Fixing structure of power battery module and lower box body

Abstract

The utility model relates to the technical field of vehicle power battery packs, in particular to a fixing structure of a power battery module and a lower box body, which comprises the battery module and the lower box body, and further comprises a connecting piece, a box body connecting bolt and a module connecting bolt, and the adjacent ends of the battery module and the lower box body are connected through the connecting piece; one end of the connecting piece is fixed at the side part of the lower box body through a box body connecting bolt, and the other end of the connecting piece is fixed at the side part of the battery module through a module connecting bolt; the adjacent ends of the battery module and the lower box body are connected through the connecting piece, one end of the connecting piece is fixed on the side part of the lower box body through the box body connecting bolt, and the other end of the connecting piece is fixed on the side part of the battery module through the module connecting bolt, so that the connecting strength between the lower box body and the battery module is effectively improved; the modal characteristics are improved, so that the battery pack can better resist destructive force when being collided, the overall structural integrity of the battery pack is protected, and the safety guarantee of passengers and a vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle power battery packs, and in particular to a fixing structure of a power battery module and a lower box. Background Art

[0002] Automotive power battery packs are typically composed of dozens or hundreds of battery cells, or cells connected in series and parallel. These cells are then typically connected in series and parallel to form a secondary module, or battery module. A battery module typically consists of battery cells, foam, thermal insulation pads, front and rear module end plates, a middle end plate, steel tie straps, plastic-steel straps, or side end plates. The battery module is typically secured to the power battery pack by inserting a long screw through a waist-shaped through-hole on the module end plate, locking the rivet nut on the battery pack's lower case, and securing it to the lower case. For example, CN207800725U discloses a quick-fix structure for a battery pack module that uses this method to secure the battery module.

[0003] As described above, the power battery module is secured by long screws that pass through waist-shaped through-holes on the module end plates and connect to rivet nuts on the lower case of the battery pack. While this method facilitates assembly and disassembly, in extreme circumstances, such as a vehicle collision, the long screws may not be able to withstand the severe external forces, causing them to deform or even break. Once the screws break, not only can the battery module be displaced and the overall structure of the battery pack be damaged, but more seriously, the broken screws may also pierce the battery cells, causing safety incidents such as short circuits, fires, or even explosions, posing a significant threat to the vehicle and its occupants. Utility Model Content

[0004] In view of this, the utility model proposes a fixing structure for the power battery module and the lower box body, which connects the adjacent ends of the battery module and the lower box body through a connecting plate, and fixes one end of the connecting plate to the side of the lower box body through a box body connecting bolt, and fixes the other end to the side of the battery module through a module connecting bolt, effectively improving the connection strength between the lower box body and the battery module, and improving the modal characteristics, so that the battery pack can better resist destructive force when encountering a collision, thereby protecting the overall structural integrity of the battery pack and improving the safety of the occupants and the vehicle.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] The utility model provides a fixing structure of a power battery module and a lower box, comprising a battery module and a lower box, wherein:

[0007] The battery module is arranged on the inner side of the lower box;

[0008] It also includes connecting plates, box connecting bolts and module connecting bolts, among which,

[0009] The battery module is connected to adjacent ends of the lower box through the connecting piece;

[0010] One end of the connecting piece is fixed to the side of the lower box body through the box body connecting bolts, and the other end is fixed to the side of the battery module through the module connecting bolts.

[0011] On the basis of the above technical solution, preferably, the box connecting bolts and the module connecting bolts are arranged vertically.

[0012] On the basis of the above technical solution, preferably, the connecting piece is provided with two first through holes vertically penetrating therethrough, wherein:

[0013] The screw end of the box connecting bolt passes through one of the first through holes, and the screw end of the module connecting bolt passes through the other first through hole.

[0014] On the basis of the above technical solution, preferably, it further includes a rivet nut, wherein,

[0015] A second through hole is vertically provided on the battery module at a position corresponding to the module connecting bolt, and the screw end of the module connecting bolt passes through the second through hole;

[0016] The rivet nut is screwed onto the screw end of the module connecting bolt and abuts against the lower end of the second through hole.

[0017] On the basis of the above technical solution, preferably, an avoidance gap is reserved between the lower end of the rivet nut and the bottom of the lower box body.

[0018] On the basis of the above technical solution, preferably, it further includes a positioning seat and a short bolt, wherein,

[0019] The positioning seat is fixed to the inner side of the lower box body and corresponds to the position of the box body connecting bolt by the short bolt;

[0020] A first threaded hole is provided on the top of the positioning seat, and the first threaded hole is threadedly connected to the screw end of the box body connecting bolt.

[0021] On the basis of the above technical solution, preferably, the positioning seat extends vertically into a long rectangular shape, wherein:

[0022] A flange is provided on each of the two vertical sides of the positioning seat, and a third through hole is provided in the transverse direction along the upper edge of the flange;

[0023] The screw end of the short bolt passes through the third through hole and is screwed to the side wall of the lower box body.

[0024] On the basis of the above technical solution, preferably, the upper ends of the two flanges extend upward and form a positioning groove on the top of the positioning seat; wherein,

[0025] One end of the connecting piece is arranged on the inner side of the positioning groove.

[0026] On the basis of the above technical solution, preferably, the transverse width of one end of the connecting piece located inside the positioning groove is smaller than the transverse width of the other end.

[0027] On the basis of the above technical solution, preferably, a positioning protrusion is provided on the side of the positioning seat, wherein the positioning protrusion is embedded on the inner side wall of the lower box body.

[0028] The fixing structure of the power battery module and the lower box of the present invention has the following advantages compared with the prior art:

[0029] (1) By arranging the adjacent ends of the battery module and the lower box body to be connected by a connecting plate, and fixing one end of the connecting plate to the side of the lower box body through the box body connecting bolts, and the other end of the connecting plate to the side of the battery module through the module connecting bolts, the connection strength between the lower box body and the battery module is effectively improved, and the modal characteristics are improved, so that the battery pack can better resist destructive force when encountering a collision, thereby protecting the overall structural integrity of the battery pack and improving the safety of the occupants and the vehicle.

[0030] (2) The rivet nut is screwed onto the screw end of the module connecting bolt and abuts against the lower end of the second through hole, and an avoidance gap is reserved between the lower end of the rivet nut and the bottom of the lower box body, so that the rivet nut and the module connecting bolt do not directly contact the lower box body. Therefore, when hit by external force, the module connecting bolt will not be directly impacted. Therefore, the module connecting bolt is not easy to break and is not easy to pierce the battery module, which is beneficial to protecting the overall structural integrity of the battery pack and improving the safety of the occupants and the vehicle.

[0031] (3) By setting the lateral width of one end of the connecting piece on the inner side of the positioning groove to be smaller than the lateral width of the other end, the installation and positioning of the connecting piece is facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1This is a three-dimensional diagram of the fixing structure of a power battery module and a lower box body of the utility model;

[0034] Figure 2 This is an enlarged view of point A of the present utility model;

[0035] Figure 3 It is a three-dimensional diagram at point A of the present invention;

[0036] Figure 4 It is a partial three-dimensional diagram of the utility model;

[0037] Figure 5 It is a partial exploded view of the utility model;

[0038] In the figure: 1. battery module; 2. lower box; 3. connecting plate; 4. box connecting bolt; 5. module connecting bolt; 6. rivet nut; 7. positioning seat; 8. short bolt; 101. second through hole; 301. first through hole; 701. first threaded hole; 702. flange; 703. third through hole; 704. positioning groove; 705. positioning protrusion. DETAILED DESCRIPTION

[0039] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] like Figure 1-5 As shown, a fixing structure of a power battery module and a lower box body of the present invention includes a battery module 1, a lower box body 2, a connecting piece 3, a box body connecting bolt 4 and a module connecting bolt 5.

[0041] Among them, the battery module 1 is arranged on the inner side of the lower box body 2, and the adjacent ends of the battery module 1 and the lower box body 2 are connected by a connecting plate 3. One end of the connecting plate 3 is fixed to the side of the lower box body 2 through a box body connecting bolt 4, and the other end is fixed to the side of the battery module 1 through a module connecting bolt 5.

[0042] like Figure 1 As shown, a number of connecting plates 3 are provided around the battery module 1, and the several connecting plates 3 are fixed between the battery module 1 and the lower box body 2 using the above-mentioned installation method. This structure can effectively improve the connection strength between the lower box body 2 and the battery module 1, improve the modal characteristics, and enable the battery pack to better resist destructive force when encountering a collision, thereby protecting the overall structural integrity of the battery pack and improving the safety of the occupants and the vehicle.

[0043] In the above structure, if Figure 3 and Figure 5 As shown, the box connecting bolts 4 and the module connecting bolts 5 are arranged vertically, and two first through holes 301 are vertically penetrated on the connecting piece 3. The screw end of the box connecting bolt 4 passes through one of the first through holes 301, and the screw end of the module connecting bolt 5 passes through the other first through hole 301. When installing the box connecting bolts 4 and the module connecting bolts 5, they are respectively inserted into the corresponding first through holes 301, and then screwed to the corresponding battery module 1 and the lower box 2.

[0044] The battery module 1 and the module connecting bolt 5 are connected by rivet nuts 6. Specifically, Figure 3 As shown, a second through hole 101 is vertically provided on the battery module 1 at the position corresponding to the module connecting bolt 5, and the screw end of the module connecting bolt 5 passes through the second through hole 101; the rivet nut 6 is screwed on the screw end of the module connecting bolt 5 and abuts against the lower end of the second through hole 101.

[0045] After the rivet nut 6 is fixed, an avoidance gap is reserved between its lower end and the bottom of the lower box 2, and the size of the gap is 10mm to 30mm. When the module connecting bolt 5 is fixed with the rivet nut 6, the lower end of the rivet nut 6 does not contact the lower box 2. Therefore, when the bottom of the lower box 2 is hit by external force, the module connecting bolt 5 is not easily hit by external force, so the module connecting bolt 5 is not easy to break. Compared with a quick-type fixing structure of a battery pack module disclosed in the prior art CN207800725U, since the module connecting bolt 5 is not easy to break, it is not easy to cause displacement of the battery module 1, it is not easy to damage the overall structure of the battery pack, and it is not easy to cause the battery cell to be punctured to cause short circuit, fire or even explosion, etc., providing reliable protection for the vehicle and its occupants.

[0046] The lower box body 2 and the box body connecting bolts 4 are connected and fixed by positioning seats 7 and short bolts 8. Figure 3 As shown, the positioning seat 7 is fixed to the inner side of the lower box body 2 and corresponds to the position of the box body connecting bolt 4 by a short bolt 8; a first threaded hole 701 is provided on the top of the positioning seat 7, and the first threaded hole 701 is threadedly connected to the screw end of the box body connecting bolt 4. Through this structure, the screw of the box body connecting bolt 4 can be hidden inside the positioning seat 7 and wrapped by it. When the battery pack is hit, the short bolt 8 is not easy to break, and it is not easy to cause the battery cell to be punctured and cause short circuit, fire or even explosion, etc., providing reliable protection for the vehicle and its occupants.

[0047] like Figure 3 As shown, the positioning seat 7 extends vertically into a long rectangular shape, wherein, as shown in FIG. Figure 4As shown, a flange 702 is provided on each side of the positioning seat 7 in the vertical direction, and a third through hole 703 is provided horizontally on the upper edge of the flange 702; the screw end of the short bolt 8 passes through the third through hole 703 and is screwed to the side wall of the lower box body 2. Correspondingly, an internal threaded hole for installing the short bolt 8 is provided on the side of the lower box body 2. This structure facilitates the installation of the positioning seat 7, and the contact area between the positioning seat 7 and the lower box body 2 is increased by the flange 702, thereby improving the stability after connection.

[0048] like Figure 5 As shown, in order to prevent the positioning seat 7 from being positioned during installation, a positioning protrusion 705 is provided on the side of the positioning seat 7, wherein the positioning protrusion 705 is embedded in the inner wall of the lower box body 2. Specifically, a hole is opened on the inner wall of the lower box body 2 at the position corresponding to the positioning protrusion 705. When installing the positioning seat 7, the positioning protrusion 705 is embedded in the hole to achieve positioning, and then the positioning seat 7 is fixed to the inner side of the lower box body 2 by the short bolt 8.

[0049] like Figure 3 As shown, in order to facilitate the installation and positioning of the connecting piece 3, the upper ends of the two flanges 702 extend upward and form a positioning groove 704 on the top of the positioning seat 7; wherein, one end of the connecting piece 3 is arranged on the inner side of the positioning groove 704; the lateral width of the end of the connecting piece 3 inside the positioning groove 704 is smaller than the lateral width of the other end, that is: the connecting piece 3 is wide at one end and narrow at the other end, and is in a convex shape. When the connecting piece 3 needs to be installed, as shown in FIG. Figure 5 As shown, the small end of the connecting piece 3 is placed in the positioning groove 704 , and then the screw end of the box connecting bolt 4 is passed through the first through hole 301 and then screwed to the first threaded hole 701 .

[0050] In addition, in the fixing structure between the battery module and the lower box, Figure 3 As shown, the lower box body 2 is a profile welded structure, and the profile parts are welded together by CMT or MIG welding. The material is AL6061-T6, which makes the structural strength of the lower box body 2 higher; Figure 3 As shown, a module end plate is fixed to the side of the battery module 1 through a steel belt, and a second through hole 101 is provided on the module end plate to improve the structural strength of the battery module 1.

[0051] The method of using the fixing structure of a power battery module and a lower box body of the utility model is as follows:

[0052] Fix one end of the connecting piece 3 on the lower box body 2. During the process, first place the small end of the connecting piece 3 into the positioning groove 704, then pass the screw end of the box connecting bolt 4 through the first through hole 301 at one end of the connecting piece 3, and screw the screw end of the box connecting bolt 4 on the first threaded hole 701. Then, fix the other end of the connecting piece 3 on the battery module 1. During the process, pass the screw end of the module connecting bolt 5 through the first through hole 301 at the other end of the connecting piece 3, and pass the screw end of the module connecting bolt 5 through the second through hole 101. Then, screw the rivet nut 6 on the lower end of the screw end of the module connecting bolt 5 and tighten it. After completing the installation of multiple connecting pieces 3 using the above steps, the battery module 1 and the lower box body 2 are fixedly connected.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fixing structure for a power battery module and a lower box, comprising a battery module (1) and a lower box (2), wherein: The battery module (1) is arranged on the inner side of the lower box (2); It is characterized in that it also includes a connecting piece (3), a box connecting bolt (4) and a module connecting bolt (5), wherein: The battery module (1) and the adjacent ends of the lower box (2) are connected via the connecting piece (3); One end of the connecting piece (3) is fixed to the side of the lower box (2) via the box connecting bolt (4), and the other end is fixed to the side of the battery module (1) via the module connecting bolt (5).

2. The fixing structure of a power battery module and a lower box according to claim 1, characterized in that: The box connecting bolts (4) and the module connecting bolts (5) are arranged vertically.

3. The fixing structure of a power battery module and a lower box according to claim 2, characterized in that: The connecting piece (3) is provided with two first through holes (301) vertically extending therethrough, wherein: The screw end of the box connecting bolt (4) passes through one of the first through holes (301), and the screw end of the module connecting bolt (5) passes through the other first through hole (301).

4. The fixing structure of a power battery module and a lower box according to claim 1, characterized in that: Also included is a rivet nut (6), wherein: A second through hole (101) is vertically provided on the battery module (1) at a position corresponding to the module connecting bolt (5), and the screw end of the module connecting bolt (5) passes through the second through hole (101); The rivet nut (6) is screwed onto the screw end of the module connecting bolt (5) and abuts against the lower end of the second through hole (101).

5. The fixing structure of the power battery module and the lower box according to claim 4, characterized in that: An escape gap is reserved between the lower end of the rivet nut (6) and the bottom of the lower box body (2).

6. The fixing structure of a power battery module and a lower box according to claim 1, characterized in that: It also includes a positioning seat (7) and a short bolt (8), wherein: The positioning seat (7) is fixed to the inner side of the lower box (2) and at a position corresponding to the box connecting bolt (4) by the short bolt (8); A first threaded hole (701) is provided on the top of the positioning seat (7), and the first threaded hole (701) is threadedly connected to the screw end of the box connecting bolt (4).

7. The fixing structure of a power battery module and a lower box according to claim 6, characterized in that: The positioning seat (7) extends vertically into a long rectangular shape, wherein: A flange (702) is provided on each of the two vertical sides of the positioning seat (7), and a third through hole (703) is provided on the flange (702) in the transverse direction; The screw end of the short bolt (8) passes through the third through hole (703) and is screwed to the side wall of the lower box body (2).

8. The fixing structure of a power battery module and a lower box according to claim 7, characterized in that: The upper ends of the two flanges (702) extend upward and form a positioning groove (704) on the top of the positioning seat (7); wherein, One end of the connecting piece (3) is arranged on the inner side of the positioning groove (704).

9. The fixing structure of the power battery module and the lower box according to claim 8, characterized in that: The transverse width of one end of the connecting piece (3) located inside the positioning groove (704) is smaller than the transverse width of the other end.

10. The fixing structure of a power battery module and a lower box according to claim 6, characterized in that: A positioning protrusion (705) is provided on the side of the positioning seat (7), wherein the positioning protrusion (705) is embedded on the inner side wall of the lower box body (2).

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