A square wound battery impregnation device and impregnation method

Abstract

The present invention provides a square wound battery impregnation device and impregnation method, the device includes a servo motor, a restraint tray carrying device, a restraint tray, a temperature controller and a guide slide rail, the restraint tray can provide a stable restraint force to the battery cell, and at the same time exert a uniform and directional extrusion force on the battery cell to fully impregnate the electrolyte, the temperature controller is used to control the heating plate to heat the battery and maintain a constant temperature, thereby realizing heating-type impregnation, accelerating the flow and downward penetration of the electrolyte during the impregnation process, and utilizing the driving mechanism of the servo motor to vibrate the restraint tray up and down to realize vibration-type impregnation of the battery, thereby accelerating the downward penetration of the electrolyte located on the upper part of the battery after injection, the device structure is cleverly designed, can improve the electrolyte impregnation effect on the battery pole piece, shorten the impregnation time, improve production efficiency, reduce production energy consumption, save production cost, and the SEI film formed during battery formation is more dense and uniform, effectively improving battery performance.

Description

Technical Field

[0001] The present invention relates to the technical field of square lithium-ion batteries, and in particular to a square wound battery impregnation device and an impregnation method. Background Art

[0002] During the manufacturing process of prismatic lithium-ion batteries, a certain amount of electrolyte must be injected through the cell injection port into the baked, moisture-qualified cell within a specific dew point environment and time. At this point, some electrolyte begins to soak into the positive and negative electrodes and separator inside the cell. To ensure complete soaking of the positive and negative electrodes and separator, the cell is typically left standing for a period of time, a process known in the industry as the post-injection resting process.

[0003] At present, in order to improve the infiltration effect, manufacturers generally use vacuum injection or high-pressure injection for injection. After injection, the battery is naturally left at room temperature (25±3℃) or high temperature (45±3℃) for 24 to 48 hours for infiltration, so that the injected electrolyte can fully infiltrate the positive and negative electrodes and diaphragms inside the battery cell. After the infiltration is completed, the battery cell will undergo the formation process.

[0004] This traditional impregnation process has a long production cycle, resulting in energy waste and process time waste, and increased production costs. In addition, this impregnation process has a poor impregnation effect for square wound batteries with high compaction density, and the impregnation is incomplete. Although the electrolyte is injected once, the negative pressure pre-charging will suck the electrolyte out. In addition, the use of a coated diaphragm to ensure good adhesion between the positive and negative electrodes makes the impregnation of the electrode even more difficult, making it very easy to produce an impregnation dead zone at the core position of the wound electrode group. If the impregnation is not good and then pre-charging is performed, it is often found that there is an area in the center of the positive and negative electrodes that cannot be impregnated, resulting in black spots and lithium precipitation on the interface during subsequent battery cell formation. Secondly, during the impregnation process, gas is generated inside the battery cell shell, forming a micro-high pressure environment inside it, which increases the gas phase resistance at the solid-gas-liquid three-phase interface and increases the impregnation time and difficulty. Therefore, it is urgent to research and develop an electrolyte impregnation device and impregnation method for square wound lithium-ion batteries with high production efficiency and good impregnation effect. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a square wound battery impregnation device.

[0006] Another technical problem to be solved by the present invention is to provide an infiltration method using the above-mentioned square wound battery infiltration device.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A square wound battery impregnation device comprises a servo motor (1), a restraint tray carrying device (2), a restraint tray (3), a temperature controller (4) and a guide rail (6), wherein:

[0009] The restraint tray bearing device (2) is composed of a restraint tray bottom heating plate (2-1), a restraint heating tray bearing plate (2-2), a restraint tray bearing plate driving mechanism (2-3) and a bearing plate lifting motion guide slider (2-4); the restraint tray bearing plate driving mechanism (2-3) comprises a ball screw (2-3-1), a screw nut (2-3-2), an arc guide mechanism (2-3-3) and a slide rail slider (2-3-4); the ball screw (2-3-1) and the screw nut (2-3-2) are movably connected and perform transmission cooperation; the screw nut (2-3-2) is fixed on the arc guide mechanism (2-3-3); the slide rail slider (2-3-4) and the arc guide mechanism (2-3-3) are connected to each other. ) is fixedly connected, the restraining heating tray carrier plate (2-2) is provided with a carrier plate lifting motion guide rod (2-2-1), the carrier plate lifting motion guide rod (2-2-1) is fixedly connected to the restraining heating tray carrier plate (2-2); the restraining tray bottom heating plate (2-1) and the carrier plate lifting motion guide slider (2-4) are respectively fixed on the restraining heating tray carrier plate (2-2), the restraining heating tray carrier plate (2-2) and the restraining tray carrier plate driving mechanism (2-3) are movably connected through the carrier plate lifting motion guide rod (2-2-1) and the arc guide mechanism (2-3-3); the carrier plate lifting motion guide slider (2-4) and the guide rail (6) are movably guided and move relative to each other;

[0010] The restraint tray (3) is composed of a battery carrying box body (3-1), a guide rod (3-2), a battery clamp (3-3), a heating plate (3-4) and a pre-stressing screw (3-5); the guide rod (3-2) is fixedly connected to the battery carrying box body (3-1); the battery clamp (3-3) is slidably connected to the guide rod (3-2); the guide rod (3-2) guides the battery clamp (3-3); the heating plate (3-4) is adhered to the battery clamp (3-3); the pre-stressing screw (3-5) is movably connected to the battery carrying box body (3-1); the battery carrying box body (3-1) and the restraint heating tray bearing plate (2-2) of the restraint tray bearing device (2) are fastened together by bolts;

[0011] The temperature controller (4) is respectively connected to the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray, and is used to control the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray to uniformly heat the battery surface;

[0012] The servo motor (1) is fixedly connected to the ball screw (2-3-1) of the restraint tray bearing device (2), and the ball screw (2-3-1) is driven to rotate back and forth by the servo motor (1).

[0013] The above-mentioned square wound battery impregnation device adopts a servo motor (1) to drive the ball screw (2-3-1) to rotate back and forth, and the rotation of the screw is converted into a lateral reciprocating movement of the screw nut. The arc guide mechanism (2-3-3) and the screw nut (2-3-2) are fixed together, and the arc guide mechanism (2-3-3) also produces a lateral reciprocating motion. The guide rod (2-2-1) on the supporting plate (2-2) of the restrained heating tray is lifted and lowered in the arc guide groove of the arc guide mechanism (2-3-3). The lateral reciprocating motion of the arc guide mechanism (2-3-3) is converted into the up and down motion of the guide rod (2-2-1), so that the restraining tray (3) can vibrate continuously up and down. The vibration speed can be adjusted by the rotation speed of the servo motor (1). The whole process will make the electrolyte inside the battery flow, thereby making the impregnation effect of the battery cell better, and at the same time greatly shortening the impregnation time.

[0014] Preferably, in the above-mentioned square wound battery impregnation device, the bottom heating plate (2-1) of the restraining tray is locked on the restraining heating tray carrier plate (2-2) by means of flat-head bolts.

[0015] Preferably, in the square wound battery impregnation device, the support plate lifting and lowering motion guide slider (2-4) is fastened to the restrained heating tray support plate (2-2) by means of hexagonal bolts.

[0016] Preferably, in the above-mentioned square wound battery impregnation device, the guide rod (3-2) is locked on the battery carrying box body (3-1) by a hexagonal bolt.

[0017] Preferably, in the above-mentioned square wound battery impregnation device, the pre-pressing screw (3-5) and the battery carrying box body (3-1) are connected in a screw-nut manner.

[0018] Preferably, in the above-mentioned square wound battery impregnation device, the screw nut (2-3-2) is fastened to the arc-shaped guide mechanism (2-3-3) by bolts.

[0019] Preferably, in the above-mentioned square wound battery impregnation device, the slide rail slider (2-3-4) and the arc-shaped guide mechanism (2-3-3) are fixedly connected by hexagonal bolts.

[0020] Preferably, in the above-mentioned square wound battery impregnation device, the support plate lifting and lowering motion guide rod (2-2-1) is fixedly connected to the restraining heating tray support plate (2-2) by means of hexagonal bolts.

[0021] The infiltration method using the above-mentioned square wound battery infiltration device is as follows:

[0022] First, a restraint tray (3) is used to achieve a restraint function, so that the positive and negative electrodes of the battery are closely fitted to the interface of the diaphragm, thereby improving the infiltration effect;

[0023] Secondly, the heating function is realized by using the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray, which can significantly shorten the internal temperature rise time of the battery, thereby shortening the immersion time;

[0024] Finally, the servo motor (1) is used to drive the ball screw (2-3-1) to rotate back and forth to realize the vibration function, which can accelerate the electrolyte injected into the upper part of the battery to penetrate downward, thereby improving the infiltration efficiency and improving the production efficiency.

[0025] Preferably, the above-mentioned infiltration method comprises the following specific steps:

[0026] S1: Place the battery after filling and sealing into the restraint tray;

[0027] S2: Clamp the battery in the restraint tray under the preset restraint force to prevent the battery from being misaligned when vibrating;

[0028] S3: Turn on the heating plate at the bottom of the restraint tray and the heating plate inside the restraint tray to start heating, and stop heating when the temperature reaches 45°C;

[0029] S4: Set the parameters of the vibration platform and vibrate it, with the vibration direction perpendicular to the positive and negative poles of the battery;

[0030] S5: After the battery has been at rest for a total of 24 hours, turn off the vibration platform to release the battery's restraint.

[0031] Beneficial effects:

[0032] The above-mentioned square wound battery infiltration device uses a restraint tray to provide a stable restraint force to the battery cell, and at the same time exerts a uniform and directional extrusion force on the battery cell to fully infiltrate the electrolyte. The temperature controller is used to control the heating plate to heat the battery and maintain a constant temperature, thereby realizing heating infiltration and accelerating the flow and downward penetration of the electrolyte during the infiltration process. The servo motor drive mechanism is used to vibrate the restraint tray up and down to realize vibration infiltration of the battery, thereby accelerating the downward penetration of the electrolyte located on the upper part of the battery after injection. The device structure is cleverly designed, which can improve the infiltration effect of the electrolyte on the battery pole piece, shorten the infiltration time, improve production efficiency, reduce production energy consumption, and save production costs. The "three-in-one" infiltration method can ensure that the battery can be fully and effectively infiltrated before formation, avoid dead areas or black spots on the pole piece surface after the battery is formed, and make the SEI film formed during battery formation more dense and uniform, effectively improving battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a novel restrained heating vibration battery impregnation device provided by the present invention;

[0034] Figure 2 A schematic diagram of the restraint tray carrying device provided by the present invention;

[0035] Figure 3 A schematic diagram of a restraint tray provided by the present invention;

[0036] Figure 4 A schematic diagram of a driving mechanism for a restrained heating tray carrier plate provided by the present invention;

[0037] Figure 5 A schematic diagram of a restrained heating tray carrier plate provided by the present invention;

[0038] Figure 6 This is an operational flow chart of the infiltration method of the present invention;

[0039] Figure 7 This is a comparison chart of the wetting effect and the electrode interface state;

[0040] In the figure: 1-Servo motor 2-Constraint tray carrying device 3-Constraint tray 4-Thermostat

[0041] 5-square aluminum shell battery 6-guide rail 2-1-restraint tray bottom heating plate

[0042] 2-2- Restraint heating tray carrier plate 2-3- Restraint tray carrier plate driving mechanism

[0043] 2-4-Carrying plate lifting motion guide slider 3-1-Battery carrying box

[0044] 3-2-Guide rod 3-3-Battery clamp 3-4-Heating plate 3-5-Pre-load screw

[0045] 2-3-1-Ball screw 2-3-2-Screw nut 2-3-3-Arc guide mechanism

[0046] 2-3-4-Slide rail 2-2-1-Loading plate lifting guide rod DETAILED DESCRIPTION

[0047] The square wound battery impregnation device, optical fiber end force sensing device, and impregnation method of the present invention are described below with reference to the embodiments and drawings.

[0048] Example 1

[0049] like Figure 1-5As shown, a square wound battery impregnation device includes a servo motor 1, a restraint tray carrying device 2, a restraint tray 3, a temperature controller 4 and a guide rail 6, wherein:

[0050] The restraint tray bearing device 2 is composed of a restraint tray bottom heating plate 2-1, a restraint heating tray bearing plate 2-2, a restraint tray bearing plate driving mechanism 2-3 and a bearing plate lifting motion guide slider 2-4, the restraint tray bearing plate driving mechanism 2-3 includes a ball screw 2-3-1, a screw nut 2-3-2, an arc guide mechanism 2-3-3 and a slide rail slider 2-3-4, the ball screw 2-3-1 and the screw nut 2-3-2 are movably connected and transmission-matched by a screw nut, the screw nut 2-3-2 is fastened to the arc guide mechanism 2-3-3 by bolts, the slide rail slider 2-3-4 is fixedly connected to the arc guide mechanism 2-3-3 by hexagonal bolts, the restraint tray bearing plate driving mechanism 2-3 includes a ball screw 2-3-1, a screw nut 2-3-2, an arc guide mechanism 2-3-3 and a slide rail slider 2-3-4, the ball screw 2-3-1 and the screw nut 2-3-2 are movably connected and transmission-matched by a screw nut, the screw nut 2-3-2 is fastened to the arc guide mechanism 2-3-3 by bolts, the slide rail slider 2-3-4 is fixedly connected to the arc guide mechanism 2-3-3 by hexagonal bolts, A bearing plate lifting motion guide rod 2-2-1 is provided on the heat tray bearing plate 2-2, and the bearing plate lifting motion guide rod 2-2-1 is fixedly connected to the restraining heating tray bearing plate 2-2 by a hexagonal bolt. The restraining tray bottom heating plate 2-1 is locked on the restraining heating tray bearing plate 2-2 by a flat head bolt. The bearing plate lifting motion guide slider 2-4 is fastened to the restraining heating tray bearing plate 2-2 by a hexagonal bolt. The restraining heating tray bearing plate 2-2 and the restraining tray bearing plate driving mechanism 2-3 are movably connected by the bearing plate lifting motion guide rod 2-2-1 and the arc guide mechanism 2-3-3; the bearing plate lifting motion guide slider 2-4 is movably guided and moves relative to the guide rail 6;

[0051] The restraint tray 3 consists of a battery carrying box body 3-1, a guide rod 3-2, a battery clamping plate 3-3, a heating plate 3-4 and a pre-load screw 3-5. The guide rod 3-2 is locked on the battery carrying box body 3-1 by a hexagonal bolt. The battery clamping plate 3-3 is slidably connected to the guide rod 3-2. The guide rod 3-2 guides the battery clamping plate 3-3. The heating plate 3-4 is attached to the battery clamping plate 3-3. The pre-load screw 3-5 and the battery carrying box body 3-1 are movably connected by a screw nut.

[0052] The battery carrying box 3-1 is fastened together with the restraint heating tray carrying plate 2-2 of the restraint tray carrying device 2 by bolts;

[0053] The thermostat 4 is connected to the heating plate 3-4 and the heating plate 2-1 at the bottom of the restraint tray respectively, and is used to control the heating plate 3-4 and the heating plate 2-1 at the bottom of the restraint tray to uniformly heat the battery surface;

[0054] The servo motor 1 is fixedly connected to the ball screw 2-3-1 of the restraint tray carrying device 2, and the servo motor 1 drives the ball screw 2-3-1 to rotate back and forth.

[0055] The battery after filling is loaded on the restraint tray and the battery is clamped by the pre-compression screws 3-5, which can provide a stable restraining force to the battery cell and exert a uniform and directional extrusion force on the battery cell, so that the electrolyte can fully infiltrate the core position of the battery.

[0056] During the application process, the heating plates located on the side of the battery pressure plate inside the restraint tray and the bottom of the restraint tray are used to quickly raise the internal temperature of the battery to the high temperature ambient temperature (45±3°C) and maintain a constant temperature. This can greatly save the heating time of the battery core on the one hand, and on the other hand, improve the temperature consistency of each part and corner of the battery core, so that the electrolyte can quickly and fully penetrate into each part. The wetting effect can be significantly improved for square wound cores, especially square wound batteries with full-ear structures, while greatly shortening the wetting time. A thermostat is used to control the heating plate to uniformly heat the battery surface, and the temperature is stable and controllable, which accelerates the flow of solution during the wetting process and improves the wetting effect.

[0057] The square wound battery impregnation device adopts a servo motor 1 to drive the ball screw 2-3-1 to rotate back and forth, and the rotation of the screw is converted into a lateral reciprocating movement of the screw nut. The arc guide mechanism 2-3-3 and the screw nut 2-3-2 are fixed together, and the arc guide mechanism 2-3-3 also produces a lateral reciprocating motion. The lifting motion guide rod 2-2-1 of the bearing plate 2-2 of the restrained heating tray is in the arc guide groove of the arc guide mechanism 2-3-3. The lateral reciprocating motion of the arc guide mechanism 2-3-3 is converted into the up and down motion of the guide rod 2-2-1, so that the restraint tray 3 can vibrate continuously up and down. The vibration speed can be adjusted by the rotation speed of the servo motor 1. The whole process will make the electrolyte inside the battery flow, thereby making the impregnation effect of the battery cell better, and at the same time will greatly shorten the impregnation time.

[0058] Example 2

[0059] like Figure 6 As shown, the infiltration method using the above-mentioned square wound battery infiltration device is as follows:

[0060] The positive and negative electrodes of the prismatic aluminum-cased battery 5 are made of lithium iron phosphate and graphite, respectively. The compacted density of the lithium iron phosphate is 2.5g / cc, and the compacted density of the negative electrode is 1.5g / cc. This is produced as an LP33200207-300Ah prismatic aluminum-cased battery. After the battery cell is baked, it is tested for moisture. If the moisture test meets the standard, 1100g of electrolyte is injected at a time. After the injection is completed, the electrolyte is impregnated as follows:

[0061] S1: Place the square aluminum shell battery 5 after injection and sealing into the restraint tray;

[0062] S2: Use pre-load screws 3-5 to lock the batteries in the restraint tray with a pressure of 3000N to prevent the batteries from being misaligned when vibrating.

[0063] S3: Turn on the heating plate 2-1 at the bottom of the restraint tray and the heating plate 3-4 inside the restraint tray to start heating, and stop heating when the temperature reaches 45°C;

[0064] S4: Set the vibration platform parameters to vibrate with a sinusoidal wave and sweep the frequency from 5 Hz to 150 Hz and back to 5 Hz in a logarithmic sweep mode over 30 minutes. The vibration direction of the vibration platform is perpendicular to the positive and negative poles of the battery. The logarithmic sweep mode is to sweep from 5 Hz to 150 Hz with an acceleration of 8 m / s2 and control the amplitude to 0.8 mm, that is, the displacement is 1.6 mm. After each vibration cycle, it is placed for 30 minutes.

[0065] S5: After the battery has been at rest for a total of 24 hours, turn off the vibration platform to release the battery's restraint;

[0066] Example 3

[0067] Effect investigation experiment

[0068] Comparative example: immersion at 45°C under natural conditions for 36 hours, embodiment of the present application: immersion under 45°C restrained heating vibration for 24 hours, the immersion effect of the comparative example and the embodiment was detected by ultrasonic immersion equipment, and the results showed that the immersion area in the embodiment using the square wound battery immersion device and immersion method of the present invention was significantly larger than that in the comparative example; in addition, the battery interface state of the comparative example and the embodiment was disassembled to check, and it was found that the electrode interface of the embodiment was in good condition, while there was a dead zone in the electrode interface of the comparative example. The results are shown in Tables 1 and Figure 7 .

[0069] Table 1

[0070]

[0071]

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A square wound battery impregnation device, characterized by: The invention comprises a servo motor (1), a restraint tray bearing device (2), a restraint tray (3), a temperature controller (4) and a guide rail (6), wherein the restraint tray bearing device (2) is composed of a restraint tray bottom heating plate (2-1), a restraint heating tray bearing plate (2-2), a restraint tray bearing plate driving mechanism (2-3) and a bearing plate lifting motion guide slider (2-4), the restraint tray bearing plate driving mechanism (2-3) comprises a ball screw (2-3-1), a screw nut (2-3-2), an arc guide mechanism (2-3-3) and a slide rail slider (2-3-4), the ball screw (2-3-1) and the screw nut (2-3-2) are movably connected and transmission-matched, and the screw nut (2-3-2) is fixed on the arc guide mechanism (2-3-3). The slide rail slider (2-3-4) is fixedly connected to the arc-shaped guide mechanism (2-3-3); the restraining heating tray carrier plate (2-2) is provided with a carrier plate lifting motion guide rod (2-2-1); the carrier plate lifting motion guide rod (2-2-1) is fixedly connected to the restraining heating tray carrier plate (2-2); the restraining tray bottom heating plate (2-1) and the carrier plate lifting motion guide slider (2-4) are respectively fixed on the restraining heating tray carrier plate (2-2); the restraining heating tray carrier plate (2-2) and the restraining tray carrier plate driving mechanism (2-3) are movably connected through the carrier plate lifting motion guide rod (2-2-1) and the arc-shaped guide mechanism (2-3-3); the carrier plate lifting motion guide slider (2-4) and the guide rail (6) are movably guided and move relative to each other; The restraint tray (3) is composed of a battery carrying box body (3-1), a guide rod (3-2), a battery clamp (3-3), a heating plate (3-4) and a pre-stressing screw (3-5); the guide rod (3-2) is fixedly connected to the battery carrying box body (3-1); the battery clamp (3-3) is slidably connected to the guide rod (3-2); the guide rod (3-2) guides the battery clamp (3-3); the heating plate (3-4) is adhered to the battery clamp (3-3); the pre-stressing screw (3-5) is movably connected to the battery carrying box body (3-1); the battery carrying box body (3-1) and the restraint heating tray bearing plate (2-2) of the restraint tray bearing device (2) are fastened together by bolts; The temperature controller (4) is respectively connected to the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray, and is used to control the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray to uniformly heat the battery surface; The servo motor (1) is fixedly connected to the ball screw (2-3-1) of the restraint tray bearing device (2), and the ball screw (2-3-1) is driven to rotate back and forth by the servo motor (1).

2. The square wound battery impregnation device according to claim 1, characterized in that: The bottom heating plate (2-1) of the restraint tray is locked on the bearing plate (2-2) of the restraint heating tray by means of flat-head bolts.

3. The square wound battery impregnation device according to claim 1, characterized in that: The guide slide block (2-4) for the lifting movement of the bearing plate is fastened to the restraining heating tray bearing plate (2-2) by using hexagonal bolts.

4. The square wound battery impregnation device according to claim 1, characterized in that: The guide rod (3-2) is locked on the battery carrying box body (3-1) by means of a hexagonal bolt.

5. The square wound battery impregnation device according to claim 1, characterized in that: The pre-pressing screw (3-5) and the battery carrying box body (3-1) are connected in a screw-nut manner.

6. The square wound battery impregnation device according to claim 1, characterized in that: The screw nut (2-3-2) is fastened to the arc-shaped guide mechanism (2-3-3) via bolts.

7. The square wound battery impregnation device according to claim 1, characterized in that: The slide rail slider (2-3-4) is fixedly connected to the arc-shaped guide mechanism (2-3-3) via hexagonal bolts.

8. The square wound battery impregnation device according to claim 1, characterized in that: The bearing plate lifting motion guide rod (2-2-1) is fixedly connected to the restraining heating tray bearing plate (2-2) via hexagonal bolts.

9. An impregnation method using the square wound battery impregnation device according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: First, a restraint tray (3) is used to achieve a restraint function, so that the positive and negative electrodes of the battery are closely fitted to the interface of the diaphragm, thereby improving the infiltration effect; Secondly, the heating function is realized by using the heating plate (3-4) and the heating plate (2-1) at the bottom of the restraint tray, which can significantly shorten the internal temperature rise time of the battery, thereby shortening the immersion time; Finally, the servo motor (1) is used to drive the ball screw (2-3-1) to rotate back and forth to realize the vibration function, which can accelerate the electrolyte injected into the upper part of the battery to penetrate downward, thereby improving the infiltration efficiency and improving the production efficiency.

10. The infiltration method according to claim 9, characterized in that: The specific steps are as follows: S1: Place the battery after filling and sealing into the restraint tray; S2: Clamp the battery in the restraint tray under the preset restraint force to prevent the battery from being misaligned when vibrating; S3: Turn on the heating plate at the bottom of the restraint tray and the heating plate inside the restraint tray to start heating, and stop heating when the temperature reaches 45°C; S4: Set the parameters of the vibration platform and vibrate it, with the vibration direction perpendicular to the positive and negative poles of the battery; S5: After the battery has been at rest for a total of 24 hours, turn off the vibration platform to release the battery's restraint.

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