CN1787260A - Battery grid and casting method thereof - Google Patents
Battery grid and casting method thereof Download PDFInfo
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- CN1787260A CN1787260A CNA2005100216276A CN200510021627A CN1787260A CN 1787260 A CN1787260 A CN 1787260A CN A2005100216276 A CNA2005100216276 A CN A2005100216276A CN 200510021627 A CN200510021627 A CN 200510021627A CN 1787260 A CN1787260 A CN 1787260A
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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 discloses a secondary cell bar, comprising bar frame as well as transverse ribs and vertical ribs fixed in the bar frame, where the total sectional area ratio of the transverse ribs to the vertical ones is k, and the value of k is between 1.2 and 1.8. The invention also discloses a method for casting the secondary cell bar, comprising the steps of: in the bar caster, keeping the lead boiler temperature at 480 deg.C - 500 deg.C, the lead scoop temperature at 500 deg.C -530 deg.C, the lower part temperature of the moving die at 190 deg.C-230 deg.C, the upper part temperature of the moving die at 175 deg.C-240 deg.C, and the injection mold temperate at 165 deg.C-175 deg.C, and casting in the direction of the vertical bars in the bar mold. The bar is well-molded and unbroken, thus able to reduce the alloy content and save the production cost and simultaneously add the adhesive weight of the active matters and increase the secondary cell capacity; and the secondary cell made of the bar of the invention has more excellent properties.
Description
Technical field
The present invention relates to building block of a kind of storage battery and preparation method thereof, particularly relate to a kind of grid and casting method thereof of valve-regulated lead-acid battery.
Background technology
(market prospects of VRLA battery present very good situation for Valve Regulated Lead Acid Battery, the VRLA) extensive use of battery in every field along with VRLA in recent years.But at the same time, the client also has higher requirement in the process of using battery.The particularly application of valve control battery in ups power, the user has higher requirement to heavy-current discharge performance, the specific energy aspect of battery.This also just impels need set about improving the battery product structure, and the structural design of grid is particularly important.
Grid is the important component part of storage battery, and its effect in storage battery mainly is to support active material, and electric current is evenly distributed on the active material, to improve the utilance of active material.Traditional grid mainly is made of the grid frame of band lug and perpendicular muscle, the horizontal bar that is fixed in the grid frame.Wherein, perpendicular muscle is arranged between the upper and lower frame of grid frame, and horizontal bar is arranged between two vertical edge frames.
Though grid is participated in into stream reaction in battery, the main performance of battery such as capacity, life-span, macrocell are banished electricity and charging accept etc. all to have a significant impact.The main effect of grid frame is to prevent that grid is out of shape in the coated plate process, tears.The horizontal bar major function is and erects muscle and be connected to support active material; Perpendicular muscle mainly is in order to delivered current.An important channel of specific energy of therefore improving VRLA battery is an appropriate design grid structure, makes the electromotive force of grid, and CURRENT DISTRIBUTION is more reasonable, the more important thing is that this structure must be accomplished in industrial production.
Some early stage scholars distribute to the lead-acid battery electrode surface potential and study, and they have measured the electrical potential difference between the polar board surface different parts, find that pole plate bottom active material utilization is lower than top.When the voltage loss of research start type lead-acid battery, measured the electrical potential difference at each position on the grid of lug, find that the voltage loss on binding post, joint and the grid accounts for 16% of total voltage loss.The calculating principle of Potential Distributing is to be the grid equivalence resistor network, and the rib junction is as the node of this network anyhow, the electric current of going up on each node all meets the node current law, promptly enters and the electric current sum that flows out each node equals zero.Calculated example is as follows under the situation that the electricity of not considering active material is led, and computing unit is as shown below:
" 0 " point among the figure
In the formula: i----crosses over the current density (A/cm2) of grid
The size (cm) of a, b----rectangle computing unit
Hi----horizontal direction gate rib cross-sectional area (at 1,2,3,4 each points) (cm2)
Vi----vertical direction gate rib cross-sectional area (at 1,2,3,4 each points) (cm2)
The conductivity (S/m) of κ----grid material
φ i---is at the electromotive force (V) of 1,2,3,4 each points
φ 0 is the function of each point electricity on every side, and the electromotive force of any is as follows arbitrarily in the grid:
Grid with M root transverse rod strip, the perpendicular rib of N root has M*N equation.
Show that by calculating when the area that keeps electrode is constant, for the muscle sectional area is constant anyhow, when the ratio of muscle was big more anyhow, voltage drop was just big more, it is inhomogeneous that CURRENT DISTRIBUTION is tending towards more.By this theory analysis, the Rational structure of grid should be that the muscle ratio further reduces anyhow.
But traditional grid structure generally all is to adopt horizontal bar many, the perpendicular few structure of muscle.By the casting mode of traditional grid mould, be horizontal during the grid moulding, promptly horizontal bar is in vertical direction.
The casting battery grid generally adopts casting plate machine at present, mainly comprises lead pan, plumbous spoon, mould etc., and its operation principle is: liquid alloy lead rises to plumbous spoon by pump along utilidor, and plumbous spoon pours into mould to plumbous liquid.Plumbous liquid is cooled to the grid blank in mould.Conveyer belt is sent the grid blank to the apparatus for leveling leveling, sends into Qie Moqie by transfer roller again and removes surplus limit, by panel turnover mechanism grid is delivered on the storage rack at last, finishes one by the plumbous technical process to solid alloy stereotype grid of liquid alloy.In the traditional operation of casting grid, generally the lead pan temperature is made as 460-480 ℃, a plumbous spoon temperature and is 480-510 ℃, 170-210 ℃ of dynamic model temperature of lower, 155-220 ℃ of dynamic model upper temp, 150 ℃ of jet mould temperature, the jet mould number of times is 2～3 times, casting rate is a per minute 6-7 sheet, laterally casts along the horizontal bar direction in the grid mould.
Do not adopt the reason of vertical casting to be, by traditional casting process, the grid that vertical casting obtains is easy-formation not, easily broken muscle.And when horizontal casting, many, the perpendicular few mode of muscle of horizontal bar is beneficial to the casting of grid, horizontal bar for a long time, the dirty passage of plumbous relatively liquid is just many, be beneficial to around shunting and casting well.The suitable property that this horizontal bar is many, the perpendicular few structure of muscle is based on the grid casting technique designs, and the battery performance that produces with the grid of this structure is good inadequately, and voltage drop is big, and it is inhomogeneous that CURRENT DISTRIBUTION is tending towards.If represent horizontal bar total sectional area/perpendicular muscle total sectional area with the k value, the k value of so present grid molding mode causes the increase of lead loss amount (kg/kVAH) again so simultaneously all greater than 1.8, causes the waste of resource.
Summary of the invention
To the objective of the invention is in order overcoming the above problems, a kind of casting method that can make the voltage drop minimizing, the CURRENT DISTRIBUTION that are caused by grid be tending towards rationally and make the improved battery grid of battery performance and this battery grid to be provided.
For achieving the above object, the present invention has adopted following technical scheme:
The invention discloses a kind of battery grid, comprise grid frame, and be fixed on horizontal bar and perpendicular muscle in the grid frame, described horizontal bar is the k value with the ratio of the total sectional area of perpendicular muscle, and the k value is between 1.2 to 1.8.
In the preferred embodiments of the disclosure, described k value is 1.37.
Described storage battery is a valve-regulated lead-acid battery.
The invention also discloses the casting method of above-mentioned battery grid, described method comprises step: keeping the lead pan temperature in making the casting plate machine of grid is that 480-500 ℃, plumbous spoon temperature are under 500-530 ℃, the situation of 190-230 ℃ of dynamic model temperature of lower, 175-240 ℃ of dynamic model upper temp, 165-175 ℃ of jet mould temperature, vertically to cast along perpendicular muscle direction in the grid mould.
In preferred version of the present invention, described method further comprises step, before the vertical casting under 165-175 ℃ jet mould temperature jet mould 4-5 time.
Casting rate is a per minute casting 4-5 sheet grid.
Because adopted above scheme, the beneficial effect that the present invention is had is:
Utilize casting method of the present invention under given conditions along the perpendicular muscle direction grid of vertically casting, solved the technical problem of " when vertically the casting grid not easy-formation, easily broken muscle " of thirsting in this area solving always but failing all the time, the grid moulding of preparing is good, there is not disconnected muscle phenomenon, and can reduce needed alloy amount, save production cost, but can increase the active material weight that to adhere on the grid simultaneously, thereby improve battery capacity; And the battery that adopts grid of the present invention to make can improve the ability to accept that discharges and recharges, the cycle life that reduces the internal resistance of cell, reduction grid corrosion rate, raising battery, and helps to overcome premature capacity loss (PCL) phenomenon of valve-regulated lead-acid battery.
Embodiment
The present invention is described in further detail below by concrete execution mode.
The grid that a kind of valve-regulated lead-acid battery is used, this grid comprises grid frame, and is fixed on horizontal bar and perpendicular muscle in the grid frame, and horizontal bar has 5, perpendicular muscle to have 3, and every horizontal bar sectional area is 1.5mm
2, perpendicular muscle sectional area is 1.83mm
2, horizontal bar total sectional area/perpendicular muscle total sectional area (k value) is 1.37.
The manufacturing process of this grid is: the lead pan temperature in the casting plate machine is made as 490 ℃, a plumbous spoon temperature is made as 520 ℃, dynamic model temperature of lower and is made as 220 ℃, dynamic model upper temp and is made as 230 ℃, jet mould temperature and is made as 170 ℃, jet mould 4-5 time, casting rate remains on per minute casting 4-5 sheet grid, vertically casts along perpendicular muscle direction in the grid mould.
The grid moulding of preparing is good, does not have disconnected muscle phenomenon.
Above-mentioned grid is carried out following analysis:
1. the grid relevant parameter relatively
New and old grid relevant design data contrast sees Table one, and new grid is above-mentioned grid of the present invention, and the k value is 1.37, and old grid is that every horizontal bar sectional area is 1.0mm according to the grid of conventional method (along the horizontal casting of horizontal bar direction) preparation
2, perpendicular muscle sectional area is 2.5mm
2, the k value is 2.0.
Table one: new and old grid relevance parameter
| Project | Old 2.0Ah grid | New 2.0Ah grid | ||
| 1# | 2# | 1# | 2# | |
| Polarity | + | - | + | - |
| Horizontal bar quantity | 10 | 10 | 5 | 5 |
| Perpendicular muscle quantity | 2 | 2 | 3 | 3 |
| Horizontal bar centre-to-centre spacing (mm) | 5.233 | 5.325 | 8.971 | 5.325 |
| Perpendicular muscle centre-to-centre spacing (mm) | 8.15 | 8.7 | 6.52 | 6.96 |
| Grid weight (g) | 23.47 | 13.7 | 21.4 | 12.2 |
| Active material weight (g) | 25.1 | 18.5 | 25.8 | 19.1 |
As can be seen, the used alloy amount of new grid decreases, and active material weight increases, thereby has improved the capacity of battery.
2. grid corrosion resistance test
Above-mentioned new and old two kinds of grids are carried out corrosion resistance test, and experimental condition is as follows:
The grid sample is placed the sulfuric acid solution of d=1.290g/cm3, with 1.0A constant current anode polarization 480h, about 25 ℃ of ambient temperatures.Remove surface oxides then in the sugared aqueous slkali of heat, calculate corrosion rate according to corrosion weight loss and surface area of sample, twice result of the test of two kinds of grids sees Table two;
The corrosion rate of two kinds of designs of table two grid
| Corrosion rate | Old grid | New grid | ||
| 1# | 2# | 1# | 2# | |
| mg/cm 2/h mg/cm 2/d | 0.120 2.88 | 0.116 2.78 | 0.0879 2.10 | 0.0841 2.01 |
By data in the table two as can be seen, new grid corrosion rate is more much lower than old design, descends about 25% approximately, and She Ji its life-span of positive grid will be greatly improved like this.
3. voltage drop is relatively:
New grid voltage drop sees Table three with the amount that decline is compared in old design.
Computing formula as shown in Table, the length that sectional area of flowing through according to electric current on the grid and electric current are flowed through can calculate the voltage drop on the grid rib, thereby estimates its influence to the internal resistance of cell.
Contrast falls in the new and old layout board gate voltage of table three
| Project | Polarity | Voltage drop | Computing formula: the sectional area that the length S=electric current that Δ U=IR R=ρ l/S ρ=0.0000003 Ω m l=electric current is flowed through is flowed through |
| Voltage drop (mv) | + | -0.00000533 | |
| - | -0.00000873 | ||
| (mv) falls in total voltage | -0.00001406 |
As can be seen, because perpendicular muscle has increased by 1/3, new grid has descended about 33.3% than the voltage drop of old grid.This has good effect for the heavy-current discharge performance that improves battery.
Grid of the present invention also can have influence on the CURRENT DISTRIBUTION in the battery charge and discharge process except that influential to the grid voltage drop, thereby can significantly improve the discharge performance of battery, charge acceptance and cycle life etc.Below the dependence test result for the assembled battery of the new and old grid of employing institute compares.
4. battery capacity test
Test correlated results such as table four with the pole plate assembled battery that new and old grid is made:
Table four: three kinds of discharging condition volume tests of battery of two kinds of grid designs
| Project | Old grid | New grid | ||
| 1# | 2# | 1# | 2# | |
| Open circuit voltage (V) | 6.50 | 6.51 | 6.53 | 6.53 |
| Internal resistance (m Ω) | 16 | 17 | 12 | 13 |
| 5 hour rates discharge time (hr) | 5.1 | 5.15 | 5.32 | 5.4 |
| 1C discharge time (min) | 35 | 35.5 | 41 | 42 |
| 3C discharge time (min) | 7.2 | 7.6 | 9.5 | 9.8 |
As can be seen from Table IV, no matter adopt the battery of new grid still is that the heavy-current discharge performance aspect all improves significantly from internal resistance.
5. battery charge is by being subjected to ability relatively to see Table five
The table charge acceptance of the different plate Gate of table five assembled battery relatively
| Old grid | New grid | Old grid | New grid | Old grid | New grid | |
| Cycle-index | 1 | 1 | 2 | 2 | 3 | 3 |
| Discharge system | 0.2C10A be discharged to final voltage 10.2V | 0.2C10A discharge 3h | ||||
| Charging system | 0.1C10A constant current pressure limiting 14.80 chargings, 3h is constant up to electric current | |||||
| Discharge electricity amount/Ah | 13.5 | 13 | 14.4 | 13.4 | 8.7 | 8 |
| Charge capacity/Ah | 15.8 | 15.6 | 16.72 | 16.24 | 9.92 | 9.71 |
| Constant current time/h | 10 | 11.5 | 9.87 | 11.7 | 5.4 | 6.3 |
| Discharge and recharge coefficient | 117 | 120 | 116.1 | 121.2 | 114.1 | 121.4 |
Annotate: discharge and recharge i.e. this time of coefficient and charge and discharge the electric weight and the ratio of charge/discharge electricity amount last time, can be used as the sign of battery charge ability to accept
Found out by table five data: with the VRLA battery that new grid pole plate is made, with old comparing, no matter at deep discharge or under the shallow discharge system, its charge acceptance is all better.This is because the new construction grid has reduced the pole plate internal resistance, make that electric current is evenly distributed when discharging and recharging on active material, current density is less, reduce middle active material current conduction path, polarization speed is slowed down, improved the battery charge ability to accept, make it help forming active material rational in infrastructure, favorable conductive network and sufficient electro-chemical activity brown lead oxide are arranged, so charge-discharge performance is good, the battery charge ability to accept is good.
6. battery cycle life
The cycle life of the battery of two kinds of structure grids manufacturing sees Table six
The contrast of table six cycle life
| Project | Old grid | New grid | ||
| 1# | 2# | 1# | 2# | |
| 1C cycle life (cycles) | 300 | 301 | 356 | 346 |
| 3C cycle life (cycles) | 201 | 200 | 251 | 253 |
As can be seen, on the basis of adopting the new construction grid, the cycle life of storage battery to a great extent be improved significantly.
Claims (6)
1, a kind of battery grid comprises grid frame, and is fixed on horizontal bar and perpendicular muscle in the grid frame, and it is characterized in that: described horizontal bar is the k value with the ratio of the total sectional area of perpendicular muscle, and the k value is between 1.2 to 1.8.
2, a kind of battery grid according to claim 1 is characterized in that: described k value is 1.37.
3, a kind of battery grid according to claim 1 and 2 is characterized in that: described storage battery is a valve-regulated lead-acid battery.
4, the casting method of the described battery grid of claim 1, described method comprises step: keeping the lead pan temperature in making the casting plate machine of grid is that 480-500 ℃, plumbous spoon temperature are under 500-530 ℃, the situation of 190-230 ℃ of dynamic model temperature of lower, 175-240 ℃ of dynamic model upper temp, 165-175 ℃ of jet mould temperature, vertically to cast along perpendicular muscle direction in the grid mould.
5, the casting method of battery grid according to claim 4 is characterized in that: described method further comprises step, before the vertical casting under 165-175 ℃ jet mould temperature jet mould 4-5 time.
6, the casting method of battery grid according to claim 5 is characterized in that: casting rate is a per minute casting 4-5 sheet grid.
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| CNB2005100216276A CN100347888C (en) | 2005-09-01 | 2005-09-01 | Battery grid and casting method thereof |
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| CNB2005100216276A CN100347888C (en) | 2005-09-01 | 2005-09-01 | Battery grid and casting method thereof |
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| CN100347888C CN100347888C (en) | 2007-11-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332503B (en) * | 2007-06-28 | 2010-05-26 | 肇庆理士电源技术有限公司 | Air sucking and blowing device for casting plate machine and implementation method thereof |
| CN101847723A (en) * | 2010-05-31 | 2010-09-29 | 张天任 | Alternate lead-acid storage battery grid |
| CN103399220A (en) * | 2013-07-09 | 2013-11-20 | 超威电源有限公司 | Method for testing equi-voltage curve of plate grid of storage battery |
| CN109465427A (en) * | 2018-12-27 | 2019-03-15 | 天能电池(芜湖)有限公司 | A kind of control method promoting casting rate |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2155076Y (en) * | 1993-08-20 | 1994-02-02 | 北京康阳电子生物科技有限公司 | Emittance ribbed slab lattice for colloid accumulator |
| JP3344206B2 (en) * | 1996-04-24 | 2002-11-11 | 新神戸電機株式会社 | Lead storage battery grid and method of manufacturing the same |
| CN2578993Y (en) * | 2002-09-28 | 2003-10-08 | 湖北骆驼蓄电池股份有限公司 | Grid for valve-control accumulator |
| CN2648611Y (en) * | 2003-02-21 | 2004-10-13 | 曲阜圣阳电源实业有限公司 | Lead-acid battery grid |
-
2005
- 2005-09-01 CN CNB2005100216276A patent/CN100347888C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101332503B (en) * | 2007-06-28 | 2010-05-26 | 肇庆理士电源技术有限公司 | Air sucking and blowing device for casting plate machine and implementation method thereof |
| CN101847723A (en) * | 2010-05-31 | 2010-09-29 | 张天任 | Alternate lead-acid storage battery grid |
| CN101847723B (en) * | 2010-05-31 | 2012-12-12 | 张天任 | Alternate lead-acid storage battery grid |
| CN103399220A (en) * | 2013-07-09 | 2013-11-20 | 超威电源有限公司 | Method for testing equi-voltage curve of plate grid of storage battery |
| CN109465427A (en) * | 2018-12-27 | 2019-03-15 | 天能电池(芜湖)有限公司 | A kind of control method promoting casting rate |
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| CN100347888C (en) | 2007-11-07 |
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Assignee: Dongguan Leoch Battery Technology Co., Ltd. Assignor: Lishiao Electric Power Tech. Co., Ltd., Shenzhen Contract fulfillment period: 2007.11.25 to 2017.11.24 contract change Contract record no.: 2009440000263 Denomination of invention: Battery grid and casting method thereof Granted publication date: 20071107 License type: Exclusive license Record date: 2009.4.10 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.11.25 TO 2017.11.24; CHANGE OF CONTRACT Name of requester: DONGGUAN CITY LISHIAO POWER SUPPLY TECHNOLOGY CO., Effective date: 20090410 |
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