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, a first pressurizing plate and a second pressurizing plate, the first pressurizing plate and the second pressurizing plate are arranged on the bearing mechanism and are opposite to each other along a first direction, and the first pressurizing plate and the second pressurizing plate can oppositely move along the first direction so as to apply pressure to the battery monomers arranged between the first pressurizing plate and the second pressurizing plate from two sides.

Description

Technical Field

[0001] The present application relates to the field of batteries, 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 apply pressure to a battery cell from both sides.

[0005] In a first aspect, an embodiment of the present application provides a battery pressurizing device, which includes a supporting mechanism, a first pressurizing plate, and a second pressurizing plate. The first pressurizing plate and the second pressurizing plate are arranged on the supporting mechanism and are opposite to each other along a first direction. The first pressurizing plate and the second pressurizing plate can move toward each other along the first direction to apply pressure to a battery cell arranged between the first pressurizing plate and the second pressurizing plate from both sides.

[0006] When it is necessary to pressurize the battery cells, multiple battery cells can be arranged between the first pressure plate and the second pressure plate. The external driving component can drive the first pressure plate and the second pressure plate to move toward each other along the first direction to reduce the distance between the first pressure plate and the second pressure plate, so that the first pressure plate and the second pressure plate can apply pressure to the battery cells from both sides, limit the deformation of the battery cells, and improve the yield of the battery cells. By changing the displacement of the first pressure plate and the displacement of the second pressure plate, the pressure applied by the first pressure plate and the second pressure plate to the battery cells can be effectively controlled, thereby achieving controllability of pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0007] In some embodiments, the battery pressurizing device further comprises a first limiter disposed on the supporting mechanism and configured to limit the first pressurizing plate from moving in a direction away from the second pressurizing plate when the pressure applied by the first pressurizing plate to the battery cell reaches a first threshold.

[0008] When the pressure applied by the first pressure plate to the battery cell reaches the first threshold, the first limiter can limit the first pressure plate; at this time, even if the pressure applied by the external driving component to the first pressure plate is removed, the first limiter can still maintain the position of the first pressure plate, reduce the movement of the first pressure plate under the reaction force of the battery cell, and keep the battery cell in a pressurized state. By setting the first limiter, when the pressure applied by the first pressure plate to the battery cell reaches the first threshold, the connection between the external driving component and the first pressure plate can be released, so that the battery pressurization device can be circulated along the production line and the efficiency can be improved.

[0009] In some embodiments, the bearing mechanism includes a first end plate, the first end plate is located on a side of the first pressure plate away from the second pressure plate. A first stopper is disposed on the first end plate; the first stopper is configured to abut against a surface of the first pressure plate away from the second pressure plate when the pressure applied by the first pressure plate to the battery cell reaches a first threshold.

[0010] The first end plate can be used to carry the first limiting member. The first limiting member can abut against the first pressure plate in the first direction to limit the first pressure plate in the first direction. The method of abutting and limiting is simple, easy to operate, and has good stability.

[0011] In some embodiments, the first limiting member is threadedly connected to the first end plate.

[0012] By rotating the first stopper, that is, moving the first stopper in the first direction, the first stopper is pressed against the first pressure plate or the first stopper is released from pressing the first pressure plate, thereby pressurizing or depressurizing the battery cell. The embodiment of the present application adopts a threaded connection method, which can make the state switching operation of the first stopper simpler and facilitate the control of pressurization and depressurization.

[0013] In some embodiments, the first limiting member includes a threaded rod and a limiting flange connected to the threaded rod, the limiting flange is located on a side of the first end plate away from the first pressure plate, and the threaded rod passes through the first end plate and is threadedly connected to the first end plate.

[0014] The limiting flange is provided so that the first limiting member is connected to the driving component. In addition, the limiting flange can also limit the feed rate of the threaded rod to reduce the risk of the threaded rod over-extruding the first pressure plate.

[0015] In some embodiments, the first end plate is provided with a first avoidance structure, and the first avoidance structure can avoid an external driving component for driving the first pressure plate to move along the first direction.

[0016] When the driving component is required to drive the first pressure plate to move along the first direction, the driving component can pass through the first avoidance structure to apply pressure to the first pressure plate. By providing the first avoidance structure, the risk of interference between the first end plate and the driving component can be reduced.

[0017] In some embodiments, the first avoidance structure includes a through hole. The through hole is configured to allow the driving component to pass through. The through hole can avoid the driving component and guide the driving component to move.

[0018] In some embodiments, there are multiple first limiters. When the pressure applied by the first pressure plate to the battery cell reaches the first threshold, multiple first limiters can limit multiple positions of the first pressure plate to make the first pressure plate more uniformly stressed, reduce the deformation of the first pressure plate, and improve the consistency of the pressure on the battery cell.

[0019] In some embodiments, the battery pressurizing device further comprises a second limiter disposed on the bearing mechanism and configured to limit the second pressurizing plate from moving in a direction away from the first pressurizing plate when the pressure applied by the second pressurizing plate to the battery cell reaches a second threshold.

[0020] When the pressure applied by the second pressure plate to the battery cell reaches the second threshold, the second limiter can limit the second pressure plate; at this time, even if the pressure applied by the external driving component to the second pressure plate is removed, the second limiter can still maintain the position of the second pressure plate, reduce the movement of the second pressure plate under the reaction force of the battery cell, and keep the battery cell in a pressurized state. By setting the second limiter, when the pressure applied by the second pressure plate to the battery cell reaches the second threshold, the connection between the external driving component and the second pressure plate can be released, so that the battery pressurization device can be circulated along the production line and the efficiency can be improved.

[0021] In some embodiments, the battery pressurizing device further comprises a plurality of partitions arranged along the first direction; the plurality of partitions are disposed between the first pressurizing plate and the second pressurizing plate, and each partition is movably disposed on the supporting mechanism along the first direction.

[0022] The partition can separate the battery cells to prevent the battery cells from directly contacting and squeezing each other, thereby reducing the risk of the battery cells being crushed. The partition can also separate the space between the first pressurizing plate and the second pressurizing plate to position the battery cells, making it easier to place the battery cells in the battery pressurizing device. In addition, when the battery pressurizing device does not apply pressure to the battery cells, the partition can also limit the battery cells to reduce the shaking amplitude of the battery cells.

[0023] In some embodiments, the bearing mechanism includes a bearing plate, a first end plate, and a second end plate. The bearing plate is used to bear the battery cell. The first end plate and the second end plate are connected to both ends of the bearing plate along the first direction, the first end plate is located on the side of the first pressure plate away from the second pressure plate, and the second end plate is located on the side of the second pressure plate away from the first pressure plate. The guide assembly is provided on the side of the bearing plate facing the battery cell and connects the first end plate and the second end plate, and the first pressure plate and the second pressure plate are movably connected to the guide assembly along the first direction.

[0024] By providing a guide assembly, the first pressure plate and the second pressure plate can be guided to move along the first direction, so as to reduce the risk of the first pressure plate and the second pressure plate being deflected during the process of moving toward each other, and improve the uniformity of the force applied to the battery cell.

[0025] In some embodiments, the first end plate is provided with a first avoidance structure, which can avoid an external driving component used to drive the first pressurizing plate to move along the first direction. The second end plate is provided with a second avoidance structure, which can avoid an external driving component used to drive the second pressurizing plate to move along the first direction.

[0026] In some embodiments, the first avoidance structure includes a through hole; and / or, the second avoidance structure includes a through hole.

[0027] In a second aspect, the present application provides a battery production system, which includes the battery pressurizing device provided in any embodiment of the first aspect and a driving component, wherein the driving component is used to drive a first pressurizing plate and a second pressurizing plate to move toward each other along a first direction.

[0028] In some embodiments, the driving component includes a first driving member and a second driving member, the first driving member is used to drive the first pressure plate and the second pressure plate to move toward each other along a first direction, and the second driving member is used to drive the first limiting member to make the first limiting member press against the first pressure plate or release the pressure of the first limiting member on the first pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0030] Figure 1 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application;

[0031] Figure 2 A schematic diagram of a battery pressurizing device provided in some embodiments of the present application viewed from a first direction;

[0032] Figure 3 for Figure 2 A schematic cross-sectional view of the battery pressurizing device shown along line AA;

[0033] Figure 4 for Figure 2 A schematic diagram of the battery pressurizing device shown as viewed from a third direction;

[0034] Figure 5 A schematic cross-sectional view of a guide assembly of a carrier mechanism of a battery pressurizing device provided in some embodiments of the present application;

[0035] Figure 6 A schematic cross-sectional view of a first end plate and a first stopper of a battery pressurizing device provided in some embodiments of the present application;

[0036] Figure 7 Schematic diagram of a battery pressurizing device provided in some other embodiments of the present application when viewed in a first direction;

[0037] Figure 8 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0038] In the drawings, the drawings are not necessarily drawn to scale.

[0039] Description of reference numerals:

[0040] 1. Battery pressurizing device;

[0041] 2. Carrying mechanism; 21. First end plate; 211. First avoidance structure; 22. Second end plate; 221. Second avoidance structure; 23. Carrying plate; 24. Guide assembly; 241. Guide shaft; 242. Slider; 2421. Fastener; 25. Side plate;

[0042] 3. First pressure plate; 4. Second pressure plate;

[0043] 5. first limiting member; 51. threaded rod; 52. limiting flange;

[0044] 6. Second limiting member; 7. Partition plate;

[0045] 200, battery cell; 300, driving component; 301, first driving member; 302, second driving member;

[0046] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The term "plurality" used in the present application refers to two or more (including two).

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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. 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.

[0058] In view of this, an embodiment of the present application provides a battery pressurizing device, which can apply pressure to the battery cell between the first pressurizing plate and the second pressurizing plate from both sides by moving the first pressurizing plate and the second pressurizing plate, thereby limiting the deformation of the battery cell and improving the yield of the battery cell.

[0059] 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.

[0060] Figure 1 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application; Figure 2 A schematic diagram of a battery pressurizing device provided in some embodiments of the present application viewed from a first direction; Figure 3 for Figure 2 A schematic cross-sectional view of the battery pressurizing device shown along line AA; Figure 4 for Figure 2 The battery pressurizing device shown is a schematic diagram viewed from a third direction.

[0061] Please refer to Figures 1 to 4 The battery pressurizing device 1 of the embodiment of the present application includes a supporting mechanism 2, a first pressurizing plate 3 and a second pressurizing plate 4. The first pressurizing plate 3 and the second pressurizing plate 4 are arranged on the supporting mechanism 2 and are opposite to each other along a first direction X. The first pressurizing plate 3 and the second pressurizing plate 4 can move toward each other along the first direction X to apply pressure to the battery cell 200 arranged between the first pressurizing plate 3 and the second pressurizing plate 4 from both sides.

[0062] The supporting mechanism 2 can be used to support the first pressurizing plate 3 and the second pressurizing plate 4. As an example, when the battery cell 200 needs to be pressurized, the supporting mechanism 2 can also be used to support the battery cell 200.

[0063] The first pressing plate 3 is movably connected to the supporting mechanism 2 along the first direction X, and the second pressing plate 4 is movably connected to the supporting mechanism 2 along the first direction X.

[0064] The first pressurizing plate 3 and the second pressurizing plate 4 may be used to pressurize one or more battery cells 200 .

[0065] In some examples, multiple battery cells 200 are arranged along the first direction X to form a battery column; optionally, when the battery cells 200 need to be pressurized, a battery column can be arranged between the first pressurization plate 3 and the second pressurization plate 4, or multiple battery columns arranged side by side can be arranged.

[0066] In other examples, multiple battery cells 200 can be arranged into a battery row along the second direction Y, which is perpendicular to the first direction X; when the battery cells 200 need to be pressurized, a battery row can be arranged between the first pressurizing plate 3 and the second pressurizing plate 4.

[0067] There may be one or more first pressurizing plates 3. There may be one or more second pressurizing plates 4. For example, the number of first pressurizing plates 3 and second pressurizing plates 4 is the same, and the first pressurizing plates 3 and second pressurizing plates 4 are arranged correspondingly.

[0068] When the battery cells 200 need to be pressurized, multiple battery cells 200 can be arranged between the first pressurization plate 3 and the second pressurization plate 4. The external driving component 300 can drive the first pressurization plate 3 and the second pressurization plate 4 to move toward each other along the first direction X to reduce the distance between the first pressurization plate 3 and the second pressurization plate 4, so that the first pressurization plate 3 and the second pressurization plate 4 can apply pressure to the battery cells 200 from both sides, limit the deformation of the battery cells 200, and improve the yield of the battery cells 200. By changing the displacement of the first pressurization plate 3 and the displacement of the second pressurization plate 4, the pressure applied by the first pressurization plate 3 and the second pressurization plate 4 to the battery cells 200 can be effectively controlled, thereby achieving controllability of pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0069] The embodiment of the present application applies pressure to the battery cell 200 by moving the first pressure plate 3 and the second pressure plate 4 toward each other, rather than applying pressure to the battery cell 200 by only moving the first pressure plate 3 .

[0070] For example, if a column of battery cells 200 is pressurized only by moving the first pressurizing plate 3, the pressure will be gradually transmitted from the first pressurizing plate 3 to multiple battery cells 200, which will cause the battery cells 200 to be pressurized unevenly, and the battery cells 200 closest to the first pressurizing plate 3 will be pressurized more. In addition, when the battery cells 200 are pressurized, the battery cells 200 will have a small compression deformation in the first direction X. The accumulation of compression of multiple battery cells 200 will cause the battery cells 200 to be offset in the first direction X, especially the battery cells 200 closest to the first pressurizing plate 3; the more battery cells 200 there are, the greater the offset of the battery cells 200 closest to the first pressurizing plate 3. If the offset of the battery cell 200 is too large, it will affect the connection between the battery cell 200 and the external device (for example, during formation, the electrode terminal of the battery cell 200 may be misaligned with the probe of the formation device due to the offset, causing safety hazards), affecting the quality rate of the battery cell 200.

[0071] In the embodiment of the present application, the first pressure plate 3 and the second pressure plate 4 apply pressure to the battery cell 200 from both sides at the same time, which can reduce the maximum displacement of the battery cell 200 when under pressure, reduce the risk of misalignment between the battery cell 200 and other components, and improve product quality.

[0072] The pressurization method of the embodiment of the present application is simple, easy to operate and low in cost; in addition, the pressurization involves fewer equipment, which can reduce the floor space and save plant layout space.

[0073] For example, under the premise that the number of battery cells 200 remains unchanged, compared with the solution of using the first pressure plate 3 for single-side pressure application, the embodiment of the present application can reduce the maximum displacement of the battery cells 200 when under pressure by 50%.

[0074] 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 200 during the formation process.

[0075] 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 200 during the injection process, thereby reducing deformation of the outer shell of the battery cell 200 .

[0076] In some embodiments, after the pressurization-related process is completed, the external driving component 300 no longer applies pressure to the first pressurization plate 3 and the second pressurization plate 4; 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 200. The battery pressurization device 1 can be circulated along the production line, thereby improving production capacity and logistics line planning.

[0077] In some embodiments, the battery pressurizing device 1 can also be applied to other scenarios where the battery cell 200 needs to be pressurized, for example, it can be applied to scenarios where the battery cell 200 is subjected to long-term charge and discharge cycles. In these scenarios, the first pressurizing plate 3 and the second pressurizing plate 4 pressurize the battery cell 200, so that the positive and negative electrodes of the battery cell 200 are closely attached to the separator, thereby improving the uniformity of the interface reaction and increasing the service life of the battery.

[0078] In some embodiments, when the battery cell 200 needs to be pressurized, the first pressurizing plate 3 and the second pressurizing plate 4 move toward the middle position at substantially the same speed based on the middle position of the battery pressurizing device 1 along the first direction X.

[0079] In some embodiments, the driving component 300 is independently provided with the battery pressurizing device 1 to facilitate the circulation of the battery pressurizing device 1 in the production line.

[0080] In some embodiments, the battery pressurizing device 1 further includes a first limiter 5, which is disposed on the supporting mechanism 2. The first limiter 5 is configured to limit the first pressurizing plate 3 from moving in a direction away from the second pressurizing plate 4 when the pressure applied by the first pressurizing plate 3 to the battery cell 200 reaches a first threshold.

[0081] The first threshold value may be set according to the pressure requirement of the battery cell 200 .

[0082] There may be one or more first stopper 5. As an example, there may be more than one first stopper 5.

[0083] The position of the first stopper 5 can be set as needed. For example, the first stopper 5 can be set on the side of the first pressure plate 3 away from the second pressure plate 4 along the first direction X, or on the side of the first pressure plate 3 along the second direction Y, or on the side of the first pressure plate 3 along the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. Optionally, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0084] The first limiting member 5 can be driven manually or by an external driving component 300 .

[0085] When the pressure applied by the first pressure plate 3 to the battery cell 200 reaches a first threshold, the first limiter 5 can limit the first pressure plate 3; at this time, even if the pressure applied by the external driving component 300 to the first pressure plate 3 is removed, the first limiter 5 can still maintain the position of the first pressure plate 3, reduce the movement of the first pressure plate 3 under the reaction force of the battery cell 200, and keep the battery cell 200 in a pressurized state.

[0086] By setting the first limit member 5, the embodiment of the present application can release the connection between the external driving component 300 and the first pressure plate 3 when the pressure applied by the first pressure plate 3 to the battery cell 200 reaches a first threshold, thereby facilitating the circulation of the battery pressurizing device 1 along the production line and improving efficiency.

[0087] In some embodiments, the supporting mechanism 2 includes a first end plate 21, and the first end plate 21 is located on a side of the first pressure plate 3 away from the second pressure plate 4. The first stopper 5 is disposed on the first end plate 21. The first stopper 5 is configured to abut against a surface of the first pressure plate 3 away from the second pressure plate 4 when the pressure applied by the first pressure plate 3 to the battery cell 200 reaches a first threshold.

[0088] The first end plate 21 can be used to carry the first limiting member 5. The first limiting member 5 can abut against the first pressure plate 3 in the first direction X to limit the first pressure plate 3 in the first direction X. The abutting and limiting method is simple, easy to operate, and has good stability.

[0089] In some embodiments, the first limiting member 5 is threadedly connected to the first end plate 21 .

[0090] Exemplarily, the first end plate 21 is provided with a threaded hole, and the first limiting member 5 includes a bolt, a screw, a threaded rod or other threaded member.

[0091] By rotating the first stopper 5, i.e., moving the first stopper 5 in the first direction X, the first stopper 5 is pressed against the first pressure plate 3 or the first stopper 5 is released from pressing the first pressure plate 3, thereby pressurizing or depressurizing the battery cell 200. The embodiment of the present application adopts a threaded connection method, which can make the state switching operation of the first stopper 5 simpler and facilitate the control of pressurization and depressurization.

[0092] In some embodiments, the first end plate 21 is provided with a first avoidance structure 211 , and the first avoidance structure 211 can avoid the external driving component 300 for driving the first pressurizing plate 3 to move along the first direction X.

[0093] Exemplarily, the first avoidance structure 211 may include at least one of a hole, a groove, and a notch.

[0094] The number of the first avoidance structure 211 may be one or more.

[0095] When the driving component 300 is required to drive the first pressure plate 3 to move along the first direction X, the driving component 300 can pass through the first avoidance structure 211 to apply pressure to the first pressure plate 3. The embodiment of the present application can reduce the risk of interference between the first end plate 21 and the driving component 300 by providing the first avoidance structure 211.

[0096] In some embodiments, a plurality of first avoidance structures 211 are provided. By providing a plurality of first avoidance structures 211, the driving component 300 can apply force to multiple positions of the first pressurizing plate 3, thereby improving the uniformity of the force applied to the first pressurizing plate 3 and reducing the deformation of the first pressurizing plate 3.

[0097] In some embodiments, the first avoidance structure 211 includes a through hole, and the through hole is configured to allow the driving component 300 to pass through. The through hole can avoid the driving component 300 and guide the driving component 300 to move.

[0098] In some embodiments, the driving component 300 includes a push rod, which can pass through the through hole and press against the first pressure plate 3 to apply pressure to the first pressure plate 3 .

[0099] In some embodiments, there are multiple first limiting members 5 .

[0100] The shapes of the plurality of first limiting members 5 may be the same or different.

[0101] The arrangement positions of the plurality of first position-limiting members 5 can be set according to design requirements. For example, the plurality of first position-limiting members 5 can be arranged at intervals along a straight line; for another example, the plurality of first position-limiting members 5 can be arranged in a rectangular array or an annular array.

[0102] When the pressure applied by the first pressure plate 3 to the battery cell 200 reaches a first threshold, multiple first limiting members 5 can limit multiple positions of the first pressure plate 3 to make the force on the first pressure plate 3 more uniform, reduce the deformation of the first pressure plate 3, and improve the consistency of the pressure on the battery cell 200.

[0103] In some embodiments, the number of first stoppers 5 may be positively correlated with the area of ​​the first pressurizing plate 3. For example, the larger the area of ​​the first pressurizing plate 3 is, the more first stoppers 5 need to be provided to improve the uniformity of the force applied to the first pressurizing plate 3.

[0104] The position of the first limiter 5 can be determined according to parameters such as the shape and size of the first pressure plate 3 .

[0105] In some embodiments, a plurality of first limiting members 5 are arranged in an array along the second direction Y and the third direction Z.

[0106] In some embodiments, the battery pressurizing device 1 further includes a second limiter 6, which is disposed on the supporting mechanism 2. The second limiter 6 is configured to limit the second pressurizing plate 4 from moving in a direction away from the first pressurizing plate 3 when the pressure applied by the second pressurizing plate 4 to the battery cell 200 reaches a second threshold.

[0107] The second threshold value may be the same as or different from the first threshold value. Optionally, the first threshold value is equal to the second threshold value.

[0108] There may be one or more second position-limiting members 6. As an example, there may be more than one second position-limiting member 6.

[0109] The position of the second limiter 6 can be set as needed. For example, the second limiter 6 can be arranged on a side of the second pressure plate 4 along the first direction X away from the first pressure plate 3 .

[0110] The second limiting member 6 can be driven manually or by an external driving component 300 .

[0111] When the pressure applied by the second pressure plate 4 to the battery cell 200 reaches a second threshold, the second limiter 6 can limit the second pressure plate 4; at this time, even if the pressure applied by the external driving component 300 to the second pressure plate 4 is removed, the second limiter 6 can still maintain the position of the second pressure plate 4, reducing the movement of the second pressure plate 4 under the reaction force of the battery cell 200, so that the battery cell 200 is continuously in a pressurized state.

[0112] By setting the second limit member 6, the embodiment of the present application can release the connection between the external driving component 300 and the second pressure plate 4 when the pressure applied by the second pressure plate 4 to the battery cell 200 reaches the second threshold, so as to facilitate the circulation of the battery pressurizing device 1 along the production line and improve efficiency.

[0113] In some embodiments, the supporting mechanism 2 includes a second end plate 22, and the second end plate 22 is located on the side of the second pressure plate 4 away from the first pressure plate 3. The second stopper 6 is disposed on the second end plate 22. When the pressure applied by the second pressure plate 4 to the battery cell 200 reaches a second threshold, the second stopper 6 is used to abut against the surface of the second pressure plate 4 away from the first pressure plate 3.

[0114] The second end plate 22 can be used to carry the second limiting member 6. The second limiting member 6 can abut against the second pressure plate 4 in the first direction X to limit the second pressure plate 4 in the first direction X. The abutting and limiting method is simple, easy to operate, and has good stability.

[0115] In some embodiments, the second limiting member 6 is threadedly connected to the second end plate 22 .

[0116] Exemplarily, the second end plate 22 is provided with a threaded hole, and the second limiting member 6 includes a bolt, a screw, a threaded rod or other threaded member.

[0117] By rotating the second stopper 6, i.e., moving the second stopper 6 in the first direction X, the second stopper 6 is pressed against the second pressure plate 4 or the second stopper 6 is released from pressing the second pressure plate 4, thereby pressurizing or depressurizing the battery cell 200. The embodiment of the present application adopts a threaded connection method, which can make the state switching operation of the second stopper 6 simpler and facilitate the control of pressurization and depressurization.

[0118] In some embodiments, the second end plate 22 is provided with a second avoidance structure 221 , and the second avoidance structure 221 can avoid the external driving component 300 for driving the second pressurizing plate 4 to move along the first direction X.

[0119] Exemplarily, the second avoidance structure 221 may include at least one of a hole, a groove, and a notch.

[0120] The number of the second avoidance structure 221 may be one or more.

[0121] When the driving component 300 is required to drive the second pressure plate 4 to move along the first direction X, the driving component 300 can pass through the second avoidance structure 221 to apply pressure to the second pressure plate 4. The embodiment of the present application can reduce the risk of interference between the second end plate 22 and the driving component 300 by providing the second avoidance structure 221.

[0122] In some embodiments, a plurality of second avoidance structures 221 are provided. By providing a plurality of second avoidance structures 221, the driving component 300 can apply force to multiple positions of the second pressurizing plate 4, thereby improving the uniformity of the force applied to the second pressurizing plate 4 and reducing the deformation of the second pressurizing plate 4.

[0123] In some embodiments, the second avoidance structure 221 includes a through hole, and the through hole is used for the driving component 300 to pass through. The through hole can avoid the driving component 300 and guide the driving component 300 to move.

[0124] In some embodiments, the driving component 300 includes a push rod, which can pass through the through hole and press against the second pressure plate 4 to apply pressure to the second pressure plate 4 .

[0125] In some embodiments, there are multiple second limiting members 6 .

[0126] When the pressure applied by the second pressure plate 4 to the battery cell 200 reaches a second threshold, multiple second limiting members 6 can limit multiple positions of the second pressure plate 4 to make the force on the second pressure plate 4 more uniform, reduce the deformation of the second pressure plate 4, and improve the consistency of the pressure on the battery cell 200.

[0127] In some embodiments, the battery pressurizing device 1 further comprises a plurality of partitions 7 arranged along the first direction X; the plurality of partitions 7 are disposed between the first pressurizing plate 3 and the second pressurizing plate 4. Each partition 7 is movably disposed on the supporting mechanism 2 along the first direction X.

[0128] One battery cell 200 or a plurality of battery cells 200 may be arranged between adjacent separators 7 .

[0129] The partition 7 can separate the battery cells 200 to prevent the battery cells 200 from directly contacting and squeezing each other, thereby reducing the risk of the battery cells 200 being crushed. The partition 7 can also separate the space between the first pressurizing plate 3 and the second pressurizing plate 4 to position the battery cells 200, thereby facilitating the placement of the battery cells 200 in the battery pressurizing device 1. In addition, when the battery pressurizing device 1 does not apply pressure to the battery cells 200, the partition 7 can also limit the battery cells 200 to reduce the shaking amplitude of the battery cells 200.

[0130] In some embodiments, an elastic layer is provided on the surface of the separator 7. The elastic layer is used to contact and press against the battery cell 200. By providing the elastic layer, a buffering effect can be played, reducing the risk of damage to the battery cell 200 due to external impact.

[0131] In some embodiments, the separator 7 separates the battery cells adjacent to each other in the first direction X.

[0132] In some embodiments, the elastic layer is made of silicone.

[0133] In some embodiments, the bearing mechanism 2 includes a bearing plate 23, a first end plate 21, a second end plate 22, and a guide assembly 24. The bearing plate 23 is used to bear the battery cell 200. The first end plate 21 and the second end plate 22 are connected to both ends of the bearing plate 23 along the first direction X, the first end plate 21 is located on the side of the first pressure plate 3 away from the second pressure plate 4, and the second end plate 22 is located on the side of the second pressure plate 4 away from the first pressure plate 3. The guide assembly 24 is provided on the side of the bearing plate 23 facing the battery cell 200 and connects the first end plate 21 and the second end plate 22, and the first pressure plate 3 and the second pressure plate 4 are movably connected to the guide assembly 24 along the first direction X.

[0134] The number of guide components 24 may be one or more.

[0135] By setting the guide assembly 24, the first pressure plate 3 and the second pressure plate 4 can be guided to move along the first direction X to reduce the risk of the first pressure plate 3 and the second pressure plate 4 being deflected during the process of moving toward each other, thereby improving the uniformity of the force applied to the battery cell 200.

[0136] In some embodiments, the supporting plate 23 may be a flat plate structure.

[0137] In some embodiments, at least two guide assemblies 24 are provided. The two guide assemblies 24 may be spaced apart along the second direction Y, and the first pressure plate 3 is connected to the two guide assemblies 24 at both ends along the second direction Y, and the second pressure plate 4 is connected to the two guide assemblies 24 at both ends along the second direction Y.

[0138] In some embodiments, in the third direction Z, the first pressure plate 3 and the supporting plate 23 are spaced apart from each other to reduce the resistance to the movement of the first pressure plate 3 during the movement of the first pressure plate 3 .

[0139] In some embodiments, in the third direction Z, the second pressurizing plate 4 and the carrying plate 23 are spaced apart from each other.

[0140] In some embodiments, each partition 7 is movably connected to the guide assembly 24 along the first direction X.

[0141] In some embodiments, the first end plate 21 is provided with a first avoidance structure 211, and the first avoidance structure 211 can avoid the external driving component 300 used to drive the first pressurizing plate 3 to move along the first direction X. The second end plate 22 is provided with a second avoidance structure 221, and the second avoidance structure 221 can avoid the external driving component 300 used to drive the second pressurizing plate 4 to move along the first direction X.

[0142] In some embodiments, the first avoidance structure 211 includes a through hole. In other embodiments, the second avoidance structure 221 includes a through hole. In some embodiments, the first avoidance structure 211 includes a through hole, and the second avoidance structure 221 includes a through hole.

[0143] In some embodiments, the supporting mechanism 2 further includes a side plate 25 , and the side plate 25 connects the first end plate 21 and the second end plate 22 .

[0144] In some embodiments, there may be a plurality of side panels 25 .

[0145] In some embodiments, there may be four side plates 25 . Two side plates 25 are located on the same side of the plurality of partitions 7 along the second direction Y and are spaced apart along the third direction Z. A guide assembly 24 is disposed between the two side plates 25 .

[0146] The remaining two side plates 25 are located on the other side of the plurality of partition plates 7 along the second direction Y and are spaced apart along the third direction Z. Another guide assembly 24 is disposed between the two side plates 25 .

[0147] Figure 5 A schematic cross-sectional view of a guide assembly of a carrier mechanism of a battery pressurizing device provided in some embodiments of the present application.

[0148] like Figure 4 and Figure 5 As shown, in some embodiments, the guide assembly 24 includes a guide shaft 241 and a slider 242, the guide shaft 241 extends along the first direction X and connects the first end plate 21 and the second end plate 22, a plurality of sliders 242 are arranged on the guide shaft 241 along the first direction X, and each slider 242 is slidably connected to the guide shaft 241 along the first direction X.

[0149] The first pressure plate 3 is connected to the guide shaft 241 through at least one slider 242. The second pressure plate 4 is connected to the guide shaft 241 through at least one slider 242. Each partition plate 7 is connected to the guide shaft 241 through at least one slider 242.

[0150] In some embodiments, the slider 242 may include two buckling members 2421 buckled on the guide shaft 241. The two buckling members 2421 are detachably connected.

[0151] Figure 6 A schematic cross-sectional view of a first end plate and a first limiting member of a battery pressurizing device provided in some embodiments of the present application.

[0152] like Figure 6As shown, in some embodiments, the first limiting member 5 includes a threaded rod 51 and a limiting flange 52 connected to the threaded rod 51, the limiting flange 52 is located on the side of the first end plate 21 away from the first pressure plate 3, and the threaded rod 51 passes through the first end plate 21 and is threadedly connected to the first end plate 21.

[0153] The limiting flange 52 protrudes from the outer circumference of the threaded rod 51 .

[0154] The limiting flange 52 is provided to facilitate the connection between the first limiting member 5 and the driving component 300. In addition, the limiting flange 52 can also limit the feeding amount of the threaded rod 51 to reduce the risk of the threaded rod 51 over-pressing the first pressure plate 3.

[0155] In some embodiments, the structure of the second stopper may be substantially the same as that of the first stopper 5. Exemplarily, the second stopper also includes a threaded rod and a stopper flange connected to the threaded rod, the stopper flange of the second stopper is located on the side of the second end plate away from the second pressure plate, and the threaded rod of the second stopper passes through the second end plate and is threadedly connected to the second end plate.

[0156] Figure 7 Schematic diagram of a battery pressurizing device provided in some other embodiments of the present application when observed in a first direction.

[0157] like Figure 7 As shown, in some embodiments, the first avoidance structure 211 may include an avoidance groove. Exemplarily, the avoidance groove is recessed from one end of the first end plate 21 along the third direction Z.

[0158] Figure 8 A schematic diagram of the structure of a battery production system provided for some embodiments of the present application.

[0159] like Figure 3 and Figure 8 As shown, an embodiment of the present application provides a battery production system, which includes a battery pressurizing device 1 provided in any of the aforementioned embodiments and a driving component 300, and the driving component 300 is used to drive the first pressurizing plate 3 and the second pressurizing plate 4 to move toward each other along the first direction X.

[0160] The driving component 300 may be one or more. In some examples, the driving component 300 is integrated, and can be connected to the first pressurizing plate 3 and the second pressurizing plate 4 at the same time. In other examples, there are two driving components 300, and the two driving components 300 are used to drive the first pressurizing plate 3 and the second pressurizing plate 4 respectively.

[0161] When the battery cells 200 need to be pressurized, multiple battery cells 200 can be arranged between the first pressurizing plate 3 and the second pressurizing plate 4. The driving component 300 can drive the first pressurizing plate 3 and the second pressurizing plate 4 to move toward each other along the first direction X to reduce the spacing between the first pressurizing plate 3 and the second pressurizing plate 4, so that the first pressurizing plate 3 and the second pressurizing plate 4 can apply pressure to the battery cells 200 from both sides, limit the deformation of the battery cells 200, and improve the yield of the battery cells 200. By changing the displacement of the first pressurizing plate 3 and the displacement of the second pressurizing plate 4, the pressure applied by the first pressurizing plate 3 and the second pressurizing plate 4 to the battery cells 200 can be effectively controlled, thereby achieving controllability of pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0162] In some embodiments, the driving component 300 includes a motor, a cylinder, a hydraulic cylinder or other power components.

[0163] In some embodiments, there are two driving components 300 , and the two driving components 300 are used to drive the first pressure plate 3 and the second pressure plate 4 respectively.

[0164] The following is an explanation of the driving component 300 that drives the first pressure plate 3.

[0165] Exemplarily, the driving component 300 includes a first driving member 301 and a second driving member 302, the first driving member 301 is used to drive the first pressure plate 3 and the second pressure plate 4 to move toward each other along the first direction X, and the second driving member 302 is used to drive the first limiting member 5 so that the first limiting member 5 is pressed against the first pressure plate 3 or releases the pressure of the first limiting member 5 on the first pressure plate 3.

[0166] Optionally, the first driving member 301 is used to push the first pressure plate 3 along the first direction X.

[0167] Optionally, the first driving member 301 includes a cylinder and a push rod, and the cylinder drives the push rod to extend and retract, so that the push rod can pass through the first avoidance structure.

[0168] Optionally, the first driving member 301 includes a motor and a rotating member, the rotating member is used to cooperate with the first limiting member 5, the motor drives the rotating member to rotate, so as to drive the first limiting member 5 to rotate through the rotating member, and then converts the rotation of the first limiting member 5 into the movement of the first limiting member 5 along the first direction X.

[0169] In some embodiments, the driving component 300 driving the first pressure plate 3 is the same as the driving component 300 driving the second pressure plate 4 .

[0170] In some embodiments, the battery production system further includes a processing device (not shown) for performing specific processing on the battery cells.

[0171] For example, in some examples, the processing device may be a negative pressure device, which is used to extract the gas inside the battery cell during the battery cell formation process.

[0172] In other examples, the processing device may be a liquid injection device, which can be used to inject electrolyte into the interior of the battery cell.

[0173] Reference Figures 1 to 4 An embodiment of the present application provides a battery pressurizing device 1, which includes a supporting mechanism 2, a first pressurizing plate 3, a second pressurizing plate 4, a first limiter 5, a second limiter 6 and a plurality of partitions 7.

[0174] The supporting mechanism 2 includes a supporting plate 23, a first end plate 21, a second end plate 22, and a guide assembly 24. The supporting plate 23 is used to support the battery cell 200. The first end plate 21 and the second end plate 22 are connected to both ends of the supporting plate 23 along the first direction X. The guide assembly 24 is disposed on a side of the supporting plate 23 facing the battery cell 200 and connects the first end plate 21 and the second end plate 22.

[0175] In the first direction X, the first pressure plate 3 and the second pressure plate 4 are located between the first end plate 21 and the second end plate 22, the first end plate 21 is located on the side of the first pressure plate 3 away from the second pressure plate 4, and the second end plate 22 is located on the side of the second pressure plate 4 away from the first pressure plate 3.

[0176] A plurality of partitions 7 are arranged between the first pressurizing plate 3 and the second pressurizing plate 4 along the first direction X. The first pressurizing plate 3 and the second pressurizing plate 4 are movably connected to the guide assembly 24 along the first direction X, and each partition 7 is movably connected to the guide assembly 24 along the first direction X.

[0177] The first pressurizing plate 3 and the second pressurizing plate 4 are movable toward each other along the first direction X to apply pressure to the battery cells 200 disposed between the first pressurizing plate 3 and the second pressurizing plate 4 from both sides.

[0178] The first stopper 5 is threadedly connected to the first end plate 21. When the pressure applied by the first pressure plate 3 to the battery cell 200 reaches a first threshold, the first stopper 5 is used to abut against the surface of the first pressure plate 3 away from the second pressure plate 4.

[0179] The second stopper 6 is threadedly connected to the second end plate 22. When the pressure applied by the second pressure plate 4 to the battery cell 200 reaches a second threshold, the second stopper 6 is used to abut against the surface of the second pressure plate 4 away from the first pressure plate 3.

[0180] The first end plate 21 and the second end plate 22 are both provided with through holes. The external driving component 300 can pass through the through hole of the first end plate 21 and push the first pressurizing plate 3, and can pass through the through hole of the second end plate 22 and push the second pressurizing plate 4.

[0181] 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 The first pressure plate and the second pressure plate are arranged on the supporting mechanism and are opposite to each other along a first direction. The first pressure plate and the second pressure plate can move toward each other along the first direction to apply pressure to the battery cells arranged between the first pressure plate and the second pressure plate from both sides.

2. The battery pressurizing device according to claim 1, characterized in that: The battery pressurizing device further includes a first limiting member, which is arranged on the bearing mechanism; The first limiting member is configured to limit the first pressing plate from moving in a direction away from the second pressing plate when the pressure applied by the first pressing plate to the battery cell reaches a first threshold.

3. The battery pressurizing device according to claim 2, characterized in that: The bearing mechanism comprises a first end plate, and the first end plate is located on a side of the first pressure plate facing away from the second pressure plate; The first stopper is disposed on the first end plate; the first stopper is configured to abut against a surface of the first pressure plate facing away from the second pressure plate when the pressure applied by the first pressure plate to the battery cell reaches a first threshold.

4. The battery pressurizing device according to claim 3, characterized in that: The first limiting member is threadedly connected to the first end plate.

5. The battery pressurizing device according to claim 3 or 4, characterized in that: The first limiting member includes a threaded rod and a limiting flange connected to the threaded rod, the limiting flange is located on a side of the first end plate away from the first pressure plate, and the threaded rod passes through the first end plate and is threadedly connected to the first end plate.

6. The battery pressurizing device according to any one of claims 3 to 5, characterized in that: The first end plate is provided with a first avoidance structure, and the first avoidance structure can avoid an external driving component for driving the first pressure plate to move along the first direction.

7. The battery pressurizing device according to claim 6, characterized in that: The first avoidance structure includes a through hole configured to allow the driving component to pass through.

8. The battery pressurizing device according to any one of claims 2 to 7, characterized in that: There are multiple first limiting members.

9. The battery pressurizing device according to any one of claims 2 to 8, characterized in that: The battery pressurizing device further includes a second limiting member, which is arranged on the bearing mechanism; The second limiting member is configured to limit the second pressurizing plate from moving in a direction away from the first pressurizing plate when the pressure applied by the second pressurizing plate to the battery cell reaches a second threshold.

10. The battery pressurizing device according to any one of claims 1 to 9, characterized in that: The battery pressurizing device further includes a plurality of partitions arranged along the first direction; the plurality of partitions are disposed between the first pressurizing plate and the second pressurizing plate; Each of the partitions is movably disposed on the supporting mechanism along the first direction.

11. The battery pressurizing device according to any one of claims 1 to 10, characterized in that: The carrying mechanism comprises: A carrying plate, used for carrying the battery cells; A first end plate and a second end plate, connected to two ends of the bearing plate along the first direction, the first end plate being located on a side of the first pressurizing plate away from the second pressurizing plate, and the second end plate being located on a side of the second pressurizing plate away from the first pressurizing plate; A guide assembly is provided on a side of the carrier plate facing the battery cell and connects the first end plate and the second end plate. The first pressure plate and the second pressure plate are movably connected to the guide assembly along the first direction.

12. The battery pressurizing device according to claim 11, characterized in that: The first end plate is provided with a first avoidance structure, and the first avoidance structure can avoid an external driving component used to drive the first pressure plate to move along the first direction; The second end plate is provided with a second avoidance structure, and the second avoidance structure can avoid an external driving component for driving the second pressurizing plate to move along the first direction.

13. The battery pressurizing device according to claim 12, characterized in that: The first avoidance structure comprises a through hole; and / or The second avoidance structure includes a through hole.

14. A battery production system, characterized in that: include: The battery pressurizing device according to any one of claims 1 to 13; as well as The driving component is used to drive the first pressing plate and the second pressing plate to move toward each other along the first direction.

15. A battery production system, characterized in that: include: The battery pressurizing device according to any one of claims 2 to 9; as well as The driving component includes a first driving member and a second driving member, the first driving member is used to drive the first pressure plate and the second pressure plate to move toward each other along the first direction, and the second driving member is used to drive the first limiting member to make the first limiting member press against the first pressure plate or release the pressure of the first limiting member on the first pressure plate.

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