CN216389654U

CN216389654U - Battery with a battery cell

Info

Publication number: CN216389654U
Application number: CN202122977301.8U
Authority: CN
Inventors: 徐鑫; 郭苗苗
Original assignee: Sany Technology Equipment Co Ltd
Current assignee: Sany Technology Equipment Co Ltd
Priority date: 2021-10-20
Filing date: 2021-11-30
Publication date: 2022-04-26
Anticipated expiration: 2031-11-30
Also published as: CN113991260A

Abstract

The present invention provides a battery comprising: the shell is provided with a cavity and an opening communicated with the cavity; the battery cell is arranged in the cavity of the shell; the end cover is covered at the opening; and/or, the fusion connection layer is arranged between the bottom wall of the shell and the battery core and is suitable for electrically connecting the bottom wall and the battery core. The structure achieves the purpose of quick fusion welding and fixing of the two ends of the battery core and the shell and/or the end cover by adding the fusion connecting layer, and the technical scheme of the utility model solves the defects that the electrode lugs are easy to be subjected to insufficient welding and the welding is not firm in the battery processing process in the prior art.

Description

Battery with a battery cell

Technical Field

The utility model relates to the technical field of power supply devices, in particular to a battery.

Background

With the continuous development of new energy, electric drive gradually becomes the mainstream of equipment drive, so that the demand of lithium batteries is larger and larger, and the performance requirement of the lithium batteries is higher and higher, and the welding quality of the lithium batteries is a main factor influencing the performance of the batteries. In order to ensure the welding quality of the lithium battery and realize high-precision welding, the laser welding technology is widely applied in the field of lithium battery welding in the prior art. In the laser welding technology, a laser welding machine is adopted to realize effective welding of the lithium battery tab and the end cover, and the end cover and the shell.

At present, when a lithium ion battery is welded, a positive electrode and a negative electrode of the battery are respectively welded with a pole piece under a common condition. In order to improve the high-current discharge performance, a plurality of tabs or a full tab form can be arranged on the battery negative electrode piece, and due to the fact that the tabs are overlapped, the phenomena of insufficient welding and poor welding easily occur in laser spot welding, and the welding stability is reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to overcome the defects that the electrode lug is easy to be subjected to insufficient welding and is not firmly welded in the battery processing process in the prior art, and thereby the battery is provided.

In order to solve the above problems, the present invention provides a battery including: the shell is provided with a cavity and an opening communicated with the cavity; the battery cell is arranged in the cavity of the shell; the end cover is covered at the opening; and/or, the fusion connection layer is arranged between the bottom wall of the shell and the battery core and is suitable for electrically connecting the bottom wall and the battery core.

Optionally, the fused connecting layer is a sheet-like structure.

Optionally, the fused connecting layer is in a circular or polygonal structure.

Optionally, a positioning structure for positioning the molten connection layer is provided in the cavity of the housing.

Optionally, the positioning structure includes a positioning hole and/or a positioning notch disposed on the melt connection layer, and a positioning protrusion disposed on a surface of the end cap facing the battery cell and engaged with the positioning hole and/or the positioning notch, or a positioning protrusion disposed on a surface of the bottom wall facing the battery cell and engaged with the positioning hole and/or the positioning notch.

Optionally, the positioning structure comprises a positioning protrusion, the positioning protrusion being disposed on a surface of the molten bond layer, and the positioning protrusion being disposed at and located at an edge of the molten bond layer; and/or, the positioning convex part is arranged on the end cover; and/or, the positioning projection is arranged on the bottom wall of the shell.

Optionally, a through hole is formed in the middle of the melting connection layer, a liquid injection hole is formed in the end cover, a liquid injection channel is formed in the middle of the battery core, and the through hole, the liquid injection hole and the liquid injection channel are communicated.

Optionally, an elongated section is disposed at the liquid injection hole of the end cover, and the elongated section passes through the through hole and is communicated with the liquid injection channel.

Optionally, an explosion-proof valve and a sealing plug are sequentially arranged in the liquid injection hole in the direction departing from the battery core.

Optionally, an explosion-proof valve is provided on the bottom wall.

Optionally, the surface of the fused connection layer is a non-planar structure.

Optionally, the surface or the inside of the fused connection layer is provided with a soldering flux, and/or the end part of the battery core is provided with a soldering flux.

Optionally, an overcurrent through hole and/or an overcurrent notch are/is arranged at the upper edge and/or the lower edge of the pole piece.

Optionally, the battery cell includes a pole piece and a diaphragm, wherein the diaphragm covers at least part of the through-flow hole.

Optionally, the battery cell includes a pole piece and a diaphragm, wherein the diaphragm does not completely cover the overcurrent notch.

Optionally, a limiting rolling groove is formed in the side wall of the casing, and the limiting rolling groove is suitable for being matched with the end portion of the battery core.

Optionally, the battery further comprises an insulating ring, the upper end and the lower end of the insulating ring are respectively abutted to the end cover and the battery core, and the melting connection layer is located on the inner side of the insulating ring.

The utility model has the following advantages:

by utilizing the technical scheme of the utility model, the fusion connecting layer is arranged between the battery cell and the end cover and/or between the battery cell and the bottom wall of the shell, and the surface shape of the fusion connecting layer can be determined according to the shape of the battery cell, so that the lug of the battery cell can be completely contacted with the fusion connecting layer, the battery cell can be rapidly and conductively welded, and the welding quality and the welding performance are stable. Therefore, the technical scheme of the utility model overcomes the defects that the electrode lug is easy to be subjected to insufficient welding and is not firmly welded in the battery processing process in the prior art.

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 described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 shows a schematic cross-sectional view of a first embodiment of a battery of the utility model;

FIG. 2 shows an enlarged schematic view at A in FIG. 1;

FIG. 3 shows an enlarged schematic view at B in FIG. 1;

FIG. 4 shows a schematic structural view of the fused connection layer of the cell of FIG. 1;

FIG. 5 is a schematic view showing a structure of the positioning protrusion provided on the molten bond layer in FIG. 4;

FIG. 6 is a schematic diagram of the flux applied to the fused connection layer of FIG. 4;

FIG. 7 shows a schematic representation of different surface structure forms of the fusion-bonded layer of FIG. 4;

FIG. 8 shows a schematic diagram of one configuration of a pole piece of the battery of FIG. 1;

FIG. 9 shows another schematic diagram of the construction of a pole piece of the cell of FIG. 1;

FIG. 10 shows another schematic of the structure of a pole piece of the battery of FIG. 1;

fig. 11 shows a schematic view of the stacking of positive and negative pole pieces and separators of the cells of the battery of fig. 1;

fig. 12 shows a schematic view of stacking the positive electrode sheets and the separators of the cells of fig. 11;

fig. 13 shows a schematic view of stacking of the separators of the negative electrode sheets of the cells of fig. 11;

FIG. 14 shows a schematic cross-sectional view of the opening of the battery of FIG. 1;

fig. 15 shows a schematic cross-sectional view of a second embodiment of the battery of the utility model;

fig. 16 shows a schematic structural view of a case of the battery of fig. 15;

fig. 17 shows a schematic cross-sectional view of a third embodiment of the battery of the utility model;

fig. 18 shows a schematic structural view of an end cap of the cell of fig. 17 (with the plug recessed in the end cap surface);

FIG. 19 shows a schematic structural view of the end cap of the cell of FIG. 17 provided with a transition plug;

fig. 20 shows a schematic cross-sectional view of a fourth embodiment of the battery of the utility model; and

fig. 21 shows a schematic cross-sectional view of the opening of the battery in fig. 20.

Description of reference numerals:

10. a housing; 11. a bottom wall; 12. a side wall; 121. limiting rolling grooves; 13. an opening; 20. an electric core; 21. pole pieces; 211. an overcurrent through hole; 212. an overflow notch; 22. a liquid injection channel; 23. a diaphragm; 30. an end cap; 31. a liquid injection hole; 32. a lengthening section; 40. fusing the connecting layer; 41. positioning holes; 42. positioning the notch; 43. a through hole; 44. a positioning projection; 50. positioning the projection; 60. an explosion-proof valve; 70. blocking; 80. an insulating ring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1 and 14, the battery of the first embodiment includes a case 10, a battery cell 20, an end cap 30, and a fusion-bonded layer 40. Wherein the housing 10 comprises a bottom wall 11 and a side wall 12, and the housing 10 has an opening 13. The battery cell 20 is formed by winding pole pieces 21 and a diaphragm 23, and the battery cell 20 is disposed in the casing 10, wherein the diaphragm 23 is disposed between adjacent pole pieces 21 for isolating and insulating the adjacent pole pieces 21. The end cap 30 covers the opening 13. A fusion bonding layer 40 is disposed between the end cap 30 and the cell 20, the fusion bonding layer 40 being adapted to conductively couple the end cap 30 and the cell 20, and/or between the bottom wall 11 and the cell 20, the fusion bonding layer 40 being adapted to conductively couple the bottom wall 11 and the cell 20.

By using the technical solution of this embodiment, the fusion bonding layer 40 is disposed between the battery cell 20 and the end cap 30, and/or between the battery cell 20 and the bottom wall 11 of the housing 10, and the surface shape of the fusion bonding layer 40 can be determined according to the shape of the battery cell 20, so that the tab of the battery cell 20 can be completely contacted with the fusion bonding layer 40, and the battery cell 20 can be subjected to rapid conductive welding, thereby ensuring stable welding quality and welding performance. Therefore, the technical scheme of the embodiment overcomes the defects that the tab is easy to be subjected to insufficient welding and the welding is not firm in the battery processing process in the prior art.

It should be noted that the battery cell 20 includes positive and negative electrode plates and a diaphragm 23, the electrode plate 21 and the diaphragm 23 are wound according to a certain rule to form the battery cell 20, the battery cell 20 has a central hole, and the positive and negative electrode tab structures are formed at two ends of the battery cell 20. And the tab can be of a non-polar tab, a full tab or a multi-tab structure. Of course, the battery cell 20 may be made by other materials and processes.

It should be noted that the side wall 12 of the housing 10 is a ring structure, so that the housing 10 forms a cylindrical structure. The battery cell 20 is accommodated in the casing 10, and the end cap 30 covers the opening of the casing 10, thereby closing the accommodating space in the casing 10.

Further, the bottom wall 11 and the side wall 12 may be formed integrally, or may be connected together in an assembling manner (that is, the bottom wall 11 is connected to the bottom of the side wall 12 in the form of a bottom end cover).

As shown in fig. 2, the upper edge of the side wall 12 of the housing 10 is provided with a flange, and the edge of the end cap 30 is inserted into the flange, so that the end cap 30 is fixed to the housing 10.

As shown in fig. 2 and fig. 3, in the solution of the present embodiment, the fusion-bonding layers 40 are disposed between the battery cell 20 and the end cap 30, and between the battery cell 20 and the bottom wall 11 of the casing 10. The above structure enables both ends of the battery cell 20 to be fusion-welded. Preferably, the fusion welding is low-temperature fusion welding, and the fusion welding has conductivity after fusion, and the fusion temperature is within an acceptable range for ensuring the stable performance of the material of the battery core 20.

It is worth to be noted that, in the laser welding in the prior art, the welding process is complicated, the battery needs to be turned over after one side end cover of the battery is welded, and then the other side end cover of the battery needs to be welded, so that the battery core is easy to fall and deform in the turning process. In the embodiment, since the fusion connection layers 40 are disposed at both ends of the battery cell 20, the two end surfaces of the battery cell 20 can be fusion-welded at the same time, so as to realize the welding of the two ends, thereby simplifying the production process.

Preferably, when the cell 20 is fusion-welded at both ends, the two ends may be fusion-welded at the same time, or one end of the cell 20 is fusion-welded first, and then the other end is fusion-welded later.

Preferably, the heating means for fusion welding includes, but is not limited to, contact heating, infrared heating, laser heating, electromagnetic heating, microwave heating, and the like, preferably microwave heating.

Of course, in some embodiments, which are not shown, the fused connection layer 40 may be provided only at one end of the battery cell 20. That is, the fusion-bonding layer 40 may be provided only between the cell 20 and the end cap 30, or the fusion-bonding layer 40 may be provided only between the cell 20 and the bottom wall 11 of the casing 10. That is, in the two embodiments, which are not shown, one end of the battery cell 20 is fusion-welded, and the other end of the battery cell 20 may be connected by laser welding or welding-free method.

Preferably, the fused connecting layer 40 is a low temperature fusible solder tab. Further, the material of the fusion-bonding layer 40 is tin or a tin-based alloy, which enables the fusion-bonding layer 40 to realize low-temperature soldering. Further limitedly, the melted connection layer 40 in this embodiment is solder, and when there is an overlapping portion of the tabs, the solder is melted and infiltrated between the tabs, so as to achieve complete welding between the tabs and the end cap 30 or the bottom wall 11. Of course, the fused connection layer 40 may be made of other materials that can be fused at a low temperature and can be electrically conductive.

As shown in fig. 4, in the present embodiment, the fusion-bonding layer 40 has a sheet-like structure. Preferably, the fused link layer 40 in this embodiment is a fusible solder tab.

Further, the fuse bonding layer 40 may have a single layer structure or a multi-layer structure, that is, the fuse bonding layer 40 may be a single solder piece, or the fuse bonding layer 40 may be formed by stacking a plurality of solder pieces.

As shown in fig. 4, in the solution of the present embodiment, the fusion-bonding layer 40 has a circular or polygonal structure. Further, the shape of the fused connection layer 40 may be circular, square, polygonal, or other shaped shape. Specifically, the shape of the fusion-bonding layer 40 may be determined according to the end surface shape of the battery cell 20, so that the tab of the battery cell 20 and the end cap 30 (or the bottom wall 11 of the housing 10) may be completely welded, the heat dissipation area is large, and the welding performance is stable.

As shown in fig. 4, 5 and 16, in the solution of the present embodiment, a positioning structure for positioning the molten connection layer 40 is provided in the cavity of the housing 10. The term "inside the cavity of the housing 10" refers to the space of the cavity inside the housing 10 after the battery is processed, and the top wall, the bottom wall and the side walls of the cavity. The above-mentioned "cavity of the housing 10" therefore includes the internal space of the housing 10 (and the structures provided within the internal space), the bottom wall 11 of the housing 10, the side walls 12 of the housing 10, and the end cap 30. The positioning structure may be provided at the above-mentioned position.

As shown in fig. 4 and fig. 16, in the solution of the present embodiment, the fusion-splicing layer 40 is provided with positioning holes 41 and/or positioning notches 42, and the surface of the end cap 30 facing the battery cell 20 is provided with positioning protrusions 50 matching with the positioning holes 41 and/or the positioning notches 42, or the surface of the bottom wall 11 facing the battery cell 20 is provided with positioning protrusions 50 matching with the positioning holes 41 and/or the positioning notches 42. Specifically, in the present embodiment, the melt-bonding layer 40 is provided with positioning holes 41 and positioning notches 42. The end cap 30 is provided with a positioning protrusion 50 on an inner surface facing the battery cell 20, and the positioning protrusion is matched with the positioning hole 41 and the positioning notch 42 on the melt connection layer 40 at the upper end of the battery cell 20, so as to position the melt connection layer 40 at the upper end of the battery cell 20. The bottom wall 11 of the casing 10 is provided with a positioning protrusion 50 facing the inner surface of the battery cell 20, and the positioning protrusion is matched with the positioning hole 41 and the positioning notch 42 on the melt connection layer 40 at the lower end of the battery cell 20, so as to position the melt connection layer 40 at the lower end of the battery cell 20.

Preferably, in some embodiments, not shown, only the positioning holes 41 or only the positioning notches 42 may be formed on the melt-bonding layer 40, and the positioning protrusions 50 may be adaptively adjusted.

Preferably, the positioning holes 41 and the positioning notches 42 may be single or plural.

Preferably, in some embodiments, which are not shown, when the fusion-bonding layer 40 is only disposed between the battery cell 20 and the end cap 30, the positioning protrusion 50 is only disposed on the end cap 30. When the fusion-bonding layer 40 is provided only between the battery cell 20 and the bottom wall 11 of the casing 10, the positioning protrusion 50 may be provided only on the bottom wall 11 of the casing 10.

As shown in fig. 14, in the technical solution of this embodiment, a through hole 43 is formed in the middle of the molten connection layer 40, a liquid injection hole 31 is formed in the end cap 30, a liquid injection channel 22 is formed in the middle of the battery cell 20, and the through hole 43, the liquid injection hole 31 and the liquid injection channel 22 are arranged in a communicating manner. Specifically, the through hole 43, the pour hole 31, and the pour channel 22 described above collectively form an electrolyte pour channel.

As shown in fig. 1 and 14, in the solution of the present embodiment, the end cap 30 is provided with an explosion-proof valve 60 and a sealing plug 70. Wherein, the sealing plug 70 is arranged at the liquid injection hole 31, and the explosion-proof valve 60 is arranged at the side part of the sealing plug 70. That is, in the present embodiment, the blocking plug 70 and the explosion-proof valve 60 are arranged in a staggered manner. The plug 70 can act as a plug for the pour hole 31. When the pressure in the housing 10 is excessive, the explosion-proof valve 60 is automatically broken to prevent the battery from exploding.

Of course, the plug 70 and the explosion-proof valve 60 may be disposed on the bottom wall 11 of the housing 10.

As shown in fig. 5, in the solution of the present embodiment, the positioning convex portion 44 is provided on the surface of the melt-joining layer 40, and the positioning convex portion 44 is provided at the edge of the melt-joining layer 40. Specifically, the positioning protrusions 44 described above form an arm structure, the positioning protrusions 44 are used to further fix the molten bond layer 40, and one or more positioning protrusions 44 may be provided.

Of course, the positioning protrusion 44 may be provided on the end cap 30, or the positioning protrusion 44 may be provided on the bottom wall 11.

Preferably, the plurality of positioning protrusions 44 may have the same or different shape structures, and the cross-sectional shape of the positioning protrusions 44 may have various shapes such as a circle or a square.

As shown in fig. 7, in the solution of the present embodiment, the surface of the molten connection layer 40 has a non-planar structure. Specifically, the surface of the molten bond layer 40 is defined by a contact surface, which may be a multi-grooved structure, a cylindrical shape, a conical shape, a spike shape, or other suitable contact surface.

As shown in fig. 6, in the technical solution of this embodiment, the surface of the molten connection layer 40 is coated with the flux, and the flux may be coated on a single side or on both sides. Alternatively, the flux is provided inside the fused connection layer 40 (for example, the flux is mixed in during the production process of the fused connection layer 40), and the flux has a flux effect after the fused connection layer 40 is melted.

Preferably, the tabs at the two ends of the battery cell 20 may also be further dipped with flux to improve the weldability between the tabs and the end cover 30 (or the bottom wall 11 of the casing 10).

As shown in fig. 8 to 10, in the technical solution of the present embodiment, the pole piece 21 is provided with an overcurrent through hole 211 and/or an overcurrent notch 212 at the upper edge and the lower edge. That is, the tab can be in an open hole or notched structure. The through-current through-hole 211 or the through-current notch 212 may be single or plural. The shape of the through-flow via 211 includes, but is not limited to, a circle, a square, a triangle, and other regular or irregular shapes. The shape of the flow notches 212 includes, but is not limited to, rectangular, triangular, wavy, or other regular or irregular shapes. The arrangement form of the overcurrent through holes 211 and the overcurrent notches 212 can be regular or irregular arrangement and combination. The overcurrent through holes 211 and the overcurrent notches 212 form a plurality of electrolyte channels on the tabs, so that the rapid infiltration of electrolyte is realized.

Preferably, only the through-flow through holes 211 or only the through-flow notches 212 may be provided at the upper and lower edges of the pole piece 21.

As shown in fig. 11, the battery cell 20 in this embodiment includes two pole pieces 21 and two separators 23, where the two pole pieces 21 are a positive pole piece and a negative pole piece, respectively. Referring to fig. 11, the cells 20 are stacked in a left-to-right direction in such a manner that the positive electrode sheet-separator 23-the negative electrode sheet-separator 23. And the positive electrode tab protrudes upward from the separator 23 and the negative electrode tab protrudes downward from the separator 23. As shown in fig. 12, the positive electrode tab protrudes from the separator 23 to form a tab, and is connected to the end cap 30 by a fusion bonding layer 40. As shown in fig. 13, the negative electrode tab protrudes from the separator 23 to form a tab and is connected to the bottom wall 11 through a fusion bonding layer 40.

Further, as shown in fig. 12 and 13 in combination, when the pole piece 21 is provided with the through-flow hole 211, the diaphragm 23 covers at least a portion of the through-flow hole 211. That is, the diaphragm 23 may cover a part of the area of the through-flow through hole 211, or the diaphragm 23 may completely cover the through-flow through hole 211, thereby forming a through-flow channel in the battery cell 20.

Further, as shown in fig. 12 and 13, when the pole piece 21 is provided with the flow gap 212, the diaphragm 23 does not completely cover the flow gap 212. That is, the diaphragm 23 needs to cover at least a part of the area of the flow-through gap 212, so that a flow-through channel is formed in the battery cell 20. The diaphragm 23 does not completely cover the flow gap 212, so that the ends of the pole piece 21 form a tab structure.

When the through-flow hole 211 or the through-flow notch 212 (or both) are provided in the pole piece 21, the position of the diaphragm 23 can be adjusted as described above.

As shown in fig. 14, in the technical solution of the present embodiment, a limiting rolling groove 121 is provided on the side wall 12, and the limiting rolling groove 121 is adapted to be matched with an end of the battery cell 20. The limiting rolling groove 121 is of a rolling groove structure, and the limiting rolling groove 121 is used for limiting the position of the battery cell 20.

As shown in fig. 14, in the technical solution of this embodiment, the battery further includes an insulating ring 80, upper and lower ends of the insulating ring 80 are respectively abutted against the end cap 30 and the battery cell 20, and the fusion connecting layer 40 is located inside the insulating ring 80.

Example two

As shown in fig. 15 and 16, the battery of the second embodiment is different from the battery of the first embodiment in that an explosion-proof valve 60 is provided on the bottom wall 11. The fixing form of the explosion-proof valve 60 and the bottom wall 11 of the housing 10 may be an integral punch forming, or may be other fixing forms such as welding, fastening, or gluing.

In this embodiment, the explosion-proof valve 60 and the blocking plug 70 correspond to each other in the vertical position, but the explosion-proof valve 60 and the blocking plug 70 may be arranged in a staggered manner in the vertical position.

EXAMPLE III

As shown in fig. 17 and 19, the battery of the third embodiment is different from the battery of the first embodiment in that an explosion-proof valve 60 and a blocking plug 70 are provided in this order in the liquid inlet hole 31 in the direction away from the battery cell 20. That is, in the present embodiment, the explosion-proof valve 60 and the blocking plug 70 are disposed in a stacked manner. Specifically, the explosion-proof valve 60 and the plug 70 are an integral structure, and the fixing form of the two can be stamping, welding, clamping, or gluing.

As shown in fig. 19, a transition plug is provided in the pour hole 31 during battery production, and the transition plug is used to temporarily seal the pour hole 31 after the completion of pouring. After the subsequent processes such as formation and grading are finished, the transition plug is integrally replaced by the integrated explosion-proof valve 60 and the plugging plug 70, so that the battery is sealed.

As shown in fig. 18 and 19, in the solution of the present embodiment, the outer surface of the blocking plug 70 and the outer surface of the end cap 30 have a height difference. Specifically, the outer surface of the plug 70 protrudes from the outer surface of the end cap 30, or the outer surface of the plug 70 is recessed from the outer surface of the end cap 30, so that a step structure, that is, a height difference is formed between the two. The sealing plug 70 and the end cap 30 are arranged in a certain height difference manner, so that welding and fixing are facilitated, and the material of the sealing plug 70 can be the same as that of the end cap 30 or the easily-welded material of the end cap 30.

Of course, in some embodiments, which are not shown, the explosion-proof valve 60 and the blocking plug 70 may not be provided as an integral structure, and they may be sequentially installed in the liquid pouring hole 31. Meanwhile, the explosion-proof valve 60 and the blocking plug 70 may be stacked and disposed on the bottom wall 11 of the housing 10.

Example four

As shown in fig. 20 and 21, in the battery of the fourth embodiment and the first to third embodiments, an extension 32 is provided at the pour hole 31 of the end cap 30. The extension section 32 is a tubular structure, the extension section 32 extends toward the inside of the housing 10, and the extension section 32 passes through the through hole 43 and then communicates with the liquid injection channel 22. In the battery production process, the injection is performed after welding, so that the extension 32 has the effect of centering the molten connection layer 40 during the welding process. Meanwhile, the elongated section 32 can prevent the molten connection layer 40 from partially blocking the electrolyte injection passage after melting at the time of welding.

According to the above description, the present patent application has the following advantages:

1. the battery end cover and the battery core can be welded at low temperature by melting, and two ends can be simultaneously and rapidly welded in a conductive manner;

2. the battery core tab and the end cover can be completely welded, and the heat dissipation area is large;

3. the shape and the surface of the soldering lug can be limited according to the outline of the contact surface, so that the lug is completely contacted with the soldering lug, complete welding is ensured, and the welding performance is stable;

4. the opening of the edge of the pole piece can form a plurality of electrolyte channels, so that the battery cell infiltration speed is increased;

5. annotate the liquid hole and be located electric core center directly over, electric core center channel can regard as notes liquid passageway, annotates the liquid hole and fills liquid hole and shutoff stopper and be located same position, need not to open alone and annotate the liquid hole.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A battery, comprising:

a housing (10), the housing (10) having a cavity and an opening (13) in communication with the cavity;

a battery cell (20), the battery cell (20) disposed within a cavity of the housing (10);

an end cap (30) covering the opening (13);

a fused connection layer (40) disposed between the end cap (30) and the cell (20), the fused connection layer (40) being adapted to conductively connect the end cap (30) and the cell (20), and/or disposed between a bottom wall (11) of the housing (10) and the cell (20), the fused connection layer (40) being adapted to conductively connect the bottom wall (11) and the cell (20).

2. The battery according to claim 1, wherein the fused connection layer (40) is a sheet-like structure.

3. The cell according to claim 1 or 2, wherein the fused connection layer (40) has a circular or polygonal structure.

4. The battery according to claim 1 or 2, characterized in that a positioning structure for positioning the molten connection layer (40) is provided in the cavity of the outer shell (10).

5. The battery according to claim 4, wherein the positioning structure comprises a positioning hole (41) and/or a positioning notch (42) provided on the melt-bonding layer (40), and a positioning protrusion (50) provided on a surface of the end cap (30) facing the battery cell (20) and engaged with the positioning hole (41) and/or the positioning notch (42), or a positioning protrusion (50) provided on a surface of the bottom wall (11) facing the battery cell (20) and engaged with the positioning hole (41) and/or the positioning notch (42).

6. The battery according to claim 4, wherein the positioning structure comprises a positioning protrusion (44) disposed on a surface of the molten connection layer (40) and at an edge of the molten connection layer (40); and/or the positioning projection (44) is arranged on the end cover (30); and/or the positioning projection (44) is arranged on the bottom wall (11) of the housing (10).

7. The battery according to claim 1 or 2, wherein a through hole (43) is formed in the middle of the molten connection layer (40), a liquid injection hole (31) is formed in the end cover (30), a liquid injection channel (22) is formed in the middle of the battery core (20), and the through hole (43), the liquid injection hole (31) and the liquid injection channel (22) are communicated.

8. The battery according to claim 7, wherein an elongated section (32) is provided at the liquid injection hole (31) of the end cap (30), and the elongated section (32) passes through the through hole (43) and communicates with the liquid injection channel (22).

9. The battery according to claim 7, characterized in that an explosion-proof valve (60) and a sealing plug (70) are arranged in the liquid injection hole (31) in sequence in the direction away from the battery cell (20).

10. The cell according to claim 1 or 2, characterised in that an explosion-proof valve (60) is provided on the end cap (30) and/or on the bottom wall (11) of the casing (10).

11. The cell according to claim 10, characterised in that a closure (70) is provided on the end cap (30) and/or on the bottom wall (11) of the housing (10).

12. The battery according to claim 11, wherein the explosion-proof valve (60) and the blocking plug (70) are disposed in a misaligned arrangement, or the explosion-proof valve (60) and the blocking plug (70) are disposed in a stacked arrangement.

13. The cell of claim 1 or 2, wherein the surface of the fused connection layer (40) is a non-planar structure.

14. The battery according to claim 1 or 2, characterized in that the surface or the interior of the fused connection layer (40) is provided with a soldering flux, and/or the ends of the cells (20) are provided with a soldering flux.

15. The battery according to claim 1 or 2, characterized in that the upper edge and/or the lower edge of the pole piece (21) of the battery core (20) is/are provided with an overcurrent through hole (211) and/or an overcurrent notch (212).

16. The battery according to claim 15, characterized in that the battery core (20) comprises the pole piece (21) and a diaphragm (23), wherein the diaphragm (23) covers at least part of the through-flow through hole (211).

17. The battery according to claim 15, characterized in that the battery core (20) comprises the pole piece (21) and a membrane (23), wherein the membrane (23) does not completely cover the overcurrent notch (212).

18. The battery according to claim 1 or 2, characterized in that a limiting rolling groove (121) is arranged on the side wall (12) of the casing (10), and the limiting rolling groove (121) is suitable for being matched with the end part of the battery core (20).

19. The battery according to claim 1 or 2, further comprising an insulating ring (80), wherein the upper end and the lower end of the insulating ring (80) are respectively abutted against the end cap (30) and the battery core (20), and the fused connection layer (40) is positioned on the inner side of the insulating ring (80).