JP7185590B2 - Electricity storage system, battery sales method, and battery counting system - Google Patents

Description

The present invention relates to an electric storage system, a battery sales method, and a battery counting system.

Industrial power storage systems include, for example, a solar power generation system, a wind power generation system, and a peak cut system. Here, the peak shaving system is a system for reducing electricity charges by using photovoltaic power for self-consumption, reducing the amount of power, and lowering the contract demand.

In Patent Document 1, a plurality of storage batteries with different charge/discharge characteristics are used for the purpose of extending the life of the storage batteries while further mitigating fluctuations in the power generated by the power generation system. Disclosed is a power auxiliary system that calculates an index value indicating the degree of spread of a distribution of charge/discharge power command values based on a history of values, and switches a storage battery to be charged/discharged among a plurality of storage batteries based on the calculated index value. It is

JP 2016-54607 A

The power auxiliary system described in Patent Document 1 is based on the premise that there is no price difference between the plurality of batteries used, and by switching the storage battery to be charged and discharged based on the charging and discharging situation, This is intended to extend the life of the battery.

However, when cheap batteries with a short life such as used batteries are introduced to the market, it is more economical to use cheap batteries intensively to lower the average life cycle cost (LCC) of batteries. is.

SUMMARY OF THE INVENTION It is an object of the present invention to determine current distribution to a plurality of batteries in a case where cheap batteries with a short life and expensive batteries with a long life coexist.

The power storage system of the present invention includes a plurality of batteries and a control unit, and the control unit stores price information of each of the plurality of batteries and a current or power value required for the plurality of batteries as a whole. and are obtained, the current deterioration sensitivity is used to calculate the current life ratio, and the value of the current to be distributed to each of the plurality of batteries is calculated.

According to the present invention, it is possible to determine current distribution to a plurality of batteries in a case where cheap batteries with a short life and expensive batteries with a long life coexist.

1 is a schematic configuration diagram showing an example of a power storage system according to a first embodiment; FIG. 4 is a graph conceptually showing acceleration of deterioration of a battery. 4 is a graph for explaining the principle for estimating current deterioration sensitivity; 4 is a graph showing a method of estimating the current degradation sensitivity of each of two batteries; It is a graph which shows the estimation method of storage-deterioration life. 4 is a graph showing an example of current distribution in the present invention; FIG. 2 is a schematic configuration diagram showing an example of a power storage system according to a second embodiment; FIG. It is a figure which shows the structure regarding the sales method of the battery of this invention. 4 is a graph showing current distribution when a power type battery and a capacity type battery are combined. FIG. 4 is a flow diagram showing a method for controlling a battery in the power storage system according to the first embodiment;

First, the principle of the present invention will be explained.

The life cycle cost (LCC ₎ of the entire power storage system is Σ{C( k)÷Y _k (I(k), k)}. where I(k) is the current in battery k.

Minimizing the LCC is the objective optimization problem. Minimizing LCC is synonymous with minimizing running costs.

Battery life Y _k (I(k),k) is approximately a function of temperature and current.

Since an industrial power storage system is installed in a container with an air conditioner, the temperature can be considered constant.

Therefore, if the above optimization problem is solved by Lagrange's method of undetermined multipliers, the value of C(k)×f(k)÷Y _k (I(k), k) ² should be equal. where f is the current deterioration sensitivity [years/A] and is defined as ∂Y _k (I(k),k)/∂I(k).

In the present invention, means for acquiring the current deterioration sensitivity f(k) of each battery k, means for estimating g(k)=(C(k)×f(k)) ^0.5 , f and g, A means for determining the current distribution is provided to determine the current distribution and control the battery current.

In the present invention, if the life of each battery is about the same, the operation cost is reduced by concentrating the current on the battery with the lower initial cost (purchase price) and increasing the rotation speed of the battery with the lower cost. If the initial cost is the same, the current is concentrated in the long-life battery to lower the operating cost.

Note that the initial cost of the battery is also referred to as "price information".

An embodiment of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments, and includes various modifications and application examples within the technical concept of the present invention. For example, the system described below is applicable not only to solar and wind power storage batteries and peak cut systems, but also to HEMS (Home Energy Management System), BEMS (Building Energy Management System), FEMS (Factory Energy Management System), and railways. Applicable. This system can also be said to be a system for planning the operation of batteries of different types.

One of the features of such a configuration is, for example, the following configuration.

A power conditioning subsystem (PCS: Power Conditioning Subsystem, also known as a "power conditioner") distributes current to each of a mixture of used battery packs and new battery packs. The PCS can set charging/discharging currents by AC/DC conversion, and is equipped with a general controller that controls each PCS.

The general controller includes a part that estimates the current deterioration sensitivity (the rate at which battery life is shortened due to an increase in battery charge/discharge current), a target life ratio calculation part, and current distribution based on the current deterioration sensitivity and the target life ratio. It has the desired current distribution section. The initial cost of each battery pack and the current required for the battery system are input to the general controller.

According to the configuration as described above, it is possible to determine the frequency of use of the battery according to the cost and life, and to keep the operation cost low on a time average (including battery replacement). The above configuration is an example, and the present invention is not limited to the above configuration.

In the following description, when the same type of elements are described without distinguishing between them, common parts (parts excluding the branch numbers) of the reference numerals including the branch numbers are used to distinguish between the same types of elements. In some cases, reference signs with branch numbers are used.

(1) First Embodiment This embodiment is an example having two types of batteries (battery packs).

FIG. 1 is a configuration diagram showing an example of a power storage system.

In this figure, the power storage system includes a general controller 10 , power conditioners 12 and 13 (PCS), and batteries 14 and 15 . Batteries 14, 15 are connected to an external load 11 that supplies or consumes power. The load 11 is a solar cell system, a wind power generation system, building electrical equipment, or the like. A power conditioner 12 is installed between the battery 14 and the load 11 . A power conditioner 13 is installed between the battery 15 and the load 11 . Here, the battery 14 is a new battery A (new battery), and the battery 15 is a used battery B (used battery). Power conditioners 12 and 13 are controlled by a general controller 10 .

The general controller 10 has a program realized by any one of a PC (Personal Computer), a business terminal, a PLC (Programmable Logic Controller), an embedded microcomputer, or a combination thereof.

The general controller 10 includes a current distributor 16 , a target life ratio calculator 17 , and a current deterioration sensitivity estimator 18 . The current distribution unit 16 sends commands for respective outputs to the power conditioners 12 and 13 . A current deterioration sensitivity estimator 18 estimates the current deterioration sensitivity f of the batteries 14 and 15 .

The general controller 10 receives current or power requested by the load 11 (referred to as "requested current" and "required power", respectively). Also, initial prices (initial values of costs) of the batteries 14 and 15 are input to the general controller 10 . Then, the general controller 10 is sent the output value of the distributed current or power to each of the power conditioners 12 and 13 .

Initial cost values of the batteries 14 and 15 are recorded in the target life ratio calculator 17 . The target life ratio calculator 17 calculates the target life ratio λ to calculate The current distribution unit 16 uses the current deterioration sensitivity f, the target life ratio λ, etc. to calculate the distribution of the outputs of the batteries 14 and 15 (the ratio of the output current or the output power), and issues commands to the power conditioners 12 and 13. send.

The principle of the present invention will be described in detail below.

First, the current degradation sensitivity f is defined.

Deterioration of the battery is generally accelerated as the charging/discharging current to the battery increases.

FIG. 2 is a graph conceptually showing acceleration of battery deterioration. The horizontal axis represents charge/discharge current, and the vertical axis represents battery life.

A charge/discharge current is a current value when a constant current continues to flow continuously. In the case of charging, charging is continued until the battery reaches full charge (capacity upper limit in battery specifications). On the other hand, in the case of discharging, discharging is continued until the lower limit of capacity is reached. Since the direction of the current differs between charging and discharging, the horizontal axis represents the absolute value of the current. Regarding the setting of the upper limit value and the lower limit value of charging/discharging, even if charging and discharging are repeated within the range of the standard deviation of the current, the same result as in this figure is obtained.

A central SOC and DOD may be used to measure or estimate battery life. Here, DOD is an abbreviation for Depth Of Discharge and means depth of discharge. In other words, it is the capacity [Ah] when switching between discharging and charging.

This figure shows a graph under the condition that the center SOC and DOD remain unchanged and only the current during charging and discharging changes.

Similarly, the life of the battery also changes depending on the temperature, but in the case of an industrial power storage system, the battery is generally housed in an air-conditioned container, so the temperature can be considered constant. Also, since the DOD is set to the upper and lower limits of the SOC of the battery, the center SOC and DOD are substantially fixed.

In this figure, the larger the current, the shorter the life. That is, the slope of the curve is negative. In the region where the charge/discharge current is small, the slope of the curve is often almost constant. A current degradation sensitivity f is defined as a value obtained by multiplying this slope (slope in a portion where the slope is constant over a relatively wide range) by (-1).

This current deterioration sensitivity f is held as a constant if it is provided by the battery company and the value is unchanged (when the value does not change due to deterioration). However, if the battery company does not provide it, or if the value changes due to deterioration, it must be estimated in some way.

This estimation method will be described below.

As this method, a learning phase is provided at the beginning of system installation, immediately after replacing one battery, or periodically (every few years).

FIG. 3 is a graph for explaining the principle for estimating the current deterioration sensitivity f.

This figure shows the change in SOH (capacity SOH) over time when a single battery is first loaded with a current of 0 and then with a current of I (this is the standard deviation). A period of current 0 is represented by a dashed curve, and a period of current I is represented by a solid curve. SOH can be measured or estimated by existing methods. Note that SOH is an index indicating the state of deterioration of the battery, and is an abbreviation for State Of Health.

As shown in this figure, before and after changing the current from 0 to I (before and after switching the current), the slope of SOH (temporal rate of change) changes. Regarding this slope, the value immediately before switching the current is m ₁ , and the value immediately after switching is m ₂ .

Here, the SOH of the battery is represented by the following equation (1) as an approximation of an exponential function. In the formula, t is time, f is current degradation sensitivity, I is current, and b is a constant.

The SOH actually deviates from the exponential function, but when the state of the battery is changed, a phenomenon of sudden discontinuity occurs, and the term expressed by the exponential function cannot be ignored. Therefore, the approximation is exponential function×correction function. Since the term of the exponential function is large, the above equation (1) is obtained by approximating the coefficient of the exponential function with the current linear portion. Since the battery is replaced when the SOH reaches a certain value κ (for example, 0.7), the battery life T is approximated by the following equation (2) from the above equation (1). Note that κ is called "exchanged SOH".

On the other hand, m ₁ and m ₂ are approximated by the following expressions (3) and (4) from the above expression (1).

Therefore, m ₁ ÷m ₂ is approximated as (−fI+b)/b.

Therefore, f becomes the following formula (5).

Since b remains on the right side of the above equation (5), I=0 is substituted into the above equation (2) and used as T=−log(κ)×b. In this case, T is the battery life (storage deterioration life L) when the current is zero. That is, when the current is 0, T is equal to the storage deterioration life L. Therefore, in this case, b=-L/log(κ), and f is determined by the following equation (6).

Therefore, if L is known, then f can be calculated.

Next, a method for measuring current degradation sensitivity when using two batteries will be described.

FIG. 4 is a graph showing changes in SOH over time for each of the two batteries. In the figure, the battery A is indicated by a solid curve, and the battery B is indicated by a dashed curve.

As shown in the figure, in the first half, the current of battery A is set to 0 and only battery B is used for several months, and in the second half, the current of battery B is set to 0 and only battery A is used for several months. The slope of the curve is calculated using this measured value of SOH. If the standard deviation of the current in each period when only battery A or only battery B is used is I, in principle, the current deterioration sensitivity f of battery A and battery B can be obtained using the above equation (6). be done.

In this figure, regarding the slope of SOH before and after switching the batteries to be used, the value immediately before switching regarding battery A is m _A1 , the value immediately after switching is m _A2 , the value immediately before switching regarding battery B is m _B1 , and the value immediately after switching. be m _B2 . In this case, by applying the above formula (6), the current deterioration sensitivity f _A of the battery A and the current deterioration sensitivity f _B of the battery B can be calculated from the following formulas (7) and (8), respectively. The suffixes A and B mean that they correspond to the battery A and the battery B, respectively.

If the shelf life L is provided by the manufacturer, it can be used. If the storage deterioration life L is unknown, it is estimated by the following method.

FIG. 5 is a graph showing changes over time in SOH when batteries A and B are used under the same conditions as in FIG. In the figure, the solid-line curve is the SOH actually measured with the battery current set to 0, and the dashed-line curve is the SOH obtained by exponentially extrapolating when the state of the solid-line curve continues thereafter. is. For simplicity, extrapolation may be performed using a straight line having the slope of the curve at the right end of the actual curve.

Let L A and L _B be the times when the value indicated by the dashed curve of battery A and battery _B becomes the value of replacement SOH(κ), respectively.

Through the steps described above, the current deterioration sensitivity estimator 18 of FIG. 1 estimates the current deterioration sensitivities f _A and f _B and stores the result as data. That is, in the power storage system, when a battery is newly connected or when the battery is replaced, the general controller 10 of FIG. 1 performs battery-related learning (learning phase). Also for the storage deterioration life L, estimated results are accumulated.

The target life ratio calculator 17 in FIG. 1 stores the input battery cost data (initial value).

Assuming that the cost of battery A is C _A and the cost of battery B is C _B , the value of target life ratio λ is obtained from the following equation (9) using current deterioration sensitivities f _A and f _B .

Next, the current distribution unit 16 in FIG. 1 will be described.

FIG. 6 is a graph showing an example of current distribution. The horizontal axis represents the absolute value of the current required from the host system (for example, the load 11 side in FIG. 1), and the vertical axis represents the absolute value of the current distributed to each of the two batteries. Here, a negative value (this is defined as "discharging" and a positive value is defined as "charging"), for example, if -100A is the requested current, specify the value of 100A on the horizontal axis . When battery A has a value of 80 A and battery B has a value of 20 A, a current of -80 A to battery A and -20 A to battery B is actually distributed.

In FIG. 6, battery A and battery B are each a segmented straight line. In this example, it is assumed that the current deterioration sensitivities f _A and f _B and the costs C _A and C _B of the battery A and the battery B are equivalent, and the storage deterioration life L of the battery A is shorter. Therefore, since the battery B has a longer life, the solution is to concentrate the current on the battery B. Then, in the range where the absolute value of the required current is equal to or less than the threshold, the current of the battery A is set to 0 as shown in the figure.

Next, how to obtain the segmented straight line shown in FIG. 6 will be described.

By approximating the battery life as Lf×I and substituting it into the minimum cost condition “λ×battery B life (I _b )=battery A life (I _a )”, the following formula (10) is obtained. . The suffixes a and b mean that they correspond to the battery A and the battery B, respectively.

However, since the current _Ib obtained by the above equation (10) does not allow a negative value, it is a segmented straight line that sets the current to 0 when the value is negative.

In this example, since the sum of battery A and battery B is equal to the required current in the system, the following formula (11) holds.

Simultaneously solving the above equations (10) and (11) yields the following equations (12) and (13).

Here, in the above equations (12) and (13), since the right side cannot be a negative value, it is set to 0 when the calculation result is negative.

This is summarized in FIG.

In this case, since the instantaneous value of I is distributed as it is, the equation holds regardless of whether the charging/discharging current on the horizontal axis in FIG. 2 is the standard deviation or the absolute value.

However, the power storage system may not have a battery charging/discharging period, and the above discussion may not hold. This case will be described below.

First, the capacity Qa of battery _A and the capacity _Qb of battery B are calculated using the following equations (14) and (15).

Next, the planned current distribution is determined by the following equations (16) and (17).

If the current is negative in this solution, set the current to zero. Here, if Qa=Qb/λ, the current distribution shown in FIG. 6 is obtained.

A combination of a power type battery (low sensitivity to current deterioration and high cost) and a capacity type battery (high sensitivity to current deterioration and low cost) results in a solution as shown in FIG. 9 instead of FIG. In FIG. 9, battery A is a power type, and battery B is a capacity type. The vertical axis and horizontal axis in this figure are the same as in FIG.

Assume that the target lifetime ratio λ is well above one. Then, L _a tends to be sufficiently smaller than λL _b , and λf _b tends to be sufficiently larger than f _a .

In this case, the intercept of _Ia becomes negative and the slope approaches 1 in the above equation (12).

The meaning of FIG. 9 is that the current below the threshold is covered by the capacitive battery if the value is below the threshold, and the current exceeding the threshold is shared by the power battery, thereby reducing the operating cost. Note that the current distribution unit normally operates, receives the requested current at each cycle (for example, 0.1 s), and sends a command to the PCS.

In addition, as the current distribution unit, the battery life should be "Battery A life = λ x Battery B life" instead of specifying a value, so the distribution ratio may be increased or decreased. . Battery life can be estimated from the SOH history of the last few months. Then, if "battery A life < λ x battery B life", the current distribution ratio to battery B is increased, and if "battery A life > λ x battery B life", the current distribution to battery A is increased. , if "battery A life ≈ λ x battery B life", then maintain the current allocation. This proportional allocation is updated periodically (every few months).

FIG. 10 summarizes the above contents of the battery control method in the power storage system according to the first embodiment.

As shown in this figure, in the power storage system, when replacing or adding a battery pack, the cost (purchase cost) of the battery pack is input (S110).

The current, SOH, etc. of each battery pack are measured (S120). A current deterioration sensitivity f is calculated using the slope of SOH and the like shown in FIG. 3 and the like (S130). A target life ratio λ is calculated using the current deterioration sensitivity f and the like (S140).

A requested current I is obtained (S150).

The value of the current to be distributed is calculated by the method shown in FIG. 6 and the like (S160).

Based on the result of step S160, a command is sent to each battery pack (S170).

As described above, the effect of reducing the running cost of the battery can be obtained.

(2) Second Embodiment FIG. 7 shows an example of a power storage system according to a second embodiment.

This figure shows an example in which three or more battery packs are included.

Only differences from FIG. 1 will be described below.

In FIG. 7, the power storage system includes power conditioners 113a, 113b, 113n and batteries 115a, 115b, 115n. The batteries 115a, 115b, 115n are connected to an external load 11 that supplies or consumes power through power conditioners 113a, 113b, 113n, respectively.

In the learning phase of the current deterioration sensitivity f, the currents of the batteries 115a, 115b, and 115n are sequentially set to 0, and the remaining batteries are used. Calculate the ratio λ.

The following formula (18) is a calculation formula when the current of the second battery 115b is sequentially set to 0 and the remaining batteries are used. The following formula (19) is a general formula, and is a calculation formula when the current of the n-th battery is sequentially set to 0 and the remaining batteries are used (n is an integer of 3 or more).

Then, as a current distribution formula, battery 1 life (battery 1 current) = λ ₂ × battery 2 life (battery 2 current) = ... = λ _n × battery n life (battery n current) and Σ battery k current = Solve the simultaneous equations for I (required current). If a negative solution is obtained, the value is set to 0.

Also, when the current allocation is obtained using the above equations (16) and (17), the following equation (20) is used instead of the above equations (14) and (15) to determine _Qk .

Then, instead of the above equations (16) and (17), the simultaneous equations of the following equations (21) and (22) are solved.

As described above, even if there are n battery packs, it can be handled.

(3) Other Embodiments This embodiment relates to a system or method for aggregating and trading information in the secondary market of batteries including used batteries.

The first and second embodiments are for actual use of batteries. However, if the information on the current deterioration sensitivity f is available when the battery is sold, it will be an added value of the battery. This system is described.

There are cases where battery pack dealers measure the current deterioration sensitivity f using a device and add information as added value when selling batteries, and dealers who use electric vehicles (EV) resell used batteries. In some cases, the current deterioration sensitivity f is obtained based on the data in use and resold. Let's talk about each.

When the battery pack manufacturer measures the current deterioration sensitivity f using a charging/discharging device, the current deterioration sensitivity f is obtained according to the principle shown in FIG.

In the case of businesses that use electric vehicles, a mechanism for collecting OBD data of electric vehicles will be provided. Here, OBD means on-board diagnostics (OBD). It is assumed that the OBD includes time series of battery current, voltage, temperature, SOC, and SOH. Then, OBDs are collected in a higher-level center server via a communication device.

FIG. 8 schematically shows the configuration related to the method of selling batteries of the present invention, and shows an IoT system (battery counting system) of an EV dealer or the like.

In this figure, the center server is a component of the battery counting system, and has a database, counting unit, input section, output section, and the like. The center server acquires current standard deviation, center SOC, battery average temperature, DOD, SOH history, etc. (history information) for each vehicle (EV or the like) and stores them in a database.

Next, only the same battery model number of each vehicle is aggregated, and the current deterioration sensitivity f is aggregated. By taking the battery life on the vertical axis and the current standard deviation of each company on the horizontal axis (upper right graph in this figure), the current deterioration sensitivity f can be obtained from the slope of the curve (straight line) obtained from the aggregated data. The current deterioration sensitivity f is presented as product information when the battery is sold.

For the battery life, for example, the number of years until the SOH (EV usage pattern) reaches 0.7 (this is obtained from the SOH history) is used. However, the temperature should be the same (for example, only 25° C.). Here, the number of years on the vertical axis is different from that for industrial use, but from the relationship of the above equation (2), the value is multiplied by a constant even for industrial use, and a proportional relationship is established.

However, individual batteries may have deteriorated and the values may be off. In this case, the slope of a straight line connecting the point of storage deterioration (an EV that has hardly been used is taken as a representative point) and the point of the vehicle in question.

Hereinafter, the battery sales method and the battery counting system according to the present embodiment will be collectively described.

A battery sales method includes (1) acquiring and storing history information including a history of deterioration of the battery and a current standard deviation of the battery, (2) estimating the service life of the battery from the history of deterioration, (3) Calculate the current deterioration sensitivity of the battery from the life of the battery and the current standard deviation of the battery, and (4) Present the current deterioration sensitivity as product information when the battery is sold.

As a result, in the process of distributing batteries including used batteries, it is possible to promote the supply of batteries that are easily compatible with the power storage system.

Historical information includes the average temperature of the battery.

The current degradation sensitivity is calculated for batteries of the same type.

A battery counting system includes a database, a counting unit, and an output unit. (1) The database acquires and stores history information including a history of deterioration of the battery and a standard deviation of the current of the battery. (2) The counting unit estimates the life of the battery from the deterioration state history, calculates the current deterioration sensitivity of the battery from the battery life and the current standard deviation of the battery, and stores the current deterioration sensitivity in the database for product information. (3) The output unit presents the current deterioration sensitivity as product information when the battery is sold.

As a result, in the process of distributing batteries including used batteries, it is possible to promote the provision of product information on batteries applied to power storage systems.

Moreover, the above-described configurations may be appropriately changed, rearranged, combined, or omitted within the scope of the present invention.

According to the present invention, battery life can be extended.

10: general controller, 11: load, 12, 13: power conditioner, 14, 15: battery, 16: current distributor, 17: target life ratio calculator, 18: current degradation sensitivity estimator.

Claims (11)

a plurality of batteries;
a control unit;
The control unit acquires price information of each of the plurality of batteries and a value of current or power required for all of the plurality of batteries, and calculates a current life ratio using current deterioration sensitivity. and calculating a current value to be distributed to each of the plurality of batteries. The control unit provides a period in which the current of any one of the plurality of batteries is 0, and then energizes, and the deterioration state of the one battery immediately before and after the energization changes over time. 2. The power storage system according to claim 1, wherein said current deterioration sensitivity is calculated from a rate. 3. The power storage system according to claim 2, wherein said current deterioration sensitivity is calculated after replacing said one battery or periodically. In the magnitude relationship considering the current life ratio of the lifetimes of any two of the plurality of batteries, more current is distributed to the larger battery, and the two batteries are equal in the magnitude relationship. 3. The power storage system of claim 2, wherein the current sharing is maintained when the current is on. 5. The power storage system of claim 4, wherein the current distribution is adjusted periodically. Acquiring and accumulating history information including a history of deterioration of the battery and a current standard deviation of the battery;
estimating the life of the battery from the history of the deterioration state;
calculating the current deterioration sensitivity of the battery from the life of the battery and the current standard deviation of the battery;
A method of selling a battery, wherein the current deterioration sensitivity is presented as product information when the battery is sold. 7. The battery sales method according to claim 6, wherein said history information includes an average temperature of said battery. 7. The battery sales method according to claim 6, wherein said current deterioration sensitivity is calculated for batteries of the same type. comprising a database, an aggregation unit, and an output unit,
The database acquires and accumulates history information including a history of deterioration of the battery and a current standard deviation of the battery,
The aggregation unit is
estimating the life of the battery from the history of the deterioration state;
calculating the current deterioration sensitivity of the battery from the life of the battery and the current standard deviation of the battery;
transmitting the current deterioration sensitivity to the database as product information;
The battery counting system, wherein the output unit presents the current deterioration sensitivity as the product information when the battery is sold. 10. The battery counting system according to claim 9, wherein said history information includes an average temperature of said battery. 10. The battery counting system according to claim 9, wherein said current deterioration sensitivity is calculated for batteries of the same type.

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