CN112448039B - Lithium ion battery and lithium ion battery charging and discharging control method and device - Google Patents
Lithium ion battery and lithium ion battery charging and discharging control method and device Download PDFInfo
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- CN112448039B CN112448039B CN201910839315.8A CN201910839315A CN112448039B CN 112448039 B CN112448039 B CN 112448039B CN 201910839315 A CN201910839315 A CN 201910839315A CN 112448039 B CN112448039 B CN 112448039B
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- 238000007600 charging Methods 0.000 title claims abstract description 161
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 140
- 238000007599 discharging Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010280 constant potential charging Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/446—Initial charging measures
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical Kinetics & Catalysis (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The disclosure relates to a lithium ion battery and a lithium ion battery charging and discharging control method and a device, wherein the method is applied to a terminal, the lithium ion battery comprises a high-rate electric core group and a low-rate electric core, the high-rate electric core group and the low-rate electric core are connected in parallel, the high-rate electric core group comprises a plurality of series-connected high-rate electric cores, the charging rate of a single high-rate electric core is greater than that of a single low-rate electric core, and the method comprises the following steps: acquiring a charge and discharge instruction aiming at the lithium ion battery; and preferentially charging the high-rate battery pack according to the acquired charging instruction, or discharging the lithium ion battery according to the acquired discharging instruction and the temperature of the lithium ion battery. The method can improve the overall capacity of the lithium ion battery and meet the requirement of a user on supplementing a certain amount of electricity in a short time.
Description
Technical Field
The present disclosure relates to the field of lithium ion batteries, and in particular, to a lithium ion battery and a method and an apparatus for controlling charging and discharging of the lithium ion battery.
Background
At present, the requirements for the capacity and the charging speed of the lithium ion battery are higher and higher. And the volume energy density of the lithium ion battery with low charge rate is much larger than that of the lithium ion battery with high charge rate, so that for the lithium ion battery, the higher the charge rate is, the shorter the charge time is and the smaller the volume energy density is. If a lithium ion battery with high charging rate is used, the charging speed is high, but the volume of the lithium ion battery can only be increased if the capacity of the lithium ion battery is large due to low volume energy density, so that the volume of the electronic equipment is increased when the lithium ion battery is applied to the electronic equipment. If a lithium ion battery with a low charge rate is used, the charging speed is slow although the capacity of the lithium ion battery is large. Therefore, it is difficult for the current lithium ion battery to satisfy both the battery capacity and the charging speed.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a lithium ion battery and a method and an apparatus for controlling charging and discharging of the lithium ion battery.
According to a first aspect of the embodiments of the present disclosure, a lithium ion battery is provided, where the lithium ion battery includes a high-rate electric core group and a low-rate electric core, the high-rate electric core group and the low-rate electric core are connected in parallel, the high-rate electric core group includes a plurality of series-connected high-rate electric cores, the charging rate of the single high-rate electric core is greater than the charging rate of the single low-rate electric core, and the high-rate electric core group and the low-rate electric core are electrically connected to a control circuit.
Optionally, the lithium ion battery comprises a high-rate battery core group and a low-rate battery core, the high-rate battery core group is connected in parallel with the low-rate battery core, and the high-rate battery core group is formed by connecting 2 high-rate battery cores in series.
According to a second aspect of the embodiments of the present disclosure, there is provided a charge and discharge control method for a lithium ion battery, where the method is applied to a terminal, the lithium ion battery includes a high-rate electric core group and a low-rate electric core, the high-rate electric core group and the low-rate electric core are connected in parallel, the high-rate electric core group includes a plurality of series-connected high-rate electric cores, and a charge rate of a single high-rate electric core is greater than a charge rate of a single low-rate electric core, and the method includes: acquiring a charge and discharge instruction aiming at the lithium ion battery; and preferentially charging the high-rate battery pack according to the acquired charging instruction, or discharging the lithium ion battery according to the acquired discharging instruction and the temperature of the lithium ion battery.
Optionally, the preferentially charging the high-rate cell pack according to the acquired charging instruction includes: and adjusting the charging current of the high-rate battery core group and the low-rate battery core according to the voltage of the high-rate battery core group and the voltage of the low-rate battery core so as to ensure that the high-rate battery core group is charged preferentially.
Optionally, the adjusting the charging current to the high-rate electric core group and the low-rate electric core according to the voltage of the high-rate electric core group and the voltage of the low-rate electric core to ensure that the high-rate electric core group is charged preferentially includes: when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
Optionally, the obtaining of the internal resistance of the lithium ion battery includes: the discharging the lithium ion battery according to the obtained discharging instruction and according to the temperature of the lithium ion battery comprises: tlu ═ Thu, Thl < Tll, when Tll ≦ T ≦ Tlu, the high-rate core group is discharged and the low-rate cells are discharged, when Thl ≦ T ≦ Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower-limit discharge temperature of the low-rate cells, Tlu represents the upper-limit discharge temperature of the low-rate cells, Thl represents the lower-limit discharge temperature of the high-rate core group, and Thu represents the upper-limit discharge temperature of the high-rate core group.
Optionally, when the discharge current of the lithium ion battery is smaller than a preset value, and when the voltage of the high-rate battery cell group is in a preset voltage segment and the voltage of the low-rate battery cell is in a preset voltage segment, the high-rate battery cell group charges the low-rate battery cell.
According to a third aspect of the embodiments of the present disclosure, there is provided a lithium ion battery charge and discharge control device. The device is applied to the terminal, lithium ion battery includes high magnification electric core group and low magnification electric core, high magnification electric core group with low magnification electric core is parallelly connected, high magnification electric core group includes the high magnification electric core of a plurality of series connections, singly the multiplying power that charges of high magnification electric core is greater than singly the multiplying power that charges of low magnification electric core, the device includes: an acquisition unit configured to acquire a charge and discharge instruction for the lithium ion battery; and the charging and discharging unit is configured to charge the high-rate cell group preferentially according to the acquired charging instruction or discharge the lithium ion battery according to the acquired discharging instruction and the temperature of the lithium ion battery.
Optionally, the charging and discharging unit is configured to preferentially charge the high-rate cell group according to the acquired charging instruction in the following manner: and adjusting the charging current of the high-rate battery core group and the low-rate battery core according to the voltage of the high-rate battery core group and the voltage of the low-rate battery core so as to ensure that the high-rate battery core group is charged preferentially.
Optionally, the charging and discharging unit is configured to adjust the charging current to the high-rate battery core group and the low-rate battery core according to the voltage of the high-rate battery core group and the voltage of the low-rate battery core in a manner as follows, so as to ensure that the high-rate battery core group is charged preferentially: when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
Optionally, the charging and discharging unit is configured to discharge the lithium ion battery according to the obtained discharge instruction and according to the temperature of the lithium ion battery, in the following manner: tlu ═ Thu, Thl < Tll, when Tll ≦ T ≦ Tlu, the high-rate core group is discharged and the low-rate cells are discharged, when Thl ≦ T ≦ Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower-limit discharge temperature of the low-rate cells, Tlu represents the upper-limit discharge temperature of the low-rate cells, Thl represents the lower-limit discharge temperature of the high-rate core group, and Thu represents the upper-limit discharge temperature of the high-rate core group.
Optionally, when the discharge current of the lithium ion battery is smaller than a preset value, and when the voltage of the high-rate battery cell group is in a preset voltage segment and the voltage of the low-rate battery cell is in a preset voltage segment, the high-rate battery cell group charges the low-rate battery cell.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a lithium ion battery charge and discharge control device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the lithium ion battery charging and discharging control method according to the second aspect or any one of the second aspects.
According to a fifth aspect of embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, wherein instructions of the storage medium, when executed by a processor of a mobile terminal, enable the mobile terminal to perform the lithium ion battery charging and discharging control method according to the second aspect or any one of the second aspects.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the lithium ion battery has the advantages that the overall capacity of the lithium ion battery is improved, and meanwhile, the requirement of a user for rapidly supplementing a certain amount of electricity in a short time is met, namely, the requirements of people in the aspects of battery capacity and charging speed are met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram illustrating a lithium-ion battery according to an exemplary embodiment.
Fig. 2 is a flowchart illustrating a method for controlling charging and discharging of a lithium ion battery according to an exemplary embodiment.
Fig. 3 is a block diagram illustrating a lithium ion battery charge and discharge control apparatus according to an exemplary embodiment.
Fig. 4 is a block diagram illustrating another lithium ion battery charge and discharge control apparatus according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The present disclosure provides a lithium ion battery. The lithium ion battery comprises a high-rate battery core group and a low-rate battery core, wherein the high-rate battery core group is connected with the low-rate battery core in parallel, the high-rate battery core group comprises a plurality of high-rate battery cores connected in series, and is single, the charging rate of the high-rate battery core is greater than single, the charging rate of the low-rate battery core is greater than single, and the high-rate battery core group and the low-rate battery core are electrically connected with a control circuit. Referring to fig. 1, fig. 1 is a schematic diagram illustrating a lithium ion battery according to an exemplary embodiment. As shown in fig. 1, the lithium ion battery 1 includes a high-rate battery cell group a and a low-rate battery cell b, the high-rate battery cell group a and the low-rate battery cell b are connected in parallel, the high-rate battery cell group a includes 2 high-rate battery cells a1 and a2 connected in series, the charging rates of the high-rate battery cells a1 and a2 are both greater than that of the low-rate battery cell b, and the high-rate battery cell group a and the low-rate battery cell b are electrically connected to the control circuit 2. As shown in fig. 1, the control circuit 2 may be provided separately from the lithium ion battery 1, for example in the terminal. In further embodiments, the control circuit 2 may also be provided in the lithium ion battery 1.
According to the embodiments of the present disclosure, the high-rate cells a1 and a2 may be, for example, lithium titanate cells, which have a characteristic of high charge rate, and the low-rate cells b may be, for example, lithium cobaltate cells, which have a characteristic of low charge rate, and have a large volumetric energy density. For example, the charge rate of the high-rate cells a1 and a2 may be 6C, and the charge rate of the low-rate cell b may be 1C. In addition, according to the actual situation, the high-rate battery cell group a can also comprise 3 or more high-rate battery cells connected in series.
The disclosure also provides a charge and discharge control method of the lithium ion battery. As described above, the lithium ion battery includes a high-rate battery cell group and a low-rate battery cell, the high-rate battery cell group and the low-rate battery cell are connected in parallel, and the high-rate battery cell group is formed by connecting a plurality of high-rate battery cells in series. Specifically, as shown in fig. 1, the lithium ion battery 1 includes a high-rate battery cell group a and a low-rate battery cell b, the high-rate battery cell group a and the low-rate battery cell b are connected in parallel, the high-rate battery cell group a includes 2 high-rate battery cells a1 and a2 connected in series, the charging rates of the high-rate battery cells a1 and a2 are both greater than that of the low-rate battery cell b, and the high-rate battery cell group a and the low-rate battery cell b are electrically connected to the control circuit 2. Referring to fig. 2, fig. 2 is a flowchart illustrating a charge and discharge control method of a lithium ion battery according to an exemplary embodiment. As shown in fig. 2, the lithium ion battery charge and discharge control method is used in a terminal and includes the following steps S101 to S102. A terminal, which may also be referred to as User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice and/or data connectivity to a user, and for example, the terminal may be a handheld device, a vehicle-mounted device, etc. with a wireless connection function. Currently, some examples of terminals are: a smart phone (mobile phone), a Pocket computer (PPC), a palm top computer, a Personal Digital Assistant (PDA), a notebook computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. The terminal of the present disclosure is, for example, a mobile phone.
In step S101, a charge/discharge command for the lithium ion battery is acquired. According to the embodiment of the disclosure, a charging instruction or a discharging instruction for a lithium ion battery in a mobile phone is acquired.
In step S102, the high-rate cell group is charged preferentially according to the acquired charging instruction, or the lithium ion battery is discharged according to the acquired discharging instruction and according to the temperature of the lithium ion battery. According to the embodiment of the disclosure, when a charging instruction is obtained, the lithium ion battery in the mobile phone is charged, the high-rate battery pack is charged preferentially, and when a discharging instruction is obtained, the lithium ion battery is discharged according to the temperature of the lithium ion battery in the mobile phone.
According to the embodiment of the present disclosure, the preferentially charging the high-rate cell group according to the acquired charging instruction includes: and adjusting the charging current of the high-rate battery core group and the low-rate battery core according to the voltage of the high-rate battery core group and the voltage of the low-rate battery core so as to ensure that the high-rate battery core group is charged preferentially.
In this embodiment, the high-rate battery pack is charged by preferentially distributing current according to the voltage of the high-rate battery pack and the voltage of the low-rate battery.
According to an embodiment of the present disclosure, the adjusting the charging current to the high-rate battery pack and the low-rate battery cell according to the voltage of the high-rate battery pack and the voltage of the low-rate battery cell to ensure that the high-rate battery pack is charged preferentially includes: when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
In this embodiment, it should be noted that, with respect to the maximum charging current, when the charger is a dedicated charger for the lithium ion battery, the maximum charging current refers to a rated charging current of the charger (equal to the charging upper limit current set in the cellular phone). When the charger is not a special charger, if the rated current of the charger is larger than the charging upper limit current set in the mobile phone, the maximum charging current still refers to the charging upper limit current set in the mobile phone; if the rated current of the charger is smaller than the charging upper limit current set in the mobile phone, the maximum charging current refers to the rated current charging of the charger which is smaller than the charging upper limit current set in the mobile phone.
In this embodiment, specifically, the upper charging limit voltage of the high-rate cell group and the upper charging limit voltage of the low-rate cell may be the same or different. When the voltage of the high-rate electric core group and the voltage of the low-rate electric core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate electric core group, the high-rate electric core group is charged by the upper limit charging current of the high-rate electric core group, the low-rate electric core is charged by the current obtained by subtracting the upper limit charging current of the high-rate electric core group from the maximum current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate electric core group, the high-rate electric core group is charged by the maximum charging current without charging the low-rate electric core.
Further, under the condition that the voltage of the high-rate electric core group or the voltage of the low-rate electric core reaches a preset voltage, performing constant voltage charging on the high-rate electric core group or the low-rate electric core reaching the preset voltage, when the maximum charging current is greater than the upper limit charging current of the high-rate electric core group and the low-rate electric core, continuing to charge the high-rate electric core group or the low-rate electric core which does not reach the preset voltage with the upper limit charging current of the high-rate electric core group or the low-rate electric core until reaching the preset voltage, and when the maximum charging current is less than or equal to the upper limit charging current of the high-rate electric core group and the low-rate electric core, charging the low-rate electric core or the high-rate electric core which does not reach the preset voltage with the current obtained by subtracting the current for performing constant voltage charging on the high-rate electric core group or the low-rate electric core with the maximum charging current, until the preset voltage is reached.
In one embodiment, the preset voltage (e.g., 4.4V) may be equal to the upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells (in the case where the upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells are the same, e.g., 4.4V), or the preset voltage (e.g., 4.4V) may be equal to the minimum upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells (in the case where the upper charge limit voltage of the high-rate core group (e.g., 5V) and the upper charge limit voltage of the low-rate cells (e.g., 4.4V) are different), then in the case where the voltage of the high-rate core group and the voltage of the low-rate cells both reach the preset voltage (e.g., 4.4V), the charging is completed, and thus the charging may be referred to as direct charging.
In another embodiment, the preset voltage (e.g., 4.25V) may be smaller than the upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells (in the case where the upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells are the same, e.g., 4.4V), or the preset voltage (e.g., 4.25V) may be smaller than the minimum upper charge limit voltage of the high-rate core group and the upper charge limit voltage of the low-rate cells (in the case where the upper charge limit voltage of the high-rate core group (e.g., 5V) and the upper charge limit voltage of the low-rate cells (e.g., 4.4V)), and then, in the case where the voltage of the high-rate core group and the voltage of the low-rate cells both reach the preset voltage (e.g., 4.25V), the preset current (e.g., 5A) smaller than the maximum charge current (e.g., 10A) is continuously applied to the high-rate core group and the low-rate cells according to the above-described current distribution method The core charging is performed until the voltage of the high-rate cell group or the voltage of the low-rate cell reaches the charging upper limit voltage (e.g., 4.4V), by which the charging is completed, and the charging thus completed may be referred to as step charging.
According to an embodiment of the present disclosure, the discharging the lithium ion battery according to the obtained discharge instruction and according to the temperature of the lithium ion battery includes: tlu ═ Thu, Thl < Tll, when Tll ≦ T ≦ Tlu, the high-rate core group is discharged and the low-rate cells are discharged, when Thl ≦ T ≦ Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower-limit discharge temperature of the low-rate cells, Tlu represents the upper-limit discharge temperature of the low-rate cells, Thl represents the lower-limit discharge temperature of the high-rate core group, and Thu represents the upper-limit discharge temperature of the high-rate core group.
In this embodiment, preferably, Tll ≦ 0 ℃, tliu ≦ 55 ℃, Thl ≦ 40 ℃, when T ≦ 0 ≦ 55 ℃, both the high-rate core and the low-rate cells are discharged, and when T ≦ 40 ≦ 0 ℃, the high-rate core is discharged and the low-rate cells are not discharged.
According to the embodiment, the use temperature of the lithium ion battery can be expanded, so that the terminal is suitable for more extreme environments.
According to the embodiment of the disclosure, when the discharge current of the lithium ion battery is smaller than a preset value, and when the voltage of the high-rate cell group is in a preset voltage segment and the voltage of the low-rate cell is in a preset voltage segment, the high-rate cell group charges the low-rate cell.
In this embodiment, for example, when the discharge current of the lithium ion battery is less than 50mA, and when the voltage of the high-rate cell group is greater than 3.8V and less than 4.4V and the voltage of the low-rate cells is greater than 3.73V and less than 3.97V, the high-rate cell group charges the low-rate cells.
According to the embodiment, under appropriate conditions, the high-rate lithium ion battery core group can charge the low-rate battery core, so that the low-rate battery core is in a good state, and the charging time is shortened when the lithium ion battery is integrally charged.
The embodiment of the disclosure also provides a charge and discharge control device of the lithium ion battery.
It can be understood that, in order to implement the above functions, the lithium ion battery charging and discharging control device provided in the embodiments of the present disclosure includes a hardware structure and/or a software module corresponding to each function. The disclosed embodiments can be implemented in hardware or a combination of hardware and computer software, in combination with the exemplary elements and algorithm steps disclosed in the disclosed embodiments. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The embodiment discloses a charging and discharging control device of a lithium ion battery. The device is applied to the terminal. The lithium ion battery comprises a high-rate battery core group and a low-rate battery core, wherein the high-rate battery core group is connected with the low-rate battery core in parallel, the high-rate battery core group comprises a plurality of high-rate battery cores connected in series, and the charging rate of the high-rate battery core is larger than that of the low-rate battery core. The apparatus is adapted to perform the steps in the above-described method embodiments.
Referring to fig. 3, fig. 3 is a block diagram illustrating a charge and discharge control apparatus for a lithium ion battery according to an exemplary embodiment. As shown in fig. 3, the lithium ion battery charge/discharge control apparatus 100 includes an acquisition unit 101 and a charge/discharge unit 102. The acquisition unit 101 is configured to acquire a charge and discharge instruction for the lithium ion battery. The charging and discharging unit 102 is configured to preferentially charge the high-rate cell group according to the acquired charging instruction or discharge the lithium ion battery according to the acquired discharging instruction and according to the temperature of the lithium ion battery.
On the other hand, the charging and discharging unit 102 is configured to preferentially charge the high-rate cell group according to the acquired charging instruction in the following manner: and adjusting the charging current of the high-rate battery core group and the low-rate battery core according to the voltage of the high-rate battery core group and the voltage of the low-rate battery core so as to ensure that the high-rate battery core group is charged preferentially.
In yet another aspect, the charging and discharging unit 102 is configured to adjust the charging current to the high-rate battery core group and the low-rate battery cells according to the voltage of the high-rate battery core group and the voltage of the low-rate battery cells in such a way as to ensure that the high-rate battery core group is charged preferentially: when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
In yet another aspect, the charging and discharging unit 102 is configured to discharge the lithium ion battery according to the acquired discharging instruction and according to the temperature of the lithium ion battery in the following manner: tlu ═ Thu, Thl < Tll, when Tll ≦ T ≦ Tlu, the high-rate core group is discharged and the low-rate cells are discharged, when Thl ≦ T ≦ Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower-limit discharge temperature of the low-rate cells, Tlu represents the upper-limit discharge temperature of the low-rate cells, Thl represents the lower-limit discharge temperature of the high-rate core group, and Thu represents the upper-limit discharge temperature of the high-rate core group.
In another aspect, when the discharging current of the lithium ion battery is smaller than a preset value, and when the voltage of the high-rate cell group is in a preset voltage segment and the voltage of the low-rate cell is in a preset voltage segment, the high-rate cell group charges the low-rate cell
It will be appreciated that with respect to the apparatus in the above embodiments, the specific manner in which the respective units perform operations has been described in detail in relation to the embodiments of the method and will not be elaborated upon here.
The disclosed embodiment also provides a lithium ion battery charging and discharging control device, and fig. 4 is a block diagram illustrating another lithium ion battery charging and discharging control device 400 according to an exemplary embodiment. For example, the apparatus 400 may be a mobile phone, a computer, a tablet device, a personal digital assistant, and the like.
Referring to fig. 4, the apparatus 400 may include one or more of the following components: processing component 402, memory 404, power component 406, multimedia component 408, audio component 410, input/output (I/O) interface 412, sensor component 414, and communication component 416.
The processing component 402 generally controls overall operation of the apparatus 400, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 402 can include one or more modules that facilitate interaction between the processing component 402 and other components. For example, the processing component 402 can include a multimedia module to facilitate interaction between the multimedia component 408 and the processing component 402.
The memory 404 is configured to store various types of data to support the operation of the apparatus 400. Examples of such data include instructions for any application or method operating on the device 400, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 404 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 408 includes a screen that provides an output interface between the device 400 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 400 is in an operational mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 410 is configured to output and/or input audio signals. For example, audio component 410 includes a Microphone (MIC) configured to receive external audio signals when apparatus 400 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 404 or transmitted via the communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.
The I/O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 414 includes one or more sensors for providing various aspects of status assessment for the apparatus 400. For example, the sensor assembly 414 may detect an open/closed state of the apparatus 400, the relative positioning of components, such as a display and keypad of the apparatus 400, the sensor assembly 414 may also detect a change in position of the apparatus 400 or a component of the apparatus 400, the presence or absence of user contact with the apparatus 400, orientation or acceleration/deceleration of the apparatus 400, and a change in temperature of the apparatus 400. The sensor assembly 414 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 416 is configured to facilitate wired or wireless communication between the apparatus 400 and other devices. The apparatus 400 may access a wireless network based on a communication standard, such as WiFi, 3G or 4G, or a combination thereof. In an exemplary embodiment, the communication component 416 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 400 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 404 comprising instructions, executable by the processor 420 of the apparatus 400 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The embodiment of the present disclosure also provides a non-transitory computer-readable storage medium, and when instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to execute the lithium ion battery charging and discharging control method according to the embodiment.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (12)
1. A lithium ion battery is characterized in that the lithium ion battery comprises a high-rate battery core group and a low-rate battery core, wherein the high-rate battery core group and the low-rate battery core are connected in parallel, the high-rate battery core group comprises a plurality of high-rate battery cores which are connected in series, the charging rate of a single high-rate battery core is greater than that of a single low-rate battery core, and the high-rate battery core group and the low-rate battery core are electrically connected with a control circuit; the control circuit is used for acquiring a charging instruction for the lithium ion battery;
and adjusting the charging current of the high-rate battery pack and the low-rate battery pack according to the acquired charging instruction, the voltage of the high-rate battery pack and the voltage of the low-rate battery pack so as to ensure that the high-rate battery pack is charged preferentially.
2. The lithium ion battery of claim 1, wherein the lithium ion battery comprises a high-rate cell group and a low-rate cell, the high-rate cell group and the low-rate cell are connected in parallel, and the high-rate cell group is formed by connecting 2 high-rate cells in series.
3. A lithium ion battery charge and discharge control method is characterized in that the method is applied to a terminal, the lithium ion battery comprises a high-rate battery core group and a low-rate battery core, the high-rate battery core group and the low-rate battery core are connected in parallel, the high-rate battery core group comprises a plurality of high-rate battery cores which are connected in series, the charge rate of a single high-rate battery core is greater than that of a single low-rate battery core,
the method comprises the following steps:
acquiring a charging instruction for the lithium ion battery;
and according to the acquired charging instruction, the voltage of the high-rate battery cell group and the voltage of the low-rate battery cell, adjusting the charging current of the high-rate battery cell group and the low-rate battery cell to ensure that the high-rate battery cell group is charged preferentially, or according to the acquired discharging instruction, and according to the temperature of the lithium ion battery, discharging the lithium ion battery.
4. The lithium ion battery charge and discharge control method according to claim 3, wherein the adjusting the charging currents to the high-rate battery core group and the low-rate battery cells according to the voltage of the high-rate battery core group and the voltage of the low-rate battery cells to ensure that the high-rate battery core group is charged preferentially comprises:
when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum charging current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
5. The lithium ion battery charge and discharge control method according to claim 3, wherein the discharging the lithium ion battery according to the obtained discharge instruction and according to the temperature of the lithium ion battery comprises: tlu = Thu, Thl < Tll, when T < Tll, the high-rate core group is discharged and the low-rate cells are discharged, when T < Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower discharge limit temperature of the low-rate cells, Tlu represents the upper discharge limit temperature of the low-rate cells, Thl represents the lower discharge limit temperature of the high-rate core group, and Thu represents the upper discharge limit temperature of the high-rate core group.
6. The lithium ion battery charge-discharge control method according to claim 5, wherein the high-rate cell group charges the low-rate cells when a discharge current of the lithium ion battery is smaller than a preset value and when a voltage of the high-rate cell group is in a preset voltage section and a voltage of the low-rate cells is in another preset voltage section.
7. A charging and discharging control device of a lithium ion battery is characterized in that the device is applied to a terminal, the lithium ion battery comprises a high-rate battery core group and a low-rate battery core, the high-rate battery core group and the low-rate battery core are connected in parallel, the high-rate battery core group comprises a plurality of high-rate battery cores which are connected in series, the charging rate of a single high-rate battery core is greater than that of a single low-rate battery core,
the device comprises:
an acquisition unit configured to acquire a charging instruction for the lithium ion battery;
and the charging and discharging unit is configured to adjust charging currents to the high-rate battery core group and the low-rate battery core according to the acquired charging instruction, the voltage of the high-rate battery core group and the voltage of the low-rate battery core so as to ensure that the high-rate battery core group is charged preferentially, or discharge the lithium ion battery according to the acquired discharging instruction and the temperature of the lithium ion battery.
8. The lithium ion battery charge and discharge control device of claim 7, wherein the charge and discharge unit is configured to adjust the charge current to the high-rate core group and the low-rate cells according to the voltage of the high-rate core group and the voltage of the low-rate cells in such a way as to ensure that the high-rate core group is charged preferentially: when the voltage of the high-rate battery core group and the voltage of the low-rate battery core are smaller than a preset voltage, the lithium ion battery is charged by a maximum charging current, when the maximum charging current is larger than the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the upper limit charging current of the high-rate battery core group, the low-rate battery core is charged by the current obtained by subtracting the upper limit charging current of the high-rate battery core group from the maximum charging current, and when the maximum charging current is smaller than or equal to the upper limit charging current of the high-rate battery core group, the high-rate battery core group is charged by the maximum charging current.
9. The lithium ion battery charge and discharge control device according to claim 7, wherein the charge and discharge unit is configured to discharge the lithium ion battery in accordance with the acquired discharge instruction and in accordance with the temperature of the lithium ion battery, in such a manner that: tlu = Thu, Thl < Tll, when T < Tll, the high-rate core group is discharged and the low-rate cells are discharged, when T < Tll, the high-rate core group is discharged and the low-rate cells are not discharged, wherein T represents the temperature of the lithium ion battery, Tll represents the lower discharge limit temperature of the low-rate cells, Tlu represents the upper discharge limit temperature of the low-rate cells, Thl represents the lower discharge limit temperature of the high-rate core group, and Thu represents the upper discharge limit temperature of the high-rate core group.
10. The lithium ion battery charge and discharge control device according to claim 9, wherein the high-rate cell group charges the low-rate cells when a discharge current of the lithium ion battery is smaller than a preset value, and when a voltage of the high-rate cell group is in a preset voltage section and a voltage of the low-rate cells is in another preset voltage section.
11. A lithium ion battery charge and discharge control device, the device comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: the method for controlling the charging and discharging of a lithium ion battery according to any one of claims 3 to 6 is performed.
12. A non-transitory computer-readable storage medium, wherein instructions, when executed by a processor of a mobile terminal, enable the mobile terminal to perform the lithium ion battery charge and discharge control method of any of claims 3 to 6.
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