CN114614123A - Electrochemical device, charging device and electronic equipment - Google Patents
Electrochemical device, charging device and electronic equipment Download PDFInfo
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- CN114614123A CN114614123A CN202210311811.8A CN202210311811A CN114614123A CN 114614123 A CN114614123 A CN 114614123A CN 202210311811 A CN202210311811 A CN 202210311811A CN 114614123 A CN114614123 A CN 114614123A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application provides an electrochemical device, a charging device and an electronic apparatus. The electrochemical device is connected with a processor, and the processor is configured to: and at the first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging under the first time period is larger than the first preset capacity, or responding to the fact that the time length of the electrochemical device for discharging under the first time period is larger than the first preset time length, wherein the accumulated discharge capacity of the electrochemical device for discharging under the first time period is larger than the preset multiplying power, and adjusting the charging strategy of the electrochemical device. By the method, the problem of safety of the electrochemical device caused by charging in a conventional charging mode after the electrochemical device is discharged under a high-rate working condition can be solved, so that the stability and the reliability of the electrochemical device are improved.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to an electrochemical device, a charging device, and an electronic apparatus.
Background
The battery is a device capable of converting chemical energy into electric energy, and has a metal electrode extending into an electrolyte solution, the metal electrode having a positive electrode and a negative electrode. Batteries play an important role in every aspect of modern social life.
However, in practice, the inventors found that in some situations, after the battery is charged, some safety problems may occur, such as severe lithium precipitation of the battery, failure of the battery to repair the damaged SEI (Solid Electrolyte Interface) film, or rapid cycle decay of the battery.
Disclosure of Invention
An object of the embodiments of the present application is to provide an electrochemical device, a charging device, and an electronic apparatus, so as to improve the safety problem that may exist after the electrochemical device is charged, and to improve the stability and reliability of the electrochemical device.
The invention is realized by the following steps:
in a first aspect, an embodiment of the present application provides an electrochemical device, connected to a processor, where the processor is configured to: at a first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device discharging in a first time period under the condition that the accumulated discharge capacity is larger than a first preset capacity, or responding to the fact that the time length of the electrochemical device discharging in the first time period under the condition that the accumulated discharge capacity is larger than a first preset time length under the condition that the accumulated discharge capacity is larger than a preset multiplying power is larger than the first preset capacity, and adjusting the charging strategy of the electrochemical device.
In the embodiment of the present application, if the electrochemical device discharges by using a discharge rate greater than a preset rate in a discharge process, and the accumulated discharge capacity is greater than a first preset capacity, or discharges by using a discharge rate greater than a preset rate, and the discharge duration is greater than a first preset duration, the charging strategy of the electrochemical device is adjusted. By the method, the problem of safety of the electrochemical device caused by charging in a conventional charging mode after the electrochemical device is discharged under a high-rate working condition can be solved, so that the stability and the reliability of the electrochemical device are improved.
In combination with the technical solution provided by the first aspect, in some possible implementations, the adjusting the charging strategy of the electrochemical device includes at least one of the following operations: lowering an upper charge limit voltage of the electrochemical device; reducing a charge current of the electrochemical device; reducing a cutoff protection temperature of the electrochemical device. By lowering the upper charge limit voltage of the electrochemical device; the charging current of the electrochemical device is reduced or the cut-off protection temperature of the electrochemical device is reduced, so that the safety risk of the electrochemical device after high-rate discharge during charging can be effectively reduced.
In combination with the technical solution provided by the first aspect, in some possible implementations, after adjusting the charging strategy of the electrochemical device, the processor is further configured to: and at a second moment after the first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging in a second time period is larger than a second preset capacity under the condition that the accumulated discharge capacity of the electrochemical device for discharging in the second time period is larger than the preset multiplying power, or responding to the fact that the time length of the electrochemical device for discharging in the second time period is larger than a second preset time length under the condition that the accumulated discharge capacity of the electrochemical device for discharging in the second time period is larger than the preset multiplying power, and adjusting the charging strategy of the electrochemical device. Namely, after the electrochemical device is adjusted by the primary charging strategy, the processor can continuously adjust the charging strategy of the electrochemical device according to the discharging condition of the electrochemical device under the high-rate working condition, so that the charging strategy of the electrochemical device is matched with the high-rate working condition of the electrochemical device in the complete discharging process before charging, and the safety and the sustainability of the electrochemical device in the whole life cycle can be further improved.
With reference to the technical solution provided by the first aspect, in some possible implementation manners, the second preset capacity is smaller than the first preset capacity, or the second preset duration is smaller than the first preset duration. That is, by setting the second preset capacity to be smaller than the first preset capacity, or setting the second preset duration to be smaller than the first preset duration, the adjustment frequency of the charging strategy of the electrochemical device can be continuously accelerated in the process of continuously performing high-rate discharge on the electrochemical device, and the safety and the sustainability of the electrochemical device in the whole life cycle can be further improved.
In combination with the technical solution provided by the first aspect, in some possible implementations, the processor is further configured to at least one of: stopping adjusting the upper charging limit voltage of the electrochemical device when the upper charging limit voltage of the electrochemical device is reduced to a preset voltage; stopping adjusting the charging current of the electrochemical device when the charging current of the electrochemical device is reduced to a preset current; and stopping adjusting the cut-off protection temperature of the electrochemical device when the cut-off protection temperature of the electrochemical device is reduced to a preset temperature. By setting the adjustment cut-off condition, the charging process of the electrochemical device is prevented from being influenced by the unlimited adjustment of the charging strategy, and the electrochemical device can be charged under reasonable and reliable charging conditions.
With reference to the technical solution provided by the first aspect, in some possible implementations, the processor is further configured to: when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering a timer to start timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing; acquiring a first accumulated time length of the timer; wherein the first accumulated time period is a time period for which the electrochemical device discharges at a rate greater than the preset rate. The discharge duration is effectively monitored through the timer, or the discharge duration is effectively monitored through the timer, and then the cumulative discharge capacity of the electrochemical device discharging in the first time period under the condition that the cumulative discharge capacity is larger than the preset multiplying power is calculated conveniently.
In combination with the technical solution provided by the first aspect, in some possible implementations, after adjusting the charging strategy of the electrochemical device, the processor is further configured to: judging whether the discharge multiplying power of the electrochemical device reaches the preset multiplying power or not; when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering the timer to restart timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing; acquiring a second accumulated time length of the timer; wherein the second accumulated time period is a time period after the charging strategy of the electrochemical device is adjusted and the electrochemical device is discharged under the condition that the second accumulated time period is greater than the preset multiplying power; determining whether it is necessary to continue adjusting the charging strategy of the electrochemical device based on the second accumulated time period. That is, after the charging strategy of the electrochemical device is adjusted each time, the timer is reset, so as to determine whether the charging strategy of the electrochemical device needs to be adjusted in the current discharging stage directly according to the accumulated duration of the timer.
In combination with the technical solution provided by the first aspect, in some possible implementations, after adjusting the charging strategy of the electrochemical device, the processor is further configured to: judging whether the discharge multiplying power of the electrochemical device reaches the preset multiplying power or not; when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering the timer to continue timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing; acquiring a third accumulated time length of the timer; wherein the third accumulated time period is a time period after the charging strategy of the electrochemical device is adjusted and the electrochemical device is discharged under the condition that the third accumulated time period is greater than the preset multiplying power; determining whether it is necessary to continue adjusting the charging strategy of the electrochemical device based on the third accumulated time period. That is, after the charging strategy of the electrochemical device is adjusted each time, the timer continues to count time when the discharge rate of the electrochemical device is greater than the preset rate, so as to determine the total discharge time of the electrochemical device at a rate greater than the preset rate in the whole discharge process.
In a second aspect, embodiments of the present application provide a charging device, which is connected to the electrochemical device provided in the above first aspect, and is configured to charge the electrochemical device.
In a third aspect, an embodiment of the present application provides an electronic apparatus, including an electrochemical device and a processor; the electrochemical device is connected with the processor; the processor is configured to: at a first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device discharging in a first time period under the condition that the accumulated discharge capacity is larger than a first preset capacity, or responding to the fact that the time length of the electrochemical device discharging in the first time period under the condition that the accumulated discharge capacity is larger than a first preset time length under the condition that the accumulated discharge capacity is larger than a preset multiplying power is larger than the first preset capacity, and adjusting the charging strategy of the electrochemical device.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, performs a method configured by the processor as in the first aspect described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a block diagram of an electronic device according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating steps of a charging policy adjusting method according to an embodiment of the present disclosure.
Fig. 3 is a flowchart illustrating steps of another charging strategy adjustment method according to an embodiment of the present disclosure.
Icon: 100-an electronic device; 110-an electrochemical device; 120-processor.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the description and claims of this application are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural groups" refers to two or more (including two).
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In view of the development of the current market situation, the application of the battery is more and more extensive. The battery can be applied to basic tools such as electric saws, electric drills and the like, and can also be applied to energy storage power supply systems of hydraulic power, firepower, wind power, solar power stations and the like. In recent years, batteries have been widely used in electric vehicles such as electric bicycles and electric automobiles. As the field of application of batteries is continuously expanded, the market demand thereof is also continuously expanded.
The inventor of the present application has noticed that, in some situations, after the battery is charged, some safety problems may occur, such as severe lithium precipitation of the battery, failure of timely repairing of the damaged SEI film of the battery, or rapid degradation of the battery cycle.
In order to solve the problems, the inventor finds out through long-term research that the actual use working conditions of some electric products are often uncertain, namely, non-constant-current constant-power discharge. Therefore, peak discharge requirements exist in the products, for example, under the working condition that the electric automobile is started in an instant acceleration mode, and for example, instantaneous high-rate discharge is needed when an electric drill is locked. However, the battery is damaged to a certain extent after the battery is discharged at a high rate, and the damage caused by the battery is larger as the number of times of the high-rate discharge of the battery is increased and the duration is longer. Damage to the battery includes, but is not limited to, the battery being continuously exposed to high temperature, side reactions of the battery being exacerbated, and active material particle breakage and SEI film breakage inside the battery. However, if the battery discharged at a high rate is charged in a conventional charging manner, the above-mentioned safety problem occurs.
In view of the above problems, the present inventors propose the following embodiments to solve the above problems.
Referring to fig. 1, an electronic device 100 is provided according to an embodiment of the present disclosure.
The electronic device 100 includes an electrochemical device 110 and a processor 120. Electrochemical device 110 is coupled to processor 120.
The electronic device 100 includes, but is not limited to, a notebook computer, a mobile terminal, a game machine, an electric drill, an electric saw, an electric car, an electric bicycle, and the like. The electrochemical device 110 includes, but is not limited to, a lithium battery, a nickel metal hydride battery, a lead acid battery, and the like. The processor 120 may be an integrated circuit chip having signal processing capabilities. The Processor 120 may also be a general-purpose Processor, for example, a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a discrete gate or transistor logic device, or a discrete hardware component, which may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present Application. A general purpose processor may be a microprocessor or any conventional processor or the like. When the electronic device 100 is an electric vehicle, the processor 120 may be a control module in a Battery Management System (BMS) configured for the electric vehicle, or may be a control module in a charging Management System configured for the electric vehicle, which is not limited in this application.
It should be noted that the structure shown in fig. 1 is only an illustration, and the electronic device 100 provided in the embodiment of the present application may also have fewer or more components than those shown in fig. 1, or have a different configuration than that shown in fig. 1. Further, the components shown in fig. 1 may be implemented by software, hardware, or a combination thereof.
Referring to fig. 2, an embodiment of the present application provides a charging policy adjusting method, where the method is configured in the processor, and the method specifically includes: and at a first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging within a first time period is larger than a first preset capacity under the condition that the accumulated discharge capacity is larger than the first preset capacity under the condition that the accumulated discharge capacity is larger than a preset multiplying power, or responding to the fact that the electrochemical device for discharging within the first time period is larger than a first preset time length under the condition that the accumulated discharge capacity is larger than the preset multiplying power, and adjusting the charging strategy of the electrochemical device.
It should be noted that the preset rate is a critical value for high rate discharge of the electrochemical device, and since different manufacturers and different types of batteries have different standards for high rate discharge, for example, for a battery, the standard for high rate discharge is to discharge at a discharge rate greater than 5C (the discharge rate is a current value required by the battery to discharge its rated capacity within a specified time, and is equal to a multiple of the rated capacity of the battery in a data value, and is generally indicated by the letter C), and for B battery, the standard for high rate discharge is to discharge at a discharge rate greater than 10C, so that specific values of the preset rate can be set according to different manufacturers or different types of batteries. Certainly, preset multiplying power also can be according to the extreme operating mode that discharges of product and confirm, for example regard as preset multiplying power with the discharge multiplying power when electric automobile accelerates to start in the twinkling of an eye, perhaps regard as preset multiplying power with the instantaneous big multiplying power when the electric drill stalls, in addition, preset multiplying power also can be according to the demand experiment gained, and this application does not limit this.
The first preset capacity and the first preset duration may be set according to actual requirements, and the first preset capacity may be a specific value, such as 50 ma hour, or a proportional value, such as 5%. Wherein the first predetermined capacity is 5% and represents 5% of the actual capacity of the electrochemical device of the first predetermined capacity.
The first preset time period includes, but is not limited to, 2 seconds, 5 seconds, etc., and the present application is not limited thereto.
That is, during the discharging process of the electrochemical device, the processor is configured to monitor the discharging condition of the electrochemical device, and then adaptively adjust the subsequent charging strategy of the electrochemical device according to the condition of the electrochemical device under the high-rate condition.
As a first adjustment mode, the processor continuously acquires the discharge rate of the electrochemical device, when the discharge rate of the electrochemical device is greater than a preset rate, acquires the discharge duration of the electrochemical device when the discharge duration is greater than the preset rate, calculates the cumulative discharge capacity of the electrochemical device when the discharge duration is greater than the preset rate, and adjusts the charging strategy of the electrochemical device when the cumulative discharge capacity is greater than a first preset capacity at the current time (i.e., a first time) in response to the situation that the cumulative discharge capacity of the electrochemical device when the discharge duration is greater than the preset rate in the current time period (the first time period) is greater than the first preset capacity.
The discharge rate is a current value required for the battery to discharge its rated capacity for a predetermined time, and is equal to a multiple of the rated capacity of the battery in data value, and is generally indicated by the letter C. This indicates how much the rechargeable battery is discharged, and for example, a nickel-metal hydride battery having a capacity of 2300 ma "is discharged at a discharge rate of 0.1C", that is, a discharge current I is 230 ma. Therefore, after the discharge current is determined by the discharge rate, the discharge current can be determined according to the calculation formula: the discharge capacity is the discharge current x the discharge time period, and the cumulative discharge capacity of the electrochemical device discharging at a rate greater than a predetermined rate is calculated.
For example, assume that the preset magnification is 5C and the first preset capacity is 50 ma hours. The processor continuously acquires the discharge multiplying power of the electrochemical device, when the discharge multiplying power of the electrochemical device is larger than 5C, the discharge duration of the electrochemical device under the condition that the discharge duration is larger than the preset multiplying power is obtained, the accumulated discharge capacity of the electrochemical device under the condition that the discharge duration is larger than the preset multiplying power is calculated, and if the accumulated discharge capacity is larger than 50 milliamperes, the processor adjusts the charging strategy of the electrochemical device at the moment.
It should be noted that, if the discharge rate is not constant on the premise that the discharge rate is greater than the preset rate, when calculating the discharge capacity, it is necessary to determine the corresponding discharge current according to different discharge rates, then multiply the determined discharge current by the corresponding discharge duration to obtain the discharge capacity in each time period in which the discharge is performed at different discharge rates, and finally accumulate all the discharge capacities.
Because the larger the cumulative capacity of the electrochemical device adopting high-rate discharge is, the larger the damage to the electrochemical device is, in the embodiment of the present application, by setting the first preset capacity, the processor can timely adjust the charging strategy of the electrochemical device when monitoring that the cumulative capacity of the electrochemical device adopting high-rate discharge reaches the first preset capacity, so that the electrochemical device adopts a safer charging strategy for charging, and the stability and reliability of the electrochemical device are improved.
As a second adjustment mode, the processor continuously acquires the discharge rate of the electrochemical device, acquires the discharge time of the electrochemical device when the discharge rate of the electrochemical device is greater than the preset rate, and then judges whether the discharge time is greater than the first preset time. When the time length is greater than a first preset time length, the processor responds to the condition that the time length of the electrochemical device discharging within the time period (first time period) is greater than a preset multiplying power is greater than the first preset time length at the current time (namely the first time), and adjusts the charging strategy of the electrochemical device.
For example, assuming that the preset magnification is 5C, the first preset time period is 10 seconds. The processor continuously acquires the discharge multiplying power of the electrochemical device, when the discharge multiplying power of the electrochemical device is larger than 5C, the discharge duration of the electrochemical device under the condition that the discharge duration is larger than the preset multiplying power is obtained, and then whether the discharge duration is larger than 10 seconds is judged. When the duration is greater than 10 seconds, the processor adjusts the charging strategy of the electrochemical device at that time.
Because the longer the discharge time of the electrochemical device adopting high-rate discharge is, the greater the damage to the electrochemical device is, in the embodiment of the application, by setting the first preset time, the processor can timely adjust the charging strategy of the electrochemical device when monitoring that the discharge time of the electrochemical device adopting high-rate discharge reaches the first preset time, so that the electrochemical device adopts a safer charging strategy for charging, and the stability and reliability of the electrochemical device are improved.
In summary, in the embodiment of the present application, if the electrochemical device discharges at a discharge rate greater than the predetermined rate and the accumulated discharge capacity is greater than the first predetermined capacity during the discharging process, or discharges at a discharge rate greater than the predetermined rate and the discharge duration is greater than the first predetermined duration, the charging strategy of the electrochemical device is adjusted. By the method, the problem of safety of the electrochemical device caused by charging in a conventional charging mode after the electrochemical device is discharged under a high-rate working condition can be solved, so that the stability and the reliability of the electrochemical device are improved.
In one embodiment, the adjusting the charging strategy of the electrochemical device may be to lower the upper charging limit voltage of the electrochemical device.
The specific value of the reduction of the upper charging limit voltage may be set according to a requirement, for example, adjusting the charging strategy of the electrochemical device may specifically reduce the upper charging limit voltage of the electrochemical device by 0.05 v, and for example, adjusting the charging strategy of the electrochemical device may specifically reduce the upper charging limit voltage of the electrochemical device by 0.1 v.
Of course, the upper limit charging voltage may be adjusted by lowering the upper limit charging voltage of the electrochemical device to 90% of the original upper limit charging voltage, which is not limited in the present application.
It should be noted that, after the electrochemical device is discharged at a high rate, in order to avoid the secondary influence of the high-voltage charging on the electrochemical device, the upper charging limit voltage of the electrochemical device is lowered to maintain the health of the electrochemical device.
In another embodiment, the adjusting the charging strategy of the electrochemical device may be decreasing the charging current of the electrochemical device.
The specific value of the reduction of the charging current may be set according to a requirement, for example, adjusting the charging strategy of the electrochemical device may specifically reduce the charging current of the electrochemical device by 0.1 ampere, and for example, adjusting the charging strategy of the electrochemical device may specifically reduce the charging current of the electrochemical device by 1 ampere.
Of course, the charging current may be adjusted in such a manner that the charging current of the electrochemical device is reduced to 80% of the initial charging current, which is not limited in the present application.
It should be noted that, after the electrochemical device is discharged at a high rate, in order to avoid the secondary influence of the high-rate charging on the electrochemical device, the charging current of the electrochemical device is reduced to maintain the health of the electrochemical device.
In yet another embodiment, the adjusting the charging strategy of the electrochemical device may be decreasing a cutoff protection temperature of the electrochemical device.
It should be noted that the cutoff protection temperature of the electrochemical device indicates a temperature limit during the operation of the electrochemical device, and when the temperature of the electrochemical device reaches the cutoff protection temperature, the use of the electrochemical device is limited. Therefore, after the electrochemical device is discharged at a high rate, in order to avoid secondary influence on the electrochemical device caused by high-temperature charging, the cut-off protection temperature of the electrochemical device is reduced, so as to maintain the health of the electrochemical device.
The cut-off protection temperature of the electrochemical device may also be set according to a requirement, for example, adjusting the charging strategy of the electrochemical device may specifically reduce the cut-off protection temperature of the electrochemical device by 5 degrees celsius, and for example, adjusting the charging strategy of the electrochemical device may specifically reduce the cut-off protection temperature of the electrochemical device by 3 degrees celsius.
In addition, in other embodiments, the adjustment of the charging strategy of the electrochemical device may further include any two of the three adjustment manners described above, and the adjustment of the charging strategy of the electrochemical device may further include the three adjustment manners described above at the same time, which is not limited in this application.
It can be seen that by lowering the upper charge limit voltage of the electrochemical device; the charging current of the electrochemical device is reduced or the cut-off protection temperature of the electrochemical device is reduced, so that the safety risk of the electrochemical device after high-rate discharge during charging can be effectively reduced.
The above charging strategy adjustment method may be configured to adjust only once, that is, when the processor adjusts the charging strategy of the electrochemical device in response to the accumulated discharge capacity of the electrochemical device discharging at a rate greater than a preset rate in a first time period being greater than a first preset capacity at the first time, or in response to the electrochemical device discharging at a rate greater than a preset rate in the first time period being greater than a first preset time period, the processor may not monitor the discharging condition of the electrochemical device. Accordingly, the processor may no longer adjust the charging strategy of the electrochemical device.
Of course, the above-described charging strategy adjustment method may also be configured to continuously adjust, i.e. after adjusting the charging strategy of the electrochemical device, the processor is further configured to: and at a second moment after the first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging at a second time period which is greater than the preset multiplying power is greater than a second preset capacity, or responding to the fact that the time length of the electrochemical device for discharging at a second time period which is greater than the preset multiplying power is greater than a second preset time length, and adjusting the charging strategy of the electrochemical device.
The aforementioned preset multiplying power can refer to the description in the foregoing embodiment, the second preset capacity and the second preset duration can also be set according to actual requirements, and the second preset capacity can be a specific value, such as 50 ma, or a proportional value, such as 5%. Wherein the second predetermined capacity is 5%, which represents 5% of the actual capacity of the electrochemical device. The second preset time period includes, but is not limited to, 2 seconds, 5 seconds, etc., and the present application is not limited thereto.
In an embodiment, the subsequent charging strategy adjustment process may be configured to the same adjustment condition, that is, the second preset capacity is equal to the first preset capacity, and the second preset duration is equal to the first preset duration.
In another embodiment, the subsequent charging policy adjustment process may be configured to be different adjustment conditions, specifically, the second preset capacity is smaller than the first preset capacity, or the second preset duration is smaller than the first preset duration.
Illustratively, the first predetermined capacity is 50 milliamp hours and the second predetermined capacity is 30 milliamp hours. The electrochemical device is adjusted for the first charging strategy when the high-rate discharge reaches a cumulative discharge capacity of 50 ma. After the electrochemical device is adjusted by the primary charging strategy, the secondary charging strategy is adjusted when the next high-rate discharge reaches the accumulated discharge capacity of 30 mAmp.
That is, by setting the second preset capacity to be smaller than the first preset capacity, or setting the second preset duration to be smaller than the first preset duration, the adjustment frequency of the charging strategy of the electrochemical device can be continuously accelerated in the process of continuously performing high-rate discharge on the electrochemical device, and the safety and the sustainability of the electrochemical device in the whole life cycle can be further improved.
When the charging strategy adjusting method is configured to be continuously adjusted, the processor continues to monitor the discharging working condition of the electrochemical device after the electrochemical device is adjusted once, and then adaptively adjusts the subsequent charging strategy of the electrochemical device according to the condition of the electrochemical device under the high-rate working condition.
Illustratively, as a first adjustment manner, the processor may continue to acquire the discharge rate of the electrochemical device after adjusting the charging strategy of the electrochemical device in response to that the accumulated discharge capacity of the electrochemical device discharging at a rate greater than a preset rate in a first time period is greater than a first preset capacity at the first time, acquire a discharge duration of the electrochemical device discharging at a rate greater than the preset rate when the discharge rate of the electrochemical device is greater than the preset rate, calculate the accumulated discharge capacity of the electrochemical device discharging at a rate greater than the preset rate based on the discharge duration, and if the accumulated discharge capacity is greater than a second preset capacity, respond to that the accumulated discharge capacity of the electrochemical device discharging at a rate greater than the preset rate in the time period (second time period) is greater than the second preset capacity at the current time (i.e., a second time), the charging strategy of the electrochemical device continues to be adjusted.
Adjusting the charging strategy of the electrochemical device at this time may also include at least one of the following operations: lowering the upper charge limit voltage of the electrochemical device; reducing the charging current of the electrochemical device; the cut-off protection temperature of the electrochemical device is lowered.
As an example, as a second adjustment manner, at a first time, in response to that a duration of discharging of the electrochemical device within a first time period that is greater than a preset magnification is greater than a first preset duration, the processor may continue to acquire the discharge magnification of the electrochemical device after adjusting a charging strategy of the electrochemical device, obtain, when the discharge magnification of the electrochemical device is greater than the preset magnification, a duration of discharging of the electrochemical device within the first time period that is greater than the preset magnification, and then determine whether the duration is greater than a second preset duration. When the time length is greater than a second preset time length, the processor responds to the condition that the time length of the electrochemical device discharging within the time period (second time period) is greater than the second preset time length when the time length is greater than the second preset time length at the current time (namely the second time), and adjusts the charging strategy of the electrochemical device.
Since the two adjustment manners (adjustment based on the accumulated discharge capacity and adjustment based on the accumulated discharge time period) are basically the same as the implementation processes of the two adjustment manners in the foregoing embodiment, in order to avoid redundancy, the two adjustment manners are not described in detail, and the same parts may be referred to each other.
Optionally, the adjustment modes configured by the processor may be unified, or may also be in a cross mode. For example, in a uniform manner, the processor may adjust the charging strategy of the electrochemical device according to the accumulated discharge capacity of the electrochemical device at the high rate, i.e., each adjustment determines the accumulated discharge capacity of the electrochemical device at the high rate. If the crossover mode is adopted, the processor may adjust the charging strategy of the electrochemical device according to the accumulated discharge capacity of the electrochemical device at the high rate, and then adjust the charging strategy of the electrochemical device according to the accumulated discharge duration of the electrochemical device at the high rate. That is, the processor may adjust the charging strategy of the electrochemical device at a first time in response to the cumulative discharge capacity of the electrochemical device discharging at a rate greater than a preset rate over a first time period being greater than a first preset capacity, and then adjust the charging strategy of the electrochemical device at a second time after the first time in response to the electrochemical device discharging at a rate greater than the preset rate over a second time period being greater than a second preset time period.
Since the above-described charging strategy adjustment method is configured to continuously adjust, the processor, after adjusting the charging strategy of the electrochemical device a second time, is further configured to: and at a third time after the second time, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging at a third time period which is greater than the preset multiplying power is greater than a third preset capacity, or responding to the fact that the time length of the electrochemical device for discharging at a third time period which is greater than the preset multiplying power is greater than a third preset time length, and adjusting the charging strategy of the electrochemical device.
The third preset capacity and the third preset duration may be set according to actual requirements, and the third preset capacity may be a specific numerical value, such as 50 ma hour, or a proportional numerical value, such as 5%. Wherein the third predetermined capacity is 5%, which represents 5% of the actual capacity of the electrochemical device. The third preset time period includes, but is not limited to, 1 second, 2 seconds, etc., and the present application is not limited thereto.
The subsequent charging strategy adjustment process may be configured to be under the same adjustment condition, that is, the third preset capacity is equal to the first preset capacity and the second preset capacity, and the third preset duration is equal to the first preset duration and the second preset duration. In addition, the subsequent charging strategy adjustment process may be configured to different adjustment conditions, specifically, the third preset capacity is smaller than the second preset capacity, or the third preset duration is smaller than the second preset duration.
Since the subsequent adjustment process is substantially the same as the adjustment process in the foregoing embodiment, in order to avoid redundancy, no detailed description is provided here, and the same portions may be referred to each other.
In summary, after the electrochemical device is adjusted by the primary charging strategy, the processor can continue to adjust the charging strategy of the electrochemical device according to the discharging condition of the electrochemical device under the high-rate working condition, so that the charging strategy of the electrochemical device is matched with the high-rate working condition of the electrochemical device in the complete discharging process before charging, and the safety and sustainability of the electrochemical device in the whole life cycle can be further improved.
Furthermore, in order to avoid that unlimited adjustments of the charging strategy affect the charging process of the electrochemical device, ensuring that the electrochemical device is capable of being charged under reasonable, reliable charging conditions, the processor is further configured to at least one of: stopping adjusting the upper charging limit voltage of the electrochemical device when the upper charging limit voltage of the electrochemical device is reduced to a preset voltage; stopping adjusting the charging current of the electrochemical device when the charging current of the electrochemical device is reduced to a preset current; when the cut-off protection temperature of the electrochemical device is reduced to a preset temperature, the adjustment of the cut-off protection temperature of the electrochemical device is stopped.
That is, unlimited adjustment of the charging strategy is avoided by setting an adjustment cutoff condition. The preset voltage, the preset current and the preset temperature can be set according to different types of electrochemical devices, and the application is not limited.
Further, when the processor adjusts the charging strategy of the electrochemical device to be configured for at least two operations, then when either of the adjustment operations reaches a set adjustment cutoff condition, then adjustment of the charging strategy of the electrochemical device is stopped.
For example, when the processor adjusts the charging strategy of the electrochemical device configured to decrease the charging upper-limit voltage of the electrochemical device and decrease the charging current of the electrochemical device, the adjustment of the charging strategy is stopped when the charging upper-limit voltage decreases to the preset voltage or when the charging current decreases to the preset current.
Optionally, the processor obtains a duration of time that the electrochemical device discharges at a rate greater than a preset rate by means of a timer. That is, the processor is further configured to: when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering a timer to start timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering a timer to stop timing; acquiring a first accumulated duration of a timer; the first accumulated time is the time for which the electrochemical device discharges under the condition that the discharge rate is greater than the preset rate.
In the embodiment of the application, the discharge duration is effectively monitored through the timer, or the discharge duration is effectively monitored through the timer, so that the cumulative discharge capacity of the electrochemical device discharging in the first time period with the rate greater than the preset rate is calculated.
In an embodiment, after adjusting the charging strategy of the electrochemical device, the processor is further configured to: judging whether the discharge multiplying power of the electrochemical device reaches the preset multiplying power or not; when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering the timer to restart timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering a timer to stop timing; acquiring a second accumulated time length of the timer; the second accumulated time length is the time length after the charging strategy of the electrochemical device is adjusted and the electrochemical device discharges under the condition that the second accumulated time length is larger than the preset multiplying power; based on the second accumulated time period, it is determined whether it is necessary to continue adjusting the charging strategy of the electrochemical device.
Wherein determining whether the charging strategy for the electrochemical device needs to be continuously adjusted based on the second accumulated time period comprises: based on the second accumulated time length, calculating the accumulated discharge capacity of the electrochemical device for discharging under the condition that the discharge rate is greater than the preset multiplying power, and determining whether the charging strategy of the electrochemical device needs to be continuously adjusted or not based on the accumulated discharge capacity; and determining whether the charging strategy of the electrochemical device needs to be continuously adjusted based on the comparison result of the second accumulated time period and the second preset time period.
Since the two adjustment methods have been described in the foregoing embodiments, repeated description is omitted here, and the same parts may be referred to each other.
Illustratively, after the processor adjusts the charging strategy of the electrochemical device once, the timer is cleared, at this time, the processor continues to acquire the discharge rate of the electrochemical device, when the discharge rate of the electrochemical device is greater than the preset rate, the timer starts timing from zero again, when the discharge rate of the electrochemical device is less than the preset rate, the timer stops timing, and then the second accumulated duration of the timer is directly acquired, so as to determine whether the charging strategy of the electrochemical device needs to be adjusted continuously.
It can be seen that in this embodiment, the timer is re-timed each time the charging strategy of the electrochemical device is adjusted, so as to determine whether the charging strategy of the electrochemical device needs to be adjusted in the current discharging stage directly according to the accumulated duration of the timer.
In yet another embodiment, the processor is further configured to: judging whether the discharge multiplying power of the electrochemical device reaches a preset multiplying power or not; when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering a timer to continue timing; when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering a timer to stop timing; acquiring a third accumulated time length of the timer; the third accumulated time length is the time length after the charging strategy of the electrochemical device is adjusted and the electrochemical device discharges under the condition that the charging strategy is larger than the preset multiplying power; determining whether it is necessary to continue adjusting the charging strategy of the electrochemical device based on the third accumulated time period.
Wherein determining whether the charging strategy for the electrochemical device needs to be adjusted based on the third accumulated time period comprises: based on the third accumulated time length, calculating the accumulated discharge capacity of the electrochemical device for discharging under the condition that the discharge rate is greater than the preset multiplying power, and determining whether the charging strategy of the electrochemical device needs to be continuously adjusted or not based on the accumulated discharge capacity; and determining whether the charging strategy of the electrochemical device needs to be continuously adjusted based on the comparison result of the third accumulated time period and the second preset time period.
Since the two adjustment methods have been described in the foregoing embodiments, repeated description is omitted here, and the same parts may be referred to each other.
Illustratively, after the processor adjusts the charging strategy of the electrochemical device once, the timer continues to keep current counting, at this time, the processor continues to collect the discharge rate of the electrochemical device, when the discharge rate of the electrochemical device is greater than the preset rate, the timer continues to count, when the discharge rate of the electrochemical device is less than the preset rate, the timer stops counting, and then a third accumulated duration of the timer is obtained, where it is required to be noted that the third accumulated duration is obtained by subtracting the total duration accumulated by the timer when the processor adjusts the charging strategy of the electrochemical device at the previous time from the total duration accumulated by the current timer. Finally, it is determined whether the charging strategy of the electrochemical device needs to be continuously adjusted based on the third accumulated time period.
It can be seen that, in this embodiment, after the charging strategy of the electrochemical device is adjusted each time, the timer continues to count time when the discharge rate of the electrochemical device is greater than the preset rate, so as to determine the total discharge time of the electrochemical device at a rate greater than the preset rate in the whole discharge process.
Referring to fig. 3, a method for adjusting a charging strategy according to an embodiment of the present application is described as a complete example. In the discharging process of the electrochemical device, the processor acquires the discharging multiplying power of the electrochemical device in the discharging process at the moment, then judges whether the discharging multiplying power is larger than a preset threshold value or not, and triggers a timer to start timing if the discharging multiplying power is larger than the preset threshold value. If the discharge multiplying power is smaller than the preset threshold value, no processing is carried out, the discharge multiplying power of the electrochemical device in the discharge process is continuously obtained, and if the discharge multiplying power of the electrochemical device is smaller than the preset threshold value after the timer is triggered to start, the timing of the timer is stopped. After the timer starts counting, the cumulative discharge capacity of the electrochemical device is calculated based on the length of time accumulated by the timer. And then judging whether the accumulated discharge capacity is larger than a first preset capacity. If the accumulated discharge capacity is greater than the first predetermined capacity, adjusting a charging strategy of the electrochemical device, such as reducing an upper charging limit voltage of the electrochemical device, reducing a charging current of the electrochemical device, or reducing a cutoff protection temperature of the electrochemical device. And if the accumulated discharge capacity is smaller than the first preset capacity, not processing, and continuously determining whether the timer needs to be triggered for timing according to the discharge condition of the electrochemical device. And after the charging strategy of the electrochemical device is adjusted once, resetting the timer, and adjusting again according to the steps. When the charging upper limit voltage of the electrochemical device is reduced to a preset voltage, when the charging current of the electrochemical device is reduced to a preset current, or when the cut-off protection temperature of the electrochemical device is reduced to a preset temperature, the adjustment of the charging strategy of the electrochemical device is stopped.
Based on the same inventive concept, the embodiment of the application also provides a charging device. The charging device is connected to the electrochemical device in the above embodiment. The charging device is used for charging the electrochemical device.
In particular, the charging device is configured to charge the electrochemical device via the adjusted charging strategy.
Based on the same inventive concept, embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the computer program performs the methods provided in the above embodiments.
The storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An electrochemical device coupled to a processor, wherein the processor is configured to:
at a first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device discharging in a first time period under the condition that the accumulated discharge capacity is larger than a first preset capacity, or responding to the fact that the time length of the electrochemical device discharging in the first time period under the condition that the accumulated discharge capacity is larger than a first preset time length under the condition that the accumulated discharge capacity is larger than a preset multiplying power is larger than the first preset capacity, and adjusting the charging strategy of the electrochemical device.
2. The electrochemical device of claim 1, wherein said adjusting a charging strategy of said electrochemical device comprises at least one of:
lowering an upper charge limit voltage of the electrochemical device;
reducing a charge current of the electrochemical device;
reducing a cutoff protection temperature of the electrochemical device.
3. The electrochemical device of claim 1, wherein after adjusting the charging strategy of the electrochemical device, the processor is further configured to:
and at a second moment after the first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device for discharging in a second time period is larger than a second preset capacity under the condition that the accumulated discharge capacity of the electrochemical device for discharging in the second time period is larger than the preset multiplying power, or responding to the fact that the time length of the electrochemical device for discharging in the second time period is larger than a second preset time length under the condition that the accumulated discharge capacity of the electrochemical device for discharging in the second time period is larger than the preset multiplying power, and adjusting the charging strategy of the electrochemical device.
4. The electrochemical device of claim 3, wherein said second predetermined capacity is less than said first predetermined capacity, or said second predetermined duration is less than said first predetermined duration.
5. The electrochemical device of claim 3, wherein the processor is further configured to at least one of:
stopping adjusting the upper charging limit voltage of the electrochemical device when the upper charging limit voltage of the electrochemical device is reduced to a preset voltage;
stopping adjusting the charging current of the electrochemical device when the charging current of the electrochemical device is reduced to a preset current;
and stopping adjusting the cut-off protection temperature of the electrochemical device when the cut-off protection temperature of the electrochemical device is reduced to a preset temperature.
6. The electrochemical device of claim 1, wherein the processor is further configured to:
when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering a timer to start timing;
when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing;
acquiring a first accumulated time length of the timer; wherein the first accumulated time period is a time period for which the electrochemical device discharges at a rate greater than the preset rate.
7. The electrochemical device of claim 6, wherein after adjusting the charging strategy of the electrochemical device, the processor is further configured to:
judging whether the discharge multiplying power of the electrochemical device reaches the preset multiplying power or not;
when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering the timer to restart timing;
when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing;
acquiring a second accumulated time length of the timer; wherein the second accumulated time period is a time period after the charging strategy of the electrochemical device is adjusted and the electrochemical device is discharged under the condition that the second accumulated time period is greater than the preset multiplying power;
determining whether it is necessary to continue adjusting the charging strategy of the electrochemical device based on the second accumulated time period.
8. The electrochemical device of claim 6, wherein after adjusting the charging strategy of the electrochemical device, the processor is further configured to:
judging whether the discharge multiplying power of the electrochemical device reaches the preset multiplying power or not;
when the discharge multiplying power of the electrochemical device is larger than the preset multiplying power, triggering the timer to continue timing;
when the discharge multiplying power of the electrochemical device is smaller than the preset multiplying power, triggering the timer to stop timing;
acquiring a third accumulated time length of the timer; wherein the third accumulated time period is a time period after the charging strategy of the electrochemical device is adjusted and the electrochemical device is discharged under the condition that the third accumulated time period is greater than the preset multiplying power;
determining whether it is necessary to continue adjusting the charging strategy of the electrochemical device based on the third accumulated time period.
9. A charging device, wherein the charging device is connected to the electrochemical device according to any one of claims 1 to 8, and the charging device is used to charge the electrochemical device.
10. An electronic device comprising an electrochemical device and a processor; the electrochemical device is connected with the processor;
the processor is configured to: at a first moment, responding to the fact that the accumulated discharge capacity of the electrochemical device discharging in a first time period under the condition that the accumulated discharge capacity is larger than a first preset capacity, or responding to the fact that the time length of the electrochemical device discharging in the first time period under the condition that the accumulated discharge capacity is larger than a first preset time length under the condition that the accumulated discharge capacity is larger than a preset multiplying power is larger than the first preset capacity, and adjusting the charging strategy of the electrochemical device.
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