Battery disconnect unit housing and battery pack

Abstract

This application relates to the field of battery technology and discloses a battery disconnection unit housing and a battery pack. The battery disconnection unit housing includes a base, a top cover, a first frame, a second frame, and a latching component. A first protrusion and a second protrusion are spaced apart along a first direction on a movable arm, forming a latching space between them. At least partially, the first and second frames are latched within this space, preventing them from moving away from each other along the first direction. This application utilizes the movable arm and the cooperation of the first and second protrusions to limit the movement of the first and second frames. During the operation of removing the top cover to open the housing, by moving the movable arm towards the main body, the second protrusion on the movable arm is released from its limiting engagement with the second frame. Subsequently, the latching component moves along the first direction to separate from the first and second frames, reducing the space required for operation and improving the efficiency of opening the top cover.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery disconnection unit housing and battery pack. Background Technology

[0002] As a key component in the power battery system of new energy vehicles, the battery disconnect unit (BDU) includes a housing, which consists of a base and a top cover. To facilitate opening the top cover for maintenance or repair, the base and top cover are often connected by a snap-fit ​​structure.

[0003] In related technologies, the snap-fit ​​connection structure includes a hook on the top cover and a corresponding latch on the base. To open the top cover, the hook needs to be flipped outwards and then moved upwards. However, in the actual installation environment of the battery disconnect unit, it is usually surrounded by other electrical components, wiring harnesses, or structural parts, making it difficult to flip the hook outwards and affecting the efficiency of opening the top cover. Utility Model Content

[0004] In view of this, this application provides a housing and battery pack for a battery disconnection unit to solve or improve the problem that the snap-fit ​​connection structure on the housing of the battery disconnection unit is inconvenient to open.

[0005] In a first aspect, this application provides a housing for a battery disconnection unit, including a base, a top cover, a first frame, a second frame, and a fastener. The first and second frames have corresponding through holes, one of which is disposed on the base, and the other on the top cover. The fastener is sequentially inserted into the through holes of the first and second frames along a first direction. The fastener includes a main body and at least one movable arm disposed on the main body, the movable arm being movable along a second direction. The movable arm has a first protrusion and a second protrusion spaced apart along the first direction, forming a locking space between the first and second protrusions. The first and second frames are at least partially locked within the locking space to restrict the first and second frames from moving away from each other along the first direction.

[0006] Beneficial effects: This application sets up a latching component that passes sequentially through the first frame and the second frame along a first direction, using a movable arm and a first and second protrusion to limit the movement of the first and second frames. During the operation of removing the top cover to open the box, by moving the movable arm towards the main body, the second protrusion on the movable arm is released from its limiting engagement with the second frame. Subsequently, the latching component moves along the first direction to separate from the first and second frames, reducing the space required for operation and improving the efficiency of opening the top cover.

[0007] In one alternative embodiment, the movable arm is elastically connected to the body; or, the movable arm is elastic.

[0008] Beneficial effects: By setting the movable arm to be elastically connected to the main body, or by making the movable arm itself an elastic structure, when disassembling the fastener, only pressure needs to be applied to the pressing area of ​​the movable arm in the direction of the main body to cause the movable arm to shift relative to the main body, thereby releasing the second protrusion from the limiting engagement with the second frame. This simplifies the operation steps and reduces the requirements for operating space. Furthermore, when installing the fastener, when the second protrusion on the movable arm contacts the inner wall of the through hole in the second frame, as the fastener continues to be inserted in the first direction, the movable arm will be automatically pressed towards the main body. After the second protrusion reaches the preset position, the movable arm can automatically unfold under the action of elastic restoring force, thereby achieving automatic locking of the fastener with the first and second frames, facilitating the connection of the top cover and the base.

[0009] In one alternative embodiment, the first frame includes two opposing and spaced-apart first plates, the two first plates being disposed on the upper cover, at least a portion of the movable arm being disposed between the two first plates, and a second plate being connected between the two first plates; the first plates and the movable arm are mutually limitingly engaged along a second direction, and the second plate and the movable arm are mutually limitingly engaged along a third direction, the second direction intersecting the third direction.

[0010] Beneficial effects: The two opposing and spaced-apart first plates provide a guide channel for the fasteners. When the fasteners are inserted, the two first plates work together to correct their position and guide them into the first direction, effectively preventing misalignment and assembly difficulties. Simultaneously, the two first plates limit the movable arm in the second direction, effectively preventing relative displacement between the first and second frames, and consequently, preventing relative displacement between the base and the top cover. The second plate connects the two first plates, and together with the top cover, limits the fastener 3 in the third direction, effectively preventing relative displacement between the first and second frames, and consequently, preventing relative displacement between the base and the top cover.

[0011] In one alternative embodiment, the second frame includes two opposing and spaced-apart third plates, the two third plates being disposed on the base, and a fourth plate connecting the two third plates; the third plates are engaged with the movable arm along the first direction, and the fourth plate is engaged with the movable arm along the third direction.

[0012] Beneficial effect: The two third plates cooperate to limit the movable arm along the first direction, effectively preventing the first frame and the second frame from moving away from each other along the first direction. A fourth plate is connected between the two third plates. The fourth plate cooperates with the movable arm in a third direction to limit the movement, effectively preventing the fastener and the top cover from shifting in the third direction. This setting, in conjunction with the first frame, achieves the constraint of the fastener in the second and third directions.

[0013] In one alternative embodiment, a limiting groove is formed on the surface of the third plate facing the movable arm, the limiting groove having a first contact surface close to the first frame, at least partially of the second protrusion extending into the limiting groove, and the end face of the second protrusion facing the first frame contacting the first contact surface.

[0014] Beneficial effects: A limiting groove is provided on the third plate, which offers an engagement position for the second protrusion. When the second protrusion extends into the limiting groove and abuts against the first contact surface, a hook-like mechanical interlock is formed between the movable arm and the third plate, effectively limiting the movement of the latch 3 along the first direction. Simultaneously, the second protrusion, accommodated within the limiting groove, is less likely to disengage from the limiting groove under unexpected conditions such as vibration, thanks to the elastic restoring force of the movable arm, thus ensuring the connection stability between the top cover and the box body.

[0015] In one alternative embodiment, the third plate has opposing first and second sides, the first side facing the movable arm, and the limiting groove extending through the first side to the second side of the third plate.

[0016] Beneficial effects: By setting a limiting groove that penetrates the third plate, the depth of the limiting groove can be extended, allowing more of the second protrusion to be accommodated within it. This effectively prevents the second protrusion from detaching from the limiting groove under unexpected operating conditions such as vibration. Furthermore, when disassembling the fastener, the operator can observe the limiting groove from the side of the third plate away from the moving arm while driving the movable arm towards the main body. This allows them to assess the separation status of the second protrusion from the limiting groove, preventing excessive pressure on the movable arm's displacement and damage to the fastener, thereby extending its service life.

[0017] In one alternative embodiment, the first protrusion is provided with an extension arm that extends in a direction away from the first frame.

[0018] Beneficial effects: By setting up an extension arm, it is convenient for the operator to drive the extension arm to move the movable arm toward the main body, which facilitates the fastener to detach from the first frame and the second frame along the first direction, and also facilitates the fastener to pass through the first frame and the second frame along the first direction, thereby facilitating the separation and connection of the top cover and the base.

[0019] In one optional embodiment, the main body is provided with movable arms on both sides along the second direction, and the two movable arms are respectively provided corresponding to the two first plates.

[0020] Beneficial effects: By setting two movable arms corresponding to the two first plates respectively, the locking force along the first direction can be evenly distributed to the two second protrusions when the buckle is locked, which effectively avoids tilting or warping between the top cover and the base caused by unilateral force and improves connection stability.

[0021] In one alternative embodiment, the surfaces of the first frame and the second frame that are close to each other are in contact; and / or, the movable arm has a first end and a second end opposite to each other along the first direction, the first end of the movable arm being connected to the main body, and the second end of the movable arm being away from the main body along the second direction, so that the movable arm is inclined.

[0022] Beneficial effects: When the top cover and base are connected, the end faces of the first and second frames are in direct contact, which reduces the size of the fastener in the first direction, making the overall fastening connection structure formed by the first frame, the second frame, and the fastener compact. The inclined movable arm makes the two ends of the fastener have different dimensions along the first direction, making it easier for the smaller end of the fastener to pass through the through holes of the first and second frames, thereby reducing the assembly difficulty of the fastener and improving the assembly error tolerance.

[0023] Secondly, this application also provides a battery pack, including a battery disconnection unit, wherein the battery disconnection unit is provided with a housing of the battery disconnection unit as described in any one of the above-mentioned applications.

[0024] Beneficial effects: The battery pack contains a housing with the aforementioned battery disconnect unit. This housing is sequentially mounted on the first frame and the second frame along a first direction using fasteners. During the operation of removing the top cover to open the housing, the movable arm is moved towards the main body, causing the second protrusion on the movable arm to disengage from the second frame's limiting engagement. Subsequently, the fasteners are moved along the first direction to separate from the first and second frames, reducing the space required for operation, improving the efficiency of opening the top cover, and facilitating the maintenance of the battery disconnect unit in the battery pack. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the connection relationship between the base and the top cover in an embodiment of this application; Figure 2 This is a schematic diagram showing the connection relationship between the first frame and the second frame and the fastener in an embodiment of this application; Figure 3 This is a schematic diagram showing the disassembled structure of the first frame, the second frame, and the fasteners in an embodiment of this application. Figure 4 for Figure 2 Top view; Figure 5 for Figure 4 Sectional view of AA; Figure 6 This is a schematic diagram illustrating the connection relationship between the extension arm and the fastener in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures: Z, first direction; X, second direction; Y, third direction; 100, base; 200, top cover; 300, through hole; 400, snap-fit ​​space; 1. First frame; 101. First board; 102. Second board; 2. Second frame; 201. Third board; 202. Fourth board; 3. Fasteners; 301. Main body; 302. Movable arm; 303. First protrusion; 304. Second protrusion; 4. Limiting groove; 401. First contact surface; 5. Extension arm. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The battery disconnect unit (BDU), a key component in the power battery system of new energy vehicles, consists of a housing and electrical components (such as relays and fuses) housed within it. The housing includes a base 100 and a top cover 200. The base 100 typically houses the aforementioned electrical components, while the top cover 200 seals the base 100. To facilitate opening the top cover 200 for maintenance or repair, the base 100 and the top cover 200 are often connected using a snap-fit ​​structure.

[0030] In related technologies, the snap-fit ​​connection structure includes a hook on the top cover 200 and a corresponding latch on the base 100. To open the top cover 200, the hook must first be flipped outwards and then moved upwards. However, in the actual installation environment of the battery disconnect unit, the surrounding area is usually filled with other electrical components, wiring harnesses, or structural parts, making it difficult to flip the hook outwards and affecting the opening efficiency of the top cover 200. Furthermore, the top cover 200 is usually located above the base 100 in the height direction, and multiple snap-fit ​​connection structures are provided on a single unit. After separating one hook from the latch, when disassembling other hooks, the hooks are prone to fall back down and re-engage with the latches under gravity, further complicating and cumbersome the disassembly process of the top cover 200 and the base 100. In addition, it is difficult for operators to control the force when manually prying the hooks, easily leading to breakage or damage.

[0031] The following is combined with Figures 1 to 6 This describes an embodiment of the present application.

[0032] According to embodiments of this application, in a first aspect, this application provides a housing for a battery disconnection unit, such as... Figure 1 As shown, the box mainly includes a base 100, a top cover 200, a first frame 1, a second frame 2, and a fastener 3. Both the first frame 1 and the second frame 2 are provided with corresponding through holes 300. One of the first frame 1 and the second frame 2 is located in the base 100, and the other is located in the top cover 200.

[0033] Specifically, the first frame 1 is fixed to the upper cover 200, and the second frame 2 is fixed to the base 100. It can be understood that in some other embodiments not shown, the positions of the first frame 1 and the second frame 2 are interchanged, that is, the first frame 1 is fixed to the base 100, and the second frame 2 is fixed to the upper cover 200. The following description uses the example of the first frame 1 being fixed to the upper cover 200 and the second frame 2 being fixed to the base 100 as an example.

[0034] like Figure 2 , Figure 3 As shown, the fastener 3 is sequentially inserted into the through hole 300 of the first frame 1 and the through hole 300 of the second frame 2 along the first direction Z. The fastener 3 includes a main body 301 and at least one movable arm 302 disposed on the main body 301. The movable arm 302 is movable along the second direction X. The movable arm 302 is provided with a first protrusion 303 and a second protrusion 304 at intervals along the first direction Z. A snap-fit ​​space 400 is formed between the first protrusion 303 and the second protrusion 304. The first frame 1 and the second frame 2 are at least partially snapped into the snap-fit ​​space 400 to restrict the first frame 1 and the second frame 2 from moving away from each other along the first direction Z.

[0035] First, it should be noted that, as Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, the first direction Z is the height direction of the box, that is, the thickness direction of the box; the second direction X is the length direction of the box; and the third direction Y is the width direction of the box. Of course, those skilled in the art can adjust the specific directions referred to by the first direction Z, the second direction X, and the third direction Y according to actual needs.

[0036] In this embodiment, as Figure 2 , Figure 3 As shown, the fastener 3 includes a main body 301 and a movable arm 302 connected to the main body 301. The movable arm 302 is configured to move relative to the main body 301 in the second direction X. That is, when the movable arm 302 is subjected to external pressure, it can deflect toward the main body 301 so that the fastener 3 can pass through the through hole 300 of the first frame 1 in the first direction Z and extend to the through hole 300 of the second frame 2. When the external pressure is released, the movable arm 302 can deflect toward the direction away from the main body 301 so as to limit the engagement with the second frame 2 in the first direction Z.

[0037] Specifically, a first protrusion 303 and a second protrusion 304 are provided at intervals along the first direction Z on the movable arm 302. The interval between the first protrusion 303 and the second protrusion 304 in the first direction Z forms a snap-fit ​​space 400. When the snap fastener 3 is fully inserted and locked with the first frame 1 and the second frame 2, at least a portion of the top surface of the first frame 1 along the first direction Z and the second frame 2 along the first direction Z are accommodated and snapped in the snap-fit ​​space 400. By clamping the first protrusion 303 and the second protrusion 304 along the first direction Z, the first frame 1 and the second frame 2 are effectively restricted from moving away from each other along the first direction Z.

[0038] With this configuration, the latching element 3 is sequentially inserted into the first frame 1 and the second frame 2 along the first direction Z. The movable arm 302, the first protrusion 303, and the second protrusion 304 cooperate to limit the movement of the first frame 1 and the second frame 2. During the operation of removing the top cover 200 to open the box, the movable arm 302 is moved towards the main body 301, causing the second protrusion 304 on the movable arm 302 to release its limiting cooperation with the second frame 2. Subsequently, the latching element 3 is moved along the first direction Z to separate from the first frame 1 and the second frame 2, reducing the operating space required to remove the latching element 3 and improving the opening efficiency of the top cover 200.

[0039] Optionally, when the fastener 3 is fully inserted and locked to the first frame 1 and the second frame 2, the top surface of the first frame 1 along the first direction Z and the bottom surface of the second frame 2 along the first direction Z can be accommodated and engaged within the engagement space 400. This can also be understood as the first frame 1 and the second frame 2 being located between the first protrusion 303 and the second protrusion 304 along the first direction Z. Alternatively, when the fastener 3 is fully inserted and locked to the first frame 1 and the second frame 2, the top surface of the first frame 1 along the first direction Z and a portion of the second frame 2 along the first direction Z can be accommodated and engaged within the engagement space 400. This involves providing a limiting groove 4 on the second frame 2, which also allows for effective locking of the first frame 1 and the second frame 2 using the fastener 3.

[0040] Understandably, when the movable arm 302 is under external pressure and deflects toward the main body 301, considering that the deflection path of the second protrusion 304 is easily interfered with by the second frame 2, the second protrusion 304 can be set as an elastic structure with a certain strength, so that the second protrusion 304 can produce a small deformation during the process of releasing the limiting relationship with the second frame 2 along the first direction Z, which facilitates the movement of the second protrusion 304 relative to the second frame 2 and releases the limiting relationship with the second frame 2.

[0041] It is understood that the box and the corresponding first frame 1, second frame 2 and fastener 3 proposed in this embodiment can be applied not only to the use scenario of battery circuit breaker unit, but also to other use scenarios that require the use of the box to realize the storage function.

[0042] In one embodiment, the movable arm 302 is elastically connected to the body 301; or, the movable arm 302 is elastic.

[0043] In this embodiment, as Figure 2 , Figure 3 As shown, the elastic connection between the movable arm 302 and the main body 301 refers to the connection between the two through a component or structure with elastic deformation capability. This allows the movable arm to generate a certain elastic displacement or rotation relative to the main body 301 when subjected to external force, and to return to its initial position or remain in a predetermined position after the external force disappears, relying on elastic restoring force. Specifically, a torsion spring can be provided between the movable arm 302 and the main body 301. The movable arm 302 can be connected to the main body 301 through the torsion spring, thereby enabling the movable arm 302 to deflect closer to or away from the main body 301. The movable arm 302 itself can be a rigid structure. Alternatively, the movable arm 302 can be made of an elastic material. As an elastic body, the connection between the movable arm 302 and the main body 301 can be a fixed connection, allowing the movable arm 302 to achieve deflection movement relative to the main body 301 by its own elastic deformation.

[0044] With this configuration, when disassembling the buckle 3, only pressure needs to be applied to the pressing area of ​​the movable arm 302 in the direction of the main body 301 to cause the movable arm 302 to shift relative to the main body 301, thereby causing the movable arm 302 to drive the second protrusion 304 to move synchronously, so that the second protrusion 304 and the second frame 2 are released from the limiting engagement, simplifying the operation steps and reducing the requirements for operating space.

[0045] Furthermore, when installing the buckle 3, as the buckle 3 is inserted into the first frame 1 along the first direction Z, pressure is applied to the pressing area of ​​the movable arm 302 in the direction of the main body 301, causing the overall size of the buckle 3 along the second direction X to decrease, making it easier for the buckle 3 to pass through the first frame 1 and the second frame 2. When the second protrusion 304 on the movable arm 302 contacts the inner wall of the through hole 300 of the second frame 2, as the buckle 3 continues to be inserted along the first direction Z, the movable arm 302 will be automatically pressed towards the main body 301. After the second protrusion 304 reaches the preset position, the movable arm 302 can automatically unfold under the action of elastic restoring force, thereby achieving automatic locking of the buckle 3 with the first frame 1 and the second frame 2, facilitating the connection between the upper cover 200 and the base 100.

[0046] In one embodiment, the first frame 1 includes two opposing and spaced-apart first plates 101, which are disposed on the upper cover 200. At least a portion of the movable arm 302 is disposed between the two first plates 101, and a second plate 102 is connected between the two first plates 101. The first plate 101 and the movable arm 302 are mutually limited and engaged along a second direction X, and the second plate 102 and the movable arm 302 are mutually limited and engaged along a third direction Y. The second direction X and the third direction Y intersect.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 As shown, two first plates 101 are disposed on the upper cover 200, and the first plates 101 can be fixedly connected to the upper cover 200 by means of integral molding, welding or bolts. The two opposing and spaced first plates 101 can provide a guide channel for the fastener 3. When the fastener 3 is inserted, the two first plates 101 cooperate to correct the position of the fastener 3 and guide the fastener 3 to be inserted along the first direction Z, effectively preventing the fastener 3 from being misaligned and causing assembly difficulties. At the same time, the two first plates 101 limit the movable arm 302 in the second direction X, effectively preventing the first frame 1 and the second frame 2 from having relative displacement in the second direction X, thereby preventing the base 100 and the upper cover 200 from having relative displacement in the second direction X.

[0048] A second plate 102 is fixedly connected between the two first plates 101, so that the two first plates 101 and the second plate 102 together form a roughly U-shaped or door-shaped frame structure. In this way, the second plate 102 and the top cover 200 cooperate to limit the fastener 3 in the third direction Y, effectively preventing the first frame 1 and the second frame 2 from relative displacement in the third direction Y, and thus preventing the base 100 and the top cover 200 from relative displacement in the third direction Y.

[0049] In one embodiment, the second frame 2 includes two opposing and spaced third plates 201, which are disposed on the base 100, and a fourth plate 202 is connected between the two third plates 201; the third plates 201 are limited to the movable arm 302 in the first direction Z, and the fourth plate 202 is limited to the movable arm 302 in the third direction Y.

[0050] In this embodiment, as Figure 1 , Figure 2 , Figure 3 As shown, two third plates 201 are mounted on the base 100, and the third plates 201 can be fixedly connected to the base 100 by means of integral molding, welding, or bolts. The two third plates 201 cooperate to limit the movable arm 302 along the first direction Z, effectively preventing the first frame 1 and the second frame 2 from moving away from each other along the first direction Z. Furthermore, when the fastener 3 is inserted along the first direction Z, the two second plates 102 cooperate to further correct the position of the fastener 3, guiding the fastener 3 to be inserted along the first direction Z, effectively preventing misalignment of the fastener 3 that would cause assembly difficulties. In addition, the two third plates 201 cooperate to limit the movable arm 302 along the second direction X, effectively preventing the first frame 1 and the second frame 2 from undergoing relative displacement in the second direction X.

[0051] A fourth plate 202 is fixedly connected between the two third plates 201. The fourth plate 202 and the movable arm 302 are mutually constrained in the third direction Y, effectively preventing the buckle 3 and the upper cover 200 from displacing relative to the base 100 in the third direction Y. With this configuration, the buckle 3 cooperates with the first frame 1 and the second frame 2, which can constrain the buckle 3 in the second direction X and the third direction Y in the horizontal plane, improving the connection effect between the upper cover 200 and the base 100.

[0052] In one embodiment, a limiting groove 4 is formed on the surface of the third plate 201 facing the movable arm 302. The limiting groove 4 has a first contact surface 401 close to the first frame 1. At least a portion of the second protrusion 304 extends into the limiting groove 4, and the end face of the second protrusion 304 facing the first frame 1 contacts the first contact surface 401.

[0053] In this embodiment, as Figure 4 , Figure 5As shown, a limiting groove 4 is provided on the third plate 201. The limiting groove 4 provides an engaging position for the second protrusion 304. When the buckle 3 is fully inserted and in the locked state, at least a portion of the second protrusion 304 on the movable arm 302 extends into and is accommodated in the limiting groove 4. At this time, the end face of the second protrusion 304 facing the first frame 1 forms a surface contact with the first contact surface 401 in the limiting groove 4 and fits tightly, so that the movable arm 302 and the third plate 201 form a hook-type mechanical interlock, effectively restricting the buckle 3 from moving along the first direction Z. Moreover, with the second protrusion 304 accommodated in the limiting groove 4, and with the elastic restoring force of the movable arm 302, the second protrusion 304 is not easy to disengage from the limiting groove 4 under unexpected working conditions such as vibration, ensuring the connection stability of the top cover 200 and the box body.

[0054] Optionally, the second protrusion 304 is adapted to the limiting groove 4 in the third direction Y. That is, when the second protrusion 304 is inserted into the limiting groove 4, the second protrusion 304 is not only constrained by the limiting groove 4 in the first direction Z, but also by the limiting groove 4 in the third direction Y. In this way, when the fastener 3 is locked, it can be jointly constrained in the third direction Y by the upper cover 200, the base 100, the second plate 102, the third plate 201, and the fourth plate 202, further preventing the fastener 3 from moving in the third direction Y under unexpected working conditions, and improving the connection effect between the upper cover 200 and the base 100.

[0055] Understandably, during the assembly of the buckle 3, when the second protrusion 304 on the movable arm 302 corresponds to the limiting groove 4, the movable arm 302 moves towards the third plate 201 under the action of elasticity. The movable arm 302 collides with the third plate 201, so that the operator can hear the collision sound and feel the change in feel more clearly, thereby providing clear feedback for the second protrusion 304 to be assembled in place, and further facilitating the assembly of the buckle 3.

[0056] In one embodiment, the third plate 201 has a first side and a second side opposite to each other, the first side facing the movable arm 302, and the limiting groove 4 passing through the first side to the second side of the third plate 201.

[0057] In this embodiment, as Figure 5As shown, by setting a limiting groove 4 that penetrates the third plate 201, the depth of the limiting groove 4 can be extended, allowing more of the second protrusion 304 to be accommodated within the limiting groove 4. This effectively prevents the second protrusion 304 from detaching from the limiting groove 4 under unexpected working conditions such as vibration. Furthermore, when disassembling the fastener 3, the operator can observe the limiting groove 4 from the side of the third plate 201 away from the movable arm 302 while driving the movable arm 302 towards the main body 301. This allows the operator to determine the separation status of the second protrusion 304 from the limiting groove 4, preventing excessive pressure on the movable arm 302 and its displacement towards the main body 301, which could damage the fastener 3 and thus extend its service life.

[0058] In one embodiment, an extension arm 5 is provided on the first protrusion 303, and the extension arm 5 extends in a direction away from the first frame 1.

[0059] In this embodiment, as Figure 6 As shown, the extension arm 5 is fixed to the first protrusion 303. The extension arm 5 can extend along the first direction Z, and the extension direction of the extension arm 5 is away from the first protrusion 303. In this way, by setting the extension arm 5, it is convenient for the operator to drive the extension arm 5 to move the first protrusion 303, thereby driving the movable arm 302 to move towards the main body 301. This facilitates the buckle 3 to disengage from the first frame 1 and the second frame 2 along the first direction Z, and also facilitates the buckle 3 to pass through the first frame 1 and the second frame 2 along the first direction Z, thereby facilitating the separation and connection of the upper cover 200 and the base 100. Moreover, the extension arm 5 is arranged on the first protrusion 303. When there are two movable arms 302, the distance between the two extension arms 5 can be set to be relatively large, so that the operator only needs to drive the two extension arms 5 to make a small displacement along the second direction X to drive the movable arm 302 to move along the second direction X and drive the second protrusion 304 to move.

[0060] Of course, in addition to the above-mentioned arrangement of fixing the extension arm 5 to the first protrusion 303, the extension arm 5 can also be directly fixed to the movable arm 302, with the extension arm 5 also extending in a direction away from the first frame 1. In this arrangement, it is also convenient for the operator to drive the extension arm 5 to move the movable arm 302 towards the main body 301, facilitating the disengagement of the latching member 3 from the first frame 1 and the second frame 2 along the first direction Z, and facilitating the insertion of the latching member 3 through the first frame 1 and the second frame 2 along the first direction Z, thereby facilitating the separation and connection of the upper cover 200 and the base 100.

[0061] In one embodiment, movable arms 302 are respectively provided on both sides of the main body 301, and the two movable arms 302 are respectively provided corresponding to the two first plates 101.

[0062] In this embodiment, as Figure 2 , Figure 3 , Figure 5As shown, two movable arms 302 are fixed to both sides of the main body 301 along the second direction X. The main body 301 can be a connecting block or a connecting plate, etc. The main body 301 serves as a base to support the two movable arms 302. Under external pressure, the two movable arms 302 can move closer to each other along the second direction X. When the external pressure is released, the two movable arms 302 can elastically return to their original position and move away from each other. By setting the two movable arms 302 to correspond to the two first plates 101 respectively, the locking force along the first direction Z of the buckle 3 can be distributed more evenly to the two second protrusions 304 when locking, effectively avoiding tilting or warping between the top cover 200 and the base 100 caused by unilateral force, thus improving the connection stability.

[0063] In one alternative embodiment, the surfaces of the first frame 1 and the second frame 2 that are close to each other are in contact; and / or, the movable arm 302 has a first end and a second end opposite to each other along the first direction Z, the first end of the movable arm 302 is connected to the main body 301, and the second end of the movable arm 302 is away from the main body 301 along the second direction X, so that the movable arm 302 is inclined.

[0064] In this embodiment, as Figure 4 As shown, when the upper cover 200 and the base 100 are connected, the end faces of the first frame 1 and the second frame 2 are in direct contact, which can reduce the size of the fastener 3 in the first direction Z, making the overall fastening connection structure formed by the first frame 1, the second frame 2 and the fastener 3 more compact. The inclined movable arm 302 makes the two ends of the fastener 3 have different sizes along the first direction Z, which makes it easier for the smaller end of the fastener 3 to pass through the through hole 300 of the first frame 1 and the through hole 300 of the second frame 2, thereby reducing the assembly difficulty of the fastener 3 and improving the assembly error tolerance.

[0065] Secondly, this application also provides a battery pack, including a battery disconnection unit, wherein the battery disconnection unit is provided with the aforementioned battery disconnection unit housing.

[0066] In this embodiment, the battery pack contains a housing with the aforementioned battery disconnect unit. The housing is sequentially mounted on the first frame 1 and the second frame 2 along the first direction Z by a fastener 3. During the operation of removing the top cover 200 to open the housing, the movable arm 302 is moved towards the main body 301, causing the second protrusion 304 on the movable arm 302 to release its limiting engagement with the second frame 2. Subsequently, the fastener 3 is moved along the first direction Z to separate from the first frame 1 and the second frame 2, reducing the space required for operation, improving the opening efficiency of the top cover 200, and facilitating the maintenance of the battery disconnect unit in the battery pack.

[0067] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A case of a battery disconnect unit, characterized by, include: Base (100) and top cover (200); The first frame (1) and the second frame (2) are provided with corresponding through holes (300). One of the first frame (1) and the second frame (2) is disposed on the base (100) and the other is disposed on the top cover (200). The fastener (3) is sequentially inserted into the through hole (300) of the first frame (1) and the through hole (300) of the second frame (2) along the first direction (Z). The fastener (3) includes a main body (301) and at least one movable arm (302) disposed on the main body (301). The movable arm (302) is capable of moving along the second direction (X). The movable arm (302) is provided with a first protrusion (303) and a second protrusion (304) spaced apart along the first direction (Z). A snap-fit ​​space (400) is formed between the first protrusion (303) and the second protrusion (304). The first frame (1) and the second frame (2) are at least partially snapped in the snap-fit ​​space (400) to restrict the first frame (1) and the second frame (2) from moving away from each other along the first direction (Z).

2. The battery disconnect unit's box according to claim 1, characterized in that, The movable arm (302) is elastically connected to the main body (301); Alternatively, the movable arm (302) may be elastic.

3. The battery disconnect unit's box according to claim 1, characterized in that, The first frame (1) includes two opposing and spaced-apart first plates (101), the two first plates (101) are disposed on the upper cover (200), at least a portion of the movable arm (302) is disposed between the two first plates (101), and a second plate (102) is connected between the two first plates (101). The first plate (101) and the movable arm (302) are limited and engaged along the second direction (X), and the second plate (102) and the movable arm (302) are limited and engaged along the third direction (Y). The second direction (X) and the third direction (Y) intersect.

4. The battery disconnect unit's box according to claim 3, characterized in that, The second frame (2) includes two opposing and spaced third plates (201), the two third plates (201) are disposed on the base (100), and a fourth plate (202) is connected between the two third plates (201). The third plate (201) and the movable arm (302) are limited and engaged along the first direction (Z), and the fourth plate (202) and the movable arm (302) are limited and engaged along the third direction (Y).

5. The battery disconnect unit's box according to claim 4, characterized in that, The third plate (201) has a limiting groove (4) on its surface facing the movable arm (302). The limiting groove (4) has a first contact surface (401) close to the first frame (1). At least a portion of the second protrusion (304) extends into the limiting groove (4), and the end face of the second protrusion (304) facing the first frame (1) contacts the first contact surface (401).

6. The battery disconnect unit's box of claim 5, wherein, The third plate (201) has a first side and a second side opposite to each other, the first side facing the movable arm (302), and the limiting groove (4) extends through the first side to the second side of the third plate (201).

7. The battery disconnect unit's box according to any of claims 1-6, characterized in that, An extension arm (5) is provided on the first protrusion (303), and the extension arm (5) extends in a direction away from the first frame (1).

8. The housing of the battery disconnection unit according to claim 3, characterized in that, The main body (301) is provided with movable arms (302) on both sides along the second direction (X), and the two movable arms (302) are respectively provided with the two first plates (101).

9. The housing of the battery disconnection unit according to claim 3, characterized in that, The surfaces of the first frame (1) and the second frame (2) that are close to each other are in contact; And / or, the movable arm (302) has a first end and a second end opposite to each other along the first direction (Z), the first end of the movable arm (302) is connected to the body (301), and the second end of the movable arm (302) is away from the body (301) along the second direction (X), so that the movable arm (302) is inclined.

10. A battery pack, characterized in that, It includes a battery disconnect unit, wherein the battery disconnect unit is provided with a housing of the battery disconnect unit according to any one of claims 1-9.

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