CN217334339U - Battery with a battery cell - Google Patents

Abstract

The utility model provides a battery, include: a housing; the top cover is covered on the shell and forms a cavity together with the shell; the top cover comprises a second conductive piece connected with the shell and a first conductive piece positioned on one side of the second conductive piece, which deviates from the cavity; the battery cell is positioned in the cavity; the battery cell is provided with a first tab electrically connected with the first conductive piece; and the first transfer piece is positioned on one side of the second conductive piece, which deviates from the cavity, and is connected with the first conductive piece, and one surface of the first transfer piece, which deviates from the cavity, does not exceed one surface of the first conductive piece, which deviates from the cavity, in the direction from the cavity to the top cover. The utility model discloses can improve the performance such as energy density of battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery belongs to electrochemistry energy memory field.

Background

Batteries are common electrochemical energy storage devices and have been widely used in industries such as digital electronics. With the development of technology, the requirements for the performance of the battery, such as energy density, are also increasing, and therefore, the improvement of the performance of the battery, such as energy density, is urgently needed.

The battery PACK generally refers to the packaging, assembly and the like of a battery, is an indispensable part of the battery, and is an important factor influencing the performance such as the energy density of the battery, and particularly, the battery has a cell and a PACK structure for packaging the cell, the cell includes a positive plate, a diaphragm, a negative plate, a positive tab connected with the positive plate, and a negative tab connected with the negative plate, the PACK structure is provided with a positive adapter and a negative adapter, the positive adapter is electrically connected with the positive tab, the negative adapter is electrically connected with the negative tab, so as to realize the connection of the positive adapter and the negative adapter as the internal circuit of the battery and the peripheral circuit, however, in the battery PACK structure, the adapter is usually welded above a housing cover, for example, on a sealing member (or called a sealing sheet/sealing nail) for sealing a liquid injection hole, thereby increasing the height and the volume of the battery, reducing the energy density of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery can improve the performance such as energy density of battery, effectively overcomes the defect that prior art exists.

An aspect of the present invention provides a battery, including: a housing; the top cover is covered on the shell and forms a cavity together with the shell; the top cover comprises a second conductive piece connected with the shell and a first conductive piece positioned on one side of the second conductive piece, which is far away from the cavity; the battery cell is positioned in the cavity; the battery cell is provided with a first tab electrically connected with the first conductive piece; and the first adapter piece is positioned on one side of the second conductive piece, which deviates from the cavity, and is connected with the first conductive piece, and one surface of the first adapter piece, which deviates from the cavity, does not exceed one surface of the first conductive piece, which deviates from the cavity, in the direction from the cavity to the top cover.

According to an embodiment of the present invention, a first insulating layer is disposed between the first conductive component and the second conductive component.

According to an embodiment of the present invention, the projection of the first insulating layer on the second conductive member covers the projection of the first conductive member on the second conductive member.

According to an embodiment of the present invention, the second conductive component faces the one side of the cavity is provided with a fourth insulating layer.

According to an embodiment of the present invention, a surface of the first adapting piece connected to the first conductive piece is parallel to a direction from the top cover to the cavity; and/or the first switching piece comprises a first switching piece connected with the first conductive piece, and the projection of the first switching piece on the plane of the surface of the second conductive piece is at least partially positioned in the projection of the second conductive piece on the plane of the surface of the second conductive piece; and/or the first adapter is welded with the first conductive piece; and/or a second insulating layer is arranged between the first adapting piece and the second conducting piece.

According to the utility model discloses an embodiment, first electrically conductive piece be equipped with the first bellying that first adaptor piece is connected, first bellying is located first electrically conductive piece deviates from one side of cavity, perhaps, locate first electrically conductive piece towards one side of first adaptor piece.

According to the utility model discloses an embodiment, first adaptor includes consecutive first adaptor piece, first switching portion and first pin, first adaptor piece with first electrically conductive piece is connected, first switching portion follows the lateral wall of casing extends, first pin is along keeping away from the direction of the lateral wall of casing extends.

According to the utility model discloses an embodiment, first switching portion with be equipped with the third insulating layer between the casing.

According to an embodiment of the present invention, the battery cell is further provided with a second tab having a polarity opposite to that of the first tab, and the second tab is electrically connected to the second conductive member; the battery also comprises a second adapter piece which is positioned on one side of the second conductive piece, which deviates from the cavity, and is connected with the second conductive piece, and one surface of the second adapter piece, which deviates from the cavity, is not more than one surface of the first conductive piece, which deviates from the cavity, along the direction from the cavity to the top cover.

According to an embodiment of the present invention, the second adaptor and the first adaptor are respectively located at two opposite sides of the first conductive member; and/or the second adapter part is welded with the second conductive part; and/or the second adapter piece comprises a second adapter piece, a second adapter part and a second pin which are sequentially connected, the second adapter piece is connected with the second conductive piece, the second adapter part extends along the side wall of the shell, and the second pin extends along the direction far away from the side wall of the shell.

The utility model discloses in, the one side that first switching piece deviates from the electrically conductive piece of second is no longer than (not higher than) the one side that first electrically conductive piece deviates from the electrically conductive piece of second, from this, can practice thrift shared space in the battery direction of height, reduces the height and the volume of battery, improves the energy density of battery.

In addition, compare in prior art with first adaptor overlap joint on the sealing member that is used for sealed notes liquid hole, the utility model discloses be connected first adaptor with the leading junction part of first electrically conductive piece, the welding area is bigger, does not confine the size of sealing member to easy location to can avoid because the sealing member size is little and the location difficulty that leads to, the location is inaccurate and the welding that leads to from this is bad, the battery performance is poor and make defects such as the yield is low.

Therefore, the utility model discloses can improve the performance such as energy density, leakproofness, security and the stability of battery, the process flow is simplified in the preparation of the battery of being convenient for simultaneously, reduces the function time of battery manufacture equipment, and reduce cost improves the production efficiency and the preparation yield of battery.

Drawings

Fig. 1 is a schematic diagram of a battery structure according to an embodiment of the present invention;

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

fig. 3 is a schematic view of a top cover structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a first conductive member according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a battery according to an embodiment of the present invention when the top cover is not covered;

fig. 6 is a schematic structural view of a battery according to an embodiment of the present invention when an adaptor is not welded;

fig. 7 is a schematic structural diagram of a first adapter according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a first adapter according to another embodiment of the present invention;

fig. 9 is a schematic structural view of a first adapter according to another embodiment of the present invention;

fig. 10 is a cross-sectional view of a battery according to an embodiment of the present invention;

fig. 11 is a schematic view illustrating a welding of a first connecting member and a first conductive member according to an embodiment of the present invention.

Description of reference numerals: 1: a housing; 11: a third insulating layer; 2: an electric core; 21: a first tab; 22: a second tab; 31: a first conductive member; 310: a first bore section; 311: a boss; 3111: a main body portion; 3112: a first boss portion; 312: a lead-in part; 313: a second bore section; 314: a groove; 32: a second conductive member; 320: a second through hole; 33: a first insulating layer; 330: a third through hole; 34: a second insulating layer; 35: a fourth insulating layer; 350: a fourth via hole; 41: a first transfer tab; 42: a first transition portion; 43: a first pin; 44: a first arc transition; 45: a second smooth transition portion; 411: a first connection portion; 412: a second connecting portion; 51: a second patch; 52: a second transfer part; 53: a second pin; 54: a third arc transition portion; 55: a fourth arc transition; f: a laser beam.

Detailed Description

The present invention is described in further detail below in order to enable those skilled in the art to better understand the solution of the present invention. The following detailed description is merely illustrative of the principles and features of the present invention, and the examples are intended to be illustrative of the invention and are not intended to limit the scope of the invention. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be connected directly or indirectly through an intermediate medium, or the two elements may be connected to each other. The above-described meaning of what is specifically intended in the present invention can be understood in specific instances by those of ordinary skill in the art. Furthermore, the terms "first", "second", "third", "fourth", and the like are used for descriptive purposes only, such as to distinguish various components for clarity of explanation/explanation of the technical solution, and are not to be construed as indicating or implying any number or order of the indicated technical features.

An embodiment of the utility model provides a battery, as shown in fig. 1 to fig. 11, this battery includes: a housing 1; the top cover is covered on the shell 1 and forms a cavity together with the shell; the top cover comprises a second conductive piece 32 connected with the shell and a first conductive piece 31 positioned on one side of the second conductive piece 32, which is far away from the cavity; the battery cell 2 is positioned in the cavity, and the battery cell 2 is provided with a first tab 21 electrically connected with the first conductive part 31; and the first adapter piece is positioned on one side of the second conductive piece 32 departing from the cavity and connected with the first conductive piece 31, and one surface of the first adapter piece departing from the cavity does not exceed one surface of the first conductive piece 31 departing from the cavity in the direction from the cavity to the top cover.

Wherein, first adaptor is as the connecting piece of battery and peripheral circuit, be connected with the first utmost point ear 21 that is located the electric core 2 of cavity through first electrically conductive piece, with intercommunication battery inner circuit and peripheral circuit (if the circuit of the electronic product of this battery of installation), its one side that deviates from the cavity is no longer than the one side that first electrically conductive piece 31 deviates from the cavity, use the one side that second electrically conductive piece 32 deviates from the cavity promptly as the benchmark, the one side that first adaptor deviates from second electrically conductive piece 32 is not higher than the one side that first electrically conductive piece 31 deviates from second electrically conductive piece 32, thereby can practice thrift the space in the battery direction of height, improve the energy density of battery.

Specifically, the battery may be a button battery (or called button battery), and the battery cell 2 may be a winding battery cell (winding core)/or a laminated battery cell. For example, as shown in fig. 2, 5, 6, and 10, the battery cell 2 is a winding core.

The housing 1 includes a side wall and a bottom wall, the top cover is connected to the upper end of the side wall of the housing 1 (specifically, the outer periphery of the second conductive member 32 is connected to the housing 1), and the bottom wall of the housing 1 is connected to the lower end of the side wall, thereby enclosing a cavity. Wherein, the side wall and the bottom wall of the housing 1 can be integrally formed, but not limited thereto.

As shown in fig. 5, 6 and 10, the battery cell 2 is further provided with a second tab 22 having a polarity opposite to that of the first tab 21, and the second tab 22 is connected to the casing.

The second tab 22 may specifically be connected to the bottom wall of the casing 1, and in some embodiments, as shown in fig. 10, the second tab 22 is led out from the battery cell 2 and bent to fit on the bottom wall of the casing 1, that is, the second tab 22 includes an extension portion extending along the bottom wall of the casing 1, and the extension portion fits on the bottom wall of the casing 1 (that is, the extension portion is stacked and connected to the bottom wall of the casing 1), so that the second tab 22 is connected to the casing 1, and specifically, may be welded.

Specifically, the battery cell 2 includes a plurality of electrode plates arranged in a stacked manner, each electrode plate includes a first electrode plate and a second electrode plate with a polarity opposite to that of the first electrode plate, a diaphragm is arranged between the first electrode plate and the second electrode plate, that is, the first electrode plate, the diaphragm and the second electrode plate are arranged in a stacked manner, and the first electrode plate and the second electrode plate are separated by the diaphragm to prevent the first electrode plate and the second electrode plate from contacting with each other and causing short circuit. The first electrode sheet comprises a first current collector, a first tab 21 is disposed on the first current collector, the second electrode sheet comprises a second current collector, and a second tab 22 is disposed on the second current collector.

The first electrode plate is a positive plate, the first tab 21 is a positive tab, the second electrode plate is a negative plate, and the second tab 22 is a negative tab; or, the first electrode sheet is a negative electrode sheet, the first tab 21 is a negative electrode sheet, the second electrode sheet is a positive electrode sheet, and the second tab 22 is a positive electrode sheet.

The first tab 21 and the second tab 22 are respectively disposed at two opposite ends of the battery cell 2, that is, the first tab 21 is disposed at one end (a first end surface) of the battery cell 2 facing the top cover, and the second tab 22 is disposed at one end (a second end surface) of the battery cell 2 facing the bottom wall of the casing 1.

Specifically, the battery cell 2 has a first end face and a second end face that are opposite to each other, and the first end face and the second end face are end faces that expose the outer edges of the electrode sheets (first electrode sheet/second electrode sheet), and are formed by end faces perpendicular to the thickness direction of the first electrode sheet, the separator, and the second electrode sheet that are stacked.

Generally, a first insulating adhesive layer is disposed on a first end surface of the battery cell 2, a second insulating adhesive layer is disposed on a second end surface of the battery cell 2, and the second insulating adhesive layer may be specifically located between the extension portion of the second tab 22 and the battery cell 2.

As shown in fig. 1 to 4 and 10, the first conductive member 31 includes a connection portion 312 connected to the first adapting member, and a boss 311 connected to the connection portion 312, wherein the boss 311 extends toward the cavity and is connected to the first tab 21, and specifically, the boss 311 is connected to the first tab on a side facing the cavity, so as to electrically connect the first conductive member 31 to the first tab 21.

Specifically, the connecting part 312 is located on a side of the second conductive member 32 away from the cavity and connected to the first connecting member; the lead-in portion 312 may be disposed around the circumference of the boss 311, i.e. in a projection of the top cover perpendicular to a direction from the cavity to the top cover, the lead-in portion 312 surrounds the boss 311.

In addition, in the direction from the cavity to the top cover, with the surface of the second conductive member departing from the cavity as a reference, the surface of the first adapting member facing the second conductive member is higher than the surface of the first conductive member 31/the surface of the conductive connecting portion 312 facing the cavity (i.e. the surface of the conductive connecting portion 312 facing the second conductive member 32), so that the short circuit caused by the contact between the first adapting member and the second conductive member 32 can be avoided, and the safety performance of the battery can be further improved.

As shown in fig. 11, the first conductive member 31 is provided with a first protrusion 3112 connected to the first adapting member, and the first protrusion 3112 may be provided on the guiding part 312. Specifically, the guiding portion 312 includes a main body portion 3111 and a first protrusion portion 3112 connected to the first adapting member, and a distance from the first protrusion portion 3112 to the second conductive member 32 is greater than a distance from the main body portion 3111 to the second conductive member 32.

Specifically, as shown in fig. 11 a, the first protrusion 3112 is provided on a side of the first conductive member 31/the guide connecting portion 312 facing away from the second conductive member 32 (the first protrusion 3112 extends in a direction facing away from the second conductive member 32), and a surface thereof close to the first connecting member (a surface where the first protrusion 3112 and the second protrusion meet) is flush with a surface of the main body portion 3111 close to the first connecting member; alternatively, as shown in fig. 11B, the first protruding portion 3112 is disposed on a side of the first conductive member 31/the guiding connection portion 312 facing the first adapting unit (the first protruding portion 3112 extends towards the first adapting unit), a surface of the first protruding portion 3112 facing away from the second conductive member 32 is flush with a surface of the main body portion 3111 facing away from the second conductive member 32, and a distance from the first protruding portion 3112 to the second conductive member 32 is greater than a distance from the main body portion 3111 to the second conductive member 32 in a direction from the cavity to the top cover.

As shown in fig. 1 to 3 and 10, the second conductive member 32 may be annular and have a second through hole 320, and the boss 311 of the first conductive member 31 penetrates through the second through hole 320, so that the second conductive member 32 is annularly disposed outside the boss 311. The inner diameter of the second conductive member 32 is larger than the outer diameter of the boss 311, so that a gap exists between the second conductive member and the boss, and the first conductive member 31 and the second conductive member 32 are prevented from contacting and short-circuiting.

In addition, a first insulating layer 33 is disposed between the first conductive member 31 and the second conductive member 32, and the first insulating layer 33 may be specifically located between the connecting portion 312 and the second conductive member 32. The first insulating layer 33 serves to connect and insulate the first conductive member 31 and the second conductive member 32, and the first insulating layer 33 bonds and insulates the first conductive member and the second conductive member.

In specific implementation, the top cover may be formed by stacking the second conductive member 32, the first insulating glue, and the conductive connection portion 312 of the first conductive member 31 in sequence, and then performing hot-pressing and compounding, and a conventional hot-pressing mechanism in the art may be used to perform hot-pressing, without limitation, after the hot-pressing and compounding, the first insulating glue forms the first insulating layer 33, and the deformation amount of the first insulating glue is generally 40% to 80%.

Specifically, the first insulating layer 33 is disposed around the outer side of the boss 311, and the shape of the first insulating layer 33 matches the shape of the first conductive member 31, as shown in fig. 2, fig. 3 and fig. 10, the first insulating layer 33 has a third through hole 330, and the boss 311 of the first conductive member 31 penetrates through the third through hole 330 (which is equivalent to the boss 311 penetrates through the first insulating layer 33), so that the first insulating layer 33 is disposed around the outer side of the boss 311.

As shown in fig. 1, fig. 6 and fig. 10, the projection of the first insulating layer 33 on the second conductive member 32 covers the projection of the first conductive member on the second conductive member, specifically covers the projection of the connecting portion 312 on the second conductive member 32, and the projections thereof are overlapped, for example, or the projection area of the first conductive member/connecting portion 312 on the second conductive member is smaller than the projection area of the first insulating layer 33 on the second conductive member 32 and is located in the projection of the first insulating layer 33 on the second conductive member 32, which is beneficial to further preventing the first conductive member 31 and the second conductive member 32 from contacting and shorting, and improving the safety of the battery.

As shown in fig. 1, a fourth insulating layer 35 (or cap end surface insulating glue) is disposed on a side of the second conductive member 32 facing the cavity, so as to prevent a tab of the battery cell 2 from contacting the second conductive member 32 and the first conductive member 31 to cause a short circuit, for example, prevent the first tab 21 from contacting the second conductive member 32.

The fourth insulation layer 35 may be disposed around the outer side of the boss 311, and for example, the fourth insulation layer 35 may be annular and has a fourth through hole 350, and the boss 311 is at least partially located in the fourth through hole 350. The outer diameter of the fourth insulating layer 35 may be smaller than the outer diameter of the second conductive member 32, and the inner diameter of the fourth insulating layer 35 may be equal to the outer diameter of the boss 311.

In some embodiments, the thickness of the fourth insulating layer 35 may be 0.03mm to 0.15mm, such as 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.15mm, and the like.

Specifically, the first conductive member 31 (the boss 311/the conductive connection portion 312), the first insulating layer 33, the second conductive member 32, and the fourth insulating layer 35 may be concentrically disposed, and the first through hole, the second through hole 320, the third through hole 330, and the fourth through hole 350 may be coaxially disposed.

As shown in fig. 1, 2 and 10, the first connecting member includes a first connecting piece 41 connected to the first conductive member 31, the first connecting piece 41 is located on a side of the second conductive member 32 facing away from the cavity, and has one end connected to the connecting portion 312 and the other end extending toward the outer edge of the top cover. The first connecting piece 41 is connected to the conductive portion 312 of the first conductive member 31, so as to connect the first connecting piece to the first conductive member 31.

The projection of the first rotating connecting piece 41 on the plane of the surface of the second conductive member 32 is at least partially (i.e. partially or completely) located in the projection of the second conductive member 32 on the plane of the surface of the second conductive member 32, and generally, the first rotating connecting piece 41 does not substantially extend out of the outer edge of the second conductive member 32 (i.e. the projection of the first rotating connecting piece 41 on the plane of the surface of the second conductive member 32 is located in the projection of the second conductive member 32 on the plane of the surface of the second conductive member 32), which is beneficial to saving space in the radial direction of the battery and further improving the energy density and other properties of the battery.

Specifically, the first conductive member 31 is provided with a first notch corresponding to the position of the first rotating contact piece 41, and the first notch penetrates through the first conductive member 31 in the thickness direction of the first conductive member 31, specifically, penetrates through the conductive connection portion 312, that is, the first insulating layer 33 is exposed through the first notch; in the radial direction of the battery (the radial direction of the battery is perpendicular to the direction from the top cover to the cavity), the first notch is located between the first conductive member 31/guiding connection portion 312 and the outer periphery of the second conductive member 32 (also the outer periphery of the top cover), and the first rotation tab 41 is disposed in the first notch to connect with the first conductive member 31. For example, as shown in fig. 1 to 3 and 6, a projection of the first notch on the second conductive member 32 may be a semicircle, and a length of a connection line between two ends of the semicircle may be equal to a length of a side edge of the first conductive member 31/the side of the guide connecting portion 312 facing the first rotating tab 41.

As shown in fig. 1, 2, and 7 to 10, the first adapter further includes a first pin 43 connected to the first adapter sheet 41, the first pin 43 may be located on a side wall of the housing 1, and the first pin 43 may not only serve as a connector for connecting the battery to a peripheral circuit (for example, connecting to an electronic product), but also provide a positioning function for installing the battery.

In some embodiments, the first adapter includes a first adapter sheet 41, a first adapter portion 42 and a first pin 43 connected in sequence, the first adapter portion 42 extends along the side wall of the housing 1, and the first pin 43 extends in a direction away from the side wall of the housing 1.

Specifically, the first junction piece has a multi-fold structure, a cross section of the first pin 43 perpendicular to the thickness direction of the first pin 43 is parallel to a cross section of the first junction piece 41 perpendicular to the thickness direction of the first junction piece 41, and a cross section of the first junction piece 42 perpendicular to the thickness direction of the first junction piece 42 is perpendicular to a cross section of the first junction piece 41 perpendicular to the thickness direction of the first junction piece 41.

Furthermore, the first rotating contact piece 41 and the first rotating connection portion 42 may be connected by a first arc transition portion 44, that is, the connection point between the two may be transited by an arc; the first transition portion 42 and the first lead 43 may be connected by a second arc transition portion 45, that is, the first transition portion and the first lead may transition through an arc.

In some embodiments, as shown in fig. 7, the widths of the first rotating plate 41, the first rotating part 42 and the first pin 43 in the width direction of the first rotating plate 41 are the same.

In other embodiments, as shown in fig. 8, the first connection piece 41 includes a first connection portion 411 and a second connection portion 412, one end of the first connection portion 411 is connected to the guide connection portion 312, the other end is connected to one end of the second connection portion 412, and the other end of the second connection portion 412 is connected to the first transfer portion 42; in a direction from an end of the second connection portion 412 contacting the first connection portion 411 to an end of the second connection portion 412 contacting the first transfer portion 42, the width of the second connection portion 412 is gradually reduced until the width is the same as the width of the first transfer portion 42, the width of the end of the second connection portion 412 contacting the first transfer sheet 41 is the same as the width of the first transfer piece, and the width of the end of the second connection portion 412 contacting the first transfer portion 42 is the same as the width of the first transfer portion 42.

In other embodiments, as shown in fig. 9, the second connection portion 412 protrudes upward relative to the first connection portion 411, that is, a surface of the second conductive member 32 facing away from the cavity is taken as a reference, and a surface of the second connection portion 412 facing the second conductive member 32 is higher than a surface of the first connection portion 411 facing the second conductive member 32.

As shown in fig. 1, fig. 2 and fig. 10, a third insulating layer 11 (or called shell insulating glue) is disposed between the first transfer part 42 and the casing 1, so that a short circuit caused by contact between the first transfer part and the casing 1 can be avoided, and the safety and other performances of the battery can be further improved.

In some embodiments, a second insulating layer 34 is disposed between the first connecting member and the second conductive member 32, and the second insulating layer 34 is specifically located between the first connecting member 41 and the second conductive member 32, so as to further prevent the first connecting member from contacting the second conductive member 32, thereby improving the safety of the battery.

Illustratively, the second insulating layer 34 is semi-circular (semi-circular glue) with a diameter no greater than the outer diameter of the second conductive member 32.

In some embodiments, the thickness of the second insulating layer 34 is 0.03mm to 0.15mm, such as 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, and the like.

As shown in fig. 1, 2 and 10, a surface of the first adapting member, which is connected to the first conductive member 31/the conductive connecting portion 312, is parallel to a direction from the cavity to the top cover (i.e., a direction from the second conductive member 32 to the conductive connecting portion 312 and a thickness direction of the conductive connecting portion 312), that is, the first adapting member is connected to a side surface of the conductive connecting portion 312, which is parallel to the thickness direction of the conductive connecting portion 312, specifically, by welding, so that not only is the surface of the first adapting member facing away from the cavity not more than the surface of the first conductive member 31 facing away from the cavity, but also the first insulating layer 33 and/or the second insulating layer 34 are prevented from being subjected to sol during welding, and adverse effects on the sealing and safety performance of the battery caused by the sol are avoided, relative to the first adapting member being welded to the side of the first conductive member 31 facing away from the cavity.

As shown in fig. 1 to 4, 6 and 10, the boss 311 is provided with a first through-hole communicating with the cavity, and the battery further includes a sealing member sealing the first through-hole. The first through hole can regard as annotates the liquid hole for to pouring into electrolyte in the cavity, annotate the liquid completion back, annotate the liquid hole with the gasket seal, guarantee the sealing performance of battery.

The sealing member may be a sheet (sealing sheet), and specifically may include a metal sheet, and the material of the metal sheet is, for example, aluminum or an aluminum alloy.

Specifically, the sealing element is located on one side of the boss 311 departing from the cavity, and along the direction from the cavity to the top cover, a surface of the sealing element departing from the cavity does not exceed a surface of the conductive part 312 departing from the cavity (i.e., a surface departing from the second conductive part 32).

Generally, a surface of the boss 311 facing away from the cavity does not exceed a surface of the conducting portion 312 facing away from the cavity (i.e., a surface of the boss 311 facing away from the cavity is not higher than a surface of the conducting portion 312 facing away from the cavity with reference to a surface of the second conductive member 32 facing away from the cavity).

In some embodiments, as shown in fig. 1 to fig. 3, fig. 6 and fig. 10, the first conductive member 31 is provided with a groove 314 (or a counter bore) located on a side of the boss 311 facing away from the cavity, and the sealing member is disposed in the groove 314 and does not extend out of an opening of the groove 314, so that a surface of the sealing member facing away from the cavity does not exceed a surface of the conductive connecting portion 312 facing away from the cavity.

Wherein, the groove 314 is communicated with the first through hole, and the sealing element covers the first through hole and is connected with the boss, which may be specifically welded, so as to realize sealing the first through hole.

Optionally, the depth of the grooves 314 is 0.05mm to 0.45mm, such as 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, and the like.

Specifically, the surface of the boss 311 departing from the cavity is lower than the surface of the guiding portion 312 departing from the cavity, so as to form the groove 314, that is, the bottom wall of the groove 314 is the boss 311, the side wall is the guiding portion 312, and in the direction from the guiding portion 312 to the second conductive member 32, the distance from the surface of the guiding portion 312 departing from the cavity to the boss 311 is the depth of the groove 314.

In other embodiments, a surface of the boss 311 facing away from the cavity is flush with a surface of the guiding portion 312 facing away from the cavity, that is, the first conductive member 31 is a flat cover, and the groove 314 is not provided.

The boss 311 and the connecting portion 312 may be integrally formed to form the first conductive member 31, but not limited thereto.

In some embodiments, as shown in fig. 1 to 3, 6 and 10, the first through hole includes a first hole section 310 and a second hole section 313, the cavity, the first hole section 310 and the second hole section 313 are sequentially communicated (i.e. the second hole section 313 is located on a side of the first hole section 310 facing away from the cavity), and a width of the first hole section 310 is smaller than a width of the second hole section 313 along a radial direction of the first through hole.

Illustratively, the cross-sections of the first bore section 310 and the second bore section 313 perpendicular to the axial direction thereof are both circular, the first bore section 310 and the second bore section 313 are coaxially arranged, and the diameter of the second bore section 313 is larger than that of the first bore section 310.

In some embodiments, the first bore section 310 has a diameter of 1mm to 2mm, such as 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, and the like.

The groove 314 is connected to the second hole section 313, the width of the groove 314 is greater than that of the second hole section 313 in the radial direction of the first through hole, illustratively, the cross section of the groove 314 perpendicular to the direction from the connecting portion 312 to the second conductive member 32 is circular, the groove 314 is coaxially disposed with the second hole section 313, and the diameter of the groove 314 is greater than that of the second hole section 313.

In addition, the cross-sectional shapes of the first hole section 310, the second hole section 313, and the groove 314 are not limited to circular, but may be regular or irregular polygons, such as square, respectively. In a direction along the conducting portion 312 to the second conductive member 32, a distance from a surface of the conducting portion 312 facing away from the cavity to the boss 311 is specifically a distance from a surface of the conducting portion 312 facing away from the cavity to a surface of the sidewall of the second hole section 313 facing away from the cavity (that is, a depth of the groove 314 is a distance from a surface of the conducting portion 312 facing away from the cavity to a surface of the sidewall of the second hole section 313 facing away from the cavity).

Specifically, the sealing element may include a first sealing portion connected to the boss and a second sealing portion disposed at the first through hole, the first sealing portion is connected to the second sealing portion, and may be disposed around an outer side of the second sealing portion, and the first sealing portion and the second sealing portion may be integrally formed to form the sealing element.

Wherein a surface of the first sealing portion facing the cavity is flush with a surface of the second sealing portion facing the cavity, or a surface of the second sealing portion facing the cavity extends into the second hole section 313 (i.e. the sealing element is formed with a second protrusion located in the second hole section 313 at the second sealing portion).

As shown in fig. 1, fig. 2, and fig. 10, the battery further includes a second adaptor located on a side of the second conductive member 32 departing from the cavity, the second adaptor is connected to the second conductive member 32, along a direction from the cavity to the top cover, a side of the second adaptor departing from the cavity is not larger than a side of the first conductive member 31 departing from the cavity, that is, a side of the second conductive member 32 departing from the cavity is used as a reference, and a side of the second adaptor 51 departing from the cavity is not higher than a side of the first conductive member 31/the conductive member 312 departing from the cavity, so that performance such as energy density of the battery can be further improved.

Specifically, the second adaptor includes a second adaptor sheet 51, and the second adaptor sheet 51 is located on a side of the second conductive member 32 away from the cavity and connected to the second conductive member 32, so that the second adaptor is connected to the second conductive member 32.

The projection of the second adapter sheet 51 on the plane of the surface of the second conductive member 32 is at least partially (partially or completely) located in the projection of the second conductive member 32 on the plane of the surface of the second conductive member 32, and generally, the second adapter sheet 51 does not substantially extend out of the outer edge of the second conductive member 32 (i.e., the projection of the second adapter sheet 51 on the plane of the surface of the second conductive member 32 is located in the projection of the second conductive member 32 on the plane of the surface of the second conductive member 32), which is beneficial to saving the space in the radial direction of the battery and further improving the energy density and other performances of the battery.

Specifically, the first conductive member 31 is provided with a second notch corresponding to the position of the second adaptor sheet 51, the second notch penetrates through the first conductive member 31/the connecting portion 312 in the thickness direction of the first conductive member 31 to expose the second conductive member 32, the second notch is located between the first conductive member 31/the connecting portion 312 and the outer periphery of the second conductive member 32 (also the outer periphery of the top cover) along the radial direction of the battery, and at least part of the second adaptor sheet 51 is located in the second notch and connected with the second conductive member 32 located below the second notch. For example, as shown in fig. 1 to 3 and 6, a projection of the second notch on the second conductive member 32 may be a semicircle, and a length of a connection line between two ends of the semicircle may be equal to a length of a side edge of the first conductive member 31/the guide connecting portion 312 facing the second interposer 51.

In addition, a gap exists between the second interposer 51 and the conductive portion 312, that is, the two are not in contact, so as to avoid short circuit.

As shown in fig. 1, 2 and 10, the second adaptor includes a second pin 53 connected to the second adaptor sheet 51, the second pin 53 may be specifically located on a side wall of the housing 1, and the second pin 53 may not only serve as a connector between the battery and a peripheral circuit (for example, connected to an electronic product), but also provide a positioning function for mounting the battery.

In some embodiments, the second adaptor further includes a second adaptor sheet 51, a second adaptor portion 52, and a second pin 53 connected in sequence, the second adaptor portion 52 extends along a side wall of the housing 1, and the second pin 53 extends in a direction away from the side wall of the housing 1.

Specifically, the second adaptor has a multi-bending structure, a cross section of the second pin 53 perpendicular to the thickness direction of the second pin 53 is parallel to a cross section of the second adaptor sheet 51 perpendicular to the thickness direction of the second adaptor sheet 51, and a cross section of the second adaptor portion 52 perpendicular to the thickness direction of the second adaptor portion 52 is perpendicular to a cross section of the second adaptor sheet 51 perpendicular to the thickness direction of the second adaptor sheet 51.

In addition, the second adaptor sheet 51 and the second adaptor portion 52 can be connected through a third arc transition portion 54, that is, the connection part of the two can be in arc transition; the second adapter portion 52 and the second pin 53 may be connected by a fourth arc transition portion 55, that is, the second adapter portion and the second pin may be transited by an arc.

In addition, the specific structure of the second adaptor may be similar to that of the first adaptor, for example, the structures shown in fig. 7, fig. 8, and fig. 9, which are not described again.

The second adaptor/second adaptor sheet 51 and the second conductive member 32 may be welded, specifically may be through-welded, and in a specific implementation, the second adaptor sheet 51 and the second conductive member 32 may be welded on a surface of the second adaptor sheet 51 away from the second conductive member 32, a solder print generated by the welding penetrates through the second adaptor sheet 51 and extends to the second conductive member 32, a length of a portion of the solder print extending to the second conductive member 32 in a direction from the second adaptor sheet 51 to the second conductive member 32 is smaller than a thickness of the second conductive member 32, that is, in a direction from the second adaptor sheet 51 to the second conductive member 32 (parallel to a direction from the top cover to the cavity), the thickness of the solder print is larger than the thickness of the second adaptor sheet 51 and smaller than a sum of the thickness of the second adaptor sheet 51 and the thickness of the second conductive member 32, so as to avoid the phenomena of insufficient soldering and solder penetration.

Generally, the height of the welding protrusion formed on the welding surface is less than or equal to 0.05mm, that is, the height of the protrusion generated by the welding on the surface of the second adapter sheet 51 away from the second conductive member 32 is less than or equal to 0.05mm (that is, the distance between the end of the protrusion away from the second adapter sheet 51 and the surface of the first adapter sheet 41 away from the second conductive member 32 is less than or equal to 0.05mm), and the welding tension of the second adapter sheet 51 and the second conductive member 32 is greater than 5N through a 180 ° tension test.

The welding may be laser welding, and the welding track may be a line, a circle, a spiral point, etc., and the welding process usually has no spatter, and generally may be performed by blowing an inert gas, such as nitrogen and/or argon, as a shielding gas.

Specifically, the second adaptor, the second conductive piece 32, the housing 1 and the second tab 22 are electrically connected in sequence, the first adaptor, the first conductive piece 31 and the first tab 21 are electrically connected in sequence, the second adaptor 51 and the first adaptor 41 are respectively used as wiring with a peripheral circuit, the second adaptor 51 and the first adaptor 41 are arranged on the same side of the battery, so that the welding between the second adaptor and the first adaptor is facilitated, the battery is prevented from being turned over at different angles in the manufacturing process, the process flow is simplified, and the manufacturing efficiency of the battery is improved.

As shown in fig. 1, 2 and 10, the first adaptor/first switching piece 41 and the second adaptor/second switching piece 51 are respectively located at two opposite sides of the first conductive member 31/conducting portion 312, specifically, the first conductive member has a first side and a second side opposite to each other, the first adaptor/first switching piece 41 is located at the first side of the first conductive member 31 (i.e., the side of the first conductive member 31 facing the first adaptor), and the second adaptor/second switching piece 51 is located at the second side of the first conductive member 31 (i.e., the side of the first conductive member 31 facing the second adaptor), and both sides facing away from the cavity are not higher than the side of the first conductive member 31 facing away from the cavity, so as to further improve the energy density of the battery.

The housing 1 may be made of stainless steel, the second conductive device 32 may be nickel or nickel-plated stainless steel, the first conductive device 31 (the boss 311/the conductive portion 312) may be made of aluminum or an aluminum alloy, the first insulating layer 33, the second insulating layer 34, the third insulating layer 11, the fourth insulating layer 35, the first insulating adhesive layer, and the second insulating adhesive layer may be respectively made of insulating adhesive, and the forming material thereof may include, for example, one or more of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), Polyamide (PA), Polyimide (PI), aramid (meta-aramid, PMIA; para-aramid, PPTA), and the like.

As mentioned above, the surface of the first conductive member 31 not departing from the cavity may be flush with the surface of the first conductive member 31 departing from the cavity, or lower than the surface of the first conductive member 31 departing from the cavity.

In an embodiment of the present invention, the manufacturing process of the battery may include:

sequentially stacking the first electrode plate, the diaphragm and the second electrode plate, and winding to form a winding core;

and (3) enabling the winding core qualified by X-ray analysis (X-ray) to enter an assembling procedure: sequentially carrying out gluing on the end face of the winding core (forming a first insulating glue layer/a second insulating glue layer), putting the winding core into a shell (namely, putting the winding core into a cavity of the shell), connecting a negative electrode lug with the shell (bending the negative electrode lug and welding the negative electrode lug with the bottom wall of the shell), connecting a positive electrode lug with a top cover (welding the positive electrode lug with a boss), bending and covering (after the positive electrode lug and the boss are welded, bending the positive electrode lug to cover the top cover on the shell), and carrying out circumferential welding of the shell and the top cover (namely, after covering, welding a second conductive piece with the outer periphery of the upper end of the shell); battery entering oven after the assembly toasts, accomplishes after moisture is qualified and annotates liquid, seals (annotate liquid hole seal welding), the helium is examined (the leakproofness is examined to the helium), processes such as charge-discharge, get into PACK welding (the first adaptor of welding and second adaptor) at last, accomplish the packing of battery, wherein, related top cap (cap subassembly) assembling process, annotate liquid hole seal welding process, adaptor (first adaptor/second adaptor) welding process specifically can be as follows:

(1) top cover (cover assembly) assembling process

Sequentially stacking the conducting parts of the second conducting piece, the first insulating glue and the first conducting piece;

setting parameters such as pressure, temperature, pressure maintaining time and the like of the hot pressing mechanism, and compounding the parts together by pressing down to complete the manufacture of the shell cover assembly; after hot-pressing and compounding, the first insulating glue forms a first insulating layer, and the deformation of the first insulating glue is generally 40% -80%.

(2) Sealing welding of liquid injection hole

Injecting electrolyte into the cavity of the shell through the injection hole (the first through hole), and cleaning the electrolyte by adopting dry/wet non-woven fabrics or laser to remove the electrolyte remained on the surface of the injection hole;

loading a sealing sheet above the liquid injection hole by a plastic suction mechanical arm, and identifying the central positions of the sealing sheet and the liquid injection hole by a Charge-coupled Device (CCD) for positioning; pressing the sealing sheet at the liquid injection hole by using a clamp, and fixing the position of the sealing sheet to prevent the sealing sheet from moving and shifting;

setting a welding track of a laser beam under the pressure action of inert gas, and welding the sealing sheet and the boss from the side of the sealing sheet departing from the boss to seal the liquid injection hole; the welding track can be a line, a circle, a circular ring, a spiral point and the like, and no splashing exists in the welding process;

(3) adapter welding

The first rotating sheet and the guide connecting part are in lap welding, namely one welded surface of the first rotating sheet and the guide connecting part is parallel to the direction from the top cover to the cavity, and a laser beam F in the welding process is shown in figure 11;

the second adapter sheet and the second conductive piece are welded in a penetrating mode, welding tracks can be lines, circles, spiral points and the like, splashing does not exist in the welding process, and protective gas such as nitrogen, argon and the like can be blown; the welding bulge is less than or equal to 0.05mm, the welding tension is greater than 5N, and the insufficient welding is ensured not to be generated.

And (3) performing air tightness detection on the welded electric core, wherein the leak rate of the helium detection tightness test is less than 1.0E-6mbar.L/s, and ensuring that no over-welding or welding penetration is generated.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A battery, comprising:

a housing;

the top cover is covered on the shell and forms a cavity together with the shell; the top cover comprises a second conductive piece connected with the shell and a first conductive piece positioned on one side of the second conductive piece, which is far away from the cavity;

the battery cell is positioned in the cavity; the battery cell is provided with a first tab electrically connected with the first conductive piece;

and the first adapter piece is positioned on one side of the second conductive piece, which deviates from the cavity, and is connected with the first conductive piece, and one surface of the first adapter piece, which deviates from the cavity, does not exceed one surface of the first conductive piece, which deviates from the cavity, in the direction from the cavity to the top cover.

2. The battery of claim 1, wherein a first insulating layer is disposed between the first conductive member and the second conductive member.

3. The battery of claim 2, wherein a projection of the first insulating layer onto the second conductive member covers a projection of the first conductive member onto the second conductive member.

4. The battery of claim 1, wherein a side of the second conductive member facing the cavity is provided with a fourth insulating layer.

5. The battery according to claim 1,

one surface of the first transfer piece connected with the first conductive piece is parallel to the direction from the top cover to the cavity;

and/or the first switching piece comprises a first switching piece connected with the first conductive piece, and the projection of the first switching piece on the plane of the surface of the second conductive piece is at least partially positioned in the projection of the second conductive piece on the plane of the surface of the second conductive piece;

and/or the first adapter is welded with the first conductive piece;

and/or a second insulating layer is arranged between the first adapter and the second conductive piece.

6. The battery of claim 1 or 5, wherein the first conductive member is provided with a first protrusion connected to the first transition member, and the first protrusion is provided on a side of the first conductive member facing away from the cavity, or on a side of the first conductive member facing the first transition member.

7. The battery of claim 1 or 3, wherein the first transition member comprises a first transition piece, a first transition part and a first pin which are connected in sequence, the first transition piece is connected with the first conductive member, the first transition part extends along the side wall of the shell, and the first pin extends in a direction away from the side wall of the shell.

8. The battery of claim 7, wherein a third insulating layer is disposed between the first transition portion and the case.

9. The battery according to claim 1 or 2,

the battery cell is also provided with a second tab with the polarity opposite to that of the first tab, and the second tab is electrically connected with the second conductive piece;

the battery also comprises a second adapter piece which is positioned on one side of the second conductive piece, which deviates from the cavity, and is connected with the second conductive piece, and one surface of the second adapter piece, which deviates from the cavity, is not more than one surface of the first conductive piece, which deviates from the cavity, along the direction from the cavity to the top cover.

10. The battery according to claim 9,

the second adapter and the first adapter are respectively positioned at two opposite sides of the first conductive piece;

and/or the second adapter piece is welded with the second conductive piece;

and/or the second adapter piece comprises a second adapter piece, a second adapter part and a second pin which are sequentially connected, the second adapter piece is connected with the second conductive piece, the second adapter part extends along the side wall of the shell, and the second pin extends along the direction far away from the side wall of the shell.

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