Aging pretreatment facility and method for producing battery unit

Abstract

To efficiently produce a battery unit by reducing a tact time.SOLUTION: An aging pretreatment facility 1 includes: a container 20 in which a battery unit 10 in which a plurality of battery cells 5 is arranged in a pressing direction D1 is disposed; a first press machine 30A; a second press machine 30B; and a control device 100. The control device 100 measures a length L1 of a pressurization direction D1 in a pressurization gap S1 between the battery unit 10 and the container 20 in a state in which the first press machine 30A is driven to perform the measurement pressurization in the pressurization direction D1 with respect to the battery unit 10 at the measurement pressurization value V1, and after the measurement, drives the first press machine 30A to perform a preliminary pressurization with respect to the battery unit 10 at an insertion pressurization value V2. After the preliminary pressurization, the control device 100 drives the second press machine 30B to perform the main pressurization on the battery unit 10 at the insertion pressurization value V2.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to an aging pretreatment facility and a method for manufacturing a battery unit.

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2016-100276 discloses a restraint device for a secondary battery. In the secondary battery, a plurality of battery cells are stacked in the stacking direction. The restraint device is used in the manufacturing process of the secondary battery, and compresses a plurality of battery cells of the secondary battery in the stacking direction. In the manufacturing process of the secondary battery, charging is performed on the secondary battery while a plurality of battery cells are pressurized by the restraint device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when pressurizing a plurality of battery cells, since a pressurization time is required, as a result, a tact time may be required. For example, in a battery cell, a wound or stacked electrode body is housed in a case, and an electrolytic solution is injected into the case. When pressurizing the battery cell, since time is required for the electrolytic solution to be withdrawn from between the wound or stacked electrode bodies, a pressurization time is required. It is preferable that the tact time in manufacturing a secondary battery is short.

Means for Solving the Problems

[0005] The aging pretreatment equipment disclosed herein includes a container for aging treatment, a first press machine disposed at a predetermined first pressing position, a second press machine disposed at a predetermined second pressing position, and a control device. The container has a battery unit having a predetermined number of battery cells with a pair of opposing wide surfaces. The battery unit is disposed in the container such that the battery cells are arranged along a predetermined pressing direction while facing the wide surfaces. The control device includes a measurement pressing unit, a measurement unit, a preliminary pressing unit, and a main pressing unit. The measurement pressing unit drives the first press machine at the first pressing position to perform measurement pressing on the battery unit disposed in the container in the pressing direction with a predetermined measurement pressing value. The measurement unit measures the length in the pressing direction in the pressing gap between the battery unit and the container during the measurement pressing. After the measurement unit measures the length in the pressing direction in the pressing gap, the preliminary pressing unit drives the first press machine at the first pressing position to perform preliminary pressing on the battery unit disposed in the container in the pressing direction with a predetermined insertion pressing value. After the preliminary pressing, the main pressing unit drives the second press machine at the second pressing position to perform main pressing on the battery unit disposed in the container in the pressing direction with the insertion pressing value.

[0006] The method for manufacturing a battery unit disclosed herein includes a preparation step, an arrangement step, a measurement pressurization step, a measurement step, a preliminary pressurization step, and a main pressurization step. In the preparation step, a container for aging treatment and a battery unit having a predetermined number of battery cells with a pair of opposing wide surfaces are prepared. In the arrangement step, while opposing the wide surfaces, the battery cells are arranged along a predetermined pressurization direction, and the battery unit is arranged in the container. In the measurement pressurization step, at a predetermined first pressurization position, measurement pressurization is performed in the pressurization direction on the battery unit arranged in the container with a predetermined measurement pressurization value. In the measurement step, the length in the pressurization direction in the pressurization gap between the battery unit and the container during the measurement pressurization is measured. In the preliminary pressurization step, after the measurement step, at the first pressurization position, preliminary pressurization is performed in the pressurization direction on the battery unit arranged in the container with a predetermined insertion pressurization value. In the main pressurization step, after the preliminary pressurization step, at a predetermined second pressurization position, main pressurization is performed in the pressurization direction on the battery unit arranged in the container with the insertion pressurization value.

[0007] According to the aging pretreatment facility and the method for manufacturing the battery unit described above, by performing preliminary pressurization on the battery unit at the first pressurization position, main pressurization is performed on the battery unit at the second pressurization position in a state where the battery unit is pressurized to a certain extent. Therefore, the tact time in the main pressurization can be shortened, and the battery unit can be efficiently produced.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0009] Hereinafter, an embodiment of the technology disclosed herein will be described with reference to the drawings. Note that the embodiments described here are not intended to particularly limit the present invention. Each figure is a schematic diagram and does not necessarily faithfully reflect an actual product. Also, members and parts having the same function are appropriately given the same reference numerals, and overlapping descriptions are appropriately omitted.

[0010] FIG. 1 is a block diagram showing the aging pretreatment facility 1 according to the present embodiment. FIGS. 2 and 3 are a plan view and a front view, respectively, showing the battery unit 10 disposed in the container 20. In the drawings, reference sign D1 indicates the first direction, and reference sign D2 indicates the second direction. The first direction D1 and the second direction D2 are orthogonal to each other in a plan view. In the present embodiment, the first direction D1 is an example of the pressurization direction. However, these directions are merely defined for convenience of explanation and should not be construed in a limiting sense.

[0011] The aging pretreatment facility 1 is a facility that performs pretreatment before performing the aging process on the battery unit 10. As shown in FIG. 2, the battery unit 10 has a plurality of battery cells 5. The number of battery cells 5 in one battery unit 10 is not particularly limited and is a predetermined number.

[0012] The configuration of the battery cell 5 is not particularly limited. Here, the battery cell 5 has a rectangular parallelepiped shape and has a pair of wide surfaces 5a facing each other and a pair of narrow surfaces 5b (see FIG. 3) facing each other. The pair of wide surfaces 5a face each other in the first direction D1, and the pair of narrow surfaces 5b face each other in the second direction D2. Here, although one of the pair of narrow surfaces 5b is shown in FIG. 3, the illustration of the other narrow surface 5b is omitted. The wide surface 5a and the narrow surface 5b are surfaces extending vertically and are orthogonal to each other in a plan view. In the present embodiment, the battery cell 5 is a secondary battery capable of repeated charge and discharge by the movement of charge carriers between a pair of electrodes (for example, a positive electrode and a negative electrode) via, for example, an electrolytic solution. The battery cell 5 can be, for example, a lithium-ion secondary battery or a nickel-metal hydride battery. Here, although not shown, the battery cell 5 has, for example, a case, an electrode body housed in the case, and an electrolytic solution housed in the case. The electrode body is laminated or wound in the case. The wide surface 5a and the narrow surface 5b of the battery cell 5 are constituted by the above-described case.

[0013] As shown in FIG. 2, in the battery unit 10, a plurality of battery cells 5 are arranged along the first direction D1. The plurality of battery cells 5 are stacked in the first direction D1. Here, the plurality of battery cells 5 are arranged along the first direction D1 such that the wide surfaces 5a of the battery cells 5 adjacent in the first direction D1 face each other. The wide surfaces 5a of the adjacent battery cells 5 may be in contact. In the present embodiment, although not shown in the drawings, the battery cell 5 is a box-shaped holder with an open upper portion, and is arranged along the first direction D1 while being housed in a resin holder.

[0014] In the present embodiment, as a pretreatment performed before the aging treatment on the battery unit 10, a pressing treatment (in other words, a compression treatment in the first direction D1 on the battery unit 10) is performed on the battery unit 10 along the first direction D1. By performing the pressing treatment as the pretreatment in this way, in the battery cell 5 in the battery unit 10, it is possible to make it difficult for the electrolytic solution to enter between the current collectors in the case. As a result, short-circuit failures (for example, short-circuit failures due to lithium precipitation) can be suppressed.

[0015] In the present embodiment, the pressing treatment is realized by the aging pretreatment facility 1. As shown in FIG. 1, the aging pretreatment facility 1 includes a container 20, a first press 30A, a second press 30B, a moving mechanism 60, a spacer insertion device 80, and a control device 100.

[0016] The container 20 is a container for aging treatment and is a container used in the pretreatment (here, the pressing treatment) of the aging treatment. As shown in FIG. 2, a battery unit 10 having a plurality of battery cells 5 is arranged in the container 20. Here, the battery unit 10 is arranged in the container 20 such that the battery cells 5 are arranged along the first direction D1 while the wide surfaces 5a of the battery cells 5 face each other. In the aging pretreatment facility 1 according to the present embodiment, the pressing treatment is performed on the battery unit 10 as a pretreatment in a state where the battery unit 10 is arranged in the container 20.

[0017] Note that the configuration of the container 20 is not particularly limited. In the present embodiment, as shown in FIG. 2, the container 20 includes a base 21 (see FIG. 3), a first plate 22, a second plate 23, a shaft 24, a first spacer 25, a second spacer 26, and a pressing member 27. The base 21 extends in the horizontal direction and is a plate-like member extending in the first direction D1 and the second direction D2 here.

[0018] The first plate 22 and the second plate 23 are plate-like members extending in the second direction D2 and the vertical direction. The first plate 22 and the second plate 23 are arranged side by side in the first direction D1 and are spaced apart from each other. The battery unit 10 is disposed between the first plate 22 and the second plate 23. Here, the first plate 22 is disposed on one side (the left side in FIG. 2) of the battery unit 10, and the second plate 23 is disposed on the other side (the right side in FIG. 2) of the battery unit 10.

[0019] Here, the shaft 24 extends in the first direction D1 and connects the first plate 22 and the second plate 23. One end of the shaft 24 in the first direction D1 is connected to the first plate 22, and the other end of the shaft 24 in the first direction D1 is connected to the second plate 23. In the present embodiment, a plurality of shafts 24 are provided so as to sandwich the battery unit 10 in the second direction D2. The shaft 24 includes a first shaft 24a provided on one end side of the battery unit 10 in the second direction D2 and a second shaft 24b provided on the other end side of the battery unit 10 in the second direction D2. Here, as shown in FIG. 3, two first shafts 24a are provided side by side in the vertical direction. Although not shown, two second shafts 24b are also provided side by side in the vertical direction. The shaft 24 restricts the movement of the battery unit 10 in the second direction D2 within the container 20.

[0020] The first spacer 25 and the second spacer 26 are arranged side by side in the first direction D1 and sandwich the battery unit 10. Here, the first spacer 25 is disposed between the first plate 22 and the battery unit 10. The second spacer 26 is disposed between the second plate 23 and the battery unit 10.

[0021] The pressing member 27 is a member that presses the battery unit 10 in the first direction D1. Here, the pressing member 27 is a plate-like member and extends in the second direction D2 and the vertical direction. The pressing member 27 is disposed on the other end side (the right side in FIG. 2) of the battery unit 10 in the first direction D1 and is disposed between the second plate 23 (here, the second spacer 26) and the battery unit 10. In the present embodiment, the pressing member 27 presses the battery unit 10 toward one side in the first direction D1 by the first press machine 30A or the second press machine 30B.

[0022] The first press machine 30A and the second press machine 30B shown in FIG. 1 are for pressing the battery unit 10 in the first direction D1 (here, one side in the first direction D1 (the left side in FIG. 2)). Here, as shown in FIG. 1, the first press machine 30A is disposed at a predetermined first pressing position P1. The second press machine 30B is disposed at a predetermined second pressing position P2. Here, the first pressing position P1 and the second pressing position P2 are different positions. In the present embodiment, the configuration of the first press machine 30A and the configuration of the second press machine 30B are the same. Therefore, the configuration of the first press machine 30A will be described here, and the description of the configuration of the second press machine 30B will be omitted as appropriate.

[0023] FIGS. 4 and 5 are a plan view and a front view showing the first press machine 30A and the second press machine 30B, respectively. As shown in FIG. 4, the first press machine 30A and the second press machine 30B each have a reference block 31, a pair of positioning members 33a and 33b, a pair of guide rails 35a and 35b, a pressing body 37, a pressing rod 38, a servo press 39, and a sensor 40.

[0024] The reference block 31 is a block that serves as a reference for determining the position of the container 20 in the first direction D1, and its position is fixed. Further, the reference block 31 is for restricting the movement of the battery unit 10 to one side in the first direction D1 when the battery unit 10 is pressurized. For example, when the container 20 is arranged at the first pressurizing position P1 (see FIG. 1), the reference block 31 of the first press machine 30A is arranged on the side of the first plate 22 in the container 20 and abuts against the first plate 22 from the outside of the container 20. When the container 20 is arranged at the second pressurizing position P2 (see FIG. 1), the reference block 31 of the second press machine 30B is arranged on the side of the first plate 22 in the container 20 and abuts against the first plate 22 from the outside of the container 20.

[0025] As shown in FIG. 4, the pair of positioning members 33a and 33b are members for determining the position of the battery unit 10 in the second direction D2 when pressurizing. The pair of positioning members 33a and 33b extend in the first direction D1 and face each other in the second direction D2. The pair of positioning members 33a and 33b are provided so as to sandwich the container 20. For example, the positioning member 33a is provided at one end side of the container 20 in the second direction D2 and abuts against the base 21 (see FIG. 5). The positioning member 33b is provided at the other end side of the container 20 in the second direction D2 and abuts against the base 21.

[0026] The pair of guide rails 35a and 35b extend in the first direction D1 and face each other. The pair of guide rails 35a and 35b are provided on the side opposite to the reference block 31 in the first direction D1 with respect to the pair of positioning members 33a and 33b.

[0027] The pressing body 37 is engaged with a pair of guide rails 35a and 35b and is movable in the first direction D1 along the pair of guide rails 35a and 35b. The pressing body 37 has a shape that spans the guide rails 35a and 35b. The pressing rod 38 is rod-shaped and extends in the first direction D1 from the pressing body 37 toward the reference block 31. Although not shown in the figure, through holes through which the pressing rod 38 passes are formed in the second plate 23 and the second spacer 26 of the container 20. Here, when the pressing body 37 moves in the first direction D1 toward the reference block 31, the pressing rod 38 is inserted into the through holes of the second plate 23 and the second spacer 26, and the tip of the pressing rod 38 abuts against the pressing member 27 of the container 20. The number of pressing rods 38 is not particularly limited, but here it is six. In the present embodiment, as shown in FIG. 4, in a plan view, three pressing rods 38 are arranged side by side in the second direction D2, and as shown in FIG. 5, when viewed from the second direction D2, two pressing rods 38 are arranged one above the other.

[0028] FIG. 6 is a front view showing the first press 30A and the second press 30B and shows a state in which the battery unit 10 is being pressed. As shown in FIG. 6, the servo press 39 functions as a driving unit for moving the pressing body 37 and the pressing rod 38 in the first direction D1 to press the battery unit 10. As shown in FIG. 4, the servo press 39 has a servo motor 39a and a ball screw 39b. The ball screw 39b extends in the first direction D1. The ball screw 39b is connected to the servo motor 39a and the pressing body 37. Here, when the servo motor 39a is driven, the protruding length of the ball screw 39b from the servo motor 39a changes. By this, the pressing body 37 is pushed toward the reference block 31 side in the first direction D1, and as shown in FIG. 6, while the tip of the pressing rod 38 abuts against the pressing member 27, the pressing member 27 is pushed toward the reference block 31 side. By this, the pressing member 27 moves toward the reference block 31 side, and the battery unit 10 is pressed.

[0029] As shown in Fig. 4, the sensor 40 measures the length L1 in the first direction D1 of the gap (here, the gap between the pressing member 27 adjacent to the battery unit 10 and the second spacer 26, hereinafter referred to as the pressing gap S1) between the battery unit 10 and the container 20 when the battery unit 10 is pressed by the servo press 39 as shown in Fig. 6. If the sensor 40 can measure the length L1 of the pressing gap S1, the position and type of the sensor 40 are not particularly limited. The sensor 40 is, for example, an optical sensor and is provided around where the pressing gap S1 is formed.

[0030] The moving mechanism 60 shown in Fig. 1 is a mechanism that moves the container 20 with the battery unit 10 disposed therein between the first pressing position P1 and the second pressing position P2. In other words, the moving mechanism 60 moves the container 20 so that the container 20 moves between the first press 30A and the second press 30B. The moving mechanism 60 is configured to set the container 20 to the second press 30B, for example, when moving the container 20 from the first pressing position P1 to the second pressing position P2. Further, the moving mechanism 60 is configured to set the container 20 to the first press 30A, for example, when moving the container 20 from the second pressing position P2 to the first pressing position P1. Here, setting the container 20 to the first press 30A (or the second press 30B) means a state in which the battery unit 10 provided in the container 20 can be pressed. As shown in Fig. 4, for example, it means a state in which the container 20 abuts against the reference block 31 and is disposed between the pair of positioning members 33a and 33b. Note that the configuration of the moving mechanism 60 is not particularly limited. Although not shown, the moving mechanism 60 has, for example, a moving guide rail extending from the first pressing position P1 toward the second pressing position P2, a moving body that engages with the moving guide rail and to which the container 20 is detachably provided, and a moving motor that moves the moving body along the moving guide rail. The moving mechanism 60 may have a function of moving the container 20 vertically. Also, the moving mechanism 60 may be a so-called belt conveyor type.

[0031] FIG. 7 is a front view showing the second press machine 30B, and is a view showing a state in which the insertion spacer 70 is inserted into the pressing gap S1. As shown in FIG. 7, the spacer insertion device 80 shown in FIG. 1 is a device for inserting the insertion spacer 70 into the pressing gap S1 between the battery unit 10 and the container 20 when the battery unit 10 is pressed. Note that the configuration of the spacer insertion device 80 is not particularly limited as long as it can insert the insertion spacer 70 into the pressing gap S1 between the battery unit 10 and the container 20. In the present embodiment, the spacer insertion device 80 includes, for example, a gripping arm that collectively grips the insertion spacer 70, and an insertion drive unit that moves the gripping arm and inserts the insertion spacer 70 gripped by the gripping arm into the pressing gap S1 between the battery unit 10 and the container 20.

[0032] As shown in FIG. 7, the insertion spacer 70 includes a resin spacer 71 and a metal spacer 72. Here, the resin spacer 71 is a resin spacer. The number of resin spacers 71 is one. The metal spacer 72 is a metal (for example, stainless steel (SUS)) spacer. The resin spacer 71 has a greater thickness (here, the length in the first direction D1) than the metal spacer 72. In FIG. 7, the number of metal spacers 72 is two, but the number of metal spacers 72 is variable and is appropriately determined according to the length L1 (see FIG. 6) of the pressing gap S1 between the battery unit 10 and the container 20. Note that depending on the length L1 of the pressing gap S1, the number of metal spacers 72 may be zero. Here, the resin spacer 71 and the metal spacer 72 are inserted between the battery unit 10 and the container 20 in a state where they are arranged along the first direction D1.

[0033] FIG. 8 is a view of the resin spacer 71 and the metal spacer 72 as seen from the first direction D1. In FIG. 8, a state where the resin spacer 71 and the metal spacer 72 are inserted into the pressure gap S1 is schematically shown. In the present embodiment, the resin spacer 71 and the metal spacer 72 differ only in thickness and have the same shape. Therefore, hereinafter, the shape of the resin spacer 71 will be described, and the description of the shape of the metal spacer 72 will be appropriately omitted as needed. As shown in FIG. 8, the resin spacer 71 is a plate-shaped member extending in the second direction D2 and is substantially rectangular when viewed from the first direction D1. A recess 73 that is recessed upward from the lower end is formed in the resin spacer 71. When the resin spacer 71 is inserted into the pressure gap S1, the pressure rod 38 is inserted into the recess 73. In the present embodiment, the number of the recesses 73 is three, but it is appropriately determined according to the position and number of the pressure rods 38. Further, a convex portion 74 protruding in the second direction D2 is formed at the upper end portion of the resin spacer 71. The convex portions 74 are formed at both end portions of the resin spacer 71 in the second direction D2 and there are two for one resin spacer 71. When the resin spacer 71 is inserted into the pressure gap S1, the convex portion 74 can be placed on the shaft 24 of the container 20.

[0034] The control device 100 shown in FIG. 1 is a device that controls, for example, the pressurization of the battery unit 10 disposed inside the container 20. The configuration of the control device 100 is not particularly limited. The control device 100 is, for example, a microcomputer. The hardware configuration of the microcomputer is not particularly limited. The control device 100 includes a communication interface (I / F), a central processing unit (CPU) that executes instructions of a control program, a ROM (Read Only Memory) that stores a program executed by the CPU, a RAM (Random Access Memory) used as a working area for developing the program, and a memory that stores the program and various data. The control device 100 may be realized by one control device or may be realized by a plurality of control devices cooperating with each other.

[0035] The control device 100 is communicably connected to a first press 30A (specifically, a servo motor 39a (see FIG. 4) and a sensor 40 (see FIG. 4) of the servo press 39 of the first press 30A), a second press 30B (specifically, a servo motor 39a (see FIG. 4) and a sensor 40 (see FIG. 4) of the servo press 39 of the second press 30B), a moving mechanism 60, and a spacer insertion device 80. The control device 100 is configured to be able to control the driving of each of the first press 30A, the second press 30B, the moving mechanism 60, and the spacer insertion device 80.

[0036] In the present embodiment, as shown in FIG. 1, the control device 100 includes a storage unit 101, a measurement pressurization unit 103, a measurement unit 105, a preliminary pressurization unit 107, a movement control unit 109, a main pressurization unit 111, an insertion unit 113, and a release unit 115. Each unit of the control device 100 may be realized by one or more processors or may be realized by a circuit.

[0037] As described above, the configuration of the aging pretreatment facility 1 according to the present embodiment has been described. Next, a method for manufacturing the battery unit 10 using the aging pretreatment facility 1 will be described. Here, among the methods for manufacturing the battery unit 10, the method of the pressurization process executed as the pretreatment of the aging process will be described in order.

[0038] FIG. 9 is a flowchart showing a method for manufacturing the battery unit 10 (here, the method of the pressurization process) according to the present embodiment. In the present embodiment, as shown in FIG. 9, the method for manufacturing the battery unit 10 includes a preparation step S101, an arrangement step S103, a measurement pressurization step S105, a measurement step S107, a preliminary pressurization step S109, a movement step S111, a main pressurization step S113, an insertion step S115, and a release step S117. Each step will be described below.

[0039] In the preparation step S101 of FIG. 9, as shown in FIG. 2, a battery unit 10 to be subjected to aging treatment and a container 20 for aging treatment are prepared. Here, after a pressure treatment is performed on the battery unit 10 as a pretreatment, the aging treatment is performed. The battery unit 10 has a predetermined number of battery cells 5 as described above, and the battery cells 5 have a pair of opposing wide surfaces 5a. The preparation of the battery unit 10 and the container 20 in this preparation step S101 is performed by an operator.

[0040] Next, in the arrangement step S103 of FIG. 9, as shown in FIG. 2, the battery unit 10 is arranged in the container 20. Here, the battery unit 10 is arranged in the container 20 in a state where a plurality of battery cells 5 of the battery unit 10 are arranged side by side in the first direction D1. In the battery cells 5 adjacent to each other in the first direction D1, a plurality of battery cells 5 are arranged along the first direction D1 while the wide surfaces 5a face each other. In the arrangement step S103, the arrangement of the battery unit 10 in the container 20 may be manually performed by an operator, or may be configured to automatically arrange the battery unit 10 in the container 20 by, for example, a dedicated arrangement device for the battery unit 10. The arrangement step S103 may be executed at the first pressurization position P1 (see FIG. 1), or may be executed at a position different from the first pressurization position P1, and then, for example, by a mechanism for moving the container 20 such as a moving mechanism 60, the container 20 having the battery unit 10 arranged therein may be moved to the first pressurization position P1.

[0041] Next, the measurement pressurization step S105 in FIG. 9 is executed. The measurement pressurization step S105 is executed by the first press machine 30A (see FIG. 1) at the first pressurization position P1, and measurement pressurization is performed on the battery unit 10. Here, measurement pressurization refers to the pressurization of the battery unit 10 when measuring the length L1 (see FIG. 6) in the first direction D1 in the pressurization gap S1 (see FIG. 6) between the battery unit 10 and the container 20. In the present embodiment, the measurement pressurization step S105 is embodied by the measurement pressurization unit 103 of the control device 100 shown in FIG. 1. FIG. 10 is a timing chart showing measurement pressurization and preliminary pressurization. The measurement pressurization unit 103 drives the first press machine 30A at the first pressurization position P1, and performs measurement pressurization on the battery unit 10 disposed in the container 20 in the first direction D1 with a predetermined measurement pressurization value V1 (see FIG. 10). Here, as shown in FIG. 4, with the container 20 in contact with the reference block 31 of the first press machine 30A and disposed at the first pressurization position P1 so as to be sandwiched between the pair of positioning members 33a and 33b, the measurement pressurization unit 103 drives the servo press 39 of the first press machine 30A. As a result, as shown in FIG. 6, the pressurizing body 37 and the pressurizing rod 38 move toward the reference block 31 side in the first direction D1, so that the pressurizing member 27 moves toward the reference block 31 side to pressurize the battery unit 10. At this time, as shown in FIG. 10, the measurement pressurization unit 103 performs measurement pressurization so that the pressurization based on the measurement pressurization value V1 is maintained for a predetermined measurement pressurization time T1. The measurement pressurization value V1 is, for example, 10 kN, and the measurement pressurization time T1 is, for example, 1 second. When the measurement pressurization is performed in this way, the plurality of battery cells 5 of the battery unit 10 are compressed in the first direction D1, so that a pressurization gap S1 as shown in FIG. 6 is formed between the battery unit 10 and the container 20 (specifically, the second spacer 26).

[0042] With the measurement pressure applied in this manner, the measurement process S107 of FIG. 9 is then executed. In the measurement process S107, the length L1 in the first direction D1 of the pressure application gap S1 during measurement pressure application (see FIG. 6) is measured. In the present embodiment, the measurement process S107 is embodied by the measurement unit 105 of the control device 100 in FIG. 1. The measurement unit 105 measures the length L1 of the pressure application gap S1 during measurement pressure application. In the present embodiment, the measurement unit 105 acquires the length L1 of the pressure application gap S1 measured by the sensor 40 (see FIG. 4) of the first press 30A. For example, the measurement unit 105 transmits an acquisition signal to the sensor 40. After receiving the acquisition signal, the sensor 40 measures the length L1 of the pressure application gap S1 and transmits the length L1 to the measurement unit 105. Thus, the measurement unit 105 can acquire the length L1 of the pressure application gap S1 from the sensor 40. Note that the information regarding the length L1 of the pressure application gap S1 during measurement pressure application acquired by the measurement unit 105 is stored in the storage unit 101 in FIG. 1. The measurement of the length L1 of the pressure application gap S1 by the measurement unit 105 may be performed during measurement pressure application. For example, the measurement unit 105 measures the length L1 of the pressure application gap S1 during measurement pressure application at the timing of time t11 in FIG. 10 (i.e., the timing when the measurement pressure application ends). In the following description, unless otherwise specified, the length L1 of the pressure application gap S1 means the length L1 of the pressure application gap S1 during measurement pressure application.

[0043] After measuring the length L1 of the pressurization gap S1 during measurement pressurization in this manner, next, the preliminary pressurization step S109 in FIG. 9 is executed. In the preliminary pressurization step S109, after the measurement step S107, preliminary pressurization is performed on the battery unit 10 at the first pressurization position P1 shown in FIG. 1. Here, the preliminary pressurization is pressurization that is performed after the measurement pressurization and before the main pressurization described later, and is pressurization executed by the first press machine 30A. In the present embodiment, the preliminary pressurization step S109 is embodied by the preliminary pressurization unit 107 of the control device 100 in FIG. 1. After the preliminary pressurization unit 107 measures the length L1 of the pressurization gap S1 by the measurement unit 105, as shown in FIG. 6, the first press machine 30A is driven at the first pressurization position P1 to perform preliminary pressurization on the battery unit 10 disposed in the container 20. Here, the preliminary pressurization is performed without releasing the measurement pressurization. In a state where the container 20 is disposed at the first pressurization position P1, the preliminary pressurization unit 107 drives the servo press 39 (see FIG. 6) of the first press machine 30A. At this time, the preliminary pressurization unit 107 performs preliminary pressurization on the battery unit 10 in the first direction D1 with a predetermined insertion pressurization value V2 (see FIG. 10). Here, as shown in FIG. 10, the preliminary pressurization unit 107 performs preliminary pressurization so that the pressurization based on the insertion pressurization value V2 is maintained for a predetermined preliminary pressurization time T2.

[0044] Here, the insertion pressurization value V2 is larger than the measurement pressurization value V1. The measurement pressurization value V1 is, for example, 1 / 2 or less of the insertion pressurization value V2, preferably 1 / 3 or less, and particularly preferably 1 / 4 or less. The insertion pressurization value V2 is, for example, less than the maximum pressurization value V3 indicating the maximum pressurization that the first press machine 30A can execute. The maximum pressurization value V3 is, for example, 50 kN, and the insertion pressurization value V2 is, for example, 49 kN. The preliminary pressurization time T2 is longer than the measurement pressurization time T1. The preliminary pressurization time T2 is 1.2 times or more of the measurement pressurization time T1, preferably 1.5 times or more, and particularly preferably 2 times or more.

[0045] After the preliminary pressurization is performed in this manner, next, the moving step S111 of FIG. 9 is executed. In the moving step S111, as shown in FIG. 1, the container 20 in which the battery unit 10 is disposed inside is moved from the first pressurization position P1 to the second pressurization position P2. In the present embodiment, the moving step S111 is embodied by the movement control unit 109 of the control device 100 in FIG. 1. The movement control unit 109 controls the movement mechanism 60 to move the container 20 from the first pressurization position P1 to the second pressurization position P2. Here, as shown in FIG. 5, the movement control unit 109 drives the servo press 39 so as to move the pressure body 37 of the first press 30A to the side opposite to the reference block 31, and releases the preliminary pressurization by the first press 30A. For example, in FIG. 10, the preliminary pressurization is released at time t12. To release the preliminary pressurization here means to stop the pressurization by the first press 30A. Thereafter, the movement control unit 109 controls the movement mechanism 60 to move the container 20 toward the second press 30B from the first press 30A, and sets the container 20 to the second press 30B.

[0046] After the moving step S111, the main pressing step S113 in FIG. 9 is executed. In the main pressing step S113, after the preliminary pressing step S109, main pressing is performed on the battery unit 10 at the second pressing position P2 (see FIG. 1). Here, the main pressing is the pressing performed after the preliminary pressing, and is the pressing executed by the second press machine 30B (see FIG. 1). In the present embodiment, the main pressing step S113 is embodied by the main pressing unit 111 of the control device 100 in FIG. 1. FIG. 11 is a timing chart showing the main pressing. The main pressing unit 111 drives the second press machine 30B at the second pressing position P2 after the preliminary pressing, and performs main pressing on the battery unit 10 disposed in the container 20 in the first direction D1 with the insertion pressing value V2 as shown in FIG. 11. The insertion pressing value V2 in the main pressing is the same as the insertion pressing value V2 (see FIG. 10) in the preliminary pressing. Here, in a state where the container 20 is disposed at the second pressing position P2, the main pressing unit 111 drives the servo press 39 of the second press machine 30B. At this time, as shown in FIG. 11, the main pressing unit 111 performs main pressing so that the pressing based on the insertion pressing value V2 is maintained for a predetermined main pressing time T3. Here, the main pressing time T3 is the same as the preliminary pressing time T2 (see FIG. 10). However, the main pressing time T3 may be shorter or longer than the preliminary pressing time T2. The main pressing time T3 is longer than the measured pressing time T1. The main pressing time T3 is 1.2 times or more, preferably 1.5 times or more, and particularly preferably 2 times or more of the measured pressing time T1.

[0047] In the state where such main pressurization is performed, next, the insertion step S115 of FIG. 9 is executed. In the insertion step S115, according to the length L1 of the pressurization gap S1 measured in the measurement step S107 during the main pressurization (that is, the length L1 of the pressurization gap S1 during the measurement pressurization), as shown in FIG. 7, an insertion spacer 70 is inserted into the pressurization gap S1 between the battery unit 10 and the container 20. In the present embodiment, the insertion step S115 is embodied by the insertion unit 113 of the control device 100 in FIG. 1. The insertion unit 113 inserts the insertion spacer 70 into the pressurization gap S1 according to the length L1 of the pressurization gap S1 during the measurement pressurization measured by the measurement unit 105 during the main pressurization. Here, the insertion unit 113 automatically inserts the insertion spacer 70 into the pressurization gap S1 by controlling the drive of the spacer insertion device 80 (see FIG. 1).

[0048] In this embodiment, as the insertion spacer 70, one resin spacer 71 and zero, one, or a plurality of metal spacers 72 are inserted into the pressure gap S1. The insertion part 113 determines the number of metal spacers 72 according to the length L1 of the pressure gap S1 during measurement pressurization. Here, it is set such that the longer the length L1 of the pressure gap S1, the larger the number of metal spacers 72. For example, in the storage part 101 of FIG. 1, a spacer number determination table TB1 as shown in FIG. 12 is stored. In the spacer number determination table TB1, a plurality (eight in FIG. 12) of predetermined length ranges for the length L1 of the pressure gap S1 during measurement pressurization are set. For each length range, the number of metal spacers 72 is set, and in a plurality of length ranges, it is set such that the longer the length L1 of the pressure gap S1, the larger the number of metal spacers 72. The insertion part 113 determines the number of metal spacers 72 to be inserted by referring to, for example, the spacer number determination table TB1 according to the length L1 of the pressure gap S1 during measurement pressurization. For example, when the length L1 of the pressure gap S1 is 3.5 mm, the insertion part 113 determines that the number of metal spacers 72 is two. Here, for the sake of convenience of explanation, the length L1 of the pressure gap S1 is used as a parameter for determining the number of metal spacers 72, but the parameter may be, for example, a value calculated by substituting the length L1 of the pressure gap S1 into a predetermined calculation formula. For example, as the parameter, a value obtained by multiplying the length L1 by a coefficient based on the length L1 and then subtracting the thickness of the resin spacer 71 may be used.

[0049] As shown in FIG. 7, the insertion unit 113 controls a spacer insertion device 80 (see FIG. 1) so as to insert a determined number of metal spacers 72 and one resin spacer 71 into a pressure gap S1 between the battery unit 10 and the container 20 during the main pressing. Here, the resin spacer 71 and zero, one, or a plurality of metal spacers 72 are inserted into the pressure gap S1 so as to be arranged side by side in the first direction D1. At this time, the resin spacer 71 is arranged closer to the battery unit 10 side than the metal spacer 72 and contacts the pressing member 27. Note that, as described above, the number of metal spacers 72 may be zero. Also, in the present embodiment, a set of one resin spacer 71 and a number of metal spacers 72 corresponding to a predetermined length range shown in FIG. 12 may be prepared in advance for each length range. In this case, the insertion unit 113 controls the spacer insertion device 80 so that the spacer insertion device 80 grips the set corresponding to the determined number of metal spacers 72, and controls the spacer insertion device 80 to insert the insertion spacer 70 into the pressure gap S1.

[0050] Note that in the insertion step S115, it is possible to insert the insertion spacer 70 into the pressure gap S1 without using the spacer insertion device 80. For example, the number of metal spacers 72 may be determined according to the length L1 of the pressure gap S1 during the measurement pressing, and an operator may manually insert one resin spacer 71 and the determined number of metal spacers 72 into the pressure gap S1.

[0051] Thus, after inserting the insertion spacer 70 into the pressurization gap S1 during the main pressurization, the release process S117 in FIG. 9 is then executed. In the release process S117, the main pressurization on the battery unit 10 is released. In the present embodiment, the release process S117 is embodied by the release unit 115 of the control device 100 in FIG. 1. FIG. 13 is a front view showing the second press machine 30B and is a view showing the state where the main pressurization has been released. After the insertion spacer 70 is inserted by the insertion unit 113, the release unit 115 releases the main pressurization on the battery unit 10 by the second press machine 30B as shown in FIG. 13. Here, releasing the main pressurization means stopping the pressurization by the second press machine 30B. Here, the release unit 115 controls the drive of the servo press 39 so that the pressurizing body 37 of the second press machine 30B moves away from the battery unit 10. At this time, as shown in FIG. 13, the main pressurization is released as the pressurizing rod 38 moves away from the pressurizing member 27 of the container 20. When the main pressurization is released, the compressed state of the battery unit 10 is partially released, and the metal spacer 72 comes into contact with the second spacer 26. At this time, typically, in the state where the main pressurization has been released, a measurement pressurization may be applied to the battery unit 10 disposed in the container 20, that is, a pressurization with a measurement pressurization value V1 may be applied.

[0052] Through the above procedure, the pressurization process as a pretreatment for the battery unit 10 is completed. After the pressurization process is completed, as shown in FIG. 13, an aging process is performed on the battery unit 10 pressurized in the container 20.

[0053] As described above, in this embodiment, as shown in FIG. 1, the aging pretreatment facility 1 includes a container 20 for aging treatment, a first press 30A, and a second press 30B. As shown in FIG. 2, the container 20 has a battery unit 10 having a predetermined number of battery cells 5 with a pair of wide surfaces 5a facing each other. The battery unit 10 is arranged in the container 20 such that the battery cells 5 are arranged along the first direction D1, which is an example of a predetermined pressing direction, with the wide surfaces 5a facing each other. As shown in FIG. 1, the first press 30A is arranged at a predetermined first pressing position P1. The second press 30B is arranged at a predetermined second pressing position P2. The control device 100 includes a measurement pressing unit 103, a measurement unit 105, a preliminary pressing unit 107, and a main pressing unit 111. The measurement pressing unit 103 implements the measurement pressing step S105 in FIG. 9. The measurement pressing unit 103 drives the first press 30A at the first pressing position P1 to perform measurement pressing on the battery unit 10 arranged in the container 20 in the first direction D1 with a predetermined measurement pressing value V1 (see FIG. 10). The measurement unit 105 implements the measurement step S107 in FIG. 9. The measurement unit 105 measures the length L1 (see FIG. 6) in the first direction D1 of the pressing gap S1 between the battery unit 10 and the container 20 during measurement pressing. The preliminary pressing unit 107 implements the preliminary pressing step S109 in FIG. 9. After the measurement unit 105 measures the length L1 of the pressing gap S1, the preliminary pressing unit 107 drives the first press 30A at the first pressing position P1 to perform preliminary pressing on the battery unit 10 arranged in the container 20 in the first direction D1 with a predetermined insertion pressing value V2 (see FIG. 10). The main pressing unit 111 implements the main pressing step S113 in FIG. 9. After preliminary pressing, the main pressing unit 111 drives the second press 30B at the second pressing position P2 to perform main pressing on the battery unit 10 arranged in the container 20 in the first direction D1 with the insertion pressing value V2 (see FIG. 11).

[0054] By doing this, at the first pressing position P1, the first press machine 30A performs preliminary pressing on the battery unit 10, so that the battery unit 10 is pressed to a certain extent, and at the second pressing position P2, the second press machine 30B performs main pressing on the battery unit 10. Therefore, since the tact time in the main pressing can be shortened, the battery unit 10 can be efficiently produced.

[0055] In the present embodiment, the aging pretreatment facility 1 includes a spacer insertion device 80 (see FIG. 1) that inserts an insertion spacer 70 into a gap (here, the pressing gap S1 (see FIG. 6)) between the main-pressed battery unit 10 and the container 20 at the second pressing position P2. As shown in FIG. 1, the control device 100 includes an insertion unit 113 and a release unit 115. The insertion unit 113 realizes the insertion process S115 in FIG. 9. The insertion unit 113 controls the spacer insertion device 80 to insert the insertion spacer 70 into the pressing gap S1 during the main pressing between the battery unit 10 and the container 20 according to the length L1 (see FIG. 6) of the pressing gap S1 during the measurement pressing measured by the measurement unit 105. The release unit 115 realizes the release process S117 in FIG. 9. The release unit 115 releases the main pressing on the battery unit 10 by the second press machine 30B after the insertion spacer 70 is inserted by the insertion unit 113. In the present embodiment, since there are individual differences in the battery cells 5 constituting the battery unit 10, the length L1 of the pressing gap S1 may vary during the measurement pressing. However, in the present embodiment, since the insertion spacer 70 is inserted into the pressing gap S1 during the main pressing based on the actually measured length L1 of the pressing gap S1, the variation in the pressure applied to the battery unit 10 when the main pressing is released can be suppressed. Therefore, the battery unit 10 can be produced to have a uniform quality.

[0056] In this embodiment, as shown in FIG. 7, the insertion spacer 70 includes a resin spacer 71 made of resin and a metal spacer 72 made of metal. The resin spacer 71 has an elastic force as compared with the metal spacer 72. Therefore, by combining the resin spacer 71 and the metal spacer 72 and using them for insertion into the pressure gap S1, the degree of adhesion between the battery unit 10 and the container 20 and the insertion spacer 70 can be increased while ensuring the required thickness of the insertion spacer 70 (that is, the thickness of the insertion spacer 70 corresponding to the length L1 of the pressure gap S1).

[0057] In this embodiment, the insertion portion 113 determines the number of metal spacers 72 to be inserted into the pressure gap S1 between the battery unit 10 and the container according to the length L1 of the pressure gap S1 measured by the measurement unit 105, and inserts the determined number of metal spacers 72 into the pressure gap S1 between the battery unit 10 and the container 20 during the main pressing. Here, it is set such that the longer the length L1 of the pressure gap S1 during the measurement pressing, the larger the number of metal spacers 72. In this way, by increasing or decreasing the number of metal spacers 72, the thickness of the insertion spacer 70 can be changed. Therefore, according to the length L1 of the pressure gap S1 during the measurement pressing, the thickness of the insertion spacer 70 inserted into the pressure gap S1 during the main pressing can be easily changed.

[0058] As described above, the invention disclosed herein has been variously described. Unless otherwise particularly mentioned, the embodiments and the like mentioned herein do not limit the present invention. In addition, the embodiments of the invention disclosed herein can be variously modified, and unless particularly problematic, each component and each process mentioned herein can be appropriately omitted or appropriately combined.

[0059] As described above, this specification includes the disclosures described in the following respective items. Item 1: An aging treatment container in which a battery unit having a predetermined number of battery cells having a pair of opposing wide surfaces is disposed, A first press machine disposed at a predetermined first pressing position, A second press machine disposed at a predetermined second pressing position, A control device, Comprising, The battery unit is disposed in the container such that the battery cells are arranged along a predetermined pressing direction while facing the wide surfaces, The control device, A measurement pressurizing unit that drives the first press machine at the first pressing position to perform measurement pressurization in the pressing direction on the battery unit disposed in the container with a predetermined measurement pressurization value, A measurement unit that measures the length in the pressing direction in the pressurization gap between the battery unit and the container during the measurement pressurization, After measuring the length in the pressing direction in the pressurization gap by the measurement unit, the first press machine is driven at the first pressing position to perform preliminary pressurization in the pressing direction on the battery unit disposed in the container with a predetermined insertion pressurization value, a preliminary pressurization unit, After the preliminary pressurization, the second press machine is driven at the second pressing position to perform main pressurization in the pressing direction on the battery unit disposed in the container with the insertion pressurization value, a main pressurization unit, An aging pretreatment facility comprising.

[0060] Item 2: At the second pressing position, a spacer insertion device for inserting an insertion spacer into the gap between the main-pressurized battery unit and the container is provided, The control device, An insertion unit that controls the spacer insertion device to insert the insertion spacer into the pressurization gap during the main pressurization between the battery unit and the container according to the length in the pressing direction of the pressurization gap during the measurement pressurization measured by the measurement unit, A release unit that releases the main pressurization on the battery unit by the second press machine after the insertion of the insertion spacer by the insertion unit, The aging pretreatment facility according to item 1, comprising.

[0061] Item 3: The insertion spacer includes a resin spacer made of resin, and a metal spacer made of metal, The aging pretreatment equipment according to item 2, which has the above.

[0062] Item 4: The insertion spacer has a metal spacer made of metal, The insertion part determines the number of the metal spacers to be inserted into the pressure gap between the battery unit and the container according to the length in the pressure direction of the pressure gap measured by the measurement part, and inserts the determined number of the metal spacers into the pressure gap between the battery unit and the container during the main pressurization. The aging pretreatment equipment according to item 2 or 3.

[0063] Item 5: A preparation step of preparing an aging treatment container and a battery unit having a predetermined number of battery cells having a pair of opposing wide surfaces; An arrangement step of arranging the battery cells along a predetermined pressure direction while opposing the wide surfaces, and arranging the battery unit in the container; A measurement pressurization step of performing measurement pressurization on the battery unit arranged in the container in the pressure direction with a predetermined measurement pressurization value at a predetermined first pressurization position; A measurement step of measuring the length in the pressure direction in the pressure gap between the battery unit and the container during the measurement pressurization; After the measurement step, a preliminary pressurization step of performing preliminary pressurization on the battery unit arranged in the container in the pressure direction with a predetermined insertion pressurization value at the first pressurization position; After the preliminary pressurization step, a main pressurization step of performing main pressurization on the battery unit arranged in the container in the pressure direction with the insertion pressurization value at a predetermined second pressurization position; A method for manufacturing a battery unit, including the above steps.

[0064] Item 6: An insertion step of inserting an insertion spacer into the pressurization gap during the main pressurization between the battery unit and the container according to the length in the pressurization direction of the pressurization gap during the measurement pressurization measured in the measurement step; A release step of releasing the main pressurization on the battery unit after the insertion step; The method for manufacturing a battery unit according to claim 5, comprising:

[0065] Item 7: The insertion spacer has a metal spacer made of metal, In the insertion step, according to the length in the pressurization direction of the pressurization gap measured in the measurement step, the number of the metal spacers to be inserted into the pressurization gap between the battery unit and the container is determined, and the determined number of the metal spacers is inserted into the pressurization gap between the battery unit and the container during the main pressurization. The method for manufacturing a battery unit according to claim 6.

Explanation of symbols

[0066] 1 Aging pretreatment facility 5 Battery cell 5a Wide surface 10 Battery unit 20 Container 30A First press 30B Second press 70 Insertion spacer 71 Resin spacer 72 Metal spacer 80 Spacer insertion device 100 Control device 103 Measurement pressurization unit 105 Measurement unit 107 Preliminary pressurization unit 111 Main pressurization unit 113 Insertion unit 115 Release unit D1 First direction (pressurization direction) P1 First pressurization position P2 Second pressurization position S1 Pressing Gap V1 Measured Pressing Value V2 Inserted Pressing Value

Claims

1. An aging treatment container in which a battery unit having a predetermined number of battery cells with a pair of opposing wide surfaces is arranged, a first press machine arranged at a predetermined first pressing position, a second press machine arranged at a predetermined second pressing position, a control device, comprising: The battery unit is arranged in the container so that the battery cells are arranged along a predetermined pressing direction while facing the wide surfaces, The control device, a measurement pressurizing unit that drives the first press machine at the first pressing position to perform measurement pressurization in the pressing direction on the battery unit arranged in the container with a predetermined measurement pressurization value, a measurement unit that measures the length in the pressing direction in the pressurization gap between the battery unit and the container during the measurement pressurization, a preliminary pressurizing unit that drives the first press machine at the first pressing position after measuring the length in the pressing direction in the pressurization gap by the measurement unit to perform preliminary pressurization on the battery unit arranged in the container in the pressing direction with a predetermined insertion pressurization value, a main pressurizing unit that drives the second press machine at the second pressing position after the preliminary pressurization to perform main pressurization on the battery unit arranged in the container in the pressing direction with the insertion pressurization value, An aging pretreatment facility comprising:

2. Comprising a spacer insertion device that inserts an insertion spacer into the gap between the main-pressurized battery unit and the container at the second pressing position, The control device, an insertion unit that controls the spacer insertion device to insert the insertion spacer into the pressurization gap during the main pressurization between the battery unit and the container according to the length in the pressing direction of the pressurization gap during the measurement pressurization measured by the measurement unit, a release unit that releases the main pressurization on the battery unit by the second press machine after the insertion of the insertion spacer by the insertion unit, The aging pretreatment facility according to Claim 1, comprising:

3. The insertion spacer, a resin spacer made of resin, a metal spacer made of metal, The aging pretreatment facility according to Claim 2, having:

4. The insertion spacer has a metal spacer made of metal, The insertion part determines the number of the metal spacers to be inserted into the pressure gap between the battery unit and the container according to the length of the pressure gap in the pressure direction measured by the measurement part, and inserts the determined number of the metal spacers into the pressure gap between the battery unit and the container during the main pressurization. The aging pretreatment facility according to claim 2.

5. A preparation step of preparing a container for aging treatment and a battery unit having a predetermined number of battery cells having a pair of opposed wide surfaces; An arrangement step of arranging the battery cells along a predetermined pressure direction with the wide surfaces opposed to each other and arranging the battery unit in the container; A measurement pressurization step of performing measurement pressurization on the battery unit arranged in the container in the pressure direction at a predetermined measurement pressure value at a predetermined first pressurization position; A measurement step of measuring the length of the pressure gap in the pressure direction in the pressure gap between the battery unit and the container during the measurement pressurization; After the measurement step, a preliminary pressurization step of performing preliminary pressurization on the battery unit arranged in the container in the pressure direction at a predetermined insertion pressure value at the first pressurization position; After the preliminary pressurization step, a main pressurization step of performing main pressurization on the battery unit arranged in the container in the pressure direction at the insertion pressure value at a predetermined second pressurization position; A method for manufacturing a battery unit, including:

6. An insertion step of inserting an insertion spacer into the pressure gap during the main pressurization between the battery unit and the container according to the length of the pressure gap in the pressure direction during the measurement pressurization measured in the measurement step; A release step of releasing the main pressurization on the battery unit after the insertion step; A method for manufacturing a battery unit according to claim 5, including:

7. The insertion spacer has a metal spacer made of metal, In the insertion step, the number of the metal spacers to be inserted into the pressure gap between the battery unit and the container is determined according to the length of the pressure gap in the pressure direction measured in the measurement step, and the determined number of the metal spacers is inserted into the pressure gap between the battery unit and the container during the main pressurization. The method for manufacturing a battery unit according to claim 6.

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