Battery cutoff unit and battery pack
By using a flexible circuit board to connect to the conductive row in the battery cut-off unit, the problems of OT terminal stacking and torque decay on the conductive row are solved, and the effect of stable connection and cost reduction is achieved.
Patent Information
- Application Number
- CN202421647390.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-11
AI Technical Summary
When temperature and voltage signals are collected at the same time on the conductive row, two or more OT terminals will be stacked. There will be torque decay after the nut is locked, resulting in missing OT terminal sampling signals.
The flexible circuit board is used to connect to the first conductive row and the second conductive row of the first main relay, and to the third conductive row and the fourth conductive row of the second main relay, so that the mutual entanglement between the plurality of wire harnesses is avoided and the screw connection of the harness OT terminal is eliminated.
Through the use of flexible circuit boards, the laminated structure of OT terminals is avoided, the stability of the connection is ensured, the failure efficiency of the sampling point connection is reduced, the number of screws and nuts is reduced, and the cost is reduced.
Smart Images
Figure CN222953334U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery cutting unit and a battery pack. Background Art
[0002] The battery disconnect unit (BDU) is an important module in the power battery pack. It provides the battery pack system with functions such as charge and discharge control, power-on control of high-voltage components, circuit overload and short-circuit protection, current, voltage and temperature acquisition, and protects and monitors the operating status of the high-voltage system.
[0003] The traditional battery disconnection unit is placed in the battery pack as an independent integrated module. The voltage and temperature sampling on high-voltage components such as relays need to be connected with a wiring harness, which is installed on the high-voltage connector as an output port and then connected to the battery management system (BMS). However, when connecting the wiring harness to the conductive bar connected to high-voltage components such as relays, it is necessary to press rivet screws on the conductive bar and use nuts to fix the OT terminal on the wiring harness. Because the temperature and voltage signals need to be collected on the conductive bar at the same time, there will be a structure with two or more OT terminals stacked. After the nut is tightened, there will be a problem of torque decay, resulting in the loss of the OT terminal sampling signal. Utility Model Content
[0004] In view of this, the utility model provides a battery cut-off unit and a battery pack to solve the problem of simultaneously collecting temperature and voltage signals on the conductive bus, resulting in a structure with two or more OT terminals stacked, and torque decay after the nut is tightened, resulting in missing OT terminal sampling signals.
[0005] In the first aspect, the utility model provides a battery cut-off unit, comprising a shell, a first main relay, a second main relay, a flexible circuit board and a current sensor; the first main relay is fixed in the shell, comprising a first conductive bar and a second conductive bar, and the first conductive bar and the second conductive bar are spaced apart; the second main relay is spaced apart from the first main relay, fixed in the shell, comprising a third conductive bar and a fourth conductive bar, and the third conductive bar and the fourth conductive bar are spaced apart; the flexible circuit board is located in the shell, and is welded to the first conductive bar, the second conductive bar, the third conductive bar and the fourth conductive bar; the current sensor is spaced apart from the second main relay, fixed in the shell, and is welded to the flexible circuit board, and is used to connect to the battery management system signal.
[0006] Beneficial effects: By connecting the flexible circuit board to the first conductive bar and the second conductive bar of the first main relay, and to the third conductive bar and the fourth conductive bar of the second main relay, mutual entanglement between multiple wire harnesses is avoided, and the screw connection of the OT terminal of the wire harness is omitted, and the stacked structure of the OT terminal is avoided, thereby ensuring the stability of the connection between the first main relay, the second main relay and the flexible circuit board, and reducing the failure rate of the sampling point connection; reducing the number of rivet screws and fixing nuts on the first conductive bar, the second conductive bar, the third conductive bar and the fourth conductive bar; and by directly connecting the current sensor to the flexible circuit board, the flexible circuit board can transmit all collected high voltage and temperature signals to the current sensor, eliminating the setting of the high voltage connector on the high voltage sampling harness, and reducing costs.
[0007] In an optional embodiment, the first conductive bar extends along the width direction of the shell; the current sensor is arranged opposite to the first conductive bar; the flexible circuit board is located between the first conductive bar and the current sensor, and its two ends are respectively connected to the first conductive bar and the current sensor.
[0008] Beneficial effect: By setting the first conductive row to extend along the width direction of the shell and setting the flexible circuit board between the first conductive row and the current sensor, the volume of the battery cut-off unit is reduced, and it is convenient to connect the flexible circuit board with the first conductive row and the current sensor. The length of the flexible circuit board is effectively controlled, thus avoiding structural waste and achieving a reasonable spatial layout.
[0009] In an optional embodiment, the second conductive bar, the third conductive bar and the fourth conductive bar are located between the first conductive bar and the current sensor, and are spaced apart in sequence along the length direction of the shell; three branch pads are provided on the flexible circuit board, and the three branch pads are spaced apart in sequence along the length direction of the shell, and are respectively connected to the second conductive bar, the third conductive bar and the fourth conductive bar.
[0010] Beneficial effect: By setting the branch pads, the connection between the flexible circuit board and the second conductive row, the third conductive row and the fourth conductive row is achieved.
[0011] In an optional embodiment, a cover is provided on one side of the shell, and the cover is detachably connected to the shell.
[0012] Beneficial effects: By arranging a cover body on one side of the shell, a closed cavity is formed between the shell and the cover body, which can effectively protect various structures inside the shell; and because the cover body and the shell are detachably connected, it is convenient to install the first main relay, the second main relay, the flexible circuit board and the current sensor inside the shell, thereby improving the disassembly and maintenance efficiency of the battery cut-off unit, improving the quality and performance of the battery cut-off unit, and promoting the upgrade and maintenance of the battery cut-off unit.
[0013] In an optional implementation, the first conductive bar and the second conductive bar are arranged on a side of the first main relay close to the cover.
[0014] Beneficial effect: By arranging the first conductive bar and the second conductive bar on the side close to the cover body, the first main relay is installed inside the shell, and then the first conductive bar and the second conductive bar are installed, which facilitates the disassembly and assembly of the first conductive bar and the second conductive bar, and avoids interference between the first conductive bar and the second conductive bar and other structures in the shell.
[0015] In an optional implementation, the third conductive bar and the fourth conductive bar are arranged on a side of the second main relay close to the cover.
[0016] Beneficial effect: By arranging the third conductive bar and the fourth conductive bar on a side close to the cover body, the third conductive bar and the fourth conductive bar are installed after the second main relay is installed inside the shell, which facilitates the disassembly and assembly of the third conductive bar and the fourth conductive bar, and avoids interference between the third conductive bar and the fourth conductive bar and other structures in the shell.
[0017] In an optional implementation, the flexible circuit board is arranged on a side of the first conductive row close to the cover.
[0018] Beneficial effects: By arranging the flexible circuit board on the side of the first conductive bar away from the first main relay, that is, the flexible circuit board is arranged close to the cover body, it is convenient to overlap the two ends of the flexible circuit board on the first conductive bar or the current sensor, which helps to achieve the welding connection between the flexible circuit board and the first conductive bar or the current sensor; and it is convenient to overlap the three branch pads on the second conductive bar, the third conductive bar and the fourth conductive bar respectively, which helps to achieve the welding connection between the three branch pads and the second conductive bar, the third conductive bar and the fourth conductive bar respectively.
[0019] In an optional implementation, the current sensor further includes a low voltage connector, and the low voltage connector is used to be electrically connected to a battery management system.
[0020] Beneficial effect: Through the setting of the low-voltage connector, an electrical connection with the battery management system is achieved, thereby realizing the integrated output of the high-voltage signal of the battery cut-off unit.
[0021] In an optional implementation, the cover body is provided with a through hole, and the through hole corresponds to the position of the low-voltage connector.
[0022] Beneficial effect: By setting a through hole on the cover body, it is convenient for the connecting wire harness to pass through the through hole and connect with the low-voltage connector, which helps to achieve electrical connection between the low-voltage connector and the battery management system.
[0023] In a second aspect, the utility model further provides a battery pack, comprising the above-mentioned battery disconnection unit.
[0024] Beneficial effect: Because the battery pack includes a battery cut-off unit, it has the same effect as the battery cut-off unit and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0026] Figure 1 This is a schematic diagram of the internal structure of a battery disconnection unit according to an embodiment of the utility model;
[0027] Figure 2 This is a front view of a battery disconnection unit according to an embodiment of the utility model;
[0028] Figure 3 It is an exploded view of a battery disconnection unit according to an embodiment of the present utility model.
[0029] Description of reference numerals:
[0030] 1. Housing; 2. First main relay; 21. First conductive bar; 22. Second conductive bar; 3. Second main relay; 31. Third conductive bar; 32. Fourth conductive bar; 4. Flexible circuit board; 41. Branch pad; 5. Current sensor; 51. Low voltage connector; 52. Circuit board; 6. Cover; 61. Through hole; 7. Pre-charge relay; 8. Pre-charge resistor; 9. Main fuse. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0032] Combine the following Figures 1 to 3 , describing an embodiment of the utility model.
[0033] According to an embodiment of the utility model, on the one hand, a battery cut-off unit is provided, including a shell 1, a first main relay 2, a second main relay 3, a flexible circuit board 4 and a current sensor 5; the first main relay 2 is fixed in the shell 1, including a first conductive bar 21 and a second conductive bar 22, and the first conductive bar 21 and the second conductive bar 22 are arranged at intervals; the second main relay 3 is arranged at intervals from the first main relay 2, fixed in the shell 1, including a third conductive bar 31 and a fourth conductive bar 32, and the third conductive bar 31 and the fourth conductive bar 32 are arranged at intervals; the flexible circuit board 4 is located in the shell 1, and is welded to the first conductive bar 21, the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32; the current sensor 5 is arranged at intervals from the second main relay 3, fixed in the shell 1, and is welded to the flexible circuit board 4, and is used for signal connection with a battery management system.
[0034] By connecting the flexible circuit board 4 to the first conductive bar 21 and the second conductive bar 22 of the first main relay 2, and to the third conductive bar 31 and the fourth conductive bar 32 of the second main relay 3, the mutual entanglement of multiple wire harnesses is avoided, and the screw connection of the OT terminal of the wire harness is omitted, and the stacked structure of the OT terminal is avoided, thereby ensuring the stability of the connection between the first main relay 2, the second main relay 3 and the flexible circuit board 4, and reducing the failure rate of the sampling point connection; reducing the number of rivet screws and fixing nuts on the first conductive bar 21, the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32; and by directly connecting the current sensor 5 to the flexible circuit board 4, the flexible circuit board 4 can transmit all collected high voltage and temperature signals to the current sensor 5, eliminating the setting of the high voltage connector on the high voltage sampling harness, and reducing the cost.
[0035] In a specific implementation, the battery disconnection unit further includes a pre-charging relay 7 , a pre-charging resistor 8 and a main fuse 9 , and the pre-charging relay 7 , the pre-charging resistor 8 and the main fuse 9 are all fixed in the housing 1 .
[0036] Specifically, the first main relay 2 is a main positive relay, and the second main relay 3 is a main negative relay.
[0037] Specifically, the first conductive bar 21 , the second conductive bar 22 , the third conductive bar 31 and the fourth conductive bar 32 are conductive copper bars, conductive aluminum bars, or copper-aluminum composite bars.
[0038] In one embodiment, the first conductive bar 21 extends along the width direction of the shell 1; the current sensor 5 is arranged opposite to the first conductive bar 21; the flexible circuit board 4 is located between the first conductive bar 21 and the current sensor 5, and its two ends are respectively connected to the first conductive bar 21 and the current sensor 5.
[0039] By setting the first conductive bar 21 to extend along the width direction of the shell 1 and setting the flexible circuit board 4 between the first conductive bar 21 and the current sensor 5, the volume of the battery cut-off unit is reduced, and it is convenient to connect the flexible circuit board 4 with the first conductive bar 21 and the current sensor 5. The length of the flexible circuit board 4 is effectively controlled, thereby avoiding structural waste and achieving a reasonable spatial layout.
[0040] In an alternative embodiment, two branch pads 41 are respectively provided at two ends of the flexible circuit board 4 , and the two branch pads 41 are respectively welded to the first conductive row 21 and the current sensor 5 .
[0041] In one embodiment, the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32 are located between the first conductive bar 21 and the current sensor 5, and are arranged in sequence along the length direction of the shell 1; three branch pads 41 are provided on the flexible circuit board 4, and the three branch pads 41 are arranged in sequence along the length direction of the shell 1 and are connected to the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32 respectively.
[0042] By providing the branch pads 41 , the connection between the flexible circuit board 4 and the second conductive row 22 , the third conductive row 31 and the fourth conductive row 32 is achieved.
[0043] In a specific embodiment, the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32 all extend along the length direction of the shell 1, that is, the second conductive bar 22, the third conductive bar 31 or the fourth conductive bar 32 are arranged in parallel with the flexible circuit board 4; the three branch pads 41 are arranged in sequence at intervals along the length direction of the shell 1 and are arranged perpendicular to the flexible circuit board 4, which helps to achieve a welding connection between the flexible circuit board 4 and the second conductive bar 22, the third conductive bar 31 or the fourth conductive bar 32.
[0044] In one embodiment, a cover body 6 is provided on one side of the housing 1 , and the cover body 6 is detachably connected to the housing 1 .
[0045] By providing a cover body 6 on one side of the shell 1, a closed cavity is formed between the shell 1 and the cover body 6, which can effectively protect the various structures inside the shell 1; and because the cover body 6 and the shell 1 are detachably connected, it is convenient to install the first main relay 2, the second main relay 3, the flexible circuit board 4 and the current sensor 5 inside the shell 1, thereby improving the disassembly, assembly and maintenance efficiency of the battery cut-off unit, improving the quality and performance of the battery cut-off unit, and promoting the upgrade and maintenance of the battery cut-off unit.
[0046] In a specific embodiment, the shell 1 and the cover 6 are detachably connected via a buckle.
[0047] In one embodiment, both sides of the shell 1 are detachably connected to both sides of the cover 6 by buckles. In another embodiment, one side of the shell 1 is hingedly connected to one side of the cover 6, and the other side of the shell 1 is detachably connected to the other side of the cover 6 by buckles or other structures.
[0048] In an alternative embodiment, the housing 1 and the cover 6 may also be detachably connected via fasteners such as screws.
[0049] In a specific embodiment, the housing 1 is made of plastic material, and the cover 6 is made of plastic material.
[0050] In a specific embodiment, a battery positive electrode interface, a battery negative electrode interface, a positive electrode output port and a negative electrode output port are provided on the cover body 6, and corresponding text labels are provided on one side of the battery positive electrode interface, the battery negative electrode interface, the positive electrode output port and the negative electrode output port to facilitate the operator to connect the battery disconnection unit.
[0051] In one embodiment, the first conductive bar 21 and the second conductive bar 22 are disposed on a side of the first main relay 2 close to the cover 6 .
[0052] By arranging the first conductive bar 21 and the second conductive bar 22 on a side close to the cover body 6, the first main relay 2 is installed inside the housing 1, and then the first conductive bar 21 and the second conductive bar 22 are installed, so that the first conductive bar 21 and the second conductive bar 22 are easily assembled and disassembled, and interference between the first conductive bar 21 and the second conductive bar 22 and other structures in the housing 1 is avoided.
[0053] In one embodiment, the third conductive bar 31 and the fourth conductive bar 32 are disposed on a side of the second main relay 3 close to the cover 6 .
[0054] By arranging the third conductive bar 31 and the fourth conductive bar 32 on a side close to the cover body 6, the third conductive bar 31 and the fourth conductive bar 32 are installed after the second main relay 3 is installed inside the housing 1, so that the third conductive bar 31 and the fourth conductive bar 32 are easily assembled and disassembled, and interference between the third conductive bar 31 and the fourth conductive bar 32 and other structures in the housing 1 is avoided.
[0055] In one embodiment, the flexible circuit board 4 is disposed on a side of the first conductive row 21 close to the cover 6 .
[0056] By arranging the flexible circuit board 4 on the side of the first conductive bar 21 away from the first main relay 2, that is, the flexible circuit board 4 is arranged close to the cover body 6, it is convenient to overlap the two ends of the flexible circuit board 4 on the first conductive bar 21 or the current sensor 5, which helps to achieve the welding connection between the flexible circuit board 4 and the first conductive bar 21 or the current sensor 5; and it is convenient to overlap the three branch pads 41 on the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32 respectively, which helps to achieve the welding connection between the three branch pads 41 and the second conductive bar 22, the third conductive bar 31 and the fourth conductive bar 32 respectively.
[0057] In one embodiment, the current sensor 5 further includes a low voltage connector 51 , and the low voltage connector 51 is used for being electrically connected to a battery management system.
[0058] By providing the low voltage connector 51 , an electrical connection with the battery management system is achieved, thereby realizing an integrated output of the high voltage signal of the battery cut-off unit.
[0059] In one embodiment, a through hole 61 is formed on the cover body 6 , and the through hole 61 corresponds to the position of the low-voltage connector 51 .
[0060] By providing a through hole 61 on the cover body 6 , it is convenient for the connecting wire harness to pass through the through hole 61 and connect to the low-voltage connector 51 , which helps to achieve electrical connection between the low-voltage connector 51 and the battery management system.
[0061] In a specific implementation, the current sensor 5 includes a circuit board 52 , the flexible circuit board 4 is connected to the circuit board 52 by welding, and the low-voltage connector 51 is arranged on the circuit board 52 .
[0062] Specifically, the flexible circuit board 4 is welded to the first conductive row 21 and the second conductive row 22 of the first main relay 2, and the third conductive row 31 and the fourth conductive disk of the second main relay 3 to perform high voltage and temperature sampling; the flexible circuit board 4 is welded to the circuit board 52 of the current sensor 5 to transmit all collected high voltage and temperature signals to the circuit board 52 on the current sensor 5. The circuit board 52 integrates the high voltage sampling, temperature signal, and the temperature collection signal and voltage collection signal inside the current sensor 5 into a low voltage connector 51, and is connected to the battery management system through the low voltage connector 51 to realize the integrated output of the high voltage signal of the battery cut-off unit.
[0063] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising the above-mentioned battery disconnection unit.
[0064] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A battery disconnection unit, characterized in that: include: Housing (1); A first main relay (2) is fixed in the housing (1), comprising a first conductive bar (21) and a second conductive bar (22), wherein the first conductive bar (21) and the second conductive bar (22) are arranged at an interval; A second main relay (3) is arranged at a distance from the first main relay (2), fixed in the housing (1), and comprises a third conductive bar (31) and a fourth conductive bar (32), wherein the third conductive bar (31) and the fourth conductive bar (32) are arranged at a distance; A flexible circuit board (4) is located in the housing (1) and is welded to the first conductive bar (21), the second conductive bar (22), the third conductive bar (31) and the fourth conductive bar (32); The current sensor (5) is arranged at a distance from the second main relay (3), fixed in the housing (1), and connected to the flexible circuit board (4) by welding, and is used for signal connection with the battery management system.
2. The battery disconnect unit according to claim 1, characterized in that: The first conductive bar (21) extends along the width direction of the housing (1); the current sensor (5) and the first conductive bar (21) are arranged opposite to each other; the flexible circuit board (4) is located between the first conductive bar (21) and the current sensor (5), and two ends of the flexible circuit board (4) are respectively connected to the first conductive bar (21) and the current sensor (5).
3. The battery disconnection unit according to claim 2, characterized in that: The second conductive bar (22), the third conductive bar (31) and the fourth conductive bar (32) are located between the first conductive bar (21) and the current sensor (5), and are arranged in sequence and spaced apart along the length direction of the housing (1); three branch pads (41) are provided on the flexible circuit board (4), and the three branch pads (41) are arranged in sequence and spaced apart along the length direction of the housing (1), and are respectively connected to the second conductive bar (22), the third conductive bar (31) and the fourth conductive bar (32).
4. The battery disconnect unit according to any one of claims 1 to 3, characterized in that: A cover body (6) is provided on one side of the shell (1), and the cover body (6) is detachably connected to the shell (1).
5. The battery disconnection unit according to claim 4, characterized in that: The first conductive bar (21) and the second conductive bar (22) are arranged on a side of the first main relay (2) close to the cover (6).
6. The battery disconnection unit according to claim 5, characterized in that: The third conductive bar (31) and the fourth conductive bar (32) are arranged on a side of the second main relay (3) close to the cover (6).
7. The battery disconnect unit according to claim 6, characterized in that: The flexible circuit board (4) is arranged on a side of the first conductive row (21) close to the cover body (6).
8. The battery disconnect unit according to any one of claims 5 to 7, characterized in that: The current sensor (5) further comprises a low voltage connector (51), wherein the low voltage connector (51) is used for being electrically connected to a battery management system.
9. The battery disconnect unit according to claim 8, characterized in that: The cover body (6) is provided with a through hole (61), and the through hole (61) corresponds to the position of the low-voltage connector (51).
10. A battery pack, characterized in that: The invention comprises the battery disconnection unit according to any one of claims 1 to 9.