Top sealing structure of battery and battery

Abstract

A top sealing structure is used for packaging a battery packaging area, the battery packaging area comprises an aluminum plastic film and a tab extending out of an opening of the aluminum plastic film, and the top sealing structure comprises an upper sealing head, a lower sealing head, a first elastic block and a second elastic block; a first open groove is formed in the lower sealing head, a first elastic block and a second elastic block are arranged at the first end and the second end of the first open groove respectively, the battery packaging area is pressed in the first open groove through the upper sealing head, and one end of the battery packaging area is in contact extrusion with the first elastic block. The other end of the battery packaging area is in contact extrusion with the second elastic block, and the first elastic block and the second elastic block can generate elastic deformation so as to adjust the size of a gap between one end of the battery packaging area and the first end of the first slot and the size of a gap between the other end of the battery packaging area and the second end of the first slot. The top sealing structure can solve the problems of liquid leakage or corrosion and the like of the top sealing position caused by the fact that the center of the battery packaging area deviates from the center of the sealing head slotting.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a top sealing structure of a battery and a battery including the top sealing structure. Background Technology

[0002] In pouch lithium-ion batteries, positive and negative current collectors are connected to external terminals via tabs to enable the connection of electronic channels. The tabs are heat-sealed together with aluminum-plastic film through tab adhesive on their outer surface.

[0003] like Figure 1 As shown, in existing technologies, the top seal typically uses a double-layer rectangular groove 800. During the actual encapsulation process, there is a deviation between the battery encapsulation area (aluminum-plastic film and tab) and the center of the top seal groove. One end of the battery encapsulation area tends to shift towards the grooved end of the top seal. This shifted end is prone to excessive compression between the CPP adhesive on the outer surface of the tab and the CPP adhesive on the inner surface of the aluminum-plastic film, resulting in the CPP adhesive layer between the tab and the aluminum-plastic film being squeezed to an extremely thin state. This leads to a short circuit between the aluminum layer of the aluminum-plastic film and the tab, causing corrosion. Meanwhile, a large gap remains between the tab and the grooved end of the top seal, preventing the CPP adhesive from filling the groove space. Consequently, the top seal cannot properly encapsulate the battery encapsulation area, leading to leakage of the aluminum-plastic film. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned deficiencies in the prior art by providing a top sealing structure for a battery and a battery. The top sealing structure of the battery can effectively solve the problem of leakage or corrosion of the battery packaging area due to the deviation of the center of the battery packaging area from the center of the top sealing structure groove during the packaging process.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A top sealing structure for encapsulating a battery encapsulation area includes an aluminum-plastic film and tabs extending from an opening in the aluminum-plastic film. The structure includes an upper sealing head, a lower sealing head, a first elastic block, and a second elastic block. A first slot is formed on the lower sealing head. A first elastic block and a second elastic block are respectively provided at a first end and a second end of the first slot. The upper sealing head presses the battery encapsulation area tightly within the first slot. One end of the battery encapsulation area contacts and is pressed against the first elastic block, and the other end of the battery encapsulation area contacts and is pressed against the second elastic block. The first and second elastic blocks can undergo elastic deformation to adjust the gap between one end of the battery encapsulation area and the first end of the first slot, as well as the gap between the other end of the battery encapsulation area and the second end of the first slot.

[0007] Preferably, the first end of the first slot is provided with an inclined first groove, the second end of the first slot is provided with an inclined second groove, the first elastic block is installed in the first groove, and the second elastic block is installed in the second groove.

[0008] Preferably, both the first and second inclined grooves are inclined toward the center line of the first slot, and the first and second inclined grooves are symmetrically distributed along the center line of the first slot.

[0009] Preferably, the first slot includes a planar segment located in the middle and inclined segments respectively disposed on both sides of the planar segment. The first inclined slot and the second inclined slot are respectively disposed on the inclined segments on both sides of the planar segment. The first end and the second end of the cross-section of the battery packaging area are both inclined surfaces. The inclined segment at the first end of the first slot is parallel to the inclined surface at the first end of the cross-section of the battery packaging area. The inclined segment at the second end of the first slot is parallel to the inclined surface at the second end of the cross-section of the battery packaging area. Furthermore, the first end of the battery packaging area is in contact and pressed with the first elastic block, and the second end of the battery packaging area is in contact and pressed with the second elastic block.

[0010] Preferably, both the first elastic block and the second elastic block are made of silicon-aluminum composite plate.

[0011] This utility model also provides a top sealing structure for a battery, used to encapsulate a battery encapsulation area. The battery encapsulation area includes an aluminum-plastic film and tabs extending from the opening of the aluminum-plastic film, including an upper sealing head, a lower sealing head, a first elastic block, and a second elastic block. A first slot is formed on the lower sealing head, and a first elastic block and a second elastic block are respectively provided at the first end and the second end of the first slot. A second slot is formed on the upper sealing head, and a first elastic block and a second elastic block are respectively provided at the first end and the second end of the second slot. The upper sealing head and the lower sealing head cooperate with each other to press and encapsulate the battery encapsulation area. The upper surface of one end of the battery encapsulation area contacts and is pressed against the first elastic block in the second slot, and the lower surface contacts and is pressed against the first elastic block in the first slot. The upper surface of the other end of the battery encapsulation area contacts and is pressed against the second elastic block in the second slot, and the lower surface contacts and is pressed against the second elastic block in the first slot. The first elastic block and the second elastic block can undergo elastic deformation to adjust the gap between one end of the battery packaging area and the first end of the first slot and the first end of the second slot, as well as the gap between the other end of the battery packaging area and the second end of the first slot and the second end of the second slot.

[0012] This utility model also provides a battery, including an aluminum-plastic film, a core / stacked core, and tabs, and also includes the top sealing structure of the battery described above. The core / stacked core is located inside the perforation of the aluminum-plastic film. One end of the tab is connected to the core / stacked core, and the other end of the tab extends out from the opening of the encapsulation area of ​​the aluminum-plastic film. The inner surface of the aluminum-plastic film is provided with a second hot melt adhesive layer, and the outer surface of the tab is provided with a first hot melt adhesive layer. The assembled battery encapsulation area is placed in the first slot of the lower end cap, and the upper end cap presses the battery encapsulation area into the first slot to complete the encapsulation of the battery encapsulation area.

[0013] Preferably, the cross-section of the battery encapsulation area tab includes a rectangular portion in the middle and tapered portions on both sides of the rectangular portion, wherein the upper and lower sides of the tapered portion are both inclined surfaces.

[0014] Preferably, the thickness of the electrode tab is in the range of 0.6-1.0 mm.

[0015] Preferably, both the first hot melt adhesive layer and the second hot melt adhesive layer are made of CPP adhesive.

[0016] The top-sealing structure of this invention is suitable for top-sealing the encapsulation area of ​​a pouch battery and effectively solves the problem of misalignment between the battery encapsulation area and the center of the first slot in the top-sealing head during top-sealing of a pouch battery. The first and second ends of the first slot are provided with a first elastic block and a second elastic block. When one end of the battery encapsulation area is biased towards the first elastic block, the first elastic block is further compressed, thereby reserving a certain space between the aluminum-plastic film and the tab, preventing the hot melt adhesive between the aluminum-plastic film and the tab from being squeezed to a very thin state and losing its insulating function, thus preventing corrosion caused by short circuit between the aluminum layer of the aluminum-plastic film and the tab. At this time, there is a large gap between the other end of the battery encapsulation area and the second end of the first slot. The second elastic block will rebound to a certain extent to reduce the gap between the other end of the battery encapsulation area and the second end of the first slot, thereby ensuring that the hot melt adhesive between the aluminum-plastic film and the tab can fill the gap, thus ensuring that the tab and the aluminum-plastic film can be properly encapsulated, preventing leakage due to incomplete encapsulation. When the tab is biased towards the second elastic block, the principle is the same as described above. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a double-layer rectangular groove in the prior art;

[0018] Figure 2 This is a schematic diagram of the lower end cap of the top sealing structure of the battery in Embodiment 1 of this utility model. Figure 1 ;

[0019] Figure 3 This is a schematic diagram of the lower end cap of the top sealing structure of the battery in Embodiment 1 of this utility model. Figure 2 ;

[0020] Figure 4 This is a schematic diagram of the battery encapsulation area being centered in the first slot in the top sealing structure of the battery in Embodiment 1 of this utility model;

[0021] Figure 5 This is a schematic diagram of the battery encapsulation area biased towards the first elastic block in the top sealing structure of the battery in Embodiment 1 of this utility model;

[0022] Figure 6 This is a schematic diagram of the battery encapsulation area in the top sealing structure of the battery in Embodiment 2 of this utility model, with the first slot centered.

[0023] Figure 7 This is a schematic diagram of the battery encapsulation area biased towards the first elastic block in the top sealing structure of the battery in Embodiment 2 of this utility model;

[0024] Figure 8 This is a schematic diagram showing the positions of the tabs and aluminum-plastic film in the top sealing structure of the battery in Embodiment 3 of this utility model.

[0025] In the diagram: 100-Upper end cap, 200-Lower end cap, 300-First inclined groove, 310-Second inclined groove, 320-First elastic block, 330-Second elastic block, 400-Electric tab, 410-First hot melt adhesive layer, 500-Aluminum-plastic film, 510-Second hot melt adhesive layer, 600-First slot, 601-Flat section, 602-Inclined section, 610-Second slot, 800-Double-layer rectangular groove. Detailed Implementation

[0026] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "above" and other indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] This utility model provides a top sealing structure for a battery, used to encapsulate a battery encapsulation area. The battery encapsulation area includes an aluminum-plastic film and tabs extending from the opening of the aluminum-plastic film, and includes an upper end cap, a lower end cap, a first elastic block, and a second elastic block. The lower end cap has a first slot, and the first end and the second end of the first slot are respectively provided with a first elastic block and a second elastic block. The upper end cap presses the battery encapsulation area into the first slot, and one end of the battery encapsulation area contacts and is pressed against the first elastic block, while the other end of the battery encapsulation area contacts and is pressed against the second elastic block. The first elastic block and the second elastic block can undergo elastic deformation to adjust the gap between one end of the battery encapsulation area and the first end of the first slot, and the gap between the other end of the battery encapsulation area and the second end of the first slot.

[0031] This utility model also provides a top sealing structure for a battery, used to encapsulate a battery encapsulation area. The battery encapsulation area includes an aluminum-plastic film and tabs extending from the opening of the aluminum-plastic film, including an upper sealing head, a lower sealing head, a first elastic block, and a second elastic block. A first slot is formed on the lower sealing head, and a first elastic block and a second elastic block are respectively provided at the first end and the second end of the first slot. A second slot is formed on the upper sealing head, and a first elastic block and a second elastic block are respectively provided at the first end and the second end of the second slot. The upper sealing head and the lower sealing head cooperate with each other to press and encapsulate the battery encapsulation area. The upper surface of one end of the battery encapsulation area contacts and is pressed against the first elastic block in the second slot, and the lower surface contacts and is pressed against the first elastic block in the first slot. The upper surface of the other end of the battery encapsulation area contacts and is pressed against the second elastic block in the second slot, and the lower surface contacts and is pressed against the second elastic block in the first slot. The first elastic block and the second elastic block can undergo elastic deformation to adjust the gap between one end of the battery packaging area and the first end of the first slot and the first end of the second slot, as well as the gap between the other end of the battery packaging area and the second end of the first slot and the second end of the second slot.

[0032] This utility model also provides a battery, including an aluminum-plastic film, a core / stacked core, and tabs, and also includes the top sealing structure of the battery described above. The core / stacked core is located inside the perforation of the aluminum-plastic film. One end of the tab is connected to the core / stacked core, and the other end of the tab extends out from the opening of the encapsulation area of ​​the aluminum-plastic film. The inner surface of the aluminum-plastic film is provided with a second hot melt adhesive layer, and the outer surface of the tab is provided with a first hot melt adhesive layer. The assembled battery encapsulation area is placed in the first slot of the lower end cap, and the upper end cap presses the battery encapsulation area into the first slot to complete the encapsulation of the battery encapsulation area.

[0033] Example 1

[0034] like Figure 2 As shown, this embodiment discloses a top sealing structure for a battery, used to encapsulate a battery encapsulation area, which includes an aluminum-plastic film and tabs extending from the opening of the aluminum-plastic film. The top sealing structure includes an upper end cap, a lower end cap, a first elastic block 320, and a second elastic block 330. A first slot 600 is formed on the lower end cap, and the first end and the second end of the first slot 600 are respectively provided with the first elastic block 320 and the second elastic block 330. The upper end cap presses the battery encapsulation area into the first slot, and one end of the battery encapsulation area contacts and is pressed against the first elastic block 320, while the other end of the battery encapsulation area contacts and is pressed against the second elastic block 330. The first elastic block 320 and the second elastic block 330 can undergo elastic deformation to adjust the gap between one end of the battery encapsulation area and the first end of the first slot, and the gap between the other end of the battery encapsulation area and the second end of the first slot.

[0035] In this embodiment, the top sealing structure of the battery is used to top seal the pouch battery. Top sealing of the pouch battery refers to sealing the top of the pouch battery during battery assembly. In this step, the tab 400 (the metal sheet connecting the internal core / stack of the battery to the external circuit) is led out from the opening at the top of the aluminum-plastic film 500. The aluminum-plastic film 500 and the tab 400 (battery encapsulation area) are then placed in the first slot 600 of the lower sealing head. Through the pressing action and heating of the upper sealing head, the CPP adhesive on the outer surface of the tab 400 is bonded and fused with the CPP adhesive on the inner surface of the aluminum-plastic film 500, thereby bonding the tab 400 and the aluminum-plastic film 500 together and sealing the opening at the top of the aluminum-plastic film 500, thus completing the top sealing of the pouch battery.

[0036] Under normal circumstances, due to the influence of process tolerance error, the center of the battery packaging area will deviate from the center of the first slot 600, that is, one end of the battery packaging area will be biased towards the first slot 600.

[0037] In addition, because soft-pack lithium-ion batteries have large capacity (≥150Ah) and high rate performance (3~5C), the existing thickness of 0.3~0.4mm and tab 400 cannot meet the overcurrent requirements. The thickness of tab 400 needs to be increased to 0.6~1mm. With such a thick tab 400, when using ordinary top seal head for encapsulation, it is easy to cause encapsulation failure such as leakage or corrosion at the top seal position of the battery tab 400.

[0038] When the battery encapsulation area is placed in the first slot 600 (the upper end cap presses it tightly within the first slot 600), the first and second ends of the battery encapsulation area can respectively compress the first elastic block 320 and the second elastic block 330. When there is a deviation between the center of the battery encapsulation area and the center of the first slot 600, and one end of the battery encapsulation area is biased towards the first elastic block 320, the first elastic block 320 is further compressed, thereby reserving space for the aluminum-plastic film 500 and the tab 400 at that end, and avoiding excessive compression between the CPP adhesive on the inner surface of the aluminum-plastic film 500 and the CPP adhesive on the outer surface of the tab 400, which could lead to short circuit and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400. At this time, the gap between the other end of the tab 400 and the end (second end) where the second elastic block 330 of the first slot 600 is located will be too large, exceeding the standard. The CPP glue on the inner surface of the aluminum-plastic film 500 and the CPP glue on the outer surface of the tab 400 at this end will not be enough to fill the gap. However, since the second elastic block 330 is subjected to less pressure from the tab 400, the second elastic block 330 will rebound to reduce the gap between the tab 400 and the second end of the first slot 600, thereby applying pressure to the aluminum-plastic film 500 and the tab 400, ensuring that the aluminum-plastic film 500 and the tab 400 at this end can be effectively sealed.

[0039] Furthermore, when there is a deviation between the center of the battery encapsulation area and the center of the first slot 600, and the position of the battery encapsulation area is biased towards the second elastic block 330, the second elastic block 330 is further compressed, and the first elastic block 320 rebounds. The principle is similar to that when the battery encapsulation area is biased towards the first elastic block 320, and will not be elaborated here.

[0040] like Figure 2 , 3 As shown, the cross-section of the first slot 600 is an isosceles trapezoid. The bottom of the first slot 600 is a plane, and the two ends are provided with inclined surfaces connected to the bottom plane. The inclined surfaces are provided with a first inclined slot 300 and a second inclined slot 310. The first elastic block 320 is installed in the first inclined slot 300, and the second elastic block 330 is installed in the second inclined slot 310.

[0041] Specifically, the first inclined groove 300 and the second inclined groove 310 are both rectangular in shape, the first elastic block 320 is a rectangle that matches the shape of the first inclined groove 300, and the second elastic block 330 is a rectangle that matches the shape of the second inclined groove 310.

[0042] Furthermore, when not under pressure, the top of the first elastic block 320 extends partially from the first inclined groove 300, and the top of the second elastic block 330 extends partially from the second inclined groove 310. This structure helps to ensure that when the battery encapsulation area is installed in the first slot 600, the battery encapsulation area can contact and be compressed with the first elastic block 320 and the second elastic block 330.

[0043] like Figure 2 , 3 As shown, the first inclined groove 300 and the second inclined groove 310 are both inclined toward the center line of the first slot 600, and the first inclined groove 300 and the second inclined groove 310 are symmetrically distributed along the center line of the first slot 600. The first inclined groove 300 and the second inclined groove 310 are the same size and shape.

[0044] In this embodiment, the middle portion of the cross-section of the battery packaging area tab is rectangular, and both ends of the cross-section are tapered. Specifically, both the first and second ends of the tab 400 within the battery packaging area have inclined surfaces. The inclined surface of the first end of the tab 400 is parallel to the upper surface of the first elastic block 320, and the inclined surface of the second end of the tab 400 is parallel to the upper surface of the second elastic block 320. Furthermore, the inclined surfaces of the first and second ends of the tab 400 are in contact and pressed against the first and second elastic blocks 320. Further, the inclination angle of the first and second inclined grooves 300 is 8-12°, meaning the angle between the long side of the first and second inclined grooves 300 and the horizontal line is 8-12°. In this embodiment, the inclination angle is 10°. This inclination angle ensures parallelism with the inclined surface of the tab 400, thereby effectively transmitting pressure through contact with the tab 400.

[0045] Specifically, both the first elastic block 320 and the second elastic block 330 are made of silicon-aluminum composite plates. Silicon-aluminum composite plates are sheets made of aluminum and silicon, possessing excellent physical and chemical properties. They have good thermal conductivity and can transmit a certain amount of pressure, compressing by 0.2-0.5 mm under pressure. Furthermore, their good thermal conductivity aids in heat dissipation, ensuring uniform temperature during the encapsulation process; they can transmit pressure, ensuring uniform pressure distribution throughout the encapsulation process; and under pressure, they can compress by 0.2-0.5 mm, accommodating minor deviations in the tab 400 position and ensuring the reliability and sealing of the encapsulation. Of course, the first elastic block 320 and the second elastic block 330 can also be made of other materials.

[0046] like Figure 4As shown, the upper end cap 100 further includes a second slot 610 (the cross-section of the second slot 610 is an isosceles trapezoid with the same shape as the first slot 600). The upper end cap 100 cooperates with the lower end cap to press the battery encapsulation area into the space within the first and second slots. The lower surface of the first end of the battery encapsulation area contacts and is pressed against the first elastic block in the first slot, and the upper surface of the battery encapsulation area contacts the inclined surface of the first end in the second slot. The lower surface of the other end of the battery encapsulation area contacts and is pressed against the second elastic block in the first slot, and the upper surface of the other end contacts the inclined surface of the second end in the second slot.

[0047] Specifically, the outer surface of the tab 400 is coated with a first hot melt adhesive layer 410, the tab 400 extends from the top sealing opening of the aluminum-plastic film 500, and the inner surface of the aluminum-plastic film 500 is provided with a second hot melt adhesive layer 510. The first hot melt adhesive layer 410 and the second hot melt adhesive layer 510 fuse together under heating and the pressing action of the upper and lower sealing heads, thereby completing the heat sealing.

[0048] In this embodiment, both the first hot melt adhesive layer 410 and the second hot melt adhesive layer 510 are made of CPP adhesive (polypropylene adhesive). CPP adhesive is a hot melt adhesive with polypropylene as its main component. Polypropylene is a common thermoplastic with good chemical stability, heat resistance, solvent resistance, and mechanical strength. In the manufacturing process of soft-pack lithium-ion batteries, CPP adhesive is often used to bond and seal various materials, especially playing a key role in the connection between the tab 400 and the aluminum-plastic film 500. As a high-performance hot melt adhesive, CPP adhesive plays an important role in the manufacturing process of soft-pack lithium-ion batteries. Its chemical stability, heat resistance, mechanical strength, and rapid curing properties make it an indispensable material in battery encapsulation, ensuring the safety and reliability of the battery.

[0049] like Figure 4 As shown, when the center of the battery encapsulation area is aligned with the center of the first slot 600 and the second slot 610, that is, when the battery encapsulation area is neither biased towards the first elastic block 320 nor the second elastic block 330, the first elastic block 320 and the second elastic block 330 respectively contact the inclined edges at both ends of the battery encapsulation area and are subjected to the same compressive force, thereby producing the same amount of compression. At this time, the gaps between the two ends of the battery encapsulation area and the first slot 600 and the second slot 610 are both within the set range. The tab 400 and the aluminum-plastic film 500 will not be excessively compressed, causing the aluminum layer of the aluminum-plastic film 500 to short-circuit with the tab 400, nor will a large gap be generated between the battery encapsulation area and the first slot 600 and the second slot 610.

[0050] like Figure 5As shown, when the battery encapsulation area is biased towards the first elastic block 320, the bottom slope of one end of the battery encapsulation area continues to compress the first elastic block 320 downwards, thereby reserving space for the aluminum-plastic film 500 and the tab 400 at that end. This prevents excessive compression between the CPP adhesive on the inner surface of the aluminum-plastic film 500 and the CPP adhesive on the outer surface of the tab 400, which could lead to short circuits and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400. At this time, the bottom slope of the other end of the battery encapsulation area will create a large gap with the second end of the first slot 600. In this case, the second elastic block 330 will spring upwards, thereby providing sufficient clamping force between the aluminum-plastic film 500 and the tab 400, ensuring that the aluminum-plastic film 500 and the tab 400 on this side can be effectively encapsulated.

[0051] Similarly, when the battery encapsulation area is biased towards the second elastic block 330, the bottom slope of one end of the battery encapsulation area continues to compress the second elastic block 330 downwards, thereby reserving space for the aluminum-plastic film 500 and the tab 400 at that end. This prevents excessive compression between the CPP adhesive on the inner surface of the aluminum-plastic film 500 and the CPP adhesive on the outer surface of the tab 400, which could lead to short circuits and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400. At this time, the bottom slope of the other end of the battery encapsulation area will create a large gap with the first end of the first slot. In this case, the first elastic block 320 will bounce upwards, thereby providing sufficient clamping force between the aluminum-plastic film 500 and the tab 400, ensuring that the aluminum-plastic film 500 and the tab 400 on that side can be effectively encapsulated.

[0052] Specifically, both the upper end cap 100 and the lower end cap 200 are made of metal. Optionally, the upper end cap 100 and the lower end cap 200 may be made of aluminum alloy, stainless steel, or copper alloy. In this embodiment, the upper end cap 100 and the lower end cap 200 are made of stainless steel.

[0053] The top sealing structure of the battery in this embodiment effectively solves the problem of deviation between the center of the battery encapsulation area and the center of the first slot 600 of the top sealing head during the top sealing of a soft-pack battery. The first and second ends of the first slot 600 are provided with a first elastic block 320 and a second elastic block 330. When one end of the tab 400 is biased towards the first elastic block 320, the first elastic block 320 is further compressed, thereby reserving a certain space between the aluminum-plastic film 500 and the tab 400. This prevents the CPP adhesive between the aluminum-plastic film 500 and the tab 400 from being squeezed to a very thin state and losing its insulating function, thus preventing short circuits and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400. At this time, there is a large gap between the other end of the battery encapsulation area and the second end of the first slot 600. The second elastic block 330 will rebound to a certain extent to reduce the gap between the other end of the tab 400 and the second end of the first slot 600. The rebounding second elastic block 330 can apply pressure to the aluminum-plastic film 500 and the tab 400 on this side, thereby ensuring that the tab 400 and the aluminum-plastic film 500 can be properly encapsulated to prevent leakage due to incomplete encapsulation. When the battery encapsulation area is biased towards the second elastic block 330, the principle is the same as described above.

[0054] Example 2

[0055] This embodiment discloses a top sealing structure for a battery, used to encapsulate a battery encapsulation area. The battery encapsulation area includes an aluminum-plastic film and tabs extending from the opening of the aluminum-plastic film. The top sealing structure includes an upper sealing head 100, a lower sealing head 200, a first elastic block 320, and a second elastic block 330. A first slot 600 is formed on the lower sealing head, and a first elastic block 320 and a second elastic block 330 are respectively provided at the first and second ends of the first slot 600. A second slot is formed on the upper sealing head, and a first elastic block 320 and a second elastic block 330 are respectively provided at the first and second ends of the second slot. The upper and lower sealing heads cooperate with each other to press and encapsulate the battery encapsulation area. The upper surface of one end of the battery encapsulation area contacts and is pressed against the first elastic block 320 in the second slot, and the lower surface contacts and is pressed against the first elastic block in the first slot. The upper surface of the other end of the battery encapsulation area contacts and is pressed against the second elastic block in the second slot, and the lower surface contacts and is pressed against the second elastic block in the first slot. The first elastic block 320 and the second elastic block 330 can undergo elastic deformation to adjust the gap between one end of the battery encapsulation area and the first end of the first slot and the first end of the second slot, as well as the gap between the other end of the battery encapsulation area and the second end of the first slot and the second end of the second slot.

[0056] like Figure 6As shown, the upper end cap 100 is located above the lower end cap 200 and the two are symmetrical about their contact surfaces. The first slot 600 of the upper end cap 100 and the second slot of the lower end cap 200 are aligned. The inclined surface of the upper surface of one end of the battery encapsulation area contacts and presses against the first elastic block in the second slot, and the lower surface contacts and presses against the first elastic block in the first slot. The inclined surface of the upper surface of the other end of the battery encapsulation area contacts and presses against the second elastic block in the second slot, and the lower surface contacts and presses against the second elastic block in the first slot.

[0057] like Figure 7 As shown, when the battery encapsulation area is biased towards the first elastic block 320, the inclined surface of the upper surface of one end of the battery encapsulation area is further squeezed against the first elastic block 320 with the second slot, and the inclined surface of the lower surface is further squeezed against the first elastic block 320 with the first slot; thereby reserving space for this end of the battery encapsulation area, avoiding excessive compression between the first hot melt adhesive layer 410 on the outer surface of the tab 400 at this end and the second hot melt adhesive layer 510 on the inner surface of the aluminum-plastic film 500, which would cause short circuit and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400.

[0058] At this time, the inclined surfaces of the upper and lower surfaces at the other end of the battery encapsulation area create large gaps with the second end of the second slot and the second end of the first slot, respectively. Under these circumstances, the second elastic block 330 in the second slot of the upper end cap 100 and the second elastic block 330 in the second slot of the lower end cap 200 will both rebound upwards with a certain amount of compression, thereby providing sufficient clamping force between the aluminum-plastic film 500 and the tab 400, ensuring that the aluminum-plastic film 500 and the tab 400 on this side can be effectively encapsulated.

[0059] Similarly, when the battery encapsulation area is biased towards the second elastic block 330, the inclined surface of the upper surface of one end of the battery encapsulation area 400 is further squeezed by the second elastic block 320 with the second slot, and the inclined surface of the lower surface is further squeezed by the second elastic block 320 with the first slot; thereby reserving space for this end of the battery encapsulation area, avoiding excessive compression between the first hot melt adhesive layer 410 on the outer surface of the tab 400 at this end and the second hot melt adhesive layer 510 on the inner surface of the aluminum-plastic film 500, which would cause short circuit and corrosion between the aluminum layer of the aluminum-plastic film 500 and the tab 400.

[0060] At this time, the inclined surfaces of the upper and lower surfaces at the other end of the battery encapsulation area create large gaps with the first end of the second slot and the first end of the first slot, respectively. Under these circumstances, the first elastic block in the second slot of the upper end cap 100 and the first elastic block in the first slot of the lower end cap 200 will both rebound upwards with a certain amount of compression, thereby providing sufficient clamping force between the aluminum-plastic film 500 and the tab 400, ensuring that the aluminum-plastic film 500 and the tab 400 on this side can be effectively encapsulated.

[0061] The top sealing structure of the battery in this embodiment is suitable for the top sealing of the thick tab 400 of the soft-pack battery, and can effectively solve the problem of deviation between the battery encapsulation area and the center of the top sealing head groove during encapsulation. When one end of the battery encapsulation area is biased towards the first elastic block, the first elastic block 320 set in the first inclined groove 300 will be further compressed, thereby generating a large amount of compression, thus ensuring that the second hot melt adhesive layer 510 on the inner surface of the aluminum-plastic film 500 and the first hot melt adhesive layer 410 on the outer surface of the tab 400 will not be excessively squeezed, so that there is sufficient hot melt adhesive insulation between the aluminum layer of the aluminum-plastic film 500 and the metal part of the tab 400, thereby avoiding the situation where the aluminum layer of the aluminum-plastic film 500 comes into contact with the metal part of the tab 400 and a short circuit occurs.

[0062] At this time, the gap between the other side of the battery encapsulation area and the second end of the first slot of the lower end cap 200 and the second end of the second slot of the upper end cap is large, and the pressure on the second elastic block 330 is small, so it bulges outward, maintains a small amount of compression, and can transfer a certain pressure to the hot melt adhesive between the aluminum-plastic film 500 and the tab 400, thereby completing normal encapsulation to prevent leakage caused by leaked encapsulation.

[0063] Therefore, this top sealing structure can effectively solve the problem of encapsulation failure, such as leakage or corrosion, caused by the deviation of the center of the battery encapsulation area from the center of the slot on the top end during the encapsulation process of thick tab 400.

[0064] Example 3

[0065] This embodiment discloses a battery, including an aluminum-plastic film 500, a core / stacked core, and tabs 400. It also includes the top sealing structure of the battery in Embodiment 1 or Embodiment 2. The core / stacked core is located inside the perforation of the aluminum-plastic film 500. One end of the tab 400 is electrically connected to the core / stacked core, and the other end of the tab 400 extends out from the opening of the encapsulation area of ​​the aluminum-plastic film 500. The inner surface of the aluminum-plastic film 500 is provided with a second hot melt adhesive layer 510, and the outer surface of the tab 400 is provided with a first hot melt adhesive layer 410. The assembled battery encapsulation area is placed in the first slot 600 of the lower end cap 200, and the upper end cap 100 presses the battery encapsulation area into the first slot to complete the encapsulation of the battery encapsulation area.

[0066] like Figure 8 As shown, specifically, the aluminum-plastic film 500 is bonded to the upper part and the lower part of the tab 400 from both the top and bottom directions to complete the encapsulation. The upper end cap 100 is used to press the upper aluminum-plastic film 500 against the upper part of the tab 400, and the lower end cap 200 is used to press the lower aluminum-plastic film 500 against the lower part of the tab 400. The first hot melt adhesive layer 410 and the second hot melt adhesive layer 510 fuse together under heating and the pressing action of the upper and lower end caps, thereby completing the heat sealing.

[0067] Furthermore, in this embodiment, the tab 400 is a thick tab with a thickness ranging from 0.6 to 1.0 mm.

[0068] In this embodiment, the cross-section of the battery packaging area tab includes a rectangular portion in the middle and tapered portions on both sides of the rectangular portion, with both the upper and lower sides of the tapered portion being inclined surfaces.

[0069] The pouch battery in this embodiment can be fitted with thicker tabs 400, which effectively improves current carrying capacity, enhances overcurrent requirements, and better disperses heat, thereby improving the battery's thermal stability. Furthermore, the top-sealing structure effectively solves the problem of leakage or corrosion at the top-sealing position caused by the center of the battery packaging area with thick tabs 400 deviating from the center of the end cap groove during the packaging process.

[0070] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A top sealing structure for a battery, used to encapsulate a battery encapsulation area, said battery encapsulation area comprising an aluminum-plastic film and tabs extending from an opening in the aluminum-plastic film, characterized in that, It includes an upper end cap, a lower end cap, a first elastic block (320), and a second elastic block (330); The lower end cap has a first slot (600), and a first elastic block (320) and a second elastic block (330) are respectively provided at the first end and the second end of the first slot (600). The upper end cap presses the battery encapsulation area into the first slot (600), and one end of the battery encapsulation area contacts and is pressed against the first elastic block (320), while the other end of the battery encapsulation area contacts and is pressed against the second elastic block (330). The first elastic block (320) and the second elastic block (330) can undergo elastic deformation to adjust the gap between one end of the battery packaging area and the first end of the first slot, as well as the gap between the other end of the battery packaging area and the second end of the first slot.

2. The top sealing structure of the battery according to claim 1, characterized in that, The first end of the first slot (600) is provided with an inclined first groove (300), the second end of the first slot is provided with an inclined second groove (310), the first elastic block (320) is installed in the first groove (300), and the second elastic block (330) is installed in the second groove (310).

3. The top sealing structure of the battery according to claim 2, characterized in that, The first inclined groove (300) and the second inclined groove (310) are both inclined toward the center line of the first slot (600), and the first inclined groove (300) and the second inclined groove (310) are symmetrically distributed along the center line of the first slot (600).

4. The top sealing structure of the battery according to claim 3, characterized in that, The first slot (600) includes a planar segment in the middle and inclined segments respectively disposed on both sides of the planar segment. The first inclined slot (300) and the second inclined slot (310) are respectively disposed on the inclined segments on both sides of the planar segment. Both the first and second ends of the cross-section of the battery encapsulation region are inclined surfaces. The inclined section at the first end of the first slot (600) is parallel to the inclined surface at the first end of the cross-section of the battery encapsulation region, and the inclined section at the second end of the first slot (600) is parallel to the inclined surface at the second end of the cross-section of the battery encapsulation region. Furthermore, the first end of the battery encapsulation area contacts and is pressed against the first elastic block, and the second end of the battery encapsulation area contacts and is pressed against the second elastic block.

5. The top sealing structure of the battery according to claim 1, characterized in that, Both the first elastic block (320) and the second elastic block (330) are made of silicon-aluminum composite plate.

6. A top sealing structure for a battery, used to encapsulate a battery encapsulation area, said battery encapsulation area comprising an aluminum-plastic film and tabs extending from an opening in the aluminum-plastic film, characterized in that, It includes an upper end cap, a lower end cap, a first elastic block (320), and a second elastic block (330); The lower end cap is provided with a first slot (600), and a first elastic block (320) and a second elastic block (330) are respectively provided at the first end and the second end of the first slot (600). The upper end cap is provided with a second slot, and a first elastic block (320) and a second elastic block (330) are respectively provided at the first end and the second end of the second slot. The upper and lower end caps cooperate to compress and seal the battery encapsulation area. Furthermore, the upper surface of one end of the battery encapsulation area contacts and presses against the first elastic block (320) in the second slot, and the lower surface contacts and presses against the first elastic block in the first slot; the upper surface of the other end of the battery encapsulation area contacts and presses against the second elastic block in the second slot, and the lower surface contacts and presses against the second elastic block in the first slot. The first elastic block (320) and the second elastic block (330) can undergo elastic deformation to adjust the gap between one end of the battery encapsulation area and the first end of the first slot and the first end of the second slot, as well as the gap between the other end of the battery encapsulation area and the second end of the first slot and the second end of the second slot.

7. A battery comprising an aluminum-plastic film (500), a coil / stacked core, and tabs (400), characterized in that, It also includes the top sealing structure of the battery as described in claim 1 or 6, wherein the core / stack is located inside the perforation of the aluminum-plastic film (500), one end of the tab (400) is connected to the core / stack, and the other end of the tab (400) extends from the opening of the encapsulation area of ​​the aluminum-plastic film (500). The inner surface of the aluminum-plastic film (500) is provided with a second hot melt adhesive layer (510), and the outer surface of the tab (400) is provided with a first hot melt adhesive layer (410). The assembled battery encapsulation area is placed in the first slot (600) of the lower end cap (200), and the upper end cap (100) presses the battery encapsulation area into the first slot to complete the encapsulation of the battery encapsulation area.

8. The battery according to claim 7, characterized in that, The cross-section of the battery packaging area tab includes a rectangular portion in the middle and tapered portions on both sides of the rectangular portion, with both the upper and lower sides of the tapered portion being inclined surfaces.

9. The battery according to claim 7, characterized in that, The thickness of the tab (400) ranges from 0.6 to 1.0 mm.

10. The battery according to claim 7, characterized in that, Both the first hot melt adhesive layer and the second hot melt adhesive layer are made of CPP adhesive.

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