Battery management system, battery pack

Abstract

The utility model provides a kind of battery management system, battery pack, battery management system includes circuit board and fin, nut is fixed on circuit board, and the through-hole corresponding with nut is equipped on fin;Before installing fin, nut is formed fixed connection relationship with circuit board, when installing fin, fin can be positioned and installed quickly and accurately, to avoid deviation or misplacement, worker does not need to repeatedly adjust nut position, improves reliability and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to a battery management system and a battery pack. Background Technology

[0002] In related technologies, existing battery management systems require the use of hexagonal studs for isolation and screws at both ends for fixing the heat sink to the circuit board; this method has drawbacks such as complex assembly process, inconvenient installation, difficult positioning, and susceptibility to errors.

[0003] Therefore, battery management systems in related technologies suffer from technical problems such as low reliability and low production efficiency. Utility Model Content

[0004] The embodiments of this utility model provide a battery management system and a battery pack, which can improve the technical problems of low reliability and low production efficiency in existing battery management systems.

[0005] In a first aspect, embodiments of the present invention provide a battery management system, comprising:

[0006] Circuit board;

[0007] The heat sink is thermally connected to the circuit board.

[0008] The circuit board has at least one nut pre-installed on it, and the heat sink has a through hole corresponding to the nut. The heat sink is fixed to the nut through the through hole.

[0009] In one embodiment, the circuit board is provided with at least three nuts, which are arranged asymmetrically.

[0010] In one embodiment, the circuit board is provided with three nuts, which are respectively located at one end and the other end of the circuit board along its length, and the number of nuts at one end is greater than the number of nuts at the other end.

[0011] In one embodiment, the nut includes a base and a guide ring distributed axially, the guide ring being located on the side of the base facing the heat sink, wherein the outer diameter of the base is larger than the inner diameter of the through hole, and the outer diameter of the guide ring is smaller than the inner diameter of the through hole.

[0012] In one embodiment, the heat sink includes a base plate and a plurality of spaced-apart blades. The heat sink also includes a clearance structure, which is offset from the blades in the thickness direction of the base plate.

[0013] In one embodiment, along the length direction of the blade, the ratio of the length of the clearance structure to the length of the corresponding blade is less than or equal to 1:9.

[0014] In one embodiment, the device further includes a thermally conductive adhesive, which is connected between the heat sink and the circuit board. The circuit board has multiple heat-generating components, and the thermally conductive adhesive covers at least the heat-generating components.

[0015] In one embodiment, the nut has a tapered guide opening facing the top of the heat sink, and the inner diameter of the tapered guide opening at the entrance on the side away from the circuit board is larger than the inner diameter of the tapered guide opening at the exit on the side facing the circuit board.

[0016] In one embodiment, the nut has a positioning post on the side facing the circuit board, and the circuit board has a positioning hole corresponding to the positioning post. The positioning post is embedded in the positioning hole for fixation.

[0017] Secondly, embodiments of the present invention provide a battery pack including a battery management system as described in any of the above embodiments.

[0018] The beneficial effects of the embodiments of this utility model are as follows:

[0019] In an embodiment of this utility model, at least one nut is pre-set on the circuit board, and a through hole corresponding to the nut is provided on the heat sink. The heat sink is fixed to the nut through the through hole. By forming a fixed connection between the nut and the circuit board before installing the heat sink, the subsequent installation process is simplified. The heat sink can be quickly and accurately positioned and installed to avoid offset or misalignment. Workers do not need to repeatedly adjust the position of the nut, which improves reliability and production efficiency. This improves the technical problems of low reliability and low production efficiency in the existing battery management system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the battery management system provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the heat sink in the battery management system provided in an embodiment of this utility model.

[0023] 1. Circuit board; 2. Heat sink; 21. Base plate; 22. Blade; 23. Clearance structure; 3. Nut; 31. Base; 32. Guide ring; 4. Through hole; 5. Thermal adhesive; 6. Screw; 7. Heating element. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0025] Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words indicate two or more unless otherwise expressly specified.

[0026] Please see Figure 1 The battery management system provided in the embodiment of this utility model includes a circuit board 1 and a heat sink 2. The heat sink 2 is fixedly connected to the circuit board 1. At least one nut 3 is preset on the circuit board 1. The heat sink 2 is provided with a through hole 4 corresponding to the nut 3. The heat sink 2 is fixed to the nut 3 through the through hole 4.

[0027] The fixed connection can be any one of welding, crimping, riveting, threaded connection, snap-fit ​​and slot connection, magnetic adsorption, or conductive adhesive bonding.

[0028] Understandably, when the welding process is used to connect the nut 3 and the circuit board 1, the welded nut 3 is more secure than the traditional stud, which can reduce the risk of loosening. At the same time, since the welding step is included in the manufacturing process of the circuit board 1, the nut 3 can be welded to the circuit board 1 without the need for additional welding processes.

[0029] It should be noted that before installing the heat sink 2, there is already a certain mechanical or physical fit between the nut 3 and the circuit board 1. Therefore, when installing the heat sink 2, the heat sink 2 can be quickly and accurately positioned and installed. The worker does not need to repeatedly adjust the position of the nut 3. The heat sink 2 is aligned as soon as it is placed, so as to avoid offset or misalignment.

[0030] In this embodiment, before the heat sink 2 is installed, the nut 3 is fixedly connected to the circuit board 1, which simplifies the subsequent installation process and improves reliability and production efficiency.

[0031] The technical solution of this application will now be described in conjunction with specific embodiments.

[0032] In one embodiment, the circuit board 1 is provided with at least three nuts 3, which are arranged asymmetrically.

[0033] Among them, the through hole 4 on the heat sink 2 must be perfectly matched with the three nuts 3 on the circuit board 1. If the orientation is wrong, the hole cannot be aligned and the screw 6 cannot be forcibly screwed in.

[0034] It is understandable that the number of nuts 3 can be, but is not limited to, five or seven, and the number of nuts 3 can also be an even number, as long as the number of nuts 3 at one end of the circuit board 1 is not equal or asymmetrical with the number of nuts 3 at the other end.

[0035] Understandably, in the traditional method of fixing the heat sink 2, only symmetrically distributed nuts 3 are usually used, which makes it easy to install in the wrong direction or misalign. In this embodiment, the asymmetrical arrangement of three nuts 3 is used so that the heat sink 2 can only be installed in one direction. Otherwise, the screw holes cannot be aligned, thereby reducing human error. When assembling the heat sink 2 and the circuit board 1, the workers do not need to rely on experience to judge the direction. They only need to align the through holes 4 of the heat sink 2 with the nuts 3 respectively, thereby avoiding the heat sink 2 being installed backward or offset.

[0036] In this embodiment, the circuit board 1 is provided with three nuts 3 arranged asymmetrically to prevent human assembly errors, ensure that the product can only be installed in the correct way, and further improve assembly efficiency and reliability.

[0037] In one embodiment, the circuit board 1 is provided with three nuts 3, which are respectively provided at one end and the other end along the length direction of the circuit board 1, and the number of nuts 3 at one end is greater than the number of nuts 3 at the other end.

[0038] It should be noted that the circuit board 1 has three nuts 3, which not only simplifies the assembly process and improves assembly efficiency and reliability, but also reduces costs and improves product consistency and yield compared to a solution with a complex guide structure.

[0039] In one embodiment, the nut 3 includes a base 31 and a guide ring 32 distributed along the axial direction. The guide ring 32 is located on the side of the base 31 facing the heat sink 2. The outer diameter of the base 31 is larger than the inner diameter of the through hole 4, and the outer diameter of the guide ring 32 is smaller than the inner diameter of the through hole 4.

[0040] The through hole 4 and the guide ring 32 are designed to complement each other, and the heat sink 2 can only be installed with the circuit board 1 if it is placed in the correct direction.

[0041] It is understandable that by making the outer diameter of the base 31 larger than the inner diameter of the through hole 4 and the outer diameter of the guide ring 32 smaller than the inner diameter of the through hole 4, the heat sink 2 will be located above the base 31, so that a certain gap can be reserved between the heat sink 2 and the circuit board 1 to prevent the heat-generating component 7 from being squeezed by the heat sink 2.

[0042] In one embodiment, the heat sink 2 includes a base plate 21 and a plurality of blades 22 spaced apart from each other. The heat sink 2 also includes a clearance structure 23, which is offset from the blades 22 in the thickness direction of the base plate 21.

[0043] Among them, the clearance structure 23 is a specially reserved space or optimized shape to avoid collisions or friction between components.

[0044] The battery management system also includes a top cover, which is located above the circuit board 1 to protect the circuit board 1 and electronic components.

[0045] The top cover may also be equipped with reinforcing ribs, and the clearance structure 23 can avoid the reinforcing ribs to prevent the reinforcing ribs from getting stuck with the heat sink 2, which would prevent the top cover from being unable to open or the circuit board 1 from being deformed by pressure.

[0046] The clearance structure 23 can be recessed or slotted.

[0047] Among them, the clearance structure 23 can also be designed as a slope or a stepped structure to avoid interference through the height difference.

[0048] It is understandable that the heat sink 2, heat-generating components 7, capacitors and other components in the battery management system are densely arranged. By setting the air-proof structure 23, the above components can be prevented from contacting the top cover or other parts.

[0049] It is understandable that the heat sink 2 may deform slightly after being heated due to thermal expansion. The heat sink 2 is provided with a clearance structure 23 to provide a certain buffer space for the deformation of the heat sink 2, so as to avoid the heat sink 2 being squeezed or collided with the top cover and other components when it is deformed by thermal expansion.

[0050] It is understandable that there are certain assembly tolerances during the assembly process of the battery management system, and there are also dimensional errors in production. By designing the clearance structure 23, certain deviations can be accommodated to ensure smooth assembly.

[0051] In this embodiment, the heat sink 2 is provided with a clearance structure 23, which not only protects the circuit board 1 and prevents the heat sink 2 from squeezing the circuit board 1, but also eliminates long-term stress damage caused by interference, thereby improving reliability.

[0052] In one embodiment, along the length direction of the blade 22, the ratio of the length of the clearance structure 23 to the length of the corresponding blade 22 is less than or equal to 1:9.

[0053] The ratio of the length of the clearance structure 23 to the length of the corresponding blade 22 can be 1:10 or 1:9.

[0054] Among them, blades 22 are provided at the position corresponding to the heating element 7.

[0055] It is understandable that the ratio of the length of the air-shielding structure 23 to the length of the corresponding blade 22 is less than or equal to 1:9, so as to protect the circuit board 1 and improve reliability while ensuring that the main body of the blade 22 still has sufficient heat dissipation area.

[0056] It should be noted that making the ratio of the length of the clearance structure 23 to the length of the corresponding blade 22 less than or equal to 1:9 can also prevent the blade 22 from deforming or breaking due to excessive cutting.

[0057] In one embodiment, please refer to Figure 2 It also includes thermally conductive adhesive 5, which is connected between the heat sink 2 and the circuit board 1. The circuit board 1 is provided with multiple heat-generating components 7, and the thermally conductive adhesive 5 covers at least the heat-generating components 7.

[0058] Among them, the heat sink 2 is a heat-conducting component, which is used to absorb and dissipate the heat of the heat-generating component 7.

[0059] Among them, the thermally conductive adhesive 5 can be thermally conductive silicone, which is filled in the gap between the heating element 7 and the heat sink 2 to ensure efficient heat transfer between the heating element 7 and the heat sink 2.

[0060] Understandably, the related technologies require separate application and curing of adhesive materials, which increases production time and cost. In this application, the thermally conductive adhesive 5 is pre-installed on the heat sink 2 before the heat sink 2 is installed, forming an integral part with the heat sink 2. There is no need to apply adhesive and cure it when installing the heat sink 2, which saves time and cost and improves production efficiency.

[0061] Understandably, in related technologies, thermally conductive adhesive 5 is usually applied manually to the heating element 7 or heat sink 2. The amount and uniformity of the adhesive are difficult to control. Too much adhesive will cause overflow and contaminate the circuit board 1, while too little adhesive will result in poor thermal conductivity between the heating element 7 and the heat sink 2. In this application, when thermally conductive adhesive 5 is pre-applied to the heat sink 2, the thickness and distribution of the thermally conductive adhesive 5 can be controlled by a machine to avoid errors caused by manual application.

[0062] It is understandable that the thermally conductive adhesive 5 can be fixed to the contact surface of the heat sink 2 by means of mold pressing or adhesive backing. The shape, thickness and area of ​​the thermally conductive adhesive 5 can be designed according to the size of the heat-generating component 7 to ensure that the thermally conductive adhesive 5 completely covers the heat-generating component 7.

[0063] It should be noted that when the heat sink 2 is fixed to the circuit board 1 by the screw 6, the pressure causes the thermally conductive adhesive 5 to fill the tiny gap between the heat-generating component 7 and the heat sink 2 evenly, expelling air and improving the thermal conductivity between the heat-generating component 7 and the heat sink 2.

[0064] It should be noted that the air-proof structure 23 of the heat sink 2 works in conjunction with the thermally conductive adhesive 5. When the thermally conductive adhesive 5 is squeezed and spread, the air-proof structure 23 can accommodate part of the thermally conductive adhesive 5 to prevent the thermally conductive adhesive 5 from squeezing onto the surrounding components, thereby preventing any impact on the stability and reliability of the battery management system.

[0065] In one embodiment, the nut 3 is provided with a tapered guide opening facing the top of the heat sink 2. The inner diameter of the tapered guide opening at the entrance on the side away from the circuit board 1 is larger than the inner diameter of the tapered guide opening at the exit on the side facing the circuit board 1.

[0066] The nut 3 can be made of brass or stainless steel, and the tapered guide opening is formed by turning or cold heading.

[0067] The tapered guide opening is coaxial with the nut 3.

[0068] Understandably, when screw 6 is installed, the tapered guide port automatically guides screw 6 to align with the exit, reducing manual fine-tuning. The tapered guide port also allows screw 6 to enter vertically, avoiding thread damage or stripping caused by oblique tightening.

[0069] Understandably, the tapered guide port further ensures that the three holes are aligned synchronously when the heat sink 2 is installed, thus improving the foolproof effect.

[0070] In this embodiment, the tapered guide port has a larger inlet, allowing the screw to slide in easily; the tapered guide port has a smaller outlet, which facilitates alignment with the nut 3, allowing the screw 6 to enter vertically and avoiding thread damage or stripping caused by oblique tightening.

[0071] In one embodiment, the nut 3 has a positioning post on the side facing the circuit board 1, and the circuit board 1 has a positioning hole corresponding to the positioning post. The positioning post is embedded in the positioning hole for fixation.

[0072] The positioning post is a cylindrical or conical protrusion.

[0073] The inner diameter of the positioning hole is larger than the outer diameter of the positioning post.

[0074] The positioning pin and nut 3 can be integrally formed.

[0075] It is understandable that the positioning post can be a non-circular positioning post, thereby preventing the nut 3 from rotating when tightening the screw 6, and avoiding damage to the solder joint between the nut 3 and the circuit board 1.

[0076] It should be noted that by providing a positioning post on the side of the nut 3 facing the circuit board 1, the positioning post and the positioning hole can make the nut 3 more accurately installed in the corresponding position of the circuit board 1. At the same time, during the welding process of the nut 3, the limiting effect of the positioning post and the positioning hole can ensure that the nut 3 will not shift relative to the circuit board 1.

[0077] Secondly, embodiments of the present invention provide a battery pack including a battery management system as described in any of the above embodiments.

[0078] This invention solves the problems of complexity and inefficiency of traditional processes by optimizing the fixing method of the heat sink 2. It has advantages such as low cost, easy installation and strong error prevention, and is suitable for heat dissipation structure design of battery management system.

[0079] The purpose of this invention is to simplify the installation process, reduce material usage, and improve the convenience and error-proof effect of installation and positioning.

[0080] The method for preparing the battery management system of this utility model is as follows, including:

[0081] S1: In the surface mount process of circuit board 1, nut 3 is directly soldered onto circuit board 1 to prepare circuit board 1 which is fixedly connected to nut 3.

[0082] S2: A through hole 4 corresponding to the nut 3 is formed on the heat sink 2. The heat sink 2 is installed on the circuit board 1 by using the guiding and positioning functions of the nut 3 and the through hole 4.

[0083] S3: Use screw 6 to directly fix heat sink 2 through through hole 4.

[0084] In step S2, thermally conductive silicone can be pre-applied to the heat sink 2 to avoid applying adhesive in subsequent installation steps, thus simplifying the installation process and improving production efficiency.

[0085] The technical advantages of this application are:

[0086] (1) The number of screws has been reduced by 6, making the materials more streamlined;

[0087] (2) Before installing the heat sink 2, the nut 3 is fixed on the circuit board 1 to compress the process and improve production efficiency.

[0088] (3) The heat sink 2 is provided with a clearance structure 23, which not only reduces the weight of the product, but also avoids interference between the heat sink 2 and the top cover;

[0089] (4) Facilitates positioning and avoids incorrect installation of heat sink 2 and circuit board 1;

[0090] (5) Pre-install thermal conductive silicone on heat sink 2 to reduce assembly steps.

[0091] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery management system, characterized in that, include: Circuit board (1); Heat sink (2) is thermally connected to the circuit board (1); The circuit board (1) is provided with at least one nut (3), and the heat sink (2) is provided with a through hole (4) corresponding to the nut (3). The heat sink (2) is fixed to the nut (3) through the through hole (4).

2. The battery management system according to claim 1, characterized in that, The circuit board (1) is provided with at least three nuts (3), and the at least three nuts (3) are arranged asymmetrically.

3. The battery management system according to claim 1, characterized in that, The circuit board (1) is provided with three nuts (3), which are respectively located at one end and the other end of the circuit board (1) along the length direction. The number of nuts (3) at one end is greater than the number of nuts (3) at the other end.

4. The battery management system according to claim 1, characterized in that, The nut (3) includes a base (31) and a guide ring (32) distributed along the axial direction. The guide ring (32) is located on the side of the base (31) facing the heat sink (2). The outer diameter of the base (31) is larger than the inner diameter of the through hole (4), and the outer diameter of the guide ring (32) is smaller than the inner diameter of the through hole (4).

5. The battery management system according to claim 1, characterized in that, The heat sink (2) includes a base plate (21) and a plurality of blades (22) spaced apart from each other. The heat sink (2) also includes a clearance structure (23), which is offset from the blades (22) in the thickness direction of the base plate (21).

6. The battery management system according to claim 5, characterized in that, Along the length direction of the blade (22), the ratio of the length of the clearance structure (23) to the length of the corresponding blade (22) is less than or equal to 1:

9.

7. The battery management system according to claim 1, characterized in that, It also includes thermally conductive adhesive (5), which is connected between the heat sink (2) and the circuit board (1). The circuit board (1) is provided with a plurality of heating elements (7), and the thermally conductive adhesive (5) covers at least the heating elements (7).

8. The battery management system according to claim 1, characterized in that, The nut (3) has a tapered guide opening facing the top of the heat sink (2). The inner diameter of the tapered guide opening at the entrance on the side away from the circuit board (1) is larger than the inner diameter of the tapered guide opening at the exit on the side facing the circuit board (1).

9. The battery management system according to claim 1, characterized in that, The nut (3) has a positioning post on the side facing the circuit board (1), and the circuit board (1) has a positioning hole corresponding to the positioning post. The positioning post is embedded in the positioning hole for fixation.

10. A battery pack, characterized in that, Includes the battery management system as described in any one of claims 1 to 9.

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