Battery pressurizing mechanism control method and control device as well as vehicle

Abstract

To provide a battery pressurizing mechanism control method and a control device that can apply an appropriate pressure to a battery without increasing the size of the pressurizing mechanism even when the output required from the vehicle side is large.SOLUTION: A pressurizing mechanism 30 includes a pair of pressure plates 31, 32 disposed opposite a battery module 10 in an expansion / contraction direction M, a resilient pressure member 50 interposed between the pair of pressure plates 31, 32 to apply pressure to the battery module 10, a linear motion mechanism 40 capable of expanding and contracting the opposing distance between the pair of pressure plates 31, 32, and a drive mechanism 60 that drives the linear motion mechanism 40. A control device 80 includes a measurement unit 81 that measures the opposing distance between the pair of pressure plates 31, 32, and a control unit 82 that controls the drive mechanism 60, and the control unit 82 controls the drive mechanism 60 on the basis of the relationship between information on the opposing distance and information on a deflection margin of the deflection amount of the resilient pressure member 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a control technology for a battery pressurizing mechanism that actively pressurizes a lithium precipitation type all-solid-state battery.

Background Art

[0002] In this type of all-solid-state battery, the thickness of the battery cell changes according to charge and discharge. Therefore, in order to exhibit stable battery performance, a battery pressurizing mechanism for actively pressurizing the all-solid-state battery is required. Here, Patent Document 1 describes a basic structure for applying an appropriate pressure to a battery cell by adjusting a battery pressurizing mechanism according to the state of the battery cell, and miniaturization of a mechanism for realizing high energy density.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when this type of all-solid-state battery is mounted on a vehicle, if the required output from the vehicle side is large, the rate of change in the thickness of the battery cell also increases accordingly. Therefore, it is necessary to further increase the operating speed of the battery pressurizing mechanism, and there is a problem that the battery pressurizing mechanism becomes larger.

[0005] Therefore, an object of the present invention is to provide a control method and a control device for a battery pressurizing mechanism and a vehicle that can apply an appropriate pressure to an all-solid-state battery without making the size of the battery pressurizing mechanism as large as possible even when the required output from the vehicle side is large when the all-solid-state battery is mounted on a vehicle.

Means for Solving the Problems

[0006] In order to solve the above problems, a method for controlling a battery pressurizing mechanism according to an aspect of the present invention is a method for controlling a pressurizing mechanism that pressurizes an all-solid-state battery in its expansion and contraction direction. The pressurizing mechanism includes a pair of pressure plates disposed opposite to each other in the expansion and contraction direction with respect to the all-solid-state battery, a resilient member interposed between the pair of pressure plates to apply a pressing force to the all-solid-state battery, a linear motion mechanism capable of expanding and contracting the opposing distance between the pair of pressure plates, and a drive mechanism for driving the linear motion mechanism. When controlling the pressurizing mechanism, the opposing distance between the pair of pressure plates is measured, and the drive mechanism is controlled based on the relationship between the measured opposing distance and the deflection margin of the deflection amount of the resilient member.

[0007] Also, in order to solve the above problems, a control device for a battery pressurizing mechanism according to an aspect of the present invention is a control device used for a pressurizing mechanism that pressurizes an all-solid-state battery in its expansion and contraction direction. The pressurizing mechanism includes a pair of pressure plates disposed opposite to each other in the expansion and contraction direction with respect to the all-solid-state battery, a resilient member interposed between the pair of pressure plates to apply a pressing force to the all-solid-state battery, a linear motion mechanism capable of expanding and contracting the opposing distance between the pair of pressure plates, and a drive mechanism for driving the linear motion mechanism. The control device includes a measurement unit for measuring the opposing distance and a control unit for controlling the drive mechanism. The control unit controls the drive mechanism based on the relationship between the information on the opposing distance and the information on the deflection margin of the deflection amount of the resilient member.

[0008] Also, in order to solve the above problems, a vehicle according to an aspect of the present invention is a vehicle equipped with an all-solid-state battery, and includes a pressurizing mechanism for pressurizing the all-solid-state battery in its expansion and contraction direction and a control device for controlling the pressurizing mechanism. The control device has a control device for a battery pressurizing mechanism according to an aspect of the present invention.

Advantages of the Invention

[0009] According to the present invention, even when the required output is large, an appropriate pressure can be applied to the all-solid-state battery without making the size of the battery pressurizing mechanism as large as possible.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] Hereinafter, an embodiment of the present invention will be described with appropriate reference to the drawings. This embodiment will describe an example in which an all-solid-state battery including a pressurizing mechanism according to one aspect of the present invention is mounted on a vehicle. Note that the drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimensions, the ratio, etc. are different from the actual ones, and there are also parts where the dimensional relationships and ratios are different between the drawings. In addition, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components in the following embodiments.

[0012] [Configuration of Battery Pack] First, an embodiment of a battery pack including a pressurizing mechanism will be described. As shown in FIG. 1, the battery pack 1 of this embodiment includes one battery module 10 as an all-solid-state battery (assembly). The battery module 10 is configured by stacking a plurality of battery cells 12 in the expansion and contraction direction M.

[0013] Each battery cell 12 constituting the battery module 10 is a Li-depositing type all-solid-state battery, which expands and contracts in the stacking direction of the battery cell 12 according to charging and discharging. Here, compared with the conventional liquid Li-b type secondary battery, by using Li metal for the negative electrode, the amount of cell expansion in the stacking direction is much larger in terms of quantity.

[0014] The battery pack 1 of this embodiment includes a housing case 20 that houses the battery module 10 therein, and a pressurizing mechanism 30 that pressurizes the battery module 10 in the expansion and contraction direction M of the plurality of battery cells 12. The housing case 20 is, for example, a rectangular parallelepiped-shaped metal (e.g., aluminum alloy) housing, and is stored in a housing posture in which a plurality of battery cells 12 are stacked along the long side direction of the housing case 20.

[0015] The pressurizing mechanism 30 of this embodiment is disposed between the end face on one side (lower side in the figure) of the battery module 10 and the short side of the housing case 20 facing the end face. Thereby, in the battery module 10 inside the housing case 20, the plurality of battery cells 12 are held in a stacked arrangement state in a state of being constantly pressurized upward in the expansion and contraction direction M by the pressurizing mechanism 30 below in the figure.

[0016] [Configuration of Pressurizing Mechanism] Next, the pressurizing mechanism 30 will be described in more detail. As shown in an enlarged view of the main part in FIG. 2, the pressurizing mechanism 30 of this embodiment includes a pair of pressure plates 31 and 32 disposed opposite to the battery module 10 in the expansion and contraction direction M, a resilient member 50 interposed between the pair of pressure plates 31 and 32, a linear motion mechanism 40 that changes the opposing distance between the pair of pressure plates 31 and 32 along the expansion and contraction direction M, and a drive mechanism 60 that drives the linear motion mechanism 40.

[0017] In this embodiment, as a pair of pressing plates 31 and 32, it has a cell-side pressing plate 32 that abuts against the battery module 10 and a drive-side pressing plate 31 that is linearly moved by a linear motion mechanism 40. The cell-side pressing plate 32 abuts against the battery cells 12 located at the end portions facing each other in the expansion / contraction direction M, and can press the entire battery module 10. The drive-side pressing plate 31 is configured to be able to advance and retreat in the expansion / contraction direction M in response to the drive of a drive mechanism 60, as will be described later.

[0018] The drive mechanism 60 is disposed on the opposite side of the elastic member 50 with respect to the drive-side pressing plate 31. In the drive mechanism 60 of this embodiment, a motor 63 is fixed to the inner wall surface of the housing case 20 via a drive unit holder 70 (see FIG. 1). A worm gear is adopted for the drive mechanism 60. The worm gear is a rotation mechanism that combines a worm (screw gear) 61 and a worm wheel (helical gear) 62 that meshes with the worm 61.

[0019] The worm 61 is coaxially provided at the tip of the output shaft of the motor 63. When the worm 61 rotates due to the drive of the motor 63, the teeth of the worm wheel 62 are sent in the circumferential direction to rotate the worm wheel 62. In this embodiment, the lead angle of the worm 61 is set to be small so that self-locking is possible, and the transmission of rotation from the worm wheel 62 side to the worm 61 side is prevented.

[0020] Also, in this embodiment, the linear motion mechanism 40 adopts a ball screw using, for example, a feed screw. The ball screw includes a nut 42 having a spiral thread groove formed on its inner peripheral surface, a screw shaft 41 having a spiral thread groove formed on its outer peripheral surface facing the thread groove of the nut 42, and a number of balls (not shown) interposed in a ball rolling path formed between the opposing thread grooves of the screw shaft 41 and the nut 42.

[0021] The number of balls is built in so as to be infinitely circulatable by a ball circulation mechanism (not shown) including a ball circulation path and the like. The member screw shaft 41 penetrates the drive-side pressing plate 31 in the expansion / contraction direction M, and the flange end surface of the nut 42 is fixed to the drive-side pressing plate 31. Furthermore, the nut 42 is screwed onto the screw shaft 41 via a number of balls, and the drive-side pressure plate 31 is mounted so as to be linearly movable in the expansion and contraction direction M in response to the rotation of the screw shaft 41. Note that the linear motion mechanism 40 is not limited to a ball screw, and a feed screw without balls may be used, or other linear motion mechanisms may be employed.

[0022] The pressure elastic member 50 of the present embodiment is configured to have a plurality of springs 51 interposed in parallel between the cell-side pressure plate 32 and the drive-side pressure plate 31 so as to be able to disperse the pressing force on the battery module 10. As the pressure elastic member 50, various types of elastic bodies such as springs and rubbers can be arranged between the pair of pressure plates 31 and 32.

[0023] The spring 51 of the present embodiment is an example of a cylindrical coil spring. As shown in Fig. 3(a), as the plurality of springs 51, eight cylindrical coil springs are arranged in parallel in a plan view (4 in the longitudinal direction × 2 rows up and down = 8). In particular, in the present embodiment, the cylindrical center of each cylindrical coil spring (the position of the × mark indicated by reference numeral 51c in the figure) is located inside the projection plane of the electrode portion of the battery cell 12 (the shaded range indicated by reference numeral 12m in the figure). Thereby, the stress applied to the edge portion of the electrode of the battery cell 12 during pressurization can be relieved. Also, it is possible to prevent or suppress failures such as end cracking of the electrode portion due to pressurization. Note that the two-dot chain line (32) shown in Fig. (b) of the same figure shows an image in which the cell-side pressure plate is curved due to the non-uniform action of the pressing force F in a case where the pressure elastic member 50 is arranged so as not to be able to disperse the pressing force.

[0024] Next, the relationship between the control surface pressure and the lower limit surface pressure peculiar to the pressurization mechanism 30 of the present embodiment will be described. Here, in a Li deposition type all-solid-state battery such as the battery cell 12 of the present embodiment, as described above, compared with a conventional liquid LiB type secondary battery, by using Li metal for the negative electrode, the amount of cell expansion in the stacking direction is much larger in terms of quantity. Therefore, in order to make the pressure applied by the pressurizing mechanism 30 follow the range of appropriate surface pressure with respect to the amount of expansion and contraction of the battery module 10, it is necessary to make the volume of the feed screw portion larger than before. On the other hand, if the volume of the feed screw portion of the linear motion mechanism 40 is increased, the cell capacity decreases, so it is desirable to configure the feed screw portion compactly.

[0025] In contrast, in the pressurizing mechanism 30 of the present embodiment, as shown in FIGS. 1 and 2, it has a pair of opposing pressure plates 31, 32, a resilient member 50, a linear motion mechanism 40, and a drive mechanism 60 for driving the same, and adopts a pressurizing structure in which the resilient member 50 is disposed between the pair of pressure plates 31, 32. According to the pressurizing mechanism 30 of the embodiment, since the linear motion mechanism 40 and the resilient member 50 are not independent but are integrally arranged on the same side in the stacking direction of the battery cell 12, the occupied volume in the expansion and contraction direction M of the pressurizing mechanism 30 is configured compactly, and more battery cells 12 can be arranged in the space corresponding to the arrangement of the spring 51. Further, according to the pressurizing mechanism 30 of the embodiment, by interposing the resilient member 50 between the pair of pressure plates 31, 32, when absorbing the displacement of the battery cell 12 in the expansion and contraction direction M, the tilting and non-uniformity of the cell-side pressure plate 32 can be absorbed, and the surface pressure distribution can be made more uniform.

[0026] In particular, in the pressurizing mechanism 30 of the present embodiment, the linear motion direction of the linear motion mechanism 40 and the spring deflection direction of the resilient member 50 are arranged in series in the expansion and contraction direction M. Thereby, according to the pressurizing mechanism 30 of the embodiment, the control for making the applied pressure follow the range of appropriate surface pressure becomes easy. That is, in the present embodiment, by arranging the pressure-resistant member 50 in series in the stacking direction of the battery cells 12 and interposing it between the pair of pressure plates 31 and 32, as shown in FIG. 4, the surface pressure of the battery cells 12 is controlled within the range of the appropriate surface pressure (the range between the control surface pressure and the lower limit surface pressure in the figure). As shown in the image, the surface pressure of the battery cells 12 can be controlled by the energy stored in the pressure-resistant member 50 by the amount of deflection δ in the expansion and contraction direction M of the pressure-resistant member 50.

[0027] Accordingly, according to the pressing mechanism 30 of the present embodiment, it is possible to also serve as a displacement absorption mechanism in the expansion and contraction direction M of the battery cells 12. In particular, according to the pressing mechanism 30 of the embodiment, it is not necessary to perform fine displacement adjustment using the feed screw in the linear motion mechanism 40 in order to adapt to the required surface pressure during cell charge and discharge, and the workload of the drive mechanism 60 can be reduced.

[0028] In the figure, the two dashed lines (control surface pressure, lower limit surface pressure) shown vertically indicate the range of the appropriate surface pressure, and the plurality of white arrows each show an image following according to the amount of deflection δ in the expansion and contraction direction M of the pressure-resistant member 50. Furthermore, in the figure, the shaded arrows shown between the plurality of white arrows indicate that the control device 80 of the pressing mechanism 30 drives the drive mechanism 60 in response to the shortage of the amount of deflection δ of the pressure-resistant member 50 by executing the "outputtable power setting process" described later, and controls the opposing distance between the pair of pressure plates 31 and 32. Each shows an image.

[0029] [Control Device and Control Method of Pressing Mechanism] Next, a control device 80 and a control method for controlling the pressing mechanism 30 will be described. As shown in FIG. 1, the control device 80 of the present embodiment includes a measurement unit 81 that measures the opposing distance W between the pair of pressure plates 31 and 32, and a control unit 82 that controls the drive mechanism 60. A distance sensor is used for the measurement unit 81. As the distance sensor, various sensors such as an ultrasonic sensor, an infrared distance sensor, and a laser distance sensor can be appropriately adopted as long as the opposing distance W between the pair of pressure plates 31 and 32 can be measured.

[0030] The control unit 82 is configured to include a CPU (Central Processing Unit), a memory, and an input / output port for inputting and outputting various signals. The memory includes, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), and a rewritable non-volatile memory. Various controls are executed by the CPU executing programs such as the "maximum possible output setting process" stored in the memory.

[0031] Then, the control unit 82 is connected to the motor 63 of the drive mechanism 60 via a driver and harnesses (not shown) so as to be able to drive and control the drive mechanism 60, and is connected to the vehicle controller 90 that controls the entire vehicle via the harnesses so as to be able to exchange necessary information. In addition, the vehicle controller 90 is connected to a meter 100 installed in the vehicle interior so that it can be visually recognized by the driver of the vehicle. The meter 100 is configured to be able to display information necessary for the driver in response to a request from the vehicle controller 90.

[0032] Here, the control unit 82 of the present embodiment is configured to be able to execute the program of the "maximum possible output setting process", and as shown in FIG. 4, it is possible to control the drive mechanism 60 based on the relationship between the information of the above-mentioned facing distance W and the information of the deflection margin of the deflection amount δ of the elastic member 50. Specifically, in the control unit 82, when the maximum possible output setting process is executed, as shown in FIG. 5, first, it shifts to step S10 to acquire the information of the facing distance W measured by the measurement unit 81, and in the subsequent step S20, it acquires the information of the power that can be output by the entire vehicle from the vehicle controller 90 side. Furthermore, a table (FIG. 6) in which a plurality of corresponding continuable lines mapped in a ROM in advance and called to a RAM during execution is referred to. At this time, in the continuable line corresponding to the information on the outputtable power of the entire vehicle (in this example, the t = 30-second continuable line), based on the information on the oncoming distance W, the first maximum power P1 is determined. Then, the process proceeds to the subsequent step S3, and the information on the measured oncoming distance W and the information on the first maximum output P1 are fed back to the vehicle controller 90.

[0033] Next, the process proceeds to step S40, the above-mentioned mapped table (FIG. 6) is referred to, and on the table, the information on the acquired current oncoming distance W and the information on the amount of deflection δ in the expansion and contraction direction M of the elastic member 50 are compared. In the corresponding continuable line, it is determined whether there is a margin of the deflection margin Xa with respect to the information on the oncoming distance W measured by the measuring unit 81 (that is, the current amount of deflection X, the same applies hereinafter), and the second maximum output P2 is set according to whether there is a margin (see FIG. 7).

[0034] Here, the second maximum output P2 is determined by a table mapped in advance for each deflection margin Xa (mm) determined by the following (Equation 1). Xa = t×(a - b) ····· (Equation 1) However, a: the change rate of the thickness of the battery cell constituting the all-solid-state battery (mm / s) b: the maximum speed that the drive mechanism can follow (mm / s) t: the continuous time (s) that the maximum output can be output

[0035] Note that the change rate of the thickness a (mm / s) is a value determined by the physical properties of the battery cell and the second maximum output P2, and the continuous time t (s) is a fixed value determined by the setting. Also, the maximum speed b (mm / s) is a fixed value determined by the structure of the pressurizing mechanism 30. In the pressurizing mechanism 30 of the present embodiment, the maximum response speed that the drive mechanism 60 can follow has at least a following speed that can satisfy a rapid charging request from the vehicle controller 90 side and a following speed below the maximum output requirement of the vehicle.

[0036] As a result, for example, as shown in an example in Fig. 7(a), when there is a margin in the deflection margin Xa with respect to the current deflection amount X (Yes in step S40), it is determined that the second maximum output P2 higher than the first maximum power P1 can be maintained for a predetermined time or more, and it is determined that the critical drive control of the drive mechanism 60 is unnecessary. Accordingly, in the transition step S41, the maximum output is set to the second maximum output P2 higher than the first maximum power P1. Also, in step S42, a series of drive controls for the drive mechanism 60 when P1 < P2 are performed. Subsequently, in step S50, the information of the second maximum output P2 is fed back to the vehicle controller 90, and the process returns to step S10.

[0037] On the other hand, for example, as shown in an example in Fig. 7(b), when there is no margin in the deflection margin Xa with respect to the current deflection amount X (No in step S40), since the deflection amount δ of the elastic member 50 is small (none), it is determined that the time during which the second maximum output P2 can be maintained is reduced (none), and it is determined that the critical drive control of the drive mechanism 60 is necessary. Accordingly, in the transition step S43, the second maximum output P2 is set to a value lower than the first maximum power P1. Also, in step S44, a series of drive controls for the drive mechanism 60 when P1 > P2 are performed. Subsequently, in step S50, the information of the second maximum output P2 is fed back to the vehicle controller 90, and the process returns to step S10.

[0038] [Operating effects of the pressure mechanism control device and control method] Next, the operating effects of the control device 80 and control method of the pressure mechanism 30 of the present embodiment will be described. By the way, in an all-solid-state battery (ASSB), a pressure mechanism is required that constantly applies a surface pressure within a predetermined range to the battery cell while following the change in thickness in the stacking direction of the battery cell according to charge and discharge. However, when the maximum output required on the vehicle side is large, the change rate of the thickness of the battery cell accordingly also becomes large. Therefore, an increase in the rotational speed or gear ratio of the motor driving the pressurizing mechanism increases the module size, deteriorating the energy density (including cost and weight). In addition, the durability of the pressurizing mechanism decreases due to high-speed rotation. Thus, in order to increase the required output on the vehicle side, the components of the pressurizing mechanism become larger, and there is a potential problem that in a battery pack employing all-solid-state batteries, it is inevitable to sacrifice energy density, cost, and weight.

[0039] In contrast, as shown in FIG. 1, the control device 80 of the present embodiment includes a measurement unit 81 that measures the opposing distance W between the pair of pressure plates 31 and 32, and a control unit 82 that controls the drive mechanism 60. Then, as shown in FIGS. 4 and 5, the control unit 82 can control the drive mechanism 60 as space-saving and efficiently as possible based on the relationship between the information W of the opposing distance and the information of the deflection margin of the deflection amount δ of the elastic member 50. Therefore, according to the control device 80 and the control method according to the present embodiment, it is possible to improve the maximum output value of the battery pack 1 without enlarging the components of the pressurizing mechanism as much as possible [Invention 1], [Invention 2], [Invention 10].

[0040] In particular, as shown in FIGS. 5 and 6, the control unit 82 of the present embodiment executes "maximum possible output setting processing", and determines a first maximum power P1 as the maximum output that can be discharged according to the opposing distance W between the pair of pressure plates 31 and 32 with respect to the output sustainable power corresponding to the vehicle request. Then, based on the current information of the opposing distance W and the information of the deflection margin, when it is determined that there is a margin in the deflection margin, the maximum output that can be discharged is set to a second maximum output P2 higher than the first maximum output P1, and when it is determined that there is no margin in the deflection margin, the maximum output that can be discharged is set to a second maximum output P2 lower than the first maximum output P1. Therefore, according to the control device 80 and the control method according to the present embodiment, by dividing the time for maintaining the maximum output value of the battery pack 1 at a predetermined time, the frequency of sudden output reduction can be effectively suppressed [Invention 3].

[0041] Further, as shown in FIGS. 6 and 7, the control unit 82 of the present embodiment refers to a pre-mapped table and determines the second maximum output P2 by the above (Equation 1) for each deflection margin Xa (mm) of the elastic member 50. Therefore, in response to the maximum output request from the vehicle controller 90 side, it is suitable for quickly determining the appropriate value of the second maximum output P2 and its sustainable time according to the opposing distance W between the pair of pressure plates 31 and 32 and the deflection amount δ of the elastic member 50 with a low processing load [Invention 4].

[0042] Furthermore, according to the control method of the control device 80 according to the present embodiment, as shown in FIG. 7(a), when it is determined that the second maximum output P2 higher than the first maximum power P1 can be continued for a predetermined time or more, the second maximum output P2 can be increased according to the opposing distance W between the pair of pressure plates 31 and 32 and the deflection amount δ of the elastic member 50. Therefore, it is suitable as a way of imposing restrictions that minimizes the discomfort to the driver of the vehicle with respect to the maximum output request of the vehicle [Invention 5].

[0043] Also, according to the control method of the control device 80 according to the present embodiment, as shown in FIG. 7(b), when it is determined that due to the decrease in the deflection amount δ, there is no margin in the deflection margin Xa and the time for continuing the second maximum output P2 has decreased, the second maximum output P2 is decreased to a value lower than the first maximum power P1. Therefore, the second maximum output P2 can be set to an appropriate value according to the opposing distance between the pair of pressure plates 31 and 32 and the deflection amount δ of the elastic member 50. Therefore, it is suitable as a way of imposing restrictions that minimizes the discomfort to the driver of the vehicle with respect to the maximum output request of the vehicle [Invention 6].

[0044] As described above, according to the control method of the pressurizing device for the battery pressurizing mechanism of the present embodiment, even when the required output from the vehicle side is large, an appropriate pressure can be applied to the battery module of the all-solid-state battery without increasing the size of the pressurizing mechanism. Note that the control method and the pressurizing device for the battery pressurizing mechanism according to the present invention are not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0045] For example, the control method and the pressurizing device for the battery pressurizing mechanism according to the present invention are not limited to being mounted on a vehicle, and can be adopted in various devices equipped with all-solid-state batteries. However, it goes without saying that it can be suitably mounted on a vehicle. For example, when an all-solid-state battery according to the present invention is mounted on a vehicle, as illustrated in the above embodiment, it is preferable that the control unit 82 feedbacks information on the first maximum output P1 and the second maximum output P2 to the vehicle controller 90. Thereby, it is possible to impose a limit that minimizes the discomfort of the driver of the vehicle with respect to the maximum output requirement of the vehicle [Invention 7].

[0046] In particular, the required maximum output of a vehicle is often short-term such as during acceleration, and in order to satisfy the requirement in such a short time, it becomes a factor for increasing the size of the pressurizing mechanism. On the other hand, in the pressurizing mechanism 30 of the present embodiment, as described above, the continuously sustainable output (that is, the maximum response speed that the drive mechanism 60 can follow) has a follow-up speed that can satisfy at least the rapid charging requirement from the vehicle controller 90 side, and has a follow-up speed below the maximum output requirement of the vehicle. Thereby, according to the pressurizing mechanism 30 of the present embodiment, by suppressing the specifications of the drive mechanism 60 so as to be able to follow the rapid charging input that performs continuous energization with a relatively high output, it is possible to avoid increasing the size of the pressurizing mechanism 30 without impairing the marketability [Invention 8].

[0047] In addition, as shown in FIG. 1, the vehicle equipped with the pressurizing device of the present embodiment has a meter 100 visible to the driver of the vehicle, and it is preferable that the value of the second maximum output P2 and its sustainable time, or the value of the second maximum output P2 can be displayed on the meter 100. Thereby, the driver can grasp the value of the second maximum output P2 that can be maintained for a predetermined time and its sustainable time by visually recognizing the meter 100. Therefore, it is possible to avoid a sudden output drop, and it is possible to improve the entertainment property (time attack, etc.) during a race or the like [Invention 9].

Explanation of Reference Numerals

[0048] 1 Battery pack 10 Battery module (all-solid-state battery) 12 Battery cell (all-solid-state battery) 20 Housing case 30 Pressurizing mechanism (battery pressurizing mechanism) 31 Cell-side pressure plate 32 Drive-side pressure plate 40 Linear motion mechanism 41 Screw shaft 42 Nut 50 Elastic member 51 Spring (cylindrical coil spring) 52 Slide guide 60 Drive mechanism 61 Worm 62 Worm wheel 63 Motor 70 Drive unit holder 71 Pinion shaft 72 Pinion 80 Control device 81 Measuring unit 82 Control unit 90 Vehicle controller 100 Meter M Telescopic direction P1 First maximum output P2 Second maximum output

Claims

1. A method for controlling a pressurizing mechanism that pressurizes an all-solid-state battery in its expansion and contraction direction, comprising: The pressurizing mechanism includes: A pair of pressure plates arranged to face each other in the expansion and contraction direction with respect to the all-solid-state battery; A resilient member interposed between the pair of pressure plates to apply a pressing force to the all-solid-state battery; A linear motion mechanism capable of expanding and contracting the opposing distance between the pair of pressure plates; A drive mechanism for driving the linear motion mechanism, and When controlling the pressurizing mechanism, measuring the opposing distance between the pair of pressure plates, and controlling the drive mechanism based on the relationship between the measured opposing distance and the deflection margin of the deflection amount of the resilient member. A method for controlling a battery pressurizing mechanism, characterized in that.

2. A control device used for a pressurizing mechanism that pressurizes an all-solid-state battery in its expansion and contraction direction, comprising: The pressurizing mechanism includes: A pair of pressure plates arranged to face each other in the expansion and contraction direction with respect to the all-solid-state battery; A resilient member interposed between the pair of pressure plates to apply a pressing force to the all-solid-state battery; A linear motion mechanism capable of expanding and contracting the opposing distance between the pair of pressure plates; A drive mechanism for driving the linear motion mechanism, and The control device includes: A measuring unit for measuring the opposing distance; A control unit for controlling the drive mechanism, and The control unit controls the drive mechanism based on the relationship between the information on the opposing distance and the information on the deflection margin of the deflection amount of the resilient member. A control device for a battery pressurizing mechanism, characterized in that.

3. The control unit: Based on the information on the opposing distance measured by the measuring unit, determines a first maximum output as the maximum output that can be discharged with respect to the output sustainable power according to the output requirement, and Based on the current information on the opposing distance and the information on the deflection margin, When it is determined that there is a margin in the deflection margin, sets the maximum output that can be discharged to a second maximum output higher than the first maximum output, When it is determined that there is no margin in the deflection margin, sets the maximum output that can be discharged to a second maximum output lower than the first maximum output. The control device for a battery pressurizing mechanism according to Claim 2.

4. The control unit refers to a pre-mapped table and determines the second maximum output according to the following (Equation 1) for each deflection margin Xa (mm) of the resilient member. The control device for a battery pressurizing mechanism according to Claim 3. Xa = t × (a - b)......(Equation 1) However, a: The change rate of the thickness of the battery cell constituting the all-solid-state battery (mm / s) b: Maximum speed (mm / s) that the drive mechanism can follow t: Duration (s) for which the maximum output can be output

5. The control unit updates the maximum output to a second maximum output greater than the first maximum output when the deflection margin Xa of the elastic member has a margin with respect to the current deflection amount X of the elastic member. The control device for a battery pressurizing mechanism according to claim 4.

6. The control unit updates the maximum output to a second maximum output smaller than the first maximum output when the deflection margin Xa of the elastic member has no margin with respect to the current deflection amount X of the elastic member. The control device for a battery pressurizing mechanism according to claim 4.

7. The all-solid-state battery is mounted on a vehicle, The vehicle has a vehicle controller that controls the entire vehicle, The control unit feeds back information on the second maximum output to the vehicle controller. The control device for a battery pressurizing mechanism according to claim 3.

8. The maximum response speed that the drive mechanism can follow has at least a follow-up speed that can satisfy a rapid charging request from the vehicle controller side and a follow-up speed below the maximum output request from the vehicle controller side. The control device for a battery pressurizing mechanism according to claim 7.

9. The vehicle has a meter visible to the driver of the vehicle, The meter is configured to be able to display the value of the second maximum output and its sustainable time, or the value of the second maximum output, in response to a request from the vehicle controller. The control device for a battery pressurizing mechanism according to claim 7.

10. A vehicle equipped with an all-solid-state battery, A pressurizing mechanism that pressurizes the all-solid-state battery in its expansion and contraction direction, and a control device that controls the pressurizing mechanism, The vehicle is characterized by having the control device for a battery pressurizing mechanism according to any one of claims 2 to 9 as the control device.

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