JP5626040B2 - Battery management device and battery management system - Google Patents

Description

  The present invention relates to a battery management device and a battery management system that manage secondary batteries to be recycled.

  Some have a secondary battery mounted on the vehicle and the vehicle is driven using energy output from the secondary battery. Some secondary batteries removed from the vehicle have not reached the end of their service life, and can be reused.

JP 2007-141464 A JP 2010-111276 A JP 2005-238969 A JP 2009-063555 A JP 2007-057434 A

  If the usage environment of the secondary battery changes when the secondary battery is reused, the progress of deterioration of the secondary battery may change. For example, when predicting the deterioration state of the secondary battery in the future based on the deterioration state (actual value) of the secondary battery up to now, if the usage environment of the secondary battery changes, the deterioration of the secondary battery It may be difficult to estimate the state.

  The battery management apparatus according to the first invention of the present application includes a memory and a controller. The memory stores the identification information of the secondary battery in association with the environment information specifying the environment in which the secondary battery was used. In response to the input of the environment information specifying the environment on the side receiving the supply of the secondary battery, the controller selects the secondary battery having the same environment information among the plurality of secondary batteries stored in the memory. Search for.

  According to the first invention of the present application, the secondary battery can be reused in the same environment by using the search result of the secondary battery. If the secondary battery is continuously used under the same environment, for example, it becomes easy to estimate the deterioration state of the future secondary battery based on the deterioration state of the past secondary battery.

  Each environmental information can be determined based on a temperature distribution indicating the occurrence frequency for each temperature. That is, the environmental information is different if the temperature distribution is different. A plurality of temperature distributions can be divided into a plurality of sections, and environmental information can be set for each section.

  Information related to the search result of the secondary battery can be transmitted from the battery management device to the device on the side receiving the supply of the secondary battery. Thereby, it is possible to confirm whether or not there is a reusable secondary battery in the device that receives the supply of the secondary battery.

  The secondary battery can be mounted on a vehicle. This secondary battery outputs energy used for running the vehicle. As the secondary battery, an assembled battery in which a plurality of single cells are electrically connected in series can be used. Here, the single battery which comprises an assembled battery can also be used as a secondary battery.

  The battery management system according to the second invention of the present application includes the battery management device according to the first invention of the present application and a transmission device. The transmission device transmits the identification information of the secondary battery and the environment information specifying the environment in which the secondary battery was used to the battery management device. The memory of the battery management device can store information transmitted from the transmission device. According to the second invention of the present application, information on the secondary battery to be recycled can be collected and managed in the battery management device.

  The battery management system according to the third invention of the present application includes the battery management device according to the first invention of the present application and a transmission / reception device. The transmission / reception device transmits environment information specifying the environment on the side receiving the supply of the secondary battery to the battery management device, and receives a search result from the battery management device. According to the third invention of the present application, when a secondary battery to be recycled is used, it is possible to confirm whether or not the secondary battery exists by making an inquiry to the management apparatus from the transmission / reception apparatus. If the secondary battery is present, the secondary battery can be reused by supplying the secondary battery.

  A fourth invention of the present application is a battery management program executed by a computer, and includes a first step and a second step. In the first step, environmental information specifying the environment on the side receiving the secondary battery is acquired. In the second step, the environment information acquired in the first step using the memory that stores the identification information of the secondary battery and the environment information that specifies the environment in which the secondary battery was used, and the memory The secondary battery whose environmental information stored in is matched is searched. According to the fourth invention of the present application, the secondary battery can be reused in the same environment by using the search result of the secondary battery.

1 is a schematic diagram of a battery management system that is Embodiment 1. FIG. In Example 1, it is a flowchart explaining the process in a battery information input terminal. It is a figure which shows the information stored in the database of the battery management apparatus in Example 1. FIG. In Example 1, it is a flowchart explaining the process in a supply information input terminal. 3 is a flowchart illustrating a search process of a battery management device according to the first embodiment.

  Examples of the present invention will be described below.

  A battery management system that is Embodiment 1 of the present invention will be described. FIG. 1 is a schematic diagram illustrating a configuration of a battery management system. The battery management system 1 of this embodiment is used when recycling a battery pack mounted on a vehicle.

  The battery pack outputs energy used for running the vehicle. Specifically, the electrical energy output from the battery pack is converted into kinetic energy used for running the vehicle by a motor / generator. When the vehicle is decelerated or stopped, the motor / generator converts kinetic energy generated during braking of the vehicle into electric energy and supplies the electric energy to the battery pack. The battery pack can store electric energy supplied from the motor / generator.

  Vehicles equipped with battery packs include electric vehicles and hybrid vehicles. An electric vehicle is a vehicle that uses only a battery pack as a power source for running the vehicle. A hybrid vehicle is a vehicle that uses another power source such as an internal combustion engine or a fuel cell in addition to a battery pack as a power source of the vehicle.

  The battery pack includes an assembled battery configured by electrically connecting a plurality of unit cells in series, and a case for housing the assembled battery. As the single battery, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. The battery pack may include a plurality of assembled batteries electrically connected in parallel.

  In this embodiment, the assembled battery and the battery pack including the case are targeted for recycling, but the present invention is not limited to this. For example, only the assembled battery can be the target of recycling, or each single battery constituting the assembled battery can be the target of recycling. When the assembled battery is recycled, the assembled battery can be incorporated into a case to constitute a battery pack. When recycling the unit cells, a plurality of unit cells can be electrically connected in series to form an assembled battery. A battery pack can be constructed by incorporating this assembled battery into a case.

  The battery management system 1 includes a battery management device 10, a battery information input terminal (transmission device) 20, and a supply information input terminal (transmission / reception device) 30. The battery management apparatus 10 includes a CPU 11 as a controller and a database (DB) 12 as a memory. The battery information input terminal 20 and the supply information input terminal 30 are connected to the battery management apparatus 10 via the network 40. As the network 40, a dedicated network or the Internet can be used.

  The battery information input terminal 20 is used to input information about the battery pack to be recycled, and the input information is sent to the battery management apparatus 10 via the network 40. The database 12 of the battery management device 10 stores information transmitted from the battery information input terminal 20.

  The supply information input terminal 30 is used to input information related to the battery pack when the battery pack for recycling is supplied. Input information of the supply information input terminal 30 is sent to the battery management apparatus 10 via the network 40. The input information may be information that identifies the battery pack to be supplied. The CPU 11 of the battery management apparatus 10 receives the information transmitted from the supply information input terminal 30, searches for a battery pack corresponding to this information, and transmits the search result to the supply information input terminal 30.

  A process when inputting information on the battery pack using the battery information input terminal 20 will be described with reference to FIG.

  In step S101 of FIG. 2, the deterioration state of the battery pack is estimated. The battery pack is removed from the vehicle, and it can be determined whether or not the battery pack can be recycled by estimating the deterioration state. As a method for estimating the deterioration state, for example, the resistance value can be calculated from the current value and voltage value of the battery pack, and the deterioration state can be estimated based on the rate of change with respect to the resistance value in the initial state. The initial state is a state immediately after manufacturing the battery pack. As a method for estimating the deterioration state, a known method can be used as appropriate. The estimation result of the deterioration state is input to the battery information input terminal 20.

  In step S102, the history information of the vehicle on which the battery pack is mounted is input to the battery information input terminal 20. The history information includes the use environment of the vehicle, the travel distance of the vehicle, the use period of the vehicle (battery pack), and the travel state of the vehicle. The history information only needs to include at least the usage environment.

  The use environment is information on a region where the vehicle is mainly used, and can be classified into a plurality of sections in advance. Specifically, it is possible to divide Japan into a plurality of divisions and to divide regions around the world into a plurality of divisions. The plurality of categories can be classified mainly based on the temperature distribution in the area where the battery pack is used. The temperature distribution can be represented by, for example, the occurrence frequency of each temperature region. The occurrence frequency is a ratio of time when each temperature region is generated to the entire time. The temperature distribution varies depending on the altitude and climate of the area of use. The range of each temperature range can be set as appropriate.

  The usage period of the vehicle (battery pack) is a period from when the vehicle is first traveled to the present time, and includes not only a period during which the vehicle is traveling but also a period during which the vehicle is left unattended. The traveling state of the vehicle is a usage state (Ah / km) of the battery pack that accompanies the traveling of the vehicle, and indicates the charge / discharge amount of the battery pack with respect to the traveling distance of the vehicle.

  In step S103, the battery information input terminal 20 transmits the information obtained in steps S101 and S102 to the battery management device 10. The CPU 11 of the battery management apparatus 10 receives the information transmitted from the battery information input terminal 20 and stores the data shown in FIG.

  The data shown in FIG. 3 is data indicating battery pack identification information, battery pack deterioration information, vehicle history information, and a battery pack supplier. The battery management device 10 receives the information from the plurality of battery information input terminals 20 or receives the plurality of information from the specific battery information input terminals 20, and updates the data shown in FIG. The battery pack identification information is information for specifying the battery pack. When the battery pack differs depending on the vehicle type, the vehicle type can also be specified by the identification information of the battery pack.

  The deterioration information is information obtained in step S101 in FIG. 2 and indicates how much the battery pack has deteriorated. As the deterioration information, for example, the rate of change of the internal resistance of the battery pack can be used, or SOH (State Of Health) can be used. The change rate of the internal resistance is a change rate between the internal resistance as a reference value and the current internal resistance. As the reference value, the value of the internal resistance of the battery pack immediately after manufacture can be used. The supplier indicates the supplier of the battery pack to be recycled. In FIG. 3, the supplier is a dealer, but this is not a limitation.

  The data shown in FIG. 3 is an example, and items different from the items shown in FIG. 3 can be added, or some items shown in FIG. 3 can be replaced with other items. For example, items relating to the cost and delivery date of the battery pack can be added. The cost indicates the cost when purchasing a battery pack for recycling. The delivery date indicates a period until a battery pack for recycling is delivered. The information stored in the database 12 only needs to include at least battery pack identification information and usage environment.

  Next, processing when inputting information related to a battery pack desired to be supplied using the supply information input terminal 30 will be described with reference to FIG.

  In step S <b> 201 of FIG. 4, information regarding the battery pack is input to the supply information input terminal 30. The battery pack here is a battery pack to be supplied, in other words, a battery pack to be reused. The information on the battery pack includes, for example, battery pack identification information, information on a vehicle on which the battery pack is mounted, and the number of battery packs. The information related to the battery pack only needs to include at least information that can identify the battery pack.

  In step S202, information regarding a battery pack supply destination is input. The information regarding the supplier includes the usage environment of the supplier and the location of the supplier. The use environment is the same as the use environment described in FIG. 2 and FIG.

  In step S <b> 203, the supply information input terminal 30 transmits the information input in steps S <b> 201 and S <b> 202 to the battery management device 10. The battery management device 10 receives information from the supply information input terminal 30 and searches for a battery pack corresponding to this information.

  The battery pack search process in the battery management apparatus 10 will be described with reference to FIG. The processing shown in FIG. 5 is performed by the CPU 11 executing based on a program stored in the memory of the battery management device 10. This program can be stored in a recording medium. Moreover, a program can also be downloaded to the battery management apparatus 10 using a network.

  In step S <b> 301 of FIG. 5, the CPU 11 of the battery management apparatus 10 receives information transmitted from the supply information input terminal 30. In step S302, the CPU 11 searches for a battery pack corresponding to the received information.

  Information acquired from the battery information input terminal 20 (information shown in FIG. 3) is stored in the database 12. The CPU 11 uses the information stored in the database 12 to determine whether there is a battery pack that matches the information received from the supply information input terminal 30. Specifically, the CPU 11 compares the usage environment of the battery pack stored in the database 12 with the usage environment of the battery pack transmitted from the supply information input terminal 30, and determines whether or not the usage environments match. Is determined.

  If the usage environments of the battery packs match, the CPU 11 determines that there is a battery pack corresponding to the information from the supply information input terminal 30. Further, if the usage environment of the battery packs does not match, the CPU 11 determines that there is no battery pack corresponding to the information from the supply information input terminal 30.

  If battery packs having the same structure are used in all vehicles regardless of the vehicle type, it is only necessary to determine whether or not the usage environment of the battery packs is the same. On the other hand, when the structure of the battery pack differs depending on the vehicle type, the CPU 11 also determines whether or not the vehicle type on which the battery pack is mounted matches.

  When the search for the battery pack is completed, the CPU 11 transmits the search result to the supply information input terminal 30 in step S303. If the battery pack corresponding to the information from the supply information input terminal 30 does not exist, the CPU 11 transmits information indicating that the battery pack does not exist to the supply information input terminal 30.

  If there is a battery pack corresponding to the information from the supply information input terminal 30, the CPU 11 transmits information indicating that the battery pack exists to the supply information input terminal 30. When transmitting information indicating that the battery pack exists, the CPU 11 also transmits to the supply information input terminal 30 the data (deterioration information, history information, and supply destination) shown in FIG. 3 corresponding to the battery pack.

  The CPU 11 transmits not only information on whether or not a battery pack exists, but also information on the battery pack to the supply information input terminal 30 when the battery pack exists. Specifically, since various types of information corresponding to the battery pack are stored in the database 12 (see FIG. 3), these pieces of information are also transmitted to the supply information input terminal 30. As shown in FIG. 3, the transmission information includes deterioration information of the battery pack, history information of the vehicle in which the battery pack is mounted, and a supply destination of the battery pack. The operator of the supply information input terminal 30 can confirm information related to the battery pack to be supplied, and can determine whether or not the battery pack is supplied.

  Supply information input terminal 30 displays the information transmitted from CPU 11 on the display. The display may be configured integrally with the supply information input terminal 30 or may be connected to the supply information input terminal 30. The operator of the supply information input terminal 30 can confirm whether or not the battery pack is in stock by confirming display information on the display.

  According to the present embodiment, the battery pack is reused in the same use environment. When the usage environment of the battery pack changes, for example, the progress of deterioration of the battery pack may change. Therefore, as in the present embodiment, by continuing to use the battery pack in the same use environment, it is possible to suppress the deterioration progress of the battery pack from changing.

  Here, the deterioration state of the battery pack in the future may be estimated based on the deterioration state (measured value) of the battery pack up to now. In this case, when the use environment of the battery pack changes, the deterioration state before the change of the use environment is not easily used as a reference when estimating the deterioration state after the change of the use environment. That is, there is a possibility that the estimation accuracy of the deterioration state is lowered.

  The supply information input terminal 30 described in the present embodiment can be mounted on a vehicle. Thus, when the battery pack mounted on the vehicle is nearing the end of its life, it is possible to search for a reusable battery pack while the battery pack is still mounted on the vehicle. If the supply information input terminal 30 is mounted on the vehicle in advance, even if a part of the vehicle history information (for example, travel distance) is not input, detection of a sensor (for example, travel distance sensor) mounted on the vehicle. The result can be transmitted to the battery management device 10 as it is.

  In the present embodiment, the assembled battery mounted on the vehicle has been described, but the present invention is not limited to this. That is, the present invention can be applied to a secondary battery to be recycled.

10: Battery management device 11: CPU (controller)
12: Database (DB)
20: Battery information input terminal (transmission device)
30: Supply information input terminal (transmission / reception device)
40: Network

Claims (8)

A memory that associates and stores identification information of the secondary battery and environmental information that identifies the environment in which the secondary battery was used;
The secondary information in which the environmental information matches among the plurality of secondary batteries stored in the memory in response to input of environmental information specifying an environment on a side receiving the supply of the secondary battery. A controller that searches for batteries,
A battery management device comprising:   The battery management apparatus according to claim 1, wherein each piece of environmental information varies according to the occurrence frequency for each temperature.   3. The battery management apparatus according to claim 1, wherein the controller outputs information related to a search result of the secondary battery to a side receiving the supply of the secondary battery. 4.   The battery management device according to claim 1, wherein the secondary battery is mounted on a vehicle and outputs energy used for traveling of the vehicle.   5. The battery management apparatus according to claim 1, wherein the secondary battery is an assembled battery in which a plurality of single cells are electrically connected in series. The battery management device according to any one of claims 1 to 5,
A transmitter that transmits identification information of the secondary battery and environment information that identifies an environment in which the secondary battery was used, to the battery management device;
The battery management system, wherein the memory of the battery management device stores information transmitted from the transmission device. The battery management device according to any one of claims 1 to 5,
A transmission / reception device that transmits environment information for specifying an environment on the side receiving the supply of the secondary battery to the battery management device, and receives a search result from the battery management device;
A battery management system comprising: A battery management program executed by a computer,
A first step of acquiring environmental information for specifying an environment on the side receiving the supply of the secondary battery;
The environment information acquired in the first step using a memory that associates and stores identification information of the secondary battery and environment information that specifies an environment in which the secondary battery has been used, and the memory A second step of searching for the secondary battery that matches the environmental information stored in
A battery management program comprising:

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