Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack. The battery pack comprises a shell and a BDU unit, a battery pack and expansion beams are arranged in the shell, the battery pack comprises single battery cells arranged in the first direction, the expansion beams are attached to the two ends of the battery pack in the first direction, and the expansion beams generate elastic deformation in the first direction at least when the single battery cells expand; the BDU is located between the expansion beam and the shell and comprises a fixing frame, a BDU body and a fastener, the fixing frame is fixedly connected to the expansion beam, a sliding part is arranged on the BDU body, and the fastener is fixedly connected to the fixing frame and can be arranged on the sliding part in a sliding mode in the first direction. According to the battery pack, when the expansion beam elastically deforms, the fastener can slide on the sliding part, so that the displacement amount of the fixing frame when the expansion beam expands and deforms is absorbed through the sliding part, the situation that the BDU body moves and is extruded to deform is avoided, the use safety of the BDU body is improved, and the design and manufacturing complexity of the battery pack is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] BDU (Battery Disconnect Unit) is an important component of the internal design of the battery pack and is often used as a distribution box. When the battery pack system reports an error, the BDU can cut off the internal current of the power battery to ensure system safety. In the existing battery pack design, the fixed bracket connected to the BDU base is usually welded to the expansion beam inside the battery pack shell. When the battery pack in the battery pack expands, it will cause the expansion beam to bend and deform, and drive the fixed bracket and BDU to move together. The BDU is squeezed by the expansion beam and the battery pack shell at the same time, causing the BDU shell to deform, affecting its service life.

[0003] At present, the existing technology often adopts the method of thickening the expansion beam to increase the strength of the expansion beam, or adding a cross beam (i.e., a beam horizontally and perpendicular to the extension direction of the expansion beam) to slow down the expansion force generated by the expansion of the battery pack. However, the above two methods will take up additional space for other components in the battery pack shell, making the battery pack design and layout process complicated.

[0004] Therefore, there is an urgent need for a battery pack to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of the present utility model is to provide a battery pack to solve the technical problem in the prior art that it is necessary to thicken the expansion beam or add a cross beam in the battery pack shell, which increases the space occupied by other components in the battery pack shell and affects the design and production of the battery pack.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A battery pack has a first direction and a second direction, the first direction being perpendicular to the second direction, the battery pack comprising:

[0008] a housing, wherein a housing is provided with a housing cavity, wherein a battery pack and an expansion beam are provided in the housing cavity, wherein the battery pack includes a plurality of single cells, wherein the plurality of single cells are arranged in sequence along the first direction, and wherein an expansion beam is attached to each end of the battery pack along the first direction, wherein the expansion beam generates elastic deformation along the first direction at least when the single cell expands;

[0009] A BDU unit is arranged in the accommodating cavity and is located between the expansion beam and the shell. The BDU unit includes a fixing frame, a BDU body and a fastener. The fixing frame is fixedly connected to the expansion beam. A sliding portion is provided on the BDU body. The fastener is fixedly connected to the fixing frame and can be slidably arranged on the sliding portion along the first direction.

[0010] Preferably, along the second direction, a mounting waist-shaped hole for forming the sliding part is provided through the BDU body, and the length direction of the mounting waist-shaped hole is parallel to the first direction, the fastener is passed through the mounting waist-shaped hole and fixedly connected to the fixing frame, and the fastener can be slidably provided in the mounting waist-shaped hole.

[0011] Preferably, the fastener includes a locking bolt and a rivet nut, the rivet nut is provided on the fixing frame, the locking bolt is passed through the mounting waist hole and is connected to the rivet nut, and the rivet nut includes a first flange, which is clamped between the BDU body and the fixing frame.

[0012] Preferably, the fastener further comprises a first screw sleeve, the first screw sleeve comprising a screw sleeve body and a second flange, the screw sleeve body being embedded in the mounting waist-shaped hole, and the second flange being arranged at the end of the screw sleeve body and abutting against the BDU body;

[0013] The locking bolt includes a stud body and a third flange. The stud body is passed through the nut body and connected to the rivet nut. The third flange is arranged on the outer periphery of the stud body and abuts against the second flange.

[0014] Preferably, a first avoidance chamfer is provided at the connection between the screw sleeve body and the second flange, a second avoidance chamfer is provided at the opening of the mounting waist-shaped hole facing the second flange, and the first avoidance chamfer is arranged relative to the second avoidance chamfer.

[0015] Preferably, one end of the screw sleeve body away from the second flange is flush with the opening of the mounting waist-shaped hole and is connected to the first flange to support the first screw sleeve through the rivet nut.

[0016] Preferably, along the third direction, a plurality of the mounting waist-shaped holes are provided on the BDU body, a plurality of the fixing brackets are fixed on the expansion beam, each of the mounting waist-shaped holes is fixed to the fixing bracket by a fastener, the third direction is parallel to the length extension direction of the expansion beam, and the third direction, the second direction and the first direction are perpendicular to each other.

[0017] Preferably, the BDU body includes a base and an upper cover, the base is provided with an electrical component, the base is provided with the mounting waist-shaped hole, and the side wall of the base is provided with a boss;

[0018] The upper cover comprises an upper cover body and a clamping structure. The upper cover body is provided with the clamping structure, and the clamping structure has a clamping slot. When the upper cover body is buckled onto the base, the boss is clamped in the clamping slot.

[0019] Preferably, the base is further provided with a guide structure, and when the upper cover body is buckled onto the base, the guide structure can guide the card slot to be snapped onto the boss.

[0020] Preferably, at least two inner side walls of the upper cover body are provided with limit plates protruding downwards, and when the upper cover body is buckled onto the base, the two limit plates are respectively fitted and abutted against the inner side walls of the base.

[0021] Preferably, the snap-fit ​​structure includes a snap-fit ​​plate and a rib, the snap-fit ​​plate has the snap-fit ​​groove, and the opposite sides of the snap-fit ​​plate are each connected to the upper cover body through a rib to form an avoidance gap between the side wall of the snap-fit ​​plate and the upper cover body, and a pressing groove is provided between one end of the snap-fit ​​plate and the upper cover body, and the pressing groove is connected to the avoidance gap so that the snap-fit ​​plate can rotate around the rib.

[0022] Preferably, the end of the clamping structure facing the boss has a first chamfer, and the end of the boss facing the clamping structure has a second chamfer, and the first chamfer and the second chamfer are arranged opposite to each other.

[0023] The beneficial effects of this utility model include providing a sliding portion on the BDU body. When the expansion beam undergoes elastic deformation, the expansion beam slides on the sliding portion, carrying the fastener, without forcing the BDU body to move in the first direction, thereby maintaining the position of the BDU body. In other words, the sliding portion absorbs the displacement of the fixing bracket when the expansion beam expands and deforms, thereby preventing the BDU body from being squeezed and deformed due to movement. This improves the safety of the BDU body and does not occupy additional installation space for other components within the battery pack housing, preventing the overall design and manufacture of the battery pack from becoming complicated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the internal structure of the battery pack provided by an embodiment of the present utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3yes Figure 2 Cross-sectional view along the middle edge BB;

[0027] Figure 4 yes Figure 3 A partial enlarged view of point C in the middle;

[0028] Figure 5 This is a schematic structural diagram of a BDU unit provided by an embodiment of the present utility model;

[0029] Figure 6 This is an exploded diagram of the structure of the BDU unit provided by an embodiment of the present utility model;

[0030] Figure 7 yes Figure 6 A partial enlarged view of point D in the middle;

[0031] Figure 8 yes Figure 6 A partial enlarged view of point E in the middle.

[0032] In the picture:

[0033] 1. Housing; 2. BDU unit;

[0034] 11. Expansion beam; 12. Cross beam;

[0035] 21. Fixed frame;

[0036] 22. BDU body; 2201. Mounting waist hole; 2202. Mounting through hole; 221. Upper cover; 2211. Upper cover body; 2212. Snap-fit ​​structure; 22121. Snap-fit ​​groove; 22122. Snap-fit ​​plate; 22123. Rib; 22124. First chamfer; 2213. Avoidance gap; 2214. Pressing groove; 2215. Limiting plate; 222. Base; 2221. Boss; 22211. Second chamfer; 2222. Guide structure; 223. Electrical components;

[0037] 23. Fastener; 231. Locking bolt; 2311. Third flange; 232. Rivet nut; 2321. First flange; 233. First threaded sleeve; 2331. Threaded sleeve body; 2332. Second flange;

[0038] 24. Locking piece. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0043] The technical solution provided by the present invention is described below with reference to the accompanying drawings and specific embodiments.

[0044] It should be noted in advance that in the drawings of the embodiments of this application, a first direction is indicated by a double-headed arrow marked X, a second direction is indicated by a double-headed arrow marked Y, and a third direction is indicated by a double-headed arrow marked Z. In this embodiment, the first direction X corresponds to the thickness direction of the single cell. For a square single cell, the direction corresponding to its two large surfaces is the thickness direction, i.e., the first direction X; the second direction Y corresponds to the height direction of the single cell; and the third direction Z corresponds to the length direction of the single cell. In this embodiment, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0045] This embodiment provides a battery pack, which includes a shell 1 and an upper cover 221 that matches the shell 1. The shell 1 is provided with a receiving cavity, and the upper cover 221 is buckled on the shell 1 to seal the receiving cavity. Figure 1As shown, a battery pack and an expansion beam 11 are provided in the accommodating cavity. The battery pack includes a plurality of single cells arranged in sequence along a first direction, and an expansion beam 11 is attached to each end of the battery pack along the first direction. The length of the expansion beam 11 extends along a third direction, and its two ends are fixed to the inner wall of the outer shell 1. In this embodiment, the battery pack abandons the traditional module structure and instead forms a battery pack by arranging a plurality of single cells into groups. The battery pack is then directly placed in the accommodating cavity and shaped by the expansion beams 11 attached at both ends to prevent the battery pack from shaking. Thus, the battery pack can be directly grouped, which simplifies the assembly process of the battery pack, reduces the number of components used, reduces the volume and production cost of the battery pack, and improves the energy density of the battery pack.

[0046] In addition, during the charging and discharging process of a single battery cell, the single battery cell expands along the thickness direction, causing the overall size of the battery pack to expand to both sides along the first direction. After being squeezed, the expansion beam 11 can at least undergo elastic deformation along the first direction to provide space for the expansion of the single battery cell through elastic deformation.

[0047] It is understandable that more expansion beams 11 may be provided in the battery pack along the first direction, so that more assembly spaces for assembling battery packs can be defined by providing more expansion beams 11, thereby enabling more battery packs to be assembled.

[0048] Specifically, refer to Figure 2 As shown, the battery pack also includes a BDU unit 2 arranged in the accommodating cavity, and the BDU unit 2 is located between the outer shell 1 and one of the expansion beams 11 located at the edge. The BDU unit 2 includes a fixing frame 21, a BDU body 22 and a fastener 23. Among them, the fixing frame 21 is fixedly connected to the expansion beam 11, and the BDU body 22 is fixedly mounted on the fixing frame 21 by the fastener 23 to complete the installation of the BDU unit 2 in the battery pack. When a single battery cell expands, the expansion beam 11 will elastically deform along the first direction. At this time, the expansion beam 11 will move the entire BDU unit 2 forward, causing the BDU body 22 to be squeezed and deformed by the expansion beam 11 and the outer shell 1 at the same time, thereby affecting the service life. The commonly used solution at present is to thicken the expansion beam 11 or add a cross beam 12 (a beam that is horizontally and perpendicular to the length extension direction of the expansion beam 11) to slow down the expansion deformation of the battery pack. However, the above two methods will take up additional installation space for other components in the battery pack shell 1, and still cannot completely eliminate the phenomenon of elastic deformation of the expansion beam 11 due to squeezing. The BDU unit 2 still has the safety risk of being squeezed and damaged.

[0049] In order to solve the above problems, the BDU body 22 provided in this embodiment is provided with a sliding portion, and the fastener 23 is fixedly connected to the fixing frame 21 and can be slidably arranged on the sliding portion along the first direction. When the expansion beam 11 expands and deforms, the fastener 23 can slide on the sliding portion to absorb the displacement of the fixing frame when the expansion beam is deformed through the sliding portion.

[0050] In one implementation of this embodiment, a mounting waist-shaped hole 2201 is provided on the BDU body 22 along the second direction, the length direction of the mounting waist-shaped hole 2201 being parallel to the first direction, the fastener 23 is provided through the mounting waist-shaped hole 2201 and fixedly connected to the fixing frame 21, and the fastener 23 is slidably provided in the mounting waist-shaped hole 2201. Through the above arrangement, when the expansion beam 11 undergoes elastic deformation, the expansion beam 11 will slide in the mounting waist-shaped hole 2201 with the fastener 23, without driving the BDU body 22 to move along the first direction. That is, the mounting waist-shaped hole 2201 absorbs the displacement of the fixing frame 21 when the expansion beam 11 expands and deforms, thereby avoiding the situation where the BDU body 22 is squeezed and deformed due to movement, thereby improving the safety of the BDU body 22 in use, and does not occupy additional installation space for other components in the battery pack housing 1, preventing the overall design and manufacturing of the battery pack from becoming complicated.

[0051] Of course, it should also be noted that the setting of the mounting waist-shaped hole 2201 can absorb the manufacturing tolerance of the fixing frame 21, ensuring that the fastener 23 can be accurately fixed on the fixing frame 21 through the mounting waist-shaped hole 2201, thereby improving the assemblability of the BDU body 22 and the manufacturability of the fixing frame 21.

[0052] Specifically, in this embodiment, referring to Figure 4 As shown, the fastener 23 includes a locking bolt 231 and a rivet nut 232. The rivet nut 232 is provided on the fixing frame 21. The locking bolt 231 is inserted into the mounting waist hole 2201 and connected to the rivet nut 232. The rivet nut 232 includes a first flange 2321 located at the end of the rivet nut 232. The first flange 2321 is sandwiched between the BDU body 22 and the fixing frame 21. The provision of the locking bolt 231 and the rivet nut 232 allows the BDU body 22 to be fixedly mounted on the fixing frame 21 through a threaded connection. This not only eliminates the need to tap internal threads on the fixing frame 21, simplifies the fixing method, but also facilitates the fixation of the BDU body 22 in a narrow space.

[0053] In addition, by clamping the first flange 2321 between the BDU body 22 and the fixing frame 21, on the one hand, the surface of the BDU body 22 can be protected to prevent the fixing frame 21 from squeezing and deforming the BDU body 22 when the BDU body 22 and the fixing frame 21 are in direct contact; on the other hand, the first flange 2321 can replace the fixing frame 21 to contact the BDU body 22, thereby reducing the contact area between the fixing frame 21 and the BDU body 22, and thus making the movement of the fixing frame 21 smoother and reducing the obstruction of the BDU body 22.

[0054] Continue to refer Figure 4 As shown, the fastener 23 also includes a first screw sleeve 233, which includes a screw sleeve body 2331 and a second flange 2332. The screw sleeve body 2331 is embedded in the mounting waist-shaped hole 2201, and the second flange 2332 is provided at the end of the screw sleeve body 2331 and abuts against the BDU body 22. In addition, the locking bolt 231 includes a stud body and a third flange 2311. The stud body is provided through the screw sleeve body 2331 and connected to the rivet nut 232. The third flange 2311 is provided on the outer periphery of the stud body and abuts against the second flange 2332. It will be understood that the existing BDU body 22 is typically made of plastic to achieve electrical insulation. By providing the above-mentioned first screw sleeve 233 on the BDU body 22, the pressure of the locking bolt 231 will not act directly on the BDU body 22, but on the first screw sleeve 233, thereby avoiding the possibility of the BDU body 22 being crushed by the locking bolt 231 and causing deformation or even damage.

[0055] Furthermore, one end of the screw sleeve body 2331 away from the second flange 2332 is flush with the opening of the mounting waist-shaped hole 2201, and is connected to the first flange 2321 to support the first screw sleeve 233 through the rivet nut 232. This can eliminate the pressure of the second flange 2332 on the BDU body 22, so that the second flange 2332 only fits in contact with the BDU body 22, ensuring that when the battery pack expands and the expansion beam 11 and the fixing frame 21 move forward, the locking bolt 231 and the first screw sleeve 233 can move easily.

[0056] Furthermore, in this embodiment, a first avoidance chamfer is provided at the connection between the screw sleeve body 2331 and the second flange 2332, and a second avoidance chamfer is provided at the opening of the mounting waist-shaped hole 2201 facing the second flange 2332. The first avoidance chamfer is arranged relative to the second avoidance chamfer to provide a certain assembly gap between the first screw sleeve 233 and the mounting waist-shaped hole 2201, thereby increasing the freedom of movement of the first screw sleeve 233 along the second direction Y and facilitating the assembly of the first screw sleeve 233. It is understandable that the first avoidance chamfer and the second avoidance chamfer can be rounded chamfers or oblique chamfers, and the present invention is not limited thereto.

[0057] Optionally, refer to Figure 1 As shown, a crossbeam 12 is provided in the shell 1, and the length extension direction of the crossbeam 12 is parallel to the first direction X, and an expansion beam 11 is fixedly connected to the two ends of the crossbeam 12 along the first direction, so as to effectively reduce the elastic deformation of the expansion beam 11, thereby helping to reduce the moving distance of the fixing frame 21, the locking bolt 231 and the first screw sleeve 233, and can effectively avoid the risk of the BDU body 22 being squeezed and deformed due to the moving distance of the first screw sleeve 233 exceeding the length of the mounting waist hole 2201.

[0058] Preferably, in this embodiment, three expansion beams 11 are spaced apart along a first direction within the housing 1, and two cross beams 12 are spaced apart along a third direction between two adjacent expansion beams 11. The provision of the cross beams 12 can further reduce the elastic deformation of the expansion beams 11, thereby keeping the elastic deformation of the expansion beams 11 within a reasonable range. Battery packs can be provided on opposite sides of the cross beams 12. For example, in this embodiment, a battery pack is provided between the two cross beams 12, and a battery pack is provided between the cross beams 12 and the housing 1. In this way, a total of six battery packs can be placed within the housing 1 to meet the energy density requirements under actual operating conditions.

[0059] Optionally, in this embodiment, refer to Figure 5 As shown, along the third direction, two mounting holes 2201 are provided on the BDU body 22. Multiple mounting brackets 21 are fixedly mounted on the expansion beam 11. Each mounting hole 2201 is fixedly connected to a mounting bracket 21 via a fastener 23. This allows the multiple fasteners 23 to enhance the installation stability of the BDU body 22 within the battery pack. Furthermore, because multiple battery packs are positioned along the third direction on the expansion beam 11, these battery packs may expand to varying degrees during actual use due to factors such as heat dissipation conditions, environmental conditions, and material batches. In this embodiment, the two mounting holes 2201 are positioned relative to locations on the expansion beam 11 that are prone to expansion and deformation. This ensures that when the expansion beam 11 expands and deforms at different locations, corresponding mounting holes 2201 are present to absorb the displacement generated by the expansion beam 11, the mounting brackets 21, and the fasteners 23, thereby preventing the BDU body 22 from being squeezed and deformed by the expansion beam 11 and the housing 1.

[0060] Preferably, in this embodiment, one of the waist-shaped mounting holes 2201 is located at one end of the BDU body 22, and the other waist-shaped mounting hole 2201 is located in the middle of the BDU body 22. Of course, it is understood that this embodiment does not limit the number and location of the waist-shaped mounting holes 2201. As long as it can ensure that the BDU body 22 is not squeezed and deformed when the expansion beam 11 expands and deforms, it is within the scope of protection of the present invention.

[0061] Optionally, the BDU body 22 provided in this embodiment is further provided with three mounting through holes 2202 on the outer peripheral surface. Among the three mounting through holes 2202, one mounting through hole 2202 is located at the other end of the BDU body 22 and is fixedly connected to the outer shell 1 through a locking member 24. The other two mounting through holes 2202 are located on the side of the BDU body 2 away from the expansion beam 11 and are fixedly connected to the outer shell 1 through two locking members 24. By adding fixed points on the BDU body 22, the installation stability of the BDU unit 2 in the battery pack is further enhanced.

[0062] Specifically, the locking member 24 includes a locking bolt and a second screw sleeve. The structure of the second screw sleeve is the same as that of the first screw sleeve 233. This embodiment will not be described in detail here. The second screw sleeve is embedded in the mounting through hole 2202, and the locking bolt is threadedly connected to the housing 1 via the second screw sleeve. It should be noted that in this embodiment, the second screw sleeve is fixed in the mounting through hole 2202 by welding or bonding, so that the second screw sleeve and the BDU body 22 are integrated. Since the locking bolt does not need to move along the first direction X in the mounting through hole 2202, there is no need to design the second screw sleeve and the mounting through hole 2202 to be movably connected. By fixing the second screw sleeve in the mounting through hole 2202, installation failures caused by loosening of the locking member 24 can be reduced, thereby ensuring the stability of the BDU body 22.

[0063] Optionally, in this embodiment, in order to speed up the installation efficiency of the battery pack, the BDU body 22 is also improved.

[0064] Specifically, refer to Figure 6 As shown, the BDU body 22 includes a base 222 and a top cover 221. The base 222 houses an electrical component 223. The base 222 is provided with the aforementioned waist-shaped mounting holes 2201. Along the third direction Z, the end surface of the base 222 is provided with a boss 2221 projecting outward. Furthermore, the top cover 221 includes a top cover body 2211 and a snap-fit ​​structure 2212. The top cover body 2211 is provided with the snap-fit ​​structure 2212, which has a snap-fit ​​groove 22121. When the top cover body 2211 is snapped onto the base 222, the boss 2221 snaps into the snap-fit ​​groove 22121. In this way, after the electrical component 223 is accurately placed in the base 222, the upper cover 221 is sealed and fastened to the base 222, and at the same time, the boss 2221 can be snapped into the slot 22121, thereby completing the fixed connection between the upper cover 221 and the base 222, thereby simplifying the fixing method of the upper cover 221 and the base 222, improving the assembly efficiency of the BDU unit 2, and ensuring a good connection firmness between the upper cover 221 and the base 222.

[0065] It can be understood that, referring to the prior art, the electrical components 223 in the BDU unit 2 generally include main fuses, main relays, pre-charge relays, pre-charge resistors, shunts, PTC relays, PTC fuses, HVH fuses and other components, which will not be elaborated in this embodiment.

[0066] Optionally, a guide structure 2222 is further provided on the base 222. Figure 8 The guide ribs shown are located on one side of the boss 2221 and extend along the second direction. When the upper cover body 2211 is fastened to the base 222, the guide ribs slide in contact with the guide structure 2222 and guide the slot 22121 to engage with the boss 2221, thereby effectively improving the assembly accuracy between the upper cover body 2211 and the base 222 and reducing assembly errors. Preferably, in this embodiment, a guide structure 2222 is provided on each opposite side of the boss 2221 to further prevent the guide structure 2222 from shifting during movement of the upper cover body 2211.

[0067] In order to improve operability, in this embodiment, the clamping structure 2212 includes a clamping plate 22122 and a rib 22123, wherein the clamping plate 22122 has the above-mentioned clamping groove 22121, and the opposite sides of the clamping plate 22122 are connected to the upper cover body 2211 through the rib 22123 to form an avoidance gap 2213 between the side wall of the clamping plate 22122 and the upper cover body 2211, and a pressing groove 2214 is provided between one end of the clamping plate 22122 and the upper cover body 2211, and the pressing groove 2214 is connected to the avoidance gap 2213 so that the clamping plate 22122 can rotate around the rib 22123. Through the above arrangement, when it is necessary to remove the upper cover 221 to inspect and maintain the electrical components 223 in the base 222, the staff can press the other end of the clamping plate 22122 to rotate the clamping plate 22122 around the rib 22123, and one end of the clamping plate 22122 moves outward, so that an angle less than 90° is formed between the clamping plate 22122 and the boss 2221, thereby facilitating the disassembly of the upper cover 221.

[0068] It should be noted that the end of the clamping structure 2212 facing the boss 2221 also has a first chamfer 22124, and the end of the boss 2221 facing the clamping structure 2212 has a second chamfer 22211. The first chamfer 22124 and the second chamfer 22211 are arranged relative to each other to reduce the sliding resistance between the clamping structure 2212 and the boss 2221, so as to facilitate the boss 2221 to be clamped in the clamping groove 22121.

[0069] Preferably, in this embodiment, both ends of the upper cover body 2211 are provided with the aforementioned snap-fit ​​structures 2212, one of the snap-fit ​​structures 2212 is provided with the aforementioned pressing groove 2214, and the other snap-fit ​​structure 2212 is not provided with the aforementioned pressing groove 2214. This improves the efficiency of disassembling the upper cover 221 and the base 222 by simplifying only one of the snap-fit ​​structures 2212, while also helping to control the manufacturing cost of the upper cover body 2211. Of course, in other embodiments, both snap-fit ​​structures 2212 can be designed to have pressing grooves 2214 according to actual customer needs. Therefore, both of the aforementioned embodiments are within the scope of protection of the present utility model.

[0070] Optionally, in this embodiment, two opposite inner side walls of the upper cover body 2211 are provided with a downwardly protruding limit plate 2215 ( Figure 8 Only the limiting plate 2215 on one side of the upper cover body 2211 is shown. When the upper cover body 2211 is fastened to the base 222, the two limiting plates 2215 can respectively abut against the two opposing inner side walls of the base 222. The two limiting plates 2215 work together to limit the upper cover body 2211 from deflecting along the first direction X, thereby ensuring that the upper cover body 2211 and the base 222 are completely aligned with each other without leaving any gaps. At the same time, since both the upper cover 221 and the base 222 are made of plastic, which has the inherent property of deforming, the base 222 will deform inward during use. However, by providing the limiting plates 2215 in this embodiment, the limiting plates 2215 can suppress the tendency of the base 222 to deform inward, thereby supporting the side walls of the base 222 to be straight and not bend, thereby maintaining the structural stability of the BDU body 22 and extending its service life.

[0071] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0072] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction and a second direction, the first direction being perpendicular to the second direction, and includes: A housing (1) is provided with a housing cavity, a battery pack and an expansion beam (11) are provided in the housing cavity, the battery pack includes a plurality of single cells, the plurality of single cells are arranged in sequence along the first direction, and along the first direction, one expansion beam (11) is attached to each end of the battery pack, the expansion beam (11) generates elastic deformation along the first direction at least when the single cells expand; A BDU unit (2) is provided in the accommodating cavity and is located between the expansion beam (11) and the housing (1). The BDU unit (2) comprises a fixing frame (21), a BDU body (22) and a fastener (23). The fixing frame (21) is fixedly connected to the expansion beam (11). A sliding portion is provided on the BDU body (22). The fastener (23) is fixedly connected to the fixing frame (21) and can be slidably provided on the sliding portion along the first direction.

2. The battery pack according to claim 1, wherein: Along the second direction, a mounting waist-shaped hole (2201) for forming the sliding portion is provided through the BDU body (22), and the length direction of the mounting waist-shaped hole (2201) is parallel to the first direction. The fastener (23) is provided through the mounting waist-shaped hole (2201) and is fixedly connected to the fixing frame (21), and the fastener (23) is slidably provided in the mounting waist-shaped hole (2201).

3. The battery pack according to claim 2, wherein: The fastener (23) includes a locking bolt (231) and a rivet nut (232); the rivet nut (232) is provided on the fixing frame (21); the locking bolt (231) is passed through the mounting waist-shaped hole (2201) and is connected to the rivet nut (232); the rivet nut (232) includes a first flange (2321); and the first flange (2321) is clamped between the BDU body (22) and the fixing frame (21).

4. The battery pack according to claim 3, wherein: The fastener (23) further comprises a first screw sleeve (233), wherein the first screw sleeve (233) comprises a screw sleeve body (2331) and a second flange (2332), wherein the screw sleeve body (2331) is embedded in the mounting waist-shaped hole (2201), and the second flange (2332) is arranged at the end of the screw sleeve body (2331) and abuts against the BDU body (22); The locking bolt (231) includes a stud body and a third flange (2311). The stud body is inserted into the sleeve body (2331) and connected to the rivet nut (232). The third flange (2311) is arranged on the outer periphery of the stud body and abuts against the second flange (2332).

5. The battery pack according to claim 4, characterized in that: A first avoidance chamfer is provided at the connection between the screw sleeve body (2331) and the second flange (2332), and a second avoidance chamfer is provided at the opening of the mounting waist-shaped hole (2201) facing the second flange (2332), and the first avoidance chamfer is arranged relative to the second avoidance chamfer.

6. The battery pack according to claim 4, characterized in that: One end of the screw sleeve body (2331) away from the second flange (2332) is flush with the opening of the mounting waist-shaped hole (2201) and is connected to the first flange (2321) to support the first screw sleeve (233) through the rivet nut (232).

7. The battery pack according to claim 2, characterized in that: Along the third direction, the BDU body (22) is provided with a plurality of the mounting waist-shaped holes (2201), the expansion beam (11) is fixed with a plurality of the fixing frames (21), each of the mounting waist-shaped holes (2201) is fixedly connected to the fixing frame (21) via a fastener (23), the third direction is parallel to the length extension direction of the expansion beam (11), and the third direction, the second direction and the first direction are perpendicular to each other.

8. The battery pack according to any one of claims 2 to 7, characterized in that: The BDU body (22) includes a base (222) and an upper cover (221); an electrical component (223) is provided in the base (222); the base (222) is provided with the mounting waist-shaped hole (2201); and a boss (2221) is provided on the side wall of the base (222); The upper cover (221) comprises an upper cover body (2211) and a snap-fit ​​structure (2212). The upper cover body (2211) is provided with the snap-fit ​​structure (2212). The snap-fit ​​structure (2212) has a snap-fit ​​groove (22121). When the upper cover body (2211) is buckled onto the base (222), the boss (2221) is snap-fitted into the snap-fit ​​groove (22121).

9. The battery pack according to claim 8, characterized in that: The base (222) is further provided with a guide structure (2222). When the upper cover body (2211) is buckled onto the base (222), the guide structure (2222) can guide the card slot (22121) to be snapped onto the boss (2221).

10. The battery pack according to claim 8, wherein: At least two inner side walls of the upper cover body (2211) are provided with a limit plate (2215) protruding downwards. When the upper cover body (2211) is buckled onto the base (222), the two limit plates (2215) are respectively fitted and abutted against the inner side walls of the base (222).

11. The battery pack according to claim 8, characterized in that: The snap-fit ​​structure (2212) includes a snap-fit ​​plate (22122) and a rib (22123), wherein the snap-fit ​​plate (22122) has the snap-fit ​​groove (22121), and the opposite sides of the snap-fit ​​plate (22122) are connected to the upper cover body (2211) via a rib (22123) respectively, so as to form an avoidance gap (2213) between the side wall of the snap-fit ​​plate (22122) and the upper cover body (2211), and a pressing groove (2214) is provided between one end of the snap-fit ​​plate (22122) and the upper cover body (2211), and the pressing groove (2214) is connected to the avoidance gap (2213) so that the snap-fit ​​plate (22122) can rotate around the rib (22123).

12. The battery pack according to claim 8, wherein: The end of the clamping structure (2212) facing the boss (2221) has a first chamfer (22124), and the end of the boss (2221) facing the clamping structure (2212) has a second chamfer (22211), and the first chamfer (22124) and the second chamfer (22211) are arranged opposite to each other.

Images