CN211505818U - Battery voltage differential sampling device and battery protection, equalization and formation device - Google Patents
Battery voltage differential sampling device and battery protection, equalization and formation device Download PDFInfo
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- CN211505818U CN211505818U CN201921305860.0U CN201921305860U CN211505818U CN 211505818 U CN211505818 U CN 211505818U CN 201921305860 U CN201921305860 U CN 201921305860U CN 211505818 U CN211505818 U CN 211505818U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of electronics, and discloses a battery voltage differential sampling device and a battery protection, equalization and formation device, which comprises n batteries and voltage sampling chips which are connected in series; the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery; the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery; the voltage sampling chip generates voltage information of an ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery; the defect that the acquired voltage value does not accord with the actual voltage of the single battery due to the impedance of the connecting wire is avoided, and therefore the precision of battery voltage detection is improved.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a battery voltage difference sampling device and battery protection, equilibrium, formation device.
Background
The sampling of the battery is a very key link in the formation and grading of the serial batteries, after the voltage of the battery is sampled and data information is obtained, corresponding judgment is carried out on the basis of the data, and measures are taken to control the cut-in and cut-off of the battery in the serial system. Series battery generally adopts anodal wiring sampling or negative pole wiring sampling when carrying out the sampling of battery cell voltage, and the connecting wire of nevertheless series battery has certain impedance, and battery cell voltage sampling can be influenced by the impedance of connecting wire when discharging when carrying out the charging of series battery, has great influence to the sampling of voltage, and the data of gathering are not accurate enough.
In another mode, a sampling point is arranged between the connecting lines of two adjacent batteries, so that the pressure difference is uniform as much as possible. The method can only reduce the pressure difference between two adjacent batteries, still cannot solve the problem that the acquired voltage value is inconsistent with the actual voltage of the single battery due to the impedance of the connecting wire, the generated error is smaller when the voltage of the low-current battery is acquired, the error can be ignored under the condition of low precision requirement, but when the high-current power battery is involved, the interference voltage value caused by the impedance of the battery connecting wire is very large, and the accuracy of the voltage sampling of the single battery is seriously influenced.
The existing voltage sampling connection mode of series-connected batteries includes two situations, one of which is to adopt a positive electrode connection sampling mode, as shown in fig. 1. The second is to adopt a negative electrode connection sampling mode, as shown in fig. 2.
When the sampling mode is connected by adopting the positive pole, the positive pole is adopted to connect voltage sampling in the power batteries connected in series, the sampling line led out by the 1 st detection end V0 of the voltage sampling chip is connected with the positive pole of the 1 st battery, the sampling line led out by the 2 nd detection end V1 of the voltage sampling chip is connected with the positive pole of the 2 nd battery, and the like in sequence, the sampling line led out by the 7 th detection end V6 of the voltage sampling chip is connected with the positive pole of the 7 th battery, and the sampling line led out by the 8 th detection end V7 of the voltage sampling chip is connected with the negative pole of the 7 th battery.
The voltage VB1 of the 1 st battery is I V1-V0I, the voltage VB2 of the 2 nd battery is I V2-V1I, the voltage VB3 of the 3 rd battery is I V3-V2I, and so on, the voltage VB6 of the 6 th battery is I V6-V5I, and the voltage VB7 of the 7 th battery is I V7-V6I. Namely, the voltage of the ith battery is the difference value between the detection value of the ith detection end of the voltage sampling chip and the detection value of the (i + 1) th detection end of the voltage sampling chip.
The voltage value measured from the 2 nd detecting terminal V1 of the voltage sampling chip to the 7 th detecting terminal VB6 of the voltage sampling chip contains the voltage value caused by the impedance of the series connection line no matter in the charging process or the discharging process. Only the sampled voltage value of the 7 th cell is the actual voltage value of the 7 th cell.
Similarly, the voltage sampling is connected by adopting the negative electrode, only the voltage sampling value of the 1 st battery is accurate, and the voltage sampling value of the 2 nd battery to the voltage sampling value of the 7 th battery all contain the voltage value of the impedance of the series connection line.
Therefore, the traditional voltage differential sampling device for the series-connection component-capacitor battery has the defect that the voltage detection precision of the ground battery is poor due to the fact that the acquired voltage value does not accord with the actual voltage of the single battery caused by the impedance of the connecting wire.
SUMMERY OF THE UTILITY MODEL
The utility model provides a battery voltage difference sampling device and battery protection, equilibrium, formation device aims at solving traditional series connection and becomes that the connecting wire impedance that partial volume battery voltage difference sampling device exists arouses that the voltage value that gathers is inconsistent with battery cell actual voltage to lead to the poor problem of ground battery voltage detection precision.
The utility model discloses a so realized, a series formation partial volume battery voltage differential sampling device, the series formation partial volume battery voltage differential sampling device includes n series connection's battery and voltage sampling chip;
the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery;
the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery;
the voltage sampling chip is used for generating voltage information of the ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery;
wherein i is a natural number not more than n.
In one embodiment, the connection between the 2i-1 th detection end of the voltage sampling chip and the positive electrode of the ith battery is specifically as follows:
and the 2i-1 detection end of the voltage sampling chip is connected with the positive pole of the ith battery.
In one embodiment, the connection between the 2 i-th detection end of the voltage sampling chip and the negative electrode of the i-th battery is specifically:
and the 2i detection end of the voltage sampling chip is connected with the pole of the negative electrode of the i battery.
In one embodiment, the positive electrode of the ith battery is connected with the negative electrode of the (i + 1) th battery through a connecting wire.
The embodiment of the utility model provides a still provide a battery protection device, battery protection device includes as foretell series composition partial volume battery voltage difference sampling device.
The embodiment of the utility model provides a still provide a battery balancing unit, battery balancing unit includes the series connection ization composition partial volume battery voltage difference sampling device as above.
The embodiment of the utility model provides a battery formation device is still provided, battery formation device includes control module, power module, n switching circuits and as above-mentioned series connection formation partial volume battery voltage difference sampling device;
the third input and output end of the ith switching circuit is connected with the anode of the (i-1) th battery and the second input and output end of the (i-1) th switching circuit, the first input and output end of the ith switching circuit is connected with the cathode of the ith battery, the second input and output end of the ith switching circuit is connected with the anode of the ith battery and the third input and output end of the (i + 1) th switching circuit, the third input and output end of the 1 st switching circuit is connected with the anode of the power supply module, and the second input and output end of the nth switching circuit is connected with the anode of the nth battery and the cathode of the power supply module;
the series component-capacity battery voltage differential sampling device is connected with an ith battery and is used for detecting the voltage of the ith battery to generate the voltage information of the ith battery;
the control module is connected with the voltage differential sampling device of the series-connection component-capacitance-grading battery and is used for generating an ith control signal according to the voltage information of the ith battery;
the ith switching circuit is connected with the control module and used for switching to a battery charging loop or a battery charging bypass according to the ith control signal.
Wherein i is a natural number not more than n.
The embodiment of the utility model provides a through including n batteries and the voltage sampling chip of series connection; the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery; the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery; the voltage sampling chip generates voltage information of an ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery; the defect that the acquired voltage value does not accord with the actual voltage of the single battery due to the impedance of the connecting wire is avoided, and therefore the precision of battery voltage detection is improved.
Drawings
In order to more clearly illustrate the technical utility model in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram illustrating an example of a voltage differential sampling apparatus for a series-connected component-capacitance battery provided in the prior art;
fig. 2 is another exemplary circuit diagram of a voltage differential sampling apparatus for a series component-capacitance battery provided in the prior art;
fig. 3 is a circuit diagram illustrating an example of a voltage differential sampling apparatus for a series-connected component-capacitance-divided battery according to an embodiment of the present invention;
fig. 4 is a block diagram of a battery formation device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 shows an example structure diagram of a series component/partial capacity battery voltage differential sampling device provided in an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the voltage differential sampling device for the series-connection component-capacity-grading battery comprises n batteries and a voltage sampling chip which are connected in series; the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery; the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery; the voltage sampling chip is used for generating voltage information of the ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery; wherein i is a natural number not more than n.
The 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery specifically as follows: the 2i-1 detection end of the voltage sampling chip is connected with the positive pole of the ith battery.
Wherein, the 2i detection end of the voltage sampling chip is connected with the negative pole of the ith battery specifically as follows: the 2i detection end of the voltage sampling chip is connected with the pole of the negative pole of the i battery.
In a specific implementation, the positive electrode of the ith battery is connected with the negative electrode of the (i + 1) th battery through a connecting wire.
In fig. 3, the 1 st detection terminal V0 of the voltage sampling chip is connected to the positive electrode of the 1 st cell, and the 2 nd detection terminal V1 of the voltage sampling chip is connected to the negative electrode of the 1 st cell 1; the 3 rd detection terminal V2 of the voltage sampling chip is connected to the anode of the 2 nd battery, the 4 th detection terminal V3 of the voltage sampling chip is connected to the cathode of the 2 nd battery, and so on, the anode of each battery and the cathode of each battery are both connected with sampling lines, when the series-connected batteries are large-current batteries, the impedance of the connecting lines is large, the voltage VB1 of the 1 st battery is V1-V0I, the voltage VB2 of the 2 nd battery is V3-V2I, and so on, the voltage of the ith battery is the difference between the anode voltage of the ith battery and the cathode voltage of the ith battery, that is, the voltage of the ith battery is the difference between the detection value obtained by the 2i-1 th detection terminal of the voltage sampling chip and the detection value of the 2i detection terminal of the voltage sampling chip.
The sampling points are arranged on the positive electrode and the negative electrode of each battery, the voltages of the two electrodes are collected, and then the accurate voltages of the batteries are obtained through difference. The sampling point is directly arranged on the pole of the electrode and is not contacted with the connecting wire in series connection with the battery, the resistance value of the connecting wire cannot influence the accuracy of the voltage of the battery, and the accuracy of data acquisition is further improved.
The novel connection mode is adopted, the chip is not required to be changed, the operation is simple and easy to implement, the accurate measurement of the battery voltage can be completed by utilizing the original port (pin) of the chip, the impedance problem of a connecting line is reduced, and accurate data is obtained.
The embodiment of the utility model provides a still provide a battery protection device, battery protection device includes as foretell series composition partial volume battery voltage difference sampling device.
The embodiment of the utility model provides a still provide a battery balancing unit, battery balancing unit include as above-mentioned series connection ization composition partial volume battery voltage difference sampling device.
The embodiment of the utility model provides a battery formation device is still provided, battery formation device includes control module 04, power module 05, n switching circuit 03i and as above-mentioned series composition partial volume battery voltage difference sampling device 00;
the third input and output end of the ith switching circuit is connected with the anode of the (i-1) th battery and the second input and output end of the (i-1) th switching circuit, the first input and output end of the ith switching circuit is connected with the cathode of the ith battery, the second input and output end of the ith switching circuit is connected with the anode of the ith battery and the third input and output end of the (i + 1) th switching circuit, the third input and output end of the 1 st switching circuit is connected with the anode of the power supply module, and the second input and output end of the nth switching circuit is connected with the anode of the nth battery and the cathode of the power supply module;
the series component-capacitance battery voltage differential sampling device 00 is connected with an ith battery and used for detecting the voltage of the ith battery to generate the voltage information of the ith battery;
the control module 04 is connected with the voltage differential sampling device of the serial component-capacitance battery and is used for generating an ith control signal according to the voltage information of the ith battery;
the ith switching circuit is connected with the control module and used for switching to a battery charging loop or a battery charging bypass according to the ith control signal.
Wherein i is a natural number less than or equal to n
The embodiment of the utility model provides a through including n batteries and the voltage sampling chip of series connection; the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery; the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery; the voltage sampling chip generates voltage information of an ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery; the defect that the acquired voltage value does not accord with the actual voltage of the single battery due to the impedance of the connecting wire is avoided, and therefore the precision of battery voltage detection is improved.
The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. The battery voltage differential sampling device is characterized by comprising n batteries and a voltage sampling chip which are connected in series;
the 2i-1 detection end of the voltage sampling chip is connected with the positive electrode of the ith battery and is used for detecting the voltage of the positive electrode of the ith battery;
the 2i detection end of the voltage sampling chip is connected with the negative electrode of the i battery and is used for detecting the negative electrode voltage of the i battery;
the voltage sampling chip is used for generating voltage information of the ith battery according to the positive voltage of the ith battery and the negative voltage of the ith battery;
wherein i is a natural number not more than n.
2. The battery voltage differential sampling device according to claim 1, wherein the connection of the 2i-1 detection end of the voltage sampling chip and the positive electrode of the ith battery is specifically:
and the 2i-1 detection end of the voltage sampling chip is connected with the positive pole of the ith battery.
3. The battery voltage differential sampling device according to claim 1, wherein the connection of the 2 i-th detection terminal of the voltage sampling chip and the negative electrode of the i-th battery is specifically:
and the 2i detection end of the voltage sampling chip is connected with the pole of the negative electrode of the i battery.
4. The battery voltage differential sampling device of claim 1, wherein the positive electrode of the ith battery is connected to the negative electrode of the (i + 1) th battery through a connection line.
5. A battery protection device, characterized in that it comprises a battery voltage differential sampling device according to any one of claims 1 to 4.
6. A battery equalization apparatus, characterized in that the battery equalization apparatus comprises a battery voltage differential sampling apparatus according to any one of claims 1 to 4.
7. A battery formation device, characterized in that the battery formation device comprises a control module, a power supply module, n switching circuits and a battery voltage differential sampling device according to any one of claims 1 to 4;
the third input and output end of the ith switching circuit is connected with the anode of the (i-1) th battery and the second input and output end of the (i-1) th switching circuit, the first input and output end of the ith switching circuit is connected with the cathode of the ith battery, the second input and output end of the ith switching circuit is connected with the anode of the ith battery and the third input and output end of the (i + 1) th switching circuit, the third input and output end of the 1 st switching circuit is connected with the anode of the power supply module, and the second input and output end of the nth switching circuit is connected with the anode of the nth battery and the cathode of the power supply module;
the battery voltage differential sampling device is connected with the ith battery and used for detecting the voltage of the ith battery to generate the voltage information of the ith battery;
the control module is connected with the battery voltage differential sampling device and used for generating an ith control signal according to the voltage information of the ith battery;
the ith switching circuit is connected with the control module and used for switching to a battery charging loop or a battery charging bypass according to the ith control signal;
wherein i is a natural number not more than n.
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| CN201921305860.0U CN211505818U (en) | 2019-08-12 | 2019-08-12 | Battery voltage differential sampling device and battery protection, equalization and formation device |
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| CN201921305860.0U CN211505818U (en) | 2019-08-12 | 2019-08-12 | Battery voltage differential sampling device and battery protection, equalization and formation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614116A (en) * | 2022-02-28 | 2022-06-10 | 福建星云电子股份有限公司 | Dynamic balance repairing method for battery cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614116A (en) * | 2022-02-28 | 2022-06-10 | 福建星云电子股份有限公司 | Dynamic balance repairing method for battery cell |
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Address after: 518000 1903a, block a, Zhongguan Times Square, 4168 Liuxian Avenue, Pingshan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Patentee after: REPOWER TECHNOLOGY Co.,Ltd. Address before: 4 / F, No.2 factory building, tongfuyu industrial town, Liuxian Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: REPOWER TECHNOLOGY Co.,Ltd. |
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Address after: 518000 floor 11, building A3, Nanshan Zhiyuan, No. 1001, Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Patentee after: REPOWER TECHNOLOGY Co.,Ltd. Address before: 518000 1903a, block a, Zhongguan Times Square, 4168 Liuxian Avenue, Pingshan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Patentee before: REPOWER TECHNOLOGY Co.,Ltd. |