Battery management device

Abstract

The utility model provides a battery management device comprising a circuit board assembly comprising a circuit board; the circuit board assembly is arranged in the shell; the at least two positioning assemblies are located in the shell, each positioning assembly comprises a base body connected with the shell, the end, away from the shell, of the base body is connected with a positioning column and a supporting part, and the supporting part is located on at least one side of the positioning column in the radial direction of the positioning column; a protruding positioning protrusion is formed on the circumferential side wall of the positioning column. When the circuit board assembly is connected in the shell, the positioning columns are connected to the circuit board in a penetrating mode, the positioning protrusions deform under the extrusion effect of the circuit board so as to position the circuit board assembly, and the supporting parts abut against the circuit board. According to the battery management device provided by the invention, the part, far away from the positioning column, of the positioning bulge can generate local deformation under the extrusion action of the circuit board, so that the circuit board is ensured not to move in the shell under the positioning action of the positioning assembly, and the dimensional tolerance of the shell and the circuit board in the positioning direction can also be tolerant.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery management device. Background Technology

[0002] A battery management system (BMS) includes a housing and a printed circuit board assembly (PCBA) mounted within the housing. In related technologies, the PCBA includes a circuit board and connectors (or terminals) connected to the circuit board, with the connectors extending out of the housing via openings. To meet the protection rating requirements of the battery management system (e.g., IP4X), after the PCBA is assembled with the housing, the gap between the connectors and the housing openings must be less than a predetermined size (e.g., less than 1 mm for IP40).

[0003] However, due to limitations in the molding processes of the housing and the circuit board, it is difficult to achieve high positioning accuracy between the housing and the circuit board. Consequently, the gap between the connector and the housing opening is also difficult to meet the process requirements, which will have an adverse impact on the yield of the battery management device. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery management device to at least partially solve the problem of low positioning accuracy between the circuit board and the housing.

[0005] To achieve the above objectives, this application provides a battery management device, comprising: a circuit board assembly including a circuit board; a housing, wherein the circuit board assembly is disposed inside the housing; at least two positioning components located within the housing, each positioning component including a base connected to the housing, wherein a positioning post and a support portion are connected to the end of the base away from the housing, the support portion being located on at least one side of the positioning post along the radial direction of the positioning post; a protruding positioning protrusion is formed on the circumferential sidewall of the positioning post; when the circuit board assembly is connected to the housing, the positioning post is connected through the circuit board, and the positioning protrusion deforms under the compression of the circuit board to position the circuit board assembly, and the support portion abuts against the circuit board.

[0006] Optionally, the circumferential dimension of the positioning protrusion along the positioning post is defined as the width of the positioning protrusion; along the radial direction of the positioning post, the width of the positioning protrusion gradually decreases in the direction away from the positioning post.

[0007] Optionally, the positioning protrusion has two sidewalls arranged opposite each other along the width direction, with an included angle of 60° between the two sidewalls.

[0008] Optionally, along the radial direction of the positioning post, the end of the positioning protrusion away from the positioning post is provided with a rounded corner.

[0009] Optionally, the protrusion height of the positioning protrusion is 0.3 mm to 1 mm along the radial direction of the positioning post.

[0010] Optionally, the interference between the positioning protrusion and the circuit board along the radial direction of the positioning post is X, and X is proportional to the dimension of the housing perpendicular to its thickness.

[0011] Optional, X≥0.04mm.

[0012] Optionally, the positioning protrusion extends axially along the positioning post, and the positioning protrusion includes a mating portion located on the side of the support portion away from the base, the mating portion having an extension length of 2mm to 3mm.

[0013] Optionally, the positioning protrusion extends along the axial direction of the positioning post to the base.

[0014] Optionally, the circuit board is provided with circular positioning through holes and oblong positioning through holes spaced apart along its length, the minor axis of the oblong positioning through holes being perpendicular to the length direction of the circuit board; the positioning post includes a first positioning post penetrating the circular positioning through hole and a second positioning post penetrating the oblong positioning through hole; four positioning protrusions are evenly arranged around the first positioning post; the second positioning post is provided with two positioning protrusions distributed along the minor axis of the oblong positioning through hole; and / or, at least two support portions are provided along the edge of the end face of the substrate away from the housing, and the support portions are evenly distributed around the positioning posts.

[0015] As can be seen from the above, the battery management device provided in this application can roughly position the circuit board assembly by means of a positioning post penetrating the circuit board when the circuit board assembly is connected inside the housing. To compensate for the gap between the circuit board and the positioning post, a protruding positioning protrusion is provided on the circumferential sidewall of the positioning post. The protrusion height of the positioning protrusion can be slightly greater than the gap between the circuit board and the positioning post. When the positioning protrusion interferes with the circuit board, the portion of the positioning protrusion away from the positioning post can undergo local deformation under the squeezing action of the circuit board, ensuring the assemblability of the positioning assembly and the circuit board. Simultaneously, since the shape of the deformed positioning protrusion is formed based on the actual gap between the circuit board and the positioning post, it not only ensures that the circuit board will not move within the housing under the positioning action of the positioning assembly, but also accommodates dimensional tolerances between the housing and the circuit board in the positioning direction. This allows for relaxed dimensional requirements for the housing and the circuit board assembly, ensuring consistency in the gap between the connector and the housing opening, improving the yield rate of the battery management device, reducing material costs, and facilitating mass production.

[0016] Simultaneously, the substrate provides reliable support for the positioning posts and the support components, ensuring that the positioning posts remain in place during assembly with the circuit board and subsequent use, and maintaining a fixed position between the circuit board assembly and the housing. The support components provide reliable support force when in contact with the circuit board, ensuring reliable positioning of the circuit board along its thickness. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial schematic diagram of a battery management device according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the assembly of the connectors and housing of the circuit board assembly;

[0020] Figure 3 This is a cross-sectional schematic diagram of the battery management device according to an embodiment of this application;

[0021] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0022] Figure 5 for Figure 3 Enlarged schematic diagram of the second structure in section A;

[0023] Figure 6 This is a top view of the positioning post for the second type of structure;

[0024] Figure 7 for Figure 1 Enlarged schematic diagram of part B;

[0025] Figure 8 for Figure 1 An enlarged schematic diagram of section C;

[0026] Figure 9 A three-dimensional schematic diagram of a positioning assembly including the first positioning post;

[0027] Figure 10 This is a three-dimensional schematic diagram of a positioning assembly including a second positioning post.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Circuit board assembly; 110. Circuit board; 111. Circular positioning through hole; 112. Oblong positioning through hole; 113. Positioning hole; 120. Connector;

[0030] 200. Shell;

[0031] 300, Positioning component; 310, Base; 320, Positioning post; 320a, First positioning post; 320b, Second positioning post; 330, Support part; 340, Positioning protrusion; 341, Side wall; 342, Mating part. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0033] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0034] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] Figure 1 A partial schematic diagram of the battery management device is shown, such as... Figure 1 The battery management device includes a housing 200 and a circuit board assembly 100 disposed within the housing 200. Figure 2 An assembly diagram of the connector 120 of the circuit board assembly 100 and the housing 200 is shown, as follows. Figure 1 and Figure 2 The circuit board assembly 100 includes a circuit board 110 and a connector 120 electrically connected to the circuit board 110. If the positioning accuracy between the circuit board assembly 100 and the housing 200 is low, it is difficult to ensure that the actual size of the gaps a, b, and c between the connector 120 and the housing 200 meets the process requirements corresponding to the protection level.

[0038] Figure 3 A cross-sectional schematic diagram of the battery management device is shown, such as... Figure 3 To improve the positioning accuracy between the circuit board assembly 100 and the housing 200, at least two positioning components 300 can be provided inside the housing 200, and matching positioning holes 113 can be provided on the circuit board 110. Specifically, each positioning component 300 includes a base 310 connected to the housing 200, and a positioning post 320 and a support portion 330 are connected to the end of the base 310 away from the housing 200. The support portion 330 is located on at least one side of the positioning post 320 along the radial direction of the positioning post 320.

[0039] Figure 4 Showing Figure 3 An enlarged diagram of part A, as shown below. Figure 4 During the assembly of the circuit board assembly 100 and the housing 200, the positioning pin 320 passes through the positioning hole 113 to position the circuit board 110 perpendicular to the thickness direction (the thickness direction of the circuit board 110 is the...). Figure 3 and Figure 4Positioning in the Z direction (of the image).

[0040] However, the applicant discovered that when the dimensions (length or width) of the housing 200 are large, due to size and structure reasons, the injection-molded housing 200 will shrink unevenly after demolding, resulting in significant deformation. This causes positional tolerances in the positioning pins 320, which are integrally molded with the housing 200. Simultaneously, due to the inherent tolerance requirements of the circuit board 110 manufacturing process, the dimensions and positions of the positioning holes 113 also have certain tolerances. To ensure that the housing 200 and the circuit board 110 can be assembled within these tolerances, a certain design clearance is required between the positioning holes 113 and the positioning pins 320 to ensure their insertion fit.

[0041] However, the actual gap between the positioning post 320 and the positioning hole 113 is difficult to control precisely within the tolerance range. If the actual gap is too large, the circuit board 110, although inserted into the positioning post 320, can still move within a certain range, resulting in the circuit board assembly 100 not being uniquely positioned within the housing 200, making it difficult to ensure that the gap between the connector 120 and the housing 200 meets the process requirements. If the actual gap is too small, there is a risk that the circuit board 110 and the housing 200 cannot be assembled. In this case, forcibly pressing the circuit board 110 into the positioning post 320 may cause the positioning post 320 to break.

[0042] To solve the above problems, Figure 5 Showing Figure 3 An enlarged schematic diagram of the second structure in part A, as shown below. Figure 5 In some embodiments, the circumferential sidewall of the positioning post 320 is formed with a protruding positioning protrusion 340; when the circuit board assembly 100 is connected to the housing 200, the positioning post 320 is connected through the circuit board 110, and the positioning protrusion 340 is deformed under the squeezing action of the circuit board 110 to position the circuit board assembly 100, and the support portion 330 abuts against the circuit board 110.

[0043] For example, the base 310 and the shell 200 are integrally formed and connected, and the positioning post 320 and the support part 330 are respectively inserted, snapped, glued, welded or integrally formed and connected to the base 310.

[0044] For example, the positioning component 300 may be positioned near the edge of the housing 200.

[0045] For example, the base 310 can be a frustum structure, the positioning post 320 can be set at the center of the top plane of the frustum, and the support part 330 is also set on the top plane of the frustum.

[0046] For example, housing 200 may include an upper housing and a lower housing disposed opposite each other along the thickness direction of circuit board 110, the upper housing and the lower housing being fitted together to form an internal cavity for receiving circuit board assembly 100. The base 310 of positioning assembly 300 is connected to the upper housing or the lower housing.

[0047] When designing the positioning assembly 300, the gap between the positioning post 320 and the positioning hole 113 on the circuit board 110 can be designed to be relatively large to ensure that the positioning post 320 can be smoothly inserted into the positioning hole 113 of the circuit board 110. As the circuit board 110 moves along the positioning post 320 towards the base 310, it will abut against and press against the protruding positioning protrusion 340 on the positioning post 320. Under the pressure of the circuit board 110, at least some of the positioning protrusions 340 on each positioning post 320 will undergo local crushing deformation towards the positioning post 320. This avoids damage to the positioning post 320 while allowing the undeformed positioning protrusions 340 to position the circuit board 110 perpendicular to the thickness direction.

[0048] Once the circuit board 110 comes into contact with the support 330, the circuit board 110 can achieve complete positioning with the housing 200.

[0049] It should be noted that when there are multiple positioning protrusions 340 around the circumference of the positioning post 320, due to the positional tolerance between the positioning post 320 and the positioning hole 113 on the circuit board 110, some positions around the circumference of the positioning post 320 are closer to the hole wall of the positioning hole 113. Therefore, the positioning protrusion 340 located at this position will be deformed by the pressure of the circuit board 110. On the other hand, other positions around the circumference of the positioning post 320 are farther from the hole wall of the positioning hole 113. The positioning protrusion 340 located at this position may be deformed by the pressure of the circuit board 110, or it may not be deformed.

[0050] The battery management device provided in this application embodiment allows for approximate positioning of the circuit board assembly 100 when it is connected within the housing 200 via a positioning post 320 penetrating the circuit board 110. To compensate for the gap between the circuit board 110 and the positioning post 320, a protruding positioning protrusion 340 is provided on the circumferential sidewall of the positioning post 320. The protrusion height of the positioning protrusion 340 can be slightly greater than the gap between the circuit board 110 and the positioning post 320. When the positioning protrusion 340 interferes with the circuit board 110, the portion of the positioning protrusion 340 away from the positioning post 320 can undergo local deformation under the pressure of the circuit board 110, thereby ensuring the assemblability of the positioning assembly 300 and the circuit board 110. Meanwhile, since the shape of the deformed positioning protrusion 340 is formed based on the actual gap between the circuit board 110 and the positioning post 320, it can not only ensure that the circuit board 110 will not move inside the housing 200 under the positioning action of the positioning component 300, but also tolerate the dimensional tolerance of the housing 200 and the circuit board 110 in the positioning direction. This can relax the dimensional requirements of the housing 200 and the circuit board assembly 100, ensuring the consistency of the gap between the connector 120 and the opening of the housing 200, improving the yield of the battery management device, and also helping to reduce material costs, which is beneficial for mass production.

[0051] Meanwhile, the base 310 provides reliable support for the positioning post 320 and the support portion 330, ensuring that the positioning post 320 is fixed in position during assembly with the circuit board 110 and subsequent use, and ensuring that the position between the circuit board assembly 100 and the housing 200 remains fixed. The support portion 330 provides reliable support force when it abuts against the circuit board 110, thereby achieving reliable positioning of the circuit board 110 along its thickness direction.

[0052] Figure 6 A top view of the positioning post 320 of the second structure is shown, as follows. Figure 6 In some embodiments, the circumferential dimension of the positioning protrusion 340 along the positioning post 320 is defined as the width W of the positioning protrusion 340; the radial dimension along the positioning post 320 (e.g., Figure 6 In the X direction, the width of the positioning protrusion 340 gradually decreases in the direction away from the positioning post 320.

[0053] For example, the width of the positioning protrusion 340 can vary continuously or in stages. When the width of the positioning protrusion 340 varies continuously, its sidewall 341, which is provided along the width direction, has a smooth surface; when the width of the positioning protrusion 340 varies in stages, the sidewall 341 has a stepped surface.

[0054] For example, the width of the positioning protrusion 340 is along the axial direction of the positioning post 320 (e.g. Figure 5 The Z-direction is uniformly set.

[0055] When the circuit board assembly 100 mates with the positioning assembly 300, the circuit board 110 is highly likely to compress the portion of the positioning protrusion 340 radially away from the positioning post 320 (hereinafter referred to as the outer end of the positioning protrusion 340), and this portion needs to deform to allow the circuit board 110 to complete the assembly with the positioning assembly 300. Designing the outer end of the positioning protrusion 340 to be narrower makes it easier for the outer end to deform under pressure, thereby reducing the assembly difficulty between the circuit board assembly 100 and the positioning assembly 300. Simultaneously, it avoids damage to the circuit board 110 due to excessive reaction force, and also prevents damage to the positioning post 320 due to the transmission of the compressive force.

[0056] The inner end of the positioning protrusion 340 (i.e., the portion of the positioning protrusion 340 radially close to the positioning post 320) is designed to be wider. On the one hand, this ensures the reliability of the connection between the positioning protrusion 340 and the positioning post 320, preventing the circuit board assembly 100 from failing to position due to separation of the positioning protrusion 340 and the positioning post 320. On the other hand, since the inner end of the positioning protrusion 340 is unlikely to deform, but rather needs to provide support force perpendicular to its thickness direction for the circuit board 110, the wider inner end of the positioning protrusion 340 can ensure stable support for the circuit board 110, ensuring high positioning accuracy between the circuit board assembly 100 and the housing 200.

[0057] like Figure 6 In some embodiments, the positioning protrusion 340 has two sidewalls 341 disposed opposite each other in the width direction, and the included angle d between the two sidewalls 341 is 60°.

[0058] If the included angle d is too small, the inner width of the positioning protrusion 340 will be small, and the part of the positioning protrusion 340 near the positioning post 320 will hardly provide reliable support for the circuit board 110 even if it is not deformed by pressure. If the included angle d is too large, the outer end of the positioning protrusion 340 will not be easy to deform, which may hinder the cooperation between the circuit board assembly 100 and the positioning assembly 300.

[0059] Therefore, in this embodiment, the included angle d is limited to 60°, which can ensure that the outer end of the positioning protrusion 340 is easily deformed by pressure, while ensuring that the inner end can provide stable support for the circuit board 110, and ensuring that the circuit board assembly 100 and the housing 200 have high positioning accuracy.

[0060] like Figure 6 In some embodiments, the end of the positioning protrusion 340 away from the positioning post 320 is provided with a rounded corner along the radial direction of the positioning post 320.

[0061] A rounded corner is provided at the far end of the positioning protrusion 340 to prevent the sharp edges and corners of the positioning protrusion 340 from scratching the circuit board 110 when it comes into contact with it, and to protect the traces or components on the circuit board 110.

[0062] like Figure 6 In some embodiments, the protrusion height H of the positioning protrusion 340 is 0.3 mm to 1 mm along the radial direction of the positioning post 320.

[0063] For example, H can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.

[0064] If H is too small, the positioning protrusion 340 may not be able to contact the circuit board 110 when it passes through the positioning post 320. This would result in the circuit board assembly 100 and the positioning component 300 still being able to move relative to the housing 200 after assembly, and the positioning accuracy between the circuit board assembly 100 and the housing 200 could not be guaranteed. If H is too large, the positioning protrusion 340 may not easily deform enough to allow the circuit board 110 to pass through when the circuit board 110 passes through the positioning post 320 due to the large amount of interference between the positioning protrusion 340 and the circuit board 110. This would result in the assembly between the circuit board assembly 100 and the positioning component 300 being more difficult.

[0065] Therefore, in this embodiment, H is limited to 0.3mm to 1mm. This ensures that the circuit board assembly 100 can be smoothly assembled with the positioning assembly 300, while also allowing the positioning protrusion 340 to provide stable support for the circuit board 110, thus ensuring high positioning accuracy between the circuit board assembly 100 and the housing 200.

[0066] In some embodiments, the amount of interference between the positioning protrusion 340 and the circuit board 110 along the radial direction of the positioning post 320 is X (hereinafter referred to as interference X), which is proportional to the dimension of the housing 200 perpendicular to its thickness (when the outer diameter of the housing 200 is approximately cuboid, this dimension is the length or width of the housing 200).

[0067] As the size of the housing 200 increases, the size of the circuit board 110 will also increase accordingly. This will lead to a corresponding increase in the tolerance ranges of the housing 200, the positioning component 300, the circuit board 110, and the positioning hole 113. This could result in a larger actual gap between the positioning post 320 and the positioning hole 113. Therefore, to ensure that the positioning protrusion 340 can reliably compensate for the aforementioned actual gap, the interference amount X needs to be increased accordingly when designing the positioning protrusion 340. This ensures that during the actual assembly of the circuit board assembly 100 and the positioning component 300, the outer end of the positioning protrusion 340 can be deformed by the circuit board 110, thereby providing stable support for the circuit board 110 and ensuring high positioning accuracy between the circuit board assembly 100 and the housing 200.

[0068] In some embodiments, X ≥ 0.04 mm.

[0069] For example, X can be 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm or 0.16mm.

[0070] Table 1. Relationship between interference quantity X and shell length and width

[0071]

[0072]

[0073] The applicant designed the positioning protrusion 340 according to the data in Table 1. For example, the length of the housing 200 is 260mm, the width is 95mm, and the thickness is 23mm. The material of the housing 200 is PBT-GF25. The protrusion height H of the positioning protrusion 340 is 0.5mm, and the interference amount X is 0.1mm. After the positioning component 300 and the circuit board component 100 are assembled, the gap between the connector 120 and the housing opening is measured. This gap meets the process requirements corresponding to the protection level of the battery management device.

[0074] like Figure 5 In some embodiments, the positioning protrusion 340 extends axially along the positioning post 320, and the positioning protrusion 340 includes a mating portion 342 located on the side of the support portion 330 away from the base 310, the extension length L of the mating portion 342 being 2 mm to 3 mm.

[0075] For example, L can be 2mm, 2.5mm or 3mm.

[0076] For example, L can be greater than the thickness of the circuit board 110.

[0077] If L is too small, the contact area between the positioning protrusion 340 and the circuit board 110 along the extension direction of the positioning protrusion 340 will be small when the circuit board assembly 100 is assembled with the positioning assembly 300, making it difficult for the positioning protrusion 340 to provide stable support for the circuit board 110. If L is too large, the axial dimension of the positioning post 320 will be too large, which may cause the positioning assembly 300 to interfere with other structures in the housing 200.

[0078] Therefore, in this embodiment, L is limited to 2mm to 3mm, which can ensure that the positioning protrusion 340 provides stable support for the circuit board 110, so as to ensure high positioning accuracy between the circuit board assembly 100 and the housing 200; it can also shorten the axial length of the positioning post 320 to avoid interference between the positioning assembly 300 and other structures of the housing 200, and help to make the structure of the battery management device more compact.

[0079] like Figure 5 In some embodiments, the positioning protrusion 340 extends axially along the positioning post 320 to the base 310.

[0080] For example, the end of the positioning protrusion 340 away from the base 310 has a surface inclined toward the base 310.

[0081] The positioning protrusion 340 extends to the base 310, which helps to further improve the connection reliability between the positioning protrusion 340 and the positioning post 320, and prevents the positioning protrusion 340 from separating from the positioning post 320 when the circuit board 110 squeezes the positioning protrusion 340, thereby causing the positioning of the circuit board assembly 100 to fail.

[0082] like Figure 1 In some embodiments, the circuit board 110 is provided with a length direction (e.g., Figure 1 Circular positioning through holes 111 and oblong positioning through holes 112 are spaced apart in the X direction. The minor axis direction of the oblong positioning through holes 112 is as follows: Figure 1 The Y direction in the circuit board 110 is perpendicular to the length direction of the circuit board 110.

[0083] The circular positioning through hole 111 is the main positioning hole 113 of the circuit board 110, and the oblong positioning through hole 112 is the auxiliary positioning hole 113 of the circuit board 110. After the circuit board 110 is positioned only by the circular positioning through hole 111, it can rotate around the circular positioning through hole 111; when the circuit board 110 is positioned along its minor axis by the oblong positioning through hole 112, the circuit board 110 can be completely positioned and no longer move.

[0084] In summary, in order to position the circuit board 110, the circular positioning through hole 111 needs to be positioned radially, and the oblong positioning through hole 112 needs to be positioned along its short axis.

[0085] Figure 7 Showing Figure 1 An enlarged diagram of part B in the middle. Figure 8 Showing Figure 1 An enlarged diagram of part C, as shown below. Figure 7 The positioning post 320 includes a first positioning post 320a that penetrates the circular positioning through hole 111, and four positioning protrusions 340 are evenly arranged around the circumference of the first positioning post 320a. Figure 8 The positioning post 320 also includes a second positioning post 320b that penetrates the elongated positioning through hole 112. The second positioning post 320b is provided with two positioning protrusions 340 distributed along the short axis of the elongated positioning through hole 112.

[0086] In conjunction with the foregoing, the four evenly distributed positioning protrusions 340 on the first positioning post 320a can provide radial positioning for the circular positioning through-hole 111, ensuring the positioning accuracy between the circular positioning through-hole 111 and the first positioning post 320a. Similarly, the two positioning protrusions 340 on the second positioning post 320b, distributed along the minor axis of the elongated oval positioning through-hole 112, can provide minor axis positioning for the elongated oval positioning through-hole 112, ensuring the positioning accuracy between the elongated oval positioning through-hole 112 and the second positioning post 320b. When both the circuit board 110 and the first and second positioning posts 320a have high positioning accuracy, a high positioning accuracy between the circuit board assembly 100 and the housing 200 can be guaranteed.

[0087] Figure 9 A three-dimensional schematic diagram of the positioning assembly 300, including the first positioning post 320a, is shown. Figure 10 A three-dimensional schematic diagram of the positioning assembly 300, including the second positioning post 320b, is shown.

[0088] like Figure 9 and Figure 10 In some embodiments, at least two support portions 330 are provided along the edge of the end face of the base 310 away from the housing 200, and the support portions 330 are evenly distributed around the positioning post 320.

[0089] For example, when the base 310 corresponds to the circular positioning through hole 111, the end face of the base 310 away from the housing 200 is circular; when the base 310 corresponds to the oblong positioning through hole 112, the end face of the base 310 away from the housing 200 is oblong.

[0090] For example, three or more support portions 330 may be provided around the first positioning post 320a; and two support portions 330 may be provided around the second positioning post 320b.

[0091] At least two support portions 330 evenly arranged around the positioning post 320 can provide a stable support force to the circuit board 110, ensuring that the circuit board assembly 100 remains stable within the housing 200. Simultaneously, the support portions 330 are arranged along the edge of the end face of the base 310 away from the housing 200, which maximizes the spacing between the support portions 330 and the positioning post 320, further contributing to providing a stable support force to the circuit board 110.

[0092] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0093] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0094] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0095] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0096] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0097] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery management device, characterized in that, include: Circuit board assembly, including circuit boards; The housing, wherein the circuit board assembly is disposed inside the housing; At least two positioning components are located within the housing. Each positioning component includes a base connected to the housing. The end of the base away from the housing is connected to a positioning post and a support portion. The support portion is located on at least one side of the positioning post along the radial direction of the positioning post. A protruding positioning protrusion is formed on the circumferential sidewall of the positioning post. When the circuit board assembly is connected to the housing, the positioning post is connected through the circuit board, and the positioning protrusion deforms under the squeezing action of the circuit board to position the circuit board assembly, and the support part abuts against the circuit board.

2. The battery management device according to claim 1, characterized in that, The circumferential dimension of the positioning protrusion along the positioning post is defined as the width of the positioning protrusion; along the radial direction of the positioning post, the width of the positioning protrusion gradually decreases in the direction away from the positioning post.

3. The battery management device according to claim 2, characterized in that, The positioning protrusion has two sidewalls that are arranged opposite each other along the width direction, and the included angle between the two sidewalls is 60°.

4. The battery management device according to claim 2, characterized in that, Along the radial direction of the positioning post, the end of the positioning protrusion away from the positioning post is provided with a rounded corner.

5. The battery management device according to claim 1, characterized in that, Along the radial direction of the positioning post, the protrusion height of the positioning protrusion is 0.3 mm to 1 mm.

6. The battery management device according to claim 1, characterized in that, The interference between the positioning protrusion and the circuit board along the radial direction of the positioning post is X, and X is proportional to the dimension of the housing perpendicular to its thickness.

7. The battery management device according to claim 6, characterized in that, X≥0.04mm.

8. The battery management device according to claim 1, characterized in that, The positioning protrusion extends along the axial direction of the positioning post, and the positioning protrusion includes a mating part located on the side of the support portion away from the base, the extension length of the mating part being 2mm to 3mm.

9. The battery management device according to claim 1, characterized in that, The positioning protrusion extends along the axial direction of the positioning post to the base.

10. The battery management device according to claim 1, characterized in that, The circuit board is provided with circular positioning through holes and oblong positioning through holes spaced apart along the length direction, and the minor axis of the oblong positioning through holes is perpendicular to the length direction of the circuit board. The positioning post includes a first positioning post penetrating the circular positioning through-hole and a second positioning post penetrating the oblong positioning through-hole; the first positioning post has four positioning protrusions evenly distributed around its circumference; the second positioning post has two positioning protrusions distributed along the minor axis of the oblong positioning through-hole; and / or, At least two support portions are provided along the edge of the end face of the base away from the shell, and the support portions are evenly distributed around the positioning post.

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