CN217009372U - Battery with a battery cell - Google Patents

Abstract

The utility model provides a battery, relate to lithium cell technical field, in order to solve the packaging method who adopts among the correlation technique, the space utilization who easily leads to the battery inside is less, the lower problem of the energy density of battery, the battery includes the casing, electric core body and lid subassembly, the casing has the cavity, electric core body is arranged in the cavity, electric core body's both ends are provided with first utmost point ear and the second utmost point ear opposite with first utmost point ear polarity respectively, lid subassembly includes utmost point post and lid body, lid body and casing are connected, utmost point post passes through hot melt adhesive spare with lid body and insulates and is connected, utmost point post is connected with first utmost point ear electricity, second utmost point ear is connected with the casing electricity, the battery that this application provided, can increase the inner space of battery, thereby effectively improve the inside space utilization of battery, improve the energy density of battery.

Description

Battery with a battery cell

Technical Field

The application relates to the technical field of lithium batteries, in particular to a battery.

Background

As power batteries are widely used, and in particular, lithium ion batteries are widely used, and the demand for small and high-energy lithium ion batteries is also wide, so that it is a major problem to be solved at present to improve the internal space utilization ratio of the batteries and to increase the energy density of the batteries.

Common lithium ion battery is divided into button cell, cylindrical battery and square battery according to the appearance, and taking cylindrical battery as an example, cylindrical battery mainly includes battery shell, electric core body, top cap and bottom, and electric core body is arranged in battery shell's cavity, and top cap and bottom lock are at battery shell's relative both ends respectively to encapsulation battery shell.

However, the above-described packaging method has a low space utilization rate inside the battery and a low energy density of the battery.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the problems mentioned in the background art, embodiments of the present application provide a battery, which can increase an internal space of the battery, thereby effectively improving a space utilization rate inside the battery and increasing an energy density of the battery.

In order to achieve the above object, an embodiment of the present application provides a battery, which includes a casing, a cell body, and a cover assembly, where the casing has a cavity, the cell body is located in the cavity,

a first tab and a second tab with the polarity opposite to that of the first tab are respectively arranged at two ends of the battery cell body;

the cover body assembly comprises a pole and a cover body, and the cover body is connected with the shell;

the pole is in insulated connection with the cover body through a hot melt adhesive part, and the pole is electrically connected with the first pole lug;

the second tab is electrically connected with the housing.

In the above battery, optionally, the cover assembly further includes a plastic part;

the plastic part is connected on the end face of the cover body close to one side of the cavity.

In the above battery, optionally, the battery further comprises a sealing sheet;

the pole column is provided with a first liquid injection hole, the first liquid injection hole penetrates through the pole column, the sealing sheet is arranged on the pole column, and the sealing sheet encapsulates the first liquid injection hole;

the battery further comprises an insulating glue layer, and the insulating glue layer is coated on the outer peripheral face of the shell.

In the battery above, optionally, the surface of the post protrudes beyond the surface of the sealing plate, and a height difference between the surface of the post and the surface of the sealing plate ranges from 0.5mm to no less.

In the above battery, optionally, a boss is formed on the surface of the pole, the boss is recessed inwards to form a groove, and the sealing sheet is located in the groove.

In the above battery, optionally, the boss is an annular boss, the annular boss is disposed around the outer edge of the terminal, and the annular boss is recessed inwards to form an annular groove; or the like, or, alternatively,

the lug boss is a plurality of arc sections, a plurality of the arc sections are arranged along the circumferential interval of the outer edge of the pole column, and a plurality of the arc sections are inwards sunken to form grooves.

In the above battery, optionally, the battery further includes a first current collecting plate, the first current collecting plate is provided with a first through hole, and the electric core body is provided with a central through hole;

the first liquid injection hole, the first through hole and the central through hole are communicated with each other, and overlapping parts are correspondingly arranged in the first liquid injection hole, the first through hole and the central through hole.

In the above battery, optionally, the plastic part has an annular structure, the battery cell body has a columnar structure, the outer diameter of the plastic part is greater than the outer diameter of the battery cell body, the difference between the two is not less than 0.2mm,

in the above battery, optionally, the battery further includes tab glue, the tab glue wraps the periphery of the first tab, and the outer diameter of the plastic part is greater than the outer diameter of the tab glue.

In the above battery, optionally, the plastic part includes oppositely disposed extending portions, and the extending portions extend along a direction from the cover assembly to the housing;

and the extension part surrounds and wraps the first tab and the first current collecting piece.

In the above battery, optionally, the plastic part is further provided with an annular boss, the annular boss is disposed around the hole edge of the first through hole, and a protruding direction of the annular boss faces the cover assembly;

the annular boss is located between the pole and the cover body.

According to the battery provided by the application, the cover body assembly and the shell are jointly enclosed to form the cavity, and the cavity can protect the battery cell body, so that the battery cell body is prevented from being polluted by the outside; in addition, through the arrangement of the cover body assembly, the cover body assembly is located at one end of the shell and is connected with the shell, so that compared with the related art, one cover body assembly can be reduced for packaging, packaging parts of the battery are effectively reduced, the packaging process of the battery is simplified, the internal space of the battery is increased, the internal space utilization rate of the battery is effectively improved, and the energy density of the battery is improved.

In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the batteries provided by the embodiments of the present application, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

fig. 2 is an exploded view of a battery provided in an embodiment of the present application;

fig. 3 is a cross-sectional view of a battery provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a cover assembly according to an embodiment of the present disclosure;

fig. 5 is a cross-sectional view of a cover assembly provided in an embodiment of the present application.

Description of the reference numerals:

100-a battery; 110-a housing; 111-a cavity;

120-a cell body; 130-a cover assembly; 131-pole;

132-a cover body; 133-hot melt adhesive pieces; 134-plastic part;

1341-an extension; 1342-annular boss; 140-a first current collector;

150-tab glue; 160-sealing sheet; 170-insulating glue layer.

Detailed Description

The common lithium ion battery 100 is divided into a button battery 100, a cylindrical battery 100 and a square battery 100 according to the shape, taking the cylindrical battery 100 as an example, the cylindrical battery 100 mainly includes a battery 100 casing 110 and a cell body 120, wherein the battery 100 casing 110 has a cavity 111, the cell body 120 is located in the cavity 111 of the battery 100 casing 110, a tab is provided on the cell body 120, and the tab is welded on one side of the cell body 120 close to a shell opening of the casing 110 by a welding method.

Specifically, the battery 100 includes a casing 110, a cell body 120, a top cover and a bottom cover, the casing 110 usually adopts a stainless steel shell, the top cover and the bottom cover are respectively fastened at two opposite ends of the casing 110 of the battery 100, the cell body 120 is sealed in a cavity 111 fastened to each other, wherein, in the process of specific packaging, the top cover and the bottom cover are respectively welded at two opposite ends of the casing 110 of the battery 100 in a welding manner, and the universality is strong and the application range is wide.

However, in the packaging method adopted in the related art, the top cover and the bottom cover both occupy a certain internal space of the battery 100, so that the space for accommodating the battery cell body 120 in the cavity 111 is limited, and the space utilization rate inside the battery 100 is small, thereby being not beneficial to increasing the capacity of the battery 100 and being not beneficial to increasing the energy density of the battery 100.

Therefore, in order to solve the above technical problems, the present application provides a battery 100, in which a cover assembly 130 is provided, the cover assembly 130 and a casing 110 together enclose a cavity 111, and the cavity 111 can protect a cell body 120, so as to prevent the cell body 120 from being contaminated by external environment; in addition, by providing the cover assembly 130, wherein the cover assembly 130 is located at one end of the housing 110 and is connected to the housing 110, compared with the related art, one cover assembly 130 can be omitted for packaging, so that the packaging components of the battery 100 are effectively reduced, the packaging process of the battery 100 is simplified, the internal space of the battery 100 is increased, the internal space utilization rate of the battery 100 is effectively improved, and the energy density of the battery 100 is increased.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application, fig. 2 is an exploded view of the battery provided in the embodiment of the present application, fig. 3 is a cross-sectional view of the battery provided in the embodiment of the present application, fig. 4 is a schematic structural diagram of a cover assembly provided in the embodiment of the present application, and fig. 5 is a cross-sectional view of the cover assembly provided in the embodiment of the present application.

Referring to fig. 1 to 5, an embodiment of the present application provides a battery 100, where the battery 100 includes a casing 110 and a cell body 120, the casing 110 has a cavity 111, and the cell body 120 is located in the cavity 111 (specifically, see fig. 3), and by including the cavity 111, the cavity 111 can play a role in protecting the cell body 120, so as to avoid a problem that the cell body 120 is contaminated by external pollution.

In this embodiment, two ends of the battery cell body 120 are respectively provided with a first tab and a second tab with a polarity opposite to that of the first tab, it should be noted that the battery 100 is divided into a positive electrode and a negative electrode, and the tabs are metal conductors leading the positive electrode and the negative electrode out of the battery cell body 120, and the tabs are generally divided into three materials: the positive electrode of the battery 100 is made of an aluminum material, and the negative electrode of the battery 100 is made of a copper material, or the negative electrode of the battery 100 is also made of a copper-nickel material.

Specifically, in the manufacturing process, the tab is mainly used for welding the current collecting plate by flattening to form a compact plane, and it should be noted that the flattening of the tab is a process, and may include the following steps: the ultrasonic flattening method comprises the following steps of ultrasonically flattening a positive conductive tab to a fixed depth, mechanically flattening the positive conductive tab to a process required depth, ultrasonically flattening a negative conductive tab to the fixed depth, and mechanically flattening the negative conductive tab to the process required depth, wherein the process can ensure the end surface flatness of the tab of the battery 100, so that the welding defective rate between the tab and a current collecting piece is reduced.

In this embodiment, referring to fig. 3 and 4, the cover assembly 130 may include a post 131 and a cover body 132, the post 131 is connected to an end surface of the cover body 132 away from the cavity 111, and the cover body 132 is connected to the housing 110.

In this embodiment, the terminal 131 mainly plays a role in connection and conduction, specifically, the terminal 131 refers to a component having one end directly connected to the bus bar and the other end connected to an external conductor, or connected to a first level of the adjacent single battery 100 in the battery 100 set, and different materials of the terminal 131 are different.

As shown in fig. 3 to 5, the cover assembly 130 may further include a hot melt adhesive 133, wherein the hot melt adhesive 133 is located between the post 131 and the cover body 132, and the post 131 and the cover body 132 are connected through the hot melt adhesive 133, and it should be noted that the hot melt adhesive 133 is a plastic adhesive, and its physical state changes with temperature change in a certain temperature range, and its chemical properties do not change, and it is non-toxic and odorless, and belongs to an environment-friendly chemical product.

Specifically, the hot melt adhesive member 133 is mainly PP adhesive, wherein the PP adhesive is abbreviated as Polypropylene, the chinese name is Polypropylene, commonly called "baiyi adhesive", and of course, the hot melt adhesive member 133 may also be made of other materials having the same characteristics, which is not further limited in this embodiment, in addition, the thickness range of the hot melt adhesive member 133 is not less than 0.1mm, exemplarily, the thickness of the hot melt adhesive member 133 may be 0.1mm, 0.3mm, 0.5mm, or 0.8mm, and the minimum thickness value of the hot melt adhesive member 133 is limited, so that good sealing performance between the post 131 and the cover body 132 can be achieved to the maximum extent.

Through being provided with hot melt adhesive spare 133 between utmost point post 131 and lid body 132, when being in the high temperature state, hot melt adhesive spare 133 melts under high temperature, thereby exert pressure to utmost point post 131 and lid body 132 respectively, make utmost point post 131, hot melt adhesive spare 133 and lid body 132 three glue together, cool off gradually as the temperature, hot melt adhesive spare 133 also cools off gradually, and solidification forms sealed insulation system, this mode can guarantee the leakproofness between utmost point post 131 and lid body 132 to the at utmost, and improve the steadiness of assembling between utmost point post 131 and the lid body 132.

Therefore, in the battery provided by the application, by arranging the cover assembly 130, the cover assembly 130 and the casing 110 together enclose to form the cavity 111, and the cavity 111 can play a role in protecting the battery cell body 120, so that the battery cell body 120 is prevented from being polluted by the outside; in addition, by providing the cover assembly 130, wherein the cover assembly 130 is located at one end of the housing 110 and is connected to the housing 110, compared with the related art, one cover assembly 130 can be omitted for packaging, thereby effectively reducing the packaging components of the battery, simplifying the packaging process of the battery, and increasing the internal space of the battery, thereby effectively improving the space utilization rate inside the battery and increasing the energy density of the battery

In an implementation manner, in this embodiment, as shown in fig. 3 to fig. 5, the cover assembly 130 may further include a plastic part 134, the plastic part 134 is an annular structure, the cell body 120 is a cylindrical structure, and the plastic part 134 is connected to an end surface of the cover body 132 close to the cavity 111, where an outer diameter of the plastic part 134 is larger than an outer diameter of the cell body 120, a difference range between the two is not smaller than 0.2mm, and exemplarily, the difference between the two may be 0.2mm, 0.5mm, or 0.8 mm.

It should be noted that the plastic part 134 has a certain insulation property, and the protruding portion of the plastic part 134 wraps the tab and the first current collecting plate 140, so that a short circuit phenomenon caused by direct contact between the metal strip of the tab and the metal casing 110 can be avoided, and in addition, a difference between the outer diameter of the plastic part 134 and the outer diameter of the cell body 120 is limited, so that the short circuit phenomenon can be avoided to the greatest extent.

As shown in fig. 5, the plastic part 134 includes oppositely disposed extension portions 1341, the extension portions 1341 are respectively located at two ends of the plastic part 134, the extension portions 1341 extend along a direction from the cover assembly 130 to the housing 110, and the extension portions 1341 surround and wrap the first tab and the first current collecting plate 140, so that the short circuit caused by the direct contact between the metal strips of the tabs and the metal housing 110 can be further avoided by disposing the extension portions 1341.

In an implementation manner, as shown in fig. 4, an annular boss 1342 is further disposed on the plastic part 134, the annular boss 1342 is disposed around a hole edge of the first through hole, a protruding direction of the annular boss 1342 faces the cover assembly 130, the annular boss 1342 is located between the post 131 and the cover body 132, and the annular boss 1342 is disposed, so that an insulation problem between the post 131 and the cover body 132 can be avoided.

In one implementation, referring to fig. 2, a first current collecting plate 140 may be further included, where the first current collecting plate 140 is located between the case 110 and the cover assembly 130, and it should be noted that the first current collecting plate 140 serves as an electrically conductive bridge for connecting the battery plate and the case 110 of the battery 100.

In this embodiment, the first current collecting plate 140 and the cover assembly 130 may be connected by welding or bonding with a conductive adhesive to achieve conduction and conduction therebetween, and similarly, the first current collecting plate 140 and the battery cell body 120 may also be connected by welding or bonding with a conductive adhesive to achieve conduction and conduction therebetween, so that there is no need to provide an additional adaptor plate between the first current collecting plate 140 and the cover assembly 130 for connection therebetween, the operation is simpler and more convenient, the number of packaged components is reduced, and the packaging process is simplified; in addition, the mode of welding or conductive adhesive bonding is adopted, the simplicity is realized, the reliability is good, and the connection stability is higher.

In addition, in this embodiment, as shown in fig. 2, the battery 100 may further include a tab glue 150, wherein the tab glue 150 is coated on the outer circumferential surface of the tab, and by providing the tab glue 150, on the first hand, the tab glue 150 has a certain insulation property, so that a short circuit phenomenon caused by direct contact between the metal belt and the metal case 110 can be avoided; in the second aspect, the tab glue 150 has a certain viscosity, and thus, the tab glue 150 is adhered around the outer peripheral surface of the tab, so that when the battery cell body 120 is packaged, the tab glue 150 does not have the risk of warping and falling off, the packaging stability is ensured to the maximum extent, and the battery 100 is processed and produced.

In a practical manner, referring to fig. 2 and fig. 3, the battery 100 may further include a sealing sheet 160, the sealing sheet 160 is located on a side of the cover assembly 130 away from the cavity 111, and by providing the sealing sheet 160, the sealing sheet 160 may effectively perform a sealing function, and meanwhile, the sealing sheet 160 may also perform an explosion-proof function when receiving a certain internal pressure.

It should be noted that, during assembly, a boss is formed on the surface of the pole 131, the boss is recessed inwards to form a groove, and the sealing sheet 160 is located in the groove.

The lug boss can be an annular lug boss which is arranged on the outer edge of the pole 131 in a surrounding manner, and the annular lug boss is inwards recessed to form an annular groove; or the like, or, alternatively,

the boss can be a plurality of circular arc sections, and a plurality of circular arc sections are arranged along the circumference interval of the outer fringe of utmost point post 131, and a plurality of circular arc sections are inwards sunken to be formed with the recess.

The sealing plate 160 can be assembled in the above manner, and of course, in this embodiment, including but not limited to the above manner, as long as the sealing plate 160 can achieve the sealing and explosion-proof functions, all belong to the protection scope of the present application.

Specifically, seted up first notes liquid hole on lid subassembly 130's utmost point post 131, along sealing gasket 160 to lid subassembly 130's direction, first notes liquid hole runs through utmost point post 131, and sealing gasket 160 sets up on utmost point post 131, and the first notes liquid hole of sealing gasket 160 encapsulation, like this, can effectively avoid outside impurity to enter into to cavity 111 through first notes liquid hole.

Specifically, the surface of the post 131 protrudes out of the surface of the sealing plate 160, and the height difference range between the surface of the post 131 and the surface of the sealing plate 160 is not less than 0.5mm, so that the battery 100 can avoid the problem that the sealing plate 160 collides with other objects to cause sealing failure or scratch the sealing plate 160 in the subsequent processing process, thereby ensuring good sealing performance of the sealing plate 160 to the maximum extent; in addition, after the encapsulation is completed, the battery cell body 120 is in an interference compression state in the cavity 111, so that the battery cell body 120 can be better prevented from moving in the cavity 111, and the reliability of the battery 100 is improved to the greatest extent.

In addition, battery 100 still includes insulating glue layer 170, and insulating glue layer 170 cladding is on the outer peripheral face of casing 110, and through setting up insulating glue layer 170, insulating glue layer 170 has certain insulating nature to can avoid appearing electrically conductive and short circuit's phenomenon, improve the security performance of product, guarantee user's use in the at utmost and experience.

In an implementation manner, the first collecting plate 140 is provided with a first through hole, the electric core body 120 is provided with a central through hole, and the first injection hole, the central through hole and the second injection hole are communicated with each other, so that the electrolyte can be injected into the cavity 111 through the first injection hole, the central through hole and the second injection hole in sequence.

Specifically, the aperture of the first through hole is smaller than that of the second liquid injection hole, so that the problem that the electrode plate is deformed in a layered mode due to the fact that electrolyte directly hits the electrode plate when the electrolyte is injected can be solved; in addition, the aperture of the first electrolyte injection hole is larger than that of the second electrolyte injection hole, so that the first current collecting plate 140 and the cell body 120 can be welded through the first electrolyte injection hole while injecting the electrolyte. It should be noted that the first fluid injection hole, the first through hole, and the central through hole may be correspondingly provided with overlapping portions, so as to facilitate welding between the post 131, the first current collecting plate 140, and the cell body 120.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, as used herein, indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the position or element so referred to must have a particular orientation, be of particular construction and operation, and thus should not be considered as limiting.

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 application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixedly connected, detachably connected, or integral to one another; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (12)

1. The battery is characterized by comprising a shell, a cell body and a cover body assembly, wherein the shell is provided with a cavity, and the cell body is positioned in the cavity;

a first lug and a second lug with the polarity opposite to that of the first lug are respectively arranged at two ends of the battery cell body;

the cover body assembly comprises a pole and a cover body, and the cover body is connected with the shell;

the pole is in insulated connection with the cover body through a hot melt adhesive part, and the pole is electrically connected with the first pole lug;

the second tab is electrically connected with the housing.

2. The battery of claim 1, wherein the cover assembly further comprises a plastic member;

the plastic part is connected on the end face of the cover body close to one side of the cavity.

3. The battery of claim 2, further comprising a sealing plate;

the utility model discloses a seal structure, including utmost point post, sealing piece, the first liquid hole of annotating has been seted up on the utmost point post, first liquid hole of annotating runs through the utmost point post, the sealing piece is connected on the utmost point post, the sealing piece encapsulation first liquid hole of annotating.

4. The battery of claim 3, further comprising a layer of insulating glue that wraps around the outer peripheral surface of the housing.

5. The battery according to claim 4, wherein the surface of the post protrudes from the surface of the sealing plate, and the range of height difference between the surface of the post and the surface of the sealing plate is not less than 0.5 mm.

6. The battery of claim 5, wherein the surface of the pole is formed with a boss recessed inward to form a groove, and the sealing plate is located in the groove.

7. The battery of claim 6, wherein the boss is an annular boss which is arranged around the outer edge of the pole, and the annular boss is recessed inwards to form an annular groove; or the like, or, alternatively,

the lug boss is a plurality of circular arc sections, the circular arc sections are arranged at intervals along the circumferential direction of the outer edge of the pole, and the circular arc sections are inwards sunken to form the grooves.

8. The battery of any one of claims 3-7, further comprising a first current collector, wherein the first current collector is provided with a first through hole, and the cell body is provided with a central through hole;

the first liquid injection hole, the first through hole and the central through hole are communicated with each other, and overlapping parts are correspondingly arranged in the first liquid injection hole, the first through hole and the central through hole.

9. The battery of any one of claims 2-7, wherein the plastic part is of an annular structure, and the cell body is of a cylindrical structure;

the outer diameter of the plastic part is larger than that of the battery cell body, and the difference range between the outer diameter of the plastic part and the outer diameter of the battery cell body is not smaller than 0.2 mm.

10. The battery of any of claims 2-7, further comprising a tab glue wrapped around the outer perimeter of the first tab, wherein the plastic part has an outer diameter greater than the outer diameter of the tab glue.

11. The battery of claim 8, wherein the plastic member comprises oppositely disposed extensions extending in a direction from the cover assembly to the housing;

and the extension part surrounds and wraps the first tab and the first current collecting piece.

12. The battery of claim 11, wherein the plastic member is further provided with an annular boss, the annular boss surrounds the hole edge of the first through hole, and the protruding direction of the annular boss faces the cover assembly;

the annular boss is located between the pole and the cover body.

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