Battery liquid injection and static device

Abstract

An embodiment of the present invention provides a battery liquid injection static device, which belongs to the field of battery technology. The device includes a static cavity, a locking structure, an upper box mechanism, and a first cylinder. The static cavity is used to place batteries and liquid injection cups, and includes a static upper cavity and a static lower cavity. The static upper cavity is used to fix the liquid injection cup; the static lower cavity is arranged at the bottom of the static upper cavity and is used to place batteries; the locking structure is arranged between the liquid injection cup and the battery and is used to lock the static upper cavity and the static lower cavity; the upper box mechanism is arranged above the static cavity and is used to inject electrolyte into the battery; the first cylinder is arranged at the bottom of the static lower cavity and is used to lift the static lower cavity so that the static lower cavity and the static upper cavity are combined. The device improves the efficiency of battery production, the versatility and utilization rate of the liquid injection machine, and saves material costs.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a battery liquid injection and stationary device. Background Art

[0002] A battery's electrolyte, separator, positive electrode material, and negative electrode material are collectively known as its four major materials. Known as the battery's "blood," the electrolyte conducts lithium ions between the positive and negative electrodes, insulating them from electrons and ensuring smooth charging and discharging. It significantly impacts various lithium-ion battery properties, including the operating temperature range, cycle efficiency, safety, rate capability, and storage performance. The electrolyte's wetting properties play a crucial role.

[0003] As an important step in the production of lithium-ion batteries, liquid injection is mainly completed in a drying room. Therefore, ensuring the wetting effect is of great significance to the battery's cycle performance, storage performance, etc. The infiltration of the electrolyte into the electrode involves the three-phase contact of solid, liquid and gas. When the electrolyte is injected into the battery, the electrolyte must first expel the air in the battery, and then the electrolyte will adhere to the surface of the positive and negative active materials. Some electrolyte will pass through the membrane of the winding core and enter between the positive electrode-diaphragm-negative electrode. As time goes on, there will be a phenomenon that the electrolyte infiltrates the electrode and the electrolyte in the diaphragm reversely infiltrates the electrode. When the static time reaches a certain extent, under the action of surface tension, the infiltration of the electrode reaches a balanced state. If air bubbles fail to be expelled and remain on the surface of the positive and negative electrodes during this process, the wetting effect of the electrode at the location of the bubbles will be deteriorated. Secondly, in the later charging and discharging process of the battery, the bubbles will prevent lithium ions from passing through and accumulate on the surface of the electrode, causing lithium deposition. Long-term recycling will affect the safety performance of the product. Therefore, it is crucial to completely expel the bubbles from the battery during the wetting process.

[0004] Existing liquid injection machines mainly use two static injection modes: differential pressure injection and isobaric injection. Differential pressure injection uses the principle of negative pressure back suction to achieve injection, sucking the inside of the battery into a negative pressure, so that a pressure difference is formed between the inside of the battery and the space where the electrolyte is located, and then the pressure difference is used to automatically suck the electrolyte into the battery shell. Isobaric injection is to apply pressure to the inside and outside of the battery at the same time, and perform injection when the pressure inside and outside the battery is balanced. At present, liquid injection machines with a single injection mode have poor versatility. It is necessary to select the corresponding injection mode according to the type of battery and the material of the battery shell, which increases the purchase types and quantity of liquid injection machines and increases costs. At the same time, the switching time and workload of the injection mode are increased, which is not conducive to improving battery production efficiency. Summary of the Invention

[0005] The purpose of the embodiment of the present invention is to provide a battery liquid injection and static device, which combines differential pressure liquid injection and isobaric liquid injection, which not only improves the efficiency of battery production and the versatility and utilization rate of the liquid injection machine, but also saves material costs.

[0006] To achieve the above objectives, an embodiment of the present invention provides a battery liquid injection and static device, comprising: a static chamber, a locking structure, an upper box mechanism, and a first cylinder. The static chamber is used to place batteries and a liquid injection cup, and includes an upper static chamber and a lower static chamber. The upper static chamber is used to fix the liquid injection cup; the lower static chamber is located at the bottom of the upper static chamber and is used to place batteries; the locking structure is located between the liquid injection cup and the battery and is used to lock the upper and lower static chambers; the upper box mechanism is located above the static chamber and is used to inject electrolyte into the battery; the first cylinder is located at the bottom of the lower static chamber and is used to lift the lower static chamber so that the lower static chamber and the upper static chamber can be closed.

[0007] Optionally, the upper box mechanism includes:

[0008] A liquid preparation cup, which is arranged on the top of the upper box body and is used to hold electrolyte;

[0009] a diaphragm valve, the diaphragm valve being disposed below the liquid preparation cup and being used to be opened to start liquid injection;

[0010] A transition nozzle is provided at the bottom of the upper box body mechanism to facilitate the connection of the liquid filling cup.

[0011] Optionally, the upper box mechanism includes a second cylinder, which is connected to the transition nozzle and is used to drive the transition nozzle to move downward to connect with the liquid filling cup, or drive the transition nozzle to move upward to disconnect from the liquid filling cup.

[0012] Optionally, the liquid injection cup includes:

[0013] A liquid injection cup nozzle, the liquid injection cup nozzle is arranged on the top of the static cavity;

[0014] A reciprocating return mechanism, which is sleeved on the liquid spout of the liquid injection cup and is used to move the liquid spout of the liquid injection cup up and down;

[0015] A sealing ring is provided between the liquid spout of the liquid filling cup and the static cavity, and is used for maintaining air tightness when the liquid spout of the liquid filling cup moves back and forth.

[0016] Optionally, the reciprocating restoring mechanism may be a compression spring.

[0017] Optionally, the lower static chamber includes a battery cell tray, which is arranged at the bottom of the lower static chamber and is used to support the battery.

[0018] Optionally, a cavity air nozzle is provided between the static cavity and the outside.

[0019] Optionally, a cavity air nozzle is provided between the static cavity and the outside.

[0020] Optionally, the battery liquid filling and standing device further includes a residual liquid collecting device connected to the standing cavity for collecting residual electrolyte after standing.

[0021] Through the above technical solution, the present invention provides a battery liquid injection static device by setting a static cavity, a locking structure, an upper box mechanism and a first cylinder. The static cavity is used to place batteries and liquid injection cups, including a static upper cavity and a static lower cavity, and the static upper cavity is used to fix the liquid injection cup; the static lower cavity is set at the bottom of the static upper cavity and is used to place batteries; the locking structure is set between the liquid injection cup and the battery, and is used to lock the static upper cavity and the static lower cavity; the upper box mechanism is set above the static cavity and is used to inject electrolyte into the battery; the first cylinder is set at the bottom of the static lower cavity and is used to lift the static lower cavity so that the static lower cavity and the static upper cavity are combined. The liquid injection static device combines differential pressure injection and isobaric injection, which not only improves the efficiency of battery production and the versatility and utilization rate of the liquid injection machine, but also saves material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2. It is a schematic diagram of a battery liquid filling and stationary device system according to one embodiment of the present invention;

[0023] Figure 2 is a partial schematic diagram of liquid injection in a battery liquid injection station according to one embodiment of the present invention;

[0024] Figure 3 Schematic diagram of an upper box structure of a battery liquid filling and standing device according to one embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] 1. Let the upper chamber stand still 2. Fill the liquid cup

[0027] 3. Let the lower chamber stand still 4. Battery

[0028] 5. Locking structure 6. Upper box mechanism

[0029] 61. Liquid preparation cup 62. Diaphragm valve

[0030] 63. Transition nozzle 64. Second cylinder

[0031] 7. First cylinder 21, liquid injection cup nozzle

[0032] 22. Return mechanism 23. Sealing ring

[0033] 8. Cavity air nozzle 9. Liquid filling cup air nozzle

[0034] 10. Residual liquid collecting device DETAILED DESCRIPTION

[0035] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention.

[0036] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationships of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] like Figure 1 The figure shows a schematic diagram of a battery liquid filling and standing device according to the present invention. Figure 1 In the embodiment, the device includes a static chamber, a locking structure 5, an upper box mechanism 6 and a first cylinder 7. The static chamber is used to place the battery 4 and the liquid injection cup 2, and includes a static upper chamber 1 and a static lower chamber 3. The static upper chamber 1 is used to fix the liquid injection cup 2; the static lower chamber 3 is arranged at the bottom of the static upper chamber 1 and is used to place the battery 4; the locking structure 5 is arranged between the liquid injection cup 2 and the battery 4 and is used to lock the static upper chamber 1 and the static lower chamber 3; the upper box mechanism 6 is arranged above the static chamber and is used to inject electrolyte into the battery 4; the first cylinder 7 is arranged at the bottom of the static lower chamber 3 and is used to lift the static lower chamber 3 so that the static lower chamber 3 and the static upper chamber 1 are combined. The liquid injection static device combines differential pressure liquid injection and isobaric liquid injection, which not only improves the efficiency of battery production and the versatility and utilization rate of the liquid injection machine, but also saves material costs.

[0039] In this embodiment, the device includes an upper housing mechanism 6 for injecting electrolyte into the battery 4. The upper housing mechanism 6 includes a liquid preparation cup 61, a diaphragm valve 62, and a transition nozzle 63. The liquid preparation cup 61 is located at the top of the upper housing mechanism 6 and is used to hold the electrolyte. The diaphragm valve 62 is located below the liquid preparation cup 61 and is opened to initiate liquid injection. The transition nozzle 63 is located at the bottom of the upper housing mechanism 6 to facilitate connection with the liquid injection cup 2. Furthermore, in this embodiment, the contact between the filter tip 63 and the liquid injection cup 2 can be achieved using various methods known to those skilled in the art, such as electric cylinders and pneumatic cylinders. Given that the liquid injection and static device is implemented using a pressure differential, the upper housing mechanism 6 includes a second pneumatic cylinder 64 connected to the transition nozzle 63, which is used to move the transition nozzle 63 downward to connect with the liquid injection cup 2, or to move the transition nozzle 63 upward to disconnect from the liquid injection cup 2. Before injecting the electrolyte, the interface of the preparation cup 61 needs to be vacuumed to test the sealing of the injection cup 2 and the battery cell, and then the injection cup 2 is vacuumed to test the airtightness of the injection cup 2. If the airtightness of the injection cup 2 is good, the diaphragm valve 62 can be opened to start injection.

[0040] In this embodiment, the liquid-filling cup 2 includes a liquid-filling cup nozzle 21, a reciprocating mechanism 22, and a sealing ring 23. The liquid-filling cup nozzle 21 is disposed at the top of the static chamber; the reciprocating mechanism 22 is sleeved around the liquid-filling cup nozzle 21 to enable the liquid-filling cup nozzle 21 to move up and down; and the sealing ring 23 is disposed between the liquid-filling cup nozzle 21 and the static chamber to maintain airtightness during the reciprocating motion of the liquid-filling cup nozzle 21. The transition nozzle 63 and the liquid filling cup 2 are connected under the action of the second cylinder 64. During this process, when the transition nozzle 63 is on the liquid filling cup nozzle 21, the liquid filling cup nozzle 21 presses the reciprocating return mechanism 22 to move downward to a predetermined position, and the lower small hole of the liquid filling cup nozzle 21 passes through the sealing ring 23. Since the battery 4 cavity and the liquid filling cup 2 have been vacuumed, the electrolyte will be sucked into the battery 4 cavity through the action of the pressure difference. After the liquid filling is completed, the second cylinder 64 will drive the transition nozzle 63 to leave, the reciprocating return mechanism 22 returns to its initial position, the liquid filling cup nozzle 21 will also move upward, and the lower small hole of the liquid filling cup nozzle 21 will also move upward to above the sealing ring 23. This process ensures that the liquid filling cup 2 will not leak, thereby improving the airtightness during the liquid filling process.

[0041] In this embodiment, the reciprocating return mechanism 22 can be in various forms known to those skilled in the art, such as a connecting rod mechanism, a cam mechanism, a spiral mechanism, and a compression spring. However, considering that a compression spring can provide a resisting force against an external pressure, the reciprocating return mechanism 22 can be a compression spring, which is disposed on the liquid injection cup nozzle 21 and is used to drive the liquid injection cup nozzle 21 to move up and down.

[0042] During the process of contact between the battery 4 and the liquid filling cup 2, in order to ensure smooth contact between the battery 4 and the liquid filling cup 2, the static lower chamber 3 may include a cell tray, which is arranged at the bottom of the static lower chamber 3 and is used to support the battery 4. After the battery cells are loaded, the static lower chamber 3 drives the cell tray into the liquid filling position. The first cylinder 7 lifts the cell tray, so that the static lower chamber 3 and the static upper chamber 1 are closed. After closing, the locking device 5 is locked. This process completes the closing action of the static upper chamber 1 and the static lower chamber 3, so that the battery 4 and the liquid filling cup 2 are connected.

[0043] In this embodiment, a liquid filling cup air nozzle 8 is provided between the static chamber and the liquid filling cup 2, and a cavity air nozzle 9 is provided between the static chamber and the outside. During the static process, when the static chamber and the liquid filling cup 2 are at equal pressure, the vacuum high-pressure air path of the static chamber and the liquid filling cup 2 is connected, the liquid filling cup is evacuated through the liquid filling cup air nozzle 8, and the static chamber is evacuated through the cavity air nozzle 9, and positive pressure is applied to the inside and outside of the battery 4 at the same time. When the pressure inside and outside the battery 4 is balanced, the electrolyte entering the liquid filling cup 2 will be sucked into the battery 4 by applying positive pressure; when the static chamber and the liquid filling cup are at differential pressure, the static chamber is connected to normal pressure, the air path connecting the static chamber and the liquid filling cup 2 is closed, and the liquid filling cup 2 is evacuated alone. A pressure difference is formed between the inside of the battery 4 and the space where the electrolyte is contained in the liquid filling cup 2. The pressure difference is used to automatically suck the electrolyte into the shell of the battery 4, and the liquid injection is achieved by the negative pressure back suction principle. The universality of injection machines in isobaric injection mode and differential pressure injection mode is poor. It is necessary to select the corresponding injection mode according to the battery type and the material of the battery shell, which increases the purchase types and quantity of injection machines and increases the cost. At the same time, it also increases the switching time and workload of the injection mode, which is not conducive to improving the efficiency of battery production. The present invention integrates isobaric injection, static differential pressure injection and static differential pressure injection into one, and the injection mode of differential pressure injection or isobaric injection can be flexibly selected according to the injection requirements. It not only improves the efficiency of battery production and the universality and utilization rate of the injection machine, but also saves costs.

[0044] Taking into account that during the existing electrolyte injection and standing process, there will be a lot of electrolyte residue, which will increase production costs and waste electrolyte, and lead to subsequent problems in the treatment of electrolyte waste, the battery injection and standing device also includes a residual liquid collection device 10, which is connected to the standing cavity and is used to collect the residual electrolyte after standing to prevent the waste of electrolyte.

[0045] Through the above technical solution, the present invention provides a battery liquid injection static device by setting a static cavity, a locking structure 5, an upper box mechanism 6 and a first cylinder 7. The static cavity is used to place the battery 4 and the liquid injection cup 2, including a static upper cavity 1 and a static lower cavity 3. The static upper cavity 1 is used to fix the liquid injection cup 2; the static lower cavity 3 is arranged at the bottom of the static upper cavity 1 and is used to place the battery 4; the locking structure 5 is arranged between the liquid injection cup 2 and the battery 4, and is used to lock the static upper cavity 1 and the static lower cavity 3; the upper box mechanism 6 is arranged above the static cavity and is used to inject electrolyte into the battery 4; the first cylinder 7 is arranged at the bottom of the static lower cavity 3 and is used to lift the static lower cavity 3 so that the static lower cavity 3 and the static upper cavity 1 are combined. The liquid injection static device combines differential pressure injection and isobaric injection, which not only improves the efficiency of battery production and the versatility and utilization rate of the liquid injection machine, but also saves material costs.

[0046] The above describes in detail the optional implementation methods of the examples of the present invention in conjunction with the accompanying drawings. However, the implementation methods of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the implementation methods of the present invention, various simple modifications can be made to the technical solutions of the implementation methods of the present invention, and these simple modifications all fall within the scope of protection of the implementation methods of the present invention.

[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0048] In addition, various different embodiments of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A battery liquid filling and standing device, characterized in that: The device comprises: A static cavity, the static cavity is used to place the battery (4) and the liquid injection cup (2), and the static cavity comprises: A static upper chamber (1), wherein the static upper chamber (1) is used to fix the liquid injection cup (2); A lower static chamber (3) is provided at the bottom of the upper static chamber (1) and is used for placing the battery (4); A locking structure (5), the locking structure (5) being arranged between the liquid injection cup (2) and the battery (4) and being used to lock the static upper chamber (1) and the static lower chamber (3); An upper box mechanism (6), arranged above the static cavity, for injecting electrolyte into the battery (4); A first cylinder (7) is provided at the bottom of the static lower chamber (3) and is used to lift the static lower chamber (3) so that the static lower chamber (3) and the static upper chamber (1) are closed; The upper box mechanism (6) comprises: A liquid preparation cup (61), the liquid preparation cup (61) is arranged on the top of the upper box body mechanism (6) and is used to hold the electrolyte; a diaphragm valve (62), the diaphragm valve (62) being arranged below the liquid preparation cup (61) and being used for opening to start liquid injection; A transition nozzle (63), the transition nozzle (63) being arranged at the bottom of the upper box body mechanism (6) to facilitate connection of the liquid injection cup (2); The liquid injection cup (2) comprises: A liquid injection cup nozzle (21), the liquid injection cup nozzle (21) being arranged at the top of the static cavity; a reciprocating return mechanism (22), the reciprocating return mechanism (22) being sleeved on the liquid injection cup nozzle (21) and used for moving the liquid injection cup nozzle (21) up and down; A sealing ring (23) is provided between the liquid injection cup nozzle (21) and the static cavity, and is used to maintain airtightness when the liquid injection cup nozzle (21) reciprocates.

2. The battery liquid injection and standing device according to claim 1, characterized in that: The upper box mechanism (6) includes a second cylinder (64), which is connected to the transition nozzle (63) and is used to drive the transition nozzle (63) to move downward to connect with the liquid injection cup (2), or to drive the transition nozzle (63) to move upward to disconnect from the liquid injection cup (2).

3. The battery liquid injection and static device according to claim 1, characterized in that: The reciprocating restoring mechanism (22) is a compression spring.

4. The battery liquid injection and stationary device according to claim 1, characterized in that: The lower static chamber (3) comprises a battery cell tray, which is arranged at the bottom of the lower static chamber (3) and is used to support the battery (4).

5. The battery liquid injection and standing device according to claim 1, characterized in that: A liquid injection cup air nozzle (8) is provided between the static cavity and the liquid injection cup (2).

6. The battery liquid injection and standing device according to claim 1, characterized in that: A cavity air nozzle (9) is provided between the static cavity and the outside.

7. The battery liquid injection and stationary device according to claim 1, characterized in that: The battery liquid injection and standing device further comprises a residual liquid collecting device (10), which is connected to the standing cavity and is used for collecting residual electrolyte after standing.

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