Battery pack

Abstract

The invention 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 present invention 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, but 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. Summary of the invention

[0005] The object of the present invention 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, increase the space occupied by other components in the battery pack shell, and affect the design and production of the battery pack.

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

[0007] A battery pack has a first direction and a second direction, wherein the first direction is perpendicular to the second direction, and the battery pack comprises:

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

[0009] A BDU unit, the 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 part is arranged on the BDU body. The fastener is fixedly connected to the fixing frame and can be slidably arranged on the sliding part along the first direction.

[0010] Preferably, along the second direction, a mounting waist-shaped hole for forming the sliding part is penetrated on 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 arranged 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 comprises a screw sleeve body and a second flange, the screw sleeve body is embedded in the mounting waist-shaped hole, and the second flange is arranged at the end of the screw sleeve body and abuts 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 frames are fixed on the expansion beam, each of the mounting waist-shaped holes is fixedly connected to the fixing frame 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 comprises 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 groove. When the upper cover body is buckled on the base, the boss is clamped in the clamping groove.

[0019] Preferably, the base is further provided with a guiding structure, and when the upper cover body is buckled on the base, the guiding 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-on structure includes a snap-on plate and a rib, the snap-on plate having the snap-on groove, and the opposite sides of the snap-on plate are each connected to the upper cover body via a rib to form an avoidance gap between the side wall of the snap-on plate and the upper cover body, and a pressing groove is provided between one end of the snap-on plate and the upper cover body, and the pressing groove is connected to the avoidance gap so that the snap-on plate can rotate around the rib.

[0022] Preferably, one end of the clamping structure facing the boss has a first chamfer, and one 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 the present invention are as follows: by arranging a sliding part on the BDU body, when the expansion beam undergoes elastic deformation, the expansion beam will slide on the sliding part with the fastener, and will not drive the BDU body to move along the first direction, so that the position of the BDU body remains unchanged. In other words, the sliding part absorbs the displacement of the fixing frame when the expansion beam expands and deforms, thereby avoiding the situation where the BDU body is squeezed and deformed due to movement, thereby improving the safety of the BDU body, and will not occupy additional installation space for other components in the battery pack shell, preventing the overall design and manufacturing of the battery pack from becoming complicated. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0028] Figure 5 is a schematic diagram of the structure of a BDU unit provided in an embodiment of the present invention;

[0029] Figure 6 is a structural exploded diagram of a BDU unit provided in an embodiment of the present invention;

[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 figure:

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

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

[0035] 21. Fixed frame;

[0036] 22. BDU body; 2201. Installation waist hole; 2202. Installation through hole; 221. Upper cover; 2211. Upper cover body; 2212. Snap-on structure; 22121. Slot; 22122. Snap-on 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 screw sleeve; 2331, screw sleeve body; 2332, second flange;

[0038] 24. Locking piece. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0042] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

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

[0044] It should be noted in advance that in the drawings of the embodiments of the present application, the first direction is indicated by a double-headed arrow marked with X, the second direction is indicated by a double-headed arrow marked with Y, and the third direction is indicated by a double-headed arrow marked with Z. In this embodiment, the first direction X corresponds to the thickness direction of the single battery cell. For a square single battery cell, the directions corresponding to its two large faces are the thickness directions, that is, the first direction X; the second direction Y corresponds to the height direction of the single battery cell; the third direction Z corresponds to the length direction of the single battery 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 matching 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 arranged 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 of the two ends of the battery pack along the first direction. The length of the expansion beam 11 is extended along a third direction, and its two ends are fixed on the inner wall of the outer shell 1. In this embodiment, the battery pack abandons the traditional module structure, and instead arranges a plurality of single cells into groups to form a battery pack, and then directly sets the battery pack in the accommodating cavity, and shapes it through the expansion beams 11 attached at both ends to prevent the battery pack from shaking, so that 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 charge and discharge 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, so that more battery packs can 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 occupy additional installation space for other components in the battery pack shell 1, and the phenomenon of elastic deformation of the expansion beam 11 due to squeezing cannot be completely eliminated. The BDU unit 2 still has the safety risk of being squeezed and damaged.

[0049] In order to solve the above problems, a sliding portion is provided on the BDU body 22 provided in this embodiment, 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] One implementation of this embodiment is that a waist-shaped mounting hole 2201 is provided on the BDU body 22 along the second direction, the length direction of the waist-shaped mounting hole 2201 is parallel to the first direction, the fastener 23 is provided through the waist-shaped mounting hole 2201 and is fixedly connected to the fixing frame 21, and the fastener 23 is slidably provided in the waist-shaped mounting hole 2201. Through the above arrangement, when the expansion beam 11 undergoes elastic deformation, the expansion beam 11 will slide in the waist-shaped mounting hole 2201 with the fastener 23, and will not drive the BDU body 22 to move along the first direction, that is, the waist-shaped mounting 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, so that the use safety of the BDU body 22 is improved, and it will not occupy the installation space of other components in the battery pack shell 1, and prevent 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, reference Figure 4 As shown, the fastener 23 includes a locking bolt 231 and a rivet nut 232, wherein the rivet nut 232 is provided on the fixing frame 21, the locking bolt 231 is passed through the installation waist hole 2201 and connected to the rivet nut 232, and the rivet nut 232 includes a first flange 2321 located at the end of the rivet nut 232, and the first flange 2321 is sandwiched between the BDU body 22 and the fixing frame 21. Through the arrangement of the locking bolt 231 and the rivet nut 232, the BDU body 22 can be fixedly installed on the fixing frame 21 by threaded connection, which not only saves the operation of tapping the internal thread on the fixing frame 21, simplifies the fixing method, but also facilitates the fixing 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, thereby 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, the first screw sleeve 233 includes a screw sleeve body 2331 and a second flange 2332, the screw sleeve body 2331 is embedded in the installation waist hole 2201, and the second flange 2332 is arranged at the end of the screw sleeve body 2331, and fits against the BDU body 22. In addition, the locking bolt 231 includes a stud body and a third flange 2311, the stud body is penetrated through the screw sleeve body 2331 and connected to the rivet nut 232, and the third flange 2311 is arranged on the periphery of the stud body and fits against the second flange 2332. It can be understood that the existing BDU body 22 is usually a plastic part 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 directly act 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 the present 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, and the first avoidance chamfer is provided relative to the second avoidance chamfer, so that there is a certain assembly gap between the first screw sleeve 233 and the mounting waist-shaped hole 2201, and the freedom of movement of the first screw sleeve 233 along the second direction Y is increased, so as to facilitate the assembly of the first screw sleeve 233. It is understandable that the first avoidance chamfer and the second avoidance chamfer can be round 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 outer 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 arranged in the housing 1 at intervals along the first direction, and two cross beams 12 are arranged between two adjacent expansion beams 11 along the third direction. The arrangement of the cross beams 12 can further reduce the elastic deformation of the expansion beams 11, so that the elastic deformation of the expansion beams 11 is controlled within a reasonable range. Battery packs can be arranged on both sides of the cross beams 12. For example, in this embodiment, a battery pack is arranged between the two cross beams 12, and a battery pack is arranged between the cross beam 12 and the housing 1. In this way, a total of six battery packs can be placed in the housing 1 to meet the energy density usage requirements under actual working conditions.

[0059] Optionally, in this embodiment, refer to Figure 5 As shown, along the third direction, two mounting waist-shaped holes 2201 are arranged on the BDU body 22, and a plurality of fixing frames 21 are fixedly arranged on the expansion beam 11, and each mounting waist-shaped hole 2201 is respectively fixedly connected to a fixing frame 21 by a fastener 23, so that the installation stability of the BDU body 22 in the battery pack can be improved by a plurality of fasteners 23. At the same time, since the expansion beam 11 is provided with a plurality of battery packs along the third direction, the expansion degree of these battery packs is not completely the same due to different factors such as heat dissipation conditions, environment, and material batches during actual use, and the positions of the two mounting waist-shaped holes 2201 in this embodiment are designed to be at two positions on the expansion beam 11 that are prone to expansion and deformation, so that when the expansion beam 11 is expanded and deformed at different positions, there are corresponding mounting waist-shaped holes 2201 to absorb the displacement generated by the expansion beam 11, the fixing frame 21 and the fastener 23, thereby ensuring that the BDU body 22 will not be squeezed and deformed by the expansion beam 11 and the shell 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 can be understood that this embodiment does not limit the number and position of the waist-shaped mounting holes 2201, as long as it can ensure that the BDU body 22 will not be squeezed and deformed when the expansion beam 11 is expanded and deformed, it is within the protection scope 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 piece 24, and 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 pieces 24, so as to further enhance the installation stability of the BDU unit 2 in the battery pack by adding fixed points on the BDU body 2.

[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 repeated here. The second screw sleeve is embedded in the installation through hole 2202, and the locking bolt is threadedly connected to the housing 1 through the second screw sleeve. It should be noted that in this embodiment, the second screw sleeve is fixed in the installation 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 installation through hole 2202, it is not necessary to design the second screw sleeve and the installation through hole 2202 to be in a movable connection. By fixing the second screw sleeve in the installation through hole 2202, the installation failure caused by the loosening of the locking member 24 can be reduced, thereby ensuring the stability of the use of the BDU body 22.

[0063] Optionally, in this embodiment, in order to increase 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 an upper cover 221, wherein an electrical component 223 is disposed in the base 222, the base 222 is provided with the above-mentioned waist-shaped mounting hole 2201, and along the third direction Z, the end surface of the base 222 is provided with a boss 2221 protruding outward. In addition, the upper cover 221 includes an upper cover body 2211 and a clamping structure 2212, the upper cover body 2211 is provided with a clamping structure 2212, and the clamping structure 2212 has a clamping groove 22121, and when the upper cover body 2211 is buckled on the base 222, the boss 2221 is clamped in the clamping 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 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 a main fuse, a main relay, a pre-charge relay, a pre-charge resistor, a shunt, a PTC relay, a PTC fuse, an HVH fuse and other components, which will not be described in detail in this embodiment.

[0066] Optionally, the base 222 is further provided with a guide structure 2222. 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 buckled on the base 222, the guide ribs are in sliding contact with the guide structure 2222 and can guide the card slot 22121 to be snapped onto the boss 2221, thereby effectively improving the efficiency of the assembly accuracy between the upper cover body 2211 and the base 222 and reducing the assembly error. Preferably, in this embodiment, a guide structure 2222 is provided on each of the opposite sides of the boss 2221 to further prevent the guide structure 2222 from being offset during the 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 respectively connected to the upper cover body 2211 through the ribs 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 clip plate 22122 to rotate the clip plate 22122 around the rib 22123, and one end of the clip plate 22122 moves outward, so that an angle less than 90° is formed between the clip plate 22122 and the boss 2221, thereby facilitating the removal of the upper cover 221.

[0068] It should be supplemented that the end of the snap-in structure 2212 facing the boss 2221 also has a first chamfer 22124, and the end of the boss 2221 facing the snap-in 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 snap-in structure 2212 and the boss 2221, thereby facilitating the boss 2221 to be snapped into the slot 22121.

[0069] Preferably, in this embodiment, both ends of the upper cover body 2211 are provided with the above-mentioned clamping structures 2212, and one of the clamping structures 2212 is provided with the above-mentioned pressing groove 2214, while the other clamping structure 2212 is not provided with the above-mentioned pressing groove 2214, so as to achieve the purpose of improving the disassembly efficiency of the upper cover 221 and the base 222 by simplifying only one of the clamping structures 2212, and also help to control the manufacturing cost of the upper cover body 2211. Of course, in other embodiments, both clamping structures 2212 can be designed to have a pressing groove 2214 according to actual customer needs, so the above two examples are within the scope of protection of the present invention.

[0070] Optionally, in this embodiment, two opposite inner side walls of the upper cover body 2211 are provided with stopper plates 2215 ( Figure 8 Only the limiting plate 2215 on one side of the upper cover body 2211 is shown in the figure. When the upper cover body 2211 is buckled on the base 222, the two limiting plates 2215 can respectively fit against the two opposite inner side walls of the base 222. The two limiting plates 2215 cooperate with each other to limit the displacement of the upper cover body 2211 along the first direction X, thereby ensuring that the upper cover body 2211 and the base 222 are completely fitted without leaving any gaps. At the same time, since both the upper cover 221 and the base 222 are made of plastic material, the plastic itself has the property of deformation, so the base 222 will have a deformation property of sinking inwards when in use. In this embodiment, by setting the limiting plate 2215, the limiting plate 2215 can suppress the tendency of the base 222 to sink inwards, thereby supporting the side wall of the base 222 to be straight and not bent, thereby maintaining the structural stability of the BDU body 22 and extending the service life.

[0071] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

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

2. The battery pack according to claim 1, characterized in that: Along the second direction, a mounting waist-shaped hole (2201) for forming the sliding part is penetrated on 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 penetrated through the mounting waist-shaped hole (2201) and is fixedly connected to the fixing frame (21), and the fastener (23) can be slidably arranged in the mounting waist-shaped hole (2201).

3. The battery pack according to claim 2, characterized in that: The fastener (23) comprises 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) comprises 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, characterized in that: 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 fixedly provided 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) comprises a base (222) and an upper cover (221); an electrical component (223) is arranged inside the base (222); the base (222) is provided with the mounting waist-shaped hole (2201); and a boss (2221) is arranged on a side wall of the base (222); The upper cover (221) comprises an upper cover body (2211) and a snap-on structure (2212); the upper cover body (2211) is provided with the snap-on structure (2212); the snap-on structure (2212) has a snap-on groove (22121); when the upper cover body (2211) is buckled onto the base (222), the boss (2221) is snap-on into the snap-on groove (22121).

9. The battery pack according to claim 8, characterized in that: The base (222) is also 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, characterized in that: At least two inner side walls of the upper cover body (2211) are provided with limit plates (2215) protruding downwards, and 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 clamping structure (2212) includes a clamping plate (22122) and a rib (22123), the clamping plate (22122) having the clamping groove (22121), and the opposite sides of the clamping plate (22122) are connected to the upper cover body (2211) through a rib (22123) respectively, so as 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 with the avoidance gap (2213) so that the clamping plate (22122) can rotate around the rib (22123).

12. The battery pack according to claim 8, characterized in that: 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