Vehicle, computer program and recording medium

Abstract

The present invention provides a vehicle-mounted power source system and a vehicle in which a relatively high-power battery and a relatively high-capacity battery are connected in parallel and which enable stable battery output. Provided is a vehicle-mounted power storage system in which a power-type battery group and a capacity-type battery group are connected in parallel, wherein when the vehicle accelerates, a battery control device supplies power to a load preferentially from the power-type battery group, and when the speed of the vehicle is constant, the battery control device supplies power to the load from a capacity-type first battery group, and, in parallel, supplies power from a capacity-type second battery to the power-type battery group.

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle driving energy storage device in which an output-type battery set and at least two capacity-type first battery sets and capacity-type second battery sets, each having a higher capacity and lower output than the output-type battery set, are connected in parallel, a vehicle equipped with this vehicle driving energy storage device, a control method for this vehicle driving energy storage device, a computer program, a recording medium, etc. [Background technology]

[0002] Non-aqueous electrolyte secondary batteries (hereinafter simply referred to as "nonaqueous secondary batteries") are known as chargeable and dischargeable power storage devices mounted on vehicles. Lithium-ion secondary batteries, an example of such non-aqueous secondary batteries, are being developed for in-vehicle use because of their extremely high energy density. Batteries for in-vehicle use are required to have high levels of high output and high capacity in order to accommodate a variety of driving conditions.

[0003] For example, Patent Documents 1 to 3 disclose vehicles equipped with, as on-board power sources, a large-capacity power storage device (also referred to as a capacity-type battery set) that places a relatively high priority on capacity, and a large-output power storage device (also referred to as an output-type battery set) that places a relatively high priority on output. Of these, Patent Document 3 in particular proposes configuring the capacity-type battery set and the output-type battery set in parallel, and supplying power from the output-type battery set when large driving force is required, for example, during acceleration or climbing a slope. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-030308 [Patent Document 2] Japanese Patent Application Publication No. 2017-070078 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-155297 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the prior art including the above-mentioned patent documents does not yet satisfy market needs, and the following problems remain. That is, it is true that the on-board power storage systems disclosed in Patent Documents 1 to 3 can respond to a variety of driving conditions by supplying power from the output-type battery group when high output is required for a load such as an electric motor. However, the on-board power storage systems disclosed in Patent Documents 1 to 3 still have much room for improvement, for example, in driving environments where acceleration is frequently repeated, the capacity of the output-type battery group decreases and runs out first.

[0006] The present disclosure has been made in consideration of the above-mentioned problem as an example, and aims to provide a vehicle driving power storage device in which a relatively high-output battery and a relatively high-capacity battery are connected in parallel to provide stable battery output, a vehicle equipped with this vehicle driving power storage device, a control method for this vehicle power storage device, a computer program, and a recording medium on which the computer program is recorded. [Means for solving the problem]

[0007] In order to solve the above problem, according to one aspect of the present disclosure, there is provided a battery pack including a power-type battery set and at least two batteries each having a higher capacity and a lower output than the power-type battery set. It is a capacity type battery set, a vehicle driving power storage device in which a first set of capacity-type batteries and a second set of capacity-type batteries are connected in parallel; a switch mechanism capable of switching a connection state of the vehicle-driving electricity storage device; a control device that controls charging and discharging of the vehicle driving electric storage device via the switch mechanism; a load that is drive-controlled by the control device, the capacity-type second battery group is configured to have a capacity at least smaller than that of the capacity-type first battery group, and is configured to supply power exclusively to the output-type battery group without supplying power to the load, The control device (a) when the vehicle accelerates, the output-type battery group is given priority in supplying power to the load; (b) A vehicle is provided in which, when the speed of the vehicle is constant, power is supplied from the first capacity-type battery group to the load, and in parallel, power is supplied from the second capacity-type battery group solely to the output-type battery group without supplying power to the load.

[0008] In order to solve the above-described problems, according to yet another aspect of the present disclosure, there is provided a vehicle equipped with a vehicle-driving electricity storage device according to the present disclosure. In order to solve the above problem, according to yet another aspect of the present disclosure, there is provided a battery pack including a power-type battery pack mounted on a vehicle, and at least two batteries each having a higher capacity and a lower output than the power-type battery pack. It is a capacity type battery set, A first set of capacity-type batteries and a second set of capacity-type batteries are connected in parallel, and the second set of capacity-type batteries is configured to have a smaller capacity than the first set of capacity-type batteries. Installed in a vehicle A computer program applied to a vehicle drive power storage device configured to supply power solely to the output-type battery group without supplying power to a load, and a recording medium on which the program is recorded, wherein one or more processors acquire at least one of the speed and acceleration of the vehicle, and when the vehicle accelerates, The aforementioned A computer program and a recording medium having the program recorded thereon are provided that execute processes including: preferentially supplying power to a load from the output-type battery group; and, when the vehicle speed is constant, supplying power from the capacity-type first battery group to the load while simultaneously supplying power from the capacity-type second battery group exclusively to the output-type battery group without supplying power to the load. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide stable battery output even in a driving environment where acceleration is frequently repeated, for example. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating an example of the configuration of a vehicle equipped with a vehicle-driving electricity storage device according to the present disclosure. [Figure 2] 1 is a schematic diagram illustrating a configuration example of a vehicle driving electricity storage device according to an embodiment of the present disclosure. [Figure 3] 4 is a schematic diagram showing a first connection pattern of the vehicle driving power storage device to a load. FIG. [Figure 4] FIG. 10 is a schematic diagram showing a second connection pattern of the vehicle driving power storage device to a load. [Figure 5] FIG. 10 is a schematic diagram showing a third connection pattern of the vehicle driving electricity storage device to a load. [Figure 6] 1 is a functional block diagram of a vehicle including a control device according to an embodiment of the present disclosure. [Figure 7] 4 is a flowchart illustrating a method for controlling a vehicle driving power storage device executed by a control device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functions are designated by the same reference numerals, and redundant description will be omitted. Furthermore, for configurations other than those described in detail below, publicly known technologies, including those described in the patent documents listed above, and vehicle configurations may be appropriately applied.

[0012] <1-1. Vehicle drive power storage devices> 1 to 5, a configuration example of an in-vehicle power storage system 100 including a vehicle drive power storage device 30 according to an embodiment of the present disclosure and a vehicle 200 will be described. FIG. 1 is a schematic diagram showing a vehicle 200 equipped with an in-vehicle power storage system 100. Note that, hereinafter, an electric vehicle (BEV) equipped with an electric motor will be illustrated as an example of a "vehicle," but the vehicle of this embodiment may be a hybrid electric vehicle (HEV) that also uses a known engine (internal combustion engine) in combination, or may be an electric vehicle equipped with another known power generation device such as a gas turbine.

[0013] As shown in Fig. 1, a vehicle 200 of this embodiment is equipped with a load 60 that supplies driving force to wheels 1, which are drive wheels, via a known power transmission mechanism 2 including a differential gear. In the following, a front-wheel drive (FWD) vehicle in which driving force is supplied from the load 60 to the front wheels of the wheels 1 is illustrated as an example, but this embodiment is not limited to this form and may also be a rear-wheel drive (RWD) vehicle in which the driving force is supplied to the rear wheels, or an all-wheel drive (AWD) vehicle in which driving force is supplied to all wheels. Furthermore, the vehicle 200 of the present disclosure may also be, in addition to the above, an in-wheel motor type electric vehicle in which an electric motor is mounted individually for each wheel 1, for example.

[0014] The load 60 can be driven and controlled by, for example, a vehicle drive control device 70. The load 60 includes a known inverter 61 that receives power from the vehicle drive electricity storage device 30, and a known electric motor 62, such as an electric motor, that is connected to the inverter 61 and supplies driving force to the wheels 1. As shown in the figure, the load 60 of this embodiment is electrically connected to the vehicle drive electricity storage device 30, which serves as an on-board power source, via a switch mechanism 40 that can switch connection patterns.

[0015] As shown in Figure 2, the vehicle driving energy storage device 30 is composed of an output-type battery set 10 that has a higher output and a lower capacity than one of the battery sets, and at least two capacity-type battery sets 20 that are connected in parallel to the output-type battery set 10 and have a higher capacity and lower output than the output-type battery set 10. In the following, two sets of non-aqueous secondary batteries (lithium ion secondary batteries) with different characteristics are exemplified as the battery set of this embodiment, but as long as the mutual characteristics (high output and high capacity) defined in this embodiment can be established, other known secondary batteries other than non-aqueous secondary batteries may be included, such as one set of lithium ion secondary batteries and the other set of nickel-metal hydride batteries.

[0016] As an example, the output-type battery assembly 10 may be composed of one or more lithium-ion secondary batteries connected in series. Although a single battery is depicted in the figure, the output-type battery assembly 10 may be configured with multiple unit cells connected in series to obtain the voltage value required to drive the vehicle. An example of a lithium-ion secondary battery suitable for such an output-type battery assembly 10 is a known high-output lithium-ion secondary battery that uses lithium titanate for the negative electrode. As a non-limiting example, the one or more lithium-ion secondary batteries that make up the output-type battery assembly 10 of this embodiment use lithium manganese oxide as the positive electrode material and lithium titanate as the negative electrode material.

[0017] On the other hand, as can be seen from FIG. 2 and other figures, the capacity-type battery group 20 includes a first capacity-type battery group 20A and a second capacity-type battery group 20B, which are connected in parallel with the output-type battery group 10 and have a higher capacity and lower output than the output-type battery group 10. While a single battery is depicted in each of the figures, the capacity-type battery group 20 may each have multiple batteries connected in series to obtain the voltage required to drive the vehicle. Examples of lithium-ion secondary batteries suitable for such capacity-type battery group 20 include known lithium-ion secondary batteries with a carbon-based material used for the negative electrode and known high-capacity lithium-ion secondary batteries with a ternary positive electrode material (nickel-cobalt-lithium manganese oxide) used for the positive electrode. As a non-limiting example, one or more lithium-ion secondary batteries constituting the capacity-type battery group 20 of this embodiment may use lithium iron phosphate as the positive electrode material, a ternary positive electrode (nickel-cobalt-lithium manganese oxide), and a known carbon-based material as the negative electrode material.

[0018] 2, the parallel-connected first capacity-type battery group 20A and second capacity-type battery group 20B are also connected in parallel with the output-type battery group 10 so that their electrical capacities differ. In this embodiment, the capacity of the first capacity-type battery group 20A is configured to be at least larger (larger) than the capacity of the second capacity-type battery group 20B.

[0019] As will be described later, in the vehicle driving power storage device 30 of this embodiment, the above-mentioned capacity-type second battery group 20B is configured to supply power exclusively to the output-type battery group 10 without supplying power to the load 60. In other words, the capacity-type second battery group 20B of this embodiment may be configured to function as a battery dedicated to charging the output-type battery group 10.

[0020] Furthermore, the terminal voltages of the output-type battery group 10 and the capacity-type battery group 20 (the first capacity-type battery group 20A and the second capacity-type battery group 20B) constituting the vehicle driving power storage device 30 of this embodiment may be adjusted so that the upper limit voltages of each are approximately equal. In other words, in the output-type battery group 10 and the capacity-type battery group 20, the number of cells connected in series is adjusted so that the terminal voltages of each are equal. As an example, in the vehicle driving power storage device 30 of this embodiment, the output-type battery group 10 and the capacity-type battery group 20 may each have a different number of lithium-ion secondary batteries connected in series so that the upper limit voltage is 300V.

[0021] <1-2. Switch mechanism> The switch mechanism 40 is configured to have the function of switching the connection state of the above-described vehicle-driving electricity storage device 30. There are no particular limitations on the specific example of the switch mechanism 40, and any known switch such as a semiconductor switch or a mechanical switch may be applied as long as it performs the above-described function.

[0022] 2, the switch mechanism 40 of this embodiment is configured to have a first function of electrically connecting at least one of the output-type battery group 10 and the capacity-type battery group 20 to the load 60. In addition, the switch mechanism 40 of this embodiment is configured to have a second function of electrically connecting the second capacity-type battery group 20B to the output-type battery group 10.

[0023] Hereinafter, with reference to FIGS. 3 to 5, a connection pattern of the vehicle driving electricity storage device 30 using the switch mechanism 40 of this embodiment will be described. In the vehicle driving electricity storage device 30 of this embodiment, the output type battery set 10 and the capacity type battery set 20 are connected to a known electric circuit EC which is connected to a load 60 via this switch mechanism 40.

[0024] <1-3. First connection pattern> 3 shows a first connection pattern of the vehicle-driving electricity storage device 30 by the switch mechanism 40. As is clear from the figure, in the first connection pattern, the output-type battery group 10 is primarily connected to the load 60 of the vehicle 200. In this case, the switch mechanism 40 may also connect the capacity-type first battery group 20A to the load 60 as an auxiliary connection.

[0025] In other words, in the first connection pattern, the switch mechanism 40 can realize a configuration in which the output-type battery group 10 is connected alone to the load 60, a configuration in which the capacity-type first battery group 20A is connected alone to the load 60, and a configuration in which the output-type battery group 10 and the capacity-type first battery group 20A are connected in parallel to the load 60. Examples of driving environments in which such a first connection pattern is suitable include when the vehicle 200 is traveling while accelerating or decelerating significantly, or when the vehicle is traveling at a relatively high speed on a highway.

[0026] The criteria for determining whether to switch between the output-type battery group 10 and the first capacity-type battery group 20A relative to the load 60 in the first connection pattern may be set as appropriate depending on the torque and fuel economy required for the vehicle 200. One example of such a switching criteria is to set the rated output value of the first capacity-type battery group 20A as a determination threshold for switching, and connect the output-type battery group 10 to the load 60 when the required battery output exceeds this determination threshold, while connecting the first capacity-type battery group 20A to the load 60 when the required battery output is below this determination threshold. Even when connecting the output-type battery group 10 to the load 60 using such a determination threshold, the first capacity-type battery group 20A may be used as an auxiliary battery to connect it in parallel to the load 60.

[0027] <1-4. Second connection pattern> 4 shows a second connection pattern of the vehicle-driving electricity storage device 30 by the switch mechanism 40. As is clear from the figure, in the second connection pattern, the first capacity-type battery group 20A is connected to the load 60 of the vehicle 200 via an electric circuit EC. At this time, in parallel with the above, the switch mechanism 40 may also execute control to connect the second capacity-type battery group 20B to the output-type battery group 10 via a charging circuit CC and charge the output-type battery group 10.

[0028] In other words, in the second connection pattern, the switch mechanism 40 can realize a configuration in which the capacity-type first battery group 20A is connected alone to the load 60 to supply the necessary power to the load 60, and the capacity-type second battery group 20B is connected to the output-type battery group 10 to charge the output-type battery group 10. An example of a driving environment in which such a second connection pattern is suitable is when the vehicle 200 is traveling at a substantially constant speed (constant speed) without requiring large acceleration or deceleration, such as when traveling at a constant speed on a highway.

[0029] <1-5. Third connection pattern> 5 shows a third connection pattern of the vehicle-driving electricity storage device 30 using the switch mechanism 40. As is clear from the figure, in the third connection pattern, the vehicle-driving electricity storage device 30 is electrically disconnected from the load 60 of the vehicle 200, and the output-type battery group 10 and the capacity-type battery group 20 are electrically connected.

[0030] In other words, in the third connection pattern, the switch mechanism 40 can achieve a configuration in which the output-type battery group 10, the first capacity-type battery group 20A, and the second capacity-type battery group 20B are connected in parallel to balance the voltages of the batteries so that they are equal to each other. When the vehicle driving power storage device 30 goes through this third connection pattern, the occurrence of a battery with an extremely low voltage (i.e., a state in which the SOC is low) is suppressed, and it becomes possible to maintain, for example, the output-type battery group 10 in a state in which it can be used immediately. An example of a driving environment in which the third connection pattern is suitable is when the vehicle 200 is stopped, and the supply of power from the vehicle driving power storage device 30 to the load 60 is not required.

[0031] For example, if the vehicle 200 continues to run at less than the rated battery output after slight acceleration for a long period of time, a favorable running condition may arise in which the capacity of the output-type battery group 10 can be conserved. On the other hand, since the amount of power consumed during acceleration of the vehicle 200 is relatively large, it can be assumed that there are many cases in which the charging rate of the output-type battery group 10 is lower than the charging rate of the first capacity-type battery group 20A. In contrast, in the in-vehicle power storage system 100 of this embodiment, the third connection pattern makes it possible to equalize the voltage of the entire vehicle-driving power storage device 30, thereby achieving stable battery output even in driving patterns that involve frequent acceleration or long periods of ups and downs.

[0032] <2-1. Detailed configuration of the battery control device> 1, the in-vehicle power storage system 100 in this embodiment is configured to include the above-described vehicle drive power storage device 30, switch mechanism 40, and battery control device 50 (also collectively referred to as "control device" together with a vehicle drive control device 70 described later) that controls the switch mechanism 40. The battery control device 50 may be configured to have a function of monitoring the state of charge (SOC) of the above-described vehicle drive power storage device 30, a function of controlling charging and discharging of the above-described vehicle drive power storage device 30, and the like.

[0033] Such a battery control device 50 is also called a BMU (Battery Management Unit) and is configured with one or more processors, such as a CPU (Central Processing Unit), and one or more memories, such as a RAM (Random Access Memory) or a ROM (Read Only Memory), connected to the processor so as to be able to communicate with the processor.

[0034] In this way, the battery control device 50 functions as a device that controls the charging and discharging of the output-type battery group 10 and the capacity-type battery group 20 via the switch mechanism 40 by having one or more processors execute a computer program. The computer program is a computer program that causes the processor to execute the operations to be performed by the battery control device 50, which will be described later. The computer program executed by the processor may be recorded on a recording medium that functions as a storage unit (memory) provided in the battery control device 50, or may be recorded on a recording medium built into the battery control device 50 or any recording medium that can be externally attached to the battery control device 50.

[0035] The recording medium for recording a computer program may be a magnetic medium such as a hard disk, a floppy disk, or a magnetic tape; an optical recording medium such as a CD-ROM (Compact Disk Read Only Memory), a DVD (Digital Versatile Disk), or a Blu-ray (registered trademark); a magneto-optical medium such as a floptical disk; a memory element such as a RAM or a ROM; a flash memory such as a USB (Universal Serial Bus) memory; an SSD (Solid State Drive); or any other medium capable of storing a program.

[0036] More specifically, the battery control device 50 in this embodiment includes a processing unit 50A and a storage unit 50B. The processing unit 50A is configured by one or more processors such as the CPUs described above, and includes a battery state value acquisition unit 51, an SOC monitoring unit 52, a switch control unit 53, and a display control unit 54, as illustrated in Fig. 6. Each unit included in the processing unit 50A is a function realized by the execution of a program by the processor described above. However, some of the battery state value acquisition unit 51, the SOC monitoring unit 52, the switch control unit 53, and the display control unit 54 may be configured by known analog circuits.

[0037] The processing unit 50A may be configured to be able to communicate with a vehicle drive control device 70 configured with another known ECU mounted on the vehicle. The vehicle drive control device 70 may have a function to control the drive of the battery control device 50 of this embodiment based on detection values ​​of known vehicle state sensors including, for example, a vehicle speed sensor 72d, and further an acceleration sensor, an angular velocity sensor, a steering angle sensor, an accelerator pedal sensor, and a brake pedal sensor, each of which is not shown. The processing unit 50A may be configured to be able to communicate information with a known external network NET, such as the Internet, via a known on-board communication device 71.

[0038] The storage unit 50B may be configured to include a known memory MR such as RAM that temporarily stores information, and a known recording device RD such as a hard disk HDD or SSD that can store programs, etc. The storage unit 50B of this embodiment may store programs executed by the processing unit 50A, various parameters used in executing the programs, acquired data, data of calculation results, etc.

[0039] The battery state value acquiring unit 51, the SOC monitoring unit 52, the switch control unit 53, and the display control unit 54 in the processing unit 50A will be described below.

[0040] <2-2. Battery status value acquisition section> The battery state value acquisition unit 51 can execute processing to acquire state values ​​(specifically, information related to current values ​​and voltage values) of the vehicle driving power storage device 30 mounted on the vehicle 200. Specifically, the battery state value acquisition unit 51 has a function to detect state values ​​(voltage values ​​and current values) of the vehicle driving power storage device 30 in the vehicle 200 while the vehicle is running or stopped, via a known current sensor 72a and a known voltage sensor 72b provided in the vehicle driving power storage device 30.

[0041] <2-3.SOC monitoring department> The SOC monitoring unit 52 executes a process of detecting and monitoring the SOC (charging rate) of each of the vehicle-driving power storage devices 30 (the output-type battery group 10 and the capacity-type battery group 20) mounted on the vehicle 200 via an on-board current sensor 72a and voltage sensor 72b. The specific method of detecting the SOC by the SOC monitoring unit 52 is not particularly limited as long as it does not deviate from the spirit of this embodiment, and various known SOC estimation techniques such as those disclosed in JP 2021-68637 A and WO 2019 / 193471 A may be applied.

[0042] <2-4. Switch control section> The switch control unit 53 executes a process of switching the above-mentioned connection pattern of the vehicle-driving power storage device 30 to the above-mentioned load 60. For example, the switch control unit 53 may execute a process of switching between the first connection pattern exemplified in Fig. 3, the second connection pattern exemplified in Fig. 4, and the third connection pattern exemplified in Fig. 5 via the above-mentioned switch mechanism 40.

[0043] More specifically, in this embodiment, when the vehicle 200 accelerates, the switch control unit 53 can apply the first connection pattern to the load 60 to preferentially supply power from the output-type battery group 10. Furthermore, when the vehicle 200 decelerates, the switch control unit 53 can apply the first connection pattern to the load 60 to electrically connect the output-type battery group 10 and the load 60. Note that the switch control unit 53 may determine whether the vehicle 200 is accelerating by, for example, a known calculation method based on the vehicle speed value acquired from the above-described vehicle speed sensor 72d, or may determine based on the vehicle acceleration value acquired from the above-described acceleration sensor.

[0044] In addition, when the speed of the vehicle 200 is constant, the switch control unit 53 applies the second connection pattern described above, and can supply power from the capacity-type second battery group 20B to the output-type battery group 10 in parallel with supplying power from the capacity-type first battery group 20A to the load 60.

[0045] Furthermore, when the vehicle 200 is stopped, the switch control unit 53 can apply the third connection pattern described above and perform balance control of the voltages of the output-type battery group 10, the first capacity-type battery group 20A, and the second capacity-type battery group 20B. At this time, the switch control unit 53 can perform control to supply power to the output-type battery group 10 to charge the output-type battery group 10 without supplying power from the second capacity-type battery group 20B to the load 60.

[0046] Furthermore, the switch control unit 53 may perform control to supply power from the output-type battery group 10 to the load 60 without supplying power from the first capacity-type battery group 20A to the load 60, based on the battery temperatures detected from the first capacity-type battery group 20A and the second capacity-type battery group 20B. More specifically, when power is supplied from the first capacity-type battery group 20A to the load 60 based on the second connection pattern described above, if constant speed driving continues for a long period of time, for example, during high-speed driving, it is expected that the battery temperature of the capacity-type battery group 20 will become high.

[0047] In such a case, the switch control unit 53 switches from the second connection pattern to the first connection pattern, and temporarily supplies power to the load 60 from the output-type battery group 10 without supplying power from the capacity-type first battery group 20A, thereby suppressing deterioration of the capacity-type battery group 20. The battery temperatures in the output-type battery group 10 and the capacity-type battery group 20 can be detected based on a known battery temperature sensor 72e mounted on each battery group (see FIG. 2).

[0048] <2-5. Display control section> The display control unit 54 executes a process of displaying various information such as the connection state of the vehicle-driving electricity storage device 30 to the load 60 on the display device 73. Here, the display device 73 of the present embodiment may be, for example, a known in-vehicle display. The display control unit 54 may display the above-mentioned various information by voice on an in-vehicle speaker, or may display the information on an external terminal such as a smartphone carried by the occupant.

[0049] <2-6. Computer programs and recording media> The computer program that realizes each function of the processing unit 50A is a computer program applied to a vehicle drive power storage device in which an output-type battery group mounted on a vehicle and at least two capacity-type first and second batteries with higher capacity and lower output than the output-type battery group are connected in parallel, and causes one or more processors to execute processes including acquiring at least one of the speed and acceleration of the vehicle, supplying power preferentially from the output-type battery group to a load when the vehicle accelerates, and supplying power from the capacity-type second battery group to the output-type battery group in parallel with supplying power from the capacity-type first battery group to the load when the vehicle speed is constant. Furthermore, such a computer program may be stored in a known recording medium as described above, or may be downloaded to the vehicle 200 from a known server such as a cloud server.

[0050] <3-1. Other in-vehicle equipment> The vehicle 200 of this embodiment may further include a vehicle drive control device 70 that cooperates with the battery control device 50 described above to control the load 60, the generator described above, and the like. Such a vehicle drive control device 70 is configured to have a function of controlling the drive of the vehicle 200 based on, for example, state information of the vehicle 200 detected by sensors 72 mounted on the vehicle 200. The vehicle drive control device 70 is configured to include, for example, one or more processors such as a CPU (Central Processing Unit) and one or more memories such as a RAM (Random Access Memory) or a ROM (Read Only Memory) connected to the processor so as to be able to communicate with the processor.

[0051] Such vehicle state sensors are devices that measure information indicating the behavior and operating state of the vehicle 200. As an example, the vehicle state sensors belong to the sensors 72 of this embodiment and may include, for example, a vehicle speed sensor 72d, a known acceleration sensor, an known angular velocity sensor, etc. The vehicle state sensors may also include a known steering angle sensor, an accelerator pedal sensor, and an known brake pedal sensor.

[0052] The vehicle drive control device 70 may also be configured to have a function of controlling the drive of the vehicle 200 based on position information detected by a vehicle position information sensor 72c mounted on the vehicle 200. Such vehicle position information sensor 72c may be, for example, a well-known GPS (Global Positioning System) sensor. Note that, although a GPS sensor is used as the vehicle position information sensor 72c in this embodiment, the present invention is not limited to this example, and the vehicle position information sensor 72c may also be equipment that receives satellite signals from other satellite systems that identify the position of the vehicle 200.

[0053] <4-1. Control method for in-vehicle energy storage system> Next, a control method for the in-vehicle power storage system 100 including the vehicle drive power storage device 30 of this embodiment will be specifically described with reference to Fig. 7. The control method may be used as the algorithm of the above-mentioned program. A program having such an algorithm may be distributed, for example, in a downloadable manner via a known network, or in a form stored on a recording medium. The following description will be given assuming that, for example, a user gets into vehicle 200, turns on the system power supply, and starts driving.

[0054] First, in step 1, the control device (battery control device 50 or vehicle drive control device 70) determines whether the traveling vehicle 200 is accelerating or decelerating via the above-mentioned vehicle speed sensor 72d, acceleration sensor, etc. If it is determined in step 1 that the traveling vehicle 200 is neither accelerating nor decelerating, the process proceeds to step 2, which will be described later.

[0055] On the other hand, if it is determined in step 1 that the traveling vehicle 200 is accelerating or decelerating, the process proceeds to step 4A, where the control device applies the first connection pattern (pattern I in the figure) via the switch mechanism 40 to electrically connect the load 60 and the vehicle driving power storage device 30. As a result, power is supplied to the load 60 preferentially from the output-type battery group 10 of the vehicle driving power storage device 30. At this time, power may be supplied to the load 60 by supplementarily using the first capacity-type battery group 20A.

[0056] If it is determined in step 1 that the traveling vehicle 200 is neither accelerating nor decelerating, then in step 2, the above-described control device determines whether the speed of the traveling vehicle 200 is constant via the vehicle speed sensor 72d, the acceleration sensor, etc. If it is determined in step 2 that the speed of the traveling vehicle 200 is not constant, the process proceeds to step 3, which will be described later. Note that the criterion for determining whether the vehicle speed is constant in step 2 does not necessarily have to be a single speed value; for example, the range of the vehicle speed measured within a predetermined determination time is within ±5 km / h of the average value within that time.

[0057] On the other hand, if it is determined in step 2 that the speed of the traveling vehicle 200 is constant, the process proceeds to step 4B, where the control device applies the second connection pattern (pattern II in the figure) via the switch mechanism 40 to electrically connect the load 60 and the vehicle driving power storage device 30. As a result, power is supplied from the capacity-type first battery group 20A of the vehicle driving power storage device 30 to the load 60, and power is supplied (charged) from the capacity-type second battery group 20B to the output-type battery group 10.

[0058] If it is determined in step 2 that the speed of the traveling vehicle 200 is not constant, the above-described control device determines whether the vehicle 200 is stopped via the vehicle speed sensor 72d, the acceleration sensor, etc. in the following step 3. If it is determined in step 3 that the vehicle 200 is not stopped, the process proceeds to step 5, which will be described later.

[0059] On the other hand, if it is determined in step 3 that the vehicle 200 is stopped, the process proceeds to step 4C, where the control device applies the third connection pattern (pattern III in the figure) via the switch mechanism 40 to electrically disconnect the vehicle-driving power storage device 30 from the load 60 and executes voltage balance control within the vehicle-driving power storage device 30. This causes the voltage values ​​and charging rates SOC of the output-type battery group 10, the first capacity-type battery group 20A, and the second capacity-type battery group 20B to become approximately equal, making it possible to apply connection patterns via the switch mechanism 40 that are suitable for various subsequent driving environments.

[0060] After the above steps 4A, 4B, and 4C are performed, it is determined whether or not the system of the vehicle 200 is turned off in the following step 5. If the system of the vehicle 200 is turned off in step 5, the control method of this embodiment is completed, and if the system of the vehicle 200 is not turned off, the process returns to step 1 and the above processing is repeated.

[0061] As described above, a vehicle 200 equipped with an in-vehicle power storage system 100 according to an embodiment of the present disclosure is equipped with a vehicle drive power storage device in which an output-type battery group and at least two capacity-type first and second batteries, each with a higher capacity and lower output than the output-type battery group, are connected in parallel. A control device that controls this vehicle drive power storage device can prioritize power supply from the output-type battery group to the load when the vehicle accelerates under predetermined conditions (rapid charging and discharging), for example, and can supply power from the capacity-type second battery group to the output-type battery group in parallel with power supply from the capacity-type first battery group to the load when the vehicle speed is constant. This enables stable battery output, for example, even in driving environments where acceleration is frequently repeated.

[0062] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, the technology of the present disclosure is not limited to such examples. It is clear that a person skilled in the art of the technology to which the present disclosure pertains can conceive of various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

[0063] For example, in the embodiment of the present disclosure, a non-aqueous electrolyte secondary battery (e.g., a lithium ion secondary battery) is exemplified as an output-type or capacity-type battery set that drives the load 60 mounted on the vehicle, but other known secondary batteries other than non-aqueous electrolyte secondary batteries, such as a nickel-metal hydride battery or a lead-acid battery, may also be applied as the battery set of the present disclosure. [Explanation of symbols]

[0064] 1: Wheel, 2: Power transmission mechanism, 10: Output type battery set, 20: Capacitive type battery set, 20A: Capacitive type first battery set, 20B: Capacitive type second battery set, 30: Vehicle driving power storage device, 40: Switch mechanism, 50: Battery control device, 60: Load, 70: Vehicle control device, 71: Communication device, 72: Sensors, 73: Display device, 100: In-vehicle power storage system, 200: Vehicle

Claims

1. a vehicle driving power storage device in which a power output type battery set and at least two capacity type battery sets, a first capacity type battery set and a second capacity type battery set, which are higher in capacity and lower in output than the power output type battery set, are connected in parallel; a switch mechanism capable of switching a connection state of the vehicle-driving electricity storage device; a control device that controls charging and discharging of the vehicle driving electric storage device via the switch mechanism; a load that is drive-controlled by the control device, the second capacity-type battery group is configured to have a capacity at least smaller than that of the first capacity-type battery group, and is configured to supply power exclusively to the output-type battery group without supplying power to the load, The control device (a) when the vehicle accelerates, the output-type battery group is given priority in supplying power to the load; (b) when the speed of the vehicle is constant, supplying power from the first capacity-type battery group to the load while supplying power from the second capacity-type battery group exclusively to the output-type battery group without supplying power to the load; vehicle.

2. The control device (c) when the vehicle is stopped, balancing the voltages of the output-type battery group, the first capacity-type battery group, and the second capacity-type battery group; The vehicle of claim 1 .

3. When performing (b), the control device: and based on battery temperatures detected from the first capacity-type battery group and the second capacity-type battery group, control is performed to supply power to the load from the output-type battery group without supplying power from the first capacity-type battery group to the load.

3. A vehicle according to claim 1 or 2.

4. A computer program applied to a vehicle driving power storage device, in which an output-type battery set mounted on a vehicle is connected in parallel with at least two capacity-type battery sets, a first capacity-type battery set and a second capacity-type battery set, each having a higher capacity and a lower output than the output-type battery set, and the second capacity-type battery set is configured to have a smaller capacity than the first capacity-type battery set and is configured to supply power exclusively to the output-type battery set without supplying power to a load mounted on the vehicle, one or more processors, At least one of the speed and acceleration of the vehicle is acquired; When the vehicle accelerates, the power supply to the load is prioritized from the output-type battery set; and When the speed of the vehicle is constant, power is supplied from the first capacity-type battery group to the load, and in parallel, power is supplied from the second capacity-type battery group only to the output-type battery group without supplying power to the load; A computer program that causes a process including the steps of:

5. A recording medium having recorded thereon a computer program applicable to a vehicle driving power storage device, the device comprising: an output-type battery set mounted on a vehicle; and at least two capacity-type battery sets, a first capacity-type battery set and a second capacity-type battery set, each having a higher capacity and a lower output than the output-type battery set, connected in parallel; the second capacity-type battery set having a smaller capacity than the first capacity-type battery set; and the second capacity-type battery set being configured to supply power exclusively to the output-type battery set without supplying power to a load mounted on the vehicle, one or more processors, At least one of the speed and acceleration of the vehicle is acquired; When the vehicle accelerates, the power supply to the load is prioritized from the output-type battery set; and When the speed of the vehicle is constant, power is supplied from the first capacity-type battery group to the load, and in parallel, power is supplied from the second capacity-type battery group only to the output-type battery group without supplying power to the load; A recording medium on which a computer program for executing a process including the steps of:

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