CN112072758A - Intelligent battery equalization module - Google Patents
Intelligent battery equalization module Download PDFInfo
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- CN112072758A CN112072758A CN202011030454.5A CN202011030454A CN112072758A CN 112072758 A CN112072758 A CN 112072758A CN 202011030454 A CN202011030454 A CN 202011030454A CN 112072758 A CN112072758 A CN 112072758A
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- Prior art keywords
- battery
- battery pack
- capacity
- module
- intelligent
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/13—Maintaining the SoC within a determined range
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses an intelligent battery equalization module, which comprises a battery pack, a battery pack and a battery pack, wherein the battery pack comprises a plurality of battery packs; each battery pack is connected with an electric control switch; each battery pack is connected with a capacity detection module and used for acquiring the battery capacity of each battery pack; and the input end of the control chip is connected with the capacity detection module, and the output end of the control chip is connected with the electric control switch of each battery pack and used for controlling the switching state and the conduction sequence of each battery pack according to the input battery capacity of each battery pack. The invention can control the charging and discharging condition of each battery pack according to the battery capacity of each battery pack, thereby realizing battery balance.
Description
Technical Field
The invention relates to the field of battery equalization, in particular to an intelligent battery equalization module.
Background
The important index for measuring the performance of the battery is the battery capacity, and the battery capacity of each battery pack in the battery is relatively uniform when the battery is delivered from a factory, as shown in fig. 1, the battery capacity can reach 95% -100%, but because of the factors such as the production and manufacturing process irregularity of each battery pack, the thermal effect of the battery pack, the internal resistance irregularity and the like, the performance of each battery pack is different, so that the attenuation amplitude of the battery capacity of each battery pack is inconsistent after the battery is operated for a long time, the whole group capacity of the battery is also based on the battery pack with the lowest capacity, in this case, if a plurality of battery packs are still controlled to be simultaneously conducted and discharged, the balancing strategy of the battery is disturbed, as shown in fig. 2, in fig. 2, the interval between two horizontal lines represents the entire battery capacity of the battery, and it can be seen that the capacity of the entire battery pack is greatly reduced, and the charge-discharge efficiency cannot be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent battery balancing module which controls the charging and discharging condition of each battery pack according to the battery capacity of each battery pack to realize battery balancing.
The purpose of the invention is realized by adopting the following technical scheme:
an intelligent battery equalization module, comprising:
the battery pack comprises a plurality of battery packs; each battery pack is connected with an electric control switch;
each battery pack is connected with a capacity detection module and used for acquiring the battery capacity of each battery pack;
and the input end of the control chip is connected with the capacity detection module, and the output end of the control chip is connected with the electric control switch of each battery pack and used for controlling the switching state and the conduction sequence of each battery pack according to the input battery capacity of each battery pack.
Further, the current flowing through each of the battery packs is the same.
Further, the capacity detection module includes:
the two ends of each battery pack are connected with the voltage acquisition units and are used for acquiring voltage signals of each battery pack in the discharging process;
and the processing unit is connected with the voltage acquisition unit and used for determining a characteristic curve of voltage change along with time in the discharging process of each battery pack and calculating the battery capacity of each battery pack according to a conversion formula.
Further, the conduction sequence of the electric control switch corresponding to each battery pack is positively correlated with the battery capacity of each battery pack.
Furthermore, a capacity threshold is preset in the control chip, and when the battery capacity of the battery pack is smaller than the capacity threshold, the battery pack is controlled to be disconnected.
Furthermore, the control chip is connected with a display module for displaying battery parameters of each battery pack and the whole battery pack.
Further, the battery parameters include a switch state of each battery pack, a battery capacity of each battery pack, an output voltage and an output current of the entire battery pack, and a battery capacity of the entire battery pack.
Further, the control chip is connected with an alarm module for prompting the serial number corresponding to the battery pack with the battery capacity smaller than the capacity threshold value.
Furthermore, the control chip is connected with a manual selection module for manually controlling the on-off state and the conduction sequence of the electric control switch corresponding to each battery pack.
Further, the battery pack is also connected with a power module for charging from an external power supply.
Compared with the prior art, the invention has the beneficial effects that:
the on-off state and the conduction sequence of the electric control switch corresponding to each battery pack can be intelligently controlled according to the battery capacity condition of each battery pack, so that the discharging condition of each battery pack can be selected according to the actual condition, the overall capacity of the battery pack is improved, and the battery balance is realized.
Drawings
Fig. 1 shows the battery capacity of each battery pack when shipped from a factory in the background art of the present invention;
FIG. 2 is a diagram illustrating the capacity of a battery after the battery is attenuated according to the background art of the present invention;
FIG. 3 is a block diagram of a module of the intelligent battery equalization module of the present invention;
fig. 4 is a schematic diagram of the battery capacity after the passive equalization of the battery pack according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The embodiment provides an intelligent battery equalization module, which can be applied to the field of batteries of electric vehicles or battery modules of other electric equipment.
As shown in fig. 3, the battery equalization module of the present embodiment at least includes a battery pack, an electric control switch, a capacity detection module and a control chip; the battery pack comprises a plurality of connected battery packs, and the plurality of battery packs can output electric quantity simultaneously or partially to provide corresponding electric energy for electric equipment. Meanwhile, the battery pack is also connected with a power module used for charging from an external power supply, and when the power module is started, all battery packs or a plurality of independent battery packs in the battery pack can be powered, so that the charging effect is realized.
The plurality of battery packs may be connected in series such that the currents flowing through the plurality of battery packs are the same. In addition, in this embodiment, can number every group battery, every group battery corresponds its unique serial number, can learn the series position of group battery in the battery package through this serial number to follow-up charge-discharge situation to individual group battery controls.
Each battery pack is connected with an independent electric control switch, namely one battery pack corresponds to one electric control switch, the electric control switches can be in a conducting or disconnecting state of the battery pack, if the electric control switch of a certain battery pack is closed, the battery pack is conducted, and voltage and current can be input or output; if the electric control switch of a certain battery pack is turned on, the battery pack is not conducted, and electric energy cannot be input or output.
Each battery pack is connected with an independent capacity detection module, and the capacity detection module is used for acquiring the battery capacity of each battery pack. In this embodiment, the capacity detection module includes a voltage acquisition unit and a processing unit; the two ends of each battery pack are connected with a voltage acquisition unit, the voltage acquisition units are used for acquiring voltage signals of each battery pack in the discharging process and acquiring a discharging characteristic curve of each battery pack in a mode of acquiring the voltage signals once every set time; in the discharging process of the battery pack, the change of the terminal voltage of the battery pack is divided into three stages, and the terminal voltage is sharply reduced in the initial discharging stage; in the middle discharge period, the terminal voltage is slowly reduced, when the later discharge period is close to the final discharge period, the terminal voltage of the battery pack is rapidly reduced in a short time, and the voltage acquisition unit acquires the voltage signal of each battery pack at set time intervals, so that the quality of the battery pack can be known according to the maintenance time in the middle discharge period.
The processing unit is connected with the voltage acquisition unit, the voltage acquisition unit of each battery pack transmits acquired voltage data to the processing unit, and the processing unit analyzes the time maintained by each battery pack in the middle discharge period according to the characteristic curve of the voltage of each battery pack along with the time change in the discharge process and calculates the battery capacity of each battery pack according to a capacity conversion formula.
Taking an aluminum iron phosphate battery as an example, the discharge voltage of the battery is 2.7-3.65V, wherein the relatively balanced voltage in the middle discharge period is 3-3.4V, and the battery capacity is calculated through the discharge process; if the discharge voltage of the battery pack with the number 1 reaches 3.4V, the recording start time T11 is started, and the discharge voltage of the battery pack with the number 1 is reduced to 3V, the recording end time T12 is recorded, so that the maintaining time of the battery pack with the number 1 in the middle discharge period is T12T 11; similarly, when the discharge voltage of the battery pack numbered 2 starts to reach 3.4V, the starting time T21 is recorded, and when the discharge voltage of the battery pack numbered 2 decreases to 3V, the ending time T22 is recorded, so that the maintaining time of the battery pack numbered 2 in the middle discharge period is T22-T21; after each battery pack obtains the data, the battery packs are sorted according to the size of the maintaining time, and the battery current is the same, so that the battery capacity of the battery pack with the longest maintaining time is the largest, and conversely, the battery capacity of the battery pack with the shortest maintaining time is the smallest.
The capacity detection module is connected with the input end of the control chip and used for receiving the battery capacity parameters of each battery pack sent by the capacity detection module and generating a corresponding control instruction according to the battery capacity of each battery pack; and the output end of the control chip is connected with the electric control switch of each battery pack and is used for controlling the switching state and the conduction sequence of each battery pack according to the control instruction.
In this embodiment, the control chip may sequence each battery pack according to the battery capacity of each battery pack, and after the sequencing, the difference between the highest battery capacity and the lowest battery capacity in the battery pack may be obtained, and the opening sequence of the electronic control switch corresponding to each battery pack is controlled according to the difference; in this embodiment, the conduction sequence of the electronic control switch corresponding to each battery pack is positively correlated to the battery capacity of each battery pack, that is, the conduction and discharge sequence of the battery pack with relatively large battery capacity is relatively preferred, and the conduction and discharge sequence of the battery pack with relatively small battery capacity is relatively later, so that the continuous discharge time of the battery pack is increased, as shown in fig. 4, the overall battery capacity of the battery pack in fig. 4 is significantly increased, thereby implementing a strategy of passive equalization and improving the charge and discharge performance of the battery pack.
In addition, a preset capacity threshold value can be recorded in the control chip in advance, and when the battery capacity of a certain battery pack is judged to be smaller than the capacity threshold value, the battery capacity of the battery pack is too small to be suitable for being used continuously, so that the battery pack is recommended to be disconnected, and the influence of the battery pack on the whole battery capacity is avoided. The specific principle is that when the battery capacity of a certain battery pack is judged to be smaller than the capacity threshold value, a disconnection instruction is sent to an electric control switch corresponding to the battery pack, so that current does not flow through the battery pack any more, and the battery pack with the excessively small battery capacity is discarded on the premise of not influencing the normal charging and discharging of a battery pack.
The control chip is connected with an alarm module, the alarm module can prompt that a battery pack with the too small battery capacity exists in the battery pack in a display mode, a voice mode or a short message sending mode, and meanwhile the number corresponding to the battery pack with the battery capacity smaller than a capacity threshold value is informed, so that maintenance personnel can directly find the position of the battery pack needing to be replaced according to the number of the battery pack, and the replacement and maintenance efficiency of the battery pack is improved. In addition, when the battery capacity of more than half or more than half of the battery packs in one battery pack is smaller than the capacity threshold value, the battery pack cannot work normally, and corresponding alarm information can be sent out to inform a user of directly replacing the whole battery pack.
In addition, the control chip can judge the service life of the battery pack according to the battery capacity of each battery pack, if the number of the battery packs with the battery capacities smaller than the capacity threshold value is small, the service life of the battery pack is relatively long, and if the number of the battery packs with the battery capacities smaller than the capacity threshold value is large, the service life of the battery pack is relatively short.
The alarm or prompt information can be displayed and reminded by a display module connected with the control chip, and in addition, the battery parameters of each battery pack and the whole battery pack can also be displayed and reminded by the display module connected with the control chip, wherein the battery parameters include but are not limited to the on-off state of each battery pack, the battery capacity of each battery pack, the output voltage and the output current of the whole battery pack, the battery capacity of the whole battery pack, the service life of the battery pack and the like. In addition, control chip still can be equipped with communication module, and control chip accessible communication module connects the high in the clouds, uploads all alarm data, the battery parameter of group battery, the battery parameter of battery package that the aforesaid was gathered to the high in the clouds and preserves, lets user or maintenance personal can know every group battery and the whole condition of battery package, provides the data foundation for its maintenance.
In the display module, the battery capacity of different battery packs can be represented by different identifiers, and specifically, the battery capacities of different battery packs can be represented by different colors or different patterns, for example, a battery pack with a battery capacity smaller than a capacity threshold is marked as red, and a battery pack with a battery capacity higher than or equal to the capacity threshold is marked as green; alternatively, the battery pack having a relatively short battery life may be marked in its entirety with red, and the battery pack having a relatively long battery life may be marked in its entirety with green.
In addition, the control chip is connected with a manual selection module, the manual selection module can be an input module such as a touch interactive screen or a mouse keyboard, and a user or a maintenance person can manually control the on-off state and the conducting sequence of the electric control switch corresponding to each battery pack in the input module of the touch interactive screen or the mouse keyboard lamp, so that the flexibility of the battery balancing module is improved. When the user turns on the electric control switch corresponding to the battery pack with the battery capacity lower than the capacity threshold value, the control chip automatically generates a prompt instruction, and pops up a prompt popup window in the display module to inform the user that the selection operation is abnormal, so that the user confirms the previous selection operation again. If the user determines the selection operation through the input module, the control chip cancels the prompt and executes the corresponding operation according to the operation selected by the user.
The scope of the present invention is not limited to the exemplary embodiments shown in the drawings and described, but also includes all embodiments that can bring about the equivalent effects to the present invention. Furthermore, the scope of the present invention is not limited to the combinations of features of the present invention specified in each claim, but may be specified by any desired combinations of specific features among all the disclosed features.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. An intelligent battery equalization module, comprising:
the battery pack comprises a plurality of battery packs; each battery pack is connected with an electric control switch;
each battery pack is connected with a capacity detection module and used for acquiring the battery capacity of each battery pack;
and the input end of the control chip is connected with the capacity detection module, and the output end of the control chip is connected with the electric control switch of each battery pack and used for controlling the switching state and the conduction sequence of each battery pack according to the input battery capacity of each battery pack.
2. The intelligent battery equalization module of claim 1 wherein the current flowing through each of the battery packs is the same.
3. The intelligent battery equalization module of claim 1 wherein the capacity detection module comprises:
the two ends of each battery pack are connected with the voltage acquisition units and are used for acquiring voltage signals of each battery pack in the discharging process;
and the processing unit is connected with the voltage acquisition unit and used for determining a characteristic curve of voltage change along with time in the discharging process of each battery pack and calculating the battery capacity of each battery pack according to a conversion formula.
4. The intelligent battery equalization module of claim 1, wherein the conduction sequence of the electronically controlled switch corresponding to each battery pack is positively correlated to the battery capacity of each battery pack.
5. The intelligent battery equalization module of claim 1, wherein a capacity threshold is preset in the control chip, and when the battery capacity of the battery pack is smaller than the capacity threshold, the battery pack is controlled to be disconnected.
6. The intelligent battery equalization module of claim 1 wherein the control chip is connected to a display module for displaying battery parameters of each battery pack and the entire battery pack.
7. The intelligent battery equalization module of claim 6 wherein the battery parameters include a switch state of each battery pack, a battery capacity of each battery pack, an output voltage and an output current of the entire battery pack, and a battery capacity of the entire battery pack.
8. The intelligent battery equalization module of claim 5, wherein the control chip is connected to an alarm module for prompting a serial number corresponding to the battery pack having a battery capacity less than the capacity threshold.
9. The intelligent battery equalization module of claim 1, wherein the control chip is connected to a manual selection module for manually controlling the on-off state and the conduction sequence of the electric control switch corresponding to each battery pack.
10. The intelligent battery equalization module of claim 1 wherein the battery pack is further coupled to a power module for charging from an external power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011030454.5A CN112072758A (en) | 2020-09-27 | 2020-09-27 | Intelligent battery equalization module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011030454.5A CN112072758A (en) | 2020-09-27 | 2020-09-27 | Intelligent battery equalization module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895304A (en) * | 2021-11-10 | 2022-01-07 | 江西五十铃汽车有限公司 | Battery capacity detection device for electric automobile |
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2020
- 2020-09-27 CN CN202011030454.5A patent/CN112072758A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113895304A (en) * | 2021-11-10 | 2022-01-07 | 江西五十铃汽车有限公司 | Battery capacity detection device for electric automobile |
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