Device for securing busbars and battery system

Abstract

The utility model discloses a device and battery system for fixing busbar, device includes: base, the middle area of base along length direction is equipped with the boss along height direction extension, and base is equipped with at least one first through -hole, and first fastener passes first through -hole and will be fixed on the base of external structural member, and the top of boss is equipped with second fastener, and second fastener will be fixed on the boss of busbar, upper cover, with base detachably connected, and upper cover is equipped with at least one empty area, and empty area contains first fastener, and upper cover is equipped with the opening of with boss adaptation. Because upper cover is equipped with empty area, thereby reduced height space, make whole space more simple and compact while, can effectively increase electrical clearance and creepage distance.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a device and battery system for fixing busbars. Background Technology

[0002] A battery pack is a complete battery system that combines battery cells in series or parallel and outputs power via busbars. In practical designs, due to the arrangement of battery cells, the location of the high-voltage distribution box, and the layout of low-voltage connectors, there are often one or more long busbars running through the entire battery pack. Because these busbars play a role in transmitting high current, their structural strength and electrical performance requirements are high, and they cannot be simply replaced by power cables.

[0003] Currently, the industry commonly uses methods such as cable ties or foam clamps to secure long busbars in battery packs or battery clusters. These methods not only fail to provide reliable structural support but also easily lead to insulation wear under vibration, posing a potential short-circuit risk.

[0004] Insulators are typically used for fixing and isolation at critical electrical connection points in current distribution or merging. However, insulators themselves also have the following technical problems: First, their overall height is relatively large, occupying valuable internal space of the battery pack or battery cluster; second, the lack of standardization in the hexagonal side-to-side dimensions of their installation makes it difficult to accurately control the tightening torque, posing a risk of loosening or untightening; third, the single-bolt crimping structure makes it difficult to ensure tight contact between busbars, easily causing problems such as increased contact resistance and excessively rapid local temperature rise, affecting system safety and lifespan. Utility Model Content

[0005] In a first aspect, embodiments of this application provide an apparatus for fixing a busbar, comprising:

[0006] The base has a boss extending in the height direction in the middle area along the length direction, and the base has at least one first through hole. After the first fastener passes through the first through hole, it fixes the base to the external structural component. The top of the boss has a second fastener, which fixes the busbar to the boss.

[0007] The top cover is detachably connected to the base, and the top cover has at least one clearance area that accommodates a first fastener, and the top cover has an opening that matches the boss.

[0008] According to the device for fixing the busbar of this application, since the upper cover is provided with a clearance area that can accommodate the first fastener (e.g., the first bolt), the upper cover can reserve sufficient space in the height direction of the first fastener installed on the base and cover it, thereby reducing the height space, making the overall space more concise and compact, while effectively increasing the electrical clearance and creepage distance.

[0009] In some embodiments, the top of the boss is provided with a limiting notch extending along the outer periphery of the boss, and the upper cover is provided with a limiting protrusion that matches the limiting notch.

[0010] In some embodiments, the top cover has a first protrusion disposed opposite to it in the width direction, and the bottom of the protrusion has a first recess that can engage with the first protrusion; and / or, the top cover has a second hole disposed opposite to it in the length direction, and the base has a second protrusion that can engage with the second hole.

[0011] In some embodiments, the top cover includes a first sidewall and a second sidewall extending along the height direction. The first sidewall is disposed opposite to each other along the width direction and has a first protrusion. The second sidewall is disposed opposite to each other along the length direction and has a second hole.

[0012] In some embodiments, the first sidewall includes a first cantilever, a first protrusion is disposed on the first cantilever, and the second sidewall includes a second cantilever, a second hole is disposed on the second cantilever.

[0013] In some embodiments, the side of the top cover facing the base is provided with a plurality of reinforcing ribs spaced apart.

[0014] In some embodiments, the base has first through holes on both sides along its length; and / or, the top cover has two clearance areas. By providing first through holes on both sides of the base, the base can be fixed to the external structural member using two-point fixing, thus solving the positioning and fixing problem of the device.

[0015] In some embodiments, the first fastener includes a first nut and a first bolt, or a rivet; and / or, the second fastener includes two insert nuts covered by an insulating material of the base.

[0016] In some embodiments, the base has a plurality of grooves of equal wall thickness on the side away from the top cover.

[0017] Secondly, embodiments of this application provide a battery system including at least one battery cell, the battery system comprising:

[0018] Multiple means for fixing a busbar, as described in any embodiment of the first aspect, for fixing a busbar;

[0019] Busbar. Attached Figure Description

[0020] Figure 1 This illustration shows a schematic diagram of a battery system provided according to some embodiments of this application;

[0021] Figure 2 A schematic diagram of a device for fixing a busbar according to some embodiments of this application is shown in the uninstalled state;

[0022] Figure 3 A schematic diagram of a device for fixing a busbar according to some embodiments of this application after installation is shown;

[0023] Figure 4 A schematic diagram of a base provided according to some embodiments of this application is shown. Figure 1 ;

[0024] Figure 5 A schematic diagram of a base provided according to some embodiments of this application is shown. Figure 2 ;

[0025] Figure 6 A schematic diagram of a cover provided according to some embodiments of this application is shown. Figure 1 ;

[0026] Figure 7 A schematic diagram of a cover provided according to some embodiments of this application is shown. Figure 2 ;

[0027] Figure 8 A partial cross-sectional view of a device for fixing a busbar according to some embodiments of this application is shown, in which the busbar is fixed thereon;

[0028] Figure 9 A cross-sectional view along the AA and BB directions is shown of an apparatus for fixing a busbar according to some embodiments of this application. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0034] Firstly, reference Figure 2 and Figure 3 This application provides a device 1 for fixing a busbar, including: a base 10 and a top cover 20, the top cover 20 being detachably connected to the base 10. The base 10 has a boss 11 extending along the height direction Z in its middle region along the length direction X. The base 10 has at least one first through hole 12. In this embodiment, the base 10 has first through holes 12 on both sides along the length direction X. A first fastener 30 (e.g., a bolt, nut, rivet, etc.) passes through the first through hole 12 and fixes the base 10 to an external structural component (e.g., a housing, end plate, bracket, etc.). In this embodiment, the first fastener 30 includes a first bolt 31 and a first nut 32. A second fastener 112 is provided on the top of the boss 11. The second fastener 112 is used to fix the busbar 2 to the boss 11, that is, the busbar 2 can be fixed to the device 1 by the second fastener 112 (e.g., ...). Figure 8 (As shown). In this embodiment, the second fastener 112 includes an insert nut 1121 and is covered by the insulating material of the base 10 (e.g., thermoplastic or thermosetting plastic). In other words, the insert nut 1121 is embedded in and fixed to the boss 11. This configuration allows the use of standard fasteners, enabling standardized operations using tools such as hex wrenches and wrenches, effectively improving efficiency and ensuring torque.

[0035] The upper cover 20 has an opening 26 that matches the boss 11. (Connection) Figure 7 , Figure 8 and Figure 9 As shown, the upper cover 20 is provided with at least one clearance area 21. In this embodiment, the upper cover 20 is provided with two clearance areas 21. The clearance areas 21 are used to accommodate the first fastener 30 (e.g., the first bolt 31).

[0036] According to the device 1 for fixing the busbar of this application, since the upper cover 20 is provided with two clearance areas 21 that can accommodate the first fastener 30 (e.g., the first bolt 31), the upper cover 20 can reserve sufficient space in the height direction Z of the first fastener 30 installed on the base 10 and cover it, thereby reducing the height space and making the overall space more concise and compact, while effectively increasing the electrical clearance and creepage distance; in addition, by providing the first through holes 12 on both sides of the base 10, the base 10 can be fixed to the external structural component by two-point fixing, thus solving the positioning and fixing of the device 1.

[0037] In other words, through the partial clearance design, the top cover 20 does not need to increase its overall wall thickness or structural height to accommodate the first fastener 30. The head of the first fastener 30 is embedded and accommodated within the clearance area 21, achieving space reuse in the height direction Z, thereby effectively reducing the overall profile height of the device 1 and meeting the space requirements for high energy density in applications such as battery packs. Furthermore, after the clearance area 21 of the top cover 20 encloses the fastener, it is equivalent to erecting an "insulating wall" between the fastener and the outside world. At this point, any arc attempting to break through from the fastener to the outside must jump a much longer distance, which greatly increases the difficulty of breakdown and thus improves the withstand voltage rating. Simultaneously, the clearance area 21 creates an "insulating maze." Any possible leakage current attempting to "climb" from the internal fastener to the outside must first climb upwards through the inner wall of the clearance area 21, and then downwards through the outer wall of the clearance area 21. This forced detour is much longer than a straight line, thus significantly improving the resistance to contamination and tracking.

[0038] In some embodiments, reference Figure 4 and Figure 7 The top of the boss 11 is provided with a limiting notch 111 extending along the outer periphery of the boss 11, and the upper cover 20 is provided with a limiting protrusion 22 that matches the limiting notch 111. The limiting notch 111 of the boss 11 and the limiting protrusion 22 of the upper cover 20 form a limiting relationship, thereby restricting the upper cover 20 from moving in five of the six degrees of freedom (i.e., up, down, left, right, forward, and backward) except for movement along the height direction Z away from the base 10. Simultaneously, the mutual cooperation between the limiting notch 111 of the boss 11 and the limiting protrusion 22 of the upper cover 20 cuts off the electrical clearance between the busbar 2 and the first fastener 30, and increases the creepage distance, thereby raising the operating voltage of the device 1, enabling it to be compatible with a wider range of voltages and applicable to more usage scenarios.

[0039] In some embodiments, continue to refer to Figure 4 and Figure 7 and combined Figure 6 and Figure 9The upper cover 20 has a first protrusion 2311 arranged opposite each other along the width direction Y, and the bottom of the boss 11 has a first recess 113 that can engage with the first protrusion 2311; and / or, the upper cover 20 has a second hole 2411 arranged opposite each other along the length direction X, and the base 10 has a second protrusion 114 that can engage with the second hole 2411. Through the engagement of the first protrusion 2311 and the first recess 113, and / or the engagement of the second protrusion 114 and the second hole 2411, the upper cover 20 and the base 10 can be connected relatively stably. In this embodiment, the boss 11 also has a guide groove 115. During the installation of the upper cover 20 and the base 10, the first protrusion 2311 of the upper cover 20 is guided by the guide groove 115 and then smoothly engages with the first recess 113 located at the bottom of the boss 11, which can reduce the length of the bending deformation of the first protrusion 2311 of the upper cover 20 during assembly.

[0040] In some embodiments, the top cover 20 includes a first sidewall 23 and a second sidewall 24 extending along the height direction Z. The first sidewall 23 is disposed opposite to each other along the width direction Y, and a first protrusion 2311 is provided on the first sidewall 23. The second sidewall 24 is disposed opposite to each other along the length direction X, and a second hole 2411 is provided on the second sidewall 24.

[0041] In some embodiments, the first sidewall 23 includes a first cantilever 231, and a first protrusion 2311 is disposed on the first cantilever 231; the second sidewall 24 includes a second cantilever 241, and a second hole 2411 is disposed on the second cantilever 241. The second hole 2411 can be a through hole or a blind hole, and is not specifically limited here. With this configuration, during the process of installing the upper cover 20 onto the base 10, the first protrusion 2311 or the second hole 2411 can undergo elastic deformation and maintain structural rigidity, avoiding rigid contact of "hard against hard", preventing assembly difficulties caused by tolerance accumulation, parts not being able to be installed in place, or excessive internal stress caused by forced assembly; at the same time, the elastic deformation of the cantilever can compensate for certain dimensional errors, so the absolute machining accuracy requirements of the first protrusion 2311 and the second hole 2411 can be appropriately relaxed, reducing production costs.

[0042] In some embodiments, the upper cover 20 has multiple reinforcing ribs 25 spaced apart on the side facing the base 10 to maintain structural strength, prevent uneven wall thickness, and provide a large enough clearance area. This is because if the upper cover 20 does not have reinforcing ribs 25, the inner side of the upper cover 20 needs to be thickened to ensure structural strength, resulting in uneven wall thickness (i.e., inconsistent thickness on the five sides), which would lead to significant shrinkage and potential high internal stress in the injection molded part. In addition, thickening the inner side of the upper cover 20 would encroach on the space of the internal clearance area 21, potentially reducing the space and making it impossible to accommodate the first bolt 31 or the first nut 32. In this embodiment, the multiple reinforcing ribs 25 are spaced apart along the width direction Y and the length direction X.

[0043] In some embodiments, the second fastener 112 provided on the boss 11 includes two insert nuts 1121. Since the boss 11 is provided with two insert nuts 1121, the busbar 2 can be fixed by a double bolt structure, which increases the effective contact area of ​​the busbar 2, thereby reducing the contact internal resistance and reducing the overcurrent temperature rise at the contact point.

[0044] In some embodiments, reference Figure 5 The base 10 has multiple grooves 13 of equal wall thickness on the side away from the top cover 20. This design can prevent structural defects or functional defects caused by uneven wall thickness of the base 10, such as shrinkage or cracking.

[0045] Secondly, refer to Figure 1 This application also provides a battery system including at least one battery cell. The battery system includes: a plurality of devices 1 and busbars 2 for fixing busbars as described in any of the first aspects, wherein the device 1 is used to fix the busbars 2. In other words, for long-distance busbars 2, multiple devices 1 can be provided to provide support, thereby improving stability while ensuring the compactness of the overall battery system structure; in addition, the busbars 2 are fixed with double bolts at the joint, thereby increasing the effective contact area of ​​the joint surface, reducing the contact internal resistance, and thus reducing the temperature rise at the joint.

[0046] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A device for fixing a busbar, characterized in that, include: The base has a boss extending in the height direction in the middle area along the length direction, and the base has at least one first through hole. A first fastener passes through the first through hole and fixes the base to an external structural member. A second fastener is provided on the top of the boss and fixes the busbar to the boss. The top cover is detachably connected to the base, the top cover has at least one clearance area that accommodates the first fastener, and the top cover has an opening that matches the boss.

2. The device for fixing a busbar as described in claim 1, characterized in that, The top of the boss is provided with a limiting notch extending along the outer periphery of the boss, and the upper cover is provided with a limiting protrusion that matches the limiting notch.

3. The device for fixing a busbar as described in claim 1, characterized in that, The upper cover has a first protrusion that is opposite to the upper cover in the width direction, and the bottom of the protrusion has a first recess that can engage with the first protrusion. Alternatively, the upper cover has a second hole that is opposite to the upper cover in the length direction, and the base has a second protrusion that can engage with the second hole.

4. The device for fixing a busbar as described in claim 3, characterized in that, The top cover includes a first sidewall and a second sidewall extending along the height direction. The first sidewall is disposed opposite to each other along the width direction and has a first protrusion. The second sidewall is disposed opposite to each other along the length direction and has a second hole.

5. The device for fixing a busbar as described in claim 4, characterized in that, The first sidewall includes a first cantilever, and the first protrusion is disposed on the first cantilever. The second sidewall includes a second cantilever, and the second hole is disposed on the second cantilever.

6. The device for fixing a busbar as described in claim 1, characterized in that, The side of the top cover facing the base is provided with multiple reinforcing ribs at intervals.

7. The device for fixing a busbar as described in claim 1, characterized in that, The base is provided with the first through hole on both sides along the length direction; and / or, the upper cover is provided with two clearance areas.

8. The device for fixing a busbar as described in claim 1, characterized in that, The first fastener includes a first nut and a first bolt, or a rivet; and / or, the second fastener includes two insert nuts, which are covered by the insulating material of the base.

9. The device for fixing a busbar as described in claim 1, characterized in that, The base has multiple grooves of equal wall thickness on the side away from the top cover.

10. A battery system comprising at least one battery cell, characterized in that, include: A plurality of means for fixing a busbar as described in any one of claims 1 to 9, for fixing the busbar; Busbar.

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