A stackable battery pack

Abstract

The utility model relates to battery technology field discloses a kind of stackable battery packs, including shell, the shell one side is equipped with the first connector that projects outward, the other side is equipped with the second connector that is recessed inward;Battery module, the battery module includes a plurality of be arranged in the shell and be matrix arrangement electric core, the battery module is close to the recess of second connector side, the recess is formed by interrupting the continuous arrangement of electric core, and the recess and the second connector form concave-convex cooperation;When two battery packs are stacked, the first connector of lower layer battery pack and the second connector of upper layer battery pack form plug-in cooperation, and make two battery packs form electric connection.The utility model has the beneficial effect that it is easy to assemble and compact in structure.

Description

Technical Field

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

[0002] With the development of modular energy storage systems, stackable battery packs are widely used in portable devices, home energy storage, and industrial backup power due to their rapid capacity expansion capabilities. In existing technologies, to achieve mechanical docking and electrical interconnection between multiple battery packs, a structural design is often adopted with complementary connectors on opposite sides of the battery pack casing. For example, one side has a protruding plug, and the other side has a matching recessed socket. When multiple battery packs are stacked vertically or linearly, the plug of the lower battery pack is inserted into the socket of the upper battery pack, thus achieving simultaneous mechanical fixing and electrical connection, improving assembly efficiency. However, to accommodate the connectors and their docking space, the battery pack must have sufficient structural margin in the horizontal direction, resulting in an increased overall size, especially in the length or width directions, forming "redundant borders," which is detrimental to the design of thinner and smaller battery packs. In space-constrained applications, this structure is difficult to adapt to compact installation environments. 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 stackable battery pack that is easy to assemble and has a compact structure.

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

[0005] The housing has a first connector protruding outward on one side and a second connector recessed inward on the other side;

[0006] The battery module includes a plurality of battery cells arranged in a matrix within the housing. The battery module has a groove on the side near the second connector. The groove is formed by interrupting the continuous arrangement of the battery cells, and the groove forms a concave-convex fit with the second connector. When two battery packs are stacked, the first connector of the lower battery pack and the second connector of the upper battery pack form a plug-in fit, thereby electrically connecting the two battery packs.

[0007] In the aforementioned stackable battery pack, both the first connector and the second connector are located on the centerline of the housing, the groove is located on the centerline of the battery module, and the centerline of the housing coincides with the centerline of the battery module.

[0008] In the aforementioned stackable battery pack, one side of the housing is provided with a first mounting seat that communicates with the interior of the housing and protrudes from the exterior of the housing. The first connector is detachably connected to the first mounting seat and electrically connected to the battery module. The other side of the housing is provided with a second mounting seat that communicates with the interior of the housing and is recessed into the interior of the housing. The second connector is detachably connected to the second mounting seat and electrically connected to the battery module.

[0009] In the aforementioned stackable battery pack, the first mounting base includes a first guide portion and a first mounting portion. The first guide portion is arranged circumferentially along the first connector, and the first mounting portion is arranged horizontally within the first guide portion and connected to the inner wall of the first guide portion. The first mounting portion has a first opening for the first connector to pass through. The second mounting base includes a second guide portion and a second mounting portion. The second guide portion is arranged circumferentially along the second connector, and the second mounting portion is arranged horizontally within the second guide portion and connected to the inner wall of the second guide portion. The second mounting portion has a second opening for the second connector to pass through.

[0010] In the aforementioned stackable battery pack, the cross-sectional area of ​​the first guide portion gradually decreases along the convex direction, the cross-sectional area of ​​the second guide portion gradually decreases along the concave direction, and a plurality of reinforcing plates are provided on the outer side of the second guide portion. The reinforcing plates are located on the side of the housing away from the battery module and are perpendicularly connected to the housing and the second guide portion, respectively.

[0011] In the aforementioned stackable battery pack, one side of the housing is provided with two sets of first stacking structures arranged vertically along the battery pack stacking direction and arranged in a left-right structure along the length of the housing, and the other side is provided with two sets of second stacking structures arranged vertically along the battery pack stacking direction and arranged in a left-right structure along the length of the housing; when two battery packs are stacked, the first stacking structure of the upper battery pack and the second stacking structure of the lower battery pack form an interlocking fit.

[0012] In the aforementioned stackable battery pack, the first stacking structure protrudes from the surface of the housing in a direction away from the housing, the second stacking structure is recessed from the surface of the housing in a direction closer to the interior of the housing, and the first stacking structure is provided with a handle hole that penetrates itself in a horizontal direction.

[0013] In the aforementioned stackable battery pack, a vertically arranged reinforcing part is provided inside the handle hole. One end of the reinforcing part is connected to the inner wall of the handle hole, and the other end is connected to the surface of the housing.

[0014] In the aforementioned stackable battery pack, the reinforcing part is provided with a first locking hole that penetrates itself in a horizontal direction, and one side of the housing is provided with a second locking hole that communicates with the second stacking structure in a horizontal direction; when two battery packs are stacked, the second locking hole of the upper battery pack is aligned with the first locking hole of the lower battery pack.

[0015] In the aforementioned stackable battery pack, one side of the housing is provided with a positioning groove extending along the length of the housing and recessed into the housing in a vertical direction, and the other side of the housing is provided with a positioning protrusion extending along the length of the housing and protruding outward in a vertical direction. The positioning groove has a first guide surface that is inclined outward on both sides, and the positioning protrusion has a second guide surface that is inclined outward on both sides.

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

[0017] 1. In this invention, by interrupting the continuous arrangement of battery cells on the side of the battery module near the second connector, a groove adapted to the inwardly recessed second connector is formed, allowing the second connector to be embedded into the internal space of the battery module. This achieves a high degree of integration and reuse of the connector mounting space and the battery cell layout area. This design effectively avoids adding extra housing volume to the connector, thereby significantly reducing the overall volume of the battery pack and improving space utilization.

[0018] 2. In this utility model, the cross-sectional area of ​​the first guide portion gradually decreases along the convex direction, and the cross-sectional area of ​​the second guide portion also gradually decreases along the concave direction. The two complement each other, which is beneficial to the automatic alignment and smooth insertion of the connector during the stacking process. At the same time, multiple reinforcing plates are provided on the outer side of the second guide portion. The reinforcing plates are located on the side of the housing away from the battery cell and are perpendicularly connected to the housing and the second guide portion respectively. This can effectively enhance the structural rigidity and deformation resistance of the second mounting area on the housing, and prevent interference between the second connector and the groove on the battery module caused by the force on the housing during insertion or use, thereby ensuring the reliability and long-term durability of the electrical connection.

[0019] 3. In this utility model, a first stacking structure is provided on one side of the housing, arranged vertically along the stacking direction and horizontally along the length of the housing. Two sets of second stacking structures are correspondingly provided on the other side. When two battery packs are stacked, the upper first stacking structure and the lower second stacking structure form a plug-in fit. This design enables the mechanical stacking structure and connector to work together, achieving dual positioning and limiting functions between battery packs. This not only significantly improves the alignment accuracy and assembly efficiency during the stacking process but also effectively distributes the mechanical load borne by the connector, avoiding interface wear or damage due to stress concentration. This significantly improves the reliability of the connection, structural stability, and vibration and impact resistance. Attached Figure Description

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

[0021] Figure 2 This is a structural schematic diagram of a stackable battery pack according to this utility model from another perspective.

[0022] Figure 3 This is an exploded view of a stackable battery pack according to the present invention.

[0023] Figure 4 for Figure 3 A structural diagram from another perspective.

[0024] Figure 5 This is a cross-sectional view of the battery pack of this utility model in a stacked state.

[0025] Figure 6 for Figure 5 Cross-sectional view at point A in the middle.

[0026] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0027] 100. Housing; 101. Top cover; 102. Bottom housing; 110. First mounting base; 111. First guide portion; 112. First mounting portion; 113. First opening; 120. Second mounting base; 121. Second guide portion; 122. Second mounting portion; 123. Second opening; 130. Reinforcing plate; 140. Second locking hole; 150. Positioning groove; 151. First guide surface; 160. Positioning protrusion; 161. Second guide surface; 200. First connector; 300. Second connector; 400. Battery module; 410. Battery cell; 420. Groove; 500. First stacking structure; 510. Handle hole; 520. Reinforcing portion; 521. First locking hole; 600. Second stacking structure; 700. BMS assembly. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figures 1 to 6 As shown, in this embodiment, a stackable battery pack includes:

[0034] The housing 100 has a first connector 200 protruding outward on one side and a second connector 300 recessed inward on the other side.

[0035] The battery module 400 includes a plurality of battery cells 410 arranged in a matrix within a housing 100. The battery module 400 has a groove 420 near the second connector 300, formed by interrupting the continuous arrangement of the battery cells 410, and the groove 420 forms a concave-convex fit with the second connector 300. When two battery packs are stacked, the first connector 200 of the lower battery pack and the second connector 300 of the upper battery pack form a plug-in fit, electrically connecting the two battery packs. This design achieves a high degree of integration and reuse of the connector installation space and the battery cell 410 layout area, effectively avoiding the need to add extra volume to the housing 100 for the connectors, thereby significantly reducing the overall volume of the battery pack and improving space utilization.

[0036] Specifically, such as Figures 1 to 6As shown, in this embodiment, the battery pack includes a housing 100 and a battery module 400 and a BMS assembly 700 (battery management system) disposed inside the housing 100. The housing 100 is formed by connecting the upper cover 101 and the lower cover 102, forming a rectangular receiving space inside for installing the battery module 400 and the BMS assembly 700.

[0037] Furthermore, the upper cover 101 and the lower shell 102 can be fixed and sealed by screws, clips, or sealant to ensure the internal environment is waterproof, dustproof, and has good insulation safety. The shell 100 is made of high-strength engineering plastics or metal materials, possessing good mechanical strength and heat dissipation performance.

[0038] To achieve electrical parallel or series connection between two adjacent battery packs, in this embodiment, a first connector 200 protruding outward is provided on one side of the housing 100, and a second connector 300 recessed inward is provided on the opposite side. The first connector 200 is used to engage with the second connector 300 of another identical battery pack, thereby completing the electrical connection during the stacking process.

[0039] Furthermore, both the first connector 200 and the second connector 300 are electrical connection interfaces that can be used to transmit power and communication signals. Their types can be configured according to actual application requirements, such as high-voltage DC plugs, integrated interfaces with communication functions, etc., to meet the needs of different application scenarios.

[0040] Furthermore, the first connector 200 is disposed on the surface of the upper cover 101 and electrically connected to the battery module 400, and the second connector 300 is disposed on the bottom of the lower shell 102 and electrically connected to the battery module 400, with both the first connector 200 and the second connector 300 located on the centerline of the shell 100. This design avoids problems such as uneven force distribution during stacking, difficulty in connector insertion, or torsional stress caused by eccentric arrangement, thereby ensuring the reliability of electrical contact and the stability of the structure.

[0041] To improve the ease of disassembly, assembly, and maintenance of the first connector 200 and the second connector 300, in this embodiment, the upper cover 101 of the housing 100 is provided with a first mounting seat 110 that communicates with the interior of the housing 100 and protrudes from the exterior of the housing 100, and the lower shell 102 of the housing 100 is provided with a second mounting seat 120 that communicates with the interior of the housing 100 and is recessed into the interior of the housing 100. The first connector 200 is detachably connected to the first mounting seat 110, and the second connector 300 is detachably connected to the second mounting seat 120. The detachable connection can be achieved through fastener connection or snap-fit ​​connection. This design allows for seamless connection of the connectors without requiring complete disassembly of the battery pack or replacement of the entire unit when wear, damage, or interface type change is needed. This significantly improves maintenance efficiency and product maintainability, while also supporting flexible configuration of communication protocols or electrical interfaces according to different application scenarios.

[0042] Furthermore, the first mounting base 110 includes a first guide portion 111 and a first mounting portion 112. The first guide portion 111 is arranged circumferentially along the first connector 200 and extends away from the housing 100 to protect the first connector 200 from water splashing onto it, thereby improving its safety and reliability in complex environments.

[0043] Furthermore, the first guide portion 111 is a hollow trapezoidal protrusion structure, with its cross-sectional area gradually decreasing along the protruding direction to form an outwardly recessed profile. This design can automatically guide and align the insertion of the second connector 300, reduce insertion resistance, and improve assembly smoothness.

[0044] Furthermore, the first mounting portion 112 is horizontally arranged within the first guide portion 111 and is fixedly connected to the inner wall of the first guide portion 111 to support the first connector 200. The first mounting portion 112 has a rectangular first opening 113 for the first connector 200 to pass through. The first connector 200 passes through the first opening 113 and is fixed to the first mounting portion 112 by fasteners (screws or bolts). This design not only facilitates the quick installation and replacement of the connector but also ensures its stability during use.

[0045] Furthermore, the second mounting base 120 includes a second guide portion 121 and a second mounting portion 122. The second guide portion 121 is arranged circumferentially along the second connector 300 and extends recessed into the housing 100. Its cross-sectional area gradually decreases along the recessed direction to form an inward profile, and it complements the first guide portion 111 to guide the first connector 200 to smoothly enter during the insertion process, avoiding misalignment or jamming.

[0046] Furthermore, the second mounting portion 122 is horizontally arranged within the second guide portion 121 and is fixedly connected to the inner wall of the second guide portion 121 to support the second connector 300. The second mounting portion 122 has a rectangular second opening 123 for the second connector 300 to pass through. The second connector 300 passes through the second opening 123 and is fixed to the second mounting portion 122 by fasteners. This design facilitates quick installation and replacement of the connector while ensuring its stability during use.

[0047] Furthermore, multiple reinforcing plates 130 are provided on the outer side of the second guide portion 121. These reinforcing plates 130 are located on the side of the lower shell 102 opposite to the battery module 400 and are vertically connected to the shell 100 and the second guide portion 121, respectively. This design effectively enhances the structural rigidity and deformation resistance of the area of ​​the second mounting base 120 on the shell 100, preventing interference between the second connector 300 and the groove 420 on the battery module 400 due to stress on the shell 100 during insertion or use, thereby ensuring the reliability and long-term durability of the electrical connection.

[0048] To further enhance mechanical stability and ease of operation during the stacking process, two sets of first stacking structures 500 are vertically arranged along the stacking direction on one side of the housing 100, and two sets of compatible second stacking structures 600 are correspondingly provided on the other side. The two sets of first stacking structures 500 and second stacking structures 600 are respectively arranged along the length direction of the housing 100 (see...). Figure 1 The components (in the direction indicated by the middle arrow) are symmetrically distributed. When two battery packs are stacked, the first stacking structure 500 of the upper battery pack is inserted into the second stacking structure 600 of the lower battery pack, achieving mechanical positioning and resistance to lateral slippage. This design enables the mechanical stacking structure and connectors to work together, achieving dual positioning and positioning functions between battery packs. On the one hand, the stacking structure achieves coarse positioning and resistance to lateral displacement; on the other hand, the center-aligned connectors complete precise positioning. This not only significantly improves the alignment accuracy and assembly efficiency of the stacking process, but also effectively distributes the mechanical load borne by the connectors, avoiding interface wear or damage due to stress concentration, thereby significantly improving the reliability of the connection, structural stability, and resistance to vibration and impact.

[0049] Furthermore, the first stacking structure 500 is trapezoidal, located on the surface of the upper cover 101, and protrudes from the surface of the upper cover 101 in a direction away from the housing 100. This trapezoidal structure has good mechanical load-bearing performance, effectively transmitting stacking pressure and resisting lateral slippage. Simultaneously, the first stacking structure 500 is provided with a horizontally penetrating handle hole 510, allowing users to insert their fingers or tools into the hole for lifting operations, facilitating the handling, disassembly, and stacking adjustment of the battery pack. This design achieves a composite of structural functions, enabling the first stacking structure 500 to combine mechanical limiting, guiding alignment, and human-machine operation assistance functions, improving the product's practicality and user experience.

[0050] Furthermore, a vertically arranged reinforcing part 520 is provided inside the handle hole 510. One end of the reinforcing part 520 is perpendicularly connected to the inner wall of the handle hole 510, and the other end is perpendicularly connected to the surface of the upper cover 101 of the housing 100, dividing the handle hole 510 in two along its length to form a symmetrical double-hole structure. This design not only effectively improves the overall rigidity and bending strength of the first stacked structure 500, preventing deformation or cracking of the handle area due to concentrated force during handling or disassembly, but also achieves local reinforcement through integrated structural design, meeting mechanical performance requirements without the need to increase material thickness, which is beneficial for lightweighting and space optimization.

[0051] Furthermore, the reinforcing part 520 is provided with a first locking hole 521 that extends horizontally through itself, and the bottom of the lower shell 102 of the housing 100 is provided with a second locking hole 140 that communicates horizontally with the second stacking structure 600; when the two battery packs are stacked, the second locking hole 140 of the upper battery pack is aligned with the first locking hole 521 of the lower battery pack. At this time, the user can mechanically lock the upper and lower battery packs by inserting bolts, pins or other fasteners to prevent accidental detachment during transportation, vibration or tilting conditions, significantly improving the safety and reliability of the stacking system.

[0052] Furthermore, the second stacking structure 600 is also trapezoidal, located at the bottom of the lower shell 102, and recessed from the bottom surface of the lower shell 102 toward the interior of the shell 100. Its shape and size are adapted to the first stacking structure 500 to achieve a plug-in fit. When the upper battery pack is stacked downwards, the first stacking structure 500 slides in along the inner wall of the second stacking structure 600.

[0053] In this embodiment, one side of the housing 100 is further provided with a section along the length direction of the housing 100 (see...). Figure 1 A rectangular positioning groove 150 extends vertically into the housing 100 (as indicated by the middle arrow) and is recessed into the housing 100. On the other side, a groove is also provided along the length of the housing 100 (see...). Figure 1A rectangular positioning protrusion 160 extends vertically outward from the housing 100, extending in the direction indicated by the middle arrow. When two battery packs are stacked, the positioning protrusion 160 of the upper battery pack inserts into the positioning groove 150 of the lower battery pack, forming a concave-convex fit, ultimately achieving end-face contact and completing mechanical alignment. This design provides effective guidance and limiting functions in the initial stage of stacking operations, achieving rapid coarse positioning and significantly reducing the risk of misalignment, jamming, or interface scratches between the first connector 200 and the second connector 300 due to positional deviations.

[0054] Furthermore, a positioning groove 150 is disposed on the surface of the upper cover 101 of the housing 100, with its recessed direction facing the interior of the housing 100; a positioning protrusion 160 is disposed on the bottom surface of the lower housing 102, with its protruding direction facing the exterior of the housing 100. The positioning groove 150 has outwardly inclined first guide surfaces 151 on both sides, and the positioning protrusion 160 has outwardly inclined second guide surfaces 161 on both sides. This design forms a progressive guiding channel during the stacking process. When the upper battery pack falls or is pushed forward, even with slight lateral displacement, the inclined guide surfaces can generate lateral thrust to automatically correct the relative position, allowing the positioning protrusion 160 to smoothly slide into the positioning groove 150.

[0055] To further improve the overall performance of the battery pack, in this embodiment, the battery module 400 is composed of multiple battery cells 410 arranged in a matrix and fixed and isolated by the module frame to prevent short circuits and heat propagation. The multiple battery cells 410 can be lithium-ion, lithium iron phosphate, or other high-energy-density rechargeable battery units, and can be configured with appropriate series and parallel connections according to application requirements to achieve the target voltage and capacity.

[0056] Furthermore, the battery module 400 has a groove 420 near the second connector 300, which is formed by interrupting the continuous arrangement of the battery cells 410. Specifically, in the originally regularly arranged matrix of battery cells 410, a specific space is reserved in the area near the second connector 300, for example, by removing several battery cells 410 from the left, right, or middle position of the front row. Preferably, two battery cells 410 in the middle position are removed, thereby forming a rectangular or trapezoidal groove 420 that matches the shape of the second connector 300. The position and size of the groove 420 correspond to the inwardly recessed second connector 300, and the two form a concave-convex fit relationship in space. This design allows the second connector 300 to be partially embedded in the internal area of ​​the battery module 400, making full use of the "gap space" in the battery cell 410 layout, achieving a high degree of integration and reuse of structural space, effectively avoiding the need to increase the thickness of the housing 100 or the overall volume to accommodate the connector, which helps to reduce the external size of the battery pack and improve volume utilization and energy density.

[0057] Furthermore, the groove 420 is located on the centerline of the battery module 400, and the centerline of the battery module 400 coincides with the centerline of the housing 100. That is, the geometric center of the battery module 400 is consistent with the structural center of the housing 100, avoiding uneven mass distribution or local stress concentration caused by eccentric arrangement. On this basis, a multi-element center-aligned structural system of "groove 420 - battery module 400 - housing 100 - connector" is formed, realizing the unified coordination of mechanical structure, electrical interface and spatial layout.

Claims

1. A stackable battery pack, characterized in that, include: A housing (100) has a first connector (200) protruding outward on one side and a second connector (300) recessed inward on the other side; A battery module (400) includes a plurality of battery cells (410) arranged in a matrix within the housing (100). The battery module (400) has a groove (420) on the side near the second connector (300). The groove (420) is formed by interrupting the continuous arrangement of the battery cells (410), and the groove (420) forms a concave-convex fit with the second connector (300). When two battery packs are stacked, the first connector (200) of the lower battery pack and the second connector (300) of the upper battery pack form a plug-in fit, and the two battery packs are electrically connected.

2. The stackable battery pack according to claim 1, characterized in that, The first connector (200) and the second connector (300) are both located on the center line of the housing (100), the groove (420) is located on the center line of the battery module (400), and the center line of the housing (100) coincides with the center line of the battery module (400).

3. A stackable battery pack according to claim 1, characterized in that, The housing (100) has a first mounting base (110) on one side that communicates with the interior of the housing (100) and protrudes from the exterior of the housing (100). The first connector (200) is detachably connected to the first mounting base (110) and electrically connected to the battery module (400). The housing (100) has a second mounting base (120) on the other side that communicates with the interior of the housing (100) and is recessed into the interior of the housing (100). The second connector (300) is detachably connected to the second mounting base (120) and electrically connected to the battery module (400).

4. A stackable battery pack according to claim 3, characterized in that, The first mounting base (110) includes a first guide portion (111) and a first mounting portion (112). The first guide portion (111) is arranged circumferentially along the first connector (200). The first mounting portion (112) is arranged horizontally within the first guide portion (111) and connected to the inner wall of the first guide portion (111). The first mounting portion (112) is provided with a first opening (113) for the first connector (200) to pass through. The second mounting base (120) includes a second guide portion (121) and a second mounting portion (122). The second guide portion (121) is arranged circumferentially along the second connector (300). The second mounting portion (122) is arranged horizontally within the second guide portion (121) and connected to the inner wall of the second guide portion (121). The second mounting portion (122) is provided with a second opening (123) for the second connector (300) to pass through.

5. A stackable battery pack according to claim 4, characterized in that, The cross-sectional area of ​​the first guide portion (111) gradually decreases along the protruding direction, and the cross-sectional area of ​​the second guide portion (121) gradually decreases along the concave direction. Furthermore, a plurality of reinforcing plates (130) are provided on the outer side of the second guide portion (121). The reinforcing plates (130) are located on the side of the housing (100) away from the battery module (400) and are perpendicularly connected to the housing (100) and the second guide portion (121) respectively.

6. A stackable battery pack according to claim 1, characterized in that, The housing (100) is provided with two sets of first stacking structures (500) arranged vertically along the stacking direction of the battery pack and arranged in a left-right structure along the length direction of the housing (100) on one side, and two sets of second stacking structures (600) arranged vertically along the stacking direction of the battery pack and arranged in a left-right structure along the length direction of the housing (100) on the other side; when two battery packs are stacked, the first stacking structure (500) of the upper battery pack and the second stacking structure (600) of the lower battery pack form a plug-in fit.

7. A stackable battery pack according to claim 6, characterized in that, The first stacked structure (500) protrudes from the surface of the housing (100) in a direction away from the housing (100), and the second stacked structure (600) is recessed from the surface of the housing (100) in a direction closer to the interior of the housing (100). The first stacked structure (500) is provided with a handle hole (510) that penetrates itself in a horizontal direction.

8. A stackable battery pack according to claim 7, characterized in that, The handle hole (510) is provided with a vertically arranged reinforcing part (520), one end of which is connected to the inner wall of the handle hole (510) and the other end is connected to the surface of the housing (100).

9. A stackable battery pack according to claim 8, characterized in that, The reinforcing part (520) is provided with a first locking hole (521) that penetrates itself in the horizontal direction, and the housing (100) is provided with a second locking hole (140) that communicates with the second stacking structure (600) in the horizontal direction on one side; when the two battery packs are stacked, the second locking hole (140) of the upper battery pack is aligned with the first locking hole (521) of the lower battery pack.

10. A stackable battery pack according to claim 1, characterized in that, The housing (100) is provided with a positioning groove (150) extending along the length of the housing (100) and recessed into the housing (100) in a vertical direction on one side. The housing (100) is provided with a positioning protrusion (160) extending along the length of the housing (100) and protruding outward in a vertical direction on the other side. The positioning groove (150) has a first guide surface (151) inclined outward on both sides, and the positioning protrusion (160) has a second guide surface (161) inclined outward on both sides.

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