CN210690776U - Battery monomer voltage determination system of power battery and automobile - Google Patents
Battery monomer voltage determination system of power battery and automobile Download PDFInfo
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- CN210690776U CN210690776U CN201920990053.0U CN201920990053U CN210690776U CN 210690776 U CN210690776 U CN 210690776U CN 201920990053 U CN201920990053 U CN 201920990053U CN 210690776 U CN210690776 U CN 210690776U
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Abstract
The utility model relates to a power battery's battery monomer voltage determination system and car to stride when solving among the prior art battery monomer voltage and adopt the problem of the monomer voltage acquisition error that the copper bar collection arouses. The system comprises: the power battery comprises a plurality of battery modules which are arranged in series, each battery module comprises a plurality of battery monomers which are connected in sequence, and a first battery monomer positioned at the last position in a previous battery module in two adjacent battery modules is connected with a second battery monomer positioned at the initial position in a next battery module through a connecting piece; the voltage acquisition device comprises a voltage acquisition device with a plurality of voltage acquisition channels, wherein the voltage acquisition channels are respectively arranged at the positive electrode and the negative electrode of an initial battery monomer positioned at the initial position in all battery monomers of the power battery, and the voltage acquisition channels are respectively arranged at the positive electrode or the negative electrode of the rest battery monomers in the plurality of battery monomers; a current collector; and the processor is respectively connected with the voltage collector and the current collector.
Description
Technical Field
The utility model relates to a power battery monomer voltage gathers the field, specifically is a power battery's battery monomer voltage confirms system and car.
Background
The automobile is used as an important travel vehicle, brings great convenience to the life of people, and brings a plurality of negative effects such as environmental pollution, energy consumption and the like. With the development of the times and the improvement of the living standard of people, people are more and more aware of: maintaining ecological balance and protecting environment are fundamental problems related to human survival and social development. New energy automobiles are used as development alternative energy sources, and an important ring of sustainable development low-carbon society is built, so that the new energy automobiles are more and more highly emphasized by countries in the world.
The power battery has been receiving wide attention in the industry as one of the core components of new energy vehicles. As is well known, a power battery is formed by connecting a plurality of modules in series and parallel, and the modules are connected through copper (aluminum) bars, and the copper (aluminum) bars connected between the modules may be brought into single voltage collection together due to hardware constraints or voltage collection point distribution, which may cause a series of problems: such as the charging can not be fully charged, the discharging can not be drained, the dynamic pressure difference is overlarge, the driving mileage is shortened, etc. If the span-mining copper (aluminum) row is too long, the problems of false alarm faults and the like are easily caused. Therefore, how to divide the voltage difference caused by the single voltage across copper (aluminum) row acquisition is marked, so that the rationality of the processor algorithm is ensured, and the problem faced by processor developers is solved.
In the prior art, when acquiring the voltage of a single battery, in order to save the voltage acquisition channels of the monitoring chip, the other channels except the first voltage acquisition cathode only acquire the positive electrode of the single battery, and the single battery voltage value is obtained by the difference between the acquisition values of the two voltage acquisition channels. This just leads to connecting copper (aluminium) row between the module and bringing into monomer voltage collection in the lump when striding module collection monomer voltage, and common solution all sets up voltage acquisition passageway for crossing when module collection monomer voltage at copper (aluminium) row both ends, can avoid connecting copper (aluminium) row between the module and bring the influence that monomer voltage collection brought, but also can increase monitor chip's voltage acquisition passageway simultaneously, and the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power battery's battery monomer voltage system of confirming and car to stride when solving among the prior art battery monomer voltage and adopt the problem of the monomer voltage collection error that the copper bar collection arouses.
The technical scheme of the utility model is that:
this experiment is novel to provide a power battery's battery monomer voltage confirms system, include:
the power battery comprises a plurality of battery modules which are arranged in series, each battery module comprises a plurality of battery monomers which are connected in sequence, and a first battery monomer positioned at the last position in a previous battery module in two adjacent battery modules is connected with a second battery monomer positioned at the initial position in a next battery module through a connecting piece;
the voltage collector is used for collecting voltage and is provided with a plurality of voltage collecting channels, one voltage collecting channel is respectively arranged at the positive electrode and the negative electrode of the initial single battery at the initial position in all the single batteries of the power battery, and one voltage collecting channel is respectively arranged at the positive electrode or the negative electrode of the rest single batteries in the plurality of single batteries;
the current collector is used for collecting current;
and the processor is respectively connected with the voltage collector and the current collector.
Preferably, the processor determines the voltage of the second battery cell through a positive electrode voltage collected by a voltage collecting channel arranged at the positive electrode of the second battery cell, a positive electrode voltage collected by a voltage collecting channel arranged at the positive electrode of the first battery cell, a current collected by the current collector and passing through the second battery cell, the resistance of the connecting member, and contact resistances of the connecting member and respective contact positions of the first battery cell and the second battery cell.
Preferably, the processor determines the voltage of the initial battery cell by determining the voltage of the initial battery cell at the positive and negative voltages of the initial battery cell;
for the remaining battery cells after the plurality of battery cells, the processor determines the voltage of the next battery cell through the negative voltage of the next battery cell and the negative voltage of the previous battery cell, or determines the voltage of the next battery cell through the positive voltage of the next battery cell and the positive voltage of the previous battery cell.
Preferably, the connecting piece is a connecting copper bar or a connecting aluminum bar.
According to the utility model discloses an on the other hand, the utility model also provides an automobile, including foretell power battery's battery cell voltage determination system.
The utility model has the advantages that:
the scheme of this application can avoid arranging the connection copper (aluminium) between the battery module 1 and incorporate monomer voltage collection under the condition of the voltage collection passageway 31 that does not increase monitoring chip (voltage collector 3). The principle is that the resistance value R of the copper (aluminum) busbar connected between the modules is calculated by the resistance calculation formula R ═ rho/SConnecting pieceAnd then the contact resistance R of the two ends of the copper (aluminum) bar and the moduleContact pointThe increase △ R (R) of resistance value caused by the copper (aluminum) connection between the modules is obtainedConnecting pieceAnd RContact pointThe resistance and the value of the voltage value are multiplied by the charging and discharging current I (the charging is positive and the charging is negative), voltage value increment △ V caused by connecting copper (aluminum) between modules is obtained, the voltage value △ V increment is removed from the single voltage value collected across the copper (aluminum) row, and a real single voltage value is obtained.
Drawings
Fig. 1 is a block diagram of the system of the present invention;
description of reference numerals: 1. a battery module; 11. a battery cell; 111. a first battery cell; 112. a second battery cell; 113. initiating a battery cell; 2. a connecting member; 3. a voltage collector; 31. a voltage acquisition channel; 4. a current collector; 5. a processor.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1, the present experiment provides a battery cell voltage determination system for a power battery, including:
the power battery comprises a plurality of battery modules 1 which are arranged in series, each battery module 1 comprises a plurality of battery monomers 11 which are connected in sequence, and a first battery monomer 111 positioned at the last position in a previous battery module 1 in two adjacent battery modules 1 is connected with a second battery monomer 112 positioned at the initial position in a next battery module 1 through a connecting piece 2;
the voltage collector 3 is used for collecting voltage and comprises a plurality of voltage collecting channels 31, wherein one voltage collecting channel 31 is respectively arranged at the positive electrode and the negative electrode of the initial battery cell 113 positioned at the initial position in all the battery cells 11 of the power battery, and one voltage collecting channel 31 is respectively arranged at the positive electrode or the negative electrode of the rest battery cells 11 in the plurality of battery cells 11; a current collector 4 for collecting current; and the processor 5 is connected with the voltage collector 3 and the current collector 4 respectively.
The battery modules 1 are connected with each other through a connecting member (such as a connecting copper bar or a connecting aluminum bar), that is, the first battery cell 111 and the second battery cell 112 in two adjacent battery modules 1 are connected with each other through the connecting member.
Voltage collector 3 is multichannel direct current voltage collection system, and the device can realize arbitrary direct current voltage multichannel independent measurement, in this application, except all being provided with a voltage acquisition channel 31 to the positive pole of first battery monomer 11 and negative pole department, only set up a voltage acquisition channel 31 in the positive pole of remaining battery monomer 11 or negative pole department, this for prior art, can reduce the quantity of voltage acquisition channel 31. For the voltage collector 3, the cost price of the voltage collecting channels 31 with different numbers is also greatly different, and compared with the voltage collecting mode in the prior art, the voltage collecting mode in the application can reduce the use of about half of the voltage collecting channels 31, and relatively speaking, the required cost can be greatly reduced.
The battery management system is provided with a voltage monitoring chip with a multi-channel voltage acquisition function and a processing module for performing voltage calculation, that is, in this embodiment, the voltage acquisition device and the processor are integrated in the same battery management system.
The current collector 4 is a current sensor, and the current sensor detects the current passing through the circuit when the battery is charged and discharged, and for the power battery, only one current collector 4 is needed for a row of a plurality of battery modules 1 connected in series.
As shown in fig. 1, all the battery cells 11 in the power battery are classified into 4 types, one type is an initial battery cell 113 located at a starting position, one type is a battery cell 11 in one battery module 1 connected to a next battery module 1 through a connecting member 2, and is referred to as a first battery cell 111, one type is a battery cell 11 in one battery module 1 connected to a first battery cell 111 in a previous battery module 1 through a connecting member 2, and is referred to as a second battery cell 112, and the remaining battery cells 11 except the battery cells 11 of the above three types are classified into the 4 th type.
For the initial battery cell 113, the difference between the positive voltage V1+ and the negative voltage V1-of the initial battery cell 113 collected by the voltage collector 3 is used as the cell voltage value of the initial battery cell 113.
For the remaining battery cells 11 after the plurality of battery cells 11, the processor 5 determines the voltage of the next battery cell 11 from the negative voltage of the next battery cell 11 and the negative voltage of the previous battery cell 11, or determines the voltage of the next battery cell 11 from the positive voltage of the next battery cell 11 and the positive voltage of the previous battery cell 11. For example, in fig. 1, for the next battery cell 11 located after the initial battery cell 113, the cell voltage of the second battery cell 11 is determined by the difference between the positive electrode voltage V2+ at the positive electrode of the second battery cell 11 and the positive electrode voltage V1+ at the positive electrode of the initial battery cell 113.
The first battery cell 111 has the same cell voltage determination method as that of the battery cell 11 of the above-described category 4. For example, in fig. 1, the cell voltage of the first battery cell 111 located at the 4 th position is determined by the difference between the positive electrode voltage V4+ and the positive electrode voltage V3 +.
For the second battery cell 112, the processor 5 determines the voltage of the second battery cell 112 through the positive voltage collected by the voltage collecting channel 31 disposed at the positive electrode of the second battery cell 112, the positive voltage collected by the voltage collecting channel 31 disposed at the positive electrode of the first battery cell 111, the current collected by the current collector 4 through the second battery cell 112, the resistance of the connecting member 2, and the contact resistance of the connecting member 2 at the respective contact positions of the first battery cell 111 and the second battery cell 112. Specifically, the formula is:
Umonomer＝UCollecting+I(RConnecting piece+2RContact point)
In the formula of UMonomerThe voltage value of the battery cell 11 to be measured; u shapeCollectingDetermining the voltage of the next battery monomer 11 according to the negative voltage of the next battery monomer 11 and the negative voltage of the previous battery monomer 11, or determining the voltage of the next battery monomer 11 according to the positive voltage 11 of the next battery monomer and the positive voltage of the previous battery monomer for the voltage acquisition value of the battery monomer acquired by the voltage acquirer 3 in the battery management system; i isIs the value of the current flowing through the connecting piece 2, wherein the current I is positive during discharging and negative during charging; rConnecting pieceFor the resistance value of the connection 2, by RConnecting pieceρ l/S, where ρ is the resistivity of the connection 2, l is the length of the connection 2, and S is the cross-sectional area of the connection 2; rContact pointThe contact resistance value of the connection of the connector 2 to the battery module 1. For example, in fig. 1, for the 5 th battery cell 11, which is the second battery cell 112, when calculating the actual voltage value of the second battery cell 112, the voltage collector 3 is required to collect the positive voltage V5+ of the second battery cell 112 and the positive voltage V4+ of the first battery cell 111, and the U is obtained by the difference between the positive voltage V5+ and the positive voltage V4+Collecting. Meanwhile, the current collector 4 collects the current flowing through the connection member 2. Resistance R for the connection 2Connecting pieceAnd contact resistance R of the connecting member 2 and the battery module 1Contact pointMay be pre-stored in the processor 5.
As shown in fig. 1, in the present embodiment, the voltage determination device for the battery cell 11 is constituted by a battery management system, a copper (aluminum) row (connector 2), and a plurality of battery modules 1 (exemplified by 1P 4S). The battery management system collects the monomer voltage through a monitoring chip (voltage collector 3), the monomer voltage of each battery monomer 11 of the No. 1 battery module and the No. 2 battery module is collected by the same monitoring chip (voltage collector 3), the connection mode of the voltage collecting channels 31 is as described above, except that the initial battery monomer 113 has a negative collecting channel, the rest voltage collecting channels 31 only collect the voltage positive pole of the battery monomer, and the monomer voltage value is obtained by the difference of the collecting values of the two voltage collecting channels. This results in the copper (aluminum) busbar connected between the battery modules 1 and 2 being included in the cell voltage acquisition of the fifth battery cell 11 when the monitoring chip acquires the cell voltage of No. 5.
For this reason, the battery management system is divided into two cases in the cell voltage collection of the battery cell 11: and collecting the voltage of the single body crossing the copper (aluminum) row and collecting the voltage of the single body not crossing the copper (aluminum) row. Cell voltage of cells 11 not across a copper (aluminum) row collected by a battery management system (as for the initial cell in fig. 1)The cell voltage of the cell 113, the cell voltage collection value is the value obtained by subtracting V1-from V1+, which is the real cell voltage value, and can directly participate in the operation of the battery management system. The cell voltage of the cell 11 across the copper (aluminum) row directly collected by the battery management system (for example, for the 5 th cell in fig. 1, the cell voltage collection value U thereofCollectingA value obtained by subtracting V4+ from V5 +)), and also includes the resistance across the copper (aluminum) row and the additional voltage value caused by the contact resistance between both ends of the copper (aluminum) row and the battery module 1. In order to ensure the reasonability of the algorithm of the battery management system, the voltage values caused by the contact resistance of the copper (aluminum) bar and the two ends of the copper (aluminum) bar are marked before the single voltage acquisition value is calculated.
The specific marking method is to obtain a single voltage acquisition value U of the battery management systemCollectingThe extra voltage value formed by the contact resistance at the two ends of the copper (aluminum) bar and the copper (aluminum) bar in the charging and discharging process is reduced to obtain the real monomer voltage value UMonomer。
The above embodiment of the utility model provides an above, can avoid arranging the connection copper (aluminium) between the battery module 1 and incorporate monomer voltage collection under the condition of the voltage acquisition passageway 31 that does not increase monitor chip (voltage collector 3). The principle is that the resistance value R of the copper (aluminum) busbar connected between the modules is calculated by the resistance calculation formula R ═ rho/SConnecting pieceAnd then the contact resistance R of the two ends of the copper (aluminum) bar and the moduleContact pointThe increase △ R (R) of resistance value caused by the copper (aluminum) connection between the modules is obtainedConnecting pieceAnd RContact pointThe resistance and the value of the voltage value are multiplied by the charging and discharging current I (the charging is positive and the charging is negative), voltage value increment △ V caused by connecting copper (aluminum) between modules is obtained, the voltage value △ V increment is removed from the single voltage value collected across the copper (aluminum) row, and a real single voltage value is obtained.
According to the utility model discloses an on the other hand, the utility model also provides an automobile, including foretell power battery's battery cell voltage determination system.
Claims (5)
1. A cell voltage determination system for a power cell, comprising:
the power battery comprises a plurality of battery modules (1) which are connected in series, each battery module (1) comprises a plurality of battery monomers (11) which are connected in sequence, and a first battery monomer (111) positioned at the last position in a previous battery module (1) in two adjacent battery modules (1) is connected with a second battery monomer (112) positioned at the initial position in a next battery module (1) through a connecting piece (2);
the voltage collector (3) is used for collecting voltage and is provided with a plurality of voltage collecting channels (31), one voltage collecting channel (31) is arranged at the positive pole and the negative pole of an initial single battery (113) positioned at the initial position in all the single batteries (11) of the power battery, and one voltage collecting channel (31) is arranged at the positive pole or the negative pole of the rest single batteries (11) in the plurality of single batteries (11);
a current collector (4) for collecting current;
and the processor (5), the processor (5) is respectively connected with the voltage collector (3) and the current collector (4).
2. The system according to claim 1, wherein the processor (5) determines the voltage of the second battery cell (112) by means of a positive electrode voltage collected by a voltage collecting channel (31) provided at the positive electrode of the second battery cell (112), a positive electrode voltage collected by a voltage collecting channel (31) provided at the positive electrode of the first battery cell (111), a current collected by the current collector (4) through the second battery cell (112), a resistance of the connecting member (2), and contact resistances of the connecting member (2) and respective contact positions of the first battery cell (111) and the second battery cell (112).
3. The system of claim 1,
the processor (5) determines the voltage of the initial battery cell (113) by the positive electrode voltage and the negative electrode voltage of the initial battery cell (113);
for the remaining battery cells (11) after the plurality of battery cells (11), the processor (5) determines the voltage of the next battery cell (11) through the negative voltage of the next battery cell (11) and the negative voltage of the previous battery cell (11), or determines the voltage of the next battery cell (11) through the positive voltage of the next battery cell (11) and the positive voltage of the previous battery cell (11).
4. The system according to claim 1, characterized in that the connecting piece (2) is a connecting copper bar or a connecting aluminum bar.
5. An automobile characterized by comprising the cell voltage determination system of the power battery of any one of claims 1 to 4.
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| CN201920990053.0U CN210690776U (en) | 2019-06-28 | 2019-06-28 | Battery monomer voltage determination system of power battery and automobile |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253127A (en) * | 2021-05-10 | 2021-08-13 | 宝能(广州)汽车研究院有限公司 | Voltage acquisition method of battery pack and electric vehicle |
| CN117169753A (en) * | 2023-11-03 | 2023-12-05 | 合肥国轩高科动力能源有限公司 | Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment |
| CN117805642A (en) * | 2024-02-29 | 2024-04-02 | 双一力(宁波)电池有限公司 | Voltage acquisition method and device for battery cell, processor and storage medium |
| CN118444171A (en) * | 2024-07-05 | 2024-08-06 | 云储新能源科技有限公司 | Online computing method, device, medium and product for impedance of battery system accessory |
-
2019
- 2019-06-28 CN CN201920990053.0U patent/CN210690776U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253127A (en) * | 2021-05-10 | 2021-08-13 | 宝能(广州)汽车研究院有限公司 | Voltage acquisition method of battery pack and electric vehicle |
| CN117169753A (en) * | 2023-11-03 | 2023-12-05 | 合肥国轩高科动力能源有限公司 | Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment |
| CN117169753B (en) * | 2023-11-03 | 2024-03-08 | 合肥国轩高科动力能源有限公司 | Method and device for determining parameters of electric connection pieces of batteries connected in series and electronic equipment |
| CN117805642A (en) * | 2024-02-29 | 2024-04-02 | 双一力(宁波)电池有限公司 | Voltage acquisition method and device for battery cell, processor and storage medium |
| CN117805642B (en) * | 2024-02-29 | 2024-05-28 | 双一力(宁波)电池有限公司 | Voltage acquisition method and device for battery cell, processor and storage medium |
| CN118444171A (en) * | 2024-07-05 | 2024-08-06 | 云储新能源科技有限公司 | Online computing method, device, medium and product for impedance of battery system accessory |
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Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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