A lithium battery heat sealing mechanism

Abstract

The utility model discloses a kind of lithium battery heat sealing mechanism, including lower mounting plate, upper mounting plate and two side mounting plates, the upper surface both sides of lower mounting plate are fixedly connected with side mounting plate, the top of two side mounting plates is fixedly connected with the bottom surface of upper mounting plate by bolt, driving assembly is set on lower mounting plate and upper mounting plate, and driving assembly includes upper pneumatic cylinder, lower pneumatic cylinder, floating joint, guide sleeve and guide rod, the upper surface of upper mounting plate and the bottom end of lower mounting plate are respectively fixedly installed with upper pneumatic cylinder and lower pneumatic cylinder, the utility model is equipped with a floating joint between the cylinder group and connecting plate, so that the mechanism upper heat sealing head or lower heat sealing head can carry out multi-degree-of-freedom leveling in pressing process, to ensure that heat sealing head and battery surface evenly contact, pressure distribution is consistent, ensure that the stress of entire sealing edge line is uniform, avoid the uneven pressure phenomenon when sealing edge, to improve battery production efficiency and production quality.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing equipment technology, specifically a lithium battery heat sealing mechanism. Background Technology

[0002] Lithium-ion batteries are rechargeable batteries that use materials such as graphite as the negative electrode and a lithium salt solution as the electrolyte. Their working principle involves the movement of lithium ions between the positive and negative electrodes to store and release energy. These batteries are characterized by high energy density and long lifespan, and are widely used in portable electronic devices and other fields. During the assembly process, the aluminum-plastic encapsulation film needs to be heated and sealed to form a sealed battery cell. The quality of this heat-sealing process directly affects the battery's sealing performance, safety, and lifespan.

[0003] Currently, commonly used heat sealing mechanisms typically employ the method of pressing the upper and lower heat sealing heads together. However, existing heat sealing mechanisms have some shortcomings: 1. Uneven pressure: When heat-sealing large-area batteries, traditional mechanisms are prone to insufficient or excessive local pressure on the sealing edge due to errors in the flatness of the heat sealing head or asynchronous drive mechanism, resulting in incomplete or over-sealing.

[0004] 2. Poor adaptability: When changing to batteries of different models or sizes, the entire heat-sealing mold needs to be replaced or significantly adjusted, which is complicated, time-consuming and labor-intensive.

[0005] Therefore, there is an urgent need for a new type of lithium battery heat sealing mechanism that features uniform sealing pressure, high thermal efficiency, and easy and quick model changeover. Utility Model Content

[0006] The purpose of this invention is to provide a lithium battery heat sealing mechanism to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery heat sealing mechanism, comprising a lower mounting plate, an upper mounting plate, and two side mounting plates, characterized in that side mounting plates are fixedly connected to both sides of the upper surface of the lower mounting plate, and the tops of the two side mounting plates are fixedly connected to the bottom surface of the upper mounting plate by bolts. A driving assembly is provided on both the lower and upper mounting plates, and the driving assembly includes an upper pneumatic cylinder, a lower pneumatic cylinder, a floating joint, a guide sleeve, and a guide rod. The upper and lower pneumatic cylinders are fixedly mounted on the upper surface of the upper mounting plate and the bottom of the lower mounting plate, respectively. The output rods of the upper and lower pneumatic cylinders pass through the middle of the lower and upper mounting plates and are fixedly connected to the floating joint. One end of the floating joint is connected to a fixed plate. Guide rods are fixedly connected to both ends of one side of the fixed plate. The guide rods pass through the upper mounting plate, and guide sleeves are fitted onto the lower surface of each guide rod.

[0008] As a preferred embodiment of this utility model, a heat insulation plate is fixedly installed on the side of the fixing plate away from the guide rod, and a heating element is fixedly connected to one side of the heat insulation plate.

[0009] As a preferred embodiment of this utility model, a heating tube is installed in the heating element, and a heat seal head is detachably installed on the outer wall of the end of the heating element away from the heat insulation plate by bolts.

[0010] As a preferred embodiment of this utility model, the upper and lower pneumatic cylinders are arranged opposite to each other and have the same structure.

[0011] As a preferred technical solution of this utility model, the side mounting plate is configured with a "C" shaped structure.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model features a floating joint between the cylinder assembly and the connecting plate, allowing the upper or lower heat sealing head to be leveled with multiple degrees of freedom during the pressing process. This ensures uniform contact between the heat sealing head and the battery surface, consistent pressure distribution, and uniform stress on the entire sealing line, preventing uneven pressure during sealing and thus improving battery production efficiency and quality. Meanwhile, by setting the upper and lower heat sealing heads as detachable quick-change types, it is possible to customize the sealing edge contours according to different battery models. The fastening method is bolted to achieve quick change-up, which greatly reduces change-up time and cost, making it very suitable for flexible production of multiple varieties and small batches. By using guide rods, guide sleeves, and floating joints, the guide rods on both sides slide within the guide sleeves during operation of the cylinder assembly, thereby fixing and limiting the fixed plate and further improving the quality of battery heat sealing. This allows for a good balance between the upper and lower air cylinders in the battery pressing and heat sealing process, thus improving the battery heat sealing quality. The floating joints automatically compensate for flatness errors in the battery itself or during installation, ensuring uniform stress on the entire sealing line, effectively avoiding defects such as incomplete sealing and false sealing, and significantly improving the sealing reliability of the battery. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a frontal planar structural diagram of an embodiment of the present utility model; Figure 3 This is a side view of an embodiment of the present invention.

[0014] In the diagram: 1. Lower mounting plate; 2. Side mounting plate; 3. Upper mounting plate; 4. Floating joint; 5. Guide sleeve; 6. Guide rod; 7. Fixing plate; 8. Heat insulation plate; 9. Heating element; 10. Heating tube; 11. Heat sealing head; 12. Lower pneumatic cylinder; 13. Upper pneumatic cylinder. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-3 This utility model provides a technical solution: a lithium battery heat sealing mechanism, including a lower mounting plate 1, an upper mounting plate 3 and two side mounting plates 2. The upper surface of the lower mounting plate 1 is fixedly connected to both sides of the side mounting plates 2. The top of the two side mounting plates 2 is fixedly connected to the bottom surface of the upper mounting plate 3 by bolts. The lower mounting plate 1 and the upper mounting plate 3 are both provided with driving components, and the driving components include an upper air cylinder 13, a lower air cylinder 12, a floating joint 4, a guide sleeve 5 and a guide rod 6. The upper air cylinder 13 and the lower air cylinder 12 are fixedly installed on the upper surface of the upper mounting plate 3 and the bottom end of the lower mounting plate 1, respectively. The output rods of the upper air cylinder 13 and the lower air cylinder 12 pass through the middle of the lower mounting plate 1 and the upper mounting plate 3 and are fixedly connected to the floating joint 4. The floating joint 4 provided in this embodiment can automatically compensate for the flatness error of the battery itself or its installation, ensuring that the entire sealing line is subjected to uniform force and effectively avoiding defects such as incomplete sealing and false sealing. In this structure, the cylinder floating joint is a mature existing technology product that can be obtained directly by purchase without any creative effort. The cylinder floating joint is a connecting component in the pneumatic system, mainly used to compensate for assembly errors, absorb vibration and shock, reduce stress concentration, and ensure efficient collaborative work between the cylinder and the actuator. Its working principle is to achieve automatic self-alignment through spherical pairs or elastic elements, allowing a certain range of offset or angular adjustment between the piston rod and the driven part, thereby eliminating installation errors and vibration problems during operation. Since it is a mature existing technology product and is widely used, this manual will not describe it in detail.

[0017] One end of the floating joint 4 is connected to a fixing plate 7. Both ends of one side of the fixing plate 7 are fixedly connected to guide rods 6. The guide rods 6 pass through the upper mounting plate 3, and the lower end surface of the guide rods 6 is fitted with guide sleeves 5. This structural design allows the guide rods 6 on both sides of the cylinder assembly to slide back and forth within the guide sleeve 5 during operation, maintaining a vertical displacement effect, avoiding displacement deviation, and ensuring the straightness of the displacement. This, in turn, limits the movement of the fixing plate 7, further improving the quality of the battery heat sealing process. It also allows the upper and lower pneumatic cylinders to play a good balancing role in the battery pressing and heat sealing process, thereby improving the quality of battery heat sealing, avoiding tilting problems caused by displacement deviation, and improving the uniformity of heating.

[0018] In this embodiment, a heat insulation plate 8 is fixedly installed on the side of the fixing plate 7 away from the guide rod 6, and a heating element 9 is fixedly connected to one side of the heat insulation plate 8; With this structural design, the present invention can heat the heating element 9 through the heating tube 10, thereby heating the heat sealing head 11 through the high temperature of the heating element 9, thus meeting the temperature conditions for subsequent heat sealing. The heat insulation plate 8 can effectively insulate against heat, preventing heat from being transferred to the connecting block 6 and reducing the impact of heat.

[0019] In this embodiment, a heating tube 10 is installed inside the heating element 9. A heat sealing head 11 is detachably installed on the outer wall of the end of the heating element 9 away from the heat insulation plate 8 by bolts. The heat sealing head 11 can perform heat sealing treatment on the battery after heating to ensure normal heat sealing effect. The upper and lower heat-sealing heads are designed to be detachable and quick-change, allowing for customization based on the sealing contours of different battery models. This enables rapid changeovers and significantly reduces changeover time and costs.

[0020] In this embodiment, the upper pneumatic cylinder 13 and the lower pneumatic cylinder 12 are arranged opposite to each other and have the same structure.

[0021] In this embodiment, the side mounting plate 2 is configured with a "C" shaped structure.

[0022] In use, the lithium battery to be sealed is placed between the upper and lower heat sealing heads of this device. The device is started, and the output ends of the upper air cylinder 13 and the lower air cylinder 12 work simultaneously, driving the two sealing heads to move relative to each other (i.e., moving away from or closer to each other). At the same time, the guide rods 6 on both sides of the upper mounting plate 3 and the lower mounting plate 1 move vertically up and down in the guide sleeve 5, thereby achieving a limiting effect. This makes the upper and lower heat sealing heads 11 more stable during operation, further improving the quality of battery heat sealing. The upper air cylinder 13 and the lower air cylinder 12 can achieve a good balance in the heat sealing process of the battery, thereby improving the quality of battery heat sealing. The floating joint 4 can automatically compensate for the flatness error of the battery itself or the installation, ensuring that the entire sealing line is subjected to uniform force, effectively avoiding defects such as incomplete sealing and false sealing, and significantly improving the sealing reliability of the battery. When the output rods of the upper pneumatic cylinder 13 and the lower pneumatic cylinder 12 extend, they drive the two fixed plates 7 to move relative to each other through the output ends, thereby driving the two heat sealing heads 11 to move closer to each other and press the battery to be processed, thus realizing the heat sealing work of the battery between the upper and lower heat sealing heads. When the lithium battery heat sealing mechanism of this utility model is in use, the heating tube 10 can be used for heating. When the heating tube 10 is heating, it can synchronously heat the external heating element 9 and the heat sealing head 11, thereby providing a certain high temperature condition for the subsequent lithium battery edge sealing heat sealing.

[0023] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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.

[0024] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium battery heat sealing mechanism, comprising a lower mounting plate (1), an upper mounting plate (3), and two side mounting plates (2), characterized in that, Side mounting plates (2) are fixedly connected to both sides of the upper surface of the lower mounting plate (1). The tops of the two side mounting plates (2) are fixedly connected to the bottom surface of the upper mounting plate (3) by bolts. Both the lower mounting plate (1) and the upper mounting plate (3) are provided with driving components, and the driving components include an upper pneumatic cylinder (13), a lower pneumatic cylinder (12), a floating joint (4), a guide sleeve (5), and a guide rod (6). The upper surface of the upper mounting plate (3) and the bottom end of the lower mounting plate (1) are respectively fixedly installed with... The upper pneumatic cylinder (13) and the lower pneumatic cylinder (12) are provided. The output rods of the upper pneumatic cylinder (13) and the lower pneumatic cylinder (12) pass through the middle of the lower mounting plate (1) and the upper mounting plate (3) respectively and are fixedly connected to a floating joint (4). One end of the floating joint (4) is connected to a fixed plate (7). Both ends of one side of the fixed plate (7) are fixedly connected to guide rods (6). The guide rods (6) pass through the upper mounting plate (3) and the lower end surface of the guide rods (6) is fitted with guide sleeves (5).

2. The lithium battery heat sealing mechanism according to claim 1, characterized in that: A heat insulation plate (8) is fixedly installed on the side of the fixed plate (7) away from the guide rod (6), and a heating element (9) is fixedly connected to one side of the heat insulation plate (8).

3. The lithium battery heat sealing mechanism according to claim 2, characterized in that: A heating tube (10) is installed inside the heating element (9), and a heat seal head (11) is detachably installed on the outer wall of the end of the heating element (9) away from the heat insulation plate (8) by bolts.

4. The lithium battery heat sealing mechanism according to claim 1, characterized in that: The upper pneumatic cylinder (13) and the lower pneumatic cylinder (12) are arranged opposite to each other and have the same structure.

5. A lithium battery heat sealing mechanism according to claim 4, characterized in that: The side mounting plate (2) is configured with a "C" shape.

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