Mounting structure for pre-charge resistor in battery pack circuit breaking unit

Abstract

The application provides a mounting structure for a pre-charging resistor in a battery pack circuit breaking unit, and belongs to the technical field of battery pack circuit breaking units. In view of the poor mounting stability of the pre-charging resistor in the battery pack circuit breaking unit, the application provides a mounting structure, which comprises a containing groove, the opposite ends of the containing groove are respectively provided with buckles, the buckles have limiting surfaces facing the bottom of the containing groove; the bottom of the containing groove is provided with a first elastic arm, the first elastic arm applies a pushing force to the pre-charging resistor in the containing groove towards the limiting surface of the buckle, and cooperates with the limiting surface to realize clamping of the pre-charging resistor in the vertical direction; the containing groove is provided with limiting ribs close to the two buckles, and the limiting ribs arranged oppositely cooperate to realize clamping of the pre-charging resistor in the first direction; the opposite sides of the containing groove are respectively provided with second elastic arms, and the second elastic arms arranged oppositely cooperate to realize clamping of the pre-charging resistor in the second direction. The application realizes clamping of the pre-charging resistor in the vertical direction and the horizontal direction through the containing groove, the buckle, the first elastic arm, the limiting rib and the second elastic arm, so that the mounting stability of the pre-charging resistor is improved.

Description

Technical Field

[0001] This application relates to the field of battery pack circuit breaker technology, and more particularly to a mounting structure for a pre-charge resistor in a battery pack circuit breaker. Background Technology

[0002] The Battery Disconnect Unit (BDU) is used to control the on / off state of the high-voltage circuit of the battery pack and is a key component for ensuring battery pack safety. The BDU includes a main relay, fuse, pre-charge relay, and pre-charge resistor. The pre-charge resistor is usually fixed inside the BDU housing with screws, which makes installation inconvenient.

[0003] To address the aforementioned issues, existing technologies have also made corresponding improvements. For example, Chinese patent application CN209860095U, published on December 27, 2019, discloses an adaptive snap-fit ​​structure for the pre-charge resistance of a battery pack circuit breaker unit. This structure includes a middle shell body, which has a component elastic slot and an adaptive snap-fit ​​part. The adaptive snap-fit ​​part includes a first adaptive snap and a second adaptive snap, which are disposed opposite to each other within the component elastic slot. A first spring tab groove and a second spring tab groove are formed opposite to each other on the inner wall of the component elastic slot. A first adaptive abutment piece extends from the inner wall of the first spring tab groove, and a second adaptive abutment piece extends from the inner wall of the second spring tab groove. The adaptive snap-fit ​​structure for the pre-charge resistance of a battery pack circuit breaker unit described in this invention uses a pair of elastic snaps and a pair of elastic abutment pieces to achieve elastic snap-fit ​​and elastic abutment for different pre-charge resistances, thereby adapting to pre-charge resistances of different sizes. The drawback of this solution is that the horizontal and vertical limits of the pre-charge resistor are insufficient, resulting in low installation stability of the pre-charge resistor. Utility Model Content

[0004] The purpose of this application is to solve the problem of poor installation stability of the pre-charge resistor in the battery pack circuit breaker unit in the prior art. Therefore, this application provides an installation structure for the pre-charge resistor in the battery pack circuit breaker unit, which uses a receiving groove, a buckle, a first elastic arm, a limiting rib, and a second elastic arm to clamp the pre-charge resistor in the vertical and horizontal directions, thereby improving the installation stability of the pre-charge resistor.

[0005] This application provides a mounting structure for a pre-charge resistor in a battery pack circuit breaker unit, including a receiving groove for accommodating the pre-charge resistor. The receiving groove has two opposite ends disposed along a first direction and two opposite sides disposed perpendicular to the first direction.

[0006] The receiving groove is provided with buckles at its opposite ends, and the buckles have limiting surfaces facing the bottom of the receiving groove;

[0007] The bottom of the receiving groove is provided with a first elastic arm. The first elastic arm applies a pushing force toward the limiting surface of the buckle to the pre-charged resistor located in the receiving groove, and cooperates with the limiting surface to clamp the pre-charged resistor in the vertical direction.

[0008] The receiving groove is provided with limiting ribs near the two buckles, and the oppositely provided limiting ribs cooperate to clamp the pre-charge resistor located in the receiving groove in the first direction.

[0009] The receiving groove is provided with a second elastic arm on each of its opposite sides. The oppositely arranged second elastic arms cooperate to clamp the pre-charge resistor located in the receiving groove in the second direction.

[0010] By employing the above technical solution, the pre-charge resistor is fixed within the receiving groove by snap-fit ​​fasteners positioned at opposite ends of the receiving groove, improving the ease of installation. The pre-charge resistor is clamped vertically by the cooperation of the first elastic arm and the limiting surface of the snap-fit ​​fasteners, thus improving the vertical installation stability of the pre-charge resistor. Furthermore, the limiting ribs positioned at opposite ends of the receiving groove ensure an interference fit between the space of the receiving groove in the first direction and the size of the pre-charge resistor, effectively clamping the pre-charge resistor in the first direction. The limiting ribs are separate from the snap-fit ​​fasteners, ensuring the installation stability of the pre-charge resistor in both the first and vertical directions. Simultaneously, the second elastic arms positioned on opposite sides of the receiving groove cooperate to clamp the pre-charge resistor in the second direction, further improving its installation stability in that direction. The different clamping methods in the first and second directions, achieved by the fixed limiting ribs and the elastic second elastic arms, ensure clamping stability in both directions while avoiding significant resistance during installation.

[0011] In some embodiments, the limiting rib has a first guide surface such that the pre-charge resistor can be embedded into the receiving groove along the first guide surface.

[0012] In some embodiments, a limiting rib is provided on each side of the buckle.

[0013] In some embodiments, the bottom of the receiving groove is symmetrically provided with a through area, and two first elastic arms are symmetrically provided, each located within the corresponding through area.

[0014] By adopting the above technical solution, the heat dissipation effect of the pre-charge resistor can be improved through the through area, and space can be provided for the installation of the first elastic arm, thus controlling the overall volume.

[0015] In some embodiments, the first elastic arm has a first protrusion that abuts against the bottom protrusion of the precharge resistor.

[0016] By adopting the above technical solution, the first protrusion cooperates with the bottom protrusion of the pre-charge resistor, which allows for a larger gap between the first elastic arm and the bottom of the pre-charge resistor, thereby improving the heat dissipation effect of the pre-charge resistor.

[0017] In some embodiments, the second elastic arm has a second protrusion for abutting against the sidewall of the precharge resistor.

[0018] In some embodiments, the second protrusion has a second guide surface such that the precharge resistor can be embedded into the receiving groove along the second guide surface.

[0019] In some embodiments, the latch has a third guide surface such that the precharge resistor can be embedded into the receiving groove along the third guide surface.

[0020] In some embodiments, a disassembly aid is further provided that can conform to the bottom and side surfaces of the receiving groove along the second direction. The disassembly aid includes a bottom and handles located on opposite sides of the bottom. The handles protrude from the receiving groove at a first height and are used to allow the user to pull up the bottom so that the bottom drives the pre-charge resistor located thereon to disengage from the receiving groove when any of the latches is released from engaging the pre-charge resistor.

[0021] By adopting the above technical solution, the pre-charge resistor can be easily removed in a confined space by disassembling the auxiliary parts, which improves the convenience of replacing and maintaining the pre-charge resistor.

[0022] In some embodiments, the disassembly aid is a flexible component, and the receiving groove is symmetrically provided with mounting areas extending along the second direction on opposite sides, and a vertical limiting hole is provided above the mounting area;

[0023] The bottom is fitted to the inner bottom surface of the receiving groove, and the handle passes through the mounting area and through the vertical limiting hole and fits against the outer side surface of the receiving groove.

[0024] By adopting the above technical solution, the heat dissipation effect of the precharge resistor is improved by the installation area through which the receiving groove runs along the second direction; and the handle of the disassembly auxiliary part is connected to the vertical limiting hole on the outside of the receiving groove by passing through the installation area, which improves the reliability of the connection between the disassembly auxiliary part and the receiving groove, and reduces the possibility of squeezing the handle during the installation of the precharge resistor, which may cause it to move or be folded, thus facilitating subsequent disassembly and use.

[0025] Other features of this application and the corresponding beneficial effects are described in the following part of the specification, and it should be understood that at least some of the beneficial effects are obvious from the description in the specification of this application. Brief Description of the Drawings

[0026] Figure 1 is a diagram showing the usage state of this application;

[0027] Figure 2 is Figure 1 a partially sectional schematic view of

[0028] Figure 3 is a schematic structural view of this application.

[0029] Description of the Reference Numerals in the Drawings:

[0030] 1. Pre-charge resistor; 11. Protrusion;

[0031] 100. Accommodating groove; 101. Through area; 102. Installation area;

[0032] 110. Snap; 111. Third guiding surface;

[0033] 120. First elastic arm; 121. First protrusion;

[0034] 130. Limiting rib; 131. First guiding surface;

[0035] 140. Second elastic arm;​​​​​​​​​​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.

[0039] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Please see Figure 1-3 , Figure 1 This is a diagram illustrating the usage status of this application; Figure 2 for Figure 1 Partial sectional view; Figure 3 This is a schematic diagram of the structure of this application.

[0041] This application provides a mounting structure for a pre-charge resistor in a battery pack circuit breaker unit. This mounting structure is disposed within the battery pack circuit breaker unit and is preferably integrally injection molded with the housing of the battery pack circuit breaker unit, thereby facilitating manufacturing.

[0042] This mounting structure includes a receiving groove 100 for accommodating a pre-charged resistor 1, the receiving groove 100 having opposite ends disposed along a first direction and opposite sides disposed in a second direction perpendicular to the first direction.

[0043] The receiving groove 100 is provided with buckles 110 at opposite ends, that is, the pre-charge resistor 1 is fixed in the receiving groove 100 by snapping together by the buckles 110 at opposite ends of the receiving groove 100, which improves the ease of installation of the pre-charge resistor 1. Preferably, the buckles 110 have a limiting surface facing the bottom of the receiving groove 100.

[0044] The bottom of the receiving groove 100 is provided with a first elastic arm 120. The first elastic arm 120 applies a pushing force toward the limiting surface of the buckle 110 to the pre-charge resistor 1 located in the receiving groove 100, and cooperates with the limiting surface to clamp the pre-charge resistor 1 in the vertical direction, thereby improving the installation stability of the pre-charge resistor 1 in the vertical direction.

[0045] Limiting ribs 130 are provided near both latches 110 in the receiving groove 100. This ensures that the space of the receiving groove 100 in the first direction is an interference fit with the size of the pre-charge resistor 1. The corresponding limiting ribs 130 clamp the pre-charge resistor 1 located in the receiving groove 100 in the first direction, thereby improving the installation stability of the pre-charge resistor 1 in the first direction. Furthermore, the limiting ribs 130 and latches 110 are separately provided and do not affect each other, ensuring the stability of the interference fit formed by the limiting ribs 130 and that the latches 110 are only subjected to vertical force after being engaged, thereby ensuring the installation stability of the pre-charge resistor 1 in both the first and vertical directions.

[0046] Second elastic arms 140 are respectively provided on opposite sides of the receiving groove 100. The oppositely arranged second elastic arms 140 cooperate to clamp the pre-charge resistor 1 located in the receiving groove 100 in the second direction, thereby improving the installation stability of the pre-charge resistor 1 in the second direction. Furthermore, the first direction and the second direction are clamped differently by the fixed limiting rib 130 and the elastic second elastic arms 140, which can ensure the clamping stability in both directions and avoid causing great resistance to installation.

[0047] In one embodiment, a limiting rib 130 is provided on each side of the buckle 110, thereby improving the clamping stability of the pre-charge resistor 1 in the first direction and improving the strength of the side wall of the receiving groove 100 where the buckle 110 is provided.

[0048] In one embodiment, the bottom of the receiving groove 100 is symmetrically provided with a through region 101, and two first elastic arms 120 are symmetrically provided and located in the corresponding through region 101. Thus, the bottom of the pre-charge resistor 1 can be connected to the outside through the through region 101, thereby improving the heat dissipation effect of the pre-charge resistor 1. In addition, the through region 101 also provides space for the installation of the first elastic arms 120, avoiding the bottom of the receiving groove 100 from being too thick and controlling the overall volume.

[0049] In one embodiment, the first elastic arm 120 has a first protrusion 121, which is used to abut against the bottom 151 protrusion 11 of the pre-charge resistor 1. That is, the first protrusion 121 cooperates with the bottom 151 protrusion 11 of the pre-charge resistor 1. By the two protrusions abutting and cooperating, the first elastic arm 120 is bent and deformed, so that there is a large gap between the first elastic arm 120 and the bottom 151 of the pre-charge resistor 1, thereby improving the heat dissipation effect of the pre-charge resistor 1.

[0050] In one embodiment, the second elastic arm 140 has a second protrusion 141 for abutting against the sidewall of the pre-charge resistor 1, that is, the second elastic arm 140 has a protrusion facing the inside of the receiving groove 100, thereby clamping the pre-charge resistor 1 by deformation.

[0051] In one embodiment, the limiting rib 130 has a first guide surface 131 such that the precharge resistor 1 can be embedded into the receiving groove 100 along the first guide surface 131.

[0052] In one embodiment, the second protrusion 141 has a second guide surface 142 such that the precharge resistor 1 can be embedded into the receiving groove 100 along the second guide surface 142.

[0053] In one embodiment, the snap 110 has a third guide surface 111 such that the precharge resistor 1 can be inserted into the receiving groove 100 along the third guide surface 111.

[0054] It should be noted that the internal components of the battery pack circuit breaker unit are installed compactly. The pre-charge resistor 1 is usually installed at the edge of the housing, and the distance between it and the side wall of the housing is very narrow. A pre-charge relay is set at one end, and a connector is set above the other end. Due to the narrow operating space, it is usually difficult to unlock the latches 110 set at both ends of the receiving slot 100 at the same time to remove the pre-charge resistor 1.

[0055] Therefore, to improve the ease of disassembling the pre-charge resistor 1, in one embodiment, the mounting structure further includes a disassembly aid 150 that can conform to the bottom and sides of the receiving groove 100 along the second direction. The disassembly aid 150 includes a bottom 151 and handles 152 located on opposite sides of the bottom 151. The handles 152 protrude from the receiving groove 100 at a first height and are used by the user to pull upwards when any of the latches 110 releases the pre-charge resistor 1, so that the bottom 151 drives the pre-charge resistor 1 located thereon to disengage from the receiving groove 100, thereby facilitating the disassembly of the pre-charge resistor 1 in a confined space and improving the convenience of replacing and maintaining the pre-charge resistor 1.

[0056] In one embodiment, mounting areas 102 extending along a second direction are symmetrically arranged on opposite sides of the receiving groove 100, thereby allowing the sidewall of the pre-charge resistor 1 to communicate with the outside, further improving the heat dissipation effect of the pre-charge resistor 1.

[0057] In one embodiment, a vertical limiting hole is provided above the mounting area 102. The disassembly aid 150 is a flexible component, with its bottom 151 conforming to the inner bottom surface of the receiving groove 100. The handle 152 passes through the mounting area 102 and the vertical limiting hole, and conforms to the outer surface of the receiving groove 100. This improves the reliability of the connection between the disassembly aid 150 and the receiving groove 100, and reduces the possibility of the handle 152 being squeezed during the installation of the pre-charge resistor 1, causing it to move or be folded, thus facilitating subsequent disassembly and use.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A mounting structure for a pre-charge resistor in a battery pack circuit breaker unit, characterized in that, It includes a receiving groove for accommodating a pre-charged resistor, the receiving groove having opposite ends disposed along a first direction, and opposite sides disposed along a second direction perpendicular to the first direction; and, The receiving groove is provided with buckles at its opposite ends, and the buckles have limiting surfaces facing the bottom of the receiving groove; The bottom of the receiving groove is provided with a first elastic arm. The first elastic arm applies a pushing force toward the limiting surface of the buckle to the pre-charged resistor located in the receiving groove, and cooperates with the limiting surface to clamp the pre-charged resistor in the vertical direction. The receiving groove is provided with limiting ribs near the two buckles, and the oppositely provided limiting ribs cooperate to clamp the pre-charge resistor located in the receiving groove in the first direction. The receiving groove is provided with a second elastic arm on each of its opposite sides. The oppositely arranged second elastic arms cooperate to clamp the pre-charge resistor located in the receiving groove in the second direction.

2. The mounting structure for the pre-charge resistor in the battery pack circuit breaker unit according to claim 1, characterized in that, The limiting rib has a first guide surface, so that the pre-charge resistor can be embedded into the receiving groove along the first guide surface.

3. The mounting structure for the pre-charge resistor in the battery pack circuit breaker unit according to claim 1, characterized in that, A limiting rib is provided on each side of the buckle.

4. The mounting structure for the pre-charge resistor in the battery pack circuit breaker unit according to claim 1, characterized in that, The bottom of the receiving groove is symmetrically provided with a through area, and two first elastic arms are symmetrically provided, each located in the corresponding through area.

5. The mounting structure for the pre-charge resistor in the battery pack circuit breaker unit according to claim 4, characterized in that, The first elastic arm has a first protrusion that abuts against the bottom protrusion of the precharge resistor.

6. The mounting structure for the pre-charge resistor in a battery pack circuit breaker unit according to claim 1, characterized in that, The second elastic arm has a second protrusion for abutting against the sidewall of the precharge resistor.

7. The mounting structure for the pre-charge resistor in a battery pack circuit breaker unit according to claim 6, characterized in that, The second protrusion has a second guide surface such that the pre-charge resistor can be embedded into the receiving groove along the second guide surface.

8. The mounting structure for the pre-charge resistor in a battery pack circuit breaker unit according to claim 1, characterized in that, The buckle has a third guide surface so that the pre-charge resistor can be embedded into the receiving groove along the third guide surface.

9. The mounting structure for the pre-charge resistor in a battery pack circuit breaker unit according to any one of claims 1-8, characterized in that, It also includes a disassembly aid that can fit against the bottom and sides of the receiving groove along the second direction. The disassembly aid includes a bottom and handles located on opposite sides of the bottom. The handles protrude from the receiving groove at a first height and are used to allow the user to pull up when any of the latches are released from engaging the pre-charge resistor, so that the bottom drives the pre-charge resistor located thereon to disengage from the receiving groove.

10. The mounting structure for the pre-charge resistor in a battery pack circuit breaker unit according to claim 9, characterized in that, The disassembly aid is a flexible component, and the receiving groove has symmetrically arranged installation areas that extend along the second direction on opposite sides, with a vertical limiting hole above the installation area. The bottom is fitted to the inner bottom surface of the receiving groove, and the handle passes through the mounting area and through the vertical limiting hole and fits against the outer side surface of the receiving groove.

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