CN210576184U - Lithium ion battery - Google Patents

Lithium ion battery Download PDF

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Publication number
CN210576184U
CN210576184U CN201921862510.4U CN201921862510U CN210576184U CN 210576184 U CN210576184 U CN 210576184U CN 201921862510 U CN201921862510 U CN 201921862510U CN 210576184 U CN210576184 U CN 210576184U
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Prior art keywords
end side
positive
negative
negative pole
lithium ion
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CN201921862510.4U
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Inventor
黄志刚
张海林
孔少锋
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Evergrande New Energy Technology Shenzhen Co Ltd
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Evergrande New Energy Technology Shenzhen Co Ltd
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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
    • 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

Abstract

The utility model relates to an energy memory technical field provides a lithium ion battery, including two at least positive pole pieces and two at least negative pole pieces, each positive pole piece and each negative pole piece from top to bottom are range upon range of in turn. Each positive pole piece all has anodal first end side and anodal second end side, and anodal first end side of each positive pole piece is equipped with two at least first positive pole utmost point ears, and anodal second end side of each positive pole piece is equipped with two at least second positive pole utmost point ears, and each negative pole piece all has negative pole first end side and negative pole second end side, and the first end side of negative pole of each negative pole piece is equipped with two at least first negative pole utmost point ears, and the negative pole second end side of each negative pole piece is equipped with two at least second negative pole utmost point ears. In the charging and discharging process, current can flow into or flow out of the corresponding positive pole piece and negative pole piece through each positive pole lug and each negative pole lug, so that the problem of uneven distribution of current density of the pole pieces is effectively solved.

Description

Lithium ion battery
Technical Field
The utility model relates to an energy memory technical field especially provides a lithium ion battery.
Background
The lithium ion battery has the characteristics of high output voltage, high specific energy, stable discharge voltage and long cycle life. Lithium ion batteries have been widely used in the fields of notebook computers, digital cameras, and mobile phones.
With the continuous expansion of new energy markets, the requirement of customers on endurance mileage is higher and higher, the requirement on charging time is shorter and shorter, and particularly, the power lithium ion battery for the vehicle needs to meet the requirement on high energy density and also needs to have high power density. In order to meet the market demand, the high-rate charge and discharge performance of the lithium ion battery is very important.
Traditional lithium ion battery adopts single utmost point ear mostly, anodal pole piece corresponds an anodal utmost point ear promptly, negative pole piece corresponds a negative pole utmost point ear, like this, lithium ion battery's structure is hardly compromise high power density when satisfying the high energy density requirement, lead to lithium ion battery at big multiplying power charge-discharge in-process, especially in the charging process, and charge under the low temperature environment and arouse the pole piece current density uneven distribution, cause local lithium of analysing that local overcharge and insufficient charge arouse, black spot, low capacity, poor scheduling problem of cycle life, the improvement lithium ion battery's that can show simultaneously power density.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lithium ion battery aims at solving current lithium ion battery and because of adopting the uneven distribution of pole piece current density among the charge-discharge process that single utmost point ear leads to, and then arouses the problem that reduces lithium ion battery power density such as local lithium of analyzing.
In order to achieve the above object, the utility model adopts the following technical scheme: a lithium ion battery comprises at least two positive pole pieces and at least two negative pole pieces, wherein each positive pole piece and each negative pole piece are alternately stacked from top to bottom, each positive pole piece is provided with a positive first end side and a positive second end side, the positive first end side of each positive pole piece is provided with at least two first positive pole lugs, the positive second end side of each positive pole piece is provided with at least two second positive pole lugs, each negative pole piece is provided with a negative first end side and a negative second end side, the negative first end side of each negative pole piece is provided with at least two first negative pole lugs, and the negative second end side of each negative pole piece is provided with at least two second negative pole lugs.
By adopting the technical scheme, the number of the positive pole lugs is increased on the first end side and the second end side of the positive pole piece, and the number of the negative pole lugs is increased on the first end side and the second end side of the negative pole piece, so that in the charging and discharging process, current can flow into or out of the corresponding positive pole piece and negative pole piece through each positive pole lug and each negative pole lug, the problem of uneven distribution of current density of the pole pieces is effectively avoided, and the problems of lithium ion battery lithium precipitation, black spots, low charging speed, low capacity, poor circulation and the like caused by overlarge direct current internal resistance are solved.
In one embodiment, the positive electrode first end side is adjacent to or opposite to the positive electrode second end side.
In one embodiment, each of the positive electrode plates has a positive electrode third end side, and at least two third positive electrode tabs are disposed on the positive electrode third end side of each of the positive electrode plates.
By adopting the technical scheme, the number of the positive pole lugs of the positive pole piece is further increased, and the current sealing uniformity distribution of the positive pole piece is further improved.
In one embodiment, each of the positive electrode plates has a positive electrode fourth end side, and the positive electrode fourth end side of each of the positive electrode plates is provided with at least two fourth positive electrode tabs.
By adopting the technical scheme, the number of the positive pole lugs of the positive pole piece is further increased, and the current sealing uniformity distribution of the positive pole piece is improved again.
In one embodiment, the negative electrode first end side is adjacent to or opposite to the negative electrode second end side.
In one embodiment, each of the negative electrode plates has a negative third end side, and the negative third end side of each of the negative electrode plates is provided with at least two third negative electrode tabs.
By adopting the technical scheme, the number of the negative pole lugs of the negative pole piece is further increased, and the current sealing uniformity distribution of the negative pole piece is further improved.
In one embodiment, each of the negative electrode plates has a negative fourth end side, and the negative fourth end side of each of the negative electrode plates is provided with at least two fourth negative electrode tabs.
By adopting the technical scheme, the number of the positive pole lugs of the positive pole piece is further increased, and the current sealing uniformity distribution of the positive pole piece is improved again.
In one embodiment, the lithium ion battery further comprises a separator for separating each positive electrode plate and each negative electrode plate.
By adopting the technical scheme, the positive pole pieces and the negative pole pieces are sequentially separated and separated by the isolating film.
In one embodiment, the lithium ion battery further comprises a positive electrode baffle for connecting each first positive electrode tab and each second positive electrode tab; the positive flow deflector is used for connecting each first positive electrode lug, each second positive electrode lug and each third positive electrode lug; the positive flow deflector is used for connecting each first positive pole lug, each second positive pole lug, each third positive pole lug and each fourth positive pole lug.
By adopting the technical scheme, the positive pole guide pieces are utilized to connect the positive pole lugs of the positive pole pieces to form a total positive pole, so that the concentrated charging and discharging of the positive pole pieces are realized.
In one embodiment, the lithium ion battery further comprises a negative electrode current guiding sheet for connecting each of the first negative electrode tabs and each of the second negative electrode tabs; the negative pole flow deflector is used for connecting each first negative pole lug, each second negative pole lug and each third negative pole lug; the negative pole guide piece is used for connecting each first negative pole lug, each second negative pole lug, each third negative pole lug and each fourth negative pole lug.
By adopting the technical scheme, the negative pole guide pieces are utilized to connect the negative pole lugs of the negative and positive pole pieces to form the total negative pole, so that the concentrated charging and discharging of the negative pole pieces are realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a top view of a positive electrode plate of a lithium ion battery according to an embodiment of the present invention;
fig. 2 is another top view of the positive electrode plate of the lithium ion battery according to the first embodiment of the present invention;
fig. 3 is a top view of a negative electrode plate of a lithium ion battery according to an embodiment of the present invention;
fig. 4 is another top view of a negative electrode plate of a lithium ion battery according to an embodiment of the present invention;
fig. 5 is a top view of a stacked positive electrode plate and a stacked negative electrode plate of a lithium ion battery according to an embodiment of the present invention;
fig. 6 is another plan view of the lithium ion battery according to the first embodiment of the present invention after stacking the positive electrode plate and the negative electrode plate;
fig. 7 is a cross-sectional view of a lithium ion battery according to a first embodiment of the present invention;
fig. 8 is a top view of a lithium ion battery according to an embodiment of the present invention;
fig. 9 is a top view of a positive electrode plate of a lithium ion battery provided in the second embodiment of the present invention;
fig. 10 is a top view of a negative electrode plate of a lithium ion battery provided in the second embodiment of the present invention;
fig. 11 is a top view of a lithium ion battery provided in the second embodiment of the present invention;
fig. 12 is a top view of a positive electrode plate of a lithium ion battery provided in the third embodiment of the present invention;
fig. 13 is a top view of a negative electrode plate of a lithium ion battery provided in the third embodiment of the present invention;
fig. 14 is a cross-sectional view of a lithium ion battery provided in the third embodiment of the present invention;
fig. 15 is a top view of a lithium ion battery provided in the third embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
the negative electrode comprises a positive electrode piece 10, a negative electrode piece 20, a positive electrode first end side 10a, a positive electrode second end side 10b, a positive electrode third end side 10c, a positive electrode fourth end side 10d, a first positive electrode tab 11, a second positive electrode tab 12, a third positive electrode tab 13, a fourth positive electrode tab 14, a negative electrode first end side 20a, a negative electrode second end side 20b, a negative electrode third end side 20c, a negative electrode fourth end side 20d, a first negative electrode tab 21, a second negative electrode tab 22, a third negative electrode tab 23, a fourth negative electrode tab 24, an isolating film 30, an accommodating cavity 30a, a positive electrode guide sheet 41 and a negative electrode guide sheet 42.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
Referring to fig. 1 to 4, a lithium ion battery provided by an embodiment of the present invention includes at least two positive electrode plates 10 and at least two negative electrode plates 20, and each positive electrode plate 10 and each negative electrode plate 20 are stacked from top to bottom alternately. Each positive electrode piece 10 has a positive electrode first end side 10a and a positive electrode second end side 10b, the positive electrode first end side 10a of each positive electrode piece 10 is provided with at least two first positive electrode tabs 11, the positive electrode second end side 10b of each positive electrode piece 10 is provided with at least two second positive electrode tabs 12, each negative electrode piece 20 has a negative electrode first end side 20a and a negative electrode second end side 20b, the negative electrode first end side 20a of each negative electrode piece 20 is provided with at least two first negative electrode tabs 11, and the negative electrode second end side 20b of each negative electrode piece 20 is provided with at least two second negative electrode tabs 12.
The embodiment of the utility model provides a lithium ion battery, through the positive pole first end side 10a and the positive pole second end side 10b to positive pole piece 10 increase the quantity of anodal utmost point ear, and to the negative pole first end side 20a and the negative pole second end side 20b of negative pole piece 20 increase the quantity of negative pole utmost point ear, and thus, in the charge-discharge process, each anodal utmost point ear of electric current accessible and each negative pole utmost point ear flow in or flow out the anodal pole piece 10 and the negative pole piece 20 that correspond, thereby avoided pole piece current density distribution uneven problem effectively, and then also solved the too big lithium ion battery that arouses of direct current internal resistance and educed the lithium, the black spot, charge speed is slow, low capacity, poor scheduling problem circulates.
The first positive electrode tab and the second positive electrode tab have the same structure and function, and are different only in the mounting position, and therefore, the first positive electrode tab and the second positive electrode tab are distinguished by "first" and "second", and the third positive electrode tab and the fourth positive electrode tab, which will be described later, are also explained above. It is to be understood that the antecedents "first", "second", "third" and "fourth" of the negative electrode tab are also explained above.
In one embodiment, as shown in fig. 1, the positive electrode first end side 10a is disposed adjacent to the positive electrode second end side 10b, i.e., the positive electrode first end side 10a is perpendicularly connected to the positive electrode second end side 10 b. As shown in fig. 2, the positive electrode first end side 10a is disposed opposite to the positive electrode second end side 10b, i.e., parallel to each other.
In one embodiment, as shown in fig. 3, the negative first end side 20a is disposed adjacent to the negative second end side 20b, i.e., perpendicular to each other. Similarly, as shown in fig. 4, the negative electrode first end side 20a is disposed opposite to the negative electrode second end side 20b, i.e., parallel to each other.
When the positive electrode first end side 10a of the positive electrode plate 10 is adjacent to the positive electrode second end side 10b, and simultaneously, when the negative electrode first end side 20a of the negative electrode plate 20 is adjacent to the negative electrode second end side 20b, as shown in fig. 5, in the vertical direction, each positive electrode tab and each negative electrode tab are distributed in a staggered manner, that is, a set of adjacent side surfaces of the lithium ion battery are positive electrode tabs, and another set of adjacent side surfaces are negative electrode tabs. Alternatively, when the positive electrode first end side 10a of the positive electrode tab 10 is disposed opposite to the positive electrode second end side 10b, and the negative electrode first end side 20a of the negative electrode tab 20 is disposed opposite to the negative electrode second end side 20b, as shown in fig. 6, each positive electrode tab and each negative electrode tab are spaced apart from each other in the vertical direction. Similarly, the same requirement is met for the connection and the collection of each positive electrode tab and each negative electrode tab, and the connection mode is different only.
In one embodiment, the lithium ion battery further includes a separator 30, and the separator 30 is used to separate each positive electrode tab 10 from each negative electrode tab 20. Specifically, as shown in fig. 5 and 7, the separator 30 is bent in the stacking direction to form a plurality of receiving cavities 30a, and each positive electrode plate 10 and each negative electrode plate 20 are alternately inserted into the corresponding receiving cavity 30a from top to bottom, and it can be understood that each receiving cavity 30a is an open cavity with one end sealed and the other three ends open, so that it is just suitable for exposing the positive electrode first end side 10a and the positive electrode second end side 10b having the positive electrode plate 10 at the corresponding openings, respectively, and exposing the negative electrode first end side 20a and the negative electrode second end side 20b having the negative electrode plate 20 at the corresponding openings, respectively.
In one embodiment, the lithium ion battery further includes a positive electrode current guiding sheet 41, and the positive electrode current guiding sheet 41 is used for connecting each first positive electrode tab 11 and each second positive electrode tab 12. Specifically, as shown in fig. 8, when the positive electrode first end side 10a and the positive electrode second end side 10b of the positive electrode tab 10 are disposed adjacent to each other, the positive electrode current guide 41 is L-shaped.
In one embodiment, the lithium ion battery further includes a negative electrode current guide 42, and the negative electrode current guide 42 is used for connecting each first negative electrode tab 11 and each second negative electrode tab 12. Specifically, as shown in fig. 8, when the negative first end side 20a and the negative second end side 20b of the negative pole piece 20 are disposed adjacent to each other, the negative current guide 42 is L-shaped.
Example two
The difference from the above embodiment is that, referring to fig. 9, each positive electrode tab 10 further has a positive electrode third end side 10c, and at least two third positive electrode tabs 13 are disposed on the positive electrode third end side 10c of each positive electrode tab 10. It can be understood that three end sides of each positive pole piece 10 are provided with positive pole tabs, so that the uniformity of the current density distribution of the pole pieces in the charging and discharging process of the lithium ion battery is further improved, and the use safety of the lithium ion battery is improved.
Similarly, referring to fig. 10, each negative electrode tab 20 has a negative third end side 20c, and at least two third negative electrode tabs 23 are disposed on the negative third end side 20c of each negative electrode tab 20. Thus, each negative electrode tab 20 has a negative electrode tab on each of the three end sides.
In one embodiment, referring to fig. 11, the positive electrode tabs 10 and the negative electrode tabs 20 are stacked alternately from top to bottom, and the positive electrode first end side 10a is opposite to the negative electrode first end side 20a, the positive electrode second end side 10b is the same side as the negative electrode third end side 20c, and the positive electrode third end side 10c is the same side as the negative electrode second end side 20b, so that the positive electrode deflector 41 is U-shaped when the positive electrode tabs at the three end sides are connected by the positive electrode deflector 41. Similarly, when the negative electrode tabs on the three end sides are connected by the negative electrode flow deflectors 42, the negative electrode flow deflectors 42 are U-shaped.
EXAMPLE III
Referring to fig. 12, in the second embodiment, each positive electrode piece 10 has a positive electrode fourth end side 10d, and the positive electrode fourth end side 10d of each positive electrode piece 10 is provided with at least two fourth positive electrode tabs 14. It can be understood that four end sides of each positive pole piece 10 are provided with positive pole tabs, so that the uniformity of the current density distribution of the pole pieces in the charging and discharging process of the lithium ion battery is further improved, and the use safety of the lithium ion battery is improved.
Similarly, referring to fig. 13, each negative electrode tab 20 has a negative fourth end 20d, and the negative fourth end 20d of each negative electrode tab 20 is provided with at least two fourth negative electrode tabs 24. In this way, each negative electrode tab 20 has a negative electrode tab on each of the four end sides.
In one embodiment, referring to fig. 14, when the four end sides of each positive electrode plate 10 are provided with positive electrode tabs and the four end sides of each negative electrode plate are provided with negative electrode tabs, the separator 30 is required to wrap six faces of each positive electrode plate 10 and six faces of each negative electrode plate 20, and then, the positive electrode plates and the negative electrode plates are stacked alternately from top to bottom.
In one embodiment, referring to fig. 15, the positive electrode plates 10 and the negative electrode plates 20 are stacked alternately from top to bottom, at this time, positive electrode tabs and negative electrode tabs are arranged at intervals on four side end faces of the lithium ion battery, at this time, the positive electrode baffle 41 is in a closed ring shape and is used for connecting the positive electrode tabs on each end side. Similarly, the negative current guiding plate 42 is in a closed ring shape and is used for connecting the negative electrode tabs on each end side.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A lithium ion battery, characterized by: the positive pole pieces and the negative pole pieces are alternately stacked from top to bottom, each positive pole piece is provided with a positive first end side and a positive second end side, the positive first end side of each positive pole piece is provided with at least two first positive pole lugs, the positive second end side of each positive pole piece is provided with at least two second positive pole lugs, each negative pole piece is provided with a negative first end side and a negative second end side, the negative first end side of each negative pole piece is provided with at least two first negative pole lugs, and the negative second end side of each negative pole piece is provided with at least two second negative pole lugs.
2. The lithium ion battery of claim 1, wherein: the positive electrode first end side is disposed adjacent to or opposite the positive electrode second end side.
3. The lithium ion battery of claim 1, wherein: each positive pole piece is provided with a positive third end side, and the positive third end side of each positive pole piece is provided with at least two third positive pole lugs.
4. The lithium ion battery of claim 3, wherein: each positive pole piece is provided with a positive fourth end side, and the positive fourth end side of each positive pole piece is provided with at least two fourth positive pole lugs.
5. The lithium ion battery of claim 4, wherein: the lithium ion battery also comprises an anode flow deflector, and the anode flow deflector is used for connecting each first anode tab and each second anode tab; the positive flow deflector is used for connecting each first positive electrode lug, each second positive electrode lug and each third positive electrode lug; the positive flow deflector is used for connecting each first positive pole lug, each second positive pole lug, each third positive pole lug and each fourth positive pole lug.
6. The lithium ion battery of claim 1, wherein: the negative electrode first end side is adjacent to or opposite to the negative electrode second end side.
7. The lithium ion battery of claim 1, wherein: each negative pole piece is provided with a negative third end side, and at least two third negative pole lugs are arranged on the negative third end side of each negative pole piece.
8. The lithium ion battery of claim 7, wherein: each negative pole piece is provided with a negative fourth end side, and the negative fourth end side of each negative pole piece is provided with at least two fourth negative pole lugs.
9. The lithium ion battery of claim 8, wherein: the lithium ion battery also comprises a negative pole flow deflector, and the negative pole flow deflector is used for connecting each first negative pole lug and each second negative pole lug; the negative pole flow deflector is used for connecting each first negative pole lug, each second negative pole lug and each third negative pole lug; the negative pole guide piece is used for connecting each first negative pole lug, each second negative pole lug, each third negative pole lug and each fourth negative pole lug.
10. The lithium ion battery of any of claims 1 to 9, wherein: the lithium ion battery also comprises an isolating film used for isolating each positive pole piece and each negative pole piece.
CN201921862510.4U 2019-10-31 2019-10-31 Lithium ion battery Active CN210576184U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112802991A (en) * 2020-12-31 2021-05-14 联想(北京)有限公司 Battery structure, electronic device and charging method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112802991A (en) * 2020-12-31 2021-05-14 联想(北京)有限公司 Battery structure, electronic device and charging method

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