Vehicle-mounted cut-off unit and battery pack

Abstract

A vehicle-mounted cut-off unit and a battery pack, which relate to the technical field of new energy vehicles. The vehicle-mounted cut-off unit comprises an upper cover (1), a housing (3), a PCB (2) arranged between the upper cover and the housing, a BDU module (5) assembled on the PCB, and blade terminals (41) configured to connect the PCB and the BDU module, wherein the BDU module comprises pins (31) used for signal lead-out; and each blade terminal comprises a horizontal section (411) and a plug-in section (412) which are perpendicular to each other, with the plug-in section passing through the PCB to form a crimp connection with the corresponding pin, and the horizontal section abutting against an upper end face of the PCB to form a fixed connection. In the present technical solution, the dimensional tolerance of the entire unit assembly is absorbed by means of the cooperation of screws and holes, the assembly is simple, internal stress can be eliminated, and the reliability is high.

Description

Vehicle-mounted cut-off unit and battery pack TECHNICAL FIELD

[0001] The utility model belongs to new energy automobile technical field, concretely relates to a vehicle-mounted cut-off unit and battery pack. BACKGROUND

[0002] The vehicle-mounted cut-off unit of new energy automobile is a key safety component, and its main function is to cut off the connection between the battery and the motor when necessary to ensure the safety of the vehicle and passengers. In order to meet the needs of new energy vehicles for high integration and high efficiency production, the design and production of vehicle-mounted cut-off units are developing towards wireless harness.

[0003] Specifically, the design idea of this new architecture mainly includes two points: one is to highly integrate the battery management system (BMS) and the battery disconnect unit (BDU); the other is to use the pins, spring contacts and customized devices of the relay to directly insert all control signals into the printed circuit board (PCB) of the BMS, so as to completely cancel the internal wire harness of the product, thereby improving the production efficiency and reliability.

[0004] However, in the actual production process, products of this new architecture form generally encounter some problems, resulting in a low yield and failing to achieve the expected production efficiency improvement. These problems mainly include:

[0005] Long tolerance chain and large cumulative tolerance: due to multiple tolerance links between the relay, the shell, the PCB and other components, the overall tolerance chain is relatively long, and the cumulative tolerance is relatively large. This may affect the precision and reliability of the product.

[0006] Connector tolerance is difficult to meet: in order to ensure safe and reliable connection in the vehicle-mounted environment (long-term vibration cycle), the connector carrying the signal needs to meet a larger tolerance. However, this is difficult to achieve in actual production or requires a higher cost.

[0007] Relay installation position deformation and uncertainty: when installing the relay, in order to ensure the reliability of the high-voltage current main signal, the fastening force of the copper bar connection will be large. This may cause deformation and increased uncertainty of the relay installation position.

[0008] Difficulty in aligning and plugging the connector during assembly: when the product design assembly tolerance cannot meet the connection requirements, it will cause difficulty in aligning and plugging the connector during assembly, thereby affecting the production efficiency. Even if it is aligned, there may be a large stress on the device pad and other positions, thereby affecting the reliability of the product. UTILITY MODEL CONTENTS

[0009] The utility model aims to provide a vehicle-mounted cut-off unit and battery pack to solve the problems raised in the background art.

[0010] The utility model discloses a vehicle-mounted cut-off unit through the following technical scheme to realize the above-mentioned purpose.

[0011] The utility model discloses a vehicle-mounted cut-off unit, including upper cover and shell, and the PCB board set between two, and the BDU module assembled on the PCB board, and the spring for connecting the PCB board with the BDU module is inserted into the spring;

[0012] The BDU module includes a pin for signal lead-out, the spring includes a horizontal section and a plug-in section perpendicular to each other, the plug-in section passes through the PCB board and forms a crimp with the pin, and the horizontal section is fixedly connected by abutting on the end face of the PCB board.

[0013] Further, the BDU module includes a pre-charge resistor, a pre-charge relay, a heating relay, a heating fuse, a main fuse and a main relay.

[0014] Further, the vehicle-mounted cut-off unit further includes a screw for fixing the spring and the PCB board, and the PCB board is provided with a threaded seat matched with the screw.

[0015] Further, the threaded seat and the PCB board are connected by any one of welding, crimping and embedding injection molding on the PCB board shell.

[0016] Further, the horizontal section is fixedly connected by being welded on the end face of the PCB board.

[0017] Further, the horizontal section and the plug-in section are connected by a smooth circular arc transition.

[0018] Further, the plug-in section includes symmetrically arranged bending parts and an abutting part arranged in the recess space formed by the two bending parts, and the abutting part is in elastic contact with the pin.

[0019] Further, the PCB board is respectively provided with a clearance hole one for the plug-in section to pass through, and the horizontal section is provided with a clearance hole two for the screw to pass through.

[0020] Secondly, the utility model discloses a battery pack, including the vehicle-mounted cut-off unit as any above.

[0021] The utility model has the advantages of:

[0022] The utility model discloses a screw and hole cooperation completely absorbs the size chain tolerance of whole machine assembly, ensures that there is no difficulty to assemble, and has high reliability, whether it is spring and the cooperation of the insertion foot, or the screw fastening or welding on the PCB board is the mature application mode, and there is no big internal stress, and the above-mentioned assembly structure has the low -cost advantage, and the low tolerance, high reliability socket on the PCB board is saved, and the technological difficulty is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is the overall structure schematic diagram of the utility model.

[0024] Fig. 2 is the explosion structure schematic diagram of the utility model.

[0025] Fig. 3 is relay insertion foot structure schematic diagram in the utility model.

[0026] Fig. 4 is one kind of structure schematic diagram of spring in the utility model.

[0027] Fig. 5 is another structure schematic diagram of spring in the utility model.

[0028] Fig. 6 is the structure schematic diagram of screw and threaded seat assembly in the utility model.

[0029] In the drawing: 1, upper cover;2, PCB board;21, let one hole;22, threaded seat;3, shell;31, insertion foot;4, connecting piece;41, spring;411, horizontal section;412, insertion section;413, let two holes;4121, bending part;4122, abutment part;42, screw;5, BDU module. DETAILED DESCRIPTION

[0030] The following further describes the present application in conjunction with the drawings, and it is necessary to point out here that the following specific embodiments are only used to further illustrate the present application, and cannot be understood as limiting the scope of the present application, and the skilled person in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0031] Example 1

[0032] As shown in FIGS. 1-6, the present embodiment proposes a vehicle-mounted cut-off unit, which comprises a cover 1, a shell 3 (containing relays and other devices inside), a PCB board 2 (BMS main board) arranged between the cover 1 and the shell 3, a BDU module 5 (in the present embodiment, the BDU module 5 is each electrical device of the vehicle-mounted cut-off unit) assembled on the PCB board 2, and a spring pin 41 for connecting the PCB board 2 and the BDU module 5; the BDU module 5 comprises a pin 32 (a signal pin of each electrical device in the BDU module) for signal lead-out, and the spring pin 41 comprises a horizontal segment 411 and a plug-in segment 412 perpendicular to each other, the plug-in segment 412 is pressed to the pin 32 through the PCB board 2, and the horizontal segment 411 is fixedly connected to the upper end surface of the PCB board 2.

[0033] Further preferably, the vehicle-mounted cut-off unit further comprises a screw 42 for fixing the spring pin 41 and the PCB board 2, and the PCB board 2 is provided with a threaded seat 22 matched with the screw 42. The threaded seat 22 and the PCB board 2 are connected by any one of welding, pressing, and embedding injection molding on the shell of the PCB board 2.

[0034] It can be understood that, in the present embodiment, the screw 42 is a signal connection screw, and the spring pin 41 is a signal connection spring. Specifically, the horizontal segment 411 of the spring pin 41 is connected to the PCB board 2 by the screw 42 to form a signal connection point, and the plug-in segment 412 of the spring pin 41 is signal connected to the pin 32 through the PCB board 2. The plug-in segment 412 is matched with the pin 32 in shape.

[0035] Further preferably, the BDU module 5 at least comprises a pre-charge resistor, a pre-charge relay, a heating relay, a heating fuse, a main fuse, and a main relay.

[0036] In some preferred embodiments, the horizontal segment 411 is welded to the PCB board 2 to form a fixed connection. As a specific implementation, when the welding connection (i.e., the horizontal segment 411 of the spring pin 41 is welded to the PCB board 2) scheme is adopted, as long as the position of the horizontal segment of the spring pin is ensured to be on the solder pad of the PCB board 2, the assembly tolerance requirement can be met (for example, the width of the horizontal segment of the spring pin is 10 mm, and the width of the solder pad is 14 mm, and then the tolerance is ±2 mm).

[0037] Further preferably, the connection between the horizontal segment 411 and the plug-in segment 412 is a smooth circular arc transition. As shown in FIGS. 4 and 5, the plug-in segment 412 comprises two symmetrical bending portions 4121 and an abutting portion 4122 (specifically, a spring piece) arranged in the recess space formed by the two bending portions 4121. The abutting portion 4122 is in elastic contact with the pin 32, so that the spring pin 41 can be reliably pressed to the pin 32.

[0038] Further preferably, the PCB 2 is respectively provided with a first accommodating hole 21 for the insertion segment 412 to pass through, and the horizontal segment 411 is provided with a second accommodating hole 413 for the screw 42 to pass through.

[0039] According to the above embodiment, as a specific implementation, for example, the assembly scheme using the screw 42, before the vehicle-mounted cut-off unit is specifically used, the insertion spring 41 is assembled, specifically, the insertion segment 412 passes through the first accommodating hole 21 and forms a pressure joint with the insertion pin 32, and then the screw 42 is used to fix the insertion spring 41 on the PCB 2, so as to ensure that the signals of each relay can be introduced into the PCB, after the scheme is implemented, the main tolerance on the PCB 2 can be absorbed by the cooperation of the holes (the above-mentioned first accommodating hole 21 and the second accommodating hole 413) when the screw 42 and the insertion spring 41 are assembled. For example, if the hole is 5.6mm, the screw is M4 (diameter is 4mm, and pitch is 0.7mm), then a tolerance of ±0.8mm can be accommodated, which greatly improves the overall reliability of the system.

[0040] The embodiment further provides a battery pack comprising the vehicle-mounted cut-off unit as described above, wherein the vehicle-mounted cut-off unit is the vehicle-mounted cut-off unit as described above. The battery pack has all the beneficial effects of the vehicle-mounted cut-off unit as described above, which will not be repeated here.

[0041] More specifically, the vehicle-mounted cut-off unit in the embodiment is specifically an interface between the battery pack and an external high-voltage system, which is directly connected to the battery pack through precisely designed electrical connecting components (such as high-voltage copper bars, connectors and wire harness assemblies). This connection ensures the safe transmission and control of high-voltage power, and at the same time allows the vehicle-mounted cut-off unit to effectively monitor and manage the battery pack; the vehicle-mounted cut-off unit as described above performs functions of the battery pack including but not limited to the following: power-on and power-off control, pre-charging process management, charging process control and overload and short-circuit protection.

[0042] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An in-vehicle cut-off unit characterized by comprising: The vehicle-mounted cut-off unit comprises an upper cover (1) and a shell (3), a PCB board (2) arranged between the upper cover (1) and the shell (3), a BDU module (5) assembled on the PCB board (2), and a spring pin (41) for connecting the PCB board (2) and the BDU module (5). The BDU module comprises a pin (32) for signal lead-out, the spring pin (41) comprises a horizontal segment (411) and a plug-in segment (412) perpendicular to each other, the plug-in segment (412) passes through the PCB board (2) to form a press joint with the pin (32), and the horizontal segment (411) is fixedly connected to the upper end face of the PCB board (2).

2. The in-vehicle cut-off unit according to claim 1, characterized by: The BDU module (5) comprises a pre-charge resistor, a pre-charge relay, a heating relay, a heating fuse, a main fuse, and a main relay.

3. The in-vehicle cut-off unit according to claim 1, characterized by: The vehicle-mounted cut-off unit further comprises a screw (42) for fixing the spring pin (41) and the PCB board (2), and the PCB board (2) is provided with a threaded seat (22) matched with the screw (42).

4. The in-vehicle cut-off unit according to claim 3, characterized by: The threaded seat (22) and the PCB board (2) are connected by welding, press joint, or embedded injection molding on the shell of the PCB board (2).

5. The in-vehicle cut-off unit according to claim 1, characterized by: The horizontal segment (411) is welded to the upper end face of the PCB board (2) to form a fixed connection.

6. The in-vehicle cut-off unit according to claim 1, characterized by: The connection between the horizontal segment (411) and the plug-in segment (412) is a smooth arc transition.

7. The in-vehicle cut-off unit according to claim 1, characterized by: The plug-in segment (412) comprises symmetrically arranged bending portions (4121) and an abutting portion (4122) arranged in the recessed space formed by the two bending portions (4121), and the abutting portion (4122) is in elastic contact with the pin (32).

8. The in-vehicle cut-off unit according to claim 4, characterized by: The PCB board (2) is respectively provided with a first clearance hole (21) for the plug-in segment (412) to pass through, and the horizontal segment (411) is provided with a second clearance hole (413) for the screw (42) to pass through.

9. A battery pack, characterized by, The vehicle-mounted cut-off unit comprises the vehicle-mounted cut-off unit according to any one of claims 1-8. The vehicle-mounted cut-off unit comprises the vehicle-mounted cut-off unit according to any one of claims 1-8.

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