CN203260661U

CN203260661U - Sealed battery

Info

Publication number: CN203260661U
Application number: CN2013202475167U
Authority: CN
Inventors: 原山贵司
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2013-05-09
Filing date: 2013-05-09
Publication date: 2013-10-30
Anticipated expiration: 2023-05-09

Abstract

The utility model provides a sealed battery. The sealed battery is provided with an electrode body, a box for containing the electrode body, a cover component for sealing an opening of the box, and a terminal structure arranged on the cover component, wherein the terminal structure comprises an internal terminal connected with the electrode body and an external terminal connected with the internal terminal; a first through hole is formed in the cover component, and a second through hole is formed in the external terminal; the internal terminal comprises a shaft part inserted in the first through hole and the second through hole, a flange formed at one end of the shaft part, and a riveting part formed at the other end of the shaft part; a first projection part projected out towards the inner side of the box is formed on the cover component, and is positioned between the end of the cover component in the long side direction and the first through hole close to the end.

Description

Sealing cell

Technical field

The utility model relates to a kind of sealing cell.

Background technology

In the prior art, there has been the sealing cell that is installed in hybrid vehicle or the electric motor car.For example, a kind of battery component that possesses battery unit and accommodate the battery case of battery unit is disclosed in the patent documentation 1.Battery case is made of the open case shape battery case main body of end face and tabular lid that electrode is installed.Electrode has metal terminal and rivet.Rivet is fixed on metal terminal on the lid, and makes between metal terminal and the battery unit and realize being electrically connected.

Yet there is following problems in above-mentioned patent documentation 1 disclosed battery component.That is, when being fixed in rivet on the lid with riveting method, tabular lid might deform, in case and lid deforms, then be difficult to lid is welded on the battery case main body.

[patent documentation 1]: TOHKEMY 2008-192552 communique.

The utility model content

In order to solve the problems of the technologies described above, the purpose of this utility model is, a kind of sealing cell that the lid member deforms can prevent from riveting the time is provided.

As the technical scheme that solves the problems of the technologies described above, the related sealing cell of the utility model possesses electrode body, accommodate the lid member of opening of the box body of electrode body, enclosed box body and the terminal structure that arranges at the lid member.Terminal structure comprises, the internal terminal that is connected with electrode body, and the outside terminal that is connected with internal terminal.Be formed with the first through hole on the lid member, be formed with the second through hole on the outside terminal.Internal terminal comprises, the flange that is inserted in axial region in the first through hole and the second through hole, forms at an end of this axial region, and the caulking part that forms at the other end of axial region.Lid is formed with the first side-prominent protuberance in the box body on the member, and the first protuberance is between the end of the long side direction of lid member and the first through hole that closely is close to this end.

Have the sealing cell of said structure owing to be provided with the first protuberance, thus the rigidity (mechanical strength) of lid member be improved, thereby the lid member deforms in the time of can preventing from internal terminal riveted.

In addition, in above-mentioned sealing cell, can be to be formed with the second side-prominent protuberance in the box body at the lid member, the second protuberance is between the centre position and the first through hole of the long side direction of lid member.

Have the sealing cell of said structure owing to be provided with the second protuberance, thus the rigidity (mechanical strength) of lid member be improved, thereby the lid member deforms in the time of can preventing from internal terminal riveted.

In addition, in above-mentioned sealing cell, can be that the first protuberance is configured on the position corresponding with the end of electrode body.

Advantage with sealing cell of said structure is, when being welded to internal terminal on the electrode body, will cover easily the position alignment of member and electrode body.

Description of drawings

Fig. 1 is the integrally-built sectional view of the sealing cell of expression present embodiment.

Fig. 2 is the sectional view that enlarges the terminal structure of the sealing cell in the presentation graphs 1.

Fig. 3 is the sectional view that the state the when internal terminal in the terminal structure of sealing cell is welded to the anodal extension of electrode body is shown.

Embodiment

Below, with reference to accompanying drawing execution mode of the present utility model is described.

As the sealing cell 100 of a kind of execution mode of the present utility model as shown in Figure 1, possess: as the metal lid member 3 of the peristome 2a of the electrode body 1 of generating element, the metal box body 2 of accommodating electrode body 1, enclosed box body 2 and be arranged on the pair of terminal structure 4 of covering on the member 3.Sealing type battery 100 for example is the secondary cell that can carry out charging and discharging.Box body 2 and lid member 3 consist of the battery case of sealing cell 100.

Electrode body 1 be by with positive plate and negative plate behind the barrier film lamination, laminate reeled to be obtained, and it comprises: the core 1a that positive plate, negative plate and membrane winding are obtained, the side of core 1a only be wound with positive plate anodal extension 1b, and only be wound with the negative pole extension 1c of negative plate at the opposite side of core 1a.Be coated with respectively active material on the core 1a of positive plate and negative plate, the upper uncoated active material of the anodal extension 1b of positive plate and the negative pole extension 1c of negative plate.

What box body 2 was formed peristome 2a has a bottom tube-like body, and overlooks and be rectangle.Electrode body 1 and electrolyte are being accommodated in the inside of box body 2.Lid member 3 is formed tabular, and overlooks and be rectangle.Lid member 3 is welded on the box body 2, with the peristome 2a of enclosed box body 2.Be formed be used to a pair of through hole 3a that terminal structure 4 is connected with electrode body 1 on the lid member 3.At this, through hole 3a is an example of " the first through hole " of the present utility model.

In the pair of terminal structure 4, a side terminal structure 4 is connected with the anodal extension 1b of electrode body 1, and the opposing party's terminal structure 4 is connected with the negative pole extension 1c of electrode body 1.Two-terminal structure 4 is configured in respectively near the end of the long side direction (directions X) that covers member 3.As shown in Figure 2, terminal structure 4 comprises: outside terminal 41, bolt 42, insulator 43, internal terminal (collector terminal) 44, and pad 45.

Outside terminal 41 is configured in the outside of covering member 3, and is formed and has the tabular of step.Be formed with through

hole

41a and 41b on the outside terminal 41.At this, through hole 41b is an example of " the second through hole " of the present utility model.Bolt 42 is inserted among the through hole 41a of outside terminal 41, is electrically connected with outside terminal 41.Bolt 42 is used for making between sealing cell 100 and other the sealing cell etc. and is connected by bus bar (not shown).

Insulator 43 is configured in and covers between member 3 and outside terminal 41 and the bolt 42, is used for making covering electric isolation the between member 3 and outside terminal 41 and the bolt 42.Be formed with recess 43a and through hole 43b on the insulator 43.Disposing the head of bolt 42 among the recess 43a.Through hole 43b is formed concentric with the through hole 41b of outside terminal 41 and concentric with the through hole 3a of lid member 3.

Internal terminal 44 is used for making between outside terminal 41 and anodal extension 1b or the negative pole extension 1c to be realized being electrically connected.This internal terminal 44 is installed in by riveted joint and covers on the member 3, has outside terminal 41 is fixed on the function of covering on the member 3.Particularly, internal terminal 44 has axial region 44a, flange 44b, caulking part 44c, reaches connecting portion 44d.

Axial region 44a be inserted in through hole 41b, the insulator 43 of outside terminal 41 through hole 43b, and cover among the through hole 3a of member 3.End (being positioned at the end of the inboard of covering member 3) at axial region 44a is formed with flange 44b.Flange 44b is formed from the outer peripheral face of axial region 44a to radially expansion.The other end (being positioned at the end in the outside of covering member 3) at axial region 44a is formed with caulking part 44c.By pounding caulking part 44c that flat distortion forms from the outer peripheral face of axial region 44a to radially expansion.Connecting portion 44d is formed, from flange 44b to anodal extension 1b or negative pole extension 1c extend.And connecting portion 44d is welded on anodal extension 1b or the negative pole extension 1c.

Pad 45 is used for the through hole 3a of seal cover member 3, and makes and cover electric isolation the between member 3 and the internal terminal 44.Pad 45 comprises: be configured in main part 45a between the flange 44b that covers member 3 and internal terminal 44, the cylindrical portion 45b that forms in the middle of main part 45a, and the protuberance 45c that forms in the outer peripheral edges of main part 45a.Main part 45a is in by the state of

flange

44b and 3 compressions of lid member, and it presses to internal terminal 44 inboard of covering member 3.Cylindrical portion 45b is inserted among the through hole 3a that covers member 3, and the axial region 44a of internal terminal 44 is inserted among this cylindrical portion 45b.That is, cylindrical portion 45b is configured between the outer peripheral face of the inner peripheral surface of through hole 3a and axial region 44a.Protuberance 45c is enclosed within on the flange 44b of internal terminal 44.

Example as the manufacture method of sealing cell 100, at first, by being riveted, lid member 3 forms pair of terminal structure 4, then, the connecting portion 44d that is installed in the internal terminal 44 that covers on the member 3 is welded on the electrode body 1, secondly, with electrode body 1 box body 2 of packing into, so that the state of the peristome 2a of lid member 3 enclosed box body 2 will cover member 3 and be welded on the box body 2.That is, pushing down from the outside under the state of the mid portion that covers member 3 with tool (not shown), be welded to the end of long side direction of lid member 3 on the box body 2 after, the end that will cover again the short side direction of member 3 is welded on the box body 2.

In the sealing cell 100 of present embodiment, the inner face of lid member 3 is formed with the first interior side-prominent protuberance 3b to box body 2, and this first protuberance 3b is positioned at the side away from the centre position of the long side direction (directions X) of lid member 3 of through hole 3a.Therefore, as shown in Figure 1, the first protuberance 3b is formed on respectively the outside of a pair of through hole 3a.That is, the first protuberance 3b is formed between the end of the long side direction that covers member 3 and the through hole 3a that closely is close to this end.In addition, the first protuberance 3b is formed, and is outstanding towards the bottom surface direction of box body 2 from the inner face of lid member 3.And the first protuberance 3b is formed, and for example the short side direction (perpendicular to the direction of the paper of Fig. 1) to lid member 3 extends.At this, the first protuberance 3b forms with lid member 3.But the first protuberance 3b uses the material different from covering member 3 to be installed to after making to cover on the member 3.At this, between the end of the long side direction of lid member 3 and the through hole 3a that closely is close to this end, be provided with first a protuberance 3b.But also can between the end of the long side direction of lid member 3 and the through hole 3a that closely is close to this end, a plurality of the first protuberance 3b be set.

So, by at the interior side-prominent first protuberance 3b of formation between the end of the long side direction of lid member 3 and the through hole 3a that closely is close to this end to box body 2, can improve the rigidity (mechanical strength) of covering member 3, thus the outside distortion of the through hole 3a of lid member 3 in the time of can preventing from internal terminal 44 riveted.Thereby, can solve be difficult to lid member 3 be welded on the box body 2, maybe will cover member 3 be welded on the box body 2 after the problem of sealing property reduction.

In addition, in the time will covering member 3 and be welded on the box body 2, push down the middle part of covering member 3 from the outside with tool, so, if between a pair of through hole 3a, deform, can also correct, if but deform in the outside of through hole 3a, then be difficult to correct.Thereby at arranged outside the first protuberance 3b of through hole 3a, the outside that is effective in especially the through hole 3a that prevents from covering member 3 deforms.

In addition, be formed with the second interior side-prominent protuberance 3c to box body 2 at the inner face of lid member 3, this second protuberance 3c is positioned at the side by the centre position of the long side direction that covers member 3 of through hole 3a.That is, the second protuberance 3c be formed on respectively the inboard of a pair of through hole 3a, closely being close to of through hole 3a.In other words, the second protuberance 3c is formed on respectively between the centre position and through hole 3a of the long side direction that covers member 3.In addition, the second protuberance 3c is formed, and is outstanding towards the bottom surface direction of box body 2 from the inner face of lid member 3.At this, the second protuberance 3c in the length of directions X greater than the length of the first protuberance 3b at directions X.But the second protuberance 3c also can be less than the length of the first protuberance 3b at directions X in the length of directions X.In addition, the second protuberance 3c is formed, and for example the short side direction (perpendicular to the direction of the paper of Fig. 1) to lid member 3 extends.At this, the second protuberance 3c forms with lid member 3.But the second protuberance 3c uses the material different from covering member 3 to be installed to after making to cover on the member 3.At this, between the centre position of long side direction of lid member 3 and through hole 3a, be provided with second a protuberance 3c.But also can between the centre position of long side direction of lid member 3 and through hole 3a, a plurality of the second protuberance 3c be set.

So, by formation between centre position and the through hole 3a of the long side direction of lid member 3 to the second interior side-prominent protuberance 3c of box body 2, can improve the rigidity (mechanical strength) of covering member 3, thus the situation that the inboard of the through hole 3a of lid member 3 deforms in the time of can preventing from internal terminal 44 riveted.Thereby, can solve be difficult to lid member 3 be welded on the box body 2, maybe will cover member 3 be welded on the box body 2 after the problem of sealing property reduction.

In addition, as shown in Figure 2, in the present embodiment, the first protuberance 3b is configured in, on the side 3d of its outside (by a side of the end of the long side direction that covers member 3) and the position that the end 1d of the long side direction of electrode body 1 aligns.That is, the end 1d of electrode body 1 is positioned on the extended line that the bottom surface direction from the side 3d of the first protuberance 3b to box body 2 extends.In addition, the end 1d of electrode body 1 is alignd at directions X with the end of the connecting portion 44d of internal terminal 44.

So, by the first protuberance 3b is configured on the position corresponding with the end 1d of electrode body 1, as shown in Figure 3, when the connecting portion 44d with internal terminal 44 is welded on anodal extension 1b or the negative pole extension 1c, the enough tools 50 of energy will cover the position alignment of member 3 and electrode body 1.Thereby, can cover under the parallel state of member 3 and electrode body 1 making, connecting portion 44d is welded on anodal extension 1b or the negative pole extension 1c.Otherwise, if under the state of electrode body 1 relative lid member 3 deflections, weld, then load can be applied on the direction that makes internal terminal 44 deflections (make with cover the relative member 3 that covers of axial region 44a that member 3 vertically disposes produce the direction of inclination), it is unbalanced that thereby the pressure that makes compression gasket 45 occurs, and causes sealing property to reduce.And adopt the structure of above-mentioned present embodiment, just can avoid the problems referred to above to occur.

Claims

1. sealing cell, possesses electrode body, accommodate the box body of this electrode body, seal the lid member of the opening of this box body, and the terminal structure that arranges at this lid member, described terminal structure comprises the internal terminal that is connected with described electrode body, and the outside terminal that is connected with this internal terminal, be formed with the first through hole on the described lid member, be formed with the second through hole on the described outside terminal, described internal terminal comprises, be inserted in the axial region in described the first through hole and described the second through hole, the flange that forms at an end of this axial region, and at the caulking part that the other end of this axial region forms, it is characterized in that:

Be formed with the first side-prominent protuberance in the described box body on the described lid member, between described the first through hole that this first protuberance closely is close in end and this end of the long side direction of described lid member.

2. sealing cell as claimed in claim 1 is characterized in that:

Be formed with the second side-prominent protuberance in the described box body at described lid member, this second protuberance is between the centre position and described the first through hole of the long side direction of described lid member.

3. sealing cell as claimed in claim 1 or 2 is characterized in that:

Described the first protuberance is configured on the position corresponding with the end of described electrode body.