CN111490300A - Control device, battery module, and electric vehicle - Google Patents
Control device, battery module, and electric vehicle Download PDFInfo
- Publication number
- CN111490300A CN111490300A CN202010026422.1A CN202010026422A CN111490300A CN 111490300 A CN111490300 A CN 111490300A CN 202010026422 A CN202010026422 A CN 202010026422A CN 111490300 A CN111490300 A CN 111490300A
- Authority
- CN
- China
- Prior art keywords
- secondary battery
- strain
- load
- control device
- soc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008859 change Effects 0.000 claims abstract description 64
- 238000007599 discharging Methods 0.000 claims abstract description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical group [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 9
- 229910001416 lithium ion Inorganic materials 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 description 18
- 238000012545 processing Methods 0.000 description 12
- 230000006399 behavior Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/16—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
-
- 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
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The present invention relates to a control device, including: an acquisition unit that acquires measured values of load or strain at a plurality of positions on a predetermined surface of a frame of a secondary battery; and a control unit that controls charging and discharging of the secondary battery based on a change in the load or the strain with respect to a charging rate of the secondary battery at each of the plurality of positions.
Description
Technical Field
The invention relates to a control device, a battery module, and an electric vehicle.
Background
Conventionally, there is known a configuration in which a surface pressure distribution sensor is provided between lithium ion secondary batteries constituting a battery pack, and whether lithium is deposited or not and a deterioration state of the lithium ion secondary batteries are detected based on a measurement value of the surface pressure distribution sensor (for example, see patent document 1).
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-020826
Disclosure of Invention
Summary of The Invention
Problems to be solved by the invention
It is known that the State Of a lithium ion secondary battery has an in-plane distribution Of SOC (State Of Charge; State Of Charge) and SOH (State Of Health) due to a current density distribution caused by the structure Of an electrode, such as an individual difference in the thickness Of the electrode. On the other hand, since the conventional SOC estimation method based on OCV (Open Circuit Voltage) -SOC characteristics is a method of averaging and grasping the entire electrodes having SOC distribution, it is not possible to manage SOC and SOH locally at the electrodes.
The present invention has been made in view of such circumstances, and an object thereof is to provide a control device, a battery module, and an electric vehicle that can determine a local state of an electrode and perform charge/discharge control in accordance with the determined state.
Means for solving the problems
The control device, the battery module, and the electric vehicle according to the present invention have the following configurations.
(1): a control device according to an aspect of the present invention includes: an acquisition unit that acquires measured values of load or strain at a plurality of positions on a predetermined surface of a frame of a secondary battery; and a control unit that controls charging and discharging of the secondary battery based on a change in the load or the strain with respect to a charging rate of the secondary battery at each of the plurality of positions.
(2): in the aspect of the above (1), the measured values of the load or the strain at the plurality of positions are values measured by a pressure distribution sensor disposed in contact with a frame of the secondary battery.
(3): in the aspect (2) described above, the control device further includes a calculation unit that calculates an amount of change in the load or the strain with respect to the charging rate for each of the detection elements of the pressure distribution sensor.
(4): in the aspect (2) described above, the control device further includes a calculation unit that integrates the load or the strain for each set including a plurality of detection elements of the pressure distribution sensor to calculate an amount of change in the load or the strain with respect to the charging rate.
(5): in the aspects (1) to (4) described above, the change in the load or the strain is a difference in the respective electric quantities of the load or the strain, or a difference in the respective charging rates of the load or the strain.
(6): in the aspects (1) to (5), the control unit controls at least one of a current, a voltage, and an electric power during charging and discharging of the secondary battery.
(7): in the aspects (1) to (6), the control device further includes a determination unit that determines a state of the secondary battery based on a change in the load or the strain.
(8): in the aspect (7) described above, the determination unit determines the state of the secondary battery based on a difference in increasing tendency of the change in the load or the strain.
(9): in the aspects (1) to (8) above, the secondary battery is a lithium ion battery.
(10): in the aspects (1) to (9) described above, when the secondary battery is an assembled battery, the acquisition unit acquires a measured value of the load or the strain of a cell having a highest temperature among a plurality of cells included in the assembled battery.
(11): a battery module according to an aspect of the present invention includes: a secondary battery; a pressure sensor disposed in contact with a housing of the secondary battery; and a control device that controls charging and discharging of the secondary battery, the control device including: an acquisition unit that acquires measured values of load or strain at a plurality of positions on a predetermined surface of a housing of the secondary battery, the measured values being measured by the pressure sensor; and a control unit that controls charging and discharging of the secondary battery based on a change in the load or the strain with respect to a charging rate of the secondary battery at each of the plurality of positions.
(12): an electric vehicle according to an aspect of the present invention includes the battery module of (11) above.
Effects of the invention
According to (1) to (12), the local state of the electrode can be determined, and charge/discharge control can be performed in accordance with the determined state. By performing the control of the current, voltage, and power based on the determined state by the charge/discharge control, it is possible to perform the control according to the local deterioration state of the secondary battery. Further, battery control based on the distribution (maximum/minimum SOC, maximum/minimum negative electrode degradation rate) in the electrode surface of the wound body or the laminated body can be performed.
Drawings
Fig. 1 is a diagram showing an example of the configuration of a charge and discharge control system S according to the first embodiment.
Fig. 2 is a diagram showing an example of the structure of the surface pressure distribution sensor 3 according to the first embodiment.
Fig. 3 is a graph showing the relationship between the interlayer distance of graphite used as the negative electrode material and the SOC in the first embodiment.
Fig. 4 is a graph showing the relationship between the strain and the SOC at the negative electrode and a graph showing the relationship between the strain power difference d/dQ and the SOC in the first embodiment.
Fig. 5 is a graph showing the relationship between the load F and the SOC at the negative electrode and a graph showing the relationship between the electric quantity difference dF/dQ and the SOC of the load F in the first embodiment.
Fig. 6 is a graph comparing the amounts of change in strain of the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the battery capacity deterioration state in the first embodiment.
Fig. 7 is a graph comparing the amount of change in the load F between the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the battery capacity deterioration state in the first embodiment.
Fig. 8 is a graph comparing the amounts of change in strain of the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the stepwise deviation state in the first embodiment.
Fig. 9 is a graph comparing the amount of change in the load F of the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the stepwise deviated state in the first embodiment.
Fig. 10 is a flowchart showing an example of processing by the ECU1 according to the first embodiment.
Fig. 11 is a diagram illustrating the set values of the discharge allowable power according to the first embodiment.
Fig. 12 is a flowchart showing an example of processing by the ECU1 in the second embodiment.
Fig. 13 is a diagram showing a relationship between SOC calculated for each cluster and the amount of change in load F according to the second embodiment.
Description of the reference numerals
1 … ECU, 2 … nonaqueous secondary battery, 3 … surface pressure distribution sensor, 4 … frame binding bar, 5 … current sensor, 6 … voltage sensor, 7 … output unit, 10 … control unit, 12 … storage unit, 20 … acquisition unit, 21 … charge power calculation unit, 22 … SOC calculation unit, 23 … variation calculation unit, 24 … state determination unit, 25 … charge-discharge control unit, 26 … report unit
Detailed Description
Embodiments of a control device, a battery module, and an electric vehicle according to the present invention will be described below with reference to the drawings. The control device of the present invention is mounted on, for example, an electric vehicle, and controls a nonaqueous secondary battery of the electric vehicle. The control device of the present invention is not limited to this, and may be mounted on various devices using a nonaqueous secondary battery as a power source.
< first embodiment >
Fig. 1 is a diagram showing an example of the configuration of a charge and discharge control system S according to the first embodiment. The charge/discharge Control system S includes, for example, an ecu (electronic Control unit)1 (Control device), a nonaqueous secondary battery 2 (an example of a secondary battery), a surface pressure distribution sensor 3 (an example of a pressure distribution sensor), a frame binding bar 4, a current sensor 5, a voltage sensor 6, and an output unit 7.
The nonaqueous secondary battery 2 is, for example, a lithium ion battery having a positive electrode and a negative electrode. The nonaqueous secondary battery 2 is a battery of a square shape, a laminate type, a circular shape, or the like. The positive electrode and the negative electrode of the nonaqueous secondary battery 2 are connected to the ECU1 via electric wires, respectively.
The surface pressure distribution sensor 3 is disposed in contact with one surface of the housing of the nonaqueous secondary battery 2. The surface pressure distribution sensor 3 measures the surface pressure distribution of the contact surface with the nonaqueous secondary battery 2. Fig. 2 is a diagram showing an example of the structure of the surface pressure distribution sensor 3 according to the first embodiment. As shown in fig. 2, the surface pressure distribution sensor 3 includes a plurality of pressure sensor elements 30 (hereinafter, also referred to as "pixels") (an example of a detection element). The plurality of pressure sensor elements 30 detect pressures acting on the respective elements, i.e., loads per unit area. The surface pressure distribution sensor 3 is disposed such that the detection surface of the pressure sensor element 30 described above is in contact with one surface of the housing of the nonaqueous secondary battery 2. The surface pressure distribution sensor 3 outputs the measurement values measured by the plurality of pressure sensor elements 30 to the ECU1 via the input/output unit 32. For example, the surface pressure distribution sensor 3 is disposed in the battery case by a lamination method of a jelly-roll or a laminate of rectangular lithium ion batteries.
The frame binding bar 4 fixes the detected surface of the nonaqueous secondary battery 2 and the detection surface of the pressure sensor element 30 of the surface pressure distribution sensor 3 in a contact state. The frame binding bar 4 includes, for example, a first base material 4a and a second base material 4b which are arranged to face each other. The first base material 4a and the second base material 4b are connected by connecting members 4c, 4 d. The frame binding bar 4 is fixed by the connecting members 4c and 4d in a state where the nonaqueous secondary battery 2 and the surface pressure distribution sensor 3 are sandwiched between the first base material 4a and the second base material 4 b.
The current sensor 5 is connected to an electric power line connecting the nonaqueous secondary battery 2 and the drive unit side. The current sensor 5 detects a current value of electric power discharged by the nonaqueous secondary battery 2 and a current value of electric power charged in the nonaqueous secondary battery 2, and outputs the detected values to the ECU 1.
The voltage sensor 6 is connected to an electric wire connecting the nonaqueous secondary battery 2 and the ECU 1. The voltage sensor 6 detects voltages of electric wires connected to the positive electrode and the negative electrode of the nonaqueous secondary battery 2, respectively, and outputs the detected voltages to the ECU 1.
The ECU1 determines the state of the nonaqueous secondary battery 2, and performs charge and discharge control of the nonaqueous secondary battery 2 based on the determined state. Details of the structure of the ECU1 will be described later.
[ Structure of ECU1 ]
The ECU1 includes, for example, a control unit 10 and a storage unit 12, the control unit 10 includes, for example, an acquisition unit 20, a charge amount calculation unit 21, an SOC calculation unit 22, a change amount calculation unit 23 (calculation unit), a state determination unit 24 (determination unit), a charge/discharge control unit 25 (control unit), and a report unit 26, and the constituent elements of the control unit 10 are realized by, for example, a computer processor execution program (software) such as a cpu (central Processing unit), and some or all of the constituent elements of the control unit 10 may be realized by hardware (including a circuit unit) such as L SI (L area Scale) or asic application Specific integrated circuit), an FPGA (Field-Programmable Gate Array), a gpu (graphics Processing unit), or may be realized by cooperation of software and hardware, and the program may be stored in the storage unit 12 in advance, or may be installed in a storage medium such as a DVD or a CD-ROM, and installed in a storage device 12.
The acquisition unit 20 acquires pressure values measured by the pressure sensor elements 30 of the surface pressure distribution sensor 3, current values measured by the current sensor 5, voltage values measured by the voltage sensor 6, and the like. The acquisition unit 20 associates the pressure values acquired from the surface pressure distribution sensor 3 with the time information, and stores the pressure values in the storage unit 12 as the surface pressure distribution information 12A. The acquisition unit 20 associates the acquired current value and voltage value with the time information, and stores the current value and voltage value in the storage unit 12 as current-voltage information 12B.
The charged electric energy calculating unit 21 calculates the amount of charged electric energy to be charged in the nonaqueous secondary battery 2 based on the current value and the voltage value acquired by the acquiring unit 20. The charging amount calculation unit 21 associates the calculated amount of charging power with the time information at the time of charging, and stores the information in the storage unit 12 as charging amount information 12C. The charged electric energy calculation unit 21 may calculate the amount of discharge electric energy discharged from the nonaqueous secondary battery 2 based on the current value and the voltage value acquired by the acquisition unit 20.
The SOC calculating unit 22 calculates the SOC (state of charge) of the nonaqueous secondary battery 2 based on, for example, the current integration, the R L S method, and the like, for example, the SOC calculating unit 22 calculates the SOC of the nonaqueous secondary battery based on the capacity of the nonaqueous secondary battery 2, the initial SOC, and the current value of the electric power charged/discharged to the nonaqueous secondary battery 2, the capacity of the nonaqueous secondary battery 2 being the amount of electric power discharged from the nonaqueous secondary battery 2 (current × time) [ Ah ] from a certain state of charge of the nonaqueous secondary battery 2 to a discharge end voltage, the initial SOC being the detected value detected by the current sensor 5.
The change amount calculation unit 23 calculates characteristic information that can be used for determining the state of the nonaqueous secondary battery 2. In general, it is known that the positive electrode and the negative electrode of the nonaqueous secondary battery 2 swell due to charging. For example, graphite used for the negative electrode has a higher expansion ratio than that of the positive electrode. Therefore, the expansion of the nonaqueous secondary battery 2 due to the charging can be considered to be the expansion due to the negative electrode.
FIG. 3 is a graph showing the relationship between the SOC and the interlayer distance of graphite used as a negative electrode material, and as shown in FIG. 3, the interlayer distance of graphite increases with the increase in SOC, that is, with L i introduced into the structure of graphite, and here, the interlayer distance of graphite increases with SOC (corresponding to L i)xC6X) is not linearly increased but shows discontinuous increasing behavior corresponding to a stage structure. In the example shown in fig. 3, there are 3 stages (stages 1 to 3) in which the increasing tendency of the interlayer distance is different, that is, the slopes of the interlayer distance with respect to the SOC are different from each other. The state (stage) of the negative electrode can be estimated by monitoring the expansion of the nonaqueous secondary battery 2 caused by the expansion of the negative electrode during such charging or the change in the load applied to and detected by the surface pressure distribution sensor 3 according to the expansion.
Therefore, the change amount calculation unit 23 calculates the expansion (strain) of the negative electrode of the nonaqueous secondary battery 2 using the pressure value of the surface pressure distribution sensor 3 acquired by the acquisition unit 20 at the time of charging the nonaqueous secondary battery 2, and calculates the electric energy difference d/dQ of the calculated strain. Fig. 4 is a graph showing a relationship between strain and SOC at the negative electrode and a graph showing a relationship between the amount difference d/dQ of strain and SOC. The example shown in fig. 4 corresponds to the case where the increasing tendency of the interlayer distance with respect to the SOC includes 3 steps as shown in fig. 3. As shown in fig. 4, as the SOC increases, the strain at the negative electrode shows a discontinuous increasing behavior corresponding to the 3-stage structure. When the electric quantity difference d/dQ of strain showing discontinuous increasing behavior according to the 3 stage structures is calculated, values associated with the 3 stage structures can be obtained, respectively. By calculating the electric energy difference d/dQ, it is possible to discriminate between a region where the amount of change in strain is large and a region where the amount of change in strain is small, and estimate the inside of the negative electrode.
When the elastic constant E of the nonaqueous secondary battery 2 is assumed to be constant, the change amount calculation unit 23 may substitute the relationship between the strain and the SOC as shown in fig. 4 for the relationship between the load F and the SOC, and estimate the state of the negative electrode from the electric quantity difference dF/dQ of the load F, because the stress σ (load F/area S) is proportional to the strain. Fig. 5 is a graph showing a relationship between the load F and the SOC at the negative electrode and a graph showing a relationship between the electric quantity difference dF/dQ and the SOC of the load F. As shown in fig. 5, the load F at the negative electrode exhibits a discontinuous increasing behavior corresponding to the 3-stage structure as the SOC increases. When the electric quantity difference dF/dQ of the load F showing discontinuous increasing behaviors corresponding to the 3 stage structures is calculated, values associated with the 3 stage structures respectively can be obtained. By calculating the electric energy difference dF/dQ, it is possible to discriminate between a region where the amount of change in the load F is large and a region where the amount of change in the load F is small, and to estimate the state of the negative electrode.
The change amount calculation unit 23 may calculate an index value indicating the state of charge, such as d/dSOC or dF/dSOC, which is the amount of change in the difference between the strain or the load F and the SOC.
The state determination unit 24 determines the state of the nonaqueous secondary battery 2 based on the amount of change in strain or the amount of change in the load F calculated by the change amount calculation unit 23. For example, the state determination unit 24 determines the capacity deterioration state, the step-off state (ステージずれ - ), and the like of the nonaqueous secondary battery 2.
(determination of Capacity deterioration State)
The nonaqueous secondary battery has a reduced capacity due to aged deterioration or the like. The state determination unit 24 determines that the capacity of the nonaqueous secondary battery is decreased. Fig. 6 is a graph comparing the amount of change in strain between a nonaqueous secondary battery in a reference state and a nonaqueous secondary battery in a state of deteriorated battery capacity. The reference state is a state in which it is assumed that the soundness of the nonaqueous secondary battery is ensured (a state in which the nonaqueous secondary battery is not deteriorated). The reference state includes, for example, an initial state before use of the nonaqueous secondary battery. Also, the amount of change in the strain or load in the reference state may be an average of the strains or loads based on the measured values of the plurality of pixels. In fig. 6, in order to facilitate observation of the difference in behavior between the coordinate graph of the nonaqueous secondary battery in the reference state and the coordinate graph of the nonaqueous secondary battery in the capacity deterioration state, the vertical axis (strain) of the coordinate graph of the nonaqueous secondary battery in the capacity deterioration state is shown offset. In fig. 6, the state of the negative electrode of the nonaqueous secondary battery in the reference state is represented by stages 1 to 3, and the state of the negative electrode of the nonaqueous secondary battery in the capacity deterioration state is represented by stages 1A to 3A. When the capacity of the negative electrode decreases, the amount of change in the charge depth of the negative electrode increases for the same SOC. Therefore, as shown in fig. 6, the SOC is the width of stage 2A of the nonaqueous secondary battery in the capacity deterioration state, that is, the SOC, as compared with stage 2 of the nonaqueous secondary battery in the reference statestg2A[Ah]The Δ SOC1, Δ SOC2, or Δ Q1, Δ Q2 are narrowed on the switching point side with phase 1A and the switching point side with phase 3A, respectively. I.e., the width of stage 2A, i.e., SOCstg2A[Ah]Narrowing Δ SOC1+ Δ SOC2 (or Δ Q1+ Δ Q2). Conventionally, when a strain or a load is simply measured, the absolute value of the strain or the load fluctuates due to a deterioration state, a temperature, and the like, and therefore, the strain or the load cannot be used for the estimation at the above stage. On the other hand, the state determination unit 24 of the present embodiment can detect the capacity decrease of the negative electrode based on the tendency described above。
Fig. 7 is a graph comparing the amount of change in the load F between the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the battery capacity deterioration state. In fig. 7, in order to facilitate observation of the difference in behavior between the coordinate graph of the nonaqueous secondary battery in the reference state and the coordinate graph of the nonaqueous secondary battery in the capacity deterioration state, the vertical axis (load) of the coordinate graph of the nonaqueous secondary battery in the capacity deterioration state is shown as being offset. In fig. 7, the stages of the nonaqueous secondary battery in the reference state are represented by stages 1 to 3, and the stages of the nonaqueous secondary battery in the capacity deterioration state are represented by stages 1A to 3A. When the capacity of the negative electrode deteriorates, the amount of change in the charge depth of the negative electrode increases for the same SOC. Therefore, as shown in fig. 7, the SOC is the width of stage 2A of the nonaqueous secondary battery in the capacity deterioration state, that is, the SOC, as compared with stage 2 of the nonaqueous secondary battery in the reference statestg2A[Ah]The Δ SOC1, Δ SOC2, or Δ Q1, Δ Q2 are narrowed on the switching point side with phase 1A and the switching point side with phase 3A, respectively. I.e., the width of stage 2A, i.e., SOCstg2A[Ah]Narrowing Δ SOC1+ Δ SOC2 (or Δ Q1+ Δ Q2). The state determination unit 24 can detect the decrease in the capacity of the negative electrode based on this tendency.
For example, the state determination unit 24 determines the SOC of the switching point between the phase 1(1A) and the phase 2(2A) and the SOC of the switching point between the phase 2(2A) and the phase 3(3A) in order to detect the width of the phase 2.
(determination of stage deviation State)
The nonaqueous secondary battery may have a deviation in SOC-step relationship (hereinafter, also referred to as "step deviation") due to a deviation in N/P ratio or the like. The state determination unit 24 determines such a phase shift of the nonaqueous secondary battery. Fig. 8 is a graph comparing the amount of change in strain between a nonaqueous secondary battery in a reference state and a nonaqueous secondary battery in an off-step state. In fig. 8, in order to facilitate observation of the difference in behavior between the coordinate graph of the nonaqueous secondary battery in the reference state and the coordinate graph of the nonaqueous secondary battery in the stepwise deviated state, the ordinate (strain) of the coordinate graph of the nonaqueous secondary battery in the stepwise deviated state is shown as being deviated. In fig. 8, stages of the nonaqueous secondary battery in the reference state are represented by stages 1 to 3, and stages of the nonaqueous secondary battery in the step-out state are represented by stages 1B to 3B. As shown in fig. 8, the position of the stepwise change of the non-aqueous secondary battery in the stepwise deviated state (the position of the stepwise change from the stage 3B to the stage 2B, and the position of the stepwise change from the stage 2B to the stage 1B) is deviated by Δ SOC% from the non-aqueous secondary battery in the reference state. The state determination unit 24 can detect the phase shift based on the presence or absence of the shift.
Fig. 9 is a graph comparing the amount of change in the load F of the nonaqueous secondary battery in the reference state and the nonaqueous secondary battery in the stepwise deviated state. In fig. 9, in order to facilitate observation of the difference in behavior between the coordinate graph of the nonaqueous secondary battery in the reference state and the coordinate graph of the nonaqueous secondary battery in the stepwise deviated state, the vertical axis (load) of the coordinate graph of the nonaqueous secondary battery in the stepwise deviated state is shown as being deviated. In fig. 9, stages of the nonaqueous secondary battery in the reference state are represented by stages 1 to 3, and stages of the nonaqueous secondary battery in the step-out state are represented by stages 1B to 3B. As shown in fig. 9, the position of the stepwise change of the non-aqueous secondary battery in the stepwise deviated state (the position changed from the stage 3B to the stage 2B, and the position changed from the stage 2B to the stage 1B) is deviated by Δ SOC% from the non-aqueous secondary battery in the reference state. The state determination unit 24 can detect the phase shift based on the presence or absence of the shift.
For example, in order to detect the presence or absence of the deviation, state determination unit 24 determines the SOC at the switching point between stage 1(1B) and stage 2(2B) and the SOC at the switching point between stage 2(2B) and stage 3 (3B).
The charge/discharge control unit 25 controls the charge/discharge of the nonaqueous secondary battery 2 based on the state of the nonaqueous secondary battery determined by the state determination unit 24. For example, during the charging control, the charging/discharging control unit 25 changes the reference value of the SOC used for setting the charge allowable power, which is the upper limit value of the available power, the charge allowable voltage, which is the upper limit value of the available voltage, and the charge allowable current, which is the upper limit value of the available current, based on the Δ SOC%. For example, during the discharge control, the charge/discharge control unit 25 changes the reference value of SOC used for setting the discharge allowable power, which is the upper limit value of the available power, the discharge allowable voltage, which is the upper limit value of the available voltage, and the discharge allowable current, which is the upper limit value of the available current, based on the Δ SOC%.
The reporting unit 26 controls the output unit 7 to report the determination result of the state determination unit 24 and information related to the change of the control content of the charge/discharge control unit 25. The output unit 7 is, for example, a display, a speaker, or the like provided in the vehicle. For example, the reporting unit 26 displays a message or a video on the display, the message or the video reporting that the capacity of the nonaqueous secondary battery 2 is deteriorated or the condition (reference value of SOC) in the charge/discharge control is changed. The reporting unit 26 may output a message or an error sound from the speaker, the message reporting that the capacity of the nonaqueous secondary battery 2 is deteriorated or the condition (reference value of SOC) during charge/discharge control is changed.
The storage unit 12 is realized by, for example, an hdd (hard Disc drive), a flash memory, an eeprom (electrically erasable Programmable Read Only memory), a rom (Read Only memory), or a ram (random access memory).
(processing of ECU 1)
Fig. 10 is a flowchart showing an example of processing performed by the ECU 1. First, the ignition device of the electric vehicle mounted with the ECU1 is turned on (step S101). Here, a case will be described in which the charging process of the nonaqueous secondary battery 2 is already performed and the information of the surface pressure distribution, the current, and the voltage acquired at the time of charging is stored in the storage unit 12.
Next, the charged electric energy calculating unit 21 calculates the charged electric energy based on the current-voltage information 12B stored in the storage unit 12 (step S103). Here, the charge amount calculation unit 21 calculates the change with time of the charge amount by integrating the charge amount during charging.
Next, the change amount calculation unit 23 calculates the strain or load of the nonaqueous secondary battery 2 for each pressure sensor element 30 (each pixel) based on the surface pressure distribution information 12A stored in the storage unit 12 (step S105). Next, the change amount calculation unit 23 calculates the amount of change in strain or load for each pixel based on the calculated strain or load and the amount of charge calculated by the charge amount calculation unit 21 (S107). The amount of change in the strain or load is, for example, the electrical differential d/dQ of the strain or the electrical differential dF/dQ of the load F.
Next, SOC calculating unit 22 calculates the SOC of nonaqueous secondary battery 2 based on current-voltage information 12B stored in storage unit 12 (step S109). Here, SOC calculating unit 22 calculates a temporal change in SOC during charging. Next, the state determination unit 24 determines the state of the nonaqueous secondary battery 2 based on the amount of change in the strain or the load calculated by the amount-of-change calculation unit 23 and the SOC calculated by the SOC calculation unit 22 (step S111). For example, the state determination unit 24 generates a graph showing a relationship between the SOC and the amount of change in strain or load for each pixel, and determines the SOC at the switching point in the stage. For example, state determination unit 24 determines the SOC at the switching point from phase 1 to phase 2 as shown in fig. 8. Then, state determination unit 24 calculates an average value of the SOC at the switching point of the stage determined for each pixel (hereinafter referred to as "average stage switching point"). The state determination unit 24 calculates the maximum value Δ SOC of the difference between the calculated average phase switching point and the switching point of each pixel, based on the following expression (1), for examplemax。
ΔSOCmaxMax (| phase 1 switching point SOC of each pixel — average phase switching point SOC |) … formula (1)
Next, state determination unit 24 determines the calculated Δ SOCmaxWhether or not the value is equal to or higher than a predetermined threshold value (step S113). When state determination unit 24 determines Δ SOCmaxIf not, the charged electric energy calculation unit 21 calculates the charged electric energy for the other charging (step S103), and repeats the subsequent processes.
When state determination unit 24 determines Δ SOCmaxWhen the voltage is equal to or higher than the threshold value, the charge/discharge control unit 25 controls the charge/discharge of the nonaqueous secondary battery 2 based on the state of the nonaqueous secondary battery determined by the state determination unit 24 (step S115). For example, the charge/discharge control unit 25 updates the reference value SOC of the SOC used for setting the charge allowable power, the charge allowable voltage, and the charge allowable current in the charge control to "SOC + Δ SOCmax". The charge/discharge control unit 25 controls the discharge allowable power, the discharge allowable voltage, and the discharge during the discharge controlThe reference value SOC of the SOC used for setting the electric allowable current is updated to "SOC- Δ SOCmax”。
Fig. 11 is a diagram illustrating the set value of the discharge allowable power. As shown in fig. 11, conventionally, even when the above-described local step deviation of the SOC occurs, the average SOC of the SOC is adopted without considerationaveAs a reference value of the discharge allowable power. On the other hand, in the present embodiment, the SOC of the electrode surface area lower than the average SOC is adopted in consideration of the local SOC calculated from the amount of change of the load F and the like, and the SOC of the electrode surface area lower than the average SOCaveLow "SOCP-ΔSOCmax"as a reference value of the discharge allowable power. This enables charge/discharge control in consideration of the local SOC.
Then, the reporting unit 26 controls the output unit 7 to report, for example, that the settings of the charging allowable power, the charging allowable voltage, and the charging allowable current are changed during the charging control; and a case where the settings of the discharge allowable power, the discharge allowable voltage, and the discharge allowable current in the discharge control are changed (step S117). The processing in the flowchart ends as described above.
According to the first embodiment described above, the local state of the electrode can be determined, and charge/discharge control can be performed in accordance with the determined state.
< second embodiment >
The second embodiment is explained below. The ECU1 of the second embodiment is different from the first embodiment in that the strain or load of the nonaqueous secondary battery 2 is calculated instead of using each of the pressure sensor elements 30 (each pixel) of the plurality of pressure sensor elements 30 of the surface pressure distribution sensor 3, and the plurality of pixels are collectively treated as a cluster (cluster). Therefore, the drawings and related descriptions described in the first embodiment are referred to for the structure and the like, and detailed description is omitted.
(processing of ECU 1)
Fig. 12 is a flowchart showing an example of processing performed by the ECU 1. First, the ignition device of the electric vehicle mounted with the ECU1 is turned on (step S201). Here, a case will be described in which the charging process of the nonaqueous secondary battery 2 is already performed and the information of the surface pressure distribution, the current, and the voltage acquired at the time of charging is stored in the storage unit 12.
Next, the charged electric energy calculating unit 21 calculates the charged electric energy based on the current-voltage information 12B stored in the storage unit 12 (step S203). Here, the charge amount calculation unit 21 calculates the change with time of the charge amount by integrating the charge amount during charging.
Next, the change amount calculation unit 23 clusters the plurality of pixels of the surface pressure distribution sensor 3 based on the surface pressure distribution information 12A stored in the storage unit 12, and calculates the strain or load of the nonaqueous secondary battery 2 for each cluster (step S205). Next, the change amount calculation unit 23 calculates the amount of change in strain or load for each cluster based on the calculated strain or load and the charged electric energy calculated by the charged electric energy calculation unit 21 (S207). The amount of change in strain or load is, for example, the electrical quantity differential d/dQ of the strain or the electrical quantity differential dF/dQ of the load F.
Next, SOC calculating unit 22 calculates the SOC of nonaqueous secondary battery 2 based on current-voltage information 12B stored in storage unit 12 (step S209). Here, SOC calculating unit 22 calculates a temporal change in SOC during charging. Next, the state determination unit 24 determines the state of the nonaqueous secondary battery 2 based on the amount of change in the strain or the load calculated by the amount-of-change calculation unit 23 and the SOC calculated by the SOC calculation unit 22 (step S211). For example, the state determination unit 24 generates a graph showing the relationship between the SOC and the amount of change in strain or load for each cluster, and determines the SOC at the switching point in each stage. Then, the state determination unit 24 calculates an average value of the SOC at the switching point in the stage determined for each cluster (hereinafter referred to as "average stage switching point"). Next, the state determination unit 24 calculates the maximum value Δ SOC of the difference between the calculated average phase switching point and the switching point of each pixel, based on the following expression (1), for examplemax。
ΔSOCmaxMax (| phase 1 switching point SOC-average phase switching point SOC | of each cluster) … formula (1)
Next, state determination unit 24 determines the calculated Δ SOCmaxWhether or not the threshold value is equal to or higher than a predetermined threshold value (step S213). When state determination unit 24 determines Δ SOCmaxIf not, the charged electric energy calculation unit 21 calculates the charged electric energy for the other charging (step S203), and repeats the subsequent processes.
When state determination unit 24 determines Δ SOCmaxWhen the voltage is equal to or higher than the threshold value, the charge/discharge control unit 25 controls the charge/discharge of the nonaqueous secondary battery 2 based on the state of the nonaqueous secondary battery determined by the state determination unit 24 (step S215). For example, the charge/discharge control unit 25 updates the reference value SOC of the SOC used for setting the charge allowable power, the charge allowable voltage, and the charge allowable current in the charge control to "SOC + Δ SOCmax". Then, charge/discharge control unit 25 updates reference value SOC of SOC used for setting discharge allowable power, discharge allowable voltage, and discharge allowable current in discharge control to "SOC- Δ SOCmax”。
Then, the reporting unit 26 controls the output unit 7 to report, for example, that the settings of the charging allowable power, the charging allowable voltage, and the charging allowable current are changed during the charging control; and a case where the settings of the discharge allowable power, the discharge allowable voltage, and the discharge allowable current in the discharge control are changed (step S217). The processing in the flowchart ends as described above.
Fig. 13 is a diagram showing a relationship between SOC and the amount of change in load F calculated for each cluster. Fig. 13 shows an example of a case where a plurality of pixels in the surface pressure distribution sensor 3 are integrated for each row. As shown in fig. 13, it was confirmed that regions (widths D1a and D1b) with reduced widths in stage 2 were present on the can bottom side and the can lid side of the negative electrode after predetermined cycles of the nonaqueous secondary battery 2, as compared with the width D1 in stage 2 of the nonaqueous secondary battery 2. Due to the reduction in the width of the stage 2, it can be estimated that the deterioration of the negative electrode has progressed after the predetermined cycle.
According to the second embodiment described above, the local state of the electrode can be determined, and the charge and discharge control can be performed in accordance with the determined state.
The ECU1 may perform both processing by each pixel and processing by each cluster of the surface pressure distribution sensor 3. When the nonaqueous secondary battery 2 is an assembled battery, a plurality of cells included in the assembled battery may be provided with temperature sensors to measure the temperatures, and a measurement value of the surface pressure distribution of the cell having the highest measured temperature may be obtained and processed. Furthermore, the ECU1 can be applied not only to a lithium ion secondary battery using graphite as a negative electrode, but also to a lithium ion secondary battery in which a silicon-based material is added to graphite.
While the embodiments for carrying out the present invention have been described above, the present invention is not limited to the embodiments, and various modifications and substitutions can be made without departing from the spirit of the present invention.
Claims (12)
1. A control device is provided with:
an acquisition unit that acquires measured values of load or strain at a plurality of positions on a predetermined surface of a frame of a secondary battery; and
a control portion that controls charging and discharging of the secondary battery based on a change in the load or the strain with respect to a charging rate of the secondary battery at each of the plurality of positions.
2. The control device according to claim 1,
measuring the load or the strain at the plurality of positions by a pressure distribution sensor arranged in contact with a frame of the secondary battery.
3. The control device according to claim 2,
the control device further includes a calculation unit that calculates an amount of change in the load or the strain with respect to the charging rate for each of the detection elements of the pressure distribution sensor.
4. The control device according to claim 2,
the control device further includes a calculation unit that integrates the load or the strain for each set of the pressure distribution sensor including the plurality of detection elements to calculate an amount of change in the load or the strain with respect to the charging rate.
5. The control device according to any one of claims 1 to 4,
the change in the load or the strain is a difference in the respective electric quantities of the load or the strain, or a difference in the respective charging rates of the load or the strain.
6. The control device according to any one of claims 1 to 5,
the control unit controls at least one of current, voltage, and electric power during charging and discharging of the secondary battery.
7. The control device according to any one of claims 1 to 6,
the control device further includes a determination unit that determines a state of the secondary battery based on a change in the load or the strain.
8. The control device according to claim 7,
the determination unit determines the state of the secondary battery based on a difference in increasing tendency of the change in the load or the strain.
9. The control device according to any one of claims 1 to 8,
the secondary battery is a lithium ion battery.
10. The control device according to any one of claims 1 to 9,
when the secondary battery is an assembled battery, the acquisition unit acquires a measured value of the load or the strain of a cell having a highest temperature among a plurality of cells included in the assembled battery.
11. A battery module is provided with:
a secondary battery;
a pressure sensor disposed in contact with a housing of the secondary battery; and
a control device that controls charging and discharging of the secondary battery,
the control device is provided with:
an acquisition unit that acquires measured values of load or strain at a plurality of positions on a predetermined surface of a housing of the secondary battery, the measured values being measured by the pressure sensor; and
a control unit that controls charging and discharging of the secondary battery based on a change in the load or the strain with respect to a charging rate of the secondary battery at each of the plurality of positions.
12. An electric vehicle, wherein,
the battery module according to claim 11 is provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-012266 | 2019-01-28 | ||
| JP2019012266A JP7171462B2 (en) | 2019-01-28 | 2019-01-28 | Controllers, battery modules, and electric vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111490300A true CN111490300A (en) | 2020-08-04 |
| CN111490300B CN111490300B (en) | 2023-11-28 |
Family
ID=71812437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010026422.1A Active CN111490300B (en) | 2019-01-28 | 2020-01-10 | Control device, battery module, and electric vehicle |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7171462B2 (en) |
| CN (1) | CN111490300B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11480625B2 (en) * | 2020-03-12 | 2022-10-25 | Wisk Aero Llc | Real-time battery fault detection and state-of-health monitoring |
| JP7468488B2 (en) | 2021-09-24 | 2024-04-16 | トヨタ自動車株式会社 | Charge/discharge control device |
| JP7241946B1 (en) | 2022-03-01 | 2023-03-17 | Ａｐｂ株式会社 | Measuring jig, measuring device, bipolar battery, and method for manufacturing bipolar battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013122907A (en) * | 2011-11-11 | 2013-06-20 | Toyota Motor Corp | Battery system |
| JP2017085735A (en) * | 2015-10-27 | 2017-05-18 | トヨタ自動車株式会社 | Battery system |
| CN108802620A (en) * | 2017-04-27 | 2018-11-13 | 丰田自动车株式会社 | The deterioration year in year out of vehicle-mounted battery system and battery estimates method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9588186B2 (en) | 2012-10-11 | 2017-03-07 | The Trustees Of Princeton University | Mechanical measurement of state of health and state of charge for intercalation batteries |
-
2019
- 2019-01-28 JP JP2019012266A patent/JP7171462B2/en active Active
-
2020
- 2020-01-10 CN CN202010026422.1A patent/CN111490300B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013122907A (en) * | 2011-11-11 | 2013-06-20 | Toyota Motor Corp | Battery system |
| JP2017085735A (en) * | 2015-10-27 | 2017-05-18 | トヨタ自動車株式会社 | Battery system |
| CN108802620A (en) * | 2017-04-27 | 2018-11-13 | 丰田自动车株式会社 | The deterioration year in year out of vehicle-mounted battery system and battery estimates method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020120555A (en) | 2020-08-06 |
| JP7171462B2 (en) | 2022-11-15 |
| CN111490300B (en) | 2023-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3506452B1 (en) | Battery charging method and apparatus | |
| CN104698385B (en) | Battery state calculating device and battery state calculating method | |
| EP3736587B1 (en) | A method and a system for estimation of remaining useful life in lithium based batteries | |
| JP5036662B2 (en) | Secondary battery monitoring device and secondary battery system | |
| US11293988B2 (en) | Method and apparatus with battery state estimation | |
| EP3327456B1 (en) | Method and apparatus for estimating state of battery based on error correction | |
| EP2711727B1 (en) | Battery condition estimation device and method of generating open circuit voltage characteristic | |
| CN111490300B (en) | Control device, battery module, and electric vehicle | |
| US10048319B2 (en) | Estimating of the state of charge of a battery | |
| JP2020507067A (en) | Apparatus and method for acquiring degeneration information of lithium ion battery cell | |
| JP2017122622A (en) | State estimation device and state estimation method | |
| EP3961232B1 (en) | Method and apparatus for battery state estimation | |
| KR102572652B1 (en) | Method for estimating state of charge of battery | |
| JP7326237B2 (en) | Determination device, power storage system, determination method, and determination program for multiple batteries | |
| CN114729969A (en) | Battery state estimating device | |
| JP2013003115A (en) | Battery life deterioration estimation device, battery life deterioration estimation method, and power storage system | |
| US20220196754A1 (en) | Method for detecting abnormal battery cell | |
| US20220399739A1 (en) | Doc setting apparatus and method | |
| KR20220094464A (en) | Battery diagnosis system, battery diagnosis method, battery pack, and electric vehicle | |
| EP4148443B1 (en) | Electronic device and method for estimating battery state | |
| EP4053572A1 (en) | Method and apparatus for estimating state of battery | |
| JP6062919B2 (en) | Method for optimal charging of electrochemical batteries | |
| US20230160965A1 (en) | Electronic device for estimating battery state and operating method thereof | |
| US11982714B2 (en) | Method and apparatus with battery state estimation | |
| WO2024061841A1 (en) | Method for determining a state of charge (soc) of a battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |