CN102339958B - Seal plate assembly for battery and battery having the same - Google Patents
Seal plate assembly for battery and battery having the same Download PDFInfo
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- CN102339958B CN102339958B CN201010237332.3A CN201010237332A CN102339958B CN 102339958 B CN102339958 B CN 102339958B CN 201010237332 A CN201010237332 A CN 201010237332A CN 102339958 B CN102339958 B CN 102339958B
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- panel assembly
- hush panel
- cover plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a seal plate assembly for a battery and a battery having the seal plate assembly. The seal plate assembly is formed by riveting an upper insulating strip, a cover plate, a lower insulating strip and a pad together through a rivet which doubles as electrode terminals and penetrates through the upper insulating strip, the cover plate, the lower insulating strip and the pad, wherein, the cover plate (4) is provided with a first recess (4a) in the center, the main part of the upper insulating strip (3) is embed in the first recess (4a). The seal plate assembly is characterized in that: extending outward from the peripheral edge of the main part of the upper insulating strip along with the upper surface of the cover plate (4), a flange (3c) is formed. According to the invention, external short circuit in the charge and discharge process of the battery can be effectively prevented, fire and explosion of the battery are avoided, and the safety of the battery is improved.
Description
Technical field
The present invention relates to a kind of battery hush panel assembly of ad hoc structure and possess the battery of this hush panel assembly.
Background technology
In recent years, along with popularizing rapidly of portable electric appts such as notebook computer, mobile phone, portable data assistance (PDA) etc., as its power supply, the exploitation that has high capacity density and be easy to the lithium rechargeable battery of miniaturization more and more comes into one's own.From lightweight, the viewpoint that is easy to carry about with one of portable electric appts, also require the thinner and miniaturization of cell thickness as its power supply.
In general, lithium rechargeable battery comprises: the hush panel assembly that have the battery case of peristome in upper end, peristome is sealed and be contained in electrode group and the electrolyte in battery case.Wherein, hush panel assembly be comprise rivet, upper portion insulating sheet, cover plate, bottom insulating trip and pad and by rivet by these parts assembly forming that is riveted together successively.And then adopt the mode of laser welding that hush panel assembly is connected with battery case, be assembled into lithium rechargeable battery.In hush panel assembly, aluminum cover plate and battery case are connected with positive pole, rivet is situated between and is connected with negative pole by pad, upper portion insulating sheet is by rivet and cover plate insulation, bottom insulating trip, by pad and cover plate insulation, is anodal form thereby form other positions except the rivet as negative terminal on cover plate.
For improve hush panel assembly assembling, avoid occurring the internal short-circuit of battery, aspect the structural design of hush panel assembly, descending many time at present.For example, in patent documentation 1, disclose the up-small and down-big rivet of a kind of diameter, can run through from bottom to up lithium ion battery cover board assembly, greatly reduced the difficulty of battery assembling.In addition, in patent documentation 2, disclose at the edge of one end of bottom insulating trip and be provided with projection, thereby avoided the negative wire connecting on pad contact with cover plate or battery container inwall and cause internal short-circuit of battery.
But, because the thickness of battery is more and more thinner, in the time that the hush panel assembly to battery and battery case carry out laser welding, distance between weld seam and the rivet of hush panel assembly is also more and more nearer, when this makes laser welding, laser is easily irradiated on insulating trip, thereby plastic insulating trip is deformed, and in charge and discharge process, rivet easily contacts with cover plate, causes the external short circuit of battery.In order to overcome this problem, in patent documentation 3, disclose around the rivet of hush panel assembly central portion inserts with hole the second recess has been set, the upper portion insulating sheet of insulating resin system is arranged to (referring to Fig. 1) in the second recess, thereby while avoiding laser welding, laser shines directly on the resin of insulating trip, has prevented to a certain extent the distortion of insulating resin.
In the battery of employing top lasers welding manner, due to close together between upper portion insulating sheet and the welding position of battery, even if laser does not shine directly on insulating trip, the heat that laser welding produces also may cause the fusing of insulating trip.Therefore; a kind of hush panel assembly is disclosed in patent documentation 4; it is provided with step on the side of the surrounding of metal substrate (cover plate); utilize this ledge structure; cover plate is partly built in battery case; can take like this side laser welding mode in surrounding welding, thereby the plastic insulation sheet on cover sheet is not by laser damage.
Except the above-mentioned safety issue of being brought by the distortion of insulating trip, another problem existing is at present, along with the development of battery miniaturization and slimming, the rivet that doubles as negative terminal becomes more and more less, and the safety issue in consequent charge and discharge process also becomes increasingly conspicuous.Particularly for square lithium ion secondary battery, in the time that the battery assembling is discharged and recharged, the mensuration terminal of charging/discharging apparatus is with respect to the slightly deviation of position of battery, just very easily cause and discharge and recharge terminal and contact with the cover plate as positive terminal with the rivet as negative terminal simultaneously, therefore there is most probably the external short circuit of battery, the performance that causes battery is bad, even causes the potential safety hazard such as battery-heating, blast on fire.
Patent documentation 1: Chinese utility model patent ZL200520034597.8
Patent documentation 2: Chinese utility model patent ZL200520036580.6
Patent documentation 3: TOHKEMY 2004-303739
Patent documentation 4: Chinese utility model patent ZL200520121499.8
Summary of the invention
The object of the invention is to provide a kind of battery hush panel assembly, and it can effectively prevent that battery from external short circuit occurring in charge and discharge process, avoids battery that blast on fire occurs, thereby has improved the fail safe of battery.In addition, the present invention also provides the battery that possesses above-mentioned hush panel assembly.
In order to achieve the above object, basic conception of the present invention is the upper portion insulating sheet that adopts ad hoc structure in hush panel assembly, specifically, a flange is set in the neighboring of upper portion insulating sheet, even if the mensuration terminal of charging/discharging apparatus occurs to be offset and also can not touch rivet and cover plate like this, thereby greatly reduces the incidence of external short-circuit of battery simultaneously.And by the upper portion insulating sheet of above-mentioned ad hoc structure is embedded in the recess of lid surface, upper portion insulating sheet is not yielding in the process of laser welding yet.
Battery of the present invention is that rivet by doubling as electrode terminal runs through successively upper portion insulating sheet, cover plate, bottom insulating trip and pad and they are riveted together and are formed with hush panel assembly, described cover plate is formed with the first recess at central portion, the main part of described upper portion insulating sheet is entrenched in this first recess, it is characterized in that, reach out to be formed with flange from the neighboring of described main part along the upper surface of described cover plate.
Preferred described flange is more than 1mm from the outward extending width in described neighboring on the thickness direction of battery, but does not exceed the edge of described cover plate in cell thickness direction.
The neighboring shape of preferred described flange is any shape in rectangle, round rectangle, circle, ellipse.
Preferred described cover plate is formed with shape second recess corresponding with described flange around described the first recess, and described flange is embedded in described the second recess.
More preferably, on the neighboring of described flange, be formed with perpendicular to the surface of flange the flange to upper process.
More preferably, the bottom of the side, edge of described cover plate is provided with the step caving inward.
More preferably, the bottom of the side, edge of described cover plate is provided with the step caving inward.
In addition, secondary cell of the present invention possesses: the hush panel assembly that have the battery case of peristome in upper end, described peristome is sealed and be contained in electrode group and the electrolyte in described battery case, it is characterized in that, described hush panel assembly is above-mentioned hush panel assembly.
Preferably in the time that the bottom of the side, edge of described cover plate is provided with the step caving inward, described step engages with the peristome of described battery case, together with the mode laser welding that described hush panel assembly is taked side welding with described battery case, weld seam is positioned at the position that described step engages with the peristome of described battery case.
According to the present invention, can effectively prevent that terminal touches rivet to battery simultaneously and external short circuit occurs cover plate owing to discharging and recharging at charge and discharge process, avoid battery that blast on fire occurs, improve the fail safe of battery.
Accompanying drawing explanation
Fig. 1 represents the longitudinal sectional drawing of the structure of hush panel assembly of the prior art.
Fig. 2 represents the longitudinal sectional drawing of the structure of the hush panel assembly of an embodiment of the invention.
Fig. 3 is the stereogram of the upper portion insulating sheet in the hush panel assembly of schematically presentation graphs 2.
Fig. 4 is the vertical view of the hush panel assembly shown in Fig. 2.
Fig. 5 represents the longitudinal sectional drawing of the structure of the hush panel assembly of another embodiment of the invention.
Fig. 6 represents the longitudinal sectional drawing of the structure of the hush panel assembly of another execution mode of the present invention.
Fig. 7 represents the longitudinal sectional drawing of the structure of the hush panel assembly of another execution mode of the present invention.
Fig. 8 represents the schematic diagram of the battery that possesses hush panel assembly of the present invention.
Symbol description
1 hush panel assembly
2 rivets
3 upper portion insulating sheets
The main part of 3a upper portion insulating sheet
3b neighboring
3c flange
3d flange
4 cover plates
4a the first recess
4b the second recess
4c step
5 bottom insulating trips
6 pads
7 steam vents (safety valve)
8 liquid injection port
9 battery cases
The peristome of 9a battery case
10 batteries
Embodiment
Below, come by reference to the accompanying drawings battery of the present invention hush panel assembly and the battery that possesses this hush panel assembly to be specifically described.But hush panel assembly of the present invention and battery are not limited to following specific embodiment.
< hush panel assembly >
(execution mode 1)
First, with reference to Fig. 2～Fig. 4, the battery of embodiments of the present invention 1 is described with the concrete form of hush panel assembly.
Fig. 2 is the longitudinal sectional drawing that represents the structure of the hush panel assembly 1 of an embodiment of the invention.Fig. 3 is the stereogram that schematically represents the upper portion insulating sheet 3 in this hush panel assembly 1.Fig. 4 is the vertical view of this hush panel assembly 1.
The battery of Fig. 2 comprises rivet 2, upper portion insulating sheet 3, cover plate 4, bottom insulating trip 5 and pad 6 with hush panel assembly 1, and by the rivet 2 that doubles as electrode terminal, upper portion insulating sheet 3, cover plate 4, bottom insulating trip 5 and pad 6 is riveted together and is formed successively.Cover plate 4 is formed with the first recess 4a at central portion.The main part 3a of upper portion insulating sheet 3 is entrenched in this first recess 4a, and the central authorities of main part have the hole portion for inserting rivet 2, and the neighboring 3b of main part extends to the surface of cover plate 4 vertically upward.As shown in Figures 2 and 3, in the present embodiment, upper portion insulating sheet 3 is characterised in that, reach out to be formed with flange 3c from the neighboring 3b of main part 3a along the upper surface of cover plate 4, and this flange 3c covers on the upper surface of cover plate 4 closely.
As shown in Figure 4, the width of the upper portion insulating sheet that possesses flange 3c in cell thickness direction is D
1, the width of cover plate 4 on directions X is D
0.The D here
0the distance of cover plate between the both sides of the edge of directions X, D
1it is the flange 3c of the upper portion insulating sheet distance between the both sides of the edge of directions X.When the width D of upper portion insulating sheet
1be greater than the width D of cover plate
0time, the edge of flange 3c can expose outside battery side, causes assembling and appearance variation, therefore will be by the width D of upper portion insulating sheet
1be set as being less than or equal to the width D of cover plate
0.
And then, flange 3c sets according to the size of cell thickness aptly in the upper scope from the outward extending width of neighboring 3b (being sometimes referred to as below " width of flange ") of thickness direction (directions X in Fig. 4) of battery, but the scope that is generally 1mm～1cm, is preferably 2mm～8mm.If the width of flange is too small, can not in charge and discharge process, play and guarantee to discharge and recharge the effect that terminal does not contact with cover plate with rivet simultaneously, therefore its lower limit is set as to 1mm, if the width of flange is excessive, sometimes in the laser beam welding of hush panel assembly and battery case, is easily subject to the hot impact of laser and generation thereof and deforms.Therefore, consider from this point, also the width of flange will be set as not exceeding the edge of cover plate in cell thickness direction, i.e. D
1≤ D
0.
In addition, in the time adopting laser side welding manner to connect battery case and hush panel assembly, can be by the width D of upper portion insulating sheet
1suitably be set as larger value, for example, equal the width D that its higher limit is cover plate
0but in the time adopting the mode of laser welded top, in laser beam welding, be subject to the hot impact of laser and generation thereof and deform for fear of upper portion insulating sheet, preferably between flange and the edge of cover plate, retain certain space, for example 1～3mm, with the impact of guaranteeing not to be subject to the irradiation of laser or being subject to its sweating heat.
In the upper portion insulating sheet of the present embodiment shown in Fig. 3, the shape of the neighboring of flange is illustrated as round rectangle, but is not limited to this, can be also any shape in rectangle, circle, ellipse.In the time that the neighboring of flange is shaped as circle or ellipse, above-mentioned width D
1the ultimate range of the both sides circular arc of Width that refers to flange in cell thickness direction.
According to the hush panel assembly of present embodiment, because the neighboring of the main part at upper portion insulating sheet is provided with flange 3c, can effectively guarantee that in charge and discharge process, discharge and recharge terminal does not contact with cover plate with rivet simultaneously, thereby avoid the external short circuit of battery, greatly improved the fail safe in battery production process.
(execution mode 2)
Secondly, the structure of the hush panel assembly 1 with reference to Fig. 5 to embodiments of the present invention 2 describes.For giving identical indicia with the battery of execution mode 1 with the identical parts of hush panel assembly, and the description thereof will be omitted.
For the hush panel assembly 1 of execution mode 2, be with the difference of execution mode 1, cover plate 4 is formed with the shape second recess 4b corresponding with flange 3c around the first recess 4a, flange 3c can be embedded in this second recess 4b, and the upper surface of flange 3c is roughly concordant with the upper surface of cover plate 4.
According to the hush panel assembly of present embodiment, by the second recess 4b corresponding with the shape of flange is on the cover board further set, and the flange 3c that makes upper portion insulating sheet is embedded in this second recess, thereby make in the time that hush panel assembly is carried out to laser welding, laser can not shine directly on flange, avoid the distortion of the upper portion insulating sheet being caused by laser welding, thereby can further guarantee the fail safe in charge and discharge process.
(execution mode 3)
In addition, with reference to Fig. 6, the structure of the hush panel assembly 1 to embodiments of the present invention 3 describes.For giving identical indicia with the battery of execution mode 1 with the identical parts of hush panel assembly, and the description thereof will be omitted.
For the hush panel assembly 1 of execution mode 3, be with the difference of execution mode 2, on the neighboring of flange 3c, be further formed with the flange 3d to upper process perpendicular to the surface of flange, its height is a little more than flange surface.Flange 3d can arrange continuously in the neighboring of flange 3c, also can arrange discontinuously.
According to the hush panel assembly of present embodiment, by the neighboring of the flange at upper portion insulating sheet, flange 3d is set, limit the mensuration terminal of charging/discharging apparatus in slip or the displacement on flange surface, can prevent from measuring time, discharge and recharge terminal and contact with cover plate with rivet simultaneously, thereby can further guarantee the fail safe in charge and discharge process.
(execution mode 4)
In addition, with reference to Fig. 7, the structure of the hush panel assembly 1 to embodiments of the present invention 4 describes.For giving identical indicia with the battery of execution mode 1 with the identical parts of hush panel assembly, and the description thereof will be omitted.
For the hush panel assembly 1 of execution mode 4, be with the difference of execution mode 1, the bottom of the side, edge of the surrounding of cover plate 4 is provided with the step 4c caving inward, this step 4c can engage with the peristome 9a that is positioned at battery case 9 upper ends, hush panel assembly 1 can be partly built on battery case 9, be conducive to improve operability when hush panel assembly and battery case are carried out to side welding.
According to the hush panel assembly of present embodiment, by the setting table rank, side, edge at cover plate, be more conducive to adopt the mode of laser side welding to connect battery case and hush panel assembly.Because the heat of laser and generation thereof in this welding manner is less on the impact of upper portion insulating sheet, therefore can prevent the distortion of upper portion insulating sheet.And then, for example, owing to can the width of upper portion insulating sheet being set widelyr (equaling its higher limit is cover plate width), contact with cover plate time with rivet thereby can further prevent from discharging and recharging terminal, guarantee the fail safe in charge and discharge process.
Above, carried out exemplary explanation by the structure of 1～4 pair of hush panel assembly 1 of the present invention of execution mode.But hush panel assembly of the present invention is not limited to above-mentioned concrete form, also the key element in above-mentioned execution mode can be carried out to independent assortment.For example, the ledge structure that the neighboring of the structure of the second recess of cover plate central authorities, flange has the structure of flange or a side, edge of cover plate all can be applicable to above-mentioned any execution mode alone or in combination.
For the material that forms the upper portion insulating sheet in above-mentioned hush panel assembly, as long as not yielding and to have the macromolecular material of insulating properties just passable, have no particular limits, but preferably formed by polytetrafluoroethylene (PFA).In addition, in hush panel assembly of the present invention, upper portion insulating sheet and bottom insulating trip can be shaped separately by mould, also can directly be injected on cover plate.In order to reduce process number, preferably upper portion insulating sheet and bottom insulating trip are passed through to injection moulding integrated molding.
< possesses the battery > of hush panel assembly
Below, with reference to Fig. 8, the square battery 10 that possesses hush panel assembly 1 of the present invention is described.Battery 10 of the present invention possesses: have in upper end peristome battery case 9, the hush panel assembly 1 that peristome is sealed, be contained in electrode group and electrolyte (not shown) in battery case 9.Wherein, electrode group is the flat electrode group that positive pole, barrier film and negative pole are reeled or be laminated.By this electrode group insert battery case 9 interior after, by laser welding by 1 seam of hush panel assembly on the peristome 9a of battery case 9, and seal after injecting electrolyte by the liquid injection port 8 on cover plate 4, thereby be assembled into square lithium rechargeable battery 10.In the time of the abnormal conditions such as battery is short-circuited, its inner gas producing can be discharged into from steam vent (safety valve) 7 outside of battery.
In addition, more preferably, in the time that the bottom of the side, edge of cover plate is provided with the step caving inward, together with the mode laser welding that described hush panel assembly is taked side welding with the peristome of described battery case, now, described step engages with the peristome of described battery case, and weld seam is formed at the side of battery, is positioned at the position that step 4c engages with the peristome 9a of battery case.
In above each execution mode, although introduced hush panel assembly of the present invention and possessed the secondary cell of this hush panel assembly as example take the lithium rechargeable battery of square, the present invention is not limited to this.Above-mentioned hush panel assembly also goes for the battery of other profiles or other kinds, such as cylinder-type nickel-metal hydride battery, platypelloid type lithium ion battery etc. after suitable distortion.
In addition, although in the present invention as an example of laser welding example for the method for hush panel assembly and battery case welding is illustrated, be also not limited to this, also can adopt solder technology well known in the art, such as arc welding etc.
Above, by specific embodiment the present invention is had been described in detail, the present invention is not limited to above-mentioned concrete example certainly.Those skilled in the art can expect various distortion or modification in the record category of accompanying claims, and these variation and modification also belong to protection scope of the present invention certainly.
Claims (7)
1. a battery hush panel assembly, it is that rivet by doubling as electrode terminal runs through successively upper portion insulating sheet, cover plate, bottom insulating trip and pad and they are riveted together and are formed, described cover plate (4) is formed with the first recess (4a) at central portion, the main part (3a) of described upper portion insulating sheet (3) is entrenched in this first recess (4a), it is characterized in that
Reach out to be formed with flange (3c) from the neighboring (3b) of described main part (3a) along the upper surface of described cover plate (4)
Described flange is more than 1mm from the outward extending width in described neighboring on the thickness direction of battery, but does not exceed the edge of described cover plate in cell thickness direction,
On the neighboring of described flange, be formed with the flange to upper process (3d) perpendicular to the surface of flange.
2. battery according to claim 1 hush panel assembly, is characterized in that, the neighboring shape of described flange is any shape in rectangle, round rectangle, circle, ellipse.
3. battery according to claim 1 hush panel assembly, it is characterized in that, described cover plate is formed with shape second recess (4b) corresponding with described flange (3c) around described the first recess (4a), and described flange (3c) is embedded in described the second recess (4b).
4. according to the hush panel assembly of the battery described in any one in claim 1～3, it is characterized in that, the bottom of the side, edge of described cover plate is provided with the step (4c) caving inward.
5. according to the hush panel assembly of the battery described in any one in claim 1～3, it is characterized in that, described upper portion insulating sheet and described bottom insulating trip are by injection moulding integrated molding.
6. a secondary cell, it possesses: the hush panel assembly that have the battery case of peristome in upper end, described peristome is sealed and be contained in electrode group and the electrolyte in described battery case, it is characterized in that, described hush panel assembly is the hush panel assembly of the battery described in any one in claim 1～5.
7. battery according to claim 6, it is characterized in that, in the time that the bottom of the side, edge of described cover plate is provided with the step (4c) caving inward, described step (4c) engages with the peristome (9a) of described battery case, together with the mode laser welding that described hush panel assembly is taked side welding with described battery case, weld seam is positioned at the position that described step (4c) engages with the peristome (9a) of described battery case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237332.3A CN102339958B (en) | 2010-07-23 | 2010-07-23 | Seal plate assembly for battery and battery having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010237332.3A CN102339958B (en) | 2010-07-23 | 2010-07-23 | Seal plate assembly for battery and battery having the same |
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| Publication Number | Publication Date |
|---|---|
| CN102339958A CN102339958A (en) | 2012-02-01 |
| CN102339958B true CN102339958B (en) | 2014-05-28 |
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|---|---|---|---|
| CN201010237332.3A Active CN102339958B (en) | 2010-07-23 | 2010-07-23 | Seal plate assembly for battery and battery having the same |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637835A (en) * | 2012-02-28 | 2012-08-15 | 天津市捷威动力工业有限公司 | Cover plate structure and battery case for lithium ion battery and lithium ion battery |
| CN110649206A (en) * | 2019-09-29 | 2020-01-03 | 惠州亿纬锂能股份有限公司 | Explosion-proof valve component, top cover and battery |
| CN110729421B (en) * | 2019-11-19 | 2024-06-18 | 湖南领湃达志科技股份有限公司 | Battery cover plate assembly, battery cell, assembly method of battery cell and connecting sheet |
| CN113764790A (en) * | 2021-10-08 | 2021-12-07 | 深圳市聚和源科技有限公司 | Covering assembly and battery |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201789005U (en) * | 2010-07-23 | 2011-04-06 | 松下能源(无锡)有限公司 | Battery sealing plate component and battery with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100405873B1 (en) * | 1995-07-28 | 2004-03-30 | 산요덴키가부시키가이샤 | Laser Sealed Battery |
| US6132900A (en) * | 1996-12-25 | 2000-10-17 | Matsushita Electric Industrial Co., Ltd. | Method of production of non-aqueous electrolyte battery and seal plate thereof |
| JP3756096B2 (en) * | 2001-10-02 | 2006-03-15 | Ｎｅｃトーキン栃木株式会社 | Sealed battery |
| CN2859815Y (en) * | 2005-12-29 | 2007-01-17 | 比亚迪股份有限公司 | Battery cover sheet and electric battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201789005U (en) * | 2010-07-23 | 2011-04-06 | 松下能源(无锡)有限公司 | Battery sealing plate component and battery with same |
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