A battery pack circuit breaker unit and battery pack for a relay vertical installation

Abstract

The application discloses a battery pack circuit breaking unit and a battery pack, wherein the main relay is a relay core without a shell; the relay core is an integrated structure assembled together by a contact part and a magnetic circuit part in a distribution mode that the contact part is on the top and the magnetic circuit part is on the bottom; the main relay is installed in the shell in an inverted mode; the side of the shell is further integrated with a 2-core high-voltage plug-in part to connect the positive and negative poles in the shell; both the high-voltage sampling loop and the low-voltage control loop adopt small copper bars, which are integrated on the shell. The application has the advantages of simple structure and low cost, the relay is installed in an inverted mode to prevent the battery pack circuit breaking unit from causing the condensation of the upper shell to drop on the conductive end of the relay in an environment with large temperature difference, thus causing the failure of the relay, and the adapter copper bar and locking bolt between the battery pack circuit breaking unit and the 2-core high-voltage plug-in part are cancelled, so that the cost is reduced and the temperature rise pressure of the battery pack circuit breaking unit is reduced.

Description

[0001] This application is a divisional application of the invention patent entitled "A Relay Vertically Mounted Battery Pack Circuit Breaker Unit", application number: 202410162078.7, with the parent application date being: February 5, 2024. Technical Field

[0002] This invention relates to the field of relay technology, and in particular to a vertically mounted battery pack circuit breaker unit and battery pack. Background Technology

[0003] A BDU (Battery Disconnect Unit) is a battery pack disconnect unit specifically designed for the inside of a battery pack and is also a type of distribution box. As a protective battery module within the electric vehicle battery box, the BDU is a safety solution for electric vehicle lithium batteries and a crucial protection module for the high-voltage circuit system of an electric vehicle. It is an important component of the vehicle's overall control system, coordinating the functional conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery management system, charging management system, DC / DC converter, electric air conditioning, electric power steering, and braking system. Existing battery pack disconnect units typically use relays with enclosed housings. Installing these relays within the battery pack disconnect unit results in a large size, significant space occupation, and high manufacturing costs due to the need for adhesive dispensing technology. Existing housingless relay designs within the battery pack disconnect unit are complex, costly, and have upward-facing contacts. In environments with large temperature differences, condensation on the upper housing can drip onto the relay's conductive terminals, causing relay failure. Furthermore, the 2-core high-voltage connector is usually mounted on the aluminum shell of the battery pack, requiring a copper busbar to connect to the BDU. This increases the cost of the copper busbar and locking bolts between the BDU and the 2-core high-voltage connector. In addition, the copper busbar and locking points increase the internal resistance of the circuit. When the BDU is working, the heat generated at this location is high, thereby increasing the temperature rise pressure of the BDU and the battery pack. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery pack circuit breaker unit and battery pack with a vertically mounted relay. The structure is simple and the cost is low. By installing the relay upside down, it is possible to prevent condensation from dripping from the upper shell of the battery pack circuit breaker unit onto the conductive end of the relay in environments with large temperature differences, which would cause the relay to fail. Furthermore, the elimination of the adapter copper busbar and locking bolt between the battery pack circuit breaker unit and the 2-core high-voltage plug reduces costs and the temperature rise pressure of the battery pack circuit breaker unit.

[0005] The technical solution adopted by this invention to solve its technical problem is: a battery pack circuit breaker unit with a vertically mounted relay, comprising a housing, electronic components installed inside the housing, and a high-voltage sampling circuit and a low-voltage control circuit connecting the corresponding electronic components. The electronic components include a main relay; the main relay is a relay core without a housing; the relay core is an integral structure assembled from a contact portion and a magnetic circuit portion with the contact portion on top and the magnetic circuit portion on the bottom; the main relay is installed in the housing in an inverted manner; a two-core high-voltage plug is also integrated on the side of the housing to connect the positive and negative terminals inside the housing; both the high-voltage sampling circuit and the low-voltage control circuit use small copper busbars, which are integrated on the housing.

[0006] The housing includes a top cover and a box body. The top cover has a downward-opening receiving groove. The bottom of the relay core is fitted into the receiving groove of the top cover and fixed to the top cover. The contact portion of the head of the relay core has two outwardly protruding stationary contact terminals. The stationary contact terminals are fixed to a copper busbar by bolts to realize the connection between the relay and the high-voltage circuit. The bolts connected to the main relay also fix the box body together, thereby realizing the fixation between the top cover, the relay core and the box body.

[0007] An elastic buffer pad made of rubber, silicone, or elastic plastic is also provided between the inner side of the top surface of the top cover and the bottom of the relay core; a matching buckle is also provided between the side wall of the top cover and the side of the relay core. When the relay is fixed to the top cover, the buckle is used to press the elastic buffer pad against the bottom of the top cover and the relay core.

[0008] The small copper busbars of the high-voltage sampling circuit and the low-voltage control circuit are integrated into the upper cover by injection molding. A mating terminal is provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit. The mating terminal is connected to the corresponding small copper busbar. The upper cover is integrally molded into a connector box and together with the corresponding small copper busbar to form a sampling output connector and a low-voltage output connector.

[0009] The electronic components also include a precharge relay, a precharge resistor, a fuse, and a shunt; the precharge relay, precharge resistor, fuse, and shunt are installed in the housing in an inverted manner; the main circuit copper busbars for connecting the electronic components are distributed on the bottom inner side of the housing.

[0010] The main relay includes a main positive relay and a main negative relay. A copper busbar connected to one contact of each of the main positive relay and the main negative relay bends upward from the bottom of the housing and connects to a 2-core high-voltage plug on the side.

[0011] The two-core high-voltage plug is fixed to the side of the upper cover.

[0012] The main circuit copper busbar is integrated into the bottom of the box body by injection molding.

[0013] The main circuit copper busbar is partially exposed on the bottom surface of the box. An insulating film is also attached to the exposed copper busbar. A thermal pad for contacting the battery pack water cooling plate is attached under the insulating film to reduce the product temperature rise.

[0014] The bottom of the box is also provided with a heat-conducting ceramic plate for heat dissipation, which is sandwiched between two heat-conducting pads.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention employs a main relay with a shell-less relay core. The relay core is an integral structure assembled from contact parts and magnetic circuit parts, with the contact parts on top and the magnetic circuit parts on the bottom. The main relay is installed in the shell in an inverted manner. A two-core high-voltage connector is integrated on the side of the shell to connect to the positive and negative terminals inside the shell. Both the high-voltage sampling circuit and the low-voltage control circuit use small copper busbars integrated on the shell. This structure eliminates the relay shell, reducing the number of parts used, the weight and cost of the relay, and helps the relay dissipate heat better. Furthermore, the inverted installation of the relay, with the conductive end located at the bottom of the shell, prevents condensation from dripping from the upper shell onto the conductive end of the relay in environments with large temperature differences, thus preventing relay failure. This invention also eliminates the connecting copper busbar and locking bolts between the battery pack circuit breaker unit and the 2-core high-voltage connector, further reducing costs. Due to the reduction in the number of connecting copper busbars and locking points, the internal resistance of the circuit decreases, reducing heat generation at this location when the battery pack circuit breaker unit is operating, thereby reducing the temperature rise pressure on both the battery pack circuit breaker unit and the battery pack. Simultaneously, the adoption of a wireless design enables automated assembly, improving production efficiency.

[0017] 2. This invention employs an elastic buffer pad made of rubber, silicone, or elastic plastic between the inner top surface of the upper cover and the bottom of the relay core; a matching buckle is also provided between the side wall of the upper cover and the side of the relay core. When the relay is fixed to the upper cover, the buckle provides an interference fit, pressing the elastic buffer pad against the bottom of the upper cover and the relay core. This structure of the invention, through the structural design of the injection-molded part, achieves the fixing and clamping of the shell-less relay at minimal cost. Furthermore, the use of an elastic pad between the upper cover and the relay core not only compresses the shell-less relay but also absorbs a certain amount of vibration and impact energy, protecting the relay core.

[0018] 3. In this invention, the small copper busbars of both the high-voltage sampling circuit and the low-voltage control circuit are integrated into the upper cover via injection molding. A mating terminal is also provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit. This mating terminal connects to the corresponding small copper busbar. The upper cover is integrally molded into a connector box, which together with the corresponding small copper busbar forms the sampling output connector and the low-voltage output connector. This structure of the invention achieves a wiring harness-free design, making the overall assembly of the battery pack circuit breaker unit simpler, thereby enabling automated assembly and increasing production efficiency.

[0019] 4. In this invention, the main circuit copper busbar is partially exposed on the bottom surface of the housing. An insulating film is adhered to the exposed copper busbar location, and a thermally conductive pad for contact with the battery pack water-cooling plate is adhered underneath the insulating film to reduce product temperature rise. The bottom of the housing also has a thermally conductive ceramic plate for heat dissipation, sandwiched between two thermally conductive pads. This structure directly conducts heat from the main circuit copper busbar to the outside of the battery pack circuit breaker unit, aiding in heat dissipation. Furthermore, the thermally conductive ceramic plate is insulating, preventing current from escaping from the main circuit copper busbar to the outside of the battery pack circuit breaker unit, thus avoiding the risk of electric shock.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the relay-mounted vertical battery pack circuit breaker unit of the present invention is not limited to the embodiments. Attached Figure Description

[0021] Figure 1 This is an exploded view of the present invention;

[0022] Figure 2 This is the front view of the present invention;

[0023] Figure 3 This is a cross-sectional view of the present invention;

[0024] Figure 4 This is a cross-sectional view of the top cover of the present invention;

[0025] Figure 5 yes Figure 4 Enlarged view of point A;

[0026] Figure 6 yes Figure 4 Enlarged view of point B;

[0027] Figure 7 This is a top view of the high-voltage sampling circuit and the low-voltage control circuit of the present invention. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Example

[0035] See Figures 1 to 7 As shown, a battery pack circuit breaker unit with a vertically mounted relay according to the present invention includes a housing 4, electronic components installed inside the housing 4, and a high-voltage sampling circuit 6 and a low-voltage control circuit 7 connecting the corresponding electronic components. The electronic components include a main relay; the main relay is a relay core without a housing; the relay core is an integral structure assembled from a contact portion and a magnetic circuit portion with the contact portion on top and the magnetic circuit portion on the bottom; the main relay is installed in the housing in an inverted manner. Specifically, the main relay includes a main positive relay 2 and a main negative relay 3, both of which are relay cores without housings. The main positive relay 2 is assembled from a contact portion 21 and a magnetic circuit portion 22, and the main negative relay 3 is assembled from a contact portion 31 and a magnetic circuit portion 32; a two-core high-voltage plug 1 is also integrated on the side of the housing 4 to connect the positive and negative terminals inside the housing 4; both the high-voltage sampling circuit 6 and the low-voltage control circuit 7 use small copper busbars, which are integrated on the housing 4.

[0036] In this embodiment, the housing 4 includes an upper cover 41 and a box body 42. The upper cover 41 has a downward-opening receiving groove 411. The bottom of the relay core is fitted into the receiving groove 411 of the upper cover 41 and fixed to the upper cover 41. The contact portion of the head of the relay core has two outwardly protruding stationary contact terminals. The stationary contact terminals are fixed to the copper busbar 5 by bolts 8 to realize the connection between the relay and the high-voltage circuit. The bolts 8 connected to the main relay also fix the box body 42 together, thereby realizing the fixation between the upper cover 41, the relay core and the box body 42. Specifically, the contact portion 21 of the main positive relay 2 has two outwardly protruding stationary contact terminals 211, and the contact portion 31 of the main negative relay 3 has two outwardly protruding stationary contact terminals 311. The stationary contact terminals 211 and 311 are fixed to the copper busbar 5 by bolts 8 to realize the connection between the relay and the high-voltage circuit.

[0037] In this embodiment, an elastic buffer pad 15 made of rubber, silicone, or elastic plastic is also provided between the inner side of the top surface of the upper cover 41 and the bottom of the relay core; a matching buckle 412 is also provided between the side wall of the upper cover 41 and the side of the relay core. When the relay is fixed to the upper cover 41, the buckle 412 is used to press the elastic buffer pad 15 against the bottom of the upper cover 41 and the relay core through interference fit.

[0038] In this embodiment, the small copper busbars of the high-voltage sampling circuit 6 and the low-voltage control circuit 7 are integrated into the upper cover 41 by injection molding. A mating terminal 16 is also provided at the connection point of the high-voltage sampling circuit 6 and the low-voltage control circuit 7. The mating terminal 16 is connected to the corresponding small copper busbar. The upper cover 41 is integrally formed into a connector box and forms a sampling output connector 61 and a low-voltage output connector 71 with the corresponding small copper busbar.

[0039] In this embodiment, the electronic device further includes a precharge relay 9, a precharge resistor 10, a fuse 11, and a shunt 12; the precharge relay 9, the precharge resistor 10, the fuse 11, and the shunt 12 are respectively installed in the housing 42 in an inverted manner; the main circuit copper busbar 5 for connecting the electronic devices is distributed on the bottom inner side of the housing 42.

[0040] In this embodiment, the copper busbar 5 connecting one contact of each of the main positive relay 2 and the main negative relay 3 bends upward from the bottom of the housing 42 and connects to the 2-core high-voltage plug-in 1 on the side. The 2-core high-voltage plug-in 1 is fixed to the side of the upper cover 41.

[0041] In this embodiment, the main circuit copper busbar 5 is integrated into the bottom of the housing 42 by injection molding. Later, cooling components such as a water-cooling plate can be placed at the bottom of the battery pack circuit breaker unit to effectively reduce the temperature of the battery pack circuit breaker unit and ensure its safety.

[0042] In this embodiment, the main circuit copper busbar 5 is partially exposed on the bottom surface of the housing 42. An insulating film is attached to the exposed copper busbar of the housing 42, and a thermally conductive pad for contacting the battery pack water-cooling plate is attached underneath the insulating film to reduce the product temperature rise. The bottom of the housing 42 is also provided with a thermally conductive ceramic plate for heat dissipation, which is sandwiched between two thermally conductive pads.

[0043] In this embodiment, an insulating sealing gasket 17 is connected to each of the two stationary contact terminals 211 of the main positive relay 2 and the two stationary contact terminals 311 of the main negative relay 3, in order to increase the electrical clearance between the two stationary contact terminals.

[0044] In this embodiment, the upper cover 41 is provided with a slot 413, and the box body 42 is provided with a protrusion 421. The upper cover 41 and the box body 42 are connected by a snap-fit, which strengthens the fixation between the upper cover 41, the relay core and the box body 42.

[0045] The present invention provides a battery pack circuit breaker unit with a vertically mounted relay. The main relay and part of the copper busbar 5 are first installed on the top cover 41. Then, the pre-charge relay 9, pre-charge resistor 10, fuse 11, shunt 12 and housing 42 are installed. Finally, the two parts are assembled together. Bolts 8 are used to lock the stationary contact terminal of the main relay to the housing 42, so that the top cover 41, the main relay and the housing 42 are firmly fastened together.

[0046] This invention discloses a vertically mounted battery pack circuit breaker unit with a main relay that is a casing-less relay core. The relay core is an integral structure assembled from a contact portion and a magnetic circuit portion, with the contact portion on top and the magnetic circuit portion on the bottom. The main relay is mounted inverted within the housing 4. A two-core high-voltage connector 1 is integrated on the side of the housing 4 to connect to the positive and negative terminals inside the housing 4. Both the high-voltage sampling circuit 6 and the low-voltage control circuit 7 use small copper busbars integrated on the housing 4. This structure eliminates the relay casing, reducing the number of parts used, the weight and cost of the relay, and helps the relay dissipate heat better. Furthermore, the inverted mounting of the relay, with the conductive end located at the bottom of the housing, prevents condensation from dripping from the upper housing onto the conductive end of the relay in environments with large temperature differences, thus preventing relay failure. This invention also eliminates the connecting copper busbar and locking bolts between the battery pack circuit breaker unit and the 2-core high-voltage connector, further reducing costs. Due to the reduction in the number of connecting copper busbars and locking points, the internal resistance of the circuit decreases, reducing heat generation at this location when the battery pack circuit breaker unit is operating, thereby reducing the temperature rise pressure on both the battery pack circuit breaker unit and the battery pack. Simultaneously, the adoption of a wireless design enables automated assembly, improving production efficiency.

[0047] This invention discloses a battery pack circuit breaker unit with a vertically mounted relay. An elastic buffer pad 15, made of rubber, silicone, or elastic plastic, is placed between the inner top surface of the upper cover 41 and the bottom of the relay core. A matching buckle 412 is also provided between the side wall of the upper cover 41 and the side of the relay core. When the relay is fixed to the upper cover, the buckle 412 provides an interference fit, pressing the elastic buffer pad 15 against the bottom of the upper cover 41 and the relay core. This structure, through the design of the injection-molded part, achieves the fixing and clamping of the shell-less relay at minimal cost. Furthermore, the use of an elastic pad between the upper cover and the relay core not only compresses the shell-less relay but also absorbs some vibration and impact energy, protecting the relay core.

[0048] This invention discloses a vertically mounted battery pack circuit breaker unit with a relay. The high-voltage sampling circuit 6 and the low-voltage control circuit 7 are both integrated into the upper cover 41 via injection molding. A mating terminal 16 is provided at the connection point of the high-voltage sampling circuit 6 and the low-voltage control circuit 7. The mating terminal 16 connects to the corresponding small copper busbar. The upper cover 41 is integrally molded with a connector box, forming a sampling output connector 61 and a low-voltage output connector 71 with the corresponding small copper busbar. This structure of the invention achieves a wiring harness-free design, simplifying the overall assembly of the battery pack circuit breaker unit and enabling automated assembly, thus increasing production efficiency.

[0049] This invention discloses a vertically mounted battery pack circuit breaker unit for a relay. The main circuit copper busbar 5 is partially exposed on the bottom surface of the housing 42. An insulating film is adhered to the exposed copper busbar location on the housing 42, and a thermally conductive pad for contact with the battery pack water-cooling plate is adhered beneath the insulating film to reduce product temperature rise. A thermally conductive ceramic plate for heat dissipation is also provided at the bottom of the housing 42, sandwiched between two thermally conductive pads. This structure directly conducts heat from the main circuit copper busbar to the outside of the battery pack circuit breaker unit, aiding in heat dissipation. Furthermore, the thermally conductive ceramic plate is insulating, preventing current from escaping from the main circuit copper busbar to the outside of the battery pack circuit breaker unit, thus preventing electric shock risk.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A battery pack circuit breaker unit, comprising a housing and electronic components mounted within the housing, the electronic components including a relay; characterized in that: The relay is a relay core without a casing; the relay core includes a contact part and a magnetic circuit part, and the contact part is provided with two stationary contact terminals; The housing is provided with a receiving groove, and the relay core is installed in the receiving groove.

2. The battery pack circuit breaker unit according to claim 1, characterized in that: The magnetic circuit portion is fixed to the receiving groove, and the stationary contact terminal protrudes outward.

3. The battery pack circuit breaker unit according to claim 1, characterized in that: The contact portion and the magnetic circuit portion are arranged in an up-down distribution manner; along the up-down direction, an elastic buffer pad is also provided between the receiving groove and the magnetic circuit portion.

4. The battery pack circuit breaker unit according to claim 1, characterized in that: The side wall of the receiving groove and the side of the relay core are also provided with mutually compatible buckles.

5. The battery pack circuit breaker unit according to any one of claims 1-4, characterized in that: The contact portion and the magnetic circuit portion are arranged in an up-down distribution manner; the relay is installed in the receiving groove in an inverted manner, and the stationary contact terminal protrudes outward and is electrically connected to the copper busbar located at the bottom of the housing.

6. The battery pack circuit breaker unit according to any one of claims 1-4, characterized in that: It also includes a high-voltage sampling circuit and a low-voltage control circuit that connect to the corresponding electronic devices, both of which are integrated on the housing.

7. The battery pack circuit breaker unit according to claim 6, characterized in that: Both the high-voltage sampling circuit and the low-voltage control circuit use small copper busbars, which are integrated into the housing through injection molding.

8. The battery pack circuit breaker unit according to claim 6, characterized in that: A plug-in terminal is provided at the connection point of the high-voltage sampling circuit and the low-voltage control circuit, and the plug-in terminal is connected to the corresponding small copper busbar.

9. The battery pack circuit breaker unit according to claim 6, characterized in that: The housing includes a top cover, which is integrally formed into a connector box and connected to a corresponding small copper busbar to form a sampling output connector and a low-voltage output connector.

10. The battery pack circuit breaker unit according to claim 5, characterized in that: The side of the housing also integrates a 2-core high-voltage plug-in to connect the positive and negative terminals inside the housing; the relay includes a main positive relay and a main negative relay, the housing includes a box body, and the copper busbars connected to one contact of each of the main positive relay and the main negative relay bend upward from the bottom of the box body and connect to the 2-core high-voltage plug-in on the side.

11. The battery pack circuit breaker unit according to claim 5, characterized in that: The housing includes a box body, and the copper busbar is integrated into the bottom of the box body by injection molding.

12. The battery pack circuit breaker unit according to claim 11, characterized in that: The copper busbar is partially exposed on the bottom surface of the box body. An insulating film is also attached to the exposed copper busbar position on the box body, and a thermal pad for contacting the battery pack water cooling plate is attached under the insulating film.

13. The battery pack circuit breaker unit according to claim 12, characterized in that: The bottom of the box is also provided with a heat-conducting ceramic plate for heat dissipation, which is sandwiched between two heat-conducting pads.

14. A battery pack, characterized in that, The battery pack includes the battery pack circuit breaker unit as described in any one of claims 1-13.

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