CN203838316U - Circuit for measuring internal resistance of cell for battery pack management system - Google Patents
Circuit for measuring internal resistance of cell for battery pack management system Download PDFInfo
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- CN203838316U CN203838316U CN201320800701.4U CN201320800701U CN203838316U CN 203838316 U CN203838316 U CN 203838316U CN 201320800701 U CN201320800701 U CN 201320800701U CN 203838316 U CN203838316 U CN 203838316U
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- battery
- current
- voltage
- management system
- internal resistance
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Abstract
The utility model discloses a circuit for measuring the internal resistance of a cell for a battery pack management system. The circuit comprises a battery stack which comprises at least two groups of energy storage battery packs in series connection; battery management systems which are corresponding to the battery packs in a one-one manner and are connected with two ends of each cell of the battery packs, so as to collect the voltage of each cell of the battery packs in a first period in real time; a central control system for an energy storage system, wherein the central control system is connected with the battery stack and the battery management systems through buses so as to collect the current of the negative electrode of the battery stack in a second period in real time, and transmit the current to the battery management systems. The battery management systems store the current and voltage values in a cache manner, and carry out the point-by-point slope processing during charging and discharging so as to obtain the internal resistances of the batteries. Through the above mode, the circuit provided by the utility model needs no exciting or measuring devices for the internal resistances of the batteries, and the current detection and the voltage detection are separated and nonsynchronous, so the circuit is suitable for the all conditions that caused the quick changes of current or voltage in a short time, is convenient for the monitoring of the changes of the internal resistances of the batteries, reduces the devices, and reduces the cost.
Description
Technical field
The utility model relates to energy-accumulating power station and Control of Electric Vehicles field, particularly relates to a kind of internal resistance of cell estimation circuit of batteries management system.
Background technology
Internal resistance is an important technology index weighing battery performance.Battery is when different state of charge, and its internal resistance value is different; Battery is under different serviceable life state, and its internal resistance value is also different.Be no matter that battery is about to inefficacy, off-capacity or discharges and recharges improperly, can changing from its internal resistance, embody.Therefore detect the mode that internal resistance has become popular judgement battery quality.
In existing electric battery, the detection method of the internal resistance of cell is used independent device to carry out battery discharge, number of devices and cost have been increased, and the measurement of voltage and the measurement of electric current require simultaneously, or there is specific measuring condition, as self check electric discharge, the measurement that is the internal resistance of cell is only carried out when self check is discharged, and detects magnitude of voltage record in the time of record current value, is not suitable for the accumulator system of voltage acquisition module and current acquisition module separate detection.
Utility model content
The technical matters that the utility model solves is, a kind of internal resistance of cell estimation circuit of batteries management system is provided, when without increase internal resistance of cell value exciting bank or measurement mechanism, each self-separation of the detection of electric current and voltage and asynchronous, be applicable to all vertiginous situations in the current/voltage short time that cause, the real-time change situation that facilitates monitoring battery internal resistance reduces equipment simultaneously, reduces costs.
For solving the problems of the technologies described above, the utility model embodiment provides a kind of internal resistance of cell estimation circuit of batteries management system, comprising: battery pile, comprises the energy-storage battery group of series connection at least more than two; Battery management system, corresponding one by one with electric battery, the two ends of single battery in connection electric battery, for carrying out Real-time Collection with the period 1 to single battery voltage in electric battery; In accumulator system, control, by bus, be electrically connected to battery pile and battery management system respectively, for the electric current with Real-time Collection battery pile negative pole second round; In accumulator system, control is used for second round to battery management system broadcast transmission current value, battery management system carries out buffer memory for the current value that the control of the magnitude of voltage of collection and accumulator system is issued, and when charge or discharge occur, the current value of buffer memory and magnitude of voltage is carried out to the processing of pointwise slope to obtain the internal resistance R of the single battery in electric battery or electric battery.
Wherein, in accumulator system, control is by the electric current of current detector Real-time Collection battery pile negative pole, and wherein, current detector comprises hall current detector or power divider.
Wherein, are less than or equal to period 1 and second round 50ms.
Pass through such scheme, the beneficial effects of the utility model are: by battery management system with period 1 Real-time Collection single battery voltage and send in accumulator system and control, in accumulator system, control is to gather the electric current of battery pile negative pole second round, and buffer memory electric current and voltage, when discharging and recharging, electric current and voltage are carried out to the processing of pointwise slope to obtain the internal resistance R of single battery in electric battery or electric battery, when without increase internal resistance of cell value exciting bank or measurement mechanism, each self-separation of the detection of electric current and voltage and asynchronous, be applicable to all vertiginous situations in the current/voltage short time that cause, facilitate the real-time change of monitoring battery internal resistance, reduce equipment simultaneously, reduce costs.
Accompanying drawing explanation
Fig. 1 is the internal resistance of cell estimation circuit schematic diagram of the batteries management system of the utility model embodiment;
The schematic diagram that Fig. 2 carries out the calculating of pointwise slope to the magnitude of voltage of buffer memory while being the electric discharge of the utility model embodiment;
The schematic diagram that Fig. 3 carries out the calculating of pointwise slope to the current value of buffer memory while being the electric discharge of the utility model embodiment;
The schematic diagram that Fig. 4 carries out the calculating of pointwise slope to the magnitude of voltage of buffer memory while being the charging of the utility model embodiment;
The schematic diagram that Fig. 5 carries out the calculating of pointwise slope to the current value of buffer memory while being the charging of the utility model embodiment;
Fig. 6 is the schematic flow sheet of internal resistance of cell measuring method of the batteries management system of the utility model embodiment.
Embodiment
Fig. 1 is the internal resistance of cell estimation circuit schematic diagram of the batteries management system of the utility model embodiment.As shown in Figure 1, the internal resistance of cell estimation circuit of the batteries management system of the present embodiment comprises: in battery pile 10, accumulator system, control 16 and at least two above battery management systems 13,14.Wherein, battery pile 10 comprises the energy-storage battery group 11,12 of series connection at least more than two.
Battery management system 13,14 is corresponding one by one with electric battery 11,12, connects the two ends of electric battery 11,12 interior single batteries, with period 1 T
1electric battery 11 or the interior single battery voltage of electric battery 12 are carried out to Real-time Collection.In accumulator system, control 16 and be electrically connected to battery pile 10 and battery management system 13,14 respectively by bus, with T second round
2by the electric current of current detector 15 Real-time Collection battery pile 10 negative poles and with T second round
2the current value gathering to battery management system 13 or battery management system 14 broadcast transmissions.Wherein, current detector 15 comprises hall current detector or power divider, and in accumulator system, controlling 16 can also be substituted by other control device.Battery management system 13 or battery management system 14 carry out buffer memory by controlling 16 current values that issue in the magnitude of voltage of collection and accumulator system.And when charge or discharge occur, the current value of buffer memory and magnitude of voltage are carried out to the processing of pointwise slope to obtain the internal resistance R of single battery in electric battery or battery.Particularly, battery management system 13 or battery management system 14 are searched the first electrical voltage point V
1, second voltage point V
2, the first current point I
1, the second current point I
2, then utilize following relational expression to calculate the internal resistance R:R=(V of electric battery 11 or electric battery 12 interior single batteries
2-V
1)/(I
2-I
1).In other embodiment of the present utility model, the pointwise slope of 14 pairs of current values of battery management system 13 or battery management system and magnitude of voltage calculates and can also be applicable to all rapid situations of change in the current/voltage short time that cause.
In the present embodiment, the magnitude of voltage of battery management system 13 or 14 pairs of buffer memorys of battery management system carries out the calculating of pointwise slope as shown in Fig. 2 or Fig. 4.The schematic diagram that Fig. 2 carries out the calculating of pointwise slope to the magnitude of voltage of buffer memory while being the electric discharge of the utility model embodiment, the schematic diagram that Fig. 4 carries out the calculating of pointwise slope to the magnitude of voltage of buffer memory while being the charging of the utility model embodiment.Calculate successively the slope of adjacent two electrical voltage points, wherein, slope | kv|=| △ v|/T
1, △ v is the difference of two adjacent electrical voltage points, is to be configured according to actual battery, load equipment, charging equipment.When | kv|<|kv
0| time think that magnitude of voltage step is not obvious, wherein, | kv
0| be the slope between initial two adjacent electrical voltage points.Continue to calculate next cycle T
1the difference of the two adjacent electrical voltage points at interval, until work as | kv|>=|kv
0| time think that magnitude of voltage step is obvious, therefore as the slope line 21 in Fig. 2 or the slope line 31 in Fig. 4, select electrical voltage point 22 or electrical voltage point 32 as the first electrical voltage point V
1.This is when the slope of an electrical voltage point is greater than or equal to the slope between initial two adjacent electrical voltage points, and electrical voltage point is the first electrical voltage point V
1.Continue to calculate the slope of adjacent two electrical voltage points, until there is slope | kv|<|kv
0| time think that step completes, therefore as the slope line 23 in Fig. 2 or the slope line 33 in Fig. 4, select electrical voltage point 24 or electrical voltage point 34 as second voltage point V
2.This is when the slope of another electrical voltage point is less than the slope between initial two adjacent electrical voltage points, and another electrical voltage point is second voltage point V
2.In other embodiment of the present utility model, battery management system 13 or battery management system 14 also can calculate the difference of two adjacent electrical voltage points and search the first electrical voltage point V
1with second voltage point V
2.
The current value of battery management system 13 or 14 pairs of buffer memorys of battery management system carries out the calculating of pointwise slope as shown in Fig. 3 or Fig. 5.The schematic diagram that Fig. 3 carries out the calculating of pointwise slope to the current value of buffer memory while being the electric discharge of the utility model embodiment, the schematic diagram that Fig. 5 carries out the processing of pointwise slope to the current value of buffer memory while being the charging of the utility model embodiment.Calculate successively the slope of adjacent two current point, wherein, slope | kI|=| △ I|/T
2, △ I is the difference of two adjacent current point.When | kI|<|kI
0| time think that current value step is not obvious, wherein, | kI
0| be the slope between initial two adjacent current point.Continue to calculate next cycle T
2the difference of the two adjacent current point at interval, until work as | kI|>=|kI
0| time think that current value step is obvious, therefore as the slope line 25 in Fig. 2 or the slope line 35 in Fig. 4, select current point 26 or current point 36 as the first current point I
1.This is when the slope of a current point is greater than or equal to the slope between initial two adjacent current point, and current point is the first current point I
1.Continue to calculate the slope of adjacent two current point, until there is slope | kI|<|kI
0| time think that step completes, therefore as the slope line 27 in Fig. 3 or the slope line 37 in Fig. 5, select current point 28 or current point 38 as the second current point I
2.This is when the slope of another current point is less than the slope between initial two adjacent current point, and another current point is the second current point I
2.In other embodiment of the present utility model, battery management system 13 or battery management system 14 also can calculate the difference of two adjacent current point and search the first current point I
1with the second current point I
2.
In the present embodiment, period 1 T
1with T second round
2unequal, therefore, the variation of voltage and the variation of electric current cannot real-time synchronizations, and magnitude of voltage and the current value of battery management system 13 or 14 pairs of buffer memorys of battery management system carry out separately slope computing, to find the first electrical voltage point V
1, second voltage point V
2, the first current point I
1, the second current point I
2.And period 1 T
1with T second round
2should not be longer, its value is not more than 50ms.Within the regular hour, preferably, in 5 seconds, the asynchronous of change in voltage and curent change is acceptable.If change in voltage and curent change do not occur in acceptable time range, think to change and lose, need to wait for that next charge or discharge carry out internal resistance calculating.
In the present embodiment, the internal resistance computing method of electric battery 11 or electric battery 12 interior all batteries are identical with said method, only when buffer memory electrical voltage point, preserve the magnitude of voltage of each batteries, and preserved magnitude of voltage is carried out to slope and calculate selection electrical voltage point, and current point shares.After the internal resistance of battery management system 13 or battery management system 14 each batteries in calculating electric battery 11 or electric battery 12, by CAN bus, be sent in accumulator system and control 16 for data processing and demonstration.
In the present embodiment, in accumulator system, control 16 with T second round
2the electric current of Real-time Collection battery pile 10 negative poles the current value gathering to battery management system 13 or battery management system 14 broadcast transmissions, battery management system 13 or battery management system 14 are with period 1 T
1the voltage of Real-time Collection electric battery 11 or electric battery 12 interior single batteries, and control 16 current values that issue in the magnitude of voltage that gathers of buffer memory and accumulator system, when charge or discharge occur, the current value of buffer memory and magnitude of voltage are carried out to the processing of pointwise slope to obtain the internal resistance of the single battery in electric battery or electric battery.In circuit without increasing internal resistance of cell value exciting bank or measurement mechanism, each self-separation of the detection of electric current and voltage and asynchronous, is applicable to all vertiginous situations in the current/voltage short time that cause, facilitates the real-time change situation of monitoring battery internal resistance, can reduce equipment, reduce costs simultaneously.
Fig. 6 is the schematic flow sheet of internal resistance of cell measuring method of the batteries management system of the utility model embodiment.As shown in Figure 6, the internal resistance of cell measuring method of the batteries management system of the present embodiment comprises the following steps:
Step S101: with period 1 T
1the voltage of single battery in Real-time Collection buffer memory electric battery, with T second round
2the electric current of Real-time Collection buffer memory battery pile negative pole.
In step S101, period 1 T
1with T second round
2unequal, therefore, the variation of voltage and the variation of electric current cannot real-time synchronizations.In addition, period 1 T
1with T second round
2should not be slower, its value is not more than 50ms.
Step S102: the voltage of buffer memory is carried out to addressing and selection, to search the first electrical voltage point V
1with second voltage point V
2and preserve.
At step S102,, when charging or electric discharge, calculate successively the slope of two adjacent electrical voltage points, when the slope of an electrical voltage point is greater than or equal to the slope between initial two adjacent electrical voltage points, electrical voltage point is the first electrical voltage point V
1.The slope that continues to calculate adjacent two electrical voltage points, when the slope of another electrical voltage point is less than the slope between initial two adjacent electrical voltage points, another electrical voltage point is second voltage point V
2.In other embodiment of the present utility model, can calculate successively the difference of two adjacent electrical voltage points and search the first electrical voltage point V
1with second voltage point V
2.
Step S103: the electric current of buffer memory is carried out to addressing and selection, to search the first current point I
1with the second current point I
2and preserve.
In step S103, when charging or electric discharge, calculate successively the slope of two adjacent current point, when the slope of a current point is greater than or equal to the slope between initial two adjacent current point, current point is the first current point I
1; The slope that continues to calculate adjacent two current point, when the slope of another current point is less than the slope between initial two adjacent current point, another current point is the second current point I
2.In other embodiment of the present utility model, can calculate successively the difference of two adjacent current point and search the first current point I
1with the second current point I
2.
Step S104: according to the first electrical voltage point V
1, second voltage point V
2, the first current point I
1and the second current point I
2utilize following relational expression to calculate the internal resistance R:R=(V of single battery
2-V
1)/(I
2-I
1).
In the present embodiment, in electric battery, the internal resistance computing method of all batteries are identical with said method, only when buffer memory electrical voltage point, preserve the magnitude of voltage of each batteries, and preserved magnitude of voltage carried out to slope and calculate selection electrical voltage point, and current point shares.After the internal resistance of battery management system each batteries in calculating electric battery, by CAN bus, be sent in accumulator system and control for data processing and demonstration.
In the present embodiment, with period 1 T
1gather the also voltage of the interior single battery of buffer memory resistance, with period 1 T
2gather and buffer memory resistance in the electric current of single battery, addressing and the voltage and current of selecting buffer memory carry out calculating after the calculating of pointwise slope the internal resistance of battery when charge or discharge occur again to the current value of buffer memory and magnitude of voltage.In this process without increasing internal resistance of cell value exciting bank or measurement mechanism, each self-separation of the detection of electric current and voltage and asynchronous, be not limited to discharging condition, be applicable to all vertiginous situations in the current/voltage short time that cause, facilitate the real-time change situation of monitoring battery internal resistance, can reduce equipment, reduce costs simultaneously.
In sum, the utility model is gathered Real-time Collection single battery voltage and sends in accumulator system with the period 1 by battery management system and controls, in accumulator system, control is to gather the electric current of battery pile negative pole second round, and buffer memory electric current and voltage, when discharging and recharging, electric current and voltage are carried out to the processing of pointwise slope to obtain the internal resistance R of single battery in electric battery or electric battery, when without increase internal resistance of cell value exciting bank or measurement mechanism, each self-separation of the detection of electric current and voltage and asynchronous, be not limited to discharging condition, be applicable to all vertiginous situations in the current/voltage short time that cause, facilitate the real-time change of monitoring battery internal resistance, can reduce equipment simultaneously, reduce costs.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (3)
1. an internal resistance of cell estimation circuit for batteries management system, is characterized in that, described circuit comprises:
Battery pile, comprises the energy-storage battery group of series connection at least more than two;
Battery management system, corresponding one by one with described electric battery, connect the two ends of single battery in described electric battery, for single battery voltage in described electric battery being carried out to Real-time Collection with the period 1;
In accumulator system, control, by bus, be electrically connected to described battery pile and described battery management system respectively, for the electric current with battery pile negative pole described in second round Real-time Collection;
Wherein, in described accumulator system, control is used for described second round to described battery management system broadcast transmission current value, described battery management system carries out buffer memory for the current value that the control of the magnitude of voltage of collection and described accumulator system is issued, and when charge or discharge occur, the described current value of buffer memory and described magnitude of voltage is carried out to the processing of pointwise slope to obtain the internal resistance R of the single battery in described electric battery or described electric battery.
2. circuit according to claim 1, is characterized in that, in described accumulator system, control is by the electric current of battery pile negative pole described in current detector Real-time Collection, and wherein, described current detector comprises hall current detector or power divider.
3. circuit according to claim 1, is characterized in that, is less than or equal to described period 1 and described second round 50ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800701.4U CN203838316U (en) | 2013-12-06 | 2013-12-06 | Circuit for measuring internal resistance of cell for battery pack management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800701.4U CN203838316U (en) | 2013-12-06 | 2013-12-06 | Circuit for measuring internal resistance of cell for battery pack management system |
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| CN203838316U true CN203838316U (en) | 2014-09-17 |
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| CN201320800701.4U Expired - Fee Related CN203838316U (en) | 2013-12-06 | 2013-12-06 | Circuit for measuring internal resistance of cell for battery pack management system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330639A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Novel industrial UPS battery internal resistance online testing device |
| CN106784481A (en) * | 2016-12-29 | 2017-05-31 | 北京金吕能源科技有限公司 | A kind of hugging stack energy-storage battery storehouse |
| CN110515005A (en) * | 2019-08-13 | 2019-11-29 | 上海欣诣科技有限公司 | A kind of spontaneous combustion early warning system for the electric car in charging pile monitoring charging |
| CN113093036A (en) * | 2019-12-23 | 2021-07-09 | 丰田自动车株式会社 | Battery system |
-
2013
- 2013-12-06 CN CN201320800701.4U patent/CN203838316U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330639A (en) * | 2014-11-26 | 2015-02-04 | 国家电网公司 | Novel industrial UPS battery internal resistance online testing device |
| CN106784481A (en) * | 2016-12-29 | 2017-05-31 | 北京金吕能源科技有限公司 | A kind of hugging stack energy-storage battery storehouse |
| CN110515005A (en) * | 2019-08-13 | 2019-11-29 | 上海欣诣科技有限公司 | A kind of spontaneous combustion early warning system for the electric car in charging pile monitoring charging |
| CN113093036A (en) * | 2019-12-23 | 2021-07-09 | 丰田自动车株式会社 | Battery system |
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| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160321 Address after: 523808, Guangdong District, Songshan hi tech Industrial Development Zone, Dongguan, seven industrial North Road, 1 force science and technology center, 3 floor, B District Patentee after: Dongguan Powerwise Technology Co., Ltd. Address before: 523808 productivity building, Songshan science and Technology Industrial Park, Guangdong, Dongguan Province, room 401-403 Patentee before: Dongguan PowerWise New Energy Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20201206 |