Lithium battery formation clamp

Abstract

The utility model relates to a lithium battery formation clamp and belongs to the technical field of lithium battery processing. The device mainly comprises a supporting frame, a limiting plate, a side plate, a movable door, a guide rod, a partition plate, a connecting plate, a pressurizing mechanism, a pressure sensor and a controller. According to the clamp, pressure is applied to the battery through the pressurizing mechanism, so that uniform pressure distribution on the surface of the battery can be ensured, and the contact effect of a positive plate and a negative plate of the battery and a diaphragm can be improved, so that the formation of an SEI (Solid Electrolyte Interphase) film and gas discharge are improved, and the battery performance is improved; the clamp is provided with the pressure sensor and the controller, the pressure applied to the battery can be monitored and adjusted in real time, a user can set a proper pressure value according to specific requirements so as to meet the formation requirements of batteries of different types and specifications, and the applicability and flexibility of the clamp are improved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery processing technology, specifically relating to a lithium battery formation fixture. Background Technology

[0002] Currently, most lithium-ion batteries use silicon-carbon anodes, which are prone to gas generation and volume expansion during the formation process. Especially when there is a lot of gas generation, the gas enters between the electrode and the separator, resulting in a decrease in the contact between the electrode and the separator and an increase in the internal resistance of the battery. Therefore, during the formation process of soft-pack lithium-ion batteries, it is necessary to use clamps to pressurize the battery, suppress gas from entering between the electrode or between the electrode and the separator, increase the adhesion between the electrode and the separator, and reduce the internal resistance of the battery to a certain extent. In addition, by applying a certain pressure, the expansion of the anode can be suppressed to a certain extent.

[0003] Existing plate clamping methods apply limited force to the battery surface, easily leading to uneven force distribution on the flat surface of the pouch lithium-ion battery. Insufficient pressure in the center of the battery affects the contact between the positive and negative electrodes and the separator in certain areas, thus impacting SEI film formation and gas release during capacity testing. Some clamps suitable for experimental production can only pressurize the battery but cannot control the pressure magnitude or specify a precise pressure value. Utility Model Content

[0004] To overcome the problem that existing plate clamping methods often result in uneven force distribution on the surface of pouch lithium-ion batteries, and insufficient pressure in the center of the battery, which affects the contact between the positive and negative electrodes and the separator in certain areas of the pouch lithium-ion battery, thus affecting the formation of the SEI film and the gas expulsion during the formation and capacity testing of the pouch lithium-ion battery. Some clamps suitable for experimental production can only pressurize the battery but cannot control the pressure magnitude or determine the specific pressure value. This invention provides a lithium battery formation clamp; this clamp applies pressure to the battery through a pressurizing mechanism, ensuring a uniform pressure distribution on the battery surface, which helps improve the contact between the positive and negative electrodes and the separator, thereby improving SEI film formation and gas expulsion, and enhancing battery performance. This clamp is equipped with a pressure sensor and controller, which can monitor and adjust the pressure applied to the battery in real time.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A lithium battery formation fixture mainly includes a support frame, limiting plates, side plates, a movable door, guide rods, partitions, connecting plates, a pressurizing mechanism, a pressure sensor, and a controller. The three limiting plates are installed on the support frame, the side plates are installed at the ends of the support frame, and the movable door is detachably installed on the support frame. The limiting plates, side plates, and movable door constitute a compression box, the interior of which is set as a cavity structure. Four guide rods are installed on the side plates, located inside the compression box. A partition for separating the batteries is slidably installed on the guide rods. The connecting plate is installed on the support frame, the pressurizing mechanism is installed on the connecting plate, located on one side of the compression box and partitions, the pressure sensor is installed on the side plate, and the controller is installed at the top of the support frame. The pressurizing mechanism, pressure sensor, and controller are electrically connected.

[0006] The pressurizing mechanism includes a hydraulic cylinder, a push plate, a slide rod, and a limit block. The hydraulic cylinder is mounted on a connecting plate, the push plate is connected to the piston rod of the hydraulic cylinder, and two slide rods are slidably mounted on the connecting plate, located on both sides of the hydraulic cylinder. The push plate is connected to the slide rod, the limit block is mounted on the end of the slide rod, and the hydraulic cylinder is electrically connected to the controller.

[0007] The push plate is provided with a circular hole to facilitate the passage of four guide rods, and the diameter of the circular hole is larger than the diameter of the guide rod.

[0008] The four guide rods are arranged in a rectangular pattern.

[0009] The pressure sensor is installed in the center of the side panel.

[0010] The aforementioned partition consists of multiple parts.

[0011] The beneficial effects of this utility model are:

[0012] This clamp applies pressure to the battery through a pressurizing mechanism, ensuring a uniform pressure distribution on the battery surface. This helps improve the contact between the positive and negative electrodes and the separator, thereby improving SEI film formation and gas expulsion, and enhancing battery performance. Unlike some clamps that can only apply pressure but cannot control the pressure, this clamp is equipped with a pressure sensor and controller, which can monitor and adjust the pressure applied to the battery in real time. Users can set appropriate pressure values ​​according to specific needs to meet the formation requirements of different types and specifications of batteries, improving the applicability and flexibility of the clamp. Attached Figure Description

[0013] Figure 1 This is an isometric schematic diagram of the present invention.

[0014] Figure 2 This is a top view of the structure of this utility model.

[0015] Figure 3This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of this utility model viewed from below.

[0017] Figure 5 This is a partial cross-sectional view of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0019] This utility model discloses a lithium battery formation fixture, which mainly includes a support frame 1, a limiting plate 2, a side plate 3, a movable door 4, a guide rod 5, a partition 6, a connecting plate 7, a pressurizing mechanism 8, a pressure sensor 9, and a controller 10. The three limiting plates 2 are installed on the support frame 1, the side plate 3 is installed at the end of the support frame 1, and the movable door 4 is detachably installed on the support frame 1. The limiting plate 2, the side plate 3, and the movable door 4 constitute a compression box 11. The compression box 11 has a hollow structure inside. Four guide rods 5 are installed on the side plate 3 and located inside the compression box 11. The partition 6, which is used to separate the batteries, is slidably installed on the guide rods 5. The connecting plate 7 is installed on the support frame 1, the pressurizing mechanism 8 is installed on the connecting plate 7 and located on one side of the compression box 11 and the partition 6, the pressure sensor 9 is installed on the side plate 3, and the controller 10 is installed at the top of the support frame 1. The pressurizing mechanism 8, the pressure sensor 9, and the controller 10 are electrically connected.

[0020] The lithium batteries to be processed are placed into the extrusion chamber 11. Separators 6 are used to separate the batteries as needed. The movable door 4 is closed. The required pressure value is set via the controller 10. The controller 10 activates the hydraulic cylinder 81. The piston rod of the hydraulic cylinder 81 pushes the push plate 82 towards the extrusion chamber 11. The push plate 82 moves smoothly forward under the guidance of the slide rod 83. Simultaneously, the limit block 84 on the slide rod 83 restricts the movement range of the push plate 82 to prevent excessive pressure. The push plate 82 contacts the battery and applies pressure. The pressure sensor 9 monitors the pressure in real time and transmits the data to the controller 10. The controller 10 compares the feedback data from the pressure sensor 9 with the set pressure value. If the actual pressure... If the pressure is less than the set value, the controller 10 will increase the output force of the hydraulic cylinder 81, causing the push plate 82 to continue applying pressure until the set value is reached. If the actual pressure is greater than the set value, the controller 10 will reduce the output force of the hydraulic cylinder 81, causing the push plate 82 to release some pressure until the pressure reaches the set value. Under pressurized conditions, pressure can be applied evenly to all parts of the battery, avoiding the problem of insufficient pressure in the middle of the battery. This improves the contact uniformity between the electrode and the separator on the entire soft-pack lithium-ion battery plane, which helps to form the SEI film uniformly. It can effectively suppress gas from entering between the electrode or between the electrode and the separator, increase the adhesion between the electrode and the separator, and thus improve the battery performance.

[0021] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the pressurizing mechanism 8 includes a hydraulic cylinder 81, a push plate 82, a slide rod 83, and a limiting block 84. The hydraulic cylinder 81 is mounted on the connecting plate 7. The push plate 82 is connected to the piston rod of the hydraulic cylinder 81. Two slide rods 83 pass through the connecting plate 7 and are slidably mounted on the connecting plate 7, located on both sides of the hydraulic cylinder 81. The push plate 82 is connected to the slide rod 83. The limiting block 84 is mounted on the end of the slide rod 83. The hydraulic cylinder 81 is electrically connected to the controller 10.

[0022] like Figure 2 , Figure 3 , Figure 4 As shown, the push plate 82 is provided with a circular hole 821 for the four guide rods 5 to pass through. The diameter of the circular hole 821 is larger than the diameter of the guide rods 5. This helps the guide rods 5 to accurately guide the movement direction of the push plate 82. During operation, the push plate 82 can move stably along the guide rods 5, reducing the possibility of lateral deviation and thus ensuring the accuracy of applying pressure to the lithium battery.

[0023] like Figure 1 , Figure 3 , Figure 5 As shown, the four guide rods 5 are arranged in a rectangular pattern; they serve to position the battery.

[0024] like Figure 5 As shown, the pressure sensor 9 is installed in the center of the side plate 3; the central position can avoid measurement errors caused by edge effects and other factors, so that the controller 10 can accurately adjust the pressure of the hydraulic cylinder 81 according to the information fed back by the pressure sensor 9, thereby ensuring that the lithium battery is formed under a suitable pressure environment.

[0025] The separator 6 is provided in multiple pieces; the multiple separators are beneficial for separating multiple lithium batteries. When multiple lithium batteries can be processed simultaneously in one fixture, the separator 6 can prevent mutual interference between batteries, such as preventing short circuits that may occur between adjacent batteries. At the same time, the separator 6 also helps to keep the physical and electrochemical environment around each battery relatively independent, so that each battery can be better processed during the formation process, thereby improving the batch processing capacity and effect of lithium battery formation.

[0026] Work process:

[0027] First, open the movable door 4 installed on the support frame 1 to expose the cavity structure inside the extrusion box 11, which consists of three limiting plates 2, side plates 3, and the movable door 4. This facilitates the placement of the lithium batteries to be formed. Place the lithium batteries one by one into the extrusion box 11. Four rectangular guide rods 5, installed on the side plates 3 and located inside the extrusion box 11, position the batteries. Multiple partitions 6, which are slidably installed on the guide rods 5, separate the batteries, ensuring that they are neatly arranged in the extrusion box 11 and preventing damage from mutual squeezing and collision. After the batteries are placed, close the movable door 4 to create a closed space in the extrusion box 11, ensuring the subsequent pressure application. To ensure process stability, according to the requirements of lithium battery formation technology, the operator sets a suitable pressure value on the controller 10. The controller 10 is located at the top of the support frame 1 and controls the entire clamping pressure system. The pressurizing mechanism 8, mounted on the connecting plate 7, starts working. After receiving the command from the controller 10, the piston rod of the hydraulic cylinder 81 in the pressurizing mechanism 8 begins to extend. The piston rod is connected to the push plate 82. When the piston rod extends, the push plate 82 begins to move towards the battery. The slide rods 83 connected to both sides of the push plate 82 are slidably mounted on the connecting plate 7. The push plate 82 moves forward smoothly under the guidance of the slide rods 83, while the limiting block 84 on the slide rod 83 restricts the push plate 82. To prevent excessive pressure, the push plate 82 has a circular hole 821 with a diameter larger than that of the guide rod 5, allowing the four guide rods 5 to pass through. This prevents the push plate 82 from interfering with the guide rods 5 during movement. During the pressure application to the battery by the push plate 82, a pressure sensor 9 installed in the center of the side plate 3 continuously monitors the pressure value. The pressure sensor 9 feeds back the detected pressure value to the controller 10. The controller 10 compares the feedback pressure value with the set value. If the detected pressure value is less than the set value, the controller 10 continues to send commands to the hydraulic cylinder 81, causing the piston rod of the hydraulic cylinder 81 to extend further, increasing the pressure. If the detected pressure value equals the set value... If the hydraulic cylinder 81 remains in its current state, and the detected pressure value is greater than the set value, the controller 10 sends a command to the hydraulic cylinder 81 to retract the piston rod of the hydraulic cylinder 81 to a certain extent, reducing the pressure until the pressure reaches the set value, thereby achieving precise control of the pressure to ensure that a stable and appropriate pressure is applied to the battery, ensuring that the lithium battery formation process is carried out in an ideal pressure environment. The uniform pressurization of the battery can effectively suppress gas from entering between the electrode and the separator, increase the adhesion between the electrode and the separator, thereby improving the battery performance and reducing the battery internal resistance. After the formation is completed, the controller 10 stops the operation of the hydraulic cylinder 81, opens the movable door 4, and takes out the lithium battery.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A lithium battery formation fixture, characterized in that: The lithium battery formation fixture includes a support frame (1), a limiting plate (2), a side plate (3), a movable door (4), a guide rod (5), a partition plate (6), a connecting plate (7), a pressurizing mechanism (8), a pressure sensor (9), and a controller (10). The three limiting plates (2) are installed on the support frame (1), the side plate (3) is installed at the end of the support frame (1), and the movable door (4) is detachably installed on the support frame (1). The limiting plate (2), the side plate (3), and the movable door (4) constitute a compression box (11). The interior of the compression box (11) The structure is designed as a cavity, with four guide rods (5) mounted on the side plate (3) inside the extrusion box (11). The partition (6) used to separate the batteries is slidably mounted on the guide rods (5). The connecting plate (7) is mounted on the support frame (1). The pressurizing mechanism (8) is mounted on the connecting plate (7) and located on one side of the extrusion box (11) and the partition (6). The pressure sensor (9) is mounted on the side plate (3). The controller (10) is mounted on the top of the support frame (1). The pressurizing mechanism (8), the pressure sensor (9), and the controller (10) are electrically connected.

2. The lithium battery formation fixture as described in claim 1, characterized in that: The pressurizing mechanism (8) includes a hydraulic cylinder (81), a push plate (82), a slide rod (83), and a limiting block (84). The hydraulic cylinder (81) is mounted on the connecting plate (7). The push plate (82) is connected to the piston rod of the hydraulic cylinder (81). Two slide rods (83) pass through the connecting plate (7) and are slidably mounted on the connecting plate (7), located on both sides of the hydraulic cylinder (81). The push plate (82) is connected to the slide rod (83). The limiting block (84) is mounted on the end of the slide rod (83). The hydraulic cylinder (81) is electrically connected to the controller (10).

3. A lithium battery formation fixture as described in claim 2, characterized in that: The push plate (82) is provided with a circular hole (821) for the four guide rods (5) to pass through. The diameter of the circular hole (821) is larger than the diameter of the guide rod (5).

4. A lithium battery formation fixture as described in claim 3, characterized in that: The four guide rods (5) are arranged in a rectangular pattern.

5. A lithium battery formation fixture as described in claim 1 or 2, characterized in that: The pressure sensor (9) is installed in the center of the side plate (3).

6. A lithium battery formation fixture as described in claim 1 or 2, characterized in that: The partition (6) is provided in multiple parts.

Images