CN219393638U - High-capacity square battery - Google Patents
High-capacity square battery Download PDFInfo
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- CN219393638U CN219393638U CN202320740349.3U CN202320740349U CN219393638U CN 219393638 U CN219393638 U CN 219393638U CN 202320740349 U CN202320740349 U CN 202320740349U CN 219393638 U CN219393638 U CN 219393638U
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a large-capacity square battery, which comprises a shell, a winding core and a top cover; at least one winding core group is arranged in the shell in a stacking manner along the height direction of the winding core group, the winding core group comprises at least two winding cores which are arranged along the thickness direction of the shell, the winding cores are arranged on the side, and the two ends of the winding cores along the length direction of the shell are respectively provided with a positive electrode lug and a negative electrode lug; the device also comprises a positive electrode rotating sheet and a negative electrode rotating sheet, wherein one end of the positive electrode rotating sheet is connected with the positive electrode lugs of the plurality of winding cores in parallel, and the other end of the positive electrode rotating sheet is connected with the positive electrode post; one end of the negative electrode switching sheet is connected with the negative electrode lugs of the plurality of winding cores in parallel, and the other end of the negative electrode switching sheet is connected with the negative electrode column. The utility model can realize the design requirements of high capacity and multiplying power of the square battery, and simultaneously, on the basis that the thickness and the length dimension of the winding core are kept unchanged, only the height of the shell is required to be developed and designed, the top cover is not required to be developed again, and the development cost of the square battery can be reduced.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a large-capacity square battery.
Background
Square battery contains the shell generally, rolls up core and top cap, rolls up the core and is located the shell and encapsulates by the top cap, and the top cap includes lamina tecti and sets up the utmost point post on lamina tecti, and the utmost point post is connected with the utmost point ear of rolling up the core, through with utmost point post with external power consumption device connection in order to supply power or charge with external power connection when using.
In the related art, in order to improve the cruising ability, a double-winding core is generally connected in parallel in a shell to improve the capacity of a square battery, thereby improving the power supply cruising of an electric terminal. The lugs of the two winding cores inside the square battery are connected with the pole posts on the top cover mainly through the switching piece. Although the square battery can improve the capacity and the multiplying power to a certain extent, the square battery still cannot meet the requirements of larger capacity and quick charge at the present stage.
In order to improve the capacity and the quick charge performance of the square battery, the whole capacity of the square battery is usually improved by increasing the thickness and/or the length of a single winding core, however, the single winding core is limited by the prior art, the larger the thickness is, the more difficult the yield is to control, the cost of the winding core is increased, and meanwhile, the thickness and the length are increased, and the shell and the top cover are required to be redeveloped, so that the development cost is further increased.
Disclosure of Invention
In view of this, the present utility model provides a large-capacity prismatic battery, which improves capacity and rate performance and reduces development cost of the prismatic battery.
The technical scheme of the utility model is realized as follows:
the utility model provides a large-capacity square battery which comprises a shell, a winding core and a top cover, wherein the winding core is arranged in the shell;
at least one winding core group is arranged in the shell in a stacking manner along the height direction of the winding core group, the winding core group comprises at least two winding cores which are arranged along the thickness direction of the shell, the winding cores are arranged on the side, and the two ends of the winding cores along the length direction of the shell are respectively provided with a positive electrode lug and a negative electrode lug;
the winding core is characterized by further comprising a positive electrode switching sheet and a negative electrode switching sheet, wherein one end of the positive electrode switching sheet is connected with positive electrode lugs of the winding core in parallel, and the other end of the positive electrode switching sheet is connected with the positive electrode post;
one end of the negative electrode switching sheet is connected with the negative electrode lugs of the plurality of winding cores in parallel, and the other end of the negative electrode switching sheet is connected with the negative electrode column.
On the basis of the technical scheme, preferably, the positive electrode switching piece comprises a first positive electrode connecting piece and a second positive electrode connecting piece, wherein the first positive electrode connecting piece is of an L-shaped structure, one end of the first positive electrode connecting piece is welded with the positive electrode post, the other end of the first positive electrode connecting piece is welded with one end of the second positive electrode connecting piece, and one end, far away from the first positive electrode connecting piece, of the second positive electrode connecting piece is connected with positive electrode lugs of the plurality of winding cores in parallel;
the negative electrode adapter piece comprises a first negative electrode connecting piece and a second negative electrode connecting piece, the first negative electrode connecting piece is of an L-shaped structure, one end of the first negative electrode connecting piece is welded with the negative electrode column, the other end of the first negative electrode connecting piece is welded with one end of the second negative electrode connecting piece, and one end, far away from the first negative electrode connecting piece, of the second negative electrode connecting piece is connected with the negative electrode lugs of the plurality of winding cores in parallel.
Further, preferably, the surface of the second positive electrode connecting piece is provided with a positive electrode through groove for the positive electrode lug to pass through, and the surface of the second negative electrode connecting piece is provided with a negative electrode through groove for the negative electrode lug to pass through.
Still further, preferably, the second positive electrode connecting piece comprises at least two positive electrode welding sheets vertically arranged side by side, the surface of the positive electrode welding sheet faces the side wall of the length direction of the winding core, and the positive electrode through grooves are arranged at intervals along the length direction of the positive electrode welding sheet;
the second negative electrode connecting piece comprises at least two negative electrode welding sheet bodies which are vertically arranged side by side, the surface of the negative electrode welding sheet body faces the side wall of the length direction of the winding core, and the negative electrode through grooves are arranged at intervals along the length direction of the negative electrode welding sheet body.
On the basis of the technical scheme, preferably, welding positioning structures are arranged between the first positive electrode connecting sheet and the second positive electrode connecting sheet and between the first negative electrode connecting sheet and the second negative electrode connecting sheet.
Preferably, the positive electrode through groove is in clearance fit with the positive electrode lug, and the negative electrode through groove is in clearance fit with the negative electrode lug.
On the basis of the technical scheme, preferably, the top cover further comprises a positive electrode fixing component and a negative electrode fixing component, the positive electrode fixing component is used for fixing the positive electrode post at one end of the length direction of the cover plate, the negative electrode fixing component is used for fixing the negative electrode post at the other end of the length direction of the cover plate, the first positive electrode connecting piece is connected with the positive electrode post through the positive electrode fixing component, and the first negative electrode connecting piece is connected with the negative electrode post through the negative electrode fixing component.
Further, preferably, the positive electrode fixing component comprises a positive electrode upper plastic part, a positive electrode lower plastic part and a positive electrode riveting part, the positive electrode post, the positive electrode upper plastic part, the cover plate and the positive electrode lower plastic part are sequentially riveted through the positive electrode riveting part, and one end, far away from the second positive electrode connecting piece, of the first positive electrode connecting piece is welded with the positive electrode riveting part;
the negative electrode fixing assembly comprises a negative electrode upper plastic part, a negative electrode lower plastic part and a negative electrode riveting part, wherein the negative electrode column, the negative electrode upper plastic part, the cover plate and the negative electrode lower plastic part are sequentially riveted through the negative electrode riveting part, and one end of the first negative electrode connecting sheet, which is far away from the second negative electrode connecting sheet, is welded with the negative electrode riveting part.
Further, preferably, the positive pole is arranged in a strip shape, and two positive pole riveting pieces are arranged; the negative pole post is the bar setting, and anodal riveting spare is provided with two.
Further, preferably, the first positive electrode connecting piece is provided with a positive electrode connecting hole, the positive electrode riveting piece is provided with a positive electrode connecting portion matched with the positive electrode connecting hole, the first negative electrode connecting piece is provided with a negative electrode connecting hole, and the negative electrode riveting piece is provided with a negative electrode connecting portion matched with the negative electrode connecting hole.
Compared with the prior art, the utility model has the following beneficial effects:
(1) According to the square battery disclosed by the utility model, the positive electrode lugs and the negative electrode lugs are respectively arranged on the two side surfaces of the winding core, at least one winding core group is arranged in the shell in a stacking manner along the height direction, each winding core group is composed of at least two winding cores which are arranged along the thickness direction of the shell, meanwhile, the positive electrode rotating sheets and the negative electrode rotating sheets are respectively arranged vertically at the two ends of the length direction of the shell, one end of each positive electrode rotating sheet is connected with the positive electrode post on the cover plate, the other end of each positive electrode rotating sheet is connected with the positive electrode lugs on all winding cores in parallel, and meanwhile, one end of each negative electrode rotating sheet is connected with the negative electrode post on the cover plate, and the other end of each negative electrode rotating sheet is connected with the negative electrode lugs on all winding cores in parallel.
(2) The positive electrode rotating sheet is arranged to be a first positive electrode connecting sheet and a second positive electrode connecting sheet which are separated, and the negative electrode rotating sheet is arranged to be a first negative electrode connecting sheet and a second negative electrode connecting sheet which are separated, so that the first positive electrode connecting sheet and the first negative electrode connecting sheet can be welded with a positive electrode post and a negative electrode post on a cover plate respectively, at the same time, a positive electrode lug on a winding core and a second positive electrode connecting sheet are welded, the negative electrode lug and the second negative electrode connecting sheet are welded, so that the second positive electrode connecting sheet, the second negative electrode connecting sheet and a plurality of winding cores are assembled to form a whole, then the second positive electrode connecting sheet and the first positive electrode connecting sheet are welded, and the second negative electrode connecting sheet and the first negative electrode connecting sheet are welded, thereby improving the assembly operability of the whole square battery and the assembly efficiency of the square battery;
(3) The positive electrode through groove for the positive electrode lug to pass through is formed in the surface of the second positive electrode connecting piece, the negative electrode through groove for the negative electrode lug to pass through is formed in the surface of the second negative electrode connecting piece, and the battery lug is passed through the through groove and bent during ultrasonic welding, so that the battery lug can be contacted with the front side and the back side of the connecting piece, the front side and the back side of the connecting piece can be welded with the battery lug, the welding area is increased to be two times as much as the welding area, and the overcurrent capacity of the welding position of the battery lug and the connecting piece is improved in a multiplied manner; meanwhile, the battery lugs penetrate through the through grooves and are welded on the front side and the back side of the connecting piece, so that the connection strength between the battery lugs and the connecting piece is improved;
(4) The second positive electrode connecting piece is arranged to be at least two positive electrode welding pieces which are mutually separated, and the second negative electrode connecting piece is arranged to be at least two negative electrode welding pieces which are mutually separated, so that a winding core which is arranged up and down conveniently can be respectively in tab through groove operation with the positive electrode welding pieces and the negative electrode welding pieces, and meanwhile, the battery tabs are conveniently bent after passing through the through grooves to be in contact welding with the front and back surfaces of the connecting pieces, and the welding reliability is improved;
(5) The positive pole is arranged in a strip shape, and two positive pole riveting pieces are arranged; the negative pole post is the bar setting, and anodal riveting piece is provided with two, can improve the overflow ability of positive pole post and negative pole post.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a prismatic battery according to the present disclosure;
FIG. 2 is a front view of the assembled structure of the winding core, the top cover, the positive electrode transfer sheet and the negative electrode transfer sheet of the present utility model;
fig. 3 is a schematic perspective view of a positive electrode tab and a negative electrode tab according to the present disclosure;
FIG. 4 is an exploded view of the positive electrode tab, the negative electrode tab and the top cover of the present disclosure;
fig. 5 is a schematic perspective view of an assembly structure of a winding core, a top cover, a positive electrode transfer sheet and a negative electrode transfer sheet according to the present utility model;
FIG. 6 is a left side view of the assembled structure of the winding core, the top cover, the positive electrode transfer sheet and the negative electrode transfer sheet of the present utility model;
FIG. 7 is a plan cross-sectional view taken at A-A of FIG. 6;
FIG. 8 is an attachment view of the assembled structure of the winding core, the top cover, the positive electrode tab and the negative electrode tab of the present disclosure;
FIG. 9 is a plan sectional view taken at B-B of FIG. 8;
FIG. 10 is an enlarged view of a portion of FIG. 9 at C;
FIG. 11 is an enlarged view of a portion of FIG. 9 at D;
reference numerals:
1. a housing; 2. a winding core; 3. a top cover; 31. a cover plate; 32. a positive electrode post; 33. a negative electrode column; 21. a positive electrode tab; 22. a negative electrode ear; 4. a positive electrode switching piece; 5. a negative electrode switching sheet; 41. a first positive electrode connecting piece; 42. a second positive electrode connecting piece; 51. a first negative electrode connecting piece; 52. a second negative electrode connecting piece; 420. a positive electrode through groove; 520. a negative electrode through groove; 421. welding a sheet body on the positive electrode; 521. a negative electrode welding sheet body; 34. an anode fixing assembly; 35. a negative electrode fixing assembly; 341. a plastic part is arranged on the positive electrode; 342. the positive electrode is molded; 343. positive electrode riveting piece; 351. a plastic part is arranged on the cathode; 352. a negative electrode lower plastic part; 353. a negative electrode rivet; 411. a positive electrode connection hole; 3431. a positive electrode connection part; 511. a negative electrode connection hole; 3531. and a negative electrode connection part.
Detailed Description
The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.
Referring to fig. 1, in combination with fig. 2, an embodiment of the utility model discloses a large-capacity square battery, which comprises a housing 1, a winding core 2 and a top cover 3, wherein the winding core 2 is arranged in the housing 1, the top cover 3 comprises a cover plate 31, a positive pole 32 and a negative pole 33 which are arranged on the cover plate 31, the cover plate 31 is arranged at an opening end of the housing 1, the positive pole 32 is electrically connected with a positive pole lug 21 of the winding core 2, and the negative pole 33 is electrically connected with a negative pole lug 22 of the winding core 2.
As a conventional technology, in order to increase the capacity of a square battery, a double winding core 2 is generally connected in parallel in a casing 1, and a tab of the winding core 2 is located at the top end, and a tab on a cover plate 31 is connected with a tab of the winding core 2 through a transfer piece.
In the prior art, in order to improve the capacity and the quick charge performance of the square battery, the thickness and/or the length of the single winding core 2 are generally increased to improve the overall capacity of the square battery, however, the single winding core 2 is limited by the prior art, the larger the thickness is, the more difficult the yield is to control, the cost of the winding core 2 is increased, and meanwhile, the thickness and the length are increased, so that the shell 1 and the top cover 3 need to be redeveloped, which further increases the development cost.
For this reason, the present embodiment discloses the following solution in order to solve the above-described problems.
Specifically, in this embodiment, the positive electrode tab 21 and the negative electrode tab 22 are respectively formed on two sides of the length direction of the winding core 2, at least one winding core group is stacked in the height direction in the casing 1, each winding core group is composed of at least two winding cores 2 arranged along the thickness direction of the casing 1, meanwhile, the positive electrode rotating sheet 4 and the negative electrode rotating sheet 5 are vertically arranged on two ends of the length direction in the casing 1, one end of the positive electrode rotating sheet 4 is connected with the positive electrode post 32 on the cover plate 31, the other end of the positive electrode rotating sheet 4 is connected with the positive electrode tabs 21 on all winding cores 2 in parallel, meanwhile, one end of the negative electrode rotating sheet 5 is connected with the negative electrode post 33 on the cover plate 31, and the other end of the negative electrode rotating sheet 5 is connected with the negative electrode tabs 22 on all winding cores 2 in parallel.
Therefore, the design requirements of high capacity and multiplying power of the square battery can be met by arranging the plurality of winding cores 2 in parallel in the shell 1, and meanwhile, on the basis that the total thickness dimension of the plurality of winding cores 2 is kept unchanged, only the height of the shell 1 is required to be developed and designed, the top cover 3 is not required to be developed again, and the development cost of the square battery can be reduced.
It is noted that in this embodiment, each winding core group is at least formed by stacking two winding cores 2, the total thickness of the winding cores is matched with the thickness of the casing, the length of the winding cores is matched with the length of the casing, and the winding cores are stacked in the height direction of the casing 1, so that multiple winding cores can be connected in parallel, and when the battery is developed, only the casing needs to be redesigned, and the cover plate does not need to be redesigned.
Since the positive electrode tab 4 and the negative electrode tab 5 are located at both ends of the case 1 in the longitudinal direction, respectively, ultrasonic welding is performed with the tabs on the plurality of winding cores 2, and laser welding is also required with the positive electrode post 32 and the negative electrode post 33 on the cap plate 31. Thus, the operation needs to be performed first, and the assembly efficiency is low.
For this reason, referring to fig. 3, the present embodiment is configured by providing the positive electrode tab 4 as the first and second separated positive electrode tabs 41 and 42, while providing the negative electrode tab 5 as the first and second separated negative electrode tabs 51 and 52. The first positive electrode connecting piece 41 and the first negative electrode connecting piece 51 are both in L-shaped structures, the first positive electrode connecting piece 41 is welded with the positive electrode post 32 on the cover plate 31 first, and the first negative electrode connecting piece 51 is welded with the negative electrode post 33 on the cover plate 31. At the same time, the positive tab 21 and the second positive connection piece 42 on the winding core 2 are welded, the negative tab 22 and the second negative connection piece 52 are welded, so that the second positive connection piece 42, the second negative connection piece 52 and the winding cores 2 are assembled to form a whole, then the second positive connection piece 42 and the first positive connection piece 41 are welded, and the second negative connection piece 52 and the first negative connection piece 51 are welded, thereby improving the assembly operability of the whole square battery and the assembly efficiency of the square battery.
In this embodiment, the surfaces of the positive electrode tab 21 and the second positive electrode connecting piece 42 are welded by ultrasonic, the surfaces of the negative electrode tab 22 and the second negative electrode connecting piece 52 are welded by ultrasonic, the connecting piece and the tab are welded by single face, the welding area is limited by the size of the connecting piece, the welding area can directly influence the overcurrent capacity of the battery, the charge and discharge capacity of the square battery is reduced, and meanwhile, the connecting piece and the tab are welded by single face ultrasonic, so that the overall structural strength is weaker.
For this reason, referring to fig. 4-7, in this embodiment, by providing the positive electrode through slot 420 for the positive electrode tab 21 to pass through on the surface of the second positive electrode connecting piece 42, providing the negative electrode through slot 520 for the negative electrode tab 22 to pass through on the surface of the second negative electrode connecting piece 52, the battery tab passes through the through slot and is bent during ultrasonic welding, so that the battery tab can be contacted with the front and back surfaces of the connecting piece, and both the front and back surfaces of the connecting piece can be welded with the battery tab, which is equivalent to directly doubling the welding area, and doubly improving the overcurrent capacity of the welding position of the battery tab and the connecting piece; meanwhile, the battery lugs penetrate through the through grooves and are welded on the front side and the back side of the connecting piece, so that the connection strength of the battery lugs and the connecting piece is improved.
In this embodiment, the positive electrode through groove 420 is in clearance fit with the positive electrode tab 21, and the negative electrode through groove 520 is in clearance fit with the negative electrode tab 22. With this arrangement, the positive electrode tab 21 can be easily inserted into the positive electrode through groove 420, and the negative electrode tab 22 can be easily inserted into the negative electrode through groove 520.
Because the second positive connection piece 42 covers all the positive lugs 21 of the winding cores 2, when a plurality of winding cores 2 are bent through the grooves on the same second positive connection piece 42, the space between the second positive connection piece 42 and the winding cores 2 is limited, so that on one hand, the inconvenient positive lugs 21 are bent on one side of the second positive connection piece 42 towards the winding cores 2, and on the other hand, the contact between the positive lugs 21 and one side of the second positive connection piece 42 towards the winding cores 2 is not well ensured, and the contact is unstable, and on the other hand, the inconvenient welding equipment stretches into between the second positive connection piece 42 and the winding cores 2 to weld.
Similarly, the second negative electrode connection pieces 52 cover one side of the negative electrode lugs 22 of all winding cores 2, so when the winding cores 2 are bent through the grooves in the same second negative electrode connection piece 52, on one hand, the space between the second negative electrode connection pieces 52 and the winding cores 2 is limited, and on the other hand, the inconvenient negative electrode lugs 22 are bent on one side of the second negative electrode connection pieces 52, which faces the winding cores 2, so that the contact between the negative electrode lugs 22 and one side of the second negative electrode connection pieces 52, which faces the winding cores 2, cannot be well ensured, is unstable, and on the other hand, the inconvenient welding equipment stretches into the space between the second negative electrode connection pieces 52 and the winding cores 2 to weld.
For this reason, in the present embodiment, the second positive electrode connecting piece 42 is provided as at least two side-by-side vertical positive electrode welding pieces 421, the surface of the positive electrode welding pieces 421 faces the side wall of the winding core 2 in the length direction, and the positive electrode through grooves 420 are arranged at intervals along the length direction of the positive electrode welding pieces 421. Therefore, each positive electrode welding sheet 421 corresponds to the plurality of winding cores 2 in the height direction of the casing 1, so that when the tab welding is performed, the plurality of winding cores 2 lie flat, the plurality of winding cores 2 are arranged in a stacked manner in the height direction, the positive electrode welding sheet 421 is horizontally arranged on one side of the winding cores 2, after the positive electrode tab 21 of the winding core 2 passes through the positive electrode through groove 420, the positive electrode tab 21 and the two sides of the positive electrode welding sheet 421 are bonded by bending, the welding can be performed by means of the welding fixture, and after the welding is completed, the positive electrode welding sheet 421 can be bonded on the side surface of the winding cores 2 by bending.
Similarly, the second negative electrode connecting piece 52 is provided with at least two parallel vertical negative electrode welding pieces 521, the surface of the negative electrode welding pieces 521 faces the side wall of the winding core 2 in the length direction, and the negative electrode through grooves 520 are arranged at intervals along the length direction of the negative electrode welding pieces 521. In this way, each negative electrode welding sheet 521 corresponds to the plurality of winding cores 2 in the height direction of the case 1, so that when tab welding is performed, the plurality of winding cores 2 lie flat, the plurality of winding cores 2 are stacked in the height direction, the negative electrode welding sheet 521 is horizontally arranged on one side of the winding cores 2, the negative electrode tab 22 of the winding core 2 is bent after passing through the negative electrode through groove 520, both sides of the negative electrode tab 22 and the negative electrode welding sheet 521 are bonded, the bonding can be performed by means of the welding jig, both sides of the negative electrode tab 22 and the negative electrode welding sheet 521 are welded, and after the welding is completed, the negative electrode welding sheet 521 can be bonded to the side of the winding core 2 by bending.
After the plurality of winding cores 2, the positive electrode welding sheet 421 and the negative electrode welding sheet 521, which correspond up and down in the height direction of the case 1, are welded, the positive electrode welding sheet 421 and the first positive electrode connecting sheet 41 are welded, and the negative electrode welding sheet 521 and the first negative electrode connecting sheet 51 are welded.
By adopting the technical scheme, the winding core 2 which is arranged up and down conveniently can be respectively in tab through groove operation with the positive electrode welding sheet 421 and the negative electrode welding sheet 521, and meanwhile, the battery tab is conveniently bent after passing through the through groove and is welded with the front side and the back side of the connecting sheet in a contact manner, so that the welding reliability is improved.
In order to make the welding between the first positive electrode connecting piece 41 and the second positive electrode connecting piece 42 and between the first negative electrode connecting piece 51 and the second negative electrode connecting piece 52 stable, the present embodiment is provided with welding positioning structures between the first positive electrode connecting piece 41 and the second positive electrode connecting piece 42 and between the first negative electrode connecting piece 51 and the second negative electrode connecting piece 52.
Specifically, the first positive electrode connecting piece 41 and the second positive electrode connecting piece 42 are provided with mutually butted steps, so that the first positive electrode connecting piece 41 and the second positive electrode connecting piece 42 are mutually connected and anastomosed through the steps, then welding is conveniently carried out, and meanwhile, the structural strength of the positive electrode rotating piece 4 is improved.
Similarly, the first negative electrode connecting piece 51 and the second negative electrode connecting piece 52 are provided with mutually butted steps, so that the first negative electrode connecting piece 51 and the second negative electrode connecting piece 52 are mutually connected and anastomosed through the steps, then welding is convenient to implement, and meanwhile, the structural strength of the negative electrode switching piece 5 is improved.
Of course, the welding positioning structure of the present embodiment is not limited to this, and other manners of aligning the connection pieces by anastomotic connection may be adopted.
In this embodiment, referring to fig. 8-11, the top cover 3 further includes a positive electrode fixing component 34 and a negative electrode fixing component 35, the positive electrode fixing component 34 is used for fixing the positive electrode post 32 at one end of the cover plate 31 in the length direction, the negative electrode fixing component 35 is used for fixing the negative electrode post 33 at the other end of the cover plate 31 in the length direction, the first positive electrode connecting piece 41 is connected with the positive electrode post 32 through the positive electrode fixing component 34, and the first negative electrode connecting piece 51 is connected with the negative electrode post 33 through the negative electrode fixing component 35.
Specifically, the positive electrode fixing assembly 34 includes a positive electrode upper molding member 341, a positive electrode lower molding member 342, and a positive electrode riveting member 343, and the positive electrode post 32, the positive electrode upper molding member 341, the cover plate 31, and the positive electrode lower molding member 342 are sequentially riveted by the positive electrode riveting member 343, and one end of the first positive electrode connecting sheet 41, far from the second positive electrode connecting sheet 42, is welded with the positive electrode riveting member 343. The positive electrode upper molding piece 341 is used for electrically isolating the positive electrode post 32 from the cover plate 31, the positive electrode lower molding piece 342 is used for electrically isolating the winding core 2 from the cover plate 31, meanwhile, the first positive electrode connecting piece 41 is located at the bottom of the positive electrode lower molding piece 342, and the first positive electrode connecting piece 41 and the positive electrode riveting piece 343 are subjected to laser welding.
The negative electrode fixing member 35 includes a negative electrode upper molding member 351, a negative electrode lower molding member 352, and a negative electrode riveting member 353, and the negative electrode post 33, the negative electrode upper molding member 351, the cover plate 31, and the negative electrode lower molding member 352 are sequentially riveted by the negative electrode riveting member 353, and one end of the first negative electrode connecting piece 51, which is far from the second negative electrode connecting piece 52, is welded with the negative electrode riveting member 353. The negative electrode upper molding member 351 is used for electrically isolating the negative electrode post 33 from the cover plate 31, the negative electrode lower molding member 352 is used for electrically isolating the winding core 2 from the cover plate 31, and meanwhile, the first negative electrode connecting sheet 51 is located at the bottom of the negative electrode lower molding member 352, and the first negative electrode connecting sheet 51 and the negative electrode riveting member 353 are subjected to laser welding.
As some preferred embodiments, the positive pole 32 is arranged in a strip shape, and the positive pole rivet 343 is provided with two; the negative electrode column 33 is provided in a strip shape, and the positive electrode rivet 343 is provided in two. The first positive electrode connecting piece 41 is electrically connected with the positive electrode column 32 through the two positive electrode riveting pieces 343, the first negative electrode connecting piece 51 is electrically connected with the negative electrode column 33 through the two negative electrode riveting pieces 353, the contact area is larger, and the overcurrent capacity of the positive electrode column 32 and the negative electrode column 33 is improved.
In order to facilitate welding of the first positive electrode connecting piece 41 and the positive electrode riveting piece 343, a positive electrode connecting hole 411 is formed in the first positive electrode connecting piece 41, and a positive electrode connecting portion 3431 matched with the positive electrode connecting hole 411 is formed in the positive electrode riveting piece 343. The positive electrode connecting portion 3431 is in a cylindrical shape, the horizontal section of the first positive electrode connecting sheet 41 is horizontally arranged on the bottom surface of the positive electrode lower plastic part 342, the positive electrode connecting portion 3431 penetrates through the positive electrode connecting hole 411, and the positive electrode connecting portion 3431 and the positive electrode connecting hole are matched with each other, so that the welding is conveniently performed at the assembling position while the positioning is achieved.
In order to facilitate welding of the first negative electrode connection piece 51 and the negative electrode rivet 353, a negative electrode connection hole 511 is provided in the first negative electrode connection piece 51, and a negative electrode connection portion 3531 that is matched with the negative electrode connection hole 511 is provided in the negative electrode rivet 353. The negative electrode connecting portion 3531 is in a cylindrical arrangement, the horizontal section of the first negative electrode connecting piece 51 is horizontally arranged on the bottom surface of the negative electrode lower plastic part 352, the negative electrode connecting portion 3531 penetrates through the negative electrode connecting hole 511, and the negative electrode connecting portion 3531 and the negative electrode connecting hole are matched with each other, so that the welding is conveniently performed at the assembling position while the positioning is achieved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. The utility model provides a large capacity square battery, it includes casing (1), reel core (2) and top cap (3), reel core (2) set up in casing (1), top cap (3) are including apron (31) and positive pole post (32) and negative pole post (33) of setting on apron (31);
the method is characterized in that: at least one winding core group is arranged in the shell (1) in a stacking manner along the height direction of the winding core group, the winding core group comprises at least two winding cores (2) which are arranged along the thickness direction of the shell (1), the winding cores (2) are arranged on the side, and positive lugs (21) and negative lugs (22) are respectively arranged at two ends of the winding cores (2) along the length direction of the shell (1);
the winding core further comprises a positive electrode rotating sheet (4) and a negative electrode rotating sheet (5), wherein one end of the positive electrode rotating sheet (4) is connected with the positive electrode lugs (21) of the winding cores (2) in parallel, and the other end of the positive electrode rotating sheet (4) is connected with the positive electrode column (32);
one end of the negative electrode switching sheet (5) is connected with the negative electrode lugs (22) of the plurality of winding cores (2) in parallel, and the other end of the negative electrode switching sheet (5) is connected with the negative electrode column (33).
2. The high-capacity prismatic battery according to claim 1, wherein: the positive electrode rotating sheet (4) comprises a first positive electrode connecting sheet (41) and a second positive electrode connecting sheet (42), the first positive electrode connecting sheet (41) is of an L-shaped structure, one end of the first positive electrode connecting sheet (41) is welded with the positive electrode column (32), the other end of the first positive electrode connecting sheet (41) is welded with one end of the second positive electrode connecting sheet (42), and one end, far away from the first positive electrode connecting sheet (41), of the second positive electrode connecting sheet (42) is connected with the positive electrode lugs (21) of the winding cores (2) in parallel;
the negative electrode switching piece (5) comprises a first negative electrode connecting piece (51) and a second negative electrode connecting piece (52), the first negative electrode connecting piece (51) is of an L-shaped structure, one end of the first negative electrode connecting piece (51) is welded with the negative electrode column (33), the other end of the first negative electrode connecting piece (51) is welded with one end of the second negative electrode connecting piece (52), and one end, far away from the first negative electrode connecting piece (51), of the second negative electrode connecting piece (52) is connected with the negative electrode lugs (22) of the plurality of winding cores (2) in parallel.
3. The high-capacity prismatic battery according to claim 2, wherein: positive electrode through grooves (420) for the positive electrode lugs (21) to pass through are formed in the surface of the second positive electrode connecting sheet (42), and negative electrode through grooves (520) for the negative electrode lugs (22) to pass through are formed in the surface of the second negative electrode connecting sheet (52).
4. A high capacity prismatic battery according to claim 3, wherein: the second positive electrode connecting piece (42) comprises at least two positive electrode welding sheet bodies (421) which are vertically arranged side by side, the surface of each positive electrode welding sheet body (421) faces the side wall of the length direction of the winding core (2), and positive electrode through grooves (420) are arranged at intervals along the length direction of each positive electrode welding sheet body (421);
the second negative electrode connecting piece (52) comprises at least two negative electrode welding pieces (521) which are vertically arranged side by side, the surface of the negative electrode welding pieces (521) faces the side wall of the length direction of the winding core (2), and the negative electrode through grooves (520) are arranged at intervals along the length direction of the negative electrode welding pieces (521).
5. The high-capacity prismatic battery according to claim 2, wherein: welding positioning structures are arranged between the first positive electrode connecting sheet (41) and the second positive electrode connecting sheet (42) and between the first negative electrode connecting sheet (51) and the second negative electrode connecting sheet (52).
6. A high capacity prismatic battery according to claim 3, wherein: the positive electrode through groove (420) is in clearance fit with the positive electrode lug (21), and the negative electrode through groove (520) is in clearance fit with the negative electrode lug (22).
7. The high-capacity prismatic battery according to claim 2, wherein: top cap (3) still include positive pole fixed subassembly (34) and negative pole fixed subassembly (35), positive pole fixed subassembly (34) are used for fixing positive pole post (32) at apron (31) length direction one end, negative pole fixed subassembly (35) are used for fixing negative pole post (33) at apron (31) length direction other end, positive pole connection piece (41) are connected with positive pole post (32) through positive pole fixed subassembly (34), first negative pole connection piece (51) are connected with negative pole post (33) through negative pole fixed subassembly (35).
8. The high-capacity prismatic battery according to claim 7, wherein: the positive electrode fixing assembly (34) comprises a positive electrode upper plastic part (341), a positive electrode lower plastic part (342) and a positive electrode riveting part (343), wherein the positive electrode column (32), the positive electrode upper plastic part (341), the cover plate (31) and the positive electrode lower plastic part (342) are sequentially riveted through the positive electrode riveting part (343), and one end, far away from the second positive electrode connecting sheet (42), of the first positive electrode connecting sheet (41) is welded with the positive electrode riveting part (343);
the negative electrode fixing assembly (35) is characterized in that a negative electrode upper plastic part (351), a negative electrode lower plastic part (352) and a negative electrode riveting part (353), the negative electrode column (33), the negative electrode upper plastic part (351), the cover plate (31) and the negative electrode lower plastic part (352) are sequentially riveted through the negative electrode riveting part (353), and one end, far away from the second negative electrode connecting piece (52), of the first negative electrode connecting piece (51) is welded with the negative electrode riveting part (353).
9. The high-capacity prismatic battery according to claim 8, wherein: the positive pole posts (32) are arranged in a strip shape, and two positive pole riveting pieces (343) are arranged; the negative pole post (33) is the bar setting, and anodal riveting piece (343) are provided with two.
10. The large-capacity prismatic battery according to claim 8 or 9, wherein: be provided with anodal connecting hole (411) on first anodal connection piece (41), be provided with on anodal riveting spare (343) with anodal connecting hole (411) matched with anodal connecting portion (3431), be provided with negative pole connecting hole (511) on first negative pole connection piece (51), be provided with on negative pole riveting spare (353) with negative pole connecting portion (3531) of negative pole connecting hole (511) matched with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320740349.3U CN219393638U (en) | 2023-04-06 | 2023-04-06 | High-capacity square battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320740349.3U CN219393638U (en) | 2023-04-06 | 2023-04-06 | High-capacity square battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219393638U true CN219393638U (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320740349.3U Active CN219393638U (en) | 2023-04-06 | 2023-04-06 | High-capacity square battery |
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| Country | Link |
|---|---|
| CN (1) | CN219393638U (en) |
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2023
- 2023-04-06 CN CN202320740349.3U patent/CN219393638U/en active Active
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