JP6260356B2 - Battery restraint jig - Google Patents

Description

  The present invention relates to a battery restraining jig, and more particularly, to a battery restraining jig for restraining a battery in order to suppress expansion and deformation of a battery case in a battery manufacturing process.

In recent years, lithium ion secondary batteries have been adopted not only as power sources for electronic devices but also as power sources for hybrid vehicles and electric vehicles.
A secondary battery for a vehicle may be mounted on a vehicle as a battery pack in which a plurality of battery modules are connected in series.
For example, in the process of manufacturing a lithium ion secondary battery, a conditioning process for initial charging is performed, and after the conditioning process, the secondary battery is stored in a high temperature environment for a certain period of time in order to stabilize battery performance. The process is carried out.
Further, after the aging process, a self-discharge inspection process is performed in which the voltage is measured to inspect the battery.
In the conditioning process, the aging process, and the self-discharge inspection process, the secondary battery is clamped and restrained by a battery restraining jig having a pair of restraining plates in order to suppress expansion and deformation of the battery case.

As a conventional technique related to a battery restraining jig, for example, a processing device and a manufacturing method for a non-aqueous electrolyte secondary battery disclosed in Patent Document 1 are known.
A processing apparatus for a non-aqueous electrolyte secondary battery disclosed in Patent Document 1 includes a frame body that houses a plurality of batteries in a frame body, a restraining portion that restrains the battery, and a thickness direction of an electrode group in the battery case And a pressing portion for applying a surface pressure via the restraining portion.
In this type of processing apparatus, a plurality of batteries are arranged in a lateral direction in a frame body and restrained by a restraining portion so that the positive electrode terminal and the negative electrode terminal of the battery are on the upper side.

International Publication No. 2011/111153

However, in the case of the battery restraining jig (processing device) disclosed in Patent Document 1, the batteries to be restrained are arranged in the lateral direction, so that, for example, when a large number of batteries are manufactured, a large space is required. There is a problem.
By the way, it is conceivable to stack the battery restraining jigs disclosed in Patent Document 1 and effectively utilize the space in the vertical direction.
However, when the battery restraining jigs are stacked, the upper side of the battery terminals (positive terminal and negative terminal) restrained by the lower battery restraining jig is covered with another battery restraining jig.
For this reason, when battery restraining jigs are simply stacked, if the battery is restrained, it becomes difficult to connect the lower battery terminal to the charging device or self-discharge test equipment, There is a problem that self-discharge inspection cannot be performed.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to effectively utilize the vertical space by stacking, and even when the battery restraining jig that restrains the battery is stacked, the initial charging of the battery The object is to provide a battery restraint jig that enables self-discharge inspection.

In order to solve the above-described problems, the present invention provides a battery restraining jig comprising a pair of restraining members that sandwich a flat battery in the thickness direction and restrain the battery, wherein the battery restraining jig Can be stacked in the vertical direction, and the pair of restraining members restrains the battery so that the positive electrode terminal and the negative electrode terminal of the battery are positioned on the upper side and the thickness direction of the battery coincides with the horizontal direction. A contact portion, and a pair of lead terminals provided on the bottom of one of the restraining members and drawn out from between the pair of restraining members to the outside of the restraining member. And the top of the pair of restraining members includes a recess that allows the projection to be inserted when the battery restraining jig is stacked in the vertical direction. When stacked vertically It said pair of lead terminals included in the pair of restraining members side is characterized by being in contact with the positive and negative terminals of the battery to be restrained by the pair of restraining members of the lower.

According to the present invention, the vertical space can be effectively utilized by stacking the battery restraining jig in the vertical direction, and space saving can be achieved.
In addition, even when the battery restraining jig in which the battery is restrained is stacked up and down, one of the pair of lead terminals of the upper restraining member is connected to the positive terminal of the battery restrained by the lower restraining member, and the other is the negative electrode Connected to terminal.
Since the pair of lead terminals are drawn to the outside of the restraining member from between the pair of restraining members, the battery can be connected to a charging device or a device for self-discharge inspection even when the battery restraining jig restraining the battery is stacked. Initial charge and self-discharge test can be performed.
In addition, when the battery restraining jigs are stacked in the vertical direction, the protrusions provided at the bottom of the upper restraining member are inserted into the recesses provided at the top of the lower restraining member. Can be prevented from shifting in the horizontal direction, and the stacked state can be stabilized.

The present invention also provides a battery restraining jig comprising a pair of restraining members that sandwich a flat battery in the thickness direction and restrain the battery, and the battery restraining jig can be stacked in the vertical direction. And the pair of restraining members are arranged such that a positive electrode terminal and a negative electrode terminal of the battery are positioned on the upper side, a contact portion that restrains the battery so that the thickness direction and the horizontal direction of the battery coincide with each other, A pair of lead terminals provided at the top of the restraining member and drawn out from between the pair of restraining members to the outside of the restraining member, and the bottoms of the pair of restraining members include a protrusion protruding downward. The tops of the pair of restraining members include a recess that allows the protrusion to be inserted when the battery restraining jig is stacked in the vertical direction, and when the battery restraining jig is stacked in the vertical direction. The pair of lead terminals are Characterized in that it is in contact with the positive and negative terminals of the battery to be bound by serial pair of restraining members.

In the battery restraining jig, the protrusion may be a rolling element that can freely roll.
In this case, the battery restraining jig is placed on the placement surface via the rolling element.
Therefore, since the rolling element can freely roll with respect to the mounting surface, a plurality of battery restraining jigs that are stacked and increased in weight can be easily moved together.
In addition, a rolling element is a caster by a wheel or a spherical body, for example.

  According to the present invention, it is possible to provide a battery restraining jig capable of effectively utilizing the vertical space by stacking and enabling the initial charging and self-discharge inspection of the battery even when the battery restraining jig restraining the battery is stacked. Can do.

1 is a perspective view showing a battery according to a first embodiment. It is a perspective view of the battery restraint jig which concerns on 1st Embodiment. It is a side view which shows the state which piled up two battery restraining jigs which restrained the secondary battery up and down. It is a front view which shows the state which piled up the two battery restraint jigs which restrained the secondary battery up and down. It is a side view which shows the state which piled up the two battery restraint jigs which concern on 2nd Embodiment up and down. It is a front view which shows the state which piled up the battery restraint jig which concerns on the modification of 1st Embodiment up and down.

(First embodiment)
The battery restraining jig according to the first embodiment will be described below with reference to the drawings.
The battery restraint jig of this embodiment is a battery restraint jig used in an aging process and a conditioning process in a battery manufacturing process.
The battery according to the present embodiment is a secondary battery mounted on a vehicle, such as a lithium secondary battery or a nickel hydride secondary battery.

A flat secondary battery 10 shown in FIG. 1 includes a flat, substantially rectangular parallelepiped electrode body 11 as a power generation element, and a battery case 20 that houses the electrode body 11.
The electrode body 11 includes a sheet-like positive electrode 12 and a negative electrode 13, and a sheet-like separator 14 interposed between the positive electrode 12 and the negative electrode 13.
The separator 14 is formed of an insulating material that enables the electrolytic solution filled in the battery case 20 to flow.
In the electrode body 11, the positive electrodes 12 and the negative electrodes 13 are alternately stacked via separators 14.
In a state where the electrode body 11 is accommodated in the battery case 20, the stacking direction of the positive electrode 12, the negative electrode 13, and the separator 14 in the electrode body 11 coincides with the thickness direction of the secondary battery 10.
The electrode body 11 includes a positive electrode current collector 16 connected to the positive electrode terminal 15 and a negative electrode current collector 18 connected to the negative electrode terminal 17.

The battery case 20 has a flat, substantially rectangular parallelepiped shape as a whole.
The battery case 20 has a bottomed cylindrical case body 21 and a rectangular plate-like lid 23 that seals the opening 22 of the case body 21.
The lid 23 is fixed to the case body 21 by laser welding.
Both the case body 21 and the lid 23 are made of an aluminum-based metal material (aluminum or aluminum alloy).

A safety valve 24 is provided near the longitudinal center of the lid 23.
The safety valve 24 has a function of opening when the pressure in the battery case 20 reaches a predetermined pressure due to the generation of gas in the battery case 20 and releasing the gas in the battery case 20 to the outside.
The lid portion 23 is provided with a liquid injection port 25 for injecting the electrolytic solution into the battery case 20, and the liquid injection port 25 is sealed by a sealing member 26.

Further, a pair of circular through holes 27 are formed in the vicinity of both ends in the longitudinal direction of the lid portion 23.
The positive terminal 15 is inserted into one through hole 27, and the negative terminal 17 is inserted into the other through hole 27.
In a state where the electrode body 11 is accommodated in the battery case 20, the positive electrode terminal 15 and the negative electrode terminal 17 protrude from the through hole 27 in a direction perpendicular to the thickness direction of the secondary battery 10.
In order to prevent leakage of the electrolytic solution from the through hole 27, an annular seal member (not shown) surrounding the positive electrode terminal 15 and the negative electrode terminal 17 is attached.
In addition, the positive terminal 15 and the negative terminal 17 are insulated from the case body 21.

In the present embodiment, the electrode body 11 is accommodated in the case body 21 in the manufacturing process of the secondary battery 10.
Next, the lid part 23 is attached to the opening part 22, and the lid part 23 is joined to the case main body part 21 by laser welding.
By joining the lid part 23 to the case body part 21 by laser welding, the opening part 22 is completely sealed, and the housing of the electrode body 11 in the battery case 20 is completed.
After the electrode body 11 is accommodated in the battery case 20, the electrolytic solution is injected from the injection port 25, and the injection port 25 is sealed by the sealing member 26 after the injection of the electrolytic solution.
After the injection, the secondary battery 10 is initially charged in a conditioning process for initial charging.
After the conditioning process, the process proceeds to an aging process, and the secondary battery 10 is stored for a certain period in a high temperature environment in order to stabilize the battery performance.
After the aging process, the process proceeds to the self-discharge inspection process.
In the self-discharge inspection process, the secondary battery 10 is subjected to self-discharge inspection by voltage measurement, and non-defective products are selected based on the inspection result.

In a series of processes including a conditioning process, an aging process, and a self-discharge inspection process, the secondary battery 10 is restrained by the battery restraining jig 30 shown in FIG. 2 in order to prevent expansion and deformation of the battery case 20.
The battery restraining jig 30 of this embodiment includes a pair of restraining plates 31, and four bolts 32 and four nuts 33 as connecting members that connect the pair of restraining plates 31 to each other.
Further, the battery restraining jig 30 of the present embodiment has a configuration that can be stacked up and down.

The restraining plate 31 as the restraining member is a flat plate made of an aluminum-based metal material (aluminum or aluminum alloy).
The thickness of the restraint plate 31 is set so that the restraint plate 31 has a strength necessary for restraining the secondary battery 10.
The restraint plate 31 has a plate surface with a larger area than the surface of the maximum area of the case main body 21 of the battery case 20.
As shown in FIG. 3, in the battery restraining jig 30 according to the present embodiment, the pair of restraining plates 31 are arranged so that the plate surfaces 34 and 35 of the pair of restraining plates 31 are parallel to each other and become vertical surfaces. Yes.
The plate surfaces 34 facing each other in the pair of restraining plates 31 correspond to contact portions that come into contact with the secondary battery 10 when the secondary battery 10 is clamped in the thickness direction and restrained.
A plate surface 35 opposite to the plate surface 34 as the contact portion is a surface on the outside.

As shown in FIGS. 3 and 4, the restraint plate 31 of this embodiment includes a bottom portion 36 having a surface parallel to the placement surface F.
Two ball casters 37 are embedded in the bottom portion 36 of the restraining plate 31 to facilitate the movement of the battery restraining jig 30 on the placement surface F.
The ball caster 37 is provided with a spherical roller 38 as a rolling element.
A part of the spherical roller 38 protrudes from the bottom portion 36, and the spherical roller 38 corresponds to a protruding portion.
As shown in FIG. 4, the position at which the ball caster 37 is provided in the bottom portion 36 is near the longitudinal end portion of the restraining plate 31.

On the other hand, the constraining plate 31 includes a top portion 39 opposite to the bottom portion 36, and a surface parallel to the surface of the bottom portion 36 is formed on the top portion 39.
The top portion 39 is provided with a concave portion 40, and the concave portion 40 is inserted with a spherical roller 38 of a ball caster 37 of the battery restraining jig 30 which is an upper side when the battery restraining jig 30 restraining the secondary battery 10 is stacked up and down. It has a space to be.
Therefore, as shown in FIG. 4, the position where the concave portion 40 is provided at the top portion 39 is closer to the end portion in the longitudinal direction of the restraint plate 31 and corresponds to the position where the ball caster 37 is provided in the vertical direction.

The restraint plate 31 includes four through holes 41 into which bolts 32 can be inserted.
The bolt 32 has a head portion 42 and a screw shaft portion 43, and the nut 33 has a screw hole 44 that allows the screw shaft portion 43 to be screwed (see FIG. 2).
Bolts 32 are inserted into the through holes 41 of the restraint plate 31, and the restraint plate 31 can move in the axial direction of the bolts 32.
The plate surfaces 34 and 35 of the restraint plate 31 are surfaces that are perpendicular to the axial direction of the bolt 32.
A space into which the secondary battery 10 is inserted is formed between the plate surfaces 34 inside the pair of restraining plates 31.
The restraint plate 31 is not pulled out of the bolt 32 by the nut 33 provided on the bolt 32.
By adjusting the position of the nut 33 with respect to the bolt 32, the restraint plates 31 can be brought close to each other or separated from each other.
The pair of restraining plates 31 restrains the secondary battery 10 by pressing so that the thickness direction of the secondary battery 10 coincides with the horizontal direction.

In the present embodiment, a pair of lead terminals 45 is provided at a position between the ball casters 37 at the bottom 36 of one of the pair of restraint plates 31.
The other restraining plate 31 facing the one restraining plate 31 does not include the lead terminal 45.
The pair of lead terminals 45 are each formed in a rectangular plate shape with a conductive material (for example, copper), and are fixed to the restraining plate 31 via an insulating member (not shown).
The insulating member is for insulation between the lead terminal 45 and the restraining plate 31.
The pair of lead-out terminals 45 are used to facilitate initial charge and self-discharge inspection of the secondary battery 10 restrained by the battery restraining jig 30 on the lower side when the battery restraining jig 30 is stacked up and down. Is provided.
The pair of lead terminals 45 contacts the positive terminal 15 and the negative terminal 17 of the secondary battery 10 that are restrained by the lower restraining plate 31 in a state where the battery restraining jigs 30 are stacked one above the other.
The length of the long side of the lead terminal 45 is set sufficiently longer than the thickness of the restraining plate 31.
The length of the short side of the lead terminal 45 is set larger than the diameter of the positive terminal 15 (or the negative terminal 17) (see FIG. 4).

As shown in FIG. 3, one end portion of the lead terminal 45 is located between the plate surface 34 on the contact portion side of the pair of restraining plates 31, and the other end portion of the lead terminal 45 is the plate surface 34. It is in the position pulled out from the plate surface 35 on the opposite side.
The lead terminal 45 includes an inner portion 46 that is a portion from the plate surface 34 on the contact portion side to one end portion, an outer portion 47 that is a portion that is drawn outward from the plate surface 35 of the lead terminal 45, and an inner side An intermediate portion 48 is provided between the portion 46 and the outer portion 47.
The length of the inner portion 46 is set so as to be between the plate surface 34 of the restraint plate 31 that does not include the extraction terminal 45 and the positive electrode terminal 15 (or the negative electrode terminal 17) of the lower secondary battery 10. .
The inner portion 46 of the lead terminal 45 is bent so that one end portion is directed toward the bottom portion 36 so as to be surely brought into contact with the positive electrode terminal 15 (or the negative electrode terminal 17) of the secondary battery 10.
The outer portion 47 of the lead terminal 45 is pulled out horizontally, and the end of the outer portion 47 can be connected to the charging device of the secondary battery 10 or the terminal T of the self-discharge inspection device.
The intermediate part 48 of the lead terminal 45 is a part fixed to the restraining plate 31 via an insulating member (not shown).

As shown in FIG. 4, one lead terminal 45 abuts on the positive electrode terminal 15 of the secondary battery 10 restrained by the lower battery restraining jig 30 in a state where the battery restraining jig 30 is stacked up and down. .
The other lead terminal 45 abuts on the negative electrode terminal 17 of the secondary battery 10 restrained by the lower battery restraining jig 30 in a state where the battery restraining jig 30 is stacked up and down.

Next, the procedure for restraining the secondary battery 10 by the battery restraining jig 30 and the stacking of the battery restraining jig 30 restraining the secondary battery 10 will be described.
The secondary battery 10 restrained by the battery restraining jig 30 is in a state before the initial charging is performed.
When the secondary battery 10 is restrained, the bolts 32 are inserted into the through holes 41 of the pair of restraining plates 31 in advance.
The space between the pair of restraint plates 31 is expanded so that the secondary battery 10 can be disposed between the pair of restraint plates 31.
Next, the secondary battery 10 is positioned between the pair of restraining plates 31, and the positive electrode terminal 15 and the negative electrode terminal 17 are on the upper side, and the surface of the case body portion 21 of the battery case 20 is the surface of the restraint plate 31. Is brought into contact with the plate surface 34 on the contact portion side.
Positioning of the secondary battery 10 in the height direction with respect to the restraint plate 31 is performed such that the heights of the tips of the positive electrode terminal 15 and the negative electrode terminal 17 are substantially the same as the heights of the top portions 39 of the pair of restraint plates 31.

Next, by fastening the nut 33 into which the bolt 32 is screwed, the pair of restraining plates 31 are brought close to each other from both sides of the secondary battery 10 to sandwich the secondary battery 10. The battery 10 is clamped.
The secondary battery 10 is clamped and restrained by the restraining plate 31 in the thickness direction.
The clamping direction of the pair of restraining plates 31 is the horizontal direction.
As shown in FIG. 3, the secondary battery 10 is in a state of being restrained by the pinching pressure between the pair of restraining plates 31.
A surface pressure is applied to the electrode body 11 in the battery case 20 in the stacking direction, and expansion deformation of the battery case 20 is prevented.

Next, the battery restraining jig 30 restraining another secondary battery 10 is stacked on the battery restraining jig 30 restraining the secondary battery 10.
When the battery restraining jigs 30 restraining the secondary battery 10 are stacked so as to be up and down, the top 39 of the restraining plate 31 of the lower battery restraining jig 30 is restrained by the upper battery restraining jig 30. The bottom portion 36 of the plate 31 abuts.
A ball caster 37 of the restraining plate 31 of the upper battery restraining jig 30 is accommodated in the recess 40 of the restraining plate 31 of the lower battery restraining jig 30.
Specifically, the portion of the ball caster 37 that protrudes from the bottom 36 of the spherical roller 38 is inserted into the recess 40.
By inserting the spherical roller 38 into the recess 40, the relative movement of the upper and lower battery restraining jigs 30 in the horizontal direction is suppressed, and the positional deviation of the upper and lower battery restraining jigs 30 is prevented.

In a state where the battery restraining jig 30 is stacked up and down, the pair of lead terminals 45 of the upper battery restraining jig 30 are the positive terminals 15 included in the secondary battery 10 restrained by the lower battery restraining jig 30. And connected to the negative terminal 17.
Specifically, one lead terminal 45 provided in the upper battery restraining jig 30 contacts the positive terminal 15 of the secondary battery 10 restrained by the lower battery restraining jig 30.
The other lead terminal 45 provided in the upper battery restraining jig 30 abuts on the negative electrode terminal 17 of the secondary battery 10 restrained by the lower battery restraining jig 30.
The inner portion 46 of the lead terminal 45 is bent so that one end portion is directed toward the bottom 36.
For this reason, in the state where the battery restraining jig 30 is stacked up and down, the inner part 46 bent toward the bottom 36 side of the lead terminal 45 becomes almost horizontal by elastic deformation, and the positive electrode of the secondary battery 10. It contacts the terminal 15 (or the negative terminal 17).
The inner portion 46 of the lead terminal 45 is urged toward the positive terminal 15 (or the negative terminal 17) by a force for restoring from the elastic deformation.

The two battery restraining jigs 30 stacked one above the other are initially charged in the conditioning process.
In the conditioning step, each initial charge is performed while the secondary battery 10 is restrained by the battery restraining jig 30.
As for the secondary battery 10 restrained by the upper battery restraining jig 30, the upper side of the secondary battery 10 is open, so that the terminals (not shown) of the charging device are the positive terminal 15 and the negative terminal 17. And connected respectively.
For the secondary battery 10 restrained by the lower battery restraining jig 30, the terminal T of the charging device is connected to the lead terminal 45 in contact with the positive terminal 15 and the negative terminal 17 (in FIG. 3, the positive terminal). Only the terminal T connected to the lead terminal 45 that contacts the terminal 15 is shown).

When the initial charging is completed, the two battery restraining jigs 30 to which the secondary battery 10 is restrained are moved to the place of the aging process.
In order to stabilize battery performance in the aging process, the secondary battery 10 is stored for a certain period in a high temperature environment (for example, a heating chamber) in a state of being restrained by the battery restraining jig 30.
The two battery restraining jigs 30 stacked are heavier than the one battery restraining jig 30, but the battery restraining jig 30 is provided with a ball caster 37. The tool 30 is easy to move.
The operator does not need to lift the two battery restraining jigs 30 and move them to the aging storage location, and may push the two battery restraining jigs 30 to travel on the mounting surface F.
The secondary battery 10 restrained by the battery restraining jig 30 is heated in the aging process.

After the aging process, the secondary battery 10 is inspected by measuring the voltage in the self-discharge inspection process.
The two battery restraining jigs 30 are moved from the place of the aging process to the place of the self-discharge inspection process by running the placement surface F using the ball caster 37.
The voltage measurement of the secondary battery 10 in the self-discharge inspection process is performed in a state where the secondary battery 10 is restrained by the battery restraining jig 30.
As for the secondary battery 10 restrained by the upper battery restraining jig 30, since the upper side of the secondary battery 10 is opened, the terminal (not shown) provided in the self-discharge inspection device is the positive terminal 15. And the negative electrode terminal 17 are respectively connected.
For the secondary battery 10 constrained by the lower battery restraining jig 30, the terminals T (for the sake of convenience, the same reference numerals as the terminals of the charging device) provided in the self-discharge inspection device are the positive terminal 15 and the negative terminal 17. Is connected to the lead-out terminal 45 in contact with.
The secondary batteries 10 respectively restrained by the two battery restraining jigs 30 are released from the restraint by the battery restraining jigs 30 after the self-discharge inspection, are selected according to the inspection results, and transferred to the next process.
Thus, in this embodiment, in order to suppress the expansion deformation of the battery case 20 in the series of steps of the conditioning process, the aging process, and the self-discharge inspection process, the battery includes a battery restraining jig provided with a pair of restraining plates 31. It is pinched by 30 and restrained.

The battery restraining jig 30 of this embodiment has the following effects.
(1) The vertical space can be effectively utilized by stacking the battery restraining jig 30 in the vertical direction, and space saving can be achieved. Even if the battery restraining jig 30 restrained by the secondary battery 10 is stacked up and down, one of the pair of lead terminals 45 of the battery restraining jig 30 on the upper side is restrained by the battery restraining jig 30 on the lower side. The secondary battery 10 is connected to the positive terminal 15 and the other is connected to the negative terminal 17. Since the pair of lead terminals 45 are drawn to the outside of the restraint plate 31 from between the pair of restraint plates 31, the charging device and the self-discharge test can be performed even when the battery restraint jig 30 restraining the secondary battery 10 is stacked. The secondary battery 10 can be initially charged and a self-discharge test can be performed.

(2) Since the spherical roller 38 of the ball caster 37 provided on the bottom 36 of the upper restraint plate 31 is inserted into the recess 40 provided on the top 39 of the lower restraint plate 31, the upper and lower battery restraining jigs 30. Relative movement in the horizontal direction is suppressed. For this reason, the horizontal displacement of the upper and lower battery restraining jigs 30 is prevented, and the stacked state of the upper and lower battery restraining jigs 30 can be stabilized.

(3) The battery restraining jig 30 is mounted on the mounting surface F via the ball caster 37. Since the spherical roller 38 of the ball caster 37 can roll with respect to the mounting surface F, the two battery restraining jigs 30 that are stacked and increased in weight can be easily moved together. For this reason, it is not necessary for the operator to lift and move the two battery restraining jigs 30. The operator only has to push the two battery restraining jigs 30 to travel on the mounting surface F, and the load in the moving work is reduced. Is done.

(Second Embodiment)
Next, a battery restraining jig according to the second embodiment will be described.
The battery restraining jig of this embodiment is different from that of the first embodiment in that the battery restraining jig is a restraining plate provided with a protrusion that is inserted into the recess instead of the ball caster.
Since this embodiment is different from the first embodiment in the configuration of the restraint plate, the description of the first embodiment is used for the configuration and the secondary battery excluding the restraint plate in the battery restraint jig, and is common. A sign is used.

As shown in FIG. 5, the battery restraining jig 50 includes a restraining plate 51 as a pair of restraining members.
The constraining plate 51 is a flat plate formed of an aluminum-based metal material (aluminum or aluminum alloy), and has plate surfaces 52 and 53 having a larger area than the maximum area surface of the case main body 21 of the battery case 20.
The thickness of the restraint plate 51 is set so that the strength necessary for restraining the secondary battery 10 is provided.
The plate surfaces 52 facing each other in the pair of restraining plates 51 correspond to contact portions that come into contact with the secondary battery 10 when the secondary battery 10 is restrained by being clamped in the thickness direction.
A plate surface 53 on the opposite side to the plate surface 52 as the contact portion is a surface on the outside.
The constraining plate 51 is formed with four through holes 54 into which the bolts 32 can be inserted.

As shown in FIG. 5, the restraint plate 51 of this embodiment includes a bottom portion 55 having a surface parallel to the placement surface F.
A protrusion 56 is provided on the bottom 55 of the restraining plate 51 so as to protrude downward.
The protruding portion 56 is formed with a tapered portion that narrows the protruding portion 56 toward the tip.

On the other hand, the restraint plate 51 includes a top portion 57 that is opposite to the bottom portion 55, and a surface parallel to the surface of the bottom portion 55 is formed on the top portion 57.
The top part 57 is provided with a recessed part 58, and the recessed part 58 has a space in which the protruding part 56 of the battery restraining jig 50 on the upper side when the battery restraining jig 50 restraining the secondary battery 10 is stacked up and down. Have.
Therefore, the position where the concave portion 58 is provided in the top portion 57 is near the end portion in the longitudinal direction of the restraint plate 51 and is a position corresponding to the position where the projection portion 56 is provided in the vertical direction.
The tapered portion of the protrusion 56 facilitates the insertion of the protrusion 56 into the recess 58.

According to the battery restraining jig of the present embodiment, the same operational effects as the operational effect (1) of the first embodiment are exhibited.
In this embodiment, the protrusion 56 provided on the bottom 55 of the upper restraint plate 51 is inserted into the recess 58 provided on the top 57 of the lower restraint plate 51. By fitting the recess 58 and the projection 56, the relative movement of the upper and lower battery restraining jigs 50 in the horizontal direction is prevented.
Therefore, the horizontal displacement of the upper and lower battery restraining jigs 50 is reliably prevented, and the stacked state of the upper and lower battery restraining jigs 50 can be further stabilized.

(Modification)
Next, a battery restraining jig according to a modification will be described.
This modification is a modification of the first embodiment, and the battery restraining jig according to this modification is different from the first embodiment in that an extraction terminal is provided on the top of the restraining plate.
In the battery restraining jig 60 according to this modification shown in FIG. 6, a lead terminal 45 is provided on the top 39 of the restraining plate 31.
In the battery restraining jig 60 according to this modification, the secondary battery 10 is restrained by the pair of restraining plates 31 in a state where the leading terminals 45 are in contact with the tips of the positive electrode terminal 15 and the negative electrode terminal 17, respectively.
According to this modification, even if the battery restraining jig 60 that restrains the secondary battery 10 is stacked up and down, it can be connected to a charging device or a device for self-discharge inspection using the lead terminal 45. Initial charge and self-discharge test can be performed.
This modification can also be applied to the battery restraining jig 50 of the second embodiment.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.

In the above embodiment (including modifications), the battery restraining jig is used in the conditioning process, the aging process, and the self-discharge inspection process of the battery manufacturing process. This does not hinder the use of the battery restraining jig in each process other than the conditioning process, aging process and self-discharge inspection process in the battery manufacturing process.
In the above embodiment (including modifications), the two battery restraining jigs are stacked up and down, but the number of the battery restraining jigs stacked up and down is not particularly limited. For example, three or more batteries A restraining jig may be stacked.
In the above embodiment (including modifications), the battery restraining jig is provided with four protrusions and recesses, but this is not restrictive. For example, the number of protrusions and recesses is not particularly limited. In addition, it is not essential that the battery restraining jig is provided with a protrusion and a recess. For example, the battery restraining jig on the upper side of the restraining plate (restraining member) of the battery restraining jig on the lower side ( The bottom of the restraining member) may be contacted and simply stacked. Further, when the protrusion is a rolling element, a cylindrical roller or a wheel may be used instead of the spherical roller.
In the above embodiment (including modifications), a pair of restraining plates are fastened using bolts and nuts, and the battery is clamped from the thickness direction of the battery. A restraint plate may be fastened. For example, metal bands may be used instead of bolts and nuts.
In the above embodiment (including modifications), the battery subject to restraint is a stacked secondary battery. However, the battery subject to restraint may be, for example, a wound secondary battery. If it is a flat battery, it will not specifically limit.

DESCRIPTION OF SYMBOLS 10 Secondary battery 11 Electrode body 15 Positive electrode terminal 17 Negative electrode terminal 20 Battery case 30, 50, 60 Battery restraint jigs 31, 51 Restraint plate (as restraint member)
34, 52 Plate surface (contact part)
35, 53 Plate surface 36, 55 Bottom portion 37 Ball caster 38 Spherical roller 39, 57 Top portion 40, 58 Recess 45 Extraction terminal 56 Projection portion F Mounting surface T Terminal

Claims (3)

A battery restraining jig comprising a pair of restraining members for sandwiching a flat battery in the thickness direction and restraining the battery,
The battery restraining jig can be stacked vertically.
The pair of restraining members are:
The positive electrode terminal and the negative electrode terminal of the battery are positioned on the upper side, and a contact portion that restrains the battery so that the thickness direction and the horizontal direction of the battery coincide with each other,
A pair of lead terminals provided at the bottom of one of the restraining members and led out of the restraining member from between the pair of restraining members,
The bottom portions of the pair of restraining members include a protruding portion protruding downward,
The tops of the pair of restraining members include a recess that allows the protrusion to be inserted when the battery restraining jig is stacked in the vertical direction.
When said battery restraining jigs are stacked in the vertical direction, the pair of lead terminals provided in the upper side of the pair of restraining member, the positive and negative terminals of the battery to be restrained by the pair of restraining members of the lower A battery restraining jig that is brought into contact with the battery. A battery restraining jig comprising a pair of restraining members for sandwiching a flat battery in the thickness direction and restraining the battery,
The battery restraining jig can be stacked vertically.
The pair of restraining members are:
The positive electrode terminal and the negative electrode terminal of the battery are positioned on the upper side, and a contact portion that restrains the battery so that the thickness direction and the horizontal direction of the battery coincide with each other,
A pair of lead terminals provided on the top of one of the restraining members and led out of the restraining member from between the pair of restraining members;
The bottom portions of the pair of restraining members include a protruding portion protruding downward,
The tops of the pair of restraining members include a recess that allows the protrusion to be inserted when the battery restraining jig is stacked in the vertical direction.
When the battery restraining jig is stacked in the vertical direction, the pair of lead terminals are brought into contact with the positive terminal and the negative terminal of the battery restrained by the pair of restraining members. jig.   The battery restraining jig according to claim 1, wherein the protrusion is a rolling element that can freely roll.

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