CN215988886U

CN215988886U - Battery with a battery cell

Info

Publication number: CN215988886U
Application number: CN202122193497.1U
Authority: CN
Inventors: 王智峰; 彭宁
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-03-08
Anticipated expiration: 2031-09-10

Abstract

The utility model provides a battery, relates to the technical field of batteries, and aims to solve the technical problem that an existing button battery is not firm in welding. The battery comprises a shell and a top cover assembly, wherein the shell and the top cover assembly jointly enclose an accommodating cavity, and an electrode assembly is arranged in the accommodating cavity; the housing comprises a bottom wall and a side wall which are connected with each other; the bottom wall is provided with a liquid injection port which is communicated with the accommodating cavity and the outside; the electrode assembly is provided with a first tab, and the first tab is welded with the bottom wall and is formed with a first welding mark; a first insulating piece is arranged between the first tab and the bottom wall, and the first insulating piece covers a part of the first tab; the distance between the first welding mark and the first insulating piece is smaller than the distance between the first welding mark and the edge of the liquid injection port. The utility model can improve the welding performance between the first tab and the bottom wall and improve the service performance of the battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

The button cell is also called a battery, and refers to a battery with the overall dimension like a small button, generally speaking, the battery has a larger diameter and a thinner thickness, and the button cell is divided from the appearance, and the button cell includes a cylindrical cell, a square cell, a special-shaped cell and the like.

Current button cell includes casing and electric core, and the casing has the holding chamber, and electric core is located the holding intracavity. The top of casing is provided with the top cap, and one side that the holding chamber was kept away from to the top cap is provided with electrically conductive, has the boss on electrically conductive, and the boss passes the through-hole on the top cap, is provided with the insulating cement between electrically conductive and the top cap. In addition, the casing includes lateral wall and diapire, and the anodal ear and the electrically conductive welding of leading of electric core, negative pole ear and diapire welding. The bottom wall is provided with a liquid filling opening which is sealed by a sealing piece.

However, the button cell has the problem of weak welding, which affects the use performance of the button cell.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the problems mentioned in the background art, the present invention provides a battery capable of improving the welding performance between the first tab and the bottom wall and improving the service performance of the battery.

In order to achieve the above object, the present invention provides a battery, which includes a case and a cap assembly, wherein the case and the cap assembly jointly enclose an accommodating cavity, and an electrode assembly is disposed in the accommodating cavity; the housing includes a bottom wall and a side wall that are connected to each other.

Be provided with on the diapire and annotate the liquid mouth, it communicates to annotate the liquid mouth holding chamber and outside.

The electrode assembly is provided with a first tab, and the first tab is welded with the bottom wall and is formed with a first welding mark; first utmost point ear with be provided with first insulating part between the diapire, first insulating part covers part first utmost point ear.

The distance between the first welding mark and the first insulating piece is smaller than the distance between the first welding mark and the edge of the liquid injection port.

According to the battery provided by the utility model, the first insulating piece is arranged between the first pole lug and the bottom wall, so that the first insulating piece covers a part of the first pole lug, and the insulation between the non-connection part of the first pole lug and the bottom wall can be kept. The first welding mark is formed by welding the first tab and the bottom wall, so that the first tab and the bottom wall can be stably connected. Make the distance of first welding seal and first insulating part be less than the first distance of welding the seal and annotating the liquid mouth, on the one hand, make first welding seal and annotate and have certain distance between the liquid mouth, prevent that first welding seal welding from annotating liquid mouth department, not only avoid annotating the first connection of welding the seal of liquid mouth influence, avoid first welding seal influence moreover and annotate the notes liquid of liquid mouth department. On the other hand, a certain distance is reserved between the first welding mark and the first insulating piece, and the first insulating piece is prevented from influencing the welding effect between the first tab and the bottom wall. The arrangement improves the welding performance between the first tab and the bottom wall, and improves the use stability of the battery.

In one possible embodiment, the distance between the first solder mark and the first insulating member and the distance between the first solder mark and the edge of the liquid pouring opening have a difference value, and the difference value is less than or equal to 2 mm.

In one possible embodiment, the first tab has a bent portion and a connecting portion connected to each other, the bent portion being located inside the electrode assembly, and the connecting portion being located between an end of the electrode assembly and the bottom wall.

In one possible embodiment, the length of the connection part is less than the radius of the electrode assembly.

In one possible embodiment, a distance is provided between the end of the connecting part and the edge of the liquid pouring opening, and the length of the distance is less than or equal to 1.5 mm.

In one possible embodiment, an annular insulating member having an inner diameter larger than the diameter of the liquid injection port is provided between the first tab and the electrode assembly.

The outer diameter of the annular insulating part is smaller than that of the electrode assembly, and the bending part is located on the outer side of the annular insulating part.

In an embodiment, the first insulating member covers at least a part of the connecting portion and at least a part of the bent portion.

And a second insulating piece is arranged on one side, close to the electrode assembly, of the first tab, and the covering surfaces of the second insulating piece and the first insulating piece are overlapped.

In one possible implementation, the top cover assembly includes a top cover and a conductive member, the top cover is connected to the side wall of the housing, the conductive member is located on one side of the top cover close to the accommodating cavity, a through hole is formed in the top cover, and at least part of the conductive member is located in the through hole; the conductive piece is connected with the top cover in an insulating mode, one end, close to the top cover, of the electrode assembly is provided with a second tab, and the second tab is electrically connected with the conductive piece.

The first lug has a first projection on the bottom wall, the second lug has a second projection on the bottom wall, an included angle is formed between the central line of the first projection and the central line of the second projection, and the included angle range is 60-120 degrees.

In an achievable embodiment, the second tab is welded with the conductive piece and is formed with a second welding print; the orthographic projection of the first welding mark on the bottom wall and the orthographic projection of the second welding mark on the bottom wall are not coincident with each other.

In one possible embodiment, the width of the second tab and the first tab ranges from 2 to 4mm, and the width of the first insulator is 0.05 to 0.1mm greater than the width of the second tab and the first tab.

The construction and other objects and advantages of the present invention will be more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention at a first viewing angle;

fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the utility model at a second viewing angle;

fig. 3 is an exploded view of a battery provided in an embodiment of the present invention;

fig. 4 is a schematic diagram of an internal structure of a battery according to an embodiment of the present invention;

fig. 5 is a schematic view of a partial structure of a battery according to an embodiment of the present invention;

fig. 6 is a schematic structural view of an electrode assembly of a battery according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the arrangement of a first electrode and a second electrode of a cell provided in an embodiment of the present invention;

fig. 8 is a schematic structural view of a second tab and cap assembly of a battery according to an embodiment of the present invention.

Description of reference numerals:

100-a battery;

10-a housing;

11-a bottom wall;

12-a side wall;

13-liquid injection port;

14-counter bore;

15-first solder printing;

20-a cap assembly;

21-a top cover;

211-a through hole;

22-a conductive member;

221-a bump;

222-second solder print;

23-an insulating adhesive;

30-an accommodating cavity;

40-an electrode assembly;

41-a first tab;

41 a-first projection;

411-a connecting part;

412-bending part;

42-a second tab;

42 a-second projection;

50-a first insulator;

60-ring-shaped insulator;

70-a second insulator;

80-a closure.

Detailed Description

As described in the background art, the liquid injection port in the related art is disposed on the bottom wall, and the negative tab is welded to the bottom wall to form a weld mark. However, because the welding position is too close to annotate the liquid mouth, annotate the liquid mouth department on the one hand and do not have solid structure, lead to the negative pole ear to weld empty in annotating liquid mouth department, influence the welding stability of negative pole ear and diapire, and then influence button cell's stability in use. On the other hand, the welding mark is positioned near the liquid injection port, so that the injection of the electrolyte is influenced.

The utility model provides a battery, which can keep insulation between the non-connection part of a first tab and a bottom wall by arranging the first insulating piece between the first tab and the bottom wall and enabling the first insulating piece to cover part of the first tab. The first welding mark is formed by welding the first tab and the bottom wall, so that the first tab and the bottom wall can be stably connected. Make the distance of first welding seal and first insulating part be less than the first distance of welding the seal and annotating the liquid mouth, on the one hand, make first welding seal and annotate and have certain distance between the liquid mouth, prevent that first welding seal welding from annotating liquid mouth department, not only avoid annotating the first connection of welding the seal of liquid mouth influence, avoid first welding seal influence moreover and annotate the notes liquid of liquid mouth department. On the other hand, a certain distance is reserved between the first welding mark and the first insulating piece, and the first insulating piece is prevented from influencing the welding effect between the first tab and the bottom wall. The arrangement improves the welding performance between the first tab and the bottom wall, and improves the use stability of the battery.

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the utility model. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model. 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 invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention at a first viewing angle. Fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the utility model under a second viewing angle. Fig. 3 is an exploded view of a battery according to an embodiment of the present invention. Fig. 4 is a schematic diagram of an internal structure of a battery according to an embodiment of the present invention. Fig. 5 is a schematic view of a partial structure of a battery according to an embodiment of the present invention. Fig. 6 is a schematic structural view of an electrode assembly of a battery according to an embodiment of the present invention. Fig. 7 is a schematic arrangement diagram of a first electrode and a second electrode of a battery provided in an embodiment of the present invention. Fig. 8 is a schematic structural view of a second tab and cap assembly of a battery according to an embodiment of the present invention. Referring to fig. 1 to 8, the present invention provides a battery.

Referring to fig. 3 and 5, the battery 100 includes a case 10 and a cap assembly 20, the case 10 and the cap assembly 20 together define a receiving chamber 30, and an electrode assembly 40 is disposed in the receiving chamber 30. It is understood that the housing 10 may be a stainless steel housing. The housing 10 includes a bottom wall 11 and a side wall 12 connected to each other, the side wall 12 is enclosed on the bottom wall 11 and is close to one side of the top cover 21, and the side wall 12 and the bottom wall 11 may be integrally formed. Be provided with on the diapire 11 and annotate liquid mouth 13, annotate liquid mouth 13 intercommunication holding chamber 30 and outside, like this, can annotate the electrolyte into holding chamber 30 through annotating liquid mouth 13.

In addition, the battery 100 further includes a sealing member 80, and the sealing member 80 may be used to seal the pouring outlet 13. The sealing member 80 is located on the side of the bottom wall 11 away from the accommodating cavity 30, which facilitates welding of the sealing member 80 and the bottom wall 11 of the casing 10, and improves the sealing performance at the liquid filling port 13.

Specifically, the electrode assembly 40 has a first tab 41, and the first tab 41 is welded to the bottom wall 11 and is formed with a circle of first welding marks 15, so that the first tab 41 can be firmly connected to the bottom wall 11, and the electrical connection stability between the first tab and the bottom wall is ensured. A first insulator 50 is disposed between the first tab 41 and the bottom wall 11, and the first insulator 50 covers a portion of the first tab 41, so that insulation can be maintained between the non-connected portion of the first tab 41 and the bottom wall 11. Illustratively, the first insulator 50 may be tab glue.

As shown in fig. 5, the first solder mark 15 and the first insulating member 50 have a first distance L1 therebetween, the first solder mark 15 and the edge of the liquid pouring outlet 13 have a second distance L2 therebetween, and the first distance L1 is smaller than the second distance L2. Thus, on the one hand, the first welding mark 15 is prevented from being welded at the liquid injection port 13, so that the first welding mark 15 is prevented from influencing the connection of the first welding mark 15, the first welding mark 15 is positioned on the solid structure of the bottom wall 11, the welding stability of the first tab 41 and the bottom wall 11 is improved, and in addition, the first welding mark 15 is prevented from influencing the injection at the liquid injection port 13. On the other hand, the first insulator 50 is prevented from affecting the welding effect between the first tab 41 and the bottom wall 11. Thus, the welding performance between the first tab 41 and the bottom wall 11 is improved, and the stability of the battery 100 in use is improved.

It should be noted that the battery 100 provided in the embodiment of the present invention may be applied to electronic products such as a bluetooth headset, a bluetooth sound, a sports watch, a computer motherboard, an electronic dictionary, an electric toy, and a remote controller. The shape of the battery 100 may be a cylindrical battery, a rectangular battery, a special-shaped battery, or the like, and the shape of the battery 100 is not limited in the embodiment of the present invention, and the embodiment of the present invention is described by taking a cylindrical battery as an example.

In one possible embodiment, the distance between the first solder print 15 and the first insulating element 50 and the distance between the first solder print 15 and the edge of the pouring opening 13 have a difference of 2mm or less, wherein the difference may be 0.1mm, 0.5mm, 1mm, 1.5mm or 2 mm. It will be appreciated that the sealing member 80 and the bottom wall 11 are welded together with a third welding mark (not shown), and when the difference is within the above range, the first welding mark 15 and the third welding mark are ensured not to be affected by each other, so as to improve the welding stability of the first tab 41, the sealing member 80 and the bottom wall 11.

In one possible embodiment, as shown in fig. 4 and 6, the first tab 41 has a bent portion 412 and a connecting portion 411 connected to each other, the bent portion 412 is located inside the electrode assembly 40, specifically, may be located between a pole piece and a separator, and connected to the pole piece of the electrode assembly 40, the connecting portion 411 is located between an end of the electrode assembly 40 and the bottom wall 11, and the connecting portion 411 is used for welding to the bottom wall 11.

Specifically, the top cover assembly 20 includes a top cover 21 and a conductive member 22, the top cover 21 is connected to the side wall 12 of the housing 1, the conductive member 22 is located on a side of the top cover 21 close to the accommodating cavity 30, a through hole 211 is formed in the top cover 21, and at least a part of the conductive member 22 is located in the through hole 211. The conductive member 22 is insulated from the top cap 21, and a second tab 42 is disposed at an end of the electrode assembly 40 near the top cap 21, wherein the second tab 42 is electrically connected to the conductive member 22. By providing the conductive member 22, the conductive member 22 can be electrically connected to the second tab 42 and to the external electrode through the conductive member 22.

It is understood that the first tab 41 and the second tab 42 may have the same structure or different structures, and in the embodiment of the present invention, the structures of the two are the same, and only the structure of the first tab 41 is taken as an example for description.

In one possible embodiment, the conductive member 22 has a protrusion 221 on a side away from the receiving cavity 30, and the protrusion 221 penetrates through the through hole 211. Thus, the conductive member 22 can be electrically connected to the external electrode through the protrusion 221, and it can be understood that insulation should be maintained between the sidewall 12 of the protrusion 221 and the edge of the through hole 211, and in particular, a gap may be formed between the sidewall 12 of the protrusion 221 and the edge of the through hole 211 so that the two are not in contact. On the other hand, an insulating member may be provided between the sidewall 12 of the protrusion 221 and the edge of the through-hole 211.

Specifically, an insulating adhesive member 23 may be disposed between the conductive member 22 and the top cover 21. Thus, the conductive member 22 and the top cover 21 can be tightly bonded, not only having an insulating function. Illustratively, the insulating adhesive may be a thermosetting adhesive or a thermoplastic adhesive. The present invention does not limit the kind of the insulating adhesive member.

Specifically, the electrode assembly 40 has a cylindrical shape, and the length of the connecting portion 411 is smaller than the radius of the electrode assembly 40, and it can be understood that the liquid inlet 13 is located at the center of the bottom wall 11, and the center of the bottom wall 11 coincides with the center of the electrode assembly 40. Since the bent portion 412 of the first tab 41 is located inside the electrode assembly 40 and the connecting portion 411 extends from the bent portion 412 to the center of the electrode assembly 40, the length of the connecting portion 411 is smaller than the radius of the electrode assembly 40, so that the connecting portion 411 of the first tab 41 can be prevented from blocking the electrolyte injection port 13, and the electrolyte injection is prevented from being affected.

In one possible embodiment, as shown in fig. 5, a distance L3 is provided between the end of the connecting portion 411 and the edge of the liquid injection port 13, and the length of the distance L3 is 1.5mm or less, wherein the length of the distance L3 is within the above range, and the connecting portion 411 of the first tab 41 can be ensured to have a sufficient length to facilitate the welding of the first tab 41 to the bottom wall 11.

In one possible embodiment, an annular insulator 60 is disposed between the first tab 41 and the electrode assembly 40, and the annular insulator 60 keeps the first tab 41 and the electrode assembly 40 insulated from each other, so that short circuits are less likely to occur. The annular insulating member 60 may be an insulating adhesive paper, an insulating plastic, or the like. Wherein the inner diameter of the annular insulating member 60 is larger than the diameter of the liquid pouring port 13, so that the annular insulating member 60 can be prevented from blocking the pouring of the electrolyte. The annular insulator 60 has an outer diameter smaller than that of the electrode assembly 40, and the bent portion 412 is located outside the annular insulator 60, so that the annular insulator 60 and the first tab 41 can be prevented from interfering with each other.

It is understood that the second tab 42 and the electrode assembly 40 may be provided with the ring-shaped insulator 60, and the present embodiment will not be described herein.

In one possible embodiment, as shown in fig. 5 and 6, the first insulating member 50 covers at least a part of the connecting portion 411 and at least a part of the bent portion 412. A second insulator 70 is provided at a side of the first tab 41 adjacent to the electrode assembly 40, and the covering surfaces of the second insulator 70 and the first insulator 50 coincide. Wherein the first insulating member 50 and the second insulating member 70 are adapted in shape. In this way, the first insulator 50 and the second insulator 70 may be positioned at both sides of the first tab 41 to prevent the first tab 41 from being short-circuited.

It is understood that the second tab 42 may also be covered with the first insulating member 50 and the second insulating member 70, and the description of the embodiment is omitted here.

As shown in fig. 7, the first tab 41 has a first projection 41a on the bottom wall 11, the second tab 42 has a second projection 42a on the bottom wall 11, and an included angle α is formed between a center line of the first projection 41a and a center line of the second projection 42a, and the included angle α ranges from 60 ° to 120 °. In particular, the angle α may be 60 °, 70 °, 90 °, 110 ° or 120 °, preferably 90 °. The arrangement positions of the first tab 41 and the second tab 42 on the pole pieces before winding are relatively fixed, so that the arrangement difficulty of the first tab 41 and the second tab 42 can be reduced when the included angle alpha between the first tab 41 and the second tab 42 after winding is within the range, wherein the arrangement difficulty is the lowest when the included angle alpha between the first tab 41 and the second tab is 90 degrees.

It should be noted that the first tab 41 and the second tab 42 have a fixed angle, so that the bottom wall 11 and the first tab 41 can be easily welded. Since the bottom wall 11 and the first tab 41 need to be welded from the outside after the electrode assembly 40 is installed in the receiving cavity 30, however, the specific position of the first tab 41 cannot be visually recognized, and therefore, by judging the angle and position of the second tab 42, the angle and position of the first tab 41 can be deduced.

In one possible embodiment, as shown in fig. 8, the second tab 42 is welded to the conductive member 22 and is formed with a second weld mark 222, the second weld mark 222 and the protrusion 221 are located on opposite sides of the conductive member 22, an orthogonal projection of the second weld mark 222 on the bottom wall 11 coincides with an orthogonal projection of the liquid injection port 13 on the bottom wall 11, and an orthogonal projection of the first weld mark 15 on the bottom wall 11 does not coincide with an orthogonal projection of the second weld mark 222 on the bottom wall 11. In this way, the arrangement of the first solder marks 15 can be made more regular.

In one possible embodiment, the width of the second tab 42 and the first tab 41 ranges from 2 to 4mm, wherein the width may be 2mm, 3mm, 3.5mm or 4 mm. When the width is greater than 4mm, the first tab 41 and the second tab 42 occupy too much space inside the accommodating cavity 30, which not only wastes materials, but also increases the difficulty of installation. When the width is less than 2mm, it is inconvenient to weld the first tab 41 to the bottom wall 11, and the second tab 42 to the conductive member 22.

The width of the first insulator 50 is 0.05-0.1mm greater than the width of the second tab 42 and the first tab 41. Wherein the value may be 0.05mm, 0.08mm or 0.1 mm. When the value is more than 0.1mm, the width of the first insulating member 50 is too large, and material is easily wasted. When the value is less than 0.05mm, the second tab 42 or the first tab 41 is easily partially exposed when there is an assembly deviation, and there is a risk of a short circuit.

It should be noted that, as shown in fig. 5, a counter bore 14 may be provided on the side of the bottom wall 11 away from the accommodating chamber 30, the liquid injection port 13 is located in the counter bore 14, and the sealing member 80 may be attached to an inner wall surface of the counter bore 14. The counter bore 14 is provided to form a receiving area on the bottom wall 11 for receiving the sealing member 80, so that the overall height of the case 10 is not increased after welding the sealing member 80, and the electrode assembly 40 can occupy the largest space in a limited space, which is advantageous for improving the energy density of the battery 100.

In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements, unless expressly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may 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 invention.

Claims

1. The battery is characterized by comprising a shell and a top cover assembly, wherein the shell and the top cover assembly jointly enclose an accommodating cavity, and an electrode assembly is arranged in the accommodating cavity; the housing comprises a bottom wall and a side wall which are connected with each other;

the bottom wall is provided with a liquid injection port which is communicated with the accommodating cavity and the outside;

the electrode assembly is provided with a first tab, and the first tab is welded with the bottom wall and is formed with a first welding mark; a first insulating piece is arranged between the first tab and the bottom wall, and the first insulating piece covers a part of the first tab;

2. The battery of claim 1, wherein a distance between the first solder mark and the first insulating member and a distance between the first solder mark and the edge of the liquid pouring port have a difference of 2mm or less.

3. The battery according to claim 2, wherein the first tab has a bent portion and a connecting portion connected to each other, the bent portion being located inside the electrode assembly, the connecting portion being located between an end of the electrode assembly and the bottom wall.

4. The battery according to claim 3, wherein the connection part has a length smaller than a radius of the electrode assembly.

5. The battery according to claim 4, wherein a space is provided between an end portion of the connecting portion and an edge of the liquid pouring port, and a length of the space is 1.5mm or less.

6. The battery according to claim 3, wherein an annular insulating member is provided between the first tab and the electrode assembly, the annular insulating member having an inner diameter larger than a diameter of the liquid injection port;

7. The battery of claim 3, wherein the first insulating member covers at least a portion of the connecting portion and at least a portion of the bent portion;

8. The battery of any of claims 1-7, wherein the cap assembly comprises a cap and a conductive member, the cap is coupled to the side wall of the housing, the conductive member is located on a side of the cap adjacent to the receiving cavity, the cap has a through hole therein, and at least a portion of the conductive member is located in the through hole; the conductive piece is connected with the top cover in an insulating mode, one end, close to the top cover, of the electrode assembly is provided with a second tab, and the second tab is electrically connected with the conductive piece;

9. The battery of claim 8, wherein the second tab is welded to the conductive member and is formed with a second weld; the orthographic projection of the first welding mark on the bottom wall and the orthographic projection of the second welding mark on the bottom wall are not coincident with each other.

10. The battery of claim 8, wherein the width of the second tab and the first tab ranges from 2 to 4mm, and the width of the first insulator is 0.05 to 0.1mm greater than the width of the second tab and the first tab.