WO2022261833A1 - 电化学装置及用电设备 - Google Patents

电化学装置及用电设备 Download PDF

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Publication number
WO2022261833A1
WO2022261833A1 PCT/CN2021/100163 CN2021100163W WO2022261833A1 WO 2022261833 A1 WO2022261833 A1 WO 2022261833A1 CN 2021100163 W CN2021100163 W CN 2021100163W WO 2022261833 A1 WO2022261833 A1 WO 2022261833A1
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WO
WIPO (PCT)
Prior art keywords
recessed
casing
layer
electrochemical device
metal layer
Prior art date
Application number
PCT/CN2021/100163
Other languages
English (en)
French (fr)
Inventor
李晓峰
宋小芳
郭培培
林森
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202180011376.0A priority Critical patent/CN115176376A/zh
Priority to PCT/CN2021/100163 priority patent/WO2022261833A1/zh
Publication of WO2022261833A1 publication Critical patent/WO2022261833A1/zh

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • 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
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/141—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against humidity
    • 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
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
    • 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
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • 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 application relates to the field of electrochemical technology, in particular to an electrochemical device and electrical equipment.
  • the packaging bag of the battery is provided with a sealing part, which is used to seal the electrode assembly and the electrolyte in the packaging bag, so as to avoid leakage of the electrolyte and ensure the safety of the battery.
  • a sealing part which is used to seal the electrode assembly and the electrolyte in the packaging bag, so as to avoid leakage of the electrolyte and ensure the safety of the battery.
  • the current industry generally uses a hot pressing process to combine the inner layers of the packaging bag (such as the PP layer) to form the packaging part.
  • the head of the hot pressing tool used in this process is designed to be flat, and the surface of the package formed after the hot pressing process is generally flat.
  • the sealing effect depends on the bonding strength of the inner layer, and the pulling force such as battery expansion is relatively large.
  • the already bonded inner layer is also easy to separate, resulting in the formation of a leakage channel in the packaging part, which affects the sealing effect.
  • the sealing part is prone to wrinkles, which not only affects the bonding force of the inner layer, Moreover, leakage channels are easily formed at the folds, which further leads to poor sealing effect.
  • the embodiment of the present application provides an electrochemical device and electrical equipment, which are used to improve the problem of poor sealing effect of the packaging part caused by the low bonding strength of the inner layer of the packaging bag.
  • an embodiment of the present application provides an electrochemical device, including an electrode assembly and a packaging bag for accommodating the electrode assembly.
  • the packaging bag includes a first shell and a second shell. At least one sealing edge of the first casing and at least one sealing edge of the second casing are stacked along the first direction, and combined to form the sealing part of the packaging bag.
  • the encapsulation part is a recessed part arranged along the first direction. The recessed portion is an area where at least one of the first case and the second case is recessed toward the other. .
  • the pressure applied to the depression is greater than the pressure applied to other areas, and the bonding strength between the first housing and the second housing in the depression is higher, which is conducive to improving the sealing effect of the package; and, in the process of forming the depression
  • the housing in the nearby area is pulled toward the recessed area, which is beneficial to prevent the packaging part from being wrinkled, reduces the risk of forming a liquid leakage channel, and further improves the sealing effect.
  • the first casing includes a first insulating layer, a first metal layer, and a first fusion layer
  • the second casing includes a second insulation layer, a second metal layer, and a second fusion layer
  • the first fusion layer Combined with the second fusion layer to form an encapsulation part.
  • the first casing includes a first insulating layer, a first metal layer, and a first fusion layer
  • the second casing includes a second insulation layer, a second metal layer, and a second fusion layer, and in the recess
  • the first metal layer is combined with the second metal layer
  • the first fusion layer is combined with the second fusion layer in the area of the encapsulation part except the recessed part.
  • the depression is subjected to greater pressure, so that the first fusion layer and the second fusion layer are pressed toward the adjacent area until the first metal layer and the second metal layer are combined, and then the two can be joined by ultrasonic welding, for example.
  • Welding of the metal layer can make the bonding strength of the first shell and the second shell in the concave part higher, and further improve the sealing effect of the package part.
  • the recessed portion is disposed on the first housing, and/or, the second housing.
  • the recesses are arranged symmetrically on the first casing and on the second casing, and/or are arranged alternately.
  • the recesses are distributed at intervals in the packaging part.
  • the shape of the concave part is at least one of circle, square and triangle.
  • the distance between the edge of any recessed portion and the edge of the encapsulation portion is 1/10 ⁇ 1/5 of the width of the encapsulation portion.
  • the minimum distance between the edge of the concave portion and the width edge of the encapsulation portion is greater than or equal to 2 mm.
  • the recessed part is not arranged on the edge of the packaging part, and the recessed part has a certain distance from the main body part that accommodates the electrode assembly and the electrolyte (that is, the recessed part has a certain distance from the edge of the packaging part facing the electrode assembly inside the packaging bag), which can Prevent the electrolyte from contacting the metal layer (first metal layer and/or second metal layer) in the recessed area, prevent the electrolyte from corroding the metal layer, reduce the risk of liquid leakage, and prevent the heat and pressure generated by the hot pressing process from affecting the main body , can reduce the defect of the main body; at the same time, the recessed part is not arranged on the edge of the packaged part, and the recessed part has a certain distance from the outer end surface of the packaged part (that is, the recessed part has a certain distance from the side of the packaged part facing the external environment) , can prevent moisture in the external environment from contacting the metal layer (first metal layer and/or second metal layer) in the recessed area, prevent
  • the sum of the areas of the recessed parts is 30%-70% of the area of the package part.
  • an electrical device provided by an embodiment of the present application includes a load and the electrochemical device described in any one of the above, and the electrochemical device supplies power to the load.
  • the pressure applied to the recessed part is greater than the pressure applied to other areas, and the bonding strength of the first case and the second case in the recessed part is high, which is conducive to improving packaging and, in the process of forming the recessed part, the casing located in the area near the recessed part is pulled toward the recessed area, which is beneficial to prevent the packaging part from wrinkling, thereby reducing the risk of forming a leakage channel, and further improving the packaging Internal sealing effect.
  • FIG. 1 is a perspective view of an electrochemical device according to an embodiment of the present application.
  • Fig. 2 is the enlarged schematic diagram of the structure of region I shown in Fig. 1;
  • Fig. 3 is a top view of the electrochemical device shown in Fig. 1;
  • Fig. 4 is a side view of the electrochemical device shown in Fig. 1;
  • Fig. 5 is a schematic cross-sectional view of the first embodiment of the region II shown in Fig. 4;
  • Fig. 6 is a schematic cross-sectional view of a second embodiment of the region II shown in Fig. 4;
  • Fig. 7 is a schematic cross-sectional view of a third embodiment of the region II shown in Fig. 4;
  • Fig. 8 is a schematic cross-sectional view of a fourth embodiment of the region II shown in Fig. 4;
  • Fig. 9 is a schematic cross-sectional view of a fifth embodiment of the region II shown in Fig. 4;
  • FIG. 10 is a schematic structural diagram of an electrochemical device according to another embodiment of the present application.
  • An electrochemical device 1 includes a packaging bag 10 , a tab 20 , and an electrode assembly (not shown).
  • the electrode assembly includes a positive pole piece and a negative pole piece, and a separator disposed between the positive pole piece and the negative pole piece.
  • the electrode assembly can be formed by winding or stacking several pole pieces.
  • One end of the tab 20 extends into the packaging bag 10 and is electrically connected to the pole piece of the corresponding polarity.
  • the other end of the tab 20 extends from one side of the packaging bag 10. It can be seen that, for example, in the orientation shown in FIG. 3 , the tab 20 protrudes from the upper side of the packaging bag 10 .
  • the tab 20 is electrically connected to the pole piece of the corresponding polarity, including the direct connection between the tab 20 and the pole piece, for example, the tab 20 is welded or integrally formed with the current collector and directly protrudes from the pole piece; It includes the indirect connection between the tab 20 and the pole piece, for example, the connection between the tab 20 and the pole piece is connected through a welding adapter piece and extends out of the packaging bag 10 .
  • the tab 20 includes a first tab 21 and a second tab 22 , the first tab 21 is a negative tab, and the second tab 22 is a positive tab.
  • the first tab 21 is electrically connected to the negative pole piece and extends from the inside of the packaging bag 10 to the outside of the packaging bag 10 .
  • the second tab 22 is electrically connected to the positive pole piece and extends from the inside of the packaging bag 10 to the outside of the packaging bag 10 .
  • the first tab 21 may be a positive tab
  • the second tab 22 may be a negative tab. In some parts of this article, one of them is taken as an example to describe the structure of the tab 20 .
  • the packaging bag 10 surrounds the shape of the electrochemical device 1 and can be used to define the appearance of the electrochemical device 1 .
  • the packaging bag 10 includes a main body portion 11 and a packaging portion 12 .
  • the main body 11 is provided with a receiving chamber (not shown in the figure), and the electrode assembly and the electrolyte are arranged in the receiving chamber, which improves the protection effect and safety.
  • the package part 12 and the tab 20 extend from one end of the main body part 11 .
  • the sealing part 12 is used to seal the end of the main body part 11 to prevent electrolyte leakage and impurities such as water and oxygen from entering the packaging bag 10 .
  • the packaging part 12 also seals the protruding area of the tab 20 to realize the sealing of the junction of the packaging bag 10 and the tab 20.
  • the tab 20 protrudes from the packaging area of the packaging part 12, which can be called the top sealing area. In the scene shown in FIG. 3 , the tab 20 protrudes from the upper end of the main body 11 , and the top sealing area is set on the upper end of the main body 11 .
  • the packaging bag 10 includes a first shell 11a and a second shell 11b, at least one sealing edge of the first shell 11a and at least one sealing edge of the second shell 11b are stacked along the first direction x, and are combined to form a packaging part 12.
  • a packaging part 12 For example, please refer to FIG. 1 , FIG. 3 and FIG. 4 , along the first direction x, the left sealing edge of the first shell 11a and the left sealing edge of the second shell 11b are stacked and combined, the first The right sealing edge of the casing 11a and the right sealing edge of the second casing 11b are stacked and combined, and the upper sealing edge of the first casing 11a and the upper sealing edge of the second casing 11b are stacked and arranged. Combine.
  • the first direction x is defined as the thickness direction of the packaging portion (i.e. the thickness direction of the electrochemical device shown in Figure 4), and the width direction of the packaging portion is the second direction y (i.e. the width direction of the electrochemical device shown in Figure 3) , the length direction of the packaging part is the third direction z (that is, the length direction of the electrochemical device shown in FIG. 3 ).
  • the package part 12 is provided with a recessed part 121 which is a region where at least one of the first case 11 a and the second case 11 b is recessed toward the other.
  • a recessed part 121 which is a region where at least one of the first case 11 a and the second case 11 b is recessed toward the other.
  • the first casing 11a is recessed toward the second casing 11b
  • the second casing 11b is recessed toward the first casing 11a
  • the concave portion 121 is provided at the second A housing 11a and a second housing 11b.
  • the concave portion 121 of the first housing 11 a and the concave portion 121 of the second housing 11 b are arranged symmetrically.
  • the recessed portion 121 of the first housing 11a and the recessed portion 121 of the second housing 11b are not symmetrically arranged, for example, along the first direction x, the recesses 121 on the two housings
  • the recessed parts 121 are arranged in a staggered manner, which can increase the area occupied by the recessed parts 121 on the entire package part 12 , and further improve the sealing effect of the package part 12 .
  • the recessed portion 121 is provided on the first shell 11a, and the second shell 11b is not recessed, and is generally flat .
  • the second housing 11b is recessed toward the first housing 11a, and the recessed portion 121 is provided on the second housing 11b, while the first housing 11a is not recessed, and is generally flat .
  • the pressure applied to the recessed part 121 is greater than the pressure applied to other areas, and the packaging part 12 is not recessed in other areas, and can be flat as a whole, which is hereinafter referred to as a non-recessed area.
  • the bonding strength of the first housing 11a and the second housing 11b at the recessed portion 121 is higher, which is more conducive to improving the sealing effect of the packaging portion 12;
  • the casing without the recessed portion 121) is pulled toward the recessed portion 121, which can reduce the wrinkles of the packaging portion 12, reduce the risk of forming a leakage channel, and further improve the sealing effect of the packaging portion 12.
  • the packaging bag 10 can be formed by a hot pressing process to form the sealing part 12.
  • the sealing head used in the hot pressing process includes two parts. The first part of the sealing head protrudes from the second part and is used to form the concave part 121.
  • the head can be designed as a flat surface for hot pressing to form a non-recessed area. These two parts can be implemented as a single head formed integrally, or as two heads, which can be used simultaneously in one hot pressing process, or can be used independently in different hot pressing processes.
  • the two parts of the head can be used to form the packaging part 12 in the same hot pressing process; or, the first part of the head can be used to form the recessed part 121 in the first hot pressing process, Then use the second part of the head to form the non-recessed area in the second hot-pressing process; or, use the second part of the head to form the non-recessed area in the first hot-pressing process, and then use the second part of the head to form the non-recessed area in the second hot-pressing process During the process, the first part of the head is used to form the recessed portion 121 .
  • the first casing 11a includes a first insulating layer 111 , a first metal layer 112 and a first fusion layer 113
  • the second casing 11b includes a second fusion layer 114 , a first fusion layer 113
  • Two metal layers 115 and a second insulating layer 116 are examples of the first casing 11a and the second casing 11b.
  • the recessed portion 121 includes a first insulating layer 111, a first metal layer 112, a second metal layer 115 and a second insulating layer 116, and the first metal layer 112 and the second metal layer 115 are combined; non-recessed The region includes a first insulating layer 111, a first metal layer 112, a first fusion layer 113, a second fusion layer 114, a second metal layer 115 and a second insulation layer 116, the first fusion layer 113 and the second fusion layer 114 are in phase combined.
  • the depression 121 is applied with greater pressure, so that the first fused layer 113 and the second fused layer 114 are pressed toward the nearby area until the first metal layer 112 and the second metal layer 115 are combined, such as thermocompression fusion, Then, the two metal layers are welded by ultrasonic welding, and the bonding strength between the first shell 11 a and the second shell 11 b at the recessed portion 121 is higher, further improving the sealing effect.
  • the first metal layer 112 and the second metal layer 115 are combined, and in the non-recessed area, the first fused layer 113 and the second fused layer 114 are fused, and the number of fused structural layers is large, which can also The bonding strength between the first casing 11a and the second casing 11b is increased to improve the sealing effect.
  • the thickness is only thinned, and the first metal The layer 112 and the second metal layer 115 are not combined, but the first fusion layer 113 and the second fusion layer 114 are combined to form the encapsulation part 12 .
  • the recessed part 121 formed by the combination of the first metal layer 112 and the second metal layer 115 may be included, and the first fusion layer 113 and the second fusion layer 114 may also exist.
  • the recessed part 121 is formed in combination.
  • the electrochemical device 1 includes any device that undergoes an electrochemical reaction, such as all kinds of primary batteries, secondary batteries, fuel cells, solar cells, or capacitors.
  • the electrochemical device 1 is a lithium secondary battery, a sodium secondary battery, a zinc secondary battery, or the like.
  • the lithium secondary battery may include a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, or a lithium ion polymer secondary battery.
  • the packaging bag 10 may include a nylon layer, an aluminum layer and a PP layer.
  • the first insulating layer 111 and the second insulating layer 116 are respectively nylon layers
  • the first metal layer 112 and the second metal layer 115 are respectively aluminum layers
  • the first fusion layer 113 and the second fusion layer 114 are respectively PP layers.
  • the pressure applied to the recessed part 121 is greater than that applied to other areas until the upper and lower aluminum layers are in contact, and then ultrasonic welding can be used.
  • the two aluminum layers welded together act as a seal reinforcement that provides greater resistance to pulling.
  • the shape of the recessed part 121 is the same as that of the head forming the recessed part 121, and the shape may be at least one of a regular polygon or an irregular polygon, for example, a concave
  • the portion 121 may be at least one of circular, trapezoidal, rectangular, and triangular.
  • the concave portion 121 is circular to prevent the packaging bag 10 from being broken due to heat and pressure.
  • the thickness of the recessed part 121 is d 1
  • the thickness of other regions is d 2 , d 1 ⁇ d 2 , for example, as shown in FIG.
  • d 3 is the thickness of the first fusion layer 113
  • d 4 is the thickness of the second fusion layer 114 . That is to say, the thickness reduced by hot pressing deformation is the thickness of the two fusion layers.
  • d 0 /6 ⁇ d 2 -d 1 ⁇ d 0 /2
  • d 0 is the sum of the thicknesses of the first shell 11a and the second shell 11b, that is to say, the thermal compression deformation is reduced
  • the thickness is 1/2 to 1/6 of the thickness of the packaging bag 10, avoiding too much deformation, which helps to avoid cracks in the packaging bag 10 (including the aluminum-plastic film) caused by the hot pressing process.
  • the first shell 11a forms a recess 21
  • the second shell 11b is hot-pressed with a flat head, and d 4 -d 3 ⁇ d 3 at this time.
  • the second shell 11b forms a recess 121
  • the first shell 11a is hot-pressed with a flat head, and d 4 -d 3 ⁇ d 4 at this time.
  • the thickness of the first metal layer 112 and the second metal layer 115 after fusion is d 5
  • the thickness of the first metal layer 112 is d 6
  • the second The thickness of the metal layer 115 is d 7 , which satisfies: d 5 ⁇ d 6 +d 7 .
  • the sum of the thicknesses of the two metal layers after fusion is smaller than the sum of the thicknesses before fusion, the two metal layers are fully fused, and the bonding strength is higher.
  • the thickness of one or more structural layers in non-recessed regions may be reduced because the recessed portion 121 pulls the shell in the vicinity when pressurized.
  • the thickness d 61 of the first metal layer 112 in the recessed portion 121 may be less than or equal to its thickness d 6 in the non-recessed area, that is, d 61 ⁇ d 6
  • the thickness d of the second metal layer 115 in the recessed portion 121 71 may be less than or equal to its thickness d 7 in the non-recessed area, that is, d 71 ⁇ d 7
  • the thickness d 31 of the first insulating layer 111 in the recessed portion 121 may be less than or equal to its thickness d 32 in the non-recessed area, That is, d 31 ⁇ d 32
  • the thickness d 41 of the second insulating layer 116 in the recessed portion 121 may be less than or equal to its thickness d 42 in the non-recessed area, that is, d 41 ⁇ d 42 .
  • the sum of the areas of the recessed parts 121 is 30%-70% of the area of the package part.
  • the sum of the areas of the recessed part 121 is 50% to 70% of the area of the encapsulation part. In this way, although the thickness of each layer in the recessed part 121 becomes smaller, the area of the non-recessed area is larger, which can still provide a strong The anti-tear ability ensures the sealing effect of the packaging part 12 .
  • the recessed part 121 is not arranged on the edge of the package part 12, and W is the distance from the edge of any recessed part 121 to the package part 12.
  • the distance from the width edge is W.
  • W is the distance between the concave portion 121 closest to the main body portion 11 and the width edge of the package portion 12 , which is only for exemplary illustration.
  • the width of the encapsulation portion 12 is D, where D/10 ⁇ W ⁇ D/5. In this way, the recessed portion 121 has a certain distance from the edge of the packaging portion 12 , which can prevent the electrolyte contained in the main body portion 11 from contacting the metal layer in the recessed area and affecting the sealing performance.
  • the recessed portion 121 has a certain distance from the main body 11 that accommodates the electrode assembly and the electrolyte, which can prevent the electrolyte from contacting the metal layer (the first metal layer and/or the second metal layer) of the recessed portion 121, and prevent the electrolyte from corroding the metal layer. , reduce the risk of liquid leakage, and prevent the heat and pressure generated in the thermocompression fusion process from affecting the main body 11 , which is beneficial to reduce the defects of the main body 11 .
  • W may also be the distance from the concave portion 121 closest to the outer end surface of the package part to the width edge of the package part 12 .
  • the concave portion is not arranged on the edge of the packaging portion, and the concave portion has a certain distance from the outer end surface of the packaging portion (that is, the concave portion has a certain distance from the side of the packaging portion facing the external environment), which can prevent water in the external environment from The air is in contact with the metal layer (the first metal layer and/or the second metal layer) in the recessed area to prevent external water vapor from corroding the metal layer and entering the packaging bag, which will affect the performance of the electrolyte.
  • the minimum distance between the side of the concave portion 121 facing the main body 11 and the main body 11 is greater than 2 mm.
  • the radius of the circle is R
  • the distance between the side of the concave portion 121 facing the main body 11 and the main body 11 is W, which satisfies W min ⁇ R+2mm, and W min is W.
  • the minimum value, the units of R and W are mm.
  • the shape of the main body 11 can be determined according to actual needs, and the embodiments of the present application are not limited thereto.
  • the aforementioned encapsulating portion 12 and its recessed portion 121 may be disposed at at least one end of the main body 11 , which is beneficial to improving the sealing effect of the main body 11 at multiple ends.
  • the encapsulation portion 12 and its recessed portion 121 are disposed at both left and right ends of the main body portion 11 .
  • any encapsulation part 12 may be provided with a plurality of recessed parts 121. As shown in FIG. Cloth or random arrangement is beneficial to improve the sealing effect of the package part 12 .
  • the packaging part 12 can be provided with a single recessed part 121, as shown in FIG. set up.
  • the area of the single recessed portion 121 is larger, and the fusion area of the first metal layer 112 and the second metal layer 115 is larger, which is beneficial to improve the sealing effect of the package portion 12 .
  • the embodiment of the present application additionally provides an electrical device, which includes a load and an electrochemical device 1 , and the electrochemical device 1 supplies power to the load.
  • the application of the electrochemical device 1 of the present application is not particularly limited, and it can be used in any electronic device known in the prior art.
  • the electrochemical device 1 of the present application can be used in, but not limited to, notebook computers, pen-input computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, heads-up Wearable stereo headphones, VCRs, LCD TVs, portable cleaners, portable CD players, mini discs, transceivers, electronic organizers, calculators, memory cards, portable tape recorders, radios, backup power supplies, motors, automobiles, motorcycles, Power-assisted bicycles, bicycles, lighting equipment, toys, game consoles, clocks, electric tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
  • the electrical device has the electrochemical device 1 of any of the foregoing embodiments, the electrical device can produce the beneficial effects that the electrochemical device 1 of the corresponding embodiment has.
  • an element defined by the phrase "comprising a" does not preclude the existence of other identical elements in the process, method, article, or device that includes the element.
  • Components, features, and elements with the same name may have the same meaning, or may have different meanings, and the specific meaning shall be determined based on the explanation in the specific embodiment or further combined with the context in the specific embodiment.

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Abstract

本申请公开一种电化学装置及用电设备。电化学装置的包装袋包括第一壳体和第二壳体，第一壳体的至少一封印边和第二壳体的至少一封印边沿第一方向层叠设置，且相结合形成包装袋的封装部，封装部沿所述第一方向设置凹陷部，凹陷部为第一壳体和第二壳体中至少一者朝向另一者凹陷的区域，第一方向为所述封装部的厚度方向。本申请能够改善封装部的密封效果。

Description

电化学装置及用电设备 技术领域
本申请涉及电化学技术领域，具体涉及一种电化学装置及用电设备。
背景技术
电池的包装袋设置有封装部，用于将电极组件和电解液封装于包装袋内，以避免电解液泄露以及确保电池的安全性。以软包电池为例，当前业界一般采用热压工艺使得包装袋的内层(例如PP层)相结合以形成封装部。但这种工艺所采用的热压工具的封头设计为平面，经过热压工序后形成的封装部的表面整体上为平面，密封效果取决于内层的结合强度，在电池膨胀等拉扯力较大情况时，已经结合的内层也容易分开，导致封装部形成漏液通道，影响密封效果不佳，另外，当内层不平整时，封装部容易产生褶皱，不仅影响内层的结合力，而且褶皱处容易形成漏液通道，进一步导致密封效果不佳。
发明内容
本申请实施例提供一种电化学装置及用电设备，用于改善包装袋的内层结合强度不高导致的封装部密封效果不佳的问题。
第一方面，本申请实施例提供一种电化学装置，包括电极组件和收容电极组件的包装袋。包装袋包括第一壳体和第二壳体。第一壳体的至少一封印边和第二壳体的至少一封印边沿第一方向层叠设置，且相结合形成包装袋的封装部。封装部沿第一方向设置的凹陷部。凹陷部为第一壳体和第二壳体中至少一者朝向另一者凹陷的区域。。
施加给凹陷部的压力大于施加给其他区域的压力，第一壳体和第二壳体在凹陷部的结合强度更高，有利于改善封装部的密封效果；并且，在形成凹陷部的过程中附近区域的壳体被朝向凹陷区域拉扯，有利于防止封装部产生褶皱，降低形成漏液通道的风险，进一步改善密封效果。
在一些实施方式中，第一壳体包括第一绝缘层、第一金属层和第一融合层， 第二壳体包括第二绝缘层、第二金属层和第二融合层，第一融合层和第二融合层相结合形成封装部。
在一些实施方式中，第一壳体包括第一绝缘层、第一金属层和第一融合层，第二壳体包括第二绝缘层、第二金属层和第二融合层，在凹陷部，第一金属层和第二金属层相结合，在封装部的除凹陷部之外的区域，第一融合层和第二融合层相结合。凹陷部被施加更大的压力，使得第一融合层和第二融合层被朝向附近区域挤压，直至第一金属层和第二金属层相结合，然后可以采用例如超声波焊接方式将这两个金属层焊接，能够使得第一壳体和第二壳体在凹陷部的结合强度更高，进一步改善封装部的密封效果。
在一些实施方式中，凹陷部设置在第一壳体，和/或，第二壳体。
在一些实施方式中，沿第一方向，凹陷部在第一壳体上和第二壳体上对称设置，和/或，交错设置。
在一些实施方式中，凹陷部在封装部间隔分布。
在一些实施方式中，凹陷部的形状呈圆形、方形、三角形中的至少一种。
在一些实施方式中，沿第二方向，任一凹陷部的边缘距封装部的边缘的距离为封装部宽度的1/10～1/5。可选地，凹陷部的边缘距封装部的宽度边缘的最小距离大于或等于2mm。凹陷部未设于封装部的边缘，凹陷部与收容电极组件和电解液的主体部具有一定距离(即凹陷部距离封装部朝向包装袋内部电极组件的一侧的边缘有一定的距离)，能够防止电解液与凹陷区域的金属层(第一金属层和/或第二金属层)接触，防止电解液腐蚀金属层，降低漏液风险，并且，防止热压工序产生的热量及压力影响主体部，能够降低主体部的缺陷；同时，凹陷部未设于封装部的边缘，凹陷部与封装部的外端面具有一定的距离(即凹陷部距离封装部朝向外界环境的一侧有一定的距离)，能够防止外界环境中的水气与凹陷区域的金属层(第一金属层和/或第二金属层)接触，防止外界水气侵蚀金属层并进入包装袋，对电解液性能带来影响。
在一些实施方式中，在任一的封装部的一侧表面，凹陷部的面积之和为封装部的面积的30％～70％。
第二方面，本申请实施例提供的一种用电设备，包括负载以及上述任一项所述的电化学装置，该电化学装置为负载供电。
在本申请实施例的电化学装置及用电设备中，施加给凹陷部的压力大于施加给其他区域的压力，第一壳体和第二壳体在凹陷部的结合强度高，有利于改善封装部的密封效果；并且，在形成凹陷部的过程中，位于凹陷部附近的区域的壳体被朝向凹陷区域拉扯，有利于防止封装部产生褶皱，从而降低形成漏液通道的风险，进一步改善封装部的密封效果。
附图说明
图1是本申请一实施例的电化学装置的立体图；
图2是图1所示区域I的结构放大示意图；
图3是图1所示的电化学装置的俯视图；
图4是图1所示的电化学装置的侧视图；
图5是图4所示的区域II第一实施例的截面示意图；
图6是图4所示的区域II第二实施例的截面示意图；
图7是图4所示的区域II第三实施例的截面示意图；
图8是图4所示的区域II第四实施例的截面示意图；
图9是图4所示的区域II第五实施例的截面示意图；
图10是本申请另一实施例的电化学装置的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合各个实施例及各个实施例的附图，对本申请技术方案进行清楚、完整地描述。显然，所描述实施例仅是一部分实施例，而非全部。基于本申请中的实施例，在不冲突的情况下，下述各个实施例及其技术特征可以相互组合。
请一并参阅图1至图5所示，本申请一实施例的电化学装置1包括包装袋10、极耳20、以及电极组件(图未示)。
在电化学装置1具有正负极性的场景中，电极组件包括正极极片和负极极 片、以及设置于正极极片和负极极片之间的隔离膜。电极组件可以由若干极片卷绕或者堆叠形成，极耳20的一端伸入包装袋10内，并与对应极性的极片电连接，极耳20的另一端从包装袋10的一侧伸出，例如，在图3所示的摆放方位中，极耳20从包装袋10的上侧伸出。应当理解的是，极耳20与对应的极性的极片电连接，包括了极耳20和极片直接连接，例如极耳20与集流体焊接或者一体成型而直接从极片伸出；还包括了极耳20和极片间接连接，例如极耳20与极片之间通过焊接转接片连接并伸出包装袋10。
极耳20包括第一极耳21和第二极耳22，第一极耳21为负极极耳，第二极耳22为正极极耳。第一极耳21与负极极片电连接，并从包装袋10内延伸至包装袋10外，第二极耳22与正极极片电连接，并从包装袋10内延伸至包装袋10外。在其他实施例中，第一极耳21可以为正极极耳，第二极耳22为负极极耳。本文的某些之处以其中一个为例，描述极耳20的结构。
包装袋10围设形成电化学装置1的形状，并可以用于限定电化学装置1的外观。包装袋10包括主体部11和封装部12。主体部11设有收容腔(图未标示)，电极组件及电解液设于收容腔内，提高防护效果及安全性。
封装部12和极耳20由主体部11的一端延伸出。封装部12用于密封主体部11的端部，避免电解液泄露及外界的水氧等杂质进入包装袋10内。封装部12也对极耳20伸出区域进行密封，实现包装袋10与极耳20结合处的密封，极耳20伸出于封装部12的封装区域，可称为顶封区。在图3所示的场景中，极耳20从主体部11的上端伸出，顶封区设于主体部11的上端。
包装袋10包括第一壳体11a和第二壳体11b，第一壳体11a的至少一封印边和第二壳体11b的至少一封印边沿第一方向x层叠设置，且相结合形成封装部12。例如，请参阅图1、图3和图4所示，沿第一方向x，第一壳体11a的左侧封印边和第二壳体11b的左侧封印边层叠设置并且相结合、第一壳体11a的右侧封印边和第二壳体11b的右侧封印边层叠设置并且相结合、以及第一壳体11a的上侧封印边和第二壳体11b的上侧封印边层叠设置并且相结合。定义第一方向x为封装部的厚度方向(即图4中所示电化学装置的厚度方向)，封装部的宽 度方向为第二方向y(即图3中所示电化学装置的宽度方向)，封装部的长度方向为第三方向z(即图3中所示电化学装置的长度方向)。
封装部12设置有凹陷部121，凹陷部121为第一壳体11a和第二壳体11b中至少一者朝向另一者凹陷的区域。例如，在图5、图6和图9所示的场景中，第一壳体11a朝向第二壳体11b凹陷，以及第二壳体11b朝向第一壳体11a凹陷，凹陷部121设置在第一壳体11a和第二壳体11b。如图5和图9所示，沿第一方向x(即封装部12的厚度方向)，第一壳体11a的凹陷部121和第二壳体11b的凹陷部121对称设置。如图6所示，沿第一方向x，第一壳体11a的凹陷部121和第二壳体11b的凹陷部121未对称设置，例如，沿第一方向x，这两个壳体上的凹陷部121交错设置，能够增大凹陷部121在整个封装部12上所占的面积，进一步提高封装部12的密封效果。
再例如，在图7所示的场景中，仅第一壳体11a朝向第二壳体11b凹陷，凹陷部121设置在第一壳体11a，而第二壳体11b未凹陷，整体上呈平面。又例如，在图8所示的场景中，仅第二壳体11b朝向第一壳体11a凹陷，凹陷部121设置在第二壳体11b，而第一壳体11a未凹陷，整体上呈平面。
施加给凹陷部121的压力大于施加给其他区域的压力，封装部12在其他区域未凹陷，整体上可以呈平面，下文称为非凹陷区域。第一壳体11a和第二壳体11b在凹陷部121的结合强度更高，更加有利于改善封装部12的密封效果；并且，在形成凹陷部121的过程中，附近区域的壳体(即未设置凹陷部121的壳体)被朝向凹陷部121拉扯，能够减少封装部12产生褶皱，降低形成漏液通道的风险，进一步改善封装部12的密封效果。
在一些实施例中，包装袋10可采用热压工艺形成封装部12，热压工艺采用的封头包括两部分，第一部分封头凸出于第二部分并用于形成凹陷部121，第二部分封头可以设计为平面，用于热压形成非凹陷区域。这两部分可实现为一体成型的单个封头，也可以实现为两个封头，这两个封头可以在一道热压制程中同时使用，也可以在不同的热压制程中各自独立使用。
应当理解的是，本申请的实施例可以在同一道热压制程中同时利用这两部 分封头形成封装部12；或者，在第一道热压制程中利用第一部分封头形成凹陷部121，然后在第二道热压制程中利用第二部分封头形成非凹陷区域；又或者，在第一道热压制程中利用利用第二部分封头形成非凹陷区域，然后在第二道热压制程中利用第一部分封头形成凹陷部121。
在一些实施例中，请参阅图5所示，第一壳体11a包括第一绝缘层111、第一金属层112以及第一融合层113，第二壳体11b包括第二融合层114、第二金属层115以及第二绝缘层116。沿第一方向x，凹陷部121包括第一绝缘层111、第一金属层112、第二金属层115和第二绝缘层116，第一金属层112和第二金属层115相结合；非凹陷区域包括第一绝缘层111、第一金属层112、第一融合层113、第二融合层114、第二金属层115和第二绝缘层116，第一融合层113和第二融合层114相结合。
凹陷部121被施加更大的压力，才能使得第一融合层113和第二融合层114被朝向附近区域挤压，直至第一金属层112和第二金属层115相结合，例如热压融合，然后采用例如超声波焊接方式将这两个金属层焊接，第一壳体11a和第二壳体11b在凹陷部121的结合强度更高，进一步提高密封效果。
另外，在凹陷部121内，第一金属层112和第二金属层115结合，在非凹陷区域内，第一融合层113和第二融合层114融合，融合的结构层数量较多，也能增大第一壳体11a和第二壳体11b的结合强度，提高密封效果。
应理解，在其他实施例中，如图9所示，在凹陷部121内，第一融合层113和第二融合层114虽然被朝向附近区域挤压，但仅是厚度变薄，第一金属层112和第二金属层115未结合，而是第一融合层113和第二融合层114相结合，形成封装部12。当然，在同一电化学装置1的封装部12中，既可以包括第一金属层112和第二金属层115相结合形成的凹陷部121，也存在第一融合层113和第二融合层114相结合形成的凹陷部121。
在具体场景中，电化学装置1包括发生电化学反应的任何装置，例如所有种类的一次电池、二次电池、燃料电池、太阳能电池或电容器。可选地，该电化学装置1是锂二次电池、钠二次电池和锌二次电池等。锂二次电池可包括锂 金属二次电池、锂离子二次电池、锂聚合物二次电池或锂离子聚合物二次电池。
以软包锂二次电池为例，包装袋10可包括尼龙层、铝层和PP层。第一绝缘层111和第二绝缘层116分别为尼龙层，第一金属层112和第二金属层115分别为铝层，第一融合层113和第二融合层114分别为PP层。
在采用热压工艺形成封装部12的场景中，施加给凹陷部121的压力大于施加给其他区域的压力，直至上下两个铝层接触，然后可采用超声波焊接。焊接的两个铝层作为密封加强结构，能够提供更强的抗拉扯能力。
在采用热压工艺的场景中，沿第一方向x，凹陷部121与形成该凹陷部121的封头的形状相同，该形状可以为规则多边形或者不规则多边形中的至少一种，例如，凹陷部121可以呈圆形、梯形、矩形、三角形中的至少一种。可选地，凹陷部121呈圆形，防止包装袋10因热压产生破裂。
凹陷部121的厚度为d 1，其他区域的厚度为d 2，d 1＜d 2，例如结合图5所示，在对第一壳体11a和第二壳体11b进行热压的场景中，可选地，d 3+d 4≤d 2-d 1，d 3为第一融合层113的厚度，d 4为第二融合层114的厚度。也就是说，热压形变所减小的厚度为两个融合层的厚度。
在一些场景中，d 0/6≤d 2-d 1≤d 0/2，d 0为第一壳体11a和第二壳体11b的厚度之和，也就是说，热压形变所减小的厚度为包装袋10厚度的1/2至1/6，避免形变太大，以此有利于避免热压工艺导致包装袋10(包括铝塑膜)产生裂痕。
应理解，沿第一方向x，其他实施例可以仅在包装袋10的一侧采用热压工艺。例如，请参阅图7所示，第一壳体11a形成凹陷部21，第二壳体11b采用平面封头热压，此时d 4-d 3≥d 3。又例如，请参阅图8所示，第二壳体11b形成凹陷部121，第一壳体11a采用平面封头热压，此时d 4-d 3≥d 4。
在一些实施例中，在凹陷部121内，第一金属层112和第二金属层115融合后的厚度为d 5，在非凹陷区域内，第一金属层112的厚度为d 6，第二金属层115的厚度为d 7，满足：d 5≤d 6+d 7。两个金属层融合后的厚度之和小于融合前的厚度之和，两个金属层充分融合，结合强度更高。
由于凹陷部121在加压时拉扯附近区域的壳体，因此，非凹陷区域的一个 或多个结构层的厚度可以变小。例如，第一金属层112在凹陷部121内的厚度d 61可以小于或等于其在非凹陷区域的厚度d 6，即d 61≤d 6；第二金属层115在凹陷部121内的厚度d 71可以小于或等于其在非凹陷区域的厚度d 7，即d 71≤d 7；第一绝缘层111在凹陷部121内的厚度d 31可小于或等于其在非凹陷区域的厚度d 32，即d 31≤d 32；第二绝缘层116在凹陷部121内的厚度d 41可以小于或等于其在非凹陷区域的厚度d 42，即d 41≤d 42。
在一些实施例中，在一个封装部的一侧表面上，凹陷部121的面积之和为封装部的面积的30％～70％。优选地，凹陷部121的面积之和为封装部的面积的50％～70％，如此，虽然凹陷部121中各层的厚度变小，但非凹陷区域的面积较大，仍然能够提供较强的抗拉扯能力，保障封装部12的密封效果。
请继续参阅图1至图5所示，沿第二方向y(即封装部的宽度方向)，凹陷部121未设置于封装部12的边缘，W为任一凹陷部121的边缘距封装部12的宽度边缘的距离为W。应理解，在图3和图10中，W为最靠近主体部11的凹陷部121距封装部12的宽度边缘的距离，仅供示例性展示。封装部12的宽度为D，D/10≤W≤D/5。如此，凹陷部121距离封装部12的边缘具有一定的距离，能够防止容纳于主体部11内的电解液等与凹陷区域的金属层接触而影响密封性能。
凹陷部121与收容电极组件和电解液的主体部11具有一定距离，能够防止电解液与凹陷部121的金属层(第一金属层和/或第二金属层)接触，防止电解液腐蚀金属层，降低漏液风险，并且，防止热压融合过程中产生的热量及压力影响主体部11，有利于降低主体部11的缺陷。
应当理解的是，W也可为最靠近封装部的外端面的凹陷部121距封装部12的宽度边缘的距离。如此，凹陷部未设于封装部的边缘，凹陷部与封装部的外端面具有一定的距离(即凹陷部距离封装部朝向外界环境的一侧有一定的距离)，能够防止外界环境中的水气与凹陷区域的金属层(第一金属层和/或第二金属层)接触，防止外界水气侵蚀金属层并进入包装袋，对电解液性能带来影响。
在一些实施例中，沿第二方向y，凹陷部121朝向主体部11的侧边与主体 部11的最小距离大于2mm。以凹陷部121呈圆形为例，圆形半径为R，凹陷部121朝向主体部11的侧边与主体部11之间的距离为W，满足W min≥R+2mm，W min为W的最小值，R和W的单位均为mm。
主体部11的形状可以根据实际需求而定，本申请的实施例不予以限定，例如图1至图5所示，主体部11整体上为矩形体，主体部11包括依次连接的第一端部、第二端部、第三端部和第四端部。前述封装部12及其凹陷部121可以设置于主体部11中的至少一端部，有利于提高主体部11在多个端部的密封效果。例如，在图1、图3和图10所示的实施例中，封装部12及其凹陷部121设置于主体部11的左右两个端部。
进一步可选地，任一封装部12可以设有多个凹陷部121，如图2所示，凹陷部121在封装部12间隔分布，例如可以呈蜂窝状排布或者两者之间等距离排布或者随机排布，有利于提高封装部12的密封效果。
在其他一些实施例中，在主体部11的一端部，封装部12可以设置单个凹陷部121，如图10所示，该单个凹陷部121沿封装部12的长度方向(第三方向z)延伸设置。该单个凹陷部121的面积较大，第一金属层112和第二金属层115融合的面积较大，有利于提高封装部12的密封效果。
本申请的实施例另外提供了一种用电设备，其包括负载以及电化学装置1，电化学装置1为负载供电。本申请的电化学装置1的用途没有特别限定，其可用于现有技术中已知的任何电子装置。在一些实施例中，本申请的电化学装置1可用于，但不限于，笔记本电脑、笔输入型计算机、移动电脑、电子书播放器、便携式电话、便携式传真机、便携式复印机、便携式打印机、头戴式立体声耳机、录像机、液晶电视、手提式清洁器、便携CD机、迷你光盘、收发机、电子记事本、计算器、存储卡、便携式录音机、收音机、备用电源、电机、汽车、摩托车、助力自行车、自行车、照明器具、玩具、游戏机、钟表、电动工具、闪光灯、照相机、家庭用大型蓄电池和锂离子电容器等。
由于用电设备具有前述任一实施例的电化学装置1，因此，该用电设备能够 产生对应实施例的电化学装置1具有的有益效果。
以上所述仅为本申请的部分实施例，并非因此限制本申请的专利范围，凡是利用本说明书及附图内容所作的等效结构变换，均同理包括在本申请的专利保护范围内。
在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素，此外，不同实施例中具有同样命名的部件、特征、要素可能具有相同含义，也可能具有不同含义，其具体含义需以其在该具体实施例中的解释或者进一步结合该具体实施例中上下文进行确定。
另外，在本申请实施例的描述中，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请相应实施例的技术方案和简化描述，而非指示或暗示装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
尽管本文采用术语“第一、第二、第三”等描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。本文中所使用的，单数形式“一”、“一个”和“该”旨在也包括复数形式。术语“或”和“和/或”被解释为包括性的，或意味着任一个或任何组合。仅当元件、功能、步骤或操作的组合在某些方式下内在地互相排斥时，才会出现该定义的例外。

Claims (10)

  1. 一种电化学装置，包括电极组件和收容电极组件的包装袋，其特征在于，所述包装袋包括第一壳体和第二壳体，所述第一壳体的至少一封印边和所述第二壳体的至少一封印边沿第一方向层叠设置，且相结合形成所述包装袋的封装部，所述封装部沿所述第一方向设置凹陷部，所述凹陷部为所述第一壳体和第二壳体中至少一者朝向另一者凹陷的区域。
  2. 根据权利要求1所述的电化学装置，其特征在于，所述第一壳体包括第一绝缘层、第一金属层和第一融合层，所述第二壳体包括第二绝缘层、第二金属层和第二融合层，所述第一融合层和所述第二融合层相结合以形成所述封装部。
  3. 根据权利要求1所述的电化学装置，其特征在于，所述第一壳体包括第一绝缘层、第一金属层和第一融合层，所述第二壳体包括第二绝缘层、第二金属层和第二融合层，在所述凹陷部，所述第一金属层和所述第二金属层相结合，在所述封装部的除所述凹陷部之外的区域，所述第一融合层和所述第二融合层相结合。
  4. 根据权利要求1所述的电化学装置，其特征在于，所述凹陷部设置在所述第一壳体，和/或，所述第二壳体。
  5. 根据权利要求4所述的电化学装置，其特征在于，沿所述第一方向，所述凹陷部在所述第一壳体上和第二壳体上对称设置，和或，交错设置。
  6. 根据权利要求1所述的电化学装置，其特征在于，所述凹陷部在所述封装部间隔分布。
  7. 根据权利要求1所述的电化学装置，其特征在于，所述凹陷部的形状呈圆形、方形、三角形中的至少一种。
  8. 根据权利要求1所述的电化学装置，其特征在于，沿第二方向，任一所述凹陷部的边缘距所述封装部的边缘的距离为所述封装部宽度的1/10～1/5，所述第二方向为所述封装部的宽度方向。
  9. 根据权利要求8所述的电化学装置，其特征在于，在任一所述的封装部的 一侧表面，所述凹陷部的面积之和为所述封装部的面积的30％～70％。
  10. 一种用电设备，其特征在于，包括负载、以及权利要求1至9中任一项所述的电化学装置，所述电化学装置为所述负载供电。
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