BMS shell and PCBA fixing structure

Abstract

The utility model discloses a BMS (Battery Management System) shell and PCBA (Printed Circuit Board Assembly) fixing structure, which comprises a BMS shell, a PCBA, a stepped rivet and a bolt, the BMS shell comprises an upper shell body and a lower shell body, and the upper shell body and the lower shell body are connected to form a hollow cavity. The PCBA is accommodated in the hollow cavity, and a through hole is formed in the PCBA; the stepped rivet is arranged in at least part of the through hole in a penetrating manner, and a first positioning part for positioning the PCBA is arranged on the stepped rivet; and the bolt sequentially penetrates through the lower shell, the stepped rivet, the PCBA and the upper shell so as to be used for fixedly connecting the upper shell and the lower shell. The upper shell, the PCBA and the lower shell are fixedly connected together through the bolts, so that the connection strength and the assembly precision among the upper shell, the PCBA and the lower shell can be effectively improved, the assembly process can be optimized, and the assembly efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a BMS shell and PCBA fixing structure. Background Art

[0002] In the prior art, the housing of the battery management system (BMS) is mostly made of plastic material, which has problems such as low structural strength, easy cracking and deformation failure, weak electromagnetic shielding performance and heat dissipation performance. In addition, the upper housing and the lower housing in the housing composition of the existing battery management system are mostly connected by a snap-on method, which has problems such as low connection strength and easy breakage. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a BMS housing and PCBA fixing structure with high connection strength.

[0004] According to the BMS shell and PCBA fixing structure of the embodiment of the utility model, it includes: a BMS shell, a PCBA, a step rivet and a bolt; the BMS shell includes an upper shell and a lower shell, and the upper shell and the lower shell are connected to form a hollow cavity; the PCBA is accommodated in the hollow cavity, and a through hole is provided on the PCBA; the step rivet is penetrated through at least part of the through hole, and a first positioning portion for positioning the PCBA is provided on the step rivet; the bolt passes through the lower shell, the step rivet, the PCBA and the upper shell in sequence, so as to fix the upper shell and the lower shell together.

[0005] According to the BMS housing and PCBA fixing structure of the embodiment of the utility model, by using bolts to fix the upper housing, PCBA and lower housing together, not only the connection strength and assembly accuracy among the three can be effectively improved, but also the assembly process can be optimized and the assembly efficiency can be improved.

[0006] In addition, the BMS housing and PCBA fixing structure according to the utility model may also have the following additional technical features:

[0007] In some embodiments, the stepped rivet includes a first section and a second section connected axially, the first section is located at one end of the second section facing the upper shell, the diameter of the first section is greater than the diameter of the second section, the first positioning portion is a stepped surface constructed between the first section and the second section, the second section is penetrated through the through hole, and the PCBA overlaps the stepped surface.

[0008] In some embodiments, a second positioning portion is formed on a side of the lower housing facing the PCBA, the first positioning portion is positioned at one side of the PCBA, and the second positioning portion is positioned at the other side of the PCBA.

[0009] In some embodiments, the second positioning portion is a boss protruding toward the PCBA, and the boss abuts against the chip on the PCBA.

[0010] In some embodiments, the boss is stamped from the lower shell.

[0011] In some embodiments, the upper shell includes a bottom wall and a peripheral wall connected to the outer periphery of the bottom wall, and the bottom wall and the peripheral wall constitute the hollow cavity with an opening; the lower shell is used to cover the opening of the hollow cavity; wherein the peripheral wall is provided with a positioning groove, and the lower shell has a positioning flange folded toward the peripheral wall and adapted to the positioning groove.

[0012] In some embodiments, the positioning flange includes a first positioning flange extending along the length direction of the lower shell and a second positioning flange extending along the width direction of the lower shell, and the positioning groove includes a first positioning groove cooperating with the first positioning flange and a second positioning groove cooperating with the second positioning flange.

[0013] In some embodiments, the number of the step rivets is four, and the four step rivets are respectively located at four corners of the upper shell.

[0014] In some embodiments, the upper shell and the lower shell are both formed by stamping metal materials.

[0015] In some embodiments, the lower housing has a heat dissipation boss protruding toward the PCBA, the heat dissipation boss extends along the length direction of the lower housing, and a surface of the heat dissipation boss contacts a surface of the PCBA.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the upper housing (first perspective) of the BMS housing and PCBA fixing structure according to an embodiment of the utility model;

[0018] Figure 2 is a schematic diagram of an upper housing (second viewing angle) of a BMS housing and a PCBA fixing structure according to an embodiment of the utility model;

[0019] Figure 3 Schematic diagram of the lower housing of the BMS housing and PCBA fixing structure according to an embodiment of the utility model;

[0020] Figure 4It is an assembly diagram of the upper housing and PCBA of the BMS housing and PCBA fixing structure according to an embodiment of the utility model;

[0021] Figure 5 It is an assembly diagram of the BMS housing and the PCBA fixing structure (without bolts) according to an embodiment of the utility model;

[0022] Figure 6 It is an assembly diagram of a BMS housing and a PCBA fixing structure (first perspective) according to an embodiment of the utility model;

[0023] Figure 7 It is an assembly diagram of a BMS housing and a PCBA fixing structure (second viewing angle) according to an embodiment of the utility model;

[0024] Figure 8 Schematic diagram of the step rivet of the BMS housing and PCBA fixing structure according to the embodiment of the utility model.

[0025] Reference numerals:

[0026] 100. BMS housing and PCBA fixing structure;

[0027] 1. BMS housing; 11. upper housing; 12. lower housing; 111. bottom wall; 112. peripheral wall; 121. second positioning portion; 122. positioning flange; 123. heat dissipation boss; 1121. positioning groove; 1221. first positioning flange; 1222. second positioning flange; 11211. first positioning groove; 11212. second positioning groove;

[0028] 2. PCBA; 21. Through hole;

[0029] 3. Step rivet; 31. First positioning portion; 32. First section; 33. Second section;

[0030] 4. Bolt; 5. Open slot; 6. Mounting hole. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 8 A BMS housing and PCBA fixing structure 100 according to an embodiment of the present invention is described.

[0036] like Figures 1 to 8 As shown, the BMS shell and PCBA fixing structure 100 according to the embodiment of the utility model includes: a BMS shell 1, a PCBA2, a step rivet 3 and a bolt 4; the BMS shell 1 includes an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are connected to form a hollow cavity; the PCBA2 is accommodated in the hollow cavity, and a through hole 21 is provided on the PCBA2; the step rivet 3 is penetrated through at least part of the through hole 21, and the step rivet 3 is provided with a first positioning portion 31 for positioning the PCBA2; the bolt 4 passes through the lower shell 12, the step rivet 3, the PCBA2 and the upper shell 11 in sequence, so as to fix the upper shell 11 and the lower shell 12 in connection.

[0037] For example Figures 1 to 6As shown, the upper shell 11 and the lower shell 12 are assembled together to form the BMS (battery management system) shell as a whole, and the PCBA2 (printed circuit board) is installed in the hollow cavity in the BMS shell 1, wherein four through holes 21 are provided on the PCBA2, and four step rivets 3 are provided on the upper shell 11. The end of the step rivet 3 facing the PCBA2 is provided with a first positioning portion 31, and the first positioning portion 31 cooperates with the through hole 21 so that the step rivet 3 completes the positioning of the PCBA2. In this way, the installation accuracy of the PCBA2 can be guaranteed and the overall assembly efficiency can be improved.

[0038] Furthermore, four mounting holes 6 are provided on the lower shell 12, which are concentric with the four through holes 21 on the PCBA2. After the lower shell 12 is assembled with the upper shell 11, the four mounting holes 6 on the lower shell 12, the four through holes 21 on the PCBA2 and the four step rivets 3 on the upper shell 11 are all concentrically opposite to each other; when the upper shell 11, PCBA2 and the lower shell 12 are assembled, bolts 4 are used to pass through the mounting holes 6, the through holes 21 and the step rivets 3 in sequence to fix the upper shell 11, PCBA2 and the lower shell 12 together. In this way, the integrity and assembly accuracy of the three assemblies, as well as the connection strength between the three, can be effectively improved, thereby effectively preventing the upper shell 11, PCBA2 and the lower shell 12 from disconnecting and failing, thereby ensuring the stability of the BMS during operation.

[0039] According to the BMS housing and PCBA fixing structure 100 of the embodiment of the utility model, the upper housing 11, PCBA 2 and lower housing 12 are fixedly connected together by using bolts 4, which can not only effectively improve the connection strength and assembly accuracy among the three, but also optimize the assembly process and improve the assembly efficiency.

[0040] In one embodiment of the present invention, Figures 1 to 8 As shown, the stepped rivet 3 includes a first section 32 and a second section 33 connected in the axial direction, the first section 32 is located at one end of the second section 33 facing the upper shell 11, the diameter of the first section 32 is greater than the diameter of the second section 33, the first positioning portion 31 is a stepped surface constructed between the first section 32 and the second section 33, the second section 33 is inserted into the through hole 21, and the PCBA 2 overlaps the stepped surface. Figure 4 As shown, four through holes 21 are provided on PCBA2, and four step rivets 3 are provided on the upper shell 11. The four through holes 21 cooperate with the four step rivets 3 so that the first section 32 of the step rivet 3 is penetrated in the through hole 21, and the PCBA2 is overlapped on the step surface, thereby completing the positioning and assembly of the PCBA2. In this way, the first section 32 penetrated in the through hole 21 can limit the movement of the PCBA2 and prevent the position of the PCBA2 from being offset, thereby ensuring the installation accuracy of the PCBA2 and improving the assembly efficiency.

[0041] In one embodiment of the present invention, Figures 1 to 8 As shown, a second positioning portion 121 is formed on one side of the lower housing 12 facing the PCBA 2, the first positioning portion 31 is positioned on one side of the PCBA 2, and the second positioning portion 121 is positioned on the other side of the PCBA 2. In this embodiment, the second positioning portion 121 can cooperate with the PCBA 2 to further strengthen the positioning of the PCBA 2, making it less likely for the PCBA 2 to be displaced.

[0042] In a specific embodiment of the present invention, Figures 1 to 8 As shown, the second positioning portion 121 is a boss protruding toward PCBA2, and the boss abuts against the chip on PCBA2. In this way, the first positioning portion 31 positions one side of PCBA2, and the boss positions the other side of PCBA2. Through bidirectional positioning, the installation stability of PCBA2 can be guaranteed.

[0043] In some embodiments, the boss is stamped from the lower shell 12 , so that the boss and the lower shell 12 are designed as one piece, which can effectively enhance the structural strength of the boss.

[0044] In one embodiment of the present invention, Figures 1 to 8 As shown, the upper shell 11 includes a bottom wall 111 and a peripheral wall 112 connected to the outer periphery of the bottom wall 111, and the bottom wall 111 and the peripheral wall 112 form a hollow cavity with an opening; the lower shell 12 is used to cover the opening of the hollow cavity; wherein the peripheral wall 112 is provided with a positioning groove 1121, and the lower shell 12 has a positioning flange 122 folded toward the peripheral wall 112 and adapted to the positioning groove 1121. In this embodiment, when the upper shell 11 and the lower shell 12 are assembled, the positioning flange 122 on the lower shell 12 can be matched with the positioning groove 1121 on the peripheral wall 112 of the upper shell 11, so that the upper shell 11 and the lower shell 12 can be positioned with each other, so that the assembly accuracy of the upper shell 11 and the lower shell 12 can be improved, and the assembly efficiency can be improved. At the same time, the cooperation of the positioning flange 122 and the positioning groove 1121 can limit the position of the upper shell 11 and the lower shell 12, thereby preventing the upper shell 11 and the lower shell 12 from relative displacement.

[0045] In a specific embodiment of the present invention, Figures 1 to 8 As shown, the positioning flange 122 includes a first positioning flange 1221 extending along the length direction of the lower shell 12 and a second positioning flange 1222 extending along the width direction of the lower shell 12, and the positioning groove 1121 includes a first positioning groove 11211 cooperating with the first positioning flange 1221 and a second positioning groove 11212 cooperating with the second positioning flange 1222.

[0046] For example Figure 1, Figure 2 , Figure 3 and Figure 5 As shown, both sides of the lower shell 12 in the width direction are provided with first positioning flanges 1221, both ends of the lower shell 12 in the length direction are provided with second positioning flanges 1222, both sides of the upper shell 11 in the width direction are provided with first positioning grooves 11211, and both sides of the upper shell 11 in the length direction are provided with second positioning grooves 11212; when the lower shell 12 is matched with the upper shell 11, the two first fixed flanges on the lower shell 12 are respectively matched with the two first positioning grooves 11211 on the corresponding upper shell 11, and the two second fixed flanges on the lower shell 12 are respectively matched with the corresponding The two second positioning grooves 11212 on the corresponding upper shell 11 cooperate with each other, so that the first positioning flange 1221 cooperates with the first positioning groove 11211 to limit the lower shell 12 and the upper shell 11 in the length direction, and the second positioning flange 1222 cooperates with the second positioning groove 11212 to limit the lower shell 12 and the upper shell 11 in the width direction, thereby effectively preventing relative displacement between the lower shell 12 and the upper shell 11, and releasing stress to avoid deformation of the BMS shell under greater stress, thereby ensuring the overall structural stability of the BMS shell.

[0047] In some embodiments, for example Figure 3 As shown, an opening groove 5 is provided at the second positioning flange 1222 , and the opening groove 5 can reduce the influence of vibration on the BMS housing and play a role in protecting the BMS housing.

[0048] In one embodiment of the present invention, Figures 1 to 8 As shown, there are four step rivets 3, which are respectively located at the four corners of the upper shell 11. In this way, the four step rivets 3 position the four corners of PCBA2, which can not only improve the positioning accuracy of the step rivets 3, but also make the force on PCBA2 more balanced and less prone to shaking after the overall assembly of the BMS shell is completed.

[0049] Furthermore, after assembly, the installation points of the BMS shell are all located at the four corners. When the BMS shell is impacted, the impact force can be effectively dispersed to the surroundings, thereby reducing the impact on the BMS shell and protecting the safety of the BMS shell.

[0050] In one embodiment of the utility model, the upper shell 11 and the lower shell 12 are both stamped from metal materials. The upper shell 11 and the lower shell 12 made of metal materials have good electromagnetic shielding performance and good anti-interference ability, which can effectively prevent electromagnetic interference from affecting PCBA2. At the same time, the upper shell 11 and the lower shell 12 made of metal materials have high structural strength, are not easy to be damaged, and can effectively protect the PCBA2 inside; the upper shell 11 and the lower shell 12 made by stamping technology have higher dimensional accuracy and the surface of the shell is smoother.

[0051] In addition, the upper shell 11 and the lower shell 12 made of metal material have good heat dissipation performance, which can effectively reduce the heat accumulation in the hollow cavity, thereby ensuring the stable operation of the BMS.

[0052] In a specific embodiment of the present invention, Figures 1 to 8 As shown, the lower housing 12 has a heat dissipation boss 123 protruding toward the PCBA2, the heat dissipation boss 123 extends along the length direction of the lower housing 12, and the table of the heat dissipation boss 123 contacts the surface of the PCBA2. In this embodiment, the table of the heat dissipation boss 123 contacts the PCBA2 to accelerate the heat transfer between the two, so that the heat on the PCBA2 can be quickly transferred to the external environment through the heat dissipation boss 123, thereby preventing the PCBA2 from thermal runaway during operation, and ensuring the stability of the BMS during operation.

[0053] In some embodiments, a thermal conductive paste, thermal grease, etc. can be provided between the surface of the heat dissipation boss 123 and the PCBA 2 , so that the heat dissipation of the PCBA 2 can be further enhanced.

[0054] In some embodiments, for example Figure 3 As shown, four mounting holes 6 are provided at the four corners of the lower shell 12 so that the BMS shell can be fixed on the battery pack through the mounting holes 6, wherein the spacing between the mounting holes 6 or the size of the mounting holes 6 can be adjusted according to actual conditions.

[0055] Other structures and operations of the BMS housing and PCBA fixing structure 100 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A BMS housing and PCBA fixing structure, characterized in that: include: A BMS housing, the BMS housing comprising an upper housing and a lower housing, wherein the upper housing and the lower housing are connected to form a hollow cavity; PCBA, the PCBA is accommodated in the hollow cavity, and the PCBA is provided with a through hole; A stepped rivet, the stepped rivet being passed through at least a portion of the through hole, and the stepped rivet being provided with a first positioning portion for positioning the PCBA; A bolt is passed through the lower housing, the PCBA, the step rivet and the upper housing in sequence to fix the upper housing and the lower housing together.

2. The BMS housing and PCBA fixing structure according to claim 1 is characterized in that: The stepped rivet includes a first section and a second section connected in the axial direction, the first section is located at one end of the second section facing the upper shell, the diameter of the first section is greater than the diameter of the second section, the first positioning portion is a stepped surface constructed between the first section and the second section, the second section is penetrated through the through hole, and the PCBA overlaps the stepped surface.

3. The BMS housing and PCBA fixing structure according to claim 1, characterized in that: A second positioning portion is formed on one side of the lower housing facing the PCBA, the first positioning portion is positioned at one side of the PCBA, and the second positioning portion is positioned at the other side of the PCBA.

4. The BMS housing and PCBA fixing structure according to claim 3 is characterized in that: The second positioning portion is a boss protruding toward the PCBA, and the boss abuts against the chip on the PCBA.

5. The BMS housing and PCBA fixing structure according to claim 4 is characterized in that: The boss is formed by stamping the lower shell.

6. The BMS housing and PCBA fixing structure according to claim 1, characterized in that: The upper shell comprises a bottom wall and a peripheral wall connected to the outer periphery of the bottom wall, wherein the bottom wall and the peripheral wall form the hollow cavity having an opening; the lower shell is used to cover the opening of the hollow cavity; Wherein, the peripheral wall is provided with a positioning groove, and the lower shell has a positioning flange folded toward the peripheral wall and adapted to the positioning groove.

7. The BMS housing and PCBA fixing structure according to claim 6, characterized in that: The positioning flange includes a first positioning flange extending along the length direction of the lower shell and a second positioning flange extending along the width direction of the lower shell, and the positioning groove includes a first positioning groove cooperating with the first positioning flange and a second positioning groove cooperating with the second positioning flange.

8. The BMS housing and PCBA fixing structure according to claim 1, characterized in that: The number of the step rivets is four, and the four step rivets are respectively located at four corners of the upper shell.

9. The BMS housing and PCBA fixing structure according to claim 1, characterized in that: The upper shell and the lower shell are both formed by stamping metal materials.

10. The BMS housing and PCBA fixing structure according to claim 9, characterized in that: The lower housing has a heat dissipation boss protruding toward the PCBA, the heat dissipation boss extends along the length direction of the lower housing, and a surface of the heat dissipation boss contacts a surface of the PCBA.

Images