CN215070095U

CN215070095U - Battery with a battery cell

Info

Publication number: CN215070095U
Application number: CN202121750421.8U
Authority: CN
Inventors: 卫志达; 彭宁; 谢斌
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-12-07
Anticipated expiration: 2031-07-29

Abstract

The utility model provides a battery relates to battery technical field to there is the big technical problem of the manufacturing degree of difficulty in solving current lithium cell. A first conductive piece is arranged in the containing cavity of the battery, an insulating bonding layer is arranged between the first conductive piece and the bottom cover, and the insulating bonding layer is connected with the first conductive piece and the bottom cover. A through hole is formed in the bottom cover, and the first conductive piece covers the through hole. The annular side wall is welded with the bottom cover at one side edge close to the bottom cover and is provided with a circle of welding marks. The first electrode lug of the battery cell is electrically connected with the first conductive piece, and the second electrode lug of the battery cell is electrically connected with the shell. The utility model discloses can reduce the manufacturing degree of difficulty of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field especially relates to a battery.

Background

The lithium battery has the advantages of high energy density, long service life, environmental protection and the like. The lithium battery is widely applied to industries such as mobile phones, notebook computers, digital cameras, electric vehicles, electric tools, new energy automobiles and the like.

The current lithium battery generally comprises a battery core and a packaging shell, wherein the battery core is positioned in the packaging shell, the packaging shell comprises a top shell and a bottom shell which are mutually covered, and the top shell and the bottom shell are connected by welding. The battery core is formed by winding an anode electrode and a cathode electrode, and a separator is arranged between the anode electrode and the cathode electrode. The utmost point ear of electric core is connected through electric connection subassembly and packing shell electricity, is provided with the insulated glue paper between utmost point ear and the packing shell to and between electric core and the bottom, and electric connection subassembly passes through the riveting and connects on the packing shell.

However, the current lithium battery has the problem of great manufacturing difficulty.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the background art, the utility model provides a battery can reduce the manufacturing degree of difficulty of battery.

In order to achieve the above object, the utility model provides a battery, this battery include electrically conductive casing and electric core, and the casing includes top shell and bottom, and the top shell includes the top cap and connects the annular lateral wall on the top cap, and the top shell lid closes on the bottom, and encloses into the holding chamber jointly, and electric core is located the holding intracavity.

A first conductive piece is arranged in the containing cavity, an insulating bonding layer is arranged between the first conductive piece and the bottom cover, and the insulating bonding layer is connected with the first conductive piece and the bottom cover. A through hole is formed in the bottom cover, and the first conductive piece covers the through hole. The annular side wall is welded with the bottom cover at one side edge close to the bottom cover and is provided with a circle of welding marks.

The first electrode lug of the battery cell is electrically connected with the first conductive piece, and the second electrode lug of the battery cell is electrically connected with the shell.

The utility model provides a battery, through setting up top shell and bottom, can fill electric core in the holding intracavity that top shell and bottom formed, and be convenient for carry out welded seal to top shell and bottom after filling electric core. Through setting up first electrically conductive, can carry out electric connection with the first utmost point ear of electric core and external electrode. Through setting up insulating adhesive layer, can fix first electrically conductive piece and casing on the one hand, on the other hand can avoid first electrically conductive piece and bottom to take place the electrical contact. Compared with the mode of electrically connecting by rivets in the related art, the arrangement mode improves the available space of the accommodating cavity and the energy density of the battery on the one hand, and the structure and the connection mode of the first conductive piece are simple on the other hand, so that the manufacturing difficulty of the battery is reduced.

In the above battery, optionally, the solder stamp and the insulating adhesive layer have a first pitch therebetween, and a width of the first pitch is 3 times or more a width of the solder stamp.

In the above battery, optionally, the annular side wall has a flange at a side edge near the bottom cover, and the flange is welded to the bottom cover and forms a circle of welding mark around the periphery of the annular side wall.

In the above battery, optionally, the width of the solder mark is greater than 0mm and equal to or less than 1 mm.

In the above battery, optionally, a ratio of a covered area of the first conductive member on the bottom cover to an area of the bottom cover is 0.4 to 0.99.

In the above battery, optionally, the battery cell includes at least two pole pieces with opposite polarities, the battery cell has a stacking region, the at least two pole pieces in the stacking region are stacked on each other, and the pole pieces in the stacking region are parallel to the surface of the bottom cover and/or the top surface of the top case. And a diaphragm is arranged between the two pole pieces with opposite polarities.

In the battery, optionally, the first conductive component includes a first connecting plate and a first bending plate, the first connecting plate and the first bending plate are connected to each other, the first connecting plate is attached to the bottom cover, the first bending plate is located between the battery cell and the annular side wall, and the first tab is welded to the first bending plate.

In the above battery, optionally, the first connecting plate has a protrusion on a side away from the accommodating cavity, and the protrusion penetrates through the through hole.

In the above battery, optionally, a first gap is provided between an outer peripheral edge of the projection and a wall of the through hole. The width of the first gap ranges from 0.1 to 2 mm. The insulating adhesive layer has an overflow portion located in the first gap.

In the above battery, optionally, the first gap is filled with a sealing insulator.

In the above cell, optionally, the first bending plate and the annular sidewall have a second spacing therebetween, the second spacing ranging from 0.2 to 3 mm.

In the battery, optionally, a first insulating layer is disposed between the first bending plate and the battery cell, and/or a second insulating layer is disposed between the first bending plate and the annular sidewall.

In the above battery, optionally, the second tab is welded to the annular sidewall.

In the above battery, optionally, the distance between the first tab and the annular sidewall is greater than the distance between the second tab and the annular sidewall.

In the above battery, optionally, a second conductive member is disposed in the accommodating cavity, and at least a portion of the second conductive member is located between the second tab and the casing and electrically connected to the second tab and the casing.

The second conductive member and the first conductive member are insulated from each other.

In the above battery, optionally, the second conductive member includes a second connecting plate and a second bending plate that are connected to each other, the second connecting plate is attached to the bottom cover, the second bending plate is located between the battery cell and the annular side wall, and the second tab is welded to the second bending plate.

In the above battery, optionally, the difference in height between the first connecting plate and the second connecting plate is less than 0.3 mm.

A second gap is formed between the first connecting plate and the second connecting plate.

The width of the second gap ranges from 0.5mm to 5mm, and/or the second gap is filled with a porous insulating member.

In the battery, the first tab and the second tab are optionally located at the same end of the cell. The first bending plate and the second bending plate are located at the same end of the battery cell.

In the above battery, optionally, the first tab is located on a side of the first bending plate facing away from the battery cell, and/or the second tab is located on a side of the second bending plate facing away from the battery cell.

In the battery, optionally, a third insulating layer is further included, and the third insulating layer is located between the battery cell and the first conductive member, and between the battery cell and the second conductive member.

In the above battery, optionally, a third distance is provided between the end of the first tab and the end of the second tab, and the third distance is greater than or equal to 0mm and less than or equal to 1 mm.

In the above battery, optionally, the area of the first connection plate is larger than the area of the second connection plate, and the ratio of the areas of the first connection plate and the second connection plate ranges from 1 to 9.9.

In the above battery, optionally, the annular side wall is provided with a reinforcing sheet and a liquid filling port at an interval, the reinforcing sheet and the second tab are located on two opposite sides of the annular side wall, and the liquid filling port communicates with the outside of the case and the accommodating chamber. The top cover is provided with a pressure relief groove, and the pressure relief groove is arranged close to the first pole lug or the second pole lug.

The liquid filling port is provided with a sealing sheet which seals the liquid filling port.

And/or a final rubber is further arranged on the battery cell and is positioned on one side, close to the top cover, of the battery cell.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 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 according to an embodiment of the present invention at a second viewing angle;

fig. 3 is a side view of a housing of a battery according to an embodiment of the present invention;

fig. 4 is a top view of a housing of a battery according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a conductive piece, a bottom cover and a battery cell of a battery according to an embodiment of the present invention;

fig. 6 is an exploded view of a battery according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a bottom cover and a conductive member of a battery according to an embodiment of the present invention;

fig. 8 is an exploded view of a bottom cover and a conductive member of a battery according to an embodiment of the present invention at a first viewing angle;

fig. 9 is an exploded view of a bottom cover and a conductive member of a battery according to an embodiment of the present invention at a second viewing angle;

fig. 10 is a schematic view of a partial structure of a battery according to an embodiment of the present invention;

fig. 11 is an exploded view of another battery according to an embodiment of the present invention;

fig. 12 is a schematic partial structure diagram of another battery according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a cell end of a battery according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a cell tail portion of a battery provided in an embodiment of the present invention.

Description of reference numerals:

100-a battery;

10-a housing;

11-top shell;

111-annular side wall;

112-a top cover;

113-flanging;

12-a bottom cover;

13-a through hole;

14-a reinforcing sheet;

15-liquid injection port;

16-a sealing sheet;

17-a pressure relief groove;

18-welding and printing;

19-a support plate;

20-an accommodating cavity;

30-a conductive member;

31-a first conductive member;

311-a first connection plate;

3111-raised;

312 — a first bending plate;

32-a second electrically conductive member;

321-a second connecting plate;

322-a second bending plate;

40-an insulating adhesive layer;

50-a second insulating layer;

60-electric core;

61-a first tab;

62-a second tab;

70-third insulating layer.

Detailed Description

Just as the background art, among the related art, the electricity core and the packaging shell of lithium cell carry out the electricity connection through electrical connection subassembly, and this electrical connection subassembly is connected with the packaging shell through the riveting, concretely, electrical connection subassembly includes the rivet, the outer packing ring, the inner packing ring, terminal and insulator, the outer packing ring is worn to establish in proper order by the rivet, inner packing ring and terminal, the utmost point ear electricity of rivet and electricity core is connected, the insulator guarantees the insulation between electrical connection subassembly and the electricity core, on the one hand, electrical connection subassembly's spare part is more, it is big to lead to the lithium cell to make the degree of difficulty, on the other hand, because electrical connection subassembly (especially rivet) occupy the packaging shell inner space great, lead to the lithium cell energy density lower.

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 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 invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 according to an embodiment of the present invention at a second viewing angle. Fig. 3 is a side view of a housing of a battery according to an embodiment of the present invention. Fig. 4 is a top view of a battery case according to an embodiment of the present invention. Fig. 5 is a schematic structural diagram of a conductive piece, a bottom cover and a battery cell of a battery according to an embodiment of the present invention. Fig. 6 is an exploded view of a battery according to an embodiment of the present invention. Fig. 7 is a schematic structural diagram of a bottom cover and a conductive member of a battery according to an embodiment of the present invention. Fig. 8 is an exploded view of a bottom cover and a conductive member of a battery according to an embodiment of the present invention at a first viewing angle. Fig. 9 is an exploded view of a bottom cover and a conductive member of a battery according to an embodiment of the present invention at a second viewing angle. Fig. 10 is a schematic view of a partial structure of a battery according to an embodiment of the present invention. Fig. 11 is an exploded view of another battery according to an embodiment of the present invention. Fig. 12 is a schematic partial structure diagram of another battery according to an embodiment of the present invention. Fig. 13 is a schematic structural diagram of a cell end of a battery according to an embodiment of the present invention. Fig. 14 is a schematic structural diagram of a cell tail portion of a battery provided in an embodiment of the present invention.

Referring to fig. 1 to 14, an embodiment of the present invention provides a battery. This battery 100 includes electrically conductive casing 10 and electric core 60, and casing 10 includes top shell 11 and bottom 12, and top shell 11 includes top cap 112 and connects annular lateral wall 111 on top cap 112, and top shell 11 lid closes on bottom 12, and encloses into holding chamber 20 jointly, and electric core 60 is located holding chamber 20. The first conductive member 31 is disposed in the accommodating cavity 20, the insulating adhesive layer 40 is disposed between the first conductive member 31 and the bottom cover 12, the insulating adhesive layer 40 connects the first conductive member 31 and the bottom cover 12, and the insulating adhesive layer 40 can prevent the first conductive member 31 and the bottom cover 12 from being electrically contacted. Illustratively, the insulating adhesive layer 40 may be an insulating glue or an injection-molded insulator, wherein the injection-molded insulator is provided with an adhesive glue thereon. The first tab 61 of the battery cell 60 is electrically connected to the first conductive component 31, and the second tab 62 of the battery cell 60 is electrically connected to the casing 10. The bottom cover 12 is provided with a through hole 13, and the first conductive member 31 covers the through hole 13, so that a part of the first conductive member 31 can be exposed outside the accommodating cavity 20 to facilitate electrical connection with an external electrode.

As shown in fig. 10, the annular side wall 111 is welded to the bottom cover 12 at an edge thereof near the bottom cover 12 and is formed with a ring of weld marks 18. The solder mark 18 and the insulating adhesive layer 40 have a first interval L1 therebetween, and the width of the first interval L1 is 3 times or more the width of the solder mark 18. Thus, on one hand, the solder stamp 18 is prevented from contacting the insulating adhesive layer 40 during the soldering process, thereby preventing safety problems and improving safety of the battery 100 during the manufacturing process. On the other hand, the high temperature generated by welding is prevented from affecting the adhesive property of the insulating adhesive layer 40, so that the insulating property of the insulating adhesive layer 40 is prevented from being affected, and the working stability of the battery 100 is improved.

Specifically, as shown in fig. 10, the annular side wall 111 has a flange 113 at a side edge close to the bottom cover 12, the flange 113 is welded to the bottom cover 12 and forms a ring of welding imprints 18, and the welding imprints 18 are arranged around the outer periphery of the annular side wall 111. Through setting up turn-ups 113, can increase the laminating area of top shell 11 and bottom 12, make the two be convenient for weld to can improve the connection stability of top shell 11 and bottom 12.

In one possible embodiment, the width of the solder mark 18 is greater than 0mm and equal to or less than 1mm, wherein the width of the solder mark 18 may be 0.3mm, 0.5mm, 0.8mm or 1 mm. The width of the solder stamp 18 is within the above range, so that the top case 11 and the bottom case 12 can be welded stably and well, and the welding workload can be reduced, thereby reducing the manufacturing cost.

In one possible embodiment, the ratio of the covered area of the first conductive member 31 on the bottom cover 12 to the area of the bottom cover 12 is 0.4-0.99, wherein the ratio may be 0.4, 0.6, 0.8 or 0.99. The ratio is within the above range, so that the contact area between the first conductive member 31 and the bottom cover 12 is within a reasonable range, the connection stability between the first conductive member 31 and the bottom cover 12 is better, the first conductive member 31 is prevented from sliding relatively on the bottom cover 12, and the stability of the battery 100 is improved.

It should be noted that the battery cell 60 includes at least two pole pieces (not shown) with opposite polarities, the battery cell 60 has a stacking region, the at least two pole pieces in the stacking region are stacked on each other, and the pole pieces in the stacking region are parallel to the surface of the bottom cover 12 and the top surface of the top cover 11. In this way, the battery cell 60 can occupy the largest space in the height direction in the accommodating cavity 20, and the energy density of the battery 100 is improved. And a diaphragm is arranged between the two pole pieces with opposite polarities, so that the positive pole piece and the negative pole piece can be kept insulated.

It is understood that, in the embodiment of the present invention, the flat battery cell 60 has two arc-shaped sides, and the area between the two arc-shaped sides is the stacking area.

Specifically, as shown in fig. 7, the first conductive member 31 includes a first connecting plate 311 and a first bending plate 312, which are connected to each other, the first connecting plate 311 is attached to the bottom cover 12, the first bending plate 312 is located between the battery cell 60 and the annular sidewall 111, and the first tab 61 is welded to the first bending plate 312. The first connecting plate 311 and the first bending plate 312 are perpendicular to each other, so that the first bending plate 312 can be kept vertical between the end of the battery cell 60 and the annular side wall 111, the occupied space of the first bending plate 312 is the minimum, and in addition, the first bending plate 312 can be parallel to the tab, so that the two electric connections are facilitated.

In one possible embodiment, as shown in fig. 9, the first connecting plate 311 has a protrusion 3111 on a side away from the accommodating cavity 20, and the protrusion 3111 penetrates through the through hole 13. Thus, the first conductive member 31 may be electrically connected to the external electrode through the protrusion 3111.

Specifically, a first gap is provided between the outer peripheral edge of the protrusion 3111 and the hole wall of the through hole 13. The width of the first gap ranges from 0.1mm to 2mm, and the width of the first gap may specifically be 0.1mm, 0.5mm, 1.5mm or 2mm, and when the gap is smaller than 0.1mm, the distance between the protrusion 3111 and the bottom cover 12 is too close, if the first conductive member 31 is displaced or there is an assembly error, the protrusion 3111 and the bottom cover 12 are easily contacted to cause a short circuit, and when the gap is larger than 2mm, the gap between the protrusion 3111 and the bottom cover 12 is too large, which easily affects the sealing performance of the housing 10.

Further, the insulating adhesive layer 40 has an overflow portion in the first gap, so that the insulating adhesive layer 40 can be prevented from slipping on the bottom cover 12 on the one hand, and the portion of the protrusion 3111 can be adhered to prevent the protrusion 3111 from slipping, thereby causing the protrusion 3111 and the bottom cover 12 to be electrically contacted.

Note that the first gap may be filled with a seal insulator. Thus, the sealing insulator insulates the protrusion 3111 and the bottom cover 12, so that the battery 100 is less likely to be short-circuited, thereby improving the stability of the battery 100 in use.

As shown in FIG. 10, the first bending plate 312 and the annular sidewall 111 have a second spacing L2 therebetween, and the second spacing L2 is in the range of 0.2-3 mm. The second spacing L2 may be 0.2mm, 0.8mm, 1.3mm, 2mm, 2.5mm, or 3 mm. When the second distance L2 is less than 0.2mm, the difficulty in assembling the first conductive member 31 and the battery cell 60 is increased. When the pitch is larger than 3mm, the overall size of the battery 100 is increased, which is disadvantageous in downsizing the battery 100.

In one possible embodiment, a first insulating layer (not shown) is disposed between the first bending plate 312 and the battery core 60, and a second insulating layer 50 is disposed between the first bending plate 312 and the annular sidewall 111. In this way, insulation can be maintained between the first bending plate 312 and the top case 11, and between the first bending plate 312 and the battery cell 60, so as to prevent the first conductive member 31 from short-circuiting.

In one possible embodiment, as shown in fig. 7, a second conductive member 32 is disposed in the receiving cavity 20, at least a portion of the second conductive member 32 is located between the second tab 62 and the casing 10, and electrically connects the second tab 62 and the casing 10. The second conductive member 32 and the first conductive member 31 are insulated from each other. Thus, a portion of second conductive member 32 is disposed between second pole ear 62 and annular sidewall 111 to electrically connect second pole ear 62 to annular sidewall 111.

It should be noted that, in the embodiment of the present invention, the first conductive element 31 and the second conductive element 32 may be collectively referred to as a conductive element 30, and the conductive element 30 mainly functions to electrically connect the tab of the battery cell 60 with the casing 10 or the external electrode.

Specifically, the second conductive member 32 includes a second connecting plate 321 and a second bending plate 322 that are connected to each other, the second connecting plate 321 is attached to the bottom cover 12, the second bending plate 322 is located between the battery cell 60 and the annular side wall 111, and the second tab 62 is welded to the second bending plate 322.

It should be noted that, during specific assembly, the first tab 61 is welded on the first bending plate 312, and the second tab 62 is welded on the second bending plate 322, so that the housing 10 can be welded before assembly, which is beneficial to reducing the processing difficulty of the battery 100, and meanwhile, the second tab 62 is welded with the annular sidewall 111 through the second bending plate 322, that is, the second tab 62 is indirectly fixed on the annular sidewall 111, compared with the case where the second tab 62 is directly welded with the annular sidewall 111, the fixing manner is not easy to weld through the tab during welding.

It should be noted that, the shapes of the first connecting plate 311 and the second connecting plate 321 may be the same or different, and the specific shape may be a regular shape or an irregular shape, which is not limited in the embodiment of the present invention.

In one possible embodiment, the height difference between the first connecting plate 311 and the second connecting plate 321 is less than 0.3mm, so that the first connecting plate 311 and the second connecting plate 321 can be located on the same plane as much as possible, and the energy density of the battery cell 60 can be maximized as much as possible.

As shown in fig. 7, the first connection plate 311 and the second connection plate 321 have a second gap in the horizontal direction. The width L of the second gap is between 0.5mm and 5mm, and the width L may be 0.5mm, 1mm, 2mm, 3mm, 4mm or 5mm, when the width L is less than 0.5mm, the first conductive member 31 and the second conductive member 32 are too close to each other, if the conductive members 30 deviate or there is an error in assembly, the first conductive member 31 is likely to contact with the second conductive member 32 to cause a short circuit, and when the width L is greater than 5mm, the width L between the first conductive member 31 and the second conductive member 32 is too large, so that the contact area between the conductive member 30 and the bottom cover 12 is too small, which affects the assembly stability of the conductive member 30.

In one possible embodiment, the second gap may be filled with a porous insulator (not shown). The first conductive member 31 may be insulated from the second conductive member 32, and the electrolyte may be stored.

In the embodiment of the present invention, the first tab 61 and the second tab 62 are located at the same end of the battery cell 60. The first bending plate and the second bending plate 322 are located at the same end of the battery cell 60. The first tab 61 is located on a side of the first bending plate 312 facing away from the battery cell 60, and the second tab 62 is located on a side of the second bending plate 322 facing away from the battery cell 60. Thus, welding and assembly of the battery 100 are facilitated.

In the embodiment of the present invention, the first tab 61 is a positive tab, the second tab 62 is a negative tab, the casing 10 is electrically connected to the second conductive piece 32, the casing 10 is a negative electrode as a whole, the first conductive piece 31 is a positive electrode, it can be understood that after the tab of the battery cell 60 is exchanged with the electrical connection mode of the first conductive piece 31 and the second conductive piece 32, the casing 10 is a positive electrode as a whole, and the first conductive piece 31 is a negative electrode.

In an implementation, as shown in fig. 10, 13 and 14, a third insulating layer 70 is further included, where the third insulating layer 70 is located between the battery cell 60 and the first conductive member 31, and between the battery cell 60 and the second conductive member 32. Thus, the conductive member 30 is prevented from being electrically contacted with the battery cell 60, and a short circuit is prevented from occurring. It should be noted that the third insulating layer 70 may include three portions, a first portion is located between the tab and the end of the battery cell 60, a second portion is located between the battery cell 60 and the connecting plate, and a third portion is located at the tail of the battery cell 60.

In one possible embodiment, a third distance is provided between the end of the first tab 61 and the end of the second tab 62, and the third distance is greater than or equal to 0mm and less than 1 mm. In this way, the end portions of the first tab 61 and the second tab 62 can be flush as much as possible, and the difficulty in assembling the first tab 61 and the second tab 62 is reduced. The end of the first tab 61 refers to the end of the first tab 61 near the annular sidewall 111, and the end of the second tab 62 refers to the end of the second tab 62 near the annular sidewall 111.

In one possible embodiment, the area of the first connecting plate 311 is larger than that of the second connecting plate 321, and the ratio of the areas of the first connecting plate 311 and the second connecting plate 321 ranges from 1 to 9.9. Specifically, the area of the first connection plate 311 may be 1, 3, 7, or 9.9 times the area of the second connection plate 321. Thus, the arrangement of the first conductive member 31 and the second conductive member 32 can be diversified, which is advantageous for the arrangement of the conductive member 30.

In one possible embodiment, the annular side wall 111 is provided with the reinforcing sheet 14 and the liquid inlet 15 at an interval, and the liquid inlet 15 communicates with the outside of the casing 10 and the accommodating chamber 20. Like this, can weld through strengthening piece 14 and external electrode, can avoid damaging casing 10, annotate liquid mouth 15 through the setting and can conveniently pour into electrolyte into, in addition, annotate and be provided with seal plate 16 on the liquid mouth 15, like this, after pouring into electrolyte into, can adopt seal plate 16 to seal and annotate liquid mouth 15, avoid battery 100 weeping. The top cover 112 may further have a pressure relief groove 17, and the pressure relief groove 17 is disposed near the first tab 61 or the second tab 62, so as to facilitate pressure relief of the battery 100 and prevent explosion of the battery 100. It should be noted that the top cover 112 may be thinned to form the pressure relief groove 17, and the shape of the pressure relief groove 17 may be "L" shape, "O" shape, or other shapes.

Specifically, a terminating adhesive (not shown) is further disposed on the battery cell 60, and the terminating adhesive is located on a pole piece plane close to the top cover 112 and contacts with an inner wall surface of the top cover 112, so that the battery cell 60 can be conveniently assembled, and the battery cell 60 is not prone to bonding failure at the terminating adhesive.

It should be noted that, since the housing 10 is a negative electrode, the position of the reinforcing plate 14 can be adjusted according to the position of the external negative electrode, and the reinforcing plate 14 is disposed close to the external negative electrode to facilitate welding, it can be understood that the reinforcing plate 14 and the second tab 62 are disposed at two opposite sides of the annular side wall 111 to facilitate welding, and welding through the annular side wall 111 and the second tab 62 during welding can be avoided.

As shown in fig. 11 and 12, an embodiment of the present invention provides another battery, in which the second tab 62 of the battery 100 is welded to the annular sidewall 111, a supporting plate 19 may be disposed in an area of the bottom cover 12 where the first conductive element 31 is not disposed, and an upper surface of the supporting plate 19 and an upper surface of a connecting plate of the first conductive element 31 may be flush with each other, so as to ensure that a lower surface of the battery cell 60 can have a complete supporting surface, so that the battery cell 60 can maintain a stable state.

It should be noted that, the second tab 62 is directly fixed on the annular sidewall 111 by welding, so that the battery cell 60 can be effectively prevented from sliding in the accommodating cavity 20, and the stability of the battery 100 is improved. And the distance between the first tab 61 and the annular side wall 111 is greater than the distance between the second tab 62 and the annular side wall 111, so that the first tab 61 and the annular side wall 111 can be prevented from contacting, and the battery 100 can be prevented from short-circuiting.

Other technical features of the battery 100 are the same as those of the first battery, and are not described herein.

In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are intended to be construed broadly, e.g., to mean 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. 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 merely for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular 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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A battery is characterized by comprising a conductive shell and a battery cell, wherein the shell comprises a top shell and a bottom cover, the top shell comprises a top cover and an annular side wall connected to the top cover, the top shell covers the bottom cover and jointly forms an accommodating cavity, and the battery cell is positioned in the accommodating cavity;

a first conductive piece is arranged in the accommodating cavity, an insulating bonding layer is arranged between the first conductive piece and the bottom cover, and the insulating bonding layer is connected with the first conductive piece and the bottom cover; a through hole is formed in the bottom cover, and the first conductive piece covers the through hole; the edge of one side of the annular side wall close to the bottom cover is welded with the bottom cover to form a circle of welding mark;

2. The battery of claim 1, wherein the solder stamp and the insulating adhesive layer have a first spacing therebetween, the first spacing having a width greater than or equal to 3 times a width of the solder stamp.

3. The battery of claim 1, wherein the annular side wall has a flange at a side edge adjacent to the bottom cover, the flange is welded to the bottom cover and forms a ring of the welding stamp around the outer periphery of the annular side wall.

4. The battery of claim 1, wherein the width of the solder mark is greater than 0mm and equal to or less than 1 mm.

5. The battery of claim 1, wherein a ratio of a covered area of the first conductive member on the bottom cover to an area of the bottom cover is 0.4-0.99.

6. The battery of claim 1, wherein the cell comprises at least two pole pieces with opposite polarities, the cell has a stacking region, at least two of the pole pieces in the stacking region are stacked on each other, and the pole pieces in the stacking region are parallel to a surface of the bottom cover and/or a top surface of the top cover; and a diaphragm is arranged between the two pole pieces with opposite polarities.

7. The battery of any of claims 1-6, wherein the first conductive member comprises a first connecting plate and a first bending plate connected to each other, the first connecting plate is attached to the bottom cover, the first bending plate is located between the cell and the annular sidewall, and the first tab is welded to the first bending plate.

8. The battery of claim 7, wherein the first connecting plate has a protrusion on a side away from the receiving cavity, and the protrusion penetrates through the through hole.

9. The battery of claim 8, wherein a first gap is provided between an outer periphery of the protrusion and a wall of the through hole; the width of the first gap ranges from 0.1mm to 2 mm; the insulating adhesive layer has an overflow portion located in the first gap.

10. The battery of claim 9, wherein the first gap is filled with a sealing insulator.

11. The cell defined in claim 7, wherein the first bend plate and the annular sidewall have a second spacing therebetween in the range of 0.2-3 mm.

12. The battery of claim 7, wherein a first insulating layer is disposed between the first bending plate and the cell core, and/or a second insulating layer is disposed between the first bending plate and the annular sidewall.

13. The battery of any of claims 1-6, wherein the second tab is welded to the annular sidewall.

14. The cell defined in claim 13, wherein a distance between the first tab and the annular sidewall is greater than a distance between the second tab and the annular sidewall.

15. The battery of claim 7, wherein a second conductive member is disposed in the receiving cavity, and at least a portion of the second conductive member is located between the second tab and the case and electrically connects the second tab and the case;

16. The battery of claim 15, wherein the second conductive member comprises a second connecting plate and a second bending plate connected to each other, the second connecting plate is attached to the bottom cover, the second bending plate is located between the battery cell and the annular sidewall, and the second tab is welded to the second bending plate.

17. The battery of claim 16, wherein the difference in height of the first and second connection plates is less than 0.3 mm;

a second gap is formed between the first connecting plate and the second connecting plate;

the width of the second gap ranges from 0.5mm to 5mm, and/or the second gap is filled with a porous insulating piece.

18. The battery of claim 16, wherein the first tab and the second tab are located at a same end of the cell; the first bending plate and the second bending plate are located at the same end of the battery core.

19. The battery of claim 16, wherein the first tab is located on a side of the first bending plate facing away from the cell, and/or wherein the second tab is located on a side of the second bending plate facing away from the cell.

20. The battery of claim 16, further comprising a third insulating layer between the cell and the first electrically conductive member and between the cell and the second electrically conductive member.

21. The battery of any of claims 15-20 wherein the end of the first tab and the end of the second tab have a third spacing therebetween, the third spacing being greater than or equal to 0mm and less than or equal to 1 mm.

22. The battery of any of claims 16-20, wherein the area of the first connecting plate is greater than the area of the second connecting plate, and the ratio of the areas of the first and second connecting plates ranges from 1-9.9.

23. The battery of any one of claims 1-6, wherein the annular side wall is provided with a reinforcement sheet and a liquid injection port at intervals, the reinforcement sheet and the second tab are positioned at two opposite sides of the annular side wall, and the liquid injection port is communicated with the outer part of the shell and the accommodating cavity; a pressure relief groove is formed in the top cover and is arranged close to the first pole lug or the second pole lug;

the liquid injection port is provided with a sealing sheet which seals the liquid injection port;

and/or a final closing adhesive is further arranged on the battery cell and is positioned on one side, close to the top cover, of the battery cell.