WO2017113413A1

WO2017113413A1 - Battery and battery casing thereof

Info

Publication number: WO2017113413A1
Application number: PCT/CN2015/100343
Authority: WO
Inventors: 文洁; 何自坚
Original assignee: 深圳市大富精工有限公司
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2017-07-06
Also published as: CN107615512A; CN107615512B

Abstract

A battery and a battery casing (200) thereof, the battery comprising a battery core (100) and a battery casing (200), the battery casing (200) further comprising an upper casing (210) and a lower casing (220), the material of both the upper casing (210) and the lower casing (220) being metal, the battery casing (200) being formed between the upper casing (210) and the lower casing (220) by means of laser full circumference corrugated seal welding, and the battery core (100) being placed in the battery casing (200). The present battery casing (200) is made of metal material, and a sealed cavity is formed by means of laser full circumference corrugated seal welding, the battery core (100) being placed inside the battery casing (200) cavity. As the battery casing (200) employs metal material and is made using a laser welding procedure, the battery structure is very safe, and has good heat dissipation and strong sealing.

Description

Battery and battery case thereof

[Technical Field]

The present invention relates to the technical field of battery package structures, and in particular to a battery and a battery case thereof.

【Background technique】

As a common energy supply unit, the safety of batteries has always been a concern. A conventional battery package structure is shown in FIG. 1. FIG. 1 is a partial cross-sectional view showing a conventional battery package structure in the prior art. The package structure of the battery is: loading the battery core 4 into the metal tube 2, and riveting the metal The tube 2 produces a rivet compression port 5 which is crimped into the metal tube 2 to form a sealed battery. This battery package has the following drawbacks:

1. The sealing performance of the rivet compression port 5 is poor, and the electrolyte in the battery will leak therefrom once it is thermally expanded.

2. The heat dissipation performance of the battery is poor, which is not conducive to combining into a high-power battery.

3. The safety performance of the battery is poor, especially in special cases such as impact and internal short circuit, it is particularly easy to explode from the rivet compression port 5.

[Summary of the Invention]

Embodiments of the present invention provide a battery and a battery case thereof to solve the technical problems of poor safety, tightness, and heat dissipation of the battery in the prior art.

In order to solve the above problems, an embodiment of the present invention provides a battery including a battery core and a battery case, the battery case further including an upper case and a lower case, and the upper case and the lower case are made of materials The metal case is formed by laser full-circle corrugated sealing between the upper case and the lower case, and the battery cell is disposed in the battery case.

According to a preferred embodiment of the present invention, the upper case and the lower case are made of stainless steel.

According to a preferred embodiment of the present invention, the battery includes a plurality of sets of battery cells, and the plurality of sets of battery cells are disposed in the battery case.

According to a preferred embodiment of the present invention, the battery further includes a lead wire, and the lead wire and the plurality of leads respectively The battery cells are connected, and the side faces of the upper case or the lower case are provided with lead holes through which the leads are led out.

According to a preferred embodiment of the present invention, the outer shape of the battery case includes a rectangular parallelepiped, a cube, a cylinder, and a sphere.

According to a preferred embodiment of the present invention, the battery core is encapsulated in an aluminum foil film into the same shape as the inside of the battery case, and is then loaded into the battery case.

According to a preferred embodiment of the present invention, the number of the leads is one or more, and the number of the lead holes is one or two of the side faces of the upper case or the lower case, and each lead hole has a lead wire passing through And the size of the lead hole is slightly larger than the outer peripheral size of the lead.

According to a preferred embodiment of the invention, the bottom of the lower casing is provided with a groove projecting from the plane of the bottom.

In order to solve the above technical problem, an embodiment of the present invention further provides a battery case, wherein the battery case includes an upper case and a lower case, and the upper case and the lower case are made of metal, the upper case and the upper case. The battery case is formed by laser full-circle corrugated sealing between the lower cases.

According to a preferred embodiment of the present invention, the side surface of the upper case or the lower case is provided with a lead hole for leading out the battery core lead.

Compared with the prior art, the battery and the battery case thereof provided by the invention have a battery case which is made of a metal material, and is formed by a laser full-circle corrugated seal to form a sealed cavity, and the battery core is disposed inside the battery case cavity. Since the battery case is made of metal material and laser welding process, the battery structure has the characteristics of high safety, good heat dissipation and strong sealing.

[Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following description will be made on the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in the drawings The drawings obtain other figures.

1 is a partial cross-sectional view showing a conventional battery package structure in the prior art;

2 is a schematic view showing the overall structure of a first embodiment of the battery of the present invention;

Figure 3 is a partial cross-sectional view showing the structure of the battery in the embodiment of Figure 2;

4 is a schematic structural view of a first embodiment of a method for soldering a battery can according to the present invention;

Figure 5 is a partial structural view showing the structure of the battery in the embodiment of Figure 2;

6 is a schematic structural view of a second embodiment of a method for soldering a battery can according to the present invention;

Figure 7 is a partial enlarged view of the structure B of the weld in the embodiment of Figure 6;

Figure 8 is an enlarged schematic view showing the structure of a welded portion of a third embodiment of a method for soldering a battery can according to the present invention;

Figure 9 is an enlarged schematic view showing the structure of a welded portion of a fourth embodiment of a method for soldering a battery can according to the present invention;

Figure 10 is an enlarged schematic view showing the structure of a welded portion of a fifth embodiment of a method for soldering a battery can according to the present invention;

Figure 11 is a partial cross-sectional view showing a second embodiment of the battery of the present invention;

Figure 12 is a partial cross-sectional view showing a third embodiment of the battery of the present invention;

FIG. 13 is a schematic diagram showing the structure of the sensor chip 400 in the embodiment of FIG.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

2 and FIG. 3, FIG. 2 is a schematic overall structural view of a first embodiment of the battery of the present invention; and FIG. 3 is a partial cross-sectional view showing the structure of the battery of the embodiment of FIG. 2. The battery includes, but is not limited to, the following structural elements: a battery cell 100 and a battery can 200.

Specifically, the battery case 200 further includes an upper case 210 and a lower case 220, wherein the upper case 210 and The material of the lower case 220 is metal, and the battery case 200 of the complete structure is formed by laser full-circle corrugated sealing between the upper case 210 and the lower case 220; the battery cell 100 is disposed in the battery case 200. 202 shows laser welding lines, and the specific structure of the welding form between the upper case 210 and the lower case 220 and the laser welding pattern 202 will be described in detail later.

Preferably, the upper shell 210 and the lower shell 220 are made of stainless steel because the stainless steel has the advantages of high strength, corrosion resistance and the like. The specific models of stainless steel are not listed here. The shape of the battery case 200 is not limited to the rectangular parallelepiped structure in the illustrated embodiment, and may include a square, a cylinder, a sphere, and other irregular shapes.

The battery cell 100 is encapsulated in an aluminum foil film to have the same or similar shape as the inside of the battery can 200, and is then housed in the battery can 200. Further preferably, the battery may include a plurality of sets of battery cells (indicated in the figure), and the plurality of sets of battery cells are disposed in the battery case 200.

The battery further includes a lead 110, which is respectively connected to a plurality of sets of battery cells, and a side of the lower case 220 is provided with a lead hole 221 through which the lead 110 is led out. Of course, in other embodiments, the lead holes may also be disposed on the upper case 210, which are within the understanding of those skilled in the art and will not be described in detail herein. The number of the lead wires 110 may be one or more. The number of the lead holes provided on the side of the upper case 210 or the lower case 220 may also be one or two. To ensure the overall sealing of the battery case 200, each lead hole is provided. Lead wires are passed through, and the size of the lead holes is slightly larger than the outer peripheral size of the leads.

Further preferably, the bottom of the lower casing 220 is provided with a recess 222 that protrudes from the bottom plane, and the function and specific structure with respect to the recess 222 will be described in detail in later embodiments.

In addition, the embodiment of the present invention further provides a battery case. For detailed technical features of the battery case, refer to the detailed description in the foregoing embodiment, and details are not described herein again.

The invention also provides a welding method for a battery case, which is to be composed of at least two partial groups The formed battery case is formed into a sealed cavity by laser full-circle corrugation. Please refer to the following examples for details.

Welding method embodiment 1

2 and FIG. 4, FIG. 4 is a schematic structural view of a first embodiment of a method for soldering a battery can according to the present invention, that is, a partially enlarged view of a structure A of a soldering portion in the embodiment of FIG. 2; in this embodiment, a battery case The welded sides (215 and 225) of the welded portion are arranged in abutting manner on the sides of the parallel battery case, the welded side 215 of the upper case 210 is bent at a right angle with respect to the top surface of the upper case, and the welded side 225 of the lower case 220 is straight. On the side, the welded side 215 corresponding to the upper case 210 encloses the welded side 225 of the lower case 220, and the laser welded pattern 202 is distributed in a wave shape on the outer side of the overlapping face of the welded sides on both sides.

Of course, the wave shape of the laser welding pattern 202 is not limited to the linear folding in the illustration in the embodiment, and may be other wavy linearity such as sinusoidal linearity, which is not within the scope of the person skilled in the art. An enumeration.

Please refer to FIG. 5 together. FIG. 5 is a partial schematic structural view of the battery structure in the embodiment of FIG. 2. Preferably, the lowest point of the undulation (i.e., laser weld pattern 202) spans the bottom edge 2151 of the weld rim 215. More preferably, the wavy line has a wavy centerline with the bottom edge 2151 of the welded edge 215, that is, the wavy line in FIG. 5 has the same height on both sides of the bottom edge 2151.

Preferably, the battery case 200 (including the upper case 210 and the lower case 220) is made of 0.07 mm thick stainless steel, and the laser welded spot diameter is 0.08 mm; the distance between adjacent peaks or troughs of the wave-shaped laser welded pattern 202 L is 0.16 mm.

The welded structure in this embodiment has the advantages that the upper and lower shells are easy to manufacture, the welded area (i.e., the overlapping area of the upper and lower welded sides) is large, and the sealing performance is good.

Welding method embodiment 2

Referring to FIG. 6 and FIG. 7, FIG. 6 is a schematic structural view of a second embodiment of a method for soldering a battery can according to the present invention; and FIG. 7 is a partial enlarged view of a structure B of the soldering portion in the embodiment of FIG. In this embodiment, the welded sides (215, 225) on both sides of the welded portion of the battery case extend outward along the side of the battery case, and the welded sides (215, 225) on both sides are overlapped and disposed, and the laser welded lines 202 are on both sides. Welded edge (215, 225) The outer sides of the overlapping faces are undulating.

Preferably, both side soldering edges (215, 225) are bent at right angles to the side of the battery case. Also preferably, the battery case 200 (including the upper case 210 and the lower case 220) is made of 0.07 mm thick stainless steel, laser The spot diameter of the weld is 0.08 mm; the distance between adjacent peaks or troughs of the wavy laser weld pattern 202 is 0.16 mm (not shown in the figure of this embodiment, see Fig. 5). The wave shape of the laser welding grain 202 is also not limited to the linear folding in the illustration in the embodiment, and may be other wavy linearity such as sinusoidal linearity.

The welded structure in this embodiment has the advantages that the upper and lower shells are easy to manufacture, the gap between the upper and lower shells is small during assembly, and the reliability of laser welding is high.

Welding method embodiment 3

Please refer to FIG. 8. FIG. 8 is an enlarged schematic view showing the structure of the welding portion of the third embodiment of the method for soldering the battery can according to the present invention. In the embodiment of FIG. 6, the welded edges (215, 225) on both sides are at right angles to the side of the battery case. Bending, the welded edge projects outwardly relative to the housing, which increases the peripheral dimensions of the battery case. Therefore, this embodiment is a modification of the embodiment of FIG. 6. On the basis of the embodiment of FIG. 6, after soldering The overlap is bent in the direction parallel to the side of the battery case to reduce the outer size of the battery case while making the battery case as a whole more beautiful.

Welding method embodiment 4

Referring to FIG. 9, FIG. 9 is an enlarged schematic view showing the structure of a welded portion of a fourth embodiment of a method for soldering a battery can according to the present invention. In this embodiment, one side of the welded portion of the battery can welded portion (in this embodiment, a lower welded side, and in other embodiments, an upper welded side) is provided with a connection formed by bending the outside of the battery case. The flange 225, the connecting flange 225 encloses the other side of the welded side 215 from the outside, and the welded sides (the flange 225 and the welded side 215) are overlapped and disposed in the side direction of the battery case, and the laser welding pattern 202 is The outer sides of the overlapping sides (215, 225) are undulated on the outer side of the overlapping faces.

Preferably, the material of the battery case 200 (including the upper case 210 and the lower case 220) is also 0.07 mm thick. The stainless steel has a spot diameter of 0.08 mm for laser welding; the distance between adjacent peaks or troughs of the wave-shaped laser welded pattern 202 is 0.16 mm (not shown in the figure of this embodiment, see Fig. 5). The wave shape of the laser welding grain 202 is also not limited to the linear folding in the illustration in the embodiment, and may be linear or sinusoidal linear or the like.

The welded structure in this embodiment has the advantages that the upper and lower shells are easy to manufacture and assemble, and the upper and lower shells can be manufactured by stretching, and the reliability of laser welding is also high.

Welding method embodiment 5

Referring to FIG. 10, FIG. 10 is an enlarged schematic view showing the structure of a welded portion of a fifth embodiment of a method for soldering a battery can according to the present invention. In this embodiment, one side welded side (in this embodiment, the upper welded side) of the welded portion of the battery case is provided with an n-shaped bent groove 215 which is integrally raised on the top of the upper case 210. The welding edge 225 on the other side is inserted into the bending groove 215 and abuts against the inner side surface of the bending groove 215, and the laser welding grain 202 is welded on both sides (the outer straight side and the welded side 225 of the bending groove 215). The outer surface of the abutment surface is wavy.

Preferably, the material of the battery case 200 (including the upper case 210 and the lower case 220) is also 0.07 mm thick stainless steel, and the spot diameter of the laser welding is 0.08 mm; between adjacent peaks or troughs of the wave-shaped laser welded pattern 202 The distance is 0.16 mm (not shown in the figure of this embodiment, see Fig. 5). The wave shape of the laser welding grain 202 is also not limited to the linear folding in the illustration in the embodiment, and may be linear or sinusoidal linear or the like.

The welded structure of this embodiment has the advantage that the upper casing 210 is flanged on the lower casing 220 in such a manner that it can be either a spin-on seal or a laser welded seal in this embodiment. The battery structure has good overall sealing and aesthetics.

Embodiments of the present invention also provide a battery case and a battery, and the shape of the battery case includes a rectangular parallelepiped, a cube, a cylinder, a sphere, and other irregular shapes. The bottom of the battery can also be provided with a recess that protrudes from the bottom plane (see the structure in Figure 3, and the effect and specific structure of the recess will be detailed in later embodiments). In addition, please refer to the above for the other parts of the battery case and the sealing method. The related description in the example is not described here. The battery provided by the embodiment of the present invention includes a battery core and the battery case described in the above embodiments. For the specific structural characteristics of the battery, please refer to FIG. 2 to FIG. 10 and its corresponding related description.

Further, an embodiment of the present invention further provides a battery. Referring to FIG. 11, FIG. 11 is a partial cross-sectional view showing a second embodiment of the battery of the present invention. The battery includes, but is not limited to, the following structural elements: a battery cell 100 and a battery can 200.

Specifically, the battery case 200 further includes an upper case 210 and a lower case 220, wherein the upper case 210 and the lower case 220 may be made of metal, and the upper case 210 and the lower case 220 are formed by laser full-circle corrugated sealing welding. The battery case 200 of a complete structure; the battery cell 100 is disposed in the battery case 200. 202 shows laser welding lines, and for the specific structure of the welding form between the upper case 210 and the lower case 220 and the laser welding pattern 202, refer to the detailed description in the above embodiment. It will not be repeated here.

Preferably, the bottom of the lower case 220 is provided with a groove 222 protruding from the bottom plane. The groove 222 may be in the form of a strip, a ring or the like distributed at the bottom of the lower case 220, and the number may also be one (ring) ) or multiple (rings). In order to overcome the impact of the battery explosion on the outside, the groove 222 is designed as an explosion-proof storage tank. When the battery core 100 is heated, impacted or short-circuited, the expanded volume is first filled in the explosion-proof storage tank. Further preferably, the side of the lower case 220 is further provided with a safety hole 300. When the battery cell 100 expands to a volume exceeding the volume of the explosion-proof storage tank, it is leaked from the safety hole 300 of the battery case. The charged electrolyte inside the battery core 100 can be effectively prevented from being directly emitted during an explosion. In addition, the safety hole 300 is not limited to being disposed on the lower case 220, and may be disposed on the upper case 210.

Referring to FIG. 12, FIG. 12 is a partial cross-sectional view showing a third embodiment of the battery of the present invention. In order to further control and detect the working condition inside the battery, the battery structure in this embodiment is provided with an inductive chip 400 inside the recess 222. The chip 400 is used to detect the internal condition of the battery to transmit information inside the battery case 2 to the control terminal.

Referring to FIG. 13, FIG. 13 is a schematic diagram showing the structure of the sensor chip 400 in the embodiment of FIG. The sensor chip 400 is further provided with a temperature sensor 410, a pressure sensor 420, and a signal output terminal 430. A through hole (not shown) for passing through the signal output end 430 is provided on the lower case 220. among them, The temperature sensor 410 is used to sense the temperature of the current battery cell 100; the pressure sensor 420 is used to sense whether the current battery core is thermally expanded, and transmits a signal to the sensing chip 400 for determining whether the expansion coefficient is overloaded; the sensing chip 400 Then, it is used to process the temperature and pressure signals of the current battery cell 100 detected by the temperature sensor 410 and the pressure sensor 420, and determine whether the battery core 100 is heated, impacted, short-circuited, etc., and output a signal through the signal output terminal 430. Whether the external circuit disconnects the current battery.

Preferably, the material of the upper shell 210 and the lower shell 220 may be stainless steel, because the stainless steel has the advantages of high strength, corrosion resistance and the like. The specific models of stainless steel are not listed here. The shape of the battery case 200 is not limited to a similar rectangular parallelepiped structure in the illustrated embodiment, and may include a square body, a cylinder, a sphere, and other irregularly shaped bodies.

Compared with the prior art, the battery provided by the present invention can temporarily store and buffer when the battery core has an explosion burst by providing a safety hole and an explosion-proof storage tank at the bottom of the battery case. In addition, the sensor chip is installed in the explosion-proof storage tank, which can be used for real-time detection inside the battery to further ensure the safe operation of the battery. Especially in high-power battery packs, which require long-term charging and high power, it is common practice to combine small batteries into large-capacity batteries. When individual batteries in the battery pack are exposed to heat, impact or short circuit, it is necessary to identify which battery has a problem in time, and cut off the corresponding small battery in time by an external circuit to protect the entire set of high-power batteries from damage.

The above description is only a part of the embodiments of the present invention, and is not intended to limit the scope of the present invention. Any equivalent device or equivalent process transformation made by using the description of the present invention and the contents of the drawings may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Claims

A battery, comprising: a battery core and a battery case, the battery case further comprising an upper case and a lower case, the upper case and the lower case are made of metal, the upper case and The battery case is formed by laser full-circle corrugated sealing welding between the lower shells, and the battery core is disposed in the battery case.
The battery according to claim 1, wherein the upper case and the lower case are made of stainless steel.
The battery according to claim 1, wherein said battery comprises a plurality of battery cells, and said plurality of battery cells are disposed in said battery case.
The battery according to claim 3, wherein the battery further comprises a lead wire, the lead wire is respectively connected to the plurality of battery cells, and a side of the upper case or the lower case is provided with a lead hole. The lead wires are taken out through the lead holes.
The battery according to claim 1, wherein the outer shape of the battery case comprises a rectangular parallelepiped, a square, a cylinder, and a sphere.
The battery according to claim 1, wherein the battery cell is encapsulated in an aluminum foil film to have the same inner shape as the battery case, and is then loaded into the battery case.
The battery according to claim 4, wherein the number of the leads is one or more, and the number of the lead holes of the upper or lower case is one or two, and each lead The holes have leads through them, and the size of the lead holes is slightly larger than the outer peripheral size of the leads.
The battery according to claim 1, wherein the bottom of the lower case is provided with a groove that protrudes from a plane of the bottom.
A battery case, characterized in that the battery case comprises an upper case and a lower case, the upper case and the lower case are made of metal, and the upper case and the lower case are passed through a laser full circumference A corrugated seal weld forms the battery can.
The battery can according to claim 9, wherein the upper case and the lower case are made of stainless steel.