Injection molded housing and battery pack circuit breaker unit

Abstract

This application provides an injection-molded housing and a battery pack circuit breaker unit, belonging to the field of battery pack technology. Addressing the problem of inconvenient assembly of cross-regional copper busbars between different functional units within a battery pack, this application provides an injection-molded housing, including a housing body and a fixing assembly for fixing the copper busbars. The fixing assembly includes a mounting base, a mounting component, and a locking component. The mounting base is integrally injection-molded with the outer wall of the housing body. A limiting cavity is formed below the mounting base, and symmetrical clearance grooves are arranged circumferentially within the limiting cavity. A snap-fit ​​arm is provided within the clearance groove, and a snap-fit ​​block is provided at the end of the snap-fit ​​arm. A clearance hole is also provided at the top of the limiting cavity. The mounting component includes a limiting part and a connecting part located on the limiting part. The limiting part is adapted to the limiting cavity, and the limiting part can extend into the limiting cavity through the snap-fit ​​block, allowing the connecting part to pass through the clearance hole. The connecting part is used to insert into the mounting hole of the copper busbar, and the locking component is used to thread-connect with the connecting part, fixing the copper busbar between the limiting part and the locking component. Furthermore, the limiting cavity and the snap-fit ​​block cooperate to restrict the circumferential and axial movement of the limiting part located within the limiting cavity. This application improves the ease of assembling the copper busbar and the injection-molded housing by setting a fixing component on the outside of the housing body, and by having the fixing component's mounting part snap into the mounting base, and by restricting the circumferential movement of the mounting part by the mounting base.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to injection-molded housings and battery pack circuit breaker units. 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 is integrated within the battery pack, which typically also integrates other functional units. Depending on the layout requirements, different functional units may have copper busbars spanning different areas. In such cases, a supporting and fixing structure needs to be installed on the housing of the functional unit located in the area it spans.

[0003] Typically, the housings of the battery pack circuit breaker unit and other functional units within the battery pack are injection molded. During the design process, a support base is formed on the outside of the housing through injection molding, and the cross-regional copper busbars are assembled with bolts. However, this method of assembly is inconvenient and has limited support strength for the copper busbars, which can easily lead to damage to the housing. Utility Model Content

[0004] The purpose of this application is to solve the problem of inconvenient assembly of cross-regional copper busbars between different functional units inside a battery pack in the prior art. Therefore, this application provides an injection-molded housing, which improves the ease of assembly of the copper busbars and the injection-molded housing by setting a fixing component on the outside of the housing body, and by the mounting part of the fixing component engaging with the mounting base, and by the mounting base restricting the circumferential movement of the mounting part.

[0005] This application provides an injection molded housing, including a housing body and a fixing assembly for fixing copper busbars, wherein the fixing assembly includes a mounting base, a mounting component, and a locking component;

[0006] The mounting base is integrally injection molded with the outer wall of the shell body. A limiting cavity is formed below the mounting base. A clearance groove is symmetrically arranged in the circumferential direction of the limiting cavity. A snap-fit ​​arm is arranged in the clearance groove. A snap-fit ​​block is arranged at the end of the snap-fit ​​arm. A clearance hole is also provided at the top of the limiting cavity.

[0007] The mounting component includes a limiting part and a connecting part located on the limiting part. The limiting part is adapted to the limiting cavity, and the limiting part can extend into the limiting cavity through the locking block and allow the connecting part to pass through the clearance hole.

[0008] The connecting part is used to insert into the mounting hole of the copper busbar, and the locking member is used to be threadedly connected to the connecting part, thereby fixing the copper busbar between the limiting part and the locking member; and,

[0009] The limiting cavity and the locking block cooperate to restrict the circumferential and axial movement of the limiting part located within the limiting cavity.

[0010] By adopting the above technical solution, the mounting component and the mounting base are snapped together by the snap-fit ​​arm and snap-fit ​​block, which improves the ease of assembly of the two and thus improves the ease of cross-regional copper busbar assembly between different functional units inside the battery pack. In addition, the circumferential movement of the mounting component is restricted by the limiting cavity of the mounting base, that is, the rotation of the mounting component is restricted, which can prevent the mounting component from rotating when it is subjected to tightening operation, thereby facilitating the tightening operation of the locking component and the mounting component, and further improving the ease of copper busbar assembly.

[0011] In some embodiments, the circumferential cross-section of the limiting cavity is rectangular, and the circumferential cross-section of the limiting portion of the mounting member is a rectangle adapted to the limiting cavity, so that the limiting cavity and the limiting portion cooperate to restrict the circumferential rotation of the mounting member;

[0012] The top of the limiting cavity has a horizontal limiting part, and the middle of the horizontal limiting part is provided with the clearance hole, so that the horizontal limiting part and the locking block cooperate to restrict the axial movement of the mounting part.

[0013] The above technical solution uses a rectangular structure to limit the rotation of the mounting component. The structure is simple, easy to manufacture, and has a good limiting effect.

[0014] In some embodiments, the mounting member is a metal part, and a support part is further provided between the limiting part and the connecting part. The support part can pass through the clearance hole of the mounting base, and the top surface of the support part protrudes from the clearance hole to contact and support the copper busbar.

[0015] By adopting the above technical solution, the copper busbar is contacted and supported by the metal support part, and the copper busbar is clamped in cooperation with the locking part. This avoids the plastic mounting base directly supporting and clamping the copper busbar in cooperation with the locking part, thus preventing the mounting base from being cracked and damaged. This ensures the reliability of the copper busbar installation and extends the service life of the injection molded housing.

[0016] In some embodiments, the mounting base is provided with a buffer washer around the clearance hole in the circumferential direction. The buffer washer is integrally injection molded with the mounting base, and the top surface of the buffer washer is flush with the top surface of the support portion.

[0017] By adopting the above technical solution, the support area of ​​the copper busbar is increased by setting a plastic buffer washer in the circumferential direction of the support part, thereby improving the installation stability of the copper busbar. At the same time, the buffer washer can enhance the strength of the mounting base and prevent the part from being crushed.

[0018] In some embodiments, the end of the card block opposite to the clearance hole is provided with a guide surface to guide the limiting portion of the mounting member to the limiting cavity of the mounting base.

[0019] In some embodiments, the end of the card block near the clearance hole is provided with an abutment surface, the abutment surface is parallel to the horizontal limiting part of the limiting cavity, and the abutment surface is flush with the bottom surface of the limiting cavity.

[0020] This application also provides a battery pack circuit breaker unit, including any of the injection-molded housings described above.

[0021] By adopting the above technical solution, the mounting component and the mounting base are snapped together by the snap-fit ​​arm and snap-fit ​​block, which improves the ease of assembly of the two, thereby improving the ease of assembly of the copper busbar on the outside of the battery pack circuit breaker unit. In addition, the circumferential movement of the mounting component is restricted by the limiting cavity of the mounting base, that is, the rotation of the mounting component is restricted, which can prevent the mounting component from rotating when it is subjected to tightening operation, thereby facilitating the tightening operation of the locking component and the mounting component, and further improving the ease of copper busbar assembly.

[0022] In some embodiments, the injection-molded housing is provided with a wire harness outlet communicating with the outside, a wire harness plug is provided at the wire harness outlet, and a plug-in structure and a locking structure are provided between the wire harness outlet and the wire harness plug, and the wire harness plug is fixed to the wire harness outlet by the plug-in structure and the locking structure.

[0023] By adopting the above technical solution, the assembly convenience and reliability of the injection-molded housing of the wiring harness plug and the battery pack circuit breaker unit are improved through the plug-in structure and locking structure.

[0024] In some embodiments, the plug-in structure includes a boss disposed at the outlet of the wire harness and a groove disposed at the plug of the wire harness. Two bosses and two grooves are symmetrically disposed on both sides along the plug-in direction. The cross sections of the bosses and grooves perpendicular to the plug-in direction are adapted L-shaped, and the two are cross-clamped when plugged in.

[0025] A first blocking part is provided at one end of the groove, and the blocking part is used to abut against one end of the boss;

[0026] The locking structure includes an elastic arm disposed at the outlet of the wire harness and a second blocking portion disposed at the plug of the wire harness. The second blocking portion is disposed away from the first blocking portion, and the end of the elastic arm can abut against the second blocking portion and cooperate with the first blocking portion to restrict the movement of the plug of the wire harness along the insertion direction.

[0027] In some embodiments, the end of the elastic arm is provided with a guide surface.

[0028] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this application;

[0030] Figure 2 This is a side view of the present application;

[0031] Figure 3 This is a top view of the present application;

[0032] Figure 4 for Figure 3 Schematic diagram of section AA;

[0033] Figure 5 for Figure 3 A partial cross-sectional diagram of BB;

[0034] Figure 6 This is a partially enlarged structural diagram of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Housing body; 110. Wiring harness outlet; 111. Boss; 112. Flexible arm; 120. Wiring harness plug; 121. First blocking part; 122. Second blocking part;

[0037] 200. Mounting base; 210. Limiting cavity; 211. Clearance groove; 212. Horizontal limiting part; 220. Clearance hole; 221. Buffer washer; 230. Snap-fit ​​arm; 231. Snap-fit ​​block;

[0038] 300. Mounting component; 310. Limiting part; 320. Supporting part; 330. Connecting part. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0040] 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.

[0041] 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.

[0042] Please see Figure 1-6 , Figure 1 This is a schematic diagram of the structure of this application, and specifically, the injection-molded housing is used for the battery pack circuit breaker unit; Figure 2 This is a side view of the present application; Figure 3 This is a top view of the present application; Figure 4 for Figure 3 Schematic diagram of section AA; Figure 5 for Figure 3 A partial cross-sectional diagram of BB; Figure 6 This is a partially enlarged structural diagram of this application.

[0043] Example 1:

[0044] This application provides an injection molded housing, including a housing body 100 and a fixing component for fixing copper busbars. The injection molded housing is particularly suitable for functional units within a battery pack, such as the housing of a battery pack circuit breaker unit. The fixing component facilitates the assembly of cross-region copper busbars between different functional units within the battery pack.

[0045] Specifically, the fixing components include a mounting base 200, a mounting element 300, and a locking element.

[0046] The mounting base 200 and the outer wall of the housing body 100 are integrally injection molded, specifically made of plastic. The integral injection molding of the two can ensure the integrity of the injection molded housing.

[0047] A limiting cavity 210 is formed below the mounting base 200. A clearance hole 220 is provided at the top of the limiting cavity 210, so that the mounting member 300 can be partially inserted into the limiting cavity and partially pass through the clearance hole 220, located outside the mounting base 200, and thus connected to the external copper busbar.

[0048] The limiting cavity 210 is symmetrically provided with clearance grooves 211 in the circumferential direction. A snap-fit ​​arm 230 is provided within the clearance groove 211, and a snap-fit ​​block 231 is provided at the end of the snap-fit ​​arm 230. That is, the mounting component 300 and the mounting base 200 are snapped together through the elastic deformation of the snap-fit ​​arm 230 and the restriction of the snap-fit ​​block 231, improving the ease of assembly and thus improving the ease of assembling cross-regional copper busbars between different functional units within the battery pack. In particular, external copper busbars are usually installed after the functional units are installed in the battery pack, resulting in limited operating space at the bottom of the mounting base 200, making it difficult to install bolts from the bottom of the mounting base 200 upwards using screwdrivers or other tools. However, the mounting component 300 of this injection-molded housing can move directly upwards from the bottom of the mounting base 200 and snap into it, making operation convenient and requiring less operating space.

[0049] The mounting component 300 includes a limiting part 310 and a connecting part 330 located on the limiting part 310. The limiting part 310 is adapted to the limiting cavity 210, and the limiting part 310 can extend into the limiting cavity 210 through the locking block 231 and allow the connecting part 330 to pass through the clearance hole 220.

[0050] The connecting part 330 is used to insert into the mounting hole of the copper busbar, and the locking member is used to thread into the connecting part 330 and fix the copper busbar between the limiting part 310 and the locking member. Preferably, the locking member is a nut.

[0051] Furthermore, the limiting cavity 210 and the locking block 231 cooperate to restrict the circumferential and axial movement of the limiting part 310 located within the limiting cavity 210. Specifically, the limiting cavity 210 and the locking block 231 restrict the axial movement of the limiting part 310 located therein, that is, restrict the vertical movement of the mounting part 300; the limiting cavity 210 of the mounting base 200 restricts the circumferential movement of the mounting part 300, that is, restricts the horizontal movement and rotation of the mounting part 300. In particular, it can prevent the mounting part 300 from rotating when subjected to tightening operation, thereby facilitating the tightening operation of the locking part and the mounting part 300, and further improving the ease of copper busbar assembly.

[0052] In one embodiment, the circumferential cross-section of the limiting cavity 210 is a polygon, and the circumferential cross-section of the limiting part 310 of the mounting part is a polygon adapted to the limiting cavity 210, so that the limiting cavity 210 and the limiting part 310 cooperate to restrict the circumferential rotation of the mounting part 300.

[0053] In one specific embodiment, the circumferential cross-section of the limiting cavity 210 is rectangular, and more preferably, it is square. The circumferential cross-section of the limiting part 310 of the mounting member 300 is a rectangle that matches the limiting cavity 210, so that the limiting cavity 210 and the limiting part 310 cooperate to restrict the circumferential rotation of the mounting member 300. That is, the rotation limitation of the mounting member 300 is achieved through the rectangular structure. The structure is simple, easy to manufacture, and has a good limiting effect.

[0054] In one embodiment, the top of the limiting cavity 210 has a horizontal limiting part 212, and the middle of the horizontal limiting part 212 is provided with an avoidance hole 220, so that the horizontal limiting part 212 and the locking block 231 cooperate to restrict the axial movement of the mounting member 300.

[0055] In one embodiment, the end of the locking block 231 facing away from the clearance hole 220 is provided with a guide surface to guide the limiting portion 310 of the mounting member 300 to the limiting cavity 210 of the mounting base 200.

[0056] In one embodiment, the end of the locking block 231 near the clearance hole 220 is provided with an abutment surface, which is parallel to the horizontal limiting part 212 of the limiting cavity 210 and flush with the bottom surface of the limiting cavity 210. This allows the limiting part 310 of the mounting member 300 to be completely restricted within the limiting cavity 210 of the mounting base 200, ensuring the reliability of limiting the circumferential rotation of the mounting member 300.

[0057] In one embodiment, the mounting member 300 is a metal part, and a support part 320 is provided between the limiting part 310 and the connecting part 330. The support part 320 can pass through the clearance hole 220 of the mounting base 200, and the top surface of the support part 320 protrudes from the clearance hole 220 to contact and support the copper busbar. This method uses the metal support part 320 to contact and support the copper busbar, and cooperates with the locking member to clamp the copper busbar, thus avoiding the plastic mounting base 200 from directly supporting and clamping the copper busbar. This prevents the surface of the mounting base 200 from being cracked and damaged, thereby ensuring the reliability of the copper busbar installation and extending the service life of the injection molded housing.

[0058] In one embodiment, a buffer washer 221 is provided around the clearance hole 220 in the circumferential direction of the mounting base 200. The buffer washer 221 is integrally injection molded with the mounting base 200, and the top surface of the buffer washer 221 is flush with the top surface of the support part 320, thereby increasing the support area of ​​the copper busbar and improving the installation stability of the copper busbar. At the same time, the buffer washer 221 can enhance the strength of this part of the mounting base 200 and prevent this part from being crushed.

[0059] Example 2:

[0060] This application also provides a battery pack circuit breaker unit, including the injection-molded housing of embodiment 1. The mounting component 300 and the mounting base 200 are engaged via a snap-fit ​​arm 230 and a snap-fit ​​block 231, improving the ease of assembly and thus enhancing the ease of assembling the copper busbar on the outside of the battery pack circuit breaker unit. Furthermore, the limiting cavity 210 of the mounting base 200 restricts the circumferential movement of the mounting component 300, i.e., restricts the rotation of the mounting component 300. This prevents the mounting component 300 from rotating during tightening operations, facilitating the tightening operation of the locking component and the mounting component 300, further improving the ease of copper busbar assembly.

[0061] The battery pack circuit breaker unit contains devices such as relays, resistors, fuses, or shunts. These internal devices are connected to external units via cables passing through the harness outlet 110 on the housing. Typically, multiple cables converge at the harness plug 120, which is fixed to the harness outlet 110 with bolts. However, this operation is inconvenient due to the limited space at the harness outlet 110 and the small size of the harness plug itself.

[0062] Therefore, in one embodiment, the injection-molded housing is provided with a wire harness outlet 110 communicating with the outside, and a wire harness plug 120 is provided at the wire harness outlet 110. A plug-in structure and a locking structure are provided between the wire harness outlet 110 and the wire harness plug 120. The wire harness plug 120 is fixed to the wire harness outlet 110 through the plug-in structure and the locking structure, thereby improving the ease of assembly and reliability of the injection-molded housing of the wire harness plug 120 and the battery pack circuit breaker unit.

[0063] In one embodiment, the plug-in structure includes a boss 111 disposed at the wire harness outlet 110 and a groove disposed at the wire harness plug 120. Two bosses 111 and two grooves are symmetrically disposed on both sides along the plug-in direction. The cross sections of the bosses 111 and the grooves perpendicular to the plug-in direction are adapted L-shaped, and the two are cross-clamped when plugged in, thereby realizing the connection between the wire harness plug 120 and the injection molded housing, and realizing the restriction of the wire harness plug 120 in the vertical direction and the horizontal left and right direction.

[0064] A first blocking part 121 is provided at one end of the groove, and the blocking part is used to abut against one end of the boss 111.

[0065] The locking structure includes an elastic arm 112 disposed at the wire harness outlet 110 and a second blocking part 122 disposed at the wire harness plug 120. The second blocking part 122 is disposed away from the first blocking part 121, and the end of the elastic arm 112 can abut against the second blocking part 122 and cooperate with the first blocking part 121 to restrict the wire harness plug 120 from moving in the insertion direction, that is, to restrict the wire harness plug 120 in the horizontal front-back direction.

[0066] In one embodiment, the end of the elastic arm 112 is provided with a guide surface, which facilitates the connection between the elastic arm 112 and the second blocking part 122 when the wire harness plug 120 is assembled.

[0067] 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. An injection-molded housing, characterized in that, It includes a housing body and a fixing assembly for fixing copper busbars, the fixing assembly including a mounting base, a mounting element, and a locking element; The mounting base is integrally injection molded with the outer wall of the shell body. A limiting cavity is formed below the mounting base. A clearance groove is symmetrically arranged in the circumferential direction of the limiting cavity. A snap-fit ​​arm is arranged in the clearance groove. A snap-fit ​​block is arranged at the end of the snap-fit ​​arm. A clearance hole is also provided at the top of the limiting cavity. The mounting component includes a limiting part and a connecting part located on the limiting part. The limiting part is adapted to the limiting cavity, and the limiting part can extend into the limiting cavity through the locking block and allow the connecting part to pass through the clearance hole. The connecting part is used to insert into the mounting hole of the copper busbar, and the locking member is used to be threadedly connected to the connecting part, thereby fixing the copper busbar between the limiting part and the locking member; and, The limiting cavity and the locking block cooperate to restrict the circumferential and axial movement of the limiting part located within the limiting cavity.

2. The injection-molded housing according to claim 1, characterized in that, The circumferential cross-section of the limiting cavity is rectangular, and the circumferential cross-section of the limiting part of the mounting component is a rectangle adapted to the limiting cavity, so that the limiting cavity and the limiting part cooperate to restrict the circumferential rotation of the mounting component; The top of the limiting cavity has a horizontal limiting part, and the middle of the horizontal limiting part is provided with the clearance hole, so that the horizontal limiting part and the locking block cooperate to restrict the axial movement of the mounting part.

3. The injection-molded housing according to claim 1, characterized in that, The mounting component is a metal component, and a support component is provided between the limiting part and the connecting part. The support component can pass through the clearance hole of the mounting base, and the top surface of the support component protrudes from the clearance hole to contact and support the copper busbar.

4. The injection-molded housing according to claim 3, characterized in that, The mounting base is provided with a buffer washer around the clearance hole in the circumferential direction. The buffer washer is integrally injection molded with the mounting base, and the top surface of the buffer washer is flush with the top surface of the support.

5. The injection-molded housing according to claim 1, characterized in that, The end of the card block opposite to the clearance hole is provided with a guide surface to guide the limiting part of the mounting member to the limiting cavity of the mounting base.

6. The injection-molded housing according to claim 2, characterized in that, The end of the card block near the clearance hole is provided with an abutment surface, which is parallel to the horizontal limiting part of the limiting cavity and flush with the bottom surface of the limiting cavity.

7. A battery pack circuit breaker unit, characterized in that, Includes the injection-molded housing as described in any one of claims 1-6.

8. The battery pack circuit breaker unit according to claim 7, characterized in that, The injection-molded housing is provided with a wire harness outlet communicating with the outside. A wire harness plug is provided at the wire harness outlet, and a plug-in structure and a locking structure are provided between the wire harness outlet and the wire harness plug. The wire harness plug is fixed to the wire harness outlet by the plug-in structure and the locking structure.

9. The battery pack circuit breaker unit according to claim 8, characterized in that, The plug-in structure includes a boss at the outlet of the wire harness and a groove at the plug of the wire harness. Two bosses and two grooves are symmetrically arranged on both sides along the plug-in direction. The cross sections of the boss and the groove perpendicular to the plug-in direction are adapted L-shaped, and they are interlocked in a cross-clamping manner when plugged in. A first blocking part is provided at one end of the groove, and the blocking part is used to abut against one end of the boss; The locking structure includes an elastic arm disposed at the outlet of the wire harness and a second blocking portion disposed at the plug of the wire harness. The second blocking portion is disposed away from the first blocking portion, and the end of the elastic arm can abut against the second blocking portion and cooperate with the first blocking portion to restrict the movement of the plug of the wire harness along the insertion direction.

10. The battery pack circuit breaker unit according to claim 9, characterized in that, The end of the elastic arm is provided with a guide surface.

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