Battery pressurizing device and battery production system

Abstract

The invention discloses a battery pressurizing device and a battery production system. The battery pressurizing device comprises a bearing mechanism and a plurality of pressurizing mechanisms, the multiple pressurizing mechanisms are arranged on the bearing mechanism and arranged in the first direction. Each pressurizing mechanism comprises a containing cavity and a first wall, the first wall is located on one side, in the first direction, of the containing cavity, the containing cavity is used for being communicated with external air conveying equipment, and the first wall is configured to be capable of expanding and deforming under the condition that the internal air pressure of the containing cavity reaches a threshold value.

Description

Technical Field

[0001] The present application relates to the field of battery production, and in particular to a battery pressurizing device and a battery production system. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In some production processes of battery cells, the battery cells need to be pressurized. Therefore, there is an urgent need to provide a device capable of pressurizing the battery cells. Summary of the invention

[0004] The present application provides a battery pressurizing device and a battery production system, which can improve the uniformity of the pressure on battery cells.

[0005] In a first aspect, the present application provides a battery pressurizing device, which includes a bearing mechanism and a plurality of pressurizing mechanisms. The plurality of pressurizing mechanisms are disposed on the bearing mechanism and arranged along a first direction. Each pressurizing mechanism includes a receiving cavity and a first wall, the first wall being located on one side of the receiving cavity along the first direction, the receiving cavity being used to communicate with an external gas transmission device, and the first wall being configured to expand and deform when the internal air pressure of the receiving cavity reaches a threshold value.

[0006] When it is necessary to pressurize the battery cells, multiple battery cells can be inserted between multiple pressurizing mechanisms. The gas transmission equipment inputs gas into the accommodating chamber of the pressurizing mechanism. As the internal air pressure of the accommodating chamber increases, the first wall gradually expands and deforms and squeezes the battery cells, thereby applying pressure to the battery cells. The embodiment of the present application can provide multiple pressure sites by setting multiple pressurizing mechanisms, thereby improving the uniformity of pressure on multiple battery cells; the battery cells are inserted between the pressurizing mechanisms, and the offset of the battery cells will be limited by the pressurizing mechanisms on both sides. Therefore, the embodiment of the present application can also reduce the offset of the battery cells when they are pressurized, and reduce the risk of misalignment between the battery cells and other components. The pressure applied by the pressurizing mechanism to the battery cells is related to the amount of gas provided by the gas transmission equipment. By adjusting the amount of gas input by the gas transmission equipment, the pressure applied by the pressurizing mechanism to the battery cells can be effectively controlled, thereby achieving controllability of the pressure.

[0007] In some embodiments, the pressurizing mechanism includes a substrate and a cover plate, the end surface of the substrate along the first direction has an opening, the cover plate covers the opening and forms a receiving cavity with the substrate. The cover plate includes a first wall, and the substrate is provided with a channel for connecting the receiving cavity with an external gas transmission device.

[0008] The provision of the cover plate can help achieve directional deformation of the pressurizing mechanism, so that the cover plate can effectively pressurize the battery cell. When the cover plate is worn, the cover plate can be replaced, thereby reducing the maintenance cost of the battery pressurizing device.

[0009] In some embodiments, the elastic modulus of the substrate is greater than that of the cover plate. The cover plate has good elasticity, and when the internal pressure in the accommodating cavity increases, the cover plate can be deformed quickly to transmit the pressure to the battery cell. The substrate has great strength and is not easily deformed, which can help achieve directional deformation of the pressurizing mechanism and increase the rate of increase of the internal pressure in the accommodating cavity.

[0010] In some embodiments, the material of the substrate includes at least one of metal and plastic. Metal and plastic are easy to process and obtain, which helps to reduce costs.

[0011] In some embodiments, the cover plate is made of an elastic material. The elastic material is easy to expand and deform, and the deformation can be restored. The cover plate is made of an elastic material, which can reduce the threshold requirement and can be used multiple times, thereby increasing the service life of the battery pressurizing device.

[0012] In some embodiments, the elastic material includes at least one of silicone and ethylene propylene rubber. These structural materials are easy to purchase, easy to process, and relatively low in price, which can save costs, and have stable structures and can be used in multiple processes.

[0013] In some embodiments, the cover plate is attached to the end surface of the substrate, which can increase the connection area between the cover plate and the substrate and improve the connection strength between the cover plate and the substrate. In other embodiments, the cover plate is accommodated in the opening, and the outer surface of the cover plate is flush with the end surface, which can reduce the space occupied by the pressurizing mechanism, reduce the risk of battery cells rubbing against the cover plate, reduce the wear of the cover plate, and increase the service life of the battery pressurizing device.

[0014] In some embodiments, the cover plate is bonded to the base plate. The bonding process is easy to implement and helps to seal the opening and reduce the risk of air leakage.

[0015] In some embodiments, the pressurizing mechanism includes a limiting protrusion connected to the substrate, and the limiting protrusion protrudes from the surface of the cover plate facing the part to be pressurized along the first direction. The limiting protrusion can limit the part to be pressurized when the battery cell is inserted between the substrates of the two pressurizing mechanisms, so that the part to be pressurized and the cover plate are opposite in the first direction. As an example, the part to be pressurized can be a battery cell.

[0016] In some embodiments, the bearing mechanism includes a bearing plate, and the plurality of pressure mechanisms are disposed on one side of the bearing plate along the second direction. The limiting protrusion includes a first limiting portion and two second limiting portions, and the two second limiting portions extend from two ends of the first limiting portion along the third direction, respectively, along the second direction toward a side away from the bearing plate; the first direction, the second direction, and the third direction are perpendicular to each other. The area enclosed by the first limiting portion and the two second limiting portions at least partially overlaps with the first wall in the first direction.

[0017] During assembly, the battery cell can be inserted between the base plates of the two pressurizing mechanisms along the second direction; the first limiting portion can support the battery cell and limit it in the second direction; the two second limiting portions can limit the battery cell in the third direction. When the battery cell is inserted into place, the battery cell can overlap with the first wall in the first direction, and when the first wall expands and deforms, the first wall can apply pressure to the battery cell.

[0018] In some embodiments, the limiting protrusion is detachably connected to the substrate.

[0019] The limiting protrusion can be used to limit the area of ​​expansion and deformation of the first wall. Different limiting protrusions can be replaced according to the size of battery cells of different specifications to adapt to the battery cells. The limiting protrusion is detachably connected to the base plate, so that the pressurizing mechanism can be quickly replaced, thereby increasing the scope of application of the battery pressurizing device.

[0020] In some embodiments, the substrate includes a second wall opposite to the first wall along a first direction. Under the same internal pressure, the first wall is more likely to expand and deform outward than the second wall.

[0021] In some embodiments, the battery pressurizing device includes pressurizing groups arranged along a first direction, each pressurizing group includes two pressurizing mechanisms, the covers of the two pressurizing mechanisms of the pressurizing group face each other along the first direction, and the battery cells are arranged between the covers of the two pressurizing mechanisms of the pressurizing group.

[0022] Each of the multiple pressurizing groups can independently pressurize the battery cells, and the pressurizing groups do not affect each other, which can improve the uniformity of the pressure on the battery cells, reduce the influence between the battery cells, and improve the pressure effect of the battery cells.

[0023] In some embodiments, the plurality of pressurizing mechanisms include two first pressurizing mechanisms and at least one second pressurizing mechanism, and the second pressurizing mechanism is disposed between the two first pressurizing mechanisms. The cover plate of the first pressurizing mechanism faces the second pressurizing mechanism along the first direction, and the substrate includes a second wall opposite to the first wall along the first direction. The substrate of the second pressurizing mechanism has openings on both end surfaces along the first direction, and the second pressurizing mechanism includes two cover plates, and the two cover plates respectively cover the two openings of the substrate.

[0024] The second pressurizing mechanism can apply pressure to the battery cells on both sides at the same time. Therefore, the above technical solution can reduce the total number of pressurizing mechanisms and simplify the structure of the battery pressurizing device.

[0025] In some embodiments, in the second pressurizing mechanism, two cover plates and a base plate enclose two accommodating chambers. The base plate of the second pressurizing mechanism includes a third wall, and the third wall separates the two accommodating chambers of the second pressurizing mechanism. The third wall can separate the two accommodating chambers, so that the second pressurizing mechanism can apply different pressures to the battery cells on both sides as needed, thereby improving the applicability of the battery pressurizing device.

[0026] In some embodiments, the battery pressurizing device further comprises at least one connector, and the accommodating chambers of the multiple pressurizing mechanisms are connected to the external gas transmission equipment through the at least one connector. By providing the connector, the connection between the gas transmission equipment and the multiple pressurizing mechanisms can be easily realized.

[0027] In some embodiments, the battery pressurizing device includes a plurality of connectors, each of which is connected to the accommodating chambers of two adjacent pressurizing mechanisms. The connectors can connect the accommodating chambers of two adjacent pressurizing mechanisms to the same gas transmission device to reduce the difference in internal air pressure of the accommodating chambers of the two pressurizing mechanisms, reduce the difference in force on both sides of the battery cell along the first direction, and improve the uniformity of force on the battery cell.

[0028] In some embodiments, the bearing mechanism includes a bearing plate, two end plates and a guide shaft. A plurality of pressure mechanisms are arranged on one side of the bearing plate along the second direction, and the second direction is perpendicular to the first direction. The two end plates are respectively connected to the two ends of the bearing plate along the first direction, and the plurality of pressure mechanisms are located between the two end plates along the first direction. The guide shaft extends along the first direction and connects the two end plates, and the pressure mechanism is slidably connected to the guide shaft along the first direction.

[0029] The above technical solution can move the pressurizing mechanism along the first direction as needed to change the spacing between the pressurizing mechanisms, so that the battery pressurizing device can adapt to battery cells of different thicknesses.

[0030] In some embodiments, the pressure mechanism is provided with a first slot and a second slot at both ends along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The bearing mechanism includes a plurality of guide shafts, at least one guide shaft passes through the first slot, and at least one guide shaft passes through the second slot.

[0031] By providing the first and second slots, the pressure mechanism can be slidably matched with the guide shaft along the first direction. The guide shaft embedded in the first slot and the guide shaft embedded in the second slot can limit the pressure mechanism in the second and third directions, thereby reducing the deviation of the pressure mechanism.

[0032] In some embodiments, the battery pressurizing device further includes a locking and unlocking mechanism, which is disposed on the pressurizing mechanism and is used to lock the pressurizing mechanism to the guide shaft or release the lock between the pressurizing mechanism and the guide shaft.

[0033] In some embodiments, the pressure mechanism is fixed to the support plate. When the pressure mechanism applies pressure to the battery cell, the support plate can limit the movement of the pressure mechanism along the first direction to reduce the risk of the pressure mechanism deviating in the first direction.

[0034] When the specifications of the battery cell change, such as when the thickness becomes larger or smaller, the locking and unlocking mechanism releases the lock between the pressurizing mechanism and the guide shaft, and then moves the pressurizing mechanism along the guide shaft. When the pressurizing mechanism moves to the set position, the pressurizing mechanism locks the pressurizing mechanism and the carrier plate. The embodiment of the present application can move the pressurizing mechanism along the first direction as needed to change the spacing between the pressurizing mechanisms, so that the battery pressurizing device can adapt to battery cells of different thicknesses.

[0035] In a second aspect, the present application provides a battery production system, which includes a battery pressurizing device and a gas delivery device provided in any embodiment of the first aspect, wherein the gas delivery device is connected to the containing chamber and is used to deliver or exhaust gas to the containing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0037] Figure 1 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application;

[0038] Figure 2 for Figure 1 An enlarged schematic diagram at the circle frame;

[0039] Figure 3 A schematic diagram of the structure of a pressurizing mechanism of a battery pressurizing device provided in some embodiments of the present application;

[0040] Figure 4 for Figure 3 Schematic cross-sectional view along line AA;

[0041] Figure 5 for Figure 3 A schematic cross-sectional view taken along line BB;

[0042] Figure 6 A schematic cross-sectional view of a pressurizing mechanism of a battery pressurizing device provided in some other embodiments of the present application;

[0043] Figure 7 A schematic front view of a battery pressurizing device provided in some embodiments of the present application;

[0044] Figure 8 for Figure 7 A test schematic diagram of a battery pressurizing device is shown;

[0045] Fig. 9 A schematic front view of a battery pressurizing device provided in some embodiments of the present application;

[0046] Fig.10 for Fig. 9 A cross-sectional schematic diagram of the second pressurizing mechanism shown;

[0047] Fig.11 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application;

[0048] Fig.12 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0049] In the drawings, the drawings are not necessarily drawn to scale.

[0050] Description of reference numerals:

[0051] 1. Battery pressurizing device; 2. Gas transmission equipment; 3. Battery cells; 4. Processing equipment;

[0052] 10. Pressurization group;

[0053] 11. bearing mechanism; 111. bearing plate; 112. end plate; 113. guide shaft;

[0054] 12. Pressurizing mechanism; 12a. First pressurizing mechanism; 12b. Second pressurizing mechanism;

[0055] 120, accommodating chamber; 1200, first wall; 1211, second wall; 1212, third wall;

[0056] 121, substrate; 121a, end surface; 121b, first slot; 121c, second slot; 121d, channel; 122, cover plate; 122a, outer surface; 123, limiting protrusion; 1231, first limiting portion; 1232, second limiting portion;

[0057] 13. Connector;

[0058] 14. Lock and unlock mechanism;

[0059] X, first direction; Z, second direction; Y, third direction. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0062] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0063] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0066] The term "plurality" used in the present application refers to two or more (including two).

[0067] With the development of battery technology, battery cells are used in more and more fields and are gradually replacing traditional petrochemical energy in the field of automotive power. Battery cells can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable battery cells, the active material can be activated by charging after discharge and continue to be used.

[0068] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0069] The production process of battery cells generally includes stirring, coating, rolling, slitting, assembly and formation, and the formation process is an extremely important process, which has a vital impact on the cycle performance of battery cells. The formation of battery cells can refer to the first charge and discharge process of battery cells after the battery cells are injected. For example, in lithium-ion battery cells, formation can activate the active substances in the battery cells and activate the lithium-ion batteries. At the same time, the lithium salt reacts with the electrolyte to form a solid electrolyte interface (SEI) film on the negative electrode side of the battery cell. This film can prevent the further occurrence of side reactions, thereby reducing the loss of active lithium in the battery cell. The quality of the SEI film has a great influence on the cycle life, initial capacity loss, and rate performance of the battery cell.

[0070] During the formation process, gas will be generated inside the battery cell. If the gas cannot be discharged, it will affect the cycle performance of the battery cell. For example, lithium ion battery cells will have problems such as interfacial lithium deposition. In addition, the gas will also cause the battery cell to expand and deform, resulting in the size specifications of the battery cell not meeting the standards.

[0071] Therefore, in the formation process, it is usually necessary to apply pressure to the battery cell to accelerate the discharge of gas, reduce the gas remaining inside the battery cell, reduce the deformation of the battery cell, and improve the appearance yield of the battery cell.

[0072] In some pressurizing devices, a pressure plate is usually used to squeeze a row of battery cells from one side to apply pressure to the battery cells. However, the pressure is gradually transmitted from the pressure plate to multiple battery cells, which will cause uneven pressure on multiple battery cells, and the pressure on battery cells far away from the pressure plate is difficult to control. In addition, when the pressure plate applies pressure, the offset of multiple battery cells in the arrangement direction will accumulate, causing a larger offset of the battery cell closest to the pressure plate, which will affect the connection between the battery cell and external equipment (such as the probe of the formation equipment).

[0073] In view of this, an embodiment of the present application provides a battery pressurizing device, which is provided with a pressurizing mechanism that can expand and deform under the action of air pressure, so as to apply pressure to the battery cell by utilizing the expansion and deformation of the pressurizing mechanism. Multiple pressurizing mechanisms can provide multiple pressurizing sites, thereby improving the uniformity of the pressure on the battery cell and reducing the displacement of the battery cell when it is pressurized. The pressure applied by the pressurizing mechanism to the battery cell is related to the air pressure applied externally. By adjusting the air pressure, the pressure applied by the pressurizing mechanism to the battery cell can be effectively controlled.

[0074] The battery pressurizing device disclosed in the embodiment of the present application can be applied to the battery formation process, and can also be applied to other processes of the battery. For example, the battery pressurizing device in the embodiment of the present application can also be used in the liquid injection process; specifically, in the liquid injection process, the liquid injection equipment injects the electrolyte into the interior of the battery cell at a high pressure and high speed, thereby causing the internal pressure of the battery cell to increase, and the battery pressurizing device in the embodiment of the present application can pressurize the battery cell from the outside to offset the internal pressure of the battery cell and reduce the deformation of the battery cell.

[0075] Of course, the battery pressurizing device of the embodiment of the present application can be used to pressurize battery cells, and can also be used to pressurize other parts to be pressurized in the battery production process.

[0076] Figure 1 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application; Figure 2 for Figure 1 An enlarged schematic diagram at the circle frame; Figure 3 A schematic diagram of the structure of a pressurizing mechanism of a battery pressurizing device provided in some embodiments of the present application; Figure 4 for Figure 3 Schematic cross-sectional view along line AA; Figure 5 for Figure 3 Schematic cross-sectional view along line BB.

[0077] Reference Figures 1 to 5 The battery pressurizing device 1 provided in the embodiment of the present application includes a carrying mechanism 11 and a plurality of pressurizing mechanisms 12. The plurality of pressurizing mechanisms 12 are disposed on the carrying mechanism 11 and arranged along the first direction X. Each pressurizing mechanism 12 includes a receiving chamber 120 and a first wall 1200, wherein the first wall 1200 is located on one side of the receiving chamber 120 along the first direction X; the receiving chamber 120 is used to communicate with the external gas transmission device 2, and the first wall 1200 is configured to be able to expand and deform when the internal air pressure of the receiving chamber 120 reaches a threshold value.

[0078] The battery pressurizing device 1 can be used to apply pressure to a component to be pressurized. As an example, the following description is made with the component to be pressurized being a battery cell 3.

[0079] The supporting mechanism 11 can be used to support multiple pressurizing mechanisms 12. As an example, when the battery cell 3 needs to be pressurized, the supporting mechanism 11 can be used to support the battery cell 3. Of course, the supporting mechanism 11 can directly support the battery cell 3 or indirectly support the battery cell 3 through other components (such as the pressurizing mechanism 12).

[0080] The pressing mechanism 12 may be fixedly connected to the supporting mechanism 11. Alternatively, the position of the pressing mechanism 12 on the supporting mechanism 11 is adjustable along the first direction X.

[0081] The pressurizing mechanism 12 may be an integrated component or may be formed by connecting a plurality of independent components.

[0082] The first wall 1200 of the pressurizing mechanism 12 may be a wall of the pressurizing mechanism 12 that can pressurize the battery cell 3 by expanding and deforming. The first wall 1200 may be a part of the peripheral wall surrounding the accommodating cavity 120. The pressurizing mechanism 12 may include one or more first walls 1200. The pressurizing mechanism 12 may include one or more accommodating cavities 120.

[0083] In some examples, the pressurizing mechanism 12 includes a first wall 1200. In other examples, the pressurizing mechanism 12 includes two first walls 1200, and the two first walls 1200 are respectively located on both sides of the accommodating cavity 120 along the first direction X. In still other examples, the pressurizing mechanism 12 includes two accommodating cavities 120 and two first walls 1200, the two first walls 1200 are spaced apart along the first direction X, and the two accommodating cavities 120 are located between the two first walls 1200 in the first direction X and are spaced apart.

[0084] The threshold value design may be different according to different design requirements. For example, the threshold value may depend on the material of the first wall 1200 .

[0085] The expansion deformation of the first wall 1200 may refer to the deformation of the first wall 1200 due to the expansion of the accommodation cavity 120 .

[0086] When the internal air pressure of the accommodating chamber 120 reaches a threshold value, the portion of the pressurizing mechanism 12 other than the first wall 1200 may or may not be deformed.

[0087] The accommodating chambers 120 of the multiple pressurizing mechanisms 12 may be connected to the same gas delivery device 2 or may be connected to different gas delivery devices 2 .

[0088] The gas delivery device 2 may be directly connected to the pressurizing mechanism 12 to communicate with the accommodating chamber 120 ; alternatively, the gas delivery device 2 may be indirectly connected to the pressurizing mechanism 12 via other components to communicate with the accommodating chamber 120 via the components.

[0089] The gas delivery device 2 may only input gas into the containing chamber 120. Alternatively, the gas delivery device 2 may both input gas into the containing chamber 120 and extract gas from the containing chamber 120.

[0090] Exemplarily, when the battery cells 3 need to be pressurized, multiple battery cells 3 may be inserted between multiple pressurizing mechanisms 12 , so that both sides of each battery cell 3 along the first direction X are provided with a pressurizing mechanism 12 .

[0091] Only one battery cell 3 may be inserted between two adjacent pressurizing mechanisms 12 , or two or more battery cells 3 may be inserted simultaneously. As an example, in the first direction X, adjacent battery cells 3 are separated by the pressurizing mechanisms 12 .

[0092] Among the two pressurizing mechanisms 12 located on both sides of the battery cell 3 and adjacent to the battery cell 3 , the first wall 1200 of only one pressurizing mechanism 12 may be opposite to the battery cell 3 , or the first walls 1200 of both pressurizing mechanisms 12 may be opposite to the battery cell 3 .

[0093] When it is necessary to pressurize the battery cell 3, multiple battery cells 3 can be inserted between multiple pressurizing mechanisms 12. The gas transmission device 2 inputs gas into the accommodating chamber 120 of the pressurizing mechanism 12. As the internal air pressure of the accommodating chamber 120 increases, the first wall 1200 gradually expands and deforms and squeezes the battery cell 3, thereby applying pressure to the battery cell 3. The embodiment of the present application can provide multiple pressurizing sites by setting multiple pressurizing mechanisms 12, thereby improving the uniformity of the pressure on multiple battery cells 3; the battery cell 3 is inserted between the pressurizing mechanisms 12, and the offset of the battery cell 3 will be limited by the pressurizing mechanisms 12 on both sides. Therefore, the embodiment of the present application can also reduce the offset of the battery cell 3 when it is pressurized, and reduce the risk of misalignment between the battery cell 3 and other components. The pressure of the pressurizing mechanism 12 on the battery cell 3 is related to the amount of gas provided by the gas transmission device 2. By adjusting the amount of gas input by the gas transmission device 2, the pressure of the pressurizing mechanism 12 on the battery cell 3 can be effectively controlled, thereby achieving controllability of the pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0094] The method of using gas pressurization is simple, easy to operate and low-cost; in addition, gas pressurization involves fewer equipment, which can reduce the floor space and save plant layout space.

[0095] In some embodiments, the expansion deformation of the first wall 1200 is an elastically recoverable deformation.

[0096] In some embodiments, the battery pressurizing device 1 may be used in a battery formation process to squeeze out the gas inside the battery cell 3 during the formation process.

[0097] In some embodiments, the battery pressurizing device 1 may be used in a battery injection process to offset the positive pressure applied by the injection equipment to the inside of the battery cell 3 during the injection process, thereby reducing deformation of the outer shell of the battery cell 3 .

[0098] In some embodiments, after the pressurization-related processes are completed, the gas in the receiving chamber 120 of the pressurization mechanism 12 is released. At this time, the battery pressurization device 1 of the embodiment of the present application can also be used as a conventional tray for carrying battery cells 3.

[0099] In some embodiments, the battery pressurizing device 1 can also be used in scenarios where the battery cell 3 is subjected to long-term charge and discharge cycles. In these scenarios, the pressurizing mechanism 12 pressurizes the battery cell 3 so that the positive and negative electrodes of the battery cell 3 fit closely with the separator, thereby improving the uniformity of the interface reaction and increasing the service life of the battery.

[0100] In some embodiments, the pressurizing mechanism 12 includes a substrate 121 and a cover plate 122. The end surface 121a of the substrate 121 along the first direction X has an opening, and the cover plate 122 covers the opening and encloses the substrate 121 to form a receiving cavity 120. The cover plate 122 includes a first wall 1200. The substrate 121 is provided with a channel 121d for connecting the receiving cavity 120 with an external gas transmission device.

[0101] As an example, the substrate 121 has two end surfaces 121a arranged opposite to each other along the first direction X. In some examples, one end surface 121a of the substrate 121 has an opening, and the pressurizing mechanism 12 includes a cover plate 122. In other examples, both end surfaces 121a of the substrate 121 have openings, and the pressurizing mechanism 12 includes two cover plates 122, and the two cover plates 122 cover the openings on the two end surfaces 121a, respectively.

[0102] The materials of the substrate 121 and the cover 122 may be the same or different.

[0103] In some examples, the cover plate 122 may be embedded in the opening and connected to the base plate 121. In other examples, the area of ​​the cover plate 122 may be larger than the area of ​​the opening, and the cover plate 122 may be attached to the end surface 121a.

[0104] The embodiment of the present application provides the cover plate 122, which can help achieve directional deformation of the pressurizing mechanism 12, so that the cover plate 122 can effectively pressurize the battery cell 3. When the cover plate 122 is worn, the cover plate 122 can be replaced, thereby reducing the maintenance cost of the battery pressurizing device 1.

[0105] By disposing the channel 121 d on the substrate 121 , the risk of interference between the pipeline of the gas transmission device 2 and the battery cell 3 can be reduced.

[0106] In some embodiments, the elastic modulus of the substrate 121 is greater than the elastic modulus of the cover plate 122 .

[0107] The cover plate 122 has good elasticity, and when the internal pressure in the accommodating chamber 120 increases, the cover plate 122 can be deformed quickly to transmit the pressure to the battery cell 3. The base plate 121 has great strength and is not easily deformed, which can help to achieve directional deformation of the pressurizing mechanism 12 and increase the rate of increase of the internal pressure in the accommodating chamber 120.

[0108] The substrate 121 has high strength. When the internal pressure of the accommodating chamber 120 increases, the deformation of the channel 121d is small, which can reduce the risk of sealing failure at the connection between the channel 121d and other components.

[0109] In some embodiments, the material of the substrate 121 includes at least one of metal and plastic.

[0110] Optionally, the material of the substrate 121 includes metal, including but not limited to aluminum, aluminum alloy, stainless steel, nickel-plated steel, etc.

[0111] Optionally, the material of the substrate 121 may include any type of high temperature resistant and non-deformable engineering plastics, such as polyimide, polyphenylene ether resin, and polyetheretherketone.

[0112] Optionally, the material of the substrate 121 may include general plastic with good mechanical strength, such as polypropylene or polyethylene.

[0113] Metals and plastics are easy to process and obtain, which helps to reduce costs.

[0114] In some embodiments, the cover plate 122 is made of an elastic material. The elastic material is easy to expand and deform, and the deformation can be restored. The cover plate 122 is made of an elastic material, which can reduce the threshold requirement and can be used multiple times, thereby increasing the service life of the battery pressurizing device 1.

[0115] In some embodiments, the elastic material includes rubber. Optionally, the elastic material includes at least one of silicone and ethylene propylene rubber. Optionally, the ethylene propylene rubber includes ethylene propylene diene monomer rubber.

[0116] These structural materials are easy to purchase, easy to process, and relatively low in price, which can save costs. They also have stable structures and can be used in multiple processes.

[0117] In some embodiments, the cover plate 122 is bonded to the substrate 121. In some examples, the cover plate 122 is bonded to the substrate 121 by an adhesive. In other examples, the cover plate 122 is bonded to the substrate 121 by a lamination process or a vulcanization process.

[0118] The bonding process is easy to implement and helps to seal the opening, reducing the risk of air leakage.

[0119] In some embodiments, the cover plate 122 is received in the opening, and an outer surface 122 a of the cover plate 122 is flush with the end surface 121 a .

[0120] The embodiment of the present application can reduce the space occupied by the pressurizing mechanism 12. In addition, when the battery cells 3 are inserted between the pressurizing mechanisms 12, the embodiment of the present application can reduce the risk of the battery cells 3 rubbing against the cover plate 122, reduce the wear of the cover plate 122, and increase the service life of the battery pressurizing device 1.

[0121] In some embodiments, the pressurizing mechanism 12 includes a limiting protrusion 123 connected to the base plate 121 , and the limiting protrusion 123 protrudes from the surface of the cover plate 122 facing the part to be pressurized (ie, the outer surface 122a of the cover plate) along the first direction X. As an example, the part to be pressurized may be a battery cell 3 .

[0122] The limiting protrusion 123 and the base plate 121 may be an integral part or may be independent parts.

[0123] The limiting protrusion 123 may be detachably connected to the base plate 121 , or may be non-detachably connected to the base plate 121 .

[0124] The number of the limiting protrusion 123 may be one or more.

[0125] The limiting protrusion 123 can limit the position of the part to be pressurized when the part to be pressurized is inserted between the base plates 121 of the two pressurizing mechanisms 12 , so that the part to be pressurized and the cover plate 122 are opposite to each other in the first direction X.

[0126] In some embodiments, the carrying mechanism 11 includes a carrying plate 111, and the plurality of pressing mechanisms 12 are disposed on one side of the carrying plate 111 along a second direction Z. The second direction Z is perpendicular to the first direction X. Optionally, the second direction Z is parallel to the vertical direction.

[0127] The supporting plate 111 can be used to support the pressurizing mechanism 12 and the battery cells 3 .

[0128] In some embodiments, the limiting protrusion 123 includes a first limiting portion 1231 and two second limiting portions 1232, and the two second limiting portions 1232 extend from both ends of the first limiting portion 1231 along the third direction Y, respectively, along the second direction Z toward a side away from the carrying plate 111. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other. The area surrounded by the first limiting portion 1231 and the two second limiting portions 1232 at least partially overlaps with the first wall 1200 in the first direction X.

[0129] During assembly, the battery cell 3 can be inserted between the base plates 121 of the two pressurizing mechanisms 12 along the second direction Z; the first limiting portion 1231 can support the battery cell 3 and limit it in the second direction Z; the two second limiting portions 1232 can limit the battery cell 3 in the third direction Y. When the battery cell 3 is inserted into place, the battery cell 3 can overlap with the first wall 1200 in the first direction X, and when the first wall 1200 expands and deforms, the first wall 1200 can apply pressure to the battery cell 3.

[0130] Exemplarily, the limiting protrusion 123 forms a U-shaped frame.

[0131] In some embodiments, the limiting protrusions 123 of the two pressing mechanisms 12 located on both sides of the battery cell 3 are arranged opposite to each other along the first direction X.

[0132] In some embodiments, the first limiting portion 1231 of the limiting protrusion 123 may also be omitted. In this case, the supporting plate 111 may support the battery cell 3 .

[0133] In some embodiments, the limiting protrusion 123 is detachably connected to the base plate 121. Optionally, the limiting protrusion 123 can be detachably connected to the base plate 121 by fasteners, snap-fit ​​or other connection methods.

[0134] The limiting protrusion 123 can be used to limit the area of ​​expansion and deformation of the first wall 1200. In the embodiment of the present application, different limiting protrusions 123 can be replaced according to the size of the battery cells 3 of different specifications, so as to adapt to the battery cells 3. The limiting protrusion 123 is detachably connected to the base plate 121, so that the pressurizing mechanism 12 can be quickly replaced, thereby improving the application range of the battery pressurizing device 1.

[0135] In some embodiments, the limiting protrusion 123 may be connected to the base plate 121 by screws.

[0136] In some embodiments, the limiting protrusion 123 is non-detachably connected to the substrate 121. For example, the limiting protrusion 123 is connected to the substrate 121 by bonding, welding or other methods.

[0137] In some embodiments, the limiting protrusion 123 may not be connected to the base plate 121. For example, the limiting protrusion 123 may also be directly disposed on the supporting plate 111.

[0138] Optionally, the limiting protrusion 123 may be fixed on the supporting plate 111 by a fastener.

[0139] In some embodiments, the substrate 121 includes a second wall 1211 opposite to the first wall 1200 along the first direction X.

[0140] In the first direction X, the accommodating cavity 120 is located between the first wall 1200 and the second wall 1211. Under the same internal pressure, the first wall 1200 is more likely to expand and deform outward than the second wall 1211.

[0141] The substrate 121 forms a second wall 1211 to improve sealing performance.

[0142] In some embodiments, the battery pressurizing device 1 further includes at least one connector 13 , and the accommodating chambers 120 of the plurality of pressurizing mechanisms 12 are connected to the external gas transmission device 2 via the at least one connector 13 .

[0143] There may be one or more connectors 13. In some examples, there is one connector 13, and one connector 13 is simultaneously connected to the accommodating chambers 120 of multiple pressurizing mechanisms 12. In other examples, there are multiple connectors 13, each connector 13 is connected to at least one accommodating chamber 120 of the pressurizing mechanism 12, and different connectors 13 are connected to different accommodating chambers 120.

[0144] The multiple connectors 13 can be connected to the same gas delivery device 2 or to different gas delivery devices 2 .

[0145] By providing the joint 13 , the connection between the gas delivery device 2 and a plurality of pressurizing mechanisms 12 can be easily achieved.

[0146] In some embodiments, the battery pressurizing device 1 includes a plurality of connectors 13 , and each connector 13 is connected to the accommodating cavities 120 of two adjacent pressurizing mechanisms 12 .

[0147] Two pressurizing mechanisms 12 connected to one connector 13 can apply pressure to the same battery cell 3 .

[0148] The connector 13 can connect the accommodating cavities 120 of two adjacent pressurizing mechanisms 12 to the same gas transmission device 2 to reduce the difference in internal air pressure of the accommodating cavities 120 of the two pressurizing mechanisms 12, reduce the difference in force on both sides of the battery cell 3 along the first direction X, and improve the uniformity of force on the battery cell 3.

[0149] In some embodiments, multiple connectors 13 are used to connect to the same gas transmission device 2, so that the accommodating cavities 120 of multiple pressurizing mechanisms 12 can be connected in parallel, thereby improving the consistency of the internal pressure of the accommodating cavities 120 of the multiple pressurizing mechanisms 12.

[0150] In some embodiments, the bearing mechanism 11 includes a bearing plate 111, two end plates 112, and a guide shaft 113. A plurality of pressurizing mechanisms 12 are disposed on one side of the bearing plate 111 along the second direction Z, and the second direction Z is perpendicular to the first direction X. The two end plates 112 are respectively connected to the two ends of the bearing plate 111 along the first direction X, and the plurality of pressurizing mechanisms 12 are located between the two end plates 112 along the first direction X. The guide shaft 113 extends along the first direction X and connects the two end plates 112, and the pressurizing mechanisms 12 and the guide shaft 113 are slidably connected along the first direction X.

[0151] The number of the guide shaft 113 may be one or more.

[0152] In the embodiment of the present application, the pressurizing mechanism 12 can be moved along the first direction X as needed to change the spacing between the pressurizing mechanisms 12 , so that the battery pressurizing device 1 can adapt to battery cells 3 of different thicknesses.

[0153] In some embodiments, the pressure mechanism 12 is fixed to the carrier plate 111. Optionally, the pressure mechanism 12 is fixed to the carrier plate 111 by fastener connection, clamping or other methods. Optionally, the pressure mechanism 12 is fixed to the carrier plate 111 by screws or buckles.

[0154] When the pressing mechanism 12 applies pressure to the battery cell 3 , the carrying plate 111 can limit the movement of the pressing mechanism 12 along the first direction X to reduce the risk of the pressing mechanism 12 being offset in the first direction X.

[0155] In some embodiments, when the specifications of the battery cell 3 are changed, such as when the thickness becomes larger or smaller, the fixation between the pressurizing mechanism 12 and the carrier plate 111 can be released first (for example, by removing the screws), and then the pressurizing mechanism 12 is moved along the guide shaft 113. When the pressurizing mechanism 12 moves to the set position, the pressurizing mechanism 12 and the carrier plate 111 are fixed again.

[0156] In some embodiments, the pressure mechanism 12 is provided with a first slot 121b and a second slot 121c at both ends along the third direction Y, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other. The support mechanism 11 includes a plurality of guide shafts 113, at least one guide shaft 113 passes through the first slot 121b, and at least one guide shaft 113 passes through the second slot 121c.

[0157] By providing the first slot 121b and the second slot 121c, the pressurizing mechanism 12 can be slidably matched with the guide shaft 113 along the first direction X. The guide shaft 113 embedded in the first slot 121b and the guide shaft 113 embedded in the second slot 121c can limit the pressurizing mechanism 12 in the second direction Z and the third direction Y, thereby reducing the deviation of the pressurizing mechanism 12.

[0158] In some embodiments, the first card slot 121 b and the second card slot 121 c are disposed on the substrate 121 .

[0159] In some embodiments, there are two first card slots 121b, and the two first card slots 121b are arranged along the second direction Z; there are two second card slots 121c, and the two second card slots 121c are arranged along the second direction Z.

[0160] There are four guide shafts 113 , two of which pass through the two first slots 121 b respectively, and the other two guide shafts 113 pass through the two second slots 121 c respectively.

[0161] Figure 6 Schematic cross-sectional view of a pressurizing mechanism of a battery pressurizing device provided in some other embodiments of the present application.

[0162] like Figure 6 As shown, in some embodiments, the cover plate 122 is attached to the end surface 121a of the base plate 121. Attachment may refer to affixing and connecting.

[0163] Optionally, the cover plate 122 is bonded to the end surface 121 a.

[0164] In the embodiment of the present application, the cover plate 122 may have a larger area. Attaching the cover plate 122 to the end surface 121a can increase the connection area between the cover plate 122 and the substrate 121, improve the connection strength between the cover plate 122 and the substrate 121, reduce the risk of separation of the cover plate 122 and the substrate 121 under the action of internal pressure, and extend the service life of the battery pressurizing device 1.

[0165] Figure 7 A schematic front view of a battery pressurizing device provided in some embodiments of the present application; Figure 8 for Figure 7 Schematic diagram of the test of the battery pressurization device shown.

[0166] like Figures 3 to 8 As shown, in some embodiments, the battery pressurizing device 1 includes a pressurizing group 10 arranged along a first direction X, and each pressurizing group 10 includes two pressurizing mechanisms 12. The cover plates 122 of the two pressurizing mechanisms 12 of the pressurizing group 10 face each other along the first direction X, and the battery cell 3 is arranged between the cover plates 122 of the two pressurizing mechanisms 12 of the pressurizing group 10.

[0167] In the embodiment of the present application, each of the multiple pressurizing groups 10 can independently pressurize the battery cell 3, and the pressurizing groups 10 do not affect each other. This can improve the uniformity of the pressure on the battery cell 3, reduce the influence between the battery cells 3, and improve the pressure effect of the battery cell 3.

[0168] In some embodiments, in two adjacent pressurizing groups 10, the pressurizing mechanism 12 of one pressurizing group 10 may offset the pressurizing mechanism 12 of another pressurizing group 10. The embodiments of the present application may improve space utilization.

[0169] In some embodiments, the limiting protrusions 123 of the two pressurizing mechanisms 12 of the pressurizing group 10 are opposite to each other along the first direction X. Optionally, the limiting protrusions 123 of the two pressurizing mechanisms 12 of the pressurizing group 10 enclose a space for accommodating the battery cell 3 .

[0170] In some embodiments, the substrate 121 includes a second wall 1211 opposite to the first wall 1200 along the first direction X. In the pressurizing group 10 , the second walls 1211 of the substrates 121 of the two pressurizing mechanisms 12 are disposed opposite to each other along the first direction X.

[0171] In two adjacent pressurizing groups 10 , the second wall 1211 of the base plate 121 of the pressurizing mechanism 12 of one pressurizing group 10 faces the second wall 1211 of the base plate 121 of the pressurizing mechanism 12 of the other pressurizing group 10 in the first direction X.

[0172] The second wall 1211 has a larger elastic modulus than the first wall 1200 , and deforms less under the action of the internal air pressure, which can reduce the risk of the second walls 1211 of the two pressurizing groups 10 being squeezed against each other.

[0173] Fig. 9 A schematic front view of a battery pressurizing device provided in some embodiments of the present application; Fig.10 for Fig. 9 A schematic cross-sectional view of the second pressurizing mechanism is shown.

[0174] like Fig. 9 and Fig.10 As shown, in some embodiments, the plurality of pressurizing mechanisms 12 include two first pressurizing mechanisms 12a and at least one second pressurizing mechanism 12b, and the second pressurizing mechanism 12b is disposed between the two first pressurizing mechanisms 12a. The cover plate 122 of the first pressurizing mechanism 12a faces the second pressurizing mechanism 12b along the first direction X, and the substrate 121 includes a second wall 1211 opposite to the first wall 1200 along the first direction X. Both end surfaces 121a of the substrate 121 of the second pressurizing mechanism 12b along the first direction X are provided with openings, and the second pressurizing mechanism 12b includes two cover plates 122, and the two cover plates 122 cover the two openings of the substrate 121 respectively.

[0175] The second pressurizing mechanism 12b may be one or more. Optionally, the second pressurizing mechanism 12b may be more than one.

[0176] The first pressurizing mechanism 12a includes a cover plate 122 , only one side of which can be used to press the battery cell 3 . The second pressurizing mechanism 12b includes two cover plates 122 , both sides of which along the first direction X can be used to press the battery cell 3 .

[0177] In some examples, the second pressurizing mechanism 12b may include a receiving chamber 120, and two cover plates 122 are located on both sides of the receiving chamber 120 and are used to close the receiving chamber 120. In an alternative example, the second pressurizing mechanism 12b may include two receiving chambers 120, and the two cover plates 122 correspond to the two receiving chambers 120 respectively.

[0178] The second pressurizing mechanism 12 b can apply pressure to the battery cells 3 on both sides at the same time. Therefore, the embodiment of the present application can reduce the total number of pressurizing mechanisms 12 and simplify the structure of the battery pressurizing device 1 .

[0179] In some embodiments, in the second pressurizing mechanism 12b, two cover plates 122 and a base plate 121 enclose two accommodating chambers 120. The base plate 121 of the second pressurizing mechanism 12b includes a third wall 1212, which separates the two accommodating chambers 120 of the second pressurizing mechanism 12b.

[0180] The third wall 1212 can separate the two accommodating chambers 120 , so that the second pressurizing mechanism 12 b can apply different pressures to the battery cells 3 on both sides as needed, thereby improving the applicability of the battery pressurizing device 1 .

[0181] In some embodiments, the two accommodating chambers 120 of the second pressurizing mechanism 12 b may be connected to different joints 13 .

[0182] In some embodiments, the second pressing mechanism 12 b includes two limiting protrusions 123 , and the two limiting protrusions 123 are respectively located on two sides of the substrate 121 along the first direction X.

[0183] Fig.11 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application.

[0184] like Fig.11 As shown, in some embodiments, the battery pressurizing device 1 further includes a locking and unlocking mechanism 14 , which is disposed on the pressurizing mechanism 12 and is used to lock the pressurizing mechanism 12 to the guide shaft 113 or unlock the pressurizing mechanism 12 and the guide shaft 113 .

[0185] When the specification of the battery cell 3 changes, for example, when the thickness becomes larger or smaller, the locking and unlocking mechanism 14 releases the lock between the pressurizing mechanism 12 and the guide shaft 113, and then moves the pressurizing mechanism 12 along the guide shaft 113. When the pressurizing mechanism 12 moves to the set position, the pressurizing mechanism 12 locks the pressurizing mechanism 12 with the carrier plate 111. The embodiment of the present application can move the pressurizing mechanism 12 along the first direction X as needed to change the spacing between the pressurizing mechanisms 12, so that the battery pressurizing device 1 can adapt to battery cells 3 of different thicknesses.

[0186] Optionally, in the case of providing the locking and unlocking mechanism 14 , the connection structure between the pressing mechanism 12 and the carrying plate 111 may be omitted.

[0187] In some embodiments, the locking and unlocking mechanism 14 is disposed on the substrate 121 .

[0188] In some embodiments, the locking and unlocking mechanism 14 may include a bolt.

[0189] Fig.12 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0190] like Fig.12 As shown, the embodiment of the present application further provides a battery production system, which includes the battery pressurizing device 1 provided in any of the above embodiments and a gas delivery device 2. The gas delivery device 2 is connected to the accommodating chamber 120 and is used to deliver or exhaust gas to the accommodating chamber 120.

[0191] In some embodiments, the gas delivery device 2 includes a gas delivery pipeline. In some embodiments, a plurality of joints 13 are connected in parallel to the gas delivery pipeline, so that the accommodating chambers 120 of the plurality of pressurizing mechanisms 12 are connected in parallel.

[0192] In some embodiments, the battery production system further includes a processing device 4 for performing specific processing on the battery cells 3 .

[0193] For example, in some examples, the processing device 4 may be a negative pressure device, which is used to extract the gas inside the battery cell 3 during the formation process of the battery cell 3.

[0194] In other examples, the processing device 4 may be a liquid injection device, which can be used to inject electrolyte into the interior of the battery cell 3 .

[0195] Reference Figures 1 to 5 Some embodiments of the present application provide a battery pressurizing device 1, which includes a supporting mechanism 11, a plurality of pressurizing mechanisms 12 and a plurality of joints 13.

[0196] The bearing mechanism 11 includes a bearing plate 111, two end plates 112 and a guide shaft 113. The plurality of pressurizing mechanisms 12 are arranged along the first direction X, and the bearing plate 111 is on one side along the second direction Z, and the second direction Z is perpendicular to the first direction X. The two end plates 112 are respectively connected to the two ends of the bearing plate 111 along the first direction X, and the plurality of pressurizing mechanisms 12 are located between the two end plates 112 along the first direction X. The guide shaft 113 extends along the first direction X and connects the two end plates 112, and the pressurizing mechanisms 12 and the guide shaft 113 are slidably connected along the first direction X.

[0197] The pressurizing mechanism 12 includes a substrate 121 and a cover plate 122. The end surface 121a of the substrate 121 along the first direction X has an opening. The cover plate 122 covers the opening and encloses the substrate 121 to form a receiving cavity 120. The elastic modulus of the substrate 121 is greater than the elastic modulus of the cover plate 122. The receiving cavity 120 is used to communicate with the external gas transmission device 2. The cover plate 122 is configured to expand and deform when the internal air pressure of the receiving cavity 120 reaches a threshold value, so as to apply pressure to the battery cell 3.

[0198] The pressurizing mechanism 12 further includes a limiting protrusion 123 connected to the base plate 121, and the limiting protrusion 123 protrudes from the surface of the cover plate 122 facing the battery cell 3 along the first direction X. The limiting protrusion 123 includes a first limiting portion 1231 and two second limiting portions 1232, and the two second limiting portions 1232 extend from the two ends of the first limiting portion 1231 along the third direction Y, respectively, along the second direction Z toward the side away from the carrier plate 111. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other. The area enclosed by the first limiting portion 1231 and the two second limiting portions 1232 at least partially overlaps with the first wall 1200 in the first direction X.

[0199] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present 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 pressurizing device, characterized in that: include: Carrying mechanism; as well as A plurality of pressurizing mechanisms are provided on the supporting mechanism and arranged along a first direction, each of the pressurizing mechanisms comprises a accommodating chamber and a first wall, the first wall is located on one side of the accommodating chamber along the first direction, the accommodating chamber is used to communicate with an external gas transmission device, and the first wall is configured to be able to expand and deform when the internal air pressure of the accommodating chamber reaches a threshold value.

2. The battery pressurizing device according to claim 1, characterized in that: The pressurizing mechanism comprises a base plate and a cover plate, the end surface of the base plate along the first direction has an opening, the cover plate covers the opening and encloses the base plate to form the accommodating cavity; The cover plate includes the first wall, and the base plate is provided with a channel for connecting the accommodating cavity with external gas transmission equipment.

3. The battery pressurizing device according to claim 2, characterized in that: The elastic modulus of the substrate is greater than the elastic modulus of the cover plate.

4. The battery pressurizing device according to claim 3, characterized in that: The material of the substrate includes at least one of metal and plastic.

5. The battery pressurizing device according to claim 3 or 4, characterized in that: The material of the cover plate includes elastic material.

6. The battery pressurizing device according to claim 5, characterized in that: The elastic material includes at least one of silicone rubber and ethylene propylene rubber.

7. The battery pressurizing device according to any one of claims 2 to 6, characterized in that: The cover plate is attached to the end surface of the substrate; or The cover plate is accommodated in the opening, and the outer surface of the cover plate is flush with the end surface.

8. The battery pressurizing device according to any one of claims 2 to 7, characterized in that: The cover plate is bonded to the substrate.

9. The battery pressurizing device according to any one of claims 2 to 8, characterized in that: The pressurizing mechanism comprises a limiting protrusion connected to the base plate, and the limiting protrusion protrudes from a surface of the cover plate facing the part to be pressurized along the first direction.

10. The battery pressurizing device according to claim 9, characterized in that: The bearing mechanism comprises a bearing plate, and the plurality of pressurizing mechanisms are arranged on one side of the bearing plate along the second direction; The limiting protrusion comprises a first limiting portion and two second limiting portions, wherein the two second limiting portions extend from two ends of the first limiting portion along the third direction and extend along the second direction toward a side away from the carrying plate; the first direction, the second direction and the third direction are perpendicular to each other; An area enclosed by the first limiting portion and the two second limiting portions at least partially overlaps with the first wall in the first direction.

11. The battery pressurizing device according to claim 9 or 10, characterized in that: The limiting protrusion is detachably connected to the base plate.

12. The battery pressurizing device according to any one of claims 2 to 11, characterized in that: The base plate includes a second wall opposite to the first wall along the first direction.

13. The battery pressurizing device according to claim 12, characterized in that: The battery pressurizing device comprises a pressurizing group arranged along the first direction, each of the pressurizing groups comprises two of the pressurizing mechanisms; The cover plates of the two pressurizing mechanisms of the pressurizing group face each other along the first direction, and a battery cell is arranged between the cover plates of the two pressurizing mechanisms of the pressurizing group.

14. The battery pressurizing device according to any one of claims 2 to 11, characterized in that: The plurality of pressurizing mechanisms include two first pressurizing mechanisms and at least one second pressurizing mechanism, wherein the second pressurizing mechanism is disposed between the two first pressurizing mechanisms; The cover plate of the first pressing mechanism faces the second pressing mechanism along the first direction, and the base plate includes a second wall opposite to the first wall along the first direction; The two end surfaces of the substrate of the second pressurizing mechanism along the first direction are both provided with openings, and the second pressurizing mechanism comprises two cover plates, and the two cover plates respectively cover the two openings of the substrate.

15. The battery pressurizing device according to claim 14, characterized in that: In the second pressurizing mechanism, the two cover plates and the base plate enclose two accommodating cavities; The base plate of the second pressurizing mechanism includes a third wall, and the third wall separates the two accommodating chambers of the second pressurizing mechanism.

16. The battery pressurizing device according to any one of claims 1 to 15, characterized in that: The battery pressurizing device further comprises at least one connector, and the accommodating chambers of the plurality of pressurizing mechanisms are connected to external gas transmission equipment via the at least one connector.

17. The battery pressurizing device according to claim 16, characterized in that: The battery pressurizing device comprises a plurality of the connectors, each of which is connected to the accommodating chambers of two adjacent pressurizing mechanisms.

18. The battery pressurizing device according to any one of claims 1 to 17, characterized in that: The carrying mechanism comprises: A carrying plate, wherein the plurality of pressurizing mechanisms are arranged on one side of the carrying plate along a second direction, wherein the second direction is perpendicular to the first direction; two end plates, respectively connected to two ends of the bearing plate along the first direction, the plurality of pressurizing mechanisms being located between the two end plates along the first direction; and The guide shaft extends along the first direction and connects the two end plates, and the pressurizing mechanism is slidably connected to the guide shaft along the first direction.

19. The battery pressurizing device according to claim 18, characterized in that: The pressurizing mechanism is provided with a first card slot and a second card slot at two ends along the third direction, respectively, and the first direction, the second direction and the third direction are perpendicular to each other; The bearing mechanism includes a plurality of guide shafts, at least one guide shaft passes through the first slot, and at least one guide shaft passes through the second slot.

20. The battery pressurizing device according to claim 18 or 19, characterized in that: The battery pressurizing device further comprises a locking and unlocking mechanism, which is arranged on the pressurizing mechanism and is used to lock the pressurizing mechanism to the guide shaft or unlock the pressurizing mechanism and the guide shaft.

21. The battery pressurizing device according to any one of claims 18 to 20, characterized in that: The pressing mechanism is fixed to the carrying plate.

22. A battery production system, characterized in that: include: The battery pressurizing device according to any one of claims 1 to 21; as well as The gas delivery equipment is connected to the accommodating chamber and is used for delivering or extracting gas from the accommodating chamber.

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