CN112671071A - Charging control method, charging control device, storage medium, and electronic apparatus - Google Patents
Charging control method, charging control device, storage medium, and electronic apparatus Download PDFInfo
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Abstract
The disclosure provides a charging control method, a charging control device, a computer readable storage medium and an electronic device, and relates to the technical field of charging. The charging control method comprises the following steps: determining the actual internal resistance value of the battery in the current charging stage; updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; determining to enter a next charging phase when the voltage of the battery reaches the cutoff voltage. The charging time of the battery can be reduced, and the charging efficiency of the battery is effectively improved.
Description
Technical Field
The present disclosure relates to the field of charging technologies, and in particular, to a charging control method, a charging control apparatus, a computer-readable storage medium, and an electronic device.
Background
In daily life, a battery is used as a carrier for power supply of a mobile terminal to operate the basis of diversified functions in the mobile terminal, and the development of the battery is receiving wide attention. In order to improve the cruising ability of the battery and provide good use experience for users, the quick charging of the battery is a very important problem.
In the prior art, common battery charging methods include CCCV (Constant-current Constant-voltage) and segmented Constant-current charging, wherein the common battery charging methods include a Constant-current charging stage. In practical applications, as the service life of the battery increases, the battery usually ages, so that the internal resistance of the battery increases. At this moment, because the battery state changes, no matter which charging mode is adopted, the charging is difficult to be carried out according to the preset quick charging mode, the increase of the whole charging time of the battery is caused, and the use experience of a user on quick charging is influenced.
Disclosure of Invention
The present disclosure provides a charging control method, a charging control apparatus, a computer-readable storage medium, and an electronic device, so as to improve the charging efficiency of the prior art at least to a certain extent and reduce the charging time.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to a first aspect of the present disclosure, there is provided a charge control method including: determining the actual internal resistance value of the battery in the current charging stage; updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; determining to enter a next charging phase when the voltage of the battery reaches the cutoff voltage.
According to a second aspect of the present disclosure, there is provided a charge control device including: the actual internal resistance value determining module is used for determining the actual internal resistance value of the battery in the current charging stage; the cut-off voltage updating module is used for updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; a charging phase determination module for determining to enter a next charging phase when the voltage of the battery reaches the cutoff voltage.
According to a third aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the charging control method of the first aspect described above and possible implementations thereof.
According to a fourth aspect of the present disclosure, there is provided an electronic device comprising: a processor; a memory for storing executable instructions of the processor. Wherein the processor is configured to execute the charging control method of the first aspect and possible implementations thereof via execution of the executable instructions.
The technical scheme of the disclosure has the following beneficial effects:
determining the actual internal resistance value of the battery in the current charging stage; updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; when the voltage of the battery reaches the cutoff voltage, it is determined that the next charge phase is entered. On one hand, the present exemplary embodiment provides a new charging control method, considering that the internal resistance of the battery may change during the charging process, the cut-off voltage is updated based on the actual internal resistance value and the reference internal resistance value, so that the charging strategy of the battery can be adaptively adjusted in time according to the change of the internal resistance of the battery, and the method has higher flexibility; on the other hand, when the internal resistance of the battery increases, floating voltage is often generated, and the overall charging time is prolonged, the cut-off voltage can be updated through internal resistance change, and the generated floating voltage is compensated by the updated cut-off voltage, so that the battery can be rapidly and accurately charged, and the battery has high charging efficiency; on the other hand, the charging control method of the exemplary embodiment has a simple flow and low hardware cost, can well control the charging process of the battery, and has a wide application range.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
FIG. 1 shows a schematic diagram of a system architecture in the present exemplary embodiment;
fig. 2 is a block diagram showing an electronic apparatus in the present exemplary embodiment;
fig. 3 shows a flowchart of a charging control method in the present exemplary embodiment;
fig. 4 shows a sub-flowchart of a charging control method in the present exemplary embodiment;
fig. 5 shows a sub-flowchart of another charge control method in the present exemplary embodiment;
fig. 6 shows a configuration diagram of a charge control device in the present exemplary embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The CCCV charging method is to charge a certain charging current to a cut-off voltage, and then charge the cut-off voltage to a cut-off current to complete the charging process. For example, the current is 1C (battery charge/discharge capacity rate), that is, the current of 1 rate battery capacity, and assuming that the battery capacity is 3000mAh (milliampere hours), the current is 3A (ampere), and the battery is charged to a cut-off voltage, for example, 4.2V (volt), and then charged at a constant voltage of 4.2V until the current is reduced to a cut-off current, for example, 0.02C, that is, the battery capacity is 3000mAh, and the cut-off current is 60 mA.
The charging mode of the segmented constant current is a mode of continuously adjusting the charging current according to the state information of the battery for charging, for example, I is firstly used1Constant current charging is carried out until t1At a time and then I2Constant current charging t2At the moment of time, with I3Charging at constant current t3Time of day, etc. In which charging may be performed at a current exceeding the rated rate in an initial charging stage, such as a battery with a rated current of 3C, beginning at t0To t1The current in time is 3.5C, the charging speed can be maximized. The current of the constant current charging is gradually reduced along with the increase of the charging time, and the reason of the current reduction needs to consider various factors, such as the heating state of the battery during the charging process, and the final cut-off current is also defined according to the capacity full-charge at the time of factory shipment.
No matter the CCCV or the segmented constant current charging mode is adopted, the process of charging to a certain rated voltage by adopting a certain current and then charging at the voltage is required. However, when the battery is aged, it is difficult to perform an initial predetermined rapid charging process in the above manner. Specifically, when the battery is aged, the internal resistance of the battery increases due to the structural change of the positive and negative electrode materials, the reduction of the electrolyte, or by-products generated by side reactions, and the like, and at this time, the floating pressure generated by the internal resistance also increases. The floating voltage is a voltage difference between the voltage of the battery and the collected voltage when the current passes through the battery and is inconsistent with the collected voltage, namely the floating voltage is a test voltage-the open-circuit voltage of the battery.
For example, a battery can be charged by first using a large current of 4A for constant current charging, and when the charging voltage becomes 4.2V, the battery jumps to a small current of 3A for charging. When a new battery having an internal resistance of 30m Ω (milliohm) is charged with this current, the floating voltage generated is V' 4 × 0.03V-0.12V, and the open-circuit voltage of the battery is 4.2-0.12V. However, when the battery is aged, the internal resistance is increased to 60m Ω, the floating voltage value becomes 0.24V, and the open circuit voltage value becomes 3.96V. At this time, the charging condition of 3A is jumped to, and the voltage is reduced from 4.08V to 3.96V, thereby shortening the charging time of the large current 4A and simultaneously increasing the charging time of the small current 3A. In addition, after the internal resistance of the battery is increased, the floating voltage value generated by the large current is larger, so that the time for charging the large current is shortened more, and the charging time of the whole battery is increased.
Similarly, for the conventional CCCV charging mode, when the aging internal resistance of the battery increases and the generated floating voltage value increases in the constant current stage, the battery enters the constant voltage stage in advance, which results in that the time of the original constant voltage charging stage is prolonged and the charging time is increased.
In view of the above, the present exemplary embodiment provides a charging control method capable of automatically adjusting a charging strategy of a battery according to the aging condition of a battery teacher to perform a fast and efficient charging process. FIG. 1 shows a system architecture diagram of an environment in which the exemplary embodiment operates. As shown in fig. 1, the system architecture 100 may include a mobile terminal 110 and a server 120, which interact with each other via a network, for example, the server 120 returns voltage data to the mobile terminal 110, and the mobile terminal 110 updates the cutoff voltage of the current charging phase based on the voltage data. The server 120 is a background server providing internet services; the mobile terminal 110 refers to an electronic device equipped with a battery and having a battery charging requirement, and includes but is not limited to a smart phone, a tablet computer, a game machine, a wearable device, and the like.
It should be understood that the number of devices in fig. 1 is merely exemplary. Any number of mobile terminals may be provided, or a server may be a cluster of multiple servers, as desired.
The charging control method provided by the embodiment of the present disclosure may be executed by the mobile terminal 110, for example, in the mobile terminal 110, the cut-off voltage of the current charging stage is updated according to the reference internal resistance value and the actual internal resistance value of the battery, and the charging process is performed based on the cut-off voltage; the determination may also be performed by the server 120, for example, the server 120 determines an actual internal resistance value of a battery in the mobile terminal 110 according to the usage state of the battery, and determines a cut-off voltage according to the reference internal resistance value and the actual internal resistance value, and returns the cut-off voltage to the mobile terminal 110, so that the mobile terminal 110 performs a charging process according to the cut-off voltage, and the like, which is not specifically limited by the present disclosure.
Exemplary embodiments of the present disclosure also provide an electronic device for executing the above-described charging control method. The electronic device may be the mobile terminal 110 or the server 120 described above. Generally, an electronic device includes a processor and a memory. The memory is used for storing executable instructions of the processor and can also be used for storing application data; the processor is configured to execute the charging control method in the present exemplary embodiment via execution of executable instructions.
The structure of the electronic device is exemplarily described below by taking the mobile terminal 200 in fig. 2 as an example. It will be appreciated by those skilled in the art that the configuration of figure 2 can also be applied to fixed type devices, in addition to components specifically intended for mobile purposes.
As shown in fig. 2, the mobile terminal 200 may specifically include: a processor 210, an internal memory 221, an external memory interface 222, a USB (Universal Serial Bus) interface 230, a charging management Module 240, a power management Module 241, a battery 242, an antenna 1, an antenna 2, a mobile communication Module 250, a wireless communication Module 260, an audio Module 270, a speaker 271, a microphone 272, a microphone 273, an earphone interface 274, a sensor Module 280, a display 290, a camera Module 291, a pointer 292, a motor 293, a button 294, and a SIM (Subscriber identity Module) card interface 295.
Processor 210 may include one or more processing units, such as: the Processor 210 may include an AP (Application Processor), a modem Processor, a GPU (Graphics Processing Unit), an ISP (Image Signal Processor), a controller, an encoder, a decoder, a DSP (Digital Signal Processor), a baseband Processor, and/or an NPU (Neural-Network Processing Unit), etc. The encoder may encode (i.e., compress) image or video data; the decoder may decode (i.e., decompress) the codestream data of the image or video to restore the image or video data.
In some embodiments, processor 210 may include one or more interfaces through which connections are made to other components of mobile terminal 200.
Internal memory 221 may be used to store computer-executable program code, which includes instructions. The internal memory 221 may include a volatile memory, a non-volatile memory, and the like. The processor 210 executes various functional applications of the mobile terminal 200 and data processing by executing instructions stored in the internal memory 221 and/or instructions stored in a memory provided in the processor.
The external memory interface 222 may be used to connect an external memory, such as a Micro SD card, for expanding the storage capability of the mobile terminal 200. The external memory communicates with the processor 210 through the external memory interface 222 to perform data storage functions, such as storing music, video, and other files.
The USB interface 230 is an interface conforming to the USB standard specification, and may be used to connect a charger to charge the mobile terminal 200, or connect an earphone or other electronic devices.
The charge management module 240 is configured to receive a charging input from a charger. While the charging management module 240 charges the battery 242, the power management module 241 may also supply power to the device; the power management module 241 may also monitor the state of the battery, such as monitoring internal resistance changes or temperature changes of the battery.
The wireless communication function of the mobile terminal 200 may be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, a modem processor, a baseband processor, and the like. The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. The mobile communication module 250 may provide a solution including 2G/3G/4G/5G wireless communication applied on the mobile terminal 200. The Wireless Communication module 260 may provide Wireless Communication solutions applied to the mobile terminal 200, including WLAN (Wireless Local Area Networks ) (e.g., Wi-Fi (Wireless Fidelity, Wireless Fidelity) Networks), BT (Bluetooth), GNSS (Global Navigation Satellite System), FM (Frequency Modulation), NFC (Near Field Communication), IR (Infrared technology), and the like.
The mobile terminal 200 may implement a display function through the GPU, the display screen 290, the AP, and the like, and display a user interface. The mobile terminal 200 may implement a shooting function through the ISP, the camera module 291, the encoder, the decoder, the GPU, the display 290, the AP, and the like, and may also implement an audio function through the audio module 270, the speaker 271, the receiver 272, the microphone 273, the earphone interface 274, the AP, and the like.
The sensor module 280 may include a depth sensor 2801, a pressure sensor 2802, a gyroscope sensor 2803, a barometric pressure sensor 2804, etc. to implement different sensing functions.
Indicator 292 may be an indicator light that may be used to indicate a state of charge, a change in charge, or may be used to indicate a message, missed call, notification, etc. The motor 293 may generate a vibration cue, may also be used for touch vibration feedback, and the like. The keys 294 include a power-on key, a volume key, and the like.
The mobile terminal 200 may support one or more SIM card interfaces 295 for connecting to a SIM card to implement functions such as telephony and data communications.
Fig. 3 shows an exemplary flow of the charge control method, including the following steps S310 to S330:
in step S310, the actual internal resistance value of the battery in the current charging phase is determined.
When the battery works, the current flowing through the battery interior can be subjected to certain resistance, namely the internal resistance of the battery. With the increase of the working time of the battery, the internal resistance of the battery changes due to the influence of factors such as the change of the structure of the anode and cathode materials of the battery, the change of the electrolyte or the generation of byproducts during the reaction, for example, the internal electrolyte is reduced and the internal resistance of the battery is increased with the increase of the service time of the battery.
The current charging phase may be a phase of charging with a constant current or a current varying in a small amplitude range, for example, a phase of charging with a constant current of 3.0A, or a phase of charging with a small amplitude fluctuation current in a range of 2.5A to 3.0A. The actual internal resistance value refers to the internal resistance value of the battery in the current charging stage when the above-mentioned influence factors are considered, for example, the internal resistance value of the battery in the current constant current charging stage when the battery is charged again after N times of charging and discharging processes. In the present exemplary embodiment, the actual internal resistance value of the battery may be measured by configuring an additional internal resistance measuring device; the internal resistance value can also be calculated based on the measured data of the battery state change, for example, an equation is established according to the temperature rise data of the battery, the original internal resistance value and the like to solve, and the actual internal resistance value is obtained; and then, or look up a table according to a preset relationship between the battery state change and the internal resistance, for example, a corresponding relationship between the temperature rise data and the internal resistance value of the battery is established in advance, and the internal resistance value corresponding to the current temperature rise data is looked up as the actual internal resistance value in the current charging stage, and the like, which is not specifically limited by the disclosure.
In step S320, the cut-off voltage in the current charging stage is updated according to the reference internal resistance value and the actual internal resistance value of the battery.
The reference internal resistance value refers to a battery internal resistance value relative to an actual internal resistance value in a certain charging stage before a current charging stage. In this exemplary embodiment, the reference internal resistance value may refer to a factory internal resistance value of the battery, that is, an initial internal resistance value of a new battery, for example, the internal resistance value of a new battery when the new battery leaves a factory is 30m Ω, after N times of charge and discharge processes, the internal resistance of the battery is increased to 60m Ω, where 30m Ω may be used as the reference internal resistance value, and 60m Ω is an actual internal resistance value in the current charging stage; the reference internal resistance value may also be an actual internal resistance value of the battery determined last time in the current charging stage, that is, an internal resistance value at a certain time before the current charging stage, for example, the internal resistance value of the new battery is 30M Ω, after M times of charging and discharging processes, the internal resistance of the battery is increased to 35M Ω, and after K times of charging and discharging processes, the internal resistance value of the battery is increased to 60M Ω, where 35M Ω determined after M times of charging and discharging processes may also be used as a reference internal resistance value after K times of charging and discharging processes, and 60M Ω is an actual internal resistance value in the current charging stage after K times of charging and discharging processes, that is, the reference internal resistance value refers to a variable internal resistance value relative to the actual internal resistance value in the current charging stage, and the actual internal resistance value determined last time may also be changed into the reference internal resistance value along with the change in the current charging stage.
The cut-off voltage is the voltage which is not reduced continuously when the voltage of the battery is reduced to a certain specific working voltage value in the charging process. The cutoff voltage varies depending on the type of battery and the charging and discharging conditions. In general, the cutoff voltage may be determined according to the performance of a new battery when shipped from a factory. For example, when the CCCV charging method is used for charging, a constant current charging process is performed by using 3A, and when the charging voltage changes to 4.2V, a constant voltage charging process is performed by using 4.2V until the charging voltage is full, wherein 4.2V is the cut-off voltage.
Considering that the overall charging time is increased if the initial cut-off voltage is still used for the charging process after the internal resistance of the battery is increased, based on this, the present exemplary embodiment may determine a new cut-off voltage according to the reference internal resistance value and the actual internal resistance value, so as to update the cut-off voltage in the current charging stage, thereby adapting to the current charging state and maintaining a higher charging efficiency. Specifically, the present exemplary embodiment may perform a calculation according to a specific formula to determine the cutoff voltage of the current charging phase.
In an exemplary embodiment, the cut-off voltage of the current charging phase before updating is the cut-off voltage corresponding to the reference internal resistance value. For example, a battery internal resistance value of 50m Ω in a certain charging stage is used as a reference internal resistance value, and a corresponding cut-off voltage is 3.8V, that is, the current charging strategy is adjusted according to 3.8V, after N times of charging and discharging processes are performed, the internal resistance of the battery is increased to 60m Ω, at this time, a new cut-off voltage of 3.84V can be determined according to the current actual internal resistance value and the reference internal resistance value, the cut-off voltage is updated from 3.8V to 3.84V, the charging strategy needs to be adjusted according to the updated 3.84V, and a constant voltage charging process is performed when the charging voltage reaches 3.84V. It should be noted that, if the current charging stage before updating is the initial charging stage, for example, the battery starts to be charged immediately after leaving the factory, the reference internal resistance value is the factory internal resistance value of the battery, and the corresponding cut-off voltage is the initial cut-off voltage that is not updated, so that the cut-off voltage before updating is the initial cut-off voltage.
In step S330, when the voltage of the battery reaches the cut-off voltage, it is determined to enter the next charging stage.
The present exemplary embodiment updates the cut-off voltage, so that when the battery is charged and the charging voltage reaches the updated cut-off voltage, it is determined to enter the next charging phase, for example, in the CCCV charging mode, the current charging phase is a constant current charging phase, and the next charging phase is a constant voltage charging phase, and when the battery is charged in the constant current charging phase and the voltage reaches the updated cut-off voltage, it is determined to enter the constant voltage charging phase; or in the segmented constant current charging mode, the current charging stage is the ith constant current charging stage, if the current constant current charging stage is adopted, the next charging stage is the (i + 1) th constant current charging stage, if the current constant current charging stage is adopted, and if the voltage reaches the updated cut-off voltage when the battery is charged in the ith constant current charging stage, the current is adjusted, and the (i + 1) th constant current charging stage is entered. The present exemplary embodiment can realize adjustment of the charging time in the current charging stage by updating the cutoff voltage, thereby improving the efficiency of the overall charging.
It should be noted that, when the segmented constant current charging mode is adopted, only the cut-off voltage of the next segment of constant current charging can be updated, and the next segment of constant current charging process is started with the cut-off voltage. For example, in the first constant current charging stage, the battery is first subjected to constant current charging from 3.4V to 3.8V with a current of 4A, in the second constant current charging stage, the battery is then subjected to constant current charging from 3A to 4V, and the internal resistance of the battery is increased from 50m Ω to 60m Ω after 100 charge-discharge cycles.
In summary, in the present exemplary embodiment, the actual internal resistance value of the battery during the current charging phase is determined; updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; when the voltage of the battery reaches the cutoff voltage, it is determined that the next charge phase is entered. On one hand, the present exemplary embodiment provides a new charging control method, considering that the internal resistance of the battery may change during the charging process, the cut-off voltage is updated based on the actual internal resistance value and the reference internal resistance value, so that the charging strategy of the battery can be adaptively adjusted in time according to the change of the internal resistance of the battery, and the method has higher flexibility; on the other hand, when the internal resistance of the battery increases, floating voltage is often generated, and the overall charging time is prolonged, the cut-off voltage can be updated through internal resistance change, and the generated floating voltage is compensated by the updated cut-off voltage, so that the battery can be rapidly and accurately charged, and the battery has high charging efficiency; on the other hand, the charging control method of the exemplary embodiment has a simple flow and low hardware cost, can well control the charging process of the battery, and has a wide application range.
In an exemplary embodiment, the step S310 may include:
and determining the actual internal resistance value according to the temperature change value of the battery in the current charging stage.
In practice, the change of the internal resistance of the battery has a certain correlation with the change of the temperature of the battery, for example, a new battery is charged and the voltage V is changed1Charging to a voltage V2During this charging phase, the temperature variation value is Δ T1When the battery is charged and discharged N times in a circulating way, the voltage V is changed again1Charging to a voltage V2The temperature variation value of the battery is increased to delta T2. Based on this, the present exemplary embodiment can determine the actual internal resistance value from the temperature change value of the battery in the current charging phase. Specifically, the actual internal resistance value may be determined in various manners, for example, a relation mapping table between different temperature variation values and the internal resistance value of the battery may be pre-established, and according to the current temperature variation value,a look-up table may determine the corresponding internal resistance value.
In an exemplary embodiment, the determining the actual internal resistance value according to the temperature variation value of the battery in the current charging period may include:
determining an actual internal resistance value according to a temperature change value of the battery from a first reference voltage to a second reference voltage in a current charging stage;
the first reference voltage is an initial voltage of a current charging stage, and the second reference voltage is a cut-off voltage of the current charging stage.
In order to accurately determine the actual internal resistance value of the battery in the current charging phase, the present exemplary embodiment may determine the actual internal resistance value according to the temperature variation value in a certain voltage variation interval. The first reference voltage and the second reference voltage are two endpoints of voltage change in the current charging process. Specifically, the first reference voltage may be a starting voltage of the current charging phase, and the second reference voltage may be a cut-off voltage of the current charging phase, for example, in the CCCV charging mode, immediately after the constant current charging is started to a voltage of 4.2V with a current of 4A, the constant voltage charging is performed by skipping to a current of 3A, wherein the first reference voltage is the starting voltage of the constant current charging phase, and the second reference voltage is the cut-off voltage of 4.2V at the end of the constant current charging phase. In addition, the voltage variation interval may also be any sub-interval between the starting voltage and the cut-off voltage, that is, the first reference voltage may be greater than the starting voltage, the second reference voltage may be less than the cut-off voltage, and the like, as long as the actual internal resistance value is determined by using the temperature variation value of a certain fixed voltage variation sub-interval.
In an exemplary embodiment, as shown in fig. 4, the above determining the actual internal resistance value according to the temperature variation value of the battery in the current charging phase may include the following steps:
step S410, determining a first heat value generated by the battery in the current charging stage according to the specific heat capacity, the mass and the temperature change value of the battery;
step S420, establishing a heat conservation equation based on conservation of the first heat value and a second heat value generated by an actual internal resistance value;
and step S430, solving a heat conservation equation to obtain an actual internal resistance value.
The first calorific value refers to a calorific value generated by internal resistance of the battery due to temperature change, and the second calorific value refers to a calorific value generated when current passes through the internal resistance of the battery.
It should be noted that, the actual internal resistance value is determined according to the current charging phase, and when the current charging phase changes, the actual internal resistance value may also change accordingly, for example, the actual internal resistance value when a new battery leaves the factory is different from the actual internal resistance value of the battery after N times of charging and discharging, that is, the temperature change value and the internal resistance value of the battery may both change in different usage phases, but the present exemplary embodiment may determine the actual internal resistance value in different current charging phases according to different temperature change values, for example, the actual internal resistance value before N times of charging and discharging and the actual internal resistance value after N times of charging and discharging may both be determined by a heat conservation equation.
In the present exemplary embodiment, the first calorific value may be calculated from the specific heat capacity, mass, and temperature change value of the battery.
The temperature change value is change data of temperature rise of the battery in a charging process, the specific heat capacity of the battery is heat required by the battery with unit mass for rising a certain temperature, the battery with the mass M can be determined according to the specific heat capacity, the mass and the temperature change value of the battery, and the heat generated when the temperature rises to the temperature change value delta T is a first heat value.
In an exemplary embodiment, the step S430 may include:
and solving a heat conservation equation through the charging current and the charging time in the current charging stage to obtain the actual internal resistance value.
In the present exemplary embodiment, the first calorific value may be represented by the formula: q1CM Δ T, where C is the specific heat capacity of the battery and M is the mass of the batteryThe quantity, Δ T, is the value of the temperature change. The second calorific value may be represented by the formula: q2＝I2Rt, where I is the current flowing through the internal resistance of the battery, R is the actual internal resistance value of the battery, and t is the charging time, e.g., the charging voltage, from a first voltage value V1To a second voltage value V2The time used.
Based on the first and second heat values, the following heat conservation equations may be established:
CM△T＝I2Rt
the solution of the above equation can be obtained,
the present exemplary embodiment may determine the actual internal resistance value of the battery by monitoring the temperature change value within the corresponding voltage change interval in real time.
It should be noted that, when the reference internal resistance value is not the initial internal resistance value of the new battery when the new battery leaves the factory, for example, after a period of time, the reference internal resistance value can also be calculated by the above formula.
In an exemplary embodiment, a temperature measuring device may be disposed on a surface of the battery cell, and the temperature measuring device is configured to monitor a temperature of the battery to obtain a temperature change value.
The temperature measuring device may include a thermistor, a thermocouple, and the like, and may monitor the surface temperature of the battery in real time.
In an exemplary embodiment, as shown in fig. 5, the step S320 may include the following steps:
step S510, calculating an internal resistance increment value according to the reference internal resistance value and the actual internal resistance value;
step S520, calculating a cut-off voltage increment value according to the internal resistance value increment and the charging current in the current charging stage;
in step S530, the cutoff voltage is updated with the cutoff voltage increment value.
Internal resistance incremental value, i.e. difference between reference internal resistance value and actual internal resistance valueFor example, according to the heat conservation equation, the reference internal resistance value of the battery in the charging stage when the first voltage value changes to the second voltage value is calculated as follows:
after N charge-discharge cycles, the actual internal resistance value of the current charging phase, which changes from the first voltage value to the second voltage value, is:
the increment value of the internal resistance is R2-R1. The cutoff voltage increment value is a voltage change value that increases due to an increase in internal resistance when current passes through the internal resistance of the battery, and may be represented as I (R)2-R1)。
The updated cutoff voltage may be represented by the formula: vt’＝Vt+I*(R2-R1) And (c) represents. Wherein, VtRefers to the cut-off voltage before the cut-off voltage is not updated, I (R)2-R1) Is referred to as the cut-off voltage increment value, Vt' denotes the updated cutoff voltage.
In an exemplary embodiment, when updating the cutoff voltage of the current charging phase, the method further comprises:
and if the cutoff voltage after updating exceeds the maximum cutoff voltage which can be borne by the battery, adopting the maximum cutoff voltage which can be borne by the battery as the cutoff voltage.
That is, in the present exemplary embodiment, the updated cut-off voltage cannot exceed the maximum charging voltage that can be borne by the current battery, for example, the maximum charging voltage of a certain battery is 4.5V, and when the updated cut-off voltage is greater than 4.5V, 4.5V is used as the cut-off voltage.
In addition, in practical applications, the floating voltage may increase after the battery ages, which may make it difficult to fully charge the battery, for example, the cut-off voltage is 4.5V, and when the battery is charged at the cut-off voltage of 4.5V after the floating voltage of the battery increases, the battery may not be fully charged. Therefore, the present exemplary embodiment may set the updated cut-off voltage as the sum of the maximum cut-off voltage that the battery can bear and the preset float voltage increment, for example, the maximum cut-off voltage is 4.5V, and the preset float voltage increment is 0.05V, and then the updated cut-off voltage is 4.55V, based on which, the effective charging of the battery may be ensured. The preset floating pressure increment may be determined according to characteristics of the battery itself, such as a material of the battery, a service time of the battery, or a change condition of an electrolyte inside the battery, which is not specifically limited in this disclosure.
Exemplary embodiments of the present disclosure also provide a charge control device. As shown in fig. 6, the charge control device 600 may include: an actual internal resistance value determining module 610, configured to determine an actual internal resistance value of the battery in the current charging phase; a cut-off voltage updating module 620, configured to update the cut-off voltage in the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery; a charging phase determination module 630, configured to determine to enter a next charging phase when the voltage of the battery reaches the cut-off voltage.
In an exemplary embodiment, the actual internal resistance value determining module includes: and the actual internal resistance value determining unit is used for determining the actual internal resistance value according to the temperature change value of the battery in the current charging stage.
In an exemplary embodiment, the actual internal resistance value determining unit is configured to determine the actual internal resistance value according to a temperature change value of the battery changing from a first reference voltage to a second reference voltage in a current charging phase; the first reference voltage is an initial voltage of a current charging stage, and the second reference voltage is a cut-off voltage of the current charging stage.
In an exemplary embodiment, the actual internal resistance value determining unit includes: the first heat value determining subunit is used for determining a first heat value generated by the battery in the current charging stage according to the specific heat capacity, the mass and the temperature change value of the battery; the conservation equation establishing subunit is used for establishing a heat conservation equation based on conservation of the first heat value and a second heat value generated by the actual internal resistance value; and the equation solving subunit is used for solving the heat conservation equation to obtain the actual internal resistance value.
In an exemplary embodiment, the equation solving subunit is configured to solve the heat conservation equation by the charging current and the charging time of the current charging phase to obtain the actual internal resistance value.
In an exemplary embodiment, a temperature measuring device is disposed on a surface of a battery cell, and the temperature measuring device is configured to monitor a temperature of the battery to obtain a temperature change value.
In an exemplary embodiment, the cutoff voltage update module includes: an internal resistance incremental value determining unit for calculating an internal resistance incremental value according to the reference internal resistance value and the actual internal resistance value; the cutoff voltage increment value determining unit is used for calculating a cutoff voltage increment value according to the internal resistance value increment and the charging current in the current charging stage; an off-voltage updating unit for updating the off-voltage with the off-voltage increment value.
In an exemplary embodiment, the charge control device further includes: and the cut-off voltage judging module is used for adopting the maximum cut-off voltage which can be born by the battery as the cut-off voltage if the cut-off voltage after updating exceeds the maximum cut-off voltage which can be born by the battery when updating the cut-off voltage in the current charging stage.
In an exemplary embodiment, the reference internal resistance value is an actual internal resistance value of the battery in the current charging phase determined last time, or a factory internal resistance value of the battery.
In an exemplary embodiment, the cut-off voltage of the current charging phase before updating is the cut-off voltage corresponding to the reference internal resistance value.
In an exemplary embodiment, the current charging phase is a constant current charging phase, and the next charging phase is a constant voltage charging phase; the current charging stage is the ith constant current charging stage, and the next charging stage is the i +1 constant current charging stage.
The specific details of each part in the above device have been described in detail in the method part embodiments, and thus are not described again.
Exemplary embodiments of the present disclosure also provide a computer-readable storage medium, which may be implemented in the form of a program product, including program code, for causing a terminal device to perform the steps according to various exemplary embodiments of the present disclosure described in the above-mentioned "exemplary method" section of this specification, when the program product is run on the terminal device, for example, any one or more of the steps in fig. 3, fig. 4 or fig. 5 may be performed. The program product may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory, a Read Only Memory (ROM), an erasable programmable read only memory (EPROM or flash memory), an optical fiber, a portable compact disc read only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
As will be appreciated by one skilled in the art, aspects of the present disclosure may be embodied as a system, method or program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the following claims.
Claims (14)
1. A charge control method, comprising:
determining the actual internal resistance value of the battery in the current charging stage;
updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery;
determining to enter a next charging phase when the voltage of the battery reaches the cutoff voltage.
2. The method of claim 1, wherein determining the actual internal resistance value of the battery during the current charging phase comprises:
and determining the actual internal resistance value according to the temperature change value of the battery in the current charging stage.
3. The method of claim 2, wherein said determining the actual internal resistance value based on a temperature change value of the battery during the current charging phase comprises:
determining the actual internal resistance value according to a temperature change value of the battery changing from a first reference voltage to a second reference voltage in the current charging stage;
the first reference voltage is a starting voltage of the current charging phase, and the second reference voltage is a cut-off voltage of the current charging phase.
4. The method of claim 2, wherein said determining the actual internal resistance value based on a temperature change value of the battery during the current charging phase comprises:
determining a first heat value generated by the battery in the current charging stage according to the specific heat capacity, the mass and the temperature change value of the battery;
establishing a heat conservation equation based on conservation of the first heat value and a second heat value generated by the actual internal resistance value;
and solving the heat conservation equation to obtain the actual internal resistance value.
5. The method of claim 4, wherein solving the heat conservation equation to obtain the actual internal resistance value comprises:
and solving the heat conservation equation through the charging current and the charging time of the current charging stage to obtain the actual internal resistance value.
6. The method of claim 2, wherein a temperature measuring device is disposed on a surface of the battery cell, and the temperature measuring device is configured to monitor a temperature of the battery to obtain the temperature variation value.
7. The method of claim 1, wherein updating the cutoff voltage of the current charging phase based on the reference internal resistance value and the actual internal resistance value of the battery comprises:
calculating an internal resistance increment value according to the reference internal resistance value and the actual internal resistance value;
calculating a cut-off voltage increment value according to the internal resistance value increment and the charging current of the current charging stage;
updating the cutoff voltage with the cutoff voltage increment value.
8. The method of claim 1, wherein in updating the cutoff voltage of the current charging phase, the method further comprises:
and if the updated cut-off voltage exceeds the maximum cut-off voltage which can be borne by the battery, adopting the maximum cut-off voltage which can be borne by the battery as the cut-off voltage.
9. The method according to any one of claims 1 to 8, wherein the reference internal resistance value is an actual internal resistance value of the battery in the current charging phase determined last time, or a factory internal resistance value of the battery.
10. The method according to any one of claims 1 to 8, wherein the cut-off voltage of the current charging phase before updating is a cut-off voltage corresponding to the reference internal resistance value.
11. The method according to any one of claims 1 to 8, wherein the current charging phase is a constant current charging phase and the next charging phase is a constant voltage charging phase; the current charging stage is the ith constant current charging stage, and the next charging stage is the i +1 constant current charging stage.
12. A charge control device, characterized by comprising:
the actual internal resistance value determining module is used for determining the actual internal resistance value of the battery in the current charging stage;
the cut-off voltage updating module is used for updating the cut-off voltage of the current charging stage according to the reference internal resistance value and the actual internal resistance value of the battery;
a charging phase determination module for determining to enter a next charging phase when the voltage of the battery reaches the cutoff voltage.
13. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 11.
14. An electronic device, comprising:
a processor;
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the method of any of claims 1 to 11 via execution of the executable instructions.
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