Adjustable steel belt mechanism, battery module and battery pack

Abstract

This utility model relates to the field of battery technology and discloses an adjustable steel strip mechanism, a battery module, and a battery pack, comprising: a steel strip body; a rotating structure rotatably configured, the steel strip body being wound around the rotating structure; and an adjusting structure pulsatorically connected to the rotating structure, the adjusting structure being adapted to rotate the rotating structure to drive the steel strip body to extend or retract from the rotating structure. This utility model allows for the adjustment of the extension length of the steel strip body according to the size of the battery module, improving compatibility with the battery module, simplifying the process flow, and reducing material consumption. Furthermore, when the battery cells expand or contract, the preload on the battery pack can be adjusted by regulating the extension length of the steel strip body, ensuring that the steel strip body provides a stable preload to the battery pack, thereby ensuring the stability and accuracy of the position of each battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an adjustable steel belt mechanism, a battery module, and a battery pack. Background Technology

[0002] Battery modules are typically formed by stacking multiple battery cells. During assembly, these cells are compressed and stacked before being secured with a ring-shaped steel strap to prevent the module from unraveling. In existing technology, the steel strap is pre-determined to the required length based on the battery module model and then manually fitted to provide pre-tension to the stacked battery cells. Therefore, the length of the steel strap needs to be custom-made for each battery module model, making it unsuitable for different models. Furthermore, during transportation and use, changes in the condition of the battery cells can alter the pre-tension applied by the steel strap. Utility Model Content

[0003] In view of this, the present invention provides an adjustable steel strip mechanism, a battery module and a battery pack to solve the problems in the prior art where the length of the steel strip needs to be specifically manufactured according to the model of the battery module, which cannot be adapted to different models of battery modules. Furthermore, during the transportation and use of the battery module, the preload applied by the steel strip to the battery module changes as the state of the individual battery cells changes.

[0004] In a first aspect, this utility model provides an adjustable steel strip mechanism, comprising: a steel strip body; a rotating structure rotatably configured, wherein the steel strip body is wound around the rotating structure; and an adjusting structure drivingly connected to the rotating structure, wherein the adjusting structure is adapted to cause the rotating structure to rotate, thereby causing the steel strip body to extend or retract from the rotating structure.

[0005] In one optional embodiment, the adjusting structure includes a first gear and a second gear, the first gear being connected to the rotating structure, and the second gear being meshed with the first gear.

[0006] In one alternative embodiment, the adjustment structure further includes a knob that is coaxially connected to the second gear.

[0007] In one alternative embodiment, the second gear has a first rotational direction for retracting the steel belt body and a second rotational direction for extending the steel belt body; the adjustable steel belt mechanism further includes a check valve structure connected to the second gear and adapted to restrict the second gear from rotating in the second rotational direction.

[0008] In one optional embodiment, the adjusting structure includes a torsional elastic element, one end of which is fixedly disposed, and the other end of which is connected to the rotating structure.

[0009] Secondly, this utility model also provides a battery module, including: a battery pack including a plurality of cells arranged in a row; end plates, wherein the end plates are provided on opposite sides of the battery pack along the arrangement direction; and the aforementioned adjustable steel strip mechanism, which is fixedly disposed on one side of the end plate, wherein the steel strip body extends through the battery pack and connects to the end plate on the other side or wraps around the battery pack and connects to the same end plate, and the extension length of the steel strip body is adjustable.

[0010] In one alternative embodiment, the end of the steel strip body away from the rotating structure is either fixedly connected to or detachably connected to the end plate.

[0011] In one optional embodiment, the battery module further includes a fastener that passes through the steel strip body and is fastened to the end plate; or, the battery module further includes a snap-fit ​​structure that is disposed on one end of the steel strip body away from the rotating structure and one of the end plates, and a slot is formed on the other end of the steel strip body away from the rotating structure and the other end plate, and the snap-fit ​​structure and the slot engage with each other.

[0012] In one optional embodiment, the adjustable steel strip mechanism is fixedly disposed on one side of the end plate, and the steel strip body extends through the top surface of the battery pack and connects to the end plate on the other side; the battery module further includes an annular fixing steel strip, which is circumferentially sleeved on the battery pack.

[0013] Thirdly, the present invention also provides a battery pack, comprising: a housing; the aforementioned adjustable steel strip mechanism disposed within the housing; or, the battery pack comprising: a housing; the aforementioned battery module disposed within the housing, and the end plate connected to the housing.

[0014] The technical solution of this application has the following advantages:

[0015] The steel strip is wound around a rotating structure. Under the action of an adjusting structure, the rotating structure rotates, causing the steel strip to be buffered within or extend beyond the rotating structure. This allows for adjustment of the steel strip's extension length, enabling the extension length to be adjusted according to the battery module's dimensions. This improves compatibility with the battery module, simplifies the process, and reduces material consumption. Furthermore, when the battery cells expand or contract, the preload on the battery pack can be adjusted by regulating the extension length of the steel strip, ensuring a stable preload and guaranteeing the stability and accuracy of each cell's position. This also facilitates the automation of steel strip installation, improving installation efficiency and success rate. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an adjustable steel belt mechanism according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of another adjustable steel belt mechanism according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the battery module structure according to an embodiment of the present invention;

[0020] Figure 4 This is a structural schematic diagram of the battery module from another angle according to an embodiment of the present invention;

[0021] Figure 5 for Figure 4 A magnified view of part A in the diagram.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Steel strip body; 2. Rotating structure; 21. Drum; 22. Shaft; 3. Adjusting structure; 31. First gear; 32. Second gear; 33. Knob; 34. Torque elastic element; 4. Check valve structure; 5. Outer shell; 10. Adjustable steel strip mechanism; 20. Battery pack; 201. Battery cell; 30. End plate; 40. Annular fixed steel strip; 50. Buckle structure; 60. Slot. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0026] According to an embodiment of the present invention, an adjustable steel strip mechanism 10 is provided, comprising: a steel strip body 1; a rotating structure 2, rotatably configured, wherein the steel strip body 1 is wound around the rotating structure 2; and an adjusting structure 3, which is connected to the rotating structure 2 in a transmission manner, wherein the adjusting structure 3 is adapted to cause the rotating structure 2 to rotate, thereby causing the steel strip body 1 to extend or retract from the rotating structure 2.

[0027] By applying the adjustable steel strip mechanism 10 of this embodiment, the steel strip body 1 is wound around the rotating structure 2. Under the action of the adjusting structure 3, the rotating structure 2 is rotated, thereby causing the steel strip body 1 to be buffered or extended out of the rotating structure 2, and thus the extension length of the steel strip body 1 can be adjusted. Therefore, the extension length of the steel strip body 1 can be adjusted at any time according to the size of the battery module, improving the adaptability with the battery module, simplifying the process flow, and reducing material consumption. In addition, when the battery cell 201 expands or contracts, the preload on the battery pack 20 can be adjusted by adjusting the extension length of the steel strip body 1, ensuring that the steel strip body 1 can provide a stable preload to the battery pack 20, thereby ensuring the stability and accuracy of the position of each battery cell 201. Furthermore, it facilitates the automation of steel strip installation, improving the efficiency and success rate of steel strip installation.

[0028] Understandably, when it is necessary for the steel strip body 1 to retract from the rotating structure 2, the rotating structure 2 can be rotated in the positive direction; when it is necessary for the steel strip body 1 to extend from the rotating structure 2, the rotating structure 2 can be rotated in the opposite direction. The steel strip body 1 is a strip-shaped structure with a certain length and two ends. One end is connected to the rotating structure 2 so that the steel strip body 1 is wound on the rotating structure 2, and the other end is a free end that can be connected and fixed to the end plate 30.

[0029] It is worth noting that the adjustable steel strip mechanism 10 of this embodiment can not only be applied to the binding and fixing of multiple cells 201 in a battery module, but also to other structures that require binding and fixing.

[0030] The following two examples illustrate two specific implementations of the adjustment structure 3.

[0031] In the first embodiment, such as Figure 1 As shown, the adjusting structure 3 includes a first gear 31 and a second gear 32. The first gear 31 is connected to the rotating structure 2, and the second gear 32 is meshed with the first gear 31. Therefore, by rotating the second gear 32, the first gear 31 is driven to rotate under the meshing action of the second gear 32 and the first gear 31, which in turn drives the rotating structure 2 to rotate, thereby realizing the extension or retraction of the steel belt body 1.

[0032] In the first embodiment, such as Figure 1 As shown, the adjustment structure 3 also includes a knob 33, which is coaxially connected to the second gear 32. Rotating the knob 33 causes the second gear 32 to rotate.

[0033] In the first embodiment, such as Figure 1 As shown, the second gear 32 has a first rotational direction (i.e., the aforementioned positive direction) for retracting the steel belt body 1, and a second rotational direction (i.e., the aforementioned reverse direction) for extending the steel belt body 1; the adjustable steel belt mechanism 10 also includes a check structure 4, which is connected to the second gear 32 and adapted to restrict the second gear 32 from rotating in the second rotational direction. This configuration allows control over the extension length of the steel belt body 1, preventing the steel belt body 1 from becoming too long and thus failing to maintain a taut state.

[0034] Specifically, the check mechanism 4 can be a ratchet mechanism, a damping mechanism, etc.

[0035] It is worth noting that when it is necessary to extend the steel belt body 1, the restriction of the check structure 4 on the second gear 32 can be removed, thereby enabling the second gear 32 to rotate in the second rotation direction.

[0036] In the first embodiment, such as Figure 1 As shown, the rotating structure 2 includes a drum 21 and a rotating shaft 22. The steel strip body 1 is wound around the drum 21, the rotating shaft 22 is coaxially connected to the drum 21, and the rotating shaft 22 is coaxially connected to the first gear 31.

[0037] In the first embodiment, such as Figure 1 As shown, the first gear 31 and the second gear 32 are bevel gears that mesh perpendicularly at 90°. Of course, in other alternative embodiments, the first gear 31 and the second gear 32 may also be other types of gears.

[0038] In the first embodiment, such as Figure 1As shown, the adjustable steel belt mechanism 10 also includes a housing 5, with at least a portion of the rotating structure 2 and the adjusting structure 3 disposed within the housing 5, and the steel belt body 1 adapted to extend out from inside the housing 5. Specifically, in the first embodiment, the drum 21 is rotatably connected to the housing 5, the gear shaft of the second gear 32 is rotatably connected to the housing 5, a portion of the gear shaft of the second gear 32 extends into the housing 5 to connect with the second gear 32, and a portion of the gear shaft of the second gear 32 extends out of the housing 5 to connect with the knob 33, thereby placing the knob 33 outside the housing 5 for easy use.

[0039] In the second embodiment, as Figure 2 As shown, the adjusting structure 3 includes a torsional elastic element 34, one end of which is fixedly installed, and the other end of which is connected to the rotating structure 2. Therefore, when the steel strip body 1 extends, it drives the rotating structure 2 to rotate, simultaneously causing the torsional elastic element 34 to twist and store energy, thus tensioning the steel strip body 1 under the action of elastic force. Furthermore, by providing the torsional elastic element 34, it is possible to further twist or relax the torsional elastic element 34 when the battery cell 201 expands or contracts, thereby allowing the extension length of the steel strip body 1 to be adjusted in real time according to the state of the battery cell 201, ensuring that the steel strip body 1 provides a stable preload to the battery pack 20.

[0040] In the second embodiment, as Figure 2 As shown, the adjustable steel belt mechanism 10 also includes a housing 5, with the rotating structure 2 and adjusting structure 3 both disposed within the housing 5, and the steel belt body 1 adapted to extend out from inside the housing 5. Specifically, in the second embodiment, the first end of the torsion elastic member 34 is fixedly connected to the housing 5, and the second end of the torsion elastic member 34 is connected to the rotating structure 2.

[0041] In the second embodiment, as Figure 2 As shown, the rotating structure 2 includes a drum 21 and a rotating shaft 22. The steel strip body 1 is wound around the drum 21, the rotating shaft 22 is coaxially connected to the drum 21, and the rotating shaft 22 is connected to the second end of the torsion elastic member 34.

[0042] Specifically, in the second embodiment, the torsion elastic element 34 is a torsion spring. Furthermore, the adjustable steel belt mechanism 10 also includes a limiting shell, which is disposed inside the outer shell 5 and surrounds the outer periphery of the torsion elastic element 34.

[0043] It is worth noting that a torsional elastic element 34 with appropriate elastic force can be selected according to actual needs.

[0044] According to an embodiment of the present invention, on the other hand, as... Figure 3As shown, a battery module is also provided, including: a battery pack 20, including a plurality of battery cells 201 arranged in a row; end plates 30, with end plates 30 provided on both sides of the battery pack 20 along the arrangement direction; the aforementioned adjustable steel strip mechanism 10, which is fixedly provided on one side of the end plate 30, and the steel strip body 1 extends through the battery pack 20 and connects to the end plate 30 on the other side, or wraps around the battery pack 20 and connects to the same end plate 30, and the extension length of the steel strip body 1 is adjustable.

[0045] The battery module of this embodiment uses an adjustable steel strip mechanism 10 to fix the battery pack 20. The extension length of the steel strip body 1 is adjustable, so that when the battery cell 201 expands or contracts, the preload on the battery pack 20 can be adjusted by adjusting the extension length of the steel strip body 1, so as to ensure that the steel strip body 1 can provide a stable preload to the battery pack 20, thereby ensuring the stability and accuracy of the position of each battery cell 201.

[0046] It is worth noting that, please refer to Figure 3 When the adjustable steel strip mechanism 10 is fixedly installed on one end plate 30, and the steel strip body 1 extends through the battery pack 20 and connects to the other end plate 30, one side of the end plate 30 is fixedly installed to the battery pack housing, and the steel strip body 1 extends from the other side of the battery pack 20, thereby fixing the battery pack 20 longitudinally to ensure the alignment of multiple cells 201 on the top surface, making the cell stacking of 201 more flat and facilitating the installation and heat dissipation of the battery module. When the adjustable steel strip mechanism 10 is fixedly installed on one end plate 30, and the steel strip body 1 wraps around the battery pack 20 and connects to the same end plate 30, the battery pack 20 can be fixed circumferentially by the adjustable steel strip mechanism 10 to ensure the alignment of multiple cells 201 on the side.

[0047] It should be noted that in related technologies, the steel strip on the battery pack 20 is of a fixed length. When the battery cell 201 contracts (e.g., due to contraction when transitioning from a hot to a cold environment), the steel strip cannot be tensioned, thus failing to stably restrict the battery pack 20. However, multiple battery cells 201 are connected via a busbar on one side of the battery pack 20, forming a single unit. During use or transport of the battery module, vibration or jolting can cause the battery cells 201 to move, leading to the detachment of the welded joints between the busbar and the battery cells 201, resulting in an open circuit in the battery cells 201, and potentially even causing the entire battery module to fail. Therefore, in this embodiment, by providing an adjustable steel strip mechanism 10, the battery pack 20 can be reliably restricted, ensuring a reliable connection between the busbar and each battery cell 201, and guaranteeing the normal and safe operation of the battery module.

[0048] Furthermore, when the cell 201 expands (e.g., during charge-discharge cycles), the steel strip will be further tightened, posing a risk of damage to the cell 201 and breakage of the steel strip. Therefore, in related technologies, buffer structures are typically provided between adjacent cells 201 and / or between the cell 201 and the end plate 30 to absorb the expansion of the cell 201. However, the buffer structure will occupy additional space in the battery pack, affecting the energy density of the battery pack. Therefore, in this embodiment, by providing an adjustable steel strip mechanism 10, excessive tightening of the steel strip can be avoided without the need for a buffer structure, ensuring the integrity of the cell 201 and the steel strip.

[0049] Furthermore, in related technologies, for different models of battery modules, steel strips of fixed lengths are typically required based on their dimensions. This leads to a change in the number of battery cells 201, necessitating the replacement of steel strips of different lengths to adapt to the new battery module, resulting in complex processes and material waste. In this embodiment, however, the extension length of the steel strip body 1 can be adjusted at any time according to the dimensions of the battery module, improving compatibility with the battery module, simplifying the process, and reducing material consumption.

[0050] It is worth noting that, using the adjustment structure 3 in the first embodiment, the extension length of the steel strip body 1 can be manually adjusted to regulate the tension of the steel strip body 1. Using the adjustment structure 3 in the second embodiment, the extension length of the steel strip body 1 can be automatically adjusted to regulate the tension of the steel strip body 1. Therefore, it can be selected and used according to actual needs.

[0051] In one embodiment, the end of the steel strip body 1 furthest from the rotating structure 2 is detachably connected to the end plate 30. This arrangement facilitates the assembly and disassembly of the steel strip body 1, makes maintenance and replacement of the battery pack 20 easier, and reduces the maintenance cost of the battery pack.

[0052] It is worth noting that in related technologies, adjacent cells 201 are usually bonded together with adhesive to form a whole, and then fixed by a steel strip along the circumference. Therefore, when one or more cells 201 fail, it is impossible to remove and replace the individual cells 201, resulting in the scrapping of the entire battery module. In this embodiment, however, the adjustable steel strip mechanism 10 can provide a stable preload to the battery pack 20. Therefore, it is not necessary to bond adjacent cells 201 or reduce the bonding area of ​​adjacent cells 201. Under the fixing action of the adjustable steel strip mechanism 10, the battery pack 20 can form a stable whole. Furthermore, when it is necessary to replace one or more cells 201, or to add or remove some cells 201, the battery pack 20 can be adjusted by removing the end of the steel strip body 1 away from the rotating structure 2 from the end plate 30 (i.e., canceling the connection with the end plate 30). This facilitates the maintenance of the battery module and reduces the maintenance cost of the battery pack.

[0053] Specifically, in one embodiment, the battery module further includes fasteners that penetrate the steel strip body 1 and are fastened to the end plate 30. That is, the steel strip body 1 and the end plate 30 are connected by fasteners (e.g., bolts), and the steel strip body 1 and the end plate 30 can be fixed and separated by removing and installing the fasteners.

[0054] Alternatively, in other alternative implementations, such as Figure 4 and Figure 5 As shown, the battery module also includes a snap-fit ​​structure 50, which is disposed on one end of the steel strip body 1 away from the rotating structure 2 and one of the end plates 30. A slot 60 is provided on the other end of the steel strip body 1 away from the rotating structure 2 and the end plate 30, and the snap-fit ​​structure 50 and the slot 60 engage. That is, the snap-fit ​​structure 50 and the slot 60 achieve a detachable connection between the steel strip body 1 and the end plate 30. Furthermore, when the steel strip body 1 is buffered within the rotating structure 2 (i.e., when there is no need to limit or fix the battery pack 20), the snap-fit ​​structure 50 can be exposed outside the outer casing 5. In other words, the snap-fit ​​structure 50 does not need to be housed inside the outer casing 5. This allows the snap-fit ​​structure 50 to be easily gripped when the steel strip body 1 is needed to fix the battery pack 20, thereby pulling out the steel strip body 1 to fix the battery pack 20 longitudinally or circumferentially. At this point, it is easier to automate the installation of the steel strip, for example, by using a robotic arm to grab the buckle structure 50 and move the buckle structure 50, and by extending the steel strip body 1 and engaging it with the slot 60.

[0055] It is understandable that when the end of the steel strip body 1 furthest from the adjusting structure 3 is provided with a slot 60, the end plate 30 is correspondingly provided with a buckling structure 50 (see [link]). Figure 5When the end of the steel strip body 1 away from the adjustment structure 3 is provided with a buckle structure 50, a corresponding slot 60 is provided on the end plate 30.

[0056] Of course, as an alternative implementation, the end of the steel strip body 1 away from the rotating structure 2 can also be fixedly connected to the end plate 30, for example, by welding or bonding.

[0057] As one specific implementation, the adjustable steel strip mechanism 10 is fixedly installed on one side of the end plate 30, and the steel strip body 1 extends through the top surface of the battery pack 20 and connects to the other side of the end plate 30; the battery module also includes an annular fixed steel strip 40, which is circumferentially sleeved on the battery pack 20.

[0058] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: a housing; and the aforementioned adjustable steel strip mechanism 10, disposed within the housing. The adjustable steel strip mechanism 10 can be connected to the housing, for example, a base plate, a cold plate, etc.

[0059] Alternatively, in another embodiment, the battery pack includes: a housing; the aforementioned battery module, disposed within the housing, with the end plate 30 connected to the housing.

[0060] It is worth noting that the battery pack contains one or more battery modules.

[0061] When assembling the battery module of this embodiment, the end plate 30 and the battery pack 20 are pressed into place at the extrusion stacking station. The steel strip body 1 is pulled out from the rotating structure 2 on one side of the end plate 30, passes through the battery pack 20, and is then fixed to the end plate 30 on the other side or the same side, thus realizing the installation of the steel strip body 1. After the steel strip body 1 is installed, the pretension of the steel strip body 1 is further adjusted by the knob 33 to ensure the binding force of the battery module. In addition, before the battery module is transferred out of the factory, the tension of the steel strip body 1 can be further adjusted by the adjustment structure 3 to provide appropriate pretension to the battery pack 20, ensuring the alignment, extrusion degree, and stability of the battery pack 20, and ensuring the safety of the battery cell 201.

[0062] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An adjustable steel belt mechanism characterized in that, include: Steel strip body (1); The rotating structure (2) is rotatably configured, and the steel strip body (1) is wound around the rotating structure (2); An adjustment structure (3) is connected to the rotating structure (2) for transmission. The adjustment structure (3) is adapted to make the rotating structure (2) rotate so as to drive the steel belt body (1) to extend or retract from the rotating structure (2).

2. The adjustable steel belt mechanism of claim 1, wherein, The adjustment structure (3) includes a first gear (31) and a second gear (32). The first gear (31) is connected to the rotating structure (2), and the second gear (32) is meshed with the first gear (31).

3. The adjustable steel belt mechanism of claim 2, wherein, The adjustment structure (3) also includes a knob (33), which is coaxially connected to the second gear (32).

4. The adjustable steel belt mechanism of claim 2, wherein, The second gear (32) has a first rotational direction that causes the steel belt body (1) to retract and a second rotational direction that causes the steel belt body (1) to extend; the adjustable steel belt mechanism (10) further includes a check structure (4) connected to the second gear (32) and adapted to restrict the second gear (32) from rotating in the second rotational direction.

5. The adjustable steel belt mechanism of claim 1, wherein, The adjustment structure (3) includes a torsion elastic element (34), one end of which is fixedly disposed, and the other end of which is connected to the rotation structure (2).

6. A battery module, characterized by include: A battery pack (20) includes multiple battery cells (201) arranged in a row; End plates (30) are provided on both sides of the battery pack (20) along the arrangement direction; The adjustable steel strip mechanism (10) according to any one of claims 1 to 5 is fixedly disposed on one side of the end plate (30), the steel strip body (1) extends through the battery pack (20) and connects to the end plate (30) on the other side or surrounds the battery pack (20) and connects to the same end plate (30), and the extension length of the steel strip body (1) is adjustable.

7. The battery module of claim 6, wherein, The end of the steel strip body (1) away from the rotating structure (2) is fixedly connected to the end plate (30) or detachably connected.

8. The battery module of claim 7, wherein, The battery module also includes fasteners that penetrate the steel strip body (1) and are fastened to the end plate (30); or, The battery module also includes a snap-fit ​​structure (50), which is disposed on one end of the steel strip body (1) away from the rotating structure (2) and one of the end plates (30). A slot (60) is provided on the other end of the steel strip body (1) away from the rotating structure (2) and the end plate (30). The snap-fit ​​structure (50) and the slot (60) are engaged.

9. The battery module of claim 6, wherein, The adjustable steel strip mechanism (10) is fixedly installed on the end plate (30) on one side. The steel strip body (1) extends through the top surface of the battery pack (20) and connects to the end plate (30) on the other side. The battery module also includes an annular fixing steel strip (40), which is circumferentially sleeved on the battery pack (20).

10. A battery pack, characterized by, include: Box; The adjustable steel belt mechanism (10) of any one of claims 1 to 5, disposed within the box; Alternatively, the battery pack comprises: A box; The battery module of any one of claims 6 to 9, disposed within the box, the end plate (30) connected with the box.

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