Pressurizing device, battery pack preparation method, battery pack, and electric device

Abstract

The application relates to the technical field of batteries, and provides a pressing device and a battery pack preparation method. The pressing device comprises a first pressing assembly, a second pressing assembly and a driving assembly. The first pressing assembly and the second pressing assembly can be arranged at opposite sides of a battery cell unit, so that the first pressing assembly and the second pressing assembly can clamp the battery cell unit. The driving assembly drives the first pressing assembly and the second pressing assembly to move towards each other, so that the first pressing assembly and the second pressing assembly can simultaneously exert first pressure and second pressure towards opposite sides of the battery cell unit, so that the battery cell unit is more fully stressed, and the pressing device can provide greater restraint force for the battery cell unit. The battery pack preparation method provided by the application can make the battery cell unit more conveniently installed in a tray and the restraint force of the tray acting on the battery cell unit greater after the battery cell unit is provided with sufficient restraint force by the above pressing device.

Description

Technical Field

[0001] This application relates to a pressurization device, a battery pack preparation method, a battery pack, and an electrical device, belonging to the field of battery technology. Background Technology

[0002] Solid-state batteries generate enormous expansion forces during operation, which can reach the megapascal level. In order for solid-state batteries to work stably during charging and discharging, huge restraining forces need to be applied to the solid-state batteries to fix them and prevent them from expanding excessively.

[0003] Currently, some solid-state battery modules use trays to restrain the solid-state batteries, applying a restraining force through the inner wall of the tray. This requires pressurizing the solid-state battery before installation to ensure it conforms to the tray's inner wall. However, current pressurization devices struggle to increase the pressure applied to the solid-state battery. Summary of the Invention

[0004] This application provides a pressurizing device, a battery pack manufacturing method, a battery pack, and an electrical device to solve the problem of poor pressurization effect of pressurizing devices on batteries in related technologies.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a pressurizing device for pressurizing a battery cell unit, the pressurizing device comprising:

[0007] First pressurization component;

[0008] The second pressurizing component is disposed opposite to the first pressurizing component.

[0009] A drive assembly is connected to the first pressurizing assembly and the second pressurizing assembly, the first pressurizing assembly and the second pressurizing assembly being configured to be detachably pressed onto opposite sides of the cell unit, and the drive assembly being configured to drive the first pressurizing assembly and the second pressurizing assembly to move toward each other to generate a first pressure and a second pressure acting on the cell unit, the first pressure and the second pressure being in opposite directions.

[0010] In some embodiments, the first pressurizing component forms a first orthographic projection on the surface of the cell unit, and the first orthographic projection covers the cell unit;

[0011] The second pressurizing component forms a second orthographic projection on the surface of the cell unit, and the second orthographic projection covers the cell unit.

[0012] In some embodiments, the drive assembly is disposed between the first pressurizing assembly and the second pressurizing assembly, and the direction of the drive assembly to the cell unit is a second direction, which intersects with the first direction, and the first direction is parallel to the directions of the first pressure and the second pressure.

[0013] In some embodiments, the pressurizing device further includes a first end plate and a second end plate, the first end plate and the second end plate being stacked on opposite sides of the battery cell, the first pressurizing component being detachably connected to the first end plate, and the second pressurizing component being detachably connected to the second end plate.

[0014] In some embodiments, the first pressurizing assembly includes a first pressurizing member and a first connecting rod, the first connecting rod being movably inserted through the first end plate along the second direction, the first connecting rod being connected to the first pressurizing member, and the first pressurizing member being connected to the driving assembly;

[0015] The second pressurizing component includes a second pressurizing member and a second connecting rod. The second connecting rod is movably inserted through the second end plate along the second direction. The second connecting rod is connected to the second pressurizing member, and the second pressurizing member is connected to the driving component.

[0016] The drive assembly drives the first pressurizing element and the second pressurizing element to move toward each other.

[0017] In some embodiments, there are two of each of the first and second pressure members. The two first pressure members are respectively connected to the two ends of the first connecting rod in the second direction, and the two second pressure members are respectively connected to the two ends of the second connecting rod in the second direction.

[0018] The drive assembly is connected to the two first pressurizing elements, and the drive assembly is configured to drive the two first pressurizing elements to move toward the second pressurizing assembly;

[0019] The drive assembly is also connected to two second pressurizing elements, and the drive assembly is configured to drive the two second pressurizing elements to move toward the first pressurizing assembly.

[0020] In some embodiments, the first connecting rod is detachably connected to the first pressure member, and the second connecting rod is detachably connected to the second pressure member.

[0021] In some embodiments, the first connecting rod is threadedly connected to the first pressure member, and / or

[0022] The second connecting rod is threadedly connected to the second pressure component.

[0023] In some embodiments, the two first pressurizing members are located at both ends of the cell unit in the second direction, and the two second pressurizing members are located at both ends of the cell unit in the second direction.

[0024] In some embodiments, the number of the driving components is multiple;

[0025] The first pressure member and the second pressure member, located at one end of the cell unit in the second direction, are connected to at least one of the drive components;

[0026] And / or,

[0027] The first and second pressurizing members, located at the other end of the cell unit in the second direction, are connected to at least one of the drive components.

[0028] In some embodiments, the drive assembly includes a screw, a nut, and a hydraulic tensioner. The screw passes through the first pressurizing assembly and the second pressurizing assembly. The nut is connected to one end of the screw, and the hydraulic tensioner is connected to the other end of the screw. The nut and the hydraulic tensioner abut against opposite sides of the first pressurizing assembly and the second pressurizing assembly, respectively.

[0029] In some embodiments, the first pressure member includes a first connecting plate and a first mounting plate, one end of the first connecting plate is connected to the first mounting plate at an angle, and the end of the first connecting plate away from the first mounting plate is detachably connected to the first connecting rod.

[0030] The second pressure component includes a second connecting plate and a second mounting plate. One end of the second connecting plate is connected to the second mounting plate at an angle, and the end of the second connecting plate away from the second mounting plate is detachably connected to the second connecting rod.

[0031] The drive component is connected to the first mounting plate and the second mounting plate.

[0032] In some embodiments, the first pressure member further includes a first reinforcing rib, the first reinforcing rib being connected to the first connecting plate and the first mounting plate; and / or,

[0033] The second pressure component also includes a second reinforcing rib, which is connected to the second connecting plate and the second mounting plate.

[0034] In some embodiments, there are multiple first reinforcing ribs, which are spaced apart to create a first mounting cavity between adjacent first reinforcing ribs.

[0035] The number of the second reinforcing ribs is multiple, and the multiple second reinforcing ribs are spaced apart so that there is a second mounting cavity between adjacent second reinforcing ribs;

[0036] The drive assembly is disposed within the first mounting cavity and the second mounting cavity.

[0037] Secondly, this application also provides a method for preparing a battery pack, comprising:

[0038] A battery cell unit is provided, the battery cell unit comprising a plurality of battery cells stacked along a first direction;

[0039] The pressure device described above applies a first pressure and a second pressure to the opposite sides of the battery cell in the first direction.

[0040] The battery cell unit is installed in the tray;

[0041] Disconnect the pressurizing device from the battery cell unit.

[0042] In some embodiments, the pressurizing device further includes a first end plate and a second end plate;

[0043] The first end plate and the second end plate are stacked on opposite sides of the cell unit in the first direction, and the first end plate and the second end plate respectively abut against the inner wall of the tray. The first pressure assembly is detachably connected to the first end plate, and the second pressure assembly is detachably connected to the second end plate.

[0044] The step of disassembling the pressurizing device from the battery cell unit includes:

[0045] Disconnect the first pressurizing component from the first end plate, and disconnect the second pressurizing component from the second end plate.

[0046] Thirdly, based on the battery pack preparation method described above, this application also provides a battery pack prepared by the battery pack preparation method described above.

[0047] Fourthly, based on the battery pack described above, this application also provides an electrical device including the battery pack described above.

[0048] The pressurizing device provided in this application can be used to pressurize a battery cell. A first pressurizing component and a second pressurizing component can be disposed on opposite sides of the battery cell, allowing the first and second pressurizing components to clamp the battery cell. A driving component drives the first and second pressurizing components to move towards each other, enabling the first and second pressurizing components to simultaneously apply opposing first and second pressures to opposite sides of the battery cell. This results in more sufficient force on the battery cell, and the pressurizing device can provide greater restraint force to the battery cell.

[0049] The battery pack manufacturing method provided in this application involves installing the battery cells into the tray after the aforementioned pressurizing device provides sufficient restraint force. This allows for easier installation of the battery cells into the tray, and the tray exerts a greater restraint force on the battery cells. Consequently, the battery pack manufactured by this method has a more stable structure and is more safe and reliable in operation.

[0050] The battery pack proposed in this application is manufactured by a battery pack preparation method. By retaining the first end plate and the second end plate on both sides of the cell unit, the pressure device and the cell unit are easy to assemble and disassemble. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A schematic diagram of the pressurization device provided in the embodiments of this application;

[0053] Figure 2 This is a three-dimensional structural diagram of the pressurization device provided in the embodiments of this application;

[0054] Figure 3 A schematic diagram of the drive assembly of the pressurization device provided in the embodiments of this application;

[0055] Figure 4 This is a schematic diagram of a battery pack provided in an embodiment of this application.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10 - Pressurization device; 20 - Battery pack;

[0058] 100 - First pressurizing assembly; 110 - First pressurizing component; 111 - First connecting plate; 112 - First mounting plate; 113 - First reinforcing rib; 114 - First mounting cavity; 120 - First connecting rod; 130 - First end plate;

[0059] 200 - Second pressurizing assembly; 210 - Second pressurizing component; 211 - Second connecting plate; 212 - Second mounting plate; 213 - Second reinforcing rib; 214 - Second mounting cavity; 220 - Second connecting rod; 230 - Second end plate;

[0060] 300 - Drive assembly; 311 - Screw; 312 - Nut; 313 - Hydraulic tensioner;

[0061] 400 - Battery cell unit; 410 - Battery cell;

[0062] 500-pallet. Detailed Implementation

[0063] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0064] Solid-state batteries generate enormous expansion forces during operation, which can reach the megapascal level. In order for solid-state batteries to work stably during charging and discharging, huge restraining forces need to be applied to the solid-state batteries to fix them and prevent them from expanding excessively.

[0065] Currently, some solid-state battery modules use trays to restrain the solid-state batteries, applying a restraining force through the inner wall of the tray. This requires pressurizing the solid-state battery before installation to ensure it conforms to the tray's inner wall. However, current pressurization devices struggle to increase the pressure applied to the solid-state battery.

[0066] The pressurizing device proposed in this application can be used to pressurize a battery cell. A first pressurizing component and a second pressurizing component can be disposed on opposite sides of the battery cell, allowing the first and second pressurizing components to clamp the battery cell. A driving component drives the first and second pressurizing components to move towards each other, enabling the first and second pressurizing components to simultaneously apply opposing first and second pressures to opposite sides of the battery cell. This results in more sufficient force on the battery cell, and the pressurizing device can provide greater restraint force to the battery cell.

[0067] The battery pack manufacturing method proposed in this application involves installing the battery cells into the tray after the aforementioned pressurizing device provides sufficient restraint force. This allows for easier installation of the battery cells into the tray, and the tray exerts a greater restraint force on the battery cells. Consequently, the battery pack manufactured by this method has a more stable structure and is safer and more reliable in operation.

[0068] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0069] This application discloses a pressurizing device 10, with reference to... Figure 1 As shown, it includes a first pressurizing component 100, a second pressurizing component 200, and a driving component 300. This pressurizing device can be used to pressurize a battery cell unit 400, wherein the battery cell unit 400 may include a single battery cell 410 or multiple battery cells 410, and the multiple battery cells 410 are stacked along the thickness direction of the battery cells 410, thereby generating a restraining force acting on the battery cell unit 400.

[0070] The first pressurizing component 100 and the second pressurizing component 200 are disposed opposite to each other, and the first pressurizing component 100 and the second pressurizing component 200 are movable relative to each other, so that the distance between the first pressurizing component 100 and the second pressurizing component 200 can be adjusted. The first pressurizing component 100 and the second pressurizing component 200 are detachably disposed on opposite sides of the cell unit 400, so that the first pressurizing component 100 and the second pressurizing component 200 can press against opposite sides of the cell unit 400, thereby clamping the cell unit 400.

[0071] The drive assembly 300 is connected to both the first pressurizing assembly 100 and the second pressurizing assembly 200, and can drive the first pressurizing assembly 100 and the second pressurizing assembly 200 to move towards each other. In this way, the first pressurizing assembly 100 generates a first pressure acting on one side of the battery cell 400, and the second pressurizing assembly 200 generates a second pressure acting on the other side of the battery cell 400, with the first and second pressures acting in opposite directions. This ensures that both opposite sides of the battery cell 400 are subjected to pressure, and the pressurizing assembly of this application exerts a greater restraining force on the battery cell 400. Therefore, even if the expansion force of the battery cell 400 is large, the pressurizing device can still ensure the interface requirements of the battery cell 400.

[0072] When the pressurizing component of this application applies pressure to the cell unit 400, the cell unit 400 includes multiple cell units 400, which can be stacked along a first direction, namely the X direction in the figure. This allows the multiple cell units 400 to be arranged more centrally, resulting in a more compact structure. The multiple cell units 400 also increase the capacitance of the cell unit 400.

[0073] The first pressurizing component 100 and the second pressurizing component 200 are detachably disposed on opposite sides of the cell unit 400 in the first direction, so that the first pressurizing component 100 and the second pressurizing component 200 can be pressed on opposite sides of the cell unit 400, thereby enabling the first pressurizing component 100 and the second pressurizing component 200 to clamp the cell unit 400.

[0074] Furthermore, it should be understood that after the cell unit 400 is constrained by the pressurizing device of this application, it needs to be installed in the tray of the battery pack housing to form the battery pack. Specifically, the tray has a battery cavity, and when the cell unit 400 is placed in the battery cavity, the inner wall of the battery cavity can press against the cell unit 400. The constraining force provided by the pressurizing device of this application can further compress the cell unit 400 in the stacking direction of the cell units 400, thereby further reducing the size of the cell unit 400 in the stacking direction. In this way, the cell unit 400 can be installed in a smaller battery cavity, and correspondingly, the inner wall of the battery cavity exerts a greater constraining force on the cell unit 400 to ensure the safety and reliability of the battery pack.

[0075] After the cell unit 400 is installed in the battery cavity of the tray, the first pressurizing component 100 and the second pressurizing component 200 can be detached from the cell unit 400. In this way, the restraining force acting on the cell unit 400 is provided only by the tray, and the battery pack does not need to be provided with other restraining structures to provide restraining force to the cell unit 400, which makes the structure of the battery pack simpler and lighter.

[0076] In some implementations, reference Figure 1 As shown, the first direction can be set to the thickness direction of the cell unit 400, wherein the thickness direction of the cell unit 400 is... Figure 1 In the X direction, the cell unit 400 also has a length direction and a width direction. Multiple cell units 400 can also be electrically connected, specifically in series, thus increasing the charge capacity of the cell unit 400. It should be understood that the cell unit 400 can have a structure similar to a thin plate, making its length and width dimensions larger than its thickness. The ratio of the length, width, and thickness of the cell unit 400 formed by stacking multiple cell units 400 along its thickness direction is smaller. This avoids the cell unit 400 being too large in a single direction, effectively reducing the ratio of its length, width, and thickness, thus making the structure of the cell unit 400 more compact.

[0077] It should be understood that among the various surfaces of the battery cell 400, the surface facing the same direction as the first direction is the large surface of the battery cell 400, and the area of ​​the large surface of the battery cell 400 is relatively larger than the area of ​​the other side surfaces of the battery cell 400. During the charging and discharging process, the expansion force of the battery cell 400 is mainly along the first direction, making the expansion tendency of the large surface the greatest. That is, the expansion of the battery cell 400 is mainly manifested in the expansion of the large surfaces on opposite sides of the battery cell 400 in opposite directions. Correspondingly, the overall expansion trend of the battery cell 400 is mainly formed along the positive and negative directions of the first direction.

[0078] In this application, the preload force generated by the first pressurizing component 100 and the second pressurizing component 200 on the cell unit 400 is parallel to the first direction, so that the preload force of the first pressurizing component 100 and the second pressurizing component 200 on the cell unit 400 can suppress the tendency of the cell unit 400 to expand in both directions along the first direction, thereby suppressing the main expansion trend of the cell unit 400, so that the cell unit 400 can have better structural stability in the first direction.

[0079] In some implementations, reference Figure 1 As shown, in this application, the first pressurizing component 100 can form a first orthographic projection on the surface of the battery cell 400 in the direction toward the battery cell 400. The first orthographic projection covers the surface of the battery cell 400, such that the surface of the battery cell 400 lies within the first orthographic projection. This allows the first pressurizing component 100 to make sufficient contact with the surface of the battery cell 400, ensuring that the first pressure generated by the first pressurizing component 100 can effectively act on the battery cell 400. Furthermore, it saves on the material used for the first pressurizing component 100, thereby reducing the manufacturing cost of the pressurizing device in this application.

[0080] Specifically, the first orthographic projection can cover the battery cell 400, so that each part of the end face of the battery cell 400 in the first direction can be fully stressed, preventing damage to the end face of the battery cell 400 due to uneven stress.

[0081] The second pressurizing component 200 can form a second orthographic projection on the surface of the battery cell 400 in the direction toward the battery cell 400. The second orthographic projection covers the surface of the battery cell 400 of this application, so that the second pressurizing component 200 can make full contact with the surface of the battery cell 400, and the second pressure generated by the second pressurizing component 200 can be fully applied to the battery cell 400.

[0082] In some implementations, reference Figures 1 to 2As shown, the driving component 300 of this application can be disposed between the first pressurizing component 100 and the second pressurizing component 200, and the direction from the driving component 300 to the cell unit 400 or the cell unit 400 is a second direction, which intersects with the first direction. By disposing the driving component 300 between the first pressurizing component 100 and the second pressurizing component 200, the pressurizing device of this application has a more compact structure and occupies less space.

[0083] By making the direction from the drive assembly 300 to the cell unit 400 the second direction, the drive assembly 300 can be installed on the cell unit 400 without taking up additional space in the first direction, which makes it easier to install the cell unit 400 in the battery cavity of the tray.

[0084] In some implementations, reference Figures 1 to 2 As shown, the pressurizing device 10 of this application may further include a first end plate 130 and / or a second end plate 230. Specifically, the battery cell unit 400 may include a first end plate 130 and a second end plate 230, which are stacked along a first direction on the battery cell unit 400. The first end plate 130 and the second end plate 230 are located on opposite sides of the two outermost battery cell units 400 among the plurality of battery cell units 400. The first end plate 130 and the second end plate 230 can clamp the plurality of battery cell units 400, thus preventing the ends of the battery cell units 400 from being exposed in the first direction, and serving the purpose of protecting and limiting the battery cell units 400.

[0085] If the first pressurizing assembly 100 and the second pressurizing assembly 200 are directly pressed onto the end of the battery cell 400 along the first direction, the battery cell 400 may be damaged. Therefore, the first pressurizing assembly 100 is detachably connected to the first end plate 130. The first end plate 130 can separate the first pressurizing assembly 100 from the end of the battery cell 400 along the first direction, preventing the first pressurizing assembly 100 from being directly pressed onto the end of the battery cell 400 along the first direction, thus avoiding damage to the battery cell 400. The second pressurizing assembly 200 is detachably connected to...

[0086] On the second end plate 230, the second plate can separate the second pressurizing component 200 from the other end of the cell unit 400 along the first direction, so as to prevent the second pressurizing component 200 from being directly pressed onto the other end of the cell unit 400 along the first direction, thereby avoiding damage to the cell unit 400.

[0087] After the cell unit 400 is installed in the battery cavity of the tray, the first pressurizing assembly 100 and the first end plate 130 can be disassembled, and the second pressurizing assembly 200 and the second end plate 230 can be disassembled, so that the pressurizing device of this application can be fully used.

[0088] In some implementations, reference Figure 2 As shown, the first pressurizing assembly 100 of this application includes a first connecting rod 120 and a first pressurizing member 110. The first connecting rod 120 is movably inserted through the first end plate 130 in a second direction, so that the first connecting rod 120 and the first end plate 130 are detachably connected. The first connecting rod 120 is connected to the first pressurizing member 110, and the first pressurizing member 110 is connected to the driving assembly 300. The driving assembly 300 drives the first pressurizing member 110 to move, which can drive the first connecting rod 120 to move, thereby driving the first end plate 130 to move toward the cell unit 400, so as to provide a restraining force to the cell unit 400.

[0089] Specifically, the first end plate 130 has an opening extending in the second direction for the first connecting rod 120 to pass through. By passing the first connecting rod 120 through the opening of the first end plate 130, the contact area between the first connecting rod 120 and the first end plate 130 can be increased, thereby enabling the first connecting rod 120 to more fully drive the first end plate 130 to move toward the cell unit 400.

[0090] Furthermore, by having the first connecting rod 120 pass through the first end plate 130, the first connecting rod 120 can prevent the first end plate 130 from obstructing the side facing away from the cell unit 400. In this way, when the cell unit 400 is placed in the battery cavity of the tray, the side of the first end plate 130 facing away from the cell unit 400 can directly contact and support the inner wall of the battery cavity.

[0091] The second pressurizing assembly 200 includes a second pressurizing member 210 and a second connecting rod 220. The second connecting rod 220 is movably inserted through the second end plate 230 along a second direction, making the second connecting rod 220 detachably connected to the second end plate 230. The second connecting rod 220 is connected to the second pressurizing member 210, and the second pressurizing member 210 is connected to the driving assembly 300. The driving assembly 300 drives the second pressurizing member 210 to move, which in turn drives the second connecting rod 220 to move, thereby causing the second end plate 230 to move toward the cell unit 400, so as to provide a restraining force to the cell unit 400.

[0092] Specifically, the second end plate 230 has an opening extending in the second direction for the second connecting rod 220 to pass through. By passing the second connecting rod 220 through the opening of the second end plate 230, the contact area between the second connecting rod 220 and the second end plate 230 can be increased, thereby enabling the second connecting rod 220 to more fully drive the second end plate 230 to move toward the cell unit 400.

[0093] Furthermore, by having the second connecting rod 220 pass through the second end plate 230, the second connecting rod 220 can prevent the second end plate 230 from obstructing the side facing away from the cell unit 400. In this way, when the cell unit 400 is placed in the battery cavity of the tray, the side of the second end plate 230 facing away from the cell unit 400 can directly contact and support the inner wall of the battery cavity.

[0094] In some implementations, reference Figures 1 to 2 As shown, the number of first pressure members 110 in this application can be set to two, and the two first pressure members 110 are respectively connected to the two ends of the first connecting rod 120 in the second direction. The driving assembly 300 can drive the two first pressure members 110 to move simultaneously, so that the two ends of the first connecting rod 120 in the second direction can be subjected to force and move simultaneously. In this way, the second connecting rod 220 is subjected to balanced force, avoiding the second connecting rod 220 from deflecting during movement, thereby making the first pressure exerted by the second connecting rod 220 on the first end plate 130 more sufficient.

[0095] The number of second pressure members 210 in this application can be set to two, and the two second pressure members 210 are respectively connected to the two ends of the second connecting rod 220 in the second direction. The driving assembly 300 can drive the two second pressure members 210 to move simultaneously, so that the two ends of the second connecting rod 220 in the second direction can be subjected to force and move simultaneously. In this way, the second connecting rod 220 is subjected to balanced force, avoiding the second connecting rod 220 from deflecting during movement, thereby making the second pressure exerted by the second connecting rod 220 on the second end plate 230 more sufficient.

[0096] In some implementations, reference Figures 1 to 2 As shown, two first pressurizing members 110 can be disposed at both ends of the cell unit 400 in the second direction, and two second pressurizing members 210 can be disposed at both ends of the cell unit 400 in the second direction. The number of drive assemblies 300 can be multiple, with the first pressurizing member 110 and the second pressurizing member 210 located at one end of the cell unit 400 in the second direction connected to one drive assembly 300. The first pressurizing member 110 and the second pressurizing member 210 located at the other end of the cell unit 400 in the second direction are connected to another drive assembly 300.

[0097] In this way, the two drive components 300 can drive the corresponding first pressure member 110 and second pressure member 210 to move towards each other, thereby making the force on the first connecting rod 120 and the second connecting rod 220 more balanced.

[0098] In some implementations, reference Figure 3As shown, the drive assembly 300 in this application can be a hydraulic bolt tensioner. Accordingly, the drive assembly 300 passes through the first pressure member 110 and the second pressure member 210 and is then installed on the first pressure member 110 and the second pressure member 210. Specifically, the drive assembly 300 includes a screw 311, a nut 312, and a hydraulic tensioner 313. The screw 311 passes through the first pressure member 110 and the second pressure member 210, the nut is connected to one end of the screw 311, and the hydraulic tensioner 313 is connected to the other end of the screw 311.

[0099] The hydraulic bolt tensioner can provide a relatively larger driving force, thereby increasing the first pressure exerted by the drive assembly 300 on the first pressurizing assembly 100 on the cell unit 400, and also increasing the second pressure exerted by the drive assembly 300 on the second pressurizing assembly 200 on the cell unit 400. This results in a greater restraining force exerted on the cell unit 400 by the pressurizing device of this application, and consequently, the cell unit 400 can be more easily installed into the battery cavity of the tray.

[0100] In addition, the hydraulic bolt tensioner has the advantage of a compact structure, which makes the overall structure of the pressurizing device of this application more compact and occupies less space.

[0101] In some implementations, reference Figure 2 As shown, the first pressure member 110 of this application may be configured to include a first connecting plate 111 and a first mounting plate 112. One end of the first connecting plate 111 is connected to the first mounting plate 112 at an angle, and the end of the first connecting plate 111 away from the first mounting plate 112 is detachably connected to the first connecting rod 120. The second pressure member 210 may be configured to include a second connecting plate 211 and a second mounting plate 212. One end of the second connecting plate 211 is connected to the second mounting plate 212 at an angle, and the end of the second connecting plate 211 away from the second mounting plate 212 is detachably connected to the second connecting rod 220. The driving assembly 300 may be connected to the first mounting plate 112 and the second mounting plate 212, and the driving assembly 300 may drive the first mounting plate 112 and the second mounting plate 212 to move towards each other, thereby causing the first pressure member 100 and the second pressure member 200 to move towards each other as a whole.

[0102] In some implementations, reference Figure 2 As shown, the first pressure member 110 of this application may also be provided with a first reinforcing rib 113. The first reinforcing rib 113 is connected to the first connecting plate 111 and the first mounting plate 112. The first reinforcing rib 113 can support the first connecting plate 111 and the first mounting plate 112, and prevent the first pressure member 110 from deforming when the drive assembly 300 drives the first pressure member 110 to move, which would cause the battery cell 400 to deform due to uneven force. This can protect the battery cell 400.

[0103] The second pressure member 210 of this application may also be provided with a second reinforcing rib 213. The second reinforcing rib 213 is connected to the second connecting plate 211 and the second mounting plate 212. The second reinforcing rib 213 can support the second connecting plate 211 and the second mounting plate 212, and prevent the second pressure member 210 from deforming when the drive assembly 300 drives the second pressure member 210 to move, which would cause the battery cell 400 to deform due to uneven force. This can protect the battery cell 400.

[0104] In some implementations, reference Figure 2 As shown, there are multiple first reinforcing ribs 113, which are spaced apart to create a first mounting cavity 114 between adjacent first reinforcing ribs 113. Specifically, the multiple first reinforcing ribs 113 are spaced apart along a third direction, which is perpendicular to both the first and second directions.

[0105] The number of second reinforcing ribs 213 is multiple, and the multiple second reinforcing ribs 213 are arranged at intervals so that there is a second mounting cavity 214 between adjacent second reinforcing ribs 213. Specifically, the multiple second reinforcing ribs 213 are arranged at intervals along a third direction, and the third direction is perpendicular to both the first direction and the second direction.

[0106] Multiple first mounting cavities 114 and multiple second mounting cavities 214 are provided. Among the multiple drive components 300, a portion of any drive component 300 can be disposed within a first mounting cavity 114, and another portion of the drive component 300 can be disposed within a corresponding second mounting cavity 214. Thus, the multiple drive components 300 can be distributed and disposed within the multiple first mounting cavities 114 and multiple second mounting cavities 214.

[0107] Secondly, this application also proposes a method for preparing a battery pack, referring to... Figure 4 As shown, it includes:

[0108] S100 provides a cell unit, which includes a plurality of cells stacked along a first direction.

[0109] S200 applies a first pressure and a second pressure to the opposite sides of the cell unit in a first direction via a pressurizing device.

[0110] The pressurizing device is the pressurizing device of this application, which allows the battery cell to be fully stressed on both opposite sides in the first direction, and the restraining force exerted by the pressurizing device on the battery cell is greater.

[0111] S300, the cell unit is placed in the battery cavity of the tray, and the cell unit abuts against the inner wall of the battery cavity on opposite sides in the first direction.

[0112] The inner wall of the tray 500 can provide a restraining force on the cell unit 400, so that the cell unit 400 can maintain structural stability.

[0113] The S400 separates the pressurizing device from the battery cell unit, allowing the pressurizing device to be reused.

[0114] In some embodiments, the preparation method of this application further includes:

[0115] S410, the first pressure member is disassembled from the first end plate, and the second pressure member is disassembled from the second end plate.

[0116] In this way, the first end plate 130 and the second end plate 230 can be retained in the tray 500, making it easier to disassemble the pressurizing device and the cell unit 400.

[0117] This application also proposes a battery pack 20, which is prepared by the battery pack preparation method described above.

[0118] This application also proposes an electrical device that includes the battery pack 20 described above.

[0119] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0120] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0121] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0122] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pressurizing device for pressurizing a battery cell unit (400), characterized in that, The pressurizing device includes: First pressurization component (100); The second pressurization component (200) is disposed opposite to the first pressurization component (100). A drive assembly (300) is connected to the first pressurizing assembly (100) and the second pressurizing assembly (200), the first pressurizing assembly (100) and the second pressurizing assembly (200) being configured to be detachably pressed onto opposite sides of the cell unit (400), the drive assembly (300) being configured to drive the first pressurizing assembly (100) and the second pressurizing assembly (200) to move toward each other to generate a first pressure and a second pressure acting on the cell unit (400), the first pressure and the second pressure being in opposite directions.

2. The pressurizing device according to claim 1, characterized in that, The first pressurizing component (100) forms a first orthographic projection on the surface of the cell unit (400), and the first orthographic projection covers the cell unit (400). The second pressurizing component (200) forms a second orthographic projection on the surface of the cell unit (400), and the second orthographic projection covers the cell unit (400).

3. The pressurizing device according to claim 1, characterized in that, The drive assembly (300) is connected between the first pressurizing assembly (100) and the second pressurizing assembly (200), and the direction from the drive assembly (300) to the cell unit (400) is a second direction, which intersects with the first direction, and the first direction is parallel to the directions of the first pressure and the second pressure.

4. The pressurizing device according to claim 3, characterized in that, The pressurizing device further includes a first end plate (130) and a second end plate (230), the first end plate (130) and the second end plate (230) being stacked on opposite sides of the battery cell unit (400), the first pressurizing component (100) being detachably connected to the first end plate (130), and the second pressurizing component (200) being detachably connected to the second end plate (230).

5. The pressurizing device according to claim 4, characterized in that, The first pressurizing assembly (100) includes a first pressurizing member (110) and a first connecting rod (120). The first connecting rod (120) is movably inserted through the first end plate (130) in the second direction. The first connecting rod (120) is connected to the first pressurizing member (110), and the first pressurizing member (110) is connected to the driving assembly (300). The second pressurizing assembly (200) includes a second pressurizing member (210) and a second connecting rod (220). The second connecting rod (220) is movably inserted through the second end plate (230) along the second direction. The second connecting rod (220) is connected to the second pressurizing member (210), and the second pressurizing member (210) is connected to the drive assembly (300). The drive assembly (300) drives the first pressurizing member (110) and the second pressurizing member (210) to move toward each other.

6. The pressurizing device according to claim 5, characterized in that, The number of the first pressure member (110) and the second pressure member (210) is at least two. At least two of the first pressure members (110) are located on opposite sides of the cell unit (400) in the second direction and are connected to both ends of the first connecting rod (120). At least two of the second pressure members (210) are located on opposite sides of the cell unit (400) in the second direction and are connected to both ends of the second connecting rod (220).

7. The pressurizing device according to claim 6, characterized in that, The first connecting rod (120) is detachably connected to the first pressure member (110), and / or The second connecting rod (220) is detachably connected to the second pressure member (210).

8. The pressurizing device according to claim 7, characterized in that, The first connecting rod (120) is threadedly connected to the first pressure member (110), and / or The second connecting rod (220) is threadedly connected to the second pressure member (210).

9. The pressurizing device according to claim 6, characterized in that, The number of the first connecting rods (120) is multiple, and the multiple first connecting rods (120) are spaced apart along a third direction, and / or, There are multiple second connecting rods (220), and the multiple second connecting rods (220) are spaced apart along a third direction, and the third direction intersects the second direction and the first direction in pairs.

10. The pressurizing device according to claim 6, characterized in that, The number of the drive components (300) is multiple; The first pressure member (110) and the second pressure member (210) located at one end of the cell unit (400) in the second direction are connected to at least one of the drive components (300). And / or, The first pressure member (110) and the second pressure member (210) located at the other end of the cell unit (400) in the second direction are connected to at least one of the drive components (300).

11. The pressurizing device according to any one of claims 1-10, characterized in that, The drive assembly (300) includes a screw (311), a nut (312), and a hydraulic tensioner (313). The screw (311) passes through the first pressurizing assembly (100) and the second pressurizing assembly (200). The nut (312) is connected to one end of the screw (311), and the hydraulic tensioner (313) is connected to the other end of the screw (311). The nut (312) and the hydraulic tensioner (313) abut against opposite sides of the first pressurizing assembly (100) and the second pressurizing assembly (200), respectively.

12. The pressurizing device according to any one of claims 5-10, characterized in that, The first pressure member (110) includes a first connecting plate (111) and a first mounting plate (112). One end of the first connecting plate (111) is connected to the first mounting plate (112) at an angle. The end of the first connecting plate (111) away from the first mounting plate (112) is detachably connected to the first connecting rod (120); and / or, The second pressure member (210) includes a second connecting plate (211) and a second mounting plate (212). One end of the second connecting plate (211) is connected to the second mounting plate (212) and is set at an angle. The end of the second connecting plate (211) away from the second mounting plate (212) is detachably connected to the second connecting rod (220). The drive assembly (300) is connected to the first mounting plate (112) and the second mounting plate (212).

13. The pressurizing device according to claim 12, characterized in that, The first pressure member (110) further includes a first reinforcing rib (113), the first reinforcing rib (113) being connected to the first connecting plate (111) and the first mounting plate (112); and / or, The second pressure member (210) also includes a second reinforcing rib (213), which is connected to the second connecting plate (211) and the second mounting plate (212).

14. The pressurizing device according to claim 13, characterized in that, The number of the first reinforcing ribs (113) is multiple, and the multiple first reinforcing ribs (113) are spaced apart so that there is a first mounting cavity (114) between adjacent first reinforcing ribs (113). The number of the second reinforcing ribs (213) is multiple, and the multiple second reinforcing ribs (213) are spaced apart so that there is a second mounting cavity (214) between adjacent second reinforcing ribs (213). The drive assembly (300) is disposed within the first mounting cavity (114) and the second mounting cavity (214).

15. A method for manufacturing a battery pack, characterized in that, include: Provides battery cell units (400); A first pressure and a second pressure are applied to the opposite sides of the cell unit (400) in a first direction by the pressurizing device as described in any one of claims 1-14; The battery cell unit (400) is installed in the tray (500); Disconnect the pressurizing device from the battery cell unit (400).

16. The battery pack manufacturing method according to claim 15, characterized in that, The pressurizing device also includes a first end plate (130) and a second end plate (230); The first end plate (130) and the second end plate (230) are stacked on opposite sides of the cell unit (400) in the first direction, and the first end plate (130) and the second end plate (230) respectively abut against the inner wall of the tray (500). The first pressurizing assembly (100) is detachably connected to the first end plate (130), and the second pressurizing assembly (200) is detachably connected to the second end plate (230). The process of disassembling the pressurizing device from the battery cell unit (400) includes: The first pressurizing assembly (100) is disconnected from the first end plate (130), and the second pressurizing assembly (200) is disconnected from the second end plate (230).

17. A battery pack, characterized in that, Prepared by the battery pack preparation method as described in claim 15 or 16.

18. An electrical appliance comprising the battery pack as claimed in claim 17.

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