Charging and discharging control method and device, and scalable power supply

Abstract

The application relates to the battery technical field and discloses a charging and discharging control method applied to an extensible power supply, wherein the extensible power supply has a main battery and an extension battery in parallel; the method comprises the following steps: detecting the discharging condition between the main battery and the extension battery in a battery pack; the discharging condition is used for representing the number of times that the main battery charges the extension battery and the number of times that the extension battery charges the main battery; determining the replacement priority between the main battery and the extension battery according to the discharging condition; determining the charging and discharging control logic of the main battery and the extension battery according to the replacement priority; and controlling the charging and discharging of the main battery and the extension battery according to the charging and discharging control logic. The technical effect of the method is explained. The application further discloses a charging and discharging control device and an extensible power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a charging and discharging control method and device, and an extendable power supply. BACKGROUND

[0002] Now more and more electric devices can support the extendable power supply. The electric devices will have a main battery when they are shipped, and users can incorporate additional extension batteries to meet the use requirements.

[0003] There is often a voltage imbalance phenomenon between the main battery and the extension battery. The voltage imbalance will affect the overall performance of the battery pack, so it needs to be balanced.

[0004] In a parallel group, all batteries share the same voltage. If one battery is severely aged (high internal resistance, low capacity), when the system needs a large current, this aged battery cannot provide enough current due to high internal resistance, or its voltage will drop faster. In order to maintain the system voltage, other newer batteries with low internal resistance must provide more current to compensate. This causes the new batteries to be in an overloading state for a long time, accelerating their aging and shortening their expected longer life.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important components or to delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0007] The charging and discharging control method and device, and the extendable power supply provided by the embodiments of the present application can provide a charging and discharging control strategy that can guarantee the service life of the main battery or the extension battery in the extendable power supply according to the requirements.

[0008] In some embodiments, the charging and discharging control method is applied to an extendable power supply having a main battery and an extension battery in parallel; the method comprises: detecting the discharging condition between the main battery and the extension battery in the battery pack; the discharging condition is used to represent the number of times that the main battery charges the extension battery and the number of times that the extension battery charges the main battery; determining the replacement priority between the main battery and the extension battery according to the discharging condition; determining the charging and discharging control logic of the main battery and the extension battery according to the replacement priority; and controlling the charging and discharging of the main battery and the extension battery according to the charging and discharging control logic.

[0009] In some embodiments, the charge-discharge control device is applied to an extensible power supply having a main battery and an extension battery connected in parallel; the device comprises: a detection module configured to detect a discharge condition between the main battery and the extension battery in a battery pack; the discharge condition is used to represent a number of times that the main battery charges the extension battery and a number of times that the extension battery charges the main battery; a replacement priority determination module configured to determine a replacement priority between the main battery and the extension battery according to the discharge condition; a charge-discharge control logic determination module configured to determine a charge-discharge control logic of the main battery and the extension battery according to the replacement priority; and a charge-discharge control module configured to control the main battery and the extension battery according to the charge-discharge control logic.

[0010] In some embodiments, the charge-discharge control device comprises a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned charge-discharge control method when running the program instructions.

[0011] In some embodiments, the extensible power supply comprises a main battery and an extension battery connected in parallel, and further comprises a power management system, and the power management system executes the above-mentioned charge-discharge control method.

[0012] The charge-discharge control method and device and the extensible power supply provided by the embodiments of the present disclosure can achieve the following technical effects:

[0013] By detecting the discharge condition between the main battery and the extension battery in the battery pack, it is determined who replaces first between the main battery and the extension battery, so as to prolong the service life of the main battery or the extension battery in the extensible power supply according to the requirement, and finally the charge-discharge control logic of the main battery and the extension battery is determined according to the replacement priority, and the main battery and the extension battery are controlled according to the charge-discharge control logic, so as to ensure that the service life of the main battery or the extension battery in the extensible power supply is longer as much as possible during charging and discharging.

[0014] The general description above and the following description below are exemplary and explanatory only and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0015] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the application. Identical reference numbers in different figures identify identical, functionally similar, and / or structurally similar elements. Dimensions of elements in the figures can be chosen to be too large for the clarity of illustration. In the figures:

[0016] Figure 1 A schematic diagram of a charge-discharge control method provided by the embodiments of the present disclosure;

[0017] Figure 2is a schematic diagram of a charge and discharge control device provided by an embodiment of the present disclosure.

[0018] Figure 3 is a schematic diagram of another charge and discharge control device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0020] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0021] Unless otherwise specified, the term "a plurality of" means two or more.

[0022] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B represents: A or B.

[0023] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0024] The term "corresponding" can refer to an association or binding relationship. A and B correspond to each other means that there is an association or binding relationship between A and B.

[0025] In combination Figure 1 As shown, the embodiments of the present disclosure provide a charge and discharge control method applied to an extensible power supply having a main battery and an extension battery in parallel. The method comprises:

[0026] Step S101, detecting the discharge condition between the main battery and the extension battery in the battery pack. The discharge condition is used to represent the number of times the main battery charges the extension battery, and the number of times the extension battery charges the main battery.

[0027] Step S102, determining the replacement priority between the main battery and the extension battery according to the discharge condition.

[0028] In step S103, the charge-discharge control logic of the main battery and the extended battery is determined according to the replacement priority.

[0029] In step S104, the main battery and the extended battery are controlled to charge and discharge according to the charge-discharge control logic.

[0030] By using the charge-discharge control method provided by the embodiments of the present disclosure, the discharging condition between the main battery and the extended battery in the battery pack is detected, and then it is determined who replaces the main battery and the extended battery first. In this way, the service life of the main battery or the extended battery in the extended power supply can be extended according to the demand. Finally, the charge-discharge control logic of the main battery and the extended battery is determined according to the replacement priority, and the main battery and the extended battery are controlled to charge and discharge according to the charge-discharge control logic. Thus, the service life of the main battery or the extended battery in the extended power supply can be ensured to be longer as much as possible during charging and discharging according to the demand.

[0031] In some embodiments, the main battery and the extended battery in the extended power supply are equipped with independent charging and discharging circuits, and each charging and discharging circuit is isolated from each other.

[0032] Further, the replacement priority between the main battery and the extended battery is determined according to the discharging condition, including:

[0033] In a case where the number of times that the main battery charges the extended battery is greater than the number of times that the extended battery charges the main battery in a preset time period, and the number of times that the main battery charges the extended battery reaches a preset first threshold, it is determined that the extended battery is replaced before the main battery. Or, in a case where the number of times that the main battery charges the extended battery is less than the number of times that the extended battery charges the main battery in a preset time period, and the number of times that the extended battery charges the main battery reaches a preset second threshold, it is determined that the main battery is replaced before the extended battery. Otherwise, the replacement priority between the main battery and the extended battery is the same. It is determined that the extended battery is replaced before the main battery, that is, the replacement priority of the extended battery is higher than that of the main battery. It is determined that the main battery is replaced before the extended battery, that is, the replacement priority of the extended battery is lower than that of the main battery.

[0034] The essence of balancing is to supplement the energy to the low-voltage end, and the aging battery has lower voltage at the same SOC due to capacity attenuation and internal resistance increase, becoming the "short board" of the system. If a certain battery A frequently charges battery B, it is very likely that battery B has capacity attenuation / internal resistance increase, and the service life of battery B is likely to be shorter, and the probability of being replaced is greater. If battery B continuously receives charging, it is very likely that the actual SOC of battery B is lower than the display value, which may be caused by the distortion of the voltage-SOC curve due to aging. Through the above method, it can be determined whether the main battery needs to be replaced more or the extended battery needs to be replaced more according to the balancing charging condition between the main battery and the extended battery in the extended power supply.

[0035] Further, the charging and discharging control logic of the main battery and the extension battery according to the replacement priority includes:

[0036] In the case of replacing the main battery first, it is determined that the charging priority of the main battery is lower than that of the extension battery, and the discharging priority of the main battery is lower than that of the extension battery; or in the case of replacing the extension battery first, it is determined that the charging priority of the main battery is higher than that of the extension battery, and the discharging priority of the main battery is higher than that of the extension battery. The core purpose of the above scheme is to try to ensure that the main battery is used first in the extension power supply and the relatively faster aging one in the extension battery is used as much as possible, and the service life of the other relatively slow aging battery is longer during charging and discharging.

[0037] According to the replacement priority, it is determined who the main battery and the extension battery are to charge and discharge first, so as to control the cycle times of the main battery and the extension battery. The cycle times of the "main battery" and the "extension battery" refer to the number of complete charging and discharging cycles they have experienced. Cycle times are one of the most critical indicators of battery aging and life. As the cycle times increase, the maximum available capacity of the battery will gradually decrease. A new battery may have 100% capacity, but after many cycles, it may only have 80% or less capacity. At the same time, cycle aging will cause the chemical reaction activity inside the battery to decrease, and the resistance of ion and electron transmission to increase, resulting in an increase in internal resistance.

[0038] The life of a battery is usually defined as when its capacity decays to a certain percentage of the initial rated capacity, or the internal resistance increases to a certain threshold. The main reason for reaching this state is the cumulative cycle times. If the aging rates of the two batteries are not consistent, the one with faster capacity decay or internal resistance increase will become the "short board" of the system. The battery with greater internal resistance will drop in voltage faster during discharging, which will limit the total energy that can be released by the system, because even if the other battery still has power, the system voltage may be cut off prematurely due to the short board battery voltage being too low. At the same time, the battery with smaller internal resistance will carry more current, accelerating its aging.

[0039] In a parallel battery system, the core advantage of identifying, prioritizing and replacing the oldest "weakest link" battery in the extended power supply is to protect new batteries from the drag of old batteries, thereby maximizing the performance and life of new batteries and improving the overall reliability and safety of the system. Essentially, it is a strategy to avoid the "bad money drives out good money". For the battery with high replacement priority, it can be determined to be charged and discharged first, so that its cycle number can be controlled to be higher and it can age faster. Although it ages faster, the battery of the device manufacturer is usually the main battery, and its price is usually higher. Therefore, this solution is convenient for users to prefer to use one battery in the extended power supply to the extreme and then replace it, and to extend the service life of other batteries as much as possible in the process.

[0040] Further, the charging and discharging control logic of the main battery and the extended battery according to the replacement priority includes: in the case of replacing the extended battery first, voltage detection is performed on the main battery and the extended battery in the charging state, and when it is detected that the voltage of the extended battery reaches a preset third threshold value, the charging current is reduced; or, in the case of replacing the main battery first, voltage detection is performed on the main battery and the extended battery in the charging state, and when it is detected that the voltage of the main battery reaches a preset fourth threshold value, the charging current is reduced. In some embodiments, reducing the charging current is to reduce the overall charging current, or to reduce the charging current of the battery with low replacement priority.

[0041] The internal resistance of the aged battery is large, and its terminal voltage rises faster during charging. If only the total voltage or average voltage is monitored, when the aged battery reaches the charging cutoff voltage, the healthy battery may still be far from being fully charged. At this time, the charging is stopped, causing the healthy battery to be in an undercharged state for a long time, accelerating its capacity decay (especially the risk of lithium precipitation on the negative electrode). In some embodiments, the third threshold value is lower than the preset cutoff voltage value. When the voltage of the battery with high replacement priority reaches the third threshold value, reducing the charging current can reduce the pressure on the aged battery, while allowing the battery with lower replacement priority to continue charging: when charging with small current, the voltage drop caused by the internal resistance of the aged battery is reduced, and the voltage rises slowly, avoiding reaching the cutoff voltage too early. After reducing the current, the voltage of the battery with higher replacement priority rises slowly, and the system can continue to charge with small current for a long time to allow the healthy battery to approach full charge. In this way, by sacrificing a little charging speed, the battery with lower replacement priority is allowed to reach a higher state of charge as much as possible, avoiding long-term undercharging.

[0042] Further, the charge-discharge control logic of the main battery and the extension battery according to the replacement priority includes: in the case that the extension battery is replaced in priority to the main battery, voltage detection is performed on the main battery and the extension battery in a discharging state, and when it is detected that the voltage of the extension battery drops to a preset first discharging cutoff voltage, the extendable power supply is controlled to stop discharging; or, in the case that the main battery is replaced in priority to the extension battery, voltage detection is performed on the main battery and the extension battery in a discharging state, and when it is detected that the voltage of the main battery drops to a preset second discharging cutoff voltage, the extendable power supply is controlled to stop discharging. In this way, the battery with higher replacement priority can be protected from over-discharging.

[0043] Further, after the replacement priority between the main battery and the extension battery is determined according to the discharging condition, the method further includes: in the case that the replacement priority between the main battery and the extension battery is different, reducing the maximum discharging current of the extendable power supply during discharging.

[0044] The battery with lower replacement priority is likely to be a battery with small internal resistance. In a parallel system, a healthy battery with small internal resistance will try to output more current. Large-current discharging will significantly accelerate the capacity decay and aging of the battery with lower replacement priority. Limiting the total current can directly reduce the current stress on the battery with lower replacement priority. The battery with higher replacement priority will have a more severe voltage drop under large current, which is more likely to trigger over-discharge protection, and large current will accelerate its degradation and increase the risk of thermal runaway. Once it is determined that the replacement priority between the main battery and the extension battery is different, it means that one of the main battery or the extension battery is relatively healthier, and one of the internal resistances is low while the other is high. Actively limiting the maximum allowed discharging current of the entire extendable power supply reduces the discharging current of the extendable power supply during discharging, which can prevent the battery with higher replacement priority from over-discharging. At the same time, the above scheme can protect the battery with lower replacement priority from excessive current stress and temperature rise by limiting the current, and indirectly achieve shallow discharging of the battery with lower replacement priority, which is beneficial to its service life.

[0045] Further, the replacement priority between the main battery and the extension battery is determined according to the discharging condition, including:

[0046] According to the discharging condition between the main battery and the extension battery, it is determined whether the extendable power supply can meet the demand in a single-battery power supply mode within a preset time period;

[0047] In the case that the extendable power supply can meet the demand in a single-battery power supply mode within a preset time period, the replacement priority between the main battery and the extension battery is determined.

[0048] In the case that the single-cell power supply can meet the demand, the replacement priority between the main battery and the extended battery is determined according to the discharging condition, and the charging and discharging control logic of the main battery and the extended battery is determined according to the replacement priority, so as to control the charging and discharging of the main battery and the extended battery according to the charging and discharging control logic. In this case, the single-cell power supply is preferentially performed on the battery with high replacement priority, thereby reducing the influence on the battery with low replacement priority.

[0049] Further, whether the single-cell power supply of the expandable power supply can meet the demand in a preset time period is determined according to the discharging condition between the main battery and the extended battery, including:

[0050] The remaining power of the main battery and the extended battery is respectively corrected according to the discharging condition between the main battery and the extended battery, so as to obtain the predicted power supply of the main battery and the predicted power supply of the extended battery.

[0051] The time period of charging the extended battery by the main battery is obtained, and the time period of charging the main battery by the extended battery is obtained.

[0052] The hotspot balance time period is determined by using the time period of charging the extended battery by the main battery and the time period of charging the main battery by the extended battery; the hotspot balance time period is used to represent a time period between two time points in a day.

[0053] The power supply corresponding to the hotspot balance time period is obtained.

[0054] It is judged whether the current time is located in the hotspot balance time period; in the case that the current time is located in the hotspot balance time period, the predicted power consumption corresponding to the current time is obtained; wherein the predicted power consumption corresponding to the current time is obtained by determining the power supply corresponding to the hotspot balance time period corresponding to the current time as the predicted power consumption corresponding to the current time; in the case that the current time is not located in the hotspot balance time period, a preset power consumption value is determined as the predicted power consumption corresponding to the current time. The load in the non-hotspot balance time period is usually stable, and there is no need for complex calculation, and the charging and discharging behavior is usually sparse, and there is lack of sufficient data to support fine prediction, so the preset power consumption is used as the predicted power consumption.

[0055] Generally, in some embodiments, the preset power consumption is a fixed empirical value. For example, the average power consumption in a certain time period. Since different users have different usage habits, the conditions of the main battery and the extended battery are also different. Such a fixed empirical value often deviates greatly from the actual situation, resulting in inaccurate power consumption estimation and deviation in the decision of whether to perform single-cell power supply on the main battery and the extended battery, affecting the service life of the battery with lower replacement priority, and even possibly affecting the normal use of the expandable power supply. Therefore, in other embodiments, the preset power consumption value can be determined by the following method:

[0056] obtaining a charging efficiency and a discharging efficiency, wherein the charging efficiency is an actual energy received by the extended battery when the main battery charges the extended battery divided by an energy released by the main battery, multiplied by 100%. The discharging efficiency is an actual energy received by the main battery when the extended battery discharges the main battery divided by an energy released by the extended battery, multiplied by 100%.

[0057] determining an arithmetic mean of the charging efficiency and the discharging efficiency as a real-time bidirectional efficiency. That is, η_real-time = (η_charge + η_discharge) / 2, wherein η_real-time is the real-time bidirectional efficiency, η_charge is the charging efficiency, and η_discharge is the discharging efficiency. In some embodiments, the arithmetic mean of the charging efficiency and the discharging efficiency is obtained for the last N active balancing charge-discharge events, N being a positive integer.

[0058] calculating η effective = η_real-time × (1 - α × Ncycle), to obtain a bidirectional comprehensive efficiency η effective . Wherein α is a preset battery aging attenuation rate, Ncycle is a cumulative equivalent cycle number. 0 < α < 0.003%, Ncycle is the number of times when the main battery charges the extended battery plus the number of times when the extended battery discharges the main battery.

[0059] obtaining an average power consumption in a non-hot balancing time period within a preset number of days.

[0060] calculating P preset = Cnom × η effective , to obtain a preset power consumption value, wherein P preset is the preset power consumption value, and Cnom is the average power consumption in the non-hot balancing time period within the preset number of days.

[0061] Even when the load is not powered, the main battery and the extended battery in the extended power supply will bring aging effect to the battery when actively balancing, which will cause the statistical deviation of the power consumption of the extended power supply from the true value by distorting the voltage-power relationship, thereby affecting the determination of the preset power consumption value, and further affecting the judgment of the current power supply capacity. The preset value is corrected through the interaction between the batteries, which is especially suitable for improving the prediction accuracy of the power consumption in the non-hot balancing time period for the extended power supply.

[0062] comparing the predicted power consumption corresponding to the current time with the main battery predicted power supply and the extended battery predicted power supply, respectively, and determining that the expandable power supply can meet the demand in the preset time period when the main battery predicted power supply is greater than the predicted power consumption, and the extended battery predicted power supply is greater than the predicted power consumption. Otherwise, it is determined that the expandable power supply cannot meet the demand in the preset time period when the main battery predicted power supply is less than the predicted power consumption, and the extended battery predicted power supply is less than the predicted power consumption.

[0063] The judgment of single-cell power supply feasibility is the key prerequisite of the strategy of prolonging the life of "healthy battery": if the system only needs a single cell to meet the load demand within a preset time period (i.e., the available capacity of the single cell ≥ total energy consumption), the other battery can be completely idle as a redundant backup. Under this condition, the system can actively select a battery (such as the main battery) to bear all discharge cycles, and then consider who is healthier and who is more aged between the main battery and the extended battery, so that it is meaningful to concentrate the use of a single battery, make it "preferentially wear out", and avoid the synchronous decay of life caused by the parallel aging of double batteries.

[0064] Among them, the remaining power of the main battery and the extended battery is corrected according to the discharge condition between the main battery and the extended battery to obtain the predicted power supply of the main battery and the predicted power supply of the extended battery, including:

[0065] The total number of equalizations is obtained by adding the number of times the main battery charges the extended battery to the number of times the extended battery charges the main battery.

[0066] The main battery power correction parameter is obtained by dividing the number of times the main battery charges the extended battery by the total number of equalizations, and the extended battery power correction parameter is obtained by dividing the number of times the extended battery charges the main battery by the total number of equalizations.

[0067] The remaining power of the main battery and the extended battery is obtained respectively.

[0068] The predicted power supply of the main battery is obtained by multiplying the remaining power of the main battery by the main battery power correction parameter, and the predicted power supply of the extended battery is obtained by multiplying the remaining power of the extended battery by the extended battery power correction parameter.

[0069] The above scheme converts the cooperation history of the battery pack into a correction factor for power prediction, takes into account the implicit loss measurement of the shared battery pack, and makes the power estimation more accurate, so that the "paper capacity" becomes "actual available amount".

[0070] Among them, the hot equalization time period is determined by using the time period of the main battery charging the extended battery and the time period of the extended battery charging the main battery, including: the time period that appears a number of times reaching a set number of times threshold in the time period of the main battery charging the extended battery and the time period of the extended battery charging the main battery is determined as the hot equalization time period.

[0071] The hot equalization time period corresponds to a power supply table. The power supply corresponding to the hot equalization time period is obtained by using the hot equalization time period to perform a table lookup operation on the power supply table. The power supply table stores the hot equalization time period and the corresponding power supply.

[0072] In combination with Figure 2As shown, the embodiment of the present disclosure provides a charge-discharge control device, which is applied to an extensible power supply. The extensible power supply has a main battery and an extension battery in parallel. The device includes a detection module 201, a replacement priority determination module 202, a charge-discharge control logic determination module 203 and a charge-discharge control module 204. The detection module 201 is configured to detect a discharge condition between the main battery and the extension battery in a battery pack. The discharge condition is used to represent the number of times that the main battery charges the extension battery, and the number of times that the extension battery charges the main battery. The replacement priority determination module 202 is configured to determine a replacement priority between the main battery and the extension battery according to the discharge condition. The charge-discharge control logic determination module 203 is configured to determine a charge-discharge control logic of the main battery and the extension battery according to the replacement priority. The charge-discharge control module 204 is configured to control the charge-discharge of the main battery and the extension battery according to the charge-discharge control logic.

[0073] By using the charge-discharge control device provided by the embodiment of the present disclosure, the discharge condition between the main battery and the extension battery in the battery pack is detected, and then it is determined which one of the main battery and the extension battery is replaced first. In this way, the service life of the main battery or the extension battery in the extensible power supply can be extended according to the requirement. Finally, the charge-discharge control logic of the main battery and the extension battery is determined according to the replacement priority, and the charge-discharge of the main battery and the extension battery is controlled according to the charge-discharge control logic. Thus, the service life of the main battery or the extension battery in the extensible power supply can be ensured to be longer as much as possible during the charge-discharge according to the requirement.

[0074] Optionally, the replacement priority determination module is configured to determine the replacement priority between the main battery and the extension battery according to the discharge condition in the following manner: in a case where the number of times that the main battery charges the extension battery is greater than the number of times that the extension battery charges the main battery within a preset time period, and the number of times that the main battery charges the extension battery reaches a preset first threshold, it is determined that the extension battery is replaced prior to the main battery; or in a case where the number of times that the main battery charges the extension battery is less than the number of times that the extension battery charges the main battery within the preset time period, and the number of times that the extension battery charges the main battery reaches a preset second threshold, it is determined that the main battery is replaced prior to the extension battery; otherwise, the replacement priority between the main battery and the extension battery is the same.

[0075] Optionally, the charge-discharge control logic determination module is configured to determine the charge-discharge control logic of the main battery and the extension battery according to the replacement priority in the following manner: in a case where the extension battery is replaced prior to the main battery, it is determined that the charging priority of the main battery is lower than the charging priority of the extension battery, and the discharging priority of the main battery is lower than the charging priority of the extension battery; or in a case where the main battery is replaced prior to the extension battery, it is determined that the charging priority of the main battery is higher than the charging priority of the extension battery, and the discharging priority of the main battery is higher than the charging priority of the extension battery.

[0076] Optionally, the charge-discharge control logic determination module is configured to determine the charge-discharge control logic of the main battery and the extension battery according to the replacement priority by: in the case of the extension battery replacing the main battery first, performing voltage detection on the main battery and the extension battery in the charging state, and reducing the charging current when detecting that the voltage of the extension battery reaches a preset third threshold; or, in the case of the main battery replacing the extension battery first, performing voltage detection on the main battery and the extension battery in the charging state, and reducing the charging current when detecting that the voltage of the main battery reaches a preset fourth threshold.

[0077] Optionally, the charge-discharge control logic determination module is configured to determine the charge-discharge control logic of the main battery and the extension battery according to the replacement priority by: in the case of the extension battery replacing the main battery first, performing voltage detection on the main battery and the extension battery in the discharging state, and controlling the extendable power supply to stop discharging when detecting that the voltage of the extension battery drops to a preset first discharging cutoff voltage; or, in the case of the main battery replacing the extension battery first, performing voltage detection on the main battery and the extension battery in the discharging state, and controlling the extendable power supply to stop discharging when detecting that the voltage of the main battery drops to a preset second discharging cutoff voltage.

[0078] Optionally, the replacement priority determination module is configured to determine the replacement priority between the main battery and the extension battery according to the discharging condition by: determining whether the extendable power supply can meet the demand in a preset time period by single battery power supply according to the discharging condition between the main battery and the extension battery; and determining the replacement priority between the main battery and the extension battery according to the discharging condition in the case that the extendable power supply can meet the demand in the preset time period by single battery power supply.

[0079] The charge-discharge control device further comprises a current control module configured to reduce the maximum discharging current of the extendable power supply during discharging in the case that the replacement priority between the main battery and the extension battery is different.

[0080] In combination with Figure 3 As shown in the figure, the embodiment of the present disclosure provides a charge-discharge control device 300, which comprises a processor 301 and a memory 302 storing program instructions. Optionally, the device can further comprise a communication interface 303 and a bus 304. The processor 301, the communication interface 303 and the memory 302 can complete mutual communication through the bus 304. The communication interface 303 can be used for information transmission. The processor 301 can invoke the program instructions in the memory 302 to execute the charge-discharge control method of the above-mentioned embodiments.

[0081] In addition, the logic instructions in the memory 302 described above can be implemented in the form of software function units and sold or used as independent products, and can be stored in a computer readable storage medium.

[0082] The memory 302 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present disclosure. The processor 301 executes the program instructions / modules stored in the memory 302, thereby performing function applications and data processing, that is, implementing the charge and discharge control method in the above embodiments.

[0083] The memory 302 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 302 can include a high-speed random access memory, and can also include a non-volatile memory.

[0084] The embodiments of the present disclosure provide an extendable power supply, which includes a main battery and an extension battery connected in parallel, and further includes a power management system, the power management system executes the charge and discharge control method described above.

[0085] The above description and drawings are illustrative of embodiments of the present disclosure and are not intended to be limiting. Other embodiments can include structural, logical, electrical, process, and other changes. Embodiments are merely representative of possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included in, or substituted for, those of other embodiments. Also, words used in this document and claims are words of description, not limitation. As used in the description and claims herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. Additionally, the term "comprises" and variations thereof do not exclude the presence of additional elements or steps. Where the indefinite article "a" or "an" is used, "a" or "an" is to be taken to cover the singular number as well as the plural number, unless the context clearly indicates otherwise. Corresponding elements in different embodiments can be referred to by the same reference numerals. For the embodiments of the methods, products, etc. disclosed, if they correspond to the embodiments of the methods disclosed, the relevant parts can be referred to the description of the methods.

[0086] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to realize the described functions, but such implementation should not be considered beyond the scope of the embodiments of the present disclosure. The skilled person can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0087] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the apparatus embodiments described above are merely schematic. For example, the division of the units is merely logical function division. There can be other division manners in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, apparatuses, or units, and can be in electrical, mechanical, or other forms. The units described as separated components can or can not be physically separated, and components displayed as units can or can not be physical units. Some or all of the units can be selected according to actual needs to achieve the embodiments.

[0088] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions, and operations of the systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions noted in the blocks can occur in different orders than those noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in different orders than those disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A charge-discharge control method applied to an extensible power supply having a main battery and an extension battery connected in parallel, characterized by, The method comprises: detecting the discharge condition between the main battery and the extended battery in the battery pack; the discharge condition is used to represent the number of times that the main battery charges the extended battery, and the number of times that the extended battery charges the main battery; determining the replacement priority between the main battery and the extended battery according to the discharge condition; determining the charge-discharge control logic of the main battery and the extended battery according to the replacement priority; controlling the charge-discharge of the main battery and the extended battery according to the charge-discharge control logic; wherein, the determination of the charge-discharge control logic of the main battery and the extended battery according to the replacement priority comprises: in the case that the extended battery is replaced before the main battery, determining that the charging priority of the main battery is lower than that of the extended battery, and the discharging priority of the main battery is lower than that of the extended battery; or, in the case that the main battery is replaced before the extended battery, determining that the charging priority of the main battery is higher than that of the extended battery, and the discharging priority of the main battery is higher than that of the extended battery; or, the determination of the charge-discharge control logic of the main battery and the extended battery according to the replacement priority comprises: in the case that the extended battery is replaced before the main battery, voltage detection is performed on the main battery and the extended battery in the charging state, and when it is detected that the voltage of the extended battery reaches a preset third threshold value, the charging current is reduced; or, in the case that the main battery is replaced before the extended battery, voltage detection is performed on the main battery and the extended battery in the charging state, and when it is detected that the voltage of the main battery reaches a preset fourth threshold value, the charging current is reduced; or, the determination of the charge-discharge control logic of the main battery and the extended battery according to the replacement priority comprises: in the case that the extended battery is replaced before the main battery, voltage detection is performed on the main battery and the extended battery in the discharging state, and when it is detected that the voltage of the extended battery drops to a preset first discharge cutoff voltage, the extendable power supply is controlled to stop discharging; or, in the case that the main battery is replaced before the extended battery, voltage detection is performed on the main battery and the extended battery in the discharging state, and when it is detected that the voltage of the main battery drops to a preset second discharge cutoff voltage, the extendable power supply is controlled to stop discharging.

2. The method of claim 1, wherein, The determination of the replacement priority between the main battery and the extended battery according to the discharge condition comprises: in the case that the number of times that the main battery charges the extended battery is greater than the number of times that the extended battery charges the main battery within a preset time period, and the number of times that the main battery charges the extended battery reaches a preset first threshold value, it is determined that the extended battery is replaced before the main battery; or, in the case that the number of times that the main battery charges the extended battery is less than the number of times that the extended battery charges the main battery within a preset time period, and the number of times that the extended battery charges the main battery reaches a preset second threshold value, it is determined that the main battery is replaced before the extended battery; otherwise, the replacement priority between the main battery and the extended battery is the same.

3. The method according to any one of claims 1 to 2, characterized in that, The determination of the replacement priority between the main battery and the extended battery according to the discharge condition comprises: determine whether the extendable power supply can meet the demand in a preset time period when powered by the single battery according to a discharge condition between the main battery and the extension battery; when the extendable power supply can meet the demand in the preset time period when powered by the single battery, determine a replacement priority between the main battery and the extension battery according to the discharge condition.

4. The method of claim 3, wherein, after determining the replacement priority between the main battery and the extension battery according to the discharge condition, the method further comprises: when the replacement priority between the main battery and the extension battery is not the same, reduce a maximum discharge current of the extendable power supply when discharging.

5. A charge-discharge control device applied to an extensible power supply, the extensible power supply having a main battery and an extension battery connected in parallel; characterized in that, the device comprises: a detection module configured to detect a discharge condition between a main battery and an extension battery in a battery pack; the discharge condition is used to represent a number of times that the main battery charges the extension battery and a number of times that the extension battery charges the main battery; a replacement priority determination module configured to determine a replacement priority between the main battery and the extension battery according to the discharge condition; a charge-discharge control logic determination module configured to determine a charge-discharge control logic of the main battery and the extension battery according to the replacement priority; a charge-discharge control module configured to control the main battery and the extension battery to charge and discharge according to the charge-discharge control logic; wherein, when the extension battery is replaced in priority to the main battery, the charge-discharge control logic of the main battery and the extension battery is determined as: a charging priority of the main battery is lower than a charging priority of the extension battery, and a discharging priority of the main battery is lower than the charging priority of the extension battery; or, when the main battery is replaced in priority to the extension battery, the charge-discharge control logic of the main battery and the extension battery is determined as: the charging priority of the main battery is higher than the charging priority of the extension battery, and the discharging priority of the main battery is higher than the charging priority of the extension battery; alternatively, when the extension battery is replaced in priority to the main battery, the charge-discharge control logic of the main battery and the extension battery is determined as: the main battery and the extension battery in a charging state are subjected to voltage detection, and when it is detected that the voltage of the extension battery reaches a preset third threshold value, the charging current is reduced; or, when the main battery is replaced in priority to the extension battery, the charge-discharge control logic of the main battery and the extension battery is determined as: the main battery and the extension battery in a charging state are subjected to voltage detection, and when it is detected that the voltage of the main battery reaches a preset fourth threshold value, the charging current is reduced; alternatively, when the extension battery is replaced in priority to the main battery, the charge-discharge control logic of the main battery and the extension battery is determined as: the main battery and the extension battery in a discharging state are subjected to voltage detection, and when it is detected that the voltage of the extension battery drops to a preset first discharge cutoff voltage, the extendable power supply is controlled to stop discharging; or, when the main battery is replaced in priority to the extension battery, the charge-discharge control logic of the main battery and the extension battery is determined as: the main battery and the extension battery in a discharging state are subjected to voltage detection, and when it is detected that the voltage of the main battery drops to a preset second discharge cutoff voltage, the extendable power supply is controlled to stop discharging.

6. A charge-discharge control device comprising a processor and a memory storing program instructions, characterized by, the processor is configured to execute the charge-discharge control method as claimed in any one of claims 1 to 4 when running the program instructions.

7. An extendable power supply comprising a main battery and an extension battery connected in parallel, the extendable power supply further comprising a power management system, characterized in that, The power management system executes the charge-discharge control method of any one of claims 1 to 4.

Images