JP7100802B2 - Battery manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a battery.

In recent years, batteries such as lithium-ion batteries have been suitably used for portable power sources such as personal computers and mobile terminals, and vehicle drive power sources for electric vehicles (EV), hybrid vehicles (HV), plug-in hybrid vehicles (PHV) and the like. Has been done.

Such a battery generally has a structure in which an electrode body in which positive and negative electrodes are laminated and a non-aqueous electrolyte are housed in a battery case and airtightly sealed. It is assembled according to the procedure of. That is, first, the electrode body is housed in a metal case body, the case body is covered with a lid member, and then the lid member and the case body are joined by laser welding. After that, the non-aqueous electrolytic solution is injected into the battery case from the liquid injection hole provided in the lid member, and the liquid injection hole is sealed by laser welding the liquid injection plug to the unnecessary liquid injection hole (). For example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-178053

By the way, with respect to this type of battery, it has become clear that a metallic foreign substance that causes a minute short circuit can enter the battery case in the sealing (fitting) process and the welding process of the battery case. Therefore, a method has been proposed in which the battery case is sealed upside down. That is, the opening of the case body is arranged below, the electrode body is inserted into the case body from below, the lid member is fitted from below, and then the lid member and the case body are welded by irradiating the laser from below. It is a method. Although the occurrence of micro short circuits due to the mixing of metal foreign substances is reduced by this method, further improvement is required for the occurrence of micro short circuits.

Therefore, an object of the present invention is to provide a method for manufacturing a battery capable of further reducing the mixing of metal foreign substances.

According to the diligent study of the present inventor, even when the battery case is sealed upside down, extremely fine metal powder is generated due to the rubbing between the case body and the lid member, and this metal powder is short-circuited. It was found that it can be the cause of. As shown in FIG. 5, for example, this metal powder may remain inside the battery case as it is even if the lid member is fitted to the case body from below. Further, this metal powder may invade, for example, the positive electrode and its vicinity in the electrode together with the electrolytic solution to be injected later. Therefore, the method for manufacturing a battery disclosed here is a process of preparing a case body having an opening, a lid member having a through hole that seals the opening and penetrating in the thickness direction, and an electrode body, and a case of the electrode body. It includes a step of accommodating the case in the main body and a step of fitting the lid member into the opening of the case main body. The fitting step is a tubular blower nozzle, which uses a blower nozzle in which the tip portion in the tubular axis direction is sealed and a nozzle hole is provided in the direction intersecting the tubular axis direction, and the lid member is used. Insert the blower nozzle into the through hole of the above, and fit the case body and the lid member while blowing air from the blower nozzle into the inside of the case body, and at the timing when the case body and the lid member fit together. It is characterized by stopping the blowing from the blowing nozzle.

According to such a method, in the step of fitting the lid member into the opening of the case main body, an air flow from the inside of the case to the outside is formed in the gap between the case main body and the lid member. As a result, the friction between the case body and the lid member is alleviated, and the generation of metal powder (metal foreign matter) itself is reduced. Further, even if metal powder is inevitably generated due to rubbing between the case body and the lid member, the generated metal powder is immediately sent to the outside of the case on the air flow. As a result, it is possible to suppress the mixing of metal powder into the case. As a result, it is possible to suppress the occurrence of minute short circuits caused by this metal powder. The path of the nozzle hole of the blower nozzle is appropriately adjusted. This makes it possible to suitably generate an air flow from the inside of the case to the outside by blowing air. As a result, the metal powder can be effectively discharged to the outside of the case without being sent to the inside of the case by blowing air.

It is a partial cut-out perspective view which illustrates the battery manufactured by the manufacturing method which concerns on one Embodiment. It is sectional drawing which schematically explains steps S1 to S4 of the manufacturing method of the battery which concerns on one Embodiment. It is a perspective flow diagram schematically explaining steps S1 to S4 of the battery manufacturing method which concerns on one Embodiment. (A) and (b) are sectional views explaining the fitting process which concerns on one Embodiment. It is sectional drawing explaining the fitting process of the conventional invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. It should be noted that matters other than those specifically mentioned in the present specification and necessary for carrying out the present invention (for example, battery configurations and manufacturing processes that do not characterize the present invention) are conventionally described in the art. It can be grasped as a design matter of a person skilled in the art based on technology. The present invention can be carried out based on the contents disclosed in the present specification and the common general technical knowledge in the art. Further, in the following drawings, members / parts having the same action are described with the same reference numerals. Further, the dimensional relations (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relations.

In addition, the term "battery" in this specification is not limited to a primary battery and a secondary battery. However, it is preferable that the secondary battery is premised on long-term use by repeatedly charging and discharging. Further, the "secondary battery" in this case generally refers to a power storage device capable of being repeatedly charged and discharged, and is a term including a so-called storage battery and a power storage element such as an electric double layer capacitor.
Further, the term "lithium ion battery" as used herein refers to a secondary battery that uses lithium ions as a charge carrier and realizes charging and discharging with the movement of lithium ions between the positive and negative electrodes.

The method for manufacturing a battery according to the present embodiment includes the following steps S1 to S3 as a part thereof. Typically, these steps are followed by the following step S4.
(S1) A step of preparing a case body having an opening, a lid member having a through hole that seals the opening and penetrating in the thickness direction, and an electrode body (S2) A step of accommodating the electrode body in the case body (S3). Step of fitting the lid member into the opening of the case body (S4) Process of welding the lid member and the case body FIG. 1 is a lithium ion battery 1 as an example of a battery. 2 and 3 are process diagrams for explaining the manufacturing method of the battery 1 according to the embodiment. In the figure, reference numeral H indicates the height direction of the lithium ion battery 1, and reference numerals U and D indicate upper and lower, respectively. Further, the reference numeral W in the figure indicates the width direction of the lithium ion battery 1. Hereinafter, each step of the method for manufacturing the lithium ion battery 1 will be described together with the components of the battery.

1. 1. Preparation step In step S1, the battery case 10 and the electrode body 20 necessary for assembling the battery 1 are prepared.
The battery case 10 includes a case main body 11 having an opening 11a on one surface, and a lid member 12 for sealing the opening 11a of the case main body 11. Although not necessarily limited to this, it is preferable that the battery case 10 is made of metal because the effect of the present invention is remarkably exhibited. Suitable examples of the metal constituting the battery case 10 include iron, copper, aluminum, titanium, and an alloy containing these (for example, steel). The case body 11 of this example has a flat bottomed square tube shape. In recent years, the lid member 12 has been designed so that the gap (play) with the battery case 10 becomes almost zero in order to improve the quality of welding for the sealing (sealing can) in the subsequent process. Further, the lid member 12 includes a through hole 15, a safety valve 18, a positive electrode external terminal 30, and a negative electrode external terminal 40. The through hole 15 penetrates the lid member 12 in the thickness direction. The through hole 15 also serves as an injection hole for an electrolytic solution, which will be described later. In the completed lithium-ion battery 1 shown in FIG. 1, the through hole 15 is sealed by a liquid injection plug 16 described later. The safety valve 18 is a pressure release valve for releasing the internal pressure of the battery case 10 to the outside when the internal pressure of the battery case 10 after sealing rises to a predetermined pressure. The positive electrode external terminal 30 and the negative electrode external terminal 40 are provided one by one at the end of the battery case 10 in the width direction W so as to project to the outside of the case. The positive electrode external terminal 30 and the negative electrode external terminal 40 are used for charging and extracting electric charges from the battery 1 (electrode body 20).

The electrode body 20 of this example includes a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are laminated and wound in a state of being insulated from each other by a separator to form an electrode body 20.
The positive electrode includes a positive electrode current collector and a porous positive electrode active material layer formed on the surface thereof. For the positive electrode current collector, for example, a metal foil such as an aluminum foil is preferably used. In this example, positive electrode active material layers are provided on both sides of the positive electrode current collector. Further, in the width direction W, the positive electrode active material layer is formed to be narrow so that the positive electrode current collector on the side of the positive electrode external terminal 30 is exposed. The positive electrode active material layer contains granular positive electrode active material. As the positive electrode active material, one or more of the substances conventionally used as the positive electrode active material in the lithium ion battery can be used without particular limitation. Examples include lithium nickel cobalt manganese composite oxides (eg LiNi _1/3 Co _1/3 Mn _1/3 O ₂ etc.), lithium nickel composite oxides (eg LiNiO ₂ etc.), lithium cobalt composite oxides. Examples include lithium transition metal composite oxides such as (eg, LiCoO ₂ etc.) and lithium nickel manganese composite oxides (eg LiNi _0.5 Mn _1.5 O ₄ etc.). In addition to the above-mentioned positive electrode active material, the positive electrode active material layer may contain a conductive material such as acetylene black (AB) and a binder such as polyvinylidene fluoride (PVDF) and styrene butadiene rubber (SBR).

The negative electrode includes a negative electrode current collector and a porous negative electrode active material layer formed on the surface thereof. For the negative electrode current collector, for example, a metal foil such as a copper foil is preferably used. In this example, the negative electrode active material layer is provided on both sides of the negative electrode current collector. Further, in the width direction W, the negative electrode active material layer is formed to be narrow so that the negative electrode current collector on the negative electrode external terminal 40 side is exposed. The negative electrode active material layer contains a negative electrode active material. As the negative electrode active material, one kind or two or more kinds of substances conventionally used as a negative electrode active material in a lithium ion battery can be used without particular limitation. Examples thereof include carbon-based materials such as graphite carbon and amorphous carbon, silicon, lithium transition metal oxides, and lithium transition metal nitrides. In addition to the above-mentioned negative electrode active material, the negative electrode active material layer may contain a binder such as polyvinylidene fluoride (PVDF) and styrene butadiene rubber (SBR), and a thickener such as carboxymethyl cellulose (CMC).

The separator is a porous member that electrically insulates the positive electrode and the negative electrode. In this example, the separator is composed of a microporous sheet having a plurality of micropores. As the separator, for example, a single-layer structure separator made of a porous polyolefin resin or a multi-layer structure separator can be used. The separator may be provided with a heat resistant layer (HRL).

These positive electrodes and negative electrodes can be manufactured according to a known method. For example, a paste containing the constituents of each active material layer is prepared and applied onto a band-shaped current collector. At this time, the paste is not applied to the widthwise ends of the positive electrode and the negative electrode current collectors, and exposed portions of the current collectors are provided. The positive electrode and the negative electrode thus produced are laminated via two strip-shaped separators one by one. At this time, the overlapping positions of the positive electrode, the negative electrode, and the separator are adjusted so that the exposed portion of the positive electrode current collector and the exposed portion of the negative electrode current collector protrude in different directions in the width direction. The wound electrode body 20 can be obtained by winding the positive electrode, the negative electrode, and the separator laminated in this way so that the winding axis is in the width direction and the cross section is oval.

2. 2. Electrode body accommodating step In step S2, the electrode body 20 is accommodated in the case body 11. In a preferred embodiment, the electrode body 20 is housed in the case body 11 in a state of being fixed to the lid member 12 in advance. Specifically, first, the positive electrode current collecting terminal 32 and the negative electrode current collecting terminal 42 are attached to the inner surface of the case of the lid member 12, respectively. At this time, the positive and negative external terminals 30 and 40 provided on the outer surface of the case of the lid member 12 and the positive and negative current collecting terminals 32 and 42 are electrically connected. Then, the positive electrode current collector terminal 32 and the negative electrode current collector terminal 42 are connected to the exposed portion of the positive electrode collector and the exposed portion of the negative electrode collector that protrude at the end portion in the width direction of the electrode body 20. The current collector terminals 32 and 42 and the exposed portion of the current collector can be electrically and mechanically connected, for example, by ultrasonic welding. As a result, the electrode body 20 can be firmly supported by the lid member 12 via the positive electrode current collecting terminal 32 and the negative electrode current collecting terminal 42. Further, by this, the position of the electrode body 20 in the battery case 10 can be suitably maintained in the assembled battery 1. As a result, the width direction of the electrode body 20 and the width direction W of the lithium ion battery 1 coincide with each other.

Next, for example, the lid member 12 to which the electrode body 20 is fixed is arranged so that the electrode body 20 is located above and the lid member 12 is located below. Then, the case body 11 is covered with the opening 11a facing downward from above the electrode body 20 supported by the lid member 12. As a result, the electrode body 20 can be housed in the case body 11.

3. 3. Fitting step In step S3, the opening 11a of the case body 11 and the lid member 12 are fitted. The fitting structure of the case body 11 and the lid member 12 is designed so that they can be arranged appropriately with each other and can improve the airtightness and the welding quality. For example, as shown in FIG. 4, the opening 11a of the case body 11 is provided with a step portion 11b for receiving the lid member 12 so that the lid member 12 does not fall inside the case body 11. The case body 11 is designed so that the inner dimension inside the case is smaller than the outer dimension of the lid member 12 in the plane orthogonal to the height direction H. Further, the inner dimensions of the outer side of the case with respect to the step portion 11b are designed to substantially match the outer dimensions of the lid member 12. In other words, the end of the opening 11a of the case body 11 and the lid member 12 are configured so that the play (gap) is "zero" (allowance: for example, ± 50 μm). Therefore, at the time of fitting, as in the prior art shown in FIG. 5, the lid member 12 and the case body 11 come into contact with each other, and the corners of the lid member 12 and / or the case body 11 are rubbed to form minute metal powder. It is a situation where M is likely to occur.

Therefore, in the fitting step disclosed here, first, a blower nozzle 50 is prepared, and the blower nozzle 50 is used to fit the lid member 12 and the case body 11 in the next two steps.
That is, first, in (a) first substep, the blow nozzle 50 is inserted into the through hole 15 of the lid member 12, and the blow nozzle 50 blows air into the case main body 11 while the case main body 11 and the lid. It is fitted to the member 12. At this time, at least one of the members is moved so that the two members are relatively close to each other while keeping the center of the case body 11 in the plan view and the center of the lid member 12 in the plan view.
In the subsequent (b) second sub-step, the blowing from the blowing nozzle 50 is stopped at the timing when the case main body 11 and the lid member 12 are fitted.

In the first sub-step, by starting the fitting while blowing air to the case body 11, it is possible to form an air flow F from the inside to the outside of the case body 11 in the gap between the case body 11 and the lid member 12. .. As a result, even if the lid member 12 and the case body 11 rub against each other to generate metal powder M by the time the fitting is completed, the metal powder M is placed on the air flow F and placed on the outside of the battery case 10. Can be discharged. Further, by forming the airflow F in advance, a reaction force acts against the contact between the lid member 12 and the case body 11 by blocking the airflow F. As a result, the friction between the lid member 12 and the case body 11 can be reduced.

Further, in the second sub-step, by stopping the ventilation at the timing when the case main body 11 and the lid member 12 are completely fitted, the lid member 12 can be smoothly fitted to the case main body 11 without distortion. Further, by stopping the blowing at the timing of fitting, it is possible to prevent the blowing airflow F from invading the inside of the battery case 10 and spraying it on the electrode body 20 to damage the active material layer or the like. .. The ventilation is stopped, for example, when the relative displacement between the case body 11 and the lid member 12 becomes zero in the fitting operation between the case body 11 and the lid member 12 (that is, the lid member 12 is the stage of the case body 11). When it hits the portion 11b), it can be determined as a guide. When the ventilation is stopped after the relative displacement between the case body 11 and the lid member 12 becomes zero, it is preferable to stop the ventilation at a timing less than 5 seconds after the relative displacement becomes zero. .. As a result, it is possible to reduce the generation of the metal powder M itself, and even if the metal powder M is inevitably generated, it is possible to suppress the invasion into the battery case 10 and further into the electrode body 20. Further, it is possible to prevent the electrode body 20 from being damaged by the sphere generated by the blast.

As shown in FIG. 4, the blower nozzle 50 is a cylindrical device that vigorously discharges gas from a small hole at the tip. The blower nozzle 50 can be connected to, for example, a pumping machine (not shown) to discharge gas at a predetermined flow rate and timing. The blower nozzle 50 has a sealed tip portion in the tubular axis direction (corresponding to the height direction H in FIG. 4), and is provided with a nozzle hole in a direction intersecting the tubular axial direction. The blower flow path of the blower nozzle 50 of this example is branched in four directions at the tip of the blower nozzle 50, the width direction W and the thickness direction orthogonal to the width direction. In FIG. 4, a flow path branched in the thickness direction is shown. The side wall of the tip of the blower nozzle 50 is provided with nozzle holes at four locations in the width direction W and the thickness direction. By using such a blower nozzle 50, an airflow F from the inside to the outside of the case body 11 can be suitably formed in the gap between the case body 11 and the lid member 12. Further, since the airflow F does not easily enter the inside of the case body 11, the metal powder M can be efficiently discharged. Further, it is possible to prevent the metal powder M, other foreign substances, and the like from being sent toward the inside of the case body 11. The gas supplied from the blower nozzle 50 to the case body 11 is not particularly limited as long as it does not adversely affect the properties of the battery, and examples thereof include dry air and an inert gas such as nitrogen and argon. ..

4. Welding process In step S4, the case body 11 and the lid member 12 are welded together. Welding can be performed by supplying the case body 11 and the lid member 12 with the energy required for joining along the welding line. The welding may be, for example, arc welding, resistance welding, high energy beam welding, brazing, solid phase welding, or the like, and is preferably high energy beam welding. The energy beam may be a laser, an electron beam, or the like, and the wavelength can be appropriately set depending on the composition, dimensions, and the like of the case body 11 and the lid member 12. As a result, the electrode body 20 can be sealed in the battery case 10.

In the lithium ion battery 1 provided with the non-aqueous electrolytic solution as the non-aqueous electrolyte, the electrolytic solution is injected into the inside of the battery case 10 from the liquid injection hole 15 provided in the lid member 12 in the subsequent step. The non-aqueous electrolyte solution contains a non-aqueous solvent and an electrolyte-supporting salt. The electrolytic solution typically exhibits a liquid state at room temperature (typically 0 to 25 ° C.). The electrolyte supporting salt is, for example, a lithium salt. The non-aqueous solvent and the lithium salt are not particularly limited, and may be the same as those used in the electrolytic solution of the conventional secondary battery. Preferable examples of non-aqueous solvents include aprotic solvents such as carbonates, esters and ethers. Among them, cyclic carbonates such as ethylene carbonate (EC) and propylene carbonate (PC), chain carbonates such as diethyl carbonate (DEC), dimethyl carbonate (DMC) and ethylmethyl carbonate (EMC), and these carbonates are fluorine. It is preferable to contain one or more of the fluorinated chain or cyclic carbonates. Preferable examples of the lithium salt include, for example, LiPF ₆ , LiBF ₄ , and the like. The concentration of the lithium salt in the electrolytic solution can be, for example, 0.8 to 1.3 mol / L. The liquid injection hole 15 after the liquid injection is sealed by, for example, a liquid injection plug 16 that airtightly closes the liquid injection hole 15. The lid member 12 and the liquid injection plug 16 may be firmly fixed by welding, for example. Thereby, the lithium ion battery 1 can be constructed.

The assembled lithium-ion battery 1 can be provided with a function as a battery by appropriately performing a predetermined initial charge / discharge treatment. Further, in order to ensure the high quality of the lithium ion battery 1, aging treatment, short circuit inspection and the like are typically performed before and after the initial charge / discharge treatment. Thereby, the lithium ion battery 1 can be manufactured. In this lithium ion battery 1, the mixing of metal foreign substances at the time of sealing is suppressed as compared with the conventional case. Therefore, for example, the incidence of defective products in which a short circuit occurs in a short circuit inspection is reduced. In other words, the techniques disclosed herein can produce high yield and high quality batteries.

Hereinafter, some examples of the present invention will be described, but the present invention is not intended to be limited to those shown in such specific examples.

[Experimental example]
[Battery production]
First, a positive electrode slurry containing lithium nickel manganese cobalt oxide as a positive electrode active material, acetylene black (AB) as a conductive auxiliary material, and polyvinylidene fluoride (PVdF) as a binder was prepared, and this positive electrode slurry was prepared. Was applied to both sides of an aluminum foil as a positive electrode current collector and dried to obtain a positive electrode provided with a positive electrode active material layer. The positive electrode slurry was not applied to the end portion of the current collector along the longitudinal direction, and an exposed portion of the current collector was provided.

Next, a negative electrode slurry containing graphite powder as a negative electrode active material, styrene butadiene rubber (SBR) as a binder, and carboxymethyl cellulose (CMC) as a thickening material was prepared, and this negative electrode slurry was collected as a negative electrode. A negative electrode provided with a negative electrode active material layer was obtained by applying it to the surface of a copper foil as an electric body and drying it. The negative electrode slurry was not applied to the end portion of the current collector along the longitudinal direction, and an exposed portion of the current collector was provided.

Then, the prepared positive electrode and negative electrode are insulated from the positive electrode active material layer and the negative electrode active material layer via a polyethylene microporous sheet having an average thickness of 20 μm, and the positive and negative current collector exposed portions are respectively in the width direction. They were overlapped so as to protrude to the opposite side. Then, by winding this electrode laminate flatly, a wound type electrode body was obtained. As the battery case, a flat square metal battery case composed of a SUS304 lid member and a case body was prepared. The lid member is provided with a liquid injection hole for injecting an electrolytic solution and external terminals of a positive electrode and a negative electrode. Then, after attaching the positive and negative current collector terminals to the lid member, the positive and negative current collector terminals and the positive and negative current collector exposed portions of the wound electrode body were joined by ultrasonic welding. As a result, the wound electrode body was fixed to the lid member.

[Matching process]
Next, the case main body was put on the wound electrode body fixed to the lid member, and the lid member and the case main body were fitted together by the following four procedures A to D. Then, the lid member and the case body were laser-welded to seal the can, and a battery assembly was obtained. Ten battery assemblies were prepared for each fitting pattern. A nozzle-shaped blower nozzle shown in FIG. 4 was used to blow dry air, and the blown air was switched between blowing and stopping with the tip of the blowing nozzle inserted into the battery case side from the liquid injection hole.

(A) The lid member and the case body were fitted together without blowing air.
(B) After the can was sealed, dry air was blown into the battery case from the liquid injection hole.
(C) When dry air is blown into the battery case from the injection hole at the timing when the case body is finished to be covered with the wound type electrode body, and the lid member and the case body are completely fitted (displacement between the lid member and the case body). When it was zero), the ventilation was stopped.
(D) When dry air is blown into the battery case from the injection hole at the timing when the case body is finished to be covered with the wound type electrode body, and the lid member and the case body are completely fitted (displacement between the lid member and the case body). The blast was stopped 5 seconds after (when it was zero).

[Spy leak test]
A spike leak test was performed on each battery assembly before injecting the liquid assembled as described above. Specifically, in a room temperature (25 ° C.) environment, a load of 6 kN is applied to the battery assembly in the thickness direction orthogonal to the width direction of the battery case, and the wound electrode body is compressed in the stacking direction of the electrode layers. I let you. Then, in such a pressurized state, a spike voltage of 500 V was instantaneously applied between the positive and negative external terminals, and it was confirmed whether or not a leakage current (dielectric breakdown current) flowed. The results are regarded as "OK" when no leak current flows and "NG" when leak current flows, and the number of cells corresponding to each result is aggregated for each process in Table 1 below. It was shown to.

When the fitting was performed in the procedure (A), it was found by the spike leak test that a short circuit occurred in 4 out of 10 cells. It is considered that this is because the metal foreign matter generated during the fitting process invaded the inside of the electrode body and caused a short circuit. On the other hand, in the case of the procedure (C), there are no cells in which a short circuit has occurred in the spike leak test, and by injecting air in the battery case fitting process, a minute short circuit is effective. It was confirmed that it can be suppressed. In the procedure (B), since air was injected after the can was sealed, no significant improvement was observed as compared with the case of the procedure (A) from the viewpoint of discharging metallic foreign matter. Further, in the procedure (D), it was found that a short circuit occurred in 2 out of 10 cells by injecting air for a while after the fitting. This is because the metal foreign matter generated when the battery case was fitted could be discharged to the outside of the case, but by continuing to inject air after that, the electrode body was damaged and the electrode active material layer was peeled off. It is expected that it has been done.

From the above, when the lid member is fitted to the case body, an air flow from the inside of the case to the outside of the case is generated in the vicinity of the fitting portion at an appropriate timing, thereby causing a short circuit caused by a metal foreign substance generated by the fitting. It turned out that it can be reduced. It was also confirmed that the injection of air for generating the air flow was stopped when the fitting was completed, so that damage such as damage to the electrode body was not generated. It is desirable that the timing of stopping the injection of air is earlier than 5 seconds even if it is delayed from the completion of fitting.

Although the present invention has been described in detail above, the above-described embodiments and examples are merely examples, and the inventions disclosed herein include various modifications and modifications of the above-mentioned specific examples. For example, the electrode body is not limited to the winding type, and may be a so-called laminated type electrode body in which a plurality of flat plate-shaped positive electrodes and negative electrodes are laminated via a separator. Further, the technique disclosed herein can be particularly preferably applied to a battery using a non-aqueous electrolyte solution as an electrolyte, but can also be applied to an all-solid-state battery using a solid electrolyte. In this case, the ventilation may be performed by using the safety valve mounting portion or the like instead of the liquid injection hole. The fitting structure of the battery case lid member and the case body is not limited to the above example. For example, the lid member has a T-shaped cross section and covers the case body opening closely from the upper end of the inner surface to the upper surface. It may be configured as follows. In addition, the form of the air flow path of the air nozzle (number, direction, air flow angle, etc. of the nozzle holes), gas type, flow rate, etc. shall be within the range that does not deviate from the essence of the technique disclosed here by those skilled in the art. The design can be changed as appropriate.

1 Battery 10 Battery case 11 Case body 12 Lid member 20 Electrode body

Claims (1)

It is a method of manufacturing a battery in which the case body of the battery case containing the electrode body and the lid member are welded together.
A step of preparing a case body having an opening, a lid member having a through hole that seals the opening and penetrates in the thickness direction, and an electrode body.
The process of accommodating the electrode body in the case body, and
A step of fitting the lid member into the opening of the case body,
Including
The fitting step is
A tubular blower nozzle is used, in which the tip portion in the cylinder axis direction is sealed and a nozzle hole is provided in the direction intersecting the cylinder axis direction.
The blower nozzle is inserted into the through hole of the lid member, and the case body and the lid member are fitted together while blowing air from the blower nozzle into the case body, and the case body and the lid member are fitted together. A method for manufacturing a battery, which comprises stopping the blown air from the blower nozzle at the timing when the fitting is completed .

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