CN216120498U - Battery with a battery cell - Google Patents

Abstract

The utility model provides a battery, relates to the technical field of batteries, and aims to solve the technical problem that the existing button battery is low in welding yield at a liquid injection port. The bottom wall is provided with a liquid injection port which is communicated with the accommodating cavity and the outside; the battery also comprises a sealing piece, the sealing piece covers the liquid injection port, the sealing piece and the bottom wall are welded to form a circle of first welding mark, and the first welding mark is arranged on the periphery of the liquid injection port in a winding mode; the electrode assembly is provided with a first tab, the first tab is welded with the bottom wall and forms a second welding mark, and the first welding mark and the second welding mark are both positioned on one side, away from the accommodating cavity, of the bottom wall; the second weld impression is not coincident with the first weld impression. The utility model can ensure that the welding at the liquid injection port of the battery is firmer, and improve the welding yield at the liquid injection port, thereby improving the yield 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 external dimension like a small button, generally speaking, the diameter is large, the thickness is thin, the button cell is classified from the external aspect, and the equivalent corresponding batteries are classified into a cylindrical battery, a square battery, a special-shaped battery and the like.

The button cell comprises a housing with an accommodating chamber and an electrode assembly located in the accommodating chamber. The top of casing is provided with the ring top cap, and the one side that the holding chamber was kept away from to the ring top cap is provided with the sheetmetal, has the boss on the sheetmetal, and the boss passes the hole of ring top cap, and towards the holding chamber, is provided with the insulating cement between sheetmetal and the ring top cap, and electrode assembly's first utmost point ear is connected with the sheetmetal electricity, and second utmost point ear is connected with the casing. In addition, a liquid injection port is arranged on the boss and is sealed by a sealing piece.

However, the welding yield of the current button battery at the liquid injection port is low.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the background art, the utility model provides a battery, which can enable the welding at a liquid injection port of the battery to be firmer, and improve the welding yield at the liquid injection port, thereby improving the yield of the battery.

In order to achieve the above object, the present invention provides a battery including a case and a cap assembly, the case and the cap assembly together enclosing an accommodation chamber, and an electrode assembly disposed in the accommodation chamber. 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 battery further comprises a sealing piece, wherein the sealing piece covers the liquid injection port, the sealing piece is welded with the bottom wall to form a circle of first welding seal, and the first welding seal is arranged around the periphery of the liquid injection port.

The electrode assembly is provided with a first tab, the first tab is welded with the bottom wall and forms a second welding mark, and the first welding mark and the second welding mark are both positioned on one side, away from the accommodating cavity, of the bottom wall; the second weld impression is not coincident with the first weld impression.

According to the battery provided by the utility model, the shell and the top cover assembly are arranged to form the accommodating cavity, the electrode assembly is placed in the accommodating cavity, the liquid injection port is arranged on the bottom wall, and the liquid injection port is sealed by the sealing piece, so that on one hand, electrolyte can be injected into the accommodating cavity through the liquid injection port, and on the other hand, the sealing piece can be welded with the bottom wall of the steel shell, so that the sealing piece and the bottom wall can be welded conveniently, the welding is firmer, and the welding tightness is good. By having the first and second weld impressions misaligned, the first and second weld impressions are prevented from interacting. The welding yield of annotating liquid mouth department has been improved to above-mentioned setting, has promoted the battery yield.

In one possible embodiment, the distance between the second weld and the liquid inlet is smaller than the distance between the second weld and the edge of the bottom wall.

In one possible embodiment, the second solder print has a solder bump thereon, the height of the solder bump being no greater than 0.05 mm.

In an implementation manner, a counter bore is formed in one side, away from the accommodating cavity, of the bottom wall, the liquid injection port is located in the counter bore, and the sealing piece is attached to at least part of the inner wall surface of the counter bore.

In one possible embodiment, the diameter of the pouring opening is in the range of 1.0 to 1.5 mm.

In one realized embodiment, the counter bore is columnar, and the diameter of the counter bore ranges from 1.5mm to 3 mm;

and/or the depth range of the counter bore is 0.05-0.15 mm;

and/or the diameter range of the sealing piece is 1.5-3 mm;

and/or the thickness of the sealing piece ranges from 0.05mm to 0.15 mm.

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, at least a part of the conductive member is located in the through hole, and the conductive member is connected to the top cover in an insulating manner;

and one end of the electrode assembly, which is close to the top cover, is provided with a second tab, and the second tab is welded with the conductive piece to form a third welding mark.

In an implementation manner, a boss is arranged on one side of the conductive piece away from the accommodating cavity, and the boss penetrates through the through hole.

In an embodiment, at least a partial orthographic projection of the third solder print on the bottom wall coincides with an orthographic projection of the first solder print on the bottom wall.

In one possible embodiment, a first insulating member is disposed between the conductive member and the top cover.

And/or a second insulator is arranged between the first electrode lug and the electrode assembly and between the second electrode lug and the electrode assembly.

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;

fig. 2 is a schematic diagram of an internal structure of a battery according to an embodiment of the present invention;

fig. 3 is a partial schematic structural view of a bottom wall, a sealing member and a first tab of a battery according to an embodiment of the utility model;

fig. 4 is a schematic structural diagram of a top cap assembly of a battery according to an embodiment of the present invention at a first viewing angle;

fig. 5 is a schematic structural diagram of a top cap assembly of a battery according to an embodiment of the present invention at a second viewing angle;

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

fig. 7 is a schematic structural view of a cap assembly and a first tab of a battery according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a bottom wall of a battery according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an electrode assembly, a second tab and a second insulator 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;

16-second welding print;

17-third welding print;

20-a cap assembly;

21-a top cover;

211-a through hole;

212-a boss;

22-a conductive member;

221-a boss;

30-an accommodating cavity;

40-an electrode assembly;

41-a first tab;

42-a second tab;

50-a closure;

60-a first insulator;

70-second insulator.

Detailed Description

As described in the background art, the electrolyte injection port in the related art is disposed on the boss of the metal sheet, and the metal sheet is electrically connected to not only the first tab of the electrode assembly but also the external electrode, so the metal sheet is generally made of metal with better conductivity, such as aluminum or aluminum alloy, however, after the electrolyte injection of the battery is completed, the electrolyte injection port needs to be welded and sealed by using the sealing member, and due to the poor welding performance of the metal sheet, the welding yield of the sealing member and the metal sheet is low, which not only affects the sealing performance of the electrolyte injection port, but also reduces the yield of the button battery.

The utility model provides a battery, which is characterized in that a shell and a top cover assembly are arranged, so that the shell and the top cover assembly can enclose an accommodating cavity, an electrode assembly is placed in the accommodating cavity, a liquid injection port is arranged on a bottom wall, and the liquid injection port is sealed by a sealing piece, so that on one hand, electrolyte can be injected into the accommodating cavity through the liquid injection port, and on the other hand, the sealing piece can be welded with the bottom wall of a steel shell, so that the sealing piece and the bottom wall can be welded conveniently, the welding is firmer, and the welding tightness is good. By having the first and second weld impressions misaligned, the first and second weld impressions are prevented from interacting. The welding yield of annotating liquid mouth department has been improved to above-mentioned setting, has promoted the battery yield.

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. Fig. 2 is a schematic diagram of an internal structure of a battery according to an embodiment of the present invention. Fig. 3 is a partial structural schematic view of the bottom wall, the sealing member and the first tab of the battery according to the embodiment of the utility model. Fig. 4 is a schematic structural diagram of a top cap assembly of a battery according to an embodiment of the present invention at a first viewing angle. Fig. 5 is a schematic structural diagram of a top cap assembly of a battery according to an embodiment of the present invention at a second viewing angle. Fig. 6 is a partial structural schematic view of a top cap assembly of a battery according to an embodiment of the present invention. Fig. 7 is a schematic structural view of a cap assembly and a first tab of a battery according to an embodiment of the present invention. Fig. 8 is a schematic structural view of a bottom wall of a battery according to an embodiment of the present invention. Fig. 9 is a schematic structural view of an electrode assembly, a second tab and a second insulator of a battery according to an embodiment of the present invention. Referring to fig. 1 to 9, an embodiment of the present invention provides a battery.

Referring specifically to fig. 1, 2 and 3, 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. Specifically, the bottom wall 11 is provided with a liquid filling port 13, and the liquid filling port 13 communicates the accommodating chamber 30 and the outside. The liquid injection port 13 may be used to inject the electrolyte into the accommodating chamber 30.

Further, the battery 100 includes a sealing member 50, and the sealing member 50 covers the pouring outlet 13 to seal the pouring outlet 13. The sealing member 50 is welded with the bottom wall 11 to form a circle of first welding marks 15, and the first welding marks 15 are arranged around the periphery of the liquid filling opening 13, so that the liquid filling opening 13 can be tightly sealed, and the electrolyte is prevented from flowing out from a gap between the liquid filling opening 13 and the sealing member 50. In addition, the sealing piece 50 is located on one side of the bottom wall 11 far away from the accommodating cavity 30, so that the sealing piece 50 and the bottom wall 11 of the steel shell 10 can be conveniently welded, the sealing piece 50 and the bottom wall 11 can be firmly welded, the sealing performance of the liquid injection port 13 is better, and the welding yield of the liquid injection port 13 is improved. The electrode assembly 40 has a first tab 41, and the first tab 41 is welded to the bottom wall 11 and formed with a second weld mark 16, such that the bottom wall 11 and the first tab 41 are electrically connected, in this embodiment, the first tab 41 is a negative electrode, the case 10 is electrically connected to the first tab 41, and the case 10 is a negative electrode. The first solder print 15 and the second solder print 16 are both located on a side of the bottom wall 11 away from the accommodating cavity 30. The second imprint 16 is not coincident with the first imprint 15. Through making first welding seal 15 and second welding seal 16 not coincide, avoided first welding seal 15 and second welding seal 16 to influence each other, can further improve the welding yield of annotating liquid mouth 13 department, promoted battery 100 yield.

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 pouring outlet 13 may be located at any position of the bottom wall 11. The shape of the battery 100 may be a cylindrical battery, a square battery, a special-shaped battery, etc., and the shape of the battery 100 is not limited in the embodiment of the present invention, which is described by taking a cylindrical battery as an example.

In one possible embodiment, as shown in FIG. 8, the distance between the second solder mark 16 and the pour opening is less than the distance between the second solder mark 16 and the edge of the bottom wall 11, where L1 represents the distance between the second solder mark 16 and the pour opening and L2 represents the distance between the second solder mark 16 and the edge of the bottom wall 11. By making L1 smaller than L2, it is possible to weld the portion of the first tab 41 on the side closer to the liquid injection port with the bottom wall 11 as much as possible, so that the first tab 41 is more firmly fixed, and further, since an insulating member is usually provided between the first tab 41 and the electrode assembly 40, and the center of the electrode assembly 40 near the liquid injection port is hollow, it is possible to avoid the welding from affecting the insulating properties of the insulating member to the greatest extent possible.

In an embodiment, the second solder mark 16 has a solder bump, and the solder bump can be regarded as a portion of the second solder mark 16 protruding to a side of the bottom wall 11 away from the accommodating cavity 30, and the height of the solder bump is not greater than 0.05 mm. Thus, the height of the welding projection can be made as small as possible, the height space of the battery 100 occupied by the welding projection can be made as small as possible, and the energy density of the battery 100 can be improved.

In an embodiment that can be realized, as shown in fig. 3, the bottom wall 11 has a counter bore 14 on a side away from the receiving chamber 30, the liquid injection port 13 is located in the counter bore 14, and the sealing member 50 is attached to at least a part of the 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 50, so that the overall height of the case 10 is not increased after welding the sealing member 50, and the electrode assembly 40 occupies a maximum space in a limited space, which is advantageous for increasing the energy density of the battery 100. It will be appreciated that the thickness of the closure 50 may be less than the depth of the counterbore 14, so that the first weld impression 15 may also be located in the counterbore 14, avoiding that the weld lobe of the first weld impression 15 protrudes beyond the surface of the bottom wall 11.

In one possible embodiment, the diameter of the pouring outlet 13 is in the range of 1.0 to 1.5mm, and specifically, the diameter may be 1mm, 1.2mm, 1.3mm or 1.5 mm. When the diameter is smaller than 1mm, the diameter of the liquid inlet 13 is too small to allow the battery 100 to be filled with a tool. When the diameter is larger than 1.5mm, the hole diameter of the liquid pouring port 13 is too large, and as the hole diameter is larger, sealing becomes difficult, and the risk of leakage from the liquid pouring port 13 under the same sealing conditions becomes larger.

In one possible embodiment, the counterbore 14 is cylindrical, which not only facilitates the placement of the counterbore 14 and the closure 50, but also facilitates the fitment of the closure 50 with the counterbore 14. The diameter of the counterbore 14 may range from 1.5mm to 3mm, and specifically, the diameter may be 1.5mm, 1.8mm, 2.5mm or 3 mm. When the diameter is less than 1.5mm, the counterbore 14 is too small to facilitate welding of the counterbore 14 to the closure 50. When the diameter is larger than 3mm, the counter bore 14 occupies too much space of the bottom wall 11, which tends to reduce the structural strength of the bottom wall 11, thereby reducing the service life of the housing 10.

In one possible embodiment, the depth of the counterbore 14 ranges from 0.05mm to 0.15mm, and in particular, the depth may be 0.05mm, 0.08mm, 0.13mm, or 0.15 mm. When the depth is less than 0.05mm, the counterbore 14 cannot fully accommodate the sealing member 50, resulting in a portion of the sealing member 50 protruding out of the bottom wall 11 in the height direction, occupying a height space of the battery 100, and reducing the energy density of the battery 100. When the depth is greater than 0.15mm, on the one hand, the counterbore 14 has an extra space in the height direction after accommodating the sealing member 50, and on the other hand, the thickness of the bottom wall 11 in the counterbore 14 is made thinner, which lowers the structural strength of the bottom wall 11.

In one possible embodiment, the diameter of the closure 50 may range from 1.5 to 3mm, and in particular, the diameter may be 1.5mm, 1.8mm, 2.5mm or 3 mm. It will be appreciated that the diameter of the sealing member 50 should be less than or equal to the diameter of the counterbore 14 so that the sealing member 50 can be fitted over the counterbore 14 to allow the sealing member 50 to completely seal the pour spout 13. When the diameter is smaller than 1.5mm, on one hand, the joint area of the sealing member 50 and the counterbore 14 is limited, which results in poor sealing effect, and on the other hand, welding of the sealing member 50 and the counterbore 14 is not facilitated. When the diameter is larger than 3mm, the counter bore 14 cannot accommodate the sealing member 50, and the sealing member 50 is located outside the counter bore 14, increasing the height space of the battery 100 and reducing the energy density of the battery 100.

In one possible embodiment, the thickness of the closure 50 may be in the range of 0.05 to 0.15mm, in particular 0.05mm, 0.08mm, 0.13mm or 0.15 mm. When the thickness is less than 0.05mm, the sealing member 50 is too thin, resulting in too low structural strength of the sealing member 50, and the sealing member 50 is easily damaged during welding. When the thickness is greater than 0.15mm, the sealing member 50 is too thick, so that the counter bore 14 cannot completely accommodate the sealing member 50, and a part of the sealing member 50 protrudes from the bottom wall 11 in the height direction, thereby occupying the height space of the battery 100 and reducing the energy density of the battery 100.

In one possible embodiment, as shown in fig. 4, 5 and 6, the cover assembly 20 includes a cover 21 and a conductive member 22, the cover 21 is connected to the side wall 12 of the housing 10, the conductive member 22 is located on a side of the cover 21 close to the accommodating cavity 30, the cover 21 is provided with a through hole 211, at least a part of the conductive member 22 is located in the through hole 211, and the conductive member 22 and the cover 21 are connected in an insulated manner; one end of the electrode assembly 40 near the top cap 21 has a second tab 42, and the second tab 42 is welded to the conductive member 22 and is formed with the third weld 17. 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.

In one possible embodiment, the conductive member 22 has a boss 221 on a side thereof away from the receiving cavity 30, and the boss 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 the sidewall 12 of the protrusion 221 should be insulated from the edge of the through hole 211, and specifically, 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 boss 221 and the edge of the through-hole 211.

In an embodiment, at least a partial orthographic projection of the third solder mark 17 on the bottom wall 11 coincides with an orthographic projection of the first solder mark 15 on the bottom wall 11, wherein the orthographic projection of the third solder mark 17 on the bottom wall 11 and the orthographic projection of the first solder mark 15 on the bottom wall 11 may all coincide, or the orthographic projection of the third solder mark 17 on the bottom wall 11 and the orthographic projection of the first solder mark 15 on the bottom wall 11 may partially coincide. Specifically, the third solder mark 17 may be located on the conductive member 22 near the boss 221, and the liquid injection port 13 may be located at the center of the bottom wall 11, so that the first solder mark 15 and the second solder mark 16 may be overlapped.

It is understood that the welding between the first tab 41 and the bottom wall 11, the second tab 42 and the conductive member 22, and the sealing member 50 and the bottom wall 11 may be laser welding.

In one possible embodiment, a first insulating member 60 is disposed between the conductive member 22 and the top cover 21. The first insulating member 60 may be an insulating paste having an adhesive property, so as to not only have an insulating function, but also adhere the conductive member 22 and the top cover 21 tightly. Illustratively, the insulating glue may be a thermosetting glue or a thermoplastic glue. The utility model does not limit the type of the insulating glue.

In one possible embodiment, as shown in fig. 9, a second insulator 70 is disposed between each of the first and second tabs 41 and 42 and the electrode assembly 40. It should be noted that, in the height direction of the battery 100, a separator is generally disposed between the first and second tabs 41 and 42 and the electrode assembly 40, the separator mainly plays an insulating role, and the second insulator 70 is disposed to enhance the insulating role between the first tab 41 (the second tab 42) and the electrode assembly 40. The second insulating member 70 and the first insulating member 60 may be the same in kind, and thus, a detailed description thereof will be omitted. For example, the second insulator 70 may have a circular ring shape.

In one possible embodiment, as shown in fig. 2 and 4, a protrusion 212 is provided on a side of the top cover 21 close to the receiving cavity 30, the protrusion 212 is located in the receiving cavity 30, and the protrusion 212 has a contour shape matching the inner contour shape of the side wall 12. Thus, when the top cover 21 and the shell 10 are welded, the convex part 212 extends into the shell 10 to position the top cover 21, and welding is more convenient.

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 (10)

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 battery also comprises a sealing piece, the sealing piece covers the liquid injection port, the sealing piece and the bottom wall are welded to form a circle of first welding mark, and the first welding mark is arranged on the periphery of the liquid injection port in a winding mode;

the electrode assembly is provided with a first tab, the first tab is welded with the bottom wall and forms a second welding mark, and the first welding mark and the second welding mark are both positioned on one side, away from the accommodating cavity, of the bottom wall; the second weld impression is not coincident with the first weld impression.

2. The battery of claim 1, wherein a distance between the second solder print and the pour opening is less than a distance between the second solder print and an edge of the bottom wall.

3. The battery of claim 1, wherein the second solder print has a solder bump thereon, the solder bump having a height of no greater than 0.05 mm.

4. The battery of any one of claims 1-3, wherein a counter bore is formed in the bottom wall on a side away from the accommodating cavity, the liquid injection port is located in the counter bore, and the sealing member is attached to at least a part of an inner wall surface of the counter bore.

5. The battery of claim 4, wherein the diameter of the liquid inlet is in the range of 1.0-1.5 mm.

6. The battery of claim 4, wherein the counterbore is cylindrical, the diameter of the counterbore being in the range of 1.5-3 mm;

and/or the depth range of the counter bore is 0.05-0.15 mm;

and/or the diameter range of the sealing piece is 1.5-3 mm;

and/or the thickness of the sealing piece ranges from 0.05mm to 0.15 mm.

7. The battery of any of claims 1-3, wherein the top cap assembly comprises a top cap and a conductive member, the top cap is connected to the side wall of the housing, the conductive member is located on a side of the top cap near the receiving cavity, the top cap is provided with a through hole, at least a portion of the conductive member is located in the through hole, and the conductive member is insulated from the top cap;

and one end of the electrode assembly, which is close to the top cover, is provided with a second tab, and the second tab is welded with the conductive piece to form a third welding mark.

8. The battery of claim 7, wherein the conductive member has a boss on a side thereof away from the receiving cavity, and the boss penetrates through the through hole.

9. The battery of claim 7, wherein at least a partial orthographic projection of the third solder print on the bottom wall coincides with an orthographic projection of the first solder print on the bottom wall.

10. The battery of claim 7, wherein a first insulating member is disposed between the conductive member and the top cover;

and/or a second insulator is arranged between the first electrode lug and the electrode assembly and between the second electrode lug and the electrode assembly.

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