CN220569788U - Cylindrical battery cell, battery pack and electronic equipment - Google Patents

Abstract

The utility model provides a cylindrical cell, comprising: a case, an electrode assembly, a current collecting member, an end cap, and a cap plate; the shell comprises an end wall and a side wall surrounding the end wall, and an opening is formed on one side of the side wall, which faces away from the end wall; the electrode assembly is arranged in the shell, and one side of the electrode assembly facing the opening is provided with a first tab; the current collecting component is arranged on one side of the electrode assembly facing the opening, and is welded with the first tab; the end cover is closed, one side of the end cover, which is away from the electrode assembly, comprises a welding area, the end cover is welded with the current collecting member in the welding area, the end cover also comprises a liquid injection hole, and the liquid injection hole and the welding area are arranged at intervals on the surface of the end cover, which is away from the electrode assembly; the cover plate is arranged on the end cover, and the cover seals the liquid injection hole. This cylinder electricity core sets up through annotating liquid hole and welding interval on the end cover, can improve the welding slag in end cover surface welding area and enter into the electrode assembly inside through annotating liquid hole easily, influences the problem of electrode assembly normal operating.

Description

Cylindrical battery cell, battery pack and electronic equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a cylindrical cell, a battery pack and electronic equipment.

Background

With the development of lithium battery technology, the energy density of the battery cell is higher and higher, and the cylindrical battery cell can realize higher energy density due to higher assembly ratio, so that the battery cell is a current mainstream battery cell. The existing cylindrical battery cell is generally provided with an end cover in sealing connection with the opening end of the shell, and the end cover is in welding connection with the current collecting component to realize conductive connection between the end cover and the electrode assembly. The connection is such that the end cap surface will be formed with a weld zone. In order to facilitate the cell liquid injection, liquid injection holes are generally formed in the surface of the end cover. And then make the surface of end cover have notes liquid hole and welded zone simultaneously, therefore there is the welding slag to enter into the inside risk of electrode assembly through annotating liquid hole, has influenced electrode assembly's normal work.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present utility model provides a cylindrical battery cell, a battery pack and an electronic device, so as to improve the technical problem that welding slag in a welding area on the surface of an end cover is easy to enter into an electrode assembly through a liquid injection hole, and affect the normal of the electrode assembly.

To achieve the above and other related objects, the present utility model provides a cylindrical cell comprising: a case, an electrode assembly, a current collecting member, an end cap, and a cap plate; the housing comprises an end wall and a side wall surrounding the end wall, and an opening is formed on one side of the side wall, which faces away from the end wall; the electrode assembly is arranged in the shell, and one side of the electrode assembly, facing the opening, is provided with a first tab; the current collecting member is arranged on one side of the electrode assembly facing the opening, and is connected with the first tab; the end cover seals the opening, one side of the end cover, which is away from the electrode assembly, comprises a welding area, the end cover is welded with the current collecting member in the welding area, the end cover also comprises a liquid injection hole, and the liquid injection hole is arranged at intervals with the welding area on the surface of the end cover, which is away from the electrode assembly; the cover plate is mounted on the end cover and seals the liquid injection hole.

In one example of the cylindrical cell of the present utility model, the cover plate seals the liquid injection hole and the welding area simultaneously.

In an example of the cylindrical battery cell of the present utility model, a side of the end cap facing away from the electrode assembly includes a recess portion recessed toward the electrode assembly, the recess portion includes a first bottom wall and a second bottom wall, a height difference exists between the first bottom wall and the second bottom wall, the liquid injection Kong Kaishe is on the first bottom wall, and the welding area is on the second bottom wall.

In one example of the cylindrical cell of the present utility model, the second bottom wall is disposed lower than the first bottom wall.

In an example of the cylindrical battery cell of the present utility model, a side of the end cap facing away from the electrode assembly includes a recess portion recessed toward the electrode assembly, the recess portion includes a first bottom wall and a second bottom wall, the first bottom wall and the second bottom wall are disposed at equal heights, a protrusion is disposed between the first bottom wall and the second bottom wall, the protrusion separates the first bottom wall and the second bottom wall, the liquid injection Kong Kaishe is disposed on the first bottom wall, and the welding area is disposed on the second bottom wall.

In an example of the cylindrical cell of the present utility model, the shortest distance between the edge of the liquid injection hole and the welding area is 1.5-6 mm.

In an example of the cylindrical battery cell, the side of the concave part, which faces away from the electrode assembly, comprises a step hole, and the cover plate is installed in the step hole in a matching way.

In one example of the cylindrical cell of the present utility model, the recess is disposed in a central region of the end cap.

In one example of the cylindrical cell of the present utility model, the current collecting member includes a thickened portion, and the thickened portion is welded to the welding region.

The utility model also provides a battery pack, which comprises any one of the cylindrical battery cells.

The utility model further provides electronic equipment, which comprises the battery pack.

According to the cylindrical battery cell, the liquid injection hole and the welding zone are arranged at intervals on the surface of the end cover, which is away from the electrode assembly, so that the liquid injection hole is separated from the welding zone relatively, the liquid injection hole is far away from the welding zone, the probability of falling into the liquid injection hole when welding slag splashes in the welding process of the welding zone can be reduced, the probability of entering the electrode assembly from the welding slag can be further reduced, and the normal use of the electrode assembly is ensured; on the other hand, the probability that welding slag enters the electrode assembly through the liquid injection hole in the welding zone welding slag collecting process can be reduced, and the normal use of the electrode assembly is further ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a three-dimensional overall schematic of an embodiment of a cylindrical cell of the present utility model;

FIG. 2 is a cross-sectional view of the overall structure of an embodiment of a cylindrical cell of the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at area A;

FIG. 4 is an enlarged view of a portion of the mounting locations of the cover plate and the end cap in an embodiment of the cylindrical cell of the present utility model;

FIG. 5 is a three-dimensional schematic view of the overall structure of the end cap in one embodiment of the cylindrical cell of the present utility model;

FIG. 6 is a three-dimensional schematic view of the overall structure of an end cap in another embodiment of a cylindrical cell of the present utility model;

FIG. 7 is a schematic view of a partial installation of a cover plate and an end cap in another embodiment of a cylindrical cell according to the present utility model;

FIG. 8 is an enlarged partial view of region B of FIG. 7;

FIG. 9 is a schematic view showing the overall structure of an embodiment of a battery pack according to the present utility model;

fig. 10 is a schematic view showing a structure in which the battery pack of the present utility model is mounted on a vehicle.

Description of element reference numerals

100. A cylindrical cell; 110. a housing; 111. an end wall; 112. a sidewall; 113. an opening; 120. an electrode assembly; 121. a first tab; 122. a second lug; 130. a current collecting member; 131. a thickened portion; 1311. opening holes; 132. a body portion; 140. an end cap; 141. a welding area; 142. a liquid injection hole; 143. a recessed portion; 1431. a bottom wall of the concave cavity; 14311. a first bottom wall; 14312. a second bottom wall; 1432. a cavity sidewall; 144. a step hole; 145. a first chamber; 146. a second chamber; 150. a cover plate; 160. a protrusion; 170. an electrode terminal; 200. a battery pack; 210. a case; 211. a first box portion; 212. a second box portion; 300. an electronic device; 310. a working part.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.

It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.

Referring to fig. 1 to 10, the present utility model provides a cylindrical battery cell 100, a battery pack 200 and an electronic device 300, wherein the cylindrical battery cell 100 is configured such that a liquid injection hole 142 is formed on a surface of an end cap 140 facing away from an electrode assembly 120 and is spaced from a welding area 141, so that a probability that welding slag in the welding area 141 enters the electrode assembly 120 through the liquid injection hole 142 can be reduced, thereby ensuring normal use of the electrode assembly 120 and further reducing a failure rate in a use process of the cylindrical battery cell 100.

Referring to fig. 1 and 2, the structure of the cylindrical battery cell 100 is further described, and the cylindrical battery cell 100 includes: a case 110, an electrode assembly 120, a current collecting member 130, an end cap 140, and a cap plate 150. The case 110 has a receiving cavity formed therein for receiving the electrode assembly 120, an electrolyte (not shown), and other components, and the case 110 may be open at one end or at both ends. The specific dimensions of the case 110 may be determined according to the specific dimensions of the electrode assembly 120, for example, to meet the specifications 4680, 4695, 46120, etc. of the large cylindrical battery. The material of the housing 110 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and in order to prevent the housing 110 from rusting during long-term use, a layer of rust-preventing material, such as metallic nickel, etc., may be plated on the surface of the housing 110. Referring to fig. 2, in an example of a cylindrical cell 100 of the present utility model, a housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111, the end wall 111 being a closed end and an opening 113 opposite the end wall 111 being an open end. The end wall 111 and the side wall 112 may be integrally formed and connected, or may be separately formed and then welded and connected.

As shown in fig. 2, the electrode assembly 120 is accommodated in the case 110. The electrode assembly 120 is a component in the cell where electrochemical reactions occur. The case 110 may contain one or more electrode assemblies 120 therein. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector comprises a positive electrode coating area and a positive electrode lug connected to the positive electrode coating area, wherein the positive electrode coating area is coated with a positive electrode active material layer, and the positive electrode lug is not coated with the positive electrode active material layer. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, wherein the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene). In order to protect and insulate the battery cell, the battery cell can be coated with an insulating film, and the insulating film can be synthesized by PP, PE, PET, PVC or other high polymer materials.

Referring to fig. 2, in an example of the cylindrical battery cell 100 of the present utility model, an electrode assembly 120 is sealed and installed in a housing 110, two ends of the electrode assembly 120 in a length direction are respectively provided with a first tab 121 and a second tab 122, and polarities of the first tab 121 and the second tab 122 are opposite, wherein the first tab 121 faces an opening 113 of the housing 110, and the first tab 121 is a negative tab. In other embodiments, the first tab 121 may be a positive tab, and the second tab 122 may be a negative tab.

Referring to fig. 2, in an example of the cylindrical battery cell 100 of the present utility model, the end wall 111 of the housing 110 is provided with a through terminal mounting hole, and the electrode terminal 170 is hermetically and insulatively inserted into the terminal mounting hole, so long as the sealing insulation between the electrode terminal 170 and the end wall 111 can be achieved, the mounting manner of the electrode terminal 170 on the end wall 111 is not limited. The electrode assembly 120 has a second tab 122 on a side facing the end wall 111, and one end of the electrode terminal 170 may be directly welded to the second tab 122 or may be electrically connected to the second tab 122 through the current collecting member 130, which is not particularly limited.

Referring to fig. 2, in an example of the cylindrical battery cell 100 of the present utility model, a current collecting member 130 is disposed in the case 110 and located at a side of the electrode assembly 120 facing the opening 113, and the current collecting member 130 is welded to the first tab 121; the specific location and welding area of the welding connection of the current collecting member 130 and the first tab 121 are not limited as long as stable electrical connection requirements between the current collecting member 130 and the first tab 121 can be achieved. The end cap 140 is disposed at the opening 113 side of the case 110, and is located at a side of the current collecting member 130 remote from the electrode assembly 120; the outer edge of the end cap 140 is welded to the side wall 112 of the housing 110 such that the end cap 140 seals the opening 113 of the housing 110; the structural form of the welded connection between the outer edge of the end cap 140 and the side wall 112 of the case 110 is not limited as long as the strength requirement and the sealing requirement of the welded connection between the case 110 and the end cap 140 are satisfied.

Referring to fig. 2 and 3, the end cap 140 includes a liquid injection hole 142 on a side facing away from the electrode assembly 120; the cylindrical cell 100 further comprises a cover plate 150, wherein the cover plate 150 is welded on the end cover 140 and seals the liquid injection hole 142; the side of the end cap 140 facing away from the electrode assembly 120 further includes a welding area 141, and in the welding area 141, the end cap 140 is welded to the current collecting member 130 below, and the size and shape of the welding area 141 are not limited as long as the welding connection requirement between the end cap 140 and the current collecting member 130 can be satisfied; on the surface of the end cap 140 facing away from the electrode assembly 120, the liquid injection holes 142 and the welding area 141 are arranged at intervals, and the interval arrangement mode can be selected in various ways, for example, a certain distance is arranged between the liquid injection holes 142 and the welding area 141, a separation baffle is arranged between the liquid injection holes 142 and the welding area 141, and a height difference is arranged between the liquid injection holes 142 and the welding area 141. Through the interval arrangement of the liquid injection holes 142 and the welding areas 141, separation between the liquid injection holes 142 and the welding areas 141 can be realized, and the mutual staggered arrangement between the welding areas 141 and the liquid injection holes 142 is avoided, so that on one hand, the probability that welding slag falls into the liquid injection holes 142 in the welding process of the welding areas 141 can be reduced, and further, the probability that the welding slag enters the electrode assembly 120 can be reduced, and the normal use of the electrode assembly 120 is ensured; on the other hand, the probability that welding slag enters the electrode assembly 120 through the liquid injection holes 142 in the welding zone 141 welding slag collecting process can be reduced, the normal use of the electrode assembly 120 is further ensured, and the service life of the cylindrical battery cell 100 is prolonged.

Further, referring to fig. 3 and 4, in an example of the cylindrical battery cell 100 of the present utility model, the front projection of the cover plate 150 on the end cap 140 along the thickness direction of the end cap 140 simultaneously covers the welding area 141 and the injection hole 142 on the surface of the end cap 140, so that the cover plate 150 simultaneously covers the injection hole 142 and the welding area 141. The specific shape of the cover plate 150 is not limited, and may be any shape such as square, round, or rectangular, and the like, which can cover the liquid injection hole 142 and the welding area 141 at the same time. The arrangement is such that the cover plate 150 can cover the liquid injection hole 142 to prevent the electrolyte from leaking; and can avoid the welding printing in the welding area 141 and the oxidation corrosion caused by the contact of the atmosphere, and improve the stability of the welding connection between the end cover 140 and the current collecting member 130.

Referring to fig. 3 to 5, in an example of the cylindrical battery cell 100 of the present utility model, a side of the end cap 140 facing away from the electrode assembly 120 includes a recess portion 143 recessed toward the electrode assembly 120, the recess portion 143 includes a recess bottom wall 1431 and a recess side wall 1432 surrounding the recess bottom wall 1431, the recess bottom wall 1431 includes a first bottom wall 14311 and a second bottom wall 14312, and a height difference exists between the first bottom wall 14311 and the second bottom wall 14312, so long as a specific dimension of the height difference is not limited, and a step arrangement is formed between the first bottom wall 14311 and the second bottom wall 14312 in a height direction; the liquid injection hole 142 is formed on the surface of the first bottom wall 14311 and penetrates through the first bottom wall 14311 in the thickness direction, and the welding area 141 is located on the upper surface of the second bottom wall 14312. The height difference between the first bottom wall 14311 and the second bottom wall 14312 is set so that a step structure is formed between the inner wall of the liquid injection hole 142 and the edge of the welding zone 141, and the step structure can play a role in blocking the spatter of the welding slag of the welding zone 141, so that the probability that the welding slag of the welding zone 141 enters the electrode assembly 120 through the liquid injection hole 142 can be reduced, and the normal operation of the electrode assembly 120 is ensured.

Preferably, referring to fig. 4, in an example of the cylindrical battery cell 100 of the present utility model, along the thickness direction of the end cap 140, the dimension of the upper surface of the second bottom wall 14312 from the upper surface of the end cap 140 is greater than the dimension of the upper surface of the second bottom wall 14312 from the upper surface of the end cap 140, so that the second bottom wall 14312 is lower than the first bottom wall 14311 and is disposed in the recess 143. The arrangement is such that the position of the opening 113 of the liquid injection hole 142 on the first bottom wall 14311 is higher than the position of the welding zone 141 on the second bottom wall 14312, and therefore, when the welding zone 141 performs the welding operation, the welding slag is less likely to fall into the position of the opening 113 of the liquid injection hole 142 located at a high position, so that the probability of the welding slag entering the inside of the electrode assembly 120 through the liquid injection hole 142 can be further reduced.

Referring to fig. 6 to 8, in an example of the cylindrical battery cell 100 according to the present utility model, a side of the end cap 140 facing away from the electrode assembly 120 includes a recess portion 143 recessed toward the electrode assembly 120, the recess portion 143 includes a cavity bottom wall 1431 and a cavity side wall 1432 surrounding the cavity bottom wall 1431, the cavity bottom wall 1431 includes a first bottom wall 14311 and a second bottom wall 14312, and the first bottom wall 14311 is disposed at the same height as the second bottom wall 14312. Between the first bottom wall 14311 and the second bottom wall 14312, a protrusion 160 is provided, the protrusion 160 separating the first bottom wall 14311 from the second bottom wall 14312. Specifically, a first cavity 145 is defined between the protrusion 160, the first bottom wall 14311, and the cavity side wall 1432, and the liquid injection hole 142 is formed in the first cavity 145 and penetrates through the first bottom wall 14311 in the thickness direction; the protrusion 160, the second bottom wall 14312 and the cavity side wall 1432 enclose a second cavity 146, and the welding area 141 is disposed in the second cavity 146 and is located on the upper surface of the second bottom wall 14312. In this way, the protrusion 160 can play a role in separating, and when the welding operation is performed on the welding area 141, the protrusion 160 can effectively prevent welding slag in the second cavity 146 from splashing to the position of the liquid injection hole 142 in the first cavity 145, so that the probability that a welding seam enters into the electrode assembly 120 through the liquid injection hole 142 can be reduced, and the normal use of the electrode assembly 120 is ensured.

In order to better isolate the welding area 141 from the liquid injection hole 142 and further reduce the probability of the welding slag entering the liquid injection hole 142, in an example of the cylindrical battery cell 100 according to the present utility model, referring to fig. 8, further, the shortest distance L between the edge of the liquid injection hole 142 and the welding area 141 is set within a range of 1.5-6 mm, for example, the shortest distance L may be 1.5mm, 3mm, 6mm, or the like. By setting the shortest distance L between the edge of the liquid injection hole 142 and the welding area 141 within a range of 1.5-6 mm, on one hand, the probability of welding slag falling to the position of the liquid injection hole 142 can be effectively reduced by controlling the distance, so that the probability of welding slag of the welding area 141 entering the electrode assembly 120 through the liquid injection hole 142 can be further reduced on the basis of being provided with the protrusions 160, and the normal operation of the electrode assembly 120 is better ensured; on the other hand, because the ring diameter of the pressure head sealing ring of the general liquid injection nozzle is 1.5-2 mm, and the dimension L is set within 1.5-6 mm, the pressure head sealing ring can play a good sealing role when the liquid injection nozzle is used for injecting liquid, and the probability that welding slag in a welding area enters a liquid injection hole in the liquid injection process is further reduced.

Referring to fig. 4 and 8, in an example of the cylindrical battery cell 100 of the present utility model, a stepped hole 144 is formed at an end of the cavity sidewall 1432 facing away from the electrode assembly 120, the contour of the stepped hole 144 matches the contour of the outer circumference of the cap plate 150, and the cap plate 150 is fitted in the stepped hole 144 along the circumferential direction. The step holes 144 can improve the installation and positioning precision of the cover plate 150 on the end cover 140, and ensure the sealing connection effect of the cover plate 150. Further, to facilitate the circumferential positioning of the cover plate 150 on the end cap 140, in this embodiment, the cover plate 150 and the stepped hole 144 are in a circular structure coaxially disposed.

The shape of the recess 143 provided in the end cap 140 is not particularly limited, and may be any shape such as a disk shape, a circular ring shape, or a rectangular shape, and the position of the recess 143 on the end cap 140 is not particularly limited, and may be distributed in a central area of the end cap 140 or an outer peripheral area of the end cap 140, for example, so long as the requirement of the interval distribution between the welding area 141 and the liquid injection hole 142 is satisfied. Preferably, referring to fig. 5 and 6, in an example of the cylindrical cell 100 of the present utility model, the recess 143 is disposed at the center of the end cap 140. By arranging the concave part 143 at the center of the end cover 140, and further arranging the welding area 141 and the liquid injection hole 142 at the center of the end cover 140 correspondingly, the positioning between the liquid injection hole 142 and the liquid injection device can be facilitated when the battery cell is injected with liquid; meanwhile, in the welding process, the welding head can only move back and forth in the central area to finish the welding operation of the welding area 141, so that a better welding path can be obtained, and the welding efficiency between the end cover 140 and the current collecting member 130 is improved.

In order to further reduce the probability of the slag in the welding area 141 entering the liquid injection hole 142 during liquid injection, the surface of the welding area 141 where the welding operation is completed may be subjected to a glue coating operation. This can fix the slag of the welding zone 141 on the surface of the welding zone 141 by using the viscosity of the paste, thereby preventing the slag from moving down into the liquid injection hole 142 during liquid injection.

Referring to fig. 4, in an example of the cylindrical battery cell 100 of the present utility model, the current collecting member 130 includes a body portion 132 and a thickened portion 131, and the body portion 132 is connected to the thickened portion 131 by welding or integrally forming, which is not limited in particular; the main body 132 is welded to the first tab 121 below, and the thickened portion 131 is welded to the lower end surface of the welding region 141 in the recess 143 while abutting against it. The thickened portion 131 is provided with an opening 1311, the opening 1311 corresponds to the liquid injection hole 142 in the concave portion 143, and then electrolyte entering from the liquid injection hole 142 enters into the electrode assembly 120 through the opening 1311, so that the electrode plate and the diaphragm are better infiltrated. By arranging the thickened part 131, when laser penetration welding is performed between the concave part 143 and the thickened part 131 outside the shell 110, the welding difficulty can be reduced, the welding process window can be improved, the phenomenon of welding penetration of the current collecting member 130 can be reduced, and the welding quality can be improved; meanwhile, the probability of electrolyte pollution caused by the fact that welding slag enters the electrolyte from a welding position when the welding phenomenon occurs to the current collecting member 130 can be reduced; in addition, the risk of leakage of electrolyte from the weld-through locations can be reduced, and the service life of the cylindrical cell 100 can be further improved.

Referring to fig. 9, in an embodiment of a battery pack 200 of the present utility model, the battery pack 200 includes a case 210 and at least one cylindrical cell 100; the case 210 includes a first case portion 211 and a second case portion 212, where the first case portion 211 and the second case portion 212 are covered with each other to form an accommodating space, and the plurality of cylindrical battery cells 100 are accommodated in the accommodating space and may be connected in series and/or parallel with each other. The battery pack 200 may be, for example, a battery module, a battery pack, or the like.

Referring to fig. 10, in an example of the electronic device 300 of the present utility model, the electronic device 300 includes a working portion 310 and a battery pack 200, and the working portion 310 is electrically connected to the battery pack 200 to obtain power support. The working part 310 may be a unit part capable of taking the electric power of the battery pack 200 and making a corresponding work, such as a blade rotation unit of a fan, a dust suction working unit of a dust collector, a wheel driving unit in an electric vehicle, etc. The electronic device 300 may be a vehicle, a cellular phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the present application does not particularly limit the electronic device 300 described above. In an embodiment of the electronic device 300 of the present utility model, the electronic device 300 is a vehicle, the working portion 310 is a body of the vehicle, and the battery pack 200 is fixedly mounted on the body, so as to provide driving force for the vehicle, thereby realizing running of the vehicle.

According to the cylindrical battery cell 100, through the interval arrangement of the liquid injection holes 142 and the welding areas 141, separation between the liquid injection holes 142 and the welding areas 141 can be realized, and the mutual staggered arrangement between the welding areas 141 and the liquid injection holes 142 is avoided, so that on one hand, the probability that welding slag falls into the liquid injection holes 142 in the welding process of the welding areas 141 is reduced, and further, the probability that the welding slag enters the electrode assembly 120 is reduced, and the normal use of the electrode assembly 120 is ensured; on the other hand, the probability that welding slag enters the electrode assembly 120 through the liquid injection holes 142 in the welding zone 141 welding slag collecting process can be reduced, the normal use of the electrode assembly 120 is further ensured, and the service life of the cylindrical battery cell 100 is prolonged. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance. The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. A cylindrical cell, comprising:

a housing comprising an end wall and a side wall surrounding the end wall, the side wall being formed with an opening on a side facing away from the end wall;

an electrode assembly disposed in the case, the electrode assembly having a first tab on a side facing the opening;

a current collecting member disposed at a side of the electrode assembly facing the opening, and connected with the first tab;

the end cover seals the opening, one side of the end cover, which is away from the electrode assembly, comprises a welding area, the end cover is welded with the current collecting member in the welding area, the end cover also comprises a liquid injection hole, and the liquid injection hole is arranged at intervals with the welding area on the surface of the end cover, which is away from the electrode assembly;

and the cover plate is arranged on the end cover and seals the liquid injection hole.

2. The cylindrical cell of claim 1, wherein the cover plate seals the fill hole and the weld area simultaneously.

3. The cylindrical cell of claim 2, wherein a side of the end cap facing away from the electrode assembly includes a recess recessed toward the electrode assembly, the recess including a first bottom wall and a second bottom wall, a height difference between the first bottom wall and the second bottom wall, the fill Kong Kaishe being on the first bottom wall and the weld zone being on the second bottom wall.

4. The cylindrical cell of claim 3, wherein the second bottom wall is disposed lower than the first bottom wall.

5. The cylindrical battery cell according to claim 2, wherein a side of the end cap facing away from the electrode assembly includes a recess portion recessed toward the electrode assembly, the recess portion includes a first bottom wall and a second bottom wall, the first bottom wall is disposed at the same height as the second bottom wall, a protrusion is disposed between the first bottom wall and the second bottom wall, the protrusion separates the first bottom wall from the second bottom wall, the liquid injection Kong Kaishe is disposed on the first bottom wall, and the welding area is disposed on the second bottom wall.

6. The cylindrical cell of claim 5, wherein a shortest distance between the edge of the fluid injection hole and the welding region is 1.5-6 mm.

7. The cylindrical cell according to any one of claims 3 to 6, wherein a side of the recess facing away from the electrode assembly comprises a stepped bore, the cover plate being fittingly mounted within the stepped bore.

8. The cylindrical cell of claim 6, wherein the recess is disposed in a central region of the end cap.

9. The cylindrical cell of claim 7, wherein the current collecting member comprises a thickened portion, the thickened portion being welded to the weld zone.

10. A battery comprising a cylindrical cell as claimed in any one of claims 1 to 8.

11. An electronic device comprising the battery pack of claim 10.