JP2016006404A - Soundness calculation device, soundness calculation method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve accurate SOH estimation.SOLUTION: A soundness calculation device comprises: a first storage unit (11a); a second storage unit (11b); a third storage unit (11c); a storage-degradation-caused soundness calculation unit (12) for calculating a soundness caused by storage degradation and a soundness decrement caused by the storage degradation; storage-degradation-caused internal-resistance-increment calculation unit (13) for calculating an internal resistance increment caused by the storage degradation; an internal-resistance estimation unit (14) for estimating an internal resistance value; an internal-resistance-increment calculation unit (15) for calculating the internal resistance increment; a cycle-degradation-caused internal-resistance-increment calculation unit (16) for calculating an internal resistance increment caused by cycle degradation; a cycle-degradation-caused soundness-decrement calculation unit (17) for calculating a soundness decrement caused by the cycle degradation; and soundness calculation unit (18) for calculating a soundness of a battery.

Description

  The present invention relates to a battery soundness calculation device, a soundness calculation method, and a program.

  Conventionally, as shown in FIG. 1A and FIG. 1B, the battery deterioration mode (cause of deterioration) is considered as a single, the internal resistance estimated by the internal resistance calculation, and the relationship between the internal resistance R and SOH (State Of Health) From this, a method for obtaining SOH is known (for example, Patent Document 1).

Japanese Patent No. 3918238

  However, the amount of change in the internal resistance of the battery varies depending on the deterioration mode. For example, in an electric vehicle, there are a cycle deterioration mode (deterioration due to charging / discharging) and a storage deterioration mode (deterioration when the battery is left) in an electric vehicle. Mixed.

  Depending on the material and shape of the battery, the relationship between internal resistance and SOH in both cycle deterioration and storage deterioration may be the same or different. In Patent Document 1, since a single deterioration mode is captured, that is, the relationship between internal resistance and SOH in both cycle deterioration and storage deterioration is considered to be the same, a battery is actually used. Therefore, it is difficult to ensure the SOH estimation accuracy based on the internal resistance.

  Actually, FIG. 2 is a diagram showing the relationship between the increase in internal resistance and SOH, where the increase in internal resistance = each internal resistance value−a new product equivalent internal resistance value. As can be seen from FIG. 2, the relationship between internal resistance and SOH in cycle deterioration and storage deterioration is different.

  The objective of this invention made | formed in view of this point is providing the soundness calculation apparatus, soundness calculation method, and program which can estimate SOH accurately.

  In order to solve the above-described problem, a soundness calculation device for obtaining soundness from internal resistance of a battery according to the first invention is a first storage unit that stores a relationship between soundness due to storage deterioration and an increase in internal resistance. A second storage unit that stores an internal resistance initial value that is an internal resistance of the battery in an initial state, a third storage unit that stores a relationship between a soundness level due to cycle deterioration and an increase in internal resistance, and storage deterioration A storage deterioration soundness calculation unit that calculates a soundness decrease due to storage deterioration and a soundness decrease due to storage deterioration from at least one of the battery temperature, the charging rate, and the storage time; A storage deterioration internal resistance increase calculation unit for calculating an increase in internal resistance due to storage deterioration with reference to the relationship between soundness and internal resistance increase, and an internal resistance estimation value from the current and voltage of the battery. Resistance estimation unit The internal resistance initial value is subtracted from the internal resistance estimated value to calculate an internal resistance increase, and an internal resistance increase due to storage deterioration is subtracted from the internal resistance increase. The cycle deterioration internal resistance increase calculation unit for calculating the internal resistance increase due to the cycle deterioration and the relationship between the soundness due to the cycle deterioration and the internal resistance increase from the internal resistance increase due to the cycle deterioration, A cycle deterioration soundness decrease calculation unit for calculating a soundness decrease, and subtracting the soundness decrease due to the storage deterioration and the soundness decrease due to the cycle deterioration from the soundness initial value to determine the soundness of the battery. And a soundness degree calculation unit for calculating.

  In order to solve the above-described problem, the internal resistance estimation unit of the soundness calculation device according to the second invention includes the internal resistance initial value, the internal resistance increase due to the storage deterioration, and the internal resistance increase due to the cycle deterioration. About at least any one of these, It correct | amends using the temperature or the charging rate of the said battery, It is characterized by the above-mentioned.

  Moreover, in order to solve the said subject, the said internal resistance of the soundness calculation apparatus which concerns on 3rd invention has an early response part and a late response part, The said internal resistance estimation part is the said early response part and the said The internal resistance is corrected on the basis of a difference in influence caused by deterioration of the battery with a slow response portion.

  Furthermore, in order to solve the above-mentioned problem, according to the fourth invention, the soundness calculation method for obtaining the soundness from the internal resistance of the battery is the relationship between the soundness due to storage deterioration and the increase in internal resistance by the first storage unit. Between the step of storing the initial value of the internal resistance, which is the internal resistance of the battery in the initial state by the second storage unit, and the relationship between the soundness due to cycle deterioration and the increase in internal resistance by the third storage unit Storing, a storage deterioration soundness level calculation unit calculating a soundness level due to storage deterioration and a soundness decrease due to storage deterioration from at least one of battery temperature, charging rate, and storage time, and storage The deterioration internal resistance increase calculation unit calculates the internal resistance increase due to storage deterioration from the soundness due to storage deterioration with reference to the relationship between the soundness due to storage deterioration and the internal resistance increase. A step of estimating an internal resistance estimated value from the current and voltage of the battery by an internal resistance estimating unit, and subtracting the initial value of the internal resistance from the estimated internal resistance value by an internal resistance increasing amount calculating unit. A step of calculating an increase; a step of calculating an increase in internal resistance due to cycle deterioration by subtracting an increase in internal resistance due to storage deterioration from the increase in internal resistance by a cycle deterioration internal resistance increase calculation unit; and a cycle deterioration A step of calculating a soundness decrease due to cycle deterioration by referring to a relationship between the soundness due to cycle deterioration and an increase in internal resistance from the increase in internal resistance due to cycle deterioration by the soundness decrease calculation unit, and a soundness calculation Subtract the soundness decrease due to the storage deterioration and the soundness decrease due to the cycle deterioration from the initial soundness value. Characterized in that it comprises the steps of: calculating a degree of health of the battery.

  Furthermore, in order to solve the above-described problem, a program according to a fifth aspect of the invention is a program for storing a relationship between a soundness level due to storage deterioration and an increase in internal resistance and an internal resistance that is an internal resistance in an initial state of the battery. The procedure for storing the initial resistance value, the procedure for storing the relationship between the soundness due to cycle deterioration and the increase in internal resistance, the soundness due to storage deterioration and the decrease in soundness due to storage deterioration, and the battery temperature and charge rate From the procedure for calculating from at least one of the storage times and the soundness due to storage deterioration, the increase in internal resistance due to storage deterioration is calculated with reference to the relationship between the soundness due to storage deterioration and the increase in internal resistance. A procedure, a procedure for estimating an internal resistance estimated value from the current and voltage of the battery, a procedure for calculating an increase in internal resistance by subtracting the internal resistance initial value from the internal resistance estimated value, By subtracting the increase in internal resistance due to storage degradation from the increase in internal resistance to calculate the increase in internal resistance due to cycle deterioration, and from the increase in internal resistance due to cycle deterioration, the soundness and internal resistance increase due to cycle deterioration Referring to the relationship, the procedure for calculating the soundness decrease due to cycle deterioration, and subtracting the soundness decrease due to storage deterioration and the soundness decrease due to cycle deterioration from the initial soundness value And a procedure for calculating the soundness level.

  According to the soundness calculation apparatus according to the first aspect of the invention, the relationship between the decrease in soundness due to storage deterioration and the increase in internal resistance and the relationship between the decrease in soundness due to cycle deterioration and the increase in internal resistance are different batteries. However, if the overall increase in internal resistance is known, the state of charge (SOC) can be estimated more accurately than in the past.

  According to the soundness level calculation apparatus according to the second aspect of the present invention, the accuracy of soundness level calculation can be further improved by correcting using the battery temperature or SOC.

  According to the soundness level calculation device according to the third aspect of the present invention, the accuracy of soundness level calculation can be further improved by correcting the internal resistance based on the difference between the part that reacts early and the part that reacts late.

It is a figure which shows the general | schematic block diagram of a prior art. It is a figure which shows the detailed block diagram of a prior art. It is a figure which shows the relationship between the internal resistance increase in each deteriorated battery, and SOH. 1 is a functional block diagram of a battery health level calculation apparatus 1 according to an embodiment of the present invention. It is a figure which shows the deterioration degree at the time of the preservation | save in each temperature of the battery which concerns on one Embodiment of this invention. It is a figure which shows the deterioration degree at the time of the preservation | save in each SOC of the battery which concerns on one Embodiment of this invention. It is a figure which shows the operation | movement flow of the soundness calculation apparatus of the battery which concerns on one Embodiment of this invention. It is a figure which shows the operation | movement flow of the soundness calculation apparatus of the battery which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[System configuration]
FIG. 3 is a functional block diagram of the soundness degree calculation apparatus 1 according to an embodiment of the present invention. The soundness level calculation device 1 is a function of a controller connected to a battery, for example.

  In the present embodiment, the storage unit 11, the storage deterioration soundness calculation unit 12, the storage deterioration internal resistance increase calculation unit 13, the internal resistance estimation unit 14, the internal resistance increase calculation unit 15, and the cycle deterioration internal resistance increase calculation unit. 16, a cycle deterioration soundness decrease calculation unit 17 and a soundness calculation unit 18 are included. Furthermore, the storage unit 11 includes a storage deterioration soundness-internal resistance data storage unit 11a, an internal resistance initial value storage unit 11b, and a cycle deterioration soundness-internal resistance data storage unit 11c. Although each function of the soundness calculation apparatus 1 according to the present invention will be described, it should be noted that the other functions of the soundness calculation apparatus 1 are not intended to be excluded. The storage deterioration soundness-internal resistance data storage unit 11a, the internal resistance initial value storage unit 11b, and the cycle deterioration soundness-internal resistance data storage unit 11c are respectively referred to as the “first storage unit” and “second storage” of the present invention. And “third storage unit”.

The storage deterioration soundness-internal resistance data storage unit 11a stores the relationship between the soundness due to storage deterioration and the increase in internal resistance, which is obtained in advance through experiments. As shown in FIG. 2, for example, the relationship is a relationship in which the internal resistance increases when the soundness level due to storage deterioration decreases (when the deterioration level increases). Table 1 below shows an example of a table showing the relationship between the degree of soundness (SOH) due to storage deterioration and the internal resistance.

  The internal resistance initial value storage unit 11b stores an internal resistance initial value that is an internal resistance in the initial state of the battery.

The cycle deterioration soundness-internal resistance data storage unit 11c stores the relationship between the soundness due to cycle deterioration and the increase in internal resistance, which is obtained in advance through experiments. For example, as shown in FIG. 2, the relationship is a relationship in which the internal resistance increases when the soundness due to cycle deterioration decreases. Table 2 below shows an example of a table showing the relationship between the soundness (SOH) due to cycle deterioration and the internal resistance in numerical values.

  The storage deterioration and the cycle deterioration differ in the part of the battery that deteriorates. For example, storage deterioration is deterioration due to the growth of a film on the surface of the negative electrode, and cycle deterioration is deterioration due to stress applied to the electrode surface material because lithium ions enter and exit. For this reason, the soundness decrease of the whole battery can be obtained by adding the soundness decrease due to storage deterioration and the soundness decrease due to cycle deterioration. Similarly, the increase in internal resistance of the entire battery can be obtained by adding the increase in internal resistance due to storage deterioration and the increase in internal resistance due to cycle deterioration. In the present embodiment, the soundness level is calculated using this fact.

The storage deterioration soundness calculation unit 12 obtains how much SOH has changed due to storage deterioration by recording the battery temperature, SOC, and storage time. The storage deterioration soundness level calculation unit 12 refers to data (shown in FIGS. 4A and 4B) obtained in advance by experiments, and determines the soundness level due to storage deterioration (at least one of the battery temperature, the charge rate, and the storage time) ( SOH _storage ) and soundness reduction due to storage deterioration (ΔSOH _storage ) are calculated.

  FIG. 4A is a diagram showing the relationship between discharge capacity and time during storage at each temperature. As shown in FIG. 4A, the higher the battery temperature, the greater the increase in discharge capacity over time. Since there is a relationship of SOH = 100−Capacity loss, it can be said that the higher the battery temperature, the greater the degree of soundness reduction with time.

  FIG. 4B is a diagram showing the relationship between the capacity retention rate and time during storage in each SOC. As shown in FIG. 4B, the higher the SOC, the greater the decrease in capacity retention over time. Since there is a relationship of SOH = capacity retention, it can be said that the higher the SOC, the greater the decrease in SOH over time.

The storage deterioration internal resistance increase calculation unit 13 changes due to storage deterioration using the soundness due to storage deterioration calculated by the storage deterioration soundness calculation unit 12 and the storage deterioration soundness-internal resistance data storage unit 11a. The increase in internal resistance (ΔR _storage ) is calculated.

  The internal resistance estimation unit 14 acquires information on the current and voltage of the battery, and sequentially estimates the current internal resistance estimation value by dividing the voltage by the current. The internal resistance estimation unit 14 can further correct the internal resistance value to a value of a predetermined standard condition. For example, when the standard condition of each storage unit included in the storage unit 11 is “battery temperature 25 ° C.”, the internal resistance value obtained from the current and voltage of the battery when the battery temperature is 0 ° C. is used as it is to calculate the soundness later. If used, the condition is not equal, which may affect the accuracy of soundness calculation. Therefore, the accuracy of soundness calculation can be improved by correcting the internal resistance value to the value in the case of “battery temperature 25 ° C.” which is a standard condition.

  It is also effective to match the conditions based on SOC instead of battery temperature. The correction target is any or all of the internal resistance initial value, the storage deterioration internal resistance increase, or the cycle deterioration internal resistance increase. With this configuration, it is possible to cope with internal resistance that varies with temperature or SOC, so that the accuracy of soundness calculation is improved.

  Here, the internal resistance is the sum of connection resistance, electrolyte resistance, charge transfer resistance, and diffusion resistance. The wiring resistance, the electrolyte resistance, and the charge transfer resistance are parts that react quickly (hereinafter referred to as a fast response part), and the diffusion resistances are parts that react slowly (hereinafter referred to as a slow response part). The slow response portion is relatively unaffected by battery degradation compared to the fast response portion. It is known that the slow response part also changes in the electric vehicle (EV). For this reason, the accuracy of soundness calculation can be further improved by correcting the internal resistance in consideration of this difference.

The internal resistance increase calculation unit 15 subtracts the internal resistance value equivalent to a new battery from the value estimated by the internal resistance estimation unit 14 to store the internal resistance increase ΔR _cycle + ΔR _storage changed due to cycle deterioration and storage deterioration. Ask. This utilizes the relationship of internal resistance R = ΔR _storage + ΔR _cycle + new product equivalent internal resistance. Note that the overall increase in internal resistance can be obtained by parameter estimation in addition to the method using voltage and current. When subtracting, it is also possible to calculate in accordance with the standard conditions, thereby improving the accuracy of calculating the soundness level.

The cycle deterioration internal resistance increase calculation unit 16 subtracts the ΔR _preservation obtained by the storage deterioration internal resistance increase calculation unit 13 from the ΔR _cycle + ΔR _preservation obtained by the internal resistance increase calculation unit 15 and changes due to cycle deterioration. The increased internal resistance ΔR _cycle is obtained.

The cycle deterioration soundness decrease calculation unit 17 includes the internal resistance increase ΔR _cycle changed by the cycle deterioration obtained by the cycle deterioration internal resistance increase calculation unit 16, and the soundness and internal resistance due to cycle deterioration obtained in advance by experiments. Using the cycle deterioration soundness-internal resistance data storage unit 11c that stores the relationship with the increase, a soundness decrease due to cycle deterioration (ΔSOH _cycle ) is calculated.

The soundness level calculation unit 18 calculates a soundness decrease due to cycle deterioration (ΔSOH _cycle ) calculated by the cycle deterioration soundness level decrease calculation unit 17 from a soundness initial value 100 (%), and a storage deterioration soundness level calculation unit. The soundness of the entire battery is calculated by subtracting the soundness decrease due to storage deterioration calculated in 12 (ΔSOH _storage ).

  In the conventional technology, the relationship between the internal resistance and SOH in both cycle deterioration and storage deterioration is considered to be the same, so in the environment where the battery is actually used, the SOH estimation accuracy based on the internal resistance is ensured. It was difficult to do. However, according to the present invention, the SOH of the entire battery can be accurately obtained by separating the increase in internal resistance due to storage deterioration and the increase in internal resistance due to cycle deterioration.

[Operation flow]
FIG.5 and FIG.6 is a figure which shows the operation | movement flow of the soundness calculation apparatus 1 which concerns on one Embodiment of this invention.

The storage deterioration soundness calculation unit 12 of the soundness calculation device 1 refers to data obtained by experiments in advance, and from the battery temperature, the charging rate, and the storage time, the soundness due to storage deterioration (SOH _storage ) and the storage deterioration The degree of soundness reduction (ΔSOH _storage ) is calculated (step S1).

The storage deterioration internal resistance increase calculation unit 13 of the soundness calculation device 1 changes depending on the storage deterioration using the soundness due to the storage deterioration calculated in step S1 and the storage deterioration soundness-internal resistance data storage unit 11a. The increased internal resistance (ΔR _storage ) is calculated (step S2).

  The internal resistance estimation unit 14 of the soundness calculation device 1 sequentially estimates the current internal resistance value (step S3). The internal resistance estimator 14 further calculates the internal resistance value (either internal resistance initial value, storage deterioration internal resistance increase or cycle deterioration internal resistance increase or any of them) using a battery temperature or SOC and a predetermined standard condition. It is also possible to correct the value.

The internal resistance increase calculation unit 15 of the soundness calculation device 1 subtracts the internal resistance value corresponding to a new battery from the value estimated in step S3, and increases the internal resistance ΔR _cycle + ΔR changed due to cycle deterioration and storage deterioration. _Save is requested (step S4).

  In addition, step S1 and step S2, and step S3 and step S4 may be performed simultaneously, or either may be performed first.

The cycle deterioration internal resistance increase calculation unit 16 of the soundness calculation device 1 subtracts the ΔR _storage obtained in step S2 from the ΔR _cycle + ΔR _storage obtained in step S4, and the internal resistance increase ΔR changed due to the cycle deterioration. _{A cycle} is obtained (step S5).

The cycle deterioration soundness decrease calculating unit 17 uses the internal resistance increase ΔR _cycle changed by the cycle deterioration obtained in step S5 and the cycle deterioration soundness-internal resistance data storage unit 11c to determine the soundness due to cycle deterioration. A decrease (ΔSOH _cycle ) is calculated (step S6).

The soundness level calculation unit 18 calculates the soundness decrease due to cycle deterioration (ΔSOH _cycle ) calculated in step S6 and the soundness decrease due to storage deterioration calculated in step S1 from 100 (%) of the soundness initial value. By subtracting (ΔSOH _storage ), the health level of the entire battery is calculated and output (step S7).

  When the soundness calculation device 1 according to the present invention is configured by a computer, a program describing processing contents for realizing each function is stored in an internal or external storage unit of the computer, and the center of the computer is stored. This can be realized by reading out and executing this program by an arithmetic processing unit (CPU). In addition, such a program can be distributed by selling, transferring, or lending a portable recording medium such as a DVD or a CD-ROM, and such a program is stored in a storage unit of a server on a network, for example. And the program can be distributed by transferring the program from the server to another computer via the network. In addition, a computer that executes such a program can temporarily store, for example, a program recorded on a portable recording medium or a program transferred from a server in its own storage unit. As another embodiment of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and each time the program is transferred from the server to the computer. In addition, the processing according to the received program may be executed sequentially. Therefore, the present invention is not limited to the above-described embodiments, and various modifications can be made by combining or partially deleting the same without departing from the spirit of the present invention.

11 storage unit 11a preservation deterioration soundness-internal resistance data storage unit 11b internal resistance initial value storage unit 11c cycle deterioration soundness-internal resistance data storage unit 12 preservation deterioration soundness calculation unit 13 preservation deterioration internal resistance increase calculation unit 14 inside Resistance estimation unit 15 Internal resistance increase calculation unit 16 Cycle deterioration internal resistance increase calculation unit 17 Cycle deterioration soundness decrease calculation unit 18 Soundness calculation unit

Claims (5)

In the soundness calculation device that calculates the soundness from the internal resistance of the battery,
A first storage unit for storing a relationship between a soundness level due to storage deterioration and an increase in internal resistance;
A second storage unit that stores an internal resistance initial value that is an internal resistance in an initial state of the battery;
A third storage unit for storing the relationship between the degree of soundness due to cycle deterioration and the increase in internal resistance;
A storage deterioration soundness level calculation unit that calculates a soundness level due to storage deterioration and a decrease in soundness level due to storage deterioration from at least one of a battery temperature, a charging rate, and a storage time;
From the soundness due to the storage deterioration, referring to the relationship between the soundness due to the storage deterioration and the internal resistance increase, a storage deterioration internal resistance increase calculation unit for calculating the internal resistance increase due to the storage deterioration, and
An internal resistance estimator for estimating an internal resistance estimated value from the current and voltage of the battery;
An internal resistance increase calculation unit that calculates an internal resistance increase by subtracting the internal resistance initial value from the internal resistance estimated value;
A cycle deterioration internal resistance increase calculation unit for calculating an internal resistance increase due to cycle deterioration by subtracting the internal resistance increase due to storage deterioration from the internal resistance increase; and
From the internal resistance increase due to the cycle deterioration, referring to the relationship between the soundness due to the cycle deterioration and the internal resistance increase, a cycle deterioration soundness decrease calculation unit that calculates a soundness decrease due to the cycle deterioration;
A soundness calculation unit that calculates the soundness of the battery by subtracting the soundness decrease due to the storage deterioration and the soundness decrease due to the cycle deterioration from a soundness initial value;
A soundness calculation device comprising: The soundness calculation apparatus according to claim 1,
The internal resistance estimator corrects at least one of the initial value of the internal resistance, the internal resistance increase due to the storage deterioration, and the internal resistance increase due to the cycle deterioration using the temperature or the charging rate of the battery. A soundness calculation device characterized by performing. In the soundness calculation apparatus according to claim 1 or 2,
The internal resistance has a fast response portion and a slow response portion,
The soundness calculation device, wherein the internal resistance estimator corrects the internal resistance based on a difference in influence caused by deterioration of the battery between the fast response portion and the slow response portion. In the soundness calculation method for obtaining the soundness from the internal resistance of the battery,
Storing the relationship between the degree of soundness due to storage deterioration and the increase in internal resistance by the first storage unit;
Storing an internal resistance initial value which is an internal resistance of the battery in an initial state by the second storage unit;
Storing a relationship between a soundness level due to cycle deterioration and an increase in internal resistance by a third storage unit;
Calculating a soundness level due to storage deterioration and a soundness decrease due to storage deterioration from at least one of battery temperature, charging rate, and storage time by a storage deterioration soundness level calculation unit;
From the soundness due to the storage deterioration by the storage deterioration internal resistance increase calculation unit, referring to the relationship between the soundness due to the storage deterioration and the internal resistance increase, calculating the internal resistance increase due to the storage deterioration,
Estimating an internal resistance estimated value from the current and voltage of the battery by an internal resistance estimating unit;
Subtracting the internal resistance initial value from the internal resistance estimation value by an internal resistance increase calculation unit to calculate an internal resistance increase; and
Subtracting the internal resistance increase due to the storage deterioration from the internal resistance increase by the cycle deterioration internal resistance increase calculation unit to calculate the internal resistance increase due to the cycle deterioration;
A step of calculating a soundness decrease due to cycle deterioration by referring to a relationship between the soundness due to cycle deterioration and an increase in internal resistance from the increase in internal resistance due to the cycle deterioration by the cycle deterioration soundness decrease calculation unit;
Subtracting the soundness decrease due to the storage deterioration and the soundness decrease due to the cycle deterioration from the soundness initial value by the soundness calculation unit, and calculating the soundness of the battery;
The soundness calculation method characterized by including. On the computer,
A procedure for memorizing the relationship between the degree of soundness due to storage deterioration and the increase in internal resistance,
A procedure for storing an internal resistance initial value that is an internal resistance in an initial state of the battery;
A procedure for storing the relationship between the degree of soundness due to cycle deterioration and the increase in internal resistance,
A procedure for calculating the soundness due to storage deterioration and the decrease in soundness due to storage deterioration from at least one of battery temperature, charge rate, and storage time;
From the soundness due to the storage deterioration, referring to the relationship between the soundness due to the storage deterioration and the increase in internal resistance, a procedure for calculating the increase in internal resistance due to the storage deterioration,
A procedure for estimating an internal resistance estimate from the current and voltage of the battery;
Subtracting the initial value of the internal resistance from the estimated internal resistance value to calculate an increase in internal resistance;
Subtracting the increase in internal resistance due to storage deterioration from the increase in internal resistance to calculate the increase in internal resistance due to cycle deterioration;
From the internal resistance increase due to the cycle deterioration, referring to the relationship between the soundness due to the cycle deterioration and the internal resistance increase, a procedure for calculating the soundness decrease due to the cycle deterioration;
A procedure for calculating the soundness of the battery by subtracting the soundness decrease due to the storage deterioration and the soundness decrease due to the cycle deterioration from the soundness initial value;
A program for running

Images