JP2010135247A - Sealed battery, battery with connection member and battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain burning by a spreading fire to an adjacent battery, even when a battery exists next to a sealed battery. <P>SOLUTION: This sealed battery 10 has a case body 12 and a sealing plate 14 for blocking up an opening of the case body 12. The sealing plate 14 has a sealing plate body 20 forming a through-hole 20a, a safety valve 22 arranged so as to cover the through-hole 20a, and a connecting terminal 24 arranged in the sealing plate body 20 in a position different from the safety valve 22. The safety valve 22 has a cap 30 forming a valve chest 34 communicating with the through-hole 20a, and a valve element 32 arranged in the valve chest 34, and an exhaust hole 30d is formed on a tip surface of the cap 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealed battery, a battery with a connecting member, and an assembled battery.

  Conventionally, as disclosed in the following Patent Document 1 and the like, an assembled battery connected to each other by a connecting member is known. In the assembled battery disclosed in Patent Document 1, adjacent batteries are arranged so as to be opposite to each other, and one end of a flat connection member is connected to the positive terminal of one battery, The other end is connected to the negative terminal of the other battery. The positive electrode terminal is formed in a shape protruding in a cylindrical shape from the sealing plate, and the connecting member is joined to the front end surface of the positive electrode terminal in a state of covering the front end surface of the positive electrode terminal.

The battery is provided with an exhaust hole for removing the gas generated in the battery at the time of abnormality, but when this exhaust hole is formed in the positive electrode terminal, it will be formed on the side surface of the positive electrode terminal, Even if the connection terminal is joined to the front end surface of the positive electrode terminal, the exhaust hole is not blocked.
JP 2004-711168 A

  However, in a battery in which an exhaust hole is formed on the side surface of the positive electrode terminal that protrudes in a cylindrical shape from the sealing plate, the exhaust hole faces the direction in which the adjacent battery exists, so that when the gas is discharged, the flame However, there is a problem that the flame may directly reach the adjacent battery, and there is a risk of causing similar firing.

  Therefore, the present invention has been made in view of such a point, and the object of the present invention is to suppress similar burning to the adjacent battery even when the battery exists next to the sealed battery. Is to make it.

  In order to achieve the above object, the present invention is a sealed battery comprising a case body having a shape with one opening and a sealing plate that closes the opening of the case body, wherein the sealing plate has a through hole. A sealing plate body formed so as to cover the through hole, and a connection terminal provided on the sealing plate body at a position different from the safety valve, and the safety valve is provided in the through hole. The sealed battery includes a cap that forms a communicating valve chamber and a valve body that is disposed in the valve chamber, and an exhaust hole is formed in a front end surface of the cap.

  In the sealed battery of the present invention, since the connection terminal is provided on the sealing plate main body at a position different from the safety valve, the cap does not need to have strength for fixing the connection member. For this reason, it is possible to provide an exhaust hole in the front end surface of the cap. And since the exhaust hole is provided in the front end surface of the cap, when gas is generated in the case main body for some reason and this gas is extracted, this gas is perpendicular to the sealing plate main body from the front end surface of the cap. Erupts in any direction. For this reason, when a plurality of sealed batteries are arranged so as to be aligned along the direction of the sealing plate body, even if a flame is ejected at the time of gas ejection, it is suppressed that the flame directly reaches the adjacent battery. As a result, it is possible to suppress similar burning to the adjacent battery.

  Here, it is preferable that the cap has a breakable portion that can be broken by the gas pressure in the case body. In this aspect, when an excessive gas is generated, the gas can be exhausted by breaking the planned fracture portion.

  In this aspect, the planned fracture portion may be formed on the tip surface of the cap. In this aspect, in addition to being able to exhaust gas by the valve opening operation by the valve body of the safety valve, when an excessive gas pressure occurs, the rupture scheduled portion of the cap end face breaks and the gas Erupts in a direction perpendicular to the sealing plate body. Therefore, it is easy to suppress similar firing to the adjacent battery. That is, two-stage exhaust according to the generated gas pressure is possible. Thereby, it is possible to effectively cope with abnormal gas pressure increase. In addition, since the strength is not required for the cap, it is possible to provide a planned fracture portion on the tip surface of the cap.

  Moreover, the said fracture | rupture planned part may be formed in the side surface of the said cap. In this aspect, gas can be exhausted by the valve opening operation of the valve body of the safety valve. In addition, when excessive gas pressure occurs, the planned fracture portion on the side surface of the cap breaks, and the gas is discharged. It ejects in a direction perpendicular to the sealing plate body. Therefore, two-stage exhaust according to the generated gas pressure is possible. Thereby, it is possible to effectively cope with abnormal gas pressure increase. The direction in which the gas is ejected is regulated in a direction perpendicular to the sealing plate body by the side surface of the cap, and the side surface of the cap breaks. Can be bigger.

  Moreover, the said fracture | rupture planned part may be provided in the said valve body. In this aspect, when excessive gas is generated, the gas can be exhausted by breaking the planned breakage portion of the valve body.

  The connection terminal may be formed integrally with the sealing plate body. In this aspect, it is not necessary to weld and fix the connection terminal to the sealing plate body.

  The sealing plate main body is formed in a circular shape, and when the sealing plate main body is caulked to the case main body, the safety valve is disposed at the center of the sealing plate main body, and the connection terminal has a threaded portion. And it is preferable to arrange | position in the place shifted | deviated from the center of the said sealing board main body. In this aspect, since the connection terminal is disposed at a position shifted from the center of the sealing plate main body, the torque generated when the connection plate is fastened to the connection terminal acts on the caulked portion between the case main body and the sealing plate main body. This can be suppressed.

  Moreover, the front end surface of the connection terminal may protrude from the end of the case body. In this aspect, it is possible to prevent the connection member connected to the connection terminal from being short-circuited by coming into contact with the case main body.

  Moreover, the front end surface of the cap may protrude from the front end surface of the connection terminal. In this aspect, since the tip end surface of the cap in which the exhaust hole is formed is in a position protruding from the tip end surface of the connection terminal, it is avoided that the connection member (bus bar) is disposed in the path through which the gas is ejected. Can do. Therefore, it becomes easy to design an exhaust path as a battery pack.

  Moreover, the front end surface of the connection terminal may protrude from the front end surface of the cap. In this aspect, it is possible to avoid that the direction of the connection member (bus bar) connected to the connection terminal is restricted by the cap.

  The present invention is a battery with a connecting member comprising the sealed battery and a connecting member for electrically connecting the sealed battery to another sealed battery, and the connecting member includes: A battery with a connecting member in which a through hole is formed at a position corresponding to the position of the exhaust hole of the cap.

  In the present invention, a through hole is formed in the connecting member at a position corresponding to the position of the exhaust hole of the cap. In the connecting member, the gas ejected through the exhaust hole can be inserted. It is also possible to connect the connection member to the sealed battery in a posture in which the connection member is located on the upper side. That is, it is possible to increase the degree of freedom of the orientation of the connecting member while securing a passage for ejecting gas in a direction perpendicular to the sealing plate body.

  In addition, the present invention includes a plurality of the sealed batteries, the sealed batteries are arranged along a direction parallel to the sealing plate body, and the plurality of sealed batteries are electrically connected to each other by a connecting member. It is an assembled battery.

  In the assembled battery of the present invention, even when gas is ejected from a certain sealed battery through the exhaust hole, the gas can be prevented from directly reaching the adjacent sealed battery. Therefore, it is possible to suppress similar burning to the adjacent battery.

  As described above, according to the present invention, it is possible to suppress firing of adjacent batteries.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a sealed battery 10 according to the present embodiment includes a case main body 12 having a shape in which one side is open, and a sealing plate 14 that closes the open end of the case main body 12. It is configured as. The case body 12 and the sealing plate 14 constitute a hollow case 16.

  More specifically, the case main body 12 has a circular plate-like bottom wall (not shown) and a cylindrical case side wall 12a that rises upward from the peripheral edge of the bottom wall. The diameter is slightly smaller than the inner diameter of 12a. The sealing plate 14 is caulked while being fitted inside the upper end portion of the side wall 12a via an insulating gasket (not shown) made of resin, and is fixed to the case side wall 12a.

  An electrode group (not shown) is accommodated in the case 16, and the positive electrode plate of this electrode group is electrically connected to the sealing plate 14 via a lead (not shown), while the negative electrode plate of the electrode group is The case body 12 is electrically connected via a lead (not shown). That is, in this embodiment, the case main body 12 constitutes the negative electrode of the battery, and the sealing plate 14 constitutes the positive electrode of the battery. The case body 12 may constitute the positive electrode of the battery, and the sealing plate 14 may constitute the negative electrode of the battery.

  Further, a relatively large amount of electrolyte is enclosed in the case 16. The sealed battery 10 is configured to be able to discharge a large current of 30 A or more (for example, about 100 A).

  The sealing plate 14 includes a sealing plate main body 20, a safety valve 22, and a connection terminal 24. The sealing plate main body 20 is formed with a partially recessed portion or a protruding portion, but is formed in a substantially flat plate shape as a whole, and is formed in a disk shape. And the peripheral part of the sealing board main body 20 is couple | bonded with the case main body 12 in the state which interposed the gasket which is not illustrated.

  The central portion of the sealing plate body 20 is slightly recessed, and a through hole 20a is formed in the recessed portion. The safety valve 22 is provided so as to cover the through hole 20a. That is, the safety valve 22 is located at the center of the sealing plate body 20.

  As shown in FIG. 2, the safety valve 22 includes a cap 30 and a valve body 32. The cap 30 forms a valve chamber 34 communicating with the through hole 20 a between the cap plate body 20 and the cap 30. The cap 30 is formed at a cylindrical side surface portion 30a extending in a direction orthogonal to the sealing plate body 20, an end surface portion 30b formed at a distal end portion of the side surface portion 30a, and a proximal end portion of the side surface portion 30a. And a joint portion 30c. The end surface portion 30b constitutes the tip surface of the cap 30, and the end surface portion 30b is located at a position protruding upward (in the longitudinal direction of the battery) in FIG.

  An exhaust hole 30d is formed through the end surface portion 30b of the cap 30, and the valve chamber 34 communicates with the outside of the cap 30 through the exhaust hole 30d. Although the shape of the exhaust hole 30d is not particularly limited, in the present embodiment, for example, as shown in FIG. 3A, the exhaust hole 30d is formed in an arc shape concentric with the end face portion 30b. The exhaust hole 30d is not limited to a configuration in which only one exhaust hole 30d is provided, and a plurality of exhaust holes 30d may be provided as shown in FIG. FIG. 3B shows an example in which a plurality of exhaust holes 30d are arranged at intervals in the circumferential direction, and each exhaust hole 30d is formed as a long hole, but the present invention is not limited to this.

  The joint portion 30c extends outward in the radial direction from the base end of the side surface portion 30a and is formed in a flange shape. And the cap 30 is surface-joined by welding etc. with the outer surface of the sealing board main body 20 in the junction part 30c.

  The valve body 32 is made of rubber which is an elastic body in the present embodiment, and is accommodated in the valve chamber 34. The valve body 32 is disposed so as to be sandwiched between the sealing plate body 20 and the end surface portion 30 b of the cap 30. The valve body 32 is formed such that the intermediate portion 32 a in the height direction has the largest diameter (wide), and the diameter of the intermediate portion (large diameter portion) 32 a is larger than the inner diameter of the side surface portion 30 a of the cap 30. It is getting bigger. For this reason, in order to arrange the valve body 32 in the cap 30, it is necessary to insert the intermediate portion 32a of the valve body 32 into the cap 30 in a state compressed in the width direction. In the valve chamber 34, the peripheral edge portion of the intermediate portion 32 a of the valve body 32 is in airtight contact with the inner surface of the side surface portion 30 a of the cap 30, whereby the exhaust hole 30 d is opened in the valve chamber 34. And a room (outer chamber) in which the through hole 20a is opened (inner chamber) in an airtight manner (valve closed state).

  The valve body 32 has a shape that gradually decreases in diameter from the large diameter portion 32a toward both end portions (the end portion on the through hole 20a side and the end portion on the exhaust hole 30d side). For this reason, the gas pressure in the case 16 acts on the tapered surface of the valve body 32 on the through hole 20a side. The valve body 32 contracts when receiving a gas pressure equal to or higher than a predetermined pressure, and forms a gap with the side surface portion 30 a of the cap 30. Thereby, the space in the case 16 and the exhaust hole 30d communicate. This state is a valve open state.

  The cap 30 is provided with a planned fracture portion 35 that is formed slightly thinner than the side surface portion 30a. The planned fracture portion 35 is broken when an excessive gas pressure acts on the valve body 32 and a pressure corresponding to the gas pressure acts on the end surface portion 30 b of the cap 30 via the valve body 32. The gas pressure at the time when the planned breakage portion 35 breaks is higher than the pressure at which the valve body 32 is elastically deformed to open the valve. In other words, when a predetermined pressure higher than the valve opening pressure is generated in the case 16, the safety valve 22 breaks the planned break portion 35 and expands the gas discharge path. Since the planned fracture portion 35 is arranged on the tip side of the side surface portion 30a of the cap 30 with respect to the large diameter portion 32a of the valve body 32, the elastic force of the valve body 32 is applied to the planned fracture portion 35. Although it becomes difficult to act | operate, it is not restricted to this, You may arrange | position to the base end side rather than the place where the large diameter part 32a contacts.

  The connection terminal 24 is disposed at a position displaced from the center of the sealing plate body 20. In other words, the connection terminal 24 is disposed at a position different from the safety valve 22 in the sealing plate body 20. Although the example in which the connection terminal 24 is formed integrally with the sealing plate body 20 is shown, the connection terminal 24 may be fixed to the sealing plate body 20 by welding.

  The connection terminal 24 is thicker than the sealing plate main body 20 and is integrally formed with the sealing plate main body 20, and a screw portion 24 b protruding from the sealing plate main body 20 to the outside in the longitudinal direction of the case main body 12. have. The screw portion 24 b is formed of a male screw, and the connection terminal 24 has a tip end surface of the screw portion 24 b protruding in the longitudinal direction of the case body 12 by a predetermined length from the end surface portion 30 b of the cap 30. The predetermined length is a length equal to or greater than the thickness of the connection member (bus bar) 38 (see FIG. 4) coupled to the connection terminal 24. With this configuration, the connection member 38 connected to the connection terminal 24 is less likely to interfere with the cap 30.

  As shown in FIG. 4, the sealed battery 10 can constitute an assembled battery 40 by being connected to another sealed battery 10 via a connection member 38. That is, the assembled battery 40 includes a plurality of sealed batteries 10, and these batteries 10 are electrically connected to each other by the connection member 38. In the assembled battery 40, the sealed batteries 10 are arranged side by side, that is, along the direction parallel to the sealing plate body 20. Therefore, even if a gas is ejected from one sealed battery 10 through the exhaust hole 30d, the gas can be prevented from directly reaching the adjacent sealed battery 10. Therefore, it is possible to suppress similar burning to the adjacent battery 10.

  In the assembled battery 40 of FIG. 4, both the sealed batteries 10 are arranged in the same direction, and the connecting members 38 that connect the positive terminal of one battery 10 and the negative terminal of the other battery 10 are two places in the length direction. It is formed in a bent shape.

  In addition, the structure of the assembled battery 40 is not restricted to this, The both sealed batteries 10 are good also as a structure arrange | positioned mutually reversely. In this case, since the positive terminal of one battery 10 and the negative terminal of the other battery 10 are close to each other, the connecting member 38 can be formed short. The assembled battery 40 is not limited to the combination of the two sealed batteries 10, and may have a configuration including three or more sealed batteries 10.

  As described above, according to the present embodiment, since the connection terminal 24 is provided in the sealing plate body 20 at a position different from the safety valve 22, the cap 30 needs to have strength for fixing the connection member 38. There is no. For this reason, the exhaust hole 30 d can be provided in the end surface portion 30 b of the cap 30. Since the exhaust hole 30d is provided in the end surface portion 30b of the cap 30, when the gas is generated in the case main body 12 and the safety valve 22 is opened for some reason, the gas is supplied to the end surface portion of the cap 30. It ejects from 30b in the direction perpendicular to the sealing plate body 20. For this reason, when a plurality of sealed batteries 10 are arranged so as to be aligned along the direction of the sealing plate body 20, the flame may directly reach the adjacent battery 10 even if the flame is ejected when the gas is ejected. Since it is suppressed, the burning to the adjacent battery 10 can be suppressed.

  Further, in the present embodiment, since the cap 30 has the structure to be broken, the gas can be exhausted by the valve opening operation by the valve body 32, and when excessive gas is generated. The gas can be exhausted when the planned fracture portion 35 is broken. That is, two-stage exhaust according to the generated gas pressure is possible. Thereby, it is possible to effectively cope with abnormal gas pressure increase.

  Further, in the present embodiment, since the planned fracture portion 35 is formed on the side surface portion 30a of the cap 30, when an excessive gas pressure is generated, the planned fracture portion 35 on the side surface of the cap 30 breaks and gas is generated. It ejects in a direction perpendicular to the sealing plate body 20. Even in this case, the direction in which the gas is ejected by the side surface portion 30 a of the cap 30 is restricted to the direction perpendicular to the sealing plate body 20. In addition, since the side surface portion 30 a of the cap 30 is broken, the opening area can be increased as compared with the mode in which the planned fracture portion 35 is provided on the front end surface of the cap 30.

  Moreover, in this embodiment, since the connection terminal 24 is integrally molded with the sealing plate main body 20, it is not necessary to weld and fix the connection terminal 24 to the sealing plate main body 20.

  In the present embodiment, since the connection terminal 24 is disposed at a position displaced from the center of the sealing plate main body 20, the torque generated when the connection member 38 is fastened to the connection terminal 24 is generated by the case main body 12 and the sealing plate main body. It can suppress acting on the caulking part with 20.

  In the present embodiment, since the tip end surface of the connection terminal 24 protrudes from the end of the case body 12, a short circuit occurs when the connection member (bus bar) 38 connected to the connection terminal 24 contacts the case body 12. This can be prevented.

  In the present embodiment, since the distal end surface of the connection terminal 24 protrudes beyond the distal end surface of the cap 30, it is avoided that the direction of the connection member (bus bar) 38 connected to the connection terminal 24 is restricted by the cap 30. can do.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the safety valve 22 is disposed at the central portion of the sealing plate main body 20 and the connection terminal 24 is disposed at a position shifted from the central portion. It is good also as a structure arrange | positioned in the center part of the sealing board main body 20, and the safety valve 22 being arrange | positioned from the center part of the sealing board main body 20. FIG.

  Moreover, although the said embodiment demonstrated the example in which the sealed battery 10 was comprised as a cylindrical battery, it is not restricted to this, For example, it is good also as a square battery.

  In the above-described embodiment, the connection terminal 24 includes the screw portion 24b. Instead, the base portion 24a is a pedestal portion protruding in a prismatic shape, and the connection member 38 is welded to the upper surface of the pedestal portion. It is good also as a structure.

  Moreover, in the said embodiment, although the structure where the fracture | rupture planned part 35 was provided in the side part 30a of the cap 30 was shown, it replaces with this and the fracture | rupture scheduled part 35 may be provided as the structure provided in the end surface part 30b of the cap 30. Good. In the case of this configuration, when an excessive gas pressure is generated, the planned fracture portion 35 of the end surface portion 30b of the cap 30 is broken, so that the gas is more easily ejected in a direction perpendicular to the sealing plate body 20. . Therefore, it becomes easy to suppress similar burning to the adjacent battery 10. Since the cap 30 is not required to have strength, the planned fracture portion 35 can be provided on the end surface portion 30 b of the cap 30. When the planned fracture portion 35 is provided on the end surface portion 30b, the planned fracture portion 35 may be provided on the outer peripheral side of the exhaust hole 30d or may be provided on the inner peripheral side.

  In the embodiment, the sealing plate 14 is caulked to the case main body 12, but the sealing plate 14 may be welded to the case main body 12.

  Moreover, although the example which formed the valve body 32 with rubber | gum was shown in the said embodiment, as shown in FIG. 5, the valve body 32 may be comprised by the spring member 42 which consists of a coil spring. In this configuration, the spring member 42 is housed in a state of being compressed between the end surface portion 30 b of the cap 30 and the sealing plate body 20. A presser plate 44 is interposed between the valve body 32 and the sealing plate body 20 so as to close the through hole 20a. When the pressure plate 44 is pressed at a pressure equal to or higher than a predetermined pressure, the spring member 42 is contracted and the valve is opened. Although FIG. 5 shows a configuration in which the planned fracture portion 35 is provided on the end surface portion 30 b of the cap 30, the planned fracture portion 35 may be provided on the side surface portion 30 a of the cap 30.

  In the above-described embodiment, the valve body 32 is switched between the valve open state and the valve closed state in the valve chamber 34, while the planned fracture portion 35 is provided in the cap 30. is not. For example, as shown in FIG. 6, the valve body 32 may be disposed so as to block the inside of the valve chamber 34, and the planned fracture portion 36 may be provided in the valve body 32. In this configuration, the valve body 32 is formed in a flat plate shape, and is sandwiched and fixed between the cap 30 and the sealing plate body 20. In the valve body 32, when an excessive gas pressure is applied, the planned breakage portion 36 is broken. However, if the pressure is lower than that pressure, even if a pressure higher than the predetermined pressure is applied, the valve body 32 is not opened. do not do. Further, in the example shown in FIG. 6, the fracture portion 35 is also provided on the side surface portion 30 a of the cap 30. The planned fracture portion 35 is fractured when a gas pressure higher than that of the planned fracture portion 36 of the valve body 32 is applied. Therefore, two-stage exhaust is also possible in the example of FIG. The planned fracture portion 35 may be formed on the end surface portion 30a of the cap 30, and the planned fracture portion 36 of the valve body 32 or the planned fracture portion 35 of the cap 30 may be omitted. Even in this configuration, since the exhaust hole 30d is formed in the end surface portion 30b of the cap 30, it is effective in preventing similar burning.

  In the embodiment, the configuration in which one connection terminal 24 is provided has been described. However, two connection terminals 24 may be provided as shown in FIG. 7, or three or more connection terminals 24 may be provided. Also good.

  Further, as shown in FIG. 8, a through hole 38 a may be formed in the connection member 38 at a position corresponding to the position of the exhaust hole 30 d of the cap 30. That is, a battery with a connection member provided with a sealed battery 10 and a connection member 38 for electrically connecting the sealed battery 10 to another sealed battery 10. The through hole 38 a may be formed so as to be in a position corresponding to the exhaust hole 30 d of the cap 30 in a state where it is connected to the terminal 24. The connection member 38 is formed with a fastening hole 38 b that is fastened to the connection terminal 24, and the distance between the fastening hole 38 b and the through hole 38 a is equal to the distance between the cap 30 and the connection terminal 24. The connecting member 38 may have a width larger than the outer diameter of the cap 30. When the connection member 38 is disposed so as to pass over the cap 30, the cap 30 can be desired from above through the through hole 38a.

  In this aspect, it is also possible to connect the connection member 38 to the sealed battery 10 in a posture in which the connection member 38 is positioned above the front end surface of the cap 30. That is, it is possible to increase the degree of freedom in the direction of the connecting member 38 while ensuring a passage for ejecting gas in a direction perpendicular to the sealing plate body 20.

  In the above-described embodiment, the front end surface of the connection terminal 24 protrudes from the front end surface of the cap 30. Instead, the front end surface of the cap 30 is the front end of the connection terminal 24 as shown in FIG. It is good also as a structure which protruded from the surface. In this configuration, since the distal end surface of the cap 30 in which the exhaust hole 30d is formed is located at a position protruding from the distal end surface of the connection terminal 24, the connection member (bus bar) 38 is disposed in the path through which the gas is ejected. Can be avoided. Therefore, it becomes easy to design an exhaust path as a battery pack. FIG. 9 shows an example in which the connection terminal 24 is formed in a shape protruding from the sealing plate body 20 to the inside of the case 16 (on the side opposite to the side on which the cap 30 is attached) and has a screw portion 24b made of an internal thread. . In addition, it is not restricted to this, It is good also as a structure which has the thread part 24b which consists of an external thread with a back shorter than the height of the cap 30. FIG.

  Further, in the embodiment and various modifications, the planned fracture portion 35 can be omitted.

  In the above embodiment, an example using a cylindrical sealed battery in which the positive electrode and the negative electrode are not on the same end face has been described. However, the same applies to a rectangular sealed battery in which the positive electrode and the negative electrode are on the same end face. An effect can be acquired and the burning to the next battery can be suppressed.

It is sectional drawing which shows partially the sealed battery which concerns on embodiment of this invention. It is sectional drawing which expands and shows the cap periphery of the said sealed battery. It is a perspective view of the cap. It is a figure which shows roughly the assembled battery provided with the said sealed battery. FIG. 3 is a view corresponding to FIG. 2 for explaining a sealed battery according to another embodiment of the present invention. FIG. 3 is a view corresponding to FIG. 2 for explaining a sealed battery according to another embodiment of the present invention. It is sectional drawing of the sealing board of the sealed battery which concerns on other embodiment of this invention. FIG. 8 is a view corresponding to FIG. 7 for explaining a battery with a connecting member including a sealed battery according to an embodiment of the present invention. It is sectional drawing of the sealing board of the sealed battery which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Case main body 14 Sealing plate 20 Sealing plate main body 20a Through-hole 22 Safety valve 24 Connection terminal 24b Screw part 30 Cap 30a Side part 30b End surface part 30d Exhaust hole 32 Valve body 34 Valve chamber 35 Breaking plan part 38 Connection member 38a Through-hole

Claims (12)

A sealed battery comprising a case body having a shape in which one side is open, and a sealing plate for closing the opening of the case body,
The sealing plate is
A sealing plate body in which a through hole is formed;
A safety valve provided to cover the through hole;
A connection terminal provided on the sealing plate main body at a position different from the safety valve,
The safety valve has a cap that forms a valve chamber that communicates with the through-hole, and a valve body that is disposed in the valve chamber, and a sealed battery in which an exhaust hole is formed in a tip surface of the cap .   The sealed battery according to claim 1, wherein the cap has a planned breakable portion that can be broken by a gas pressure in the case body.   The sealed battery according to claim 2, wherein the planned fracture portion is formed on a tip surface of the cap.   The sealed battery according to claim 2, wherein the planned fracture portion is formed on a side surface of the cap.   The sealed battery according to claim 2, wherein the planned fracture portion is provided on the valve body.   The sealed battery according to claim 1, wherein the connection terminal is formed integrally with the sealing plate body. The sealing plate body is formed in a circular shape and is caulked to the case body,
The safety valve is disposed in the center of the sealing plate body,
The sealed battery according to any one of claims 1 to 6, wherein the connection terminal has a threaded portion and is disposed at a position displaced from a center of the sealing plate body.   The sealed battery according to claim 1, wherein a front end surface of the connection terminal protrudes from an end of the case body.   The sealed battery according to claim 1, wherein a front end surface of the cap protrudes from a front end surface of the connection terminal.   The sealed battery according to claim 1, wherein a front end surface of the connection terminal protrudes from a front end surface of the cap. A battery with a connecting member comprising: the sealed battery according to claim 10; and a connecting member for electrically connecting the sealed battery to another sealed battery,
The battery with a connection member, wherein the connection member has a through hole formed at a position corresponding to the position of the exhaust hole of the cap.   A plurality of the sealed batteries according to claim 1, wherein the sealed batteries are arranged along a direction parallel to the sealing plate body, and the plurality of sealed batteries are electrically connected to each other by a connecting member. Assembled battery.

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