A battery pack

Abstract

This utility model relates to the field of battery technology and discloses a battery pack, including a housing with a receiving groove. The receiving groove has a first limiting structure and a first positioning seat, and the first positioning seat has a first positioning hole. A battery module assembly is detachably disposed in the receiving groove and abuts against the first limiting structure. The battery module assembly has a second limiting structure with a second fixing hole. When the first limiting structure abuts against the battery module assembly, it restricts the horizontal freedom of the battery module assembly and aligns the second fixing hole with the first positioning hole. The advantages of this utility model are high installation efficiency, high stability, and simple structure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] With the rapid development of electric vehicles, energy storage devices, and other fields, battery packs, as core energy storage units, are receiving increasing attention for their performance, safety, and reliability. A battery pack typically consists of a housing and battery modules housed within it. In existing technologies, installing and securing the battery modules into the battery pack housing is a crucial step. A common practice is to place the battery modules into mounting slots in the housing and then secure them to pre-drilled holes in the housing using bolts or other fasteners. However, after placing the battery modules into the housing, their position needs to be repeatedly adjusted manually or with auxiliary equipment to ensure precise alignment between the mounting holes on the module and the positioning holes on the housing, facilitating subsequent fastening. This process is not only time-consuming and labor-intensive, but also inefficient and prone to human error. Furthermore, during vehicle operation or equipment operation, the battery pack inevitably experiences dynamic loads such as vibration, impact, and inertial forces caused by changes in acceleration. Relying solely on bolts for fixation may result in insufficient connection constraints, affecting structural stability. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a battery pack with high installation efficiency, high stability and simple structure.

[0004] The technical solution adopted by this utility model to solve its technical problem is to provide a battery pack, comprising:

[0005] The housing has a receiving groove, in which a first limiting structure and a first positioning seat are provided, and the first positioning seat is provided with a first positioning hole;

[0006] A battery module assembly is detachably disposed within the receiving groove and abuts against the first limiting structure. The battery module assembly is provided with a second limiting structure, which is provided with a second fixing hole. When the first limiting structure abuts against the battery module assembly, it can restrict the degree of freedom of the battery module assembly in the horizontal direction and align the second fixing hole with the first positioning hole.

[0007] In one of the battery packs described above, the first limiting structure is provided in two sets, which are detachably disposed on both sides of the receiving groove and are lower than the height of the battery module assembly. The straight-line distance between the two sets of the first limiting structure is adapted to the length or width of the battery module assembly.

[0008] In the aforementioned battery pack, the two short sides of the receiving slot are respectively provided with second positioning seats, the second positioning seats are provided with second positioning holes, the first limiting structure is provided with a first fixing hole that penetrates itself, and the first fixing hole and the second positioning hole are connected by fasteners.

[0009] In one of the aforementioned battery packs, the battery module assembly has an upward-facing snap-fit ​​groove on one side. The second limiting structure is detachably snapped into the snap-fit ​​groove and contacts at least two different sides of the battery module assembly. The second fixing hole is located at one end of the second limiting structure near the receiving groove and is connected to the first positioning hole by a fastener. After the second fixing hole is connected to the first positioning hole, it can restrict the movement of the battery module assembly.

[0010] In the aforementioned battery pack, the second limiting structure includes a first limiting part, a second limiting part, and a third limiting part connected vertically in sequence. The second limiting part is engaged in the engaging groove. The first limiting part and the third limiting part respectively contact different sides of the battery module assembly, and each of them has a horizontally arranged fixing edge at the end away from the second limiting part. The second fixing hole is provided on the fixing edge and penetrates the fixing edge. The fixing edge is also provided with a positioning groove that penetrates itself. The first positioning seat is provided with a positioning protrusion that forms an insertion fit with the positioning groove.

[0011] In the aforementioned battery pack, multiple snap-fit ​​slots are provided and arranged at intervals along the length direction of the battery module assembly. Multiple second limiting structures are provided accordingly, and a buffer is provided between each snap-fit ​​slot and the second limiting part.

[0012] In one of the aforementioned battery packs, a mounting plate for mounting a BMS component is included. The mounting plate is disposed on the side of the second limiting structure opposite to the battery module component. The mounting plate has a fourth positioning hole that penetrates itself. The second limiting structure has a positioning post on the side facing the mounting plate. The positioning post and the fourth positioning hole form an insertion fit, and the positioning post can restrict the degree of freedom of the mounting plate in the horizontal direction.

[0013] In one of the battery packs described above, a third positioning seat is provided in the receiving groove, the third positioning seat is provided with a third positioning hole, and the mounting plate is provided with a third fixing hole that penetrates itself; when the positioning post is inserted into the fourth positioning hole, the third positioning hole is aligned with the third fixing hole and connected by fasteners.

[0014] In one of the aforementioned battery packs, the battery module assembly includes a battery module body and a protective shell. The protective shell is made of metal and has an opening on the top side. The battery module body is detachably placed inside the protective shell, and the height of the battery module body is adapted to the height of the protective shell.

[0015] In one of the battery packs described above, the outer walls on both sides of the housing are provided with handle grooves that are recessed from the outside to the inside. The straight-line distance between the bottoms of the two handle grooves is adapted to the length of the battery module assembly. At least one of the handle grooves is provided with a test hole that communicates with the inside of the housing. A vent valve is detachably provided on the test hole.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. In this utility model, by setting a first limiting structure within the receiving groove of the housing and configuring a detachable second limiting structure on the battery module assembly, when the battery module assembly is installed in place and abuts against the first limiting structure, its degree of freedom in the horizontal direction can be automatically restricted. Simultaneously, the second fixing hole on the second limiting structure is precisely aligned with the first positioning hole on the first positioning seat within the housing. This design significantly reduces the reliance on repeated manual position adjustments during traditional assembly processes, improving assembly efficiency and positioning accuracy, and reducing the risk of human error.

[0018] 2. In this utility model, the first limiting structure is provided in two sets, detachably disposed on both sides of the receiving groove, and its height is lower than that of the battery module assembly. The straight-line distance between the two sets is adapted to the length or width of the battery module assembly. This design not only achieves spacing adjustment through the detachable structure, facilitating adaptation to battery modules of different specifications and improving the versatility and compatibility of the housing, but also avoids interference with the module assembly path or other internal components through the lower height design. In addition, the symmetrically arranged limiting structures on both sides form a clamping constraint, effectively preventing horizontal displacement or rotation of the battery module during installation or operation, significantly improving positioning stability.

[0019] 3. In this utility model, a snap-fit ​​groove is provided on one side of the battery module assembly. The second limiting structure is detachably snapped into the snap-fit ​​groove and contacts at least two different sides of the battery module assembly. The second fixing hole is provided at the end of the second limiting structure near the receiving groove and is connected to the first positioning hole by a fastener. After connection, it can restrict the movement of the battery module assembly. This design, through the cooperation of the snap-fit ​​groove and the second limiting structure, achieves multi-directional constraint on the battery module assembly, enhancing connection rigidity and anti-disturbance capability. At the same time, this detachable snap-fit ​​method does not require direct drilling on the module body, protecting the integrity of the internal structure, facilitating later maintenance and replacement, and further improving the stability and maintainability of the battery module after fixing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a battery pack according to the present invention.

[0021] Figure 2 This is an exploded view of a battery pack according to the present invention.

[0022] Figure 3 This is a cross-sectional view of a battery pack according to the present invention.

[0023] Figure 4 This is a partial exploded view of the battery pack according to the present invention.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0025] 100. Housing; 110. Base; 111. Receiving groove; 112. Handle groove; 113. Test hole; 114. Vent valve; 120. Housing cover; 200. Battery module assembly; 210. Battery module body; 211. Snap-fit ​​groove; 212. Buffer; 220. Protective shell; 300. BMS assembly; 310. Mounting hole; 400. First limiting structure; 410. First fixing hole; 500. First positioning seat; 510. First positioning hole; 5 20. Positioning protrusion; 600. Second limiting structure; 610. First limiting part; 620. Second limiting part; 621. Positioning post; 630. Third limiting part; 640. Fixing edge; 641. Second fixing hole; 642. Positioning groove; 700. Second positioning seat; 710. Second positioning hole; 800. Mounting plate; 810. Fourth positioning hole; 820. Third fixing hole; 830. Support post; 900. Third positioning seat; 910. Third positioning hole. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] like Figures 1 to 4 As shown, in this embodiment, a battery pack includes:

[0032] The housing 100 has a receiving groove 111, in which a first limiting structure 400 and a first positioning seat 500 are provided, and the first positioning seat 500 is provided with a first positioning hole 510.

[0033] The battery module assembly 200 is detachably disposed within the receiving groove 111 and abuts against the first limiting structure 400. The battery module assembly 200 also has a second limiting structure 600 with a second fixing hole 641. When the first limiting structure 400 abuts against the battery module assembly 200, it restricts the horizontal freedom of the battery module assembly 200 and aligns the second fixing hole 641 with the first positioning hole 510. This design significantly reduces the reliance on repeated manual adjustments during traditional assembly processes, improving assembly efficiency and positioning accuracy, and reducing the risk of human error.

[0034] Specifically, such as Figures 1 to 4 As shown, in this embodiment, the battery pack mainly includes a housing 100 and a battery module assembly 200 and a BMS assembly 300 (battery management system) built into the housing 100, which is suitable for application scenarios such as electric vehicles and energy storage systems.

[0035] In this embodiment, the housing 100 has an overall rectangular structure and is assembled from a base 110 and a cover 120, which can be detachably connected by bolts or clips. Preferably, the housing 100 is made of plastic, which has good insulation, corrosion resistance and lightweight advantages.

[0036] Furthermore, the base 110 of the housing 100 is provided with a rectangular receiving groove 111 for accommodating the battery module assembly 200. The size of the receiving groove 111 is larger than the size of the battery module assembly 200, ensuring that the battery module assembly 200 can be installed smoothly and leaving a certain gap for the installation of other components.

[0037] To improve the positioning accuracy and fixing stability of the battery module assembly 200, a first limiting structure 400 and a first positioning seat 500 are provided in the receiving groove 111. The first limiting structure 400 is one or more sets, fixedly or detachably disposed on the short or long side of the receiving groove 111, used to limit the horizontal position of the battery module. The first positioning seat 500 is one or more, fixedly disposed in the receiving groove 111, and each first positioning seat 500 is provided with a first positioning hole 510, used to achieve positioning engagement with the second limiting structure 600 on the battery module assembly 200. Preferably, the first positioning hole 510 is a threaded hole. When the battery module assembly 200 is placed into the receiving groove 111 and limited by the first limiting structure 400, its horizontal position is fixed, thereby allowing the second fixing hole 641 on the second limiting structure 600 to automatically align with the first positioning hole 510 on the first positioning seat 500. This design avoids the need for repeated manual adjustments to align bolt holes, as required in existing technologies, eliminating the tedious manual hole alignment process and significantly improving assembly efficiency and installation consistency.

[0038] Furthermore, two sets of first limiting structures 400 are provided, detachably and symmetrically arranged on both sides of the bottom of the receiving groove 111, and the straight-line distance between the two sets of first limiting structures 400 is adapted to the length or width of the battery module assembly 200, thereby limiting the battery module assembly 200 in the horizontal direction. Specifically, when the two sets of first limiting structures 400 are provided on the two short sides of the receiving groove 111, the straight-line distance between them matches the length of the battery module assembly 200; when the two sets of first limiting structures 400 are provided on the two long sides of the receiving groove 111, the straight-line distance between them matches the width of the battery module assembly 200. This design, by adopting a detachable connection method, facilitates the adjustment of the distance between the two sets of first limiting structures 400, thereby adapting to battery module assemblies 200 of different sizes and specifications, significantly improving the versatility of the housing 100 structure. In addition, the symmetrically arranged limiting structure on both sides forms a clamping constraint, which can effectively limit the translational and rotational degrees of freedom of the battery module assembly 200 in the horizontal direction, prevent it from shifting during assembly or operation, and significantly enhance the stability and reliability of installation and positioning.

[0039] Preferably, the two sets of first limiting structures 400 are disposed on the two short sides of the receiving groove 111. This arrangement not only helps to reduce the structural size of the first limiting structure 400 itself, reducing material consumption and manufacturing costs, but also allows the second limiting structure 600 to achieve effective connection without extending significantly along the length direction. Therefore, its structural length can be shortened accordingly, further optimizing the overall layout and improving the utilization rate of the internal space of the shell 100.

[0040] Furthermore, the two sets of first limiting structures 400 extend vertically upward from the bottom of the self-accommodating groove 111, with the height of the extended section being lower than the height of the battery module assembly 200. This design avoids interference with the module assembly path or other internal components.

[0041] Furthermore, the first limiting structure 400 is made of metallic materials (such as aluminum alloy, stainless steel, or cold-rolled steel sheet) to ensure that it has sufficient structural strength and wear resistance, and can stably perform its limiting function over a long period of time. The first limiting structure 400 is generally rectangular strip in shape and has a hollow structure, which can reduce its own weight and material cost, and also help to improve bending stiffness and enhance structural stability.

[0042] To achieve a detachable connection with the housing 100, the first limiting structure 400 is provided with at least one circular first fixing hole 410 penetrating vertically. Preferably, the first fixing holes 410 are provided in two sets, spaced apart along the length of the first limiting structure 400, to improve the stability and torsional resistance of the connection. Correspondingly, the two short sides of the receiving groove 111 are respectively provided with second positioning seats 700, which extend vertically upward from the bottom of the receiving groove 111 and are provided with second positioning holes 710. Preferably, the second positioning holes 710 are threaded holes, which can be directly locked with fasteners (such as screws or bolts) without the need for additional nuts, effectively simplifying the assembly process.

[0043] In this embodiment, the battery module assembly 200 includes a battery module body 210 and a protective shell 220 for housing and protecting the battery module body 210. The battery module body 210 is composed of multiple battery cells arranged in a matrix. Insulating pads or buffer materials may be provided between adjacent battery cells to achieve electrical insulation and mechanical buffering. End plates are provided at both ends of the battery cell assembly, and multiple battery cells are pre-tightened and fixed along the compression direction by pull rods to form a stable modular structure.

[0044] Furthermore, the protective shell 220 is made of a metallic material (such as aluminum alloy, stainless steel, or cold-rolled steel sheet), possessing good mechanical strength, thermal conductivity, and fire-retardant properties. The protective shell 220 has an opening at the top, facilitating the assembly and disassembly of the battery module body 210, thus achieving a maintainable design.

[0045] Furthermore, the battery module body 210 is detachably housed within the protective shell 220, with its overall height matching that of the protective shell 220. This design not only provides additional mechanical protection for the battery module body 210 through the metal protective shell 220, enhancing its resistance to compression and impact, but also serves as thermal insulation and flame barrier. Especially under extreme operating conditions, when thermal runaway occurs in the battery cell, it can effectively suppress the direct impact of high-temperature jets on the battery pack casing 100, preventing high-temperature flames or molten materials from igniting or melting through the plastic casing 100, significantly improving the overall safety and heat spread resistance of the battery pack.

[0046] Furthermore, the battery module assembly 200 is detachably disposed within the receiving groove 111. During assembly, its initial horizontal positioning and limiting are achieved by the outer wall of the protective shell 220 abutting against the first limiting structure 400 disposed within the receiving groove 111. This abutting engagement effectively restricts the degree of freedom of the battery module assembly 200 in the length or width direction, preventing it from shifting during installation or operation.

[0047] Furthermore, the battery module body 210 is provided with a second limiting structure 600. The second limiting structure 600 is located on the side of the battery module body 210 corresponding to the opening of the protective shell 220 (i.e., the top area) and extends towards the bottom of the receiving groove 111. The extended end is provided with a circular second fixing hole 641 to cooperate with the first positioning hole 510. When the battery module assembly 200 is installed in place, the second fixing hole 641 corresponds to and is precisely aligned with the first positioning hole 510 in the first positioning seat 500 on the shell 100. The two are connected by fasteners (such as bolts or screws), and the connection can restrict the movement of the battery module assembly 200, thereby achieving reliable fixation between the battery module assembly 200 and the shell 100.

[0048] Furthermore, the end plate of the battery module body 210 is provided with an upward-facing U-shaped snap-fit ​​groove 211 on the side near the opening of the protective shell 220. The second limiting structure 600 is detachably snapped into the snap-fit ​​groove 211 and contacts at least two different sides of the battery module assembly 200.

[0049] Furthermore, the second limiting structure 600 is generally U-shaped, comprising a first limiting part 610, a second limiting part 620, and a third limiting part 630 connected vertically in sequence. The second limiting part 620 is engaged within the engaging groove 211 and forms surface contact with the end plate of the battery module body 210. The first limiting part 610 and the third limiting part 630 respectively form surface contact with two different sides of the protective shell 220, and each has a horizontally arranged fixing edge 640 at its end away from the second limiting part 620. A second fixing hole 641 is provided on and penetrates the fixing edge 640, facilitating vertical installation of fasteners and achieving a reliable connection.

[0050] Furthermore, the fixed edge 640 is also provided with a through-hole positioning groove 642. Preferably, the positioning groove 642 is rectangular. Correspondingly, the first positioning seat 500 is provided with a positioning protrusion 520 that interlocks with the positioning groove 642. When the battery module assembly 200 is installed in place, the positioning protrusion 520 is inserted into the positioning groove 642, realizing the pre-positioning and anti-rotation limiting of the second limiting structure 600 in the horizontal direction. This interlocking not only improves the alignment accuracy of the second fixing hole 641 and the first positioning hole 510 during assembly, but also enhances the overall structure's resistance to shear and vibration under dynamic loads.

[0051] Furthermore, multiple snap-fit ​​slots 211 are provided, spaced apart along the length of the battery module body 210. Multiple second limiting structures 600 are correspondingly provided, forming a multi-point support and multi-point fixing structure. This design effectively disperses stress concentration in the connection area, improves the overall structural stability of the battery module assembly 200 under dynamic loads such as vibration and impact, and prevents connection failure due to local deformation.

[0052] Furthermore, a rectangular buffer 212 is provided between each snap-fit ​​slot 211 and the second limiting part 620 of the second limiting structure 600 to achieve an elastic transition connection. This design not only absorbs dimensional tolerances during assembly, ensuring that the second limiting structure 600 snaps into place smoothly, but also effectively buffers vibration and impact during battery pack operation, reduces rigid contact stress between metal parts, mitigates fatigue damage, and extends the service life of the connection structure.

[0053] Preferably, the buffer 212 is made of foam or rubber and is bonded to the snap-fit ​​groove 211.

[0054] To ensure reliable installation and precise positioning of the BMS component 300, a mounting plate 800 is also provided in this embodiment. The mounting plate 800 is rectangular and located on the side of the second limiting structure 600 opposite to the battery module component 200, and has a through-hole circular fourth positioning hole 810. Correspondingly, the second limiting part 620 of the second limiting structure 600 has a vertically arranged positioning post 621 facing the mounting plate 800. The positioning post 621 and the fourth positioning hole 810 form an interlocking fit during assembly. When the mounting plate 800 is in place, the positioning post 621 inserts into the fourth positioning hole 810, effectively restricting the horizontal translational freedom of the mounting plate 800, achieving rapid positioning, guiding alignment, and preventing incorrect installation, significantly improving assembly efficiency and consistency.

[0055] Furthermore, the mounting plate 800 has at least one circular third fixing hole 820 extending vertically through its periphery. Preferably, multiple holes are provided and distributed at different corners of the mounting plate 800 to improve connection stability. A third positioning seat 900 is also provided in the corresponding receiving groove 111. This third positioning seat 900 extends vertically along the direction close to the mounting plate 800, and has a third positioning hole 910. Preferably, the third positioning hole 910 is a threaded hole, which can be directly engaged with a screw or bolt for locking, without the need for an additional nut.

[0056] After the mounting plate 800 is pre-positioned with the fourth positioning hole 810 via the positioning post 621, the third fixing hole 820 and the third positioning hole 910 on the third positioning seat 900 are automatically aligned. By inserting fasteners (such as screws) into the third fixing hole 820 and screwing them into the third positioning hole 910, the mounting plate 800 can be finally fixed, ensuring that it is reliably constrained in both the vertical and horizontal directions, resulting in a firm and reliable overall connection.

[0057] Furthermore, the mounting plate 800 has multiple vertically arranged support columns 830 on the side facing the BMS component 300, and each support column 830 has an internally threaded hole. The BMS component 300 is detachably mounted on the side of the mounting plate 800 opposite to the second limiting structure 600. During installation, fasteners are sequentially passed through the mounting holes 310 on the BMS component 300 and then screwed into the internally threaded holes of the support columns 830, achieving reliable fixation between the BMS component 300 and the mounting plate 800. This connection method eliminates the need for additional nuts, simplifies assembly, ensures a secure connection, and effectively prevents fasteners from falling off.

[0058] In this embodiment, the outer walls on both sides of the housing 100 are also provided with handle grooves 112 that are recessed from the outside in and extend horizontally, so as to facilitate the gripping of operators or automated equipment, significantly improving the ease of operation and ergonomics of the battery pack during assembly, handling and replacement. Furthermore, the straight-line distance between the bottoms of the two handle grooves 112 is adapted to the length of the battery module assembly 200. This design allows the handle grooves 112 to, to a certain extent, limit the lateral displacement of the battery module assembly 200.

[0059] Furthermore, at least one handle groove 112 is provided with a test hole 113 communicating with the interior of the housing 100. The test hole 113 is used for airtightness testing during the battery pack production process, and a vent valve 114 is detachably installed on the test hole 113. During the airtightness test, the vent valve 114 can be temporarily removed to connect the airtightness testing equipment.

[0060] After completing the airtightness test, the vent valve 114 is reinstalled onto the test port 113, restoring it to its normal operating state. This vent valve 114 responds to temperature changes in the cells caused by charge-discharge cycles during battery pack operation. When the internal gas undergoes volume changes due to thermal expansion and contraction, creating a "breathing effect," the vent valve 114 automatically opens or adjusts the ventilation volume to promptly release or compensate for pressure, effectively balancing the pressure difference between the inside and outside of the housing 100. This prevents deformation of the housing 100, seal failure, or unexpected opening of the main safety valve due to pressure buildup.

Claims

1. A battery pack, characterized in that, include: The housing (100) has a receiving groove (111), and the receiving groove (111) is provided with a first limiting structure (400) and a first positioning seat (500), and the first positioning seat (500) is provided with a first positioning hole (510). A battery module assembly (200) is detachably disposed in the receiving groove (111) and abuts against the first limiting structure (400). The battery module assembly (200) is provided with a second limiting structure (600) and a second fixing hole (641). When the first limiting structure (400) abuts against the battery module assembly (200), it can restrict the degree of freedom of the battery module assembly (200) in the horizontal direction and align the second fixing hole (641) with the first positioning hole (510).

2. The battery pack according to claim 1, characterized in that, The first limiting structure (400) is provided in two sets, which are detachably provided on both sides of the receiving groove (111) and are lower than the height of the battery module assembly (200). The straight distance between the two sets of the first limiting structure (400) is adapted to the length or width of the battery module assembly (200).

3. A battery pack according to claim 2, characterized in that, The receiving groove (111) has a second positioning seat (700) on each of its two short sides. The second positioning seat (700) has a second positioning hole (710). The first limiting structure (400) has a first fixing hole (410) that penetrates itself. The first fixing hole (410) and the second positioning hole (710) are connected by fasteners.

4. A battery pack according to claim 1, characterized in that, The battery module assembly (200) has an upward-facing snap-fit ​​groove (211) on one side. The second limiting structure (600) is detachably snapped into the snap-fit ​​groove (211) and contacts at least two different sides of the battery module assembly (200). The second fixing hole (641) is located at one end of the second limiting structure (600) near the receiving groove (111) and is connected to the first positioning hole (510) by a fastener. After the second fixing hole (641) is connected to the first positioning hole (510), it can restrict the movement of the battery module assembly (200).

5. A battery pack according to claim 4, characterized in that, The second limiting structure (600) includes a first limiting part (610), a second limiting part (620), and a third limiting part (630) connected vertically in sequence. The second limiting part (620) is engaged in the snap-fit ​​groove (211). The first limiting part (610) and the third limiting part (630) respectively contact different sides of the battery module assembly (200), and each of them has a horizontally arranged fixing edge (640) at the end away from the second limiting part (620). The second fixing hole (641) is provided on the fixing edge (640) and penetrates the fixing edge (640). The fixing edge (640) is also provided with a positioning groove (642) that penetrates itself. The first positioning seat (500) is provided with a positioning protrusion (520) that forms an insertion fit with the positioning groove (642).

6. A battery pack according to claim 4, characterized in that, Multiple slots (211) are provided and are arranged at intervals along the length direction of the battery module assembly (200). Multiple second limiting structures (600) are provided accordingly, and a buffer (212) is provided between each slot (211) and the second limiting part (620).

7. A battery pack according to claim 1, characterized in that, The device includes a mounting plate (800) for mounting a BMS component (300). The mounting plate (800) is located on the side of the second limiting structure (600) away from the battery module component (200). The mounting plate (800) has a fourth positioning hole (810) that penetrates through it. The second limiting structure (600) has a positioning post (621) on the side facing the mounting plate (800). The positioning post (621) and the fourth positioning hole (810) are interlocked, and the positioning post (621) can restrict the degree of freedom of the mounting plate (800) in the horizontal direction.

8. A battery pack according to claim 7, characterized in that, The receiving groove (111) is also provided with a third positioning seat (900), the third positioning seat (900) is provided with a third positioning hole (910), and the mounting plate (800) is provided with a third fixing hole (820) that penetrates itself; when the positioning post (621) is inserted into the fourth positioning hole (810), the third positioning hole (910) is aligned with the third fixing hole (820) and connected by fasteners.

9. A battery pack according to claim 1, characterized in that, The battery module assembly (200) includes a battery module body (210) and a protective shell (220). The protective shell (220) is made of metal and has an opening on the top side. The battery module body (210) is detachably placed inside the protective shell (220), and the height of the battery module body (210) is adapted to the height of the protective shell (220).

10. A battery pack according to claim 1, characterized in that, The outer walls on both sides of the housing (100) are also provided with handle grooves (112) that are recessed from the outside to the inside. The straight distance between the bottoms of the two handle grooves (112) is adapted to the length of the battery module assembly (200). At least one of the handle grooves (112) is provided with a test hole (113) that communicates with the inside of the housing (100). A vent valve (114) is detachably provided on the test hole (113).

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