Battery sealing method

Abstract

To provide a method for sealing a battery that is capable of sealing a liquid filling hole of a liquid filling frame by utilizing a heating device while restraining deformation of the liquid filling frame.SOLUTION: A battery sealing method includes a liquid injection step of injecting an electrolyte into an internal space and a liquid injection hole through liquid injection holes 27, 28 that are provided on an end face 25C of a resin liquid injection frame 25 provided on the outer peripheral portion of a laminate 15 having a plurality of electrodes and communicates with the internal space of the laminate, a drilling step of providing an exhaust hole 26 that penetrates through the liquid injection frame along a stacking direction LD of the electrodes and communicates with the liquid injection holes, and a sealing step of moving a heating device 50 to an end portion on the laminate side of the exhaust hole or from the end portion to the laminate side while bringing the heating device 50 into contact with the resin member covering the end faces of the liquid injection holes, and sealing the end portions of the liquid injection holes opposite to the internal space with a molten resin member.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for sealing a battery.

Background Art

[0002] The bipolar battery of Patent Document 1 below has a laminate including a negative terminal electrode, a bipolar electrode, a positive terminal electrode, and a separator, and a resin sealing portion provided on the outer peripheral portion of the laminate. A liquid injection hole communicating with the internal space of the laminate is provided in the end face of this sealing portion. Through this liquid injection hole, an electrolytic solution can be injected into the internal space.

[0003] In such a bipolar battery, it is possible to heat a film-shaped resin member by a heating device and seal the end of the liquid injection hole with a part of the melted resin member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When heating a resin member by a heating device, heat may be transferred from the liquid injection frame to which the resin member is welded to the electrolytic solution, and the electrolytic solution may generate gas. Furthermore, this gas may exert pressure on the liquid injection frame, and there is a risk that the liquid injection frame may be deformed by this pressure.

[0006] In consideration of the above facts, an object of the present invention is to obtain a method for sealing a battery that can seal the liquid injection hole of the liquid injection frame using a heating device while suppressing deformation of the liquid injection frame.

Means for Solving the Problems

[0007] The battery sealing method of the first aspect includes a liquid injection step of injecting an electrolytic solution into the internal space and the liquid injection hole through a liquid injection hole provided on an end surface of a resin-made liquid injection frame provided on an outer peripheral portion of a laminate having a plurality of electrodes and communicating with the internal space of the laminate, a drilling step of providing an exhaust hole that penetrates the liquid injection frame along the stacking direction of the electrodes and communicates with the liquid injection hole, and a sealing step of moving an end portion of the exhaust hole on the laminate side or up to the laminate side from the end portion while bringing a heating device into contact with a resin-made member covering the end surface of the liquid injection hole, and sealing an end portion of the liquid injection hole on the side opposite to the internal space with the melted resin-made member.

[0008] The battery sealing method of the first aspect seals an end portion of the liquid injection hole on the side opposite to the internal space with the melted resin-made member by moving an end portion of the exhaust hole on the laminate side or up to the laminate side from the end portion while bringing a heating device into contact with a resin-made member.

[0009] When the resin-made member is heated by the heating device, this heat may be transmitted from the liquid injection frame to the electrolytic solution in the liquid injection hole, and the electrolytic solution may generate gas. However, this gas is discharged to the outside of the liquid injection frame through the exhaust hole. Therefore, the pressure due to the gas in the liquid injection hole becomes high, and the possibility that the liquid injection frame is deformed due to this pressure is small.

[0010] The battery sealing method of the second aspect is, in the first aspect, the sealing step is a step of moving the heating device from the end portion on the laminate side of the exhaust hole to the laminate side while bringing the heating device into contact with the resin-made member.

[0011] According to the battery sealing method of the second aspect, an end portion of the liquid injection hole on the side opposite to the internal space can be reliably sealed with the melted resin-made member.

Advantages of the Invention

[0012] As described above, the battery sealing method according to the present invention has an excellent effect that the liquid injection hole of the liquid injection frame can be sealed using a heating device while suppressing deformation of the liquid injection frame.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0014] FIG. 1 shows a battery (bipolar type battery) 10 manufactured by applying a battery sealing method (hereinafter referred to as a sealing method) according to an embodiment. The battery 10 can be mounted on various devices. For example, the battery 10 can be mounted on a battery electric vehicle (BEV) and supply power to an electric motor which is a drive source. Note that the arrows UP, FR, and LH shown in each drawing indicate the upper side in the vertical direction, the front side in the front-rear direction, and the left side in the left-right direction, respectively.

[0015] Before explaining the sealing method, the basic configuration of the battery 10 will be described with reference to FIGS. 1 and 2. The battery 10 of this embodiment includes a laminate 15, a resin structure 20, and a cover member (resin member) 30.

[0016] The laminate 15 includes six battery cells 12 laminated in the vertical direction. Since the configuration of the laminate 15 is well-known, the following description of the laminate 15 will be simplified. For example, the laminate 15 has the same configuration as the laminate disclosed in JP-A-2023-110291. The laminate 15 includes one negative terminal electrode (electrode), one positive terminal electrode (electrode), five bipolar electrodes (electrodes) located between the negative terminal electrode and the positive terminal electrode, and six separators located between the adjacent positive terminal electrode, negative terminal electrode, and bipolar electrodes. The negative terminal electrode includes a current collector and a negative active material layer provided on one surface of the current collector. The positive terminal electrode includes a current collector and a positive active material layer provided on one surface of the current collector. Each bipolar electrode includes a current collector and a negative active material layer and a positive active material layer provided on both surfaces of the current collector, respectively. The laminate 15 is configured by laminating the negative terminal electrode, the positive terminal electrode, the five bipolar electrodes, and the six separators in the lamination direction LD. In FIGS. 1 and 2, the lamination direction LD is parallel to the vertical direction. The planar shapes of the negative terminal electrode, the positive terminal electrode, the bipolar electrode, and the separator of this embodiment are rectangular. Therefore, as shown in FIG. 2, the planar shape of the laminate 15 is rectangular. Each separator, and the negative active material layer and the positive active material layer located above and below the separator, are components of the battery cell 12.

[0017] On the outer peripheral portion of the laminate 15, a frame-shaped resin component 22, which is a part of the resin component 20, is provided. The frame-shaped resin component 22 is integrated with the outer peripheral portion of the laminate 15 in an airtight and liquidtight state so as to cover the outer peripheral portion of the laminate 15. Further, six slits 23 are provided on the front end surface of the frame-shaped resin component 22. More specifically, as shown in FIG. 2, three slits 23 on the left side arranged vertically and three slits 23 on the right side arranged vertically are provided on the front end surface of the frame-shaped resin component 22. Further, the uppermost slit 23 on the right side is located below the uppermost slit 23 on the left side, and the uppermost slit 23 on the left side communicates with the front end portion of the internal space of the uppermost battery cell 12 in an airtight and liquidtight state (see FIG. 3), and the uppermost slit 23 on the right side communicates with the front end portion of the internal space of the second battery cell 12 from the top in an airtight and liquidtight state. Also, the middle slit 23 on the right side is located below the middle slit 23 on the left side in the vertical direction, and the middle slit 23 on the left side communicates with the front end portion of the internal space of the third battery cell 12 from the top in an airtight and liquidtight state (see FIG. 3), and the middle slit 23 on the right side communicates with the front end portion of the internal space of the fourth battery cell 12 from the top in an airtight and liquidtight state. Also, the lowermost slit 23 on the right side is located below the lowermost slit 23 on the left side, and the lowermost slit 23 on the left side communicates with the front end portion of the internal space of the fifth battery cell 12 from the top in an airtight and liquidtight state (see FIG. 3), and the lowermost slit 23 on the right side communicates with the front end portion of the internal space of the lowermost battery cell 12 in an airtight and liquidtight state.

[0018] On the front end face of the frame-shaped resin component 22, a liquid injection frame 25, which is a part of the resin component 20, is provided in a manner covering the front end portions of the respective slits 23. As shown in FIGS. 1 and 2, the liquid injection frame 25 has a substantially rectangular parallelepiped shape. Further, as shown in FIGS. 5 to 7, on the front end face 25C on the front side of the liquid injection frame 25, six outer liquid injection holes (liquid injection holes) 27 extending rearward inside the liquid injection frame 25 and six inner liquid injection holes (liquid injection holes) 28 extending from the rear ends of the respective outer liquid injection holes 27 to the rear end of the liquid injection frame 25 are provided. The cross-section of the outer liquid injection hole 27 orthogonal to the front-rear direction is larger than the cross-section of the inner liquid injection hole 28 orthogonal to the front-rear direction. More specifically, as shown in FIG. 2, three outer liquid injection holes 27 and inner liquid injection holes 28 arranged vertically on the left side and three outer liquid injection holes 27 and inner liquid injection holes 28 arranged vertically on the right side are provided in the liquid injection frame 25. Further, the uppermost outer liquid injection hole 27 and inner liquid injection hole 28 on the right side are located below the uppermost outer liquid injection hole 27 and inner liquid injection hole 28 on the left side, the middle outer liquid injection hole 27 and inner liquid injection hole 28 on the right side are located below the middle outer liquid injection hole 27 and inner liquid injection hole 28 in the vertical direction on the left side, and the lowermost outer liquid injection hole 27 and inner liquid injection hole 28 on the right side are located below the lowermost outer liquid injection hole 27 and inner liquid injection hole 28 on the left side. Further, the rear end portions of the respective inner liquid injection holes 28 are in airtight and liquidtight communication with the front end portions of the corresponding respective slits 23, respectively.

[0019] The frame-shaped resin component 22 and the liquid injection frame 25 are made of an insulating resin material. The constituent materials of the frame-shaped resin component 22 and the liquid injection frame 25 are, for example, polypropylene, polyethylene, polystyrene, ABS resin, acid-modified polypropylene, acid-modified polyethylene, or acrylonitrile styrene resin.

[0020] The frame-shaped resin component 22 and the liquid injection frame 25 may be manufactured in different manufacturing processes or may be manufactured in one manufacturing process. For example, a manufacturing process of providing the frame-shaped resin component 22 on the outer peripheral portion of the laminate 15 by insert molding and a manufacturing process of providing the liquid injection frame 25 at the front end portion of the frame-shaped resin component 22 integrated with the laminate 15 by insert molding may be executed to manufacture an integrated product of the laminate 15 and the resin component 20.

[0021] Into the internal space of each battery cell 12, each slit 23, each outer liquid injection hole 27, and each inner liquid injection hole 28, an electrolytic solution (not shown) is injected from the front end of each outer liquid injection hole 27.

[0022] Next, the sealing method of this embodiment will be described with reference to FIGS. 3 to 8. As shown in FIG. 8, the sealing method of this embodiment includes a liquid injection step, a loading step, a coating step, a calculation step, a perforation step, a depressurization step, a sealing step, a sealing end step, and a depressurization end step. By repeatedly executing these steps, a plurality of batteries 10 are manufactured.

[0023] The sealing method of this embodiment is executed while using a vacuum sealing device 40. As shown in FIG. 5, the vacuum sealing device 40 includes a chamber 41, a support base 45, a pipe 47, a suction device 48, a heating device 50, a control device 60, and an input device 61.

[0024] The chamber 41 is a rectangular parallelepiped box-shaped member. A through hole (not shown) is formed in the upper part of the chamber 41. Further, the chamber 41 includes a lid member (not shown) that detachably closes the through hole in an airtight state. A first hole 43 and a second hole 44 are provided side by side vertically on the front wall 42 of the chamber 41. Further, a support base 45 is fixed to the bottom surface of the internal space of the chamber 41. The support surface 46, which is the upper surface of the support base 45, is inclined with respect to the horizontal plane.

[0025] A pipe 47 is inserted into the first hole 43 of the front wall 42. An airtight state is maintained between the inner peripheral surface of the first hole 43 and the outer peripheral surface of the pipe 47. A suction device 48 is connected to the front end of the pipe 47.

[0026] A heating device 50 is connected to the second hole 44 in the front wall 42. The heating device 50 includes a slider 51, a heating unit 52, and an actuator (not shown). The slider 51 is slidably inserted into the second hole 44. An airtight state is maintained between the inner peripheral surface of the second hole 44 and the outer peripheral surface of the slider 51. In a side view, the slider 51 is inclined with respect to the horizontal direction. The slider 51 is slidable with respect to the front wall 42 in the extension direction of the slider 51 (the direction of arrow DR in FIGS. 5 to 7). An actuator is connected to the slider 51. By the driving force generated by the actuator, the slider 51 is slidable between the initial position shown in FIG. 5 and the maximum pushing position (not shown) behind the position shown in FIG. 5. A heating unit 52 is fixed to the rear end portion of the slider 51. A heating surface 53, which is the rear surface of the heating unit 52, is constituted by a flat surface. Further, inside the heating unit 52, a heat generating unit (not shown) for heating the heating unit 52 (heating surface 53) is provided. The heat generating unit is, for example, a heating wire that generates heat when an electric current flows through it.

[0027] The control device 60 shown in FIG. 5 includes a CPU (Central Processing Unit) (processor), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage, a communication I / F, and an input / output I / F. The CPU, ROM, RAM, storage, communication I / F, and input / output I / F are communicably connected to each other via an internal bus.

[0028] The CPU is the central processing unit that executes various programs and controls each part. The CPU reads a program from the ROM or storage and executes the program using the RAM as a working area. The CPU performs control of each component and various arithmetic operations according to the program recorded in the ROM or storage. The ROM stores various programs and various data. The RAM temporarily stores a program or data as a working area. The storage is composed of a storage device such as an HDD or SSD and stores various programs and various data. The communication I / F is an interface for communicating with a control device different from the control device 60. The input / output I / F is an interface for communicating with various devices. For example, the suction device 48, the actuator, the heating unit, and the input device 61 are connected to the input / output I / F.

[0029] The control device 60 has, as a functional configuration, a positional relationship calculation unit, a punching device control unit, a suction control unit, and a heating control unit. The positional relationship calculation unit, the punching device control unit, the suction control unit, and the heating control unit are realized by the CPU reading and executing the program stored in the ROM.

[0030] The positional relationship calculation unit calculates the positional relationship between the heating surface 53 of the heating unit 52 when the slider 51 is in the initial position and the integrated body of the laminate 15 and the resin structure 20 fixed to the support base 45. More specifically, the positional relationship calculation unit calculates the positional relationship between the heating surface 53 and the integrated body in a side view and the positional relationship between the heating surface 53 and the integrated body in a plan view.

[0031] Figure 3 shows the positional relationship between the heating surface 53 of the heating unit 52 and the integrated body of the laminate 15 and the resin structure 20 in a side view when the integrated body is fixed to the support base 45 and the slider 51 is in the initial position. At this time, in the side view, the heating surface 53 of the heating unit 52 is substantially parallel to the lamination direction LD. The upper edge portion 25C2 is positioned forward of the lower edge portion 25C1 of the end face 25C. That is, the end face 25C of the liquid injection frame 25 is inclined at an angle α with respect to the lamination direction LD (heating surface 53). Here, in the side view, the direction orthogonal to the lamination direction LD is defined as the orthogonal direction PD. In the side view, the orthogonal direction PD is parallel to the slide direction DR. In this case, the distance in the orthogonal direction PD between the lower edge portion 25C1 and the upper edge portion 25C2 is L1.

[0032] Figure 4 shows the positional relationship between the heating surface 53 of the heating unit 52 and the liquid injection frame 25 in a plan view when the integrated body is fixed to the support base 45 and the slider 51 is in the initial position. At this time, in the plan view, the left end portion 25C1B of the lower edge portion 25C1 of the liquid injection frame 25 is positioned rearward of the right end portion 25C1A. In the plan view, the right end portion 25C2A of the upper edge portion 25C2 of the liquid injection frame 25 is positioned forward of the left end portion 25C2B. The distance L2 in the orthogonal direction PD between the left end portion 25C1B of the end face 25C of the integrated body fixed to the support base 45 and the heating surface 53 is known.

[0033] The angle α, the angle β of the support surface 46 with respect to the horizontal direction in the side view (see FIG. 3), the distance L1, the distance HL in the orthogonal direction PD between the right end portion 25C2A of the upper edge portion 25C2 of the end surface 25C of the integrated object fixed to the support base 45 and the heating surface 53 (see FIGS. 3 and 4), and the distance L2 are known. That is, even if the integrated object is not actually fixed to the support base 45, information regarding the angle α, the angle β, the distance L1, the distance HL, and the distance L2 can be obtained. Therefore, when information regarding the angle α, the angle β, the distance L1, the distance HL, and the distance L2 is input to the control device 60 using the input device 61 (see FIG. 5) connected to the control device 60, the positional relationship calculation unit sets, based on these pieces of information, the position in the liquid injection frame 25 that is separated from the heating surface 53 by a distance L3 along the orthogonal direction PD to the rear as the movement stop position PE (see FIGS. 3 and 4). The movement stop position PE is a position behind the left end portion 25C1B of the lower edge portion 25C1.

[0034] The punching device control unit controls a punching device (not shown). This punching device can form a plurality of exhaust holes 26 that penetrate the liquid injection frame 25 of the integrated object located outside the vacuum sealing device 40 in a direction parallel to the stacking direction LD. The punching device control unit forms the exhaust holes 26 in the liquid injection frame 25 based on the information regarding the movement stop position PE calculated by the positional relationship calculation unit. As shown in FIGS. 3 and 4, the exhaust holes 26 are formed between the end surface 25C and the movement stop position PE. That is, the movement stop position PE is located behind the rear end portion of the most rearward exhaust hole 26. In the present embodiment as shown in FIG. 4, the plurality of exhaust holes 26 are formed in the liquid injection frame 25 so as to be arranged substantially in the left - right direction. As shown in FIG. 3, each exhaust hole 26 communicates with the outer liquid injection hole 27 of the liquid injection frame 25. As shown in FIG. 4, the exhaust holes 26 are formed only in the right half portion of the liquid injection frame 25. That is, the exhaust holes 26 communicate with the three outer liquid injection holes 27 on the right side.

[0035] The suction control unit controls the suction device 48. The heating control unit controls the heating device 50.

[0036] (Operation and Effect) Next, the operation and effect of the present embodiment will be described.

[0037] When implementing the sealing method using the vacuum sealing device 40, first, as shown in FIG. 8, the liquid injection process is carried out. That is, the electrolytic solution is injected into the internal space of each battery cell 12, each slit 23, each inner liquid injection hole 28, and each outer liquid injection hole 27 through the front end portion of each outer liquid injection hole 27.

[0038] Subsequently, the loading process is carried out. That is, the integrated object is inserted into the internal space of the chamber 41 through the through hole of the chamber 41 in a state where the lid member is removed. As shown in FIG. 5, the injection frame 25 supports the lower surface of the integrated object on the support surface 46 of the support base 45 in a manner facing the heating unit 52 in the front-rear direction, and the integrated object and the support base 45 are fixed. Thereby, the front end portion of the integrated object is located above the rear end portion. At this time, the heating unit 52 is located at the initial position.

[0039] Subsequently, the covering process is carried out. That is, a film-like and resin-made cover member 30 is placed on the end surface 25C of the injection frame 25 so as to cover each outer liquid injection hole 27 (see FIG. 5. Not shown in FIGS. 6 and 7). Further, using the temporary fixing tape 60 having adhesiveness (see FIG. 2), a plurality of locations of the cover member 30 are temporarily fixed to the injection frame 25.

[0040] Subsequently, the calculation process is carried out. That is, as described above, the positional relationship calculation unit calculates the movement stop position PE.

[0041] Subsequently, the perforation process is carried out. That is, as described above, the exhaust hole 26 is formed in the injection frame 25 using the perforation device.

[0042] Subsequently, a depressurization process is carried out. That is, the lid member is placed airtightly over the through hole of the chamber 41, and after covering, the suction device 48 is operated. For example, the suction device 48 is operated until the pressure inside the chamber 41 reaches -90 KPa. As a result, a part of the gas inside the integrated object (for example, at least one of the internal space of the battery cell 12, the inner liquid injection hole 28, and the outer liquid injection hole 27) is sucked by the suction device 48 through the gap between the portion where the temporary fixing tape 60 of the cover member 30 is not provided and the liquid injection frame 25 and each outer liquid injection hole 27. That is, the depressurization process of the inside of the integrated object is executed.

[0043] Subsequently, a sealing process is carried out. That is, as shown in FIG. 6, the heating part 52 of the heating device 50 heated to a predetermined temperature (for example, 140 ° C) is moved backward from the initial position by using an actuator, and the heating surface 53 is brought into contact with the cover member 30 (not shown in FIG. 6). Therefore, due to the heat applied to the liquid injection frame 25 from the heating surface 53 through the cover member 30, the front parts of the cover member 30 and the liquid injection frame 25 are melted, and the front part of the liquid injection frame 25 and the cover member 30 are welded together.

[0044] Furthermore, as shown in FIG. 7, while melting the front part of the liquid injection frame 25, the heating part 52 is moved to the target pushing position. The target pushing position is the same position as the maximum pushing position or a position in front of the maximum pushing position. At this time, the heating surface 53 is located at the movement stop position PE. Therefore, while the heating part 52 moves to the target pushing position, each exhaust hole 26 disappears when a part of the liquid injection frame 25 melts. Furthermore, before each exhaust hole 26 disappears, the gas generated from the electrolyte of the outer liquid injection hole 27 and the inner liquid injection hole 28 is discharged to the outside of the liquid injection frame 25 through each exhaust hole 26. Furthermore, the front end part of each outer liquid injection hole 27 is sealed by a part of the melted liquid injection frame 25.

[0045] Subsequently, a sealing end process is carried out. That is, after the heating part 52 is stopped at the target pushing position for a predetermined time, the heating part 52 is returned to the initial position.

[0046] Subsequently, a decompression completion process is performed. After the temperature of the heating unit 52 (the temperature of the liquid injection frame 25) drops below the melting temperature of the liquid injection frame 25, the suction device 48 is stopped. As a result, the internal space of the chamber 41 communicates with the external space of the chamber 41 via the pipe 47 and the suction device 48. That is, the air pressure in the internal space of the chamber 41 becomes equal to the air pressure in the external space of the chamber 41.

[0047] After this, the operator can remove the lid member from the chamber 41 and then take out the completed battery 10 through the opening of the chamber 41 to the outside of the chamber 41.

[0048] As described above, in the sealing method of this embodiment, while the heating unit 52 of the heating device 50 is in contact with the cover member 30, it is moved from the rear end portion (the end portion on the laminate 15 side) of the exhaust hole 26 to the rear (the laminate 15 side) until the front end portion of the outer liquid injection hole 27 is sealed by the cover member 30.

[0049] When the heating device 50 heats the liquid injection frame 25, this heat may be transmitted to the electrolytic solution in the outer liquid injection hole 27 and the inner liquid injection hole 28 of the liquid injection frame 25, and the electrolytic solution may generate gas. However, this gas is discharged to the outside of the liquid injection frame 25 through the exhaust hole 26. Therefore, the pressure due to the gas in the outer liquid injection hole 27 and the inner liquid injection hole 28 becomes high, and the possibility of the liquid injection frame 25 being deformed due to this pressure is small.

[0050] Note that the exhaust holes 26 are formed only in the right half of the liquid injection frame 25 as described above. As is clear from FIGS. 4 to 7, the distance between the end face 25C in the right half of the liquid injection frame 25 and the movement stop position PE is longer than the distance between the end face 25C in the left half of the liquid injection frame 25 and the movement stop position PE. That is, while the gas pressure in each of the three outer liquid injection holes 27 and each of the inner liquid injection holes 28 arranged vertically in the right half of the liquid injection frame 25 tends to be high while the heating part 52 moves to the target pushing position, the gas pressure in each of the three outer liquid injection holes 27 and each of the inner liquid injection holes 28 arranged vertically in the left half of the liquid injection frame 25 is unlikely to be high. Therefore, although the exhaust holes 26 are not provided in the left half of the liquid injection frame 25, the possibility that the left half of the liquid injection frame 25 is deformed by the gas pressure is small.

[0051] Furthermore, the movement stop position PE is located behind the rear end of the rearmost exhaust hole 26. Therefore, by moving the heating part 52 to the target pushing position, the front end parts of the respective outer liquid injection holes 27 can be surely sealed.

[0052] As described above, the battery sealing method according to the embodiment has been described, but these can be appropriately designed and changed within the scope not departing from the gist of the present invention.

[0053] For example, the calculation method for determining the movement stop position PE in the liquid injection frame 25 may be a method different from the above. In any case of using any calculation method, the movement stop position PE is determined such that the position of the heating surface 53 when the heating part 52 moves to the target pushing position is the same as the position of the rear end of the rearmost exhaust hole 26 or is located behind the rear end of the rearmost exhaust hole 26.

[0054] The battery sealing method may not include a decompression step.

[0055] The battery cell 12 may include a plurality of electrodes and separators that do not include bipolar electrodes. That is, the battery 10 may be a battery of a type different from the bipolar type battery.

[0056] The number of battery cells 12 that make up the battery 10 may be a plurality other than six or one.

[0057] The cross-sectional shape of the liquid injection hole provided in the liquid injection frame 25 may be constant throughout the front-rear direction (the longitudinal direction of the liquid injection hole).

[0058] The shape of the resin component 20 may be different from the above shape.

[0059] The number of exhaust holes 26 provided in the liquid injection frame 25 by the punching device may be one. Also, the punching device may provide one or a plurality of exhaust holes 26 over substantially the entire left-right direction of the liquid injection frame 25.

Explanation of Reference Numerals

[0060] 10 Battery 12 Battery Cell 15 Laminate 25 Liquid Injection Frame 25C End Face 26 Exhaust Hole 27 Outer Liquid Injection Hole (Liquid Injection Hole) 28 Inner Liquid Injection Hole (Liquid Injection Hole) 30 Cover Member (Resin Member) 50 Heating Device LD Laminating Direction

Claims

1. A liquid injection step of injecting an electrolytic solution into the internal space and the liquid injection hole through a liquid injection hole provided on an end face of a resin liquid injection frame provided on an outer peripheral portion of a laminate having a plurality of electrodes and communicating with the internal space of the laminate, A drilling step of providing a vent hole that penetrates the liquid injection frame along the stacking direction of the electrodes and communicates with the liquid injection hole, and A sealing step of moving an end portion on the laminate side of the vent hole or up to the laminate side from the end portion while bringing a heating device into contact with a resin member covering the end face of the liquid injection hole, and sealing an end portion on the side opposite to the internal space of the liquid injection hole with the melted resin member, A method for sealing a battery having the above steps.

2. The sealing step is The method for sealing a battery according to claim 1, which is a step of moving the heating device from the end portion on the laminate side of the vent hole to the laminate side while bringing the heating device into contact with the resin member.

Images