restraining device

Abstract

The embodiment of the present application provides a restraining device applied to a battery cell to be injected with electrolyte, which can improve the use performance of the battery cell. The restraining device comprises a plurality of restraining plates arranged at intervals along a first direction and a driving component, the plurality of restraining plates comprise adjacent first and second restraining plates, a first accommodating cavity is formed between the first and second restraining plates, all the battery cell is accommodated in the first accommodating cavity, the first direction is perpendicular to the direction of gravity, the driving component penetrates the plurality of restraining plates in sequence along the first direction, the driving component is a screw structure, and the screw structure rotates in the first direction to adjust the displacement of the first and second restraining plates in the first direction.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a restraint device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery manufacturing, the electrolyte injection process refers to injecting electrolyte into the interior of a battery cell using an injection device to wet the electrode components inside the cell. For battery cells with thin outer casings, the electrolyte injection process can cause deformation of the casing, reducing the performance of the battery cell. Therefore, improving the performance of this battery cell has become a pressing technical problem to be solved in this field. Utility Model Content

[0004] This application provides a restraint device applied to a battery cell to be injected with electrolyte, which can improve the performance of the battery cell.

[0005] In a first aspect, this application provides a restraint device applied to a battery cell to be injected with electrolyte. The restraint device includes: a plurality of restraint plates spaced apart along a first direction, the plurality of restraint plates including adjacent first restraint plates and second restraint plates, a first receiving cavity formed between the first restraint plates and the second restraint plates, the entire battery cell being received in the first receiving cavity, the first direction being perpendicular to the direction of gravity; and a driving component that sequentially passes through the plurality of restraint plates along the first direction, the driving component being a screw structure that rotates in the first direction to adjust the displacement of the first restraint plates and the second restraint plates in the first direction.

[0006] In this embodiment, the restraint device is configured to include multiple restraint plates and a driving component arranged at intervals along a first direction. The multiple restraint plates include adjacent first restraint plates and second restraint plates, and a first receiving cavity is formed between the first restraint plates and the second restraint plates. The entire battery cell is accommodated in the first receiving cavity. The driving component is a screw structure that rotates in the first direction to adjust the displacement of the first restraint plates and the second restraint plates in the first direction. This reduces the impact of the electrolyte on the battery cell's casing under gravity during the electrolyte injection process and before the formation stage, thereby reducing the risk of deformation of the battery cell's casing and improving the battery cell's performance and service life. It also improves the battery cell's assembly performance.

[0007] In some embodiments, the restraint device further includes a support plate attached to one side of the plurality of restraint plates along the direction of gravity, wherein the first restraint plate, the second restraint plate, and the support plate form the first receiving cavity.

[0008] In this embodiment, the restraint device is configured to also include a support plate, which is attached to one side of the plurality of restraint plates along the direction of gravity, and the first restraint plate, the second restraint plate and the support plate form the first receiving cavity, so as to facilitate the assembly of the battery cell into the first receiving cavity, and at the same time to improve the structural strength of the restraint device, thereby improving the performance of the restraint device.

[0009] In some embodiments, the restraint device further includes a limiting member housed in the first receiving cavity. The limiting member includes a first limiting member and a second limiting member spaced apart along a second direction. The first limiting member and the second limiting member are attached to the support plate along the gravity direction. A second receiving cavity is formed between the first restraint plate, the second restraint plate, the first limiting member, the second limiting member and the support plate. The second receiving cavity is located within the first receiving cavity, and at least a portion of the battery cell is housed in the second receiving cavity.

[0010] In this embodiment, the restraint device is configured to include a limiting member housed in the first receiving cavity, and the limiting member is configured to include a first limiting member and a second limiting member spaced apart along a second direction. The first limiting member and the second limiting member are attached to the support plate along the direction of gravity. A second receiving cavity is formed between the first restraint plate, the second restraint plate, the first limiting member, the second limiting member, and the support plate. The second receiving cavity is located within the first receiving cavity, and at least a portion of the battery cell is housed in the second receiving cavity, so as to facilitate the assembly of the battery cell into the second receiving cavity and reduce the displacement of the battery cell in the second direction, thereby improving the restraint performance of the restraint device and effectively reducing the risk of deformation of the battery cell's casing, thereby improving the performance and service life of the battery cell.

[0011] In some embodiments, the entire battery cell is housed within the second receiving cavity.

[0012] In this embodiment of the application, by setting the entire battery cell to be housed in the second receiving cavity, the displacement of the battery cell in the second direction is further reduced, making it easier to assemble the battery cell into the second receiving cavity, thereby further improving the restraint performance of the restraint device, effectively reducing the risk of deformation of the battery cell's shell, and thus improving the performance and service life of the battery cell.

[0013] In some embodiments, the limiting member is fixedly connected to the support plate.

[0014] In this embodiment of the application, by fixing the limiting component to the support plate, the structural strength of the restraint device is improved, and the assembly of the battery cell is facilitated, thereby improving the restraint performance of the restraint device.

[0015] In some embodiments, the battery cell includes two first walls perpendicular to the first direction and opposite to each other. The two first walls are respectively close to two surfaces of the first restraint plate and the second restraint plate facing the battery cell. The first wall is the wall with the largest area of ​​the battery cell.

[0016] In this embodiment, the battery cell includes two first walls perpendicular to the first direction and opposite to each other. The two first walls are respectively close to the two surfaces of the first restraint plate and the second restraint plate facing the battery cell. By setting the first wall as the wall with the largest area of ​​the battery cell, at least a part of the battery cell can be fixed in the first receiving cavity, thereby improving the restraint performance of the restraint device on the battery cell. At the same time, the flatness of the first wall of the battery cell can be improved, thereby improving the performance of the battery cell.

[0017] In some embodiments, the battery cell includes a casing, the maximum thickness D1 of which satisfies: 0.1mm≤D1≤0.5mm.

[0018] In this embodiment of the application, by setting the maximum thickness D1 of the battery cell's outer shell to 0.1mm≤D1≤0.5mm, the risk of deformation of the battery cell's outer shell is effectively reduced during the electrolyte injection process for battery cells with thinner outer shells, thereby improving the battery cell's performance and service life.

[0019] In some embodiments, the material of the housing is steel, and the maximum thickness D1 of the housing satisfies: 0.2mm≤D1≤0.3mm; or, the material of the housing is titanium alloy, and the maximum thickness D1 of the housing satisfies: 0.1mm≤D1≤0.25mm.

[0020] In this embodiment, by setting the material of the outer casing to steel and setting the maximum thickness D1 of the outer casing to satisfy: 0.2mm≤D1≤0.3mm, or by setting the material of the outer casing to titanium alloy and setting the maximum thickness D1 of the outer casing to satisfy: 0.1mm≤D1≤0.25mm, the risk of deformation of the outer casing of the battery cell can be effectively reduced during the electrolyte injection process for battery cells with outer casings of different materials, thereby improving the performance and service life of the battery cell.

[0021] In some embodiments, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate and the edge of the battery cell satisfies: 5mm ≤ D2 ≤ 30mm.

[0022] In this embodiment of the application, on a plane perpendicular to the first direction, by setting the minimum dimension D2 between the edge of the restraint plate and the edge of the battery cell to satisfy: 5mm≤D2≤30mm, the restraint performance and assembly performance of the restraint device are taken into account. During the process of injecting electrolyte into the battery cell, the risk of deformation of the battery cell shell can be reduced, thereby improving the performance and service life of the battery cell.

[0023] In some embodiments, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate and the edge of the battery cell satisfies: 10mm≤D2≤20mm.

[0024] In this embodiment of the application, on a plane perpendicular to the first direction, by setting the minimum dimension D2 between the edge of the restraint plate and the edge of the battery cell to satisfy: 10mm≤D2≤20mm, the restraint performance and assembly performance of the restraint device are further balanced. During the process of injecting electrolyte into the battery cell, the risk of deformation of the battery cell shell can be effectively reduced, thereby improving the performance and service life of the battery cell.

[0025] In some embodiments, the minimum dimension D3 between the side of the restraint plate facing the battery cell and the side of the battery cell facing the restraint plate satisfies: 1mm≤D3≤10mm.

[0026] In this embodiment, by setting the minimum dimension D3 between the side of the restraint plate facing the battery cell and the side of the battery cell facing the restraint plate to satisfy: 1mm≤D3≤10mm, it is possible to balance the restraint performance of the restraint device and the flatness of the outer surface of the battery cell's shell. During the process of injecting electrolyte into the battery cell, the risk of deformation of the battery cell's shell can be effectively reduced, thereby improving the performance and service life of the battery cell.

[0027] In some embodiments, the minimum dimension D3 between the side of the restraint plate facing the battery cell and the side of the battery cell facing the restraint plate satisfies: 3mm≤D3≤5mm.

[0028] In this embodiment, by setting the minimum dimension D3 between the side of the restraint plate facing the battery cell and the side of the battery cell facing the restraint plate to satisfy 3mm≤D3≤5mm, it is possible to further balance the restraint performance of the restraint device and the flatness of the outer surface of the battery cell's shell. During the process of injecting electrolyte into the battery cell, the risk of deformation of the battery cell's shell can be effectively reduced, thereby improving the performance and service life of the battery cell.

[0029] In some embodiments, a pressure sensor is provided on the surface of the restraint plate facing the battery cell, and the pressure sensor is used to monitor the pressure distribution on the surface of the battery cell facing the restraint plate.

[0030] In this embodiment, a pressure sensor is provided on the surface of the restraint plate facing the battery cell, and the pressure sensor is used to monitor the pressure distribution on the surface of the battery cell facing the restraint plate, so as to obtain the flatness of the outer surface of the battery cell's casing based on the pressure sensor, thereby improving the flatness of the outer surface of the battery cell's casing and thus improving the performance of the battery cell. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0034] Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application.

[0035] Figure 4 This is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0036] Figure 5 This is a schematic diagram of the restraint device provided in one embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the restraint device provided in another embodiment of this application.

[0038] Figure 7This is a schematic diagram of the restraint device provided in another embodiment of this application.

[0039] Figure 8 This is a schematic diagram of the restraint device provided in another embodiment of this application.

[0040] Figure 9 This is a partial cross-sectional schematic diagram of a restraint device provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Casing; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Housing shell; 212-End cap; 222-Electrode tab; 222a-Positive electrode tab; 222b-Negative electrode tab; 213-Pressure relief mechanism; 214-Electrode... Extreme element; 214a-first electrode terminal; 214b-second electrode terminal; 215-first wall; 23-transfer component; 50-accommodating cavity; 60-restraint device; 610-restraint plate; 611-first restraint plate; 612-second restraint plate; 70-first accommodating cavity; 620-driving component; 630-support plate; 640-limiting component; 641-first limiting component; 642-second limiting component; 80-second accommodating cavity.

[0042] The accompanying drawings are not drawn to scale. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0049] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0050] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0051] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0052] In this embodiment, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery device in this embodiment can also be called a battery.

[0053] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0054] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0055] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0067] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0068] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0069] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0070] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0071] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0072] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0073] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0074] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0075] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0076] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0077] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0078] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0079] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0080] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0081] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0082] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0083] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0084] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0085] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0086] The battery device in this embodiment can also be referred to as an energy storage device. This energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0087] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0088] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0089] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0090] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0091] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0092] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0093] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and Ethernet and fiber optic conversion modules.

[0094] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0095] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0096] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0097] In battery manufacturing, the electrolyte injection process refers to injecting electrolyte into the interior of a battery cell using an injection device to wet the electrode components inside. For battery cells with thin outer casings, the electrolyte injection process can cause deformation of the casing, resulting in localized bulges under the weight of the electrolyte. This leads to a higher amount of residual gas inside the battery cell, resulting in higher internal pressure during actual use, reducing the battery cell's performance and lifespan, and also decreasing its assembly performance. Therefore, improving the performance of this battery cell has become a pressing technical problem in this field.

[0098] Therefore, this application provides a restraint device for a battery cell to be injected with electrolyte. The restraint device includes: a plurality of restraint plates spaced apart along a first direction, the plurality of restraint plates including adjacent first restraint plates and second restraint plates, a first receiving cavity formed between the first restraint plates and the second restraint plates, the entire battery cell being received in the first receiving cavity, the first direction being perpendicular to the direction of gravity; and a driving component that sequentially passes through the plurality of restraint plates along the first direction, the driving component being a screw structure that rotates in the first direction to adjust the displacement of the first restraint plates and the second restraint plates in the first direction. Thus, in this embodiment of the application, by configuring the restraint device to include a plurality of restraint plates and a driving component arranged at intervals along a first direction, the plurality of restraint plates include adjacent first restraint plates and second restraint plates, and a first receiving cavity is formed between the first restraint plates and the second restraint plates, in which the entire battery cell is received. The driving component is a screw structure that rotates in the first direction to adjust the displacement of the first restraint plates and the second restraint plates in the first direction. This reduces the impact of the electrolyte on the battery cell's casing under the influence of gravity during the process of injecting electrolyte into the battery cell and before the formation stage, thereby reducing the risk of deformation of the battery cell's casing and improving the battery cell's performance and service life, as well as its assembly performance.

[0099] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0100] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0101] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0102] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0103] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0104] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include multiple battery cells 20. The battery device 10 may also include a housing 11 (or cover), which has a hollow interior structure, and the multiple battery cells 20 are housed within the housing 11. For example, the multiple battery cells 20 may be connected in parallel, series, or a mixed configuration and then placed inside the housing 11.

[0105] like Figure 2As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0106] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0107] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0108] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0109] Figure 3This diagram shows an exploded view of the battery cell 20 provided in one embodiment of the present application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving cavity 50, and the electrode assembly 22 is placed in the receiving cavity 50 within the housing 21. The housing 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with at least one opening; the end cap 212 is used to fasten with the shell 211 to form the housing 21 with the closed receiving cavity 50.

[0110] In some embodiments, the end cap 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the end cap 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0111] It should be understood that if the end cap 212 is a plate-like structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the end cap 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the end cap 212 can be set as two, with the two end caps 212 respectively covering the openings at both ends of the shell 211.

[0112] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0113] It should be understood that the end cap 212 in this embodiment is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the shell 211 has a cuboid structure, and the end cap 212 has a rectangular plate structure that is adapted to the shell 211.

[0114] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may be the same as or different from that of the housing 211; the materials of the different walls of the housing 211 may also be the same or different.

[0115] The end cap 212 in this embodiment can be any wall of the outer shell 21. For example, the end cap 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap 212 can also be other structures. For example, the end cap 212 can also be a groove with an opening to cover the opening of the housing 211. This embodiment is not limited to this.

[0116] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figures 3 to 4 As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, if the first electrode terminal 214a is a positive electrode terminal, it is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22; if the second electrode terminal 214b is a negative electrode terminal, it is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The first electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, as may the negative electrode terminal 214b and the negative electrode tab 222b. Exemplarily, the first electrode terminal 214a may be electrically connected to the positive electrode tab 222a via an adapter 23, and the second electrode terminal 214b may be electrically connected to the negative electrode tab 222b via an adapter 23. It should be understood that in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as electrode tab 222.

[0117] In this embodiment, the wall of the housing 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20. Figure 3 and Figure 4The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 is a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0118] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0119] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0120] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0121] The pressure relief mechanism 213 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0122] Figure 5 A schematic diagram of the restraint device 60 provided in one embodiment of this application is shown.

[0123] In some implementations, such as Figures 3 to 5 As shown, the restraint device 60 is applied to a battery cell 20 to be injected with electrolyte. The restraint device 60 includes a plurality of restraint plates 610 spaced apart along a first direction and a driving component 620. The plurality of restraint plates 610 include adjacent first restraint plates 611 and second restraint plates 612. A first receiving cavity 70 is formed between the first restraint plates 611 and the second restraint plates 612. The entire battery cell 20 is received in the first receiving cavity 70. The first direction is perpendicular to the direction of gravity. The driving component 620 passes through the plurality of restraint plates 610 sequentially along the first direction. The driving component 620 is a screw structure. The screw structure rotates in the first direction to adjust the displacement of the first restraint plates 611 and the second restraint plates 612 in the first direction.

[0124] It should be understood that the restraint device 60 in this embodiment can be used in the electrolyte injection stage of the battery cell 20, or the restraint device 60 can also be used in the process of injecting electrolyte into the battery cell 20 before the formation stage. Specifically, after the process of injecting electrolyte into the battery cell 20 using the restraint device 60 in this embodiment, the battery cell 20 can be sealed with adhesive pins, and then the battery cell 20 can be removed from the restraint device 60 and proceeded to subsequent processes, such as the formation process.

[0125] It should also be understood that, for ease of description, three directions are defined herein: a first direction, a second direction, and a third direction. The first direction can be the arrangement direction of the plurality of restraint plates 610, and it can be perpendicular to the direction of gravity. For example, the first direction can be a horizontal direction. Alternatively, the first direction can be the thickness direction of the battery cell 20, or it can be the length direction of the restraint device 60, or it can be... Figure 5 The direction X shown is perpendicular to the first direction and the direction of gravity. For example, the second direction can be the length direction of the battery cell 20, or the width direction of the restraint device 60, or... Figure 5The direction Y shown is perpendicular to the first and second directions. For example, this third direction could be the height direction of the battery cell 20, or the height direction of the restraint device 60, or parallel to the direction of gravity, or it could be... Figure 5 The direction Z is shown in the diagram.

[0126] It should also be understood that the restraint device 60 in the embodiments of this application includes a plurality of restraint plates 610 arranged at intervals along a first direction. The distance between any two adjacent restraint plates 610 can be set according to actual needs. For example, the plurality of restraint plates 610 can be arranged at equal intervals along the first direction.

[0127] It should also be understood that a first receiving cavity 70 can be formed between the first restraint plate 611 and the second restraint plate 612 in the embodiments of this application. The first receiving cavity 70 can be used to receive the battery cell 20, and the first receiving cavity 70 can be a receiving cavity with an opening at at least one end. It should also be understood that the material of the restraint plate 610 in the embodiments of this application can be set according to actual needs. For example, the material of the restraint plate 610 can be set as steel, aluminum or titanium alloy.

[0128] It should also be understood that the driving component 620 in this embodiment can sequentially penetrate multiple restraint plates 610 along a first direction to control the displacement of the first restraint plate 611 and the second restraint plate 612 in that first direction. For example, the driving component 620 can be... Figure 5 The screw structure shown is rotatable in a first direction to adjust the displacement of the first restraint plate 611 and the second restraint plate 612 in that first direction, thereby restraining the battery cell 20.

[0129] In this embodiment, the restraint device 60 is configured to include a plurality of restraint plates 610 spaced apart along a first direction and a driving component 620. The plurality of restraint plates 610 include adjacent first restraint plates 611 and second restraint plates 612, and a first receiving cavity 70 is formed between the first restraint plates 611 and the second restraint plates 612. The entire battery cell 20 is accommodated in the first receiving cavity 70. The driving component 620 is used to control the displacement of the first restraint plates 611 and the second restraint plates 612 in the first direction, so as to reduce the impact of the electrolyte on the outer shell 21 of the battery cell 20 under the influence of gravity during the process of injecting electrolyte into the battery cell 20 and before the formation stage, that is, to reduce the risk of deformation of the outer shell 21 of the battery cell 20, thereby improving the performance and service life of the battery cell 20, and at the same time improving the assembly performance of the battery cell 20.

[0130] Figure 6A schematic diagram of the restraint device 60 provided in another embodiment of this application is shown.

[0131] In some embodiments, such as Figure 6 As shown, the restraint device also includes a support plate 630, which is attached to one side of the plurality of restraint plates 610 along the direction of gravity. The first restraint plate 611, the second restraint plate 612 and the support plate 630 form the first receiving cavity 70.

[0132] It should be understood that the support plate 630 is attached to one side of the plurality of restraint plates 610 along the direction of gravity, which means that the restraint plates 610 and the support plate 630 are movably connected so that the plurality of restraint plates 610 can be displaced along the first direction under the drive of the drive member 620 to restrain the battery cell 20.

[0133] It should also be understood that the first restraint plate 611, the second restraint plate 612, and the support plate 630 form the first receiving cavity 70, which can be... Figure 6 The groove structure shown is for accommodating the battery cell 20 within the first receiving cavity 70.

[0134] In this embodiment, the restraint device 60 is configured to also include a support plate 630, which is attached to one side of the plurality of restraint plates 610 along the direction of gravity. The first restraint plate 611, the second restraint plate 612 and the support plate 630 form the first receiving cavity 70, so as to facilitate the assembly of the battery cell 20 into the first receiving cavity 70, and at the same time, to improve the structural strength of the restraint device 60, thereby improving the performance of the restraint device 60.

[0135] Figure 7 A schematic diagram of the restraint device 60 provided in another embodiment of this application is shown. Figure 8 A schematic diagram of the restraint device 60 provided in another embodiment of this application is shown.

[0136] In some embodiments, such as Figure 7 and Figure 8 As shown, the restraint device 60 further includes a limiting member 640 housed in the first receiving cavity 70. The limiting member 640 includes a first limiting member 641 and a second limiting member 642 spaced apart along a second direction. The first limiting member 641 and the second limiting member 642 are attached to the support plate 630 along the gravity direction. A second receiving cavity 80 is formed between the first restraint plate 611, the second restraint plate 612, the first limiting member 641, the second limiting member 642 and the support plate 630. The second receiving cavity 80 is located within the first receiving cavity 70, and at least a portion of the battery cell 20 is housed in the second receiving cavity 80.

[0137] It should be understood that the limiting component 640 in the embodiments of this application can be detachably connected or fixedly connected to the support plate 630. For example, when the limiting component 640 can be detachably connected to the support plate 630, the limiting component 640 can be snapped into the support plate 630.

[0138] It should also be understood that the distance between the first limiting component 641 and the second limiting component 642 in the second direction can be set according to actual needs. For example, the distance between the first limiting component 641 and the second limiting component 642 in the second direction can be set according to the size of the battery cell 20.

[0139] In this embodiment, the restraint device 60 is configured to include a limiting member 640 housed in the first receiving cavity 70. The limiting member 640 includes a first limiting member 641 and a second limiting member 642 spaced apart along a second direction. The first limiting member 641 and the second limiting member 642 are attached to the support plate 630 along the direction of gravity. The first restraint plate 611, the second restraint plate 612, the first limiting member 641, and the second limiting member 642 are also included. A second receiving cavity 80 is formed between the support plate 630 and the first receiving cavity 70. The second receiving cavity 80 is located within the first receiving cavity 70, and at least a portion of the battery cell 20 is received in the second receiving cavity 80 to facilitate the assembly of the battery cell 20 into the second receiving cavity 80. At the same time, it reduces the displacement of the battery cell 20 in the second direction, thereby improving the restraint performance of the restraint device 60 and effectively reducing the risk of deformation of the outer shell 21 of the battery cell 20, thereby improving the performance and service life of the battery cell 20.

[0140] In some embodiments, the entire battery cell 20 is housed within the second receiving cavity 80. Thus, in this embodiment, by accommodating the entire battery cell 20 within the second receiving cavity 80, the displacement of the battery cell 20 in the second direction is further reduced, facilitating the assembly of the battery cell 20 into the second receiving cavity 80. This further improves the restraint performance of the restraint device 60, effectively reducing the risk of deformation of the battery cell 20's outer casing 21, thereby improving the performance and lifespan of the battery cell 20.

[0141] In some embodiments, the limiting member 640 is fixedly connected to the support plate 630.

[0142] It should be understood that when the limiting component 640 is fixedly connected to the support plate 630, the limiting component 640 may be bonded or welded to the support plate 630.

[0143] In this embodiment of the application, by fixing the limiting component 640 to the support plate 630, the structural strength of the restraint device 60 is improved, and the assembly of the battery cell 20 is facilitated, thereby improving the restraint performance of the restraint device 60.

[0144] Figure 9 A partial cross-sectional schematic diagram of a restraint device 60 provided in another embodiment of this application is shown.

[0145] In some embodiments, such as Figure 8 and Figure 9 As shown, the battery cell 20 includes two first walls 215 perpendicular to the first direction and opposite to each other. The two first walls 215 are respectively close to the two surfaces of the first restraint plate 611 and the second restraint plate 612 facing the side of the battery cell 20. The first wall 215 is the wall with the largest area of ​​the battery cell 20.

[0146] In this embodiment, the battery cell 20 includes two first walls 215 perpendicular to the first direction and opposite to each other. The two first walls 215 are respectively close to the two surfaces of the first restraint plate 611 and the second restraint plate 612 facing the battery cell 20. By setting the first wall 215 as the wall with the largest area of ​​the battery cell 20, at least a part of the battery cell 20 can be fixed to the first receiving cavity 70, thereby improving the restraint performance of the restraint device 60 on the battery cell 20. At the same time, the flatness of the first wall 215 of the battery cell 20 can be improved, thereby improving the performance of the battery cell 20.

[0147] In some embodiments, such as Figure 9 As shown, the battery cell 20 includes a housing 21, and the maximum thickness D1 of the housing 21 satisfies: 0.1mm≤D1≤0.5mm.

[0148] For example, the maximum thickness D1 of the outer shell 21 can be set to: 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., or its value is within the range obtained by any combination of the above two values.

[0149] In this embodiment of the application, by setting the maximum thickness D1 of the outer shell 21 of the battery cell 20 to 0.1mm≤D1≤0.5mm, the risk of deformation of the outer shell 21 of the battery cell 20 is effectively reduced during the process of injecting electrolyte into the battery cell 20, thereby improving the performance and service life of the battery cell 20.

[0150] In some embodiments, the material of the outer shell 21 is steel, and the maximum thickness D1 of the outer shell 21 satisfies: 0.2mm≤D1≤0.3mm; or, the material of the outer shell 21 is titanium alloy, and the maximum thickness D1 of the outer shell 21 satisfies: 0.1mm≤D1≤0.25mm.

[0151] For example, when the material of the outer casing 21 is steel, the maximum thickness D1 of the outer casing 21 can be set to: 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, etc., or its value is within the range obtained by any combination of the above two values.

[0152] For example, when the material of the outer shell 21 is set to titanium alloy, the maximum thickness D1 of the outer shell 21 can be set to: 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, etc., or its value is within the range obtained by any combination of the above two values.

[0153] In this embodiment, by setting the material of the outer casing 21 to steel and setting the maximum thickness D1 of the outer casing 21 to satisfy: 0.2mm≤D1≤0.3mm, or by setting the material of the outer casing 21 to titanium alloy and setting the maximum thickness D1 of the outer casing 21 to satisfy: 0.1mm≤D1≤0.25mm, for battery cells 20 with outer casings 21 of different materials, the risk of deformation of the outer casing 21 of the battery cell 20 can be effectively reduced during the process of injecting electrolyte into the battery cell 20, thereby improving the performance and service life of the battery cell 20.

[0154] In some embodiments, such as Figure 9 As shown, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 satisfies: 5mm≤D2≤30mm.

[0155] It should be understood that the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 can refer to the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 in any direction on a plane perpendicular to the first direction or direction X. For example, Figure 9 The figure shows the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 on a plane perpendicular to the first direction and along direction Z.

[0156] For example, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 can be set to: 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc., or its value is within the range obtained by any combination of the above two values.

[0157] In this embodiment, on a plane perpendicular to the first direction, by setting the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 to satisfy: 5mm≤D2≤30mm, the restraint performance and assembly performance of the restraint device 60 are taken into account. During the process of injecting electrolyte into the battery cell 20, the risk of deformation of the outer shell 21 of the battery cell 20 can be reduced, thereby improving the performance and service life of the battery cell 20.

[0158] In some embodiments, such as Figure 9 As shown, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 satisfies: 10mm≤D2≤20mm.

[0159] For example, on a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 can be set to: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc., or its value is within the range obtained by any combination of the above two values.

[0160] In this embodiment, on a plane perpendicular to the first direction, by setting the minimum dimension D2 between the edge of the restraint plate 610 and the edge of the battery cell 20 to satisfy: 10mm≤D2≤20mm, the restraint performance and assembly performance of the restraint device 60 are further balanced. During the process of injecting electrolyte into the battery cell 20, the risk of deformation of the outer shell 21 of the battery cell 20 can be effectively reduced, thereby improving the performance and service life of the battery cell 20.

[0161] In some embodiments, such as Figure 9 As shown, the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610 satisfies: 1mm≤D3≤10mm.

[0162] It should be understood that by setting the dimensions between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610, that is, the outer surface of the outer casing 21 of the battery cell 20 and the restraint plate 610 do not directly contact each other, the risk of the restraint plate 610 over-restraining the battery cell 20 and causing damage to the outer casing 21 is reduced.

[0163] For example, the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610 can be set to: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or its value is within the range obtained by any combination of the above two values.

[0164] In this embodiment, by setting the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610 to satisfy: 1mm≤D3≤10mm, it is possible to balance the restraint performance of the restraint device 60 and the flatness of the outer surface of the outer shell 21 of the battery cell 20. During the process of injecting electrolyte into the battery cell 20, the risk of deformation of the outer shell 21 of the battery cell 20 can be effectively reduced, thereby improving the performance and service life of the battery cell 20.

[0165] In some embodiments, such as Figure 9 As shown, the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610 satisfies: 3mm≤D3≤5mm.

[0166] For example, the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell 20 facing the restraint plate 610 can be set to: 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, etc., or its value is within the range obtained by any combination of the above two values.

[0167] In this embodiment, by setting the minimum dimension D3 between the side of the restraint plate 610 facing the battery cell 20 and the side of the battery cell facing the restraint plate to satisfy 3mm≤D3≤5mm, the restraint performance of the restraint device 60 and the flatness of the outer surface of the outer shell 21 of the battery cell 20 can be further balanced. During the process of injecting electrolyte into the battery cell 20, the risk of deformation of the outer shell 21 of the battery cell 20 can be effectively reduced, thereby improving the performance and service life of the battery cell 20.

[0168] In some embodiments, a pressure sensor is provided on the surface of the restraint plate 610 facing the battery cell 20, and the pressure sensor is used to monitor the pressure distribution on the surface of the battery cell 20 facing the restraint plate 610.

[0169] It should be understood that the pressure sensor can be fixedly connected to the surface of the restraint plate 610 facing the battery cell 20. For example, the pressure sensor can be bonded to the surface of the restraint plate 610 facing the battery cell 20.

[0170] It should also be understood that the pressure sensor in the embodiments of this application may be a flexible thin-film pressure sensor, so as to facilitate the surface of the restraint plate 610 facing the battery cell 20, while reducing the impact on the flatness of the outer surface of the battery cell 20.

[0171] For example, the force F1 applied by the restraint plate 610 to the first wall 215 of the outer casing 21 of the battery cell 20 in this embodiment can be: 10N≤F1≤500N. For example, the force F1 applied by the restraint plate 610 to the first wall 215 of the outer casing 21 of the battery cell 20 can be set to: 10N, 20N, 30N, 40N, 50N, 60N, 70N, 80N, 90N, 100N, 200N, 300N, 400N, 500N, etc., or its value is within the range obtained by any combination of the above two values.

[0172] In other embodiments, the force F1 applied by the restraint plate 610 to the first wall 215 of the outer casing 21 of the battery cell 20 in this application embodiment can also be set to: 50N≤F1≤200N.

[0173] In this embodiment, a pressure sensor is provided on the surface of the restraint plate 610 facing the battery cell 20, and the pressure sensor is used to monitor the pressure distribution on the surface of the battery cell 20 facing the restraint plate 610, so as to obtain the flatness of the outer surface of the outer shell 21 of the battery cell 20 according to the pressure sensor, thereby improving the flatness of the outer surface of the outer shell 21 of the battery cell 20, and thus improving the performance of the battery cell 20.

[0174] According to some embodiments of this application, see Figures 3 to 8This application provides a restraint device 60, which is applied to a battery cell 20 to be injected with electrolyte. The restraint device 60 includes a plurality of restraint plates 610 arranged at intervals along a first direction and a driving component 620. The plurality of restraint plates 610 include adjacent first restraint plates 611 and second restraint plates 612. A first receiving cavity 70 is formed between the first restraint plates 611 and the second restraint plates 612. The entire battery cell 20 is received in the first receiving cavity 70. The first direction is perpendicular to the direction of gravity. The driving component 620 passes through the plurality of restraint plates 610 sequentially along the first direction. The driving component 620 is a screw structure. The screw structure rotates in the first direction to adjust the displacement of the first restraint plates 611 and the second restraint plates 612 in the first direction. The restraint device further includes a support plate 630, which is attached to one side of the plurality of restraint plates 610 along the direction of gravity. The first restraint plate 611, the second restraint plate 612, and the support plate 630 form the first receiving cavity 70. The restraint device 60 also includes a limiting member 640 housed in the first receiving cavity 70. The limiting member 640 includes a first limiting member 641 and a second limiting member 642 spaced apart along a second direction. The first limiting member 641 and the second limiting member 642 are attached to the support plate 630 along the direction of gravity. A second receiving cavity 80 is formed between the first restraint plate 611, the second restraint plate 612, the first limiting member 641, the second limiting member 642, and the support plate 630. The second receiving cavity 80 is located within the first receiving cavity 70, and the entire battery cell 20 is housed in the second receiving cavity 80.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A restraint device, characterized in that, The restraint device is applied to a battery cell (20) to which electrolyte is to be injected, and includes: Multiple restraint plates (610) are spaced apart along a first direction. Each restraint plate (610) includes an adjacent first restraint plate (611) and a second restraint plate (612). A first receiving cavity (70) is formed between the first restraint plate (611) and the second restraint plate (612). All of the battery cells (20) are received in the first receiving cavity (70). The first direction is perpendicular to the direction of gravity. A driving component (620) passes through a plurality of restraint plates (610) sequentially along the first direction. The driving component (620) is a screw structure that rotates in the first direction to adjust the displacement of the first restraint plate (611) and the second restraint plate (612) in the first direction.

2. The restraint device according to claim 1, characterized in that, The restraint device further includes a support plate (630) attached to one side of the plurality of restraint plates (610) along the direction of gravity, wherein the first restraint plate (611), the second restraint plate (612) and the support plate (630) form the first receiving cavity (70).

3. The restraint device according to claim 2, characterized in that, The restraint device further includes a limiting member (640) housed in the first receiving cavity (70). The limiting member (640) includes a first limiting member (641) and a second limiting member (642) spaced apart along a second direction, and the first limiting member (641) and the second limiting member (642) are attached to the support plate (630) on one side along the gravity direction. A second receiving cavity (80) is formed between the first restraint plate (611), the second restraint plate (612), the first limiting member (641), the second limiting member (642) and the support plate (630). The second receiving cavity (80) is located within the first receiving cavity (70), and at least a portion of the battery cell (20) is received in the second receiving cavity (80).

4. The restraint device according to claim 3, characterized in that, All of the battery cells (20) are housed in the second receiving cavity (80).

5. The restraint device according to claim 3, characterized in that, The limiting component (640) is fixedly connected to the support plate (630).

6. The restraint device according to any one of claims 1 to 5, characterized in that, The battery cell (20) includes two first walls (215) perpendicular to the first direction and opposite to each other. The two first walls (215) are respectively close to the two surfaces of the first restraint plate (611) and the second restraint plate (612) facing the battery cell (20). The first wall (215) is the wall with the largest area of ​​the battery cell (20).

7. The restraint device according to any one of claims 1 to 5, characterized in that, The battery cell (20) includes a casing (21), and the maximum thickness D1 of the casing (21) satisfies: 0.1mm≤D1≤0.5mm.

8. The restraint device according to claim 7, characterized in that, The outer shell (21) is made of steel, and the maximum thickness D1 of the outer shell (21) satisfies: 0.2mm≤D1≤0.3mm, or the outer shell (21) is made of titanium alloy, and the maximum thickness D1 of the outer shell (21) satisfies: 0.1mm≤D1≤0.25mm.

9. The restraint device according to any one of claims 1 to 5, characterized in that, On a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate (610) and the edge of the battery cell (20) satisfies: 5mm≤D2≤30mm.

10. The restraint device according to claim 9, characterized in that, On a plane perpendicular to the first direction, the minimum dimension D2 between the edge of the restraint plate (610) and the edge of the battery cell (20) satisfies: 10mm≤D2≤20mm.

11. The restraint device according to any one of claims 1 to 5, characterized in that, The minimum dimension D3 between the side of the restraint plate (610) facing the battery cell (20) and the side of the battery cell (20) facing the restraint plate (610) satisfies: 1mm≤D3≤10mm.

12. The restraint device according to claim 11, characterized in that, The minimum dimension D3 between the side of the restraint plate (610) facing the battery cell (20) and the side of the battery cell (20) facing the restraint plate (610) satisfies: 3mm≤D3≤5mm.

13. The restraint device according to any one of claims 1 to 5, characterized in that, A pressure sensor is provided on the surface of the restraint plate (610) facing the battery cell (20), and the pressure sensor is used to monitor the pressure distribution on the surface of the battery cell (20) facing the restraint plate (610).

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