Battery box body
By setting vertical and horizontal sections on the bushing of the battery box and limiting the product relationship between the distance between the two ends of the notch and the elastic modulus, the problem of unstable fixation caused by bushing deformation was solved, and a stable connection between the cover and the box body and efficient assembly were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-03-31
AI Technical Summary
In existing battery packs, bushings are prone to deformation after notches are set, which makes it difficult for bolts to effectively secure the cover and the body, affecting connection stability and assembly efficiency.
Vertical and horizontal sections are provided on the side wall of the bushing. By limiting the product relationship between the minimum distance between the two ends of the notch and the elastic modulus of the horizontal section, direct contact between the fastener and the cover is avoided, thus preventing bushing deformation and ensuring the fixing effect.
This effectively prevents bushing deformation during use, ensures a stable connection between the fasteners and the housing and cover, and improves assembly efficiency and connection stability.
Smart Images
Figure CN224067806U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, concretely relates to battery box. BACKGROUND
[0002] In the battery pack, the box cover and the box body are generally fixed and installed through bolt cooperation with the bushing, the bushing can reduce the damage of the bolt to the box cover during the bolt fixing process, and the fixing effect of the bolt is improved.
[0003] The existing bushing is mostly fixed with the box cover through interference fit or threaded connection, wherein the interference fit can cause the deformation of the bushing, affecting the bolt installation, and the threaded installation is relatively troublesome and has low assembly efficiency, therefore, a notch can be formed on the bushing to facilitate the installation of the bushing in the through hole of the box cover after the deformation of the bushing.
[0004] However, the notch formed on the bushing is prone to stress concentration, and the local stress of the bushing can exceed the yield strength when the bolt is tightened, causing the deformation of the bushing, and after the deformation of the bushing, the flatness of the contact surface between the bushing and the bolt is reduced, the bolt cannot uniformly press the bushing, and the connection stability of the box cover and the box body is poor. SUMMARY
[0005] Therefore, the utility model provides a battery box to solve the problem that the battery pack adopts the bolt and the bushing to fix the box cover and the box body, and the notch formed on the bushing is prone to cause the deformation of the bushing, and the bolt cannot effectively fix the box cover and the box body.
[0006] The utility model provides a battery box, which comprises:
[0007] a box body;
[0008] a box cover provided with a first through hole;
[0009] a bushing arranged in the first through hole, wherein the bushing is provided with a second through hole and a notch on the side wall;
[0010] a fixing member penetrating through the first through hole and the second through hole to fixedly connect the box cover and the box body;
[0011] The bushing comprises a vertical section and a flat section, the vertical section is located in the first through hole, the flat section is arranged on the side of the vertical section away from the box body, the flat section extends away from the vertical section along the plane where the box cover is located, the flat section is at least partially located between the fixing member and the box cover, and the notch penetrates through the vertical section and the flat section along the thickness direction of the box cover.
[0012] The minimum distance between the two end faces forming the notch is L1, the elastic modulus of the flat section is E1, and 140mm*GPa≤L1*E1≤270mm*GPa is satisfied.
[0013] The battery box has the following beneficial effects: the bushing is arranged in the first through hole of the box cover, the fixing member penetrates through the bushing and is fixedly connected with the box cover and the box body, the vertical section and the flat section are arranged in the bushing, the flat section is at least partially located between the fixing member and the box cover, direct contact between the fixing member and the box cover is avoided, and damage of the fixing member to the box cover is reduced. The notch is arranged on the side wall of the bushing, and the product of the minimum distance between the two end faces of the notch and the elastic modulus of the flat section is limited, so that the bushing is conveniently installed in the first through hole, meanwhile, the bushing is prevented from being extruded by the fixing member in the use process, the two end faces of the notch are prevented from being in contact with each other and deformed, the flatness of the flat section is ensured, and the fixing effect of the fixing member on the box body and the box cover is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.
[0015] Figure 1 It is a structural schematic view of a battery box of the embodiment of the present application.
[0016] Figure 2 It is a partial structural schematic view of a battery box of the embodiment of the present application.
[0017] Figure 3 It is a structural schematic view of a bushing of a battery box of the embodiment of the present application.
[0018] Figure 4 It is a top view of a bushing of a battery box of the embodiment of the present application.
[0019] Figure 5 It is a side view of a bushing of a battery box of the embodiment of the present application.
[0020] Figure 6 It is a bottom view of a bushing of a battery box of the embodiment of the present application.
[0021] BRIEF DESCRIPTION OF DRAWINGS
[0022] 1, box body; 2, box cover; 201, first through hole; 3, bushing; 301, second through hole; 302, notch; 303, vertical section; 304, flat section; 4, fixing member. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0024] The embodiments of the utility model will be described below in combination with Figures 1 to 6 .
[0025] According to the embodiments of the utility model, as shown in Figure 1 and Figure 2 , a battery box is provided, mainly comprising: a box body 1, a box cover 2, a bushing 3 and a fixing piece 4. The box cover 2 is provided with a first through hole 201. The bushing 3 is arranged in the first through hole 201, and the bushing 3 is provided with a second through hole 301 and a notch 302 on the side wall. The fixing piece 4 passes through the first through hole 201 and the second through hole 301 to fixedly connect the box cover 2 and the box body 1.
[0026] Further, as shown in Figure 3 , the bushing 3 comprises a vertical section 303 and a flat section 304, the vertical section 303 is located in the first through hole 201, the flat section 304 is arranged on the side of the vertical section 303 away from the box body 1, the flat section 304 extends along the plane where the box cover 2 is located to the side away from the vertical section 303, the flat section 304 is at least partially located between the fixing piece 4 and the box cover 2, and the notch 302 penetrates the vertical section 303 and the flat section 304 along the thickness direction of the box cover 2.
[0027] In the initial state, the minimum distance between the two end faces forming the notch 302 is L1, the elastic modulus of the flat section 304 is E1, and 140mm·GPa≤L1×E1≤270mm·GPa is satisfied.
[0028] It can be seen that the battery box provided by the utility model, the bushing 3 is arranged in the first through hole 201 of the box cover 2, the fixing member 4 passes through the bushing 3 and is fixedly connected with the box cover 2 and the box body 1, the bushing 3 is provided with a vertical section 303 and a flat section 304, the flat section 304 is at least partially located between the fixing member 4 and the box cover 2, direct contact between the fixing member 4 and the box cover 2 can be avoided, and thus damage of the fixing member 4 to the box cover 2 is reduced. By arranging the notch 302 in the side wall of the bushing 3 and limiting the product relationship between the minimum distance between the two end faces of the notch 302 and the elastic modulus of the flat section 304, the bushing 3 is facilitated to be installed in the first through hole 201, meanwhile, the bushing 3 is prevented from being extruded by the fixing member 4 in the use process, the two end faces at the notch 302 are prevented from being in contact with each other and deformed, the flatness of the flat section 304 is facilitated to be ensured, and thus the fixing effect of the fixing member 4 on the box body 1 and the box cover 2 is ensured.
[0029] If L1x E1 is less than 140mm·GPa, in the process that the fixing member 4 fixes the box body 1 and the box cover 2, the fixing member 4 will extrude the two end faces of the notch 302 of the bushing 3, the flatness of the flat section 304 is reduced, and thus the fixing effect of the fixing member 4 is affected. If L1x E1 is greater than 270mm·GPa, in the process that the fixing member 4 fixes the box body 1 and the box cover 2, the fixing member 4 is easy to damage the box cover 2 due to the existence of the notch 302.
[0030] Exemplarily, in the utility model embodiment, the value of L1x E1 can be 140mm·GPa, 180mm·GPa, 220mm·GPa, 250mm·GPa, 270mm·GPa and the like.
[0031] It should be noted that the greater the elastic modulus E1 of the flat section 304, the harder the material of the flat section 304, and the more difficult the deformation is, and thus the distance L1 between the two end faces of the notch 302 can be correspondingly reduced. The utility model can effectively balance the material of the flat section 304 and the size of the notch 302 by limiting the product of the distance L1 and the elastic modulus E1 of the flat section 304, so that the bushing 3 is facilitated to be installed while the bushing 3 is prevented from affecting the fixing effect of the fixing member 4.
[0032] The conventional battery box is generally installed by adopting the interference fit of the C-shaped bushing and the bolt, the height of the C-shaped bushing is greater than the height of the box cover, the upper end of the C-shaped bushing is higher than the box cover, and a gap is left between the box cover and the bolt. After the bolt is fastened, the bolt is in contact with the bushing 3 and presses down the box cover 2. Since the push-off force of the bushing 3 and the box cover 2 is generally about 20N, the bushing 3 is easy to be separated from the box cover 2 in the actual use process.
[0033] The flat section 304 of the bushing 3 extends along the plane where the box cover 2 is located to the side away from the vertical section 303, and the vertical section 303 and the flat section 304 form a hollow cylindrical structure with a T-shaped section. After the bushing 3 is installed, if the bushing 3 has a tendency to separate from the box cover 2, the circumferential force of the fixing member 4 acts on the flat section 304, so that the box cover 2 is always in an axially compressed state, and thus the bushing 3 can be effectively prevented from separating from the first through hole 201 of the box cover 2.
[0034] It should be noted that the bushing 3 is elastic, and the bushing 3 is installed in the first through hole 201 after being extruded and deformed. The initial state refers to the natural state of the bushing 3 before being installed in the first through hole 201. Figure 4
[0035] It should be noted that the structure and material of the fixing member 4 are not limited in the embodiment of the utility model, and any existing fixing member can be selected as needed. For example, the fixing member 4 is a metal fixing bolt, which includes a stainless steel bolt, an iron bolt, etc. The first through hole 201 and the second through hole 301 are circular holes or threaded holes.
[0036] In addition, the connection relationship between the vertical section 303 and the flat section 304 of the bushing 3 is not limited in the embodiment of the utility model, for example, the vertical section 303 and the flat section 304 are integrally formed, which is convenient for installation and use.
[0037] It can be understood that the box cover 2 and the fixing member 4 in the embodiment of the utility model can be made of any existing material as needed, for example, the box cover 2 can be made of at least one of stainless steel, iron, aluminum, aluminum alloy, PCM (phase change) material, etc. In addition, the bushing 3 can be made of at least one of carbon steel, aluminum, steel, titanium alloy, etc.
[0038] In one embodiment, the fixing member 4 is an external hexagonal stainless steel bolt, the top of the external hexagonal stainless steel bolt is provided with a cap head, and the cap head completely covers the flat section 304 of the bushing 3. The box cover 2 is a stainless steel cover, and the bushing 3 is a carbon steel bushing.
[0039] In one embodiment, as shown in Figure 4 In the initial state, the minimum distance L1 between the two end faces forming the notch 302 is 0.7mm≤L1≤1.8mm. By limiting the distance L1 within the appropriate range, the installation of the bushing 3 is facilitated, and the fixing effect of the fixing member 4 is better. If L1 is greater than 1.8mm, the bushing 3 is easily deformed when the fixing member 4 is tightened, it is difficult to effectively transmit the axial pressure, and the sealing performance is poor. If L1 is less than 0.7mm, the bushing 3 is difficult to be installed in the first through hole 201.
[0040] In one embodiment, the elastic modulus E1 of the flat section 304 is in the range of 180 GPa≤E1≤220 GPa. By limiting E1 in the appropriate range, the installation of the bushing 3 is facilitated, and the fixing effect of the fixing member 4 is better. If E1 is greater than 220 GPa, the bushing 3 is too hard to be installed into the first through hole 201, and the sealing is prone to failure due to insufficient resilience of the bushing 3. If E1 is less than 180 GPa, the bushing 3 is prone to loosen during long-term use, resulting in poor fixing effect of the fixing member 4.
[0041] For example, in the embodiment of the utility model, the value of L1 is 0.8 mm, the value of E1 is 180 GPa, and the value of L1 x E1 can be 144 mm·GPa; or the value of L1 is 1 mm, the value of E1 is 200 GPa, and the value of L1 x E1 can be 200 mm·GPa; or the value of L1 is 1.2 mm, the value of E1 is 220 GPa, and the value of L1 x E1 can be 264 mm·GPa.
[0042] In one embodiment, the proportion of the overlapping area of the surface projection of the fixing member 4 on the surface of the box cover 2 and the surface projection of the flat section 304 on the surface of the box cover 2 to the area of the flat section 304 is S, and S is in the range of 0.4≤S≤1 and 180 mm·GPa≤L1 x E1≤270 mm·GPa. When S satisfies 0.4≤S≤1, the damage of the fixing member 4 to the box cover 2 can be reduced, and at this time, the minimum distance L1 between the two end faces forming the notch 302 needs to be increased in order to install the bushing 3, so the lower limit value of L1 x E1 is increased.
[0043] Specifically, the surface projection of the fixing member 4 on the surface of the box cover 2 and the surface projection of the flat section 304 on the surface of the box cover 2 refer to the projection in the height direction of the battery box body.
[0044] For example, in the embodiment of the utility model, the value of S can be 0.4, 0.7, 1, etc., and the corresponding value of L1 x E1 can be 180 mm·GPa, 225 mm·GPa, 270 mm·GPa, etc.
[0045] In one embodiment, as shown in FIG. 3, Figure 5 In one embodiment, as shown in FIG. 3,
[0046] For example, in the embodiment of the utility model, the value of T1 can be 0.2 mm, 1 mm, 2 mm, 3 mm, etc.
[0047] Further, in one embodiment, as shown in FIG. 3, Figure 6As shown, the thickness T2 of the vertical section 303 ranges from 0.2mm to 2mm. In the case that the bushing 3 is a hollow cylinder, the thickness of the vertical section 303 refers to the radial thickness. By limiting the thickness T2 of the vertical section 303 to range from 0.2mm to 2mm, the structural strength of the vertical section 303 can be increased to improve the protection capability of the vertical section 303 to the lid 2.
[0048] Exemplarily, in the embodiments of the utility model, the value of T2 can be 0.2mm, 1mm, 2mm, etc.
[0049] Further, in an embodiment, the thickness T1 of the flat section 304 is equal to the thickness T2 of the vertical section 303, so as to process the bushing 3.
[0050] In an embodiment, the elastic modulus E2 of the lid 2 is greater than the elastic modulus E3 of the bushing 3. The greater the elastic modulus, the harder the material. By making the elastic modulus E2 of the lid 2 greater than the elastic modulus E3 of the bushing 3, i.e. the bushing 3 is softer, the wear of the bushing 3 to the lid 2 can be reduced, and the damage to the lid 2 is further reduced.
[0051] In an embodiment, as shown, Figure 2 The lid 2 is provided with a plurality of first through holes 201 at intervals, and the interval between adjacent first through holes 201 is L2, which satisfies 80mm≤L2≤100mm. By providing a plurality of first through holes 201 on the lid 2, each first through hole 201 is provided with a bushing 3, and the fixing of the box body 1 and the lid 2 is completed by corresponding use of a plurality of fixing members 4 respectively penetrating through the corresponding bushings 3, the fixing stability of the box body 1 and the lid 2 can be improved. Adjacent first through holes 201 are prone to form a weak area, and the weak area is prone to stress concentration. By limiting the interval L2 between adjacent first through holes 201, the structural strength of the lid 2 between adjacent first through holes 201 can be improved to avoid damage to the lid 2 in this weak area.
[0052] Exemplarily, in the embodiments of the utility model, the value of L2 can be 80mm, 90mm, 100mm, etc.
[0053] In an embodiment, as shown, Figure 2 The interval between the first through hole 201 and the edge of the lid 2 is L3, which satisfies 2.5mm≤L3≤6mm. Similarly, the first through hole 201 to the edge of the lid 2 is also prone to form a weak area, and by limiting the interval between the first through hole 201 and the edge of the lid 2, the structural strength of the lid 2 between the first through hole 201 and the edge of the lid 2 can be improved to avoid damage to the lid 2 in this weak area.
[0054] Exemplarily, in the embodiments of the utility model, the value of L3 can be 2.5mm, 4mm, 6mm, etc.
[0055] It should be noted that the shape of the notch 302 of the bushing 3 is not limited in the embodiments of the present application, and any existing shape can be selected as needed.
[0056] In one embodiment, as shown in Figure 3 and Figure 4 When the bushing 3 is a hollow cylindrical shape, the notch 302 is a sector, and the second through hole 301 is a circular hole. At this time, the included angle formed by the notch 302 along the two sides of the circumferential direction of the second through hole 301 and the center of the second through hole 301 is θ, which satisfies 3°≤θ≤15°, and 600°·GPa≤θ×E1≤2200°·GPa.
[0057] Exemplarily, in the embodiments of the present application, the value of θ×E1 can be 600°·GPa, 800°·GPa, 1000°·GPa, 1300°·GPa, 1600°·GPa, 2000°·GPa, 2200°·GPa, etc.
[0058] In other embodiments, the notch 302 can also be a square, an arc, or other conventional shapes, and the specific settings can be selected according to actual needs, and the present application is not limited to too many restrictions.
[0059] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.
Claims
1. A battery case characterized by comprising: The box (1) comprises: a box cover (2) provided with a first through hole (201); a bushing (3) provided in the first through hole (201), the bushing (3) being provided with a second through hole (301) and a side wall provided with a notch (302); a fixing member (4) penetrating through the first through hole (201) and the second through hole (301) to fixedly connect the box cover (2) and the box (1); the bushing (3) comprises a vertical section (303) and a flat section (304), the vertical section (303) is located in the first through hole (201), the flat section (304) is provided on a side of the vertical section (303) away from the box (1), the flat section (304) extends away from the vertical section (303) along a plane on which the box cover (2) is located, the flat section (304) is at least partially located between the fixing member (4) and the box cover (2), and the notch (302) penetrates through the vertical section (303) and the flat section (304) along a thickness direction of the box cover (2); in an initial state, a minimum distance between two end faces forming the notch (302) is L1, and an elastic modulus of the flat section (304) is E1, satisfying 140mm·GPa≤L1×E1≤270mm·GPa. in the initial state, the minimum distance L1 between the two end faces forming the notch (302) is in a range of 0.7mm≤L1≤1.8mm; 2. The battery pack of claim 1, wherein and / or, the elastic modulus E1 of the flat section (304) is in a range of 180GPa≤E1≤220GPa. an overlapping area of a surface projection of the fixing member (4) on the box cover (2) and a surface projection of the flat section (304) on the box cover (2) accounts for a proportion S of an area of the flat section (304), and S is in a range of 0.4≤S≤1, 180mm·GPa≤L1×E1≤270mm·GPa.
3. The battery pack of claim 1, wherein, a thickness T1 of the flat section (304) is in a range of 0.2mm≤T1≤3mm along an extension direction of the vertical section (303).
4. The battery pack of claim 1, wherein, a thickness T2 of the vertical section (303) is in a range of 0.2mm≤T2≤2mm.
5. The battery pack of claim 4, wherein, the thickness T1 of the flat section (304) is equal to the thickness T2 of the vertical section (303).
6. The battery pack of claim 5, wherein, an elastic modulus E2 of the box cover (2) is greater than an elastic modulus E3 of the bushing (3).
7. The battery pack according to any one of claims 1 to 6, characterized by, a plurality of first through holes (201) are provided on the box cover (2) at intervals, and a distance L2 between adjacent first through holes (201) satisfies 80mm≤L2≤100mm.
8. The battery pack of any one of claims 1 to 6, wherein, a distance L3 between the first through hole (201) and an edge of the box cover (2) satisfies 2.5mm≤L3≤6mm.
9. The battery pack of any one of claims 1 to 6, wherein, the notch (302) is a sector, and an included angle θ formed between two sides of the notch (302) along a circumferential direction of the second through hole (301) and a center of the second through hole (301) satisfies 600°·GPa≤θ×E1≤2200°·GPa.
10. The battery pack of any one of claims 1 to 6, wherein,