Battery circuit breaking unit and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery circuit breaking unit and a battery pack, the battery circuit breaking unit is arranged in the battery pack, the battery circuit breaking unit comprises a circuit board, a control circuit is configured on the circuit board, and the circuit board is respectively provided with a first conductive interface and a second conductive interface. The first conductive interface and the second conductive interface are located in the control circuit; the relay is provided with a first connector and a second connector, the first connector is arranged in the first conductive interface in a penetrating mode and connected with the circuit board, and the first connector is electrically connected with the first conductive interface; the second connector penetrates through the second conductive interface and is connected with the circuit board, and the second conductive connector is electrically connected with the second conductive interface. The battery circuit breaking unit and the battery pack provided by the utility model are compact in structure, high in integration, easy to assemble and maintain and reliable in connection.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a battery circuit breaking unit and battery pack. BACKGROUND

[0002] Battery management system (BMS) is the core component of electric vehicle, hybrid electric vehicle and other battery power supply system, responsible for monitoring and managing the state of battery, ensuring its safe and efficient work. Battery disconnect unit (BDU) as a key subsystem of battery management system, is specially responsible for quickly disconnecting the connection between battery and load in emergency, ensuring the safety of battery. However, in the existing battery circuit breaking unit, high-power relay is usually connected with battery or other load device through independently designed copper bar. This traditional copper bar connection method has the problems of large space occupation, complex assembly, poor reliability and low integration. Specifically, copper bar needs additional space for installation and wiring, especially in high-power applications, the size of copper bar is large, which increases the volume of the whole system, making it difficult to meet the needs of miniaturization and compactness, and when copper bar is connected, multiple connection points are formed, which not only increases the complexity and time cost of assembly, but also easily causes poor contact or looseness, affecting the reliability of the system. In addition, traditional copper bar is usually an independent component, which needs to be designed and installed separately from other circuit elements, resulting in low integration of the system, which is not conducive to modular design and subsequent maintenance and upgrade. SUMMARY

[0003] The utility model aims at the above problems existing in prior art, and provides a battery circuit breaking unit which is compact in structure, high in integration, easy to assemble and maintain, and reliable in connection.

[0004] On the other hand, a battery pack is provided, which is compact in structure, high in integration, easy to assemble and maintain, and stable in performance.

[0005] The utility model can be realized by the following technical scheme, a battery circuit breaking unit is built-in in battery pack, comprising:

[0006] A circuit board is configured with a control circuit, and a first conductive interface and a second conductive interface are respectively arranged on the circuit board, and the first conductive interface and the second conductive interface are in the control circuit;

[0007] A relay is respectively configured with a first connector and a second connector, the first connector is arranged in the first conductive interface and connected with the circuit board, and the first connector is electrically connected with the first conductive interface; the second connector is arranged in the second conductive interface and connected with the circuit board, and the second conductive connector is electrically connected with the second conductive interface.

[0008] In the aforementioned battery circuit breaker unit, the first conductive interface includes a first mounting hole penetrating the circuit board and a first current-carrying pad disposed within the first mounting hole, and the first current-carrying pad is provided with a first through hole for the first connector to pass through; when the first connector is disposed in the first through hole, the first current-carrying pad abuts against the first mounting hole and the first connector respectively.

[0009] In the aforementioned battery circuit breaker unit, the second conductive interface includes a second mounting hole penetrating the circuit board and a second current-carrying pad disposed within the second mounting hole, and the second current-carrying pad is provided with a second through hole for the second connector to pass through; when the second connector is disposed in the second through hole, the second current-carrying pad abuts against the second mounting hole and the second connector respectively.

[0010] In the aforementioned battery circuit breaker unit, the first current-carrying pad is welded to the first mounting hole, and the second current-carrying pad is welded to the second mounting hole.

[0011] In the aforementioned battery circuit breaker unit, the first current-carrying pad and the second current-carrying pad have the same structure, both including a first connecting portion and a second connecting portion, wherein the diameter of the first connecting portion is smaller than the diameter of the first mounting hole and the second mounting hole, and the diameter of the second connecting portion is larger than the diameter of the first mounting hole and the second mounting hole.

[0012] In the aforementioned battery circuit breaker unit, the circuit board is further provided with a plurality of through-holes, which are located above the second connecting part and arranged circumferentially around the center line of the second connecting part.

[0013] In the aforementioned battery circuit breaker unit, the first connector passes through the first through hole and is detachably connected to the circuit board via a first locking nut, and the second connector passes through the second through hole and is detachably connected to the circuit board via a second locking nut.

[0014] In the aforementioned battery circuit breaker unit, upper washers are provided between the first locking nut and the first current-carrying washer, and between the second locking nut and the second current-carrying washer; lower washers are provided between the first current-carrying washer and the relay, and between the second current-carrying washer and the relay.

[0015] In the aforementioned battery circuit breaker unit, a clearance groove is provided between the first conductive interface and the second conductive interface, and the clearance groove penetrates the circuit board.

[0016] A battery pack includes a housing, wherein the housing is provided with the aforementioned battery circuit breaker unit.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a first conductive interface and a second conductive interface on a circuit board equipped with a control circuit, the first and second connectors of the relay are directly passed through the first and second conductive interfaces and electrically connected to the circuit board. This design not only significantly reduces the need for additional copper busbars, saving space and making the entire system more compact, but also simplifies the assembly steps, reduces the risk of assembly errors, and improves production efficiency and system reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery circuit breaker unit in an embodiment of this utility model.

[0019] Figure 2 This is an exploded view of the battery circuit breaker unit in an embodiment of this utility model.

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 This is an exploded view of the battery pack in an embodiment of this utility model.

[0022] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 100, circuit board; 110, first mounting hole; 120, second mounting hole; 130, solder hole; 140, clearance groove; 200, relay; 210, first connector; 220, second connector; 300, first current-carrying gasket; 310, first through hole; 320, first connecting part; 330, second connecting part; 400, second current-carrying gasket; 410, second through hole; 500, first locking nut; 510, second locking nut; 600, upper washer; 610, lower washer; 700, housing; 710, outer casing; 720, top cover. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] like Figures 1 to 4 As shown, a battery circuit breaker unit, built into a battery pack, includes:

[0026] The circuit board 100 is equipped with a control circuit, and the circuit board 100 is provided with a first conductive interface and a second conductive interface, and the first conductive interface and the second conductive interface are located in the control circuit.

[0027] The relay 200 is equipped with a first connector 210 and a second connector 220. The first connector 210 passes through a first conductive interface and connects to the circuit board 100, and is electrically connected to the first conductive interface. The second connector 220 passes through a second conductive interface and connects to the circuit board 100, and is electrically connected to the second conductive interface. Because the relay 200 is directly integrated into the first and second conductive interfaces of the circuit board 100, the need for traditional copper busbars is eliminated, effectively saving installation space and making the entire system more compact. This helps meet the miniaturization and lightweight requirements of modern battery management systems (BMS), making it particularly suitable for space-constrained applications such as electric vehicles and hybrid vehicles. Furthermore, the reduced number of connection points between the relay 200 and electrical components simplifies the assembly process, reduces the risk of assembly errors, improves production efficiency, and reduces the risk of poor contact or loosening, further enhancing system reliability. Moreover, this design allows the relay 200 to be integrated onto the circuit board 100, forming a highly integrated modular design, thereby simplifying circuit layout and improving the convenience of subsequent maintenance and upgrades. In addition, other components on the circuit board 100 (such as sensors, controllers, resistors, etc.) can work closely with the relay 200 to achieve more efficient signal transmission and control logic.

[0028] Specifically, such as Figures 1 to 3 As shown, in this embodiment, the battery disconnection unit includes a circuit board 100, a relay 200, and several components disposed on the circuit board 100. These components, together with the circuit board 100, constitute a control circuit for monitoring and managing the battery status. The relay 200 is connected to the circuit board 100 and is used to disconnect the battery from the load in an emergency to ensure battery safety.

[0029] In this embodiment, the circuit board 100 is a PCB board, on which a first conductive interface and a second conductive interface are respectively provided. The first and second conductive interfaces are located on the critical path of the control circuit. The first conductive interface is used to connect to the positive terminal of the battery, and the second conductive interface is used to connect to the negative terminal of the battery. Through the first and second conductive interfaces, current can flow from the battery to the control circuit and finally to the load device. The first connector 210 and the second connector 220 of the relay 200 are respectively inserted into the first and second conductive interfaces, forming a reliable electrical connection and ensuring that the relay 200 can function as a switch in the control circuit. When the relay 200 is closed, current can be smoothly transmitted through the first and second conductive interfaces; when the relay 200 is open, the current path is cut off, ensuring safe isolation between the battery and the load. This design not only simplifies the circuit layout but also improves the reliability and safety of the system.

[0030] In this embodiment, the first conductive interface includes a first mounting hole 110 penetrating the circuit board 100 and a first current-carrying pad 300 disposed within the first mounting hole 110. The first current-carrying pad 300 has a first through hole 310 for the first connector 210 to pass through. When the first connector 210 passes through the first through hole 310, the first current-carrying pad 300 abuts against both the first mounting hole 110 and the first connector 210. Specifically, the outer wall of the first current-carrying pad 300 abuts against the first mounting hole 110, and the inner wall abuts against the first connector 210. The introduction of the first current-carrying pad 300 not only provides a larger contact area for the connection between the relay 200 and the circuit board 100, ensuring good contact between the first connector 210 and the circuit board 100, but also enhances mechanical strength, ensuring the stability of the connection between the two, effectively reducing the risk of poor contact or loosening, and enabling the two to maintain a reliable electrical connection under vibration or shock environments, thereby effectively improving the reliability of the connection between the relay 200 and the circuit board 100.

[0031] In this embodiment, the second conductive interface includes a second mounting hole 120 penetrating the circuit board 100, and a second current-carrying pad 400 disposed within the second mounting hole 120. The second current-carrying pad 400 has a second through hole 410 for the second connector 220 to pass through. When the second connector 220 passes through the second through hole 410, the second current-carrying pad 400 abuts against the second mounting hole 120 and the second connector 220, respectively. Specifically, the outer wall of the second current-carrying pad 400 abuts against the second mounting hole 120, and the inner wall abuts against the second connector 220. The introduction of the second current-carrying pad 400 not only provides a larger contact area for the connection between the relay 200 and the circuit board 100, ensuring good contact between the second connector 220 and the circuit board 100, but also enhances mechanical strength, ensuring the stability of the connection between the two, effectively reducing the risk of poor contact or loosening, and enabling the two to maintain a reliable electrical connection under vibration or shock environments, thereby effectively improving the reliability of the connection between the relay 200 and the circuit board 100. In addition, the design also ensures the consistency of the connection between the first connector 210, the second connector 220 and the circuit board 100.

[0032] In this embodiment, both the first mounting hole 110 and the second mounting hole 120 are elliptical and aligned on the same straight line. This design provides a larger contact area than a circle, thereby improving current transmission efficiency and reducing contact resistance and heat generation. Furthermore, the straight-line alignment makes the installation and maintenance of the relay 200 more convenient, especially when replacement or repair is required, allowing operators to more easily locate the corresponding interface and reducing maintenance time.

[0033] Preferably, in this embodiment, both the first current-carrying pad 300 and the second current-carrying pad 400 are made of copper. By using current-carrying pads made of copper, not only is the contact resistance significantly reduced, energy loss and heat generation during current transmission reduced, and the overall efficiency of the system improved, but the heat dissipation path is also optimized, ensuring the thermal stability of the system and extending its service life.

[0034] In this embodiment, the first current-carrying pad 300 is soldered to the first mounting hole 110, and the second current-carrying pad 400 is soldered to the second mounting hole 120. This soldering method ensures a firm connection between the current-carrying pads and the circuit board 100, effectively preventing loosening under vibration or shock conditions and improving system reliability. Furthermore, soldering ensures stable electrical connection of the current-carrying pads during long-term use, preventing loosening due to temperature changes or vibration, thereby extending the system's service life.

[0035] In this embodiment, the first current-carrying pad 300 and the second current-carrying pad 400 have the same structure, both being boss-shaped, including an integrally formed first connecting portion 320 and a second connecting portion 330. The diameter of the first connecting portion 320 is smaller than the diameter of the first mounting hole 110 and the second mounting hole 120, while the diameter of the second connecting portion 330 is larger than the diameter of the first mounting hole 110 and the second mounting hole 120. This design not only ensures a larger contact area between the current-carrying pad and the circuit board 100 and the connector, reducing contact resistance and improving current transmission efficiency, but also makes the connection between the current-carrying pad and the circuit board 100 more reliable. Furthermore, this design enables rapid positioning of the first current-carrying pad 300 and the second current-carrying pad 400, allowing them to be efficiently assembled into the first mounting hole 110 and the second mounting hole 120 for welding, effectively improving production efficiency.

[0036] Preferably, in this embodiment, the first connecting part 320 is elliptical and matches the shape and size of the first mounting hole 110 and the second mounting hole 120, and the second connecting part 330 is circular.

[0037] In this embodiment, the circuit board 100 is also provided with a plurality of through-holes 130. These through-holes 130 are located above the second connecting portion 330 and are arranged circumferentially around the center line of the second connecting portion 330. This design provides more soldering points for soldering the circuit board 100 and the second connecting portion 330, which not only improves the soldering quality and strengthens the connection between the current-carrying pad and the circuit board 100, but also provides more heat dissipation paths, ensuring that the heat generated during the soldering process can be quickly conducted away, and avoiding overheating of the soldering area.

[0038] In this embodiment, a clearance groove 140 is provided between the first conductive interface and the second conductive interface. This clearance groove 140 penetrates the circuit board 100 and is mainly used to accommodate protruding components on the relay 200 (such as the fixing bracket or heat sink of the relay 200 housing 710), ensuring that the relay 200 can be stably installed on the circuit board 100 while effectively avoiding physical interference between the circuit board 100 and the relay 200. Preferably, the shape of the clearance groove 140 is customized according to the specific structure of the relay 200 to ensure that it can precisely match the protruding parts on the relay 200. This customized design not only ensures the smooth installation of the relay 200 but also reduces unnecessary space occupation, making the entire system more compact.

[0039] In this embodiment, the relay 200 is respectively equipped with a first connector 210 and a second connector 220. The first connector 210 passes through the first through hole 310 and is electrically connected to the first current-carrying pad 300. The second connector 220 passes through the second through hole 410 and is electrically connected to the second current-carrying pad 400. The first connector 210 and the second connector 220 are detachably connected to the circuit board 100 through the first current-carrying pad 300 and the second current-carrying pad 400, respectively. Specifically, the first connector 210 and the second connector 220 are detachably passed through the first through hole 310 and the second through hole 410 from bottom to top, respectively, to achieve connection with the circuit board 100. This not only effectively improves the convenience of disassembly, assembly, and maintenance of the relay 200, but also makes the overall structure of the battery circuit breaker unit more compact, realizing miniaturization and integration design.

[0040] In this embodiment, the first connector 210 passes through the first through hole 310 and is detachably connected to the circuit board 100 via the first locking nut 500. Similarly, the second connector 220 passes through the second through hole 410 and is detachably connected to the circuit board 100 via the second locking nut 510. Specifically, both the first connector 210 and the second connector 220 have threads, which are threadedly connected to the first locking nut 500 and the second locking nut 510, respectively. This design simplifies the maintenance and replacement of the relay 200, significantly reduces assembly and repair time, improves production efficiency, and lowers maintenance costs.

[0041] In this embodiment, upper washers 600 are provided between the first locking nut 500 and the first current-carrying washer 300, and between the second locking nut 510 and the second current-carrying washer 400; lower washers 610 are provided between the first current-carrying washer 300 and the relay 200, and between the second current-carrying washer 400 and the relay 200. This design ensures good contact between the contact surfaces, reducing the risk of poor contact or loosening, especially under mechanical vibration or impact conditions. Furthermore, the upper washers 600 and lower washers 610 evenly distribute mechanical stress on the contact surfaces, avoiding stress concentration and enhancing the mechanical strength and reliability of the connection.

[0042] like Figure 4As shown, this embodiment of the present invention also provides a battery pack, which includes a housing 700. The housing 700 is a split design, including a detachably connected outer shell 710 and a cover plate. The outer shell 710 and the cover plate cooperate to form a sealed accommodating cavity, in which the aforementioned battery circuit breaker unit is detachably disposed. This design integrates the battery circuit breaker unit into the housing 700 of the battery pack, forming a highly integrated system, effectively simplifying the assembly process and reducing assembly complexity and maintenance difficulty. Furthermore, the compact design of the battery circuit breaker unit makes the entire battery pack smaller and more space-efficient, making it particularly suitable for applications with high space requirements, such as electric vehicles and hybrid vehicles.

[0043] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A battery circuit breaker unit, built into a battery pack, characterized in that, include: A circuit board having a control circuit configured thereon, and the circuit board having a first conductive interface and a second conductive interface respectively, wherein the first conductive interface and the second conductive interface are located in the control circuit; A relay is provided with a first connector and a second connector. The first connector passes through the first conductive interface and is connected to the circuit board, and the first connector is electrically connected to the first conductive interface. The second connector passes through the second conductive interface and is connected to the circuit board, and the second connector is electrically connected to the second conductive interface.

2. The battery circuit breaker unit according to claim 1, characterized in that, The first conductive interface includes a first mounting hole penetrating the circuit board and a first current-carrying pad disposed in the first mounting hole, and the first current-carrying pad is provided with a first through hole for the first connector to pass through; when the first connector is inserted into the first through hole, the first current-carrying pad abuts against the first mounting hole and the first connector respectively.

3. The battery circuit breaker unit according to claim 2, characterized in that, The second conductive interface includes a second mounting hole penetrating the circuit board and a second current-carrying pad disposed in the second mounting hole, and the second current-carrying pad is provided with a second through hole for the second connector to pass through; when the second connector is inserted into the second through hole, the second current-carrying pad abuts against the second mounting hole and the second connector respectively.

4. A battery circuit breaker unit according to claim 3, characterized in that, The first current-carrying pad is welded to the first mounting hole, and the second current-carrying pad is welded to the second mounting hole.

5. A battery circuit breaker unit according to claim 3, characterized in that, The first current-carrying pad and the second current-carrying pad have the same structure, both including a first connecting part and a second connecting part, wherein the diameter of the first connecting part is smaller than the diameter of the first mounting hole and the second mounting hole, and the diameter of the second connecting part is larger than the diameter of the first mounting hole and the second mounting hole.

6. A battery circuit breaker unit according to claim 5, characterized in that, The circuit board is also provided with a number of through-holes, which are located above the second connecting part and arranged circumferentially around the center line of the second connecting part.

7. A battery circuit breaker unit according to claim 3, characterized in that, The first connector passes through the first through hole and is detachably connected to the circuit board via a first locking nut. The second connector passes through the second through hole and is detachably connected to the circuit board via a second locking nut.

8. A battery circuit breaker unit according to claim 7, characterized in that, An upper washer is provided between the first locking nut and the first current-carrying washer, and between the second locking nut and the second current-carrying washer. A lower washer is provided between the first current-carrying washer and the relay, and between the second current-carrying washer and the relay.

9. A battery circuit breaker unit according to claim 1, characterized in that, An avoidance groove is provided between the first conductive interface and the second conductive interface, and the avoidance groove passes through the circuit board.

10. A battery pack, characterized in that, The device includes a housing, and the housing contains a battery circuit breaker unit as described in any one of claims 1 to 9.

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