Battery cell, battery, electric device, method and apparatus for manufacturing battery cell

Abstract

This application provides a battery, an electrical device, a method for manufacturing the battery, and an apparatus. The battery includes: a first constraint member and a second constraint member spaced apart; a battery cell stack arranged in layers between the first and second constraint members; a fixing strap including a first end and a second end, the first end being fixed to the first constraint member; and an adjusting device installed on the second constraint member, the adjusting device being connected to the second end and adjusting the preload of the fixing strap. This application, by connecting the fixing strap with the adjusting device and adjusting the preload of the fixing strap, effectively avoids the problem of inconsistent preload of the fixing strap. By adjusting the preload of the fixing strap, the fixing strap can better balance and bear the expansion force transmitted to the first and second constraint members when the battery cells expand, effectively suppressing the battery deformation caused by the expansion of the battery cells, and thus helping to extend the battery's service life.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery, an electrical device, a method for manufacturing the battery, and equipment. 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] As usage time increases, individual battery cells will expand. This expansion can easily lead to overall battery deformation, affecting the battery's lifespan. Summary of the Invention

[0004] This application provides a battery, an electrical device, a method for manufacturing the battery, and an apparatus. The battery can effectively alleviate the problem of battery deformation and is beneficial to improving the battery's service life.

[0005] In a first aspect, this application provides a battery, comprising: a first constraint member and a second constraint member spaced apart; a battery cell group comprising a plurality of battery cells stacked between the first constraint member and the second constraint member; a fixing strap comprising a first end and a second end, the first end being fixed to the first constraint member; and an adjusting device mounted on the second constraint member, the adjusting device being connected to the second end and adjusting the preload of the fixing strap.

[0006] In the technical solution of this application embodiment, multiple battery cells are stacked between the first and second constraint members. A fixing strap is provided on the first constraint member and an adjustment device is installed on the second constraint member. The adjustment device is connected to the fixing strap and adjusts the preload of the fixing strap. This can avoid the problem of the fixing strap being too loose or too tight after assembly due to the dimensional tolerance between the fixing strap and the battery module, thereby effectively solving the problem of inconsistent preload of the fixing strap. Because the preload of the fixing strap can be adjusted by the adjustment device, the fixing strap can be adjusted to a better preload state, so that the fixing strap can provide a suitable preload for the first and second constraint members to constrain the battery cell group, and better balance and bear the expansion force transmitted to the first and second constraint members when the battery cell expands, thereby effectively suppressing the expansion of the battery cell, alleviating the battery deformation problem, and helping to extend the battery's service life. At the same time, the fixing strap and adjustment device of this application are directly set on the first and second constraint members constraining the battery cells. Compared with the battery using a winding fixing strap structure, the fixing strap space occupancy rate of the battery of this application is low, which is conducive to improving the overall energy density of the battery.

[0007] In some embodiments, the adjusting device includes a base and a drive shaft, the base being fixed to the second constraint member, the drive shaft being rotatably mounted on the base, the drive shaft being configured to connect to the second end and to adjust the preload of the fixing belt by rotation.

[0008] In the above technical solution, the adjustment device includes a base and a drive shaft rotatably mounted on the base. The pretension of the fixed belt can be adjusted by winding the fixed belt around the drive shaft and rotating the drive shaft. On the one hand, this application can control the pretension of the fixed belt by controlling the rotation angle of the drive shaft, making it easy to adjust the fixed belt to any pretension state, with strong adjustability and flexibility. On the other hand, this application adjusts the pretension of the fixed belt by rotating the drive shaft, that is, by adjusting the linear force through rotational driving force. This adjustment method has low work intensity and strong operability. At the same time, the fixed belt is wound around the drive shaft, and the drive shaft has a large force-bearing area and strong load-bearing capacity, effectively ensuring the firmness of the connection between the adjustment device and the fixed belt and the stability of the pretension adjustment.

[0009] In some embodiments, the adjusting device further includes a gear fixed to the drive shaft, and the second end is configured to mesh with the gear.

[0010] In the above technical solution, a gear is installed on the drive shaft. The connection between the fixed belt and the drive shaft is achieved by the meshing of the second end of the fixed belt with the gear. The multiple teeth of the gear provide multi-point limiting for the second end, thereby effectively improving the reliability of the connection between the fixed belt and the drive shaft and the tightness of the fixed belt wound on the drive shaft. At the same time, the multiple teeth of the gear disperse the force, reducing the risk of failure of the connection between the drive shaft and the fixed belt due to excessive local force. This effectively reduces the risk of the fixed belt detaching from the drive shaft after being stressed, which is conducive to improving the overall stability of the adjustment device.

[0011] In some embodiments, the second end is provided with a plurality of limiting grooves, which are spaced apart along the extension direction of the fixing belt, and the limiting grooves are used for the insertion of the teeth of the gear.

[0012] In the above technical solution, multiple limiting grooves are provided at intervals at the second end. The limiting grooves are for the teeth of the gear to insert into. When the preload of the fixing belt is adjusted, as the drive shaft rotates, the fixing belt is wound around the drive shaft, and the teeth of the gear are inserted into the limiting grooves at the second end to stably wind and position the second end of the fixing belt on the drive shaft.

[0013] In some embodiments, the limiting groove extends through the fixing belt along the thickness direction of the fixing belt.

[0014] In the above technical solution, the limiting groove penetrates the fixed belt along the thickness direction of the fixed belt, that is, the limiting groove has a through hole structure. This design allows the gear teeth to pass through the limiting groove to the second end to limit the second end, effectively ensuring the stability of the gear's limiting of the second end and reducing the risk of the fixed belt detaching from the drive shaft after being subjected to force.

[0015] In some embodiments, the fixing belt includes a fixed length section and an adjusting section, one end of the fixed length section is fixed to the first constraint member, the other end is connected to the adjusting section, and the limiting groove is disposed in the adjusting section.

[0016] In the above technical solution, the fixing belt can include a fixed length section and an adjusting section. The fixed length section and the adjusting section are connected to form a complete fixing belt structure. This structure makes it easy for the fixed length section and the adjusting section to be processed separately according to different processes and then integrated, which helps to reduce processing difficulty and processing cost. At the same time, this structure makes it easy for the fixed length section and the adjusting section to be processed with different materials according to different forces and different structural shapes after installation, which helps to further improve the overall performance of the steel belt structure.

[0017] In some embodiments, the drive shaft includes: a drive shaft body; and a limiting flange formed on the drive shaft body and protruding from the outer peripheral surface of the drive shaft body, the limiting flange being used to limit the axial movement of the fixing belt along the drive shaft.

[0018] In the above technical solution, the drive shaft is provided with a limiting flange. The limiting flange plays a certain guiding role in the position of the fixed belt wound on the drive shaft, which helps to improve the convenience of the fixed belt pretension adjustment operation. At the same time, the limiting flange limits the position of the fixed belt on the drive shaft, reducing the risk of the fixed belt deviating on the drive shaft, thereby helping to maintain the balance and stability of the force applied by the drive shaft to the fixed belt.

[0019] In some embodiments, one end of the drive shaft is provided with an operating part, which is used to connect to a rotation drive source.

[0020] In the above technical solution, an operating part is provided at one end of the transmission shaft. The operating part is provided to facilitate the connection of a corresponding rotation drive source. The rotation drive source acts on the operating part to drive the transmission shaft to rotate.

[0021] In some embodiments, the adjusting device further includes a check mechanism configured to allow the drive shaft to rotate in the direction of tensioning the fixing belt and to restrict the drive shaft from rotating in the direction of loosening the fixing belt.

[0022] In the above technical solution, a check mechanism is set in the adjustment device to control the loosening of the fixing belt wound on the drive shaft by limiting the rotation direction of the drive shaft. The setting of the check mechanism can effectively prevent the fixing belt from automatically loosening due to the expansion force during battery use. In addition, the design of the check mechanism allows the drive shaft to be rotated intermittently when adjusting the pretension of the fixing belt. After the rotation drive source is removed, the drive shaft can be stably stopped at the current angle, effectively ensuring the convenience and controllability of the pretension adjustment operation, especially the manual pretension adjustment operation.

[0023] In some embodiments, the check mechanism includes: a ratchet fixed to the drive shaft, the central axis of the ratchet coinciding with the central axis of the drive shaft; and a pawl mounted on the base, the pawl engaging with the ratchet, the pawl being configured to allow the ratchet to rotate in one direction.

[0024] In the above technical solution, the check mechanism adopts a ratchet and pawl mechanism. The ratchet can rotate synchronously with the drive shaft, and the pawl is movably mounted on the base. The pawl meshes with the ratchet. When the ratchet rotates in the forward direction, the teeth of the ratchet push the pawl, and the pawl is subjected to force to generate rotational displacement, disengaging from the ratchet. The ratchet can then rotate, and the teeth that exert force on the pawl move with the rotation of the ratchet until they disengage from the pawl. After disengaging, the pawl resets under the action of force and re-meets with the other teeth of the ratchet. When the ratchet is about to rotate in the reverse direction, the tooth structure of the ratchet and the pawl structure mutually restrict and limit the ratchet's reverse rotation. Its structure is mature and its performance is stable, which can effectively play the role of limiting the rotation direction of the drive shaft.

[0025] In some embodiments, the anti-return mechanism further includes an elastic element for applying an elastic force to the pawl to keep the pawl in contact with the ratchet.

[0026] In the above technical solution, the anti-return mechanism is equipped with an elastic element, which applies an elastic force to the pawl. The elastic element enables the pawl to quickly and stably reset after losing the pushing force of the ratchet, so that the pawl remains in contact with the ratchet, thereby effectively ensuring the stability of the pawl's braking of the ratchet.

[0027] In some embodiments, the first end is connected to the first constraint member by a fastener.

[0028] In the above technical solution, the first end of the fixing strap is connected to the first constraint member by a fastener, which facilitates the assembly of batteries. At the same time, the type and number of fasteners can be flexibly configured according to the stress of the fixing strap, thereby improving the reliability of the connection between the fixing strap and the first constraint member and ensuring the stability of the connection between the fixing strap and the first constraint member.

[0029] In some embodiments, multiple fixing straps and multiple adjusting devices are provided, with the multiple fixing straps distributed at intervals along an extension direction perpendicular to the fixing straps, and the fixing straps and the adjusting devices corresponding one-to-one.

[0030] In the above technical solution, multiple fixing belts and corresponding adjustment devices are arranged along the extension direction perpendicular to the fixing belt to apply multi-point pre-tightening force to the first and second constraint members, effectively improving the force coverage range and further enhancing the effect of the fixing belts and the first and second constraint members on suppressing battery expansion. More importantly, when the battery expands, the force on the first and second constraint members at different positions along the extension direction perpendicular to the fixing belt is also different. By setting multiple fixing belts with adjustable pre-tightening force, different pre-tightening forces can be applied to each fixing belt according to the different installation positions of the fixing belts. This helps to improve the degree of counteraction of the expansion force of the first and second constraint members on the battery cells, and helps to reduce the deformation of the first and second constraint members under stress, thereby reducing the amount of battery deformation and extending the battery's service life.

[0031] In some embodiments, the first constraint member and the second constraint member are spaced apart along a first direction, and the plurality of battery cells are stacked along the first direction.

[0032] In the above technical solution, the first constraint member and the second constraint member are spaced apart along the first direction, and multiple battery cells are stacked between the first constraint member and the second constraint member along the first direction. This structure makes the force direction of the first constraint member and the second constraint member under the pre-tightening force of the fixing belt the same as the force direction of the expansion force of the battery cell group, so as to better ensure the suppression effect of the first constraint member, the second constraint member and the fixing belt on battery expansion.

[0033] In some embodiments, the battery includes a plurality of battery cell groups arranged side-by-side between the first constraint member and the second constraint member along a second direction, the second direction being perpendicular to the first direction.

[0034] In the above technical solution, multiple battery cell groups are arranged side by side along the second direction between the first constraint member and the second constraint member, which is beneficial to improving the energy density of the battery.

[0035] In some embodiments, the battery further includes: a housing; a plurality of beams spaced apart within the housing and fixedly connected to the housing, with a receiving cavity formed between two adjacent beams; wherein the battery cell assembly is disposed within the receiving cavity, the first constraint member is one of the two adjacent beams, and the second constraint member is the other of the two adjacent beams.

[0036] In the above technical solution, a box is set up and beams are set up inside the box. An accommodating cavity is formed between two adjacent beams. The box plays a role in accommodating and protecting the battery structure, and the beams are used to limit and fasten the battery cells. The above technical solution installs fixing straps and adjustment devices on the beams, which can effectively improve the structural integration of the battery, thereby increasing the overall energy density of the battery. On the other hand, the beams are fixed to the box, which has strong structural rigidity, good resistance to deformation, and strong pressure resistance, which is conducive to further improving the amount of countermeasure against the expansion force of the battery cells and reducing the amount of battery deformation.

[0037] In some embodiments, the battery further includes a battery module, the battery module including the battery cell group and two end plates, the two end plates being disposed on opposite sides of the battery cell group; wherein the first constraint member is one of the two end plates, and the second constraint member is the other of the two end plates.

[0038] In the above technical solution, the end plate in the battery module plays a limiting and fastening role for multiple battery cells. This technical solution utilizes the end plate of the battery module to fix the fixing strap and adjustment device, eliminating the need to separately install the first and second constraint components, reducing the space occupancy rate of the battery, effectively saving implementation costs, and improving the convenience of installing the fixing strap and adjustment device.

[0039] Secondly, this application provides an electrical device including the battery described in the above embodiments, wherein the battery is used to provide electrical energy.

[0040] Thirdly, this application provides a method for manufacturing a battery, comprising: providing a first constraint member and a second constraint member, wherein the first constraint member and the second constraint member are spaced apart; providing a battery cell assembly, wherein the battery cell assembly includes a plurality of battery cells, wherein the plurality of battery cells are stacked and arranged between the first constraint member and the second constraint member; providing a fixing strap, wherein the fixing strap includes a first end and a second end, wherein the first end is fixed to the first constraint member; and providing an adjustment device, wherein the adjustment device is installed on the second constraint member, the second end is connected to the adjustment device, and the preload of the fixing strap is adjusted by the adjustment device.

[0041] Fourthly, this application provides a battery manufacturing apparatus, comprising: a providing module for providing a first constraint member and a second constraint member, providing a battery cell assembly, providing a fixing strap, and providing an adjusting device, wherein the first constraint member and the second constraint member are spaced apart, the battery cell assembly includes a plurality of battery cells, and the fixing strap includes a first end and a second end; and an assembly module for stacking the plurality of battery cells between the first constraint member and the second constraint member, fixing the first end to the first constraint member, installing the adjusting device on the second constraint member, connecting the second end to the adjusting device, and adjusting the preload of the fixing strap through the adjusting device. Attached Figure Description

[0042] 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.

[0043] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0044] Figure 2 Axonometric views of batteries provided in some embodiments of this application;

[0045] Figure 3 Top view of a battery provided for some embodiments of this application;

[0046] Figure 4 A front view of the fixing strap connected to the adjustment device provided in some embodiments of this application;

[0047] Figure 5 Axonometric view of a fixing strap connected to an adjustment device according to some embodiments of this application;

[0048] Figure 6 Axonometric views of the fixing strap provided for some embodiments of this application;

[0049] Figure 7 Axonometric views of the adjustment device provided in some embodiments of this application;

[0050] Figure 8 for Figure 5 A magnified view of part A shown;

[0051] Figure 9 for Figure 6 A magnified view of part B shown;

[0052] Figure 10 for Figure 6A magnified view of part C shown;

[0053] Figure 11 Exploded views of batteries provided for some embodiments of this application;

[0054] Figure 12 A schematic flowchart illustrating a battery manufacturing method provided in some embodiments of this application;

[0055] Figure 13 A schematic block diagram of a battery manufacturing apparatus provided for some embodiments of this application;

[0056] The accompanying drawings are not drawn to scale.

[0057] Marking Explanation: 1000 - Vehicle; 100 - Battery; 10 - Battery Cell Pack; 11 - Battery Cell; 20 - Housing; 21 - First Housing; 22 - Second Housing; 23 - Beam; 231 - Front Beam; 232 - Rear Beam; 30 - First Constraint; 40 - Second Constraint; 50 - Fixing Strap; 51 - Fixed Length Section; 511 - First End; 52 - Adjustment Section; 521 - Second End; 522 - Limiting Groove; 53 - Fastener; 60 - Adjustment Device; 61 - Base; 62 - Drive Shaft; 621 - Drive shaft body; 622 Limiting flange; 63 Gear; 64 Operating part; 65 Check mechanism; 651 Ratchet; 652 Pawl; 653 Elastic element; 654 Rotating shaft; 200 Controller; 300 Motor; 2000 Manufacturing equipment; 2100 First feeding device; 2200 Second feeding device; 2300 Third feeding device; 2400 Fourth feeding device; 2500 First assembly device; 2600 Second assembly device; 2700 Third assembly device. Detailed Implementation

[0058] 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 and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0065] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a signal connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0067] 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.

[0068] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0069] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. The battery may include a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0070] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector protrudes beyond the coated one, serving as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited to these.

[0071] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0072] As usage time increases, individual battery cells will expand. This expansion can easily lead to deformation of the overall battery structure, affecting the battery's lifespan.

[0073] In the early stages of the technology, the inventors used cable ties to stabilize the battery modules composed of individual battery cells. However, the method of fixing the battery modules with cable ties could not effectively alleviate the problem of battery deformation caused by the expansion of individual battery cells.

[0074] The applicant noted an anomaly during battery assembly: a mismatch between the cable ties and battery dimensions, resulting in inconsistent pre-tension after installation. The uncontrollable pre-tension of the cable ties prevented effective suppression of battery deformation. Further analysis revealed that while both the cable ties and battery modules adhere to pre-defined specifications, the cable ties themselves have dimensional tolerances, as do the battery modules. Therefore, the actual assembly results differ after the cable ties are installed, leading to either insufficient or excessive pre-tension, which in turn fails to effectively mitigate battery deformation caused by individual cell expansion.

[0075] Based on the above considerations, in order to effectively alleviate the problem of battery deformation caused by the expansion of individual battery cells, the applicant has designed a battery after research. The battery of this application arranges multiple battery cells in a stack between a first constraint member and a second constraint member, fixes a fixing strap on the first constraint member, and installs an adjustment device on the second constraint member. The pretension of the fixing strap is connected and adjusted through the adjustment device.

[0076] The battery with this structure uses an adjusting device to connect and adjust the pretension of the fixing strap, thus avoiding the problem of the fixing strap being too loose or too tight due to dimensional tolerances between the fixing strap and the battery module. This effectively solves the problem of inconsistent pretension of the fixing strap. Because the pretension of the fixing strap can be adjusted by the adjusting device, it can be adjusted to an optimal pretension state, allowing the fixing strap to provide appropriate pretension for the first and second constraint members to constrain the battery cell group. It also better balances and bears the expansion force transmitted to the first and second constraint members when the battery cell expands, thereby effectively suppressing the expansion of the battery cell, alleviating the battery deformation problem, and helping to extend the battery's service life.

[0077] Meanwhile, the fixing strap and adjustment device of this application are directly disposed on the first and second constraint members that constrain the battery cell. Compared with the battery using a winding fixing strap structure, the fixing strap space occupancy rate of the battery of this application is low, which is conducive to improving the overall energy density of the battery.

[0078] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. The power system of such electrical equipment can be composed using the batteries disclosed in this application, which can effectively improve the battery's lifespan and performance.

[0079] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] The batteries described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all electrical devices that use batteries. However, for the sake of brevity, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this application.

[0081] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 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 battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0082] In some other embodiments, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] In this application, the battery mentioned in the embodiments refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Multiple battery cells can be connected in series, parallel, or a combination thereof to directly form a battery. A combination thereof means that multiple battery cells are connected in both series and parallel configurations. Alternatively, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery cell group, and then multiple battery cell groups can be connected in series, parallel, or a combination thereof to form a battery.

[0084] Please refer to Figure 2 and Figure 3 and further refer to Figure 4 and Figure 5 , Figure 2 This is an isometric view of the battery 100 provided in some embodiments of this application. Figure 3This is a top view of the battery 100 provided in some embodiments of this application. Figure 4 This is a front view of a fixing strap connected to an adjustment device according to some embodiments of this application. Figure 5 This is an isometric view of a fixing strap connected to an adjusting device according to some embodiments of this application. The battery 100 provided in some embodiments of this application may include a first constraint member 30 and a second constraint member 40 spaced apart, a battery cell assembly 10, a fixing strap 50, and an adjusting device 60. The battery cell assembly 10 includes multiple battery cells 11, which are stacked between the first constraint member 30 and the second constraint member 40. The fixing strap 50 includes a first end 511 and a second end 521. The first end 511 is fixed to the first constraint member 30. The adjusting device 60 is mounted on the second constraint member 40 and is used to connect to the second end 521 and adjust the preload of the fixing strap 50.

[0085] The first constraint member 30 and the second constraint member 40 are used to clamp and limit the multiple battery cells 11, and to support the installation of the fixing belt 50 and the adjustment device 60. The first constraint member 30 and the second constraint member 40 can be in various structural forms, such as plate or beam. The materials of the first constraint member 30 and the second constraint member 40 can also be various, such as steel, iron, aluminum, aluminum alloy, etc.

[0086] It is understood that a battery cell group comprises multiple battery cells, which can be connected in series, parallel, or a combination thereof (a combination means that multiple battery cells are connected in both series and parallel) to form a battery cell group. The battery cell group is confined between the first and second constraint members. Alternatively, a battery can also comprise multiple battery cell groups, which can then be connected in series, parallel, or a combination thereof to form a battery. In other words, a single battery cell group or multiple battery cell groups can be positioned between the first and second constraint members. Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes.

[0087] The fixing band 50 can be a strip-like structure or a ring structure. It can be composed of multiple separate structures or a one-piece structure. The fixing band 50 can be made of metal materials with good tensile and deformation resistance, such as steel. The fixing band 50 can also be made of other materials. The fixing band 50 can be made of one material or formed by combining multiple structures of different materials.

[0088] In some embodiments of this application, the fixing strap 50 can be a strip-like structure; specifically, please refer to... Figure 6 , Figure 6The image shows an isometric view of a fixing strap provided in some embodiments of this application; the length direction of the fixing strap 50 (i.e., the "extension direction of the fixing strap 50" below) extends along a first direction X, the width direction of the fixing strap 50 extends along a second direction Y, and the thickness direction of the fixing strap 50 extends along a third direction Z.

[0089] The first end 511 of the fixing strap 50 can be connected to the first constraint member 30 by welding, riveting or other means, or it can be integrally formed with the first constraint member 30.

[0090] It is understandable that "the adjusting device 60 is used to connect with the second end 521 and adjust the pretension of the fixing strap 50" means that after the battery 100 is assembled, the second end 521 of the fixing strap 50 is connected to the adjusting device 60, and the adjusting device 60 acts on the second end 521 to connect and tighten the fixing strap 50, so that the fixing strap 50 has a pretension.

[0091] "Pre-tension force" refers to the force applied before the connection is subjected to a working load to enhance its reliability and tightness, and to prevent deformation or relative slippage between the connecting parts after the load is applied. In the embodiments of this application, before the expansion force of the battery cell 11 is applied, the fixing strap 50 is tightened by the adjusting device 60 to apply a pre-tension force to the fixing strap 50, the first constraint member 30 and the second constraint member 40, so as to reduce the amount of deformation of the first constraint member 30 and the second constraint member 40 after being subjected to the expansion force of the battery cell 11.

[0092] This application applies a pre-tightening force to the fixing strap 50, thereby enabling the fixing strap 50, the first constraint member 30, and the second constraint member 40 to share the expansion force of multiple battery cells 11, offsetting at least part of the expansion force, and thus effectively reducing the deformation of the battery 100 caused by the expansion of the battery cells 11, which is beneficial to extending the service life of the battery 100 module. The pre-tightening force of the fixing strap 50 can be flexibly adjusted by the adjusting device 60, thereby effectively avoiding the problems of the fixing strap 50 being too loose or too tight after installation, or inconsistent pre-tightening force of the fixing strap 50, caused by the dimensional tolerances of the fixing strap 50 and the battery 100 module, and ensuring that the pre-tightening function of the fixing strap 50 can be effectively exerted.

[0093] In some embodiments, please refer to Figure 7 and further refer to Figure 8 and Figure 9 , Figure 7 The following are isometric views of the adjustment device provided in some embodiments of this application. Figure 8 for Figure 5 A magnified view of part A shown below. Figure 9 for Figure 6A partial enlarged view of part B is shown. The adjustment device 60 may include a base 61 and a drive shaft 62. The base 61 is fixed to the second constraint member 40, and the drive shaft 62 is rotatably mounted on the base 61. The drive shaft 62 is configured to be connected to the second end 521 and to adjust the preload of the fixing belt 50 by rotation.

[0094] It is understood that the base 61 can be detachably installed on the second constraint member 40 by means of fastener 53. The base 61 can also be welded to the second constraint member 40 or the base 61 and the second constraint member 40 can be integrally formed. The base 61 serves to support the drive shaft 62. There are various implementation structures for the base 61, as long as it can stably connect to and support the drive shaft 62. The drive shaft 62 can be rotatably installed on the base 61 by means of bearings.

[0095] The drive shaft 62 is configured to be connected to the second end 521 and to adjust the pretension of the fixing belt 50 by rotating it. This means that the fixing belt 50 is gradually tightened by rotating the drive shaft 62 to achieve the preset pretension state.

[0096] It is understandable that the drive shaft 62 is used to connect to and wind the fixed belt 50. In order to ensure the balance of force on the fixed belt 50, the axial direction of the drive shaft 62 can extend along the width direction (i.e., the Y direction) of the fixed belt 50.

[0097] The connection between the drive shaft 62 and the second end 521 can be achieved in various ways, such as: setting a limiting part on the drive shaft 62, and quickly connecting the limiting part with the second end 521; or fixing the second end 521 to the drive shaft 62 with fasteners such as bolts 53 during battery 100 assembly; or welding the second end 521 to the drive shaft 62.

[0098] In some embodiments of this application, the connection between the drive shaft 62 and the second end 521 can be achieved by a limiting part. The limiting part can be implemented in various ways. For example, a first limiting part can be provided on the circumferential surface of the drive shaft 62, and a second limiting part that cooperates with the first limiting part can be provided on the second end 521 of the fixing belt 50. The cooperation between the first limiting part and the second limiting part can achieve a quick connection between the second end 521 and the drive shaft 62. Optionally, the first limiting part and the second limiting part can adopt a structure in which a limiting shaft and a limiting hole cooperate. Specifically, a limiting hole is provided on the second end 521, and a protruding limiting shaft is provided on the axial surface of the drive shaft 62. Alternatively, a protruding limiting shaft is provided on the second end 521, and a limiting hole is provided on the drive shaft 62. Inserting the limiting shaft into the limiting hole can achieve a quick connection between the fixing belt 50 and the drive shaft 62.

[0099] It is understandable that the limiting shaft can be a cylindrical structure, a rectangular structure, or other irregular shapes. Of course, the shape of the limiting groove 522 corresponds to and matches the shape of the limiting shaft.

[0100] The pretension of the fixed belt 50 can be adjusted by winding the fixed belt 50 around the drive shaft 62 and rotating the drive shaft 62. The pretension of the fixed belt 50 can be controlled by controlling the rotation angle of the drive shaft, making it easy to adjust the fixed belt 50 to any pretension state. It is highly adjustable and flexible. Furthermore, adjusting the pretension of the fixed belt 50 by rotating the drive force results in low work intensity and high operability. At the same time, the fixed belt 50 is wound around the drive shaft 62, which has a large force-bearing area and more balanced force distribution, effectively ensuring the stability of the connection between the adjustment device 60 and the fixed belt 50 and the pretension adjustment.

[0101] In some embodiments, the adjusting device 60 further includes a gear 63 fixed to the drive shaft 62, and a second end 521 configured to mesh with the gear 63.

[0102] Please refer to this again. Figure 7 and Figure 9 Gear 63 is fixed to transmission shaft 62, that is, gear 63 rotates under the drive of transmission shaft 62. Gear 63 meshes with second end 521. That is, as gear 63 rotates, second end 521 is wound around gear 63 and the meshing section of second end 521 and gear 63 gradually increases, fixing belt 50 gradually tightens, and preload gradually increases.

[0103] Gear 63 can be mounted on the end of drive shaft 62 or on the shaft surface of drive shaft 62. For example, Figure 7 As shown, gear 63 has a central hole, and drive shaft 62 passes through the central hole of gear 63. Gear 63 is fixed to the shaft body of drive shaft 62 and is coaxial with drive shaft 62. Gear 63 is located on the shaft body of drive shaft 62. This structure enables drive shaft 62 to provide stable support for gear 63, effectively ensuring the stability of gear 63 after being subjected to force.

[0104] A gear 63 is installed on the drive shaft 62. The teeth of the gear 63 provide multi-point limiting for the second end 521, thereby effectively improving the reliability of the connection between the fixed belt 50 and the drive shaft 62 and the tightness of the fixed belt 50 wound on the drive shaft 62. At the same time, the multiple teeth of the gear 63 disperse the force, reducing the risk of failure of the connection between the drive shaft 62 and the fixed belt 50 due to excessive local force at the connection point. This effectively reduces the risk of the fixed belt 50 detaching from the drive shaft 62 after being subjected to force, which is beneficial to improving the overall stability of the adjustment device 60.

[0105] Please refer to this again. Figure 6 And further refer to Figure 9In some embodiments, the second end 521 is provided with a plurality of limiting grooves 522, which are spaced apart along the extension direction of the fixing belt 50. The limiting grooves 522 are used for the teeth of the gear 63 to be inserted.

[0106] Understandably, as gear 63 rotates, the multiple limiting grooves 522 of the second end 521 correspond one by one with the teeth of gear 63. The teeth of gear 63 are inserted one by one into the corresponding limiting grooves 522 to achieve meshing between gear 63 and the second end 521. As gear 63 rotates, the meshing section between gear 63 and the second end 521 gradually increases, and the second end 521 gradually wraps around gear 63, causing the fixing belt 50 to gradually tighten and the preload to gradually increase.

[0107] There are various implementations for the meshing connection between the gear 63 and the second end 521. For example, in some other embodiments, the surface of the second end 521 facing the gear 63 may have a plurality of protruding, spaced teeth, so that the second end 521 forms a rack-like structure. When the second end 521 is connected to the gear 63, the teeth of the second end 521 mesh with the teeth of the gear 63.

[0108] Multiple limiting grooves 522 are provided at intervals at the second end 521. The limiting grooves 522 are for the teeth of the gear 63 to insert into. When adjusting the preload of the fixing belt 50, as the drive shaft 62 rotates, the fixing belt 50 is wound around the drive shaft 62, and the teeth of the gear 63 are inserted into the limiting grooves 522 of the second end 521 to stably wind and position the second end 521 of the fixing belt 50 on the drive shaft 62.

[0109] In some embodiments, the limiting groove 522 extends through the fixing belt 50 along the thickness direction of the fixing belt 50.

[0110] Specifically, the thickness direction of the fixing band 50 extends along the third direction Z, and the limiting groove 522 penetrates the fixing band 50 along the third direction Z.

[0111] It is understandable that the limiting groove 522 penetrates the fixing belt 50 along the thickness direction of the fixing belt 50, that is, the limiting groove 522 is in the form of a through hole. When assembling the battery 100, the second end 521 can be sleeved on the teeth of the gear 63 through the limiting groove 522 to realize the connection between the second end 521 and the drive shaft 62, making the connection operation more convenient. In addition, the teeth of the gear 63 penetrate the second end 521, which further improves the stability of the connection and limiting of the gear 63 to the second end 521, thereby reducing the risk of the fixing belt 50 detaching from the drive shaft 62. At the same time, since the teeth of the gear 63 penetrate the second end 521, the second end 521 can be wrapped in multiple layers on the gear 63, which is beneficial to improving the adjustment range of the fixing belt 50.

[0112] In some embodiments of this application, the gear 63 may have a certain width, that is, the gear 63 may extend a certain distance along the axial direction of the transmission shaft 62, so as to ensure the shear strength of the teeth of the gear 63 and improve the load-bearing capacity of the teeth of the gear 63.

[0113] Accordingly, based on the implementation of "the axial direction of the drive shaft 62 extends along the width direction (i.e., the second direction Y) of the fixed belt 50", the width direction of the limiting groove 522 extends along the width direction (i.e., the second direction Y) of the fixed belt 50 to form a strip structure, and the width of the limiting groove 522 is adapted to the width of the gear 63.

[0114] In other embodiments, the gear 63 may also adopt other implementation structures, such as forming multiple protrusions on the drive shaft 62, each protrusion extending radially along the drive shaft 62, and the multiple protrusions being evenly distributed around the circumference of the drive shaft 62, the protrusions being used to insert into the limiting groove 522. Each protrusion may be a cylindrical structure, a triangular structure, a trapezoidal structure, etc.

[0115] In some embodiments, the fixing strap 50 includes a fixed length section 51 and an adjusting section 52. One end of the fixed length section 51 is fixed to the first constraint member 30, and the other end is connected to the adjusting section 52. A limiting groove 522 is provided in the adjusting section 52.

[0116] It is understandable that the adjusting section 52 is used to connect with the adjusting device 60. The fixed length section 51 and the adjusting section 52 can be connected by riveting, screwing, welding, gluing, or other methods.

[0117] The adjusting section 52 and the fixed-length section 51 can be made of the same material, for example, both the adjusting section 52 and the fixed-length section 51 can be made of steel. Of course, the adjusting section 52 and the fixed-length section 51 can also be made of different materials. For example, if the adjusting section 52 needs to be wound around the drive shaft 62 after being assembled, then the adjusting section 52 can be made of a material with better deformability than the fixed-length section 51. For example, the fixed-length section 51 can be made of steel, and the adjusting section 52 can be made of plastic. The fixed-length section 51 and the adjusting section 52 can be processed separately and then assembled.

[0118] The fixed belt 50 adopts a structure in which a fixed length section 51 and an adjusting section 52 are connected. This facilitates the individual processing of the fixed length section 51 and the adjusting section 52 according to their different processes, which helps to reduce processing difficulty and processing cost. At the same time, this structure allows the fixed length section 51 and the adjusting section 52 to be processed with different materials according to different forces and different structural shapes after installation, which helps to further improve the overall performance of the steel belt structure.

[0119] In some embodiments, the drive shaft 62 includes a drive shaft body 621 and a limiting flange 622. The limiting flange 622 is formed on the drive shaft body 621 and protrudes from the outer peripheral surface of the drive shaft body 621. The limiting flange 622 is used to limit the axial movement of the fixing belt 50 along the drive shaft 62.

[0120] Understandably, the drive shaft body 621 is rotatably mounted on the base 61, and two limiting flanges 622 can be provided on the drive shaft body 621 at intervals along the axial direction of the drive shaft body 621. The fixing belt 50 is wrapped between the two limiting flanges 622 of the drive shaft body 621 to restrict the movement of the fixing belt 50 along the axial direction of the drive shaft body 621.

[0121] For example, please refer to again Figure 7 One end of the drive shaft body 621 is rotatably mounted on the base 61, and the other end of the drive shaft body 621 forms a limiting flange 622. The base 61 and the limiting flange 622 work together to restrict the fixed belt 50 from moving axially along the drive shaft body 621.

[0122] Understandably, based on the implementation of "gear 63 fixed to drive shaft 62", if two limiting flanges 622 are provided at intervals along the axial direction of drive shaft body 621, then gear 63 is located between the two limiting flanges 622; if base 61 and a limiting flange 622 work together to restrict the movement of fixing belt 50 along the axial direction of drive shaft body 621, then gear 63 is located between limiting flange 622 and base 61.

[0123] The limiting flange 622 plays a certain guiding and foolproof role in the movement of the fixed belt 50 wound around the drive shaft 62, which makes it easy for the operator to quickly and accurately pull the fixed belt 50 to the accurate position on the drive shaft 62 for pre-tightening. This helps to improve the convenience of the pre-tightening adjustment operation of the fixed belt 50. At the same time, the limiting flange 622 limits the position of the fixed belt 50 on the drive shaft 62, preventing the fixed belt 50 from deviating during the pre-tightening process.

[0124] In some embodiments, one end of the drive shaft 62 is provided with an operation part 64, which is used to connect to a rotation drive source.

[0125] A rotation drive source refers to the source of force that provides rotational drive for the rotation of a drive shaft. The rotation drive source can be an electric drive mechanism or a manual drive by the operator using tools. It is understood that the implementation structure of the operating part will be different depending on the rotation drive source or the operating tool used. For example, if the drive shaft can be driven to rotate by a small motor, then the operating part of the drive shaft should be adapted to the output end of the small motor.

[0126] For example, such as Figure 9As shown, the operating part 64 can be a structure similar to a bolt cap that is compatible with a wrench. The operating part 64 can be hexagonal, hexagonal or other conventional structures that can be used with a wrench or other tools. When assembling the battery 100, the operator uses the operating tool to turn the operating part 64, thereby driving the drive shaft 62 to rotate.

[0127] The operation unit 64 is designed to facilitate connection to a corresponding rotation drive source, which acts on the operation unit 64 to drive the transmission shaft 62 to rotate.

[0128] In some embodiments, the adjusting device 60 further includes a check mechanism 65 configured to allow the drive shaft 62 to rotate in the direction of tensioning the fixing belt 50 and to restrict the drive shaft 62 from rotating in the direction of loosening the fixing belt 50.

[0129] It is understandable that the drive shaft 62 is rotatably mounted on the base 61, so the drive shaft 62 can rotate forward and backward around its own central axis. The fixing belt 50 is wound around the drive shaft 62. If the drive shaft 62 can tighten the fixing belt 50 by rotating forward around its central axis, then the drive shaft 62 can loosen the fixing belt 50 by rotating backward around its central axis. The loosened fixing belt 50 will lose its pretension and will not be able to achieve the purpose of suppressing the deformation of the battery 100. The function of the check mechanism 65 is to limit the rotation direction of the drive shaft 62, that is, to allow the drive shaft 62 to rotate forward (tighten the fixing belt 50) and to limit the drive shaft 62 to rotate backward (loosen the fixing belt 50), thereby maintaining the pretension of the fixing belt 50.

[0130] A check mechanism 65 is provided in the adjustment device 60. By limiting the rotation direction of the drive shaft 62, the fixing belt 50 wound on the drive shaft 62 is prevented from loosening. The check mechanism 65 can effectively prevent the fixing belt 50 from automatically loosening due to expansion force during the use of the battery 100. Furthermore, the design of the check mechanism 65 allows the drive shaft 62 to be rotated intermittently when adjusting the pretension of the fixing belt 50. After the rotation drive source is removed, the drive shaft 62 can stop at the current angle, effectively ensuring the convenience and controllability of the pretension adjustment operation, especially the manual adjustment operation.

[0131] In some embodiments, please refer again Figure 7 and Figure 8 The check mechanism 65 may include a ratchet 651 and a pawl 652. The ratchet 651 is fixed to the drive shaft 62, and the central axis of the ratchet 651 coincides with the central axis of the drive shaft 62. The pawl 652 is mounted on the base 61 and engages with the ratchet 651. The pawl 652 is configured to allow the ratchet 651 to rotate in one direction.

[0132] It is understood that the ratchet 651 is coaxially connected to the drive shaft 62, and the ratchet 651 can rotate synchronously with the drive shaft 62. The pawl 652 can be rotatably mounted on the base 61 via the rotating shaft 654, the rotation axis of the rotating shaft 654 being parallel to the rotation axis of the drive shaft 62, and the pawl 652 engaging with the ratchet 651.

[0133] When the ratchet 651 rotates in the forward direction, the teeth of the ratchet 651 push the pawl 652. The pawl 652, under the force, rotates out of rotation relative to the shaft 654, thus disengaging from the ratchet 651. The ratchet 651 then rotates. During this process, the teeth of the ratchet 651 that apply force to the pawl 652 are displaced as the ratchet 651 rotates, eventually disengaging from the pawl 652. After losing the force, the pawl 652 resets under the reset force and re-engages with the other teeth of the ratchet 651. When the ratchet 651 is about to rotate in the reverse direction, the tooth structure of the ratchet 651 and the structure of the pawl 652 mutually restrict and lock each other to limit the reverse rotation of the ratchet 651.

[0134] It is understandable that "ratchet 651 rotates forward" and "ratchet 651 rotates backward" should be interpreted broadly. The introduction of forward and backward rotation is only to explain the difference in the direction of rotation when ratchet 651 rotates around its own central axis. If forward rotation is understood as clockwise rotation, then backward rotation is counterclockwise rotation. Forward rotation and backward rotation can be interchanged in actual application structures.

[0135] In this embodiment, ratchet 651 is connected to drive shaft 62, and a check mechanism 65 including ratchet 651 and pawl 652 is used to allow drive shaft 62 to rotate in the direction of tensioning the fixing belt 50 and to restrict drive shaft 62 from rotating in the direction of loosening the fixing belt 50. Therefore, it can be understood that when drive shaft 62 rotates in the direction of tensioning the fixing belt 50, it drives ratchet 651 to rotate in the aforementioned forward direction; when drive shaft 62 rotates in the direction of loosening the fixing belt 50, it drives ratchet 651 to rotate in the aforementioned reverse direction.

[0136] The check mechanism 65 adopts a ratchet 651 and pawl 652 structure, which has a mature structure and stable performance, and can effectively restrict the rotation direction of the drive shaft 62.

[0137] In some other embodiments, the check mechanism 65 may also be other structures. For example, the check mechanism may include a rack, a central gear, and a stop sleeve. The central gear is fixed on the drive shaft 62, and the central axis of the central gear coincides with the central axis of the drive shaft 62. The stop sleeve is fixedly installed on the base 61. The rack passes through the brake sleeve and the teeth of the rack mesh with the central gear. At the same time, the rack is provided with helical teeth, and the extension direction of the helical teeth is consistent with the extension direction of the teeth of the rack. An elastic piece is provided inside the stop sleeve, and the elastic piece abuts against and meshes with the helical teeth.

[0138] The engagement relationship between the stop sleeve and the helical teeth can be referred to as that of the cable tie mechanism in conventional technology. That is, multiple rows of helical teeth are arranged in parallel along the length of the cable tie. One end of the cable tie is connected to the stop sleeve. The stop sleeve is provided with an elastic piece that can mesh with the helical teeth. By inserting the end of the cable tie away from the stop sleeve into the stop sleeve and continuously tightening it, the limiting space of the closed loop formed by the cable tie can be continuously reduced. Because the helical teeth and the elastic piece mesh, the cable tie cannot be pulled out of the stop sleeve in the opposite direction.

[0139] When used as a check mechanism, the intermediate gear is coaxially connected to the drive shaft 62. The drive shaft 62 drives the intermediate gear to rotate synchronously. The rack meshes with the intermediate gear, so the intermediate gear can drive the rack to move linearly. Since the intermediate gear passes through the stop sleeve, and the helical teeth on the rack mesh with the elastic plate inside the stop sleeve, the stop sleeve can control the linear movement direction of the rack, allowing only unidirectional movement of the rack.

[0140] When applied to the embodiments of this application, when the drive shaft 62 rotates in the direction of tensioning the fixing belt 50, it drives the intermediate gear to rotate. The intermediate gear drives the rack to move linearly. At this time, the stop sleeve allows the rack to move linearly. When the drive shaft 62 is about to rotate in the direction of loosening the fixing belt 50, the intermediate gear is about to rotate in the opposite direction and applies a force to the rack, driving the rack to move linearly in the opposite direction. At this time, the helical teeth on the rack mesh with the elastic plate of the stop sleeve and prevent the rack from moving in the opposite direction. Since the rack cannot move linearly in the opposite direction, the intermediate gear cannot rotate, thus preventing the drive shaft 62 from rotating in the direction of loosening the fixing belt 50.

[0141] In some other embodiments, the check mechanism can also be a one-way bearing, with the drive shaft rotatably mounted on the base via the one-way bearing. For example, the one-way bearing has an outer ring and an inner ring, the base is fixedly connected to the outer ring of the one-way bearing, and the drive shaft extends into the inner ring of the one-way bearing and is coaxially connected to the one-way bearing. Of course, the rotatable direction of the one-way bearing should be consistent with the rotational direction of the drive shaft along the tensioning belt.

[0142] In some embodiments, the anti-return mechanism 65 further includes an elastic element 653 for applying an elastic force to the pawl 652 so that the pawl 652 remains in contact with the ratchet 651.

[0143] Optionally, the elastic element 653 can be a compression spring, leaf spring, torsion spring, or other structure. For examples, please refer to [link / reference]. Figure 7 and Figure 8 The elastic element 653 includes a compression spring. One end of the compression spring is connected to the base 61, and the other end is connected to the pawl 652. The compression spring applies an elastic tension to the pawl 652, so that the pawl 652 always keeps in contact with the ratchet 651.

[0144] In some other embodiments, the elastic element 653 may also be a similar bow-shaped leaf spring, with one end of the leaf spring fixed to the base 61 and the other end forming a free end. The protruding part of the leaf spring abuts against the pawl 652, and the leaf spring applies elastic pressure to the protruding part so that the pawl 652 always keeps in contact with the ratchet 651.

[0145] In some embodiments, the first end 511 may be connected to the first constraint member 30 by a fastener 53.

[0146] Please refer to Figure 5 And further refer to Figure 10 , Figure 10 for Figure 5 The diagram shows a partial enlarged view of section C. Fastener 53 can use conventional fastening structures such as bolts, self-tapping screws, pins, rivets, and weld studs. For example, the first end 511 is connected to the first constraint member 30 by bolts; that is, both the first end 511 and the first constraint member 30 are provided with mounting holes, and the bolts connect the first end 511 to the first constraint member 30 through these mounting holes.

[0147] Optionally, in order to further improve the stability of the connection between the first end 511 and the first constraint member 30, the first end 511 can be connected to the first constraint member 30 by a plurality of fasteners 53.

[0148] For example, such as Figure 10 As shown, the first end 511 is connected to the first constraint member 30 by four bolts. The four bolts are distributed at intervals along the extension direction perpendicular to the fixing band 50 (i.e., the second direction Y). This connection method makes the fixing band 50 more uniformly stressed in its own width direction (i.e., the second direction Y), and the multiple bolts have stronger shear resistance, ensuring the firmness and stability of the connection between the first end 511 and the first constraint member 30.

[0149] The first end 511 of the fixing strap 50 is connected to the first constraint member 30 by a fastener 53, which facilitates the production and manufacturing of the fixing strap 50 and the first constraint member 30 and the assembly of the battery 100. At the same time, the reliability of the connection between the fixing strap 50 and the first constraint member 30 can be improved by flexibly configuring the type and number of fasteners 53 according to the stress of the fixing strap 50, so as to ensure the stability of the connection between the fixing strap 50 and the first constraint member 30.

[0150] In some embodiments, multiple fixing straps 50 and adjustment devices 60 are provided, and the multiple fixing straps 50 are distributed at intervals along the extension direction perpendicular to the fixing straps 50, with each fixing strap 50 and adjustment device 60 corresponding to the other.

[0151] Specifically, the fixing straps 50 can be two, three, four, five, etc. For example, such as... Figure 5As shown, five fixing straps 50 are provided, and the five fixing straps 50 are evenly distributed on the first constraint member 30 along the extension direction perpendicular to the fixing straps 50 (i.e., the second direction Y).

[0152] Multiple fixing straps 50 and corresponding adjustment devices 60 are arranged along the extension direction perpendicular to the fixing strap 50 to apply multi-point pre-tightening force to the first constraint member 30 and the second constraint member 40, effectively increasing the force coverage range and further improving the suppression effect of the fixing straps 50 and the first constraint member 30 and the second constraint member 40 on the expansion of the battery 100. More importantly, when the battery 100 expands, the force on the first constraint member 30 and the second constraint member 40 at different positions along the extension direction perpendicular to the fixing strap 50 is also different. By setting multiple fixing straps 50 with adjustable pre-tightening force, different pre-tightening forces can be applied to each fixing strap 50 according to different installation positions. This helps to improve the degree of offsetting of the expansion force of the first constraint member 30 and the second constraint member 40 on the battery cell 11, and helps to reduce the deformation of the first constraint member 30 and the second constraint member 40 under force, thereby reducing the deformation of the battery 100 and extending the service life of the battery 100.

[0153] In some embodiments, the first constraint member 30 and the second constraint member 40 are spaced apart along a first direction, and a plurality of battery cells 11 are stacked along the first direction.

[0154] It is understandable that, in order to improve the resistance of the first constraint member 30 and the second constraint member 40 to the expansion force of the battery cell group 11, the first direction can be the collision force direction or the main expansion force direction of the battery cell group 10.

[0155] The first constraint member 30 and the second constraint member 40 are spaced apart along the first direction, and multiple battery cells 11 are stacked and arranged between the first constraint member 30 and the second constraint member 40 along the first direction. This structure makes the force direction of the first constraint member 30 and the second constraint member 40 under the pre-tightening force of the fixing strap 50 the same as the force direction of the expansion force of the multiple battery cells 11 of the battery cell group 10, so as to better ensure the suppression effect of the first constraint member 30, the second constraint member 40 and the fixing strap 50 on the expansion of the battery 100.

[0156] In some embodiments, the battery 100 may include a plurality of battery cell groups 10, which are arranged side by side along a second direction between the first constraint member 30 and the second constraint member 40, and the second direction is perpendicular to the first direction.

[0157] Please refer to this again. Figure 2Each battery cell group 10 includes multiple battery cells 11. That is, multiple rows of battery cells 11 can be arranged between the first constraint member 30 and the second constraint member 40. Each row of battery cells 11 includes multiple battery cells 11. The multiple battery cells 11 in each row are stacked along the first direction, and the multiple rows of battery cells 11 are arranged side by side along the second direction. The first direction is perpendicular to the second direction.

[0158] Multiple battery cell groups 10 are arranged side by side along the second direction between the first constraint member 30 and the second constraint member 40, which is beneficial to improving the energy density of the battery 100.

[0159] In some other embodiments, the battery 100 may further include: a housing 20 and a plurality of beams 23, the plurality of beams 23 being spaced apart within the housing 20 and fixedly connected to the housing 20, with a receiving cavity formed between two adjacent beams 23; wherein, the battery cell group 10 is disposed within the receiving cavity, the first constraint member 30 is one of two adjacent beams, and the second constraint member 40 is the other of two adjacent beams.

[0160] Please refer to Figure 11 , Figure 11 The exploded view of the battery 100 provided in some embodiments of this application shows that the housing 20 may include a first housing 21 and a second housing 22, which are closed together to form a battery cavity. The shapes of the first housing 21 and the second housing 22 can be determined according to the shapes of multiple battery cell groups, and both the first housing 21 and the second housing 22 may have an opening. For example, both the first housing 21 and the second housing 22 may be hollow cuboids with only one open side each. The openings of the first housing 21 and the second housing 22 are opposite to each other, and the first housing 21 and the second housing 22 are interlocked to form a housing 20 with a closed cavity. Multiple battery cells 11 are connected in parallel, series, or mixed and placed inside the housing 20 formed by the interlocking of the first housing 21 and the second housing 22. It is understood that a battery cell group 10 composed of multiple battery cells 11 can be directly placed inside the housing 20, or multiple battery cell groups 10 can be placed inside the housing 20 to form the battery 100.

[0161] It is understandable that two beams 23 can be installed inside the housing 20, and the two beams 23 can be installed at opposite ends inside the housing 20, forming a receiving cavity between the two beams 23. Of course, three, four, five or more beams 23 can also be installed at intervals inside the housing 20, with each pair of adjacent beams 23 forming a receiving cavity. That is, the battery 100 cavity of the housing 20 can be divided into multiple receiving cavities by multiple beams 23.

[0162] The beams 23 of the box body 20 can be integrally formed with the side wall of the box body 20, or they can be set separately and connected to the box body 20 by welding or by fasteners 53 for detachable connection.

[0163] For example, such as Figure 11 As shown, a front beam 231 and a rear beam 232 are fixed inside the housing 20 and are opposite to each other along the length direction of the housing 20. A receiving cavity is formed between the front beam 231 and the rear beam 232. Multiple battery cells 11 of the battery cell group 10 are stacked and arranged in the receiving cavity along the length direction of the housing 20. The first end 511 of the fixing strap 50 is connected to the front beam 231, and the adjusting device 60 is installed on the rear beam 232. That is, the first constraint member 30 is the front beam 231 and the second constraint member 40 is the rear beam 232.

[0164] The housing 20 serves to contain and protect the structure of the battery 100. The beam 23 inside the housing 20 is used to limit and fasten the battery cells 11. The direct installation of the fixing strap 50 and the adjustment device 60 on the beam 23 of the housing 20 can effectively improve the structural integration of the battery 100, thereby increasing the overall energy density of the battery 100. On the other hand, the beam 23 of the housing 20 has strong structural rigidity, good resistance to deformation, and strong load-bearing capacity, which is conducive to further improving the amount of expansion force offset against the battery cells 11 and reducing the amount of deformation of the battery 100.

[0165] In some embodiments, the battery 100 may further include a battery module, the battery module including a battery cell group 10 and two end plates, the two end plates being disposed on opposite sides of the battery cell group 10; wherein, the first constraint member 30 is one of the two end plates and the second constraint member 40 is the other of the two end plates.

[0166] As mentioned earlier, multiple battery cells 11 can be connected in series, parallel, or mixed to directly form a battery 100, or they can first be connected in series, parallel, or mixed to form a battery cell group 10, and then multiple battery cell groups 10 can be connected in series, parallel, or mixed to form a battery 100. In a conventional configuration, the battery 100 may include one or more battery modules, and the battery module includes a battery cell group 10 and two end plates. A limiting cavity is formed between the two end plates to limit the battery cell group 10 within the limiting cavity.

[0167] Optionally, the battery module may also include two side plates (not shown in the figure), two end plates are spaced apart, the two side plates are connected to the two end plates, and the two end plates and the two side plates together form a limiting cavity, and the battery cell group 10 is disposed in the limiting cavity.

[0168] In the battery module, the end plate serves to limit and fasten multiple battery cells 11. In this embodiment, the end plate of the battery module is used to fix the fixing strap 50 and the adjustment device 60, eliminating the need to separately install the first constraint member 30 and the second constraint member 40. This reduces the space occupancy rate of the battery 100, effectively saves implementation costs, and improves the ease of installation of the fixing strap 50 and the adjustment device 60.

[0169] According to some embodiments of this application, this application also provides an electrical device, including the battery 100 described in any of the above embodiments, the battery 100 being used to provide electrical energy to the electrical device.

[0170] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0171] According to some embodiments of this application, see Figures 2 to 11 This application provides a battery 100, which includes a first constraint member 30 and a second constraint member 40 spaced apart, a battery cell group 10, a fixing belt 50, and an adjustment device 60. The battery cell group 10 includes a plurality of battery cells 11, which are stacked between the first constraint member 30 and the second constraint member 40. The fixing belt 50 includes a first end 511 and a second end 521. The first end 511 is fixed to the first constraint member 30 by four bolts, which are spaced apart along the extension direction perpendicular to the fixing belt 50. The second end 521 has a plurality of limiting grooves 522 spaced apart along the extension direction of the fixing belt 50, and the limiting grooves 522 penetrate the fixing belt 50 along the thickness direction of the fixing belt 50.

[0172] The adjusting device 60 is installed on the second constraint member 40. The adjusting device 60 includes a base 61, a drive shaft 62 rotatably mounted on the base 61, a gear 63 and a check mechanism 65. The base 61 is fixed to the second constraint member 40 by bolts, the gear 63 is fixed to the drive shaft 62, and the limiting groove 522 at the second end 521 is used for the teeth of the gear 63 to be inserted.

[0173] The check mechanism 65 includes a ratchet 651, a pawl 652, and a compression spring. The ratchet 651 is coaxially fixed to the drive shaft 62. The pawl 652 is mounted on the base 61 and engages with the ratchet 651. One end of the compression spring is connected to the base 61, and the other end is connected to the pawl 652. The compression spring applies an elastic tension to the pawl 652, so that the pawl 652 always remains in contact with the ratchet 651.

[0174] The second end 521 of the fixing belt 50 is pulled to the drive shaft 62, and the teeth of the gear 63 on the drive shaft 62 are inserted into the limiting groove 522 of the second end 521, so that the fixing belt 50 is connected to the drive shaft 62. The drive shaft 62 is driven to rotate in the direction of tensioning the fixing belt 50 by rotating the drive source. The teeth of the gear 63 are inserted into the limiting groove 522 of the second end 521 in sequence. The second end 521 is gradually wound around the drive shaft 62, and the fixing belt 50 is gradually tightened. After the fixing belt 50 is adjusted to the preset pre-tension, the drive shaft 62 is stopped from rotating. The ratchet 651 and pawl 652 structure restrict the drive shaft 62 from rotating in the direction of loosening the fixing belt 50. After the drive shaft 62 stops rotating, the second end 521 is connected to and wound around the drive shaft 62, and the fixing belt 50 is in a taut state.

[0175] This application also provides a method for manufacturing a battery 100, please refer to... Figure 12 , Figure 12 This is a schematic flowchart of a method for manufacturing a battery 100 provided in some embodiments of this application. The manufacturing method includes:

[0176] S100: Provide a first constraint member 30 and a second constraint member 40, and set the first constraint member 30 and the second constraint member 40 at intervals;

[0177] S200: Provide a battery cell pack 10, which includes a plurality of battery cells 11, and arrange the plurality of battery cells 11 in a stacked arrangement between a first constraint member 30 and a second constraint member 40.

[0178] S300: A fixing strap 50 is provided, the fixing strap 50 includes a first end 511 and a second end 521, and the first end 511 is fixed to the first constraint member 30;

[0179] S400: Provide an adjustment device 60, install the adjustment device 60 on the second constraint member 40, connect the second end 521 to the adjustment device 60, and adjust the pretension of the fixing belt 50 by adjusting the adjustment device 60.

[0180] It should be noted that the relevant structure of the battery 100 manufactured by the manufacturing method provided in the above embodiments can be found in the battery 100 provided in the foregoing embodiments, and will not be repeated here.

[0181] This application also provides a manufacturing apparatus 2000 for a battery 100, please refer to... Figure 13 , Figure 13 This is a schematic block diagram of a battery 100 manufacturing apparatus 2000 provided in some embodiments of this application. The manufacturing apparatus 2000 includes a supply module and an assembly module. The supply module may include a first supply device 2100, a second supply device 2200, a third supply device 2300, and a fourth supply device 2400. The assembly module may include a first assembly device 2500, a second assembly device 2600, and a third assembly device 2700.

[0182] A first providing device 2100 provides a first constraint member 30 and a second constraint member 40, which are spaced apart. A second providing device 2200 provides a battery cell 11. A third providing device 2300 provides a fixing strap 50, and a fourth providing device 2400 provides an adjusting device 60. The fixing strap 50 includes a first end 511 and a second end 521. A first assembly device 2500 stacks multiple battery cells 11 between the first constraint member 30 and the second constraint member 40. A second assembly device 2600 fixes the first end 511 to the first constraint member 30 and installs the adjusting device 60 onto the second constraint member 40. A third assembly device 2700 connects the second end 521 to the adjusting device 60, and adjusts the preload of the fixing strap 50 via the adjusting device 60.

[0183] It should be noted that the relevant structure of the battery 100 manufactured by the manufacturing equipment 2000 provided in the above embodiments can be found in the battery 100 provided in the foregoing embodiments, and will not be repeated here.

[0184] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0185] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising: The first and second constraint members are spaced apart; A battery cell assembly includes multiple battery cells, which are stacked and arranged between the first constraint member and the second constraint member. The fixing strap includes a first end and a second end, wherein the first end is fixed to the first constraint member; as well as An adjustment device is installed on the second constraint member, the adjustment device being used to connect to the second end and adjust the preload of the fixing strap; The adjusting device includes a base and a drive shaft. The base is fixed to the second constraint member, and the drive shaft is rotatably mounted on the base. The drive shaft is configured to connect to the second end and adjust the preload of the fixing belt by rotation. The adjusting device also includes a gear fixed to the drive shaft. The second end is configured to mesh with the gear. The second end is provided with a plurality of limiting grooves, which are spaced apart along the extension direction of the fixing belt. The limiting grooves are used for the teeth of the gear to be inserted. The limiting grooves penetrate the fixing belt along the thickness direction. The fixing belt includes a fixed length section and an adjusting section. One end of the fixed length section is fixed to the first constraint member, and the other end is connected to the adjusting section. The limiting grooves are provided in the adjusting section.

2. The battery according to claim 1, wherein, The drive shaft includes: Drive shaft body; A limiting flange is formed on the drive shaft body and protrudes from the outer peripheral surface of the drive shaft body. The limiting flange is used to restrict the axial movement of the fixing belt along the drive shaft.

3. The battery according to any one of claims 1 and 2, wherein, An operating part is provided at one end of the drive shaft, and the operating part is used to connect to a rotation drive source.

4. The battery according to any one of claims 1 to 3, wherein, The regulating device further includes: A check mechanism is configured to allow the drive shaft to rotate in the direction of tensioning the fixed belt and to restrict the drive shaft from rotating in the direction of loosening the fixed belt.

5. The battery according to claim 4, wherein, The anti-return mechanism includes: A ratchet is fixed to the drive shaft, and the central axis of the ratchet coincides with the central axis of the drive shaft; A pawl is mounted on the base, the pawl engages with the ratchet, and the pawl is configured to allow the ratchet to rotate in one direction.

6. The battery according to claim 5, wherein, The check mechanism also includes: An elastic element is provided to apply an elastic force to the pawl so that the pawl remains in contact with the ratchet.

7. The battery according to any one of claims 1 to 6, wherein, The first end is connected to the first constraint member by a fastener.

8. The battery according to any one of claims 1 to 7, wherein, Multiple fixing straps and multiple adjusting devices are provided. The multiple fixing straps are distributed at intervals along the extension direction perpendicular to the fixing straps, and the fixing straps and the adjusting devices correspond one-to-one.

9. The battery according to any one of claims 1 to 8, wherein, The first constraint member and the second constraint member are spaced apart along a first direction, and the plurality of battery cells are stacked along the first direction.

10. The battery according to claim 9, wherein, The battery includes multiple battery cell groups, which are arranged side by side along a second direction between the first constraint member and the second constraint member, and the second direction is perpendicular to the first direction.

11. The battery according to any one of claims 1 to 10, wherein, The battery also includes: Box; Multiple beams are spaced apart within the box and fixedly connected to the box, with a receiving cavity formed between two adjacent beams; The battery cell assembly is disposed within the receiving cavity, the first constraint member is one of the two adjacent beams, and the second constraint member is the other of the two adjacent beams.

12. The battery according to any one of claims 1 to 10, wherein, The battery also includes: A battery module, the battery module comprising the battery cell group and two end plates, the two end plates being disposed on opposite sides of the battery cell group; The first constraint member is one of the two end plates, and the second constraint member is the other of the two end plates.

13. An electrical device comprising a battery as described in any one of claims 1-12, the battery being used to provide electrical energy.

14. A method for manufacturing a battery, comprising: A first constraint member and a second constraint member are provided, and the first constraint member and the second constraint member are spaced apart. A battery cell assembly is provided, the battery cell assembly comprising a plurality of battery cells, wherein the plurality of battery cells are stacked and arranged between the first constraint member and the second constraint member; A fixing strap is provided, the fixing strap including a first end and a second end, the first end being fixed to the first constraint member; An adjustment device is provided, which is installed on the second constraint member and the second end is connected to the adjustment device. The pretension force of the fixing belt is adjusted by the adjustment device. The adjustment device includes a base and a drive shaft. The base is fixed to the second constraint member, and the drive shaft is rotatably installed on the base. The drive shaft is configured to connect to the second end and adjust the pretension force of the fixing belt by rotation. The adjustment device also includes a gear, which is fixed to the drive shaft. The second end is configured to mesh with the gear. The second end is provided with a plurality of limiting grooves, which are spaced apart along the extension direction of the fixing belt. The limiting grooves are used for the teeth of the gear to be inserted. The limiting grooves penetrate the fixing belt along the thickness direction of the fixing belt. The fixing belt includes a fixed length section and an adjustment section. One end of the fixed length section is fixed to the first constraint member, and the other end is connected to the adjustment section. The limiting grooves are provided in the adjustment section.

15. A battery manufacturing apparatus, comprising: A module is provided for providing a first constraint member and a second constraint member, providing a battery cell assembly, providing a fixing strap, and providing an adjustment device. The first constraint member and the second constraint member are spaced apart. The battery cell assembly includes a plurality of battery cells. The fixing strap includes a first end and a second end. An assembly module is used to stack multiple battery cells between a first constraint member and a second constraint member, fix the first end to the first constraint member, install the adjustment device on the second constraint member, connect the second end to the adjustment device, and adjust the pretension of the fixing belt through the adjustment device. The adjustment device includes a base and a drive shaft. The base is fixed to the second constraint member, and the drive shaft is rotatably mounted on the base. The drive shaft is configured to connect to the second end and adjust the pretension of the fixing belt by rotation. The adjustment device also includes a gear, which is fixed to the drive shaft. The second end is configured to mesh with the gear. The second end is provided with multiple limiting grooves, which are spaced apart along the extension direction of the fixing belt. The limiting grooves are used for the insertion of the gear teeth and extend through the fixing belt along the thickness direction. The fixing belt includes a fixed length section and an adjustment section. One end of the fixed length section is fixed to the first constraint member, and the other end is connected to the adjustment section. The limiting grooves are provided in the adjustment section.

Images