CN210744083U

CN210744083U - Cylindrical lithium battery and parallel winding core thereof

Info

Publication number: CN210744083U
Application number: CN201921997863.5U
Authority: CN
Inventors: 张凤玲; 赵悠曼
Original assignee: Dongguan Chuangming Battery Technology Co Ltd
Current assignee: Dongguan Chuangming Battery Technology Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-06-12
Anticipated expiration: 2029-11-18

Abstract

The utility model belongs to the technical field of lithium ion battery, especially, relate to a cylinder lithium cell and parallelly connected book core thereof. The cylindrical lithium battery parallel winding core comprises a winding core main body, wherein the winding core main body comprises an anode diaphragm provided with an anode tab and a cathode diaphragm provided with a cathode tab, a first winding end of the winding core main body winds towards the middle of the winding core main body to form a first winding body, a second winding end winds towards the middle of the winding core main body to form a second winding body, one part of the anode tab and one part of the cathode tab are positioned at the first winding body, the other part of the anode tab and the other part of the cathode tab are positioned at the second winding body, so that the first winding body and the second winding body are equivalent to two independent winding cores which are connected in parallel, the two independent winding cores can be coated in a battery shell as a whole, the parallel connection is realized in the battery shell, the space occupied by the battery shell after the parallel connection can be saved, and the; and the difference of the electrical property of the first winding body and the second winding body is small, and the rate capability of the battery is good.

Description

Cylindrical lithium battery and parallel winding core thereof

Technical Field

The utility model belongs to the technical field of lithium ion battery, especially, relate to a cylinder lithium cell and parallelly connected book core thereof.

Background

The cylindrical lithium ion battery is a type of lithium ion battery adopting a metal shell or an aluminum plastic film flexible package, has the characteristics of good safety performance and high energy density, and is a type of battery widely used in the market. The electric core of the existing cylindrical lithium battery mainly adopts a winding type structure, the preparation process of the winding type electric core is simple, the automatic production is convenient, and the finished product rate is high.

However, the winding type battery core is composed of a winding core, and when the batteries need to be connected in parallel, the winding type battery core can be generally realized only by a mode of welding the outer part of a finished product. So, because the performance uniformity between different batteries is relatively poor, the multiplying power and the cycle life that lead to the parallelly connected group battery that forms after the outside is parallelly connected are relatively poor to, outside welding is because parallelly connected battery case interval is great, and the battery compartment volume that occupies when parallelly connected group battery uses is great, can't satisfy the small bulky development demand of power consumption product.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cylinder lithium cell and parallelly connected book core thereof aims at solving prior art and adopts the parallelly connected battery of outside welding because the battery performance difference leads to multiplying power and circulation performance relatively poor greatly, and occupy the great technical problem of battery compartment volume after parallelly connected.

In order to achieve the above object, the utility model adopts the following technical scheme: a parallel-connection winding core of a cylindrical lithium battery comprises a winding core main body, wherein the winding core main body comprises a positive electrode diaphragm, a negative electrode diaphragm and an isolating film, the positive electrode diaphragm and the negative electrode diaphragm are arranged in a laminated mode, the isolating film is located between the positive electrode diaphragm and the negative electrode diaphragm, the parallel-connection winding core of the cylindrical lithium battery further comprises a plurality of positive electrode lugs and a plurality of negative electrode lugs, each positive electrode lug is arranged on the positive electrode diaphragm at intervals and is led out along the width direction, each negative electrode lug is arranged on the negative electrode diaphragm at intervals and is led out along the width direction, and the leading-out directions of the positive electrode lugs and the negative electrode;

roll up the core main part and be provided with relative first winding end and second winding end along length direction, first winding end court the middle part of rolling up the core main part is convoluteed and is formed first winding body, the second winding end court the middle part of rolling up the core main part is convoluteed and is formed with the second winding body that first winding body offsets, the diameter of first winding body equals the diameter of second winding body, partly anodal utmost point ear and some the negative pole utmost point ear is located first winding body, another part anodal utmost point ear and another part the negative pole utmost point ear is located the second winding body.

Further, the first winding end and the second winding end are wound towards the same side portion to form the first winding body and the second winding body which are arranged at the same side.

Further, the first winding end and the second winding end are wound towards opposite side portions to form the first winding body and the second winding body which are arranged on opposite sides.

Further, the diameter of the first winding body is equal to that of the second winding body, the positive electrode tabs are arranged on the positive electrode film at uniform intervals, the number of the positive electrode tabs of the first winding body is equal to that of the positive electrode tabs of the second winding body, the number of the negative electrode tabs of the first winding body is equal to that of the negative electrode tabs of the second winding body, the negative electrode tabs of the first winding body are arranged on the negative electrode film at uniform intervals, and the number of the negative electrode tabs of the first winding body is equal to that of the negative electrode tabs of the second winding body.

Furthermore, the parallelly connected book core of cylinder lithium cell includes two anodal utmost point ear and two negative pole utmost point ear, and two anodal utmost point ear is located respectively first winding body with second winding body department, two negative pole utmost point ear is located respectively first winding body with second winding body department.

Furthermore, the ends of the positive electrode tabs extending out of the first winding body and the second winding body are connected in a welding mode, and the ends of the negative electrode tabs extending out of the first winding body and the second winding body are connected in a welding mode.

Further, the positive diaphragm comprises an aluminum foil and a cathode coating layer coated on the aluminum foil, and the cathode coating layer avoids the positive electrode tabs.

Further, the negative diaphragm comprises a copper foil and an anode coating layer coated on the copper foil, and the anode coating layer avoids each negative electrode lug.

Further, the positive electrode lug is an aluminum lug, and the negative electrode lug is a nickel lug.

The utility model provides an above-mentioned one or more technical scheme in the parallelly connected book core of cylinder lithium cell have one of following technological effect at least: the winding core main body is wound by taking a first winding end as a starting end to form a first winding body, and wound by taking a second winding end as a starting end to form a second winding body which is abutted to the first winding body and has the same diameter. In this way, when the battery is used, the first winding body and the second winding body respectively use each positive electrode tab and each negative electrode tab inside the first winding body and the second winding body as an electron channel, and the first winding body and the second winding body can be equivalent to two independent winding core structures connected in parallel and can be wrapped in a battery shell as a whole. Therefore, two parallel winding core structures can be manufactured by using the same winding core main body, so that parallel connection is realized in the battery shell, and the two winding core structures (the first winding body and the second winding body) are in seamless butt joint, so that the space occupied by the battery shell after parallel connection can be saved, the volume occupied by the battery in a battery compartment is reduced, and the miniaturization design of an electronic product using parallel batteries is facilitated; and moreover, the first winding body and the second winding body are wound by using the same winding core main body, the performance difference between the first winding body and the second winding body which are connected in parallel is small, the rate capability of the battery is good, and the risk of circuit break caused by parallel connection of the external welding of the battery can be avoided.

The utility model discloses another technical scheme is: the utility model provides a cylinder lithium cell, includes the parallelly connected book core of foretell cylinder lithium cell.

The cylindrical lithium battery of the utility model, because the parallel winding core of the cylindrical lithium battery is used as the electric core, the parallel connection is realized in the battery shell, thereby saving the space occupied by the battery shell after parallel connection, reducing the volume of the battery occupied by the battery, and being beneficial to the miniaturization design of electronic products using parallel batteries; and, the parallelly connected book core of cylinder lithium cell uses the same book core main part to wind and makes, and the performance difference is less, and battery rate performance is better.

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 introduced 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 inventive labor.

Fig. 1 is a schematic structural diagram of an anode diaphragm of a parallel winding core of a cylindrical lithium battery provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a negative electrode diaphragm of a parallel winding core of a cylindrical lithium battery provided in an embodiment of the present invention;

fig. 3 is a schematic view of a winding manner of a parallel winding core of a cylindrical lithium battery provided in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a parallel winding core of a cylindrical lithium battery wound in the winding manner shown in FIG. 3;

FIG. 5 is a schematic cross-sectional view of a parallel winding core of the cylindrical lithium battery shown in FIG. 4;

fig. 6 is a schematic view of another winding manner of a parallel winding core of a cylindrical lithium battery according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a parallel winding core of a cylindrical lithium battery wound in the winding manner shown in FIG. 6;

fig. 8 is a schematic cross-sectional view of the parallel winding core of the cylindrical lithium battery shown in fig. 7.

Wherein, in the figures, the respective reference numerals:

10-positive diaphragm 11-positive pole tab connection area 12-aluminum foil

13-cathode coating layer 20-negative electrode diaphragm 21-negative electrode lug connection area

22-copper foil 23-anode coating layer 30-anode tab

40-negative pole tab 100-winding core main body 101-first winding end

102-second winding end 103-first winding 104-second winding.

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 fig. 1 to 8 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.

As shown in fig. 1-8, an embodiment of the utility model provides a parallelly connected book core of cylinder lithium cell, it includes a book core main part 100, rolls up positive diaphragm 10, negative pole diaphragm 20 that core main part 100 set up including the stromatolite and lies in positive diaphragm 10 and negative pole diaphragm 20 between the diaphragm (not shown), and the diaphragm is used for preventing positive diaphragm 10 and negative pole diaphragm 20 mutual contact and leads to the inside short circuit of battery.

Further, as shown in fig. 1 and fig. 2, the cylindrical lithium battery parallel winding core further includes a plurality of positive electrode tabs 30 and a plurality of negative electrode tabs 40, each positive electrode tab 30 is disposed on the positive electrode membrane 10 at an interval and is led out along the width direction, each negative electrode tab 40 is disposed on the negative electrode membrane 20 at an interval and is led out along the width direction, and the leading directions of the positive electrode tabs 30 and the negative electrode tabs 40 are opposite. Specifically, as shown in fig. 1 and 2, the positive membrane 10 is provided with a plurality of positive tab connection areas 11 at intervals in the width direction, the negative membrane 20 is provided with a plurality of negative tab connection areas 21 at intervals in the width direction, the positive tabs 30 are connected to the positive tab connection areas 11 one by one, and the negative tabs 40 are connected to the negative tab connection areas 21 one by one. Specifically, the one end of each positive electrode tab 30 all extends out positive pole diaphragm 10 in order to be used for with battery case's utmost point post welding, and the other end of each positive electrode tab 30 all is located positive electrode tab joining region 11, and the one end of each negative electrode tab 40 all extends negative pole diaphragm 20 in order to be used for with battery case's utmost point post welding towards the direction that deviates from positive electrode tab 30, and the other end of each negative electrode tab 40 all is located negative electrode tab joining region 21.

Further, as shown in fig. 3 to 8, the winding core main body 100 is provided with a first winding end 101 and a second winding end 102 opposite to each other in the longitudinal direction, the first winding end 101 is wound toward the middle of the winding core main body 100 to form a first winding body 103, the second winding end 102 is wound toward the middle of the winding core main body 100 to form a second winding body 104 abutting against the first winding body 103, a part of the positive electrode tab 30 and a part of the negative electrode tab 40 are located on the first winding body 103, and the other part of the positive electrode tab 30 and the other part of the negative electrode tab 40 are located on the second winding body 104. And one end of each positive electrode tab 30 is extended from one end of the first wound body 103 and the second wound body 104, respectively, and one end of each negative electrode tab 40 is extended from the other end of the first wound body 103 and the second wound body 104, respectively, as shown in fig. 4 and 7. In this way, the first wound body 103 generates current by using each of the cathode tabs 30 and each of the anode tabs 40 therein as an electron channel, and the second wound body 104 generates current by using each of the cathode tabs 30 and each of the other anode tabs 40 therein as an electron channel, that is, the first wound body 103 and the second wound body 104 independently generate current by using each of the cathode tabs 30 and each of the anode tabs 40 therein as an electron channel, and the first wound body 103 and the second wound body 104 may correspond to two independent winding core structures connected in parallel.

The utility model discloses parallelly connected book core of cylinder lithium cell sets up a plurality of positive pole utmost point ears 30 on positive diaphragm 10, sets up a plurality of negative pole utmost point ears 40 on the negative pole diaphragm 20 to will roll up a core main part 100 and use first winding end 101 to coil up and form first winding body 103, use second winding end 102 to coil up and form the second winding body 104 that equals with first winding body 103 butt and diameter as the starting end. In this way, when the first wound body 103 and the second wound body 104 generate current using the positive electrode tabs 30 and the negative electrode tabs 40 inside thereof as electron channels, respectively, the first wound body 103 and the second wound body 104 can be equivalent to two independent winding core structures connected in parallel, and can be covered in the battery case as a whole. Thus, two parallel winding core structures can be manufactured by using the same winding core main body 100, so that parallel connection is realized in the battery shell, and the two winding core structures (the first winding body 103 and the second winding body 104) are in seamless butt joint, so that the space occupied by the battery shell after parallel connection can be saved, the volume occupied by the battery is reduced, and the miniaturization design of an electronic product using the parallel batteries is facilitated; further, the first wound body 103 and the second wound body 104 having the same diameter are wound around the same winding core body 100, and the first wound body 103 and the second wound body 104 connected in parallel have a small difference in electrical properties, resulting in a good battery rate performance.

Specifically, in the present embodiment, as shown in fig. 3, the first winding end 101 and the second winding end 102 may be wound toward the same side (as indicated by arrows F1 and F2 in fig. 3) to form the first winding body 103 and the second winding body 104 disposed on the same side, as shown in fig. 4 and 5. Alternatively, as shown in fig. 6, the first winding end 101 and the second winding end 102 may be wound toward opposite sides (directions indicated by arrows F3 and F4 in fig. 6) to form the first winding body 103 and the second winding body 104 which are disposed at opposite sides, as shown in fig. 7 and 8. That is, the winding directions of the first winding end 101 and the second winding end 102 do not affect the performance of the first winding body 103 and the second winding body 104, the two winding forms can both be used for manufacturing the cylindrical lithium battery parallel winding core of the embodiment, the cylindrical lithium battery parallel winding core can be selected according to needs during use, and the manufacturing mode is more convenient and flexible.

In another embodiment of the present invention, as shown in fig. 5 and 8, the diameter of the first winding body 103 is equal to the diameter of the second winding body 104, so that the first winding body 103 and the second winding body 104 are wound by using the same winding core main body 100, and the performance difference between the first winding body 103 and the second winding body 104 connected in parallel can be further reduced, thereby better improving the multiplying power and the cycle performance of the battery.

Further, in the present embodiment, the positive electrode tabs 30 are uniformly arranged on the positive electrode film 10 at intervals, and the number of the positive electrode tabs 30 of the first winding body 103 is the same as that of the positive electrode tabs 30 of the second winding body 104, that is, a plurality of positive electrode tab connection areas 11 are uniformly arranged on the positive electrode film 10 at intervals to correspondingly connect the positive electrode tabs 30; the negative electrode tabs 40 are uniformly spaced on the negative electrode film 20, and the number of the negative electrode tabs 40 of the first winding body 103 is the same as that of the negative electrode tabs 40 of the second winding body 104, that is, a plurality of negative electrode tab connection regions 21 are uniformly spaced on the negative electrode film 20 to correspondingly connect the negative electrode tabs 40 (not shown). As described above, the number of the positive electrode tabs 30 and the number of the negative electrode tabs 40 of the first wound body 103 and the second wound body 104 are the same, and the number of the electron channels of the first wound body 103 and the second wound body 104 are the same, so that the difference in electrical performance between the first wound body 103 and the second wound body 104 can be further reduced, and the rate characteristics can be further improved. In addition, a plurality of positive electrode tabs 30 and a plurality of negative electrode tabs 40 are arranged in the first winding body 103 and the second winding body 104 and are simultaneously used as electronic channels, so that the internal resistance of the parallel winding core of the cylindrical lithium battery in the embodiment can be reduced, the current transmission speed is increased, and the requirement for manufacturing a power battery with strong conductivity can be met.

In another embodiment of the present invention, as shown in fig. 4 and 7, the cylindrical lithium battery parallel winding core includes two positive electrode tabs 30 and two negative electrode tabs 40, the two positive electrode tabs 30 are respectively located at the first winding body 103 and the second winding body 104, and the two negative electrode tabs 40 are respectively located at the first winding body 103 and the second winding body 104. Specifically, as shown in fig. 1 and fig. 2, the positive electrode film 10 is provided with a positive electrode tab connection area 11 at a position close to the first winding end 101 and a position close to the second winding end 102, the negative electrode film 20 is provided with a negative electrode tab connection area 21 at a position close to the first winding end 101 and a position close to the second winding end 102, the two positive electrode tabs 30 are correspondingly connected to the two positive electrode tab connection areas 11, and the two negative electrode tabs 40 are correspondingly connected to the two negative electrode tab connection areas 21. Thus, one positive electrode tab 30 and one negative electrode tab 40 are arranged as the electronic channel of the first winding body 103, the other positive electrode tab 30 and the other negative electrode tab 40 are arranged as the electronic channel of the second winding body 104, the using quantity of the positive electrode tabs 30 and the negative electrode tabs 40 is reduced as far as possible on the basis of meeting the current generation requirement of the first winding body 103 and the second winding body 104, and when the requirements of the battery on the charge-discharge speed and the conductive capability are not high, the production cost can be reduced to the maximum extent.

In the embodiment, the diameter of the first winding body 103 is also preferably equal to the diameter of the second winding body 104, so as to further reduce the performance difference between the first winding body 103 and the second winding body 104 connected in parallel, and to better improve the rate and cycle performance of the battery.

In another embodiment of the present invention, each positive electrode tab 30 is welded to the end of the first winding body 103 and the second winding body 104, and each negative electrode tab 40 is welded to the end of the first winding body 103 and the second winding body 104. With each anodal utmost point ear 30 welding back again with its whole welding to battery case's utmost point post, on the same way, with each negative pole utmost point ear 40 welding back again whole welding to utmost point post, so for the parallelly connected book core overall structure of the cylinder lithium cell of this embodiment is compacter, and it is more convenient to operate man-hour.

Of course, the end of each positive electrode tab 30 may not be welded, and each positive electrode tab 30 may be connected to an external electrode column in a distributed manner, and similarly, the end of each negative electrode tab 40 may not be welded, but may be connected to an external electrode column in a distributed manner, and may be selected as needed in design, and is not limited herein.

In another embodiment of the present invention, as shown in fig. 1 and 2, the cathode film 10 includes an aluminum foil 12 and a cathode coating layer 13 coated on the aluminum foil 12, the cathode coating layer 13 avoids each cathode tab 30, i.e. the cathode coating layer 13 avoids each cathode tab connection area 11; the negative electrode diaphragm 20 includes a copper foil 22 and an anode coating layer 23 coated on the copper foil 22, and the anode coating layer 23 avoids each negative electrode tab 40, that is, the anode coating layer 23 avoids each negative electrode tab connection area 21. Therefore, each positive electrode tab 30 is not contacted with the cathode coating layer 13, and each negative electrode tab 40 is not contacted with the anode coating layer 23, so as to avoid the chemical deposition on the positive electrode tab 30 or the negative electrode tab 40 and the influence on the service life of the positive electrode tab 30 or the negative electrode tab 40.

In this embodiment, the cathode coating layer 13 may be an electrolytic material layer such as a lithium cobaltate coating layer, a lithium manganate coating layer, or a lithium iron phosphate coating layer, and the anode coating layer 23 may be a material layer such as a graphite layer or a tin layer.

In another embodiment of the present invention, the positive electrode tab 30 is an aluminum tab, and the negative electrode tab 40 is a nickel tab, so that the material selection is convenient and the production process is mature.

The utility model discloses another technical scheme is: a cylindrical lithium battery (not shown) comprises the cylindrical lithium battery parallel winding core.

The cylindrical lithium battery of the utility model, because the parallel winding core of the cylindrical lithium battery is used as the electric core, the parallel connection is realized in the battery shell, thereby saving the space occupied by the battery shell after parallel connection, reducing the volume of the battery occupied by the battery, and being beneficial to the miniaturization design of electronic products using parallel batteries; and, the parallelly connected book core of cylinder lithium cell uses same book core main part 100 to convolute and makes, and the performance difference is less, and battery rate performance is better.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a parallelly connected book core of cylinder lithium cell, includes rolls up the core main part, roll up the core main part and include positive diaphragm, the negative pole diaphragm that the stromatolite set up and be located positive diaphragm with diaphragm between the negative pole diaphragm, its characterized in that:

the cylindrical lithium battery parallel winding core further comprises a plurality of positive electrode tabs and a plurality of negative electrode tabs, wherein each positive electrode tab is arranged on the positive electrode film at intervals and led out along the width direction, each negative electrode tab is arranged on the negative electrode film at intervals and led out along the width direction, and the leading-out directions of the positive electrode tabs and the negative electrode tabs are opposite;

roll up the core main part and be provided with relative first winding end and second winding end along length direction, first winding end court the middle part of rolling up the core main part is convoluteed and is formed first winding body, the second winding end court the middle part of rolling up the core main part is convoluteed and is formed with the second winding body that first winding body offseted, partly anodal utmost point ear and partly negative pole utmost point ear is located first winding body, another part anodal utmost point ear and another part negative pole utmost point ear is located the second winding body.

2. The parallel connection winding core for the cylindrical lithium batteries according to claim 1, is characterized in that: the first winding end and the second winding end are wound towards the same side part to form the first winding body and the second winding body which are arranged at the same side.

3. The parallel connection winding core for the cylindrical lithium batteries according to claim 1, is characterized in that: the first winding end and the second winding end are wound towards opposite side parts to form the first winding body and the second winding body which are arranged on different sides.

4. The parallel connection winding core for the cylindrical lithium batteries according to claim 1, is characterized in that: the diameter of the first winding body is equal to that of the second winding body, the positive electrode lugs are arranged on the positive electrode film at uniform intervals, the number of the positive electrode lugs of the first winding body is equal to that of the positive electrode lugs of the second winding body, the number of the negative electrode lugs of the first winding body is equal to that of the negative electrode lugs of the second winding body, and the number of the negative electrode lugs of the first winding body is equal to that of the negative electrode lugs of the second winding body.

5. The parallel connection winding core for the cylindrical lithium batteries according to claim 1, is characterized in that: the parallel connection roll core of the cylindrical lithium battery comprises two positive pole lugs and two negative pole lugs, and two positive pole lugs are respectively located in the first winding body and the second winding body, and two negative pole lugs are respectively located in the first winding body and the second winding body.

6. The parallel connection winding core for the cylindrical lithium battery as claimed in any one of claims 1 to 5, wherein: the positive electrode tabs extend out of the end parts of the first winding body and the second winding body to be connected in a welding mode, and the negative electrode tabs extend out of the end parts of the first winding body and the second winding body to be connected in a welding mode.

7. The parallel connection winding core for the cylindrical lithium battery as claimed in any one of claims 1 to 5, wherein: the anode diaphragm comprises an aluminum foil and a cathode coating layer coated on the aluminum foil, and the cathode coating layer avoids each anode tab.

8. The parallel connection winding core for the cylindrical lithium battery as claimed in any one of claims 1 to 5, wherein: the negative electrode diaphragm comprises a copper foil and an anode coating layer coated on the copper foil, and the anode coating layer is avoided from the negative electrode tabs.

9. The parallel connection winding core for the cylindrical lithium battery as claimed in any one of claims 1 to 5, wherein: the positive electrode lug is an aluminum lug, and the negative electrode lug is a nickel lug.

10. A cylindrical lithium battery, characterized by comprising the cylindrical lithium battery parallel winding core of any one of claims 1 to 9.