CN110165135B - Storage battery and negative plate tab pinching method thereof - Google Patents
Storage battery and negative plate tab pinching method thereof Download PDFInfo
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- CN110165135B CN110165135B CN201910465123.5A CN201910465123A CN110165135B CN 110165135 B CN110165135 B CN 110165135B CN 201910465123 A CN201910465123 A CN 201910465123A CN 110165135 B CN110165135 B CN 110165135B
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- tab
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D21/00—Combined processes according to methods covered by groups B21D1/00 - B21D19/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
- H01M50/541—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges for lead-acid accumulators
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a storage battery and a negative plate electrode lug pinching method of the storage battery, belongs to the technical field of storage battery manufacturing, and solves the problems that the negative plate electrode lug pinching effect is unstable and the service life of the storage battery is influenced in the prior art. The method for pinching the tabs by the edge negative plate comprises the following steps: step 1: selecting a bending point at the upper part of the upper frame of the edge negative plate, wherein the bending point is away from the upper frame of the edge negative plate by a certain distance, and the tab of the distance section has no horizontal deviation; step 2: bending the tab at the bending point in the step 1, and controlling the bending angle and the length of the bent tab in the vertical direction; and step 3: and (3) bending the upper part of the negative plate tab on the basis of the step (2), controlling the horizontal offset distance of the tab of the section, and pinching the tab. The storage battery comprises a shell and a battery pole group arranged in the shell, and the tabs of the negative plate on the side of the battery pole group are kneaded by adopting the method. The invention improves the effect of holding the pole ear by the edge negative plate and prolongs the service life of the battery.
Description
Technical Field
The invention relates to the field of storage battery manufacturing, in particular to a storage battery and a method for pinching tabs of a side negative plate of the storage battery.
Background
With the implementation of the new national standard of the lead-acid storage battery, the improvement of the specific energy of the battery becomes an urgent task in the lead-acid storage battery industry.
The battery is changed from gap bridge welding to direct connection welding, which is a feasible scheme for improving the specific energy of the battery, thereby reducing the lead consumption of the bus bar, reducing the length of the bus bar and reducing the internal resistance of the battery. In the actual production process, however, the problem of negative plate adhesive-climbing is easily caused in the process of gluing and sealing the battery semi-finished product after straight continuous casting welding, the utilization rate of the negative plate active substance is greatly reduced, and even the separator is seriously glued; the components of the sealant are easy to form a complex with lead ions, so that dendrite of the separator is short-circuited, and the service life of the battery is influenced.
The manual tab pinching or punching is generally adopted in actual production to pinch the tab, and the manual tab pinching can lead to different influences due to the difference of tab pinching strength of staff. When the force for pinching the tabs is too high, on one hand, the separator is easily crushed to cause the short circuit of dendrites of the separator, and on the other hand, the edge negative plate and the adjacent negative plate are close to each other to easily cause cast welding stripping or false welding; when the force is too small, the ear pinching effect cannot be achieved, and the glue is easy to climb; the existing tab pinching device can only simply bend the negative plate tab due to structural design defects of a tab pinching die and air pressure limitation of an air cylinder, and the tab pinching effect is similar to that of manual tab pinching; meanwhile, due to the fluctuation of the distance between the pole group and the pole lug pinching mold, the pole lug pinching effect of the edge negative plate is large in fluctuation, and the problem of glue climbing of the edge negative plate still exists.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a battery and a method for pinching tabs by a negative plate of the battery, which solve the problems of unstable tab pinching effect of the negative plate and influence on the battery life in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides a method for pinching a tab by a negative plate, which comprises the following steps:
step 1: selecting a bending point at the upper part of the upper frame of the edge negative plate, wherein the bending point is away from the upper frame of the edge negative plate by a certain distance, and the tab of the distance section has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, and controlling the bending angle and the length of the bent tab in the vertical direction;
and step 3: and (3) bending the upper part of the negative plate tab on the basis of the step (2), controlling the horizontal offset distance of the tab of the section, and pinching the tab.
On the basis of the scheme, the invention is further improved as follows:
further, in the step 1, the bending point is 1-3mm away from the upper frame of the negative plate.
Further, in the step 2, the bending angle is 120-140 degrees.
Further, in step 2, the bending angle is 135 °.
Further, in the step 2, the length of the bent tab in the vertical direction is 4-4.5 mm.
Further, in step 3, the horizontal offset distance is 0.5-1 mm.
Further, in the step 2, the length of the bent tab in the vertical direction is 4.5 mm.
On the other hand, the invention also provides a storage battery, which comprises a shell and a battery pole group arranged in the shell, wherein the tabs of the negative plate on the side of the battery pole group are kneaded by adopting the method.
Further, the battery pole group comprises a positive plate, a negative plate, a positive lug, a negative lug and a separator;
the quantity of the positive plates and the negative plates is multiple, the positive plates and the negative plates are arranged alternately, the partition plates are arranged between the positive plates and the negative plates, the bottoms of every two adjacent partition plates are connected to form a U-shaped structure, and the positive plates are wrapped in the U-shaped structure;
the upper edge of the positive plate is provided with positive lugs, the upper edge of the negative plate is provided with negative lugs, and the positive lugs and the negative lugs are arranged in multiple rows;
the quantity of battery utmost point crowd is a plurality of, and the utmost point ear between a plurality of battery utmost point crowd adopts directly connecting cast joint structure.
Furthermore, the separator is a superfine glass fiber board.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) the length of the upper bending point of the upper frame of the side negative plate away from the upper frame of the side negative plate is controlled, so that the pole lug can not crush the partition plate after the pole group is cast and welded, and the phenomenon of glue climbing of the side negative plate can be avoided.
b) By controlling the bending angle, the tab is not easy to cast weld and fall or false weld after pinching the tab, and the negative plate adhesive climbing after the battery is sealed by the adhesive can be avoided.
c) Through controlling the length of the bent tab in the vertical direction, the tab pinching effect can be achieved, and the cast welding or false welding is not easy to occur.
d) By controlling the horizontal offset distance and the length, the distance between the negative plate lug and the plastic shell is ensured to be the largest, and the top of the lug is unlikely to lean against the adjacent lug, so that the negative plate can be prevented from being glued and cast-welded to fall off.
e) After the electrode lugs are treated by the method, the length of the negative bus bar can be properly shortened, and the lead consumption and the internal resistance of the bus bar are reduced.
f) The negative plate electrode lug processed by the method can not crush the separator, and is beneficial to prolonging the service life of the battery.
g) Compared with the existing gap bridge welding, the storage battery has the advantages that the tabs among the battery pole groups are in the direct-connection cast-weld structure, and the length of the bus bar is shorter, so that the input and output effects of current are good, the current derivation resistance is lower, the high-current charging and discharging capacity is obviously improved, the low-temperature performance is obviously improved, and the service life of the battery is prolonged.
h) According to the invention, the partition plate between the positive plate and the negative plate is set to be the superfine glass fiber plate, and the thickness of the partition plate is optimized, so that the assembly pressure of a pole group and the uniform oxygen recombination efficiency during the recycling process of the battery are ensured, meanwhile, the layering problem of electrolyte can be effectively reduced, and the service life of the battery can be effectively prolonged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a diagram illustrating the effect of a negative plate tab pinched out by the method of the present invention;
fig. 2 is a front view of a negative plate tab pinched using the method provided by the present invention;
fig. 3 is a left side view of a negative plate tab pinched out using the method provided by the present invention;
FIG. 4 is a partial view at A of FIG. 3;
fig. 5 is a top view of a negative plate tab pinched out using the method provided by the present invention;
FIG. 6 is a view taken along line A-A of FIG. 5;
FIG. 7 is the effect intention of the negative plate on each electrode group side of the battery after the electrode tabs are well pinched;
fig. 8 is a partial view at B in fig. 7.
Reference numerals:
a-the length of the upper frame of the bending point off-edge negative plate; b, bending the length of the tab in the vertical direction; c, bending the length of the lug in the vertical direction; d-horizontal offset distance; a-the angle of the bend.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
One embodiment of the present invention provides a method for pinching tabs by using a negative plate, as shown in fig. 1 to 8, comprising the following steps:
step 1: selecting a bending point at a specific position on the upper part of the upper frame of the edge negative plate, wherein the length A of the bending point from the upper frame of the edge negative plate is 1-3mm, and the lug at the distance has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, wherein the bending angle a ranges from 120 degrees to 140 degrees, and the length B of the bent tab in the vertical direction is 4-4.5 mm;
and step 3: and (3) bending the upper part of the negative plate electrode lug on the basis of the step (2), wherein the horizontal offset distance D of the section of electrode lug is 0.5-1mm, and the length C of the bent electrode lug in the vertical direction is 6.5-7 mm.
Compared with the prior art, the method for pinching the tabs by the edge negative plate can effectively avoid the problem of glue leakage after the battery is sealed, and is beneficial to prolonging the service life of the battery.
Particularly, the length A of the bending point at the upper part of the upper frame of the edge negative plate away from the upper frame of the edge negative plate is controlled, so that the pole ear cannot crush the partition plate after the pole group is cast and welded, and the phenomenon of glue climbing of the edge negative plate cannot occur. Illustratively, A is 1-3 mm. Under the normal production condition, the separator is generally 1-2mm higher than the upper frame of the positive plate, if the bending point is too low (A is less than 1mm), the tab of the plate group after cast welding can crush the separator, and meanwhile, the root part of the tab is easy to crush and fall paste, thereby influencing the service life of the battery; if the bending point is too high (A is more than 3mm), the bottom of the negative plate electrode lug is tightly attached to the plastic shell barrier after the electrode group is cast and welded, and the negative plate is easy to climb glue after the battery is sealed by glue. While a bending point A of 1-3mm avoids the above problems, and the cast-weld effect is shown in FIG. 8.
Considering that if the bending angle is not controlled reasonably, cast welding or false welding is easy to occur after the tab is pinched, or the negative plate adhesive climbing occurs after the battery is sealed, the bending angle a is strictly controlled to be 120-140 degrees. Specifically, if the bending angle is too small (a is less than 120 degrees), the top of the negative plate tab after the tab is pinched is directly leaned below the top of the adjacent tab, so that cast welding and sheet dropping or false welding are easy to occur; if the bending angle is too large (a is more than 140 degrees), the tab is closer to the plastic shell partition after the tab is pinched, and the negative plate is easy to climb glue after the battery is sealed by glue. The preferred bend angle is 135 °.
It is worth noting that in the step 2, if the length B of the bent tab in the vertical direction is too small (B is less than 4mm), the tab pinching effect cannot be achieved; if the length B of the bent tab in the vertical direction is too large (B is more than 5mm), the negative plate tab after the tab is pinched is almost close to the adjacent tab, and cast welding and tab dropping or false welding are easy to occur. Therefore, the range of the length B in the vertical direction of the bent tab is controlled to be 4-4.5mm, so that the tab can be pinched after the tab is pinched, and the cast welding and sheet dropping or false welding are not easy to occur. The length B of the bent tab in the vertical direction is preferably 4.5mm, and the cast-weld effect is shown in fig. 6.
Considering that the length of the horizontal offset distance D of the segment of the tab is too large or too small, which adversely affects the battery, the present embodiment controls D to be in the range of 0.5 to 1 mm. Particularly, when the horizontal offset distance of the section of the tab is too large, the negative plate tab after the tab is pinched is almost leaned against the adjacent tab, and cast welding and sheet dropping or false welding are easy to occur; when the horizontal offset distance of the section of the tab is too small, the tab pinching effect cannot be achieved. The horizontal offset distance of the section of the pole lug is controlled to be 0.5-1mm, the maximum distance of the pole lug of the side negative plate from the plastic shell can be ensured, meanwhile, the top of the pole lug is not close to the adjacent pole lug, and the glue climbing and cast welding chip dropping of the side negative plate can be avoided.
Because the total length of the edge negative plate tab is fixed, the tab length occupied in the step 1 and the step 2 is the length C in the vertical direction of the bent tab.
Can be according to the corresponding utmost point ear mould of holding between the fingers of shape preparation that utmost point ear is buckled in actual production, cooperation punching press and positioner can once only hold between the fingers utmost point ear in order to adapt to serialization production to utmost point crowd's negative plate in succession.
Example one
Step 1: the position on the upper frame of the edge negative plate and the position which is 1mm away from the upper frame of the edge negative plate are taken as bending points, and the lug at the distance of the section has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, wherein the bending angle is 120 degrees, and the length B of the bent tab in the vertical direction is 4 mm;
and step 3: and (3) bending the upper part of the negative plate tab on the basis of the step (2), wherein the horizontal offset distance of the tab of the section is 0.5mm, and the tab pinching is completed.
Example two
Step 1: the position on the upper frame of the edge negative plate and 3mm away from the upper frame of the edge negative plate is taken as a bending point, and the lug at the distance of the section has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, wherein the bending angle is 140 degrees, and the length B of the bent tab in the vertical direction is 4.5 mm;
and step 3: and (3) bending the upper part of the negative plate tab on the basis of the step (2), wherein the horizontal offset distance of the tab of the section is 1mm, and the tab pinching is completed.
EXAMPLE III
Step 1: the position on the upper frame of the edge negative plate and 2mm away from the upper frame of the edge negative plate is taken as a bending point, and the lug at the distance of the section has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, wherein the bending angle is 135 degrees, and the length B of the bent tab in the vertical direction is 4.2 mm;
and step 3: and (3) bending the upper part of the negative plate tab on the basis of the step (2), wherein the horizontal offset distance of the tab of the section is 0.8mm, and the tab pinching is completed.
The invention further discloses a storage battery, which comprises a shell and a battery pole group arranged in the shell, wherein the tabs of the negative plate on the side of the battery pole group are kneaded by the method of the first embodiment to the third embodiment.
Specifically, the battery electrode group of the present embodiment includes a positive electrode plate, a negative electrode plate, a positive electrode tab, a negative electrode tab, and a separator; the quantity of the positive plates and the negative plates is multiple, the positive plates and the negative plates are arranged alternately, the partition plates are arranged between the positive plates and the negative plates, the bottoms of every two adjacent partition plates are connected to form a U-shaped structure, and the positive plates are wrapped in the U-shaped structure; the positive electrode lugs and the negative electrode lugs are arranged at two opposite ends of the electrode group and are arranged in multiple rows. The number of the battery pole groups is multiple, and the tabs among the multiple battery pole groups are of a direct connection cast-weld structure.
The battery of prior art generally adopts the gap bridge welding, and the non-one shot forming of gap bridge welding to the busbar is longer, and the utmost point ear of a plurality of battery utmost point crowd of this embodiment battery adopts directly to link the cast joint structure, compares with the gap bridge welding, directly links the cast joint and has following advantage: (1) the battery is cast and welded once, so that the rejection rate is low; (2) the length of the bus bar is shorter, the lead consumption is less, the internal resistance is smaller, the discharge current of the battery is larger under the same condition, and the power is stronger; (3) the battery terminal post is sealed without a sealing ring, and the terminal does not leak liquid.
It should be noted that, in the storage battery of this embodiment, the separator between the positive electrode plate and the negative electrode plate is an ultra-fine glass microfiber (AGM) plate, and the thickness of the separator is optimized, so that the assembly pressure of the electrode group and the uniform oxygen recombination efficiency during the recycling process of the battery are ensured, and meanwhile, the problem of electrolyte stratification can be effectively reduced, and the service life of the battery can be effectively prolonged. Illustratively, the separator has a thickness of 1.30-1.34 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A method for pinching tabs by a negative plate is characterized by comprising the following steps:
step 1: selecting a bending point at the upper part of the upper frame of the edge negative plate, wherein the bending point is away from the upper frame of the edge negative plate by a certain distance, and the tab of the distance section has no horizontal deviation;
step 2: bending the tab at the bending point in the step 1, and controlling the bending angle and the length of the bent tab in the vertical direction;
and step 3: bending the upper part of the negative plate tab on the basis of the step 2, controlling the horizontal offset distance of the tab of the section, and pinching the tab;
in the step 1, the bending point is 1-3mm away from the upper frame of the negative plate;
in the step 2, the bending angle is 120-140 degrees;
in the step 2, the length of the bent tab in the vertical direction is 4-4.5 mm.
2. The method for pinching the tabs by the negative plates as claimed in claim 1, wherein in the step 2, the bending angle is 135 degrees.
3. The method for pinching the tabs by the negative plates as claimed in claim 1, wherein in the step 3, the horizontal offset distance is 0.5-1 mm.
4. The method for pinching the tabs by the negative plates according to any one of claims 1 to 3, wherein in the step 2, the length of the bent tabs in the vertical direction is 4.5 mm.
5. An accumulator, characterized in that, it comprises a shell and a battery pole group arranged in the shell, the pole ear of the battery pole group negative plate is kneaded by the method of any claim 1-4.
6. The battery of claim 5, wherein the battery pole groups comprise positive plates, negative plates, positive tabs, negative tabs, and separators;
the quantity of the positive plates and the negative plates is multiple, the positive plates and the negative plates are alternately arranged, partition plates are arranged between the positive plates and the negative plates, the bottoms of every two adjacent partition plates are connected to form a U-shaped structure, and the positive plates are wrapped in the U-shaped structure;
the positive electrode lugs are arranged on the upper edge of the positive plate, the negative electrode lugs are arranged on the upper edge of the negative plate, and the positive electrode lugs and the negative electrode lugs are arranged in multiple rows;
the quantity of battery utmost point crowd is a plurality of, and the utmost point ear between a plurality of battery utmost point crowd adopts directly to link the cast joint structure.
7. The battery of claim 6, wherein the separator is a microglass fiber board.
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| CN201910465123.5A CN110165135B (en) | 2019-05-30 | 2019-05-30 | Storage battery and negative plate tab pinching method thereof |
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| CN201910465123.5A CN110165135B (en) | 2019-05-30 | 2019-05-30 | Storage battery and negative plate tab pinching method thereof |
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| CN110165135B true CN110165135B (en) | 2022-02-01 |
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| CN204088461U (en) * | 2014-08-29 | 2015-01-07 | 天能集团江苏科技有限公司 | A kind of accumulator plate being convenient to lug bending |
| CN204905342U (en) * | 2015-08-05 | 2015-12-23 | 天能电池集团有限公司 | Cylinder type lithium ion battery utmost point ear and lithium ion battery who uses this utmost point ear |
| CN205542962U (en) * | 2016-02-05 | 2016-08-31 | 北京长城华冠汽车科技股份有限公司 | Battery module, lithium ion battery and including this lithium ion battery's car |
| CN106583508B (en) * | 2016-11-22 | 2019-06-28 | 深圳吉阳智能科技有限公司 | The automatic bending mechanism of power battery tab and its working method |
| US20190067648A1 (en) * | 2017-08-31 | 2019-02-28 | Nio Usa, Inc. | Battery cell with aluminium case |
| CN109550817B (en) * | 2018-12-24 | 2023-11-14 | 江苏春兰清洁能源研究院有限公司 | Bending device and bending method for lithium battery bipolar group tab |
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| CN2517117Y (en) * | 2001-12-24 | 2002-10-16 | 吴捷 | Valve control lead-acid battery |
| CN101913125A (en) * | 2010-08-11 | 2010-12-15 | 肇庆理士电源技术有限公司 | Pliers and method for manufacturing storage battery by using same |
| CN109037573A (en) * | 2018-08-09 | 2018-12-18 | 清陶（昆山）新能源材料研究院有限公司 | A kind of folding preparation process suitable for flexible battery tab |
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Address after: 313199 Pheasant Town Emerging Industrial Park, Changxing County, Huzhou City, Zhejiang Province Patentee after: Chaowei Power Group Co.,Ltd. Address before: 313199 Pheasant Town Emerging Industrial Park, Changxing County, Huzhou City, Zhejiang Province Patentee before: CHILWEE POWER Co.,Ltd. |