CN204758797U - Lithium ion battery state parameter sampling system - Google Patents
Lithium ion battery state parameter sampling system Download PDFInfo
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- CN204758797U CN204758797U CN201520509900.9U CN201520509900U CN204758797U CN 204758797 U CN204758797 U CN 204758797U CN 201520509900 U CN201520509900 U CN 201520509900U CN 204758797 U CN204758797 U CN 204758797U
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- 238000005070 sampling Methods 0.000 title claims abstract description 117
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 101000697493 Homo sapiens Large proline-rich protein BAG6 Proteins 0.000 description 1
- 101001068634 Homo sapiens Protein PRRC2A Proteins 0.000 description 1
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 description 1
- 102100028047 Large proline-rich protein BAG6 Human genes 0.000 description 1
- 102100033954 Protein PRRC2A Human genes 0.000 description 1
- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model relates to a battery measurement state detects technical field, especially relates to a lithium ion battery state parameter sampling system, and this system is including the analog front end chip that has a N sampling channel, corresponding voltage sample point in every passageway in the N sampling channel, especially, this system still includes: set up in at least one extension voltage sample point with voltage sampling circuit between the reservation IO mouth of analog front end chip. It has effectively utilized the intrinsic reservation IO mouth of analog front end chip itself to realize the extension of voltage sample passageway, and the easy operation of voltage sample circuit, convenience can be used for the analog front end chip of a N sampling channel N+1 and more multichannel sampling to this has realized not changing, not increasing under the prerequisite of analog front end chip (with low costs), and furthest extension sampling channel quantity satisfies practical application ground needs, has reached easy operation, sampling purpose with low costs.
Description
Technical field
The utility model relates to battery charging condition detection technique field, particularly relates to a kind of lithium ion battery state parameter sampling system.
Background technology
Now, lithium ion battery is widely used in electric automobile, normally, due to the characteristic of lithium ion battery, when voltage exceedes or lower than damage or the inefficacy that can cause battery unit and whole electric battery during allowed band.So, when using Li-ion batteries piles as energy source, most important to the voltage detecting of each battery unit.
In fact, even if to the voltage Measurement accuracy of each battery unit, but due to the nuance of parameter when dispatching from the factory of every batteries unit, and internal resistances different in use procedure, different environment temperatures etc., the charging of different battery unit, discharge rate all may be caused different.When they be cascaded composition electric battery and charge time, have percentage of batteries unit to be full of electricity in advance when just likely appearing at charging, and the situation that when discharging, percentage of batteries unit is discharged in advance.Therefore, Li-ion batteries piles must have battery status parameter sampling system to carry out real-time sampling battery status parameter, and then realizes the monitoring to battery state.
In the prior art, in the process of sampling to battery status parameter, special analog front-end chip is usually adopted to gather the voltage of battery.But the sampling channel of analog front-end chip is fixing often, when needing the electrical voltage point gathered to exceed current sampling channel quantity, can only change analog front-end chip or increasing by one piece of analog front-end chip, complicated operation, very inconvenience.And analog front-end chip is often expensive, considerably increase sampling cost.
Utility model content
In view of this, the utility model provides a kind of lithium ion battery state parameter sampling system, to reach simple to operate, the low object of sampling cost.
For solving the problems of the technologies described above, the utility model provides a kind of lithium ion battery state parameter sampling system, comprises the analog front-end chip with N number of sampling channel, the corresponding voltage sample point of each passage in described N number of sampling channel; Especially, this system also comprises:
Be arranged at the voltage sampling circuit between at least one expansion voltage sample point and reserved I/O mouth of described analog front-end chip.
In said system, optionally, the quantity of at least one expansion voltage sample point described is less than or equal to the quantity of described reserved I/O mouth, and described voltage sampling circuit comprises:
First operational amplifier, the inverting input of described first operational amplifier with described at least one expand voltage sample point, in-phase input end is all connected, described in-phase input end is connected to the ground, and output terminal is connected with described reserved I/O mouth.
In said system, optionally, the quantity of at least one expansion voltage sample point described is greater than the quantity of described reserved I/O mouth, and described voltage sampling circuit comprises:
Second operational amplifier, the inverting input of described second operational amplifier with described at least one expand voltage sample point, in-phase input end is all connected, described in-phase input end is connected to the ground, and output terminal is connected with the branch end of multiplexer (MUX;
Described multiplexer (MUX, its common port is connected with described reserved I/O mouth, and described branch end is connected with the output terminal of described second operational amplifier.
In said system, optionally, described voltage sampling circuit carries out voltage sample in time sharing sampling mode at least one expansion voltage sample point described.
In said system, optionally, also comprise current sampling circuit, described current sampling circuit comprises:
Be arranged in series the sampling resistor in the most negative terminal of electric battery;
Be connected across the 3rd operational amplifier between described sampling resistor, described in the in-phase input end of described 3rd operational amplifier to deviate from described sampling resistor through the first build-out resistor, one end of most negative terminal is connected, is connected to the ground through the 7th resistance, inverting input is connected through the second build-out resistor with described sampling resistor one end near described most negative terminal, is connected with output terminal through the 8th resistance, and described output terminal is connected with described reserved I/O mouth.
In said system, optionally, described voltage sampling circuit also comprises:
Be arranged at the first resistance between the in-phase input end of described first operational amplifier and described ground;
Be arranged at the second resistance between the inverting input of described first operational amplifier and described single expansion voltage sample point;
Be arranged at the 3rd resistance between the in-phase input end of described first operational amplifier and inverting input.
In said system, optionally, described voltage sampling circuit also comprises:
Be arranged at the 4th resistance between the in-phase input end of described second operational amplifier and described ground;
Be arranged at the 5th resistance between the inverting input of described second operational amplifier and described single expansion voltage sample point;
Be arranged at the 6th resistance between the in-phase input end of described second operational amplifier and inverting input.
To sum up, in the lithium ion battery state parameter sampling system that the utility model provides, analog front-end chip has N number of sampling channel, and the corresponding voltage sample point of each passage; Especially, between expansion voltage sample point and the reserved I/O mouth of described analog front-end chip, introduce voltage sampling circuit, wherein, effectively make use of analog front-end chip reserved I/O mouth inherently to realize the expansion of voltage sample passage.Above technical scheme is by the expansion (expansion voltage sampling circuit simple, convenient) of peripheral circuit, the analog front-end chip of N number of sampling channel can be used for the sampling of N+1 and more multichannel (in practical application, the upper limit of concrete sampling channel expansion depends on the sampling interval of actual requirement), under the prerequisite achieve not changing with this, not increasing analog front-end chip (cost is low), expand sampling channel quantity to greatest extent, with meeting practical application needs, reach simple to operate, that sampling cost is low object.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the electrical block diagram of a kind of lithium ion battery state parameter of the utility model sampling system embodiment 1;
Fig. 2 is the structural representation of voltage sampling circuit in a kind of lithium ion battery state parameter of the utility model sampling system embodiment 2;
Fig. 3 is the structural representation of voltage sampling circuit in a kind of lithium ion battery state parameter of the utility model sampling system embodiment 3;
Fig. 4 is the structural representation of current sampling circuit in a kind of lithium ion battery state parameter of the utility model sampling system embodiment 4.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Core of the present utility model is to provide a kind of lithium ion battery state parameter sampling system, to reach simple to operate, the low object of sampling cost.
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
With reference to figure 1, show the electrical block diagram of a kind of lithium ion battery state parameter of the utility model sampling system embodiment 1, as can be seen from the figure, lithium ion battery state parameter sampling system comprises the analog front-end chip 100 with N number of sampling channel, the corresponding voltage sample point of each passage in this N number of sampling channel; Especially, this system also comprises the voltage sampling circuit 101 be arranged between at least one expansion voltage sample point and reserved I/O mouth of analog front-end chip 100.
Wherein, BAT1, BAT2, BAT3 ... BATN is voltage sample point, and N is the sampling channel number of analog front-end chip 100; BATN1, BATN2 ... for expansion voltage sample point, expansion voltage sample point refers to the voltage sample point except being undertaken except N number of voltage sample point of sampling by analog front-end chip 100 in the voltage sample point needing to gather, the quantity of expansion voltage sample point can be one, two or more, but in actual applications, the upper limit of sampling channel expansion depends on the sampling interval of actual requirement.
Above technical scheme is by the expansion (expansion voltage sampling circuit 101 simple, convenient) of peripheral circuit, the analog front-end chip 100 of N number of sampling channel can be used for the sampling of N+1 and more multichannel, effectively make use of analog front-end chip 100 reserved I/O mouth inherently to realize the expansion of voltage sample passage, under the prerequisite achieve not changing with this, not increasing analog front-end chip 100 (cost is low), expand sampling channel quantity to greatest extent, with meeting practical application needs, reach simple to operate, that sampling cost is low object.
Based on lithium ion battery state parameter sampling system disclosed in above-described embodiment, further, fixing based on the limited amount of the reserved I/O mouth of analog front-end chip 100, and a corresponding expansion voltage sample point of reserved I/O mouth, so, at least one is expanded to the quantitative relation of voltage sample point and reserved I/O mouth, there will be the one in following two kinds of situations: a kind of quantity being the quantity of at least one expansion voltage sample point and being less than or equal to reserved I/O mouth, another kind is the quantity that the quantity of at least one expansion voltage sample point is greater than reserved I/O mouth.And in different situations, the particular content of voltage sampling circuit 101 is different.
Quantity at least one expansion voltage sample point is less than or equal to the situation of the quantity of reserved I/O mouth, the utility model provides a kind of lithium ion battery state parameter sampling system embodiment 2, voltage sampling circuit 101 comprises the first operational amplifier, wherein, inverting input and at least one of first operational amplifier expand voltage sample point, in-phase input end is all connected, the in-phase input end of the first operational amplifier is connected to the ground, and output terminal is connected with reserved I/O mouth.In fact, technique scheme at least one expansion voltage sample point generally, first operational amplifier contains the operational amplifier of at least one expansion voltage sample point quantity, and the first operational amplifier connects between all expansion voltage sample points and all reserved I/O mouths.
Further, for the single expansion voltage sample point at least one expansion voltage sample point, with reference to figure 2, the inverting input of an operational amplifier is connected with expansion voltage sample point BATN1, and output terminal is connected with a reserved I/O mouth.Particularly, the voltage collected at expansion voltage sample point BATN1 is negative value, by operational amplifier be converted on the occasion of, make it meet the input range of analog front-end chip 100.Then the output of operational amplifier is received the reserved I/O mouth of analog front-end chip 100, realize the expansion of voltage sample passage.
Further, in actual applications, voltage sampling circuit 101 also comprises: be arranged at the first resistance R1 between the in-phase input end of the first operational amplifier and ground; Be arranged at the second resistance R2 between the inverting input of the first operational amplifier and expansion voltage sample point BATN1; Be arranged at the 3rd resistance R3 between the in-phase input end of the first operational amplifier and inverting input.Other expansion voltage sample point by that analogy, repeats no more herein.
Quantity at least one expansion voltage sample point is greater than the situation of the quantity of reserved I/O mouth, the utility model provides a kind of lithium ion battery state parameter sampling system embodiment 3, when reserved I/O negligible amounts, when still cannot meet actual needs, then add multiplexer (MUX, voltage sampling circuit 101 comprises the second operational amplifier and multiplexer (MUX, wherein, the inverting input of the second operational amplifier and at least one expand voltage sample point, in-phase input end is all connected, the in-phase input end of the second operational amplifier is connected to the ground, output terminal is connected with the branch end of multiplexer (MUX, the common port of multiplexer (MUX is connected with reserved I/O mouth, and branch end is connected with the output terminal of the first operational amplifier.And, due in the normal use procedure of electric battery, cell voltage rate of change is slower, time sharing sampling scheme is adopted to there is no impact for the real-time detection of cell voltage, time sharing sampling scheme can be determined according to actual samples interval, so voltage sampling circuit 101 carries out voltage sample in time sharing sampling mode at least one expansion voltage sample point, realize with a reserved I/O mouth sampling multiple cell voltage.
Similar with the first operational amplifier in above-described embodiment, technical scheme equally at least one expansion voltage sample point generally herein, second operational amplifier contains the operational amplifier of at least one expansion voltage sample point quantity, the quantity of multiplexer (MUX is at least one, the branch road total quantity of the branch end of multiplexer (MUX is greater than or equal at least one expansion voltage sample point quantity, and the second operational amplifier, multiplexer (MUX connect between all expansion voltage sample points and all reserved I/O mouths.
Further, for the single expansion voltage sample point at least one expansion voltage sample point, with reference to figure 3, the inverting input of an operational amplifier is connected with expansion voltage sample point BATN1 ＇, output terminal is connected with a branch road of multiplexer (MUX, and the common port of multiplexer (MUX is connected with a reserved I/O mouth.And, add MUX, adopt time sharing sampling scheme, with a reserved I/O mouth sampling multiple cell voltage, namely utilize the existing sampling to multiple expansion voltage sample point of a reserved I/O cause for gossip, the branch road quantity of the branch end of a MUX determines a reserved I/O mouth and can sample to how many expansion voltage sample points.
Further, in actual applications, voltage sampling circuit 101 also comprises the 4th resistance R4 between in-phase input end and ground being arranged at the second operational amplifier; Be arranged at the 5th resistance R5 between the inverting input of the second operational amplifier and expansion voltage sample point BATN1 ＇; Be arranged at the 6th resistance R6 between the in-phase input end of the second operational amplifier and inverting input.Other expansion voltage sample point by that analogy, repeats no more herein.
Based on technical scheme disclosed in the various embodiments described above, use extra current sample chip to gather charging and discharging currents for needing in prior art, add the technical matters of the cost of product, the utility model additionally provides a kind of lithium ion battery state parameter of the utility model sampling system embodiment 4, to solve the problems of the technologies described above.With reference to figure 4, the utility model lithium ion battery state parameter sampling system also comprises current sampling circuit, and this current sampling circuit comprises: be arranged in series the sampling resistor R in the most negative terminal of electric battery; Be connected across the 3rd operational amplifier between sampling resistor R, one end that the in-phase input end of the 3rd operational amplifier deviates from most negative terminal through the first build-out resistor R11 and sampling resistor R is connected, is connected to the ground through the 7th resistance R7, inverting input is connected through the second build-out resistor R22 and sampling resistor R near one end of most negative terminal, is connected with output terminal through the 8th resistance R8, and output terminal is connected with reserved I/O mouth.
Particularly, when needs carry out current sample, at the most negative terminal access sampling resistor of electric battery, and two ends of sampling resistor are received the 3rd operational amplifier two ends, centre seals in build-out resistor.By changing design parameter, the input range exporting analog front-end chip 100 to of adjustment the 3rd operational amplifier, realizes battery pack current sampling.Relative to the parameter such as voltage, temperature, current sample is higher to requirement of real-time, and generally this passage does not adopt time sharing sampling.
The lithium ion battery state parameter sampling system that comprehensive above-mentioned the utility model provides, by the expansion of peripheral circuit, can be used for the sampling of N+1 and more multichannel by the AFE (analog front end) of N number of sampling channel.The utility model can expand sampling channel quantity, with meeting practical application needs to greatest extent not changing under the prerequisite not increasing AFE (analog front end).Meanwhile, the utility model achieves current sample under the prerequisite not increasing current sample chip, greatly reduces cost.
Above lithium ion battery state parameter sampling system provided by the utility model is described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (7)
1. a lithium ion battery state parameter sampling system, comprises the analog front-end chip with N number of sampling channel, the corresponding voltage sample point of each passage in described N number of sampling channel; It is characterized in that, this system also comprises:
Be arranged at the voltage sampling circuit between at least one expansion voltage sample point and reserved I/O mouth of described analog front-end chip.
2. the system as claimed in claim 1, is characterized in that, the quantity of at least one expansion voltage sample point described is less than or equal to the quantity of described reserved I/O mouth, and described voltage sampling circuit comprises:
First operational amplifier, the inverting input of described first operational amplifier with described at least one expand voltage sample point, in-phase input end is all connected, described in-phase input end is connected to the ground, and output terminal is connected with described reserved I/O mouth.
3. the system as claimed in claim 1, is characterized in that, the quantity of at least one expansion voltage sample point described is greater than the quantity of described reserved I/O mouth, and described voltage sampling circuit comprises:
Second operational amplifier, the inverting input of described second operational amplifier with described at least one expand voltage sample point, in-phase input end is all connected, described in-phase input end is connected to the ground, and output terminal is connected with the branch end of multiplexer (MUX;
Described multiplexer (MUX, its common port is connected with described reserved I/O mouth, and described branch end is connected with the output terminal of described second operational amplifier.
4. system as claimed in claim 3, is characterized in that, described voltage sampling circuit carries out voltage sample in time sharing sampling mode at least one expansion voltage sample point described.
5. the system as described in Claims 1-4 any one, is characterized in that, also comprises current sampling circuit, and described current sampling circuit comprises:
Be arranged in series the sampling resistor in the most negative terminal of electric battery;
Be connected across the 3rd operational amplifier between described sampling resistor, described in the in-phase input end of described 3rd operational amplifier to deviate from described sampling resistor through the first build-out resistor, one end of most negative terminal is connected, is connected to the ground through the 7th resistance, inverting input is connected through the second build-out resistor with described sampling resistor one end near described most negative terminal, is connected with output terminal through the 8th resistance, and described output terminal is connected with described reserved I/O mouth.
6. system as claimed in claim 2, it is characterized in that, described voltage sampling circuit also comprises:
Be arranged at the first resistance between the in-phase input end of described first operational amplifier and described ground;
Be arranged at the second resistance between the inverting input of described first operational amplifier and described single expansion voltage sample point;
Be arranged at the 3rd resistance between the in-phase input end of described first operational amplifier and inverting input.
7. system as claimed in claim 3, it is characterized in that, described voltage sampling circuit also comprises:
Be arranged at the 4th resistance between the in-phase input end of described second operational amplifier and described ground;
Be arranged at the 5th resistance between the inverting input of described second operational amplifier and described single expansion voltage sample point;
Be arranged at the 6th resistance between the in-phase input end of described second operational amplifier and inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520509900.9U CN204758797U (en) | 2015-07-14 | 2015-07-14 | Lithium ion battery state parameter sampling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520509900.9U CN204758797U (en) | 2015-07-14 | 2015-07-14 | Lithium ion battery state parameter sampling system |
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| CN204758797U true CN204758797U (en) | 2015-11-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931894A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | System for sampling lithium ion battery state parameters |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931894A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | System for sampling lithium ion battery state parameters |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Shen Baoxing Inventor after: Chen Panxia Inventor after: Zhao Huanwei Inventor after: Mao Jianwei Inventor after: Li Liang Inventor after: Li Bo Inventor after: Zhang Fan Inventor after: Zheng Zhengxian Inventor after: Su Fang Inventor after: Zhu Jinwei Inventor after: Zhou Bin Inventor before: Zhang Fan Inventor before: Zheng Zhengxian Inventor before: Su Fang Inventor before: Zhu Jinwei Inventor before: Zhou Bin Inventor before: Chen Panxia Inventor before: Zhao Huanwei |
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| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160224 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: ELECTRIC AUTOMOBILE SERVICE BRANCH, STATE GRID ZHEJIANG ELECTRIC POWER COMPANY Patentee after: Hangzhou Power Supply Company, State Grid Zhejiang Electric Power Company Patentee after: Hangzhou Dayou Technology Development Co., Ltd. Patentee after: Hangzhou Bmser Technology Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: Hangzhou Power Supply Company, State Grid Zhejiang Electric Power Company Patentee before: Hangzhou Dayou Technology Development Co., Ltd. Patentee before: Hangzhou Bmser Technology Co., Ltd. |