JP6488538B2 - Deterioration coefficient determination system, deterioration prediction system, deterioration coefficient determination method and program - Google Patents

Description

  The present invention relates to a deterioration coefficient determination system, a deterioration prediction system, a deterioration coefficient determination method, and a program, and more particularly, to a deterioration coefficient determination system, a deterioration prediction system, a deterioration coefficient determination method, and a program for determining a deterioration coefficient of a storage battery.

  The deterioration speed of the storage battery changes according to the use condition of the storage battery defined by the temperature, the state of charge (SOC), or the like.

  Patent Document 1 describes a battery deterioration estimation method that estimates a deterioration state of a storage battery according to use conditions.

  In the battery deterioration estimation method described in Patent Document 1, first, a storage battery deterioration test is performed for each of a plurality of use conditions preliminarily classified by temperature and SOC. As shown in FIG. The points indicating the relationship between the capacity retention rate of the storage battery and the square root of the energization current amount of the storage battery are plotted in the cycle characteristic diagram for each use condition.

  Next, for each use condition, a fitting process is performed to obtain a function that applies to a line formed at a point plotted for the use condition.

  Subsequently, for each use condition, the slope of the function obtained in the fitting process is determined as a deterioration coefficient under the use condition, and the relationship between the use condition and the deterioration coefficient is summarized in a table as shown in FIG. It is done.

  Here, a curve or a straight line obtained by the fitting process is referred to as a “deterioration curve”, and a table as shown in FIG. 15 is referred to as a “deterioration coefficient table”. In addition, a deterioration curve of a use condition serving as a reference is referred to as a “reference deterioration curve”. In Patent Document 1, the usage conditions divided at a temperature of 25 ° C. and an SOC width of 0 to 100% are used as the usage conditions (reference usage conditions) in the reference deterioration mode.

  By using the reference deterioration curve and the deterioration coefficient corresponding to the use conditions, the deterioration curves under various use conditions can be expressed.

  For this reason, if the deterioration coefficient under a certain use condition can be obtained, it becomes possible to predict the transition of the deterioration of the storage battery and the remaining life of the storage battery under the use condition. In general, the time when the capacity maintenance rate falls below 80% is often determined as the life of the storage battery.

  Further, in the example shown in FIG. 15, the deterioration test of the storage battery is performed under nine patterns of use conditions. However, if the deterioration test is performed by dividing the use conditions more finely, the prediction accuracy is improved, and the reverse However, if the deterioration test is performed under rough conditions of use, the prediction accuracy deteriorates.

JP 2011-220900 A

  In the battery deterioration estimation method described in Patent Document 1, it is necessary to perform a deterioration test of a storage battery under predetermined use conditions in order to obtain a deterioration coefficient. The usage conditions include, for example, the type of storage battery, the type of cell, and the usage environment, and a large number of degradation tests are required to improve the accuracy of degradation estimation. For this reason, the technique which can also use storage batteries other than the storage battery in which a deterioration test is implemented is calculated | required as a storage battery used in order to obtain | require a deterioration coefficient.

  An object of the present invention is to provide a degradation coefficient determination system, a degradation prediction system, a degradation coefficient determination method, and a program that can solve the above-described problems.

The degradation coefficient determination system of the present invention is
The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in each of the plurality of sections, and the determined time A specifying means for specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition Determining means for determining a value for each use condition;
Have
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
The determining means includes
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
The absolute value of the difference between the first time and the second time, or the value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. It is a configuration.

The degradation coefficient determination method of the present invention is:
A degradation coefficient determination method executed by a degradation coefficient determination system,
The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in each of the plurality of sections, and the determined time A specific step of specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition A determination step for determining a value for each use condition;
Have
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
The determining step includes
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
The absolute value of the difference between the first time and the second time, or the value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. Is the method.

The program of the present invention is stored in a computer.
The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in which of the plurality of sections, and the determined time A specific procedure for specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition A determination procedure for determining a value for each use condition;
Is to execute
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
In the determination procedure,
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
An absolute value of a difference between the first time and the second time, or a value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. Is for.

  According to the present invention, a storage battery other than the storage battery on which the deterioration test is performed can be used as the storage battery used for obtaining the deterioration coefficient.

It is a block diagram showing storage battery life prediction system 1 of one embodiment of the present invention. It is the figure which showed an example of several conditions. It is the figure which showed an example of the hardware constitutions of the storage battery lifetime prediction system. 3 is a flowchart for explaining the operation of the storage battery life prediction system 1; It is the figure which showed an example of the transition graph. The transition graph includes a reference deterioration curve, deterioration curves for each of the usage conditions 1 to n, (D provisional ₂ , t _1,2 ), (D provisional ₃ , t _2,3 ), and (D provisional _n , t _{n−1, n} ). It is the figure which showed an example of the degradation coefficient table. It is the figure which showed the graph in the case of using deterioration curves A1 and Z1. It is the figure which showed the usage log of the storage battery. It is the figure which showed the case where a use condition has changed once within the capacity maintenance rate detection period. It is the figure which showed transition of use conditions. It is the figure which showed the deterioration curve according to use conditions. It is the figure which showed the degradation coefficient determination system which consists of 4 A of specific parts, and the degradation coefficient determination part 5A. It is the figure which showed the deterioration test result. It is the figure which showed the table which showed the degradation coefficient obtained from the degradation test result.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a storage battery life prediction system 1 according to an embodiment of the present invention.

  In FIG. 1, a storage battery life prediction system 1 is an example of a deterioration prediction system, and includes a communication unit 2, a storage unit 3, a specification unit 4, a deterioration coefficient determination unit 5, an input unit 6, and a deterioration estimation unit 7. And an output unit 8. The communication unit 2, the storage unit 3, the specifying unit 4, and the deterioration coefficient determination unit 5 are included in the deterioration coefficient determination system 9.

  The communication unit 2 is an example of an information receiving unit.

  The communication unit 2 communicates with the storage battery devices 201 to 20s (s is an integer equal to or greater than 1) via the communication network 101. Note that the communication unit 2 may communicate with the storage battery devices 201 to 20 s without using the communication network 101.

  The storage battery devices 201 to 20s have the same configuration. For this reason, below, the storage battery apparatus 201 is demonstrated among the storage battery apparatuses 201-20s.

  Storage battery device 201 includes a storage battery 201a and a control unit 201b.

  The storage battery 201a is a storage battery used by consumers such as ordinary households and companies. In addition, the storage battery 201a is not restricted to the storage battery used in a general household or a company. For example, the storage battery 201a may be a test storage battery.

  The control unit 201b has an internal clock and controls the storage battery 201a. For example, the control unit 201b detects information related to the performance of the storage battery 201a in time series, and transmits the detection result to the communication unit 2. The control unit 201b controls charging and discharging of the storage battery 201a.

  As information related to the performance of the storage battery 201a, the control unit 201b detects the performance of the storage battery 201a and the state of the storage battery 201a that affects the performance of the storage battery 201a (hereinafter also simply referred to as “state”) in time series. Each detection result is transmitted to the communication unit 2.

  For this reason, for the communication unit 2, information indicating the performance of the storage battery 201 in time series (hereinafter referred to as “performance information”) and information indicating the state of the storage battery 201 in time series (hereinafter referred to as “state information”). ) Will be sent. The performance information represents a transition of the performance of the storage battery 201, and the state information represents a transition of the state of the storage battery 201.

  The control unit 201b detects the capacity maintenance rate of the storage battery 201a as the performance of the storage battery 201a.

  The capacity maintenance rate is a ratio of the capacity of the storage battery 201a at a certain point in time to the initial capacity of the storage battery 201a. The controller 201b detects the capacity maintenance rate of the storage battery 201a as follows, for example. When connected to the storage battery 201a, the control unit 201b detects the capacity of the storage battery 201a and holds the detection result as the initial capacity of the storage battery 201a. Thereafter, the control unit 201b detects the capacity maintenance rate of the storage battery 201a by redetecting the capacity of the storage battery 201a and multiplying the result of dividing the redetection result by the initial capacity by 100.

  The performance of the storage battery 201a is not limited to the capacity maintenance rate of the storage battery 201a, and can be changed as appropriate. For example, as the performance of the storage battery 201a, the resistance of the storage battery 201a or the full charge capacity of the storage battery 201a may be used.

  The control unit 201b detects the temperature of the storage battery 201a, the state of charge SOC, and the charge / discharge rate C-rate as the state of the storage battery 201a.

  The state of the storage battery 201a is not limited to the temperature of the storage battery 201a, the state of charge SOC, and the charge / discharge rate C-rate, but can be changed as appropriate. For example, as the state of the storage battery 201a, a voltage of the storage battery 201a or a current input to or output from the storage battery 201a may be used.

  In this embodiment, the control part 201b makes the detection time interval of the state of the storage battery 201a shorter than the detection time interval of the state of the storage battery 201a. In addition, the detection time interval of the state of the storage battery 201a may be the same as the detection time interval of the performance of the storage battery 201a.

  In addition, the control unit 201b includes, in the performance of the storage battery 201a (performance detection result), identification information (hereinafter referred to as “storage battery ID”) of the storage battery 201a in which the performance is detected, and a detection time indicating the detection time of the performance. And the performance with the storage battery ID and the detection time information added (hereinafter referred to as “performance with additional information”) is transmitted to the communication unit 2.

  In addition, the control unit 201b adds the storage battery ID of the storage battery 201a in which the state is detected and the detection time information indicating the detection time of the state to the state of the storage battery 201a (state detection result), and the storage battery ID And the state to which the detection time information is added (hereinafter referred to as “state with additional information”) is transmitted to the communication unit 2.

  The performance and state of the storage battery 201a detected at the same time represent the performance of the storage battery 201a in the state (use condition) of the storage battery 201a at that time.

  The communication unit 2 receives the performance with additional information and the state with additional information from the storage battery devices 201 to 20s. The communication unit 2 stores the performance with additional information and the state with additional information in the storage unit 3.

  The storage unit 3 is a recording medium such as a nonvolatile memory, for example, and stores various information.

  For example, the storage unit 3 stores performance with additional information and a state with additional information.

  In addition, the storage unit 3 stores a reference function f (t) representing a reference deterioration curve. The reference function f (t) is a point in time when the use time t has elapsed based on u (u is an integer of 1 or more) reference constants corresponding to the reference use condition and the use time t of the storage battery 201a which is an independent variable. The reference | standard deterioration curve showing the performance of the storage battery 201a in FIG. Note that u reference constants corresponding to the reference use condition mean a deterioration coefficient in the reference use condition.

  Moreover, the memory | storage part 3 memorize | stores the several conditions divided by the combination of the temperature of the storage battery 201a, charge condition SOC, and charging / discharging speed | rate C-rate. A serial number from “1” to “p” (p is an integer of 2 or more) is assigned to each of the plurality of conditions as condition identification information.

  FIG. 2 is a diagram illustrating an example of a plurality of conditions.

  In FIG. 2, three categories of “0 ° C. or more and less than 10 ° C.”, “10 ° C. or more and less than 20 ° C.”, and “20 ° C. or more and 30 ° C. or less” are set, and the charge state SOC is set. Three categories are set: “0% or more and less than 30%”, “30% or more and less than 70%”, and “70% or more and 100% or less”, and the charge / discharge rate C-rate is “0C or more and less than 0.5C” ”,“ 0.5C or more and less than 1.0C ”, and“ 1.0C or more and 1.5C or less ”are set. In FIG. 2, 27 conditions are represented by combinations of three categories of temperature, state of charge SOC, and charge / discharge rate C-rate. The number of conditions is not limited to 27 and can be changed as appropriate.

  The specifying unit 4 is an example of a specifying unit.

  The specifying unit 4 classifies the state of the storage battery 201a stored in the storage unit 3 (combination of temperature, charge state SOC, and charge / discharge rate C-rate) according to the state of the storage battery 201a, and includes the state of the storage battery 201a. The use condition of the storage battery 201a is specified.

  In the present embodiment, the specifying unit 4 selects the state of the storage battery 201a (temperature, charge state SOC, and charge / discharge rate C-rate) stored in the storage unit 3 from among a plurality of conditions stored in the storage unit 3. The corresponding condition including any one of the combinations) is specified as the use condition of the storage battery 201a.

  The degradation coefficient determination unit 5 is an example of a determination unit.

  The deterioration coefficient determination unit 5 determines the deterioration coefficient under the use condition in the use condition unit specified by the specifying unit 4 using the performance stored in the storage unit 3. The deterioration coefficient represents the state of deterioration of the storage battery 201a under use conditions (for example, the degree of deterioration speed). It should be noted that the deterioration state represented by the deterioration coefficient is not limited to the degree of deterioration, and can be changed as appropriate. The degradation coefficient determination unit 5 stores the degradation coefficient under use conditions in the storage unit 3.

  The input unit 6 is an example of a condition receiving unit.

  The input unit 6 is a device for giving data, information, instructions, and the like to the storage battery life prediction system 1, and is, for example, a keyboard or a touch panel. The input unit 6 accepts a scheduled use condition that represents at least one of the use conditions determined by the degradation coefficient determination unit 5.

  The deterioration estimation unit 7 is an example of a generation unit.

  The deterioration estimating unit 7 uses the deterioration coefficient determined by the deterioration coefficient determining unit 5 with respect to the use condition represented in the scheduled use condition, and the transition of the deterioration of the storage battery 201a under the use condition represented in the planned use condition. Is generated. The deterioration curve is an example of a deterioration transition line.

  The output unit 8 is, for example, a display, a projector, a printer, or a speaker, and outputs various information. In the following, it is assumed that a display is used as the output unit 8. For example, the output unit 8 displays the deterioration curve generated by the deterioration estimation unit 7.

  FIG. 3 is a diagram illustrating an example of a hardware configuration of the storage battery life prediction system 1. In FIG. 3, the same components as those shown in FIG.

  The display unit 8A is an example of the output unit 8. The arithmetic processing unit 10 has the same functions as the specifying unit 4, the deterioration coefficient determining unit 5, and the deterioration estimating unit 7. When a computer is used as the arithmetic processing unit 10, the arithmetic processing unit 10 reads and executes a program stored in the storage unit 3, for example, thereby specifying the specifying unit 4, the deterioration coefficient determining unit 5, and the deterioration estimating unit 7. To achieve the same function. The arithmetic processing device 10, the communication unit 2, and the storage unit 3 are included in the storage battery life prediction device 11.

  Next, the operation will be described.

  FIG. 4 is a flowchart for explaining the operation of the storage battery life prediction system 1.

  First, in step S1, the communication unit 2 acquires time-series data of information related to deterioration of the storage battery 201a from a large number of storage battery devices 201 to 20s that are distributed and installed in the consumer.

  The time-series data of information related to the deterioration of the storage battery 201a is the time-series data of performance and state detected (measured) from the start of use of each storage battery 201a to the present, and the time series data from each of the storage battery devices 201 to 20s. The performance with additional information and the state with additional information transmitted in a sequence. As described above, the performance represents the capacity maintenance rate of the storage battery 201a, and the state represents the temperature, the charge state SOC, and the charge / discharge rate C-rate of the storage battery 201a.

  The communication unit 2 stores time-series data of information related to deterioration of the storage battery 201a in the storage unit 3.

  Subsequently, in step S2, the specifying unit 4 specifies the use condition of the storage battery 201a using the time-series data of the information related to the deterioration of the storage battery 201a acquired in step S1, and the deterioration coefficient determining unit 5 is set in step S1. Using the time-series data of the information relating to the deterioration of the storage battery 201a acquired in step 1 and the reference deterioration curve defined by the reference function stored in the storage unit 3, the deterioration coefficient of each storage battery 201a under each use condition Deriving a value and updating the value.

  Here, step S2 will be described.

  First, the specifying unit 4 specifies a storage battery ID (hereinafter referred to as “additional storage battery ID”) added to the state with additional information in the storage unit 3. That is, the specifying unit 4 specifies the storage battery whose state is detected.

  Subsequently, the additional unit battery ID (hereinafter referred to as “specific storage battery ID”) of the additional storage battery ID is added to the identification unit 4 from the state with additional information stored in the storage unit 3. A state with additional information (hereinafter referred to as “specific state information”) is specified. Changes in temperature, charge state SOC, and charge / discharge rate C-rate detected from the storage battery specified by the specific storage battery ID (hereinafter referred to as “specific storage battery”) based on the specific state information specified at this time, and detection thereof The transition of time is represented.

  Subsequently, the specifying unit 4 has a state (temperature, charge state SOC, and state) represented by any one of the plurality of conditions (for example, 27 conditions shown in FIG. 2) stored in the storage unit 3. The corresponding condition including the combination of the charge / discharge rate C-rate) is specified as the use condition of the storage battery 201a.

  In the present embodiment, the specifying unit 4 selects the specific state information used for specifying the use condition in order from the oldest detection time indicated by the detection time information, and each time the specific state information is selected, the specifying unit 4 selects the specific state information. The applicable condition including the state represented by the state information is specified as the use condition. At this time, the specifying unit 4 assigns the serial number assigned to the corresponding condition to the use condition that is the relevant condition. Hereinafter, the serial numbers assigned to the use conditions are shown immediately after the use conditions.

  Then, the specifying unit 4 stores the specified use condition in the storage unit 3 in association with the detection time information included in the specific state information used for specifying the use condition, and specifies the specified use condition in the deterioration coefficient determination unit 5. The storage battery ID and the additional storage battery ID are notified.

  When the degradation coefficient determination unit 5 receives the specific storage battery ID and the additional storage battery ID, the performance with additional information (hereinafter, “the additional storage battery ID” added to the performance with additional information stored in the storage unit 3). Specified performance information). The specific performance information specified at this time represents the transition of the capacity maintenance rate detected from the specific storage battery and the transition of the detection times thereof.

  Subsequently, the deterioration coefficient determination unit 5 uses the detection time information and the capacity maintenance rate represented by each specific performance information, and the detection time information associated with the use condition and the use condition, to determine the capacity maintenance rate of the specific storage battery. Create a transition graph that represents the transition of the transition and usage conditions.

  FIG. 5 is a diagram illustrating an example of a transition graph.

  In the transition graph shown in FIG. 5, the horizontal axis represents the usage time of the specific storage battery. In addition, the deterioration coefficient determination unit 5 calculates the usage time of the specific storage battery by subtracting the oldest detection time among the detection times represented by the plurality of detection time information from the detection time represented by each detection time information. .

  Further, in the transition graph shown in FIG. 5, for convenience of explanation, the usage conditions are changed so as to increase by 1 from the serial number “1” to “n” (n is an integer from 2 to p). The change of the condition is not limited to changing in the order of serial numbers.

  Subsequently, the deterioration coefficient determination unit 5 reads the reference function f (t) from the storage unit 3. As described above, the reference function f (t) is based on the u reference constants (deterioration factors) corresponding to the reference use conditions and the use time t of the storage battery 201a that is an independent variable. A reference deterioration curve representing the performance of the storage battery 201a at the time when it has elapsed is defined.

Here, the degradation coefficient in use condition 1 is a ₁ , b ₁ ,,, u ₁ , the degradation coefficient in use condition 2 is a ₂ , b ₂ ,,, u ₂ , and the degradation coefficient in use condition n is a _n , b _n ,,, u _n , by using the standard function f (t), the degradation curve under the use condition 1 is f ₁ (t, a ₁ , b ₁ ,,, u ₁ ) and the use condition 2 Is expressed as f ₂ (t, a ₂ , b ₂ ,,, u ₂ ), and the deterioration curve under operating condition n is expressed as f _g (t, a _n , b _n ,,, u _n ). it can. Hereinafter, in order to simplify the description, “a ₁ , b ₁ ,,, u ₁ ” is expressed as “a ₁ , b ₁ ,,,” and “a ₂ , b ₂ ,,, u _2”. Is represented as “a ₂ , b ₂ ,,,”, and “a _n , b _n ,,, u _n ” is represented as “a _n , b _n ,,,”.

Further, in FIG. 5, the data indicating the relationship between the capacity maintenance rate specified from each specific performance information and the usage time are (D actual measurement ₁ , t ₁ ) and (D actual measurement _{n + 1} , t _n ), respectively. .

FIG. 6 shows a transition graph shown in FIG. 5 in which a reference deterioration curve, deterioration curves for each of the usage conditions 1 to n, (D provisional ₂ , t _1,2 ), (D provisional ₃ , t _{2, 3} ) and (D tentative _n , t _{n-1, n} ).

(D tentative ₂ , t _1,2 ) indicates the relationship between the capacity retention rate and usage time at the transition between usage conditions 1 and 2, and (D tentative ₃ , t _2,3 ) The relationship between the capacity retention rate and usage time at the transition between condition 2 and usage condition 3 is shown. (D provisional _n , t _{n-1, n} ) is the value at the transition between usage condition n-1 and usage condition n The relationship between capacity maintenance rate and usage time is shown.

However, t _1,2 is the usage time at the transition between usage conditions 1 and usage conditions 2. Further, D provisional _2, is the capacity retention rate when the operating time t _{1, 2,} as shown in FIG. 5, since not detected and the capacity retention ratio when the operating time t _{1, 2} The storage battery life prediction system 1 does not have a capacity maintenance rate at the usage time t _1,2 . Therefore, here, the capacity maintenance rate at the usage time t _1,2 is defined as a provisional capacity maintenance rate, and is indicated as D provisional ₂ .

  In FIG. 6, the capacity maintenance rate data points that are actually detected are represented by black circles, and the provisional capacity maintenance rate data points that are not actually detected are represented by white circles.

If the usage conditions are in the range where acceleration degradation is possible and the degradation coefficients a ₁ , a ₂ ,,, b ₁ , b ₂ ,, are correct values,

Holds.

The left side of equation (1) represents the first time, and the right side of equation (1) is an example of a predetermined function and represents the second time.
Equation (1) means that accelerated deterioration is established. However, f ⁻¹ (D, a, b ,,,) is an inverse function of f (t, a, b ,,,).

Therefore, the deterioration coefficient determination unit 5 determines the deterioration coefficients a ₁ , a _2, ... That minimize the absolute value of the difference between the left side and the right side of equation (1) (or the square or the fourth power of the difference between the left side and the right side). An optimization calculation for calculating b ₁ , b ₂ ,, is performed to obtain deterioration coefficients a ₁ , a ₂ ,, b ₁ , b ₂ ,.

  Hereinafter, the optimization calculation executed by the deterioration coefficient determination unit 5 will be described.

  First, the degradation coefficient determination unit 5 uses the performance with additional information (specific performance information) to which the specific storage battery ID is added and the reference function f (t), as an evaluation function Z:

Create

  Subsequently, the deterioration factor determination unit 5 uses the performance with additional information to which the additional storage battery ID is added and the reference function f (t) for each other additional storage battery ID in the same procedure as described above. (2) Create an evaluation function such as an expression.

Subsequently, the degradation coefficient determination unit 5 calculates degradation coefficients a ₁ , a ₂ ,,, b ₁ , b _2, ... That minimize the sum of all the created evaluation functions.

  However, equation (2) is an evaluation function when it is determined to minimize the square of the difference between the left and right sides of equation (1), and the absolute value of the difference between the left and right sides of equation (1) is When minimizing, the right side of equation (2) is the absolute value of the difference between the left and right sides of equation (1). When minimizing the fourth power of the difference between the left and right sides of equation (1), (2) The order of the right side of the formula is 4.

(2) The evaluation function of the equation is an equation that contains temporary parameters that cannot actually be detected (measured), such as D-temporary ₂ , D-temporary ₃ , and so on. At the time of switching, using the condition (hereinafter also referred to as “connection condition”) that the capacity maintenance ratio represented by the deterioration curve of the use condition before the switch matches the capacity maintenance ratio represented by the deterioration curve of the use condition after the switch, It can be expressed by using actually detected values (performance with additional information and state with additional information). Therefore, finally, the evaluation function Z has the degradation coefficients a ₁ , a ₂ ,,, b ₁ , b ₂ ,, and detectable parameters t ₁ , t _1,2 , t _2,3 ,, t _{n-1, n} , t _n , D actual measurement ₁ and D actual _n can be expressed by an equation. Note that t _1,2 , t _2,3 ,,, t _{n-1, n} are specified using the detection time information of the state with additional information.

  A method for deleting the temporary parameter using the connection condition will be described later. When there is no temporary parameter in the evaluation function Z (when the use condition is not switched), the deterioration factor determination unit 5 uses the evaluation function Z, the performance with additional information, and the reference function f (t). Create.

  In the case of FIGS. 5 and 6, for convenience of explanation, the usage conditions are changed in order from 1 to n, but the order of the usage conditions in actual operation is arbitrary, and the expression (2) is accordingly changed. It needs to be deformed.

Subsequently, the deterioration coefficient determination unit 5 creates a deterioration coefficient table in which the calculated deterioration coefficients a ₁ , a _2, ..., B ₁ , b ₂ ,. If a deterioration coefficient table is created in advance, the deterioration coefficient determination unit 5 uses the calculated deterioration coefficients a ₁ , a ₂ ,,, b ₁ , b ₂ ,. Update.

  FIG. 7 is a diagram showing an example of the deterioration coefficient table.

  In FIG. 7, the use conditions shown in the deterioration coefficient table correspond to the conditions shown in FIG. 2, and a deterioration coefficient is shown for each use condition.

  In the deterioration coefficient table shown in FIG. 7, the use conditions are classified by three parameters of temperature, charge state SOC, and charge / discharge rate C-rate, but the parameters for classifying the use conditions are as follows. The temperature, the state of charge SOC, and the charge / discharge rate C-rate are not limited to three and can be changed as appropriate. When the parameters for classifying the use conditions are changed, the parameters for classifying the conditions shown in FIG. 2 are changed in accordance with the change.

  Step S2 is complete | finished above.

  Subsequently, in step S <b> 3, the deterioration coefficient determination unit 5 performs a function of the deterioration coefficient.

  Here, step S3 will be described.

The degradation coefficient determination unit 5 uses the degradation coefficient values shown in the degradation coefficient table created in step S2 as usage condition parameters that define each usage condition (for example, temperature, charge state SOC, and charge / discharge conditions that define the usage condition). (A combination of each value of the speed C-rate) is used to perform the fitting with an arbitrary function form, and a (P ₁ , P ₂ ,,,), b (P ₁ , P ₂ ,,,) ,, create.

However, P ₁ and P ₂ are respectively the use condition parameter 1 (for example, a combination of the temperature, the charge state SOC, and the charge / discharge rate C-rate corresponding to the use condition 1), and the use condition parameter 2 (for example, In other words, the temperature, the state of charge SOC, and the combination of the values of the charge / discharge rate C-rate corresponding to the use condition 2).

Here, when the fitting cannot be performed, the deterioration coefficient determination unit 5 may simply linearly complement the deterioration coefficient between the use conditions. Hereinafter, the functionalized deterioration coefficients a (P ₁ , P ₂ ,,,), b (P ₁ , P ₂ ,,,), created here are referred to as deterioration coefficient functions.

  Subsequently, the deterioration coefficient determination unit 5 stores the deterioration coefficient function in the storage unit 3.

  Step S3 is complete | finished above.

Subsequently, in step S4, the input unit 6 accepts a use schedule condition that represents a use schedule or a use condition to be predicted for a future deterioration prediction target storage battery. The contents (usage conditions) represented by the scheduled use conditions can be expressed by use condition parameters P ₁ , P ₂ ,. For this reason, for example, information indicating the use condition parameter corresponding to the use condition scheduled to be used or the use condition parameter corresponding to the use condition to be predicted is used as the use schedule condition.

  Further, the usage condition represented by the scheduled use condition is not limited to one, and two or more usage conditions each indicating the scheduled use period may be represented by the planned use condition.

  The scheduled use condition also represents the storage battery ID of the deterioration prediction target storage battery.

  The input unit 6 outputs the scheduled use condition to the deterioration estimation unit 7.

  Subsequently, in step S <b> 5, when the degradation estimating unit 7 receives the scheduled use condition from the input unit 6, the degradation estimation function 7 reads the degradation coefficient function from the storage unit 3 and is specified by the scheduled use condition received from the input unit 6. Using the parameter, the deterioration coefficient specified by the use condition parameter is acquired using the deterioration coefficient function.

  Subsequently, the deterioration estimation unit 7 reads the reference function f (t) from the storage unit 3 and replaces u reference constants in the reference function f (t) with the acquired deterioration coefficient.

  Then, every time the reference constant is replaced with the deterioration coefficient, the deterioration estimating unit 7 generates a deterioration curve changed from the reference deterioration curve, that is, a deterioration curve under the use condition corresponding to the replacement deterioration coefficient.

  Subsequently, the deterioration estimation unit 7 draws the generated deterioration curve in a graph as shown in FIG. The deterioration estimation unit 7 displays the graph on the output unit 8.

  FIG. 8 is a graph in the case of using two types of deterioration curves A1 and Z1 of the use condition A and the use condition Z. The horizontal axis represents the use time, and the vertical axis represents the capacity maintenance rate.

In the following, for simplification of explanation, it is assumed that the scheduled use condition indicates that “use condition A is used for time t _a1 and then use condition Z is used”.

In FIG. 8, P _{1, A} , P _{2, A} ,, P _{1, Z} , P _{2, Z} are used as usage condition parameter 1 for usage condition A, usage condition parameter 2, usage condition A for usage condition A, respectively. The usage condition parameter 1 of condition Z and the usage condition parameter 2 of usage condition Z are shown.

  Subsequently, in step S6, the deterioration estimation unit 7 predicts the remaining life using the diagram created in step S5.

  Here, step S6 will be described.

  First, the deterioration estimation unit 7 reads out the oldest and latest performance with additional information of the deterioration prediction target storage battery from the storage unit 3 using the storage battery ID of the deterioration prediction target storage battery represented in the scheduled use condition.

  Subsequently, the deterioration estimation unit 7 uses the oldest and latest performance with additional information of the deterioration prediction target storage battery, the current capacity maintenance rate of the deterioration prediction target storage battery, the usage time until the current of the deterioration prediction target storage battery, and , Ask.

  Then, the deterioration estimation part 7 is the figure by which the point g1 showing the relationship between the present capacity maintenance rate of a deterioration prediction object storage battery and the usage time until now of a deterioration prediction object storage battery is displayed on the output part 8. (See FIG. 8).

Subsequently, since the estimated use condition indicates that the use condition A is used for the time t _a1 and then the use condition Z is used, the deterioration estimation unit 7 is displayed on the output unit 8. The arrow g3 is described from the point g1 to the point g2 representing the same capacity maintenance rate as the capacity maintenance rate represented by the point g1 in the deterioration curve A1 corresponding to the use condition A that is used first.

Subsequently, the deterioration estimation unit 7 specifies a point g4 representing the capacity maintenance rate at the time when the time _{ta1 has} elapsed from the point g2 in the deterioration curve A1, and in the deterioration curve A1 displayed by the output unit 8, A life curve g5 indicating a part starting from g2 and ending at point g4 is described.

  Subsequently, in the figure displayed by the output unit 8, the deterioration estimation unit 7 starts from the point g4 and uses the capacity represented by the point g4 in the deterioration curve Z1 corresponding to the use condition Z used next to the use condition A. An arrow g7 is described toward a point g6 that represents the same capacity maintenance rate as the maintenance rate.

  Subsequently, the deterioration estimation unit 7 indicates a part of the deterioration curve Z1 displayed by the output unit 8 that starts from the point g6 and extends from the point g6 in the direction in which the capacity maintenance rate indicated by the deterioration curve Z1 decreases. The curve g8 is described.

  Then, the deterioration estimating unit 7 determines the time point (point g9) when the capacity maintenance rate is equal to or less than a threshold (for example, the capacity maintenance rate is 80% or less) in the life curve g5 or g8 displayed by the output unit 8. It is determined that the life of the storage battery subject to deterioration prediction.

  Subsequently, the deterioration estimating unit 7 sets the part indicated by the life curve g8 displayed by the output unit 8 as a part having the point g6 as the start point and the point g9 as the end point in the deterioration curve Z1.

  Here, the usage time specified by the portion indicated by the life curve g5 and the life curve g8 is the remaining life. In the case of FIG. 8, the use time ta1 + use time tz1 is the remaining life.

  In the present embodiment, for convenience of explanation, as shown in FIGS. 5, 6, and 8, the horizontal axis represents the usage time t and the vertical axis represents the capacity maintenance rate D. However, the vertical axis of the graph may be an index (for example, internal resistance or full charge capacity) that can indicate the degree of progress of deterioration of the storage battery other than the capacity maintenance rate D, and the horizontal axis represents any deterioration other than the usage time t. There may be a parameter having a correlation (charge / discharge integrated power amount, charge / discharge integrated current amount, etc.).

  Next, an example of the operation of the storage battery life prediction system 1 will be described by showing an example of the reference function f (t) indicating the reference deterioration curve.

  It is known that the standard deterioration curve of the storage battery under the fixed use condition of 1 use condition or more follows the root rule, and the storage battery is distributed and installed on the customer side under the condition that the storage battery is used arbitrarily, and the storage battery is changed from each storage battery to the storage battery. Information (capacity maintenance rate (D), temperature (T), state of charge SOC (S), charge / discharge rate C-rate (C), time tx) is obtained. The root rule is a general rule that a decrease in the capacity maintenance rate of the storage battery is proportional to the use time of the storage battery or the square root of the number of use cycles of the storage battery.

  The standard deterioration curve is

It can be expressed as

  In the equation (3), T is temperature, S is a state of charge SOC, C is a charge / discharge rate C-rate, and a (T, S, C) is a deterioration coefficient. Equation (3) means that the progress of deterioration can be expressed simply by the product of the deterioration coefficient and the square root of the usage time.

  In addition, regarding the deterioration coefficient table, three types of temperature, charge state SOC, and charge / discharge rate C-rate are used as parameters for partitioning use conditions, and the use classification of each parameter is divided into three. That is, a deterioration coefficient table as shown in FIG. 7 is created. Since there are three types of parameters for partitioning the use conditions, the deterioration coefficient table is a three-dimensional table. For convenience of description, this three-dimensional deterioration coefficient table is represented using a total of three tables for each charge / discharge rate C-rate. There are 27 types of usage conditions in total, and from equation (3), there is only one type of deterioration coefficient for each usage condition.

  In addition, a new degradation coefficient called b is introduced to create a standard degradation curve.

However, this time, in order to simplify the calculation, only a is used as the deterioration coefficient, and Equation (3) is adopted as the reference deterioration curve.

  First, in step S1, the communication unit 2 chronologically transmits information (performance with additional information and state with additional information) related to deterioration of the storage battery from a large number of storage battery devices 201 to 20s distributedly installed in the consumer. Get as data. Here, time series data representing the capacity maintenance rate, temperature, charge state SOC, charge / discharge rate C-rate, and detection time detected (measured) from the start of use of each storage battery 201a to the present is acquired. The communication unit 2 records these time series data in the storage unit 3.

  Next, in step S2, the deterioration coefficient table shown in FIG. 7 is completed.

  Step S2 when the usage history of a certain storage battery is as shown in FIG. 9 will be described.

In FIG. 9, the capacity maintenance rate is detected at the usage times t ₀ , t ₁ , t ₃ , and t ₅ , and the period of the usage times t _{0 to} t ₂ is the usage condition 4 and the period of the usage times t _{2 to} t ₄ . conditions of use 13, the period of use time t ₄ ~t ₅ is a diagram showing a case in which the storage battery is used in conditions of use 22.

In this case, the identifying unit 4, by using the additional information with the state, the use conditions 4, and usage conditions 13 and use conditions 22 specifies the operating time t ₂ and t _4.

Then, the degradation coefficient determination unit 5 evaluates the expression (2) for each of the usage times t _{0 to} t ₁ , the usage times t _{1 to} t _3, and the usage times t _{3 to} t ₅ within the capacity maintenance rate detection period. Create a function. Note that the degradation coefficient determination unit 5 specifies the usage times t ₀ , t ₁ , t _3, and t ₅ using the performance with additional information.

The evaluation function at the usage time t _{0 to} t ₁ is

It becomes.

  Note that there is no provisional value in equation (5). For this reason, the degradation coefficient determination part 5 specifies each value shown by (5) Formula using the performance with additional information.

The evaluation function in the use time t ₁ ~t ₃ is,

It becomes.

The evaluation function in the use time t ₃ ~t ₅ is,

It becomes.

Note that D provisional ₂ exists in the upper part of the right side of equation (6), and D provisional ₄ exists in the upper part of the right side of equation (7). These are based on the connection conditions between the usage conditions. The values actually detected (values shown in the performance with additional information and values shown in the state with additional information) can be used.

Here, a method for representing D provisional ₂ and D provisional ₄ using values actually detected will be described.

FIG. 10 is a diagram illustrating a case where the use condition has changed once (changed from the use condition h ₁ to the use condition h ₂ ) within the capacity retention rate detection period.

In Figure 10, the degradation curve f _h1 on the terms of use h _1, and the degradation curve f _h2 on the terms of use h _2, measured values of the capacity maintenance ratio "D measured _1", and "D measured _2", the capacity retention rate The usage times “t _h1 ” and “t _h3 ” when “D actual measurement ₁ ” and “D actual measurement ₂ ” are actually measured are shown. The capacity maintenance rates “D actual measurement ₁ ”, “D actual measurement ₂ ”, and usage times “t _h1 ” and “t _h3 ” can be expressed by using the values shown in the performance with additional information.

The deterioration curve f _h1 is f _h1 = D = f (t, a _h1 ) = 100−a _h1 t ^0.5 (8)
The deterioration curve f _h2 is f _h2 = D = f (t, a _h2 ) = 100−a _h2 t ^0.5 (9)
And can be expressed respectively.

In addition, the use condition is switched at the use time t _h2 , and the provisional capacity maintenance rate at that time is D provisional. The usage time t _h2 can be expressed using a value indicated in the information with additional information.

Further, in the deterioration curve f _h1 , the usage time for which the capacity retention rate is the same as the temporary capacity maintenance rate D is assumed to be t ′ _h2 . Further, in the deterioration curve f _h2 , a usage time at which the same capacity maintenance ratio as the provisional capacity maintenance ratio D provisional is assumed is t ″ _h2 . Further, in the deterioration curve f _h1 , the usage time when the capacity maintenance rate is the same as the capacity maintenance rate D actual measurement _{1 is} assumed to be t ′ _h1 . Further, in the deterioration curve f _h2 , the usage time at which the capacity maintenance rate becomes the same as the capacity maintenance rate D actual measurement ₂ is defined as t ′ _h3 .

Here, when a _h1 and a _h2 are correct values, the following holds.
(t ' _h2 − t' _h1 ) + (t ' _h3 − t'' _h2 ) = t _h3 − t _h1
Therefore, a _h1 and a _h2 may be determined so that the value of the following equation (10) is minimized.
[(t _h3 -t _h1 )-(t ' _h2 -t' _h1 )-(t ' _h3 -t'' _h2 )] ² … (10)
Here, when calculating t ' _h2 , t' _h1 , t ' _h3 , t'' _h2 from _Eqs . (8) and (9),

If a _h1 and a _h2 are correct values, the following equation (15) holds.
t ' _h2 -t' _h1 = t _h2 -t _h1 → t ' _h2 = t _h2 -t _h1 + t' _h1 (15)
Here, substituting equation (15) into equation (11) and transforming it,
D provisional = 100 − a _h1 (t _h2 -t _h1 + t ' _h1 ) ^0.5 (16)
Thus, by substituting equation (12) into equation (16), D provisional can be expressed using a value actually detected.

  Next, substituting (11), (12), (13), and (14) into (10),

Is obtained.

  Substituting equation (16) into equation (17) and transforming it,

It becomes.

Here, the above expression (6) is the same as the expression (18) in the case of t _h2 → t ₂ , t _h3 → t ₃ , t _h1 → t ₁ , D actual measurement ₂ → D actual measurement 3, a _h2 → a ₁₃ , a _h1 → it is equivalent to the case of a _4.

Further, the above equation (7) is the same as the equation (18) in the case of t _h2 → t ₄ , t _h3 → t ₅ , t _h1 → t ₃ , D actual measurement ₂ → D actual measurement ₅ , a _h2 → a ₂₂ , a _h1 → a Equivalent to case ₁₃ .

This completes the description of the method of representing D tentative ₂ and D tentative ₄ using values actually detected.

  For each storage battery ID, the degradation coefficient determination unit 5 creates an evaluation function using the state with additional information to which the storage battery ID is added and the performance with additional information for each storage battery ID.

The degradation coefficient determination unit 5 creates the degradation coefficient table shown in FIG. 7 by obtaining the degradation coefficients a ₁ , a _2, ... A ₂₇ that minimize the sum of all the created evaluation functions. If the use condition does not change within the capacity maintenance rate detection period, the deterioration coefficient determination unit 5 calculates the deterioration coefficient without using a temporary value.

  Subsequently, in step S3, the deterioration coefficient determination unit 5 performs a function of the deterioration coefficient.

  First, the degradation coefficient determination unit 5 fits the degradation coefficient table values created in step S2 in an arbitrary function form with T, S, and C as arguments, and creates a (T, S, C). .

  This time, the deterioration rate increases exponentially with respect to the state of charge SOC and the charge / discharge time C-rate according to the Arrhenius rule for the temperature T (expression expressing the rate of chemical reaction under a certain temperature). Using the following equation (19) created by introducing the assumption, the degradation coefficient determination unit 5 performs fitting.

  Subsequently, the degradation coefficient determination unit 5 derives α, β, and γ in the equation (19) using values in the degradation coefficient table of FIG.

  However, equation (19) is an equation created based on the above assumptions, and it is desirable to introduce that equation when there is a dependency that has been clarified more physically. If the fitting cannot be performed here, the deterioration coefficient determination unit 5 may simply simply linearly complement the deterioration coefficient values between the use conditions in the deterioration coefficient table.

  Subsequently, in step S4, the input unit 6 accepts a scheduled use condition.

This time, the scheduled use condition represents the following contents.
First, T = 23 degrees C, S = 60% to C = 0.1 for 1.5 hours discharge (hereinafter referred to as “scheduled use E1”),
Subsequently, T = 26 degrees C, S = 45%, 3 hours storage (hereinafter referred to as “E2 scheduled to be used”),
Subsequently, at T = 22 degrees C, charge for 1 hour at S = 45% to C = 0.2 (hereinafter referred to as “scheduled use E3”),
Thereafter, it is stored at T = 28 ° C. and S = 65% (hereinafter referred to as “E4 scheduled to be used”).

  If the usage conditions in this case are written on a graph, it will become like FIG.

  Subsequently, in step S5, the deterioration estimating unit 7 creates a deterioration curve for each use condition based on the use condition (see FIG. 11) specified from the use scheduled condition received in step S4. A graph is drawn as shown in FIG. 12, and the graph is displayed on the output unit 8.

In this case, the deterioration estimation unit 7 uses the following five types of deterioration functions in order to express the use conditions of the use schedules E1 to E4. However, this time, for convenience of explanation, T is in increments of 1 degree C (T = ,,, 21 degrees C, 22 degrees C, 23 degrees C, 24 degrees C ,,,), S is 20% (S = 10%, 30%, 50%, 70%, 90%), C is in increments of 0.1C (C = 0.0.1, 0.2, ...). For this reason, for example, when S = 41% to 60%, the usage condition is rounded to S = 50%.
Conditions of use F1 (corresponding to planned use E1):

Conditions of use F2 (corresponding to the planned use E2):

Conditions of use F3 (corresponding to planned use E3):

Conditions of use F3´ (corresponding to the planned use E3):

Use condition F4 (corresponding to E4 scheduled to be used):

  The deterioration estimation unit 7 draws the deterioration curves indicated by these five deterioration functions in a graph as shown in FIG. 12 and displays the graph on the output unit 8.

  Subsequently, in step S6, the deterioration estimation unit 7 predicts the remaining life using the diagram created in step S5.

  First, the deterioration estimation unit 7 acquires the current capacity maintenance rate of the storage battery that is the target of deterioration prediction, and describes the acquisition result j1 in the graph.

  Subsequently, the deterioration estimation unit 7 projects the obtained result j1 onto the deterioration curve of the use condition F1 as indicated by the arrow j2 in FIG. 12, and then the storage battery deteriorates under the use condition as indicated by the arrow j3. Assuming that

  In this case, the degradation estimation unit 7 will use the storage battery subject to degradation prediction for 1.5 hours in the usage conditions F1, 3 hours in the usage conditions F2, and 1 hour in the usage conditions F3 and F3 ′. After that, the remaining life when the product is continuously used under the use condition F4 is predicted.

  Since t ′ can be calculated by assuming that the capacity maintenance rate is less than 80% under the use condition F4 as the life, the deterioration estimation unit 7 uses the remaining life for the time and the use condition under the use condition F1. It is represented by the sum of the time used in F2, the time used in the use condition F3 and the use condition F3 ′, and t ′ used in the use condition F4. That is, the deterioration estimating unit 7 calculates the remaining life = 1.5 + 3 + 1 + t ′. The deterioration estimation unit 7 displays the remaining life on the output unit 8.

  Next, the effect of this embodiment will be described.

  According to the present embodiment, the specifying unit 4 classifies the state information according to the state of the storage battery, and specifies the use condition of the storage battery including the state of the storage battery included in the state information. The degradation coefficient determination unit 5 determines the degradation coefficient under use conditions using the performance information.

  For this reason, it becomes possible to obtain | require the degradation coefficient on use conditions using the performance information and status information about a storage battery in which a degradation test is not implemented. Accordingly, a storage battery other than the storage battery on which the deterioration test is performed can be used as the storage battery used for obtaining the deterioration coefficient. Moreover, since the deterioration test can be eliminated, it is possible to reduce the cost cost and time cost required for the deterioration test.

  In addition, the said effect classifies state information according to the state of the storage battery, and specifies the use condition of the storage battery including the state of the storage battery included in the state information, and using the performance information under the use condition. This is also achieved by a deterioration coefficient determination system that includes a deterioration coefficient determination unit 5A that determines the deterioration coefficient.

  FIG. 13 is a diagram illustrating a deterioration coefficient determination system including a specifying unit 4A and a deterioration coefficient determination unit 5A.

  Moreover, in this embodiment, the degradation coefficient determination part 5 specifies 1st time (for example, the left side of (1) Formula) showing the length of the use time slot | zone of the storage battery 201a using transition of the detection time of performance. . Moreover, the deterioration coefficient determination part 5 is the storage battery in the specific use conditions which are the use conditions (for example, use conditions 1-n of FIG. 5) specified using the state detected at the time within the use time zone of the storage battery 201a. The performance of 201a is specified using performance information or performance information and status information. In addition, the deterioration coefficient determination unit 5 is a predetermined function (for example, (1)) that represents a use time during which the storage battery 201a is used under the specific use condition based on the performance of the storage battery under the specific use condition and the deterioration coefficient of the specific use condition. The second time representing the usage time is specified using the right side of the formula. Then, the deterioration coefficient determination unit 5 determines a deterioration coefficient that minimizes the absolute value of the difference between the first time and the second time. For this reason, it becomes possible to determine the deterioration coefficient with high accuracy.

  Moreover, in this embodiment, the specific | specification part 4 specifies the applicable conditions containing either of the states which state information represents among the several conditions divided beforehand by the state of a storage battery as a use condition. For this reason, it becomes possible to obtain | require the deterioration coefficient corresponding to applicable conditions.

  In the present embodiment, the input unit 6 receives a scheduled use condition that represents at least one of the use conditions specified by the specifying unit 4. The deterioration estimating unit 7 uses the deterioration coefficient determined by the deterioration coefficient determining unit 5 with respect to the use condition represented in the scheduled use condition, and displays the transition of the deterioration of the storage battery under the use condition represented in the planned use condition. A degradation curve is generated. For this reason, it becomes possible to represent the transition prediction of the deterioration of the storage battery under the use condition represented in the scheduled use condition by the deterioration curve.

  Further, in the present embodiment, when the use schedule condition represents a plurality of use conditions, the deterioration estimation unit 7 generates a deterioration curve for each of the plurality of use conditions, and uses the plurality of deterioration curves according to the use schedule condition. It represents the transition of deterioration. For this reason, even when a plurality of use conditions are used, it is possible to represent a transition prediction of deterioration of the storage battery.

  Moreover, in this embodiment, it becomes possible to raise the precision of a degradation coefficient by increasing the amount of the information regarding degradation of the storage battery received from the storage battery apparatuses 201-20s.

  In the present embodiment, for example, a lithium ion battery, a lead storage battery, a sodium sulfur battery, or a nickel hydride battery may be used as the storage battery, but the storage battery is not limited to these, and can be changed as appropriate. Further, the present embodiment is not limited to estimation of secondary battery deterioration, but can also be used for estimation of fuel cell deterioration. In that case, temperature can be used as state information, and power generation efficiency can be used as performance information.

  In the present embodiment, the storage battery life prediction system 1 and the deterioration coefficient determination system 9 may be realized by a computer. In this case, the computer reads and executes a program recorded on a recording medium such as a CD-ROM (Compact Disk Read Only Memory) that can be read by the computer, so that the storage battery life prediction system 1 and the deterioration coefficient determination system 9 are read. The function which has is performed. The recording medium is not limited to the CD-ROM and can be changed as appropriate. Further, this program may be distributed to a computer via a communication line, and the computer that has received this distribution may execute this program.

  In the embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

DESCRIPTION OF SYMBOLS 1 Storage battery life prediction system 2 Communication part 3 Memory | storage part 4, 4A specific part 5, 5A Deterioration coefficient determination part 6 Input part 7 Deterioration estimation part 8 Output part 8A Display part 9 Deterioration coefficient determination system 10 Arithmetic processing part 11 Storage battery life prediction apparatus 101 communication network 201-20s storage battery device 201a storage battery 201b control unit

Claims (5)

The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in each of the plurality of sections, and the determined time A specifying means for specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition Determining means for determining a value for each use condition;
Have
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
The determining means includes
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
The absolute value of the difference between the first time and the second time, or the value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. , Degradation coefficient determination system. A degradation coefficient determination system according to claim 1;
Condition receiving means for receiving a scheduled use condition representing at least one of the use conditions specified by the specifying means;
A deterioration transition line representing a transition of deterioration of the storage battery under the use condition represented in the scheduled use condition, using the degradation coefficient determined by the determining means with respect to the use condition represented in the planned use condition. And a generation means for generating the deterioration prediction system. The deterioration prediction system according to claim 2,
The generation means generates the deterioration transition line for each of the plurality of usage conditions when the scheduled use condition represents a plurality of usage conditions, and uses the plurality of deterioration transition lines to generate the plurality of usage conditions. A deterioration prediction system representing the transition of the deterioration in A degradation coefficient determination method executed by a degradation coefficient determination system,
The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in each of the plurality of sections, and the determined time A specific step of specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition A determination step for determining a value for each use condition;
Have
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
The determining step includes
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
The absolute value of the difference between the first time and the second time, or the value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. Deterioration coefficient determination method. On the computer,
The state of the storage battery is divided into a plurality of sections in advance, and the state at each time of the storage battery detected from the storage battery is determined to be included in which of the plurality of sections, and the determined time A specific procedure for specifying each segment as a use condition at each time of the storage battery;
Using the performance information that represents the transition of the performance of the storage battery and the state information that represents the transition of the state of the storage battery, the degradation coefficient that is a coefficient included in the degradation curve representing the transition of the degradation of the storage battery for each use condition A determination procedure for determining a value for each use condition;
Is to execute
The performance includes at least one of a capacity maintenance rate, a resistance, and a full charge capacity of the storage battery, and the performance information represents a transition between the performance and a detection time of the performance,
The state includes at least one of a temperature of the storage battery, a state of charge SOC, a charge / discharge rate C-rate, a voltage, and a current, and the state information represents a transition between the state and the detection time of the state. Is,
In the determination procedure,
The first time indicating the length of the usage time zone of the storage battery is specified using the transition of the detection time of the performance,
The performance information, or the performance information and the status information are used to identify the performance of the storage battery in a specific usage condition identified using the status detected at a time within the usage time zone of the storage battery,
The length of the usage time zone is calculated using a predetermined function representing the usage time when the storage battery is used under the specific usage condition, including the performance of the storage battery under the specific usage condition and a deterioration coefficient indicated by a variable. The second time shown is calculated as a mathematical formula,
An absolute value of a difference between the first time and the second time, or a value of the deterioration coefficient that minimizes the second power of the difference between the first time and the second time (n is a natural number) is determined. For the program.