CN114889491A - Hybrid battery control method, hybrid battery control device, storage medium, and electronic device - Google Patents
Hybrid battery control method, hybrid battery control device, storage medium, and electronic device Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 32
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- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 3
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 3
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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]
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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
- B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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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
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Abstract
The invention discloses a control method and device of a hybrid battery, a storage medium and an electronic device. Wherein the hybrid battery comprises a plurality of types of batteries, the method comprising: obtaining an attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery; and determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery. The invention solves the technical problem of low estimation accuracy of the state of charge of the hybrid battery.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for controlling a hybrid battery, a storage medium, and an electronic apparatus.
Background
In the development of electric automobiles, batteries become a key part in automobiles. The cost of the battery accounts for a higher proportion of the whole vehicle, the safety of the battery becomes a focus problem of social attention, how to maximize the performance of the battery on the basis of controlling the cost and ensure the safety of users becomes a problem to be solved urgently. The development of the hybrid battery not only controls the cost of the battery pack, but also improves the safety of the battery.
At present, two types of ternary lithium batteries and lithium iron phosphate batteries are mainly used in electric automobiles, and the lithium iron phosphate batteries have the characteristics of poor low-temperature characteristic, high safety, high difficulty in estimating State of Charge (SOC) and low cost; the ternary lithium battery has the characteristics of good low-temperature characteristic, low safety, accurate estimation on the SOC and high cost. In the related art, the soc of the hybrid battery is estimated by using the soc of the ternary lithium battery as a reference, however, this method cannot accurately estimate the soc and the capacity degradation of the hybrid battery, nor estimate the soc and the capacity degradation of a single battery in the hybrid battery.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a control method and device of a hybrid battery, a storage medium and an electronic device, and at least solves the technical problem that the estimation accuracy of the state of charge of the hybrid battery is low.
According to an aspect of an embodiment of the present invention, there is provided a control method of a hybrid battery including a plurality of types of batteries, the method including: obtaining an attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery; and determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
Optionally, the hybrid battery includes a first battery, and the obtaining a first attenuation coefficient corresponding to the first battery includes: acquiring a second attenuation coefficient and a first preset charge value of the first battery, wherein the second attenuation coefficient is the capacity attenuation coefficient of the first battery, and the first preset charge value is the upper limit of the capacity of the hybrid battery; and determining a first attenuation coefficient according to the second attenuation coefficient and the first preset charge value.
Optionally, the hybrid battery includes a second battery, and the obtaining the second attenuation coefficient of the first battery includes: acquiring a plurality of first sampling charge values, wherein the first sampling charge values are the upper capacity limit of the second battery in a full charge state; and determining a second attenuation coefficient according to the first preset charge value and the average value of the plurality of first sampling charge values.
Optionally, the hybrid battery includes a second battery, and acquiring a third attenuation coefficient corresponding to the second battery includes: acquiring a fourth attenuation coefficient and a second preset charge value of the second battery, wherein the fourth attenuation coefficient is the capacity attenuation coefficient of the second battery, and the second preset charge value is the lower limit of the capacity of the hybrid battery; and determining a third attenuation coefficient according to the fourth attenuation coefficient and the second preset charge value.
Optionally, the hybrid battery includes a first battery, and the obtaining a fourth attenuation coefficient of the second battery includes: acquiring a plurality of second sampling charge values, wherein the second sampling charge values are the lower limit of the capacity of the first battery in the emptying state; and determining a fourth attenuation coefficient according to the second preset charge value and the average value of the plurality of second sampling charge values.
Optionally, the hybrid battery comprises a first battery and a second battery, the method further comprising: acquiring a charge state value and charge precision of a first battery; determining a state of charge interval of a second battery according to the state of charge value and the state of charge accuracy of a first battery, wherein the state of charge accuracy of the first battery is higher than the state of charge accuracy of the second battery; and correcting the state of charge value of the second battery based on the state of charge interval.
Optionally, the method further comprises: acquiring target current and initial capacity of the hybrid battery; the state-of-charge value of the hybrid battery is determined based on the target current and the initial capacity.
According to another aspect of the embodiments of the present invention, there is also provided a control apparatus of a hybrid battery including a plurality of types of batteries, the apparatus including: the acquiring module is used for acquiring the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery; the determining module is used for determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
Optionally, the hybrid battery includes a first battery, and the obtaining module is further configured to obtain a second attenuation coefficient and a first preset charge value of the first battery, where the second attenuation coefficient is a capacity attenuation coefficient of the first battery, and the first preset charge value is an upper capacity limit of the hybrid battery; the determining module is further used for determining a first attenuation coefficient according to the second attenuation coefficient and the first preset charge value.
Optionally, the hybrid battery includes a second battery, and the obtaining module is further configured to obtain a plurality of first sampled charge values, where the first sampled charge values are upper capacity limits of the second battery in a full charge state; the determining module is further used for determining a second attenuation coefficient according to the first preset charge value and the average value of the plurality of first sampling charge values.
Optionally, the hybrid battery includes a second battery, and the obtaining module is further configured to obtain a fourth attenuation coefficient and a second preset charge value of the second battery, where the fourth attenuation coefficient is a capacity attenuation coefficient of the second battery, and the second preset charge value is a lower capacity limit of the hybrid battery; the determining module is further used for determining a third attenuation coefficient according to the fourth attenuation coefficient and a second preset charge value.
Optionally, the hybrid battery includes a first battery, and the obtaining module is further configured to obtain a fourth attenuation coefficient of the second battery, including: acquiring a plurality of second sampling charge values, wherein the second sampling charge values are the lower limit of the capacity of the first battery in the emptying state; and determining a fourth attenuation coefficient according to the second preset charge value and the average value of the plurality of second sampling charge values.
Optionally, the hybrid battery includes a first battery and a second battery, and the obtaining module is further configured to obtain a state of charge value and a charge accuracy of the first battery; the determining module is further used for determining a state of charge interval of the second battery according to the state of charge value and the state of charge accuracy of the first battery, wherein the state of charge accuracy of the first battery is higher than the state of charge accuracy of the second battery; the control device of the hybrid battery further includes: and the correction module is used for correcting the state of charge value of the second battery based on the state of charge interval.
Optionally, the obtaining module is further configured to obtain a target current and an initial capacity of the hybrid battery; the determination module is further configured to determine a state of charge value for the hybrid battery based on the target current and the initial capacity.
According to another aspect of the embodiments of the present invention, there is also provided a non-volatile storage medium having a computer program stored therein, wherein the computer program is configured to execute the control method of the hybrid battery in any one of the above when running.
According to another aspect of the embodiments of the present invention, there is also provided an electronic apparatus including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the control method of the hybrid battery in any one of the above.
In the embodiment of the invention, the attenuation coefficient corresponding to each type of battery in the multiple types of batteries is obtained, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery, and then the target attenuation coefficient corresponding to the hybrid battery is determined based on the attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery, so that the aim of accurately estimating the state of charge of the hybrid battery is fulfilled, the technical effect of improving the estimation accuracy of the state of charge of the hybrid battery is realized, and the technical problem of low estimation accuracy of the state of charge of the hybrid battery is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a control method of a hybrid battery according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a capacity region of a hybrid battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a capacity region of another hybrid battery according to an embodiment of the present invention;
fig. 4 is a block diagram of a control apparatus of a hybrid battery according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with an embodiment of the present invention, there is provided an embodiment of a control method for a hybrid battery, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
The method embodiments may be performed in an electronic device or similar computing device that includes a memory and a processor. For example, operating on a vehicle terminal, the vehicle terminal may include one or more processors (which may include, but are not limited to, processing devices such as Central Processing Units (CPUs), Graphics Processing Units (GPUs), Digital Signal Processing (DSP) chips, Microprocessors (MCUs), programmable logic devices (FPGAs), neural Network Processors (NPUs), Tensor Processors (TPUs), Artificial Intelligence (AI) type processors, etc.) and memory for storing data. And a memory for storing data. Optionally, the vehicle terminal may further include a transmission device for a communication function, an input-output device, and a display device. It will be appreciated by those skilled in the art that the foregoing structural description is merely illustrative and not limiting of the structure of the vehicle terminal described above. For example, the vehicle terminal may also include more or fewer components than described above, or have a different configuration than described above.
The memory may be used to store computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the information processing method in the embodiments of the present invention, and the processor executes various functional applications and data processing by running the computer programs stored in the memory, that is, implements the information processing method described above. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory located remotely from the processor, and these remote memories may be connected to the mobile terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
The display device may be, for example, a touch screen type Liquid Crystal Display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI) with which a user can interact by touching finger contacts and/or gestures on a touch-sensitive surface, where the human-machine interaction function optionally includes the following interactions: executable instructions for creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, emailing, call interfacing, playing digital video, playing digital music, and/or web browsing, etc., for performing the above-described human-computer interaction functions, are configured/stored in one or more processor-executable computer program products or readable storage media.
In an embodiment of the present invention, a control method of a hybrid battery operated in the vehicle terminal is provided, and fig. 1 is a flowchart of a control method of a hybrid battery according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S11, obtaining the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the attenuation coefficient is used for representing the percentage of the attenuation of each type of battery in the attenuation of the hybrid battery;
the hybrid battery comprises at least two battery cells. For example, the hybrid battery comprises a ternary lithium battery and a lithium iron phosphate battery, in the whole-pack layout of the hybrid battery, the lithium iron phosphate battery is fully charged firstly, the ternary battery is emptied firstly, the lithium iron phosphate battery and the ternary battery are connected in series, and the charged electric quantity and the discharged electric quantity are completely the same.
It should be noted that, in the embodiment of the present invention, two types of the ternary lithium battery and the lithium iron phosphate battery are taken as examples, and no specific limitation is imposed on the type and number of the cells of the hybrid battery.
And step S12, determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each of the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery. The target attenuation coefficient is a capacity attenuation coefficient of the hybrid battery.
Specifically, the minimum value of the attenuation coefficients corresponding to the plurality of types of cells in the hybrid cell is determined as the target attenuation coefficient corresponding to the hybrid cell. For example, the hybrid battery includes a ternary lithium battery and a lithium iron phosphate battery, wherein the percentage of the attenuation of the ternary lithium battery in the attenuation of the hybrid battery is SOH 1s The percentage of the attenuation of the lithium iron phosphate battery in the attenuation of the hybrid battery is SOH 1t The target attenuation coefficient SOH is min (SOH) 1s ,SOH 1t )。
Based on the steps S11 to S12, the attenuation coefficient corresponding to each type of battery in the multiple types of batteries is obtained, wherein the attenuation coefficient is used for representing the ratio of the attenuation of each type of battery in the attenuation of the hybrid battery, and then the target attenuation coefficient corresponding to the hybrid battery is determined based on the attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery, so that the purpose of accurately estimating the state of charge of the hybrid battery is achieved, the technical effect of improving the estimation accuracy of the state of charge of the hybrid battery is achieved, and the technical problem that the estimation accuracy of the state of charge of the hybrid battery is low is solved.
The following further describes a control method of the hybrid battery provided in the embodiment of the present application.
FIG. 2 is a schematic diagram of a capacity interval of a hybrid battery, a nominal capacity Cap of a ternary lithium battery, according to an embodiment of the present invention s 100Ah, and the use interval is 0-90%; nominal capacity Cap of lithium iron phosphate battery t 94.7Ah, and the use interval is 5-100%. Wherein, Cap s >Cap 1 ,Cap t >Cap 1 . Then SOC high Is 90%, SOC low The content was 5%. Full package nominal capacity Cap of hybrid Battery 1 The capacity of the ternary lithium battery or the ferric phosphate lithium battery is defined as 90Ah, and when the capacity of the ternary lithium battery or the ferric phosphate lithium battery is attenuated, the whole package capacity is supplemented by improving the upper limit of the capacity of the ternary lithium battery and reducing the lower limit of the capacity of the ferric phosphate lithium battery, so that the whole package capacity is not attenuated.
In an alternative embodiment, the hybrid battery includes a first battery, and obtaining a first attenuation coefficient corresponding to the first battery includes:
step S111, acquiring a second attenuation coefficient and a first preset charge value of the first battery, wherein the second attenuation coefficient is the capacity attenuation coefficient of the first battery, and the first preset charge value is the upper limit of the capacity of the hybrid battery;
specifically, taking the example that the hybrid battery includes a ternary lithium battery and a lithium iron phosphate battery, the first battery may be a ternary lithium battery, and the first attenuation coefficient is a capacity attenuation ratio of the ternary lithium battery to a partial SOH of the capacity attenuation ratio of the hybrid battery in the whole package capacity attenuation 1s . The second attenuation coefficient is the capacity attenuation coefficient SOH of the ternary lithium battery s SOH can be obtained by the following formula s ：
SOH s ＝Cap s1 /Cap s
Wherein, Cap s1 Is the attenuated battery capacity of the ternary lithium batteryAmount, Cap s Is the initial battery capacity of the ternary lithium battery.
The initial capacity Cap1 of the hybrid battery can be determined according to the initial capacity Cap of the ternary lithium battery s Initial capacity Cap of lithium iron phosphate battery t And determining the respective use intervals of the two batteries, wherein the initial capacity is the nominal capacity of the battery.
And step S112, determining a first attenuation coefficient according to the second attenuation coefficient and the first preset charge value.
In particular, by the second attenuation coefficient SOH s And a first predetermined charge value SOC high Determines a first attenuation coefficient. For example, the first attenuation coefficient SOH is determined by the following formula 1s ：
SOH 1s ＝100％(SOH s ≥SOC high )
SOH 1s ＝(SOH s *Cap s )/Cap1(SOH s ＜SOC high )
Based on the steps S111 to S112, the ratio of the attenuation of the first battery to the attenuation of the hybrid battery can be accurately calculated by obtaining the second attenuation coefficient and the first preset charge value of the first battery, and then determining the first attenuation coefficient according to the second attenuation coefficient and the first preset charge value.
In an alternative embodiment, in step S111, obtaining the second attenuation coefficient of the first battery includes:
step 1111, acquiring a plurality of first sampling charge values, wherein the first sampling charge values are the upper limit of the capacity of the second battery in the full charge state;
in step S1112, a second attenuation coefficient is determined according to the first preset charge value and an average value of the plurality of first sampled charge values.
Specifically, the second battery may be a lithium iron phosphate battery, and when the lithium iron phosphate battery is in a full charge state, the n first sampling charge values are recorded and stored in a memory of the computer. Removing a maximum value and a minimum value from the n first sample charge values, and then calculating n-2 first sample charges by the following formulaMean value of the values SOC high_mean ：
According to a first preset charge value SOC high And an average value SOC of the plurality of first sampled charge values high_mean Determining the capacity attenuation coefficient SOH of the ternary lithium battery by the following formula s ：
SOH s ＝SOC high /SOC high_mean
For example, the computer stores the SOC corresponding to 5 lithium iron phosphate batteries when the lithium iron phosphate batteries are fully charged high Point: 91%, 92%, 91.5%, 95%, 92.5%, removing a maximum value of 95% and a minimum value of 91% from the above 5 first sampled charge values, and then calculating an average value SOC of the 3 first sampled charge values high_mean Comprises the following steps: (91.5% + 92% + 92.5%)/3 ═ 92%, SOC high 90 percent of the capacity attenuation coefficient SOH of the ternary lithium battery s Comprises the following steps: 90%/92% > -97.8%.
Based on the steps S1111 to S1112, the capacity attenuation coefficient of the first battery can be accurately calculated by obtaining a plurality of first sampled charge values and determining the second attenuation coefficient according to the first preset charge value and the average value of the plurality of first sampled charge values.
In an alternative embodiment, obtaining the third attenuation coefficient corresponding to the second battery includes:
step S113, acquiring a fourth attenuation coefficient and a second preset charge value of the second battery, wherein the fourth attenuation coefficient is the capacity attenuation coefficient of the second battery, and the second preset charge value is the lower limit of the capacity of the hybrid battery;
specifically, taking the hybrid battery including a ternary lithium battery and a lithium iron phosphate battery as an example, the third attenuation coefficient is the SOH of the capacity attenuation ratio of the lithium iron phosphate battery to the whole package capacity attenuation of the hybrid battery 1t . The fourth attenuation coefficient is the capacity attenuation coefficient SOH of the lithium iron phosphate battery t SOH can be obtained by the following formula t ：
SOH t ＝Cap t1 /Cap t
Wherein, Cap t1 The decayed battery capacity, Cap, of the lithium iron phosphate battery t The initial battery capacity of the lithium iron phosphate battery.
And step S114, determining a third attenuation coefficient according to the fourth attenuation coefficient and a second preset charge value.
In particular, according to a fourth attenuation coefficient SOH t And a second predetermined charge value SOC low The third attenuation coefficient SOH is determined by the following formula 1t ：
SOH 1t ＝100％(SOH t ≥(1-SOC low ))
SOH 1t ＝(SOH t *Cap t )/Cap1(SOH t ＜(1-SOC low ))
Based on the above steps S113 to S114, the ratio of the attenuation of the second battery to the attenuation of the hybrid battery can be accurately calculated by obtaining the fourth attenuation coefficient and the second preset charge value of the second battery, and then determining the third attenuation coefficient according to the fourth attenuation coefficient and the second preset charge value.
In an alternative embodiment, the step S113 of obtaining the fourth attenuation coefficient of the second battery includes:
step S1131, a plurality of second sampling charge values are obtained, wherein the second sampling charge values are the lower capacity limit of the first battery in the emptying state;
step S1132, determining a fourth attenuation coefficient according to the second preset charge value and an average value of the plurality of second sampled charge values.
Specifically, the first battery is a ternary lithium battery, and when the ternary lithium battery is in an emptying state, n second sampling charge values are recorded and stored in a memory of the computer. Removing a maximum value and a minimum value from the n second sampled charge values, and then calculating an average value SOC of the n-2 second sampled charge values by the following formula low_mean ：
According to a second preset charge value SOC low And an average value SOC of the plurality of second sampled charge values low_mean Determining the capacity attenuation coefficient SOH of the lithium iron phosphate battery by the following formula t ：
For example, the computer stores the corresponding SOC when 5 ternary lithium batteries are discharged low Point: 1%, 2.5%, 3%, 3.5%, 4%. Removing a maximum value of 4% and a minimum value of 1% from the 5 second sampled charge values, and calculating an average value of the 3 second sampled charge values
Comprises the following steps: (2.5% + 3% + 3.5%)/3 ═ 3%, SOC low 5 is 5%, and the capacity attenuation coefficient SOH of the lithium iron phosphate battery t Comprises the following steps:
based on the above steps S1131 to S1132, the capacity attenuation coefficient of the second battery can be accurately calculated by obtaining a plurality of second sampled charge values and then determining the fourth attenuation coefficient according to the second preset charge value and the average value of the plurality of second sampled charge values.
In an alternative embodiment, the control method of the hybrid battery further includes:
step S13, acquiring the state of charge value and the charge precision of the first battery;
step S14, determining a state-of-charge interval of a second battery according to the state-of-charge value and the state-of-charge accuracy of a first battery, wherein the state-of-charge accuracy of the first battery is higher than that of the second battery;
in step S15, the state of charge value of the second battery is corrected based on the state of charge interval.
Also included in the hybrid battery isThe SOC estimation of the ternary lithium battery is accurate, and the SOC estimation of the lithium iron phosphate battery is more difficult. Because the lithium iron phosphate battery and the ternary lithium battery are connected in series, the capacities of the charged ternary region and the lithium iron region are the same under the condition that the batteries do not generate self-discharge and balance. As shown in fig. 2, the mapping interval of the hybrid battery specifically includes: ternary interval 0-SOC high And the lithium iron interval is SOC low ～100％。
The SOC value of the ternary lithium battery is SOC s The state of charge value of the lithium iron phosphate battery is SOC t The mapping formula of the two is as follows:
FIG. 3 is a schematic diagram of a capacity interval of another hybrid battery according to an embodiment of the invention, as shown in FIG. 3, obtaining a state of charge (SOC) of a three-way battery s And the charged precision is n percent to obtain the precision upper and lower deviation (SOC) s -n％,SOC s + n%), and further calculating the end point of the state of charge interval of the lithium iron phosphate battery by the following formula:
further, according to the state of charge interval [ SOC ] of the lithium iron phosphate battery t1 ,SOC t2 ]And correcting the state of charge value of the lithium iron phosphate battery. Specifically, the state of charge value SOC of the lithium iron phosphate battery t At [ SOC ] t1 ,SOC t2 ]During the interval, if SOC t <SOC t1 Will SOC t Corrected to SOC t1 (ii) a If SOC t >SOC t2 Will SOC t Corrected to SOC t2 . Thereby being capable of being on the platformZone correction of state of charge (SOC) of lithium iron phosphate battery t Therefore, the estimation accuracy of the state of charge of the lithium iron phosphate battery is improved.
For example, the state of charge SOC of a ternary lithium battery s The accuracy is 40%, the charging accuracy is 3%, the accuracy upper and lower deviations are (37%, 43%), and further the end points of the state of charge interval of the lithium iron phosphate battery are obtained:
if SOC at that time t To 50%, the SOC t The correction is 45.38%; if SOC at that time t At 30%, the SOC is set t The correction was 39.05%.
Based on the steps S13 to S15, the state of charge value and the state of charge accuracy of the first battery are obtained, the state of charge interval of the second battery is determined according to the state of charge value and the state of charge accuracy of the first battery, and finally the state of charge value of the second battery is corrected based on the state of charge interval, so that the estimation accuracy of the state of charge of the second battery can be effectively improved, and the risk of overcharge or overdischarge of the hybrid battery is reduced.
In an alternative embodiment, the control method of the hybrid battery further includes:
step S16, acquiring target current and initial capacity of the hybrid battery;
in step S17, a state of charge value of the hybrid battery is determined based on the target current and the initial capacity.
Specifically, a target current I and an initial capacity Cap1 of the hybrid battery are obtained, and a state of charge value SOC of the hybrid battery is determined in the following manner pack ：
Specifically, when the capacity of the ternary lithium battery is attenuated, the SOC of the ternary lithium battery high The point will be raised, the whole package capacity will not be attenuated, only when the SOC is high After the point reaches 100% SOC of the ternary lithium battery, the ternary lithium battery is continuously attenuated, and the whole package capacity of the hybrid battery is attenuated. When the capacity of the lithium iron phosphate battery is attenuated, the lower limit of the capacity of the hybrid battery can shift downwards, the whole package capacity can not be attenuated, and only when the SOC is reached low When the point reaches 0% SOC of the lithium iron phosphate battery, the whole package capacity of the hybrid battery is attenuated. The initial capacity of the hybrid battery can be obtained by the following formula:
Cap1＝Cap s *(SOC high -0)＝Cap t *(1-SOC low )
in the embodiment of the application, the attenuation coefficient corresponding to each type of battery in the multiple types of batteries is obtained, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery, and then the target attenuation coefficient corresponding to the hybrid battery is determined based on the attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery, so that the purpose of accurately estimating the state of charge of the hybrid battery is achieved, the technical effect of improving the estimation accuracy of the state of charge of the hybrid battery is achieved, and the technical problem that the estimation accuracy of the state of charge of the hybrid battery is low is solved.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a control device for a hybrid battery is further provided, and the control device is used to implement the above embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 4 is a block diagram showing a configuration of a control apparatus for a hybrid battery according to an embodiment of the present invention, the hybrid battery including a plurality of types of batteries, as shown in fig. 4, the apparatus including:
an obtaining module 401, configured to obtain an attenuation coefficient corresponding to each of multiple types of batteries, where the attenuation coefficient is used to represent a ratio of attenuation of each type of battery to attenuation of a hybrid battery;
a determining module 402, configured to determine a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each of the plurality of types of batteries, where the target attenuation coefficient is used to determine a state of charge of the hybrid battery.
Optionally, the hybrid battery includes a first battery, and the obtaining module 401 is further configured to obtain a second attenuation coefficient and a first preset charge value of the first battery, where the second attenuation coefficient is a capacity attenuation coefficient of the first battery, and the first preset charge value is an upper capacity limit of the hybrid battery; the determining module 402 is further configured to determine a first attenuation factor according to the second attenuation factor and the first predetermined charge value.
Optionally, the hybrid battery includes a second battery, and the obtaining module 401 is further configured to obtain a plurality of first sampled charge values, where the first sampled charge values are upper capacity limits of the second battery in a full charge state; the determining module 402 is further configured to determine a second attenuation coefficient according to the first preset charge value and an average value of the plurality of first sampled charge values.
Optionally, the hybrid battery includes a second battery, and the obtaining module 401 is further configured to obtain a fourth attenuation coefficient and a second preset charge value of the second battery, where the fourth attenuation coefficient is a capacity attenuation coefficient of the second battery, and the second preset charge value is a lower capacity limit of the hybrid battery; the determining module 402 is further configured to determine a third attenuation coefficient according to the fourth attenuation coefficient and the second preset charge value.
Optionally, the hybrid battery includes a first battery, and the obtaining module 401 is further configured to obtain a fourth attenuation coefficient of the second battery, including: acquiring a plurality of second sampling charge values, wherein the second sampling charge values are the lower limit of the capacity of the first battery in the emptying state; and determining a fourth attenuation coefficient according to the second preset charge value and the average value of the plurality of second sampling charge values.
Optionally, the hybrid battery includes a first battery and a second battery, and the obtaining module 401 is further configured to obtain a state of charge value and a charge precision of the first battery; the determining module 402 is further configured to determine a state of charge interval of the second battery according to the state of charge value and the state of charge accuracy of the first battery, where the state of charge accuracy of the first battery is higher than the state of charge accuracy of the second battery; the control device of the hybrid battery further includes: and a correction module 403, configured to correct the state of charge value of the second battery based on the state of charge interval.
Optionally, the obtaining module 401 is further configured to obtain a target current and an initial capacity of the hybrid battery; the determination module 402 is further configured to determine a state of charge value of the hybrid battery based on the target current and the initial capacity.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Embodiments of the present invention also provide a non-volatile storage medium having a computer program stored therein, wherein the computer program is configured to perform the steps of any of the above method embodiments when executed.
Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, obtaining the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery;
and S2, determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each of the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
An embodiment of the present invention further provides a processor configured to run a computer program to perform the steps in any one of the method embodiments described above.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, obtaining the attenuation coefficient corresponding to each type of battery in the plurality of types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery;
and S2, determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each of the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A control method of a hybrid battery including a plurality of types of batteries, characterized by comprising:
obtaining an attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery;
and determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each of the multiple types of batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
2. The control method of the hybrid battery according to claim 1, the hybrid battery including a first battery, wherein obtaining the first attenuation coefficient corresponding to the first battery includes:
acquiring a second attenuation coefficient and a first preset charge value of the first battery, wherein the second attenuation coefficient is the capacity attenuation coefficient of the first battery, and the first preset charge value is the upper limit of the capacity of the hybrid battery;
and determining the first attenuation coefficient according to the second attenuation coefficient and the first preset charge value.
3. The control method of a hybrid battery according to claim 2, the hybrid battery including a second battery, wherein the obtaining the second attenuation coefficient of the first battery includes:
acquiring a plurality of first sampling charge values, wherein the first sampling charge values are the upper capacity limit of the second battery in a full charge state;
and determining the second attenuation coefficient according to the first preset charge value and the average value of the plurality of first sampling charge values.
4. The control method of the hybrid battery according to claim 1, wherein the hybrid battery includes a second battery, and wherein obtaining a third attenuation coefficient corresponding to the second battery includes:
acquiring a fourth attenuation coefficient and a second preset charge value of the second battery, wherein the fourth attenuation coefficient is the capacity attenuation coefficient of the second battery, and the second preset charge value is the lower limit of the capacity of the hybrid battery;
and determining the third attenuation coefficient according to the fourth attenuation coefficient and the second preset charge value.
5. The control method of a hybrid battery according to claim 4, the hybrid battery including a first battery, wherein the obtaining the fourth attenuation coefficient of the second battery includes:
acquiring a plurality of second sampling charge values, wherein the second sampling charge values are the lower limit of the capacity of the first battery in the emptying state;
and determining the fourth attenuation coefficient according to the second preset charge value and the average value of the plurality of second sampling charge values.
6. The control method of a hybrid battery according to claim 1, the hybrid battery including a first battery and a second battery, characterized by further comprising:
acquiring a charge state value and charge precision of the first battery;
determining a state of charge interval of the second battery according to the state of charge value and the state of charge accuracy of the first battery, wherein the state of charge accuracy of the first battery is higher than the state of charge accuracy of the second battery;
and correcting the state of charge value of the second battery based on the state of charge interval.
7. The control method of a hybrid battery according to claim 1, characterized by further comprising:
acquiring a target current and an initial capacity of the hybrid battery;
determining a state-of-charge value for the hybrid battery based on the target current and the initial capacity.
8. A control device for a hybrid battery including a plurality of types of batteries, the device comprising:
the obtaining module is used for obtaining an attenuation coefficient corresponding to each type of battery in the multiple types of batteries, wherein the attenuation coefficient is used for representing the proportion of the attenuation of each type of battery in the attenuation of the hybrid battery;
the determining module is used for determining a target attenuation coefficient corresponding to the hybrid battery based on the attenuation coefficient corresponding to each type of the batteries, wherein the target attenuation coefficient is used for determining the state of charge of the hybrid battery.
9. A non-volatile storage medium, characterized in that a computer program is stored in the storage medium, wherein the computer program is arranged to execute the control method of the hybrid battery according to any one of claims 1 to 7 when running.
10. An electronic device comprising a memory and a processor, wherein the memory has a computer program stored therein, and the processor is configured to run the computer program to perform the control method of the hybrid battery according to any one of claims 1 to 7.
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