1) temperature or voltage and battery abnormal detection circuit (4) when preset value does not match, and battery abnormal detection circuit (4) makes optically coupled circuit (5) by being in high-impedance state; Optically coupled circuit (5) in the battery module (8) is corresponding to be connected.
2. lithium battery system according to claim 1 is characterized in that: said battery protecting apparatus (2) also comprises and is used for lithium battery (1) voltage is carried out balanced equalizing circuit (3).
3. lithium battery system according to claim 1 is characterized in that: said optically coupled circuit (5) comprises the light-emitting diode (6) that links to each other with battery abnormal detection circuit (4), and said light-emitting diode (6) is corresponding with phototriode (7) to link to each other.
4. lithium battery system according to claim 1 is characterized in that: said battery module (8) comprises that it is the battery pack of 12V that the lithium battery (1) of four series connection forms output voltage, and the optically coupled circuit (5) in the battery module (8) is connected successively.
5. lithium battery system according to claim 1 is characterized in that: said battery module (8) is electrically connected with control circuit (9).
6. lithium battery system according to claim 5; It is characterized in that: said control circuit (9) comprises the impedance detection circuit (10) that links to each other with optically coupled circuit (5); The output of said impedance detection circuit (10) links to each other with relay switch system (11), and said relay switch system (11) also is electrically connected with SOC checkout gear (14) with overcurrent.
7. lithium battery system according to claim 6 is characterized in that: said relay switch system (11) comprises control relay circuit (12), and the output of said control relay circuit (12) links to each other with relay switch (13); One end of relay switch (13) is electrically connected with SOC checkout gear (14) with overcurrent, and overcurrent links to each other with control relay circuit (12) with the output of SOC checkout gear (14).
8. lithium battery system according to claim 6; It is characterized in that: said overcurrent and SOC checkout gear (14) comprise current detection circuit (15); Said current detection circuit (15) links to each other with processor (18) through ADC module (17), and the output of said processor (18) links to each other with SOC display (19); The output of current detection circuit (15) also links to each other with over-current detection circuit (16), and the output of over-current detection circuit (16) links to each other with relay switch system (11).
9. lithium battery system according to claim 8 is characterized in that: said processor (18) is single-chip microcomputer, ARM, DSP or FPGA.
10. lithium battery system according to claim 1 is characterized in that: said lithium battery (1) is the ferric phosphate lithium cell of 3.2V for voltage.
CN2011202778654U 2011-08-02 2011-08-02 Lithium battery system Expired - Fee Related CN202159997U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011202778654U CN202159997U (en) 2011-08-02 2011-08-02 Lithium battery system

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Application Number Priority Date Filing Date Title
CN2011202778654U CN202159997U (en) 2011-08-02 2011-08-02 Lithium battery system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104319740A (en) * 2014-10-14 2015-01-28 江苏嘉钰新能源技术有限公司 Monitoring and protecting device for electric field coupling wireless charging system and method thereof
CN107964997A (en) * 2013-02-08 2018-04-27 住友建机株式会社 The control method of excavator and excavator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107964997A (en) * 2013-02-08 2018-04-27 住友建机株式会社 The control method of excavator and excavator
CN104319740A (en) * 2014-10-14 2015-01-28 江苏嘉钰新能源技术有限公司 Monitoring and protecting device for electric field coupling wireless charging system and method thereof

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GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120307

Termination date: 20140802