Operating condition presentation device and operating condition presentation method

Abstract

To provide an operation condition presentation device which presents an operation condition that minimizes a total cost of a storage battery system.SOLUTION: An operation condition presentation device 1 according to one embodiment comprises: a service life calculation unit 2 which calculates a period of service of a storage battery by using a deterioration rate of the storage battery in each of a plurality of operation conditions; a cost calculation unit 3 which calculates for each of the plurality of operation conditions, a total cost about the storage battery required in an operation period of an apparatus mounted with the storage battery by using the plurality of periods of service and an operation cost of the storage battery; and a condition selection unit 4 which selects the operation condition that minimizes the total cost by comparing the total costs with each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to an operating condition presentation device and an operating condition presentation method.

Background Art

[0002] It is known that the life of a storage battery mounted in a storage battery system changes according to its operating conditions. If the life of the storage battery mounted in the storage battery system is short, the total cost during the operation period of the storage battery system increases. Therefore, it is desirable to select appropriate operating conditions for the storage battery.

[0003] The life of the storage battery is determined according to the SOC range and the initial storage battery capacity, and the cost for the entire storage battery system is determined according to the operation period. By presetting the operating conditions of the storage battery system, the operation cost of the storage battery system can be kept low.

[0004] Conventionally, in order to optimize the operation cost of a storage battery system, a system has been proposed that calculates price information of a plurality of storage batteries and the life of the storage batteries, and determines current distribution to the plurality of storage batteries.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Embodiments of the present invention have been made in view of the above circumstances, and an object thereof is to provide an operating condition presentation device and an operating condition presentation method that present operating conditions for minimizing the total cost related to a storage battery in a storage battery system.

Means for Solving the Problems

[0007] An operating condition suggestion device according to one embodiment includes: a life calculation unit that calculates the usage period of a storage battery using the degradation rate of the storage battery in each of a plurality of operating conditions; a cost calculation unit that calculates the total cost required for each of the plurality of operating conditions for the operating period of the equipment in which the storage battery is installed, using the plurality of usage periods and the operating cost of the storage battery; and a condition selection unit that compares the plurality of total costs and selects the operating condition in which the total cost is minimized. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing one example of the configuration of an operating condition presentation device according to the first embodiment. [Figure 2] Figure 2 is a flowchart illustrating an example of the operation condition presentation process of the operation condition presentation device according to the first embodiment. [Figure 3] Figure 3 shows an example of the simulation results of the total cost of multiple storage batteries with different operating conditions in the operating condition presentation device according to the first embodiment. [Figure 4] Figure 4 is a flowchart illustrating an example of the operation condition presentation process of the operation condition presentation device according to the second embodiment. [Figure 5] Figure 5 shows an example of the simulation results of the total cost of multiple storage batteries with different operating conditions in the operating condition presentation device according to the second embodiment. [Modes for carrying out the invention]

[0009] The operating condition presentation device according to the embodiment will be described in detail below with reference to the drawings. Note that the scale of each part in the drawings used in the description of the embodiment below has been changed as appropriate. Also, in the drawings used in the description of the embodiment below, some components may be omitted for illustrative purposes.

[0010] [First Embodiment] Figure 1 is a schematic diagram showing one example of the configuration of an operating condition presentation device according to the first embodiment. The operating condition suggestion device 1 of this embodiment is a device that suggests the operating conditions that result in the lowest cost during the operation period of the battery storage system.

[0011] The operating condition suggestion device 1 according to this embodiment suggests the operating conditions that result in the lowest cost during the operating period of the battery system (equipment equipped with a battery) using a battery model constructed for each of various types of batteries. However, it is not limited to this, and it is also possible to perform the above processing using, for example, an actual battery.

[0012] A battery model is a table or formula that outputs at least one of the following values: the battery capacity (usable capacity) and the internal resistance of a battery, in response to external input values. A battery model can be created, for example, using previously measured characteristic values ​​of a battery.

[0013] The operating condition presentation device 1 may have a configuration similar to that of a general-purpose computer. For example, the operating condition presentation device 1 includes a communication unit that receives information from the outside and transmits information to the outside, and a storage unit that stores information from the battery. The communication unit receives the charge / discharge current value and ambient temperature from the battery. The operating condition presentation device 1 may further include an input unit for the user to input information and an output unit that outputs information to the user.

[0014] The operating condition presentation device 1 includes a life calculation unit 2, a cost calculation unit 3, a condition selection unit 4, and a bus communication line BL. The lifespan calculation unit 2 and the cost calculation unit 3 are connected to each other via a bus communication line BL. The lifespan calculation unit 2 and the cost calculation unit 3 may also be configured to communicate with each other via wireless communication.

[0015] Furthermore, the cost calculation unit 3 and the condition selection unit 4 are connected to each other via a bus communication line BL. The cost calculation unit 3 and the condition selection unit 4 may also be configured to communicate with each other via wireless communication.

[0016] The life calculation unit 2 is equipped with a battery model prepared in advance. The life calculation unit 2 only needs to be equipped with a battery model of at least one type of battery. The life calculation unit 2 inputs the charge / discharge current value, SOC range, environmental temperature, initial battery capacity (battery cell capacity, number of parallel connections), and deterioration characteristics into the battery model, and obtains at least one of the available capacity value and internal resistance value of the battery from the battery model. The deterioration characteristics of the battery are the characteristics of the available battery capacity and internal resistance that change according to the operating conditions of the battery. Note that the operating conditions in this embodiment include the SOC range and the initial battery capacity.

[0017] The life calculation unit 2 calculates the deterioration rate (at least one of the capacity deterioration rate or the internal resistance deterioration rate) of the battery from the change amounts of the obtained available capacity value and internal resistance value, and calculates the usage period of the battery using the deterioration rate of the battery. The life calculation unit 2 changes the SOC range and the initial battery capacity, which are the operating conditions of the battery, calculates the deterioration rate of the battery for a plurality of operating conditions, and calculates the usage period of the battery for each of the plurality of operating conditions. The life calculation unit 2 outputs the calculated usage period to the cost calculation unit 3.

[0018] As the deterioration rate of the battery, for example, a capacity deterioration rate at which the capacity of the battery decreases or an internal resistance deterioration rate at which the internal resistance of the battery increases can be used. The capacity deterioration rate of the battery is assumed to be 100% at the start of use of the battery and decreases as the deterioration of the battery progresses, and it may be a value obtained by calculating the ratio of the available capacity to the initial battery capacity of the battery.

[0019] The internal resistance deterioration rate of the battery is assumed to be 0% at the start of use of the battery and increases as the deterioration of the battery progresses, and it may be a value obtained by calculating the ratio of the initial internal resistance to the internal resistance of the battery. Also, it may be a value calculated by combining the capacity deterioration rate and the internal resistance deterioration rate.

[0020] Note that the usage period of the storage battery refers to the period from the start of use of the storage battery (at least one of the capacity degradation rate of 100% or the internal resistance degradation rate of 0%) to the point when the degradation rate of the storage battery satisfies predetermined conditions, and the conditions used here are determined in advance by the designer of the storage battery system or the like.

[0021] The cost calculation unit 3 is input with the usage period of the storage battery, the operation period of the storage battery system, and the cost (storage battery cost). The storage battery cost includes the price of the storage battery and the cost required for replacing the storage battery, and may also include other maintenance costs of the storage battery.

[0022] The cost calculation unit 3 acquires the plurality of usage periods output by the life calculation unit 2, and calculates the total cost related to the storage battery required during the operation period of the storage battery system using the input storage battery cost and the usage period.

[0023] The total cost related to the storage battery can be calculated, for example, when the operation period of the storage battery system is divisible by the usage period of the storage battery, by (operation period of the storage battery system / usage period of the storage battery) × storage battery cost, and when the operation period of the storage battery system is not divisible by the usage period of the storage battery, by ((operation period of the storage battery system / usage period of the storage battery) + 1) × storage battery cost. The cost calculation unit 3 calculates the total cost related to the storage battery under each of the plurality of operating conditions associated with the plurality of usage periods.

[0024] The condition selection unit 4 compares the plurality of total costs calculated based on the plurality of operating conditions, and selects and outputs at least the operating condition that minimizes the total cost. Note that the condition selection unit 4 may select and output a plurality of operating conditions based on the total cost.

[0025] Hereinafter, an example of the procedure for selecting the operating condition that minimizes the total cost related to the storage battery from among the plurality of operating conditions by the operating condition presentation device 1 of the first embodiment will be described. Note that the content of the processing in the following description of the operation is an example, and various processes that can obtain the same effect can be appropriately used.

[0026] Figure 2 is a flowchart illustrating an example of the operation condition presentation process of the operation condition presentation device according to the first embodiment. The operating condition presentation device 1 sets a parameter list of operating conditions that combine the state of charge (SOC) range of the storage battery and the initial battery capacity (step S1). The parameter list is set by associating the SOC range, initial battery capacity, and number based on values ​​entered by the user, for example. The number in the parameter list is n (where n is a natural number), and the maximum number is n_max.

[0027] In step S1, the operating condition presentation device 1 sets the SOC range SOC(n) included in the parameter list. For example, when the parameter number n=1, the SOC range is SOC(1)=0-100, when n=2, SOC(2)=20-100, and so on.

[0028] Furthermore, in step S1, the operating condition presentation device 1 sets the initial battery capacity CAP(n) of the storage battery. For example, when the parameter number n=1, CAP(1)=20, when n=2, CAP(2)=25, and so on.

[0029] Next, the operating condition presentation device 1 refers to the parameter list set in step S1 and sets the SOC range for n=1 (step S2). Similarly, the operating condition presentation device 1 refers to the parameter list set in step S2 and sets the initial battery capacity for n=1 (step S3).

[0030] The lifespan calculation unit 2 acquires the operating conditions set in steps S2 and S3. The lifespan calculation unit 2 also calculates the service life using the charge / discharge current value, ambient temperature, degradation characteristics, operating conditions, and battery model (step S4).

[0031] The life calculation unit 2 inputs the charge / discharge current value, ambient temperature, degradation characteristics, and operating conditions into the battery model, calculates the slope of the degradation rate from the change in at least one of the internal resistance value or the battery capacity value, and calculates the period until the degradation rate satisfies the predetermined conditions.

[0032] Specifically, if the degradation rate is the capacitance degradation rate, the lifetime calculation unit 2 calculates the period until the capacitance degradation rate falls below a preset first threshold. If the degradation rate is the internal resistance degradation rate, the lifetime calculation unit 2 calculates the period until the internal resistance degradation rate rises above a preset second threshold.

[0033] Furthermore, if the degradation rate is the capacitance degradation rate and the internal resistance degradation rate, the lifetime calculation unit 2 calculates the period until the earlier of the time when the capacitance degradation rate falls below the first threshold or the internal resistance degradation rate rises above the second threshold. The lifetime calculation unit 2 may also calculate the period until the time when the capacitance degradation rate falls below the first threshold and the internal resistance degradation rate rises above the second threshold.

[0034] The battery's charge / discharge current, ambient temperature, and degradation characteristics are values ​​entered by the user, and the battery model is assumed to be pre-configured in the lifespan calculation unit 2. The lifespan calculation unit 2 outputs the period from the start of battery operation to the calculation time as the battery's usage period (lifespan) to the cost calculation unit 3.

[0035] The cost calculation unit 3 obtains the battery usage period output by the lifespan calculation unit 2. The cost calculation unit 3 also obtains the operating period and the cost of the battery, which are input by the user of the equipment (battery system) in which the battery is installed. From the above information obtained, the cost calculation unit 3 calculates the total cost required during the operating period of the battery system (step S5).

[0036] Specifically, the cost calculation unit 3 calculates how many times the battery needs to be replaced during the operation period of the battery storage system based on its usage period, and calculates the total cost (Cost) by multiplying the number of replacements, including the initial purchase, by the battery cost, and outputs this to the condition selection unit 4.

[0037] The condition selection unit 4 compares the preset minimum total cost value Cost_min with the total cost Cost output by the cost calculation unit 3 and performs processing according to the comparison result (step S6). In step S6, if the comparison result shows that the total cost Cost is smaller than the minimum total cost value Cost_min (step S6, YES), the condition selection unit 4 updates the minimum total cost value Cost_min to the total cost Cost (step S7).

[0038] The condition selection unit 4 sets the parameter number n of the operating condition for the total cost Cost as the parameter number i of the minimum value of the total cost Cost_min (step S8).

[0039] On the other hand, in step S6, if the total cost Cost is greater than or equal to the minimum total cost Cost_min (step S6, NO), the condition selection unit 4 skips the processing in steps S7 and S8 and proceeds to the processing in step S9.

[0040] The condition selection unit 4 determines whether the current parameter number n is the maximum value n_max for parameter numbers (step S9). If the condition selection unit 4 determines that the current parameter number n is less than or equal to the maximum value n_max for parameter numbers (step S9, NO), it proceeds to the process in step S10.

[0041] The condition selection unit 4 increments the current parameter number n by 1 and updates the parameter number (step S10). The condition selection unit 4 applies the parameter number n+1 updated in step S10 to the SOC range, updates the value of the SOC range (SOC(n+1)) by referring to the parameter list, and outputs it to the lifetime calculation unit 2 (step S11).

[0042] The condition selection unit 4 applies parameter number n+1 to the initial battery capacity in the same manner as described above, updates the value of the initial battery capacity (CAP(n+1)) by referring to the parameter list, and outputs it to the life calculation unit 2 (step S12).

[0043] The operating condition presentation process of the operating condition presentation device 1 repeats the process from step S4 to step S12 until the parameter number n in the parameter list reaches the maximum value n_max of the preset parameter numbers.

[0044] If the condition selection unit 4 determines that the current parameter number n is the same as the maximum value n_max of the parameter numbers (step S9, YES), it proceeds to the process in step S13.

[0045] The condition selection unit 4 selects the minimum total cost value Cost_min output by the cost calculation unit 3 and the values ​​of the operating conditions SOC(n) and CAP(n) corresponding to the parameter number n set in step S8, and outputs them to an external monitor or the like (step S13).

[0046] Figure 3 shows an example of the simulation results of the total cost of multiple storage batteries with different operating conditions in the operating condition presentation device according to the first embodiment. In Figure 3, line A1 shows the capacity degradation rate of the battery model under operating condition 1 (SOC range: 0-100 [%], initial battery capacity: X × 1 [Ah]), and line A2 shows the total cost of the battery model under operating condition 1. Line B1 shows the capacity degradation rate of the battery model under operating condition 2 (SOC range: 20-100 [%], initial battery capacity: X × 1.25 [Ah]), and line B2 shows the total cost of the battery model under operating condition 2.

[0047] Comparing line A1 and line B1, line A1 reaches the lower limit of its capacity degradation rate faster than line B1, indicating that when the battery is used under operating condition 1, the battery's lifespan is shorter than when it is used under operating condition 2. Furthermore, comparing line A2 and line B2, it can be seen that at the end of the operational period, line A2 (operating condition 1) has a higher total cost than line B2 (operating condition 2).

[0048] Based on the above, at the end of the battery storage system's operational period, the frequency of battery replacement is lower under operating condition 2 than under operating condition 1. Even if the battery cost is higher under operating condition 2, the total cost is lower under operating condition 2.

[0049] According to the operating condition presentation device 1 of this embodiment, the battery usage period and the total cost of the battery can be calculated under multiple operating conditions, and the operating condition that results in the lowest total cost can be selected. This makes it possible to know the optimal SOC range and battery capacity of the battery in advance through simulation before constructing a system such as equipment that will be equipped with the battery.

[0050] As described above, the operating condition presentation device and operating condition presentation method of this embodiment can present operating conditions that minimize the total cost related to the battery in a battery storage system.

[0051] [Second Embodiment] The basic configuration of the operating condition presentation device 1 in the second embodiment is the same as that of the operating condition presentation device 1 shown in Figure 1 of the first embodiment, so a description will be omitted. The following describes an example of a procedure for selecting the operating condition that minimizes the total cost of the storage battery from among multiple operating conditions using the operating condition suggestion device 1 of the second embodiment. Note that the processing content in the following description of the operation is an example, and various processes that can achieve similar effects can be used as appropriate. Note that the operating conditions in this embodiment are within the SOC range, and the initial battery capacity of the storage battery is assumed to be the same for all conditions.

[0052] Figure 3 is a flowchart illustrating an example of the operation condition presentation process of the operation condition presentation device according to the second embodiment. The operating condition presentation device 1 sets the SOC range of the storage battery as an operating condition in the parameter list (step S14). The parameter list is set up by associating the SOC range with a number, for example, based on a value entered by the user. Let the number in the parameter list be n (where n is a natural number), and let the maximum number be n_max.

[0053] In step S14, the operating condition presentation device 1 sets the SOC range SOC(n) included in the parameter list. For example, when the parameter number n=1, the SOC range is SOC(1)=0-100, when n=2, SOC(2)=20-100, and so on.

[0054] Next, the operating condition presentation device 1 refers to the parameter list set in step S1 and sets the SOC range for n=1 (step S15). The operating condition presentation device 1 sets the initial battery capacity CAP (step S16). Note that the initial battery capacity CAP is not to be updated during the operating period.

[0055] The lifespan calculation unit 2 acquires the operating conditions set in step S15. The lifespan calculation unit 2 also calculates the service life using the charge / discharge current value, ambient temperature, degradation characteristics, operating conditions, and battery model (step S17).

[0056] The life calculation unit 2 inputs the charge / discharge current value, ambient temperature, degradation characteristics, and operating conditions into the battery model, calculates the slope of the degradation rate from the change in at least one of the internal resistance value or the battery capacity value, and calculates the period until the degradation rate satisfies the predetermined conditions.

[0057] Specifically, if the degradation rate is the capacitance degradation rate, the lifetime calculation unit 2 calculates the period until the capacitance degradation rate falls below a preset first threshold. If the degradation rate is the internal resistance degradation rate, the lifetime calculation unit 2 calculates the period until the internal resistance degradation rate rises above a preset second threshold.

[0058] Furthermore, if the degradation rate is the capacitance degradation rate and the internal resistance degradation rate, the lifetime calculation unit 2 calculates the period until the earlier of the time when the capacitance degradation rate falls below the first threshold or the internal resistance degradation rate rises above the second threshold. The lifetime calculation unit 2 may also calculate the period until the time when the capacitance degradation rate falls below the first threshold and the internal resistance degradation rate rises above the second threshold.

[0059] The battery's charge / discharge current, ambient temperature, and degradation characteristics are values ​​entered by the user, and the battery model is assumed to be pre-configured in the lifespan calculation unit 2. The lifespan calculation unit 2 outputs the period from the start of battery operation to the calculation time as the battery's usage period (lifespan) to the cost calculation unit 3.

[0060] The cost calculation unit 3 obtains the battery usage period output by the lifespan calculation unit 2. The cost calculation unit 3 also obtains the operating period and the cost of the battery, which are input by the user of the equipment (battery system) in which the battery is installed. From the above information obtained, the cost calculation unit 3 calculates the total cost required during the operating period of the battery system (step S18).

[0061] Specifically, the cost calculation unit 3 calculates how many times the battery needs to be replaced during the operation period of the battery storage system based on its usage period, and calculates the total cost (Cost) by multiplying the number of replacements, including the initial purchase, by the battery cost, and outputs this to the condition selection unit 4.

[0062] The condition selection unit 4 compares the preset minimum total cost value Cost_min with the total cost Cost output by the cost calculation unit 3 and performs processing according to the comparison result (step S19). In step S19, if the comparison result shows that the total cost Cost is smaller than the minimum total cost value Cost_min (step S19, YES), the condition selection unit 4 updates the minimum total cost value Cost_min to the total cost Cost (step S20).

[0063] The condition selection unit 4 sets the parameter number n of the operating condition for the total cost Cost as the parameter number i of the minimum value of the total cost Cost_min (step S21).

[0064] On the other hand, in step S19, if the total cost Cost is greater than or equal to the minimum total cost Cost_min (step S19, NO), the condition selection unit 4 skips the processing in steps S20 and S21 and proceeds to the processing in step S22.

[0065] The condition selection unit 4 determines whether the current parameter number n is the maximum value n_max for parameter numbers (step S22). If the condition selection unit 4 determines that the current parameter number n is less than or equal to the maximum value n_max for parameter numbers (step S22, NO), it proceeds to the process in step S23.

[0066] The condition selection unit 4 increments the current parameter number n by 1 and updates the parameter number (step S23). The condition selection unit 4 applies the parameter number n+1 updated in step S23 to the SOC range, updates the value of the SOC range (SOC(n+1)) by referring to the parameter list, and outputs it to the lifetime calculation unit 2 (step S24).

[0067] The operating condition presentation process of the operating condition presentation device 1 repeats the process from step S17 to step S24 until the parameter number n in the parameter list reaches the maximum value n_max of the preset parameter numbers.

[0068] If the condition selection unit 4 determines that the current parameter number n is the same as the maximum value n_max of the parameter numbers (step S22, YES), it proceeds to the process in step S25. The condition selection unit 4 selects the minimum total cost value Cost_min output by the cost calculation unit 3 and the value of the operating condition SOC(n) corresponding to the parameter number n set in step S21, and outputs it to an external monitor or the like (step S25).

[0069] Figure 5 shows an example of the simulation results of the total cost of multiple storage batteries with different operating conditions in the operating condition presentation device according to the second embodiment. In Figure 5, line C1 shows the capacity degradation rate of the battery model under operating condition 3 (SOC range: 20-100%), and line C2 shows the total cost of the battery model under operating condition 3. Line D1 shows the capacity degradation rate of the battery model under operating condition 4 (SOC range: 11-100%), and line D2 shows the total cost of the battery model under operating condition 4.

[0070] Comparing line C1 and line D1, line D1 reaches the lower limit of its capacity degradation rate faster than line C1, indicating that when the battery is used under operating condition 4, the battery's lifespan is shorter than when it is used under operating condition 3. On the other hand, comparing line C2 and line D2, the total cost at the end of the operating period is the same for both line C2 (operating condition 3) and line D2 (operating condition 4).

[0071] Based on the above, at the end of the battery system's operational period, the battery replacement frequency under operating condition 3 and operating condition 4 will be the same, and the total cost will also be the same. When the total cost is the same, operating condition 4, which is the maximum value of the SOC range, is selected.

[0072] According to the operating condition suggestion device 1 of this embodiment, the battery usage period and the total cost of the battery are calculated under multiple operating conditions, and the operating condition that results in the lowest total cost can be selected. Furthermore, even if the initial battery capacity and the minimum total cost are the same during the operating period, the battery system can be used efficiently by selecting the maximum value of the SOC range, which is the operating condition.

[0073] As described above, the operating condition presentation device and operating condition presentation method of this embodiment can present operating conditions that minimize the total cost related to the battery in a battery storage system.

[0074] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents.

[0075] For example, in the operating condition presentation device and operating condition presentation method of the above embodiment, the operating period of the battery system is fixed and the operating conditions that result in the lowest total cost related to the battery are presented. However, the device may be configured to present the operating period that results in the lowest total cost under predetermined operating conditions. The original claims of this application are included below. [C1] A lifespan calculation unit calculates the usage period of the storage battery using the degradation rate of the storage battery under each of several operating conditions, A cost calculation unit calculates the total cost of the battery required for the operating period of the equipment in which the battery is installed, for each of the multiple operating conditions, using the multiple usage periods and the cost of the battery. A condition selection unit that compares multiple total costs and selects the operating conditions that result in the lowest total cost, A device equipped with an operating condition presentation device. [C2] The life calculation unit calculates the degradation rate using a battery model that outputs at least one of the usable capacity value and the internal resistance value of the battery for the operating conditions, and defines the usage period as the period from the start of use of the battery until the point in time when the degradation rate satisfies a predetermined condition. A device for presenting operating conditions as described in C1. [C3] The aforementioned degradation rate includes at least one of the capacity degradation rate or the internal resistance degradation rate of the storage battery. The life calculation unit defines the usage period as at least one of the period from the start of use of the storage battery until the capacity degradation rate falls below a first threshold, or until the internal resistance degradation rate falls above a second threshold. A device for presenting operating conditions as described in C2. [C4] The aforementioned operating conditions include the State of Operation (SOC) range in which the battery is used and the initial battery capacity of the battery. A device for presenting operating conditions as described in C3. [C5] The aforementioned operating conditions include the SOC range in which the storage battery is used. The life calculation unit calculates the degradation rate for multiple storage batteries having the same initial battery capacity when used within different State of Charge (SOC) ranges. A device for presenting operating conditions as described in C3. [C6] The life calculation unit, The charge / discharge current value, ambient temperature, degradation characteristics, and the operating conditions are input to the battery model. The slope of the degradation rate is calculated from the change in at least one of the internal resistance value or usable capacity value obtained from the aforementioned battery model. A device for indicating operating conditions as described in C4 or C5. [C7] When the operating conditions are updated, the life calculation unit calculates the usage period of the battery using the degradation rate of the battery under the updated operating conditions. A device for presenting operating conditions as described in C1. [C8] The battery's lifespan is calculated using the battery's degradation rate under each of several operating conditions. Using the multiple usage periods and the operating costs of the battery, the total cost related to the battery required during the operating period of the equipment in which the battery is installed is calculated for each of the multiple operating conditions. The operating conditions that result in the lowest total cost are selected by comparing multiple total costs. How to present operating conditions. [Explanation of symbols]

[0076] 1...Operating condition presentation device 2…Life calculation section 3…Cost calculation unit 4...Condition Selection Section

Claims

1. A lifespan calculation unit calculates the usage period of the storage battery using the degradation rate of the storage battery under each of several operating conditions, A cost calculation unit calculates the total cost of the battery required for the operating period of the equipment in which the battery is installed, for each of the multiple operating conditions, using the multiple usage periods and the cost of the battery. A condition selection unit that compares multiple total costs and selects the operating conditions that result in the lowest total cost, A device equipped with an operating condition presentation device.

2. The life calculation unit calculates the degradation rate using a battery model that outputs at least one of the usable capacity and internal resistance of the battery for the operating conditions, and defines the usage period as the period from the start of use of the battery until the point in time when the degradation rate satisfies a predetermined condition. The operating condition presentation device according to claim 1.

3. The aforementioned degradation rate includes at least one of the capacity degradation rate or the internal resistance degradation rate of the storage battery. The life calculation unit defines the usage period as at least one of the period from the start of use of the storage battery until the capacity degradation rate falls below a first threshold, or until the internal resistance degradation rate falls above a second threshold. The operating condition presentation device according to claim 2.

4. The aforementioned operating conditions include the SOC range in which the storage battery is used and the initial battery capacity of the storage battery. The operating condition presentation device according to claim 3.

5. The aforementioned operating conditions include the SOC range in which the storage battery is used. The life calculation unit calculates the degradation rate for multiple storage batteries having the same initial battery capacity when used within different SOC ranges. The operating condition presentation device according to claim 3.

6. The life calculation unit, The charge / discharge current value, ambient temperature, degradation characteristics, and operating conditions are input to the battery model, and the slope of the degradation rate is calculated from the change in at least one of the internal resistance value or usable capacity value obtained from the battery model. The operating condition presentation device according to claim 4 or 5.

7. When the operating conditions are updated, the life calculation unit calculates the usage period of the battery using the degradation rate of the battery under the updated operating conditions. The operating condition presentation device according to claim 1.

8. In an operating condition presentation device, The lifespan calculation unit calculates the usage period of the storage battery using the degradation rate of the storage battery under each of several operating conditions. The cost calculation unit uses the multiple usage periods and the operating costs of the battery to calculate the total cost related to the battery required during the operating period of the equipment in which the battery is installed, for each of the multiple operating conditions. The condition selection unit compares multiple total costs and selects the operating condition that results in the lowest total cost. How to present operating conditions.

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