Negative pressure cup and formation equipment

Abstract

The utility model relates to battery manufacturing technical field discloses a negative pressure cup and formation equipment. Wherein the negative pressure cup includes cup main part and support, is provided with the air inlet and the gas outlet on cup main part, and the air inlet and the gas outlet intercommunication arrangement, support setting between the air inlet and the gas outlet, and there is isolating piece on the support, and isolating piece is used for gas -liquid separation, and the support is detachably connected with cup main part. The utility model discloses the negative pressure cup can be used to realize the gas -liquid separation in the battery monomer formation process. The formation equipment of being provided with above negative pressure cup, and the air inlet of negative pressure cup and the liquid injection hole intercommunication of battery monomer, the gas outlet of negative pressure cup and negative pressure device intercommunication, make the electrolyte loss less in the formation process.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a negative pressure cup and a formation device. Background Technology

[0002] After electrolyte is injected, battery cells typically require formation, which involves charging and discharging the battery. During the charging and activation process of formation, especially during the initial charge and discharge, the electrolyte inside the battery cell produces a significant amount of gas due to chemical reactions, such as CH4, H2, CO, and CO2. Excessive gas accumulation can lead to potential problems like swelling, black spots, and lithium plating, affecting the formation effect and the performance of the battery cell after formation. Therefore, it is crucial to promptly vent the generated gases to the outside of the battery casing during the battery replacement process.

[0003] In existing technologies, to address the aforementioned problems, formation equipment is typically equipped with a negative pressure system. This system generates negative pressure, allowing gas within the battery cell to be discharged into the vacuum line through the injection port. However, during the application of this system, the negative pressure not only causes gas to escape from the battery cell but also carries away electrolyte, resulting in electrolyte loss. Statistical analysis indicates that the electrolyte loss per battery cell is approximately 2g-10g.

[0004] Therefore, there is an urgent need for a negative pressure cup and a chemical formation device to solve the above problems. Utility Model Content

[0005] Based on the above, one of the objectives of this utility model is to provide a negative pressure cup that can be used to achieve gas-liquid separation during the formation of battery cells.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Negative pressure cups include:

[0008] The cup body has an air inlet and an air outlet, which are connected to each other.

[0009] A bracket is disposed between the air inlet and the air outlet. The bracket has an isolator for gas-liquid separation. The bracket is detachably connected to the cup body.

[0010] The beneficial effects of the above technical solution are as follows:

[0011] This utility model relates to a negative pressure cup, which includes a cup body with an inlet and an outlet. When the negative pressure cup is installed in a formation system, with the inlet connected to the electrolyte filling port of the battery cell and the outlet connected to the negative pressure device, the gas generated during formation can enter the cup body from the inlet under the action of negative pressure and then flow out of the cup body through the outlet. At this time, the negative pressure cup can play an auxiliary sealing and negative pressure conduction role between the negative pressure device and the electrolyte filling port of the battery cell; at the same time, due to the arrangement of the cup body, it can also play a certain role in gas-liquid separation, and the cup body can also be used to contain electrolyte. Since a support can be detachably installed on the cup body, and the support is equipped with an isolation component for gas-liquid separation, when the cup body with the support is connected between the negative pressure device and the electrolyte filling port of the battery cell, the gas-liquid separation effect during the formation process is better, preventing the electrolyte carried out with the negative pressure from entering the outlet, and the inlet can also be used for electrolyte reflux, effectively reducing electrolyte loss.

[0012] The second objective of this invention is to provide a formation device that results in less electrolyte loss during the formation process.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] The formation equipment includes a negative pressure device and a negative pressure cup as described in any of the above embodiments, wherein the air inlet of the negative pressure cup is connected to the liquid injection hole of the battery cell, and the air outlet of the negative pressure cup is connected to the negative pressure device.

[0015] The beneficial effects of the above technical solution are as follows:

[0016] The formation equipment of this invention is equipped with the aforementioned negative pressure cup. When the inlet and outlet of the negative pressure cup are connected to the electrolyte injection port of the battery cell and the negative pressure device, respectively, the negative pressure cup can perform gas-liquid separation and contain the electrolyte. Especially when the body of the negative pressure cup is equipped with a support, the isolation component of the support can achieve effective gas-liquid separation, preventing the electrolyte from entering the outlet. The electrolyte in the body of the cup can also flow back through the inlet, effectively reducing electrolyte loss. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0018] Figure 1 This is an explosion diagram of the negative pressure cup provided in a specific embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the lower shell of a negative pressure cup provided in a specific embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the top cover of a negative pressure cup provided in a specific embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the upper cover, support, and lower shell of a negative pressure cup provided in a specific embodiment of this utility model;

[0022] Figure 5 This is a cross-sectional view of the bracket for the negative pressure cup provided in a specific embodiment of this utility model;

[0023] Figure 6 This is a cross-sectional view of the sealing fit between the bracket and the top cover of the negative pressure cup provided in a specific embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the support for the negative pressure cup provided in a specific embodiment of this utility model;

[0025] Figure 8 This is a top view of another support for the negative pressure cup provided in a specific embodiment of this utility model.

[0026] In the picture:

[0027] 100. Cup body; 110. Top cover; 111. Air outlet; 112. First connecting part; 113. Guide surface; 114. Mating surface; 115. Exhaust chamber; 120. Lower shell; 121. Air inlet; 122. Second connecting part; 123. Liquid storage chamber; 124. Inner wall;

[0028] 200, bracket; 210, isolator; 220, mounting flange; 230, isolation hole; 240, explosion-proof valve; 241, thinning zone; 242, first notch;

[0029] 310. Sealing groove; 320. Sealing protrusion;

[0030] 410. Air inlet connector; 420. Air outlet connector. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0033] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Battery formation is a key process in the production of secondary batteries such as lithium-ion batteries and lead-acid batteries. Its core function is to activate the electrochemical system inside the battery cell through the first charge, enabling the battery cell to store and release electrical energy. Specifically, it includes the following aspects: activating active materials, forming a stable SEI film (unique to lithium-ion batteries), eliminating internal defects in the battery cell, and determining the initial capacity and performance parameters of the battery cell.

[0037] like Figures 1-8As shown, this embodiment provides a negative pressure cup that can be applied to a chemical formation system. The negative pressure cup includes a cup body 100 and a support 200. The cup body 100 is provided with an air inlet 121 and an air outlet 111, which are connected. The support 200 is disposed between the air inlet 121 and the air outlet 111. The support 200 has an isolation member 210 for gas-liquid separation. The support 200 is detachably connected to the cup body 100.

[0038] The negative pressure cup includes a cup body 100 with an inlet 121 and an outlet 111. When the negative pressure cup is installed in the formation system, and the inlet 121 is connected to the liquid injection port of the battery cell, and the outlet 111 is connected to the negative pressure device, the gas generated during formation can enter the cup body 100 from the inlet 121 under the action of negative pressure, and then flow out of the cup body through the outlet 111. At this time, the negative pressure cup can play an auxiliary sealing and negative pressure conduction role between the negative pressure device and the liquid injection port of the battery cell; at the same time, due to the installation of the cup body 100, it can also play a certain role in gas-liquid separation, and the cup body 100 can also be used to contain electrolyte. Since a support 200 can be detachably installed on the cup body 100, and the support 200 is provided with an isolation element 210 for gas-liquid separation. Therefore, when the cup body 100 with the support 200 is connected between the negative pressure device and the liquid injection port of the battery cell, the gas-liquid separation effect during the formation process is better, avoiding the electrolyte carried out with the negative pressure from entering the gas outlet 111, and the gas inlet 121 can also be used for electrolyte reflux, effectively reducing electrolyte loss.

[0039] It is worth noting that the separator 210 is configured as a separator membrane. A separator membrane is a type of functional membrane material used to separate gas and liquid, achieving the effect of "allowing one phase to pass through while blocking another phase." Specifically, the separator membrane is a gas-permeable but liquid-impermeable membrane, meaning it only allows gases (such as air, water vapor, and specific gas molecules) to pass through, while blocking liquids (such as water, oil, and electrolytes) from passing through. The principle is to utilize the "capillary effect" of liquid surface tension and membrane pores to achieve separation (liquid cannot penetrate the membrane's micropores due to surface tension, while gas molecules can diffuse freely). For example, the separator membrane can be an expanded polytetrafluoroethylene (e-PTFE) membrane, with a three-dimensional network porous structure composed of numerous interconnected fiber nodes and micropores. The micropore diameter is typically between 0.1 μm and 10 μm, and the porosity can reach 80%-90%, resulting in better chemical stability. In other embodiments, the separator membrane can also be a polyethylene (PE), polypropylene (PP) microporous membrane, polyvinylidene fluoride (PVDF) membrane, etc.

[0040] In this embodiment, the air permeability of the separator membrane is greater than or equal to 2 ml / s. Air permeability refers to the gas flow rate per unit area or volume per unit time under a specific pressure difference, reflecting the gas exchange capacity of the separator membrane. The air permeability of the separator membrane is set to 2 ml / s, 2.5 ml / s, 3 ml / s, 3.5 ml / s, 4 ml / s, etc., or any value satisfying the above-mentioned limitations.

[0041] This embodiment also discloses a formation apparatus, including a negative pressure device and a negative pressure cup as described in any of the above embodiments. The air inlet 121 of the negative pressure cup is connected to the electrolyte injection port of the battery cell, and the air outlet 111 of the negative pressure cup is connected to the negative pressure device. When the negative pressure cup is provided in the formation apparatus, and the air inlet 121 and air outlet 111 of the negative pressure cup are respectively connected to the electrolyte injection port of the battery cell and the negative pressure device, the negative pressure cup can perform gas-liquid separation and contain electrolyte. Especially when the cup body 100 of the negative pressure cup is provided with a support 200, the isolation element 210 of the support 200 can achieve effective gas-liquid separation, preventing electrolyte from entering the air outlet 111. The electrolyte in the cup body 100 can also flow back through the air inlet 121, effectively reducing electrolyte loss.

[0042] Specifically, the outlet 111 of the negative pressure cup is connected to the vacuum device through a negative pressure pipeline. The negative pressure cup equipped with a support 200 can effectively prevent electrolyte from entering the outlet 111, thereby reducing the impact and damage of electrolyte on the vacuum pipeline, ensuring the continuity and reliability of negative pressure generation, and ensuring the safety of the equipment.

[0043] Preferably, multiple negative pressure cups are provided, the same number as the number of battery cells to be formed, that is, each battery cell to be formed is connected to a negative pressure cup, and the vents 111 of the multiple negative pressure cups are all connected to a negative pressure device. This arrangement ensures that no electrolyte is lost from each battery cell during the formation process.

[0044] Continue to refer to Figure 1 The cup body 100 includes an upper cover 110 and a lower shell 120. The cup body 100 is designed as a separate unit, facilitating manufacturing and installation of the support 200. Of the two components, the air inlet 121 and the air outlet 111, one is located in the upper cover 110 and the other in the lower shell 120. The support 200 is positioned between the upper cover 110 and the lower shell 120. An exhaust chamber 115 is provided within the upper cover 110, and a liquid storage chamber 123 is provided within the lower shell 120. Because the support 200 has a separator 210, the electrolyte can be separated into the liquid storage chamber 123 and will not enter the exhaust chamber 115. After formation, the electrolyte in the liquid storage chamber 123 can also flow back into the battery cell through the air inlet 121 and the battery cell's injection port.

[0045] Specifically, such as Figure 2As shown, the air inlet 121 is located on the lower housing 120, and the air outlet 111 is located on the upper cover 110. To facilitate the outflow of electrolyte from the outlet 111 in the storage chamber 123, the inner wall 124 at the lower end of the negative pressure cup is inclined, and the air inlet 121 is located at the lower end of the inclined inner wall 124. That is, the lower end wall of the lower housing 120 is inclined to form the aforementioned inner wall 124, which provides guidance for the outflow of electrolyte, allowing the electrolyte in the storage chamber 123 to flow out completely and reducing waste.

[0046] Understandably, the air inlet 121 is equipped with an air inlet connector 410, and the air outlet 111 is equipped with an air outlet connector 420. That is, the air inlet 121 is connected to the electrolyte filling port of the battery cell via the air inlet connector 410, and the air outlet 111 is connected to the negative pressure pipeline via the air outlet connector 420. The connector design ensures a more reliable connection, improves ease of connection, and enhances the airtightness of the connection point.

[0047] Furthermore, to achieve a detachable connection between the bracket 200 and the shell body 100, the upper cover 110 and the bracket 200 can be detachably connected; the bracket 200 and the lower shell 120 can be detachably connected; or both the upper cover 110 and the bracket 200, and the upper cover 110 and the lower shell 120 can be detachably connected. When the bracket 200 is detachably connected to both the upper cover 110 and the lower shell 120, the bracket 200, the upper cover 110, and the lower shell 120 are three relatively independent components, facilitating separate manufacturing and assembly. Simultaneously, the bracket 200 can also be adapted to connect with the negative pressure cup of existing chemical formation systems, improving the gas-liquid separation effect of existing negative pressure cups and reducing the cost of additional mold production for the upper cover 110 or the lower shell 120.

[0048] In this embodiment, the bracket 200 is detachably connected to both the upper cover 110 and the lower housing 120, and the bracket 200 can be clamped between the upper cover 110 and the lower housing 120. To achieve the connection between the three, the negative pressure cup includes a connecting assembly, which includes a first connecting part 112 and a second connecting part 122. Of the first connecting part 112 and the second connecting part 122, one is disposed on the upper cover 110 and the other is disposed on the lower housing 120. When the bracket 200 is clamped between the upper cover 110 and the lower housing 120, the first connecting part 112 can be connected to the second connecting part 122.

[0049] Optionally, such as Figure 3 and Figure 4 As shown, the first connecting part 112 is configured as a buckle, and the second connecting part 122 is configured as a latching protrusion. When the upper cover 110, the bracket 200 and the lower housing 120 are connected in sequence and fastened to each other, the buckle can engage with the latching protrusion, thereby realizing the connection of the three.

[0050] Specifically, a snap-fit ​​is provided on the upper cover 110, and a latching protrusion is provided on the lower housing 120. To simplify the structure and increase the reliability of the contact between the lower housing 120 and the bracket 200, a connecting flange is provided at the end of the lower housing 120 that mates with the bracket 200, extending outward in the circumferential direction of the lower housing 120. The connecting flange also functions as a latching protrusion, engaging with the snap-fit ​​of the upper cover 110. Preferably, two snap-fits are provided, respectively located on opposite sides of the upper cover 110, to improve the reliability of the connection between the upper cover 110 and the lower housing 120.

[0051] For example, the snap fastener is provided with a guide surface 113 and a mating surface 114, wherein the guide surface 113 is inclined to the snap-fit ​​direction of the upper shell and the lower shell 120, and the mating surface 114 is perpendicular to the snap-fit ​​direction of the upper shell and the lower shell 120. During assembly, the bracket 200 can be placed on the lower shell 120 first, and then the upper cover 110 can be installed. When the upper cover 110 is installed, the guide surface 113 first abuts against the connecting flange. As the upper cover 110 moves closer to the lower shell 120, the connecting flange can squeeze the snap fastener to deform until the mating surface 114 disengages from the connecting flange. The snap fastener then returns to its original shape so that the mating surface 114 abuts against the side of the connecting flange away from the upper cover 110. At this time, the connection between the upper cover 110 and the lower shell 120 is completed, and the bracket 200 is stably clamped between the upper cover 110 and the lower shell 120.

[0052] Of course, in other embodiments, the buckle can be provided on the lower housing 120, and the buckle protrusion can be provided on the upper cover 110. At the same time, the above-mentioned connecting flange can be provided on the upper cover 110, which can also realize the connection between the upper cover 110, the bracket 200 and the lower housing 120. In addition, the connecting components can also be set in other forms, such as the form of a buckle and a lock hole; or the connecting components can also be set in the form of a bolt and a nut. Those skilled in the art can set them according to actual needs, and there is no limitation here.

[0053] To ensure the airtightness of the negative pressure cup, such as Figure 5 and Figure 6 As shown, the bracket 200 is detachably connected to the upper cover 110 and the lower housing 120 via a sealing structure, resulting in higher airtightness at the connection point after connection. Exemplarily, the sealing structure includes a sealing groove 310 and a sealing protrusion 320 circumferentially disposed relative to the bracket 200. By placing the sealing protrusion 320 within the sealing groove 310, the contact area between adjacent components is increased, thereby improving the sealing performance.

[0054] Specifically, the bracket 200 is provided with a mounting flange 220 in its circumferential direction, and at least part of the sealing structure is provided on the mounting flange 220 to improve the structural strength of the bracket 200. For example, the mounting flange 220 has a sealing protrusion 320 on one side and a sealing groove 310 on the other side, avoiding the weakening of strength caused by having sealing grooves 310 on both sides simultaneously; it also has a certain foolproof effect, avoiding a series of problems caused by incorrect assembly of the bracket 200. Correspondingly, one of the upper cover 110 and the lower housing 120 is provided with a sealing protrusion 320 and the other with a sealing groove 310 to adapt to the bracket 200. The sealing structure of the lower housing 120 is provided on the connecting flange.

[0055] Preferably, to further improve the sealing performance, a sealing ring can be provided in the sealing groove 310. After assembly, the sealing protrusion 320 can compress the sealing ring to cause deformation.

[0056] In this embodiment, the mating depth of the sealing groove 310 and the sealing protrusion 320 is H1 (mm). A deeper mating depth results in a better sealing effect. However, this also increases processing and assembly complexity, and the depth is related to the thickness of the mounting flange 220. When the thickness of the mounting flange 220 is H (mm), 0.1 ≤ H1 / H ≤ 0.6. When this ratio is too large, processing and assembly become more difficult, and the structural strength of the mounting flange 220 weakens. When this ratio is too small, the sealing performance weakens. For example, H1 / H can be set to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or any value satisfying the above limitations.

[0057] Furthermore, the width of the mounting flange 220 is W (mm), and the mating width of the sealing groove 310 and the sealing protrusion 320 is W1 (mm), where 0.1 ≤ W1 / W ≤ 0.6. These parameters represent the ratio of the mating width of the sealing groove 310 and the sealing protrusion 320 to the width of the mounting flange 220. When this ratio is too small, the mating width of the sealing groove 310 and the sealing protrusion 320 is too small, resulting in poor sealing performance; when this ratio is too large, the sealing effect of the mounting flange 220 is weakened. For example, W1 / W can be set to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, etc., or any value satisfying the above limitations.

[0058] Optionally, the flange width is set to 2mm-12mm, such as 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, etc., or any value satisfying the above-mentioned limitations; the thickness is set to 2mm-12mm, such as 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, etc., or any value satisfying the above-mentioned limitations; the mating width of the sealing groove 310 and the sealing protrusion 320 is set to 0.5mm-5mm, such as 0.5mm, 1.5mm, 2.5mm, 3.5mm, 4.5mm, 5mm, etc., or any value satisfying the above-mentioned limitations; the mating width of the sealing groove 310 and the sealing protrusion 320 is set to 0.5mm-5mm, such as 0.5mm, 1.5mm, 2.5mm, 3.5mm, 4.5mm, 5mm, etc., or any value satisfying the above-mentioned limitations.

[0059] As an alternative to negative pressure cups, such as Figure 5 and Figure 7 As shown, the support 200 is provided with an isolation hole 230, and the isolation member 210 covers the isolation hole 230 so that the gas-liquid mixture flowing out of the battery cell due to negative pressure can be separated by the gas in the isolation member 210, and the gas can further enter the gas outlet 111 through the isolation hole 230. It is understood that the area of ​​the isolation hole 230 is smaller than the area of ​​the isolation member 210 to provide space for the connection between the isolation member 210 and the support 200. The specific design of the isolation hole 230 is not specifically limited here; those skilled in the art can set it according to the gas flow rate and the inner diameter and cross-sectional shape of the cup body 100, such as circular, elliptical, or similar shapes. Figure 8 The rectangle shown is an example.

[0060] Specifically, to achieve the connection between the isolator 210 and the bracket 200, the isolator 210 and the bracket 200 are fixedly connected. When the bracket 200 is made of a material compatible with the isolator 210 (PTFE sheet, fluoroplastic), the connection can be achieved through heat fusion. Alternatively, a sealant (such as silicone sealant or butyl sealant) can be used for bonding, which is simpler to operate. In other embodiments, mechanical fixing methods can also be used, such as by additionally providing a fixing structure on the bracket 200, to achieve a clamping installation of the isolator 210 relative to the bracket 200.

[0061] It is worth noting that the spacer 210 and the bracket 200 are located close to the lower housing 120, so that when the gas enters the cup body 100 through negative pressure, it can apply pressure to the connection between the spacer 210 and the bracket 200 without damaging the connection between the spacer 210 and the bracket 200, making the connection between the spacer 210 and the bracket 200 more reliable.

[0062] Preferably, the bracket 200 is equipped with an explosion-proof valve 240. The explosion-proof valve 240 connects the air inlet 121 and the air outlet 111 when the pressure difference between the air inlet 121 and the air outlet 111 exceeds a preset pressure. The explosion-proof valve 240 facilitates direct connection between the air inlet 121 and the air outlet 111 when the isolation member 210 is blocked or partially blocked, resulting in reduced ventilation, thus preventing excessive pressure on the air inlet 121 side from damaging the battery cells. For example, the preset pressure, i.e., the burst pressure, is set to be no less than 10 kPa. The preset pressure setting needs to refer to the maximum pressure that the battery cell can withstand to ensure the formation yield of the battery cells; it also needs to consider the pressure difference on both sides of the isolation member 210 during operation. For example, the preset pressure is set to 10 kPa, 12 kPa, 14 kPa, 16 kPa, 18 kPa, 20 kPa, etc.

[0063] In this embodiment, the explosion-proof valve 240 includes a thinning region 241 and a first notch 242 disposed on the thinning region 241. The burst pressure of the notch-type explosion-proof valve 240 can be precisely set by the depth, length, and shape of the notch. The explosion-proof valve 240 with a thinning region 241 is easy to manufacture and has a more stable pressure relief path. The thinning region 241 is provided with a first burst pressure, and the first notch 242 is provided with a second burst pressure. The second burst pressure is less than the first burst pressure, and the first burst pressure is less than or equal to a preset pressure. By combining the thinning region 241 and the notch, and by placing the first notch 242 on the thinning region 241, the setting of the second burst pressure of the explosion-proof valve 240 is more precise. At the same time, after the pressure reaches the first burst pressure, rapid pressure relief can be achieved through the larger area of ​​the thinning region 241, further ensuring that the pressure inside the battery cell does not become excessive.

[0064] Optionally, the thinning area 241 can be circular, rectangular, or elliptical; the first notch 242 is radiating outwards from the thinning area 241 to prevent fragmentation when it is broken open. For example, the first notch 242 is arranged in a cross shape on the circular thinning area 241. Or as... Figure 8 As shown, the thinning region 241 is elliptical, and the first notch 242 is in the shape of a cross. Of course, those skilled in the art can set the shape of the thinning region 241 and the first notch 242 according to actual needs, and no specific limitation is made here.

[0065] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A negative pressure cup, characterized in that, include: A cup body (100) is provided with an air inlet (121) and an air outlet (111), and the air inlet (121) and the air outlet (111) are connected. A bracket (200) is disposed between the air inlet (121) and the air outlet (111). The bracket (200) has an isolation element (210) for gas-liquid separation. The bracket (200) is detachably connected to the cup body (100).

2. The negative pressure cup according to claim 1, characterized in that, The cup body (100) includes an upper cover (110) and a lower shell (120). Of the air inlet (121) and the air outlet (111), one is located on the upper cover (110) and the other is located on the lower shell (120). The upper cover (110) and the bracket (200), and / or the bracket (200) and the lower shell (120) are detachably connected.

3. The negative pressure cup according to claim 2, characterized in that, The negative pressure cup includes a connecting assembly, which includes a first connecting part (112) and a second connecting part (122). Of the first connecting part (112) and the second connecting part (122), one is disposed on the upper cover (110) and the other is disposed on the lower housing (120). When the bracket (200) is clamped between the upper cover (110) and the lower housing (120), the first connecting part (112) can be connected to the second connecting part (122).

4. The negative pressure cup according to claim 3, characterized in that, The first connecting part (112) is configured as a buckle, and the second connecting part (122) is configured as a protrusion, wherein the buckle can engage with the protrusion.

5. The negative pressure cup according to claim 2, characterized in that, The bracket (200) is detachably connected to the upper cover (110) and the lower housing (120) through a sealing structure. The sealing structure includes a sealing groove (310) and a sealing protrusion (320) circumferentially disposed relative to the bracket (200). The sealing protrusion (320) can be placed in the sealing groove (310).

6. The negative pressure cup according to claim 5, characterized in that, The bracket (200) is provided with a mounting flange (220) in the circumferential direction. The thickness of the mounting flange (220) is H, in mm. The mating depth of the sealing groove (310) and the sealing protrusion (320) is H1, in mm, 0.1≤H1 / H≤0.6; and / or, the width of the mounting flange (220) is W, in mm. The mating width of the sealing groove (310) and the sealing protrusion (320) is W1, in mm, 0.1≤W1 / W≤0.

6.

7. The negative pressure cup according to claim 1, characterized in that, The bracket (200) is provided with an isolation hole (230), and the isolation member (210) covers the isolation hole (230) and is fixedly connected to the bracket (200).

8. The negative pressure cup according to claim 1, characterized in that, An explosion-proof valve (240) is provided on the bracket (200). The explosion-proof valve (240) can connect the air inlet (121) and the air outlet (111) when the pressure difference between the air inlet (121) and the air outlet (111) is greater than a preset pressure. The preset pressure is not less than 10 kPa.

9. The negative pressure cup according to claim 8, characterized in that, The explosion-proof valve (240) includes a thinning zone (241) and a first notch (242) disposed in the thinning zone (241). The thinning zone (241) is provided with a first burst pressure, and the first notch (242) is provided with a second burst pressure. The second burst pressure is less than the first burst pressure, and the first burst pressure is less than or equal to the preset pressure.

10. The negative pressure cup according to claim 9, characterized in that, The thinning area (241) is set to be circular, rectangular or elliptical, and the first groove (242) is set in the thinning area (241) in a divergent manner.

11. The negative pressure cup according to claim 1, characterized in that, The inner wall of the lower end of the negative pressure cup is inclined, and the air inlet (121) is located at the lower end of the inclined inner wall.

12. The negative pressure cup according to claim 1, characterized in that, The air inlet (121) is provided with an air inlet connector (410), and the air outlet (111) is provided with an air outlet connector (420).

13. The negative pressure cup according to any one of claims 1-12, characterized in that, The isolation element (210) is configured as an isolation membrane, and the air permeability of the isolation membrane is greater than or equal to 2 ml / s.

14. A chemical formation device, characterized in that, It includes a negative pressure device and a negative pressure cup as described in any one of claims 1-13, wherein the air inlet (121) of the negative pressure cup is connected to the liquid injection hole of the battery cell, and the air outlet (111) of the negative pressure cup is connected to the negative pressure device.

15. The chemical formation apparatus according to claim 14, characterized in that, Multiple negative pressure cups are provided, and each battery cell is connected to one of the negative pressure cups. All of the multiple negative pressure cups are connected to the negative pressure device.

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