CN218069953U - Square power battery - Google Patents
Square power battery Download PDFInfo
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- CN218069953U CN218069953U CN202221934853.9U CN202221934853U CN218069953U CN 218069953 U CN218069953 U CN 218069953U CN 202221934853 U CN202221934853 U CN 202221934853U CN 218069953 U CN218069953 U CN 218069953U
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- utmost point
- point ear
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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 utility model discloses a square power battery, including naked electric core, naked electric core includes first naked electric core group and second naked electric core group, first naked electric core group includes a plurality of first naked electric cores, second naked electric core group includes a plurality of second naked electric cores, first naked electric core includes first negative pole piece and first positive pole piece, second naked electric core includes second positive pole piece and second negative pole piece, first negative pole utmost point ear on first negative pole piece, first negative pole utmost point ear on the second negative pole piece, first positive pole utmost point ear on the first positive pole piece and second positive pole utmost point ear on the second positive pole piece all stagger and set up, utmost point ear between two naked electric cores passes through the connection piece and connects; the utility model discloses the welding is more reliable, under the condition of guaranteeing naked electric core utmost point ear of ultrasonic welding and flexible coupling piece reliability, realizes multilayer utmost point ear welding, like electric core aluminium utmost point ear or copper lug ultrasonic welding more than 70 layers, solves super thick utmost point ear ultrasonic welding rosin joint problem.
Description
Technical Field
The utility model relates to an electrochemistry energy memory field, in particular to square power battery.
Background
Under the global policies of low-carbon economy and carbon neutralization, strategic plans for supporting new energy automobiles and new energy power generation and energy storage development are proposed in countries and regions of main global economy bodies, and the battery industry is increased explosively.
The energy density of the square battery is high, so that the proportion of 2019-2021 in the loading amount of the power battery is always kept above 80%, and the square battery is the battery form which is most widely applied in the market.
The existing square power battery tab welding structure is mainly welded together with a butterfly-shaped flexible connection, usually, two naked battery cell tabs are prewelded firstly, the naked battery cell tabs are welded together, then the two naked battery cell tabs are welded together with two sides of the butterfly-shaped flexible connection respectively, two naked battery cells are combined together to form a large battery cell, so that the thickness of a single battery cell can be increased, and the energy density of the single battery cell is improved.
However, the thicker the single bare cell is, the more challenging it is to weld the tab, and the number of layers for ultrasonic welding of the tab in the lithium battery industry is generally about 50 (aluminum foil or copper foil). If the number of the single naked battery cell layers is increased by more than 70, the problem of insufficient soldering or over-soldering can occur during welding. In order to make the single battery cell thicker and improve the energy density of the single battery cell, a new naked battery cell welding structure is necessary to be developed, ultrasonic welding of more than 70 layers of battery cell aluminum lugs or copper lugs is realized, and the problem of ultrasonic welding rosin joint of the ultra-thick lugs is solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a square power battery has solved the current problem to the ultrasonic bonding rosin joint of the super thick utmost point ear more than 70 layers.
The utility model is realized in such a way, a square power battery comprises a naked electric core, the naked electric core comprises a first naked electric core group and a second naked electric core group matched with the first naked electric core group, the first naked electric core group comprises a plurality of first naked electric cores, the second naked electric core group comprises a plurality of second naked electric cores,
the first bare cell comprises a first cathode sheet and a first anode sheet which is matched with the first cathode sheet and is separated by a diaphragm, the second bare cell comprises a second anode sheet and a second cathode sheet which is matched with the second anode sheet and is separated by the diaphragm,
the first cathode tab on the first cathode plate and the first cathode tab on the second cathode plate are arranged in a staggered manner, the first anode tab on the first anode plate and the second anode tab on the second anode plate are arranged in a staggered manner,
first positive pole utmost point ear with first negative pole utmost point ear is crisscross to be set up, just second positive pole utmost point ear with the crisscross setting of second negative pole utmost point ear, in the first naked electric core group first negative pole utmost point ear overlaps fixedly, just first positive pole utmost point ear overlaps fixedly, in the naked electric core group of second negative pole utmost point ear overlaps fixedly, just second positive pole utmost point ear overlaps fixedly, two utmost point ear between the naked electric core passes through the connection piece and connects.
First positive pole utmost point ear in the naked electric core first negative pole utmost point ear, second positive pole utmost point ear with second negative pole utmost point ear is in the coplanar and do not have the overlap section.
The utility model discloses a further technical scheme is: the cathode roll is die cut into first and second cathode sheets and the anode roll is cut into first and second anode sheets using conventional techniques. As shown in fig. 1.
The utility model discloses a further technical scheme is: the first cathode sheet, the first anode sheet and a diaphragm are laminated into a first naked battery cell through a lamination technology; and stacking a second cathode, a second anode sheet and a diaphragm into a second naked battery cell. As shown in fig. 2.
The utility model discloses a further technical scheme is: and the lug in the first bare cell group and the lug in the second bare cell group are arranged up and down.
The utility model discloses a further technical scheme is: connecting sheets are connected between the first anode tabs, between the second anode tabs and between the first anode tabs and the second anode tabs of the two bare cells; and all connect through the connection piece between the first negative pole utmost point ear of two naked electric cores, between the second negative pole utmost point ear and between first negative pole utmost point ear and the second negative pole utmost point ear.
The utility model discloses a further technical scheme is: pre-welding a plurality of layers of first anode tabs of the first bare cell group together and pre-welding a plurality of layers of first cathode tabs together by an ultrasonic welding technology; and similarly, the second anode tabs of the second bare cell group are pre-welded together, and the second cathode tabs of the second bare cell group are pre-welded together. The first bare cell group presses a first anode tab and a first cathode tab at the lowest layer position, and the second bare cell group presses a second anode tab and a second cathode tab at the highest layer position. Make things convenient for first naked electric core group and the naked electric core group of second to connect from top to bottom, the utmost point ear connection convenience this moment. As shown in fig. 3.
The utility model discloses a further technical scheme is: first positive pole utmost point ear with second positive pole utmost point ear is adjacent in the naked electric core, just first negative pole utmost point ear with second negative pole utmost point ear is adjacent.
The utility model discloses a further technical scheme is: after the prewelding is finished, the first naked electric core group and the second naked electric core group are overlapped together, and the pairing is called to form a naked electric core. In this state, the first anode tab is adjacent to the second anode tab, and the first cathode tab is adjacent to the second cathode tab. As shown in fig. 4.
The utility model discloses a further technical scheme is: the connection piece includes aluminium flexible coupling piece and copper flexible coupling piece, and first negative pole utmost point ear and second negative pole utmost point ear between two naked electric cores pass through the aluminium flexible coupling piece is connected, and first positive pole utmost point ear and second positive pole utmost point ear between two naked electric cores pass through the copper flexible coupling piece is connected.
The utility model discloses a further technical scheme is: the square power battery further comprises a protection plate and a top cover, wherein the protection plate is arranged on the lug, and the connection plates are connected through the top cover.
The utility model discloses a further technical scheme is: the aluminum flexible connecting sheet and the copper flexible connecting sheet are connected through the top cover.
The utility model discloses a further technical scheme is: the screening sheet includes aluminium screening sheet and copper screening sheet, the aluminium screening sheet is arranged in on first cathode tab and the second cathode tab, the copper screening sheet is arranged in on first anode tab and the second anode tab.
The utility model discloses a further technical scheme is: the two pairs of paired first bare cell groups and second bare cell groups are welded together with the aluminum flexible connecting sheet and the copper flexible connecting sheet through ultrasonic waves, and an aluminum protection sheet and a copper protection sheet can be covered on the lug during welding to prevent the lug from being damaged during welding. As shown in fig. 5, the illustration is the welding of the copper flexible connecting sheet, the copper flexible connecting sheet is at the lowest layer, the first anode tab of the first bare cell group and the second anode tab of the second bare cell group are in the middle, and the copper protective sheet is at the uppermost layer; the welding structure for welding the aluminum flexible connecting sheet is similar and is not described in detail.
The utility model discloses a further technical scheme is: after the soft connecting pieces are welded on the pair of bare cells, the bare cells are welded with the pole on the top cover through the aluminum soft connecting pieces and the copper soft connecting pieces together through laser.
The utility model discloses a further technical scheme is: after the aluminum soft connecting sheet, the copper soft connecting sheet and the top cover are welded, the pair of naked battery cores are stacked and folded together according to a conventional mode, bound, glued, wrapped with mylar, filled into a shell, sealed and welded, injected with liquid and welded with sealing nails, and then the battery core assembling process is completed.
The utility model has the advantages that: the utility model discloses in first naked electric core group and the cooperation of second naked electric core group form naked electric core after, wherein do not have overlap portion and be in the coplanar between first negative pole utmost point ear, first positive pole utmost point ear, second negative pole utmost point ear and the second positive pole utmost point ear, for current utmost point ear welding, the utmost point ear welding of the same thickness, because first negative pole utmost point ear and second negative pole utmost point ear on the negative pole piece are crisscross, and first positive pole utmost point ear and second positive pole utmost point ear on the positive pole piece are crisscross, great reduction welding process appear the problem of rosin joint and overwelding;
the utility model discloses the welding is more reliable, under the condition of guaranteeing naked electric core utmost point ear of ultrasonic welding and flexible coupling piece reliability, realizes multilayer utmost point ear welding, like electric core aluminium utmost point ear or copper lug ultrasonic welding more than 70 layers, solves super thick utmost point ear ultrasonic welding rosin joint problem.
Drawings
Fig. 1 is a schematic structural diagram of a cathode sheet and an anode sheet provided by the present invention;
wherein 1a in fig. 1 is a first cathode sheet, 1b is a second cathode sheet, 1c is a first anode sheet, and 1d is a second anode sheet;
fig. 2 is a schematic structural diagram of a first bare cell and a second bare cell provided by the present invention;
wherein 2a in fig. 2 is a first bare cell, 2b is a second bare cell;
fig. 3 is a side view (anode is an example) of the bare cell provided by the present invention before pre-welding;
fig. 4 is a plan view of the bare cell provided by the present invention after pre-welding;
fig. 5 is a schematic structural diagram of the two bare cells provided by the present invention after being matched;
fig. 6 is an enlarged view of the fit connection between two bare cells provided by the present invention;
fig. 7 is the utility model provides a two naked electric cores and top cap assembly structure sketch views.
Reference numerals: 1. a first cathode sheet, 2, a second cathode sheet, 3, a first anode sheet, 4, a second anode sheet, 5, a first bare cell, 51, a first anode tab, 52, a first cathode tab, 6, a second bare cell, 61, a second anode tab, 62, a second cathode tab, 7, an aluminum soft connecting sheet, 8, a copper soft connecting sheet, 9, an aluminum protective sheet, 10, a copper protective sheet and 11, a top cover.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
It should be noted that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
The first embodiment is as follows:
figures 1-7 show a square power cell comprising a bare cell comprising a first bare cell group comprising a number of first bare cells 5 and a second bare cell group cooperating with the first bare cell group comprising a number of second bare cells 6,
the first bare cell 5 comprises a first cathode sheet 1 and a first anode sheet 3 which is matched with the first cathode sheet and is separated by a diaphragm, the second bare cell 6 comprises a second anode sheet 4 and a second cathode sheet 2 which is matched with the second anode sheet 4 and is separated by a diaphragm,
the first cathode tab 52 on the first cathode sheet 1 and the first cathode tab 62 on the second cathode sheet 2 are arranged in a staggered manner, the first anode tab 51 on the first anode sheet 3 and the second anode tab 61 on the second anode sheet 4 are arranged in a staggered manner,
first positive pole utmost point ear 51 with first negative pole utmost point ear 52 sets up in crisscross, just second positive pole utmost point ear 61 with second negative pole utmost point ear 62 sets up in crisscross, in the first naked electric core group first negative pole utmost point ear 52 overlaps fixedly, just first positive pole utmost point ear 51 overlaps fixedly, in the second naked electric core group second negative pole utmost point ear 62 overlaps fixedly, just second positive pole utmost point ear 61 overlaps fixedly, two utmost point ear between the naked electric core passes through the connection piece and connects.
There is not the overlap portion in first anode tab 51, first cathode tab 52, second anode tab 61 in the naked electric core with second cathode tab 62.
In this embodiment, the cathode roll is die cut into the first cathode sheet 1 and the second cathode sheet 2, as shown at 1a and 1b in fig. 1, using conventional techniques; the anode coil is cut into a first anode sheet 3 and a second anode sheet 4 as shown in fig. 1 at 1c and 1 d.
In this embodiment, a first cathode sheet and a first anode sheet plus a separator (not shown) are stacked into a first bare cell by a lamination technique; a second cathode and a second anode sheet plus a separator (not shown) are stacked into a second bare cell. As shown in fig. 2.
In this embodiment, the tab of the first bare cell group and the tab of the second bare cell group are disposed up and down. .
In this embodiment, the first anode tabs 51, the second anode tabs 61, and the first anode tabs 51 and the second anode tabs 61 of the two bare cells are connected by connecting sheets; and the first cathode tabs 52 of the two bare cells, the second cathode tabs 62 and the first cathode tabs 52 and the second cathode tabs 62 are connected through connecting pieces.
In the present embodiment, the multiple layers of the first anode tabs 51 of the first bare cell group are pre-welded together and the multiple layers of the first cathode tabs 52 are also pre-welded together by an ultrasonic welding technique; the same applies to the multilayer second anode tab 61 of the second bare cell group, and the multilayer second cathode tab 62. The first bare cell group presses a first anode tab 51 and a first cathode tab 52 (not shown) at the lowermost position, and the second bare cell group presses a second anode tab 61 and a second cathode tab 62 (not shown) at the uppermost position. Make things convenient for first naked electric core group and the naked electric core group of second to connect from top to bottom, the utmost point ear connection convenience this moment. As shown in fig. 3.
In this embodiment, the first anode tab 51 is adjacent to the second anode tab 61 in the bare cell, and the first cathode tab 52 is adjacent to the second cathode tab 62.
In this embodiment, after the prewelding is finished, the first bare cell group and the second bare cell group are overlapped together, and the pairing is called to form a bare cell. In this state, the first anode tab 51 is adjacent to the second anode tab 61, and the first cathode tab 52 is adjacent to the second cathode tab 62. As shown in fig. 4.
In this embodiment, the connection piece includes soft connection piece 7 of aluminium and soft connection piece 8 of copper, and first negative pole utmost point ear 52 and second negative pole utmost point ear 62 between two naked electric cores pass through soft connection piece 7 of aluminium connects, and first positive pole utmost point ear 51 and second positive pole utmost point ear 61 between two naked electric cores pass through soft connection piece 8 of copper connects.
In this embodiment, the square power battery further comprises a protection sheet and a top cover 11, wherein the protection sheet is placed on the tabs, and the connection sheets are connected through the top cover 11.
In the embodiment, the aluminum flexible connecting sheet 7 and the copper flexible connecting sheet 8 are connected through the top cover 11.
In the present embodiment, the protective sheets include an aluminum protective sheet 9 and a copper protective sheet 10, the aluminum protective sheet 9 is placed on the first and second cathode tabs 52 and 62, and the copper protective sheet 10 is placed on the first and second anode tabs 51 and 61.
In this embodiment, two pairs of paired first and second bare cell groups are welded together with the flexible aluminum connecting sheet 7 and the flexible copper connecting sheet 8 by ultrasonic welding, and an aluminum protection sheet 9 and a copper protection sheet 10 are covered on the tab during welding to prevent the tab from being damaged during welding. As shown in fig. 5, the copper flexible connecting sheet 8 is welded as an example, the copper flexible connecting sheet 8 is at the lowest layer, the first anode tab 51 of the first bare cell group and the second anode tab 61 of the second bare cell group are in the middle, and the copper protective sheet 10 is at the uppermost layer; the welding structure for welding the aluminum soft connecting sheet 7 is similar and will not be described in detail.
In this embodiment, after the soft connection pieces are welded to the pair of bare cells, the bare cells are welded to the terminal posts (not shown) on the top cover 11 through the aluminum soft connection pieces 7 and the copper soft connection pieces 8 by laser.
In this embodiment, after the aluminum flexible connecting sheet 7 and the copper flexible connecting sheet 8 are welded to the top cover 11, the pair of bare cells are stacked and folded together in a conventional manner, and then are bound, glued, wrapped with mylar film, put into a casing, sealed and welded, injected with liquid, and welded with sealing nails, so as to complete the cell assembling process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (8)
1. The utility model provides a square power battery, includes naked electric core, its characterized in that: the naked electric core comprises a first naked electric core group and a second naked electric core group matched with the first naked electric core group, the first naked electric core group comprises a plurality of first naked electric cores (5), the second naked electric core group comprises a plurality of second naked electric cores (6),
the first naked battery cell (5) comprises a first cathode sheet (1) and a first anode sheet (3) which is matched with the first cathode sheet and is separated by a diaphragm, the second naked battery cell (6) comprises a second anode sheet (4) and a second cathode sheet (2) which is matched with the second anode sheet (4) and is separated by a diaphragm,
first negative pole utmost point ear (52) on first negative pole piece (1) with second negative pole utmost point ear (62) on second negative pole piece (2) stagger the setting, first positive pole utmost point ear (51) on first positive pole piece (3) with second positive pole utmost point ear (61) on second positive pole piece (4) stagger the setting, first positive pole utmost point ear (51) with first negative pole utmost point ear (52) set up in the crisscross, just second positive pole utmost point ear (61) with second negative pole utmost point ear (62) set up in the crisscross, in the first bare cell group first negative pole utmost point ear (52) overlap fixedly, just first positive pole utmost point ear (51) overlap fixedly, in the second bare cell group second negative pole utmost point ear (62) overlap fixedly, just second positive pole utmost point ear (61) overlap fixedly, two utmost point ear between the bare cell is through connecting the connection.
2. The square power battery according to claim 1, wherein the tabs of the first bare cell group are disposed above and below the tabs of the second bare cell group.
3. The square power battery according to claim 1, wherein the first anode tabs (51) of the two bare cells, the second anode tabs (61) of the two bare cells and the first anode tabs (51) and the second anode tabs (61) of the two bare cells are connected through connecting sheets; and the first cathode tabs (52) of the two naked battery cells, the second cathode tabs (62) and the first cathode tabs (52) and the second cathode tabs (62) are connected through connecting pieces.
4. The square-shaped power battery according to claim 1, wherein the bare cell has a first anode tab (51) adjacent to the second anode tab (61), and the first cathode tab (52) adjacent to the second cathode tab (62).
5. The square power battery according to claim 1, wherein the connecting sheet comprises an aluminum soft connecting sheet (7) and a copper soft connecting sheet (8), a first cathode tab (52) and a second cathode tab (62) between two bare cells are connected through the aluminum soft connecting sheet (7), and a first anode tab (51) and a second anode tab (61) between two bare cells are connected through the copper soft connecting sheet (8).
6. A square power battery according to claim 5, characterized in that the square power battery further comprises a protective sheet and a top cover (11), wherein the protective sheet is placed on the tabs, and the connecting sheets are connected with each other through the top cover (11).
7. A square power battery according to claim 6, characterized in that the aluminum flexible connecting sheet (7) and the copper flexible connecting sheet (8) are connected through the top cover (11).
8. A square power cell according to claim 6, characterized in that the protective sheets comprise an aluminum protective sheet (9) and a copper protective sheet (10), the aluminum protective sheet (9) being placed on the first cathode tab (52) and the second cathode tab (62), the copper protective sheet (10) being placed on the first anode tab (51) and the second anode tab (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221934853.9U CN218069953U (en) | 2022-07-26 | 2022-07-26 | Square power battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221934853.9U CN218069953U (en) | 2022-07-26 | 2022-07-26 | Square power battery |
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| CN218069953U true CN218069953U (en) | 2022-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221934853.9U Active CN218069953U (en) | 2022-07-26 | 2022-07-26 | Square power battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117936875A (en) * | 2024-03-14 | 2024-04-26 | 宁德时代新能源科技股份有限公司 | Pairing device and pairing method |
-
2022
- 2022-07-26 CN CN202221934853.9U patent/CN218069953U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117936875A (en) * | 2024-03-14 | 2024-04-26 | 宁德时代新能源科技股份有限公司 | Pairing device and pairing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230428 Address after: No. 46, Qingfu Anshijia, Guoxiangqiao Village, Lanjiang Street, Yuyao City, Ningbo City, Zhejiang Province, 315402 Patentee after: Yuyao Haitai Trading Co.,Ltd. Address before: No.78 Benzi West Road, Jiuhua demonstration zone, Xiangtan City, Hunan Province Patentee before: SOUNDON NEW ENERGY TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CU01 | Correction of utility model |
Correction item: Patentee|Address Correct: SOUNDON NEW ENERGY TECHNOLOGY Co.,Ltd.|No.78 Benzi West Road, Jiuhua demonstration zone, Xiangtan City, Hunan Province False: Yuyao Haitai Trading Co.,Ltd.|No. 46, Qingfu Anshijia, Guoxiangqiao Village, Lanjiang Street, Yuyao City, Ningbo City, Zhejiang Province, 315402 Number: 19-02 Volume: 39 |
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| CU01 | Correction of utility model | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20230426 Granted publication date: 20221216 |
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| PP01 | Preservation of patent right |