WO2012095894A1 - リチウムイオン電池の劣化速度推定方法、および劣化速度推定装置 - Google Patents
リチウムイオン電池の劣化速度推定方法、および劣化速度推定装置 Download PDFInfo
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- WO2012095894A1 WO2012095894A1 PCT/JP2011/000177 JP2011000177W WO2012095894A1 WO 2012095894 A1 WO2012095894 A1 WO 2012095894A1 JP 2011000177 W JP2011000177 W JP 2011000177W WO 2012095894 A1 WO2012095894 A1 WO 2012095894A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H01M10/425—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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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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
Definitions
- the present invention relates to an estimation method for estimating a deterioration rate of a lithium ion battery.
- a power storage device made of a lithium ion battery is known as a driving or auxiliary power source for electric vehicles, hybrid vehicles, and the like.
- Lithium ion batteries are deteriorated due to a decrease in battery capacity due to repeated charge and discharge. Since the deterioration rate of the lithium ion battery follows Arrhenius' law, the deterioration rate increases as the temperature increases.
- Patent Document 1 discloses a lithium ion battery that determines a deterioration state of the lithium ion battery based on information on a voltage change of the lithium ion battery acquired in a diagnostic mode in which the lithium ion battery is continuously discharged and charged at a constant power value. Disclosed is a battery deterioration determination method.
- an object of the present invention is to more accurately estimate the deterioration rate of a lithium ion battery.
- a lithium ion battery deterioration rate estimation method includes (1) a lithium ion battery that estimates a deterioration rate of a lithium ion battery including a negative electrode whose stage structure changes according to the amount of stored electricity. A first step of acquiring first information relating to the stage structure, a second step of acquiring second information relating to a battery temperature of the lithium ion battery, and the first step. And a third step of estimating the deterioration rate from the information and the second information.
- the correspondence between the voltage section of the lithium ion battery corresponding to each stage structure, the battery temperature, and the deterioration rate is examined in advance as third information, and the first
- the battery voltage of the lithium ion battery is acquired as the first information
- the deterioration rate is estimated from the first information and the second information based on the third information.
- the fourth step for calculating the deterioration amount from the deterioration rate estimated in the third step, and the evaluation parameter for evaluating the deterioration amount of the lithium ion battery exceeds the limit value.
- a graphite-based negative electrode can be used. Since the graphite-based negative electrode has a clear change in the stage structure, the third information can be easily obtained.
- a deterioration rate estimation device for a lithium ion battery provides: (6) A deterioration rate estimation device for a lithium ion battery that estimates a deterioration rate of a lithium ion battery that includes a negative electrode whose stage structure changes according to the amount of charge, and that acquires first information relating to the stage structure.
- a storage unit that stores third information indicating a correspondence relationship between a voltage section of the lithium ion battery corresponding to each of the stage structures, the battery temperature, and the deterioration rate
- the first acquisition unit acquires a battery voltage of a lithium ion battery as the first information
- the controller determines a deterioration rate from the first information and the second information based on the third information.
- the negative electrode stage structure can be easily estimated from the battery voltage. Thereby, the estimation accuracy of the deterioration rate can be improved by a simple method.
- the storage unit stores a cumulative deterioration amount that sequentially accumulates deterioration amounts calculated from the estimated deterioration rate, and the controller stores the deterioration amount of the lithium ion battery.
- the accumulated deterioration amount stored in the storage unit may be updated until an evaluation parameter to be evaluated exceeds a limit value, and the battery voltage section in the third information may be corrected based on the updated accumulated deterioration amount. . Since the relationship between the battery voltage and the negative electrode stage structure changes as the lithium ion battery deteriorates, the accuracy of deterioration rate estimation can be further improved by correcting the third information based on the cumulative deterioration amount.
- the controller continuously calculates the deterioration rate within a predetermined set time, and multiplies the average speed of these deterioration rates by the set time.
- the deterioration amount can be calculated.
- the deterioration rate of the lithium ion battery can be estimated more accurately.
- FIG. 1 is a block diagram of a deterioration rate estimation apparatus that estimates the deterioration rate of a lithium ion battery according to the present embodiment.
- the deterioration rate estimation apparatus 1 includes an assembled battery 10, voltage sensors (first acquisition units) 40A to 40N, a controller 50, a temperature sensor (second acquisition unit) 60, a storage unit 71, and a timer 72.
- the assembled battery 10 includes a plurality of battery blocks 12, and these battery blocks 12 are electrically connected to each other in series.
- Each of the battery blocks 12A to 12N includes a plurality of lithium ion batteries 11, and these lithium ion batteries 11 are electrically connected to each other in series.
- the inverter 20 is electrically connected to the total positive terminal and the total negative terminal of the assembled battery 10 through wiring.
- the inverter 20 is electrically connected to the motor 30 and drives the motor 30 using the output of the assembled battery 10.
- the assembled battery 10 according to the present embodiment is mounted on a vehicle (not shown), and the vehicle can be driven by driving the motor 30.
- the assembled battery 10 can be charged with electric power generated using a motor generator (not shown) as a generator.
- the vehicle mentioned above includes a hybrid vehicle and an electric vehicle.
- the hybrid vehicle is a vehicle provided with another power source such as an internal combustion engine for driving the vehicle and a fuel cell in addition to the assembled battery 10.
- An electric vehicle is a vehicle that travels using only the output of the battery pack 10.
- the controller 50 may be a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). Further, the controller 50 may include an ASIC circuit that executes at least a part of processing realized by causing the CPU and the MPU to execute the circuit.
- CPU Central Processing Unit
- MPU Micro Processing Unit
- the temperature sensor 60 is connected to the controller 50.
- the controller 50 constantly monitors the temperature of the assembled battery 10 based on the temperature information output from the temperature sensor 60.
- a current sensor 61 is connected to the wiring of the assembled battery 10.
- the current sensor 61 is connected to the controller 50.
- Voltage sensors 40A to 40N are connected to the battery blocks 12A to 12N, respectively. Each of the voltage sensors 40A to 40N detects the voltage of the corresponding battery block 12A to 12N (hereinafter referred to as a block voltage), and outputs the detection result to the controller 50.
- the controller 50 is electrically connected to the ignition switch 51.
- the storage unit 71 includes an estimation program for estimating the deterioration rate of the lithium ion battery, a correction program for correcting the estimated deterioration rate, and information required when executing these programs (for example, the voltage sensor 40 and the temperature sensor). 60 output values) are stored. Details of the information stored in the storage unit 71 will be described later.
- the controller 50 reads the program stored in the storage unit 71 into a memory (not shown) and decodes it.
- the storage unit 71 may be a RAM (Random Access Memory), a ROM (Read Only Memory), a DRAM (Dynamic Random Access Memory), and an SRAM (Static Random Access Memory).
- the present inventor has found that there is a correlation between the stage structure of the negative electrode of the lithium ion battery 11 and the deterioration rate. That is, even when the battery voltage is different, it has been found that when the negative electrode stage structure and the battery temperature are the same, the variation in the deterioration rate becomes very small.
- FIG. 2 shows the relationship between the stage structure of the negative electrode and the battery voltage, and the lithium ion battery 11 that is unused and has not deteriorated was targeted.
- the horizontal axis indicates the battery capacity of the lithium ion battery 11
- the vertical axis indicates the potential.
- the scale on the right side of the vertical axis corresponds to the potential of the negative electrode, and the scale on the left side corresponds to the potential of the positive electrode and the battery voltage of the lithium ion battery 11.
- the lithium ion battery 11 was manufactured by the following method.
- a positive electrode active material lithium nickel cobalt manganate and a conductive material acetylene black were mixed with polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) to prepare a paste-like positive electrode composition.
- the mass ratio of each material (excluding NMP) contained in this composition was 87% by mass for the positive electrode active material, 10% by mass for acetylene black, and 3% by mass for PVDF.
- the obtained positive electrode sheet and a negative electrode sheet obtained by applying graphite on a conductive foil were opposed to each other with a porous resin film interposed therebetween to obtain an electrode body.
- a lithium ion secondary battery was produced using the obtained electrode body and non-aqueous electrolyte solution.
- a mixed solvent composed of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) containing a supporting salt was used.
- LIPF6 was used as the supporting salt, and the concentration was adjusted so that it was contained at a concentration of about 1 mol / liter.
- Lithium occlusion graphite has a stage structure in which lithium is occluded regularly for each specific layer.
- stage n means a state in which (n-1) layers that do not occlude lithium exist between the total occluded lithium. Therefore, the value of n varies depending on the amount of lithium occluded. Even in the case of a lithium ion battery using a negative electrode other than graphite, the stage structure can be specified.
- an arrow extending from the curve indicating the negative electrode potential indicates a boundary where the negative electrode stage structure changes, and the negative electrode stage structure changes when the curve indicating the negative electrode potential is bent and changed.
- the stage structure of the negative electrode can be specified by charging and discharging the lithium ion battery 11 and examining the change in the negative electrode potential.
- the stage structure changes in the order of the stage 1, the stage 2, and the stage 3 from the side with the higher charged amount.
- the deterioration rate of the lithium ion battery 11 is the same (including errors), and the negative electrode stage structure changes, so that The deterioration rate of the battery 11 changes. Therefore, the deterioration rate of the lithium ion battery 11 can be estimated by examining the potential interval of the negative electrode potential corresponding to each of the stages 1 to 3.
- the stage structure of the negative electrode can be specified from the measured battery voltage by examining the relationship between the negative electrode potential and the battery voltage in advance by experiment or simulation. Further, the correspondence relationship between the battery voltage, the battery temperature, and the deterioration rate is examined in advance through experiments or simulations, and these pieces of information (hereinafter referred to as deterioration rate estimation information (third information)) are stored in the storage unit 71. Therefore, the deterioration rate can be accurately estimated.
- deterioration rate estimation information third information
- the battery voltage interval in the present embodiment is constituted by battery voltage intervals 1 to 3.
- the data format of the deterioration rate estimation information may be a data table.
- FIG. 3 is an example of a data table stored in the storage unit 71.
- the deterioration rate in each battery voltage section 1 to 3 is defined at intervals of 5 ° C.
- the temperature interval is not limited to 5 ° C., and the deterioration rate may be defined at intervals of 1 ° C., for example.
- the data format of the deterioration rate estimation information may be a function program for calculating the deterioration rate.
- a function program having the battery voltage and the battery temperature as variables is provided for each of the battery voltage sections 1 to 3, and these function programs are stored in the storage unit 71.
- the controller 50 calculates the deterioration rate by decoding the function program.
- the function program may be programmed according to Arrhenius' law.
- FIG. 4 is a graph corresponding to FIG. 2, and shows a state where the negative electrode potential is shifted to the right side as the battery decreases.
- a curve referred to as “base negative electrode potential” represents the negative electrode potential of the unused lithium ion battery 11
- a curve referred to as “corrected negative electrode potential” represents the negative electrode potential of the deteriorated lithium ion battery 11.
- a curve called “battery voltage (before deterioration)” shows the battery voltage of the unused lithium ion battery 11
- a curve called “battery voltage (after deterioration)” shows the battery of the lithium ion battery 11 after deterioration. The voltage is shown.
- the cumulative deterioration amount is a cumulative value of the deterioration amount, and means the total sum of the deterioration amounts accumulated until the limit value is exceeded.
- the total deterioration amount means the sum of the cumulative deterioration amounts.
- step S102 the controller 50 stores the battery temperature acquired by the temperature sensor 60 and the battery voltage acquired by the voltage sensors 40A to 40N in the storage unit 71 at a predetermined cycle, and further starts the timer 72.
- the battery voltage stored in the storage unit 71 is the sum of the voltage values output from the voltage sensors 40A to 40N, that is, the cell voltage value obtained by dividing the voltage value of the assembled battery 10 by the number of lithium ion batteries 11. There may be. In the following description, this cell voltage value is referred to as a battery voltage. Further, the predetermined cycle is shorter than a design time described later, and may be 1 sec, for example. Note that the storage unit 71 stores the accumulated deterioration amount and the total deterioration amount.
- step S103 the controller 50 refers to the data table stored in the storage unit 71 and searches for the deterioration rate based on the battery voltage and battery temperature detected in step S102.
- the retrieved degradation rates are sequentially stored in the storage unit 71.
- step S104 the controller 50 determines whether or not the count time by the timer 72 has reached a predetermined set time.
- the set time may be 1 hour.
- step S104 if the count time has reached the set time, the process proceeds to step S105. If the count time has not reached the set time, the process returns to step S102, and the processes in steps S102 and S103 are performed until the set time has elapsed. repeat.
- step S105 the controller 50 calculates the amount of deterioration by multiplying the average deterioration rate obtained by averaging the deterioration rates accumulated in the storage unit 71 by the set time.
- step S106 the controller 50 calculates the latest cumulative deterioration amount by adding the deterioration amount calculated in step S105 to the cumulative deterioration amount stored in the storage unit 71. When an unused battery is targeted, the latest cumulative deterioration amount is zero.
- step S107 the controller 50 determines whether or not the cumulative deterioration amount updated in step S106 is larger than the limit value.
- the limit value can be appropriately set from the viewpoint of improving the estimation accuracy of the battery deterioration amount. That is, when the limit value is large, the estimation accuracy of the deterioration rate is lowered. On the contrary, when the limit value is small, the estimation accuracy of the deterioration rate is improved.
- the limit value may be 1%, for example.
- step S107 when the updated cumulative deterioration amount is smaller than the limit value, the process proceeds to step S101, and the controller 50 resets the deterioration amount (not the cumulative deterioration amount). If the updated cumulative deterioration amount is larger than the limit value in step S107, the process proceeds to step S108.
- step S108 the controller 50 adds the cumulative deterioration amount updated in step S106 to the total deterioration amount stored in the storage unit 71 to update the total deterioration amount.
- step S109 the controller 50 shifts the curve indicating the “base negative electrode potential” to the right by the capacity corresponding to the updated total deterioration amount to obtain a curve indicating the “corrected negative electrode potential”.
- the controller 50 corrects the battery voltage sections 1 to 3 based on the curve indicating the “corrected negative electrode potential” and the curve indicating the “battery voltage (after deterioration)” after the deterioration. That is, the intersection of the stage structure boundary line in the curve indicating “corrected negative electrode potential” and the curve indicating “battery voltage (after degradation)” is obtained to correct the battery voltage sections 1 to 3 and stored in the storage unit 71. Rewrite the data table.
- step S110 the controller 50 resets the accumulated deterioration amount stored in the storage unit 71 and returns to step S101.
- the battery voltage interval is corrected when the accumulated deterioration amount (evaluation parameter) is higher than the limit value in step S107.
- evaluation parameter the degree of deterioration amount is determined.
- Other evaluation parameters that can be estimated indirectly can also be used.
- the other evaluation parameter may be a mileage of the vehicle.
- the travel distance of the vehicle is measured, and the battery voltage interval is corrected when the travel distance reaches a predetermined distance.
- the predetermined distance may be set based on a predetermined estimation accuracy of the deterioration rate. In this case, in step S107, the predetermined distance as the limit value is compared with the travel distance of the vehicle.
- the other evaluation parameter in the first modification may be the number of times the ignition coil of the vehicle is turned on.
- the number of times the ignition coil of the vehicle is turned on is detected, and the battery voltage interval is corrected when the number of detection times reaches a predetermined number.
- the predetermined number of times decreases, the deterioration rate estimation accuracy improves, and when the predetermined number of times increases, the deterioration rate estimation accuracy decreases. Therefore, the predetermined number of times may be set based on a predetermined estimation accuracy of the degradation rate in advance. In this case, in step S107, the number of times the ignition coil is turned on is compared with the predetermined number as the limit value.
- the evaluation parameter can be defined from various viewpoints, and is not limited to the same parameter as the deterioration amount.
- FIG. 6 is a graph corresponding to FIG. 4 and shows a state in which the negative electrode potential is shifted to the right side as the battery capacity decreases.
- the unused lithium ion battery 11 that is, the negative electrode potential curve is shifted by the total deterioration amount with reference to the initial negative electrode potential.
- the negative electrode of the lithium ion battery after deterioration The negative electrode potential curve is shifted by the cumulative deterioration amount based on the potential.
- the corrected battery voltage interval is stored in the storage unit 71 as base data (base negative potential).
- base data base negative potential
- the curve of the base negative electrode potential is shifted by an amount corresponding to the cumulative deterioration amount to correct the battery voltage interval.
- Modification 4 Although the deterioration amount is calculated when the set time is reached in the flowchart of FIG. 5 (step S104), the present invention is not limited to this, and when the change in the battery voltage exceeds a predetermined value, the deterioration rate and timer The deterioration amount may be calculated by multiplying the count time.
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Abstract
Description
(6)蓄電量に応じてステージ構造が変化する負極を含むリチウムイオン電池の劣化速度を推定するリチウムイオン電池の劣化速度推定装置であって、前記ステージ構造に関する第1の情報を取得する第1の取得部と、リチウムイオン電池の電池温度に関する第2の情報を取得する第2の取得部と、前記第1の情報及び前記第2の情報から劣化速度を推定するコントローラと、を有する。
図5のフローチャートでは、ステップS107において累積劣化量(評価パラメータ)がリミット値よりも高くなったときに電池電圧区間を補正したが、本発明はこれに限られるものではなく、劣化量の度合いを間接的に推定し得る他の評価パラメータを用いることもできる。
変形例1における当該他の評価パラメータは、車両のイグニッションコイルがオンされた回数であってもよい。この場合、車両のイグニッションコイルがオンされた回数を検知して、当該検知回数が所定回数に達した時に電池電圧区間を補正する。当該所定回数が少なくなると劣化速度の推定精度は向上し、当該所定回数が多くなると劣化速度の推定精度は低下する。したがって、当該所定回数は、要求される劣化速度の推定精度を予め定め、これに基づき設定すればよい。この場合、ステップS107において、イグニッションコイルがオンされた回数と、リミット値としての前記所定回数とが比較される。変形例1及び2に示されるように、評価パラメータは、種々の観点で規定することが可能であり、劣化量と同一のパラメータに限定されるものではない。
上述の実施形態では、図5のステップS108において総劣化量を更新したが、本発明はこれに限られるものではなく、他の方法であってもよい。図6は、図4に対応するグラフであり、電池容量が低下することにより負極電位が右側にシフトした状態を示す。上述の実施形態では、未使用のリチウムイオン電池11、つまり初期負極電位を基準として、負極電位の曲線を総劣化量分だけシフトさせたが、本変形例では、劣化後のリチウムイオン電池の負極電位をベースとして、負極電位の曲線を累積劣化量分だけシフトさせる構成である。
図5のフローチャートでは設定時間に達した時に劣化量を算出したが(ステップS104)、本発明はこれに限られるものではなく、電池電圧の変化が所定値を超えたときに、劣化速度とタイマーのカウント時間とを乗じて劣化量を算出するように構成してもよい。
12 電池ブロック 20 インバータ 30 モータ
40 電圧センサ 50 コントローラ 51 イグニションスイッチ 60 温度センサ 61 電流センサ
71 記憶部 72 タイマー
Claims (10)
- 蓄電量に応じてステージ構造が変化する負極を含むリチウムイオン電池の劣化速度を推定するリチウムイオン電池の劣化速度推定方法であって、
前記ステージ構造に関する第1の情報を取得する第1のステップと、
リチウムイオン電池の電池温度に関する第2の情報を取得する第2のステップと、
前記第1の情報及び前記第2の情報から劣化速度を推定する第3のステップと、を有するリチウムイオン電池の劣化速度推定方法。 - 各前記ステージ構造に対応するリチウムイオン電池の電圧区間、前記電池温度及び前記劣化速度の対応関係を第3の情報として予め調べておき、
前記第1のステップにおいて、リチウムイオン電池の電池電圧を前記第1の情報として取得し、
第3のステップにおいて、前記第3の情報に基づき、前記第1の情報及び前記第2の情報から劣化速度を推定することを特徴とする請求項1に記載のリチウムイオン電池の劣化速度推定方法。 - 前記第3のステップで推定された劣化速度から劣化量を算出する第4のステップと、
リチウムイオン電池の劣化量を評価する評価パラメータがリミット値を超えるまで、前記第4のステップで得られる劣化量を順次累積する第5のステップと、
前記第5のステップで得られた累積劣化量に基づき前記第3の情報における前記電圧区間を補正する第6のステップと、
を有する請求項2に記載のリチウムイオン電池の劣化速度推定方法。 - 前記第3のステップにおいて、前記劣化速度を、予め定められた設定時間内に連続的に算出し、
前記第4のステップにおいて、これらの劣化速度の平均速度に前記設定時間を乗じた値を前記劣化量として算出することを特徴とする請求項3に記載のリチウムイオン電池の劣化速度推定方法。 - 前記負極は、黒鉛系であることを特徴とする請求項2乃至4のうちいずれか一つに記載のリチウムイオン電池の劣化速度推定方法。
- 蓄電量に応じてステージ構造が変化する負極を含むリチウムイオン電池の劣化速度を推定するリチウムイオン電池の劣化速度推定装置であって、
前記ステージ構造に関する第1の情報を取得する第1の取得部と、
リチウムイオン電池の電池温度に関する第2の情報を取得する第2の取得部と、
前記第1の情報及び前記第2の情報から劣化速度を推定するコントローラと、を有するリチウムイオン電池の劣化速度推定装置。 - 各前記ステージ構造に対応するリチウムイオン電池の電圧区間、前記電池温度及び前記劣化速度の対応関係を示す第3の情報を記憶する記憶部を有し、
前記第1の取得部は、前記第1の情報としてリチウムイオン電池の電池電圧を取得し、
前記コントローラは、前記第3の情報に基づき、前記第1の情報及び前記第2の情報から劣化速度を推定することを特徴とする請求項6に記載のリチウムイオン電池の劣化速度推定装置。 - 前記記憶部には、推定された劣化速度から算出される劣化量を順次累積した累積劣化量が記憶され、
前記コントローラは、リチウムイオン電池の劣化量を評価する評価パラメータがリミット値を超えるまで、前記記憶部に記憶される前記累積劣化量を更新し、更新後の前記累積劣化量に基づき前記第3の情報における前記電池電圧の区間を補正することを特徴とする請求項7に記載のリチウムイオン電池の劣化速度推定装置。 - 前記コントローラは、前記劣化速度を、予め定められた設定時間内に連続的に算出し、これらの劣化速度の平均速度に前記設定時間を乗じた値を前記劣化量として算出することを特徴とする請求項8に記載のリチウムイオン電池の劣化速度推定装置。
- 前記負極は、黒鉛系であることを特徴とする請求項7乃至9のうちいずれか一つに記載のリチウムイオン電池の劣化速度推定装置。
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| PCT/JP2011/000177 WO2012095894A1 (ja) | 2011-01-14 | 2011-01-14 | リチウムイオン電池の劣化速度推定方法、および劣化速度推定装置 |
| JP2012552530A JP5594371B2 (ja) | 2011-01-14 | 2011-01-14 | リチウムイオン電池の劣化速度推定方法、および劣化速度推定装置 |
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| JP5594371B2 (ja) | 2014-09-24 |
| CN103329339A (zh) | 2013-09-25 |
| US9678167B2 (en) | 2017-06-13 |
| JPWO2012095894A1 (ja) | 2014-06-09 |
| CN103329339B (zh) | 2015-12-09 |
| US20130282316A1 (en) | 2013-10-24 |
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