Cylindrical lithium battery and electronic equipment

Abstract

The utility model discloses a cylindrical lithium battery and electronic equipment, the battery comprises a shell, a roll core and a cover plate, one end face of the roll core extends to form a positive tab cluster, the other end face of the roll core extends to form a negative tab cluster, the number of the positive tab cluster and the number of the negative tab cluster are both at least one and are both tab clusters of arc structures, the circle centers of arcs of the adjacent positive tab clusters are the same, and the circle centers of the arcs of the adjacent negative tab clusters are the same. Gaps are formed between the adjacent positive tab clusters, the circle centers of the arcs of the adjacent negative tab clusters are the same, gaps are formed between the adjacent negative tab clusters, and the area, not covered by the tab clusters, of the end face of the roll core serves as an electrolyte injection channel. According to the utility model, the electrolyte injection efficiency and effect are improved, the electrolyte injection efficiency and the consistency of electrolyte absorption and electrolyte retention are improved, and the consistency of battery performance is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technology field, concretely relates to a cylindrical lithium battery and electronic equipment. BACKGROUND

[0002] The full tab (or no tab) cylindrical lithium battery, before the tab (current collector) and the current collecting disc of the cover plate of the lithium battery are welded, the positive and negative tabs at both ends of the battery are first pressed flat or rubbed flat, but in the process of flattening the tab, the gap between the copper foil / aluminum foil tab at both ends of the lithium battery as the current collector is extruded and the space is compressed, and the gap is eliminated, so that the current collector (tab) is welded in a seamless state when the laser welding is carried out, to ensure that the current collector (tab) and the current collecting disc can be seamlessly fused and welded, so as to achieve the expected effect of laser welding.

[0003] Small cylindrical lithium batteries have small capacity and small charging and discharging current, and are welded together with the positive / negative current collector after the external metal belt is welded together (the positive tab is welded with the aluminum belt as the tab and the aluminum foil as the current collector, and the negative tab is welded with the copper foil or nickel belt as the tab and the copper foil as the current collector), and the positive tab or the negative tab is welded together with the current collecting disc or the shell of the small cylindrical lithium battery cover plate, to lead the current out of the external circuit of the battery. Generally, according to the capacity of the small cylindrical battery, from small to large, or the working battery of the battery, from small to large, the number of tabs welded with the positive / negative tab of the small cylindrical lithium battery is increased from 1 to 4, but the number of tabs exceeds 4, because the number of tabs is too large, in addition to occupying the internal capacity, the volume of the tab and the space occupied by the tab after bending increase, the control of the tab distribution and the welding of the tab and the cover plate current collecting disc or the welding with the shell increase the difficulty of the process, and the consistency of the battery welding effect and the assembly effect cannot be guaranteed.

[0004] The larger capacity battery usually uses the full tab tab structure of the positive / negative electrode to wind and assemble.

[0005] The large cylindrical battery with capacity exceeding 10Ah mostly uses the full tab tab structure of the positive / negative electrode to wind and assemble.

[0006] In the prior art, the conventional structure before winding of the full tab battery is shown in Figure 1 (from top to bottom, the negative tab, the separator, the positive tab, and the arrow indicates the electron flow path).

[0007] For the conventional positive / negative full tab structure of the cylindrical battery, the aluminum foil and copper foil as the battery current collector are exposed at both ends of the cylindrical battery, and the aluminum foil and copper foil exposed at both ends are distributed as the positive / negative tab and the cover plate of the cylindrical battery to be welded, thereby realizing the function of leading the current from the inside to the outside circuit. However, the following defects still exist:

[0008] Since the gap between the copper foil / aluminum foil tabs as the current collector at both ends of the lithium battery needs to be squeezed and compressed in space to eliminate the current collector gap, although the gap between the current collector (tab) at both ends of the lithium battery is squeezed and compressed in space and tightly contacts with the current collector disc of the cover plate, the majority of the channels for absorbing and infiltrating liquid of the cylindrical lithium battery are blocked, which increases the difficulty of absorbing electrolyte during liquid injection of the cylindrical lithium battery, affects the efficiency and effect of liquid injection of the cylindrical lithium battery, and also affects the consistency of the liquid absorption amount and the consistency of the battery performance among the single cylindrical batteries.

[0009] In view of the problems caused by the structure of the existing cylindrical lithium battery, it is necessary to provide a cylindrical lithium battery to overcome the shortcomings of the prior art. SUMMARY

[0010] The purpose of the present application is to provide a cylindrical lithium battery and electronic equipment. Based on this cylindrical lithium battery, compared with the conventional positive / negative full tab structure of the cylindrical battery, the liquid injection efficiency is improved, the consistency of the electrolyte injection efficiency, liquid absorption and liquid retention amount is improved, and the consistency of the battery performance is further improved.

[0011] In order to achieve the above-mentioned purpose, the present application provides a cylindrical lithium battery, which comprises a shell, a roll core located in the shell, a cover plate arranged at the opening of the end of the shell, and the cover plate is used to seal the roll core in the shell. One end surface of the roll core extends a positive tab cluster, and the other end surface extends a negative tab cluster. The positive tab cluster and the negative tab cluster are at least one, and are arc-shaped tab clusters. The centers of the arcs of adjacent positive tab clusters are the same, and there is a gap between adjacent positive tab clusters to form an electrolyte injection channel. The centers of the arcs of adjacent negative tab clusters are the same, and there is a gap between adjacent negative tab clusters to form an electrolyte injection channel. The area of the end surface of the roll core which is not covered by the tab cluster serves as an electrolyte injection channel.

[0012] In a preferred embodiment, in each of the tab clusters before bending, the tabs are sequentially arranged along the radial direction of the roll core, and the height of the tab located in the middle of the tab cluster is greater than or equal to the height of the tab located at the end of the tab cluster.

[0013] In a preferred embodiment, in the same tab cluster before bending, all the tabs have equal height and equal width.

[0014] In a preferred embodiment, the height of the tabs located in the middle of the tab cluster is greater than the height of the tabs located at the end of the tab cluster, and the width of the tabs located at the outer side is greater than the width of the tabs located at the inner side.

[0015] In a preferred embodiment, the width of the tabs located at the outer side in the tab cluster before bending is greater than the width of the tabs located at the inner side, and the tab cluster before bending comprises a first tab cluster part and a second tab cluster part located at the outer side of the first tab cluster part, the height of the tabs located at the outer side in the first tab cluster part is greater than the height of the tabs located at the inner side, and the height of the tabs located at the outer side in the second tab cluster part is less than the height of the tabs located at the inner side.

[0016] In a preferred embodiment, the number of the positive tab clusters and the number of the negative tab clusters are both greater than 1, and all the positive tab clusters are uniformly arranged along the circumferential direction of one end surface of the winding core, and all the negative tab clusters are uniformly arranged along the circumferential direction of the other end surface of the winding core.

[0017] In a preferred embodiment, the number of the positive tab clusters and the number of the negative tab clusters are both greater than 1, and all the positive tab clusters are uniformly arranged along the circumferential direction of one end surface of the winding core, and all the negative tab clusters are uniformly arranged along the circumferential direction of the other end surface of the winding core.

[0018] In a preferred embodiment, the cover plate comprises a first cover plate covering the opening at one end of the shell and a second cover plate covering the opening at the other end of the shell, the first cover plate comprises a positive lithium battery collector plate welded with the positive tab cluster, and the second cover plate comprises a negative lithium battery collector plate welded with the negative tab cluster.

[0019] In a preferred embodiment, the welding between the positive tab cluster and the positive lithium battery collector plate is laser welding, and the welding between the negative tab cluster and the negative lithium battery collector plate is laser welding.

[0020] The utility model also provides an electronic equipment, including equipment body and the battery group for equipment body power supply, its characterized in be that the battery group includes at least two the cylindrical lithium battery of described.

[0021] Compared with the prior art, the cylindrical lithium battery has the beneficial effects that: the positive tab cluster and the negative tab cluster are arranged at the two ends of the winding core, the tab cluster has a circular arc structure, the centers of the circular arcs of all the positive tab clusters are the same, there is a gap between adjacent positive tab clusters to form an electrolyte injection channel, the centers of the circular arcs of all the negative tab clusters are the same, there is a gap between adjacent negative tab clusters to form an electrolyte injection channel, such design provides an electrolyte injection transmission channel, improves the efficiency and effect of electrolyte injection, improves the consistency of the efficiency, liquid absorption and liquid retention amount of electrolyte injection, and further improves the consistency of battery performance. The cylindrical lithium battery of the embodiment is suitable for various capacities. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of not paying creative labor.

[0023] Figure 1 The existing explosion structure schematic diagram before winding the battery cell;

[0024] Figure 2 The battery core of the present application provides a cluster of tab bending and flattening state schematic diagram;

[0025] Figure 3 The present application provides a structure schematic diagram of the winding core;

[0026] Figure 4 The present application provides a structure schematic diagram of the winding core; Figure 3 The top view of the winding cylindrical battery cell provided by the present application;

[0027] Figure 5 The present application provides a structure schematic diagram of the winding core of the present application;

[0028] Figure 6 The present application provides a structure schematic diagram of the winding core of the present application;

[0029] Figure 7 The present application provides a structure schematic diagram of the winding core of the present application;

[0030] Figure 8 The present application provides a structure schematic diagram of the winding core of the present application;

[0031] Figure 9 The present application provides a structure schematic diagram of the winding core of the present application;

[0032] The drawing label: 100, winding core, 10, positive tab cluster, 20, negative tab cluster. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] In the embodiments of the present application, a winding cylindrical battery cell is provided.

[0035] Please refer to Figure 2 A cylindrical lithium battery includes a shell, a winding core 100 located in the shell, a cover plate arranged at an opening of an end of the shell, and the cover plate is used to seal the winding core 100 into the shell. One end surface of the winding core 100 extends a positive tab cluster 10, and the other end surface extends a negative tab cluster 20. The positive tab cluster 10 and the negative tab cluster 20 are at least one, and are arc-shaped tab clusters. The centers of the arcs of adjacent positive tab clusters 10 are the same, and gaps are provided between adjacent positive tab clusters 10 to form electrolyte injection channels. The centers of the arcs of adjacent negative tab clusters 20 are the same, and gaps are provided between adjacent negative tab clusters 20 to form electrolyte injection channels.

[0036] When the positive tab cluster 10 and / or the negative tab cluster 20 is one, the area on the end surface of the winding core 100 that is not covered by the tab cluster serves as an electrolyte injection channel. If there is only one positive tab cluster 10 or one negative tab cluster 20, since the tab cluster is arc-shaped, i.e., the tab cluster is not a 360-degree wrap-around type, the end surface of the winding core 100, except for the area where the tab cluster is located, serves as a cylindrical battery injection channel. When the number of tab clusters on one end surface is greater than one, adjacent positive tab clusters 10 do not contact in the tangential direction, and adjacent negative tab clusters 20 do not contact in the tangential direction. The gap penetrates the center of the end surface of the winding core 100 and the outer edge of the end surface of the winding core 100. The area on the end surface of the winding core 100 that is not covered by the tab cluster includes the gap, and the gaps between adjacent positive tab clusters 10 form electrolyte injection channels, and the gaps between adjacent negative tab clusters 20 form electrolyte injection channels. The area on the end surface of the winding core 100 that is not covered by the tab cluster serves as an electrolyte injection channel. The tab cluster is a flattened tab cluster, which is not limited to being flattened by pressing, but also flattened by kneading.

[0037] It can be understood that the winding cylindrical core 100 comprises positive electrode sheets, negative electrode sheets and separators between the positive electrode sheets and the negative electrode sheets, and the positive electrode sheets have positive electrode tabs, and the negative electrode sheets have negative electrode tabs. The tabs are partially on the electrode sheets and partially protrude from the electrode sheets. The tabs are generally rectangular in overall structure, and it can be understood that the tabs can also be trapezoidal, or rhombic, or quadrilateral, etc. It can be further understood that the tabs have bevels or round corners, etc. In this embodiment, the tabs in the tab cluster are defined as the tab parts protruding from the electrode sheets, i.e. the tabs in the tab cluster protrude from the electrode sheets. The tab cluster has at least two tabs, and the tabs are arranged in layers to form the tab cluster. Before bending, all the tabs in the tab cluster are sequentially arranged along the direction from the center of the end face of the winding cylindrical core 100 to the outer edge. Since the core is a winding cylindrical core, each tab is a circular arc in the top view of the end face of the core 100, so the tab cluster composed of several tabs is a circular arc structure.

[0038] Here, the radii of the adjacent positive tab clusters 10 are equal, and the radii of the adjacent negative tab clusters 20 are equal. In the top view of the end face of the core 100, the circular arc of the tab cluster has a certain thickness, and the equal radii indicate that the radii have an overlap (an overlapping interval) and the gap can form an electrolyte injection channel. For example, the radius of one tab cluster is 5mm-15mm, and the radius of the adjacent tab cluster is 6mm-17mm.

[0039] Preferably, the radii of all the positive tab clusters 10 are equal, and the radii of all the negative tab clusters 20 are equal.

[0040] Preferably, the inner diameter and the outer diameter of the circular arc structure of all the positive tab clusters 10 are the same, and the inner diameter and the outer diameter of all the negative tab clusters 20 are the same. Specifically, the shape and size of all the positive tab clusters 10 are the same, and the shape and size of all the negative tab clusters 20 are the same.

[0041] It should be noted that the number of positive tab clusters 10 is equal to the number of negative tab clusters 20.

[0042] Referring to Figure 3 and Figure 4 , as an embodiment in which the number of positive tab clusters 10 and the number of negative tab clusters 20 are both equal to 1, in the figure, the tab cluster is a pre-bending tab cluster, and it can be understood that the pre-bending tab cluster is also a circular arc.

[0043] Preferably, the number of positive tab clusters 10 and the number of negative tab clusters 20 are both greater than 1, and further, all the positive tab clusters 10 are uniformly arranged along the circumferential direction of one end face of the core 100, and all the negative tab clusters 20 are uniformly arranged along the circumferential direction of the other end face of the core 100. Figure 2 In this embodiment, the number of positive tab clusters 10 is 6, and they are uniformly arranged, Figure 2The tab cluster in the middle of the positive tab cluster and the negative tab cluster after being bent (or after being bent and flattened).

[0044] Referring to Figure 5 Exemplified, the positional relationship schematic diagram of the number of the positive tab cluster 10 and the negative tab cluster 20 before being bent is 6, which does not represent that all the positive tab clusters 10 are located at one end of the winding core 100 and all the negative tab clusters 20 are located at the other end of the winding core 100.

[0045] The tab cluster includes a middle part and an end part, obviously, the end part is two, one of which is called an inner end, and the other end part is called an outer end, that is, the inner end and the outer end correspond to the center of the winding core 100, and the inner and outer refer to the end of the tab cluster that is closer to the winding core 100 and the end that is farther from the winding core 100. The distance between the outer tab and the center of the winding core 100 is greater than the distance between the inner tab and the center of the winding core 100. It should be noted that the inner and outer described herein are relative to the center of the winding core 100.

[0046] In each tab cluster before being bent, all the tabs in it are sequentially arranged along the radial direction of the winding core 100, and the tabs are stacked to form a tab cluster. The height of the tab is h1, that is, the height of the part of the tab protruding from the pole piece is h1, and the width of the tab is w1, that is, the width of the part of the tab protruding from the pole piece is w1.

[0047] In a preferred embodiment, the tab cluster before being bent is a tab cluster with a plurality of tabs arranged in a plurality of rows, and the plurality of rows of tabs are arranged in a plurality of columns. Figure 6 In the tab cluster before being bent, the height h1 of the tab located in the middle of the tab cluster is greater than the height h1 of the tab located at the end of the tab cluster, and the w1 of the tab located on the outer side of the winding core 100 is greater than the w1 of the tab located on the inner side of the winding core 100. At this time, the tab cluster can also be understood as a fan ring.

[0048] Further, the tab cluster includes a first tab cluster sub-body and a second tab cluster sub-body, the first tab cluster sub-body is located on the inner side of the second tab cluster sub-body, in the first tab cluster sub-body, the h1 of the tab located on the outer side is greater than the h1 of the tab located on the inner side, and the w1 of the tab located on the outer side is greater than the w1 of the tab located on the inner side; in the second tab cluster sub-body, the h1 of the tab located on the outer side is less than the h1 of the tab located on the inner side, and the w1 of the tab located on the outer side is greater than the w1 of the tab located on the inner side. That is, in the tab cluster, from the inside to the outside, the height of the tab (the h1 of the tab) gradually increases and then gradually decreases, and the width gradually increases.

[0049] In another preferred embodiment, in each tab cluster before bending, the dimension of the part of the tab protruding from the tab sheet is the same, that is, the width of the part of the tab protruding from the tab sheet is w1, h1 is equal between the tabs of the same tab cluster, and w1 is also equal, that is, h1 of the tab located in the middle of the tab cluster is equal to h1 of the tab located at the end of the tab cluster; w1 of the tab located in the middle of the tab cluster is equal to w1 of the tab located at the end of the tab cluster. Further, h1 and w1 are also equal between the tabs of different tab clusters.

[0050] Generally, the number of the positive tab clusters 10 is greater than or equal to 1 and less than or equal to 20.

[0051] In the art, after the tab clusters of the winding core 100 are bent and flattened, the cylindrical lithium battery is formed. Therefore, the height h1 described above can be understood as a length, that is, the bending and flattening make the tab cluster no longer stand upright, and the height (perpendicular to the end face of the winding core 100 and the end face of the battery) becomes the length (parallel or approximately parallel to the end face of the winding core 100 and the end face of the battery). Figures 3 to 5 Corresponding to the tab standing state; Figure 2 Corresponding to the winding core 100 after the tab is bent and flattened, Figure 2 The gap in the above formula is a narrow sector.

[0052] It can be understood that the shell has openings at both ends, and each opening has a corresponding cover plate, which are respectively referred to as a first cover plate and a second cover plate. The first cover plate includes a positive lithium battery current collector, and the second cover plate includes a negative lithium battery current collector. The positive tab cluster 10 is welded to the positive lithium battery current collector, and the negative tab cluster 20 is welded to the negative lithium battery current collector.

[0053] In the embodiment, the welding of the positive tab cluster 10 to the positive lithium battery current collector is laser welding, and the welding of the negative tab cluster 20 to the negative lithium battery current collector is laser welding.

[0054] The positive lithium battery current collector and the negative lithium battery current collector are collectively referred to as a current collector. The current collector can be a circular one without a small hole, a current collector with a small hole, a current collector with a circular hole, or a current collector with a circular hole and a rib. Preferably, the current collector is a circular one with a small hole. The current collector can be circular or polygonal. Figure 7 FIG. 1 is a structural schematic diagram of the current collector in an embodiment. Figure 8 FIG. 2 is a structural schematic diagram of the current collector in an embodiment from two perspectives, Figure 9 FIG. 3 is a structural schematic diagram of the current collector in an embodiment.

[0055] The utility model discloses a laser die cutting is shaped to the positive and negative pole piece, negative pole piece side edge empty foil area and gets the special structure of the pole lug, these pole lug die cutting is according to the specific design gap distance, according to the winding electric core from inside to outside direction, according to the die cutting pitch, width and height die cutting of setting positive and negative pole piece's multi-pole lug, winding is carried out to the positive and negative pole piece and diaphragm according to the specific angle in the winding, winding gets the pole lug cluster of the specific design angle graduation, in multiple directions by inside to outside step by step radial distribution, usually, each pole lug cluster has the gap of narrow fan -shaped between.

[0056] The winding cylindrical battery pole lug bending and beating flat / rubbing flat processing can obtain the positive / negative pole current collector end face composed of the pole lug cluster of the radial distribution of the specific angle in multiple directions and the gap of narrow fan -shaped between each pole lug cluster, that is, after bending and beating flat / rubbing flat processing, the gap also does not contact between adjacent pole lug clusters, on this positive / negative pole current collector end face, the pole lug cluster area is as the area welded with the cover plate, and the gap of narrow fan -shaped between each pole lug cluster is as the cylindrical battery liquid injection channel of the current collector structure of such end face welding.

[0057] According to the detailed description of the specific embodiment of the utility model above, it can be seen that, compared with the prior art, the utility model has a gap between the pole lug clusters, or the end face of the winding core 100 only has a circular arc structure pole lug cluster, and the area without the pole lug cluster on the end face of the winding core 100 can be used as an electrolyte injection transmission channel, thereby improving the efficiency and effect of electrolyte injection, improving the consistency of the efficiency, liquid absorption and liquid retention of electrolyte injection, and further improving the consistency of battery performance. The cylindrical lithium battery of the embodiment is suitable for various capacities.

[0058] In the prior art, the larger capacity battery is wound and assembled by using the pole piece structure with full pole lug for both the positive and negative pole pieces, or by using the pole piece structure with full pole lug for one of the positive and negative pole pieces and using the aluminum or copper / nickel metal strip as the pole lug for the other one. For the cylindrical lithium battery with the positive and negative pole pieces and the welding metal strip structure, the following disadvantages exist when large current charging and discharging is performed:

[0059] 1) Since the aluminum or copper foil of the positive and negative pole pieces is welded with the aluminum or copper strip as the positive and negative pole lug, the current carrying area of the positive and negative pole is determined by the width, thickness and number of the welding metal strip (pole lug). Due to the limitation of the internal volume of the lithium battery and the limitation of the specific volume energy density requirement, the number of the pole lug cannot be increased too much, so that the current carrying capacity of the positive and negative pole lug is insufficient when the battery is charged and discharged at a large current, the internal resistance of the battery is large, the battery is easy to heat, the overcurrent capacity is poor, the large current working capacity of the battery is insufficient, and the safety of the battery is low.

[0060] 2) For the negative lug and the negative point bottom shell welding, generally using resistance welding, usually cylindrical battery in the negative lug and the steel shell welding together, the welding area is small, the flow area is small, resulting in the battery resistance increases.

[0061] 3) The welding surface of the general cylindrical negative point bottom is small, the welding strength is not easy to control, the welding quality is poor, the point bottom is easy to be virtual, the fixing ability of the winding core 100 is also weak, the connection between the lug and the steel shell is easy to loosen, and the internal resistance of the battery in the vibration application scene is unstable.

[0062] In the prior art, for the conventional positive / negative full lug structure of the cylindrical battery, the positive / negative lug (current collector) at both ends of the full lug cylindrical battery is actually applied only to the area of the laser welding spot, and the other non-welded part is actually not applied, but occupies the space at both ends of the cylinder and the channel for the electrolyte to enter the side surface of the cylindrical lithium battery during liquid injection; The full lug cylindrical battery increases the difficulty of electrolyte entering the side surface of the battery during liquid injection, seriously reduces the liquid injection efficiency, and affects the consistency of the electrolyte absorption and retention capacity of the current, thereby affecting the consistency of the performance of the cylindrical battery.

[0063] Compared with the cylindrical lithium battery with positive and negative electrode plates and welding metal strip structure, the lug structure of the present application is different, and the number of lugs of the present application is large, so that the lug has sufficient current carrying capacity during large current charging and discharging of the battery, the internal resistance of the battery is reduced, the battery is not easy to heat, the overcurrent capacity is improved, the large current working capacity of the battery is improved, and the safety of the battery is improved. The embodiment can ensure that the positive / negative lug cluster 20 and the current collector of the cylindrical battery have a large current conduction and current carrying area, increase the lithium ion electron transmission channel during charging and discharging, and be beneficial to reducing the internal resistance and reducing the heat energy loss during charging and discharging.

[0064] The plurality of lug clusters of the present embodiment are arranged in a radial manner to laser weld the ends of the positive / negative lugs and the current collector, thereby increasing the stability of the internal structure.

[0065] The present embodiment retains the area not covered by the lug cluster on the end face of the winding core 100 as an electrolyte injection channel to allow the electrolyte to penetrate into the cylindrical battery and each layer of the cylindrical surface; it is beneficial to improve the efficiency of electrolyte injection, the consistency of liquid absorption and liquid retention, and the consistency of battery performance.

[0066] The present embodiment also provides an electronic device comprising a device body and a battery pack for supplying power to the device body, the battery pack comprising at least two batteries of the cylindrical lithium battery. It can be understood that,

[0067] Since the higher the consistency of the battery is, the better the overall performance of the battery pack is, the longer the service life is, the higher the safety is and the higher the overall efficiency is, the electronic device adopts the cylindrical lithium battery with the good consistency, so that the performance of the electronic device is better.

[0068] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A cylindrical lithium battery, comprising a casing, a wound core located within the casing, and a cover plate disposed at an opening at one end of the casing, the cover plate being used to seal the wound core into the casing, characterized in that, One end face of the core extends with a positive electrode lug, and the other end face extends with a negative electrode lug. There is at least one positive electrode lug and a negative electrode lug. Both are arc-shaped electrode lugs. The centers of the arcs of adjacent positive electrode lugs are the same, and there is a gap between adjacent positive electrode lugs to form an electrolyte injection channel. The centers of the arcs of adjacent negative electrode lugs are the same, and there is a gap between adjacent negative electrode lugs to form an electrolyte injection channel.

2. A cylindrical lithium battery as described in claim 1, characterized in that, In each of the tab clusters before bending, the tabs are arranged sequentially along the radial direction of the core, and the height of the tab located in the middle of the tab cluster is greater than or equal to the height of the tab located at the end of the tab cluster.

3. A cylindrical lithium battery as described in claim 2, characterized in that, In the same cluster of tabs before the bend, all tabs are of equal height and equal width.

4. A cylindrical lithium battery as described in claim 2, characterized in that, The height of the electrode ear located in the middle of the electrode ear cluster is greater than the height of the electrode ear located at the end of the electrode ear cluster, and the width of the electrode ear located on the outer side is greater than the width of the electrode ear located on the inner side.

5. A cylindrical lithium battery as described in claim 4, characterized in that, Before bending, the width of the outer pole ear in the pole ear cluster is greater than the width of the inner pole ear. Before bending, the pole ear cluster includes a first pole ear cluster segment and a second pole ear cluster segment located outside the first pole ear cluster segment. The height of the outer pole ear in the first pole ear cluster segment is greater than the height of the inner pole ear, and the height of the outer pole ear in the second pole ear cluster segment is less than the height of the inner pole ear.

6. A cylindrical lithium battery as described in claim 1, characterized in that, The number of positive electrode tabs and the number of negative electrode tabs are both greater than 1. All positive electrode tabs are evenly arranged circumferentially along one end face of the core, and all negative electrode tabs are evenly arranged circumferentially along the other end face of the core.

7. A cylindrical lithium battery as described in claim 1, characterized in that, The number of positive electrode ear clusters and the number of negative electrode ear clusters are equal, and all positive electrode ear clusters have the same shape and size, and all negative electrode ear clusters have the same shape and size.

8. A cylindrical lithium battery as described in claim 1, characterized in that, The cover plate includes a first cover plate covering one end opening of the housing and a second cover plate covering the other end opening of the housing. The first cover plate includes a positive electrode lithium battery current collector plate welded to the positive electrode tab cluster, and the second cover plate includes a negative electrode lithium battery current collector plate welded to the negative electrode tab cluster.

9. A cylindrical lithium battery as described in claim 8, characterized in that, The positive electrode tabs are welded to the positive electrode lithium battery current collector by laser welding, and the negative electrode tabs are welded to the negative electrode lithium battery current collector by laser welding.

10. An electronic device, comprising a device body and a battery pack for powering the device body, characterized in that, The battery pack includes at least two cylindrical lithium batteries as described in any one of claims 1 to 9.

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