A battery pack

Abstract

This utility model relates to the field of battery technology, and in particular to a battery pack, including a housing, a middle beam, a busbar, a first buffer, and multiple battery cells; the housing includes a housing body and a housing cover, the housing body has a receiving cavity, the middle beam divides the receiving cavity into a first cavity and a second cavity, the battery cells are disposed in the first cavity and the second cavity, the busbar extends along a second direction and has a first end and a second end opposite to each other, both the first end and the second end are fixed to the housing body, the busbar also has a fixing part located between the first end and the second end, the fixing part is connected to the middle beam; along the first direction, the first buffer is located between the busbar and the battery cells; and along the second direction, the first buffer is located between the fixing part and the first end, and / or between the fixing part and the second end. In the first direction, the first buffer limits the busbar in the first direction, reducing the vibration amplitude of the busbar during use or testing.

Description

Technical Field

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

[0002] Battery packs typically include long, narrow busbars for electrical connections between different components within the pack, or for connecting the battery system's positive and negative output terminals to the same side of the pack, facilitating connections to external components. These busbars are often quite long, and current designs only fix both ends to the sides of the battery pack, leaving the middle section suspended. During battery pack vibration tests and vehicle movement, this suspended section vibrates significantly. This vibration is transmitted to the connections between the busbars and other components, accelerating fatigue at these points and increasing the risk of electrical connection failures or short circuits, ultimately impacting the performance of both the battery pack and the vehicle. Utility Model Content

[0003] The technical problem to be solved by this utility model is that the busbar of the existing battery pack will generate a large amplitude of vibration during vibration testing and use.

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a battery pack having a first direction, a second direction and a third direction that are perpendicular to each other, characterized in that it includes a box body, a middle beam, a busbar, a first buffer and a battery unit;

[0005] The enclosure includes a main body and a lid. The main body has an opening on one side along the first direction, and the lid covers the opening, forming a receiving cavity with the lid and the main body. A middle beam is disposed in the receiving cavity and connected to the main body. The middle beam extends along the third direction and divides the receiving cavity into a first cavity and a second cavity. The battery unit is disposed in the first cavity and the second cavity.

[0006] The busbar extends along the second direction and has a first end and a second end opposite to each other. Both the first end and the second end are fixed to the box body. The busbar also has a fixing part, which is located between the first end and the second end and connected to the intermediate beam.

[0007] Along the first direction, the first buffer is located between the busbar and the battery cell; and along the second direction, the first buffer is located between the fixing portion and the first end, and / or between the fixing portion of the first buffer and the second end.

[0008] In some embodiments, the battery pack further includes a connector, which includes a connector base and a cover. The connector base is connected to the intermediate beam, and the cover covers the connector base, with both forming a limiting hole. The fixing part passes through the limiting hole.

[0009] In some embodiments, the connecting seat has a limiting groove extending along the second direction;

[0010] The cover is detachably connected to the connecting seat (42) along the first direction and covers the limiting groove, and the cover and the limiting groove together form the limiting hole.

[0011] In some embodiments, the connecting seat includes a seat body, a first latch and a second latch, the limiting groove is disposed on the seat body, and the first latch and the second latch are respectively located at both ends of the seat body along the third direction;

[0012] The cover includes a cover plate, a first connecting arm, and a second connecting arm. The first connecting arm and the second connecting arm are respectively disposed at both ends of the cover plate along the third direction. The first connecting arm has a first slot, and the second connecting arm has a second slot. The first buckle is fastened to the first slot, and the second buckle is fastened to the second slot.

[0013] In some embodiments, the connector further includes a snap-fit ​​assembly;

[0014] The buckle assembly is located on the side of the connecting seat away from the fixing part, and the side of the intermediate beam facing the connecting seat has a locking hole. The buckle assembly is inserted into the locking hole so that the connecting seat is connected to the intermediate beam.

[0015] In some embodiments, the latching assembly includes a protrusion and a spring arm;

[0016] One end of the protrusion is connected to the connecting seat, and the other end is connected to the spring arm. The spring arm is engaged in the locking hole and is used to prevent the protrusion from disengaging from the locking hole along the first direction.

[0017] In some embodiments, the snap-fit ​​assembly further includes an elastic clamping member, the two ends of which are respectively connected to the connecting seat and the intermediate beam along the first direction, and the elastic clamping member is spaced apart from the protrusion and the spring arm.

[0018] In some embodiments, the battery pack further includes an anti-wear sleeve, which passes through the limiting hole and is fitted onto the fixing portion.

[0019] In some embodiments, the battery pack further includes a second buffer; the second buffer is located at least partially between the busbar and the cover along the first direction; and along the second direction, the second buffer is located between the fixing portion and the first end, and / or between the fixing portion and the second end.

[0020] In some embodiments, the battery pack further includes an insulating sleeve at least partially located between the first buffer and the busbar, and / or, the insulating sleeve at least partially located between the second buffer and the busbar.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] The battery pack of this utility model includes a housing, a central beam, a busbar, a first buffer, and battery cells. The housing includes a main body and a cover. The main body has an opening on one side along a first direction, and the cover covers the opening, forming a receiving cavity with the cover. The central beam is disposed in the receiving cavity and connected to the main body. The central beam extends along a third direction and divides the receiving cavity into a first cavity and a second cavity, thereby enhancing the strength of the housing. The battery cells are disposed in the first and second cavities. The busbar extends along a second direction and has opposing first and second ends, both of which are fixed to the main body. The busbar also has a fixing part located at the first... The busbar is connected to the intermediate beam between one end and the second end. The intermediate beam structure of the box body adds a support point to the suspended middle section of the busbar, thereby ensuring the connection of the busbar is firm. Along the first direction, the first buffer is located between the busbar and the battery unit. Along the second direction, the first buffer is located between the fixed part and the first end and / or between the fixed part and the second end. In the first direction, the first buffer limits the busbar and can buffer it when the busbar vibrates. With the joint support of the fixed part on the intermediate beam and the first buffer, the length of the suspended section of the long busbar is greatly reduced, and the vibration prevention effect is outstanding during use or testing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the external structure of the battery pack of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the battery pack of this utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the battery pack of this utility model after only one row of battery cells is installed;

[0026] Figure 4 This is a schematic diagram of the connection structure between the busbar and the intermediate beam;

[0027] Figure 5 It is an isometric view of the connector;

[0028] Figure 6 This is an isometric view of the connector;

[0029] Figure 7 This is the front view of the connector;

[0030] Figure 8 It is an axonometric drawing of the cover.

[0031] Figure 9 This is a schematic diagram of the first configuration method for the first and second buffer components;

[0032] Figure 10 This is a schematic diagram of a second configuration of the first and second buffer components;

[0033] Figure 11 This is a schematic diagram of a third configuration method for the first and second buffer components;

[0034] In the diagram, Z represents the first direction, X represents the second direction, Y represents the third direction, 1 represents the housing, 11 represents the cover, 12 represents the main body, 121 represents the opening, 122 represents the first housing wall, 123 represents the second housing wall, 13 represents the receiving cavity, 131 represents the first cavity, 132 represents the second cavity, 2 represents the intermediate beam, 21 represents the locking hole, 3 represents the busbar, 31 represents the first end, 32 represents the second end, 33 represents the fixing part, 4 represents the connecting piece, 41 represents the limiting hole, 42 represents the connecting seat, 421 represents the seat body, 4211 represents the limiting groove, 4212 represents the groove opening, 4213 represents the connecting plate, 421 represents the connecting plate. 4. Third connecting arm; 42141. First side; 4215. Fourth connecting arm; 42151. Second side; 422. First buckle; 423. Second buckle; 43. Cover; 431. Cover plate; 432. First connecting arm; 4321. First slot; 433. Second connecting arm; 4331. Second slot; 434. Installation space; 44. Buckle assembly; 441. Protrusion; 442. Elastic clamping element; 443. Spring arm; 51. First buffer element; 52. Second buffer element; 6. Battery unit; 7. Anti-wear sleeve; 8. Insulating sleeve. Detailed Implementation

[0035] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances, equal angles, or equal areas refer to a state in which the tolerance range is -1% to 1%.

[0040] like Figures 1 to 11As shown, in a preferred embodiment of the battery pack of this utility model, there are two perpendicular directions: a first direction Z, a second direction X, and a third direction Y. The battery pack includes a housing 1, a middle beam 2, a busbar 3, a first buffer 51, and battery cells 6. The housing 1 includes a housing body 12 and a housing cover 11. The housing body 12 has an opening 121 on one side along the first direction Z. The housing cover 11 covers the opening 121, and the housing cover 11 and the housing body 12 form a receiving cavity 13. The battery cells 6 are placed into the receiving cavity 13 through the opening 121. The middle beam 2 is disposed in the receiving cavity 13 and connected to the housing body 12. The middle beam 2 extends along the third direction Y and divides the receiving cavity 13 into a first cavity 131. The intermediate beam 2 not only enables the partitioned storage of the battery units 6, but more importantly, it supports and reinforces the housing 1, improving the deformation resistance of the housing 1 under external impact or vibration, and ensuring the structural stability of the battery pack. The battery units 6 are located in the first and second cavities 131 and 132. Specifically, the battery unit 6 includes multiple battery cells, which are respectively located in the first and second cavities 131 and 132. The busbar 3 extends along the second direction X and has a first end 31 and a second end 32. Both the first end 31 and the second end 32 are fixed to the housing body 12. The busbar 3 also... It has a fixing part 33, which is located between the first end 31 and the second end 32 and connected to the intermediate beam 2; specifically, in the second direction X, the housing 1 has a first housing wall 122 and a second housing wall 123 arranged at relatively intervals. Since the battery management system of the battery pack is generally located at one end of the housing 1 in the second direction X, and the battery pack has two cavities along the second direction X, the battery cells 6 in the cavity away from the battery management system need to be electrically connected to the battery management system through the introduction of a busbar 3. One end of the busbar 3 is connected to the second housing wall 123, and the other end of the busbar 3 is connected to the first housing wall 122; the busbar 3 is not only fixed at both ends to the housing body 12, but also in the middle The fixing part 33 is also connected to the intermediate beam 2. By utilizing the inherent intermediate beam 2 structure of the box body 12, a support point is added to the suspended middle section of the busbar 3, forming a multi-point fixing structure for the busbar 3. This solves the problem of the middle section being suspended due to the traditional busbar 3 being fixed only at both ends, reduces the swaying amplitude of the busbar 3 during vibration or movement, and lowers the risk of electrical connection failure or short circuit due to fatigue damage at the connection points. Along the first direction Z, the first buffer 51 is located between the busbar 3 and the battery unit 6; and along the second direction X, the first buffer 51 is located between the fixing part 33 and the first end 31, and / or the first buffer 51 is located between the fixing part 33 and the second end 32. In this embodiment, the first buffer 51 is provided between the fixing part 33 and the first end 31, and between the fixing part 33 and the second end 32. In some embodiments of this utility model, the first buffer 51 may be provided only between the fixing part 33 and the first end 31, or only between the fixing part 33 and the second end 32.In the first direction Z, the first buffer 51 can effectively limit the busbar 3 and play a buffering role when the busbar 3 is vibrating, further buffering the vibration of the busbar 3 and preventing damage caused by direct collision between the busbar 3 and the battery unit 6.

[0041] In some embodiments of this utility model, the battery pack further includes a connector 4, which includes a connecting seat 42 and a cover 43. The connecting seat 42 is connected to the intermediate beam 2, and the cover 43 covers the connecting seat 42, with both forming a limiting hole 41. The fixing part 33 passes through the limiting hole 41. The connector 4 is connected to the intermediate beam 2 through the connecting seat 42. The limiting hole 41 formed by the cover 43 and the connecting seat 42 provides a precise installation and positioning space for the fixing part 33 of the busbar 3. When the fixing part 33 passes through the limiting hole 41, the hole wall of the limiting hole 41 surrounds the outer periphery of the fixing part 33. The hole wall of the limiting hole 41 can constrain the fixing part 33 of the busbar 3 from multiple directions, making the connection between the busbar 3 and the intermediate beam 2 more stable and reliable. Moreover, the cover 43 makes the connection between the busbar 3 and the intermediate beam 2 more stable and reliable. The installation and removal of the fixing part 33 on the intermediate beam 2 are more convenient: Specifically, when installing the fixing part 33, the cover 43 can be removed from the connecting seat 42 first, the fixing part 33 can be placed directly in the corresponding position of the connecting seat 42, and then the cover 43 can be closed on the connecting seat 42. The fixing part 33 can be fixed by the limiting hole 41 formed by the two. When it is necessary to remove the fixing part 33, simply open the cover 43 to easily remove the fixing part 33 from the connecting seat 42. This detachable structural design simplifies the assembly process of the busbar 3 and provides convenience for later inspection, replacement and other maintenance operations, effectively improving the assembly efficiency and maintenance convenience of the battery pack.

[0042] In some embodiments of this utility model, the connecting seat 42 has a limiting groove 4211 extending along the second direction X; the cover 43 is detachably connected to the connecting seat 42 along the first direction Z and covers the limiting groove 4211, and the cover 43 and the limiting groove 4211 together form a limiting hole 41. By setting all the limiting grooves 4211 used to form the limiting hole 41 on the connecting seat 42, the structure of the cover 43 can be simplified, facilitating the processing of the connecting member 4. Specifically, in the first direction Z, the connecting seat 42 has a slot 4212 on the side opposite to the intermediate beam 2 that communicates with the limiting groove 4211, allowing the busbar 3 to move into the limiting groove 4211 along the first direction Z through the slot 4212; the cover 43 covers the slot 4212, enclosing the limiting groove 4211 to form the limiting hole 41.

[0043] In some embodiments of this utility model, a first groove can be provided on the cover 43 and a second groove can be provided on the base. The openings of the first groove and the second groove are opposite to each other. After the cover 43 is placed on the connecting seat 42, the first groove and the second groove form a limiting hole 41.

[0044] In some embodiments of this utility model, the connecting seat 42 includes a seat body 421, a first buckle 422 and a second buckle 423, a limiting groove 4211 is disposed on the seat body 421, and the first buckle 422 and the second buckle 423 are respectively located at both ends of the seat body 421 along the third direction Y; the cover 43 includes a cover plate 431, a first connecting arm 432 and a second connecting arm 433, the first connecting arm 432 and the second connecting arm 433 are respectively disposed at both ends of the cover plate 431 along the third direction Y; the first connecting arm 432 and the second connecting arm 433 form an installation space 434, the first connecting arm 432 has a first slot 4321, the second connecting arm 433 has a second slot 4331, the first buckle 422 is fastened to the first slot 4321, and the second buckle 423 is fastened to the second slot 4331. The snap-fit ​​structure of the buckle and the slot does not require additional fasteners. During assembly, simply align the cover 43 with the connecting seat 42 and press the cover 43 along the first direction Z so that at least part of the seat body 421 is inserted into the installation space 434, and the first buckle 422 is snapped into the first slot 4321 and the second buckle 423 is snapped into the second slot 4331. During disassembly, by slightly prying the first connecting arm 432 and the second connecting arm 433 outward, the first buckle 422 and the second buckle 423 can be disengaged from the first slot 4321 and the second slot 4331 respectively, which improves the efficiency of busbar 3 installation and maintenance.

[0045] Specifically, such as Figure 6 , Figure 7 As shown, the seat body 421 includes a connecting plate 4213, a third connecting arm 4214, and a fourth connecting arm 4215. The connecting plate 4213 is connected to the intermediate beam 2. The third connecting arm 4214 and the fourth connecting arm 4215 are respectively connected to the two sides of the connecting plate 4213 in the third direction Y. The gap between the third connecting arm 4214 and the fourth connecting arm 4215 forms a limiting groove 4211. The side of the third connecting arm 4214 away from the fourth connecting arm 4215 is the first side 42141, and the first buckle 422 is connected to the first side 42141. The side of the fourth connecting arm 4215 away from the third connecting arm 4214 is the second side 42151, and the second buckle 423 is connected to the second side 42151.

[0046] In some embodiments of this utility model, the cover 43 and the connecting seat 42 can be connected by a fastening connection.

[0047] To facilitate the connection of the connector 4 to the intermediate beam 2, in some embodiments of this utility model, such as Figures 5 to 8As shown, the connector 4 also includes a snap-fit ​​assembly 44. The snap-fit ​​assembly 44 is disposed on the side of the connector 42 facing away from the fixing part 33. The side of the intermediate beam 2 facing the connector 42 has a snap-fit ​​hole 21. The snap-fit ​​assembly 44 is inserted into the snap-fit ​​hole 21 to connect the connector 42 to the intermediate beam 2. The snap-fit ​​assembly 44 fixes the connector 42 to the intermediate beam 2 by inserting into the snap-fit ​​hole 21 of the intermediate beam 2, without relying on additional fasteners such as screws. During assembly, the snap-fit ​​assembly 44 is simply aligned with the snap-fit ​​hole 21 and inserted to complete the connection, simplifying the installation steps and improving assembly efficiency. The snap-fit ​​assembly 44 is mechanically locked with the snap-fit ​​hole 21, providing constraint to the side of the connector 42 facing away from the fixing part 33, preventing the connector 42 from loosening when the busbar 3 vibrates or the battery pack moves as a whole.

[0048] In some embodiments of this utility model, such as Figure 6 , Figure 7 As shown, the latching assembly 44 includes a protrusion 441 and a spring arm 443. One end of the protrusion 441 is connected to the connecting seat 42, and the other end is connected to the spring arm 443. The spring arm 443 is engaged in the latching hole 21 and is used to prevent the protrusion 441 from disengaging from the latching hole 21 along the first direction Z. Specifically, when the latching assembly 44 is inserted into the latching hole 21 of the intermediate beam 2, the spring arm 443 will pass through the latching hole 21 by its own elastic deformation. After it is fully inserted, the spring arm 443 returns to its original shape and is engaged in the latching hole 21. The spring arm 443 can form a reverse block from the inside of the latching hole 21, preventing the protrusion 441 from disengaging from the latching hole 21 along the first direction Z, thereby fixing the connecting seat 42 to the intermediate beam 2.

[0049] In some embodiments of this utility model, such as Figure 4 , Figure 6 As shown, the buckle assembly 44 also includes an elastic clamping member 442. The elastic clamping member 442 is located between the connecting seat 42 and the intermediate beam 2, and its two ends, which are opposite each other along the first direction Z, are connected to the connecting seat 42 and the intermediate beam 2 respectively. The elastic clamping member 442 is spaced apart from the protrusion 441 and the spring arm 443 respectively. Specifically, one end of the elastic clamping member 442 in the first direction Z is connected to the connecting seat 42, and the other end in the first direction Z abuts against the intermediate beam 2. The elastic clamping member 442 can reduce the shaking of the connecting seat 42 in the first direction Z, ensuring that the relative position of the connecting seat 42 and the intermediate beam 2 in the first direction Z remains stable. When the battery pack vibrates or is impacted, the elastic clamping member 442 can absorb part of the vibration energy through its own deformation, playing a buffering role and reducing the rigid collision between the connecting seat 42 and the intermediate beam 2, thereby slowing down the shaking of the fixing part 33 in the first direction Z. The setting of the elastic clamping member 442 makes the connecting part 4 not only have a connecting function, but also a buffering function for the busbar 3.

[0050] In some embodiments of this utility model, such as Figure 4As shown, the battery pack also includes an anti-wear sleeve 7, which passes through the limiting hole 41 and is fitted onto the fixing part 33. Specifically, the anti-wear sleeve 7 forms an isolation buffer layer between the fixing part 33 and the limiting hole 41. During the vibration of the busbar 3, the fixing part 33 and the inner wall of the limiting hole 41 will rub against each other. The anti-wear sleeve 7 is made of a wear-resistant material such as rubber or engineering plastic. The anti-wear sleeve 7 bears the frictional force between the two and avoids wear and tear on the fixing part 33 or the connector 4 due to long-term friction.

[0051] In some embodiments of this utility model, the battery pack further includes a second buffer 52; along the first direction Z, the second buffer 52 is at least partially located between the busbar 3 and the cover 11; and along the second direction X, the second buffer 52 is located between the fixing part 33 and the first end 31, and / or between the fixing part 33 and the second end 32. The second buffer 52 limits the side of the busbar 3 facing the cover 11, and the busbar 3 is sandwiched between the first buffer 51 and the second buffer 52 in the first direction Z, limiting the bidirectional vibration amplitude of the busbar 3 in the first direction Z.

[0052] There are various ways to arrange the first buffer 51, the second buffer 52, and the busbar 3. In some embodiments of this utility model, such as... Figure 9 As shown, both the first buffer 51 and the second buffer 52 are strip-shaped foams, and both the first buffer 51 and the second buffer 52 are attached to the busbar 3.

[0053] In some embodiments of this utility model, such as Figure 10 As shown, the second buffer 52 is connected to the first buffer 51, and the first buffer 51 and the second buffer 52 are integrally formed. Specifically, an insulating sleeve 8 is provided on the outside of the busbar 3. The portion of the insulating sleeve 8 located between the busbar 3 and the cover 11 forms the second buffer 52, and the portion of the insulating sleeve 8 located between the busbar 3 and the battery cell 6 forms the first buffer 51. In this case, by making the insulating sleeve 8 relatively thick and using the insulating sleeve 8 to form the first buffer 51 and the second buffer 52, the connection structure between the first buffer 51, the second buffer 52 and the busbar 3 is simplified, the number of parts is reduced, and the assembly complexity is lowered.

[0054] In some embodiments of this utility model, the insulating sleeve 8 can be made thinner, the first buffer 51 is set separately, at least a portion of the insulating sleeve 8 is located between the first buffer 51 and the busbar 3, and the portion of the insulating sleeve 8 located between the first buffer 51 and the busbar 3 serves as an intermediate layer between the busbar 3 and the first buffer 51, mainly undertaking the function of electrical insulation, and also participating in the buffering process through its own material properties.

[0055] In some embodiments of this utility model, at least a portion of the insulating sleeve 8 is located between the second buffer 52 and the busbar 3. The portion of the insulating sleeve 8 located between the second buffer 52 and the busbar 3 serves as an intermediate layer between the busbar 3 and the second buffer 52, mainly undertaking the function of electrical insulation, and also participating in the buffering process through its own material properties.

[0056] In some embodiments of this utility model, such as Figure 11 As shown, the first buffer 51 is connected to the side of the insulating sleeve 8 facing the battery unit 6, and the second buffer 52 is connected to the side of the insulating sleeve 8 facing the cover 11. In this embodiment, the portion of the insulating sleeve 8 between the first buffer 51 and the busbar 3, together with the first buffer 51, buffers the busbar 3; the portion of the insulating sleeve 8 between the second buffer 52 and the busbar 3, together with the second buffer 52, buffers the busbar 3. The first buffer 51 and the second buffer 52 are bonded to the outside of the insulating sleeve 8. In this embodiment, the insulating sleeve 8 can be made relatively thin. The insulating sleeve 8 serves as an intermediate layer between the busbar 3 and the first buffer 51 and the second buffer 52, mainly undertaking the function of electrical insulation, and also participating in the buffering process through its own material properties; the first buffer 51 and the second buffer 52 enhance vibration absorption capacity. When the first buffer 51 is bonded to the outside of the insulating sleeve 8, the connection strength between the first buffer 51 and the insulating sleeve 8 is defined as the first connection strength. When the first buffer 51 is bonded to the outside of the busbar 3, the connection strength between the first buffer 51 and the busbar 3 is the second connection strength. Since the material properties of the insulating sleeve 8 and the first buffer 51 are similar, the first connection strength is higher than the second connection strength. Therefore, the setting of the insulating sleeve 8 can also enhance the connection strength between the first buffer 51 and the second buffer 52 and the busbar 3.

[0057] In summary, the battery pack of this utility model provides support and buffering for the middle part of the busbar 3 through the intermediate beam 2 and the connecting member 4. The battery unit 6 and the cover 11 provide support and buffering for the busbar 3 through the arrangement of the first buffer member 51, the second buffer member 52 and the insulating sleeve 8. The battery pack of this application has a wide distribution of support and buffering nodes for the busbar 3, which reduces the vibration amplitude of the busbar 3 during use or testing.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack having a first direction (Z), a second direction (X), and a third direction (Y) that are perpendicular to each other, characterized in that, It includes a housing (1), a middle beam (2), a busbar (3), a first buffer (51), and a battery unit (6); The housing (1) includes a housing body (12) and a housing cover (11). The housing body (12) has an opening (121) on one side along the first direction (Z). The housing cover (11) covers the opening (121), and the housing cover (11) and the housing body (12) enclose a receiving cavity (13). The intermediate beam (2) is disposed in the receiving cavity (13) and connected to the housing body (12). The intermediate beam (2) extends along the third direction (Y) and divides the receiving cavity (13) into a first cavity (131) and a second cavity (132). The battery unit (6) is disposed in the first cavity (131) and the second cavity (132). The busbar (3) extends along the second direction (X) and has a first end (31) and a second end (32) opposite to each other. The first end (31) and the second end (32) are both fixed to the box body (12). The busbar (3) also has a fixing part (33), which is located between the first end (31) and the second end (32) and connected to the intermediate beam (2). Along the first direction (Z), the first buffer (51) is located between the busbar (3) and the battery cell (6); and along the second direction (X), the first buffer (51) is located between the fixing part (33) and the first end (31), and / or, the first buffer (51) is located between the fixing part (33) and the second end (32).

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a connector (4), which includes a connector (42) and a cover (43). The connector (42) is connected to the intermediate beam (2), and the cover (43) covers the connector (42) and the two together enclose a limiting hole (41). The fixing part (33) passes through the limiting hole (41).

3. The battery pack according to claim 2, characterized in that, The connecting seat (42) has a limiting groove (4211) extending along the second direction (X); The cover (43) is detachably connected to the connecting seat (42) along the first direction (Z) and covers the limiting groove (4211), and the cover (43) and the limiting groove (4211) together form the limiting hole (41).

4. The battery pack according to claim 3, characterized in that, The connecting seat (42) includes a seat body (421), a first buckle (422) and a second buckle (423), the limiting groove (4211) is disposed on the seat body (421), and the first buckle (422) and the second buckle (423) are respectively located at both ends of the seat body (421) along the third direction (Y); The cover (43) includes a cover plate (431), a first connecting arm (432) and a second connecting arm (433). The first connecting arm (432) and the second connecting arm (433) are respectively disposed at both ends of the cover plate (431) along the third direction (Y). The first connecting arm (432) has a first slot (4321), and the second connecting arm (433) has a second slot (4331). The first buckle (422) is fastened to the first slot (4321), and the second buckle (423) is fastened to the second slot (4331).

5. The battery pack according to claim 2, characterized in that, The connector (4) also includes a snap-fit ​​assembly (44); The buckle assembly (44) is disposed on the side of the connecting seat (42) away from the fixing part (33). The middle beam (2) has a buckle hole (21) on the side facing the connecting seat (42). The buckle assembly (44) is inserted into the buckle hole (21) so that the connecting seat (42) is connected to the middle beam (2).

6. The battery pack according to claim 5, characterized in that, The latching assembly (44) includes a protrusion (441) and a spring arm (443); One end of the protrusion (441) is connected to the connecting seat (42), and the other end is connected to the spring arm (443). The spring arm (443) is engaged in the locking hole (21) and is used to prevent the protrusion (441) from disengaging from the locking hole (21) along the first direction (Z).

7. The battery pack according to claim 6, characterized in that, The buckle assembly (44) further includes an elastic clamping member (442), which is connected to the connecting seat (42) and the intermediate beam (2) at opposite ends along the first direction (Z), and the elastic clamping member (442) is spaced apart from the protrusion (441) and the spring arm (443).

8. The battery pack according to claim 2, characterized in that, The battery pack also includes an anti-wear sleeve (7), which passes through the limiting hole (41) and is fitted onto the fixing part (33).

9. The battery pack according to claim 1, characterized in that, The battery pack further includes a second buffer (52); along the first direction (Z), the second buffer (52) is at least partially located between the busbar (3) and the cover (11); and along the second direction (X), the second buffer (52) is located between the fixing part (33) and the first end (31), and / or between the fixing part (33) and the second end (32).

10. The battery pack according to claim 9, characterized in that, The battery pack also includes an insulating sleeve (8), at least a portion of which is located between the first buffer (51) and the busbar (3), and / or, at least a portion of which is located between the second buffer (52) and the busbar (3).

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