CN203967214U - A kind of online lithium battery Battery pack terminal voltage checkout gear - Google Patents
A kind of online lithium battery Battery pack terminal voltage checkout gear Download PDFInfo
- Publication number
- CN203967214U CN203967214U CN201420382013.5U CN201420382013U CN203967214U CN 203967214 U CN203967214 U CN 203967214U CN 201420382013 U CN201420382013 U CN 201420382013U CN 203967214 U CN203967214 U CN 203967214U
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- China
- Prior art keywords
- lithium battery
- analog switch
- battery
- terminal voltage
- subtracter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a kind of online lithium battery Battery pack terminal voltage checkout gear, device comprises the lithium battery group being composed in series by some single lithium battery, select analog switch, subtracter, A/D change-over circuit and main control chip MCU, the link that each single lithium battery in lithium battery group is drawn is connected with selecting the input of analog switch, selects the output of analog switch to be connected with subtracter, A/D change-over circuit and main control chip MCU in turn.Its detection method is that the link that each single lithium battery is drawn is connected with selecting the input of analog switch, and output signal is processed through subtracter, A/D change-over circuit and main control chip MCU successively.The utility model reasonable in design, has little, the easy to detect advantage accurately of testing cost, can be accurately to the accurately online detection of the terminal voltage of each cell of higher, a fairly large number of lithium battery group of voltage.
Description
Technical field
The utility model relates to field of power electronics, relates in particular to a kind of battery set management control field of electric automobile and electrical network energy storage.
Background technology
At present, lithium ion battery is widely used in industrial production and every field, the especially electric automobile of people's life and a kind of lithium battery group management control technique of electrical network energy storage.In order to obtain high power, high voltage, battery series-parallel connection must be used, but the parameter of each battery cell is inconsistent, caused the inconsistent of battery charging and discharging performance.For the capacity that each cell is discharged and recharged reaches unanimity, extend battery pack useful life, need to manage each cell, and the core of management is how monomer battery voltage to be detected online, because the battery of electric automobile or electrical network energy storage series connection is a lot, voltage is higher, detects monomer battery voltage difficulty larger.
Utility model content
Utility model object: the purpose of this utility model is in order to solve deficiency of the prior art, a kind of online lithium battery Battery pack terminal voltage checkout gear is provided, can be accurately to the accurately online detection of the terminal voltage of each cell of higher, a fairly large number of lithium battery group of voltage.
Technical scheme: a kind of online lithium battery Battery pack terminal voltage checkout gear described in the utility model, comprise the lithium battery group being composed in series by some single lithium battery, select analog switch, subtracter, A/D change-over circuit and main control chip MCU, the link that each single lithium battery in described lithium battery group is drawn is connected with the input of described selection analog switch, the output of described selection analog switch is connected with the input of described subtracter, the output of described subtracter is connected with the input of A/D change-over circuit, the output of described A/D change-over circuit is connected with main control chip MCU.
As preferably, described selection analog switch is four to select an analog switch.
As preferably, the link that the every two joint single lithium battery in described lithium battery group are drawn is connected with wherein two inputs of described selection analog switch.
As preferably, the input signal of described subtracter is respectively the voltage signal of adjacent two single lithium battery.
As preferably, the power supply of described selection analog switch is connected with the negative terminal of described lithium battery.
A kind of online lithium battery Battery pack terminal voltage detection method of utilizing above-mentioned detection device to propose, comprises the steps:
1) link of each single lithium battery being drawn is connected with the input of described selection analog switch;
2) by control, select analog switch Enable Pin, the terminal voltage detection signal of adjacent two batteries of gating is given subtracter;
3) by subtracter, difference is sent into A/D change-over circuit;
4) after A/D conversion, obtain reflecting that the digital signal of battery terminal voltage gives main control chip MCU, main control chip MCU, according to the A/D conversion value reading, completes battery set management relevant action.
Beneficial effect: the utility model reasonable in design, there is little, the easy to detect advantage accurately of testing cost, can be accurately to the accurately online detection of the terminal voltage of each cell of higher, a fairly large number of lithium battery group of voltage.
Accompanying drawing explanation
Fig. 1 is the utility model monomer battery voltage signals collecting schematic diagram.
Fig. 2 is that the utility model detects principle schematic online.
Embodiment
Fig. 1 is the utility model monomer battery voltage signals collecting schematic diagram.The lithium battery group being composed in series by cell, is that each cell positive pole is connected with another cell negative pole, and after series connection, each monomer battery voltage is more and more higher, even can reach several hectovolts.By the junction extraction voltage detection signal of its anode and battery cathode, detect each cell negative pole and anodal two place's voltage detection signals poor, can know this cell on-Line Voltage value.In like manner can detect the online monomer voltage value of battery pack that any joint cell is composed in series.
Fig. 2 is that the utility model detects principle schematic online.An online lithium battery Battery pack terminal voltage checkout gear, comprises the lithium battery group that some single lithium battery are composed in series, and two-way four selects an analog switch 1(Nn, Nn+1), subtracter 2, A/D change-over circuit 3 and main control chip MCU 4.The link and four that each single lithium battery in lithium battery group is drawn selects the input of an analog switch 1 to be connected, four select the output of an analog switch 1 to be connected with the input of subtracter 2, the output of subtracter 2 is connected with the input of A/D change-over circuit 3, and the output of A/D change-over circuit 3 is connected with main control chip MCU 4.
Its detection method is extraction voltage detection signal between every two joint cells of connecting from lithium battery group to be delivered to four select an analog switch input.Corresponding two four of each detection signal selects an input, by controlling four, selects an analog switch Enable Pin, and the different detection signals of gating are sent difference into A/D change-over circuit by subtracter.Main control chip MCU, according to the A/D conversion value reading, completes monomer battery voltage and detects.
Wherein, four select an analog switch Enable Pin control truth table as shown in the table:
If control S0=0, S1=0, for two-way four, select an analog switch Nn, OUTA output A0 signal, be gating Cn signal, OUTB output B0 signal, i.e. gating Cn+1 signal, OUTA and OUTB signal are sent into subtracter, and now subtracter output analog voltage signal value is the battery on-Line Voltage between Cn and Cn+1 sampled point.Now for two-way four, select an analog switch Nn+1, OUTC output A0 signal, it is gating Cn+4 signal, OUTD output B0 signal, it is gating Cn+5 signal, OUTC and OUTD signal are sent into subtracter, and now subtracter output analog voltage signal value is the on-Line Voltage of the battery between Cn+4 and Cn+5 sampled point.
If in like manner control S0=0, S1=1, can obtain respectively the on-Line Voltage of the battery between Cn+1 and Cn+2 sampled point, the on-Line Voltage of the battery between Cn+5 and Cn+6 sampled point.
If in like manner control S0=1, S1=0, can obtain respectively the on-Line Voltage of the battery between Cn+2 and Cn+3 sampled point, the on-Line Voltage of the battery between Cn+6 and Cn+7 sampled point.
If in like manner control S0=1, S1=1, can obtain respectively the on-Line Voltage of the battery between Cn+3 and Cn+4 sampled point, the on-Line Voltage of the battery between Cn+7 and Cn+8 sampled point.
It is example that the two-way four of take in Fig. 2 selects an analog switch Nn, positive source is connected to Cn+4, power cathode is connected to Cn by diode VDn, the power supply ceiling voltage that selects an analog switch Nn for two-way four so also just four monomer battery voltages and, not with battery pack public land (common practices), guaranteed that two-way four selects the supply voltage of an analog switch in safe range, be convenient to circuit expansion, not examined battery cell is counted quantitative limitation.
Claims (5)
1. an online lithium battery Battery pack terminal voltage checkout gear, it is characterized in that: comprise the lithium battery group being composed in series by some single lithium battery, select analog switch, subtracter, A/D change-over circuit and main control chip MCU, the link that each single lithium battery in described lithium battery group is drawn is connected with the input of described selection analog switch, the output of described selection analog switch is connected with the input of described subtracter, the output of described subtracter is connected with the input of A/D change-over circuit, and the output of described A/D change-over circuit is connected with main control chip MCU.
2. a kind of online lithium battery Battery pack terminal voltage checkout gear according to claim 1, is characterized in that: described selection analog switch is four to select an analog switch.
3. a kind of online lithium battery Battery pack terminal voltage checkout gear according to claim 1, is characterized in that: the link that the every two joint single lithium battery in described lithium battery group are drawn is connected with wherein two inputs of described selection analog switch.
4. a kind of online lithium battery Battery pack terminal voltage checkout gear according to claim 1, is characterized in that: the input signal of described subtracter is respectively the voltage signal of adjacent two single lithium battery.
5. a kind of online lithium battery Battery pack terminal voltage checkout gear according to claim 1, is characterized in that: the power supply of described selection analog switch is connected with the negative terminal of described lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420382013.5U CN203967214U (en) | 2014-07-11 | 2014-07-11 | A kind of online lithium battery Battery pack terminal voltage checkout gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420382013.5U CN203967214U (en) | 2014-07-11 | 2014-07-11 | A kind of online lithium battery Battery pack terminal voltage checkout gear |
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| Publication Number | Publication Date |
|---|---|
| CN203967214U true CN203967214U (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420382013.5U Expired - Fee Related CN203967214U (en) | 2014-07-11 | 2014-07-11 | A kind of online lithium battery Battery pack terminal voltage checkout gear |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078718A (en) * | 2014-07-11 | 2014-10-01 | 江苏工程职业技术学院 | Online detection device and method for voltage of battery end of lithium battery pack |
-
2014
- 2014-07-11 CN CN201420382013.5U patent/CN203967214U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078718A (en) * | 2014-07-11 | 2014-10-01 | 江苏工程职业技术学院 | Online detection device and method for voltage of battery end of lithium battery pack |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20180711 |
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| CF01 | Termination of patent right due to non-payment of annual fee |