Busbar fixing structure and battery pack

Abstract

The utility model discloses a busbar fixing structure and a battery pack, and relates to the technical field of batteries, the busbar fixing structure comprises a busbar and a plastic fixing piece, the thickness of the busbar extends along the Z direction, the plastic fixing piece comprises a fixing seat, a first connector and a second connector, and the first connector and the second connector are respectively arranged on two sides of the fixing seat along the Z direction in a protruding manner. A fixing hole is formed in the busbar in the Z direction in a penetrating mode, the first connector can penetrate through the fixing hole and is fixedly connected with the busbar in a clamped mode, and the second connector can penetrate through a connecting hole in the battery box or the support and is fixedly connected with the battery box or the support in a clamped mode. By adopting the busbar fixing structure, the fixing rigidity of the busbar can be improved, and the installation stability of the busbar is prevented from being influenced by shaking.

Description

Technical Field

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

[0002] The bus bar in the battery pack usually needs to be fixed. The conventional fixing method is to use a connector (aircraft head or fir tree head) in cooperation with an industrial cable tie, or to use an integrated connector cable tie structure. The connector is fixed at the corresponding mounting hole of the box body or the bracket, and the cable tie is fixed along the outer periphery of the cross section of the bus bar and tightened through the buckle matching structure of the cable tie.

[0003] When fixing the bus bar in the above way, the following problems exist:

[0004] The cable tie itself is a soft fixing, and there is a gap between the cable tie and the bus bar after the cable tie is wound around the bus bar, resulting in poor stability of the bus bar, large shaking amplitude of the bus bar, and low overall stiffness. Summary of the Utility Model

[0005] The purpose of the embodiments of the utility model is to provide a bus bar fixing structure and a battery pack, which can improve the fixing stiffness of the bus bar 1 and avoid the influence of the shaking of the bus bar on its installation stability.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] On the one hand, a bus bar fixing structure is provided, including a bus bar, the thickness of the bus bar extends along the Z direction, and further includes a plastic fixing member, the plastic fixing member includes a fixing seat, a first connector and a second connector, the first connector and the second connector respectively protrude from both sides of the fixing seat along the Z direction, the bus bar is provided with a fixing hole penetrating along the Z direction, the first connector can pass through the fixing hole and be fixedly connected with the bus bar by clamping, and the second connector can pass through the connection hole on the battery box or the bracket and be fixedly connected with the battery box or the bracket by clamping.

[0008] As a further solution of the bus bar fixing structure, it further includes an insulating annular rubber sleeve, the insulating annular rubber sleeve is sleeved on the outer periphery of the first connector, the first connector can pass through the fixing hole and make both sides of the bus bar along the Z direction respectively abut against the insulating annular rubber sleeve and the first connector, and the side of the insulating annular rubber sleeve away from the bus bar abuts against the fixing seat.

[0009] As a further solution for the busbar fixing structure, the fixing base includes a first abutting portion, a second abutting portion, and an intermediate connecting member. The two sides of the intermediate connecting member along the Z direction are respectively connected to the first abutting portion and the second abutting portion. The first connecting head is connected to the central position of the first abutting portion, the second connecting head is connected to the central position of the second abutting portion, the insulating annular rubber sleeve abuts against the side of the first abutting portion close to the busbar, and when the second connecting head passes through the connecting hole on the battery box or the bracket, the battery box or the bracket abuts against the second abutting portion.

[0010] As a further solution for the busbar fixing structure, the first abutting portion has a first flat portion at the central position and a first inclined portion connected to the outer periphery of the first flat portion. One end of the first inclined portion away from the first flat portion extends in a direction away from the intermediate connecting member to form an inverted umbrella shape. The second abutting portion has a second flat portion at the central position and a second inclined portion connected to the outer periphery of the second flat portion. One end of the second inclined portion away from the second flat portion extends in a direction away from the intermediate connecting member to form an umbrella shape. The first flat portion corresponds to the second flat portion, the first flat portion is connected to the first connecting head, the second flat portion is connected to the second connecting head, the intermediate connecting member is respectively connected to the first inclined portion and the second inclined portion, the insulating annular rubber sleeve abuts against the first inclined portion, and the battery box or the bracket abuts against the second inclined portion.

[0011] As a further solution for the busbar fixing structure, the intermediate connecting member includes a first connecting block and a second connecting block arranged at intervals in the X direction perpendicular to the Z direction. The first connecting block is parallel to the second connecting block. The first connecting block and the second connecting block are symmetrically arranged between the first abutting portion and the second abutting portion. The two sides of the first connecting block and the second connecting block along the Z direction are respectively adjacent to the first flat portion and the second flat portion, and the two sides of the first connecting block along the Z direction and the two sides of the second connecting block along the Z direction are respectively connected to the first inclined portion and the second inclined portion.

[0012] As a further solution for the busbar fixing structure, the inner diameter of the insulating annular rubber sleeve is respectively larger than the outer diameter of the first connecting head, the outer diameter of the first inclined portion, and the diameter of the fixing hole.

[0013] As a further solution for the busbar fixing structure, both the first connector and the second connector are in the shape of a fir tree head. The first connector includes a first connection body and a plurality of first clamping portions annularly arranged on the outer periphery of the first connection body. The second connector includes a second connection body and a plurality of second clamping portions annularly arranged on the outer periphery of the second connection body. The first connection body is connected to the central position of the first planar portion, and the second connection body is connected to the central position of the second planar portion. The first connection body has a clearance fit with the fixing hole, and the first connector can pass through the fixing hole so that both side surfaces of the busbar in the Z direction are respectively abutted against the insulating annular rubber sleeve and one of the first clamping portions. The second connection body has a clearance fit with the connection hole, and the second connector can pass through the connection hole so that both side surfaces of the battery box or the bracket in the Z direction are respectively abutted against the second inclined portion and one of the second clamping portions.

[0014] As a further solution for the busbar fixing structure, a plurality of first notches extending from the edge of the first clamping portion to the first connection body are formed in the first clamping portion, and a plurality of second notches extending from the edge of the second clamping portion to the second connection body are formed in the second clamping portion.

[0015] As a further solution for the busbar fixing structure, one of the first notches extends from the edge of the first clamping portion to the center of the first connection body, and the length of this first notch extends in the Z direction to be close to the first planar portion. One of the second notches extends from the edge of the second clamping portion to the center of the second connection body, and the length of this second notch extends in the Z direction to be close to the second planar portion.

[0016] On the other hand, a battery pack is provided, which includes a box body and a battery module installed in the box body. The box body is provided with a connection hole, and further includes the busbar fixing structure as described above. The busbar of the busbar fixing structure is connected to the battery cells of the battery module, and the second connector of the plastic fixing member of the busbar fixing structure is clamped with the connection hole.

[0017] Advantageous effects:

[0018] In the present utility model, the plastic fixing member is designed as a double-connector structure, and at the same time, a fixing hole is formed in the busbar. The two connectors of the plastic fixing member can be respectively clamped and fixed with the fixing hole on the busbar and the connection hole on the box body or the bracket. Compared with the existing method of using a cable tie in cooperation with a fir tree head structure to fix the busbar, the busbar fixing structure of the present utility model can improve the fixing stiffness of the busbar and avoid the influence of the shaking of the busbar on its installation stability.

[0019] In the present utility model, an insulating annular rubber sleeve is sleeved on the outer periphery of the first connection head of the plastic fixing member. The first connection head can pass through the fixing hole and make the busbar abut against the insulating annular rubber sleeve and the first connection head respectively. The insulating annular rubber sleeve can provide a certain pre-tightening force for the busbar, so that the busbar, the insulating annular rubber sleeve and the plastic fixing member are tightly connected into a whole through the pre-tightening force, greatly improving the fixing rigidity of the busbar.

[0020] Compared with the existing fixing with cable ties, the plastic fixing member of the present utility model only needs to apply pressure and install by aligning the fixing hole on the busbar and the connection hole on the box body or bracket, without trimming the cable ties, making the fixing of the busbar more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0022] Figure 1 It is a schematic structural diagram of the busbar fixing structure according to an embodiment of the present utility model.

[0023] Figure 2 It is an exploded schematic diagram of the busbar fixing structure according to an embodiment of the present utility model.

[0024] Figure 3 It is a top view schematic diagram of the plastic fixing member according to an embodiment of the present utility model.

[0025] Figure 4 is Figure 3 A sectional view of the plastic fixing member along the A-A direction.

[0026] Figures 1-4 In the figure:

[0027] 1. Busbar; 11. Fixing hole;

[0028] 2. Fixing seat; 21. First abutting portion; 211. First flat portion; 212. First inclined portion; 22. Second abutting portion; 221. Second flat portion; 222. Second inclined portion; 23. Intermediate connecting member; 231. First connecting block; 232. Second connecting block;

[0029] 3. First connection head; 31. First connection main body; 32. First clamping portion; 33. First notch;

[0030] 4. Second connection head; 41. Second connection main body; 42. Second clamping portion; 43. Second notch;

[0031] 5. Insulating annular rubber sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present utility model clearer, the technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "above and to the left" of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the right", and "below and to the left" of the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0035] In the description of this embodiment, if terms such as "above", "below", "left", and "right" indicating orientation or position relationship appear, they are all based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first" and "second" appear, they are only used for distinction in description and have no special meaning.

[0036] Such as Figures 1 to 3As shown in the figure, this embodiment provides a busbar fixing structure, which includes a busbar 1 and a plastic fixing member. The thickness of the busbar 1 extends in the Z direction. The plastic fixing member includes a fixing base 2, a first connector 3 and a second connector 4. The first connector 3 and the second connector 4 respectively protrude from both sides of the fixing base 2 along the Z direction. The busbar 1 is provided with a fixing hole 11 penetrating along the Z direction. The first connector 3 can pass through the fixing hole 11 and be fixedly connected to the busbar 1 by clamping, and the second connector 4 can pass through the connection hole on the battery box or the bracket and be fixedly connected to the battery box or the bracket by clamping.

[0037] In this embodiment, the plastic fixing member is designed as a double-connector structure, that is, a first connector 3 and a second connector 4 are respectively arranged on both sides of the fixing base 2 along the Z direction. At the same time, a fixing hole 11 is opened on the busbar 1. The first connector 3 can pass through the fixing hole 11 and be fixedly connected to the busbar 1 by clamping, and the second connector 4 can pass through the pre-opened connection hole on the battery box or the bracket and be fixedly connected to the battery box or the bracket by clamping. Compared with the existing structure of using cable ties to cooperate with the fir tree head to fix the busbar 1, the busbar fixing structure of this embodiment can improve the fixing stiffness of the busbar 1 and avoid the influence of the shaking of the busbar 1 on its installation stability.

[0038] Among them, the first connector 3 and the second connector 4 can be of fir tree head structure or airplane head structure. Next, taking the first connector 3 and the second connector 4 adopting the fir tree head structure as an example, the busbar fixing structure of the present invention will be described in detail.

[0039] Optionally, the busbar 1 can be a copper bar or an aluminum bar, etc.

[0040] Furthermore, the busbar fixing structure of this embodiment further includes an insulating annular rubber sleeve 5. The insulating annular rubber sleeve 5 is sleeved on the outer periphery of the first connector 3. The first connector 3 can pass through the fixing hole 11 and make both sides of the busbar 1 along the Z direction abut against the insulating annular rubber sleeve 5 and the first connector 3 respectively. The side of the insulating annular rubber sleeve 5 away from the busbar 1 abuts against the fixing base 2. Since the fixing base 2 is made of plastic material, after the insulating annular rubber sleeve 5 is sleeved on the outer periphery of the first connector 3, the first connector 3 is passed through the fixing hole 11 on the busbar 1, so that the busbar 1 presses one side of the insulating annular rubber sleeve 5 along the Z direction and is clamped with the first connector 3. At this time, the insulating annular rubber sleeve 5 can provide a certain pre-tightening force for the busbar 1, so that the busbar 1, the insulating annular rubber sleeve 5 and the plastic fixing member are tightly connected into a whole through the pre-tightening force, greatly improving the fixing stiffness of the busbar.

[0041] In this embodiment, the plastic fixing member is integrally injection molded.

[0042] In this embodiment, the insulating annular rubber sleeve 5 is made of an elastic insulating and flame-retardant material. Optionally, the insulating annular rubber sleeve 5 is made of silicone rubber material.

[0043] Further, the fixing base 2 includes a first abutting portion 21, a second abutting portion 22 and an intermediate connecting member 23. The two sides of the intermediate connecting member 23 in the Z direction are respectively connected to the first abutting portion 21 and the second abutting portion 22. The first connecting head 3 is connected to the central position of the first abutting portion 21, the second connecting head 4 is connected to the central position of the second abutting portion 22, the insulating annular rubber sleeve 5 abuts against one side of the first abutting portion 21 close to the bus bar 1, and when the second connecting head 4 passes through the connecting hole on the battery box or the bracket, the battery box or the bracket abuts against the second abutting portion 22.

[0044] By arranging the first abutting portion 21 and the second abutting portion 22 at intervals, a certain pre-tightening force can be provided for the clamping and fixing between the bus bar 1 and the first connecting head 3 by the first abutting portion 21, and a certain pre-tightening force can be provided for the clamping and fixing between the second connecting head 4 and the box body or the bracket by the second abutting portion 22.

[0045] Further, the first abutting portion 21 has a first flat portion 211 at the central position and a first inclined portion 212 connected to the outer periphery of the first flat portion 211. One end of the first inclined portion 212 away from the first flat portion 211 extends in a direction away from the intermediate connecting member 23 to form an inverted umbrella shape. The second abutting portion 22 has a second flat portion 221 at the central position and a second inclined portion 222 connected to the outer periphery of the second flat portion 221. One end of the second inclined portion 222 away from the second flat portion 221 extends in a direction away from the intermediate connecting member 23 to form an umbrella shape. The first flat portion 211 corresponds to the second flat portion 221. The first flat portion 211 is connected to the first connecting head 3, the second flat portion 221 is connected to the second connecting head 4, the intermediate connecting member 23 is respectively connected to the first inclined portion 212 and the second inclined portion 222, the insulating annular rubber sleeve 5 abuts against the first inclined portion 212, and the battery box or the bracket abuts against the second inclined portion 222.

[0046] In this embodiment, the first abutting portion 21 and the second abutting portion 22 are respectively designed as umbrella-shaped structures, and the first connecting head 3 is connected to the central position of the first flat portion 211 of the first abutting portion 21, and the second connecting head 4 is connected to the central position of the second flat portion 221 of the second abutting portion 22. When the insulating annular rubber sleeve 5 abuts against the first inclined portion 212, the first inclined portion 212 has sufficient deformation space, so that the insulating annular rubber sleeve 5 can provide sufficient pre-tightening force for the bus bar 1; similarly, when the second connecting head 4 passes through the connecting hole on the box body or the bracket, the second inclined portion 222 has sufficient deformation space to provide sufficient pre-tightening force for the box body or the bracket.

[0047] Optionally, the intermediate connecting member 23 includes a first connecting block 231 and a second connecting block 232 that are spaced apart in the X direction perpendicular to the Z direction. The first connecting block 231 is parallel to the second connecting block 232. The first connecting block 231 and the second connecting block 232 are symmetrically arranged between the first abutting portion 21 and the second abutting portion 22. The two sides of the first connecting block 231 and the second connecting block 232 in the Z direction are respectively adjacent to the first flat portion 211 and the second flat portion 221, and the two sides of the first connecting block 231 in the Z direction and the two sides of the second connecting block 232 in the Z direction are respectively connected to the first inclined portion 212 and the second inclined portion 222.

[0048] The first connecting block 231 and the second connecting block 232 are respectively connected to be adjacent to the first flat portion 211 and the second flat portion 221 and are connected to the first inclined portion 212 and the second inclined portion 222, which can provide sufficient supporting force for the first abutting portion 21 and the second abutting portion 22, and prevent the first inclined portion 212 and the second inclined portion 222 from being excessively deformed and affecting the pre-tightening effect.

[0049] In other embodiments, the intermediate connecting member 23 may also be a ring structure, such as a circular ring structure. When adopting the circular ring structure, the outer periphery of the intermediate connecting member 23 is adjacent to the first inclined portion 212 and the second inclined portion 222. In this embodiment, the inner diameter of the insulating annular rubber sleeve 5 is respectively larger than the outer diameter of the first connector 3, the outer diameter of the first inclined portion 212, and the diameter of the fixing hole 11, which can enable the insulating annular rubber sleeve 5 to have sufficient contact area with the bus bar 1 and the first inclined portion 212 respectively, and improve the pre-tightening effect. And the inner diameter of the insulating annular rubber sleeve 5 is respectively larger than the outer diameter of the first connector 3, which can enable the insulating annular rubber sleeve 5 to be smoothly sleeved on the outer periphery of the first connector 3.

[0050] Specifically, the insulating annular rubber sleeve 5 is a circular ring structure, and the outer peripheries of the first flat portion 211 and the first inclined portion 212 are both circular, and the outer peripheries of the second flat portion 221 and the second inclined portion 222 are both circular.

[0051] Furthermore, one side of the first inclined portion 212 close to the bus bar 1 and adjacent to the edge position is a planar structure parallel to the bus bar 1. When the bus bar 1 is clamped and fixed with the first connector 3, this planar structure is in surface contact with the insulating annular rubber sleeve 5, increasing the contact area between the first abutting portion 21 and the insulating annular rubber sleeve 5; one side of the second inclined portion 222 far from the bus bar 1 and adjacent to the edge position is a planar structure parallel to the bus bar 1. When the second connector 4 passes through the connection hole and is clamped and fixed with the box body or the bracket, this planar structure is in surface contact with the box body or the bracket, increasing the contact area between the second abutting portion 22 and the box body or the bracket.

[0052] Among them, both the first connector 3 and the second connector 4 are fir-tree head structures. Specifically, the first connector 3 includes a first connection body 31 and a plurality of first clamping portions 32 disposed around the outer periphery of the first connection body 31. The second connector 4 includes a second connection body 41 and a plurality of second clamping portions 42 disposed around the outer periphery of the second connection body 41. The first connection body 31 is connected to the central position of the first planar portion 211, and the second connection body 41 is connected to the central position of the second planar portion 221. The first connection body 31 has a clearance fit with the fixing hole 11. The first connector 3 can pass through the fixing hole 11, and both side surfaces of the busbar 1 along the Z direction are respectively abutted against the insulating annular rubber sleeve 5 and one of the first clamping portions 32. The second connection body 41 has a clearance fit with the connection hole. The second connector 4 can pass through the connection hole, and both side surfaces of the battery box or the bracket along the Z direction are respectively abutted against the second inclined portion 222 and one of the second clamping portions 42.

[0053] Since the first connector 3 and the second connector 4 adopt the fir-tree head structure, when the first connector 3 passes through the fixing hole 11 on the busbar 1, pressure can be applied to the first connector 3 in the direction towards the busbar 1, so that both sides of the busbar 1 along the Z direction are respectively abutted against the insulating annular rubber sleeve 5 and one of the first clamping portions 32, thereby improving the clamping stability between the first connector 3 and the busbar 1. Similarly, when the second connector 4 passes through the connection hole on the box body or the bracket, pressure can be applied to the second connector 4 in the direction away from the busbar 1, so that both sides of the box body or the bracket along the Z direction are respectively abutted against the second inclined portion 222 and one of the second clamping portions 42.

[0054] In this embodiment, the diameter of the first clamping portion 32 along the X direction is larger than the diameter of the fixing hole 11. When the first connector 3 passes through the fixing hole 11 on the busbar 1, the first clamping portion 32 will be deformed by the extrusion of the fixing hole 11. If the clearance between the first connection body 31 and the fixing hole 11 is too small, it will hinder the first connector 3 from passing through the fixing hole 11 smoothly. Similarly, the diameter of the second clamping portion 42 along the X direction is larger than the diameter of the connection hole. When the second connector 4 passes through the connection hole on the box body or the bracket, the second clamping portion 42 will be deformed by the extrusion of the connection hole. If the clearance between the second connection body 41 and the connection hole is too small, it will hinder the second connector 4 from passing through the connection hole smoothly.

[0055] In order to enable the first connector 3 to pass through the fixing hole 11 smoothly and the second connector 4 to pass through the connection hole smoothly, notches are respectively provided on the outer peripheries of the first connector 3 and the second connector 4 in this embodiment.

[0056] Specifically, the first clamping portion 32 is provided with a plurality of first notches 33 extending from its edge to the first connecting body 31. By providing the first notches 33, when the first connector 3 is inserted into the fixing hole 11 on the bus bar 1, the first connector 3 will be deformed under extrusion, and the provision of the first notches 33 can enable the first connector 3 to have sufficient deformation space, so that the first connector 3 can smoothly pass through the fixing hole 11. The second clamping portion 42 is provided with a plurality of second notches 43 extending from its edge to the second connecting body 41. When the second connector 4 passes through the connecting hole on the box body or the bracket, the second connector 4 can be deformed under extrusion, and the provision of the second notches 43 can enable the second connector 4 to have sufficient deformation space, so that the second connector 4 can smoothly pass through the connecting hole.

[0057] Further, one of the first notches 33 extends from the edge of the first clamping portion 32 to the center of the first connecting body 31, and the length of this first notch 33 extends along the Z direction to be close to the first planar portion 211. One of the second notches 43 extends from the edge of the second clamping portion 42 to the center of the second connecting body 41, and the length of this second notch 43 extends along the Z direction to be close to the second planar portion 221.

[0058] When the first connector 3 passes through the fixing hole 11, the first clamping portion 32 is deformed under extrusion and will simultaneously squeeze the first connecting body 31. In this embodiment, by extending one of the first notches 33 from the edge of the first clamping portion 32 to the center of the first connecting body 31, deformation space can be provided for the extrusion received by the first connecting body 31, further reducing the resistance received by the first connector 3 when passing through the fixing hole 11. Similarly, when the second connector 4 passes through the connecting hole, the second clamping portion 42 is deformed under extrusion and will simultaneously squeeze the second connecting body 41. In this embodiment, by extending one of the second notches 43 from the edge of the second clamping portion 42 to the center of the second connecting body 41, deformation space can be provided for the extrusion received by the second connecting body 41, further reducing the resistance received by the second connector 4 when passing through the connecting hole.

[0059] Specifically, as Figure 4 shown, the first connecting body 31 is of a cylindrical structure, and the end thereof far from the fixing seat 2 is similar to a conical structure. The number of the first notches 33 is two, and the two first notches 33 are respectively located on both sides of the first connector 3 in the radial direction. One of the first notches 33 extends from the edge of the first clamping portion 32 to the center of the first connecting body 31. Similarly, the second connecting body 41 is of a cylindrical structure, and the end thereof far from the fixing seat 2 is similar to a conical structure. The number of the second notches 43 is two, and the two second notches 43 are respectively located on both sides of the second connector 4 in the radial direction. One of the second notches 43 extends from the edge of the second clamping portion 42 to the center of the first connecting body 31.

[0060] In this embodiment, the length of the first connecting body 31 in the Z direction and the length of the second connecting body 41 in the Z direction can both be determined according to the actual situation. Specifically, the arrangement density of the first clamping portion 32 in the Z direction can be determined according to the thickness of the bus bar 1, and the arrangement density of the second clamping portion 42 in the Z direction can be determined according to the thickness of the plate body at the connection hole opened on the box body or the bracket. Details are not described herein again.

[0061] Compared with the existing cable tie fixation, the plastic fixing member of this embodiment only needs to apply pressure and install it by aligning the fixing hole 11 on the bus bar 1 and the connection hole on the box body or the bracket, without trimming the cable tie, and the fixation of the bus bar 1 is more convenient.

[0062] The plastic fixing member of this embodiment can be made into standard parts of different sizes for selection and use, that is, a standard part corresponding to a corresponding size is designed for the fixing holes 11 and connection holes in different size ranges respectively.

[0063] The plastic fixing member of this embodiment is not limited to being applied to the fixation of the bus bar 1, and is equally applicable to the fixation of other thin plate parts with similar structures.

[0064] This embodiment also provides a battery pack (not shown in the figure), which includes a box body, a battery module installed in the box body, and a bus bar fixing structure as described in the above embodiment. The box body is provided with a connection hole. The bus bar of the bus bar fixing structure is connected to the battery cells of the battery module, and the second connection head 4 of the plastic fixing member of the bus bar fixing structure is clamped with the connection hole.

[0065] In other embodiments, when the bus bar 1 is too long, a plurality of fixing holes 11 need to be opened on the bus bar 1, and a plastic fixing member is clamped and fixed at each fixing hole 11. When the number of connection holes on the box body is insufficient or the opening position of the connection holes is limited, it is also necessary to fix a bracket in the box body, open a connection hole on the bracket, and pass the second connection head 4 of the plastic fixing member through the connection hole on the bracket for clamping and fixing.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A busbar fixing structure, comprising a busbar, wherein the thickness of the busbar extends along the Z direction, and is characterized in that: It also includes a plastic fixing part, which includes a fixing base, a first connecting head and a second connecting head. The first connecting head and the second connecting head are respectively protruded on both sides of the fixing base along the Z direction. The bus is penetrated by a fixing hole along the Z direction. The first connecting head can pass through the fixing hole and be fixed to the bus. The second connecting head can pass through the connecting hole on the battery box or the bracket and be fixed to the battery box or the bracket.

2. The busbar fixing structure according to claim 1, characterized in that: It also includes an insulating annular rubber sleeve, which is sleeved on the outer periphery of the first connector. The first connector can pass through the fixing hole and make the two sides of the bus along the Z direction respectively abut against the insulating annular rubber sleeve and the first connector, and the side of the insulating annular rubber sleeve away from the bus abuts against the fixing seat.

3. The busbar fixing structure according to claim 2, characterized in that: The fixing seat includes a first abutting portion, a second abutting portion and an intermediate connecting member, the intermediate connecting member is respectively connected to the first abutting portion and the second abutting portion on both sides along the Z direction, the first connecting head is connected to the center position of the first abutting portion, the second connecting head is connected to the center position of the second abutting portion, the insulating annular rubber sleeve abuts against a side of the first abutting portion close to the bus, and when the second connecting head passes through the connecting hole on the battery box or the bracket, the battery box or the bracket abuts against the second abutting portion.

4. The busbar fixing structure according to claim 3, characterized in that: The first abutting portion comprises a first plane portion located at a central position and a first inclined portion connected to the periphery of the first plane portion, an end of the first inclined portion away from the first plane portion extends in an inverted umbrella shape toward a direction away from the intermediate connecting member, the second abutting portion comprises a second plane portion located at a central position and a second inclined portion connected to the periphery of the second plane portion, an end of the second inclined portion away from the second plane portion extends in an umbrella shape toward a direction away from the intermediate connecting member, the first plane portion corresponds to the second plane portion, the first plane portion is connected to the first connecting head, the second plane portion is connected to the second connecting head, the intermediate connecting member is respectively connected to the first inclined portion and the second inclined portion, the insulating annular rubber sleeve abuts against the first inclined portion, and the battery box or the bracket abuts against the second inclined portion.

5. The busbar fixing structure according to claim 4, characterized in that: The intermediate connecting member includes a first connecting block and a second connecting block arranged at intervals along an X direction perpendicular to the Z direction, the first connecting block is parallel to the second connecting block, the first connecting block and the second connecting block are symmetrically arranged between the first abutting portion and the second abutting portion, the first connecting block and the second connecting block are adjacent to the first planar portion and the second planar portion on both sides along the Z direction, and the first connecting block and the second connecting block are connected to the first inclined portion and the second inclined portion on both sides along the Z direction.

6. The busbar fixing structure according to claim 4, characterized in that: The inner diameter of the insulating annular rubber sleeve is respectively larger than the outer diameter of the first connector, the outer diameter of the first inclined portion, and the diameter of the fixing hole.

7. The busbar fixing structure according to any one of claims 4 to 6, characterized in that: The first connecting head and the second connecting head are both of fir tree head structure, the first connecting head includes a first connecting body and a plurality of first clamping parts arranged around the outer circumference of the first connecting body, the second connecting head includes a second connecting body and a plurality of second clamping parts arranged around the outer circumference of the second connecting body, the first connecting body is connected to the center position of the first plane part, and the second connecting body is connected to the center position of the second plane part; the first connecting body is gap-matched with the fixing hole, the first connecting head can pass through the fixing hole and make the two side surfaces of the busbar along the Z direction respectively abut against the insulating annular rubber sleeve and one of the first clamping parts; the second connecting body is gap-matched with the connecting hole, the second connecting head can pass through the connecting hole and make the two side surfaces of the battery box or the bracket along the Z direction respectively abut against the second inclined part and one of the second clamping parts.

8. The busbar fixing structure according to claim 7, characterized in that: The first clamping portion is provided with a plurality of first notches extending from its edge to the first connecting body, and the second clamping portion is provided with a plurality of second notches extending from its edge to the second connecting body.

9. The busbar fixing structure according to claim 8, characterized in that: One of the first notches extends from the edge of the first clamping portion to the center of the first connecting body, and the length of the first notch extends along the Z direction to close to the first planar portion; one of the second notches extends from the edge of the second clamping portion to the center of the second connecting body, and the length of the second notch extends along the Z direction to close to the second planar portion.

10. A battery pack, comprising a box and a battery module installed in the box, characterized in that: It also includes the bus fixing structure described in any one of claims 1-9, the box body is provided with a connecting hole, the bus of the bus fixing structure is connected to the battery cell of the battery module, and the second connector of the plastic fixing part of the bus fixing structure is snap-fitted to the connecting hole.

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