Square battery formation tool

Abstract

The utility model discloses a lithium ion battery, which comprises an upper shell and a lower shell, the top end of the upper shell is hermetically provided with a positive electrode adapter column and a negative electrode adapter column, the upper shell and the lower shell are combined to form a sealed space for accommodating a target square battery, the upper shell and the lower shell are connected to form an internally closed gas accommodating cavity, and a liquid injection port of the target square battery is communicated with the gas accommodating cavity; the lower shell is of a square shell structure with the upper end open and the side face bottom face closed, and the lower shell and the upper shell are matched and connected in a sealed mode. According to the square battery formation tool disclosed by the utility model, the gas accommodating cavity is formed in the square battery formation tool and is communicated with the battery liquid injection port through the gas inlet, so that gas in the battery can be effectively managed; and meanwhile, the design of the exhaust valve ensures that the pressure is automatically released when the gas pressure exceeds a preset value, so that the overpressure condition is prevented, and the safety is improved. Meanwhile, the positive electrode adapter pin and the negative electrode adapter pin are in electric contact with the adapter column through the spring, the stability and reliability of electric contact are ensured through the spring, and good conductivity can be kept even in the long-time formation process.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion battery production, in particular to a tooling for processes such as formation and aging after liquid injection of a square metal shell lithium-ion battery. Background Technique

[0002] Due to its advantages such as high energy density, long cycle life, wide temperature range for operation, low self-discharge rate, and stable working voltage platform, lithium batteries have been widely used in fields such as electric vehicles and energy storage, and have a very broad market prospect. A lithium battery is a complex system, including components such as a positive electrode, a negative electrode, an electrolyte, and a separator, and involves processes such as electrochemical reactions between the positive and negative electrodes, conduction of lithium ions, transmission of electrons, and generation and diffusion of heat. Its production process is very complex and involves multiple production processes. After the battery is filled with liquid, it usually needs to be subjected to processes such as standing, formation, and aging to ensure the stability and reliability of the battery performance.

[0003] The formation process is a crucial step in the manufacturing process of lithium-ion batteries. In this process, by applying a certain current, the active substances on the positive and negative electrodes of the battery cell are activated, enabling the battery cell to have the ability to charge and discharge. During the formation process, a stable solid electrolyte interface (SEI) film is formed on the surface of the negative electrode, and the formation and stability of this SEI film have an important impact on the capacity and cycle life of the battery cell.

[0004] Conventional formation processes usually include the following steps: First, the liquid-injected battery is pre-sealed or temporarily closed and left to stand at a high temperature for a period of time, and then a current is applied to the battery cell to promote the formation of the SEI film; then, a charge-discharge process is carried out to further enhance the stability of the SEI film; finally, standing treatment is carried out again to ensure the stability of the SEI film. However, with the increase in the energy density of the battery, even if the standing time before and after charge-discharge is extended, it is difficult to ensure the wettability of the electrolyte and the stability of the SEI film.

[0005] CN108306062A discloses a formation method for improving the cycle life of a soft-pack power battery, a battery formation fixture and its application, and a soft-pack power battery, relating to the technical field of soft-pack power batteries. The formation method includes steps of subjecting the battery after liquid injection to multi-stage vacuum standing and vacuum sealing treatment, and then placing the battery after vacuum sealing in a battery formation fixture for aging, pre-charging treatment, standing, etc. Among them, the liquid immersion method of step-by-step vacuum standing after liquid injection can shorten the electrolyte absorption rate and the liquid leakage time; the aging process adopts pressure standing, which can make the electrolyte infiltrate more fully under a certain pressure; the pre-charging treatment adopts a battery formation fixture, which can make the positive and negative plates of the battery contact tightly, with a consistent SEI film composition, uniform and stable surface thickness. The invention also provides a battery formation fixture, which has a simple structure and is convenient to use, and is suitable for industrial production.

[0006] CN114335740A discloses a formation method for a lithium-ion battery and a lithium-ion battery. In the low-temperature formation stage, there is only the first electrolyte in the battery cell, so that in the low-temperature formation stage, the SEI film formed on the negative electrode surface of the lithium-ion battery is thinner and denser, which is beneficial to improving the storage performance of the battery cell; in the normal-temperature formation stage, the battery cell includes the first electrolyte and the second electrolyte, so that in the normal-temperature formation stage, the SEI film formed on the negative electrode surface of the lithium-ion battery is thicker, ensuring that the formed SEI film has relatively stable performance. Moreover, the components of the additives included in the first electrolyte and the second electrolyte make the by-products in the formation process less, thereby reducing the volume expansion caused by the accumulation of by-products during the cycling process, and thus ensuring that the formed SEI film has good characteristics and ensuring charging safety.

[0007] Currently, the disclosed formation methods and devices for prismatic batteries all have certain defects. In particular, the negative-pressure formation device for prismatic batteries is bulky, and it is easy to invade external humid air during the formation exhaust process, which has a negative impact on the cycle performance of the battery; therefore, the production environment of the negative-pressure formation process must be strictly dehumidified; strict environmental dehumidification will inevitably result in high production energy consumption costs. Therefore, it is crucial to develop and design a new type of formation supporting device for prismatic metal shell batteries that does not require environmental dehumidification. Utility Model Content

[0008] The present utility model discloses a formation tooling for a prismatic battery to solve the above-mentioned technical problems to a certain extent, which includes an upper shell, a cross beam and a lower shell. The top of the cross beam is hermetically provided with positive and negative transfer posts.

[0009] The upper end of the upper shell is hermetically connected to the cross beam. The lower end of the upper shell is an opening structure for the target square battery to enter. After the upper shell and the lower shell are combined, a sealed space for accommodating the target square battery is formed. A sealed space is provided inside the cross beam as a gas accommodation chamber. One side of the cross beam facing the upper shell is provided with an air inlet. The air inlet is communicated with the liquid injection port of the target square battery, and the air inlet is communicated with the gas accommodation chamber.

[0010] The lower shell is a square shell structure with an open upper end and a closed side and bottom. The lower shell is matched with and hermetically connected to the upper shell.

[0011] On one side of the cross beam facing the upper shell, positive and negative transfer pins are provided. The positive and negative transfer pins protrude from the surface of the cross beam and correspond to the positive and negative pole columns of the target square battery respectively. A sealed rubber insulating layer is provided between the positive and negative transfer pins and the cross beam.

[0012] The positive and negative transfer columns provided on the cross beam correspond one by one to the positive and negative transfer pins. The positive and negative transfer columns are in electrical contact with the positive and negative transfer pins through springs respectively. A rubber insulating layer is provided between the positive and negative transfer columns and the cross beam. An exhaust valve is provided at either the left or right end of the cross beam. The exhaust valve is communicated with the gas accommodation chamber. The exhaust valve opens and releases pressure when the internal pressure in the gas accommodation chamber exceeds the preset pressure.

[0013] A support device is provided on the bottom surface of the lower shell. The elastic force of the support device pushes the target square battery towards the position of the cross beam facing the upper shell, so that the positive and negative pole columns of the target square battery are in electrical contact with the positive and negative transfer pins provided on the cross beam.

[0014] This square battery formation tooling adopts a split and quick-assembly combined tooling structure composed of an upper shell, a cross beam and a lower shell. When needed, the user can insert the square battery into the upper shell, and then dock and assemble the lower shell with the upper shell to form a sealed cavity. This tooling structure can effectively fix the target square battery, ensure that the battery is not affected by the humidity of the working environment during the processes of standing, formation and aging after liquid injection, not only improves the performance of the battery, but also greatly reduces the dehumidification energy consumption cost in battery production.

[0015] At the same time, the liquid injection port of the target square battery is communicated with the gas accommodation chamber. The generated gas enters the gas accommodation chamber through the air inlet. When the gas in the gas accommodation chamber reaches a relatively high level and the internal pressure of the chamber is too high and reaches the preset pressure, the exhaust valve provided at either the left or right end of the cross beam opens and releases pressure, so that the gas accommodation chamber works within a safe range.

[0016] When the user performs the formation process on the square battery, the positive and negative transfer pins provided on the cross beam can be conveniently connected to the positive and negative electrode posts of the battery, so that the formation process of the target square battery can be completed inside the sealed housing. And a sealed rubber insulating layer is provided between the positive and negative transfer pins and the cross beam, so that the overall insulation of the square battery formation tooling is better, and it will not be charged due to the target battery, ensuring safety.

[0017] The square battery formation tooling involved in the present utility model is internally provided with a gas accommodation cavity, which is communicated with the battery liquid injection port through the air inlet, and can effectively manage the gas inside the battery; at the same time, the design of the exhaust valve ensures that the pressure is automatically released when the gas pressure exceeds the preset value, preventing overpressure from occurring and improving safety. At the same time, the positive and negative transfer pins are in electrical contact with the transfer posts through springs, and the use of springs ensures the stability and reliability of the electrical contact, and good electrical conductivity can be maintained even during a long-term formation process.

[0018] The present utility model also discloses another square battery formation tooling, including an upper shell and a lower shell, and positive and negative transfer posts are hermetically arranged at the top end of the upper shell;

[0019] The lower end of the upper shell is an opening structure for the target square battery to enter, and a sealed space for accommodating the target square battery is formed after the upper shell and the lower shell are combined; an internally sealed gas accommodation cavity is formed by connecting the upper shell and the lower shell, and the liquid injection port of the target square battery is communicated with the gas accommodation cavity;

[0020] The lower shell is a square shell structure with an open upper end and a closed side and bottom surface, and the lower shell is matched and hermetically connected with the upper shell;

[0021] On the side of the top end of the upper shell facing the target square battery, positive and negative transfer pins are provided, and the positive and negative transfer pins respectively correspond to the positive and negative electrode posts of the target square battery;

[0022] The positive and negative transfer posts provided on the upper shell correspond one by one to the positive and negative transfer pins, the positive and negative transfer posts are in electrical contact with the positive and negative transfer pins through springs respectively, a rubber insulating layer is provided between the positive and negative transfer posts and the upper shell, and a rubber insulating layer is provided between the positive and negative transfer pins and the upper shell; an exhaust valve is arranged at any left or right end of the upper shell, the exhaust valve is communicated with the gas accommodation cavity, and the exhaust valve opens and releases pressure after the internal pressure of the gas accommodation cavity exceeds the preset pressure;

[0023] A protective sleeve is arranged around the outside of the positive and negative transfer pins, the protective sleeve restricts the lateral displacement of the positive and negative transfer pins, and the ends of the positive and negative transfer pins extend out of the protective sleeve;

[0024] A support device is provided on the bottom surface of the lower shell. The elastic force of the support device pushes the target square battery towards the position of the cross beam facing the upper shell, so that the positive and negative pole posts of the target square battery are in electrical contact with the positive and negative transfer pins provided on the cross beam.

[0025] This solution does not use a cross beam structure. The enclosed space formed by combining the entire upper shell and the lower shell is used as a gas storage chamber, increasing the volume of the gas storage chamber. A protective sleeve is arranged around the positive and negative transfer pins. The protective sleeve restricts the lateral displacement of the positive and negative transfer pins, making the positions of the positive and negative transfer pins relatively stable and increasing the service life of the formation tooling.

[0026] Preferably, the support device includes a spring and a top plate. One end of the spring is connected to the bottom surface of the lower shell, the other end of the spring is connected to the top plate, and the top plate is in contact with the bottom of the target square battery. This support device structure uses the combination of a spring and a top plate to achieve automatic alignment of the battery, ensure stable electrical contact, provide buffer protection, and adapt to batteries of different sizes. Its design is simple, low-cost, and easy to maintain, significantly improving the performance and usability of the battery formation tooling.

[0027] Preferably, the exhaust valve is connected to a vacuum pumping device to extract the gas in the gas storage chamber. This structure effectively removes air and impurities in the gas storage chamber, reduces the risk of oxidation and contamination, ensures that the formation process is carried out in a pure environment, and improves the quality of battery formation. At the same time, the vacuum pumping device can control the pressure in the chamber to prevent overpressure, further enhancing the safety and stability of the system.

[0028] Preferably, a fastener body is provided on the first side wall of the upper shell, and a fastening component is provided at the position corresponding to the first side wall of the lower shell. The fastening component is connected to the fastener body through a pull ring. Adding a fastener body and a fastening component on the basis of the upper shell and lower shell structures and connecting them through a pull ring can achieve rapid assembly and disassembly of the upper shell and the lower shell, simplify the operation process, and improve work efficiency. In addition, this structure ensures the stable connection of the upper shell and the lower shell, enhances the sealing performance, and further improves the safety and reliability of the formation process.

[0029] Preferably, the pull ring includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are connected by a spring, and springs are provided at both ends of the first connecting portion and the second connecting portion. This design can provide better buffering effects, reduce loosening or detachment of the fasteners caused by vibration or external forces, and improve the stability and durability of the connection. In addition, the elasticity of the spring makes the operation of the pull ring more labor-saving and flexible, enhances the convenience of assembly and disassembly, and ensures that the fasteners can still maintain a good connection state under different stresses, further improving the safety and reliability of the entire device.

[0030] Preferably, a first connection area is provided at the opening edge of the upper shell, and a second connection area is provided at the opening edge of the lower shell. The ratio of the thickness of the first connection area to the average thickness of the lower shell is selected from 1:3 to 2:3. The first connection area extends into the second connection area and fits tightly therewith. A sealing strip is provided at the position where the first connection area contacts the second connection area. This design further enhances the sealing effect between the upper shell and the lower shell, prevents external air and impurities from entering, and improves the purity of the formation environment. The design of the thickness ratio of the connection area ensures the tight fit of the two parts, enhancing the structural stability and durability. The use of the sealing strip also provides additional buffering and sealing protection, further improving the safety and reliability of the formation process. Overall, this structural design simplifies the assembly process, improves the sealing performance and structural stability, and ensures the efficiency and safety of the formation process.

[0031] Preferably, the ratio of the thickness of the first connection area to the average thickness of the lower shell is 1:2. This structure optimizes the tight fit between the upper shell and the lower shell, improves the structural stability and anti-deformation ability, and ensures that it is not easy to loosen or shift during use. In addition, the connection area with a thickness ratio of 1:2 can better withstand and disperse stress, increasing the durability and service life of the overall structure. Such a thickness ratio also provides sufficient space for installing the sealing strip while ensuring a tight fit, thereby further enhancing the sealing effect and ensuring the efficiency and safety of the formation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a three-dimensional schematic diagram of a square battery formation tooling disclosed by the present invention;

[0034] Figure 2 is a three-dimensional schematic diagram of another square battery formation tooling disclosed by the present invention;

[0035] Wherein, 1 is the upper shell, 11 is the first connection area, 2 is the lower shell, 21 is the second connection area, 3 is the cross beam, 31 is the positive transfer post, 32 is the negative transfer post, 33 is the positive transfer needle, 34 is the negative transfer needle, 4 is the exhaust valve, 5 is the top plate, 6 is the fastener body, 61 is the fastening component, 62 is the pull ring, 621 is the first connection part, 622 is the second connection part, and 7 is the protective sleeve. EMBODIMENTS

[0036] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence.

[0038] In the present utility model, unless otherwise stated, the orientation words such as "upper", "lower", "left", "right" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inside" and "outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation words do not limit the present utility model.

[0039] The following specific embodiments are only explanations of the present utility model, and they do not limit the present utility model. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

[0040] The present utility model will be described in detail below in conjunction with the accompanying drawings by way of examples.

[0041] Embodiment 1

[0042] As Figure 1 shown, this embodiment records a formation tooling for a square battery, which includes an upper shell 1, a cross beam 3 (the area corresponding to the reference numeral 3 in the drawing), and a lower shell 2. Positive and negative transfer posts 32 are hermetically arranged at the top end of the cross beam 3; the upper end of the upper shell 1 is hermetically connected to the cross beam 3, and the lower end of the upper shell 1 is an opening structure for the target square battery to enter. A sealed space for accommodating the target square battery is formed after the upper shell 1 and the lower shell 2 are combined; a sealed space is arranged inside the cross beam 3 as a gas accommodation chamber, and one side of the cross beam 3 facing the upper shell 1 is provided with an air inlet; the air inlet is communicated with the liquid injection port of the target square battery, and the air inlet is communicated with the gas accommodation chamber; the lower shell 2 is a square shell structure with an open upper end and a closed side and bottom surface, and the lower shell 2 is matched and hermetically connected with the upper shell 1.

[0043] On one side of the crossbeam 3 facing the upper shell 1, a positive transfer pin 33 and a negative transfer pin 34 are provided. The positive transfer pin 33 and the negative transfer pin 34 protrude from the surface of the crossbeam 3 and correspond to the positive transfer pin 33 and the negative pole column of the target square battery respectively. A sealed rubber insulation layer is provided between the positive transfer pin 33, the negative transfer pin 34 and the crossbeam 3; the positive transfer column 31 and the negative transfer column 32 provided on the crossbeam 3 correspond to the positive transfer pin 33 and the negative transfer pin 34 one by one. The positive transfer column 31 and the negative transfer column 32 are in electrical contact with the positive transfer pin 33 and the negative transfer pin 34 through springs respectively. A rubber insulation layer is provided between the positive transfer column 31, the negative transfer column 32 and the crossbeam 3; An exhaust valve 4 is provided at either the left or right end of the crossbeam 3. The exhaust valve 4 is communicated with the gas containing cavity. The exhaust valve 4 opens and releases pressure when the internal pressure of the gas containing cavity exceeds a preset pressure.

[0044] A support device is provided on the bottom surface of the lower shell 2. The elastic force of the support device pushes the target square battery towards the position of the crossbeam 3 facing the upper shell 1, so that the positive transfer column 31 and the negative pole column of the target square battery are in electrical contact with the positive transfer pin 33 and the negative transfer pin 34 provided on the crossbeam 3.

[0045] The support device includes a spring and a top plate 5. One end of the spring is connected to the bottom surface of the lower shell 2, the other end of the spring is connected to the top plate 5, and the top plate 5 is in contact with the bottom of the target square battery. And in this embodiment, the exhaust valve 4 is connected to a vacuum pumping device to pump the gas in the gas containing cavity.

[0046] In this embodiment, a fastener body 6 is provided on the first side wall of the upper shell 1. A fastening component 61 is provided at the position of the lower shell 2 corresponding to the first side wall. The fastening component 61 is connected to the fastener body 6 through a pull ring 62 to achieve a simple, efficient and stable connection effect. And the pull ring 62 includes a first connection portion 621 and a second connection portion 622, and both the first connection portion 621 and the second connection portion 622 are springs.

[0047] In this embodiment, a first connection area 11 is provided at the opening edge of the upper shell 1, and a second connection area 21 is provided at the opening edge of the lower shell 2. The ratio of the thickness of the first connection area 11 to the average thickness of the lower shell 2 is 1:2. The first connection area 11 extends into the second connection area 21 and fits tightly. A sealing rubber strip is provided at the position where the first connection area 11 contacts the second connection area 21.

[0048] Embodiment 2

[0049] As Figure 2As shown in the figure, this embodiment describes a formation tooling for a square battery, which includes an upper shell 1 and a lower shell. Positive and negative transfer posts are hermetically arranged at the top end of the upper shell 1; the lower end of the upper shell 1 is an opening structure for the target square battery to enter. After the upper shell 1 and the lower shell 2 are combined, a sealed space for accommodating the target square battery is formed; the upper shell 1 and the lower shell 2 are connected to form an internally sealed gas accommodation cavity, and the liquid injection port of the target square battery is communicated with the gas accommodation cavity.

[0050] The lower shell 2 is a square shell structure with an open upper end and a closed side and bottom surface. The lower shell 2 is matched and hermetically connected to the upper shell 1; on the side of the upper shell 1 facing the target square battery, a positive transfer needle and a negative transfer needle are arranged. The positive transfer needle and the negative transfer needle respectively correspond to the positive and negative pole columns of the target square battery; the positive and negative transfer posts arranged on the upper shell 1 correspond one by one to the positive transfer needle and the negative transfer needle. The positive transfer post and the negative transfer post are respectively in electrical contact with the positive transfer needle and the negative transfer needle through springs. Rubber insulating layers are arranged between the positive transfer post, the negative transfer post and the upper shell 1, and rubber insulating layers are arranged between the positive transfer needle, the negative transfer needle and the upper shell 1; an exhaust valve is arranged at the right end of the upper shell 1, and the exhaust valve is communicated with the gas accommodation cavity. The exhaust valve opens and releases pressure when the internal pressure of the gas accommodation cavity exceeds the preset pressure.

[0051] A protective sleeve 7 is arranged around the positive transfer needle and the negative transfer needle. The protective sleeve 7 restricts the lateral displacement of the positive transfer needle and the negative transfer needle, and the ends of the positive transfer needle and the negative transfer needle extend out of the protective sleeve 7; a support device is arranged on the bottom surface of the lower shell 2. The elastic force of the support device pushes the target square battery towards the position of the cross beam facing the upper shell 1, so that the positive and negative pole columns of the target square battery are in electrical contact with the positive transfer needle and the negative transfer needle arranged on the cross beam.

[0052] The support device includes a spring and a top plate 5. One end of the spring is connected to the bottom surface of the lower shell 2, and the other end of the spring is connected to the top plate 5. The top plate 5 is in contact with the bottom of the target square battery. And in this embodiment, the exhaust valve 4 is connected to a vacuum pumping device to pump the gas in the gas accommodation cavity.

[0053] In this embodiment, a fastener body 6 is arranged on the first side wall of the upper shell 1, and a fastening component 61 is arranged at the position corresponding to the first side wall of the lower shell 2. The fastening component 61 is connected to the fastener body 6 through a pull ring 62 to achieve a simple, efficient and stable connection effect. And the pull ring 62 includes a first connection part 621 and a second connection part 622, and both the first connection part 621 and the second connection part 622 are springs.

[0054] In this embodiment, a first connection area 11 is provided at the opening edge of the upper shell 1, and a second connection area 21 is provided at the opening edge of the lower shell 2. The ratio of the thickness of the first connection area 11 to the average thickness of the lower shell 2 is 1:3. The first connection area 11 extends into the second connection area 21 and fits tightly, and a sealing strip is provided at the position where the first connection area 11 contacts the second connection area 21.

Claims

1. A forming tool for a square battery, characterized in that it includes an upper shell, a cross beam and a lower shell, and positive and negative transfer posts are hermetically arranged at the top end of the cross beam; the upper end of the upper shell is hermetically connected to the cross beam, the lower end of the upper shell is an opening structure for the target square battery to enter, and a sealed space for accommodating the target square battery is formed after the upper shell and the lower shell are combined; a sealed space is arranged inside the cross beam as a gas accommodation cavity, and an air inlet is arranged on one side of the cross beam facing the upper shell; the air inlet is communicated with the liquid injection port of the target square battery, and the air inlet is communicated with the gas accommodation cavity; the lower shell is a square shell structure with an open upper end and a closed side and bottom surface, and the lower shell is matched and hermetically connected with the upper shell; positive and negative transfer needles are arranged on one side of the cross beam facing the upper shell, the positive and negative transfer needles protrude from the surface of the cross beam, and respectively correspond to the positive and negative pole columns of the target square battery, and a sealed rubber insulating layer is arranged between the positive and negative transfer needles and the cross beam; the positive and negative transfer posts arranged on the cross beam correspond one by one to the positive and negative transfer needles, the positive and negative transfer posts are in electrical contact with the positive and negative transfer needles through springs respectively, and a rubber insulating layer is arranged between the positive and negative transfer posts and the cross beam; an exhaust valve is arranged at any left or right end of the cross beam, the exhaust valve is communicated with the gas accommodation cavity, and the exhaust valve opens and releases pressure when the internal pressure of the gas accommodation cavity exceeds a preset pressure; a support device is arranged on the bottom surface of the lower shell, and the elastic force of the support device pushes the target square battery towards the position of the cross beam facing the upper shell, so that the positive and negative pole columns of the target square battery are in electrical contact with the positive and negative transfer needles arranged on the cross beam.

2. The formation tooling for the square battery according to claim 1, wherein The support device includes a spring and a top plate, one end of the spring is connected to the bottom surface of the lower shell, the other end of the spring is connected to the top plate, and the top plate is in contact with the bottom of the target square battery.

3. The formation tooling for the square battery according to claim 1, characterized in that, The exhaust valve is connected to a vacuum pumping device to pump the gas in the gas accommodation cavity.

4. The formation tooling for the square battery according to claim 1, characterized in that, A fastener body is arranged on the first side wall of the upper shell, a fastening component is arranged at the position corresponding to the first side wall of the lower shell, and the fastening component is connected to the fastener body through a pull ring.

5. The formation tooling for the square battery according to claim 4, characterized in that, The pull ring includes a first connecting portion and a second connecting portion, and both the first connecting portion and the second connecting portion are springs.

6. The formation tooling for the square battery according to claim 1, wherein A first connecting area is arranged at the opening edge of the upper shell, a second connecting area is arranged at the opening edge of the lower shell, the ratio of the thickness of the first connecting area to the average thickness of the lower shell is selected from 1:3 to 2:3, the first connecting area extends into the second connecting area and is closely matched, and a sealing rubber strip is arranged at the contact position between the first connecting area and the second connecting area.

7. The formation tooling for the square battery according to claim 6, characterized in that, The ratio of the thickness of the first connecting area to the average thickness of the lower shell is 1:

2.

8. A forming tool for a square battery, characterized in that it includes an upper shell and a lower shell, and positive and negative transfer posts are hermetically arranged at the top end of the upper shell; the lower end of the upper shell is an opening structure for the target square battery to enter, and a sealed space for accommodating the target square battery is formed after the upper shell and the lower shell are combined; an internally sealed gas accommodation cavity is formed by connecting the upper shell and the lower shell, and the liquid injection port of the target square battery is communicated with the gas accommodation cavity; The lower shell is a square shell structure with an open upper end and a closed side bottom surface, and the lower shell is matched and hermetically connected to the upper shell; On one side of the top end of the upper shell facing the target square battery, positive and negative transfer pins are provided, and the positive and negative transfer pins respectively correspond to the positive and negative electrode posts of the target square battery; The positive and negative transfer posts provided on the upper shell correspond one by one to the positive and negative transfer pins. The positive and negative transfer posts are in electrical contact with the positive and negative transfer pins through springs respectively. A rubber insulating layer is provided between the positive and negative transfer posts and the upper shell, and a rubber insulating layer is provided between the positive and negative transfer pins and the upper shell; An exhaust valve is provided at either the left or right end of the upper shell, and the exhaust valve is communicated with the gas accommodation cavity. The exhaust valve opens and releases pressure when the internal pressure of the gas accommodation cavity exceeds a preset pressure; A protective sleeve is provided around the outside of the positive and negative transfer pins. The protective sleeve restricts the lateral displacement of the positive and negative transfer pins, and the ends of the positive and negative transfer pins extend out of the protective sleeve; A support device is provided on the bottom surface of the lower shell. The elastic force of the support device pushes the target square battery towards the position of the cross beam facing the upper shell, so that the positive and negative electrode posts of the target square battery are in electrical contact with the positive and negative transfer pins provided on the cross beam.

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