CN103166257A - Battery pack voltage equalizing system and equalizing method - Google Patents
Battery pack voltage equalizing system and equalizing method Download PDFInfo
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- CN103166257A CN103166257A CN2011104166286A CN201110416628A CN103166257A CN 103166257 A CN103166257 A CN 103166257A CN 2011104166286 A CN2011104166286 A CN 2011104166286A CN 201110416628 A CN201110416628 A CN 201110416628A CN 103166257 A CN103166257 A CN 103166257A
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Abstract
The invention discloses a battery pack voltage equalizing system which comprises a sampling module, an equalizing module and a control module. The control module confirms a single battery which needs to be equalized according to battery information of a battery pack collected by the sampling module and controls the equalizing module to equalize the single battery which needs to be equalized. When the sampling module collects the battery information of the battery pack, the equalizing module is controlled to close equalizing current. The technical problems that deviation of voltage collected by the sampling module is shown, the deviation is caused by existence of the equalizing current, and using performance of the battery pack is influenced are solved. Accuracy of the voltage collected by the sampling module is guaranteed, and the using performance of the battery pack is improved.
Description
Technical field
The invention belongs to battery charging field, be specifically related to a kind of battery voltage equalizing system and equalization methods.
Background technology
Electrokinetic cell because of its preferably utilance be widely used in each electronic product, especially electric motor car.Because battery pack is to be connected in series by a plurality of cells to form, therefore may there be voltage differences between each joint cell, and along with after charge and discharge cycles repeatedly, the voltage differences between cell is increasing, thereby has affected the serviceability of battery pack.In order to solve the technical problem of cell difference; generally increased balance module; make the monomer battery voltage of battery pack reach balanced by balance module; although but the method has solved the monomer battery voltage difference problem; but the existence because of euqalizing current has caused the voltage of sampling module sampling deviation to occur, and this voltage deviation can cause protection in advance or the delay protection of battery pack.If battery pack is protected in advance, cause the residual capacity of battery pack to be not used, make the service efficiency of battery pack descend, economic benefit reduces; If battery pack delay protection; cause overcharging or overdischarge of respective battery; overcharge and cross the situation of putting decayed the useful life of respective battery, also just affected the service life cycle of whole battery pack accordingly, make the economic benefit of battery pack in whole life cycle reduce.
Prior art affects the technical problem of sampling module sampled voltage in order to solve euqalizing current, balance module and sampling module are set up respectively passage, and namely balance module and sampling module carry out respectively electric voltage equalization and the sampling of battery pack by passage separately.Although this scheme has played certain effect, but cost and the space of system have not only been increased, and, because the conductor resistance of the public part of the inevitable sampling channel that exists on the internal resistance of battery pack, cell both positive and negative polarity conductor introduction and equalization channel produces pressure drop, namely also affected the sampled voltage of sampling module.
Summary of the invention
The present invention is for solving in existing battery voltage equalizing system, and the technical problem of deviation appears in the voltage that affects the sampling module collection due to the existence of euqalizing current, and a kind of battery voltage equalizing system and equalization methods are provided.
Technical scheme of the present invention is:
A kind of battery voltage equalizing system, comprise sampling module, balance module and control module, described control module need to determine balanced cell according to the battery information of the battery pack that sampling module gathers, and control balance module the cell of need equilibrium is carried out equilibrium, wherein,, control balance module and close euqalizing current when gathering the battery information of battery pack when sampling module.
A kind of equalization methods of battery voltage equalizing system comprises the following steps:
Step S1: sampling module gathers the battery information of battery pack;
Step S2: the battery information that control module gathers according to sampling module need to determine balanced cell;
Step S3: control module control balance module carries out equilibrium treatment to the cell of need equilibrium, and regularly carries out next step;
Step S4: control module is controlled balance module and is closed euqalizing current, controls simultaneously sampling module the cell that carries out equilibrium treatment is sampled, and redefine according to the battery information of sampling module collection the cell that needs equilibrium, returns to execution in step S3.
advantage of the present invention: battery voltage equalizing system of the present invention, comprise sampling module, balance module and control module, described control module need to determine balanced cell according to the battery information of the battery pack that sampling module gathers, and control balance module the cell of need equilibrium is carried out equilibrium, wherein, when sampling module when gathering the battery information of battery pack, control balance module and close euqalizing current, like this, avoided causing the voltage of sampling module collection deviation to occur due to the existence of euqalizing current, and then affect the technical problem of battery pack serviceability, therefore battery voltage equalizing system of the present invention has guaranteed that sampling module gathers the accuracy of voltage, and then improved the serviceability of battery pack.
Description of drawings
The structured flowchart of the embodiment that Fig. 1 provides for battery voltage equalizing system of the present invention.
The flow chart of the embodiment that Fig. 2 provides for the equalization methods of battery voltage equalizing system of the present invention.
The flow chart of the preferred embodiment that Fig. 3 provides for the equalization methods of battery voltage equalizing system of the present invention.
Fig. 4 is the battery charging and discharging curve.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
By background technology as can be known, passage is individually realized respectively the voltage sample of battery pack and the cell of need equilibrium is carried out equilibrium even if sampling module and balance module are sampled respectively, but because the conductor resistance of the public part of the inevitable sampling channel that exists on the internal resistance of battery pack, cell both positive and negative polarity conductor introduction and equalization channel produces pressure drop, namely also affected the sampled voltage of sampling module.applicant of the present invention creatively works based on oneself, a kind of battery voltage equalizing system and corresponding equalization methods thereof have been proposed, this battery voltage equalizing system and corresponding equalization methods thereof are based on a total inventive concept, namely when sampling module when gathering the battery information of battery pack, control balance module and close euqalizing current, avoided like this causing the voltage of sampling module collection deviation to occur due to the existence of euqalizing current, and then affect the technical problem of battery pack serviceability, therefore battery voltage equalizing system of the present invention and corresponding equalization methods thereof have improved the serviceability of battery pack.
Below by specific embodiment and by reference to the accompanying drawings battery voltage equalizing system of the present invention and corresponding equalization methods thereof are described in detail respectively.
As shown in Figure 1, the battery voltage equalizing system comprises sampling module 2, balance module 3 and control module 4, described control module 4 need to determine balanced cell according to the battery information of the battery pack 1 that sampling module 2 gathers, and control 3 pairs of balance modules and need carry out equilibrium by balanced cell, wherein,, control balance module 3 and close euqalizing current when gathering the battery information of battery pack 1 when sampling module 2.In this embodiment, described sampling module 2 is connected with battery pack 1 by the same passage with balance module 3, its objective is, make whole system simple in structure, cost is low.Certainly, in concrete enforcement, described sampling module 2 can also be connected with battery pack 1 by independent passage respectively with balance module 3.Above battery information can comprise the information of voltage of each joint cell in battery pack, and certainly, described battery information can also comprise the temperature information of each joint cell in battery pack etc.
Be understandable that, the sampling module 2 of the present embodiment and balance module 3, it can adopt any module with above function in prior art, because its specific implementation is easily to realize to those skilled in the art, therefore is not described in detail at this.
Preferably, battery pack 1 electric voltage equalization system also comprises the filtration module that is connected between balance module 3 and battery pack 1, and this filtration module is used for the rush of current that rush of current that balance module 3 was caused in the moment of euqalizing current opening and closing and external interference cause and filters.In concrete enforcement, described filtration module can be filter capacitor, certainly, the filtration module of this enforcement is not limited to filter capacitor, can also realize for other circuit, device or chip, because its specific implementation is easily to realize to those skilled in the art, therefore not be described in detail at this.
Preferably; the battery voltage equalizing system also comprises the protection module that is connected between filtration module and battery pack 1; described protection module is used for the abnormal conditions (such as overvoltage or overcurrent etc.) that system occurs are protected; for example; described protection module can be fuse; namely work as and above-mentioned abnormal conditions thing occurs, thereby blown fuse has realized the cutting function of system, has namely protected system hardware equipment.Certainly, the protection module of this enforcement is not limited to filter capacitor, can also realize for other circuit, device or chip, because its specific implementation is easily to realize to those skilled in the art, therefore is not described in detail at this.
As shown in Figure 2, the equalization methods of battery voltage equalizing system comprises the following steps:
Step S1: sampling module 2 gathers the battery information of battery pack 1, and described battery information comprises voltage, temperature etc.;
Step S2: the battery information that control module 4 gathers according to sampling module 2 need to determine balanced cell;
Step S3: control module 4 is controlled 3 pairs of balance modules needs balanced cell to carry out equilibrium treatment, and next step is carried out in timing, be understandable that, described equilibrium treatment refers to the cell of need equilibrium is carried out charge or discharge, and its concrete charge or discharge are determined according to the battery information that sampling module 2 gathers by control module 4; In addition, the timing of mentioning in this step, but its concrete timing A designer person according to different battery numbers, different sampling module 2, different battery variety, different charge-discharge magnification (different charging or discharging current) and battery whether in platform area and synthetic setting.For example, timing can be according to following principle design, when battery is in platform area, timing can be longer, (this platform area refers on the battery charging and discharging curve voltage temporal evolution one section interval more slowly and battery is in platform area, for example, as shown in Figure 4) outside the time, timing can be shorter; The electric current that discharges and recharges hour, timing can be longer, when the electric current that discharges and recharges was larger, timing can be comparatively.
Step S4: control module 4 is controlled balance module 3 and is closed euqalizing current, controlling simultaneously 2 pairs of cells that carry out equilibrium treatment of sampling module samples, and redefine according to the battery information of sampling module 2 collections the cell that needs equilibrium, return to execution in step S3.
By background technology as can be known, the existence of euqalizing current has affected the voltage sample of 2 pairs of battery pack 1 of sampling module, therefore, in this step, control module 4 is controlled balance modules 3 and is closed euqalizing current and refer to, 4 of control modules need to control balance module 3 and close euqalizing current, and other parts of balance module 3 (for example gating unit) still can allow the work of not closing, and certainly, it is also passable that other parts of balance module 3 are closed work.
The flow chart of the preferred embodiment that Fig. 3 provides for the equalization methods of battery voltage equalizing system of the present invention, as shown in Figure 3, the battery voltage equalization methods comprises the following steps:
Step 31: sampling module 2 gathers the battery information of battery pack 1;
Step 32: the battery information that control module 4 gathers according to sampling module 2 need to determine balanced cell;
Step 33: control module 4 is controlled 3 pairs of balance modules needs balanced cell to carry out equilibrium treatment, and regularly carries out next step;
Step 34: control module 4 is controlled balance module 3 and is closed euqalizing current, controlling simultaneously 2 pairs of cells that carry out equilibrium treatment of sampling module samples, and the battery information that gathers according to sampling module 2 has determined whether that the cell needs carry out equilibrium, when there being cell need to carry out equilibrium, return to execution in step 33, otherwise return to execution in step 31, carry out the battery voltage equalization methods (certainly with circulation, also can carry out herein and stop battery voltage equalizing system job step, not shown in Fig. 3).
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. battery voltage equalizing system, comprise sampling module, balance module and control module, described control module need to determine balanced cell according to the battery information of the battery pack that sampling module gathers, and control balance module the cell of need equilibrium is carried out equilibrium, it is characterized in that,, control balance module and close euqalizing current when gathering the battery information of battery pack when sampling module.
2. battery voltage equalizing system according to claim 1, is characterized in that, described sampling module is connected with battery pack by the same passage with balance module.
3. battery voltage equalizing system according to claim 1, is characterized in that, described battery information comprises the information of voltage of each joint cell in battery pack.
4. battery voltage equalizing system according to claim 3, is characterized in that, described battery information also comprises the temperature information of each joint cell in battery pack.
5. battery voltage equalizing system according to claim 1, it is characterized in that, this system also comprises the filtration module that is connected between balance module and battery pack, and this filtration module is used for the rush of current that rush of current that balance module was caused in the moment of euqalizing current opening and closing and external interference cause and filters.
6. battery voltage equalizing system according to claim 5, is characterized in that, described filtration module is filter capacitor.
7. according to claim 5 or 6 described battery voltage equalizing systems, is characterized in that, this system also comprises the protection module that is connected between filtration module and battery pack, and described protection module is used for the abnormal conditions that system occurs are protected.
8. battery voltage equalizing system according to claim 7, is characterized in that, described protection module is fuse.
9. the equalization methods of a battery voltage equalizing system, the battery voltage equalizing system is battery voltage equalizing system claimed in claim 1, wherein, equalization methods comprises the following steps:
Step S1: sampling module gathers the battery information of battery pack;
Step S2: the battery information that control module gathers according to sampling module need to determine balanced cell;
Step S3: control module control balance module carries out equilibrium treatment to the cell of need equilibrium, and regularly carries out next step;
Step S4: control module is controlled balance module and is closed euqalizing current, controls simultaneously sampling module the cell that carries out equilibrium treatment is sampled, and redefine according to the battery information of sampling module collection the cell that needs equilibrium, returns to execution in step S3.
10. the equalization methods of battery voltage equalizing system according to claim 9, it is characterized in that, in step S4, when control module determined that according to the battery information of sampling module collection in battery pack, all cells all reach equilibrium state, the battery voltage equalizing system quit work or returns to execution in step S1.
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| CN2011104166286A CN103166257A (en) | 2011-12-14 | 2011-12-14 | Battery pack voltage equalizing system and equalizing method |
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| CN2011104166286A CN103166257A (en) | 2011-12-14 | 2011-12-14 | Battery pack voltage equalizing system and equalizing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019042401A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042356A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN109435759A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery information collector, battery equalization system, vehicle, method and storage medium |
| CN109435770A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015173A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method and storage medium |
| US11292360B2 (en) | 2017-08-31 | 2022-04-05 | Byd Company Limited | Battery equalization method and system, vehicle, storage medium, and electronic device |
| US11571981B2 (en) | 2017-08-31 | 2023-02-07 | Byd Company Limited | Battery equalization system, vehicle, battery equalization method and storage medium |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019042401A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042356A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| CN109435759A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery information collector, battery equalization system, vehicle, method and storage medium |
| CN109435770A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110015173A (en) * | 2017-08-31 | 2019-07-16 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method and storage medium |
| US11292360B2 (en) | 2017-08-31 | 2022-04-05 | Byd Company Limited | Battery equalization method and system, vehicle, storage medium, and electronic device |
| US11571981B2 (en) | 2017-08-31 | 2023-02-07 | Byd Company Limited | Battery equalization system, vehicle, battery equalization method and storage medium |
| CN110015173B (en) * | 2017-08-31 | 2024-01-30 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method, and storage medium |
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Application publication date: 20130619 |