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 plurality of pressurizing mechanisms are arranged on the bearing mechanism and are arranged in the first direction, the battery monomers are placed between the adjacent pressurizing mechanisms, and the pressurizing mechanisms are configured to extrude the battery monomers through expansion.

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 pressurize battery cells and improve the uniformity of the pressure on the battery cells.

[0005] In a first aspect, the present application provides a battery pressurizing device, comprising a carrying mechanism and a plurality of pressurizing mechanisms. The plurality of pressurizing mechanisms are disposed on the carrying mechanism and arranged along a first direction, battery cells are placed between adjacent pressurizing mechanisms, and the pressurizing mechanisms are configured to compress the battery cells by expansion.

[0006] When it is necessary to pressurize the battery cells, multiple battery cells can be inserted between multiple pressurizing mechanisms. By applying external force to the pressurizing mechanism, the pressurizing mechanism expands and squeezes the battery cells. The embodiment of the present application can provide multiple pressurizing sites by setting up multiple pressurizing mechanisms, thereby improving the uniformity of pressurization of 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 pressurized, and reduce the risk of misalignment of the battery cells and other components. The pressure applied by the pressurizing mechanism to the battery cell is related to the amount of expansion. By controlling the amount of expansion of the pressurizing mechanism, the pressure applied by the pressurizing mechanism to the battery cell can be effectively controlled, thereby achieving controllability of the pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0007] In some embodiments, the pressurizing mechanism includes a bladder, a receiving cavity is provided inside the bladder, the receiving cavity is used to communicate with the fluid conveying mechanism, and the fluid conveying mechanism is used to convey fluid to the receiving cavity. The bladder is used to compress the battery cell.

[0008] The fluid delivery mechanism can fill the accommodating cavity with fluid to utilize the pressure of the fluid to expand and deform the capsule, thereby causing the capsule to exert pressure on the battery cell. The deformation of the capsule can be changed by adjusting the amount of fluid filled. In other words, by adjusting the fluid input by the fluid delivery mechanism, the pressure exerted by the capsule on the battery cell can be effectively controlled, thereby improving the reliability of the pressure.

[0009] In some embodiments, the sac body further includes a sac opening connected to the accommodating cavity, and the pressurizing mechanism further includes a valve body installed at the sac opening, and the valve body is used to connect with the fluid delivery mechanism.

[0010] By opening a sac opening and installing a valve body in the sac body, the amount of fluid medium filled in the accommodating cavity can be adjusted to change the volume of the sac body. In this way, when using the battery pressurizing device, the sac opening and the valve body can be used to fill the accommodating cavity with fluid medium only when the battery cell needs to be squeezed, and the accommodating cavity is kept empty or filled with a small amount of fluid medium when loading and unloading the battery cell, so as to facilitate the removal and placement of the battery cell.

[0011] In some embodiments, the pressurizing mechanism includes a bladder and an expandable body, wherein a receiving cavity is provided inside the bladder, and the expandable body is received in the receiving cavity. The expandable body is configured to expand under a preset condition, and the bladder is used to compress the battery cell.

[0012] In the embodiment of the present application, the expansion deformation of the bladder can be achieved by the expansion of the expandable body, so that the bladder applies pressure to the battery cell. The pressure applied by the bladder to the battery cell can be effectively controlled by controlling the expansion amount of the expandable body, thereby improving the reliability of the pressure.

[0013] In some embodiments, the expandable body is configured to expand when voltage is applied or when heated. Energization and heating are easy to implement and control, which helps to simplify the structure of the battery pressurization device.

[0014] In some embodiments, the expandable body includes at least one of a piezoelectric ceramic and a phase change material.

[0015] In some embodiments, the pressurizing mechanism further comprises an electrode connector mounted on the capsule, and the electrode connector is electrically connected to the expandable body. By providing the electrode connector, it is convenient to apply voltage to the expandable body, thereby controlling the expansion and contraction of the expandable body. Using voltage as a trigger adjustment for the expansion of the expandable body can improve the accuracy and rapidity of the control and simplify the battery pressurizing device.

[0016] In some embodiments, the capsule includes a substrate and a flexible body connected to the substrate, the elastic modulus of the substrate is greater than the elastic modulus of the flexible body, and the flexible body is used to squeeze the battery cell. The substrate and the flexible body enclose to form a receiving cavity, or the receiving cavity is formed inside the flexible body.

[0017] The flexible body has good elasticity. When the internal pressure in the accommodating cavity increases, the flexible body can deform quickly to transmit the pressure to the battery cell. The substrate has great strength and is not easily deformed, which can help to achieve directional deformation of the pressurizing mechanism and increase the rate of increase of the internal pressure in the accommodating cavity. When the flexible body is worn, the flexible body can be replaced, thereby reducing the maintenance cost of the battery pressurizing device. When the battery cell is charged and discharged, the volume of the battery cell will expand and contract. The flexible body can undergo adaptive elastic deformation according to the shape of the battery cell, thereby maintaining the compression of the capsule on the surface of the battery cell and improving the uniformity of the force on the battery cell.

[0018] In some embodiments, a concave portion is provided on one side of the substrate along the first direction, and the flexible body covers the concave portion to form a receiving cavity; or, at least a portion of the flexible body is received in the concave portion, and the interior of the flexible body forms the receiving cavity.

[0019] The substrate with higher strength can serve as a skeleton to support and shape the flexible body, so that the flexible body remains open and stretched, so that it can better contact and squeeze the battery cells. In addition, the substrate with higher strength can also protect the flexible body during installation and reduce the risk of damage to the flexible body.

[0020] In some embodiments, along the first direction, only one side of the substrate is provided with a recess. At least one pressurizing mechanism comprises two capsules arranged along the first direction; the recesses of the substrates of the two capsules are arranged opposite to each other along the first direction.

[0021] The two bladders of the pressurizing mechanism can apply pressure to the two battery cells respectively; the flexible bodies of the two bladders are arranged opposite to each other, so the two bladders expand in opposite directions, which can reduce the influence of the two bladders on each other's expansion and improve the uniformity of the pressure on the battery cells.

[0022] In some embodiments, at least one pressurizing mechanism further includes a partition disposed between the two capsules. By disposing a partition between the two capsules, the thickness of the pressurizing mechanism can be further changed by using the partition to adapt to thinner battery cells. At the same time, since the partition is sandwiched between the capsules, the thickness of the pressurizing mechanism can be adjusted by extracting or replacing the partition, thereby improving the compatibility of the battery pressurizing device with battery cells of different thickness ranges.

[0023] In some embodiments, recesses are provided on both sides of the substrate along the first direction. There are two flexible bodies, and the two flexible bodies are provided correspondingly to the two recesses.

[0024] The two flexible bodies cover the two recesses respectively to form two accommodating chambers. One capsule can pressurize the battery cells on both sides at the same time, which can reduce the number of capsules in the pressurizing mechanism and simplify the structure of the pressurizing mechanism. The substrate separates the two accommodating chambers, so that the internal pressures of the two accommodating chambers can be independently controlled.

[0025] In some embodiments, the substrate is provided with a receiving hole, and the receiving hole penetrates the receiving hole along the first direction. The capsule includes two flexible bodies, and the two flexible bodies cover the receiving hole from two sides respectively to form a receiving cavity.

[0026] One capsule can apply pressure to the battery cells on both sides at the same time, which can reduce the number of capsules in the pressurizing mechanism; the two flexible bodies are located on both sides of the same accommodating cavity, that is, the expansion of one accommodating cavity will drive the deformation of the two flexible bodies, which can simplify the structure of the pressurizing mechanism.

[0027] In some embodiments, the substrate is provided with a receiving hole, and the receiving hole penetrates the receiving hole along the first direction. The capsule includes two flexible bodies; at least part of the flexible body is received in the receiving hole, and a receiving cavity is formed inside the flexible body. One flexible body can pressurize the battery cells on both sides at the same time, which can reduce the number of capsules of the pressurizing mechanism and simplify the structure of the pressurizing mechanism.

[0028] In some embodiments, the battery pressurizing device further includes a bracket, which is disposed between adjacent pressurizing mechanisms and is used to support the battery cells.

[0029] When the specifications of the battery cells change, different brackets are replaced to make the brackets compatible with the battery cells. The embodiment of the present application can shorten the time for changing models, reduce the cost of changing models, and increase the application range of the battery pressurizing device.

[0030] In some embodiments, the bracket is connected to a supporting mechanism, which can limit the movement of the bracket and improve the stability of the battery cell during the pressurization process.

[0031] In some embodiments, in the first direction, at least a portion of the bracket overlaps with the flexible body and is used to define a deformation region of the flexible body.

[0032] The bracket can limit the deformation area of ​​the flexible body so that the flexible body can squeeze the set area of ​​the battery cell, reduce the risk of the flexible body covering other areas of the battery cell, and further reduce the risk of the outer shell of the battery cell being compressed and deformed.

[0033] In some embodiments, the bracket includes a bearing portion and two limiting portions, the two limiting portions are arranged opposite to each other along a second direction and connected to the bearing portion, the second direction is perpendicular to the first direction, and the two limiting portions are located on a side of the bearing portion facing the battery cell.

[0034] The bearing portion can support the battery cell, and the limiting portion can limit the battery cell from both sides, thereby improving the stability of the battery cell during the pressurization process.

[0035] In some embodiments, the bracket further includes a connecting portion, which is disposed on a side of the limiting portion away from the battery cell along the second direction, and is used to be connected to the supporting mechanism.

[0036] By providing the connecting portion, the connection between the bracket and the supporting mechanism can be achieved, the movement of the bracket on the supporting mechanism can be restricted, and the stability of the battery cell during the pressurization process can be improved.

[0037] In some embodiments, the bearing mechanism includes a bearing plate, two end plates and a connecting rod, the two end plates are connected to the bearing plate and are spaced apart along a first direction, and the connecting rod connects the two end plates. A plurality of pressurizing mechanisms are located on one side of the bearing plate along a third direction and are arranged between the two end plates, and the third direction is perpendicular to the first direction and the second direction. The connecting portion is connected to the connecting rod.

[0038] In the embodiment of the present application, the two end plates are connected by a connecting rod, which can improve the structural strength of the bearing mechanism. Compared with the solution of connecting the two end plates by using a side plate, connecting the two end plates by using a connecting rod can achieve the effect of reducing weight. The connecting rod can limit the bracket and improve the stability of the battery cell during the pressurization process.

[0039] In some embodiments, a slot is provided on one side of the connecting portion facing the load-bearing plate along the third direction, and at least a portion of the connecting rod is accommodated in the slot. The bracket further includes a first protrusion provided on the limiting portion, and the first protrusion is located on the side of the connecting portion facing the load-bearing plate. In the third direction, a portion of the connecting rod is located between the first protrusion and the connecting portion.

[0040] The portion of the connecting rod at least partially accommodated in the slot can limit the connection portion in the second direction. The first protrusion can stop the connecting rod in the third direction, thereby reducing the risk of the connecting rod coming out of the slot and improving the stability of the bracket.

[0041] In some embodiments, the limiting portion includes an elastic arm and an avoidance groove located inside the elastic arm, and the first protrusion protrudes from a surface of the elastic arm away from the avoidance groove.

[0042] The avoidance groove can provide an avoidance space for the swing of the elastic arm, so that the elastic arm can drive the first protrusion to move inward by a certain amplitude. During assembly, the bracket can be inserted into the bearing mechanism along the third direction. When the connecting rod squeezes the first protrusion, the elastic arm can deform toward the avoidance groove so that the first protrusion avoids the connecting rod; when the connecting rod enters the slot and reaches the set position, the elastic arm returns to its original state so that the first protrusion stops the connecting rod in the third direction. By providing the elastic arm and the avoidance groove, the assembly process of the battery pressurizing device can be simplified.

[0043] In some embodiments, the bearing part is provided with a first avoidance hole, the first avoidance hole penetrates the bearing part along a third direction, the third direction is perpendicular to the first direction and the second direction. The first avoidance hole is used to avoid a lifting mechanism for lifting the battery cell.

[0044] After the battery cell is processed, it is necessary to remove the battery cell from the bracket. The embodiment of the present application provides a first avoidance hole to facilitate an external lifting mechanism to lift the battery cell from the bottom, so that the battery cell can be quickly removed from the bracket to improve efficiency. In addition, the first avoidance hole can also play a role in weight reduction and heat dissipation.

[0045] In some embodiments, the supporting mechanism includes a supporting plate, the supporting plate is located on a side of the supporting portion away from the battery cell, and the supporting plate is provided with a second avoidance hole, the second avoidance hole is used to expose the first avoidance hole.

[0046] The second avoidance hole can avoid the external lifting mechanism, reducing the risk of interference between the load-bearing plate and the external lifting mechanism, and facilitating the lifting mechanism to pass through the first avoidance hole and lift the battery cell.

[0047] In some embodiments, the limiting portion is provided with a heat dissipation hole, and the heat dissipation hole passes through the limiting portion along the second direction.

[0048] By providing heat dissipation holes on the limiting part, the heat dissipation effect of the bracket can be improved, and the risk of thermal runaway of the battery cell during the formation process can be reduced. In addition, by providing heat dissipation holes, the weight of the bracket can also be reduced.

[0049] In some embodiments, the bracket includes a plurality of sub-brackets arranged along a first direction, each sub-bracket includes a sub-bearing portion and two sub-limiting portions, the two sub-limiting portions are arranged opposite to each other along a second direction and connected to the sub-bearing portion. The bearing portion includes two sub-bearing portions, and each limiting portion includes two sub-limiting portions arranged along the first direction.

[0050] By adjusting the number of sub-brackets, battery cells of different thicknesses can be used, thereby improving the compatibility of the battery pressurizing device with different battery cells.

[0051] In some embodiments, the carrying mechanism includes a carrying plate, and the pressing mechanism and the bracket are located on one side of the carrying plate along a third direction, the third direction being perpendicular to the first direction. In the third direction, the capsule abuts against the carrying plate, and at least part of the capsule is located between the bracket and the carrying plate.

[0052] During the process of removing the battery cell from the bracket, the bracket can limit the capsule in the third direction, reduce the range of movement of the capsule under the action of the friction between the battery cell and the capsule, reduce the risk of the capsule detaching from the supporting mechanism, and improve the reliability of the battery pressurizing device.

[0053] In some embodiments, the substrate is provided with a positioning recess at one end away from the carrier plate, and the positioning recess is recessed relative to the surface of the substrate facing the bracket. The bracket includes a second convex portion, and at least a portion of the second convex portion is accommodated in the positioning recess.

[0054] The second convex portion can limit the capsule in the third direction, reduce the risk of the capsule detaching from the bearing mechanism, and improve the reliability of the battery pressurizing device. By providing the positioning concave portion, the requirement for the maximum size of the bracket along the third direction can be reduced, and the volume and weight of the bracket can be reduced.

[0055] In some embodiments, a surface of the substrate facing the bracket is provided with a plurality of positioning recesses, and the plurality of positioning recesses are arranged at intervals along the second direction; each positioning recess contains a second convex portion. The second convex portion extending into the plurality of positioning recesses can limit the capsule in the second direction, thereby improving the stability of the capsule.

[0056] In a second aspect, the present application provides a battery production system, which includes the battery pressurizing device provided by any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0058] Figure 1 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application;

[0059] Figure 2 for Figure 1 An enlarged schematic diagram at the circle frame;

[0060] 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;

[0061] Figure 4 for Figure 3 A schematic cross-sectional view of the pressurizing mechanism shown;

[0062] Figure 5 for Figure 4 An enlarged schematic diagram at the circle frame;

[0063] Figure 6 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0064] Figure 7 for Figure 6 An enlarged schematic diagram at the circle frame;

[0065] Figure 8 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0066] Fig. 9 for Figure 8 An enlarged schematic diagram at the circle frame;

[0067] Fig.10 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0068] Fig.11 for Fig.10 An enlarged schematic diagram at the circle frame;

[0069] Fig.12 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0070] Fig.13 for Fig.12 An enlarged schematic diagram at the circle frame;

[0071] Fig.14 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0072] Fig.15 for Fig.14 An enlarged schematic diagram at the circle frame;

[0073] Fig.16 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application;

[0074] Fig.17 for Fig.16 An enlarged schematic diagram at the circle frame;

[0075] Fig.18 A schematic diagram of the structure of a pressurizing mechanism and a bracket of a battery pressurizing device provided in some embodiments of the present application;

[0076] Fig.19 A schematic diagram of the structure of a bracket of a battery pressurizing device provided in some embodiments of the present application;

[0077] Fig. 20 for Fig.19 A schematic structural diagram of the sub-bracket shown;

[0078] Fig.21 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application;

[0079] Fig. 22 for Fig.21 An enlarged schematic diagram at the circle frame;

[0080] Fig.23 A schematic cross-sectional view of a battery pressurizing device provided in some embodiments of the present application;

[0081] Fig.24 for Fig.23 An enlarged schematic diagram at the circle frame;

[0082] Fig.25 for Fig.18 Enlarged diagram of the circle.

[0083] In the drawings, the drawings are not necessarily drawn to scale.

[0084] The reference numerals are as follows:

[0085] 1. bearing mechanism; 11. bearing plate; 111. second avoidance hole; 12. end plate; 13. connecting rod;

[0086] 2. Pressurizing mechanism; 21. Capsule; 211. Accommodating cavity; 212. Capsule opening; 213. Base plate; 213a. Positioning recess; 214. Flexible body; 215. Recess; 216. Accommodating hole; 22. Valve body; 23. Expandable body; 24. Electrode connector; 25. Spacer;

[0087] 3. bracket; 31. bearing part; 311. first avoidance hole; 32. limiting part; 321. elastic arm; 322. avoidance groove; 323. heat dissipation hole; 33. containing groove; 34. connecting part; 341. card slot; 35. first convex part; 36. second convex part;

[0088] 4. Sub-bracket; 41. Sub-bearing portion; 411. Avoidance recess; 42. Sub-limiting portion; 421. Heat dissipation recess;

[0089] B. Battery cells;

[0090] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] The term "plurality" used in the present application refers to two or more (including two).

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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).

[0104] In view of this, an embodiment of the present application provides a battery pressurizing device, which is provided with a pressurizing mechanism capable of expansion and deformation, 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 pressed. By adjusting the expansion amount of the pressurizing mechanism, the pressure applied by the pressurizing mechanism to the battery cell can be effectively controlled.

[0105] 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.

[0106] 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.

[0107] 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 Enlarged diagram of the circle.

[0108] like Figure 1 and Figure 2 As shown, the battery pressurizing device of the embodiment of the present application includes a carrying mechanism 1 and a plurality of pressurizing mechanisms 2. The plurality of pressurizing mechanisms 2 are disposed on the carrying mechanism 1 and arranged along a first direction X, and battery cells B are placed between adjacent pressurizing mechanisms 2, and the pressurizing mechanisms 2 are configured to compress the battery cells B by expansion.

[0109] The battery pressurizing device can be used to apply pressure to a member to be pressurized. As an example, the following description is made with the member to be pressurized being a battery cell B.

[0110] The carrying mechanism 1 can be used to carry multiple pressurizing mechanisms 2. As an example, when a battery cell B needs to be pressurized, the carrying mechanism 1 can be used to carry the battery cell B. Of course, the carrying mechanism 1 can directly carry the battery cell B or indirectly carry the battery cell B through other components (such as the bracket described later).

[0111] Exemplarily, the carrying mechanism 1 may include a pallet, which may be a flat pallet or a box pallet. The carrying mechanism 1 may be obtained by integral molding or by splicing and assembling.

[0112] The material of the supporting mechanism 1 includes but is not limited to metal, plastic, inorganic non-metal or wood.

[0113] The pressurizing mechanism 2 is a member for applying pressure to the battery cell B.

[0114] All the pressurizing mechanisms 2 of the battery pressurizing device may be arranged in a row or in multiple rows. In some examples, all the pressurizing mechanisms 2 of the battery pressurizing device are arranged in a row along the first direction X. In other examples, the battery pressurizing device includes multiple pressurizing sequences, each pressurizing sequence includes at least two pressurizing mechanisms 2 arranged along the first direction X, and multiple pressurizing sequences are arranged along the second direction Y. Optionally, the first direction X is perpendicular to the second direction Y.

[0115] The plurality of pressurizing mechanisms 2 may have the same structure or different structures, as long as the pressurizing mechanisms 2 can pressurize by expansion.

[0116] The pressure mechanism 2 is arranged on the supporting mechanism 1. As an example, the pressure mechanism 2 can be detachably mounted on the supporting mechanism 1, or can be integrally arranged on the supporting mechanism 1. The pressure mechanism 2 can be directly connected to the supporting mechanism 1, or can be restricted on the supporting mechanism 1 by other components.

[0117] Exemplarily, when the battery cells B need to be pressurized, multiple battery cells B may be inserted between multiple pressurizing mechanisms 2 , so that both sides of each battery cell B along the first direction X are provided with a pressurizing mechanism 2 .

[0118] Between two adjacent pressurizing mechanisms 2 , only one battery cell B may be inserted, or two or more battery cells B may be inserted simultaneously. As an example, in the first direction X, adjacent battery cells B are separated by the pressurizing mechanisms 2 .

[0119] The pressurizing mechanism 2 can expand under certain conditions, for example, the pressurizing mechanism 2 can expand under power-on, heating, gas filling, liquid filling or other conditions. The pressurizing mechanism 2 can squeeze the battery cell B when it expands and deforms.

[0120] Among the two pressurizing mechanisms 2 located on both sides of the battery cell B and adjacent to the battery cell B, only one pressurizing mechanism 2 may pressurize the battery cell B by expansion, or both pressurizing mechanisms 2 may pressurize the battery cell B by expansion.

[0121] When it is necessary to pressurize the battery cell B, multiple battery cells B can be inserted between multiple pressurizing mechanisms 2. By applying external force to the pressurizing mechanism 2, the pressurizing mechanism 2 is expanded and squeezes the battery cell B. The embodiment of the present application can provide multiple pressurizing sites by setting multiple pressurizing mechanisms 2, thereby improving the uniformity of the pressure on multiple battery cells B; the battery cell B is inserted between the pressurizing mechanisms 2, and the offset of the battery cell B will be limited by the pressurizing mechanisms 2 on both sides. Therefore, the embodiment of the present application can also reduce the offset of the battery cell B when it is pressed, and reduce the risk of misalignment between the battery cell B and other components. The pressure applied by the pressurizing mechanism 2 to the battery cell B is related to the amount of expansion. By controlling the amount of expansion of the pressurizing mechanism 2, the pressure applied by the pressurizing mechanism 2 to the battery cell B can be effectively controlled, thereby achieving controllability of the pressure and reducing the risk of electrolyte overflow due to excessive pressure.

[0122] In some embodiments, the expansion deformation of the pressurizing mechanism 2 is an elastically recoverable deformation.

[0123] In some embodiments, the battery pressurizing device may be used in the battery formation process to squeeze out the gas inside the battery cell B during the formation process.

[0124] In some embodiments, the battery pressurizing device may be used in the battery injection process to offset the positive pressure applied by the injection equipment to the inside of the battery cell B during the injection process, thereby reducing the deformation of the outer shell of the battery cell B.

[0125] In some embodiments, after the pressurization-related process is completed, the pressurization mechanism 2 returns to its original state. At this time, the battery pressurization device of the embodiment of the present application can also be used as a conventional tray for carrying battery cells B.

[0126] In some embodiments, the battery pressurizing device can also be used in scenarios where the battery cell B is subjected to long-term charge and discharge cycles. In these scenarios, the pressurizing mechanism 2 pressurizes the battery cell B so that the positive and negative electrodes of the battery cell B fit tightly with the separator, thereby improving the uniformity of the interface reaction and increasing the service life of the battery.

[0127] In some embodiments, the supporting mechanism 1 includes a supporting plate 11 and two end plates 12 . The two end plates 12 are connected to the supporting plate 11 and are spaced apart along the first direction X.

[0128] The plurality of pressurizing mechanisms 2 may be disposed on the same side of the carrying plate 11 along the third direction Z. Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The carrying plate 11 may be used to support the plurality of pressurizing mechanisms 2 .

[0129] The plurality of pressurizing mechanisms 2 are located between the two end plates 12 along the first direction X. The two end plates 12 can limit the plurality of pressurizing mechanisms 2 and the plurality of battery cells B in the first direction X.

[0130] In some embodiments, the bearing mechanism 1 further includes a connecting rod 13, which connects the two end plates 12 to improve the overall structural strength of the bearing mechanism 1 and reduce the risk of the end plates 12 being disconnected from the bearing plate 11 when under pressure. Alternatively, the bearing mechanism 1 may also be replaced by a side plate instead of the connecting rod 13.

[0131] In some embodiments, the battery pressurizing device includes two pressurizing sequences, and the two pressurizing sequences are arranged between the two end plates 12 .

[0132] In some embodiments, a connecting rod 13 is provided between two pressurization sequences.

[0133] 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 A schematic cross-sectional view of the pressurizing mechanism shown; Figure 5 for Figure 4 Enlarged diagram of the circle.

[0134] Please refer to Figures 2 to 5 In some embodiments, the pressurizing mechanism 2 includes a capsule 21, and a receiving cavity 211 is provided inside the capsule 21. The receiving cavity 211 is used to communicate with a fluid conveying mechanism (not shown), and the fluid conveying mechanism is used to convey fluid to the receiving cavity 211. The capsule 21 is used to compress the battery cell B.

[0135] The accommodating chamber 211 is used to accommodate a fluid. The fluid may refer to a medium that is fluid at room temperature, such as a gas medium or a liquid medium. For example, the gas medium may be a medium that is gaseous at room temperature, such as air, inert gas, nitrogen, etc., in which case the capsule 21 may be an air capsule. For example, the liquid medium may be a medium that is liquid at room temperature, such as water, oil, etc., in which case the capsule 21 may be a liquid capsule.

[0136] When the battery cell B needs to be pressurized, the pressurizing mechanism 2 can be connected to the fluid delivery mechanism. The fluid delivery mechanism can be directly connected to the bladder 21 to communicate with the accommodating chamber 211; alternatively, the fluid delivery mechanism can be indirectly connected to the bladder 21 through other components to communicate with the accommodating chamber 211 through the components.

[0137] The accommodating chambers 211 of the multiple pressurizing mechanisms 2 may be connected to the same fluid conveying mechanism or may be connected to different fluid conveying mechanisms.

[0138] The fluid delivery mechanism may only input the fluid into the accommodating chamber 211. Alternatively, the fluid delivery mechanism may both input the fluid into the accommodating chamber 211 and extract the fluid from the accommodating chamber 211.

[0139] The pressurizing mechanism 2 may include one capsule 21 or multiple capsules 21. In some examples, the pressurizing mechanism 2 includes one capsule 21, and the capsule 21 may apply pressure to the battery cells B located on both sides of the capsule 21. In other examples, the pressurizing mechanism 2 may include multiple capsules 21 arranged along the first direction X, such as two capsules 21.

[0140] The capsule 21 may be formed in one piece or assembled from multiple parts.

[0141] The fluid delivery mechanism can fill the accommodating cavity 211 with fluid to utilize the pressure of the fluid to achieve expansion and deformation of the capsule 21, thereby causing the capsule 21 to apply pressure to the battery cell B. The deformation of the capsule 21 can be changed by adjusting the amount of fluid filled. In other words, by adjusting the fluid input by the fluid delivery mechanism, the pressure applied by the capsule 21 to the battery cell B can be effectively controlled, thereby improving the reliability of the pressure.

[0142] The method of using fluid pressurization is simple, easy to operate and low-cost; in addition, fluid pressurization involves fewer equipment, which can reduce the floor space and save plant layout space.

[0143] In some embodiments, the fluid delivery mechanism includes a tube connected to a fluid source.

[0144] In some embodiments, the capsule 21 may be a flexible container. The capsule 21 may be a structure that is flexible in its entirety or partially flexible.

[0145] Exemplarily, the portion of the capsule 21 used for squeezing the battery cell B is flexible. When the battery cell B is charged and discharged, the volume of the battery cell B will expand and contract. The flexible portion of the capsule 21 can undergo adaptive elastic deformation according to the shape of the battery cell B, thereby maintaining the squeezing of the surface of the battery cell B by the capsule 21, improving the uniformity of the force on the battery cell B, and reducing the occurrence of squeezing dead corners.

[0146] In some embodiments, the capsule body 21 further includes a capsule opening 212 connected to the accommodating cavity 211 , and the pressurizing mechanism 2 further includes a valve body 22 installed at the capsule opening 212 , and the valve body 22 is used to connect with the fluid delivery mechanism.

[0147] The bladder opening 212 may be a channel for fluid to pass through, including but not limited to a through hole.

[0148] The capsule 21 may have one capsule opening 212, or may have multiple capsule openings 212. Optionally, the capsule 21 has one capsule opening 212, and one capsule opening 212 can simplify the structure of the capsule 21 and improve the reliability of the capsule 21 while achieving fluid circulation. Optionally, the capsule 21 may have multiple capsule openings 212, and multiple capsule openings 212 can quickly fill or discharge the accommodating cavity 211 with fluid, thereby increasing the rate of change of the volume of the capsule 21.

[0149] When using the battery pressurizing device, when the amount of fluid filled in the accommodating cavity 211 is small, the battery cell B is first inserted between two adjacent capsules 21, and then the fluid is filled into the accommodating cavity 211 through the valve body 22 and the capsule opening 212, so that the volume of the capsule 21 expands and becomes larger, thereby applying pressure to the battery cell B. After the battery cell B is processed, the fluid in the accommodating cavity 211 can be discharged through the valve body 22 and the capsule opening 212, and the volume of the capsule 21 shrinks and becomes smaller, so that the compression of the battery cell B by the capsule 21 is released, and then the battery cell B is taken out from between the two adjacent capsules 21.

[0150] By opening a sac opening 212 in the sac body 21 and installing a valve body 22, the amount of fluid medium filled in the accommodating cavity 211 can be adjusted to change the volume of the sac body 21. In this way, when using the battery pressurizing device, the sac opening 212 and the valve body 22 can be used to fill the accommodating cavity 211 with fluid medium only when the battery cell B needs to be squeezed, and the accommodating cavity 211 is kept empty or filled with a small amount of fluid medium when loading and unloading the battery cell B, so as to facilitate the removal and placement of the battery cell B. In addition, the amount of fluid filled in the accommodating cavity 211 can also be adjusted through the sac opening 212 and the valve body 22, thereby adjusting the squeezing force of the sac body 21 on the battery cell B, reducing the poor appearance of the battery cell B such as the denting of the outer shell of the battery cell B due to excessive force, or lithium precipitation due to insufficient force.

[0151] Since the bladder body 21 can adaptively deform according to the surface shape of the battery cell B, and the amount of fluid filled in the accommodating cavity 211 can be adjusted through the bladder opening 212 and the valve body 22, the compatibility of the battery pressurizing device with the thickness, shape, and group margin of the battery cell B is improved, and the uniformity of the force applied to the battery cell B is improved.

[0152] In some embodiments, the valve body 22 may be an air valve, which can be inflated or exhausted. In other embodiments, the valve body 22 may be a liquid valve, which can be inflated or exhausted.

[0153] In some embodiments, the capsule 21 includes a substrate 213 and a flexible body 214 connected to the substrate 213 . The elastic modulus of the substrate 213 is greater than that of the flexible body 214 . The flexible body 214 is used to squeeze the battery cell B. The substrate 213 and the flexible body 214 enclose a receiving cavity 211 .

[0154] The material of the substrate 213 may be, but not limited to, metal, plastic, inorganic non-metal or wood, etc. The material of the flexible body 214 may be, but not limited to, silicone, cowhide, rubber or latex, etc.

[0155] The flexible body 214 is a deformable component that is difficult for fluid media to pass through.

[0156] The flexible body 214 has good elasticity, and when the internal pressure in the accommodating chamber 211 increases, the flexible body 214 can be deformed quickly to transmit the pressure to the battery cell B. The substrate 213 has great strength and is not easily deformed, which can help to achieve directional deformation of the pressurizing mechanism 2 and increase the rate of increase of the internal pressure in the accommodating chamber 211. When the flexible body 214 is worn, the flexible body 214 can be replaced, thereby reducing the maintenance cost of the battery pressurizing device.

[0157] When the battery cell B is charged and discharged, the volume of the battery cell B will expand and contract. The flexible body 214 can undergo adaptive elastic deformation according to the shape of the battery cell B, thereby maintaining the compression of the battery cell B by the capsule 21, improving the uniformity of the force on the battery cell B, and reducing the generation of compression dead angles.

[0158] In some embodiments, the sac opening 212 is disposed on the substrate 213, and the valve body 22 is mounted on the substrate 213. The substrate 213 has high strength, and when the internal pressure of the accommodating cavity 211 increases, the deformation of the sac opening 212 is small, which can reduce the risk of sealing failure at the connection between the sac opening 212 and the valve body 22.

[0159] In some embodiments, the material of the substrate 213 includes at least one of metal and plastic.

[0160] Optionally, the material of the substrate 213 includes metal, including but not limited to aluminum, aluminum alloy, stainless steel, nickel-plated steel, etc.

[0161] Optionally, the material of the substrate 213 may include any type of high temperature resistant and non-deformable engineering plastics, such as polyimide, polyphenylene ether resin, and polyetheretherketone.

[0162] Optionally, the material of the substrate 213 may include general plastic with good mechanical strength, such as polypropylene or polyethylene.

[0163] Metals and plastics are easy to process and obtain, which helps to reduce costs.

[0164] In some embodiments, the material of the flexible body 214 includes an elastic material. The elastic material is easy to expand and deform, and the deformation can be restored. The flexible body 214 is made of an elastic material and can be used multiple times, thereby increasing the service life of the battery pressurizing device.

[0165] In some embodiments, the material of the flexible body 214 includes rubber. Optionally, the material of the flexible body 214 includes at least one of silicone and ethylene propylene rubber. Optionally, the ethylene propylene rubber includes ethylene propylene diene monomer rubber. These structural materials are easy to purchase, easy to process, and have a low price, which can save costs, and have a stable structure and can be used in multiple processes.

[0166] In some embodiments, the flexible body 214 may be connected to the substrate 213 by bonding, welding, clamping or other methods.

[0167] In some embodiments, the flexible body 214 is bonded to the substrate 213. In some examples, the flexible body 214 is bonded to the substrate 213 by an adhesive. In other examples, the flexible body 214 is bonded to the substrate 213 by a lamination process or a vulcanization process. The bonding process is easy to implement and helps to achieve sealing and reduce the risk of air leakage.

[0168] In some embodiments, a concave portion 215 is disposed on one side of the substrate 213 along the first direction X. The flexible body 214 covers the concave portion 215 to form a receiving cavity 211 .

[0169] In some examples, the substrate 213 is provided with a recess 215 only on one side of the first direction X, and the pressurizing mechanism 2 includes a flexible body 214; in other examples, the substrate 213 is provided with recesses 215 on both sides along the first direction X, and the pressurizing mechanism 2 includes two flexible bodies 214, and the two flexible bodies 214 respectively cover the two recesses 215 to form two accommodating cavities 211.

[0170] The substrate 213 with higher strength can serve as a skeleton to support and shape the flexible body 214, so that the flexible body 214 remains open and stretched, thereby better contacting and squeezing the battery cell B. In addition, the substrate 213 with higher strength can also protect the flexible body 214 during installation, reducing the risk of damage to the flexible body 214.

[0171] In some embodiments, the flexible body 214 is accommodated in the recess 215, and the outer surface of the flexible body 214 is flush with the outer surface of the substrate 213 where the recess 215 is provided. The embodiment of the present application can reduce the space occupied by the capsule 21. In addition, when the battery cell B is inserted between the pressurizing mechanism 2, the embodiment of the present application can reduce the risk of the battery cell B rubbing against the flexible body 214, reduce the wear of the flexible body 214, and increase the service life of the battery pressurizing device.

[0172] In some alternative embodiments, the flexible body 214 is entirely located outside the recess 215 and attached to the outer surface of the substrate 213. The flexible body 214 may have a larger area, and attaching the flexible body 214 to the outer surface of the substrate 213 may increase the connection area between the flexible body 214 and the substrate 213, improve the connection strength between the flexible body 214 and the substrate 213, reduce the risk of separation of the flexible body 214 and the substrate 213 under the action of internal pressure, and extend the service life of the battery pressurizing device.

[0173] In some embodiments, the substrate 213 has only one side with a recess 215 along the first direction X. The at least one pressurizing mechanism 2 includes two capsules 21 arranged along the first direction X. The recesses 215 of the substrates 213 of the two capsules 21 are arranged opposite to each other along the first direction X.

[0174] Correspondingly, only one side of the bladder 21 is provided with the flexible body 214. The bladder 21 provided with the flexible body 214 only on one side may be referred to as a single-sided bladder.

[0175] The two capsules 21 of the pressurizing mechanism 2 can apply pressure to the two battery cells B respectively; the flexible bodies 214 of the two capsules 21 are arranged back to back, so the two capsules 21 expand in opposite directions, which can reduce the influence of the two capsules 21 on each other's expansion and improve the uniformity of the pressure on the battery cells B.

[0176] In some embodiments, among the plurality of pressurizing mechanisms 2 arranged along the first direction X, the pressurizing mechanisms 2 at the ends may include only one single-sided bag, and the pressurizing mechanisms 2 at the middle may include two single-sided bags.

[0177] In some embodiments, the two capsules 21 of the pressurizing mechanism 2 can be independently arranged (for example, the two are simply stacked along the first direction X), or can be fixedly connected (for example, bonded together).

[0178] Figure 6 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Figure 7 for Figure 6 Enlarged diagram of the circle.

[0179] like Figure 6 and Figure 7 As shown, in some embodiments, the pressurizing mechanism 2 includes a sac 21 and an expandable body 23. The sac 21 is provided with a receiving cavity 211, and the expandable body 23 is received in the receiving cavity 211. The expandable body 23 is configured to expand under preset conditions, and the sac 21 is used to squeeze the battery cell B.

[0180] For example, the preset conditions may be different according to different design requirements. For example, the preset conditions may depend on the material of the expandable body 23 .

[0181] Exemplarily, the preset condition may include at least one of temperature, voltage, light or water.

[0182] In the embodiment of the present application, the expansion of the expandable body 23 can realize the expansion deformation of the bladder 21, thereby causing the bladder 21 to apply pressure to the battery cell B. By controlling the expansion amount of the expandable body 23, the pressure applied by the bladder 21 to the battery cell B can be effectively controlled, thereby improving the reliability of the pressure.

[0183] In some embodiments, expandable body 23 is configured to expand upon application of voltage or upon application of heat.

[0184] The expandable body 23 may expand only when a voltage is applied, may expand only when heated, or may expand when a voltage and heating are applied simultaneously.

[0185] The energization and heating are easy to realize and control, which helps to simplify the structure of the battery pressurizing device.

[0186] In some embodiments, the expandable body 23 includes a charge-deformable material. When charged, the charge-deformable material expands; when powered off, the charge-deformable material recovers or contracts.

[0187] In some embodiments, the expandable body 23 includes at least one of a piezoelectric ceramic and a phase change material.

[0188] The piezoelectric ceramic can be deformed in response to an electrical signal. By applying a voltage to the piezoelectric ceramic, the piezoelectric ceramic can be expanded, thereby expanding the capsule 21. After power is cut off, the piezoelectric ceramic can return to its original shape.

[0189] When a material undergoes a phase change, its volume generally also changes. By changing the temperature, the phase change material can be controlled to undergo a phase change, thereby achieving expansion and contraction of the capsule 21.

[0190] In some embodiments, the pressurizing mechanism 2 further includes an electrode connector 24 mounted on the capsule 21 , and the electrode connector 24 is electrically connected to the expandable body 23 .

[0191] By providing the electrode connector 24, it is convenient to apply voltage to the expandable body 23, thereby controlling the expansion and contraction of the expandable body 23. Using voltage as a trigger adjustment for the expansion of the expandable body 23 can improve the accuracy and rapidity of control and simplify the battery pressurization device.

[0192] In some other embodiments, a heating plate (not shown) is disposed inside the pressurizing mechanism 2, and the electrode connector 24 is electrically connected to the heating plate. The heating plate can heat the expandable body 23 to expand the expandable body 23.

[0193] In some embodiments, the capsule 21 includes a substrate 213 and a flexible body 214 connected to the substrate 213 , the elastic modulus of the substrate 213 is greater than the elastic modulus of the flexible body 214 , and the flexible body 214 is used to squeeze the battery cell B. The substrate 213 and the flexible body 214 enclose a receiving cavity 211 . The expandable body 23 is received in the receiving cavity 211 .

[0194] Figure 8 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Fig. 9 for Figure 8 Enlarged diagram of the circle.

[0195] like Figure 8 and Fig. 9 As shown, in some embodiments, at least one pressurizing mechanism 2 further includes a partition 25 disposed between the two capsules 21 .

[0196] The partition 25 may be a component for separating the two capsules 21. The material of the partition 25 may be, but is not limited to, plastic, plastic, etc.

[0197] By arranging a partition 25 between the two capsules 21, the thickness of the pressurizing mechanism 2 can be further changed by using the partition 25 to adapt to the thinner battery cells B. At the same time, since the partition 25 is sandwiched between the capsules 21, the thickness of the pressurizing mechanism 2 can also be adjusted by extracting or replacing the partition 25, thereby improving the compatibility of the battery pressurizing device with battery cells B of different thickness ranges.

[0198] Fig.10 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Fig.11 for Fig.10 Enlarged diagram of the circle.

[0199] like Fig.10 and Fig.11 As shown, in some embodiments, recesses 215 are provided on both sides of the substrate 213 along the first direction X. There are two flexible bodies 214 , and the two flexible bodies 214 are provided correspondingly to the two recesses 215 .

[0200] The two flexible bodies 214 cover the two recesses 215 respectively to form two accommodating chambers 211. One capsule 21 can pressurize the battery cells B on both sides at the same time, which can reduce the number of capsules 21 of the pressurizing mechanism 2 and simplify the structure of the pressurizing mechanism 2. The substrate 213 separates the two accommodating chambers 211, so that the internal pressures of the two accommodating chambers 211 can be independently controlled.

[0201] Exemplarily, both sides of the bladder 21 can apply pressure to the battery cell B. Such a bladder 21 that can apply pressure on both sides can be called a double-sided bladder.

[0202] In some embodiments, the flexible body 214 can be deformed by inputting fluid into the accommodating cavity 211 , or by adding an expandable body 23 into the accommodating cavity 211 .

[0203] Fig.12 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Fig.13 for Fig.12 Enlarged diagram of the circle.

[0204] like Fig.12 and Fig.13 As shown, in some embodiments, the capsule 21 includes a substrate 213 and a flexible body 214 connected to the substrate 213 , the elastic modulus of the substrate 213 is greater than the elastic modulus of the flexible body 214 , and the flexible body 214 is used to squeeze the battery cell B. A receiving cavity 211 is formed inside the flexible body 214 .

[0205] The flexible body 214 has good elasticity, and when the internal pressure in the accommodating cavity 211 increases, the flexible body 214 can be deformed quickly to transmit the pressure to the battery cell B. The substrate 213 has great strength and is not easily deformed, which can help to achieve directional deformation of the pressurizing mechanism 2 and increase the rate of increase of the internal pressure in the accommodating cavity 211. The accommodating cavity 211 is formed entirely inside the flexible body 214, which can improve the sealing performance.

[0206] In some embodiments, a concave portion 215 is disposed on one side of the substrate 213 along the first direction X. At least a portion of the flexible body 214 is accommodated in the concave portion 215 , and an accommodating cavity 211 is formed inside the flexible body 214 .

[0207] In some examples, the substrate 213 is provided with a recess 215 only on one side of the first direction X, and the pressurizing mechanism 2 includes a flexible body 214; in other examples, the substrate 213 is provided with recesses 215 on both sides along the second direction Y, and the pressurizing mechanism 2 includes two flexible bodies 214, and the two flexible bodies 214 are respectively provided corresponding to the two recesses 215.

[0208] The substrate 213 with high strength can serve as a skeleton to support and shape the flexible body 214 , so that the flexible body 214 can better contact and squeeze the battery cell B. In addition, the substrate 213 with high strength can also protect the flexible body 214 during installation, reducing the risk of damage to the flexible body 214 .

[0209] In some embodiments, the substrate 213 has only one side with a recess 215 along the first direction X. The at least one pressurizing mechanism 2 includes two capsules 21 arranged along the first direction X. The recesses 215 of the substrates 213 of the two capsules 21 are arranged opposite to each other along the first direction X.

[0210] Fig.14 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Fig.15 for Fig.14 Enlarged diagram of the circle.

[0211] like Fig.14 and Fig.15 As shown, in some embodiments, the substrate 213 is provided with a receiving hole 216 , and the receiving hole 216 penetrates the receiving hole 216 along the first direction X. The capsule 21 includes two flexible bodies 214 , and the two flexible bodies 214 cover the receiving hole 216 from both sides and form a receiving cavity 211 .

[0212] One capsule 21 can apply pressure to the battery cells B on both sides at the same time, which can reduce the number of capsules 21 of the pressurizing mechanism 2; the two flexible bodies 214 are located on both sides of the same accommodating cavity 211, that is, the expansion of one accommodating cavity 211 will drive the deformation of the two flexible bodies 214, which can simplify the structure of the pressurizing mechanism 2 (for example, saving the valve body 22 or the electrode connector 24).

[0213] Fig.16 A cross-sectional schematic diagram of a pressurizing mechanism provided in another embodiment of the present application; Fig.17 for Fig.16 Enlarged diagram of the circle.

[0214] like Fig.16 and Fig.17 As shown, in some embodiments, the substrate 213 is provided with a receiving hole 216 , and the receiving hole 216 penetrates the receiving hole 216 along the first direction X. At least a portion of the flexible body 214 is received in the receiving hole 216 , and a receiving cavity 211 is formed inside the flexible body 214 .

[0215] One flexible body 214 can apply pressure to the battery cells B on both sides at the same time, which can reduce the number of capsules 21 of the pressurizing mechanism 2 and simplify the structure.

[0216] Fig.18 A schematic diagram of the structure of a pressurizing mechanism and a bracket of a battery pressurizing device provided in some embodiments of the present application; Fig.19 A schematic diagram of the structure of a bracket of a battery pressurizing device provided in some embodiments of the present application; Fig. 20 for Fig.19 A schematic structural diagram of the sub-bracket shown; Fig.21 A schematic diagram of the structure of a battery pressurizing device provided in some embodiments of the present application; Fig. 22 for Fig.21 An enlarged schematic diagram at the circle frame; Fig.23 A schematic cross-sectional view of a battery pressurizing device provided in some embodiments of the present application; Fig.24 for Fig.23 An enlarged schematic diagram at the circle frame; Fig.25 for Fig.18 Enlarged diagram of the circle.

[0217] like Figures 18 to 25 As shown, in some embodiments, the battery pressurizing device further includes a bracket 3, which is disposed between adjacent pressurizing mechanisms 2 and is used to carry the battery cells B.

[0218] The bracket 3 may be a component for supporting an object. Specifically, the bracket 3 of the embodiment of the present application is used to support the battery cell B.

[0219] As an example, the shape of the bracket 3 may be, but is not limited to, a U-shape, an L-shape or a straight line.

[0220] The material of the bracket 3 can be but is not limited to metal or plastic.

[0221] The bracket 3 may be fixed to the pressurizing mechanism 2 or may not be fixed to the pressurizing mechanism 2 .

[0222] There may be one or more brackets 3. For example, a bracket 3 is provided between any two adjacent pressurizing mechanisms 2.

[0223] By setting the bracket 3, the compatibility of the battery pressurizing device with different battery cells B can be improved. For example, when the volume of the battery cell B is relatively large, the battery cell B can be directly placed between two adjacent pressurizing mechanisms 2 and carried by the carrying mechanism 1; when the volume of the battery cell B is relatively small, the bracket 3 can be used to carry the battery cell B, and the bracket 3 is placed between two adjacent pressurizing mechanisms 2. On the one hand, the bracket 3 can limit the position of the battery cell B and limit the movement range of the battery cell B. On the other hand, the bracket 3 can lift and support the battery cell B, so that the battery cell B can better correspond to the pressurizing mechanism 2, making it convenient for the pressurizing mechanism 2 to restrain the battery cell B.

[0224] When the specifications of the battery cell B change, a different bracket 3 is replaced to make the bracket 3 compatible with the battery cell B. The embodiment of the present application can shorten the replacement time, reduce the replacement cost, and increase the application range of the battery pressurizing device.

[0225] In some embodiments, the bracket 3 is connected to the supporting mechanism 1. The supporting mechanism 1 can limit the movement of the bracket 3 and improve the stability of the battery cell B during the pressurization process.

[0226] In the first direction X, at least a portion of the bracket 3 overlaps with the flexible body 214 and is used to define a deformation region of the flexible body 214 .

[0227] The bracket 3 can limit the deformation area of ​​the flexible body 214 so that the flexible body 214 squeezes the set area of ​​the battery cell B, reducing the risk of the flexible body 214 covering other areas of the battery cell B, thereby reducing the risk of the outer shell of the battery cell B being compressed and deformed.

[0228] In some embodiments, the bracket 3 includes a bearing portion 31 and two limiting portions 32. The two limiting portions 32 are arranged opposite to each other along a second direction Y and connected to the bearing portion 31. The second direction Y is perpendicular to the first direction X. The two limiting portions 32 are located on the side of the bearing portion 31 facing the battery cell B.

[0229] It can be understood that the bearing portion 31 and the two limiting portions 32 enclose a U-shaped receiving groove 33 , and the U-shaped receiving groove 33 can be used to receive the battery cell B.

[0230] The end of the bracket 3 away from the bearing portion 31 forms an end opening of the U-shaped receiving groove 33, through which the battery cell B can be inserted into the U-shaped receiving groove 33. The bracket 3 forms side openings on both sides along the first direction X, through which the flexible body 214 can squeeze the battery cell B.

[0231] Optionally, the shape of the U-shaped receiving groove 33 is adapted to the shape of the battery cell B.

[0232] In the embodiment of the present application, the bearing portion 31 can support the battery cell B, and the limiting portion 32 can limit the battery cell B from both sides, thereby improving the stability of the battery cell B during the pressurization process.

[0233] In some embodiments, in the first direction X, at least a portion of the bearing portion 31 overlaps with the flexible body 214, and at least a portion of the limiting portion 32 overlaps with the flexible body 214. The bearing portion 31 and the limiting portion 32 can limit the deformation area of ​​the flexible body 214, thereby reducing the risk of the flexible body 214 covering the battery cell B from all sides.

[0234] In some embodiments, the bracket 3 further includes a connecting portion 34 , which is disposed on a side of the limiting portion 32 away from the battery cell B along the second direction Y, and is used to be connected to the supporting mechanism 1 .

[0235] In the embodiment of the present application, the connection portion 34 may be provided on one limiting portion 32, or may be provided on both limiting portions 32. One connection portion 34 may be provided on one limiting portion 32, or may be provided with multiple connection portions 34 at the same time.

[0236] The connection portion 34 and the supporting mechanism 1 may be integrally connected, such as by welding, or detachably connected, such as by fastener connection, plug-in connection, or snap-on connection.

[0237] By providing the connecting portion 34 , the bracket 3 can be connected to the supporting mechanism 1 , the movement of the bracket 3 on the supporting mechanism 1 can be restricted, and the stability of the battery cell B during the pressurization process can be improved.

[0238] In some embodiments, the connection portion 34 is detachably connected to the supporting mechanism 1 . In other words, the bracket 3 can be unloaded from the supporting mechanism 1 as needed.

[0239] The connection portion 34 can be detachably connected to the supporting mechanism 1 by plugging, clamping, or threading.

[0240] The bracket 3 is detachably connected to the supporting mechanism 1 , so that the bracket 3 can be replaced to match battery cells B of different specifications, thereby improving the compatibility of the battery pressurizing device.

[0241] In some embodiments, the bearing mechanism 1 includes a bearing plate 11, two end plates 12, and a connecting rod 13, wherein the two end plates 12 are connected to the bearing plate 11 and are arranged at intervals along the first direction X, and the connecting rod 13 connects the two end plates 12. The plurality of pressurizing mechanisms 2 are located on one side of the bearing plate 11 along the third direction Z and are arranged between the two end plates 12, wherein the third direction Z is perpendicular to the first direction X and the second direction Y. The connecting portion 34 is connected to the connecting rod 13.

[0242] The connecting rod 13 may be one or more.

[0243] The supporting mechanism 1 can be integrally formed, for example, the supporting mechanism 1 is a plastic part, which can directly form the supporting plate 11, the end plate 12 and the connecting rod 13 in an integral form during the injection molding process. Alternatively, the supporting mechanism 1 is an assembly, that is, obtained by assembling and combining separate supporting plates 11, end plates 12 and connecting rods 13.

[0244] In the embodiment of the present application, the two end plates 12 are connected by the connecting rod 13, which can improve the structural strength of the bearing mechanism 1. Compared with the solution of connecting the two end plates 12 by using the side plate, connecting the two end plates 12 by using the connecting rod 13 can achieve the effect of reducing weight. The connecting rod 13 can limit the bracket 3 and improve the stability of the battery cell B during the pressurization process.

[0245] In some embodiments, the bracket 3 is provided with connecting rods 13 on both sides along the second direction Y. The two limiting parts 32 are provided with connecting parts 34, and the connecting parts 34 on the two limiting parts 32 are respectively connected to the connecting rods 13 on both sides of the bracket 3. The two connecting rods 13 can limit the bracket 3 in the second direction Y.

[0246] In some embodiments, the connecting portion 34 may be fixed to the connecting rod 13 , or may be slidably connected to the connecting rod 13 along the first direction X.

[0247] Optionally, the connecting portion 34 is slidably connected to the connecting rod 13 along the first direction X, so that the position of the bracket 3 in the first direction X is adjustable, which can improve the compatibility of the battery pressurizing device.

[0248] In some embodiments, a slot 341 is provided on one side of the connecting portion 34 facing the carrier plate 11 along the third direction Z, and at least a portion of the connecting rod 13 is accommodated in the slot 341. The bracket 3 further includes a first protrusion 35 provided on the limiting portion 32, and the first protrusion 35 is located on the side of the connecting portion 34 facing the carrier plate 11. In the third direction Z, a portion of the connecting rod 13 is located between the first protrusion 35 and the connecting portion 34.

[0249] The slot 341 passes through the connecting portion 34 along the first direction X, so that the connecting rod 13 can pass through the slot 341 .

[0250] The card slot 341 has an opening on one side along the third direction Z. Exemplarily, it can be semicircular, U-shaped, rectangular or other shapes.

[0251] The portion of the connecting rod 13 at least partially received in the slot 341 can limit the connecting portion 34 in the second direction Y. The first protrusion 35 can stop the connecting rod 13 in the third direction Z, thereby reducing the risk of the connecting rod 13 escaping from the slot 341 and improving the stability of the bracket.

[0252] In some embodiments, the connecting portion 34 may be in the shape of a hook, which may be hung on the connecting rod 13. In the third direction Z, the bracket 3 may be in contact with the carrying plate 11, or may be spaced apart from the carrying plate 11.

[0253] In some embodiments, the limiting portion 32 includes an elastic arm 321 and an avoidance groove 322 located inside the elastic arm 321 , and the first protrusion 35 protrudes from a surface of the elastic arm 321 away from the avoidance groove 322 .

[0254] The avoidance groove 322 can provide an avoidance space for the swing of the elastic arm 321, so that the elastic arm 321 can drive the first protrusion 35 to move inward to a certain extent. During assembly, the bracket 3 can be inserted into the bearing mechanism 1 along the third direction Z. When the connecting rod 13 squeezes the first protrusion 35, the elastic arm 321 can be deformed toward the avoidance groove 322, so that the first protrusion 35 avoids the connecting rod 13; when the connecting rod 13 enters the card slot 341 and reaches the set position, the elastic arm 321 returns to its original state, so that the first protrusion 35 stops the connecting rod 13 in the third direction Z. By providing the elastic arm 321 and the avoidance groove 322, the assembly process of the battery pressurizing device can be simplified.

[0255] In some embodiments, the support portion 31 is provided with a first avoidance hole 311 , which penetrates the support portion 31 along a third direction Z, which is perpendicular to the first direction X and the second direction Y. The first avoidance hole 311 is used to avoid a lifting mechanism for lifting the battery cell B.

[0256] The number of the first avoidance hole 311 may be one or more.

[0257] After the battery cell B is processed, it is necessary to remove the battery cell B from the bracket 3; the embodiment of the present application provides a first avoidance hole 311 to facilitate an external lifting mechanism to lift the battery cell B from the bottom, so that the battery cell B can be quickly removed from the bracket 3, thereby improving efficiency. In addition, the first avoidance hole 311 can also play a role in weight reduction and heat dissipation.

[0258] In some embodiments, the lifting mechanism includes a lifting rod, and the lifting rod can pass through the first avoidance hole 311 and lift the battery cell B. The shape of the first avoidance hole 311 can be set according to the shape of the lifting rod.

[0259] In some embodiments, the supporting mechanism 1 includes a supporting plate 11 , which is located on a side of the supporting portion 31 away from the battery cell B. The supporting plate 11 is provided with a second avoidance hole 111 , which is used to expose the first avoidance hole 311 .

[0260] In the third direction Z, the projection of the first avoidance hole 311 is located within the projection of the second avoidance hole 111 .

[0261] The carrying plate 11 may be provided with one or more second avoidance holes 111. One second avoidance hole 111 may expose one first avoidance hole 311, or may expose multiple first avoidance holes 311 at the same time.

[0262] The second avoidance hole 111 can avoid the external lifting mechanism, reducing the risk of interference between the load-bearing plate 11 and the external lifting mechanism, and facilitating the lifting mechanism to pass through the first avoidance hole 311 and lift the battery cell B.

[0263] In some embodiments, the second avoidance hole 111 is a strip-shaped hole extending along the first direction X. The second avoidance hole 111 exposes the first avoidance holes 311 of the plurality of brackets 3 .

[0264] In some embodiments, there are multiple second avoidance holes 111 , and the multiple second avoidance holes 111 are arranged at intervals along the second direction Y.

[0265] In some embodiments, the limiting portion 32 is provided with a heat dissipation hole 323 , and the heat dissipation hole 323 passes through the limiting portion 32 along the second direction Y.

[0266] Optionally, only one of the limiting portions 32 is provided with a heat dissipation hole 323. Alternatively, both of the limiting portions 32 are provided with a heat dissipation hole 323.

[0267] By providing the heat dissipation holes 323 on the limiting portion 32 , the heat dissipation effect of the bracket 3 can be improved, and the risk of thermal runaway of the battery cell B during the formation process can be reduced. In addition, by providing the heat dissipation holes 323 , the weight of the bracket 3 can also be reduced.

[0268] In some embodiments, the bracket 3 includes a plurality of sub-brackets 4 arranged along the first direction X, each sub-bracket 4 includes a sub-bearing portion 41 and two sub-limiting portions 42, and the two sub-limiting portions 42 are arranged opposite to each other along the second direction Y and connected to the sub-bearing portion 41. The bearing portion 31 includes two sub-bearing portions 41, and each limiting portion 32 includes two sub-limiting portions 42 arranged along the first direction X.

[0269] Exemplarily, each sub-bracket 4 is a U-shaped structure.

[0270] By adjusting the number of the sub-brackets 4 , battery cells B of different thicknesses can be used, thereby improving the compatibility of the battery pressurizing device with different battery cells B.

[0271] In some embodiments, the bracket 3 includes two sub-brackets 4. The two sub-brackets 4 are opposed to each other along the first direction X.

[0272] In some embodiments, the sub-bearing portion 41 is provided with an avoidance recess 411 , and the avoidance recesses 411 of the two sub-brackets 4 are enclosed to form a first avoidance hole 311 .

[0273] In some embodiments, a heat dissipation recess 421 is disposed on the sub-limiting portion 42 , and the heat dissipation recesses 421 of the two sub-brackets 4 enclose a heat dissipation hole 323 .

[0274] In some embodiments, the sub-bracket 4 further includes a connecting portion 34 and a first protrusion 35 disposed on the sub-limiting portion 42. Each sub-limiting portion 42 is provided with an elastic arm 321 and an avoidance groove 322.

[0275] In some embodiments, the carrying mechanism 1 includes a carrying plate 11, and the pressing mechanism 2 and the bracket 3 are located on one side of the carrying plate 11 along the third direction Z, and the third direction Z is perpendicular to the first direction X. In the third direction Z, the capsule 21 abuts against the carrying plate 11, and at least a portion of the capsule 21 is located between the bracket 3 and the carrying plate 11.

[0276] In the process of removing the battery cell B from the bracket 3, the bracket 3 can limit the capsule 21 in the third direction Z, reduce the range of movement of the capsule 21 under the action of the friction between the battery cell B and the capsule 21, reduce the risk of the capsule 21 detaching from the supporting mechanism 1, and improve the reliability of the battery pressurizing device.

[0277] In some embodiments, the substrate 213 has a positioning recess 213a at one end away from the carrier 11, and the positioning recess 213a is recessed relative to the surface of the substrate 213 facing the bracket 3. The bracket 3 includes a second protrusion 36, at least part of which is accommodated in the positioning recess 213a.

[0278] The substrate 213 may have one or more positioning recesses 213 a. In some examples, the substrate 213 may have more than one positioning recesses 213 a, and each positioning recess 213 a is correspondingly provided with a second convex portion 36 .

[0279] The positioning recess 213 a opens on the end surface of the substrate 213 away from the carrier plate 11 , so that the second protrusion 36 can be inserted into the positioning recess 213 a along the third direction Z.

[0280] In the embodiment of the present application, the second protrusion 36 can limit the capsule 21 in the third direction Z, reduce the risk of the capsule 21 detaching from the supporting mechanism 1, and improve the reliability of the battery pressurizing device. By providing the positioning recess 213a, the requirement for the maximum size of the bracket 3 along the third direction Z can be reduced, and the volume and weight of the bracket 3 can be reduced.

[0281] In some embodiments, a surface of the substrate 213 facing the bracket 3 is provided with a plurality of positioning recesses 213 a , and the plurality of positioning recesses 213 a are arranged at intervals along the second direction Y. Each positioning recess 213 a accommodates a second protrusion 36 .

[0282] The second protrusion 36 extending into the plurality of positioning recesses 213 a can limit the capsule 21 in the second direction Y, thereby improving the stability of the capsule 21 .

[0283] The brackets 3 located on both sides of the capsule 21 can limit the capsule 21 in the first direction X, the second protrusion 36 of the bracket 3 can limit the capsule 21 in the second direction Y, and the supporting plate 11 and the second protrusion 36 of the bracket 3 can limit the capsule 21 in the third direction Z. The capsule 21 of the embodiment of the present application can be positioned by the bracket 3 and the supporting plate 11, without setting an additional structure to fix to the supporting mechanism 1 or the bracket 3, thereby simplifying the structure of the capsule 21.

[0284] In some embodiments, two positioning recesses 213 a are provided on the surface of the substrate 213 facing the bracket 3 . The two positioning recesses 213 a are provided at both ends of the substrate 213 along the second direction Y and open on the end surface of the substrate 213 along the second direction Y.

[0285] In some embodiments, the sub-bracket 4 includes two second protrusions 36 , and the two second protrusions 36 are respectively connected to the two sub-limiting portions 42 .

[0286] In some embodiments, the base plate 213 of the capsule 21 may also be fixedly connected to a sub-bracket 4, for example, the base plate 213 of the capsule 21 is fixedly connected to a sub-bracket 4 via a fastener. A capsule 21 and a sub-bracket 4 may be used as a whole.

[0287] An embodiment of the present application also provides a battery production system, which includes the battery pressurizing device provided by any of the aforementioned embodiments.

[0288] In some embodiments, the battery production system further includes a fluid delivery mechanism, which is connected to the capsule 21 and is used to deliver fluid into the accommodating cavity 211 of the capsule 21 .

[0289] Optionally, the fluid delivery mechanism includes a gas delivery device.

[0290] In some embodiments, the battery production system further includes a control power supply, which is used to connect to the electrode connector 24 of the capsule 21 .

[0291] In some embodiments, the battery production system further includes a processing device for performing specific processing on the battery cell B. 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 B during the formation process of the battery cell B. 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 B.

[0292] In some embodiments, the battery production system further includes a lifting mechanism, which is used to pass through the second avoidance hole 111 and the first avoidance hole 311 and lift the battery cell B in the bracket 3 .

[0293] Reference Figure 1-5 , Figure 18-25 An embodiment of the present application provides a battery pressurizing device, which includes a carrying mechanism 1, multiple pressurizing mechanisms 2 and multiple brackets 3.

[0294] The bearing mechanism 1 comprises a bearing plate 11 , two end plates 12 and a plurality of connecting rods 13 . The two end plates 12 are arranged at intervals along a first direction X and fixed to the bearing plate 11 . Each connecting rod 13 extends along the first direction X and connects the two end plates 12 .

[0295] A plurality of pressurizing mechanisms 2 are arranged between two end plates 12 along the first direction X. Battery cells B are placed between adjacent pressurizing mechanisms 2 .

[0296] Each pressurizing mechanism 2 includes a capsule 21. The capsule 21 includes a substrate 213 and a flexible body 214. The substrate 213 is provided with a recess 215 on one side along the first direction X. The flexible body 214 is connected to the substrate 213 and covers the recess 215 to enclose the substrate 213 to form a receiving cavity 211. The elastic modulus of the substrate 213 is greater than the elastic modulus of the flexible body 214.

[0297] The base plate 213 is provided with a bag opening 212 connected to the accommodating cavity 211. The pressurizing mechanism 2 also includes a valve body 22 provided at the bag opening 212. The valve body 22 is used to connect with the fluid conveying mechanism. The fluid conveying mechanism can inject fluid into the accommodating cavity 211 through the valve body 22 and the bag opening 212, so that the flexible body 214 is deformed and squeezes the battery cell B.

[0298] Among the multiple pressurizing mechanisms 2 arranged along the first direction X, the pressurizing mechanisms 2 at both ends include one capsule 21 , and the other pressurizing mechanisms 2 include two capsules 21 . The flexible bodies 214 of the two capsules 21 of the pressurizing mechanisms 2 are arranged opposite to each other along the first direction X.

[0299] A bracket 3 is provided between any two adjacent pressurizing mechanisms 2 in the first direction X, and the bracket 3 is used to carry the battery cell B.

[0300] The bracket 3 includes two sub-brackets 4 arranged along the first direction X, each sub-bracket 4 includes a sub-bearing portion 41 and two sub-limiting portions 42, and the two sub-limiting portions 42 are arranged opposite to each other along the second direction Y and connected to the sub-bearing portion 41. The second direction Y is perpendicular to the first direction X. The two sub-limiting portions 42 are located on the side of the sub-bearing portion 41 facing the battery cell B.

[0301] The sub-bearing portions 41 of the two sub-brackets 4 abut against each other and are used to bear the battery cell B. The sub-limiting portions 42 of the two sub-brackets 4 abut against each other and are used to limit the battery cell B in the second direction Y.

[0302] The sub-carrying portion 41 is provided with an escape recess 411 , and the escape recesses 411 of the two sub-brackets 4 are enclosed to form a first escape hole 311 .

[0303] The plurality of brackets 3 are located on one side of the carrier plate 11 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. The carrier plate 11 is provided with a second avoidance hole 111, and the second avoidance hole 111 is used to expose the first avoidance hole 311. An external lifting mechanism can lift the battery cell B in the bracket 3 through the second avoidance hole 111 and the first avoidance hole 311.

[0304] The sub-bracket 4 further includes a connecting portion 34 disposed on the sub-limiting portion 42 , and the connecting portion 34 is connected to the connecting rod 13 .

[0305] The base plate 213 has a positioning recess 213a at one end away from the carrier plate 11, and the positioning recess 213a is recessed relative to the surface of the base plate 213 facing the bracket 3. The sub-bracket 4 includes a second protrusion 36, at least part of which is accommodated in the positioning recess 213a.

[0306] 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, battery cells are placed between adjacent pressurizing mechanisms, and the pressurizing mechanisms are configured to compress the battery cells by expansion.

2. The battery pressurizing device according to claim 1, characterized in that: The pressurizing mechanism comprises a capsule, wherein a receiving cavity is provided inside the capsule, wherein the receiving cavity is used to communicate with a fluid conveying mechanism, and the fluid conveying mechanism is used to convey fluid to the receiving cavity; The bladder is used for squeezing the battery cell.

3. The battery pressurizing device according to claim 2, characterized in that: The sac body further includes a sac opening connected to the accommodating cavity, and the pressurizing mechanism further includes a valve body installed at the sac opening, and the valve body is used to be connected to the fluid conveying mechanism.

4. The battery pressurizing device according to claim 1, characterized in that: The pressurizing mechanism comprises a sac and an expandable body, wherein a receiving cavity is provided inside the sac, and the expandable body is received in the receiving cavity; The expandable body is configured to expand under a preset condition, and the bladder is used to compress the battery cell.

5. The battery pressurizing device according to claim 4, characterized in that: The expandable body is configured to expand upon application of voltage or upon application of heat.

6. The battery pressurizing device according to claim 5, characterized in that: The expandable body includes at least one of a piezoelectric ceramic and a phase change material.

7. The battery pressurizing device according to claim 5 or 6, characterized in that: The pressurizing mechanism further includes an electrode connector mounted on the sac, wherein the electrode connector is electrically connected to the expandable body.

8. The battery pressurizing device according to any one of claims 2 to 7, characterized in that: The capsule includes a substrate and a flexible body connected to the substrate, the elastic modulus of the substrate is greater than the elastic modulus of the flexible body, and the flexible body is used to squeeze the battery cell; The substrate and the flexible body enclose the accommodating cavity, or the accommodating cavity is formed inside the flexible body.

9. The battery pressurizing device according to claim 8, characterized in that: A concave portion is provided on one side of the substrate along the first direction; The flexible body covers the recess to form the accommodation cavity; or, at least a portion of the flexible body is accommodated in the recess, and the interior of the flexible body forms the accommodation cavity.

10. The battery pressurizing device according to claim 9, characterized in that: Along the first direction, the recess is provided on only one side of the substrate; At least one of the pressurizing mechanisms includes two capsules arranged along the first direction; the recessed portions of the substrates of the two capsules are arranged opposite to each other along the first direction.

11. The battery pressurizing device according to claim 10, characterized in that: At least one of the pressurizing mechanisms further includes a partition disposed between the two bladders.

12. The battery pressurizing device according to claim 9, characterized in that: The recessed portions are disposed on both sides of the substrate along the first direction; There are two flexible bodies, and the two flexible bodies are arranged correspondingly to the two recessed parts.

13. The battery pressurizing device according to claim 8, characterized in that: The substrate is provided with a receiving hole, and the receiving hole penetrates the receiving hole along the first direction; The capsule includes two flexible bodies, which cover the accommodating hole from two sides respectively and form the accommodating cavity; or, at least part of the flexible body is accommodated in the accommodating hole, and the accommodating cavity is formed inside the flexible body.

14. The battery pressurizing device according to any one of claims 8 to 13, characterized in that: The battery pressurizing device further includes a bracket, which is disposed between adjacent pressurizing mechanisms and is used to support the battery cells.

15. The battery pressurizing device according to claim 14, characterized in that: The bracket is connected to the carrying mechanism.

16. The battery pressurizing device according to claim 14 or 15, characterized in that: In the first direction, at least a portion of the bracket overlaps with the flexible body and is used to define a deformation area of ​​the flexible body.

17. The battery pressurizing device according to any one of claims 14 to 16, characterized in that: The bracket includes a bearing portion and two limiting portions, the two limiting portions are arranged opposite to each other along a second direction and connected to the bearing portion, the second direction is perpendicular to the first direction, and the two limiting portions are located on a side of the bearing portion facing the battery cell.

18. The battery pressurizing device according to claim 17, characterized in that: The bracket further includes a connecting portion, which is disposed on a side of the limiting portion away from the battery cell along the second direction, and is used to be connected to the supporting mechanism.

19. The battery pressurizing device according to claim 18, characterized in that: The bearing mechanism comprises a bearing plate, two end plates and a connecting rod, the two end plates are connected to the bearing plate and are spaced apart along the first direction, and the connecting rod connects the two end plates; The plurality of pressurizing mechanisms are located on one side of the bearing plate along a third direction and are arranged between the two end plates, and the third direction is perpendicular to the first direction and the second direction; The connecting portion is connected to the connecting rod.

20. The battery pressurizing device according to claim 19, characterized in that: A slot is provided on one side of the connecting portion facing the carrying plate along the third direction, and at least a portion of the connecting rod is accommodated in the slot; The bracket further comprises a first protrusion arranged on the limiting portion, wherein the first protrusion is located on a side of the connecting portion facing the bearing plate; in the third direction, a portion of the connecting rod is located between the first protrusion and the connecting portion.

21. The battery pressurizing device according to claim 20, characterized in that: The limiting portion includes an elastic arm and an avoidance groove located inside the elastic arm, and the first convex portion protrudes from a surface of the elastic arm away from the avoidance groove.

22. The battery pressurizing device according to any one of claims 17 to 21, characterized in that: The bearing portion is provided with a first avoidance hole, the first avoidance hole penetrates the bearing portion along a third direction, and the third direction is perpendicular to the first direction and the second direction; The first avoidance hole is used to avoid a lifting mechanism for lifting the battery cell.

23. The battery pressurizing device according to claim 17, characterized in that: The bearing mechanism comprises a bearing plate, and the bearing plate is located on a side of the bearing portion away from the battery cell; The bearing plate is provided with a second avoidance hole, and the second avoidance hole is used to expose the first avoidance hole.

24. The battery pressurizing device according to any one of claims 17 to 23, characterized in that: The limiting portion is provided with a heat dissipation hole, and the heat dissipation hole penetrates the limiting portion along the second direction.

25. The battery pressurizing device according to any one of claims 17 to 24, characterized in that: The bracket includes a plurality of sub-brackets arranged along the first direction, each of the sub-brackets includes a sub-bearing portion and two sub-limiting portions, and the two sub-limiting portions are arranged opposite to each other along the second direction and connected to the sub-bearing portion; The bearing portion includes two sub-bearing portions, and each of the limiting portions includes two sub-limiting portions arranged along the first direction.

26. The battery pressurizing device according to any one of claims 14 to 25, characterized in that: The bearing mechanism comprises a bearing plate, the pressing mechanism and the bracket are located on one side of the bearing plate along a third direction, and the third direction is perpendicular to the first direction; In the third direction, the capsule abuts against the carrying plate, and at least a portion of the capsule is located between the bracket and the carrying plate.

27. The battery pressurizing device according to claim 26, characterized in that: The substrate is provided with a positioning recess at one end away from the carrying plate, and the positioning recess is recessed relative to the surface of the substrate facing the bracket; The bracket includes a second protrusion, at least a portion of which is received in the positioning recess.

28. The battery pressurizing device according to claim 27, characterized in that: A plurality of positioning recesses are provided on a surface of the substrate facing the bracket, and the plurality of positioning recesses are arranged at intervals along the second direction; and each positioning recess accommodates the second protrusion.

29. A battery production system, characterized in that: Comprising a battery pressurizing device according to any one of claims 1-28.

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