CN219575768U - Secondary lithium battery and electronic product - Google Patents
Secondary lithium battery and electronic product Download PDFInfo
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- CN219575768U CN219575768U CN202222970389.5U CN202222970389U CN219575768U CN 219575768 U CN219575768 U CN 219575768U CN 202222970389 U CN202222970389 U CN 202222970389U CN 219575768 U CN219575768 U CN 219575768U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a secondary lithium battery and an electronic product, wherein the secondary lithium battery comprises a bottom shell, a sealing compound body and a battery core, wherein the bottom shell and the sealing compound body form an internal accommodating cavity; the sealing compound body comprises a sealing welding layer, an insulating sealing layer and a waterproof conductive layer; an annular side wall extending in a direction facing the sealing compound body; the end part of the annular side wall, which is close to the sealing compound body, is provided with a transverse platform extending to the outer side of the internal accommodating cavity, and the width of the platform of the transverse platform is more than or equal to 2.1 times of the thickness of the annular side wall; one end of the transverse platform, which is far away from the internal accommodating cavity, is provided with a longitudinal welding table parallel to the annular side wall, and the height of the longitudinal welding table is greater than or equal to 0.2 times of the thickness of the sealing welding layer and less than or equal to 1.2 times of the thickness of the sealing welding layer; the seal welding layer and the longitudinal welding table are fused together to form a seal. The technical scheme of the utility model is beneficial to improving the safety performance of the secondary lithium battery.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a secondary lithium battery and an electronic product.
Background
In the existing button battery, a battery shell is formed by splicing a positive electrode shell and a negative electrode shell, and insulation is needed between the positive electrode shell and the negative electrode shell so as to avoid short circuit of the button battery. The related art realizes insulation by providing an insulation sleeve between the positive electrode case and the negative electrode case, and welds and fixes the positive electrode case and the negative electrode case. Therefore, the connection strength of the two is far greater than that of the battery anode casing or the battery cathode casing. When the battery is short-circuited or the battery is in fault, a large amount of gas is generated in the battery, and the gas does not have a proper drainage way, so that the battery bursts when the gas pressure reaches a certain value, thereby causing accidents.
Disclosure of Invention
The utility model mainly aims to provide a secondary lithium battery and an electronic product, and aims to solve the problem of how to improve the safety of the battery.
In order to achieve the above object, the present utility model provides a secondary lithium battery comprising:
the battery pack comprises a bottom shell, a sealing compound body and a battery cell, wherein the bottom shell and the sealing compound body form an internal accommodating cavity, and the battery cell is arranged in the internal accommodating cavity;
the sealing compound body comprises a sealing welding layer, an insulating sealing layer and a waterproof conductive layer;
one electrode of the battery core is electrically connected with the waterproof conductive layer, and the other electrode is electrically connected with the sealing welding layer or the bottom shell;
the area of the insulating sealing layer projected to the sealing welding layer is 0.2-0.9 times of the area of the first side surface of the sealing welding layer; the first side surface is arranged facing the insulating sealing layer;
the area of the insulating sealing layer projected to the waterproof conductive layer is 0.25-0.95 times of the surface area of the second side of the waterproof conductive layer; the second side face is arranged to face the insulating sealing layer;
the bottom shell comprises a round or oval bottom and an annular side wall extending towards the sealing compound body;
the end part of the annular side wall, which is close to the sealing compound body, is provided with a transverse platform extending to the outer side of the internal accommodating cavity, and the width of the platform of the transverse platform is more than or equal to 2.1 times of the thickness of the annular side wall;
one end of the transverse platform, which is far away from the internal accommodating cavity, is provided with a longitudinal welding table parallel to the annular side wall, and the height of the longitudinal welding table is greater than or equal to 0.2 times of the thickness of the sealing welding layer and less than or equal to 1.2 times of the thickness of the sealing welding layer;
the seal welding layer and the longitudinal welding table are fused together to form a seal.
Optionally, the inner side wall of the transverse platform and the inner side wall of the annular side wall are in transitional connection through a first inner arc angle, and the angle of the first inner arc angle is more than or equal to 270 degrees and less than or equal to 315 degrees; the outer side wall of the transverse platform is in transitional connection with the outer side wall of the annular side wall through a first outer arc angle, and the angle of the first outer arc angle is more than or equal to 90 degrees and less than or equal to 135 degrees.
Optionally, the inner side wall of the longitudinal welding table is in transitional connection with the inner side wall of the transverse platform through a second inner arc angle, and the angle of the second inner arc angle is more than or equal to 90 degrees and less than or equal to 105 degrees; the outer side wall of the longitudinal welding table is in transitional connection with the outer side wall of the transverse platform through a second outer arc angle, and the angle of the second outer arc angle is more than or equal to 270 degrees and less than or equal to 315 degrees.
Optionally, the difference between the annular inner diameter formed by the longitudinal welding table and the outer diameter of the sealing welding layer is more than 0 and less than or equal to 0.4 times of the sum of the thicknesses of the longitudinal welding table and the sealing welding layer.
Optionally, the thickness of the sealing welding layer is 0.1mm-0.2mm.
Optionally, the thickness of the bottom housing is 0.1mm-0.15mm.
Optionally, the bottom shell and the sealing welding layer are made of the same metal material.
Optionally, the bottom shell and the seal welding layer are made of 304 stainless steel or 316 stainless steel.
Optionally, an electrode connected with the waterproof conductive layer by the battery cell is an anode.
The utility model further provides an electronic product, which comprises an equipment body and a secondary lithium battery, wherein the battery is electrically connected with the equipment body so as to provide electric energy for the equipment body;
the secondary lithium battery comprises a bottom shell, a sealing compound body and a battery cell, wherein the bottom shell and the sealing compound body form an internal accommodating cavity, and the battery cell is arranged in the internal accommodating cavity;
the sealing compound body comprises a sealing welding layer, an insulating sealing layer and a waterproof conductive layer;
one electrode of the battery core is electrically connected with the waterproof conductive layer, and the other electrode is electrically connected with the sealing welding layer or the bottom shell;
the area of the insulating sealing layer projected to the sealing welding layer is 0.2-0.9 times of the area of the first side surface of the sealing welding layer; the first side surface is arranged facing the insulating sealing layer;
the area of the insulating sealing layer projected to the waterproof conductive layer is 0.25-0.95 times of the surface area of the second side of the waterproof conductive layer; the second side face is arranged to face the insulating sealing layer;
the bottom shell comprises a round or oval bottom and an annular side wall extending towards the sealing compound body;
the end part of the annular side wall, which is close to the sealing compound body, is provided with a transverse platform extending to the outer side of the internal accommodating cavity, and the width of the platform of the transverse platform is more than or equal to 2.1 times of the thickness of the annular side wall;
one end of the transverse platform, which is far away from the internal accommodating cavity, is provided with a longitudinal welding table parallel to the annular side wall, and the height of the longitudinal welding table is greater than or equal to 0.2 times of the thickness of the sealing welding layer and less than or equal to 1.2 times of the thickness of the sealing welding layer;
the seal welding layer and the longitudinal welding table are fused together to form a seal.
According to the utility model, the welding laser is shielded by the sealing welding layer and the transverse platform through the arrangement of the transverse platform, so that the laser is prevented from missing into the battery to damage the battery core, the battery core is effectively protected, and the safety and the product yield of the battery are improved; meanwhile, the transverse platform can bear and solidify dust formed in the welding process, so that the dust is prevented from falling into the battery, the phenomena of short circuit and the like of the battery caused by the dust are avoided, and the safety and the product yield of the battery are improved;
the connecting area of the insulating sealing layer and the sealing welding layer is 0.2-0.9 times of the side area of the sealing welding layer; setting the connection area of the insulating sealing layer and the waterproof conductive layer to be 0.25-0.95 times of the surface area of the waterproof conductive layer; the height of the longitudinal welding table is set to be 0.2-1.2 times of the thickness of the sealing welding layer, so that the connection area of the insulating sealing layer and the sealing welding layer and the connection area of the insulating sealing layer and the waterproof conductive layer are large enough, and the connection strength is enough to support the connection strength required in the subsequent process (such as the process of injecting electrolyte into the battery, wherein the pressure difference between the inside and the outside of the battery is needed, and the electrolyte enters the accommodating cavity under the action of the pressure difference) and the working process; meanwhile, when a large amount of gas is formed in the battery, the gas in the battery can wash away the joint of the insulating sealing layer and the sealing welding layer to obtain release of the gas, so that explosion of the battery is avoided;
and, such that the seal sealing layer and the longitudinal land (and in some embodiments, the portion of the transverse land adjacent the longitudinal land) have a weld strength that is greater than the bond strength of the insulating sealing layer and the seal welding layer, greater than the bond strength of the insulating sealing layer and the waterproof conductive layer, and less than the load bearing strength of the bottom housing itself. Thus, when a large amount of gas is generated in the battery due to faults in a short time, the insulating sealing layer can be flushed firstly, and then the welding position of the sealing welding layer and the longitudinal welding (in some embodiments, the welding position also comprises a part of transverse platform adjacent to the longitudinal welding platform) can be torn slowly, so that gas is released slowly; therefore, two air leakage security guarantees are formed, whether the air pressure in the battery is slowly increased or is rapidly increased in a short time, the explosion of the battery can be avoided in an air release and pressure release mode, and the safety of the battery is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment of a secondary lithium battery according to the present utility model;
FIG. 2 is a schematic diagram of the explosive structure of FIG. 1;
FIG. 3 is a schematic view of the structure of FIG. 1 from another perspective;
FIG. 4 is a schematic cross-sectional view of the structure at A-A in FIG. 3;
FIG. 5 is an enlarged schematic view of the structure at M in FIG. 4;
FIG. 6 is an enlarged schematic view of the sealing weld layer at N of FIG. 4;
FIG. 7 is a schematic view of an exploded structure of the closure assembly of FIG. 1;
FIG. 8 is a schematic view of the bottom housing of FIG. 1;
FIG. 9 is a schematic cross-sectional view of the structure at B-B in FIG. 8;
FIG. 10 is an enlarged schematic view of an embodiment of O in FIG. 9;
fig. 11 is an enlarged schematic view of another embodiment of the O in fig. 9.
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Sealing composite | 200 | Bottom shell |
| 210 | Internal accommodating cavity | 300 | Battery cell |
| 110 | Sealing welding layer | 111 | Avoidance hole |
| 120 | Insulating sealing layer | 130 | Waterproof conductive layer |
| 220 | Annular side wall | 230 | Transverse platform |
| 240 | Vertical welding table |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The utility model provides a secondary lithium battery, which takes a small-sized button battery, a mobile phone battery, a circular ring battery and the like as examples. The structure and principle of the battery will be described in detail.
Referring to fig. 1 to 11, a secondary lithium battery includes a bottom case 200, a sealing compound 100, and a battery cell 300, wherein the bottom case 200 and the sealing compound 100 form an internal receiving cavity 210, and the battery cell 300 is disposed in the internal receiving cavity 210;
the sealing compound 100 includes a sealing welding layer 110, an insulating sealing layer 120, and a waterproof conductive layer 130;
one electrode of the battery 300 is electrically connected with the waterproof conductive layer 130, and the other electrode is electrically connected with the sealing welding layer 110 or the bottom shell 200;
the area of the insulating sealing layer 120 projected onto the sealing welding layer 110 is 0.2-0.9 times the area of the first side surface of the sealing welding layer 110; the first side is disposed facing the insulating sealing layer 120;
the area of the insulating sealing layer 120 projected onto the waterproof conductive layer 130 is 0.25-0.95 times the area of the second side surface of the waterproof conductive layer 130; the second side is disposed facing the insulating sealing layer 120;
the bottom case 200 includes a circular or oval bottom, and an annular sidewall 220 extending in a direction facing the sealing compound 100;
the end of the annular side wall 220, which is close to the sealing compound body 100, is provided with a transverse platform 230 extending to the outer side of the inner accommodating cavity 210, and the platform width of the transverse platform 230 is more than or equal to 2.1 times of the thickness of the annular side wall 220 and less than or equal to 4.2 times of the thickness of the annular side wall 220;
the end of the transverse platform 230 away from the inner accommodating cavity 210 is provided with a longitudinal welding table parallel to the annular side wall 220, and the height of the longitudinal welding table is greater than or equal to 0.2 times the thickness of the sealing welding layer 110 and less than or equal to 1.2 times the thickness of the sealing welding layer 110;
the seal weld 110 merges with the longitudinal land to form a seal.
Specifically, in this embodiment, the bottom case 200 and the sealing compound 100 may have a plurality of shapes, and the two may enclose a housing cavity. The sealing compound 100 is hermetically connected to the bottom case 200 by welding. The whole shell of the secondary lithium battery can be in a plurality of shapes, such as a round cake shape, an oval cake shape, a cuboid shape and the like, and the battery is exemplified as the round cake shape. Preferably, in order to reduce the thickness of the battery case and to improve the service life of the battery, the bottom case 200 and the sealing compound 100 are made of metal materials, and in some embodiments, the bottom case 200 and the sealing welding layer 110 are made of the same metal materials in order to improve the welding effect. The metal material may be stainless steel, and the specific stainless steel may be 304 stainless steel or 316 stainless steel. Specifically, the sealing welding layer 110 and the waterproof conductive layer 130 of the sealing compound 100 are both supported by metal materials. The insulating sealing layer 120 is an insulating glue layer, which not only insulates the sealing welding layer 110 from the waterproof conductive layer 130, but also can tightly connect the sealing welding layer and the waterproof conductive layer together.
The cell 300 has a positive electrode and a negative electrode, wherein the positive electrode is electrically connected with the waterproof conductive layer 130; the negative electrode is electrically connected with the sealing welding layer 110 or the negative electrode is electrically connected with the bottom case 200. Of course, in some embodiments, the negative electrode may also be electrically connected to the waterproof conductive layer 130; the positive electrode is electrically connected to the sealing welding layer 110 or the positive electrode is electrically connected to the bottom case 200. There are many ways of electrical connection, in this embodiment, the electrode is extended to the position to be connected by soldering.
The seal weld layer 110 may have a variety of shapes, for example, a circular ring shape, and has a relief hole 111 in the middle. The waterproof conductive layer 130 may have a variety of shapes, for example, a circular shape. The sealing weld layer 110, the insulating seal layer 120, and the waterproof conductive layer 130 are stacked in this order. The insulating seal layer 120 may have a variety of shapes, for example, a circular ring shape, which fills the lamination area of the seal bonding layer 110 and the waterproof conductive layer 130, completely isolating the seal bonding layer 110 and the waterproof conductive layer 130. The lamination area of the insulating sealing layer 120 and the sealing welding layer 110 is set to be at least 0.2 times that of the sealing welding layer 110, so that the connection area of the insulating sealing layer 120 and the sealing welding layer 110 is large enough, and the connection strength of the insulating sealing layer 120 and the sealing welding layer 110 is sufficient to support the connection strength required in the subsequent process (such as the process of injecting electrolyte into the battery, wherein the electrolyte needs to be introduced into the accommodating cavity under the action of pressure difference through the pressure difference between the inside and the outside of the battery) and the working process. Meanwhile, the lamination area of the insulating sealing layer 120 and the sealing welding layer 110 is set to be not more than 0.9 times of the area of the sealing welding layer 110, so that when the battery is short-circuited or the battery is internally failed, and a large amount of gas is formed in the battery, the gas in the battery can wash the joint of the insulating sealing layer 120 and the sealing welding layer 110, so that the gas is released, the explosion of the battery is avoided, and the safety of the battery is improved.
Similarly, by setting the connection area between the insulating sealing layer 120 and the waterproof conductive layer 130 to be at least 0.25 times the surface area of the waterproof conductive layer 130, the connection area between the insulating sealing layer 120 and the waterproof conductive layer 130 can be made large enough, so that the connection strength between the insulating sealing layer 120 and the waterproof conductive layer 130 is sufficient to support the connection strength required in the subsequent process (for example, in the process of injecting the electrolyte into the battery, a pressure difference needs to exist between the inside of the battery and the outside of the battery, and the electrolyte enters the accommodating cavity under the action of the pressure difference) and the operation process. Meanwhile, the lamination area of the insulating sealing layer 120 and the waterproof conductive layer 130 is set to be not more than 0.95 times of the area of the waterproof conductive layer 130, so that when the battery is short-circuited or the battery is internally failed, and a large amount of gas is formed in the battery, the gas in the battery can wash away the connection part of the insulating sealing layer 120 and the waterproof conductive layer 130, so that the gas is released, the explosion of the battery is avoided, and the safety of the battery is improved.
The bottom housing 200 includes a circular or oval bottom and an annular sidewall 220 extending in a direction facing the closure composite 100. The end of the annular sidewall 220 adjacent to the closure composite 100 has a lateral land 230 extending outward of the interior receiving cavity 210, the land width L of the lateral land 230 being 2.1 times or more the thickness D of the annular sidewall 220. In some embodiments, the land width L of the lateral land 230 is less than or equal to 4.2 times the thickness D of the annular sidewall 220. The seal welding layer 110 is overlapped on the transverse platform 230, and the laser welds the longitudinal welding table and the edge of the seal welding layer 110 in the process of welding the seal welding layer 110 and the longitudinal welding table by the laser. At this time, the laser is shielded by the sealing welding layer 110 and the transverse platform 230, so that the damage to the battery core 300 caused by the missing of the laser in the battery is avoided, the battery core 300 is effectively protected, and the safety and the product yield of the battery are improved. Meanwhile, in the actual melting process, the part of the transverse platform 230 close to the longitudinal welding table (the melting position occurs at the side of the transverse platform 230 facing the sealing welding layer 110) will also melt with the sealing welding layer 110, so that the transverse platform 230 can bear and solidify the dust formed in the welding process, and the dust is prevented from falling into the battery, thereby avoiding the phenomena of short circuit and the like of the battery caused by the dust, and being beneficial to improving the safety and the product yield of the battery.
Meanwhile, by making the height H of the longitudinal land greater than or equal to 0.2 times the thickness d of the sealing weld layer 110 and less than or equal to 1.2 times the thickness d of the sealing weld layer 110. Such that the weld strength of the sealing seal layer to the longitudinal land (and, in some embodiments, also to the portion of the transverse land 230 adjacent to the longitudinal land) is greater than the bond strength of the insulating seal layer 120 to the sealing weld layer 110, greater than the bond strength of the insulating seal layer 120 to the water resistant conductive layer 130, and less than the load bearing strength of the bottom housing 200 itself. In this manner, when a large amount of gas is generated within the battery due to a failure within a short period of time, the insulating sealing layer 120 may be first flushed, and then the welded position of the sealing weld layer 110 to the longitudinal weld (and, in some embodiments, the portion of the lateral platform 230 adjacent to the longitudinal weld station) may be slowly torn. The explosion of the battery is avoided, and the safety of the battery is improved.
In this embodiment, by the arrangement of the transverse platform 230, the welded laser is shielded by the sealing welding layer 110 and the transverse platform 230, so as to avoid the laser missing into the battery and damaging the battery cell 300, thereby effectively protecting the battery cell 300 and improving the safety and the product yield of the battery; meanwhile, the transverse platform 230 can bear and solidify the dust formed in the welding process, so that the dust is prevented from falling into the battery, the phenomena of short circuit and the like of the battery caused by the dust are avoided, and the safety and the product yield of the battery are improved;
further, the connection area between the insulating seal layer 120 and the sealing weld layer 110 is set to be 0.2 to 0.9 times the side area of the sealing weld layer 110; setting the connection area of the insulating sealing layer 120 and the waterproof conductive layer 130 to be 0.25-0.95 times the surface area of the waterproof conductive layer 130; the height of the longitudinal welding table is set to be 0.2-1.2 times of the thickness of the sealing welding layer 110, so that the connection area of the insulating sealing layer 120 and the sealing welding layer 110 and the connection area of the insulating sealing layer 120 and the waterproof conductive layer 130 are large enough, and the connection strength is enough to support the subsequent process (such as the process of injecting electrolyte into the battery, the pressure difference between the inside and the outside of the battery is needed, and the electrolyte enters the accommodating cavity under the action of the pressure difference) and the connection strength required in the working process; meanwhile, when a large amount of gas is formed in the battery, the gas in the battery can wash away the joint of the insulating sealing layer 120 and the sealing welding layer 110 to obtain release of the gas, so that explosion of the battery is avoided;
and, such that the weld strength of the sealing seal layer to the longitudinal land (and, in some embodiments, the portion of the transverse land 230 adjacent to the longitudinal land) is greater than the bond strength of the insulating seal layer 120 to the sealing weld layer 110, greater than the bond strength of the insulating seal layer 120 to the waterproof conductive layer 130, and less than the load bearing strength of the bottom housing 200 itself. Thus, when a large amount of gas is generated in the battery due to a failure in a short time, the insulating sealing layer 120 can be flushed first, and then the welding position of the sealing welding layer 110 and the longitudinal welding (in some embodiments, the part of the transverse platform 230 adjacent to the longitudinal welding table) can be slowly torn, so that gas is slowly leaked; therefore, two air leakage security guarantees are formed, whether the air pressure in the battery is slowly increased or is rapidly increased in a short time, the explosion of the battery can be avoided in an air release and pressure release mode, and the safety of the battery is greatly improved.
In some embodiments, in order to improve the supporting effect, dust-blocking effect and welding effect of the lateral platform 230, the inner sidewall of the lateral platform 230 and the inner sidewall of the annular sidewall 220 are in transitional connection through a first inner arc angle, and the angle of the first inner arc angle α is greater than or equal to 270 degrees and less than or equal to 315 degrees; the outer side wall of the transverse platform 230 is in transitional connection with the outer side wall of the annular side wall 220 through a first outer arc angle beta, and the angle of the first outer arc angle beta is greater than or equal to 90 degrees and less than or equal to 135 degrees. Specifically, in this embodiment, by setting the angle of the first inner arc angle α to be greater than or equal to 270 degrees and less than or equal to 315 degrees, the angle of the first outer arc angle β is greater than or equal to 90 degrees and less than or equal to 135 degrees, so that the stress at the connection between the transverse platform 230 and the annular sidewall 220 is uniformly distributed, the size of the transverse platform 230 actually participating in melting in the melting process is reduced, and the welding area between the edge of the sealing welding layer 110 and the transverse platform 230 is favorably controlled.
In some embodiments, to improve the welding effect between the longitudinal welding table and the sealing welding layer 110, the inner side wall of the longitudinal welding table and the inner side wall of the transverse platform 230 are in transitional connection through a second inner arc angle γ, where the angle of the second inner arc angle γ is greater than or equal to 90 degrees and less than or equal to 105 degrees; the outer side wall of the longitudinal welding table is in transitional connection with the outer side wall of the transverse platform 230 through a second outer arc angle delta, and the angle of the second outer arc angle delta is more than or equal to 270 degrees and less than or equal to 315 degrees.
Specifically, in this embodiment, by setting the angle of the second inner arc angle γ to be greater than or equal to 90 degrees and less than or equal to 105 degrees, and setting the angle of the second outer arc angle δ to be greater than or equal to 270 degrees and less than or equal to 315 degrees, the stress at the connection position between the transverse platform 230 and the vertical welding table 240 is uniformly distributed, the fusion space between the vertical welding table 240 and the edge of the sealing welding layer 110 is increased, and the welding thickness between the edge of the sealing welding layer 110 and the longitudinal welding table is favorably controlled.
It should be noted that the longitudinal welding stage, the transverse platform 230 and the annular sidewall 220 are integrally formed, and the three parts are formed by a stamping process.
In some embodiments, to improve the explosion-proof effect of the secondary lithium battery, the difference between the inner diameter of the ring shape formed by the longitudinal welding table and the outer diameter of the sealing welding layer 110 is greater than or equal to the thickness of the sealing welding layer 110 and less than or equal to 0.4 times the sum of the thicknesses of the longitudinal welding table and the sealing welding layer 110.
That is, in the present embodiment, the inner diameter formed by the longitudinal land is larger than the outer diameter of the sealing land 110, that is, a welding gap is provided between the edge of the sealing land 110 and the inner side wall of the longitudinal land, which is larger than 0 and equal to or smaller than 0.2 times the sum of the thicknesses of the longitudinal land and the sealing land 110 (the difference in radial dimension is 2 times the one-sided gap). Thus, the distance between the longitudinal welding table and the edge of the sealing welding layer 110 can be ensured to be small enough, the welding quality can be ensured, the phenomenon of cold welding is avoided, and the improvement of the product yield is facilitated. The thickness of the longitudinal stage is exemplified by 0.1mm to 0.15mm, and the thickness of the sealing layer 110 is exemplified by 0.1mm to 0.2mm.
When the thickness of the sealing plate layer is 0.2mm and the thickness of the longitudinal welding table is 0.15mm, the difference of the diameters is 0.4 (0.2+0.15) mm=0.14 mm, and the size of the gap is 0.14 mm/2=0.07 mm.
When the thickness of the sealing plate layer is 0.1mm and the thickness of the longitudinal welding table is 0.1mm, the difference of the diameters is 0.4 (0.1+0.1) mm=0.08 mm, and the size of the gap is 0.08 mm/2=0.04 mm.
In some embodiments, to enhance the explosion-proof effect of the battery, the seal weld layer 110 has a thickness of 0.1mm-0.2mm, for example 0.12mm, 0.15mm, 0.16mm, 0.18 mm. The thickness of the bottom housing 200 is 0.1mm-0.15mm, for example 0.11mm, 0.12mm, 0.13mm, 0.14 mm. In this embodiment, the thickness of the bottom case 200 is set to 0.1mm to 0.15mm by setting the thickness of the sealing welding layer 110 to 0.1mm to 0.2mm, so that the structural strength of the welded portion is smaller than that of the bottom case 200.
The utility model also provides an electronic product, which comprises an equipment body and a secondary lithium battery, wherein the battery is electrically connected with the equipment body so as to provide electric energy for the equipment body. The specific structure of the battery refers to the above embodiments, and since the battery adopts all the technical solutions of all the embodiments, the battery has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The battery can be arranged as a button battery which is mainly applied to the electronic product to provide electric energy for the electronic product. The electronic product can be an earphone, a watch and the like, and has smaller voltage.
The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. A secondary lithium battery is characterized in that,
the secondary lithium battery comprises a bottom shell, a sealing compound body and a battery cell, wherein the bottom shell and the sealing compound body form an internal accommodating cavity, and the battery cell is arranged in the internal accommodating cavity;
the sealing compound body comprises a sealing welding layer, an insulating sealing layer and a waterproof conductive layer;
one electrode of the battery core is electrically connected with the waterproof conductive layer, and the other electrode is electrically connected with the sealing welding layer or the bottom shell;
the area of the insulating sealing layer projected to the sealing welding layer is 0.2-0.9 times of the area of the first side surface of the sealing welding layer; the first side surface is arranged facing the insulating sealing layer;
the area of the insulating sealing layer projected to the waterproof conductive layer is 0.25-0.95 times of the surface area of the second side of the waterproof conductive layer; the second side face is arranged to face the insulating sealing layer;
the bottom shell comprises a round or oval bottom and an annular side wall extending towards the sealing compound body;
the end part of the annular side wall, which is close to the sealing compound body, is provided with a transverse platform extending to the outer side of the internal accommodating cavity, and the width of the platform of the transverse platform is more than or equal to 2.1 times of the thickness of the annular side wall;
one end of the transverse platform, which is far away from the internal accommodating cavity, is provided with a longitudinal welding table parallel to the annular side wall, and the height of the longitudinal welding table is greater than or equal to 0.2 times of the thickness of the sealing welding layer and less than or equal to 1.2 times of the thickness of the sealing welding layer;
the seal welding layer and the longitudinal welding table are fused together to form a seal.
2. The secondary lithium battery of claim 1, wherein the inner side wall of the transverse platform and the inner side wall of the annular side wall are in transitional connection through a first inner circular arc angle, and the angle of the first inner circular arc angle is more than or equal to 270 degrees and less than or equal to 315 degrees; the outer side wall of the transverse platform is in transitional connection with the outer side wall of the annular side wall through a first outer arc angle, and the angle of the first outer arc angle is more than or equal to 90 degrees and less than or equal to 135 degrees.
3. The secondary lithium battery of claim 1, wherein the inner side wall of the longitudinal welding table and the inner side wall of the transverse platform are in transitional connection through a second inner circular arc angle, and the angle of the second inner circular arc angle is more than or equal to 90 degrees and less than or equal to 105 degrees; the outer side wall of the longitudinal welding table is in transitional connection with the outer side wall of the transverse platform through a second outer arc angle, and the angle of the second outer arc angle is more than or equal to 270 degrees and less than or equal to 315 degrees.
4. The secondary lithium battery of claim 1, wherein a difference between an inside diameter of the ring shape formed by the longitudinal land and an outside diameter of the sealing weld layer is greater than 0 and less than or equal to 0.4 times a sum of thicknesses of the longitudinal land and the sealing weld layer.
5. The secondary lithium battery of claim 1, wherein the seal weld layer has a thickness of 0.1mm to 0.2mm.
6. The secondary lithium battery of claim 1 wherein the bottom casing has a thickness of 0.1mm to 0.15mm.
7. The secondary lithium battery of any one of claims 1-6 wherein the bottom casing and the seal weld layer are the same metal material.
8. The secondary lithium battery of claim 7 wherein the bottom housing and the seal weld layer are made of 304 stainless steel or 316 stainless steel.
9. The battery of claim 1, wherein the electrode of the cell connected to the waterproof conductive layer is a positive electrode.
10. An electronic product comprising an apparatus body and the secondary lithium battery as claimed in any one of claims 1 to 9, said battery being electrically connected to said apparatus body for providing electrical energy to the apparatus body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222970389.5U CN219575768U (en) | 2022-11-08 | 2022-11-08 | Secondary lithium battery and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222970389.5U CN219575768U (en) | 2022-11-08 | 2022-11-08 | Secondary lithium battery and electronic product |
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| Publication Number | Publication Date |
|---|---|
| CN219575768U true CN219575768U (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222970389.5U Active CN219575768U (en) | 2022-11-08 | 2022-11-08 | Secondary lithium battery and electronic product |
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| Country | Link |
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| CN (1) | CN219575768U (en) |
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