CN114123397B - A power battery pack control method and a power battery pack - Google Patents
A power battery pack control method and a power battery pack Download PDFInfo
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- CN114123397B CN114123397B CN202111369005.8A CN202111369005A CN114123397B CN 114123397 B CN114123397 B CN 114123397B CN 202111369005 A CN202111369005 A CN 202111369005A CN 114123397 B CN114123397 B CN 114123397B
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
本发明提供了一种动力电池包控制方法及动力电池包，该动力电池包控制方法包括步骤：获取并联的第一电池包和第二电池包的供电能力，其中，所述供电能力包括剩余容量和带载电压；根据所述供电能力，确定所述第一电池包和所述第二电池包中的主放电包和辅放电包，其中，所述主放电包适于对负载单独进行供电，或与所述辅放电包共同对所述负载进行供电；当所述辅放电包对所述负载共同进行供电时，控制所述辅放电包的放电电流由低放电电流增加至高放电电流。本发明的有益效果：能够提高电池包的放电效率。
The present invention provides a power battery pack control method and a power battery pack, the power battery pack control method comprises the following steps: obtaining the power supply capacity of a first battery pack and a second battery pack connected in parallel, wherein the power supply capacity comprises the remaining capacity and the load voltage; determining the main discharge pack and the auxiliary discharge pack in the first battery pack and the second battery pack according to the power supply capacity, wherein the main discharge pack is suitable for supplying power to a load alone, or supplying power to the load together with the auxiliary discharge pack; when the auxiliary discharge pack supplies power to the load together, controlling the discharge current of the auxiliary discharge pack to increase from a low discharge current to a high discharge current. The beneficial effects of the present invention: the discharge efficiency of the battery pack can be improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a power battery pack control method and a power battery pack.
Background
In the application scene of the power battery pack, for example, when power is supplied to loads such as a power tool, most of battery cells in the battery pack are in a high discharge rate use environment, because the battery cells in the battery pack have the strongest carrying capacity on a rated voltage platform and above, when the battery cells are discharged to a certain voltage point below the rated voltage, the battery cells are easily pulled down to a battery pack under-voltage protection state by discharging of heavy load current, at the moment, the power tool can stop working, a great part of electric quantity in the battery cells cannot be released, and finally the total discharge efficiency of the battery pack is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of how to improve the discharging efficiency of a battery pack.
In order to achieve the above object, the present invention provides a control method of a power battery pack, comprising the steps of:
Acquiring power supply capacity of a first battery pack and a second battery pack which are connected in parallel, wherein the power supply capacity comprises residual capacity and load voltage;
determining a main discharge pack and an auxiliary discharge pack in the first battery pack and the second battery pack according to the power supply capacity, wherein the main discharge pack is suitable for independently supplying power to a load or supplying power to the load together with the auxiliary discharge pack;
And when the auxiliary discharge bag supplies power to the load, controlling the discharge current of the auxiliary discharge bag to be increased from low discharge current to high discharge current.
According to the control method of the power battery pack, the power supply capacity of the first battery pack and the second battery pack which are connected in parallel is obtained, namely, the residual capacity and the load voltage of the two battery packs are obtained, so that the power supply capacity of the two battery packs to a load can be estimated accurately, the main discharging pack and the auxiliary discharging pack in the first battery pack and the second battery pack are confirmed, the main discharging pack and the auxiliary discharging pack can be used for supplying power to the load independently or simultaneously, the main discharging pack and the auxiliary discharging pack can be used for supplying power to the load, a good power supply effect is ensured, due to the fact that the battery packs are connected in parallel, the capacity of a battery pack group is increased remarkably, the output current capacity of the battery pack group is improved correspondingly, the current demand of the single battery pack is reduced, the discharging multiplying power of the corresponding single battery pack is reduced, the descending speed of the voltage is reduced, the working period of entering an under-voltage protection point is prolonged, the capacity utilization efficiency of a battery core can be improved, the discharging current of the auxiliary discharging pack is controlled to be increased by a high discharging current to supply the load, the auxiliary discharging pack can be released from the low discharging current, the capacity of the battery pack can be fully released, the main discharging efficiency can be improved, the discharging efficiency of the auxiliary battery pack can be improved, the service life of the battery pack can be prolonged, and the service life of the device can be improved, and the device can be prolonged, can be better and life and can protection equipment can be used and can be used.
Further, the determining the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet according to the power supply capability includes:
when the residual capacity of the first battery pack is larger than the sum of the residual capacity of the second battery pack and the preset error capacity, determining that the first battery pack is the main discharge pack, and determining that the second battery pack is the auxiliary discharge pack;
And when the residual capacity of the first battery pack is smaller than the difference between the residual capacity of the second battery pack and the preset error capacity, determining that the second battery pack is the main discharge pack, and determining that the first battery pack is the auxiliary discharge pack.
Further, the determining the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet according to the power supply capability further includes:
And when the difference value between the residual capacity of the first battery pack and the residual capacity of the second battery pack is in a first preset error range, determining a main discharge pack and an auxiliary discharge pack in the first battery pack and the second battery pack according to the load voltages of the first battery pack and the second battery pack.
Further, the determining the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet according to the load voltages of the first battery packet and the second battery packet includes:
when the load voltage of the first battery pack is greater than or equal to the load voltage of the second battery pack, determining that the first battery pack is the main discharge pack, and determining that the second battery pack is the auxiliary discharge pack;
And when the load voltage of the first battery pack is smaller than that of the second battery pack, determining that the second battery pack is the main discharge pack, and determining that the first battery pack is the auxiliary discharge pack.
Further, the maximum boundary value of the first preset error range is the sum of the product of the maximum capacity of the first battery pack and a preset percentage and the preset error capacity.
Further, the power battery pack control method further includes:
When the residual capacity of the main discharge packet is larger than the sum of the residual capacity of the auxiliary discharge packet and the preset capacity, the main discharge packet is controlled to independently supply power to the load;
When the difference value between the residual capacity of the main discharge packet and the residual capacity of the auxiliary discharge packet is in a second preset error range, controlling the main discharge packet and the auxiliary discharge packet to supply power to the load at the same time;
And stopping the power supply of the main discharge packet and the auxiliary discharge packet to the load when the residual capacity of the main discharge packet is smaller than the difference between the residual capacity of the auxiliary discharge packet and the preset capacity, and carrying out the determination of the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet again.
Further, the controlling the discharge current of the auxiliary discharge vessel to increase from a low discharge current to a high discharge current comprises:
controlling the discharge current to linearly increase from the low discharge current until the high discharge current is reached, or
And controlling the discharge current to linearly increase from the low discharge current to the medium discharge current, and linearly increasing to the high discharge current when the duration of the medium discharge current reaches a preset time.
Further, the current value of the high discharge current is less than or equal to 50% of the maximum current value of the auxiliary discharge bulb.
The invention also provides a power battery pack, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the power battery pack control method is realized when the processor executes the computer program.
Further, the power battery pack further comprises a first battery pack, a second battery pack, parallel battery electrodes, a first NMOS component and a second NMOS component, wherein the first NMOS component is arranged between the first battery pack and the parallel battery electrodes, and the second NMOS component is arranged between the second battery pack and the parallel battery electrodes.
The power battery pack has similar technical effects to those of the power battery pack control method, and detailed description is omitted herein.
Drawings
Fig. 1 is a schematic flow chart of a power battery pack control method according to an embodiment of the invention;
Fig. 2 is a block diagram of a power battery pack according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It is noted that the terms "first," "second," and the like in the description and claims of the invention and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or illustrated embodiment of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.
Referring to fig. 1, an embodiment of the present invention provides a power battery pack control method, including the steps of:
S1, acquiring power supply capacity of a first battery pack and a second battery pack which are connected in parallel, wherein the power supply capacity comprises residual capacity and load voltage;
s2, determining a main discharging bag and an auxiliary discharging bag in the first battery bag and the second battery bag according to the power supply capacity, wherein the main discharging bag is suitable for independently supplying power to a load or supplying power to the load together with the auxiliary discharging bag;
And S3, when the auxiliary discharge packet supplies power to the load, controlling the discharge current of the auxiliary discharge packet to be increased from low discharge current to high discharge current.
The power battery pack control method in the embodiment of the invention can be particularly used for controlling a power battery pack with at least two battery packs, for example, a power battery pack with a principle shown in fig. 2, wherein the power battery pack is provided with two first battery packs and second battery packs which are connected in parallel, and the two battery packs can be connected into a load at the same time so as to supply power at the same time or alternatively connected into the load for separate power supply.
When the power battery pack is used, after a certain number of cyclic discharging operations are performed, the voltage of the battery pack cannot truly reflect the power supply capability of the battery pack due to self aging, so in this embodiment, by acquiring the power supply capability of the first battery pack and the second battery pack which are connected in parallel, that is, specifically acquiring the residual capacity (effective residual capacity) of the two battery packs and acquiring the load voltage of the two battery packs, the load voltage is a preset voltage under a certain fixed load condition, therefore, the power supply capability is confirmed by the residual capacity and the load voltage, so that the power supply capability of the two battery packs can be more accurately determined, and then the main discharging pack and the auxiliary discharging pack in the first battery pack and the second battery pack can be confirmed, based on the two battery packs which are subjected to main and auxiliary confirmation and setting, the main discharging pack can supply power to the load independently, or the main discharging pack and the auxiliary discharging pack can supply power to the load simultaneously, so that a better effect can be ensured, the main discharging pack has better power supply capability, the main discharging pack can realize the independent power supply capability, the main discharging pack and the auxiliary discharging pack can be ensured to realize the respective power supply capability of the batteries, the batteries can be reduced in parallel, the current of the respective power supply capacity of the batteries can be reduced, the current of the parallel packs can be increased, and the power supply capability of the batteries can be increased, and the current of the respective current of the parallel packs can be increased, and the power supply capability of the current of the batteries can be increased.
It can be understood that, because the power supply capability of the battery pack is a changing process, better independent power supply or simultaneous power supply switching can be realized according to the change of the power supply capability, and the primary and secondary identification of the first battery pack and the second battery pack can also be a dynamic and re-identification process according to the power supply capability, namely, when the power supply capability of the primary discharge pack is excessively reduced to be lower than that of the secondary discharge pack, the re-identification can be performed, and the setting is performed to reasonably supply power, so that the utilization efficiency of the battery pack is improved as much as possible.
When the auxiliary discharging bag supplies power to the load, the discharging current of the auxiliary discharging bag is controlled to be increased from low discharging current to high discharging current, so that the capacity of the battery bag can be fully released, the discharging efficiency of the main discharging bag and the auxiliary discharging bag can be improved as much as possible, the releasing process is more reasonable, the power supply stability is improved, the equipment can be well protected, and the service life of the battery bag is prolonged.
In an alternative embodiment of the present invention, the determining the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet according to the power supply capability includes:
when the residual capacity of the first battery pack is larger than the sum of the residual capacity of the second battery pack and the preset error capacity, determining that the first battery pack is the main discharge pack, and determining that the second battery pack is the auxiliary discharge pack;
And when the residual capacity of the first battery pack is smaller than the difference between the residual capacity of the second battery pack and the preset error capacity, determining that the second battery pack is the main discharge pack, and determining that the first battery pack is the auxiliary discharge pack.
In this embodiment, when determining the main discharge pack and the auxiliary discharge pack in the first battery pack and the second battery pack according to the residual capacity, the determination is specifically performed by the residual capacity conditions of the two battery packs, and a preset error capacity is set for combination to perform judgment, where the preset error capacity is used to reflect the difference between the residual capacities of the two battery packs, so as to facilitate the power supply control of main power supply and auxiliary power supply, avoid the generation of misjudgment, and further facilitate the power supply control of the main discharge pack and the auxiliary discharge pack.
Specifically, when the difference between the remaining capacity of the battery pack with larger remaining capacity and the remaining capacity of the other battery pack with smaller remaining capacity is larger than the sum of the preset error capacities, the battery pack with larger remaining capacity is judged to be the main discharge pack, and the battery pack with smaller remaining capacity is judged to be the auxiliary discharge pack. And in other cases, other modes can be adopted to combine to judge the main and auxiliary discharge bags, for example, one of the two battery bags with similar power supply capacity is set as the main discharge bag by default.
In an optional embodiment of the present invention, the determining the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet according to the power supply capability further includes:
And when the difference value between the residual capacity of the first battery pack and the residual capacity of the second battery pack is in a first preset error range, determining a main discharge pack and an auxiliary discharge pack in the first battery pack and the second battery pack according to the load voltages of the first battery pack and the second battery pack.
In this embodiment, specifically, when the difference between the remaining capacity of the first battery pack and the remaining capacity of the second battery pack is in the first preset error range, it indicates that the remaining capacity of the first battery pack and the remaining capacity of the second battery pack do not have a large difference, where the maximum boundary value of the first preset error range is the sum of the product of the maximum capacity of the first battery pack and the preset percentage and the preset error capacity. In this embodiment, the preset percentage may be 3%, so that when the difference between the remaining capacity of the first battery pack and the remaining capacity±error capacity of the second battery pack is smaller than 3% of the maximum capacity, the main and auxiliary discharging packs are confirmed by combining the on-load voltage, so that the main and auxiliary conditions in the two battery packs can be more reasonably confirmed by combining the remaining capacity and the on-load voltage.
When the load voltage of the first battery pack is greater than or equal to the load voltage of the second battery pack, determining that the first battery pack is the main discharge pack, and determining that the second battery pack is the auxiliary discharge pack; when the load voltage of the first battery pack is smaller than that of the second battery pack, the second battery pack is determined to be the main discharge pack, the first battery pack is determined to be the auxiliary discharge pack, and accordingly, battery packs with relatively large load voltages in the two battery packs are determined to be the main discharge packs, otherwise, the battery packs are the auxiliary discharge packs, and accordingly, the discharge efficiency of the two battery packs is improved as much as possible.
In an alternative embodiment of the present invention, the power battery pack control method further includes:
When the residual capacity of the main discharge packet is larger than the sum of the residual capacity of the auxiliary discharge packet and the preset capacity, the main discharge packet is controlled to independently supply power to the load;
When the difference value between the residual capacity of the main discharge packet and the residual capacity of the auxiliary discharge packet is in a second preset error range, controlling the main discharge packet and the auxiliary discharge packet to supply power to the load at the same time;
And stopping the power supply of the main discharge packet and the auxiliary discharge packet to the load when the residual capacity of the main discharge packet is smaller than the difference between the residual capacity of the auxiliary discharge packet and the preset capacity, and carrying out the determination of the main discharge packet and the auxiliary discharge packet in the first battery packet and the second battery packet again.
In this embodiment, when the power battery pack supplies power, the main discharge pack may supply power to the load first, during the power supply process, the residual capacity of the main discharge pack gradually decreases, if the residual capacity is continuously greater than the sum of the residual capacity of the auxiliary discharge pack and the preset capacity, the main discharge pack always supplies power to the load, and when the residual capacity of the main discharge pack continuously decreases and the difference value between the residual capacity of the main discharge pack and the residual capacity of the auxiliary discharge pack is in the second preset error range, that is, the residual capacity aberration of the main discharge pack and the residual capacity of the auxiliary discharge pack is smaller, at this time, the main discharge pack and the auxiliary discharge pack are controlled to supply power simultaneously so as to achieve better power supply efficiency, and when the residual capacity of the main discharge pack is less than the difference between the residual capacity of the auxiliary discharge pack and the preset capacity, at this time, that indicates that the main power supply function cannot be formed independently, at this time, that is, the power supply to the load is disconnected, and according to the control method in the above embodiment, the determination of the main discharge pack and the auxiliary discharge pack is performed again, so as to achieve more reasonable control, and the service life of the battery pack can be reasonably improved.
In an alternative embodiment of the present invention, the controlling the discharge current of the auxiliary discharge vessel to increase from a low discharge current to a high discharge current includes:
controlling the discharge current to linearly increase from the low discharge current until the high discharge current is reached, or
And controlling the discharge current to linearly increase from the low discharge current to the medium discharge current, and linearly increasing to the high discharge current when the duration of the medium discharge current reaches a preset time.
In this embodiment, when the auxiliary discharging bag supplies power, the auxiliary discharging bag adopts a power supply mode of gradually or stepwise increasing current to reach the power supply requirement, so as to realize reasonable power supply access, fully release the capacity of the battery bag, improve the discharging efficiency of the main discharging bag and the auxiliary discharging bag, and ensure the service life of the battery bag. Specifically, when the current is increased, the discharge current of the auxiliary discharge package can be increased in a linear increment mode, or when the discharge current is in a low discharge current, the middle discharge current is increased in a linear increment mode, the middle discharge current is maintained for a preset period of time, and then the linear increment is performed until the required high discharge current is reached, wherein the current value of the high discharge current is less than or equal to 50% of the maximum current value of the auxiliary discharge package, so that auxiliary power supply is performed when the main discharge package and the auxiliary discharge package are simultaneously powered, the whole discharge process is reasonably arranged, the capacity is fully released, and the battery package can be protected.
The preset time can be determined according to the capacity of the current main discharge package, for example, the preset time is generated according to the capacity and the current power supply condition, so that the preset time can be reasonably combined with the discharge process of the main discharge package, the discharge efficiency is improved as much as possible, and the two battery packages are protected as much as possible.
In another embodiment of the present invention, a power battery pack includes a memory, a processor, and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the power battery pack control method as described above.
The power battery pack in this embodiment has similar technical effects to those of the above power battery pack control method, and will not be described herein.
Referring to fig. 2, the power battery pack in the present invention further includes a first battery pack, a second battery pack, a parallel battery electrode, a first NMOS device and a second NMOS device, wherein the first NMOS device is disposed between the first battery pack and the parallel battery electrode, and the second NMOS device is disposed between the second battery pack and the parallel battery electrode.
In this embodiment, the parallel battery electrode includes a parallel battery positive electrode and a parallel battery negative electrode, the first NMOS device is disposed between the first battery pack positive electrode and the parallel battery positive electrode, the second NMOS device may be disposed between the second battery pack positive electrode and the parallel battery positive electrode, and the first NMOS device and the second NMOS device may be connected to the first MOS drive and the second MOS drive respectively, and are in communication connection with the master control MCU (processor), and the parallel battery negative electrode is connected to the first battery pack negative electrode and the second battery pack negative electrode, and both are provided with resistors therebetween, so as to realize power supply control of the first battery pack and the second battery pack. The first battery pack communication port and the second battery pack communication port are connected with the main control MCU, so as to be used for feeding back battery pack information, such as the load voltage and the residual capacity information.
The first NMOS element and the second NMOS element may each comprise a plurality of NMOS tubes connected in series.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (8)
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| CN114123397A (en) | 2022-03-01 |
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