Battery cell airtightness detection protection mechanism and airtightness detection device

Abstract

Some embodiments of the present application provide a battery cell airtightness detection protection mechanism and an airtightness detection device. The protection tool in the battery cell airtightness detection protection mechanism includes a protection body and a bearing plate. The protection body in the protection tool forms a cavity for accommodating the battery cell. The bearing plate can be arranged at the second opening of the cavity. When the battery cell in the cavity is inflated during airtightness detection, the shell of the inflated battery cell will be supported on the surface of the protection body and the bearing plate towards the cavity, reducing the possibility of further deformation. Since the shell of the battery cell can be blocked by the protection body and the bearing plate when it is inflated, a larger area of the battery cell shell is protected by the protection tool, so that the battery cell is more comprehensively protected, reducing the possibility of damage due to excessive deformation during airtightness detection.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a battery cell airtightness testing and protection mechanism and airtightness testing device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] Battery devices typically consist of multiple battery cells. During the production of battery cells, it is necessary to test the airtightness of the assembled cells to improve their stability during operation. Since battery cells swell and inflate during airtightness testing, minimizing the potential damage to these cells during this process has become a focus of attention for those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell airtightness testing and protection mechanism and an airtightness testing device. The battery cell airtightness testing and protection mechanism can reduce the possibility of damage to the battery cell during the airtightness testing process.

[0005] In a first aspect, some embodiments of this application provide a battery cell airtightness testing and protection mechanism, which includes a protective fixture, the protective fixture including a protective body and a support plate, the protective body forming a cavity for accommodating a battery cell, the cavity having a first opening and a second opening at both ends in a first direction, and the support plate being able to block the second opening.

[0006] In the above structure, because the protective body of the protective fixture forms a cavity for accommodating the battery cell, and the support plate can block the second opening of the cavity, when the battery cell, inserted into the cavity through the first opening, expands due to inflation during the airtightness test, the bulging outer shell of the battery cell will abut against the surfaces of the protective body and the support plate facing the cavity, mitigating the possibility of further, larger deformation. Since the outer shell of the battery cell can be blocked by the protective body and the support plate when it expands, a large area of ​​the battery cell's outer shell is protected by the protective fixture, resulting in more comprehensive protection of the battery cell and reducing the possibility of damage due to excessive deformation during the airtightness test.

[0007] According to some embodiments of this application, the battery cell airtightness detection and protection mechanism includes a support plate movably connected to the inner surface of the cavity along a first direction. The battery cell airtightness detection and protection mechanism also includes a first driver, the output end of which is connected to the support plate, so that the support plate can move in the cavity along the first direction under the drive of the first driver. This allows the support plate to push the battery cell in the cavity closer to the first opening along the first direction, facilitating the quick removal of the battery cell from the cavity and improving the efficiency of airtightness detection using the battery cell airtightness detection and protection mechanism.

[0008] According to some embodiments of this application, the battery cell airtightness detection and protection mechanism has a through hole in the support plate. The through hole penetrates the support plate in a first direction, allowing air to circulate between the outside and the cavity. During the process of the battery cell being installed into the cavity from the first opening, the air in the cavity is compressed and flows out to the outside through the through hole, reducing the possibility of air trapped in the cavity and improving the smoothness of the battery cell being installed into the cavity.

[0009] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism includes a limiting boss protruding from the inner surface of the cavity. The limiting boss is closer to the second opening than the first opening and serves to block the carrier plate. By setting the limiting boss closer to the second opening than the first opening, the carrier plate is restrained by the limiting boss at a position close to the second opening. This ensures that the battery cell inserted into the cavity through the first opening is held in place by the carrier plate, which is restrained by the limiting boss, thus determining that the battery cell is properly inserted into the cavity.

[0010] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism includes a protective body with a latching protrusion that protrudes from the inner surface of the cavity. The latching protrusion is closer to the first opening than the second opening, and it can block the battery cell within the cavity. By setting the latching protrusion to protrude from the inner surface of the cavity, after the battery cell is inserted into the cavity through the first opening, the latching protrusion protruding from the inner surface of the cavity can block the battery cell on the outer side near the first opening. This not only helps to limit the position of the battery cell within the cavity, together with the support plate, but also limits the deformation of the portion of the battery cell's outer shell facing the latching protrusion by supporting it, reducing the possibility of damage due to excessive deformation.

[0011] According to some embodiments of the present application, the battery cell airtightness detection and protection mechanism includes a guide ramp on the latch, the orientation of which is at an acute angle to the orientation of the first opening. By setting the orientation of the guide ramp at an acute angle to the orientation of the first opening, when the battery cell is inserted through the first opening and passes through the latch, the guide ramp not only allows the battery cell to pass through more smoothly, but also allows the latch to undergo better elastic deformation to provide space for the battery cell to pass through.

[0012] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism includes a receiving hole. A portion of the protrusion is located in the receiving hole and connected to the bottom surface of the receiving hole via an elastic element, while another portion of the protrusion extends from the receiving hole into the cavity. By placing a portion of the protrusion in the receiving hole and connecting it to the bottom surface of the receiving hole via an elastic element, when the protrusion is resisted by other components such as a battery cell, it compresses the elastic element and enters the receiving hole, thus allowing the protrusion to avoid the passage of the battery cell.

[0013] According to some embodiments of this application, the battery cell airtightness detection and protection mechanism further includes a second driver and a push rod. The push rod is tractively connected to the output end of the second driver. Under the drive of the second driver, the push rod can push the latch into the receiving hole. Driven by the second driver, when the push rod pushes the latch into the receiving hole, the first driver can drive the support plate to move along the first direction toward the first opening, pushing the battery cell out of the cavity, facilitating the rapid removal of the battery cell from the cavity.

[0014] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism further includes a third driver and a suction cup. The suction cup is driven and connected to the output end of the third driver, and is used to adsorb battery cells. Driven by the third driver, the suction cup can transfer the adsorbed battery cells, allowing the tested battery cells to be quickly transferred away from the battery cell airtightness testing and protection mechanism, which helps to improve the efficiency of battery cell airtightness testing.

[0015] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism includes two first walls arranged opposite each other along a second direction and two second walls arranged opposite each other along a third direction. The second walls are connected between the two first walls, and the support plate is connected to the first walls and the second walls. The first direction, the second direction and the third direction are perpendicular to each other. The area of ​​the first wall is larger than the area of ​​the second wall, and the area of ​​the first wall is larger than the area of ​​the support plate.

[0016] According to some embodiments of this application, the battery cell airtightness detection and protection mechanism has a first end face at the end in the first direction, and the protection body is provided with an inlet inclined surface. The inlet inclined surface is connected between the first end face and the first opening, so that the inlet inclined surface can play a guiding role in the process of the battery cell being installed into the cavity from the first opening, thereby improving the smoothness of the battery cell being installed from the first opening.

[0017] According to some embodiments of this application, the battery cell airtightness testing and protection mechanism has a sliding coating on the inner surface of the cavity. The friction coefficient of the sliding coating is less than that of the protective fixture. The sliding coating can reduce the friction force on the battery cell when it is installed into the cavity and the friction force on the battery cell when it is pushed out of the cavity, which is beneficial to improving the efficiency of the battery cell moving quickly into and out of the cavity.

[0018] Secondly, some embodiments of this application provide a battery cell airtightness testing device, which includes the battery cell airtightness testing protection mechanism provided by any of the above-described technical solutions.

[0019] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0020] Some embodiments of this application provide a protective mechanism for testing the airtightness of a battery cell. This mechanism includes a protective fixture, which comprises a protective body and a support plate. The protective body forms a cavity for accommodating the battery cell. The cavity has a first opening and a second opening at its two ends in a first direction. The support plate is capable of blocking the second opening. In this structure, because the protective body forms a cavity for accommodating the battery cell, and the support plate is capable of blocking the second opening of the cavity, when a battery cell inserted into the cavity through the first opening bulges due to inflation during airtightness testing, the bulging outer shell of the battery cell abuts against the surfaces of the protective body and the support plate facing the cavity, mitigating the possibility of further, larger deformation. Since the bulging outer shell of the battery cell can be blocked by the protective body and the support plate, a larger area of ​​the battery cell outer shell is protected by the protective fixture, resulting in more comprehensive protection of the battery cell and reducing the possibility of damage due to excessive deformation during the airtightness testing process.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0023] Figure 1 This is a three-dimensional structural diagram of the protective fixture in the battery cell airtightness testing and protection mechanism provided in some embodiments of this application;

[0024] Figure 2 This is a schematic diagram illustrating the process of inserting a battery cell into a protective fixture, as provided in some embodiments of this application.

[0025] Figure 3 This is a first-view internal schematic diagram of a portion of the structure in the battery cell airtightness detection and protection mechanism provided in some embodiments of this application;

[0026] Figure 4 This is a second-view internal schematic diagram of a portion of the structure in the battery cell airtightness detection and protection mechanism provided in some embodiments of this application;

[0027] Figure 5 This is a second-view internal schematic diagram of a portion of the structure in the battery cell airtightness detection and protection mechanism provided in some embodiments of this application;

[0028] Figure 6 This is a top view of the protective fixture in the battery cell airtightness testing and protection mechanism provided in some embodiments of this application;

[0029] Figure 7 This is a second-view internal schematic diagram of a portion of the structure in the battery cell airtightness detection and protection mechanism provided in some embodiments of this application;

[0030] Figure 8 This is a second-view internal schematic diagram of a portion of the structure in the battery cell airtightness detection and protection mechanism provided in other embodiments of this application.

[0031] In the attached diagram:

[0032] 1. Protective fixture; 11. Protective body; 111. Cavity; 112. First opening; 113. Second opening; 114. Limiting boss; 115. Locking protrusion; 1151. Guide slope; 116. Receiving hole; 117. First wall; 118. Second wall; 119. First end face; 1110. Guide slope; 1111. Sliding coating; 12. Bearing plate; 121. Through hole; 13. Elastic element; 2. First actuator; 3. Second actuator; 4. Push rod; 5. Third actuator; 6. Suction cup; 7. Battery cell; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0035] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0037] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0040] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0041] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0042] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0043] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0044] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0045] As a crucial component of battery devices, individual battery cells have a significant impact on the performance of the entire battery system. During the battery device manufacturing process, it is typically necessary to perform airtightness testing on the assembled battery cells in order to improve their operational stability by enhancing their airtightness.

[0046] In some cases, it is necessary to fill the assembled battery cells with high-pressure helium gas for airtightness testing. Due to the high pressure of the helium gas, the battery cell casing will bulge. When the battery cell casing bulges, it is easy for the casing to be damaged due to excessive deformation, resulting in damage to the battery cell during the test.

[0047] To reduce the possibility of damage to individual battery cells during airtightness testing, some embodiments of this application provide a protective mechanism for battery cell airtightness testing. This mechanism includes a protective fixture comprising a protective body and a support plate. The protective body forms a cavity for accommodating the battery cell. The cavity has a first opening and a second opening at its two ends in a first direction, and the support plate can block the second opening. In this structure, because the protective body forms a cavity for accommodating the battery cell, and the support plate can block the second opening of the cavity, when a battery cell inserted into the cavity through the first opening inflates during airtightness testing, the inflated outer shell of the battery cell will abut against the surfaces of the protective body and the support plate facing the cavity, mitigating the possibility of further deformation. Since the inflated outer shell of the battery cell can be blocked by the protective body and the support plate, a large area of ​​the battery cell outer shell is protected by the protective fixture, resulting in more comprehensive protection of the battery cell and reducing the possibility of damage due to excessive deformation during airtightness testing.

[0048] The battery cell airtightness testing protection mechanism disclosed in this application can be applied to the process of airtightness testing of battery cells, as well as to the process of airtightness testing of other devices, so as to use protective fixtures to protect a large area of ​​the device and reduce the possibility of damage to the device due to excessive deformation during the airtightness testing process.

[0049] The technical solution of the battery cell airtightness detection and protection mechanism and airtightness detection device provided in the specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0050] Some embodiments of this application provide a battery cell 7 airtightness detection and protection mechanism, see reference. Figures 1 to 3 The airtightness testing and protection mechanism for the battery cell 7 includes a protective fixture 1. The protective fixture 1 includes a protective body 11 and a support plate 12. The protective body 11 forms a cavity 111 for accommodating the battery cell 7. The cavity 111 has a first opening 112 and a second opening 113 at both ends in the first direction X. The support plate 12 can block the second opening 113.

[0051] The protective fixture 1 can be a fixture used to contain and cover the battery cell 7 to limit the bulging and deformation of its outer shell. The protective body 11 can be the main component of the protective fixture 1, which can form a cavity 111 for containing the battery cell 7. When the battery cell 7 is tested for air tightness, the battery cell 7 can be located in the cavity 111.

[0052] The first opening 112 and the second opening 113 are opening structures at both ends of the cavity 111 in the first direction X, which are used to communicate with the outside. By making the cavity 111 have the first opening 112 and the second opening 113 at both ends in the first direction X, the protective body 11 is a cylindrical member with openings at both ends, so that the battery cell 7 can easily enter the cavity 111 through the opening and easily exit the cavity 111 through the opening.

[0053] When the battery cell 7 installed in the cavity 111 is inflated during the airtightness test, the outer peripheral surface of the inflated outer shell will press against the inner surface of the cavity 111 in the protective body 11, which limits the deformation of the outer shell and makes it less likely to undergo further greater deformation, thus reducing the possibility of damage to the outer shell due to excessive deformation.

[0054] The support plate 12 can be a component in the protective fixture 1 used to block the second opening 113. Since the second opening 113 and the first opening 112 are arranged opposite each other along the first direction X, blocking the second opening 113 by the support plate 12 not only makes it difficult for the battery cell 7 to fall out of the cavity 111 through the second opening 113 when it is inserted into the cavity 111 through the first opening 112, but also allows the battery cell 7 to be held against the support plate 12 to determine whether the battery cell 7 is properly inserted into the cavity 111. In addition, when the part of the outer shell facing the support plate 12 bulges, the support plate 12 can limit its bulging deformation by holding the part, making it less likely to undergo further large deformation, and reducing the possibility of damage to the outer shell due to excessive deformation.

[0055] For example, the first opening 112 can be set vertically upward and the second opening 113 can be set vertically downward. The battery cell 7 is inserted into the cavity 111 through the first opening 112. The support plate 12 limits the position of the battery cell 7 in the cavity 111 and bears the weight load of the battery cell 7 from the bottom of the battery cell 7.

[0056] For example, the outer shell of the battery cell 7 can be a steel shell with a thickness of 0.2mm. When high-pressure gas is filled into the battery cell 7 for airtightness testing, the outer shell will be bulged by the high-pressure gas and pressed against the inner wall of the cavity 111. The inner wall of the cavity 111 blocks and restricts the deformation of the outer shell, reducing the possibility of damage to the outer shell due to excessive deformation.

[0057] In the above structure, since the protective body 11 in the protective fixture 1 forms a cavity 111 for accommodating the battery cell 7, and the support plate 12 can block the second opening 113 of the cavity 111, when the battery cell 7, which is inserted into the cavity 111 through the first opening 112, expands due to inflation during the airtightness test, the outer shell of the expanded battery cell 7 will abut against the surfaces of the protective body 11 and the support plate 12 facing the cavity 111, thus mitigating the possibility of further deformation. Because the outer shell of the battery cell 7 can be blocked by the protective body 11 and the support plate 12 when it expands, a large area of ​​the outer shell of the battery cell 7 is protected by the protective fixture 1, so that the battery cell 7 is more comprehensively protected, reducing the possibility of damage to the battery cell 7 due to excessive deformation during the airtightness test.

[0058] In some embodiments, reference Figure 3 and Figure 4 The support plate 12 is movably connected to the inner surface of the cavity 111 along the first direction X. The airtightness detection and protection mechanism of the battery cell 7 also includes a first driver 2, the output end of which is connected to the support plate 12.

[0059] The support plate 12 is movably connected to the inner surface of the cavity 111 along the first direction X. Specifically, the support plate 12 is connected to the inner surface of the cavity 111 and can move along the inner surface of the cavity 111 along the first direction X.

[0060] The first driver 2 can be a device for driving the carrier plate 12 to move. By connecting the output end of the first driver 2 to the carrier plate 12, the carrier plate 12 can move in the cavity 111 along the first direction X under the drive of the first driver 2. This allows the carrier plate 12 to push the battery cell 7 in the cavity 111 closer to the first opening 112 along the first direction X, which facilitates the quick removal of the battery cell 7 from the cavity 111 and improves the efficiency of airtightness testing using the airtightness testing and protection mechanism of the battery cell 7.

[0061] For example, the first actuator 2 can be a hydraulic cylinder, a linear motor, or an electric cylinder. Those skilled in the art can select the type of the first actuator 2 according to the actual situation, as long as the first actuator 2 can output driving power to reciprocate along the first direction X.

[0062] In some embodiments, continue to refer to Figure 3 The support plate 12 is provided with a through hole 121, which penetrates the support plate 12 along the first direction X.

[0063] The through hole 121 can be a hole-like structure provided on the support plate 12. The through hole 121 penetrates the support plate 12 along the first direction X, so that the through hole 121 can connect the cavity 111 with the outside outside outside the second opening 113, allowing air to flow between the outside and the cavity 111 through the through hole 121. During the process of the battery cell 7 being inserted into the cavity 111 from the first opening 112, the air in the cavity 111 is compressed and flows out to the outside through the through hole 121, reducing the possibility of air trapped in the cavity 111. This helps to improve the smoothness of inserting the battery cell 7 into the cavity 111, making it easier to quickly insert the battery cell 7 into the cavity 111, and improving the efficiency of airtightness testing using the airtightness testing and protection mechanism of the battery cell 7.

[0064] In some embodiments, the protective fixture 1 is provided with a limiting boss 114, which protrudes from the inner surface of the cavity 111. The limiting boss 114 is closer to the second opening 113 than the first opening 112, and the limiting boss 114 is used to block the bearing plate 12.

[0065] The limiting boss 114 can be a structure used to restrict the movement of the support plate 12. It is used to limit the displacement of the support plate 12 away from the first opening 112 along the first direction X, which helps to reduce the possibility of the support plate 12 coming out of the second opening 113.

[0066] The limiting boss 114 protrudes from the inner surface of the cavity 111. This means that the limiting boss 114 protrudes from the inner surface of the cavity 111, thus blocking the movement of the support plate 12 along the inner surface of the cavity 111. By setting the limiting boss 114 closer to the second opening 113 than the first opening 112, the support plate 12 can be restricted by the limiting boss 114 to a position close to the second opening 113. This allows the battery cell 7, inserted into the cavity 111 from the first opening 112, to be held by the support plate 12, which is limited by the limiting boss 114, after being inserted into the cavity 111, thus determining that the battery cell 7 is properly inserted into the cavity 111.

[0067] For example, the surface of the limiting boss 114 facing away from the first opening 112 is flush with the second opening 113, so that the space in the cavity 111 can be better utilized, reducing the possibility of the battery cell 7 being exposed from the first opening 112, which is beneficial to the battery cell 7 being completely installed in the cavity 111.

[0068] In some embodiments, the protective body 11 is provided with a latching protrusion 115, which protrudes from the inner surface of the cavity 111. The latching protrusion 115 is closer to the first opening 112 than the second opening 113, and the latching protrusion 115 can block the battery cell 7 in the cavity 111.

[0069] The latching protrusion 115 can be a structure used to latch the battery cell 7 inserted into the cavity 111. By setting the latching protrusion 115 to protrude from the inner surface of the cavity 111, after the battery cell 7 is inserted into the cavity 111 through the first opening 112, the latching protrusion 115 protruding from the inner surface of the cavity 111 can block the outer side of the battery cell 7 near the first opening 112. It can not only be used together with the support plate 12 to limit the position of the battery cell 7 in the cavity 111, but also limit the deformation of the part of the battery cell 7 facing the latching protrusion 115 by resisting it, thereby reducing the possibility of damage to this part due to excessive deformation.

[0070] By setting the latch 115 to be closer to the first opening 112 than the second opening 113, the latch 115 can block the battery cell 7 from the side of the battery cell 7 that is closer to the first opening 112 when the battery cell 7 is installed in the cavity 111.

[0071] For example, the protrusion 115 can be configured as an elastic structure, so that the protrusion 115 can be deformed by the action of the battery cell 7 during the process of inserting the battery cell 7 from the first opening 112, so as to facilitate the battery cell 7 entering the cavity 111.

[0072] In some embodiments, the protrusion 115 is provided with a guide slope 1151, the orientation of which is set at an acute angle to the orientation of the first opening 112.

[0073] The guide ramp 1151 can be a ramp with a guiding function provided on the latch 115. By setting the orientation of the guide ramp 1151 at an acute angle to the orientation of the first opening 112, when the battery cell 7 is inserted from the first opening 112 and passes through the latch 115, the guide ramp 1151 not only allows the battery cell 7 to pass through more smoothly, but also allows the latch 115 to undergo better elastic deformation to provide space for the passage of the battery cell 7.

[0074] In some embodiments, the protective body 11 is provided with a receiving hole 116, a portion of the latching protrusion 115 is located in the receiving hole 116 and connected to the bottom surface of the receiving hole 116 through an elastic member 13, and another portion of the latching protrusion 115 extends from the receiving hole 116 into the cavity 111.

[0075] The receiving hole 116 can be a blind hole structure for setting the latching protrusion 115. By setting a portion of the latching protrusion 115 in the receiving hole 116 and connecting it to the bottom surface of the receiving hole 116 through the elastic member 13, when the latching protrusion 115 is resisted by other components such as the battery cell 7, the latching protrusion 115 will compress the elastic member 13 and enter into the receiving hole 116, so that the latching protrusion 115 can avoid the passage of the battery cell 7. By extending another portion of the latching protrusion 115 from the receiving hole 116 into the cavity 111, the latching protrusion 115 can block and limit the passage of the battery cell 7. With the above structure, when the battery cell 7 is inserted into the cavity 111 from the first opening 112, the latching protrusion 115 will compress the elastic member 13 and enter into the receiving hole 116 due to the resistance of the battery cell 7, thus avoiding the passage of the battery cell 7 and improving the smoothness of the battery cell 7 being inserted into the cavity 111.

[0076] For example, the elastic element 13 can be a spring or an elastic rubber block.

[0077] In some embodiments, reference Figure 5 The airtightness detection and protection mechanism for battery cell 7 also includes a second driver 3 and a push rod 4. The push rod 4 is connected to the output end of the second driver 3. Under the drive of the second driver 3, the push rod 4 can push the locking protrusion 115 into the receiving hole 116.

[0078] The push rod 4 can be a device for pushing the latch 115. The second driver 3 can be a device for providing driving power to the push rod 4, and the push rod 4 is driven to the output end of the second driver 3. Under the drive of the second driver 3, the push rod 4 can push the latch 115 into the receiving hole 116, so that the latch 115 releases its obstruction of the battery cell 7, making it easier for the battery cell 7 to be removed from the cavity 111.

[0079] Driven by the second driver 3, when the push rod 4 pushes the card protrusion 115 into the receiving hole 116, the first driver 2 can drive the carrier plate 12 to move along the first direction X towards the first opening 112, pushing the battery cell 7 in the cavity 111 out of the cavity 111, so that the battery cell 7 can be quickly removed from the cavity 111.

[0080] In some embodiments, the airtightness detection and protection mechanism for battery cell 7 further includes a third driver 5 and a suction cup 6, wherein the suction cup 6 is tractively connected to the output end of the third driver 5 and is used to adsorb the battery cell 7.

[0081] The suction cup 6 can be a device for adsorbing the battery cell 7. It can connect with the battery cell 7 by adsorbing the outer surface of the battery cell 7's shell. The third actuator 5 can be a device for providing driving power for the movement of the suction cup 6. By connecting the suction cup 6 to the output end of the third actuator 5, the suction cup 6 can transfer the adsorbed battery cell 7 under the drive of the third actuator 5. This allows the tested battery cell 7 to be quickly transferred away from the airtightness detection and protection mechanism, which helps to improve the efficiency of airtightness detection of the battery cell 7.

[0082] In some embodiments, reference Figure 6 The protective body 11 includes two first walls 117 arranged opposite each other along the second direction Y and two second walls 118 arranged opposite each other along the third direction Z. The second walls 118 are connected between the two first walls 117. The bearing plate 12 is connected to the first walls 117 and the second walls 118. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The area of ​​the first wall 117 is larger than the area of ​​the second wall 118, and the area of ​​the first wall 117 is larger than the area of ​​the bearing plate 12.

[0083] The first direction X, the second direction Y, and the third direction Z are arranged perpendicularly to each other. Two first walls 117 are arranged relatively spaced along the second direction Y, and two second walls 118 are arranged relatively spaced along the third direction Z. The second walls 118 are connected between the two first walls 117, so that the first walls 117 and the second walls 118 can be connected to form a square cylindrical protective body 11, so that the protective body 11 can be used for square batteries.

[0084] By setting the area of ​​the first wall 117 to be larger than the area of ​​the second wall 118, and setting the area of ​​the first wall 117 to be larger than the area of ​​the bearing plate 12, the area of ​​the first wall 117 is the largest area in the protective fixture 1. It can be adapted to the largest area in the battery cell 7 to protect the largest surface in the battery cell 7 shell. When the largest surface in the battery cell 7 shell bulges and deforms, it can be held and restricted by the first wall 117, reducing the possibility of damage due to excessive deformation.

[0085] In some embodiments, reference Figure 7 The protective body 11 has a first end face 119 at the end in the first direction X, and the protective body 11 is provided with an inlet ramp 1110, which is connected between the first end face 119 and the first opening 112.

[0086] The first end face 119 can be a plane at the end of the protective body 11 in the first direction X. The guide slope 1110 can be a slope provided on the protective body 11 to improve the smoothness of the battery cell 7 being inserted into the cavity 111. By connecting the guide slope 1110 between the first end face 119 and the first opening 112, the guide slope 1110 can play a guiding role during the process of the battery cell 7 being inserted into the cavity 111 from the first opening 112, thereby improving the smoothness of the battery cell 7 being inserted from the first opening 112.

[0087] In some embodiments, reference Figure 8 The inner surface of the cavity 111 is provided with a sliding coating 1111, and the friction coefficient of the sliding coating 1111 is less than the friction coefficient of the protective tooling 1.

[0088] The sliding coating 1111 can be a functional coating with a low coefficient of friction and good lubrication properties, which can reduce the frictional force experienced by the device when sliding on it. By providing the sliding coating 1111 on the inner surface of the cavity 111, the coefficient of friction of the sliding coating 1111 is less than that of the protective tooling 1, so that the setting of the sliding coating 1111 can reduce the frictional force experienced by the battery cell 7 when it is inserted into the cavity 111, as well as the frictional force experienced by the battery cell 7 when it is pushed out of the cavity 111, which is beneficial to improving the efficiency of the battery cell 7 in the cavity 111 for rapid entry and exit.

[0089] The coefficient of friction of the sliding coating 1111 can refer to the coefficient of dynamic friction of the surface of the sliding coating 1111; the coefficient of friction of the protective tooling 1 can refer to the coefficient of dynamic friction of the surface of the protective tooling 1.

[0090] For example, the sliding coating 1111 can be a polytetrafluoroethylene stainless steel coating, which not only makes the surface of the sliding coating 1111 smooth, but also makes the sliding coating 1111 have good corrosion resistance.

[0091] For example, the coefficient of kinetic friction of the surface of the sliding coating 1111 can be set to the range of 0.01-0.05.

[0092] Some embodiments of this application also provide a battery cell 7 airtightness testing device, which includes the battery cell 7 airtightness testing protection mechanism provided by any of the above technical solutions.

[0093] Some embodiments of this application provide a protective mechanism for airtightness testing of a battery cell 7, including a protective fixture 1, a first driver 2, a second driver 3, a push rod 4, a third driver 5, and a suction cup 6. The protective body 11 of the protective fixture 1 forms a cavity 111 for accommodating the battery cell 7. The cavity 111 has a first opening 112 and a second opening 113 at both ends in the first direction X. A support plate 12 can be placed in the second opening 113, and the support plate 12 is movably connected to the inner surface of the cavity 111 along the first direction X. The output end of the first driver 2 is connected to the support plate 12. The protective body 11 is provided with a suction cup 6. The inner surface of 111 has a protruding locking protrusion 115, which is closer to the first opening 112 than the second opening 113. The locking protrusion 115 and the support plate 12 can block the battery cell 7 in the cavity 111. Under the drive of the second driver 3, the push rod 4 can push the locking protrusion 115 into the receiving hole 116 provided in the protective body 11. The first driver 2 pushes the battery cell 7 in the cavity 111 out of the first opening 112 by driving the support plate 12. When the suction cup 6 adsorbs the battery cell 7, it can transfer the battery cell 7 from the airtightness detection and protection mechanism of the battery cell 7 under the drive of the third driver 5.

[0094] In the above structure, since the protective body 11 in the protective fixture 1 forms a cavity 111 for accommodating the battery cell 7, and the support plate 12 can block the second opening 113 of the cavity 111, when the battery cell 7, which is inserted into the cavity 111 through the first opening 112, expands due to inflation during the airtightness test, the outer shell of the expanded battery cell 7 will abut against the surfaces of the protective body 11 and the support plate 12 facing the cavity 111, thus mitigating the possibility of further deformation. Because the outer shell of the battery cell 7 can be blocked by the protective body 11 and the support plate 12 when it expands, a large area of ​​the outer shell of the battery cell 7 is protected by the protective fixture 1, so that the battery cell 7 is more comprehensively protected, reducing the possibility of damage to the battery cell 7 due to excessive deformation during the airtightness test.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell airtightness testing and protection mechanism, characterized in that, include: The protective fixture includes a protective body and a support plate. The protective body forms a cavity for accommodating a single battery cell. The cavity has a first opening and a second opening at both ends in a first direction. The support plate is capable of blocking the second opening.

2. The battery cell airtightness detection and protection mechanism according to claim 1, characterized in that, The support plate is movably connected to the inner surface of the cavity along the first direction. The battery cell airtightness detection and protection mechanism also includes a first driver, the output end of which is connected to the support plate.

3. The battery cell airtightness testing and protection mechanism according to claim 2, characterized in that, The support plate is provided with a through hole, which penetrates the support plate along the first direction.

4. The battery cell airtightness detection and protection mechanism according to claim 2 or 3, characterized in that, The protective fixture is provided with a limiting boss, which protrudes from the inner surface of the cavity. The limiting boss is closer to the second opening than the first opening, and the limiting boss is used to block the bearing plate.

5. The battery cell airtightness detection and protection mechanism according to claim 1, characterized in that, The protective body is provided with a latching protrusion that protrudes from the inner surface of the cavity. The latching protrusion is closer to the first opening than the second opening, and the latching protrusion can block the battery cell in the cavity.

6. The battery cell airtightness detection and protection mechanism according to claim 5, characterized in that, The card protrusion is provided with a guide slope, and the orientation of the guide slope is set at an acute angle to the orientation of the first opening.

7. The battery cell airtightness detection and protection mechanism according to claim 5 or 6, characterized in that, The protective body is provided with a receiving hole. A portion of the card protrusions are located in the receiving hole and connected to the bottom surface of the receiving hole through an elastic element, while another portion of the card protrusions extend from the receiving hole into the cavity.

8. The battery cell airtightness detection and protection mechanism according to claim 7, characterized in that, The battery cell airtightness detection and protection mechanism also includes a second driver and a push rod. The push rod is driven by the output end of the second driver. Under the drive of the second driver, the push rod can push the locking protrusion into the receiving hole.

9. The battery cell airtightness detection and protection mechanism according to claim 8, characterized in that, The battery cell airtightness detection and protection mechanism also includes a third driver and a suction cup. The suction cup is driven to the output end of the third driver and is used to adsorb the battery cell.

10. The battery cell airtightness detection and protection mechanism according to claim 1, characterized in that, The protective body includes two first walls arranged opposite each other along a second direction and two second walls arranged opposite each other along a third direction. The second walls are connected between the two first walls. The bearing plate is connected to the first walls and the second walls. The first direction, the second direction and the third direction are perpendicular to each other. The area of ​​the first wall is larger than the area of ​​the second wall, and the area of ​​the first wall is larger than the area of ​​the bearing plate.

11. The battery cell airtightness detection and protection mechanism according to claim 1, characterized in that, The protective body has a first end face at the end in the first direction, and the protective body is provided with an inlet inclined surface, which connects the first end face and the first opening.

12. The battery cell airtightness detection and protection mechanism according to claim 1, characterized in that, The inner surface of the cavity is provided with a sliding coating, and the coefficient of friction of the sliding coating is less than the coefficient of friction of the protective tooling.

13. A device for detecting the airtightness of a single battery cell, characterized in that, Includes the battery cell airtightness testing and protection mechanism as described in any one of claims 1-12.

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