JP7400706B2 - battery system - Google Patents

Description

The present disclosure relates to a battery system, and more particularly, to a battery system that can determine whether a battery is a genuine product.

Patent Document 1 discloses that the weight of a battery pack at the time of shipment is compared with the current weight of the battery pack, and based on the difference, it is determined whether a battery pack is a genuine product or a non-genuine product. Further, Patent Document 2 discloses determining whether or not a battery should be replaced based on the internal resistance of the battery, and Patent Document 3 discloses determining whether a battery is a genuine product or a non-genuine product based on a voltage value.

Japanese Patent Application Publication No. 2012-174487 Japanese Patent Application Publication No. 2008-65989 JP2012-252896A

In the conventional method described above, if the battery is an all-solid-state type battery, it is difficult to distinguish a non-genuine product from a genuine product if the weight, internal resistance, and voltage match those of a genuine product. Therefore, it could not be said that the accuracy of determining whether a product is a genuine product or a non-genuine product (compatible product) is high. In the case of all-solid-state batteries, it is difficult to make highly accurate determinations unless specific parameters are taken into consideration to distinguish between genuine and non-genuine products.
The present disclosure has been made in view of the above-mentioned circumstances, and its main purpose is to provide a battery system that can determine with higher accuracy whether a genuine battery is a non-genuine battery.

As one means for solving the above problems, the present application provides a battery system that determines whether a battery is regular or non-genuine, and includes a calculation device that determines whether the battery is regular or non-regular, and the calculation device has a predetermined Px, which is the relationship between the state of charge and the load value of the battery cell during charging of the original battery, is expressed as Py, which is the relationship between the state of charge and the load value of the battery cell during charging of the actual battery cell. In contrast, a battery system is disclosed that performs calculations to determine that the product is a genuine product when Px and Py are equivalent, and to determine that it is a non-genuine product when Px and Py are not equivalent.

According to the present disclosure, it is possible to improve the accuracy of determining whether a battery is a genuine product or a non-genuine product.

FIG. 1 is a diagram conceptually showing a battery system 10. As shown in FIG. FIG. 2 is a diagram showing the flow of the battery determination method S10. FIG. 3 is a diagram showing the relationship Px between the SOC and the load value obtained in advance. FIG. 4 is a diagram showing the relationship Py between the actually acquired SOC and load value. FIG. 5 is a diagram showing an example of comparison between Px and Py (Py1, Py2).

1. Battery System Hereinafter, the battery system of the present disclosure will be described by way of example embodiments. FIG. 1 conceptually shows a battery system 10 according to one example. In this embodiment, a battery system 10 installed in a car will be described as an example. As can be seen from FIG. 1, the battery system 10 includes a battery 11, a charge/discharge controller 12, a load sensor 13, an SOC detector 14, and a battery determiner 15. Each component will be explained below.

1.1. Battery The battery 11 is a rechargeable and dischargeable secondary battery, and in this embodiment, an all-solid-state battery will be described as an example. All-solid-state batteries are well-known, but a positive electrode layer, a negative electrode layer, and a solid electrolyte layer arranged between the positive electrode layer and the negative electrode layer form a battery cell, and a plurality of the battery cells are stacked together. It is a battery that has been used.

1.2. Charge/Discharge Controller The charge/discharge controller 12 is a device that controls charging/discharging of a battery while monitoring battery status (current, voltage, temperature, etc.). )") is connected to the battery 11. Known charging/discharging equipment can be used as such charging/discharging equipment.

1.3. Load Sensor The load sensor 13 is a sensor that detects the load applied to the battery cells included in the battery, and is disposed in the battery 11. The type of sensor is not particularly limited, but examples include tactile sensors and load cells. For example, a tactile sensor can be used when the sensor is arranged between adjacent battery cells, and a load cell can also be used when obtaining the load of the entire stack of battery cells.
The placement position of the load sensor 13 is not particularly limited as long as it can measure the load, and may be placed at one location or at multiple locations.

1.4. SOC Detector The SOC detector 14 is a device that detects the SOC (State of Charge, state of charge of the battery) of the battery, and is connected to the battery 11 . A known SOC detector can be used, and here, the SOC is obtained by calculating the ratio of the remaining charge capacity to the battery capacity when fully charged. Note that the SOC detector 14 does not need to be arranged independently and may be integrated with the charge/discharge controller 12 described above.

1.5. Battery Determiner The battery determiner 15 is a device that determines whether the battery 11 is a genuine product that should originally be provided or a non-genuine product such as a compatible product. The battery determiner 15 is equipped with a calculation device that performs the determination by performing calculations in the method shown below, is connected to at least the load sensor 13 and the SOC detector 14, and is connected to at least the load sensor 13 and the SOC detector 14, and is connected to the load sensor 13 and the SOC detector 14. It is configured so that information can be obtained. Therefore, the battery determiner 15 is constituted by an electronic computer, and includes, for example, a CPU, a storage means, a RAM, a receiving means, a transmitting means, and the like. A known electronic computer can be used. Note that the battery determiner 15 does not need to be arranged independently and may be integrated with the charge/discharge controller 12 described above.
The calculation method performed by the battery determiner 15 will be described below.

1.5a. Battery Determination Method FIG. 2 shows the flow of a battery determination method S10 according to one example. As can be seen from FIG. 2, the battery determination method S10 includes a process S11 of acquiring the current SOC, a process S12 of acquiring the existing load fluctuation Px, a process S13 of starting charging, a process S14 of acquiring the load fluctuation Py, and a process S14 of acquiring the current SOC. It includes a step S15 of comparing with Py, a step S16 of determining whether Px and Py are equivalent, a step S17 of determining that it is a genuine product, and a step S18 of determining that it is a non-genuine product.

[Current SOC acquisition process S11]
In the process S11 of acquiring the current SOC value (hereinafter sometimes referred to as "process S11"), the SOC at the present time (before the start of charging) is acquired. In this embodiment, the battery determiner 15 obtains the current SOC from the value obtained by the SOC detector 14 through the receiving means.
The current SOC is acquired at regular time intervals and updated with the latest information.

[Process S12 of acquiring existing load fluctuation Px]
In step S12 of acquiring the existing load fluctuation Px (hereinafter sometimes referred to as "process S12"), based on the SOC acquired in step S11, charging is performed at this SOC from a database prepared in advance. Obtain the relationship Px between the SOC of the genuine battery and the load of the battery cell at the time of starting.
In an all-solid-state battery, the members constituting the battery cell significantly expand and contract due to changes in SOC, and changes in SOC also change the load on the battery cell. FIG. 3 shows a graph of the relationship Px between the SOC (%) and the load value (N, Pa, etc.) of the battery cell according to one example.
Note that the relationship Px between the SOC and the load value differs depending on the SOC at the time of starting charging, so the relationship Px is obtained in advance for each SOC at the time of starting charging, and stored as a database in the storage means of the battery determination device 15, for example. Save it. Then, the SOC obtained in step S11 is used as the SOC for starting charging, and Px is obtained from the database, and this is set as Px of the genuine product.

In addition, when multiple load sensors 13 are provided, Px is obtained in advance for each position where the load sensor 13 is placed and stored in a database, and multiple Px are obtained from the database based on the position and starting SOC. You can.

[Charging start process S13]
Charging of the battery is started in a charging start process S13 (hereinafter sometimes referred to as "process S13"). The start of charging is as known.

[Process S14 of acquiring load fluctuation Py]
In step S14 of acquiring the load fluctuation Py (hereinafter sometimes referred to as "step S14"), the relationship Py between the SOC and the load value after charging is started in step S13 is obtained by actual measurement. In this embodiment, for example, the battery determiner 15 acquires the SOC from the SOC detector 14 and the load value from the load sensor 14 . By continuing this at regular intervals, a load value can be obtained for each SOC that increases as charging progresses, and Py as shown in FIG. 4 can be obtained. Here, as the charge start (step S13) SOC, the SOC obtained in step S11 immediately before starting charging in step S13 is used.

[Process S15 of comparing Px and Py]
In step S15 of comparing Px and Py (hereinafter sometimes referred to as "step S15"), Px obtained in step S12 and Py obtained in step S14 are compared. In the comparison, Py is not the result of repeated measurements, so there may be large variations, so it is preferable to take this variation into account when comparing. Specifically, a range of ±several percent may be considered as a tolerance.

[Step S16 of determining whether Px and Py are equivalent]
In step S16 (hereinafter sometimes referred to as "process S16") of determining whether Px and Py are equivalent, it is determined whether Px and Py are equivalent based on the comparison in step S15. . Although the criteria for determination are not particularly limited, the determination can be made as follows, for example.
When the load value is measured at one location on the battery 11 using one load sensor 13, the maximum load value after charging, the difference between the maximum load value and the load value before charging starts (immediately before charging), It is possible to determine whether Px and Py are within a predetermined range by comparing one or a combination of the change speed of the load value with respect to the SOC change in a predetermined range, or the like.
When a plurality of load sensors 13 are arranged to measure load values at a plurality of positions on the battery 11, the position and load value where the load value is the highest after charging, the position and load value where the load is the lowest, Compare the difference in load values between the position where the load value is the highest and the position where the load is the lowest after charging, and the load distribution (load gradient) within the battery, or any combination of these, It can be determined whether Px and Py are within a predetermined range. In addition, when the load is measured at a plurality of positions, the criteria for determining the load value when the load value is measured at one place at each position may also be used.

FIG. 5 illustrates Px, Py1 (Py according to one example), and Py2 (Py according to another example). According to this example, Py1 is equivalent to Px, and Py2 is not equivalent to Px.
In step S16, if Px and Py are equivalent, Yes is selected and the process proceeds to step S17 in which the product is determined to be genuine; if Px and Py are not equivalent, No is selected and the product is determined to be non-genuine. The process proceeds to step S18 of determining that.

[Step S17 of determining that the product is genuine]
In step S17 (hereinafter sometimes referred to as "process S17") of determining that the battery is a genuine product, when it is determined that Px and Py are equivalent in step S16, the current battery is a genuine product. It will be determined that this is the case and will notify that fact as necessary.

[Step S18 of determining that the product is non-genuine]
In step S18 of determining that the battery is non-genuine (hereinafter sometimes referred to as "process S18"), when it is determined in step S16 that Px and Py are not equivalent, the current battery is non-genuine. It is determined that the product is a defective product, and notification to that effect is made as necessary.

1.5b. Application of Battery Determination Method The above-described battery determination method S10 can be executed in the battery determination device 15 by being stored as a program in the storage device of the battery determination device 15. That is, the computer program may have steps corresponding to each process from process S11 to process S18 included in battery determination method S10. Then, this computer program is called up from the storage device as needed and calculated by the CPU, so that the battery determination device 15 can obtain the same result as in the battery determination method S10.

2. Effects, etc. According to the battery system 10, the battery determination method S10, and the corresponding computer program of the present disclosure, it is possible to determine whether the battery currently being used is a genuine product or a non-genuine product, and the accuracy is higher than that of the conventional battery. is higher than that of In other words, if the battery cell is a genuine product, the load fluctuation pattern of the battery cell during charging is determined by the SOC at the start of charging, so the relationship between the SOC of the battery cell actually being charged and the battery cell load value is used as a comparison standard. By comparing with the actual product, it is possible to accurately determine whether the product is genuine or not.

10 Battery System 11 Battery 12 Charge/Discharge Controller 13 Load Sensor 14 SOC Detector 15 Battery Determiner S10 Battery Determination Method S11 Process of Acquiring Current SOC S12 Process of Acquiring Existing Load Fluctuation Px S13 Process of Starting Charging S14 Load Process of obtaining fluctuation Py S15 Process of comparing Px and Py S16 Process of determining whether Px and Py are equivalent S17 Process of determining that it is a genuine product S18 Process of determining that it is a non-genuine product

Claims (1)

A battery system for determining whether a battery is genuine or non-genuine, the battery system comprising:
comprising an arithmetic device that determines whether the battery is regular or non-regular;
The arithmetic device is
Px, which is the relationship between the charging state of a genuine battery obtained in advance and the load value of the battery cell, is
In comparison with Py, which is the relationship between the charging state and the load value of the battery cell during actual charging of the battery cell,
If the Px and the Py are equivalent, the product is determined to be a genuine product, and if the Px and the Py are not equivalent, the product is determined to be a non-genuine product.
battery system.

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