JP2004227926A - Sealed type secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed type secondary battery in which tightening torque of the electrode post is reduced. <P>SOLUTION: This is a sealed type secondary battery that comprises a secondary battery 12 having a gas discharge part and capable of charge and discharge, a case 11 having a housing part 11e which is provided with an insertion port 11d, through which the secondary battery 12 is housed, and a holder 20 that closes the insertion port. A holder side tightening part 20a provided at the holder 20 and a case side tightening part 11c provided at the case 11, and an energized projection 19d that is provided on the face opposed to the housing part 11e of the holder 20 are installed, and by tightening the holder side tightening part 20a and the case side tightening part 11c, the secondary battery 12 is energized and supported by the energized projection 19d to the housing part 11e. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealed secondary battery in which a secondary battery is provided in a case.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as means for holding a secondary battery in a battery case, a means disclosed in Patent Document 1 is known.
[0003]
This is achieved by filling a gap between a plurality of power generating elements (secondary batteries) and a battery case with a foamed resin as an insulating filler, and fixing the terminal provided with a screw thread to the battery case with a nut. It is possible to suppress displacement or movement of the power generating element in the battery case.
[0004]
[Patent Document 1]
JP-A-2002-321297
[Problems to be solved by the invention]
However, when a foamed resin material is used for the insulating filler, it is difficult to dispose the power generating element at an accurate position. In addition, since the power generating element is relatively heavy, in order to prevent movement and displacement of the power generating element in the battery case when the power generating case is subjected to vibration or impact, while compressing the insulating filler, Since the terminal had to be fixed to the battery case with a nut, excessive tightening torque was applied to the terminal.
[0006]
However, a relatively soft metal such as copper or aluminum is often used for the poles (terminals) of the secondary battery, and when an excessive tightening torque is applied to the terminals, the terminals expand and deform. There was a possibility.
[0007]
Then, this invention is made in order to solve the said subject, and an object of this invention is to provide the sealed secondary battery which can reduce the tightening torque with respect to a pole.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a chargeable / dischargeable secondary battery provided with a gas release portion, a case provided with an insertion port, and a storage portion through which the secondary battery is stored, A sealed secondary battery including a holder for closing an insertion port, wherein the holder-side fastening portion provided in the holder, the case-side fastening portion provided in the case, and the storage portion of the holder are opposed to each other. An urging projection provided on the surface, and by fastening the holder-side fastening part and the case-side fastening part, the secondary battery is urged and held by the housing by the urging projection. .
[0009]
In this sealed secondary battery, the displacement of the secondary battery in the case can be prevented without applying excessive tightening torque to the poles of the secondary battery.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a perspective view showing a sealed secondary battery according to an embodiment of the present invention, FIG. 2 is a perspective view of a holder used for the battery, FIG. 3 is a cross-sectional view of a main part of the battery, and FIG. 5 is a perspective view showing a state before the lid of the battery is attached, FIG. 5B is a perspective view showing a state where the lid is attached, and FIG. 6 is a rubber constituting the holder 20 of the sealed secondary battery 10. FIG. 3 is a perspective view of a packing 19.
[0012]
As shown in FIG. 1 and FIGS. 5 (a) and 5 (b), the sealed secondary battery 10 has an opening 11d on the upper surface serving as an insertion port, and a base as a resin case having open front and rear surfaces. 11, a plurality of lithium ion batteries (secondary batteries) 12 having positive and negative poles 15 and 16 mounted on a storage portion 11e on a rectangular plate-shaped base body 11a of the base 11, and a plurality of lithium batteries A synthetic resin holder 20 that holds the upper part of the ion battery 12 via a rubber packing 19 to form a sealed space K therein, and a synthetic resin spacer 30 so as to close the gas outlet 26 of the holder 20. A rubber duct 40 that is attached via the air and exhausts the gas G generated in each lithium ion battery 12 and one end of which is connected to the positive and negative poles 15 and 16 of the lithium ion battery 12 at both ends. , The other end and a pair of bus bars 50 and 51 projecting outwardly from the inside of the holder 20 and the like.
[0013]
As shown in FIG. 3, each lithium ion battery 12 includes a metal container 13 having an open upper surface, a metal plate lid 14 which is fixed to the opening 13 a of the battery container 13 in a sealed state by welding. have. A positive electrode plate, a negative electrode plate, and a separator (separator) (not shown) are housed and fixed in the battery case 13. On both sides of the lid 14, a positive pole 15 made of aluminum and a negative pole 16 made of copper are attached. Further, an elliptical thin portion 17 is formed in the center of the lid 14 as a gas discharge portion for exhausting the gas inside the battery case 13 to prevent the gas from becoming high when the pressure inside the battery case 13 rises. I have. In addition, predetermined bus bars 50, 51, 52 are respectively connected to the poles 15, 16 of each lithium ion battery 12 via nuts 18. Further, as shown in FIG. 1, the positions of the poles 15 and 16 of each of the adjacent lithium ion batteries 12 are alternately arranged.
[0014]
As shown in FIGS. 1 and 2, the holder 20 is formed of a synthetic resin in a substantially rectangular frame shape, and has an opening 22 substantially at the center of the upper surface 21 a of the peripheral wall 21. As shown in FIG. 3, the opening 22 of the holder 20 is covered with a lid 29 made of a metal plate, and a peripheral wall 21 of the holder 20, a bottom wall 23 sealed with a rubber packing 19, and a lid A closed space K is formed inside the body 29 together with the body 29. An annular fitting groove 21b is formed on the upper surface 21a of the peripheral wall 21 of the holder 20.
An annular lid seal portion 45 integrally formed with a rubber duct 40 described later is fitted into the fitting groove 21b. The sealed state of the sealed space K is maintained by the lid seal portion 45 and the rubber packing 19.
[0015]
Further, on both sides of the bottom wall 23 of the holder 20 (positions facing the poles 15 and 16), storage portions 24a, 24b and 24c for storing the bus bars 50, 51 and 52 are provided via the partition walls 24. It is integrally formed. A through-hole 23a through which the poles 15, 16 pass is formed in the bottom wall 23 between the storage portions 24a, 24b, 24c. A pair of partition walls 25, 25 are integrally formed at the center of the bottom wall 23 of the holder 20, and a predetermined position of the bottom wall 23 between the pair of partition walls 25, 25 (for each lithium ion battery 12). A plurality of ventilation holes 23b are formed in the lid 14 at a position facing the thin portion 17).
[0016]
As shown in FIGS. 1 and 2, a rectangular gas outlet 26 is formed on one side of the peripheral wall 21 of the holder 20. A plurality of concave portions (engaging portions) 26 a having a circular cross section are formed on the bottom surface of the gas outlet 26. Further, bus bar outlets 27a and 28a are formed at the corners on the other side of the peripheral wall 21 of the holder 20. A fusible link mounting portion 27 is integrally formed outside the one bus bar outlet 27a, and a service plug mounting portion 28 is integrally formed outside the other bus bar outlet 28a.
[0017]
As shown in FIG. 2, each partition wall 24, 25 of the holder 20 is formed so as to be gradually lower than the upper surface 21a of the peripheral wall 21 toward the gas outlet 26 side. The gas G generated inside 12 is easily discharged to the gas outlet 26 side. Further, at least four columns 24d higher than the upper surface 21a of the peripheral wall 21 are formed integrally with each partition wall 24, and the upper end of each column 24d has a lower surface 29a of the lid 29 as shown in FIG. Is in contact.
[0018]
As shown in FIG. 1, each pair of flanges 11c, 11c of both sides 11b, 11b integrally projecting upward from both sides of the base body 11a as a case-side fastening portion of the base 11, and the holder 20 is fastened to the holder 20. The portion 20a is fastened and fixed via a bolt 55 and a nut 56. As shown in FIG. 1, the positive and negative poles 15 and 16 of each adjacent lithium ion battery 12 are connected to the bus bar 52 and the nut 18. Further, as shown in FIG. 3, the sealed secondary battery 10 is housed under a seat 60 of an automobile, for example. Further, an auxiliary duct 40D is connected to an opening 40d on the other end side of the rubber duct 40, and the auxiliary duct 40D extends below the floor panel 61.
[0019]
As shown in FIGS. 3, 4 and 6, the rubber packing 19 surrounds the periphery of the thin portion 17 on the back side 19 ′ of the rubber packing 19 as a surface facing the storage portion 11 e, and has a tip portion. A sealing rib 19a made of an elastic material is provided which is biased and held so as to fall toward the thin portion 17. In addition, an insulating rib 19b is provided on the back side 19 'of the rubber packing 19 between the lithium ion batteries 12 and along the side surface. Further, a welding portion 12b of the battery case 13 and the lid 14 of the lithium ion battery 12 is located between the sealing rib 19a and the lip 19c at the tip of the insulating rib 19b. The lip 19c is provided so as to be held in contact with the lip 19c.
[0020]
A biasing projection 19d is provided on the rear side 19 'of the rubber packing 19, and a pair of flanges 11c of both sides 11b, 11b integrally projecting upward from both sides of the base body 11a of the base 11. When the fastening is fixed between the holder 11 and the holder 20 via the bolts 55 and the nuts 56, the urging projections 19d are compressed by the rubber packing 19 being held between the respective lithium ion batteries 12 and the holder 20. The lithium ion batteries 12 are held in the storage portion 11e without rattling due to the compression reaction force of the urging projections 19d.
[0021]
In the rubber packing 19, auxiliary ribs 19f are formed inside the sealing ribs 19a so as to surround the thin portions 17 through holes 19e through which the pole columns 15 and 16 pass.
[0022]
According to the sealed secondary battery 10 of the above-described embodiment, since the periphery of the thin portion 17 is sealed by the sealing rib 19a, the gas released from the thin portion 17 is prevented from leaking from a predetermined space to the outside. can do.
[0023]
Since the outer periphery of the lithium ion battery 12 is surrounded by the insulating rib 19b, even when vibration or impact is applied to the sealed secondary battery 10, the lithium ion battery 12 does not touch other surrounding members. , Short circuit can be prevented.
[0024]
Further, since the sealing rib 19a is biased and held so as to fall down toward the thin portion 17 while being sealed by the lip 19c, the gas generated inside the lithium ion battery 12 leaks from the welded portion 12b. Flows toward the thin portion 17, the gas can be kept in a predetermined space, and the gas can be prevented from leaking to the outside.
[0025]
In addition, in order to hold each lithium ion battery 12 in the storage portion 11e, the pole columns 15 and 16 are excessively large by fastening the holder-side fastening portion 20a and the flange portions 11c and 11c as case-side fastening portions. Since it is no longer necessary to hold the lithium ion battery 12 in the storage portion 11e by applying a tightening torque, when a relatively soft metal such as aluminum or copper is used for the poles, the poles 15 and 16 are electrically connected. Since a sufficient tightening torque is applied to make the connection, it is possible to prevent the displacement of the secondary battery in the case without deforming the poles 15 and 16.
[0026]
【The invention's effect】
As described above, according to the first aspect of the invention, it is possible to prevent displacement of the secondary battery in the case without applying excessive tightening torque to the pole of the secondary battery.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sealed secondary battery according to one embodiment of the present invention.
FIG. 2 is a perspective view of a holder used in the sealed secondary battery of the embodiment.
FIG. 3 is a sectional view of a main part of the sealed secondary battery according to the embodiment;
FIG. 4 is a cross-sectional view of a main part of the sealed secondary battery of the embodiment.
5A is a perspective view showing a state before the lid of the sealed secondary battery according to the embodiment is attached, and FIG. 5B is a state in which the lid is attached to the sealed secondary battery according to the embodiment; FIG.
FIG. 6 is a perspective view of a rubber packing constituting a holder of the sealed secondary battery according to the embodiment.
[Explanation of symbols]
10: sealed secondary battery 11: case (base)
11c: Case side fastening part (flange part)
11d ... insertion slot (opening)
11e Storage section 12 Secondary battery (lithium ion battery)
17 ... gas release part (thin part)
19d ... urging projection 20 ... holder 20a ... holder side fastening part

Claims (1)

A chargeable / dischargeable secondary battery with a gas release unit,
A case having an insertion port, and a storage section through which the secondary battery is stored,
A sealed secondary battery including a holder for closing the insertion port,
A holder-side fastening portion provided in the holder,
A case-side fastening portion provided in the case,
A biasing projection provided on a surface of the holder facing the storage portion,
A sealed secondary battery wherein the holder-side fastening portion and the case-side fastening portion are fastened so that the secondary battery is biased and held in the storage portion by a biasing projection.

Images