WO2024077814A1 - Shell structure, battery cell, battery, and electric device - Google Patents

Shell structure, battery cell, battery, and electric device Download PDF

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Publication number
WO2024077814A1
WO2024077814A1 PCT/CN2023/074106 CN2023074106W WO2024077814A1 WO 2024077814 A1 WO2024077814 A1 WO 2024077814A1 CN 2023074106 W CN2023074106 W CN 2023074106W WO 2024077814 A1 WO2024077814 A1 WO 2024077814A1
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WO
WIPO (PCT)
Prior art keywords
edge portion
layer
battery
shell structure
resin
Prior art date
Application number
PCT/CN2023/074106
Other languages
French (fr)
Chinese (zh)
Inventor
李博
滕国鹏
伍强
Original Assignee
江苏时代新能源科技有限公司
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Filing date
Publication date
Application filed by 江苏时代新能源科技有限公司 filed Critical 江苏时代新能源科技有限公司
Publication of WO2024077814A1 publication Critical patent/WO2024077814A1/en

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Classifications

    • 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
    • H01M50/116—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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/394—Gas-pervious parts or elements
    • 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 technical field of battery manufacturing, and in particular to a shell structure, a battery cell, a battery and an electrical device.
  • the present application provides a shell structure, a battery cell, a battery and an electrical device, aiming to improve the accuracy of the calibration equipment.
  • an embodiment of the present application provides a shell structure for a battery or a battery cell, the shell structure comprising a first sheet layer, a second sheet layer and a testing part, the first sheet layer comprising a first edge portion on the peripheral side, the second sheet layer being arranged opposite to the first sheet layer, the second sheet layer comprising a second edge portion on the peripheral side, the first edge portion and the second edge portion being fused to form a shell with an internal cavity, the area where the first edge portion and the second edge portion are fused to each other is a resin fusion area; the testing part passes through the resin fusion area, connecting the outside with the internal cavity, and is constructed to allow the gas in the internal cavity to be released to the outside through the testing part.
  • the first sheet layer and the second sheet layer of the embodiment of the present application can be understood as aluminum-plastic film, that is, the first sheet layer is a first aluminum-plastic film, and the second sheet layer is a second aluminum-plastic film.
  • this solution does not limit the structure, shape, size and other features of the test part, as long as the internal cavity can be connected to the outside.
  • the first fusible resin layer and the second fusible resin layer of the embodiment of the present application can both adopt hot melt adhesive layer.
  • a test portion is formed by hot melting in the edge of the shell structure used to form a battery cell or a battery, that is, in the resin fusion area between the first edge portion and the second edge portion.
  • the test section realizes the communication between the outside world and the internal cavity of the shell structure, so that no matter whether the pressure difference method or the helium detection method is adopted, by pressurizing or filling the internal cavity with helium, under the preset of the test section, it is possible to verify whether each verification device can detect the pressure difference change or the change of helium filling amount caused by the existence of the test section, that is, to verify the accuracy of the verification result of the corresponding verification device.
  • the test part is configured to be hot-melt molded along the width direction of the resin fusion zone.
  • This solution can produce a soft-pack battery heat-sealed zone with micropores of the same length as the width of the heat-sealed zone (i.e., the resin fusion zone) during the production process, accurately simulate the micropore defects in the heat-sealed zone of the battery, and improve the accuracy of the verification and detection system in detecting micro leaks.
  • the first sheet and the second sheet are integral sheets, and the integral sheet is folded or bent to form the first sheet and the second sheet that are relatively arranged.
  • the first sheet and the second sheet in the embodiment of the present application can be integral sheets, and the solution of the integral sheet can save processing technology costs and improve production efficiency.
  • the first sheet and the second sheet in the embodiment of the present application can also be two independent pieces, which can save processing steps and improve production efficiency from another aspect.
  • the first edge portion includes a first nylon layer, a first aluminum layer, and a first fused resin layer that are fixed to each other in sequence along the first direction
  • the second edge portion includes a second nylon layer, a second aluminum layer, and a second fused resin layer that are fixed to each other in sequence along the second direction, wherein the first direction and the second direction are arranged oppositely; the first edge portion and the second edge portion are fused via the first fused resin layer and the second fused resin layer to form the resin fusion zone; the test portion is constructed as a hole-shaped structure formed by high-temperature fusion of the preform in the resin fusion zone and the preform can be removed.
  • the resin fusion zone is a structural area where two pieces of aluminum-plastic films are fused at their respective edges, and the test portion is formed by the preform in the resin fusion zone through high-temperature fusion, and the preform is removed after solid-state molding, so that the resin fusion zone can form a hole-shaped structure that is compatible with the outer contour of the test portion.
  • the hole-shaped structure formed by fusion of the application preform in the embodiment of the present application can obtain a hole-shaped structure of a fixed shape after the resin fusion zone is cooled and solidified. It can be understood that the hole-shaped structure of the test part is obtained by the method of the embodiment of the present application, and the position of the hole-shaped structure can be set according to the actual verification needs.
  • the first edge portion is arranged on the first side wall of the first sheet layer
  • the second edge portion is arranged on the second side wall of the second sheet layer
  • the positions of the first side wall and the second side wall are arranged correspondingly
  • the hole-shaped structure is located in the resin fusion zone on the side where the first side wall and the second side wall are located.
  • the side wall of the embodiment of the present application can be understood as the side wall on any side of the circumference except the top wall.
  • the orientation of the first side wall is set to correspond to the orientation of the second side wall to obtain the resin fusion zone of the same side wall.
  • the hole-shaped structure can be located in the resin fusion zone on the side where the first side wall and the second side wall are located.
  • the hole-shaped structure can be any one of a circular hole, a square hole, an angular hole, a trapezoidal hole or an irregular hole.
  • the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure.
  • the hole-shaped structure can be hot-melt molded at the position of any side wall, which is used for the accuracy detection of the inspection equipment for detecting micropore defects at the side wall connection position.
  • the first edge portion is arranged on the first top wall of the first sheet layer
  • the second edge portion is arranged on the second top wall of the second sheet layer
  • the first top wall and the second top wall are arranged correspondingly
  • a tab resin layer is sandwiched between the first fusion resin layer and the second fusion resin layer, and the tab resin layer is configured to fix the tab between the first top wall and the second top wall
  • the resin fusion zone is located between the first fusion resin layer and the tab resin layer
  • the resin fusion zone is located between the second fusion resin layer and the tab resin layer.
  • the hole-shaped structure can be located between the first fusion resin layer and the tab resin layer on the side where the first top wall and the second top wall are located, and/or, the hole-shaped structure can be located between the second fusion resin layer and the tab resin layer on the side where the first top wall and the second top wall are located.
  • the embodiment of the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure.
  • the hole-shaped structure can be hot-melt-formed at the above-mentioned corresponding position of the top wall, and is used for accuracy detection of the verification equipment for detecting micropore defects at the connection position of the top wall.
  • the melting points of the first fusible resin layer and the second fusible resin layer are less than 300°C.
  • the melting point of the preform used in the embodiments of the present application is greater than 300°C, so that the resin fusion zone can achieve a process of melting, combining and then fixing below 300°C to further shape the hole-shaped structure.
  • the pore structure is configured as micropores.
  • the micropores in the embodiments of the present application are small pores less than 2 nanometers to accommodate the pore structure of the resin fusion zone on the corresponding side.
  • the micropores have a relatively small structural size to accommodate the structural setting of the soft-pack battery in the embodiments of the present application.
  • the inner wall of the micropore is included in the resin fusion zone, so that the size of the hot-melt-molded micropore does not exceed the range of the resin fusion zone, further ensuring that the shell structure of the embodiment of the present application can be used for the accuracy detection of micropore defect inspection equipment.
  • the inner radial size of the micropores ranges from 10um to 100um. It is further ensured that the size of the micropore structure does not exceed the range of the resin fusion zone, so that the shell structure of the embodiment of the present application can be used for accuracy detection of micropore defect inspection equipment.
  • the shell structure is configured to fill the internal cavity with helium during the hot melt forming process.
  • the battery formed in this solution can be applied to a helium leak detection system, and the battery can be flexibly prepared into a structure consistent with an online product and placed in the entire helium detection system for calibrating the entire leak detection system.
  • an embodiment of the present application provides a battery cell, which includes the shell structure, winding core and pole lug of any of the above embodiments, wherein the winding core is accommodated in the internal cavity, and the pole lug is clamped between the first edge portion and the second edge portion, and extends out of the first edge portion and the second edge portion.
  • an embodiment of the present application provides a battery, which includes a plurality of battery cells in the above embodiments, arranged side by side along a preset direction; wherein the preset direction is any direction.
  • an embodiment of the present application provides an electrical device, which includes the battery in the above embodiment.
  • the battery is used to provide electrical energy.
  • FIG1 is a schematic diagram of the structure of a vehicle in some embodiments of the present application.
  • FIG2 is an exploded schematic diagram of a battery in some embodiments of the present application.
  • FIG3 is a schematic diagram of the structure of a soft-pack battery cell in some embodiments of the present application.
  • FIG4 is a schematic diagram of a planar structure of a shell structure in a heat-sealed state in some embodiments of the present application.
  • FIG5 is a schematic diagram of the side wall structure layer of the shell structure along the direction A in FIG4 ;
  • FIG. 6 is a schematic diagram of a structural layer in which a pole ear is sandwiched on the top wall of the shell structure along the B direction shown in FIG. 4 .
  • the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • the helium inspection method is to evacuate the battery to be inspected and fill it with helium of a certain pressure. Due to the effect of micro-leakage defects, the accuracy of the helium inspection is judged by comparing the pressure value of the helium. Over-killing and excessive verification will cause batteries that meet production standards to fail quality inspection. Under-killing and failure to detect micro-leakage defects in the resin fusion area will cause soft-pack battery cells that do not meet the standards to pass quality inspection.
  • the entire inspection system includes battery cells used for testing, pipes used to connect the verification equipment, and verification equipment.
  • Soft-pack lithium-ion batteries are widely used as power and consumer lithium-ion batteries due to their advantages such as good safety, high specific energy, and long life.
  • soft-pack lithium-ion batteries if air and moisture from the outside of the battery enter the interior, it will react with the active chemical system inside, causing battery performance degradation and flatulence. Therefore, the sealing of soft-pack batteries is particularly important to battery life and safety. Based on this, in the production process of soft-pack batteries, it is also particularly important to check the air tightness of the battery.
  • common air tightness detection methods for soft-pack lithium batteries include negative pressure volume difference identification and pressure differential detection (hereinafter referred to as: negative pressure pressure differential method), helium detection method, etc.
  • negative pressure volume difference identification and pressure differential detection are through The pressure difference between the inside and outside of the battery is created to deform the aluminum-plastic film of the battery, and then the battery is judged to be leaking by visually observing the change in the battery shape or identifying the change in the coordinates of the laser marking line before and after the negative pressure is applied.
  • This detection method often relies on human subjective judgment or laser displacement detection sensitivity, and the detection results may still have the problem of missed detection.
  • a non-standard leakage block is usually used, and the accuracy of the equipment currently used for verification without a standard leakage block often causes over-killing or missed killing, resulting in detection failure.
  • helium detection is a means of inspection.
  • helium with a certain pressure is filled.
  • the outside of the battery to be inspected is a vacuum box with a certain vacuum requirement, and the vacuum box is connected to the leak detection port of the helium mass spectrometer leak detector.
  • the helium detection method usually connects the standard leakage block directly to the helium detector through a pipeline for verification. This method can only detect the reliability of the helium detection instrument alone, and cannot verify the accuracy of the entire detection system.
  • the existing method for detecting leaking batteries is to use copper wire to punch holes in the aluminum-plastic film. Since the aluminum-plastic film has metallic ductility, the aperture structure and size formed by mechanical stress punching are often inconsistent, and holes can only be made on the aluminum-plastic film of the battery body.
  • the hole length is consistent with the thickness of the aluminum-plastic film, about 80um-160um.
  • the soft-pack battery adopts a heat sealing process, and the actual leakage points of the battery are mostly micropores in the heat-sealed area.
  • the length of the micropores is consistent with the width of the heat-sealed area, about 40mm-100mm, rather than 80um-160um in the prior art.
  • the amount of gas leakage is proportional to the square root of the hole length.
  • the detection method in the prior art can only detect gas leakage when the amount of gas leakage is about 30 times that of the actual battery, and cannot effectively verify and detect micro-leakage defects in the heat-sealed area of the actual battery.
  • the inventor of the present application has designed a soft-pack battery shell structure after in-depth research.
  • the test part can be connected between the outside and the inner cavity of the battery, so that the soft-pack battery can detect micro-leakage defects with a resin fusion area when performing a negative pressure differential pressure method or a helium detection method, thereby improving the detection accuracy of the negative pressure differential pressure method and the helium detection method, and further reducing or avoiding the phenomenon of over-killing or under-killing.
  • the internal cavity between the winding core and the shell structure is inflated and pressurized. Since the test part can connect the outside world with the internal cavity, a part of the quantitative gas inflated and pressurized will be released from the internal cavity to the outside world, so that when the inflated and pressurized gas is extracted and measured, the overall gas pressure is reduced, so that the air tightness of the battery cell with micro-leakage defects located in the resin fusion area can be detected.
  • the helium detection method is used to detect the air tightness of the battery cell, the battery under test is evacuated and filled with helium of a certain pressure.
  • the outside of the battery under test is a vacuum box with a certain vacuum requirement, and the vacuum box is connected to the leak detection port of the helium mass spectrometer leak detector. Since the test part can connect the outside world with the internal cavity, a part of the helium of a certain pressure filled will be released from the internal cavity to the outside world, so that the pressure of the quantitative helium is reduced, so that the air tightness of the battery cell with micro-leakage defects located in the resin fusion area can be detected.
  • the shell structure disclosed in the embodiment of the present application can be a shell for detecting the air tightness of a battery cell.
  • the battery cell with a shell structure disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft.
  • a power system having a shell structure, a battery cell, a battery, etc. disclosed in the embodiment of the present application can be used to form the electrical device. System.
  • the embodiment of the present application provides an electric device using a battery as a power source
  • the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.
  • the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000.
  • the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10.
  • the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20.
  • the second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12.
  • the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
  • the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10.
  • the battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.
  • Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a
  • the battery cell 20 may be a cylindrical body, a flat body, a rectangular body or other shapes.
  • FIG 3 is a schematic diagram of the structure of a battery cell 20 in a soft-pack battery provided in some embodiments of the present application.
  • a battery cell 20 refers to the smallest unit that makes up a battery.
  • the battery cell 20 includes a shell structure and a tab 21a, wherein the shell structure includes a top wall 21 and side walls 22 that are surrounded by the top wall 21 to form a closed structure, and the tab 21a is arranged on the top wall 21.
  • the two layers at the edge are fixedly connected together, that is, the edges of the first layer 23 and the second layer 24 are fixedly connected.
  • the shell structure refers to a component that isolates the internal environment of the battery cell 20 from the external environment.
  • the present application does not limit the shape of the shell structure, as long as it can form a structure that is fixedly connected all around.
  • the top wall 21 is a side of the soft-pack battery where the tab 21a is provided.
  • the side wall 22 is the other side of the soft-pack battery except the side where the tab 21a is provided.
  • the sheet layer is a unit shell structure used to form a soft-pack battery shell structure, which can be understood as a film layer structure.
  • the internal environment formed by the shell structure in the soft-pack battery cell 20 can be used to accommodate the core, electrolyte and other components.
  • the core of the soft-pack battery and the cell assembly of the hard-shell battery carry similar functions, and are both components in the battery cell 20 where electrochemical reactions occur.
  • the shell structure of the present application may contain one or more cores.
  • the core is mainly formed by winding or stacking the positive and negative electrodes, and a diaphragm is usually provided between the positive and negative electrodes.
  • the parts of the positive and negative electrodes with active materials constitute the main body of the core, and the parts of the positive and negative electrodes without active materials each constitute the pole ear 21a.
  • the positive pole ear 21a and the negative pole ear 21a can be located together at one end of the main body or at both ends of the main body respectively.
  • the two pole ears 21a of the core in the present application are located together on the top wall 21 of the shell structure.
  • the present application provides a shell structure for a battery 100 or a battery cell 20.
  • the shell structure includes a first sheet 23, a second sheet 24 and a test part.
  • the first sheet 23 includes a first edge part 231 on the periphery.
  • the second sheet 24 is arranged opposite to the first sheet 23.
  • the second sheet 24 includes a second edge part 241 on the periphery.
  • the first edge part 231 and the second edge part 241 are fused to form a shell with an internal cavity.
  • the area where the first edge part 231 and the second edge part 241 are fused to each other is a resin fusion area 40.
  • the test part runs through the resin fusion area 40, connects the outside with the internal cavity, and is configured to allow the gas in the internal cavity to be released to the outside through the test part.
  • the first layer 23 and the second layer 24 of the embodiment of the present application can be understood as aluminum-plastic film, that is, the first layer 23 is a first aluminum-plastic film, and the second layer 24 is a second aluminum-plastic film.
  • the embodiment of the present application does not limit the structure, shape characteristics, etc. of the test part, as long as the connection between the internal cavity and the outside world can be achieved.
  • the first fusible resin layer 2313 and the second fusible resin layer 2413 of the embodiment of the present application can both adopt hot melt adhesive layers.
  • hot melt adhesive is a plastic adhesive that is solid at room temperature and can be quickly bonded after being heated and melted.
  • the test part in the embodiment of the present application is a structural feature for connecting the outside world and the internal cavity obtained by combining the characteristics of hot melt adhesive.
  • the test part can be formed during the shell structure molding process, the process is simple, the molding efficiency is high, and the operation is easy. And the structural size and direction setting of the test part of the embodiment of the present application are determined according to actual needs, as long as the connection between the outside and the internal cavity can be achieved.
  • Figure 4 is a plan view of the heat sealing process of the soft-pack battery, in which the periphery of the shell structure shown in the grid area is the heat sealing area, that is, the structure of the first edge portion 231 and the second edge portion 241 that are heat-fused into an integral edge.
  • a test part is formed by hot melting in the edge of the shell structure used to constitute the battery cell 20 or the battery, that is, in the resin fusion area 40 between the first edge portion 231 and the second edge portion 241, and the test part is used to achieve communication between the outside and the internal cavity of the shell structure, so that no matter whether the negative pressure differential method or the helium detection method is adopted, the internal cavity can be pressurized or filled with helium.
  • the gas pressurized or filled in the internal cavity will be released to the outside through the test part, and according to the change of the pressure or pressure value of the gas in the internal cavity, it is verified whether each verification device can detect the pressure difference change or the helium filling amount change caused by the existence of the test part, that is, the accuracy of the verification result of the corresponding verification device is verified.
  • the test portion is configured to be hot-melt molded along the width direction of the resin fusion zone 40.
  • This solution can be used to prepare a soft-pack battery heat-sealed zone with micropores whose length is consistent with the width of the heat-sealed zone (that is, the resin fusion zone 40) during the production process, accurately simulating the micropore defects in the heat-sealed zone of the battery, and improving the accuracy of the verification and detection system in detecting micro leaks.
  • the first sheet layer 23 and the second sheet layer 24 are integral sheets, and the integral sheets are formed by folding or bending to form the first sheet layer 23 and the second sheet layer 24 that are relatively arranged.
  • the first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application can be an integral sheet layer.
  • the use of the integral sheet layer solution can save processing technology costs and improve production efficiency.
  • the first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application can also be two independent sheets, which can save processing steps and improve production efficiency from another aspect.
  • first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application are integral sheets, and the first sheet layer 23 and the second sheet layer 24 are formed by bending or bending, the first sheet layer 23 and the second sheet layer 24 are still hot-melt fixedly connected at the first edge portion 231 and the second edge portion 241 of each periphery.
  • the process cost of the overall processing technology of the soft-pack battery can be saved, or some process steps can be reduced to further reduce the process cost.
  • the first direction may refer to the C1 direction in FIG5 , wherein the first direction is the thickness direction of the first sheet layer 23.
  • the second direction may refer to the C2 direction in FIG5 , wherein the second direction is the opposite direction to the first direction.
  • the preform 30 is a process component used to form the test part, and needs to be removed after the structure of the test part is formed.
  • the first edge portion 231 includes a first nylon layer 2311, a first aluminum layer 2312, and a first fused resin layer 2313 that are mutually covered and fixed in sequence along the first direction
  • the second edge portion 241 includes a second nylon layer 2411, a second aluminum layer 2412, and a second fused resin layer 2413 that are mutually covered and fixed in sequence along the second direction, wherein the first direction and the second direction are arranged oppositely; the first edge portion 231 and the second edge portion 241 are fused via the first fused resin layer 2313 and the second fused resin layer 2413 to form a resin fusion zone 40; the test portion is constructed by prefabricating The hole-shaped structure 31 formed by high-temperature fusion of the resin fusion zone 40 can remove the preform 30.
  • the aluminum-plastic film composed of the nylon layer, the aluminum layer and the fused resin layer has good flexibility, moisture-proof, oxygen-proof, light-shielding, shielding, anti-static, vacuum-drawable,
  • the resin fusion zone 40 is a structural area where two pieces of aluminum-plastic films are fused at their respective edges.
  • the test part is formed in the resin fusion zone 40 by high-temperature fusion of the preform 30, and the preform 30 is removed after solid-state molding, so that the resin fusion zone 40 can form a hole-shaped structure 31 that is adapted to the outer contour of the test part.
  • the hole-shaped structure 31 formed by the preform 30 of the embodiment of the present application can obtain a hole-shaped structure 31 of a fixed shape after the resin fusion zone 40 is hot-melted, molded, cooled and solidified.
  • the hole-shaped structure 31 of the test part is obtained by the method of the embodiment of the present application, and the position of the hole-shaped structure 31 can be set according to the needs of actual verification.
  • the structure and size of the preform 30 are compatible with the structure and size of the required test part, and this application does not limit this.
  • the preform 30 pre-placed in the resin fusion zone 40 can be made of metal.
  • the preform 30 is a metal wire, uniform pores can be formed through the resin fusion area 40 after being pulled out from the resin fusion area 40 according to the different diameters of the metal wire, so as to simulate different degrees of battery leakage rate and test the detection system's ability to detect different degrees of leakage.
  • the top wall 21, referring to FIG3, is a side edge of the soft-pack battery for arranging the pole ear 21a, which is the top wall 21 position of the shell structure.
  • the side wall 22, referring to FIG3, is a side wall 22 position of the shell structure except for the side edge of the soft-pack battery for arranging the pole ear 21a.
  • the top wall 21 and the side wall 22 can be formed by fusing two pieces of aluminum-plastic film.
  • the first edge portion 231 is arranged on the first side wall 22 of the first layer 23, the second edge portion 241 is arranged on the second side wall 22 of the second layer 24, and the positions of the first side wall 22 and the second side wall 22 are correspondingly arranged; the hole-shaped structure 31 is located in the resin fusion area 40 on the side where the first side wall 22 and the second side wall 22 are located.
  • the side wall 22 of the embodiment of the present application can be understood as the side wall 22 on any side of the circumferential side except the top wall 21.
  • the orientation of the first side wall 22 is set to correspond to the orientation of the second side wall 22 to obtain the resin fusion zone 40 of the same side wall 22.
  • the hole-shaped structure 31 can be located in the resin fusion zone 40 on the side where the first side wall 22 and the second side wall 22 are located.
  • the hole-shaped structure 31 can be any one of a circular hole, a square hole, an angular hole, a trapezoidal hole or an irregular hole.
  • the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure 31.
  • the hole-shaped structure 31 can be a structure with a uniform pore size throughout the heat-sealed area (resin fusion zone 40) of each side wall 22 or top wall 21 shown in Figure 4.
  • the hole-shaped structure 31 can be hot-melt formed along the width direction of the heat-sealing area (resin fusion area 40) so that the length of the micropores in the heat-sealing area of the prepared soft-pack battery is consistent with the width of the heat-sealing area during the production process, accurately simulating the micropore defects in the heat-sealing area of the battery, and improving the accuracy of the verification and detection system in detecting micro leaks.
  • the hole-shaped structure 31 can be hot-melt formed at the position of any side wall 22, and the accuracy detection of the verification equipment used to detect micropore defects at the connection position of the side wall 22 can be fully simulated.
  • the micropore defect area that appears in the heat sealing area of the battery can accurately test the reliability of the detection system in detecting micro-leakage defects.
  • the tab resin layer 21 b is a tab glue for sandwiching the tab 21 a within the resin fusion area 40 .
  • the material of the tab resin layer 21 b may be the same as that of the first fusion resin layer 2313 and the second fusion resin layer 2413 .
  • the first edge portion 231 is arranged on the first top wall 21 of the first layer 23, the second edge portion 241 is arranged on the second top wall 21 of the second layer 24, the first top wall 21 and the second top wall 21 are arranged correspondingly, and a pole ear resin layer 21b is sandwiched between the first fusion resin layer 2313 and the second fusion resin layer 2413, and the pole ear resin layer 21b is constructed to fix the pole ear 21a between the first top wall 21 and the second top wall 21; the resin fusion zone 40 is located between the first fusion resin layer 2313 and the pole ear resin layer 21b, and/or, the resin fusion zone 40 is located between the second fusion resin layer 2413 and the pole ear resin layer 21b.
  • the hole-shaped structure 31 can be located in the resin fusion area 40 on the side where the first top wall 21 and the second top wall 21 are located. Furthermore, the hole-shaped structure 31 can be located between the first fused resin layer 2313 and the tab resin layer 21b on the side where the first top wall 21 and the second top wall 21 are located, and/or, the hole-shaped structure 31 can be located between the second fused resin layer 2413 and the tab resin layer 21b on the side where the first top wall 21 and the second top wall 21 are located.
  • the embodiment of the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure 31.
  • the hole-shaped structure 31 can be hot-melt-formed at the above-mentioned corresponding position of the top wall 21, and can be used for accuracy detection of the calibration equipment for detecting micropore defects at the connection position of the top wall 21.
  • the melting points of the first fusible resin layer 2313 and the second fusible resin layer 2413 are less than 300°C.
  • the melting point of the preform 30 used in the embodiment of the present application is greater than 300°C, so that the resin fusion zone 40 can achieve a process of melting, combining and then fixing below 300°C to further form the hole-shaped structure 31.
  • the pore structure 31 is configured as a micropore.
  • the micropore of the present application is a small hole less than 2 nanometers to accommodate the pore structure 31 of the resin fusion zone 40 on the corresponding side.
  • the micropore has a relatively small structural size to accommodate the structural setting of the soft-pack battery in the embodiment of the present application.
  • the inner wall of the micropore is contained within the range of the resin fusion zone 40. So that the size of the hot-melt molding of the micropore will not exceed the range of the resin fusion zone 40, further ensuring that the shell structure of the embodiment of the present application can be used for the accuracy detection of the verification equipment of the micropore defects.
  • the micropore can be arranged at any position between the first hot-melt resin layer and the second hot-melt resin layer that can be hot-melt molded between two pieces of aluminum-plastic films.
  • Fig. 6 it is an enlarged structural schematic diagram of the resin fusion zone 40 of the pole ear clamped on the top wall along the B direction.
  • the micropore can be arranged at any position between the pole ear resin layer 21b and the first hot-melt resin layer, or the micropore can also be arranged at any position between the pole ear resin layer 21b and the second hot-melt resin layer.
  • the inner radial size of the micropores ranges from 10um to 100um. It is further ensured that the size of the micropore structure does not exceed the range of the resin fusion zone, so that the shell structure of the embodiment of the present application can be used for accuracy detection of micropore defect verification equipment.
  • helium can be injected into the shell structure during the heat sealing process to make the soft-pack battery It can be applied to helium leak detection system.
  • the battery can be flexibly prepared into a structure consistent with the online product and placed in the entire helium leak detection system to calibrate the entire leak detection system.
  • the process of the battery with micro-leakage defects in the embodiment of the present application is described.
  • a metal wire of a preset diameter is placed between the first aluminum-plastic film and the second aluminum-plastic film that need to be sealed at the edges with each other.
  • the preset diameter can be understood as corresponding to the size of the actual micro-leak hole to be detected.
  • the metal wire in the process is extracted.
  • an empty structure that is, a hole-shaped structure 31
  • a soft-pack battery with a microporous structure with uniform pore diameter running through the heat-sealed area is obtained, which is used as an airtight standard leakage block to verify the accuracy of the detection system.
  • the length of the micropores in the heat-sealed area of the prepared soft-pack battery is consistent with the width of the heat-sealed area during the production process.
  • the hole-making position can be flexibly placed at the seal of the heat-sealed area of the main body (any side wall 22 of the shell structure) and the pole ear 21a (the resin fusion area 40 where the pole ear 21a is clamped by the top wall 21 of the shell structure), fully simulating the micropore defect area appearing in the heat-sealed area of the battery, and accurately testing the reliability of the detection system in detecting micro-leakage defects.
  • the battery of the embodiment of the present application is injected with helium during heat sealing, and can also be used to detect the reliability of the helium leak detection system.
  • the battery can be flexibly prepared into a structure consistent with the online product and placed in the entire helium detection system for calibrating the entire leak detection system, rather than just calibrating the helium detector.
  • the embodiment of the present application further provides a battery cell 20, which includes the shell structure, winding core and pole lug 21a in any of the above embodiments, the winding core is accommodated in the internal cavity, and the pole lug 21a is sandwiched between the first edge portion 231 and the second edge portion 241, and extends from the first edge portion 231 and the second edge portion 241.
  • the present application also provides a battery, which includes a plurality of battery cells 20 in the above embodiment, arranged side by side along a preset direction; wherein the preset direction is any direction.
  • a battery which includes a plurality of battery cells 20 in the above embodiment, arranged side by side along a preset direction; wherein the preset direction is any direction.
  • the present application further provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.
  • an electrical device which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present application relates to a shell structure, a battery cell (20), a battery (100), and an electric device. The shell structure comprises: a first sheet layer (23), wherein the peripheral side of the first sheet layer comprises a first edge portion (231); a second sheet layer (24) arranged opposite the first sheet layer (23), wherein the peripheral side of the second sheet layer (24) comprises a second edge portion (241), the first edge portion (231) and the second edge portion (241) are fused to form a shell in which an internal cavity is formed, and an area where the first edge portion (231) and the second edge portion (241) are fused to each other is a resin fusion area (40); and a test portion which penetrates the resin fusion area (40), is in communication with the outside and the internal cavity, and is configured to allow air in the internal cavity to be released to the outside via the test portion (40).

Description

壳结构、电池单体、电池及用电装置Shell structure, battery cell, battery and electrical device
交叉引用cross reference
本申请引用于2022年10月10日递交的名称为“壳结构、电池单体、电池及用电装置”的第2022112312278号中国专利申请，其通过引用被全部并入本申请。This application refers to Chinese Patent Application No. 2022112312278 filed on October 10, 2022, entitled “Shell structure, battery cell, battery and electrical device”, which is incorporated into this application in its entirety by reference.
技术领域Technical Field
本申请涉及电池制造技术领域，特别是涉及一种壳结构、电池单体、电池及用电装置。The present application relates to the technical field of battery manufacturing, and in particular to a shell structure, a battery cell, a battery and an electrical device.
背景技术Background technique
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.
在电池技术的发展中，除了提高电池的性能外，安全问题也是一个不可忽视的问题，如何提高电池的安全性，增强电池安全性能的质量校验仍然是电池技术中一个亟待解决的技术问题。In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. How to improve battery safety and enhance the quality verification of battery safety performance remains a technical problem that needs to be solved urgently in battery technology.
发明内容Summary of the invention
鉴于上述问题，本申请提供一种壳结构、电池单体、电池及用电装置，旨在提高校验设备的准确性。In view of the above problems, the present application provides a shell structure, a battery cell, a battery and an electrical device, aiming to improve the accuracy of the calibration equipment.
第一方面，本申请实施例提供了一种壳结构，用于电池或电池单体，壳结构包括第一片层、第二片层和测试部，所述第一片层的周侧包括第一边缘部，第二片层与所述第一片层相对设置，所述第二片层的周侧包括第二边缘部，所述第一边缘部与所述第二边缘部熔合形成内部空腔的壳体，所述第一边缘部与所述第二边缘部之间相互熔合的区域为树脂融合区；测试部贯穿所述树脂融合区，连通外界与所述内部空腔，并被构造为允许所述内部空腔的气体经由所述测试部释放至外界。In the first aspect, an embodiment of the present application provides a shell structure for a battery or a battery cell, the shell structure comprising a first sheet layer, a second sheet layer and a testing part, the first sheet layer comprising a first edge portion on the peripheral side, the second sheet layer being arranged opposite to the first sheet layer, the second sheet layer comprising a second edge portion on the peripheral side, the first edge portion and the second edge portion being fused to form a shell with an internal cavity, the area where the first edge portion and the second edge portion are fused to each other is a resin fusion area; the testing part passes through the resin fusion area, connecting the outside with the internal cavity, and is constructed to allow the gas in the internal cavity to be released to the outside through the testing part.
示例性的，本申请实施例的第一片层和第二片层均可以理解为是铝塑膜，即，第一片层为第一铝塑膜，第二片层为第二铝塑膜。示例性的，本方案对测试部的构造、形状、尺寸等特征不做限定，只要能够实现内部空腔与外界的连通即可。示例性的，本申请实施例的第一熔合树脂层和第二熔合树脂层均可以采用热熔胶层。Exemplarily, the first sheet layer and the second sheet layer of the embodiment of the present application can be understood as aluminum-plastic film, that is, the first sheet layer is a first aluminum-plastic film, and the second sheet layer is a second aluminum-plastic film. Exemplarily, this solution does not limit the structure, shape, size and other features of the test part, as long as the internal cavity can be connected to the outside. Exemplarily, the first fusible resin layer and the second fusible resin layer of the embodiment of the present application can both adopt hot melt adhesive layer.
本申请实施例的技术方案中，在用于组成电池单体或电池的壳结构的边缘，也就是第一边缘部与第二边缘部之间的树脂融合区内通过热熔的方式成型出测试部，通过该 测试部实现外界与壳结构内部空腔之间的连通，使得不管是采用压差法还是氦检法，能够通过向内部空腔加压或填充氦气的方式，在测试部的预设下，校验各校验设备是否能够检测出由于该测试部的存在导致的压差变化或氦气填充量的变化，即校验出相应校验设备校验结果的准确性。In the technical solution of the embodiment of the present application, a test portion is formed by hot melting in the edge of the shell structure used to form a battery cell or a battery, that is, in the resin fusion area between the first edge portion and the second edge portion. The test section realizes the communication between the outside world and the internal cavity of the shell structure, so that no matter whether the pressure difference method or the helium detection method is adopted, by pressurizing or filling the internal cavity with helium, under the preset of the test section, it is possible to verify whether each verification device can detect the pressure difference change or the change of helium filling amount caused by the existence of the test section, that is, to verify the accuracy of the verification result of the corresponding verification device.
在一些实施例中，测试部被构造为沿树脂融合区的宽度方向热熔成型。采用本方案能够制备出软包电池热封区带有的微孔长度与生产过程中热封区(也就是树脂融合区)宽度一致，准确模拟电池热封区出现的微孔缺陷，提高校验检测检测***检出微型漏孔的准确性。In some embodiments, the test part is configured to be hot-melt molded along the width direction of the resin fusion zone. This solution can produce a soft-pack battery heat-sealed zone with micropores of the same length as the width of the heat-sealed zone (i.e., the resin fusion zone) during the production process, accurately simulate the micropore defects in the heat-sealed zone of the battery, and improve the accuracy of the verification and detection system in detecting micro leaks.
在一些实施例中，所述第一片层与所述第二片层为整体片层，所述整体片层经由折叠或弯曲形成相对设置的所述第一片层和所述第二片层。示例性的，本申请实施例中的第一片层和第二片层可以为整体片层，采用整体片层的方案，能够节省加工工艺成本，提高生产效率。示例性的，本申请实施例中的第一片层和第二片层也可以为相互独立的两片结构，能够节省加工工序，从另一方面提高生产效率。In some embodiments, the first sheet and the second sheet are integral sheets, and the integral sheet is folded or bent to form the first sheet and the second sheet that are relatively arranged. Exemplarily, the first sheet and the second sheet in the embodiment of the present application can be integral sheets, and the solution of the integral sheet can save processing technology costs and improve production efficiency. Exemplarily, the first sheet and the second sheet in the embodiment of the present application can also be two independent pieces, which can save processing steps and improve production efficiency from another aspect.
在一些实施例中，所述第一边缘部沿第一方向依次包括相互覆盖固定的第一尼龙层、第一铝层和第一熔合树脂层，所述第二边缘部沿第二方向依次包括相互覆盖固定的第二尼龙层、第二铝层和第二熔合树脂层，其中，所述第一方向和所述第二方向相反设置；所述第一边缘部和所述第二边缘部经由所述第一熔合树脂层、所述第二熔合树脂层熔合形成所述树脂融合区；所述测试部被构造为由预制件在所述树脂融合区高温熔合形成的孔形结构并能够将所述预制件移出。示例性的，树脂融合区为两片铝塑膜在各自边缘熔合成型的结构区域，测试部是由预制件通过高温熔合在该树脂融合区成型，并在固态成型后将预制件移出，以使树脂融合区能够成型出与测试部外廓相适应的孔形结构。采用本申请实施例的应用预制件熔合成型的孔形结构，在树脂融合区冷却凝固后，能够得到固定形态的孔形结构，可以理解为，采用本申请实施例的方式得到该测试部的孔形结构，可以根据实际校验的需要而设定该孔形结构的位置。In some embodiments, the first edge portion includes a first nylon layer, a first aluminum layer, and a first fused resin layer that are fixed to each other in sequence along the first direction, and the second edge portion includes a second nylon layer, a second aluminum layer, and a second fused resin layer that are fixed to each other in sequence along the second direction, wherein the first direction and the second direction are arranged oppositely; the first edge portion and the second edge portion are fused via the first fused resin layer and the second fused resin layer to form the resin fusion zone; the test portion is constructed as a hole-shaped structure formed by high-temperature fusion of the preform in the resin fusion zone and the preform can be removed. Exemplarily, the resin fusion zone is a structural area where two pieces of aluminum-plastic films are fused at their respective edges, and the test portion is formed by the preform in the resin fusion zone through high-temperature fusion, and the preform is removed after solid-state molding, so that the resin fusion zone can form a hole-shaped structure that is compatible with the outer contour of the test portion. The hole-shaped structure formed by fusion of the application preform in the embodiment of the present application can obtain a hole-shaped structure of a fixed shape after the resin fusion zone is cooled and solidified. It can be understood that the hole-shaped structure of the test part is obtained by the method of the embodiment of the present application, and the position of the hole-shaped structure can be set according to the actual verification needs.
在一些实施例中，所述第一边缘部布置于所述第一片层的第一侧壁，所述第二边缘部布置于所述第二片层的第二侧壁，所述第一侧壁与所述第二侧壁的位置对应设置；所述孔形结构位于所述第一侧壁、所述第二侧壁所在侧的所述树脂融合区内。示例性的，本申请实施例的侧壁可以理解为除顶壁以外的周侧任一侧的侧壁。示例性的，将第一侧壁设置的方位与第二侧壁的方位对应以得到同一侧壁的树脂融合区。该孔形结构可以位于与第一侧壁、第二侧壁所在侧的树脂融合区内。且，示例性的，孔形结构可以为圆孔、方孔、角形孔、梯形孔或者不规则孔中的任意一种。示例性的，本申请对该孔形结构的结构、形状、孔深及开孔方向等不做限定。采用本方案的壳结构，能够将该孔形结构热熔成型于任一侧壁的位置，用于检测侧壁连接位置的微孔缺陷的校验设备的准确性检测。 In some embodiments, the first edge portion is arranged on the first side wall of the first sheet layer, the second edge portion is arranged on the second side wall of the second sheet layer, and the positions of the first side wall and the second side wall are arranged correspondingly; the hole-shaped structure is located in the resin fusion zone on the side where the first side wall and the second side wall are located. Exemplarily, the side wall of the embodiment of the present application can be understood as the side wall on any side of the circumference except the top wall. Exemplarily, the orientation of the first side wall is set to correspond to the orientation of the second side wall to obtain the resin fusion zone of the same side wall. The hole-shaped structure can be located in the resin fusion zone on the side where the first side wall and the second side wall are located. And, exemplarily, the hole-shaped structure can be any one of a circular hole, a square hole, an angular hole, a trapezoidal hole or an irregular hole. Exemplarily, the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure. Using the shell structure of this scheme, the hole-shaped structure can be hot-melt molded at the position of any side wall, which is used for the accuracy detection of the inspection equipment for detecting micropore defects at the side wall connection position.
在一些实施例中，所述第一边缘部布置于所述第一片层的第一顶壁，所述第二边缘部布置于所述第二片层的第二顶壁，所述第一顶壁与所述第二顶壁对应设置，所述第一熔合树脂层与所述第二熔合树脂层之间夹设有极耳树脂层，所述极耳树脂层被构造于将极耳固定于所述第一顶壁与所述第二顶壁之间；所述树脂融合区位于所述第一熔合树脂层与所述极耳树脂层之间，和/或，所述树脂融合区位于所述第二熔合树脂层与所述极耳树脂层之间。采用本申请实施例的壳结构，该孔形结构可以位于第一顶壁、第二顶壁所在侧的树脂融合区内。且进一步的，该孔形结构可以位于第一顶壁、第二顶壁所在侧的第一熔合树脂层与极耳树脂层之间，和/或，该孔形结构可以位于第一顶壁、第二顶壁所在侧的第二熔合树脂层与极耳树脂层之间。示例性的，本申请实施例对该孔形结构的结构、形状、孔深及开孔方向等不做限定。采用本申请实施例的壳结构，能够将该孔形结构热熔成型于顶壁的上述相应位置，用于检测顶壁连接位置的微孔缺陷的校验设备的准确性检测。In some embodiments, the first edge portion is arranged on the first top wall of the first sheet layer, the second edge portion is arranged on the second top wall of the second sheet layer, the first top wall and the second top wall are arranged correspondingly, a tab resin layer is sandwiched between the first fusion resin layer and the second fusion resin layer, and the tab resin layer is configured to fix the tab between the first top wall and the second top wall; the resin fusion zone is located between the first fusion resin layer and the tab resin layer, and/or, the resin fusion zone is located between the second fusion resin layer and the tab resin layer. Using the shell structure of the embodiment of the present application, the hole-shaped structure can be located in the resin fusion zone on the side where the first top wall and the second top wall are located. And further, the hole-shaped structure can be located between the first fusion resin layer and the tab resin layer on the side where the first top wall and the second top wall are located, and/or, the hole-shaped structure can be located between the second fusion resin layer and the tab resin layer on the side where the first top wall and the second top wall are located. Exemplarily, the embodiment of the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure. By adopting the shell structure of the embodiment of the present application, the hole-shaped structure can be hot-melt-formed at the above-mentioned corresponding position of the top wall, and is used for accuracy detection of the verification equipment for detecting micropore defects at the connection position of the top wall.
在一些实施例中，所述第一熔合树脂层和所述第二熔合树脂层的熔点小于300℃，示例性的，本申请实施例中所应用的预制件的熔点大于300℃，以使树脂融合区能够在300℃以下实现融化结合再固定的过程，以进一步成型出该孔形结构。In some embodiments, the melting points of the first fusible resin layer and the second fusible resin layer are less than 300°C. Exemplarily, the melting point of the preform used in the embodiments of the present application is greater than 300°C, so that the resin fusion zone can achieve a process of melting, combining and then fixing below 300°C to further shape the hole-shaped structure.
在一些实施例中，所述孔形结构构造为微孔。示例性的，本申请实施例的微孔为小于2纳米的小孔，以适应相应侧的树脂融合区的孔形结构。微孔的结构尺寸较小，以适应本申请实施例中的软包电池的结构设定。In some embodiments, the pore structure is configured as micropores. Exemplarily, the micropores in the embodiments of the present application are small pores less than 2 nanometers to accommodate the pore structure of the resin fusion zone on the corresponding side. The micropores have a relatively small structural size to accommodate the structural setting of the soft-pack battery in the embodiments of the present application.
在一些实施例中，所述微孔的内壁包含在所述树脂融合区范围内。以使微孔的热熔成型的尺寸不会超出树脂融合区的范围，进一步确保本申请实施例的壳结构能够用于微孔缺陷的校验设备的准确性检测。In some embodiments, the inner wall of the micropore is included in the resin fusion zone, so that the size of the hot-melt-molded micropore does not exceed the range of the resin fusion zone, further ensuring that the shell structure of the embodiment of the present application can be used for the accuracy detection of micropore defect inspection equipment.
在一些实施例中，所述微孔的内廓径向尺寸范围为10um—100um。进一步确保微孔结构尺寸不会超出树脂融合区的范围，以使本申请实施例的壳结构能够用于微孔缺陷的校验设备的准确性检测。In some embodiments, the inner radial size of the micropores ranges from 10um to 100um. It is further ensured that the size of the micropore structure does not exceed the range of the resin fusion zone, so that the shell structure of the embodiment of the present application can be used for accuracy detection of micropore defect inspection equipment.
在一些实施例中，所述壳结构被构造为在热熔成型过程中向所述内部空腔填充氦气。能够将本方案成型后的电池应用于氦检泄漏检测***，电池可以灵活制备成与在线产品一致的结构，放置于整个氦检***中用于对整个检漏***进行校验。In some embodiments, the shell structure is configured to fill the internal cavity with helium during the hot melt forming process. The battery formed in this solution can be applied to a helium leak detection system, and the battery can be flexibly prepared into a structure consistent with an online product and placed in the entire helium detection system for calibrating the entire leak detection system.
第二方面，本申请实施例提供了一种电池单体，其包括上述任一实施例中的壳结构、卷芯和极耳，所述卷芯容纳于所述内部空腔内，所述极耳夹设于所述第一边缘部与所述第二边缘部之间，且伸出于所述第一边缘部和所述第二边缘部。In a second aspect, an embodiment of the present application provides a battery cell, which includes the shell structure, winding core and pole lug of any of the above embodiments, wherein the winding core is accommodated in the internal cavity, and the pole lug is clamped between the first edge portion and the second edge portion, and extends out of the first edge portion and the second edge portion.
第三方面，本申请实施例提供了一种电池，其包括多个上述实施例中的电池单体，沿预设方向并排设置；其中，所述预设方向为任意一个方向。In a third aspect, an embodiment of the present application provides a battery, which includes a plurality of battery cells in the above embodiments, arranged side by side along a preset direction; wherein the preset direction is any direction.
第四方面，本申请实施例提供了一种用电装置，其包括上述实施例中的电池，所 述电池用于提供电能。In a fourth aspect, an embodiment of the present application provides an electrical device, which includes the battery in the above embodiment. The battery is used to provide electrical energy.
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
通过阅读对下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在全部附图中，用相同的附图标号表示相同的部件。在附图中：Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
图1为本申请一些实施例中车辆的结构示意图；FIG1 is a schematic diagram of the structure of a vehicle in some embodiments of the present application;
图2为本申请一些实施例中电池的分解示意图；FIG2 is an exploded schematic diagram of a battery in some embodiments of the present application;
图3为本申请一些实施例中软包电池单体的结构示意图；FIG3 is a schematic diagram of the structure of a soft-pack battery cell in some embodiments of the present application;
图4为本申请一些实施例中壳结构的热封状态下的平面结构示意图；FIG4 is a schematic diagram of a planar structure of a shell structure in a heat-sealed state in some embodiments of the present application;
图5为沿图4中A向的壳结构的侧壁结构层示意图；FIG5 is a schematic diagram of the side wall structure layer of the shell structure along the direction A in FIG4 ;
图6为图4所示的沿B向壳结构的顶壁上夹设有极耳的结构层示意图。FIG. 6 is a schematic diagram of a structural layer in which a pole ear is sandwiched on the top wall of the shell structure along the B direction shown in FIG. 4 .
具体实施方式中的附图标号如下：The reference numerals in the specific implementation manner are as follows:
1000、车辆；100、电池；200、控制器；300、马达；10、箱体；11、第一部分；12、第二部分；20、电池单体；21、顶壁；21a、极耳；21b、极耳树脂层；22、侧壁；23、第一片层；24、第二片层；30、预制件；31、孔形结构；40、树脂融合区；231、第一边缘部；2311、第一尼龙层；2312、第一铝层；2313、第一熔合树脂层；241、第二边缘部；2411、第二尼龙层；2412、第二铝层；2413、第二熔合树脂层。1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, top wall; 21a, tab; 21b, tab resin layer; 22, side wall; 23, first sheet layer; 24, second sheet layer; 30, preform; 31, hole-shaped structure; 40, resin fusion zone; 231, first edge portion; 2311, first nylon layer; 2312, first aluminum layer; 2313, first fused resin layer; 241, second edge portion; 2411, second nylon layer; 2412, second aluminum layer; 2413, second fused resin layer.
具体实施方式Detailed ways
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体 的限定。In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly specified. limitation.
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship.
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
在本申请实施例的描述中，技术术语“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”“轴向”“径向”“周向”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实施例和简化描述，而不是指示或暗示所指的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实施例的限制。In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
无标准泄漏块，用于预设微漏缺陷的作为检验试验的软包电池单体。氦检法，对被检电池抽空后充入一定压强的氦气，由于微漏缺陷的作用，对比氦气的压强值判断氦检的准确性。过杀，过度校验，导致符合生产标准的电池没有通过质检。漏杀，无法检验出在树脂融合区的微漏缺陷，导致不符合标准的软包电池单体通过质检。整个检测***，包括用于试验的电池单体、用于连接校验设备的管子以及校验设备。There is no standard leakage block, which is used for soft-pack battery cells with preset micro-leakage defects as the inspection test. The helium inspection method is to evacuate the battery to be inspected and fill it with helium of a certain pressure. Due to the effect of micro-leakage defects, the accuracy of the helium inspection is judged by comparing the pressure value of the helium. Over-killing and excessive verification will cause batteries that meet production standards to fail quality inspection. Under-killing and failure to detect micro-leakage defects in the resin fusion area will cause soft-pack battery cells that do not meet the standards to pass quality inspection. The entire inspection system includes battery cells used for testing, pipes used to connect the verification equipment, and verification equipment.
软包锂离子电池因具备安全性好、比能量高、寿命长等优点，其作为动力及消费类锂离子电池被广泛应用。在软包锂离子电池的应用过程中，如果电池外部空气水分进入内部，会与内部活泼的化学体系反应，引起电池性能退化及胀气，因此软包电池密封性对电池寿命及安全尤为重要。基于此，在软包电池生产工艺过程中，针对电池气密性的检查也尤为重要。目前常见软包锂电池的气密性检测方法包括负压体积差异识别及压差检测(以下简称：负压压差法)、氦检法等。其中，负压体积差异识别及压差检测是通 过制造电池内外部压差使电池铝塑膜发生形变，进而通过目视电池形态变化或识别激光标线在施加负压前后的坐标变化判定电池是否泄漏，这种检测的方法往往依靠人为主观判定或激光位移检测灵敏度，检测结果还是会有漏检的问题。为了对上述检测设备的检测准确性进行校验，通常会应用无标准泄漏块，且目前无标准泄漏块用于校验的设备的准确性往往造成过杀或漏杀导致检测失效。另外，氦检是一种检验手段，对被检电池抽空后充入一定压强的氦气，被检电池外面是具有一定真空度要求的真空箱，真空箱与氦质谱检漏仪检漏口相接。而氦检法通常将标准泄漏块通过管道直接连接氦检仪进行校验，这种方法仅能单独检测氦检仪器的可靠性，无法对整个检测***的准确性进行校验。Soft-pack lithium-ion batteries are widely used as power and consumer lithium-ion batteries due to their advantages such as good safety, high specific energy, and long life. During the application of soft-pack lithium-ion batteries, if air and moisture from the outside of the battery enter the interior, it will react with the active chemical system inside, causing battery performance degradation and flatulence. Therefore, the sealing of soft-pack batteries is particularly important to battery life and safety. Based on this, in the production process of soft-pack batteries, it is also particularly important to check the air tightness of the battery. Currently, common air tightness detection methods for soft-pack lithium batteries include negative pressure volume difference identification and pressure differential detection (hereinafter referred to as: negative pressure pressure differential method), helium detection method, etc. Among them, negative pressure volume difference identification and pressure differential detection are through The pressure difference between the inside and outside of the battery is created to deform the aluminum-plastic film of the battery, and then the battery is judged to be leaking by visually observing the change in the battery shape or identifying the change in the coordinates of the laser marking line before and after the negative pressure is applied. This detection method often relies on human subjective judgment or laser displacement detection sensitivity, and the detection results may still have the problem of missed detection. In order to verify the detection accuracy of the above-mentioned detection equipment, a non-standard leakage block is usually used, and the accuracy of the equipment currently used for verification without a standard leakage block often causes over-killing or missed killing, resulting in detection failure. In addition, helium detection is a means of inspection. After the battery to be inspected is evacuated, helium with a certain pressure is filled. The outside of the battery to be inspected is a vacuum box with a certain vacuum requirement, and the vacuum box is connected to the leak detection port of the helium mass spectrometer leak detector. The helium detection method usually connects the standard leakage block directly to the helium detector through a pipeline for verification. This method can only detect the reliability of the helium detection instrument alone, and cannot verify the accuracy of the entire detection system.
现有用于检测泄漏件电池的方法为使用铜丝在铝塑膜上扎孔，由于铝塑膜具有金属延展性，机械应力扎孔形成的孔径结构及尺寸往往具有一致性不足，且仅能造孔于电池主体铝塑膜上，造孔长度与铝塑膜厚度一致约为80um—160um，而软包电池采用热封工艺，电池的真实的泄漏点多为热封区内的微孔，微孔长度与热封区宽度一致约为40mm—100mm，而非现有技术中的80um—160um，相同条件下等量的气体泄漏量与孔长的平方根成正比，现有技术中的检测方法气体泄漏量约为实际电池的30倍时才能检出，不能有效校验检测实际电池热封区微漏缺陷。The existing method for detecting leaking batteries is to use copper wire to punch holes in the aluminum-plastic film. Since the aluminum-plastic film has metallic ductility, the aperture structure and size formed by mechanical stress punching are often inconsistent, and holes can only be made on the aluminum-plastic film of the battery body. The hole length is consistent with the thickness of the aluminum-plastic film, about 80um-160um. The soft-pack battery adopts a heat sealing process, and the actual leakage points of the battery are mostly micropores in the heat-sealed area. The length of the micropores is consistent with the width of the heat-sealed area, about 40mm-100mm, rather than 80um-160um in the prior art. Under the same conditions, the amount of gas leakage is proportional to the square root of the hole length. The detection method in the prior art can only detect gas leakage when the amount of gas leakage is about 30 times that of the actual battery, and cannot effectively verify and detect micro-leakage defects in the heat-sealed area of the actual battery.
基于以上考虑，为了确保校验设备校验气密性的准确性，本申请发明人经过深入研究，设计了一种软包电池壳结构，通过在原有软包电池壳中两片铝塑膜之间连接的位置区域，也就是树脂融合区内设置测试部，使得测试部能够连通外界与电池内腔之间，以使软包电池在进行负压压差法或氦检法时，能够对具有树脂融合区的微漏缺陷进行检测，从而提升负压压差法以及氦检法的检测准确性，进一步减少或避免过杀或漏杀的现象。Based on the above considerations, in order to ensure the accuracy of the airtightness verification of the verification equipment, the inventor of the present application has designed a soft-pack battery shell structure after in-depth research. By setting a test part in the position area where the two aluminum-plastic films in the original soft-pack battery shell are connected, that is, in the resin fusion area, the test part can be connected between the outside and the inner cavity of the battery, so that the soft-pack battery can detect micro-leakage defects with a resin fusion area when performing a negative pressure differential pressure method or a helium detection method, thereby improving the detection accuracy of the negative pressure differential pressure method and the helium detection method, and further reducing or avoiding the phenomenon of over-killing or under-killing.
在具有这样的壳结构的电池单体中，当采用负压压差法检测电池单体的气密性时，对卷芯和壳结构之间的内部空腔进行充气加压，由于该测试部能够连通外界与内部空腔，进而使得充气加压的定量气体会有一部分由内部空腔释放至外界，使得再对该充气加压的气体抽出进行测量时，整体气体压强降低，从而能够检测出位于树脂融合区的微漏缺陷的电池单体的气密性。当采用氦检法检测电池单体的气密性时，对被检电池抽空后充入一定压强的氦气，被检电池外面是具有一定真空度要求的真空箱，真空箱与氦质谱检漏仪检漏口相接。由于该测试部能够连通外界与内部空腔，进而使得充入的一定压强的氦气会有一部分由内部空腔释放至外界，使得定量的氦气的压强降低，从而能够检测出位于树脂融合区的微漏缺陷的电池单体的气密性。In a battery cell with such a shell structure, when the negative pressure differential method is used to detect the air tightness of the battery cell, the internal cavity between the winding core and the shell structure is inflated and pressurized. Since the test part can connect the outside world with the internal cavity, a part of the quantitative gas inflated and pressurized will be released from the internal cavity to the outside world, so that when the inflated and pressurized gas is extracted and measured, the overall gas pressure is reduced, so that the air tightness of the battery cell with micro-leakage defects located in the resin fusion area can be detected. When the helium detection method is used to detect the air tightness of the battery cell, the battery under test is evacuated and filled with helium of a certain pressure. The outside of the battery under test is a vacuum box with a certain vacuum requirement, and the vacuum box is connected to the leak detection port of the helium mass spectrometer leak detector. Since the test part can connect the outside world with the internal cavity, a part of the helium of a certain pressure filled will be released from the internal cavity to the outside world, so that the pressure of the quantitative helium is reduced, so that the air tightness of the battery cell with micro-leakage defects located in the resin fusion area can be detected.
本申请实施例公开的壳结构，可以为用于检测电池单体气密性的壳体。本申请实施例公开的带有壳结构的电池单体可以但不限用于车辆、船舶或飞行器等用电装置中。可以使用具备本申请实施例公开的壳结构、电池单体、电池等组成该用电装置的电源系 统。The shell structure disclosed in the embodiment of the present application can be a shell for detecting the air tightness of a battery cell. The battery cell with a shell structure disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. A power system having a shell structure, a battery cell, a battery, etc. disclosed in the embodiment of the present application can be used to form the electrical device. System.
本申请实施例提供一种使用电池作为电源的用电装置，用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
以下实施例为了方便说明，以本申请一实施例的一种用电装置为车辆1000为例进行说明。For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
请参照图2，图2为本申请一些实施例提供的电池100的***图。电池100包括箱体10和电池单体20，电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，第一部分11和第二部分12共同限定出用于容纳电池单体20的容纳空间。第二部分12可以为一端开口的空心结构，第一部分11可以为板状结构，第一部分11盖合于第二部分12的开口侧，以使第一部分11与第二部分12共同限定出容纳空间；第一部分11和第二部分12也可以是均为一侧开口的空心结构，第一部分11的开口侧盖合于第二部分12的开口侧。当然，第一部分11和第二部分12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。Please refer to FIG. 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.
在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.
其中，每个电池单体20可以为二次电池或一次电池；还可以是锂硫电池、钠离 子电池或镁离子电池，但不局限于此。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a The battery cell 20 may be a cylindrical body, a flat body, a rectangular body or other shapes.
请参照图3，图3为本申请一些实施例提供的软包电池中电池单体20的结构示意图。电池单体20是指组成电池的最小单元。如图3，电池单体20包括有壳结构和极耳21a，其中，壳结构包括顶壁21和与顶壁21围设成封闭结构的各侧壁22，极耳21a布设于顶壁21上，由图中A方向看向壳结构的侧壁22，可以看到边缘处的两个片层固定连接在一起，即第一片层23与第二片层24的边缘固定连接。Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 20 in a soft-pack battery provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that makes up a battery. As shown in Figure 3, the battery cell 20 includes a shell structure and a tab 21a, wherein the shell structure includes a top wall 21 and side walls 22 that are surrounded by the top wall 21 to form a closed structure, and the tab 21a is arranged on the top wall 21. Looking from the direction A in the figure to the side wall 22 of the shell structure, it can be seen that the two layers at the edge are fixedly connected together, that is, the edges of the first layer 23 and the second layer 24 are fixedly connected.
壳结构是指将电池单体20的内部环境隔绝于外部环境的部件。本申请对壳结构的形状不做限定，只要能够形成四周固定连接的结构即可。The shell structure refers to a component that isolates the internal environment of the battery cell 20 from the external environment. The present application does not limit the shape of the shell structure, as long as it can form a structure that is fixedly connected all around.
顶壁21，软包电池中用于设置极耳21a的一侧。侧壁22，软包电池中除去设置极耳21a的一侧的其它侧。片层，为用于成型出软包电池壳结构的单元壳体结构，可以理解为膜层结构。The top wall 21 is a side of the soft-pack battery where the tab 21a is provided. The side wall 22 is the other side of the soft-pack battery except the side where the tab 21a is provided. The sheet layer is a unit shell structure used to form a soft-pack battery shell structure, which can be understood as a film layer structure.
壳结构在软包电池单体20中形成的内部环境可以用于容纳卷芯、电解液以及其他部件。其中，软包电池的卷芯和硬壳电池的电芯组件承载的功能类似，都是电池单体20中发生电化学反应的部件。本申请的壳结构内可以包含一个或更多个卷芯。卷芯主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成卷芯的主体部，正极片和负极片不具有活性物质的部分各自构成极耳21a。正极极耳21a和负极极耳21a可以共同位于主体部的一端或是分别位于主体部的两端。示例性的，本申请中的卷芯的两个极耳21a共同位于壳结构的顶壁21。在电池的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳21a连接电极端子以形成电流回路。The internal environment formed by the shell structure in the soft-pack battery cell 20 can be used to accommodate the core, electrolyte and other components. Among them, the core of the soft-pack battery and the cell assembly of the hard-shell battery carry similar functions, and are both components in the battery cell 20 where electrochemical reactions occur. The shell structure of the present application may contain one or more cores. The core is mainly formed by winding or stacking the positive and negative electrodes, and a diaphragm is usually provided between the positive and negative electrodes. The parts of the positive and negative electrodes with active materials constitute the main body of the core, and the parts of the positive and negative electrodes without active materials each constitute the pole ear 21a. The positive pole ear 21a and the negative pole ear 21a can be located together at one end of the main body or at both ends of the main body respectively. Exemplarily, the two pole ears 21a of the core in the present application are located together on the top wall 21 of the shell structure. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ear 21a connects the electrode terminal to form a current loop.
根据本申请的一些实施例，请参照图1-图6，本申请提供了一种壳结构，用于电池100或电池单体20，壳结构包括第一片层23、第二片层24和测试部，第一片层23的周侧包括第一边缘部231，第二片层24与第一片层23相对设置，第二片层24的周侧包括第二边缘部241，第一边缘部231与第二边缘部241熔合形成内部空腔的壳体，第一边缘部231与第二边缘部241之间相互熔合的区域为树脂融合区40。测试部贯穿树脂融合区40，连通外界与内部空腔，并被构造为允许内部空腔的气体经由测试部释放至外界。According to some embodiments of the present application, please refer to FIG. 1-FIG. 6. The present application provides a shell structure for a battery 100 or a battery cell 20. The shell structure includes a first sheet 23, a second sheet 24 and a test part. The first sheet 23 includes a first edge part 231 on the periphery. The second sheet 24 is arranged opposite to the first sheet 23. The second sheet 24 includes a second edge part 241 on the periphery. The first edge part 231 and the second edge part 241 are fused to form a shell with an internal cavity. The area where the first edge part 231 and the second edge part 241 are fused to each other is a resin fusion area 40. The test part runs through the resin fusion area 40, connects the outside with the internal cavity, and is configured to allow the gas in the internal cavity to be released to the outside through the test part.
示例性的，本申请实施例的第一片层23和第二片层24均可以理解为是铝塑膜，即，第一片层23为第一铝塑膜，第二片层24为第二铝塑膜。示例性的，本申请实施例对测试部的构造、形状特征等不做限定，只要能够实现内部空腔与外界的连通即可。示例性的，本申请实施例的第一熔合树脂层2313和第二熔合树脂层2413均可以采用热熔胶层。其中，热熔胶是一种可塑性的粘合剂，常温呈固体状态，加热融化后能快速粘接。本申请实施例中的测试部为结合热熔胶的特性得出的用于连通外界及内部空腔的构造特 征。在壳结构成型过程中即可成型出测试部，工艺简单，成型效率高，便于操作。并且本申请实施例的测试部的结构尺寸及方向设置均根据实际需要来定，只要能够实现外界与内部空腔之间的连通即可。参考图4，为软包电池的热封工艺平面示意图，其中网格区域显示的壳结构的周边为热封区，即，第一边缘部231与第二边缘部241之间热熔成一体边的结构。Exemplarily, the first layer 23 and the second layer 24 of the embodiment of the present application can be understood as aluminum-plastic film, that is, the first layer 23 is a first aluminum-plastic film, and the second layer 24 is a second aluminum-plastic film. Exemplarily, the embodiment of the present application does not limit the structure, shape characteristics, etc. of the test part, as long as the connection between the internal cavity and the outside world can be achieved. Exemplarily, the first fusible resin layer 2313 and the second fusible resin layer 2413 of the embodiment of the present application can both adopt hot melt adhesive layers. Among them, hot melt adhesive is a plastic adhesive that is solid at room temperature and can be quickly bonded after being heated and melted. The test part in the embodiment of the present application is a structural feature for connecting the outside world and the internal cavity obtained by combining the characteristics of hot melt adhesive. Features. The test part can be formed during the shell structure molding process, the process is simple, the molding efficiency is high, and the operation is easy. And the structural size and direction setting of the test part of the embodiment of the present application are determined according to actual needs, as long as the connection between the outside and the internal cavity can be achieved. Refer to Figure 4, which is a plan view of the heat sealing process of the soft-pack battery, in which the periphery of the shell structure shown in the grid area is the heat sealing area, that is, the structure of the first edge portion 231 and the second edge portion 241 that are heat-fused into an integral edge.
本申请实施例的技术方案中，在用于组成电池单体20或电池的壳结构的边缘，也就是第一边缘部231与第二边缘部241之间的树脂融合区40内通过热熔的方式成型出测试部，通过该测试部实现外界与壳结构内部空腔之间的连通，使得不管是采用负压压差法还是氦检法，能够通过向内部空腔加压或填充氦气的方式，在测试部的预置下，内部空腔加压或填充的气体会经由测试部释放至外界，根据内部空腔内气体的压强或压力值的变化，来校验各校验设备是否能够检测出由于该测试部的存在导致的压差变化或氦气填充量的变化，即校验出相应校验设备校验结果的准确性。In the technical solution of the embodiment of the present application, a test part is formed by hot melting in the edge of the shell structure used to constitute the battery cell 20 or the battery, that is, in the resin fusion area 40 between the first edge portion 231 and the second edge portion 241, and the test part is used to achieve communication between the outside and the internal cavity of the shell structure, so that no matter whether the negative pressure differential method or the helium detection method is adopted, the internal cavity can be pressurized or filled with helium. Under the preset of the test part, the gas pressurized or filled in the internal cavity will be released to the outside through the test part, and according to the change of the pressure or pressure value of the gas in the internal cavity, it is verified whether each verification device can detect the pressure difference change or the helium filling amount change caused by the existence of the test part, that is, the accuracy of the verification result of the corresponding verification device is verified.
在一些实施例中，测试部被构造为沿树脂融合区40的宽度方向热熔成型。采用本方案能够制备出软包电池热封区带有的微孔长度与生产过程中热封区(也就是树脂融合区40)宽度一致，准确模拟电池热封区出现的微孔缺陷，提高校验检测检测***检出微型漏孔的准确性。In some embodiments, the test portion is configured to be hot-melt molded along the width direction of the resin fusion zone 40. This solution can be used to prepare a soft-pack battery heat-sealed zone with micropores whose length is consistent with the width of the heat-sealed zone (that is, the resin fusion zone 40) during the production process, accurately simulating the micropore defects in the heat-sealed zone of the battery, and improving the accuracy of the verification and detection system in detecting micro leaks.
在一些实施例中，第一片层23与第二片层24为整体片层，整体片层经由折叠或弯曲形成相对设置的第一片层23和第二片层24。示例性的，本申请实施例中的第一片层23和第二片层24可以为整体片层，采用整体片层的方案，能够节省加工工艺成本，提高生产效率。示例性的，本申请实施例中的第一片层23和第二片层24也可以为相互独立的两片结构，能够节省加工工序，从另一方面提高生产效率。当本申请实施例中的第一片层23和第二片层24为整体片层，经由折弯或弯曲形成第一片层23和第二片层24时，第一片层23与第二片层24之间依然是在各自周边的第一边缘部231和第二边缘部241进行热熔固定连接。但能够节省软包电池的整体加工工艺的工艺成本，或者，还能够减少部分工艺步骤，进一步降低工艺成本。In some embodiments, the first sheet layer 23 and the second sheet layer 24 are integral sheets, and the integral sheets are formed by folding or bending to form the first sheet layer 23 and the second sheet layer 24 that are relatively arranged. Exemplarily, the first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application can be an integral sheet layer. The use of the integral sheet layer solution can save processing technology costs and improve production efficiency. Exemplarily, the first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application can also be two independent sheets, which can save processing steps and improve production efficiency from another aspect. When the first sheet layer 23 and the second sheet layer 24 in the embodiment of the present application are integral sheets, and the first sheet layer 23 and the second sheet layer 24 are formed by bending or bending, the first sheet layer 23 and the second sheet layer 24 are still hot-melt fixedly connected at the first edge portion 231 and the second edge portion 241 of each periphery. However, the process cost of the overall processing technology of the soft-pack battery can be saved, or some process steps can be reduced to further reduce the process cost.
第一方向，可以参考图5中的C1方向，其中，第一方向为第一片层23的厚度方向。第二方向，可以参考图5中的C2方向，其中，第二方向为与第一方向相反的方向。预制件30，为用于成型出测试部而使用的过程部件，在成型出测试部的结构后需要抽离。The first direction may refer to the C1 direction in FIG5 , wherein the first direction is the thickness direction of the first sheet layer 23. The second direction may refer to the C2 direction in FIG5 , wherein the second direction is the opposite direction to the first direction. The preform 30 is a process component used to form the test part, and needs to be removed after the structure of the test part is formed.
在一些实施例中，参考图5，第一边缘部231沿第一方向依次包括相互覆盖固定的第一尼龙层2311、第一铝层2312和第一熔合树脂层2313，第二边缘部241沿第二方向依次包括相互覆盖固定的第二尼龙层2411、第二铝层2412和第二熔合树脂层2413，其中，第一方向和第二方向相反设置；第一边缘部231和第二边缘部241经由第一熔合树脂层2313、第二熔合树脂层2413熔合形成树脂融合区40；测试部被构造为由预制件 30在树脂融合区40高温熔合形成的孔形结构31并能够将预制件30移出。其中，由尼龙层、铝层和熔合树脂层组成的铝塑膜具有柔韧性好，防潮、隔氧、遮光、屏蔽、抗静电、可抽真空，可彩印的效果。In some embodiments, referring to FIG5 , the first edge portion 231 includes a first nylon layer 2311, a first aluminum layer 2312, and a first fused resin layer 2313 that are mutually covered and fixed in sequence along the first direction, and the second edge portion 241 includes a second nylon layer 2411, a second aluminum layer 2412, and a second fused resin layer 2413 that are mutually covered and fixed in sequence along the second direction, wherein the first direction and the second direction are arranged oppositely; the first edge portion 231 and the second edge portion 241 are fused via the first fused resin layer 2313 and the second fused resin layer 2413 to form a resin fusion zone 40; the test portion is constructed by prefabricating The hole-shaped structure 31 formed by high-temperature fusion of the resin fusion zone 40 can remove the preform 30. The aluminum-plastic film composed of the nylon layer, the aluminum layer and the fused resin layer has good flexibility, moisture-proof, oxygen-proof, light-shielding, shielding, anti-static, vacuum-drawable, and color-printable effects.
示例性的，树脂融合区40为两片铝塑膜在各自边缘熔合成型的结构区域，测试部是由预制件30通过高温熔合在该树脂融合区40成型，并在固态成型后将预制件30移出，以使树脂融合区40能够成型出与测试部外廓相适应的孔形结构31。采用本申请实施例的应用预制件30熔合成型的孔形结构31，在树脂融合区40热熔、成型、冷却凝固后，能够得到固定形态的孔形结构31，可以理解为，采用本申请实施例的方式得到该测试部的孔形结构31，可以根据实际校验的需要而设定该孔形结构31的位置。另外，预制件30的结构及尺寸与所需的测试部的结构及尺寸相适配，本申请对此不做限定。示例性的，预置于树脂融合区40的预制件30可以采用金属材质。示例性的，当采用预制件30为金属丝时，可以根据金属丝的直径不同，从树脂融合区40抽离后可以形成贯穿树脂融合区40的均一性孔径微孔，用于模拟不同程度的电池泄漏率，用以检验检测***对不同泄漏程度的检出能力。Exemplarily, the resin fusion zone 40 is a structural area where two pieces of aluminum-plastic films are fused at their respective edges. The test part is formed in the resin fusion zone 40 by high-temperature fusion of the preform 30, and the preform 30 is removed after solid-state molding, so that the resin fusion zone 40 can form a hole-shaped structure 31 that is adapted to the outer contour of the test part. The hole-shaped structure 31 formed by the preform 30 of the embodiment of the present application can obtain a hole-shaped structure 31 of a fixed shape after the resin fusion zone 40 is hot-melted, molded, cooled and solidified. It can be understood that the hole-shaped structure 31 of the test part is obtained by the method of the embodiment of the present application, and the position of the hole-shaped structure 31 can be set according to the needs of actual verification. In addition, the structure and size of the preform 30 are compatible with the structure and size of the required test part, and this application does not limit this. Exemplarily, the preform 30 pre-placed in the resin fusion zone 40 can be made of metal. Exemplarily, when the preform 30 is a metal wire, uniform pores can be formed through the resin fusion area 40 after being pulled out from the resin fusion area 40 according to the different diameters of the metal wire, so as to simulate different degrees of battery leakage rate and test the detection system's ability to detect different degrees of leakage.
顶壁21，参考图3，软包电池中用于布置极耳21a的一侧边为壳结构的顶壁21位置。侧壁22，参考图3，软包电池中除去布置极耳21a的一边的其它边，均为壳结构中的侧壁22位置。顶壁21和侧壁22均可以由两片铝塑膜熔合成型。The top wall 21, referring to FIG3, is a side edge of the soft-pack battery for arranging the pole ear 21a, which is the top wall 21 position of the shell structure. The side wall 22, referring to FIG3, is a side wall 22 position of the shell structure except for the side edge of the soft-pack battery for arranging the pole ear 21a. The top wall 21 and the side wall 22 can be formed by fusing two pieces of aluminum-plastic film.
在一些实施例中，第一边缘部231布置于第一片层23的第一侧壁22，第二边缘部241布置于第二片层24的第二侧壁22，第一侧壁22与第二侧壁22的位置对应设置；孔形结构31位于第一侧壁22、第二侧壁22所在侧的树脂融合区40内。In some embodiments, the first edge portion 231 is arranged on the first side wall 22 of the first layer 23, the second edge portion 241 is arranged on the second side wall 22 of the second layer 24, and the positions of the first side wall 22 and the second side wall 22 are correspondingly arranged; the hole-shaped structure 31 is located in the resin fusion area 40 on the side where the first side wall 22 and the second side wall 22 are located.
示例性的，本申请实施例的侧壁22可以理解为除顶壁21以外的周侧任一侧的侧壁22。示例性的，将第一侧壁22设置的方位与第二侧壁22的方位对应以得到同一侧壁22的树脂融合区40。该孔形结构31可以位于与第一侧壁22、第二侧壁22所在侧的树脂融合区40内。且，示例性的，孔形结构31可以为圆孔、方孔、角形孔、梯形孔或者不规则孔中的任意一种。示例性的，本申请对该孔形结构31的结构、形状、孔深及开孔方向等不做限定。示例性的，孔形结构31可以为贯穿图4所示各侧壁22或顶壁21的热封区域(树脂融合区40)的孔径均一的结构。示例性的，孔形结构31可以为沿热封区(树脂融合区40)的宽度方向热熔成型，以使制备的软包电池热封区带有的微孔长度与生产过程中热封区宽度一致，准确模拟电池热封区出现的微孔缺陷，提高校验检测检测***检出微型漏孔的准确性。Exemplarily, the side wall 22 of the embodiment of the present application can be understood as the side wall 22 on any side of the circumferential side except the top wall 21. Exemplarily, the orientation of the first side wall 22 is set to correspond to the orientation of the second side wall 22 to obtain the resin fusion zone 40 of the same side wall 22. The hole-shaped structure 31 can be located in the resin fusion zone 40 on the side where the first side wall 22 and the second side wall 22 are located. And, exemplary, the hole-shaped structure 31 can be any one of a circular hole, a square hole, an angular hole, a trapezoidal hole or an irregular hole. Exemplarily, the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure 31. Exemplarily, the hole-shaped structure 31 can be a structure with a uniform pore size throughout the heat-sealed area (resin fusion zone 40) of each side wall 22 or top wall 21 shown in Figure 4. Exemplarily, the hole-shaped structure 31 can be hot-melt formed along the width direction of the heat-sealing area (resin fusion area 40) so that the length of the micropores in the heat-sealing area of the prepared soft-pack battery is consistent with the width of the heat-sealing area during the production process, accurately simulating the micropore defects in the heat-sealing area of the battery, and improving the accuracy of the verification and detection system in detecting micro leaks.
采用本方案的壳结构，能够将该孔形结构31热熔成型于任一侧壁22的位置，用于检测侧壁22连接位置的微孔缺陷的校验设备的准确性检测，能够全面模拟电池热封区出现的微孔缺陷区域，准确检验检测***检出微型漏孔缺陷的可靠性。 By adopting the shell structure of the present scheme, the hole-shaped structure 31 can be hot-melt formed at the position of any side wall 22, and the accuracy detection of the verification equipment used to detect micropore defects at the connection position of the side wall 22 can be fully simulated. The micropore defect area that appears in the heat sealing area of the battery can accurately test the reliability of the detection system in detecting micro-leakage defects.
极耳树脂层21b，参考图6，为用于将极耳21a夹设于树脂融合区40之内的极耳21a胶，极耳树脂层21b的材质可以与第一熔合树脂层2313、第二熔合树脂层2413的材质相同。The tab resin layer 21 b , referring to FIG. 6 , is a tab glue for sandwiching the tab 21 a within the resin fusion area 40 . The material of the tab resin layer 21 b may be the same as that of the first fusion resin layer 2313 and the second fusion resin layer 2413 .
在一些实施例中，第一边缘部231布置于第一片层23的第一顶壁21，第二边缘部241布置于第二片层24的第二顶壁21，第一顶壁21与第二顶壁21对应设置，第一熔合树脂层2313与第二熔合树脂层2413之间夹设有极耳树脂层21b，极耳树脂层21b被构造于将极耳21a固定于第一顶壁21与第二顶壁21之间；树脂融合区40位于第一熔合树脂层2313与极耳树脂层21b之间，和/或，树脂融合区40位于第二熔合树脂层2413与极耳树脂层21b之间。In some embodiments, the first edge portion 231 is arranged on the first top wall 21 of the first layer 23, the second edge portion 241 is arranged on the second top wall 21 of the second layer 24, the first top wall 21 and the second top wall 21 are arranged correspondingly, and a pole ear resin layer 21b is sandwiched between the first fusion resin layer 2313 and the second fusion resin layer 2413, and the pole ear resin layer 21b is constructed to fix the pole ear 21a between the first top wall 21 and the second top wall 21; the resin fusion zone 40 is located between the first fusion resin layer 2313 and the pole ear resin layer 21b, and/or, the resin fusion zone 40 is located between the second fusion resin layer 2413 and the pole ear resin layer 21b.
采用本申请实施例的壳结构，该孔形结构31可以位于第一顶壁21、第二顶壁21所在侧的树脂融合区40内。且，进一步的，该孔形结构31可以位于第一顶壁21、第二顶壁21所在侧的第一熔合树脂层2313与极耳树脂层21b之间，和/或，该孔形结构31可以位于第一顶壁21、第二顶壁21所在侧的第二熔合树脂层2413与极耳树脂层21b之间。示例性的，本申请实施例对该孔形结构31的结构、形状、孔深及开孔方向等不做限定。采用本方案实施例的壳结构，能够将该孔形结构31热熔成型于顶壁21的上述相应位置，用于检测顶壁21连接位置的微孔缺陷的校验设备的准确性检测。By adopting the shell structure of the embodiment of the present application, the hole-shaped structure 31 can be located in the resin fusion area 40 on the side where the first top wall 21 and the second top wall 21 are located. Furthermore, the hole-shaped structure 31 can be located between the first fused resin layer 2313 and the tab resin layer 21b on the side where the first top wall 21 and the second top wall 21 are located, and/or, the hole-shaped structure 31 can be located between the second fused resin layer 2413 and the tab resin layer 21b on the side where the first top wall 21 and the second top wall 21 are located. Exemplarily, the embodiment of the present application does not limit the structure, shape, hole depth and opening direction of the hole-shaped structure 31. By adopting the shell structure of the embodiment of the present scheme, the hole-shaped structure 31 can be hot-melt-formed at the above-mentioned corresponding position of the top wall 21, and can be used for accuracy detection of the calibration equipment for detecting micropore defects at the connection position of the top wall 21.
在一些实施例中，第一熔合树脂层2313和第二熔合树脂层2413的熔点小于300℃，示例性的，本申请实施例中所应用的预制件30的熔点大于300℃，以使树脂融合区40能够在300℃以下实现融化结合再固定的过程，以进一步成型出该孔形结构31。In some embodiments, the melting points of the first fusible resin layer 2313 and the second fusible resin layer 2413 are less than 300°C. Exemplarily, the melting point of the preform 30 used in the embodiment of the present application is greater than 300°C, so that the resin fusion zone 40 can achieve a process of melting, combining and then fixing below 300°C to further form the hole-shaped structure 31.
在一些实施例中，参考图5和图6，孔形结构31构造为微孔。示例性的，本申请的微孔为小于2纳米的小孔，以适应相应侧的树脂融合区40的孔形结构31。微孔的结构尺寸较小，以适应本申请实施例中的软包电池的结构设定。In some embodiments, referring to FIG. 5 and FIG. 6 , the pore structure 31 is configured as a micropore. Exemplarily, the micropore of the present application is a small hole less than 2 nanometers to accommodate the pore structure 31 of the resin fusion zone 40 on the corresponding side. The micropore has a relatively small structural size to accommodate the structural setting of the soft-pack battery in the embodiment of the present application.
在一些实施例中，参考图5和图6，微孔的内壁包含在树脂融合区40范围内。以使微孔的热熔成型的尺寸不会超出树脂融合区40的范围，进一步确保本申请实施例的壳结构能够用于微孔缺陷的校验设备的准确性检测。如图5所示，微孔可以设置在两片铝塑膜之间的可以进行热熔成型的第一热熔树脂层和第二热熔树脂层之间的任意位置。如图6所示，为沿B向对顶壁夹设极耳的树脂融合区40的放大结构示意图。可以看出，微孔可以设置在极耳树脂层21b与第一热熔树脂层之间的任意位置，或者，微孔也可以设置在极耳树脂层21b与第二热熔树脂层之间的任意位置。In some embodiments, with reference to Fig. 5 and Fig. 6, the inner wall of the micropore is contained within the range of the resin fusion zone 40. So that the size of the hot-melt molding of the micropore will not exceed the range of the resin fusion zone 40, further ensuring that the shell structure of the embodiment of the present application can be used for the accuracy detection of the verification equipment of the micropore defects. As shown in Fig. 5, the micropore can be arranged at any position between the first hot-melt resin layer and the second hot-melt resin layer that can be hot-melt molded between two pieces of aluminum-plastic films. As shown in Fig. 6, it is an enlarged structural schematic diagram of the resin fusion zone 40 of the pole ear clamped on the top wall along the B direction. It can be seen that the micropore can be arranged at any position between the pole ear resin layer 21b and the first hot-melt resin layer, or the micropore can also be arranged at any position between the pole ear resin layer 21b and the second hot-melt resin layer.
在一些实施例中，微孔的内廓径向尺寸范围为10um—100um。进一步确保微孔结构尺寸不会超出树脂融合区的范围，以使本申请实施例的壳结构能够用于微孔缺陷的校验设备的准确性检测。In some embodiments, the inner radial size of the micropores ranges from 10um to 100um. It is further ensured that the size of the micropore structure does not exceed the range of the resin fusion zone, so that the shell structure of the embodiment of the present application can be used for accuracy detection of micropore defect verification equipment.
另外，在热封工艺过程中即可对壳结构内部注入氦气，以使成型之后的软包电池 可以应用于氦检泄漏检测***，电池可灵活制备成与在线产品一致的结构，放置于整个氦检***中用于对整个检漏***进行校验。In addition, helium can be injected into the shell structure during the heat sealing process to make the soft-pack battery It can be applied to helium leak detection system. The battery can be flexibly prepared into a structure consistent with the online product and placed in the entire helium leak detection system to calibrate the entire leak detection system.
基于以上的结构描述，下面结合工艺过程进一步详述。以预制件30为柱形金属丝为例，对本申请实施例的带有微漏缺陷的电池的工艺过程进行描述，电池热封前在需要相互之间边缘密封的第一铝塑膜和第二铝塑膜之间放置预设直径的金属丝，预设直径可以理解为与实际待检测的微漏孔的尺寸相对应。之后通过封头热封两片铝塑膜，将金属丝融合于两片铝塑膜的树脂融合区40内，待树脂融合区40经由热熔后的液态固化成质地均一且结构稳定的结构后，抽离过程中的金属丝，抽离后，在原金属丝所在位置成型出空质结构，也就是孔形结构31，则得到带有贯穿热封区孔径均一的微孔结构的软包电池，作为气密标准泄漏块用于校验检测***的准确性。制备的软包电池热封区带有的微孔长度与生产过程中热封区宽度一致，造孔位置可灵活放置于主体(壳结构的任一侧壁22)及极耳21a的热封区域的封印处(壳结构顶壁21夹设极耳21a的树脂融合区40)，全面模拟电池热封区出现的微孔缺陷区域，准确检验检测***检出微型漏孔缺陷的可靠性。本申请实施例的电池在热封时注入氦气，同样可应用于检测氦检泄漏检测***可靠性，电池可灵活制备成与在线产品一致的结构，放置于整个氦检***中用于对整个检漏***进行校验，而非仅对氦检仪进行校验。Based on the above structural description, the following is further described in detail in conjunction with the process. Taking the preform 30 as a cylindrical metal wire as an example, the process of the battery with micro-leakage defects in the embodiment of the present application is described. Before the battery is heat-sealed, a metal wire of a preset diameter is placed between the first aluminum-plastic film and the second aluminum-plastic film that need to be sealed at the edges with each other. The preset diameter can be understood as corresponding to the size of the actual micro-leak hole to be detected. After that, the two pieces of aluminum-plastic film are heat-sealed by the head, and the metal wire is fused into the resin fusion area 40 of the two pieces of aluminum-plastic film. After the resin fusion area 40 is solidified into a structure with uniform texture and stable structure through the liquid state after hot melting, the metal wire in the process is extracted. After extraction, an empty structure, that is, a hole-shaped structure 31, is formed at the position of the original metal wire, and a soft-pack battery with a microporous structure with uniform pore diameter running through the heat-sealed area is obtained, which is used as an airtight standard leakage block to verify the accuracy of the detection system. The length of the micropores in the heat-sealed area of the prepared soft-pack battery is consistent with the width of the heat-sealed area during the production process. The hole-making position can be flexibly placed at the seal of the heat-sealed area of the main body (any side wall 22 of the shell structure) and the pole ear 21a (the resin fusion area 40 where the pole ear 21a is clamped by the top wall 21 of the shell structure), fully simulating the micropore defect area appearing in the heat-sealed area of the battery, and accurately testing the reliability of the detection system in detecting micro-leakage defects. The battery of the embodiment of the present application is injected with helium during heat sealing, and can also be used to detect the reliability of the helium leak detection system. The battery can be flexibly prepared into a structure consistent with the online product and placed in the entire helium detection system for calibrating the entire leak detection system, rather than just calibrating the helium detector.
本申请实施例还提供了一种电池单体20，其包括上述任一实施例中的壳结构、卷芯和极耳21a，卷芯容纳于内部空腔内，极耳21a夹设于第一边缘部231与第二边缘部241之间，且伸出于第一边缘部231和第二边缘部241。能够实现上述任一实施例的效果，在此不做赘述。The embodiment of the present application further provides a battery cell 20, which includes the shell structure, winding core and pole lug 21a in any of the above embodiments, the winding core is accommodated in the internal cavity, and the pole lug 21a is sandwiched between the first edge portion 231 and the second edge portion 241, and extends from the first edge portion 231 and the second edge portion 241. The effects of any of the above embodiments can be achieved, and no further description is given here.
本申请实施例还提供了一种电池，其包括多个上述实施例中的电池单体20，沿预设方向并排设置；其中，预设方向为任意一个方向。能够实现上述任一实施例的效果，在此不做赘述。The present application also provides a battery, which includes a plurality of battery cells 20 in the above embodiment, arranged side by side along a preset direction; wherein the preset direction is any direction. The effect of any of the above embodiments can be achieved, which will not be described in detail here.
本申请实施例再提供了一种用电装置，其包括上述实施例中的电池，电池用于提供电能。能够实现上述任一实施例的效果，在此不做赘述。The present application further provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy. The effect of any of the above embodiments can be achieved, and no further description is given here.
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。 The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims (14)

  1. 一种壳结构，用于电池或电池单体，所述壳结构包括：A shell structure for a battery or a battery cell, the shell structure comprising:
    第一片层，所述第一片层的周侧包括第一边缘部；A first sheet layer, wherein the peripheral side of the first sheet layer includes a first edge portion;
    第二片层，与所述第一片层相对设置，所述第二片层的周侧包括第二边缘部，所述第一边缘部与所述第二边缘部熔合形成内部空腔的壳体，所述第一边缘部与所述第二边缘部之间相互熔合的区域为树脂融合区；A second sheet layer is arranged opposite to the first sheet layer, the peripheral side of the second sheet layer includes a second edge portion, the first edge portion and the second edge portion are fused to form a shell with an internal cavity, and the area where the first edge portion and the second edge portion are fused to each other is a resin fusion area;
    测试部，贯穿所述树脂融合区，连通外界与所述内部空腔，并被构造为允许所述内部空腔的气体经由所述测试部释放至外界。The testing part penetrates the resin fusion area, connects the outside with the internal cavity, and is configured to allow the gas in the internal cavity to be released to the outside through the testing part.
  2. 根据权利要求1所述的壳结构，其中，所述测试部被构造为沿所述树脂融合区的宽度方向热熔成型。The shell structure according to claim 1, wherein the test portion is configured to be heat-melt molded along a width direction of the resin fusion zone.
  3. 根据权利要求2所述的壳结构，其中，所述第一片层与所述第二片层为整体片层，所述整体片层经由折叠或弯曲形成相对设置的所述第一片层和所述第二片层。The shell structure according to claim 2, wherein the first sheet layer and the second sheet layer are an integral sheet layer, and the integral sheet layer is formed by folding or bending to form the first sheet layer and the second sheet layer that are relatively arranged.
  4. 根据权利要求3所述的壳结构，其中，所述第一边缘部沿第一方向依次包括相互覆盖固定的第一尼龙层、第一铝层和第一熔合树脂层，所述第二边缘部沿第二方向依次包括相互覆盖固定的第二尼龙层、第二铝层和第二熔合树脂层，其中，所述第一方向和所述第二方向相反设置；The shell structure according to claim 3, wherein the first edge portion includes a first nylon layer, a first aluminum layer, and a first fused resin layer that are covered and fixed to each other in sequence along a first direction, and the second edge portion includes a second nylon layer, a second aluminum layer, and a second fused resin layer that are covered and fixed to each other in sequence along a second direction, wherein the first direction and the second direction are arranged oppositely;
    所述第一边缘部和所述第二边缘部经由所述第一熔合树脂层、所述第二熔合树脂层熔合形成所述树脂融合区；The first edge portion and the second edge portion are fused via the first fusible resin layer and the second fusible resin layer to form the resin fusion area;
    所述测试部被构造为由预制件在所述树脂融合区高温熔合形成的孔形结构并能够将所述预制件移出。The testing portion is configured as a hole-shaped structure formed by high-temperature fusion of the preform in the resin fusion zone and capable of removing the preform.
  5. 根据权利要求4所述的壳结构，其中，所述第一边缘部布置于所述第一片层的第一侧壁，所述第二边缘部布置于所述第二片层的第二侧壁，所述第一侧壁与所述第二侧壁的位置对应设置；The shell structure according to claim 4, wherein the first edge portion is arranged on a first side wall of the first sheet layer, the second edge portion is arranged on a second side wall of the second sheet layer, and the first side wall and the second side wall are arranged at positions corresponding to each other;
    所述孔形结构位于所述第一侧壁、所述第二侧壁所在侧的所述树脂融合区内。The hole-shaped structure is located in the resin fusion area on the side where the first side wall and the second side wall are located.
  6. 根据权利要求4所述的壳结构，其中，所述第一边缘部布置于所述第一片层的第一顶壁，所述第二边缘部布置于所述第二片层的第二顶壁，所述第一顶壁与所述第二顶壁对应设置，所述第一熔合树脂层与所述第二熔合树脂层之间夹设有极耳树脂层，所述极耳树脂层被构造于将极耳固定于所述第一顶壁与所述第二顶壁之间；The shell structure according to claim 4, wherein the first edge portion is arranged on the first top wall of the first sheet layer, the second edge portion is arranged on the second top wall of the second sheet layer, the first top wall and the second top wall are arranged correspondingly, and a tab resin layer is sandwiched between the first fusion resin layer and the second fusion resin layer, and the tab resin layer is configured to fix the tab between the first top wall and the second top wall;
    所述树脂融合区位于所述第一熔合树脂层与所述极耳树脂层之间，和/或，所述树脂融合区位于所述第二熔合树脂层与所述极耳树脂层之间。The resin fusion zone is located between the first fusion resin layer and the tab resin layer, and/or the resin fusion zone is located between the second fusion resin layer and the tab resin layer.
  7. 根据权利要求5或6所述的壳结构，其中，所述第一熔合树脂层和所述第二熔合树脂 层的熔点小于300℃。The shell structure according to claim 5 or 6, wherein the first fusible resin layer and the second fusible resin layer The melting point of the layer is less than 300°C.
  8. 根据权利要求5或6所述的壳结构，其中，所述孔形结构构造为微孔。The shell structure according to claim 5 or 6, wherein the hole-shaped structure is configured as micropores.
  9. 根据权利要求8所述的壳结构，其中，所述微孔的内壁包含在所述树脂融合区范围内。The shell structure according to claim 8, wherein the inner wall of the micropore is contained within the range of the resin fusion zone.
  10. 根据权利要求9所述的壳结构，其中，所述微孔的内廓径向尺寸范围为10um—100um。The shell structure according to claim 9, wherein the inner radial dimension range of the micropores is 10um-100um.
  11. 根据权利要求1-10中任一项所述的壳结构，其中，所述壳结构被构造为在热熔成型过程中向所述内部空腔填充氦气。The shell structure according to any one of claims 1-10, wherein the shell structure is configured to fill the inner cavity with helium during hot melt molding.
  12. 一种电池单体，包括：A battery cell, comprising:
    如权利要求1至11中任一项所述的壳结构；The shell structure according to any one of claims 1 to 11;
    卷芯，容纳于所述内部空腔内；及a winding core received in the inner cavity; and
    极耳，夹设于所述第一边缘部与所述第二边缘部之间，且伸出于所述第一边缘部和所述第二边缘部。The pole ear is sandwiched between the first edge portion and the second edge portion, and extends out of the first edge portion and the second edge portion.
  13. 一种电池，包括：A battery comprising:
    多个如权利要求12所述的电池单体，沿预设方向并排设置；A plurality of battery cells as claimed in claim 12, arranged side by side along a preset direction;
    其中，所述预设方向为任意一个方向。The preset direction is any direction.
  14. 一种用电装置，包括如权利要求13中所述的电池，所述电池用于提供电能。 An electrical device comprising the battery as claimed in claim 13, wherein the battery is used for providing electrical energy.
PCT/CN2023/074106 2022-10-10 2023-02-01 Shell structure, battery cell, battery, and electric device WO2024077814A1 (en)

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