WO2017113415A1 - Batterie, boîtier de batterie et procédé de soudage pour batterie - Google Patents

Batterie, boîtier de batterie et procédé de soudage pour batterie Download PDF

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Publication number
WO2017113415A1
WO2017113415A1 PCT/CN2015/100345 CN2015100345W WO2017113415A1 WO 2017113415 A1 WO2017113415 A1 WO 2017113415A1 CN 2015100345 W CN2015100345 W CN 2015100345W WO 2017113415 A1 WO2017113415 A1 WO 2017113415A1
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WO
WIPO (PCT)
Prior art keywords
battery case
battery
sides
welding
welded
Prior art date
Application number
PCT/CN2015/100345
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English (en)
Chinese (zh)
Inventor
文洁
何自坚
Original Assignee
深圳市大富精工有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市大富精工有限公司 filed Critical 深圳市大富精工有限公司
Priority to PCT/CN2015/100345 priority Critical patent/WO2017113415A1/fr
Priority to CN201580079811.8A priority patent/CN107615510B/zh
Publication of WO2017113415A1 publication Critical patent/WO2017113415A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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

Definitions

  • the present invention relates to the technical field of battery packaging, and in particular to a battery, a battery case, and a battery case soldering method.
  • 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:
  • the heat dissipation performance of the battery is poor, which is not conducive to combining into a high-power battery.
  • 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.
  • Embodiments of the present invention provide a battery, a battery case, and a battery case soldering method to solve the technical problems of poor battery safety, sealing performance, and heat dissipation in the prior art.
  • an embodiment of the present invention provides a method for soldering a battery case, wherein the welding method is to form a sealed cavity by laser full-circle corrugation of a battery case composed of at least two parts.
  • the step of forming a sealed cavity by laser full-weave corrugation of the battery case composed of at least two parts is specifically: the welded sides of the welded portion of the battery case are parallel to the battery case. The side overlaps are arranged in close proximity, and the laser welding lines are undulatingly distributed on the outer side of the overlapping faces of the welded sides on the two sides.
  • the battery case composed of at least two parts is passed through a laser
  • the step of forming the sealed cavity by the full-weave corrugated welding is specifically: the welded sides of the welded portion of the battery case extend outward along the side of the battery case, and the welded sides of the two sides are overlapped and disposed, and the laser welding lines are in the two The outer side of the overlapping side of the side welded side is wavy.
  • the method further comprises the step of bending the welded overlap surface in a direction parallel to the side of the battery case to reduce the outer size of the battery case.
  • the step of forming a sealed cavity by laser full-weave corrugation of the battery case composed of at least two parts is specifically: one side of the welded portion of the battery case is welded to the outside of the battery case a side connecting flange formed by the connecting flange, the connecting flange enclosing the welding side of the other side, and the welding edges of the two sides are overlapped and disposed in the side direction of the battery case, and the laser welding grain is welded on the two sides The outer sides of the overlapping faces are undulating.
  • the step of forming the sealed cavity by laser full-weave corrugation of the battery case composed of at least two parts is specifically: the welded side of the welded portion of the battery case is provided with an n-type The bending groove is inserted into the bending groove and abuts against the inner side surface of the bending groove, and the laser welding grain is distributed in a wave shape on the outer side of the abutting surface of the welded sides.
  • the battery case is made of 0.07 mm thick stainless steel, and the spot diameter of the laser welding is 0.08 mm; the distance between adjacent peaks or troughs of the wave-shaped laser welding line is 0.16 mm. .
  • the present invention also provides a battery case which is fabricated by any of the welding methods of the above embodiments.
  • the outer shape of the battery case includes a rectangular parallelepiped, a cube, a cylinder, and a sphere.
  • the bottom of the battery can is provided with a recess that protrudes from the plane of the bottom.
  • the present invention further provides a battery including a battery core and a battery case, the battery core being disposed in the battery case; and the battery case battery case utilizing any one of the above embodiments Made by welding method.
  • the battery, the battery case and the battery case welding method provided by the invention are selected
  • the metal material is used as the battery case, and the sealed cavity is formed by laser full-weave corrugated welding.
  • the battery case has small gaps in the upper and lower shells during assembly, high reliability of laser welding, good sealing performance and beautiful appearance of the battery case.
  • FIG. 1 is a partial cross-sectional view showing a conventional battery package structure in the prior art
  • FIG. 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;
  • FIG. 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;
  • FIG. 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.
  • FIG. 2 is a schematic overall structural view of a first embodiment of the battery of the present invention
  • 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.
  • 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 are made of metal, and the upper case 210 and the lower case 220 are completely formed by laser full-circle corrugated sealing welding.
  • 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.
  • 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.
  • 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.
  • 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.
  • an embodiment of the present invention further provides a battery case, and the detailed technical features of the battery case are as follows. The detailed description in the above embodiments is omitted here.
  • 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.
  • the invention also provides a welding method of a battery case, which is to form a sealed cavity by laser full-circle corrugation of a battery case composed of at least two parts. Please refer to the following examples for details.
  • 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.
  • 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.
  • 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.
  • FIG. 5 is a partial schematic structural view of the battery structure in the embodiment of FIG. 2.
  • the lowest point of the undulation i.e., laser weld pattern 202 spans the bottom edge 2151 of the weld rim 215.
  • 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.
  • 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.
  • FIG. 6 is a schematic structural view of a second embodiment of a method for soldering a battery can according to the present invention
  • FIG. 7 is a partial enlarged view of a structure B of the soldering portion in the embodiment of FIG.
  • 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.
  • the outer sides of the overlapping faces of the welded edges (215, 225) are wavy.
  • both side soldering edges (215, 225) are bent at right angles to the side of the battery case.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 9 is an enlarged view showing the structure of the welding portion of the fourth embodiment of the method for welding the battery can of the present invention. intention.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • An advantage of the welded structure in this embodiment is that the upper casing 210 is flanged on the lower casing 220.
  • the method 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).
  • the battery provided by the embodiment of the present invention includes a battery core and the battery case described in the above embodiments.
  • 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.
  • 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.
  • 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).
  • 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.
  • the side of the lower case 220 is further provided with a safety hole 300.
  • the safety hole 300 is not limited to being disposed on the lower case 220, and may be disposed on the upper case 210.
  • FIG. 12 is a partial cross-sectional view showing a third embodiment of the battery of the present invention; Steps control and detect the working condition inside the battery.
  • the battery structure in this embodiment is provided with a sensing chip 400 inside the recess 222.
  • the sensing chip 400 is used for detecting the internal condition of the battery, so as to transmit the information inside the battery case 2 to Control terminal.
  • 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.
  • 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 sensor chip 400 to determine whether the expansion coefficient is overloaded;
  • the chip 400 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 through the signal output terminal 430. Signals to the external circuit whether to disconnect the current battery.
  • 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.
  • 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.
  • 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.
  • the present invention provides a battery by providing a safety hole in the bottom of the battery case and
  • the explosion-proof storage tank can temporarily store and buffer when the battery core has expansion and burst.
  • 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.
  • high-power battery packs which require long-term charging and high power

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

L'invention a pour objet une batterie, un boîtier (200) de batterie et un procédé de soudage pour batterie, lequel procédé de soudage permet de former une cavité étanche au moyen d'un soudage au laser sur toute la circonférence du boîtier (200) de batterie formé par au moins deux parties. Les parties soudées des deux bords soudés (215, 225) du boîtier (200) de batterie se trouvent sur le côté parallèle du boîtier (200) de batterie superposées, des lignes (202) de soudure au laser sont ménagées sur le côté externe de la surface de superposition des deux bords soudés (215, 225) et présentent une partie en forme d'onde. L'utilisation du matériau métallique sélectionné pour le boîtier (200) de batterie et la formation d'une cavité étanche au moyen d'un soudage au laser sur toute la circonférence permettent, entre autres, de réduire la durée de l'assemblage de la coque supérieure et de la coque inférieure (210, 220) du boîtier (200) de batterie, et garantissent un soudage au laser relativement fiable tout en conférant au boîtier (200) de batterie une bonne étanchéité et en soignant l'esthétique de ce dernier.
PCT/CN2015/100345 2015-12-31 2015-12-31 Batterie, boîtier de batterie et procédé de soudage pour batterie WO2017113415A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2015/100345 WO2017113415A1 (fr) 2015-12-31 2015-12-31 Batterie, boîtier de batterie et procédé de soudage pour batterie
CN201580079811.8A CN107615510B (zh) 2015-12-31 2015-12-31 电池、电池壳以及电池壳焊接方法

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Application Number Priority Date Filing Date Title
PCT/CN2015/100345 WO2017113415A1 (fr) 2015-12-31 2015-12-31 Batterie, boîtier de batterie et procédé de soudage pour batterie

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